1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 /* Functions for handling string expansion. */
17 # include "macro_predef.h"
20 typedef unsigned esi_flags;
22 #define ESI_BRACE_ENDS BIT(0) /* expansion should stop at } */
23 #define ESI_HONOR_DOLLAR BIT(1) /* $ is meaningfull */
24 #define ESI_SKIPPING BIT(2) /* value will not be needed */
25 #define ESI_EXISTS_ONLY BIT(3) /* actual value not needed */
28 # ifndef SUPPORT_CRYPTEQ
29 # define SUPPORT_CRYPTEQ
31 #endif /*!STAND_ALONE*/
33 #ifdef SUPPORT_CRYPTEQ
38 extern char* crypt16(char*, char*);
42 /* The handling of crypt16() is a mess. I will record below the analysis of the
43 mess that was sent to me. We decided, however, to make changing this very low
44 priority, because in practice people are moving away from the crypt()
45 algorithms nowadays, so it doesn't seem worth it.
48 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
49 the first 8 characters of the password using a 20-round version of crypt
50 (standard crypt does 25 rounds). It then crypts the next 8 characters,
51 or an empty block if the password is less than 9 characters, using a
52 20-round version of crypt and the same salt as was used for the first
53 block. Characters after the first 16 are ignored. It always generates
54 a 16-byte hash, which is expressed together with the salt as a string
55 of 24 base 64 digits. Here are some links to peruse:
57 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
58 http://seclists.org/bugtraq/1999/Mar/0076.html
60 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
61 and OSF/1. This is the same as the standard crypt if given a password
62 of 8 characters or less. If given more, it first does the same as crypt
63 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
64 using as salt the first two base 64 digits from the first hash block.
65 If the password is more than 16 characters then it crypts the 17th to 24th
66 characters using as salt the first two base 64 digits from the second hash
67 block. And so on: I've seen references to it cutting off the password at
68 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
70 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
71 http://seclists.org/bugtraq/1999/Mar/0109.html
72 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
73 TET1_html/sec.c222.html#no_id_208
75 Exim has something it calls "crypt16". It will either use a native
76 crypt16 or its own implementation. A native crypt16 will presumably
77 be the one that I called "crypt16" above. The internal "crypt16"
78 function, however, is a two-block-maximum implementation of what I called
79 "bigcrypt". The documentation matches the internal code.
81 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
82 that crypt16 and bigcrypt were different things.
84 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
85 to whatever it is using under that name. This unfortunately sets a
86 precedent for using "{crypt16}" to identify two incompatible algorithms
87 whose output can't be distinguished. With "{crypt16}" thus rendered
88 ambiguous, I suggest you deprecate it and invent two new identifiers
89 for the two algorithms.
91 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
92 of the password separately means they can be cracked separately, so
93 the double-length hash only doubles the cracking effort instead of
94 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
101 /*************************************************
102 * Local statics and tables *
103 *************************************************/
105 /* Table of item names, and corresponding switch numbers. The names must be in
106 alphabetical order. */
108 static uschar *item_table[] = {
178 /* Tables of operator names, and corresponding switch numbers. The names must be
179 in alphabetical order. There are two tables, because underscore is used in some
180 cases to introduce arguments, whereas for other it is part of the name. This is
181 an historical mis-design. */
183 static uschar * op_table_underscore[] = {
186 US"quote_local_part",
191 ,US"utf8_domain_from_alabel",
192 US"utf8_domain_to_alabel",
193 US"utf8_localpart_from_alabel",
194 US"utf8_localpart_to_alabel"
201 EOP_QUOTE_LOCAL_PART,
206 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
207 EOP_UTF8_DOMAIN_TO_ALABEL,
208 EOP_UTF8_LOCALPART_FROM_ALABEL,
209 EOP_UTF8_LOCALPART_TO_ALABEL
213 static uschar *op_table_main[] = {
264 EOP_ADDRESS = nelem(op_table_underscore),
314 /* Table of condition names, and corresponding switch numbers. The names must
315 be in alphabetical order. */
317 static uschar *cond_table[] = {
321 US"==", /* Backward compatibility */
361 US"match_local_part",
386 ECOND_FIRST_DELIVERY,
414 ECOND_MATCH_LOCAL_PART,
424 /* Type for entries pointing to address/length pairs. Not currently
432 typedef uschar * stringptr_fn_t(void);
433 static uschar * fn_recipients(void);
434 static uschar * fn_recipients_list(void);
435 static uschar * fn_queue_size(void);
437 /* This table must be kept in alphabetical order. */
439 static var_entry var_table[] = {
440 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
441 they will be confused with user-creatable ACL variables. */
442 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
443 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
444 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
445 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
446 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
447 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
448 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
449 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
450 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
451 { "acl_narg", vtype_int, &acl_narg },
452 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
453 { "address_data", vtype_stringptr, &deliver_address_data },
454 { "address_file", vtype_stringptr, &address_file },
455 { "address_pipe", vtype_stringptr, &address_pipe },
456 #ifdef EXPERIMENTAL_ARC
457 { "arc_domains", vtype_string_func, (void *) &fn_arc_domains },
458 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
459 { "arc_state", vtype_stringptr, &arc_state },
460 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
462 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
463 { "authenticated_id", vtype_stringptr, &authenticated_id },
464 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
465 { "authentication_failed",vtype_int, &authentication_failed },
466 #ifdef WITH_CONTENT_SCAN
467 { "av_failed", vtype_int, &av_failed },
469 #ifdef EXPERIMENTAL_BRIGHTMAIL
470 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
471 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
472 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
473 { "bmi_deliver", vtype_int, &bmi_deliver },
475 { "body_linecount", vtype_int, &body_linecount },
476 { "body_zerocount", vtype_int, &body_zerocount },
477 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
478 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
479 { "caller_gid", vtype_gid, &real_gid },
480 { "caller_uid", vtype_uid, &real_uid },
481 { "callout_address", vtype_stringptr, &callout_address },
482 { "compile_date", vtype_stringptr, &version_date },
483 { "compile_number", vtype_stringptr, &version_cnumber },
484 { "config_dir", vtype_stringptr, &config_main_directory },
485 { "config_file", vtype_stringptr, &config_main_filename },
486 { "connection_id", vtype_stringptr, &connection_id },
487 { "csa_status", vtype_stringptr, &csa_status },
488 #ifdef EXPERIMENTAL_DCC
489 { "dcc_header", vtype_stringptr, &dcc_header },
490 { "dcc_result", vtype_stringptr, &dcc_result },
493 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
494 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
495 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
496 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
497 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
498 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
499 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
500 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
501 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
502 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
503 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
504 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
505 { "dkim_key_length", vtype_int, &dkim_key_length },
506 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
507 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
508 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
509 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
510 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
511 { "dkim_signers", vtype_stringptr, &dkim_signers },
512 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
513 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
516 { "dmarc_domain_policy", vtype_module, US"dmarc" },
517 { "dmarc_status", vtype_module, US"dmarc" },
518 { "dmarc_status_text", vtype_module, US"dmarc" },
519 { "dmarc_used_domain", vtype_module, US"dmarc" },
521 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
522 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
523 { "dnslist_text", vtype_stringptr, &dnslist_text },
524 { "dnslist_value", vtype_stringptr, &dnslist_value },
525 { "domain", vtype_stringptr, &deliver_domain },
526 { "domain_data", vtype_stringptr, &deliver_domain_data },
527 #ifndef DISABLE_EVENT
528 { "event_data", vtype_stringptr, &event_data },
530 /*XXX want to use generic vars for as many of these as possible*/
531 { "event_defer_errno", vtype_int, &event_defer_errno },
533 { "event_name", vtype_stringptr, &event_name },
535 { "exim_gid", vtype_gid, &exim_gid },
536 { "exim_path", vtype_stringptr, &exim_path },
537 { "exim_uid", vtype_uid, &exim_uid },
538 { "exim_version", vtype_stringptr, &version_string },
539 { "headers_added", vtype_string_func, (void *) &fn_hdrs_added },
540 { "home", vtype_stringptr, &deliver_home },
541 { "host", vtype_stringptr, &deliver_host },
542 { "host_address", vtype_stringptr, &deliver_host_address },
543 { "host_data", vtype_stringptr, &host_data },
544 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
545 { "host_lookup_failed", vtype_int, &host_lookup_failed },
546 { "host_port", vtype_int, &deliver_host_port },
547 { "initial_cwd", vtype_stringptr, &initial_cwd },
548 { "inode", vtype_ino, &deliver_inode },
549 { "interface_address", vtype_stringptr, &interface_address },
550 { "interface_port", vtype_int, &interface_port },
551 { "item", vtype_stringptr, &iterate_item },
553 { "ldap_dn", vtype_stringptr, &eldap_dn },
555 { "load_average", vtype_load_avg, NULL },
556 { "local_part", vtype_stringptr, &deliver_localpart },
557 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
558 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
559 { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v },
560 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
561 { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v },
562 #ifdef HAVE_LOCAL_SCAN
563 { "local_scan_data", vtype_stringptr, &local_scan_data },
565 { "local_user_gid", vtype_gid, &local_user_gid },
566 { "local_user_uid", vtype_uid, &local_user_uid },
567 { "localhost_number", vtype_int, &host_number },
568 { "log_inodes", vtype_pinodes, (void *)FALSE },
569 { "log_space", vtype_pspace, (void *)FALSE },
570 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
571 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
572 #ifdef WITH_CONTENT_SCAN
573 { "malware_name", vtype_stringptr, &malware_name },
575 { "max_received_linelength", vtype_int, &max_received_linelength },
576 { "message_age", vtype_int, &message_age },
577 { "message_body", vtype_msgbody, &message_body },
578 { "message_body_end", vtype_msgbody_end, &message_body_end },
579 { "message_body_size", vtype_int, &message_body_size },
580 { "message_exim_id", vtype_stringptr, &message_id },
581 { "message_headers", vtype_msgheaders, NULL },
582 { "message_headers_raw", vtype_msgheaders_raw, NULL },
583 { "message_id", vtype_stringptr, &message_id },
584 { "message_linecount", vtype_int, &message_linecount },
585 { "message_size", vtype_int, &message_size },
587 { "message_smtputf8", vtype_bool, &message_smtputf8 },
589 #ifdef WITH_CONTENT_SCAN
590 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
591 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
592 { "mime_boundary", vtype_stringptr, &mime_boundary },
593 { "mime_charset", vtype_stringptr, &mime_charset },
594 { "mime_content_description", vtype_stringptr, &mime_content_description },
595 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
596 { "mime_content_id", vtype_stringptr, &mime_content_id },
597 { "mime_content_size", vtype_int, &mime_content_size },
598 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
599 { "mime_content_type", vtype_stringptr, &mime_content_type },
600 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
601 { "mime_filename", vtype_stringptr, &mime_filename },
602 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
603 { "mime_is_multipart", vtype_int, &mime_is_multipart },
604 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
605 { "mime_part_count", vtype_int, &mime_part_count },
607 { "n0", vtype_filter_int, &filter_n[0] },
608 { "n1", vtype_filter_int, &filter_n[1] },
609 { "n2", vtype_filter_int, &filter_n[2] },
610 { "n3", vtype_filter_int, &filter_n[3] },
611 { "n4", vtype_filter_int, &filter_n[4] },
612 { "n5", vtype_filter_int, &filter_n[5] },
613 { "n6", vtype_filter_int, &filter_n[6] },
614 { "n7", vtype_filter_int, &filter_n[7] },
615 { "n8", vtype_filter_int, &filter_n[8] },
616 { "n9", vtype_filter_int, &filter_n[9] },
617 { "original_domain", vtype_stringptr, &deliver_domain_orig },
618 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
619 { "originator_gid", vtype_gid, &originator_gid },
620 { "originator_uid", vtype_uid, &originator_uid },
621 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
622 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
623 { "pid", vtype_pid, NULL },
625 { "prdr_requested", vtype_bool, &prdr_requested },
627 { "primary_hostname", vtype_stringptr, &primary_hostname },
628 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
629 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
630 { "proxy_external_port", vtype_int, &proxy_external_port },
631 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
632 { "proxy_local_port", vtype_int, &proxy_local_port },
633 { "proxy_session", vtype_bool, &proxy_session },
635 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
636 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
637 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
638 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
639 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
640 { "queue_name", vtype_stringptr, &queue_name },
641 { "queue_size", vtype_string_func, (void *) &fn_queue_size },
642 { "rcpt_count", vtype_int, &rcpt_count },
643 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
644 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
645 { "received_count", vtype_int, &received_count },
646 { "received_for", vtype_stringptr, &received_for },
647 { "received_ip_address", vtype_stringptr, &interface_address },
648 { "received_port", vtype_int, &interface_port },
649 { "received_protocol", vtype_stringptr, &received_protocol },
650 { "received_time", vtype_int, &received_time.tv_sec },
651 { "recipient_data", vtype_stringptr, &recipient_data },
652 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
653 { "recipients", vtype_string_func, (void *) &fn_recipients },
654 { "recipients_count", vtype_int, &recipients_count },
655 { "recipients_list", vtype_string_func, (void *) &fn_recipients_list },
656 { "regex_cachesize", vtype_int, ®ex_cachesize },/* undocumented; devel observability */
657 #ifdef WITH_CONTENT_SCAN
658 { "regex_match_string", vtype_stringptr, ®ex_match_string },
660 { "reply_address", vtype_reply, NULL },
661 { "return_path", vtype_stringptr, &return_path },
662 { "return_size_limit", vtype_int, &bounce_return_size_limit },
663 { "router_name", vtype_stringptr, &router_name },
664 { "runrc", vtype_int, &runrc },
665 { "self_hostname", vtype_stringptr, &self_hostname },
666 { "sender_address", vtype_stringptr, &sender_address },
667 { "sender_address_data", vtype_stringptr, &sender_address_data },
668 { "sender_address_domain", vtype_domain, &sender_address },
669 { "sender_address_local_part", vtype_localpart, &sender_address },
670 { "sender_data", vtype_stringptr, &sender_data },
671 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
672 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
673 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
674 { "sender_helo_verified",vtype_string_func, (void *) &sender_helo_verified_boolstr },
675 { "sender_host_address", vtype_stringptr, &sender_host_address },
676 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
677 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
678 { "sender_host_name", vtype_host_lookup, NULL },
679 { "sender_host_port", vtype_int, &sender_host_port },
680 { "sender_ident", vtype_stringptr, &sender_ident },
681 { "sender_rate", vtype_stringptr, &sender_rate },
682 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
683 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
684 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
685 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
686 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
687 { "sending_port", vtype_int, &sending_port },
688 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
689 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
690 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
691 { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist },
692 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
693 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
694 { "sn0", vtype_filter_int, &filter_sn[0] },
695 { "sn1", vtype_filter_int, &filter_sn[1] },
696 { "sn2", vtype_filter_int, &filter_sn[2] },
697 { "sn3", vtype_filter_int, &filter_sn[3] },
698 { "sn4", vtype_filter_int, &filter_sn[4] },
699 { "sn5", vtype_filter_int, &filter_sn[5] },
700 { "sn6", vtype_filter_int, &filter_sn[6] },
701 { "sn7", vtype_filter_int, &filter_sn[7] },
702 { "sn8", vtype_filter_int, &filter_sn[8] },
703 { "sn9", vtype_filter_int, &filter_sn[9] },
704 #ifdef WITH_CONTENT_SCAN
705 { "spam_action", vtype_stringptr, &spam_action },
706 { "spam_bar", vtype_stringptr, &spam_bar },
707 { "spam_report", vtype_stringptr, &spam_report },
708 { "spam_score", vtype_stringptr, &spam_score },
709 { "spam_score_int", vtype_stringptr, &spam_score_int },
712 { "spf_guess", vtype_module, US"spf" },
713 { "spf_header_comment", vtype_module, US"spf" },
714 { "spf_received", vtype_module, US"spf" },
715 { "spf_result", vtype_module, US"spf" },
716 { "spf_result_guessed", vtype_module, US"spf" },
717 { "spf_smtp_comment", vtype_module, US"spf" },
719 { "spool_directory", vtype_stringptr, &spool_directory },
720 { "spool_inodes", vtype_pinodes, (void *)TRUE },
721 { "spool_space", vtype_pspace, (void *)TRUE },
723 { "srs_recipient", vtype_stringptr, &srs_recipient },
725 { "thisaddress", vtype_stringptr, &filter_thisaddress },
727 /* The non-(in,out) variables are now deprecated */
728 { "tls_bits", vtype_int, &tls_in.bits },
729 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
730 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
732 { "tls_in_bits", vtype_int, &tls_in.bits },
733 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
734 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
735 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
736 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
737 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
738 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
739 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
740 #ifndef DISABLE_TLS_RESUME
741 { "tls_in_resumption", vtype_int, &tls_in.resumption },
744 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
746 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
747 { "tls_out_bits", vtype_int, &tls_out.bits },
748 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
749 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
750 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
752 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
754 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
755 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
756 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
757 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
758 #ifndef DISABLE_TLS_RESUME
759 { "tls_out_resumption", vtype_int, &tls_out.resumption },
762 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
765 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
767 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
769 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
771 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
774 { "tod_bsdinbox", vtype_todbsdin, NULL },
775 { "tod_epoch", vtype_tode, NULL },
776 { "tod_epoch_l", vtype_todel, NULL },
777 { "tod_full", vtype_todf, NULL },
778 { "tod_log", vtype_todl, NULL },
779 { "tod_logfile", vtype_todlf, NULL },
780 { "tod_zone", vtype_todzone, NULL },
781 { "tod_zulu", vtype_todzulu, NULL },
782 { "transport_name", vtype_stringptr, &transport_name },
783 { "value", vtype_stringptr, &lookup_value },
784 { "verify_mode", vtype_stringptr, &verify_mode },
785 { "version_number", vtype_stringptr, &version_string },
786 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
787 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
788 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
789 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
790 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
791 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
797 uschar * fn_arc_domains(void) {return NULL;}
798 uschar * fn_hdrs_added(void) {return NULL;}
799 uschar * fn_queue_size(void) {return NULL;}
800 uschar * fn_recipients(void) {return NULL;}
801 uschar * fn_recipients_list(void) {return NULL;}
802 uschar * sender_helo_verified_boolstr(void) {return NULL;}
803 uschar * smtp_cmd_hist(void) {return NULL;}
808 expansion_items(void)
811 for (int i = 0; i < nelem(item_table); i++)
813 spf(buf, sizeof(buf), CUS"_EXP_ITEM_%T", item_table[i]);
814 builtin_macro_create(buf);
818 expansion_operators(void)
821 for (int i = 0; i < nelem(op_table_underscore); i++)
823 spf(buf, sizeof(buf), CUS"_EXP_OP_%T", op_table_underscore[i]);
824 builtin_macro_create(buf);
826 for (int i = 0; i < nelem(op_table_main); i++)
828 spf(buf, sizeof(buf), CUS"_EXP_OP_%T", op_table_main[i]);
829 builtin_macro_create(buf);
833 expansion_conditions(void)
836 for (int i = 0; i < nelem(cond_table); i++)
838 spf(buf, sizeof(buf), CUS"_EXP_COND_%T", cond_table[i]);
839 builtin_macro_create(buf);
843 expansion_variables(void)
846 for (int i = 0; i < nelem(var_table); i++)
848 spf(buf, sizeof(buf), CUS"_EXP_VAR_%T", var_table[i].name);
849 builtin_macro_create(buf);
857 expansion_operators();
858 expansion_conditions();
859 expansion_variables();
862 #else /*!MACRO_PREDEF*/
864 static uschar var_buffer[256];
865 static BOOL malformed_header;
867 /* For textual hashes */
869 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
870 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
873 enum { HMAC_MD5, HMAC_SHA1 };
875 /* For numeric hashes */
877 static unsigned int prime[] = {
878 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
879 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
880 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
882 /* For printing modes in symbolic form */
884 static uschar *mtable_normal[] =
885 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
887 static uschar *mtable_setid[] =
888 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
890 static uschar *mtable_sticky[] =
891 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
893 /* flags for find_header() */
894 #define FH_EXISTS_ONLY BIT(0)
895 #define FH_WANT_RAW BIT(1)
896 #define FH_WANT_LIST BIT(2)
898 /* Recursively called function */
899 static uschar *expand_string_internal(const uschar *, esi_flags, const uschar **, BOOL *, BOOL *);
900 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
903 /*************************************************
904 * Tables for UTF-8 support *
905 *************************************************/
907 /* Table of the number of extra characters, indexed by the first character
908 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
911 static uschar utf8_table1[] = {
912 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
913 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
914 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
915 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
917 /* These are the masks for the data bits in the first byte of a character,
918 indexed by the number of additional bytes. */
920 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
922 /* Get the next UTF-8 character, advancing the pointer. */
924 #define GETUTF8INC(c, ptr) \
926 if ((c & 0xc0) == 0xc0) \
928 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
930 c = (c & utf8_table2[a]) << s; \
934 c |= (*ptr++ & 0x3f) << s; \
940 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
942 /*************************************************
943 * Binary chop search on a table *
944 *************************************************/
946 /* This is used for matching expansion items and operators.
949 name the name that is being sought
950 table the table to search
951 table_size the number of items in the table
953 Returns: the offset in the table, or -1
957 chop_match(uschar *name, uschar **table, int table_size)
959 uschar **bot = table;
960 uschar **top = table + table_size;
964 uschar **mid = bot + (top - bot)/2;
965 int c = Ustrcmp(name, *mid);
966 if (c == 0) return mid - table;
967 if (c > 0) bot = mid + 1; else top = mid;
975 /*************************************************
976 * Check a condition string *
977 *************************************************/
979 /* This function is called to expand a string, and test the result for a "true"
980 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
981 forced fail or lookup defer.
983 We used to release all store used, but this is not not safe due
984 to ${dlfunc } and ${acl }. In any case expand_string_internal()
985 is reasonably careful to release what it can.
987 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
990 condition the condition string
991 m1 text to be incorporated in panic error
994 Returns: TRUE if condition is met, FALSE if not
998 expand_check_condition(const uschar * condition,
999 const uschar * m1, const uschar * m2)
1001 const uschar * ss = expand_cstring(condition);
1004 if (!f.expand_string_forcedfail && !f.search_find_defer)
1005 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
1006 "for %s %s: %s", condition, m1, m2, expand_string_message);
1009 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
1010 strcmpic(ss, US"false") != 0;
1016 /*************************************************
1017 * Pseudo-random number generation *
1018 *************************************************/
1020 /* Pseudo-random number generation. The result is not "expected" to be
1021 cryptographically strong but not so weak that someone will shoot themselves
1022 in the foot using it as a nonce in some email header scheme or whatever
1023 weirdness they'll twist this into. The result should ideally handle fork().
1025 However, if we're stuck unable to provide this, then we'll fall back to
1026 appallingly bad randomness.
1028 If DISABLE_TLS is not defined then this will not be used except as an emergency
1033 Returns a random number in range [0, max-1]
1037 # define vaguely_random_number vaguely_random_number_fallback
1040 vaguely_random_number(int max)
1043 # undef vaguely_random_number
1045 static pid_t pid = 0;
1048 if ((p2 = getpid()) != pid)
1053 #ifdef HAVE_ARC4RANDOM
1054 /* cryptographically strong randomness, common on *BSD platforms, not
1055 so much elsewhere. Alas. */
1056 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1059 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1060 # ifdef HAVE_SRANDOMDEV
1061 /* uses random(4) for seeding */
1066 gettimeofday(&tv, NULL);
1067 srandom(tv.tv_sec | tv.tv_usec | getpid());
1071 /* Poor randomness and no seeding here */
1078 #ifdef HAVE_ARC4RANDOM
1079 return arc4random() % max;
1080 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1081 return random() % max;
1083 /* This one returns a 16-bit number, definitely not crypto-strong */
1084 return random_number(max);
1091 /*************************************************
1092 * Pick out a name from a string *
1093 *************************************************/
1095 /* If the name is too long, it is silently truncated.
1098 name points to a buffer into which to put the name
1099 max is the length of the buffer
1100 s points to the first alphabetic character of the name
1101 extras chars other than alphanumerics to permit
1103 Returns: pointer to the first character after the name
1105 Note: The test for *s != 0 in the while loop is necessary because
1106 Ustrchr() yields non-NULL if the character is zero (which is not something
1109 static const uschar *
1110 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1113 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1115 if (ptr < max-1) name[ptr++] = *s;
1124 /*************************************************
1125 * Pick out the rest of a header name *
1126 *************************************************/
1128 /* A variable name starting $header_ (or just $h_ for those who like
1129 abbreviations) might not be the complete header name because headers can
1130 contain any printing characters in their names, except ':'. This function is
1131 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1132 on the end, if the name was terminated by white space.
1135 name points to a buffer in which the name read so far exists
1136 max is the length of the buffer
1137 s points to the first character after the name so far, i.e. the
1138 first non-alphameric character after $header_xxxxx
1140 Returns: a pointer to the first character after the header name
1143 static const uschar *
1144 read_header_name(uschar *name, int max, const uschar *s)
1146 int prelen = Ustrchr(name, '_') - name + 1;
1147 int ptr = Ustrlen(name) - prelen;
1148 if (ptr > 0) memmove(name, name+prelen, ptr);
1149 while (mac_isgraph(*s) && *s != ':')
1151 if (ptr < max-1) name[ptr++] = *s;
1162 /*************************************************
1163 * Pick out a number from a string *
1164 *************************************************/
1167 n points to an integer into which to put the number
1168 s points to the first digit of the number
1170 Returns: a pointer to the character after the last digit
1172 /*XXX consider expanding to int_eximarith_t. But the test for
1173 "overbig numbers" in 0002 still needs to overflow it. */
1176 read_number(int *n, uschar *s)
1179 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1183 static const uschar *
1184 read_cnumber(int *n, const uschar *s)
1187 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1193 /*************************************************
1194 * Extract keyed subfield from a string *
1195 *************************************************/
1197 /* The yield is in dynamic store; NULL means that the key was not found.
1200 key points to the name of the key
1201 s points to the string from which to extract the subfield
1203 Returns: NULL if the subfield was not found, or
1204 a pointer to the subfield's data
1208 expand_getkeyed(const uschar * key, const uschar * s)
1210 int length = Ustrlen(key);
1211 Uskip_whitespace(&s);
1213 /* Loop to search for the key */
1219 const uschar * dkey = s;
1221 while (*s && *s != '=' && !isspace(*s)) s++;
1222 dkeylength = s - dkey;
1223 if (Uskip_whitespace(&s) == '=')
1224 while (isspace(*++s)) ;
1226 data = string_dequote(&s);
1227 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1230 Uskip_whitespace(&s);
1239 find_var_ent(uschar * name, var_entry * table, unsigned nent)
1244 while (last > first)
1246 int middle = (first + last)/2;
1247 int c = Ustrcmp(name, table[middle].name);
1249 if (c > 0) { first = middle + 1; continue; }
1250 if (c < 0) { last = middle; continue; }
1251 return &table[middle];
1256 /*************************************************
1257 * Extract numbered subfield from string *
1258 *************************************************/
1260 /* Extracts a numbered field from a string that is divided by tokens - for
1261 example a line from /etc/passwd is divided by colon characters. First field is
1262 numbered one. Negative arguments count from the right. Zero returns the whole
1263 string. Returns NULL if there are insufficient tokens in the string
1266 Modifies final argument - this is a dynamically generated string, so that's OK.
1269 field number of field to be extracted,
1270 first field = 1, whole string = 0, last field = -1
1271 separators characters that are used to break string into tokens
1272 s points to the string from which to extract the subfield
1274 Returns: NULL if the field was not found,
1275 a pointer to the field's data inside s (modified to add 0)
1279 expand_gettokened (int field, uschar *separators, uschar *s)
1284 uschar *fieldtext = NULL;
1286 if (field == 0) return s;
1288 /* Break the line up into fields in place; for field > 0 we stop when we have
1289 done the number of fields we want. For field < 0 we continue till the end of
1290 the string, counting the number of fields. */
1292 count = (field > 0)? field : INT_MAX;
1298 /* Previous field was the last one in the string. For a positive field
1299 number, this means there are not enough fields. For a negative field number,
1300 check that there are enough, and scan back to find the one that is wanted. */
1304 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1305 if ((-field) == (INT_MAX - count - 1)) return s;
1309 while (ss[-1] != 0) ss--;
1315 /* Previous field was not last in the string; save its start and put a
1319 len = Ustrcspn(ss, separators);
1330 expand_getlistele(int field, const uschar * list)
1332 const uschar * tlist = list;
1334 /* Tainted mem for the throwaway element copies */
1335 uschar * dummy = store_get(2, GET_TAINTED);
1339 for (field++; string_nextinlist(&tlist, &sep, dummy, 1); ) field++;
1342 if (field == 0) return NULL;
1343 while (--field > 0 && (string_nextinlist(&list, &sep, dummy, 1))) ;
1344 return string_nextinlist(&list, &sep, NULL, 0);
1348 /* Certificate fields, by name. Worry about by-OID later */
1349 /* Names are chosen to not have common prefixes */
1356 uschar * (*getfn)(void * cert, uschar * mod);
1358 static certfield certfields[] =
1359 { /* linear search; no special order */
1360 { US"version", 7, &tls_cert_version },
1361 { US"serial_number", 13, &tls_cert_serial_number },
1362 { US"subject", 7, &tls_cert_subject },
1363 { US"notbefore", 9, &tls_cert_not_before },
1364 { US"notafter", 8, &tls_cert_not_after },
1365 { US"issuer", 6, &tls_cert_issuer },
1366 { US"signature", 9, &tls_cert_signature },
1367 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1368 { US"subj_altname", 12, &tls_cert_subject_altname },
1369 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1370 { US"crl_uri", 7, &tls_cert_crl_uri },
1374 expand_getcertele(uschar * field, uschar * certvar)
1378 if (!(vp = find_var_ent(certvar, var_table, nelem(var_table))))
1380 expand_string_message =
1381 string_sprintf("no variable named \"%s\"", certvar);
1382 return NULL; /* Unknown variable name */
1384 /* NB this stops us passing certs around in variable. Might
1385 want to do that in future */
1386 if (vp->type != vtype_cert)
1388 expand_string_message =
1389 string_sprintf("\"%s\" is not a certificate", certvar);
1390 return NULL; /* Unknown variable name */
1392 if (!*(void **)vp->value)
1395 if (*field >= '0' && *field <= '9')
1396 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1398 for (certfield * cp = certfields;
1399 cp < certfields + nelem(certfields);
1401 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1403 uschar * modifier = *(field += cp->namelen) == ','
1405 return (*cp->getfn)( *(void **)vp->value, modifier );
1408 expand_string_message =
1409 string_sprintf("bad field selector \"%s\" for certextract", field);
1412 #endif /*DISABLE_TLS*/
1414 /*************************************************
1415 * Extract a substring from a string *
1416 *************************************************/
1418 /* Perform the ${substr or ${length expansion operations.
1421 subject the input string
1422 value1 the offset from the start of the input string to the start of
1423 the output string; if negative, count from the right.
1424 value2 the length of the output string, or negative (-1) for unset
1425 if value1 is positive, unset means "all after"
1426 if value1 is negative, unset means "all before"
1427 len set to the length of the returned string
1429 Returns: pointer to the output string, or NULL if there is an error
1433 extract_substr(uschar *subject, int value1, int value2, int *len)
1435 int sublen = Ustrlen(subject);
1437 if (value1 < 0) /* count from right */
1441 /* If the position is before the start, skip to the start, and adjust the
1442 length. If the length ends up negative, the substring is null because nothing
1443 can precede. This falls out naturally when the length is unset, meaning "all
1449 if (value2 < 0) value2 = 0;
1453 /* Otherwise an unset length => characters before value1 */
1455 else if (value2 < 0)
1462 /* For a non-negative offset, if the starting position is past the end of the
1463 string, the result will be the null string. Otherwise, an unset length means
1464 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1468 if (value1 > sublen)
1473 else if (value2 < 0) value2 = sublen;
1476 /* Cut the length down to the maximum possible for the offset value, and get
1477 the required characters. */
1479 if (value1 + value2 > sublen) value2 = sublen - value1;
1481 return subject + value1;
1487 /*************************************************
1488 * Old-style hash of a string *
1489 *************************************************/
1491 /* Perform the ${hash expansion operation.
1494 subject the input string (an expanded substring)
1495 value1 the length of the output string; if greater or equal to the
1496 length of the input string, the input string is returned
1497 value2 the number of hash characters to use, or 26 if negative
1498 len set to the length of the returned string
1500 Returns: pointer to the output string, or NULL if there is an error
1504 compute_hash(uschar *subject, int value1, int value2, int *len)
1506 int sublen = Ustrlen(subject);
1508 if (value2 < 0) value2 = 26;
1509 else if (value2 > Ustrlen(hashcodes))
1511 expand_string_message =
1512 string_sprintf("hash count \"%d\" too big", value2);
1516 /* Calculate the hash text. We know it is shorter than the original string, so
1517 can safely place it in subject[] (we know that subject is always itself an
1518 expanded substring). */
1520 if (value1 < sublen)
1525 while ((c = (subject[j])) != 0)
1527 int shift = (c + j++) & 7;
1528 subject[i] ^= (c << shift) | (c >> (8-shift));
1529 if (++i >= value1) i = 0;
1531 for (i = 0; i < value1; i++)
1532 subject[i] = hashcodes[(subject[i]) % value2];
1534 else value1 = sublen;
1543 /*************************************************
1544 * Numeric hash of a string *
1545 *************************************************/
1547 /* Perform the ${nhash expansion operation. The first characters of the
1548 string are treated as most important, and get the highest prime numbers.
1551 subject the input string
1552 value1 the maximum value of the first part of the result
1553 value2 the maximum value of the second part of the result,
1554 or negative to produce only a one-part result
1555 len set to the length of the returned string
1557 Returns: pointer to the output string, or NULL if there is an error.
1561 compute_nhash (uschar *subject, int value1, int value2, int *len)
1563 uschar *s = subject;
1565 unsigned long int total = 0; /* no overflow */
1569 if (i == 0) i = nelem(prime) - 1;
1570 total += prime[i--] * (unsigned int)(*s++);
1573 /* If value2 is unset, just compute one number */
1576 s = string_sprintf("%lu", total % value1);
1578 /* Otherwise do a div/mod hash */
1582 total = total % (value1 * value2);
1583 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1594 /*************************************************
1595 * Find the value of a header or headers *
1596 *************************************************/
1598 /* Multiple instances of the same header get concatenated, and this function
1599 can also return a concatenation of all the header lines. When concatenating
1600 specific headers that contain lists of addresses, a comma is inserted between
1601 them. Otherwise we use a straight concatenation. Because some messages can have
1602 pathologically large number of lines, there is a limit on the length that is
1606 name the name of the header, without the leading $header_ or $h_,
1607 or NULL if a concatenation of all headers is required
1608 newsize return the size of memory block that was obtained; may be NULL
1609 if exists_only is TRUE
1610 flags FH_EXISTS_ONLY
1611 set if called from a def: test; don't need to build a string;
1612 just return a string that is not "" and not "0" if the header
1615 set if called for $rh_ or $rheader_ items; no processing,
1616 other than concatenating, will be done on the header. Also used
1617 for $message_headers_raw.
1619 Double colon chars in the content, and replace newline with
1620 colon between each element when concatenating; returning a
1621 colon-sep list (elements might contain newlines)
1622 charset name of charset to translate MIME words to; used only if
1623 want_raw is false; if NULL, no translation is done (this is
1624 used for $bh_ and $bheader_)
1626 Returns: NULL if the header does not exist, else a pointer to a new
1631 find_header(uschar * name, int * newsize, unsigned flags, const uschar * charset)
1634 int len = name ? Ustrlen(name) : 0;
1639 for (header_line * h = header_list; h; h = h->next)
1640 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1641 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1646 if (flags & FH_EXISTS_ONLY)
1647 return US"1"; /* don't need actual string */
1650 s = h->text + len; /* text to insert */
1651 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1652 Uskip_whitespace(&s); /* remove leading white space */
1653 t = h->text + h->slen; /* end-point */
1655 /* Unless wanted raw, remove trailing whitespace, including the
1658 if (flags & FH_WANT_LIST)
1659 while (t > s && t[-1] == '\n') t--;
1660 else if (!(flags & FH_WANT_RAW))
1662 while (t > s && isspace(t[-1])) t--;
1664 /* Set comma if handling a single header and it's one of those
1665 that contains an address list, except when asked for raw headers. Only
1666 need to do this once. */
1668 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1671 /* Trim the header roughly if we're approaching limits */
1673 if (gstring_length(g) + inc > header_insert_maxlen)
1674 inc = header_insert_maxlen - gstring_length(g);
1676 /* For raw just copy the data; for a list, add the data as a colon-sep
1677 list-element; for comma-list add as an unchecked comma,newline sep
1678 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1679 stripped trailing WS above including the newline). We ignore the potential
1680 expansion due to colon-doubling, just leaving the loop if the limit is met
1683 if (flags & FH_WANT_LIST)
1684 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1685 else if (flags & FH_WANT_RAW)
1686 g = string_catn(g, s, (unsigned)inc);
1688 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1691 if (gstring_length(g) >= header_insert_maxlen) break;
1694 if (!found) return NULL; /* No header found */
1695 if (!g) return US"";
1697 /* That's all we do for raw header expansion. */
1700 rawhdr = string_from_gstring(g);
1701 if (flags & FH_WANT_RAW)
1704 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1705 The rfc2047_decode2() function can return an error with decoded data if the
1706 charset translation fails. If decoding fails, it returns NULL. */
1710 uschar * error, * decoded = rfc2047_decode2(rawhdr,
1711 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1713 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1714 " input was: %s\n", error, rawhdr);
1715 return decoded ? decoded : rawhdr;
1722 /* Append a "local" element to an Authentication-Results: header
1723 if this was a non-smtp message.
1727 authres_local(gstring * g, const uschar * sysname)
1729 if (!f.authentication_local)
1731 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1732 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1737 /* Append an "iprev" element to an Authentication-Results: header
1738 if we have attempted to get the calling host's name.
1742 authres_iprev(gstring * g)
1744 if (sender_host_name)
1745 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1746 else if (host_lookup_deferred)
1747 g = string_cat(g, US";\n\tiprev=temperror");
1748 else if (host_lookup_failed)
1749 g = string_cat(g, US";\n\tiprev=fail");
1753 if (sender_host_address)
1754 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1760 /*************************************************
1761 * Return list of recipients *
1762 *************************************************/
1763 /* A recipients list is available only during system message filtering,
1764 during ACL processing after DATA, and while expanding pipe commands
1765 generated from a system filter, but not elsewhere. Note that this does
1766 not check for commas in the elements, and uses comma-space as seperator -
1767 so cannot be used as an exim list as-is. */
1774 if (!f.enable_dollar_recipients) return NULL;
1776 for (int i = 0; i < recipients_count; i++)
1778 const uschar * s = recipients_list[i].address;
1779 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1781 gstring_release_unused(g);
1782 return string_from_gstring(g);
1785 /* Similar, but as a properly-quoted exim list */
1789 fn_recipients_list(void)
1793 if (!f.enable_dollar_recipients) return NULL;
1795 for (int i = 0; i < recipients_count; i++)
1796 g = string_append_listele(g, ':', recipients_list[i].address);
1797 gstring_release_unused(g);
1798 return string_from_gstring(g);
1802 /*************************************************
1803 * Return size of queue *
1804 *************************************************/
1805 /* Ask the daemon for the queue size */
1810 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1814 const uschar * where;
1817 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1819 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1823 len = daemon_client_sockname(&sa_un, &sname);
1825 if (bind(fd, (const struct sockaddr *)&sa_un, (socklen_t)len) < 0)
1826 { where = US"bind"; goto bad; }
1829 debug_printf("local addr '%s%s'\n",
1830 *sa_un.sun_path ? "" : "@",
1831 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1834 len = daemon_notifier_sockname(&sa_un);
1835 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1836 { where = US"connect"; goto bad2; }
1838 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1839 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1841 if (poll_one_fd(fd, POLLIN, 2 * 1000) != 1)
1843 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1844 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1846 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1847 { where = US"recv"; goto bad2; }
1850 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1853 return string_copyn(buf, len);
1856 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1861 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1866 /*************************************************
1867 * Find value of a variable *
1868 *************************************************/
1870 /* The table of variables is kept in alphabetic order, so we can search it
1871 using a binary chop. The "choplen" variable is nothing to do with the binary
1875 name the name of the variable being sought
1877 exists_only TRUE if this is a def: test; passed on to find_header()
1878 skipping TRUE => skip any processing evaluation; this is not the same as
1879 exists_only because def: may test for values that are first
1881 newsize pointer to an int which is initially zero; if the answer is in
1882 a new memory buffer, *newsize is set to its size
1884 Returns: NULL if the variable does not exist, or
1885 a pointer to the variable's contents, or
1886 something non-NULL if exists_only is TRUE
1889 static const uschar *
1890 find_variable(uschar * name, esi_flags flags, int * newsize)
1893 uschar * s, * domain;
1896 var_entry * table = var_table;
1897 unsigned table_count = nelem(var_table);
1899 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1900 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1901 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1902 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1903 (this gave backwards compatibility at the changeover). There may be built-in
1904 variables whose names start acl_ but they should never start in this way. This
1905 slightly messy specification is a consequence of the history, needless to say.
1907 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1908 set, in which case give an error. */
1910 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1914 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1915 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1917 else if (Ustrncmp(name, "r_", 2) == 0)
1919 tree_node * node = tree_search(router_var, name + 2);
1920 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1923 /* Handle $auth<n>, $regex<n> variables. */
1925 if (Ustrncmp(name, "auth", 4) == 0)
1928 int n = Ustrtoul(name + 4, &endptr, 10);
1929 if (!*endptr && n != 0 && n <= AUTH_VARS)
1930 return auth_vars[n-1] ? auth_vars[n-1] : US"";
1932 #ifdef WITH_CONTENT_SCAN
1933 else if (Ustrncmp(name, "regex", 5) == 0)
1936 int n = Ustrtoul(name + 5, &endptr, 10);
1937 if (!*endptr && n != 0 && n <= REGEX_VARS)
1938 return regex_vars[n-1] ? regex_vars[n-1] : US"";
1944 /* For all other variables, search the table */
1946 if (!(vp = find_var_ent(name, table, table_count)))
1947 return NULL; /* Unknown variable name */
1949 /* Found an existing variable. If in skipping state, the value isn't needed,
1950 and we want to avoid processing (such as looking up the host name). */
1952 if (flags & ESI_SKIPPING)
1958 case vtype_filter_int:
1959 if (!f.filter_running) return NULL;
1963 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1967 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1971 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1975 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1979 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1982 case vtype_stringptr: /* Pointer to string */
1983 return (s = *((uschar **)(val))) ? s : US"";
1986 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1989 case vtype_load_avg:
1990 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1993 case vtype_host_lookup: /* Lookup if not done so */
1994 if ( !sender_host_name && sender_host_address
1995 && !host_lookup_failed && host_name_lookup() == OK)
1996 host_build_sender_fullhost();
1997 return sender_host_name ? sender_host_name : US"";
1999 case vtype_localpart: /* Get local part from address */
2000 if (!(s = *((uschar **)(val)))) return US"";
2001 if (!(domain = Ustrrchr(s, '@'))) return s;
2002 if (domain - s > sizeof(var_buffer) - 1)
2003 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
2004 " in string expansion", sizeof(var_buffer));
2005 return string_copyn(s, domain - s);
2007 case vtype_domain: /* Get domain from address */
2008 if (!(s = *((uschar **)(val)))) return US"";
2009 domain = Ustrrchr(s, '@');
2010 return domain ? domain + 1 : US"";
2012 case vtype_msgheaders:
2013 return find_header(NULL, newsize,
2014 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY : 0, NULL);
2016 case vtype_msgheaders_raw:
2017 return find_header(NULL, newsize,
2018 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2021 case vtype_msgbody: /* Pointer to msgbody string */
2022 case vtype_msgbody_end: /* Ditto, the end of the msg */
2023 ss = (uschar **)(val);
2024 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
2027 off_t start_offset_o = spool_data_start_offset(message_id);
2028 off_t start_offset = start_offset_o;
2029 int len = message_body_visible;
2031 if (len > message_size) len = message_size;
2032 *ss = body = store_get(len+1, GET_TAINTED);
2034 if (vp->type == vtype_msgbody_end)
2036 struct stat statbuf;
2037 if (fstat(deliver_datafile, &statbuf) == 0)
2039 start_offset = statbuf.st_size - len;
2040 if (start_offset < start_offset_o)
2041 start_offset = start_offset_o;
2044 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
2045 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
2047 if ((len = read(deliver_datafile, body, len)) > 0)
2050 if (message_body_newlines) /* Separate loops for efficiency */
2052 { if (body[--len] == 0) body[len] = ' '; }
2055 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
2058 return *ss ? *ss : US"";
2060 case vtype_todbsdin: /* BSD inbox time of day */
2061 return tod_stamp(tod_bsdin);
2063 case vtype_tode: /* Unix epoch time of day */
2064 return tod_stamp(tod_epoch);
2066 case vtype_todel: /* Unix epoch/usec time of day */
2067 return tod_stamp(tod_epoch_l);
2069 case vtype_todf: /* Full time of day */
2070 return tod_stamp(tod_full);
2072 case vtype_todl: /* Log format time of day */
2073 return tod_stamp(tod_log_bare); /* (without timezone) */
2075 case vtype_todzone: /* Time zone offset only */
2076 return tod_stamp(tod_zone);
2078 case vtype_todzulu: /* Zulu time */
2079 return tod_stamp(tod_zulu);
2081 case vtype_todlf: /* Log file datestamp tod */
2082 return tod_stamp(tod_log_datestamp_daily);
2084 case vtype_reply: /* Get reply address */
2085 s = find_header(US"reply-to:", newsize,
2086 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2088 if (s) Uskip_whitespace(&s);
2091 *newsize = 0; /* For the *s==0 case */
2092 s = find_header(US"from:", newsize,
2093 flags & ESI_EXISTS_ONLY ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2099 Uskip_whitespace(&s);
2100 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2101 while (t > s && isspace(t[-1])) t--;
2104 return s ? s : US"";
2106 case vtype_string_func:
2108 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2110 return s ? s : US"";
2116 sprintf(CS var_buffer, PR_EXIM_ARITH,
2117 receive_statvfs(val == (void *)TRUE, &inodes));
2124 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2125 sprintf(CS var_buffer, "%d", inodes);
2130 return *(void **)val ? US"<cert>" : US"";
2132 #ifndef DISABLE_DKIM
2134 return dkim_exim_expand_query((int)(long)val);
2140 misc_module_info * mi = misc_mod_find(val, &errstr);
2143 table = mi->variables;
2144 table_count = mi->variables_count;
2147 log_write(0, LOG_MAIN|LOG_PANIC,
2148 "failed to find %s module for %s: %s", US val, name, errstr);
2153 return NULL; /* Unknown variable. Silences static checkers. */
2160 modify_variable(uschar *name, void * value)
2163 if ((vp = find_var_ent(name, var_table, nelem(var_table))))
2165 return; /* Unknown variable name, fail silently */
2173 /*************************************************
2174 * Read and expand substrings *
2175 *************************************************/
2177 /* This function is called to read and expand argument substrings for various
2178 expansion items. Some have a minimum requirement that is less than the maximum;
2179 in these cases, the first non-present one is set to NULL.
2182 sub points to vector of pointers to set
2183 n maximum number of substrings
2185 sptr points to current string pointer
2187 skipping the skipping flag
2188 check_end if TRUE, check for final '}'
2189 name name of item, for error message
2190 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2192 textonly_p if not NULL, pointer to bitmask of which subs were text-only
2193 (did not change when expended)
2195 Returns: -1 OK; string pointer updated, but in "skipping" mode
2196 0 OK; string pointer updated
2197 1 curly bracketing error (too few arguments)
2198 2 too many arguments (only if check_end is set); message set
2199 3 other error (expansion failure)
2203 read_subs(uschar ** sub, int n, int m, const uschar ** sptr, esi_flags flags,
2204 BOOL check_end, uschar * name, BOOL * resetok, unsigned * textonly_p)
2206 const uschar * s = *sptr;
2207 unsigned textonly_l = 0;
2209 Uskip_whitespace(&s);
2210 for (int i = 0; i < n; i++)
2217 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2218 "(min is %d)", name, m);
2224 if (!(sub[i] = expand_string_internal(s+1,
2225 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags & ESI_SKIPPING, &s, resetok,
2226 textonly_p ? &textonly : NULL)))
2228 if (*s++ != '}') return 1;
2229 if (textonly_p && textonly) textonly_l |= BIT(i);
2230 Uskip_whitespace(&s);
2232 if (check_end && *s++ != '}')
2236 expand_string_message = string_sprintf("Too many arguments for '%s' "
2237 "(max is %d)", name, n);
2240 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2244 if (textonly_p) *textonly_p = textonly_l;
2246 return flags & ESI_SKIPPING ? -1 : 0;
2252 /*************************************************
2253 * Elaborate message for bad variable *
2254 *************************************************/
2256 /* For the "unknown variable" message, take a look at the variable's name, and
2257 give additional information about possible ACL variables. The extra information
2258 is added on to expand_string_message.
2260 Argument: the name of the variable
2265 check_variable_error_message(uschar *name)
2267 if (Ustrncmp(name, "acl_", 4) == 0)
2268 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2269 (name[4] == 'c' || name[4] == 'm')?
2271 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2272 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2274 US"user-defined ACL variables must start acl_c or acl_m");
2280 Load args from sub array to globals, and call acl_check().
2281 Sub array will be corrupted on return.
2283 Returns: OK access is granted by an ACCEPT verb
2284 DISCARD access is (apparently) granted by a DISCARD verb
2285 FAIL access is denied
2286 FAIL_DROP access is denied; drop the connection
2287 DEFER can't tell at the moment
2291 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2294 int sav_narg = acl_narg;
2296 uschar * dummy_logmsg;
2297 extern int acl_where;
2299 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2300 for (i = 0; i < nsub && sub[i+1]; i++)
2302 uschar * tmp = acl_arg[i];
2303 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2304 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2309 sub[i+1] = acl_arg[i];
2310 acl_arg[i++] = NULL;
2314 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2316 acl_narg>0 ? acl_arg[0] : US"<none>",
2317 acl_narg>1 ? " +more" : "");
2319 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2321 for (i = 0; i < nsub; i++)
2322 acl_arg[i] = sub[i+1]; /* restore old args */
2323 acl_narg = sav_narg;
2331 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2332 The given string is modified on return. Leading whitespace is skipped while
2333 looking for the opening wrap character, then the rest is scanned for the trailing
2334 (non-escaped) wrap character. A backslash in the string will act as an escape.
2336 A nul is written over the trailing wrap, and a pointer to the char after the
2337 leading wrap is returned.
2340 s String for de-wrapping
2341 wrap Two-char string, the first being the opener, second the closer wrapping
2344 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2348 dewrap(uschar * s, const uschar * wrap)
2352 BOOL quotesmode = wrap[0] == wrap[1];
2354 if (Uskip_whitespace(&p) == *wrap)
2360 if (*p == '\\') p++;
2361 else if (!quotesmode && *p == wrap[-1]) depth++;
2362 else if (*p == *wrap)
2373 expand_string_message = string_sprintf("missing '%c'", *wrap);
2378 /* Pull off the leading array or object element, returning
2379 a copy in an allocated string. Update the list pointer.
2381 The element may itself be an abject or array.
2382 Return NULL when the list is empty.
2386 json_nextinlist(const uschar ** list)
2388 unsigned array_depth = 0, object_depth = 0;
2389 BOOL quoted = FALSE;
2390 const uschar * s = *list, * item;
2392 skip_whitespace(&s);
2395 *s && (*s != ',' || array_depth != 0 || object_depth != 0 || quoted);
2397 if (!quoted) switch (*s)
2399 case '[': array_depth++; break;
2400 case ']': array_depth--; break;
2401 case '{': object_depth++; break;
2402 case '}': object_depth--; break;
2403 case '"': quoted = TRUE;
2407 case '\\': s++; break; /* backslash protects one char */
2408 case '"': quoted = FALSE; break;
2410 *list = *s ? s+1 : s;
2411 if (item == s) return NULL;
2412 item = string_copyn(item, s - item);
2413 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2419 /************************************************/
2420 /* Return offset in ops table, or -1 if not found.
2421 Repoint to just after the operator in the string.
2424 ss string representation of operator
2425 opname split-out operator name
2429 identify_operator(const uschar ** ss, uschar ** opname)
2431 const uschar * s = *ss;
2434 /* Numeric comparisons are symbolic */
2436 if (*s == '=' || *s == '>' || *s == '<')
2448 /* All other conditions are named */
2451 s = read_name(name, sizeof(name), s, US"_");
2454 /* If we haven't read a name, it means some non-alpha character is first. */
2458 expand_string_message = string_sprintf("condition name expected, "
2459 "but found \"%.16s\"", s);
2462 DEBUG(D_expand) debug_printf_indent("cond: %s\n", name);
2464 *opname = string_copy(name);
2466 return chop_match(name, cond_table, nelem(cond_table));
2470 /*************************************************
2471 * Handle MD5 or SHA-1 computation for HMAC *
2472 *************************************************/
2474 /* These are some wrapping functions that enable the HMAC code to be a bit
2475 cleaner. A good compiler will spot the tail recursion.
2478 type HMAC_MD5 or HMAC_SHA1
2479 remaining are as for the cryptographic hash functions
2485 chash_start(int type, void * base)
2487 if (type == HMAC_MD5)
2488 md5_start((md5 *)base);
2490 sha1_start((hctx *)base);
2494 chash_mid(int type, void * base, const uschar * string)
2496 if (type == HMAC_MD5)
2497 md5_mid((md5 *)base, string);
2499 sha1_mid((hctx *)base, string);
2503 chash_end(int type, void * base, const uschar * string, int length,
2506 if (type == HMAC_MD5)
2507 md5_end((md5 *)base, string, length, digest);
2509 sha1_end((hctx *)base, string, length, digest);
2516 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2517 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2520 key encoding key, nul-terminated
2521 src data to be hashed, nul-terminated
2523 len size of output buffer
2527 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2530 const uschar * keyptr;
2532 unsigned int keylen;
2534 #define MD5_HASHLEN 16
2535 #define MD5_HASHBLOCKLEN 64
2537 uschar keyhash[MD5_HASHLEN];
2538 uschar innerhash[MD5_HASHLEN];
2539 uschar finalhash[MD5_HASHLEN];
2540 uschar innerkey[MD5_HASHBLOCKLEN];
2541 uschar outerkey[MD5_HASHBLOCKLEN];
2544 keylen = Ustrlen(keyptr);
2546 /* If the key is longer than the hash block length, then hash the key
2549 if (keylen > MD5_HASHBLOCKLEN)
2551 chash_start(HMAC_MD5, &md5_base);
2552 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2554 keylen = MD5_HASHLEN;
2557 /* Now make the inner and outer key values */
2559 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2560 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2562 for (int i = 0; i < keylen; i++)
2564 innerkey[i] ^= keyptr[i];
2565 outerkey[i] ^= keyptr[i];
2568 /* Now do the hashes */
2570 chash_start(HMAC_MD5, &md5_base);
2571 chash_mid(HMAC_MD5, &md5_base, innerkey);
2572 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2574 chash_start(HMAC_MD5, &md5_base);
2575 chash_mid(HMAC_MD5, &md5_base, outerkey);
2576 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2578 /* Encode the final hash as a hex string, limited by output buffer size */
2581 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2583 if (j-- <= 0) break;
2584 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2585 if (j-- <= 0) break;
2586 *p++ = hex_digits[finalhash[i] & 0x0f];
2590 #endif /*SUPPORT_SRS*/
2593 /*************************************************
2594 * Read and evaluate a condition *
2595 *************************************************/
2599 s points to the start of the condition text
2600 resetok points to a BOOL which is written false if it is unsafe to
2601 free memory. Certain condition types (acl) may have side-effect
2602 allocation which must be preserved.
2603 yield points to a BOOL to hold the result of the condition test;
2604 if NULL, we are just reading through a condition that is
2605 part of an "or" combination to check syntax, or in a state
2606 where the answer isn't required
2608 Returns: a pointer to the first character after the condition, or
2612 static const uschar *
2613 eval_condition(const uschar * s, BOOL * resetok, BOOL * yield)
2615 BOOL testfor = TRUE, tempcond, combined_cond;
2617 BOOL sub2_honour_dollar = TRUE, is_forany, is_json, is_jsons;
2619 int_eximarith_t num[2];
2620 struct stat statbuf;
2623 const uschar * sub[10], * next;
2624 unsigned sub_textonly = 0;
2628 if (Uskip_whitespace(&s) == '!') { testfor = !testfor; s++; } else break;
2630 switch(cond_type = identify_operator(&s, &opname))
2632 /* def: tests for a non-empty variable, or for the existence of a header. If
2633 yield == NULL we are in a skipping state, and don't care about the answer. */
2641 expand_string_message = US"\":\" expected after \"def\"";
2645 s = read_name(name, sizeof(name), s+1, US"_");
2647 /* Test for a header's existence. If the name contains a closing brace
2648 character, this may be a user error where the terminating colon has been
2649 omitted. Set a flag to adjust a subsequent error message in this case. */
2651 if ( ( *(t = name) == 'h'
2652 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2654 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2657 s = read_header_name(name, sizeof(name), s);
2658 /* {-for-text-editors */
2659 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2661 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2664 /* Test for a variable's having a non-empty value. A non-existent variable
2665 causes an expansion failure. */
2669 if (!(t = find_variable(name,
2670 yield ? ESI_EXISTS_ONLY : ESI_EXISTS_ONLY | ESI_SKIPPING, NULL)))
2672 expand_string_message = name[0]
2673 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2674 : US"variable name omitted after \"def:\"";
2675 check_variable_error_message(name);
2678 if (yield) *yield = (t[0] != 0) == testfor;
2685 /* first_delivery tests for first delivery attempt */
2687 case ECOND_FIRST_DELIVERY:
2688 if (yield) *yield = f.deliver_firsttime == testfor;
2692 /* queue_running tests for any process started by a queue runner */
2694 case ECOND_QUEUE_RUNNING:
2695 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2699 /* exists: tests for file existence
2700 isip: tests for any IP address
2701 isip4: tests for an IPv4 address
2702 isip6: tests for an IPv6 address
2703 pam: does PAM authentication
2704 radius: does RADIUS authentication
2705 ldapauth: does LDAP authentication
2706 pwcheck: does Cyrus SASL pwcheck authentication
2715 case ECOND_LDAPAUTH:
2718 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2722 sub[0] = expand_string_internal(s+1,
2723 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yield ? ESI_NOFLAGS : ESI_SKIPPING),
2724 &s, resetok, &textonly);
2725 if (!sub[0]) goto failout;
2726 if (textonly) sub_textonly |= BIT(0);
2728 /* {-for-text-editors */
2729 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2731 if (!yield) { next = s; goto out; } /* No need to run the test if skipping */
2736 if ((expand_forbid & RDO_EXISTS) != 0)
2738 expand_string_message = US"File existence tests are not permitted";
2741 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2749 const uschar **errpp;
2750 DEBUG(D_expand) errpp = &errp; else errpp = 0;
2751 if (0 == (rc = string_is_ip_addressX(sub[0], NULL, errpp)))
2752 DEBUG(D_expand) debug_printf("failed: %s\n", errp);
2754 *yield = ( cond_type == ECOND_ISIP ? rc != 0 :
2755 cond_type == ECOND_ISIP4 ? rc == 4 : rc == 6) == testfor;
2760 /* Various authentication tests - all optionally compiled */
2764 rc = auth_call_pam(sub[0], &expand_string_message);
2767 goto COND_FAILED_NOT_COMPILED;
2768 #endif /* SUPPORT_PAM */
2771 #ifdef RADIUS_CONFIG_FILE
2772 rc = auth_call_radius(sub[0], &expand_string_message);
2775 goto COND_FAILED_NOT_COMPILED;
2776 #endif /* RADIUS_CONFIG_FILE */
2778 case ECOND_LDAPAUTH:
2781 int expand_setup = -1;
2782 const lookup_info * li = search_findtype(US"ldapauth", 8);
2785 if (li && (handle = search_open(NULL, li, 0, NULL, NULL)))
2786 rc = search_find(handle, NULL, sub[0],
2787 -1, NULL, 0, 0, &expand_setup, NULL)
2788 ? OK : f.search_find_defer ? DEFER : FAIL;
2790 { expand_string_message = search_error_message; rc = FAIL; }
2794 goto COND_FAILED_NOT_COMPILED;
2795 #endif /* LOOKUP_LDAP */
2798 #ifdef CYRUS_PWCHECK_SOCKET
2799 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2802 goto COND_FAILED_NOT_COMPILED;
2803 #endif /* CYRUS_PWCHECK_SOCKET */
2805 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2806 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2808 if (rc == ERROR || rc == DEFER) goto failout;
2809 *yield = (rc == OK) == testfor;
2815 /* call ACL (in a conditional context). Accept true, deny false.
2816 Defer is a forced-fail. Anything set by message= goes to $value.
2817 Up to ten parameters are used; we use the braces round the name+args
2818 like the saslauthd condition does, to permit a variable number of args.
2819 See also the expansion-item version EITEM_ACL and the traditional
2820 acl modifier ACLC_ACL.
2821 Since the ACL may allocate new global variables, tell our caller to not
2826 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2832 Uskip_whitespace(&s);
2833 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2835 switch(read_subs(sub, nelem(sub), 1, &s,
2836 yield ? ESI_NOFLAGS : ESI_SKIPPING, TRUE, name, resetok, NULL))
2838 case 1: expand_string_message = US"too few arguments or bracketing "
2841 case 3: goto failout;
2847 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2848 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2853 lookup_value = NULL;
2855 lookup_value = string_copy(user_msg);
2856 *yield = cond == testfor;
2860 f.expand_string_forcedfail = TRUE;
2863 expand_string_message = string_sprintf("%s from acl \"%s\"",
2864 rc_names[rc], sub[0]);
2872 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2874 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2876 However, the last two are optional. That is why the whole set is enclosed
2877 in their own set of braces. */
2879 case ECOND_SASLAUTHD:
2880 #ifndef CYRUS_SASLAUTHD_SOCKET
2881 goto COND_FAILED_NOT_COMPILED;
2885 Uskip_whitespace(&s);
2886 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2887 switch(read_subs(sub, nelem(sub), 2, &s,
2888 yield ? ESI_NOFLAGS : ESI_SKIPPING, TRUE, name, resetok, NULL))
2890 case 1: expand_string_message = US"too few arguments or bracketing "
2891 "error for saslauthd";
2893 case 3: goto failout;
2895 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2898 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2899 &expand_string_message);
2900 if (rc == ERROR || rc == DEFER) goto failout;
2901 *yield = (rc == OK) == testfor;
2905 #endif /* CYRUS_SASLAUTHD_SOCKET */
2908 /* symbolic operators for numeric and string comparison, and a number of
2909 other operators, all requiring two arguments.
2911 crypteq: encrypts plaintext and compares against an encrypted text,
2912 using crypt(), crypt16(), MD5 or SHA-1
2913 inlist/inlisti: checks if first argument is in the list of the second
2914 match: does a regular expression match and sets up the numerical
2915 variables if it succeeds
2916 match_address: matches in an address list
2917 match_domain: matches in a domain list
2918 match_ip: matches a host list that is restricted to IP addresses
2919 match_local_part: matches in a local part list
2922 case ECOND_MATCH_ADDRESS:
2923 case ECOND_MATCH_DOMAIN:
2924 case ECOND_MATCH_IP:
2925 case ECOND_MATCH_LOCAL_PART:
2926 #ifndef EXPAND_LISTMATCH_RHS
2927 sub2_honour_dollar = FALSE;
2936 case ECOND_NUM_L: /* Numerical comparisons */
2943 case ECOND_STR_LT: /* String comparisons */
2954 for (int i = 0; i < 2; i++)
2957 /* Sometimes, we don't expand substrings; too many insecure configurations
2958 created using match_address{}{} and friends, where the second param
2959 includes information from untrustworthy sources. */
2960 /*XXX is this moot given taint-tracking? */
2962 esi_flags flags = ESI_BRACE_ENDS;
2964 if (!(i > 0 && !sub2_honour_dollar)) flags |= ESI_HONOR_DOLLAR;
2965 if (!yield) flags |= ESI_SKIPPING;
2967 if (Uskip_whitespace(&s) != '{')
2969 if (i == 0) goto COND_FAILED_CURLY_START;
2970 expand_string_message = string_sprintf("missing 2nd string in {} "
2971 "after \"%s\"", opname);
2974 if (!(sub[i] = expand_string_internal(s+1, flags, &s, resetok, &textonly)))
2976 if (textonly) sub_textonly |= BIT(i);
2977 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2978 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2979 " for security reasons\n");
2980 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2982 /* Convert to numerical if required; we know that the names of all the
2983 conditions that compare numbers do not start with a letter. This just saves
2984 checking for them individually. */
2986 if (!isalpha(opname[0]) && yield)
2991 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2995 num[i] = expanded_string_integer(sub[i], FALSE);
2996 if (expand_string_message) goto failout;
3000 /* Result not required */
3002 if (!yield) { next = s; goto out; }
3004 /* Do an appropriate comparison */
3010 tempcond = (num[0] == num[1]); break;
3013 tempcond = (num[0] > num[1]); break;
3016 tempcond = (num[0] >= num[1]); break;
3019 tempcond = (num[0] < num[1]); break;
3022 tempcond = (num[0] <= num[1]); break;
3025 tempcond = (Ustrcmp(sub[0], sub[1]) < 0); break;
3028 tempcond = (strcmpic(sub[0], sub[1]) < 0); break;
3031 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); break;
3034 tempcond = (strcmpic(sub[0], sub[1]) <= 0); break;
3037 tempcond = (Ustrcmp(sub[0], sub[1]) == 0); break;
3040 tempcond = (strcmpic(sub[0], sub[1]) == 0); break;
3043 tempcond = (Ustrcmp(sub[0], sub[1]) > 0); break;
3046 tempcond = (strcmpic(sub[0], sub[1]) > 0); break;
3049 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); break;
3052 tempcond = (strcmpic(sub[0], sub[1]) >= 0); break;
3054 case ECOND_MATCH: /* Regular expression match */
3056 const pcre2_code * re = regex_compile(sub[1],
3057 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
3058 &expand_string_message, pcre_gen_cmp_ctx);
3062 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
3066 case ECOND_MATCH_ADDRESS: /* Match in an address list */
3067 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0,
3068 CUSS &lookup_value);
3069 goto MATCHED_SOMETHING;
3071 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
3072 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
3073 MCL_DOMAIN + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3074 goto MATCHED_SOMETHING;
3076 case ECOND_MATCH_IP: /* Match IP address in a host list */
3077 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
3079 expand_string_message = string_sprintf("\"%s\" is not an IP address",
3085 unsigned int *nullcache = NULL;
3086 check_host_block cb;
3088 cb.host_name = US"";
3089 cb.host_address = sub[0];
3091 /* If the host address starts off ::ffff: it is an IPv6 address in
3092 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3095 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
3096 cb.host_address + 7 : cb.host_address;
3098 rc = match_check_list(
3099 &sub[1], /* the list */
3100 0, /* separator character */
3101 &hostlist_anchor, /* anchor pointer */
3102 &nullcache, /* cache pointer */
3103 check_host, /* function for testing */
3104 &cb, /* argument for function */
3105 MCL_HOST, /* type of check */
3106 sub[0], /* text for debugging */
3107 CUSS &lookup_value); /* where to pass back data */
3109 goto MATCHED_SOMETHING;
3111 case ECOND_MATCH_LOCAL_PART:
3112 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3113 MCL_LOCALPART + MCL_NOEXPAND, TRUE, CUSS &lookup_value);
3119 case OK: tempcond = TRUE; break;
3120 case FAIL: tempcond = FALSE; break;
3123 expand_string_message = string_sprintf("unable to complete match "
3124 "against \"%s\": %s", sub[1], search_error_message);
3130 /* Various "encrypted" comparisons. If the second string starts with
3131 "{" then an encryption type is given. Default to crypt() or crypt16()
3132 (build-time choice). */
3133 /* }-for-text-editors */
3136 #ifndef SUPPORT_CRYPTEQ
3137 goto COND_FAILED_NOT_COMPILED;
3139 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3141 int sublen = Ustrlen(sub[1]+5);
3146 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3148 /* If the length that we are comparing against is 24, the MD5 digest
3149 is expressed as a base64 string. This is the way LDAP does it. However,
3150 some other software uses a straightforward hex representation. We assume
3151 this if the length is 32. Other lengths fail. */
3155 uschar *coded = b64encode(CUS digest, 16);
3156 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3157 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3158 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3160 else if (sublen == 32)
3163 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3165 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3166 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3167 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3171 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3172 "fail\n crypted=%s\n", sub[1]+5);
3177 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3179 int sublen = Ustrlen(sub[1]+6);
3184 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3186 /* If the length that we are comparing against is 28, assume the SHA1
3187 digest is expressed as a base64 string. If the length is 40, assume a
3188 straightforward hex representation. Other lengths fail. */
3192 uschar *coded = b64encode(CUS digest, 20);
3193 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3194 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3195 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3197 else if (sublen == 40)
3200 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3202 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3203 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3204 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3208 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3209 "fail\n crypted=%s\n", sub[1]+6);
3214 else /* {crypt} or {crypt16} and non-{ at start */
3215 /* }-for-text-editors */
3220 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3225 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3230 else if (sub[1][0] == '{') /* }-for-text-editors */
3232 expand_string_message = string_sprintf("unknown encryption mechanism "
3233 "in \"%s\"", sub[1]);
3239 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3240 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3241 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3245 #define XSTR(s) STR(s)
3246 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3247 " subject=%s\n crypted=%s\n",
3248 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3253 /* If the encrypted string contains fewer than two characters (for the
3254 salt), force failure. Otherwise we get false positives: with an empty
3255 string the yield of crypt() is an empty string! */
3258 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3259 else if (errno == EINVAL)
3263 expand_string_message = string_sprintf("crypt error: %s\n",
3264 US strerror(errno));
3269 #endif /* SUPPORT_CRYPTEQ */
3274 const uschar * list = sub[1];
3276 uschar *save_iterate_item = iterate_item;
3277 int (*compare)(const uschar *, const uschar *);
3279 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3282 compare = cond_type == ECOND_INLISTI
3283 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3285 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3287 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3288 if (compare(sub[0], iterate_item) == 0)
3291 lookup_value = iterate_item;
3295 iterate_item = save_iterate_item;
3298 } /* Switch for comparison conditions */
3300 *yield = tempcond == testfor;
3301 next = s; goto out; /* End of comparison conditions */
3304 /* and/or: computes logical and/or of several conditions */
3308 subcondptr = (yield == NULL) ? NULL : &tempcond;
3309 combined_cond = (cond_type == ECOND_AND);
3311 Uskip_whitespace(&s);
3312 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3316 /* {-for-text-editors */
3317 if (Uskip_whitespace(&s) == '}') break;
3318 if (*s != '{') /* }-for-text-editors */
3320 expand_string_message = string_sprintf("each subcondition "
3321 "inside an \"%s{...}\" condition must be in its own {}", opname);
3325 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3327 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3328 expand_string_message, opname);
3331 Uskip_whitespace(&s);
3333 /* {-for-text-editors */
3336 /* {-for-text-editors */
3337 expand_string_message = string_sprintf("missing } at end of condition "
3338 "inside \"%s\" group", opname);
3343 if (cond_type == ECOND_AND)
3345 combined_cond &= tempcond;
3346 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3347 } /* evaluate any more */
3350 combined_cond |= tempcond;
3351 if (combined_cond) subcondptr = NULL; /* once true, don't */
3352 } /* evaluate any more */
3355 if (yield) *yield = (combined_cond == testfor);
3356 next = ++s; goto out;
3359 /* forall/forany: iterates a condition with different values */
3361 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3362 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3363 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3364 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3365 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3366 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3370 const uschar * list;
3372 uschar *save_iterate_item = iterate_item;
3374 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3376 Uskip_whitespace(&s);
3377 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3378 if (!(sub[0] = expand_string_internal(s,
3379 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yield ? ESI_NOFLAGS : ESI_SKIPPING),
3380 &s, resetok, NULL)))
3382 /* {-for-text-editors */
3383 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3385 Uskip_whitespace(&s);
3386 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3390 /* Call eval_condition once, with result discarded (as if scanning a
3391 "false" part). This allows us to find the end of the condition, because if
3392 the list it empty, we won't actually evaluate the condition for real. */
3394 if (!(s = eval_condition(sub[1], resetok, NULL)))
3396 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3397 expand_string_message, opname);
3400 Uskip_whitespace(&s);
3402 /* {-for-text-editors */
3405 /* {-for-text-editors */
3406 expand_string_message = string_sprintf("missing } at end of condition "
3407 "inside \"%s\"", opname);
3411 if (yield) *yield = !testfor;
3413 if (is_json) list = dewrap(string_copy(list), US"[]");
3414 while ((iterate_item = is_json
3415 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3418 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3420 expand_string_message =
3421 string_sprintf("%s wrapping string result for extract jsons",
3422 expand_string_message);
3423 iterate_item = save_iterate_item;
3427 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3428 if (!eval_condition(sub[1], resetok, &tempcond))
3430 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3431 expand_string_message, opname);
3432 iterate_item = save_iterate_item;
3435 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3436 tempcond? "true":"false");
3438 if (yield) *yield = (tempcond == testfor);
3439 if (tempcond == is_forany) break;
3442 iterate_item = save_iterate_item;
3447 /* The bool{} expansion condition maps a string to boolean.
3448 The values supported should match those supported by the ACL condition
3449 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3450 of true/false. Note that Router "condition" rules have a different
3451 interpretation, where general data can be used and only a few values
3453 Note that readconf.c boolean matching, for boolean configuration options,
3454 only matches true/yes/false/no.
3455 The bool_lax{} condition matches the Router logic, which is much more
3458 case ECOND_BOOL_LAX:
3464 BOOL boolvalue = FALSE;
3466 if (Uskip_whitespace(&s) != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3467 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3468 switch(read_subs(sub_arg, 1, 1, &s,
3469 yield ? ESI_NOFLAGS : ESI_SKIPPING, FALSE, ourname, resetok, NULL))
3471 case 1: expand_string_message = string_sprintf(
3472 "too few arguments or bracketing error for %s",
3476 case 3: goto failout;
3479 Uskip_whitespace(&t);
3480 if ((len = Ustrlen(t)))
3482 /* trailing whitespace: seems like a good idea to ignore it too */
3484 while (isspace(*t2)) t2--;
3485 if (t2 != (t + len))
3492 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3493 /* logic for the lax case from expand_check_condition(), which also does
3494 expands, and the logic is both short and stable enough that there should
3495 be no maintenance burden from replicating it. */
3499 ? Ustrspn(t+1, "0123456789") == len-1
3500 : Ustrspn(t, "0123456789") == len)
3502 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3503 /* expand_check_condition only does a literal string "0" check */
3504 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3507 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3509 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3511 else if (cond_type == ECOND_BOOL_LAX)
3515 expand_string_message = string_sprintf("unrecognised boolean "
3519 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3520 boolvalue? "true":"false");
3521 if (yield) *yield = (boolvalue == testfor);
3526 case ECOND_INBOUND_SRS:
3527 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3530 const pcre2_code * re;
3531 pcre2_match_data * md;
3535 BOOL boolvalue = FALSE;
3537 switch(read_subs(sub, 2, 2, CUSS &s,
3538 yield ? ESI_NOFLAGS : ESI_SKIPPING, FALSE, name, resetok, NULL))
3540 case 1: expand_string_message = US"too few arguments or bracketing "
3541 "error for inbound_srs";
3543 case 3: goto failout;
3546 /* Match the given local_part against the SRS-encoded pattern */
3548 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]{2})=([^=]*)=(.*)$",
3549 MCS_CASELESS | MCS_CACHEABLE, FALSE);
3550 md = pcre2_match_data_create(4+1, pcre_gen_ctx);
3551 if (pcre2_match(re, sub[0], PCRE2_ZERO_TERMINATED, 0, PCRE_EOPT,
3552 md, pcre_gen_mtc_ctx) < 0)
3554 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3557 ovec = pcre2_get_ovector_pointer(md);
3559 if (sub[0][0] == '"')
3561 else for (uschar * s = sub[0]; *s; s++)
3562 if (!isalnum(*s) && Ustrchr(".!#$%&'*+-/=?^_`{|}~", *s) == NULL)
3563 { quoting = 1; break; }
3565 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
3567 /* Record the (quoted, if needed) decoded recipient as $srs_recipient */
3569 srs_recipient = string_sprintf("%.*s%.*S%.*s@%.*S", /* lowercased */
3571 (int) (ovec[9]-ovec[8]), sub[0] + ovec[8], /* substr 4 */
3573 (int) (ovec[7]-ovec[6]), sub[0] + ovec[6]); /* substr 3 */
3575 /* If a zero-length secret was given, we're done. Otherwise carry on
3576 and validate the given SRS local_part againt our secret. */
3580 /* check the timestamp */
3583 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3587 gettimeofday(&now, NULL);
3588 now.tv_sec /= 86400; /* days since epoch */
3590 /* Decode substring 2 from base32 to a number */
3592 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3594 uschar * t = Ustrchr(base32_chars, *ss++);
3595 d = d * 32 + (t - base32_chars);
3598 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3600 DEBUG(D_expand) debug_printf("SRS too old\n");
3605 /* check length of substring 1, the offered checksum */
3607 if (ovec[3]-ovec[2] != 4)
3609 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3613 /* Hash the address with our secret, and compare that computed checksum
3614 with the one extracted from the arg */
3616 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3617 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3619 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3626 /* pcre2_match_data_free(md); gen ctx needs no free */
3627 if (yield) *yield = (boolvalue == testfor);
3630 #endif /*SUPPORT_SRS*/
3632 /* Unknown condition */
3635 if (!expand_string_message || !*expand_string_message)
3636 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3638 } /* End switch on condition type */
3640 /* Missing braces at start and end of data */
3642 COND_FAILED_CURLY_START:
3643 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3646 COND_FAILED_CURLY_END:
3647 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3651 /* A condition requires code that is not compiled */
3653 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3654 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3655 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3656 COND_FAILED_NOT_COMPILED:
3657 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3672 /*************************************************
3673 * Save numerical variables *
3674 *************************************************/
3676 /* This function is called from items such as "if" that want to preserve and
3677 restore the numbered variables.
3680 save_expand_string points to an array of pointers to set
3681 save_expand_nlength points to an array of ints for the lengths
3683 Returns: the value of expand max to save
3687 save_expand_strings(const uschar **save_expand_nstring, int *save_expand_nlength)
3689 for (int i = 0; i <= expand_nmax; i++)
3691 save_expand_nstring[i] = expand_nstring[i];
3692 save_expand_nlength[i] = expand_nlength[i];
3699 /*************************************************
3700 * Restore numerical variables *
3701 *************************************************/
3703 /* This function restored saved values of numerical strings.
3706 save_expand_nmax the number of strings to restore
3707 save_expand_string points to an array of pointers
3708 save_expand_nlength points to an array of ints
3714 restore_expand_strings(int save_expand_nmax, const uschar **save_expand_nstring,
3715 int *save_expand_nlength)
3717 expand_nmax = save_expand_nmax;
3718 for (int i = 0; i <= expand_nmax; i++)
3720 expand_nstring[i] = save_expand_nstring[i];
3721 expand_nlength[i] = save_expand_nlength[i];
3729 /*************************************************
3730 * Handle yes/no substrings *
3731 *************************************************/
3733 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3734 alternative substrings that depend on whether or not the condition was true,
3735 or the lookup or extraction succeeded. The substrings always have to be
3736 expanded, to check their syntax, but "skipping" is set when the result is not
3737 needed - this avoids unnecessary nested lookups.
3741 skipping TRUE if we were skipping when this item was reached
3742 yes TRUE if the first string is to be used, else use the second
3743 save_lookup a value to put back into lookup_value before the 2nd expansion
3744 sptr points to the input string pointer
3745 yieldptr points to the output growable-string pointer
3746 type "lookup", "if", "extract", "run", "env", "listextract" or
3747 "certextract" for error message
3748 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3751 Returns: 0 OK; lookup_value has been reset to save_lookup
3753 2 expansion failed because of bracketing error
3757 process_yesno(esi_flags flags, BOOL yes, uschar *save_lookup, const uschar **sptr,
3758 gstring ** yieldptr, uschar *type, BOOL *resetok)
3761 const uschar *s = *sptr; /* Local value */
3762 uschar *sub1, *sub2;
3763 const uschar * errwhere;
3765 flags &= ESI_SKIPPING; /* Ignore all buf the skipping flag */
3767 /* If there are no following strings, we substitute the contents of $value for
3768 lookups and for extractions in the success case. For the ${if item, the string
3769 "true" is substituted. In the fail case, nothing is substituted for all three
3772 if (skip_whitespace(&s) == '}')
3776 if (yes && !(flags & ESI_SKIPPING))
3777 *yieldptr = string_catn(*yieldptr, US"true", 4);
3781 if (yes && lookup_value && !(flags & ESI_SKIPPING))
3782 *yieldptr = string_cat(*yieldptr, lookup_value);
3783 lookup_value = save_lookup;
3789 /* The first following string must be braced. */
3793 errwhere = US"'yes' part did not start with '{'"; /*}}*/
3797 /* Expand the first substring. Forced failures are noticed only if we actually
3798 want this string. Set skipping in the call in the fail case (this will always
3799 be the case if we were already skipping). */
3801 sub1 = expand_string_internal(s,
3802 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | (yes ? ESI_NOFLAGS : ESI_SKIPPING),
3804 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3805 f.expand_string_forcedfail = FALSE;
3809 errwhere = US"'yes' part did not end with '}'";
3813 /* If we want the first string, add it to the output */
3816 *yieldptr = string_cat(*yieldptr, sub1);
3818 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3819 $value to what it was at the start of the item, so that it has this value
3820 during the second string expansion. For the call from "if" or "run" to this
3821 function, save_lookup is set to lookup_value, so that this statement does
3824 lookup_value = save_lookup;
3826 /* There now follows either another substring, or "fail", or nothing. This
3827 time, forced failures are noticed only if we want the second string. We must
3828 set skipping in the nested call if we don't want this string, or if we were
3829 already skipping. */
3831 if (skip_whitespace(&s) == '{') /*}*/
3833 esi_flags s_flags = ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags;
3834 if (yes) s_flags |= ESI_SKIPPING;
3835 sub2 = expand_string_internal(s+1, s_flags, &s, resetok, NULL);
3836 if (!sub2 && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3837 f.expand_string_forcedfail = FALSE; /*{*/
3840 errwhere = US"'no' part did not start with '{'"; /*}*/
3844 /* If we want the second string, add it to the output */
3847 *yieldptr = string_cat(*yieldptr, sub2);
3850 /* If there is no second string, but the word "fail" is present when the use of
3851 the second string is wanted, set a flag indicating it was a forced failure
3852 rather than a syntactic error. Swallow the terminating } in case this is nested
3853 inside another lookup or if or extract. */
3858 /* deconst cast ok here as source is s anyway */
3859 s = US read_name(name, sizeof(name), s, US"_");
3860 if (Ustrcmp(name, "fail") == 0)
3862 if (!yes && !(flags & ESI_SKIPPING))
3864 Uskip_whitespace(&s); /*{{*/
3867 errwhere = US"did not close with '}' after forcedfail";
3870 expand_string_message =
3871 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3872 f.expand_string_forcedfail = TRUE;
3878 expand_string_message =
3879 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3884 /* All we have to do now is to check on the final closing brace. */
3886 skip_whitespace(&s); /*{{*/
3889 errwhere = US"did not close with '}'";
3895 /* Update the input pointer value before returning */
3900 /* Get here if there is a bracketing failure */
3901 expand_string_message = string_sprintf(
3902 "curly-bracket problem in conditional yes/no parsing: %s\n"
3903 " remaining string is '%s'", errwhere, --s);
3908 /* Get here for other failures */
3916 /********************************************************
3917 * prvs: Get last three digits of days since Jan 1, 1970 *
3918 ********************************************************/
3920 /* This is needed to implement the "prvs" BATV reverse
3923 Argument: integer "days" offset to add or substract to
3924 or from the current number of days.
3926 Returns: pointer to string containing the last three
3927 digits of the number of days since Jan 1, 1970,
3928 modified by the offset argument, NULL if there
3929 was an error in the conversion.
3934 prvs_daystamp(int day_offset)
3936 uschar * days = store_get(32, GET_UNTAINTED); /* Need at least 24 for cases */
3937 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3938 (time(NULL) + day_offset*86400)/86400);
3939 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3944 /********************************************************
3945 * prvs: perform HMAC-SHA1 computation of prvs bits *
3946 ********************************************************/
3948 /* This is needed to implement the "prvs" BATV reverse
3952 address RFC2821 Address to use
3953 key The key to use (must be less than 64 characters
3955 key_num Single-digit key number to use. Defaults to
3958 Returns: pointer to string containing the first three
3959 bytes of the final hash in hex format, NULL if
3960 there was an error in the process.
3964 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3966 gstring * hash_source;
3969 uschar innerhash[20];
3970 uschar finalhash[20];
3971 uschar innerkey[64];
3972 uschar outerkey[64];
3973 uschar *finalhash_hex;
3978 if (Ustrlen(key) > 64)
3981 hash_source = string_catn(NULL, key_num, 1);
3982 hash_source = string_catn(hash_source, daystamp, 3);
3983 hash_source = string_cat(hash_source, address);
3986 debug_printf_indent("prvs: hash source is '%Y'\n", hash_source);
3988 memset(innerkey, 0x36, 64);
3989 memset(outerkey, 0x5c, 64);
3991 for (int i = 0; i < Ustrlen(key); i++)
3993 innerkey[i] ^= key[i];
3994 outerkey[i] ^= key[i];
3997 chash_start(HMAC_SHA1, &h);
3998 chash_mid(HMAC_SHA1, &h, innerkey);
3999 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
4001 chash_start(HMAC_SHA1, &h);
4002 chash_mid(HMAC_SHA1, &h, outerkey);
4003 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
4005 /* Hashing is deemed sufficient to de-taint any input data */
4007 p = finalhash_hex = store_get(40, GET_UNTAINTED);
4008 for (int i = 0; i < 3; i++)
4010 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
4011 *p++ = hex_digits[finalhash[i] & 0x0f];
4015 return finalhash_hex;
4021 /*************************************************
4022 * Join a file onto the output string *
4023 *************************************************/
4025 /* This is used for readfile/readsock and after a run expansion.
4026 It joins the contents of a file onto the output string, globally replacing
4027 newlines with a given string (optionally).
4031 yield pointer to the expandable string struct
4032 eol newline replacement string, or NULL
4034 Returns: new pointer for expandable string, terminated if non-null
4038 cat_file(FILE * f, gstring * yield, uschar * eol)
4040 uschar buffer[1024];
4042 while (Ufgets(buffer, sizeof(buffer), f))
4044 int len = Ustrlen(buffer);
4045 if (eol && buffer[len-1] == '\n') len--;
4046 yield = string_catn(yield, buffer, len);
4047 if (eol && buffer[len])
4048 yield = string_cat(yield, eol);
4056 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
4059 uschar buffer[1024];
4061 /*XXX could we read direct into a pre-grown string? */
4063 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
4064 for (uschar * s = buffer; rc--; s++)
4065 yield = eol && *s == '\n'
4066 ? string_cat(yield, eol) : string_catn(yield, s, 1);
4068 /* We assume that all errors, and any returns of zero bytes,
4069 are actually EOF. */
4076 /*************************************************
4077 * Evaluate numeric expression *
4078 *************************************************/
4080 /* This is a set of mutually recursive functions that evaluate an arithmetic
4081 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
4082 these functions that is called from elsewhere is eval_expr, whose interface is:
4085 sptr pointer to the pointer to the string - gets updated
4086 decimal TRUE if numbers are to be assumed decimal
4087 error pointer to where to put an error message - must be NULL on input
4088 endket TRUE if ')' must terminate - FALSE for external call
4090 Returns: on success: the value of the expression, with *error still NULL
4091 on failure: an undefined value, with *error = a message
4094 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
4097 static int_eximarith_t
4098 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
4101 int_eximarith_t x = eval_op_or(&s, decimal, error);
4106 *error = US"expecting closing parenthesis";
4108 while (isspace(*++s)) ;
4110 *error = US"expecting operator";
4116 static int_eximarith_t
4117 eval_number(uschar **sptr, BOOL decimal, uschar **error)
4123 if (isdigit((c = Uskip_whitespace(&s))))
4126 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4128 switch (tolower(*s))
4131 case 'k': n *= 1024; s++; break;
4132 case 'm': n *= 1024*1024; s++; break;
4133 case 'g': n *= 1024*1024*1024; s++; break;
4135 Uskip_whitespace(&s);
4140 n = eval_expr(&s, decimal, error, 1);
4144 *error = US"expecting number or opening parenthesis";
4152 static int_eximarith_t
4153 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4157 Uskip_whitespace(&s);
4158 if (*s == '+' || *s == '-' || *s == '~')
4161 x = eval_op_unary(&s, decimal, error);
4162 if (op == '-') x = -x;
4163 else if (op == '~') x = ~x;
4166 x = eval_number(&s, decimal, error);
4173 static int_eximarith_t
4174 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4177 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4180 while (*s == '*' || *s == '/' || *s == '%')
4183 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4185 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4186 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4187 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4188 * -N*M is INT_MIN will yield INT_MIN.
4189 * Since we don't support floating point, this is somewhat simpler.
4190 * Ideally, we'd return an error, but since we overflow for all other
4191 * arithmetic, consistency suggests otherwise, but what's the correct value
4192 * to use? There is none.
4193 * The C standard guarantees overflow for unsigned arithmetic but signed
4194 * overflow invokes undefined behaviour; in practice, this is overflow
4195 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4196 * that long/longlong larger than int are available, or we could just work
4197 * with larger types. We should consider whether to guarantee 32bit eval
4198 * and 64-bit working variables, with errors returned. For now ...
4199 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4200 * can just let the other invalid results occur otherwise, as they have
4201 * until now. For this one case, we can coerce.
4203 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4206 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4207 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4217 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4233 static int_eximarith_t
4234 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4237 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4240 while (*s == '+' || *s == '-')
4243 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4245 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4246 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4247 { /* over-conservative check */
4249 ? US"overflow in sum" : US"overflow in difference";
4252 if (op == '+') x += y; else x -= y;
4260 static int_eximarith_t
4261 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4264 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4267 while ((*s == '<' || *s == '>') && s[1] == s[0])
4272 y = eval_op_sum(&s, decimal, error);
4274 if (op == '<') x <<= y; else x >>= y;
4282 static int_eximarith_t
4283 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4286 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4293 y = eval_op_shift(&s, decimal, error);
4303 static int_eximarith_t
4304 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4307 int_eximarith_t x = eval_op_and(&s, decimal, error);
4314 y = eval_op_and(&s, decimal, error);
4324 static int_eximarith_t
4325 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4328 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4335 y = eval_op_xor(&s, decimal, error);
4346 /************************************************/
4347 /* Comparison operation for sort expansion. We need to avoid
4348 re-expanding the fields being compared, so need a custom routine.
4351 cond_type Comparison operator code
4352 leftarg, rightarg Arguments for comparison
4354 Return true iff (leftarg compare rightarg)
4358 sortsbefore(int cond_type, BOOL alpha_cond,
4359 const uschar * leftarg, const uschar * rightarg)
4361 int_eximarith_t l_num, r_num;
4365 l_num = expanded_string_integer(leftarg, FALSE);
4366 if (expand_string_message) return FALSE;
4367 r_num = expanded_string_integer(rightarg, FALSE);
4368 if (expand_string_message) return FALSE;
4372 case ECOND_NUM_G: return l_num > r_num;
4373 case ECOND_NUM_GE: return l_num >= r_num;
4374 case ECOND_NUM_L: return l_num < r_num;
4375 case ECOND_NUM_LE: return l_num <= r_num;
4382 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4383 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4384 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4385 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4386 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4387 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4388 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4389 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4392 return FALSE; /* should not happen */
4396 /* Expand a named list. Return false on failure. */
4398 expand_listnamed(gstring * yield, const uschar * name, const uschar * listtype)
4400 tree_node *t = NULL;
4401 const uschar * list;
4404 BOOL needsep = FALSE;
4405 #define LISTNAMED_BUF_SIZE 256
4406 uschar b[LISTNAMED_BUF_SIZE];
4407 uschar * buffer = b;
4409 if (*name == '+') name++;
4410 if (!listtype) /* no-argument version */
4412 if ( !(t = tree_search(addresslist_anchor, name))
4413 && !(t = tree_search(domainlist_anchor, name))
4414 && !(t = tree_search(hostlist_anchor, name)))
4415 t = tree_search(localpartlist_anchor, name);
4417 else switch(*listtype) /* specific list-type version */
4419 case 'a': t = tree_search(addresslist_anchor, name); break;
4420 case 'd': t = tree_search(domainlist_anchor, name); break;
4421 case 'h': t = tree_search(hostlist_anchor, name); break;
4422 case 'l': t = tree_search(localpartlist_anchor, name); break;
4424 expand_string_message = US"bad suffix on \"list\" operator";
4430 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
4432 : *listtype=='a'?"address "
4433 : *listtype=='d'?"domain "
4434 : *listtype=='h'?"host "
4435 : *listtype=='l'?"localpart "
4440 list = ((namedlist_block *)(t->data.ptr))->string;
4442 /* The list could be quite long so we (re)use a buffer for each element
4443 rather than getting each in new memory */
4445 if (is_tainted(list)) buffer = store_get(LISTNAMED_BUF_SIZE, GET_TAINTED);
4446 while ((item = string_nextinlist(&list, &sep, buffer, LISTNAMED_BUF_SIZE)))
4448 uschar * buf = US" : ";
4450 yield = string_catn(yield, buf, 3);
4454 if (*item == '+') /* list item is itself a named list */
4456 yield = expand_listnamed(yield, item, listtype);
4457 if (expand_string_message)
4461 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
4464 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
4466 for(char * cp; cp = strpbrk(CCS item, tok); item = US cp)
4468 yield = string_catn(yield, item, cp - CS item);
4469 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
4470 yield = string_catn(yield, US"::", 2);
4471 else /* sep in item; should already be doubled; emit once */
4473 yield = string_catn(yield, US tok, 1);
4474 if (*cp == sep) cp++;
4477 yield = string_cat(yield, item);
4480 yield = string_cat(yield, item);
4487 /************************************************/
4489 debug_expansion_interim(const uschar * what, const uschar * value, int nchar,
4492 debug_printf_indent("%V", "K");
4494 for (int fill = 11 - Ustrlen(what); fill > 0; fill--)
4495 debug_printf("%V", "-");
4497 debug_printf("%s: %.*W\n", what, nchar, value);
4498 if (is_tainted(value))
4499 debug_printf_indent("%V %V(tainted)\n",
4500 flags & ESI_SKIPPING ? "|" : " ", "\\__");
4504 /*************************************************
4506 *************************************************/
4508 /* Returns either an unchanged string, or the expanded string in stacking pool
4509 store. Interpreted sequences are:
4511 \... normal escaping rules
4512 $name substitutes the variable
4514 ${op:string} operates on the expanded string value
4515 ${item{arg1}{arg2}...} expands the args and then does the business
4516 some literal args are not enclosed in {}
4518 There are now far too many operators and item types to make it worth listing
4519 them here in detail any more.
4521 We use an internal routine recursively to handle embedded substrings. The
4522 external function follows. The yield is NULL if the expansion failed, and there
4523 are two cases: if something collapsed syntactically, or if "fail" was given
4524 as the action on a lookup failure. These can be distinguished by looking at the
4525 variable expand_string_forcedfail, which is TRUE in the latter case.
4527 The skipping flag is set true when expanding a substring that isn't actually
4528 going to be used (after "if" or "lookup") and it prevents lookups from
4529 happening lower down.
4531 Store usage: At start, a store block of the length of the input plus 64
4532 is obtained. This is expanded as necessary by string_cat(), which might have to
4533 get a new block, or might be able to expand the original. At the end of the
4534 function we can release any store above that portion of the yield block that
4535 was actually used. In many cases this will be optimal.
4537 However: if the first item in the expansion is a variable name or header name,
4538 we reset the store before processing it; if the result is in fresh store, we
4539 use that without copying. This is helpful for expanding strings like
4540 $message_headers which can get very long.
4542 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4543 since resetting the store at the end of the expansion will free store that was
4544 allocated by the plugin code as well as the slop after the expanded string. So
4545 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4546 and, given the acl condition, ${if }. This is an unfortunate consequence of
4547 string expansion becoming too powerful.
4550 string the string to be expanded
4552 brace_ends expansion is to stop at }
4553 honour_dollar TRUE if $ is to be expanded,
4554 FALSE if it's just another character
4555 skipping TRUE for recursive calls when the value isn't actually going
4556 to be used (to allow for optimisation)
4557 left if not NULL, a pointer to the first character after the
4558 expansion is placed here (typically used with brace_ends)
4559 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4561 textonly_p if not NULL, pointer to flag - write bool for only-met-text
4563 Returns: NULL if expansion fails:
4564 expand_string_forcedfail is set TRUE if failure was forced
4565 expand_string_message contains a textual error message
4566 a pointer to the expanded string on success
4570 expand_string_internal(const uschar * string, esi_flags flags, const uschar ** left,
4571 BOOL *resetok_p, BOOL * textonly_p)
4573 rmark reset_point = store_mark();
4574 gstring * yield = string_get(Ustrlen(string) + 64);
4576 const uschar * s = string;
4577 const uschar * save_expand_nstring[EXPAND_MAXN+1];
4578 int save_expand_nlength[EXPAND_MAXN+1];
4579 BOOL resetok = TRUE, first = TRUE, textonly = TRUE;
4582 f.expand_string_forcedfail = FALSE;
4583 expand_string_message = US"";
4585 if (is_tainted(string))
4587 expand_string_message =
4588 string_sprintf("attempt to expand tainted string '%s'", s);
4589 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4599 debug_printf_indent("%V%V%s: %W\n",
4601 flags & ESI_SKIPPING ? "---" : "",
4602 flags & ESI_SKIPPING ? "scanning" : "considering", s);
4606 /* \ escapes the next character, which must exist, or else
4607 the expansion fails. There's a special escape, \N, which causes
4608 copying of the subject verbatim up to the next \N. Otherwise,
4609 the escapes are the standard set. */
4615 expand_string_message = US"\\ at end of string";
4621 const uschar * t = s + 2;
4622 for (s = t; *s ; s++) if (*s == '\\' && s[1] == 'N') break;
4625 debug_expansion_interim(US"protected", t, (int)(s - t), flags);
4626 if (!(flags & ESI_SKIPPING))
4627 yield = string_catn(yield, t, s - t);
4634 debug_printf_indent("%Vbackslashed: '\\%c'\n", "K", s[1]);
4635 ch[0] = string_interpret_escape(&s);
4636 if (!(flags & ESI_SKIPPING))
4637 yield = string_catn(yield, ch, 1);
4644 /* Anything other than $ is just copied verbatim, unless we are
4645 looking for a terminating } character. */
4647 if (flags & ESI_BRACE_ENDS && *s == '}') break;
4649 if (*s != '$' || !(flags & ESI_HONOR_DOLLAR))
4652 for (const uschar * t = s+1;
4653 *t && *t != '$' && *t != '}' && *t != '\\'; t++) i++;
4655 DEBUG(D_expand) debug_expansion_interim(US"text", s, i, flags);
4657 if (!(flags & ESI_SKIPPING))
4658 yield = string_catn(yield, s, i);
4664 /* No { after the $ - must be a plain name or a number for string
4665 match variable. There has to be a fudge for variables that are the
4666 names of header fields preceded by "$header_" because header field
4667 names can contain any printing characters except space and colon.
4668 For those that don't like typing this much, "$h_" is a synonym for
4669 "$header_". A non-existent header yields a NULL value; nothing is
4674 const uschar * value;
4675 int newsize = 0, len;
4679 s = read_name(name, sizeof(name), s, US"_");
4681 /* If this is the first thing to be expanded, release the pre-allocated
4684 if (!(flags & ESI_SKIPPING))
4686 g = store_get(sizeof(gstring), GET_UNTAINTED);
4687 else if (yield->ptr == 0)
4689 if (resetok) reset_point = store_reset(reset_point);
4691 reset_point = store_mark();
4692 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
4697 if ( ( *(t = name) == 'h'
4698 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4700 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4703 unsigned flags = *name == 'r' ? FH_WANT_RAW
4704 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4706 const uschar * charset = *name == 'b' ? NULL : headers_charset;
4708 s = read_header_name(name, sizeof(name), s);
4709 value = find_header(name, &newsize, flags, charset);
4711 /* If we didn't find the header, and the header contains a closing brace
4712 character, this may be a user error where the terminating colon
4713 has been omitted. Set a flag to adjust the error message in this case.
4714 But there is no error here - nothing gets inserted. */
4718 if (Ustrchr(name, '}')) malformed_header = TRUE;
4725 else if (!(value = find_variable(name, flags, &newsize)))
4727 expand_string_message =
4728 string_sprintf("unknown variable name \"%s\"", name);
4729 check_variable_error_message(name);
4733 /* If the data is known to be in a new buffer, newsize will be set to the
4734 size of that buffer. If this is the first thing in an expansion string,
4735 yield will be NULL; just point it at the new store instead of copying. Many
4736 expansion strings contain just one reference, so this is a useful
4737 optimization, especially for humungous headers. We need to use a gstring
4738 structure that is not allocated after that new-buffer, else a later store
4739 reset in the middle of the buffer will make it inaccessible. */
4741 len = Ustrlen(value);
4742 DEBUG(D_expand) debug_expansion_interim(US"value", value, len, flags);
4743 if (!(flags & ESI_SKIPPING))
4744 if (!yield && newsize != 0)
4747 yield->size = newsize;
4749 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
4752 yield = string_catn(yield, value, len);
4757 if (isdigit(*s)) /* A $<n> variable */
4760 s = read_cnumber(&n, s);
4761 if (n >= 0 && n <= expand_nmax)
4763 DEBUG(D_expand) debug_expansion_interim(US"value", expand_nstring[n], expand_nlength[n], flags);
4764 if (!(flags & ESI_SKIPPING))
4765 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4770 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4772 if (*s != '{') /*}*/
4774 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4778 /* After { there can be various things, but they all start with
4779 an initial word, except for a number for a string match variable. */ /*}*/
4784 s = read_cnumber(&n, s); /*{{*/
4787 expand_string_message = US"} expected after number";
4790 if (n >= 0 && n <= expand_nmax)
4792 DEBUG(D_expand) debug_expansion_interim(US"value", expand_nstring[n], expand_nlength[n], flags);
4793 if (!(flags & ESI_SKIPPING))
4794 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4801 expand_string_message = US"letter or digit expected after ${"; /*}*/
4805 /* Allow "-" in names to cater for substrings with negative
4806 arguments. Since we are checking for known names after { this is
4809 s = read_name(name, sizeof(name), s, US"_-");
4810 item_type = chop_match(name, item_table, nelem(item_table));
4812 /* Switch on item type. All nondefault choices should "continue* when
4813 skipping, but "break" otherwise so we get debug output for the item
4816 int expansion_start = gstring_length(yield);
4819 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4820 If the ACL returns accept or reject we return content set by "message ="
4821 There is currently no limit on recursion; this would have us call
4822 acl_check_internal() directly and get a current level from somewhere.
4823 See also the acl expansion condition ECOND_ACL and the traditional
4824 acl modifier ACLC_ACL.
4825 Assume that the function has side-effects on the store that must be preserved.
4829 /* ${acl {name} {arg1}{arg2}...} */
4831 uschar * sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4835 switch(read_subs(sub, nelem(sub), 1, &s, flags, TRUE, name, &resetok, NULL))
4837 case -1: continue; /* skipping */
4838 case 1: goto EXPAND_FAILED_CURLY;
4840 case 3: goto EXPAND_FAILED;
4844 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4849 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4851 yield = string_cat(yield, user_msg);
4855 f.expand_string_forcedfail = TRUE;
4858 expand_string_message = string_sprintf("%s from acl \"%s\"",
4859 rc_names[rc], sub[0]);
4865 case EITEM_AUTHRESULTS:
4866 /* ${authresults {mysystemname}} */
4868 uschar * sub_arg[1];
4870 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, flags, TRUE, name, &resetok, NULL))
4872 case -1: continue; /* If skipping, we don't actually do anything */
4873 case 1: goto EXPAND_FAILED_CURLY;
4875 case 3: goto EXPAND_FAILED;
4878 yield = string_append(yield, 3,
4879 US"Authentication-Results: ", sub_arg[0], US"; none");
4880 yield->ptr -= 6; /* ignore tha ": none" for now */
4882 yield = authres_local(yield, sub_arg[0]);
4883 yield = authres_iprev(yield);
4884 yield = authres_smtpauth(yield);
4887 misc_module_info * mi = misc_mod_findonly(US"spf");
4890 typedef gstring * (*fn_t)(gstring *);
4891 fn_t fn = ((fn_t *) mi->functions)[1]; /* authres_spf */
4896 #ifndef DISABLE_DKIM
4897 yield = authres_dkim(yield);
4899 #ifdef SUPPORT_DMARC
4901 misc_module_info * mi = misc_mod_findonly(US"dmarc");
4904 /*XXX is authres common enough to be generic? */
4905 typedef gstring * (*fn_t)(gstring *);
4906 fn_t fn = ((fn_t *) mi->functions)[2]; /* authres_dmarc*/
4911 #ifdef EXPERIMENTAL_ARC
4912 yield = authres_arc(yield);
4917 /* Handle conditionals - preserve the values of the numerical expansion
4918 variables in case they get changed by a regular expression match in the
4919 condition. If not, they retain their external settings. At the end
4920 of this "if" section, they get restored to their previous values. */
4925 const uschar *next_s;
4926 int save_expand_nmax =
4927 save_expand_strings(save_expand_nstring, save_expand_nlength);
4928 uschar * save_lookup_value = lookup_value;
4930 Uskip_whitespace(&s);
4931 if (!(next_s = eval_condition(s, &resetok, flags & ESI_SKIPPING ? NULL : &cond)))
4932 goto EXPAND_FAILED; /* message already set */
4936 debug_expansion_interim(US"condition", s, (int)(next_s - s), flags);
4937 debug_expansion_interim(US"result",
4938 cond ? US"true" : US"false", cond ? 4 : 5, flags);
4943 /* The handling of "yes" and "no" result strings is now in a separate
4944 function that is also used by ${lookup} and ${extract} and ${run}. */
4946 switch(process_yesno(
4947 flags, /* were previously skipping */
4948 cond, /* success/failure indicator */
4949 lookup_value, /* value to reset for string2 */
4950 &s, /* input pointer */
4951 &yield, /* output pointer */
4952 US"if", /* condition type */
4955 case 1: goto EXPAND_FAILED; /* when all is well, the */
4956 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4959 /* Restore external setting of expansion variables for continuation
4962 lookup_value = save_lookup_value;
4963 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4964 save_expand_nlength);
4969 case EITEM_IMAPFOLDER:
4970 { /* ${imapfolder {name}{sep}{specials}} */
4974 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, flags, TRUE, name, &resetok, NULL))
4976 case 1: goto EXPAND_FAILED_CURLY;
4978 case 3: goto EXPAND_FAILED;
4981 if (!sub_arg[1]) /* One argument */
4983 sub_arg[1] = US"/"; /* default separator */
4986 else if (Ustrlen(sub_arg[1]) != 1)
4988 expand_string_message =
4990 "IMAP folder separator must be one character, found \"%s\"",
4995 if (flags & ESI_SKIPPING) continue;
4997 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4998 sub_arg[1][0], sub_arg[2], &expand_string_message)))
5000 yield = string_cat(yield, encoded);
5005 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
5006 expanding an internal string that isn't actually going to be used. All we
5007 need to do is check the syntax, so don't do a lookup at all. Preserve the
5008 values of the numerical expansion variables in case they get changed by a
5009 partial lookup. If not, they retain their external settings. At the end
5010 of this "lookup" section, they get restored to their previous values. */
5014 int expand_setup = 0, nameptr = 0;
5015 int partial, affixlen, starflags;
5016 const lookup_info * li;
5017 uschar * key, * filename;
5018 const uschar * affix, * opts;
5019 uschar * save_lookup_value = lookup_value;
5020 int save_expand_nmax =
5021 save_expand_strings(save_expand_nstring, save_expand_nlength);
5023 if (expand_forbid & RDO_LOOKUP)
5025 expand_string_message = US"lookup expansions are not permitted";
5029 /* Get the key we are to look up for single-key+file style lookups.
5030 Otherwise set the key NULL pro-tem. */
5032 if (Uskip_whitespace(&s) == '{') /*}*/
5034 key = expand_string_internal(s+1,
5035 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
5036 if (!key) goto EXPAND_FAILED; /*{{*/
5039 expand_string_message = US"missing '}' after lookup key";
5040 goto EXPAND_FAILED_CURLY;
5042 Uskip_whitespace(&s);
5046 /* Find out the type of database */
5050 expand_string_message = US"missing lookup type";
5054 /* The type is a string that may contain special characters of various
5055 kinds. Allow everything except space or { to appear; the actual content
5056 is checked by search_findtype_partial. */ /*}*/
5058 while (*s && *s != '{' && !isspace(*s)) /*}*/
5060 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
5063 name[nameptr] = '\0';
5064 Uskip_whitespace(&s);
5066 /* Now check for the individual search type and any partial or default
5067 options. Only those types that are actually in the binary are valid. */
5069 if (!(li = search_findtype_partial(name, &partial, &affix, &affixlen,
5070 &starflags, &opts)))
5072 expand_string_message = search_error_message;
5076 /* Check that a key was provided for those lookup types that need it,
5077 and was not supplied for those that use the query style. */
5079 if (!mac_islookup(li, lookup_querystyle|lookup_absfilequery))
5083 expand_string_message = string_sprintf("missing {key} for single-"
5084 "key \"%s\" lookup", name);
5090 expand_string_message = string_sprintf("a single key was given for "
5091 "lookup type \"%s\", which is not a single-key lookup type", name);
5095 /* Get the next string in brackets and expand it. It is the file name for
5096 single-key+file lookups, and the whole query otherwise. In the case of
5097 queries that also require a file name (e.g. sqlite), the file name comes
5102 expand_string_message = US"missing '{' for lookup file-or-query arg";
5103 goto EXPAND_FAILED_CURLY; /*}}*/
5105 if (!(filename = expand_string_internal(s+1,
5106 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
5111 expand_string_message = US"missing '}' closing lookup file-or-query arg";
5112 goto EXPAND_FAILED_CURLY;
5114 Uskip_whitespace(&s);
5116 /* If this isn't a single-key+file lookup, re-arrange the variables
5117 to be appropriate for the search_ functions. For query-style lookups,
5118 there is just a "key", and no file name. For the special query-style +
5119 file types, the query (i.e. "key") starts with a file name. */
5122 key = search_args(li, name, filename, &filename, opts);
5124 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
5125 the entry was not found. Note that there is no search_close() function.
5126 Files are left open in case of re-use. At suitable places in higher logic,
5127 search_tidyup() is called to tidy all open files. This can save opening
5128 the same file several times. However, files may also get closed when
5129 others are opened, if too many are open at once. The rule is that a
5130 handle should not be used after a second search_open().
5132 Request that a partial search sets up $1 and maybe $2 by passing
5133 expand_setup containing zero. If its value changes, reset expand_nmax,
5134 since new variables will have been set. Note that at the end of this
5135 "lookup" section, the old numeric variables are restored. */
5137 if (flags & ESI_SKIPPING)
5138 lookup_value = NULL;
5141 void * handle = search_open(filename, li, 0, NULL, NULL);
5144 expand_string_message = search_error_message;
5147 lookup_value = search_find(handle, filename, key, partial, affix,
5148 affixlen, starflags, &expand_setup, opts);
5149 if (f.search_find_defer)
5151 expand_string_message =
5152 string_sprintf("lookup of \"%s\" gave DEFER: %s",
5153 string_printing2(key, SP_TAB), search_error_message);
5156 if (expand_setup > 0) expand_nmax = expand_setup;
5159 /* The handling of "yes" and "no" result strings is now in a separate
5160 function that is also used by ${if} and ${extract}. */
5162 switch(process_yesno(
5163 flags, /* were previously skipping */
5164 lookup_value != NULL, /* success/failure indicator */
5165 save_lookup_value, /* value to reset for string2 */
5166 &s, /* input pointer */
5167 &yield, /* output pointer */
5168 US"lookup", /* condition type */
5171 case 1: goto EXPAND_FAILED; /* when all is well, the */
5172 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5175 /* Restore external setting of expansion variables for carrying on
5176 at this level, and continue. */
5178 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5179 save_expand_nlength);
5181 if (flags & ESI_SKIPPING) continue;
5185 /* If Perl support is configured, handle calling embedded perl subroutines,
5186 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
5187 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
5188 arguments (defined below). */
5190 #define EXIM_PERL_MAX_ARGS 8
5194 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
5195 "is not included in this binary";
5198 #else /* EXIM_PERL */
5200 uschar * sub_arg[EXIM_PERL_MAX_ARGS + 2];
5201 gstring * new_yield;
5203 if (expand_forbid & RDO_PERL)
5205 expand_string_message = US"Perl calls are not permitted";
5209 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, flags, TRUE,
5210 name, &resetok, NULL))
5212 case -1: continue; /* If skipping, we don't actually do anything */
5213 case 1: goto EXPAND_FAILED_CURLY;
5215 case 3: goto EXPAND_FAILED;
5218 /* Start the interpreter if necessary */
5220 if (!opt_perl_started)
5223 if (!opt_perl_startup)
5225 expand_string_message = US"A setting of perl_startup is needed when "
5226 "using the Perl interpreter";
5229 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
5230 if ((initerror = init_perl(opt_perl_startup)))
5232 expand_string_message =
5233 string_sprintf("error in perl_startup code: %s\n", initerror);
5236 opt_perl_started = TRUE;
5239 /* Call the function */
5241 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5242 new_yield = call_perl_cat(yield, &expand_string_message,
5243 sub_arg[0], sub_arg + 1);
5245 /* NULL yield indicates failure; if the message pointer has been set to
5246 NULL, the yield was undef, indicating a forced failure. Otherwise the
5247 message will indicate some kind of Perl error. */
5251 if (!expand_string_message)
5253 expand_string_message =
5254 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5255 "failure", sub_arg[0]);
5256 f.expand_string_forcedfail = TRUE;
5261 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5262 set during a callback from Perl. */
5264 f.expand_string_forcedfail = FALSE;
5268 #endif /* EXIM_PERL */
5270 /* Transform email address to "prvs" scheme to use
5271 as BATV-signed return path */
5275 uschar * sub_arg[3], * p, * domain;
5277 switch(read_subs(sub_arg, 3, 2, &s, flags, TRUE, name, &resetok, NULL))
5279 case -1: continue; /* If skipping, we don't actually do anything */
5280 case 1: goto EXPAND_FAILED_CURLY;
5282 case 3: goto EXPAND_FAILED;
5285 /* sub_arg[0] is the address */
5286 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5287 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5289 expand_string_message = US"prvs first argument must be a qualified email address";
5293 /* Calculate the hash. The third argument must be a single-digit
5294 key number, or unset. */
5297 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5299 expand_string_message = US"prvs third argument must be a single digit";
5303 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5306 expand_string_message = US"prvs hmac-sha1 conversion failed";
5310 /* Now separate the domain from the local part */
5313 yield = string_catn(yield, US"prvs=", 5);
5314 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5315 yield = string_catn(yield, prvs_daystamp(7), 3);
5316 yield = string_catn(yield, p, 6);
5317 yield = string_catn(yield, US"=", 1);
5318 yield = string_cat (yield, sub_arg[0]);
5319 yield = string_catn(yield, US"@", 1);
5320 yield = string_cat (yield, domain);
5325 /* Check a prvs-encoded address for validity */
5327 case EITEM_PRVSCHECK:
5329 uschar * sub_arg[3], * p;
5331 const pcre2_code * re;
5333 /* Reset expansion variables */
5334 prvscheck_result = NULL;
5335 prvscheck_address = NULL;
5336 prvscheck_keynum = NULL;
5338 switch(read_subs(sub_arg, 1, 1, &s, flags, FALSE, name, &resetok, NULL))
5340 case 1: goto EXPAND_FAILED_CURLY;
5342 case 3: goto EXPAND_FAILED;
5345 re = regex_must_compile(
5346 US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5347 MCS_CASELESS | MCS_CACHEABLE, FALSE);
5349 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5351 uschar * local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5352 uschar * key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5353 uschar * daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5354 uschar * hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5355 uschar * domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5359 debug_printf_indent("prvscheck localpart: %s\n", local_part);
5360 debug_printf_indent("prvscheck key number: %s\n", key_num);
5361 debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5362 debug_printf_indent("prvscheck hash: %s\n", hash);
5363 debug_printf_indent("prvscheck domain: %s\n", domain);
5366 /* Set up expansion variables */
5367 g = string_cat (NULL, local_part);
5368 g = string_catn(g, US"@", 1);
5369 g = string_cat (g, domain);
5370 prvscheck_address = string_from_gstring(g);
5371 prvscheck_keynum = string_copy(key_num);
5373 /* Now expand the second argument */
5374 switch(read_subs(sub_arg, 1, 1, &s, flags, FALSE, name, &resetok, NULL))
5376 case 1: goto EXPAND_FAILED_CURLY;
5378 case 3: goto EXPAND_FAILED;
5381 /* Now we have the key and can check the address. */
5383 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5387 expand_string_message = US"hmac-sha1 conversion failed";
5391 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5392 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5394 if (Ustrcmp(p,hash) == 0)
5396 /* Success, valid BATV address. Now check the expiry date. */
5397 uschar *now = prvs_daystamp(0);
5398 unsigned int inow = 0,iexpire = 1;
5400 (void)sscanf(CS now,"%u",&inow);
5401 (void)sscanf(CS daystamp,"%u",&iexpire);
5403 /* When "iexpire" is < 7, a "flip" has occurred.
5404 Adjust "inow" accordingly. */
5405 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5407 if (iexpire >= inow)
5409 prvscheck_result = US"1";
5410 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $prvscheck_result set to 1\n");
5414 prvscheck_result = NULL;
5415 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $prvscheck_result unset\n");
5420 prvscheck_result = NULL;
5421 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $prvscheck_result unset\n");
5424 /* Now expand the final argument. We leave this till now so that
5425 it can include $prvscheck_result. */
5427 switch(read_subs(sub_arg, 1, 0, &s, flags, TRUE, name, &resetok, NULL))
5429 case 1: goto EXPAND_FAILED_CURLY;
5431 case 3: goto EXPAND_FAILED;
5434 yield = string_cat(yield,
5435 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5437 /* Reset the "internal" variables afterwards, because they are in
5438 dynamic store that will be reclaimed if the expansion succeeded. */
5440 prvscheck_address = NULL;
5441 prvscheck_keynum = NULL;
5444 /* Does not look like a prvs encoded address, return the empty string.
5445 We need to make sure all subs are expanded first, so as to skip over
5448 switch(read_subs(sub_arg, 2, 1, &s, flags, TRUE, name, &resetok, NULL))
5450 case 1: goto EXPAND_FAILED_CURLY;
5452 case 3: goto EXPAND_FAILED;
5455 if (flags & ESI_SKIPPING) continue;
5459 /* Handle "readfile" to insert an entire file */
5461 case EITEM_READFILE:
5464 uschar * sub_arg[2];
5466 if ((expand_forbid & RDO_READFILE) != 0)
5468 expand_string_message = US"file insertions are not permitted";
5472 switch(read_subs(sub_arg, 2, 1, &s, flags, TRUE, name, &resetok, NULL))
5474 case -1: continue; /* If skipping, we don't actually do anything */
5475 case 1: goto EXPAND_FAILED_CURLY;
5477 case 3: goto EXPAND_FAILED;
5480 /* Open the file and read it */
5482 if (!(f = Ufopen(sub_arg[0], "rb")))
5484 expand_string_message = string_open_failed("%s", sub_arg[0]);
5488 yield = cat_file(f, yield, sub_arg[1]);
5493 /* Handle "readsocket" to insert data from a socket, either
5494 Inet or Unix domain */
5496 case EITEM_READSOCK:
5499 uschar * sub_arg[4];
5501 if (expand_forbid & RDO_READSOCK)
5503 expand_string_message = US"socket insertions are not permitted";
5507 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5508 because there may be a string for expansion on failure. */
5510 switch(read_subs(sub_arg, 4, 2, &s, flags, FALSE, name, &resetok, NULL))
5512 case 1: goto EXPAND_FAILED_CURLY;
5513 case 2: /* Won't occur: no end check */
5514 case 3: goto EXPAND_FAILED;
5517 /* If skipping, we don't actually do anything. Otherwise, arrange to
5518 connect to either an IP or a Unix socket. */
5520 if (!(flags & ESI_SKIPPING))
5522 const lookup_info * li = search_findtype(US"readsock", 8);
5525 int expand_setup = -1;
5530 expand_string_message = search_error_message;
5534 /* If the reqstr is empty, flag that and set a dummy */
5538 g = string_append_listele(g, ',', US"send=no");
5539 sub_arg[1] = US"DUMMY";
5542 /* Re-marshall the options */
5546 const uschar * list = sub_arg[2];
5550 /* First option has no tag and is timeout */
5551 if ((item = string_nextinlist(&list, &sep, NULL, 0)))
5552 g = string_append_listele(g, ',',
5553 string_sprintf("timeout=%s", item));
5555 /* The rest of the options from the expansion */
5556 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5557 g = string_append_listele(g, ',', item);
5559 /* possibly plus an EOL string. Process with escapes, to protect
5560 from list-processing. The only current user of eol= in search
5561 options is the readsock expansion. */
5563 if (sub_arg[3] && *sub_arg[3])
5564 g = string_append_listele(g, ',',
5565 string_sprintf("eol=%s",
5566 string_printing2(sub_arg[3], SP_TAB|SP_SPACE)));
5569 /* Gat a (possibly cached) handle for the connection */
5571 if (!(handle = search_open(sub_arg[0], li, 0, NULL, NULL)))
5573 if (*expand_string_message) goto EXPAND_FAILED;
5574 expand_string_message = search_error_message;
5575 search_error_message = NULL;
5579 /* Get (possibly cached) results for the lookup */
5580 /* sspec: sub_arg[0] req: sub_arg[1] opts: g */
5582 if ((s = search_find(handle, sub_arg[0], sub_arg[1], -1, NULL, 0, 0,
5583 &expand_setup, string_from_gstring(g))))
5584 yield = string_cat(yield, s);
5585 else if (f.search_find_defer)
5587 expand_string_message = search_error_message;
5588 search_error_message = NULL;
5592 { /* should not happen, at present */
5593 expand_string_message = search_error_message;
5594 search_error_message = NULL;
5599 /* The whole thing has worked (or we were skipping). If there is a
5600 failure string following, we need to skip it. */
5602 if (*s == '{') /*}*/
5604 if (!expand_string_internal(s+1,
5605 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL))
5606 goto EXPAND_FAILED; /*{*/
5609 expand_string_message = US"missing '}' closing failstring for readsocket";
5610 goto EXPAND_FAILED_CURLY;
5612 Uskip_whitespace(&s);
5615 READSOCK_DONE: /*{*/
5618 expand_string_message = US"missing '}' closing readsocket";
5619 goto EXPAND_FAILED_CURLY;
5621 if (flags & ESI_SKIPPING) continue;
5624 /* Come here on failure to create socket, connect socket, write to the
5625 socket, or timeout on reading. If another substring follows, expand and
5626 use it. Otherwise, those conditions give expand errors. */
5629 if (*s != '{') goto EXPAND_FAILED; /*}*/
5630 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5631 if (!(arg = expand_string_internal(s+1,
5632 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR, &s, &resetok, NULL)))
5634 yield = string_cat(yield, arg); /*{*/
5637 expand_string_message = US"missing '}' closing failstring for readsocket";
5638 goto EXPAND_FAILED_CURLY;
5640 Uskip_whitespace(&s);
5644 /* Handle "run" to execute a program. */
5649 const uschar * arg, ** argv;
5650 unsigned late_expand = TSUC_EXPAND_ARGS | TSUC_ALLOW_TAINTED_ARGS | TSUC_ALLOW_RECIPIENTS;
5652 if (expand_forbid & RDO_RUN)
5654 expand_string_message = US"running a command is not permitted";
5658 /* Handle options to the "run" */
5661 if (Ustrncmp(++s, "preexpand", 9) == 0)
5662 { late_expand = 0; s += 9; }
5665 const uschar * t = s;
5666 while (isalpha(*++t)) ;
5667 expand_string_message = string_sprintf("bad option '%.*s' for run",
5671 Uskip_whitespace(&s);
5673 if (*s != '{') /*}*/
5675 expand_string_message = US"missing '{' for command arg of run";
5676 goto EXPAND_FAILED_CURLY; /*"}*/
5680 if (late_expand) /* this is the default case */
5684 /* Locate the end of the args */
5685 (void) expand_string_internal(s,
5686 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &t, NULL, NULL);
5688 arg = flags & ESI_SKIPPING ? NULL : string_copyn(s, n);
5694 debug_printf_indent("args string for ${run} expand before split\n");
5695 if (!(arg = expand_string_internal(s,
5696 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
5698 Uskip_whitespace(&s);
5703 expand_string_message = US"missing '}' closing command arg of run";
5704 goto EXPAND_FAILED_CURLY;
5707 if (flags & ESI_SKIPPING) /* Just pretend it worked when we're skipping */
5710 lookup_value = NULL;
5717 if (!transport_set_up_command(&argv, /* anchor for arg list */
5718 arg, /* raw command */
5719 late_expand, /* expand args if not already done */
5720 0, /* not relevant when... */
5721 NULL, /* no transporting address */
5722 US"${run} expansion", /* for error messages */
5723 &expand_string_message)) /* where to put error message */
5726 /* Create the child process, making it a group leader. */
5728 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5729 US"expand-run")) < 0)
5731 expand_string_message =
5732 string_sprintf("couldn't create child process: %s", strerror(errno));
5736 /* Nothing is written to the standard input. */
5740 /* Read the pipe to get the command's output into $value (which is kept
5741 in lookup_value). Read during execution, so that if the output exceeds
5742 the OS pipe buffer limit, we don't block forever. Remember to not release
5743 memory just allocated for $value. */
5746 f = fdopen(fd_out, "rb");
5747 sigalrm_seen = FALSE;
5749 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5753 /* Wait for the process to finish, applying the timeout, and inspect its
5754 return code for serious disasters. Simple non-zero returns are passed on.
5757 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5759 if (sigalrm_seen || runrc == -256)
5761 expand_string_message = US"command timed out";
5762 killpg(pid, SIGKILL); /* Kill the whole process group */
5765 else if (runrc == -257)
5766 expand_string_message = string_sprintf("wait() failed: %s",
5770 expand_string_message = string_sprintf("command killed by signal %d",
5777 /* Process the yes/no strings; $value may be useful in both cases */
5779 switch(process_yesno(
5780 flags, /* were previously skipping */
5781 runrc == 0, /* success/failure indicator */
5782 lookup_value, /* value to reset for string2 */
5783 &s, /* input pointer */
5784 &yield, /* output pointer */
5785 US"run", /* condition type */
5788 case 1: goto EXPAND_FAILED; /* when all is well, the */
5789 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5792 if (flags & ESI_SKIPPING) continue;
5796 /* Handle character translation for "tr" */
5800 int oldptr = gstring_length(yield);
5804 switch(read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, NULL))
5806 case -1: continue; /* skipping */
5807 case 1: goto EXPAND_FAILED_CURLY;
5809 case 3: goto EXPAND_FAILED;
5812 if ( (yield = string_cat(yield, sub[0]))
5813 && (o2m = Ustrlen(sub[2]) - 1) >= 0)
5814 for (; oldptr < yield->ptr; oldptr++)
5816 uschar * m = Ustrrchr(sub[1], yield->s[oldptr]);
5820 yield->s[oldptr] = sub[2][o < o2m ? o : o2m];
5827 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5828 expanded arguments. */
5837 int val[2] = { 0, -1 };
5840 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5841 Ensure that sub[2] is set in the ${length } case. */
5844 switch(read_subs(sub, item_type == EITEM_LENGTH ? 2:3, 2, &s, flags,
5845 TRUE, name, &resetok, NULL))
5847 case -1: continue; /* skipping */
5848 case 1: goto EXPAND_FAILED_CURLY;
5850 case 3: goto EXPAND_FAILED;
5853 /* Juggle the arguments if there are only two of them: always move the
5854 string to the last position and make ${length{n}{str}} equivalent to
5855 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5861 if (item_type == EITEM_LENGTH)
5868 for (int i = 0; i < 2; i++) if (sub[i])
5870 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5871 if (*ret != 0 || (i != 0 && val[i] < 0))
5873 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5874 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5880 item_type == EITEM_HASH
5881 ? compute_hash(sub[2], val[0], val[1], &len)
5882 : item_type == EITEM_NHASH
5883 ? compute_nhash(sub[2], val[0], val[1], &len)
5884 : extract_substr(sub[2], val[0], val[1], &len);
5887 yield = string_catn(yield, ret, len);
5891 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5892 This code originally contributed by Steve Haslam. It currently supports
5893 the use of MD5 and SHA-1 hashes.
5895 We need some workspace that is large enough to handle all the supported
5896 hash types. Use macros to set the sizes rather than be too elaborate. */
5898 #define MAX_HASHLEN 20
5899 #define MAX_HASHBLOCKLEN 64
5908 int hashlen; /* Number of octets for the hash algorithm's output */
5909 int hashblocklen; /* Number of octets the hash algorithm processes */
5910 uschar * keyptr, * p;
5911 unsigned int keylen;
5913 uschar keyhash[MAX_HASHLEN];
5914 uschar innerhash[MAX_HASHLEN];
5915 uschar finalhash[MAX_HASHLEN];
5916 uschar finalhash_hex[2*MAX_HASHLEN];
5917 uschar innerkey[MAX_HASHBLOCKLEN];
5918 uschar outerkey[MAX_HASHBLOCKLEN];
5920 switch (read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, NULL))
5922 case -1: continue; /* skipping */
5923 case 1: goto EXPAND_FAILED_CURLY;
5925 case 3: goto EXPAND_FAILED;
5928 if (Ustrcmp(sub[0], "md5") == 0)
5931 use_base = &md5_base;
5935 else if (Ustrcmp(sub[0], "sha1") == 0)
5938 use_base = &sha1_ctx;
5944 expand_string_message =
5945 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5950 keylen = Ustrlen(keyptr);
5952 /* If the key is longer than the hash block length, then hash the key
5955 if (keylen > hashblocklen)
5957 chash_start(type, use_base);
5958 chash_end(type, use_base, keyptr, keylen, keyhash);
5963 /* Now make the inner and outer key values */
5965 memset(innerkey, 0x36, hashblocklen);
5966 memset(outerkey, 0x5c, hashblocklen);
5968 for (int i = 0; i < keylen; i++)
5970 innerkey[i] ^= keyptr[i];
5971 outerkey[i] ^= keyptr[i];
5974 /* Now do the hashes */
5976 chash_start(type, use_base);
5977 chash_mid(type, use_base, innerkey);
5978 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5980 chash_start(type, use_base);
5981 chash_mid(type, use_base, outerkey);
5982 chash_end(type, use_base, innerhash, hashlen, finalhash);
5984 /* Encode the final hash as a hex string */
5987 for (int i = 0; i < hashlen; i++)
5989 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5990 *p++ = hex_digits[finalhash[i] & 0x0f];
5993 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5994 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5996 yield = string_catn(yield, finalhash_hex, hashlen*2);
6000 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
6001 We have to save the numerical variables and restore them afterwards. */
6005 const pcre2_code * re;
6006 int moffset, moffsetextra, slen;
6007 pcre2_match_data * md;
6009 uschar * subject, * sub[3];
6010 int save_expand_nmax =
6011 save_expand_strings(save_expand_nstring, save_expand_nlength);
6012 unsigned sub_textonly = 0;
6014 switch(read_subs(sub, 3, 3, &s, flags, TRUE, name, &resetok, &sub_textonly))
6016 case -1: continue; /* skipping */
6017 case 1: goto EXPAND_FAILED_CURLY;
6019 case 3: goto EXPAND_FAILED;
6022 /* Compile the regular expression */
6024 re = regex_compile(sub[1],
6025 sub_textonly & BIT(1) ? MCS_CACHEABLE : MCS_NOFLAGS,
6026 &expand_string_message, pcre_gen_cmp_ctx);
6030 md = pcre2_match_data_create(EXPAND_MAXN + 1, pcre_gen_ctx);
6032 /* Now run a loop to do the substitutions as often as necessary. It ends
6033 when there are no more matches. Take care over matches of the null string;
6034 do the same thing as Perl does. */
6037 slen = Ustrlen(sub[0]);
6038 moffset = moffsetextra = 0;
6043 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
6044 int n = pcre2_match(re, (PCRE2_SPTR)subject, slen, moffset + moffsetextra,
6045 PCRE_EOPT | emptyopt, md, pcre_gen_mtc_ctx);
6048 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
6049 is not necessarily the end. We want to repeat the match from one
6050 character further along, but leaving the basic offset the same (for
6051 copying below). We can't be at the end of the string - that was checked
6052 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
6053 finished; copy the remaining string and end the loop. */
6063 yield = string_catn(yield, subject+moffset, slen-moffset);
6067 /* Match - set up for expanding the replacement. */
6068 DEBUG(D_expand) debug_printf_indent("%s: match\n", name);
6070 if (n == 0) n = EXPAND_MAXN + 1;
6072 for (int nn = 0; nn < n*2; nn += 2)
6074 expand_nstring[expand_nmax] = subject + ovec[nn];
6075 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
6079 /* Copy the characters before the match, plus the expanded insertion. */
6081 yield = string_catn(yield, subject + moffset, ovec[0] - moffset);
6083 if (!(insert = expand_string(sub[2])))
6085 yield = string_cat(yield, insert);
6091 /* If we have matched an empty string, first check to see if we are at
6092 the end of the subject. If so, the loop is over. Otherwise, mimic
6093 what Perl's /g options does. This turns out to be rather cunning. First
6094 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
6095 string at the same point. If this fails (picked up above) we advance to
6096 the next character. */
6098 if (ovec[0] == ovec[1])
6100 if (ovec[0] == slen) break;
6101 emptyopt = PCRE2_NOTEMPTY | PCRE2_ANCHORED;
6105 /* All done - restore numerical variables. */
6107 /* pcre2_match_data_free(md); gen ctx needs no free */
6108 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6109 save_expand_nlength);
6113 /* Handle keyed and numbered substring extraction. If the first argument
6114 consists entirely of digits, then a numerical extraction is assumed. */
6118 int field_number = 1;
6119 BOOL field_number_set = FALSE;
6120 uschar * save_lookup_value = lookup_value, * sub[3];
6121 int save_expand_nmax =
6122 save_expand_strings(save_expand_nstring, save_expand_nlength);
6124 /* On reflection the original behaviour of extract-json for a string
6125 result, leaving it quoted, was a mistake. But it was already published,
6126 hence the addition of jsons. In a future major version, make json
6127 work like josons, and withdraw jsons. */
6129 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6131 /* Check for a format-variant specifier */
6133 if (Uskip_whitespace(&s) != '{') /*}*/
6134 if (Ustrncmp(s, "json", 4) == 0)
6135 if (*(s += 4) == 's')
6136 {fmt = extract_jsons; s++;}
6140 /* While skipping we cannot rely on the data for expansions being
6141 available (eg. $item) hence cannot decide on numeric vs. keyed.
6142 Read a maximum of 5 arguments (including the yes/no) */
6144 if (flags & ESI_SKIPPING)
6146 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6148 if (!expand_string_internal(s+1,
6149 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL))
6150 goto EXPAND_FAILED; /*'{'*/
6153 expand_string_message = US"missing '{' for arg of extract";
6154 goto EXPAND_FAILED_CURLY;
6156 Uskip_whitespace(&s);
6158 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6159 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6163 Uskip_whitespace(&s);
6167 expand_string_message = US"missing '}' closing extract";
6168 goto EXPAND_FAILED_CURLY;
6172 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6174 if (Uskip_whitespace(&s) == '{') /*'}'*/
6176 if (!(sub[i] = expand_string_internal(s+1,
6177 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
6178 goto EXPAND_FAILED; /*'{'*/
6181 expand_string_message = string_sprintf(
6182 "missing '}' closing arg %d of extract", i+1);
6183 goto EXPAND_FAILED_CURLY;
6186 /* After removal of leading and trailing white space, the first
6187 argument must not be empty; if it consists entirely of digits
6188 (optionally preceded by a minus sign), this is a numerical
6189 extraction, and we expect 3 arguments (normal) or 2 (json). */
6195 uschar * p = sub[0];
6197 Uskip_whitespace(&p);
6201 while (len > 0 && isspace(p[len-1])) len--;
6206 expand_string_message = US"first argument of \"extract\" must "
6216 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6220 if (fmt == extract_basic) j = 3; /* Need 3 args */
6221 field_number_set = TRUE;
6227 expand_string_message = string_sprintf(
6228 "missing '{' for arg %d of extract", i+1);
6229 goto EXPAND_FAILED_CURLY;
6233 /* Extract either the numbered or the keyed substring into $value. If
6234 skipping, just pretend the extraction failed. */
6236 if (flags & ESI_SKIPPING)
6237 lookup_value = NULL;
6241 lookup_value = field_number_set
6242 ? expand_gettokened(field_number, sub[1], sub[2])
6243 : expand_getkeyed(sub[0], sub[1]);
6250 const uschar * list;
6252 /* Array: Bracket-enclosed and comma-separated.
6253 Object: Brace-enclosed, comma-sep list of name:value pairs */
6255 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6257 expand_string_message =
6258 string_sprintf("%s wrapping %s for extract json",
6259 expand_string_message,
6260 field_number_set ? "array" : "object");
6261 goto EXPAND_FAILED_CURLY;
6265 if (field_number_set)
6267 if (field_number <= 0)
6269 expand_string_message = US"first argument of \"extract\" must "
6270 "be greater than zero";
6273 while (field_number > 0 && (item = json_nextinlist(&list)))
6275 if ((lookup_value = s = item))
6278 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6283 lookup_value = NULL;
6284 while ((item = json_nextinlist(&list)))
6286 /* Item is: string name-sep value. string is quoted.
6287 Dequote the string and compare with the search key. */
6289 if (!(item = dewrap(item, US"\"\"")))
6291 expand_string_message =
6292 string_sprintf("%s wrapping string key for extract json",
6293 expand_string_message);
6294 goto EXPAND_FAILED_CURLY;
6296 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6298 s = item + Ustrlen(item) + 1;
6299 if (Uskip_whitespace(&s) != ':')
6301 expand_string_message =
6302 US"missing object value-separator for extract json";
6303 goto EXPAND_FAILED_CURLY;
6306 Uskip_whitespace(&s);
6314 if ( fmt == extract_jsons
6316 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6318 expand_string_message =
6319 string_sprintf("%s wrapping string result for extract jsons",
6320 expand_string_message);
6321 goto EXPAND_FAILED_CURLY;
6326 /* If no string follows, $value gets substituted; otherwise there can
6327 be yes/no strings, as for lookup or if. */
6329 switch(process_yesno(
6330 flags, /* were previously skipping */
6331 lookup_value != NULL, /* success/failure indicator */
6332 save_lookup_value, /* value to reset for string2 */
6333 &s, /* input pointer */
6334 &yield, /* output pointer */
6335 US"extract", /* condition type */
6338 case 1: goto EXPAND_FAILED; /* when all is well, the */
6339 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6342 /* All done - restore numerical variables. */
6344 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6345 save_expand_nlength);
6347 if (flags & ESI_SKIPPING) continue;
6351 /* return the Nth item from a list */
6353 case EITEM_LISTEXTRACT:
6355 int field_number = 1;
6356 uschar * save_lookup_value = lookup_value, * sub[2];
6357 int save_expand_nmax =
6358 save_expand_strings(save_expand_nstring, save_expand_nlength);
6360 /* Read the field & list arguments */
6361 /*XXX Could we use read_subs here (and get better efficiency for skipping)? */
6363 for (int i = 0; i < 2; i++)
6365 if (Uskip_whitespace(&s) != '{') /*}*/
6367 expand_string_message = string_sprintf(
6368 "missing '{' for arg %d of listextract", i+1); /*}*/
6369 goto EXPAND_FAILED_CURLY;
6372 sub[i] = expand_string_internal(s+1,
6373 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6374 if (!sub[i]) goto EXPAND_FAILED; /*{{*/
6377 expand_string_message = string_sprintf(
6378 "missing '}' closing arg %d of listextract", i+1);
6379 goto EXPAND_FAILED_CURLY;
6382 /* After removal of leading and trailing white space, the first
6383 argument must be numeric and nonempty. */
6391 Uskip_whitespace(&p);
6395 while (len > 0 && isspace(p[len-1])) len--;
6398 if (!*p && !(flags & ESI_SKIPPING))
6400 expand_string_message = US"first argument of \"listextract\" must "
6410 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6413 expand_string_message = US"first argument of \"listextract\" must "
6421 /* Extract the numbered element into $value. If
6422 skipping, just pretend the extraction failed. */
6424 lookup_value = flags & ESI_SKIPPING ? NULL : expand_getlistele(field_number, sub[1]);
6426 /* If no string follows, $value gets substituted; otherwise there can
6427 be yes/no strings, as for lookup or if. */
6429 switch(process_yesno(
6430 flags, /* were previously skipping */
6431 lookup_value != NULL, /* success/failure indicator */
6432 save_lookup_value, /* value to reset for string2 */
6433 &s, /* input pointer */
6434 &yield, /* output pointer */
6435 US"listextract", /* condition type */
6438 case 1: goto EXPAND_FAILED; /* when all is well, the */
6439 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6442 /* All done - restore numerical variables. */
6444 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6445 save_expand_nlength);
6447 if (flags & ESI_SKIPPING) continue;
6451 case EITEM_LISTQUOTE:
6454 switch(read_subs(sub, 2, 2, &s, flags, TRUE, name, &resetok, NULL))
6456 case -1: continue; /* skipping */
6457 case 1: goto EXPAND_FAILED_CURLY;
6459 case 3: goto EXPAND_FAILED;
6461 if (*sub[1]) for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6463 if (c == sep) yield = string_catn(yield, sub[1], 1);
6464 yield = string_catn(yield, sub[1], 1);
6466 else yield = string_catn(yield, US" ", 1);
6471 case EITEM_CERTEXTRACT:
6473 uschar * save_lookup_value = lookup_value, * sub[2];
6474 int save_expand_nmax =
6475 save_expand_strings(save_expand_nstring, save_expand_nlength);
6477 /* Read the field argument */
6478 if (Uskip_whitespace(&s) != '{') /*}*/
6480 expand_string_message = US"missing '{' for field arg of certextract";
6481 goto EXPAND_FAILED_CURLY; /*}*/
6483 sub[0] = expand_string_internal(s+1,
6484 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6485 if (!sub[0]) goto EXPAND_FAILED; /*{{*/
6488 expand_string_message = US"missing '}' closing field arg of certextract";
6489 goto EXPAND_FAILED_CURLY;
6491 /* strip spaces fore & aft */
6496 Uskip_whitespace(&p);
6500 while (len > 0 && isspace(p[len-1])) len--;
6504 /* inspect the cert argument */
6505 if (Uskip_whitespace(&s) != '{') /*}*/
6507 expand_string_message = US"missing '{' for cert variable arg of certextract";
6508 goto EXPAND_FAILED_CURLY; /*}*/
6512 expand_string_message = US"second argument of \"certextract\" must "
6513 "be a certificate variable";
6516 sub[1] = expand_string_internal(s+1,
6517 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s, &resetok, NULL);
6518 if (!sub[1]) goto EXPAND_FAILED; /*{{*/
6521 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6522 goto EXPAND_FAILED_CURLY;
6525 if (flags & ESI_SKIPPING)
6526 lookup_value = NULL;
6529 lookup_value = expand_getcertele(sub[0], sub[1]);
6530 if (*expand_string_message) goto EXPAND_FAILED;
6532 switch(process_yesno(
6533 flags, /* were previously skipping */
6534 lookup_value != NULL, /* success/failure indicator */
6535 save_lookup_value, /* value to reset for string2 */
6536 &s, /* input pointer */
6537 &yield, /* output pointer */
6538 US"certextract", /* condition type */
6541 case 1: goto EXPAND_FAILED; /* when all is well, the */
6542 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6545 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6546 save_expand_nlength);
6547 if (flags & ESI_SKIPPING) continue;
6550 #endif /*DISABLE_TLS*/
6552 /* Handle list operations */
6558 int sep = 0, save_ptr = gstring_length(yield);
6559 uschar outsep[2] = { '\0', '\0' };
6560 const uschar *list, *expr, *temp;
6561 uschar * save_iterate_item = iterate_item;
6562 uschar * save_lookup_value = lookup_value;
6564 Uskip_whitespace(&s);
6565 if (*s++ != '{') /*}*/
6567 expand_string_message =
6568 string_sprintf("missing '{' for first arg of %s", name);
6569 goto EXPAND_FAILED_CURLY; /*}*/
6572 DEBUG(D_expand) debug_printf_indent("%s: evaluate input list list\n", name);
6573 if (!(list = expand_string_internal(s,
6574 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL)))
6575 goto EXPAND_FAILED; /*{{*/
6578 expand_string_message =
6579 string_sprintf("missing '}' closing first arg of %s", name);
6580 goto EXPAND_FAILED_CURLY;
6583 if (item_type == EITEM_REDUCE)
6586 Uskip_whitespace(&s);
6587 if (*s++ != '{') /*}*/
6589 expand_string_message = US"missing '{' for second arg of reduce";
6590 goto EXPAND_FAILED_CURLY; /*}*/
6592 DEBUG(D_expand) debug_printf_indent("reduce: initial result list\n");
6593 t = expand_string_internal(s,
6594 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6595 if (!t) goto EXPAND_FAILED;
6596 lookup_value = t; /*{{*/
6599 expand_string_message = US"missing '}' closing second arg of reduce";
6600 goto EXPAND_FAILED_CURLY;
6604 Uskip_whitespace(&s);
6605 if (*s++ != '{') /*}*/
6607 expand_string_message =
6608 string_sprintf("missing '{' for last arg of %s", name); /*}*/
6609 goto EXPAND_FAILED_CURLY;
6614 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6615 if scanning a "false" part). This allows us to find the end of the
6616 condition, because if the list is empty, we won't actually evaluate the
6617 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6618 the normal internal expansion function. */
6620 DEBUG(D_expand) debug_printf_indent("%s: find end of conditionn\n", name);
6621 if (item_type != EITEM_FILTER)
6622 temp = expand_string_internal(s,
6623 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL);
6625 if ((temp = eval_condition(expr, &resetok, NULL))) s = temp;
6629 expand_string_message = string_sprintf("%s inside \"%s\" item",
6630 expand_string_message, name);
6634 Uskip_whitespace(&s); /*{{{*/
6637 expand_string_message = string_sprintf("missing } at end of condition "
6638 "or expression inside \"%s\"; could be an unquoted } in the content",
6643 Uskip_whitespace(&s); /*{{*/
6646 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6651 /* If we are skipping, we can now just move on to the next item. When
6652 processing for real, we perform the iteration. */
6654 if (flags & ESI_SKIPPING) continue;
6655 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6657 *outsep = (uschar)sep; /* Separator as a string */
6659 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6660 name, iterate_item, lookup_value);
6662 if (item_type == EITEM_FILTER)
6665 /* the condition could modify $value, as a side-effect */
6666 uschar * save_value = lookup_value;
6668 if (!eval_condition(expr, &resetok, &condresult))
6670 iterate_item = save_iterate_item;
6671 lookup_value = save_lookup_value;
6672 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6673 expand_string_message, name);
6676 lookup_value = save_value;
6677 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6678 condresult? "true":"false");
6680 temp = iterate_item; /* TRUE => include this item */
6682 continue; /* FALSE => skip this item */
6685 else /* EITEM_MAP and EITEM_REDUCE */
6687 /* the expansion could modify $value, as a side-effect */
6688 uschar * t = expand_string_internal(expr,
6689 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, NULL, &resetok, NULL);
6692 iterate_item = save_iterate_item;
6693 expand_string_message = string_sprintf("%s inside \"%s\" item",
6694 expand_string_message, name);
6697 if (item_type == EITEM_REDUCE)
6699 lookup_value = t; /* Update the value of $value */
6700 continue; /* and continue the iteration */
6704 /* We reach here for FILTER if the condition is true, always for MAP,
6705 and never for REDUCE. The value in "temp" is to be added to the output
6706 list that is being created, ensuring that any occurrences of the
6707 separator character are doubled. Unless we are dealing with the first
6708 item of the output list, add in a space if the new item begins with the
6709 separator character, or is an empty string. */
6711 /*XXX is there not a standard support function for this, appending to a list? */
6712 /* yes, string_append_listele(), but it depends on lack of text before the list */
6714 if ( yield && yield->ptr != save_ptr
6715 && (temp[0] == *outsep || temp[0] == 0))
6716 yield = string_catn(yield, US" ", 1);
6718 /* Add the string in "temp" to the output list that we are building,
6719 This is done in chunks by searching for the separator character. */
6723 size_t seglen = Ustrcspn(temp, outsep);
6725 yield = string_catn(yield, temp, seglen + 1);
6727 /* If we got to the end of the string we output one character
6728 too many; backup and end the loop. Otherwise arrange to double the
6731 if (!temp[seglen]) { yield->ptr--; break; }
6732 yield = string_catn(yield, outsep, 1);
6736 /* Output a separator after the string: we will remove the redundant
6737 final one at the end. */
6739 yield = string_catn(yield, outsep, 1);
6740 } /* End of iteration over the list loop */
6742 /* REDUCE has generated no output above: output the final value of
6745 if (item_type == EITEM_REDUCE)
6747 yield = string_cat(yield, lookup_value);
6748 lookup_value = save_lookup_value; /* Restore $value */
6751 /* FILTER and MAP generate lists: if they have generated anything, remove
6752 the redundant final separator. Even though an empty item at the end of a
6753 list does not count, this is tidier. */
6755 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6757 /* Restore preserved $item */
6759 iterate_item = save_iterate_item;
6760 if (flags & ESI_SKIPPING) continue;
6766 int sep = 0, cond_type;
6767 const uschar * srclist, * cmp, * xtract;
6768 uschar * opname, * srcitem;
6769 const uschar * dstlist = NULL, * dstkeylist = NULL;
6770 uschar * tmp, * save_iterate_item = iterate_item;
6772 Uskip_whitespace(&s);
6773 if (*s++ != '{') /*}*/
6775 expand_string_message = US"missing '{' for list arg of sort";
6776 goto EXPAND_FAILED_CURLY; /*}*/
6779 srclist = expand_string_internal(s,
6780 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
6781 if (!srclist) goto EXPAND_FAILED; /*{{*/
6784 expand_string_message = US"missing '}' closing list arg of sort";
6785 goto EXPAND_FAILED_CURLY;
6788 Uskip_whitespace(&s);
6789 if (*s++ != '{') /*}*/
6791 expand_string_message = US"missing '{' for comparator arg of sort";
6792 goto EXPAND_FAILED_CURLY; /*}*/
6795 cmp = expand_string_internal(s,
6796 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s, &resetok, NULL);
6797 if (!cmp) goto EXPAND_FAILED; /*{{*/
6800 expand_string_message = US"missing '}' closing comparator arg of sort";
6801 goto EXPAND_FAILED_CURLY;
6804 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6806 if (!expand_string_message)
6807 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6812 case ECOND_NUM_L: case ECOND_NUM_LE:
6813 case ECOND_NUM_G: case ECOND_NUM_GE:
6814 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6815 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6819 expand_string_message = US"comparator not handled for sort";
6823 Uskip_whitespace(&s);
6824 if (*s++ != '{') /*}*/
6826 expand_string_message = US"missing '{' for extractor arg of sort";
6827 goto EXPAND_FAILED_CURLY; /*}*/
6831 if (!(tmp = expand_string_internal(s,
6832 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | ESI_SKIPPING, &s, &resetok, NULL)))
6834 xtract = string_copyn(xtract, s - xtract);
6838 expand_string_message = US"missing '}' closing extractor arg of sort";
6839 goto EXPAND_FAILED_CURLY;
6844 expand_string_message = US"missing } at end of \"sort\"";
6848 if (flags & ESI_SKIPPING) continue;
6850 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6852 uschar * srcfield, * dstitem;
6853 gstring * newlist = NULL, * newkeylist = NULL;
6855 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6857 /* extract field for comparisons */
6858 iterate_item = srcitem;
6859 if ( !(srcfield = expand_string_internal(xtract,
6860 ESI_HONOR_DOLLAR, NULL, &resetok, NULL))
6863 expand_string_message = string_sprintf(
6864 "field-extract in sort: \"%s\"", xtract);
6868 /* Insertion sort */
6870 /* copy output list until new-item < list-item */
6871 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6875 /* field for comparison */
6876 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6879 /* String-comparator names start with a letter; numeric names do not */
6881 if (sortsbefore(cond_type, isalpha(opname[0]),
6882 srcfield, dstfield))
6884 /* New-item sorts before this dst-item. Append new-item,
6885 then dst-item, then remainder of dst list. */
6887 newlist = string_append_listele(newlist, sep, srcitem);
6888 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6891 newlist = string_append_listele(newlist, sep, dstitem);
6892 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6894 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6895 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6897 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6899 newlist = string_append_listele(newlist, sep, dstitem);
6900 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6906 newlist = string_append_listele(newlist, sep, dstitem);
6907 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6910 /* If we ran out of dstlist without consuming srcitem, append it */
6913 newlist = string_append_listele(newlist, sep, srcitem);
6914 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6917 dstlist = newlist->s;
6918 dstkeylist = newkeylist->s;
6920 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6921 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6925 yield = string_cat(yield, dstlist);
6927 /* Restore preserved $item */
6928 iterate_item = save_iterate_item;
6932 expand_string_message = US"Internal error in sort (list mismatch)";
6937 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6938 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6939 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6940 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6942 #define EXPAND_DLFUNC_MAX_ARGS 8
6945 #ifndef EXPAND_DLFUNC
6946 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6947 "is not included in this binary";
6950 #else /* EXPAND_DLFUNC */
6953 exim_dlfunc_t * func;
6956 uschar * argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6958 if (expand_forbid & RDO_DLFUNC)
6960 expand_string_message =
6961 US"dynamically-loaded functions are not permitted";
6965 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, flags,
6966 TRUE, name, &resetok, NULL))
6968 case -1: continue; /* skipping */
6969 case 1: goto EXPAND_FAILED_CURLY;
6971 case 3: goto EXPAND_FAILED;
6974 /* Look up the dynamically loaded object handle in the tree. If it isn't
6975 found, dlopen() the file and put the handle in the tree for next time. */
6977 if (!(t = tree_search(dlobj_anchor, argv[0])))
6979 void * handle = dlopen(CS argv[0], RTLD_LAZY);
6982 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6983 argv[0], dlerror());
6984 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6987 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), argv[0]);
6988 Ustrcpy(t->name, argv[0]);
6989 t->data.ptr = handle;
6990 (void)tree_insertnode(&dlobj_anchor, t);
6993 /* Having obtained the dynamically loaded object handle, look up the
6994 function pointer. */
6996 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6998 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6999 "%s", argv[1], argv[0], dlerror());
7000 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
7004 /* Call the function and work out what to do with the result. If it
7005 returns OK, we have a replacement string; if it returns DEFER then
7006 expansion has failed in a non-forced manner; if it returns FAIL then
7007 failure was forced; if it returns ERROR or any other value there's a
7008 problem, so panic slightly. In any case, assume that the function has
7009 side-effects on the store that must be preserved. */
7013 for (argc = 0; argv[argc]; argc++) ;
7015 if ((status = func(&result, argc - 2, &argv[2])) != OK)
7017 expand_string_message = result ? result : US"(no message)";
7018 if (status == FAIL_FORCED)
7019 f.expand_string_forcedfail = TRUE;
7020 else if (status != FAIL)
7021 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
7022 argv[0], argv[1], status, expand_string_message);
7026 if (result) yield = string_cat(yield, result);
7029 #endif /* EXPAND_DLFUNC */
7031 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
7034 uschar *save_lookup_value = lookup_value;
7036 if (Uskip_whitespace(&s) != '{') /*}*/
7039 key = expand_string_internal(s+1,
7040 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
7041 if (!key) goto EXPAND_FAILED; /*{{*/
7044 expand_string_message = US"missing '}' for name arg of env";
7045 goto EXPAND_FAILED_CURLY;
7048 lookup_value = US getenv(CS key);
7050 switch(process_yesno(
7051 flags, /* were previously skipping */
7052 lookup_value != NULL, /* success/failure indicator */
7053 save_lookup_value, /* value to reset for string2 */
7054 &s, /* input pointer */
7055 &yield, /* output pointer */
7056 US"env", /* condition type */
7059 case 1: goto EXPAND_FAILED; /* when all is well, the */
7060 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
7062 if (flags & ESI_SKIPPING) continue;
7067 case EITEM_SRS_ENCODE:
7068 /* ${srs_encode {secret} {return_path} {orig_domain}} */
7073 BOOL quoted = FALSE;
7075 switch (read_subs(sub, 3, 3, CUSS &s, flags, TRUE, name, &resetok, NULL))
7077 case -1: continue; /* skipping */
7078 case 1: goto EXPAND_FAILED_CURLY;
7080 case 3: goto EXPAND_FAILED;
7082 if (flags & ESI_SKIPPING) continue;
7084 if (sub[1] && *(sub[1]))
7086 g = string_catn(g, US"SRS0=", 5);
7088 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
7089 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
7090 g = string_catn(g, cksum, sizeof(cksum));
7091 g = string_catn(g, US"=", 1);
7093 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
7098 gettimeofday(&now, NULL);
7099 i = (now.tv_sec / 86400) & 0x3ff;
7100 g = string_catn(g, &base32_chars[i >> 5], 1);
7101 g = string_catn(g, &base32_chars[i & 0x1f], 1);
7103 g = string_catn(g, US"=", 1);
7105 /* ${domain:$return_path}=${local_part:$return_path} */
7107 int start, end, domain;
7108 uschar * t = parse_extract_address(sub[1], &expand_string_message,
7109 &start, &end, &domain, FALSE);
7115 if (domain > 0) g = string_cat(g, t + domain);
7116 g = string_catn(g, US"=", 1);
7118 s = domain > 0 ? string_copyn(t, domain - 1) : t;
7119 if ((quoted = Ustrchr(s, '"') != NULL))
7122 DEBUG(D_expand) debug_printf_indent("auto-quoting local part\n");
7123 while (*s) /* de-quote */
7125 while (*s && *s != '"') h = string_catn(h, s++, 1);
7127 while (*s && *s != '"') h = string_catn(h, s++, 1);
7130 gstring_release_unused(h);
7131 s = string_from_gstring(h);
7133 if (s) g = string_cat(g, s);
7136 /* Assume that if the original local_part had quotes
7137 it was for good reason */
7139 if (quoted) yield = string_catn(yield, US"\"", 1);
7140 yield = gstring_append(yield, g);
7141 if (quoted) yield = string_catn(yield, US"\"", 1);
7143 /* @$original_domain */
7144 yield = string_catn(yield, US"@", 1);
7145 yield = string_cat(yield, sub[2]);
7148 DEBUG(D_expand) debug_printf_indent("null return_path for srs-encode\n");
7152 #endif /*SUPPORT_SRS*/
7156 } /* EITEM_* switch */
7159 DEBUG(D_expand) /* only if not the sole expansion of the line */
7160 if (yield && (expansion_start > 0 || *s))
7161 debug_expansion_interim(US"item-res",
7162 yield->s + expansion_start, yield->ptr - expansion_start,
7169 /* Control reaches here if the name is not recognized as one of the more
7170 complicated expansion items. Check for the "operator" syntax (name terminated
7171 by a colon). Some of the operators have arguments, separated by _ from the
7177 uschar * arg = NULL, * sub;
7179 var_entry * vp = NULL;
7182 /* Owing to an historical mis-design, an underscore may be part of the
7183 operator name, or it may introduce arguments. We therefore first scan the
7184 table of names that contain underscores. If there is no match, we cut off
7185 the arguments and then scan the main table. */
7187 if ((c = chop_match(name, op_table_underscore,
7188 nelem(op_table_underscore))) < 0)
7190 if ((arg = Ustrchr(name, '_')))
7192 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7193 c += nelem(op_table_underscore);
7194 if (arg) *arg++ = '_'; /* Put back for error messages */
7197 /* Deal specially with operators that might take a certificate variable
7198 as we do not want to do the usual expansion. For most, expand the string.*/
7209 const uschar * s1 = s;
7210 sub = expand_string_internal(s+2,
7211 ESI_BRACE_ENDS | flags & ESI_SKIPPING, &s1, &resetok, NULL);
7212 if (!sub) goto EXPAND_FAILED; /*{*/
7215 expand_string_message =
7216 string_sprintf("missing '}' closing cert arg of %s", name);
7217 goto EXPAND_FAILED_CURLY;
7219 if ( (vp = find_var_ent(sub, var_table, nelem(var_table)))
7220 && vp->type == vtype_cert)
7230 sub = expand_string_internal(s+1,
7231 ESI_BRACE_ENDS | ESI_HONOR_DOLLAR | flags, &s, &resetok, NULL);
7232 if (!sub) goto EXPAND_FAILED;
7237 /* If we are skipping, we don't need to perform the operation at all.
7238 This matters for operations like "mask", because the data may not be
7239 in the correct format when skipping. For example, the expression may test
7240 for the existence of $sender_host_address before trying to mask it. For
7241 other operations, doing them may not fail, but it is a waste of time. */
7243 if (flags & ESI_SKIPPING && c >= 0) continue;
7245 /* Otherwise, switch on the operator type. After handling go back
7246 to the main loop top. */
7249 unsigned expansion_start = gstring_length(yield);
7255 unsigned long int n = Ustrtoul(sub, &t, 10);
7260 expand_string_message = string_sprintf("argument for base32 "
7261 "operator is \"%s\", which is not a decimal number", sub);
7265 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7267 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7274 unsigned long int n = 0;
7277 uschar * t = Ustrchr(base32_chars, *tt++);
7280 expand_string_message = string_sprintf("argument for base32d "
7281 "operator is \"%s\", which is not a base 32 number", sub);
7284 n = n * 32 + (t - base32_chars);
7286 yield = string_fmt_append(yield, "%ld", n);
7293 unsigned long int n = Ustrtoul(sub, &t, 10);
7296 expand_string_message = string_sprintf("argument for base62 "
7297 "operator is \"%s\", which is not a decimal number", sub);
7300 yield = string_cat(yield, string_base62_32(n)); /*XXX only handles 32b input range. Need variants? */
7304 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7309 unsigned long int n = 0;
7312 uschar *t = Ustrchr(base62_chars, *tt++);
7315 expand_string_message = string_sprintf("argument for base62d "
7316 "operator is \"%s\", which is not a base %d number", sub,
7320 n = n * BASE_62 + (t - base62_chars);
7322 yield = string_fmt_append(yield, "%ld", n);
7328 uschar *expanded = expand_string_internal(sub,
7329 ESI_HONOR_DOLLAR | flags & ESI_SKIPPING, NULL, &resetok, NULL);
7332 expand_string_message =
7333 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7334 expand_string_message);
7337 yield = string_cat(yield, expanded);
7343 uschar * t = sub - 1;
7344 while (*++t) *t = tolower(*t);
7345 yield = string_catn(yield, sub, t-sub);
7351 uschar * t = sub - 1;
7352 while (*++t) *t = toupper(*t);
7353 yield = string_catn(yield, sub, t-sub);
7359 if (vp && *(void **)vp->value)
7361 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7362 yield = string_cat(yield, cp);
7370 md5_end(&base, sub, Ustrlen(sub), digest);
7371 for (int j = 0; j < 16; j++)
7372 yield = string_fmt_append(yield, "%02x", digest[j]);
7378 if (vp && *(void **)vp->value)
7380 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7381 yield = string_cat(yield, cp);
7389 sha1_end(&h, sub, Ustrlen(sub), digest);
7390 for (int j = 0; j < 20; j++)
7391 yield = string_fmt_append(yield, "%02X", digest[j]);
7397 #ifdef EXIM_HAVE_SHA2
7398 if (vp && *(void **)vp->value)
7399 if (c == EOP_SHA256)
7400 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7402 expand_string_message = US"sha2_N not supported with certificates";
7407 hashmethod m = !arg ? HASH_SHA2_256
7408 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7409 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7410 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7413 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7415 expand_string_message = US"unrecognised sha2 variant";
7419 exim_sha_update_string(&h, sub);
7420 exim_sha_finish(&h, &b);
7422 yield = string_fmt_append(yield, "%02X", *b.data++);
7425 expand_string_message = US"sha256 only supported with TLS";
7430 #ifdef EXIM_HAVE_SHA3
7434 hashmethod m = !arg ? HASH_SHA3_256
7435 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7436 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7437 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7438 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7441 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7443 expand_string_message = US"unrecognised sha3 variant";
7447 exim_sha_update_string(&h, sub);
7448 exim_sha_finish(&h, &b);
7450 yield = string_fmt_append(yield, "%02X", *b.data++);
7454 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7458 /* Line-wrap a string as if it is a header line */
7460 case EOP_HEADERWRAP:
7462 unsigned col = 80, lim = 998;
7467 const uschar * list = arg;
7469 if ((s = string_nextinlist(&list, &sep, NULL, 0)))
7472 if ((s = string_nextinlist(&list, &sep, NULL, 0)))
7476 if ((s = wrap_header(sub, col, lim, US"\t", 8)))
7477 yield = string_cat(yield, s);
7481 /* Convert hex encoding to base64 encoding */
7491 for (enc = sub; *enc; enc++)
7493 if (!isxdigit(*enc))
7495 expand_string_message = string_sprintf("\"%s\" is not a hex "
7504 expand_string_message = string_sprintf("\"%s\" contains an odd "
7505 "number of characters", sub);
7509 while ((c = *in++) != 0)
7511 if (isdigit(c)) c -= '0';
7512 else c = toupper(c) - 'A' + 10;
7522 enc = b64encode(CUS sub, out - sub);
7523 yield = string_cat(yield, enc);
7527 /* Convert octets outside 0x21..0x7E to \xXX form */
7531 uschar *t = sub - 1;
7534 if (*t < 0x21 || 0x7E < *t)
7535 yield = string_fmt_append(yield, "\\x%02x", *t);
7537 yield = string_catn(yield, t, 1);
7542 /* count the number of list elements */
7546 int cnt = 0, sep = 0;
7547 uschar * buf = store_get(2, sub);
7549 while (string_nextinlist(CUSS &sub, &sep, buf, 1)) cnt++;
7550 yield = string_fmt_append(yield, "%d", cnt);
7554 /* expand a named list given the name */
7555 /* handles nested named lists; requotes as colon-sep list */
7558 expand_string_message = NULL;
7559 yield = expand_listnamed(yield, sub, arg);
7560 if (expand_string_message)
7564 /* quote a list-item for the given list-separator */
7566 /* mask applies a mask to an IP address; for example the result of
7567 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7574 int type, mask, maskoffset;
7578 if ((type = string_is_ip_address(sub, &maskoffset)) == 0)
7580 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7585 if (maskoffset == 0)
7587 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7592 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7594 if (*endptr || mask < 0 || mask > (type == 4 ? 32 : 128))
7596 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7601 /* If an optional 'n' was given, ipv6 gets normalised output:
7602 colons rather than dots, and zero-compressed. */
7604 normalised = arg && *arg == 'n';
7606 /* Convert the address to binary integer(s) and apply the mask */
7608 sub[maskoffset] = 0;
7609 count = host_aton(sub, binary);
7610 host_mask(count, binary, mask);
7612 /* Convert to masked textual format and add to output. */
7614 if (type == 4 || !normalised)
7615 yield = string_catn(yield, buffer,
7616 host_nmtoa(count, binary, mask, buffer, '.'));
7619 ipv6_nmtoa(binary, buffer);
7620 yield = string_fmt_append(yield, "%s/%d", buffer, mask);
7626 case EOP_IPV6DENORM:
7628 int type = string_is_ip_address(sub, NULL);
7635 (void) host_aton(sub, binary);
7638 case 4: /* convert to IPv4-mapped IPv6 */
7639 binary[0] = binary[1] = 0;
7640 binary[2] = 0x0000ffff;
7641 (void) host_aton(sub, binary+3);
7645 expand_string_message =
7646 string_sprintf("\"%s\" is not an IP address", sub);
7650 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7651 ? ipv6_nmtoa(binary, buffer)
7652 : host_nmtoa(4, binary, -1, buffer, ':')
7658 case EOP_LOCAL_PART:
7662 int start, end, domain;
7663 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7666 if (c != EOP_DOMAIN)
7667 yield = c == EOP_LOCAL_PART && domain > 0
7668 ? string_catn(yield, t, domain - 1)
7669 : string_cat(yield, t);
7670 else if (domain > 0)
7671 yield = string_cat(yield, t + domain);
7677 uschar outsep[2] = { ':', '\0' };
7678 uschar *address, *error;
7679 int save_ptr = gstring_length(yield);
7680 int start, end, domain; /* Not really used */
7682 if (Uskip_whitespace(&sub) == '>')
7683 if (*outsep = *++sub) ++sub;
7686 expand_string_message = string_sprintf("output separator "
7687 "missing in expanding ${addresses:%s}", --sub);
7690 f.parse_allow_group = TRUE;
7694 uschar * p = parse_find_address_end(sub, FALSE);
7695 uschar saveend = *p;
7697 address = parse_extract_address(sub, &error, &start, &end, &domain,
7701 /* Add the address to the output list that we are building. This is
7702 done in chunks by searching for the separator character. At the
7703 start, unless we are dealing with the first address of the output
7704 list, add in a space if the new address begins with the separator
7705 character, or is an empty string. */
7709 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7710 yield = string_catn(yield, US" ", 1);
7714 size_t seglen = Ustrcspn(address, outsep);
7715 yield = string_catn(yield, address, seglen + 1);
7717 /* If we got to the end of the string we output one character
7720 if (address[seglen] == '\0') { yield->ptr--; break; }
7721 yield = string_catn(yield, outsep, 1);
7722 address += seglen + 1;
7725 /* Output a separator after the string: we will remove the
7726 redundant final one at the end. */
7728 yield = string_catn(yield, outsep, 1);
7731 if (saveend == '\0') break;
7735 /* If we have generated anything, remove the redundant final
7738 if (yield && yield->ptr != save_ptr) yield->ptr--;
7739 f.parse_allow_group = FALSE;
7744 /* quote puts a string in quotes if it is empty or contains anything
7745 other than alphamerics, underscore, dot, or hyphen.
7747 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7748 be quoted in order to be a valid local part.
7750 In both cases, newlines and carriage returns are converted into \n and \r
7754 case EOP_QUOTE_LOCAL_PART:
7757 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7758 uschar *t = sub - 1;
7761 while (!needs_quote && *++t)
7762 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7764 else /* EOP_QUOTE_LOCAL_PART */
7765 while (!needs_quote && *++t)
7766 needs_quote = !isalnum(*t)
7767 && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL
7768 && (*t != '.' || t == sub || !t[1]);
7772 yield = string_catn(yield, US"\"", 1);
7776 yield = string_catn(yield, US"\\n", 2);
7777 else if (*t == '\r')
7778 yield = string_catn(yield, US"\\r", 2);
7781 if (*t == '\\' || *t == '"')
7782 yield = string_catn(yield, US"\\", 1);
7783 yield = string_catn(yield, t, 1);
7785 yield = string_catn(yield, US"\"", 1);
7788 yield = string_cat(yield, sub);
7791 /* quote_lookuptype does lookup-specific quoting */
7795 const lookup_info * li;
7796 uschar * opt = Ustrchr(arg, '_');
7798 if (opt) *opt++ = 0;
7800 if (!(li = search_findtype(arg, Ustrlen(arg))))
7802 expand_string_message = search_error_message;
7807 sub = (li->quote)(sub, opt, li->acq_num);
7813 expand_string_message = string_sprintf(
7814 "\"%s\" unrecognized after \"${quote_%s\"", /*}*/
7819 yield = string_cat(yield, sub);
7823 /* rx quote sticks in \ before any non-alphameric character so that
7824 the insertion works in a regular expression. */
7828 uschar *t = sub - 1;
7832 yield = string_catn(yield, US"\\", 1);
7833 yield = string_catn(yield, t, 1);
7838 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7839 prescribed by the RFC, if there are characters that need to be encoded */
7842 yield = string_cat(yield,
7843 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7847 /* RFC 2047 decode */
7853 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7854 headers_charset, '?', &len, &error);
7857 expand_string_message = error;
7860 yield = string_catn(yield, decoded, len);
7864 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7869 uschar * buff = store_get(4, sub);
7874 if (c > 255) c = '_';
7876 yield = string_catn(yield, buff, 1);
7881 /* replace illegal UTF-8 sequences by replacement character */
7883 #define UTF8_REPLACEMENT_CHAR US"?"
7887 int seq_len = 0, index = 0, bytes_left = 0, complete;
7888 u_long codepoint = (u_long)-1;
7889 uschar seq_buff[4]; /* accumulate utf-8 here */
7891 /* Manually track tainting, as we deal in individual chars below */
7894 yield = string_get_tainted(Ustrlen(sub), sub);
7895 else if (!yield->s || !yield->ptr)
7897 yield->s = store_get(yield->size = Ustrlen(sub), sub);
7898 gstring_reset(yield);
7900 else if (is_incompatible(yield->s, sub))
7901 gstring_rebuffer(yield, sub);
7903 /* Check the UTF-8, byte-by-byte */
7912 if ((c & 0xc0) != 0x80)
7913 /* wrong continuation byte; invalidate all bytes */
7914 complete = 1; /* error */
7917 codepoint = (codepoint << 6) | (c & 0x3f);
7918 seq_buff[index++] = c;
7919 if (--bytes_left == 0) /* codepoint complete */
7920 if(codepoint > 0x10FFFF) /* is it too large? */
7921 complete = -1; /* error (RFC3629 limit) */
7922 else if ( (codepoint & 0x1FF800 ) == 0xD800 ) /* surrogate */
7923 /* A UTF-16 surrogate (which should be one of a pair that
7924 encode a Unicode codepoint that is outside the Basic
7925 Multilingual Plane). Error, not UTF8.
7926 RFC2279.2 is slightly unclear on this, but
7927 https://unicodebook.readthedocs.io/issues.html#strict-utf8-decoder
7928 says "Surrogates characters are also invalid in UTF-8:
7929 characters in U+D800—U+DFFF have to be rejected." */
7932 { /* finished; output utf-8 sequence */
7933 yield = string_catn(yield, seq_buff, seq_len);
7938 else /* no bytes left: new sequence */
7940 if (!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7942 yield = string_catn(yield, &c, 1);
7945 if ((c & 0xe0) == 0xc0) /* 2-byte sequence */
7946 if (c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7951 codepoint = c & 0x1f;
7953 else if ((c & 0xf0) == 0xe0) /* 3-byte sequence */
7956 codepoint = c & 0x0f;
7958 else if ((c & 0xf8) == 0xf0) /* 4-byte sequence */
7961 codepoint = c & 0x07;
7963 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7966 seq_buff[index++] = c;
7967 seq_len = bytes_left + 1;
7968 } /* if(bytes_left) */
7972 bytes_left = index = 0;
7973 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7975 if ((complete == 1) && ((c & 0x80) == 0))
7976 /* ASCII character follows incomplete sequence */
7977 yield = string_catn(yield, &c, 1);
7979 /* If given a sequence truncated mid-character, we also want to report ?
7980 Eg, ${length_1:フィル} is one byte, not one character, so we expect
7981 ${utf8clean:${length_1:フィル}} to yield '?' */
7983 if (bytes_left != 0)
7984 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7990 case EOP_UTF8_DOMAIN_TO_ALABEL:
7992 uschar * error = NULL;
7993 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7996 expand_string_message = string_sprintf(
7997 "error converting utf8 (%s) to alabel: %s",
7998 string_printing(sub), error);
8001 yield = string_cat(yield, s);
8005 case EOP_UTF8_DOMAIN_FROM_ALABEL:
8007 uschar * error = NULL;
8008 uschar * s = string_domain_alabel_to_utf8(sub, &error);
8011 expand_string_message = string_sprintf(
8012 "error converting alabel (%s) to utf8: %s",
8013 string_printing(sub), error);
8016 yield = string_cat(yield, s);
8020 case EOP_UTF8_LOCALPART_TO_ALABEL:
8022 uschar * error = NULL;
8023 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
8026 expand_string_message = string_sprintf(
8027 "error converting utf8 (%s) to alabel: %s",
8028 string_printing(sub), error);
8031 yield = string_cat(yield, s);
8032 DEBUG(D_expand) debug_printf_indent("yield: '%Y'\n", yield);
8036 case EOP_UTF8_LOCALPART_FROM_ALABEL:
8038 uschar * error = NULL;
8039 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
8042 expand_string_message = string_sprintf(
8043 "error converting alabel (%s) to utf8: %s",
8044 string_printing(sub), error);
8047 yield = string_cat(yield, s);
8050 #endif /* EXPERIMENTAL_INTERNATIONAL */
8052 /* escape turns all non-printing characters into escape sequences. */
8056 const uschar * t = string_printing(sub);
8057 yield = string_cat(yield, t);
8061 case EOP_ESCAPE8BIT:
8065 for (const uschar * s = sub; (c = *s); s++)
8066 yield = c < 127 && c != '\\'
8067 ? string_catn(yield, s, 1)
8068 : string_fmt_append(yield, "\\%03o", c);
8072 /* Handle numeric expression evaluation */
8077 uschar *save_sub = sub;
8078 uschar *error = NULL;
8079 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
8082 expand_string_message = string_sprintf("error in expression "
8083 "evaluation: %s (after processing \"%.*s\")", error,
8084 (int)(sub-save_sub), save_sub);
8087 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
8091 /* Handle time period formatting */
8095 int n = readconf_readtime(sub, 0, FALSE);
8098 expand_string_message = string_sprintf("string \"%s\" is not an "
8099 "Exim time interval in \"%s\" operator", sub, name);
8102 yield = string_fmt_append(yield, "%d", n);
8106 case EOP_TIME_INTERVAL:
8109 uschar *t = read_number(&n, sub);
8110 if (*t != 0) /* Not A Number*/
8112 expand_string_message = string_sprintf("string \"%s\" is not a "
8113 "positive number in \"%s\" operator", sub, name);
8116 t = readconf_printtime(n);
8117 yield = string_cat(yield, t);
8121 /* Convert string to base64 encoding */
8127 uschar * s = vp && *(void **)vp->value
8128 ? tls_cert_der_b64(*(void **)vp->value)
8129 : b64encode(CUS sub, Ustrlen(sub));
8131 uschar * s = b64encode(CUS sub, Ustrlen(sub));
8133 yield = string_cat(yield, s);
8140 int len = b64decode(sub, &s, sub);
8143 expand_string_message = string_sprintf("string \"%s\" is not "
8144 "well-formed for \"%s\" operator", sub, name);
8147 yield = string_cat(yield, s);
8151 /* strlen returns the length of the string */
8154 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
8157 /* length_n or l_n takes just the first n characters or the whole string,
8158 whichever is the shorter;
8160 substr_m_n, and s_m_n take n characters from offset m; negative m take
8161 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
8162 takes the rest, either to the right or to the left.
8164 hash_n or h_n makes a hash of length n from the string, yielding n
8165 characters from the set a-z; hash_n_m makes a hash of length n, but
8166 uses m characters from the set a-zA-Z0-9.
8168 nhash_n returns a single number between 0 and n-1 (in text form), while
8169 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
8170 between 0 and n-1 and the second between 0 and m-1. */
8190 expand_string_message = string_sprintf("missing values after %s",
8195 /* "length" has only one argument, effectively being synonymous with
8198 if (c == EOP_LENGTH || c == EOP_L)
8204 /* The others have one or two arguments; for "substr" the first may be
8205 negative. The second being negative means "not supplied". */
8210 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8213 /* Read up to two numbers, separated by underscores */
8218 if (arg != ret && *arg == '_' && pn == &value1)
8222 if (arg[1] != 0) arg++;
8224 else if (!isdigit(*arg))
8226 expand_string_message =
8227 string_sprintf("non-digit after underscore in \"%s\"", name);
8230 else *pn = (*pn)*10 + *arg++ - '0';
8234 /* Perform the required operation */
8236 ret = c == EOP_HASH || c == EOP_H
8237 ? compute_hash(sub, value1, value2, &len)
8238 : c == EOP_NHASH || c == EOP_NH
8239 ? compute_nhash(sub, value1, value2, &len)
8240 : extract_substr(sub, value1, value2, &len);
8241 if (!ret) goto EXPAND_FAILED;
8243 yield = string_catn(yield, ret, len);
8252 uschar **modetable[3];
8256 if (expand_forbid & RDO_EXISTS)
8258 expand_string_message = US"Use of the stat() expansion is not permitted";
8262 if (stat(CS sub, &st) < 0)
8264 expand_string_message = string_sprintf("stat(%s) failed: %s",
8265 sub, strerror(errno));
8269 switch (mode & S_IFMT)
8271 case S_IFIFO: smode[0] = 'p'; break;
8272 case S_IFCHR: smode[0] = 'c'; break;
8273 case S_IFDIR: smode[0] = 'd'; break;
8274 case S_IFBLK: smode[0] = 'b'; break;
8275 case S_IFREG: smode[0] = '-'; break;
8276 default: smode[0] = '?'; break;
8279 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8280 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8281 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8283 for (int i = 0; i < 3; i++)
8285 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8290 yield = string_fmt_append(yield,
8291 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8292 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8293 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8294 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8295 (long)st.st_gid, st.st_size, (long)st.st_atime,
8296 (long)st.st_mtime, (long)st.st_ctime);
8300 /* vaguely random number less than N */
8304 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8306 if (expand_string_message)
8308 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8312 /* Reverse IP, including IPv6 to dotted-nibble */
8314 case EOP_REVERSE_IP:
8316 int family, maskptr;
8317 uschar reversed[128];
8319 family = string_is_ip_address(sub, &maskptr);
8322 expand_string_message = string_sprintf(
8323 "reverse_ip() not given an IP address [%s]", sub);
8326 invert_address(reversed, sub);
8327 yield = string_cat(yield, reversed);
8334 int len = xtextdecode(sub, &s);
8335 yield = string_catn(yield, s, len);
8339 /* Unknown operator */
8341 expand_string_message =
8342 string_sprintf("unknown expansion operator \"%s\"", name);
8344 } /* EOP_* switch */
8348 const uschar * res = string_from_gstring(yield);
8349 const uschar * s = res + expansion_start;
8350 int i = gstring_length(yield) - expansion_start;
8351 BOOL tainted = is_tainted(s);
8353 debug_printf_indent("%Vop-res: %.*s\n", "K-----", i, s);
8356 debug_printf_indent("%V %V",
8357 flags & ESI_SKIPPING ? "|" : " ",
8359 debug_print_taint(res);
8366 /* Not an item or an operator */
8367 /* Handle a plain name. If this is the first thing in the expansion, release
8368 the pre-allocated buffer. If the result data is known to be in a new buffer,
8369 newsize will be set to the size of that buffer, and we can just point at that
8370 store instead of copying. Many expansion strings contain just one reference,
8371 so this is a useful optimization, especially for humungous headers
8372 ($message_headers). */
8376 const uschar * value;
8382 g = store_get(sizeof(gstring), GET_UNTAINTED);
8383 else if (yield->ptr == 0)
8385 if (resetok) reset_point = store_reset(reset_point);
8387 reset_point = store_mark();
8388 g = store_get(sizeof(gstring), GET_UNTAINTED); /* alloc _before_ calling find_variable() */
8390 if (!(value = find_variable(name, flags, &newsize)))
8392 expand_string_message =
8393 string_sprintf("unknown variable in \"${%s}\"", name);
8394 check_variable_error_message(name);
8397 len = Ustrlen(value);
8398 if (!yield && newsize)
8401 yield->size = newsize;
8403 yield->s = US value; /* known to be in new store i.e. a copy, so deconst safe */
8406 yield = string_catn(yield, value, len);
8410 /* Else there's something wrong */
8412 expand_string_message =
8413 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8414 "in a variable reference)", name);
8418 /* If we hit the end of the string when brace_ends is set, there is a missing
8419 terminating brace. */
8421 if (flags & ESI_BRACE_ENDS && !*s)
8423 expand_string_message = malformed_header
8424 ? US"missing } at end of string - could be header name not terminated by colon"
8425 : US"missing } at end of string";
8429 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8430 added to the string. If so, set up an empty string. Add a terminating zero. If
8431 left != NULL, return a pointer to the terminator. */
8437 yield = string_get(1);
8438 res = string_from_gstring(yield);
8439 if (left) *left = s;
8441 /* Any stacking store that was used above the final string is no longer needed.
8442 In many cases the final string will be the first one that was got and so there
8443 will be optimal store usage. */
8445 if (resetok) gstring_release_unused(yield);
8446 else if (resetok_p) *resetok_p = FALSE;
8450 BOOL tainted = is_tainted(res);
8451 debug_printf_indent("%Vexpanded: %.*W\n",
8453 (int)(s - string), string);
8454 debug_printf_indent("%Vresult: ",
8455 flags & ESI_SKIPPING ? "K-----" : "\\_____");
8456 if (*res || !(flags & ESI_SKIPPING))
8457 debug_printf("%W\n", res);
8459 debug_printf(" %Vskipped%V\n", "<", ">");
8462 debug_printf_indent("%V %V",
8463 flags & ESI_SKIPPING ? "|" : " ",
8466 debug_print_taint(res);
8468 if (flags & ESI_SKIPPING)
8469 debug_printf_indent("%Vskipping: result is not used\n", "\\___");
8471 if (textonly_p) *textonly_p = textonly;
8476 /* This is the failure exit: easiest to program with a goto. We still need
8477 to update the pointer to the terminator, for cases of nested calls with "fail".
8480 EXPAND_FAILED_CURLY:
8481 if (malformed_header)
8482 expand_string_message =
8483 US"missing or misplaced { or } - could be header name not terminated by colon";
8485 else if (!expand_string_message || !*expand_string_message)
8486 expand_string_message = US"missing or misplaced { or }";
8488 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8489 that is a bad idea, because expand_string_message is in dynamic store. */
8492 if (left) *left = s;
8495 debug_printf_indent("%Vfailed to expand: %s\n", "K", string);
8496 debug_printf_indent("%Verror message: %s\n",
8497 f.expand_string_forcedfail ? "K---" : "\\___", expand_string_message);
8498 if (f.expand_string_forcedfail)
8499 debug_printf_indent("%Vfailure was forced\n", "\\");
8501 if (resetok_p && !resetok) *resetok_p = FALSE;
8508 /* This is the external function call. Do a quick check for any expansion
8509 metacharacters, and if there are none, just return the input string.
8512 the string to be expanded
8513 optional pointer for return boolean indicating no-dynamic-expansions
8515 Returns: the expanded string, or NULL if expansion failed; if failure was
8516 due to a lookup deferring, search_find_defer will be TRUE
8520 expand_string_2(const uschar * string, BOOL * textonly_p)
8522 f.expand_string_forcedfail = f.search_find_defer = malformed_header = FALSE;
8523 if (Ustrpbrk(string, "$\\") != NULL)
8525 int old_pool = store_pool;
8528 store_pool = POOL_MAIN;
8529 s = expand_string_internal(string, ESI_HONOR_DOLLAR, NULL, NULL, textonly_p);
8530 store_pool = old_pool;
8533 if (textonly_p) *textonly_p = TRUE;
8538 expand_cstring(const uschar * string)
8539 { return expand_string_2(string, NULL); }
8542 expand_string(uschar * string)
8543 { return US expand_string_2(CUS string, NULL); }
8550 /*************************************************
8552 *************************************************/
8554 /* Now and again we want to expand a string and be sure that the result is in a
8555 new bit of store. This function does that.
8556 Since we know it has been copied, the de-const cast is safe.
8558 Argument: the string to be expanded
8559 Returns: the expanded string, always in a new bit of store, or NULL
8563 expand_string_copy(const uschar *string)
8565 const uschar *yield = expand_cstring(string);
8566 if (yield == string) yield = string_copy(string);
8572 /*************************************************
8573 * Expand and interpret as an integer *
8574 *************************************************/
8576 /* Expand a string, and convert the result into an integer.
8579 string the string to be expanded
8580 isplus TRUE if a non-negative number is expected
8582 Returns: the integer value, or
8583 -1 for an expansion error ) in both cases, message in
8584 -2 for an integer interpretation error ) expand_string_message
8585 expand_string_message is set NULL for an OK integer
8589 expand_string_integer(uschar *string, BOOL isplus)
8591 return expanded_string_integer(expand_string(string), isplus);
8595 /*************************************************
8596 * Interpret string as an integer *
8597 *************************************************/
8599 /* Convert a string (that has already been expanded) into an integer.
8601 This function is used inside the expansion code.
8604 s the string to be expanded
8605 isplus TRUE if a non-negative number is expected
8607 Returns: the integer value, or
8608 -1 if string is NULL (which implies an expansion error)
8609 -2 for an integer interpretation error
8610 expand_string_message is set NULL for an OK integer
8613 static int_eximarith_t
8614 expanded_string_integer(const uschar *s, BOOL isplus)
8616 int_eximarith_t value;
8617 uschar *msg = US"invalid integer \"%s\"";
8620 /* If expansion failed, expand_string_message will be set. */
8624 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8625 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8626 systems, so we set it zero ourselves. */
8629 expand_string_message = NULL; /* Indicates no error */
8631 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8632 equal to 0. Unfortunately, people actually relied upon that, so preserve
8633 the behaviour explicitly. Stripping leading whitespace is a harmless
8634 noop change since strtol skips it anyway (provided that there is a number
8637 if (Uskip_whitespace(&s) == '\0')
8640 debug_printf_indent("treating blank string as number 0\n");
8644 value = strtoll(CS s, CSS &endptr, 10);
8647 msg = US"integer expected but \"%s\" found";
8648 else if (value < 0 && isplus)
8649 msg = US"non-negative integer expected but \"%s\" found";
8652 switch (tolower(*endptr))
8657 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8662 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8663 else value *= 1024*1024;
8667 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8668 else value *= 1024*1024*1024;
8672 if (errno == ERANGE)
8673 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8675 if (Uskip_whitespace(&endptr) == 0) return value;
8678 expand_string_message = string_sprintf(CS msg, s);
8683 /* These values are usually fixed boolean values, but they are permitted to be
8687 addr address being routed
8688 mtype the module type
8689 mname the module name
8690 dbg_opt debug selectors
8691 oname the option name
8692 bvalue the router's boolean value
8693 svalue the router's string value
8694 rvalue where to put the returned value
8696 Returns: OK value placed in rvalue
8697 DEFER expansion failed
8701 exp_bool(address_item * addr,
8702 const uschar * mtype, const uschar * mname, unsigned dbg_opt,
8703 uschar * oname, BOOL bvalue,
8704 const uschar * svalue, BOOL * rvalue)
8706 const uschar * expanded;
8708 DEBUG(D_expand) debug_printf("try option %s\n", oname);
8709 if (!svalue) { *rvalue = bvalue; return OK; }
8711 if (!(expanded = expand_cstring(svalue)))
8713 if (f.expand_string_forcedfail)
8715 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8719 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8720 oname, mname, mtype, expand_string_message);
8721 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8725 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8728 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8730 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8734 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8735 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8744 /* Avoid potentially exposing a password in a string about to be logged */
8747 expand_hide_passwords(uschar * s)
8749 return ( ( Ustrstr(s, "failed to expand") != NULL
8750 || Ustrstr(s, "expansion of ") != NULL
8752 && ( Ustrstr(s, "mysql") != NULL
8753 || Ustrstr(s, "pgsql") != NULL
8754 || Ustrstr(s, "redis") != NULL
8755 || Ustrstr(s, "sqlite") != NULL
8756 || Ustrstr(s, "ldap:") != NULL
8757 || Ustrstr(s, "ldaps:") != NULL
8758 || Ustrstr(s, "ldapi:") != NULL
8759 || Ustrstr(s, "ldapdn:") != NULL
8760 || Ustrstr(s, "ldapm:") != NULL
8762 ? US"Temporary internal error" : s;
8766 /* Read given named file into big_buffer. Use for keying material etc.
8767 The content will have an ascii NUL appended.
8772 Return: pointer to buffer, or NULL on error.
8776 expand_file_big_buffer(const uschar * filename)
8778 int fd, off = 0, len;
8780 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8782 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8789 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8792 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8800 big_buffer[off] = '\0';
8806 /*************************************************
8807 * Error-checking for testsuite *
8808 *************************************************/
8810 uschar * region_start;
8811 uschar * region_end;
8812 const uschar *var_name;
8813 const uschar *var_data;
8816 /* Called via tree_walk, which allows nonconst name/data. Our usage is const. */
8818 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8821 if (var_data >= e->region_start && var_data < e->region_end)
8823 e->var_name = CUS var_name;
8824 e->var_data = CUS var_data;
8829 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8831 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8832 .var_name = NULL, .var_data = NULL };
8834 /* check acl_ variables */
8835 tree_walk(acl_var_c, assert_variable_notin, &e);
8836 tree_walk(acl_var_m, assert_variable_notin, &e);
8838 /* check auth<n> variables.
8839 assert_variable_notin() treats as const, so deconst is safe. */
8840 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8841 assert_variable_notin(US"auth<n>", US auth_vars[i], &e);
8843 #ifdef WITH_CONTENT_SCAN
8844 /* check regex<n> variables. assert_variable_notin() treats as const. */
8845 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8846 assert_variable_notin(US"regex<n>", US regex_vars[i], &e);
8849 /* check known-name variables */
8850 for (var_entry * v = var_table; v < var_table + nelem(var_table); v++)
8851 if (v->type == vtype_stringptr)
8852 assert_variable_notin(US v->name, *(USS v->value), &e);
8854 /* check dns and address trees */
8855 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8856 tree_walk(tree_duplicates, assert_variable_notin, &e);
8857 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8858 tree_walk(tree_unusable, assert_variable_notin, &e);
8861 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8862 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8863 e.var_name, filename, linenumber, e.var_data);
8868 /*************************************************
8869 **************************************************
8870 * Stand-alone test program *
8871 **************************************************
8872 *************************************************/
8878 regex_match_and_setup(const pcre2_code *re, uschar *subject, int options, int setup)
8880 int ovec[3*(EXPAND_MAXN+1)];
8881 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8883 BOOL yield = n >= 0;
8884 if (n == 0) n = EXPAND_MAXN + 1;
8887 expand_nmax = setup < 0 ? 0 : setup + 1;
8888 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8890 expand_nstring[expand_nmax] = subject + ovec[nn];
8891 expand_nlength[expand_nmax++] = ovec[nn+1] - ovec[nn];
8899 int main(int argc, uschar **argv)
8901 uschar buffer[1024];
8903 debug_selector = D_v;
8904 debug_file = stderr;
8905 debug_fd = fileno(debug_file);
8906 big_buffer = malloc(big_buffer_size);
8909 for (int i = 1; i < argc; i++)
8911 if (argv[i][0] == '+')
8913 debug_trace_memory = 2;
8916 if (isdigit(argv[i][0]))
8917 debug_selector = Ustrtol(argv[i], NULL, 0);
8919 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8923 eldap_default_servers = argv[i];
8926 mysql_servers = argv[i];
8929 pgsql_servers = argv[i];
8932 redis_servers = argv[i];
8936 else opt_perl_startup = argv[i];
8940 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8942 expand_nstring[1] = US"string 1....";
8943 expand_nlength[1] = 8;
8947 if (opt_perl_startup != NULL)
8950 printf("Starting Perl interpreter\n");
8951 errstr = init_perl(opt_perl_startup);
8954 printf("** error in perl_startup code: %s\n", errstr);
8955 return EXIT_FAILURE;
8958 #endif /* EXIM_PERL */
8960 /* Thie deliberately regards the input as untainted, so that it can be
8961 expanded; only reasonable since this is a test for string-expansions. */
8963 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8965 rmark reset_point = store_mark();
8966 uschar *yield = expand_string(buffer);
8968 printf("%s\n", yield);
8971 if (f.search_find_defer) printf("search_find deferred\n");
8972 printf("Failed: %s\n", expand_string_message);
8973 if (f.expand_string_forcedfail) printf("Forced failure\n");
8976 store_reset(reset_point);
8984 #endif /*STAND_ALONE*/
8986 #endif /*!MACRO_PREDEF*/
8989 /* End of expand.c */