1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
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);
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 /*************************************************
98 * Local statics and tables *
99 *************************************************/
101 /* Table of item names, and corresponding switch numbers. The names must be in
102 alphabetical order. */
104 static uschar *item_table[] = {
150 /* Tables of operator names, and corresponding switch numbers. The names must be
151 in alphabetical order. There are two tables, because underscore is used in some
152 cases to introduce arguments, whereas for other it is part of the name. This is
153 an historical mis-design. */
155 static uschar *op_table_underscore[] = {
158 US"quote_local_part",
166 EOP_QUOTE_LOCAL_PART,
171 static uschar *op_table_main[] = {
207 EOP_ADDRESS = sizeof(op_table_underscore)/sizeof(uschar *),
242 /* Table of condition names, and corresponding switch numbers. The names must
243 be in alphabetical order. */
245 static uschar *cond_table[] = {
249 US"==", /* Backward compatibility */
282 US"match_local_part",
307 ECOND_FIRST_DELIVERY,
328 ECOND_MATCH_LOCAL_PART,
338 /* Type for main variable table */
346 /* Type for entries pointing to address/length pairs. Not currently
354 /* Types of table entry */
357 vtype_int, /* value is address of int */
358 vtype_filter_int, /* ditto, but recognized only when filtering */
359 vtype_ino, /* value is address of ino_t (not always an int) */
360 vtype_uid, /* value is address of uid_t (not always an int) */
361 vtype_gid, /* value is address of gid_t (not always an int) */
362 vtype_bool, /* value is address of bool */
363 vtype_stringptr, /* value is address of pointer to string */
364 vtype_msgbody, /* as stringptr, but read when first required */
365 vtype_msgbody_end, /* ditto, the end of the message */
366 vtype_msgheaders, /* the message's headers, processed */
367 vtype_msgheaders_raw, /* the message's headers, unprocessed */
368 vtype_localpart, /* extract local part from string */
369 vtype_domain, /* extract domain from string */
370 vtype_recipients, /* extract recipients from recipients list */
371 /* (available only in system filters, ACLs, and */
373 vtype_todbsdin, /* value not used; generate BSD inbox tod */
374 vtype_tode, /* value not used; generate tod in epoch format */
375 vtype_todel, /* value not used; generate tod in epoch/usec format */
376 vtype_todf, /* value not used; generate full tod */
377 vtype_todl, /* value not used; generate log tod */
378 vtype_todlf, /* value not used; generate log file datestamp tod */
379 vtype_todzone, /* value not used; generate time zone only */
380 vtype_todzulu, /* value not used; generate zulu tod */
381 vtype_reply, /* value not used; get reply from headers */
382 vtype_pid, /* value not used; result is pid */
383 vtype_host_lookup, /* value not used; get host name */
384 vtype_load_avg, /* value not used; result is int from os_getloadavg */
385 vtype_pspace, /* partition space; value is T/F for spool/log */
386 vtype_pinodes /* partition inodes; value is T/F for spool/log */
388 ,vtype_dkim /* Lookup of value in DKIM signature */
392 /* This table must be kept in alphabetical order. */
394 static var_entry var_table[] = {
395 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
396 they will be confused with user-creatable ACL variables. */
397 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
398 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
399 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
400 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
401 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
402 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
403 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
404 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
405 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
406 { "acl_narg", vtype_int, &acl_narg },
407 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
408 { "address_data", vtype_stringptr, &deliver_address_data },
409 { "address_file", vtype_stringptr, &address_file },
410 { "address_pipe", vtype_stringptr, &address_pipe },
411 { "authenticated_id", vtype_stringptr, &authenticated_id },
412 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
413 { "authentication_failed",vtype_int, &authentication_failed },
414 #ifdef WITH_CONTENT_SCAN
415 { "av_failed", vtype_int, &av_failed },
417 #ifdef EXPERIMENTAL_BRIGHTMAIL
418 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
419 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
420 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
421 { "bmi_deliver", vtype_int, &bmi_deliver },
423 { "body_linecount", vtype_int, &body_linecount },
424 { "body_zerocount", vtype_int, &body_zerocount },
425 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
426 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
427 { "caller_gid", vtype_gid, &real_gid },
428 { "caller_uid", vtype_uid, &real_uid },
429 { "compile_date", vtype_stringptr, &version_date },
430 { "compile_number", vtype_stringptr, &version_cnumber },
431 { "csa_status", vtype_stringptr, &csa_status },
432 #ifdef EXPERIMENTAL_DCC
433 { "dcc_header", vtype_stringptr, &dcc_header },
434 { "dcc_result", vtype_stringptr, &dcc_result },
436 #ifdef WITH_OLD_DEMIME
437 { "demime_errorlevel", vtype_int, &demime_errorlevel },
438 { "demime_reason", vtype_stringptr, &demime_reason },
441 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
442 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
443 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
444 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
445 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
446 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
447 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
448 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
449 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
450 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
451 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
452 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
453 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
454 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
455 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
456 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
457 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
458 { "dkim_signers", vtype_stringptr, &dkim_signers },
459 { "dkim_verify_reason", vtype_dkim, (void *)DKIM_VERIFY_REASON },
460 { "dkim_verify_status", vtype_dkim, (void *)DKIM_VERIFY_STATUS},
462 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
463 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
464 { "dnslist_text", vtype_stringptr, &dnslist_text },
465 { "dnslist_value", vtype_stringptr, &dnslist_value },
466 { "domain", vtype_stringptr, &deliver_domain },
467 { "domain_data", vtype_stringptr, &deliver_domain_data },
468 { "exim_gid", vtype_gid, &exim_gid },
469 { "exim_path", vtype_stringptr, &exim_path },
470 { "exim_uid", vtype_uid, &exim_uid },
471 #ifdef WITH_OLD_DEMIME
472 { "found_extension", vtype_stringptr, &found_extension },
474 { "home", vtype_stringptr, &deliver_home },
475 { "host", vtype_stringptr, &deliver_host },
476 { "host_address", vtype_stringptr, &deliver_host_address },
477 { "host_data", vtype_stringptr, &host_data },
478 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
479 { "host_lookup_failed", vtype_int, &host_lookup_failed },
480 { "inode", vtype_ino, &deliver_inode },
481 { "interface_address", vtype_stringptr, &interface_address },
482 { "interface_port", vtype_int, &interface_port },
483 { "item", vtype_stringptr, &iterate_item },
485 { "ldap_dn", vtype_stringptr, &eldap_dn },
487 { "load_average", vtype_load_avg, NULL },
488 { "local_part", vtype_stringptr, &deliver_localpart },
489 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
490 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
491 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
492 { "local_scan_data", vtype_stringptr, &local_scan_data },
493 { "local_user_gid", vtype_gid, &local_user_gid },
494 { "local_user_uid", vtype_uid, &local_user_uid },
495 { "localhost_number", vtype_int, &host_number },
496 { "log_inodes", vtype_pinodes, (void *)FALSE },
497 { "log_space", vtype_pspace, (void *)FALSE },
498 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
499 #ifdef WITH_CONTENT_SCAN
500 { "malware_name", vtype_stringptr, &malware_name },
502 { "max_received_linelength", vtype_int, &max_received_linelength },
503 { "message_age", vtype_int, &message_age },
504 { "message_body", vtype_msgbody, &message_body },
505 { "message_body_end", vtype_msgbody_end, &message_body_end },
506 { "message_body_size", vtype_int, &message_body_size },
507 { "message_exim_id", vtype_stringptr, &message_id },
508 { "message_headers", vtype_msgheaders, NULL },
509 { "message_headers_raw", vtype_msgheaders_raw, NULL },
510 { "message_id", vtype_stringptr, &message_id },
511 { "message_linecount", vtype_int, &message_linecount },
512 { "message_size", vtype_int, &message_size },
513 #ifdef WITH_CONTENT_SCAN
514 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
515 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
516 { "mime_boundary", vtype_stringptr, &mime_boundary },
517 { "mime_charset", vtype_stringptr, &mime_charset },
518 { "mime_content_description", vtype_stringptr, &mime_content_description },
519 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
520 { "mime_content_id", vtype_stringptr, &mime_content_id },
521 { "mime_content_size", vtype_int, &mime_content_size },
522 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
523 { "mime_content_type", vtype_stringptr, &mime_content_type },
524 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
525 { "mime_filename", vtype_stringptr, &mime_filename },
526 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
527 { "mime_is_multipart", vtype_int, &mime_is_multipart },
528 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
529 { "mime_part_count", vtype_int, &mime_part_count },
531 { "n0", vtype_filter_int, &filter_n[0] },
532 { "n1", vtype_filter_int, &filter_n[1] },
533 { "n2", vtype_filter_int, &filter_n[2] },
534 { "n3", vtype_filter_int, &filter_n[3] },
535 { "n4", vtype_filter_int, &filter_n[4] },
536 { "n5", vtype_filter_int, &filter_n[5] },
537 { "n6", vtype_filter_int, &filter_n[6] },
538 { "n7", vtype_filter_int, &filter_n[7] },
539 { "n8", vtype_filter_int, &filter_n[8] },
540 { "n9", vtype_filter_int, &filter_n[9] },
541 { "original_domain", vtype_stringptr, &deliver_domain_orig },
542 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
543 { "originator_gid", vtype_gid, &originator_gid },
544 { "originator_uid", vtype_uid, &originator_uid },
545 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
546 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
547 { "pid", vtype_pid, NULL },
548 { "primary_hostname", vtype_stringptr, &primary_hostname },
549 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
550 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
551 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
552 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
553 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
554 { "rcpt_count", vtype_int, &rcpt_count },
555 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
556 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
557 { "received_count", vtype_int, &received_count },
558 { "received_for", vtype_stringptr, &received_for },
559 { "received_ip_address", vtype_stringptr, &interface_address },
560 { "received_port", vtype_int, &interface_port },
561 { "received_protocol", vtype_stringptr, &received_protocol },
562 { "received_time", vtype_int, &received_time },
563 { "recipient_data", vtype_stringptr, &recipient_data },
564 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
565 { "recipients", vtype_recipients, NULL },
566 { "recipients_count", vtype_int, &recipients_count },
567 #ifdef WITH_CONTENT_SCAN
568 { "regex_match_string", vtype_stringptr, ®ex_match_string },
570 { "reply_address", vtype_reply, NULL },
571 { "return_path", vtype_stringptr, &return_path },
572 { "return_size_limit", vtype_int, &bounce_return_size_limit },
573 { "runrc", vtype_int, &runrc },
574 { "self_hostname", vtype_stringptr, &self_hostname },
575 { "sender_address", vtype_stringptr, &sender_address },
576 { "sender_address_data", vtype_stringptr, &sender_address_data },
577 { "sender_address_domain", vtype_domain, &sender_address },
578 { "sender_address_local_part", vtype_localpart, &sender_address },
579 { "sender_data", vtype_stringptr, &sender_data },
580 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
581 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
582 { "sender_host_address", vtype_stringptr, &sender_host_address },
583 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
584 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
585 { "sender_host_name", vtype_host_lookup, NULL },
586 { "sender_host_port", vtype_int, &sender_host_port },
587 { "sender_ident", vtype_stringptr, &sender_ident },
588 { "sender_rate", vtype_stringptr, &sender_rate },
589 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
590 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
591 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
592 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
593 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
594 { "sending_port", vtype_int, &sending_port },
595 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
596 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
597 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
598 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
599 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
600 { "sn0", vtype_filter_int, &filter_sn[0] },
601 { "sn1", vtype_filter_int, &filter_sn[1] },
602 { "sn2", vtype_filter_int, &filter_sn[2] },
603 { "sn3", vtype_filter_int, &filter_sn[3] },
604 { "sn4", vtype_filter_int, &filter_sn[4] },
605 { "sn5", vtype_filter_int, &filter_sn[5] },
606 { "sn6", vtype_filter_int, &filter_sn[6] },
607 { "sn7", vtype_filter_int, &filter_sn[7] },
608 { "sn8", vtype_filter_int, &filter_sn[8] },
609 { "sn9", vtype_filter_int, &filter_sn[9] },
610 #ifdef WITH_CONTENT_SCAN
611 { "spam_bar", vtype_stringptr, &spam_bar },
612 { "spam_report", vtype_stringptr, &spam_report },
613 { "spam_score", vtype_stringptr, &spam_score },
614 { "spam_score_int", vtype_stringptr, &spam_score_int },
616 #ifdef EXPERIMENTAL_SPF
617 { "spf_guess", vtype_stringptr, &spf_guess },
618 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
619 { "spf_received", vtype_stringptr, &spf_received },
620 { "spf_result", vtype_stringptr, &spf_result },
621 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
623 { "spool_directory", vtype_stringptr, &spool_directory },
624 { "spool_inodes", vtype_pinodes, (void *)TRUE },
625 { "spool_space", vtype_pspace, (void *)TRUE },
626 #ifdef EXPERIMENTAL_SRS
627 { "srs_db_address", vtype_stringptr, &srs_db_address },
628 { "srs_db_key", vtype_stringptr, &srs_db_key },
629 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
630 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
631 { "srs_recipient", vtype_stringptr, &srs_recipient },
632 { "srs_status", vtype_stringptr, &srs_status },
634 { "thisaddress", vtype_stringptr, &filter_thisaddress },
636 /* The non-(in,out) variables are now deprecated */
637 { "tls_bits", vtype_int, &tls_in.bits },
638 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
639 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
641 { "tls_in_bits", vtype_int, &tls_in.bits },
642 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
643 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
644 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
645 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
646 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
648 { "tls_out_bits", vtype_int, &tls_out.bits },
649 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
650 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
651 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
652 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
653 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
656 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
657 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
658 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
661 { "tod_bsdinbox", vtype_todbsdin, NULL },
662 { "tod_epoch", vtype_tode, NULL },
663 { "tod_epoch_l", vtype_todel, NULL },
664 { "tod_full", vtype_todf, NULL },
665 { "tod_log", vtype_todl, NULL },
666 { "tod_logfile", vtype_todlf, NULL },
667 { "tod_zone", vtype_todzone, NULL },
668 { "tod_zulu", vtype_todzulu, NULL },
669 { "value", vtype_stringptr, &lookup_value },
670 { "version_number", vtype_stringptr, &version_string },
671 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
672 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
673 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
674 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
675 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
676 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
679 static int var_table_size = sizeof(var_table)/sizeof(var_entry);
680 static uschar var_buffer[256];
681 static BOOL malformed_header;
683 /* For textual hashes */
685 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
686 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
689 enum { HMAC_MD5, HMAC_SHA1 };
691 /* For numeric hashes */
693 static unsigned int prime[] = {
694 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
695 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
696 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
698 /* For printing modes in symbolic form */
700 static uschar *mtable_normal[] =
701 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
703 static uschar *mtable_setid[] =
704 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
706 static uschar *mtable_sticky[] =
707 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
711 /*************************************************
712 * Tables for UTF-8 support *
713 *************************************************/
715 /* Table of the number of extra characters, indexed by the first character
716 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
719 static uschar utf8_table1[] = {
720 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
721 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
722 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
723 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
725 /* These are the masks for the data bits in the first byte of a character,
726 indexed by the number of additional bytes. */
728 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
730 /* Get the next UTF-8 character, advancing the pointer. */
732 #define GETUTF8INC(c, ptr) \
734 if ((c & 0xc0) == 0xc0) \
736 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
738 c = (c & utf8_table2[a]) << s; \
742 c |= (*ptr++ & 0x3f) << s; \
747 /*************************************************
748 * Binary chop search on a table *
749 *************************************************/
751 /* This is used for matching expansion items and operators.
754 name the name that is being sought
755 table the table to search
756 table_size the number of items in the table
758 Returns: the offset in the table, or -1
762 chop_match(uschar *name, uschar **table, int table_size)
764 uschar **bot = table;
765 uschar **top = table + table_size;
769 uschar **mid = bot + (top - bot)/2;
770 int c = Ustrcmp(name, *mid);
771 if (c == 0) return mid - table;
772 if (c > 0) bot = mid + 1; else top = mid;
780 /*************************************************
781 * Check a condition string *
782 *************************************************/
784 /* This function is called to expand a string, and test the result for a "true"
785 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
786 forced fail or lookup defer. All store used by the function can be released on
789 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
792 condition the condition string
793 m1 text to be incorporated in panic error
796 Returns: TRUE if condition is met, FALSE if not
800 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
803 void *reset_point = store_get(0);
804 uschar *ss = expand_string(condition);
807 if (!expand_string_forcedfail && !search_find_defer)
808 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
809 "for %s %s: %s", condition, m1, m2, expand_string_message);
812 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
813 strcmpic(ss, US"false") != 0;
814 store_reset(reset_point);
821 /*************************************************
822 * Pseudo-random number generation *
823 *************************************************/
825 /* Pseudo-random number generation. The result is not "expected" to be
826 cryptographically strong but not so weak that someone will shoot themselves
827 in the foot using it as a nonce in some email header scheme or whatever
828 weirdness they'll twist this into. The result should ideally handle fork().
830 However, if we're stuck unable to provide this, then we'll fall back to
831 appallingly bad randomness.
833 If SUPPORT_TLS is defined then this will not be used except as an emergency
838 Returns a random number in range [0, max-1]
842 # define vaguely_random_number vaguely_random_number_fallback
845 vaguely_random_number(int max)
848 # undef vaguely_random_number
850 static pid_t pid = 0;
852 #if defined(HAVE_SRANDOM) && !defined(HAVE_SRANDOMDEV)
862 #ifdef HAVE_ARC4RANDOM
863 /* cryptographically strong randomness, common on *BSD platforms, not
864 so much elsewhere. Alas. */
866 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
867 #ifdef HAVE_SRANDOMDEV
868 /* uses random(4) for seeding */
871 gettimeofday(&tv, NULL);
872 srandom(tv.tv_sec | tv.tv_usec | getpid());
875 /* Poor randomness and no seeding here */
882 #ifdef HAVE_ARC4RANDOM
883 return arc4random() % max;
884 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
885 return random() % max;
887 /* This one returns a 16-bit number, definitely not crypto-strong */
888 return random_number(max);
895 /*************************************************
896 * Pick out a name from a string *
897 *************************************************/
899 /* If the name is too long, it is silently truncated.
902 name points to a buffer into which to put the name
903 max is the length of the buffer
904 s points to the first alphabetic character of the name
905 extras chars other than alphanumerics to permit
907 Returns: pointer to the first character after the name
909 Note: The test for *s != 0 in the while loop is necessary because
910 Ustrchr() yields non-NULL if the character is zero (which is not something
914 read_name(uschar *name, int max, uschar *s, uschar *extras)
917 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
919 if (ptr < max-1) name[ptr++] = *s;
928 /*************************************************
929 * Pick out the rest of a header name *
930 *************************************************/
932 /* A variable name starting $header_ (or just $h_ for those who like
933 abbreviations) might not be the complete header name because headers can
934 contain any printing characters in their names, except ':'. This function is
935 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
936 on the end, if the name was terminated by white space.
939 name points to a buffer in which the name read so far exists
940 max is the length of the buffer
941 s points to the first character after the name so far, i.e. the
942 first non-alphameric character after $header_xxxxx
944 Returns: a pointer to the first character after the header name
948 read_header_name(uschar *name, int max, uschar *s)
950 int prelen = Ustrchr(name, '_') - name + 1;
951 int ptr = Ustrlen(name) - prelen;
952 if (ptr > 0) memmove(name, name+prelen, ptr);
953 while (mac_isgraph(*s) && *s != ':')
955 if (ptr < max-1) name[ptr++] = *s;
966 /*************************************************
967 * Pick out a number from a string *
968 *************************************************/
971 n points to an integer into which to put the number
972 s points to the first digit of the number
974 Returns: a pointer to the character after the last digit
978 read_number(int *n, uschar *s)
981 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
987 /*************************************************
988 * Extract keyed subfield from a string *
989 *************************************************/
991 /* The yield is in dynamic store; NULL means that the key was not found.
994 key points to the name of the key
995 s points to the string from which to extract the subfield
997 Returns: NULL if the subfield was not found, or
998 a pointer to the subfield's data
1002 expand_getkeyed(uschar *key, uschar *s)
1004 int length = Ustrlen(key);
1005 while (isspace(*s)) s++;
1007 /* Loop to search for the key */
1015 while (*s != 0 && *s != '=' && !isspace(*s)) s++;
1016 dkeylength = s - dkey;
1017 while (isspace(*s)) s++;
1018 if (*s == '=') while (isspace((*(++s))));
1020 data = string_dequote(&s);
1021 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1024 while (isspace(*s)) s++;
1033 /*************************************************
1034 * Extract numbered subfield from string *
1035 *************************************************/
1037 /* Extracts a numbered field from a string that is divided by tokens - for
1038 example a line from /etc/passwd is divided by colon characters. First field is
1039 numbered one. Negative arguments count from the right. Zero returns the whole
1040 string. Returns NULL if there are insufficient tokens in the string
1043 Modifies final argument - this is a dynamically generated string, so that's OK.
1046 field number of field to be extracted,
1047 first field = 1, whole string = 0, last field = -1
1048 separators characters that are used to break string into tokens
1049 s points to the string from which to extract the subfield
1051 Returns: NULL if the field was not found,
1052 a pointer to the field's data inside s (modified to add 0)
1056 expand_gettokened (int field, uschar *separators, uschar *s)
1061 uschar *fieldtext = NULL;
1063 if (field == 0) return s;
1065 /* Break the line up into fields in place; for field > 0 we stop when we have
1066 done the number of fields we want. For field < 0 we continue till the end of
1067 the string, counting the number of fields. */
1069 count = (field > 0)? field : INT_MAX;
1075 /* Previous field was the last one in the string. For a positive field
1076 number, this means there are not enough fields. For a negative field number,
1077 check that there are enough, and scan back to find the one that is wanted. */
1081 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1082 if ((-field) == (INT_MAX - count - 1)) return s;
1086 while (ss[-1] != 0) ss--;
1092 /* Previous field was not last in the string; save its start and put a
1096 len = Ustrcspn(ss, separators);
1107 /*************************************************
1108 * Extract a substring from a string *
1109 *************************************************/
1111 /* Perform the ${substr or ${length expansion operations.
1114 subject the input string
1115 value1 the offset from the start of the input string to the start of
1116 the output string; if negative, count from the right.
1117 value2 the length of the output string, or negative (-1) for unset
1118 if value1 is positive, unset means "all after"
1119 if value1 is negative, unset means "all before"
1120 len set to the length of the returned string
1122 Returns: pointer to the output string, or NULL if there is an error
1126 extract_substr(uschar *subject, int value1, int value2, int *len)
1128 int sublen = Ustrlen(subject);
1130 if (value1 < 0) /* count from right */
1134 /* If the position is before the start, skip to the start, and adjust the
1135 length. If the length ends up negative, the substring is null because nothing
1136 can precede. This falls out naturally when the length is unset, meaning "all
1142 if (value2 < 0) value2 = 0;
1146 /* Otherwise an unset length => characters before value1 */
1148 else if (value2 < 0)
1155 /* For a non-negative offset, if the starting position is past the end of the
1156 string, the result will be the null string. Otherwise, an unset length means
1157 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1161 if (value1 > sublen)
1166 else if (value2 < 0) value2 = sublen;
1169 /* Cut the length down to the maximum possible for the offset value, and get
1170 the required characters. */
1172 if (value1 + value2 > sublen) value2 = sublen - value1;
1174 return subject + value1;
1180 /*************************************************
1181 * Old-style hash of a string *
1182 *************************************************/
1184 /* Perform the ${hash expansion operation.
1187 subject the input string (an expanded substring)
1188 value1 the length of the output string; if greater or equal to the
1189 length of the input string, the input string is returned
1190 value2 the number of hash characters to use, or 26 if negative
1191 len set to the length of the returned string
1193 Returns: pointer to the output string, or NULL if there is an error
1197 compute_hash(uschar *subject, int value1, int value2, int *len)
1199 int sublen = Ustrlen(subject);
1201 if (value2 < 0) value2 = 26;
1202 else if (value2 > Ustrlen(hashcodes))
1204 expand_string_message =
1205 string_sprintf("hash count \"%d\" too big", value2);
1209 /* Calculate the hash text. We know it is shorter than the original string, so
1210 can safely place it in subject[] (we know that subject is always itself an
1211 expanded substring). */
1213 if (value1 < sublen)
1218 while ((c = (subject[j])) != 0)
1220 int shift = (c + j++) & 7;
1221 subject[i] ^= (c << shift) | (c >> (8-shift));
1222 if (++i >= value1) i = 0;
1224 for (i = 0; i < value1; i++)
1225 subject[i] = hashcodes[(subject[i]) % value2];
1227 else value1 = sublen;
1236 /*************************************************
1237 * Numeric hash of a string *
1238 *************************************************/
1240 /* Perform the ${nhash expansion operation. The first characters of the
1241 string are treated as most important, and get the highest prime numbers.
1244 subject the input string
1245 value1 the maximum value of the first part of the result
1246 value2 the maximum value of the second part of the result,
1247 or negative to produce only a one-part result
1248 len set to the length of the returned string
1250 Returns: pointer to the output string, or NULL if there is an error.
1254 compute_nhash (uschar *subject, int value1, int value2, int *len)
1256 uschar *s = subject;
1258 unsigned long int total = 0; /* no overflow */
1262 if (i == 0) i = sizeof(prime)/sizeof(int) - 1;
1263 total += prime[i--] * (unsigned int)(*s++);
1266 /* If value2 is unset, just compute one number */
1270 s = string_sprintf("%d", total % value1);
1273 /* Otherwise do a div/mod hash */
1277 total = total % (value1 * value2);
1278 s = string_sprintf("%d/%d", total/value2, total % value2);
1289 /*************************************************
1290 * Find the value of a header or headers *
1291 *************************************************/
1293 /* Multiple instances of the same header get concatenated, and this function
1294 can also return a concatenation of all the header lines. When concatenating
1295 specific headers that contain lists of addresses, a comma is inserted between
1296 them. Otherwise we use a straight concatenation. Because some messages can have
1297 pathologically large number of lines, there is a limit on the length that is
1298 returned. Also, to avoid massive store use which would result from using
1299 string_cat() as it copies and extends strings, we do a preliminary pass to find
1300 out exactly how much store will be needed. On "normal" messages this will be
1304 name the name of the header, without the leading $header_ or $h_,
1305 or NULL if a concatenation of all headers is required
1306 exists_only TRUE if called from a def: test; don't need to build a string;
1307 just return a string that is not "" and not "0" if the header
1309 newsize return the size of memory block that was obtained; may be NULL
1310 if exists_only is TRUE
1311 want_raw TRUE if called for $rh_ or $rheader_ variables; no processing,
1312 other than concatenating, will be done on the header. Also used
1313 for $message_headers_raw.
1314 charset name of charset to translate MIME words to; used only if
1315 want_raw is false; if NULL, no translation is done (this is
1316 used for $bh_ and $bheader_)
1318 Returns: NULL if the header does not exist, else a pointer to a new
1323 find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw,
1326 BOOL found = name == NULL;
1328 int len = found? 0 : Ustrlen(name);
1330 uschar *yield = NULL;
1333 /* Loop for two passes - saves code repetition */
1335 for (i = 0; i < 2; i++)
1340 for (h = header_list; size < header_insert_maxlen && h != NULL; h = h->next)
1342 if (h->type != htype_old && h->text != NULL) /* NULL => Received: placeholder */
1344 if (name == NULL || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1349 if (exists_only) return US"1"; /* don't need actual string */
1351 t = h->text + len; /* text to insert */
1352 if (!want_raw) /* unless wanted raw, */
1353 while (isspace(*t)) t++; /* remove leading white space */
1354 ilen = h->slen - (t - h->text); /* length to insert */
1356 /* Unless wanted raw, remove trailing whitespace, including the
1360 while (ilen > 0 && isspace(t[ilen-1])) ilen--;
1362 /* Set comma = 1 if handling a single header and it's one of those
1363 that contains an address list, except when asked for raw headers. Only
1364 need to do this once. */
1366 if (!want_raw && name != NULL && comma == 0 &&
1367 Ustrchr("BCFRST", h->type) != NULL)
1370 /* First pass - compute total store needed; second pass - compute
1371 total store used, including this header. */
1373 size += ilen + comma + 1; /* +1 for the newline */
1375 /* Second pass - concatentate the data, up to a maximum. Note that
1376 the loop stops when size hits the limit. */
1380 if (size > header_insert_maxlen)
1382 ilen -= size - header_insert_maxlen - 1;
1385 Ustrncpy(ptr, t, ilen);
1388 /* For a non-raw header, put in the comma if needed, then add
1389 back the newline we removed above, provided there was some text in
1392 if (!want_raw && ilen > 0)
1394 if (comma != 0) *ptr++ = ',';
1402 /* At end of first pass, return NULL if no header found. Then truncate size
1403 if necessary, and get the buffer to hold the data, returning the buffer size.
1408 if (!found) return NULL;
1409 if (size > header_insert_maxlen) size = header_insert_maxlen;
1410 *newsize = size + 1;
1411 ptr = yield = store_get(*newsize);
1415 /* That's all we do for raw header expansion. */
1422 /* Otherwise, remove a final newline and a redundant added comma. Then we do
1423 RFC 2047 decoding, translating the charset if requested. The rfc2047_decode2()
1424 function can return an error with decoded data if the charset translation
1425 fails. If decoding fails, it returns NULL. */
1429 uschar *decoded, *error;
1430 if (ptr > yield && ptr[-1] == '\n') ptr--;
1431 if (ptr > yield && comma != 0 && ptr[-1] == ',') ptr--;
1433 decoded = rfc2047_decode2(yield, check_rfc2047_length, charset, '?', NULL,
1437 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1438 " input was: %s\n", error, yield);
1440 if (decoded != NULL) yield = decoded;
1449 /*************************************************
1450 * Find value of a variable *
1451 *************************************************/
1453 /* The table of variables is kept in alphabetic order, so we can search it
1454 using a binary chop. The "choplen" variable is nothing to do with the binary
1458 name the name of the variable being sought
1459 exists_only TRUE if this is a def: test; passed on to find_header()
1460 skipping TRUE => skip any processing evaluation; this is not the same as
1461 exists_only because def: may test for values that are first
1463 newsize pointer to an int which is initially zero; if the answer is in
1464 a new memory buffer, *newsize is set to its size
1466 Returns: NULL if the variable does not exist, or
1467 a pointer to the variable's contents, or
1468 something non-NULL if exists_only is TRUE
1472 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1475 int last = var_table_size;
1477 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1478 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1479 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1480 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1481 (this gave backwards compatibility at the changeover). There may be built-in
1482 variables whose names start acl_ but they should never start in this way. This
1483 slightly messy specification is a consequence of the history, needless to say.
1485 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1486 set, in which case give an error. */
1488 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1492 tree_search((name[4] == 'c')? acl_var_c : acl_var_m, name + 4);
1493 return (node == NULL)? (strict_acl_vars? NULL : US"") : node->data.ptr;
1496 /* Handle $auth<n> variables. */
1498 if (Ustrncmp(name, "auth", 4) == 0)
1501 int n = Ustrtoul(name + 4, &endptr, 10);
1502 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1503 return (auth_vars[n-1] == NULL)? US"" : auth_vars[n-1];
1506 /* For all other variables, search the table */
1508 while (last > first)
1512 int middle = (first + last)/2;
1513 int c = Ustrcmp(name, var_table[middle].name);
1515 if (c > 0) { first = middle + 1; continue; }
1516 if (c < 0) { last = middle; continue; }
1518 /* Found an existing variable. If in skipping state, the value isn't needed,
1519 and we want to avoid processing (such as looking up the host name). */
1521 if (skipping) return US"";
1523 switch (var_table[middle].type)
1525 case vtype_filter_int:
1526 if (!filter_running) return NULL;
1530 sprintf(CS var_buffer, "%d", *(int *)(var_table[middle].value)); /* Integer */
1534 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(var_table[middle].value))); /* Inode */
1538 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(var_table[middle].value))); /* gid */
1542 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(var_table[middle].value))); /* uid */
1546 sprintf(CS var_buffer, "%s", *(BOOL *)(var_table[middle].value) ? "yes" : "no"); /* bool */
1549 case vtype_stringptr: /* Pointer to string */
1550 s = *((uschar **)(var_table[middle].value));
1551 return (s == NULL)? US"" : s;
1554 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1557 case vtype_load_avg:
1558 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1561 case vtype_host_lookup: /* Lookup if not done so */
1562 if (sender_host_name == NULL && sender_host_address != NULL &&
1563 !host_lookup_failed && host_name_lookup() == OK)
1564 host_build_sender_fullhost();
1565 return (sender_host_name == NULL)? US"" : sender_host_name;
1567 case vtype_localpart: /* Get local part from address */
1568 s = *((uschar **)(var_table[middle].value));
1569 if (s == NULL) return US"";
1570 domain = Ustrrchr(s, '@');
1571 if (domain == NULL) return s;
1572 if (domain - s > sizeof(var_buffer) - 1)
1573 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1574 " in string expansion", sizeof(var_buffer));
1575 Ustrncpy(var_buffer, s, domain - s);
1576 var_buffer[domain - s] = 0;
1579 case vtype_domain: /* Get domain from address */
1580 s = *((uschar **)(var_table[middle].value));
1581 if (s == NULL) return US"";
1582 domain = Ustrrchr(s, '@');
1583 return (domain == NULL)? US"" : domain + 1;
1585 case vtype_msgheaders:
1586 return find_header(NULL, exists_only, newsize, FALSE, NULL);
1588 case vtype_msgheaders_raw:
1589 return find_header(NULL, exists_only, newsize, TRUE, NULL);
1591 case vtype_msgbody: /* Pointer to msgbody string */
1592 case vtype_msgbody_end: /* Ditto, the end of the msg */
1593 ss = (uschar **)(var_table[middle].value);
1594 if (*ss == NULL && deliver_datafile >= 0) /* Read body when needed */
1597 off_t start_offset = SPOOL_DATA_START_OFFSET;
1598 int len = message_body_visible;
1599 if (len > message_size) len = message_size;
1600 *ss = body = store_malloc(len+1);
1602 if (var_table[middle].type == vtype_msgbody_end)
1604 struct stat statbuf;
1605 if (fstat(deliver_datafile, &statbuf) == 0)
1607 start_offset = statbuf.st_size - len;
1608 if (start_offset < SPOOL_DATA_START_OFFSET)
1609 start_offset = SPOOL_DATA_START_OFFSET;
1612 lseek(deliver_datafile, start_offset, SEEK_SET);
1613 len = read(deliver_datafile, body, len);
1617 if (message_body_newlines) /* Separate loops for efficiency */
1620 { if (body[--len] == 0) body[len] = ' '; }
1625 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1629 return (*ss == NULL)? US"" : *ss;
1631 case vtype_todbsdin: /* BSD inbox time of day */
1632 return tod_stamp(tod_bsdin);
1634 case vtype_tode: /* Unix epoch time of day */
1635 return tod_stamp(tod_epoch);
1637 case vtype_todel: /* Unix epoch/usec time of day */
1638 return tod_stamp(tod_epoch_l);
1640 case vtype_todf: /* Full time of day */
1641 return tod_stamp(tod_full);
1643 case vtype_todl: /* Log format time of day */
1644 return tod_stamp(tod_log_bare); /* (without timezone) */
1646 case vtype_todzone: /* Time zone offset only */
1647 return tod_stamp(tod_zone);
1649 case vtype_todzulu: /* Zulu time */
1650 return tod_stamp(tod_zulu);
1652 case vtype_todlf: /* Log file datestamp tod */
1653 return tod_stamp(tod_log_datestamp_daily);
1655 case vtype_reply: /* Get reply address */
1656 s = find_header(US"reply-to:", exists_only, newsize, TRUE,
1658 if (s != NULL) while (isspace(*s)) s++;
1659 if (s == NULL || *s == 0)
1661 *newsize = 0; /* For the *s==0 case */
1662 s = find_header(US"from:", exists_only, newsize, TRUE, headers_charset);
1667 while (isspace(*s)) s++;
1668 for (t = s; *t != 0; t++) if (*t == '\n') *t = ' ';
1669 while (t > s && isspace(t[-1])) t--;
1672 return (s == NULL)? US"" : s;
1674 /* A recipients list is available only during system message filtering,
1675 during ACL processing after DATA, and while expanding pipe commands
1676 generated from a system filter, but not elsewhere. */
1678 case vtype_recipients:
1679 if (!enable_dollar_recipients) return NULL; else
1684 s = store_get(size);
1685 for (i = 0; i < recipients_count; i++)
1687 if (i != 0) s = string_cat(s, &size, &ptr, US", ", 2);
1688 s = string_cat(s, &size, &ptr, recipients_list[i].address,
1689 Ustrlen(recipients_list[i].address));
1691 s[ptr] = 0; /* string_cat() leaves room */
1698 sprintf(CS var_buffer, "%d",
1699 receive_statvfs(var_table[middle].value == (void *)TRUE, &inodes));
1706 (void) receive_statvfs(var_table[middle].value == (void *)TRUE, &inodes);
1707 sprintf(CS var_buffer, "%d", inodes);
1711 #ifndef DISABLE_DKIM
1713 return dkim_exim_expand_query((int)(long)var_table[middle].value);
1719 return NULL; /* Unknown variable name */
1726 modify_variable(uschar *name, void * value)
1729 int last = var_table_size;
1731 while (last > first)
1733 int middle = (first + last)/2;
1734 int c = Ustrcmp(name, var_table[middle].name);
1736 if (c > 0) { first = middle + 1; continue; }
1737 if (c < 0) { last = middle; continue; }
1739 /* Found an existing variable; change the item it refers to */
1740 var_table[middle].value = value;
1743 return; /* Unknown variable name, fail silently */
1750 /*************************************************
1751 * Read and expand substrings *
1752 *************************************************/
1754 /* This function is called to read and expand argument substrings for various
1755 expansion items. Some have a minimum requirement that is less than the maximum;
1756 in these cases, the first non-present one is set to NULL.
1759 sub points to vector of pointers to set
1760 n maximum number of substrings
1762 sptr points to current string pointer
1763 skipping the skipping flag
1764 check_end if TRUE, check for final '}'
1765 name name of item, for error message
1767 Returns: 0 OK; string pointer updated
1768 1 curly bracketing error (too few arguments)
1769 2 too many arguments (only if check_end is set); message set
1770 3 other error (expansion failure)
1774 read_subs(uschar **sub, int n, int m, uschar **sptr, BOOL skipping,
1775 BOOL check_end, uschar *name)
1780 while (isspace(*s)) s++;
1781 for (i = 0; i < n; i++)
1785 if (i < m) return 1;
1789 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
1790 if (sub[i] == NULL) return 3;
1791 if (*s++ != '}') return 1;
1792 while (isspace(*s)) s++;
1794 if (check_end && *s++ != '}')
1798 expand_string_message = string_sprintf("Too many arguments for \"%s\" "
1799 "(max is %d)", name, n);
1812 /*************************************************
1813 * Elaborate message for bad variable *
1814 *************************************************/
1816 /* For the "unknown variable" message, take a look at the variable's name, and
1817 give additional information about possible ACL variables. The extra information
1818 is added on to expand_string_message.
1820 Argument: the name of the variable
1825 check_variable_error_message(uschar *name)
1827 if (Ustrncmp(name, "acl_", 4) == 0)
1828 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
1829 (name[4] == 'c' || name[4] == 'm')?
1831 US"6th character of a user-defined ACL variable must be a digit or underscore" :
1832 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
1834 US"user-defined ACL variables must start acl_c or acl_m");
1840 Load args from sub array to globals, and call acl_check().
1842 Returns: OK access is granted by an ACCEPT verb
1843 DISCARD access is granted by a DISCARD verb
1844 FAIL access is denied
1845 FAIL_DROP access is denied; drop the connection
1846 DEFER can't tell at the moment
1850 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
1853 uschar *dummy_log_msg;
1855 for (i = 1; i < nsub && sub[i]; i++)
1856 acl_arg[i-1] = sub[i];
1858 while (i < sizeof(sub)/sizeof(*sub))
1859 acl_arg[i++ - 1] = NULL;
1862 debug_printf("expanding: acl: %s arg: %s%s\n",
1864 acl_narg>0 ? sub[1] : US"<none>",
1865 acl_narg>1 ? " +more" : "");
1867 return acl_check(ACL_WHERE_EXPANSION, NULL, sub[0], user_msgp, &dummy_log_msg);
1873 /*************************************************
1874 * Read and evaluate a condition *
1875 *************************************************/
1879 s points to the start of the condition text
1880 yield points to a BOOL to hold the result of the condition test;
1881 if NULL, we are just reading through a condition that is
1882 part of an "or" combination to check syntax, or in a state
1883 where the answer isn't required
1885 Returns: a pointer to the first character after the condition, or
1890 eval_condition(uschar *s, BOOL *yield)
1892 BOOL testfor = TRUE;
1893 BOOL tempcond, combined_cond;
1895 BOOL sub2_honour_dollar = TRUE;
1896 int i, rc, cond_type, roffset;
1897 int_eximarith_t num[2];
1898 struct stat statbuf;
1903 const uschar *rerror;
1907 while (isspace(*s)) s++;
1908 if (*s == '!') { testfor = !testfor; s++; } else break;
1911 /* Numeric comparisons are symbolic */
1913 if (*s == '=' || *s == '>' || *s == '<')
1925 /* All other conditions are named */
1927 else s = read_name(name, 256, s, US"_");
1929 /* If we haven't read a name, it means some non-alpha character is first. */
1933 expand_string_message = string_sprintf("condition name expected, "
1934 "but found \"%.16s\"", s);
1938 /* Find which condition we are dealing with, and switch on it */
1940 cond_type = chop_match(name, cond_table, sizeof(cond_table)/sizeof(uschar *));
1943 /* def: tests for a non-empty variable, or for the existence of a header. If
1944 yield == NULL we are in a skipping state, and don't care about the answer. */
1949 expand_string_message = US"\":\" expected after \"def\"";
1953 s = read_name(name, 256, s+1, US"_");
1955 /* Test for a header's existence. If the name contains a closing brace
1956 character, this may be a user error where the terminating colon has been
1957 omitted. Set a flag to adjust a subsequent error message in this case. */
1959 if (Ustrncmp(name, "h_", 2) == 0 ||
1960 Ustrncmp(name, "rh_", 3) == 0 ||
1961 Ustrncmp(name, "bh_", 3) == 0 ||
1962 Ustrncmp(name, "header_", 7) == 0 ||
1963 Ustrncmp(name, "rheader_", 8) == 0 ||
1964 Ustrncmp(name, "bheader_", 8) == 0)
1966 s = read_header_name(name, 256, s);
1967 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
1968 if (yield != NULL) *yield =
1969 (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor;
1972 /* Test for a variable's having a non-empty value. A non-existent variable
1973 causes an expansion failure. */
1977 uschar *value = find_variable(name, TRUE, yield == NULL, NULL);
1980 expand_string_message = (name[0] == 0)?
1981 string_sprintf("variable name omitted after \"def:\"") :
1982 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
1983 check_variable_error_message(name);
1986 if (yield != NULL) *yield = (value[0] != 0) == testfor;
1992 /* first_delivery tests for first delivery attempt */
1994 case ECOND_FIRST_DELIVERY:
1995 if (yield != NULL) *yield = deliver_firsttime == testfor;
1999 /* queue_running tests for any process started by a queue runner */
2001 case ECOND_QUEUE_RUNNING:
2002 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
2006 /* exists: tests for file existence
2007 isip: tests for any IP address
2008 isip4: tests for an IPv4 address
2009 isip6: tests for an IPv6 address
2010 pam: does PAM authentication
2011 radius: does RADIUS authentication
2012 ldapauth: does LDAP authentication
2013 pwcheck: does Cyrus SASL pwcheck authentication
2022 case ECOND_LDAPAUTH:
2025 while (isspace(*s)) s++;
2026 if (*s != '{') goto COND_FAILED_CURLY_START;
2028 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE);
2029 if (sub[0] == NULL) return NULL;
2030 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2032 if (yield == NULL) return s; /* No need to run the test if skipping */
2037 if ((expand_forbid & RDO_EXISTS) != 0)
2039 expand_string_message = US"File existence tests are not permitted";
2042 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2048 rc = string_is_ip_address(sub[0], NULL);
2049 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2050 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2053 /* Various authentication tests - all optionally compiled */
2057 rc = auth_call_pam(sub[0], &expand_string_message);
2060 goto COND_FAILED_NOT_COMPILED;
2061 #endif /* SUPPORT_PAM */
2064 #ifdef RADIUS_CONFIG_FILE
2065 rc = auth_call_radius(sub[0], &expand_string_message);
2068 goto COND_FAILED_NOT_COMPILED;
2069 #endif /* RADIUS_CONFIG_FILE */
2071 case ECOND_LDAPAUTH:
2074 /* Just to keep the interface the same */
2076 int old_pool = store_pool;
2077 store_pool = POOL_SEARCH;
2078 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2079 &expand_string_message, &do_cache);
2080 store_pool = old_pool;
2084 goto COND_FAILED_NOT_COMPILED;
2085 #endif /* LOOKUP_LDAP */
2088 #ifdef CYRUS_PWCHECK_SOCKET
2089 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2092 goto COND_FAILED_NOT_COMPILED;
2093 #endif /* CYRUS_PWCHECK_SOCKET */
2095 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2096 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2098 if (rc == ERROR || rc == DEFER) return NULL;
2099 *yield = (rc == OK) == testfor;
2105 /* call ACL (in a conditional context). Accept true, deny false.
2106 Defer is a forced-fail. Anything set by message= goes to $value.
2107 Up to ten parameters are used; we use the braces round the name+args
2108 like the saslauthd condition does, to permit a variable number of args.
2109 See also the expansion-item version EITEM_ACL and the traditional
2110 acl modifier ACLC_ACL.
2114 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}}
2120 while (isspace(*s)) s++;
2121 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2123 switch(read_subs(sub, sizeof(sub)/sizeof(*sub), 1,
2124 &s, yield == NULL, TRUE, US"acl"))
2126 case 1: expand_string_message = US"too few arguments or bracketing "
2129 case 3: return NULL;
2133 switch(eval_acl(sub, sizeof(sub)/sizeof(*sub), &user_msg))
2139 lookup_value = string_cat(NULL, &size, &ptr, user_msg, Ustrlen(user_msg));
2141 lookup_value = NULL;
2146 expand_string_forcedfail = TRUE;
2148 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
2155 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2157 ${if saslauthd {{username}{password}{service}{realm}} {yes}[no}}
2159 However, the last two are optional. That is why the whole set is enclosed
2160 in their own set of braces. */
2162 case ECOND_SASLAUTHD:
2163 #ifndef CYRUS_SASLAUTHD_SOCKET
2164 goto COND_FAILED_NOT_COMPILED;
2166 while (isspace(*s)) s++;
2167 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2168 switch(read_subs(sub, 4, 2, &s, yield == NULL, TRUE, US"saslauthd"))
2170 case 1: expand_string_message = US"too few arguments or bracketing "
2171 "error for saslauthd";
2173 case 3: return NULL;
2175 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
2179 rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2180 &expand_string_message);
2181 if (rc == ERROR || rc == DEFER) return NULL;
2182 *yield = (rc == OK) == testfor;
2185 #endif /* CYRUS_SASLAUTHD_SOCKET */
2188 /* symbolic operators for numeric and string comparison, and a number of
2189 other operators, all requiring two arguments.
2191 crypteq: encrypts plaintext and compares against an encrypted text,
2192 using crypt(), crypt16(), MD5 or SHA-1
2193 inlist/inlisti: checks if first argument is in the list of the second
2194 match: does a regular expression match and sets up the numerical
2195 variables if it succeeds
2196 match_address: matches in an address list
2197 match_domain: matches in a domain list
2198 match_ip: matches a host list that is restricted to IP addresses
2199 match_local_part: matches in a local part list
2202 case ECOND_MATCH_ADDRESS:
2203 case ECOND_MATCH_DOMAIN:
2204 case ECOND_MATCH_IP:
2205 case ECOND_MATCH_LOCAL_PART:
2206 #ifndef EXPAND_LISTMATCH_RHS
2207 sub2_honour_dollar = FALSE;
2216 case ECOND_NUM_L: /* Numerical comparisons */
2223 case ECOND_STR_LT: /* String comparisons */
2234 for (i = 0; i < 2; i++)
2236 /* Sometimes, we don't expand substrings; too many insecure configurations
2237 created using match_address{}{} and friends, where the second param
2238 includes information from untrustworthy sources. */
2239 BOOL honour_dollar = TRUE;
2240 if ((i > 0) && !sub2_honour_dollar)
2241 honour_dollar = FALSE;
2243 while (isspace(*s)) s++;
2246 if (i == 0) goto COND_FAILED_CURLY_START;
2247 expand_string_message = string_sprintf("missing 2nd string in {} "
2248 "after \"%s\"", name);
2251 sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2253 if (sub[i] == NULL) return NULL;
2254 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2256 /* Convert to numerical if required; we know that the names of all the
2257 conditions that compare numbers do not start with a letter. This just saves
2258 checking for them individually. */
2260 if (!isalpha(name[0]) && yield != NULL)
2266 debug_printf("empty string cast to zero for numerical comparison\n");
2270 num[i] = expand_string_integer(sub[i], FALSE);
2271 if (expand_string_message != NULL) return NULL;
2276 /* Result not required */
2278 if (yield == NULL) return s;
2280 /* Do an appropriate comparison */
2286 *yield = (num[0] == num[1]) == testfor;
2290 *yield = (num[0] > num[1]) == testfor;
2294 *yield = (num[0] >= num[1]) == testfor;
2298 *yield = (num[0] < num[1]) == testfor;
2302 *yield = (num[0] <= num[1]) == testfor;
2306 *yield = (Ustrcmp(sub[0], sub[1]) < 0) == testfor;
2310 *yield = (strcmpic(sub[0], sub[1]) < 0) == testfor;
2314 *yield = (Ustrcmp(sub[0], sub[1]) <= 0) == testfor;
2318 *yield = (strcmpic(sub[0], sub[1]) <= 0) == testfor;
2322 *yield = (Ustrcmp(sub[0], sub[1]) == 0) == testfor;
2326 *yield = (strcmpic(sub[0], sub[1]) == 0) == testfor;
2330 *yield = (Ustrcmp(sub[0], sub[1]) > 0) == testfor;
2334 *yield = (strcmpic(sub[0], sub[1]) > 0) == testfor;
2338 *yield = (Ustrcmp(sub[0], sub[1]) >= 0) == testfor;
2342 *yield = (strcmpic(sub[0], sub[1]) >= 0) == testfor;
2345 case ECOND_MATCH: /* Regular expression match */
2346 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
2350 expand_string_message = string_sprintf("regular expression error in "
2351 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2354 *yield = regex_match_and_setup(re, sub[0], 0, -1) == testfor;
2357 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2358 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2359 goto MATCHED_SOMETHING;
2361 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2362 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2363 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2364 goto MATCHED_SOMETHING;
2366 case ECOND_MATCH_IP: /* Match IP address in a host list */
2367 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2369 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2375 unsigned int *nullcache = NULL;
2376 check_host_block cb;
2378 cb.host_name = US"";
2379 cb.host_address = sub[0];
2381 /* If the host address starts off ::ffff: it is an IPv6 address in
2382 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2385 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2386 cb.host_address + 7 : cb.host_address;
2388 rc = match_check_list(
2389 &sub[1], /* the list */
2390 0, /* separator character */
2391 &hostlist_anchor, /* anchor pointer */
2392 &nullcache, /* cache pointer */
2393 check_host, /* function for testing */
2394 &cb, /* argument for function */
2395 MCL_HOST, /* type of check */
2396 sub[0], /* text for debugging */
2397 NULL); /* where to pass back data */
2399 goto MATCHED_SOMETHING;
2401 case ECOND_MATCH_LOCAL_PART:
2402 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2403 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
2418 expand_string_message = string_sprintf("unable to complete match "
2419 "against \"%s\": %s", sub[1], search_error_message);
2425 /* Various "encrypted" comparisons. If the second string starts with
2426 "{" then an encryption type is given. Default to crypt() or crypt16()
2427 (build-time choice). */
2430 #ifndef SUPPORT_CRYPTEQ
2431 goto COND_FAILED_NOT_COMPILED;
2433 if (strncmpic(sub[1], US"{md5}", 5) == 0)
2435 int sublen = Ustrlen(sub[1]+5);
2440 md5_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
2442 /* If the length that we are comparing against is 24, the MD5 digest
2443 is expressed as a base64 string. This is the way LDAP does it. However,
2444 some other software uses a straightforward hex representation. We assume
2445 this if the length is 32. Other lengths fail. */
2449 uschar *coded = auth_b64encode((uschar *)digest, 16);
2450 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
2451 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2452 *yield = (Ustrcmp(coded, sub[1]+5) == 0) == testfor;
2454 else if (sublen == 32)
2458 for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2460 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
2461 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2462 *yield = (strcmpic(coded, sub[1]+5) == 0) == testfor;
2466 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
2467 "fail\n crypted=%s\n", sub[1]+5);
2472 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
2474 int sublen = Ustrlen(sub[1]+6);
2479 sha1_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
2481 /* If the length that we are comparing against is 28, assume the SHA1
2482 digest is expressed as a base64 string. If the length is 40, assume a
2483 straightforward hex representation. Other lengths fail. */
2487 uschar *coded = auth_b64encode((uschar *)digest, 20);
2488 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
2489 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2490 *yield = (Ustrcmp(coded, sub[1]+6) == 0) == testfor;
2492 else if (sublen == 40)
2496 for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2498 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
2499 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2500 *yield = (strcmpic(coded, sub[1]+6) == 0) == testfor;
2504 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
2505 "fail\n crypted=%s\n", sub[1]+6);
2510 else /* {crypt} or {crypt16} and non-{ at start */
2511 /* }-for-text-editors */
2516 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2521 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2526 else if (sub[1][0] == '{')
2528 expand_string_message = string_sprintf("unknown encryption mechanism "
2529 "in \"%s\"", sub[1]);
2535 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2536 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2537 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2541 #define XSTR(s) STR(s)
2542 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2543 " subject=%s\n crypted=%s\n",
2544 (which == 0)? XSTR(DEFAULT_CRYPT) : (which == 1)? "crypt" : "crypt16",
2549 /* If the encrypted string contains fewer than two characters (for the
2550 salt), force failure. Otherwise we get false positives: with an empty
2551 string the yield of crypt() is an empty string! */
2553 *yield = (Ustrlen(sub[1]) < 2)? !testfor :
2554 (Ustrcmp(coded, sub[1]) == 0) == testfor;
2557 #endif /* SUPPORT_CRYPTEQ */
2564 uschar *save_iterate_item = iterate_item;
2565 int (*compare)(const uschar *, const uschar *);
2567 if (cond_type == ECOND_INLISTI)
2570 compare = (int (*)(const uschar *, const uschar *)) strcmp;
2572 while ((iterate_item = string_nextinlist(&sub[1], &sep, NULL, 0)) != NULL)
2573 if (compare(sub[0], iterate_item) == 0)
2578 iterate_item = save_iterate_item;
2582 } /* Switch for comparison conditions */
2584 return s; /* End of comparison conditions */
2587 /* and/or: computes logical and/or of several conditions */
2591 subcondptr = (yield == NULL)? NULL : &tempcond;
2592 combined_cond = (cond_type == ECOND_AND);
2594 while (isspace(*s)) s++;
2595 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2599 while (isspace(*s)) s++;
2600 if (*s == '}') break;
2603 expand_string_message = string_sprintf("each subcondition "
2604 "inside an \"%s{...}\" condition must be in its own {}", name);
2608 s = eval_condition(s+1, subcondptr);
2611 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
2612 expand_string_message, name);
2615 while (isspace(*s)) s++;
2619 expand_string_message = string_sprintf("missing } at end of condition "
2620 "inside \"%s\" group", name);
2626 if (cond_type == ECOND_AND)
2628 combined_cond &= tempcond;
2629 if (!combined_cond) subcondptr = NULL; /* once false, don't */
2630 } /* evaluate any more */
2633 combined_cond |= tempcond;
2634 if (combined_cond) subcondptr = NULL; /* once true, don't */
2635 } /* evaluate any more */
2639 if (yield != NULL) *yield = (combined_cond == testfor);
2643 /* forall/forany: iterates a condition with different values */
2649 uschar *save_iterate_item = iterate_item;
2651 while (isspace(*s)) s++;
2652 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2653 sub[0] = expand_string_internal(s, TRUE, &s, (yield == NULL), TRUE);
2654 if (sub[0] == NULL) return NULL;
2655 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2657 while (isspace(*s)) s++;
2658 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2662 /* Call eval_condition once, with result discarded (as if scanning a
2663 "false" part). This allows us to find the end of the condition, because if
2664 the list it empty, we won't actually evaluate the condition for real. */
2666 s = eval_condition(sub[1], NULL);
2669 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2670 expand_string_message, name);
2673 while (isspace(*s)) s++;
2677 expand_string_message = string_sprintf("missing } at end of condition "
2678 "inside \"%s\"", name);
2682 if (yield != NULL) *yield = !testfor;
2683 while ((iterate_item = string_nextinlist(&sub[0], &sep, NULL, 0)) != NULL)
2685 DEBUG(D_expand) debug_printf("%s: $item = \"%s\"\n", name, iterate_item);
2686 if (eval_condition(sub[1], &tempcond) == NULL)
2688 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2689 expand_string_message, name);
2690 iterate_item = save_iterate_item;
2693 DEBUG(D_expand) debug_printf("%s: condition evaluated to %s\n", name,
2694 tempcond? "true":"false");
2696 if (yield != NULL) *yield = (tempcond == testfor);
2697 if (tempcond == (cond_type == ECOND_FORANY)) break;
2700 iterate_item = save_iterate_item;
2705 /* The bool{} expansion condition maps a string to boolean.
2706 The values supported should match those supported by the ACL condition
2707 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
2708 of true/false. Note that Router "condition" rules have a different
2709 interpretation, where general data can be used and only a few values
2711 Note that readconf.c boolean matching, for boolean configuration options,
2712 only matches true/yes/false/no.
2713 The bool_lax{} condition matches the Router logic, which is much more
2716 case ECOND_BOOL_LAX:
2722 BOOL boolvalue = FALSE;
2723 while (isspace(*s)) s++;
2724 if (*s != '{') goto COND_FAILED_CURLY_START;
2725 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
2726 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname))
2728 case 1: expand_string_message = string_sprintf(
2729 "too few arguments or bracketing error for %s",
2733 case 3: return NULL;
2736 while (isspace(*t)) t++;
2740 /* trailing whitespace: seems like a good idea to ignore it too */
2742 while (isspace(*t2)) t2--;
2743 if (t2 != (t + len))
2750 debug_printf("considering %s: %s\n", ourname, len ? t : US"<empty>");
2751 /* logic for the lax case from expand_check_condition(), which also does
2752 expands, and the logic is both short and stable enough that there should
2753 be no maintenance burden from replicating it. */
2756 else if (Ustrspn(t, "0123456789") == len)
2758 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
2759 /* expand_check_condition only does a literal string "0" check */
2760 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
2763 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
2765 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
2767 else if (cond_type == ECOND_BOOL_LAX)
2771 expand_string_message = string_sprintf("unrecognised boolean "
2775 if (yield != NULL) *yield = (boolvalue == testfor);
2779 /* Unknown condition */
2782 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
2784 } /* End switch on condition type */
2786 /* Missing braces at start and end of data */
2788 COND_FAILED_CURLY_START:
2789 expand_string_message = string_sprintf("missing { after \"%s\"", name);
2792 COND_FAILED_CURLY_END:
2793 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
2797 /* A condition requires code that is not compiled */
2799 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
2800 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
2801 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
2802 COND_FAILED_NOT_COMPILED:
2803 expand_string_message = string_sprintf("support for \"%s\" not compiled",
2812 /*************************************************
2813 * Save numerical variables *
2814 *************************************************/
2816 /* This function is called from items such as "if" that want to preserve and
2817 restore the numbered variables.
2820 save_expand_string points to an array of pointers to set
2821 save_expand_nlength points to an array of ints for the lengths
2823 Returns: the value of expand max to save
2827 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
2830 for (i = 0; i <= expand_nmax; i++)
2832 save_expand_nstring[i] = expand_nstring[i];
2833 save_expand_nlength[i] = expand_nlength[i];
2840 /*************************************************
2841 * Restore numerical variables *
2842 *************************************************/
2844 /* This function restored saved values of numerical strings.
2847 save_expand_nmax the number of strings to restore
2848 save_expand_string points to an array of pointers
2849 save_expand_nlength points to an array of ints
2855 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
2856 int *save_expand_nlength)
2859 expand_nmax = save_expand_nmax;
2860 for (i = 0; i <= expand_nmax; i++)
2862 expand_nstring[i] = save_expand_nstring[i];
2863 expand_nlength[i] = save_expand_nlength[i];
2871 /*************************************************
2872 * Handle yes/no substrings *
2873 *************************************************/
2875 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
2876 alternative substrings that depend on whether or not the condition was true,
2877 or the lookup or extraction succeeded. The substrings always have to be
2878 expanded, to check their syntax, but "skipping" is set when the result is not
2879 needed - this avoids unnecessary nested lookups.
2882 skipping TRUE if we were skipping when this item was reached
2883 yes TRUE if the first string is to be used, else use the second
2884 save_lookup a value to put back into lookup_value before the 2nd expansion
2885 sptr points to the input string pointer
2886 yieldptr points to the output string pointer
2887 sizeptr points to the output string size
2888 ptrptr points to the output string pointer
2889 type "lookup" or "if" or "extract" or "run", for error message
2891 Returns: 0 OK; lookup_value has been reset to save_lookup
2893 2 expansion failed because of bracketing error
2897 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, uschar **sptr,
2898 uschar **yieldptr, int *sizeptr, int *ptrptr, uschar *type)
2901 uschar *s = *sptr; /* Local value */
2902 uschar *sub1, *sub2;
2904 /* If there are no following strings, we substitute the contents of $value for
2905 lookups and for extractions in the success case. For the ${if item, the string
2906 "true" is substituted. In the fail case, nothing is substituted for all three
2909 while (isspace(*s)) s++;
2914 if (yes) *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, US"true", 4);
2918 if (yes && lookup_value != NULL)
2919 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, lookup_value,
2920 Ustrlen(lookup_value));
2921 lookup_value = save_lookup;
2927 /* The first following string must be braced. */
2929 if (*s++ != '{') goto FAILED_CURLY;
2931 /* Expand the first substring. Forced failures are noticed only if we actually
2932 want this string. Set skipping in the call in the fail case (this will always
2933 be the case if we were already skipping). */
2935 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE);
2936 if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED;
2937 expand_string_forcedfail = FALSE;
2938 if (*s++ != '}') goto FAILED_CURLY;
2940 /* If we want the first string, add it to the output */
2943 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub1, Ustrlen(sub1));
2945 /* If this is called from a lookup or an extract, we want to restore $value to
2946 what it was at the start of the item, so that it has this value during the
2947 second string expansion. For the call from "if" or "run" to this function,
2948 save_lookup is set to lookup_value, so that this statement does nothing. */
2950 lookup_value = save_lookup;
2952 /* There now follows either another substring, or "fail", or nothing. This
2953 time, forced failures are noticed only if we want the second string. We must
2954 set skipping in the nested call if we don't want this string, or if we were
2955 already skipping. */
2957 while (isspace(*s)) s++;
2960 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE);
2961 if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED;
2962 expand_string_forcedfail = FALSE;
2963 if (*s++ != '}') goto FAILED_CURLY;
2965 /* If we want the second string, add it to the output */
2968 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub2, Ustrlen(sub2));
2971 /* If there is no second string, but the word "fail" is present when the use of
2972 the second string is wanted, set a flag indicating it was a forced failure
2973 rather than a syntactic error. Swallow the terminating } in case this is nested
2974 inside another lookup or if or extract. */
2979 s = read_name(name, sizeof(name), s, US"_");
2980 if (Ustrcmp(name, "fail") == 0)
2982 if (!yes && !skipping)
2984 while (isspace(*s)) s++;
2985 if (*s++ != '}') goto FAILED_CURLY;
2986 expand_string_message =
2987 string_sprintf("\"%s\" failed and \"fail\" requested", type);
2988 expand_string_forcedfail = TRUE;
2994 expand_string_message =
2995 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3000 /* All we have to do now is to check on the final closing brace. */
3002 while (isspace(*s)) s++;
3003 if (*s++ == '}') goto RETURN;
3005 /* Get here if there is a bracketing failure */
3010 /* Get here for other failures */
3015 /* Update the input pointer value before returning */
3025 /*************************************************
3026 * Handle MD5 or SHA-1 computation for HMAC *
3027 *************************************************/
3029 /* These are some wrapping functions that enable the HMAC code to be a bit
3030 cleaner. A good compiler will spot the tail recursion.
3033 type HMAC_MD5 or HMAC_SHA1
3034 remaining are as for the cryptographic hash functions
3040 chash_start(int type, void *base)
3042 if (type == HMAC_MD5)
3043 md5_start((md5 *)base);
3045 sha1_start((sha1 *)base);
3049 chash_mid(int type, void *base, uschar *string)
3051 if (type == HMAC_MD5)
3052 md5_mid((md5 *)base, string);
3054 sha1_mid((sha1 *)base, string);
3058 chash_end(int type, void *base, uschar *string, int length, uschar *digest)
3060 if (type == HMAC_MD5)
3061 md5_end((md5 *)base, string, length, digest);
3063 sha1_end((sha1 *)base, string, length, digest);
3070 /********************************************************
3071 * prvs: Get last three digits of days since Jan 1, 1970 *
3072 ********************************************************/
3074 /* This is needed to implement the "prvs" BATV reverse
3077 Argument: integer "days" offset to add or substract to
3078 or from the current number of days.
3080 Returns: pointer to string containing the last three
3081 digits of the number of days since Jan 1, 1970,
3082 modified by the offset argument, NULL if there
3083 was an error in the conversion.
3088 prvs_daystamp(int day_offset)
3090 uschar *days = store_get(32); /* Need at least 24 for cases */
3091 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3092 (time(NULL) + day_offset*86400)/86400);
3093 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3098 /********************************************************
3099 * prvs: perform HMAC-SHA1 computation of prvs bits *
3100 ********************************************************/
3102 /* This is needed to implement the "prvs" BATV reverse
3106 address RFC2821 Address to use
3107 key The key to use (must be less than 64 characters
3109 key_num Single-digit key number to use. Defaults to
3112 Returns: pointer to string containing the first three
3113 bytes of the final hash in hex format, NULL if
3114 there was an error in the process.
3118 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3120 uschar *hash_source, *p;
3121 int size = 0,offset = 0,i;
3123 void *use_base = &sha1_base;
3124 uschar innerhash[20];
3125 uschar finalhash[20];
3126 uschar innerkey[64];
3127 uschar outerkey[64];
3128 uschar *finalhash_hex = store_get(40);
3130 if (key_num == NULL)
3133 if (Ustrlen(key) > 64)
3136 hash_source = string_cat(NULL,&size,&offset,key_num,1);
3137 string_cat(hash_source,&size,&offset,daystamp,3);
3138 string_cat(hash_source,&size,&offset,address,Ustrlen(address));
3139 hash_source[offset] = '\0';
3141 DEBUG(D_expand) debug_printf("prvs: hash source is '%s'\n", hash_source);
3143 memset(innerkey, 0x36, 64);
3144 memset(outerkey, 0x5c, 64);
3146 for (i = 0; i < Ustrlen(key); i++)
3148 innerkey[i] ^= key[i];
3149 outerkey[i] ^= key[i];
3152 chash_start(HMAC_SHA1, use_base);
3153 chash_mid(HMAC_SHA1, use_base, innerkey);
3154 chash_end(HMAC_SHA1, use_base, hash_source, offset, innerhash);
3156 chash_start(HMAC_SHA1, use_base);
3157 chash_mid(HMAC_SHA1, use_base, outerkey);
3158 chash_end(HMAC_SHA1, use_base, innerhash, 20, finalhash);
3161 for (i = 0; i < 3; i++)
3163 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3164 *p++ = hex_digits[finalhash[i] & 0x0f];
3168 return finalhash_hex;
3174 /*************************************************
3175 * Join a file onto the output string *
3176 *************************************************/
3178 /* This is used for readfile and after a run expansion. It joins the contents
3179 of a file onto the output string, globally replacing newlines with a given
3180 string (optionally). The file is closed at the end.
3184 yield pointer to the expandable string
3185 sizep pointer to the current size
3186 ptrp pointer to the current position
3187 eol newline replacement string, or NULL
3189 Returns: new value of string pointer
3193 cat_file(FILE *f, uschar *yield, int *sizep, int *ptrp, uschar *eol)
3196 uschar buffer[1024];
3198 eollen = (eol == NULL)? 0 : Ustrlen(eol);
3200 while (Ufgets(buffer, sizeof(buffer), f) != NULL)
3202 int len = Ustrlen(buffer);
3203 if (eol != NULL && buffer[len-1] == '\n') len--;
3204 yield = string_cat(yield, sizep, ptrp, buffer, len);
3205 if (buffer[len] != 0)
3206 yield = string_cat(yield, sizep, ptrp, eol, eollen);
3209 if (yield != NULL) yield[*ptrp] = 0;
3217 /*************************************************
3218 * Evaluate numeric expression *
3219 *************************************************/
3221 /* This is a set of mutually recursive functions that evaluate an arithmetic
3222 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3223 these functions that is called from elsewhere is eval_expr, whose interface is:
3226 sptr pointer to the pointer to the string - gets updated
3227 decimal TRUE if numbers are to be assumed decimal
3228 error pointer to where to put an error message - must be NULL on input
3229 endket TRUE if ')' must terminate - FALSE for external call
3231 Returns: on success: the value of the expression, with *error still NULL
3232 on failure: an undefined value, with *error = a message
3235 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
3238 static int_eximarith_t
3239 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
3242 int_eximarith_t x = eval_op_or(&s, decimal, error);
3248 *error = US"expecting closing parenthesis";
3250 while (isspace(*(++s)));
3252 else if (*s != 0) *error = US"expecting operator";
3259 static int_eximarith_t
3260 eval_number(uschar **sptr, BOOL decimal, uschar **error)
3265 while (isspace(*s)) s++;
3270 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
3272 switch (tolower(*s))
3275 case 'k': n *= 1024; s++; break;
3276 case 'm': n *= 1024*1024; s++; break;
3277 case 'g': n *= 1024*1024*1024; s++; break;
3279 while (isspace (*s)) s++;
3284 n = eval_expr(&s, decimal, error, 1);
3288 *error = US"expecting number or opening parenthesis";
3296 static int_eximarith_t
3297 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
3301 while (isspace(*s)) s++;
3302 if (*s == '+' || *s == '-' || *s == '~')
3305 x = eval_op_unary(&s, decimal, error);
3306 if (op == '-') x = -x;
3307 else if (op == '~') x = ~x;
3311 x = eval_number(&s, decimal, error);
3318 static int_eximarith_t
3319 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
3322 int_eximarith_t x = eval_op_unary(&s, decimal, error);
3325 while (*s == '*' || *s == '/' || *s == '%')
3328 int_eximarith_t y = eval_op_unary(&s, decimal, error);
3329 if (*error != NULL) break;
3330 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
3331 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
3332 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
3333 * -N*M is INT_MIN will yielf INT_MIN.
3334 * Since we don't support floating point, this is somewhat simpler.
3335 * Ideally, we'd return an error, but since we overflow for all other
3336 * arithmetic, consistency suggests otherwise, but what's the correct value
3337 * to use? There is none.
3338 * The C standard guarantees overflow for unsigned arithmetic but signed
3339 * overflow invokes undefined behaviour; in practice, this is overflow
3340 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
3341 * that long/longlong larger than int are available, or we could just work
3342 * with larger types. We should consider whether to guarantee 32bit eval
3343 * and 64-bit working variables, with errors returned. For now ...
3344 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
3345 * can just let the other invalid results occur otherwise, as they have
3346 * until now. For this one case, we can coerce.
3348 if (y == -1 && x == LLONG_MIN && op != '*')
3351 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
3352 LLONG_MIN, op, LLONG_MAX);
3362 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
3378 static int_eximarith_t
3379 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
3382 int_eximarith_t x = eval_op_mult(&s, decimal, error);
3385 while (*s == '+' || *s == '-')
3388 int_eximarith_t y = eval_op_mult(&s, decimal, error);
3389 if (*error != NULL) break;
3390 if (op == '+') x += y; else x -= y;
3398 static int_eximarith_t
3399 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
3402 int_eximarith_t x = eval_op_sum(&s, decimal, error);
3405 while ((*s == '<' || *s == '>') && s[1] == s[0])
3410 y = eval_op_sum(&s, decimal, error);
3411 if (*error != NULL) break;
3412 if (op == '<') x <<= y; else x >>= y;
3420 static int_eximarith_t
3421 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
3424 int_eximarith_t x = eval_op_shift(&s, decimal, error);
3431 y = eval_op_shift(&s, decimal, error);
3432 if (*error != NULL) break;
3441 static int_eximarith_t
3442 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
3445 int_eximarith_t x = eval_op_and(&s, decimal, error);
3452 y = eval_op_and(&s, decimal, error);
3453 if (*error != NULL) break;
3462 static int_eximarith_t
3463 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
3466 int_eximarith_t x = eval_op_xor(&s, decimal, error);
3473 y = eval_op_xor(&s, decimal, error);
3474 if (*error != NULL) break;
3484 /*************************************************
3486 *************************************************/
3488 /* Returns either an unchanged string, or the expanded string in stacking pool
3489 store. Interpreted sequences are:
3491 \... normal escaping rules
3492 $name substitutes the variable
3494 ${op:string} operates on the expanded string value
3495 ${item{arg1}{arg2}...} expands the args and then does the business
3496 some literal args are not enclosed in {}
3498 There are now far too many operators and item types to make it worth listing
3499 them here in detail any more.
3501 We use an internal routine recursively to handle embedded substrings. The
3502 external function follows. The yield is NULL if the expansion failed, and there
3503 are two cases: if something collapsed syntactically, or if "fail" was given
3504 as the action on a lookup failure. These can be distinguised by looking at the
3505 variable expand_string_forcedfail, which is TRUE in the latter case.
3507 The skipping flag is set true when expanding a substring that isn't actually
3508 going to be used (after "if" or "lookup") and it prevents lookups from
3509 happening lower down.
3511 Store usage: At start, a store block of the length of the input plus 64
3512 is obtained. This is expanded as necessary by string_cat(), which might have to
3513 get a new block, or might be able to expand the original. At the end of the
3514 function we can release any store above that portion of the yield block that
3515 was actually used. In many cases this will be optimal.
3517 However: if the first item in the expansion is a variable name or header name,
3518 we reset the store before processing it; if the result is in fresh store, we
3519 use that without copying. This is helpful for expanding strings like
3520 $message_headers which can get very long.
3522 There's a problem if a ${dlfunc item has side-effects that cause allocation,
3523 since resetting the store at the end of the expansion will free store that was
3524 allocated by the plugin code as well as the slop after the expanded string. So
3525 we skip any resets if ${dlfunc has been used. This is an unfortunate
3526 consequence of string expansion becoming too powerful.
3529 string the string to be expanded
3530 ket_ends true if expansion is to stop at }
3531 left if not NULL, a pointer to the first character after the
3532 expansion is placed here (typically used with ket_ends)
3533 skipping TRUE for recursive calls when the value isn't actually going
3534 to be used (to allow for optimisation)
3535 honour_dollar TRUE if $ is to be expanded,
3536 FALSE if it's just another character
3538 Returns: NULL if expansion fails:
3539 expand_string_forcedfail is set TRUE if failure was forced
3540 expand_string_message contains a textual error message
3541 a pointer to the expanded string on success
3545 expand_string_internal(uschar *string, BOOL ket_ends, uschar **left,
3546 BOOL skipping, BOOL honour_dollar)
3549 int size = Ustrlen(string)+ 64;
3551 uschar *yield = store_get(size);
3553 uschar *save_expand_nstring[EXPAND_MAXN+1];
3554 int save_expand_nlength[EXPAND_MAXN+1];
3555 BOOL resetok = TRUE;
3557 expand_string_forcedfail = FALSE;
3558 expand_string_message = US"";
3565 /* \ escapes the next character, which must exist, or else
3566 the expansion fails. There's a special escape, \N, which causes
3567 copying of the subject verbatim up to the next \N. Otherwise,
3568 the escapes are the standard set. */
3574 expand_string_message = US"\\ at end of string";
3581 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
3582 yield = string_cat(yield, &size, &ptr, t, s - t);
3583 if (*s != 0) s += 2;
3589 ch[0] = string_interpret_escape(&s);
3591 yield = string_cat(yield, &size, &ptr, ch, 1);
3597 /* Anything other than $ is just copied verbatim, unless we are
3598 looking for a terminating } character. */
3600 if (ket_ends && *s == '}') break;
3602 if (*s != '$' || !honour_dollar)
3604 yield = string_cat(yield, &size, &ptr, s++, 1);
3608 /* No { after the $ - must be a plain name or a number for string
3609 match variable. There has to be a fudge for variables that are the
3610 names of header fields preceded by "$header_" because header field
3611 names can contain any printing characters except space and colon.
3612 For those that don't like typing this much, "$h_" is a synonym for
3613 "$header_". A non-existent header yields a NULL value; nothing is
3616 if (isalpha((*(++s))))
3621 s = read_name(name, sizeof(name), s, US"_");
3623 /* If this is the first thing to be expanded, release the pre-allocated
3626 if (ptr == 0 && yield != NULL)
3628 if (resetok) store_reset(yield);
3635 if (Ustrncmp(name, "h_", 2) == 0 ||
3636 Ustrncmp(name, "rh_", 3) == 0 ||
3637 Ustrncmp(name, "bh_", 3) == 0 ||
3638 Ustrncmp(name, "header_", 7) == 0 ||
3639 Ustrncmp(name, "rheader_", 8) == 0 ||
3640 Ustrncmp(name, "bheader_", 8) == 0)
3642 BOOL want_raw = (name[0] == 'r')? TRUE : FALSE;
3643 uschar *charset = (name[0] == 'b')? NULL : headers_charset;
3644 s = read_header_name(name, sizeof(name), s);
3645 value = find_header(name, FALSE, &newsize, want_raw, charset);
3647 /* If we didn't find the header, and the header contains a closing brace
3648 character, this may be a user error where the terminating colon
3649 has been omitted. Set a flag to adjust the error message in this case.
3650 But there is no error here - nothing gets inserted. */
3654 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
3663 value = find_variable(name, FALSE, skipping, &newsize);
3666 expand_string_message =
3667 string_sprintf("unknown variable name \"%s\"", name);
3668 check_variable_error_message(name);
3673 /* If the data is known to be in a new buffer, newsize will be set to the
3674 size of that buffer. If this is the first thing in an expansion string,
3675 yield will be NULL; just point it at the new store instead of copying. Many
3676 expansion strings contain just one reference, so this is a useful
3677 optimization, especially for humungous headers. */
3679 len = Ustrlen(value);
3680 if (yield == NULL && newsize != 0)
3686 else yield = string_cat(yield, &size, &ptr, value, len);
3694 s = read_number(&n, s);
3695 if (n >= 0 && n <= expand_nmax)
3696 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
3701 /* Otherwise, if there's no '{' after $ it's an error. */
3705 expand_string_message = US"$ not followed by letter, digit, or {";
3709 /* After { there can be various things, but they all start with
3710 an initial word, except for a number for a string match variable. */
3712 if (isdigit((*(++s))))
3715 s = read_number(&n, s);
3718 expand_string_message = US"} expected after number";
3721 if (n >= 0 && n <= expand_nmax)
3722 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
3729 expand_string_message = US"letter or digit expected after ${";
3733 /* Allow "-" in names to cater for substrings with negative
3734 arguments. Since we are checking for known names after { this is
3737 s = read_name(name, sizeof(name), s, US"_-");
3738 item_type = chop_match(name, item_table, sizeof(item_table)/sizeof(uschar *));
3742 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
3743 If the ACL returns accept or reject we return content set by "message ="
3744 There is currently no limit on recursion; this would have us call
3745 acl_check_internal() directly and get a current level from somewhere.
3746 See also the acl expansion condition ECOND_ACL and the traditional
3747 acl modifier ACLC_ACL.
3751 /* ${acl {name} {arg1}{arg2}...} */
3753 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
3756 switch(read_subs(sub, 10, 1, &s, skipping, TRUE, US"acl"))
3758 case 1: goto EXPAND_FAILED_CURLY;
3760 case 3: goto EXPAND_FAILED;
3762 if (skipping) continue;
3764 switch(eval_acl(sub, sizeof(sub)/sizeof(*sub), &user_msg))
3769 yield = string_cat(yield, &size, &ptr, user_msg, Ustrlen(user_msg));
3773 expand_string_forcedfail = TRUE;
3775 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
3780 /* Handle conditionals - preserve the values of the numerical expansion
3781 variables in case they get changed by a regular expression match in the
3782 condition. If not, they retain their external settings. At the end
3783 of this "if" section, they get restored to their previous values. */
3789 int save_expand_nmax =
3790 save_expand_strings(save_expand_nstring, save_expand_nlength);
3792 while (isspace(*s)) s++;
3793 next_s = eval_condition(s, skipping? NULL : &cond);
3794 if (next_s == NULL) goto EXPAND_FAILED; /* message already set */
3797 debug_printf("condition: %.*s\n result: %s\n", (int)(next_s - s), s,
3798 cond? "true" : "false");
3802 /* The handling of "yes" and "no" result strings is now in a separate
3803 function that is also used by ${lookup} and ${extract} and ${run}. */
3805 switch(process_yesno(
3806 skipping, /* were previously skipping */
3807 cond, /* success/failure indicator */
3808 lookup_value, /* value to reset for string2 */
3809 &s, /* input pointer */
3810 &yield, /* output pointer */
3811 &size, /* output size */
3812 &ptr, /* output current point */
3813 US"if")) /* condition type */
3815 case 1: goto EXPAND_FAILED; /* when all is well, the */
3816 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
3819 /* Restore external setting of expansion variables for continuation
3822 restore_expand_strings(save_expand_nmax, save_expand_nstring,
3823 save_expand_nlength);
3827 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
3828 expanding an internal string that isn't actually going to be used. All we
3829 need to do is check the syntax, so don't do a lookup at all. Preserve the
3830 values of the numerical expansion variables in case they get changed by a
3831 partial lookup. If not, they retain their external settings. At the end
3832 of this "lookup" section, they get restored to their previous values. */
3836 int stype, partial, affixlen, starflags;
3837 int expand_setup = 0;
3839 uschar *key, *filename, *affix;
3840 uschar *save_lookup_value = lookup_value;
3841 int save_expand_nmax =
3842 save_expand_strings(save_expand_nstring, save_expand_nlength);
3844 if ((expand_forbid & RDO_LOOKUP) != 0)
3846 expand_string_message = US"lookup expansions are not permitted";
3850 /* Get the key we are to look up for single-key+file style lookups.
3851 Otherwise set the key NULL pro-tem. */
3853 while (isspace(*s)) s++;
3856 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
3857 if (key == NULL) goto EXPAND_FAILED;
3858 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3859 while (isspace(*s)) s++;
3863 /* Find out the type of database */
3867 expand_string_message = US"missing lookup type";
3871 /* The type is a string that may contain special characters of various
3872 kinds. Allow everything except space or { to appear; the actual content
3873 is checked by search_findtype_partial. */
3875 while (*s != 0 && *s != '{' && !isspace(*s))
3877 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
3881 while (isspace(*s)) s++;
3883 /* Now check for the individual search type and any partial or default
3884 options. Only those types that are actually in the binary are valid. */
3886 stype = search_findtype_partial(name, &partial, &affix, &affixlen,
3890 expand_string_message = search_error_message;
3894 /* Check that a key was provided for those lookup types that need it,
3895 and was not supplied for those that use the query style. */
3897 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
3901 expand_string_message = string_sprintf("missing {key} for single-"
3902 "key \"%s\" lookup", name);
3910 expand_string_message = string_sprintf("a single key was given for "
3911 "lookup type \"%s\", which is not a single-key lookup type", name);
3916 /* Get the next string in brackets and expand it. It is the file name for
3917 single-key+file lookups, and the whole query otherwise. In the case of
3918 queries that also require a file name (e.g. sqlite), the file name comes
3921 if (*s != '{') goto EXPAND_FAILED_CURLY;
3922 filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
3923 if (filename == NULL) goto EXPAND_FAILED;
3924 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3925 while (isspace(*s)) s++;
3927 /* If this isn't a single-key+file lookup, re-arrange the variables
3928 to be appropriate for the search_ functions. For query-style lookups,
3929 there is just a "key", and no file name. For the special query-style +
3930 file types, the query (i.e. "key") starts with a file name. */
3934 while (isspace(*filename)) filename++;
3937 if (mac_islookup(stype, lookup_querystyle))
3943 if (*filename != '/')
3945 expand_string_message = string_sprintf(
3946 "absolute file name expected for \"%s\" lookup", name);
3949 while (*key != 0 && !isspace(*key)) key++;
3950 if (*key != 0) *key++ = 0;
3954 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
3955 the entry was not found. Note that there is no search_close() function.
3956 Files are left open in case of re-use. At suitable places in higher logic,
3957 search_tidyup() is called to tidy all open files. This can save opening
3958 the same file several times. However, files may also get closed when
3959 others are opened, if too many are open at once. The rule is that a
3960 handle should not be used after a second search_open().
3962 Request that a partial search sets up $1 and maybe $2 by passing
3963 expand_setup containing zero. If its value changes, reset expand_nmax,
3964 since new variables will have been set. Note that at the end of this
3965 "lookup" section, the old numeric variables are restored. */
3968 lookup_value = NULL;
3971 void *handle = search_open(filename, stype, 0, NULL, NULL);
3974 expand_string_message = search_error_message;
3977 lookup_value = search_find(handle, filename, key, partial, affix,
3978 affixlen, starflags, &expand_setup);
3979 if (search_find_defer)
3981 expand_string_message =
3982 string_sprintf("lookup of \"%s\" gave DEFER: %s",
3983 string_printing2(key, FALSE), search_error_message);
3986 if (expand_setup > 0) expand_nmax = expand_setup;
3989 /* The handling of "yes" and "no" result strings is now in a separate
3990 function that is also used by ${if} and ${extract}. */
3992 switch(process_yesno(
3993 skipping, /* were previously skipping */
3994 lookup_value != NULL, /* success/failure indicator */
3995 save_lookup_value, /* value to reset for string2 */
3996 &s, /* input pointer */
3997 &yield, /* output pointer */
3998 &size, /* output size */
3999 &ptr, /* output current point */
4000 US"lookup")) /* condition type */
4002 case 1: goto EXPAND_FAILED; /* when all is well, the */
4003 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4006 /* Restore external setting of expansion variables for carrying on
4007 at this level, and continue. */
4009 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4010 save_expand_nlength);
4014 /* If Perl support is configured, handle calling embedded perl subroutines,
4015 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
4016 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
4017 arguments (defined below). */
4019 #define EXIM_PERL_MAX_ARGS 8
4023 expand_string_message = US"\"${perl\" encountered, but this facility "
4024 "is not included in this binary";
4027 #else /* EXIM_PERL */
4029 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
4032 if ((expand_forbid & RDO_PERL) != 0)
4034 expand_string_message = US"Perl calls are not permitted";
4038 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
4041 case 1: goto EXPAND_FAILED_CURLY;
4043 case 3: goto EXPAND_FAILED;
4046 /* If skipping, we don't actually do anything */
4048 if (skipping) continue;
4050 /* Start the interpreter if necessary */
4052 if (!opt_perl_started)
4055 if (opt_perl_startup == NULL)
4057 expand_string_message = US"A setting of perl_startup is needed when "
4058 "using the Perl interpreter";
4061 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4062 initerror = init_perl(opt_perl_startup);
4063 if (initerror != NULL)
4065 expand_string_message =
4066 string_sprintf("error in perl_startup code: %s\n", initerror);
4069 opt_perl_started = TRUE;
4072 /* Call the function */
4074 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
4075 new_yield = call_perl_cat(yield, &size, &ptr, &expand_string_message,
4076 sub_arg[0], sub_arg + 1);
4078 /* NULL yield indicates failure; if the message pointer has been set to
4079 NULL, the yield was undef, indicating a forced failure. Otherwise the
4080 message will indicate some kind of Perl error. */
4082 if (new_yield == NULL)
4084 if (expand_string_message == NULL)
4086 expand_string_message =
4087 string_sprintf("Perl subroutine \"%s\" returned undef to force "
4088 "failure", sub_arg[0]);
4089 expand_string_forcedfail = TRUE;
4094 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
4095 set during a callback from Perl. */
4097 expand_string_forcedfail = FALSE;
4101 #endif /* EXIM_PERL */
4103 /* Transform email address to "prvs" scheme to use
4104 as BATV-signed return path */
4111 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, US"prvs"))
4113 case 1: goto EXPAND_FAILED_CURLY;
4115 case 3: goto EXPAND_FAILED;
4118 /* If skipping, we don't actually do anything */
4119 if (skipping) continue;
4121 /* sub_arg[0] is the address */
4122 domain = Ustrrchr(sub_arg[0],'@');
4123 if ( (domain == NULL) || (domain == sub_arg[0]) || (Ustrlen(domain) == 1) )
4125 expand_string_message = US"prvs first argument must be a qualified email address";
4129 /* Calculate the hash. The second argument must be a single-digit
4130 key number, or unset. */
4132 if (sub_arg[2] != NULL &&
4133 (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
4135 expand_string_message = US"prvs second argument must be a single digit";
4139 p = prvs_hmac_sha1(sub_arg[0],sub_arg[1],sub_arg[2],prvs_daystamp(7));
4142 expand_string_message = US"prvs hmac-sha1 conversion failed";
4146 /* Now separate the domain from the local part */
4149 yield = string_cat(yield,&size,&ptr,US"prvs=",5);
4150 string_cat(yield,&size,&ptr,(sub_arg[2] != NULL) ? sub_arg[2] : US"0", 1);
4151 string_cat(yield,&size,&ptr,prvs_daystamp(7),3);
4152 string_cat(yield,&size,&ptr,p,6);
4153 string_cat(yield,&size,&ptr,US"=",1);
4154 string_cat(yield,&size,&ptr,sub_arg[0],Ustrlen(sub_arg[0]));
4155 string_cat(yield,&size,&ptr,US"@",1);
4156 string_cat(yield,&size,&ptr,domain,Ustrlen(domain));
4161 /* Check a prvs-encoded address for validity */
4163 case EITEM_PRVSCHECK:
4166 int mysize = 0, myptr = 0;
4170 /* TF: Ugliness: We want to expand parameter 1 first, then set
4171 up expansion variables that are used in the expansion of
4172 parameter 2. So we clone the string for the first
4173 expansion, where we only expand parameter 1.
4175 PH: Actually, that isn't necessary. The read_subs() function is
4176 designed to work this way for the ${if and ${lookup expansions. I've
4180 /* Reset expansion variables */
4181 prvscheck_result = NULL;
4182 prvscheck_address = NULL;
4183 prvscheck_keynum = NULL;
4185 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs"))
4187 case 1: goto EXPAND_FAILED_CURLY;
4189 case 3: goto EXPAND_FAILED;
4192 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
4195 if (regex_match_and_setup(re,sub_arg[0],0,-1))
4197 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
4198 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
4199 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
4200 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
4201 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
4203 DEBUG(D_expand) debug_printf("prvscheck localpart: %s\n", local_part);
4204 DEBUG(D_expand) debug_printf("prvscheck key number: %s\n", key_num);
4205 DEBUG(D_expand) debug_printf("prvscheck daystamp: %s\n", daystamp);
4206 DEBUG(D_expand) debug_printf("prvscheck hash: %s\n", hash);
4207 DEBUG(D_expand) debug_printf("prvscheck domain: %s\n", domain);
4209 /* Set up expansion variables */
4210 prvscheck_address = string_cat(NULL, &mysize, &myptr, local_part, Ustrlen(local_part));
4211 string_cat(prvscheck_address,&mysize,&myptr,US"@",1);
4212 string_cat(prvscheck_address,&mysize,&myptr,domain,Ustrlen(domain));
4213 prvscheck_address[myptr] = '\0';
4214 prvscheck_keynum = string_copy(key_num);
4216 /* Now expand the second argument */
4217 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs"))
4219 case 1: goto EXPAND_FAILED_CURLY;
4221 case 3: goto EXPAND_FAILED;
4224 /* Now we have the key and can check the address. */
4226 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
4231 expand_string_message = US"hmac-sha1 conversion failed";
4235 DEBUG(D_expand) debug_printf("prvscheck: received hash is %s\n", hash);
4236 DEBUG(D_expand) debug_printf("prvscheck: own hash is %s\n", p);
4238 if (Ustrcmp(p,hash) == 0)
4240 /* Success, valid BATV address. Now check the expiry date. */
4241 uschar *now = prvs_daystamp(0);
4242 unsigned int inow = 0,iexpire = 1;
4244 (void)sscanf(CS now,"%u",&inow);
4245 (void)sscanf(CS daystamp,"%u",&iexpire);
4247 /* When "iexpire" is < 7, a "flip" has occured.
4248 Adjust "inow" accordingly. */
4249 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
4251 if (iexpire >= inow)
4253 prvscheck_result = US"1";
4254 DEBUG(D_expand) debug_printf("prvscheck: success, $pvrs_result set to 1\n");
4258 prvscheck_result = NULL;
4259 DEBUG(D_expand) debug_printf("prvscheck: signature expired, $pvrs_result unset\n");
4264 prvscheck_result = NULL;
4265 DEBUG(D_expand) debug_printf("prvscheck: hash failure, $pvrs_result unset\n");
4268 /* Now expand the final argument. We leave this till now so that
4269 it can include $prvscheck_result. */
4271 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, US"prvs"))
4273 case 1: goto EXPAND_FAILED_CURLY;
4275 case 3: goto EXPAND_FAILED;
4278 if (sub_arg[0] == NULL || *sub_arg[0] == '\0')
4279 yield = string_cat(yield,&size,&ptr,prvscheck_address,Ustrlen(prvscheck_address));
4281 yield = string_cat(yield,&size,&ptr,sub_arg[0],Ustrlen(sub_arg[0]));
4283 /* Reset the "internal" variables afterwards, because they are in
4284 dynamic store that will be reclaimed if the expansion succeeded. */
4286 prvscheck_address = NULL;
4287 prvscheck_keynum = NULL;
4291 /* Does not look like a prvs encoded address, return the empty string.
4292 We need to make sure all subs are expanded first, so as to skip over
4295 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"prvs"))
4297 case 1: goto EXPAND_FAILED_CURLY;
4299 case 3: goto EXPAND_FAILED;
4306 /* Handle "readfile" to insert an entire file */
4308 case EITEM_READFILE:
4313 if ((expand_forbid & RDO_READFILE) != 0)
4315 expand_string_message = US"file insertions are not permitted";
4319 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile"))
4321 case 1: goto EXPAND_FAILED_CURLY;
4323 case 3: goto EXPAND_FAILED;
4326 /* If skipping, we don't actually do anything */
4328 if (skipping) continue;
4330 /* Open the file and read it */
4332 f = Ufopen(sub_arg[0], "rb");
4335 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
4339 yield = cat_file(f, yield, &size, &ptr, sub_arg[1]);
4344 /* Handle "readsocket" to insert data from a Unix domain socket */
4346 case EITEM_READSOCK:
4352 struct sockaddr_un sockun; /* don't call this "sun" ! */
4356 if ((expand_forbid & RDO_READSOCK) != 0)
4358 expand_string_message = US"socket insertions are not permitted";
4362 /* Read up to 4 arguments, but don't do the end of item check afterwards,
4363 because there may be a string for expansion on failure. */
4365 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket"))
4367 case 1: goto EXPAND_FAILED_CURLY;
4368 case 2: /* Won't occur: no end check */
4369 case 3: goto EXPAND_FAILED;
4372 /* Sort out timeout, if given */
4374 if (sub_arg[2] != NULL)
4376 timeout = readconf_readtime(sub_arg[2], 0, FALSE);
4379 expand_string_message = string_sprintf("bad time value %s",
4384 else sub_arg[3] = NULL; /* No eol if no timeout */
4386 /* If skipping, we don't actually do anything. Otherwise, arrange to
4387 connect to either an IP or a Unix socket. */
4391 /* Handle an IP (internet) domain */
4393 if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
4395 BOOL connected = FALSE;
4399 uschar *server_name = sub_arg[0] + 5;
4400 uschar *port_name = Ustrrchr(server_name, ':');
4402 /* Sort out the port */
4404 if (port_name == NULL)
4406 expand_string_message =
4407 string_sprintf("missing port for readsocket %s", sub_arg[0]);
4410 *port_name++ = 0; /* Terminate server name */
4412 if (isdigit(*port_name))
4415 port = Ustrtol(port_name, &end, 0);
4416 if (end != port_name + Ustrlen(port_name))
4418 expand_string_message =
4419 string_sprintf("invalid port number %s", port_name);
4425 struct servent *service_info = getservbyname(CS port_name, "tcp");
4426 if (service_info == NULL)
4428 expand_string_message = string_sprintf("unknown port \"%s\"",
4432 port = ntohs(service_info->s_port);
4435 /* Sort out the server. */
4438 shost.address = NULL;
4442 namelen = Ustrlen(server_name);
4444 /* Anything enclosed in [] must be an IP address. */
4446 if (server_name[0] == '[' &&
4447 server_name[namelen - 1] == ']')
4449 server_name[namelen - 1] = 0;
4451 if (string_is_ip_address(server_name, NULL) == 0)
4453 expand_string_message =
4454 string_sprintf("malformed IP address \"%s\"", server_name);
4457 shost.name = shost.address = server_name;
4460 /* Otherwise check for an unadorned IP address */
4462 else if (string_is_ip_address(server_name, NULL) != 0)
4463 shost.name = shost.address = server_name;
4465 /* Otherwise lookup IP address(es) from the name */
4469 shost.name = server_name;
4470 if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, NULL,
4471 FALSE) != HOST_FOUND)
4473 expand_string_message =
4474 string_sprintf("no IP address found for host %s", shost.name);
4479 /* Try to connect to the server - test each IP till one works */
4481 for (h = &shost; h != NULL; h = h->next)
4483 int af = (Ustrchr(h->address, ':') != 0)? AF_INET6 : AF_INET;
4484 if ((fd = ip_socket(SOCK_STREAM, af)) == -1)
4486 expand_string_message = string_sprintf("failed to create socket: "
4487 "%s", strerror(errno));
4491 if (ip_connect(fd, af, h->address, port, timeout) == 0)
4500 expand_string_message = string_sprintf("failed to connect to "
4501 "socket %s: couldn't connect to any host", sub_arg[0],
4507 /* Handle a Unix domain socket */
4512 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
4514 expand_string_message = string_sprintf("failed to create socket: %s",
4519 sockun.sun_family = AF_UNIX;
4520 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
4523 sigalrm_seen = FALSE;
4525 rc = connect(fd, (struct sockaddr *)(&sockun), sizeof(sockun));
4529 expand_string_message = US "socket connect timed out";
4534 expand_string_message = string_sprintf("failed to connect to socket "
4535 "%s: %s", sub_arg[0], strerror(errno));
4540 DEBUG(D_expand) debug_printf("connected to socket %s\n", sub_arg[0]);
4542 /* Write the request string, if not empty */
4544 if (sub_arg[1][0] != 0)
4546 int len = Ustrlen(sub_arg[1]);
4547 DEBUG(D_expand) debug_printf("writing \"%s\" to socket\n",
4549 if (write(fd, sub_arg[1], len) != len)
4551 expand_string_message = string_sprintf("request write to socket "
4552 "failed: %s", strerror(errno));
4557 /* Shut down the sending side of the socket. This helps some servers to
4558 recognise that it is their turn to do some work. Just in case some
4559 system doesn't have this function, make it conditional. */
4562 shutdown(fd, SHUT_WR);
4565 /* Now we need to read from the socket, under a timeout. The function
4566 that reads a file can be used. */
4568 f = fdopen(fd, "rb");
4569 sigalrm_seen = FALSE;
4571 yield = cat_file(f, yield, &size, &ptr, sub_arg[3]);
4575 /* After a timeout, we restore the pointer in the result, that is,
4576 make sure we add nothing from the socket. */
4581 expand_string_message = US "socket read timed out";
4586 /* The whole thing has worked (or we were skipping). If there is a
4587 failure string following, we need to skip it. */
4591 if (expand_string_internal(s+1, TRUE, &s, TRUE, TRUE) == NULL)
4593 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4594 while (isspace(*s)) s++;
4596 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4599 /* Come here on failure to create socket, connect socket, write to the
4600 socket, or timeout on reading. If another substring follows, expand and
4601 use it. Otherwise, those conditions give expand errors. */
4604 if (*s != '{') goto EXPAND_FAILED;
4605 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
4606 arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE);
4607 if (arg == NULL) goto EXPAND_FAILED;
4608 yield = string_cat(yield, &size, &ptr, arg, Ustrlen(arg));
4609 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4610 while (isspace(*s)) s++;
4611 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4615 /* Handle "run" to execute a program. */
4627 if ((expand_forbid & RDO_RUN) != 0)
4629 expand_string_message = US"running a command is not permitted";
4633 while (isspace(*s)) s++;
4634 if (*s != '{') goto EXPAND_FAILED_CURLY;
4635 arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
4636 if (arg == NULL) goto EXPAND_FAILED;
4637 while (isspace(*s)) s++;
4638 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
4640 if (skipping) /* Just pretend it worked when we're skipping */
4646 if (!transport_set_up_command(&argv, /* anchor for arg list */
4647 arg, /* raw command */
4648 FALSE, /* don't expand the arguments */
4649 0, /* not relevant when... */
4650 NULL, /* no transporting address */
4651 US"${run} expansion", /* for error messages */
4652 &expand_string_message)) /* where to put error message */
4657 /* Create the child process, making it a group leader. */
4659 pid = child_open(argv, NULL, 0077, &fd_in, &fd_out, TRUE);
4663 expand_string_message =
4664 string_sprintf("couldn't create child process: %s", strerror(errno));
4668 /* Nothing is written to the standard input. */
4672 /* Read the pipe to get the command's output into $value (which is kept
4673 in lookup_value). Read during execution, so that if the output exceeds
4674 the OS pipe buffer limit, we don't block forever. */
4676 f = fdopen(fd_out, "rb");
4677 sigalrm_seen = FALSE;
4679 lookup_value = cat_file(f, lookup_value, &lsize, &lptr, NULL);
4683 /* Wait for the process to finish, applying the timeout, and inspect its
4684 return code for serious disasters. Simple non-zero returns are passed on.
4687 if (sigalrm_seen == TRUE || (runrc = child_close(pid, 30)) < 0)
4689 if (sigalrm_seen == TRUE || runrc == -256)
4691 expand_string_message = string_sprintf("command timed out");
4692 killpg(pid, SIGKILL); /* Kill the whole process group */
4695 else if (runrc == -257)
4696 expand_string_message = string_sprintf("wait() failed: %s",
4700 expand_string_message = string_sprintf("command killed by signal %d",
4707 /* Process the yes/no strings; $value may be useful in both cases */
4709 switch(process_yesno(
4710 skipping, /* were previously skipping */
4711 runrc == 0, /* success/failure indicator */
4712 lookup_value, /* value to reset for string2 */
4713 &s, /* input pointer */
4714 &yield, /* output pointer */
4715 &size, /* output size */
4716 &ptr, /* output current point */
4717 US"run")) /* condition type */
4719 case 1: goto EXPAND_FAILED; /* when all is well, the */
4720 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4726 /* Handle character translation for "tr" */
4734 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr"))
4736 case 1: goto EXPAND_FAILED_CURLY;
4738 case 3: goto EXPAND_FAILED;
4741 yield = string_cat(yield, &size, &ptr, sub[0], Ustrlen(sub[0]));
4742 o2m = Ustrlen(sub[2]) - 1;
4744 if (o2m >= 0) for (; oldptr < ptr; oldptr++)
4746 uschar *m = Ustrrchr(sub[1], yield[oldptr]);
4750 yield[oldptr] = sub[2][(o < o2m)? o : o2m];
4757 /* Handle "hash", "length", "nhash", and "substr" when they are given with
4758 expanded arguments. */
4768 int val[2] = { 0, -1 };
4771 /* "length" takes only 2 arguments whereas the others take 2 or 3.
4772 Ensure that sub[2] is set in the ${length case. */
4775 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
4778 case 1: goto EXPAND_FAILED_CURLY;
4780 case 3: goto EXPAND_FAILED;
4783 /* Juggle the arguments if there are only two of them: always move the
4784 string to the last position and make ${length{n}{str}} equivalent to
4785 ${substr{0}{n}{str}}. See the defaults for val[] above. */
4791 if (item_type == EITEM_LENGTH)
4798 for (i = 0; i < 2; i++)
4800 if (sub[i] == NULL) continue;
4801 val[i] = (int)Ustrtol(sub[i], &ret, 10);
4802 if (*ret != 0 || (i != 0 && val[i] < 0))
4804 expand_string_message = string_sprintf("\"%s\" is not a%s number "
4805 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
4811 (item_type == EITEM_HASH)?
4812 compute_hash(sub[2], val[0], val[1], &len) :
4813 (item_type == EITEM_NHASH)?
4814 compute_nhash(sub[2], val[0], val[1], &len) :
4815 extract_substr(sub[2], val[0], val[1], &len);
4817 if (ret == NULL) goto EXPAND_FAILED;
4818 yield = string_cat(yield, &size, &ptr, ret, len);
4822 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
4823 This code originally contributed by Steve Haslam. It currently supports
4824 the use of MD5 and SHA-1 hashes.
4826 We need some workspace that is large enough to handle all the supported
4827 hash types. Use macros to set the sizes rather than be too elaborate. */
4829 #define MAX_HASHLEN 20
4830 #define MAX_HASHBLOCKLEN 64
4839 int hashlen; /* Number of octets for the hash algorithm's output */
4840 int hashblocklen; /* Number of octets the hash algorithm processes */
4842 unsigned int keylen;
4844 uschar keyhash[MAX_HASHLEN];
4845 uschar innerhash[MAX_HASHLEN];
4846 uschar finalhash[MAX_HASHLEN];
4847 uschar finalhash_hex[2*MAX_HASHLEN];
4848 uschar innerkey[MAX_HASHBLOCKLEN];
4849 uschar outerkey[MAX_HASHBLOCKLEN];
4851 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name))
4853 case 1: goto EXPAND_FAILED_CURLY;
4855 case 3: goto EXPAND_FAILED;
4858 if (Ustrcmp(sub[0], "md5") == 0)
4861 use_base = &md5_base;
4865 else if (Ustrcmp(sub[0], "sha1") == 0)
4868 use_base = &sha1_base;
4874 expand_string_message =
4875 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
4880 keylen = Ustrlen(keyptr);
4882 /* If the key is longer than the hash block length, then hash the key
4885 if (keylen > hashblocklen)
4887 chash_start(type, use_base);
4888 chash_end(type, use_base, keyptr, keylen, keyhash);
4893 /* Now make the inner and outer key values */
4895 memset(innerkey, 0x36, hashblocklen);
4896 memset(outerkey, 0x5c, hashblocklen);
4898 for (i = 0; i < keylen; i++)
4900 innerkey[i] ^= keyptr[i];
4901 outerkey[i] ^= keyptr[i];
4904 /* Now do the hashes */
4906 chash_start(type, use_base);
4907 chash_mid(type, use_base, innerkey);
4908 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
4910 chash_start(type, use_base);
4911 chash_mid(type, use_base, outerkey);
4912 chash_end(type, use_base, innerhash, hashlen, finalhash);
4914 /* Encode the final hash as a hex string */
4917 for (i = 0; i < hashlen; i++)
4919 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
4920 *p++ = hex_digits[finalhash[i] & 0x0f];
4923 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%.*s)=%.*s\n", sub[0],
4924 (int)keylen, keyptr, Ustrlen(sub[2]), sub[2], hashlen*2, finalhash_hex);
4926 yield = string_cat(yield, &size, &ptr, finalhash_hex, hashlen*2);
4931 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
4932 We have to save the numerical variables and restore them afterwards. */
4937 int moffset, moffsetextra, slen;
4940 const uschar *rerror;
4943 int save_expand_nmax =
4944 save_expand_strings(save_expand_nstring, save_expand_nlength);
4946 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"sg"))
4948 case 1: goto EXPAND_FAILED_CURLY;
4950 case 3: goto EXPAND_FAILED;
4953 /* Compile the regular expression */
4955 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
4960 expand_string_message = string_sprintf("regular expression error in "
4961 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
4965 /* Now run a loop to do the substitutions as often as necessary. It ends
4966 when there are no more matches. Take care over matches of the null string;
4967 do the same thing as Perl does. */
4970 slen = Ustrlen(sub[0]);
4971 moffset = moffsetextra = 0;
4976 int ovector[3*(EXPAND_MAXN+1)];
4977 int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra,
4978 PCRE_EOPT | emptyopt, ovector, sizeof(ovector)/sizeof(int));
4982 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
4983 is not necessarily the end. We want to repeat the match from one
4984 character further along, but leaving the basic offset the same (for
4985 copying below). We can't be at the end of the string - that was checked
4986 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
4987 finished; copy the remaining string and end the loop. */
4997 yield = string_cat(yield, &size, &ptr, subject+moffset, slen-moffset);
5001 /* Match - set up for expanding the replacement. */
5003 if (n == 0) n = EXPAND_MAXN + 1;
5005 for (nn = 0; nn < n*2; nn += 2)
5007 expand_nstring[expand_nmax] = subject + ovector[nn];
5008 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
5012 /* Copy the characters before the match, plus the expanded insertion. */
5014 yield = string_cat(yield, &size, &ptr, subject + moffset,
5015 ovector[0] - moffset);
5016 insert = expand_string(sub[2]);
5017 if (insert == NULL) goto EXPAND_FAILED;
5018 yield = string_cat(yield, &size, &ptr, insert, Ustrlen(insert));
5020 moffset = ovector[1];
5024 /* If we have matched an empty string, first check to see if we are at
5025 the end of the subject. If so, the loop is over. Otherwise, mimic
5026 what Perl's /g options does. This turns out to be rather cunning. First
5027 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5028 string at the same point. If this fails (picked up above) we advance to
5029 the next character. */
5031 if (ovector[0] == ovector[1])
5033 if (ovector[0] == slen) break;
5034 emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED;
5038 /* All done - restore numerical variables. */
5040 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5041 save_expand_nlength);
5045 /* Handle keyed and numbered substring extraction. If the first argument
5046 consists entirely of digits, then a numerical extraction is assumed. */
5052 int field_number = 1;
5053 BOOL field_number_set = FALSE;
5054 uschar *save_lookup_value = lookup_value;
5056 int save_expand_nmax =
5057 save_expand_strings(save_expand_nstring, save_expand_nlength);
5059 /* Read the arguments */
5061 for (i = 0; i < j; i++)
5063 while (isspace(*s)) s++;
5066 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
5067 if (sub[i] == NULL) goto EXPAND_FAILED;
5068 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5070 /* After removal of leading and trailing white space, the first
5071 argument must not be empty; if it consists entirely of digits
5072 (optionally preceded by a minus sign), this is a numerical
5073 extraction, and we expect 3 arguments. */
5081 while (isspace(*p)) p++;
5085 while (len > 0 && isspace(p[len-1])) len--;
5088 if (*p == 0 && !skipping)
5090 expand_string_message = US"first argument of \"extract\" must "
5100 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
5104 j = 3; /* Need 3 args */
5105 field_number_set = TRUE;
5109 else goto EXPAND_FAILED_CURLY;
5112 /* Extract either the numbered or the keyed substring into $value. If
5113 skipping, just pretend the extraction failed. */
5115 lookup_value = skipping? NULL : field_number_set?
5116 expand_gettokened(field_number, sub[1], sub[2]) :
5117 expand_getkeyed(sub[0], sub[1]);
5119 /* If no string follows, $value gets substituted; otherwise there can
5120 be yes/no strings, as for lookup or if. */
5122 switch(process_yesno(
5123 skipping, /* were previously skipping */
5124 lookup_value != NULL, /* success/failure indicator */
5125 save_lookup_value, /* value to reset for string2 */
5126 &s, /* input pointer */
5127 &yield, /* output pointer */
5128 &size, /* output size */
5129 &ptr, /* output current point */
5130 US"extract")) /* condition type */
5132 case 1: goto EXPAND_FAILED; /* when all is well, the */
5133 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5136 /* All done - restore numerical variables. */
5138 restore_expand_strings(save_expand_nmax, save_expand_nstring,
5139 save_expand_nlength);
5145 /* Handle list operations */
5153 uschar outsep[2] = { '\0', '\0' };
5154 uschar *list, *expr, *temp;
5155 uschar *save_iterate_item = iterate_item;
5156 uschar *save_lookup_value = lookup_value;
5158 while (isspace(*s)) s++;
5159 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5161 list = expand_string_internal(s, TRUE, &s, skipping, TRUE);
5162 if (list == NULL) goto EXPAND_FAILED;
5163 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5165 if (item_type == EITEM_REDUCE)
5167 while (isspace(*s)) s++;
5168 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5169 temp = expand_string_internal(s, TRUE, &s, skipping, TRUE);
5170 if (temp == NULL) goto EXPAND_FAILED;
5171 lookup_value = temp;
5172 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
5175 while (isspace(*s)) s++;
5176 if (*s++ != '{') goto EXPAND_FAILED_CURLY;
5180 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
5181 if scanning a "false" part). This allows us to find the end of the
5182 condition, because if the list is empty, we won't actually evaluate the
5183 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
5184 the normal internal expansion function. */
5186 if (item_type == EITEM_FILTER)
5188 temp = eval_condition(expr, NULL);
5189 if (temp != NULL) s = temp;
5193 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE);
5198 expand_string_message = string_sprintf("%s inside \"%s\" item",
5199 expand_string_message, name);
5203 while (isspace(*s)) s++;
5206 expand_string_message = string_sprintf("missing } at end of condition "
5207 "or expression inside \"%s\"", name);
5211 while (isspace(*s)) s++;
5214 expand_string_message = string_sprintf("missing } at end of \"%s\"",
5219 /* If we are skipping, we can now just move on to the next item. When
5220 processing for real, we perform the iteration. */
5222 if (skipping) continue;
5223 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)) != NULL)
5225 *outsep = (uschar)sep; /* Separator as a string */
5227 DEBUG(D_expand) debug_printf("%s: $item = \"%s\"\n", name, iterate_item);
5229 if (item_type == EITEM_FILTER)
5232 if (eval_condition(expr, &condresult) == NULL)
5234 iterate_item = save_iterate_item;
5235 lookup_value = save_lookup_value;
5236 expand_string_message = string_sprintf("%s inside \"%s\" condition",
5237 expand_string_message, name);
5240 DEBUG(D_expand) debug_printf("%s: condition is %s\n", name,
5241 condresult? "true":"false");
5243 temp = iterate_item; /* TRUE => include this item */
5245 continue; /* FALSE => skip this item */
5248 /* EITEM_MAP and EITEM_REDUCE */
5252 temp = expand_string_internal(expr, TRUE, NULL, skipping, TRUE);
5255 iterate_item = save_iterate_item;
5256 expand_string_message = string_sprintf("%s inside \"%s\" item",
5257 expand_string_message, name);
5260 if (item_type == EITEM_REDUCE)
5262 lookup_value = temp; /* Update the value of $value */
5263 continue; /* and continue the iteration */
5267 /* We reach here for FILTER if the condition is true, always for MAP,
5268 and never for REDUCE. The value in "temp" is to be added to the output
5269 list that is being created, ensuring that any occurrences of the
5270 separator character are doubled. Unless we are dealing with the first
5271 item of the output list, add in a space if the new item begins with the
5272 separator character, or is an empty string. */
5274 if (ptr != save_ptr && (temp[0] == *outsep || temp[0] == 0))
5275 yield = string_cat(yield, &size, &ptr, US" ", 1);
5277 /* Add the string in "temp" to the output list that we are building,
5278 This is done in chunks by searching for the separator character. */
5282 size_t seglen = Ustrcspn(temp, outsep);
5283 yield = string_cat(yield, &size, &ptr, temp, seglen + 1);
5285 /* If we got to the end of the string we output one character
5286 too many; backup and end the loop. Otherwise arrange to double the
5289 if (temp[seglen] == '\0') { ptr--; break; }
5290 yield = string_cat(yield, &size, &ptr, outsep, 1);
5294 /* Output a separator after the string: we will remove the redundant
5295 final one at the end. */
5297 yield = string_cat(yield, &size, &ptr, outsep, 1);
5298 } /* End of iteration over the list loop */
5300 /* REDUCE has generated no output above: output the final value of
5303 if (item_type == EITEM_REDUCE)
5305 yield = string_cat(yield, &size, &ptr, lookup_value,
5306 Ustrlen(lookup_value));
5307 lookup_value = save_lookup_value; /* Restore $value */
5310 /* FILTER and MAP generate lists: if they have generated anything, remove
5311 the redundant final separator. Even though an empty item at the end of a
5312 list does not count, this is tidier. */
5314 else if (ptr != save_ptr) ptr--;
5316 /* Restore preserved $item */
5318 iterate_item = save_iterate_item;
5323 /* If ${dlfunc support is configured, handle calling dynamically-loaded
5324 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
5325 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
5326 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
5328 #define EXPAND_DLFUNC_MAX_ARGS 8
5331 #ifndef EXPAND_DLFUNC
5332 expand_string_message = US"\"${dlfunc\" encountered, but this facility "
5333 "is not included in this binary";
5336 #else /* EXPAND_DLFUNC */
5339 exim_dlfunc_t *func;
5342 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
5344 if ((expand_forbid & RDO_DLFUNC) != 0)
5346 expand_string_message =
5347 US"dynamically-loaded functions are not permitted";
5351 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
5354 case 1: goto EXPAND_FAILED_CURLY;
5356 case 3: goto EXPAND_FAILED;
5359 /* If skipping, we don't actually do anything */
5361 if (skipping) continue;
5363 /* Look up the dynamically loaded object handle in the tree. If it isn't
5364 found, dlopen() the file and put the handle in the tree for next time. */
5366 t = tree_search(dlobj_anchor, argv[0]);
5369 void *handle = dlopen(CS argv[0], RTLD_LAZY);
5372 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
5373 argv[0], dlerror());
5374 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
5377 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]));
5378 Ustrcpy(t->name, argv[0]);
5379 t->data.ptr = handle;
5380 (void)tree_insertnode(&dlobj_anchor, t);
5383 /* Having obtained the dynamically loaded object handle, look up the
5384 function pointer. */
5386 func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1]);
5389 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
5390 "%s", argv[1], argv[0], dlerror());
5391 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
5395 /* Call the function and work out what to do with the result. If it
5396 returns OK, we have a replacement string; if it returns DEFER then
5397 expansion has failed in a non-forced manner; if it returns FAIL then
5398 failure was forced; if it returns ERROR or any other value there's a
5399 problem, so panic slightly. In any case, assume that the function has
5400 side-effects on the store that must be preserved. */
5404 for (argc = 0; argv[argc] != NULL; argc++);
5405 status = func(&result, argc - 2, &argv[2]);
5408 if (result == NULL) result = US"";
5409 yield = string_cat(yield, &size, &ptr, result, Ustrlen(result));
5414 expand_string_message = result == NULL ? US"(no message)" : result;
5415 if(status == FAIL_FORCED) expand_string_forcedfail = TRUE;
5416 else if(status != FAIL)
5417 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
5418 argv[0], argv[1], status, expand_string_message);
5422 #endif /* EXPAND_DLFUNC */
5425 /* Control reaches here if the name is not recognized as one of the more
5426 complicated expansion items. Check for the "operator" syntax (name terminated
5427 by a colon). Some of the operators have arguments, separated by _ from the
5434 uschar *sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE);
5435 if (sub == NULL) goto EXPAND_FAILED;
5438 /* Owing to an historical mis-design, an underscore may be part of the
5439 operator name, or it may introduce arguments. We therefore first scan the
5440 table of names that contain underscores. If there is no match, we cut off
5441 the arguments and then scan the main table. */
5443 c = chop_match(name, op_table_underscore,
5444 sizeof(op_table_underscore)/sizeof(uschar *));
5448 arg = Ustrchr(name, '_');
5449 if (arg != NULL) *arg = 0;
5450 c = chop_match(name, op_table_main,
5451 sizeof(op_table_main)/sizeof(uschar *));
5452 if (c >= 0) c += sizeof(op_table_underscore)/sizeof(uschar *);
5453 if (arg != NULL) *arg++ = '_'; /* Put back for error messages */
5456 /* If we are skipping, we don't need to perform the operation at all.
5457 This matters for operations like "mask", because the data may not be
5458 in the correct format when skipping. For example, the expression may test
5459 for the existence of $sender_host_address before trying to mask it. For
5460 other operations, doing them may not fail, but it is a waste of time. */
5462 if (skipping && c >= 0) continue;
5464 /* Otherwise, switch on the operator type */
5471 unsigned long int n = Ustrtoul(sub, &t, 10);
5474 expand_string_message = string_sprintf("argument for base62 "
5475 "operator is \"%s\", which is not a decimal number", sub);
5478 t = string_base62(n);
5479 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
5483 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
5489 unsigned long int n = 0;
5492 uschar *t = Ustrchr(base62_chars, *tt++);
5495 expand_string_message = string_sprintf("argument for base62d "
5496 "operator is \"%s\", which is not a base %d number", sub,
5500 n = n * BASE_62 + (t - base62_chars);
5502 (void)sprintf(CS buf, "%ld", n);
5503 yield = string_cat(yield, &size, &ptr, buf, Ustrlen(buf));
5509 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE);
5510 if (expanded == NULL)
5512 expand_string_message =
5513 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
5514 expand_string_message);
5517 yield = string_cat(yield, &size, &ptr, expanded, Ustrlen(expanded));
5524 uschar *t = sub - 1;
5525 while (*(++t) != 0) { *t = tolower(*t); count++; }
5526 yield = string_cat(yield, &size, &ptr, sub, count);
5533 uschar *t = sub - 1;
5534 while (*(++t) != 0) { *t = toupper(*t); count++; }
5535 yield = string_cat(yield, &size, &ptr, sub, count);
5546 md5_end(&base, sub, Ustrlen(sub), digest);
5547 for(j = 0; j < 16; j++) sprintf(st+2*j, "%02x", digest[j]);
5548 yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st));
5559 sha1_end(&base, sub, Ustrlen(sub), digest);
5560 for(j = 0; j < 20; j++) sprintf(st+2*j, "%02X", digest[j]);
5561 yield = string_cat(yield, &size, &ptr, US st, (int)strlen(st));
5565 /* Convert hex encoding to base64 encoding */
5575 for (enc = sub; *enc != 0; enc++)
5577 if (!isxdigit(*enc))
5579 expand_string_message = string_sprintf("\"%s\" is not a hex "
5588 expand_string_message = string_sprintf("\"%s\" contains an odd "
5589 "number of characters", sub);
5593 while ((c = *in++) != 0)
5595 if (isdigit(c)) c -= '0';
5596 else c = toupper(c) - 'A' + 10;
5608 enc = auth_b64encode(sub, out - sub);
5609 yield = string_cat(yield, &size, &ptr, enc, Ustrlen(enc));
5613 /* count the number of list elements */
5622 while (string_nextinlist(&sub, &sep, buffer, sizeof(buffer)) != NULL) cnt++;
5623 cp = string_sprintf("%d", cnt);
5624 yield = string_cat(yield, &size, &ptr, cp, Ustrlen(cp));
5628 /* expand a named list given the name */
5629 /* handles nested named lists; requotes as colon-sep list */
5633 tree_node *t = NULL;
5637 uschar * suffix = "";
5638 BOOL needsep = FALSE;
5641 if (*sub == '+') sub++;
5642 if (arg == NULL) /* no-argument version */
5644 if (!(t = tree_search(addresslist_anchor, sub)) &&
5645 !(t = tree_search(domainlist_anchor, sub)) &&
5646 !(t = tree_search(hostlist_anchor, sub)))
5647 t = tree_search(localpartlist_anchor, sub);
5649 else switch(*arg) /* specific list-type version */
5651 case 'a': t = tree_search(addresslist_anchor, sub); suffix = "_a"; break;
5652 case 'd': t = tree_search(domainlist_anchor, sub); suffix = "_d"; break;
5653 case 'h': t = tree_search(hostlist_anchor, sub); suffix = "_h"; break;
5654 case 'l': t = tree_search(localpartlist_anchor, sub); suffix = "_l"; break;
5656 expand_string_message = string_sprintf("bad suffix on \"list\" operator");
5662 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
5664 : *arg=='a'?"address "
5665 : *arg=='d'?"domain "
5667 : *arg=='l'?"localpart "
5672 list = ((namedlist_block *)(t->data.ptr))->string;
5674 while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
5676 uschar * buf = US" : ";
5678 yield = string_cat(yield, &size, &ptr, buf, 3);
5682 if (*item == '+') /* list item is itself a named list */
5684 uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item);
5685 item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE);
5687 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
5691 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
5692 while ((cp= strpbrk((const char *)item, tok)))
5694 yield = string_cat(yield, &size, &ptr, item, cp-(char *)item);
5695 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
5697 yield = string_cat(yield, &size, &ptr, US"::", 2);
5700 else /* sep in item; should already be doubled; emit once */
5702 yield = string_cat(yield, &size, &ptr, (uschar *)tok, 1);
5703 if (*cp == sep) cp++;
5708 yield = string_cat(yield, &size, &ptr, item, Ustrlen(item));
5713 /* mask applies a mask to an IP address; for example the result of
5714 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
5721 int mask, maskoffset;
5722 int type = string_is_ip_address(sub, &maskoffset);
5727 expand_string_message = string_sprintf("\"%s\" is not an IP address",
5732 if (maskoffset == 0)
5734 expand_string_message = string_sprintf("missing mask value in \"%s\"",
5739 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
5741 if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128))
5743 expand_string_message = string_sprintf("mask value too big in \"%s\"",
5748 /* Convert the address to binary integer(s) and apply the mask */
5750 sub[maskoffset] = 0;
5751 count = host_aton(sub, binary);
5752 host_mask(count, binary, mask);
5754 /* Convert to masked textual format and add to output. */
5756 yield = string_cat(yield, &size, &ptr, buffer,
5757 host_nmtoa(count, binary, mask, buffer, '.'));
5762 case EOP_LOCAL_PART:
5766 int start, end, domain;
5767 uschar *t = parse_extract_address(sub, &error, &start, &end, &domain,
5771 if (c != EOP_DOMAIN)
5773 if (c == EOP_LOCAL_PART && domain != 0) end = start + domain - 1;
5774 yield = string_cat(yield, &size, &ptr, sub+start, end-start);
5776 else if (domain != 0)
5779 yield = string_cat(yield, &size, &ptr, sub+domain, end-domain);
5787 uschar outsep[2] = { ':', '\0' };
5788 uschar *address, *error;
5790 int start, end, domain; /* Not really used */
5792 while (isspace(*sub)) sub++;
5793 if (*sub == '>') { *outsep = *++sub; ++sub; }
5794 parse_allow_group = TRUE;
5798 uschar *p = parse_find_address_end(sub, FALSE);
5799 uschar saveend = *p;
5801 address = parse_extract_address(sub, &error, &start, &end, &domain,
5805 /* Add the address to the output list that we are building. This is
5806 done in chunks by searching for the separator character. At the
5807 start, unless we are dealing with the first address of the output
5808 list, add in a space if the new address begins with the separator
5809 character, or is an empty string. */
5811 if (address != NULL)
5813 if (ptr != save_ptr && address[0] == *outsep)
5814 yield = string_cat(yield, &size, &ptr, US" ", 1);
5818 size_t seglen = Ustrcspn(address, outsep);
5819 yield = string_cat(yield, &size, &ptr, address, seglen + 1);
5821 /* If we got to the end of the string we output one character
5824 if (address[seglen] == '\0') { ptr--; break; }
5825 yield = string_cat(yield, &size, &ptr, outsep, 1);
5826 address += seglen + 1;
5829 /* Output a separator after the string: we will remove the
5830 redundant final one at the end. */
5832 yield = string_cat(yield, &size, &ptr, outsep, 1);
5835 if (saveend == '\0') break;
5839 /* If we have generated anything, remove the redundant final
5842 if (ptr != save_ptr) ptr--;
5843 parse_allow_group = FALSE;
5848 /* quote puts a string in quotes if it is empty or contains anything
5849 other than alphamerics, underscore, dot, or hyphen.
5851 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
5852 be quoted in order to be a valid local part.
5854 In both cases, newlines and carriage returns are converted into \n and \r
5858 case EOP_QUOTE_LOCAL_PART:
5861 BOOL needs_quote = (*sub == 0); /* TRUE for empty string */
5862 uschar *t = sub - 1;
5866 while (!needs_quote && *(++t) != 0)
5867 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
5869 else /* EOP_QUOTE_LOCAL_PART */
5871 while (!needs_quote && *(++t) != 0)
5872 needs_quote = !isalnum(*t) &&
5873 strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
5874 (*t != '.' || t == sub || t[1] == 0);
5879 yield = string_cat(yield, &size, &ptr, US"\"", 1);
5884 yield = string_cat(yield, &size, &ptr, US"\\n", 2);
5885 else if (*t == '\r')
5886 yield = string_cat(yield, &size, &ptr, US"\\r", 2);
5889 if (*t == '\\' || *t == '"')
5890 yield = string_cat(yield, &size, &ptr, US"\\", 1);
5891 yield = string_cat(yield, &size, &ptr, t, 1);
5894 yield = string_cat(yield, &size, &ptr, US"\"", 1);
5896 else yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub));
5900 /* quote_lookuptype does lookup-specific quoting */
5905 uschar *opt = Ustrchr(arg, '_');
5907 if (opt != NULL) *opt++ = 0;
5909 n = search_findtype(arg, Ustrlen(arg));
5912 expand_string_message = search_error_message;
5916 if (lookup_list[n]->quote != NULL)
5917 sub = (lookup_list[n]->quote)(sub, opt);
5918 else if (opt != NULL) sub = NULL;
5922 expand_string_message = string_sprintf(
5923 "\"%s\" unrecognized after \"${quote_%s\"",
5928 yield = string_cat(yield, &size, &ptr, sub, Ustrlen(sub));
5932 /* rx quote sticks in \ before any non-alphameric character so that
5933 the insertion works in a regular expression. */
5937 uschar *t = sub - 1;
5941 yield = string_cat(yield, &size, &ptr, US"\\", 1);
5942 yield = string_cat(yield, &size, &ptr, t, 1);
5947 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
5948 prescribed by the RFC, if there are characters that need to be encoded */
5952 uschar buffer[2048];
5953 uschar *string = parse_quote_2047(sub, Ustrlen(sub), headers_charset,
5954 buffer, sizeof(buffer), FALSE);
5955 yield = string_cat(yield, &size, &ptr, string, Ustrlen(string));
5959 /* RFC 2047 decode */
5965 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
5966 headers_charset, '?', &len, &error);
5969 expand_string_message = error;
5972 yield = string_cat(yield, &size, &ptr, decoded, len);
5976 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
5986 if (c > 255) c = '_';
5988 yield = string_cat(yield, &size, &ptr, buff, 1);
5993 /* escape turns all non-printing characters into escape sequences. */
5997 uschar *t = string_printing(sub);
5998 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
6002 /* Handle numeric expression evaluation */
6007 uschar *save_sub = sub;
6008 uschar *error = NULL;
6009 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
6012 expand_string_message = string_sprintf("error in expression "
6013 "evaluation: %s (after processing \"%.*s\")", error, sub-save_sub,
6017 sprintf(CS var_buffer, PR_EXIM_ARITH, n);
6018 yield = string_cat(yield, &size, &ptr, var_buffer, Ustrlen(var_buffer));
6022 /* Handle time period formating */
6026 int n = readconf_readtime(sub, 0, FALSE);
6029 expand_string_message = string_sprintf("string \"%s\" is not an "
6030 "Exim time interval in \"%s\" operator", sub, name);
6033 sprintf(CS var_buffer, "%d", n);
6034 yield = string_cat(yield, &size, &ptr, var_buffer, Ustrlen(var_buffer));
6038 case EOP_TIME_INTERVAL:
6041 uschar *t = read_number(&n, sub);
6042 if (*t != 0) /* Not A Number*/
6044 expand_string_message = string_sprintf("string \"%s\" is not a "
6045 "positive number in \"%s\" operator", sub, name);
6048 t = readconf_printtime(n);
6049 yield = string_cat(yield, &size, &ptr, t, Ustrlen(t));
6053 /* Convert string to base64 encoding */
6057 uschar *encstr = auth_b64encode(sub, Ustrlen(sub));
6058 yield = string_cat(yield, &size, &ptr, encstr, Ustrlen(encstr));
6062 /* strlen returns the length of the string */
6067 (void)sprintf(CS buff, "%d", Ustrlen(sub));
6068 yield = string_cat(yield, &size, &ptr, buff, Ustrlen(buff));
6072 /* length_n or l_n takes just the first n characters or the whole string,
6073 whichever is the shorter;
6075 substr_m_n, and s_m_n take n characters from offset m; negative m take
6076 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
6077 takes the rest, either to the right or to the left.
6079 hash_n or h_n makes a hash of length n from the string, yielding n
6080 characters from the set a-z; hash_n_m makes a hash of length n, but
6081 uses m characters from the set a-zA-Z0-9.
6083 nhash_n returns a single number between 0 and n-1 (in text form), while
6084 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
6085 between 0 and n-1 and the second between 0 and m-1. */
6105 expand_string_message = string_sprintf("missing values after %s",
6110 /* "length" has only one argument, effectively being synonymous with
6113 if (c == EOP_LENGTH || c == EOP_L)
6119 /* The others have one or two arguments; for "substr" the first may be
6120 negative. The second being negative means "not supplied". */
6125 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
6128 /* Read up to two numbers, separated by underscores */
6133 if (arg != ret && *arg == '_' && pn == &value1)
6137 if (arg[1] != 0) arg++;
6139 else if (!isdigit(*arg))
6141 expand_string_message =
6142 string_sprintf("non-digit after underscore in \"%s\"", name);
6145 else *pn = (*pn)*10 + *arg++ - '0';
6149 /* Perform the required operation */
6152 (c == EOP_HASH || c == EOP_H)?
6153 compute_hash(sub, value1, value2, &len) :
6154 (c == EOP_NHASH || c == EOP_NH)?
6155 compute_nhash(sub, value1, value2, &len) :
6156 extract_substr(sub, value1, value2, &len);
6158 if (ret == NULL) goto EXPAND_FAILED;
6159 yield = string_cat(yield, &size, &ptr, ret, len);
6169 uschar **modetable[3];
6174 if ((expand_forbid & RDO_EXISTS) != 0)
6176 expand_string_message = US"Use of the stat() expansion is not permitted";
6180 if (stat(CS sub, &st) < 0)
6182 expand_string_message = string_sprintf("stat(%s) failed: %s",
6183 sub, strerror(errno));
6187 switch (mode & S_IFMT)
6189 case S_IFIFO: smode[0] = 'p'; break;
6190 case S_IFCHR: smode[0] = 'c'; break;
6191 case S_IFDIR: smode[0] = 'd'; break;
6192 case S_IFBLK: smode[0] = 'b'; break;
6193 case S_IFREG: smode[0] = '-'; break;
6194 default: smode[0] = '?'; break;
6197 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
6198 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
6199 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
6201 for (i = 0; i < 3; i++)
6203 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
6208 s = string_sprintf("mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
6209 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
6210 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
6211 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
6212 (long)st.st_gid, st.st_size, (long)st.st_atime,
6213 (long)st.st_mtime, (long)st.st_ctime);
6214 yield = string_cat(yield, &size, &ptr, s, Ustrlen(s));
6218 /* vaguely random number less than N */
6222 int_eximarith_t max;
6225 max = expand_string_integer(sub, TRUE);
6226 if (expand_string_message != NULL)
6228 s = string_sprintf("%d", vaguely_random_number((int)max));
6229 yield = string_cat(yield, &size, &ptr, s, Ustrlen(s));
6233 /* Reverse IP, including IPv6 to dotted-nibble */
6235 case EOP_REVERSE_IP:
6237 int family, maskptr;
6238 uschar reversed[128];
6240 family = string_is_ip_address(sub, &maskptr);
6243 expand_string_message = string_sprintf(
6244 "reverse_ip() not given an IP address [%s]", sub);
6247 invert_address(reversed, sub);
6248 yield = string_cat(yield, &size, &ptr, reversed, Ustrlen(reversed));
6252 /* Unknown operator */
6255 expand_string_message =
6256 string_sprintf("unknown expansion operator \"%s\"", name);
6261 /* Handle a plain name. If this is the first thing in the expansion, release
6262 the pre-allocated buffer. If the result data is known to be in a new buffer,
6263 newsize will be set to the size of that buffer, and we can just point at that
6264 store instead of copying. Many expansion strings contain just one reference,
6265 so this is a useful optimization, especially for humungous headers
6266 ($message_headers). */
6274 if (resetok) store_reset(yield);
6278 value = find_variable(name, FALSE, skipping, &newsize);
6281 expand_string_message =
6282 string_sprintf("unknown variable in \"${%s}\"", name);
6283 check_variable_error_message(name);
6286 len = Ustrlen(value);
6287 if (yield == NULL && newsize != 0)
6293 else yield = string_cat(yield, &size, &ptr, value, len);
6297 /* Else there's something wrong */
6299 expand_string_message =
6300 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
6301 "in a variable reference)", name);
6305 /* If we hit the end of the string when ket_ends is set, there is a missing
6306 terminating brace. */
6308 if (ket_ends && *s == 0)
6310 expand_string_message = malformed_header?
6311 US"missing } at end of string - could be header name not terminated by colon"
6313 US"missing } at end of string";
6317 /* Expansion succeeded; yield may still be NULL here if nothing was actually
6318 added to the string. If so, set up an empty string. Add a terminating zero. If
6319 left != NULL, return a pointer to the terminator. */
6321 if (yield == NULL) yield = store_get(1);
6323 if (left != NULL) *left = s;
6325 /* Any stacking store that was used above the final string is no longer needed.
6326 In many cases the final string will be the first one that was got and so there
6327 will be optimal store usage. */
6329 if (resetok) store_reset(yield + ptr + 1);
6332 debug_printf("expanding: %.*s\n result: %s\n", (int)(s - string), string,
6334 if (skipping) debug_printf("skipping: result is not used\n");
6338 /* This is the failure exit: easiest to program with a goto. We still need
6339 to update the pointer to the terminator, for cases of nested calls with "fail".
6342 EXPAND_FAILED_CURLY:
6343 expand_string_message = malformed_header?
6344 US"missing or misplaced { or } - could be header name not terminated by colon"
6346 US"missing or misplaced { or }";
6348 /* At one point, Exim reset the store to yield (if yield was not NULL), but
6349 that is a bad idea, because expand_string_message is in dynamic store. */
6352 if (left != NULL) *left = s;
6355 debug_printf("failed to expand: %s\n", string);
6356 debug_printf(" error message: %s\n", expand_string_message);
6357 if (expand_string_forcedfail) debug_printf("failure was forced\n");
6363 /* This is the external function call. Do a quick check for any expansion
6364 metacharacters, and if there are none, just return the input string.
6366 Argument: the string to be expanded
6367 Returns: the expanded string, or NULL if expansion failed; if failure was
6368 due to a lookup deferring, search_find_defer will be TRUE
6372 expand_string(uschar *string)
6374 search_find_defer = FALSE;
6375 malformed_header = FALSE;
6376 return (Ustrpbrk(string, "$\\") == NULL)? string :
6377 expand_string_internal(string, FALSE, NULL, FALSE, TRUE);
6382 /*************************************************
6384 *************************************************/
6386 /* Now and again we want to expand a string and be sure that the result is in a
6387 new bit of store. This function does that.
6389 Argument: the string to be expanded
6390 Returns: the expanded string, always in a new bit of store, or NULL
6394 expand_string_copy(uschar *string)
6396 uschar *yield = expand_string(string);
6397 if (yield == string) yield = string_copy(string);
6403 /*************************************************
6404 * Expand and interpret as an integer *
6405 *************************************************/
6407 /* Expand a string, and convert the result into an integer.
6410 string the string to be expanded
6411 isplus TRUE if a non-negative number is expected
6413 Returns: the integer value, or
6414 -1 for an expansion error ) in both cases, message in
6415 -2 for an integer interpretation error ) expand_string_message
6416 expand_string_message is set NULL for an OK integer
6420 expand_string_integer(uschar *string, BOOL isplus)
6422 int_eximarith_t value;
6423 uschar *s = expand_string(string);
6424 uschar *msg = US"invalid integer \"%s\"";
6427 /* If expansion failed, expand_string_message will be set. */
6429 if (s == NULL) return -1;
6431 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
6432 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
6433 systems, so we set it zero ourselves. */
6436 expand_string_message = NULL; /* Indicates no error */
6438 /* Before Exim 4.64, strings consisting entirely of whitespace compared
6439 equal to 0. Unfortunately, people actually relied upon that, so preserve
6440 the behaviour explicitly. Stripping leading whitespace is a harmless
6441 noop change since strtol skips it anyway (provided that there is a number
6445 while (isspace(*s)) ++s;
6449 debug_printf("treating blank string as number 0\n");
6454 value = strtoll(CS s, CSS &endptr, 10);
6458 msg = US"integer expected but \"%s\" found";
6460 else if (value < 0 && isplus)
6462 msg = US"non-negative integer expected but \"%s\" found";
6466 switch (tolower(*endptr))
6471 if (value > LLONG_MAX/1024 || value < LLONG_MIN/1024) errno = ERANGE;
6476 if (value > LLONG_MAX/(1024*1024) || value < LLONG_MIN/(1024*1024)) errno = ERANGE;
6477 else value *= 1024*1024;
6481 if (value > LLONG_MAX/(1024*1024*1024) || value < LLONG_MIN/(1024*1024*1024)) errno = ERANGE;
6482 else value *= 1024*1024*1024;
6486 if (errno == ERANGE)
6487 msg = US"absolute value of integer \"%s\" is too large (overflow)";
6490 while (isspace(*endptr)) endptr++;
6491 if (*endptr == 0) return (int)value;
6495 expand_string_message = string_sprintf(CS msg, s);
6500 /*************************************************
6501 **************************************************
6502 * Stand-alone test program *
6503 **************************************************
6504 *************************************************/
6510 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
6512 int ovector[3*(EXPAND_MAXN+1)];
6513 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
6514 ovector, sizeof(ovector)/sizeof(int));
6515 BOOL yield = n >= 0;
6516 if (n == 0) n = EXPAND_MAXN + 1;
6520 expand_nmax = (setup < 0)? 0 : setup + 1;
6521 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
6523 expand_nstring[expand_nmax] = subject + ovector[nn];
6524 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
6532 int main(int argc, uschar **argv)
6535 uschar buffer[1024];
6537 debug_selector = D_v;
6538 debug_file = stderr;
6539 debug_fd = fileno(debug_file);
6540 big_buffer = malloc(big_buffer_size);
6542 for (i = 1; i < argc; i++)
6544 if (argv[i][0] == '+')
6546 debug_trace_memory = 2;
6549 if (isdigit(argv[i][0]))
6550 debug_selector = Ustrtol(argv[i], NULL, 0);
6552 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
6556 eldap_default_servers = argv[i];
6559 mysql_servers = argv[i];
6562 pgsql_servers = argv[i];
6566 else opt_perl_startup = argv[i];
6570 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
6572 expand_nstring[1] = US"string 1....";
6573 expand_nlength[1] = 8;
6577 if (opt_perl_startup != NULL)
6580 printf("Starting Perl interpreter\n");
6581 errstr = init_perl(opt_perl_startup);
6584 printf("** error in perl_startup code: %s\n", errstr);
6585 return EXIT_FAILURE;
6588 #endif /* EXIM_PERL */
6590 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
6592 void *reset_point = store_get(0);
6593 uschar *yield = expand_string(buffer);
6596 printf("%s\n", yield);
6597 store_reset(reset_point);
6601 if (search_find_defer) printf("search_find deferred\n");
6602 printf("Failed: %s\n", expand_string_message);
6603 if (expand_string_forcedfail) printf("Forced failure\n");
6615 /* End of expand.c */