1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
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(uschar *, BOOL, uschar **, BOOL, BOOL, BOOL *);
19 #ifndef SUPPORT_CRYPTEQ
20 #define SUPPORT_CRYPTEQ
25 #include "lookups/ldap.h"
28 #ifdef SUPPORT_CRYPTEQ
33 extern char* crypt16(char*, char*);
37 /* The handling of crypt16() is a mess. I will record below the analysis of the
38 mess that was sent to me. We decided, however, to make changing this very low
39 priority, because in practice people are moving away from the crypt()
40 algorithms nowadays, so it doesn't seem worth it.
43 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
44 the first 8 characters of the password using a 20-round version of crypt
45 (standard crypt does 25 rounds). It then crypts the next 8 characters,
46 or an empty block if the password is less than 9 characters, using a
47 20-round version of crypt and the same salt as was used for the first
48 block. Charaters after the first 16 are ignored. It always generates
49 a 16-byte hash, which is expressed together with the salt as a string
50 of 24 base 64 digits. Here are some links to peruse:
52 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
53 http://seclists.org/bugtraq/1999/Mar/0076.html
55 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
56 and OSF/1. This is the same as the standard crypt if given a password
57 of 8 characters or less. If given more, it first does the same as crypt
58 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
59 using as salt the first two base 64 digits from the first hash block.
60 If the password is more than 16 characters then it crypts the 17th to 24th
61 characters using as salt the first two base 64 digits from the second hash
62 block. And so on: I've seen references to it cutting off the password at
63 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
65 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
66 http://seclists.org/bugtraq/1999/Mar/0109.html
67 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
68 TET1_html/sec.c222.html#no_id_208
70 Exim has something it calls "crypt16". It will either use a native
71 crypt16 or its own implementation. A native crypt16 will presumably
72 be the one that I called "crypt16" above. The internal "crypt16"
73 function, however, is a two-block-maximum implementation of what I called
74 "bigcrypt". The documentation matches the internal code.
76 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
77 that crypt16 and bigcrypt were different things.
79 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
80 to whatever it is using under that name. This unfortunately sets a
81 precedent for using "{crypt16}" to identify two incompatible algorithms
82 whose output can't be distinguished. With "{crypt16}" thus rendered
83 ambiguous, I suggest you deprecate it and invent two new identifiers
84 for the two algorithms.
86 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
87 of the password separately means they can be cracked separately, so
88 the double-length hash only doubles the cracking effort instead of
89 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
97 # define nelements(arr) (sizeof(arr) / sizeof(*arr))
100 /*************************************************
101 * Local statics and tables *
102 *************************************************/
104 /* Table of item names, and corresponding switch numbers. The names must be in
105 alphabetical order. */
107 static uschar *item_table[] = {
157 /* Tables of operator names, and corresponding switch numbers. The names must be
158 in alphabetical order. There are two tables, because underscore is used in some
159 cases to introduce arguments, whereas for other it is part of the name. This is
160 an historical mis-design. */
162 static uschar *op_table_underscore[] = {
165 US"quote_local_part",
173 EOP_QUOTE_LOCAL_PART,
178 static uschar *op_table_main[] = {
216 EOP_ADDRESS = sizeof(op_table_underscore)/sizeof(uschar *),
253 /* Table of condition names, and corresponding switch numbers. The names must
254 be in alphabetical order. */
256 static uschar *cond_table[] = {
260 US"==", /* Backward compatibility */
293 US"match_local_part",
318 ECOND_FIRST_DELIVERY,
339 ECOND_MATCH_LOCAL_PART,
349 /* Type for main variable table */
357 /* Type for entries pointing to address/length pairs. Not currently
365 /* Types of table entry */
368 vtype_int, /* value is address of int */
369 vtype_filter_int, /* ditto, but recognized only when filtering */
370 vtype_ino, /* value is address of ino_t (not always an int) */
371 vtype_uid, /* value is address of uid_t (not always an int) */
372 vtype_gid, /* value is address of gid_t (not always an int) */
373 vtype_bool, /* value is address of bool */
374 vtype_stringptr, /* value is address of pointer to string */
375 vtype_msgbody, /* as stringptr, but read when first required */
376 vtype_msgbody_end, /* ditto, the end of the message */
377 vtype_msgheaders, /* the message's headers, processed */
378 vtype_msgheaders_raw, /* the message's headers, unprocessed */
379 vtype_localpart, /* extract local part from string */
380 vtype_domain, /* extract domain from string */
381 vtype_string_func, /* value is string returned by given function */
382 vtype_todbsdin, /* value not used; generate BSD inbox tod */
383 vtype_tode, /* value not used; generate tod in epoch format */
384 vtype_todel, /* value not used; generate tod in epoch/usec format */
385 vtype_todf, /* value not used; generate full tod */
386 vtype_todl, /* value not used; generate log tod */
387 vtype_todlf, /* value not used; generate log file datestamp tod */
388 vtype_todzone, /* value not used; generate time zone only */
389 vtype_todzulu, /* value not used; generate zulu tod */
390 vtype_reply, /* value not used; get reply from headers */
391 vtype_pid, /* value not used; result is pid */
392 vtype_host_lookup, /* value not used; get host name */
393 vtype_load_avg, /* value not used; result is int from os_getloadavg */
394 vtype_pspace, /* partition space; value is T/F for spool/log */
395 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
396 vtype_cert /* SSL certificate */
398 ,vtype_dkim /* Lookup of value in DKIM signature */
402 static uschar * fn_recipients(void);
404 /* This table must be kept in alphabetical order. */
406 static var_entry var_table[] = {
407 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
408 they will be confused with user-creatable ACL variables. */
409 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
410 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
411 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
412 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
413 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
414 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
415 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
416 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
417 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
418 { "acl_narg", vtype_int, &acl_narg },
419 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
420 { "address_data", vtype_stringptr, &deliver_address_data },
421 { "address_file", vtype_stringptr, &address_file },
422 { "address_pipe", vtype_stringptr, &address_pipe },
423 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
424 { "authenticated_id", vtype_stringptr, &authenticated_id },
425 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
426 { "authentication_failed",vtype_int, &authentication_failed },
427 #ifdef WITH_CONTENT_SCAN
428 { "av_failed", vtype_int, &av_failed },
430 #ifdef EXPERIMENTAL_BRIGHTMAIL
431 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
432 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
433 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
434 { "bmi_deliver", vtype_int, &bmi_deliver },
436 { "body_linecount", vtype_int, &body_linecount },
437 { "body_zerocount", vtype_int, &body_zerocount },
438 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
439 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
440 { "caller_gid", vtype_gid, &real_gid },
441 { "caller_uid", vtype_uid, &real_uid },
442 { "compile_date", vtype_stringptr, &version_date },
443 { "compile_number", vtype_stringptr, &version_cnumber },
444 { "csa_status", vtype_stringptr, &csa_status },
445 #ifdef EXPERIMENTAL_DCC
446 { "dcc_header", vtype_stringptr, &dcc_header },
447 { "dcc_result", vtype_stringptr, &dcc_result },
449 #ifdef WITH_OLD_DEMIME
450 { "demime_errorlevel", vtype_int, &demime_errorlevel },
451 { "demime_reason", vtype_stringptr, &demime_reason },
454 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
455 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
456 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
457 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
458 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
459 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
460 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
461 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
462 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
463 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
464 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
465 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
466 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
467 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
468 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
469 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
470 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
471 { "dkim_signers", vtype_stringptr, &dkim_signers },
472 { "dkim_verify_reason", vtype_dkim, (void *)DKIM_VERIFY_REASON },
473 { "dkim_verify_status", vtype_dkim, (void *)DKIM_VERIFY_STATUS},
475 #ifdef EXPERIMENTAL_DMARC
476 { "dmarc_ar_header", vtype_stringptr, &dmarc_ar_header },
477 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
478 { "dmarc_status", vtype_stringptr, &dmarc_status },
479 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
480 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
482 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
483 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
484 { "dnslist_text", vtype_stringptr, &dnslist_text },
485 { "dnslist_value", vtype_stringptr, &dnslist_value },
486 { "domain", vtype_stringptr, &deliver_domain },
487 { "domain_data", vtype_stringptr, &deliver_domain_data },
488 { "exim_gid", vtype_gid, &exim_gid },
489 { "exim_path", vtype_stringptr, &exim_path },
490 { "exim_uid", vtype_uid, &exim_uid },
491 #ifdef WITH_OLD_DEMIME
492 { "found_extension", vtype_stringptr, &found_extension },
494 { "headers_added", vtype_string_func, &fn_hdrs_added },
495 { "home", vtype_stringptr, &deliver_home },
496 { "host", vtype_stringptr, &deliver_host },
497 { "host_address", vtype_stringptr, &deliver_host_address },
498 { "host_data", vtype_stringptr, &host_data },
499 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
500 { "host_lookup_failed", vtype_int, &host_lookup_failed },
501 { "inode", vtype_ino, &deliver_inode },
502 { "interface_address", vtype_stringptr, &interface_address },
503 { "interface_port", vtype_int, &interface_port },
504 { "item", vtype_stringptr, &iterate_item },
506 { "ldap_dn", vtype_stringptr, &eldap_dn },
508 { "load_average", vtype_load_avg, NULL },
509 { "local_part", vtype_stringptr, &deliver_localpart },
510 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
511 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
512 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
513 { "local_scan_data", vtype_stringptr, &local_scan_data },
514 { "local_user_gid", vtype_gid, &local_user_gid },
515 { "local_user_uid", vtype_uid, &local_user_uid },
516 { "localhost_number", vtype_int, &host_number },
517 { "log_inodes", vtype_pinodes, (void *)FALSE },
518 { "log_space", vtype_pspace, (void *)FALSE },
519 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
520 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
521 #ifdef WITH_CONTENT_SCAN
522 { "malware_name", vtype_stringptr, &malware_name },
524 { "max_received_linelength", vtype_int, &max_received_linelength },
525 { "message_age", vtype_int, &message_age },
526 { "message_body", vtype_msgbody, &message_body },
527 { "message_body_end", vtype_msgbody_end, &message_body_end },
528 { "message_body_size", vtype_int, &message_body_size },
529 { "message_exim_id", vtype_stringptr, &message_id },
530 { "message_headers", vtype_msgheaders, NULL },
531 { "message_headers_raw", vtype_msgheaders_raw, NULL },
532 { "message_id", vtype_stringptr, &message_id },
533 { "message_linecount", vtype_int, &message_linecount },
534 { "message_size", vtype_int, &message_size },
535 #ifdef WITH_CONTENT_SCAN
536 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
537 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
538 { "mime_boundary", vtype_stringptr, &mime_boundary },
539 { "mime_charset", vtype_stringptr, &mime_charset },
540 { "mime_content_description", vtype_stringptr, &mime_content_description },
541 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
542 { "mime_content_id", vtype_stringptr, &mime_content_id },
543 { "mime_content_size", vtype_int, &mime_content_size },
544 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
545 { "mime_content_type", vtype_stringptr, &mime_content_type },
546 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
547 { "mime_filename", vtype_stringptr, &mime_filename },
548 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
549 { "mime_is_multipart", vtype_int, &mime_is_multipart },
550 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
551 { "mime_part_count", vtype_int, &mime_part_count },
553 { "n0", vtype_filter_int, &filter_n[0] },
554 { "n1", vtype_filter_int, &filter_n[1] },
555 { "n2", vtype_filter_int, &filter_n[2] },
556 { "n3", vtype_filter_int, &filter_n[3] },
557 { "n4", vtype_filter_int, &filter_n[4] },
558 { "n5", vtype_filter_int, &filter_n[5] },
559 { "n6", vtype_filter_int, &filter_n[6] },
560 { "n7", vtype_filter_int, &filter_n[7] },
561 { "n8", vtype_filter_int, &filter_n[8] },
562 { "n9", vtype_filter_int, &filter_n[9] },
563 { "original_domain", vtype_stringptr, &deliver_domain_orig },
564 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
565 { "originator_gid", vtype_gid, &originator_gid },
566 { "originator_uid", vtype_uid, &originator_uid },
567 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
568 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
569 { "pid", vtype_pid, NULL },
570 { "primary_hostname", vtype_stringptr, &primary_hostname },
571 #ifdef EXPERIMENTAL_PROXY
572 { "proxy_host_address", vtype_stringptr, &proxy_host_address },
573 { "proxy_host_port", vtype_int, &proxy_host_port },
574 { "proxy_session", vtype_bool, &proxy_session },
575 { "proxy_target_address",vtype_stringptr, &proxy_target_address },
576 { "proxy_target_port", vtype_int, &proxy_target_port },
578 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
579 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
580 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
581 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
582 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
583 { "rcpt_count", vtype_int, &rcpt_count },
584 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
585 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
586 { "received_count", vtype_int, &received_count },
587 { "received_for", vtype_stringptr, &received_for },
588 { "received_ip_address", vtype_stringptr, &interface_address },
589 { "received_port", vtype_int, &interface_port },
590 { "received_protocol", vtype_stringptr, &received_protocol },
591 { "received_time", vtype_int, &received_time },
592 { "recipient_data", vtype_stringptr, &recipient_data },
593 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
594 { "recipients", vtype_string_func, &fn_recipients },
595 { "recipients_count", vtype_int, &recipients_count },
596 #ifdef WITH_CONTENT_SCAN
597 { "regex_match_string", vtype_stringptr, ®ex_match_string },
599 { "reply_address", vtype_reply, NULL },
600 { "return_path", vtype_stringptr, &return_path },
601 { "return_size_limit", vtype_int, &bounce_return_size_limit },
602 { "router_name", vtype_stringptr, &router_name },
603 { "runrc", vtype_int, &runrc },
604 { "self_hostname", vtype_stringptr, &self_hostname },
605 { "sender_address", vtype_stringptr, &sender_address },
606 { "sender_address_data", vtype_stringptr, &sender_address_data },
607 { "sender_address_domain", vtype_domain, &sender_address },
608 { "sender_address_local_part", vtype_localpart, &sender_address },
609 { "sender_data", vtype_stringptr, &sender_data },
610 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
611 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
612 { "sender_host_address", vtype_stringptr, &sender_host_address },
613 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
614 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
615 { "sender_host_name", vtype_host_lookup, NULL },
616 { "sender_host_port", vtype_int, &sender_host_port },
617 { "sender_ident", vtype_stringptr, &sender_ident },
618 { "sender_rate", vtype_stringptr, &sender_rate },
619 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
620 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
621 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
622 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
623 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
624 { "sending_port", vtype_int, &sending_port },
625 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
626 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
627 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
628 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
629 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
630 { "sn0", vtype_filter_int, &filter_sn[0] },
631 { "sn1", vtype_filter_int, &filter_sn[1] },
632 { "sn2", vtype_filter_int, &filter_sn[2] },
633 { "sn3", vtype_filter_int, &filter_sn[3] },
634 { "sn4", vtype_filter_int, &filter_sn[4] },
635 { "sn5", vtype_filter_int, &filter_sn[5] },
636 { "sn6", vtype_filter_int, &filter_sn[6] },
637 { "sn7", vtype_filter_int, &filter_sn[7] },
638 { "sn8", vtype_filter_int, &filter_sn[8] },
639 { "sn9", vtype_filter_int, &filter_sn[9] },
640 #ifdef WITH_CONTENT_SCAN
641 { "spam_bar", vtype_stringptr, &spam_bar },
642 { "spam_report", vtype_stringptr, &spam_report },
643 { "spam_score", vtype_stringptr, &spam_score },
644 { "spam_score_int", vtype_stringptr, &spam_score_int },
646 #ifdef EXPERIMENTAL_SPF
647 { "spf_guess", vtype_stringptr, &spf_guess },
648 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
649 { "spf_received", vtype_stringptr, &spf_received },
650 { "spf_result", vtype_stringptr, &spf_result },
651 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
653 { "spool_directory", vtype_stringptr, &spool_directory },
654 { "spool_inodes", vtype_pinodes, (void *)TRUE },
655 { "spool_space", vtype_pspace, (void *)TRUE },
656 #ifdef EXPERIMENTAL_SRS
657 { "srs_db_address", vtype_stringptr, &srs_db_address },
658 { "srs_db_key", vtype_stringptr, &srs_db_key },
659 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
660 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
661 { "srs_recipient", vtype_stringptr, &srs_recipient },
662 { "srs_status", vtype_stringptr, &srs_status },
664 { "thisaddress", vtype_stringptr, &filter_thisaddress },
666 /* The non-(in,out) variables are now deprecated */
667 { "tls_bits", vtype_int, &tls_in.bits },
668 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
669 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
671 { "tls_in_bits", vtype_int, &tls_in.bits },
672 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
673 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
674 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
675 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
676 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
677 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
678 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
680 { "tls_out_bits", vtype_int, &tls_out.bits },
681 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
682 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
683 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
684 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
685 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
686 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
687 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
690 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
691 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
692 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
695 { "tod_bsdinbox", vtype_todbsdin, NULL },
696 { "tod_epoch", vtype_tode, NULL },
697 { "tod_epoch_l", vtype_todel, NULL },
698 { "tod_full", vtype_todf, NULL },
699 { "tod_log", vtype_todl, NULL },
700 { "tod_logfile", vtype_todlf, NULL },
701 { "tod_zone", vtype_todzone, NULL },
702 { "tod_zulu", vtype_todzulu, NULL },
703 #ifdef EXPERIMENTAL_TPDA
704 { "tpda_defer_errno", vtype_int, &tpda_defer_errno },
705 { "tpda_defer_errstr", vtype_stringptr, &tpda_defer_errstr },
706 { "tpda_delivery_confirmation", vtype_stringptr, &tpda_delivery_confirmation },
707 { "tpda_delivery_domain", vtype_stringptr, &tpda_delivery_domain },
708 { "tpda_delivery_fqdn", vtype_stringptr, &tpda_delivery_fqdn },
709 { "tpda_delivery_ip", vtype_stringptr, &tpda_delivery_ip },
710 { "tpda_delivery_local_part",vtype_stringptr,&tpda_delivery_local_part },
711 { "tpda_delivery_port", vtype_int, &tpda_delivery_port },
713 { "transport_name", vtype_stringptr, &transport_name },
714 { "value", vtype_stringptr, &lookup_value },
715 { "version_number", vtype_stringptr, &version_string },
716 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
717 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
718 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
719 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
720 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
721 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
724 static int var_table_size = sizeof(var_table)/sizeof(var_entry);
725 static uschar var_buffer[256];
726 static BOOL malformed_header;
728 /* For textual hashes */
730 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
731 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
734 enum { HMAC_MD5, HMAC_SHA1 };
736 /* For numeric hashes */
738 static unsigned int prime[] = {
739 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
740 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
741 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
743 /* For printing modes in symbolic form */
745 static uschar *mtable_normal[] =
746 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
748 static uschar *mtable_setid[] =
749 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
751 static uschar *mtable_sticky[] =
752 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
756 /*************************************************
757 * Tables for UTF-8 support *
758 *************************************************/
760 /* Table of the number of extra characters, indexed by the first character
761 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
764 static uschar utf8_table1[] = {
765 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
766 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
767 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
768 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
770 /* These are the masks for the data bits in the first byte of a character,
771 indexed by the number of additional bytes. */
773 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
775 /* Get the next UTF-8 character, advancing the pointer. */
777 #define GETUTF8INC(c, ptr) \
779 if ((c & 0xc0) == 0xc0) \
781 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
783 c = (c & utf8_table2[a]) << s; \
787 c |= (*ptr++ & 0x3f) << s; \
792 /*************************************************
793 * Binary chop search on a table *
794 *************************************************/
796 /* This is used for matching expansion items and operators.
799 name the name that is being sought
800 table the table to search
801 table_size the number of items in the table
803 Returns: the offset in the table, or -1
807 chop_match(uschar *name, uschar **table, int table_size)
809 uschar **bot = table;
810 uschar **top = table + table_size;
814 uschar **mid = bot + (top - bot)/2;
815 int c = Ustrcmp(name, *mid);
816 if (c == 0) return mid - table;
817 if (c > 0) bot = mid + 1; else top = mid;
825 /*************************************************
826 * Check a condition string *
827 *************************************************/
829 /* This function is called to expand a string, and test the result for a "true"
830 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
831 forced fail or lookup defer.
833 We used to release all store used, but this is not not safe due
834 to ${dlfunc } and ${acl }. In any case expand_string_internal()
835 is reasonably careful to release what it can.
837 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
840 condition the condition string
841 m1 text to be incorporated in panic error
844 Returns: TRUE if condition is met, FALSE if not
848 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
851 uschar *ss = expand_string(condition);
854 if (!expand_string_forcedfail && !search_find_defer)
855 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
856 "for %s %s: %s", condition, m1, m2, expand_string_message);
859 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
860 strcmpic(ss, US"false") != 0;
867 /*************************************************
868 * Pseudo-random number generation *
869 *************************************************/
871 /* Pseudo-random number generation. The result is not "expected" to be
872 cryptographically strong but not so weak that someone will shoot themselves
873 in the foot using it as a nonce in some email header scheme or whatever
874 weirdness they'll twist this into. The result should ideally handle fork().
876 However, if we're stuck unable to provide this, then we'll fall back to
877 appallingly bad randomness.
879 If SUPPORT_TLS is defined then this will not be used except as an emergency
884 Returns a random number in range [0, max-1]
888 # define vaguely_random_number vaguely_random_number_fallback
891 vaguely_random_number(int max)
894 # undef vaguely_random_number
896 static pid_t pid = 0;
898 #if defined(HAVE_SRANDOM) && !defined(HAVE_SRANDOMDEV)
908 #ifdef HAVE_ARC4RANDOM
909 /* cryptographically strong randomness, common on *BSD platforms, not
910 so much elsewhere. Alas. */
912 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
913 #ifdef HAVE_SRANDOMDEV
914 /* uses random(4) for seeding */
917 gettimeofday(&tv, NULL);
918 srandom(tv.tv_sec | tv.tv_usec | getpid());
921 /* Poor randomness and no seeding here */
928 #ifdef HAVE_ARC4RANDOM
929 return arc4random() % max;
930 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
931 return random() % max;
933 /* This one returns a 16-bit number, definitely not crypto-strong */
934 return random_number(max);
941 /*************************************************
942 * Pick out a name from a string *
943 *************************************************/
945 /* If the name is too long, it is silently truncated.
948 name points to a buffer into which to put the name
949 max is the length of the buffer
950 s points to the first alphabetic character of the name
951 extras chars other than alphanumerics to permit
953 Returns: pointer to the first character after the name
955 Note: The test for *s != 0 in the while loop is necessary because
956 Ustrchr() yields non-NULL if the character is zero (which is not something
960 read_name(uschar *name, int max, uschar *s, uschar *extras)
963 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
965 if (ptr < max-1) name[ptr++] = *s;
974 /*************************************************
975 * Pick out the rest of a header name *
976 *************************************************/
978 /* A variable name starting $header_ (or just $h_ for those who like
979 abbreviations) might not be the complete header name because headers can
980 contain any printing characters in their names, except ':'. This function is
981 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
982 on the end, if the name was terminated by white space.
985 name points to a buffer in which the name read so far exists
986 max is the length of the buffer
987 s points to the first character after the name so far, i.e. the
988 first non-alphameric character after $header_xxxxx
990 Returns: a pointer to the first character after the header name
994 read_header_name(uschar *name, int max, uschar *s)
996 int prelen = Ustrchr(name, '_') - name + 1;
997 int ptr = Ustrlen(name) - prelen;
998 if (ptr > 0) memmove(name, name+prelen, ptr);
999 while (mac_isgraph(*s) && *s != ':')
1001 if (ptr < max-1) name[ptr++] = *s;
1012 /*************************************************
1013 * Pick out a number from a string *
1014 *************************************************/
1017 n points to an integer into which to put the number
1018 s points to the first digit of the number
1020 Returns: a pointer to the character after the last digit
1024 read_number(int *n, uschar *s)
1027 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1033 /*************************************************
1034 * Extract keyed subfield from a string *
1035 *************************************************/
1037 /* The yield is in dynamic store; NULL means that the key was not found.
1040 key points to the name of the key
1041 s points to the string from which to extract the subfield
1043 Returns: NULL if the subfield was not found, or
1044 a pointer to the subfield's data
1048 expand_getkeyed(uschar *key, uschar *s)
1050 int length = Ustrlen(key);
1051 while (isspace(*s)) s++;
1053 /* Loop to search for the key */
1061 while (*s != 0 && *s != '=' && !isspace(*s)) s++;
1062 dkeylength = s - dkey;
1063 while (isspace(*s)) s++;
1064 if (*s == '=') while (isspace((*(++s))));
1066 data = string_dequote(&s);
1067 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1070 while (isspace(*s)) s++;
1079 find_var_ent(uschar * name)
1082 int last = var_table_size;
1084 while (last > first)
1086 int middle = (first + last)/2;
1087 int c = Ustrcmp(name, var_table[middle].name);
1089 if (c > 0) { first = middle + 1; continue; }
1090 if (c < 0) { last = middle; continue; }
1091 return &var_table[middle];
1096 /*************************************************
1097 * Extract numbered subfield from string *
1098 *************************************************/
1100 /* Extracts a numbered field from a string that is divided by tokens - for
1101 example a line from /etc/passwd is divided by colon characters. First field is
1102 numbered one. Negative arguments count from the right. Zero returns the whole
1103 string. Returns NULL if there are insufficient tokens in the string
1106 Modifies final argument - this is a dynamically generated string, so that's OK.
1109 field number of field to be extracted,
1110 first field = 1, whole string = 0, last field = -1
1111 separators characters that are used to break string into tokens
1112 s points to the string from which to extract the subfield
1114 Returns: NULL if the field was not found,
1115 a pointer to the field's data inside s (modified to add 0)
1119 expand_gettokened (int field, uschar *separators, uschar *s)
1124 uschar *fieldtext = NULL;
1126 if (field == 0) return s;
1128 /* Break the line up into fields in place; for field > 0 we stop when we have
1129 done the number of fields we want. For field < 0 we continue till the end of
1130 the string, counting the number of fields. */
1132 count = (field > 0)? field : INT_MAX;
1138 /* Previous field was the last one in the string. For a positive field
1139 number, this means there are not enough fields. For a negative field number,
1140 check that there are enough, and scan back to find the one that is wanted. */
1144 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1145 if ((-field) == (INT_MAX - count - 1)) return s;
1149 while (ss[-1] != 0) ss--;
1155 /* Previous field was not last in the string; save its start and put a
1159 len = Ustrcspn(ss, separators);
1170 expand_getlistele(int field, uschar * list)
1172 uschar * tlist= list;
1178 for(field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1181 if(field==0) return NULL;
1182 while(--field>0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1183 return string_nextinlist(&list, &sep, NULL, 0);
1187 /* Certificate fields, by name. Worry about by-OID later */
1188 /* Names are chosen to not have common prefixes */
1195 uschar * (*getfn)(void * cert, uschar * mod);
1197 static certfield certfields[] =
1198 { /* linear search; no special order */
1199 { US"version", 7, &tls_cert_version },
1200 { US"serial_number", 13, &tls_cert_serial_number },
1201 { US"subject", 7, &tls_cert_subject },
1202 { US"notbefore", 9, &tls_cert_not_before },
1203 { US"notafter", 8, &tls_cert_not_after },
1204 { US"issuer", 6, &tls_cert_issuer },
1205 { US"signature", 9, &tls_cert_signature },
1206 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1207 { US"subj_altname", 12, &tls_cert_subject_altname },
1208 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1209 { US"crl_uri", 7, &tls_cert_crl_uri },
1213 expand_getcertele(uschar * field, uschar * certvar)
1218 if (!(vp = find_var_ent(certvar)))
1220 expand_string_message =
1221 string_sprintf("no variable named \"%s\"", certvar);
1222 return NULL; /* Unknown variable name */
1224 /* NB this stops us passing certs around in variable. Might
1225 want to do that in future */
1226 if (vp->type != vtype_cert)
1228 expand_string_message =
1229 string_sprintf("\"%s\" is not a certificate", certvar);
1230 return NULL; /* Unknown variable name */
1232 if (!*(void **)vp->value)
1235 if (*field >= '0' && *field <= '9')
1236 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1238 for(cp = certfields;
1239 cp < certfields + nelements(certfields);
1241 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1243 uschar * modifier = *(field += cp->namelen) == ','
1245 return (*cp->getfn)( *(void **)vp->value, modifier );
1248 expand_string_message =
1249 string_sprintf("bad field selector \"%s\" for certextract", field);
1252 #endif /*SUPPORT_TLS*/
1254 /*************************************************
1255 * Extract a substring from a string *
1256 *************************************************/
1258 /* Perform the ${substr or ${length expansion operations.
1261 subject the input string
1262 value1 the offset from the start of the input string to the start of
1263 the output string; if negative, count from the right.
1264 value2 the length of the output string, or negative (-1) for unset
1265 if value1 is positive, unset means "all after"
1266 if value1 is negative, unset means "all before"
1267 len set to the length of the returned string
1269 Returns: pointer to the output string, or NULL if there is an error
1273 extract_substr(uschar *subject, int value1, int value2, int *len)
1275 int sublen = Ustrlen(subject);
1277 if (value1 < 0) /* count from right */
1281 /* If the position is before the start, skip to the start, and adjust the
1282 length. If the length ends up negative, the substring is null because nothing
1283 can precede. This falls out naturally when the length is unset, meaning "all
1289 if (value2 < 0) value2 = 0;
1293 /* Otherwise an unset length => characters before value1 */
1295 else if (value2 < 0)
1302 /* For a non-negative offset, if the starting position is past the end of the
1303 string, the result will be the null string. Otherwise, an unset length means
1304 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1308 if (value1 > sublen)
1313 else if (value2 < 0) value2 = sublen;
1316 /* Cut the length down to the maximum possible for the offset value, and get
1317 the required characters. */
1319 if (value1 + value2 > sublen) value2 = sublen - value1;
1321 return subject + value1;
1327 /*************************************************
1328 * Old-style hash of a string *
1329 *************************************************/
1331 /* Perform the ${hash expansion operation.
1334 subject the input string (an expanded substring)
1335 value1 the length of the output string; if greater or equal to the
1336 length of the input string, the input string is returned
1337 value2 the number of hash characters to use, or 26 if negative
1338 len set to the length of the returned string
1340 Returns: pointer to the output string, or NULL if there is an error
1344 compute_hash(uschar *subject, int value1, int value2, int *len)
1346 int sublen = Ustrlen(subject);
1348 if (value2 < 0) value2 = 26;
1349 else if (value2 > Ustrlen(hashcodes))
1351 expand_string_message =
1352 string_sprintf("hash count \"%d\" too big", value2);
1356 /* Calculate the hash text. We know it is shorter than the original string, so
1357 can safely place it in subject[] (we know that subject is always itself an
1358 expanded substring). */
1360 if (value1 < sublen)
1365 while ((c = (subject[j])) != 0)
1367 int shift = (c + j++) & 7;
1368 subject[i] ^= (c << shift) | (c >> (8-shift));
1369 if (++i >= value1) i = 0;
1371 for (i = 0; i < value1; i++)
1372 subject[i] = hashcodes[(subject[i]) % value2];
1374 else value1 = sublen;
1383 /*************************************************
1384 * Numeric hash of a string *
1385 *************************************************/
1387 /* Perform the ${nhash expansion operation. The first characters of the
1388 string are treated as most important, and get the highest prime numbers.
1391 subject the input string
1392 value1 the maximum value of the first part of the result
1393 value2 the maximum value of the second part of the result,
1394 or negative to produce only a one-part result
1395 len set to the length of the returned string
1397 Returns: pointer to the output string, or NULL if there is an error.
1401 compute_nhash (uschar *subject, int value1, int value2, int *len)
1403 uschar *s = subject;
1405 unsigned long int total = 0; /* no overflow */
1409 if (i == 0) i = sizeof(prime)/sizeof(int) - 1;
1410 total += prime[i--] * (unsigned int)(*s++);
1413 /* If value2 is unset, just compute one number */
1417 s = string_sprintf("%d", total % value1);
1420 /* Otherwise do a div/mod hash */
1424 total = total % (value1 * value2);
1425 s = string_sprintf("%d/%d", total/value2, total % value2);
1436 /*************************************************
1437 * Find the value of a header or headers *
1438 *************************************************/
1440 /* Multiple instances of the same header get concatenated, and this function
1441 can also return a concatenation of all the header lines. When concatenating
1442 specific headers that contain lists of addresses, a comma is inserted between
1443 them. Otherwise we use a straight concatenation. Because some messages can have
1444 pathologically large number of lines, there is a limit on the length that is
1445 returned. Also, to avoid massive store use which would result from using
1446 string_cat() as it copies and extends strings, we do a preliminary pass to find
1447 out exactly how much store will be needed. On "normal" messages this will be
1451 name the name of the header, without the leading $header_ or $h_,
1452 or NULL if a concatenation of all headers is required
1453 exists_only TRUE if called from a def: test; don't need to build a string;
1454 just return a string that is not "" and not "0" if the header
1456 newsize return the size of memory block that was obtained; may be NULL
1457 if exists_only is TRUE
1458 want_raw TRUE if called for $rh_ or $rheader_ variables; no processing,
1459 other than concatenating, will be done on the header. Also used
1460 for $message_headers_raw.
1461 charset name of charset to translate MIME words to; used only if
1462 want_raw is false; if NULL, no translation is done (this is
1463 used for $bh_ and $bheader_)
1465 Returns: NULL if the header does not exist, else a pointer to a new
1470 find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw,
1473 BOOL found = name == NULL;
1475 int len = found? 0 : Ustrlen(name);
1477 uschar *yield = NULL;
1480 /* Loop for two passes - saves code repetition */
1482 for (i = 0; i < 2; i++)
1487 for (h = header_list; size < header_insert_maxlen && h != NULL; h = h->next)
1489 if (h->type != htype_old && h->text != NULL) /* NULL => Received: placeholder */
1491 if (name == NULL || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1496 if (exists_only) return US"1"; /* don't need actual string */
1498 t = h->text + len; /* text to insert */
1499 if (!want_raw) /* unless wanted raw, */
1500 while (isspace(*t)) t++; /* remove leading white space */
1501 ilen = h->slen - (t - h->text); /* length to insert */
1503 /* Unless wanted raw, remove trailing whitespace, including the
1507 while (ilen > 0 && isspace(t[ilen-1])) ilen--;
1509 /* Set comma = 1 if handling a single header and it's one of those
1510 that contains an address list, except when asked for raw headers. Only
1511 need to do this once. */
1513 if (!want_raw && name != NULL && comma == 0 &&
1514 Ustrchr("BCFRST", h->type) != NULL)
1517 /* First pass - compute total store needed; second pass - compute
1518 total store used, including this header. */
1520 size += ilen + comma + 1; /* +1 for the newline */
1522 /* Second pass - concatentate the data, up to a maximum. Note that
1523 the loop stops when size hits the limit. */
1527 if (size > header_insert_maxlen)
1529 ilen -= size - header_insert_maxlen - 1;
1532 Ustrncpy(ptr, t, ilen);
1535 /* For a non-raw header, put in the comma if needed, then add
1536 back the newline we removed above, provided there was some text in
1539 if (!want_raw && ilen > 0)
1541 if (comma != 0) *ptr++ = ',';
1549 /* At end of first pass, return NULL if no header found. Then truncate size
1550 if necessary, and get the buffer to hold the data, returning the buffer size.
1555 if (!found) return NULL;
1556 if (size > header_insert_maxlen) size = header_insert_maxlen;
1557 *newsize = size + 1;
1558 ptr = yield = store_get(*newsize);
1562 /* That's all we do for raw header expansion. */
1569 /* Otherwise, remove a final newline and a redundant added comma. Then we do
1570 RFC 2047 decoding, translating the charset if requested. The rfc2047_decode2()
1571 function can return an error with decoded data if the charset translation
1572 fails. If decoding fails, it returns NULL. */
1576 uschar *decoded, *error;
1577 if (ptr > yield && ptr[-1] == '\n') ptr--;
1578 if (ptr > yield && comma != 0 && ptr[-1] == ',') ptr--;
1580 decoded = rfc2047_decode2(yield, check_rfc2047_length, charset, '?', NULL,
1584 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1585 " input was: %s\n", error, yield);
1587 if (decoded != NULL) yield = decoded;
1596 /*************************************************
1597 * Return list of recipients *
1598 *************************************************/
1599 /* A recipients list is available only during system message filtering,
1600 during ACL processing after DATA, and while expanding pipe commands
1601 generated from a system filter, but not elsewhere. */
1606 if (!enable_dollar_recipients) return NULL; else
1611 uschar * s = store_get(size);
1612 for (i = 0; i < recipients_count; i++)
1614 if (i != 0) s = string_cat(s, &size, &ptr, US", ", 2);
1615 s = string_cat(s, &size, &ptr, recipients_list[i].address,
1616 Ustrlen(recipients_list[i].address));
1618 s[ptr] = 0; /* string_cat() leaves room */
1624 /*************************************************
1625 * Find value of a variable *
1626 *************************************************/
1628 /* The table of variables is kept in alphabetic order, so we can search it
1629 using a binary chop. The "choplen" variable is nothing to do with the binary
1633 name the name of the variable being sought
1634 exists_only TRUE if this is a def: test; passed on to find_header()
1635 skipping TRUE => skip any processing evaluation; this is not the same as
1636 exists_only because def: may test for values that are first
1638 newsize pointer to an int which is initially zero; if the answer is in
1639 a new memory buffer, *newsize is set to its size
1641 Returns: NULL if the variable does not exist, or
1642 a pointer to the variable's contents, or
1643 something non-NULL if exists_only is TRUE
1647 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1654 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1655 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1656 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1657 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1658 (this gave backwards compatibility at the changeover). There may be built-in
1659 variables whose names start acl_ but they should never start in this way. This
1660 slightly messy specification is a consequence of the history, needless to say.
1662 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1663 set, in which case give an error. */
1665 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1669 tree_search((name[4] == 'c')? acl_var_c : acl_var_m, name + 4);
1670 return (node == NULL)? (strict_acl_vars? NULL : US"") : node->data.ptr;
1673 /* Handle $auth<n> variables. */
1675 if (Ustrncmp(name, "auth", 4) == 0)
1678 int n = Ustrtoul(name + 4, &endptr, 10);
1679 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1680 return (auth_vars[n-1] == NULL)? US"" : auth_vars[n-1];
1683 /* For all other variables, search the table */
1685 if (!(vp = find_var_ent(name)))
1686 return NULL; /* Unknown variable name */
1688 /* Found an existing variable. If in skipping state, the value isn't needed,
1689 and we want to avoid processing (such as looking up the host name). */
1697 case vtype_filter_int:
1698 if (!filter_running) return NULL;
1702 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1706 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1710 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1714 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1718 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1721 case vtype_stringptr: /* Pointer to string */
1722 s = *((uschar **)(val));
1723 return (s == NULL)? US"" : s;
1726 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1729 case vtype_load_avg:
1730 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1733 case vtype_host_lookup: /* Lookup if not done so */
1734 if (sender_host_name == NULL && sender_host_address != NULL &&
1735 !host_lookup_failed && host_name_lookup() == OK)
1736 host_build_sender_fullhost();
1737 return (sender_host_name == NULL)? US"" : sender_host_name;
1739 case vtype_localpart: /* Get local part from address */
1740 s = *((uschar **)(val));
1741 if (s == NULL) return US"";
1742 domain = Ustrrchr(s, '@');
1743 if (domain == NULL) return s;
1744 if (domain - s > sizeof(var_buffer) - 1)
1745 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1746 " in string expansion", sizeof(var_buffer));
1747 Ustrncpy(var_buffer, s, domain - s);
1748 var_buffer[domain - s] = 0;
1751 case vtype_domain: /* Get domain from address */
1752 s = *((uschar **)(val));
1753 if (s == NULL) return US"";
1754 domain = Ustrrchr(s, '@');
1755 return (domain == NULL)? US"" : domain + 1;
1757 case vtype_msgheaders:
1758 return find_header(NULL, exists_only, newsize, FALSE, NULL);
1760 case vtype_msgheaders_raw:
1761 return find_header(NULL, exists_only, newsize, TRUE, NULL);
1763 case vtype_msgbody: /* Pointer to msgbody string */
1764 case vtype_msgbody_end: /* Ditto, the end of the msg */
1765 ss = (uschar **)(val);
1766 if (*ss == NULL && deliver_datafile >= 0) /* Read body when needed */
1769 off_t start_offset = SPOOL_DATA_START_OFFSET;
1770 int len = message_body_visible;
1771 if (len > message_size) len = message_size;
1772 *ss = body = store_malloc(len+1);
1774 if (vp->type == vtype_msgbody_end)
1776 struct stat statbuf;
1777 if (fstat(deliver_datafile, &statbuf) == 0)
1779 start_offset = statbuf.st_size - len;
1780 if (start_offset < SPOOL_DATA_START_OFFSET)
1781 start_offset = SPOOL_DATA_START_OFFSET;
1784 lseek(deliver_datafile, start_offset, SEEK_SET);
1785 len = read(deliver_datafile, body, len);
1789 if (message_body_newlines) /* Separate loops for efficiency */
1792 { if (body[--len] == 0) body[len] = ' '; }
1797 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1801 return (*ss == NULL)? US"" : *ss;
1803 case vtype_todbsdin: /* BSD inbox time of day */
1804 return tod_stamp(tod_bsdin);
1806 case vtype_tode: /* Unix epoch time of day */
1807 return tod_stamp(tod_epoch);
1809 case vtype_todel: /* Unix epoch/usec time of day */
1810 return tod_stamp(tod_epoch_l);
1812 case vtype_todf: /* Full time of day */
1813 return tod_stamp(tod_full);
1815 case vtype_todl: /* Log format time of day */
1816 return tod_stamp(tod_log_bare); /* (without timezone) */
1818 case vtype_todzone: /* Time zone offset only */
1819 return tod_stamp(tod_zone);
1821 case vtype_todzulu: /* Zulu time */
1822 return tod_stamp(tod_zulu);
1824 case vtype_todlf: /* Log file datestamp tod */
1825 return tod_stamp(tod_log_datestamp_daily);
1827 case vtype_reply: /* Get reply address */
1828 s = find_header(US"reply-to:", exists_only, newsize, TRUE,
1830 if (s != NULL) while (isspace(*s)) s++;
1831 if (s == NULL || *s == 0)
1833 *newsize = 0; /* For the *s==0 case */
1834 s = find_header(US"from:", exists_only, newsize, TRUE, headers_charset);
1839 while (isspace(*s)) s++;
1840 for (t = s; *t != 0; t++) if (*t == '\n') *t = ' ';
1841 while (t > s && isspace(t[-1])) t--;
1844 return (s == NULL)? US"" : s;
1846 case vtype_string_func:
1848 uschar * (*fn)() = val;
1855 sprintf(CS var_buffer, "%d",
1856 receive_statvfs(val == (void *)TRUE, &inodes));
1863 (void) receive_statvfs(val == (void *)TRUE, &inodes);
1864 sprintf(CS var_buffer, "%d", inodes);
1869 return *(void **)val ? US"<cert>" : US"";
1871 #ifndef DISABLE_DKIM
1873 return dkim_exim_expand_query((int)(long)val);
1883 modify_variable(uschar *name, void * value)
1886 if ((vp = find_var_ent(name))) vp->value = value;
1887 return; /* Unknown variable name, fail silently */
1894 /*************************************************
1895 * Read and expand substrings *
1896 *************************************************/
1898 /* This function is called to read and expand argument substrings for various
1899 expansion items. Some have a minimum requirement that is less than the maximum;
1900 in these cases, the first non-present one is set to NULL.
1903 sub points to vector of pointers to set
1904 n maximum number of substrings
1906 sptr points to current string pointer
1907 skipping the skipping flag
1908 check_end if TRUE, check for final '}'
1909 name name of item, for error message
1910 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
1913 Returns: 0 OK; string pointer updated
1914 1 curly bracketing error (too few arguments)
1915 2 too many arguments (only if check_end is set); message set
1916 3 other error (expansion failure)
1920 read_subs(uschar **sub, int n, int m, uschar **sptr, BOOL skipping,
1921 BOOL check_end, uschar *name, BOOL *resetok)
1926 while (isspace(*s)) s++;
1927 for (i = 0; i < n; i++)
1931 if (i < m) return 1;
1935 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok);
1936 if (sub[i] == NULL) return 3;
1937 if (*s++ != '}') return 1;
1938 while (isspace(*s)) s++;
1940 if (check_end && *s++ != '}')
1944 expand_string_message = string_sprintf("Too many arguments for \"%s\" "
1945 "(max is %d)", name, n);
1958 /*************************************************
1959 * Elaborate message for bad variable *
1960 *************************************************/
1962 /* For the "unknown variable" message, take a look at the variable's name, and
1963 give additional information about possible ACL variables. The extra information
1964 is added on to expand_string_message.
1966 Argument: the name of the variable
1971 check_variable_error_message(uschar *name)
1973 if (Ustrncmp(name, "acl_", 4) == 0)
1974 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
1975 (name[4] == 'c' || name[4] == 'm')?
1977 US"6th character of a user-defined ACL variable must be a digit or underscore" :
1978 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
1980 US"user-defined ACL variables must start acl_c or acl_m");
1986 Load args from sub array to globals, and call acl_check().
1987 Sub array will be corrupted on return.
1989 Returns: OK access is granted by an ACCEPT verb
1990 DISCARD access is granted by a DISCARD verb
1991 FAIL access is denied
1992 FAIL_DROP access is denied; drop the connection
1993 DEFER can't tell at the moment
1997 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2001 int sav_narg = acl_narg;
2003 extern int acl_where;
2005 if(--nsub > sizeof(acl_arg)/sizeof(*acl_arg)) nsub = sizeof(acl_arg)/sizeof(*acl_arg);
2006 for (i = 0; i < nsub && sub[i+1]; i++)
2009 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2010 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2015 sub[i+1] = acl_arg[i];
2016 acl_arg[i++] = NULL;
2020 debug_printf("expanding: acl: %s arg: %s%s\n",
2022 acl_narg>0 ? acl_arg[0] : US"<none>",
2023 acl_narg>1 ? " +more" : "");
2025 ret = acl_eval(acl_where, sub[0], user_msgp, &tmp);
2027 for (i = 0; i < nsub; i++)
2028 acl_arg[i] = sub[i+1]; /* restore old args */
2029 acl_narg = sav_narg;
2037 /*************************************************
2038 * Read and evaluate a condition *
2039 *************************************************/
2043 s points to the start of the condition text
2044 resetok points to a BOOL which is written false if it is unsafe to
2045 free memory. Certain condition types (acl) may have side-effect
2046 allocation which must be preserved.
2047 yield points to a BOOL to hold the result of the condition test;
2048 if NULL, we are just reading through a condition that is
2049 part of an "or" combination to check syntax, or in a state
2050 where the answer isn't required
2052 Returns: a pointer to the first character after the condition, or
2057 eval_condition(uschar *s, BOOL *resetok, BOOL *yield)
2059 BOOL testfor = TRUE;
2060 BOOL tempcond, combined_cond;
2062 BOOL sub2_honour_dollar = TRUE;
2063 int i, rc, cond_type, roffset;
2064 int_eximarith_t num[2];
2065 struct stat statbuf;
2070 const uschar *rerror;
2074 while (isspace(*s)) s++;
2075 if (*s == '!') { testfor = !testfor; s++; } else break;
2078 /* Numeric comparisons are symbolic */
2080 if (*s == '=' || *s == '>' || *s == '<')
2092 /* All other conditions are named */
2094 else s = read_name(name, 256, s, US"_");
2096 /* If we haven't read a name, it means some non-alpha character is first. */
2100 expand_string_message = string_sprintf("condition name expected, "
2101 "but found \"%.16s\"", s);
2105 /* Find which condition we are dealing with, and switch on it */
2107 cond_type = chop_match(name, cond_table, sizeof(cond_table)/sizeof(uschar *));
2110 /* def: tests for a non-empty variable, or for the existence of a header. If
2111 yield == NULL we are in a skipping state, and don't care about the answer. */
2116 expand_string_message = US"\":\" expected after \"def\"";
2120 s = read_name(name, 256, s+1, US"_");
2122 /* Test for a header's existence. If the name contains a closing brace
2123 character, this may be a user error where the terminating colon has been
2124 omitted. Set a flag to adjust a subsequent error message in this case. */
2126 if (Ustrncmp(name, "h_", 2) == 0 ||
2127 Ustrncmp(name, "rh_", 3) == 0 ||
2128 Ustrncmp(name, "bh_", 3) == 0 ||
2129 Ustrncmp(name, "header_", 7) == 0 ||
2130 Ustrncmp(name, "rheader_", 8) == 0 ||
2131 Ustrncmp(name, "bheader_", 8) == 0)
2133 s = read_header_name(name, 256, s);
2134 /* {-for-text-editors */
2135 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2136 if (yield != NULL) *yield =
2137 (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor;
2140 /* Test for a variable's having a non-empty value. A non-existent variable
2141 causes an expansion failure. */
2145 uschar *value = find_variable(name, TRUE, yield == NULL, NULL);
2148 expand_string_message = (name[0] == 0)?
2149 string_sprintf("variable name omitted after \"def:\"") :
2150 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
2151 check_variable_error_message(name);
2154 if (yield != NULL) *yield = (value[0] != 0) == testfor;
2160 /* first_delivery tests for first delivery attempt */
2162 case ECOND_FIRST_DELIVERY:
2163 if (yield != NULL) *yield = deliver_firsttime == testfor;
2167 /* queue_running tests for any process started by a queue runner */
2169 case ECOND_QUEUE_RUNNING:
2170 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
2174 /* exists: tests for file existence
2175 isip: tests for any IP address
2176 isip4: tests for an IPv4 address
2177 isip6: tests for an IPv6 address
2178 pam: does PAM authentication
2179 radius: does RADIUS authentication
2180 ldapauth: does LDAP authentication
2181 pwcheck: does Cyrus SASL pwcheck authentication
2190 case ECOND_LDAPAUTH:
2193 while (isspace(*s)) s++;
2194 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2196 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2197 if (sub[0] == NULL) return NULL;
2198 /* {-for-text-editors */
2199 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2201 if (yield == NULL) return s; /* No need to run the test if skipping */
2206 if ((expand_forbid & RDO_EXISTS) != 0)
2208 expand_string_message = US"File existence tests are not permitted";
2211 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2217 rc = string_is_ip_address(sub[0], NULL);
2218 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2219 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2222 /* Various authentication tests - all optionally compiled */
2226 rc = auth_call_pam(sub[0], &expand_string_message);
2229 goto COND_FAILED_NOT_COMPILED;
2230 #endif /* SUPPORT_PAM */
2233 #ifdef RADIUS_CONFIG_FILE
2234 rc = auth_call_radius(sub[0], &expand_string_message);
2237 goto COND_FAILED_NOT_COMPILED;
2238 #endif /* RADIUS_CONFIG_FILE */
2240 case ECOND_LDAPAUTH:
2243 /* Just to keep the interface the same */
2245 int old_pool = store_pool;
2246 store_pool = POOL_SEARCH;
2247 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2248 &expand_string_message, &do_cache);
2249 store_pool = old_pool;
2253 goto COND_FAILED_NOT_COMPILED;
2254 #endif /* LOOKUP_LDAP */
2257 #ifdef CYRUS_PWCHECK_SOCKET
2258 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2261 goto COND_FAILED_NOT_COMPILED;
2262 #endif /* CYRUS_PWCHECK_SOCKET */
2264 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2265 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2267 if (rc == ERROR || rc == DEFER) return NULL;
2268 *yield = (rc == OK) == testfor;
2274 /* call ACL (in a conditional context). Accept true, deny false.
2275 Defer is a forced-fail. Anything set by message= goes to $value.
2276 Up to ten parameters are used; we use the braces round the name+args
2277 like the saslauthd condition does, to permit a variable number of args.
2278 See also the expansion-item version EITEM_ACL and the traditional
2279 acl modifier ACLC_ACL.
2280 Since the ACL may allocate new global variables, tell our caller to not
2285 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2292 while (isspace(*s)) s++;
2293 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2295 switch(read_subs(sub, sizeof(sub)/sizeof(*sub), 1,
2296 &s, yield == NULL, TRUE, US"acl", resetok))
2298 case 1: expand_string_message = US"too few arguments or bracketing "
2301 case 3: return NULL;
2305 if (yield != NULL) switch(eval_acl(sub, sizeof(sub)/sizeof(*sub), &user_msg))
2310 lookup_value = NULL;
2313 lookup_value = string_cat(NULL, &size, &ptr, user_msg, Ustrlen(user_msg));
2314 lookup_value[ptr] = '\0';
2316 *yield = cond == testfor;
2320 expand_string_forcedfail = TRUE;
2322 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
2329 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2331 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2333 However, the last two are optional. That is why the whole set is enclosed
2334 in their own set of braces. */
2336 case ECOND_SASLAUTHD:
2337 #ifndef CYRUS_SASLAUTHD_SOCKET
2338 goto COND_FAILED_NOT_COMPILED;
2340 while (isspace(*s)) s++;
2341 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2342 switch(read_subs(sub, 4, 2, &s, yield == NULL, TRUE, US"saslauthd", resetok))
2344 case 1: expand_string_message = US"too few arguments or bracketing "
2345 "error for saslauthd";
2347 case 3: return NULL;
2349 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
2353 rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2354 &expand_string_message);
2355 if (rc == ERROR || rc == DEFER) return NULL;
2356 *yield = (rc == OK) == testfor;
2359 #endif /* CYRUS_SASLAUTHD_SOCKET */
2362 /* symbolic operators for numeric and string comparison, and a number of
2363 other operators, all requiring two arguments.
2365 crypteq: encrypts plaintext and compares against an encrypted text,
2366 using crypt(), crypt16(), MD5 or SHA-1
2367 inlist/inlisti: checks if first argument is in the list of the second
2368 match: does a regular expression match and sets up the numerical
2369 variables if it succeeds
2370 match_address: matches in an address list
2371 match_domain: matches in a domain list
2372 match_ip: matches a host list that is restricted to IP addresses
2373 match_local_part: matches in a local part list
2376 case ECOND_MATCH_ADDRESS:
2377 case ECOND_MATCH_DOMAIN:
2378 case ECOND_MATCH_IP:
2379 case ECOND_MATCH_LOCAL_PART:
2380 #ifndef EXPAND_LISTMATCH_RHS
2381 sub2_honour_dollar = FALSE;
2390 case ECOND_NUM_L: /* Numerical comparisons */
2397 case ECOND_STR_LT: /* String comparisons */
2408 for (i = 0; i < 2; i++)
2410 /* Sometimes, we don't expand substrings; too many insecure configurations
2411 created using match_address{}{} and friends, where the second param
2412 includes information from untrustworthy sources. */
2413 BOOL honour_dollar = TRUE;
2414 if ((i > 0) && !sub2_honour_dollar)
2415 honour_dollar = FALSE;
2417 while (isspace(*s)) s++;
2420 if (i == 0) goto COND_FAILED_CURLY_START;
2421 expand_string_message = string_sprintf("missing 2nd string in {} "
2422 "after \"%s\"", name);
2425 sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2426 honour_dollar, resetok);
2427 if (sub[i] == NULL) return NULL;
2428 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2430 /* Convert to numerical if required; we know that the names of all the
2431 conditions that compare numbers do not start with a letter. This just saves
2432 checking for them individually. */
2434 if (!isalpha(name[0]) && yield != NULL)
2440 debug_printf("empty string cast to zero for numerical comparison\n");
2444 num[i] = expand_string_integer(sub[i], FALSE);
2445 if (expand_string_message != NULL) return NULL;
2450 /* Result not required */
2452 if (yield == NULL) return s;
2454 /* Do an appropriate comparison */
2460 tempcond = (num[0] == num[1]);
2464 tempcond = (num[0] > num[1]);
2468 tempcond = (num[0] >= num[1]);
2472 tempcond = (num[0] < num[1]);
2476 tempcond = (num[0] <= num[1]);
2480 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2484 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2488 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2492 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2496 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2500 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2504 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2508 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2512 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2516 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2519 case ECOND_MATCH: /* Regular expression match */
2520 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
2524 expand_string_message = string_sprintf("regular expression error in "
2525 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2528 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2531 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2532 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2533 goto MATCHED_SOMETHING;
2535 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2536 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2537 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2538 goto MATCHED_SOMETHING;
2540 case ECOND_MATCH_IP: /* Match IP address in a host list */
2541 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2543 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2549 unsigned int *nullcache = NULL;
2550 check_host_block cb;
2552 cb.host_name = US"";
2553 cb.host_address = sub[0];
2555 /* If the host address starts off ::ffff: it is an IPv6 address in
2556 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2559 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2560 cb.host_address + 7 : cb.host_address;
2562 rc = match_check_list(
2563 &sub[1], /* the list */
2564 0, /* separator character */
2565 &hostlist_anchor, /* anchor pointer */
2566 &nullcache, /* cache pointer */
2567 check_host, /* function for testing */
2568 &cb, /* argument for function */
2569 MCL_HOST, /* type of check */
2570 sub[0], /* text for debugging */
2571 NULL); /* where to pass back data */
2573 goto MATCHED_SOMETHING;
2575 case ECOND_MATCH_LOCAL_PART:
2576 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2577 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
2592 expand_string_message = string_sprintf("unable to complete match "
2593 "against \"%s\": %s", sub[1], search_error_message);
2599 /* Various "encrypted" comparisons. If the second string starts with
2600 "{" then an encryption type is given. Default to crypt() or crypt16()
2601 (build-time choice). */
2602 /* }-for-text-editors */
2605 #ifndef SUPPORT_CRYPTEQ
2606 goto COND_FAILED_NOT_COMPILED;
2608 if (strncmpic(sub[1], US"{md5}", 5) == 0)
2610 int sublen = Ustrlen(sub[1]+5);
2615 md5_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
2617 /* If the length that we are comparing against is 24, the MD5 digest
2618 is expressed as a base64 string. This is the way LDAP does it. However,
2619 some other software uses a straightforward hex representation. We assume
2620 this if the length is 32. Other lengths fail. */
2624 uschar *coded = auth_b64encode((uschar *)digest, 16);
2625 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
2626 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2627 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
2629 else if (sublen == 32)
2633 for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2635 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
2636 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2637 tempcond = (strcmpic(coded, sub[1]+5) == 0);
2641 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
2642 "fail\n crypted=%s\n", sub[1]+5);
2647 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
2649 int sublen = Ustrlen(sub[1]+6);
2654 sha1_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
2656 /* If the length that we are comparing against is 28, assume the SHA1
2657 digest is expressed as a base64 string. If the length is 40, assume a
2658 straightforward hex representation. Other lengths fail. */
2662 uschar *coded = auth_b64encode((uschar *)digest, 20);
2663 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
2664 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2665 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
2667 else if (sublen == 40)
2671 for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2673 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
2674 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2675 tempcond = (strcmpic(coded, sub[1]+6) == 0);
2679 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
2680 "fail\n crypted=%s\n", sub[1]+6);
2685 else /* {crypt} or {crypt16} and non-{ at start */
2686 /* }-for-text-editors */
2691 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2696 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2701 else if (sub[1][0] == '{') /* }-for-text-editors */
2703 expand_string_message = string_sprintf("unknown encryption mechanism "
2704 "in \"%s\"", sub[1]);
2710 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2711 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2712 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2716 #define XSTR(s) STR(s)
2717 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2718 " subject=%s\n crypted=%s\n",
2719 (which == 0)? XSTR(DEFAULT_CRYPT) : (which == 1)? "crypt" : "crypt16",
2724 /* If the encrypted string contains fewer than two characters (for the
2725 salt), force failure. Otherwise we get false positives: with an empty
2726 string the yield of crypt() is an empty string! */
2728 tempcond = (Ustrlen(sub[1]) < 2)? FALSE :
2729 (Ustrcmp(coded, sub[1]) == 0);
2732 #endif /* SUPPORT_CRYPTEQ */
2738 uschar *save_iterate_item = iterate_item;
2739 int (*compare)(const uschar *, const uschar *);
2742 if (cond_type == ECOND_INLISTI)
2745 compare = (int (*)(const uschar *, const uschar *)) strcmp;
2747 while ((iterate_item = string_nextinlist(&sub[1], &sep, NULL, 0)) != NULL)
2748 if (compare(sub[0], iterate_item) == 0)
2753 iterate_item = save_iterate_item;
2756 } /* Switch for comparison conditions */
2758 *yield = tempcond == testfor;
2759 return s; /* End of comparison conditions */
2762 /* and/or: computes logical and/or of several conditions */
2766 subcondptr = (yield == NULL)? NULL : &tempcond;
2767 combined_cond = (cond_type == ECOND_AND);
2769 while (isspace(*s)) s++;
2770 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2774 while (isspace(*s)) s++;
2775 /* {-for-text-editors */
2776 if (*s == '}') break;
2777 if (*s != '{') /* }-for-text-editors */
2779 expand_string_message = string_sprintf("each subcondition "
2780 "inside an \"%s{...}\" condition must be in its own {}", name);
2784 if (!(s = eval_condition(s+1, resetok, subcondptr)))
2786 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
2787 expand_string_message, name);
2790 while (isspace(*s)) s++;
2792 /* {-for-text-editors */
2795 /* {-for-text-editors */
2796 expand_string_message = string_sprintf("missing } at end of condition "
2797 "inside \"%s\" group", name);
2803 if (cond_type == ECOND_AND)
2805 combined_cond &= tempcond;
2806 if (!combined_cond) subcondptr = NULL; /* once false, don't */
2807 } /* evaluate any more */
2810 combined_cond |= tempcond;
2811 if (combined_cond) subcondptr = NULL; /* once true, don't */
2812 } /* evaluate any more */
2816 if (yield != NULL) *yield = (combined_cond == testfor);
2820 /* forall/forany: iterates a condition with different values */
2826 uschar *save_iterate_item = iterate_item;
2828 while (isspace(*s)) s++;
2829 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2830 sub[0] = expand_string_internal(s, TRUE, &s, (yield == NULL), TRUE, resetok);
2831 if (sub[0] == NULL) return NULL;
2832 /* {-for-text-editors */
2833 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2835 while (isspace(*s)) s++;
2836 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2840 /* Call eval_condition once, with result discarded (as if scanning a
2841 "false" part). This allows us to find the end of the condition, because if
2842 the list it empty, we won't actually evaluate the condition for real. */
2844 if (!(s = eval_condition(sub[1], resetok, NULL)))
2846 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2847 expand_string_message, name);
2850 while (isspace(*s)) s++;
2852 /* {-for-text-editors */
2855 /* {-for-text-editors */
2856 expand_string_message = string_sprintf("missing } at end of condition "
2857 "inside \"%s\"", name);
2861 if (yield != NULL) *yield = !testfor;
2862 while ((iterate_item = string_nextinlist(&sub[0], &sep, NULL, 0)) != NULL)
2864 DEBUG(D_expand) debug_printf("%s: $item = \"%s\"\n", name, iterate_item);
2865 if (!eval_condition(sub[1], resetok, &tempcond))
2867 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2868 expand_string_message, name);
2869 iterate_item = save_iterate_item;
2872 DEBUG(D_expand) debug_printf("%s: condition evaluated to %s\n", name,
2873 tempcond? "true":"false");
2875 if (yield != NULL) *yield = (tempcond == testfor);
2876 if (tempcond == (cond_type == ECOND_FORANY)) break;
2879 iterate_item = save_iterate_item;
2884 /* The bool{} expansion condition maps a string to boolean.
2885 The values supported should match those supported by the ACL condition
2886 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
2887 of true/false. Note that Router "condition" rules have a different
2888 interpretation, where general data can be used and only a few values
2890 Note that readconf.c boolean matching, for boolean configuration options,
2891 only matches true/yes/false/no.
2892 The bool_lax{} condition matches the Router logic, which is much more
2895 case ECOND_BOOL_LAX:
2901 BOOL boolvalue = FALSE;
2902 while (isspace(*s)) s++;
2903 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2904 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
2905 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
2907 case 1: expand_string_message = string_sprintf(
2908 "too few arguments or bracketing error for %s",
2912 case 3: return NULL;
2915 while (isspace(*t)) t++;
2919 /* trailing whitespace: seems like a good idea to ignore it too */
2921 while (isspace(*t2)) t2--;
2922 if (t2 != (t + len))
2929 debug_printf("considering %s: %s\n", ourname, len ? t : US"<empty>");
2930 /* logic for the lax case from expand_check_condition(), which also does
2931 expands, and the logic is both short and stable enough that there should
2932 be no maintenance burden from replicating it. */
2936 ? Ustrspn(t+1, "0123456789") == len-1
2937 : Ustrspn(t, "0123456789") == len)
2939 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
2940 /* expand_check_condition only does a literal string "0" check */
2941 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
2944 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
2946 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
2948 else if (cond_type == ECOND_BOOL_LAX)
2952 expand_string_message = string_sprintf("unrecognised boolean "
2956 if (yield != NULL) *yield = (boolvalue == testfor);
2960 /* Unknown condition */
2963 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
2965 } /* End switch on condition type */
2967 /* Missing braces at start and end of data */
2969 COND_FAILED_CURLY_START:
2970 expand_string_message = string_sprintf("missing { after \"%s\"", name);
2973 COND_FAILED_CURLY_END:
2974 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
2978 /* A condition requires code that is not compiled */
2980 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
2981 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
2982 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
2983 COND_FAILED_NOT_COMPILED:
2984 expand_string_message = string_sprintf("support for \"%s\" not compiled",
2993 /*************************************************
2994 * Save numerical variables *
2995 *************************************************/
2997 /* This function is called from items such as "if" that want to preserve and
2998 restore the numbered variables.
3001 save_expand_string points to an array of pointers to set
3002 save_expand_nlength points to an array of ints for the lengths
3004 Returns: the value of expand max to save
3008 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3011 for (i = 0; i <= expand_nmax; i++)
3013 save_expand_nstring[i] = expand_nstring[i];
3014 save_expand_nlength[i] = expand_nlength[i];
3021 /*************************************************
3022 * Restore numerical variables *
3023 *************************************************/
3025 /* This function restored saved values of numerical strings.
3028 save_expand_nmax the number of strings to restore
3029 save_expand_string points to an array of pointers
3030 save_expand_nlength points to an array of ints
3036 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3037 int *save_expand_nlength)
3040 expand_nmax = save_expand_nmax;
3041 for (i = 0; i <= expand_nmax; i++)
3043 expand_nstring[i] = save_expand_nstring[i];
3044 expand_nlength[i] = save_expand_nlength[i];
3052 /*************************************************
3053 * Handle yes/no substrings *
3054 *************************************************/
3056 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3057 alternative substrings that depend on whether or not the condition was true,
3058 or the lookup or extraction succeeded. The substrings always have to be
3059 expanded, to check their syntax, but "skipping" is set when the result is not
3060 needed - this avoids unnecessary nested lookups.
3063 skipping TRUE if we were skipping when this item was reached
3064 yes TRUE if the first string is to be used, else use the second
3065 save_lookup a value to put back into lookup_value before the 2nd expansion
3066 sptr points to the input string pointer
3067 yieldptr points to the output string pointer
3068 sizeptr points to the output string size
3069 ptrptr points to the output string pointer
3070 type "lookup" or "if" or "extract" or "run", for error message
3071 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3074 Returns: 0 OK; lookup_value has been reset to save_lookup
3076 2 expansion failed because of bracketing error
3080 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, uschar **sptr,
3081 uschar **yieldptr, int *sizeptr, int *ptrptr, uschar *type, BOOL *resetok)
3084 uschar *s = *sptr; /* Local value */
3085 uschar *sub1, *sub2;
3087 /* If there are no following strings, we substitute the contents of $value for
3088 lookups and for extractions in the success case. For the ${if item, the string
3089 "true" is substituted. In the fail case, nothing is substituted for all three
3092 while (isspace(*s)) s++;
3097 if (yes) *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, US"true", 4);
3101 if (yes && lookup_value != NULL)
3102 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, lookup_value,
3103 Ustrlen(lookup_value));
3104 lookup_value = save_lookup;
3110 /* The first following string must be braced. */
3112 if (*s++ != '{') goto FAILED_CURLY;
3114 /* Expand the first substring. Forced failures are noticed only if we actually
3115 want this string. Set skipping in the call in the fail case (this will always
3116 be the case if we were already skipping). */
3118 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3119 if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED;
3120 expand_string_forcedfail = FALSE;
3121 if (*s++ != '}') goto FAILED_CURLY;
3123 /* If we want the first string, add it to the output */
3126 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub1, Ustrlen(sub1));
3128 /* If this is called from a lookup or an extract, we want to restore $value to
3129 what it was at the start of the item, so that it has this value during the
3130 second string expansion. For the call from "if" or "run" to this function,
3131 save_lookup is set to lookup_value, so that this statement does nothing. */
3133 lookup_value = save_lookup;
3135 /* There now follows either another substring, or "fail", or nothing. This
3136 time, forced failures are noticed only if we want the second string. We must
3137 set skipping in the nested call if we don't want this string, or if we were
3138 already skipping. */
3140 while (isspace(*s)) s++;
3143 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3144 if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED;
3145 expand_string_forcedfail = FALSE;
3146 if (*s++ != '}') goto FAILED_CURLY;
3148 /* If we want the second string, add it to the output */
3151 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub2, Ustrlen(sub2));
3154 /* If there is no second string, but the word "fail" is present when the use of
3155 the second string is wanted, set a flag indicating it was a forced failure
3156 rather than a syntactic error. Swallow the terminating } in case this is nested
3157 inside another lookup or if or extract. */
3162 s = read_name(name, sizeof(name), s, US"_");
3163 if (Ustrcmp(name, "fail") == 0)
3165 if (!yes && !skipping)
3167 while (isspace(*s)) s++;
3168 if (*s++ != '}') goto FAILED_CURLY;
3169 expand_string_message =
3170 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3171 expand_string_forcedfail = TRUE;
3177 expand_string_message =
3178 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3183 /* All we have to do now is to check on the final closing brace. */
3185 while (isspace(*s)) s++;
3186 if (*s++ == '}') goto RETURN;
3188 /* Get here if there is a bracketing failure */
3193 /* Get here for other failures */
3198 /* Update the input pointer value before returning */
3208 /*************************************************
3209 * Handle MD5 or SHA-1 computation for HMAC *
3210 *************************************************/
3212 /* These are some wrapping functions that enable the HMAC code to be a bit
3213 cleaner. A good compiler will spot the tail recursion.
3216 type HMAC_MD5 or HMAC_SHA1
3217 remaining are as for the cryptographic hash functions
3223 chash_start(int type, void *base)
3225 if (type == HMAC_MD5)
3226 md5_start((md5 *)base);
3228 sha1_start((sha1 *)base);
3232 chash_mid(int type, void *base, uschar *string)
3234 if (type == HMAC_MD5)
3235 md5_mid((md5 *)base, string);
3237 sha1_mid((sha1 *)base, string);
3241 chash_end(int type, void *base, uschar *string, int length, uschar *digest)
3243 if (type == HMAC_MD5)
3244 md5_end((md5 *)base, string, length, digest);
3246 sha1_end((sha1 *)base, string, length, digest);
3253 /********************************************************
3254 * prvs: Get last three digits of days since Jan 1, 1970 *
3255 ********************************************************/
3257 /* This is needed to implement the "prvs" BATV reverse
3260 Argument: integer "days" offset to add or substract to
3261 or from the current number of days.
3263 Returns: pointer to string containing the last three
3264 digits of the number of days since Jan 1, 1970,
3265 modified by the offset argument, NULL if there
3266 was an error in the conversion.
3271 prvs_daystamp(int day_offset)
3273 uschar *days = store_get(32); /* Need at least 24 for cases */
3274 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3275 (time(NULL) + day_offset*86400)/86400);
3276 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3281 /********************************************************
3282 * prvs: perform HMAC-SHA1 computation of prvs bits *
3283 ********************************************************/
3285 /* This is needed to implement the "prvs" BATV reverse
3289 address RFC2821 Address to use
3290 key The key to use (must be less than 64 characters
3292 key_num Single-digit key number to use. Defaults to
3295 Returns: pointer to string containing the first three
3296 bytes of the final hash in hex format, NULL if
3297 there was an error in the process.
3301 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3303 uschar *hash_source, *p;
3304 int size = 0,offset = 0,i;
3306 void *use_base = &sha1_base;
3307 uschar innerhash[20];
3308 uschar finalhash[20];
3309 uschar innerkey[64];
3310 uschar outerkey[64];
3311 uschar *finalhash_hex = store_get(40);
3313 if (key_num == NULL)
3316 if (Ustrlen(key) > 64)
3319 hash_source = string_cat(NULL,&size,&offset,key_num,1);
3320 string_cat(hash_source,&size,&offset,daystamp,3);
3321 string_cat(hash_source,&size,&offset,address,Ustrlen(address));
3322 hash_source[offset] = '\0';
3324 DEBUG(D_expand) debug_printf("prvs: hash source is '%s'\n", hash_source);
3326 memset(innerkey, 0x36, 64);
3327 memset(outerkey, 0x5c, 64);
3329 for (i = 0; i < Ustrlen(key); i++)
3331 innerkey[i] ^= key[i];
3332 outerkey[i] ^= key[i];
3335 chash_start(HMAC_SHA1, use_base);
3336 chash_mid(HMAC_SHA1, use_base, innerkey);
3337 chash_end(HMAC_SHA1, use_base, hash_source, offset, innerhash);
3339 chash_start(HMAC_SHA1, use_base);
3340 chash_mid(HMAC_SHA1, use_base, outerkey);
3341 chash_end(HMAC_SHA1, use_base, innerhash, 20, finalhash);
3344 for (i = 0; i < 3; i++)
3346 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3347 *p++ = hex_digits[finalhash[i] & 0x0f];
3351 return finalhash_hex;
3357 /*************************************************
3358 * Join a file onto the output string *
3359 *************************************************/
3361 /* This is used for readfile and after a run expansion. It joins the contents
3362 of a file onto the output string, globally replacing newlines with a given
3363 string (optionally). The file is closed at the end.
3367 yield pointer to the expandable string
3368 sizep pointer to the current size
3369 ptrp pointer to the current position
3370 eol newline replacement string, or NULL
3372 Returns: new value of string pointer
3376 cat_file(FILE *f, uschar *yield, int *sizep, int *ptrp, uschar *eol)
3379 uschar buffer[1024];
3381 eollen = (eol == NULL)? 0 : Ustrlen(eol);
3383 while (Ufgets(buffer, sizeof(buffer), f) != NULL)
3385 int len = Ustrlen(buffer);
3386 if (eol != NULL && buffer[len-1] == '\n') len--;
3387 yield = string_cat(yield, sizep, ptrp, buffer, len);
3388 if (buffer[len] != 0)
3389 yield = string_cat(yield, sizep, ptrp, eol, eollen);
3392 if (yield != NULL) yield[*ptrp] = 0;
3400 /*************************************************
3401 * Evaluate numeric expression *
3402 *************************************************/
3404 /* This is a set of mutually recursive functions that evaluate an arithmetic
3405 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3406 these functions that is called from elsewhere is eval_expr, whose interface is:
3409 sptr pointer to the pointer to the string - gets updated
3410 decimal TRUE if numbers are to be assumed decimal
3411 error pointer to where to put an error message - must be NULL on input
3412 endket TRUE if ')' must terminate - FALSE for external call
3414 Returns: on success: the value of the expression, with *error still NULL
3415 on failure: an undefined value, with *error = a message
3418 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3421 static int_eximarith_t
3422 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3425 int_eximarith_t x = eval_op_or(&s, decimal, error);
3431 *error = US"expecting closing parenthesis";
3433 while (isspace(*(++s)));
3435 else if (*s != 0) *error = US"expecting operator";
3442 static int_eximarith_t
3443 eval_number(uschar **sptr, BOOL decimal, uschar **error)
3448 while (isspace(*s)) s++;
3453 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
3455 switch (tolower(*s))
3458 case 'k': n *= 1024; s++; break;
3459 case 'm': n *= 1024*1024; s++; break;
3460 case 'g': n *= 1024*1024*1024; s++; break;
3462 while (isspace (*s)) s++;
3467 n = eval_expr(&s, decimal, error, 1);
3471 *error = US"expecting number or opening parenthesis";
3479 static int_eximarith_t
3480 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
3484 while (isspace(*s)) s++;
3485 if (*s == '+' || *s == '-' || *s == '~')
3488 x = eval_op_unary(&s, decimal, error);
3489 if (op == '-') x = -x;
3490 else if (op == '~') x = ~x;
3494 x = eval_number(&s, decimal, error);
3501 static int_eximarith_t
3502 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
3505 int_eximarith_t x = eval_op_unary(&s, decimal, error);
3508 while (*s == '*' || *s == '/' || *s == '%')
3511 int_eximarith_t y = eval_op_unary(&s, decimal, error);
3512 if (*error != NULL) break;
3513 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
3514 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
3515 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
3516 * -N*M is INT_MIN will yielf INT_MIN.
3517 * Since we don't support floating point, this is somewhat simpler.
3518 * Ideally, we'd return an error, but since we overflow for all other
3519 * arithmetic, consistency suggests otherwise, but what's the correct value
3520 * to use? There is none.
3521 * The C standard guarantees overflow for unsigned arithmetic but signed
3522 * overflow invokes undefined behaviour; in practice, this is overflow
3523 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
3524 * that long/longlong larger than int are available, or we could just work
3525 * with larger types. We should consider whether to guarantee 32bit eval
3526 * and 64-bit working variables, with errors returned. For now ...
3527 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
3528 * can just let the other invalid results occur otherwise, as they have
3529 * until now. For this one case, we can coerce.
3531 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
3534 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
3535 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
3545 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
3561 static int_eximarith_t
3562 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
3565 int_eximarith_t x = eval_op_mult(&s, decimal, error);
3568 while (*s == '+' || *s == '-')
3571 int_eximarith_t y = eval_op_mult(&s, decimal, error);
3572 if (*error != NULL) break;
3573 if (op == '+') x += y; else x -= y;
3581 static int_eximarith_t
3582 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
3585 int_eximarith_t x = eval_op_sum(&s, decimal, error);
3588 while ((*s == '<' || *s == '>') && s[1] == s[0])
3593 y = eval_op_sum(&s, decimal, error);
3594 if (*error != NULL) break;
3595 if (op == '<') x <<= y; else x >>= y;
3603 static int_eximarith_t
3604 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
3607 int_eximarith_t x = eval_op_shift(&s, decimal, error);
3614 y = eval_op_shift(&s, decimal, error);
3615 if (*error != NULL) break;
3624 static int_eximarith_t
3625 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
3628 int_eximarith_t x = eval_op_and(&s, decimal, error);
3635 y = eval_op_and(&s, decimal, error);
3636 if (*error != NULL) break;
3645 static int_eximarith_t
3646 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
3649 int_eximarith_t x = eval_op_xor(&s, decimal, error);
3656 y = eval_op_xor(&s, decimal, error);
3657 if (*error != NULL) break;
3667 /*************************************************
3669 *************************************************/
3671 /* Returns either an unchanged string, or the expanded string in stacking pool
3672 store. Interpreted sequences are:
3674 \... normal escaping rules
3675 $name substitutes the variable
3677 ${op:string} operates on the expanded string value
3678 ${item{arg1}{arg2}...} expands the args and then does the business
3679 some literal args are not enclosed in {}
3681 There are now far too many operators and item types to make it worth listing
3682 them here in detail any more.
3684 We use an internal routine recursively to handle embedded substrings. The
3685 external function follows. The yield is NULL if the expansion failed, and there
3686 are two cases: if something collapsed syntactically, or if "fail" was given
3687 as the action on a lookup failure. These can be distinguised by looking at the
3688 variable expand_string_forcedfail, which is TRUE in the latter case.
3690 The skipping flag is set true when expanding a substring that isn't actually
3691 going to be used (after "if" or "lookup") and it prevents lookups from
3692 happening lower down.
3694 Store usage: At start, a store block of the length of the input plus 64
3695 is obtained. This is expanded as necessary by string_cat(), which might have to
3696 get a new block, or might be able to expand the original. At the end of the
3697 function we can release any store above that portion of the yield block that
3698 was actually used. In many cases this will be optimal.
3700 However: if the first item in the expansion is a variable name or header name,
3701 we reset the store before processing it; if the result is in fresh store, we
3702 use that without copying. This is helpful for expanding strings like
3703 $message_headers which can get very long.
3705 There's a problem if a ${dlfunc item has side-effects that cause allocation,
3706 since resetting the store at the end of the expansion will free store that was
3707 allocated by the plugin code as well as the slop after the expanded string. So
3708 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
3709 and, given the acl condition, ${if }. This is an unfortunate consequence of
3710 string expansion becoming too powerful.
3713 string the string to be expanded
3714 ket_ends true if expansion is to stop at }
3715 left if not NULL, a pointer to the first character after the
3716 expansion is placed here (typically used with ket_ends)
3717 skipping TRUE for recursive calls when the value isn't actually going
3718 to be used (to allow for optimisation)
3719 honour_dollar TRUE if $ is to be expanded,
3720 FALSE if it's just another character
3721 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
3724 Returns: NULL if expansion fails:
3725 expand_string_forcedfail is set TRUE if failure was forced
3726 expand_string_message contains a textual error message
3727 a pointer to the expanded string on success
3731 expand_string_internal(uschar *string, BOOL ket_ends, uschar **left,
3732 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
3735 int size = Ustrlen(string)+ 64;
3737 uschar *yield = store_get(size);
3739 uschar *save_expand_nstring[EXPAND_MAXN+1];
3740 int save_expand_nlength[EXPAND_MAXN+1];
3741 BOOL resetok = TRUE;
3743 expand_string_forcedfail = FALSE;
3744 expand_string_message = US"";
3751 /* \ escapes the next character, which must exist, or else
3752 the expansion fails. There's a special escape, \N, which causes
3753 copying of the subject verbatim up to the next \N. Otherwise,
3754 the escapes are the standard set. */
3760 expand_string_message = US"\\ at end of string";
3767 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
3768 yield = string_cat(yield, &size, &ptr, t, s - t);
3769 if (*s != 0) s += 2;
3775 ch[0] = string_interpret_escape(&s);
3777 yield = string_cat(yield, &size, &ptr, ch, 1);
3784 /* Anything other than $ is just copied verbatim, unless we are
3785 looking for a terminating } character. */
3788 if (ket_ends && *s == '}') break;
3790 if (*s != '$' || !honour_dollar)
3792 yield = string_cat(yield, &size, &ptr, s++, 1);
3796 /* No { after the $ - must be a plain name or a number for string
3797 match variable. There has to be a fudge for variables that are the
3798 names of header fields preceded by "$header_" because header field
3799 names can contain any printing characters except space and colon.
3800 For those that don't like typing this much, "$h_" is a synonym for
3801 "$header_". A non-existent header yields a NULL value; nothing is
3804 if (isalpha((*(++s))))
3809 s = read_name(name, sizeof(name), s, US"_");
3811 /* If this is the first thing to be expanded, release the pre-allocated
3814 if (ptr == 0 && yield != NULL)
3816 if (resetok) store_reset(yield);
3823 if (Ustrncmp(name, "h_", 2) == 0 ||
3824 Ustrncmp(name, "rh_", 3) == 0 ||
3825 Ustrncmp(name, "bh_", 3) == 0 ||
3826 Ustrncmp(name, "header_", 7) == 0 ||
3827 Ustrncmp(name, "rheader_", 8) == 0 ||
3828 Ustrncmp(name, "bheader_", 8) == 0)
3830 BOOL want_raw = (name[0] == 'r')? TRUE : FALSE;
3831 uschar *charset = (name[0] == 'b')? NULL : headers_charset;
3832 s = read_header_name(name, sizeof(name), s);
3833 value = find_header(name, FALSE, &newsize, want_raw, charset);
3835 /* If we didn't find the header, and the header contains a closing brace
3836 character, this may be a user error where the terminating colon
3837 has been omitted. Set a flag to adjust the error message in this case.
3838 But there is no error here - nothing gets inserted. */
3842 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
3851 value = find_variable(name, FALSE, skipping, &newsize);
3854 expand_string_message =
3855 string_sprintf("unknown variable name \"%s\"", name);
3856 check_variable_error_message(name);
3861 /* If the data is known to be in a new buffer, newsize will be set to the
3862 size of that buffer. If this is the first thing in an expansion string,
3863 yield will be NULL; just point it at the new store instead of copying. Many
3864 expansion strings contain just one reference, so this is a useful
3865 optimization, especially for humungous headers. */
3867 len = Ustrlen(value);
3868 if (yield == NULL && newsize != 0)
3874 else yield = string_cat(yield, &size, &ptr, value, len);
3882 s = read_number(&n, s);
3883 if (n >= 0 && n <= expand_nmax)
3884 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
3889 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
3891 if (*s != '{') /*}*/
3893 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
3897 /* After { there can be various things, but they all start with
3898 an initial word, except for a number for a string match variable. */
3900 if (isdigit((*(++s))))
3903 s = read_number(&n, s); /*{*/
3906 expand_string_message = US"} expected after number";
3909 if (n >= 0 && n <= expand_nmax)
3910 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
3917 expand_string_message = US"letter or digit expected after ${"; /*}*/
3921 /* Allow "-" in names to cater for substrings with negative
3922 arguments. Since we are checking for known names after { this is
3925 s = read_name(name, sizeof(name), s, US"_-");
3926 item_type = chop_match(name, item_table, sizeof(item_table)/sizeof(uschar *));
3930 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
3931 If the ACL returns accept or reject we return content set by "message ="
3932 There is currently no limit on recursion; this would have us call
3933 acl_check_internal() directly and get a current level from somewhere.
3934 See also the acl expansion condition ECOND_ACL and the traditional
3935 acl modifier ACLC_ACL.
3936 Assume that the function has side-effects on the store that must be preserved.
3940 /* ${acl {name} {arg1}{arg2}...} */
3942 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
3945 switch(read_subs(sub, 10, 1, &s, skipping, TRUE, US"acl", &resetok))
3947 case 1: goto EXPAND_FAILED_CURLY;
3949 case 3: goto EXPAND_FAILED;
3951 if (skipping) continue;
3954 switch(eval_acl(sub, sizeof(sub)/sizeof(*sub), &user_msg))
3959 debug_printf("acl expansion yield: %s\n", user_msg);
3961 yield = string_cat(yield, &size, &ptr, user_msg, Ustrlen(user_msg));
3965 expand_string_forcedfail = TRUE;
3967 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
3972 /* Handle conditionals - preserve the values of the numerical expansion
3973 variables in case they get changed by a regular expression match in the
3974 condition. If not, they retain their external settings. At the end
3975 of this "if" section, they get restored to their previous values. */
3981 int save_expand_nmax =
3982 save_expand_strings(save_expand_nstring, save_expand_nlength);
3984 while (isspace(*s)) s++;
3985 next_s = eval_condition(s, &resetok, skipping? NULL : &cond);
3986 if (next_s == NULL) goto EXPAND_FAILED; /* message already set */
3989 debug_printf("condition: %.*s\n result: %s\n", (int)(next_s - s), s,
3990 cond? "true" : "false");
3994 /* The handling of "yes" and "no" result strings is now in a separate
3995 function that is also used by ${lookup} and ${extract} and ${run}. */
3997 switch(process_yesno(
3998 skipping, /* were previously skipping */
3999 cond, /* success/failure indicator */
4000 lookup_value, /* value to reset for string2 */
4001 &s, /* input pointer */
4002 &yield, /* output pointer */
4003 &size, /* output size */
4004 &ptr, /* output current point */
4005 US"if", /* condition type */
4008 case 1: goto EXPAND_FAILED; /* when all is well, the */
4009 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4012 /* Restore external setting of expansion variables for continuation
4015 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4016 save_expand_nlength);
4020 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4021 expanding an internal string that isn't actually going to be used. All we
4022 need to do is check the syntax, so don't do a lookup at all. Preserve the
4023 values of the numerical expansion variables in case they get changed by a
4024 partial lookup. If not, they retain their external settings. At the end
4025 of this "lookup" section, they get restored to their previous values. */
4029 int stype, partial, affixlen, starflags;
4030 int expand_setup = 0;
4032 uschar *key, *filename, *affix;
4033 uschar *save_lookup_value = lookup_value;
4034 int save_expand_nmax =
4035 save_expand_strings(save_expand_nstring, save_expand_nlength);
4037 if ((expand_forbid & RDO_LOOKUP) != 0)
4039 expand_string_message = US"lookup expansions are not permitted";
4043 /* Get the key we are to look up for single-key+file style lookups.
4044 Otherwise set the key NULL pro-tem. */
4046 while (isspace(*s)) s++;
4047 if (*s == '{') /*}*/
4049 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4050 if (key == NULL) goto EXPAND_FAILED; /*{*/
4051 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4052 while (isspace(*s)) s++;
4056 /* Find out the type of database */
4060 expand_string_message = US"missing lookup type";
4064 /* The type is a string that may contain special characters of various
4065 kinds. Allow everything except space or { to appear; the actual content
4066 is checked by search_findtype_partial. */ /*}*/
4068 while (*s != 0 && *s != '{' && !isspace(*s)) /*}*/
4070 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4074 while (isspace(*s)) s++;
4076 /* Now check for the individual search type and any partial or default
4077 options. Only those types that are actually in the binary are valid. */
4079 stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4083 expand_string_message = search_error_message;
4087 /* Check that a key was provided for those lookup types that need it,
4088 and was not supplied for those that use the query style. */
4090 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4094 expand_string_message = string_sprintf("missing {key} for single-"
4095 "key \"%s\" lookup", name);
4103 expand_string_message = string_sprintf("a single key was given for "
4104 "lookup type \"%s\", which is not a single-key lookup type", name);
4109 /* Get the next string in brackets and expand it. It is the file name for
4110 single-key+file lookups, and the whole query otherwise. In the case of
4111 queries that also require a file name (e.g. sqlite), the file name comes
4114 if (*s != '{') goto EXPAND_FAILED_CURLY;
4115 filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4116 if (filename == NULL) goto EXPAND_FAILED;
4117 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4118 while (isspace(*s)) s++;
4120 /* If this isn't a single-key+file lookup, re-arrange the variables
4121 to be appropriate for the search_ functions. For query-style lookups,
4122 there is just a "key", and no file name. For the special query-style +
4123 file types, the query (i.e. "key") starts with a file name. */
4127 while (isspace(*filename)) filename++;
4130 if (mac_islookup(stype, lookup_querystyle))
4136 if (*filename != '/')
4138 expand_string_message = string_sprintf(
4139 "absolute file name expected for \"%s\" lookup", name);
4142 while (*key != 0 && !isspace(*key)) key++;
4143 if (*key != 0) *key++ = 0;
4147 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4148 the entry was not found. Note that there is no search_close() function.
4149 Files are left open in case of re-use. At suitable places in higher logic,
4150 search_tidyup() is called to tidy all open files. This can save opening
4151 the same file several times. However, files may also get closed when
4152 others are opened, if too many are open at once. The rule is that a
4153 handle should not be used after a second search_open().
4155 Request that a partial search sets up $1 and maybe $2 by passing
4156 expand_setup containing zero. If its value changes, reset expand_nmax,
4157 since new variables will have been set. Note that at the end of this
4158 "lookup" section, the old numeric variables are restored. */
4161 lookup_value = NULL;
4164 void *handle = search_open(filename, stype, 0, NULL, NULL);
4167 expand_string_message = search_error_message;
4170 lookup_value = search_find(handle, filename, key, partial, affix,
4171 affixlen, starflags, &expand_setup);
4172 if (search_find_defer)
4174 expand_string_message =
4175 string_sprintf("lookup of \"%s\" gave DEFER: %s",
4176 string_printing2(key, FALSE), search_error_message);
4179 if (expand_setup > 0) expand_nmax = expand_setup;
4182 /* The handling of "yes" and "no" result strings is now in a separate
4183 function that is also used by ${if} and ${extract}. */
4185 switch(process_yesno(
4186 skipping, /* were previously skipping */
4187 lookup_value != NULL, /* success/failure indicator */
4188 save_lookup_value, /* value to reset for string2 */
4189 &s, /* input pointer */
4190 &yield, /* output pointer */
4191 &size, /* output size */
4192 &ptr, /* output current point */
4193 US"lookup", /* condition type */
4196 case 1: goto EXPAND_FAILED; /* when all is well, the */
4197 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4200 /* Restore external setting of expansion variables for carrying on
4201 at this level, and continue. */
4203 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4204 save_expand_nlength);
4208 /* If Perl support is configured, handle calling embedded perl subroutines,
4209 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
4210 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
4211 arguments (defined below). */
4213 #define EXIM_PERL_MAX_ARGS 8
4217 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
4218 "is not included in this binary";
4221 #else /* EXIM_PERL */
4223 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
4226 if ((expand_forbid & RDO_PERL) != 0)
4228 expand_string_message = US"Perl calls are not permitted";
4232 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
4233 US"perl", &resetok))
4235 case 1: goto EXPAND_FAILED_CURLY;
4237 case 3: goto EXPAND_FAILED;
4240 /* If skipping, we don't actually do anything */
4242 if (skipping) continue;
4244 /* Start the interpreter if necessary */
4246 if (!opt_perl_started)
4249 if (opt_perl_startup == NULL)
4251 expand_string_message = US"A setting of perl_startup is needed when "
4252 "using the Perl interpreter";
4255 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4256 initerror = init_perl(opt_perl_startup);
4257 if (initerror != NULL)
4259 expand_string_message =
4260 string_sprintf("error in perl_startup code: %s\n", initerror);
4263 opt_perl_started = TRUE;
4266 /* Call the function */
4268 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
4269 new_yield = call_perl_cat(yield, &size, &ptr, &expand_string_message,
4270 sub_arg[0], sub_arg + 1);
4272 /* NULL yield indicates failure; if the message pointer has been set to
4273 NULL, the yield was undef, indicating a forced failure. Otherwise the
4274 message will indicate some kind of Perl error. */
4276 if (new_yield == NULL)
4278 if (expand_string_message == NULL)
4280 expand_string_message =
4281 string_sprintf("Perl subroutine \"%s\" returned undef to force "
4282 "failure", sub_arg[0]);
4283 expand_string_forcedfail = TRUE;
4288 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
4289 set during a callback from Perl. */
4291 expand_string_forcedfail = FALSE;
4295 #endif /* EXIM_PERL */
4297 /* Transform email address to "prvs" scheme to use
4298 as BATV-signed return path */
4305 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, US"prvs", &resetok))
4307 case 1: goto EXPAND_FAILED_CURLY;
4309 case 3: goto EXPAND_FAILED;
4312 /* If skipping, we don't actually do anything */
4313 if (skipping) continue;
4315 /* sub_arg[0] is the address */
4316 domain = Ustrrchr(sub_arg[0],'@');
4317 if ( (domain == NULL) || (domain == sub_arg[0]) || (Ustrlen(domain) == 1) )
4319 expand_string_message = US"prvs first argument must be a qualified email address";
4323 /* Calculate the hash. The second argument must be a single-digit
4324 key number, or unset. */
4326 if (sub_arg[2] != NULL &&
4327 (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
4329 expand_string_message = US"prvs second argument must be a single digit";
4333 p = prvs_hmac_sha1(sub_arg[0],sub_arg[1],sub_arg[2],prvs_daystamp(7));
4336 expand_string_message = US"prvs hmac-sha1 conversion failed";
4340 /* Now separate the domain from the local part */
4343 yield = string_cat(yield,&size,&ptr,US"prvs=",5);
4344 string_cat(yield,&size,&ptr,(sub_arg[2] != NULL) ? sub_arg[2] : US"0", 1);
4345 string_cat(yield,&size,&ptr,prvs_daystamp(7),3);
4346 string_cat(yield,&size,&ptr,p,6);
4347 string_cat(yield,&size,&ptr,US"=",1);
4348 string_cat(yield,&size,&ptr,sub_arg[0],Ustrlen(sub_arg[0]));
4349 string_cat(yield,&size,&ptr,US"@",1);
4350 string_cat(yield,&size,&ptr,domain,Ustrlen(domain));
4355 /* Check a prvs-encoded address for validity */
4357 case EITEM_PRVSCHECK:
4360 int mysize = 0, myptr = 0;
4364 /* TF: Ugliness: We want to expand parameter 1 first, then set
4365 up expansion variables that are used in the expansion of
4366 parameter 2. So we clone the string for the first
4367 expansion, where we only expand parameter 1.
4369 PH: Actually, that isn't necessary. The read_subs() function is
4370 designed to work this way for the ${if and ${lookup expansions. I've
4374 /* Reset expansion variables */
4375 prvscheck_result = NULL;
4376 prvscheck_address = NULL;
4377 prvscheck_keynum = NULL;
4379 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok))
4381 case 1: goto EXPAND_FAILED_CURLY;
4383 case 3: goto EXPAND_FAILED;
4386 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
4389 if (regex_match_and_setup(re,sub_arg[0],0,-1))
4391 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
4392 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
4393 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
4394 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
4395 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
4397 DEBUG(D_expand) debug_printf("prvscheck localpart: %s\n", local_part);
4398 DEBUG(D_expand) debug_printf("prvscheck key number: %s\n", key_num);
4399 DEBUG(D_expand) debug_printf("prvscheck daystamp: %s\n", daystamp);
4400 DEBUG(D_expand) debug_printf("prvscheck hash: %s\n", hash);
4401 DEBUG(D_expand) debug_printf("prvscheck domain: %s\n", domain);
4403 /* Set up expansion variables */
4404 prvscheck_address = string_cat(NULL, &mysize, &myptr, local_part, Ustrlen(local_part));
4405 string_cat(prvscheck_address,&mysize,&myptr,US"@",1);
4406 string_cat(prvscheck_address,&mysize,&myptr,domain,Ustrlen(domain));
4407 prvscheck_address[myptr] = '\0';
4408 prvscheck_keynum = string_copy(key_num);
4410 /* Now expand the second argument */
4411 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok))
4413 case 1: goto EXPAND_FAILED_CURLY;
4415 case 3: goto EXPAND_FAILED;
4418 /* Now we have the key and can check the address. */
4420 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
4425 expand_string_message = US"hmac-sha1 conversion failed";
4429 DEBUG(D_expand) debug_printf("prvscheck: received hash is %s\n", hash);
4430 DEBUG(D_expand) debug_printf("prvscheck: own hash is %s\n", p);
4432 if (Ustrcmp(p,hash) == 0)
4434 /* Success, valid BATV address. Now check the expiry date. */
4435 uschar *now = prvs_daystamp(0);
4436 unsigned int inow = 0,iexpire = 1;
4438 (void)sscanf(CS now,"%u",&inow);
4439 (void)sscanf(CS daystamp,"%u",&iexpire);
4441 /* When "iexpire" is < 7, a "flip" has occured.
4442 Adjust "inow" accordingly. */
4443 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
4445 if (iexpire >= inow)
4447 prvscheck_result = US"1";
4448 DEBUG(D_expand) debug_printf("prvscheck: success, $pvrs_result set to 1\n");
4452 prvscheck_result = NULL;
4453 DEBUG(D_expand) debug_printf("prvscheck: signature expired, $pvrs_result unset\n");
4458 prvscheck_result = NULL;
4459 DEBUG(D_expand) debug_printf("prvscheck: hash failure, $pvrs_result unset\n");
4462 /* Now expand the final argument. We leave this till now so that
4463 it can include $prvscheck_result. */
4465 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, US"prvs", &resetok))
4467 case 1: goto EXPAND_FAILED_CURLY;
4469 case 3: goto EXPAND_FAILED;
4472 if (sub_arg[0] == NULL || *sub_arg[0] == '\0')
4473 yield = string_cat(yield,&size,&ptr,prvscheck_address,Ustrlen(prvscheck_address));
4475 yield = string_cat(yield,&size,&ptr,sub_arg[0],Ustrlen(sub_arg[0]));
4477 /* Reset the "internal" variables afterwards, because they are in
4478 dynamic store that will be reclaimed if the expansion succeeded. */
4480 prvscheck_address = NULL;
4481 prvscheck_keynum = NULL;
4485 /* Does not look like a prvs encoded address, return the empty string.
4486 We need to make sure all subs are expanded first, so as to skip over
4489 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"prvs", &resetok))
4491 case 1: goto EXPAND_FAILED_CURLY;
4493 case 3: goto EXPAND_FAILED;
4500 /* Handle "readfile" to insert an entire file */
4502 case EITEM_READFILE:
4507 if ((expand_forbid & RDO_READFILE) != 0)
4509 expand_string_message = US"file insertions are not permitted";
4513 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile", &resetok))
4515 case 1: goto EXPAND_FAILED_CURLY;
4517 case 3: goto EXPAND_FAILED;
4520 /* If skipping, we don't actually do anything */
4522 if (skipping) continue;
4524 /* Open the file and read it */
4526 f = Ufopen(sub_arg[0], "rb");
4529 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
4533 yield = cat_file(f, yield, &size, &ptr, sub_arg[1]);
4538 /* Handle "readsocket" to insert data from a Unix domain socket */
4540 case EITEM_READSOCK:
4546 struct sockaddr_un sockun; /* don't call this "sun" ! */
4550 if ((expand_forbid & RDO_READSOCK) != 0)
4552 expand_string_message = US"socket insertions are not permitted";
4556 /* Read up to 4 arguments, but don't do the end of item check afterwards,
4557 because there may be a string for expansion on failure. */
4559 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket", &resetok))
4561 case 1: goto EXPAND_FAILED_CURLY;
4562 case 2: /* Won't occur: no end check */
4563 case 3: goto EXPAND_FAILED;
4566 /* Sort out timeout, if given */
4568 if (sub_arg[2] != NULL)
4570 timeout = readconf_readtime(sub_arg[2], 0, FALSE);
4573 expand_string_message = string_sprintf("bad time value %s",
4578 else sub_arg[3] = NULL; /* No eol if no timeout */
4580 /* If skipping, we don't actually do anything. Otherwise, arrange to
4581 connect to either an IP or a Unix socket. */
4585 /* Handle an IP (internet) domain */
4587 if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
4590 uschar *server_name = sub_arg[0] + 5;
4591 uschar *port_name = Ustrrchr(server_name, ':');
4593 /* Sort out the port */
4595 if (port_name == NULL)
4597 expand_string_message =
4598 string_sprintf("missing port for readsocket %s", sub_arg[0]);
4601 *port_name++ = 0; /* Terminate server name */
4603 if (isdigit(*port_name))
4606 port = Ustrtol(port_name, &end, 0);
4607 if (end != port_name + Ustrlen(port_name))
4609 expand_string_message =
4610 string_sprintf("invalid port number %s", port_name);
4616 struct servent *service_info = getservbyname(CS port_name, "tcp");
4617 if (service_info == NULL)
4619 expand_string_message = string_sprintf("unknown port \"%s\"",
4623 port = ntohs(service_info->s_port);
4626 if ((fd = ip_connectedsocket(SOCK_STREAM, server_name, port, port,
4627 timeout, NULL, &expand_string_message)) < 0)
4631 /* Handle a Unix domain socket */
4636 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
4638 expand_string_message = string_sprintf("failed to create socket: %s",
4643 sockun.sun_family = AF_UNIX;
4644 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
4647 sigalrm_seen = FALSE;
4649 rc = connect(fd, (struct sockaddr *)(&sockun), sizeof(sockun));
4653 expand_string_message = US "socket connect timed out";
4658 expand_string_message = string_sprintf("failed to connect to socket "
4659 "%s: %s", sub_arg[0], strerror(errno));
4664 DEBUG(D_expand) debug_printf("connected to socket %s\n", sub_arg[0]);
4666 /* Write the request string, if not empty */
4668 if (sub_arg[1][0] != 0)
4670 int len = Ustrlen(sub_arg[1]);
4671 DEBUG(D_expand) debug_printf("writing \"%s\" to socket\n",
4673 if (write(fd, sub_arg[1], len) != len)
4675 expand_string_message = string_sprintf("request write to socket "
4676 "failed: %s", strerror(errno));
4681 /* Shut down the sending side of the socket. This helps some servers to
4682 recognise that it is their turn to do some work. Just in case some
4683 system doesn't have this function, make it conditional. */
4686 shutdown(fd, SHUT_WR);
4689 /* Now we need to read from the socket, under a timeout. The function
4690 that reads a file can be used. */
4692 f = fdopen(fd, "rb");
4693 sigalrm_seen = FALSE;
4695 yield = cat_file(f, yield, &size, &ptr, sub_arg[3]);
4699 /* After a timeout, we restore the pointer in the result, that is,
4700 make sure we add nothing from the socket. */
4705 expand_string_message = US "socket read timed out";
4710 /* The whole thing has worked (or we were skipping). If there is a
4711 failure string following, we need to skip it. */
4715 if (expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok) == NULL)
4717 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4718 while (isspace(*s)) s++;
4720 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4723 /* Come here on failure to create socket, connect socket, write to the
4724 socket, or timeout on reading. If another substring follows, expand and
4725 use it. Otherwise, those conditions give expand errors. */
4728 if (*s != '{') goto EXPAND_FAILED;
4729 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
4730 arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok);
4731 if (arg == NULL) goto EXPAND_FAILED;
4732 yield = string_cat(yield, &size, &ptr, arg, Ustrlen(arg));
4733 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4734 while (isspace(*s)) s++;
4735 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4739 /* Handle "run" to execute a program. */
4751 if ((expand_forbid & RDO_RUN) != 0)
4753 expand_string_message = US"running a command is not permitted";
4757 while (isspace(*s)) s++;
4758 if (*s != '{') goto EXPAND_FAILED_CURLY;
4759 arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4760 if (arg == NULL) goto EXPAND_FAILED;
4761 while (isspace(*s)) s++;
4762 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4764 if (skipping) /* Just pretend it worked when we're skipping */
4770 if (!transport_set_up_command(&argv, /* anchor for arg list */
4771 arg, /* raw command */
4772 FALSE, /* don't expand the arguments */
4773 0, /* not relevant when... */
4774 NULL, /* no transporting address */
4775 US"${run} expansion", /* for error messages */
4776 &expand_string_message)) /* where to put error message */
4781 /* Create the child process, making it a group leader. */
4783 pid = child_open(argv, NULL, 0077, &fd_in, &fd_out, TRUE);
4787 expand_string_message =
4788 string_sprintf("couldn't create child process: %s", strerror(errno));
4792 /* Nothing is written to the standard input. */
4796 /* Read the pipe to get the command's output into $value (which is kept
4797 in lookup_value). Read during execution, so that if the output exceeds
4798 the OS pipe buffer limit, we don't block forever. */
4800 f = fdopen(fd_out, "rb");
4801 sigalrm_seen = FALSE;
4803 lookup_value = cat_file(f, lookup_value, &lsize, &lptr, NULL);
4807 /* Wait for the process to finish, applying the timeout, and inspect its
4808 return code for serious disasters. Simple non-zero returns are passed on.
4811 if (sigalrm_seen == TRUE || (runrc = child_close(pid, 30)) < 0)
4813 if (sigalrm_seen == TRUE || runrc == -256)
4815 expand_string_message = string_sprintf("command timed out");
4816 killpg(pid, SIGKILL); /* Kill the whole process group */
4819 else if (runrc == -257)
4820 expand_string_message = string_sprintf("wait() failed: %s",
4824 expand_string_message = string_sprintf("command killed by signal %d",
4831 /* Process the yes/no strings; $value may be useful in both cases */
4833 switch(process_yesno(
4834 skipping, /* were previously skipping */
4835 runrc == 0, /* success/failure indicator */
4836 lookup_value, /* value to reset for string2 */
4837 &s, /* input pointer */
4838 &yield, /* output pointer */
4839 &size, /* output size */
4840 &ptr, /* output current point */
4841 US"run", /* condition type */
4844 case 1: goto EXPAND_FAILED; /* when all is well, the */
4845 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4851 /* Handle character translation for "tr" */
4859 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr", &resetok))
4861 case 1: goto EXPAND_FAILED_CURLY;
4863 case 3: goto EXPAND_FAILED;
4866 yield = string_cat(yield, &size, &ptr, sub[0], Ustrlen(sub[0]));
4867 o2m = Ustrlen(sub[2]) - 1;
4869 if (o2m >= 0) for (; oldptr < ptr; oldptr++)
4871 uschar *m = Ustrrchr(sub[1], yield[oldptr]);
4875 yield[oldptr] = sub[2][(o < o2m)? o : o2m];
4882 /* Handle "hash", "length", "nhash", and "substr" when they are given with
4883 expanded arguments. */
4893 int val[2] = { 0, -1 };
4896 /* "length" takes only 2 arguments whereas the others take 2 or 3.
4897 Ensure that sub[2] is set in the ${length } case. */
4900 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
4901 TRUE, name, &resetok))
4903 case 1: goto EXPAND_FAILED_CURLY;
4905 case 3: goto EXPAND_FAILED;
4908 /* Juggle the arguments if there are only two of them: always move the
4909 string to the last position and make ${length{n}{str}} equivalent to
4910 ${substr{0}{n}{str}}. See the defaults for val[] above. */
4916 if (item_type == EITEM_LENGTH)
4923 for (i = 0; i < 2; i++)
4925 if (sub[i] == NULL) continue;
4926 val[i] = (int)Ustrtol(sub[i], &ret, 10);
4927 if (*ret != 0 || (i != 0 && val[i] < 0))
4929 expand_string_message = string_sprintf("\"%s\" is not a%s number "
4930 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
4936 (item_type == EITEM_HASH)?
4937 compute_hash(sub[2], val[0], val[1], &len) :
4938 (item_type == EITEM_NHASH)?
4939 compute_nhash(sub[2], val[0], val[1], &len) :
4940 extract_substr(sub[2], val[0], val[1], &len);
4942 if (ret == NULL) goto EXPAND_FAILED;
4943 yield = string_cat(yield, &size, &ptr, ret, len);
4947 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
4948 This code originally contributed by Steve Haslam. It currently supports
4949 the use of MD5 and SHA-1 hashes.
4951 We need some workspace that is large enough to handle all the supported
4952 hash types. Use macros to set the sizes rather than be too elaborate. */
4954 #define MAX_HASHLEN 20
4955 #define MAX_HASHBLOCKLEN 64
4964 int hashlen; /* Number of octets for the hash algorithm's output */
4965 int hashblocklen; /* Number of octets the hash algorithm processes */
4967 unsigned int keylen;
4969 uschar keyhash[MAX_HASHLEN];
4970 uschar innerhash[MAX_HASHLEN];
4971 uschar finalhash[MAX_HASHLEN];
4972 uschar finalhash_hex[2*MAX_HASHLEN];
4973 uschar innerkey[MAX_HASHBLOCKLEN];
4974 uschar outerkey[MAX_HASHBLOCKLEN];
4976 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
4978 case 1: goto EXPAND_FAILED_CURLY;
4980 case 3: goto EXPAND_FAILED;
4983 if (Ustrcmp(sub[0], "md5") == 0)
4986 use_base = &md5_base;
4990 else if (Ustrcmp(sub[0], "sha1") == 0)
4993 use_base = &sha1_base;
4999 expand_string_message =
5000 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5005 keylen = Ustrlen(keyptr);
5007 /* If the key is longer than the hash block length, then hash the key
5010 if (keylen > hashblocklen)
5012 chash_start(type, use_base);
5013 chash_end(type, use_base, keyptr, keylen, keyhash);
5018 /* Now make the inner and outer key values */
5020 memset(innerkey, 0x36, hashblocklen);
5021 memset(outerkey, 0x5c, hashblocklen);
5023 for (i = 0; i < keylen; i++)
5025 innerkey[i] ^= keyptr[i];
5026 outerkey[i] ^= keyptr[i];
5029 /* Now do the hashes */
5031 chash_start(type, use_base);
5032 chash_mid(type, use_base, innerkey);
5033 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5035 chash_start(type, use_base);
5036 chash_mid(type, use_base, outerkey);
5037 chash_end(type, use_base, innerhash, hashlen, finalhash);
5039 /* Encode the final hash as a hex string */
5042 for (i = 0; i < hashlen; i++)
5044 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5045 *p++ = hex_digits[finalhash[i] & 0x0f];
5048 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%.*s)=%.*s\n", sub[0],
5049 (int)keylen, keyptr, Ustrlen(sub[2]), sub[2], hashlen*2, finalhash_hex);
5051 yield = string_cat(yield, &size, &ptr, finalhash_hex, hashlen*2);
5056 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5057 We have to save the numerical variables and restore them afterwards. */
5062 int moffset, moffsetextra, slen;
5065 const uschar *rerror;
5068 int save_expand_nmax =
5069 save_expand_strings(save_expand_nstring, save_expand_nlength);
5071 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"sg", &resetok))
5073 case 1: goto EXPAND_FAILED_CURLY;
5075 case 3: goto EXPAND_FAILED;
5078 /* Compile the regular expression */
5080 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
5085 expand_string_message = string_sprintf("regular expression error in "
5086 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
5090 /* Now run a loop to do the substitutions as often as necessary. It ends
5091 when there are no more matches. Take care over matches of the null string;
5092 do the same thing as Perl does. */
5095 slen = Ustrlen(sub[0]);
5096 moffset = moffsetextra = 0;
5101 int ovector[3*(EXPAND_MAXN+1)];
5102 int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra,
5103 PCRE_EOPT | emptyopt, ovector, sizeof(ovector)/sizeof(int));
5107 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5108 is not necessarily the end. We want to repeat the match from one
5109 character further along, but leaving the basic offset the same (for
5110 copying below). We can't be at the end of the string - that was checked
5111 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5112 finished; copy the remaining string and end the loop. */
5122 yield = string_cat(yield, &size, &ptr, subject+moffset, slen-moffset);
5126 /* Match - set up for expanding the replacement. */
5128 if (n == 0) n = EXPAND_MAXN + 1;
5130 for (nn = 0; nn < n*2; nn += 2)
5132 expand_nstring[expand_nmax] = subject + ovector[nn];
5133 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
5137 /* Copy the characters before the match, plus the expanded insertion. */
5139 yield = string_cat(yield, &size, &ptr, subject + moffset,
5140 ovector[0] - moffset);
5141 insert = expand_string(sub[2]);
5142 if (insert == NULL) goto EXPAND_FAILED;
5143 yield = string_cat(yield, &size, &ptr, insert, Ustrlen(insert));
5145 moffset = ovector[1];
5149 /* If we have matched an empty string, first check to see if we are at
5150 the end of the subject. If so, the loop is over. Otherwise, mimic
5151 what Perl's /g options does. This turns out to be rather cunning. First
5152 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5153 string at the same point. If this fails (picked up above) we advance to
5154 the next character. */
5156 if (ovector[0] == ovector[1])
5158 if (ovector[0] == slen) break;
5159 emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED;
5163 /* All done - restore numerical variables. */
5165 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5166 save_expand_nlength);
5170 /* Handle keyed and numbered substring extraction. If the first argument
5171 consists entirely of digits, then a numerical extraction is assumed. */
5177 int field_number = 1;
5178 BOOL field_number_set = FALSE;
5179 uschar *save_lookup_value = lookup_value;
5181 int save_expand_nmax =
5182 save_expand_strings(save_expand_nstring, save_expand_nlength);
5184 /* Read the arguments */
5186 for (i = 0; i < j; i++)
5188 while (isspace(*s)) s++;
5189 if (*s == '{') /*}*/
5191 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5192 if (sub[i] == NULL) goto EXPAND_FAILED; /*{*/
5193 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5195 /* After removal of leading and trailing white space, the first
5196 argument must not be empty; if it consists entirely of digits
5197 (optionally preceded by a minus sign), this is a numerical
5198 extraction, and we expect 3 arguments. */
5206 while (isspace(*p)) p++;
5210 while (len > 0 && isspace(p[len-1])) len--;
5213 if (*p == 0 && !skipping)
5215 expand_string_message = US"first argument of \"extract\" must "
5225 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
5229 j = 3; /* Need 3 args */
5230 field_number_set = TRUE;
5234 else goto EXPAND_FAILED_CURLY;
5237 /* Extract either the numbered or the keyed substring into $value. If
5238 skipping, just pretend the extraction failed. */
5240 lookup_value = skipping? NULL : field_number_set?
5241 expand_gettokened(field_number, sub[1], sub[2]) :
5242 expand_getkeyed(sub[0], sub[1]);
5244 /* If no string follows, $value gets substituted; otherwise there can
5245 be yes/no strings, as for lookup or if. */
5247 switch(process_yesno(
5248 skipping, /* were previously skipping */
5249 lookup_value != NULL, /* success/failure indicator */
5250 save_lookup_value, /* value to reset for string2 */
5251 &s, /* input pointer */
5252 &yield, /* output pointer */
5253 &size, /* output size */
5254 &ptr, /* output current point */
5255 US"extract", /* condition type */
5258 case 1: goto EXPAND_FAILED; /* when all is well, the */
5259 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5262 /* All done - restore numerical variables. */
5264 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5265 save_expand_nlength);
5270 /* return the Nth item from a list */
5272 case EITEM_LISTEXTRACT:
5275 int field_number = 1;
5276 uschar *save_lookup_value = lookup_value;
5278 int save_expand_nmax =
5279 save_expand_strings(save_expand_nstring, save_expand_nlength);
5281 /* Read the field & list arguments */
5283 for (i = 0; i < 2; i++)
5285 while (isspace(*s)) s++;
5286 if (*s != '{') /*}*/
5287 goto EXPAND_FAILED_CURLY;
5289 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5290 if (!sub[i]) goto EXPAND_FAILED; /*{*/
5291 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5293 /* After removal of leading and trailing white space, the first
5294 argument must be numeric and nonempty. */
5302 while (isspace(*p)) p++;
5306 while (len > 0 && isspace(p[len-1])) len--;
5309 if (!*p && !skipping)
5311 expand_string_message = US"first argument of \"listextract\" must "
5321 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
5324 expand_string_message = US"first argument of \"listextract\" must "
5332 /* Extract the numbered element into $value. If
5333 skipping, just pretend the extraction failed. */
5335 lookup_value = skipping? NULL : expand_getlistele(field_number, sub[1]);
5337 /* If no string follows, $value gets substituted; otherwise there can
5338 be yes/no strings, as for lookup or if. */
5340 switch(process_yesno(
5341 skipping, /* were previously skipping */
5342 lookup_value != NULL, /* success/failure indicator */
5343 save_lookup_value, /* value to reset for string2 */
5344 &s, /* input pointer */
5345 &yield, /* output pointer */
5346 &size, /* output size */
5347 &ptr, /* output current point */
5348 US"extract", /* condition type */
5351 case 1: goto EXPAND_FAILED; /* when all is well, the */
5352 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5355 /* All done - restore numerical variables. */
5357 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5358 save_expand_nlength);
5364 case EITEM_CERTEXTRACT:
5367 int field_number = 1;
5368 uschar *save_lookup_value = lookup_value;
5370 int save_expand_nmax =
5371 save_expand_strings(save_expand_nstring, save_expand_nlength);
5373 /* Read the field argument */
5374 while (isspace(*s)) s++;
5375 if (*s != '{') /*}*/
5376 goto EXPAND_FAILED_CURLY;
5377 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5378 if (!sub[0]) goto EXPAND_FAILED; /*{*/
5379 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5380 /* strip spaces fore & aft */
5386 while (isspace(*p)) p++;
5390 while (len > 0 && isspace(p[len-1])) len--;
5394 /* inspect the cert argument */
5395 while (isspace(*s)) s++;
5396 if (*s != '{') /*}*/
5397 goto EXPAND_FAILED_CURLY;
5400 expand_string_message = US"second argument of \"certextract\" must "
5401 "be a certificate variable";
5404 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
5405 if (!sub[1]) goto EXPAND_FAILED; /*{*/
5406 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5409 lookup_value = NULL;
5412 lookup_value = expand_getcertele(sub[0], sub[1]);
5413 if (*expand_string_message) goto EXPAND_FAILED;
5415 switch(process_yesno(
5416 skipping, /* were previously skipping */
5417 lookup_value != NULL, /* success/failure indicator */
5418 save_lookup_value, /* value to reset for string2 */
5419 &s, /* input pointer */
5420 &yield, /* output pointer */
5421 &size, /* output size */
5422 &ptr, /* output current point */
5423 US"extract", /* condition type */
5426 case 1: goto EXPAND_FAILED; /* when all is well, the */
5427 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5430 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5431 save_expand_nlength);
5434 #endif /*SUPPORT_TLS*/
5436 /* Handle list operations */
5444 uschar outsep[2] = { '\0', '\0' };
5445 uschar *list, *expr, *temp;
5446 uschar *save_iterate_item = iterate_item;
5447 uschar *save_lookup_value = lookup_value;
5449 while (isspace(*s)) s++;
5450 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5452 list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
5453 if (list == NULL) goto EXPAND_FAILED;
5454 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5456 if (item_type == EITEM_REDUCE)
5458 while (isspace(*s)) s++;
5459 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5460 temp = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
5461 if (temp == NULL) goto EXPAND_FAILED;
5462 lookup_value = temp;
5463 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5466 while (isspace(*s)) s++;
5467 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5471 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
5472 if scanning a "false" part). This allows us to find the end of the
5473 condition, because if the list is empty, we won't actually evaluate the
5474 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
5475 the normal internal expansion function. */
5477 if (item_type == EITEM_FILTER)
5479 temp = eval_condition(expr, &resetok, NULL);
5480 if (temp != NULL) s = temp;
5484 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
5489 expand_string_message = string_sprintf("%s inside \"%s\" item",
5490 expand_string_message, name);
5494 while (isspace(*s)) s++;
5497 expand_string_message = string_sprintf("missing } at end of condition "
5498 "or expression inside \"%s\"", name);
5502 while (isspace(*s)) s++; /*{*/
5505 expand_string_message = string_sprintf("missing } at end of \"%s\"",
5510 /* If we are skipping, we can now just move on to the next item. When
5511 processing for real, we perform the iteration. */
5513 if (skipping) continue;
5514 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)) != NULL)
5516 *outsep = (uschar)sep; /* Separator as a string */
5518 DEBUG(D_expand) debug_printf("%s: $item = \"%s\"\n", name, iterate_item);
5520 if (item_type == EITEM_FILTER)
5523 if (eval_condition(expr, &resetok, &condresult) == NULL)
5525 iterate_item = save_iterate_item;
5526 lookup_value = save_lookup_value;
5527 expand_string_message = string_sprintf("%s inside \"%s\" condition",
5528 expand_string_message, name);
5531 DEBUG(D_expand) debug_printf("%s: condition is %s\n", name,
5532 condresult? "true":"false");
5534 temp = iterate_item; /* TRUE => include this item */
5536 continue; /* FALSE => skip this item */
5539 /* EITEM_MAP and EITEM_REDUCE */
5543 temp = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
5546 iterate_item = save_iterate_item;
5547 expand_string_message = string_sprintf("%s inside \"%s\" item",
5548 expand_string_message, name);
5551 if (item_type == EITEM_REDUCE)
5553 lookup_value = temp; /* Update the value of $value */
5554 continue; /* and continue the iteration */
5558 /* We reach here for FILTER if the condition is true, always for MAP,
5559 and never for REDUCE. The value in "temp" is to be added to the output
5560 list that is being created, ensuring that any occurrences of the
5561 separator character are doubled. Unless we are dealing with the first
5562 item of the output list, add in a space if the new item begins with the
5563 separator character, or is an empty string. */
5565 if (ptr != save_ptr && (temp[0] == *outsep || temp[0] == 0))
5566 yield = string_cat(yield, &size, &ptr, US" ", 1);
5568 /* Add the string in "temp" to the output list that we are building,
5569 This is done in chunks by searching for the separator character. */
5573 size_t seglen = Ustrcspn(temp, outsep);
5574 yield = string_cat(yield, &size, &ptr, temp, seglen + 1);
5576 /* If we got to the end of the string we output one character
5577 too many; backup and end the loop. Otherwise arrange to double the
5580 if (temp[seglen] == '\0') { ptr--; break; }
5581 yield = string_cat(yield, &size, &ptr, outsep, 1);
5585 /* Output a separator after the string: we will remove the redundant
5586 final one at the end. */
5588 yield = string_cat(yield, &size, &ptr, outsep, 1);
5589 } /* End of iteration over the list loop */
5591 /* REDUCE has generated no output above: output the final value of
5594 if (item_type == EITEM_REDUCE)
5596 yield = string_cat(yield, &size, &ptr, lookup_value,
5597 Ustrlen(lookup_value));
5598 lookup_value = save_lookup_value; /* Restore $value */
5601 /* FILTER and MAP generate lists: if they have generated anything, remove
5602 the redundant final separator. Even though an empty item at the end of a
5603 list does not count, this is tidier. */
5605 else if (ptr != save_ptr) ptr--;
5607 /* Restore preserved $item */
5609 iterate_item = save_iterate_item;
5614 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
5615 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
5616 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
5617 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
5619 #define EXPAND_DLFUNC_MAX_ARGS 8
5622 #ifndef EXPAND_DLFUNC
5623 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
5624 "is not included in this binary";
5627 #else /* EXPAND_DLFUNC */
5630 exim_dlfunc_t *func;
5633 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
5635 if ((expand_forbid & RDO_DLFUNC) != 0)
5637 expand_string_message =
5638 US"dynamically-loaded functions are not permitted";
5642 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
5643 TRUE, US"dlfunc", &resetok))
5645 case 1: goto EXPAND_FAILED_CURLY;
5647 case 3: goto EXPAND_FAILED;
5650 /* If skipping, we don't actually do anything */
5652 if (skipping) continue;
5654 /* Look up the dynamically loaded object handle in the tree. If it isn't
5655 found, dlopen() the file and put the handle in the tree for next time. */
5657 t = tree_search(dlobj_anchor, argv[0]);
5660 void *handle = dlopen(CS argv[0], RTLD_LAZY);
5663 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
5664 argv[0], dlerror());
5665 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
5668 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]));
5669 Ustrcpy(t->name, argv[0]);
5670 t->data.ptr = handle;
5671 (void)tree_insertnode(&dlobj_anchor, t);
5674 /* Having obtained the dynamically loaded object handle, look up the
5675 function pointer. */
5677 func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1]);
5680 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
5681 "%s", argv[1], argv[0], dlerror());
5682 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
5686 /* Call the function and work out what to do with the result. If it
5687 returns OK, we have a replacement string; if it returns DEFER then
5688 expansion has failed in a non-forced manner; if it returns FAIL then
5689 failure was forced; if it returns ERROR or any other value there's a
5690 problem, so panic slightly. In any case, assume that the function has
5691 side-effects on the store that must be preserved. */
5695 for (argc = 0; argv[argc] != NULL; argc++);
5696 status = func(&result, argc - 2, &argv[2]);
5699 if (result == NULL) result = US"";
5700 yield = string_cat(yield, &size, &ptr, result, Ustrlen(result));
5705 expand_string_message = result == NULL ? US"(no message)" : result;
5706 if(status == FAIL_FORCED) expand_string_forcedfail = TRUE;
5707 else if(status != FAIL)
5708 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
5709 argv[0], argv[1], status, expand_string_message);
5713 #endif /* EXPAND_DLFUNC */
5714 } /* EITEM_* switch */
5716 /* Control reaches here if the name is not recognized as one of the more
5717 complicated expansion items. Check for the "operator" syntax (name terminated
5718 by a colon). Some of the operators have arguments, separated by _ from the
5725 uschar *sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
5726 if (sub == NULL) goto EXPAND_FAILED;
5729 /* Owing to an historical mis-design, an underscore may be part of the
5730 operator name, or it may introduce arguments. We therefore first scan the
5731 table of names that contain underscores. If there is no match, we cut off
5732 the arguments and then scan the main table. */
5734 c = chop_match(name, op_table_underscore,
5735 sizeof(op_table_underscore)/sizeof(uschar *));
5739 arg = Ustrchr(name, '_');
5740 if (arg != NULL) *arg = 0;
5741 c = chop_match(name, op_table_main,
5742 sizeof(op_table_main)/sizeof(uschar *));
5743 if (c >= 0) c += sizeof(op_table_underscore)/sizeof(uschar *);
5744 if (arg != NULL) *arg++ = '_'; /* Put back for error messages */
5747 /* If we are skipping, we don't need to perform the operation at all.
5748 This matters for operations like "mask", because the data may not be
5749 in the correct format when skipping. For example, the expression may test
5750 for the existence of $sender_host_address before trying to mask it. For
5751 other operations, doing them may not fail, but it is a waste of time. */
5753 if (skipping && c >= 0) continue;
5755 /* Otherwise, switch on the operator type */
5762 unsigned long int n = Ustrtoul(sub, &t, 10);
5765 expand_string_message = string_sprintf("argument for base62 "
5766 "operator is \"%s\", which is not a decimal number", sub);
5769 t = string_base62(n);
5770 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
5774 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
5780 unsigned long int n = 0;
5783 uschar *t = Ustrchr(base62_chars, *tt++);
5786 expand_string_message = string_sprintf("argument for base62d "
5787 "operator is \"%s\", which is not a base %d number", sub,
5791 n = n * BASE_62 + (t - base62_chars);
5793 (void)sprintf(CS buf, "%ld", n);
5794 yield = string_cat(yield, &size, &ptr, buf, Ustrlen(buf));
5800 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
5801 if (expanded == NULL)
5803 expand_string_message =
5804 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
5805 expand_string_message);
5808 yield = string_cat(yield, &size, &ptr, expanded, Ustrlen(expanded));
5815 uschar *t = sub - 1;
5816 while (*(++t) != 0) { *t = tolower(*t); count++; }
5817 yield = string_cat(yield, &size, &ptr, sub, count);
5824 uschar *t = sub - 1;
5825 while (*(++t) != 0) { *t = toupper(*t); count++; }
5826 yield = string_cat(yield, &size, &ptr, sub, count);
5837 md5_end(&base, sub, Ustrlen(sub), digest);
5838 for(j = 0; j < 16; j++) sprintf(st+2*j, "%02x", digest[j]);
5839 yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st));
5850 sha1_end(&base, sub, Ustrlen(sub), digest);
5851 for(j = 0; j < 20; j++) sprintf(st+2*j, "%02X", digest[j]);
5852 yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st));
5856 /* Convert hex encoding to base64 encoding */
5866 for (enc = sub; *enc != 0; enc++)
5868 if (!isxdigit(*enc))
5870 expand_string_message = string_sprintf("\"%s\" is not a hex "
5879 expand_string_message = string_sprintf("\"%s\" contains an odd "
5880 "number of characters", sub);
5884 while ((c = *in++) != 0)
5886 if (isdigit(c)) c -= '0';
5887 else c = toupper(c) - 'A' + 10;
5899 enc = auth_b64encode(sub, out - sub);
5900 yield = string_cat(yield, &size, &ptr, enc, Ustrlen(enc));
5904 /* Convert octets outside 0x21..0x7E to \xXX form */
5908 uschar *t = sub - 1;
5911 if (*t < 0x21 || 0x7E < *t)
5912 yield = string_cat(yield, &size, &ptr,
5913 string_sprintf("\\x%02x", *t), 4);
5915 yield = string_cat(yield, &size, &ptr, t, 1);
5920 /* count the number of list elements */
5929 while (string_nextinlist(&sub, &sep, buffer, sizeof(buffer)) != NULL) cnt++;
5930 cp = string_sprintf("%d", cnt);
5931 yield = string_cat(yield, &size, &ptr, cp, Ustrlen(cp));
5935 /* expand a named list given the name */
5936 /* handles nested named lists; requotes as colon-sep list */
5940 tree_node *t = NULL;
5944 uschar * suffix = US"";
5945 BOOL needsep = FALSE;
5948 if (*sub == '+') sub++;
5949 if (arg == NULL) /* no-argument version */
5951 if (!(t = tree_search(addresslist_anchor, sub)) &&
5952 !(t = tree_search(domainlist_anchor, sub)) &&
5953 !(t = tree_search(hostlist_anchor, sub)))
5954 t = tree_search(localpartlist_anchor, sub);
5956 else switch(*arg) /* specific list-type version */
5958 case 'a': t = tree_search(addresslist_anchor, sub); suffix = US"_a"; break;
5959 case 'd': t = tree_search(domainlist_anchor, sub); suffix = US"_d"; break;
5960 case 'h': t = tree_search(hostlist_anchor, sub); suffix = US"_h"; break;
5961 case 'l': t = tree_search(localpartlist_anchor, sub); suffix = US"_l"; break;
5963 expand_string_message = string_sprintf("bad suffix on \"list\" operator");
5969 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
5971 : *arg=='a'?"address "
5972 : *arg=='d'?"domain "
5974 : *arg=='l'?"localpart "
5979 list = ((namedlist_block *)(t->data.ptr))->string;
5981 while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
5983 uschar * buf = US" : ";
5985 yield = string_cat(yield, &size, &ptr, buf, 3);
5989 if (*item == '+') /* list item is itself a named list */
5991 uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item);
5992 item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE, &resetok);
5994 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
5998 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
5999 while ((cp= strpbrk((const char *)item, tok)))
6001 yield = string_cat(yield, &size, &ptr, item, cp-(char *)item);
6002 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
6004 yield = string_cat(yield, &size, &ptr, US"::", 2);
6005 item = (uschar *)cp;
6007 else /* sep in item; should already be doubled; emit once */
6009 yield = string_cat(yield, &size, &ptr, (uschar *)tok, 1);
6010 if (*cp == sep) cp++;
6011 item = (uschar *)cp;
6015 yield = string_cat(yield, &size, &ptr, item, Ustrlen(item));
6020 /* mask applies a mask to an IP address; for example the result of
6021 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
6028 int mask, maskoffset;
6029 int type = string_is_ip_address(sub, &maskoffset);
6034 expand_string_message = string_sprintf("\"%s\" is not an IP address",
6039 if (maskoffset == 0)
6041 expand_string_message = string_sprintf("missing mask value in \"%s\"",
6046 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
6048 if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128))
6050 expand_string_message = string_sprintf("mask value too big in \"%s\"",
6055 /* Convert the address to binary integer(s) and apply the mask */
6057 sub[maskoffset] = 0;
6058 count = host_aton(sub, binary);
6059 host_mask(count, binary, mask);
6061 /* Convert to masked textual format and add to output. */
6063 yield = string_cat(yield, &size, &ptr, buffer,
6064 host_nmtoa(count, binary, mask, buffer, '.'));
6069 case EOP_LOCAL_PART:
6073 int start, end, domain;
6074 uschar *t = parse_extract_address(sub, &error, &start, &end, &domain,
6078 if (c != EOP_DOMAIN)
6080 if (c == EOP_LOCAL_PART && domain != 0) end = start + domain - 1;
6081 yield = string_cat(yield, &size, &ptr, sub+start, end-start);
6083 else if (domain != 0)
6086 yield = string_cat(yield, &size, &ptr, sub+domain, end-domain);
6094 uschar outsep[2] = { ':', '\0' };
6095 uschar *address, *error;
6097 int start, end, domain; /* Not really used */
6099 while (isspace(*sub)) sub++;
6100 if (*sub == '>') { *outsep = *++sub; ++sub; }
6101 parse_allow_group = TRUE;
6105 uschar *p = parse_find_address_end(sub, FALSE);
6106 uschar saveend = *p;
6108 address = parse_extract_address(sub, &error, &start, &end, &domain,
6112 /* Add the address to the output list that we are building. This is
6113 done in chunks by searching for the separator character. At the
6114 start, unless we are dealing with the first address of the output
6115 list, add in a space if the new address begins with the separator
6116 character, or is an empty string. */
6118 if (address != NULL)
6120 if (ptr != save_ptr && address[0] == *outsep)
6121 yield = string_cat(yield, &size, &ptr, US" ", 1);
6125 size_t seglen = Ustrcspn(address, outsep);
6126 yield = string_cat(yield, &size, &ptr, address, seglen + 1);
6128 /* If we got to the end of the string we output one character
6131 if (address[seglen] == '\0') { ptr--; break; }
6132 yield = string_cat(yield, &size, &ptr, outsep, 1);
6133 address += seglen + 1;
6136 /* Output a separator after the string: we will remove the
6137 redundant final one at the end. */
6139 yield = string_cat(yield, &size, &ptr, outsep, 1);
6142 if (saveend == '\0') break;
6146 /* If we have generated anything, remove the redundant final
6149 if (ptr != save_ptr) ptr--;
6150 parse_allow_group = FALSE;
6155 /* quote puts a string in quotes if it is empty or contains anything
6156 other than alphamerics, underscore, dot, or hyphen.
6158 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
6159 be quoted in order to be a valid local part.
6161 In both cases, newlines and carriage returns are converted into \n and \r
6165 case EOP_QUOTE_LOCAL_PART:
6168 BOOL needs_quote = (*sub == 0); /* TRUE for empty string */
6169 uschar *t = sub - 1;
6173 while (!needs_quote && *(++t) != 0)
6174 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
6176 else /* EOP_QUOTE_LOCAL_PART */
6178 while (!needs_quote && *(++t) != 0)
6179 needs_quote = !isalnum(*t) &&
6180 strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
6181 (*t != '.' || t == sub || t[1] == 0);
6186 yield = string_cat(yield, &size, &ptr, US"\"", 1);
6191 yield = string_cat(yield, &size, &ptr, US"\\n", 2);
6192 else if (*t == '\r')
6193 yield = string_cat(yield, &size, &ptr, US"\\r", 2);
6196 if (*t == '\\' || *t == '"')
6197 yield = string_cat(yield, &size, &ptr, US"\\", 1);
6198 yield = string_cat(yield, &size, &ptr, t, 1);
6201 yield = string_cat(yield, &size, &ptr, US"\"", 1);
6203 else yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub));
6207 /* quote_lookuptype does lookup-specific quoting */
6212 uschar *opt = Ustrchr(arg, '_');
6214 if (opt != NULL) *opt++ = 0;
6216 n = search_findtype(arg, Ustrlen(arg));
6219 expand_string_message = search_error_message;
6223 if (lookup_list[n]->quote != NULL)
6224 sub = (lookup_list[n]->quote)(sub, opt);
6225 else if (opt != NULL) sub = NULL;
6229 expand_string_message = string_sprintf(
6230 "\"%s\" unrecognized after \"${quote_%s\"",
6235 yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub));
6239 /* rx quote sticks in \ before any non-alphameric character so that
6240 the insertion works in a regular expression. */
6244 uschar *t = sub - 1;
6248 yield = string_cat(yield, &size, &ptr, US"\\", 1);
6249 yield = string_cat(yield, &size, &ptr, t, 1);
6254 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
6255 prescribed by the RFC, if there are characters that need to be encoded */
6259 uschar buffer[2048];
6260 uschar *string = parse_quote_2047(sub, Ustrlen(sub), headers_charset,
6261 buffer, sizeof(buffer), FALSE);
6262 yield = string_cat(yield, &size, &ptr, string, Ustrlen(string));
6266 /* RFC 2047 decode */
6272 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
6273 headers_charset, '?', &len, &error);
6276 expand_string_message = error;
6279 yield = string_cat(yield, &size, &ptr, decoded, len);
6283 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
6293 if (c > 255) c = '_';
6295 yield = string_cat(yield, &size, &ptr, buff, 1);
6300 /* replace illegal UTF-8 sequences by replacement character */
6302 #define UTF8_REPLACEMENT_CHAR US"?"
6306 int seq_len, index = 0;
6308 uschar seq_buff[4]; /* accumulate utf-8 here */
6320 if ((c & 0xc0) != 0x80)
6322 /* wrong continuation byte; invalidate all bytes */
6323 complete = 1; /* error */
6327 codepoint = (codepoint << 6) | (c & 0x3f);
6328 seq_buff[index++] = c;
6329 if (--bytes_left == 0) /* codepoint complete */
6331 if(codepoint > 0x10FFFF) /* is it too large? */
6332 complete = -1; /* error */
6334 { /* finished; output utf-8 sequence */
6335 yield = string_cat(yield, &size, &ptr, seq_buff, seq_len);
6341 else /* no bytes left: new sequence */
6343 if((c & 0x80) == 0) /* 1-byte sequence, US-ASCII, keep it */
6345 yield = string_cat(yield, &size, &ptr, &c, 1);
6348 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
6350 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
6355 codepoint = c & 0x1f;
6358 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
6361 codepoint = c & 0x0f;
6363 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
6366 codepoint = c & 0x07;
6368 else /* invalid or too long (RFC3629 allows only 4 bytes) */
6371 seq_buff[index++] = c;
6372 seq_len = bytes_left + 1;
6373 } /* if(bytes_left) */
6377 bytes_left = index = 0;
6378 yield = string_cat(yield, &size, &ptr, UTF8_REPLACEMENT_CHAR, 1);
6380 if ((complete == 1) && ((c & 0x80) == 0))
6381 { /* ASCII character follows incomplete sequence */
6382 yield = string_cat(yield, &size, &ptr, &c, 1);
6388 /* escape turns all non-printing characters into escape sequences. */
6392 uschar *t = string_printing(sub);
6393 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
6397 /* Handle numeric expression evaluation */
6402 uschar *save_sub = sub;
6403 uschar *error = NULL;
6404 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
6407 expand_string_message = string_sprintf("error in expression "
6408 "evaluation: %s (after processing \"%.*s\")", error, sub-save_sub,
6412 sprintf(CS var_buffer, PR_EXIM_ARITH, n);
6413 yield = string_cat(yield, &size, &ptr, var_buffer, Ustrlen(var_buffer));
6417 /* Handle time period formating */
6421 int n = readconf_readtime(sub, 0, FALSE);
6424 expand_string_message = string_sprintf("string \"%s\" is not an "
6425 "Exim time interval in \"%s\" operator", sub, name);
6428 sprintf(CS var_buffer, "%d", n);
6429 yield = string_cat(yield, &size, &ptr, var_buffer, Ustrlen(var_buffer));
6433 case EOP_TIME_INTERVAL:
6436 uschar *t = read_number(&n, sub);
6437 if (*t != 0) /* Not A Number*/
6439 expand_string_message = string_sprintf("string \"%s\" is not a "
6440 "positive number in \"%s\" operator", sub, name);
6443 t = readconf_printtime(n);
6444 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
6448 /* Convert string to base64 encoding */
6452 uschar *encstr = auth_b64encode(sub, Ustrlen(sub));
6453 yield = string_cat(yield, &size, &ptr, encstr, Ustrlen(encstr));
6457 /* strlen returns the length of the string */
6462 (void)sprintf(CS buff, "%d", Ustrlen(sub));
6463 yield = string_cat(yield, &size, &ptr, buff, Ustrlen(buff));
6467 /* length_n or l_n takes just the first n characters or the whole string,
6468 whichever is the shorter;
6470 substr_m_n, and s_m_n take n characters from offset m; negative m take
6471 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
6472 takes the rest, either to the right or to the left.
6474 hash_n or h_n makes a hash of length n from the string, yielding n
6475 characters from the set a-z; hash_n_m makes a hash of length n, but
6476 uses m characters from the set a-zA-Z0-9.
6478 nhash_n returns a single number between 0 and n-1 (in text form), while
6479 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
6480 between 0 and n-1 and the second between 0 and m-1. */
6500 expand_string_message = string_sprintf("missing values after %s",
6505 /* "length" has only one argument, effectively being synonymous with
6508 if (c == EOP_LENGTH || c == EOP_L)
6514 /* The others have one or two arguments; for "substr" the first may be
6515 negative. The second being negative means "not supplied". */
6520 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
6523 /* Read up to two numbers, separated by underscores */
6528 if (arg != ret && *arg == '_' && pn == &value1)
6532 if (arg[1] != 0) arg++;
6534 else if (!isdigit(*arg))
6536 expand_string_message =
6537 string_sprintf("non-digit after underscore in \"%s\"", name);
6540 else *pn = (*pn)*10 + *arg++ - '0';
6544 /* Perform the required operation */
6547 (c == EOP_HASH || c == EOP_H)?
6548 compute_hash(sub, value1, value2, &len) :
6549 (c == EOP_NHASH || c == EOP_NH)?
6550 compute_nhash(sub, value1, value2, &len) :
6551 extract_substr(sub, value1, value2, &len);
6553 if (ret == NULL) goto EXPAND_FAILED;
6554 yield = string_cat(yield, &size, &ptr, ret, len);
6564 uschar **modetable[3];
6569 if ((expand_forbid & RDO_EXISTS) != 0)
6571 expand_string_message = US"Use of the stat() expansion is not permitted";
6575 if (stat(CS sub, &st) < 0)
6577 expand_string_message = string_sprintf("stat(%s) failed: %s",
6578 sub, strerror(errno));
6582 switch (mode & S_IFMT)
6584 case S_IFIFO: smode[0] = 'p'; break;
6585 case S_IFCHR: smode[0] = 'c'; break;
6586 case S_IFDIR: smode[0] = 'd'; break;
6587 case S_IFBLK: smode[0] = 'b'; break;
6588 case S_IFREG: smode[0] = '-'; break;
6589 default: smode[0] = '?'; break;
6592 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
6593 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
6594 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
6596 for (i = 0; i < 3; i++)
6598 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
6603 s = string_sprintf("mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
6604 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
6605 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
6606 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
6607 (long)st.st_gid, st.st_size, (long)st.st_atime,
6608 (long)st.st_mtime, (long)st.st_ctime);
6609 yield = string_cat(yield, &size, &ptr, s, Ustrlen(s));
6613 /* vaguely random number less than N */
6617 int_eximarith_t max;
6620 max = expand_string_integer(sub, TRUE);
6621 if (expand_string_message != NULL)
6623 s = string_sprintf("%d", vaguely_random_number((int)max));
6624 yield = string_cat(yield, &size, &ptr, s, Ustrlen(s));
6628 /* Reverse IP, including IPv6 to dotted-nibble */
6630 case EOP_REVERSE_IP:
6632 int family, maskptr;
6633 uschar reversed[128];
6635 family = string_is_ip_address(sub, &maskptr);
6638 expand_string_message = string_sprintf(
6639 "reverse_ip() not given an IP address [%s]", sub);
6642 invert_address(reversed, sub);
6643 yield = string_cat(yield, &size, &ptr, reversed, Ustrlen(reversed));
6647 /* Unknown operator */
6650 expand_string_message =
6651 string_sprintf("unknown expansion operator \"%s\"", name);
6656 /* Handle a plain name. If this is the first thing in the expansion, release
6657 the pre-allocated buffer. If the result data is known to be in a new buffer,
6658 newsize will be set to the size of that buffer, and we can just point at that
6659 store instead of copying. Many expansion strings contain just one reference,
6660 so this is a useful optimization, especially for humungous headers
6661 ($message_headers). */
6669 if (resetok) store_reset(yield);
6673 value = find_variable(name, FALSE, skipping, &newsize);
6676 expand_string_message =
6677 string_sprintf("unknown variable in \"${%s}\"", name);
6678 check_variable_error_message(name);
6681 len = Ustrlen(value);
6682 if (yield == NULL && newsize != 0)
6688 else yield = string_cat(yield, &size, &ptr, value, len);
6692 /* Else there's something wrong */
6694 expand_string_message =
6695 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
6696 "in a variable reference)", name);
6700 /* If we hit the end of the string when ket_ends is set, there is a missing
6701 terminating brace. */
6703 if (ket_ends && *s == 0)
6705 expand_string_message = malformed_header?
6706 US"missing } at end of string - could be header name not terminated by colon"
6708 US"missing } at end of string";
6712 /* Expansion succeeded; yield may still be NULL here if nothing was actually
6713 added to the string. If so, set up an empty string. Add a terminating zero. If
6714 left != NULL, return a pointer to the terminator. */
6716 if (yield == NULL) yield = store_get(1);
6718 if (left != NULL) *left = s;
6720 /* Any stacking store that was used above the final string is no longer needed.
6721 In many cases the final string will be the first one that was got and so there
6722 will be optimal store usage. */
6724 if (resetok) store_reset(yield + ptr + 1);
6725 else if (resetok_p) *resetok_p = FALSE;
6729 debug_printf("expanding: %.*s\n result: %s\n", (int)(s - string), string,
6731 if (skipping) debug_printf("skipping: result is not used\n");
6735 /* This is the failure exit: easiest to program with a goto. We still need
6736 to update the pointer to the terminator, for cases of nested calls with "fail".
6739 EXPAND_FAILED_CURLY:
6740 expand_string_message = malformed_header?
6741 US"missing or misplaced { or } - could be header name not terminated by colon"
6743 US"missing or misplaced { or }";
6745 /* At one point, Exim reset the store to yield (if yield was not NULL), but
6746 that is a bad idea, because expand_string_message is in dynamic store. */
6749 if (left != NULL) *left = s;
6752 debug_printf("failed to expand: %s\n", string);
6753 debug_printf(" error message: %s\n", expand_string_message);
6754 if (expand_string_forcedfail) debug_printf("failure was forced\n");
6756 if (resetok_p) *resetok_p = resetok;
6761 /* This is the external function call. Do a quick check for any expansion
6762 metacharacters, and if there are none, just return the input string.
6764 Argument: the string to be expanded
6765 Returns: the expanded string, or NULL if expansion failed; if failure was
6766 due to a lookup deferring, search_find_defer will be TRUE
6770 expand_string(uschar *string)
6772 search_find_defer = FALSE;
6773 malformed_header = FALSE;
6774 return (Ustrpbrk(string, "$\\") == NULL)? string :
6775 expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
6780 /*************************************************
6782 *************************************************/
6784 /* Now and again we want to expand a string and be sure that the result is in a
6785 new bit of store. This function does that.
6787 Argument: the string to be expanded
6788 Returns: the expanded string, always in a new bit of store, or NULL
6792 expand_string_copy(uschar *string)
6794 uschar *yield = expand_string(string);
6795 if (yield == string) yield = string_copy(string);
6801 /*************************************************
6802 * Expand and interpret as an integer *
6803 *************************************************/
6805 /* Expand a string, and convert the result into an integer.
6808 string the string to be expanded
6809 isplus TRUE if a non-negative number is expected
6811 Returns: the integer value, or
6812 -1 for an expansion error ) in both cases, message in
6813 -2 for an integer interpretation error ) expand_string_message
6814 expand_string_message is set NULL for an OK integer
6818 expand_string_integer(uschar *string, BOOL isplus)
6820 int_eximarith_t value;
6821 uschar *s = expand_string(string);
6822 uschar *msg = US"invalid integer \"%s\"";
6825 /* If expansion failed, expand_string_message will be set. */
6827 if (s == NULL) return -1;
6829 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
6830 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
6831 systems, so we set it zero ourselves. */
6834 expand_string_message = NULL; /* Indicates no error */
6836 /* Before Exim 4.64, strings consisting entirely of whitespace compared
6837 equal to 0. Unfortunately, people actually relied upon that, so preserve
6838 the behaviour explicitly. Stripping leading whitespace is a harmless
6839 noop change since strtol skips it anyway (provided that there is a number
6843 while (isspace(*s)) ++s;
6847 debug_printf("treating blank string as number 0\n");
6852 value = strtoll(CS s, CSS &endptr, 10);
6856 msg = US"integer expected but \"%s\" found";
6858 else if (value < 0 && isplus)
6860 msg = US"non-negative integer expected but \"%s\" found";
6864 switch (tolower(*endptr))
6869 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
6874 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
6875 else value *= 1024*1024;
6879 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
6880 else value *= 1024*1024*1024;
6884 if (errno == ERANGE)
6885 msg = US"absolute value of integer \"%s\" is too large (overflow)";
6888 while (isspace(*endptr)) endptr++;
6889 if (*endptr == 0) return value;
6893 expand_string_message = string_sprintf(CS msg, s);
6898 /*************************************************
6899 **************************************************
6900 * Stand-alone test program *
6901 **************************************************
6902 *************************************************/
6908 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
6910 int ovector[3*(EXPAND_MAXN+1)];
6911 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
6912 ovector, sizeof(ovector)/sizeof(int));
6913 BOOL yield = n >= 0;
6914 if (n == 0) n = EXPAND_MAXN + 1;
6918 expand_nmax = (setup < 0)? 0 : setup + 1;
6919 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
6921 expand_nstring[expand_nmax] = subject + ovector[nn];
6922 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
6930 int main(int argc, uschar **argv)
6933 uschar buffer[1024];
6935 debug_selector = D_v;
6936 debug_file = stderr;
6937 debug_fd = fileno(debug_file);
6938 big_buffer = malloc(big_buffer_size);
6940 for (i = 1; i < argc; i++)
6942 if (argv[i][0] == '+')
6944 debug_trace_memory = 2;
6947 if (isdigit(argv[i][0]))
6948 debug_selector = Ustrtol(argv[i], NULL, 0);
6950 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
6954 eldap_default_servers = argv[i];
6957 mysql_servers = argv[i];
6960 pgsql_servers = argv[i];
6962 #ifdef EXPERIMENTAL_REDIS
6963 redis_servers = argv[i];
6967 else opt_perl_startup = argv[i];
6971 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
6973 expand_nstring[1] = US"string 1....";
6974 expand_nlength[1] = 8;
6978 if (opt_perl_startup != NULL)
6981 printf("Starting Perl interpreter\n");
6982 errstr = init_perl(opt_perl_startup);
6985 printf("** error in perl_startup code: %s\n", errstr);
6986 return EXIT_FAILURE;
6989 #endif /* EXIM_PERL */
6991 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
6993 void *reset_point = store_get(0);
6994 uschar *yield = expand_string(buffer);
6997 printf("%s\n", yield);
6998 store_reset(reset_point);
7002 if (search_find_defer) printf("search_find deferred\n");
7003 printf("Failed: %s\n", expand_string_message);
7004 if (expand_string_forcedfail) printf("Forced failure\n");
7018 /* End of expand.c */