1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* Functions for handling string expansion. */
14 /* Recursively called function */
16 static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *);
17 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
20 # ifndef SUPPORT_CRYPTEQ
21 # define SUPPORT_CRYPTEQ
26 # include "lookups/ldap.h"
29 #ifdef SUPPORT_CRYPTEQ
34 extern char* crypt16(char*, char*);
38 /* The handling of crypt16() is a mess. I will record below the analysis of the
39 mess that was sent to me. We decided, however, to make changing this very low
40 priority, because in practice people are moving away from the crypt()
41 algorithms nowadays, so it doesn't seem worth it.
44 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
45 the first 8 characters of the password using a 20-round version of crypt
46 (standard crypt does 25 rounds). It then crypts the next 8 characters,
47 or an empty block if the password is less than 9 characters, using a
48 20-round version of crypt and the same salt as was used for the first
49 block. Characters after the first 16 are ignored. It always generates
50 a 16-byte hash, which is expressed together with the salt as a string
51 of 24 base 64 digits. Here are some links to peruse:
53 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
54 http://seclists.org/bugtraq/1999/Mar/0076.html
56 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
57 and OSF/1. This is the same as the standard crypt if given a password
58 of 8 characters or less. If given more, it first does the same as crypt
59 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
60 using as salt the first two base 64 digits from the first hash block.
61 If the password is more than 16 characters then it crypts the 17th to 24th
62 characters using as salt the first two base 64 digits from the second hash
63 block. And so on: I've seen references to it cutting off the password at
64 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
66 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
67 http://seclists.org/bugtraq/1999/Mar/0109.html
68 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
69 TET1_html/sec.c222.html#no_id_208
71 Exim has something it calls "crypt16". It will either use a native
72 crypt16 or its own implementation. A native crypt16 will presumably
73 be the one that I called "crypt16" above. The internal "crypt16"
74 function, however, is a two-block-maximum implementation of what I called
75 "bigcrypt". The documentation matches the internal code.
77 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
78 that crypt16 and bigcrypt were different things.
80 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
81 to whatever it is using under that name. This unfortunately sets a
82 precedent for using "{crypt16}" to identify two incompatible algorithms
83 whose output can't be distinguished. With "{crypt16}" thus rendered
84 ambiguous, I suggest you deprecate it and invent two new identifiers
85 for the two algorithms.
87 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
88 of the password separately means they can be cracked separately, so
89 the double-length hash only doubles the cracking effort instead of
90 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
97 /*************************************************
98 * Local statics and tables *
99 *************************************************/
101 /* Table of item names, and corresponding switch numbers. The names must be in
102 alphabetical order. */
104 static uschar *item_table[] = {
133 #ifdef EXPERIMENTAL_SRS_NATIVE
168 #ifdef EXPERIMENTAL_SRS_NATIVE
174 /* Tables of operator names, and corresponding switch numbers. The names must be
175 in alphabetical order. There are two tables, because underscore is used in some
176 cases to introduce arguments, whereas for other it is part of the name. This is
177 an historical mis-design. */
179 static uschar *op_table_underscore[] = {
182 US"quote_local_part",
187 ,US"utf8_domain_from_alabel",
188 US"utf8_domain_to_alabel",
189 US"utf8_localpart_from_alabel",
190 US"utf8_localpart_to_alabel"
197 EOP_QUOTE_LOCAL_PART,
202 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
203 EOP_UTF8_DOMAIN_TO_ALABEL,
204 EOP_UTF8_LOCALPART_FROM_ALABEL,
205 EOP_UTF8_LOCALPART_TO_ALABEL
209 static uschar *op_table_main[] = {
258 EOP_ADDRESS = nelem(op_table_underscore),
306 /* Table of condition names, and corresponding switch numbers. The names must
307 be in alphabetical order. */
309 static uschar *cond_table[] = {
313 US"==", /* Backward compatibility */
336 #ifdef EXPERIMENTAL_SRS_NATIVE
353 US"match_local_part",
378 ECOND_FIRST_DELIVERY,
389 #ifdef EXPERIMENTAL_SRS_NATIVE
406 ECOND_MATCH_LOCAL_PART,
416 /* Types of table entry */
419 vtype_int, /* value is address of int */
420 vtype_filter_int, /* ditto, but recognized only when filtering */
421 vtype_ino, /* value is address of ino_t (not always an int) */
422 vtype_uid, /* value is address of uid_t (not always an int) */
423 vtype_gid, /* value is address of gid_t (not always an int) */
424 vtype_bool, /* value is address of bool */
425 vtype_stringptr, /* value is address of pointer to string */
426 vtype_msgbody, /* as stringptr, but read when first required */
427 vtype_msgbody_end, /* ditto, the end of the message */
428 vtype_msgheaders, /* the message's headers, processed */
429 vtype_msgheaders_raw, /* the message's headers, unprocessed */
430 vtype_localpart, /* extract local part from string */
431 vtype_domain, /* extract domain from string */
432 vtype_string_func, /* value is string returned by given function */
433 vtype_todbsdin, /* value not used; generate BSD inbox tod */
434 vtype_tode, /* value not used; generate tod in epoch format */
435 vtype_todel, /* value not used; generate tod in epoch/usec format */
436 vtype_todf, /* value not used; generate full tod */
437 vtype_todl, /* value not used; generate log tod */
438 vtype_todlf, /* value not used; generate log file datestamp tod */
439 vtype_todzone, /* value not used; generate time zone only */
440 vtype_todzulu, /* value not used; generate zulu tod */
441 vtype_reply, /* value not used; get reply from headers */
442 vtype_pid, /* value not used; result is pid */
443 vtype_host_lookup, /* value not used; get host name */
444 vtype_load_avg, /* value not used; result is int from os_getloadavg */
445 vtype_pspace, /* partition space; value is T/F for spool/log */
446 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
447 vtype_cert /* SSL certificate */
449 ,vtype_dkim /* Lookup of value in DKIM signature */
453 /* Type for main variable table */
461 /* Type for entries pointing to address/length pairs. Not currently
469 static uschar * fn_recipients(void);
470 typedef uschar * stringptr_fn_t(void);
471 static uschar * fn_queue_size(void);
473 /* This table must be kept in alphabetical order. */
475 static var_entry var_table[] = {
476 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
477 they will be confused with user-creatable ACL variables. */
478 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
479 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
480 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
481 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
482 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
483 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
484 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
485 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
486 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
487 { "acl_narg", vtype_int, &acl_narg },
488 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
489 { "address_data", vtype_stringptr, &deliver_address_data },
490 { "address_file", vtype_stringptr, &address_file },
491 { "address_pipe", vtype_stringptr, &address_pipe },
492 #ifdef EXPERIMENTAL_ARC
493 { "arc_domains", vtype_string_func, (void *) &fn_arc_domains },
494 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
495 { "arc_state", vtype_stringptr, &arc_state },
496 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
498 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
499 { "authenticated_id", vtype_stringptr, &authenticated_id },
500 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
501 { "authentication_failed",vtype_int, &authentication_failed },
502 #ifdef WITH_CONTENT_SCAN
503 { "av_failed", vtype_int, &av_failed },
505 #ifdef EXPERIMENTAL_BRIGHTMAIL
506 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
507 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
508 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
509 { "bmi_deliver", vtype_int, &bmi_deliver },
511 { "body_linecount", vtype_int, &body_linecount },
512 { "body_zerocount", vtype_int, &body_zerocount },
513 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
514 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
515 { "caller_gid", vtype_gid, &real_gid },
516 { "caller_uid", vtype_uid, &real_uid },
517 { "callout_address", vtype_stringptr, &callout_address },
518 { "compile_date", vtype_stringptr, &version_date },
519 { "compile_number", vtype_stringptr, &version_cnumber },
520 { "config_dir", vtype_stringptr, &config_main_directory },
521 { "config_file", vtype_stringptr, &config_main_filename },
522 { "csa_status", vtype_stringptr, &csa_status },
523 #ifdef EXPERIMENTAL_DCC
524 { "dcc_header", vtype_stringptr, &dcc_header },
525 { "dcc_result", vtype_stringptr, &dcc_result },
528 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
529 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
530 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
531 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
532 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
533 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
534 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
535 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
536 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
537 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
538 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
539 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
540 { "dkim_key_length", vtype_int, &dkim_key_length },
541 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
542 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
543 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
544 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
545 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
546 { "dkim_signers", vtype_stringptr, &dkim_signers },
547 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
548 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
551 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
552 { "dmarc_status", vtype_stringptr, &dmarc_status },
553 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
554 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
556 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
557 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
558 { "dnslist_text", vtype_stringptr, &dnslist_text },
559 { "dnslist_value", vtype_stringptr, &dnslist_value },
560 { "domain", vtype_stringptr, &deliver_domain },
561 { "domain_data", vtype_stringptr, &deliver_domain_data },
562 #ifndef DISABLE_EVENT
563 { "event_data", vtype_stringptr, &event_data },
565 /*XXX want to use generic vars for as many of these as possible*/
566 { "event_defer_errno", vtype_int, &event_defer_errno },
568 { "event_name", vtype_stringptr, &event_name },
570 { "exim_gid", vtype_gid, &exim_gid },
571 { "exim_path", vtype_stringptr, &exim_path },
572 { "exim_uid", vtype_uid, &exim_uid },
573 { "exim_version", vtype_stringptr, &version_string },
574 { "headers_added", vtype_string_func, (void *) &fn_hdrs_added },
575 { "home", vtype_stringptr, &deliver_home },
576 { "host", vtype_stringptr, &deliver_host },
577 { "host_address", vtype_stringptr, &deliver_host_address },
578 { "host_data", vtype_stringptr, &host_data },
579 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
580 { "host_lookup_failed", vtype_int, &host_lookup_failed },
581 { "host_port", vtype_int, &deliver_host_port },
582 { "initial_cwd", vtype_stringptr, &initial_cwd },
583 { "inode", vtype_ino, &deliver_inode },
584 { "interface_address", vtype_stringptr, &interface_address },
585 { "interface_port", vtype_int, &interface_port },
586 { "item", vtype_stringptr, &iterate_item },
588 { "ldap_dn", vtype_stringptr, &eldap_dn },
590 { "load_average", vtype_load_avg, NULL },
591 { "local_part", vtype_stringptr, &deliver_localpart },
592 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
593 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
594 { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v },
595 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
596 { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v },
597 { "local_part_verified", vtype_stringptr, &deliver_localpart_verified },
598 #ifdef HAVE_LOCAL_SCAN
599 { "local_scan_data", vtype_stringptr, &local_scan_data },
601 { "local_user_gid", vtype_gid, &local_user_gid },
602 { "local_user_uid", vtype_uid, &local_user_uid },
603 { "localhost_number", vtype_int, &host_number },
604 { "log_inodes", vtype_pinodes, (void *)FALSE },
605 { "log_space", vtype_pspace, (void *)FALSE },
606 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
607 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
608 #ifdef WITH_CONTENT_SCAN
609 { "malware_name", vtype_stringptr, &malware_name },
611 { "max_received_linelength", vtype_int, &max_received_linelength },
612 { "message_age", vtype_int, &message_age },
613 { "message_body", vtype_msgbody, &message_body },
614 { "message_body_end", vtype_msgbody_end, &message_body_end },
615 { "message_body_size", vtype_int, &message_body_size },
616 { "message_exim_id", vtype_stringptr, &message_id },
617 { "message_headers", vtype_msgheaders, NULL },
618 { "message_headers_raw", vtype_msgheaders_raw, NULL },
619 { "message_id", vtype_stringptr, &message_id },
620 { "message_linecount", vtype_int, &message_linecount },
621 { "message_size", vtype_int, &message_size },
623 { "message_smtputf8", vtype_bool, &message_smtputf8 },
625 #ifdef WITH_CONTENT_SCAN
626 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
627 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
628 { "mime_boundary", vtype_stringptr, &mime_boundary },
629 { "mime_charset", vtype_stringptr, &mime_charset },
630 { "mime_content_description", vtype_stringptr, &mime_content_description },
631 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
632 { "mime_content_id", vtype_stringptr, &mime_content_id },
633 { "mime_content_size", vtype_int, &mime_content_size },
634 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
635 { "mime_content_type", vtype_stringptr, &mime_content_type },
636 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
637 { "mime_filename", vtype_stringptr, &mime_filename },
638 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
639 { "mime_is_multipart", vtype_int, &mime_is_multipart },
640 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
641 { "mime_part_count", vtype_int, &mime_part_count },
643 { "n0", vtype_filter_int, &filter_n[0] },
644 { "n1", vtype_filter_int, &filter_n[1] },
645 { "n2", vtype_filter_int, &filter_n[2] },
646 { "n3", vtype_filter_int, &filter_n[3] },
647 { "n4", vtype_filter_int, &filter_n[4] },
648 { "n5", vtype_filter_int, &filter_n[5] },
649 { "n6", vtype_filter_int, &filter_n[6] },
650 { "n7", vtype_filter_int, &filter_n[7] },
651 { "n8", vtype_filter_int, &filter_n[8] },
652 { "n9", vtype_filter_int, &filter_n[9] },
653 { "original_domain", vtype_stringptr, &deliver_domain_orig },
654 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
655 { "originator_gid", vtype_gid, &originator_gid },
656 { "originator_uid", vtype_uid, &originator_uid },
657 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
658 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
659 { "pid", vtype_pid, NULL },
661 { "prdr_requested", vtype_bool, &prdr_requested },
663 { "primary_hostname", vtype_stringptr, &primary_hostname },
664 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
665 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
666 { "proxy_external_port", vtype_int, &proxy_external_port },
667 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
668 { "proxy_local_port", vtype_int, &proxy_local_port },
669 { "proxy_session", vtype_bool, &proxy_session },
671 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
672 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
673 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
674 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
675 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
676 { "queue_name", vtype_stringptr, &queue_name },
677 { "queue_size", vtype_string_func, &fn_queue_size },
678 { "rcpt_count", vtype_int, &rcpt_count },
679 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
680 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
681 { "received_count", vtype_int, &received_count },
682 { "received_for", vtype_stringptr, &received_for },
683 { "received_ip_address", vtype_stringptr, &interface_address },
684 { "received_port", vtype_int, &interface_port },
685 { "received_protocol", vtype_stringptr, &received_protocol },
686 { "received_time", vtype_int, &received_time.tv_sec },
687 { "recipient_data", vtype_stringptr, &recipient_data },
688 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
689 { "recipients", vtype_string_func, (void *) &fn_recipients },
690 { "recipients_count", vtype_int, &recipients_count },
691 #ifdef WITH_CONTENT_SCAN
692 { "regex_match_string", vtype_stringptr, ®ex_match_string },
694 { "reply_address", vtype_reply, NULL },
695 { "return_path", vtype_stringptr, &return_path },
696 { "return_size_limit", vtype_int, &bounce_return_size_limit },
697 { "router_name", vtype_stringptr, &router_name },
698 { "runrc", vtype_int, &runrc },
699 { "self_hostname", vtype_stringptr, &self_hostname },
700 { "sender_address", vtype_stringptr, &sender_address },
701 { "sender_address_data", vtype_stringptr, &sender_address_data },
702 { "sender_address_domain", vtype_domain, &sender_address },
703 { "sender_address_local_part", vtype_localpart, &sender_address },
704 { "sender_data", vtype_stringptr, &sender_data },
705 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
706 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
707 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
708 { "sender_host_address", vtype_stringptr, &sender_host_address },
709 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
710 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
711 { "sender_host_name", vtype_host_lookup, NULL },
712 { "sender_host_port", vtype_int, &sender_host_port },
713 { "sender_ident", vtype_stringptr, &sender_ident },
714 { "sender_rate", vtype_stringptr, &sender_rate },
715 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
716 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
717 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
718 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
719 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
720 { "sending_port", vtype_int, &sending_port },
721 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
722 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
723 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
724 { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist },
725 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
726 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
727 { "sn0", vtype_filter_int, &filter_sn[0] },
728 { "sn1", vtype_filter_int, &filter_sn[1] },
729 { "sn2", vtype_filter_int, &filter_sn[2] },
730 { "sn3", vtype_filter_int, &filter_sn[3] },
731 { "sn4", vtype_filter_int, &filter_sn[4] },
732 { "sn5", vtype_filter_int, &filter_sn[5] },
733 { "sn6", vtype_filter_int, &filter_sn[6] },
734 { "sn7", vtype_filter_int, &filter_sn[7] },
735 { "sn8", vtype_filter_int, &filter_sn[8] },
736 { "sn9", vtype_filter_int, &filter_sn[9] },
737 #ifdef WITH_CONTENT_SCAN
738 { "spam_action", vtype_stringptr, &spam_action },
739 { "spam_bar", vtype_stringptr, &spam_bar },
740 { "spam_report", vtype_stringptr, &spam_report },
741 { "spam_score", vtype_stringptr, &spam_score },
742 { "spam_score_int", vtype_stringptr, &spam_score_int },
745 { "spf_guess", vtype_stringptr, &spf_guess },
746 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
747 { "spf_received", vtype_stringptr, &spf_received },
748 { "spf_result", vtype_stringptr, &spf_result },
749 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
750 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
752 { "spool_directory", vtype_stringptr, &spool_directory },
753 { "spool_inodes", vtype_pinodes, (void *)TRUE },
754 { "spool_space", vtype_pspace, (void *)TRUE },
755 #ifdef EXPERIMENTAL_SRS
756 { "srs_db_address", vtype_stringptr, &srs_db_address },
757 { "srs_db_key", vtype_stringptr, &srs_db_key },
758 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
759 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
761 #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE)
762 { "srs_recipient", vtype_stringptr, &srs_recipient },
764 #ifdef EXPERIMENTAL_SRS
765 { "srs_status", vtype_stringptr, &srs_status },
767 { "thisaddress", vtype_stringptr, &filter_thisaddress },
769 /* The non-(in,out) variables are now deprecated */
770 { "tls_bits", vtype_int, &tls_in.bits },
771 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
772 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
774 { "tls_in_bits", vtype_int, &tls_in.bits },
775 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
776 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
777 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
778 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
779 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
780 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
781 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
782 #ifdef EXPERIMENTAL_TLS_RESUME
783 { "tls_in_resumption", vtype_int, &tls_in.resumption },
786 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
788 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
789 { "tls_out_bits", vtype_int, &tls_out.bits },
790 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
791 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
792 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
794 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
796 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
797 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
798 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
799 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
800 #ifdef EXPERIMENTAL_TLS_RESUME
801 { "tls_out_resumption", vtype_int, &tls_out.resumption },
804 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
807 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
809 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
811 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
813 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
816 { "tod_bsdinbox", vtype_todbsdin, NULL },
817 { "tod_epoch", vtype_tode, NULL },
818 { "tod_epoch_l", vtype_todel, NULL },
819 { "tod_full", vtype_todf, NULL },
820 { "tod_log", vtype_todl, NULL },
821 { "tod_logfile", vtype_todlf, NULL },
822 { "tod_zone", vtype_todzone, NULL },
823 { "tod_zulu", vtype_todzulu, NULL },
824 { "transport_name", vtype_stringptr, &transport_name },
825 { "value", vtype_stringptr, &lookup_value },
826 { "verify_mode", vtype_stringptr, &verify_mode },
827 { "version_number", vtype_stringptr, &version_string },
828 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
829 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
830 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
831 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
832 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
833 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
836 static int var_table_size = nelem(var_table);
837 static uschar var_buffer[256];
838 static BOOL malformed_header;
840 /* For textual hashes */
842 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
843 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
846 enum { HMAC_MD5, HMAC_SHA1 };
848 /* For numeric hashes */
850 static unsigned int prime[] = {
851 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
852 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
853 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
855 /* For printing modes in symbolic form */
857 static uschar *mtable_normal[] =
858 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
860 static uschar *mtable_setid[] =
861 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
863 static uschar *mtable_sticky[] =
864 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
866 /* flags for find_header() */
867 #define FH_EXISTS_ONLY BIT(0)
868 #define FH_WANT_RAW BIT(1)
869 #define FH_WANT_LIST BIT(2)
872 /*************************************************
873 * Tables for UTF-8 support *
874 *************************************************/
876 /* Table of the number of extra characters, indexed by the first character
877 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
880 static uschar utf8_table1[] = {
881 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
882 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
883 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
884 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
886 /* These are the masks for the data bits in the first byte of a character,
887 indexed by the number of additional bytes. */
889 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
891 /* Get the next UTF-8 character, advancing the pointer. */
893 #define GETUTF8INC(c, ptr) \
895 if ((c & 0xc0) == 0xc0) \
897 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
899 c = (c & utf8_table2[a]) << s; \
903 c |= (*ptr++ & 0x3f) << s; \
909 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
911 /*************************************************
912 * Binary chop search on a table *
913 *************************************************/
915 /* This is used for matching expansion items and operators.
918 name the name that is being sought
919 table the table to search
920 table_size the number of items in the table
922 Returns: the offset in the table, or -1
926 chop_match(uschar *name, uschar **table, int table_size)
928 uschar **bot = table;
929 uschar **top = table + table_size;
933 uschar **mid = bot + (top - bot)/2;
934 int c = Ustrcmp(name, *mid);
935 if (c == 0) return mid - table;
936 if (c > 0) bot = mid + 1; else top = mid;
944 /*************************************************
945 * Check a condition string *
946 *************************************************/
948 /* This function is called to expand a string, and test the result for a "true"
949 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
950 forced fail or lookup defer.
952 We used to release all store used, but this is not not safe due
953 to ${dlfunc } and ${acl }. In any case expand_string_internal()
954 is reasonably careful to release what it can.
956 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
959 condition the condition string
960 m1 text to be incorporated in panic error
963 Returns: TRUE if condition is met, FALSE if not
967 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
969 uschar * ss = expand_string(condition);
972 if (!f.expand_string_forcedfail && !f.search_find_defer)
973 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
974 "for %s %s: %s", condition, m1, m2, expand_string_message);
977 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
978 strcmpic(ss, US"false") != 0;
984 /*************************************************
985 * Pseudo-random number generation *
986 *************************************************/
988 /* Pseudo-random number generation. The result is not "expected" to be
989 cryptographically strong but not so weak that someone will shoot themselves
990 in the foot using it as a nonce in some email header scheme or whatever
991 weirdness they'll twist this into. The result should ideally handle fork().
993 However, if we're stuck unable to provide this, then we'll fall back to
994 appallingly bad randomness.
996 If DISABLE_TLS is not defined then this will not be used except as an emergency
1001 Returns a random number in range [0, max-1]
1005 # define vaguely_random_number vaguely_random_number_fallback
1008 vaguely_random_number(int max)
1011 # undef vaguely_random_number
1013 static pid_t pid = 0;
1016 if ((p2 = getpid()) != pid)
1021 #ifdef HAVE_ARC4RANDOM
1022 /* cryptographically strong randomness, common on *BSD platforms, not
1023 so much elsewhere. Alas. */
1024 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1027 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1028 # ifdef HAVE_SRANDOMDEV
1029 /* uses random(4) for seeding */
1034 gettimeofday(&tv, NULL);
1035 srandom(tv.tv_sec | tv.tv_usec | getpid());
1039 /* Poor randomness and no seeding here */
1046 #ifdef HAVE_ARC4RANDOM
1047 return arc4random() % max;
1048 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1049 return random() % max;
1051 /* This one returns a 16-bit number, definitely not crypto-strong */
1052 return random_number(max);
1059 /*************************************************
1060 * Pick out a name from a string *
1061 *************************************************/
1063 /* If the name is too long, it is silently truncated.
1066 name points to a buffer into which to put the name
1067 max is the length of the buffer
1068 s points to the first alphabetic character of the name
1069 extras chars other than alphanumerics to permit
1071 Returns: pointer to the first character after the name
1073 Note: The test for *s != 0 in the while loop is necessary because
1074 Ustrchr() yields non-NULL if the character is zero (which is not something
1077 static const uschar *
1078 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1081 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1083 if (ptr < max-1) name[ptr++] = *s;
1092 /*************************************************
1093 * Pick out the rest of a header name *
1094 *************************************************/
1096 /* A variable name starting $header_ (or just $h_ for those who like
1097 abbreviations) might not be the complete header name because headers can
1098 contain any printing characters in their names, except ':'. This function is
1099 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1100 on the end, if the name was terminated by white space.
1103 name points to a buffer in which the name read so far exists
1104 max is the length of the buffer
1105 s points to the first character after the name so far, i.e. the
1106 first non-alphameric character after $header_xxxxx
1108 Returns: a pointer to the first character after the header name
1111 static const uschar *
1112 read_header_name(uschar *name, int max, const uschar *s)
1114 int prelen = Ustrchr(name, '_') - name + 1;
1115 int ptr = Ustrlen(name) - prelen;
1116 if (ptr > 0) memmove(name, name+prelen, ptr);
1117 while (mac_isgraph(*s) && *s != ':')
1119 if (ptr < max-1) name[ptr++] = *s;
1130 /*************************************************
1131 * Pick out a number from a string *
1132 *************************************************/
1135 n points to an integer into which to put the number
1136 s points to the first digit of the number
1138 Returns: a pointer to the character after the last digit
1140 /*XXX consider expanding to int_eximarith_t. But the test for
1141 "overbig numbers" in 0002 still needs to overflow it. */
1144 read_number(int *n, uschar *s)
1147 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1151 static const uschar *
1152 read_cnumber(int *n, const uschar *s)
1155 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1161 /*************************************************
1162 * Extract keyed subfield from a string *
1163 *************************************************/
1165 /* The yield is in dynamic store; NULL means that the key was not found.
1168 key points to the name of the key
1169 s points to the string from which to extract the subfield
1171 Returns: NULL if the subfield was not found, or
1172 a pointer to the subfield's data
1176 expand_getkeyed(uschar * key, const uschar * s)
1178 int length = Ustrlen(key);
1179 Uskip_whitespace(&s);
1181 /* Loop to search for the key */
1187 const uschar * dkey = s;
1189 while (*s && *s != '=' && !isspace(*s)) s++;
1190 dkeylength = s - dkey;
1191 if (Uskip_whitespace(&s) == '=') while (isspace(*++s));
1193 data = string_dequote(&s);
1194 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1197 Uskip_whitespace(&s);
1206 find_var_ent(uschar * name)
1209 int last = var_table_size;
1211 while (last > first)
1213 int middle = (first + last)/2;
1214 int c = Ustrcmp(name, var_table[middle].name);
1216 if (c > 0) { first = middle + 1; continue; }
1217 if (c < 0) { last = middle; continue; }
1218 return &var_table[middle];
1223 /*************************************************
1224 * Extract numbered subfield from string *
1225 *************************************************/
1227 /* Extracts a numbered field from a string that is divided by tokens - for
1228 example a line from /etc/passwd is divided by colon characters. First field is
1229 numbered one. Negative arguments count from the right. Zero returns the whole
1230 string. Returns NULL if there are insufficient tokens in the string
1233 Modifies final argument - this is a dynamically generated string, so that's OK.
1236 field number of field to be extracted,
1237 first field = 1, whole string = 0, last field = -1
1238 separators characters that are used to break string into tokens
1239 s points to the string from which to extract the subfield
1241 Returns: NULL if the field was not found,
1242 a pointer to the field's data inside s (modified to add 0)
1246 expand_gettokened (int field, uschar *separators, uschar *s)
1251 uschar *fieldtext = NULL;
1253 if (field == 0) return s;
1255 /* Break the line up into fields in place; for field > 0 we stop when we have
1256 done the number of fields we want. For field < 0 we continue till the end of
1257 the string, counting the number of fields. */
1259 count = (field > 0)? field : INT_MAX;
1265 /* Previous field was the last one in the string. For a positive field
1266 number, this means there are not enough fields. For a negative field number,
1267 check that there are enough, and scan back to find the one that is wanted. */
1271 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1272 if ((-field) == (INT_MAX - count - 1)) return s;
1276 while (ss[-1] != 0) ss--;
1282 /* Previous field was not last in the string; save its start and put a
1286 len = Ustrcspn(ss, separators);
1297 expand_getlistele(int field, const uschar * list)
1299 const uschar * tlist = list;
1305 for (field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1308 if (field == 0) return NULL;
1309 while (--field > 0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1310 return string_nextinlist(&list, &sep, NULL, 0);
1314 /* Certificate fields, by name. Worry about by-OID later */
1315 /* Names are chosen to not have common prefixes */
1322 uschar * (*getfn)(void * cert, uschar * mod);
1324 static certfield certfields[] =
1325 { /* linear search; no special order */
1326 { US"version", 7, &tls_cert_version },
1327 { US"serial_number", 13, &tls_cert_serial_number },
1328 { US"subject", 7, &tls_cert_subject },
1329 { US"notbefore", 9, &tls_cert_not_before },
1330 { US"notafter", 8, &tls_cert_not_after },
1331 { US"issuer", 6, &tls_cert_issuer },
1332 { US"signature", 9, &tls_cert_signature },
1333 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1334 { US"subj_altname", 12, &tls_cert_subject_altname },
1335 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1336 { US"crl_uri", 7, &tls_cert_crl_uri },
1340 expand_getcertele(uschar * field, uschar * certvar)
1344 if (!(vp = find_var_ent(certvar)))
1346 expand_string_message =
1347 string_sprintf("no variable named \"%s\"", certvar);
1348 return NULL; /* Unknown variable name */
1350 /* NB this stops us passing certs around in variable. Might
1351 want to do that in future */
1352 if (vp->type != vtype_cert)
1354 expand_string_message =
1355 string_sprintf("\"%s\" is not a certificate", certvar);
1356 return NULL; /* Unknown variable name */
1358 if (!*(void **)vp->value)
1361 if (*field >= '0' && *field <= '9')
1362 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1364 for (certfield * cp = certfields;
1365 cp < certfields + nelem(certfields);
1367 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1369 uschar * modifier = *(field += cp->namelen) == ','
1371 return (*cp->getfn)( *(void **)vp->value, modifier );
1374 expand_string_message =
1375 string_sprintf("bad field selector \"%s\" for certextract", field);
1378 #endif /*DISABLE_TLS*/
1380 /*************************************************
1381 * Extract a substring from a string *
1382 *************************************************/
1384 /* Perform the ${substr or ${length expansion operations.
1387 subject the input string
1388 value1 the offset from the start of the input string to the start of
1389 the output string; if negative, count from the right.
1390 value2 the length of the output string, or negative (-1) for unset
1391 if value1 is positive, unset means "all after"
1392 if value1 is negative, unset means "all before"
1393 len set to the length of the returned string
1395 Returns: pointer to the output string, or NULL if there is an error
1399 extract_substr(uschar *subject, int value1, int value2, int *len)
1401 int sublen = Ustrlen(subject);
1403 if (value1 < 0) /* count from right */
1407 /* If the position is before the start, skip to the start, and adjust the
1408 length. If the length ends up negative, the substring is null because nothing
1409 can precede. This falls out naturally when the length is unset, meaning "all
1415 if (value2 < 0) value2 = 0;
1419 /* Otherwise an unset length => characters before value1 */
1421 else if (value2 < 0)
1428 /* For a non-negative offset, if the starting position is past the end of the
1429 string, the result will be the null string. Otherwise, an unset length means
1430 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1434 if (value1 > sublen)
1439 else if (value2 < 0) value2 = sublen;
1442 /* Cut the length down to the maximum possible for the offset value, and get
1443 the required characters. */
1445 if (value1 + value2 > sublen) value2 = sublen - value1;
1447 return subject + value1;
1453 /*************************************************
1454 * Old-style hash of a string *
1455 *************************************************/
1457 /* Perform the ${hash expansion operation.
1460 subject the input string (an expanded substring)
1461 value1 the length of the output string; if greater or equal to the
1462 length of the input string, the input string is returned
1463 value2 the number of hash characters to use, or 26 if negative
1464 len set to the length of the returned string
1466 Returns: pointer to the output string, or NULL if there is an error
1470 compute_hash(uschar *subject, int value1, int value2, int *len)
1472 int sublen = Ustrlen(subject);
1474 if (value2 < 0) value2 = 26;
1475 else if (value2 > Ustrlen(hashcodes))
1477 expand_string_message =
1478 string_sprintf("hash count \"%d\" too big", value2);
1482 /* Calculate the hash text. We know it is shorter than the original string, so
1483 can safely place it in subject[] (we know that subject is always itself an
1484 expanded substring). */
1486 if (value1 < sublen)
1491 while ((c = (subject[j])) != 0)
1493 int shift = (c + j++) & 7;
1494 subject[i] ^= (c << shift) | (c >> (8-shift));
1495 if (++i >= value1) i = 0;
1497 for (i = 0; i < value1; i++)
1498 subject[i] = hashcodes[(subject[i]) % value2];
1500 else value1 = sublen;
1509 /*************************************************
1510 * Numeric hash of a string *
1511 *************************************************/
1513 /* Perform the ${nhash expansion operation. The first characters of the
1514 string are treated as most important, and get the highest prime numbers.
1517 subject the input string
1518 value1 the maximum value of the first part of the result
1519 value2 the maximum value of the second part of the result,
1520 or negative to produce only a one-part result
1521 len set to the length of the returned string
1523 Returns: pointer to the output string, or NULL if there is an error.
1527 compute_nhash (uschar *subject, int value1, int value2, int *len)
1529 uschar *s = subject;
1531 unsigned long int total = 0; /* no overflow */
1535 if (i == 0) i = nelem(prime) - 1;
1536 total += prime[i--] * (unsigned int)(*s++);
1539 /* If value2 is unset, just compute one number */
1542 s = string_sprintf("%lu", total % value1);
1544 /* Otherwise do a div/mod hash */
1548 total = total % (value1 * value2);
1549 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1560 /*************************************************
1561 * Find the value of a header or headers *
1562 *************************************************/
1564 /* Multiple instances of the same header get concatenated, and this function
1565 can also return a concatenation of all the header lines. When concatenating
1566 specific headers that contain lists of addresses, a comma is inserted between
1567 them. Otherwise we use a straight concatenation. Because some messages can have
1568 pathologically large number of lines, there is a limit on the length that is
1572 name the name of the header, without the leading $header_ or $h_,
1573 or NULL if a concatenation of all headers is required
1574 newsize return the size of memory block that was obtained; may be NULL
1575 if exists_only is TRUE
1576 flags FH_EXISTS_ONLY
1577 set if called from a def: test; don't need to build a string;
1578 just return a string that is not "" and not "0" if the header
1581 set if called for $rh_ or $rheader_ items; no processing,
1582 other than concatenating, will be done on the header. Also used
1583 for $message_headers_raw.
1585 Double colon chars in the content, and replace newline with
1586 colon between each element when concatenating; returning a
1587 colon-sep list (elements might contain newlines)
1588 charset name of charset to translate MIME words to; used only if
1589 want_raw is false; if NULL, no translation is done (this is
1590 used for $bh_ and $bheader_)
1592 Returns: NULL if the header does not exist, else a pointer to a new
1597 find_header(uschar *name, int *newsize, unsigned flags, uschar *charset)
1600 int len = name ? Ustrlen(name) : 0;
1604 for (header_line * h = header_list; h; h = h->next)
1605 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1606 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1611 if (flags & FH_EXISTS_ONLY)
1612 return US"1"; /* don't need actual string */
1615 s = h->text + len; /* text to insert */
1616 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1617 Uskip_whitespace(&s); /* remove leading white space */
1618 t = h->text + h->slen; /* end-point */
1620 /* Unless wanted raw, remove trailing whitespace, including the
1623 if (flags & FH_WANT_LIST)
1624 while (t > s && t[-1] == '\n') t--;
1625 else if (!(flags & FH_WANT_RAW))
1627 while (t > s && isspace(t[-1])) t--;
1629 /* Set comma if handling a single header and it's one of those
1630 that contains an address list, except when asked for raw headers. Only
1631 need to do this once. */
1633 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1636 /* Trim the header roughly if we're approaching limits */
1638 if (gstring_length(g) + inc > header_insert_maxlen)
1639 inc = header_insert_maxlen - gstring_length(g);
1641 /* For raw just copy the data; for a list, add the data as a colon-sep
1642 list-element; for comma-list add as an unchecked comma,newline sep
1643 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1644 stripped trailing WS above including the newline). We ignore the potential
1645 expansion due to colon-doubling, just leaving the loop if the limit is met
1648 if (flags & FH_WANT_LIST)
1649 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1650 else if (flags & FH_WANT_RAW)
1651 g = string_catn(g, s, (unsigned)inc);
1653 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1656 if (gstring_length(g) >= header_insert_maxlen) break;
1659 if (!found) return NULL; /* No header found */
1660 if (!g) return US"";
1662 /* That's all we do for raw header expansion. */
1665 if (flags & FH_WANT_RAW)
1666 return string_from_gstring(g);
1668 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1669 The rfc2047_decode2() function can return an error with decoded data if the
1670 charset translation fails. If decoding fails, it returns NULL. */
1674 uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g),
1675 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1677 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1678 " input was: %s\n", error, g->s);
1679 return decoded ? decoded : string_from_gstring(g);
1686 /* Append a "local" element to an Authentication-Results: header
1687 if this was a non-smtp message.
1691 authres_local(gstring * g, const uschar * sysname)
1693 if (!f.authentication_local)
1695 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1696 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1701 /* Append an "iprev" element to an Authentication-Results: header
1702 if we have attempted to get the calling host's name.
1706 authres_iprev(gstring * g)
1708 if (sender_host_name)
1709 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1710 else if (host_lookup_deferred)
1711 g = string_catn(g, US";\n\tiprev=temperror", 19);
1712 else if (host_lookup_failed)
1713 g = string_catn(g, US";\n\tiprev=fail", 13);
1717 if (sender_host_address)
1718 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1724 /*************************************************
1725 * Return list of recipients *
1726 *************************************************/
1727 /* A recipients list is available only during system message filtering,
1728 during ACL processing after DATA, and while expanding pipe commands
1729 generated from a system filter, but not elsewhere. */
1737 if (!f.enable_dollar_recipients) return NULL;
1739 for (int i = 0; i < recipients_count; i++)
1741 s = recipients_list[i].address;
1742 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1744 return g ? g->s : NULL;
1748 /*************************************************
1749 * Return size of queue *
1750 *************************************************/
1751 /* Ask the daemon for the queue size */
1756 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1760 const uschar * where;
1761 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1767 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1769 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1773 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1774 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1775 len = offsetof(struct sockaddr_un, sun_path) + 1
1776 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid());
1778 sname = string_sprintf("%s/p_%d", spool_directory, getpid());
1779 len = offsetof(struct sockaddr_un, sun_path)
1780 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname);
1783 if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0)
1784 { where = US"bind"; goto bad; }
1787 debug_printf("local addr '%s%s'\n",
1788 *sa_un.sun_path ? "" : "@",
1789 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1792 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1793 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1794 len = offsetof(struct sockaddr_un, sun_path) + 1
1795 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s",
1796 expand_string(notifier_socket));
1798 len = offsetof(struct sockaddr_un, sun_path)
1799 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s",
1800 expand_string(notifier_socket));
1803 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1804 { where = US"connect"; goto bad2; }
1806 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1807 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1809 FD_ZERO(&fds); FD_SET(fd, &fds);
1810 tv.tv_sec = 2; tv.tv_usec = 0;
1811 if (select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv) != 1)
1813 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1814 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1816 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1817 { where = US"recv"; goto bad2; }
1820 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1823 return string_copyn(buf, len);
1826 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1831 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1836 /*************************************************
1837 * Find value of a variable *
1838 *************************************************/
1840 /* The table of variables is kept in alphabetic order, so we can search it
1841 using a binary chop. The "choplen" variable is nothing to do with the binary
1845 name the name of the variable being sought
1846 exists_only TRUE if this is a def: test; passed on to find_header()
1847 skipping TRUE => skip any processing evaluation; this is not the same as
1848 exists_only because def: may test for values that are first
1850 newsize pointer to an int which is initially zero; if the answer is in
1851 a new memory buffer, *newsize is set to its size
1853 Returns: NULL if the variable does not exist, or
1854 a pointer to the variable's contents, or
1855 something non-NULL if exists_only is TRUE
1859 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1866 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1867 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1868 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1869 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1870 (this gave backwards compatibility at the changeover). There may be built-in
1871 variables whose names start acl_ but they should never start in this way. This
1872 slightly messy specification is a consequence of the history, needless to say.
1874 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1875 set, in which case give an error. */
1877 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1881 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1882 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1884 else if (Ustrncmp(name, "r_", 2) == 0)
1886 tree_node * node = tree_search(router_var, name + 2);
1887 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1890 /* Handle $auth<n> variables. */
1892 if (Ustrncmp(name, "auth", 4) == 0)
1895 int n = Ustrtoul(name + 4, &endptr, 10);
1896 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1897 return !auth_vars[n-1] ? US"" : auth_vars[n-1];
1899 else if (Ustrncmp(name, "regex", 5) == 0)
1902 int n = Ustrtoul(name + 5, &endptr, 10);
1903 if (*endptr == 0 && n != 0 && n <= REGEX_VARS)
1904 return !regex_vars[n-1] ? US"" : regex_vars[n-1];
1907 /* For all other variables, search the table */
1909 if (!(vp = find_var_ent(name)))
1910 return NULL; /* Unknown variable name */
1912 /* Found an existing variable. If in skipping state, the value isn't needed,
1913 and we want to avoid processing (such as looking up the host name). */
1921 case vtype_filter_int:
1922 if (!f.filter_running) return NULL;
1926 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1930 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1934 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1938 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1942 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1945 case vtype_stringptr: /* Pointer to string */
1946 return (s = *((uschar **)(val))) ? s : US"";
1949 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1952 case vtype_load_avg:
1953 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1956 case vtype_host_lookup: /* Lookup if not done so */
1957 if ( !sender_host_name && sender_host_address
1958 && !host_lookup_failed && host_name_lookup() == OK)
1959 host_build_sender_fullhost();
1960 return sender_host_name ? sender_host_name : US"";
1962 case vtype_localpart: /* Get local part from address */
1963 if (!(s = *((uschar **)(val)))) return US"";
1964 if (!(domain = Ustrrchr(s, '@'))) return s;
1965 if (domain - s > sizeof(var_buffer) - 1)
1966 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1967 " in string expansion", sizeof(var_buffer));
1968 return string_copyn(s, domain - s);
1970 case vtype_domain: /* Get domain from address */
1971 if (!(s = *((uschar **)(val)))) return US"";
1972 domain = Ustrrchr(s, '@');
1973 return domain ? domain + 1 : US"";
1975 case vtype_msgheaders:
1976 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1978 case vtype_msgheaders_raw:
1979 return find_header(NULL, newsize,
1980 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1982 case vtype_msgbody: /* Pointer to msgbody string */
1983 case vtype_msgbody_end: /* Ditto, the end of the msg */
1984 ss = (uschar **)(val);
1985 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1988 off_t start_offset = SPOOL_DATA_START_OFFSET;
1989 int len = message_body_visible;
1990 if (len > message_size) len = message_size;
1991 *ss = body = store_malloc(len+1);
1993 if (vp->type == vtype_msgbody_end)
1995 struct stat statbuf;
1996 if (fstat(deliver_datafile, &statbuf) == 0)
1998 start_offset = statbuf.st_size - len;
1999 if (start_offset < SPOOL_DATA_START_OFFSET)
2000 start_offset = SPOOL_DATA_START_OFFSET;
2003 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
2004 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
2006 len = read(deliver_datafile, body, len);
2010 if (message_body_newlines) /* Separate loops for efficiency */
2012 { if (body[--len] == 0) body[len] = ' '; }
2015 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
2018 return *ss ? *ss : US"";
2020 case vtype_todbsdin: /* BSD inbox time of day */
2021 return tod_stamp(tod_bsdin);
2023 case vtype_tode: /* Unix epoch time of day */
2024 return tod_stamp(tod_epoch);
2026 case vtype_todel: /* Unix epoch/usec time of day */
2027 return tod_stamp(tod_epoch_l);
2029 case vtype_todf: /* Full time of day */
2030 return tod_stamp(tod_full);
2032 case vtype_todl: /* Log format time of day */
2033 return tod_stamp(tod_log_bare); /* (without timezone) */
2035 case vtype_todzone: /* Time zone offset only */
2036 return tod_stamp(tod_zone);
2038 case vtype_todzulu: /* Zulu time */
2039 return tod_stamp(tod_zulu);
2041 case vtype_todlf: /* Log file datestamp tod */
2042 return tod_stamp(tod_log_datestamp_daily);
2044 case vtype_reply: /* Get reply address */
2045 s = find_header(US"reply-to:", newsize,
2046 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2048 if (s) Uskip_whitespace(&s);
2051 *newsize = 0; /* For the *s==0 case */
2052 s = find_header(US"from:", newsize,
2053 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2059 Uskip_whitespace(&s);
2060 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2061 while (t > s && isspace(t[-1])) t--;
2064 return s ? s : US"";
2066 case vtype_string_func:
2068 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2075 sprintf(CS var_buffer, PR_EXIM_ARITH,
2076 receive_statvfs(val == (void *)TRUE, &inodes));
2083 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2084 sprintf(CS var_buffer, "%d", inodes);
2089 return *(void **)val ? US"<cert>" : US"";
2091 #ifndef DISABLE_DKIM
2093 return dkim_exim_expand_query((int)(long)val);
2098 return NULL; /* Unknown variable. Silences static checkers. */
2105 modify_variable(uschar *name, void * value)
2108 if ((vp = find_var_ent(name))) vp->value = value;
2109 return; /* Unknown variable name, fail silently */
2117 /*************************************************
2118 * Read and expand substrings *
2119 *************************************************/
2121 /* This function is called to read and expand argument substrings for various
2122 expansion items. Some have a minimum requirement that is less than the maximum;
2123 in these cases, the first non-present one is set to NULL.
2126 sub points to vector of pointers to set
2127 n maximum number of substrings
2129 sptr points to current string pointer
2130 skipping the skipping flag
2131 check_end if TRUE, check for final '}'
2132 name name of item, for error message
2133 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2136 Returns: 0 OK; string pointer updated
2137 1 curly bracketing error (too few arguments)
2138 2 too many arguments (only if check_end is set); message set
2139 3 other error (expansion failure)
2143 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2144 BOOL check_end, uschar *name, BOOL *resetok)
2146 const uschar *s = *sptr;
2148 Uskip_whitespace(&s);
2149 for (int i = 0; i < n; i++)
2155 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2156 "(min is %d)", name, m);
2162 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2164 if (*s++ != '}') return 1;
2165 Uskip_whitespace(&s);
2167 if (check_end && *s++ != '}')
2171 expand_string_message = string_sprintf("Too many arguments for '%s' "
2172 "(max is %d)", name, n);
2175 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2186 /*************************************************
2187 * Elaborate message for bad variable *
2188 *************************************************/
2190 /* For the "unknown variable" message, take a look at the variable's name, and
2191 give additional information about possible ACL variables. The extra information
2192 is added on to expand_string_message.
2194 Argument: the name of the variable
2199 check_variable_error_message(uschar *name)
2201 if (Ustrncmp(name, "acl_", 4) == 0)
2202 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2203 (name[4] == 'c' || name[4] == 'm')?
2205 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2206 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2208 US"user-defined ACL variables must start acl_c or acl_m");
2214 Load args from sub array to globals, and call acl_check().
2215 Sub array will be corrupted on return.
2217 Returns: OK access is granted by an ACCEPT verb
2218 DISCARD access is (apparently) granted by a DISCARD verb
2219 FAIL access is denied
2220 FAIL_DROP access is denied; drop the connection
2221 DEFER can't tell at the moment
2225 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2228 int sav_narg = acl_narg;
2230 uschar * dummy_logmsg;
2231 extern int acl_where;
2233 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2234 for (i = 0; i < nsub && sub[i+1]; i++)
2236 uschar * tmp = acl_arg[i];
2237 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2238 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2243 sub[i+1] = acl_arg[i];
2244 acl_arg[i++] = NULL;
2248 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2250 acl_narg>0 ? acl_arg[0] : US"<none>",
2251 acl_narg>1 ? " +more" : "");
2253 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2255 for (i = 0; i < nsub; i++)
2256 acl_arg[i] = sub[i+1]; /* restore old args */
2257 acl_narg = sav_narg;
2265 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2266 The given string is modified on return. Leading whitespace is skipped while
2267 looking for the opening wrap character, then the rest is scanned for the trailing
2268 (non-escaped) wrap character. A backslash in the string will act as an escape.
2270 A nul is written over the trailing wrap, and a pointer to the char after the
2271 leading wrap is returned.
2274 s String for de-wrapping
2275 wrap Two-char string, the first being the opener, second the closer wrapping
2278 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2282 dewrap(uschar * s, const uschar * wrap)
2286 BOOL quotesmode = wrap[0] == wrap[1];
2288 if (Uskip_whitespace(&p) == *wrap)
2294 if (*p == '\\') p++;
2295 else if (!quotesmode && *p == wrap[-1]) depth++;
2296 else if (*p == *wrap)
2307 expand_string_message = string_sprintf("missing '%c'", *wrap);
2312 /* Pull off the leading array or object element, returning
2313 a copy in an allocated string. Update the list pointer.
2315 The element may itself be an abject or array.
2316 Return NULL when the list is empty.
2320 json_nextinlist(const uschar ** list)
2322 unsigned array_depth = 0, object_depth = 0;
2323 const uschar * s = *list, * item;
2325 skip_whitespace(&s);
2328 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2332 case '[': array_depth++; break;
2333 case ']': array_depth--; break;
2334 case '{': object_depth++; break;
2335 case '}': object_depth--; break;
2337 *list = *s ? s+1 : s;
2338 if (item == s) return NULL;
2339 item = string_copyn(item, s - item);
2340 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2346 /************************************************/
2347 /* Return offset in ops table, or -1 if not found.
2348 Repoint to just after the operator in the string.
2351 ss string representation of operator
2352 opname split-out operator name
2356 identify_operator(const uschar ** ss, uschar ** opname)
2358 const uschar * s = *ss;
2361 /* Numeric comparisons are symbolic */
2363 if (*s == '=' || *s == '>' || *s == '<')
2375 /* All other conditions are named */
2378 s = read_name(name, sizeof(name), s, US"_");
2381 /* If we haven't read a name, it means some non-alpha character is first. */
2385 expand_string_message = string_sprintf("condition name expected, "
2386 "but found \"%.16s\"", s);
2390 *opname = string_copy(name);
2392 return chop_match(name, cond_table, nelem(cond_table));
2396 /*************************************************
2397 * Handle MD5 or SHA-1 computation for HMAC *
2398 *************************************************/
2400 /* These are some wrapping functions that enable the HMAC code to be a bit
2401 cleaner. A good compiler will spot the tail recursion.
2404 type HMAC_MD5 or HMAC_SHA1
2405 remaining are as for the cryptographic hash functions
2411 chash_start(int type, void * base)
2413 if (type == HMAC_MD5)
2414 md5_start((md5 *)base);
2416 sha1_start((hctx *)base);
2420 chash_mid(int type, void * base, const uschar * string)
2422 if (type == HMAC_MD5)
2423 md5_mid((md5 *)base, string);
2425 sha1_mid((hctx *)base, string);
2429 chash_end(int type, void * base, const uschar * string, int length,
2432 if (type == HMAC_MD5)
2433 md5_end((md5 *)base, string, length, digest);
2435 sha1_end((hctx *)base, string, length, digest);
2441 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2442 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2445 key encoding key, nul-terminated
2446 src data to be hashed, nul-terminated
2448 len size of output buffer
2452 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2455 const uschar * keyptr;
2457 unsigned int keylen;
2459 #define MD5_HASHLEN 16
2460 #define MD5_HASHBLOCKLEN 64
2462 uschar keyhash[MD5_HASHLEN];
2463 uschar innerhash[MD5_HASHLEN];
2464 uschar finalhash[MD5_HASHLEN];
2465 uschar innerkey[MD5_HASHBLOCKLEN];
2466 uschar outerkey[MD5_HASHBLOCKLEN];
2469 keylen = Ustrlen(keyptr);
2471 /* If the key is longer than the hash block length, then hash the key
2474 if (keylen > MD5_HASHBLOCKLEN)
2476 chash_start(HMAC_MD5, &md5_base);
2477 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2479 keylen = MD5_HASHLEN;
2482 /* Now make the inner and outer key values */
2484 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2485 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2487 for (int i = 0; i < keylen; i++)
2489 innerkey[i] ^= keyptr[i];
2490 outerkey[i] ^= keyptr[i];
2493 /* Now do the hashes */
2495 chash_start(HMAC_MD5, &md5_base);
2496 chash_mid(HMAC_MD5, &md5_base, innerkey);
2497 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2499 chash_start(HMAC_MD5, &md5_base);
2500 chash_mid(HMAC_MD5, &md5_base, outerkey);
2501 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2503 /* Encode the final hash as a hex string, limited by output buffer size */
2506 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2508 if (j-- <= 0) break;
2509 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2510 if (j-- <= 0) break;
2511 *p++ = hex_digits[finalhash[i] & 0x0f];
2517 /*************************************************
2518 * Read and evaluate a condition *
2519 *************************************************/
2523 s points to the start of the condition text
2524 resetok points to a BOOL which is written false if it is unsafe to
2525 free memory. Certain condition types (acl) may have side-effect
2526 allocation which must be preserved.
2527 yield points to a BOOL to hold the result of the condition test;
2528 if NULL, we are just reading through a condition that is
2529 part of an "or" combination to check syntax, or in a state
2530 where the answer isn't required
2532 Returns: a pointer to the first character after the condition, or
2536 static const uschar *
2537 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2539 BOOL testfor = TRUE;
2540 BOOL tempcond, combined_cond;
2542 BOOL sub2_honour_dollar = TRUE;
2543 BOOL is_forany, is_json, is_jsons;
2544 int rc, cond_type, roffset;
2545 int_eximarith_t num[2];
2546 struct stat statbuf;
2549 const uschar *sub[10];
2552 const uschar *rerror;
2555 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2557 switch(cond_type = identify_operator(&s, &opname))
2559 /* def: tests for a non-empty variable, or for the existence of a header. If
2560 yield == NULL we are in a skipping state, and don't care about the answer. */
2568 expand_string_message = US"\":\" expected after \"def\"";
2572 s = read_name(name, sizeof(name), s+1, US"_");
2574 /* Test for a header's existence. If the name contains a closing brace
2575 character, this may be a user error where the terminating colon has been
2576 omitted. Set a flag to adjust a subsequent error message in this case. */
2578 if ( ( *(t = name) == 'h'
2579 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2581 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2584 s = read_header_name(name, sizeof(name), s);
2585 /* {-for-text-editors */
2586 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2588 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2591 /* Test for a variable's having a non-empty value. A non-existent variable
2592 causes an expansion failure. */
2596 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2598 expand_string_message = name[0]
2599 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2600 : US"variable name omitted after \"def:\"";
2601 check_variable_error_message(name);
2604 if (yield) *yield = (t[0] != 0) == testfor;
2611 /* first_delivery tests for first delivery attempt */
2613 case ECOND_FIRST_DELIVERY:
2614 if (yield) *yield = f.deliver_firsttime == testfor;
2618 /* queue_running tests for any process started by a queue runner */
2620 case ECOND_QUEUE_RUNNING:
2621 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2625 /* exists: tests for file existence
2626 isip: tests for any IP address
2627 isip4: tests for an IPv4 address
2628 isip6: tests for an IPv6 address
2629 pam: does PAM authentication
2630 radius: does RADIUS authentication
2631 ldapauth: does LDAP authentication
2632 pwcheck: does Cyrus SASL pwcheck authentication
2641 case ECOND_LDAPAUTH:
2644 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2646 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2647 if (!sub[0]) return NULL;
2648 /* {-for-text-editors */
2649 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2651 if (!yield) return s; /* No need to run the test if skipping */
2656 if ((expand_forbid & RDO_EXISTS) != 0)
2658 expand_string_message = US"File existence tests are not permitted";
2661 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2667 rc = string_is_ip_address(sub[0], NULL);
2668 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2669 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2672 /* Various authentication tests - all optionally compiled */
2676 rc = auth_call_pam(sub[0], &expand_string_message);
2679 goto COND_FAILED_NOT_COMPILED;
2680 #endif /* SUPPORT_PAM */
2683 #ifdef RADIUS_CONFIG_FILE
2684 rc = auth_call_radius(sub[0], &expand_string_message);
2687 goto COND_FAILED_NOT_COMPILED;
2688 #endif /* RADIUS_CONFIG_FILE */
2690 case ECOND_LDAPAUTH:
2693 /* Just to keep the interface the same */
2695 int old_pool = store_pool;
2696 store_pool = POOL_SEARCH;
2697 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2698 &expand_string_message, &do_cache);
2699 store_pool = old_pool;
2703 goto COND_FAILED_NOT_COMPILED;
2704 #endif /* LOOKUP_LDAP */
2707 #ifdef CYRUS_PWCHECK_SOCKET
2708 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2711 goto COND_FAILED_NOT_COMPILED;
2712 #endif /* CYRUS_PWCHECK_SOCKET */
2714 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2715 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2717 if (rc == ERROR || rc == DEFER) return NULL;
2718 *yield = (rc == OK) == testfor;
2724 /* call ACL (in a conditional context). Accept true, deny false.
2725 Defer is a forced-fail. Anything set by message= goes to $value.
2726 Up to ten parameters are used; we use the braces round the name+args
2727 like the saslauthd condition does, to permit a variable number of args.
2728 See also the expansion-item version EITEM_ACL and the traditional
2729 acl modifier ACLC_ACL.
2730 Since the ACL may allocate new global variables, tell our caller to not
2735 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2741 Uskip_whitespace(&s);
2742 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2744 switch(read_subs(sub, nelem(sub), 1,
2745 &s, yield == NULL, TRUE, name, resetok))
2747 case 1: expand_string_message = US"too few arguments or bracketing "
2750 case 3: return NULL;
2756 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2757 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2762 lookup_value = NULL;
2764 lookup_value = string_copy(user_msg);
2765 *yield = cond == testfor;
2769 f.expand_string_forcedfail = TRUE;
2772 expand_string_message = string_sprintf("%s from acl \"%s\"",
2773 rc_names[rc], sub[0]);
2781 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2783 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2785 However, the last two are optional. That is why the whole set is enclosed
2786 in their own set of braces. */
2788 case ECOND_SASLAUTHD:
2789 #ifndef CYRUS_SASLAUTHD_SOCKET
2790 goto COND_FAILED_NOT_COMPILED;
2794 Uskip_whitespace(&s);
2795 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2796 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name,
2799 case 1: expand_string_message = US"too few arguments or bracketing "
2800 "error for saslauthd";
2802 case 3: return NULL;
2804 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2807 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2808 &expand_string_message);
2809 if (rc == ERROR || rc == DEFER) return NULL;
2810 *yield = (rc == OK) == testfor;
2814 #endif /* CYRUS_SASLAUTHD_SOCKET */
2817 /* symbolic operators for numeric and string comparison, and a number of
2818 other operators, all requiring two arguments.
2820 crypteq: encrypts plaintext and compares against an encrypted text,
2821 using crypt(), crypt16(), MD5 or SHA-1
2822 inlist/inlisti: checks if first argument is in the list of the second
2823 match: does a regular expression match and sets up the numerical
2824 variables if it succeeds
2825 match_address: matches in an address list
2826 match_domain: matches in a domain list
2827 match_ip: matches a host list that is restricted to IP addresses
2828 match_local_part: matches in a local part list
2831 case ECOND_MATCH_ADDRESS:
2832 case ECOND_MATCH_DOMAIN:
2833 case ECOND_MATCH_IP:
2834 case ECOND_MATCH_LOCAL_PART:
2835 #ifndef EXPAND_LISTMATCH_RHS
2836 sub2_honour_dollar = FALSE;
2845 case ECOND_NUM_L: /* Numerical comparisons */
2852 case ECOND_STR_LT: /* String comparisons */
2863 for (int i = 0; i < 2; i++)
2865 /* Sometimes, we don't expand substrings; too many insecure configurations
2866 created using match_address{}{} and friends, where the second param
2867 includes information from untrustworthy sources. */
2868 BOOL honour_dollar = TRUE;
2869 if ((i > 0) && !sub2_honour_dollar)
2870 honour_dollar = FALSE;
2872 if (Uskip_whitespace(&s) != '{')
2874 if (i == 0) goto COND_FAILED_CURLY_START;
2875 expand_string_message = string_sprintf("missing 2nd string in {} "
2876 "after \"%s\"", opname);
2879 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2880 honour_dollar, resetok)))
2882 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2883 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2884 " for security reasons\n");
2885 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2887 /* Convert to numerical if required; we know that the names of all the
2888 conditions that compare numbers do not start with a letter. This just saves
2889 checking for them individually. */
2891 if (!isalpha(opname[0]) && yield)
2896 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2900 num[i] = expanded_string_integer(sub[i], FALSE);
2901 if (expand_string_message) return NULL;
2905 /* Result not required */
2907 if (!yield) return s;
2909 /* Do an appropriate comparison */
2915 tempcond = (num[0] == num[1]);
2919 tempcond = (num[0] > num[1]);
2923 tempcond = (num[0] >= num[1]);
2927 tempcond = (num[0] < num[1]);
2931 tempcond = (num[0] <= num[1]);
2935 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2939 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2943 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2947 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2951 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2955 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2959 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2963 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2967 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2971 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2974 case ECOND_MATCH: /* Regular expression match */
2975 if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror,
2978 expand_string_message = string_sprintf("regular expression error in "
2979 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2982 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2985 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2986 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2987 goto MATCHED_SOMETHING;
2989 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2990 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2991 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2992 goto MATCHED_SOMETHING;
2994 case ECOND_MATCH_IP: /* Match IP address in a host list */
2995 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2997 expand_string_message = string_sprintf("\"%s\" is not an IP address",
3003 unsigned int *nullcache = NULL;
3004 check_host_block cb;
3006 cb.host_name = US"";
3007 cb.host_address = sub[0];
3009 /* If the host address starts off ::ffff: it is an IPv6 address in
3010 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3013 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
3014 cb.host_address + 7 : cb.host_address;
3016 rc = match_check_list(
3017 &sub[1], /* the list */
3018 0, /* separator character */
3019 &hostlist_anchor, /* anchor pointer */
3020 &nullcache, /* cache pointer */
3021 check_host, /* function for testing */
3022 &cb, /* argument for function */
3023 MCL_HOST, /* type of check */
3024 sub[0], /* text for debugging */
3025 NULL); /* where to pass back data */
3027 goto MATCHED_SOMETHING;
3029 case ECOND_MATCH_LOCAL_PART:
3030 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3031 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
3046 expand_string_message = string_sprintf("unable to complete match "
3047 "against \"%s\": %s", sub[1], search_error_message);
3053 /* Various "encrypted" comparisons. If the second string starts with
3054 "{" then an encryption type is given. Default to crypt() or crypt16()
3055 (build-time choice). */
3056 /* }-for-text-editors */
3059 #ifndef SUPPORT_CRYPTEQ
3060 goto COND_FAILED_NOT_COMPILED;
3062 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3064 int sublen = Ustrlen(sub[1]+5);
3069 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3071 /* If the length that we are comparing against is 24, the MD5 digest
3072 is expressed as a base64 string. This is the way LDAP does it. However,
3073 some other software uses a straightforward hex representation. We assume
3074 this if the length is 32. Other lengths fail. */
3078 uschar *coded = b64encode(CUS digest, 16);
3079 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3080 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3081 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3083 else if (sublen == 32)
3086 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3088 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3089 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3090 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3094 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3095 "fail\n crypted=%s\n", sub[1]+5);
3100 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3102 int sublen = Ustrlen(sub[1]+6);
3107 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3109 /* If the length that we are comparing against is 28, assume the SHA1
3110 digest is expressed as a base64 string. If the length is 40, assume a
3111 straightforward hex representation. Other lengths fail. */
3115 uschar *coded = b64encode(CUS digest, 20);
3116 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3117 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3118 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3120 else if (sublen == 40)
3123 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3125 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3126 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3127 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3131 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3132 "fail\n crypted=%s\n", sub[1]+6);
3137 else /* {crypt} or {crypt16} and non-{ at start */
3138 /* }-for-text-editors */
3143 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3148 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3153 else if (sub[1][0] == '{') /* }-for-text-editors */
3155 expand_string_message = string_sprintf("unknown encryption mechanism "
3156 "in \"%s\"", sub[1]);
3162 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3163 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3164 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3168 #define XSTR(s) STR(s)
3169 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3170 " subject=%s\n crypted=%s\n",
3171 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3176 /* If the encrypted string contains fewer than two characters (for the
3177 salt), force failure. Otherwise we get false positives: with an empty
3178 string the yield of crypt() is an empty string! */
3181 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3182 else if (errno == EINVAL)
3186 expand_string_message = string_sprintf("crypt error: %s\n",
3187 US strerror(errno));
3192 #endif /* SUPPORT_CRYPTEQ */
3197 const uschar * list = sub[1];
3199 uschar *save_iterate_item = iterate_item;
3200 int (*compare)(const uschar *, const uschar *);
3202 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3205 compare = cond_type == ECOND_INLISTI
3206 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3208 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3210 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3211 if (compare(sub[0], iterate_item) == 0)
3217 iterate_item = save_iterate_item;
3220 } /* Switch for comparison conditions */
3222 *yield = tempcond == testfor;
3223 return s; /* End of comparison conditions */
3226 /* and/or: computes logical and/or of several conditions */
3230 subcondptr = (yield == NULL) ? NULL : &tempcond;
3231 combined_cond = (cond_type == ECOND_AND);
3233 Uskip_whitespace(&s);
3234 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3238 /* {-for-text-editors */
3239 if (Uskip_whitespace(&s) == '}') break;
3240 if (*s != '{') /* }-for-text-editors */
3242 expand_string_message = string_sprintf("each subcondition "
3243 "inside an \"%s{...}\" condition must be in its own {}", opname);
3247 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3249 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3250 expand_string_message, opname);
3253 Uskip_whitespace(&s);
3255 /* {-for-text-editors */
3258 /* {-for-text-editors */
3259 expand_string_message = string_sprintf("missing } at end of condition "
3260 "inside \"%s\" group", opname);
3265 if (cond_type == ECOND_AND)
3267 combined_cond &= tempcond;
3268 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3269 } /* evaluate any more */
3272 combined_cond |= tempcond;
3273 if (combined_cond) subcondptr = NULL; /* once true, don't */
3274 } /* evaluate any more */
3277 if (yield) *yield = (combined_cond == testfor);
3281 /* forall/forany: iterates a condition with different values */
3283 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3284 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3285 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3286 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3287 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3288 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3292 const uschar * list;
3294 uschar *save_iterate_item = iterate_item;
3296 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3298 Uskip_whitespace(&s);
3299 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3300 if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok)))
3302 /* {-for-text-editors */
3303 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3305 Uskip_whitespace(&s);
3306 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3310 /* Call eval_condition once, with result discarded (as if scanning a
3311 "false" part). This allows us to find the end of the condition, because if
3312 the list it empty, we won't actually evaluate the condition for real. */
3314 if (!(s = eval_condition(sub[1], resetok, NULL)))
3316 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3317 expand_string_message, opname);
3320 Uskip_whitespace(&s);
3322 /* {-for-text-editors */
3325 /* {-for-text-editors */
3326 expand_string_message = string_sprintf("missing } at end of condition "
3327 "inside \"%s\"", opname);
3331 if (yield) *yield = !testfor;
3333 if (is_json) list = dewrap(string_copy(list), US"[]");
3334 while ((iterate_item = is_json
3335 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3338 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3340 expand_string_message =
3341 string_sprintf("%s wrapping string result for extract jsons",
3342 expand_string_message);
3343 iterate_item = save_iterate_item;
3347 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3348 if (!eval_condition(sub[1], resetok, &tempcond))
3350 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3351 expand_string_message, opname);
3352 iterate_item = save_iterate_item;
3355 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3356 tempcond? "true":"false");
3358 if (yield) *yield = (tempcond == testfor);
3359 if (tempcond == is_forany) break;
3362 iterate_item = save_iterate_item;
3367 /* The bool{} expansion condition maps a string to boolean.
3368 The values supported should match those supported by the ACL condition
3369 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3370 of true/false. Note that Router "condition" rules have a different
3371 interpretation, where general data can be used and only a few values
3373 Note that readconf.c boolean matching, for boolean configuration options,
3374 only matches true/yes/false/no.
3375 The bool_lax{} condition matches the Router logic, which is much more
3378 case ECOND_BOOL_LAX:
3384 BOOL boolvalue = FALSE;
3386 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3387 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3388 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3390 case 1: expand_string_message = string_sprintf(
3391 "too few arguments or bracketing error for %s",
3395 case 3: return NULL;
3398 Uskip_whitespace(&t);
3399 if ((len = Ustrlen(t)))
3401 /* trailing whitespace: seems like a good idea to ignore it too */
3403 while (isspace(*t2)) t2--;
3404 if (t2 != (t + len))
3411 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3412 /* logic for the lax case from expand_check_condition(), which also does
3413 expands, and the logic is both short and stable enough that there should
3414 be no maintenance burden from replicating it. */
3418 ? Ustrspn(t+1, "0123456789") == len-1
3419 : Ustrspn(t, "0123456789") == len)
3421 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3422 /* expand_check_condition only does a literal string "0" check */
3423 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3426 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3428 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3430 else if (cond_type == ECOND_BOOL_LAX)
3434 expand_string_message = string_sprintf("unrecognised boolean "
3438 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3439 boolvalue? "true":"false");
3440 if (yield) *yield = (boolvalue == testfor);
3444 #ifdef EXPERIMENTAL_SRS_NATIVE
3445 case ECOND_INBOUND_SRS:
3446 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3453 BOOL boolvalue = FALSE;
3455 switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok))
3457 case 1: expand_string_message = US"too few arguments or bracketing "
3458 "error for inbound_srs";
3460 case 3: return NULL;
3463 /* Match the given local_part against the SRS-encoded pattern */
3465 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$",
3467 if (pcre_exec(re, NULL, CS sub[0], Ustrlen(sub[0]), 0, PCRE_EOPT,
3468 ovec, nelem(ovec)) < 0)
3470 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3474 /* Side-effect: record the decoded recipient */
3476 srs_recipient = string_sprintf("%.*S@%.*S", /* lowercased */
3477 ovec[9]-ovec[8], sub[0] + ovec[8], /* substring 4 */
3478 ovec[7]-ovec[6], sub[0] + ovec[6]); /* substring 3 */
3480 /* If a zero-length secret was given, we're done. Otherwise carry on
3481 and validate the given SRS local_part againt our secret. */
3489 /* check the timestamp */
3492 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3495 gettimeofday(&now, NULL);
3496 now.tv_sec /= 86400; /* days since epoch */
3498 /* Decode substring 2 from base32 to a number */
3500 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3502 uschar * t = Ustrchr(base32_chars, *ss++);
3503 d = d * 32 + (t - base32_chars);
3506 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3508 DEBUG(D_expand) debug_printf("SRS too old\n");
3513 /* check length of substring 1, the offered checksum */
3515 if (ovec[3]-ovec[2] != 4)
3517 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3521 /* Hash the address with our secret, and compare that computed checksum
3522 with the one extracted from the arg */
3524 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3525 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3527 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3533 if (yield) *yield = (boolvalue == testfor);
3536 #endif /*EXPERIMENTAL_SRS_NATIVE*/
3538 /* Unknown condition */
3541 if (!expand_string_message || !*expand_string_message)
3542 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3544 } /* End switch on condition type */
3546 /* Missing braces at start and end of data */
3548 COND_FAILED_CURLY_START:
3549 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3552 COND_FAILED_CURLY_END:
3553 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3557 /* A condition requires code that is not compiled */
3559 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3560 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3561 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3562 COND_FAILED_NOT_COMPILED:
3563 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3572 /*************************************************
3573 * Save numerical variables *
3574 *************************************************/
3576 /* This function is called from items such as "if" that want to preserve and
3577 restore the numbered variables.
3580 save_expand_string points to an array of pointers to set
3581 save_expand_nlength points to an array of ints for the lengths
3583 Returns: the value of expand max to save
3587 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3589 for (int i = 0; i <= expand_nmax; i++)
3591 save_expand_nstring[i] = expand_nstring[i];
3592 save_expand_nlength[i] = expand_nlength[i];
3599 /*************************************************
3600 * Restore numerical variables *
3601 *************************************************/
3603 /* This function restored saved values of numerical strings.
3606 save_expand_nmax the number of strings to restore
3607 save_expand_string points to an array of pointers
3608 save_expand_nlength points to an array of ints
3614 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3615 int *save_expand_nlength)
3617 expand_nmax = save_expand_nmax;
3618 for (int i = 0; i <= expand_nmax; i++)
3620 expand_nstring[i] = save_expand_nstring[i];
3621 expand_nlength[i] = save_expand_nlength[i];
3629 /*************************************************
3630 * Handle yes/no substrings *
3631 *************************************************/
3633 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3634 alternative substrings that depend on whether or not the condition was true,
3635 or the lookup or extraction succeeded. The substrings always have to be
3636 expanded, to check their syntax, but "skipping" is set when the result is not
3637 needed - this avoids unnecessary nested lookups.
3640 skipping TRUE if we were skipping when this item was reached
3641 yes TRUE if the first string is to be used, else use the second
3642 save_lookup a value to put back into lookup_value before the 2nd expansion
3643 sptr points to the input string pointer
3644 yieldptr points to the output growable-string pointer
3645 type "lookup", "if", "extract", "run", "env", "listextract" or
3646 "certextract" for error message
3647 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3650 Returns: 0 OK; lookup_value has been reset to save_lookup
3652 2 expansion failed because of bracketing error
3656 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3657 gstring ** yieldptr, uschar *type, BOOL *resetok)
3660 const uschar *s = *sptr; /* Local value */
3661 uschar *sub1, *sub2;
3662 const uschar * errwhere;
3664 /* If there are no following strings, we substitute the contents of $value for
3665 lookups and for extractions in the success case. For the ${if item, the string
3666 "true" is substituted. In the fail case, nothing is substituted for all three
3669 if (skip_whitespace(&s) == '}')
3673 if (yes && !skipping)
3674 *yieldptr = string_catn(*yieldptr, US"true", 4);
3678 if (yes && lookup_value && !skipping)
3679 *yieldptr = string_cat(*yieldptr, lookup_value);
3680 lookup_value = save_lookup;
3686 /* The first following string must be braced. */
3690 errwhere = US"'yes' part did not start with '{'";
3694 /* Expand the first substring. Forced failures are noticed only if we actually
3695 want this string. Set skipping in the call in the fail case (this will always
3696 be the case if we were already skipping). */
3698 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3699 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3700 f.expand_string_forcedfail = FALSE;
3703 errwhere = US"'yes' part did not end with '}'";
3707 /* If we want the first string, add it to the output */
3710 *yieldptr = string_cat(*yieldptr, sub1);
3712 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3713 $value to what it was at the start of the item, so that it has this value
3714 during the second string expansion. For the call from "if" or "run" to this
3715 function, save_lookup is set to lookup_value, so that this statement does
3718 lookup_value = save_lookup;
3720 /* There now follows either another substring, or "fail", or nothing. This
3721 time, forced failures are noticed only if we want the second string. We must
3722 set skipping in the nested call if we don't want this string, or if we were
3723 already skipping. */
3725 if (skip_whitespace(&s) == '{')
3727 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3728 if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3729 f.expand_string_forcedfail = FALSE;
3732 errwhere = US"'no' part did not start with '{'";
3736 /* If we want the second string, add it to the output */
3739 *yieldptr = string_cat(*yieldptr, sub2);
3742 /* If there is no second string, but the word "fail" is present when the use of
3743 the second string is wanted, set a flag indicating it was a forced failure
3744 rather than a syntactic error. Swallow the terminating } in case this is nested
3745 inside another lookup or if or extract. */
3750 /* deconst cast ok here as source is s anyway */
3751 s = US read_name(name, sizeof(name), s, US"_");
3752 if (Ustrcmp(name, "fail") == 0)
3754 if (!yes && !skipping)
3756 Uskip_whitespace(&s);
3759 errwhere = US"did not close with '}' after forcedfail";
3762 expand_string_message =
3763 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3764 f.expand_string_forcedfail = TRUE;
3770 expand_string_message =
3771 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3776 /* All we have to do now is to check on the final closing brace. */
3778 skip_whitespace(&s);
3781 errwhere = US"did not close with '}'";
3787 /* Update the input pointer value before returning */
3792 /* Get here if there is a bracketing failure */
3793 expand_string_message = string_sprintf(
3794 "curly-bracket problem in conditional yes/no parsing: %s\n"
3795 " remaining string is '%s'", errwhere, --s);
3800 /* Get here for other failures */
3808 /********************************************************
3809 * prvs: Get last three digits of days since Jan 1, 1970 *
3810 ********************************************************/
3812 /* This is needed to implement the "prvs" BATV reverse
3815 Argument: integer "days" offset to add or substract to
3816 or from the current number of days.
3818 Returns: pointer to string containing the last three
3819 digits of the number of days since Jan 1, 1970,
3820 modified by the offset argument, NULL if there
3821 was an error in the conversion.
3826 prvs_daystamp(int day_offset)
3828 uschar *days = store_get(32, FALSE); /* Need at least 24 for cases */
3829 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3830 (time(NULL) + day_offset*86400)/86400);
3831 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3836 /********************************************************
3837 * prvs: perform HMAC-SHA1 computation of prvs bits *
3838 ********************************************************/
3840 /* This is needed to implement the "prvs" BATV reverse
3844 address RFC2821 Address to use
3845 key The key to use (must be less than 64 characters
3847 key_num Single-digit key number to use. Defaults to
3850 Returns: pointer to string containing the first three
3851 bytes of the final hash in hex format, NULL if
3852 there was an error in the process.
3856 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3858 gstring * hash_source;
3861 uschar innerhash[20];
3862 uschar finalhash[20];
3863 uschar innerkey[64];
3864 uschar outerkey[64];
3865 uschar *finalhash_hex;
3870 if (Ustrlen(key) > 64)
3873 hash_source = string_catn(NULL, key_num, 1);
3874 hash_source = string_catn(hash_source, daystamp, 3);
3875 hash_source = string_cat(hash_source, address);
3876 (void) string_from_gstring(hash_source);
3879 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3881 memset(innerkey, 0x36, 64);
3882 memset(outerkey, 0x5c, 64);
3884 for (int i = 0; i < Ustrlen(key); i++)
3886 innerkey[i] ^= key[i];
3887 outerkey[i] ^= key[i];
3890 chash_start(HMAC_SHA1, &h);
3891 chash_mid(HMAC_SHA1, &h, innerkey);
3892 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3894 chash_start(HMAC_SHA1, &h);
3895 chash_mid(HMAC_SHA1, &h, outerkey);
3896 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3898 /* Hashing is deemed sufficient to de-taint any input data */
3900 p = finalhash_hex = store_get(40, FALSE);
3901 for (int i = 0; i < 3; i++)
3903 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3904 *p++ = hex_digits[finalhash[i] & 0x0f];
3908 return finalhash_hex;
3914 /*************************************************
3915 * Join a file onto the output string *
3916 *************************************************/
3918 /* This is used for readfile/readsock and after a run expansion.
3919 It joins the contents of a file onto the output string, globally replacing
3920 newlines with a given string (optionally).
3924 yield pointer to the expandable string struct
3925 eol newline replacement string, or NULL
3927 Returns: new pointer for expandable string, terminated if non-null
3931 cat_file(FILE *f, gstring *yield, uschar *eol)
3933 uschar buffer[1024];
3935 while (Ufgets(buffer, sizeof(buffer), f))
3937 int len = Ustrlen(buffer);
3938 if (eol && buffer[len-1] == '\n') len--;
3939 yield = string_catn(yield, buffer, len);
3940 if (eol && buffer[len])
3941 yield = string_cat(yield, eol);
3944 (void) string_from_gstring(yield);
3951 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
3954 uschar buffer[1024];
3956 /*XXX could we read direct into a pre-grown string? */
3958 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
3959 for (uschar * s = buffer; rc--; s++)
3960 yield = eol && *s == '\n'
3961 ? string_cat(yield, eol) : string_catn(yield, s, 1);
3963 /* We assume that all errors, and any returns of zero bytes,
3964 are actually EOF. */
3966 (void) string_from_gstring(yield);
3972 /*************************************************
3973 * Evaluate numeric expression *
3974 *************************************************/
3976 /* This is a set of mutually recursive functions that evaluate an arithmetic
3977 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3978 these functions that is called from elsewhere is eval_expr, whose interface is:
3981 sptr pointer to the pointer to the string - gets updated
3982 decimal TRUE if numbers are to be assumed decimal
3983 error pointer to where to put an error message - must be NULL on input
3984 endket TRUE if ')' must terminate - FALSE for external call
3986 Returns: on success: the value of the expression, with *error still NULL
3987 on failure: an undefined value, with *error = a message
3990 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3993 static int_eximarith_t
3994 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3997 int_eximarith_t x = eval_op_or(&s, decimal, error);
4002 *error = US"expecting closing parenthesis";
4004 while (isspace(*++s));
4006 *error = US"expecting operator";
4012 static int_eximarith_t
4013 eval_number(uschar **sptr, BOOL decimal, uschar **error)
4019 if (isdigit((c = Uskip_whitespace(&s))))
4022 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4024 switch (tolower(*s))
4027 case 'k': n *= 1024; s++; break;
4028 case 'm': n *= 1024*1024; s++; break;
4029 case 'g': n *= 1024*1024*1024; s++; break;
4031 Uskip_whitespace(&s);
4036 n = eval_expr(&s, decimal, error, 1);
4040 *error = US"expecting number or opening parenthesis";
4048 static int_eximarith_t
4049 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4053 Uskip_whitespace(&s);
4054 if (*s == '+' || *s == '-' || *s == '~')
4057 x = eval_op_unary(&s, decimal, error);
4058 if (op == '-') x = -x;
4059 else if (op == '~') x = ~x;
4062 x = eval_number(&s, decimal, error);
4069 static int_eximarith_t
4070 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4073 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4076 while (*s == '*' || *s == '/' || *s == '%')
4079 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4081 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4082 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4083 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4084 * -N*M is INT_MIN will yield INT_MIN.
4085 * Since we don't support floating point, this is somewhat simpler.
4086 * Ideally, we'd return an error, but since we overflow for all other
4087 * arithmetic, consistency suggests otherwise, but what's the correct value
4088 * to use? There is none.
4089 * The C standard guarantees overflow for unsigned arithmetic but signed
4090 * overflow invokes undefined behaviour; in practice, this is overflow
4091 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4092 * that long/longlong larger than int are available, or we could just work
4093 * with larger types. We should consider whether to guarantee 32bit eval
4094 * and 64-bit working variables, with errors returned. For now ...
4095 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4096 * can just let the other invalid results occur otherwise, as they have
4097 * until now. For this one case, we can coerce.
4099 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4102 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4103 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4113 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4129 static int_eximarith_t
4130 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4133 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4136 while (*s == '+' || *s == '-')
4139 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4141 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4142 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4143 { /* over-conservative check */
4145 ? US"overflow in sum" : US"overflow in difference";
4148 if (op == '+') x += y; else x -= y;
4156 static int_eximarith_t
4157 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4160 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4163 while ((*s == '<' || *s == '>') && s[1] == s[0])
4168 y = eval_op_sum(&s, decimal, error);
4170 if (op == '<') x <<= y; else x >>= y;
4178 static int_eximarith_t
4179 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4182 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4189 y = eval_op_shift(&s, decimal, error);
4199 static int_eximarith_t
4200 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4203 int_eximarith_t x = eval_op_and(&s, decimal, error);
4210 y = eval_op_and(&s, decimal, error);
4220 static int_eximarith_t
4221 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4224 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4231 y = eval_op_xor(&s, decimal, error);
4242 /************************************************/
4243 /* Comparison operation for sort expansion. We need to avoid
4244 re-expanding the fields being compared, so need a custom routine.
4247 cond_type Comparison operator code
4248 leftarg, rightarg Arguments for comparison
4250 Return true iff (leftarg compare rightarg)
4254 sortsbefore(int cond_type, BOOL alpha_cond,
4255 const uschar * leftarg, const uschar * rightarg)
4257 int_eximarith_t l_num, r_num;
4261 l_num = expanded_string_integer(leftarg, FALSE);
4262 if (expand_string_message) return FALSE;
4263 r_num = expanded_string_integer(rightarg, FALSE);
4264 if (expand_string_message) return FALSE;
4268 case ECOND_NUM_G: return l_num > r_num;
4269 case ECOND_NUM_GE: return l_num >= r_num;
4270 case ECOND_NUM_L: return l_num < r_num;
4271 case ECOND_NUM_LE: return l_num <= r_num;
4278 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4279 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4280 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4281 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4282 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4283 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4284 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4285 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4288 return FALSE; /* should not happen */
4292 /*************************************************
4294 *************************************************/
4296 /* Returns either an unchanged string, or the expanded string in stacking pool
4297 store. Interpreted sequences are:
4299 \... normal escaping rules
4300 $name substitutes the variable
4302 ${op:string} operates on the expanded string value
4303 ${item{arg1}{arg2}...} expands the args and then does the business
4304 some literal args are not enclosed in {}
4306 There are now far too many operators and item types to make it worth listing
4307 them here in detail any more.
4309 We use an internal routine recursively to handle embedded substrings. The
4310 external function follows. The yield is NULL if the expansion failed, and there
4311 are two cases: if something collapsed syntactically, or if "fail" was given
4312 as the action on a lookup failure. These can be distinguished by looking at the
4313 variable expand_string_forcedfail, which is TRUE in the latter case.
4315 The skipping flag is set true when expanding a substring that isn't actually
4316 going to be used (after "if" or "lookup") and it prevents lookups from
4317 happening lower down.
4319 Store usage: At start, a store block of the length of the input plus 64
4320 is obtained. This is expanded as necessary by string_cat(), which might have to
4321 get a new block, or might be able to expand the original. At the end of the
4322 function we can release any store above that portion of the yield block that
4323 was actually used. In many cases this will be optimal.
4325 However: if the first item in the expansion is a variable name or header name,
4326 we reset the store before processing it; if the result is in fresh store, we
4327 use that without copying. This is helpful for expanding strings like
4328 $message_headers which can get very long.
4330 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4331 since resetting the store at the end of the expansion will free store that was
4332 allocated by the plugin code as well as the slop after the expanded string. So
4333 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4334 and, given the acl condition, ${if }. This is an unfortunate consequence of
4335 string expansion becoming too powerful.
4338 string the string to be expanded
4339 ket_ends true if expansion is to stop at }
4340 left if not NULL, a pointer to the first character after the
4341 expansion is placed here (typically used with ket_ends)
4342 skipping TRUE for recursive calls when the value isn't actually going
4343 to be used (to allow for optimisation)
4344 honour_dollar TRUE if $ is to be expanded,
4345 FALSE if it's just another character
4346 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4349 Returns: NULL if expansion fails:
4350 expand_string_forcedfail is set TRUE if failure was forced
4351 expand_string_message contains a textual error message
4352 a pointer to the expanded string on success
4356 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
4357 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
4359 rmark reset_point = store_mark();
4360 gstring * yield = string_get(Ustrlen(string) + 64);
4362 const uschar *s = string;
4363 uschar *save_expand_nstring[EXPAND_MAXN+1];
4364 int save_expand_nlength[EXPAND_MAXN+1];
4365 BOOL resetok = TRUE;
4370 debug_printf_indent("/%s: %s\n",
4371 skipping ? "---scanning" : "considering", string);
4373 debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n",
4375 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
4379 f.expand_string_forcedfail = FALSE;
4380 expand_string_message = US"";
4382 if (is_tainted(string))
4384 expand_string_message =
4385 string_sprintf("attempt to expand tainted string '%s'", s);
4386 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4395 /* \ escapes the next character, which must exist, or else
4396 the expansion fails. There's a special escape, \N, which causes
4397 copying of the subject verbatim up to the next \N. Otherwise,
4398 the escapes are the standard set. */
4404 expand_string_message = US"\\ at end of string";
4410 const uschar * t = s + 2;
4411 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
4412 yield = string_catn(yield, t, s - t);
4413 if (*s != 0) s += 2;
4419 ch[0] = string_interpret_escape(&s);
4421 yield = string_catn(yield, ch, 1);
4428 /* Anything other than $ is just copied verbatim, unless we are
4429 looking for a terminating } character. */
4432 if (ket_ends && *s == '}') break;
4434 if (*s != '$' || !honour_dollar)
4436 yield = string_catn(yield, s++, 1);
4440 /* No { after the $ - must be a plain name or a number for string
4441 match variable. There has to be a fudge for variables that are the
4442 names of header fields preceded by "$header_" because header field
4443 names can contain any printing characters except space and colon.
4444 For those that don't like typing this much, "$h_" is a synonym for
4445 "$header_". A non-existent header yields a NULL value; nothing is
4448 if (isalpha((*(++s))))
4455 s = read_name(name, sizeof(name), s, US"_");
4457 /* If this is the first thing to be expanded, release the pre-allocated
4461 g = store_get(sizeof(gstring), FALSE);
4462 else if (yield->ptr == 0)
4464 if (resetok) reset_point = store_reset(reset_point);
4466 reset_point = store_mark();
4467 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
4472 if ( ( *(t = name) == 'h'
4473 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4475 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4478 unsigned flags = *name == 'r' ? FH_WANT_RAW
4479 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4481 uschar * charset = *name == 'b' ? NULL : headers_charset;
4483 s = read_header_name(name, sizeof(name), s);
4484 value = find_header(name, &newsize, flags, charset);
4486 /* If we didn't find the header, and the header contains a closing brace
4487 character, this may be a user error where the terminating colon
4488 has been omitted. Set a flag to adjust the error message in this case.
4489 But there is no error here - nothing gets inserted. */
4493 if (Ustrchr(name, '}')) malformed_header = TRUE;
4500 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4502 expand_string_message =
4503 string_sprintf("unknown variable name \"%s\"", name);
4504 check_variable_error_message(name);
4508 /* If the data is known to be in a new buffer, newsize will be set to the
4509 size of that buffer. If this is the first thing in an expansion string,
4510 yield will be NULL; just point it at the new store instead of copying. Many
4511 expansion strings contain just one reference, so this is a useful
4512 optimization, especially for humungous headers. We need to use a gstring
4513 structure that is not allocated after that new-buffer, else a later store
4514 reset in the middle of the buffer will make it inaccessible. */
4516 len = Ustrlen(value);
4517 if (!yield && newsize != 0)
4520 yield->size = newsize;
4525 yield = string_catn(yield, value, len);
4533 s = read_cnumber(&n, s);
4534 if (n >= 0 && n <= expand_nmax)
4535 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4539 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4541 if (*s != '{') /*}*/
4543 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4547 /* After { there can be various things, but they all start with
4548 an initial word, except for a number for a string match variable. */
4550 if (isdigit((*(++s))))
4553 s = read_cnumber(&n, s); /*{*/
4556 expand_string_message = US"} expected after number";
4559 if (n >= 0 && n <= expand_nmax)
4560 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4566 expand_string_message = US"letter or digit expected after ${"; /*}*/
4570 /* Allow "-" in names to cater for substrings with negative
4571 arguments. Since we are checking for known names after { this is
4574 s = read_name(name, sizeof(name), s, US"_-");
4575 item_type = chop_match(name, item_table, nelem(item_table));
4579 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4580 If the ACL returns accept or reject we return content set by "message ="
4581 There is currently no limit on recursion; this would have us call
4582 acl_check_internal() directly and get a current level from somewhere.
4583 See also the acl expansion condition ECOND_ACL and the traditional
4584 acl modifier ACLC_ACL.
4585 Assume that the function has side-effects on the store that must be preserved.
4589 /* ${acl {name} {arg1}{arg2}...} */
4591 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4595 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name,
4598 case 1: goto EXPAND_FAILED_CURLY;
4600 case 3: goto EXPAND_FAILED;
4602 if (skipping) continue;
4605 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4610 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4612 yield = string_cat(yield, user_msg);
4616 f.expand_string_forcedfail = TRUE;
4619 expand_string_message = string_sprintf("%s from acl \"%s\"",
4620 rc_names[rc], sub[0]);
4625 case EITEM_AUTHRESULTS:
4626 /* ${authresults {mysystemname}} */
4630 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4633 case 1: goto EXPAND_FAILED_CURLY;
4635 case 3: goto EXPAND_FAILED;
4638 yield = string_append(yield, 3,
4639 US"Authentication-Results: ", sub_arg[0], US"; none");
4642 yield = authres_local(yield, sub_arg[0]);
4643 yield = authres_iprev(yield);
4644 yield = authres_smtpauth(yield);
4646 yield = authres_spf(yield);
4648 #ifndef DISABLE_DKIM
4649 yield = authres_dkim(yield);
4651 #ifdef SUPPORT_DMARC
4652 yield = authres_dmarc(yield);
4654 #ifdef EXPERIMENTAL_ARC
4655 yield = authres_arc(yield);
4660 /* Handle conditionals - preserve the values of the numerical expansion
4661 variables in case they get changed by a regular expression match in the
4662 condition. If not, they retain their external settings. At the end
4663 of this "if" section, they get restored to their previous values. */
4668 const uschar *next_s;
4669 int save_expand_nmax =
4670 save_expand_strings(save_expand_nstring, save_expand_nlength);
4672 Uskip_whitespace(&s);
4673 if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond)))
4674 goto EXPAND_FAILED; /* message already set */
4679 debug_printf_indent("|--condition: %.*s\n", (int)(next_s - s), s);
4680 debug_printf_indent("|-----result: %s\n", cond ? "true" : "false");
4684 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4685 "condition: %.*s\n",
4686 (int)(next_s - s), s);
4687 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4688 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
4690 cond ? "true" : "false");
4695 /* The handling of "yes" and "no" result strings is now in a separate
4696 function that is also used by ${lookup} and ${extract} and ${run}. */
4698 switch(process_yesno(
4699 skipping, /* were previously skipping */
4700 cond, /* success/failure indicator */
4701 lookup_value, /* value to reset for string2 */
4702 &s, /* input pointer */
4703 &yield, /* output pointer */
4704 US"if", /* condition type */
4707 case 1: goto EXPAND_FAILED; /* when all is well, the */
4708 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4711 /* Restore external setting of expansion variables for continuation
4714 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4715 save_expand_nlength);
4720 case EITEM_IMAPFOLDER:
4721 { /* ${imapfolder {name}{sep]{specials}} */
4725 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4728 case 1: goto EXPAND_FAILED_CURLY;
4730 case 3: goto EXPAND_FAILED;
4733 if (!sub_arg[1]) /* One argument */
4735 sub_arg[1] = US"/"; /* default separator */
4738 else if (Ustrlen(sub_arg[1]) != 1)
4740 expand_string_message =
4742 "IMAP folder separator must be one character, found \"%s\"",
4749 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4750 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4752 yield = string_cat(yield, encoded);
4758 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4759 expanding an internal string that isn't actually going to be used. All we
4760 need to do is check the syntax, so don't do a lookup at all. Preserve the
4761 values of the numerical expansion variables in case they get changed by a
4762 partial lookup. If not, they retain their external settings. At the end
4763 of this "lookup" section, they get restored to their previous values. */
4767 int stype, partial, affixlen, starflags;
4768 int expand_setup = 0;
4770 uschar *key, *filename;
4771 const uschar * affix, * opts;
4772 uschar *save_lookup_value = lookup_value;
4773 int save_expand_nmax =
4774 save_expand_strings(save_expand_nstring, save_expand_nlength);
4776 if ((expand_forbid & RDO_LOOKUP) != 0)
4778 expand_string_message = US"lookup expansions are not permitted";
4782 /* Get the key we are to look up for single-key+file style lookups.
4783 Otherwise set the key NULL pro-tem. */
4785 if (Uskip_whitespace(&s) == '{') /*}*/
4787 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4788 if (!key) goto EXPAND_FAILED; /*{{*/
4791 expand_string_message = US"missing '}' after lookup key";
4792 goto EXPAND_FAILED_CURLY;
4794 Uskip_whitespace(&s);
4798 /* Find out the type of database */
4802 expand_string_message = US"missing lookup type";
4806 /* The type is a string that may contain special characters of various
4807 kinds. Allow everything except space or { to appear; the actual content
4808 is checked by search_findtype_partial. */ /*}*/
4810 while (*s && *s != '{' && !isspace(*s)) /*}*/
4812 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4815 name[nameptr] = '\0';
4816 Uskip_whitespace(&s);
4818 /* Now check for the individual search type and any partial or default
4819 options. Only those types that are actually in the binary are valid. */
4821 if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4822 &starflags, &opts)) < 0)
4824 expand_string_message = search_error_message;
4828 /* Check that a key was provided for those lookup types that need it,
4829 and was not supplied for those that use the query style. */
4831 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4835 expand_string_message = string_sprintf("missing {key} for single-"
4836 "key \"%s\" lookup", name);
4844 expand_string_message = string_sprintf("a single key was given for "
4845 "lookup type \"%s\", which is not a single-key lookup type", name);
4850 /* Get the next string in brackets and expand it. It is the file name for
4851 single-key+file lookups, and the whole query otherwise. In the case of
4852 queries that also require a file name (e.g. sqlite), the file name comes
4857 expand_string_message = US"missing '{' for lookup file-or-query arg";
4858 goto EXPAND_FAILED_CURLY;
4860 if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
4864 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4865 goto EXPAND_FAILED_CURLY;
4867 Uskip_whitespace(&s);
4869 /* If this isn't a single-key+file lookup, re-arrange the variables
4870 to be appropriate for the search_ functions. For query-style lookups,
4871 there is just a "key", and no file name. For the special query-style +
4872 file types, the query (i.e. "key") starts with a file name. */
4876 Uskip_whitespace(&filename);
4879 if (mac_islookup(stype, lookup_querystyle))
4882 if (*filename == '/')
4884 while (*key && !isspace(*key)) key++;
4885 if (*key) *key++ = '\0';
4891 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4892 the entry was not found. Note that there is no search_close() function.
4893 Files are left open in case of re-use. At suitable places in higher logic,
4894 search_tidyup() is called to tidy all open files. This can save opening
4895 the same file several times. However, files may also get closed when
4896 others are opened, if too many are open at once. The rule is that a
4897 handle should not be used after a second search_open().
4899 Request that a partial search sets up $1 and maybe $2 by passing
4900 expand_setup containing zero. If its value changes, reset expand_nmax,
4901 since new variables will have been set. Note that at the end of this
4902 "lookup" section, the old numeric variables are restored. */
4905 lookup_value = NULL;
4908 void *handle = search_open(filename, stype, 0, NULL, NULL);
4911 expand_string_message = search_error_message;
4914 lookup_value = search_find(handle, filename, key, partial, affix,
4915 affixlen, starflags, &expand_setup, opts);
4916 if (f.search_find_defer)
4918 expand_string_message =
4919 string_sprintf("lookup of \"%s\" gave DEFER: %s",
4920 string_printing2(key, FALSE), search_error_message);
4923 if (expand_setup > 0) expand_nmax = expand_setup;
4926 /* The handling of "yes" and "no" result strings is now in a separate
4927 function that is also used by ${if} and ${extract}. */
4929 switch(process_yesno(
4930 skipping, /* were previously skipping */
4931 lookup_value != NULL, /* success/failure indicator */
4932 save_lookup_value, /* value to reset for string2 */
4933 &s, /* input pointer */
4934 &yield, /* output pointer */
4935 US"lookup", /* condition type */
4938 case 1: goto EXPAND_FAILED; /* when all is well, the */
4939 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4942 /* Restore external setting of expansion variables for carrying on
4943 at this level, and continue. */
4945 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4946 save_expand_nlength);
4950 /* If Perl support is configured, handle calling embedded perl subroutines,
4951 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
4952 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
4953 arguments (defined below). */
4955 #define EXIM_PERL_MAX_ARGS 8
4959 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
4960 "is not included in this binary";
4963 #else /* EXIM_PERL */
4965 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
4968 if ((expand_forbid & RDO_PERL) != 0)
4970 expand_string_message = US"Perl calls are not permitted";
4974 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
4977 case 1: goto EXPAND_FAILED_CURLY;
4979 case 3: goto EXPAND_FAILED;
4982 /* If skipping, we don't actually do anything */
4984 if (skipping) continue;
4986 /* Start the interpreter if necessary */
4988 if (!opt_perl_started)
4991 if (!opt_perl_startup)
4993 expand_string_message = US"A setting of perl_startup is needed when "
4994 "using the Perl interpreter";
4997 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4998 if ((initerror = init_perl(opt_perl_startup)))
5000 expand_string_message =
5001 string_sprintf("error in perl_startup code: %s\n", initerror);
5004 opt_perl_started = TRUE;
5007 /* Call the function */
5009 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5010 new_yield = call_perl_cat(yield, &expand_string_message,
5011 sub_arg[0], sub_arg + 1);
5013 /* NULL yield indicates failure; if the message pointer has been set to
5014 NULL, the yield was undef, indicating a forced failure. Otherwise the
5015 message will indicate some kind of Perl error. */
5019 if (!expand_string_message)
5021 expand_string_message =
5022 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5023 "failure", sub_arg[0]);
5024 f.expand_string_forcedfail = TRUE;
5029 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5030 set during a callback from Perl. */
5032 f.expand_string_forcedfail = FALSE;
5036 #endif /* EXIM_PERL */
5038 /* Transform email address to "prvs" scheme to use
5039 as BATV-signed return path */
5046 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok))
5048 case 1: goto EXPAND_FAILED_CURLY;
5050 case 3: goto EXPAND_FAILED;
5053 /* If skipping, we don't actually do anything */
5054 if (skipping) continue;
5056 /* sub_arg[0] is the address */
5057 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5058 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5060 expand_string_message = US"prvs first argument must be a qualified email address";
5064 /* Calculate the hash. The third argument must be a single-digit
5065 key number, or unset. */
5068 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5070 expand_string_message = US"prvs third argument must be a single digit";
5074 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5077 expand_string_message = US"prvs hmac-sha1 conversion failed";
5081 /* Now separate the domain from the local part */
5084 yield = string_catn(yield, US"prvs=", 5);
5085 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5086 yield = string_catn(yield, prvs_daystamp(7), 3);
5087 yield = string_catn(yield, p, 6);
5088 yield = string_catn(yield, US"=", 1);
5089 yield = string_cat (yield, sub_arg[0]);
5090 yield = string_catn(yield, US"@", 1);
5091 yield = string_cat (yield, domain);
5096 /* Check a prvs-encoded address for validity */
5098 case EITEM_PRVSCHECK:
5105 /* TF: Ugliness: We want to expand parameter 1 first, then set
5106 up expansion variables that are used in the expansion of
5107 parameter 2. So we clone the string for the first
5108 expansion, where we only expand parameter 1.
5110 PH: Actually, that isn't necessary. The read_subs() function is
5111 designed to work this way for the ${if and ${lookup expansions. I've
5115 /* Reset expansion variables */
5116 prvscheck_result = NULL;
5117 prvscheck_address = NULL;
5118 prvscheck_keynum = NULL;
5120 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5122 case 1: goto EXPAND_FAILED_CURLY;
5124 case 3: goto EXPAND_FAILED;
5127 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5130 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5132 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5133 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5134 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5135 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5136 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5138 DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part);
5139 DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num);
5140 DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5141 DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash);
5142 DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain);
5144 /* Set up expansion variables */
5145 g = string_cat (NULL, local_part);
5146 g = string_catn(g, US"@", 1);
5147 g = string_cat (g, domain);
5148 prvscheck_address = string_from_gstring(g);
5149 prvscheck_keynum = string_copy(key_num);
5151 /* Now expand the second argument */
5152 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5154 case 1: goto EXPAND_FAILED_CURLY;
5156 case 3: goto EXPAND_FAILED;
5159 /* Now we have the key and can check the address. */
5161 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5166 expand_string_message = US"hmac-sha1 conversion failed";
5170 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5171 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5173 if (Ustrcmp(p,hash) == 0)
5175 /* Success, valid BATV address. Now check the expiry date. */
5176 uschar *now = prvs_daystamp(0);
5177 unsigned int inow = 0,iexpire = 1;
5179 (void)sscanf(CS now,"%u",&inow);
5180 (void)sscanf(CS daystamp,"%u",&iexpire);
5182 /* When "iexpire" is < 7, a "flip" has occurred.
5183 Adjust "inow" accordingly. */
5184 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5186 if (iexpire >= inow)
5188 prvscheck_result = US"1";
5189 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
5193 prvscheck_result = NULL;
5194 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
5199 prvscheck_result = NULL;
5200 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
5203 /* Now expand the final argument. We leave this till now so that
5204 it can include $prvscheck_result. */
5206 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok))
5208 case 1: goto EXPAND_FAILED_CURLY;
5210 case 3: goto EXPAND_FAILED;
5213 yield = string_cat(yield,
5214 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5216 /* Reset the "internal" variables afterwards, because they are in
5217 dynamic store that will be reclaimed if the expansion succeeded. */
5219 prvscheck_address = NULL;
5220 prvscheck_keynum = NULL;
5223 /* Does not look like a prvs encoded address, return the empty string.
5224 We need to make sure all subs are expanded first, so as to skip over
5227 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5229 case 1: goto EXPAND_FAILED_CURLY;
5231 case 3: goto EXPAND_FAILED;
5237 /* Handle "readfile" to insert an entire file */
5239 case EITEM_READFILE:
5244 if ((expand_forbid & RDO_READFILE) != 0)
5246 expand_string_message = US"file insertions are not permitted";
5250 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5252 case 1: goto EXPAND_FAILED_CURLY;
5254 case 3: goto EXPAND_FAILED;
5257 /* If skipping, we don't actually do anything */
5259 if (skipping) continue;
5261 /* Open the file and read it */
5263 if (!(f = Ufopen(sub_arg[0], "rb")))
5265 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
5269 yield = cat_file(f, yield, sub_arg[1]);
5274 /* Handle "readsocket" to insert data from a socket, either
5275 Inet or Unix domain */
5277 case EITEM_READSOCK:
5279 client_conn_ctx cctx;
5281 int save_ptr = gstring_length(yield);
5284 uschar * sub_arg[4];
5285 uschar * server_name = NULL;
5287 BOOL do_shutdown = TRUE;
5288 BOOL do_tls = FALSE; /* Only set under ! DISABLE_TLS */
5291 if (expand_forbid & RDO_READSOCK)
5293 expand_string_message = US"socket insertions are not permitted";
5297 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5298 because there may be a string for expansion on failure. */
5300 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok))
5302 case 1: goto EXPAND_FAILED_CURLY;
5303 case 2: /* Won't occur: no end check */
5304 case 3: goto EXPAND_FAILED;
5307 /* Grab the request string, if any */
5309 reqstr.data = sub_arg[1];
5310 reqstr.len = Ustrlen(sub_arg[1]);
5312 /* Sort out timeout, if given. The second arg is a list with the first element
5313 being a time value. Any more are options of form "name=value". Currently the
5314 only options recognised are "shutdown" and "tls". */
5318 const uschar * list = sub_arg[2];
5322 if ( !(item = string_nextinlist(&list, &sep, NULL, 0))
5324 || (timeout = readconf_readtime(item, 0, FALSE)) < 0)
5326 expand_string_message = string_sprintf("bad time value %s", item);
5330 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5331 if (Ustrncmp(item, US"shutdown=", 9) == 0)
5332 { if (Ustrcmp(item + 9, US"no") == 0) do_shutdown = FALSE; }
5334 else if (Ustrncmp(item, US"tls=", 4) == 0)
5335 { if (Ustrcmp(item + 9, US"no") != 0) do_tls = TRUE; }
5339 sub_arg[3] = NULL; /* No eol if no timeout */
5341 /* If skipping, we don't actually do anything. Otherwise, arrange to
5342 connect to either an IP or a Unix socket. */
5346 /* Handle an IP (internet) domain */
5348 if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
5353 server_name = sub_arg[0] + 5;
5354 port_name = Ustrrchr(server_name, ':');
5356 /* Sort out the port */
5360 expand_string_message =
5361 string_sprintf("missing port for readsocket %s", sub_arg[0]);
5364 *port_name++ = 0; /* Terminate server name */
5366 if (isdigit(*port_name))
5369 port = Ustrtol(port_name, &end, 0);
5370 if (end != port_name + Ustrlen(port_name))
5372 expand_string_message =
5373 string_sprintf("invalid port number %s", port_name);
5379 struct servent *service_info = getservbyname(CS port_name, "tcp");
5382 expand_string_message = string_sprintf("unknown port \"%s\"",
5386 port = ntohs(service_info->s_port);
5389 /*XXX we trust that the request is idempotent for TFO. Hmm. */
5390 cctx.sock = ip_connectedsocket(SOCK_STREAM, server_name, port, port,
5391 timeout, &host, &expand_string_message,
5392 do_tls ? NULL : &reqstr);
5393 callout_address = NULL;
5400 /* Handle a Unix domain socket */
5404 struct sockaddr_un sockun; /* don't call this "sun" ! */
5407 if ((cctx.sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
5409 expand_string_message = string_sprintf("failed to create socket: %s",
5414 sockun.sun_family = AF_UNIX;
5415 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
5417 server_name = US sockun.sun_path;
5419 sigalrm_seen = FALSE;
5421 rc = connect(cctx.sock, (struct sockaddr *)(&sockun), sizeof(sockun));
5425 expand_string_message = US "socket connect timed out";
5430 expand_string_message = string_sprintf("failed to connect to socket "
5431 "%s: %s", sub_arg[0], strerror(errno));
5434 host.name = server_name;
5435 host.address = US"";
5438 DEBUG(D_expand) debug_printf_indent("connected to socket %s\n", sub_arg[0]);
5443 smtp_connect_args conn_args = {.host = &host };
5444 tls_support tls_dummy = {.sni=NULL};
5447 if (!tls_client_start(&cctx, &conn_args, NULL, &tls_dummy, &errstr))
5449 expand_string_message = string_sprintf("TLS connect failed: %s", errstr);
5455 /* Allow sequencing of test actions */
5456 testharness_pause_ms(100);
5458 /* Write the request string, if not empty or already done */
5462 DEBUG(D_expand) debug_printf_indent("writing \"%s\" to socket\n",
5466 do_tls ? tls_write(cctx.tls_ctx, reqstr.data, reqstr.len, FALSE) :
5468 write(cctx.sock, reqstr.data, reqstr.len)) != reqstr.len)
5470 expand_string_message = string_sprintf("request write to socket "
5471 "failed: %s", strerror(errno));
5476 /* Shut down the sending side of the socket. This helps some servers to
5477 recognise that it is their turn to do some work. Just in case some
5478 system doesn't have this function, make it conditional. */
5481 if (!do_tls && do_shutdown) shutdown(cctx.sock, SHUT_WR);
5484 testharness_pause_ms(100);
5486 /* Now we need to read from the socket, under a timeout. The function
5487 that reads a file can be used. */
5490 fp = fdopen(cctx.sock, "rb");
5491 sigalrm_seen = FALSE;
5495 do_tls ? cat_file_tls(cctx.tls_ctx, yield, sub_arg[3]) :
5497 cat_file(fp, yield, sub_arg[3]);
5503 tls_close(cctx.tls_ctx, TRUE);
5510 /* After a timeout, we restore the pointer in the result, that is,
5511 make sure we add nothing from the socket. */
5515 if (yield) yield->ptr = save_ptr;
5516 expand_string_message = US "socket read timed out";
5521 /* The whole thing has worked (or we were skipping). If there is a
5522 failure string following, we need to skip it. */
5526 if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok))
5530 expand_string_message = US"missing '}' closing failstring for readsocket";
5531 goto EXPAND_FAILED_CURLY;
5533 Uskip_whitespace(&s);
5539 expand_string_message = US"missing '}' closing readsocket";
5540 goto EXPAND_FAILED_CURLY;
5544 /* Come here on failure to create socket, connect socket, write to the
5545 socket, or timeout on reading. If another substring follows, expand and
5546 use it. Otherwise, those conditions give expand errors. */
5549 if (*s != '{') goto EXPAND_FAILED;
5550 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5551 if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok)))
5553 yield = string_cat(yield, arg);
5556 expand_string_message = US"missing '}' closing failstring for readsocket";
5557 goto EXPAND_FAILED_CURLY;
5559 Uskip_whitespace(&s);
5563 /* Handle "run" to execute a program. */
5569 const uschar **argv;
5573 if ((expand_forbid & RDO_RUN) != 0)
5575 expand_string_message = US"running a command is not permitted";
5579 Uskip_whitespace(&s);
5582 expand_string_message = US"missing '{' for command arg of run";
5583 goto EXPAND_FAILED_CURLY;
5585 if (!(arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
5587 Uskip_whitespace(&s);
5590 expand_string_message = US"missing '}' closing command arg of run";
5591 goto EXPAND_FAILED_CURLY;
5594 if (skipping) /* Just pretend it worked when we're skipping */
5597 lookup_value = NULL;
5601 if (!transport_set_up_command(&argv, /* anchor for arg list */
5602 arg, /* raw command */
5603 FALSE, /* don't expand the arguments */
5604 0, /* not relevant when... */
5605 NULL, /* no transporting address */
5606 US"${run} expansion", /* for error messages */
5607 &expand_string_message)) /* where to put error message */
5610 /* Create the child process, making it a group leader. */
5612 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5613 US"expand-run")) < 0)
5615 expand_string_message =
5616 string_sprintf("couldn't create child process: %s", strerror(errno));
5620 /* Nothing is written to the standard input. */
5624 /* Read the pipe to get the command's output into $value (which is kept
5625 in lookup_value). Read during execution, so that if the output exceeds
5626 the OS pipe buffer limit, we don't block forever. Remember to not release
5627 memory just allocated for $value. */
5630 f = fdopen(fd_out, "rb");
5631 sigalrm_seen = FALSE;
5633 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5637 /* Wait for the process to finish, applying the timeout, and inspect its
5638 return code for serious disasters. Simple non-zero returns are passed on.
5641 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5643 if (sigalrm_seen || runrc == -256)
5645 expand_string_message = US"command timed out";
5646 killpg(pid, SIGKILL); /* Kill the whole process group */
5649 else if (runrc == -257)
5650 expand_string_message = string_sprintf("wait() failed: %s",
5654 expand_string_message = string_sprintf("command killed by signal %d",
5661 /* Process the yes/no strings; $value may be useful in both cases */
5663 switch(process_yesno(
5664 skipping, /* were previously skipping */
5665 runrc == 0, /* success/failure indicator */
5666 lookup_value, /* value to reset for string2 */
5667 &s, /* input pointer */
5668 &yield, /* output pointer */
5669 US"run", /* condition type */
5672 case 1: goto EXPAND_FAILED; /* when all is well, the */
5673 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5679 /* Handle character translation for "tr" */
5683 int oldptr = gstring_length(yield);
5687 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5689 case 1: goto EXPAND_FAILED_CURLY;
5691 case 3: goto EXPAND_FAILED;
5694 yield = string_cat(yield, sub[0]);
5695 o2m = Ustrlen(sub[2]) - 1;
5697 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5699 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5703 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5710 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5711 expanded arguments. */
5720 int val[2] = { 0, -1 };
5723 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5724 Ensure that sub[2] is set in the ${length } case. */
5727 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5728 TRUE, name, &resetok))
5730 case 1: goto EXPAND_FAILED_CURLY;
5732 case 3: goto EXPAND_FAILED;
5735 /* Juggle the arguments if there are only two of them: always move the
5736 string to the last position and make ${length{n}{str}} equivalent to
5737 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5743 if (item_type == EITEM_LENGTH)
5750 for (int i = 0; i < 2; i++) if (sub[i])
5752 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5753 if (*ret != 0 || (i != 0 && val[i] < 0))
5755 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5756 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5762 item_type == EITEM_HASH
5763 ? compute_hash(sub[2], val[0], val[1], &len)
5764 : item_type == EITEM_NHASH
5765 ? compute_nhash(sub[2], val[0], val[1], &len)
5766 : extract_substr(sub[2], val[0], val[1], &len);
5769 yield = string_catn(yield, ret, len);
5773 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5774 This code originally contributed by Steve Haslam. It currently supports
5775 the use of MD5 and SHA-1 hashes.
5777 We need some workspace that is large enough to handle all the supported
5778 hash types. Use macros to set the sizes rather than be too elaborate. */
5780 #define MAX_HASHLEN 20
5781 #define MAX_HASHBLOCKLEN 64
5790 int hashlen; /* Number of octets for the hash algorithm's output */
5791 int hashblocklen; /* Number of octets the hash algorithm processes */
5793 unsigned int keylen;
5795 uschar keyhash[MAX_HASHLEN];
5796 uschar innerhash[MAX_HASHLEN];
5797 uschar finalhash[MAX_HASHLEN];
5798 uschar finalhash_hex[2*MAX_HASHLEN];
5799 uschar innerkey[MAX_HASHBLOCKLEN];
5800 uschar outerkey[MAX_HASHBLOCKLEN];
5802 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5804 case 1: goto EXPAND_FAILED_CURLY;
5806 case 3: goto EXPAND_FAILED;
5811 if (Ustrcmp(sub[0], "md5") == 0)
5814 use_base = &md5_base;
5818 else if (Ustrcmp(sub[0], "sha1") == 0)
5821 use_base = &sha1_ctx;
5827 expand_string_message =
5828 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5833 keylen = Ustrlen(keyptr);
5835 /* If the key is longer than the hash block length, then hash the key
5838 if (keylen > hashblocklen)
5840 chash_start(type, use_base);
5841 chash_end(type, use_base, keyptr, keylen, keyhash);
5846 /* Now make the inner and outer key values */
5848 memset(innerkey, 0x36, hashblocklen);
5849 memset(outerkey, 0x5c, hashblocklen);
5851 for (int i = 0; i < keylen; i++)
5853 innerkey[i] ^= keyptr[i];
5854 outerkey[i] ^= keyptr[i];
5857 /* Now do the hashes */
5859 chash_start(type, use_base);
5860 chash_mid(type, use_base, innerkey);
5861 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5863 chash_start(type, use_base);
5864 chash_mid(type, use_base, outerkey);
5865 chash_end(type, use_base, innerhash, hashlen, finalhash);
5867 /* Encode the final hash as a hex string */
5870 for (int i = 0; i < hashlen; i++)
5872 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5873 *p++ = hex_digits[finalhash[i] & 0x0f];
5876 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5877 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5879 yield = string_catn(yield, finalhash_hex, hashlen*2);
5884 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5885 We have to save the numerical variables and restore them afterwards. */
5890 int moffset, moffsetextra, slen;
5893 const uschar *rerror;
5896 int save_expand_nmax =
5897 save_expand_strings(save_expand_nstring, save_expand_nlength);
5899 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5901 case 1: goto EXPAND_FAILED_CURLY;
5903 case 3: goto EXPAND_FAILED;
5906 /* Compile the regular expression */
5908 if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror,
5911 expand_string_message = string_sprintf("regular expression error in "
5912 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
5916 /* Now run a loop to do the substitutions as often as necessary. It ends
5917 when there are no more matches. Take care over matches of the null string;
5918 do the same thing as Perl does. */
5921 slen = Ustrlen(sub[0]);
5922 moffset = moffsetextra = 0;
5927 int ovector[3*(EXPAND_MAXN+1)];
5928 int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra,
5929 PCRE_EOPT | emptyopt, ovector, nelem(ovector));
5932 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5933 is not necessarily the end. We want to repeat the match from one
5934 character further along, but leaving the basic offset the same (for
5935 copying below). We can't be at the end of the string - that was checked
5936 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5937 finished; copy the remaining string and end the loop. */
5947 yield = string_catn(yield, subject+moffset, slen-moffset);
5951 /* Match - set up for expanding the replacement. */
5953 if (n == 0) n = EXPAND_MAXN + 1;
5955 for (int nn = 0; nn < n*2; nn += 2)
5957 expand_nstring[expand_nmax] = subject + ovector[nn];
5958 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
5962 /* Copy the characters before the match, plus the expanded insertion. */
5964 yield = string_catn(yield, subject + moffset, ovector[0] - moffset);
5965 if (!(insert = expand_string(sub[2])))
5967 yield = string_cat(yield, insert);
5969 moffset = ovector[1];
5973 /* If we have matched an empty string, first check to see if we are at
5974 the end of the subject. If so, the loop is over. Otherwise, mimic
5975 what Perl's /g options does. This turns out to be rather cunning. First
5976 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5977 string at the same point. If this fails (picked up above) we advance to
5978 the next character. */
5980 if (ovector[0] == ovector[1])
5982 if (ovector[0] == slen) break;
5983 emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED;
5987 /* All done - restore numerical variables. */
5989 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5990 save_expand_nlength);
5994 /* Handle keyed and numbered substring extraction. If the first argument
5995 consists entirely of digits, then a numerical extraction is assumed. */
5999 int field_number = 1;
6000 BOOL field_number_set = FALSE;
6001 uschar *save_lookup_value = lookup_value;
6003 int save_expand_nmax =
6004 save_expand_strings(save_expand_nstring, save_expand_nlength);
6006 /* On reflection the original behaviour of extract-json for a string
6007 result, leaving it quoted, was a mistake. But it was already published,
6008 hence the addition of jsons. In a future major version, make json
6009 work like josons, and withdraw jsons. */
6011 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6013 /* Check for a format-variant specifier */
6015 if (Uskip_whitespace(&s) != '{') /*}*/
6016 if (Ustrncmp(s, "json", 4) == 0)
6017 if (*(s += 4) == 's')
6018 {fmt = extract_jsons; s++;}
6022 /* While skipping we cannot rely on the data for expansions being
6023 available (eg. $item) hence cannot decide on numeric vs. keyed.
6024 Read a maximum of 5 arguments (including the yes/no) */
6028 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6030 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))
6031 goto EXPAND_FAILED; /*'{'*/
6034 expand_string_message = US"missing '{' for arg of extract";
6035 goto EXPAND_FAILED_CURLY;
6037 Uskip_whitespace(&s);
6039 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6040 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6044 Uskip_whitespace(&s);
6048 expand_string_message = US"missing '}' closing extract";
6049 goto EXPAND_FAILED_CURLY;
6053 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6055 if (Uskip_whitespace(&s) == '{') /*'}'*/
6057 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
6058 goto EXPAND_FAILED; /*'{'*/
6061 expand_string_message = string_sprintf(
6062 "missing '}' closing arg %d of extract", i+1);
6063 goto EXPAND_FAILED_CURLY;
6066 /* After removal of leading and trailing white space, the first
6067 argument must not be empty; if it consists entirely of digits
6068 (optionally preceded by a minus sign), this is a numerical
6069 extraction, and we expect 3 arguments (normal) or 2 (json). */
6077 Uskip_whitespace(&p);
6081 while (len > 0 && isspace(p[len-1])) len--;
6086 expand_string_message = US"first argument of \"extract\" must "
6096 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
6100 if (fmt == extract_basic) j = 3; /* Need 3 args */
6101 field_number_set = TRUE;
6107 expand_string_message = string_sprintf(
6108 "missing '{' for arg %d of extract", i+1);
6109 goto EXPAND_FAILED_CURLY;
6113 /* Extract either the numbered or the keyed substring into $value. If
6114 skipping, just pretend the extraction failed. */
6117 lookup_value = NULL;
6121 lookup_value = field_number_set
6122 ? expand_gettokened(field_number, sub[1], sub[2])
6123 : expand_getkeyed(sub[0], sub[1]);
6130 const uschar * list;
6132 /* Array: Bracket-enclosed and comma-separated.
6133 Object: Brace-enclosed, comma-sep list of name:value pairs */
6135 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6137 expand_string_message =
6138 string_sprintf("%s wrapping %s for extract json",
6139 expand_string_message,
6140 field_number_set ? "array" : "object");
6141 goto EXPAND_FAILED_CURLY;
6145 if (field_number_set)
6147 if (field_number <= 0)
6149 expand_string_message = US"first argument of \"extract\" must "
6150 "be greater than zero";
6153 while (field_number > 0 && (item = json_nextinlist(&list)))
6155 if ((lookup_value = s = item))
6158 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6163 lookup_value = NULL;
6164 while ((item = json_nextinlist(&list)))
6166 /* Item is: string name-sep value. string is quoted.
6167 Dequote the string and compare with the search key. */
6169 if (!(item = dewrap(item, US"\"\"")))
6171 expand_string_message =
6172 string_sprintf("%s wrapping string key for extract json",
6173 expand_string_message);
6174 goto EXPAND_FAILED_CURLY;
6176 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6178 s = item + Ustrlen(item) + 1;
6179 if (Uskip_whitespace(&s) != ':')
6181 expand_string_message =
6182 US"missing object value-separator for extract json";
6183 goto EXPAND_FAILED_CURLY;
6186 Uskip_whitespace(&s);
6194 if ( fmt == extract_jsons
6196 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6198 expand_string_message =
6199 string_sprintf("%s wrapping string result for extract jsons",
6200 expand_string_message);
6201 goto EXPAND_FAILED_CURLY;
6206 /* If no string follows, $value gets substituted; otherwise there can
6207 be yes/no strings, as for lookup or if. */
6209 switch(process_yesno(
6210 skipping, /* were previously skipping */
6211 lookup_value != NULL, /* success/failure indicator */
6212 save_lookup_value, /* value to reset for string2 */
6213 &s, /* input pointer */
6214 &yield, /* output pointer */
6215 US"extract", /* condition type */
6218 case 1: goto EXPAND_FAILED; /* when all is well, the */
6219 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6222 /* All done - restore numerical variables. */
6224 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6225 save_expand_nlength);
6230 /* return the Nth item from a list */
6232 case EITEM_LISTEXTRACT:
6234 int field_number = 1;
6235 uschar *save_lookup_value = lookup_value;
6237 int save_expand_nmax =
6238 save_expand_strings(save_expand_nstring, save_expand_nlength);
6240 /* Read the field & list arguments */
6242 for (int i = 0; i < 2; i++)
6244 if (Uskip_whitespace(&s) != '{') /*'}'*/
6246 expand_string_message = string_sprintf(
6247 "missing '{' for arg %d of listextract", i+1);
6248 goto EXPAND_FAILED_CURLY;
6251 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6252 if (!sub[i]) goto EXPAND_FAILED; /*{*/
6255 expand_string_message = string_sprintf(
6256 "missing '}' closing arg %d of listextract", i+1);
6257 goto EXPAND_FAILED_CURLY;
6260 /* After removal of leading and trailing white space, the first
6261 argument must be numeric and nonempty. */
6269 Uskip_whitespace(&p);
6273 while (len > 0 && isspace(p[len-1])) len--;
6276 if (!*p && !skipping)
6278 expand_string_message = US"first argument of \"listextract\" must "
6288 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6291 expand_string_message = US"first argument of \"listextract\" must "
6299 /* Extract the numbered element into $value. If
6300 skipping, just pretend the extraction failed. */
6302 lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]);
6304 /* If no string follows, $value gets substituted; otherwise there can
6305 be yes/no strings, as for lookup or if. */
6307 switch(process_yesno(
6308 skipping, /* were previously skipping */
6309 lookup_value != NULL, /* success/failure indicator */
6310 save_lookup_value, /* value to reset for string2 */
6311 &s, /* input pointer */
6312 &yield, /* output pointer */
6313 US"listextract", /* condition type */
6316 case 1: goto EXPAND_FAILED; /* when all is well, the */
6317 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6320 /* All done - restore numerical variables. */
6322 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6323 save_expand_nlength);
6328 case EITEM_LISTQUOTE:
6331 switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok))
6333 case 1: goto EXPAND_FAILED_CURLY;
6335 case 3: goto EXPAND_FAILED;
6337 for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6339 if (c == sep) yield = string_catn(yield, sub[1], 1);
6340 yield = string_catn(yield, sub[1], 1);
6346 case EITEM_CERTEXTRACT:
6348 uschar *save_lookup_value = lookup_value;
6350 int save_expand_nmax =
6351 save_expand_strings(save_expand_nstring, save_expand_nlength);
6353 /* Read the field argument */
6354 if (Uskip_whitespace(&s) != '{') /*}*/
6356 expand_string_message = US"missing '{' for field arg of certextract";
6357 goto EXPAND_FAILED_CURLY;
6359 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6360 if (!sub[0]) goto EXPAND_FAILED; /*{*/
6363 expand_string_message = US"missing '}' closing field arg of certextract";
6364 goto EXPAND_FAILED_CURLY;
6366 /* strip spaces fore & aft */
6371 Uskip_whitespace(&p);
6375 while (len > 0 && isspace(p[len-1])) len--;
6379 /* inspect the cert argument */
6380 if (Uskip_whitespace(&s) != '{') /*}*/
6382 expand_string_message = US"missing '{' for cert variable arg of certextract";
6383 goto EXPAND_FAILED_CURLY;
6387 expand_string_message = US"second argument of \"certextract\" must "
6388 "be a certificate variable";
6391 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
6392 if (!sub[1]) goto EXPAND_FAILED; /*{*/
6395 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6396 goto EXPAND_FAILED_CURLY;
6400 lookup_value = NULL;
6403 lookup_value = expand_getcertele(sub[0], sub[1]);
6404 if (*expand_string_message) goto EXPAND_FAILED;
6406 switch(process_yesno(
6407 skipping, /* were previously skipping */
6408 lookup_value != NULL, /* success/failure indicator */
6409 save_lookup_value, /* value to reset for string2 */
6410 &s, /* input pointer */
6411 &yield, /* output pointer */
6412 US"certextract", /* condition type */
6415 case 1: goto EXPAND_FAILED; /* when all is well, the */
6416 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6419 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6420 save_expand_nlength);
6423 #endif /*DISABLE_TLS*/
6425 /* Handle list operations */
6432 int save_ptr = gstring_length(yield);
6433 uschar outsep[2] = { '\0', '\0' };
6434 const uschar *list, *expr, *temp;
6435 uschar *save_iterate_item = iterate_item;
6436 uschar *save_lookup_value = lookup_value;
6438 Uskip_whitespace(&s);
6441 expand_string_message =
6442 string_sprintf("missing '{' for first arg of %s", name);
6443 goto EXPAND_FAILED_CURLY;
6446 if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok)))
6450 expand_string_message =
6451 string_sprintf("missing '}' closing first arg of %s", name);
6452 goto EXPAND_FAILED_CURLY;
6455 if (item_type == EITEM_REDUCE)
6458 Uskip_whitespace(&s);
6461 expand_string_message = US"missing '{' for second arg of reduce";
6462 goto EXPAND_FAILED_CURLY;
6464 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6465 if (!t) goto EXPAND_FAILED;
6469 expand_string_message = US"missing '}' closing second arg of reduce";
6470 goto EXPAND_FAILED_CURLY;
6474 Uskip_whitespace(&s);
6477 expand_string_message =
6478 string_sprintf("missing '{' for last arg of %s", name);
6479 goto EXPAND_FAILED_CURLY;
6484 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6485 if scanning a "false" part). This allows us to find the end of the
6486 condition, because if the list is empty, we won't actually evaluate the
6487 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6488 the normal internal expansion function. */
6490 if (item_type == EITEM_FILTER)
6492 if ((temp = eval_condition(expr, &resetok, NULL)))
6496 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
6500 expand_string_message = string_sprintf("%s inside \"%s\" item",
6501 expand_string_message, name);
6505 Uskip_whitespace(&s);
6508 expand_string_message = string_sprintf("missing } at end of condition "
6509 "or expression inside \"%s\"; could be an unquoted } in the content",
6514 Uskip_whitespace(&s); /*{*/
6517 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6522 /* If we are skipping, we can now just move on to the next item. When
6523 processing for real, we perform the iteration. */
6525 if (skipping) continue;
6526 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6528 *outsep = (uschar)sep; /* Separator as a string */
6530 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6531 name, iterate_item, lookup_value);
6533 if (item_type == EITEM_FILTER)
6536 if (!eval_condition(expr, &resetok, &condresult))
6538 iterate_item = save_iterate_item;
6539 lookup_value = save_lookup_value;
6540 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6541 expand_string_message, name);
6544 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6545 condresult? "true":"false");
6547 temp = iterate_item; /* TRUE => include this item */
6549 continue; /* FALSE => skip this item */
6552 /* EITEM_MAP and EITEM_REDUCE */
6556 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
6560 iterate_item = save_iterate_item;
6561 expand_string_message = string_sprintf("%s inside \"%s\" item",
6562 expand_string_message, name);
6565 if (item_type == EITEM_REDUCE)
6567 lookup_value = t; /* Update the value of $value */
6568 continue; /* and continue the iteration */
6572 /* We reach here for FILTER if the condition is true, always for MAP,
6573 and never for REDUCE. The value in "temp" is to be added to the output
6574 list that is being created, ensuring that any occurrences of the
6575 separator character are doubled. Unless we are dealing with the first
6576 item of the output list, add in a space if the new item begins with the
6577 separator character, or is an empty string. */
6579 if ( yield && yield->ptr != save_ptr
6580 && (temp[0] == *outsep || temp[0] == 0))
6581 yield = string_catn(yield, US" ", 1);
6583 /* Add the string in "temp" to the output list that we are building,
6584 This is done in chunks by searching for the separator character. */
6588 size_t seglen = Ustrcspn(temp, outsep);
6590 yield = string_catn(yield, temp, seglen + 1);
6592 /* If we got to the end of the string we output one character
6593 too many; backup and end the loop. Otherwise arrange to double the
6596 if (temp[seglen] == '\0') { yield->ptr--; break; }
6597 yield = string_catn(yield, outsep, 1);
6601 /* Output a separator after the string: we will remove the redundant
6602 final one at the end. */
6604 yield = string_catn(yield, outsep, 1);
6605 } /* End of iteration over the list loop */
6607 /* REDUCE has generated no output above: output the final value of
6610 if (item_type == EITEM_REDUCE)
6612 yield = string_cat(yield, lookup_value);
6613 lookup_value = save_lookup_value; /* Restore $value */
6616 /* FILTER and MAP generate lists: if they have generated anything, remove
6617 the redundant final separator. Even though an empty item at the end of a
6618 list does not count, this is tidier. */
6620 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6622 /* Restore preserved $item */
6624 iterate_item = save_iterate_item;
6632 const uschar *srclist, *cmp, *xtract;
6633 uschar * opname, * srcitem;
6634 const uschar *dstlist = NULL, *dstkeylist = NULL;
6636 uschar *save_iterate_item = iterate_item;
6638 Uskip_whitespace(&s);
6641 expand_string_message = US"missing '{' for list arg of sort";
6642 goto EXPAND_FAILED_CURLY;
6645 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6646 if (!srclist) goto EXPAND_FAILED;
6649 expand_string_message = US"missing '}' closing list arg of sort";
6650 goto EXPAND_FAILED_CURLY;
6653 Uskip_whitespace(&s);
6656 expand_string_message = US"missing '{' for comparator arg of sort";
6657 goto EXPAND_FAILED_CURLY;
6660 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok);
6661 if (!cmp) goto EXPAND_FAILED;
6664 expand_string_message = US"missing '}' closing comparator arg of sort";
6665 goto EXPAND_FAILED_CURLY;
6668 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6670 if (!expand_string_message)
6671 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6676 case ECOND_NUM_L: case ECOND_NUM_LE:
6677 case ECOND_NUM_G: case ECOND_NUM_GE:
6678 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6679 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6683 expand_string_message = US"comparator not handled for sort";
6687 Uskip_whitespace(&s);
6690 expand_string_message = US"missing '{' for extractor arg of sort";
6691 goto EXPAND_FAILED_CURLY;
6695 if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok)))
6697 xtract = string_copyn(xtract, s - xtract);
6701 expand_string_message = US"missing '}' closing extractor arg of sort";
6702 goto EXPAND_FAILED_CURLY;
6707 expand_string_message = US"missing } at end of \"sort\"";
6711 if (skipping) continue;
6713 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6715 uschar * srcfield, * dstitem;
6716 gstring * newlist = NULL;
6717 gstring * newkeylist = NULL;
6719 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6721 /* extract field for comparisons */
6722 iterate_item = srcitem;
6723 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6727 expand_string_message = string_sprintf(
6728 "field-extract in sort: \"%s\"", xtract);
6732 /* Insertion sort */
6734 /* copy output list until new-item < list-item */
6735 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6739 /* field for comparison */
6740 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6743 /* String-comparator names start with a letter; numeric names do not */
6745 if (sortsbefore(cond_type, isalpha(opname[0]),
6746 srcfield, dstfield))
6748 /* New-item sorts before this dst-item. Append new-item,
6749 then dst-item, then remainder of dst list. */
6751 newlist = string_append_listele(newlist, sep, srcitem);
6752 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6755 newlist = string_append_listele(newlist, sep, dstitem);
6756 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6758 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6759 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6761 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6763 newlist = string_append_listele(newlist, sep, dstitem);
6764 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6770 newlist = string_append_listele(newlist, sep, dstitem);
6771 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6774 /* If we ran out of dstlist without consuming srcitem, append it */
6777 newlist = string_append_listele(newlist, sep, srcitem);
6778 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6781 dstlist = newlist->s;
6782 dstkeylist = newkeylist->s;
6784 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6785 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6789 yield = string_cat(yield, dstlist);
6791 /* Restore preserved $item */
6792 iterate_item = save_iterate_item;
6796 expand_string_message = US"Internal error in sort (list mismatch)";
6801 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6802 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6803 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6804 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6806 #define EXPAND_DLFUNC_MAX_ARGS 8
6809 #ifndef EXPAND_DLFUNC
6810 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6811 "is not included in this binary";
6814 #else /* EXPAND_DLFUNC */
6817 exim_dlfunc_t *func;
6820 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6822 if ((expand_forbid & RDO_DLFUNC) != 0)
6824 expand_string_message =
6825 US"dynamically-loaded functions are not permitted";
6829 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6830 TRUE, name, &resetok))
6832 case 1: goto EXPAND_FAILED_CURLY;
6834 case 3: goto EXPAND_FAILED;
6837 /* If skipping, we don't actually do anything */
6839 if (skipping) continue;
6841 /* Look up the dynamically loaded object handle in the tree. If it isn't
6842 found, dlopen() the file and put the handle in the tree for next time. */
6844 if (!(t = tree_search(dlobj_anchor, argv[0])))
6846 void *handle = dlopen(CS argv[0], RTLD_LAZY);
6849 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6850 argv[0], dlerror());
6851 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6854 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), is_tainted(argv[0]));
6855 Ustrcpy(t->name, argv[0]);
6856 t->data.ptr = handle;
6857 (void)tree_insertnode(&dlobj_anchor, t);
6860 /* Having obtained the dynamically loaded object handle, look up the
6861 function pointer. */
6863 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6865 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6866 "%s", argv[1], argv[0], dlerror());
6867 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6871 /* Call the function and work out what to do with the result. If it
6872 returns OK, we have a replacement string; if it returns DEFER then
6873 expansion has failed in a non-forced manner; if it returns FAIL then
6874 failure was forced; if it returns ERROR or any other value there's a
6875 problem, so panic slightly. In any case, assume that the function has
6876 side-effects on the store that must be preserved. */
6880 for (argc = 0; argv[argc]; argc++);
6881 status = func(&result, argc - 2, &argv[2]);
6884 if (!result) result = US"";
6885 yield = string_cat(yield, result);
6890 expand_string_message = result ? result : US"(no message)";
6891 if (status == FAIL_FORCED)
6892 f.expand_string_forcedfail = TRUE;
6893 else if (status != FAIL)
6894 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6895 argv[0], argv[1], status, expand_string_message);
6899 #endif /* EXPAND_DLFUNC */
6901 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6904 uschar *save_lookup_value = lookup_value;
6906 if (Uskip_whitespace(&s) != '{') /*}*/
6909 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6910 if (!key) goto EXPAND_FAILED; /*{*/
6913 expand_string_message = US"missing '{' for name arg of env";
6914 goto EXPAND_FAILED_CURLY;
6917 lookup_value = US getenv(CS key);
6919 switch(process_yesno(
6920 skipping, /* were previously skipping */
6921 lookup_value != NULL, /* success/failure indicator */
6922 save_lookup_value, /* value to reset for string2 */
6923 &s, /* input pointer */
6924 &yield, /* output pointer */
6925 US"env", /* condition type */
6928 case 1: goto EXPAND_FAILED; /* when all is well, the */
6929 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6934 #ifdef EXPERIMENTAL_SRS_NATIVE
6935 case EITEM_SRS_ENCODE:
6936 /* ${srs_encode {secret} {return_path} {orig_domain}} */
6941 switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok))
6943 case 1: goto EXPAND_FAILED_CURLY;
6945 case 3: goto EXPAND_FAILED;
6948 yield = string_catn(yield, US"SRS0=", 5);
6950 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
6951 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
6952 yield = string_catn(yield, cksum, sizeof(cksum));
6953 yield = string_catn(yield, US"=", 1);
6955 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
6961 gettimeofday(&now, NULL);
6962 for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5)
6963 g = string_catn(g, &base32_chars[i & 0x1f], 1);
6964 if (g) while (g->ptr > 0)
6965 yield = string_catn(yield, &g->s[--g->ptr], 1);
6967 yield = string_catn(yield, US"=", 1);
6969 /* ${domain:$return_path}=${local_part:$return_path} */
6971 int start, end, domain;
6972 uschar * t = parse_extract_address(sub[1], &expand_string_message,
6973 &start, &end, &domain, FALSE);
6977 if (domain > 0) yield = string_cat(yield, t + domain);
6978 yield = string_catn(yield, US"=", 1);
6980 ? string_catn(yield, t, domain - 1) : string_cat(yield, t);
6983 /* @$original_domain */
6984 yield = string_catn(yield, US"@", 1);
6985 yield = string_cat(yield, sub[2]);
6988 #endif /*EXPERIMENTAL_SRS_NATIVE*/
6989 } /* EITEM_* switch */
6991 /* Control reaches here if the name is not recognized as one of the more
6992 complicated expansion items. Check for the "operator" syntax (name terminated
6993 by a colon). Some of the operators have arguments, separated by _ from the
7002 var_entry *vp = NULL;
7005 /* Owing to an historical mis-design, an underscore may be part of the
7006 operator name, or it may introduce arguments. We therefore first scan the
7007 table of names that contain underscores. If there is no match, we cut off
7008 the arguments and then scan the main table. */
7010 if ((c = chop_match(name, op_table_underscore,
7011 nelem(op_table_underscore))) < 0)
7013 if ((arg = Ustrchr(name, '_')))
7015 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7016 c += nelem(op_table_underscore);
7017 if (arg) *arg++ = '_'; /* Put back for error messages */
7020 /* Deal specially with operators that might take a certificate variable
7021 as we do not want to do the usual expansion. For most, expand the string.*/
7031 const uschar * s1 = s;
7032 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
7034 if (!sub) goto EXPAND_FAILED; /*{*/
7037 expand_string_message =
7038 string_sprintf("missing '}' closing cert arg of %s", name);
7039 goto EXPAND_FAILED_CURLY;
7041 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7051 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
7052 if (!sub) goto EXPAND_FAILED;
7057 /* If we are skipping, we don't need to perform the operation at all.
7058 This matters for operations like "mask", because the data may not be
7059 in the correct format when skipping. For example, the expression may test
7060 for the existence of $sender_host_address before trying to mask it. For
7061 other operations, doing them may not fail, but it is a waste of time. */
7063 if (skipping && c >= 0) continue;
7065 /* Otherwise, switch on the operator type */
7072 unsigned long int n = Ustrtoul(sub, &t, 10);
7077 expand_string_message = string_sprintf("argument for base32 "
7078 "operator is \"%s\", which is not a decimal number", sub);
7082 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7084 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7091 unsigned long int n = 0;
7094 uschar * t = Ustrchr(base32_chars, *tt++);
7097 expand_string_message = string_sprintf("argument for base32d "
7098 "operator is \"%s\", which is not a base 32 number", sub);
7101 n = n * 32 + (t - base32_chars);
7103 yield = string_fmt_append(yield, "%ld", n);
7110 unsigned long int n = Ustrtoul(sub, &t, 10);
7113 expand_string_message = string_sprintf("argument for base62 "
7114 "operator is \"%s\", which is not a decimal number", sub);
7117 yield = string_cat(yield, string_base62(n));
7121 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7126 unsigned long int n = 0;
7129 uschar *t = Ustrchr(base62_chars, *tt++);
7132 expand_string_message = string_sprintf("argument for base62d "
7133 "operator is \"%s\", which is not a base %d number", sub,
7137 n = n * BASE_62 + (t - base62_chars);
7139 yield = string_fmt_append(yield, "%ld", n);
7144 /* This is purely for the convenience of the test harness. Do not enable
7145 it otherwise as it defeats the taint-checking security. */
7147 if (f.running_in_test_harness)
7148 yield = string_cat(yield, is_tainted(sub)
7149 ? string_copy_taint(sub, FALSE) : sub);
7152 DEBUG(D_expand) debug_printf_indent("bless operator not supported\n");
7153 yield = string_cat(yield, sub);
7159 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
7162 expand_string_message =
7163 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7164 expand_string_message);
7167 yield = string_cat(yield, expanded);
7174 uschar *t = sub - 1;
7175 while (*(++t) != 0) { *t = tolower(*t); count++; }
7176 yield = string_catn(yield, sub, count);
7183 uschar *t = sub - 1;
7184 while (*(++t) != 0) { *t = toupper(*t); count++; }
7185 yield = string_catn(yield, sub, count);
7191 if (vp && *(void **)vp->value)
7193 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7194 yield = string_cat(yield, cp);
7202 md5_end(&base, sub, Ustrlen(sub), digest);
7203 for (int j = 0; j < 16; j++)
7204 yield = string_fmt_append(yield, "%02x", digest[j]);
7210 if (vp && *(void **)vp->value)
7212 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7213 yield = string_cat(yield, cp);
7221 sha1_end(&h, sub, Ustrlen(sub), digest);
7222 for (int j = 0; j < 20; j++)
7223 yield = string_fmt_append(yield, "%02X", digest[j]);
7229 #ifdef EXIM_HAVE_SHA2
7230 if (vp && *(void **)vp->value)
7231 if (c == EOP_SHA256)
7232 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7234 expand_string_message = US"sha2_N not supported with certificates";
7239 hashmethod m = !arg ? HASH_SHA2_256
7240 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7241 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7242 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7245 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7247 expand_string_message = US"unrecognised sha2 variant";
7251 exim_sha_update(&h, sub, Ustrlen(sub));
7252 exim_sha_finish(&h, &b);
7254 yield = string_fmt_append(yield, "%02X", *b.data++);
7257 expand_string_message = US"sha256 only supported with TLS";
7262 #ifdef EXIM_HAVE_SHA3
7266 hashmethod m = !arg ? HASH_SHA3_256
7267 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7268 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7269 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7270 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7273 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7275 expand_string_message = US"unrecognised sha3 variant";
7279 exim_sha_update(&h, sub, Ustrlen(sub));
7280 exim_sha_finish(&h, &b);
7282 yield = string_fmt_append(yield, "%02X", *b.data++);
7286 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7290 /* Convert hex encoding to base64 encoding */
7300 for (enc = sub; *enc; enc++)
7302 if (!isxdigit(*enc))
7304 expand_string_message = string_sprintf("\"%s\" is not a hex "
7313 expand_string_message = string_sprintf("\"%s\" contains an odd "
7314 "number of characters", sub);
7318 while ((c = *in++) != 0)
7320 if (isdigit(c)) c -= '0';
7321 else c = toupper(c) - 'A' + 10;
7331 enc = b64encode(CUS sub, out - sub);
7332 yield = string_cat(yield, enc);
7336 /* Convert octets outside 0x21..0x7E to \xXX form */
7340 uschar *t = sub - 1;
7343 if (*t < 0x21 || 0x7E < *t)
7344 yield = string_fmt_append(yield, "\\x%02x", *t);
7346 yield = string_catn(yield, t, 1);
7351 /* count the number of list elements */
7359 while (string_nextinlist(CUSS &sub, &sep, buffer, sizeof(buffer))) cnt++;
7360 yield = string_fmt_append(yield, "%d", cnt);
7364 /* expand a named list given the name */
7365 /* handles nested named lists; requotes as colon-sep list */
7369 tree_node *t = NULL;
7370 const uschar * list;
7373 uschar * suffix = US"";
7374 BOOL needsep = FALSE;
7377 if (*sub == '+') sub++;
7378 if (!arg) /* no-argument version */
7380 if (!(t = tree_search(addresslist_anchor, sub)) &&
7381 !(t = tree_search(domainlist_anchor, sub)) &&
7382 !(t = tree_search(hostlist_anchor, sub)))
7383 t = tree_search(localpartlist_anchor, sub);
7385 else switch(*arg) /* specific list-type version */
7387 case 'a': t = tree_search(addresslist_anchor, sub); suffix = US"_a"; break;
7388 case 'd': t = tree_search(domainlist_anchor, sub); suffix = US"_d"; break;
7389 case 'h': t = tree_search(hostlist_anchor, sub); suffix = US"_h"; break;
7390 case 'l': t = tree_search(localpartlist_anchor, sub); suffix = US"_l"; break;
7392 expand_string_message = US"bad suffix on \"list\" operator";
7398 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
7400 : *arg=='a'?"address "
7401 : *arg=='d'?"domain "
7403 : *arg=='l'?"localpart "
7408 list = ((namedlist_block *)(t->data.ptr))->string;
7410 while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
7412 uschar * buf = US" : ";
7414 yield = string_catn(yield, buf, 3);
7418 if (*item == '+') /* list item is itself a named list */
7420 uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item);
7421 item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE, &resetok);
7423 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
7427 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
7428 while ((cp= strpbrk(CCS item, tok)))
7430 yield = string_catn(yield, item, cp - CS item);
7431 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
7433 yield = string_catn(yield, US"::", 2);
7436 else /* sep in item; should already be doubled; emit once */
7438 yield = string_catn(yield, US tok, 1);
7439 if (*cp == sep) cp++;
7444 yield = string_cat(yield, item);
7449 /* quote a list-item for the given list-separator */
7451 /* mask applies a mask to an IP address; for example the result of
7452 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7459 int mask, maskoffset;
7460 int type = string_is_ip_address(sub, &maskoffset);
7465 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7470 if (maskoffset == 0)
7472 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7477 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7479 if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128))
7481 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7486 /* Convert the address to binary integer(s) and apply the mask */
7488 sub[maskoffset] = 0;
7489 count = host_aton(sub, binary);
7490 host_mask(count, binary, mask);
7492 /* Convert to masked textual format and add to output. */
7494 yield = string_catn(yield, buffer,
7495 host_nmtoa(count, binary, mask, buffer, '.'));
7500 case EOP_IPV6DENORM:
7502 int type = string_is_ip_address(sub, NULL);
7509 (void) host_aton(sub, binary);
7512 case 4: /* convert to IPv4-mapped IPv6 */
7513 binary[0] = binary[1] = 0;
7514 binary[2] = 0x0000ffff;
7515 (void) host_aton(sub, binary+3);
7519 expand_string_message =
7520 string_sprintf("\"%s\" is not an IP address", sub);
7524 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7525 ? ipv6_nmtoa(binary, buffer)
7526 : host_nmtoa(4, binary, -1, buffer, ':')
7532 case EOP_LOCAL_PART:
7536 int start, end, domain;
7537 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7540 if (c != EOP_DOMAIN)
7541 yield = c == EOP_LOCAL_PART && domain > 0
7542 ? string_catn(yield, t, domain - 1)
7543 : string_cat(yield, t);
7544 else if (domain > 0)
7545 yield = string_cat(yield, t + domain);
7551 uschar outsep[2] = { ':', '\0' };
7552 uschar *address, *error;
7553 int save_ptr = gstring_length(yield);
7554 int start, end, domain; /* Not really used */
7556 if (Uskip_whitespace(&sub) == '>')
7557 if (*outsep = *++sub) ++sub;
7560 expand_string_message = string_sprintf("output separator "
7561 "missing in expanding ${addresses:%s}", --sub);
7564 f.parse_allow_group = TRUE;
7568 uschar * p = parse_find_address_end(sub, FALSE);
7569 uschar saveend = *p;
7571 address = parse_extract_address(sub, &error, &start, &end, &domain,
7575 /* Add the address to the output list that we are building. This is
7576 done in chunks by searching for the separator character. At the
7577 start, unless we are dealing with the first address of the output
7578 list, add in a space if the new address begins with the separator
7579 character, or is an empty string. */
7583 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7584 yield = string_catn(yield, US" ", 1);
7588 size_t seglen = Ustrcspn(address, outsep);
7589 yield = string_catn(yield, address, seglen + 1);
7591 /* If we got to the end of the string we output one character
7594 if (address[seglen] == '\0') { yield->ptr--; break; }
7595 yield = string_catn(yield, outsep, 1);
7596 address += seglen + 1;
7599 /* Output a separator after the string: we will remove the
7600 redundant final one at the end. */
7602 yield = string_catn(yield, outsep, 1);
7605 if (saveend == '\0') break;
7609 /* If we have generated anything, remove the redundant final
7612 if (yield && yield->ptr != save_ptr) yield->ptr--;
7613 f.parse_allow_group = FALSE;
7618 /* quote puts a string in quotes if it is empty or contains anything
7619 other than alphamerics, underscore, dot, or hyphen.
7621 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7622 be quoted in order to be a valid local part.
7624 In both cases, newlines and carriage returns are converted into \n and \r
7628 case EOP_QUOTE_LOCAL_PART:
7631 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7632 uschar *t = sub - 1;
7636 while (!needs_quote && *(++t) != 0)
7637 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7639 else /* EOP_QUOTE_LOCAL_PART */
7641 while (!needs_quote && *(++t) != 0)
7642 needs_quote = !isalnum(*t) &&
7643 strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
7644 (*t != '.' || t == sub || t[1] == 0);
7649 yield = string_catn(yield, US"\"", 1);
7654 yield = string_catn(yield, US"\\n", 2);
7655 else if (*t == '\r')
7656 yield = string_catn(yield, US"\\r", 2);
7659 if (*t == '\\' || *t == '"')
7660 yield = string_catn(yield, US"\\", 1);
7661 yield = string_catn(yield, t, 1);
7664 yield = string_catn(yield, US"\"", 1);
7666 else yield = string_cat(yield, sub);
7670 /* quote_lookuptype does lookup-specific quoting */
7675 uschar *opt = Ustrchr(arg, '_');
7677 if (opt) *opt++ = 0;
7679 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7681 expand_string_message = search_error_message;
7685 if (lookup_list[n]->quote)
7686 sub = (lookup_list[n]->quote)(sub, opt);
7692 expand_string_message = string_sprintf(
7693 "\"%s\" unrecognized after \"${quote_%s\"",
7698 yield = string_cat(yield, sub);
7702 /* rx quote sticks in \ before any non-alphameric character so that
7703 the insertion works in a regular expression. */
7707 uschar *t = sub - 1;
7711 yield = string_catn(yield, US"\\", 1);
7712 yield = string_catn(yield, t, 1);
7717 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7718 prescribed by the RFC, if there are characters that need to be encoded */
7722 uschar buffer[2048];
7723 yield = string_cat(yield,
7724 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7725 buffer, sizeof(buffer), FALSE));
7729 /* RFC 2047 decode */
7735 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7736 headers_charset, '?', &len, &error);
7739 expand_string_message = error;
7742 yield = string_catn(yield, decoded, len);
7746 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7751 uschar * buff = store_get(4, is_tainted(sub));
7756 if (c > 255) c = '_';
7758 yield = string_catn(yield, buff, 1);
7763 /* replace illegal UTF-8 sequences by replacement character */
7765 #define UTF8_REPLACEMENT_CHAR US"?"
7769 int seq_len = 0, index = 0;
7771 long codepoint = -1;
7773 uschar seq_buff[4]; /* accumulate utf-8 here */
7775 /* Manually track tainting, as we deal in individual chars below */
7777 if (is_tainted(sub))
7778 if (yield->s && yield->ptr)
7779 gstring_rebuffer(yield);
7781 yield->s = store_get(yield->size = Ustrlen(sub), TRUE);
7783 /* Check the UTF-8, byte-by-byte */
7792 if ((c & 0xc0) != 0x80)
7793 /* wrong continuation byte; invalidate all bytes */
7794 complete = 1; /* error */
7797 codepoint = (codepoint << 6) | (c & 0x3f);
7798 seq_buff[index++] = c;
7799 if (--bytes_left == 0) /* codepoint complete */
7800 if(codepoint > 0x10FFFF) /* is it too large? */
7801 complete = -1; /* error (RFC3629 limit) */
7803 { /* finished; output utf-8 sequence */
7804 yield = string_catn(yield, seq_buff, seq_len);
7809 else /* no bytes left: new sequence */
7811 if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7813 yield = string_catn(yield, &c, 1);
7816 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7818 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7823 codepoint = c & 0x1f;
7826 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7829 codepoint = c & 0x0f;
7831 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7834 codepoint = c & 0x07;
7836 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7839 seq_buff[index++] = c;
7840 seq_len = bytes_left + 1;
7841 } /* if(bytes_left) */
7845 bytes_left = index = 0;
7846 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7848 if ((complete == 1) && ((c & 0x80) == 0))
7849 /* ASCII character follows incomplete sequence */
7850 yield = string_catn(yield, &c, 1);
7852 /* If given a sequence truncated mid-character, we also want to report ?
7853 * Eg, ${length_1:フィル} is one byte, not one character, so we expect
7854 * ${utf8clean:${length_1:フィル}} to yield '?' */
7855 if (bytes_left != 0)
7856 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7862 case EOP_UTF8_DOMAIN_TO_ALABEL:
7864 uschar * error = NULL;
7865 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7868 expand_string_message = string_sprintf(
7869 "error converting utf8 (%s) to alabel: %s",
7870 string_printing(sub), error);
7873 yield = string_cat(yield, s);
7877 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7879 uschar * error = NULL;
7880 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7883 expand_string_message = string_sprintf(
7884 "error converting alabel (%s) to utf8: %s",
7885 string_printing(sub), error);
7888 yield = string_cat(yield, s);
7892 case EOP_UTF8_LOCALPART_TO_ALABEL:
7894 uschar * error = NULL;
7895 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7898 expand_string_message = string_sprintf(
7899 "error converting utf8 (%s) to alabel: %s",
7900 string_printing(sub), error);
7903 yield = string_cat(yield, s);
7904 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7908 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7910 uschar * error = NULL;
7911 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7914 expand_string_message = string_sprintf(
7915 "error converting alabel (%s) to utf8: %s",
7916 string_printing(sub), error);
7919 yield = string_cat(yield, s);
7922 #endif /* EXPERIMENTAL_INTERNATIONAL */
7924 /* escape turns all non-printing characters into escape sequences. */
7928 const uschar * t = string_printing(sub);
7929 yield = string_cat(yield, t);
7933 case EOP_ESCAPE8BIT:
7937 for (const uschar * s = sub; (c = *s); s++)
7938 yield = c < 127 && c != '\\'
7939 ? string_catn(yield, s, 1)
7940 : string_fmt_append(yield, "\\%03o", c);
7944 /* Handle numeric expression evaluation */
7949 uschar *save_sub = sub;
7950 uschar *error = NULL;
7951 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7954 expand_string_message = string_sprintf("error in expression "
7955 "evaluation: %s (after processing \"%.*s\")", error,
7956 (int)(sub-save_sub), save_sub);
7959 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
7963 /* Handle time period formatting */
7967 int n = readconf_readtime(sub, 0, FALSE);
7970 expand_string_message = string_sprintf("string \"%s\" is not an "
7971 "Exim time interval in \"%s\" operator", sub, name);
7974 yield = string_fmt_append(yield, "%d", n);
7978 case EOP_TIME_INTERVAL:
7981 uschar *t = read_number(&n, sub);
7982 if (*t != 0) /* Not A Number*/
7984 expand_string_message = string_sprintf("string \"%s\" is not a "
7985 "positive number in \"%s\" operator", sub, name);
7988 t = readconf_printtime(n);
7989 yield = string_cat(yield, t);
7993 /* Convert string to base64 encoding */
7999 uschar * s = vp && *(void **)vp->value
8000 ? tls_cert_der_b64(*(void **)vp->value)
8001 : b64encode(CUS sub, Ustrlen(sub));
8003 uschar * s = b64encode(CUS sub, Ustrlen(sub));
8005 yield = string_cat(yield, s);
8012 int len = b64decode(sub, &s);
8015 expand_string_message = string_sprintf("string \"%s\" is not "
8016 "well-formed for \"%s\" operator", sub, name);
8019 yield = string_cat(yield, s);
8023 /* strlen returns the length of the string */
8026 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
8029 /* length_n or l_n takes just the first n characters or the whole string,
8030 whichever is the shorter;
8032 substr_m_n, and s_m_n take n characters from offset m; negative m take
8033 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
8034 takes the rest, either to the right or to the left.
8036 hash_n or h_n makes a hash of length n from the string, yielding n
8037 characters from the set a-z; hash_n_m makes a hash of length n, but
8038 uses m characters from the set a-zA-Z0-9.
8040 nhash_n returns a single number between 0 and n-1 (in text form), while
8041 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
8042 between 0 and n-1 and the second between 0 and m-1. */
8062 expand_string_message = string_sprintf("missing values after %s",
8067 /* "length" has only one argument, effectively being synonymous with
8070 if (c == EOP_LENGTH || c == EOP_L)
8076 /* The others have one or two arguments; for "substr" the first may be
8077 negative. The second being negative means "not supplied". */
8082 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8085 /* Read up to two numbers, separated by underscores */
8090 if (arg != ret && *arg == '_' && pn == &value1)
8094 if (arg[1] != 0) arg++;
8096 else if (!isdigit(*arg))
8098 expand_string_message =
8099 string_sprintf("non-digit after underscore in \"%s\"", name);
8102 else *pn = (*pn)*10 + *arg++ - '0';
8106 /* Perform the required operation */
8108 ret = c == EOP_HASH || c == EOP_H
8109 ? compute_hash(sub, value1, value2, &len)
8110 : c == EOP_NHASH || c == EOP_NH
8111 ? compute_nhash(sub, value1, value2, &len)
8112 : extract_substr(sub, value1, value2, &len);
8113 if (!ret) goto EXPAND_FAILED;
8115 yield = string_catn(yield, ret, len);
8124 uschar **modetable[3];
8128 if (expand_forbid & RDO_EXISTS)
8130 expand_string_message = US"Use of the stat() expansion is not permitted";
8134 if (stat(CS sub, &st) < 0)
8136 expand_string_message = string_sprintf("stat(%s) failed: %s",
8137 sub, strerror(errno));
8141 switch (mode & S_IFMT)
8143 case S_IFIFO: smode[0] = 'p'; break;
8144 case S_IFCHR: smode[0] = 'c'; break;
8145 case S_IFDIR: smode[0] = 'd'; break;
8146 case S_IFBLK: smode[0] = 'b'; break;
8147 case S_IFREG: smode[0] = '-'; break;
8148 default: smode[0] = '?'; break;
8151 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8152 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8153 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8155 for (int i = 0; i < 3; i++)
8157 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8162 yield = string_fmt_append(yield,
8163 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8164 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8165 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8166 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8167 (long)st.st_gid, st.st_size, (long)st.st_atime,
8168 (long)st.st_mtime, (long)st.st_ctime);
8172 /* vaguely random number less than N */
8176 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8178 if (expand_string_message)
8180 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8184 /* Reverse IP, including IPv6 to dotted-nibble */
8186 case EOP_REVERSE_IP:
8188 int family, maskptr;
8189 uschar reversed[128];
8191 family = string_is_ip_address(sub, &maskptr);
8194 expand_string_message = string_sprintf(
8195 "reverse_ip() not given an IP address [%s]", sub);
8198 invert_address(reversed, sub);
8199 yield = string_cat(yield, reversed);
8203 /* Unknown operator */
8206 expand_string_message =
8207 string_sprintf("unknown expansion operator \"%s\"", name);
8212 /* Handle a plain name. If this is the first thing in the expansion, release
8213 the pre-allocated buffer. If the result data is known to be in a new buffer,
8214 newsize will be set to the size of that buffer, and we can just point at that
8215 store instead of copying. Many expansion strings contain just one reference,
8216 so this is a useful optimization, especially for humungous headers
8217 ($message_headers). */
8226 g = store_get(sizeof(gstring), FALSE);
8227 else if (yield->ptr == 0)
8229 if (resetok) reset_point = store_reset(reset_point);
8231 reset_point = store_mark();
8232 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
8234 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
8236 expand_string_message =
8237 string_sprintf("unknown variable in \"${%s}\"", name);
8238 check_variable_error_message(name);
8241 len = Ustrlen(value);
8242 if (!yield && newsize)
8245 yield->size = newsize;
8250 yield = string_catn(yield, value, len);
8254 /* Else there's something wrong */
8256 expand_string_message =
8257 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8258 "in a variable reference)", name);
8262 /* If we hit the end of the string when ket_ends is set, there is a missing
8263 terminating brace. */
8265 if (ket_ends && *s == 0)
8267 expand_string_message = malformed_header
8268 ? US"missing } at end of string - could be header name not terminated by colon"
8269 : US"missing } at end of string";
8273 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8274 added to the string. If so, set up an empty string. Add a terminating zero. If
8275 left != NULL, return a pointer to the terminator. */
8278 yield = string_get(1);
8279 (void) string_from_gstring(yield);
8280 if (left) *left = s;
8282 /* Any stacking store that was used above the final string is no longer needed.
8283 In many cases the final string will be the first one that was got and so there
8284 will be optimal store usage. */
8286 if (resetok) gstring_release_unused(yield);
8287 else if (resetok_p) *resetok_p = FALSE;
8291 BOOL tainted = is_tainted(yield->s);
8294 debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string);
8295 debug_printf_indent("%sresult: %s\n",
8296 skipping ? "|-----" : "\\_____", yield->s);
8298 debug_printf_indent("%s \\__(tainted)\n",
8299 skipping ? "| " : " ");
8301 debug_printf_indent("\\___skipping: result is not used\n");
8305 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
8306 "expanding: %.*s\n",
8307 (int)(s - string), string);
8308 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8310 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8313 debug_printf_indent("%s(tainted)\n",
8315 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8317 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8318 "skipping: result is not used\n");
8324 /* This is the failure exit: easiest to program with a goto. We still need
8325 to update the pointer to the terminator, for cases of nested calls with "fail".
8328 EXPAND_FAILED_CURLY:
8329 if (malformed_header)
8330 expand_string_message =
8331 US"missing or misplaced { or } - could be header name not terminated by colon";
8333 else if (!expand_string_message || !*expand_string_message)
8334 expand_string_message = US"missing or misplaced { or }";
8336 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8337 that is a bad idea, because expand_string_message is in dynamic store. */
8340 if (left) *left = s;
8344 debug_printf_indent("|failed to expand: %s\n", string);
8345 debug_printf_indent("%serror message: %s\n",
8346 f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message);
8347 if (f.expand_string_forcedfail)
8348 debug_printf_indent("\\failure was forced\n");
8352 debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n",
8354 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8355 "error message: %s\n",
8356 f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8357 expand_string_message);
8358 if (f.expand_string_forcedfail)
8359 debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n");
8361 if (resetok_p && !resetok) *resetok_p = FALSE;
8367 /* This is the external function call. Do a quick check for any expansion
8368 metacharacters, and if there are none, just return the input string.
8370 Argument: the string to be expanded
8371 Returns: the expanded string, or NULL if expansion failed; if failure was
8372 due to a lookup deferring, search_find_defer will be TRUE
8376 expand_cstring(const uschar * string)
8378 if (Ustrpbrk(string, "$\\") != NULL)
8380 int old_pool = store_pool;
8383 f.search_find_defer = FALSE;
8384 malformed_header = FALSE;
8385 store_pool = POOL_MAIN;
8386 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
8387 store_pool = old_pool;
8395 expand_string(uschar * string)
8397 return US expand_cstring(CUS string);
8404 /*************************************************
8406 *************************************************/
8408 /* Now and again we want to expand a string and be sure that the result is in a
8409 new bit of store. This function does that.
8410 Since we know it has been copied, the de-const cast is safe.
8412 Argument: the string to be expanded
8413 Returns: the expanded string, always in a new bit of store, or NULL
8417 expand_string_copy(const uschar *string)
8419 const uschar *yield = expand_cstring(string);
8420 if (yield == string) yield = string_copy(string);
8426 /*************************************************
8427 * Expand and interpret as an integer *
8428 *************************************************/
8430 /* Expand a string, and convert the result into an integer.
8433 string the string to be expanded
8434 isplus TRUE if a non-negative number is expected
8436 Returns: the integer value, or
8437 -1 for an expansion error ) in both cases, message in
8438 -2 for an integer interpretation error ) expand_string_message
8439 expand_string_message is set NULL for an OK integer
8443 expand_string_integer(uschar *string, BOOL isplus)
8445 return expanded_string_integer(expand_string(string), isplus);
8449 /*************************************************
8450 * Interpret string as an integer *
8451 *************************************************/
8453 /* Convert a string (that has already been expanded) into an integer.
8455 This function is used inside the expansion code.
8458 s the string to be expanded
8459 isplus TRUE if a non-negative number is expected
8461 Returns: the integer value, or
8462 -1 if string is NULL (which implies an expansion error)
8463 -2 for an integer interpretation error
8464 expand_string_message is set NULL for an OK integer
8467 static int_eximarith_t
8468 expanded_string_integer(const uschar *s, BOOL isplus)
8470 int_eximarith_t value;
8471 uschar *msg = US"invalid integer \"%s\"";
8474 /* If expansion failed, expand_string_message will be set. */
8478 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8479 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8480 systems, so we set it zero ourselves. */
8483 expand_string_message = NULL; /* Indicates no error */
8485 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8486 equal to 0. Unfortunately, people actually relied upon that, so preserve
8487 the behaviour explicitly. Stripping leading whitespace is a harmless
8488 noop change since strtol skips it anyway (provided that there is a number
8491 if (Uskip_whitespace(&s) == '\0')
8494 debug_printf_indent("treating blank string as number 0\n");
8498 value = strtoll(CS s, CSS &endptr, 10);
8501 msg = US"integer expected but \"%s\" found";
8502 else if (value < 0 && isplus)
8503 msg = US"non-negative integer expected but \"%s\" found";
8506 switch (tolower(*endptr))
8511 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8516 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8517 else value *= 1024*1024;
8521 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8522 else value *= 1024*1024*1024;
8526 if (errno == ERANGE)
8527 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8529 if (Uskip_whitespace(&endptr) == 0) return value;
8532 expand_string_message = string_sprintf(CS msg, s);
8537 /* These values are usually fixed boolean values, but they are permitted to be
8541 addr address being routed
8542 mtype the module type
8543 mname the module name
8544 dbg_opt debug selectors
8545 oname the option name
8546 bvalue the router's boolean value
8547 svalue the router's string value
8548 rvalue where to put the returned value
8550 Returns: OK value placed in rvalue
8551 DEFER expansion failed
8555 exp_bool(address_item *addr,
8556 uschar *mtype, uschar *mname, unsigned dbg_opt,
8557 uschar *oname, BOOL bvalue,
8558 uschar *svalue, BOOL *rvalue)
8561 if (!svalue) { *rvalue = bvalue; return OK; }
8563 if (!(expanded = expand_string(svalue)))
8565 if (f.expand_string_forcedfail)
8567 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8571 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8572 oname, mname, mtype, expand_string_message);
8573 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8577 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8580 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8582 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8586 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8587 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8596 /* Avoid potentially exposing a password in a string about to be logged */
8599 expand_hide_passwords(uschar * s)
8601 return ( ( Ustrstr(s, "failed to expand") != NULL
8602 || Ustrstr(s, "expansion of ") != NULL
8604 && ( Ustrstr(s, "mysql") != NULL
8605 || Ustrstr(s, "pgsql") != NULL
8606 || Ustrstr(s, "redis") != NULL
8607 || Ustrstr(s, "sqlite") != NULL
8608 || Ustrstr(s, "ldap:") != NULL
8609 || Ustrstr(s, "ldaps:") != NULL
8610 || Ustrstr(s, "ldapi:") != NULL
8611 || Ustrstr(s, "ldapdn:") != NULL
8612 || Ustrstr(s, "ldapm:") != NULL
8614 ? US"Temporary internal error" : s;
8618 /* Read given named file into big_buffer. Use for keying material etc.
8619 The content will have an ascii NUL appended.
8624 Return: pointer to buffer, or NULL on error.
8628 expand_file_big_buffer(const uschar * filename)
8630 int fd, off = 0, len;
8632 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8634 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8641 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8644 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8652 big_buffer[off] = '\0';
8658 /*************************************************
8659 * Error-checking for testsuite *
8660 *************************************************/
8662 uschar * region_start;
8663 uschar * region_end;
8664 const uschar *var_name;
8665 const uschar *var_data;
8669 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8672 if (var_data >= e->region_start && var_data < e->region_end)
8674 e->var_name = CUS var_name;
8675 e->var_data = CUS var_data;
8680 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8682 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8683 .var_name = NULL, .var_data = NULL };
8685 /* check acl_ variables */
8686 tree_walk(acl_var_c, assert_variable_notin, &e);
8687 tree_walk(acl_var_m, assert_variable_notin, &e);
8689 /* check auth<n> variables */
8690 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8691 assert_variable_notin(US"auth<n>", auth_vars[i], &e);
8693 /* check regex<n> variables */
8694 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8695 assert_variable_notin(US"regex<n>", regex_vars[i], &e);
8697 /* check known-name variables */
8698 for (var_entry * v = var_table; v < var_table + var_table_size; v++)
8699 if (v->type == vtype_stringptr)
8700 assert_variable_notin(US v->name, *(USS v->value), &e);
8702 /* check dns and address trees */
8703 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8704 tree_walk(tree_duplicates, assert_variable_notin, &e);
8705 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8706 tree_walk(tree_unusable, assert_variable_notin, &e);
8709 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8710 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8711 e.var_name, filename, linenumber, e.var_data);
8716 /*************************************************
8717 **************************************************
8718 * Stand-alone test program *
8719 **************************************************
8720 *************************************************/
8726 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
8728 int ovector[3*(EXPAND_MAXN+1)];
8729 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8730 ovector, nelem(ovector));
8731 BOOL yield = n >= 0;
8732 if (n == 0) n = EXPAND_MAXN + 1;
8735 expand_nmax = setup < 0 ? 0 : setup + 1;
8736 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8738 expand_nstring[expand_nmax] = subject + ovector[nn];
8739 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
8747 int main(int argc, uschar **argv)
8749 uschar buffer[1024];
8751 debug_selector = D_v;
8752 debug_file = stderr;
8753 debug_fd = fileno(debug_file);
8754 big_buffer = malloc(big_buffer_size);
8756 for (int i = 1; i < argc; i++)
8758 if (argv[i][0] == '+')
8760 debug_trace_memory = 2;
8763 if (isdigit(argv[i][0]))
8764 debug_selector = Ustrtol(argv[i], NULL, 0);
8766 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8770 eldap_default_servers = argv[i];
8773 mysql_servers = argv[i];
8776 pgsql_servers = argv[i];
8779 redis_servers = argv[i];
8783 else opt_perl_startup = argv[i];
8787 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8789 expand_nstring[1] = US"string 1....";
8790 expand_nlength[1] = 8;
8794 if (opt_perl_startup != NULL)
8797 printf("Starting Perl interpreter\n");
8798 errstr = init_perl(opt_perl_startup);
8801 printf("** error in perl_startup code: %s\n", errstr);
8802 return EXIT_FAILURE;
8805 #endif /* EXIM_PERL */
8807 /* Thie deliberately regards the input as untainted, so that it can be
8808 expanded; only reasonable since this is a test for string-expansions. */
8810 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8812 rmark reset_point = store_mark();
8813 uschar *yield = expand_string(buffer);
8815 printf("%s\n", yield);
8818 if (f.search_find_defer) printf("search_find deferred\n");
8819 printf("Failed: %s\n", expand_string_message);
8820 if (f.expand_string_forcedfail) printf("Forced failure\n");
8823 store_reset(reset_point);
8835 /* End of expand.c */