1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
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_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
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, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
250 FALSE, /* lmtp_ignore_quota */
251 NULL, /* expand_retry_include_ip_address */
252 TRUE /* retry_include_ip_address */
253 #ifdef EXPERIMENTAL_SOCKS
254 ,NULL /* socks_proxy */
257 ,NULL, /* tls_certificate */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
265 US"system", /* tls_verify_certificates */
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
270 US"*", /* tls_try_verify_hosts */
271 US"*" /* tls_verify_cert_hostnames */
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
283 /* some DSN flags for use later */
285 static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
288 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
294 static uschar *smtp_command; /* Points to last cmd for error messages */
295 static uschar *mail_command; /* Points to MAIL cmd for error messages */
296 static BOOL update_waiting; /* TRUE to update the "wait" database */
299 /*************************************************
300 * Setup entry point *
301 *************************************************/
303 /* This function is called when the transport is about to be used,
304 but before running it in a sub-process. It is used for two things:
306 (1) To set the fallback host list in addresses, when delivering.
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
316 errmsg place for error message (not used)
318 Returns: OK always (FAIL, DEFER not used)
322 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
325 smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
328 errmsg = errmsg; /* Keep picky compilers happy */
332 /* Pass back options if required. This interface is getting very messy. */
336 tf->interface = ob->interface;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
345 tf->helo_data = ob->helo_data;
348 /* Set the fallback host list for all the addresses that don't have fallback
349 host lists, provided that the local host wasn't present in the original host
352 if (!testflag(addrlist, af_local_host_removed))
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
364 /*************************************************
365 * Initialization entry point *
366 *************************************************/
368 /* Called for each instance, after its options have been read, to
369 enable consistency checks to be done, or anything else that needs
372 Argument: pointer to the transport instance block
377 smtp_transport_init(transport_instance *tblock)
379 smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
382 /* Retry_use_local_part defaults FALSE if unset */
384 if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
387 /* Set the default port according to the protocol */
389 if (ob->port == NULL)
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
393 /* Set up the setup entry point, to be called before subprocesses for this
396 tblock->setup = smtp_transport_setup;
398 /* Complain if any of the timeouts are zero. */
400 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
406 /* If hosts_override is set and there are local hosts, set the global
407 flag that stops verify from showing router hosts. */
409 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
411 /* If there are any fallback hosts listed, build a chain of host items
412 for them, but do not do any lookups at this time. */
414 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
417 if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
430 /*************************************************
431 * Set delivery info into all active addresses *
432 *************************************************/
434 /* Only addresses whose status is >= PENDING are relevant. A lesser
435 status means that an address is not currently being processed.
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
443 host if set, mark addrs as having used this host
445 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447 this particular type of timeout.
453 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
454 BOOL pass_message, host_item * host)
458 if (errno_value == ERRNO_CONNECTTIMEOUT)
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
463 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return >= PENDING)
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
471 if (pass_message) setflag(addr, af_pass_message);
473 addr->transport_return = rc;
475 addr->host_used = host;
481 /*************************************************
482 * Check an SMTP response *
483 *************************************************/
485 /* This function is given an errno code and the SMTP response buffer
486 to analyse, together with the host identification for generating messages. It
487 sets an appropriate message and puts the first digit of the response code into
488 the yield variable. If no response was actually read, a suitable digit is
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
500 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
504 check_response(host_item *host, int *errno_value, int more_errno,
505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
509 if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
515 *yield = '4'; /* Default setting is to give a temporary error */
517 /* Handle response timeout */
519 if (*errno_value == ETIMEDOUT)
521 *message = US string_sprintf("SMTP timeout after %s%s",
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
529 /* Handle malformed SMTP response */
531 if (*errno_value == ERRNO_SMTPFORMAT)
533 const uschar *malfresp = string_printing(buffer);
534 while (isspace(*malfresp)) malfresp++;
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
543 /* Handle a failed filter process error; can't send QUIT as we mustn't
546 if (*errno_value == ERRNO_FILTER_FAIL)
548 *message = US string_sprintf("transport filter process failed (%d)%s",
550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
554 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
557 if (*errno_value == ERRNO_CHHEADER_FAIL)
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
565 /* Handle failure to write a complete data block */
567 if (*errno_value == ERRNO_WRITEINCOMPLETE)
569 *message = US string_sprintf("failed to write a data block");
573 #ifdef EXPERIMENTAL_INTERNATIONAL
574 /* Handle lack of advertised SMTPUTF8, for international message */
575 if (*errno_value == ERRNO_UTF8_FWD)
577 *message = US string_sprintf("utf8 support required but not offered for forwarding");
578 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
583 /* Handle error responses from the remote mailer. */
587 const uschar *s = string_printing(buffer);
588 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
589 "%s", pl, smtp_command, s);
590 *pass_message = TRUE;
595 /* No data was read. If there is no errno, this must be the EOF (i.e.
596 connection closed) case, which causes deferral. An explicit connection reset
597 error has the same effect. Otherwise, put the host's identity in the message,
598 leaving the errno value to be interpreted as well. In all cases, we have to
599 assume the connection is now dead. */
601 if (*errno_value == 0 || *errno_value == ECONNRESET)
603 *errno_value = ERRNO_SMTPCLOSED;
604 *message = US string_sprintf("Remote host closed connection "
605 "in response to %s%s", pl, smtp_command);
607 else *message = US string_sprintf("%s [%s]", host->name, host->address);
614 /*************************************************
615 * Write error message to logs *
616 *************************************************/
618 /* This writes to the main log and to the message log.
621 addr the address item containing error information
622 host the current host
628 write_logs(address_item *addr, host_item *host)
630 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
634 message = string_sprintf("%s: %s", message, addr->message);
635 if (addr->basic_errno > 0)
636 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
637 log_write(0, LOG_MAIN, "%s", message);
638 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
642 if (log_extra_selector & LX_outgoing_port)
643 message = string_sprintf("%s:%d", message,
644 host->port == PORT_NONE ? 25 : host->port);
645 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
647 strerror(addr->basic_errno));
652 msglog_line(host_item * host, uschar * message)
654 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
655 host->name, host->address, message);
660 #ifdef EXPERIMENTAL_EVENT
661 /*************************************************
662 * Post-defer action *
663 *************************************************/
665 /* This expands an arbitrary per-transport string.
666 It might, for example, be used to write to the database log.
669 addr the address item containing error information
670 host the current host
676 deferred_event_raise(address_item *addr, host_item *host)
678 uschar * action = addr->transport->event_action;
679 const uschar * save_domain;
685 save_domain = deliver_domain;
686 save_local = deliver_localpart;
688 /*XXX would ip & port already be set up? */
689 deliver_host_address = string_copy(host->address);
690 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
691 event_defer_errno = addr->basic_errno;
693 router_name = addr->router->name;
694 transport_name = addr->transport->name;
695 deliver_domain = addr->domain;
696 deliver_localpart = addr->local_part;
698 (void) event_raise(action, US"msg:host:defer",
700 ? addr->basic_errno > 0
701 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
702 : string_copy(addr->message)
703 : addr->basic_errno > 0
704 ? string_copy(US strerror(addr->basic_errno))
707 deliver_localpart = save_local;
708 deliver_domain = save_domain;
709 router_name = transport_name = NULL;
713 /*************************************************
714 * Synchronize SMTP responses *
715 *************************************************/
717 /* This function is called from smtp_deliver() to receive SMTP responses from
718 the server, and match them up with the commands to which they relate. When
719 PIPELINING is not in use, this function is called after every command, and is
720 therefore somewhat over-engineered, but it is simpler to use a single scheme
721 that works both with and without PIPELINING instead of having two separate sets
724 The set of commands that are buffered up with pipelining may start with MAIL
725 and may end with DATA; in between are RCPT commands that correspond to the
726 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
727 etc.) are never buffered.
729 Errors after MAIL or DATA abort the whole process leaving the response in the
730 buffer. After MAIL, pending responses are flushed, and the original command is
731 re-instated in big_buffer for error messages. For RCPT commands, the remote is
732 permitted to reject some recipient addresses while accepting others. However
733 certain errors clearly abort the whole process. Set the value in
734 transport_return to PENDING_OK if the address is accepted. If there is a
735 subsequent general error, it will get reset accordingly. If not, it will get
736 converted to OK at the end.
739 addrlist the complete address list
740 include_affixes TRUE if affixes include in RCPT
741 sync_addr ptr to the ptr of the one to start scanning at (updated)
742 host the host we are connected to
743 count the number of responses to read
745 include_sender true if 4xx retry is to include the sender it its key
746 pending_MAIL true if the first response is for MAIL
747 pending_DATA 0 if last command sent was not DATA
748 +1 if previously had a good recipient
749 -1 if not previously had a good recipient
750 inblock incoming SMTP block
751 timeout timeout value
752 buffer buffer for reading response
753 buffsize size of buffer
755 Returns: 3 if at least one address had 2xx and one had 5xx
756 2 if at least one address had 5xx but none had 2xx
757 1 if at least one host had a 2xx response, but none had 5xx
758 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
759 -1 timeout while reading RCPT response
760 -2 I/O or other non-response error for RCPT
761 -3 DATA or MAIL failed - errno and buffer set
765 sync_responses(address_item *addrlist, BOOL include_affixes,
766 address_item **sync_addr, host_item *host, int count,
767 BOOL address_retry_include_sender, BOOL pending_MAIL,
768 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
771 address_item *addr = *sync_addr;
774 /* Handle the response for a MAIL command. On error, reinstate the original
775 command in big_buffer for error message use, and flush any further pending
776 responses before returning, except after I/O errors and timeouts. */
781 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
786 uschar flushbuffer[4096];
788 if (buffer[0] == '4')
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
797 && (errno != 0 || flushbuffer[0] == 0))
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
816 /* Read and handle the required number of RCPT responses, matching each one up
817 with an address by scanning for the next address whose status is PENDING_DEFER.
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
824 /* The address was accepted */
825 addr->host_used = host;
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
830 addr->transport_return = PENDING_OK;
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
836 if (testflag(addr, af_dr_retry_exists))
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
840 retry_add_item(addr, altkey, rf_delete);
841 retry_add_item(addr, addr->address_retry_key, rf_delete);
845 /* Timeout while reading the response */
847 else if (errno == ETIMEDOUT)
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
852 retry_add_item(addr, addr->address_retry_key, 0);
853 update_waiting = FALSE;
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
862 else if (errno != 0 || buffer[0] == 0)
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
869 /* Handle SMTP permanent and temporary response codes. */
874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
877 setflag(addr, af_pass_message);
878 msglog_line(host, addr->message);
880 /* The response was 5xx */
882 if (buffer[0] == '5')
884 addr->transport_return = FAIL;
888 /* The response was 4xx */
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
902 /* Do not put this message on the list of those waiting for specific
903 hosts, as otherwise it is likely to be tried too often. */
905 update_waiting = FALSE;
907 /* Add a retry item for the address so that it doesn't get tried again
908 too soon. If address_retry_include_sender is true, add the sender address
911 if (address_retry_include_sender)
913 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
915 retry_add_item(addr, altkey, 0);
917 else retry_add_item(addr, addr->address_retry_key, 0);
920 } /* Loop for next RCPT response */
922 /* Update where to start at for the next block of responses, unless we
923 have already handled all the addresses. */
925 if (addr != NULL) *sync_addr = addr->next;
927 /* Handle a response to DATA. If we have not had any good recipients, either
928 previously or in this block, the response is ignored. */
930 if (pending_DATA != 0 &&
931 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
936 if (pending_DATA > 0 || (yield & 1) != 0)
938 if (errno == 0 && buffer[0] == '4')
940 errno = ERRNO_DATA4XX;
941 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
945 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
946 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
947 "is in use and there were no good recipients\n", msg);
950 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
951 present) received 3xx. If any RCPTs were handled and yielded anything other
952 than 4xx, yield will be set non-zero. */
959 /* Do the client side of smtp-level authentication */
962 buffer EHLO response from server (gets overwritten)
963 addrlist chain of potential addresses to deliver
964 host host to deliver to
966 ibp, obp comms channel control blocks
969 OK Success, or failed (but not required): global "smtp_authenticated" set
970 DEFER Failed authentication (and was required)
971 ERROR Internal problem
973 FAIL_SEND Failed communications - transmit
978 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
979 smtp_transport_options_block *ob, BOOL is_esmtp,
980 smtp_inblock *ibp, smtp_outblock *obp)
983 uschar *fail_reason = US"server did not advertise AUTH support";
985 smtp_authenticated = FALSE;
986 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
987 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
989 if (is_esmtp && !regex_AUTH) regex_AUTH =
990 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
993 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
995 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
996 expand_nmax = -1; /* reset */
998 /* Must not do this check until after we have saved the result of the
999 regex match above. */
1001 if (require_auth == OK ||
1002 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1005 fail_reason = US"no common mechanisms were found";
1007 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1009 /* Scan the configured authenticators looking for one which is configured
1010 for use as a client, which is not suppressed by client_condition, and
1011 whose name matches an authentication mechanism supported by the server.
1012 If one is found, attempt to authenticate by calling its client function.
1015 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1019 (au->client_condition != NULL &&
1020 !expand_check_condition(au->client_condition, au->name,
1021 US"client authenticator")))
1023 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1025 (au->client)? "client_condition is false" :
1026 "not configured as a client");
1030 /* Loop to scan supported server mechanisms */
1035 int len = Ustrlen(au->public_name);
1036 while (isspace(*p)) p++;
1038 if (strncmpic(au->public_name, p, len) != 0 ||
1039 (p[len] != 0 && !isspace(p[len])))
1041 while (*p != 0 && !isspace(*p)) p++;
1045 /* Found data for a listed mechanism. Call its client entry. Set
1046 a flag in the outblock so that data is overwritten after sending so
1047 that reflections don't show it. */
1049 fail_reason = US"authentication attempt(s) failed";
1050 obp->authenticating = TRUE;
1051 rc = (au->info->clientcode)(au, ibp, obp,
1052 ob->command_timeout, buffer, bufsize);
1053 obp->authenticating = FALSE;
1054 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1057 /* A temporary authentication failure must hold up delivery to
1058 this host. After a permanent authentication failure, we carry on
1059 to try other authentication methods. If all fail hard, try to
1060 deliver the message unauthenticated unless require_auth was set. */
1065 smtp_authenticated = TRUE; /* stops the outer loop */
1066 client_authenticator = au->name;
1067 if (au->set_client_id != NULL)
1068 client_authenticated_id = expand_string(au->set_client_id);
1071 /* Failure after writing a command */
1076 /* Failure after reading a response */
1079 if (errno != 0 || buffer[0] != '5') return FAIL;
1080 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1081 au->name, host->name, host->address, buffer);
1084 /* Failure by some other means. In effect, the authenticator
1085 decided it wasn't prepared to handle this case. Typically this
1086 is the result of "fail" in an expansion string. Do we need to
1087 log anything here? Feb 2006: a message is now put in the buffer
1088 if logging is required. */
1092 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1093 "authentication H=%s [%s] %s", au->name, host->name,
1094 host->address, buffer);
1097 /* Internal problem, message in buffer. */
1100 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1101 DEFER, FALSE, NULL);
1105 break; /* If not authenticated, try next authenticator */
1106 } /* Loop for scanning supported server mechanisms */
1107 } /* Loop for further authenticators */
1111 /* If we haven't authenticated, but are required to, give up. */
1113 if (require_auth == OK && !smtp_authenticated)
1115 set_errno(addrlist, ERRNO_AUTHFAIL,
1116 string_sprintf("authentication required but %s", fail_reason), DEFER,
1125 /* Construct AUTH appendix string for MAIL TO */
1128 buffer to build string
1129 addrlist chain of potential addresses to deliver
1130 ob transport options
1132 Globals smtp_authenticated
1133 client_authenticated_sender
1134 Return True on error, otherwise buffer has (possibly empty) terminated string
1138 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1139 smtp_transport_options_block *ob)
1141 uschar *local_authenticated_sender = authenticated_sender;
1144 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1147 if (ob->authenticated_sender != NULL)
1149 uschar *new = expand_string(ob->authenticated_sender);
1152 if (!expand_string_forcedfail)
1154 uschar *message = string_sprintf("failed to expand "
1155 "authenticated_sender: %s", expand_string_message);
1156 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1160 else if (new[0] != 0) local_authenticated_sender = new;
1163 /* Add the authenticated sender address if present */
1165 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1166 local_authenticated_sender != NULL)
1168 string_format(buffer, bufsize, " AUTH=%s",
1169 auth_xtextencode(local_authenticated_sender,
1170 Ustrlen(local_authenticated_sender)));
1171 client_authenticated_sender = string_copy(local_authenticated_sender);
1181 #ifdef EXPERIMENTAL_DANE
1183 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1184 BOOL dane_required, BOOL * dane)
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1188 const uschar * fullname = buffer;
1190 /* TLSA lookup string */
1191 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1193 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1196 return DEFER; /* just defer this TLS'd conn */
1202 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1208 if (!dns_is_secure(dnsa))
1210 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1222 typedef struct smtp_compare_s
1224 uschar *current_sender_address;
1225 struct transport_instance *tblock;
1229 Create a unique string that identifies this message, it is based on
1230 sender_address, helo_data and tls_certificate if enabled. */
1233 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1235 address_item * addr1;
1236 uschar * if1 = US"";
1237 uschar * helo1 = US"";
1239 uschar * tlsc1 = US"";
1241 uschar * save_sender_address = sender_address;
1242 uschar * local_identity = NULL;
1243 smtp_transport_options_block * ob =
1244 (smtp_transport_options_block *)tblock->options_block;
1246 sender_address = sender;
1248 addr1 = deliver_make_addr (sender, TRUE);
1249 deliver_set_expansions(addr1);
1252 if1 = expand_string(ob->interface);
1255 helo1 = expand_string(ob->helo_data);
1258 if (ob->tls_certificate)
1259 tlsc1 = expand_string(ob->tls_certificate);
1260 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1262 local_identity = string_sprintf ("%s^%s", if1, helo1);
1265 deliver_set_expansions(NULL);
1266 sender_address = save_sender_address;
1268 return local_identity;
1273 /* This routine is a callback that is called from transport_check_waiting.
1274 This function will evaluate the incoming message versus the previous
1275 message. If the incoming message is using a different local identity then
1276 we will veto this new message. */
1279 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1281 uschar * save_sender_address = sender_address;
1282 uschar * current_local_identity =
1283 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1284 uschar * new_sender_address = deliver_get_sender_address(message_id);
1285 uschar * message_local_identity =
1286 smtp_local_identity(new_sender_address, s_compare->tblock);
1288 sender_address = save_sender_address;
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1295 /*************************************************
1296 * Deliver address list to given host *
1297 *************************************************/
1299 /* If continue_hostname is not null, we get here only when continuing to
1300 deliver down an existing channel. The channel was passed as the standard
1301 input. TLS is never active on a passed channel; the previous process always
1302 closes it down before passing the connection on.
1304 Otherwise, we have to make a connection to the remote host, and do the
1305 initial protocol exchange.
1307 When running as an MUA wrapper, if the sender or any recipient is rejected,
1308 temporarily or permanently, we force failure for all recipients.
1311 addrlist chain of potential addresses to deliver; only those whose
1312 transport_return field is set to PENDING_DEFER are currently
1313 being processed; others should be skipped - they have either
1314 been delivered to an earlier host or IP address, or been
1315 failed by one of them.
1316 host host to deliver to
1317 host_af AF_INET or AF_INET6
1318 port default TCP/IP port to use, in host byte order
1319 interface interface to bind to, or NULL
1320 tblock transport instance block
1321 message_defer set TRUE if yield is OK, but all addresses were deferred
1322 because of a non-recipient, non-host failure, that is, a
1323 4xx response to MAIL FROM, DATA, or ".". This is a defer
1324 that is specific to the message.
1325 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1326 a second attempt after TLS initialization fails
1328 Returns: OK - the connection was made and the delivery attempted;
1329 the result for each address is in its data block.
1330 DEFER - the connection could not be made, or something failed
1331 while setting up the SMTP session, or there was a
1332 non-message-specific error, such as a timeout.
1333 ERROR - a filter command is specified for this transport,
1334 and there was a problem setting it up; OR helo_data
1335 or add_headers or authenticated_sender is specified
1336 for this transport, and the string failed to expand
1340 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1341 uschar *interface, transport_instance *tblock,
1342 BOOL *message_defer, BOOL suppress_tls)
1345 address_item *sync_addr;
1346 address_item *first_addr = addrlist;
1351 time_t start_delivery_time = time(NULL);
1352 smtp_transport_options_block *ob =
1353 (smtp_transport_options_block *)(tblock->options_block);
1354 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1355 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1357 BOOL send_rset = TRUE;
1358 BOOL send_quit = TRUE;
1359 BOOL setting_up = TRUE;
1360 BOOL completed_address = FALSE;
1363 BOOL pass_message = FALSE;
1364 #ifndef DISABLE_PRDR
1365 BOOL prdr_offered = FALSE;
1368 #ifdef EXPERIMENTAL_INTERNATIONAL
1369 BOOL utf8_needed = FALSE;
1370 BOOL utf8_offered = FALSE;
1372 BOOL dsn_all_lasthop = TRUE;
1373 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1376 dns_answer tlsa_dnsa;
1378 smtp_inblock inblock;
1379 smtp_outblock outblock;
1380 int max_rcpt = tblock->max_addresses;
1381 uschar *igquotstr = US"";
1383 uschar *helo_data = NULL;
1385 uschar *message = NULL;
1386 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1388 uschar buffer[4096];
1389 uschar inbuffer[4096];
1390 uschar outbuffer[4096];
1391 address_item * current_address;
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 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1465 if (host->dnssec == DS_YES)
1468 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1470 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1474 else if (dane_required)
1476 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1481 ob->tls_tempfail_tryclear = FALSE;
1485 /* Expand the greeting message while waiting for the initial response. (Makes
1486 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1487 delayed till here so that $sending_interface and $sending_port are set. */
1489 helo_data = expand_string(ob->helo_data);
1490 #ifdef EXPERIMENTAL_INTERNATIONAL
1493 uschar * errstr = NULL;
1494 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1496 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1497 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1504 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1505 is nevertheless a reasonably clean way of programming this kind of logic,
1506 where you want to escape on any error. */
1510 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1511 ob->command_timeout)) goto RESPONSE_FAILED;
1513 #ifdef EXPERIMENTAL_EVENT
1516 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1517 : host->dnssec==DS_NO ? US"no" : NULL;
1518 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1521 set_errno(addrlist, ERRNO_EXPANDFAIL,
1522 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1523 DEFER, FALSE, NULL);
1530 /* Now check if the helo_data expansion went well, and sign off cleanly if
1533 if (helo_data == NULL)
1535 uschar *message = string_sprintf("failed to expand helo_data: %s",
1536 expand_string_message);
1537 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1543 /** Debugging without sending a message
1544 addrlist->transport_return = DEFER;
1548 /* Errors that occur after this point follow an SMTP command, which is
1549 left in big_buffer by smtp_write_command() for use in error messages. */
1551 smtp_command = big_buffer;
1553 /* Tell the remote who we are...
1555 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1556 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1557 greeting is of this form. The assumption was that the far end supports it
1558 properly... but experience shows that there are some that give 5xx responses,
1559 even though the banner includes "ESMTP" (there's a bloody-minded one that
1560 says "ESMTP not spoken here"). Cope with that case.
1562 September 2000: Time has passed, and it seems reasonable now to always send
1563 EHLO at the start. It is also convenient to make the change while installing
1566 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1567 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1568 would be no way to send out the mails, so there is now a host list
1569 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1570 PIPELINING problem as well. Maybe it can also be useful to cure other
1571 problems with broken servers.
1573 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1574 Then somebody tried it with a Microsoft mailer... It seems that all other
1575 mailers use upper case for some reason (the RFC is quite clear about case
1576 independence) so, for peace of mind, I gave in. */
1578 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1580 /* Alas; be careful, since this goto is not an error-out, so conceivably
1581 we might set data between here and the target which we assume to exist
1582 and be usable. I can see this coming back to bite us. */
1587 suppress_tls = FALSE;
1588 ob->tls_tempfail_tryclear = FALSE;
1589 smtp_command = US"SSL-on-connect";
1596 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1597 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1599 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1600 ob->command_timeout))
1602 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1609 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1614 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1616 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1617 ob->command_timeout)) goto RESPONSE_FAILED;
1620 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1621 lmtp_ignore_quota option was set. */
1623 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1624 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1625 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1627 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1630 tls_offered = esmtp &&
1631 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1632 PCRE_EOPT, NULL, 0) >= 0;
1635 #ifndef DISABLE_PRDR
1636 prdr_offered = esmtp
1637 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1638 PCRE_EOPT, NULL, 0) >= 0
1639 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1642 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1645 #ifdef EXPERIMENTAL_INTERNATIONAL
1646 if (addrlist->prop.utf8_msg)
1648 utf8_needed = !addrlist->prop.utf8_downcvt
1649 && !addrlist->prop.utf8_downcvt_maybe;
1650 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1651 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1653 utf8_offered = esmtp
1654 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1655 PCRE_EOPT, NULL, 0) >= 0;
1660 /* For continuing deliveries down the same channel, the socket is the standard
1661 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1662 below). Set up the pointer to where subsequent commands will be left, for
1663 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1664 set from the command line if they were set in the process that passed the
1669 inblock.sock = outblock.sock = fileno(stdin);
1670 smtp_command = big_buffer;
1671 host->port = port; /* Record the port that was used */
1674 /* If TLS is available on this connection, whether continued or not, attempt to
1675 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1676 send another EHLO - the server may give a different answer in secure mode. We
1677 use a separate buffer for reading the response to STARTTLS so that if it is
1678 negative, the original EHLO data is available for subsequent analysis, should
1679 the client not be required to use TLS. If the response is bad, copy the buffer
1680 for error analysis. */
1685 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1687 uschar buffer2[4096];
1688 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1691 /* If there is an I/O error, transmission of this message is deferred. If
1692 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1693 false, we also defer. However, if there is a temporary rejection of STARTTLS
1694 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1695 STARTTLS, we carry on. This means we will try to send the message in clear,
1696 unless the host is in hosts_require_tls (tested below). */
1698 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1699 ob->command_timeout))
1701 if (errno != 0 || buffer2[0] == 0 ||
1702 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1704 Ustrncpy(buffer, buffer2, sizeof(buffer));
1705 goto RESPONSE_FAILED;
1709 /* STARTTLS accepted: try to negotiate a TLS session. */
1714 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1715 # ifdef EXPERIMENTAL_DANE
1716 , dane ? &tlsa_dnsa : NULL
1720 /* TLS negotiation failed; give an error. From outside, this function may
1721 be called again to try in clear on a new connection, if the options permit
1722 it for this host. */
1726 # ifdef EXPERIMENTAL_DANE
1727 if (rc == DEFER && dane && !dane_required)
1729 log_write(0, LOG_MAIN, "DANE attempt failed;"
1730 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1731 host->name, host->address);
1737 save_errno = ERRNO_TLSFAILURE;
1738 message = US"failure while setting up TLS session";
1743 /* TLS session is set up */
1745 for (addr = addrlist; addr != NULL; addr = addr->next)
1746 if (addr->transport_return == PENDING_DEFER)
1748 addr->cipher = tls_out.cipher;
1749 addr->ourcert = tls_out.ourcert;
1750 addr->peercert = tls_out.peercert;
1751 addr->peerdn = tls_out.peerdn;
1752 addr->ocsp = tls_out.ocsp;
1757 /* if smtps, we'll have smtp_command set to something else; always safe to
1759 smtp_command = big_buffer;
1761 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1762 helo_data is null, we are dealing with a connection that was passed from
1763 another process, and so we won't have expanded helo_data above. We have to
1764 expand it here. $sending_ip_address and $sending_port are set up right at the
1765 start of the Exim process (in exim.c). */
1767 if (tls_out.active >= 0)
1770 if (helo_data == NULL)
1772 helo_data = expand_string(ob->helo_data);
1773 if (helo_data == NULL)
1775 uschar *message = string_sprintf("failed to expand helo_data: %s",
1776 expand_string_message);
1777 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1783 /* For SMTPS we need to wait for the initial OK response. */
1786 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1787 ob->command_timeout)) goto RESPONSE_FAILED;
1791 greeting_cmd = "EHLO";
1794 greeting_cmd = "HELO";
1796 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1799 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1800 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1802 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1803 ob->command_timeout))
1804 goto RESPONSE_FAILED;
1807 /* If the host is required to use a secure channel, ensure that we
1811 # ifdef EXPERIMENTAL_DANE
1814 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1817 save_errno = ERRNO_TLSREQUIRED;
1818 message = string_sprintf("a TLS session is required, but %s",
1819 tls_offered? "an attempt to start TLS failed" :
1820 "the server did not offer TLS support");
1823 #endif /*SUPPORT_TLS*/
1825 /* If TLS is active, we have just started it up and re-done the EHLO command,
1826 so its response needs to be analyzed. If TLS is not active and this is a
1827 continued session down a previously-used socket, we haven't just done EHLO, so
1830 if (continue_hostname == NULL
1832 || tls_out.active >= 0
1836 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1837 lmtp_ignore_quota option was set. */
1839 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1840 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1841 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1843 /* If the response to EHLO specified support for the SIZE parameter, note
1844 this, provided size_addition is non-negative. */
1846 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1847 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1848 PCRE_EOPT, NULL, 0) >= 0;
1850 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1851 the current host, esmtp will be false, so PIPELINING can never be used. If
1852 the current host matches hosts_avoid_pipelining, don't do it. */
1854 smtp_use_pipelining = esmtp
1855 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1856 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1857 PCRE_EOPT, NULL, 0) >= 0;
1859 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1860 smtp_use_pipelining? "" : "not ");
1862 #ifndef DISABLE_PRDR
1863 prdr_offered = esmtp
1864 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1865 PCRE_EOPT, NULL, 0) >= 0
1866 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1869 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1872 #ifdef EXPERIMENTAL_INTERNATIONAL
1873 if (addrlist->prop.utf8_msg)
1874 utf8_offered = esmtp
1875 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1876 PCRE_EOPT, NULL, 0) >= 0;
1879 /* Note if the server supports DSN */
1880 smtp_use_dsn = esmtp
1881 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1882 PCRE_EOPT, NULL, 0) >= 0;
1883 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1885 /* Note if the response to EHLO specifies support for the AUTH extension.
1886 If it has, check that this host is one we want to authenticate to, and do
1887 the business. The host name and address must be available when the
1888 authenticator's client driver is running. */
1890 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1891 ob, esmtp, &inblock, &outblock))
1893 default: goto SEND_QUIT;
1895 case FAIL_SEND: goto SEND_FAILED;
1896 case FAIL: goto RESPONSE_FAILED;
1900 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1901 message-specific. */
1905 #ifdef EXPERIMENTAL_INTERNATIONAL
1906 /* If this is an international message we need the host to speak SMTPUTF8 */
1907 if (utf8_needed && !utf8_offered)
1909 errno = ERRNO_UTF8_FWD;
1910 goto RESPONSE_FAILED;
1914 /* If there is a filter command specified for this transport, we can now
1915 set it up. This cannot be done until the identify of the host is known. */
1917 if (tblock->filter_command != NULL)
1921 sprintf(CS buffer, "%.50s transport", tblock->name);
1922 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1923 TRUE, DEFER, addrlist, buffer, NULL);
1924 transport_filter_timeout = tblock->filter_timeout;
1926 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1931 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1939 /* For messages that have more than the maximum number of envelope recipients,
1940 we want to send several transactions down the same SMTP connection. (See
1941 comments in deliver.c as to how this reconciles, heuristically, with
1942 remote_max_parallel.) This optimization was added to Exim after the following
1943 code was already working. The simplest way to put it in without disturbing the
1944 code was to use a goto to jump back to this point when there is another
1945 transaction to handle. */
1948 sync_addr = first_addr;
1952 completed_address = FALSE;
1955 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1956 qualification, send it, adding something to the message size to allow for
1957 imprecision and things that get added en route. Exim keeps the number of lines
1958 in a message, so we can give an accurate value for the original message, but we
1959 need some additional to handle added headers. (Double "." characters don't get
1960 included in the count.) */
1967 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1971 #ifndef DISABLE_PRDR
1972 prdr_active = FALSE;
1975 for (addr = first_addr; addr; addr = addr->next)
1976 if (addr->transport_return == PENDING_DEFER)
1978 for (addr = addr->next; addr; addr = addr->next)
1979 if (addr->transport_return == PENDING_DEFER)
1980 { /* at least two recipients to send */
1982 sprintf(CS p, " PRDR"); p += 5;
1990 #ifdef EXPERIMENTAL_INTERNATIONAL
1991 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1992 sprintf(CS p, " SMTPUTF8"), p += 9;
1995 /* check if all addresses have lasthop flag */
1996 /* do not send RET and ENVID if true */
1997 for (dsn_all_lasthop = TRUE, addr = first_addr;
1998 address_count < max_rcpt && addr != NULL;
2000 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2002 dsn_all_lasthop = FALSE;
2006 /* Add any DSN flags to the mail command */
2008 if (smtp_use_dsn && !dsn_all_lasthop)
2010 if (dsn_ret == dsn_ret_hdrs)
2012 Ustrcpy(p, " RET=HDRS");
2015 else if (dsn_ret == dsn_ret_full)
2017 Ustrcpy(p, " RET=FULL");
2020 if (dsn_envid != NULL)
2022 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2027 /* If an authenticated_sender override has been specified for this transport
2028 instance, expand it. If the expansion is forced to fail, and there was already
2029 an authenticated_sender for this message, the original value will be used.
2030 Other expansion failures are serious. An empty result is ignored, but there is
2031 otherwise no check - this feature is expected to be used with LMTP and other
2032 cases where non-standard addresses (e.g. without domains) might be required. */
2034 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2040 /* From here until we send the DATA command, we can make use of PIPELINING
2041 if the server host supports it. The code has to be able to check the responses
2042 at any point, for when the buffer fills up, so we write it totally generally.
2043 When PIPELINING is off, each command written reports that it has flushed the
2046 pending_MAIL = TRUE; /* The block starts with MAIL */
2049 uschar * s = return_path;
2050 #ifdef EXPERIMENTAL_INTERNATIONAL
2051 uschar * errstr = NULL;
2053 /* If we must downconvert, do the from-address here. Remember we had to
2054 for the to-addresses (done below), and also (ugly) for re-doing when building
2055 the delivery log line. */
2057 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2059 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2061 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2065 setflag(addrlist, af_utf8_downcvt);
2069 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2070 "MAIL FROM:<%s>%s\r\n", s, buffer);
2073 mail_command = string_copy(big_buffer); /* Save for later error message */
2077 case -1: /* Transmission error */
2080 case +1: /* Block was sent */
2081 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2082 ob->command_timeout))
2084 if (errno == 0 && buffer[0] == '4')
2086 errno = ERRNO_MAIL4XX;
2087 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2089 goto RESPONSE_FAILED;
2091 pending_MAIL = FALSE;
2095 /* Pass over all the relevant recipient addresses for this host, which are the
2096 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2097 several before we have to read the responses for those seen so far. This
2098 checking is done by a subroutine because it also needs to be done at the end.
2099 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2100 the next one if not all are sent.
2102 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2103 last address because we want to abort if any recipients have any kind of
2104 problem, temporary or permanent. We know that all recipient addresses will have
2105 the PENDING_DEFER status, because only one attempt is ever made, and we know
2106 that max_rcpt will be large, so all addresses will be done at once. */
2108 for (addr = first_addr;
2109 address_count < max_rcpt && addr != NULL;
2116 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2118 if (addr->transport_return != PENDING_DEFER) continue;
2121 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2123 /* Add any DSN flags to the rcpt command and add to the sent string */
2128 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2130 if ((addr->dsn_flags & rf_dsnflags) != 0)
2134 Ustrcpy(p, " NOTIFY=");
2136 for (i = 0; i < 4; i++)
2137 if ((addr->dsn_flags & rf_list[i]) != 0)
2139 if (!first) *p++ = ',';
2141 Ustrcpy(p, rf_names[i]);
2146 if (addr->dsn_orcpt != NULL)
2148 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2154 /* Now send the RCPT command, and process outstanding responses when
2155 necessary. After a timeout on RCPT, we just end the function, leaving the
2156 yield as OK, because this error can often mean that there is a problem with
2157 just one address, so we don't want to delay the host. */
2159 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2161 #ifdef EXPERIMENTAL_INTERNATIONAL
2163 uschar * dummy_errstr;
2164 if ( testflag(addrlist, af_utf8_downcvt)
2165 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2169 errno = ERRNO_EXPANDFAIL;
2175 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2176 rcpt_addr, igquotstr, buffer);
2178 if (count < 0) goto SEND_FAILED;
2181 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2182 &sync_addr, host, count, ob->address_retry_include_sender,
2183 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2186 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2187 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2190 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2191 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2192 case 0: /* No 2xx or 5xx, but no probs */
2195 case -1: goto END_OFF; /* Timeout on RCPT */
2196 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2198 pending_MAIL = FALSE; /* Dealt with MAIL */
2200 } /* Loop for next address */
2202 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2203 permanently or temporarily. We should have flushed and synced after the last
2208 address_item *badaddr;
2209 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2210 if (badaddr->transport_return != PENDING_OK)
2212 /*XXX could we find a better errno than 0 here? */
2213 set_errno(addrlist, 0, badaddr->message, FAIL,
2214 testflag(badaddr, af_pass_message), NULL);
2220 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2221 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2222 have a good recipient buffered up if we are pipelining. We don't want to waste
2223 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2224 are pipelining. The responses are all handled by sync_responses(). */
2226 if (ok || (smtp_use_pipelining && !mua_wrapper))
2228 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2229 if (count < 0) goto SEND_FAILED;
2230 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2231 host, count, ob->address_retry_include_sender, pending_MAIL,
2232 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2234 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2235 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2238 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2239 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2240 case 0: break; /* No 2xx or 5xx, but no probs */
2242 case -1: goto END_OFF; /* Timeout on RCPT */
2243 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2247 /* Save the first address of the next batch. */
2251 /* If there were no good recipients (but otherwise there have been no
2252 problems), just set ok TRUE, since we have handled address-specific errors
2253 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2254 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2255 well as body. Set the appropriate timeout value to be used for each chunk.
2256 (Haven't been able to make it work using select() for writing yet.) */
2258 if (!ok) ok = TRUE; else
2260 sigalrm_seen = FALSE;
2261 transport_write_timeout = ob->data_timeout;
2262 smtp_command = US"sending data block"; /* For error messages */
2263 DEBUG(D_transport|D_v)
2264 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2265 transport_count = 0;
2267 #ifndef DISABLE_DKIM
2268 ok = dkim_transport_write_message(addrlist, inblock.sock,
2269 topt_use_crlf | topt_end_dot | topt_escape_headers |
2270 (tblock->body_only? topt_no_headers : 0) |
2271 (tblock->headers_only? topt_no_body : 0) |
2272 (tblock->return_path_add? topt_add_return_path : 0) |
2273 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2274 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2275 0, /* No size limit */
2276 tblock->add_headers, tblock->remove_headers,
2277 US".", US"..", /* Escaping strings */
2278 tblock->rewrite_rules, tblock->rewrite_existflags,
2279 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2280 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2283 ok = transport_write_message(addrlist, inblock.sock,
2284 topt_use_crlf | topt_end_dot | topt_escape_headers |
2285 (tblock->body_only? topt_no_headers : 0) |
2286 (tblock->headers_only? topt_no_body : 0) |
2287 (tblock->return_path_add? topt_add_return_path : 0) |
2288 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2289 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2290 0, /* No size limit */
2291 tblock->add_headers, tblock->remove_headers,
2292 US".", US"..", /* Escaping strings */
2293 tblock->rewrite_rules, tblock->rewrite_existflags);
2296 /* transport_write_message() uses write() because it is called from other
2297 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2298 it can exit with "Broken pipe" as its error. This really means that the
2299 socket got closed at the far end. */
2301 transport_write_timeout = 0; /* for subsequent transports */
2303 /* Failure can either be some kind of I/O disaster (including timeout),
2304 or the failure of a transport filter or the expansion of added headers. */
2308 buffer[0] = 0; /* There hasn't been a response */
2309 goto RESPONSE_FAILED;
2312 /* We used to send the terminating "." explicitly here, but because of
2313 buffering effects at both ends of TCP/IP connections, you don't gain
2314 anything by keeping it separate, so it might as well go in the final
2315 data buffer for efficiency. This is now done by setting the topt_end_dot
2318 smtp_command = US"end of data";
2320 #ifndef DISABLE_PRDR
2321 /* For PRDR we optionally get a partial-responses warning
2322 * followed by the individual responses, before going on with
2323 * the overall response. If we don't get the warning then deal
2324 * with per non-PRDR. */
2327 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2329 if (!ok && errno == 0)
2332 case '2': prdr_active = FALSE;
2335 case '4': errno = ERRNO_DATA4XX;
2336 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2343 /* For non-PRDR SMTP, we now read a single response that applies to the
2344 whole message. If it is OK, then all the addresses have been delivered. */
2348 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2350 if (!ok && errno == 0 && buffer[0] == '4')
2352 errno = ERRNO_DATA4XX;
2353 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2357 /* For LMTP, we get back a response for every RCPT command that we sent;
2358 some may be accepted and some rejected. For those that get a response, their
2359 status is fixed; any that are accepted have been handed over, even if later
2360 responses crash - at least, that's how I read RFC 2033.
2362 If all went well, mark the recipient addresses as completed, record which
2363 host/IPaddress they were delivered to, and cut out RSET when sending another
2364 message down the same channel. Write the completed addresses to the journal
2365 now so that they are recorded in case there is a crash of hardware or
2366 software before the spool gets updated. Also record the final SMTP
2367 confirmation if needed (for SMTP only). */
2372 int delivery_time = (int)(time(NULL) - start_delivery_time);
2374 uschar *conf = NULL;
2377 /* Set up confirmation if needed - applies only to SMTP */
2380 #ifndef EXPERIMENTAL_EVENT
2381 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2386 const uschar *s = string_printing(buffer);
2387 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2388 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2391 /* Process all transported addresses - for LMTP or PRDR, read a status for
2394 for (addr = addrlist; addr != first_addr; addr = addr->next)
2396 if (addr->transport_return != PENDING_OK) continue;
2398 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2399 remaining addresses. Otherwise, it's a return code for just the one
2400 address. For temporary errors, add a retry item for the address so that
2401 it doesn't get tried again too soon. */
2403 #ifndef DISABLE_PRDR
2404 if (lmtp || prdr_active)
2409 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2412 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2413 addr->message = string_sprintf(
2414 #ifndef DISABLE_PRDR
2415 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2417 "LMTP error after %s: %s",
2419 big_buffer, string_printing(buffer));
2420 setflag(addr, af_pass_message); /* Allow message to go to user */
2421 if (buffer[0] == '5')
2422 addr->transport_return = FAIL;
2425 errno = ERRNO_DATA4XX;
2426 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2427 addr->transport_return = DEFER;
2428 #ifndef DISABLE_PRDR
2431 retry_add_item(addr, addr->address_retry_key, 0);
2435 completed_address = TRUE; /* NOW we can set this flag */
2436 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2438 const uschar *s = string_printing(buffer);
2439 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2440 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2444 /* SMTP, or success return from LMTP for this address. Pass back the
2445 actual host that was used. */
2447 addr->transport_return = OK;
2448 addr->more_errno = delivery_time;
2449 addr->host_used = host;
2450 addr->special_action = flag;
2451 addr->message = conf;
2452 #ifndef DISABLE_PRDR
2453 if (prdr_active) addr->flags |= af_prdr_used;
2457 #ifndef DISABLE_PRDR
2461 /* Update the journal. For homonymic addresses, use the base address plus
2462 the transport name. See lots of comments in deliver.c about the reasons
2463 for the complications when homonyms are involved. Just carry on after
2464 write error, as it may prove possible to update the spool file later. */
2466 if (testflag(addr, af_homonym))
2467 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2469 sprintf(CS buffer, "%.500s\n", addr->unique);
2471 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2472 len = Ustrlen(CS buffer);
2473 if (write(journal_fd, buffer, len) != len)
2474 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2475 "%s: %s", buffer, strerror(errno));
2479 #ifndef DISABLE_PRDR
2482 /* PRDR - get the final, overall response. For any non-success
2483 upgrade all the address statuses. */
2484 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2488 if(errno == 0 && buffer[0] == '4')
2490 errno = ERRNO_DATA4XX;
2491 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2493 for (addr = addrlist; addr != first_addr; addr = addr->next)
2494 if (buffer[0] == '5' || addr->transport_return == OK)
2495 addr->transport_return = PENDING_OK; /* allow set_errno action */
2496 goto RESPONSE_FAILED;
2499 /* Update the journal, or setup retry. */
2500 for (addr = addrlist; addr != first_addr; addr = addr->next)
2501 if (addr->transport_return == OK)
2503 if (testflag(addr, af_homonym))
2504 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2506 sprintf(CS buffer, "%.500s\n", addr->unique);
2508 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2509 len = Ustrlen(CS buffer);
2510 if (write(journal_fd, buffer, len) != len)
2511 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2512 "%s: %s", buffer, strerror(errno));
2514 else if (addr->transport_return == DEFER)
2515 retry_add_item(addr, addr->address_retry_key, -2);
2519 /* Ensure the journal file is pushed out to disk. */
2521 if (EXIMfsync(journal_fd) < 0)
2522 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2528 /* Handle general (not specific to one address) failures here. The value of ok
2529 is used to skip over this code on the falling through case. A timeout causes a
2530 deferral. Other errors may defer or fail according to the response code, and
2531 may set up a special errno value, e.g. after connection chopped, which is
2532 assumed if errno == 0 and there is no text in the buffer. If control reaches
2533 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2534 the problem is not related to this specific message. */
2543 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2544 buffer, &code, &message, &pass_message);
2550 message = US string_sprintf("send() to %s [%s] failed: %s",
2551 host->name, host->address, strerror(save_errno));
2555 /* This label is jumped to directly when a TLS negotiation has failed,
2556 or was not done for a host for which it is required. Values will be set
2557 in message and save_errno, and setting_up will always be true. Treat as
2558 a temporary error. */
2565 /* If the failure happened while setting up the call, see if the failure was
2566 a 5xx response (this will either be on connection, or following HELO - a 5xx
2567 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2568 never going to accept them. For other errors during setting up (timeouts or
2569 whatever), defer all addresses, and yield DEFER, so that the host is not
2570 tried again for a while. */
2573 ok = FALSE; /* For when reached by GOTO */
2578 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2581 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2586 /* We want to handle timeouts after MAIL or "." and loss of connection after
2587 "." specially. They can indicate a problem with the sender address or with
2588 the contents of the message rather than a real error on the connection. These
2589 cases are treated in the same way as a 4xx response. This next bit of code
2590 does the classification. */
2598 #ifdef EXPERIMENTAL_INTERNATIONAL
2599 case ERRNO_UTF8_FWD:
2606 message_error = TRUE;
2610 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2611 Ustrncmp(smtp_command,"end ",4) == 0;
2614 case ERRNO_SMTPCLOSED:
2615 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2619 message_error = FALSE;
2623 /* Handle the cases that are treated as message errors. These are:
2625 (a) negative response or timeout after MAIL
2626 (b) negative response after DATA
2627 (c) negative response or timeout or dropped connection after "."
2628 (d) utf8 support required and not offered
2630 It won't be a negative response or timeout after RCPT, as that is dealt
2631 with separately above. The action in all cases is to set an appropriate
2632 error code for all the addresses, but to leave yield set to OK because the
2633 host itself has not failed. Of course, it might in practice have failed
2634 when we've had a timeout, but if so, we'll discover that at the next
2635 delivery attempt. For a temporary error, set the message_defer flag, and
2636 write to the logs for information if this is not the last host. The error
2637 for the last host will be logged as part of the address's log line. */
2641 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2642 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2643 pass_message, host);
2645 /* If there's an errno, the message contains just the identity of
2648 if (code != '5') /* Anything other than 5 is treated as temporary */
2651 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2652 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2653 msglog_line(host, message);
2654 *message_defer = TRUE;
2658 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2659 ".", or some other transportation error. We defer all addresses and yield
2660 DEFER, except for the case of failed add_headers expansion, or a transport
2661 filter failure, when the yield should be ERROR, to stop it trying other
2666 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2667 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2668 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2674 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2675 SMTP session tidily. However, if there were too many addresses to send in one
2676 message (indicated by first_addr being non-NULL) we want to carry on with the
2677 rest of them. Also, it is desirable to send more than one message down the SMTP
2678 connection if there are several waiting, provided we haven't already sent so
2679 many as to hit the configured limit. The function transport_check_waiting looks
2680 for a waiting message and returns its id. Then transport_pass_socket tries to
2681 set up a continued delivery by passing the socket on to another process. The
2682 variable send_rset is FALSE if a message has just been successfully transfered.
2684 If we are already sending down a continued channel, there may be further
2685 addresses not yet delivered that are aimed at the same host, but which have not
2686 been passed in this run of the transport. In this case, continue_more will be
2687 true, and all we should do is send RSET if necessary, and return, leaving the
2690 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2691 do not want to continue with other messages down the same channel, because that
2692 can lead to looping between two or more messages, all with the same,
2693 temporarily failing address(es). [The retry information isn't updated yet, so
2694 new processes keep on trying.] We probably also don't want to try more of this
2695 message's addresses either.
2697 If we have started a TLS session, we have to end it before passing the
2698 connection to a new process. However, not all servers can handle this (Exim
2699 can), so we do not pass such a connection on if the host matches
2700 hosts_nopass_tls. */
2703 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2704 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2705 continue_more, yield, (first_addr == NULL)? "":"not ");
2707 if (completed_address && ok && send_quit)
2710 smtp_compare_t t_compare;
2712 t_compare.tblock = tblock;
2713 t_compare.current_sender_address = sender_address;
2715 if ( first_addr != NULL
2717 || ( ( tls_out.active < 0
2718 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2721 transport_check_waiting(tblock->name, host->name,
2722 tblock->connection_max_messages, new_message_id, &more,
2723 (oicf)smtp_are_same_identities, (void*)&t_compare)
2731 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2733 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2734 host->address, strerror(save_errno));
2737 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2738 ob->command_timeout)))
2741 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2745 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2746 host->name, host->address, msg);
2751 /* Either RSET was not needed, or it succeeded */
2755 if (first_addr != NULL) /* More addresses still to be sent */
2756 { /* in this run of the transport */
2757 continue_sequence++; /* Causes * in logging */
2760 if (continue_more) return yield; /* More addresses for another run */
2762 /* Pass the socket to a new Exim process. Before doing so, we must shut
2763 down TLS. Not all MTAs allow for the continuation of the SMTP session
2764 when TLS is shut down. We test for this by sending a new EHLO. If we
2765 don't get a good response, we don't attempt to pass the socket on. */
2768 if (tls_out.active >= 0)
2770 tls_close(FALSE, TRUE);
2774 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2775 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2776 ob->command_timeout);
2780 /* If the socket is successfully passed, we musn't send QUIT (or
2781 indeed anything!) from here. */
2783 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2784 new_message_id, inblock.sock))
2790 /* If RSET failed and there are addresses left, they get deferred. */
2792 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2796 /* End off tidily with QUIT unless the connection has died or the socket has
2797 been passed to another process. There has been discussion on the net about what
2798 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2799 to wait for a response, but on the other hand, there isn't anything one can do
2800 with an error response, other than log it. Exim used to do that. However,
2801 further discussion suggested that it is positively advantageous not to wait for
2802 the response, but to close the session immediately. This is supposed to move
2803 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2804 load from the server. (Hosts that are both servers and clients may not see much
2805 difference, of course.) Further discussion indicated that this was safe to do
2806 on Unix systems which have decent implementations of TCP/IP that leave the
2807 connection around for a while (TIME_WAIT) after the application has gone away.
2808 This enables the response sent by the server to be properly ACKed rather than
2809 timed out, as can happen on broken TCP/IP implementations on other OS.
2811 This change is being made on 31-Jul-98. After over a year of trouble-free
2812 operation, the old commented-out code was removed on 17-Sep-99. */
2815 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2820 tls_close(FALSE, TRUE);
2823 /* Close the socket, and return the appropriate value, first setting
2824 works because the NULL setting is passed back to the calling process, and
2825 remote_max_parallel is forced to 1 when delivering over an existing connection,
2827 If all went well and continue_more is set, we shouldn't actually get here if
2828 there are further addresses, as the return above will be taken. However,
2829 writing RSET might have failed, or there may be other addresses whose hosts are
2830 specified in the transports, and therefore not visible at top level, in which
2831 case continue_more won't get set. */
2833 (void)close(inblock.sock);
2835 #ifdef EXPERIMENTAL_EVENT
2836 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2839 continue_transport = NULL;
2840 continue_hostname = NULL;
2847 /*************************************************
2848 * Closedown entry point *
2849 *************************************************/
2851 /* This function is called when exim is passed an open smtp channel
2852 from another incarnation, but the message which it has been asked
2853 to deliver no longer exists. The channel is on stdin.
2855 We might do fancy things like looking for another message to send down
2856 the channel, but if the one we sought has gone, it has probably been
2857 delivered by some other process that itself will seek further messages,
2858 so just close down our connection.
2860 Argument: pointer to the transport instance block
2865 smtp_transport_closedown(transport_instance *tblock)
2867 smtp_transport_options_block *ob =
2868 (smtp_transport_options_block *)(tblock->options_block);
2869 smtp_inblock inblock;
2870 smtp_outblock outblock;
2872 uschar inbuffer[4096];
2873 uschar outbuffer[16];
2875 inblock.sock = fileno(stdin);
2876 inblock.buffer = inbuffer;
2877 inblock.buffersize = sizeof(inbuffer);
2878 inblock.ptr = inbuffer;
2879 inblock.ptrend = inbuffer;
2881 outblock.sock = inblock.sock;
2882 outblock.buffersize = sizeof(outbuffer);
2883 outblock.buffer = outbuffer;
2884 outblock.ptr = outbuffer;
2885 outblock.cmd_count = 0;
2886 outblock.authenticating = FALSE;
2888 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2889 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2890 ob->command_timeout);
2891 (void)close(inblock.sock);
2896 /*************************************************
2897 * Prepare addresses for delivery *
2898 *************************************************/
2900 /* This function is called to flush out error settings from previous delivery
2901 attempts to other hosts. It also records whether we got here via an MX record
2902 or not in the more_errno field of the address. We are interested only in
2903 addresses that are still marked DEFER - others may have got delivered to a
2904 previously considered IP address. Set their status to PENDING_DEFER to indicate
2905 which ones are relevant this time.
2908 addrlist the list of addresses
2909 host the host we are delivering to
2911 Returns: the first address for this delivery
2914 static address_item *
2915 prepare_addresses(address_item *addrlist, host_item *host)
2917 address_item *first_addr = NULL;
2919 for (addr = addrlist; addr != NULL; addr = addr->next)
2920 if (addr->transport_return == DEFER)
2922 if (first_addr == NULL) first_addr = addr;
2923 addr->transport_return = PENDING_DEFER;
2924 addr->basic_errno = 0;
2925 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2926 addr->message = NULL;
2928 addr->cipher = NULL;
2929 addr->ourcert = NULL;
2930 addr->peercert = NULL;
2931 addr->peerdn = NULL;
2932 addr->ocsp = OCSP_NOT_REQ;
2940 /*************************************************
2941 * Main entry point *
2942 *************************************************/
2944 /* See local README for interface details. As this is a remote transport, it is
2945 given a chain of addresses to be delivered in one connection, if possible. It
2946 always returns TRUE, indicating that each address has its own independent
2947 status set, except if there is a setting up problem, in which case it returns
2951 smtp_transport_entry(
2952 transport_instance *tblock, /* data for this instantiation */
2953 address_item *addrlist) /* addresses we are working on */
2957 int hosts_defer = 0;
2959 int hosts_looked_up = 0;
2960 int hosts_retry = 0;
2961 int hosts_serial = 0;
2962 int hosts_total = 0;
2963 int total_hosts_tried = 0;
2965 BOOL expired = TRUE;
2966 BOOL continuing = continue_hostname != NULL;
2967 uschar *expanded_hosts = NULL;
2969 uschar *tid = string_sprintf("%s transport", tblock->name);
2970 smtp_transport_options_block *ob =
2971 (smtp_transport_options_block *)(tblock->options_block);
2972 host_item *hostlist = addrlist->host_list;
2973 host_item *host = NULL;
2977 debug_printf("%s transport entered\n", tblock->name);
2978 for (addr = addrlist; addr != NULL; addr = addr->next)
2979 debug_printf(" %s\n", addr->address);
2980 if (continuing) debug_printf("already connected to %s [%s]\n",
2981 continue_hostname, continue_host_address);
2984 /* Set the flag requesting that these hosts be added to the waiting
2985 database if the delivery fails temporarily or if we are running with
2986 queue_smtp or a 2-stage queue run. This gets unset for certain
2987 kinds of error, typically those that are specific to the message. */
2989 update_waiting = TRUE;
2991 /* If a host list is not defined for the addresses - they must all have the
2992 same one in order to be passed to a single transport - or if the transport has
2993 a host list with hosts_override set, use the host list supplied with the
2994 transport. It is an error for this not to exist. */
2996 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2998 if (ob->hosts == NULL)
3000 addrlist->message = string_sprintf("%s transport called with no hosts set",
3002 addrlist->transport_return = PANIC;
3003 return FALSE; /* Only top address has status */
3006 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3009 /* If the transport's host list contains no '$' characters, and we are not
3010 randomizing, it is fixed and therefore a chain of hosts can be built once
3011 and for all, and remembered for subsequent use by other calls to this
3012 transport. If, on the other hand, the host list does contain '$', or we are
3013 randomizing its order, we have to rebuild it each time. In the fixed case,
3014 as the hosts string will never be used again, it doesn't matter that we
3015 replace all the : characters with zeros. */
3017 if (ob->hostlist == NULL)
3019 uschar *s = ob->hosts;
3021 if (Ustrchr(s, '$') != NULL)
3023 if (!(expanded_hosts = expand_string(s)))
3025 addrlist->message = string_sprintf("failed to expand list of hosts "
3026 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3027 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3028 return FALSE; /* Only top address has status */
3030 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3031 "\"%s\"\n", s, expanded_hosts);
3035 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3037 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3039 /* Check that the expansion yielded something useful. */
3040 if (hostlist == NULL)
3043 string_sprintf("%s transport has empty hosts setting", tblock->name);
3044 addrlist->transport_return = PANIC;
3045 return FALSE; /* Only top address has status */
3048 /* If there was no expansion of hosts, save the host list for
3051 if (!expanded_hosts) ob->hostlist = hostlist;
3054 /* This is not the first time this transport has been run in this delivery;
3055 the host list was built previously. */
3058 hostlist = ob->hostlist;
3061 /* The host list was supplied with the address. If hosts_randomize is set, we
3062 must sort it into a random order if it did not come from MX records and has not
3063 already been randomized (but don't bother if continuing down an existing
3066 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3068 host_item *newlist = NULL;
3069 while (hostlist != NULL)
3071 host_item *h = hostlist;
3072 hostlist = hostlist->next;
3074 h->sort_key = random_number(100);
3076 if (newlist == NULL)
3081 else if (h->sort_key < newlist->sort_key)
3088 host_item *hh = newlist;
3089 while (hh->next != NULL)
3091 if (h->sort_key < hh->next->sort_key) break;
3099 hostlist = addrlist->host_list = newlist;
3102 /* Sort out the default port. */
3104 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3106 /* For each host-plus-IP-address on the list:
3108 . If this is a continued delivery and the host isn't the one with the
3109 current connection, skip.
3111 . If the status is unusable (i.e. previously failed or retry checked), skip.
3113 . If no IP address set, get the address, either by turning the name into
3114 an address, calling gethostbyname if gethostbyname is on, or by calling
3115 the DNS. The DNS may yield multiple addresses, in which case insert the
3116 extra ones into the list.
3118 . Get the retry data if not previously obtained for this address and set the
3119 field which remembers the state of this address. Skip if the retry time is
3120 not reached. If not, remember whether retry data was found. The retry string
3121 contains both the name and the IP address.
3123 . Scan the list of addresses and mark those whose status is DEFER as
3124 PENDING_DEFER. These are the only ones that will be processed in this cycle
3127 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3128 Some addresses may be successfully delivered, others may fail, and yet
3129 others may get temporary errors and so get marked DEFER.
3131 . The return from the delivery attempt is OK if a connection was made and a
3132 valid SMTP dialogue was completed. Otherwise it is DEFER.
3134 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3136 . If fail to connect, or other defer state, add a retry item.
3138 . If there are any addresses whose status is still DEFER, carry on to the
3139 next host/IPaddress, unless we have tried the number of hosts given
3140 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3141 there is some fancy logic for hosts_max_try that means its limit can be
3142 overstepped in some circumstances.
3144 If we get to the end of the list, all hosts have deferred at least one address,
3145 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3146 delivery attempt to those hosts whose last try was before the arrival time of
3147 the current message. To cope with this, we have to go round the loop a second
3148 time. After that, set the status and error data for any addresses that haven't
3149 had it set already. */
3151 for (cutoff_retry = 0; expired &&
3152 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3155 host_item *nexthost = NULL;
3156 int unexpired_hosts_tried = 0;
3158 for (host = hostlist;
3160 unexpired_hosts_tried < ob->hosts_max_try &&
3161 total_hosts_tried < ob->hosts_max_try_hardlimit;
3167 BOOL serialized = FALSE;
3168 BOOL host_is_expired = FALSE;
3169 BOOL message_defer = FALSE;
3170 BOOL ifchanges = FALSE;
3171 BOOL some_deferred = FALSE;
3172 address_item *first_addr = NULL;
3173 uschar *interface = NULL;
3174 uschar *retry_host_key = NULL;
3175 uschar *retry_message_key = NULL;
3176 uschar *serialize_key = NULL;
3178 /* Default next host is next host. :-) But this can vary if the
3179 hosts_max_try limit is hit (see below). It may also be reset if a host
3180 address is looked up here (in case the host was multihomed). */
3182 nexthost = host->next;
3184 /* If the address hasn't yet been obtained from the host name, look it up
3185 now, unless the host is already marked as unusable. If it is marked as
3186 unusable, it means that the router was unable to find its IP address (in
3187 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3188 the lookup failed last time. We don't get this far if *all* MX records
3189 point to non-existent hosts; that is treated as a hard error.
3191 We can just skip this host entirely. When the hosts came from the router,
3192 the address will timeout based on the other host(s); when the address is
3193 looked up below, there is an explicit retry record added.
3195 Note that we mustn't skip unusable hosts if the address is not unset; they
3196 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3198 if (host->address == NULL)
3200 int new_port, flags;
3203 if (host->status >= hstatus_unusable)
3205 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3210 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3212 /* The host name is permitted to have an attached port. Find it, and
3213 strip it from the name. Just remember it for now. */
3215 new_port = host_item_get_port(host);
3217 /* Count hosts looked up */
3221 /* Find by name if so configured, or if it's an IP address. We don't
3222 just copy the IP address, because we need the test-for-local to happen. */
3224 flags = HOST_FIND_BY_A;
3225 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3226 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3228 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3229 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3231 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3232 ob->dnssec_request_domains, ob->dnssec_require_domains,
3235 /* Update the host (and any additional blocks, resulting from
3236 multihoming) with a host-specific port, if any. */
3238 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3240 /* Failure to find the host at this time (usually DNS temporary failure)
3241 is really a kind of routing failure rather than a transport failure.
3242 Therefore we add a retry item of the routing kind, not to stop us trying
3243 to look this name up here again, but to ensure the address gets timed
3244 out if the failures go on long enough. A complete failure at this point
3245 commonly points to a configuration error, but the best action is still
3246 to carry on for the next host. */
3248 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3250 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3252 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3253 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3254 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3255 host->status = hstatus_unusable;
3257 for (addr = addrlist; addr != NULL; addr = addr->next)
3259 if (addr->transport_return != DEFER) continue;
3260 addr->basic_errno = ERRNO_UNKNOWNHOST;
3262 string_sprintf("failed to lookup IP address for %s", host->name);
3267 /* If the host is actually the local host, we may have a problem, or
3268 there may be some cunning configuration going on. In the problem case,
3269 log things and give up. The default transport status is already DEFER. */
3271 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3273 for (addr = addrlist; addr != NULL; addr = addr->next)
3275 addr->basic_errno = 0;
3276 addr->message = string_sprintf("%s transport found host %s to be "
3277 "local", tblock->name, host->name);
3281 } /* End of block for IP address lookup */
3283 /* If this is a continued delivery, we are interested only in the host
3284 which matches the name of the existing open channel. The check is put
3285 here after the local host lookup, in case the name gets expanded as a
3286 result of the lookup. Set expired FALSE, to save the outer loop executing
3289 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3290 Ustrcmp(continue_host_address, host->address) != 0))
3293 continue; /* With next host */
3296 /* Reset the default next host in case a multihomed host whose addresses
3297 are not looked up till just above added to the host list. */
3299 nexthost = host->next;
3301 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3302 domain is in queue_smtp_domains, we don't actually want to attempt any
3303 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3304 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3305 were not in it. We don't want to hold up all SMTP deliveries! Except when
3306 doing a two-stage queue run, don't do this if forcing. */
3308 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3309 match_isinlist(addrlist->domain,
3310 (const uschar **)&queue_smtp_domains, 0,
3311 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3314 for (addr = addrlist; addr != NULL; addr = addr->next)
3316 if (addr->transport_return != DEFER) continue;
3317 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3319 continue; /* With next host */
3322 /* Count hosts being considered - purely for an intelligent comment
3323 if none are usable. */
3327 /* Set $host and $host address now in case they are needed for the
3328 interface expansion or the serialize_hosts check; they remain set if an
3329 actual delivery happens. */
3331 deliver_host = host->name;
3332 deliver_host_address = host->address;
3333 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3334 : host->dnssec == DS_NO ? US"no"
3337 /* Set up a string for adding to the retry key if the port number is not
3338 the standard SMTP port. A host may have its own port setting that overrides
3341 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3343 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3345 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3346 string changes upon expansion, we must add it to the key that is used for
3347 retries, because connections to the same host from a different interface
3348 should be treated separately. */
3350 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3351 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3354 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3356 /* The first time round the outer loop, check the status of the host by
3357 inspecting the retry data. The second time round, we are interested only
3358 in expired hosts that haven't been tried since this message arrived. */
3360 if (cutoff_retry == 0)
3363 /* Ensure the status of the address is set by checking retry data if
3364 necessary. There may be host-specific retry data (applicable to all
3365 messages) and also data for retries of a specific message at this host.
3366 If either of these retry records are actually read, the keys used are
3367 returned to save recomputing them later. */
3369 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3370 US"retry_include_ip_address", ob->retry_include_ip_address,
3371 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3372 continue; /* with next host */
3374 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3375 incl_ip, &retry_host_key, &retry_message_key);
3377 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3378 (host->address == NULL)? US"" : host->address, pistring,
3379 (host->status == hstatus_usable)? "usable" :
3380 (host->status == hstatus_unusable)? "unusable" :
3381 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3383 /* Skip this address if not usable at this time, noting if it wasn't
3384 actually expired, both locally and in the address. */
3386 switch (host->status)
3388 case hstatus_unusable:
3390 setflag(addrlist, af_retry_skipped);
3393 case hstatus_unusable_expired:
3396 case hwhy_retry: hosts_retry++; break;
3397 case hwhy_failed: hosts_fail++; break;
3398 case hwhy_deferred: hosts_defer++; break;
3401 /* If there was a retry message key, implying that previously there
3402 was a message-specific defer, we don't want to update the list of
3403 messages waiting for these hosts. */
3405 if (retry_message_key != NULL) update_waiting = FALSE;
3406 continue; /* With the next host or IP address */
3410 /* Second time round the loop: if the address is set but expired, and
3411 the message is newer than the last try, let it through. */
3415 if (host->address == NULL ||
3416 host->status != hstatus_unusable_expired ||
3417 host->last_try > received_time)
3420 debug_printf("trying expired host %s [%s]%s\n",
3421 host->name, host->address, pistring);
3422 host_is_expired = TRUE;
3425 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3426 it remains TRUE only if all hosts are expired and none are actually tried.
3431 /* If this host is listed as one to which access must be serialized,
3432 see if another Exim process has a connection to it, and if so, skip
3433 this host. If not, update the database to record our connection to it
3434 and remember this for later deletion. Do not do any of this if we are
3435 sending the message down a pre-existing connection. */
3438 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3440 serialize_key = string_sprintf("host-serialize-%s", host->name);
3441 if (!enq_start(serialize_key))
3444 debug_printf("skipping host %s because another Exim process "
3445 "is connected to it\n", host->name);
3452 /* OK, we have an IP address that is not waiting for its retry time to
3453 arrive (it might be expired) OR (second time round the loop) we have an
3454 expired host that hasn't been tried since the message arrived. Have a go
3455 at delivering the message to it. First prepare the addresses by flushing
3456 out the result of previous attempts, and finding the first address that
3457 is still to be delivered. */
3459 first_addr = prepare_addresses(addrlist, host);
3461 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3462 message_id, host->name, host->address, addrlist->address,
3463 (addrlist->next == NULL)? "" : ", ...");
3465 set_process_info("delivering %s to %s [%s] (%s%s)",
3466 message_id, host->name, host->address, addrlist->address,
3467 (addrlist->next == NULL)? "" : ", ...");
3469 /* This is not for real; don't do the delivery. If there are
3470 any remaining hosts, list them. */
3475 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3476 for (addr = addrlist; addr != NULL; addr = addr->next)
3478 addr->host_used = host;
3479 addr->special_action = '*';
3480 addr->message = US"delivery bypassed by -N option";
3484 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3485 "*** host and remaining hosts:\n", tblock->name);
3486 for (host2 = host; host2 != NULL; host2 = host2->next)
3487 debug_printf(" %s [%s]\n", host2->name,
3488 (host2->address == NULL)? US"unset" : host2->address);
3493 /* This is for real. If the host is expired, we don't count it for
3494 hosts_max_retry. This ensures that all hosts must expire before an address
3495 is timed out, unless hosts_max_try_hardlimit (which protects against
3496 lunatic DNS configurations) is reached.
3498 If the host is not expired and we are about to hit the hosts_max_retry
3499 limit, check to see if there is a subsequent hosts with a different MX
3500 value. If so, make that the next host, and don't count this one. This is a
3501 heuristic to make sure that different MXs do get tried. With a normal kind
3502 of retry rule, they would get tried anyway when the earlier hosts were
3503 delayed, but if the domain has a "retry every time" type of rule - as is
3504 often used for the the very large ISPs, that won't happen. */
3509 /* Make a copy of the host if it is local to this invocation
3510 of the transport. */
3514 thost = store_get(sizeof(host_item));
3516 thost->name = string_copy(host->name);
3517 thost->address = string_copy(host->address);
3522 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3526 debug_printf("hosts_max_try limit reached with this host\n");
3527 for (h = host; h != NULL; h = h->next)
3528 if (h->mx != host->mx) break;
3532 unexpired_hosts_tried--;
3533 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3534 "and will be tried\n");
3538 /* Attempt the delivery. */
3540 total_hosts_tried++;
3541 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3542 &message_defer, FALSE);
3545 OK => connection made, each address contains its result;
3546 message_defer is set for message-specific defers (when all
3547 recipients are marked defer)
3548 DEFER => there was a non-message-specific delivery problem;
3549 ERROR => there was a problem setting up the arguments for a filter,
3550 or there was a problem with expanding added headers
3553 /* If the result is not OK, there was a non-message-specific problem.
3554 If the result is DEFER, we need to write to the logs saying what happened
3555 for this particular host, except in the case of authentication and TLS
3556 failures, where the log has already been written. If all hosts defer a
3557 general message is written at the end. */
3559 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3560 first_addr->basic_errno != ERRNO_TLSFAILURE)
3561 write_logs(first_addr, host);
3563 #ifdef EXPERIMENTAL_EVENT
3565 deferred_event_raise(first_addr, host);
3568 /* If STARTTLS was accepted, but there was a failure in setting up the
3569 TLS session (usually a certificate screwup), and the host is not in
3570 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3571 TLS forcibly turned off. We have to start from scratch with a new SMTP
3572 connection. That's why the retry is done from here, not from within
3573 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3574 session, so the in-clear transmission after those errors, if permitted,
3575 happens inside smtp_deliver().] */
3579 && first_addr->basic_errno == ERRNO_TLSFAILURE
3580 && ob->tls_tempfail_tryclear
3581 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3584 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3585 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3586 first_addr = prepare_addresses(addrlist, host);
3587 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3588 &message_defer, TRUE);
3589 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3590 write_logs(first_addr, host);
3591 # ifdef EXPERIMENTAL_EVENT
3593 deferred_event_raise(first_addr, host);
3596 #endif /*SUPPORT_TLS*/
3599 /* Delivery attempt finished */
3601 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3604 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3605 message_id, host->name, host->address, addrlist->address,
3606 (addrlist->next == NULL)? "" : " (& others)", rs);
3608 /* Release serialization if set up */
3610 if (serialized) enq_end(serialize_key);
3612 /* If the result is DEFER, or if a host retry record is known to exist, we
3613 need to add an item to the retry chain for updating the retry database
3614 at the end of delivery. We only need to add the item to the top address,
3615 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3616 for any other delivery attempts using the same address. (It is copied into
3617 the unusable tree at the outer level, so even if different address blocks
3618 contain the same address, it still won't get tried again.) */
3620 if (rc == DEFER || retry_host_key != NULL)
3622 int delete_flag = (rc != DEFER)? rf_delete : 0;
3623 if (retry_host_key == NULL)
3626 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3627 US"retry_include_ip_address", ob->retry_include_ip_address,
3628 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3629 incl_ip = TRUE; /* error; use most-specific retry record */
3631 retry_host_key = incl_ip ?
3632 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3633 string_sprintf("T:%S%s", host->name, pistring);
3636 /* If a delivery of another message over an existing SMTP connection
3637 yields DEFER, we do NOT set up retry data for the host. This covers the
3638 case when there are delays in routing the addresses in the second message
3639 that are so long that the server times out. This is alleviated by not
3640 routing addresses that previously had routing defers when handling an
3641 existing connection, but even so, this case may occur (e.g. if a
3642 previously happily routed address starts giving routing defers). If the
3643 host is genuinely down, another non-continued message delivery will
3644 notice it soon enough. */
3646 if (delete_flag != 0 || !continuing)
3647 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3649 /* We may have tried an expired host, if its retry time has come; ensure
3650 the status reflects the expiry for the benefit of any other addresses. */
3654 host->status = (host_is_expired)?
3655 hstatus_unusable_expired : hstatus_unusable;
3656 host->why = hwhy_deferred;
3660 /* If message_defer is set (host was OK, but every recipient got deferred
3661 because of some message-specific problem), or if that had happened
3662 previously so that a message retry key exists, add an appropriate item
3663 to the retry chain. Note that if there was a message defer but now there is
3664 a host defer, the message defer record gets deleted. That seems perfectly
3665 reasonable. Also, stop the message from being remembered as waiting
3666 for specific hosts. */
3668 if (message_defer || retry_message_key != NULL)
3670 int delete_flag = message_defer? 0 : rf_delete;
3671 if (retry_message_key == NULL)
3674 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3675 US"retry_include_ip_address", ob->retry_include_ip_address,
3676 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3677 incl_ip = TRUE; /* error; use most-specific retry record */
3679 retry_message_key = incl_ip ?
3680 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3682 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3684 retry_add_item(addrlist, retry_message_key,
3685 rf_message | rf_host | delete_flag);
3686 update_waiting = FALSE;
3689 /* Any return other than DEFER (that is, OK or ERROR) means that the
3690 addresses have got their final statuses filled in for this host. In the OK
3691 case, see if any of them are deferred. */
3695 for (addr = addrlist; addr != NULL; addr = addr->next)
3697 if (addr->transport_return == DEFER)
3699 some_deferred = TRUE;
3705 /* If no addresses deferred or the result was ERROR, return. We do this for
3706 ERROR because a failing filter set-up or add_headers expansion is likely to
3707 fail for any host we try. */
3709 if (rc == ERROR || (rc == OK && !some_deferred))
3711 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3712 return TRUE; /* Each address has its status */
3715 /* If the result was DEFER or some individual addresses deferred, let
3716 the loop run to try other hosts with the deferred addresses, except for the
3717 case when we were trying to deliver down an existing channel and failed.
3718 Don't try any other hosts in this case. */
3720 if (continuing) break;
3722 /* If the whole delivery, or some individual addresses, were deferred and
3723 there are more hosts that could be tried, do not count this host towards
3724 the hosts_max_try limit if the age of the message is greater than the
3725 maximum retry time for this host. This means we may try try all hosts,
3726 ignoring the limit, when messages have been around for some time. This is
3727 important because if we don't try all hosts, the address will never time
3728 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3730 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3733 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3735 if (retry != NULL && retry->rules != NULL)
3737 retry_rule *last_rule;
3738 for (last_rule = retry->rules;
3739 last_rule->next != NULL;
3740 last_rule = last_rule->next);
3741 timedout = time(NULL) - received_time > last_rule->timeout;
3743 else timedout = TRUE; /* No rule => timed out */
3747 unexpired_hosts_tried--;
3748 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3749 "hosts_max_try (message older than host's retry time)\n");
3752 } /* End of loop for trying multiple hosts. */
3754 /* This is the end of the loop that repeats iff expired is TRUE and
3755 ob->delay_after_cutoff is FALSE. The second time round we will
3756 try those hosts that haven't been tried since the message arrived. */
3760 debug_printf("all IP addresses skipped or deferred at least one address\n");
3761 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3762 debug_printf("retrying IP addresses not tried since message arrived\n");
3767 /* Get here if all IP addresses are skipped or defer at least one address. In
3768 MUA wrapper mode, this will happen only for connection or other non-message-
3769 specific failures. Force the delivery status for all addresses to FAIL. */
3773 for (addr = addrlist; addr != NULL; addr = addr->next)
3774 addr->transport_return = FAIL;
3778 /* In the normal, non-wrapper case, add a standard message to each deferred
3779 address if there hasn't been an error, that is, if it hasn't actually been
3780 tried this time. The variable "expired" will be FALSE if any deliveries were
3781 actually tried, or if there was at least one host that was not expired. That
3782 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3783 a delivery has been tried, an error code will be set, and the failing of the
3784 message is handled by the retry code later.
3786 If queue_smtp is set, or this transport was called to send a subsequent message
3787 down an existing TCP/IP connection, and something caused the host not to be
3788 found, we end up here, but can detect these cases and handle them specially. */
3790 for (addr = addrlist; addr != NULL; addr = addr->next)
3792 /* If host is not NULL, it means that we stopped processing the host list
3793 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3794 means we need to behave as if some hosts were skipped because their retry
3795 time had not come. Specifically, this prevents the address from timing out.
3796 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3797 hosts were tried. */
3801 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3804 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3805 "hosts were tried\n");
3810 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3811 setflag(addr, af_retry_skipped);
3815 if (queue_smtp) /* no deliveries attempted */
3817 addr->transport_return = DEFER;
3818 addr->basic_errno = 0;
3819 addr->message = US"SMTP delivery explicitly queued";
3822 else if (addr->transport_return == DEFER &&
3823 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3824 addr->message == NULL)
3826 addr->basic_errno = ERRNO_HRETRY;
3827 if (continue_hostname != NULL)
3829 addr->message = US"no host found for existing SMTP connection";
3833 setflag(addr, af_pass_message); /* This is not a security risk */
3834 addr->message = (ob->delay_after_cutoff)?
3835 US"retry time not reached for any host after a long failure period" :
3836 US"all hosts have been failing for a long time and were last tried "
3837 "after this message arrived";
3839 /* If we are already using fallback hosts, or there are no fallback hosts
3840 defined, convert the result to FAIL to cause a bounce. */
3842 if (addr->host_list == addr->fallback_hosts ||
3843 addr->fallback_hosts == NULL)
3844 addr->transport_return = FAIL;
3848 if (hosts_retry == hosts_total)
3849 addr->message = US"retry time not reached for any host";
3850 else if (hosts_fail == hosts_total)
3851 addr->message = US"all host address lookups failed permanently";
3852 else if (hosts_defer == hosts_total)
3853 addr->message = US"all host address lookups failed temporarily";
3854 else if (hosts_serial == hosts_total)
3855 addr->message = US"connection limit reached for all hosts";
3856 else if (hosts_fail+hosts_defer == hosts_total)
3857 addr->message = US"all host address lookups failed";
3858 else addr->message = US"some host address lookups failed and retry time "
3859 "not reached for other hosts or connection limit reached";
3864 /* Update the database which keeps information about which messages are waiting
3865 for which hosts to become available. For some message-specific errors, the
3866 update_waiting flag is turned off because we don't want follow-on deliveries in
3867 those cases. If this transport instance is explicitly limited to one message
3868 per connection then follow-on deliveries are not possible and there's no need
3869 to create/update the per-transport wait-<transport_name> database. */
3871 if (update_waiting && tblock->connection_max_messages != 1)
3872 transport_update_waiting(hostlist, tblock->name);
3876 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3878 return TRUE; /* Each address has its status */
3883 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob