1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
252 #ifdef EXPERIMENTAL_SOCKS
253 ,NULL /* socks_proxy */
256 ,NULL, /* tls_certificate */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
282 /* some DSN flags for use later */
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
317 Returns: OK always (FAIL, DEFER not used)
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
327 errmsg = errmsg; /* Keep picky compilers happy */
331 /* Pass back options if required. This interface is getting very messy. */
335 tf->interface = ob->interface;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
351 if (!testflag(addrlist, af_local_host_removed))
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
371 Argument: pointer to the transport instance block
376 smtp_transport_init(transport_instance *tblock)
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
381 /* Retry_use_local_part defaults FALSE if unset */
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
386 /* Set the default port according to the protocol */
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392 /* Set up the setup entry point, to be called before subprocesses for this
395 tblock->setup = smtp_transport_setup;
397 /* Complain if any of the timeouts are zero. */
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
444 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446 this particular type of timeout.
452 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
453 BOOL pass_message, host_item * host)
457 if (errno_value == ERRNO_CONNECTTIMEOUT)
459 errno_value = ETIMEDOUT;
460 orvalue = RTEF_CTOUT;
462 for (addr = addrlist; addr != NULL; addr = addr->next)
463 if (addr->transport_return >= PENDING)
465 addr->basic_errno = errno_value;
466 addr->more_errno |= orvalue;
470 if (pass_message) setflag(addr, af_pass_message);
472 addr->transport_return = rc;
474 addr->host_used = host;
480 /*************************************************
481 * Check an SMTP response *
482 *************************************************/
484 /* This function is given an errno code and the SMTP response buffer
485 to analyse, together with the host identification for generating messages. It
486 sets an appropriate message and puts the first digit of the response code into
487 the yield variable. If no response was actually read, a suitable digit is
491 host the current host, to get its name for messages
492 errno_value pointer to the errno value
493 more_errno from the top address for use with ERRNO_FILTER_FAIL
494 buffer the SMTP response buffer
495 yield where to put a one-digit SMTP response code
496 message where to put an errror message
497 pass_message set TRUE if message is an SMTP response
499 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
503 check_response(host_item *host, int *errno_value, int more_errno,
504 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
508 if (smtp_use_pipelining &&
509 (Ustrcmp(smtp_command, "MAIL") == 0 ||
510 Ustrcmp(smtp_command, "RCPT") == 0 ||
511 Ustrcmp(smtp_command, "DATA") == 0))
514 *yield = '4'; /* Default setting is to give a temporary error */
516 /* Handle response timeout */
518 if (*errno_value == ETIMEDOUT)
520 *message = US string_sprintf("SMTP timeout after %s%s",
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
528 /* Handle malformed SMTP response */
530 if (*errno_value == ERRNO_SMTPFORMAT)
532 const uschar *malfresp = string_printing(buffer);
533 while (isspace(*malfresp)) malfresp++;
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
542 /* Handle a failed filter process error; can't send QUIT as we mustn't
545 if (*errno_value == ERRNO_FILTER_FAIL)
547 *message = US string_sprintf("transport filter process failed (%d)%s",
549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
553 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
556 if (*errno_value == ERRNO_CHHEADER_FAIL)
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
564 /* Handle failure to write a complete data block */
566 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 *message = US string_sprintf("failed to write a data block");
572 #ifdef EXPERIMENTAL_INTERNATIONAL
573 /* Handle lack of advertised SMTPUTF8, for international message */
574 if (*errno_value == ERRNO_UTF8_FWD)
576 *message = US string_sprintf("utf8 support required but not offered for forwarding");
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 /* Handle error responses from the remote mailer. */
586 const uschar *s = string_printing(buffer);
587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
588 "%s", pl, smtp_command, s);
589 *pass_message = TRUE;
594 /* No data was read. If there is no errno, this must be the EOF (i.e.
595 connection closed) case, which causes deferral. An explicit connection reset
596 error has the same effect. Otherwise, put the host's identity in the message,
597 leaving the errno value to be interpreted as well. In all cases, we have to
598 assume the connection is now dead. */
600 if (*errno_value == 0 || *errno_value == ECONNRESET)
602 *errno_value = ERRNO_SMTPCLOSED;
603 *message = US string_sprintf("Remote host closed connection "
604 "in response to %s%s", pl, smtp_command);
606 else *message = US string_sprintf("%s [%s]", host->name, host->address);
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
617 /* This writes to the main log and to the message log.
620 addr the address item containing error information
621 host the current host
627 write_logs(address_item *addr, host_item *host)
629 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
633 message = string_sprintf("%s: %s", message, addr->message);
634 if (addr->basic_errno > 0)
635 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
636 log_write(0, LOG_MAIN, "%s", message);
637 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
641 if (LOGGING(outgoing_port))
642 message = string_sprintf("%s:%d", message,
643 host->port == PORT_NONE ? 25 : host->port);
644 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
645 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
646 strerror(addr->basic_errno));
651 msglog_line(host_item * host, uschar * message)
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
659 #ifdef EXPERIMENTAL_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
668 addr the address item containing error information
669 host the current host
675 deferred_event_raise(address_item *addr, host_item *host)
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
697 (void) event_raise(action, US"msg:host:defer",
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
738 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
754 Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
764 sync_responses(address_item *addrlist, BOOL include_affixes,
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
770 address_item *addr = *sync_addr;
773 /* Handle the response for a MAIL command. On error, reinstate the original
774 command in big_buffer for error message use, and flush any further pending
775 responses before returning, except after I/O errors and timeouts. */
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
782 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
783 if (errno == 0 && buffer[0] != 0)
785 uschar flushbuffer[4096];
787 if (buffer[0] == '4')
789 save_errno = ERRNO_MAIL4XX;
790 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
794 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
796 && (errno != 0 || flushbuffer[0] == 0))
802 if (pending_DATA) count--; /* Number of RCPT responses to come */
803 while (count-- > 0) /* Mark any pending addrs with the host used */
805 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
806 addr->host_used = host;
813 if (pending_DATA) count--; /* Number of RCPT responses to come */
815 /* Read and handle the required number of RCPT responses, matching each one up
816 with an address by scanning for the next address whose status is PENDING_DEFER.
821 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
823 /* The address was accepted */
824 addr->host_used = host;
826 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
829 addr->transport_return = PENDING_OK;
831 /* If af_dr_retry_exists is set, there was a routing delay on this address;
832 ensure that any address-specific retry record is expunged. We do this both
833 for the basic key and for the version that also includes the sender. */
835 if (testflag(addr, af_dr_retry_exists))
837 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
839 retry_add_item(addr, altkey, rf_delete);
840 retry_add_item(addr, addr->address_retry_key, rf_delete);
844 /* Timeout while reading the response */
846 else if (errno == ETIMEDOUT)
848 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
849 transport_rcpt_address(addr, include_affixes));
850 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
851 retry_add_item(addr, addr->address_retry_key, 0);
852 update_waiting = FALSE;
856 /* Handle other errors in obtaining an SMTP response by returning -1. This
857 will cause all the addresses to be deferred. Restore the SMTP command in
858 big_buffer for which we are checking the response, so the error message
861 else if (errno != 0 || buffer[0] == 0)
863 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
864 transport_rcpt_address(addr, include_affixes));
868 /* Handle SMTP permanent and temporary response codes. */
873 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
874 "%s", transport_rcpt_address(addr, include_affixes),
875 string_printing(buffer));
876 setflag(addr, af_pass_message);
877 msglog_line(host, addr->message);
879 /* The response was 5xx */
881 if (buffer[0] == '5')
883 addr->transport_return = FAIL;
887 /* The response was 4xx */
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
893 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
895 /* Log temporary errors if there are more hosts to be tried.
896 If not, log this last one in the == line. */
899 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
901 /* Do not put this message on the list of those waiting for specific
902 hosts, as otherwise it is likely to be tried too often. */
904 update_waiting = FALSE;
906 /* Add a retry item for the address so that it doesn't get tried again
907 too soon. If address_retry_include_sender is true, add the sender address
910 if (address_retry_include_sender)
912 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
914 retry_add_item(addr, altkey, 0);
916 else retry_add_item(addr, addr->address_retry_key, 0);
919 } /* Loop for next RCPT response */
921 /* Update where to start at for the next block of responses, unless we
922 have already handled all the addresses. */
924 if (addr != NULL) *sync_addr = addr->next;
926 /* Handle a response to DATA. If we have not had any good recipients, either
927 previously or in this block, the response is ignored. */
929 if (pending_DATA != 0 &&
930 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
935 if (pending_DATA > 0 || (yield & 1) != 0)
937 if (errno == 0 && buffer[0] == '4')
939 errno = ERRNO_DATA4XX;
940 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
944 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
945 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
946 "is in use and there were no good recipients\n", msg);
949 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
950 present) received 3xx. If any RCPTs were handled and yielded anything other
951 than 4xx, yield will be set non-zero. */
958 /* Do the client side of smtp-level authentication */
961 buffer EHLO response from server (gets overwritten)
962 addrlist chain of potential addresses to deliver
963 host host to deliver to
965 ibp, obp comms channel control blocks
968 OK Success, or failed (but not required): global "smtp_authenticated" set
969 DEFER Failed authentication (and was required)
970 ERROR Internal problem
972 FAIL_SEND Failed communications - transmit
977 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
978 smtp_transport_options_block *ob, BOOL is_esmtp,
979 smtp_inblock *ibp, smtp_outblock *obp)
982 uschar *fail_reason = US"server did not advertise AUTH support";
984 smtp_authenticated = FALSE;
985 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
986 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
988 if (is_esmtp && !regex_AUTH) regex_AUTH =
989 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
992 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
994 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
995 expand_nmax = -1; /* reset */
997 /* Must not do this check until after we have saved the result of the
998 regex match above. */
1000 if (require_auth == OK ||
1001 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1004 fail_reason = US"no common mechanisms were found";
1006 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1008 /* Scan the configured authenticators looking for one which is configured
1009 for use as a client, which is not suppressed by client_condition, and
1010 whose name matches an authentication mechanism supported by the server.
1011 If one is found, attempt to authenticate by calling its client function.
1014 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1018 (au->client_condition != NULL &&
1019 !expand_check_condition(au->client_condition, au->name,
1020 US"client authenticator")))
1022 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1024 (au->client)? "client_condition is false" :
1025 "not configured as a client");
1029 /* Loop to scan supported server mechanisms */
1034 int len = Ustrlen(au->public_name);
1035 while (isspace(*p)) p++;
1037 if (strncmpic(au->public_name, p, len) != 0 ||
1038 (p[len] != 0 && !isspace(p[len])))
1040 while (*p != 0 && !isspace(*p)) p++;
1044 /* Found data for a listed mechanism. Call its client entry. Set
1045 a flag in the outblock so that data is overwritten after sending so
1046 that reflections don't show it. */
1048 fail_reason = US"authentication attempt(s) failed";
1049 obp->authenticating = TRUE;
1050 rc = (au->info->clientcode)(au, ibp, obp,
1051 ob->command_timeout, buffer, bufsize);
1052 obp->authenticating = FALSE;
1053 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1056 /* A temporary authentication failure must hold up delivery to
1057 this host. After a permanent authentication failure, we carry on
1058 to try other authentication methods. If all fail hard, try to
1059 deliver the message unauthenticated unless require_auth was set. */
1064 smtp_authenticated = TRUE; /* stops the outer loop */
1065 client_authenticator = au->name;
1066 if (au->set_client_id != NULL)
1067 client_authenticated_id = expand_string(au->set_client_id);
1070 /* Failure after writing a command */
1075 /* Failure after reading a response */
1078 if (errno != 0 || buffer[0] != '5') return FAIL;
1079 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1080 au->name, host->name, host->address, buffer);
1083 /* Failure by some other means. In effect, the authenticator
1084 decided it wasn't prepared to handle this case. Typically this
1085 is the result of "fail" in an expansion string. Do we need to
1086 log anything here? Feb 2006: a message is now put in the buffer
1087 if logging is required. */
1091 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1092 "authentication H=%s [%s] %s", au->name, host->name,
1093 host->address, buffer);
1096 /* Internal problem, message in buffer. */
1099 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1100 DEFER, FALSE, NULL);
1104 break; /* If not authenticated, try next authenticator */
1105 } /* Loop for scanning supported server mechanisms */
1106 } /* Loop for further authenticators */
1110 /* If we haven't authenticated, but are required to, give up. */
1112 if (require_auth == OK && !smtp_authenticated)
1114 set_errno(addrlist, ERRNO_AUTHFAIL,
1115 string_sprintf("authentication required but %s", fail_reason), DEFER,
1124 /* Construct AUTH appendix string for MAIL TO */
1127 buffer to build string
1128 addrlist chain of potential addresses to deliver
1129 ob transport options
1131 Globals smtp_authenticated
1132 client_authenticated_sender
1133 Return True on error, otherwise buffer has (possibly empty) terminated string
1137 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1138 smtp_transport_options_block *ob)
1140 uschar *local_authenticated_sender = authenticated_sender;
1143 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1146 if (ob->authenticated_sender != NULL)
1148 uschar *new = expand_string(ob->authenticated_sender);
1151 if (!expand_string_forcedfail)
1153 uschar *message = string_sprintf("failed to expand "
1154 "authenticated_sender: %s", expand_string_message);
1155 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1159 else if (new[0] != 0) local_authenticated_sender = new;
1162 /* Add the authenticated sender address if present */
1164 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1165 local_authenticated_sender != NULL)
1167 string_format(buffer, bufsize, " AUTH=%s",
1168 auth_xtextencode(local_authenticated_sender,
1169 Ustrlen(local_authenticated_sender)));
1170 client_authenticated_sender = string_copy(local_authenticated_sender);
1180 #ifdef EXPERIMENTAL_DANE
1182 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1183 BOOL dane_required, BOOL * dane)
1185 /* move this out to host.c given the similarity to dns_lookup() ? */
1187 const uschar * fullname = buffer;
1189 /* TLSA lookup string */
1190 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1192 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1195 return DEFER; /* just defer this TLS'd conn */
1204 if (!dns_is_secure(dnsa))
1206 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 typedef struct smtp_compare_s
1220 uschar *current_sender_address;
1221 struct transport_instance *tblock;
1225 Create a unique string that identifies this message, it is based on
1226 sender_address, helo_data and tls_certificate if enabled. */
1229 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1231 address_item * addr1;
1232 uschar * if1 = US"";
1233 uschar * helo1 = US"";
1235 uschar * tlsc1 = US"";
1237 uschar * save_sender_address = sender_address;
1238 uschar * local_identity = NULL;
1239 smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1242 sender_address = sender;
1244 addr1 = deliver_make_addr (sender, TRUE);
1245 deliver_set_expansions(addr1);
1248 if1 = expand_string(ob->interface);
1251 helo1 = expand_string(ob->helo_data);
1254 if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1258 local_identity = string_sprintf ("%s^%s", if1, helo1);
1261 deliver_set_expansions(NULL);
1262 sender_address = save_sender_address;
1264 return local_identity;
1269 /* This routine is a callback that is called from transport_check_waiting.
1270 This function will evaluate the incoming message versus the previous
1271 message. If the incoming message is using a different local identity then
1272 we will veto this new message. */
1275 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1278 uschar * message_local_identity,
1279 * current_local_identity,
1280 * new_sender_address;
1282 current_local_identity =
1283 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1285 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1288 message_local_identity =
1289 smtp_local_identity(new_sender_address, s_compare->tblock);
1291 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1296 /*************************************************
1297 * Deliver address list to given host *
1298 *************************************************/
1300 /* If continue_hostname is not null, we get here only when continuing to
1301 deliver down an existing channel. The channel was passed as the standard
1302 input. TLS is never active on a passed channel; the previous process always
1303 closes it down before passing the connection on.
1305 Otherwise, we have to make a connection to the remote host, and do the
1306 initial protocol exchange.
1308 When running as an MUA wrapper, if the sender or any recipient is rejected,
1309 temporarily or permanently, we force failure for all recipients.
1312 addrlist chain of potential addresses to deliver; only those whose
1313 transport_return field is set to PENDING_DEFER are currently
1314 being processed; others should be skipped - they have either
1315 been delivered to an earlier host or IP address, or been
1316 failed by one of them.
1317 host host to deliver to
1318 host_af AF_INET or AF_INET6
1319 port default TCP/IP port to use, in host byte order
1320 interface interface to bind to, or NULL
1321 tblock transport instance block
1322 message_defer set TRUE if yield is OK, but all addresses were deferred
1323 because of a non-recipient, non-host failure, that is, a
1324 4xx response to MAIL FROM, DATA, or ".". This is a defer
1325 that is specific to the message.
1326 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1327 a second attempt after TLS initialization fails
1329 Returns: OK - the connection was made and the delivery attempted;
1330 the result for each address is in its data block.
1331 DEFER - the connection could not be made, or something failed
1332 while setting up the SMTP session, or there was a
1333 non-message-specific error, such as a timeout.
1334 ERROR - a filter command is specified for this transport,
1335 and there was a problem setting it up; OR helo_data
1336 or add_headers or authenticated_sender is specified
1337 for this transport, and the string failed to expand
1341 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1342 uschar *interface, transport_instance *tblock,
1343 BOOL *message_defer, BOOL suppress_tls)
1346 address_item *sync_addr;
1347 address_item *first_addr = addrlist;
1352 time_t start_delivery_time = time(NULL);
1353 smtp_transport_options_block *ob =
1354 (smtp_transport_options_block *)(tblock->options_block);
1355 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1356 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1358 BOOL send_rset = TRUE;
1359 BOOL send_quit = TRUE;
1360 BOOL setting_up = TRUE;
1361 BOOL completed_address = FALSE;
1364 BOOL pass_message = FALSE;
1365 #ifndef DISABLE_PRDR
1366 BOOL prdr_offered = FALSE;
1369 #ifdef EXPERIMENTAL_INTERNATIONAL
1370 BOOL utf8_needed = FALSE;
1371 BOOL utf8_offered = FALSE;
1373 BOOL dsn_all_lasthop = TRUE;
1374 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1376 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1377 dns_answer tlsa_dnsa;
1379 smtp_inblock inblock;
1380 smtp_outblock outblock;
1381 int max_rcpt = tblock->max_addresses;
1382 uschar *igquotstr = US"";
1384 uschar *helo_data = NULL;
1386 uschar *message = NULL;
1387 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1389 uschar buffer[4096];
1390 uschar inbuffer[4096];
1391 uschar outbuffer[4096];
1393 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1395 *message_defer = FALSE;
1396 smtp_command = US"initial connection";
1397 if (max_rcpt == 0) max_rcpt = 999999;
1399 /* Set up the buffer for reading SMTP response packets. */
1401 inblock.buffer = inbuffer;
1402 inblock.buffersize = sizeof(inbuffer);
1403 inblock.ptr = inbuffer;
1404 inblock.ptrend = inbuffer;
1406 /* Set up the buffer for holding SMTP commands while pipelining */
1408 outblock.buffer = outbuffer;
1409 outblock.buffersize = sizeof(outbuffer);
1410 outblock.ptr = outbuffer;
1411 outblock.cmd_count = 0;
1412 outblock.authenticating = FALSE;
1414 /* Reset the parameters of a TLS session. */
1417 tls_out.cipher = NULL; /* the one we may use for this transport */
1418 tls_out.ourcert = NULL;
1419 tls_out.peercert = NULL;
1420 tls_out.peerdn = NULL;
1421 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1424 tls_out.ocsp = OCSP_NOT_REQ;
1426 /* Flip the legacy TLS-related variables over to the outbound set in case
1427 they're used in the context of the transport. Don't bother resetting
1428 afterward as we're in a subprocess. */
1430 tls_modify_variables(&tls_out);
1435 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1436 DEFER, FALSE, NULL);
1441 /* Make a connection to the host if this isn't a continued delivery, and handle
1442 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1443 specially so they can be identified for retries. */
1445 if (continue_hostname == NULL)
1447 /* This puts port into host->port */
1448 inblock.sock = outblock.sock =
1449 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1451 if (inblock.sock < 0)
1453 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1454 NULL, DEFER, FALSE, NULL);
1458 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1460 tls_out.dane_verified = FALSE;
1461 tls_out.tlsa_usage = 0;
1463 if (host->dnssec == DS_YES)
1466 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1468 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1469 && dane_required /* do not error on only dane-requested */
1472 set_errno(addrlist, ERRNO_DNSDEFER,
1473 string_sprintf("DANE error: tlsa lookup %s",
1474 rc == DEFER ? "DEFER" : "FAIL"),
1479 else if (dane_required)
1481 set_errno(addrlist, ERRNO_DNSDEFER,
1482 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1488 ob->tls_tempfail_tryclear = FALSE;
1492 /* Expand the greeting message while waiting for the initial response. (Makes
1493 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1494 delayed till here so that $sending_interface and $sending_port are set. */
1496 helo_data = expand_string(ob->helo_data);
1497 #ifdef EXPERIMENTAL_INTERNATIONAL
1500 uschar * errstr = NULL;
1501 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1503 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1504 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1511 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1512 is nevertheless a reasonably clean way of programming this kind of logic,
1513 where you want to escape on any error. */
1517 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1518 ob->command_timeout)) goto RESPONSE_FAILED;
1520 #ifdef EXPERIMENTAL_EVENT
1523 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1524 : host->dnssec==DS_NO ? US"no" : NULL;
1525 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1528 set_errno(addrlist, ERRNO_EXPANDFAIL,
1529 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1530 DEFER, FALSE, NULL);
1537 /* Now check if the helo_data expansion went well, and sign off cleanly if
1540 if (helo_data == NULL)
1542 uschar *message = string_sprintf("failed to expand helo_data: %s",
1543 expand_string_message);
1544 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1550 /** Debugging without sending a message
1551 addrlist->transport_return = DEFER;
1555 /* Errors that occur after this point follow an SMTP command, which is
1556 left in big_buffer by smtp_write_command() for use in error messages. */
1558 smtp_command = big_buffer;
1560 /* Tell the remote who we are...
1562 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1563 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1564 greeting is of this form. The assumption was that the far end supports it
1565 properly... but experience shows that there are some that give 5xx responses,
1566 even though the banner includes "ESMTP" (there's a bloody-minded one that
1567 says "ESMTP not spoken here"). Cope with that case.
1569 September 2000: Time has passed, and it seems reasonable now to always send
1570 EHLO at the start. It is also convenient to make the change while installing
1573 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1574 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1575 would be no way to send out the mails, so there is now a host list
1576 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1577 PIPELINING problem as well. Maybe it can also be useful to cure other
1578 problems with broken servers.
1580 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1581 Then somebody tried it with a Microsoft mailer... It seems that all other
1582 mailers use upper case for some reason (the RFC is quite clear about case
1583 independence) so, for peace of mind, I gave in. */
1585 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1587 /* Alas; be careful, since this goto is not an error-out, so conceivably
1588 we might set data between here and the target which we assume to exist
1589 and be usable. I can see this coming back to bite us. */
1594 suppress_tls = FALSE;
1595 ob->tls_tempfail_tryclear = FALSE;
1596 smtp_command = US"SSL-on-connect";
1603 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1604 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1606 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1607 ob->command_timeout))
1609 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1616 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1621 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1623 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1624 ob->command_timeout)) goto RESPONSE_FAILED;
1627 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1628 lmtp_ignore_quota option was set. */
1630 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1631 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1632 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1634 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1637 tls_offered = esmtp &&
1638 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1639 PCRE_EOPT, NULL, 0) >= 0;
1642 #ifndef DISABLE_PRDR
1643 prdr_offered = esmtp
1644 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1645 PCRE_EOPT, NULL, 0) >= 0
1646 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1649 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1652 #ifdef EXPERIMENTAL_INTERNATIONAL
1653 if (addrlist->prop.utf8_msg)
1655 utf8_needed = !addrlist->prop.utf8_downcvt
1656 && !addrlist->prop.utf8_downcvt_maybe;
1657 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1658 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1660 utf8_offered = esmtp
1661 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1662 PCRE_EOPT, NULL, 0) >= 0;
1667 /* For continuing deliveries down the same channel, the socket is the standard
1668 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1669 below). Set up the pointer to where subsequent commands will be left, for
1670 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1671 set from the command line if they were set in the process that passed the
1676 inblock.sock = outblock.sock = fileno(stdin);
1677 smtp_command = big_buffer;
1678 host->port = port; /* Record the port that was used */
1681 /* If TLS is available on this connection, whether continued or not, attempt to
1682 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1683 send another EHLO - the server may give a different answer in secure mode. We
1684 use a separate buffer for reading the response to STARTTLS so that if it is
1685 negative, the original EHLO data is available for subsequent analysis, should
1686 the client not be required to use TLS. If the response is bad, copy the buffer
1687 for error analysis. */
1692 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1694 uschar buffer2[4096];
1695 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1698 /* If there is an I/O error, transmission of this message is deferred. If
1699 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1700 false, we also defer. However, if there is a temporary rejection of STARTTLS
1701 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1702 STARTTLS, we carry on. This means we will try to send the message in clear,
1703 unless the host is in hosts_require_tls (tested below). */
1705 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1706 ob->command_timeout))
1708 if (errno != 0 || buffer2[0] == 0 ||
1709 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1711 Ustrncpy(buffer, buffer2, sizeof(buffer));
1712 goto RESPONSE_FAILED;
1716 /* STARTTLS accepted: try to negotiate a TLS session. */
1721 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1722 # ifdef EXPERIMENTAL_DANE
1723 , dane ? &tlsa_dnsa : NULL
1727 /* TLS negotiation failed; give an error. From outside, this function may
1728 be called again to try in clear on a new connection, if the options permit
1729 it for this host. */
1733 # ifdef EXPERIMENTAL_DANE
1734 if (rc == DEFER && dane && !dane_required)
1736 log_write(0, LOG_MAIN, "DANE attempt failed;"
1737 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1738 host->name, host->address);
1744 save_errno = ERRNO_TLSFAILURE;
1745 message = US"failure while setting up TLS session";
1750 /* TLS session is set up */
1752 for (addr = addrlist; addr != NULL; addr = addr->next)
1753 if (addr->transport_return == PENDING_DEFER)
1755 addr->cipher = tls_out.cipher;
1756 addr->ourcert = tls_out.ourcert;
1757 addr->peercert = tls_out.peercert;
1758 addr->peerdn = tls_out.peerdn;
1759 addr->ocsp = tls_out.ocsp;
1764 /* if smtps, we'll have smtp_command set to something else; always safe to
1766 smtp_command = big_buffer;
1768 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1769 helo_data is null, we are dealing with a connection that was passed from
1770 another process, and so we won't have expanded helo_data above. We have to
1771 expand it here. $sending_ip_address and $sending_port are set up right at the
1772 start of the Exim process (in exim.c). */
1774 if (tls_out.active >= 0)
1777 if (helo_data == NULL)
1779 helo_data = expand_string(ob->helo_data);
1780 if (helo_data == NULL)
1782 uschar *message = string_sprintf("failed to expand helo_data: %s",
1783 expand_string_message);
1784 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1790 /* For SMTPS we need to wait for the initial OK response. */
1793 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1794 ob->command_timeout)) goto RESPONSE_FAILED;
1798 greeting_cmd = "EHLO";
1801 greeting_cmd = "HELO";
1803 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1806 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1807 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1809 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1810 ob->command_timeout))
1811 goto RESPONSE_FAILED;
1814 /* If the host is required to use a secure channel, ensure that we
1818 # ifdef EXPERIMENTAL_DANE
1821 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1824 save_errno = ERRNO_TLSREQUIRED;
1825 message = string_sprintf("a TLS session is required, but %s",
1826 tls_offered? "an attempt to start TLS failed" :
1827 "the server did not offer TLS support");
1830 #endif /*SUPPORT_TLS*/
1832 /* If TLS is active, we have just started it up and re-done the EHLO command,
1833 so its response needs to be analyzed. If TLS is not active and this is a
1834 continued session down a previously-used socket, we haven't just done EHLO, so
1837 if (continue_hostname == NULL
1839 || tls_out.active >= 0
1843 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1844 lmtp_ignore_quota option was set. */
1846 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1847 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1848 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1850 /* If the response to EHLO specified support for the SIZE parameter, note
1851 this, provided size_addition is non-negative. */
1853 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1854 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1855 PCRE_EOPT, NULL, 0) >= 0;
1857 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1858 the current host, esmtp will be false, so PIPELINING can never be used. If
1859 the current host matches hosts_avoid_pipelining, don't do it. */
1861 smtp_use_pipelining = esmtp
1862 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1863 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1864 PCRE_EOPT, NULL, 0) >= 0;
1866 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1867 smtp_use_pipelining? "" : "not ");
1869 #ifndef DISABLE_PRDR
1870 prdr_offered = esmtp
1871 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1872 PCRE_EOPT, NULL, 0) >= 0
1873 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1876 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1879 #ifdef EXPERIMENTAL_INTERNATIONAL
1880 if (addrlist->prop.utf8_msg)
1881 utf8_offered = esmtp
1882 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1883 PCRE_EOPT, NULL, 0) >= 0;
1886 /* Note if the server supports DSN */
1887 smtp_use_dsn = esmtp
1888 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1889 PCRE_EOPT, NULL, 0) >= 0;
1890 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1892 /* Note if the response to EHLO specifies support for the AUTH extension.
1893 If it has, check that this host is one we want to authenticate to, and do
1894 the business. The host name and address must be available when the
1895 authenticator's client driver is running. */
1897 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1898 ob, esmtp, &inblock, &outblock))
1900 default: goto SEND_QUIT;
1902 case FAIL_SEND: goto SEND_FAILED;
1903 case FAIL: goto RESPONSE_FAILED;
1907 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1908 message-specific. */
1912 #ifdef EXPERIMENTAL_INTERNATIONAL
1913 /* If this is an international message we need the host to speak SMTPUTF8 */
1914 if (utf8_needed && !utf8_offered)
1916 errno = ERRNO_UTF8_FWD;
1917 goto RESPONSE_FAILED;
1921 /* If there is a filter command specified for this transport, we can now
1922 set it up. This cannot be done until the identify of the host is known. */
1924 if (tblock->filter_command != NULL)
1928 sprintf(CS buffer, "%.50s transport", tblock->name);
1929 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1930 TRUE, DEFER, addrlist, buffer, NULL);
1931 transport_filter_timeout = tblock->filter_timeout;
1933 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1938 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1946 /* For messages that have more than the maximum number of envelope recipients,
1947 we want to send several transactions down the same SMTP connection. (See
1948 comments in deliver.c as to how this reconciles, heuristically, with
1949 remote_max_parallel.) This optimization was added to Exim after the following
1950 code was already working. The simplest way to put it in without disturbing the
1951 code was to use a goto to jump back to this point when there is another
1952 transaction to handle. */
1955 sync_addr = first_addr;
1959 completed_address = FALSE;
1962 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1963 qualification, send it, adding something to the message size to allow for
1964 imprecision and things that get added en route. Exim keeps the number of lines
1965 in a message, so we can give an accurate value for the original message, but we
1966 need some additional to handle added headers. (Double "." characters don't get
1967 included in the count.) */
1974 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1978 #ifndef DISABLE_PRDR
1979 prdr_active = FALSE;
1982 for (addr = first_addr; addr; addr = addr->next)
1983 if (addr->transport_return == PENDING_DEFER)
1985 for (addr = addr->next; addr; addr = addr->next)
1986 if (addr->transport_return == PENDING_DEFER)
1987 { /* at least two recipients to send */
1989 sprintf(CS p, " PRDR"); p += 5;
1997 #ifdef EXPERIMENTAL_INTERNATIONAL
1998 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1999 sprintf(CS p, " SMTPUTF8"), p += 9;
2002 /* check if all addresses have lasthop flag */
2003 /* do not send RET and ENVID if true */
2004 for (dsn_all_lasthop = TRUE, addr = first_addr;
2005 address_count < max_rcpt && addr != NULL;
2007 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2009 dsn_all_lasthop = FALSE;
2013 /* Add any DSN flags to the mail command */
2015 if (smtp_use_dsn && !dsn_all_lasthop)
2017 if (dsn_ret == dsn_ret_hdrs)
2019 Ustrcpy(p, " RET=HDRS");
2022 else if (dsn_ret == dsn_ret_full)
2024 Ustrcpy(p, " RET=FULL");
2027 if (dsn_envid != NULL)
2029 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2034 /* If an authenticated_sender override has been specified for this transport
2035 instance, expand it. If the expansion is forced to fail, and there was already
2036 an authenticated_sender for this message, the original value will be used.
2037 Other expansion failures are serious. An empty result is ignored, but there is
2038 otherwise no check - this feature is expected to be used with LMTP and other
2039 cases where non-standard addresses (e.g. without domains) might be required. */
2041 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2047 /* From here until we send the DATA command, we can make use of PIPELINING
2048 if the server host supports it. The code has to be able to check the responses
2049 at any point, for when the buffer fills up, so we write it totally generally.
2050 When PIPELINING is off, each command written reports that it has flushed the
2053 pending_MAIL = TRUE; /* The block starts with MAIL */
2056 uschar * s = return_path;
2057 #ifdef EXPERIMENTAL_INTERNATIONAL
2058 uschar * errstr = NULL;
2060 /* If we must downconvert, do the from-address here. Remember we had to
2061 for the to-addresses (done below), and also (ugly) for re-doing when building
2062 the delivery log line. */
2064 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2066 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2068 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2072 setflag(addrlist, af_utf8_downcvt);
2076 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2077 "MAIL FROM:<%s>%s\r\n", s, buffer);
2080 mail_command = string_copy(big_buffer); /* Save for later error message */
2084 case -1: /* Transmission error */
2087 case +1: /* Block was sent */
2088 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2089 ob->command_timeout))
2091 if (errno == 0 && buffer[0] == '4')
2093 errno = ERRNO_MAIL4XX;
2094 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2096 goto RESPONSE_FAILED;
2098 pending_MAIL = FALSE;
2102 /* Pass over all the relevant recipient addresses for this host, which are the
2103 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2104 several before we have to read the responses for those seen so far. This
2105 checking is done by a subroutine because it also needs to be done at the end.
2106 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2107 the next one if not all are sent.
2109 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2110 last address because we want to abort if any recipients have any kind of
2111 problem, temporary or permanent. We know that all recipient addresses will have
2112 the PENDING_DEFER status, because only one attempt is ever made, and we know
2113 that max_rcpt will be large, so all addresses will be done at once. */
2115 for (addr = first_addr;
2116 address_count < max_rcpt && addr != NULL;
2123 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2125 if (addr->transport_return != PENDING_DEFER) continue;
2128 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2130 /* Add any DSN flags to the rcpt command and add to the sent string */
2135 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2137 if ((addr->dsn_flags & rf_dsnflags) != 0)
2141 Ustrcpy(p, " NOTIFY=");
2143 for (i = 0; i < 4; i++)
2144 if ((addr->dsn_flags & rf_list[i]) != 0)
2146 if (!first) *p++ = ',';
2148 Ustrcpy(p, rf_names[i]);
2153 if (addr->dsn_orcpt != NULL)
2155 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2161 /* Now send the RCPT command, and process outstanding responses when
2162 necessary. After a timeout on RCPT, we just end the function, leaving the
2163 yield as OK, because this error can often mean that there is a problem with
2164 just one address, so we don't want to delay the host. */
2166 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2168 #ifdef EXPERIMENTAL_INTERNATIONAL
2170 uschar * dummy_errstr;
2171 if ( testflag(addrlist, af_utf8_downcvt)
2172 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2176 errno = ERRNO_EXPANDFAIL;
2182 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2183 rcpt_addr, igquotstr, buffer);
2185 if (count < 0) goto SEND_FAILED;
2188 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2189 &sync_addr, host, count, ob->address_retry_include_sender,
2190 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2193 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2194 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2197 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2198 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2199 case 0: /* No 2xx or 5xx, but no probs */
2202 case -1: goto END_OFF; /* Timeout on RCPT */
2203 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2205 pending_MAIL = FALSE; /* Dealt with MAIL */
2207 } /* Loop for next address */
2209 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2210 permanently or temporarily. We should have flushed and synced after the last
2215 address_item *badaddr;
2216 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2217 if (badaddr->transport_return != PENDING_OK)
2219 /*XXX could we find a better errno than 0 here? */
2220 set_errno(addrlist, 0, badaddr->message, FAIL,
2221 testflag(badaddr, af_pass_message), NULL);
2227 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2228 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2229 have a good recipient buffered up if we are pipelining. We don't want to waste
2230 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2231 are pipelining. The responses are all handled by sync_responses(). */
2233 if (ok || (smtp_use_pipelining && !mua_wrapper))
2235 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2236 if (count < 0) goto SEND_FAILED;
2237 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2238 host, count, ob->address_retry_include_sender, pending_MAIL,
2239 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2241 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2242 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2245 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2246 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2247 case 0: break; /* No 2xx or 5xx, but no probs */
2249 case -1: goto END_OFF; /* Timeout on RCPT */
2250 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2254 /* Save the first address of the next batch. */
2258 /* If there were no good recipients (but otherwise there have been no
2259 problems), just set ok TRUE, since we have handled address-specific errors
2260 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2261 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2262 well as body. Set the appropriate timeout value to be used for each chunk.
2263 (Haven't been able to make it work using select() for writing yet.) */
2265 if (!ok) ok = TRUE; else
2267 sigalrm_seen = FALSE;
2268 transport_write_timeout = ob->data_timeout;
2269 smtp_command = US"sending data block"; /* For error messages */
2270 DEBUG(D_transport|D_v)
2271 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2272 transport_count = 0;
2274 #ifndef DISABLE_DKIM
2275 ok = dkim_transport_write_message(addrlist, inblock.sock,
2276 topt_use_crlf | topt_end_dot | topt_escape_headers |
2277 (tblock->body_only? topt_no_headers : 0) |
2278 (tblock->headers_only? topt_no_body : 0) |
2279 (tblock->return_path_add? topt_add_return_path : 0) |
2280 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2281 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2282 0, /* No size limit */
2283 tblock->add_headers, tblock->remove_headers,
2284 US".", US"..", /* Escaping strings */
2285 tblock->rewrite_rules, tblock->rewrite_existflags,
2286 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2287 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2290 ok = transport_write_message(addrlist, inblock.sock,
2291 topt_use_crlf | topt_end_dot | topt_escape_headers |
2292 (tblock->body_only? topt_no_headers : 0) |
2293 (tblock->headers_only? topt_no_body : 0) |
2294 (tblock->return_path_add? topt_add_return_path : 0) |
2295 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2296 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2297 0, /* No size limit */
2298 tblock->add_headers, tblock->remove_headers,
2299 US".", US"..", /* Escaping strings */
2300 tblock->rewrite_rules, tblock->rewrite_existflags);
2303 /* transport_write_message() uses write() because it is called from other
2304 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2305 it can exit with "Broken pipe" as its error. This really means that the
2306 socket got closed at the far end. */
2308 transport_write_timeout = 0; /* for subsequent transports */
2310 /* Failure can either be some kind of I/O disaster (including timeout),
2311 or the failure of a transport filter or the expansion of added headers. */
2315 buffer[0] = 0; /* There hasn't been a response */
2316 goto RESPONSE_FAILED;
2319 /* We used to send the terminating "." explicitly here, but because of
2320 buffering effects at both ends of TCP/IP connections, you don't gain
2321 anything by keeping it separate, so it might as well go in the final
2322 data buffer for efficiency. This is now done by setting the topt_end_dot
2325 smtp_command = US"end of data";
2327 #ifndef DISABLE_PRDR
2328 /* For PRDR we optionally get a partial-responses warning
2329 * followed by the individual responses, before going on with
2330 * the overall response. If we don't get the warning then deal
2331 * with per non-PRDR. */
2334 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2336 if (!ok && errno == 0)
2339 case '2': prdr_active = FALSE;
2342 case '4': errno = ERRNO_DATA4XX;
2343 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2350 /* For non-PRDR SMTP, we now read a single response that applies to the
2351 whole message. If it is OK, then all the addresses have been delivered. */
2355 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2357 if (!ok && errno == 0 && buffer[0] == '4')
2359 errno = ERRNO_DATA4XX;
2360 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2364 /* For LMTP, we get back a response for every RCPT command that we sent;
2365 some may be accepted and some rejected. For those that get a response, their
2366 status is fixed; any that are accepted have been handed over, even if later
2367 responses crash - at least, that's how I read RFC 2033.
2369 If all went well, mark the recipient addresses as completed, record which
2370 host/IPaddress they were delivered to, and cut out RSET when sending another
2371 message down the same channel. Write the completed addresses to the journal
2372 now so that they are recorded in case there is a crash of hardware or
2373 software before the spool gets updated. Also record the final SMTP
2374 confirmation if needed (for SMTP only). */
2379 int delivery_time = (int)(time(NULL) - start_delivery_time);
2381 uschar *conf = NULL;
2384 /* Set up confirmation if needed - applies only to SMTP */
2387 #ifndef EXPERIMENTAL_EVENT
2388 LOGGING(smtp_confirmation) &&
2393 const uschar *s = string_printing(buffer);
2394 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2395 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2398 /* Process all transported addresses - for LMTP or PRDR, read a status for
2401 for (addr = addrlist; addr != first_addr; addr = addr->next)
2403 if (addr->transport_return != PENDING_OK) continue;
2405 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2406 remaining addresses. Otherwise, it's a return code for just the one
2407 address. For temporary errors, add a retry item for the address so that
2408 it doesn't get tried again too soon. */
2410 #ifndef DISABLE_PRDR
2411 if (lmtp || prdr_active)
2416 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2419 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2420 addr->message = string_sprintf(
2421 #ifndef DISABLE_PRDR
2422 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2424 "LMTP error after %s: %s",
2426 big_buffer, string_printing(buffer));
2427 setflag(addr, af_pass_message); /* Allow message to go to user */
2428 if (buffer[0] == '5')
2429 addr->transport_return = FAIL;
2432 errno = ERRNO_DATA4XX;
2433 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2434 addr->transport_return = DEFER;
2435 #ifndef DISABLE_PRDR
2438 retry_add_item(addr, addr->address_retry_key, 0);
2442 completed_address = TRUE; /* NOW we can set this flag */
2443 if (LOGGING(smtp_confirmation))
2445 const uschar *s = string_printing(buffer);
2446 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2447 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2451 /* SMTP, or success return from LMTP for this address. Pass back the
2452 actual host that was used. */
2454 addr->transport_return = OK;
2455 addr->more_errno = delivery_time;
2456 addr->host_used = host;
2457 addr->special_action = flag;
2458 addr->message = conf;
2459 #ifndef DISABLE_PRDR
2460 if (prdr_active) addr->flags |= af_prdr_used;
2464 #ifndef DISABLE_PRDR
2468 /* Update the journal. For homonymic addresses, use the base address plus
2469 the transport name. See lots of comments in deliver.c about the reasons
2470 for the complications when homonyms are involved. Just carry on after
2471 write error, as it may prove possible to update the spool file later. */
2473 if (testflag(addr, af_homonym))
2474 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2476 sprintf(CS buffer, "%.500s\n", addr->unique);
2478 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2479 len = Ustrlen(CS buffer);
2480 if (write(journal_fd, buffer, len) != len)
2481 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2482 "%s: %s", buffer, strerror(errno));
2486 #ifndef DISABLE_PRDR
2489 /* PRDR - get the final, overall response. For any non-success
2490 upgrade all the address statuses. */
2491 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2495 if(errno == 0 && buffer[0] == '4')
2497 errno = ERRNO_DATA4XX;
2498 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2500 for (addr = addrlist; addr != first_addr; addr = addr->next)
2501 if (buffer[0] == '5' || addr->transport_return == OK)
2502 addr->transport_return = PENDING_OK; /* allow set_errno action */
2503 goto RESPONSE_FAILED;
2506 /* Update the journal, or setup retry. */
2507 for (addr = addrlist; addr != first_addr; addr = addr->next)
2508 if (addr->transport_return == OK)
2510 if (testflag(addr, af_homonym))
2511 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2513 sprintf(CS buffer, "%.500s\n", addr->unique);
2515 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2516 len = Ustrlen(CS buffer);
2517 if (write(journal_fd, buffer, len) != len)
2518 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2519 "%s: %s", buffer, strerror(errno));
2521 else if (addr->transport_return == DEFER)
2522 retry_add_item(addr, addr->address_retry_key, -2);
2526 /* Ensure the journal file is pushed out to disk. */
2528 if (EXIMfsync(journal_fd) < 0)
2529 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2535 /* Handle general (not specific to one address) failures here. The value of ok
2536 is used to skip over this code on the falling through case. A timeout causes a
2537 deferral. Other errors may defer or fail according to the response code, and
2538 may set up a special errno value, e.g. after connection chopped, which is
2539 assumed if errno == 0 and there is no text in the buffer. If control reaches
2540 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2541 the problem is not related to this specific message. */
2550 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2551 buffer, &code, &message, &pass_message);
2557 message = US string_sprintf("send() to %s [%s] failed: %s",
2558 host->name, host->address, strerror(save_errno));
2562 /* This label is jumped to directly when a TLS negotiation has failed,
2563 or was not done for a host for which it is required. Values will be set
2564 in message and save_errno, and setting_up will always be true. Treat as
2565 a temporary error. */
2572 /* If the failure happened while setting up the call, see if the failure was
2573 a 5xx response (this will either be on connection, or following HELO - a 5xx
2574 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2575 never going to accept them. For other errors during setting up (timeouts or
2576 whatever), defer all addresses, and yield DEFER, so that the host is not
2577 tried again for a while. */
2580 ok = FALSE; /* For when reached by GOTO */
2585 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2588 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2593 /* We want to handle timeouts after MAIL or "." and loss of connection after
2594 "." specially. They can indicate a problem with the sender address or with
2595 the contents of the message rather than a real error on the connection. These
2596 cases are treated in the same way as a 4xx response. This next bit of code
2597 does the classification. */
2605 #ifdef EXPERIMENTAL_INTERNATIONAL
2606 case ERRNO_UTF8_FWD:
2613 message_error = TRUE;
2617 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2618 Ustrncmp(smtp_command,"end ",4) == 0;
2621 case ERRNO_SMTPCLOSED:
2622 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2626 message_error = FALSE;
2630 /* Handle the cases that are treated as message errors. These are:
2632 (a) negative response or timeout after MAIL
2633 (b) negative response after DATA
2634 (c) negative response or timeout or dropped connection after "."
2635 (d) utf8 support required and not offered
2637 It won't be a negative response or timeout after RCPT, as that is dealt
2638 with separately above. The action in all cases is to set an appropriate
2639 error code for all the addresses, but to leave yield set to OK because the
2640 host itself has not failed. Of course, it might in practice have failed
2641 when we've had a timeout, but if so, we'll discover that at the next
2642 delivery attempt. For a temporary error, set the message_defer flag, and
2643 write to the logs for information if this is not the last host. The error
2644 for the last host will be logged as part of the address's log line. */
2648 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2649 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2650 pass_message, host);
2652 /* If there's an errno, the message contains just the identity of
2655 if (code != '5') /* Anything other than 5 is treated as temporary */
2658 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2659 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2660 msglog_line(host, message);
2661 *message_defer = TRUE;
2665 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2666 ".", or some other transportation error. We defer all addresses and yield
2667 DEFER, except for the case of failed add_headers expansion, or a transport
2668 filter failure, when the yield should be ERROR, to stop it trying other
2673 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2674 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2675 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2681 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2682 SMTP session tidily. However, if there were too many addresses to send in one
2683 message (indicated by first_addr being non-NULL) we want to carry on with the
2684 rest of them. Also, it is desirable to send more than one message down the SMTP
2685 connection if there are several waiting, provided we haven't already sent so
2686 many as to hit the configured limit. The function transport_check_waiting looks
2687 for a waiting message and returns its id. Then transport_pass_socket tries to
2688 set up a continued delivery by passing the socket on to another process. The
2689 variable send_rset is FALSE if a message has just been successfully transfered.
2691 If we are already sending down a continued channel, there may be further
2692 addresses not yet delivered that are aimed at the same host, but which have not
2693 been passed in this run of the transport. In this case, continue_more will be
2694 true, and all we should do is send RSET if necessary, and return, leaving the
2697 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2698 do not want to continue with other messages down the same channel, because that
2699 can lead to looping between two or more messages, all with the same,
2700 temporarily failing address(es). [The retry information isn't updated yet, so
2701 new processes keep on trying.] We probably also don't want to try more of this
2702 message's addresses either.
2704 If we have started a TLS session, we have to end it before passing the
2705 connection to a new process. However, not all servers can handle this (Exim
2706 can), so we do not pass such a connection on if the host matches
2707 hosts_nopass_tls. */
2710 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2711 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2712 continue_more, yield, (first_addr == NULL)? "":"not ");
2714 if (completed_address && ok && send_quit)
2717 smtp_compare_t t_compare;
2719 t_compare.tblock = tblock;
2720 t_compare.current_sender_address = sender_address;
2722 if ( first_addr != NULL
2724 || ( ( tls_out.active < 0
2725 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2728 transport_check_waiting(tblock->name, host->name,
2729 tblock->connection_max_messages, new_message_id, &more,
2730 (oicf)smtp_are_same_identities, (void*)&t_compare)
2738 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2740 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2741 host->address, strerror(save_errno));
2744 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2745 ob->command_timeout)))
2748 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2752 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2753 host->name, host->address, msg);
2758 /* Either RSET was not needed, or it succeeded */
2762 if (first_addr != NULL) /* More addresses still to be sent */
2763 { /* in this run of the transport */
2764 continue_sequence++; /* Causes * in logging */
2767 if (continue_more) return yield; /* More addresses for another run */
2769 /* Pass the socket to a new Exim process. Before doing so, we must shut
2770 down TLS. Not all MTAs allow for the continuation of the SMTP session
2771 when TLS is shut down. We test for this by sending a new EHLO. If we
2772 don't get a good response, we don't attempt to pass the socket on. */
2775 if (tls_out.active >= 0)
2777 tls_close(FALSE, TRUE);
2781 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2782 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2783 ob->command_timeout);
2787 /* If the socket is successfully passed, we musn't send QUIT (or
2788 indeed anything!) from here. */
2790 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2791 new_message_id, inblock.sock))
2797 /* If RSET failed and there are addresses left, they get deferred. */
2799 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2803 /* End off tidily with QUIT unless the connection has died or the socket has
2804 been passed to another process. There has been discussion on the net about what
2805 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2806 to wait for a response, but on the other hand, there isn't anything one can do
2807 with an error response, other than log it. Exim used to do that. However,
2808 further discussion suggested that it is positively advantageous not to wait for
2809 the response, but to close the session immediately. This is supposed to move
2810 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2811 load from the server. (Hosts that are both servers and clients may not see much
2812 difference, of course.) Further discussion indicated that this was safe to do
2813 on Unix systems which have decent implementations of TCP/IP that leave the
2814 connection around for a while (TIME_WAIT) after the application has gone away.
2815 This enables the response sent by the server to be properly ACKed rather than
2816 timed out, as can happen on broken TCP/IP implementations on other OS.
2818 This change is being made on 31-Jul-98. After over a year of trouble-free
2819 operation, the old commented-out code was removed on 17-Sep-99. */
2822 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2827 tls_close(FALSE, TRUE);
2830 /* Close the socket, and return the appropriate value, first setting
2831 works because the NULL setting is passed back to the calling process, and
2832 remote_max_parallel is forced to 1 when delivering over an existing connection,
2834 If all went well and continue_more is set, we shouldn't actually get here if
2835 there are further addresses, as the return above will be taken. However,
2836 writing RSET might have failed, or there may be other addresses whose hosts are
2837 specified in the transports, and therefore not visible at top level, in which
2838 case continue_more won't get set. */
2840 (void)close(inblock.sock);
2842 #ifdef EXPERIMENTAL_EVENT
2843 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2846 continue_transport = NULL;
2847 continue_hostname = NULL;
2854 /*************************************************
2855 * Closedown entry point *
2856 *************************************************/
2858 /* This function is called when exim is passed an open smtp channel
2859 from another incarnation, but the message which it has been asked
2860 to deliver no longer exists. The channel is on stdin.
2862 We might do fancy things like looking for another message to send down
2863 the channel, but if the one we sought has gone, it has probably been
2864 delivered by some other process that itself will seek further messages,
2865 so just close down our connection.
2867 Argument: pointer to the transport instance block
2872 smtp_transport_closedown(transport_instance *tblock)
2874 smtp_transport_options_block *ob =
2875 (smtp_transport_options_block *)(tblock->options_block);
2876 smtp_inblock inblock;
2877 smtp_outblock outblock;
2879 uschar inbuffer[4096];
2880 uschar outbuffer[16];
2882 inblock.sock = fileno(stdin);
2883 inblock.buffer = inbuffer;
2884 inblock.buffersize = sizeof(inbuffer);
2885 inblock.ptr = inbuffer;
2886 inblock.ptrend = inbuffer;
2888 outblock.sock = inblock.sock;
2889 outblock.buffersize = sizeof(outbuffer);
2890 outblock.buffer = outbuffer;
2891 outblock.ptr = outbuffer;
2892 outblock.cmd_count = 0;
2893 outblock.authenticating = FALSE;
2895 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2896 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2897 ob->command_timeout);
2898 (void)close(inblock.sock);
2903 /*************************************************
2904 * Prepare addresses for delivery *
2905 *************************************************/
2907 /* This function is called to flush out error settings from previous delivery
2908 attempts to other hosts. It also records whether we got here via an MX record
2909 or not in the more_errno field of the address. We are interested only in
2910 addresses that are still marked DEFER - others may have got delivered to a
2911 previously considered IP address. Set their status to PENDING_DEFER to indicate
2912 which ones are relevant this time.
2915 addrlist the list of addresses
2916 host the host we are delivering to
2918 Returns: the first address for this delivery
2921 static address_item *
2922 prepare_addresses(address_item *addrlist, host_item *host)
2924 address_item *first_addr = NULL;
2926 for (addr = addrlist; addr != NULL; addr = addr->next)
2927 if (addr->transport_return == DEFER)
2929 if (first_addr == NULL) first_addr = addr;
2930 addr->transport_return = PENDING_DEFER;
2931 addr->basic_errno = 0;
2932 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2933 addr->message = NULL;
2935 addr->cipher = NULL;
2936 addr->ourcert = NULL;
2937 addr->peercert = NULL;
2938 addr->peerdn = NULL;
2939 addr->ocsp = OCSP_NOT_REQ;
2947 /*************************************************
2948 * Main entry point *
2949 *************************************************/
2951 /* See local README for interface details. As this is a remote transport, it is
2952 given a chain of addresses to be delivered in one connection, if possible. It
2953 always returns TRUE, indicating that each address has its own independent
2954 status set, except if there is a setting up problem, in which case it returns
2958 smtp_transport_entry(
2959 transport_instance *tblock, /* data for this instantiation */
2960 address_item *addrlist) /* addresses we are working on */
2964 int hosts_defer = 0;
2966 int hosts_looked_up = 0;
2967 int hosts_retry = 0;
2968 int hosts_serial = 0;
2969 int hosts_total = 0;
2970 int total_hosts_tried = 0;
2972 BOOL expired = TRUE;
2973 BOOL continuing = continue_hostname != NULL;
2974 uschar *expanded_hosts = NULL;
2976 uschar *tid = string_sprintf("%s transport", tblock->name);
2977 smtp_transport_options_block *ob =
2978 (smtp_transport_options_block *)(tblock->options_block);
2979 host_item *hostlist = addrlist->host_list;
2980 host_item *host = NULL;
2984 debug_printf("%s transport entered\n", tblock->name);
2985 for (addr = addrlist; addr != NULL; addr = addr->next)
2986 debug_printf(" %s\n", addr->address);
2987 if (continuing) debug_printf("already connected to %s [%s]\n",
2988 continue_hostname, continue_host_address);
2991 /* Set the flag requesting that these hosts be added to the waiting
2992 database if the delivery fails temporarily or if we are running with
2993 queue_smtp or a 2-stage queue run. This gets unset for certain
2994 kinds of error, typically those that are specific to the message. */
2996 update_waiting = TRUE;
2998 /* If a host list is not defined for the addresses - they must all have the
2999 same one in order to be passed to a single transport - or if the transport has
3000 a host list with hosts_override set, use the host list supplied with the
3001 transport. It is an error for this not to exist. */
3003 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3005 if (ob->hosts == NULL)
3007 addrlist->message = string_sprintf("%s transport called with no hosts set",
3009 addrlist->transport_return = PANIC;
3010 return FALSE; /* Only top address has status */
3013 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3016 /* If the transport's host list contains no '$' characters, and we are not
3017 randomizing, it is fixed and therefore a chain of hosts can be built once
3018 and for all, and remembered for subsequent use by other calls to this
3019 transport. If, on the other hand, the host list does contain '$', or we are
3020 randomizing its order, we have to rebuild it each time. In the fixed case,
3021 as the hosts string will never be used again, it doesn't matter that we
3022 replace all the : characters with zeros. */
3024 if (ob->hostlist == NULL)
3026 uschar *s = ob->hosts;
3028 if (Ustrchr(s, '$') != NULL)
3030 if (!(expanded_hosts = expand_string(s)))
3032 addrlist->message = string_sprintf("failed to expand list of hosts "
3033 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3034 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3035 return FALSE; /* Only top address has status */
3037 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3038 "\"%s\"\n", s, expanded_hosts);
3042 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3044 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3046 /* Check that the expansion yielded something useful. */
3047 if (hostlist == NULL)
3050 string_sprintf("%s transport has empty hosts setting", tblock->name);
3051 addrlist->transport_return = PANIC;
3052 return FALSE; /* Only top address has status */
3055 /* If there was no expansion of hosts, save the host list for
3058 if (!expanded_hosts) ob->hostlist = hostlist;
3061 /* This is not the first time this transport has been run in this delivery;
3062 the host list was built previously. */
3065 hostlist = ob->hostlist;
3068 /* The host list was supplied with the address. If hosts_randomize is set, we
3069 must sort it into a random order if it did not come from MX records and has not
3070 already been randomized (but don't bother if continuing down an existing
3073 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3075 host_item *newlist = NULL;
3076 while (hostlist != NULL)
3078 host_item *h = hostlist;
3079 hostlist = hostlist->next;
3081 h->sort_key = random_number(100);
3083 if (newlist == NULL)
3088 else if (h->sort_key < newlist->sort_key)
3095 host_item *hh = newlist;
3096 while (hh->next != NULL)
3098 if (h->sort_key < hh->next->sort_key) break;
3106 hostlist = addrlist->host_list = newlist;
3109 /* Sort out the default port. */
3111 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3113 /* For each host-plus-IP-address on the list:
3115 . If this is a continued delivery and the host isn't the one with the
3116 current connection, skip.
3118 . If the status is unusable (i.e. previously failed or retry checked), skip.
3120 . If no IP address set, get the address, either by turning the name into
3121 an address, calling gethostbyname if gethostbyname is on, or by calling
3122 the DNS. The DNS may yield multiple addresses, in which case insert the
3123 extra ones into the list.
3125 . Get the retry data if not previously obtained for this address and set the
3126 field which remembers the state of this address. Skip if the retry time is
3127 not reached. If not, remember whether retry data was found. The retry string
3128 contains both the name and the IP address.
3130 . Scan the list of addresses and mark those whose status is DEFER as
3131 PENDING_DEFER. These are the only ones that will be processed in this cycle
3134 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3135 Some addresses may be successfully delivered, others may fail, and yet
3136 others may get temporary errors and so get marked DEFER.
3138 . The return from the delivery attempt is OK if a connection was made and a
3139 valid SMTP dialogue was completed. Otherwise it is DEFER.
3141 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3143 . If fail to connect, or other defer state, add a retry item.
3145 . If there are any addresses whose status is still DEFER, carry on to the
3146 next host/IPaddress, unless we have tried the number of hosts given
3147 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3148 there is some fancy logic for hosts_max_try that means its limit can be
3149 overstepped in some circumstances.
3151 If we get to the end of the list, all hosts have deferred at least one address,
3152 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3153 delivery attempt to those hosts whose last try was before the arrival time of
3154 the current message. To cope with this, we have to go round the loop a second
3155 time. After that, set the status and error data for any addresses that haven't
3156 had it set already. */
3158 for (cutoff_retry = 0; expired &&
3159 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3162 host_item *nexthost = NULL;
3163 int unexpired_hosts_tried = 0;
3165 for (host = hostlist;
3167 unexpired_hosts_tried < ob->hosts_max_try &&
3168 total_hosts_tried < ob->hosts_max_try_hardlimit;
3174 BOOL serialized = FALSE;
3175 BOOL host_is_expired = FALSE;
3176 BOOL message_defer = FALSE;
3177 BOOL ifchanges = FALSE;
3178 BOOL some_deferred = FALSE;
3179 address_item *first_addr = NULL;
3180 uschar *interface = NULL;
3181 uschar *retry_host_key = NULL;
3182 uschar *retry_message_key = NULL;
3183 uschar *serialize_key = NULL;
3185 /* Default next host is next host. :-) But this can vary if the
3186 hosts_max_try limit is hit (see below). It may also be reset if a host
3187 address is looked up here (in case the host was multihomed). */
3189 nexthost = host->next;
3191 /* If the address hasn't yet been obtained from the host name, look it up
3192 now, unless the host is already marked as unusable. If it is marked as
3193 unusable, it means that the router was unable to find its IP address (in
3194 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3195 the lookup failed last time. We don't get this far if *all* MX records
3196 point to non-existent hosts; that is treated as a hard error.
3198 We can just skip this host entirely. When the hosts came from the router,
3199 the address will timeout based on the other host(s); when the address is
3200 looked up below, there is an explicit retry record added.
3202 Note that we mustn't skip unusable hosts if the address is not unset; they
3203 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3205 if (host->address == NULL)
3207 int new_port, flags;
3210 if (host->status >= hstatus_unusable)
3212 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3217 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3219 /* The host name is permitted to have an attached port. Find it, and
3220 strip it from the name. Just remember it for now. */
3222 new_port = host_item_get_port(host);
3224 /* Count hosts looked up */
3228 /* Find by name if so configured, or if it's an IP address. We don't
3229 just copy the IP address, because we need the test-for-local to happen. */
3231 flags = HOST_FIND_BY_A;
3232 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3233 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3235 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3236 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3238 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3239 &ob->dnssec, /* domains for request/require */
3242 /* Update the host (and any additional blocks, resulting from
3243 multihoming) with a host-specific port, if any. */
3245 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3247 /* Failure to find the host at this time (usually DNS temporary failure)
3248 is really a kind of routing failure rather than a transport failure.
3249 Therefore we add a retry item of the routing kind, not to stop us trying
3250 to look this name up here again, but to ensure the address gets timed
3251 out if the failures go on long enough. A complete failure at this point
3252 commonly points to a configuration error, but the best action is still
3253 to carry on for the next host. */
3255 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3257 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3259 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3260 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3261 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3262 host->status = hstatus_unusable;
3264 for (addr = addrlist; addr != NULL; addr = addr->next)
3266 if (addr->transport_return != DEFER) continue;
3267 addr->basic_errno = ERRNO_UNKNOWNHOST;
3269 string_sprintf("failed to lookup IP address for %s", host->name);
3274 /* If the host is actually the local host, we may have a problem, or
3275 there may be some cunning configuration going on. In the problem case,
3276 log things and give up. The default transport status is already DEFER. */
3278 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3280 for (addr = addrlist; addr != NULL; addr = addr->next)
3282 addr->basic_errno = 0;
3283 addr->message = string_sprintf("%s transport found host %s to be "
3284 "local", tblock->name, host->name);
3288 } /* End of block for IP address lookup */
3290 /* If this is a continued delivery, we are interested only in the host
3291 which matches the name of the existing open channel. The check is put
3292 here after the local host lookup, in case the name gets expanded as a
3293 result of the lookup. Set expired FALSE, to save the outer loop executing
3296 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3297 Ustrcmp(continue_host_address, host->address) != 0))
3300 continue; /* With next host */
3303 /* Reset the default next host in case a multihomed host whose addresses
3304 are not looked up till just above added to the host list. */
3306 nexthost = host->next;
3308 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3309 domain is in queue_smtp_domains, we don't actually want to attempt any
3310 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3311 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3312 were not in it. We don't want to hold up all SMTP deliveries! Except when
3313 doing a two-stage queue run, don't do this if forcing. */
3315 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3316 match_isinlist(addrlist->domain,
3317 (const uschar **)&queue_smtp_domains, 0,
3318 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3321 for (addr = addrlist; addr != NULL; addr = addr->next)
3323 if (addr->transport_return != DEFER) continue;
3324 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3326 continue; /* With next host */
3329 /* Count hosts being considered - purely for an intelligent comment
3330 if none are usable. */
3334 /* Set $host and $host address now in case they are needed for the
3335 interface expansion or the serialize_hosts check; they remain set if an
3336 actual delivery happens. */
3338 deliver_host = host->name;
3339 deliver_host_address = host->address;
3340 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3341 : host->dnssec == DS_NO ? US"no"
3344 /* Set up a string for adding to the retry key if the port number is not
3345 the standard SMTP port. A host may have its own port setting that overrides
3348 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3350 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3352 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3353 string changes upon expansion, we must add it to the key that is used for
3354 retries, because connections to the same host from a different interface
3355 should be treated separately. */
3357 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3358 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3361 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3363 /* The first time round the outer loop, check the status of the host by
3364 inspecting the retry data. The second time round, we are interested only
3365 in expired hosts that haven't been tried since this message arrived. */
3367 if (cutoff_retry == 0)
3370 /* Ensure the status of the address is set by checking retry data if
3371 necessary. There may be host-specific retry data (applicable to all
3372 messages) and also data for retries of a specific message at this host.
3373 If either of these retry records are actually read, the keys used are
3374 returned to save recomputing them later. */
3376 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3377 US"retry_include_ip_address", ob->retry_include_ip_address,
3378 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3379 continue; /* with next host */
3381 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3382 incl_ip, &retry_host_key, &retry_message_key);
3384 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3385 (host->address == NULL)? US"" : host->address, pistring,
3386 (host->status == hstatus_usable)? "usable" :
3387 (host->status == hstatus_unusable)? "unusable" :
3388 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3390 /* Skip this address if not usable at this time, noting if it wasn't
3391 actually expired, both locally and in the address. */
3393 switch (host->status)
3395 case hstatus_unusable:
3397 setflag(addrlist, af_retry_skipped);
3400 case hstatus_unusable_expired:
3403 case hwhy_retry: hosts_retry++; break;
3404 case hwhy_failed: hosts_fail++; break;
3405 case hwhy_deferred: hosts_defer++; break;
3408 /* If there was a retry message key, implying that previously there
3409 was a message-specific defer, we don't want to update the list of
3410 messages waiting for these hosts. */
3412 if (retry_message_key != NULL) update_waiting = FALSE;
3413 continue; /* With the next host or IP address */
3417 /* Second time round the loop: if the address is set but expired, and
3418 the message is newer than the last try, let it through. */
3422 if (host->address == NULL ||
3423 host->status != hstatus_unusable_expired ||
3424 host->last_try > received_time)
3427 debug_printf("trying expired host %s [%s]%s\n",
3428 host->name, host->address, pistring);
3429 host_is_expired = TRUE;
3432 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3433 it remains TRUE only if all hosts are expired and none are actually tried.
3438 /* If this host is listed as one to which access must be serialized,
3439 see if another Exim process has a connection to it, and if so, skip
3440 this host. If not, update the database to record our connection to it
3441 and remember this for later deletion. Do not do any of this if we are
3442 sending the message down a pre-existing connection. */
3445 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3447 serialize_key = string_sprintf("host-serialize-%s", host->name);
3448 if (!enq_start(serialize_key))
3451 debug_printf("skipping host %s because another Exim process "
3452 "is connected to it\n", host->name);
3459 /* OK, we have an IP address that is not waiting for its retry time to
3460 arrive (it might be expired) OR (second time round the loop) we have an
3461 expired host that hasn't been tried since the message arrived. Have a go
3462 at delivering the message to it. First prepare the addresses by flushing
3463 out the result of previous attempts, and finding the first address that
3464 is still to be delivered. */
3466 first_addr = prepare_addresses(addrlist, host);
3468 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3469 message_id, host->name, host->address, addrlist->address,
3470 (addrlist->next == NULL)? "" : ", ...");
3472 set_process_info("delivering %s to %s [%s] (%s%s)",
3473 message_id, host->name, host->address, addrlist->address,
3474 (addrlist->next == NULL)? "" : ", ...");
3476 /* This is not for real; don't do the delivery. If there are
3477 any remaining hosts, list them. */
3482 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3483 for (addr = addrlist; addr != NULL; addr = addr->next)
3485 addr->host_used = host;
3486 addr->special_action = '*';
3487 addr->message = US"delivery bypassed by -N option";
3491 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3492 "*** host and remaining hosts:\n", tblock->name);
3493 for (host2 = host; host2 != NULL; host2 = host2->next)
3494 debug_printf(" %s [%s]\n", host2->name,
3495 (host2->address == NULL)? US"unset" : host2->address);
3500 /* This is for real. If the host is expired, we don't count it for
3501 hosts_max_retry. This ensures that all hosts must expire before an address
3502 is timed out, unless hosts_max_try_hardlimit (which protects against
3503 lunatic DNS configurations) is reached.
3505 If the host is not expired and we are about to hit the hosts_max_retry
3506 limit, check to see if there is a subsequent hosts with a different MX
3507 value. If so, make that the next host, and don't count this one. This is a
3508 heuristic to make sure that different MXs do get tried. With a normal kind
3509 of retry rule, they would get tried anyway when the earlier hosts were
3510 delayed, but if the domain has a "retry every time" type of rule - as is
3511 often used for the the very large ISPs, that won't happen. */
3516 /* Make a copy of the host if it is local to this invocation
3517 of the transport. */
3521 thost = store_get(sizeof(host_item));
3523 thost->name = string_copy(host->name);
3524 thost->address = string_copy(host->address);
3529 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3533 debug_printf("hosts_max_try limit reached with this host\n");
3534 for (h = host; h != NULL; h = h->next)
3535 if (h->mx != host->mx) break;
3539 unexpired_hosts_tried--;
3540 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3541 "and will be tried\n");
3545 /* Attempt the delivery. */
3547 total_hosts_tried++;
3548 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3549 &message_defer, FALSE);
3552 OK => connection made, each address contains its result;
3553 message_defer is set for message-specific defers (when all
3554 recipients are marked defer)
3555 DEFER => there was a non-message-specific delivery problem;
3556 ERROR => there was a problem setting up the arguments for a filter,
3557 or there was a problem with expanding added headers
3560 /* If the result is not OK, there was a non-message-specific problem.
3561 If the result is DEFER, we need to write to the logs saying what happened
3562 for this particular host, except in the case of authentication and TLS
3563 failures, where the log has already been written. If all hosts defer a
3564 general message is written at the end. */
3566 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3567 first_addr->basic_errno != ERRNO_TLSFAILURE)
3568 write_logs(first_addr, host);
3570 #ifdef EXPERIMENTAL_EVENT
3572 deferred_event_raise(first_addr, host);
3575 /* If STARTTLS was accepted, but there was a failure in setting up the
3576 TLS session (usually a certificate screwup), and the host is not in
3577 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3578 TLS forcibly turned off. We have to start from scratch with a new SMTP
3579 connection. That's why the retry is done from here, not from within
3580 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3581 session, so the in-clear transmission after those errors, if permitted,
3582 happens inside smtp_deliver().] */
3586 && first_addr->basic_errno == ERRNO_TLSFAILURE
3587 && ob->tls_tempfail_tryclear
3588 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3591 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3592 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3593 first_addr = prepare_addresses(addrlist, host);
3594 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3595 &message_defer, TRUE);
3596 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3597 write_logs(first_addr, host);
3598 # ifdef EXPERIMENTAL_EVENT
3600 deferred_event_raise(first_addr, host);
3603 #endif /*SUPPORT_TLS*/
3606 /* Delivery attempt finished */
3608 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3611 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3612 message_id, host->name, host->address, addrlist->address,
3613 (addrlist->next == NULL)? "" : " (& others)", rs);
3615 /* Release serialization if set up */
3617 if (serialized) enq_end(serialize_key);
3619 /* If the result is DEFER, or if a host retry record is known to exist, we
3620 need to add an item to the retry chain for updating the retry database
3621 at the end of delivery. We only need to add the item to the top address,
3622 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3623 for any other delivery attempts using the same address. (It is copied into
3624 the unusable tree at the outer level, so even if different address blocks
3625 contain the same address, it still won't get tried again.) */
3627 if (rc == DEFER || retry_host_key != NULL)
3629 int delete_flag = (rc != DEFER)? rf_delete : 0;
3630 if (retry_host_key == NULL)
3633 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3634 US"retry_include_ip_address", ob->retry_include_ip_address,
3635 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3636 incl_ip = TRUE; /* error; use most-specific retry record */
3638 retry_host_key = incl_ip ?
3639 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3640 string_sprintf("T:%S%s", host->name, pistring);
3643 /* If a delivery of another message over an existing SMTP connection
3644 yields DEFER, we do NOT set up retry data for the host. This covers the
3645 case when there are delays in routing the addresses in the second message
3646 that are so long that the server times out. This is alleviated by not
3647 routing addresses that previously had routing defers when handling an
3648 existing connection, but even so, this case may occur (e.g. if a
3649 previously happily routed address starts giving routing defers). If the
3650 host is genuinely down, another non-continued message delivery will
3651 notice it soon enough. */
3653 if (delete_flag != 0 || !continuing)
3654 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3656 /* We may have tried an expired host, if its retry time has come; ensure
3657 the status reflects the expiry for the benefit of any other addresses. */
3661 host->status = (host_is_expired)?
3662 hstatus_unusable_expired : hstatus_unusable;
3663 host->why = hwhy_deferred;
3667 /* If message_defer is set (host was OK, but every recipient got deferred
3668 because of some message-specific problem), or if that had happened
3669 previously so that a message retry key exists, add an appropriate item
3670 to the retry chain. Note that if there was a message defer but now there is
3671 a host defer, the message defer record gets deleted. That seems perfectly
3672 reasonable. Also, stop the message from being remembered as waiting
3673 for specific hosts. */
3675 if (message_defer || retry_message_key != NULL)
3677 int delete_flag = message_defer? 0 : rf_delete;
3678 if (retry_message_key == NULL)
3681 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3682 US"retry_include_ip_address", ob->retry_include_ip_address,
3683 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3684 incl_ip = TRUE; /* error; use most-specific retry record */
3686 retry_message_key = incl_ip ?
3687 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3689 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3691 retry_add_item(addrlist, retry_message_key,
3692 rf_message | rf_host | delete_flag);
3693 update_waiting = FALSE;
3696 /* Any return other than DEFER (that is, OK or ERROR) means that the
3697 addresses have got their final statuses filled in for this host. In the OK
3698 case, see if any of them are deferred. */
3701 for (addr = addrlist; addr; addr = addr->next)
3702 if (addr->transport_return == DEFER)
3704 some_deferred = TRUE;
3708 /* If no addresses deferred or the result was ERROR, return. We do this for
3709 ERROR because a failing filter set-up or add_headers expansion is likely to
3710 fail for any host we try. */
3712 if (rc == ERROR || (rc == OK && !some_deferred))
3714 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3715 return TRUE; /* Each address has its status */
3718 /* If the result was DEFER or some individual addresses deferred, let
3719 the loop run to try other hosts with the deferred addresses, except for the
3720 case when we were trying to deliver down an existing channel and failed.
3721 Don't try any other hosts in this case. */
3723 if (continuing) break;
3725 /* If the whole delivery, or some individual addresses, were deferred and
3726 there are more hosts that could be tried, do not count this host towards
3727 the hosts_max_try limit if the age of the message is greater than the
3728 maximum retry time for this host. This means we may try try all hosts,
3729 ignoring the limit, when messages have been around for some time. This is
3730 important because if we don't try all hosts, the address will never time
3731 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3733 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3736 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3738 if (retry != NULL && retry->rules != NULL)
3740 retry_rule *last_rule;
3741 for (last_rule = retry->rules;
3742 last_rule->next != NULL;
3743 last_rule = last_rule->next);
3744 timedout = time(NULL) - received_time > last_rule->timeout;
3746 else timedout = TRUE; /* No rule => timed out */
3750 unexpired_hosts_tried--;
3751 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3752 "hosts_max_try (message older than host's retry time)\n");
3755 } /* End of loop for trying multiple hosts. */
3757 /* This is the end of the loop that repeats iff expired is TRUE and
3758 ob->delay_after_cutoff is FALSE. The second time round we will
3759 try those hosts that haven't been tried since the message arrived. */
3763 debug_printf("all IP addresses skipped or deferred at least one address\n");
3764 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3765 debug_printf("retrying IP addresses not tried since message arrived\n");
3770 /* Get here if all IP addresses are skipped or defer at least one address. In
3771 MUA wrapper mode, this will happen only for connection or other non-message-
3772 specific failures. Force the delivery status for all addresses to FAIL. */
3776 for (addr = addrlist; addr != NULL; addr = addr->next)
3777 addr->transport_return = FAIL;
3781 /* In the normal, non-wrapper case, add a standard message to each deferred
3782 address if there hasn't been an error, that is, if it hasn't actually been
3783 tried this time. The variable "expired" will be FALSE if any deliveries were
3784 actually tried, or if there was at least one host that was not expired. That
3785 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3786 a delivery has been tried, an error code will be set, and the failing of the
3787 message is handled by the retry code later.
3789 If queue_smtp is set, or this transport was called to send a subsequent message
3790 down an existing TCP/IP connection, and something caused the host not to be
3791 found, we end up here, but can detect these cases and handle them specially. */
3793 for (addr = addrlist; addr != NULL; addr = addr->next)
3795 /* If host is not NULL, it means that we stopped processing the host list
3796 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3797 means we need to behave as if some hosts were skipped because their retry
3798 time had not come. Specifically, this prevents the address from timing out.
3799 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3800 hosts were tried. */
3804 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3807 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3808 "hosts were tried\n");
3813 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3814 setflag(addr, af_retry_skipped);
3818 if (queue_smtp) /* no deliveries attempted */
3820 addr->transport_return = DEFER;
3821 addr->basic_errno = 0;
3822 addr->message = US"SMTP delivery explicitly queued";
3825 else if (addr->transport_return == DEFER &&
3826 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3827 addr->message == NULL)
3829 addr->basic_errno = ERRNO_HRETRY;
3830 if (continue_hostname != NULL)
3832 addr->message = US"no host found for existing SMTP connection";
3836 setflag(addr, af_pass_message); /* This is not a security risk */
3837 addr->message = (ob->delay_after_cutoff)?
3838 US"retry time not reached for any host after a long failure period" :
3839 US"all hosts have been failing for a long time and were last tried "
3840 "after this message arrived";
3842 /* If we are already using fallback hosts, or there are no fallback hosts
3843 defined, convert the result to FAIL to cause a bounce. */
3845 if (addr->host_list == addr->fallback_hosts ||
3846 addr->fallback_hosts == NULL)
3847 addr->transport_return = FAIL;
3851 if (hosts_retry == hosts_total)
3852 addr->message = US"retry time not reached for any host";
3853 else if (hosts_fail == hosts_total)
3854 addr->message = US"all host address lookups failed permanently";
3855 else if (hosts_defer == hosts_total)
3856 addr->message = US"all host address lookups failed temporarily";
3857 else if (hosts_serial == hosts_total)
3858 addr->message = US"connection limit reached for all hosts";
3859 else if (hosts_fail+hosts_defer == hosts_total)
3860 addr->message = US"all host address lookups failed";
3861 else addr->message = US"some host address lookups failed and retry time "
3862 "not reached for other hosts or connection limit reached";
3867 /* Update the database which keeps information about which messages are waiting
3868 for which hosts to become available. For some message-specific errors, the
3869 update_waiting flag is turned off because we don't want follow-on deliveries in
3870 those cases. If this transport instance is explicitly limited to one message
3871 per connection then follow-on deliveries are not possible and there's no need
3872 to create/update the per-transport wait-<transport_name> database. */
3874 if (update_waiting && tblock->connection_max_messages != 1)
3875 transport_update_waiting(hostlist, tblock->name);
3879 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3881 return TRUE; /* Each address has its status */
3886 /* End of transport/smtp.c */