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_offered = FALSE;
1371 BOOL dsn_all_lasthop = TRUE;
1372 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1375 dns_answer tlsa_dnsa;
1377 smtp_inblock inblock;
1378 smtp_outblock outblock;
1379 int max_rcpt = tblock->max_addresses;
1380 uschar *igquotstr = US"";
1382 uschar *helo_data = NULL;
1384 uschar *message = NULL;
1385 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1387 uschar buffer[4096];
1388 uschar inbuffer[4096];
1389 uschar outbuffer[4096];
1390 address_item * current_address;
1392 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1394 *message_defer = FALSE;
1395 smtp_command = US"initial connection";
1396 if (max_rcpt == 0) max_rcpt = 999999;
1398 /* Set up the buffer for reading SMTP response packets. */
1400 inblock.buffer = inbuffer;
1401 inblock.buffersize = sizeof(inbuffer);
1402 inblock.ptr = inbuffer;
1403 inblock.ptrend = inbuffer;
1405 /* Set up the buffer for holding SMTP commands while pipelining */
1407 outblock.buffer = outbuffer;
1408 outblock.buffersize = sizeof(outbuffer);
1409 outblock.ptr = outbuffer;
1410 outblock.cmd_count = 0;
1411 outblock.authenticating = FALSE;
1413 /* Reset the parameters of a TLS session. */
1416 tls_out.cipher = NULL; /* the one we may use for this transport */
1417 tls_out.ourcert = NULL;
1418 tls_out.peercert = NULL;
1419 tls_out.peerdn = NULL;
1420 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1423 tls_out.ocsp = OCSP_NOT_REQ;
1425 /* Flip the legacy TLS-related variables over to the outbound set in case
1426 they're used in the context of the transport. Don't bother resetting
1427 afterward as we're in a subprocess. */
1429 tls_modify_variables(&tls_out);
1434 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1435 DEFER, FALSE, NULL);
1440 /* Make a connection to the host if this isn't a continued delivery, and handle
1441 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1442 specially so they can be identified for retries. */
1444 if (continue_hostname == NULL)
1446 /* This puts port into host->port */
1447 inblock.sock = outblock.sock =
1448 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1450 if (inblock.sock < 0)
1452 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1453 NULL, DEFER, FALSE, NULL);
1457 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1459 tls_out.dane_verified = FALSE;
1460 tls_out.tlsa_usage = 0;
1462 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1464 if (host->dnssec == DS_YES)
1467 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1469 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1473 else if (dane_required)
1475 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1480 ob->tls_tempfail_tryclear = FALSE;
1484 /* Expand the greeting message while waiting for the initial response. (Makes
1485 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1486 delayed till here so that $sending_interface and $sending_port are set. */
1488 helo_data = expand_string(ob->helo_data);
1489 #ifdef EXPERIMENTAL_INTERNATIONAL
1492 uschar * errstr = NULL;
1493 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1495 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1496 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1503 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1504 is nevertheless a reasonably clean way of programming this kind of logic,
1505 where you want to escape on any error. */
1509 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1510 ob->command_timeout)) goto RESPONSE_FAILED;
1512 #ifdef EXPERIMENTAL_EVENT
1515 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1516 : host->dnssec==DS_NO ? US"no" : NULL;
1517 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1520 set_errno(addrlist, ERRNO_EXPANDFAIL,
1521 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1522 DEFER, FALSE, NULL);
1529 /* Now check if the helo_data expansion went well, and sign off cleanly if
1532 if (helo_data == NULL)
1534 uschar *message = string_sprintf("failed to expand helo_data: %s",
1535 expand_string_message);
1536 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1542 /** Debugging without sending a message
1543 addrlist->transport_return = DEFER;
1547 /* Errors that occur after this point follow an SMTP command, which is
1548 left in big_buffer by smtp_write_command() for use in error messages. */
1550 smtp_command = big_buffer;
1552 /* Tell the remote who we are...
1554 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1555 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1556 greeting is of this form. The assumption was that the far end supports it
1557 properly... but experience shows that there are some that give 5xx responses,
1558 even though the banner includes "ESMTP" (there's a bloody-minded one that
1559 says "ESMTP not spoken here"). Cope with that case.
1561 September 2000: Time has passed, and it seems reasonable now to always send
1562 EHLO at the start. It is also convenient to make the change while installing
1565 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1566 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1567 would be no way to send out the mails, so there is now a host list
1568 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1569 PIPELINING problem as well. Maybe it can also be useful to cure other
1570 problems with broken servers.
1572 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1573 Then somebody tried it with a Microsoft mailer... It seems that all other
1574 mailers use upper case for some reason (the RFC is quite clear about case
1575 independence) so, for peace of mind, I gave in. */
1577 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1579 /* Alas; be careful, since this goto is not an error-out, so conceivably
1580 we might set data between here and the target which we assume to exist
1581 and be usable. I can see this coming back to bite us. */
1586 suppress_tls = FALSE;
1587 ob->tls_tempfail_tryclear = FALSE;
1588 smtp_command = US"SSL-on-connect";
1595 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1596 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1598 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1599 ob->command_timeout))
1601 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1608 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1613 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1615 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1616 ob->command_timeout)) goto RESPONSE_FAILED;
1619 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1620 lmtp_ignore_quota option was set. */
1622 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1623 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1624 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1626 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1629 tls_offered = esmtp &&
1630 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1631 PCRE_EOPT, NULL, 0) >= 0;
1634 #ifndef DISABLE_PRDR
1635 prdr_offered = esmtp
1636 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1637 PCRE_EOPT, NULL, 0) >= 0
1638 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1641 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1644 #ifdef EXPERIMENTAL_INTERNATIONAL
1645 utf8_offered = esmtp
1646 && addrlist->prop.utf8
1647 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1648 PCRE_EOPT, NULL, 0) >= 0;
1652 /* For continuing deliveries down the same channel, the socket is the standard
1653 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1654 below). Set up the pointer to where subsequent commands will be left, for
1655 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1656 set from the command line if they were set in the process that passed the
1661 inblock.sock = outblock.sock = fileno(stdin);
1662 smtp_command = big_buffer;
1663 host->port = port; /* Record the port that was used */
1666 /* If TLS is available on this connection, whether continued or not, attempt to
1667 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1668 send another EHLO - the server may give a different answer in secure mode. We
1669 use a separate buffer for reading the response to STARTTLS so that if it is
1670 negative, the original EHLO data is available for subsequent analysis, should
1671 the client not be required to use TLS. If the response is bad, copy the buffer
1672 for error analysis. */
1677 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1679 uschar buffer2[4096];
1680 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1683 /* If there is an I/O error, transmission of this message is deferred. If
1684 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1685 false, we also defer. However, if there is a temporary rejection of STARTTLS
1686 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1687 STARTTLS, we carry on. This means we will try to send the message in clear,
1688 unless the host is in hosts_require_tls (tested below). */
1690 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1691 ob->command_timeout))
1693 if (errno != 0 || buffer2[0] == 0 ||
1694 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1696 Ustrncpy(buffer, buffer2, sizeof(buffer));
1697 goto RESPONSE_FAILED;
1701 /* STARTTLS accepted: try to negotiate a TLS session. */
1706 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1707 # ifdef EXPERIMENTAL_DANE
1708 , dane ? &tlsa_dnsa : NULL
1712 /* TLS negotiation failed; give an error. From outside, this function may
1713 be called again to try in clear on a new connection, if the options permit
1714 it for this host. */
1718 # ifdef EXPERIMENTAL_DANE
1719 if (rc == DEFER && dane && !dane_required)
1721 log_write(0, LOG_MAIN, "DANE attempt failed;"
1722 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1723 host->name, host->address);
1729 save_errno = ERRNO_TLSFAILURE;
1730 message = US"failure while setting up TLS session";
1735 /* TLS session is set up */
1737 for (addr = addrlist; addr != NULL; addr = addr->next)
1738 if (addr->transport_return == PENDING_DEFER)
1740 addr->cipher = tls_out.cipher;
1741 addr->ourcert = tls_out.ourcert;
1742 addr->peercert = tls_out.peercert;
1743 addr->peerdn = tls_out.peerdn;
1744 addr->ocsp = tls_out.ocsp;
1749 /* if smtps, we'll have smtp_command set to something else; always safe to
1751 smtp_command = big_buffer;
1753 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1754 helo_data is null, we are dealing with a connection that was passed from
1755 another process, and so we won't have expanded helo_data above. We have to
1756 expand it here. $sending_ip_address and $sending_port are set up right at the
1757 start of the Exim process (in exim.c). */
1759 if (tls_out.active >= 0)
1762 if (helo_data == NULL)
1764 helo_data = expand_string(ob->helo_data);
1765 if (helo_data == NULL)
1767 uschar *message = string_sprintf("failed to expand helo_data: %s",
1768 expand_string_message);
1769 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1775 /* For SMTPS we need to wait for the initial OK response. */
1778 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1779 ob->command_timeout)) goto RESPONSE_FAILED;
1783 greeting_cmd = "EHLO";
1786 greeting_cmd = "HELO";
1788 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1791 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1792 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1794 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1795 ob->command_timeout))
1796 goto RESPONSE_FAILED;
1799 /* If the host is required to use a secure channel, ensure that we
1803 # ifdef EXPERIMENTAL_DANE
1806 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1809 save_errno = ERRNO_TLSREQUIRED;
1810 message = string_sprintf("a TLS session is required, but %s",
1811 tls_offered? "an attempt to start TLS failed" :
1812 "the server did not offer TLS support");
1815 #endif /*SUPPORT_TLS*/
1817 /* If TLS is active, we have just started it up and re-done the EHLO command,
1818 so its response needs to be analyzed. If TLS is not active and this is a
1819 continued session down a previously-used socket, we haven't just done EHLO, so
1822 if (continue_hostname == NULL
1824 || tls_out.active >= 0
1828 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1829 lmtp_ignore_quota option was set. */
1831 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1832 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1833 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1835 /* If the response to EHLO specified support for the SIZE parameter, note
1836 this, provided size_addition is non-negative. */
1838 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1839 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1840 PCRE_EOPT, NULL, 0) >= 0;
1842 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1843 the current host, esmtp will be false, so PIPELINING can never be used. If
1844 the current host matches hosts_avoid_pipelining, don't do it. */
1846 smtp_use_pipelining = esmtp
1847 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1848 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1849 PCRE_EOPT, NULL, 0) >= 0;
1851 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1852 smtp_use_pipelining? "" : "not ");
1854 #ifndef DISABLE_PRDR
1855 prdr_offered = esmtp
1856 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1857 PCRE_EOPT, NULL, 0) >= 0
1858 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1861 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1864 #ifdef EXPERIMENTAL_INTERNATIONAL
1865 utf8_offered = esmtp
1866 && addrlist->prop.utf8
1867 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1868 PCRE_EOPT, NULL, 0) >= 0;
1871 /* Note if the server supports DSN */
1872 smtp_use_dsn = esmtp
1873 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1874 PCRE_EOPT, NULL, 0) >= 0;
1875 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1877 /* Note if the response to EHLO specifies support for the AUTH extension.
1878 If it has, check that this host is one we want to authenticate to, and do
1879 the business. The host name and address must be available when the
1880 authenticator's client driver is running. */
1882 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1883 ob, esmtp, &inblock, &outblock))
1885 default: goto SEND_QUIT;
1887 case FAIL_SEND: goto SEND_FAILED;
1888 case FAIL: goto RESPONSE_FAILED;
1892 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1893 message-specific. */
1897 #ifdef EXPERIMENTAL_INTERNATIONAL
1898 /* If this is an international message we need the host to speak SMTPUTF8 */
1899 if (addrlist->prop.utf8 && !utf8_offered)
1901 errno = ERRNO_UTF8_FWD;
1902 goto RESPONSE_FAILED;
1906 /* If there is a filter command specified for this transport, we can now
1907 set it up. This cannot be done until the identify of the host is known. */
1909 if (tblock->filter_command != NULL)
1913 sprintf(CS buffer, "%.50s transport", tblock->name);
1914 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1915 TRUE, DEFER, addrlist, buffer, NULL);
1916 transport_filter_timeout = tblock->filter_timeout;
1918 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1923 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1931 /* For messages that have more than the maximum number of envelope recipients,
1932 we want to send several transactions down the same SMTP connection. (See
1933 comments in deliver.c as to how this reconciles, heuristically, with
1934 remote_max_parallel.) This optimization was added to Exim after the following
1935 code was already working. The simplest way to put it in without disturbing the
1936 code was to use a goto to jump back to this point when there is another
1937 transaction to handle. */
1940 sync_addr = first_addr;
1944 completed_address = FALSE;
1947 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1948 qualification, send it, adding something to the message size to allow for
1949 imprecision and things that get added en route. Exim keeps the number of lines
1950 in a message, so we can give an accurate value for the original message, but we
1951 need some additional to handle added headers. (Double "." characters don't get
1952 included in the count.) */
1959 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1963 #ifndef DISABLE_PRDR
1964 prdr_active = FALSE;
1967 for (addr = first_addr; addr; addr = addr->next)
1968 if (addr->transport_return == PENDING_DEFER)
1970 for (addr = addr->next; addr; addr = addr->next)
1971 if (addr->transport_return == PENDING_DEFER)
1972 { /* at least two recipients to send */
1974 sprintf(CS p, " PRDR"); p += 5;
1982 #ifdef EXPERIMENTAL_INTERNATIONAL
1983 if (addrlist->prop.utf8)
1984 sprintf(CS p, " SMTPUTF8"), p += 9;
1987 /* check if all addresses have lasthop flag */
1988 /* do not send RET and ENVID if true */
1989 for (dsn_all_lasthop = TRUE, addr = first_addr;
1990 address_count < max_rcpt && addr != NULL;
1992 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1994 dsn_all_lasthop = FALSE;
1998 /* Add any DSN flags to the mail command */
2000 if (smtp_use_dsn && !dsn_all_lasthop)
2002 if (dsn_ret == dsn_ret_hdrs)
2004 Ustrcpy(p, " RET=HDRS");
2007 else if (dsn_ret == dsn_ret_full)
2009 Ustrcpy(p, " RET=FULL");
2012 if (dsn_envid != NULL)
2014 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2019 /* If an authenticated_sender override has been specified for this transport
2020 instance, expand it. If the expansion is forced to fail, and there was already
2021 an authenticated_sender for this message, the original value will be used.
2022 Other expansion failures are serious. An empty result is ignored, but there is
2023 otherwise no check - this feature is expected to be used with LMTP and other
2024 cases where non-standard addresses (e.g. without domains) might be required. */
2026 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2032 /* From here until we send the DATA command, we can make use of PIPELINING
2033 if the server host supports it. The code has to be able to check the responses
2034 at any point, for when the buffer fills up, so we write it totally generally.
2035 When PIPELINING is off, each command written reports that it has flushed the
2038 pending_MAIL = TRUE; /* The block starts with MAIL */
2040 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2041 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
2042 mail_command = string_copy(big_buffer); /* Save for later error message */
2046 case -1: /* Transmission error */
2049 case +1: /* Block was sent */
2050 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2051 ob->command_timeout))
2053 if (errno == 0 && buffer[0] == '4')
2055 errno = ERRNO_MAIL4XX;
2056 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2058 goto RESPONSE_FAILED;
2060 pending_MAIL = FALSE;
2064 /* Pass over all the relevant recipient addresses for this host, which are the
2065 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2066 several before we have to read the responses for those seen so far. This
2067 checking is done by a subroutine because it also needs to be done at the end.
2068 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2069 the next one if not all are sent.
2071 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2072 last address because we want to abort if any recipients have any kind of
2073 problem, temporary or permanent. We know that all recipient addresses will have
2074 the PENDING_DEFER status, because only one attempt is ever made, and we know
2075 that max_rcpt will be large, so all addresses will be done at once. */
2077 for (addr = first_addr;
2078 address_count < max_rcpt && addr != NULL;
2084 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2086 if (addr->transport_return != PENDING_DEFER) continue;
2089 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2091 /* Add any DSN flags to the rcpt command and add to the sent string */
2096 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2098 if ((addr->dsn_flags & rf_dsnflags) != 0)
2102 Ustrcpy(p, " NOTIFY=");
2104 for (i = 0; i < 4; i++)
2105 if ((addr->dsn_flags & rf_list[i]) != 0)
2107 if (!first) *p++ = ',';
2109 Ustrcpy(p, rf_names[i]);
2114 if (addr->dsn_orcpt != NULL)
2116 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2122 /* Now send the RCPT command, and process outstanding responses when
2123 necessary. After a timeout on RCPT, we just end the function, leaving the
2124 yield as OK, because this error can often mean that there is a problem with
2125 just one address, so we don't want to delay the host. */
2127 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2128 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
2130 if (count < 0) goto SEND_FAILED;
2133 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2134 &sync_addr, host, count, ob->address_retry_include_sender,
2135 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2138 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2139 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2142 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2143 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2144 case 0: /* No 2xx or 5xx, but no probs */
2147 case -1: goto END_OFF; /* Timeout on RCPT */
2148 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2150 pending_MAIL = FALSE; /* Dealt with MAIL */
2152 } /* Loop for next address */
2154 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2155 permanently or temporarily. We should have flushed and synced after the last
2160 address_item *badaddr;
2161 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2162 if (badaddr->transport_return != PENDING_OK)
2164 /*XXX could we find a better errno than 0 here? */
2165 set_errno(addrlist, 0, badaddr->message, FAIL,
2166 testflag(badaddr, af_pass_message), NULL);
2172 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2173 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2174 have a good recipient buffered up if we are pipelining. We don't want to waste
2175 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2176 are pipelining. The responses are all handled by sync_responses(). */
2178 if (ok || (smtp_use_pipelining && !mua_wrapper))
2180 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2181 if (count < 0) goto SEND_FAILED;
2182 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2183 host, count, ob->address_retry_include_sender, pending_MAIL,
2184 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(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: break; /* No 2xx or 5xx, but no probs */
2194 case -1: goto END_OFF; /* Timeout on RCPT */
2195 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2199 /* Save the first address of the next batch. */
2203 /* If there were no good recipients (but otherwise there have been no
2204 problems), just set ok TRUE, since we have handled address-specific errors
2205 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2206 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2207 well as body. Set the appropriate timeout value to be used for each chunk.
2208 (Haven't been able to make it work using select() for writing yet.) */
2210 if (!ok) ok = TRUE; else
2212 sigalrm_seen = FALSE;
2213 transport_write_timeout = ob->data_timeout;
2214 smtp_command = US"sending data block"; /* For error messages */
2215 DEBUG(D_transport|D_v)
2216 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2217 transport_count = 0;
2219 #ifndef DISABLE_DKIM
2220 ok = dkim_transport_write_message(addrlist, inblock.sock,
2221 topt_use_crlf | topt_end_dot | topt_escape_headers |
2222 (tblock->body_only? topt_no_headers : 0) |
2223 (tblock->headers_only? topt_no_body : 0) |
2224 (tblock->return_path_add? topt_add_return_path : 0) |
2225 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2226 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2227 0, /* No size limit */
2228 tblock->add_headers, tblock->remove_headers,
2229 US".", US"..", /* Escaping strings */
2230 tblock->rewrite_rules, tblock->rewrite_existflags,
2231 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2232 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2235 ok = transport_write_message(addrlist, inblock.sock,
2236 topt_use_crlf | topt_end_dot | topt_escape_headers |
2237 (tblock->body_only? topt_no_headers : 0) |
2238 (tblock->headers_only? topt_no_body : 0) |
2239 (tblock->return_path_add? topt_add_return_path : 0) |
2240 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2241 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2242 0, /* No size limit */
2243 tblock->add_headers, tblock->remove_headers,
2244 US".", US"..", /* Escaping strings */
2245 tblock->rewrite_rules, tblock->rewrite_existflags);
2248 /* transport_write_message() uses write() because it is called from other
2249 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2250 it can exit with "Broken pipe" as its error. This really means that the
2251 socket got closed at the far end. */
2253 transport_write_timeout = 0; /* for subsequent transports */
2255 /* Failure can either be some kind of I/O disaster (including timeout),
2256 or the failure of a transport filter or the expansion of added headers. */
2260 buffer[0] = 0; /* There hasn't been a response */
2261 goto RESPONSE_FAILED;
2264 /* We used to send the terminating "." explicitly here, but because of
2265 buffering effects at both ends of TCP/IP connections, you don't gain
2266 anything by keeping it separate, so it might as well go in the final
2267 data buffer for efficiency. This is now done by setting the topt_end_dot
2270 smtp_command = US"end of data";
2272 #ifndef DISABLE_PRDR
2273 /* For PRDR we optionally get a partial-responses warning
2274 * followed by the individual responses, before going on with
2275 * the overall response. If we don't get the warning then deal
2276 * with per non-PRDR. */
2279 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2281 if (!ok && errno == 0)
2284 case '2': prdr_active = FALSE;
2287 case '4': errno = ERRNO_DATA4XX;
2288 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2295 /* For non-PRDR SMTP, we now read a single response that applies to the
2296 whole message. If it is OK, then all the addresses have been delivered. */
2300 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2302 if (!ok && errno == 0 && buffer[0] == '4')
2304 errno = ERRNO_DATA4XX;
2305 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2309 /* For LMTP, we get back a response for every RCPT command that we sent;
2310 some may be accepted and some rejected. For those that get a response, their
2311 status is fixed; any that are accepted have been handed over, even if later
2312 responses crash - at least, that's how I read RFC 2033.
2314 If all went well, mark the recipient addresses as completed, record which
2315 host/IPaddress they were delivered to, and cut out RSET when sending another
2316 message down the same channel. Write the completed addresses to the journal
2317 now so that they are recorded in case there is a crash of hardware or
2318 software before the spool gets updated. Also record the final SMTP
2319 confirmation if needed (for SMTP only). */
2324 int delivery_time = (int)(time(NULL) - start_delivery_time);
2326 uschar *conf = NULL;
2329 /* Set up confirmation if needed - applies only to SMTP */
2332 #ifndef EXPERIMENTAL_EVENT
2333 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2338 const uschar *s = string_printing(buffer);
2339 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2340 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2343 /* Process all transported addresses - for LMTP or PRDR, read a status for
2346 for (addr = addrlist; addr != first_addr; addr = addr->next)
2348 if (addr->transport_return != PENDING_OK) continue;
2350 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2351 remaining addresses. Otherwise, it's a return code for just the one
2352 address. For temporary errors, add a retry item for the address so that
2353 it doesn't get tried again too soon. */
2355 #ifndef DISABLE_PRDR
2356 if (lmtp || prdr_active)
2361 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2364 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2365 addr->message = string_sprintf(
2366 #ifndef DISABLE_PRDR
2367 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2369 "LMTP error after %s: %s",
2371 big_buffer, string_printing(buffer));
2372 setflag(addr, af_pass_message); /* Allow message to go to user */
2373 if (buffer[0] == '5')
2374 addr->transport_return = FAIL;
2377 errno = ERRNO_DATA4XX;
2378 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2379 addr->transport_return = DEFER;
2380 #ifndef DISABLE_PRDR
2383 retry_add_item(addr, addr->address_retry_key, 0);
2387 completed_address = TRUE; /* NOW we can set this flag */
2388 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2390 const uschar *s = string_printing(buffer);
2391 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2392 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2396 /* SMTP, or success return from LMTP for this address. Pass back the
2397 actual host that was used. */
2399 addr->transport_return = OK;
2400 addr->more_errno = delivery_time;
2401 addr->host_used = host;
2402 addr->special_action = flag;
2403 addr->message = conf;
2404 #ifndef DISABLE_PRDR
2405 if (prdr_active) addr->flags |= af_prdr_used;
2409 #ifndef DISABLE_PRDR
2413 /* Update the journal. For homonymic addresses, use the base address plus
2414 the transport name. See lots of comments in deliver.c about the reasons
2415 for the complications when homonyms are involved. Just carry on after
2416 write error, as it may prove possible to update the spool file later. */
2418 if (testflag(addr, af_homonym))
2419 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2421 sprintf(CS buffer, "%.500s\n", addr->unique);
2423 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2424 len = Ustrlen(CS buffer);
2425 if (write(journal_fd, buffer, len) != len)
2426 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2427 "%s: %s", buffer, strerror(errno));
2431 #ifndef DISABLE_PRDR
2434 /* PRDR - get the final, overall response. For any non-success
2435 upgrade all the address statuses. */
2436 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2440 if(errno == 0 && buffer[0] == '4')
2442 errno = ERRNO_DATA4XX;
2443 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2445 for (addr = addrlist; addr != first_addr; addr = addr->next)
2446 if (buffer[0] == '5' || addr->transport_return == OK)
2447 addr->transport_return = PENDING_OK; /* allow set_errno action */
2448 goto RESPONSE_FAILED;
2451 /* Update the journal, or setup retry. */
2452 for (addr = addrlist; addr != first_addr; addr = addr->next)
2453 if (addr->transport_return == OK)
2455 if (testflag(addr, af_homonym))
2456 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2458 sprintf(CS buffer, "%.500s\n", addr->unique);
2460 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2461 len = Ustrlen(CS buffer);
2462 if (write(journal_fd, buffer, len) != len)
2463 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2464 "%s: %s", buffer, strerror(errno));
2466 else if (addr->transport_return == DEFER)
2467 retry_add_item(addr, addr->address_retry_key, -2);
2471 /* Ensure the journal file is pushed out to disk. */
2473 if (EXIMfsync(journal_fd) < 0)
2474 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2480 /* Handle general (not specific to one address) failures here. The value of ok
2481 is used to skip over this code on the falling through case. A timeout causes a
2482 deferral. Other errors may defer or fail according to the response code, and
2483 may set up a special errno value, e.g. after connection chopped, which is
2484 assumed if errno == 0 and there is no text in the buffer. If control reaches
2485 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2486 the problem is not related to this specific message. */
2495 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2496 buffer, &code, &message, &pass_message);
2502 message = US string_sprintf("send() to %s [%s] failed: %s",
2503 host->name, host->address, strerror(save_errno));
2507 /* This label is jumped to directly when a TLS negotiation has failed,
2508 or was not done for a host for which it is required. Values will be set
2509 in message and save_errno, and setting_up will always be true. Treat as
2510 a temporary error. */
2517 /* If the failure happened while setting up the call, see if the failure was
2518 a 5xx response (this will either be on connection, or following HELO - a 5xx
2519 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2520 never going to accept them. For other errors during setting up (timeouts or
2521 whatever), defer all addresses, and yield DEFER, so that the host is not
2522 tried again for a while. */
2525 ok = FALSE; /* For when reached by GOTO */
2530 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2533 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2538 /* We want to handle timeouts after MAIL or "." and loss of connection after
2539 "." specially. They can indicate a problem with the sender address or with
2540 the contents of the message rather than a real error on the connection. These
2541 cases are treated in the same way as a 4xx response. This next bit of code
2542 does the classification. */
2550 #ifdef EXPERIMENTAL_INTERNATIONAL
2551 case ERRNO_UTF8_FWD:
2558 message_error = TRUE;
2562 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2563 Ustrncmp(smtp_command,"end ",4) == 0;
2566 case ERRNO_SMTPCLOSED:
2567 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2571 message_error = FALSE;
2575 /* Handle the cases that are treated as message errors. These are:
2577 (a) negative response or timeout after MAIL
2578 (b) negative response after DATA
2579 (c) negative response or timeout or dropped connection after "."
2580 (d) utf8 support required and not offered
2582 It won't be a negative response or timeout after RCPT, as that is dealt
2583 with separately above. The action in all cases is to set an appropriate
2584 error code for all the addresses, but to leave yield set to OK because the
2585 host itself has not failed. Of course, it might in practice have failed
2586 when we've had a timeout, but if so, we'll discover that at the next
2587 delivery attempt. For a temporary error, set the message_defer flag, and
2588 write to the logs for information if this is not the last host. The error
2589 for the last host will be logged as part of the address's log line. */
2593 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2594 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2595 pass_message, host);
2597 /* If there's an errno, the message contains just the identity of
2600 if (code != '5') /* Anything other than 5 is treated as temporary */
2603 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2604 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2605 msglog_line(host, message);
2606 *message_defer = TRUE;
2610 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2611 ".", or some other transportation error. We defer all addresses and yield
2612 DEFER, except for the case of failed add_headers expansion, or a transport
2613 filter failure, when the yield should be ERROR, to stop it trying other
2618 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2619 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2620 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2626 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2627 SMTP session tidily. However, if there were too many addresses to send in one
2628 message (indicated by first_addr being non-NULL) we want to carry on with the
2629 rest of them. Also, it is desirable to send more than one message down the SMTP
2630 connection if there are several waiting, provided we haven't already sent so
2631 many as to hit the configured limit. The function transport_check_waiting looks
2632 for a waiting message and returns its id. Then transport_pass_socket tries to
2633 set up a continued delivery by passing the socket on to another process. The
2634 variable send_rset is FALSE if a message has just been successfully transfered.
2636 If we are already sending down a continued channel, there may be further
2637 addresses not yet delivered that are aimed at the same host, but which have not
2638 been passed in this run of the transport. In this case, continue_more will be
2639 true, and all we should do is send RSET if necessary, and return, leaving the
2642 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2643 do not want to continue with other messages down the same channel, because that
2644 can lead to looping between two or more messages, all with the same,
2645 temporarily failing address(es). [The retry information isn't updated yet, so
2646 new processes keep on trying.] We probably also don't want to try more of this
2647 message's addresses either.
2649 If we have started a TLS session, we have to end it before passing the
2650 connection to a new process. However, not all servers can handle this (Exim
2651 can), so we do not pass such a connection on if the host matches
2652 hosts_nopass_tls. */
2655 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2656 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2657 continue_more, yield, (first_addr == NULL)? "":"not ");
2659 if (completed_address && ok && send_quit)
2662 smtp_compare_t t_compare;
2664 t_compare.tblock = tblock;
2665 t_compare.current_sender_address = sender_address;
2667 if ( first_addr != NULL
2669 || ( ( tls_out.active < 0
2670 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2673 transport_check_waiting(tblock->name, host->name,
2674 tblock->connection_max_messages, new_message_id, &more,
2675 (oicf)smtp_are_same_identities, (void*)&t_compare)
2683 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2685 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2686 host->address, strerror(save_errno));
2689 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2690 ob->command_timeout)))
2693 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2697 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2698 host->name, host->address, msg);
2703 /* Either RSET was not needed, or it succeeded */
2707 if (first_addr != NULL) /* More addresses still to be sent */
2708 { /* in this run of the transport */
2709 continue_sequence++; /* Causes * in logging */
2712 if (continue_more) return yield; /* More addresses for another run */
2714 /* Pass the socket to a new Exim process. Before doing so, we must shut
2715 down TLS. Not all MTAs allow for the continuation of the SMTP session
2716 when TLS is shut down. We test for this by sending a new EHLO. If we
2717 don't get a good response, we don't attempt to pass the socket on. */
2720 if (tls_out.active >= 0)
2722 tls_close(FALSE, TRUE);
2726 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2727 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2728 ob->command_timeout);
2732 /* If the socket is successfully passed, we musn't send QUIT (or
2733 indeed anything!) from here. */
2735 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2736 new_message_id, inblock.sock))
2742 /* If RSET failed and there are addresses left, they get deferred. */
2744 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2748 /* End off tidily with QUIT unless the connection has died or the socket has
2749 been passed to another process. There has been discussion on the net about what
2750 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2751 to wait for a response, but on the other hand, there isn't anything one can do
2752 with an error response, other than log it. Exim used to do that. However,
2753 further discussion suggested that it is positively advantageous not to wait for
2754 the response, but to close the session immediately. This is supposed to move
2755 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2756 load from the server. (Hosts that are both servers and clients may not see much
2757 difference, of course.) Further discussion indicated that this was safe to do
2758 on Unix systems which have decent implementations of TCP/IP that leave the
2759 connection around for a while (TIME_WAIT) after the application has gone away.
2760 This enables the response sent by the server to be properly ACKed rather than
2761 timed out, as can happen on broken TCP/IP implementations on other OS.
2763 This change is being made on 31-Jul-98. After over a year of trouble-free
2764 operation, the old commented-out code was removed on 17-Sep-99. */
2767 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2772 tls_close(FALSE, TRUE);
2775 /* Close the socket, and return the appropriate value, first setting
2776 works because the NULL setting is passed back to the calling process, and
2777 remote_max_parallel is forced to 1 when delivering over an existing connection,
2779 If all went well and continue_more is set, we shouldn't actually get here if
2780 there are further addresses, as the return above will be taken. However,
2781 writing RSET might have failed, or there may be other addresses whose hosts are
2782 specified in the transports, and therefore not visible at top level, in which
2783 case continue_more won't get set. */
2785 (void)close(inblock.sock);
2787 #ifdef EXPERIMENTAL_EVENT
2788 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2791 continue_transport = NULL;
2792 continue_hostname = NULL;
2799 /*************************************************
2800 * Closedown entry point *
2801 *************************************************/
2803 /* This function is called when exim is passed an open smtp channel
2804 from another incarnation, but the message which it has been asked
2805 to deliver no longer exists. The channel is on stdin.
2807 We might do fancy things like looking for another message to send down
2808 the channel, but if the one we sought has gone, it has probably been
2809 delivered by some other process that itself will seek further messages,
2810 so just close down our connection.
2812 Argument: pointer to the transport instance block
2817 smtp_transport_closedown(transport_instance *tblock)
2819 smtp_transport_options_block *ob =
2820 (smtp_transport_options_block *)(tblock->options_block);
2821 smtp_inblock inblock;
2822 smtp_outblock outblock;
2824 uschar inbuffer[4096];
2825 uschar outbuffer[16];
2827 inblock.sock = fileno(stdin);
2828 inblock.buffer = inbuffer;
2829 inblock.buffersize = sizeof(inbuffer);
2830 inblock.ptr = inbuffer;
2831 inblock.ptrend = inbuffer;
2833 outblock.sock = inblock.sock;
2834 outblock.buffersize = sizeof(outbuffer);
2835 outblock.buffer = outbuffer;
2836 outblock.ptr = outbuffer;
2837 outblock.cmd_count = 0;
2838 outblock.authenticating = FALSE;
2840 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2841 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2842 ob->command_timeout);
2843 (void)close(inblock.sock);
2848 /*************************************************
2849 * Prepare addresses for delivery *
2850 *************************************************/
2852 /* This function is called to flush out error settings from previous delivery
2853 attempts to other hosts. It also records whether we got here via an MX record
2854 or not in the more_errno field of the address. We are interested only in
2855 addresses that are still marked DEFER - others may have got delivered to a
2856 previously considered IP address. Set their status to PENDING_DEFER to indicate
2857 which ones are relevant this time.
2860 addrlist the list of addresses
2861 host the host we are delivering to
2863 Returns: the first address for this delivery
2866 static address_item *
2867 prepare_addresses(address_item *addrlist, host_item *host)
2869 address_item *first_addr = NULL;
2871 for (addr = addrlist; addr != NULL; addr = addr->next)
2872 if (addr->transport_return == DEFER)
2874 if (first_addr == NULL) first_addr = addr;
2875 addr->transport_return = PENDING_DEFER;
2876 addr->basic_errno = 0;
2877 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2878 addr->message = NULL;
2880 addr->cipher = NULL;
2881 addr->ourcert = NULL;
2882 addr->peercert = NULL;
2883 addr->peerdn = NULL;
2884 addr->ocsp = OCSP_NOT_REQ;
2892 /*************************************************
2893 * Main entry point *
2894 *************************************************/
2896 /* See local README for interface details. As this is a remote transport, it is
2897 given a chain of addresses to be delivered in one connection, if possible. It
2898 always returns TRUE, indicating that each address has its own independent
2899 status set, except if there is a setting up problem, in which case it returns
2903 smtp_transport_entry(
2904 transport_instance *tblock, /* data for this instantiation */
2905 address_item *addrlist) /* addresses we are working on */
2909 int hosts_defer = 0;
2911 int hosts_looked_up = 0;
2912 int hosts_retry = 0;
2913 int hosts_serial = 0;
2914 int hosts_total = 0;
2915 int total_hosts_tried = 0;
2917 BOOL expired = TRUE;
2918 BOOL continuing = continue_hostname != NULL;
2919 uschar *expanded_hosts = NULL;
2921 uschar *tid = string_sprintf("%s transport", tblock->name);
2922 smtp_transport_options_block *ob =
2923 (smtp_transport_options_block *)(tblock->options_block);
2924 host_item *hostlist = addrlist->host_list;
2925 host_item *host = NULL;
2929 debug_printf("%s transport entered\n", tblock->name);
2930 for (addr = addrlist; addr != NULL; addr = addr->next)
2931 debug_printf(" %s\n", addr->address);
2932 if (continuing) debug_printf("already connected to %s [%s]\n",
2933 continue_hostname, continue_host_address);
2936 /* Set the flag requesting that these hosts be added to the waiting
2937 database if the delivery fails temporarily or if we are running with
2938 queue_smtp or a 2-stage queue run. This gets unset for certain
2939 kinds of error, typically those that are specific to the message. */
2941 update_waiting = TRUE;
2943 /* If a host list is not defined for the addresses - they must all have the
2944 same one in order to be passed to a single transport - or if the transport has
2945 a host list with hosts_override set, use the host list supplied with the
2946 transport. It is an error for this not to exist. */
2948 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2950 if (ob->hosts == NULL)
2952 addrlist->message = string_sprintf("%s transport called with no hosts set",
2954 addrlist->transport_return = PANIC;
2955 return FALSE; /* Only top address has status */
2958 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2961 /* If the transport's host list contains no '$' characters, and we are not
2962 randomizing, it is fixed and therefore a chain of hosts can be built once
2963 and for all, and remembered for subsequent use by other calls to this
2964 transport. If, on the other hand, the host list does contain '$', or we are
2965 randomizing its order, we have to rebuild it each time. In the fixed case,
2966 as the hosts string will never be used again, it doesn't matter that we
2967 replace all the : characters with zeros. */
2969 if (ob->hostlist == NULL)
2971 uschar *s = ob->hosts;
2973 if (Ustrchr(s, '$') != NULL)
2975 if (!(expanded_hosts = expand_string(s)))
2977 addrlist->message = string_sprintf("failed to expand list of hosts "
2978 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2979 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2980 return FALSE; /* Only top address has status */
2982 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2983 "\"%s\"\n", s, expanded_hosts);
2987 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2989 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2991 /* Check that the expansion yielded something useful. */
2992 if (hostlist == NULL)
2995 string_sprintf("%s transport has empty hosts setting", tblock->name);
2996 addrlist->transport_return = PANIC;
2997 return FALSE; /* Only top address has status */
3000 /* If there was no expansion of hosts, save the host list for
3003 if (!expanded_hosts) ob->hostlist = hostlist;
3006 /* This is not the first time this transport has been run in this delivery;
3007 the host list was built previously. */
3010 hostlist = ob->hostlist;
3013 /* The host list was supplied with the address. If hosts_randomize is set, we
3014 must sort it into a random order if it did not come from MX records and has not
3015 already been randomized (but don't bother if continuing down an existing
3018 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3020 host_item *newlist = NULL;
3021 while (hostlist != NULL)
3023 host_item *h = hostlist;
3024 hostlist = hostlist->next;
3026 h->sort_key = random_number(100);
3028 if (newlist == NULL)
3033 else if (h->sort_key < newlist->sort_key)
3040 host_item *hh = newlist;
3041 while (hh->next != NULL)
3043 if (h->sort_key < hh->next->sort_key) break;
3051 hostlist = addrlist->host_list = newlist;
3054 /* Sort out the default port. */
3056 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3058 /* For each host-plus-IP-address on the list:
3060 . If this is a continued delivery and the host isn't the one with the
3061 current connection, skip.
3063 . If the status is unusable (i.e. previously failed or retry checked), skip.
3065 . If no IP address set, get the address, either by turning the name into
3066 an address, calling gethostbyname if gethostbyname is on, or by calling
3067 the DNS. The DNS may yield multiple addresses, in which case insert the
3068 extra ones into the list.
3070 . Get the retry data if not previously obtained for this address and set the
3071 field which remembers the state of this address. Skip if the retry time is
3072 not reached. If not, remember whether retry data was found. The retry string
3073 contains both the name and the IP address.
3075 . Scan the list of addresses and mark those whose status is DEFER as
3076 PENDING_DEFER. These are the only ones that will be processed in this cycle
3079 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3080 Some addresses may be successfully delivered, others may fail, and yet
3081 others may get temporary errors and so get marked DEFER.
3083 . The return from the delivery attempt is OK if a connection was made and a
3084 valid SMTP dialogue was completed. Otherwise it is DEFER.
3086 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3088 . If fail to connect, or other defer state, add a retry item.
3090 . If there are any addresses whose status is still DEFER, carry on to the
3091 next host/IPaddress, unless we have tried the number of hosts given
3092 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3093 there is some fancy logic for hosts_max_try that means its limit can be
3094 overstepped in some circumstances.
3096 If we get to the end of the list, all hosts have deferred at least one address,
3097 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3098 delivery attempt to those hosts whose last try was before the arrival time of
3099 the current message. To cope with this, we have to go round the loop a second
3100 time. After that, set the status and error data for any addresses that haven't
3101 had it set already. */
3103 for (cutoff_retry = 0; expired &&
3104 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3107 host_item *nexthost = NULL;
3108 int unexpired_hosts_tried = 0;
3110 for (host = hostlist;
3112 unexpired_hosts_tried < ob->hosts_max_try &&
3113 total_hosts_tried < ob->hosts_max_try_hardlimit;
3119 BOOL serialized = FALSE;
3120 BOOL host_is_expired = FALSE;
3121 BOOL message_defer = FALSE;
3122 BOOL ifchanges = FALSE;
3123 BOOL some_deferred = FALSE;
3124 address_item *first_addr = NULL;
3125 uschar *interface = NULL;
3126 uschar *retry_host_key = NULL;
3127 uschar *retry_message_key = NULL;
3128 uschar *serialize_key = NULL;
3130 /* Default next host is next host. :-) But this can vary if the
3131 hosts_max_try limit is hit (see below). It may also be reset if a host
3132 address is looked up here (in case the host was multihomed). */
3134 nexthost = host->next;
3136 /* If the address hasn't yet been obtained from the host name, look it up
3137 now, unless the host is already marked as unusable. If it is marked as
3138 unusable, it means that the router was unable to find its IP address (in
3139 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3140 the lookup failed last time. We don't get this far if *all* MX records
3141 point to non-existent hosts; that is treated as a hard error.
3143 We can just skip this host entirely. When the hosts came from the router,
3144 the address will timeout based on the other host(s); when the address is
3145 looked up below, there is an explicit retry record added.
3147 Note that we mustn't skip unusable hosts if the address is not unset; they
3148 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3150 if (host->address == NULL)
3152 int new_port, flags;
3155 if (host->status >= hstatus_unusable)
3157 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3162 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3164 /* The host name is permitted to have an attached port. Find it, and
3165 strip it from the name. Just remember it for now. */
3167 new_port = host_item_get_port(host);
3169 /* Count hosts looked up */
3173 /* Find by name if so configured, or if it's an IP address. We don't
3174 just copy the IP address, because we need the test-for-local to happen. */
3176 flags = HOST_FIND_BY_A;
3177 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3178 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3180 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3181 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3183 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3184 ob->dnssec_request_domains, ob->dnssec_require_domains,
3187 /* Update the host (and any additional blocks, resulting from
3188 multihoming) with a host-specific port, if any. */
3190 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3192 /* Failure to find the host at this time (usually DNS temporary failure)
3193 is really a kind of routing failure rather than a transport failure.
3194 Therefore we add a retry item of the routing kind, not to stop us trying
3195 to look this name up here again, but to ensure the address gets timed
3196 out if the failures go on long enough. A complete failure at this point
3197 commonly points to a configuration error, but the best action is still
3198 to carry on for the next host. */
3200 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3202 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3204 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3205 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3206 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3207 host->status = hstatus_unusable;
3209 for (addr = addrlist; addr != NULL; addr = addr->next)
3211 if (addr->transport_return != DEFER) continue;
3212 addr->basic_errno = ERRNO_UNKNOWNHOST;
3214 string_sprintf("failed to lookup IP address for %s", host->name);
3219 /* If the host is actually the local host, we may have a problem, or
3220 there may be some cunning configuration going on. In the problem case,
3221 log things and give up. The default transport status is already DEFER. */
3223 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3225 for (addr = addrlist; addr != NULL; addr = addr->next)
3227 addr->basic_errno = 0;
3228 addr->message = string_sprintf("%s transport found host %s to be "
3229 "local", tblock->name, host->name);
3233 } /* End of block for IP address lookup */
3235 /* If this is a continued delivery, we are interested only in the host
3236 which matches the name of the existing open channel. The check is put
3237 here after the local host lookup, in case the name gets expanded as a
3238 result of the lookup. Set expired FALSE, to save the outer loop executing
3241 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3242 Ustrcmp(continue_host_address, host->address) != 0))
3245 continue; /* With next host */
3248 /* Reset the default next host in case a multihomed host whose addresses
3249 are not looked up till just above added to the host list. */
3251 nexthost = host->next;
3253 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3254 domain is in queue_smtp_domains, we don't actually want to attempt any
3255 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3256 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3257 were not in it. We don't want to hold up all SMTP deliveries! Except when
3258 doing a two-stage queue run, don't do this if forcing. */
3260 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3261 match_isinlist(addrlist->domain,
3262 (const uschar **)&queue_smtp_domains, 0,
3263 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3266 for (addr = addrlist; addr != NULL; addr = addr->next)
3268 if (addr->transport_return != DEFER) continue;
3269 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3271 continue; /* With next host */
3274 /* Count hosts being considered - purely for an intelligent comment
3275 if none are usable. */
3279 /* Set $host and $host address now in case they are needed for the
3280 interface expansion or the serialize_hosts check; they remain set if an
3281 actual delivery happens. */
3283 deliver_host = host->name;
3284 deliver_host_address = host->address;
3285 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3286 : host->dnssec == DS_NO ? US"no"
3289 /* Set up a string for adding to the retry key if the port number is not
3290 the standard SMTP port. A host may have its own port setting that overrides
3293 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3295 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3297 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3298 string changes upon expansion, we must add it to the key that is used for
3299 retries, because connections to the same host from a different interface
3300 should be treated separately. */
3302 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3303 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3306 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3308 /* The first time round the outer loop, check the status of the host by
3309 inspecting the retry data. The second time round, we are interested only
3310 in expired hosts that haven't been tried since this message arrived. */
3312 if (cutoff_retry == 0)
3315 /* Ensure the status of the address is set by checking retry data if
3316 necessary. There may be host-specific retry data (applicable to all
3317 messages) and also data for retries of a specific message at this host.
3318 If either of these retry records are actually read, the keys used are
3319 returned to save recomputing them later. */
3321 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3322 US"retry_include_ip_address", ob->retry_include_ip_address,
3323 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3324 continue; /* with next host */
3326 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3327 incl_ip, &retry_host_key, &retry_message_key);
3329 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3330 (host->address == NULL)? US"" : host->address, pistring,
3331 (host->status == hstatus_usable)? "usable" :
3332 (host->status == hstatus_unusable)? "unusable" :
3333 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3335 /* Skip this address if not usable at this time, noting if it wasn't
3336 actually expired, both locally and in the address. */
3338 switch (host->status)
3340 case hstatus_unusable:
3342 setflag(addrlist, af_retry_skipped);
3345 case hstatus_unusable_expired:
3348 case hwhy_retry: hosts_retry++; break;
3349 case hwhy_failed: hosts_fail++; break;
3350 case hwhy_deferred: hosts_defer++; break;
3353 /* If there was a retry message key, implying that previously there
3354 was a message-specific defer, we don't want to update the list of
3355 messages waiting for these hosts. */
3357 if (retry_message_key != NULL) update_waiting = FALSE;
3358 continue; /* With the next host or IP address */
3362 /* Second time round the loop: if the address is set but expired, and
3363 the message is newer than the last try, let it through. */
3367 if (host->address == NULL ||
3368 host->status != hstatus_unusable_expired ||
3369 host->last_try > received_time)
3372 debug_printf("trying expired host %s [%s]%s\n",
3373 host->name, host->address, pistring);
3374 host_is_expired = TRUE;
3377 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3378 it remains TRUE only if all hosts are expired and none are actually tried.
3383 /* If this host is listed as one to which access must be serialized,
3384 see if another Exim process has a connection to it, and if so, skip
3385 this host. If not, update the database to record our connection to it
3386 and remember this for later deletion. Do not do any of this if we are
3387 sending the message down a pre-existing connection. */
3390 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3392 serialize_key = string_sprintf("host-serialize-%s", host->name);
3393 if (!enq_start(serialize_key))
3396 debug_printf("skipping host %s because another Exim process "
3397 "is connected to it\n", host->name);
3404 /* OK, we have an IP address that is not waiting for its retry time to
3405 arrive (it might be expired) OR (second time round the loop) we have an
3406 expired host that hasn't been tried since the message arrived. Have a go
3407 at delivering the message to it. First prepare the addresses by flushing
3408 out the result of previous attempts, and finding the first address that
3409 is still to be delivered. */
3411 first_addr = prepare_addresses(addrlist, host);
3413 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3414 message_id, host->name, host->address, addrlist->address,
3415 (addrlist->next == NULL)? "" : ", ...");
3417 set_process_info("delivering %s to %s [%s] (%s%s)",
3418 message_id, host->name, host->address, addrlist->address,
3419 (addrlist->next == NULL)? "" : ", ...");
3421 /* This is not for real; don't do the delivery. If there are
3422 any remaining hosts, list them. */
3427 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3428 for (addr = addrlist; addr != NULL; addr = addr->next)
3430 addr->host_used = host;
3431 addr->special_action = '*';
3432 addr->message = US"delivery bypassed by -N option";
3436 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3437 "*** host and remaining hosts:\n", tblock->name);
3438 for (host2 = host; host2 != NULL; host2 = host2->next)
3439 debug_printf(" %s [%s]\n", host2->name,
3440 (host2->address == NULL)? US"unset" : host2->address);
3445 /* This is for real. If the host is expired, we don't count it for
3446 hosts_max_retry. This ensures that all hosts must expire before an address
3447 is timed out, unless hosts_max_try_hardlimit (which protects against
3448 lunatic DNS configurations) is reached.
3450 If the host is not expired and we are about to hit the hosts_max_retry
3451 limit, check to see if there is a subsequent hosts with a different MX
3452 value. If so, make that the next host, and don't count this one. This is a
3453 heuristic to make sure that different MXs do get tried. With a normal kind
3454 of retry rule, they would get tried anyway when the earlier hosts were
3455 delayed, but if the domain has a "retry every time" type of rule - as is
3456 often used for the the very large ISPs, that won't happen. */
3461 /* Make a copy of the host if it is local to this invocation
3462 of the transport. */
3466 thost = store_get(sizeof(host_item));
3468 thost->name = string_copy(host->name);
3469 thost->address = string_copy(host->address);
3474 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3478 debug_printf("hosts_max_try limit reached with this host\n");
3479 for (h = host; h != NULL; h = h->next)
3480 if (h->mx != host->mx) break;
3484 unexpired_hosts_tried--;
3485 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3486 "and will be tried\n");
3490 /* Attempt the delivery. */
3492 total_hosts_tried++;
3493 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3494 &message_defer, FALSE);
3497 OK => connection made, each address contains its result;
3498 message_defer is set for message-specific defers (when all
3499 recipients are marked defer)
3500 DEFER => there was a non-message-specific delivery problem;
3501 ERROR => there was a problem setting up the arguments for a filter,
3502 or there was a problem with expanding added headers
3505 /* If the result is not OK, there was a non-message-specific problem.
3506 If the result is DEFER, we need to write to the logs saying what happened
3507 for this particular host, except in the case of authentication and TLS
3508 failures, where the log has already been written. If all hosts defer a
3509 general message is written at the end. */
3511 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3512 first_addr->basic_errno != ERRNO_TLSFAILURE)
3513 write_logs(first_addr, host);
3515 #ifdef EXPERIMENTAL_EVENT
3517 deferred_event_raise(first_addr, host);
3520 /* If STARTTLS was accepted, but there was a failure in setting up the
3521 TLS session (usually a certificate screwup), and the host is not in
3522 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3523 TLS forcibly turned off. We have to start from scratch with a new SMTP
3524 connection. That's why the retry is done from here, not from within
3525 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3526 session, so the in-clear transmission after those errors, if permitted,
3527 happens inside smtp_deliver().] */
3531 && first_addr->basic_errno == ERRNO_TLSFAILURE
3532 && ob->tls_tempfail_tryclear
3533 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3536 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3537 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3538 first_addr = prepare_addresses(addrlist, host);
3539 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3540 &message_defer, TRUE);
3541 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3542 write_logs(first_addr, host);
3543 # ifdef EXPERIMENTAL_EVENT
3545 deferred_event_raise(first_addr, host);
3548 #endif /*SUPPORT_TLS*/
3551 /* Delivery attempt finished */
3553 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3556 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3557 message_id, host->name, host->address, addrlist->address,
3558 (addrlist->next == NULL)? "" : " (& others)", rs);
3560 /* Release serialization if set up */
3562 if (serialized) enq_end(serialize_key);
3564 /* If the result is DEFER, or if a host retry record is known to exist, we
3565 need to add an item to the retry chain for updating the retry database
3566 at the end of delivery. We only need to add the item to the top address,
3567 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3568 for any other delivery attempts using the same address. (It is copied into
3569 the unusable tree at the outer level, so even if different address blocks
3570 contain the same address, it still won't get tried again.) */
3572 if (rc == DEFER || retry_host_key != NULL)
3574 int delete_flag = (rc != DEFER)? rf_delete : 0;
3575 if (retry_host_key == NULL)
3578 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3579 US"retry_include_ip_address", ob->retry_include_ip_address,
3580 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3581 incl_ip = TRUE; /* error; use most-specific retry record */
3583 retry_host_key = incl_ip ?
3584 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3585 string_sprintf("T:%S%s", host->name, pistring);
3588 /* If a delivery of another message over an existing SMTP connection
3589 yields DEFER, we do NOT set up retry data for the host. This covers the
3590 case when there are delays in routing the addresses in the second message
3591 that are so long that the server times out. This is alleviated by not
3592 routing addresses that previously had routing defers when handling an
3593 existing connection, but even so, this case may occur (e.g. if a
3594 previously happily routed address starts giving routing defers). If the
3595 host is genuinely down, another non-continued message delivery will
3596 notice it soon enough. */
3598 if (delete_flag != 0 || !continuing)
3599 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3601 /* We may have tried an expired host, if its retry time has come; ensure
3602 the status reflects the expiry for the benefit of any other addresses. */
3606 host->status = (host_is_expired)?
3607 hstatus_unusable_expired : hstatus_unusable;
3608 host->why = hwhy_deferred;
3612 /* If message_defer is set (host was OK, but every recipient got deferred
3613 because of some message-specific problem), or if that had happened
3614 previously so that a message retry key exists, add an appropriate item
3615 to the retry chain. Note that if there was a message defer but now there is
3616 a host defer, the message defer record gets deleted. That seems perfectly
3617 reasonable. Also, stop the message from being remembered as waiting
3618 for specific hosts. */
3620 if (message_defer || retry_message_key != NULL)
3622 int delete_flag = message_defer? 0 : rf_delete;
3623 if (retry_message_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_message_key = incl_ip ?
3632 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3634 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3636 retry_add_item(addrlist, retry_message_key,
3637 rf_message | rf_host | delete_flag);
3638 update_waiting = FALSE;
3641 /* Any return other than DEFER (that is, OK or ERROR) means that the
3642 addresses have got their final statuses filled in for this host. In the OK
3643 case, see if any of them are deferred. */
3647 for (addr = addrlist; addr != NULL; addr = addr->next)
3649 if (addr->transport_return == DEFER)
3651 some_deferred = TRUE;
3657 /* If no addresses deferred or the result was ERROR, return. We do this for
3658 ERROR because a failing filter set-up or add_headers expansion is likely to
3659 fail for any host we try. */
3661 if (rc == ERROR || (rc == OK && !some_deferred))
3663 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3664 return TRUE; /* Each address has its status */
3667 /* If the result was DEFER or some individual addresses deferred, let
3668 the loop run to try other hosts with the deferred addresses, except for the
3669 case when we were trying to deliver down an existing channel and failed.
3670 Don't try any other hosts in this case. */
3672 if (continuing) break;
3674 /* If the whole delivery, or some individual addresses, were deferred and
3675 there are more hosts that could be tried, do not count this host towards
3676 the hosts_max_try limit if the age of the message is greater than the
3677 maximum retry time for this host. This means we may try try all hosts,
3678 ignoring the limit, when messages have been around for some time. This is
3679 important because if we don't try all hosts, the address will never time
3680 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3682 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3685 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3687 if (retry != NULL && retry->rules != NULL)
3689 retry_rule *last_rule;
3690 for (last_rule = retry->rules;
3691 last_rule->next != NULL;
3692 last_rule = last_rule->next);
3693 timedout = time(NULL) - received_time > last_rule->timeout;
3695 else timedout = TRUE; /* No rule => timed out */
3699 unexpired_hosts_tried--;
3700 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3701 "hosts_max_try (message older than host's retry time)\n");
3704 } /* End of loop for trying multiple hosts. */
3706 /* This is the end of the loop that repeats iff expired is TRUE and
3707 ob->delay_after_cutoff is FALSE. The second time round we will
3708 try those hosts that haven't been tried since the message arrived. */
3712 debug_printf("all IP addresses skipped or deferred at least one address\n");
3713 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3714 debug_printf("retrying IP addresses not tried since message arrived\n");
3719 /* Get here if all IP addresses are skipped or defer at least one address. In
3720 MUA wrapper mode, this will happen only for connection or other non-message-
3721 specific failures. Force the delivery status for all addresses to FAIL. */
3725 for (addr = addrlist; addr != NULL; addr = addr->next)
3726 addr->transport_return = FAIL;
3730 /* In the normal, non-wrapper case, add a standard message to each deferred
3731 address if there hasn't been an error, that is, if it hasn't actually been
3732 tried this time. The variable "expired" will be FALSE if any deliveries were
3733 actually tried, or if there was at least one host that was not expired. That
3734 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3735 a delivery has been tried, an error code will be set, and the failing of the
3736 message is handled by the retry code later.
3738 If queue_smtp is set, or this transport was called to send a subsequent message
3739 down an existing TCP/IP connection, and something caused the host not to be
3740 found, we end up here, but can detect these cases and handle them specially. */
3742 for (addr = addrlist; addr != NULL; addr = addr->next)
3744 /* If host is not NULL, it means that we stopped processing the host list
3745 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3746 means we need to behave as if some hosts were skipped because their retry
3747 time had not come. Specifically, this prevents the address from timing out.
3748 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3749 hosts were tried. */
3753 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3756 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3757 "hosts were tried\n");
3762 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3763 setflag(addr, af_retry_skipped);
3767 if (queue_smtp) /* no deliveries attempted */
3769 addr->transport_return = DEFER;
3770 addr->basic_errno = 0;
3771 addr->message = US"SMTP delivery explicitly queued";
3774 else if (addr->transport_return == DEFER &&
3775 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3776 addr->message == NULL)
3778 addr->basic_errno = ERRNO_HRETRY;
3779 if (continue_hostname != NULL)
3781 addr->message = US"no host found for existing SMTP connection";
3785 setflag(addr, af_pass_message); /* This is not a security risk */
3786 addr->message = (ob->delay_after_cutoff)?
3787 US"retry time not reached for any host after a long failure period" :
3788 US"all hosts have been failing for a long time and were last tried "
3789 "after this message arrived";
3791 /* If we are already using fallback hosts, or there are no fallback hosts
3792 defined, convert the result to FAIL to cause a bounce. */
3794 if (addr->host_list == addr->fallback_hosts ||
3795 addr->fallback_hosts == NULL)
3796 addr->transport_return = FAIL;
3800 if (hosts_retry == hosts_total)
3801 addr->message = US"retry time not reached for any host";
3802 else if (hosts_fail == hosts_total)
3803 addr->message = US"all host address lookups failed permanently";
3804 else if (hosts_defer == hosts_total)
3805 addr->message = US"all host address lookups failed temporarily";
3806 else if (hosts_serial == hosts_total)
3807 addr->message = US"connection limit reached for all hosts";
3808 else if (hosts_fail+hosts_defer == hosts_total)
3809 addr->message = US"all host address lookups failed";
3810 else addr->message = US"some host address lookups failed and retry time "
3811 "not reached for other hosts or connection limit reached";
3816 /* Update the database which keeps information about which messages are waiting
3817 for which hosts to become available. For some message-specific errors, the
3818 update_waiting flag is turned off because we don't want follow-on deliveries in
3819 those cases. If this transport instance is explicitly limited to one message
3820 per connection then follow-on deliveries are not possible and there's no need
3821 to create/update the per-transport wait-<transport_name> database. */
3823 if (update_waiting && tblock->connection_max_messages != 1)
3824 transport_update_waiting(hostlist, tblock->name);
3828 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3830 return TRUE; /* Each address has its status */
3835 /* End of transport/smtp.c */