1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 /* Functions for handling string expansion. */
17 # include "macro_predef.h"
20 typedef unsigned esi_flags;
22 #define ESI_BRACE_ENDS BIT(0) /* expansion should stop at } */
23 #define ESI_HONOR_DOLLAR BIT(1) /* $ is meaningfull */
24 #define ESI_SKIPPING BIT(2) /* value will not be needed */
25 #define ESI_EXISTS_ONLY BIT(3) /* actual value not needed */
28 # ifndef SUPPORT_CRYPTEQ
29 # define SUPPORT_CRYPTEQ
31 #endif /*!STAND_ALONE*/
34 # include "lookups/ldap.h"
37 #ifdef SUPPORT_CRYPTEQ
42 extern char* crypt16(char*, char*);
46 /* The handling of crypt16() is a mess. I will record below the analysis of the
47 mess that was sent to me. We decided, however, to make changing this very low
48 priority, because in practice people are moving away from the crypt()
49 algorithms nowadays, so it doesn't seem worth it.
52 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
53 the first 8 characters of the password using a 20-round version of crypt
54 (standard crypt does 25 rounds). It then crypts the next 8 characters,
55 or an empty block if the password is less than 9 characters, using a
56 20-round version of crypt and the same salt as was used for the first
57 block. Characters after the first 16 are ignored. It always generates
58 a 16-byte hash, which is expressed together with the salt as a string
59 of 24 base 64 digits. Here are some links to peruse:
61 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
62 http://seclists.org/bugtraq/1999/Mar/0076.html
64 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
65 and OSF/1. This is the same as the standard crypt if given a password
66 of 8 characters or less. If given more, it first does the same as crypt
67 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
68 using as salt the first two base 64 digits from the first hash block.
69 If the password is more than 16 characters then it crypts the 17th to 24th
70 characters using as salt the first two base 64 digits from the second hash
71 block. And so on: I've seen references to it cutting off the password at
72 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
74 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
75 http://seclists.org/bugtraq/1999/Mar/0109.html
76 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
77 TET1_html/sec.c222.html#no_id_208
79 Exim has something it calls "crypt16". It will either use a native
80 crypt16 or its own implementation. A native crypt16 will presumably
81 be the one that I called "crypt16" above. The internal "crypt16"
82 function, however, is a two-block-maximum implementation of what I called
83 "bigcrypt". The documentation matches the internal code.
85 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
86 that crypt16 and bigcrypt were different things.
88 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
89 to whatever it is using under that name. This unfortunately sets a
90 precedent for using "{crypt16}" to identify two incompatible algorithms
91 whose output can't be distinguished. With "{crypt16}" thus rendered
92 ambiguous, I suggest you deprecate it and invent two new identifiers
93 for the two algorithms.
95 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
96 of the password separately means they can be cracked separately, so
97 the double-length hash only doubles the cracking effort instead of
98 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
105 /*************************************************
106 * Local statics and tables *
107 *************************************************/
109 /* Table of item names, and corresponding switch numbers. The names must be in
110 alphabetical order. */
112 static uschar *item_table[] = {
182 /* Tables of operator names, and corresponding switch numbers. The names must be
183 in alphabetical order. There are two tables, because underscore is used in some
184 cases to introduce arguments, whereas for other it is part of the name. This is
185 an historical mis-design. */
187 static uschar * op_table_underscore[] = {
190 US"quote_local_part",
195 ,US"utf8_domain_from_alabel",
196 US"utf8_domain_to_alabel",
197 US"utf8_localpart_from_alabel",
198 US"utf8_localpart_to_alabel"
205 EOP_QUOTE_LOCAL_PART,
210 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
211 EOP_UTF8_DOMAIN_TO_ALABEL,
212 EOP_UTF8_LOCALPART_FROM_ALABEL,
213 EOP_UTF8_LOCALPART_TO_ALABEL
217 static uschar *op_table_main[] = {
268 EOP_ADDRESS = nelem(op_table_underscore),
318 /* Table of condition names, and corresponding switch numbers. The names must
319 be in alphabetical order. */
321 static uschar *cond_table[] = {
325 US"==", /* Backward compatibility */
365 US"match_local_part",
390 ECOND_FIRST_DELIVERY,
418 ECOND_MATCH_LOCAL_PART,
428 /* Types of table entry */
431 vtype_int, /* value is address of int */
432 vtype_filter_int, /* ditto, but recognized only when filtering */
433 vtype_ino, /* value is address of ino_t (not always an int) */
434 vtype_uid, /* value is address of uid_t (not always an int) */
435 vtype_gid, /* value is address of gid_t (not always an int) */
436 vtype_bool, /* value is address of bool */
437 vtype_stringptr, /* value is address of pointer to string */
438 vtype_msgbody, /* as stringptr, but read when first required */
439 vtype_msgbody_end, /* ditto, the end of the message */
440 vtype_msgheaders, /* the message's headers, processed */
441 vtype_msgheaders_raw, /* the message's headers, unprocessed */
442 vtype_localpart, /* extract local part from string */
443 vtype_domain, /* extract domain from string */
444 vtype_string_func, /* value is string returned by given function */
445 vtype_todbsdin, /* value not used; generate BSD inbox tod */
446 vtype_tode, /* value not used; generate tod in epoch format */
447 vtype_todel, /* value not used; generate tod in epoch/usec format */
448 vtype_todf, /* value not used; generate full tod */
449 vtype_todl, /* value not used; generate log tod */
450 vtype_todlf, /* value not used; generate log file datestamp tod */
451 vtype_todzone, /* value not used; generate time zone only */
452 vtype_todzulu, /* value not used; generate zulu tod */
453 vtype_reply, /* value not used; get reply from headers */
454 vtype_pid, /* value not used; result is pid */
455 vtype_host_lookup, /* value not used; get host name */
456 vtype_load_avg, /* value not used; result is int from os_getloadavg */
457 vtype_pspace, /* partition space; value is T/F for spool/log */
458 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
459 vtype_cert /* SSL certificate */
461 ,vtype_dkim /* Lookup of value in DKIM signature */
465 /* Type for main variable table */
473 /* Type for entries pointing to address/length pairs. Not currently
481 typedef uschar * stringptr_fn_t(void);
482 static uschar * fn_recipients(void);
483 static uschar * fn_recipients_list(void);
484 static uschar * fn_queue_size(void);
486 /* This table must be kept in alphabetical order. */
488 static var_entry var_table[] = {
489 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
490 they will be confused with user-creatable ACL variables. */
491 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
492 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
493 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
494 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
495 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
496 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
497 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
498 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
499 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
500 { "acl_narg", vtype_int, &acl_narg },
501 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
502 { "address_data", vtype_stringptr, &deliver_address_data },
503 { "address_file", vtype_stringptr, &address_file },
504 { "address_pipe", vtype_stringptr, &address_pipe },
505 #ifdef EXPERIMENTAL_ARC
506 { "arc_domains", vtype_string_func, (void *) &fn_arc_domains },
507 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
508 { "arc_state", vtype_stringptr, &arc_state },
509 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
511 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
512 { "authenticated_id", vtype_stringptr, &authenticated_id },
513 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
514 { "authentication_failed",vtype_int, &authentication_failed },
515 #ifdef WITH_CONTENT_SCAN
516 { "av_failed", vtype_int, &av_failed },
518 #ifdef EXPERIMENTAL_BRIGHTMAIL
519 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
520 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
521 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
522 { "bmi_deliver", vtype_int, &bmi_deliver },
524 { "body_linecount", vtype_int, &body_linecount },
525 { "body_zerocount", vtype_int, &body_zerocount },
526 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
527 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
528 { "caller_gid", vtype_gid, &real_gid },
529 { "caller_uid", vtype_uid, &real_uid },
530 { "callout_address", vtype_stringptr, &callout_address },
531 { "compile_date", vtype_stringptr, &version_date },
532 { "compile_number", vtype_stringptr, &version_cnumber },
533 { "config_dir", vtype_stringptr, &config_main_directory },
534 { "config_file", vtype_stringptr, &config_main_filename },
535 { "connection_id", vtype_stringptr, &connection_id },
536 { "csa_status", vtype_stringptr, &csa_status },
537 #ifdef EXPERIMENTAL_DCC
538 { "dcc_header", vtype_stringptr, &dcc_header },
539 { "dcc_result", vtype_stringptr, &dcc_result },
542 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
543 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
544 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
545 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
546 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
547 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
548 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
549 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
550 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
551 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
552 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
553 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
554 { "dkim_key_length", vtype_int, &dkim_key_length },
555 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
556 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
557 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
558 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
559 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
560 { "dkim_signers", vtype_stringptr, &dkim_signers },
561 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
562 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
565 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
566 { "dmarc_status", vtype_stringptr, &dmarc_status },
567 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
568 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
570 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
571 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
572 { "dnslist_text", vtype_stringptr, &dnslist_text },
573 { "dnslist_value", vtype_stringptr, &dnslist_value },
574 { "domain", vtype_stringptr, &deliver_domain },
575 { "domain_data", vtype_stringptr, &deliver_domain_data },
576 #ifndef DISABLE_EVENT
577 { "event_data", vtype_stringptr, &event_data },
579 /*XXX want to use generic vars for as many of these as possible*/
580 { "event_defer_errno", vtype_int, &event_defer_errno },
582 { "event_name", vtype_stringptr, &event_name },
584 { "exim_gid", vtype_gid, &exim_gid },
585 { "exim_path", vtype_stringptr, &exim_path },
586 { "exim_uid", vtype_uid, &exim_uid },
587 { "exim_version", vtype_stringptr, &version_string },
588 { "headers_added", vtype_string_func, (void *) &fn_hdrs_added },
589 { "home", vtype_stringptr, &deliver_home },
590 { "host", vtype_stringptr, &deliver_host },
591 { "host_address", vtype_stringptr, &deliver_host_address },
592 { "host_data", vtype_stringptr, &host_data },
593 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
594 { "host_lookup_failed", vtype_int, &host_lookup_failed },
595 { "host_port", vtype_int, &deliver_host_port },
596 { "initial_cwd", vtype_stringptr, &initial_cwd },
597 { "inode", vtype_ino, &deliver_inode },
598 { "interface_address", vtype_stringptr, &interface_address },
599 { "interface_port", vtype_int, &interface_port },
600 { "item", vtype_stringptr, &iterate_item },
602 { "ldap_dn", vtype_stringptr, &eldap_dn },
604 { "load_average", vtype_load_avg, NULL },
605 { "local_part", vtype_stringptr, &deliver_localpart },
606 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
607 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
608 { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v },
609 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
610 { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v },
611 #ifdef HAVE_LOCAL_SCAN
612 { "local_scan_data", vtype_stringptr, &local_scan_data },
614 { "local_user_gid", vtype_gid, &local_user_gid },
615 { "local_user_uid", vtype_uid, &local_user_uid },
616 { "localhost_number", vtype_int, &host_number },
617 { "log_inodes", vtype_pinodes, (void *)FALSE },
618 { "log_space", vtype_pspace, (void *)FALSE },
619 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
620 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
621 #ifdef WITH_CONTENT_SCAN
622 { "malware_name", vtype_stringptr, &malware_name },
624 { "max_received_linelength", vtype_int, &max_received_linelength },
625 { "message_age", vtype_int, &message_age },
626 { "message_body", vtype_msgbody, &message_body },
627 { "message_body_end", vtype_msgbody_end, &message_body_end },
628 { "message_body_size", vtype_int, &message_body_size },
629 { "message_exim_id", vtype_stringptr, &message_id },
630 { "message_headers", vtype_msgheaders, NULL },
631 { "message_headers_raw", vtype_msgheaders_raw, NULL },
632 { "message_id", vtype_stringptr, &message_id },
633 { "message_linecount", vtype_int, &message_linecount },
634 { "message_size", vtype_int, &message_size },
636 { "message_smtputf8", vtype_bool, &message_smtputf8 },
638 #ifdef WITH_CONTENT_SCAN
639 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
640 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
641 { "mime_boundary", vtype_stringptr, &mime_boundary },
642 { "mime_charset", vtype_stringptr, &mime_charset },
643 { "mime_content_description", vtype_stringptr, &mime_content_description },
644 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
645 { "mime_content_id", vtype_stringptr, &mime_content_id },
646 { "mime_content_size", vtype_int, &mime_content_size },
647 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
648 { "mime_content_type", vtype_stringptr, &mime_content_type },
649 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
650 { "mime_filename", vtype_stringptr, &mime_filename },
651 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
652 { "mime_is_multipart", vtype_int, &mime_is_multipart },
653 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
654 { "mime_part_count", vtype_int, &mime_part_count },
656 { "n0", vtype_filter_int, &filter_n[0] },
657 { "n1", vtype_filter_int, &filter_n[1] },
658 { "n2", vtype_filter_int, &filter_n[2] },
659 { "n3", vtype_filter_int, &filter_n[3] },
660 { "n4", vtype_filter_int, &filter_n[4] },
661 { "n5", vtype_filter_int, &filter_n[5] },
662 { "n6", vtype_filter_int, &filter_n[6] },
663 { "n7", vtype_filter_int, &filter_n[7] },
664 { "n8", vtype_filter_int, &filter_n[8] },
665 { "n9", vtype_filter_int, &filter_n[9] },
666 { "original_domain", vtype_stringptr, &deliver_domain_orig },
667 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
668 { "originator_gid", vtype_gid, &originator_gid },
669 { "originator_uid", vtype_uid, &originator_uid },
670 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
671 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
672 { "pid", vtype_pid, NULL },
674 { "prdr_requested", vtype_bool, &prdr_requested },
676 { "primary_hostname", vtype_stringptr, &primary_hostname },
677 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
678 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
679 { "proxy_external_port", vtype_int, &proxy_external_port },
680 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
681 { "proxy_local_port", vtype_int, &proxy_local_port },
682 { "proxy_session", vtype_bool, &proxy_session },
684 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
685 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
686 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
687 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
688 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
689 { "queue_name", vtype_stringptr, &queue_name },
690 { "queue_size", vtype_string_func, (void *) &fn_queue_size },
691 { "rcpt_count", vtype_int, &rcpt_count },
692 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
693 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
694 { "received_count", vtype_int, &received_count },
695 { "received_for", vtype_stringptr, &received_for },
696 { "received_ip_address", vtype_stringptr, &interface_address },
697 { "received_port", vtype_int, &interface_port },
698 { "received_protocol", vtype_stringptr, &received_protocol },
699 { "received_time", vtype_int, &received_time.tv_sec },
700 { "recipient_data", vtype_stringptr, &recipient_data },
701 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
702 { "recipients", vtype_string_func, (void *) &fn_recipients },
703 { "recipients_count", vtype_int, &recipients_count },
704 { "recipients_list", vtype_string_func, (void *) &fn_recipients_list },
705 { "regex_cachesize", vtype_int, ®ex_cachesize },/* undocumented; devel observability */
706 #ifdef WITH_CONTENT_SCAN
707 { "regex_match_string", vtype_stringptr, ®ex_match_string },
709 { "reply_address", vtype_reply, NULL },
710 { "return_path", vtype_stringptr, &return_path },
711 { "return_size_limit", vtype_int, &bounce_return_size_limit },
712 { "router_name", vtype_stringptr, &router_name },
713 { "runrc", vtype_int, &runrc },
714 { "self_hostname", vtype_stringptr, &self_hostname },
715 { "sender_address", vtype_stringptr, &sender_address },
716 { "sender_address_data", vtype_stringptr, &sender_address_data },
717 { "sender_address_domain", vtype_domain, &sender_address },
718 { "sender_address_local_part", vtype_localpart, &sender_address },
719 { "sender_data", vtype_stringptr, &sender_data },
720 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
721 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
722 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
723 { "sender_helo_verified",vtype_string_func, (void *) &sender_helo_verified_boolstr },
724 { "sender_host_address", vtype_stringptr, &sender_host_address },
725 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
726 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
727 { "sender_host_name", vtype_host_lookup, NULL },
728 { "sender_host_port", vtype_int, &sender_host_port },
729 { "sender_ident", vtype_stringptr, &sender_ident },
730 { "sender_rate", vtype_stringptr, &sender_rate },
731 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
732 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
733 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
734 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
735 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
736 { "sending_port", vtype_int, &sending_port },
737 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
738 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
739 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
740 { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist },
741 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
742 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
743 { "sn0", vtype_filter_int, &filter_sn[0] },
744 { "sn1", vtype_filter_int, &filter_sn[1] },
745 { "sn2", vtype_filter_int, &filter_sn[2] },
746 { "sn3", vtype_filter_int, &filter_sn[3] },
747 { "sn4", vtype_filter_int, &filter_sn[4] },
748 { "sn5", vtype_filter_int, &filter_sn[5] },
749 { "sn6", vtype_filter_int, &filter_sn[6] },
750 { "sn7", vtype_filter_int, &filter_sn[7] },
751 { "sn8", vtype_filter_int, &filter_sn[8] },
752 { "sn9", vtype_filter_int, &filter_sn[9] },
753 #ifdef WITH_CONTENT_SCAN
754 { "spam_action", vtype_stringptr, &spam_action },
755 { "spam_bar", vtype_stringptr, &spam_bar },
756 { "spam_report", vtype_stringptr, &spam_report },
757 { "spam_score", vtype_stringptr, &spam_score },
758 { "spam_score_int", vtype_stringptr, &spam_score_int },
761 { "spf_guess", vtype_stringptr, &spf_guess },
762 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
763 { "spf_received", vtype_stringptr, &spf_received },
764 { "spf_result", vtype_stringptr, &spf_result },
765 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
766 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
768 { "spool_directory", vtype_stringptr, &spool_directory },
769 { "spool_inodes", vtype_pinodes, (void *)TRUE },
770 { "spool_space", vtype_pspace, (void *)TRUE },
772 { "srs_recipient", vtype_stringptr, &srs_recipient },
774 { "thisaddress", vtype_stringptr, &filter_thisaddress },
776 /* The non-(in,out) variables are now deprecated */
777 { "tls_bits", vtype_int, &tls_in.bits },
778 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
779 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
781 { "tls_in_bits", vtype_int, &tls_in.bits },
782 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
783 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
784 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
785 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
786 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
787 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
788 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
789 #ifndef DISABLE_TLS_RESUME
790 { "tls_in_resumption", vtype_int, &tls_in.resumption },
793 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
795 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
796 { "tls_out_bits", vtype_int, &tls_out.bits },
797 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
798 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
799 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
801 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
803 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
804 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
805 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
806 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
807 #ifndef DISABLE_TLS_RESUME
808 { "tls_out_resumption", vtype_int, &tls_out.resumption },
811 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
814 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
816 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
818 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
820 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
823 { "tod_bsdinbox", vtype_todbsdin, NULL },
824 { "tod_epoch", vtype_tode, NULL },
825 { "tod_epoch_l", vtype_todel, NULL },
826 { "tod_full", vtype_todf, NULL },
827 { "tod_log", vtype_todl, NULL },
828 { "tod_logfile", vtype_todlf, NULL },
829 { "tod_zone", vtype_todzone, NULL },
830 { "tod_zulu", vtype_todzulu, NULL },
831 { "transport_name", vtype_stringptr, &transport_name },
832 { "value", vtype_stringptr, &lookup_value },
833 { "verify_mode", vtype_stringptr, &verify_mode },
834 { "version_number", vtype_stringptr, &version_string },
835 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
836 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
837 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
838 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
839 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
840 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
846 uschar * fn_arc_domains(void) {return NULL;}
847 uschar * fn_hdrs_added(void) {return NULL;}
848 uschar * fn_queue_size(void) {return NULL;}
849 uschar * fn_recipients(void) {return NULL;}
850 uschar * fn_recipients_list(void) {return NULL;}
851 uschar * sender_helo_verified_boolstr(void) {return NULL;}
852 uschar * smtp_cmd_hist(void) {return NULL;}
857 expansion_items(void)
860 for (int i = 0; i < nelem(item_table); i++)
862 spf(buf, sizeof(buf), CUS"_EXP_ITEM_%T", item_table[i]);
863 builtin_macro_create(buf);
867 expansion_operators(void)
870 for (int i = 0; i < nelem(op_table_underscore); i++)
872 spf(buf, sizeof(buf), CUS"_EXP_OP_%T", op_table_underscore[i]);
873 builtin_macro_create(buf);
875 for (int i = 0; i < nelem(op_table_main); i++)
877 spf(buf, sizeof(buf), CUS"_EXP_OP_%T", op_table_main[i]);
878 builtin_macro_create(buf);
882 expansion_conditions(void)
885 for (int i = 0; i < nelem(cond_table); i++)
887 spf(buf, sizeof(buf), CUS"_EXP_COND_%T", cond_table[i]);
888 builtin_macro_create(buf);
892 expansion_variables(void)
895 for (int i = 0; i < nelem(var_table); i++)
897 spf(buf, sizeof(buf), CUS"_EXP_VAR_%T", var_table[i].name);
898 builtin_macro_create(buf);
906 expansion_operators();
907 expansion_conditions();
908 expansion_variables();
911 #else /*!MACRO_PREDEF*/
913 static uschar var_buffer[256];
914 static BOOL malformed_header;
916 /* For textual hashes */
918 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
919 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
922 enum { HMAC_MD5, HMAC_SHA1 };
924 /* For numeric hashes */
926 static unsigned int prime[] = {
927 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
928 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
929 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
931 /* For printing modes in symbolic form */
933 static uschar *mtable_normal[] =
934 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
936 static uschar *mtable_setid[] =
937 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
939 static uschar *mtable_sticky[] =
940 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
942 /* flags for find_header() */
943 #define FH_EXISTS_ONLY BIT(0)
944 #define FH_WANT_RAW BIT(1)
945 #define FH_WANT_LIST BIT(2)
947 /* Recursively called function */
948 static uschar *expand_string_internal(const uschar *, esi_flags, const uschar **, BOOL *, BOOL *);
949 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
952 /*************************************************
953 * Tables for UTF-8 support *
954 *************************************************/
956 /* Table of the number of extra characters, indexed by the first character
957 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
960 static uschar utf8_table1[] = {
961 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
962 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
963 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
964 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
966 /* These are the masks for the data bits in the first byte of a character,
967 indexed by the number of additional bytes. */
969 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
971 /* Get the next UTF-8 character, advancing the pointer. */
973 #define GETUTF8INC(c, ptr) \
975 if ((c & 0xc0) == 0xc0) \
977 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
979 c = (c & utf8_table2[a]) << s; \
983 c |= (*ptr++ & 0x3f) << s; \
989 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
991 /*************************************************
992 * Binary chop search on a table *
993 *************************************************/
995 /* This is used for matching expansion items and operators.
998 name the name that is being sought
999 table the table to search
1000 table_size the number of items in the table
1002 Returns: the offset in the table, or -1
1006 chop_match(uschar *name, uschar **table, int table_size)
1008 uschar **bot = table;
1009 uschar **top = table + table_size;
1013 uschar **mid = bot + (top - bot)/2;
1014 int c = Ustrcmp(name, *mid);
1015 if (c == 0) return mid - table;
1016 if (c > 0) bot = mid + 1; else top = mid;
1024 /*************************************************
1025 * Check a condition string *
1026 *************************************************/
1028 /* This function is called to expand a string, and test the result for a "true"
1029 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
1030 forced fail or lookup defer.
1032 We used to release all store used, but this is not not safe due
1033 to ${dlfunc } and ${acl }. In any case expand_string_internal()
1034 is reasonably careful to release what it can.
1036 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
1039 condition the condition string
1040 m1 text to be incorporated in panic error
1043 Returns: TRUE if condition is met, FALSE if not
1047 expand_check_condition(const uschar * condition,
1048 const uschar * m1, const uschar * m2)
1050 const uschar * ss = expand_cstring(condition);
1053 if (!f.expand_string_forcedfail && !f.search_find_defer)
1054 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
1055 "for %s %s: %s", condition, m1, m2, expand_string_message);
1058 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
1059 strcmpic(ss, US"false") != 0;
1065 /*************************************************
1066 * Pseudo-random number generation *
1067 *************************************************/
1069 /* Pseudo-random number generation. The result is not "expected" to be
1070 cryptographically strong but not so weak that someone will shoot themselves
1071 in the foot using it as a nonce in some email header scheme or whatever
1072 weirdness they'll twist this into. The result should ideally handle fork().
1074 However, if we're stuck unable to provide this, then we'll fall back to
1075 appallingly bad randomness.
1077 If DISABLE_TLS is not defined then this will not be used except as an emergency
1082 Returns a random number in range [0, max-1]
1086 # define vaguely_random_number vaguely_random_number_fallback
1089 vaguely_random_number(int max)
1092 # undef vaguely_random_number
1094 static pid_t pid = 0;
1097 if ((p2 = getpid()) != pid)
1102 #ifdef HAVE_ARC4RANDOM
1103 /* cryptographically strong randomness, common on *BSD platforms, not
1104 so much elsewhere. Alas. */
1105 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1108 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1109 # ifdef HAVE_SRANDOMDEV
1110 /* uses random(4) for seeding */
1115 gettimeofday(&tv, NULL);
1116 srandom(tv.tv_sec | tv.tv_usec | getpid());
1120 /* Poor randomness and no seeding here */
1127 #ifdef HAVE_ARC4RANDOM
1128 return arc4random() % max;
1129 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1130 return random() % max;
1132 /* This one returns a 16-bit number, definitely not crypto-strong */
1133 return random_number(max);
1140 /*************************************************
1141 * Pick out a name from a string *
1142 *************************************************/
1144 /* If the name is too long, it is silently truncated.
1147 name points to a buffer into which to put the name
1148 max is the length of the buffer
1149 s points to the first alphabetic character of the name
1150 extras chars other than alphanumerics to permit
1152 Returns: pointer to the first character after the name
1154 Note: The test for *s != 0 in the while loop is necessary because
1155 Ustrchr() yields non-NULL if the character is zero (which is not something
1158 static const uschar *
1159 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1162 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1164 if (ptr < max-1) name[ptr++] = *s;
1173 /*************************************************
1174 * Pick out the rest of a header name *
1175 *************************************************/
1177 /* A variable name starting $header_ (or just $h_ for those who like
1178 abbreviations) might not be the complete header name because headers can
1179 contain any printing characters in their names, except ':'. This function is
1180 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1181 on the end, if the name was terminated by white space.
1184 name points to a buffer in which the name read so far exists
1185 max is the length of the buffer
1186 s points to the first character after the name so far, i.e. the
1187 first non-alphameric character after $header_xxxxx
1189 Returns: a pointer to the first character after the header name
1192 static const uschar *
1193 read_header_name(uschar *name, int max, const uschar *s)
1195 int prelen = Ustrchr(name, '_') - name + 1;
1196 int ptr = Ustrlen(name) - prelen;
1197 if (ptr > 0) memmove(name, name+prelen, ptr);
1198 while (mac_isgraph(*s) && *s != ':')
1200 if (ptr < max-1) name[ptr++] = *s;
1211 /*************************************************
1212 * Pick out a number from a string *
1213 *************************************************/
1216 n points to an integer into which to put the number
1217 s points to the first digit of the number
1219 Returns: a pointer to the character after the last digit
1221 /*XXX consider expanding to int_eximarith_t. But the test for
1222 "overbig numbers" in 0002 still needs to overflow it. */
1225 read_number(int *n, uschar *s)
1228 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1232 static const uschar *
1233 read_cnumber(int *n, const uschar *s)
1236 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1242 /*************************************************
1243 * Extract keyed subfield from a string *
1244 *************************************************/
1246 /* The yield is in dynamic store; NULL means that the key was not found.
1249 key points to the name of the key
1250 s points to the string from which to extract the subfield
1252 Returns: NULL if the subfield was not found, or
1253 a pointer to the subfield's data
1257 expand_getkeyed(const uschar * key, const uschar * s)
1259 int length = Ustrlen(key);
1260 Uskip_whitespace(&s);
1262 /* Loop to search for the key */
1268 const uschar * dkey = s;
1270 while (*s && *s != '=' && !isspace(*s)) s++;
1271 dkeylength = s - dkey;
1272 if (Uskip_whitespace(&s) == '=')
1273 while (isspace(*++s)) ;
1275 data = string_dequote(&s);
1276 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1279 Uskip_whitespace(&s);
1288 find_var_ent(uschar * name)
1291 int last = nelem(var_table);
1293 while (last > first)
1295 int middle = (first + last)/2;
1296 int c = Ustrcmp(name, var_table[middle].name);
1298 if (c > 0) { first = middle + 1; continue; }
1299 if (c < 0) { last = middle; continue; }
1300 return &var_table[middle];
1305 /*************************************************
1306 * Extract numbered subfield from string *
1307 *************************************************/
1309 /* Extracts a numbered field from a string that is divided by tokens - for
1310 example a line from /etc/passwd is divided by colon characters. First field is
1311 numbered one. Negative arguments count from the right. Zero returns the whole
1312 string. Returns NULL if there are insufficient tokens in the string
1315 Modifies final argument - this is a dynamically generated string, so that's OK.
1318 field number of field to be extracted,
1319 first field = 1, whole string = 0, last field = -1
1320 separators characters that are used to break string into tokens
1321 s points to the string from which to extract the subfield
1323 Returns: NULL if the field was not found,
1324 a pointer to the field's data inside s (modified to add 0)
1328 expand_gettokened (int field, uschar *separators, uschar *s)
1333 uschar *fieldtext = NULL;
1335 if (field == 0) return s;
1337 /* Break the line up into fields in place; for field > 0 we stop when we have
1338 done the number of fields we want. For field < 0 we continue till the end of
1339 the string, counting the number of fields. */
1341 count = (field > 0)? field : INT_MAX;
1347 /* Previous field was the last one in the string. For a positive field
1348 number, this means there are not enough fields. For a negative field number,
1349 check that there are enough, and scan back to find the one that is wanted. */
1353 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1354 if ((-field) == (INT_MAX - count - 1)) return s;
1358 while (ss[-1] != 0) ss--;
1364 /* Previous field was not last in the string; save its start and put a
1368 len = Ustrcspn(ss, separators);
1379 expand_getlistele(int field, const uschar * list)
1381 const uschar * tlist = list;
1383 /* Tainted mem for the throwaway element copies */
1384 uschar * dummy = store_get(2, GET_TAINTED);
1388 for (field++; string_nextinlist(&tlist, &sep, dummy, 1); ) field++;
1391 if (field == 0) return NULL;
1392 while (--field > 0 && (string_nextinlist(&list, &sep, dummy, 1))) ;
1393 return string_nextinlist(&list, &sep, NULL, 0);
1397 /* Certificate fields, by name. Worry about by-OID later */
1398 /* Names are chosen to not have common prefixes */
1405 uschar * (*getfn)(void * cert, uschar * mod);
1407 static certfield certfields[] =
1408 { /* linear search; no special order */
1409 { US"version", 7, &tls_cert_version },
1410 { US"serial_number", 13, &tls_cert_serial_number },
1411 { US"subject", 7, &tls_cert_subject },
1412 { US"notbefore", 9, &tls_cert_not_before },
1413 { US"notafter", 8, &tls_cert_not_after },
1414 { US"issuer", 6, &tls_cert_issuer },
1415 { US"signature", 9, &tls_cert_signature },
1416 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1417 { US"subj_altname", 12, &tls_cert_subject_altname },
1418 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1419 { US"crl_uri", 7, &tls_cert_crl_uri },
1423 expand_getcertele(uschar * field, uschar * certvar)
1427 if (!(vp = find_var_ent(certvar)))
1429 expand_string_message =
1430 string_sprintf("no variable named \"%s\"", certvar);
1431 return NULL; /* Unknown variable name */
1433 /* NB this stops us passing certs around in variable. Might
1434 want to do that in future */
1435 if (vp->type != vtype_cert)
1437 expand_string_message =
1438 string_sprintf("\"%s\" is not a certificate", certvar);
1439 return NULL; /* Unknown variable name */
1441 if (!*(void **)vp->value)
1444 if (*field >= '0' && *field <= '9')
1445 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1447 for (certfield * cp = certfields;
1448 cp < certfields + nelem(certfields);
1450 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1452 uschar * modifier = *(field += cp->namelen) == ','
1454 return (*cp->getfn)( *(void **)vp->value, modifier );
1457 expand_string_message =
1458 string_sprintf("bad field selector \"%s\" for certextract", field);
1461 #endif /*DISABLE_TLS*/
1463 /*************************************************
1464 * Extract a substring from a string *
1465 *************************************************/
1467 /* Perform the ${substr or ${length expansion operations.
1470 subject the input string
1471 value1 the offset from the start of the input string to the start of
1472 the output string; if negative, count from the right.
1473 value2 the length of the output string, or negative (-1) for unset
1474 if value1 is positive, unset means "all after"
1475 if value1 is negative, unset means "all before"
1476 len set to the length of the returned string
1478 Returns: pointer to the output string, or NULL if there is an error
1482 extract_substr(uschar *subject, int value1, int value2, int *len)
1484 int sublen = Ustrlen(subject);
1486 if (value1 < 0) /* count from right */
1490 /* If the position is before the start, skip to the start, and adjust the
1491 length. If the length ends up negative, the substring is null because nothing
1492 can precede. This falls out naturally when the length is unset, meaning "all
1498 if (value2 < 0) value2 = 0;
1502 /* Otherwise an unset length => characters before value1 */
1504 else if (value2 < 0)
1511 /* For a non-negative offset, if the starting position is past the end of the
1512 string, the result will be the null string. Otherwise, an unset length means
1513 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1517 if (value1 > sublen)
1522 else if (value2 < 0) value2 = sublen;
1525 /* Cut the length down to the maximum possible for the offset value, and get
1526 the required characters. */
1528 if (value1 + value2 > sublen) value2 = sublen - value1;
1530 return subject + value1;
1536 /*************************************************
1537 * Old-style hash of a string *
1538 *************************************************/
1540 /* Perform the ${hash expansion operation.
1543 subject the input string (an expanded substring)
1544 value1 the length of the output string; if greater or equal to the
1545 length of the input string, the input string is returned
1546 value2 the number of hash characters to use, or 26 if negative
1547 len set to the length of the returned string
1549 Returns: pointer to the output string, or NULL if there is an error
1553 compute_hash(uschar *subject, int value1, int value2, int *len)
1555 int sublen = Ustrlen(subject);
1557 if (value2 < 0) value2 = 26;
1558 else if (value2 > Ustrlen(hashcodes))
1560 expand_string_message =
1561 string_sprintf("hash count \"%d\" too big", value2);
1565 /* Calculate the hash text. We know it is shorter than the original string, so
1566 can safely place it in subject[] (we know that subject is always itself an
1567 expanded substring). */
1569 if (value1 < sublen)
1574 while ((c = (subject[j])) != 0)
1576 int shift = (c + j++) & 7;
1577 subject[i] ^= (c << shift) | (c >> (8-shift));
1578 if (++i >= value1) i = 0;
1580 for (i = 0; i < value1; i++)
1581 subject[i] = hashcodes[(subject[i]) % value2];
1583 else value1 = sublen;
1592 /*************************************************
1593 * Numeric hash of a string *
1594 *************************************************/
1596 /* Perform the ${nhash expansion operation. The first characters of the
1597 string are treated as most important, and get the highest prime numbers.
1600 subject the input string
1601 value1 the maximum value of the first part of the result
1602 value2 the maximum value of the second part of the result,
1603 or negative to produce only a one-part result
1604 len set to the length of the returned string
1606 Returns: pointer to the output string, or NULL if there is an error.
1610 compute_nhash (uschar *subject, int value1, int value2, int *len)
1612 uschar *s = subject;
1614 unsigned long int total = 0; /* no overflow */
1618 if (i == 0) i = nelem(prime) - 1;
1619 total += prime[i--] * (unsigned int)(*s++);
1622 /* If value2 is unset, just compute one number */
1625 s = string_sprintf("%lu", total % value1);
1627 /* Otherwise do a div/mod hash */
1631 total = total % (value1 * value2);
1632 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1643 /*************************************************
1644 * Find the value of a header or headers *
1645 *************************************************/
1647 /* Multiple instances of the same header get concatenated, and this function
1648 can also return a concatenation of all the header lines. When concatenating
1649 specific headers that contain lists of addresses, a comma is inserted between
1650 them. Otherwise we use a straight concatenation. Because some messages can have
1651 pathologically large number of lines, there is a limit on the length that is
1655 name the name of the header, without the leading $header_ or $h_,
1656 or NULL if a concatenation of all headers is required
1657 newsize return the size of memory block that was obtained; may be NULL
1658 if exists_only is TRUE
1659 flags FH_EXISTS_ONLY
1660 set if called from a def: test; don't need to build a string;
1661 just return a string that is not "" and not "0" if the header
1664 set if called for $rh_ or $rheader_ items; no processing,
1665 other than concatenating, will be done on the header. Also used
1666 for $message_headers_raw.
1668 Double colon chars in the content, and replace newline with
1669 colon between each element when concatenating; returning a
1670 colon-sep list (elements might contain newlines)
1671 charset name of charset to translate MIME words to; used only if
1672 want_raw is false; if NULL, no translation is done (this is
1673 used for $bh_ and $bheader_)
1675 Returns: NULL if the header does not exist, else a pointer to a new
1680 find_header(uschar * name, int * newsize, unsigned flags, const uschar * charset)
1683 int len = name ? Ustrlen(name) : 0;
1688 for (header_line * h = header_list; h; h = h->next)
1689 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1690 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1695 if (flags & FH_EXISTS_ONLY)
1696 return US"1"; /* don't need actual string */
1699 s = h->text + len; /* text to insert */
1700 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1701 Uskip_whitespace(&s); /* remove leading white space */
1702 t = h->text + h->slen; /* end-point */
1704 /* Unless wanted raw, remove trailing whitespace, including the
1707 if (flags & FH_WANT_LIST)
1708 while (t > s && t[-1] == '\n') t--;
1709 else if (!(flags & FH_WANT_RAW))
1711 while (t > s && isspace(t[-1])) t--;
1713 /* Set comma if handling a single header and it's one of those
1714 that contains an address list, except when asked for raw headers. Only
1715 need to do this once. */
1717 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1720 /* Trim the header roughly if we're approaching limits */
1722 if (gstring_length(g) + inc > header_insert_maxlen)
1723 inc = header_insert_maxlen - gstring_length(g);
1725 /* For raw just copy the data; for a list, add the data as a colon-sep
1726 list-element; for comma-list add as an unchecked comma,newline sep
1727 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1728 stripped trailing WS above including the newline). We ignore the potential
1729 expansion due to colon-doubling, just leaving the loop if the limit is met
1732 if (flags & FH_WANT_LIST)
1733 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1734 else if (flags & FH_WANT_RAW)
1735 g = string_catn(g, s, (unsigned)inc);
1737 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1740 if (gstring_length(g) >= header_insert_maxlen) break;
1743 if (!found) return NULL; /* No header found */
1744 if (!g) return US"";
1746 /* That's all we do for raw header expansion. */
1749 rawhdr = string_from_gstring(g);
1750 if (flags & FH_WANT_RAW)
1753 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1754 The rfc2047_decode2() function can return an error with decoded data if the
1755 charset translation fails. If decoding fails, it returns NULL. */
1759 uschar * error, * decoded = rfc2047_decode2(rawhdr,
1760 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1762 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1763 " input was: %s\n", error, rawhdr);
1764 return decoded ? decoded : rawhdr;
1771 /* Append a "local" element to an Authentication-Results: header
1772 if this was a non-smtp message.
1776 authres_local(gstring * g, const uschar * sysname)
1778 if (!f.authentication_local)
1780 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1781 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1786 /* Append an "iprev" element to an Authentication-Results: header
1787 if we have attempted to get the calling host's name.
1791 authres_iprev(gstring * g)
1793 if (sender_host_name)
1794 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1795 else if (host_lookup_deferred)
1796 g = string_cat(g, US";\n\tiprev=temperror");
1797 else if (host_lookup_failed)
1798 g = string_cat(g, US";\n\tiprev=fail");
1802 if (sender_host_address)
1803 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1809 /*************************************************
1810 * Return list of recipients *
1811 *************************************************/
1812 /* A recipients list is available only during system message filtering,
1813 during ACL processing after DATA, and while expanding pipe commands
1814 generated from a system filter, but not elsewhere. Note that this does
1815 not check for commas in the elements, and uses comma-space as seperator -
1816 so cannot be used as an exim list as-is. */
1823 if (!f.enable_dollar_recipients) return NULL;
1825 for (int i = 0; i < recipients_count; i++)
1827 const uschar * s = recipients_list[i].address;
1828 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1830 gstring_release_unused(g);
1831 return string_from_gstring(g);
1834 /* Similar, but as a properly-quoted exim list */
1838 fn_recipients_list(void)
1842 if (!f.enable_dollar_recipients) return NULL;
1844 for (int i = 0; i < recipients_count; i++)
1845 g = string_append_listele(g, ':', recipients_list[i].address);
1846 gstring_release_unused(g);
1847 return string_from_gstring(g);
1851 /*************************************************
1852 * Return size of queue *
1853 *************************************************/
1854 /* Ask the daemon for the queue size */
1859 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1863 const uschar * where;
1866 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1868 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1872 len = daemon_client_sockname(&sa_un, &sname);
1874 if (bind(fd, (const struct sockaddr *)&sa_un, (socklen_t)len) < 0)
1875 { where = US"bind"; goto bad; }
1878 debug_printf("local addr '%s%s'\n",
1879 *sa_un.sun_path ? "" : "@",
1880 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1883 len = daemon_notifier_sockname(&sa_un);
1884 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1885 { where = US"connect"; goto bad2; }
1887 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1888 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1890 if (poll_one_fd(fd, POLLIN, 2 * 1000) != 1)
1892 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1893 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1895 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1896 { where = US"recv"; goto bad2; }
1899 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1902 return string_copyn(buf, len);
1905 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1910 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1915 /*************************************************
1916 * Find value of a variable *
1917 *************************************************/
1919 /* The table of variables is kept in alphabetic order, so we can search it
1920 using a binary chop. The "choplen" variable is nothing to do with the binary
1924 name the name of the variable being sought
1926 exists_only TRUE if this is a def: test; passed on to find_header()
1927 skipping TRUE => skip any processing evaluation; this is not the same as
1928 exists_only because def: may test for values that are first
1930 newsize pointer to an int which is initially zero; if the answer is in
1931 a new memory buffer, *newsize is set to its size
1933 Returns: NULL if the variable does not exist, or
1934 a pointer to the variable's contents, or
1935 something non-NULL if exists_only is TRUE
1938 static const uschar *
1939 find_variable(uschar * name, esi_flags flags, int * newsize)
1946 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1947 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1948 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1949 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1950 (this gave backwards compatibility at the changeover). There may be built-in
1951 variables whose names start acl_ but they should never start in this way. This
1952 slightly messy specification is a consequence of the history, needless to say.
1954 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1955 set, in which case give an error. */
1957 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1961 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1962 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1964 else if (Ustrncmp(name, "r_", 2) == 0)
1966 tree_node * node = tree_search(router_var, name + 2);
1967 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1970 /* Handle $auth<n>, $regex<n> variables. */
1972 if (Ustrncmp(name, "auth", 4) == 0)
1975 int n = Ustrtoul(name + 4, &endptr, 10);
1976 if (!*endptr && n != 0 && n <= AUTH_VARS)
1977 return auth_vars[n-1] ? auth_vars[n-1] : US"";
1979 #ifdef WITH_CONTENT_SCAN
1980 else if (Ustrncmp(name, "regex", 5) == 0)
1983 int n = Ustrtoul(name + 5, &endptr, 10);
1984 if (!*endptr && n != 0 && n <= REGEX_VARS)
1985 return regex_vars[n-1] ? regex_vars[n-1] : US"";
1989 /* For all other variables, search the table */
1991 if (!(vp = find_var_ent(name)))
1992 return NULL; /* Unknown variable name */
1994 /* Found an existing variable. If in skipping state, the value isn't needed,
1995 and we want to avoid processing (such as looking up the host name). */
1997 if (flags & ESI_SKIPPING)
2003 case vtype_filter_int:
2004 if (!f.filter_running) return NULL;
2008 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
2012 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
2016 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
2020 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
2024 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
2027 case vtype_stringptr: /* Pointer to string */
2028 return (s = *((uschar **)(val))) ? s : US"";
2031 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
2034 case vtype_load_avg:
2035 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
2038 case vtype_host_lookup: /* Lookup if not done so */
2039 if ( !sender_host_name && sender_host_address
2040 && !host_lookup_failed && host_name_lookup() == OK)
2041 host_build_sender_fullhost();
2042 return sender_host_name ? sender_host_name : US"";
2044 case vtype_localpart: /* Get local part from address */
2045 if (!(s = *((uschar **)(val)))) return US"";
2046 if (!(domain = Ustrrchr(s, '@'))) return s;
2047 if (domain - s > sizeof(var_buffer) - 1)
2048 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
2049 " in string expansion", sizeof(var_buffer));
2050 return string_copyn(s, domain - s);
2052 case vtype_domain: /* Get domain from address */
2053 if (!(s = *((uschar **)(val)))) return US"";
2054 domain = Ustrrchr(s, '@');
2055 return domain ? domain + 1 : US"";
2057 case vtype_msgheaders:
2058 return find_header(NULL, newsize,
2059 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY : 0, NULL);
2061 case vtype_msgheaders_raw:
2062 return find_header(NULL, newsize,
2063 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2066 case vtype_msgbody: /* Pointer to msgbody string */
2067 case vtype_msgbody_end: /* Ditto, the end of the msg */
2068 ss = (uschar **)(val);
2069 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
2072 off_t start_offset_o = spool_data_start_offset(message_id);
2073 off_t start_offset = start_offset_o;
2074 int len = message_body_visible;
2076 if (len > message_size) len = message_size;
2077 *ss = body = store_get(len+1, GET_TAINTED);
2079 if (vp->type == vtype_msgbody_end)
2081 struct stat statbuf;
2082 if (fstat(deliver_datafile, &statbuf) == 0)
2084 start_offset = statbuf.st_size - len;
2085 if (start_offset < start_offset_o)
2086 start_offset = start_offset_o;
2089 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
2090 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
2092 if ((len = read(deliver_datafile, body, len)) > 0)
2095 if (message_body_newlines) /* Separate loops for efficiency */
2097 { if (body[--len] == 0) body[len] = ' '; }
2100 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
2103 return *ss ? *ss : US"";
2105 case vtype_todbsdin: /* BSD inbox time of day */
2106 return tod_stamp(tod_bsdin);
2108 case vtype_tode: /* Unix epoch time of day */
2109 return tod_stamp(tod_epoch);
2111 case vtype_todel: /* Unix epoch/usec time of day */
2112 return tod_stamp(tod_epoch_l);
2114 case vtype_todf: /* Full time of day */
2115 return tod_stamp(tod_full);
2117 case vtype_todl: /* Log format time of day */
2118 return tod_stamp(tod_log_bare); /* (without timezone) */
2120 case vtype_todzone: /* Time zone offset only */
2121 return tod_stamp(tod_zone);
2123 case vtype_todzulu: /* Zulu time */
2124 return tod_stamp(tod_zulu);
2126 case vtype_todlf: /* Log file datestamp tod */
2127 return tod_stamp(tod_log_datestamp_daily);
2129 case vtype_reply: /* Get reply address */
2130 s = find_header(US"reply-to:", newsize,
2131 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2133 if (s) Uskip_whitespace(&s);
2136 *newsize = 0; /* For the *s==0 case */
2137 s = find_header(US"from:", newsize,
2138 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2144 Uskip_whitespace(&s);
2145 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2146 while (t > s && isspace(t[-1])) t--;
2149 return s ? s : US"";
2151 case vtype_string_func:
2153 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2155 return s ? s : US"";
2161 sprintf(CS var_buffer, PR_EXIM_ARITH,
2162 receive_statvfs(val == (void *)TRUE, &inodes));
2169 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2170 sprintf(CS var_buffer, "%d", inodes);
2175 return *(void **)val ? US"<cert>" : US"";
2177 #ifndef DISABLE_DKIM
2179 return dkim_exim_expand_query((int)(long)val);
2184 return NULL; /* Unknown variable. Silences static checkers. */
2191 modify_variable(uschar *name, void * value)
2194 if ((vp = find_var_ent(name))) vp->value = value;
2195 return; /* Unknown variable name, fail silently */
2203 /*************************************************
2204 * Read and expand substrings *
2205 *************************************************/
2207 /* This function is called to read and expand argument substrings for various
2208 expansion items. Some have a minimum requirement that is less than the maximum;
2209 in these cases, the first non-present one is set to NULL.
2212 sub points to vector of pointers to set
2213 n maximum number of substrings
2215 sptr points to current string pointer
2217 skipping the skipping flag
2218 check_end if TRUE, check for final '}'
2219 name name of item, for error message
2220 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2222 textonly_p if not NULL, pointer to bitmask of which subs were text-only
2223 (did not change when expended)
2225 Returns: -1 OK; string pointer updated, but in "skipping" mode
2226 0 OK; string pointer updated
2227 1 curly bracketing error (too few arguments)
2228 2 too many arguments (only if check_end is set); message set
2229 3 other error (expansion failure)
2233 read_subs(uschar ** sub, int n, int m, const uschar ** sptr, esi_flags flags,
2234 BOOL check_end, uschar * name, BOOL * resetok, unsigned * textonly_p)
2236 const uschar * s = *sptr;
2237 unsigned textonly_l = 0;
2239 Uskip_whitespace(&s);
2240 for (int i = 0; i < n; i++)
2247 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2248 "(min is %d)", name, m);
2254 if (!(sub[i] = expand_string_internal(s+1,
2255 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags & ESI_SKIPPING, &s, resetok,
2256 textonly_p ? &textonly : NULL)))
2258 if (*s++ != '}') return 1;
2259 if (textonly_p && textonly) textonly_l |= BIT(i);
2260 Uskip_whitespace(&s);
2262 if (check_end && *s++ != '}')
2266 expand_string_message = string_sprintf("Too many arguments for '%s' "
2267 "(max is %d)", name, n);
2270 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2274 if (textonly_p) *textonly_p = textonly_l;
2276 return flags & ESI_SKIPPING ? -1 : 0;
2282 /*************************************************
2283 * Elaborate message for bad variable *
2284 *************************************************/
2286 /* For the "unknown variable" message, take a look at the variable's name, and
2287 give additional information about possible ACL variables. The extra information
2288 is added on to expand_string_message.
2290 Argument: the name of the variable
2295 check_variable_error_message(uschar *name)
2297 if (Ustrncmp(name, "acl_", 4) == 0)
2298 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2299 (name[4] == 'c' || name[4] == 'm')?
2301 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2302 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2304 US"user-defined ACL variables must start acl_c or acl_m");
2310 Load args from sub array to globals, and call acl_check().
2311 Sub array will be corrupted on return.
2313 Returns: OK access is granted by an ACCEPT verb
2314 DISCARD access is (apparently) granted by a DISCARD verb
2315 FAIL access is denied
2316 FAIL_DROP access is denied; drop the connection
2317 DEFER can't tell at the moment
2321 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2324 int sav_narg = acl_narg;
2326 uschar * dummy_logmsg;
2327 extern int acl_where;
2329 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2330 for (i = 0; i < nsub && sub[i+1]; i++)
2332 uschar * tmp = acl_arg[i];
2333 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2334 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2339 sub[i+1] = acl_arg[i];
2340 acl_arg[i++] = NULL;
2344 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2346 acl_narg>0 ? acl_arg[0] : US"<none>",
2347 acl_narg>1 ? " +more" : "");
2349 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2351 for (i = 0; i < nsub; i++)
2352 acl_arg[i] = sub[i+1]; /* restore old args */
2353 acl_narg = sav_narg;
2361 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2362 The given string is modified on return. Leading whitespace is skipped while
2363 looking for the opening wrap character, then the rest is scanned for the trailing
2364 (non-escaped) wrap character. A backslash in the string will act as an escape.
2366 A nul is written over the trailing wrap, and a pointer to the char after the
2367 leading wrap is returned.
2370 s String for de-wrapping
2371 wrap Two-char string, the first being the opener, second the closer wrapping
2374 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2378 dewrap(uschar * s, const uschar * wrap)
2382 BOOL quotesmode = wrap[0] == wrap[1];
2384 if (Uskip_whitespace(&p) == *wrap)
2390 if (*p == '\\') p++;
2391 else if (!quotesmode && *p == wrap[-1]) depth++;
2392 else if (*p == *wrap)
2403 expand_string_message = string_sprintf("missing '%c'", *wrap);
2408 /* Pull off the leading array or object element, returning
2409 a copy in an allocated string. Update the list pointer.
2411 The element may itself be an abject or array.
2412 Return NULL when the list is empty.
2416 json_nextinlist(const uschar ** list)
2418 unsigned array_depth = 0, object_depth = 0;
2419 BOOL quoted = FALSE;
2420 const uschar * s = *list, * item;
2422 skip_whitespace(&s);
2425 *s && (*s != ',' || array_depth != 0 || object_depth != 0 || quoted);
2427 if (!quoted) switch (*s)
2429 case '[': array_depth++; break;
2430 case ']': array_depth--; break;
2431 case '{': object_depth++; break;
2432 case '}': object_depth--; break;
2433 case '"': quoted = TRUE;
2437 case '\\': s++; break; /* backslash protects one char */
2438 case '"': quoted = FALSE; break;
2440 *list = *s ? s+1 : s;
2441 if (item == s) return NULL;
2442 item = string_copyn(item, s - item);
2443 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2449 /************************************************/
2450 /* Return offset in ops table, or -1 if not found.
2451 Repoint to just after the operator in the string.
2454 ss string representation of operator
2455 opname split-out operator name
2459 identify_operator(const uschar ** ss, uschar ** opname)
2461 const uschar * s = *ss;
2464 /* Numeric comparisons are symbolic */
2466 if (*s == '=' || *s == '>' || *s == '<')
2478 /* All other conditions are named */
2481 s = read_name(name, sizeof(name), s, US"_");
2484 /* If we haven't read a name, it means some non-alpha character is first. */
2488 expand_string_message = string_sprintf("condition name expected, "
2489 "but found \"%.16s\"", s);
2492 DEBUG(D_expand) debug_printf_indent("cond: %s\n", name);
2494 *opname = string_copy(name);
2496 return chop_match(name, cond_table, nelem(cond_table));
2500 /*************************************************
2501 * Handle MD5 or SHA-1 computation for HMAC *
2502 *************************************************/
2504 /* These are some wrapping functions that enable the HMAC code to be a bit
2505 cleaner. A good compiler will spot the tail recursion.
2508 type HMAC_MD5 or HMAC_SHA1
2509 remaining are as for the cryptographic hash functions
2515 chash_start(int type, void * base)
2517 if (type == HMAC_MD5)
2518 md5_start((md5 *)base);
2520 sha1_start((hctx *)base);
2524 chash_mid(int type, void * base, const uschar * string)
2526 if (type == HMAC_MD5)
2527 md5_mid((md5 *)base, string);
2529 sha1_mid((hctx *)base, string);
2533 chash_end(int type, void * base, const uschar * string, int length,
2536 if (type == HMAC_MD5)
2537 md5_end((md5 *)base, string, length, digest);
2539 sha1_end((hctx *)base, string, length, digest);
2546 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2547 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2550 key encoding key, nul-terminated
2551 src data to be hashed, nul-terminated
2553 len size of output buffer
2557 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2560 const uschar * keyptr;
2562 unsigned int keylen;
2564 #define MD5_HASHLEN 16
2565 #define MD5_HASHBLOCKLEN 64
2567 uschar keyhash[MD5_HASHLEN];
2568 uschar innerhash[MD5_HASHLEN];
2569 uschar finalhash[MD5_HASHLEN];
2570 uschar innerkey[MD5_HASHBLOCKLEN];
2571 uschar outerkey[MD5_HASHBLOCKLEN];
2574 keylen = Ustrlen(keyptr);
2576 /* If the key is longer than the hash block length, then hash the key
2579 if (keylen > MD5_HASHBLOCKLEN)
2581 chash_start(HMAC_MD5, &md5_base);
2582 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2584 keylen = MD5_HASHLEN;
2587 /* Now make the inner and outer key values */
2589 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2590 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2592 for (int i = 0; i < keylen; i++)
2594 innerkey[i] ^= keyptr[i];
2595 outerkey[i] ^= keyptr[i];
2598 /* Now do the hashes */
2600 chash_start(HMAC_MD5, &md5_base);
2601 chash_mid(HMAC_MD5, &md5_base, innerkey);
2602 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2604 chash_start(HMAC_MD5, &md5_base);
2605 chash_mid(HMAC_MD5, &md5_base, outerkey);
2606 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2608 /* Encode the final hash as a hex string, limited by output buffer size */
2611 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2613 if (j-- <= 0) break;
2614 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2615 if (j-- <= 0) break;
2616 *p++ = hex_digits[finalhash[i] & 0x0f];
2620 #endif /*SUPPORT_SRS*/
2623 /*************************************************
2624 * Read and evaluate a condition *
2625 *************************************************/
2629 s points to the start of the condition text
2630 resetok points to a BOOL which is written false if it is unsafe to
2631 free memory. Certain condition types (acl) may have side-effect
2632 allocation which must be preserved.
2633 yield points to a BOOL to hold the result of the condition test;
2634 if NULL, we are just reading through a condition that is
2635 part of an "or" combination to check syntax, or in a state
2636 where the answer isn't required
2638 Returns: a pointer to the first character after the condition, or
2642 static const uschar *
2643 eval_condition(const uschar * s, BOOL * resetok, BOOL * yield)
2645 BOOL testfor = TRUE, tempcond, combined_cond;
2647 BOOL sub2_honour_dollar = TRUE, is_forany, is_json, is_jsons;
2649 int_eximarith_t num[2];
2650 struct stat statbuf;
2653 const uschar * sub[10], * next;
2654 unsigned sub_textonly = 0;
2658 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2660 switch(cond_type = identify_operator(&s, &opname))
2662 /* def: tests for a non-empty variable, or for the existence of a header. If
2663 yield == NULL we are in a skipping state, and don't care about the answer. */
2671 expand_string_message = US"\":\" expected after \"def\"";
2675 s = read_name(name, sizeof(name), s+1, US"_");
2677 /* Test for a header's existence. If the name contains a closing brace
2678 character, this may be a user error where the terminating colon has been
2679 omitted. Set a flag to adjust a subsequent error message in this case. */
2681 if ( ( *(t = name) == 'h'
2682 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2684 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2687 s = read_header_name(name, sizeof(name), s);
2688 /* {-for-text-editors */
2689 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2691 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2694 /* Test for a variable's having a non-empty value. A non-existent variable
2695 causes an expansion failure. */
2699 if (!(t = find_variable(name,
2700 yield ? ESI_EXISTS_ONLY : ESI_EXISTS_ONLY | ESI_SKIPPING, NULL)))
2702 expand_string_message = name[0]
2703 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2704 : US"variable name omitted after \"def:\"";
2705 check_variable_error_message(name);
2708 if (yield) *yield = (t[0] != 0) == testfor;
2715 /* first_delivery tests for first delivery attempt */
2717 case ECOND_FIRST_DELIVERY:
2718 if (yield) *yield = f.deliver_firsttime == testfor;
2722 /* queue_running tests for any process started by a queue runner */
2724 case ECOND_QUEUE_RUNNING:
2725 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2729 /* exists: tests for file existence
2730 isip: tests for any IP address
2731 isip4: tests for an IPv4 address
2732 isip6: tests for an IPv6 address
2733 pam: does PAM authentication
2734 radius: does RADIUS authentication
2735 ldapauth: does LDAP authentication
2736 pwcheck: does Cyrus SASL pwcheck authentication
2745 case ECOND_LDAPAUTH:
2748 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2752 sub[0] = expand_string_internal(s+1,
2753 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yield ? ESI_NOFLAGS : ESI_SKIPPING),
2754 &s, resetok, &textonly);
2755 if (!sub[0]) goto failout;
2756 if (textonly) sub_textonly |= BIT(0);
2758 /* {-for-text-editors */
2759 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2761 if (!yield) { next = s; goto out; } /* No need to run the test if skipping */
2766 if ((expand_forbid & RDO_EXISTS) != 0)
2768 expand_string_message = US"File existence tests are not permitted";
2771 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2779 const uschar **errpp;
2780 DEBUG(D_expand) errpp = &errp; else errpp = 0;
2781 if (0 == (rc = string_is_ip_addressX(sub[0], NULL, errpp)))
2782 DEBUG(D_expand) debug_printf("failed: %s\n", errp);
2784 *yield = ( cond_type == ECOND_ISIP ? rc != 0 :
2785 cond_type == ECOND_ISIP4 ? rc == 4 : rc == 6) == testfor;
2790 /* Various authentication tests - all optionally compiled */
2794 rc = auth_call_pam(sub[0], &expand_string_message);
2797 goto COND_FAILED_NOT_COMPILED;
2798 #endif /* SUPPORT_PAM */
2801 #ifdef RADIUS_CONFIG_FILE
2802 rc = auth_call_radius(sub[0], &expand_string_message);
2805 goto COND_FAILED_NOT_COMPILED;
2806 #endif /* RADIUS_CONFIG_FILE */
2808 case ECOND_LDAPAUTH:
2811 /* Just to keep the interface the same */
2813 int old_pool = store_pool;
2814 store_pool = POOL_SEARCH;
2815 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2816 &expand_string_message, &do_cache);
2817 store_pool = old_pool;
2821 goto COND_FAILED_NOT_COMPILED;
2822 #endif /* LOOKUP_LDAP */
2825 #ifdef CYRUS_PWCHECK_SOCKET
2826 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2829 goto COND_FAILED_NOT_COMPILED;
2830 #endif /* CYRUS_PWCHECK_SOCKET */
2832 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2833 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2835 if (rc == ERROR || rc == DEFER) goto failout;
2836 *yield = (rc == OK) == testfor;
2842 /* call ACL (in a conditional context). Accept true, deny false.
2843 Defer is a forced-fail. Anything set by message= goes to $value.
2844 Up to ten parameters are used; we use the braces round the name+args
2845 like the saslauthd condition does, to permit a variable number of args.
2846 See also the expansion-item version EITEM_ACL and the traditional
2847 acl modifier ACLC_ACL.
2848 Since the ACL may allocate new global variables, tell our caller to not
2853 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2859 Uskip_whitespace(&s);
2860 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2862 switch(read_subs(sub, nelem(sub), 1, &s,
2863 yield ? ESI_NOFLAGS : ESI_SKIPPING, TRUE, name, resetok, NULL))
2865 case 1: expand_string_message = US"too few arguments or bracketing "
2868 case 3: goto failout;
2874 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2875 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2880 lookup_value = NULL;
2882 lookup_value = string_copy(user_msg);
2883 *yield = cond == testfor;
2887 f.expand_string_forcedfail = TRUE;
2890 expand_string_message = string_sprintf("%s from acl \"%s\"",
2891 rc_names[rc], sub[0]);
2899 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2901 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2903 However, the last two are optional. That is why the whole set is enclosed
2904 in their own set of braces. */
2906 case ECOND_SASLAUTHD:
2907 #ifndef CYRUS_SASLAUTHD_SOCKET
2908 goto COND_FAILED_NOT_COMPILED;
2912 Uskip_whitespace(&s);
2913 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2914 switch(read_subs(sub, nelem(sub), 2, &s,
2915 yield ? ESI_NOFLAGS : ESI_SKIPPING, TRUE, name, resetok, NULL))
2917 case 1: expand_string_message = US"too few arguments or bracketing "
2918 "error for saslauthd";
2920 case 3: goto failout;
2922 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2925 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2926 &expand_string_message);
2927 if (rc == ERROR || rc == DEFER) goto failout;
2928 *yield = (rc == OK) == testfor;
2932 #endif /* CYRUS_SASLAUTHD_SOCKET */
2935 /* symbolic operators for numeric and string comparison, and a number of
2936 other operators, all requiring two arguments.
2938 crypteq: encrypts plaintext and compares against an encrypted text,
2939 using crypt(), crypt16(), MD5 or SHA-1
2940 inlist/inlisti: checks if first argument is in the list of the second
2941 match: does a regular expression match and sets up the numerical
2942 variables if it succeeds
2943 match_address: matches in an address list
2944 match_domain: matches in a domain list
2945 match_ip: matches a host list that is restricted to IP addresses
2946 match_local_part: matches in a local part list
2949 case ECOND_MATCH_ADDRESS:
2950 case ECOND_MATCH_DOMAIN:
2951 case ECOND_MATCH_IP:
2952 case ECOND_MATCH_LOCAL_PART:
2953 #ifndef EXPAND_LISTMATCH_RHS
2954 sub2_honour_dollar = FALSE;
2963 case ECOND_NUM_L: /* Numerical comparisons */
2970 case ECOND_STR_LT: /* String comparisons */
2981 for (int i = 0; i < 2; i++)
2984 /* Sometimes, we don't expand substrings; too many insecure configurations
2985 created using match_address{}{} and friends, where the second param
2986 includes information from untrustworthy sources. */
2987 /*XXX is this moot given taint-tracking? */
2989 esi_flags flags = ESI_BRACE_ENDS;
2991 if (!(i > 0 && !sub2_honour_dollar)) flags |= ESI_HONOR_DOLLAR;
2992 if (!yield) flags |= ESI_SKIPPING;
2994 if (Uskip_whitespace(&s) != '{')
2996 if (i == 0) goto COND_FAILED_CURLY_START;
2997 expand_string_message = string_sprintf("missing 2nd string in {} "
2998 "after \"%s\"", opname);
3001 if (!(sub[i] = expand_string_internal(s+1, flags, &s, resetok, &textonly)))
3003 if (textonly) sub_textonly |= BIT(i);
3004 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
3005 debug_printf_indent("WARNING: the second arg is NOT expanded,"
3006 " for security reasons\n");
3007 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3009 /* Convert to numerical if required; we know that the names of all the
3010 conditions that compare numbers do not start with a letter. This just saves
3011 checking for them individually. */
3013 if (!isalpha(opname[0]) && yield)
3018 debug_printf_indent("empty string cast to zero for numerical comparison\n");
3022 num[i] = expanded_string_integer(sub[i], FALSE);
3023 if (expand_string_message) goto failout;
3027 /* Result not required */
3029 if (!yield) { next = s; goto out; }
3031 /* Do an appropriate comparison */
3037 tempcond = (num[0] == num[1]); break;
3040 tempcond = (num[0] > num[1]); break;
3043 tempcond = (num[0] >= num[1]); break;
3046 tempcond = (num[0] < num[1]); break;
3049 tempcond = (num[0] <= num[1]); break;
3052 tempcond = (Ustrcmp(sub[0], sub[1]) < 0); break;
3055 tempcond = (strcmpic(sub[0], sub[1]) < 0); break;
3058 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); break;
3061 tempcond = (strcmpic(sub[0], sub[1]) <= 0); break;
3064 tempcond = (Ustrcmp(sub[0], sub[1]) == 0); break;
3067 tempcond = (strcmpic(sub[0], sub[1]) == 0); break;
3070 tempcond = (Ustrcmp(sub[0], sub[1]) > 0); break;
3073 tempcond = (strcmpic(sub[0], sub[1]) > 0); break;
3076 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); break;
3079 tempcond = (strcmpic(sub[0], sub[1]) >= 0); break;
3081 case ECOND_MATCH: /* Regular expression match */
3083 const pcre2_code * re = regex_compile(sub[1],
3084 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
3085 &expand_string_message, pcre_gen_cmp_ctx);
3089 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
3093 case ECOND_MATCH_ADDRESS: /* Match in an address list */
3094 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0,
3095 CUSS &lookup_value);
3096 goto MATCHED_SOMETHING;
3098 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
3099 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
3100 MCL_DOMAIN + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3101 goto MATCHED_SOMETHING;
3103 case ECOND_MATCH_IP: /* Match IP address in a host list */
3104 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
3106 expand_string_message = string_sprintf("\"%s\" is not an IP address",
3112 unsigned int *nullcache = NULL;
3113 check_host_block cb;
3115 cb.host_name = US"";
3116 cb.host_address = sub[0];
3118 /* If the host address starts off ::ffff: it is an IPv6 address in
3119 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3122 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
3123 cb.host_address + 7 : cb.host_address;
3125 rc = match_check_list(
3126 &sub[1], /* the list */
3127 0, /* separator character */
3128 &hostlist_anchor, /* anchor pointer */
3129 &nullcache, /* cache pointer */
3130 check_host, /* function for testing */
3131 &cb, /* argument for function */
3132 MCL_HOST, /* type of check */
3133 sub[0], /* text for debugging */
3134 CUSS &lookup_value); /* where to pass back data */
3136 goto MATCHED_SOMETHING;
3138 case ECOND_MATCH_LOCAL_PART:
3139 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3140 MCL_LOCALPART + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3146 case OK: tempcond = TRUE; break;
3147 case FAIL: tempcond = FALSE; break;
3150 expand_string_message = string_sprintf("unable to complete match "
3151 "against \"%s\": %s", sub[1], search_error_message);
3157 /* Various "encrypted" comparisons. If the second string starts with
3158 "{" then an encryption type is given. Default to crypt() or crypt16()
3159 (build-time choice). */
3160 /* }-for-text-editors */
3163 #ifndef SUPPORT_CRYPTEQ
3164 goto COND_FAILED_NOT_COMPILED;
3166 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3168 int sublen = Ustrlen(sub[1]+5);
3173 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3175 /* If the length that we are comparing against is 24, the MD5 digest
3176 is expressed as a base64 string. This is the way LDAP does it. However,
3177 some other software uses a straightforward hex representation. We assume
3178 this if the length is 32. Other lengths fail. */
3182 uschar *coded = b64encode(CUS digest, 16);
3183 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3184 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3185 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3187 else if (sublen == 32)
3190 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3192 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3193 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3194 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3198 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3199 "fail\n crypted=%s\n", sub[1]+5);
3204 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3206 int sublen = Ustrlen(sub[1]+6);
3211 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3213 /* If the length that we are comparing against is 28, assume the SHA1
3214 digest is expressed as a base64 string. If the length is 40, assume a
3215 straightforward hex representation. Other lengths fail. */
3219 uschar *coded = b64encode(CUS digest, 20);
3220 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3221 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3222 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3224 else if (sublen == 40)
3227 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3229 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3230 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3231 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3235 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3236 "fail\n crypted=%s\n", sub[1]+6);
3241 else /* {crypt} or {crypt16} and non-{ at start */
3242 /* }-for-text-editors */
3247 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3252 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3257 else if (sub[1][0] == '{') /* }-for-text-editors */
3259 expand_string_message = string_sprintf("unknown encryption mechanism "
3260 "in \"%s\"", sub[1]);
3266 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3267 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3268 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3272 #define XSTR(s) STR(s)
3273 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3274 " subject=%s\n crypted=%s\n",
3275 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3280 /* If the encrypted string contains fewer than two characters (for the
3281 salt), force failure. Otherwise we get false positives: with an empty
3282 string the yield of crypt() is an empty string! */
3285 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3286 else if (errno == EINVAL)
3290 expand_string_message = string_sprintf("crypt error: %s\n",
3291 US strerror(errno));
3296 #endif /* SUPPORT_CRYPTEQ */
3301 const uschar * list = sub[1];
3303 uschar *save_iterate_item = iterate_item;
3304 int (*compare)(const uschar *, const uschar *);
3306 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3309 compare = cond_type == ECOND_INLISTI
3310 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3312 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3314 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3315 if (compare(sub[0], iterate_item) == 0)
3318 lookup_value = iterate_item;
3322 iterate_item = save_iterate_item;
3325 } /* Switch for comparison conditions */
3327 *yield = tempcond == testfor;
3328 next = s; goto out; /* End of comparison conditions */
3331 /* and/or: computes logical and/or of several conditions */
3335 subcondptr = (yield == NULL) ? NULL : &tempcond;
3336 combined_cond = (cond_type == ECOND_AND);
3338 Uskip_whitespace(&s);
3339 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3343 /* {-for-text-editors */
3344 if (Uskip_whitespace(&s) == '}') break;
3345 if (*s != '{') /* }-for-text-editors */
3347 expand_string_message = string_sprintf("each subcondition "
3348 "inside an \"%s{...}\" condition must be in its own {}", opname);
3352 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3354 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3355 expand_string_message, opname);
3358 Uskip_whitespace(&s);
3360 /* {-for-text-editors */
3363 /* {-for-text-editors */
3364 expand_string_message = string_sprintf("missing } at end of condition "
3365 "inside \"%s\" group", opname);
3370 if (cond_type == ECOND_AND)
3372 combined_cond &= tempcond;
3373 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3374 } /* evaluate any more */
3377 combined_cond |= tempcond;
3378 if (combined_cond) subcondptr = NULL; /* once true, don't */
3379 } /* evaluate any more */
3382 if (yield) *yield = (combined_cond == testfor);
3383 next = ++s; goto out;
3386 /* forall/forany: iterates a condition with different values */
3388 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3389 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3390 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3391 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3392 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3393 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3397 const uschar * list;
3399 uschar *save_iterate_item = iterate_item;
3401 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3403 Uskip_whitespace(&s);
3404 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3405 if (!(sub[0] = expand_string_internal(s,
3406 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yield ? ESI_NOFLAGS : ESI_SKIPPING),
3407 &s, resetok, NULL)))
3409 /* {-for-text-editors */
3410 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3412 Uskip_whitespace(&s);
3413 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3417 /* Call eval_condition once, with result discarded (as if scanning a
3418 "false" part). This allows us to find the end of the condition, because if
3419 the list it empty, we won't actually evaluate the condition for real. */
3421 if (!(s = eval_condition(sub[1], resetok, NULL)))
3423 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3424 expand_string_message, opname);
3427 Uskip_whitespace(&s);
3429 /* {-for-text-editors */
3432 /* {-for-text-editors */
3433 expand_string_message = string_sprintf("missing } at end of condition "
3434 "inside \"%s\"", opname);
3438 if (yield) *yield = !testfor;
3440 if (is_json) list = dewrap(string_copy(list), US"[]");
3441 while ((iterate_item = is_json
3442 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3445 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3447 expand_string_message =
3448 string_sprintf("%s wrapping string result for extract jsons",
3449 expand_string_message);
3450 iterate_item = save_iterate_item;
3454 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3455 if (!eval_condition(sub[1], resetok, &tempcond))
3457 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3458 expand_string_message, opname);
3459 iterate_item = save_iterate_item;
3462 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3463 tempcond? "true":"false");
3465 if (yield) *yield = (tempcond == testfor);
3466 if (tempcond == is_forany) break;
3469 iterate_item = save_iterate_item;
3474 /* The bool{} expansion condition maps a string to boolean.
3475 The values supported should match those supported by the ACL condition
3476 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3477 of true/false. Note that Router "condition" rules have a different
3478 interpretation, where general data can be used and only a few values
3480 Note that readconf.c boolean matching, for boolean configuration options,
3481 only matches true/yes/false/no.
3482 The bool_lax{} condition matches the Router logic, which is much more
3485 case ECOND_BOOL_LAX:
3491 BOOL boolvalue = FALSE;
3493 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3494 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3495 switch(read_subs(sub_arg, 1, 1, &s,
3496 yield ? ESI_NOFLAGS : ESI_SKIPPING, FALSE, ourname, resetok, NULL))
3498 case 1: expand_string_message = string_sprintf(
3499 "too few arguments or bracketing error for %s",
3503 case 3: goto failout;
3506 Uskip_whitespace(&t);
3507 if ((len = Ustrlen(t)))
3509 /* trailing whitespace: seems like a good idea to ignore it too */
3511 while (isspace(*t2)) t2--;
3512 if (t2 != (t + len))
3519 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3520 /* logic for the lax case from expand_check_condition(), which also does
3521 expands, and the logic is both short and stable enough that there should
3522 be no maintenance burden from replicating it. */
3526 ? Ustrspn(t+1, "0123456789") == len-1
3527 : Ustrspn(t, "0123456789") == len)
3529 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3530 /* expand_check_condition only does a literal string "0" check */
3531 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3534 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3536 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3538 else if (cond_type == ECOND_BOOL_LAX)
3542 expand_string_message = string_sprintf("unrecognised boolean "
3546 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3547 boolvalue? "true":"false");
3548 if (yield) *yield = (boolvalue == testfor);
3553 case ECOND_INBOUND_SRS:
3554 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3557 const pcre2_code * re;
3558 pcre2_match_data * md;
3562 BOOL boolvalue = FALSE;
3564 switch(read_subs(sub, 2, 2, CUSS &s,
3565 yield ? ESI_NOFLAGS : ESI_SKIPPING, FALSE, name, resetok, NULL))
3567 case 1: expand_string_message = US"too few arguments or bracketing "
3568 "error for inbound_srs";
3570 case 3: goto failout;
3573 /* Match the given local_part against the SRS-encoded pattern */
3575 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]{2})=([^=]*)=(.*)$",
3576 MCS_CASELESS | MCS_CACHEABLE, FALSE);
3577 md = pcre2_match_data_create(4+1, pcre_gen_ctx);
3578 if (pcre2_match(re, sub[0], PCRE2_ZERO_TERMINATED, 0, PCRE_EOPT,
3579 md, pcre_gen_mtc_ctx) < 0)
3581 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3584 ovec = pcre2_get_ovector_pointer(md);
3586 if (sub[0][0] == '"')
3588 else for (uschar * s = sub[0]; *s; s++)
3589 if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL)
3590 { quoting = 1; break; }
3592 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
3594 /* Record the (quoted, if needed) decoded recipient as $srs_recipient */
3596 srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */
3598 (int) (ovec[9]-ovec[8]), sub[0] + ovec[8], /* substr 4 */
3600 (int) (ovec[7]-ovec[6]), sub[0] + ovec[6]); /* substr 3 */
3602 /* If a zero-length secret was given, we're done. Otherwise carry on
3603 and validate the given SRS local_part againt our secret. */
3607 /* check the timestamp */
3610 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3614 gettimeofday(&now, NULL);
3615 now.tv_sec /= 86400; /* days since epoch */
3617 /* Decode substring 2 from base32 to a number */
3619 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3621 uschar * t = Ustrchr(base32_chars, *ss++);
3622 d = d * 32 + (t - base32_chars);
3625 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3627 DEBUG(D_expand) debug_printf("SRS too old\n");
3632 /* check length of substring 1, the offered checksum */
3634 if (ovec[3]-ovec[2] != 4)
3636 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3640 /* Hash the address with our secret, and compare that computed checksum
3641 with the one extracted from the arg */
3643 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3644 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3646 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3653 /* pcre2_match_data_free(md); gen ctx needs no free */
3654 if (yield) *yield = (boolvalue == testfor);
3657 #endif /*SUPPORT_SRS*/
3659 /* Unknown condition */
3662 if (!expand_string_message || !*expand_string_message)
3663 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3665 } /* End switch on condition type */
3667 /* Missing braces at start and end of data */
3669 COND_FAILED_CURLY_START:
3670 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3673 COND_FAILED_CURLY_END:
3674 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3678 /* A condition requires code that is not compiled */
3680 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3681 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3682 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3683 COND_FAILED_NOT_COMPILED:
3684 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3699 /*************************************************
3700 * Save numerical variables *
3701 *************************************************/
3703 /* This function is called from items such as "if" that want to preserve and
3704 restore the numbered variables.
3707 save_expand_string points to an array of pointers to set
3708 save_expand_nlength points to an array of ints for the lengths
3710 Returns: the value of expand max to save
3714 save_expand_strings(const uschar **save_expand_nstring, int *save_expand_nlength)
3716 for (int i = 0; i <= expand_nmax; i++)
3718 save_expand_nstring[i] = expand_nstring[i];
3719 save_expand_nlength[i] = expand_nlength[i];
3726 /*************************************************
3727 * Restore numerical variables *
3728 *************************************************/
3730 /* This function restored saved values of numerical strings.
3733 save_expand_nmax the number of strings to restore
3734 save_expand_string points to an array of pointers
3735 save_expand_nlength points to an array of ints
3741 restore_expand_strings(int save_expand_nmax, const uschar **save_expand_nstring,
3742 int *save_expand_nlength)
3744 expand_nmax = save_expand_nmax;
3745 for (int i = 0; i <= expand_nmax; i++)
3747 expand_nstring[i] = save_expand_nstring[i];
3748 expand_nlength[i] = save_expand_nlength[i];
3756 /*************************************************
3757 * Handle yes/no substrings *
3758 *************************************************/
3760 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3761 alternative substrings that depend on whether or not the condition was true,
3762 or the lookup or extraction succeeded. The substrings always have to be
3763 expanded, to check their syntax, but "skipping" is set when the result is not
3764 needed - this avoids unnecessary nested lookups.
3768 skipping TRUE if we were skipping when this item was reached
3769 yes TRUE if the first string is to be used, else use the second
3770 save_lookup a value to put back into lookup_value before the 2nd expansion
3771 sptr points to the input string pointer
3772 yieldptr points to the output growable-string pointer
3773 type "lookup", "if", "extract", "run", "env", "listextract" or
3774 "certextract" for error message
3775 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3778 Returns: 0 OK; lookup_value has been reset to save_lookup
3780 2 expansion failed because of bracketing error
3784 process_yesno(esi_flags flags, BOOL yes, uschar *save_lookup, const uschar **sptr,
3785 gstring ** yieldptr, uschar *type, BOOL *resetok)
3788 const uschar *s = *sptr; /* Local value */
3789 uschar *sub1, *sub2;
3790 const uschar * errwhere;
3792 flags &= ESI_SKIPPING; /* Ignore all buf the skipping flag */
3794 /* If there are no following strings, we substitute the contents of $value for
3795 lookups and for extractions in the success case. For the ${if item, the string
3796 "true" is substituted. In the fail case, nothing is substituted for all three
3799 if (skip_whitespace(&s) == '}')
3803 if (yes && !(flags & ESI_SKIPPING))
3804 *yieldptr = string_catn(*yieldptr, US"true", 4);
3808 if (yes && lookup_value && !(flags & ESI_SKIPPING))
3809 *yieldptr = string_cat(*yieldptr, lookup_value);
3810 lookup_value = save_lookup;
3816 /* The first following string must be braced. */
3820 errwhere = US"'yes' part did not start with '{'"; /*}}*/
3824 /* Expand the first substring. Forced failures are noticed only if we actually
3825 want this string. Set skipping in the call in the fail case (this will always
3826 be the case if we were already skipping). */
3828 sub1 = expand_string_internal(s,
3829 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yes ? ESI_NOFLAGS : ESI_SKIPPING),
3831 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3832 f.expand_string_forcedfail = FALSE;
3836 errwhere = US"'yes' part did not end with '}'";
3840 /* If we want the first string, add it to the output */
3843 *yieldptr = string_cat(*yieldptr, sub1);
3845 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3846 $value to what it was at the start of the item, so that it has this value
3847 during the second string expansion. For the call from "if" or "run" to this
3848 function, save_lookup is set to lookup_value, so that this statement does
3851 lookup_value = save_lookup;
3853 /* There now follows either another substring, or "fail", or nothing. This
3854 time, forced failures are noticed only if we want the second string. We must
3855 set skipping in the nested call if we don't want this string, or if we were
3856 already skipping. */
3858 if (skip_whitespace(&s) == '{') /*}*/
3860 esi_flags s_flags = ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags;
3861 if (yes) s_flags |= ESI_SKIPPING;
3862 sub2 = expand_string_internal(s+1, s_flags, &s, resetok, NULL);
3863 if (!sub2 && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3864 f.expand_string_forcedfail = FALSE; /*{*/
3867 errwhere = US"'no' part did not start with '{'"; /*}*/
3871 /* If we want the second string, add it to the output */
3874 *yieldptr = string_cat(*yieldptr, sub2);
3877 /* If there is no second string, but the word "fail" is present when the use of
3878 the second string is wanted, set a flag indicating it was a forced failure
3879 rather than a syntactic error. Swallow the terminating } in case this is nested
3880 inside another lookup or if or extract. */
3885 /* deconst cast ok here as source is s anyway */
3886 s = US read_name(name, sizeof(name), s, US"_");
3887 if (Ustrcmp(name, "fail") == 0)
3889 if (!yes && !(flags & ESI_SKIPPING))
3891 Uskip_whitespace(&s); /*{{*/
3894 errwhere = US"did not close with '}' after forcedfail";
3897 expand_string_message =
3898 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3899 f.expand_string_forcedfail = TRUE;
3905 expand_string_message =
3906 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3911 /* All we have to do now is to check on the final closing brace. */
3913 skip_whitespace(&s); /*{{*/
3916 errwhere = US"did not close with '}'";
3922 /* Update the input pointer value before returning */
3927 /* Get here if there is a bracketing failure */
3928 expand_string_message = string_sprintf(
3929 "curly-bracket problem in conditional yes/no parsing: %s\n"
3930 " remaining string is '%s'", errwhere, --s);
3935 /* Get here for other failures */
3943 /********************************************************
3944 * prvs: Get last three digits of days since Jan 1, 1970 *
3945 ********************************************************/
3947 /* This is needed to implement the "prvs" BATV reverse
3950 Argument: integer "days" offset to add or substract to
3951 or from the current number of days.
3953 Returns: pointer to string containing the last three
3954 digits of the number of days since Jan 1, 1970,
3955 modified by the offset argument, NULL if there
3956 was an error in the conversion.
3961 prvs_daystamp(int day_offset)
3963 uschar * days = store_get(32, GET_UNTAINTED); /* Need at least 24 for cases */
3964 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3965 (time(NULL) + day_offset*86400)/86400);
3966 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3971 /********************************************************
3972 * prvs: perform HMAC-SHA1 computation of prvs bits *
3973 ********************************************************/
3975 /* This is needed to implement the "prvs" BATV reverse
3979 address RFC2821 Address to use
3980 key The key to use (must be less than 64 characters
3982 key_num Single-digit key number to use. Defaults to
3985 Returns: pointer to string containing the first three
3986 bytes of the final hash in hex format, NULL if
3987 there was an error in the process.
3991 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3993 gstring * hash_source;
3996 uschar innerhash[20];
3997 uschar finalhash[20];
3998 uschar innerkey[64];
3999 uschar outerkey[64];
4000 uschar *finalhash_hex;
4005 if (Ustrlen(key) > 64)
4008 hash_source = string_catn(NULL, key_num, 1);
4009 hash_source = string_catn(hash_source, daystamp, 3);
4010 hash_source = string_cat(hash_source, address);
4013 debug_printf_indent("prvs: hash source is '%Y'\n", hash_source);
4015 memset(innerkey, 0x36, 64);
4016 memset(outerkey, 0x5c, 64);
4018 for (int i = 0; i < Ustrlen(key); i++)
4020 innerkey[i] ^= key[i];
4021 outerkey[i] ^= key[i];
4024 chash_start(HMAC_SHA1, &h);
4025 chash_mid(HMAC_SHA1, &h, innerkey);
4026 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
4028 chash_start(HMAC_SHA1, &h);
4029 chash_mid(HMAC_SHA1, &h, outerkey);
4030 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
4032 /* Hashing is deemed sufficient to de-taint any input data */
4034 p = finalhash_hex = store_get(40, GET_UNTAINTED);
4035 for (int i = 0; i < 3; i++)
4037 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
4038 *p++ = hex_digits[finalhash[i] & 0x0f];
4042 return finalhash_hex;
4048 /*************************************************
4049 * Join a file onto the output string *
4050 *************************************************/
4052 /* This is used for readfile/readsock and after a run expansion.
4053 It joins the contents of a file onto the output string, globally replacing
4054 newlines with a given string (optionally).
4058 yield pointer to the expandable string struct
4059 eol newline replacement string, or NULL
4061 Returns: new pointer for expandable string, terminated if non-null
4065 cat_file(FILE * f, gstring * yield, uschar * eol)
4067 uschar buffer[1024];
4069 while (Ufgets(buffer, sizeof(buffer), f))
4071 int len = Ustrlen(buffer);
4072 if (eol && buffer[len-1] == '\n') len--;
4073 yield = string_catn(yield, buffer, len);
4074 if (eol && buffer[len])
4075 yield = string_cat(yield, eol);
4083 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
4086 uschar buffer[1024];
4088 /*XXX could we read direct into a pre-grown string? */
4090 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
4091 for (uschar * s = buffer; rc--; s++)
4092 yield = eol && *s == '\n'
4093 ? string_cat(yield, eol) : string_catn(yield, s, 1);
4095 /* We assume that all errors, and any returns of zero bytes,
4096 are actually EOF. */
4103 /*************************************************
4104 * Evaluate numeric expression *
4105 *************************************************/
4107 /* This is a set of mutually recursive functions that evaluate an arithmetic
4108 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
4109 these functions that is called from elsewhere is eval_expr, whose interface is:
4112 sptr pointer to the pointer to the string - gets updated
4113 decimal TRUE if numbers are to be assumed decimal
4114 error pointer to where to put an error message - must be NULL on input
4115 endket TRUE if ')' must terminate - FALSE for external call
4117 Returns: on success: the value of the expression, with *error still NULL
4118 on failure: an undefined value, with *error = a message
4121 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
4124 static int_eximarith_t
4125 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
4128 int_eximarith_t x = eval_op_or(&s, decimal, error);
4133 *error = US"expecting closing parenthesis";
4135 while (isspace(*++s)) ;
4137 *error = US"expecting operator";
4143 static int_eximarith_t
4144 eval_number(uschar **sptr, BOOL decimal, uschar **error)
4150 if (isdigit((c = Uskip_whitespace(&s))))
4153 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4155 switch (tolower(*s))
4158 case 'k': n *= 1024; s++; break;
4159 case 'm': n *= 1024*1024; s++; break;
4160 case 'g': n *= 1024*1024*1024; s++; break;
4162 Uskip_whitespace(&s);
4167 n = eval_expr(&s, decimal, error, 1);
4171 *error = US"expecting number or opening parenthesis";
4179 static int_eximarith_t
4180 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4184 Uskip_whitespace(&s);
4185 if (*s == '+' || *s == '-' || *s == '~')
4188 x = eval_op_unary(&s, decimal, error);
4189 if (op == '-') x = -x;
4190 else if (op == '~') x = ~x;
4193 x = eval_number(&s, decimal, error);
4200 static int_eximarith_t
4201 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4204 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4207 while (*s == '*' || *s == '/' || *s == '%')
4210 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4212 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4213 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4214 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4215 * -N*M is INT_MIN will yield INT_MIN.
4216 * Since we don't support floating point, this is somewhat simpler.
4217 * Ideally, we'd return an error, but since we overflow for all other
4218 * arithmetic, consistency suggests otherwise, but what's the correct value
4219 * to use? There is none.
4220 * The C standard guarantees overflow for unsigned arithmetic but signed
4221 * overflow invokes undefined behaviour; in practice, this is overflow
4222 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4223 * that long/longlong larger than int are available, or we could just work
4224 * with larger types. We should consider whether to guarantee 32bit eval
4225 * and 64-bit working variables, with errors returned. For now ...
4226 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4227 * can just let the other invalid results occur otherwise, as they have
4228 * until now. For this one case, we can coerce.
4230 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4233 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4234 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4244 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4260 static int_eximarith_t
4261 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4264 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4267 while (*s == '+' || *s == '-')
4270 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4272 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4273 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4274 { /* over-conservative check */
4276 ? US"overflow in sum" : US"overflow in difference";
4279 if (op == '+') x += y; else x -= y;
4287 static int_eximarith_t
4288 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4291 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4294 while ((*s == '<' || *s == '>') && s[1] == s[0])
4299 y = eval_op_sum(&s, decimal, error);
4301 if (op == '<') x <<= y; else x >>= y;
4309 static int_eximarith_t
4310 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4313 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4320 y = eval_op_shift(&s, decimal, error);
4330 static int_eximarith_t
4331 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4334 int_eximarith_t x = eval_op_and(&s, decimal, error);
4341 y = eval_op_and(&s, decimal, error);
4351 static int_eximarith_t
4352 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4355 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4362 y = eval_op_xor(&s, decimal, error);
4373 /************************************************/
4374 /* Comparison operation for sort expansion. We need to avoid
4375 re-expanding the fields being compared, so need a custom routine.
4378 cond_type Comparison operator code
4379 leftarg, rightarg Arguments for comparison
4381 Return true iff (leftarg compare rightarg)
4385 sortsbefore(int cond_type, BOOL alpha_cond,
4386 const uschar * leftarg, const uschar * rightarg)
4388 int_eximarith_t l_num, r_num;
4392 l_num = expanded_string_integer(leftarg, FALSE);
4393 if (expand_string_message) return FALSE;
4394 r_num = expanded_string_integer(rightarg, FALSE);
4395 if (expand_string_message) return FALSE;
4399 case ECOND_NUM_G: return l_num > r_num;
4400 case ECOND_NUM_GE: return l_num >= r_num;
4401 case ECOND_NUM_L: return l_num < r_num;
4402 case ECOND_NUM_LE: return l_num <= r_num;
4409 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4410 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4411 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4412 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4413 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4414 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4415 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4416 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4419 return FALSE; /* should not happen */
4423 /* Expand a named list. Return false on failure. */
4425 expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype)
4427 tree_node *t = NULL;
4428 const uschar * list;
4431 BOOL needsep = FALSE;
4432 #define LISTNAMED_BUF_SIZE 256
4433 uschar b[LISTNAMED_BUF_SIZE];
4434 uschar * buffer = b;
4436 if (*name == '+') name++;
4437 if (!listtype) /* no-argument version */
4439 if ( !(t = tree_search(addresslist_anchor, name))
4440 && !(t = tree_search(domainlist_anchor, name))
4441 && !(t = tree_search(hostlist_anchor, name)))
4442 t = tree_search(localpartlist_anchor, name);
4444 else switch(*listtype) /* specific list-type version */
4446 case 'a': t = tree_search(addresslist_anchor, name); break;
4447 case 'd': t = tree_search(domainlist_anchor, name); break;
4448 case 'h': t = tree_search(hostlist_anchor, name); break;
4449 case 'l': t = tree_search(localpartlist_anchor, name); break;
4451 expand_string_message = US"bad suffix on \"list\" operator";
4457 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
4459 : *listtype=='a'?"address "
4460 : *listtype=='d'?"domain "
4461 : *listtype=='h'?"host "
4462 : *listtype=='l'?"localpart "
4467 list = ((namedlist_block *)(t->data.ptr))->string;
4469 /* The list could be quite long so we (re)use a buffer for each element
4470 rather than getting each in new memory */
4472 if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, GET_TAINTED);
4473 while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE)))
4475 uschar * buf = US" : ";
4477 yield = string_catn(yield, buf, 3);
4481 if (*item == '+') /* list item is itself a named list */
4483 yield = expand_listnamed(yield, item, listtype);
4484 if (expand_string_message)
4488 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
4491 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
4493 for(char * cp; cp = strpbrk(CCS item, tok); item = US cp)
4495 yield = string_catn(yield, item, cp - CS item);
4496 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
4497 yield = string_catn(yield, US"::", 2);
4498 else /* sep in item; should already be doubled; emit once */
4500 yield = string_catn(yield, US tok, 1);
4501 if (*cp == sep) cp++;
4504 yield = string_cat(yield, item);
4507 yield = string_cat(yield, item);
4514 /************************************************/
4516 debug_expansion_interim(const uschar * what, const uschar * value, int nchar,
4519 debug_printf_indent("%V", "K");
4521 for (int fill = 11 - Ustrlen(what); fill > 0; fill--)
4522 debug_printf("%V", "-");
4524 debug_printf("%s: %.*W\n", what, nchar, value);
4525 if (is_tainted(value))
4526 debug_printf_indent("%V %V(tainted)\n",
4527 flags & ESI_SKIPPING ? "|" : " ", "\\__");
4531 /*************************************************
4533 *************************************************/
4535 /* Returns either an unchanged string, or the expanded string in stacking pool
4536 store. Interpreted sequences are:
4538 \... normal escaping rules
4539 $name substitutes the variable
4541 ${op:string} operates on the expanded string value
4542 ${item{arg1}{arg2}...} expands the args and then does the business
4543 some literal args are not enclosed in {}
4545 There are now far too many operators and item types to make it worth listing
4546 them here in detail any more.
4548 We use an internal routine recursively to handle embedded substrings. The
4549 external function follows. The yield is NULL if the expansion failed, and there
4550 are two cases: if something collapsed syntactically, or if "fail" was given
4551 as the action on a lookup failure. These can be distinguished by looking at the
4552 variable expand_string_forcedfail, which is TRUE in the latter case.
4554 The skipping flag is set true when expanding a substring that isn't actually
4555 going to be used (after "if" or "lookup") and it prevents lookups from
4556 happening lower down.
4558 Store usage: At start, a store block of the length of the input plus 64
4559 is obtained. This is expanded as necessary by string_cat(), which might have to
4560 get a new block, or might be able to expand the original. At the end of the
4561 function we can release any store above that portion of the yield block that
4562 was actually used. In many cases this will be optimal.
4564 However: if the first item in the expansion is a variable name or header name,
4565 we reset the store before processing it; if the result is in fresh store, we
4566 use that without copying. This is helpful for expanding strings like
4567 $message_headers which can get very long.
4569 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4570 since resetting the store at the end of the expansion will free store that was
4571 allocated by the plugin code as well as the slop after the expanded string. So
4572 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4573 and, given the acl condition, ${if }. This is an unfortunate consequence of
4574 string expansion becoming too powerful.
4577 string the string to be expanded
4579 brace_ends expansion is to stop at }
4580 honour_dollar TRUE if $ is to be expanded,
4581 FALSE if it's just another character
4582 skipping TRUE for recursive calls when the value isn't actually going
4583 to be used (to allow for optimisation)
4584 left if not NULL, a pointer to the first character after the
4585 expansion is placed here (typically used with brace_ends)
4586 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4588 textonly_p if not NULL, pointer to flag - write bool for only-met-text
4590 Returns: NULL if expansion fails:
4591 expand_string_forcedfail is set TRUE if failure was forced
4592 expand_string_message contains a textual error message
4593 a pointer to the expanded string on success
4597 expand_string_internal(const uschar * string, esi_flags flags, const uschar ** left,
4598 BOOL *resetok_p, BOOL * textonly_p)
4600 rmark reset_point = store_mark();
4601 gstring * yield = string_get(Ustrlen(string) + 64);
4603 const uschar * s = string;
4604 const uschar * save_expand_nstring[EXPAND_MAXN+1];
4605 int save_expand_nlength[EXPAND_MAXN+1];
4606 BOOL resetok = TRUE, first = TRUE, textonly = TRUE;
4609 f.expand_string_forcedfail = FALSE;
4610 expand_string_message = US"";
4612 if (is_tainted(string))
4614 expand_string_message =
4615 string_sprintf("attempt to expand tainted string '%s'", s);
4616 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4626 debug_printf_indent("%V%V%s: %W\n",
4628 flags & ESI_SKIPPING ? "---" : "",
4629 flags & ESI_SKIPPING ? "scanning" : "considering", s);
4633 /* \ escapes the next character, which must exist, or else
4634 the expansion fails. There's a special escape, \N, which causes
4635 copying of the subject verbatim up to the next \N. Otherwise,
4636 the escapes are the standard set. */
4642 expand_string_message = US"\\ at end of string";
4648 const uschar * t = s + 2;
4649 for (s = t; *s ; s++) if (*s == '\\' && s[1] == 'N') break;
4652 debug_expansion_interim(US"protected", t, (int)(s - t), flags);
4653 if (!(flags & ESI_SKIPPING))
4654 yield = string_catn(yield, t, s - t);
4661 debug_printf_indent("%Vbackslashed: '\\%c'\n", "K", s[1]);
4662 ch[0] = string_interpret_escape(&s);
4663 if (!(flags & ESI_SKIPPING))
4664 yield = string_catn(yield, ch, 1);
4671 /* Anything other than $ is just copied verbatim, unless we are
4672 looking for a terminating } character. */
4674 if (flags & ESI_BRACE_ENDS && *s == '}') break;
4676 if (*s != '$' || !(flags & ESI_HONOR_DOLLAR))
4679 for (const uschar * t = s+1;
4680 *t && *t != '$' && *t != '}' && *t != '\\'; t++) i++;
4682 DEBUG(D_expand) debug_expansion_interim(US"text", s, i, flags);
4684 if (!(flags & ESI_SKIPPING))
4685 yield = string_catn(yield, s, i);
4691 /* No { after the $ - must be a plain name or a number for string
4692 match variable. There has to be a fudge for variables that are the
4693 names of header fields preceded by "$header_" because header field
4694 names can contain any printing characters except space and colon.
4695 For those that don't like typing this much, "$h_" is a synonym for
4696 "$header_". A non-existent header yields a NULL value; nothing is
4701 const uschar * value;
4702 int newsize = 0, len;
4706 s = read_name(name, sizeof(name), s, US"_");
4708 /* If this is the first thing to be expanded, release the pre-allocated
4711 if (!(flags & ESI_SKIPPING))
4713 g = store_get(sizeof(gstring), GET_UNTAINTED);
4714 else if (yield->ptr == 0)
4716 if (resetok) reset_point = store_reset(reset_point);
4718 reset_point = store_mark();
4719 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
4724 if ( ( *(t = name) == 'h'
4725 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4727 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4730 unsigned flags = *name == 'r' ? FH_WANT_RAW
4731 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4733 const uschar * charset = *name == 'b' ? NULL : headers_charset;
4735 s = read_header_name(name, sizeof(name), s);
4736 value = find_header(name, &newsize, flags, charset);
4738 /* If we didn't find the header, and the header contains a closing brace
4739 character, this may be a user error where the terminating colon
4740 has been omitted. Set a flag to adjust the error message in this case.
4741 But there is no error here - nothing gets inserted. */
4745 if (Ustrchr(name, '}')) malformed_header = TRUE;
4752 else if (!(value = find_variable(name, flags, &newsize)))
4754 expand_string_message =
4755 string_sprintf("unknown variable name \"%s\"", name);
4756 check_variable_error_message(name);
4760 /* If the data is known to be in a new buffer, newsize will be set to the
4761 size of that buffer. If this is the first thing in an expansion string,
4762 yield will be NULL; just point it at the new store instead of copying. Many
4763 expansion strings contain just one reference, so this is a useful
4764 optimization, especially for humungous headers. We need to use a gstring
4765 structure that is not allocated after that new-buffer, else a later store
4766 reset in the middle of the buffer will make it inaccessible. */
4768 len = Ustrlen(value);
4769 DEBUG(D_expand) debug_expansion_interim(US"value", value, len, flags);
4770 if (!(flags & ESI_SKIPPING))
4771 if (!yield && newsize != 0)
4774 yield->size = newsize;
4776 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
4779 yield = string_catn(yield, value, len);
4784 if (isdigit(*s)) /* A $<n> variable */
4787 s = read_cnumber(&n, s);
4788 if (n >= 0 && n <= expand_nmax)
4790 DEBUG(D_expand) debug_expansion_interim(US"value", expand_nstring[n], expand_nlength[n], flags);
4791 if (!(flags & ESI_SKIPPING))
4792 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4797 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4799 if (*s != '{') /*}*/
4801 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4805 /* After { there can be various things, but they all start with
4806 an initial word, except for a number for a string match variable. */ /*}*/
4811 s = read_cnumber(&n, s); /*{{*/
4814 expand_string_message = US"} expected after number";
4817 if (n >= 0 && n <= expand_nmax)
4819 DEBUG(D_expand) debug_expansion_interim(US"value", expand_nstring[n], expand_nlength[n], flags);
4820 if (!(flags & ESI_SKIPPING))
4821 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4828 expand_string_message = US"letter or digit expected after ${"; /*}*/
4832 /* Allow "-" in names to cater for substrings with negative
4833 arguments. Since we are checking for known names after { this is
4836 s = read_name(name, sizeof(name), s, US"_-");
4837 item_type = chop_match(name, item_table, nelem(item_table));
4839 /* Switch on item type. All nondefault choices should "continue* when
4840 skipping, but "break" otherwise so we get debug output for the item
4843 int expansion_start = gstring_length(yield);
4846 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4847 If the ACL returns accept or reject we return content set by "message ="
4848 There is currently no limit on recursion; this would have us call
4849 acl_check_internal() directly and get a current level from somewhere.
4850 See also the acl expansion condition ECOND_ACL and the traditional
4851 acl modifier ACLC_ACL.
4852 Assume that the function has side-effects on the store that must be preserved.
4856 /* ${acl {name} {arg1}{arg2}...} */
4858 uschar * sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4862 switch(read_subs(sub, nelem(sub), 1, &s, flags, TRUE, name, &resetok, NULL))
4864 case -1: continue; /* skipping */
4865 case 1: goto EXPAND_FAILED_CURLY;
4867 case 3: goto EXPAND_FAILED;
4871 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4876 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4878 yield = string_cat(yield, user_msg);
4882 f.expand_string_forcedfail = TRUE;
4885 expand_string_message = string_sprintf("%s from acl \"%s\"",
4886 rc_names[rc], sub[0]);
4892 case EITEM_AUTHRESULTS:
4893 /* ${authresults {mysystemname}} */
4895 uschar * sub_arg[1];
4897 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, flags, TRUE, name, &resetok, NULL))
4899 case -1: continue; /* If skipping, we don't actually do anything */
4900 case 1: goto EXPAND_FAILED_CURLY;
4902 case 3: goto EXPAND_FAILED;
4905 yield = string_append(yield, 3,
4906 US"Authentication-Results: ", sub_arg[0], US"; none");
4907 yield->ptr -= 6; /* ignore tha ": none" for now */
4909 yield = authres_local(yield, sub_arg[0]);
4910 yield = authres_iprev(yield);
4911 yield = authres_smtpauth(yield);
4913 yield = authres_spf(yield);
4915 #ifndef DISABLE_DKIM
4916 yield = authres_dkim(yield);
4918 #ifdef SUPPORT_DMARC
4919 yield = authres_dmarc(yield);
4921 #ifdef EXPERIMENTAL_ARC
4922 yield = authres_arc(yield);
4927 /* Handle conditionals - preserve the values of the numerical expansion
4928 variables in case they get changed by a regular expression match in the
4929 condition. If not, they retain their external settings. At the end
4930 of this "if" section, they get restored to their previous values. */
4935 const uschar *next_s;
4936 int save_expand_nmax =
4937 save_expand_strings(save_expand_nstring, save_expand_nlength);
4938 uschar * save_lookup_value = lookup_value;
4940 Uskip_whitespace(&s);
4941 if (!(next_s = eval_condition(s, &resetok, flags & ESI_SKIPPING ? NULL : &cond)))
4942 goto EXPAND_FAILED; /* message already set */
4946 debug_expansion_interim(US"condition", s, (int)(next_s - s), flags);
4947 debug_expansion_interim(US"result",
4948 cond ? US"true" : US"false", cond ? 4 : 5, flags);
4953 /* The handling of "yes" and "no" result strings is now in a separate
4954 function that is also used by ${lookup} and ${extract} and ${run}. */
4956 switch(process_yesno(
4957 flags, /* were previously skipping */
4958 cond, /* success/failure indicator */
4959 lookup_value, /* value to reset for string2 */
4960 &s, /* input pointer */
4961 &yield, /* output pointer */
4962 US"if", /* condition type */
4965 case 1: goto EXPAND_FAILED; /* when all is well, the */
4966 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4969 /* Restore external setting of expansion variables for continuation
4972 lookup_value = save_lookup_value;
4973 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4974 save_expand_nlength);
4979 case EITEM_IMAPFOLDER:
4980 { /* ${imapfolder {name}{sep}{specials}} */
4984 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, flags, TRUE, name, &resetok, NULL))
4986 case 1: goto EXPAND_FAILED_CURLY;
4988 case 3: goto EXPAND_FAILED;
4991 if (!sub_arg[1]) /* One argument */
4993 sub_arg[1] = US"/"; /* default separator */
4996 else if (Ustrlen(sub_arg[1]) != 1)
4998 expand_string_message =
5000 "IMAP folder separator must be one character, found \"%s\"",
5005 if (flags & ESI_SKIPPING) continue;
5007 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
5008 sub_arg[1][0], sub_arg[2], &expand_string_message)))
5010 yield = string_cat(yield, encoded);
5015 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
5016 expanding an internal string that isn't actually going to be used. All we
5017 need to do is check the syntax, so don't do a lookup at all. Preserve the
5018 values of the numerical expansion variables in case they get changed by a
5019 partial lookup. If not, they retain their external settings. At the end
5020 of this "lookup" section, they get restored to their previous values. */
5024 int stype, partial, affixlen, starflags;
5025 int expand_setup = 0;
5027 uschar * key, * filename;
5028 const uschar * affix, * opts;
5029 uschar * save_lookup_value = lookup_value;
5030 int save_expand_nmax =
5031 save_expand_strings(save_expand_nstring, save_expand_nlength);
5033 if (expand_forbid & RDO_LOOKUP)
5035 expand_string_message = US"lookup expansions are not permitted";
5039 /* Get the key we are to look up for single-key+file style lookups.
5040 Otherwise set the key NULL pro-tem. */
5042 if (Uskip_whitespace(&s) == '{') /*}*/
5044 key = expand_string_internal(s+1,
5045 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
5046 if (!key) goto EXPAND_FAILED; /*{{*/
5049 expand_string_message = US"missing '}' after lookup key";
5050 goto EXPAND_FAILED_CURLY;
5052 Uskip_whitespace(&s);
5056 /* Find out the type of database */
5060 expand_string_message = US"missing lookup type";
5064 /* The type is a string that may contain special characters of various
5065 kinds. Allow everything except space or { to appear; the actual content
5066 is checked by search_findtype_partial. */ /*}*/
5068 while (*s && *s != '{' && !isspace(*s)) /*}*/
5070 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
5073 name[nameptr] = '\0';
5074 Uskip_whitespace(&s);
5076 /* Now check for the individual search type and any partial or default
5077 options. Only those types that are actually in the binary are valid. */
5079 if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen,
5080 &starflags, &opts)) < 0)
5082 expand_string_message = search_error_message;
5086 /* Check that a key was provided for those lookup types that need it,
5087 and was not supplied for those that use the query style. */
5089 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
5093 expand_string_message = string_sprintf("missing {key} for single-"
5094 "key \"%s\" lookup", name);
5100 expand_string_message = string_sprintf("a single key was given for "
5101 "lookup type \"%s\", which is not a single-key lookup type", name);
5105 /* Get the next string in brackets and expand it. It is the file name for
5106 single-key+file lookups, and the whole query otherwise. In the case of
5107 queries that also require a file name (e.g. sqlite), the file name comes
5112 expand_string_message = US"missing '{' for lookup file-or-query arg";
5113 goto EXPAND_FAILED_CURLY; /*}}*/
5115 if (!(filename = expand_string_internal(s+1,
5116 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
5121 expand_string_message = US"missing '}' closing lookup file-or-query arg";
5122 goto EXPAND_FAILED_CURLY;
5124 Uskip_whitespace(&s);
5126 /* If this isn't a single-key+file lookup, re-arrange the variables
5127 to be appropriate for the search_ functions. For query-style lookups,
5128 there is just a "key", and no file name. For the special query-style +
5129 file types, the query (i.e. "key") starts with a file name. */
5132 key = search_args(stype, name, filename, &filename, opts);
5134 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
5135 the entry was not found. Note that there is no search_close() function.
5136 Files are left open in case of re-use. At suitable places in higher logic,
5137 search_tidyup() is called to tidy all open files. This can save opening
5138 the same file several times. However, files may also get closed when
5139 others are opened, if too many are open at once. The rule is that a
5140 handle should not be used after a second search_open().
5142 Request that a partial search sets up $1 and maybe $2 by passing
5143 expand_setup containing zero. If its value changes, reset expand_nmax,
5144 since new variables will have been set. Note that at the end of this
5145 "lookup" section, the old numeric variables are restored. */
5147 if (flags & ESI_SKIPPING)
5148 lookup_value = NULL;
5151 void * handle = search_open(filename, stype, 0, NULL, NULL);
5154 expand_string_message = search_error_message;
5157 lookup_value = search_find(handle, filename, key, partial, affix,
5158 affixlen, starflags, &expand_setup, opts);
5159 if (f.search_find_defer)
5161 expand_string_message =
5162 string_sprintf("lookup of \"%s\" gave DEFER: %s",
5163 string_printing2(key, SP_TAB), search_error_message);
5166 if (expand_setup > 0) expand_nmax = expand_setup;
5169 /* The handling of "yes" and "no" result strings is now in a separate
5170 function that is also used by ${if} and ${extract}. */
5172 switch(process_yesno(
5173 flags, /* were previously skipping */
5174 lookup_value != NULL, /* success/failure indicator */
5175 save_lookup_value, /* value to reset for string2 */
5176 &s, /* input pointer */
5177 &yield, /* output pointer */
5178 US"lookup", /* condition type */
5181 case 1: goto EXPAND_FAILED; /* when all is well, the */
5182 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5185 /* Restore external setting of expansion variables for carrying on
5186 at this level, and continue. */
5188 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5189 save_expand_nlength);
5191 if (flags & ESI_SKIPPING) continue;
5195 /* If Perl support is configured, handle calling embedded perl subroutines,
5196 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
5197 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
5198 arguments (defined below). */
5200 #define EXIM_PERL_MAX_ARGS 8
5204 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
5205 "is not included in this binary";
5208 #else /* EXIM_PERL */
5210 uschar * sub_arg[EXIM_PERL_MAX_ARGS + 2];
5211 gstring * new_yield;
5213 if (expand_forbid & RDO_PERL)
5215 expand_string_message = US"Perl calls are not permitted";
5219 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, flags, TRUE,
5220 name, &resetok, NULL))
5222 case -1: continue; /* If skipping, we don't actually do anything */
5223 case 1: goto EXPAND_FAILED_CURLY;
5225 case 3: goto EXPAND_FAILED;
5228 /* Start the interpreter if necessary */
5230 if (!opt_perl_started)
5233 if (!opt_perl_startup)
5235 expand_string_message = US"A setting of perl_startup is needed when "
5236 "using the Perl interpreter";
5239 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
5240 if ((initerror = init_perl(opt_perl_startup)))
5242 expand_string_message =
5243 string_sprintf("error in perl_startup code: %s\n", initerror);
5246 opt_perl_started = TRUE;
5249 /* Call the function */
5251 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5252 new_yield = call_perl_cat(yield, &expand_string_message,
5253 sub_arg[0], sub_arg + 1);
5255 /* NULL yield indicates failure; if the message pointer has been set to
5256 NULL, the yield was undef, indicating a forced failure. Otherwise the
5257 message will indicate some kind of Perl error. */
5261 if (!expand_string_message)
5263 expand_string_message =
5264 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5265 "failure", sub_arg[0]);
5266 f.expand_string_forcedfail = TRUE;
5271 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5272 set during a callback from Perl. */
5274 f.expand_string_forcedfail = FALSE;
5278 #endif /* EXIM_PERL */
5280 /* Transform email address to "prvs" scheme to use
5281 as BATV-signed return path */
5285 uschar * sub_arg[3], * p, * domain;
5287 switch(read_subs(sub_arg, 3, 2, &s, flags, TRUE, name, &resetok, NULL))
5289 case -1: continue; /* If skipping, we don't actually do anything */
5290 case 1: goto EXPAND_FAILED_CURLY;
5292 case 3: goto EXPAND_FAILED;
5295 /* sub_arg[0] is the address */
5296 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5297 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5299 expand_string_message = US"prvs first argument must be a qualified email address";
5303 /* Calculate the hash. The third argument must be a single-digit
5304 key number, or unset. */
5307 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5309 expand_string_message = US"prvs third argument must be a single digit";
5313 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5316 expand_string_message = US"prvs hmac-sha1 conversion failed";
5320 /* Now separate the domain from the local part */
5323 yield = string_catn(yield, US"prvs=", 5);
5324 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5325 yield = string_catn(yield, prvs_daystamp(7), 3);
5326 yield = string_catn(yield, p, 6);
5327 yield = string_catn(yield, US"=", 1);
5328 yield = string_cat (yield, sub_arg[0]);
5329 yield = string_catn(yield, US"@", 1);
5330 yield = string_cat (yield, domain);
5335 /* Check a prvs-encoded address for validity */
5337 case EITEM_PRVSCHECK:
5339 uschar * sub_arg[3], * p;
5341 const pcre2_code * re;
5343 /* Reset expansion variables */
5344 prvscheck_result = NULL;
5345 prvscheck_address = NULL;
5346 prvscheck_keynum = NULL;
5348 switch(read_subs(sub_arg, 1, 1, &s, flags, FALSE, name, &resetok, NULL))
5350 case 1: goto EXPAND_FAILED_CURLY;
5352 case 3: goto EXPAND_FAILED;
5355 re = regex_must_compile(
5356 US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5357 MCS_CASELESS | MCS_CACHEABLE, FALSE);
5359 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5361 uschar * local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5362 uschar * key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5363 uschar * daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5364 uschar * hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5365 uschar * domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5369 debug_printf_indent("prvscheck localpart: %s\n", local_part);
5370 debug_printf_indent("prvscheck key number: %s\n", key_num);
5371 debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5372 debug_printf_indent("prvscheck hash: %s\n", hash);
5373 debug_printf_indent("prvscheck domain: %s\n", domain);
5376 /* Set up expansion variables */
5377 g = string_cat (NULL, local_part);
5378 g = string_catn(g, US"@", 1);
5379 g = string_cat (g, domain);
5380 prvscheck_address = string_from_gstring(g);
5381 prvscheck_keynum = string_copy(key_num);
5383 /* Now expand the second argument */
5384 switch(read_subs(sub_arg, 1, 1, &s, flags, FALSE, name, &resetok, NULL))
5386 case 1: goto EXPAND_FAILED_CURLY;
5388 case 3: goto EXPAND_FAILED;
5391 /* Now we have the key and can check the address. */
5393 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5397 expand_string_message = US"hmac-sha1 conversion failed";
5401 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5402 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5404 if (Ustrcmp(p,hash) == 0)
5406 /* Success, valid BATV address. Now check the expiry date. */
5407 uschar *now = prvs_daystamp(0);
5408 unsigned int inow = 0,iexpire = 1;
5410 (void)sscanf(CS now,"%u",&inow);
5411 (void)sscanf(CS daystamp,"%u",&iexpire);
5413 /* When "iexpire" is < 7, a "flip" has occurred.
5414 Adjust "inow" accordingly. */
5415 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5417 if (iexpire >= inow)
5419 prvscheck_result = US"1";
5420 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $prvscheck_result set to 1\n");
5424 prvscheck_result = NULL;
5425 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $prvscheck_result unset\n");
5430 prvscheck_result = NULL;
5431 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $prvscheck_result unset\n");
5434 /* Now expand the final argument. We leave this till now so that
5435 it can include $prvscheck_result. */
5437 switch(read_subs(sub_arg, 1, 0, &s, flags, TRUE, name, &resetok, NULL))
5439 case 1: goto EXPAND_FAILED_CURLY;
5441 case 3: goto EXPAND_FAILED;
5444 yield = string_cat(yield,
5445 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5447 /* Reset the "internal" variables afterwards, because they are in
5448 dynamic store that will be reclaimed if the expansion succeeded. */
5450 prvscheck_address = NULL;
5451 prvscheck_keynum = NULL;
5454 /* Does not look like a prvs encoded address, return the empty string.
5455 We need to make sure all subs are expanded first, so as to skip over
5458 switch(read_subs(sub_arg, 2, 1, &s, flags, TRUE, name, &resetok, NULL))
5460 case 1: goto EXPAND_FAILED_CURLY;
5462 case 3: goto EXPAND_FAILED;
5465 if (flags & ESI_SKIPPING) continue;
5469 /* Handle "readfile" to insert an entire file */
5471 case EITEM_READFILE:
5474 uschar * sub_arg[2];
5476 if ((expand_forbid & RDO_READFILE) != 0)
5478 expand_string_message = US"file insertions are not permitted";
5482 switch(read_subs(sub_arg, 2, 1, &s, flags, TRUE, name, &resetok, NULL))
5484 case -1: continue; /* If skipping, we don't actually do anything */
5485 case 1: goto EXPAND_FAILED_CURLY;
5487 case 3: goto EXPAND_FAILED;
5490 /* Open the file and read it */
5492 if (!(f = Ufopen(sub_arg[0], "rb")))
5494 expand_string_message = string_open_failed("%s", sub_arg[0]);
5498 yield = cat_file(f, yield, sub_arg[1]);
5503 /* Handle "readsocket" to insert data from a socket, either
5504 Inet or Unix domain */
5506 case EITEM_READSOCK:
5509 uschar * sub_arg[4];
5511 if (expand_forbid & RDO_READSOCK)
5513 expand_string_message = US"socket insertions are not permitted";
5517 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5518 because there may be a string for expansion on failure. */
5520 switch(read_subs(sub_arg, 4, 2, &s, flags, FALSE, name, &resetok, NULL))
5522 case 1: goto EXPAND_FAILED_CURLY;
5523 case 2: /* Won't occur: no end check */
5524 case 3: goto EXPAND_FAILED;
5527 /* If skipping, we don't actually do anything. Otherwise, arrange to
5528 connect to either an IP or a Unix socket. */
5530 if (!(flags & ESI_SKIPPING))
5532 int stype = search_findtype(US"readsock", 8);
5535 int expand_setup = -1;
5538 /* If the reqstr is empty, flag that and set a dummy */
5542 g = string_append_listele(g, ',', US"send=no");
5543 sub_arg[1] = US"DUMMY";
5546 /* Re-marshall the options */
5550 const uschar * list = sub_arg[2];
5554 /* First option has no tag and is timeout */
5555 if ((item = string_nextinlist(&list, &sep, NULL, 0)))
5556 g = string_append_listele(g, ',',
5557 string_sprintf("timeout=%s", item));
5559 /* The rest of the options from the expansion */
5560 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5561 g = string_append_listele(g, ',', item);
5563 /* possibly plus an EOL string. Process with escapes, to protect
5564 from list-processing. The only current user of eol= in search
5565 options is the readsock expansion. */
5567 if (sub_arg[3] && *sub_arg[3])
5568 g = string_append_listele(g, ',',
5569 string_sprintf("eol=%s",
5570 string_printing2(sub_arg[3], SP_TAB|SP_SPACE)));
5573 /* Gat a (possibly cached) handle for the connection */
5575 if (!(handle = search_open(sub_arg[0], stype, 0, NULL, NULL)))
5577 if (*expand_string_message) goto EXPAND_FAILED;
5578 expand_string_message = search_error_message;
5579 search_error_message = NULL;
5583 /* Get (possibly cached) results for the lookup */
5584 /* sspec: sub_arg[0] req: sub_arg[1] opts: g */
5586 if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0,
5587 &expand_setup, string_from_gstring(g))))
5588 yield = string_cat(yield, s);
5589 else if (f.search_find_defer)
5591 expand_string_message = search_error_message;
5592 search_error_message = NULL;
5596 { /* should not happen, at present */
5597 expand_string_message = search_error_message;
5598 search_error_message = NULL;
5603 /* The whole thing has worked (or we were skipping). If there is a
5604 failure string following, we need to skip it. */
5606 if (*s == '{') /*}*/
5608 if (!expand_string_internal(s+1,
5609 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL))
5610 goto EXPAND_FAILED; /*{*/
5613 expand_string_message = US"missing '}' closing failstring for readsocket";
5614 goto EXPAND_FAILED_CURLY;
5616 Uskip_whitespace(&s);
5619 READSOCK_DONE: /*{*/
5622 expand_string_message = US"missing '}' closing readsocket";
5623 goto EXPAND_FAILED_CURLY;
5625 if (flags & ESI_SKIPPING) continue;
5628 /* Come here on failure to create socket, connect socket, write to the
5629 socket, or timeout on reading. If another substring follows, expand and
5630 use it. Otherwise, those conditions give expand errors. */
5633 if (*s != '{') goto EXPAND_FAILED; /*}*/
5634 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5635 if (!(arg = expand_string_internal(s+1,
5636 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR, &s, &resetok, NULL)))
5638 yield = string_cat(yield, arg); /*{*/
5641 expand_string_message = US"missing '}' closing failstring for readsocket";
5642 goto EXPAND_FAILED_CURLY;
5644 Uskip_whitespace(&s);
5648 /* Handle "run" to execute a program. */
5653 const uschar * arg, ** argv;
5654 unsigned late_expand = TSUC_EXPAND_ARGS | TSUC_ALLOW_TAINTED_ARGS | TSUC_ALLOW_RECIPIENTS;
5656 if (expand_forbid & RDO_RUN)
5658 expand_string_message = US"running a command is not permitted";
5662 /* Handle options to the "run" */
5665 if (Ustrncmp(++s, "preexpand", 9) == 0)
5666 { late_expand = 0; s += 9; }
5669 const uschar * t = s;
5670 while (isalpha(*++t)) ;
5671 expand_string_message = string_sprintf("bad option '%.*s' for run",
5675 Uskip_whitespace(&s);
5677 if (*s != '{') /*}*/
5679 expand_string_message = US"missing '{' for command arg of run";
5680 goto EXPAND_FAILED_CURLY; /*"}*/
5684 if (late_expand) /* this is the default case */
5688 /* Locate the end of the args */
5689 (void) expand_string_internal(s,
5690 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &t, NULL, NULL);
5692 arg = flags & ESI_SKIPPING ? NULL : string_copyn(s, n);
5698 debug_printf_indent("args string for ${run} expand before split\n");
5699 if (!(arg = expand_string_internal(s,
5700 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
5702 Uskip_whitespace(&s);
5707 expand_string_message = US"missing '}' closing command arg of run";
5708 goto EXPAND_FAILED_CURLY;
5711 if (flags & ESI_SKIPPING) /* Just pretend it worked when we're skipping */
5714 lookup_value = NULL;
5721 if (!transport_set_up_command(&argv, /* anchor for arg list */
5722 arg, /* raw command */
5723 late_expand, /* expand args if not already done */
5724 0, /* not relevant when... */
5725 NULL, /* no transporting address */
5726 US"${run} expansion", /* for error messages */
5727 &expand_string_message)) /* where to put error message */
5730 /* Create the child process, making it a group leader. */
5732 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5733 US"expand-run")) < 0)
5735 expand_string_message =
5736 string_sprintf("couldn't create child process: %s", strerror(errno));
5740 /* Nothing is written to the standard input. */
5744 /* Read the pipe to get the command's output into $value (which is kept
5745 in lookup_value). Read during execution, so that if the output exceeds
5746 the OS pipe buffer limit, we don't block forever. Remember to not release
5747 memory just allocated for $value. */
5750 f = fdopen(fd_out, "rb");
5751 sigalrm_seen = FALSE;
5753 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5757 /* Wait for the process to finish, applying the timeout, and inspect its
5758 return code for serious disasters. Simple non-zero returns are passed on.
5761 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5763 if (sigalrm_seen || runrc == -256)
5765 expand_string_message = US"command timed out";
5766 killpg(pid, SIGKILL); /* Kill the whole process group */
5769 else if (runrc == -257)
5770 expand_string_message = string_sprintf("wait() failed: %s",
5774 expand_string_message = string_sprintf("command killed by signal %d",
5781 /* Process the yes/no strings; $value may be useful in both cases */
5783 switch(process_yesno(
5784 flags, /* were previously skipping */
5785 runrc == 0, /* success/failure indicator */
5786 lookup_value, /* value to reset for string2 */
5787 &s, /* input pointer */
5788 &yield, /* output pointer */
5789 US"run", /* condition type */
5792 case 1: goto EXPAND_FAILED; /* when all is well, the */
5793 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5796 if (flags & ESI_SKIPPING) continue;
5800 /* Handle character translation for "tr" */
5804 int oldptr = gstring_length(yield);
5808 switch(read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, NULL))
5810 case -1: continue; /* skipping */
5811 case 1: goto EXPAND_FAILED_CURLY;
5813 case 3: goto EXPAND_FAILED;
5816 if ( (yield = string_cat(yield, sub[0]))
5817 && (o2m = Ustrlen(sub[2]) - 1) >= 0)
5818 for (; oldptr < yield->ptr; oldptr++)
5820 uschar * m = Ustrrchr(sub[1], yield->s[oldptr]);
5824 yield->s[oldptr] = sub[2][o < o2m ? o : o2m];
5831 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5832 expanded arguments. */
5841 int val[2] = { 0, -1 };
5844 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5845 Ensure that sub[2] is set in the ${length } case. */
5848 switch(read_subs(sub, item_type == EITEM_LENGTH ? 2:3, 2, &s, flags,
5849 TRUE, name, &resetok, NULL))
5851 case -1: continue; /* skipping */
5852 case 1: goto EXPAND_FAILED_CURLY;
5854 case 3: goto EXPAND_FAILED;
5857 /* Juggle the arguments if there are only two of them: always move the
5858 string to the last position and make ${length{n}{str}} equivalent to
5859 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5865 if (item_type == EITEM_LENGTH)
5872 for (int i = 0; i < 2; i++) if (sub[i])
5874 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5875 if (*ret != 0 || (i != 0 && val[i] < 0))
5877 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5878 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5884 item_type == EITEM_HASH
5885 ? compute_hash(sub[2], val[0], val[1], &len)
5886 : item_type == EITEM_NHASH
5887 ? compute_nhash(sub[2], val[0], val[1], &len)
5888 : extract_substr(sub[2], val[0], val[1], &len);
5891 yield = string_catn(yield, ret, len);
5895 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5896 This code originally contributed by Steve Haslam. It currently supports
5897 the use of MD5 and SHA-1 hashes.
5899 We need some workspace that is large enough to handle all the supported
5900 hash types. Use macros to set the sizes rather than be too elaborate. */
5902 #define MAX_HASHLEN 20
5903 #define MAX_HASHBLOCKLEN 64
5912 int hashlen; /* Number of octets for the hash algorithm's output */
5913 int hashblocklen; /* Number of octets the hash algorithm processes */
5914 uschar * keyptr, * p;
5915 unsigned int keylen;
5917 uschar keyhash[MAX_HASHLEN];
5918 uschar innerhash[MAX_HASHLEN];
5919 uschar finalhash[MAX_HASHLEN];
5920 uschar finalhash_hex[2*MAX_HASHLEN];
5921 uschar innerkey[MAX_HASHBLOCKLEN];
5922 uschar outerkey[MAX_HASHBLOCKLEN];
5924 switch (read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, NULL))
5926 case -1: continue; /* skipping */
5927 case 1: goto EXPAND_FAILED_CURLY;
5929 case 3: goto EXPAND_FAILED;
5932 if (Ustrcmp(sub[0], "md5") == 0)
5935 use_base = &md5_base;
5939 else if (Ustrcmp(sub[0], "sha1") == 0)
5942 use_base = &sha1_ctx;
5948 expand_string_message =
5949 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5954 keylen = Ustrlen(keyptr);
5956 /* If the key is longer than the hash block length, then hash the key
5959 if (keylen > hashblocklen)
5961 chash_start(type, use_base);
5962 chash_end(type, use_base, keyptr, keylen, keyhash);
5967 /* Now make the inner and outer key values */
5969 memset(innerkey, 0x36, hashblocklen);
5970 memset(outerkey, 0x5c, hashblocklen);
5972 for (int i = 0; i < keylen; i++)
5974 innerkey[i] ^= keyptr[i];
5975 outerkey[i] ^= keyptr[i];
5978 /* Now do the hashes */
5980 chash_start(type, use_base);
5981 chash_mid(type, use_base, innerkey);
5982 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5984 chash_start(type, use_base);
5985 chash_mid(type, use_base, outerkey);
5986 chash_end(type, use_base, innerhash, hashlen, finalhash);
5988 /* Encode the final hash as a hex string */
5991 for (int i = 0; i < hashlen; i++)
5993 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5994 *p++ = hex_digits[finalhash[i] & 0x0f];
5997 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5998 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
6000 yield = string_catn(yield, finalhash_hex, hashlen*2);
6004 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
6005 We have to save the numerical variables and restore them afterwards. */
6009 const pcre2_code * re;
6010 int moffset, moffsetextra, slen;
6011 pcre2_match_data * md;
6013 uschar * subject, * sub[3];
6014 int save_expand_nmax =
6015 save_expand_strings(save_expand_nstring, save_expand_nlength);
6016 unsigned sub_textonly = 0;
6018 switch(read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, &sub_textonly))
6020 case -1: continue; /* skipping */
6021 case 1: goto EXPAND_FAILED_CURLY;
6023 case 3: goto EXPAND_FAILED;
6026 /* Compile the regular expression */
6028 re = regex_compile(sub[1],
6029 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
6030 &expand_string_message, pcre_gen_cmp_ctx);
6034 md = pcre2_match_data_create(EXPAND_MAXN + 1, pcre_gen_ctx);
6036 /* Now run a loop to do the substitutions as often as necessary. It ends
6037 when there are no more matches. Take care over matches of the null string;
6038 do the same thing as Perl does. */
6041 slen = Ustrlen(sub[0]);
6042 moffset = moffsetextra = 0;
6047 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
6048 int n = pcre2_match(re, (PCRE2_SPTR)subject, slen, moffset + moffsetextra,
6049 PCRE_EOPT | emptyopt, md, pcre_gen_mtc_ctx);
6052 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
6053 is not necessarily the end. We want to repeat the match from one
6054 character further along, but leaving the basic offset the same (for
6055 copying below). We can't be at the end of the string - that was checked
6056 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
6057 finished; copy the remaining string and end the loop. */
6067 yield = string_catn(yield, subject+moffset, slen-moffset);
6071 /* Match - set up for expanding the replacement. */
6072 DEBUG(D_expand) debug_printf_indent("%s: match\n", name);
6074 if (n == 0) n = EXPAND_MAXN + 1;
6076 for (int nn = 0; nn < n*2; nn += 2)
6078 expand_nstring[expand_nmax] = subject + ovec[nn];
6079 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
6083 /* Copy the characters before the match, plus the expanded insertion. */
6085 yield = string_catn(yield, subject + moffset, ovec[0] - moffset);
6087 if (!(insert = expand_string(sub[2])))
6089 yield = string_cat(yield, insert);
6095 /* If we have matched an empty string, first check to see if we are at
6096 the end of the subject. If so, the loop is over. Otherwise, mimic
6097 what Perl's /g options does. This turns out to be rather cunning. First
6098 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
6099 string at the same point. If this fails (picked up above) we advance to
6100 the next character. */
6102 if (ovec[0] == ovec[1])
6104 if (ovec[0] == slen) break;
6105 emptyopt = PCRE2_NOTEMPTY | PCRE2_ANCHORED;
6109 /* All done - restore numerical variables. */
6111 /* pcre2_match_data_free(md); gen ctx needs no free */
6112 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6113 save_expand_nlength);
6117 /* Handle keyed and numbered substring extraction. If the first argument
6118 consists entirely of digits, then a numerical extraction is assumed. */
6122 int field_number = 1;
6123 BOOL field_number_set = FALSE;
6124 uschar * save_lookup_value = lookup_value, * sub[3];
6125 int save_expand_nmax =
6126 save_expand_strings(save_expand_nstring, save_expand_nlength);
6128 /* On reflection the original behaviour of extract-json for a string
6129 result, leaving it quoted, was a mistake. But it was already published,
6130 hence the addition of jsons. In a future major version, make json
6131 work like josons, and withdraw jsons. */
6133 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6135 /* Check for a format-variant specifier */
6137 if (Uskip_whitespace(&s) != '{') /*}*/
6138 if (Ustrncmp(s, "json", 4) == 0)
6139 if (*(s += 4) == 's')
6140 {fmt = extract_jsons; s++;}
6144 /* While skipping we cannot rely on the data for expansions being
6145 available (eg. $item) hence cannot decide on numeric vs. keyed.
6146 Read a maximum of 5 arguments (including the yes/no) */
6148 if (flags & ESI_SKIPPING)
6150 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6152 if (!expand_string_internal(s+1,
6153 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL))
6154 goto EXPAND_FAILED; /*'{'*/
6157 expand_string_message = US"missing '{' for arg of extract";
6158 goto EXPAND_FAILED_CURLY;
6160 Uskip_whitespace(&s);
6162 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6163 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6167 Uskip_whitespace(&s);
6171 expand_string_message = US"missing '}' closing extract";
6172 goto EXPAND_FAILED_CURLY;
6176 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6178 if (Uskip_whitespace(&s) == '{') /*'}'*/
6180 if (!(sub[i] = expand_string_internal(s+1,
6181 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
6182 goto EXPAND_FAILED; /*'{'*/
6185 expand_string_message = string_sprintf(
6186 "missing '}' closing arg %d of extract", i+1);
6187 goto EXPAND_FAILED_CURLY;
6190 /* After removal of leading and trailing white space, the first
6191 argument must not be empty; if it consists entirely of digits
6192 (optionally preceded by a minus sign), this is a numerical
6193 extraction, and we expect 3 arguments (normal) or 2 (json). */
6199 uschar * p = sub[0];
6201 Uskip_whitespace(&p);
6205 while (len > 0 && isspace(p[len-1])) len--;
6210 expand_string_message = US"first argument of \"extract\" must "
6220 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6224 if (fmt == extract_basic) j = 3; /* Need 3 args */
6225 field_number_set = TRUE;
6231 expand_string_message = string_sprintf(
6232 "missing '{' for arg %d of extract", i+1);
6233 goto EXPAND_FAILED_CURLY;
6237 /* Extract either the numbered or the keyed substring into $value. If
6238 skipping, just pretend the extraction failed. */
6240 if (flags & ESI_SKIPPING)
6241 lookup_value = NULL;
6245 lookup_value = field_number_set
6246 ? expand_gettokened(field_number, sub[1], sub[2])
6247 : expand_getkeyed(sub[0], sub[1]);
6254 const uschar * list;
6256 /* Array: Bracket-enclosed and comma-separated.
6257 Object: Brace-enclosed, comma-sep list of name:value pairs */
6259 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6261 expand_string_message =
6262 string_sprintf("%s wrapping %s for extract json",
6263 expand_string_message,
6264 field_number_set ? "array" : "object");
6265 goto EXPAND_FAILED_CURLY;
6269 if (field_number_set)
6271 if (field_number <= 0)
6273 expand_string_message = US"first argument of \"extract\" must "
6274 "be greater than zero";
6277 while (field_number > 0 && (item = json_nextinlist(&list)))
6279 if ((lookup_value = s = item))
6282 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6287 lookup_value = NULL;
6288 while ((item = json_nextinlist(&list)))
6290 /* Item is: string name-sep value. string is quoted.
6291 Dequote the string and compare with the search key. */
6293 if (!(item = dewrap(item, US"\"\"")))
6295 expand_string_message =
6296 string_sprintf("%s wrapping string key for extract json",
6297 expand_string_message);
6298 goto EXPAND_FAILED_CURLY;
6300 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6302 s = item + Ustrlen(item) + 1;
6303 if (Uskip_whitespace(&s) != ':')
6305 expand_string_message =
6306 US"missing object value-separator for extract json";
6307 goto EXPAND_FAILED_CURLY;
6310 Uskip_whitespace(&s);
6318 if ( fmt == extract_jsons
6320 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6322 expand_string_message =
6323 string_sprintf("%s wrapping string result for extract jsons",
6324 expand_string_message);
6325 goto EXPAND_FAILED_CURLY;
6330 /* If no string follows, $value gets substituted; otherwise there can
6331 be yes/no strings, as for lookup or if. */
6333 switch(process_yesno(
6334 flags, /* were previously skipping */
6335 lookup_value != NULL, /* success/failure indicator */
6336 save_lookup_value, /* value to reset for string2 */
6337 &s, /* input pointer */
6338 &yield, /* output pointer */
6339 US"extract", /* condition type */
6342 case 1: goto EXPAND_FAILED; /* when all is well, the */
6343 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6346 /* All done - restore numerical variables. */
6348 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6349 save_expand_nlength);
6351 if (flags & ESI_SKIPPING) continue;
6355 /* return the Nth item from a list */
6357 case EITEM_LISTEXTRACT:
6359 int field_number = 1;
6360 uschar * save_lookup_value = lookup_value, * sub[2];
6361 int save_expand_nmax =
6362 save_expand_strings(save_expand_nstring, save_expand_nlength);
6364 /* Read the field & list arguments */
6365 /*XXX Could we use read_subs here (and get better efficiency for skipping)? */
6367 for (int i = 0; i < 2; i++)
6369 if (Uskip_whitespace(&s) != '{') /*}*/
6371 expand_string_message = string_sprintf(
6372 "missing '{' for arg %d of listextract", i+1); /*}*/
6373 goto EXPAND_FAILED_CURLY;
6376 sub[i] = expand_string_internal(s+1,
6377 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6378 if (!sub[i]) goto EXPAND_FAILED; /*{{*/
6381 expand_string_message = string_sprintf(
6382 "missing '}' closing arg %d of listextract", i+1);
6383 goto EXPAND_FAILED_CURLY;
6386 /* After removal of leading and trailing white space, the first
6387 argument must be numeric and nonempty. */
6395 Uskip_whitespace(&p);
6399 while (len > 0 && isspace(p[len-1])) len--;
6402 if (!*p && !(flags & ESI_SKIPPING))
6404 expand_string_message = US"first argument of \"listextract\" must "
6414 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6417 expand_string_message = US"first argument of \"listextract\" must "
6425 /* Extract the numbered element into $value. If
6426 skipping, just pretend the extraction failed. */
6428 lookup_value = flags & ESI_SKIPPING ? NULL : expand_getlistele(field_number, sub[1]);
6430 /* If no string follows, $value gets substituted; otherwise there can
6431 be yes/no strings, as for lookup or if. */
6433 switch(process_yesno(
6434 flags, /* were previously skipping */
6435 lookup_value != NULL, /* success/failure indicator */
6436 save_lookup_value, /* value to reset for string2 */
6437 &s, /* input pointer */
6438 &yield, /* output pointer */
6439 US"listextract", /* condition type */
6442 case 1: goto EXPAND_FAILED; /* when all is well, the */
6443 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6446 /* All done - restore numerical variables. */
6448 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6449 save_expand_nlength);
6451 if (flags & ESI_SKIPPING) continue;
6455 case EITEM_LISTQUOTE:
6458 switch(read_subs(sub, 2, 2, &s, flags, TRUE, name, &resetok, NULL))
6460 case -1: continue; /* skipping */
6461 case 1: goto EXPAND_FAILED_CURLY;
6463 case 3: goto EXPAND_FAILED;
6465 if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6467 if (c == sep) yield = string_catn(yield, sub[1], 1);
6468 yield = string_catn(yield, sub[1], 1);
6470 else yield = string_catn(yield, US" ", 1);
6475 case EITEM_CERTEXTRACT:
6477 uschar * save_lookup_value = lookup_value, * sub[2];
6478 int save_expand_nmax =
6479 save_expand_strings(save_expand_nstring, save_expand_nlength);
6481 /* Read the field argument */
6482 if (Uskip_whitespace(&s) != '{') /*}*/
6484 expand_string_message = US"missing '{' for field arg of certextract";
6485 goto EXPAND_FAILED_CURLY; /*}*/
6487 sub[0] = expand_string_internal(s+1,
6488 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6489 if (!sub[0]) goto EXPAND_FAILED; /*{{*/
6492 expand_string_message = US"missing '}' closing field arg of certextract";
6493 goto EXPAND_FAILED_CURLY;
6495 /* strip spaces fore & aft */
6500 Uskip_whitespace(&p);
6504 while (len > 0 && isspace(p[len-1])) len--;
6508 /* inspect the cert argument */
6509 if (Uskip_whitespace(&s) != '{') /*}*/
6511 expand_string_message = US"missing '{' for cert variable arg of certextract";
6512 goto EXPAND_FAILED_CURLY; /*}*/
6516 expand_string_message = US"second argument of \"certextract\" must "
6517 "be a certificate variable";
6520 sub[1] = expand_string_internal(s+1,
6521 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s, &resetok, NULL);
6522 if (!sub[1]) goto EXPAND_FAILED; /*{{*/
6525 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6526 goto EXPAND_FAILED_CURLY;
6529 if (flags & ESI_SKIPPING)
6530 lookup_value = NULL;
6533 lookup_value = expand_getcertele(sub[0], sub[1]);
6534 if (*expand_string_message) goto EXPAND_FAILED;
6536 switch(process_yesno(
6537 flags, /* were previously skipping */
6538 lookup_value != NULL, /* success/failure indicator */
6539 save_lookup_value, /* value to reset for string2 */
6540 &s, /* input pointer */
6541 &yield, /* output pointer */
6542 US"certextract", /* condition type */
6545 case 1: goto EXPAND_FAILED; /* when all is well, the */
6546 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6549 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6550 save_expand_nlength);
6551 if (flags & ESI_SKIPPING) continue;
6554 #endif /*DISABLE_TLS*/
6556 /* Handle list operations */
6562 int sep = 0, save_ptr = gstring_length(yield);
6563 uschar outsep[2] = { '\0', '\0' };
6564 const uschar *list, *expr, *temp;
6565 uschar * save_iterate_item = iterate_item;
6566 uschar * save_lookup_value = lookup_value;
6568 Uskip_whitespace(&s);
6569 if (*s++ != '{') /*}*/
6571 expand_string_message =
6572 string_sprintf("missing '{' for first arg of %s", name);
6573 goto EXPAND_FAILED_CURLY; /*}*/
6576 DEBUG(D_expand) debug_printf_indent("%s: evaluate input list list\n", name);
6577 if (!(list = expand_string_internal(s,
6578 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
6579 goto EXPAND_FAILED; /*{{*/
6582 expand_string_message =
6583 string_sprintf("missing '}' closing first arg of %s", name);
6584 goto EXPAND_FAILED_CURLY;
6587 if (item_type == EITEM_REDUCE)
6590 Uskip_whitespace(&s);
6591 if (*s++ != '{') /*}*/
6593 expand_string_message = US"missing '{' for second arg of reduce";
6594 goto EXPAND_FAILED_CURLY; /*}*/
6596 DEBUG(D_expand) debug_printf_indent("reduce: initial result list\n");
6597 t = expand_string_internal(s,
6598 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6599 if (!t) goto EXPAND_FAILED;
6600 lookup_value = t; /*{{*/
6603 expand_string_message = US"missing '}' closing second arg of reduce";
6604 goto EXPAND_FAILED_CURLY;
6608 Uskip_whitespace(&s);
6609 if (*s++ != '{') /*}*/
6611 expand_string_message =
6612 string_sprintf("missing '{' for last arg of %s", name); /*}*/
6613 goto EXPAND_FAILED_CURLY;
6618 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6619 if scanning a "false" part). This allows us to find the end of the
6620 condition, because if the list is empty, we won't actually evaluate the
6621 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6622 the normal internal expansion function. */
6624 DEBUG(D_expand) debug_printf_indent("%s: find end of conditionn\n", name);
6625 if (item_type != EITEM_FILTER)
6626 temp = expand_string_internal(s,
6627 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL);
6629 if ((temp = eval_condition(expr, &resetok, NULL))) s = temp;
6633 expand_string_message = string_sprintf("%s inside \"%s\" item",
6634 expand_string_message, name);
6638 Uskip_whitespace(&s); /*{{{*/
6641 expand_string_message = string_sprintf("missing } at end of condition "
6642 "or expression inside \"%s\"; could be an unquoted } in the content",
6647 Uskip_whitespace(&s); /*{{*/
6650 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6655 /* If we are skipping, we can now just move on to the next item. When
6656 processing for real, we perform the iteration. */
6658 if (flags & ESI_SKIPPING) continue;
6659 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6661 *outsep = (uschar)sep; /* Separator as a string */
6663 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6664 name, iterate_item, lookup_value);
6666 if (item_type == EITEM_FILTER)
6669 /* the condition could modify $value, as a side-effect */
6670 uschar * save_value = lookup_value;
6672 if (!eval_condition(expr, &resetok, &condresult))
6674 iterate_item = save_iterate_item;
6675 lookup_value = save_lookup_value;
6676 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6677 expand_string_message, name);
6680 lookup_value = save_value;
6681 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6682 condresult? "true":"false");
6684 temp = iterate_item; /* TRUE => include this item */
6686 continue; /* FALSE => skip this item */
6689 else /* EITEM_MAP and EITEM_REDUCE */
6691 /* the expansion could modify $value, as a side-effect */
6692 uschar * t = expand_string_internal(expr,
6693 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, NULL, &resetok, NULL);
6696 iterate_item = save_iterate_item;
6697 expand_string_message = string_sprintf("%s inside \"%s\" item",
6698 expand_string_message, name);
6701 if (item_type == EITEM_REDUCE)
6703 lookup_value = t; /* Update the value of $value */
6704 continue; /* and continue the iteration */
6708 /* We reach here for FILTER if the condition is true, always for MAP,
6709 and never for REDUCE. The value in "temp" is to be added to the output
6710 list that is being created, ensuring that any occurrences of the
6711 separator character are doubled. Unless we are dealing with the first
6712 item of the output list, add in a space if the new item begins with the
6713 separator character, or is an empty string. */
6715 /*XXX is there not a standard support function for this, appending to a list? */
6716 /* yes, string_append_listele(), but it depends on lack of text before the list */
6718 if ( yield && yield->ptr != save_ptr
6719 && (temp[0] == *outsep || temp[0] == 0))
6720 yield = string_catn(yield, US" ", 1);
6722 /* Add the string in "temp" to the output list that we are building,
6723 This is done in chunks by searching for the separator character. */
6727 size_t seglen = Ustrcspn(temp, outsep);
6729 yield = string_catn(yield, temp, seglen + 1);
6731 /* If we got to the end of the string we output one character
6732 too many; backup and end the loop. Otherwise arrange to double the
6735 if (!temp[seglen]) { yield->ptr--; break; }
6736 yield = string_catn(yield, outsep, 1);
6740 /* Output a separator after the string: we will remove the redundant
6741 final one at the end. */
6743 yield = string_catn(yield, outsep, 1);
6744 } /* End of iteration over the list loop */
6746 /* REDUCE has generated no output above: output the final value of
6749 if (item_type == EITEM_REDUCE)
6751 yield = string_cat(yield, lookup_value);
6752 lookup_value = save_lookup_value; /* Restore $value */
6755 /* FILTER and MAP generate lists: if they have generated anything, remove
6756 the redundant final separator. Even though an empty item at the end of a
6757 list does not count, this is tidier. */
6759 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6761 /* Restore preserved $item */
6763 iterate_item = save_iterate_item;
6764 if (flags & ESI_SKIPPING) continue;
6770 int sep = 0, cond_type;
6771 const uschar * srclist, * cmp, * xtract;
6772 uschar * opname, * srcitem;
6773 const uschar * dstlist = NULL, * dstkeylist = NULL;
6774 uschar * tmp, * save_iterate_item = iterate_item;
6776 Uskip_whitespace(&s);
6777 if (*s++ != '{') /*}*/
6779 expand_string_message = US"missing '{' for list arg of sort";
6780 goto EXPAND_FAILED_CURLY; /*}*/
6783 srclist = expand_string_internal(s,
6784 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6785 if (!srclist) goto EXPAND_FAILED; /*{{*/
6788 expand_string_message = US"missing '}' closing list arg of sort";
6789 goto EXPAND_FAILED_CURLY;
6792 Uskip_whitespace(&s);
6793 if (*s++ != '{') /*}*/
6795 expand_string_message = US"missing '{' for comparator arg of sort";
6796 goto EXPAND_FAILED_CURLY; /*}*/
6799 cmp = expand_string_internal(s,
6800 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s, &resetok, NULL);
6801 if (!cmp) goto EXPAND_FAILED; /*{{*/
6804 expand_string_message = US"missing '}' closing comparator arg of sort";
6805 goto EXPAND_FAILED_CURLY;
6808 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6810 if (!expand_string_message)
6811 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6816 case ECOND_NUM_L: case ECOND_NUM_LE:
6817 case ECOND_NUM_G: case ECOND_NUM_GE:
6818 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6819 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6823 expand_string_message = US"comparator not handled for sort";
6827 Uskip_whitespace(&s);
6828 if (*s++ != '{') /*}*/
6830 expand_string_message = US"missing '{' for extractor arg of sort";
6831 goto EXPAND_FAILED_CURLY; /*}*/
6835 if (!(tmp = expand_string_internal(s,
6836 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL)))
6838 xtract = string_copyn(xtract, s - xtract);
6842 expand_string_message = US"missing '}' closing extractor arg of sort";
6843 goto EXPAND_FAILED_CURLY;
6848 expand_string_message = US"missing } at end of \"sort\"";
6852 if (flags & ESI_SKIPPING) continue;
6854 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6856 uschar * srcfield, * dstitem;
6857 gstring * newlist = NULL, * newkeylist = NULL;
6859 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6861 /* extract field for comparisons */
6862 iterate_item = srcitem;
6863 if ( !(srcfield = expand_string_internal(xtract,
6864 ESI_HONOR_DOLLAR, NULL, &resetok, NULL))
6867 expand_string_message = string_sprintf(
6868 "field-extract in sort: \"%s\"", xtract);
6872 /* Insertion sort */
6874 /* copy output list until new-item < list-item */
6875 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6879 /* field for comparison */
6880 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6883 /* String-comparator names start with a letter; numeric names do not */
6885 if (sortsbefore(cond_type, isalpha(opname[0]),
6886 srcfield, dstfield))
6888 /* New-item sorts before this dst-item. Append new-item,
6889 then dst-item, then remainder of dst list. */
6891 newlist = string_append_listele(newlist, sep, srcitem);
6892 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6895 newlist = string_append_listele(newlist, sep, dstitem);
6896 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6898 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6899 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6901 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6903 newlist = string_append_listele(newlist, sep, dstitem);
6904 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6910 newlist = string_append_listele(newlist, sep, dstitem);
6911 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6914 /* If we ran out of dstlist without consuming srcitem, append it */
6917 newlist = string_append_listele(newlist, sep, srcitem);
6918 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6921 dstlist = newlist->s;
6922 dstkeylist = newkeylist->s;
6924 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6925 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6929 yield = string_cat(yield, dstlist);
6931 /* Restore preserved $item */
6932 iterate_item = save_iterate_item;
6936 expand_string_message = US"Internal error in sort (list mismatch)";
6941 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6942 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6943 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6944 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6946 #define EXPAND_DLFUNC_MAX_ARGS 8
6949 #ifndef EXPAND_DLFUNC
6950 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6951 "is not included in this binary";
6954 #else /* EXPAND_DLFUNC */
6957 exim_dlfunc_t * func;
6960 uschar * argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6962 if (expand_forbid & RDO_DLFUNC)
6964 expand_string_message =
6965 US"dynamically-loaded functions are not permitted";
6969 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, flags,
6970 TRUE, name, &resetok, NULL))
6972 case -1: continue; /* skipping */
6973 case 1: goto EXPAND_FAILED_CURLY;
6975 case 3: goto EXPAND_FAILED;
6978 /* Look up the dynamically loaded object handle in the tree. If it isn't
6979 found, dlopen() the file and put the handle in the tree for next time. */
6981 if (!(t = tree_search(dlobj_anchor, argv[0])))
6983 void * handle = dlopen(CS argv[0], RTLD_LAZY);
6986 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6987 argv[0], dlerror());
6988 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6991 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), argv[0]);
6992 Ustrcpy(t->name, argv[0]);
6993 t->data.ptr = handle;
6994 (void)tree_insertnode(&dlobj_anchor, t);
6997 /* Having obtained the dynamically loaded object handle, look up the
6998 function pointer. */
7000 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
7002 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
7003 "%s", argv[1], argv[0], dlerror());
7004 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
7008 /* Call the function and work out what to do with the result. If it
7009 returns OK, we have a replacement string; if it returns DEFER then
7010 expansion has failed in a non-forced manner; if it returns FAIL then
7011 failure was forced; if it returns ERROR or any other value there's a
7012 problem, so panic slightly. In any case, assume that the function has
7013 side-effects on the store that must be preserved. */
7017 for (argc = 0; argv[argc]; argc++) ;
7019 if ((status = func(&result, argc - 2, &argv[2])) != OK)
7021 expand_string_message = result ? result : US"(no message)";
7022 if (status == FAIL_FORCED)
7023 f.expand_string_forcedfail = TRUE;
7024 else if (status != FAIL)
7025 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
7026 argv[0], argv[1], status, expand_string_message);
7030 if (result) yield = string_cat(yield, result);
7033 #endif /* EXPAND_DLFUNC */
7035 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
7038 uschar *save_lookup_value = lookup_value;
7040 if (Uskip_whitespace(&s) != '{') /*}*/
7043 key = expand_string_internal(s+1,
7044 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
7045 if (!key) goto EXPAND_FAILED; /*{{*/
7048 expand_string_message = US"missing '}' for name arg of env";
7049 goto EXPAND_FAILED_CURLY;
7052 lookup_value = US getenv(CS key);
7054 switch(process_yesno(
7055 flags, /* were previously skipping */
7056 lookup_value != NULL, /* success/failure indicator */
7057 save_lookup_value, /* value to reset for string2 */
7058 &s, /* input pointer */
7059 &yield, /* output pointer */
7060 US"env", /* condition type */
7063 case 1: goto EXPAND_FAILED; /* when all is well, the */
7064 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
7066 if (flags & ESI_SKIPPING) continue;
7071 case EITEM_SRS_ENCODE:
7072 /* ${srs_encode {secret} {return_path} {orig_domain}} */
7077 BOOL quoted = FALSE;
7079 switch (read_subs(sub, 3, 3, CUSS &s, flags, TRUE, name, &resetok, NULL))
7081 case -1: continue; /* skipping */
7082 case 1: goto EXPAND_FAILED_CURLY;
7084 case 3: goto EXPAND_FAILED;
7086 if (flags & ESI_SKIPPING) continue;
7088 if (sub[1] && *(sub[1]))
7090 g = string_catn(g, US"SRS0=", 5);
7092 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
7093 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
7094 g = string_catn(g, cksum, sizeof(cksum));
7095 g = string_catn(g, US"=", 1);
7097 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
7102 gettimeofday(&now, NULL);
7103 i = (now.tv_sec / 86400) & 0x3ff;
7104 g = string_catn(g, &base32_chars[i >> 5], 1);
7105 g = string_catn(g, &base32_chars[i & 0x1f], 1);
7107 g = string_catn(g, US"=", 1);
7109 /* ${domain:$return_path}=${local_part:$return_path} */
7111 int start, end, domain;
7112 uschar * t = parse_extract_address(sub[1], &expand_string_message,
7113 &start, &end, &domain, FALSE);
7119 if (domain > 0) g = string_cat(g, t + domain);
7120 g = string_catn(g, US"=", 1);
7122 s = domain > 0 ? string_copyn(t, domain - 1) : t;
7123 if ((quoted = Ustrchr(s, '"') != NULL))
7126 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
7127 while (*s) /* de-quote */
7129 while (*s && *s != '"') h = string_catn(h, s++, 1);
7131 while (*s && *s != '"') h = string_catn(h, s++, 1);
7134 gstring_release_unused(h);
7135 s = string_from_gstring(h);
7137 if (s) g = string_cat(g, s);
7140 /* Assume that if the original local_part had quotes
7141 it was for good reason */
7143 if (quoted) yield = string_catn(yield, US"\"", 1);
7144 yield = gstring_append(yield, g);
7145 if (quoted) yield = string_catn(yield, US"\"", 1);
7147 /* @$original_domain */
7148 yield = string_catn(yield, US"@", 1);
7149 yield = string_cat(yield, sub[2]);
7152 DEBUG(D_expand) debug_printf_indent("null return_path for srs-encode\n");
7156 #endif /*SUPPORT_SRS*/
7160 } /* EITEM_* switch */
7163 DEBUG(D_expand) /* only if not the sole expansion of the line */
7164 if (yield && (expansion_start > 0 || *s))
7165 debug_expansion_interim(US"item-res",
7166 yield->s + expansion_start, yield->ptr - expansion_start,
7173 /* Control reaches here if the name is not recognized as one of the more
7174 complicated expansion items. Check for the "operator" syntax (name terminated
7175 by a colon). Some of the operators have arguments, separated by _ from the
7181 uschar * arg = NULL, * sub;
7183 var_entry * vp = NULL;
7186 /* Owing to an historical mis-design, an underscore may be part of the
7187 operator name, or it may introduce arguments. We therefore first scan the
7188 table of names that contain underscores. If there is no match, we cut off
7189 the arguments and then scan the main table. */
7191 if ((c = chop_match(name, op_table_underscore,
7192 nelem(op_table_underscore))) < 0)
7194 if ((arg = Ustrchr(name, '_')))
7196 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7197 c += nelem(op_table_underscore);
7198 if (arg) *arg++ = '_'; /* Put back for error messages */
7201 /* Deal specially with operators that might take a certificate variable
7202 as we do not want to do the usual expansion. For most, expand the string.*/
7213 const uschar * s1 = s;
7214 sub = expand_string_internal(s+2,
7215 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s1, &resetok, NULL);
7216 if (!sub) goto EXPAND_FAILED; /*{*/
7219 expand_string_message =
7220 string_sprintf("missing '}' closing cert arg of %s", name);
7221 goto EXPAND_FAILED_CURLY;
7223 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7233 sub = expand_string_internal(s+1,
7234 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
7235 if (!sub) goto EXPAND_FAILED;
7240 /* If we are skipping, we don't need to perform the operation at all.
7241 This matters for operations like "mask", because the data may not be
7242 in the correct format when skipping. For example, the expression may test
7243 for the existence of $sender_host_address before trying to mask it. For
7244 other operations, doing them may not fail, but it is a waste of time. */
7246 if (flags & ESI_SKIPPING && c >= 0) continue;
7248 /* Otherwise, switch on the operator type. After handling go back
7249 to the main loop top. */
7252 unsigned expansion_start = gstring_length(yield);
7258 unsigned long int n = Ustrtoul(sub, &t, 10);
7263 expand_string_message = string_sprintf("argument for base32 "
7264 "operator is \"%s\", which is not a decimal number", sub);
7268 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7270 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7277 unsigned long int n = 0;
7280 uschar * t = Ustrchr(base32_chars, *tt++);
7283 expand_string_message = string_sprintf("argument for base32d "
7284 "operator is \"%s\", which is not a base 32 number", sub);
7287 n = n * 32 + (t - base32_chars);
7289 yield = string_fmt_append(yield, "%ld", n);
7296 unsigned long int n = Ustrtoul(sub, &t, 10);
7299 expand_string_message = string_sprintf("argument for base62 "
7300 "operator is \"%s\", which is not a decimal number", sub);
7303 yield = string_cat(yield, string_base62_32(n)); /*XXX only handles 32b input range. Need variants? */
7307 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7312 unsigned long int n = 0;
7315 uschar *t = Ustrchr(base62_chars, *tt++);
7318 expand_string_message = string_sprintf("argument for base62d "
7319 "operator is \"%s\", which is not a base %d number", sub,
7323 n = n * BASE_62 + (t - base62_chars);
7325 yield = string_fmt_append(yield, "%ld", n);
7331 uschar *expanded = expand_string_internal(sub,
7332 ESI_HONOR_DOLLAR | flags & ESI_SKIPPING, NULL, &resetok, NULL);
7335 expand_string_message =
7336 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7337 expand_string_message);
7340 yield = string_cat(yield, expanded);
7346 uschar * t = sub - 1;
7347 while (*++t) *t = tolower(*t);
7348 yield = string_catn(yield, sub, t-sub);
7354 uschar * t = sub - 1;
7355 while (*++t) *t = toupper(*t);
7356 yield = string_catn(yield, sub, t-sub);
7362 if (vp && *(void **)vp->value)
7364 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7365 yield = string_cat(yield, cp);
7373 md5_end(&base, sub, Ustrlen(sub), digest);
7374 for (int j = 0; j < 16; j++)
7375 yield = string_fmt_append(yield, "%02x", digest[j]);
7381 if (vp && *(void **)vp->value)
7383 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7384 yield = string_cat(yield, cp);
7392 sha1_end(&h, sub, Ustrlen(sub), digest);
7393 for (int j = 0; j < 20; j++)
7394 yield = string_fmt_append(yield, "%02X", digest[j]);
7400 #ifdef EXIM_HAVE_SHA2
7401 if (vp && *(void **)vp->value)
7402 if (c == EOP_SHA256)
7403 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7405 expand_string_message = US"sha2_N not supported with certificates";
7410 hashmethod m = !arg ? HASH_SHA2_256
7411 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7412 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7413 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7416 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7418 expand_string_message = US"unrecognised sha2 variant";
7422 exim_sha_update_string(&h, sub);
7423 exim_sha_finish(&h, &b);
7425 yield = string_fmt_append(yield, "%02X", *b.data++);
7428 expand_string_message = US"sha256 only supported with TLS";
7433 #ifdef EXIM_HAVE_SHA3
7437 hashmethod m = !arg ? HASH_SHA3_256
7438 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7439 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7440 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7441 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7444 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7446 expand_string_message = US"unrecognised sha3 variant";
7450 exim_sha_update_string(&h, sub);
7451 exim_sha_finish(&h, &b);
7453 yield = string_fmt_append(yield, "%02X", *b.data++);
7457 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7461 /* Line-wrap a string as if it is a header line */
7463 case EOP_HEADERWRAP:
7465 unsigned col = 80, lim = 998;
7470 const uschar * list = arg;
7472 if ((s = string_nextinlist(&list, &sep, NULL, 0)))
7475 if ((s = string_nextinlist(&list, &sep, NULL, 0)))
7479 if ((s = wrap_header(sub, col, lim, US"\t", 8)))
7480 yield = string_cat(yield, s);
7484 /* Convert hex encoding to base64 encoding */
7494 for (enc = sub; *enc; enc++)
7496 if (!isxdigit(*enc))
7498 expand_string_message = string_sprintf("\"%s\" is not a hex "
7507 expand_string_message = string_sprintf("\"%s\" contains an odd "
7508 "number of characters", sub);
7512 while ((c = *in++) != 0)
7514 if (isdigit(c)) c -= '0';
7515 else c = toupper(c) - 'A' + 10;
7525 enc = b64encode(CUS sub, out - sub);
7526 yield = string_cat(yield, enc);
7530 /* Convert octets outside 0x21..0x7E to \xXX form */
7534 uschar *t = sub - 1;
7537 if (*t < 0x21 || 0x7E < *t)
7538 yield = string_fmt_append(yield, "\\x%02x", *t);
7540 yield = string_catn(yield, t, 1);
7545 /* count the number of list elements */
7549 int cnt = 0, sep = 0;
7550 uschar * buf = store_get(2, sub);
7552 while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++;
7553 yield = string_fmt_append(yield, "%d", cnt);
7557 /* expand a named list given the name */
7558 /* handles nested named lists; requotes as colon-sep list */
7561 expand_string_message = NULL;
7562 yield = expand_listnamed(yield, sub, arg);
7563 if (expand_string_message)
7567 /* quote a list-item for the given list-separator */
7569 /* mask applies a mask to an IP address; for example the result of
7570 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7577 int type, mask, maskoffset;
7581 if ((type = string_is_ip_address(sub, &maskoffset)) == 0)
7583 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7588 if (maskoffset == 0)
7590 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7595 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7597 if (*endptr || mask < 0 || mask > (type == 4 ? 32 : 128))
7599 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7604 /* If an optional 'n' was given, ipv6 gets normalised output:
7605 colons rather than dots, and zero-compressed. */
7607 normalised = arg && *arg == 'n';
7609 /* Convert the address to binary integer(s) and apply the mask */
7611 sub[maskoffset] = 0;
7612 count = host_aton(sub, binary);
7613 host_mask(count, binary, mask);
7615 /* Convert to masked textual format and add to output. */
7617 if (type == 4 || !normalised)
7618 yield = string_catn(yield, buffer,
7619 host_nmtoa(count, binary, mask, buffer, '.'));
7622 ipv6_nmtoa(binary, buffer);
7623 yield = string_fmt_append(yield, "%s/%d", buffer, mask);
7629 case EOP_IPV6DENORM:
7631 int type = string_is_ip_address(sub, NULL);
7638 (void) host_aton(sub, binary);
7641 case 4: /* convert to IPv4-mapped IPv6 */
7642 binary[0] = binary[1] = 0;
7643 binary[2] = 0x0000ffff;
7644 (void) host_aton(sub, binary+3);
7648 expand_string_message =
7649 string_sprintf("\"%s\" is not an IP address", sub);
7653 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7654 ? ipv6_nmtoa(binary, buffer)
7655 : host_nmtoa(4, binary, -1, buffer, ':')
7661 case EOP_LOCAL_PART:
7665 int start, end, domain;
7666 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7669 if (c != EOP_DOMAIN)
7670 yield = c == EOP_LOCAL_PART && domain > 0
7671 ? string_catn(yield, t, domain - 1)
7672 : string_cat(yield, t);
7673 else if (domain > 0)
7674 yield = string_cat(yield, t + domain);
7680 uschar outsep[2] = { ':', '\0' };
7681 uschar *address, *error;
7682 int save_ptr = gstring_length(yield);
7683 int start, end, domain; /* Not really used */
7685 if (Uskip_whitespace(&sub) == '>')
7686 if (*outsep = *++sub) ++sub;
7689 expand_string_message = string_sprintf("output separator "
7690 "missing in expanding ${addresses:%s}", --sub);
7693 f.parse_allow_group = TRUE;
7697 uschar * p = parse_find_address_end(sub, FALSE);
7698 uschar saveend = *p;
7700 address = parse_extract_address(sub, &error, &start, &end, &domain,
7704 /* Add the address to the output list that we are building. This is
7705 done in chunks by searching for the separator character. At the
7706 start, unless we are dealing with the first address of the output
7707 list, add in a space if the new address begins with the separator
7708 character, or is an empty string. */
7712 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7713 yield = string_catn(yield, US" ", 1);
7717 size_t seglen = Ustrcspn(address, outsep);
7718 yield = string_catn(yield, address, seglen + 1);
7720 /* If we got to the end of the string we output one character
7723 if (address[seglen] == '\0') { yield->ptr--; break; }
7724 yield = string_catn(yield, outsep, 1);
7725 address += seglen + 1;
7728 /* Output a separator after the string: we will remove the
7729 redundant final one at the end. */
7731 yield = string_catn(yield, outsep, 1);
7734 if (saveend == '\0') break;
7738 /* If we have generated anything, remove the redundant final
7741 if (yield && yield->ptr != save_ptr) yield->ptr--;
7742 f.parse_allow_group = FALSE;
7747 /* quote puts a string in quotes if it is empty or contains anything
7748 other than alphamerics, underscore, dot, or hyphen.
7750 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7751 be quoted in order to be a valid local part.
7753 In both cases, newlines and carriage returns are converted into \n and \r
7757 case EOP_QUOTE_LOCAL_PART:
7760 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7761 uschar *t = sub - 1;
7764 while (!needs_quote && *++t)
7765 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7767 else /* EOP_QUOTE_LOCAL_PART */
7768 while (!needs_quote && *++t)
7769 needs_quote = !isalnum(*t)
7770 && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL
7771 && (*t != '.' || t == sub || !t[1]);
7775 yield = string_catn(yield, US"\"", 1);
7779 yield = string_catn(yield, US"\\n", 2);
7780 else if (*t == '\r')
7781 yield = string_catn(yield, US"\\r", 2);
7784 if (*t == '\\' || *t == '"')
7785 yield = string_catn(yield, US"\\", 1);
7786 yield = string_catn(yield, t, 1);
7788 yield = string_catn(yield, US"\"", 1);
7791 yield = string_cat(yield, sub);
7794 /* quote_lookuptype does lookup-specific quoting */
7799 uschar * opt = Ustrchr(arg, '_');
7801 if (opt) *opt++ = 0;
7803 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7805 expand_string_message = search_error_message;
7809 if (lookup_list[n]->quote)
7810 sub = (lookup_list[n]->quote)(sub, opt, (unsigned)n);
7816 expand_string_message = string_sprintf(
7817 "\"%s\" unrecognized after \"${quote_%s\"", /*}*/
7822 yield = string_cat(yield, sub);
7826 /* rx quote sticks in \ before any non-alphameric character so that
7827 the insertion works in a regular expression. */
7831 uschar *t = sub - 1;
7835 yield = string_catn(yield, US"\\", 1);
7836 yield = string_catn(yield, t, 1);
7841 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7842 prescribed by the RFC, if there are characters that need to be encoded */
7845 yield = string_cat(yield,
7846 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7850 /* RFC 2047 decode */
7856 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7857 headers_charset, '?', &len, &error);
7860 expand_string_message = error;
7863 yield = string_catn(yield, decoded, len);
7867 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7872 uschar * buff = store_get(4, sub);
7877 if (c > 255) c = '_';
7879 yield = string_catn(yield, buff, 1);
7884 /* replace illegal UTF-8 sequences by replacement character */
7886 #define UTF8_REPLACEMENT_CHAR US"?"
7890 int seq_len = 0, index = 0, bytes_left = 0, complete;
7891 u_long codepoint = (u_long)-1;
7892 uschar seq_buff[4]; /* accumulate utf-8 here */
7894 /* Manually track tainting, as we deal in individual chars below */
7897 yield = string_get_tainted(Ustrlen(sub), sub);
7898 else if (!yield->s || !yield->ptr)
7900 yield->s = store_get(yield->size = Ustrlen(sub), sub);
7901 gstring_reset(yield);
7903 else if (is_incompatible(yield->s, sub))
7904 gstring_rebuffer(yield, sub);
7906 /* Check the UTF-8, byte-by-byte */
7915 if ((c & 0xc0) != 0x80)
7916 /* wrong continuation byte; invalidate all bytes */
7917 complete = 1; /* error */
7920 codepoint = (codepoint << 6) | (c & 0x3f);
7921 seq_buff[index++] = c;
7922 if (--bytes_left == 0) /* codepoint complete */
7923 if(codepoint > 0x10FFFF) /* is it too large? */
7924 complete = -1; /* error (RFC3629 limit) */
7925 else if ( (codepoint & 0x1FF800 ) == 0xD800 ) /* surrogate */
7926 /* A UTF-16 surrogate (which should be one of a pair that
7927 encode a Unicode codepoint that is outside the Basic
7928 Multilingual Plane). Error, not UTF8.
7929 RFC2279.2 is slightly unclear on this, but
7930 https://unicodebook.readthedocs.io/issues.html#strict-utf8-decoder
7931 says "Surrogates characters are also invalid in UTF-8:
7932 characters in U+D800—U+DFFF have to be rejected." */
7935 { /* finished; output utf-8 sequence */
7936 yield = string_catn(yield, seq_buff, seq_len);
7941 else /* no bytes left: new sequence */
7943 if (!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7945 yield = string_catn(yield, &c, 1);
7948 if ((c & 0xe0) == 0xc0) /* 2-byte sequence */
7949 if (c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7954 codepoint = c & 0x1f;
7956 else if ((c & 0xf0) == 0xe0) /* 3-byte sequence */
7959 codepoint = c & 0x0f;
7961 else if ((c & 0xf8) == 0xf0) /* 4-byte sequence */
7964 codepoint = c & 0x07;
7966 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7969 seq_buff[index++] = c;
7970 seq_len = bytes_left + 1;
7971 } /* if(bytes_left) */
7975 bytes_left = index = 0;
7976 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7978 if ((complete == 1) && ((c & 0x80) == 0))
7979 /* ASCII character follows incomplete sequence */
7980 yield = string_catn(yield, &c, 1);
7982 /* If given a sequence truncated mid-character, we also want to report ?
7983 Eg, ${length_1:フィル} is one byte, not one character, so we expect
7984 ${utf8clean:${length_1:フィル}} to yield '?' */
7986 if (bytes_left != 0)
7987 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7993 case EOP_UTF8_DOMAIN_TO_ALABEL:
7995 uschar * error = NULL;
7996 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7999 expand_string_message = string_sprintf(
8000 "error converting utf8 (%s) to alabel: %s",
8001 string_printing(sub), error);
8004 yield = string_cat(yield, s);
8008 case EOP_UTF8_DOMAIN_FROM_ALABEL:
8010 uschar * error = NULL;
8011 uschar * s = string_domain_alabel_to_utf8(sub, &error);
8014 expand_string_message = string_sprintf(
8015 "error converting alabel (%s) to utf8: %s",
8016 string_printing(sub), error);
8019 yield = string_cat(yield, s);
8023 case EOP_UTF8_LOCALPART_TO_ALABEL:
8025 uschar * error = NULL;
8026 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
8029 expand_string_message = string_sprintf(
8030 "error converting utf8 (%s) to alabel: %s",
8031 string_printing(sub), error);
8034 yield = string_cat(yield, s);
8035 DEBUG(D_expand) debug_printf_indent("yield: '%Y'\n", yield);
8039 case EOP_UTF8_LOCALPART_FROM_ALABEL:
8041 uschar * error = NULL;
8042 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
8045 expand_string_message = string_sprintf(
8046 "error converting alabel (%s) to utf8: %s",
8047 string_printing(sub), error);
8050 yield = string_cat(yield, s);
8053 #endif /* EXPERIMENTAL_INTERNATIONAL */
8055 /* escape turns all non-printing characters into escape sequences. */
8059 const uschar * t = string_printing(sub);
8060 yield = string_cat(yield, t);
8064 case EOP_ESCAPE8BIT:
8068 for (const uschar * s = sub; (c = *s); s++)
8069 yield = c < 127 && c != '\\'
8070 ? string_catn(yield, s, 1)
8071 : string_fmt_append(yield, "\\%03o", c);
8075 /* Handle numeric expression evaluation */
8080 uschar *save_sub = sub;
8081 uschar *error = NULL;
8082 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
8085 expand_string_message = string_sprintf("error in expression "
8086 "evaluation: %s (after processing \"%.*s\")", error,
8087 (int)(sub-save_sub), save_sub);
8090 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
8094 /* Handle time period formatting */
8098 int n = readconf_readtime(sub, 0, FALSE);
8101 expand_string_message = string_sprintf("string \"%s\" is not an "
8102 "Exim time interval in \"%s\" operator", sub, name);
8105 yield = string_fmt_append(yield, "%d", n);
8109 case EOP_TIME_INTERVAL:
8112 uschar *t = read_number(&n, sub);
8113 if (*t != 0) /* Not A Number*/
8115 expand_string_message = string_sprintf("string \"%s\" is not a "
8116 "positive number in \"%s\" operator", sub, name);
8119 t = readconf_printtime(n);
8120 yield = string_cat(yield, t);
8124 /* Convert string to base64 encoding */
8130 uschar * s = vp && *(void **)vp->value
8131 ? tls_cert_der_b64(*(void **)vp->value)
8132 : b64encode(CUS sub, Ustrlen(sub));
8134 uschar * s = b64encode(CUS sub, Ustrlen(sub));
8136 yield = string_cat(yield, s);
8143 int len = b64decode(sub, &s, sub);
8146 expand_string_message = string_sprintf("string \"%s\" is not "
8147 "well-formed for \"%s\" operator", sub, name);
8150 yield = string_cat(yield, s);
8154 /* strlen returns the length of the string */
8157 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
8160 /* length_n or l_n takes just the first n characters or the whole string,
8161 whichever is the shorter;
8163 substr_m_n, and s_m_n take n characters from offset m; negative m take
8164 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
8165 takes the rest, either to the right or to the left.
8167 hash_n or h_n makes a hash of length n from the string, yielding n
8168 characters from the set a-z; hash_n_m makes a hash of length n, but
8169 uses m characters from the set a-zA-Z0-9.
8171 nhash_n returns a single number between 0 and n-1 (in text form), while
8172 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
8173 between 0 and n-1 and the second between 0 and m-1. */
8193 expand_string_message = string_sprintf("missing values after %s",
8198 /* "length" has only one argument, effectively being synonymous with
8201 if (c == EOP_LENGTH || c == EOP_L)
8207 /* The others have one or two arguments; for "substr" the first may be
8208 negative. The second being negative means "not supplied". */
8213 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8216 /* Read up to two numbers, separated by underscores */
8221 if (arg != ret && *arg == '_' && pn == &value1)
8225 if (arg[1] != 0) arg++;
8227 else if (!isdigit(*arg))
8229 expand_string_message =
8230 string_sprintf("non-digit after underscore in \"%s\"", name);
8233 else *pn = (*pn)*10 + *arg++ - '0';
8237 /* Perform the required operation */
8239 ret = c == EOP_HASH || c == EOP_H
8240 ? compute_hash(sub, value1, value2, &len)
8241 : c == EOP_NHASH || c == EOP_NH
8242 ? compute_nhash(sub, value1, value2, &len)
8243 : extract_substr(sub, value1, value2, &len);
8244 if (!ret) goto EXPAND_FAILED;
8246 yield = string_catn(yield, ret, len);
8255 uschar **modetable[3];
8259 if (expand_forbid & RDO_EXISTS)
8261 expand_string_message = US"Use of the stat() expansion is not permitted";
8265 if (stat(CS sub, &st) < 0)
8267 expand_string_message = string_sprintf("stat(%s) failed: %s",
8268 sub, strerror(errno));
8272 switch (mode & S_IFMT)
8274 case S_IFIFO: smode[0] = 'p'; break;
8275 case S_IFCHR: smode[0] = 'c'; break;
8276 case S_IFDIR: smode[0] = 'd'; break;
8277 case S_IFBLK: smode[0] = 'b'; break;
8278 case S_IFREG: smode[0] = '-'; break;
8279 default: smode[0] = '?'; break;
8282 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8283 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8284 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8286 for (int i = 0; i < 3; i++)
8288 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8293 yield = string_fmt_append(yield,
8294 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8295 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8296 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8297 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8298 (long)st.st_gid, st.st_size, (long)st.st_atime,
8299 (long)st.st_mtime, (long)st.st_ctime);
8303 /* vaguely random number less than N */
8307 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8309 if (expand_string_message)
8311 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8315 /* Reverse IP, including IPv6 to dotted-nibble */
8317 case EOP_REVERSE_IP:
8319 int family, maskptr;
8320 uschar reversed[128];
8322 family = string_is_ip_address(sub, &maskptr);
8325 expand_string_message = string_sprintf(
8326 "reverse_ip() not given an IP address [%s]", sub);
8329 invert_address(reversed, sub);
8330 yield = string_cat(yield, reversed);
8337 int len = xtextdecode(sub, &s);
8338 yield = string_catn(yield, s, len);
8342 /* Unknown operator */
8344 expand_string_message =
8345 string_sprintf("unknown expansion operator \"%s\"", name);
8347 } /* EOP_* switch */
8351 const uschar * res = string_from_gstring(yield);
8352 const uschar * s = res + expansion_start;
8353 int i = gstring_length(yield) - expansion_start;
8354 BOOL tainted = is_tainted(s);
8356 debug_printf_indent("%Vop-res: %.*s\n", "K-----", i, s);
8359 debug_printf_indent("%V %V",
8360 flags & ESI_SKIPPING ? "|" : " ",
8362 debug_print_taint(res);
8369 /* Not an item or an operator */
8370 /* Handle a plain name. If this is the first thing in the expansion, release
8371 the pre-allocated buffer. If the result data is known to be in a new buffer,
8372 newsize will be set to the size of that buffer, and we can just point at that
8373 store instead of copying. Many expansion strings contain just one reference,
8374 so this is a useful optimization, especially for humungous headers
8375 ($message_headers). */
8379 const uschar * value;
8385 g = store_get(sizeof(gstring), GET_UNTAINTED);
8386 else if (yield->ptr == 0)
8388 if (resetok) reset_point = store_reset(reset_point);
8390 reset_point = store_mark();
8391 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
8393 if (!(value = find_variable(name, flags, &newsize)))
8395 expand_string_message =
8396 string_sprintf("unknown variable in \"${%s}\"", name);
8397 check_variable_error_message(name);
8400 len = Ustrlen(value);
8401 if (!yield && newsize)
8404 yield->size = newsize;
8406 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
8409 yield = string_catn(yield, value, len);
8413 /* Else there's something wrong */
8415 expand_string_message =
8416 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8417 "in a variable reference)", name);
8421 /* If we hit the end of the string when brace_ends is set, there is a missing
8422 terminating brace. */
8424 if (flags & ESI_BRACE_ENDS && !*s)
8426 expand_string_message = malformed_header
8427 ? US"missing } at end of string - could be header name not terminated by colon"
8428 : US"missing } at end of string";
8432 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8433 added to the string. If so, set up an empty string. Add a terminating zero. If
8434 left != NULL, return a pointer to the terminator. */
8440 yield = string_get(1);
8441 res = string_from_gstring(yield);
8442 if (left) *left = s;
8444 /* Any stacking store that was used above the final string is no longer needed.
8445 In many cases the final string will be the first one that was got and so there
8446 will be optimal store usage. */
8448 if (resetok) gstring_release_unused(yield);
8449 else if (resetok_p) *resetok_p = FALSE;
8453 BOOL tainted = is_tainted(res);
8454 debug_printf_indent("%Vexpanded: %.*W\n",
8456 (int)(s - string), string);
8457 debug_printf_indent("%Vresult: ",
8458 flags & ESI_SKIPPING ? "K-----" : "\\_____");
8459 if (*res || !(flags & ESI_SKIPPING))
8460 debug_printf("%W\n", res);
8462 debug_printf(" %Vskipped%V\n", "<", ">");
8465 debug_printf_indent("%V %V",
8466 flags & ESI_SKIPPING ? "|" : " ",
8469 debug_print_taint(res);
8471 if (flags & ESI_SKIPPING)
8472 debug_printf_indent("%Vskipping: result is not used\n", "\\___");
8474 if (textonly_p) *textonly_p = textonly;
8479 /* This is the failure exit: easiest to program with a goto. We still need
8480 to update the pointer to the terminator, for cases of nested calls with "fail".
8483 EXPAND_FAILED_CURLY:
8484 if (malformed_header)
8485 expand_string_message =
8486 US"missing or misplaced { or } - could be header name not terminated by colon";
8488 else if (!expand_string_message || !*expand_string_message)
8489 expand_string_message = US"missing or misplaced { or }";
8491 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8492 that is a bad idea, because expand_string_message is in dynamic store. */
8495 if (left) *left = s;
8498 debug_printf_indent("%Vfailed to expand: %s\n", "K", string);
8499 debug_printf_indent("%Verror message: %s\n",
8500 f.expand_string_forcedfail ? "K---" : "\\___", expand_string_message);
8501 if (f.expand_string_forcedfail)
8502 debug_printf_indent("%Vfailure was forced\n", "\\");
8504 if (resetok_p && !resetok) *resetok_p = FALSE;
8511 /* This is the external function call. Do a quick check for any expansion
8512 metacharacters, and if there are none, just return the input string.
8515 the string to be expanded
8516 optional pointer for return boolean indicating no-dynamic-expansions
8518 Returns: the expanded string, or NULL if expansion failed; if failure was
8519 due to a lookup deferring, search_find_defer will be TRUE
8523 expand_string_2(const uschar * string, BOOL * textonly_p)
8525 f.expand_string_forcedfail = f.search_find_defer = malformed_header = FALSE;
8526 if (Ustrpbrk(string, "$\\") != NULL)
8528 int old_pool = store_pool;
8531 store_pool = POOL_MAIN;
8532 s = expand_string_internal(string, ESI_HONOR_DOLLAR, NULL, NULL, textonly_p);
8533 store_pool = old_pool;
8536 if (textonly_p) *textonly_p = TRUE;
8541 expand_cstring(const uschar * string)
8542 { return expand_string_2(string, NULL); }
8545 expand_string(uschar * string)
8546 { return US expand_string_2(CUS string, NULL); }
8553 /*************************************************
8555 *************************************************/
8557 /* Now and again we want to expand a string and be sure that the result is in a
8558 new bit of store. This function does that.
8559 Since we know it has been copied, the de-const cast is safe.
8561 Argument: the string to be expanded
8562 Returns: the expanded string, always in a new bit of store, or NULL
8566 expand_string_copy(const uschar *string)
8568 const uschar *yield = expand_cstring(string);
8569 if (yield == string) yield = string_copy(string);
8575 /*************************************************
8576 * Expand and interpret as an integer *
8577 *************************************************/
8579 /* Expand a string, and convert the result into an integer.
8582 string the string to be expanded
8583 isplus TRUE if a non-negative number is expected
8585 Returns: the integer value, or
8586 -1 for an expansion error ) in both cases, message in
8587 -2 for an integer interpretation error ) expand_string_message
8588 expand_string_message is set NULL for an OK integer
8592 expand_string_integer(uschar *string, BOOL isplus)
8594 return expanded_string_integer(expand_string(string), isplus);
8598 /*************************************************
8599 * Interpret string as an integer *
8600 *************************************************/
8602 /* Convert a string (that has already been expanded) into an integer.
8604 This function is used inside the expansion code.
8607 s the string to be expanded
8608 isplus TRUE if a non-negative number is expected
8610 Returns: the integer value, or
8611 -1 if string is NULL (which implies an expansion error)
8612 -2 for an integer interpretation error
8613 expand_string_message is set NULL for an OK integer
8616 static int_eximarith_t
8617 expanded_string_integer(const uschar *s, BOOL isplus)
8619 int_eximarith_t value;
8620 uschar *msg = US"invalid integer \"%s\"";
8623 /* If expansion failed, expand_string_message will be set. */
8627 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8628 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8629 systems, so we set it zero ourselves. */
8632 expand_string_message = NULL; /* Indicates no error */
8634 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8635 equal to 0. Unfortunately, people actually relied upon that, so preserve
8636 the behaviour explicitly. Stripping leading whitespace is a harmless
8637 noop change since strtol skips it anyway (provided that there is a number
8640 if (Uskip_whitespace(&s) == '\0')
8643 debug_printf_indent("treating blank string as number 0\n");
8647 value = strtoll(CS s, CSS &endptr, 10);
8650 msg = US"integer expected but \"%s\" found";
8651 else if (value < 0 && isplus)
8652 msg = US"non-negative integer expected but \"%s\" found";
8655 switch (tolower(*endptr))
8660 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8665 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8666 else value *= 1024*1024;
8670 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8671 else value *= 1024*1024*1024;
8675 if (errno == ERANGE)
8676 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8678 if (Uskip_whitespace(&endptr) == 0) return value;
8681 expand_string_message = string_sprintf(CS msg, s);
8686 /* These values are usually fixed boolean values, but they are permitted to be
8690 addr address being routed
8691 mtype the module type
8692 mname the module name
8693 dbg_opt debug selectors
8694 oname the option name
8695 bvalue the router's boolean value
8696 svalue the router's string value
8697 rvalue where to put the returned value
8699 Returns: OK value placed in rvalue
8700 DEFER expansion failed
8704 exp_bool(address_item * addr,
8705 const uschar * mtype, const uschar * mname, unsigned dbg_opt,
8706 uschar * oname, BOOL bvalue,
8707 const uschar * svalue, BOOL * rvalue)
8709 const uschar * expanded;
8711 DEBUG(D_expand) debug_printf("try option %s\n", oname);
8712 if (!svalue) { *rvalue = bvalue; return OK; }
8714 if (!(expanded = expand_cstring(svalue)))
8716 if (f.expand_string_forcedfail)
8718 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8722 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8723 oname, mname, mtype, expand_string_message);
8724 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8728 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8731 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8733 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8737 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8738 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8747 /* Avoid potentially exposing a password in a string about to be logged */
8750 expand_hide_passwords(uschar * s)
8752 return ( ( Ustrstr(s, "failed to expand") != NULL
8753 || Ustrstr(s, "expansion of ") != NULL
8755 && ( Ustrstr(s, "mysql") != NULL
8756 || Ustrstr(s, "pgsql") != NULL
8757 || Ustrstr(s, "redis") != NULL
8758 || Ustrstr(s, "sqlite") != NULL
8759 || Ustrstr(s, "ldap:") != NULL
8760 || Ustrstr(s, "ldaps:") != NULL
8761 || Ustrstr(s, "ldapi:") != NULL
8762 || Ustrstr(s, "ldapdn:") != NULL
8763 || Ustrstr(s, "ldapm:") != NULL
8765 ? US"Temporary internal error" : s;
8769 /* Read given named file into big_buffer. Use for keying material etc.
8770 The content will have an ascii NUL appended.
8775 Return: pointer to buffer, or NULL on error.
8779 expand_file_big_buffer(const uschar * filename)
8781 int fd, off = 0, len;
8783 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8785 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8792 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8795 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8803 big_buffer[off] = '\0';
8809 /*************************************************
8810 * Error-checking for testsuite *
8811 *************************************************/
8813 uschar * region_start;
8814 uschar * region_end;
8815 const uschar *var_name;
8816 const uschar *var_data;
8819 /* Called via tree_walk, which allows nonconst name/data. Our usage is const. */
8821 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8824 if (var_data >= e->region_start && var_data < e->region_end)
8826 e->var_name = CUS var_name;
8827 e->var_data = CUS var_data;
8832 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8834 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8835 .var_name = NULL, .var_data = NULL };
8837 /* check acl_ variables */
8838 tree_walk(acl_var_c, assert_variable_notin, &e);
8839 tree_walk(acl_var_m, assert_variable_notin, &e);
8841 /* check auth<n> variables.
8842 assert_variable_notin() treats as const, so deconst is safe. */
8843 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8844 assert_variable_notin(US"auth<n>", US auth_vars[i], &e);
8846 #ifdef WITH_CONTENT_SCAN
8847 /* check regex<n> variables. assert_variable_notin() treats as const. */
8848 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8849 assert_variable_notin(US"regex<n>", US regex_vars[i], &e);
8852 /* check known-name variables */
8853 for (var_entry * v = var_table; v < var_table + nelem(var_table); v++)
8854 if (v->type == vtype_stringptr)
8855 assert_variable_notin(US v->name, *(USS v->value), &e);
8857 /* check dns and address trees */
8858 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8859 tree_walk(tree_duplicates, assert_variable_notin, &e);
8860 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8861 tree_walk(tree_unusable, assert_variable_notin, &e);
8864 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8865 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8866 e.var_name, filename, linenumber, e.var_data);
8871 /*************************************************
8872 **************************************************
8873 * Stand-alone test program *
8874 **************************************************
8875 *************************************************/
8881 regex_match_and_setup(const pcre2_code *re, uschar *subject, int options, int setup)
8883 int ovec[3*(EXPAND_MAXN+1)];
8884 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8886 BOOL yield = n >= 0;
8887 if (n == 0) n = EXPAND_MAXN + 1;
8890 expand_nmax = setup < 0 ? 0 : setup + 1;
8891 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8893 expand_nstring[expand_nmax] = subject + ovec[nn];
8894 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
8902 int main(int argc, uschar **argv)
8904 uschar buffer[1024];
8906 debug_selector = D_v;
8907 debug_file = stderr;
8908 debug_fd = fileno(debug_file);
8909 big_buffer = malloc(big_buffer_size);
8912 for (int i = 1; i < argc; i++)
8914 if (argv[i][0] == '+')
8916 debug_trace_memory = 2;
8919 if (isdigit(argv[i][0]))
8920 debug_selector = Ustrtol(argv[i], NULL, 0);
8922 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8926 eldap_default_servers = argv[i];
8929 mysql_servers = argv[i];
8932 pgsql_servers = argv[i];
8935 redis_servers = argv[i];
8939 else opt_perl_startup = argv[i];
8943 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8945 expand_nstring[1] = US"string 1....";
8946 expand_nlength[1] = 8;
8950 if (opt_perl_startup != NULL)
8953 printf("Starting Perl interpreter\n");
8954 errstr = init_perl(opt_perl_startup);
8957 printf("** error in perl_startup code: %s\n", errstr);
8958 return EXIT_FAILURE;
8961 #endif /* EXIM_PERL */
8963 /* Thie deliberately regards the input as untainted, so that it can be
8964 expanded; only reasonable since this is a test for string-expansions. */
8966 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8968 rmark reset_point = store_mark();
8969 uschar *yield = expand_string(buffer);
8971 printf("%s\n", yield);
8974 if (f.search_find_defer) printf("search_find deferred\n");
8975 printf("Failed: %s\n", expand_string_message);
8976 if (f.expand_string_forcedfail) printf("Forced failure\n");
8979 store_reset(reset_point);
8987 #endif /*STAND_ALONE*/
8989 #endif /*!MACRO_PREDEF*/
8992 /* End of expand.c */