1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* Functions for handling string expansion. */
14 /* Recursively called function */
16 static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *);
17 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
20 # ifndef SUPPORT_CRYPTEQ
21 # define SUPPORT_CRYPTEQ
26 # include "lookups/ldap.h"
29 #ifdef SUPPORT_CRYPTEQ
34 extern char* crypt16(char*, char*);
38 /* The handling of crypt16() is a mess. I will record below the analysis of the
39 mess that was sent to me. We decided, however, to make changing this very low
40 priority, because in practice people are moving away from the crypt()
41 algorithms nowadays, so it doesn't seem worth it.
44 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
45 the first 8 characters of the password using a 20-round version of crypt
46 (standard crypt does 25 rounds). It then crypts the next 8 characters,
47 or an empty block if the password is less than 9 characters, using a
48 20-round version of crypt and the same salt as was used for the first
49 block. Characters after the first 16 are ignored. It always generates
50 a 16-byte hash, which is expressed together with the salt as a string
51 of 24 base 64 digits. Here are some links to peruse:
53 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
54 http://seclists.org/bugtraq/1999/Mar/0076.html
56 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
57 and OSF/1. This is the same as the standard crypt if given a password
58 of 8 characters or less. If given more, it first does the same as crypt
59 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
60 using as salt the first two base 64 digits from the first hash block.
61 If the password is more than 16 characters then it crypts the 17th to 24th
62 characters using as salt the first two base 64 digits from the second hash
63 block. And so on: I've seen references to it cutting off the password at
64 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
66 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
67 http://seclists.org/bugtraq/1999/Mar/0109.html
68 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
69 TET1_html/sec.c222.html#no_id_208
71 Exim has something it calls "crypt16". It will either use a native
72 crypt16 or its own implementation. A native crypt16 will presumably
73 be the one that I called "crypt16" above. The internal "crypt16"
74 function, however, is a two-block-maximum implementation of what I called
75 "bigcrypt". The documentation matches the internal code.
77 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
78 that crypt16 and bigcrypt were different things.
80 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
81 to whatever it is using under that name. This unfortunately sets a
82 precedent for using "{crypt16}" to identify two incompatible algorithms
83 whose output can't be distinguished. With "{crypt16}" thus rendered
84 ambiguous, I suggest you deprecate it and invent two new identifiers
85 for the two algorithms.
87 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
88 of the password separately means they can be cracked separately, so
89 the double-length hash only doubles the cracking effort instead of
90 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
97 /*************************************************
98 * Local statics and tables *
99 *************************************************/
101 /* Table of item names, and corresponding switch numbers. The names must be in
102 alphabetical order. */
104 static uschar *item_table[] = {
166 /* Tables of operator names, and corresponding switch numbers. The names must be
167 in alphabetical order. There are two tables, because underscore is used in some
168 cases to introduce arguments, whereas for other it is part of the name. This is
169 an historical mis-design. */
171 static uschar *op_table_underscore[] = {
174 US"quote_local_part",
179 ,US"utf8_domain_from_alabel",
180 US"utf8_domain_to_alabel",
181 US"utf8_localpart_from_alabel",
182 US"utf8_localpart_to_alabel"
189 EOP_QUOTE_LOCAL_PART,
194 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
195 EOP_UTF8_DOMAIN_TO_ALABEL,
196 EOP_UTF8_LOCALPART_FROM_ALABEL,
197 EOP_UTF8_LOCALPART_TO_ALABEL
201 static uschar *op_table_main[] = {
248 EOP_ADDRESS = nelem(op_table_underscore),
294 /* Table of condition names, and corresponding switch numbers. The names must
295 be in alphabetical order. */
297 static uschar *cond_table[] = {
301 US"==", /* Backward compatibility */
334 US"match_local_part",
359 ECOND_FIRST_DELIVERY,
380 ECOND_MATCH_LOCAL_PART,
390 /* Types of table entry */
393 vtype_int, /* value is address of int */
394 vtype_filter_int, /* ditto, but recognized only when filtering */
395 vtype_ino, /* value is address of ino_t (not always an int) */
396 vtype_uid, /* value is address of uid_t (not always an int) */
397 vtype_gid, /* value is address of gid_t (not always an int) */
398 vtype_bool, /* value is address of bool */
399 vtype_stringptr, /* value is address of pointer to string */
400 vtype_msgbody, /* as stringptr, but read when first required */
401 vtype_msgbody_end, /* ditto, the end of the message */
402 vtype_msgheaders, /* the message's headers, processed */
403 vtype_msgheaders_raw, /* the message's headers, unprocessed */
404 vtype_localpart, /* extract local part from string */
405 vtype_domain, /* extract domain from string */
406 vtype_string_func, /* value is string returned by given function */
407 vtype_todbsdin, /* value not used; generate BSD inbox tod */
408 vtype_tode, /* value not used; generate tod in epoch format */
409 vtype_todel, /* value not used; generate tod in epoch/usec format */
410 vtype_todf, /* value not used; generate full tod */
411 vtype_todl, /* value not used; generate log tod */
412 vtype_todlf, /* value not used; generate log file datestamp tod */
413 vtype_todzone, /* value not used; generate time zone only */
414 vtype_todzulu, /* value not used; generate zulu tod */
415 vtype_reply, /* value not used; get reply from headers */
416 vtype_pid, /* value not used; result is pid */
417 vtype_host_lookup, /* value not used; get host name */
418 vtype_load_avg, /* value not used; result is int from os_getloadavg */
419 vtype_pspace, /* partition space; value is T/F for spool/log */
420 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
421 vtype_cert /* SSL certificate */
423 ,vtype_dkim /* Lookup of value in DKIM signature */
427 /* Type for main variable table */
435 /* Type for entries pointing to address/length pairs. Not currently
443 static uschar * fn_recipients(void);
445 /* This table must be kept in alphabetical order. */
447 static var_entry var_table[] = {
448 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
449 they will be confused with user-creatable ACL variables. */
450 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
451 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
452 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
453 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
454 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
455 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
456 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
457 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
458 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
459 { "acl_narg", vtype_int, &acl_narg },
460 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
461 { "address_data", vtype_stringptr, &deliver_address_data },
462 { "address_file", vtype_stringptr, &address_file },
463 { "address_pipe", vtype_stringptr, &address_pipe },
464 #ifdef EXPERIMENTAL_ARC
465 { "arc_state", vtype_stringptr, &arc_state },
466 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
468 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
469 { "authenticated_id", vtype_stringptr, &authenticated_id },
470 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
471 { "authentication_failed",vtype_int, &authentication_failed },
472 #ifdef WITH_CONTENT_SCAN
473 { "av_failed", vtype_int, &av_failed },
475 #ifdef EXPERIMENTAL_BRIGHTMAIL
476 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
477 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
478 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
479 { "bmi_deliver", vtype_int, &bmi_deliver },
481 { "body_linecount", vtype_int, &body_linecount },
482 { "body_zerocount", vtype_int, &body_zerocount },
483 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
484 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
485 { "caller_gid", vtype_gid, &real_gid },
486 { "caller_uid", vtype_uid, &real_uid },
487 { "callout_address", vtype_stringptr, &callout_address },
488 { "compile_date", vtype_stringptr, &version_date },
489 { "compile_number", vtype_stringptr, &version_cnumber },
490 { "config_dir", vtype_stringptr, &config_main_directory },
491 { "config_file", vtype_stringptr, &config_main_filename },
492 { "csa_status", vtype_stringptr, &csa_status },
493 #ifdef EXPERIMENTAL_DCC
494 { "dcc_header", vtype_stringptr, &dcc_header },
495 { "dcc_result", vtype_stringptr, &dcc_result },
498 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
499 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
500 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
501 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
502 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
503 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
504 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
505 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
506 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
507 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
508 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
509 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
510 { "dkim_key_length", vtype_int, &dkim_key_length },
511 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
512 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
513 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
514 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
515 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
516 { "dkim_signers", vtype_stringptr, &dkim_signers },
517 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
518 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
520 #ifdef EXPERIMENTAL_DMARC
521 { "dmarc_ar_header", vtype_stringptr, &dmarc_ar_header },
522 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
523 { "dmarc_status", vtype_stringptr, &dmarc_status },
524 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
525 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
527 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
528 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
529 { "dnslist_text", vtype_stringptr, &dnslist_text },
530 { "dnslist_value", vtype_stringptr, &dnslist_value },
531 { "domain", vtype_stringptr, &deliver_domain },
532 { "domain_data", vtype_stringptr, &deliver_domain_data },
533 #ifndef DISABLE_EVENT
534 { "event_data", vtype_stringptr, &event_data },
536 /*XXX want to use generic vars for as many of these as possible*/
537 { "event_defer_errno", vtype_int, &event_defer_errno },
539 { "event_name", vtype_stringptr, &event_name },
541 { "exim_gid", vtype_gid, &exim_gid },
542 { "exim_path", vtype_stringptr, &exim_path },
543 { "exim_uid", vtype_uid, &exim_uid },
544 { "exim_version", vtype_stringptr, &version_string },
545 { "headers_added", vtype_string_func, &fn_hdrs_added },
546 { "home", vtype_stringptr, &deliver_home },
547 { "host", vtype_stringptr, &deliver_host },
548 { "host_address", vtype_stringptr, &deliver_host_address },
549 { "host_data", vtype_stringptr, &host_data },
550 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
551 { "host_lookup_failed", vtype_int, &host_lookup_failed },
552 { "host_port", vtype_int, &deliver_host_port },
553 { "initial_cwd", vtype_stringptr, &initial_cwd },
554 { "inode", vtype_ino, &deliver_inode },
555 { "interface_address", vtype_stringptr, &interface_address },
556 { "interface_port", vtype_int, &interface_port },
557 { "item", vtype_stringptr, &iterate_item },
559 { "ldap_dn", vtype_stringptr, &eldap_dn },
561 { "load_average", vtype_load_avg, NULL },
562 { "local_part", vtype_stringptr, &deliver_localpart },
563 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
564 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
565 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
566 { "local_scan_data", vtype_stringptr, &local_scan_data },
567 { "local_user_gid", vtype_gid, &local_user_gid },
568 { "local_user_uid", vtype_uid, &local_user_uid },
569 { "localhost_number", vtype_int, &host_number },
570 { "log_inodes", vtype_pinodes, (void *)FALSE },
571 { "log_space", vtype_pspace, (void *)FALSE },
572 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
573 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
574 #ifdef WITH_CONTENT_SCAN
575 { "malware_name", vtype_stringptr, &malware_name },
577 { "max_received_linelength", vtype_int, &max_received_linelength },
578 { "message_age", vtype_int, &message_age },
579 { "message_body", vtype_msgbody, &message_body },
580 { "message_body_end", vtype_msgbody_end, &message_body_end },
581 { "message_body_size", vtype_int, &message_body_size },
582 { "message_exim_id", vtype_stringptr, &message_id },
583 { "message_headers", vtype_msgheaders, NULL },
584 { "message_headers_raw", vtype_msgheaders_raw, NULL },
585 { "message_id", vtype_stringptr, &message_id },
586 { "message_linecount", vtype_int, &message_linecount },
587 { "message_size", vtype_int, &message_size },
589 { "message_smtputf8", vtype_bool, &message_smtputf8 },
591 #ifdef WITH_CONTENT_SCAN
592 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
593 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
594 { "mime_boundary", vtype_stringptr, &mime_boundary },
595 { "mime_charset", vtype_stringptr, &mime_charset },
596 { "mime_content_description", vtype_stringptr, &mime_content_description },
597 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
598 { "mime_content_id", vtype_stringptr, &mime_content_id },
599 { "mime_content_size", vtype_int, &mime_content_size },
600 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
601 { "mime_content_type", vtype_stringptr, &mime_content_type },
602 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
603 { "mime_filename", vtype_stringptr, &mime_filename },
604 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
605 { "mime_is_multipart", vtype_int, &mime_is_multipart },
606 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
607 { "mime_part_count", vtype_int, &mime_part_count },
609 { "n0", vtype_filter_int, &filter_n[0] },
610 { "n1", vtype_filter_int, &filter_n[1] },
611 { "n2", vtype_filter_int, &filter_n[2] },
612 { "n3", vtype_filter_int, &filter_n[3] },
613 { "n4", vtype_filter_int, &filter_n[4] },
614 { "n5", vtype_filter_int, &filter_n[5] },
615 { "n6", vtype_filter_int, &filter_n[6] },
616 { "n7", vtype_filter_int, &filter_n[7] },
617 { "n8", vtype_filter_int, &filter_n[8] },
618 { "n9", vtype_filter_int, &filter_n[9] },
619 { "original_domain", vtype_stringptr, &deliver_domain_orig },
620 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
621 { "originator_gid", vtype_gid, &originator_gid },
622 { "originator_uid", vtype_uid, &originator_uid },
623 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
624 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
625 { "pid", vtype_pid, NULL },
627 { "prdr_requested", vtype_bool, &prdr_requested },
629 { "primary_hostname", vtype_stringptr, &primary_hostname },
630 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
631 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
632 { "proxy_external_port", vtype_int, &proxy_external_port },
633 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
634 { "proxy_local_port", vtype_int, &proxy_local_port },
635 { "proxy_session", vtype_bool, &proxy_session },
637 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
638 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
639 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
640 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
641 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
642 { "queue_name", vtype_stringptr, &queue_name },
643 { "rcpt_count", vtype_int, &rcpt_count },
644 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
645 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
646 { "received_count", vtype_int, &received_count },
647 { "received_for", vtype_stringptr, &received_for },
648 { "received_ip_address", vtype_stringptr, &interface_address },
649 { "received_port", vtype_int, &interface_port },
650 { "received_protocol", vtype_stringptr, &received_protocol },
651 { "received_time", vtype_int, &received_time.tv_sec },
652 { "recipient_data", vtype_stringptr, &recipient_data },
653 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
654 { "recipients", vtype_string_func, &fn_recipients },
655 { "recipients_count", vtype_int, &recipients_count },
656 #ifdef WITH_CONTENT_SCAN
657 { "regex_match_string", vtype_stringptr, ®ex_match_string },
659 { "reply_address", vtype_reply, NULL },
660 { "return_path", vtype_stringptr, &return_path },
661 { "return_size_limit", vtype_int, &bounce_return_size_limit },
662 { "router_name", vtype_stringptr, &router_name },
663 { "runrc", vtype_int, &runrc },
664 { "self_hostname", vtype_stringptr, &self_hostname },
665 { "sender_address", vtype_stringptr, &sender_address },
666 { "sender_address_data", vtype_stringptr, &sender_address_data },
667 { "sender_address_domain", vtype_domain, &sender_address },
668 { "sender_address_local_part", vtype_localpart, &sender_address },
669 { "sender_data", vtype_stringptr, &sender_data },
670 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
671 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
672 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
673 { "sender_host_address", vtype_stringptr, &sender_host_address },
674 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
675 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
676 { "sender_host_name", vtype_host_lookup, NULL },
677 { "sender_host_port", vtype_int, &sender_host_port },
678 { "sender_ident", vtype_stringptr, &sender_ident },
679 { "sender_rate", vtype_stringptr, &sender_rate },
680 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
681 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
682 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
683 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
684 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
685 { "sending_port", vtype_int, &sending_port },
686 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
687 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
688 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
689 { "smtp_command_history", vtype_string_func, &smtp_cmd_hist },
690 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
691 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
692 { "sn0", vtype_filter_int, &filter_sn[0] },
693 { "sn1", vtype_filter_int, &filter_sn[1] },
694 { "sn2", vtype_filter_int, &filter_sn[2] },
695 { "sn3", vtype_filter_int, &filter_sn[3] },
696 { "sn4", vtype_filter_int, &filter_sn[4] },
697 { "sn5", vtype_filter_int, &filter_sn[5] },
698 { "sn6", vtype_filter_int, &filter_sn[6] },
699 { "sn7", vtype_filter_int, &filter_sn[7] },
700 { "sn8", vtype_filter_int, &filter_sn[8] },
701 { "sn9", vtype_filter_int, &filter_sn[9] },
702 #ifdef WITH_CONTENT_SCAN
703 { "spam_action", vtype_stringptr, &spam_action },
704 { "spam_bar", vtype_stringptr, &spam_bar },
705 { "spam_report", vtype_stringptr, &spam_report },
706 { "spam_score", vtype_stringptr, &spam_score },
707 { "spam_score_int", vtype_stringptr, &spam_score_int },
710 { "spf_guess", vtype_stringptr, &spf_guess },
711 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
712 { "spf_received", vtype_stringptr, &spf_received },
713 { "spf_result", vtype_stringptr, &spf_result },
714 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
716 { "spool_directory", vtype_stringptr, &spool_directory },
717 { "spool_inodes", vtype_pinodes, (void *)TRUE },
718 { "spool_space", vtype_pspace, (void *)TRUE },
719 #ifdef EXPERIMENTAL_SRS
720 { "srs_db_address", vtype_stringptr, &srs_db_address },
721 { "srs_db_key", vtype_stringptr, &srs_db_key },
722 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
723 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
724 { "srs_recipient", vtype_stringptr, &srs_recipient },
725 { "srs_status", vtype_stringptr, &srs_status },
727 { "thisaddress", vtype_stringptr, &filter_thisaddress },
729 /* The non-(in,out) variables are now deprecated */
730 { "tls_bits", vtype_int, &tls_in.bits },
731 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
732 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
734 { "tls_in_bits", vtype_int, &tls_in.bits },
735 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
736 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
737 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
738 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
739 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
740 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
741 #if defined(SUPPORT_TLS)
742 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
744 { "tls_out_bits", vtype_int, &tls_out.bits },
745 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
746 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
748 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
750 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
751 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
752 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
753 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
754 #if defined(SUPPORT_TLS)
755 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
758 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
761 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
762 #if defined(SUPPORT_TLS)
763 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
766 { "tod_bsdinbox", vtype_todbsdin, NULL },
767 { "tod_epoch", vtype_tode, NULL },
768 { "tod_epoch_l", vtype_todel, NULL },
769 { "tod_full", vtype_todf, NULL },
770 { "tod_log", vtype_todl, NULL },
771 { "tod_logfile", vtype_todlf, NULL },
772 { "tod_zone", vtype_todzone, NULL },
773 { "tod_zulu", vtype_todzulu, NULL },
774 { "transport_name", vtype_stringptr, &transport_name },
775 { "value", vtype_stringptr, &lookup_value },
776 { "verify_mode", vtype_stringptr, &verify_mode },
777 { "version_number", vtype_stringptr, &version_string },
778 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
779 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
780 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
781 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
782 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
783 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
786 static int var_table_size = nelem(var_table);
787 static uschar var_buffer[256];
788 static BOOL malformed_header;
790 /* For textual hashes */
792 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
793 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
796 enum { HMAC_MD5, HMAC_SHA1 };
798 /* For numeric hashes */
800 static unsigned int prime[] = {
801 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
802 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
803 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
805 /* For printing modes in symbolic form */
807 static uschar *mtable_normal[] =
808 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
810 static uschar *mtable_setid[] =
811 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
813 static uschar *mtable_sticky[] =
814 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
818 /*************************************************
819 * Tables for UTF-8 support *
820 *************************************************/
822 /* Table of the number of extra characters, indexed by the first character
823 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
826 static uschar utf8_table1[] = {
827 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
828 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
829 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
830 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
832 /* These are the masks for the data bits in the first byte of a character,
833 indexed by the number of additional bytes. */
835 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
837 /* Get the next UTF-8 character, advancing the pointer. */
839 #define GETUTF8INC(c, ptr) \
841 if ((c & 0xc0) == 0xc0) \
843 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
845 c = (c & utf8_table2[a]) << s; \
849 c |= (*ptr++ & 0x3f) << s; \
855 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
857 /*************************************************
858 * Binary chop search on a table *
859 *************************************************/
861 /* This is used for matching expansion items and operators.
864 name the name that is being sought
865 table the table to search
866 table_size the number of items in the table
868 Returns: the offset in the table, or -1
872 chop_match(uschar *name, uschar **table, int table_size)
874 uschar **bot = table;
875 uschar **top = table + table_size;
879 uschar **mid = bot + (top - bot)/2;
880 int c = Ustrcmp(name, *mid);
881 if (c == 0) return mid - table;
882 if (c > 0) bot = mid + 1; else top = mid;
890 /*************************************************
891 * Check a condition string *
892 *************************************************/
894 /* This function is called to expand a string, and test the result for a "true"
895 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
896 forced fail or lookup defer.
898 We used to release all store used, but this is not not safe due
899 to ${dlfunc } and ${acl }. In any case expand_string_internal()
900 is reasonably careful to release what it can.
902 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
905 condition the condition string
906 m1 text to be incorporated in panic error
909 Returns: TRUE if condition is met, FALSE if not
913 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
916 uschar *ss = expand_string(condition);
919 if (!expand_string_forcedfail && !search_find_defer)
920 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
921 "for %s %s: %s", condition, m1, m2, expand_string_message);
924 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
925 strcmpic(ss, US"false") != 0;
932 /*************************************************
933 * Pseudo-random number generation *
934 *************************************************/
936 /* Pseudo-random number generation. The result is not "expected" to be
937 cryptographically strong but not so weak that someone will shoot themselves
938 in the foot using it as a nonce in some email header scheme or whatever
939 weirdness they'll twist this into. The result should ideally handle fork().
941 However, if we're stuck unable to provide this, then we'll fall back to
942 appallingly bad randomness.
944 If SUPPORT_TLS is defined then this will not be used except as an emergency
949 Returns a random number in range [0, max-1]
953 # define vaguely_random_number vaguely_random_number_fallback
956 vaguely_random_number(int max)
959 # undef vaguely_random_number
961 static pid_t pid = 0;
963 #if defined(HAVE_SRANDOM) && !defined(HAVE_SRANDOMDEV)
973 #ifdef HAVE_ARC4RANDOM
974 /* cryptographically strong randomness, common on *BSD platforms, not
975 so much elsewhere. Alas. */
976 #ifndef NOT_HAVE_ARC4RANDOM_STIR
979 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
980 #ifdef HAVE_SRANDOMDEV
981 /* uses random(4) for seeding */
984 gettimeofday(&tv, NULL);
985 srandom(tv.tv_sec | tv.tv_usec | getpid());
988 /* Poor randomness and no seeding here */
995 #ifdef HAVE_ARC4RANDOM
996 return arc4random() % max;
997 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
998 return random() % max;
1000 /* This one returns a 16-bit number, definitely not crypto-strong */
1001 return random_number(max);
1008 /*************************************************
1009 * Pick out a name from a string *
1010 *************************************************/
1012 /* If the name is too long, it is silently truncated.
1015 name points to a buffer into which to put the name
1016 max is the length of the buffer
1017 s points to the first alphabetic character of the name
1018 extras chars other than alphanumerics to permit
1020 Returns: pointer to the first character after the name
1022 Note: The test for *s != 0 in the while loop is necessary because
1023 Ustrchr() yields non-NULL if the character is zero (which is not something
1026 static const uschar *
1027 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1030 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1032 if (ptr < max-1) name[ptr++] = *s;
1041 /*************************************************
1042 * Pick out the rest of a header name *
1043 *************************************************/
1045 /* A variable name starting $header_ (or just $h_ for those who like
1046 abbreviations) might not be the complete header name because headers can
1047 contain any printing characters in their names, except ':'. This function is
1048 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1049 on the end, if the name was terminated by white space.
1052 name points to a buffer in which the name read so far exists
1053 max is the length of the buffer
1054 s points to the first character after the name so far, i.e. the
1055 first non-alphameric character after $header_xxxxx
1057 Returns: a pointer to the first character after the header name
1060 static const uschar *
1061 read_header_name(uschar *name, int max, const uschar *s)
1063 int prelen = Ustrchr(name, '_') - name + 1;
1064 int ptr = Ustrlen(name) - prelen;
1065 if (ptr > 0) memmove(name, name+prelen, ptr);
1066 while (mac_isgraph(*s) && *s != ':')
1068 if (ptr < max-1) name[ptr++] = *s;
1079 /*************************************************
1080 * Pick out a number from a string *
1081 *************************************************/
1084 n points to an integer into which to put the number
1085 s points to the first digit of the number
1087 Returns: a pointer to the character after the last digit
1089 /*XXX consider expanding to int_eximarith_t. But the test for
1090 "overbig numbers" in 0002 still needs to overflow it. */
1093 read_number(int *n, uschar *s)
1096 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1100 static const uschar *
1101 read_cnumber(int *n, const uschar *s)
1104 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1110 /*************************************************
1111 * Extract keyed subfield from a string *
1112 *************************************************/
1114 /* The yield is in dynamic store; NULL means that the key was not found.
1117 key points to the name of the key
1118 s points to the string from which to extract the subfield
1120 Returns: NULL if the subfield was not found, or
1121 a pointer to the subfield's data
1125 expand_getkeyed(uschar *key, const uschar *s)
1127 int length = Ustrlen(key);
1128 while (isspace(*s)) s++;
1130 /* Loop to search for the key */
1136 const uschar *dkey = s;
1138 while (*s != 0 && *s != '=' && !isspace(*s)) s++;
1139 dkeylength = s - dkey;
1140 while (isspace(*s)) s++;
1141 if (*s == '=') while (isspace((*(++s))));
1143 data = string_dequote(&s);
1144 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1147 while (isspace(*s)) s++;
1156 find_var_ent(uschar * name)
1159 int last = var_table_size;
1161 while (last > first)
1163 int middle = (first + last)/2;
1164 int c = Ustrcmp(name, var_table[middle].name);
1166 if (c > 0) { first = middle + 1; continue; }
1167 if (c < 0) { last = middle; continue; }
1168 return &var_table[middle];
1173 /*************************************************
1174 * Extract numbered subfield from string *
1175 *************************************************/
1177 /* Extracts a numbered field from a string that is divided by tokens - for
1178 example a line from /etc/passwd is divided by colon characters. First field is
1179 numbered one. Negative arguments count from the right. Zero returns the whole
1180 string. Returns NULL if there are insufficient tokens in the string
1183 Modifies final argument - this is a dynamically generated string, so that's OK.
1186 field number of field to be extracted,
1187 first field = 1, whole string = 0, last field = -1
1188 separators characters that are used to break string into tokens
1189 s points to the string from which to extract the subfield
1191 Returns: NULL if the field was not found,
1192 a pointer to the field's data inside s (modified to add 0)
1196 expand_gettokened (int field, uschar *separators, uschar *s)
1201 uschar *fieldtext = NULL;
1203 if (field == 0) return s;
1205 /* Break the line up into fields in place; for field > 0 we stop when we have
1206 done the number of fields we want. For field < 0 we continue till the end of
1207 the string, counting the number of fields. */
1209 count = (field > 0)? field : INT_MAX;
1215 /* Previous field was the last one in the string. For a positive field
1216 number, this means there are not enough fields. For a negative field number,
1217 check that there are enough, and scan back to find the one that is wanted. */
1221 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1222 if ((-field) == (INT_MAX - count - 1)) return s;
1226 while (ss[-1] != 0) ss--;
1232 /* Previous field was not last in the string; save its start and put a
1236 len = Ustrcspn(ss, separators);
1247 expand_getlistele(int field, const uschar * list)
1249 const uschar * tlist= list;
1255 for(field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1258 if(field==0) return NULL;
1259 while(--field>0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1260 return string_nextinlist(&list, &sep, NULL, 0);
1264 /* Certificate fields, by name. Worry about by-OID later */
1265 /* Names are chosen to not have common prefixes */
1272 uschar * (*getfn)(void * cert, uschar * mod);
1274 static certfield certfields[] =
1275 { /* linear search; no special order */
1276 { US"version", 7, &tls_cert_version },
1277 { US"serial_number", 13, &tls_cert_serial_number },
1278 { US"subject", 7, &tls_cert_subject },
1279 { US"notbefore", 9, &tls_cert_not_before },
1280 { US"notafter", 8, &tls_cert_not_after },
1281 { US"issuer", 6, &tls_cert_issuer },
1282 { US"signature", 9, &tls_cert_signature },
1283 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1284 { US"subj_altname", 12, &tls_cert_subject_altname },
1285 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1286 { US"crl_uri", 7, &tls_cert_crl_uri },
1290 expand_getcertele(uschar * field, uschar * certvar)
1295 if (!(vp = find_var_ent(certvar)))
1297 expand_string_message =
1298 string_sprintf("no variable named \"%s\"", certvar);
1299 return NULL; /* Unknown variable name */
1301 /* NB this stops us passing certs around in variable. Might
1302 want to do that in future */
1303 if (vp->type != vtype_cert)
1305 expand_string_message =
1306 string_sprintf("\"%s\" is not a certificate", certvar);
1307 return NULL; /* Unknown variable name */
1309 if (!*(void **)vp->value)
1312 if (*field >= '0' && *field <= '9')
1313 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1315 for(cp = certfields;
1316 cp < certfields + nelem(certfields);
1318 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1320 uschar * modifier = *(field += cp->namelen) == ','
1322 return (*cp->getfn)( *(void **)vp->value, modifier );
1325 expand_string_message =
1326 string_sprintf("bad field selector \"%s\" for certextract", field);
1329 #endif /*SUPPORT_TLS*/
1331 /*************************************************
1332 * Extract a substring from a string *
1333 *************************************************/
1335 /* Perform the ${substr or ${length expansion operations.
1338 subject the input string
1339 value1 the offset from the start of the input string to the start of
1340 the output string; if negative, count from the right.
1341 value2 the length of the output string, or negative (-1) for unset
1342 if value1 is positive, unset means "all after"
1343 if value1 is negative, unset means "all before"
1344 len set to the length of the returned string
1346 Returns: pointer to the output string, or NULL if there is an error
1350 extract_substr(uschar *subject, int value1, int value2, int *len)
1352 int sublen = Ustrlen(subject);
1354 if (value1 < 0) /* count from right */
1358 /* If the position is before the start, skip to the start, and adjust the
1359 length. If the length ends up negative, the substring is null because nothing
1360 can precede. This falls out naturally when the length is unset, meaning "all
1366 if (value2 < 0) value2 = 0;
1370 /* Otherwise an unset length => characters before value1 */
1372 else if (value2 < 0)
1379 /* For a non-negative offset, if the starting position is past the end of the
1380 string, the result will be the null string. Otherwise, an unset length means
1381 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1385 if (value1 > sublen)
1390 else if (value2 < 0) value2 = sublen;
1393 /* Cut the length down to the maximum possible for the offset value, and get
1394 the required characters. */
1396 if (value1 + value2 > sublen) value2 = sublen - value1;
1398 return subject + value1;
1404 /*************************************************
1405 * Old-style hash of a string *
1406 *************************************************/
1408 /* Perform the ${hash expansion operation.
1411 subject the input string (an expanded substring)
1412 value1 the length of the output string; if greater or equal to the
1413 length of the input string, the input string is returned
1414 value2 the number of hash characters to use, or 26 if negative
1415 len set to the length of the returned string
1417 Returns: pointer to the output string, or NULL if there is an error
1421 compute_hash(uschar *subject, int value1, int value2, int *len)
1423 int sublen = Ustrlen(subject);
1425 if (value2 < 0) value2 = 26;
1426 else if (value2 > Ustrlen(hashcodes))
1428 expand_string_message =
1429 string_sprintf("hash count \"%d\" too big", value2);
1433 /* Calculate the hash text. We know it is shorter than the original string, so
1434 can safely place it in subject[] (we know that subject is always itself an
1435 expanded substring). */
1437 if (value1 < sublen)
1442 while ((c = (subject[j])) != 0)
1444 int shift = (c + j++) & 7;
1445 subject[i] ^= (c << shift) | (c >> (8-shift));
1446 if (++i >= value1) i = 0;
1448 for (i = 0; i < value1; i++)
1449 subject[i] = hashcodes[(subject[i]) % value2];
1451 else value1 = sublen;
1460 /*************************************************
1461 * Numeric hash of a string *
1462 *************************************************/
1464 /* Perform the ${nhash expansion operation. The first characters of the
1465 string are treated as most important, and get the highest prime numbers.
1468 subject the input string
1469 value1 the maximum value of the first part of the result
1470 value2 the maximum value of the second part of the result,
1471 or negative to produce only a one-part result
1472 len set to the length of the returned string
1474 Returns: pointer to the output string, or NULL if there is an error.
1478 compute_nhash (uschar *subject, int value1, int value2, int *len)
1480 uschar *s = subject;
1482 unsigned long int total = 0; /* no overflow */
1486 if (i == 0) i = nelem(prime) - 1;
1487 total += prime[i--] * (unsigned int)(*s++);
1490 /* If value2 is unset, just compute one number */
1493 s = string_sprintf("%lu", total % value1);
1495 /* Otherwise do a div/mod hash */
1499 total = total % (value1 * value2);
1500 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1511 /*************************************************
1512 * Find the value of a header or headers *
1513 *************************************************/
1515 /* Multiple instances of the same header get concatenated, and this function
1516 can also return a concatenation of all the header lines. When concatenating
1517 specific headers that contain lists of addresses, a comma is inserted between
1518 them. Otherwise we use a straight concatenation. Because some messages can have
1519 pathologically large number of lines, there is a limit on the length that is
1520 returned. Also, to avoid massive store use which would result from using
1521 string_cat() as it copies and extends strings, we do a preliminary pass to find
1522 out exactly how much store will be needed. On "normal" messages this will be
1526 name the name of the header, without the leading $header_ or $h_,
1527 or NULL if a concatenation of all headers is required
1528 exists_only TRUE if called from a def: test; don't need to build a string;
1529 just return a string that is not "" and not "0" if the header
1531 newsize return the size of memory block that was obtained; may be NULL
1532 if exists_only is TRUE
1533 want_raw TRUE if called for $rh_ or $rheader_ variables; no processing,
1534 other than concatenating, will be done on the header. Also used
1535 for $message_headers_raw.
1536 charset name of charset to translate MIME words to; used only if
1537 want_raw is false; if NULL, no translation is done (this is
1538 used for $bh_ and $bheader_)
1540 Returns: NULL if the header does not exist, else a pointer to a new
1545 find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw,
1548 BOOL found = name == NULL;
1550 int len = found? 0 : Ustrlen(name);
1552 uschar *yield = NULL;
1555 /* Loop for two passes - saves code repetition */
1557 for (i = 0; i < 2; i++)
1562 for (h = header_list; size < header_insert_maxlen && h; h = h->next)
1563 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1564 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1569 if (exists_only) return US"1"; /* don't need actual string */
1571 t = h->text + len; /* text to insert */
1572 if (!want_raw) /* unless wanted raw, */
1573 while (isspace(*t)) t++; /* remove leading white space */
1574 ilen = h->slen - (t - h->text); /* length to insert */
1576 /* Unless wanted raw, remove trailing whitespace, including the
1580 while (ilen > 0 && isspace(t[ilen-1])) ilen--;
1582 /* Set comma = 1 if handling a single header and it's one of those
1583 that contains an address list, except when asked for raw headers. Only
1584 need to do this once. */
1586 if (!want_raw && name && comma == 0 &&
1587 Ustrchr("BCFRST", h->type) != NULL)
1590 /* First pass - compute total store needed; second pass - compute
1591 total store used, including this header. */
1593 size += ilen + comma + 1; /* +1 for the newline */
1595 /* Second pass - concatenate the data, up to a maximum. Note that
1596 the loop stops when size hits the limit. */
1600 if (size > header_insert_maxlen)
1602 ilen -= size - header_insert_maxlen - 1;
1605 Ustrncpy(ptr, t, ilen);
1608 /* For a non-raw header, put in the comma if needed, then add
1609 back the newline we removed above, provided there was some text in
1612 if (!want_raw && ilen > 0)
1614 if (comma != 0) *ptr++ = ',';
1620 /* At end of first pass, return NULL if no header found. Then truncate size
1621 if necessary, and get the buffer to hold the data, returning the buffer size.
1626 if (!found) return NULL;
1627 if (size > header_insert_maxlen) size = header_insert_maxlen;
1628 *newsize = size + 1;
1629 ptr = yield = store_get(*newsize);
1633 /* That's all we do for raw header expansion. */
1638 /* Otherwise, remove a final newline and a redundant added comma. Then we do
1639 RFC 2047 decoding, translating the charset if requested. The rfc2047_decode2()
1640 function can return an error with decoded data if the charset translation
1641 fails. If decoding fails, it returns NULL. */
1645 uschar *decoded, *error;
1646 if (ptr > yield && ptr[-1] == '\n') ptr--;
1647 if (ptr > yield && comma != 0 && ptr[-1] == ',') ptr--;
1649 decoded = rfc2047_decode2(yield, check_rfc2047_length, charset, '?', NULL,
1653 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1654 " input was: %s\n", error, yield);
1656 if (decoded != NULL) yield = decoded;
1665 /* Append an "iprev" element to an Autherntication-Results: header
1666 if we have attempted to get the calling host's name.
1670 authres_iprev(gstring * g)
1672 if (sender_host_name)
1673 return string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1674 if (host_lookup_deferred)
1675 return string_catn(g, US";\n\tiprev=temperror", 19);
1676 if (host_lookup_failed)
1677 return string_catn(g, US";\n\tiprev=fail", 13);
1683 /*************************************************
1684 * Return list of recipients *
1685 *************************************************/
1686 /* A recipients list is available only during system message filtering,
1687 during ACL processing after DATA, and while expanding pipe commands
1688 generated from a system filter, but not elsewhere. */
1696 if (!enable_dollar_recipients) return NULL;
1698 for (i = 0; i < recipients_count; i++)
1700 /*XXX variant of list_appendele? */
1701 if (i != 0) g = string_catn(g, US", ", 2);
1702 g = string_cat(g, recipients_list[i].address);
1704 return string_from_gstring(g);
1708 /*************************************************
1709 * Find value of a variable *
1710 *************************************************/
1712 /* The table of variables is kept in alphabetic order, so we can search it
1713 using a binary chop. The "choplen" variable is nothing to do with the binary
1717 name the name of the variable being sought
1718 exists_only TRUE if this is a def: test; passed on to find_header()
1719 skipping TRUE => skip any processing evaluation; this is not the same as
1720 exists_only because def: may test for values that are first
1722 newsize pointer to an int which is initially zero; if the answer is in
1723 a new memory buffer, *newsize is set to its size
1725 Returns: NULL if the variable does not exist, or
1726 a pointer to the variable's contents, or
1727 something non-NULL if exists_only is TRUE
1731 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1738 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1739 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1740 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1741 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1742 (this gave backwards compatibility at the changeover). There may be built-in
1743 variables whose names start acl_ but they should never start in this way. This
1744 slightly messy specification is a consequence of the history, needless to say.
1746 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1747 set, in which case give an error. */
1749 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1753 tree_search((name[4] == 'c')? acl_var_c : acl_var_m, name + 4);
1754 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1757 /* Handle $auth<n> variables. */
1759 if (Ustrncmp(name, "auth", 4) == 0)
1762 int n = Ustrtoul(name + 4, &endptr, 10);
1763 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1764 return !auth_vars[n-1] ? US"" : auth_vars[n-1];
1766 else if (Ustrncmp(name, "regex", 5) == 0)
1769 int n = Ustrtoul(name + 5, &endptr, 10);
1770 if (*endptr == 0 && n != 0 && n <= REGEX_VARS)
1771 return !regex_vars[n-1] ? US"" : regex_vars[n-1];
1774 /* For all other variables, search the table */
1776 if (!(vp = find_var_ent(name)))
1777 return NULL; /* Unknown variable name */
1779 /* Found an existing variable. If in skipping state, the value isn't needed,
1780 and we want to avoid processing (such as looking up the host name). */
1788 case vtype_filter_int:
1789 if (!filter_running) return NULL;
1793 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1797 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1801 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1805 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1809 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1812 case vtype_stringptr: /* Pointer to string */
1813 return (s = *((uschar **)(val))) ? s : US"";
1816 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1819 case vtype_load_avg:
1820 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1823 case vtype_host_lookup: /* Lookup if not done so */
1824 if ( !sender_host_name && sender_host_address
1825 && !host_lookup_failed && host_name_lookup() == OK)
1826 host_build_sender_fullhost();
1827 return sender_host_name ? sender_host_name : US"";
1829 case vtype_localpart: /* Get local part from address */
1830 s = *((uschar **)(val));
1831 if (s == NULL) return US"";
1832 domain = Ustrrchr(s, '@');
1833 if (domain == NULL) return s;
1834 if (domain - s > sizeof(var_buffer) - 1)
1835 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1836 " in string expansion", sizeof(var_buffer));
1837 Ustrncpy(var_buffer, s, domain - s);
1838 var_buffer[domain - s] = 0;
1841 case vtype_domain: /* Get domain from address */
1842 s = *((uschar **)(val));
1843 if (s == NULL) return US"";
1844 domain = Ustrrchr(s, '@');
1845 return (domain == NULL)? US"" : domain + 1;
1847 case vtype_msgheaders:
1848 return find_header(NULL, exists_only, newsize, FALSE, NULL);
1850 case vtype_msgheaders_raw:
1851 return find_header(NULL, exists_only, newsize, TRUE, NULL);
1853 case vtype_msgbody: /* Pointer to msgbody string */
1854 case vtype_msgbody_end: /* Ditto, the end of the msg */
1855 ss = (uschar **)(val);
1856 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1859 off_t start_offset = SPOOL_DATA_START_OFFSET;
1860 int len = message_body_visible;
1861 if (len > message_size) len = message_size;
1862 *ss = body = store_malloc(len+1);
1864 if (vp->type == vtype_msgbody_end)
1866 struct stat statbuf;
1867 if (fstat(deliver_datafile, &statbuf) == 0)
1869 start_offset = statbuf.st_size - len;
1870 if (start_offset < SPOOL_DATA_START_OFFSET)
1871 start_offset = SPOOL_DATA_START_OFFSET;
1874 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
1875 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
1877 len = read(deliver_datafile, body, len);
1881 if (message_body_newlines) /* Separate loops for efficiency */
1883 { if (body[--len] == 0) body[len] = ' '; }
1886 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1889 return *ss ? *ss : US"";
1891 case vtype_todbsdin: /* BSD inbox time of day */
1892 return tod_stamp(tod_bsdin);
1894 case vtype_tode: /* Unix epoch time of day */
1895 return tod_stamp(tod_epoch);
1897 case vtype_todel: /* Unix epoch/usec time of day */
1898 return tod_stamp(tod_epoch_l);
1900 case vtype_todf: /* Full time of day */
1901 return tod_stamp(tod_full);
1903 case vtype_todl: /* Log format time of day */
1904 return tod_stamp(tod_log_bare); /* (without timezone) */
1906 case vtype_todzone: /* Time zone offset only */
1907 return tod_stamp(tod_zone);
1909 case vtype_todzulu: /* Zulu time */
1910 return tod_stamp(tod_zulu);
1912 case vtype_todlf: /* Log file datestamp tod */
1913 return tod_stamp(tod_log_datestamp_daily);
1915 case vtype_reply: /* Get reply address */
1916 s = find_header(US"reply-to:", exists_only, newsize, TRUE,
1918 if (s != NULL) while (isspace(*s)) s++;
1919 if (s == NULL || *s == 0)
1921 *newsize = 0; /* For the *s==0 case */
1922 s = find_header(US"from:", exists_only, newsize, TRUE, headers_charset);
1927 while (isspace(*s)) s++;
1928 for (t = s; *t != 0; t++) if (*t == '\n') *t = ' ';
1929 while (t > s && isspace(t[-1])) t--;
1932 return (s == NULL)? US"" : s;
1934 case vtype_string_func:
1936 uschar * (*fn)() = val;
1943 sprintf(CS var_buffer, "%d",
1944 receive_statvfs(val == (void *)TRUE, &inodes));
1951 (void) receive_statvfs(val == (void *)TRUE, &inodes);
1952 sprintf(CS var_buffer, "%d", inodes);
1957 return *(void **)val ? US"<cert>" : US"";
1959 #ifndef DISABLE_DKIM
1961 return dkim_exim_expand_query((int)(long)val);
1966 return NULL; /* Unknown variable. Silences static checkers. */
1973 modify_variable(uschar *name, void * value)
1976 if ((vp = find_var_ent(name))) vp->value = value;
1977 return; /* Unknown variable name, fail silently */
1985 /*************************************************
1986 * Read and expand substrings *
1987 *************************************************/
1989 /* This function is called to read and expand argument substrings for various
1990 expansion items. Some have a minimum requirement that is less than the maximum;
1991 in these cases, the first non-present one is set to NULL.
1994 sub points to vector of pointers to set
1995 n maximum number of substrings
1997 sptr points to current string pointer
1998 skipping the skipping flag
1999 check_end if TRUE, check for final '}'
2000 name name of item, for error message
2001 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2004 Returns: 0 OK; string pointer updated
2005 1 curly bracketing error (too few arguments)
2006 2 too many arguments (only if check_end is set); message set
2007 3 other error (expansion failure)
2011 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2012 BOOL check_end, uschar *name, BOOL *resetok)
2015 const uschar *s = *sptr;
2017 while (isspace(*s)) s++;
2018 for (i = 0; i < n; i++)
2024 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2025 "(min is %d)", name, m);
2031 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2033 if (*s++ != '}') return 1;
2034 while (isspace(*s)) s++;
2036 if (check_end && *s++ != '}')
2040 expand_string_message = string_sprintf("Too many arguments for '%s' "
2041 "(max is %d)", name, n);
2044 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2055 /*************************************************
2056 * Elaborate message for bad variable *
2057 *************************************************/
2059 /* For the "unknown variable" message, take a look at the variable's name, and
2060 give additional information about possible ACL variables. The extra information
2061 is added on to expand_string_message.
2063 Argument: the name of the variable
2068 check_variable_error_message(uschar *name)
2070 if (Ustrncmp(name, "acl_", 4) == 0)
2071 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2072 (name[4] == 'c' || name[4] == 'm')?
2074 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2075 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2077 US"user-defined ACL variables must start acl_c or acl_m");
2083 Load args from sub array to globals, and call acl_check().
2084 Sub array will be corrupted on return.
2086 Returns: OK access is granted by an ACCEPT verb
2087 DISCARD access is (apparently) granted by a DISCARD verb
2088 FAIL access is denied
2089 FAIL_DROP access is denied; drop the connection
2090 DEFER can't tell at the moment
2094 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2097 int sav_narg = acl_narg;
2099 uschar * dummy_logmsg;
2100 extern int acl_where;
2102 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2103 for (i = 0; i < nsub && sub[i+1]; i++)
2105 uschar * tmp = acl_arg[i];
2106 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2107 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2112 sub[i+1] = acl_arg[i];
2113 acl_arg[i++] = NULL;
2117 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2119 acl_narg>0 ? acl_arg[0] : US"<none>",
2120 acl_narg>1 ? " +more" : "");
2122 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2124 for (i = 0; i < nsub; i++)
2125 acl_arg[i] = sub[i+1]; /* restore old args */
2126 acl_narg = sav_narg;
2134 /*************************************************
2135 * Read and evaluate a condition *
2136 *************************************************/
2140 s points to the start of the condition text
2141 resetok points to a BOOL which is written false if it is unsafe to
2142 free memory. Certain condition types (acl) may have side-effect
2143 allocation which must be preserved.
2144 yield points to a BOOL to hold the result of the condition test;
2145 if NULL, we are just reading through a condition that is
2146 part of an "or" combination to check syntax, or in a state
2147 where the answer isn't required
2149 Returns: a pointer to the first character after the condition, or
2153 static const uschar *
2154 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2156 BOOL testfor = TRUE;
2157 BOOL tempcond, combined_cond;
2159 BOOL sub2_honour_dollar = TRUE;
2160 int i, rc, cond_type, roffset;
2161 int_eximarith_t num[2];
2162 struct stat statbuf;
2164 const uschar *sub[10];
2167 const uschar *rerror;
2171 while (isspace(*s)) s++;
2172 if (*s == '!') { testfor = !testfor; s++; } else break;
2175 /* Numeric comparisons are symbolic */
2177 if (*s == '=' || *s == '>' || *s == '<')
2189 /* All other conditions are named */
2191 else s = read_name(name, 256, s, US"_");
2193 /* If we haven't read a name, it means some non-alpha character is first. */
2197 expand_string_message = string_sprintf("condition name expected, "
2198 "but found \"%.16s\"", s);
2202 /* Find which condition we are dealing with, and switch on it */
2204 cond_type = chop_match(name, cond_table, nelem(cond_table));
2207 /* def: tests for a non-empty variable, or for the existence of a header. If
2208 yield == NULL we are in a skipping state, and don't care about the answer. */
2213 expand_string_message = US"\":\" expected after \"def\"";
2217 s = read_name(name, 256, s+1, US"_");
2219 /* Test for a header's existence. If the name contains a closing brace
2220 character, this may be a user error where the terminating colon has been
2221 omitted. Set a flag to adjust a subsequent error message in this case. */
2223 if (Ustrncmp(name, "h_", 2) == 0 ||
2224 Ustrncmp(name, "rh_", 3) == 0 ||
2225 Ustrncmp(name, "bh_", 3) == 0 ||
2226 Ustrncmp(name, "header_", 7) == 0 ||
2227 Ustrncmp(name, "rheader_", 8) == 0 ||
2228 Ustrncmp(name, "bheader_", 8) == 0)
2230 s = read_header_name(name, 256, s);
2231 /* {-for-text-editors */
2232 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2233 if (yield != NULL) *yield =
2234 (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor;
2237 /* Test for a variable's having a non-empty value. A non-existent variable
2238 causes an expansion failure. */
2242 uschar *value = find_variable(name, TRUE, yield == NULL, NULL);
2245 expand_string_message = (name[0] == 0)?
2246 string_sprintf("variable name omitted after \"def:\"") :
2247 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
2248 check_variable_error_message(name);
2251 if (yield != NULL) *yield = (value[0] != 0) == testfor;
2257 /* first_delivery tests for first delivery attempt */
2259 case ECOND_FIRST_DELIVERY:
2260 if (yield != NULL) *yield = deliver_firsttime == testfor;
2264 /* queue_running tests for any process started by a queue runner */
2266 case ECOND_QUEUE_RUNNING:
2267 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
2271 /* exists: tests for file existence
2272 isip: tests for any IP address
2273 isip4: tests for an IPv4 address
2274 isip6: tests for an IPv6 address
2275 pam: does PAM authentication
2276 radius: does RADIUS authentication
2277 ldapauth: does LDAP authentication
2278 pwcheck: does Cyrus SASL pwcheck authentication
2287 case ECOND_LDAPAUTH:
2290 while (isspace(*s)) s++;
2291 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2293 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2294 if (sub[0] == NULL) return NULL;
2295 /* {-for-text-editors */
2296 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2298 if (yield == NULL) return s; /* No need to run the test if skipping */
2303 if ((expand_forbid & RDO_EXISTS) != 0)
2305 expand_string_message = US"File existence tests are not permitted";
2308 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2314 rc = string_is_ip_address(sub[0], NULL);
2315 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2316 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2319 /* Various authentication tests - all optionally compiled */
2323 rc = auth_call_pam(sub[0], &expand_string_message);
2326 goto COND_FAILED_NOT_COMPILED;
2327 #endif /* SUPPORT_PAM */
2330 #ifdef RADIUS_CONFIG_FILE
2331 rc = auth_call_radius(sub[0], &expand_string_message);
2334 goto COND_FAILED_NOT_COMPILED;
2335 #endif /* RADIUS_CONFIG_FILE */
2337 case ECOND_LDAPAUTH:
2340 /* Just to keep the interface the same */
2342 int old_pool = store_pool;
2343 store_pool = POOL_SEARCH;
2344 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2345 &expand_string_message, &do_cache);
2346 store_pool = old_pool;
2350 goto COND_FAILED_NOT_COMPILED;
2351 #endif /* LOOKUP_LDAP */
2354 #ifdef CYRUS_PWCHECK_SOCKET
2355 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2358 goto COND_FAILED_NOT_COMPILED;
2359 #endif /* CYRUS_PWCHECK_SOCKET */
2361 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2362 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2364 if (rc == ERROR || rc == DEFER) return NULL;
2365 *yield = (rc == OK) == testfor;
2371 /* call ACL (in a conditional context). Accept true, deny false.
2372 Defer is a forced-fail. Anything set by message= goes to $value.
2373 Up to ten parameters are used; we use the braces round the name+args
2374 like the saslauthd condition does, to permit a variable number of args.
2375 See also the expansion-item version EITEM_ACL and the traditional
2376 acl modifier ACLC_ACL.
2377 Since the ACL may allocate new global variables, tell our caller to not
2382 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2388 while (isspace(*s)) s++;
2389 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2391 switch(read_subs(sub, nelem(sub), 1,
2392 &s, yield == NULL, TRUE, US"acl", resetok))
2394 case 1: expand_string_message = US"too few arguments or bracketing "
2397 case 3: return NULL;
2402 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2403 switch(eval_acl(sub, nelem(sub), &user_msg))
2408 lookup_value = NULL;
2410 lookup_value = string_copy(user_msg);
2411 *yield = cond == testfor;
2415 expand_string_forcedfail = TRUE;
2418 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
2426 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2428 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2430 However, the last two are optional. That is why the whole set is enclosed
2431 in their own set of braces. */
2433 case ECOND_SASLAUTHD:
2434 #ifndef CYRUS_SASLAUTHD_SOCKET
2435 goto COND_FAILED_NOT_COMPILED;
2439 while (isspace(*s)) s++;
2440 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2441 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, US"saslauthd",
2444 case 1: expand_string_message = US"too few arguments or bracketing "
2445 "error for saslauthd";
2447 case 3: return NULL;
2449 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
2452 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2453 &expand_string_message);
2454 if (rc == ERROR || rc == DEFER) return NULL;
2455 *yield = (rc == OK) == testfor;
2459 #endif /* CYRUS_SASLAUTHD_SOCKET */
2462 /* symbolic operators for numeric and string comparison, and a number of
2463 other operators, all requiring two arguments.
2465 crypteq: encrypts plaintext and compares against an encrypted text,
2466 using crypt(), crypt16(), MD5 or SHA-1
2467 inlist/inlisti: checks if first argument is in the list of the second
2468 match: does a regular expression match and sets up the numerical
2469 variables if it succeeds
2470 match_address: matches in an address list
2471 match_domain: matches in a domain list
2472 match_ip: matches a host list that is restricted to IP addresses
2473 match_local_part: matches in a local part list
2476 case ECOND_MATCH_ADDRESS:
2477 case ECOND_MATCH_DOMAIN:
2478 case ECOND_MATCH_IP:
2479 case ECOND_MATCH_LOCAL_PART:
2480 #ifndef EXPAND_LISTMATCH_RHS
2481 sub2_honour_dollar = FALSE;
2490 case ECOND_NUM_L: /* Numerical comparisons */
2497 case ECOND_STR_LT: /* String comparisons */
2508 for (i = 0; i < 2; i++)
2510 /* Sometimes, we don't expand substrings; too many insecure configurations
2511 created using match_address{}{} and friends, where the second param
2512 includes information from untrustworthy sources. */
2513 BOOL honour_dollar = TRUE;
2514 if ((i > 0) && !sub2_honour_dollar)
2515 honour_dollar = FALSE;
2517 while (isspace(*s)) s++;
2520 if (i == 0) goto COND_FAILED_CURLY_START;
2521 expand_string_message = string_sprintf("missing 2nd string in {} "
2522 "after \"%s\"", name);
2525 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2526 honour_dollar, resetok)))
2528 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2529 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2530 " for security reasons\n");
2531 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2533 /* Convert to numerical if required; we know that the names of all the
2534 conditions that compare numbers do not start with a letter. This just saves
2535 checking for them individually. */
2537 if (!isalpha(name[0]) && yield != NULL)
2542 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2546 num[i] = expanded_string_integer(sub[i], FALSE);
2547 if (expand_string_message != NULL) return NULL;
2551 /* Result not required */
2553 if (yield == NULL) return s;
2555 /* Do an appropriate comparison */
2561 tempcond = (num[0] == num[1]);
2565 tempcond = (num[0] > num[1]);
2569 tempcond = (num[0] >= num[1]);
2573 tempcond = (num[0] < num[1]);
2577 tempcond = (num[0] <= num[1]);
2581 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2585 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2589 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2593 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2597 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2601 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2605 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2609 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2613 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2617 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2620 case ECOND_MATCH: /* Regular expression match */
2621 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
2625 expand_string_message = string_sprintf("regular expression error in "
2626 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2629 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2632 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2633 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2634 goto MATCHED_SOMETHING;
2636 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2637 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2638 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2639 goto MATCHED_SOMETHING;
2641 case ECOND_MATCH_IP: /* Match IP address in a host list */
2642 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2644 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2650 unsigned int *nullcache = NULL;
2651 check_host_block cb;
2653 cb.host_name = US"";
2654 cb.host_address = sub[0];
2656 /* If the host address starts off ::ffff: it is an IPv6 address in
2657 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2660 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2661 cb.host_address + 7 : cb.host_address;
2663 rc = match_check_list(
2664 &sub[1], /* the list */
2665 0, /* separator character */
2666 &hostlist_anchor, /* anchor pointer */
2667 &nullcache, /* cache pointer */
2668 check_host, /* function for testing */
2669 &cb, /* argument for function */
2670 MCL_HOST, /* type of check */
2671 sub[0], /* text for debugging */
2672 NULL); /* where to pass back data */
2674 goto MATCHED_SOMETHING;
2676 case ECOND_MATCH_LOCAL_PART:
2677 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2678 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
2693 expand_string_message = string_sprintf("unable to complete match "
2694 "against \"%s\": %s", sub[1], search_error_message);
2700 /* Various "encrypted" comparisons. If the second string starts with
2701 "{" then an encryption type is given. Default to crypt() or crypt16()
2702 (build-time choice). */
2703 /* }-for-text-editors */
2706 #ifndef SUPPORT_CRYPTEQ
2707 goto COND_FAILED_NOT_COMPILED;
2709 if (strncmpic(sub[1], US"{md5}", 5) == 0)
2711 int sublen = Ustrlen(sub[1]+5);
2716 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
2718 /* If the length that we are comparing against is 24, the MD5 digest
2719 is expressed as a base64 string. This is the way LDAP does it. However,
2720 some other software uses a straightforward hex representation. We assume
2721 this if the length is 32. Other lengths fail. */
2725 uschar *coded = b64encode(digest, 16);
2726 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
2727 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2728 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
2730 else if (sublen == 32)
2734 for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2736 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
2737 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2738 tempcond = (strcmpic(coded, sub[1]+5) == 0);
2742 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
2743 "fail\n crypted=%s\n", sub[1]+5);
2748 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
2750 int sublen = Ustrlen(sub[1]+6);
2755 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
2757 /* If the length that we are comparing against is 28, assume the SHA1
2758 digest is expressed as a base64 string. If the length is 40, assume a
2759 straightforward hex representation. Other lengths fail. */
2763 uschar *coded = b64encode(digest, 20);
2764 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
2765 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2766 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
2768 else if (sublen == 40)
2772 for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2774 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
2775 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2776 tempcond = (strcmpic(coded, sub[1]+6) == 0);
2780 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
2781 "fail\n crypted=%s\n", sub[1]+6);
2786 else /* {crypt} or {crypt16} and non-{ at start */
2787 /* }-for-text-editors */
2792 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2797 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2802 else if (sub[1][0] == '{') /* }-for-text-editors */
2804 expand_string_message = string_sprintf("unknown encryption mechanism "
2805 "in \"%s\"", sub[1]);
2811 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2812 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2813 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2817 #define XSTR(s) STR(s)
2818 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2819 " subject=%s\n crypted=%s\n",
2820 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
2825 /* If the encrypted string contains fewer than two characters (for the
2826 salt), force failure. Otherwise we get false positives: with an empty
2827 string the yield of crypt() is an empty string! */
2830 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
2831 else if (errno == EINVAL)
2835 expand_string_message = string_sprintf("crypt error: %s\n",
2836 US strerror(errno));
2841 #endif /* SUPPORT_CRYPTEQ */
2846 const uschar * list = sub[1];
2848 uschar *save_iterate_item = iterate_item;
2849 int (*compare)(const uschar *, const uschar *);
2851 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", name, sub[0]);
2854 compare = cond_type == ECOND_INLISTI
2855 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
2857 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
2859 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
2860 if (compare(sub[0], iterate_item) == 0)
2866 iterate_item = save_iterate_item;
2869 } /* Switch for comparison conditions */
2871 *yield = tempcond == testfor;
2872 return s; /* End of comparison conditions */
2875 /* and/or: computes logical and/or of several conditions */
2879 subcondptr = (yield == NULL)? NULL : &tempcond;
2880 combined_cond = (cond_type == ECOND_AND);
2882 while (isspace(*s)) s++;
2883 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2887 while (isspace(*s)) s++;
2888 /* {-for-text-editors */
2889 if (*s == '}') break;
2890 if (*s != '{') /* }-for-text-editors */
2892 expand_string_message = string_sprintf("each subcondition "
2893 "inside an \"%s{...}\" condition must be in its own {}", name);
2897 if (!(s = eval_condition(s+1, resetok, subcondptr)))
2899 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
2900 expand_string_message, name);
2903 while (isspace(*s)) s++;
2905 /* {-for-text-editors */
2908 /* {-for-text-editors */
2909 expand_string_message = string_sprintf("missing } at end of condition "
2910 "inside \"%s\" group", name);
2916 if (cond_type == ECOND_AND)
2918 combined_cond &= tempcond;
2919 if (!combined_cond) subcondptr = NULL; /* once false, don't */
2920 } /* evaluate any more */
2923 combined_cond |= tempcond;
2924 if (combined_cond) subcondptr = NULL; /* once true, don't */
2925 } /* evaluate any more */
2929 if (yield != NULL) *yield = (combined_cond == testfor);
2933 /* forall/forany: iterates a condition with different values */
2938 const uschar * list;
2940 uschar *save_iterate_item = iterate_item;
2942 DEBUG(D_expand) debug_printf_indent("condition: %s\n", name);
2944 while (isspace(*s)) s++;
2945 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2946 sub[0] = expand_string_internal(s, TRUE, &s, (yield == NULL), TRUE, resetok);
2947 if (sub[0] == NULL) return NULL;
2948 /* {-for-text-editors */
2949 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2951 while (isspace(*s)) s++;
2952 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2956 /* Call eval_condition once, with result discarded (as if scanning a
2957 "false" part). This allows us to find the end of the condition, because if
2958 the list it empty, we won't actually evaluate the condition for real. */
2960 if (!(s = eval_condition(sub[1], resetok, NULL)))
2962 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2963 expand_string_message, name);
2966 while (isspace(*s)) s++;
2968 /* {-for-text-editors */
2971 /* {-for-text-editors */
2972 expand_string_message = string_sprintf("missing } at end of condition "
2973 "inside \"%s\"", name);
2977 if (yield != NULL) *yield = !testfor;
2979 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)) != NULL)
2981 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, iterate_item);
2982 if (!eval_condition(sub[1], resetok, &tempcond))
2984 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2985 expand_string_message, name);
2986 iterate_item = save_iterate_item;
2989 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", name,
2990 tempcond? "true":"false");
2992 if (yield != NULL) *yield = (tempcond == testfor);
2993 if (tempcond == (cond_type == ECOND_FORANY)) break;
2996 iterate_item = save_iterate_item;
3001 /* The bool{} expansion condition maps a string to boolean.
3002 The values supported should match those supported by the ACL condition
3003 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3004 of true/false. Note that Router "condition" rules have a different
3005 interpretation, where general data can be used and only a few values
3007 Note that readconf.c boolean matching, for boolean configuration options,
3008 only matches true/yes/false/no.
3009 The bool_lax{} condition matches the Router logic, which is much more
3012 case ECOND_BOOL_LAX:
3018 BOOL boolvalue = FALSE;
3019 while (isspace(*s)) s++;
3020 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3021 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3022 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3024 case 1: expand_string_message = string_sprintf(
3025 "too few arguments or bracketing error for %s",
3029 case 3: return NULL;
3032 while (isspace(*t)) t++;
3036 /* trailing whitespace: seems like a good idea to ignore it too */
3038 while (isspace(*t2)) t2--;
3039 if (t2 != (t + len))
3046 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3047 /* logic for the lax case from expand_check_condition(), which also does
3048 expands, and the logic is both short and stable enough that there should
3049 be no maintenance burden from replicating it. */
3053 ? Ustrspn(t+1, "0123456789") == len-1
3054 : Ustrspn(t, "0123456789") == len)
3056 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3057 /* expand_check_condition only does a literal string "0" check */
3058 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3061 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3063 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3065 else if (cond_type == ECOND_BOOL_LAX)
3069 expand_string_message = string_sprintf("unrecognised boolean "
3073 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3074 boolvalue? "true":"false");
3075 if (yield != NULL) *yield = (boolvalue == testfor);
3079 /* Unknown condition */
3082 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
3084 } /* End switch on condition type */
3086 /* Missing braces at start and end of data */
3088 COND_FAILED_CURLY_START:
3089 expand_string_message = string_sprintf("missing { after \"%s\"", name);
3092 COND_FAILED_CURLY_END:
3093 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3097 /* A condition requires code that is not compiled */
3099 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3100 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3101 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3102 COND_FAILED_NOT_COMPILED:
3103 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3112 /*************************************************
3113 * Save numerical variables *
3114 *************************************************/
3116 /* This function is called from items such as "if" that want to preserve and
3117 restore the numbered variables.
3120 save_expand_string points to an array of pointers to set
3121 save_expand_nlength points to an array of ints for the lengths
3123 Returns: the value of expand max to save
3127 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3130 for (i = 0; i <= expand_nmax; i++)
3132 save_expand_nstring[i] = expand_nstring[i];
3133 save_expand_nlength[i] = expand_nlength[i];
3140 /*************************************************
3141 * Restore numerical variables *
3142 *************************************************/
3144 /* This function restored saved values of numerical strings.
3147 save_expand_nmax the number of strings to restore
3148 save_expand_string points to an array of pointers
3149 save_expand_nlength points to an array of ints
3155 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3156 int *save_expand_nlength)
3159 expand_nmax = save_expand_nmax;
3160 for (i = 0; i <= expand_nmax; i++)
3162 expand_nstring[i] = save_expand_nstring[i];
3163 expand_nlength[i] = save_expand_nlength[i];
3171 /*************************************************
3172 * Handle yes/no substrings *
3173 *************************************************/
3175 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3176 alternative substrings that depend on whether or not the condition was true,
3177 or the lookup or extraction succeeded. The substrings always have to be
3178 expanded, to check their syntax, but "skipping" is set when the result is not
3179 needed - this avoids unnecessary nested lookups.
3182 skipping TRUE if we were skipping when this item was reached
3183 yes TRUE if the first string is to be used, else use the second
3184 save_lookup a value to put back into lookup_value before the 2nd expansion
3185 sptr points to the input string pointer
3186 yieldptr points to the output growable-string pointer
3187 type "lookup", "if", "extract", "run", "env", "listextract" or
3188 "certextract" for error message
3189 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3192 Returns: 0 OK; lookup_value has been reset to save_lookup
3194 2 expansion failed because of bracketing error
3198 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3199 gstring ** yieldptr, uschar *type, BOOL *resetok)
3202 const uschar *s = *sptr; /* Local value */
3203 uschar *sub1, *sub2;
3204 const uschar * errwhere;
3206 /* If there are no following strings, we substitute the contents of $value for
3207 lookups and for extractions in the success case. For the ${if item, the string
3208 "true" is substituted. In the fail case, nothing is substituted for all three
3211 while (isspace(*s)) s++;
3216 if (yes && !skipping)
3217 *yieldptr = string_catn(*yieldptr, US"true", 4);
3221 if (yes && lookup_value && !skipping)
3222 *yieldptr = string_cat(*yieldptr, lookup_value);
3223 lookup_value = save_lookup;
3229 /* The first following string must be braced. */
3233 errwhere = US"'yes' part did not start with '{'";
3237 /* Expand the first substring. Forced failures are noticed only if we actually
3238 want this string. Set skipping in the call in the fail case (this will always
3239 be the case if we were already skipping). */
3241 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3242 if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED;
3243 expand_string_forcedfail = FALSE;
3246 errwhere = US"'yes' part did not end with '}'";
3250 /* If we want the first string, add it to the output */
3253 *yieldptr = string_cat(*yieldptr, sub1);
3255 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3256 $value to what it was at the start of the item, so that it has this value
3257 during the second string expansion. For the call from "if" or "run" to this
3258 function, save_lookup is set to lookup_value, so that this statement does
3261 lookup_value = save_lookup;
3263 /* There now follows either another substring, or "fail", or nothing. This
3264 time, forced failures are noticed only if we want the second string. We must
3265 set skipping in the nested call if we don't want this string, or if we were
3266 already skipping. */
3268 while (isspace(*s)) s++;
3271 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3272 if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED;
3273 expand_string_forcedfail = FALSE;
3276 errwhere = US"'no' part did not start with '{'";
3280 /* If we want the second string, add it to the output */
3283 *yieldptr = string_cat(*yieldptr, sub2);
3286 /* If there is no second string, but the word "fail" is present when the use of
3287 the second string is wanted, set a flag indicating it was a forced failure
3288 rather than a syntactic error. Swallow the terminating } in case this is nested
3289 inside another lookup or if or extract. */
3294 /* deconst cast ok here as source is s anyway */
3295 s = US read_name(name, sizeof(name), s, US"_");
3296 if (Ustrcmp(name, "fail") == 0)
3298 if (!yes && !skipping)
3300 while (isspace(*s)) s++;
3303 errwhere = US"did not close with '}' after forcedfail";
3306 expand_string_message =
3307 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3308 expand_string_forcedfail = TRUE;
3314 expand_string_message =
3315 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3320 /* All we have to do now is to check on the final closing brace. */
3322 while (isspace(*s)) s++;
3325 errwhere = US"did not close with '}'";
3331 /* Update the input pointer value before returning */
3336 /* Get here if there is a bracketing failure */
3337 expand_string_message = string_sprintf(
3338 "curly-bracket problem in conditional yes/no parsing: %s\n"
3339 " remaining string is '%s'", errwhere, --s);
3344 /* Get here for other failures */
3352 /*************************************************
3353 * Handle MD5 or SHA-1 computation for HMAC *
3354 *************************************************/
3356 /* These are some wrapping functions that enable the HMAC code to be a bit
3357 cleaner. A good compiler will spot the tail recursion.
3360 type HMAC_MD5 or HMAC_SHA1
3361 remaining are as for the cryptographic hash functions
3367 chash_start(int type, void *base)
3369 if (type == HMAC_MD5)
3370 md5_start((md5 *)base);
3372 sha1_start((hctx *)base);
3376 chash_mid(int type, void *base, uschar *string)
3378 if (type == HMAC_MD5)
3379 md5_mid((md5 *)base, string);
3381 sha1_mid((hctx *)base, string);
3385 chash_end(int type, void *base, uschar *string, int length, uschar *digest)
3387 if (type == HMAC_MD5)
3388 md5_end((md5 *)base, string, length, digest);
3390 sha1_end((hctx *)base, string, length, digest);
3397 /********************************************************
3398 * prvs: Get last three digits of days since Jan 1, 1970 *
3399 ********************************************************/
3401 /* This is needed to implement the "prvs" BATV reverse
3404 Argument: integer "days" offset to add or substract to
3405 or from the current number of days.
3407 Returns: pointer to string containing the last three
3408 digits of the number of days since Jan 1, 1970,
3409 modified by the offset argument, NULL if there
3410 was an error in the conversion.
3415 prvs_daystamp(int day_offset)
3417 uschar *days = store_get(32); /* Need at least 24 for cases */
3418 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3419 (time(NULL) + day_offset*86400)/86400);
3420 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3425 /********************************************************
3426 * prvs: perform HMAC-SHA1 computation of prvs bits *
3427 ********************************************************/
3429 /* This is needed to implement the "prvs" BATV reverse
3433 address RFC2821 Address to use
3434 key The key to use (must be less than 64 characters
3436 key_num Single-digit key number to use. Defaults to
3439 Returns: pointer to string containing the first three
3440 bytes of the final hash in hex format, NULL if
3441 there was an error in the process.
3445 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3447 gstring * hash_source;
3451 uschar innerhash[20];
3452 uschar finalhash[20];
3453 uschar innerkey[64];
3454 uschar outerkey[64];
3455 uschar *finalhash_hex = store_get(40);
3457 if (key_num == NULL)
3460 if (Ustrlen(key) > 64)
3463 hash_source = string_catn(NULL, key_num, 1);
3464 hash_source = string_catn(hash_source, daystamp, 3);
3465 hash_source = string_cat(hash_source, address);
3466 (void) string_from_gstring(hash_source);
3469 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3471 memset(innerkey, 0x36, 64);
3472 memset(outerkey, 0x5c, 64);
3474 for (i = 0; i < Ustrlen(key); i++)
3476 innerkey[i] ^= key[i];
3477 outerkey[i] ^= key[i];
3480 chash_start(HMAC_SHA1, &h);
3481 chash_mid(HMAC_SHA1, &h, innerkey);
3482 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3484 chash_start(HMAC_SHA1, &h);
3485 chash_mid(HMAC_SHA1, &h, outerkey);
3486 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3489 for (i = 0; i < 3; i++)
3491 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3492 *p++ = hex_digits[finalhash[i] & 0x0f];
3496 return finalhash_hex;
3502 /*************************************************
3503 * Join a file onto the output string *
3504 *************************************************/
3506 /* This is used for readfile/readsock and after a run expansion.
3507 It joins the contents of a file onto the output string, globally replacing
3508 newlines with a given string (optionally).
3512 yield pointer to the expandable string struct
3513 eol newline replacement string, or NULL
3515 Returns: new pointer for expandable string, terminated if non-null
3519 cat_file(FILE *f, gstring *yield, uschar *eol)
3521 uschar buffer[1024];
3523 while (Ufgets(buffer, sizeof(buffer), f))
3525 int len = Ustrlen(buffer);
3526 if (eol && buffer[len-1] == '\n') len--;
3527 yield = string_catn(yield, buffer, len);
3528 if (eol && buffer[len])
3529 yield = string_cat(yield, eol);
3532 (void) string_from_gstring(yield);
3539 /*************************************************
3540 * Evaluate numeric expression *
3541 *************************************************/
3543 /* This is a set of mutually recursive functions that evaluate an arithmetic
3544 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3545 these functions that is called from elsewhere is eval_expr, whose interface is:
3548 sptr pointer to the pointer to the string - gets updated
3549 decimal TRUE if numbers are to be assumed decimal
3550 error pointer to where to put an error message - must be NULL on input
3551 endket TRUE if ')' must terminate - FALSE for external call
3553 Returns: on success: the value of the expression, with *error still NULL
3554 on failure: an undefined value, with *error = a message
3557 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3560 static int_eximarith_t
3561 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3564 int_eximarith_t x = eval_op_or(&s, decimal, error);
3570 *error = US"expecting closing parenthesis";
3572 while (isspace(*(++s)));
3574 else if (*s != 0) *error = US"expecting operator";
3581 static int_eximarith_t
3582 eval_number(uschar **sptr, BOOL decimal, uschar **error)
3587 while (isspace(*s)) s++;
3592 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
3594 switch (tolower(*s))
3597 case 'k': n *= 1024; s++; break;
3598 case 'm': n *= 1024*1024; s++; break;
3599 case 'g': n *= 1024*1024*1024; s++; break;
3601 while (isspace (*s)) s++;
3606 n = eval_expr(&s, decimal, error, 1);
3610 *error = US"expecting number or opening parenthesis";
3618 static int_eximarith_t
3619 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
3623 while (isspace(*s)) s++;
3624 if (*s == '+' || *s == '-' || *s == '~')
3627 x = eval_op_unary(&s, decimal, error);
3628 if (op == '-') x = -x;
3629 else if (op == '~') x = ~x;
3633 x = eval_number(&s, decimal, error);
3640 static int_eximarith_t
3641 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
3644 int_eximarith_t x = eval_op_unary(&s, decimal, error);
3647 while (*s == '*' || *s == '/' || *s == '%')
3650 int_eximarith_t y = eval_op_unary(&s, decimal, error);
3651 if (*error != NULL) break;
3652 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
3653 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
3654 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
3655 * -N*M is INT_MIN will yield INT_MIN.
3656 * Since we don't support floating point, this is somewhat simpler.
3657 * Ideally, we'd return an error, but since we overflow for all other
3658 * arithmetic, consistency suggests otherwise, but what's the correct value
3659 * to use? There is none.
3660 * The C standard guarantees overflow for unsigned arithmetic but signed
3661 * overflow invokes undefined behaviour; in practice, this is overflow
3662 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
3663 * that long/longlong larger than int are available, or we could just work
3664 * with larger types. We should consider whether to guarantee 32bit eval
3665 * and 64-bit working variables, with errors returned. For now ...
3666 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
3667 * can just let the other invalid results occur otherwise, as they have
3668 * until now. For this one case, we can coerce.
3670 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
3673 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
3674 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
3684 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
3700 static int_eximarith_t
3701 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
3704 int_eximarith_t x = eval_op_mult(&s, decimal, error);
3707 while (*s == '+' || *s == '-')
3710 int_eximarith_t y = eval_op_mult(&s, decimal, error);
3712 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
3713 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
3714 { /* over-conservative check */
3716 ? US"overflow in sum" : US"overflow in difference";
3719 if (op == '+') x += y; else x -= y;
3727 static int_eximarith_t
3728 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
3731 int_eximarith_t x = eval_op_sum(&s, decimal, error);
3734 while ((*s == '<' || *s == '>') && s[1] == s[0])
3739 y = eval_op_sum(&s, decimal, error);
3740 if (*error != NULL) break;
3741 if (op == '<') x <<= y; else x >>= y;
3749 static int_eximarith_t
3750 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
3753 int_eximarith_t x = eval_op_shift(&s, decimal, error);
3760 y = eval_op_shift(&s, decimal, error);
3761 if (*error != NULL) break;
3770 static int_eximarith_t
3771 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
3774 int_eximarith_t x = eval_op_and(&s, decimal, error);
3781 y = eval_op_and(&s, decimal, error);
3782 if (*error != NULL) break;
3791 static int_eximarith_t
3792 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
3795 int_eximarith_t x = eval_op_xor(&s, decimal, error);
3802 y = eval_op_xor(&s, decimal, error);
3803 if (*error != NULL) break;
3813 /*************************************************
3815 *************************************************/
3817 /* Returns either an unchanged string, or the expanded string in stacking pool
3818 store. Interpreted sequences are:
3820 \... normal escaping rules
3821 $name substitutes the variable
3823 ${op:string} operates on the expanded string value
3824 ${item{arg1}{arg2}...} expands the args and then does the business
3825 some literal args are not enclosed in {}
3827 There are now far too many operators and item types to make it worth listing
3828 them here in detail any more.
3830 We use an internal routine recursively to handle embedded substrings. The
3831 external function follows. The yield is NULL if the expansion failed, and there
3832 are two cases: if something collapsed syntactically, or if "fail" was given
3833 as the action on a lookup failure. These can be distinguished by looking at the
3834 variable expand_string_forcedfail, which is TRUE in the latter case.
3836 The skipping flag is set true when expanding a substring that isn't actually
3837 going to be used (after "if" or "lookup") and it prevents lookups from
3838 happening lower down.
3840 Store usage: At start, a store block of the length of the input plus 64
3841 is obtained. This is expanded as necessary by string_cat(), which might have to
3842 get a new block, or might be able to expand the original. At the end of the
3843 function we can release any store above that portion of the yield block that
3844 was actually used. In many cases this will be optimal.
3846 However: if the first item in the expansion is a variable name or header name,
3847 we reset the store before processing it; if the result is in fresh store, we
3848 use that without copying. This is helpful for expanding strings like
3849 $message_headers which can get very long.
3851 There's a problem if a ${dlfunc item has side-effects that cause allocation,
3852 since resetting the store at the end of the expansion will free store that was
3853 allocated by the plugin code as well as the slop after the expanded string. So
3854 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
3855 and, given the acl condition, ${if }. This is an unfortunate consequence of
3856 string expansion becoming too powerful.
3859 string the string to be expanded
3860 ket_ends true if expansion is to stop at }
3861 left if not NULL, a pointer to the first character after the
3862 expansion is placed here (typically used with ket_ends)
3863 skipping TRUE for recursive calls when the value isn't actually going
3864 to be used (to allow for optimisation)
3865 honour_dollar TRUE if $ is to be expanded,
3866 FALSE if it's just another character
3867 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
3870 Returns: NULL if expansion fails:
3871 expand_string_forcedfail is set TRUE if failure was forced
3872 expand_string_message contains a textual error message
3873 a pointer to the expanded string on success
3877 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
3878 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
3880 gstring * yield = string_get(Ustrlen(string) + 64);
3882 const uschar *s = string;
3883 uschar *save_expand_nstring[EXPAND_MAXN+1];
3884 int save_expand_nlength[EXPAND_MAXN+1];
3885 BOOL resetok = TRUE;
3889 debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n",
3891 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
3895 expand_string_forcedfail = FALSE;
3896 expand_string_message = US"";
3903 /* \ escapes the next character, which must exist, or else
3904 the expansion fails. There's a special escape, \N, which causes
3905 copying of the subject verbatim up to the next \N. Otherwise,
3906 the escapes are the standard set. */
3912 expand_string_message = US"\\ at end of string";
3918 const uschar * t = s + 2;
3919 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
3920 yield = string_catn(yield, t, s - t);
3921 if (*s != 0) s += 2;
3927 ch[0] = string_interpret_escape(&s);
3929 yield = string_catn(yield, ch, 1);
3936 /* Anything other than $ is just copied verbatim, unless we are
3937 looking for a terminating } character. */
3940 if (ket_ends && *s == '}') break;
3942 if (*s != '$' || !honour_dollar)
3944 yield = string_catn(yield, s++, 1);
3948 /* No { after the $ - must be a plain name or a number for string
3949 match variable. There has to be a fudge for variables that are the
3950 names of header fields preceded by "$header_" because header field
3951 names can contain any printing characters except space and colon.
3952 For those that don't like typing this much, "$h_" is a synonym for
3953 "$header_". A non-existent header yields a NULL value; nothing is
3956 if (isalpha((*(++s))))
3962 s = read_name(name, sizeof(name), s, US"_");
3964 /* If this is the first thing to be expanded, release the pre-allocated
3968 g = store_get(sizeof(gstring));
3969 else if (yield->ptr == 0)
3971 if (resetok) store_reset(yield);
3973 g = store_get(sizeof(gstring)); /* alloc _before_ calling find_variable() */
3978 if (Ustrncmp(name, "h_", 2) == 0 ||
3979 Ustrncmp(name, "rh_", 3) == 0 ||
3980 Ustrncmp(name, "bh_", 3) == 0 ||
3981 Ustrncmp(name, "header_", 7) == 0 ||
3982 Ustrncmp(name, "rheader_", 8) == 0 ||
3983 Ustrncmp(name, "bheader_", 8) == 0)
3985 BOOL want_raw = (name[0] == 'r')? TRUE : FALSE;
3986 uschar *charset = (name[0] == 'b')? NULL : headers_charset;
3987 s = read_header_name(name, sizeof(name), s);
3988 value = find_header(name, FALSE, &newsize, want_raw, charset);
3990 /* If we didn't find the header, and the header contains a closing brace
3991 character, this may be a user error where the terminating colon
3992 has been omitted. Set a flag to adjust the error message in this case.
3993 But there is no error here - nothing gets inserted. */
3997 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
4004 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4006 expand_string_message =
4007 string_sprintf("unknown variable name \"%s\"", name);
4008 check_variable_error_message(name);
4012 /* If the data is known to be in a new buffer, newsize will be set to the
4013 size of that buffer. If this is the first thing in an expansion string,
4014 yield will be NULL; just point it at the new store instead of copying. Many
4015 expansion strings contain just one reference, so this is a useful
4016 optimization, especially for humungous headers. We need to use a gstring
4017 structure that is not allocated after that new-buffer, else a later store
4018 reset in the middle of the buffer will make it inaccessible. */
4020 len = Ustrlen(value);
4021 if (!yield && newsize != 0)
4024 yield->size = newsize;
4029 yield = string_catn(yield, value, len);
4037 s = read_cnumber(&n, s);
4038 if (n >= 0 && n <= expand_nmax)
4039 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4043 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4045 if (*s != '{') /*}*/
4047 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4051 /* After { there can be various things, but they all start with
4052 an initial word, except for a number for a string match variable. */
4054 if (isdigit((*(++s))))
4057 s = read_cnumber(&n, s); /*{*/
4060 expand_string_message = US"} expected after number";
4063 if (n >= 0 && n <= expand_nmax)
4064 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4070 expand_string_message = US"letter or digit expected after ${"; /*}*/
4074 /* Allow "-" in names to cater for substrings with negative
4075 arguments. Since we are checking for known names after { this is
4078 s = read_name(name, sizeof(name), s, US"_-");
4079 item_type = chop_match(name, item_table, nelem(item_table));
4083 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4084 If the ACL returns accept or reject we return content set by "message ="
4085 There is currently no limit on recursion; this would have us call
4086 acl_check_internal() directly and get a current level from somewhere.
4087 See also the acl expansion condition ECOND_ACL and the traditional
4088 acl modifier ACLC_ACL.
4089 Assume that the function has side-effects on the store that must be preserved.
4093 /* ${acl {name} {arg1}{arg2}...} */
4095 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4098 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, US"acl",
4101 case 1: goto EXPAND_FAILED_CURLY;
4103 case 3: goto EXPAND_FAILED;
4105 if (skipping) continue;
4108 switch(eval_acl(sub, nelem(sub), &user_msg))
4113 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4115 yield = string_cat(yield, user_msg);
4119 expand_string_forcedfail = TRUE;
4122 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
4127 case EITEM_AUTHRESULTS:
4128 /* ${authresults {mysystemname}} */
4132 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4135 case 1: goto EXPAND_FAILED_CURLY;
4137 case 3: goto EXPAND_FAILED;
4140 yield = string_append(yield, 3,
4141 US"Authentication-Results: ", sub_arg[0], US"; none");
4144 yield = authres_iprev(yield);
4145 yield = authres_smtpauth(yield);
4147 yield = authres_spf(yield);
4149 #ifndef DISABLE_DKIM
4150 yield = authres_dkim(yield);
4152 #ifdef EXPERIMENTAL_ARC
4153 yield = authres_arc(yield);
4158 /* Handle conditionals - preserve the values of the numerical expansion
4159 variables in case they get changed by a regular expression match in the
4160 condition. If not, they retain their external settings. At the end
4161 of this "if" section, they get restored to their previous values. */
4166 const uschar *next_s;
4167 int save_expand_nmax =
4168 save_expand_strings(save_expand_nstring, save_expand_nlength);
4170 while (isspace(*s)) s++;
4171 next_s = eval_condition(s, &resetok, skipping ? NULL : &cond);
4172 if (next_s == NULL) goto EXPAND_FAILED; /* message already set */
4176 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4177 "condition: %.*s\n",
4178 (int)(next_s - s), s);
4179 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4180 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
4182 cond ? "true" : "false");
4187 /* The handling of "yes" and "no" result strings is now in a separate
4188 function that is also used by ${lookup} and ${extract} and ${run}. */
4190 switch(process_yesno(
4191 skipping, /* were previously skipping */
4192 cond, /* success/failure indicator */
4193 lookup_value, /* value to reset for string2 */
4194 &s, /* input pointer */
4195 &yield, /* output pointer */
4196 US"if", /* condition type */
4199 case 1: goto EXPAND_FAILED; /* when all is well, the */
4200 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4203 /* Restore external setting of expansion variables for continuation
4206 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4207 save_expand_nlength);
4212 case EITEM_IMAPFOLDER:
4213 { /* ${imapfolder {name}{sep]{specials}} */
4217 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4220 case 1: goto EXPAND_FAILED_CURLY;
4222 case 3: goto EXPAND_FAILED;
4225 if (sub_arg[1] == NULL) /* One argument */
4227 sub_arg[1] = US"/"; /* default separator */
4230 else if (Ustrlen(sub_arg[1]) != 1)
4232 expand_string_message =
4234 "IMAP folder separator must be one character, found \"%s\"",
4241 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4242 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4244 yield = string_cat(yield, encoded);
4250 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4251 expanding an internal string that isn't actually going to be used. All we
4252 need to do is check the syntax, so don't do a lookup at all. Preserve the
4253 values of the numerical expansion variables in case they get changed by a
4254 partial lookup. If not, they retain their external settings. At the end
4255 of this "lookup" section, they get restored to their previous values. */
4259 int stype, partial, affixlen, starflags;
4260 int expand_setup = 0;
4262 uschar *key, *filename;
4263 const uschar *affix;
4264 uschar *save_lookup_value = lookup_value;
4265 int save_expand_nmax =
4266 save_expand_strings(save_expand_nstring, save_expand_nlength);
4268 if ((expand_forbid & RDO_LOOKUP) != 0)
4270 expand_string_message = US"lookup expansions are not permitted";
4274 /* Get the key we are to look up for single-key+file style lookups.
4275 Otherwise set the key NULL pro-tem. */
4277 while (isspace(*s)) s++;
4278 if (*s == '{') /*}*/
4280 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4281 if (!key) goto EXPAND_FAILED; /*{{*/
4284 expand_string_message = US"missing '}' after lookup key";
4285 goto EXPAND_FAILED_CURLY;
4287 while (isspace(*s)) s++;
4291 /* Find out the type of database */
4295 expand_string_message = US"missing lookup type";
4299 /* The type is a string that may contain special characters of various
4300 kinds. Allow everything except space or { to appear; the actual content
4301 is checked by search_findtype_partial. */ /*}*/
4303 while (*s != 0 && *s != '{' && !isspace(*s)) /*}*/
4305 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4309 while (isspace(*s)) s++;
4311 /* Now check for the individual search type and any partial or default
4312 options. Only those types that are actually in the binary are valid. */
4314 stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4318 expand_string_message = search_error_message;
4322 /* Check that a key was provided for those lookup types that need it,
4323 and was not supplied for those that use the query style. */
4325 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4329 expand_string_message = string_sprintf("missing {key} for single-"
4330 "key \"%s\" lookup", name);
4338 expand_string_message = string_sprintf("a single key was given for "
4339 "lookup type \"%s\", which is not a single-key lookup type", name);
4344 /* Get the next string in brackets and expand it. It is the file name for
4345 single-key+file lookups, and the whole query otherwise. In the case of
4346 queries that also require a file name (e.g. sqlite), the file name comes
4351 expand_string_message = US"missing '{' for lookup file-or-query arg";
4352 goto EXPAND_FAILED_CURLY;
4354 filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4355 if (filename == NULL) goto EXPAND_FAILED;
4358 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4359 goto EXPAND_FAILED_CURLY;
4361 while (isspace(*s)) s++;
4363 /* If this isn't a single-key+file lookup, re-arrange the variables
4364 to be appropriate for the search_ functions. For query-style lookups,
4365 there is just a "key", and no file name. For the special query-style +
4366 file types, the query (i.e. "key") starts with a file name. */
4370 while (isspace(*filename)) filename++;
4373 if (mac_islookup(stype, lookup_querystyle))
4377 if (*filename != '/')
4379 expand_string_message = string_sprintf(
4380 "absolute file name expected for \"%s\" lookup", name);
4383 while (*key != 0 && !isspace(*key)) key++;
4384 if (*key != 0) *key++ = 0;
4388 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4389 the entry was not found. Note that there is no search_close() function.
4390 Files are left open in case of re-use. At suitable places in higher logic,
4391 search_tidyup() is called to tidy all open files. This can save opening
4392 the same file several times. However, files may also get closed when
4393 others are opened, if too many are open at once. The rule is that a
4394 handle should not be used after a second search_open().
4396 Request that a partial search sets up $1 and maybe $2 by passing
4397 expand_setup containing zero. If its value changes, reset expand_nmax,
4398 since new variables will have been set. Note that at the end of this
4399 "lookup" section, the old numeric variables are restored. */
4402 lookup_value = NULL;
4405 void *handle = search_open(filename, stype, 0, NULL, NULL);
4408 expand_string_message = search_error_message;
4411 lookup_value = search_find(handle, filename, key, partial, affix,
4412 affixlen, starflags, &expand_setup);
4413 if (search_find_defer)
4415 expand_string_message =
4416 string_sprintf("lookup of \"%s\" gave DEFER: %s",
4417 string_printing2(key, FALSE), search_error_message);
4420 if (expand_setup > 0) expand_nmax = expand_setup;
4423 /* The handling of "yes" and "no" result strings is now in a separate
4424 function that is also used by ${if} and ${extract}. */
4426 switch(process_yesno(
4427 skipping, /* were previously skipping */
4428 lookup_value != NULL, /* success/failure indicator */
4429 save_lookup_value, /* value to reset for string2 */
4430 &s, /* input pointer */
4431 &yield, /* output pointer */
4432 US"lookup", /* condition type */
4435 case 1: goto EXPAND_FAILED; /* when all is well, the */
4436 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4439 /* Restore external setting of expansion variables for carrying on
4440 at this level, and continue. */
4442 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4443 save_expand_nlength);
4447 /* If Perl support is configured, handle calling embedded perl subroutines,
4448 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
4449 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
4450 arguments (defined below). */
4452 #define EXIM_PERL_MAX_ARGS 8
4456 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
4457 "is not included in this binary";
4460 #else /* EXIM_PERL */
4462 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
4465 if ((expand_forbid & RDO_PERL) != 0)
4467 expand_string_message = US"Perl calls are not permitted";
4471 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
4472 US"perl", &resetok))
4474 case 1: goto EXPAND_FAILED_CURLY;
4476 case 3: goto EXPAND_FAILED;
4479 /* If skipping, we don't actually do anything */
4481 if (skipping) continue;
4483 /* Start the interpreter if necessary */
4485 if (!opt_perl_started)
4488 if (opt_perl_startup == NULL)
4490 expand_string_message = US"A setting of perl_startup is needed when "
4491 "using the Perl interpreter";
4494 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4495 initerror = init_perl(opt_perl_startup);
4496 if (initerror != NULL)
4498 expand_string_message =
4499 string_sprintf("error in perl_startup code: %s\n", initerror);
4502 opt_perl_started = TRUE;
4505 /* Call the function */
4507 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
4508 new_yield = call_perl_cat(yield, &expand_string_message,
4509 sub_arg[0], sub_arg + 1);
4511 /* NULL yield indicates failure; if the message pointer has been set to
4512 NULL, the yield was undef, indicating a forced failure. Otherwise the
4513 message will indicate some kind of Perl error. */
4515 if (new_yield == NULL)
4517 if (expand_string_message == NULL)
4519 expand_string_message =
4520 string_sprintf("Perl subroutine \"%s\" returned undef to force "
4521 "failure", sub_arg[0]);
4522 expand_string_forcedfail = TRUE;
4527 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
4528 set during a callback from Perl. */
4530 expand_string_forcedfail = FALSE;
4534 #endif /* EXIM_PERL */
4536 /* Transform email address to "prvs" scheme to use
4537 as BATV-signed return path */
4544 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, US"prvs", &resetok))
4546 case 1: goto EXPAND_FAILED_CURLY;
4548 case 3: goto EXPAND_FAILED;
4551 /* If skipping, we don't actually do anything */
4552 if (skipping) continue;
4554 /* sub_arg[0] is the address */
4555 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
4556 || domain == sub_arg[0] || Ustrlen(domain) == 1)
4558 expand_string_message = US"prvs first argument must be a qualified email address";
4562 /* Calculate the hash. The third argument must be a single-digit
4563 key number, or unset. */
4566 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
4568 expand_string_message = US"prvs third argument must be a single digit";
4572 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
4575 expand_string_message = US"prvs hmac-sha1 conversion failed";
4579 /* Now separate the domain from the local part */
4582 yield = string_catn(yield, US"prvs=", 5);
4583 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
4584 yield = string_catn(yield, prvs_daystamp(7), 3);
4585 yield = string_catn(yield, p, 6);
4586 yield = string_catn(yield, US"=", 1);
4587 yield = string_cat (yield, sub_arg[0]);
4588 yield = string_catn(yield, US"@", 1);
4589 yield = string_cat (yield, domain);
4594 /* Check a prvs-encoded address for validity */
4596 case EITEM_PRVSCHECK:
4603 /* TF: Ugliness: We want to expand parameter 1 first, then set
4604 up expansion variables that are used in the expansion of
4605 parameter 2. So we clone the string for the first
4606 expansion, where we only expand parameter 1.
4608 PH: Actually, that isn't necessary. The read_subs() function is
4609 designed to work this way for the ${if and ${lookup expansions. I've
4613 /* Reset expansion variables */
4614 prvscheck_result = NULL;
4615 prvscheck_address = NULL;
4616 prvscheck_keynum = NULL;
4618 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok))
4620 case 1: goto EXPAND_FAILED_CURLY;
4622 case 3: goto EXPAND_FAILED;
4625 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
4628 if (regex_match_and_setup(re,sub_arg[0],0,-1))
4630 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
4631 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
4632 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
4633 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
4634 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
4636 DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part);
4637 DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num);
4638 DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
4639 DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash);
4640 DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain);
4642 /* Set up expansion variables */
4643 g = string_cat (NULL, local_part);
4644 g = string_catn(g, US"@", 1);
4645 g = string_cat (g, domain);
4646 prvscheck_address = string_from_gstring(g);
4647 prvscheck_keynum = string_copy(key_num);
4649 /* Now expand the second argument */
4650 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok))
4652 case 1: goto EXPAND_FAILED_CURLY;
4654 case 3: goto EXPAND_FAILED;
4657 /* Now we have the key and can check the address. */
4659 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
4664 expand_string_message = US"hmac-sha1 conversion failed";
4668 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
4669 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
4671 if (Ustrcmp(p,hash) == 0)
4673 /* Success, valid BATV address. Now check the expiry date. */
4674 uschar *now = prvs_daystamp(0);
4675 unsigned int inow = 0,iexpire = 1;
4677 (void)sscanf(CS now,"%u",&inow);
4678 (void)sscanf(CS daystamp,"%u",&iexpire);
4680 /* When "iexpire" is < 7, a "flip" has occured.
4681 Adjust "inow" accordingly. */
4682 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
4684 if (iexpire >= inow)
4686 prvscheck_result = US"1";
4687 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
4691 prvscheck_result = NULL;
4692 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
4697 prvscheck_result = NULL;
4698 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
4701 /* Now expand the final argument. We leave this till now so that
4702 it can include $prvscheck_result. */
4704 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, US"prvs", &resetok))
4706 case 1: goto EXPAND_FAILED_CURLY;
4708 case 3: goto EXPAND_FAILED;
4711 yield = string_cat(yield,
4712 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
4714 /* Reset the "internal" variables afterwards, because they are in
4715 dynamic store that will be reclaimed if the expansion succeeded. */
4717 prvscheck_address = NULL;
4718 prvscheck_keynum = NULL;
4721 /* Does not look like a prvs encoded address, return the empty string.
4722 We need to make sure all subs are expanded first, so as to skip over
4725 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"prvs", &resetok))
4727 case 1: goto EXPAND_FAILED_CURLY;
4729 case 3: goto EXPAND_FAILED;
4735 /* Handle "readfile" to insert an entire file */
4737 case EITEM_READFILE:
4742 if ((expand_forbid & RDO_READFILE) != 0)
4744 expand_string_message = US"file insertions are not permitted";
4748 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile", &resetok))
4750 case 1: goto EXPAND_FAILED_CURLY;
4752 case 3: goto EXPAND_FAILED;
4755 /* If skipping, we don't actually do anything */
4757 if (skipping) continue;
4759 /* Open the file and read it */
4761 if (!(f = Ufopen(sub_arg[0], "rb")))
4763 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
4767 yield = cat_file(f, yield, sub_arg[1]);
4772 /* Handle "readsocket" to insert data from a socket, either
4773 Inet or Unix domain */
4775 case EITEM_READSOCK:
4779 int save_ptr = yield->ptr;
4783 BOOL do_shutdown = TRUE;
4786 if (expand_forbid & RDO_READSOCK)
4788 expand_string_message = US"socket insertions are not permitted";
4792 /* Read up to 4 arguments, but don't do the end of item check afterwards,
4793 because there may be a string for expansion on failure. */
4795 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket", &resetok))
4797 case 1: goto EXPAND_FAILED_CURLY;
4798 case 2: /* Won't occur: no end check */
4799 case 3: goto EXPAND_FAILED;
4802 /* Grab the request string, if any */
4804 reqstr.data = sub_arg[1];
4805 reqstr.len = Ustrlen(sub_arg[1]);
4807 /* Sort out timeout, if given. The second arg is a list with the first element
4808 being a time value. Any more are options of form "name=value". Currently the
4809 only option recognised is "shutdown". */
4813 const uschar * list = sub_arg[2];
4817 item = string_nextinlist(&list, &sep, NULL, 0);
4818 if ((timeout = readconf_readtime(item, 0, FALSE)) < 0)
4820 expand_string_message = string_sprintf("bad time value %s", item);
4824 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
4825 if (Ustrncmp(item, US"shutdown=", 9) == 0)
4826 if (Ustrcmp(item + 9, US"no") == 0)
4827 do_shutdown = FALSE;
4829 else sub_arg[3] = NULL; /* No eol if no timeout */
4831 /* If skipping, we don't actually do anything. Otherwise, arrange to
4832 connect to either an IP or a Unix socket. */
4836 /* Handle an IP (internet) domain */
4838 if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
4841 uschar * server_name = sub_arg[0] + 5;
4842 uschar * port_name = Ustrrchr(server_name, ':');
4844 /* Sort out the port */
4848 expand_string_message =
4849 string_sprintf("missing port for readsocket %s", sub_arg[0]);
4852 *port_name++ = 0; /* Terminate server name */
4854 if (isdigit(*port_name))
4857 port = Ustrtol(port_name, &end, 0);
4858 if (end != port_name + Ustrlen(port_name))
4860 expand_string_message =
4861 string_sprintf("invalid port number %s", port_name);
4867 struct servent *service_info = getservbyname(CS port_name, "tcp");
4870 expand_string_message = string_sprintf("unknown port \"%s\"",
4874 port = ntohs(service_info->s_port);
4877 fd = ip_connectedsocket(SOCK_STREAM, server_name, port, port,
4878 timeout, NULL, &expand_string_message, &reqstr);
4879 callout_address = NULL;
4885 /* Handle a Unix domain socket */
4889 struct sockaddr_un sockun; /* don't call this "sun" ! */
4892 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
4894 expand_string_message = string_sprintf("failed to create socket: %s",
4899 sockun.sun_family = AF_UNIX;
4900 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
4903 sigalrm_seen = FALSE;
4905 rc = connect(fd, (struct sockaddr *)(&sockun), sizeof(sockun));
4909 expand_string_message = US "socket connect timed out";
4914 expand_string_message = string_sprintf("failed to connect to socket "
4915 "%s: %s", sub_arg[0], strerror(errno));
4920 DEBUG(D_expand) debug_printf_indent("connected to socket %s\n", sub_arg[0]);
4922 /* Allow sequencing of test actions */
4923 if (running_in_test_harness) millisleep(100);
4925 /* Write the request string, if not empty or already done */
4929 DEBUG(D_expand) debug_printf_indent("writing \"%s\" to socket\n",
4931 if (write(fd, reqstr.data, reqstr.len) != reqstr.len)
4933 expand_string_message = string_sprintf("request write to socket "
4934 "failed: %s", strerror(errno));
4939 /* Shut down the sending side of the socket. This helps some servers to
4940 recognise that it is their turn to do some work. Just in case some
4941 system doesn't have this function, make it conditional. */
4944 if (do_shutdown) shutdown(fd, SHUT_WR);
4947 if (running_in_test_harness) millisleep(100);
4949 /* Now we need to read from the socket, under a timeout. The function
4950 that reads a file can be used. */
4952 f = fdopen(fd, "rb");
4953 sigalrm_seen = FALSE;
4955 yield = cat_file(f, yield, sub_arg[3]);
4959 /* After a timeout, we restore the pointer in the result, that is,
4960 make sure we add nothing from the socket. */
4964 yield->ptr = save_ptr;
4965 expand_string_message = US "socket read timed out";
4970 /* The whole thing has worked (or we were skipping). If there is a
4971 failure string following, we need to skip it. */
4975 if (expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok) == NULL)
4979 expand_string_message = US"missing '}' closing failstring for readsocket";
4980 goto EXPAND_FAILED_CURLY;
4982 while (isspace(*s)) s++;
4988 expand_string_message = US"missing '}' closing readsocket";
4989 goto EXPAND_FAILED_CURLY;
4993 /* Come here on failure to create socket, connect socket, write to the
4994 socket, or timeout on reading. If another substring follows, expand and
4995 use it. Otherwise, those conditions give expand errors. */
4998 if (*s != '{') goto EXPAND_FAILED;
4999 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5000 if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok)))
5002 yield = string_cat(yield, arg);
5005 expand_string_message = US"missing '}' closing failstring for readsocket";
5006 goto EXPAND_FAILED_CURLY;
5008 while (isspace(*s)) s++;
5012 /* Handle "run" to execute a program. */
5018 const uschar **argv;
5022 if ((expand_forbid & RDO_RUN) != 0)
5024 expand_string_message = US"running a command is not permitted";
5028 while (isspace(*s)) s++;
5031 expand_string_message = US"missing '{' for command arg of run";
5032 goto EXPAND_FAILED_CURLY;
5034 arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5035 if (arg == NULL) goto EXPAND_FAILED;
5036 while (isspace(*s)) s++;
5039 expand_string_message = US"missing '}' closing command arg of run";
5040 goto EXPAND_FAILED_CURLY;
5043 if (skipping) /* Just pretend it worked when we're skipping */
5046 lookup_value = NULL;
5050 if (!transport_set_up_command(&argv, /* anchor for arg list */
5051 arg, /* raw command */
5052 FALSE, /* don't expand the arguments */
5053 0, /* not relevant when... */
5054 NULL, /* no transporting address */
5055 US"${run} expansion", /* for error messages */
5056 &expand_string_message)) /* where to put error message */
5059 /* Create the child process, making it a group leader. */
5061 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE)) < 0)
5063 expand_string_message =
5064 string_sprintf("couldn't create child process: %s", strerror(errno));
5068 /* Nothing is written to the standard input. */
5072 /* Read the pipe to get the command's output into $value (which is kept
5073 in lookup_value). Read during execution, so that if the output exceeds
5074 the OS pipe buffer limit, we don't block forever. Remember to not release
5075 memory just allocated for $value. */
5078 f = fdopen(fd_out, "rb");
5079 sigalrm_seen = FALSE;
5081 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5085 /* Wait for the process to finish, applying the timeout, and inspect its
5086 return code for serious disasters. Simple non-zero returns are passed on.
5089 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5091 if (sigalrm_seen || runrc == -256)
5093 expand_string_message = string_sprintf("command timed out");
5094 killpg(pid, SIGKILL); /* Kill the whole process group */
5097 else if (runrc == -257)
5098 expand_string_message = string_sprintf("wait() failed: %s",
5102 expand_string_message = string_sprintf("command killed by signal %d",
5109 /* Process the yes/no strings; $value may be useful in both cases */
5111 switch(process_yesno(
5112 skipping, /* were previously skipping */
5113 runrc == 0, /* success/failure indicator */
5114 lookup_value, /* value to reset for string2 */
5115 &s, /* input pointer */
5116 &yield, /* output pointer */
5117 US"run", /* condition type */
5120 case 1: goto EXPAND_FAILED; /* when all is well, the */
5121 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5127 /* Handle character translation for "tr" */
5131 int oldptr = yield->ptr;
5135 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr", &resetok))
5137 case 1: goto EXPAND_FAILED_CURLY;
5139 case 3: goto EXPAND_FAILED;
5142 yield = string_cat(yield, sub[0]);
5143 o2m = Ustrlen(sub[2]) - 1;
5145 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5147 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5151 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5158 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5159 expanded arguments. */
5169 int val[2] = { 0, -1 };
5172 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5173 Ensure that sub[2] is set in the ${length } case. */
5176 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5177 TRUE, name, &resetok))
5179 case 1: goto EXPAND_FAILED_CURLY;
5181 case 3: goto EXPAND_FAILED;
5184 /* Juggle the arguments if there are only two of them: always move the
5185 string to the last position and make ${length{n}{str}} equivalent to
5186 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5192 if (item_type == EITEM_LENGTH)
5199 for (i = 0; i < 2; i++)
5201 if (sub[i] == NULL) continue;
5202 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5203 if (*ret != 0 || (i != 0 && val[i] < 0))
5205 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5206 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5212 (item_type == EITEM_HASH)?
5213 compute_hash(sub[2], val[0], val[1], &len) :
5214 (item_type == EITEM_NHASH)?
5215 compute_nhash(sub[2], val[0], val[1], &len) :
5216 extract_substr(sub[2], val[0], val[1], &len);
5218 if (ret == NULL) goto EXPAND_FAILED;
5219 yield = string_catn(yield, ret, len);
5223 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5224 This code originally contributed by Steve Haslam. It currently supports
5225 the use of MD5 and SHA-1 hashes.
5227 We need some workspace that is large enough to handle all the supported
5228 hash types. Use macros to set the sizes rather than be too elaborate. */
5230 #define MAX_HASHLEN 20
5231 #define MAX_HASHBLOCKLEN 64
5240 int hashlen; /* Number of octets for the hash algorithm's output */
5241 int hashblocklen; /* Number of octets the hash algorithm processes */
5243 unsigned int keylen;
5245 uschar keyhash[MAX_HASHLEN];
5246 uschar innerhash[MAX_HASHLEN];
5247 uschar finalhash[MAX_HASHLEN];
5248 uschar finalhash_hex[2*MAX_HASHLEN];
5249 uschar innerkey[MAX_HASHBLOCKLEN];
5250 uschar outerkey[MAX_HASHBLOCKLEN];
5252 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5254 case 1: goto EXPAND_FAILED_CURLY;
5256 case 3: goto EXPAND_FAILED;
5261 if (Ustrcmp(sub[0], "md5") == 0)
5264 use_base = &md5_base;
5268 else if (Ustrcmp(sub[0], "sha1") == 0)
5271 use_base = &sha1_ctx;
5277 expand_string_message =
5278 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5283 keylen = Ustrlen(keyptr);
5285 /* If the key is longer than the hash block length, then hash the key
5288 if (keylen > hashblocklen)
5290 chash_start(type, use_base);
5291 chash_end(type, use_base, keyptr, keylen, keyhash);
5296 /* Now make the inner and outer key values */
5298 memset(innerkey, 0x36, hashblocklen);
5299 memset(outerkey, 0x5c, hashblocklen);
5301 for (i = 0; i < keylen; i++)
5303 innerkey[i] ^= keyptr[i];
5304 outerkey[i] ^= keyptr[i];
5307 /* Now do the hashes */
5309 chash_start(type, use_base);
5310 chash_mid(type, use_base, innerkey);
5311 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5313 chash_start(type, use_base);
5314 chash_mid(type, use_base, outerkey);
5315 chash_end(type, use_base, innerhash, hashlen, finalhash);
5317 /* Encode the final hash as a hex string */
5320 for (i = 0; i < hashlen; i++)
5322 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5323 *p++ = hex_digits[finalhash[i] & 0x0f];
5326 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5327 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5329 yield = string_catn(yield, finalhash_hex, hashlen*2);
5334 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5335 We have to save the numerical variables and restore them afterwards. */
5340 int moffset, moffsetextra, slen;
5343 const uschar *rerror;
5346 int save_expand_nmax =
5347 save_expand_strings(save_expand_nstring, save_expand_nlength);
5349 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"sg", &resetok))
5351 case 1: goto EXPAND_FAILED_CURLY;
5353 case 3: goto EXPAND_FAILED;
5356 /* Compile the regular expression */
5358 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
5363 expand_string_message = string_sprintf("regular expression error in "
5364 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
5368 /* Now run a loop to do the substitutions as often as necessary. It ends
5369 when there are no more matches. Take care over matches of the null string;
5370 do the same thing as Perl does. */
5373 slen = Ustrlen(sub[0]);
5374 moffset = moffsetextra = 0;
5379 int ovector[3*(EXPAND_MAXN+1)];
5380 int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra,
5381 PCRE_EOPT | emptyopt, ovector, nelem(ovector));
5385 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5386 is not necessarily the end. We want to repeat the match from one
5387 character further along, but leaving the basic offset the same (for
5388 copying below). We can't be at the end of the string - that was checked
5389 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5390 finished; copy the remaining string and end the loop. */
5400 yield = string_catn(yield, subject+moffset, slen-moffset);
5404 /* Match - set up for expanding the replacement. */
5406 if (n == 0) n = EXPAND_MAXN + 1;
5408 for (nn = 0; nn < n*2; nn += 2)
5410 expand_nstring[expand_nmax] = subject + ovector[nn];
5411 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
5415 /* Copy the characters before the match, plus the expanded insertion. */
5417 yield = string_catn(yield, subject + moffset, ovector[0] - moffset);
5418 insert = expand_string(sub[2]);
5419 if (insert == NULL) goto EXPAND_FAILED;
5420 yield = string_cat(yield, insert);
5422 moffset = ovector[1];
5426 /* If we have matched an empty string, first check to see if we are at
5427 the end of the subject. If so, the loop is over. Otherwise, mimic
5428 what Perl's /g options does. This turns out to be rather cunning. First
5429 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5430 string at the same point. If this fails (picked up above) we advance to
5431 the next character. */
5433 if (ovector[0] == ovector[1])
5435 if (ovector[0] == slen) break;
5436 emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED;
5440 /* All done - restore numerical variables. */
5442 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5443 save_expand_nlength);
5447 /* Handle keyed and numbered substring extraction. If the first argument
5448 consists entirely of digits, then a numerical extraction is assumed. */
5454 int field_number = 1;
5455 BOOL field_number_set = FALSE;
5456 uschar *save_lookup_value = lookup_value;
5458 int save_expand_nmax =
5459 save_expand_strings(save_expand_nstring, save_expand_nlength);
5461 /* While skipping we cannot rely on the data for expansions being
5462 available (eg. $item) hence cannot decide on numeric vs. keyed.
5463 Read a maximum of 5 arguments (including the yes/no) */
5467 while (isspace(*s)) s++;
5468 for (j = 5; j > 0 && *s == '{'; j--)
5470 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))
5471 goto EXPAND_FAILED; /*{*/
5474 expand_string_message = US"missing '{' for arg of extract";
5475 goto EXPAND_FAILED_CURLY;
5477 while (isspace(*s)) s++;
5479 if ( Ustrncmp(s, "fail", 4) == 0
5480 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
5484 while (isspace(*s)) s++;
5488 expand_string_message = US"missing '}' closing extract";
5489 goto EXPAND_FAILED_CURLY;
5493 else for (i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
5495 while (isspace(*s)) s++;
5496 if (*s == '{') /*}*/
5498 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5499 if (sub[i] == NULL) goto EXPAND_FAILED; /*{*/
5502 expand_string_message = string_sprintf(
5503 "missing '}' closing arg %d of extract", i+1);
5504 goto EXPAND_FAILED_CURLY;
5507 /* After removal of leading and trailing white space, the first
5508 argument must not be empty; if it consists entirely of digits
5509 (optionally preceded by a minus sign), this is a numerical
5510 extraction, and we expect 3 arguments. */
5518 while (isspace(*p)) p++;
5522 while (len > 0 && isspace(p[len-1])) len--;
5527 expand_string_message = US"first argument of \"extract\" must "
5537 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
5541 j = 3; /* Need 3 args */
5542 field_number_set = TRUE;
5548 expand_string_message = string_sprintf(
5549 "missing '{' for arg %d of extract", i+1);
5550 goto EXPAND_FAILED_CURLY;
5554 /* Extract either the numbered or the keyed substring into $value. If
5555 skipping, just pretend the extraction failed. */
5557 lookup_value = skipping? NULL : field_number_set?
5558 expand_gettokened(field_number, sub[1], sub[2]) :
5559 expand_getkeyed(sub[0], sub[1]);
5561 /* If no string follows, $value gets substituted; otherwise there can
5562 be yes/no strings, as for lookup or if. */
5564 switch(process_yesno(
5565 skipping, /* were previously skipping */
5566 lookup_value != NULL, /* success/failure indicator */
5567 save_lookup_value, /* value to reset for string2 */
5568 &s, /* input pointer */
5569 &yield, /* output pointer */
5570 US"extract", /* condition type */
5573 case 1: goto EXPAND_FAILED; /* when all is well, the */
5574 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5577 /* All done - restore numerical variables. */
5579 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5580 save_expand_nlength);
5585 /* return the Nth item from a list */
5587 case EITEM_LISTEXTRACT:
5590 int field_number = 1;
5591 uschar *save_lookup_value = lookup_value;
5593 int save_expand_nmax =
5594 save_expand_strings(save_expand_nstring, save_expand_nlength);
5596 /* Read the field & list arguments */
5598 for (i = 0; i < 2; i++)
5600 while (isspace(*s)) s++;
5601 if (*s != '{') /*}*/
5603 expand_string_message = string_sprintf(
5604 "missing '{' for arg %d of listextract", i+1);
5605 goto EXPAND_FAILED_CURLY;
5608 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5609 if (!sub[i]) goto EXPAND_FAILED; /*{*/
5612 expand_string_message = string_sprintf(
5613 "missing '}' closing arg %d of listextract", i+1);
5614 goto EXPAND_FAILED_CURLY;
5617 /* After removal of leading and trailing white space, the first
5618 argument must be numeric and nonempty. */
5626 while (isspace(*p)) p++;
5630 while (len > 0 && isspace(p[len-1])) len--;
5633 if (!*p && !skipping)
5635 expand_string_message = US"first argument of \"listextract\" must "
5645 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
5648 expand_string_message = US"first argument of \"listextract\" must "
5656 /* Extract the numbered element into $value. If
5657 skipping, just pretend the extraction failed. */
5659 lookup_value = skipping? NULL : expand_getlistele(field_number, sub[1]);
5661 /* If no string follows, $value gets substituted; otherwise there can
5662 be yes/no strings, as for lookup or if. */
5664 switch(process_yesno(
5665 skipping, /* were previously skipping */
5666 lookup_value != NULL, /* success/failure indicator */
5667 save_lookup_value, /* value to reset for string2 */
5668 &s, /* input pointer */
5669 &yield, /* output pointer */
5670 US"listextract", /* condition type */
5673 case 1: goto EXPAND_FAILED; /* when all is well, the */
5674 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5677 /* All done - restore numerical variables. */
5679 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5680 save_expand_nlength);
5686 case EITEM_CERTEXTRACT:
5688 uschar *save_lookup_value = lookup_value;
5690 int save_expand_nmax =
5691 save_expand_strings(save_expand_nstring, save_expand_nlength);
5693 /* Read the field argument */
5694 while (isspace(*s)) s++;
5695 if (*s != '{') /*}*/
5697 expand_string_message = US"missing '{' for field arg of certextract";
5698 goto EXPAND_FAILED_CURLY;
5700 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5701 if (!sub[0]) goto EXPAND_FAILED; /*{*/
5704 expand_string_message = US"missing '}' closing field arg of certextract";
5705 goto EXPAND_FAILED_CURLY;
5707 /* strip spaces fore & aft */
5712 while (isspace(*p)) p++;
5716 while (len > 0 && isspace(p[len-1])) len--;
5720 /* inspect the cert argument */
5721 while (isspace(*s)) s++;
5722 if (*s != '{') /*}*/
5724 expand_string_message = US"missing '{' for cert variable arg of certextract";
5725 goto EXPAND_FAILED_CURLY;
5729 expand_string_message = US"second argument of \"certextract\" must "
5730 "be a certificate variable";
5733 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
5734 if (!sub[1]) goto EXPAND_FAILED; /*{*/
5737 expand_string_message = US"missing '}' closing cert variable arg of certextract";
5738 goto EXPAND_FAILED_CURLY;
5742 lookup_value = NULL;
5745 lookup_value = expand_getcertele(sub[0], sub[1]);
5746 if (*expand_string_message) goto EXPAND_FAILED;
5748 switch(process_yesno(
5749 skipping, /* were previously skipping */
5750 lookup_value != NULL, /* success/failure indicator */
5751 save_lookup_value, /* value to reset for string2 */
5752 &s, /* input pointer */
5753 &yield, /* output pointer */
5754 US"certextract", /* condition type */
5757 case 1: goto EXPAND_FAILED; /* when all is well, the */
5758 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5761 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5762 save_expand_nlength);
5765 #endif /*SUPPORT_TLS*/
5767 /* Handle list operations */
5774 int save_ptr = yield->ptr;
5775 uschar outsep[2] = { '\0', '\0' };
5776 const uschar *list, *expr, *temp;
5777 uschar *save_iterate_item = iterate_item;
5778 uschar *save_lookup_value = lookup_value;
5780 while (isspace(*s)) s++;
5783 expand_string_message =
5784 string_sprintf("missing '{' for first arg of %s", name);
5785 goto EXPAND_FAILED_CURLY;
5788 list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
5789 if (list == NULL) goto EXPAND_FAILED;
5792 expand_string_message =
5793 string_sprintf("missing '}' closing first arg of %s", name);
5794 goto EXPAND_FAILED_CURLY;
5797 if (item_type == EITEM_REDUCE)
5800 while (isspace(*s)) s++;
5803 expand_string_message = US"missing '{' for second arg of reduce";
5804 goto EXPAND_FAILED_CURLY;
5806 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
5807 if (!t) goto EXPAND_FAILED;
5811 expand_string_message = US"missing '}' closing second arg of reduce";
5812 goto EXPAND_FAILED_CURLY;
5816 while (isspace(*s)) s++;
5819 expand_string_message =
5820 string_sprintf("missing '{' for last arg of %s", name);
5821 goto EXPAND_FAILED_CURLY;
5826 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
5827 if scanning a "false" part). This allows us to find the end of the
5828 condition, because if the list is empty, we won't actually evaluate the
5829 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
5830 the normal internal expansion function. */
5832 if (item_type == EITEM_FILTER)
5834 temp = eval_condition(expr, &resetok, NULL);
5835 if (temp != NULL) s = temp;
5838 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
5842 expand_string_message = string_sprintf("%s inside \"%s\" item",
5843 expand_string_message, name);
5847 while (isspace(*s)) s++;
5850 expand_string_message = string_sprintf("missing } at end of condition "
5851 "or expression inside \"%s\"; could be an unquoted } in the content",
5856 while (isspace(*s)) s++; /*{*/
5859 expand_string_message = string_sprintf("missing } at end of \"%s\"",
5864 /* If we are skipping, we can now just move on to the next item. When
5865 processing for real, we perform the iteration. */
5867 if (skipping) continue;
5868 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
5870 *outsep = (uschar)sep; /* Separator as a string */
5872 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
5873 name, iterate_item, lookup_value);
5875 if (item_type == EITEM_FILTER)
5878 if (eval_condition(expr, &resetok, &condresult) == NULL)
5880 iterate_item = save_iterate_item;
5881 lookup_value = save_lookup_value;
5882 expand_string_message = string_sprintf("%s inside \"%s\" condition",
5883 expand_string_message, name);
5886 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
5887 condresult? "true":"false");
5889 temp = iterate_item; /* TRUE => include this item */
5891 continue; /* FALSE => skip this item */
5894 /* EITEM_MAP and EITEM_REDUCE */
5898 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
5902 iterate_item = save_iterate_item;
5903 expand_string_message = string_sprintf("%s inside \"%s\" item",
5904 expand_string_message, name);
5907 if (item_type == EITEM_REDUCE)
5909 lookup_value = t; /* Update the value of $value */
5910 continue; /* and continue the iteration */
5914 /* We reach here for FILTER if the condition is true, always for MAP,
5915 and never for REDUCE. The value in "temp" is to be added to the output
5916 list that is being created, ensuring that any occurrences of the
5917 separator character are doubled. Unless we are dealing with the first
5918 item of the output list, add in a space if the new item begins with the
5919 separator character, or is an empty string. */
5921 if (yield->ptr != save_ptr && (temp[0] == *outsep || temp[0] == 0))
5922 yield = string_catn(yield, US" ", 1);
5924 /* Add the string in "temp" to the output list that we are building,
5925 This is done in chunks by searching for the separator character. */
5929 size_t seglen = Ustrcspn(temp, outsep);
5931 yield = string_catn(yield, temp, seglen + 1);
5933 /* If we got to the end of the string we output one character
5934 too many; backup and end the loop. Otherwise arrange to double the
5937 if (temp[seglen] == '\0') { yield->ptr--; break; }
5938 yield = string_catn(yield, outsep, 1);
5942 /* Output a separator after the string: we will remove the redundant
5943 final one at the end. */
5945 yield = string_catn(yield, outsep, 1);
5946 } /* End of iteration over the list loop */
5948 /* REDUCE has generated no output above: output the final value of
5951 if (item_type == EITEM_REDUCE)
5953 yield = string_cat(yield, lookup_value);
5954 lookup_value = save_lookup_value; /* Restore $value */
5957 /* FILTER and MAP generate lists: if they have generated anything, remove
5958 the redundant final separator. Even though an empty item at the end of a
5959 list does not count, this is tidier. */
5961 else if (yield->ptr != save_ptr) yield->ptr--;
5963 /* Restore preserved $item */
5965 iterate_item = save_iterate_item;
5972 const uschar *srclist, *cmp, *xtract;
5974 const uschar *dstlist = NULL, *dstkeylist = NULL;
5976 uschar *save_iterate_item = iterate_item;
5978 while (isspace(*s)) s++;
5981 expand_string_message = US"missing '{' for list arg of sort";
5982 goto EXPAND_FAILED_CURLY;
5985 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
5986 if (!srclist) goto EXPAND_FAILED;
5989 expand_string_message = US"missing '}' closing list arg of sort";
5990 goto EXPAND_FAILED_CURLY;
5993 while (isspace(*s)) s++;
5996 expand_string_message = US"missing '{' for comparator arg of sort";
5997 goto EXPAND_FAILED_CURLY;
6000 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok);
6001 if (!cmp) goto EXPAND_FAILED;
6004 expand_string_message = US"missing '}' closing comparator arg of sort";
6005 goto EXPAND_FAILED_CURLY;
6008 while (isspace(*s)) s++;
6011 expand_string_message = US"missing '{' for extractor arg of sort";
6012 goto EXPAND_FAILED_CURLY;
6016 tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
6017 if (!tmp) goto EXPAND_FAILED;
6018 xtract = string_copyn(xtract, s - xtract);
6022 expand_string_message = US"missing '}' closing extractor arg of sort";
6023 goto EXPAND_FAILED_CURLY;
6028 expand_string_message = US"missing } at end of \"sort\"";
6032 if (skipping) continue;
6034 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6037 gstring * newlist = NULL;
6038 gstring * newkeylist = NULL;
6041 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6043 /* extract field for comparisons */
6044 iterate_item = srcitem;
6045 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6049 expand_string_message = string_sprintf(
6050 "field-extract in sort: \"%s\"", xtract);
6054 /* Insertion sort */
6056 /* copy output list until new-item < list-item */
6057 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6063 /* field for comparison */
6064 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6067 /* build and run condition string */
6068 expr = string_sprintf("%s{%s}{%s}", cmp, srcfield, dstfield);
6070 DEBUG(D_expand) debug_printf_indent("%s: cond = \"%s\"\n", name, expr);
6071 if (!eval_condition(expr, &resetok, &before))
6073 expand_string_message = string_sprintf("comparison in sort: %s",
6080 /* New-item sorts before this dst-item. Append new-item,
6081 then dst-item, then remainder of dst list. */
6083 newlist = string_append_listele(newlist, sep, srcitem);
6084 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6087 newlist = string_append_listele(newlist, sep, dstitem);
6088 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6090 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6092 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6094 newlist = string_append_listele(newlist, sep, dstitem);
6095 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6101 newlist = string_append_listele(newlist, sep, dstitem);
6102 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6105 /* If we ran out of dstlist without consuming srcitem, append it */
6108 newlist = string_append_listele(newlist, sep, srcitem);
6109 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6112 dstlist = newlist->s;
6113 dstkeylist = newkeylist->s;
6115 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6116 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6120 yield = string_cat(yield, dstlist);
6122 /* Restore preserved $item */
6123 iterate_item = save_iterate_item;
6127 expand_string_message = US"Internal error in sort (list mismatch)";
6132 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6133 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6134 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6135 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6137 #define EXPAND_DLFUNC_MAX_ARGS 8
6140 #ifndef EXPAND_DLFUNC
6141 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6142 "is not included in this binary";
6145 #else /* EXPAND_DLFUNC */
6148 exim_dlfunc_t *func;
6151 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6153 if ((expand_forbid & RDO_DLFUNC) != 0)
6155 expand_string_message =
6156 US"dynamically-loaded functions are not permitted";
6160 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6161 TRUE, US"dlfunc", &resetok))
6163 case 1: goto EXPAND_FAILED_CURLY;
6165 case 3: goto EXPAND_FAILED;
6168 /* If skipping, we don't actually do anything */
6170 if (skipping) continue;
6172 /* Look up the dynamically loaded object handle in the tree. If it isn't
6173 found, dlopen() the file and put the handle in the tree for next time. */
6175 t = tree_search(dlobj_anchor, argv[0]);
6178 void *handle = dlopen(CS argv[0], RTLD_LAZY);
6181 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6182 argv[0], dlerror());
6183 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6186 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]));
6187 Ustrcpy(t->name, argv[0]);
6188 t->data.ptr = handle;
6189 (void)tree_insertnode(&dlobj_anchor, t);
6192 /* Having obtained the dynamically loaded object handle, look up the
6193 function pointer. */
6195 func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1]);
6198 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6199 "%s", argv[1], argv[0], dlerror());
6200 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6204 /* Call the function and work out what to do with the result. If it
6205 returns OK, we have a replacement string; if it returns DEFER then
6206 expansion has failed in a non-forced manner; if it returns FAIL then
6207 failure was forced; if it returns ERROR or any other value there's a
6208 problem, so panic slightly. In any case, assume that the function has
6209 side-effects on the store that must be preserved. */
6213 for (argc = 0; argv[argc] != NULL; argc++);
6214 status = func(&result, argc - 2, &argv[2]);
6217 if (result == NULL) result = US"";
6218 yield = string_cat(yield, result);
6223 expand_string_message = result == NULL ? US"(no message)" : result;
6224 if(status == FAIL_FORCED) expand_string_forcedfail = TRUE;
6225 else if(status != FAIL)
6226 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6227 argv[0], argv[1], status, expand_string_message);
6231 #endif /* EXPAND_DLFUNC */
6233 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6236 uschar *save_lookup_value = lookup_value;
6238 while (isspace(*s)) s++;
6239 if (*s != '{') /*}*/
6242 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6243 if (!key) goto EXPAND_FAILED; /*{*/
6246 expand_string_message = US"missing '{' for name arg of env";
6247 goto EXPAND_FAILED_CURLY;
6250 lookup_value = US getenv(CS key);
6252 switch(process_yesno(
6253 skipping, /* were previously skipping */
6254 lookup_value != NULL, /* success/failure indicator */
6255 save_lookup_value, /* value to reset for string2 */
6256 &s, /* input pointer */
6257 &yield, /* output pointer */
6258 US"env", /* condition type */
6261 case 1: goto EXPAND_FAILED; /* when all is well, the */
6262 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6266 } /* EITEM_* switch */
6268 /* Control reaches here if the name is not recognized as one of the more
6269 complicated expansion items. Check for the "operator" syntax (name terminated
6270 by a colon). Some of the operators have arguments, separated by _ from the
6278 var_entry *vp = NULL;
6280 /* Owing to an historical mis-design, an underscore may be part of the
6281 operator name, or it may introduce arguments. We therefore first scan the
6282 table of names that contain underscores. If there is no match, we cut off
6283 the arguments and then scan the main table. */
6285 if ((c = chop_match(name, op_table_underscore,
6286 nelem(op_table_underscore))) < 0)
6288 arg = Ustrchr(name, '_');
6289 if (arg != NULL) *arg = 0;
6290 c = chop_match(name, op_table_main, nelem(op_table_main));
6291 if (c >= 0) c += nelem(op_table_underscore);
6292 if (arg != NULL) *arg++ = '_'; /* Put back for error messages */
6295 /* Deal specially with operators that might take a certificate variable
6296 as we do not want to do the usual expansion. For most, expand the string.*/
6306 const uschar * s1 = s;
6307 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
6309 if (!sub) goto EXPAND_FAILED; /*{*/
6312 expand_string_message =
6313 string_sprintf("missing '}' closing cert arg of %s", name);
6314 goto EXPAND_FAILED_CURLY;
6316 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
6326 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6327 if (!sub) goto EXPAND_FAILED;
6332 /* If we are skipping, we don't need to perform the operation at all.
6333 This matters for operations like "mask", because the data may not be
6334 in the correct format when skipping. For example, the expression may test
6335 for the existence of $sender_host_address before trying to mask it. For
6336 other operations, doing them may not fail, but it is a waste of time. */
6338 if (skipping && c >= 0) continue;
6340 /* Otherwise, switch on the operator type */
6347 unsigned long int n = Ustrtoul(sub, &t, 10);
6352 expand_string_message = string_sprintf("argument for base32 "
6353 "operator is \"%s\", which is not a decimal number", sub);
6357 g = string_catn(g, &base32_chars[n & 0x1f], 1);
6359 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
6366 unsigned long int n = 0;
6370 uschar * t = Ustrchr(base32_chars, *tt++);
6373 expand_string_message = string_sprintf("argument for base32d "
6374 "operator is \"%s\", which is not a base 32 number", sub);
6377 n = n * 32 + (t - base32_chars);
6379 s = string_sprintf("%ld", n);
6380 yield = string_cat(yield, s);
6387 unsigned long int n = Ustrtoul(sub, &t, 10);
6390 expand_string_message = string_sprintf("argument for base62 "
6391 "operator is \"%s\", which is not a decimal number", sub);
6394 t = string_base62(n);
6395 yield = string_cat(yield, t);
6399 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
6405 unsigned long int n = 0;
6408 uschar *t = Ustrchr(base62_chars, *tt++);
6411 expand_string_message = string_sprintf("argument for base62d "
6412 "operator is \"%s\", which is not a base %d number", sub,
6416 n = n * BASE_62 + (t - base62_chars);
6418 (void)sprintf(CS buf, "%ld", n);
6419 yield = string_cat(yield, buf);
6425 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
6426 if (expanded == NULL)
6428 expand_string_message =
6429 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
6430 expand_string_message);
6433 yield = string_cat(yield, expanded);
6440 uschar *t = sub - 1;
6441 while (*(++t) != 0) { *t = tolower(*t); count++; }
6442 yield = string_catn(yield, sub, count);
6449 uschar *t = sub - 1;
6450 while (*(++t) != 0) { *t = toupper(*t); count++; }
6451 yield = string_catn(yield, sub, count);
6457 if (vp && *(void **)vp->value)
6459 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
6460 yield = string_cat(yield, cp);
6470 md5_end(&base, sub, Ustrlen(sub), digest);
6471 for(j = 0; j < 16; j++) sprintf(st+2*j, "%02x", digest[j]);
6472 yield = string_cat(yield, US st);
6478 if (vp && *(void **)vp->value)
6480 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
6481 yield = string_cat(yield, cp);
6491 sha1_end(&h, sub, Ustrlen(sub), digest);
6492 for(j = 0; j < 20; j++) sprintf(st+2*j, "%02X", digest[j]);
6493 yield = string_catn(yield, US st, 40);
6498 #ifdef EXIM_HAVE_SHA2
6499 if (vp && *(void **)vp->value)
6501 uschar * cp = tls_cert_fprt_sha256(*(void **)vp->value);
6502 yield = string_cat(yield, cp);
6510 if (!exim_sha_init(&h, HASH_SHA2_256))
6512 expand_string_message = US"unrecognised sha256 variant";
6515 exim_sha_update(&h, sub, Ustrlen(sub));
6516 exim_sha_finish(&h, &b);
6519 sprintf(st, "%02X", *b.data++);
6520 yield = string_catn(yield, US st, 2);
6524 expand_string_message = US"sha256 only supported with TLS";
6529 #ifdef EXIM_HAVE_SHA3
6534 hashmethod m = !arg ? HASH_SHA3_256
6535 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
6536 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
6537 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
6538 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
6541 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
6543 expand_string_message = US"unrecognised sha3 variant";
6547 exim_sha_update(&h, sub, Ustrlen(sub));
6548 exim_sha_finish(&h, &b);
6551 sprintf(st, "%02X", *b.data++);
6552 yield = string_catn(yield, US st, 2);
6557 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
6561 /* Convert hex encoding to base64 encoding */
6571 for (enc = sub; *enc != 0; enc++)
6573 if (!isxdigit(*enc))
6575 expand_string_message = string_sprintf("\"%s\" is not a hex "
6584 expand_string_message = string_sprintf("\"%s\" contains an odd "
6585 "number of characters", sub);
6589 while ((c = *in++) != 0)
6591 if (isdigit(c)) c -= '0';
6592 else c = toupper(c) - 'A' + 10;
6604 enc = b64encode(sub, out - sub);
6605 yield = string_cat(yield, enc);
6609 /* Convert octets outside 0x21..0x7E to \xXX form */
6613 uschar *t = sub - 1;
6616 if (*t < 0x21 || 0x7E < *t)
6617 yield = string_catn(yield, string_sprintf("\\x%02x", *t), 4);
6619 yield = string_catn(yield, t, 1);
6624 /* count the number of list elements */
6633 while (string_nextinlist(CUSS &sub, &sep, buffer, sizeof(buffer)) != NULL) cnt++;
6634 cp = string_sprintf("%d", cnt);
6635 yield = string_cat(yield, cp);
6639 /* expand a named list given the name */
6640 /* handles nested named lists; requotes as colon-sep list */
6644 tree_node *t = NULL;
6645 const uschar * list;
6648 uschar * suffix = US"";
6649 BOOL needsep = FALSE;
6652 if (*sub == '+') sub++;
6653 if (arg == NULL) /* no-argument version */
6655 if (!(t = tree_search(addresslist_anchor, sub)) &&
6656 !(t = tree_search(domainlist_anchor, sub)) &&
6657 !(t = tree_search(hostlist_anchor, sub)))
6658 t = tree_search(localpartlist_anchor, sub);
6660 else switch(*arg) /* specific list-type version */
6662 case 'a': t = tree_search(addresslist_anchor, sub); suffix = US"_a"; break;
6663 case 'd': t = tree_search(domainlist_anchor, sub); suffix = US"_d"; break;
6664 case 'h': t = tree_search(hostlist_anchor, sub); suffix = US"_h"; break;
6665 case 'l': t = tree_search(localpartlist_anchor, sub); suffix = US"_l"; break;
6667 expand_string_message = string_sprintf("bad suffix on \"list\" operator");
6673 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
6675 : *arg=='a'?"address "
6676 : *arg=='d'?"domain "
6678 : *arg=='l'?"localpart "
6683 list = ((namedlist_block *)(t->data.ptr))->string;
6685 while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
6687 uschar * buf = US" : ";
6689 yield = string_catn(yield, buf, 3);
6693 if (*item == '+') /* list item is itself a named list */
6695 uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item);
6696 item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE, &resetok);
6698 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
6702 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
6703 while ((cp= strpbrk(CCS item, tok)))
6705 yield = string_catn(yield, item, cp - CS item);
6706 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
6708 yield = string_catn(yield, US"::", 2);
6711 else /* sep in item; should already be doubled; emit once */
6713 yield = string_catn(yield, US tok, 1);
6714 if (*cp == sep) cp++;
6719 yield = string_cat(yield, item);
6724 /* mask applies a mask to an IP address; for example the result of
6725 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
6732 int mask, maskoffset;
6733 int type = string_is_ip_address(sub, &maskoffset);
6738 expand_string_message = string_sprintf("\"%s\" is not an IP address",
6743 if (maskoffset == 0)
6745 expand_string_message = string_sprintf("missing mask value in \"%s\"",
6750 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
6752 if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128))
6754 expand_string_message = string_sprintf("mask value too big in \"%s\"",
6759 /* Convert the address to binary integer(s) and apply the mask */
6761 sub[maskoffset] = 0;
6762 count = host_aton(sub, binary);
6763 host_mask(count, binary, mask);
6765 /* Convert to masked textual format and add to output. */
6767 yield = string_catn(yield, buffer,
6768 host_nmtoa(count, binary, mask, buffer, '.'));
6773 case EOP_IPV6DENORM:
6775 int type = string_is_ip_address(sub, NULL);
6782 (void) host_aton(sub, binary);
6785 case 4: /* convert to IPv4-mapped IPv6 */
6786 binary[0] = binary[1] = 0;
6787 binary[2] = 0x0000ffff;
6788 (void) host_aton(sub, binary+3);
6792 expand_string_message =
6793 string_sprintf("\"%s\" is not an IP address", sub);
6797 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
6798 ? ipv6_nmtoa(binary, buffer)
6799 : host_nmtoa(4, binary, -1, buffer, ':')
6805 case EOP_LOCAL_PART:
6809 int start, end, domain;
6810 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
6813 if (c != EOP_DOMAIN)
6815 if (c == EOP_LOCAL_PART && domain != 0) end = start + domain - 1;
6816 yield = string_catn(yield, sub+start, end-start);
6818 else if (domain != 0)
6821 yield = string_catn(yield, sub+domain, end-domain);
6828 uschar outsep[2] = { ':', '\0' };
6829 uschar *address, *error;
6830 int save_ptr = yield->ptr;
6831 int start, end, domain; /* Not really used */
6833 while (isspace(*sub)) sub++;
6835 if (*outsep = *++sub) ++sub;
6838 expand_string_message = string_sprintf("output separator "
6839 "missing in expanding ${addresses:%s}", --sub);
6842 parse_allow_group = TRUE;
6846 uschar *p = parse_find_address_end(sub, FALSE);
6847 uschar saveend = *p;
6849 address = parse_extract_address(sub, &error, &start, &end, &domain,
6853 /* Add the address to the output list that we are building. This is
6854 done in chunks by searching for the separator character. At the
6855 start, unless we are dealing with the first address of the output
6856 list, add in a space if the new address begins with the separator
6857 character, or is an empty string. */
6859 if (address != NULL)
6861 if (yield->ptr != save_ptr && address[0] == *outsep)
6862 yield = string_catn(yield, US" ", 1);
6866 size_t seglen = Ustrcspn(address, outsep);
6867 yield = string_catn(yield, address, seglen + 1);
6869 /* If we got to the end of the string we output one character
6872 if (address[seglen] == '\0') { yield->ptr--; break; }
6873 yield = string_catn(yield, outsep, 1);
6874 address += seglen + 1;
6877 /* Output a separator after the string: we will remove the
6878 redundant final one at the end. */
6880 yield = string_catn(yield, outsep, 1);
6883 if (saveend == '\0') break;
6887 /* If we have generated anything, remove the redundant final
6890 if (yield->ptr != save_ptr) yield->ptr--;
6891 parse_allow_group = FALSE;
6896 /* quote puts a string in quotes if it is empty or contains anything
6897 other than alphamerics, underscore, dot, or hyphen.
6899 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
6900 be quoted in order to be a valid local part.
6902 In both cases, newlines and carriage returns are converted into \n and \r
6906 case EOP_QUOTE_LOCAL_PART:
6909 BOOL needs_quote = (*sub == 0); /* TRUE for empty string */
6910 uschar *t = sub - 1;
6914 while (!needs_quote && *(++t) != 0)
6915 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
6917 else /* EOP_QUOTE_LOCAL_PART */
6919 while (!needs_quote && *(++t) != 0)
6920 needs_quote = !isalnum(*t) &&
6921 strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
6922 (*t != '.' || t == sub || t[1] == 0);
6927 yield = string_catn(yield, US"\"", 1);
6932 yield = string_catn(yield, US"\\n", 2);
6933 else if (*t == '\r')
6934 yield = string_catn(yield, US"\\r", 2);
6937 if (*t == '\\' || *t == '"')
6938 yield = string_catn(yield, US"\\", 1);
6939 yield = string_catn(yield, t, 1);
6942 yield = string_catn(yield, US"\"", 1);
6944 else yield = string_cat(yield, sub);
6948 /* quote_lookuptype does lookup-specific quoting */
6953 uschar *opt = Ustrchr(arg, '_');
6955 if (opt != NULL) *opt++ = 0;
6957 n = search_findtype(arg, Ustrlen(arg));
6960 expand_string_message = search_error_message;
6964 if (lookup_list[n]->quote != NULL)
6965 sub = (lookup_list[n]->quote)(sub, opt);
6966 else if (opt != NULL) sub = NULL;
6970 expand_string_message = string_sprintf(
6971 "\"%s\" unrecognized after \"${quote_%s\"",
6976 yield = string_cat(yield, sub);
6980 /* rx quote sticks in \ before any non-alphameric character so that
6981 the insertion works in a regular expression. */
6985 uschar *t = sub - 1;
6989 yield = string_catn(yield, US"\\", 1);
6990 yield = string_catn(yield, t, 1);
6995 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
6996 prescribed by the RFC, if there are characters that need to be encoded */
7000 uschar buffer[2048];
7001 const uschar *string = parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7002 buffer, sizeof(buffer), FALSE);
7003 yield = string_cat(yield, string);
7007 /* RFC 2047 decode */
7013 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7014 headers_charset, '?', &len, &error);
7017 expand_string_message = error;
7020 yield = string_catn(yield, decoded, len);
7024 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7034 if (c > 255) c = '_';
7036 yield = string_catn(yield, buff, 1);
7041 /* replace illegal UTF-8 sequences by replacement character */
7043 #define UTF8_REPLACEMENT_CHAR US"?"
7047 int seq_len = 0, index = 0;
7049 long codepoint = -1;
7050 uschar seq_buff[4]; /* accumulate utf-8 here */
7059 if ((c & 0xc0) != 0x80)
7060 /* wrong continuation byte; invalidate all bytes */
7061 complete = 1; /* error */
7064 codepoint = (codepoint << 6) | (c & 0x3f);
7065 seq_buff[index++] = c;
7066 if (--bytes_left == 0) /* codepoint complete */
7067 if(codepoint > 0x10FFFF) /* is it too large? */
7068 complete = -1; /* error (RFC3629 limit) */
7070 { /* finished; output utf-8 sequence */
7071 yield = string_catn(yield, seq_buff, seq_len);
7076 else /* no bytes left: new sequence */
7078 if((c & 0x80) == 0) /* 1-byte sequence, US-ASCII, keep it */
7080 yield = string_catn(yield, &c, 1);
7083 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7085 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7090 codepoint = c & 0x1f;
7093 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7096 codepoint = c & 0x0f;
7098 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7101 codepoint = c & 0x07;
7103 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7106 seq_buff[index++] = c;
7107 seq_len = bytes_left + 1;
7108 } /* if(bytes_left) */
7112 bytes_left = index = 0;
7113 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7115 if ((complete == 1) && ((c & 0x80) == 0))
7116 /* ASCII character follows incomplete sequence */
7117 yield = string_catn(yield, &c, 1);
7123 case EOP_UTF8_DOMAIN_TO_ALABEL:
7125 uschar * error = NULL;
7126 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7129 expand_string_message = string_sprintf(
7130 "error converting utf8 (%s) to alabel: %s",
7131 string_printing(sub), error);
7134 yield = string_cat(yield, s);
7138 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7140 uschar * error = NULL;
7141 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7144 expand_string_message = string_sprintf(
7145 "error converting alabel (%s) to utf8: %s",
7146 string_printing(sub), error);
7149 yield = string_cat(yield, s);
7153 case EOP_UTF8_LOCALPART_TO_ALABEL:
7155 uschar * error = NULL;
7156 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7159 expand_string_message = string_sprintf(
7160 "error converting utf8 (%s) to alabel: %s",
7161 string_printing(sub), error);
7164 yield = string_cat(yield, s);
7165 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7169 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7171 uschar * error = NULL;
7172 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7175 expand_string_message = string_sprintf(
7176 "error converting alabel (%s) to utf8: %s",
7177 string_printing(sub), error);
7180 yield = string_cat(yield, s);
7183 #endif /* EXPERIMENTAL_INTERNATIONAL */
7185 /* escape turns all non-printing characters into escape sequences. */
7189 const uschar * t = string_printing(sub);
7190 yield = string_cat(yield, t);
7194 case EOP_ESCAPE8BIT:
7196 const uschar * s = sub;
7199 for (s = sub; (c = *s); s++)
7200 yield = c < 127 && c != '\\'
7201 ? string_catn(yield, s, 1)
7202 : string_catn(yield, string_sprintf("\\%03o", c), 4);
7206 /* Handle numeric expression evaluation */
7211 uschar *save_sub = sub;
7212 uschar *error = NULL;
7213 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7216 expand_string_message = string_sprintf("error in expression "
7217 "evaluation: %s (after processing \"%.*s\")", error,
7218 (int)(sub-save_sub), save_sub);
7221 sprintf(CS var_buffer, PR_EXIM_ARITH, n);
7222 yield = string_cat(yield, var_buffer);
7226 /* Handle time period formating */
7230 int n = readconf_readtime(sub, 0, FALSE);
7233 expand_string_message = string_sprintf("string \"%s\" is not an "
7234 "Exim time interval in \"%s\" operator", sub, name);
7237 sprintf(CS var_buffer, "%d", n);
7238 yield = string_cat(yield, var_buffer);
7242 case EOP_TIME_INTERVAL:
7245 uschar *t = read_number(&n, sub);
7246 if (*t != 0) /* Not A Number*/
7248 expand_string_message = string_sprintf("string \"%s\" is not a "
7249 "positive number in \"%s\" operator", sub, name);
7252 t = readconf_printtime(n);
7253 yield = string_cat(yield, t);
7257 /* Convert string to base64 encoding */
7263 uschar * s = vp && *(void **)vp->value
7264 ? tls_cert_der_b64(*(void **)vp->value)
7265 : b64encode(sub, Ustrlen(sub));
7267 uschar * s = b64encode(sub, Ustrlen(sub));
7269 yield = string_cat(yield, s);
7276 int len = b64decode(sub, &s);
7279 expand_string_message = string_sprintf("string \"%s\" is not "
7280 "well-formed for \"%s\" operator", sub, name);
7283 yield = string_cat(yield, s);
7287 /* strlen returns the length of the string */
7292 (void)sprintf(CS buff, "%d", Ustrlen(sub));
7293 yield = string_cat(yield, buff);
7297 /* length_n or l_n takes just the first n characters or the whole string,
7298 whichever is the shorter;
7300 substr_m_n, and s_m_n take n characters from offset m; negative m take
7301 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
7302 takes the rest, either to the right or to the left.
7304 hash_n or h_n makes a hash of length n from the string, yielding n
7305 characters from the set a-z; hash_n_m makes a hash of length n, but
7306 uses m characters from the set a-zA-Z0-9.
7308 nhash_n returns a single number between 0 and n-1 (in text form), while
7309 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
7310 between 0 and n-1 and the second between 0 and m-1. */
7330 expand_string_message = string_sprintf("missing values after %s",
7335 /* "length" has only one argument, effectively being synonymous with
7338 if (c == EOP_LENGTH || c == EOP_L)
7344 /* The others have one or two arguments; for "substr" the first may be
7345 negative. The second being negative means "not supplied". */
7350 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
7353 /* Read up to two numbers, separated by underscores */
7358 if (arg != ret && *arg == '_' && pn == &value1)
7362 if (arg[1] != 0) arg++;
7364 else if (!isdigit(*arg))
7366 expand_string_message =
7367 string_sprintf("non-digit after underscore in \"%s\"", name);
7370 else *pn = (*pn)*10 + *arg++ - '0';
7374 /* Perform the required operation */
7377 (c == EOP_HASH || c == EOP_H)?
7378 compute_hash(sub, value1, value2, &len) :
7379 (c == EOP_NHASH || c == EOP_NH)?
7380 compute_nhash(sub, value1, value2, &len) :
7381 extract_substr(sub, value1, value2, &len);
7383 if (ret == NULL) goto EXPAND_FAILED;
7384 yield = string_catn(yield, ret, len);
7394 uschar **modetable[3];
7399 if ((expand_forbid & RDO_EXISTS) != 0)
7401 expand_string_message = US"Use of the stat() expansion is not permitted";
7405 if (stat(CS sub, &st) < 0)
7407 expand_string_message = string_sprintf("stat(%s) failed: %s",
7408 sub, strerror(errno));
7412 switch (mode & S_IFMT)
7414 case S_IFIFO: smode[0] = 'p'; break;
7415 case S_IFCHR: smode[0] = 'c'; break;
7416 case S_IFDIR: smode[0] = 'd'; break;
7417 case S_IFBLK: smode[0] = 'b'; break;
7418 case S_IFREG: smode[0] = '-'; break;
7419 default: smode[0] = '?'; break;
7422 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
7423 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
7424 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
7426 for (i = 0; i < 3; i++)
7428 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
7433 s = string_sprintf("mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
7434 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
7435 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
7436 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
7437 (long)st.st_gid, st.st_size, (long)st.st_atime,
7438 (long)st.st_mtime, (long)st.st_ctime);
7439 yield = string_cat(yield, s);
7443 /* vaguely random number less than N */
7447 int_eximarith_t max;
7450 max = expanded_string_integer(sub, TRUE);
7451 if (expand_string_message != NULL)
7453 s = string_sprintf("%d", vaguely_random_number((int)max));
7454 yield = string_cat(yield, s);
7458 /* Reverse IP, including IPv6 to dotted-nibble */
7460 case EOP_REVERSE_IP:
7462 int family, maskptr;
7463 uschar reversed[128];
7465 family = string_is_ip_address(sub, &maskptr);
7468 expand_string_message = string_sprintf(
7469 "reverse_ip() not given an IP address [%s]", sub);
7472 invert_address(reversed, sub);
7473 yield = string_cat(yield, reversed);
7477 /* Unknown operator */
7480 expand_string_message =
7481 string_sprintf("unknown expansion operator \"%s\"", name);
7486 /* Handle a plain name. If this is the first thing in the expansion, release
7487 the pre-allocated buffer. If the result data is known to be in a new buffer,
7488 newsize will be set to the size of that buffer, and we can just point at that
7489 store instead of copying. Many expansion strings contain just one reference,
7490 so this is a useful optimization, especially for humungous headers
7491 ($message_headers). */
7500 g = store_get(sizeof(gstring));
7501 else if (yield->ptr == 0)
7503 if (resetok) store_reset(yield);
7505 g = store_get(sizeof(gstring)); /* alloc _before_ calling find_variable() */
7507 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
7509 expand_string_message =
7510 string_sprintf("unknown variable in \"${%s}\"", name);
7511 check_variable_error_message(name);
7514 len = Ustrlen(value);
7515 if (!yield && newsize)
7518 yield->size = newsize;
7523 yield = string_catn(yield, value, len);
7527 /* Else there's something wrong */
7529 expand_string_message =
7530 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
7531 "in a variable reference)", name);
7535 /* If we hit the end of the string when ket_ends is set, there is a missing
7536 terminating brace. */
7538 if (ket_ends && *s == 0)
7540 expand_string_message = malformed_header
7541 ? US"missing } at end of string - could be header name not terminated by colon"
7542 : US"missing } at end of string";
7546 /* Expansion succeeded; yield may still be NULL here if nothing was actually
7547 added to the string. If so, set up an empty string. Add a terminating zero. If
7548 left != NULL, return a pointer to the terminator. */
7551 yield = string_get(1);
7552 (void) string_from_gstring(yield);
7553 if (left) *left = s;
7555 /* Any stacking store that was used above the final string is no longer needed.
7556 In many cases the final string will be the first one that was got and so there
7557 will be optimal store usage. */
7559 if (resetok) store_reset(yield->s + (yield->size = yield->ptr + 1));
7560 else if (resetok_p) *resetok_p = FALSE;
7564 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
7565 "expanding: %.*s\n",
7566 (int)(s - string), string);
7567 debug_printf_indent("%s"
7568 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
7570 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
7573 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
7574 "skipping: result is not used\n");
7579 /* This is the failure exit: easiest to program with a goto. We still need
7580 to update the pointer to the terminator, for cases of nested calls with "fail".
7583 EXPAND_FAILED_CURLY:
7584 if (malformed_header)
7585 expand_string_message =
7586 US"missing or misplaced { or } - could be header name not terminated by colon";
7588 else if (!expand_string_message || !*expand_string_message)
7589 expand_string_message = US"missing or misplaced { or }";
7591 /* At one point, Exim reset the store to yield (if yield was not NULL), but
7592 that is a bad idea, because expand_string_message is in dynamic store. */
7595 if (left) *left = s;
7598 debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n",
7600 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
7601 "error message: %s\n",
7602 expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
7603 expand_string_message);
7604 if (expand_string_forcedfail)
7605 debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n");
7607 if (resetok_p && !resetok) *resetok_p = FALSE;
7613 /* This is the external function call. Do a quick check for any expansion
7614 metacharacters, and if there are none, just return the input string.
7616 Argument: the string to be expanded
7617 Returns: the expanded string, or NULL if expansion failed; if failure was
7618 due to a lookup deferring, search_find_defer will be TRUE
7622 expand_cstring(const uschar * string)
7624 if (Ustrpbrk(string, "$\\") != NULL)
7626 int old_pool = store_pool;
7629 search_find_defer = FALSE;
7630 malformed_header = FALSE;
7631 store_pool = POOL_MAIN;
7632 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
7633 store_pool = old_pool;
7641 expand_string(uschar * string)
7643 return US expand_cstring(CUS string);
7650 /*************************************************
7652 *************************************************/
7654 /* Now and again we want to expand a string and be sure that the result is in a
7655 new bit of store. This function does that.
7656 Since we know it has been copied, the de-const cast is safe.
7658 Argument: the string to be expanded
7659 Returns: the expanded string, always in a new bit of store, or NULL
7663 expand_string_copy(const uschar *string)
7665 const uschar *yield = expand_cstring(string);
7666 if (yield == string) yield = string_copy(string);
7672 /*************************************************
7673 * Expand and interpret as an integer *
7674 *************************************************/
7676 /* Expand a string, and convert the result into an integer.
7679 string the string to be expanded
7680 isplus TRUE if a non-negative number is expected
7682 Returns: the integer value, or
7683 -1 for an expansion error ) in both cases, message in
7684 -2 for an integer interpretation error ) expand_string_message
7685 expand_string_message is set NULL for an OK integer
7689 expand_string_integer(uschar *string, BOOL isplus)
7691 return expanded_string_integer(expand_string(string), isplus);
7695 /*************************************************
7696 * Interpret string as an integer *
7697 *************************************************/
7699 /* Convert a string (that has already been expanded) into an integer.
7701 This function is used inside the expansion code.
7704 s the string to be expanded
7705 isplus TRUE if a non-negative number is expected
7707 Returns: the integer value, or
7708 -1 if string is NULL (which implies an expansion error)
7709 -2 for an integer interpretation error
7710 expand_string_message is set NULL for an OK integer
7713 static int_eximarith_t
7714 expanded_string_integer(const uschar *s, BOOL isplus)
7716 int_eximarith_t value;
7717 uschar *msg = US"invalid integer \"%s\"";
7720 /* If expansion failed, expand_string_message will be set. */
7722 if (s == NULL) return -1;
7724 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
7725 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
7726 systems, so we set it zero ourselves. */
7729 expand_string_message = NULL; /* Indicates no error */
7731 /* Before Exim 4.64, strings consisting entirely of whitespace compared
7732 equal to 0. Unfortunately, people actually relied upon that, so preserve
7733 the behaviour explicitly. Stripping leading whitespace is a harmless
7734 noop change since strtol skips it anyway (provided that there is a number
7738 while (isspace(*s)) ++s;
7742 debug_printf_indent("treating blank string as number 0\n");
7747 value = strtoll(CS s, CSS &endptr, 10);
7751 msg = US"integer expected but \"%s\" found";
7753 else if (value < 0 && isplus)
7755 msg = US"non-negative integer expected but \"%s\" found";
7759 switch (tolower(*endptr))
7764 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
7769 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
7770 else value *= 1024*1024;
7774 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
7775 else value *= 1024*1024*1024;
7779 if (errno == ERANGE)
7780 msg = US"absolute value of integer \"%s\" is too large (overflow)";
7783 while (isspace(*endptr)) endptr++;
7784 if (*endptr == 0) return value;
7788 expand_string_message = string_sprintf(CS msg, s);
7793 /* These values are usually fixed boolean values, but they are permitted to be
7797 addr address being routed
7798 mtype the module type
7799 mname the module name
7800 dbg_opt debug selectors
7801 oname the option name
7802 bvalue the router's boolean value
7803 svalue the router's string value
7804 rvalue where to put the returned value
7806 Returns: OK value placed in rvalue
7807 DEFER expansion failed
7811 exp_bool(address_item *addr,
7812 uschar *mtype, uschar *mname, unsigned dbg_opt,
7813 uschar *oname, BOOL bvalue,
7814 uschar *svalue, BOOL *rvalue)
7817 if (svalue == NULL) { *rvalue = bvalue; return OK; }
7819 expanded = expand_string(svalue);
7820 if (expanded == NULL)
7822 if (expand_string_forcedfail)
7824 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
7828 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
7829 oname, mname, mtype, expand_string_message);
7830 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
7834 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
7837 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
7839 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
7843 addr->message = string_sprintf("\"%s\" is not a valid value for the "
7844 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
7853 /* Avoid potentially exposing a password in a string about to be logged */
7856 expand_hide_passwords(uschar * s)
7858 return ( ( Ustrstr(s, "failed to expand") != NULL
7859 || Ustrstr(s, "expansion of ") != NULL
7861 && ( Ustrstr(s, "mysql") != NULL
7862 || Ustrstr(s, "pgsql") != NULL
7863 || Ustrstr(s, "redis") != NULL
7864 || Ustrstr(s, "sqlite") != NULL
7865 || Ustrstr(s, "ldap:") != NULL
7866 || Ustrstr(s, "ldaps:") != NULL
7867 || Ustrstr(s, "ldapi:") != NULL
7868 || Ustrstr(s, "ldapdn:") != NULL
7869 || Ustrstr(s, "ldapm:") != NULL
7871 ? US"Temporary internal error" : s;
7875 /* Read given named file into big_buffer. Use for keying material etc.
7876 The content will have an ascii NUL appended.
7881 Return: pointer to buffer, or NULL on error.
7885 expand_file_big_buffer(const uschar * filename)
7887 int fd, off = 0, len;
7889 if ((fd = open(CS filename, O_RDONLY)) < 0)
7891 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
7898 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
7901 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
7909 big_buffer[off] = '\0';
7915 /*************************************************
7916 * Error-checking for testsuite *
7917 *************************************************/
7919 uschar * region_start;
7920 uschar * region_end;
7921 const uschar *var_name;
7922 const uschar *var_data;
7926 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
7929 if (var_data >= e->region_start && var_data < e->region_end)
7931 e->var_name = CUS var_name;
7932 e->var_data = CUS var_data;
7937 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
7939 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
7940 .var_name = NULL, .var_data = NULL };
7944 /* check acl_ variables */
7945 tree_walk(acl_var_c, assert_variable_notin, &e);
7946 tree_walk(acl_var_m, assert_variable_notin, &e);
7948 /* check auth<n> variables */
7949 for (i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
7950 assert_variable_notin(US"auth<n>", auth_vars[i], &e);
7952 /* check regex<n> variables */
7953 for (i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
7954 assert_variable_notin(US"regex<n>", regex_vars[i], &e);
7956 /* check known-name variables */
7957 for (v = var_table; v < var_table + var_table_size; v++)
7958 if (v->type == vtype_stringptr)
7959 assert_variable_notin(US v->name, *(USS v->value), &e);
7961 /* check dns and address trees */
7962 tree_walk(tree_dns_fails, assert_variable_notin, &e);
7963 tree_walk(tree_duplicates, assert_variable_notin, &e);
7964 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
7965 tree_walk(tree_unusable, assert_variable_notin, &e);
7968 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
7969 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
7970 e.var_name, filename, linenumber, e.var_data);
7975 /*************************************************
7976 **************************************************
7977 * Stand-alone test program *
7978 **************************************************
7979 *************************************************/
7985 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
7987 int ovector[3*(EXPAND_MAXN+1)];
7988 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
7989 ovector, nelem(ovector));
7990 BOOL yield = n >= 0;
7991 if (n == 0) n = EXPAND_MAXN + 1;
7995 expand_nmax = (setup < 0)? 0 : setup + 1;
7996 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
7998 expand_nstring[expand_nmax] = subject + ovector[nn];
7999 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
8007 int main(int argc, uschar **argv)
8010 uschar buffer[1024];
8012 debug_selector = D_v;
8013 debug_file = stderr;
8014 debug_fd = fileno(debug_file);
8015 big_buffer = malloc(big_buffer_size);
8017 for (i = 1; i < argc; i++)
8019 if (argv[i][0] == '+')
8021 debug_trace_memory = 2;
8024 if (isdigit(argv[i][0]))
8025 debug_selector = Ustrtol(argv[i], NULL, 0);
8027 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8031 eldap_default_servers = argv[i];
8034 mysql_servers = argv[i];
8037 pgsql_servers = argv[i];
8040 redis_servers = argv[i];
8044 else opt_perl_startup = argv[i];
8048 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8050 expand_nstring[1] = US"string 1....";
8051 expand_nlength[1] = 8;
8055 if (opt_perl_startup != NULL)
8058 printf("Starting Perl interpreter\n");
8059 errstr = init_perl(opt_perl_startup);
8062 printf("** error in perl_startup code: %s\n", errstr);
8063 return EXIT_FAILURE;
8066 #endif /* EXIM_PERL */
8068 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8070 void *reset_point = store_get(0);
8071 uschar *yield = expand_string(buffer);
8074 printf("%s\n", yield);
8075 store_reset(reset_point);
8079 if (search_find_defer) printf("search_find deferred\n");
8080 printf("Failed: %s\n", expand_string_message);
8081 if (expand_string_forcedfail) printf("Forced failure\n");
8095 /* End of expand.c */