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) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 NULL, /* 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 */
1205 if (!dns_is_secure(dnsa))
1207 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1219 typedef struct smtp_compare_s
1221 uschar *current_sender_address;
1222 struct transport_instance *tblock;
1226 Create a unique string that identifies this message, it is based on
1227 sender_address, helo_data and tls_certificate if enabled. */
1230 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1232 address_item * addr1;
1233 uschar * if1 = US"";
1234 uschar * helo1 = US"";
1236 uschar * tlsc1 = US"";
1238 uschar * save_sender_address = sender_address;
1239 uschar * local_identity = NULL;
1240 smtp_transport_options_block * ob =
1241 (smtp_transport_options_block *)tblock->options_block;
1243 sender_address = sender;
1245 addr1 = deliver_make_addr (sender, TRUE);
1246 deliver_set_expansions(addr1);
1249 if1 = expand_string(ob->interface);
1252 helo1 = expand_string(ob->helo_data);
1255 if (ob->tls_certificate)
1256 tlsc1 = expand_string(ob->tls_certificate);
1257 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1259 local_identity = string_sprintf ("%s^%s", if1, helo1);
1262 deliver_set_expansions(NULL);
1263 sender_address = save_sender_address;
1265 return local_identity;
1270 /* This routine is a callback that is called from transport_check_waiting.
1271 This function will evaluate the incoming message versus the previous
1272 message. If the incoming message is using a different local identity then
1273 we will veto this new message. */
1276 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1278 uschar * save_sender_address = sender_address;
1279 uschar * current_local_identity =
1280 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1281 uschar * new_sender_address = deliver_get_sender_address(message_id);
1282 uschar * message_local_identity =
1283 smtp_local_identity(new_sender_address, s_compare->tblock);
1285 sender_address = save_sender_address;
1287 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1292 /*************************************************
1293 * Deliver address list to given host *
1294 *************************************************/
1296 /* If continue_hostname is not null, we get here only when continuing to
1297 deliver down an existing channel. The channel was passed as the standard
1298 input. TLS is never active on a passed channel; the previous process always
1299 closes it down before passing the connection on.
1301 Otherwise, we have to make a connection to the remote host, and do the
1302 initial protocol exchange.
1304 When running as an MUA wrapper, if the sender or any recipient is rejected,
1305 temporarily or permanently, we force failure for all recipients.
1308 addrlist chain of potential addresses to deliver; only those whose
1309 transport_return field is set to PENDING_DEFER are currently
1310 being processed; others should be skipped - they have either
1311 been delivered to an earlier host or IP address, or been
1312 failed by one of them.
1313 host host to deliver to
1314 host_af AF_INET or AF_INET6
1315 port default TCP/IP port to use, in host byte order
1316 interface interface to bind to, or NULL
1317 tblock transport instance block
1318 message_defer set TRUE if yield is OK, but all addresses were deferred
1319 because of a non-recipient, non-host failure, that is, a
1320 4xx response to MAIL FROM, DATA, or ".". This is a defer
1321 that is specific to the message.
1322 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1323 a second attempt after TLS initialization fails
1325 Returns: OK - the connection was made and the delivery attempted;
1326 the result for each address is in its data block.
1327 DEFER - the connection could not be made, or something failed
1328 while setting up the SMTP session, or there was a
1329 non-message-specific error, such as a timeout.
1330 ERROR - a filter command is specified for this transport,
1331 and there was a problem setting it up; OR helo_data
1332 or add_headers or authenticated_sender is specified
1333 for this transport, and the string failed to expand
1337 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1338 uschar *interface, transport_instance *tblock,
1339 BOOL *message_defer, BOOL suppress_tls)
1342 address_item *sync_addr;
1343 address_item *first_addr = addrlist;
1348 time_t start_delivery_time = time(NULL);
1349 smtp_transport_options_block *ob =
1350 (smtp_transport_options_block *)(tblock->options_block);
1351 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1352 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1354 BOOL send_rset = TRUE;
1355 BOOL send_quit = TRUE;
1356 BOOL setting_up = TRUE;
1357 BOOL completed_address = FALSE;
1360 BOOL pass_message = FALSE;
1361 #ifndef DISABLE_PRDR
1362 BOOL prdr_offered = FALSE;
1365 #ifdef EXPERIMENTAL_INTERNATIONAL
1366 BOOL utf8_needed = FALSE;
1367 BOOL utf8_offered = FALSE;
1369 BOOL dsn_all_lasthop = TRUE;
1370 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1373 dns_answer tlsa_dnsa;
1375 smtp_inblock inblock;
1376 smtp_outblock outblock;
1377 int max_rcpt = tblock->max_addresses;
1378 uschar *igquotstr = US"";
1380 uschar *helo_data = NULL;
1382 uschar *message = NULL;
1383 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1385 uschar buffer[4096];
1386 uschar inbuffer[4096];
1387 uschar outbuffer[4096];
1389 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1391 *message_defer = FALSE;
1392 smtp_command = US"initial connection";
1393 if (max_rcpt == 0) max_rcpt = 999999;
1395 /* Set up the buffer for reading SMTP response packets. */
1397 inblock.buffer = inbuffer;
1398 inblock.buffersize = sizeof(inbuffer);
1399 inblock.ptr = inbuffer;
1400 inblock.ptrend = inbuffer;
1402 /* Set up the buffer for holding SMTP commands while pipelining */
1404 outblock.buffer = outbuffer;
1405 outblock.buffersize = sizeof(outbuffer);
1406 outblock.ptr = outbuffer;
1407 outblock.cmd_count = 0;
1408 outblock.authenticating = FALSE;
1410 /* Reset the parameters of a TLS session. */
1413 tls_out.cipher = NULL; /* the one we may use for this transport */
1414 tls_out.ourcert = NULL;
1415 tls_out.peercert = NULL;
1416 tls_out.peerdn = NULL;
1417 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1420 tls_out.ocsp = OCSP_NOT_REQ;
1422 /* Flip the legacy TLS-related variables over to the outbound set in case
1423 they're used in the context of the transport. Don't bother resetting
1424 afterward as we're in a subprocess. */
1426 tls_modify_variables(&tls_out);
1431 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1432 DEFER, FALSE, NULL);
1437 /* Make a connection to the host if this isn't a continued delivery, and handle
1438 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1439 specially so they can be identified for retries. */
1441 if (continue_hostname == NULL)
1443 /* This puts port into host->port */
1444 inblock.sock = outblock.sock =
1445 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1447 if (inblock.sock < 0)
1449 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1450 NULL, DEFER, FALSE, NULL);
1454 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1456 tls_out.dane_verified = FALSE;
1457 tls_out.tlsa_usage = 0;
1459 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1461 if (host->dnssec == DS_YES)
1464 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1466 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1470 set_errno(addrlist, ERRNO_DNSDEFER,
1471 string_sprintf("DANE error: tlsa lookup %s",
1472 rc == DEFER ? "DEFER" : "FAIL"),
1477 else if (dane_required)
1479 set_errno(addrlist, ERRNO_DNSDEFER,
1480 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1486 ob->tls_tempfail_tryclear = FALSE;
1490 /* Expand the greeting message while waiting for the initial response. (Makes
1491 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1492 delayed till here so that $sending_interface and $sending_port are set. */
1494 helo_data = expand_string(ob->helo_data);
1495 #ifdef EXPERIMENTAL_INTERNATIONAL
1498 uschar * errstr = NULL;
1499 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1501 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1502 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1509 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1510 is nevertheless a reasonably clean way of programming this kind of logic,
1511 where you want to escape on any error. */
1515 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1516 ob->command_timeout)) goto RESPONSE_FAILED;
1518 #ifdef EXPERIMENTAL_EVENT
1521 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1522 : host->dnssec==DS_NO ? US"no" : NULL;
1523 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1526 set_errno(addrlist, ERRNO_EXPANDFAIL,
1527 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1528 DEFER, FALSE, NULL);
1535 /* Now check if the helo_data expansion went well, and sign off cleanly if
1538 if (helo_data == NULL)
1540 uschar *message = string_sprintf("failed to expand helo_data: %s",
1541 expand_string_message);
1542 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1548 /** Debugging without sending a message
1549 addrlist->transport_return = DEFER;
1553 /* Errors that occur after this point follow an SMTP command, which is
1554 left in big_buffer by smtp_write_command() for use in error messages. */
1556 smtp_command = big_buffer;
1558 /* Tell the remote who we are...
1560 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1561 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1562 greeting is of this form. The assumption was that the far end supports it
1563 properly... but experience shows that there are some that give 5xx responses,
1564 even though the banner includes "ESMTP" (there's a bloody-minded one that
1565 says "ESMTP not spoken here"). Cope with that case.
1567 September 2000: Time has passed, and it seems reasonable now to always send
1568 EHLO at the start. It is also convenient to make the change while installing
1571 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1572 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1573 would be no way to send out the mails, so there is now a host list
1574 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1575 PIPELINING problem as well. Maybe it can also be useful to cure other
1576 problems with broken servers.
1578 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1579 Then somebody tried it with a Microsoft mailer... It seems that all other
1580 mailers use upper case for some reason (the RFC is quite clear about case
1581 independence) so, for peace of mind, I gave in. */
1583 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1585 /* Alas; be careful, since this goto is not an error-out, so conceivably
1586 we might set data between here and the target which we assume to exist
1587 and be usable. I can see this coming back to bite us. */
1592 suppress_tls = FALSE;
1593 ob->tls_tempfail_tryclear = FALSE;
1594 smtp_command = US"SSL-on-connect";
1601 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1602 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1604 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1605 ob->command_timeout))
1607 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1614 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1619 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1621 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1622 ob->command_timeout)) goto RESPONSE_FAILED;
1625 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1626 lmtp_ignore_quota option was set. */
1628 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1629 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1630 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1632 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1635 tls_offered = esmtp &&
1636 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1637 PCRE_EOPT, NULL, 0) >= 0;
1640 #ifndef DISABLE_PRDR
1641 prdr_offered = esmtp
1642 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1643 PCRE_EOPT, NULL, 0) >= 0
1644 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1647 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1650 #ifdef EXPERIMENTAL_INTERNATIONAL
1651 if (addrlist->prop.utf8_msg)
1653 utf8_needed = !addrlist->prop.utf8_downcvt
1654 && !addrlist->prop.utf8_downcvt_maybe;
1655 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1656 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1658 utf8_offered = esmtp
1659 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1660 PCRE_EOPT, NULL, 0) >= 0;
1665 /* For continuing deliveries down the same channel, the socket is the standard
1666 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1667 below). Set up the pointer to where subsequent commands will be left, for
1668 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1669 set from the command line if they were set in the process that passed the
1674 inblock.sock = outblock.sock = fileno(stdin);
1675 smtp_command = big_buffer;
1676 host->port = port; /* Record the port that was used */
1679 /* If TLS is available on this connection, whether continued or not, attempt to
1680 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1681 send another EHLO - the server may give a different answer in secure mode. We
1682 use a separate buffer for reading the response to STARTTLS so that if it is
1683 negative, the original EHLO data is available for subsequent analysis, should
1684 the client not be required to use TLS. If the response is bad, copy the buffer
1685 for error analysis. */
1690 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1692 uschar buffer2[4096];
1693 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1696 /* If there is an I/O error, transmission of this message is deferred. If
1697 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1698 false, we also defer. However, if there is a temporary rejection of STARTTLS
1699 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1700 STARTTLS, we carry on. This means we will try to send the message in clear,
1701 unless the host is in hosts_require_tls (tested below). */
1703 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1704 ob->command_timeout))
1706 if (errno != 0 || buffer2[0] == 0 ||
1707 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1709 Ustrncpy(buffer, buffer2, sizeof(buffer));
1710 goto RESPONSE_FAILED;
1714 /* STARTTLS accepted: try to negotiate a TLS session. */
1719 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1720 # ifdef EXPERIMENTAL_DANE
1721 , dane ? &tlsa_dnsa : NULL
1725 /* TLS negotiation failed; give an error. From outside, this function may
1726 be called again to try in clear on a new connection, if the options permit
1727 it for this host. */
1731 # ifdef EXPERIMENTAL_DANE
1732 if (rc == DEFER && dane && !dane_required)
1734 log_write(0, LOG_MAIN, "DANE attempt failed;"
1735 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1736 host->name, host->address);
1742 save_errno = ERRNO_TLSFAILURE;
1743 message = US"failure while setting up TLS session";
1748 /* TLS session is set up */
1750 for (addr = addrlist; addr != NULL; addr = addr->next)
1751 if (addr->transport_return == PENDING_DEFER)
1753 addr->cipher = tls_out.cipher;
1754 addr->ourcert = tls_out.ourcert;
1755 addr->peercert = tls_out.peercert;
1756 addr->peerdn = tls_out.peerdn;
1757 addr->ocsp = tls_out.ocsp;
1762 /* if smtps, we'll have smtp_command set to something else; always safe to
1764 smtp_command = big_buffer;
1766 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1767 helo_data is null, we are dealing with a connection that was passed from
1768 another process, and so we won't have expanded helo_data above. We have to
1769 expand it here. $sending_ip_address and $sending_port are set up right at the
1770 start of the Exim process (in exim.c). */
1772 if (tls_out.active >= 0)
1775 if (helo_data == NULL)
1777 helo_data = expand_string(ob->helo_data);
1778 if (helo_data == NULL)
1780 uschar *message = string_sprintf("failed to expand helo_data: %s",
1781 expand_string_message);
1782 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1788 /* For SMTPS we need to wait for the initial OK response. */
1791 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1792 ob->command_timeout)) goto RESPONSE_FAILED;
1796 greeting_cmd = "EHLO";
1799 greeting_cmd = "HELO";
1801 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1804 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1805 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1807 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1808 ob->command_timeout))
1809 goto RESPONSE_FAILED;
1812 /* If the host is required to use a secure channel, ensure that we
1816 # ifdef EXPERIMENTAL_DANE
1819 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1822 save_errno = ERRNO_TLSREQUIRED;
1823 message = string_sprintf("a TLS session is required, but %s",
1824 tls_offered? "an attempt to start TLS failed" :
1825 "the server did not offer TLS support");
1828 #endif /*SUPPORT_TLS*/
1830 /* If TLS is active, we have just started it up and re-done the EHLO command,
1831 so its response needs to be analyzed. If TLS is not active and this is a
1832 continued session down a previously-used socket, we haven't just done EHLO, so
1835 if (continue_hostname == NULL
1837 || tls_out.active >= 0
1841 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1842 lmtp_ignore_quota option was set. */
1844 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1845 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1846 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1848 /* If the response to EHLO specified support for the SIZE parameter, note
1849 this, provided size_addition is non-negative. */
1851 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1852 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1853 PCRE_EOPT, NULL, 0) >= 0;
1855 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1856 the current host, esmtp will be false, so PIPELINING can never be used. If
1857 the current host matches hosts_avoid_pipelining, don't do it. */
1859 smtp_use_pipelining = esmtp
1860 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1861 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1862 PCRE_EOPT, NULL, 0) >= 0;
1864 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1865 smtp_use_pipelining? "" : "not ");
1867 #ifndef DISABLE_PRDR
1868 prdr_offered = esmtp
1869 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1870 PCRE_EOPT, NULL, 0) >= 0
1871 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1874 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1877 #ifdef EXPERIMENTAL_INTERNATIONAL
1878 if (addrlist->prop.utf8_msg)
1879 utf8_offered = esmtp
1880 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1881 PCRE_EOPT, NULL, 0) >= 0;
1884 /* Note if the server supports DSN */
1885 smtp_use_dsn = esmtp
1886 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1887 PCRE_EOPT, NULL, 0) >= 0;
1888 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1890 /* Note if the response to EHLO specifies support for the AUTH extension.
1891 If it has, check that this host is one we want to authenticate to, and do
1892 the business. The host name and address must be available when the
1893 authenticator's client driver is running. */
1895 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1896 ob, esmtp, &inblock, &outblock))
1898 default: goto SEND_QUIT;
1900 case FAIL_SEND: goto SEND_FAILED;
1901 case FAIL: goto RESPONSE_FAILED;
1905 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1906 message-specific. */
1910 #ifdef EXPERIMENTAL_INTERNATIONAL
1911 /* If this is an international message we need the host to speak SMTPUTF8 */
1912 if (utf8_needed && !utf8_offered)
1914 errno = ERRNO_UTF8_FWD;
1915 goto RESPONSE_FAILED;
1919 /* If there is a filter command specified for this transport, we can now
1920 set it up. This cannot be done until the identify of the host is known. */
1922 if (tblock->filter_command != NULL)
1926 sprintf(CS buffer, "%.50s transport", tblock->name);
1927 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1928 TRUE, DEFER, addrlist, buffer, NULL);
1929 transport_filter_timeout = tblock->filter_timeout;
1931 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1936 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1944 /* For messages that have more than the maximum number of envelope recipients,
1945 we want to send several transactions down the same SMTP connection. (See
1946 comments in deliver.c as to how this reconciles, heuristically, with
1947 remote_max_parallel.) This optimization was added to Exim after the following
1948 code was already working. The simplest way to put it in without disturbing the
1949 code was to use a goto to jump back to this point when there is another
1950 transaction to handle. */
1953 sync_addr = first_addr;
1957 completed_address = FALSE;
1960 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1961 qualification, send it, adding something to the message size to allow for
1962 imprecision and things that get added en route. Exim keeps the number of lines
1963 in a message, so we can give an accurate value for the original message, but we
1964 need some additional to handle added headers. (Double "." characters don't get
1965 included in the count.) */
1972 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1976 #ifndef DISABLE_PRDR
1977 prdr_active = FALSE;
1980 for (addr = first_addr; addr; addr = addr->next)
1981 if (addr->transport_return == PENDING_DEFER)
1983 for (addr = addr->next; addr; addr = addr->next)
1984 if (addr->transport_return == PENDING_DEFER)
1985 { /* at least two recipients to send */
1987 sprintf(CS p, " PRDR"); p += 5;
1995 #ifdef EXPERIMENTAL_INTERNATIONAL
1996 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1997 sprintf(CS p, " SMTPUTF8"), p += 9;
2000 /* check if all addresses have lasthop flag */
2001 /* do not send RET and ENVID if true */
2002 for (dsn_all_lasthop = TRUE, addr = first_addr;
2003 address_count < max_rcpt && addr != NULL;
2005 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2007 dsn_all_lasthop = FALSE;
2011 /* Add any DSN flags to the mail command */
2013 if (smtp_use_dsn && !dsn_all_lasthop)
2015 if (dsn_ret == dsn_ret_hdrs)
2017 Ustrcpy(p, " RET=HDRS");
2020 else if (dsn_ret == dsn_ret_full)
2022 Ustrcpy(p, " RET=FULL");
2025 if (dsn_envid != NULL)
2027 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2032 /* If an authenticated_sender override has been specified for this transport
2033 instance, expand it. If the expansion is forced to fail, and there was already
2034 an authenticated_sender for this message, the original value will be used.
2035 Other expansion failures are serious. An empty result is ignored, but there is
2036 otherwise no check - this feature is expected to be used with LMTP and other
2037 cases where non-standard addresses (e.g. without domains) might be required. */
2039 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2045 /* From here until we send the DATA command, we can make use of PIPELINING
2046 if the server host supports it. The code has to be able to check the responses
2047 at any point, for when the buffer fills up, so we write it totally generally.
2048 When PIPELINING is off, each command written reports that it has flushed the
2051 pending_MAIL = TRUE; /* The block starts with MAIL */
2054 uschar * s = return_path;
2055 #ifdef EXPERIMENTAL_INTERNATIONAL
2056 uschar * errstr = NULL;
2058 /* If we must downconvert, do the from-address here. Remember we had to
2059 for the to-addresses (done below), and also (ugly) for re-doing when building
2060 the delivery log line. */
2062 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2064 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2066 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2070 setflag(addrlist, af_utf8_downcvt);
2074 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2075 "MAIL FROM:<%s>%s\r\n", s, buffer);
2078 mail_command = string_copy(big_buffer); /* Save for later error message */
2082 case -1: /* Transmission error */
2085 case +1: /* Block was sent */
2086 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2087 ob->command_timeout))
2089 if (errno == 0 && buffer[0] == '4')
2091 errno = ERRNO_MAIL4XX;
2092 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2094 goto RESPONSE_FAILED;
2096 pending_MAIL = FALSE;
2100 /* Pass over all the relevant recipient addresses for this host, which are the
2101 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2102 several before we have to read the responses for those seen so far. This
2103 checking is done by a subroutine because it also needs to be done at the end.
2104 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2105 the next one if not all are sent.
2107 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2108 last address because we want to abort if any recipients have any kind of
2109 problem, temporary or permanent. We know that all recipient addresses will have
2110 the PENDING_DEFER status, because only one attempt is ever made, and we know
2111 that max_rcpt will be large, so all addresses will be done at once. */
2113 for (addr = first_addr;
2114 address_count < max_rcpt && addr != NULL;
2121 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2123 if (addr->transport_return != PENDING_DEFER) continue;
2126 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2128 /* Add any DSN flags to the rcpt command and add to the sent string */
2133 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2135 if ((addr->dsn_flags & rf_dsnflags) != 0)
2139 Ustrcpy(p, " NOTIFY=");
2141 for (i = 0; i < 4; i++)
2142 if ((addr->dsn_flags & rf_list[i]) != 0)
2144 if (!first) *p++ = ',';
2146 Ustrcpy(p, rf_names[i]);
2151 if (addr->dsn_orcpt != NULL)
2153 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2159 /* Now send the RCPT command, and process outstanding responses when
2160 necessary. After a timeout on RCPT, we just end the function, leaving the
2161 yield as OK, because this error can often mean that there is a problem with
2162 just one address, so we don't want to delay the host. */
2164 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2166 #ifdef EXPERIMENTAL_INTERNATIONAL
2168 uschar * dummy_errstr;
2169 if ( testflag(addrlist, af_utf8_downcvt)
2170 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2174 errno = ERRNO_EXPANDFAIL;
2180 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2181 rcpt_addr, igquotstr, buffer);
2183 if (count < 0) goto SEND_FAILED;
2186 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2187 &sync_addr, host, count, ob->address_retry_include_sender,
2188 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2191 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2192 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2195 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2196 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2197 case 0: /* No 2xx or 5xx, but no probs */
2200 case -1: goto END_OFF; /* Timeout on RCPT */
2201 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2203 pending_MAIL = FALSE; /* Dealt with MAIL */
2205 } /* Loop for next address */
2207 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2208 permanently or temporarily. We should have flushed and synced after the last
2213 address_item *badaddr;
2214 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2215 if (badaddr->transport_return != PENDING_OK)
2217 /*XXX could we find a better errno than 0 here? */
2218 set_errno(addrlist, 0, badaddr->message, FAIL,
2219 testflag(badaddr, af_pass_message), NULL);
2225 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2226 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2227 have a good recipient buffered up if we are pipelining. We don't want to waste
2228 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2229 are pipelining. The responses are all handled by sync_responses(). */
2231 if (ok || (smtp_use_pipelining && !mua_wrapper))
2233 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2234 if (count < 0) goto SEND_FAILED;
2235 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2236 host, count, ob->address_retry_include_sender, pending_MAIL,
2237 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2239 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2240 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2243 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2244 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2245 case 0: break; /* No 2xx or 5xx, but no probs */
2247 case -1: goto END_OFF; /* Timeout on RCPT */
2248 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2252 /* Save the first address of the next batch. */
2256 /* If there were no good recipients (but otherwise there have been no
2257 problems), just set ok TRUE, since we have handled address-specific errors
2258 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2259 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2260 well as body. Set the appropriate timeout value to be used for each chunk.
2261 (Haven't been able to make it work using select() for writing yet.) */
2263 if (!ok) ok = TRUE; else
2265 sigalrm_seen = FALSE;
2266 transport_write_timeout = ob->data_timeout;
2267 smtp_command = US"sending data block"; /* For error messages */
2268 DEBUG(D_transport|D_v)
2269 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2270 transport_count = 0;
2272 #ifndef DISABLE_DKIM
2273 ok = dkim_transport_write_message(addrlist, inblock.sock,
2274 topt_use_crlf | topt_end_dot | topt_escape_headers |
2275 (tblock->body_only? topt_no_headers : 0) |
2276 (tblock->headers_only? topt_no_body : 0) |
2277 (tblock->return_path_add? topt_add_return_path : 0) |
2278 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2279 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2280 0, /* No size limit */
2281 tblock->add_headers, tblock->remove_headers,
2282 US".", US"..", /* Escaping strings */
2283 tblock->rewrite_rules, tblock->rewrite_existflags,
2284 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2285 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2288 ok = transport_write_message(addrlist, inblock.sock,
2289 topt_use_crlf | topt_end_dot | topt_escape_headers |
2290 (tblock->body_only? topt_no_headers : 0) |
2291 (tblock->headers_only? topt_no_body : 0) |
2292 (tblock->return_path_add? topt_add_return_path : 0) |
2293 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2294 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2295 0, /* No size limit */
2296 tblock->add_headers, tblock->remove_headers,
2297 US".", US"..", /* Escaping strings */
2298 tblock->rewrite_rules, tblock->rewrite_existflags);
2301 /* transport_write_message() uses write() because it is called from other
2302 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2303 it can exit with "Broken pipe" as its error. This really means that the
2304 socket got closed at the far end. */
2306 transport_write_timeout = 0; /* for subsequent transports */
2308 /* Failure can either be some kind of I/O disaster (including timeout),
2309 or the failure of a transport filter or the expansion of added headers. */
2313 buffer[0] = 0; /* There hasn't been a response */
2314 goto RESPONSE_FAILED;
2317 /* We used to send the terminating "." explicitly here, but because of
2318 buffering effects at both ends of TCP/IP connections, you don't gain
2319 anything by keeping it separate, so it might as well go in the final
2320 data buffer for efficiency. This is now done by setting the topt_end_dot
2323 smtp_command = US"end of data";
2325 #ifndef DISABLE_PRDR
2326 /* For PRDR we optionally get a partial-responses warning
2327 * followed by the individual responses, before going on with
2328 * the overall response. If we don't get the warning then deal
2329 * with per non-PRDR. */
2332 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2334 if (!ok && errno == 0)
2337 case '2': prdr_active = FALSE;
2340 case '4': errno = ERRNO_DATA4XX;
2341 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2348 /* For non-PRDR SMTP, we now read a single response that applies to the
2349 whole message. If it is OK, then all the addresses have been delivered. */
2353 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2355 if (!ok && errno == 0 && buffer[0] == '4')
2357 errno = ERRNO_DATA4XX;
2358 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2362 /* For LMTP, we get back a response for every RCPT command that we sent;
2363 some may be accepted and some rejected. For those that get a response, their
2364 status is fixed; any that are accepted have been handed over, even if later
2365 responses crash - at least, that's how I read RFC 2033.
2367 If all went well, mark the recipient addresses as completed, record which
2368 host/IPaddress they were delivered to, and cut out RSET when sending another
2369 message down the same channel. Write the completed addresses to the journal
2370 now so that they are recorded in case there is a crash of hardware or
2371 software before the spool gets updated. Also record the final SMTP
2372 confirmation if needed (for SMTP only). */
2377 int delivery_time = (int)(time(NULL) - start_delivery_time);
2379 uschar *conf = NULL;
2382 /* Set up confirmation if needed - applies only to SMTP */
2385 #ifndef EXPERIMENTAL_EVENT
2386 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2391 const uschar *s = string_printing(buffer);
2392 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2393 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2396 /* Process all transported addresses - for LMTP or PRDR, read a status for
2399 for (addr = addrlist; addr != first_addr; addr = addr->next)
2401 if (addr->transport_return != PENDING_OK) continue;
2403 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2404 remaining addresses. Otherwise, it's a return code for just the one
2405 address. For temporary errors, add a retry item for the address so that
2406 it doesn't get tried again too soon. */
2408 #ifndef DISABLE_PRDR
2409 if (lmtp || prdr_active)
2414 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2417 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2418 addr->message = string_sprintf(
2419 #ifndef DISABLE_PRDR
2420 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2422 "LMTP error after %s: %s",
2424 big_buffer, string_printing(buffer));
2425 setflag(addr, af_pass_message); /* Allow message to go to user */
2426 if (buffer[0] == '5')
2427 addr->transport_return = FAIL;
2430 errno = ERRNO_DATA4XX;
2431 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2432 addr->transport_return = DEFER;
2433 #ifndef DISABLE_PRDR
2436 retry_add_item(addr, addr->address_retry_key, 0);
2440 completed_address = TRUE; /* NOW we can set this flag */
2441 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2443 const uschar *s = string_printing(buffer);
2444 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2445 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2449 /* SMTP, or success return from LMTP for this address. Pass back the
2450 actual host that was used. */
2452 addr->transport_return = OK;
2453 addr->more_errno = delivery_time;
2454 addr->host_used = host;
2455 addr->special_action = flag;
2456 addr->message = conf;
2457 #ifndef DISABLE_PRDR
2458 if (prdr_active) addr->flags |= af_prdr_used;
2462 #ifndef DISABLE_PRDR
2466 /* Update the journal. For homonymic addresses, use the base address plus
2467 the transport name. See lots of comments in deliver.c about the reasons
2468 for the complications when homonyms are involved. Just carry on after
2469 write error, as it may prove possible to update the spool file later. */
2471 if (testflag(addr, af_homonym))
2472 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2474 sprintf(CS buffer, "%.500s\n", addr->unique);
2476 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2477 len = Ustrlen(CS buffer);
2478 if (write(journal_fd, buffer, len) != len)
2479 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2480 "%s: %s", buffer, strerror(errno));
2484 #ifndef DISABLE_PRDR
2487 /* PRDR - get the final, overall response. For any non-success
2488 upgrade all the address statuses. */
2489 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2493 if(errno == 0 && buffer[0] == '4')
2495 errno = ERRNO_DATA4XX;
2496 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2498 for (addr = addrlist; addr != first_addr; addr = addr->next)
2499 if (buffer[0] == '5' || addr->transport_return == OK)
2500 addr->transport_return = PENDING_OK; /* allow set_errno action */
2501 goto RESPONSE_FAILED;
2504 /* Update the journal, or setup retry. */
2505 for (addr = addrlist; addr != first_addr; addr = addr->next)
2506 if (addr->transport_return == OK)
2508 if (testflag(addr, af_homonym))
2509 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2511 sprintf(CS buffer, "%.500s\n", addr->unique);
2513 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2514 len = Ustrlen(CS buffer);
2515 if (write(journal_fd, buffer, len) != len)
2516 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2517 "%s: %s", buffer, strerror(errno));
2519 else if (addr->transport_return == DEFER)
2520 retry_add_item(addr, addr->address_retry_key, -2);
2524 /* Ensure the journal file is pushed out to disk. */
2526 if (EXIMfsync(journal_fd) < 0)
2527 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2533 /* Handle general (not specific to one address) failures here. The value of ok
2534 is used to skip over this code on the falling through case. A timeout causes a
2535 deferral. Other errors may defer or fail according to the response code, and
2536 may set up a special errno value, e.g. after connection chopped, which is
2537 assumed if errno == 0 and there is no text in the buffer. If control reaches
2538 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2539 the problem is not related to this specific message. */
2548 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2549 buffer, &code, &message, &pass_message);
2555 message = US string_sprintf("send() to %s [%s] failed: %s",
2556 host->name, host->address, strerror(save_errno));
2560 /* This label is jumped to directly when a TLS negotiation has failed,
2561 or was not done for a host for which it is required. Values will be set
2562 in message and save_errno, and setting_up will always be true. Treat as
2563 a temporary error. */
2570 /* If the failure happened while setting up the call, see if the failure was
2571 a 5xx response (this will either be on connection, or following HELO - a 5xx
2572 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2573 never going to accept them. For other errors during setting up (timeouts or
2574 whatever), defer all addresses, and yield DEFER, so that the host is not
2575 tried again for a while. */
2578 ok = FALSE; /* For when reached by GOTO */
2583 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2586 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2591 /* We want to handle timeouts after MAIL or "." and loss of connection after
2592 "." specially. They can indicate a problem with the sender address or with
2593 the contents of the message rather than a real error on the connection. These
2594 cases are treated in the same way as a 4xx response. This next bit of code
2595 does the classification. */
2603 #ifdef EXPERIMENTAL_INTERNATIONAL
2604 case ERRNO_UTF8_FWD:
2611 message_error = TRUE;
2615 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2616 Ustrncmp(smtp_command,"end ",4) == 0;
2619 case ERRNO_SMTPCLOSED:
2620 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2624 message_error = FALSE;
2628 /* Handle the cases that are treated as message errors. These are:
2630 (a) negative response or timeout after MAIL
2631 (b) negative response after DATA
2632 (c) negative response or timeout or dropped connection after "."
2633 (d) utf8 support required and not offered
2635 It won't be a negative response or timeout after RCPT, as that is dealt
2636 with separately above. The action in all cases is to set an appropriate
2637 error code for all the addresses, but to leave yield set to OK because the
2638 host itself has not failed. Of course, it might in practice have failed
2639 when we've had a timeout, but if so, we'll discover that at the next
2640 delivery attempt. For a temporary error, set the message_defer flag, and
2641 write to the logs for information if this is not the last host. The error
2642 for the last host will be logged as part of the address's log line. */
2646 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2647 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2648 pass_message, host);
2650 /* If there's an errno, the message contains just the identity of
2653 if (code != '5') /* Anything other than 5 is treated as temporary */
2656 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2657 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2658 msglog_line(host, message);
2659 *message_defer = TRUE;
2663 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2664 ".", or some other transportation error. We defer all addresses and yield
2665 DEFER, except for the case of failed add_headers expansion, or a transport
2666 filter failure, when the yield should be ERROR, to stop it trying other
2671 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2672 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2673 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2679 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2680 SMTP session tidily. However, if there were too many addresses to send in one
2681 message (indicated by first_addr being non-NULL) we want to carry on with the
2682 rest of them. Also, it is desirable to send more than one message down the SMTP
2683 connection if there are several waiting, provided we haven't already sent so
2684 many as to hit the configured limit. The function transport_check_waiting looks
2685 for a waiting message and returns its id. Then transport_pass_socket tries to
2686 set up a continued delivery by passing the socket on to another process. The
2687 variable send_rset is FALSE if a message has just been successfully transfered.
2689 If we are already sending down a continued channel, there may be further
2690 addresses not yet delivered that are aimed at the same host, but which have not
2691 been passed in this run of the transport. In this case, continue_more will be
2692 true, and all we should do is send RSET if necessary, and return, leaving the
2695 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2696 do not want to continue with other messages down the same channel, because that
2697 can lead to looping between two or more messages, all with the same,
2698 temporarily failing address(es). [The retry information isn't updated yet, so
2699 new processes keep on trying.] We probably also don't want to try more of this
2700 message's addresses either.
2702 If we have started a TLS session, we have to end it before passing the
2703 connection to a new process. However, not all servers can handle this (Exim
2704 can), so we do not pass such a connection on if the host matches
2705 hosts_nopass_tls. */
2708 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2709 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2710 continue_more, yield, (first_addr == NULL)? "":"not ");
2712 if (completed_address && ok && send_quit)
2715 smtp_compare_t t_compare;
2717 t_compare.tblock = tblock;
2718 t_compare.current_sender_address = sender_address;
2720 if ( first_addr != NULL
2722 || ( ( tls_out.active < 0
2723 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2726 transport_check_waiting(tblock->name, host->name,
2727 tblock->connection_max_messages, new_message_id, &more,
2728 (oicf)smtp_are_same_identities, (void*)&t_compare)
2736 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2738 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2739 host->address, strerror(save_errno));
2742 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2743 ob->command_timeout)))
2746 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2750 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2751 host->name, host->address, msg);
2756 /* Either RSET was not needed, or it succeeded */
2760 if (first_addr != NULL) /* More addresses still to be sent */
2761 { /* in this run of the transport */
2762 continue_sequence++; /* Causes * in logging */
2765 if (continue_more) return yield; /* More addresses for another run */
2767 /* Pass the socket to a new Exim process. Before doing so, we must shut
2768 down TLS. Not all MTAs allow for the continuation of the SMTP session
2769 when TLS is shut down. We test for this by sending a new EHLO. If we
2770 don't get a good response, we don't attempt to pass the socket on. */
2773 if (tls_out.active >= 0)
2775 tls_close(FALSE, TRUE);
2779 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2780 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2781 ob->command_timeout);
2785 /* If the socket is successfully passed, we musn't send QUIT (or
2786 indeed anything!) from here. */
2788 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2789 new_message_id, inblock.sock))
2795 /* If RSET failed and there are addresses left, they get deferred. */
2797 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2801 /* End off tidily with QUIT unless the connection has died or the socket has
2802 been passed to another process. There has been discussion on the net about what
2803 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2804 to wait for a response, but on the other hand, there isn't anything one can do
2805 with an error response, other than log it. Exim used to do that. However,
2806 further discussion suggested that it is positively advantageous not to wait for
2807 the response, but to close the session immediately. This is supposed to move
2808 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2809 load from the server. (Hosts that are both servers and clients may not see much
2810 difference, of course.) Further discussion indicated that this was safe to do
2811 on Unix systems which have decent implementations of TCP/IP that leave the
2812 connection around for a while (TIME_WAIT) after the application has gone away.
2813 This enables the response sent by the server to be properly ACKed rather than
2814 timed out, as can happen on broken TCP/IP implementations on other OS.
2816 This change is being made on 31-Jul-98. After over a year of trouble-free
2817 operation, the old commented-out code was removed on 17-Sep-99. */
2820 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2825 tls_close(FALSE, TRUE);
2828 /* Close the socket, and return the appropriate value, first setting
2829 works because the NULL setting is passed back to the calling process, and
2830 remote_max_parallel is forced to 1 when delivering over an existing connection,
2832 If all went well and continue_more is set, we shouldn't actually get here if
2833 there are further addresses, as the return above will be taken. However,
2834 writing RSET might have failed, or there may be other addresses whose hosts are
2835 specified in the transports, and therefore not visible at top level, in which
2836 case continue_more won't get set. */
2838 (void)close(inblock.sock);
2840 #ifdef EXPERIMENTAL_EVENT
2841 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2844 continue_transport = NULL;
2845 continue_hostname = NULL;
2852 /*************************************************
2853 * Closedown entry point *
2854 *************************************************/
2856 /* This function is called when exim is passed an open smtp channel
2857 from another incarnation, but the message which it has been asked
2858 to deliver no longer exists. The channel is on stdin.
2860 We might do fancy things like looking for another message to send down
2861 the channel, but if the one we sought has gone, it has probably been
2862 delivered by some other process that itself will seek further messages,
2863 so just close down our connection.
2865 Argument: pointer to the transport instance block
2870 smtp_transport_closedown(transport_instance *tblock)
2872 smtp_transport_options_block *ob =
2873 (smtp_transport_options_block *)(tblock->options_block);
2874 smtp_inblock inblock;
2875 smtp_outblock outblock;
2877 uschar inbuffer[4096];
2878 uschar outbuffer[16];
2880 inblock.sock = fileno(stdin);
2881 inblock.buffer = inbuffer;
2882 inblock.buffersize = sizeof(inbuffer);
2883 inblock.ptr = inbuffer;
2884 inblock.ptrend = inbuffer;
2886 outblock.sock = inblock.sock;
2887 outblock.buffersize = sizeof(outbuffer);
2888 outblock.buffer = outbuffer;
2889 outblock.ptr = outbuffer;
2890 outblock.cmd_count = 0;
2891 outblock.authenticating = FALSE;
2893 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2894 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2895 ob->command_timeout);
2896 (void)close(inblock.sock);
2901 /*************************************************
2902 * Prepare addresses for delivery *
2903 *************************************************/
2905 /* This function is called to flush out error settings from previous delivery
2906 attempts to other hosts. It also records whether we got here via an MX record
2907 or not in the more_errno field of the address. We are interested only in
2908 addresses that are still marked DEFER - others may have got delivered to a
2909 previously considered IP address. Set their status to PENDING_DEFER to indicate
2910 which ones are relevant this time.
2913 addrlist the list of addresses
2914 host the host we are delivering to
2916 Returns: the first address for this delivery
2919 static address_item *
2920 prepare_addresses(address_item *addrlist, host_item *host)
2922 address_item *first_addr = NULL;
2924 for (addr = addrlist; addr != NULL; addr = addr->next)
2925 if (addr->transport_return == DEFER)
2927 if (first_addr == NULL) first_addr = addr;
2928 addr->transport_return = PENDING_DEFER;
2929 addr->basic_errno = 0;
2930 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2931 addr->message = NULL;
2933 addr->cipher = NULL;
2934 addr->ourcert = NULL;
2935 addr->peercert = NULL;
2936 addr->peerdn = NULL;
2937 addr->ocsp = OCSP_NOT_REQ;
2945 /*************************************************
2946 * Main entry point *
2947 *************************************************/
2949 /* See local README for interface details. As this is a remote transport, it is
2950 given a chain of addresses to be delivered in one connection, if possible. It
2951 always returns TRUE, indicating that each address has its own independent
2952 status set, except if there is a setting up problem, in which case it returns
2956 smtp_transport_entry(
2957 transport_instance *tblock, /* data for this instantiation */
2958 address_item *addrlist) /* addresses we are working on */
2962 int hosts_defer = 0;
2964 int hosts_looked_up = 0;
2965 int hosts_retry = 0;
2966 int hosts_serial = 0;
2967 int hosts_total = 0;
2968 int total_hosts_tried = 0;
2970 BOOL expired = TRUE;
2971 BOOL continuing = continue_hostname != NULL;
2972 uschar *expanded_hosts = NULL;
2974 uschar *tid = string_sprintf("%s transport", tblock->name);
2975 smtp_transport_options_block *ob =
2976 (smtp_transport_options_block *)(tblock->options_block);
2977 host_item *hostlist = addrlist->host_list;
2978 host_item *host = NULL;
2982 debug_printf("%s transport entered\n", tblock->name);
2983 for (addr = addrlist; addr != NULL; addr = addr->next)
2984 debug_printf(" %s\n", addr->address);
2985 if (continuing) debug_printf("already connected to %s [%s]\n",
2986 continue_hostname, continue_host_address);
2989 /* Set the flag requesting that these hosts be added to the waiting
2990 database if the delivery fails temporarily or if we are running with
2991 queue_smtp or a 2-stage queue run. This gets unset for certain
2992 kinds of error, typically those that are specific to the message. */
2994 update_waiting = TRUE;
2996 /* If a host list is not defined for the addresses - they must all have the
2997 same one in order to be passed to a single transport - or if the transport has
2998 a host list with hosts_override set, use the host list supplied with the
2999 transport. It is an error for this not to exist. */
3001 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3003 if (ob->hosts == NULL)
3005 addrlist->message = string_sprintf("%s transport called with no hosts set",
3007 addrlist->transport_return = PANIC;
3008 return FALSE; /* Only top address has status */
3011 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3014 /* If the transport's host list contains no '$' characters, and we are not
3015 randomizing, it is fixed and therefore a chain of hosts can be built once
3016 and for all, and remembered for subsequent use by other calls to this
3017 transport. If, on the other hand, the host list does contain '$', or we are
3018 randomizing its order, we have to rebuild it each time. In the fixed case,
3019 as the hosts string will never be used again, it doesn't matter that we
3020 replace all the : characters with zeros. */
3022 if (ob->hostlist == NULL)
3024 uschar *s = ob->hosts;
3026 if (Ustrchr(s, '$') != NULL)
3028 if (!(expanded_hosts = expand_string(s)))
3030 addrlist->message = string_sprintf("failed to expand list of hosts "
3031 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3032 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3033 return FALSE; /* Only top address has status */
3035 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3036 "\"%s\"\n", s, expanded_hosts);
3040 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3042 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3044 /* Check that the expansion yielded something useful. */
3045 if (hostlist == NULL)
3048 string_sprintf("%s transport has empty hosts setting", tblock->name);
3049 addrlist->transport_return = PANIC;
3050 return FALSE; /* Only top address has status */
3053 /* If there was no expansion of hosts, save the host list for
3056 if (!expanded_hosts) ob->hostlist = hostlist;
3059 /* This is not the first time this transport has been run in this delivery;
3060 the host list was built previously. */
3063 hostlist = ob->hostlist;
3066 /* The host list was supplied with the address. If hosts_randomize is set, we
3067 must sort it into a random order if it did not come from MX records and has not
3068 already been randomized (but don't bother if continuing down an existing
3071 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3073 host_item *newlist = NULL;
3074 while (hostlist != NULL)
3076 host_item *h = hostlist;
3077 hostlist = hostlist->next;
3079 h->sort_key = random_number(100);
3081 if (newlist == NULL)
3086 else if (h->sort_key < newlist->sort_key)
3093 host_item *hh = newlist;
3094 while (hh->next != NULL)
3096 if (h->sort_key < hh->next->sort_key) break;
3104 hostlist = addrlist->host_list = newlist;
3107 /* Sort out the default port. */
3109 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3111 /* For each host-plus-IP-address on the list:
3113 . If this is a continued delivery and the host isn't the one with the
3114 current connection, skip.
3116 . If the status is unusable (i.e. previously failed or retry checked), skip.
3118 . If no IP address set, get the address, either by turning the name into
3119 an address, calling gethostbyname if gethostbyname is on, or by calling
3120 the DNS. The DNS may yield multiple addresses, in which case insert the
3121 extra ones into the list.
3123 . Get the retry data if not previously obtained for this address and set the
3124 field which remembers the state of this address. Skip if the retry time is
3125 not reached. If not, remember whether retry data was found. The retry string
3126 contains both the name and the IP address.
3128 . Scan the list of addresses and mark those whose status is DEFER as
3129 PENDING_DEFER. These are the only ones that will be processed in this cycle
3132 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3133 Some addresses may be successfully delivered, others may fail, and yet
3134 others may get temporary errors and so get marked DEFER.
3136 . The return from the delivery attempt is OK if a connection was made and a
3137 valid SMTP dialogue was completed. Otherwise it is DEFER.
3139 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3141 . If fail to connect, or other defer state, add a retry item.
3143 . If there are any addresses whose status is still DEFER, carry on to the
3144 next host/IPaddress, unless we have tried the number of hosts given
3145 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3146 there is some fancy logic for hosts_max_try that means its limit can be
3147 overstepped in some circumstances.
3149 If we get to the end of the list, all hosts have deferred at least one address,
3150 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3151 delivery attempt to those hosts whose last try was before the arrival time of
3152 the current message. To cope with this, we have to go round the loop a second
3153 time. After that, set the status and error data for any addresses that haven't
3154 had it set already. */
3156 for (cutoff_retry = 0; expired &&
3157 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3160 host_item *nexthost = NULL;
3161 int unexpired_hosts_tried = 0;
3163 for (host = hostlist;
3165 unexpired_hosts_tried < ob->hosts_max_try &&
3166 total_hosts_tried < ob->hosts_max_try_hardlimit;
3172 BOOL serialized = FALSE;
3173 BOOL host_is_expired = FALSE;
3174 BOOL message_defer = FALSE;
3175 BOOL ifchanges = FALSE;
3176 BOOL some_deferred = FALSE;
3177 address_item *first_addr = NULL;
3178 uschar *interface = NULL;
3179 uschar *retry_host_key = NULL;
3180 uschar *retry_message_key = NULL;
3181 uschar *serialize_key = NULL;
3183 /* Default next host is next host. :-) But this can vary if the
3184 hosts_max_try limit is hit (see below). It may also be reset if a host
3185 address is looked up here (in case the host was multihomed). */
3187 nexthost = host->next;
3189 /* If the address hasn't yet been obtained from the host name, look it up
3190 now, unless the host is already marked as unusable. If it is marked as
3191 unusable, it means that the router was unable to find its IP address (in
3192 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3193 the lookup failed last time. We don't get this far if *all* MX records
3194 point to non-existent hosts; that is treated as a hard error.
3196 We can just skip this host entirely. When the hosts came from the router,
3197 the address will timeout based on the other host(s); when the address is
3198 looked up below, there is an explicit retry record added.
3200 Note that we mustn't skip unusable hosts if the address is not unset; they
3201 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3203 if (host->address == NULL)
3205 int new_port, flags;
3208 if (host->status >= hstatus_unusable)
3210 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3215 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3217 /* The host name is permitted to have an attached port. Find it, and
3218 strip it from the name. Just remember it for now. */
3220 new_port = host_item_get_port(host);
3222 /* Count hosts looked up */
3226 /* Find by name if so configured, or if it's an IP address. We don't
3227 just copy the IP address, because we need the test-for-local to happen. */
3229 flags = HOST_FIND_BY_A;
3230 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3231 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3233 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3234 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3236 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3237 &ob->dnssec, /* domains for request/require */
3240 /* Update the host (and any additional blocks, resulting from
3241 multihoming) with a host-specific port, if any. */
3243 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3245 /* Failure to find the host at this time (usually DNS temporary failure)
3246 is really a kind of routing failure rather than a transport failure.
3247 Therefore we add a retry item of the routing kind, not to stop us trying
3248 to look this name up here again, but to ensure the address gets timed
3249 out if the failures go on long enough. A complete failure at this point
3250 commonly points to a configuration error, but the best action is still
3251 to carry on for the next host. */
3253 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3255 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3257 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3258 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3259 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3260 host->status = hstatus_unusable;
3262 for (addr = addrlist; addr != NULL; addr = addr->next)
3264 if (addr->transport_return != DEFER) continue;
3265 addr->basic_errno = ERRNO_UNKNOWNHOST;
3267 string_sprintf("failed to lookup IP address for %s", host->name);
3272 /* If the host is actually the local host, we may have a problem, or
3273 there may be some cunning configuration going on. In the problem case,
3274 log things and give up. The default transport status is already DEFER. */
3276 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3278 for (addr = addrlist; addr != NULL; addr = addr->next)
3280 addr->basic_errno = 0;
3281 addr->message = string_sprintf("%s transport found host %s to be "
3282 "local", tblock->name, host->name);
3286 } /* End of block for IP address lookup */
3288 /* If this is a continued delivery, we are interested only in the host
3289 which matches the name of the existing open channel. The check is put
3290 here after the local host lookup, in case the name gets expanded as a
3291 result of the lookup. Set expired FALSE, to save the outer loop executing
3294 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3295 Ustrcmp(continue_host_address, host->address) != 0))
3298 continue; /* With next host */
3301 /* Reset the default next host in case a multihomed host whose addresses
3302 are not looked up till just above added to the host list. */
3304 nexthost = host->next;
3306 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3307 domain is in queue_smtp_domains, we don't actually want to attempt any
3308 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3309 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3310 were not in it. We don't want to hold up all SMTP deliveries! Except when
3311 doing a two-stage queue run, don't do this if forcing. */
3313 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3314 match_isinlist(addrlist->domain,
3315 (const uschar **)&queue_smtp_domains, 0,
3316 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3319 for (addr = addrlist; addr != NULL; addr = addr->next)
3321 if (addr->transport_return != DEFER) continue;
3322 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3324 continue; /* With next host */
3327 /* Count hosts being considered - purely for an intelligent comment
3328 if none are usable. */
3332 /* Set $host and $host address now in case they are needed for the
3333 interface expansion or the serialize_hosts check; they remain set if an
3334 actual delivery happens. */
3336 deliver_host = host->name;
3337 deliver_host_address = host->address;
3338 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3339 : host->dnssec == DS_NO ? US"no"
3342 /* Set up a string for adding to the retry key if the port number is not
3343 the standard SMTP port. A host may have its own port setting that overrides
3346 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3348 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3350 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3351 string changes upon expansion, we must add it to the key that is used for
3352 retries, because connections to the same host from a different interface
3353 should be treated separately. */
3355 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3356 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3359 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3361 /* The first time round the outer loop, check the status of the host by
3362 inspecting the retry data. The second time round, we are interested only
3363 in expired hosts that haven't been tried since this message arrived. */
3365 if (cutoff_retry == 0)
3368 /* Ensure the status of the address is set by checking retry data if
3369 necessary. There may be host-specific retry data (applicable to all
3370 messages) and also data for retries of a specific message at this host.
3371 If either of these retry records are actually read, the keys used are
3372 returned to save recomputing them later. */
3374 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3375 US"retry_include_ip_address", ob->retry_include_ip_address,
3376 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3377 continue; /* with next host */
3379 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3380 incl_ip, &retry_host_key, &retry_message_key);
3382 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3383 (host->address == NULL)? US"" : host->address, pistring,
3384 (host->status == hstatus_usable)? "usable" :
3385 (host->status == hstatus_unusable)? "unusable" :
3386 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3388 /* Skip this address if not usable at this time, noting if it wasn't
3389 actually expired, both locally and in the address. */
3391 switch (host->status)
3393 case hstatus_unusable:
3395 setflag(addrlist, af_retry_skipped);
3398 case hstatus_unusable_expired:
3401 case hwhy_retry: hosts_retry++; break;
3402 case hwhy_failed: hosts_fail++; break;
3403 case hwhy_deferred: hosts_defer++; break;
3406 /* If there was a retry message key, implying that previously there
3407 was a message-specific defer, we don't want to update the list of
3408 messages waiting for these hosts. */
3410 if (retry_message_key != NULL) update_waiting = FALSE;
3411 continue; /* With the next host or IP address */
3415 /* Second time round the loop: if the address is set but expired, and
3416 the message is newer than the last try, let it through. */
3420 if (host->address == NULL ||
3421 host->status != hstatus_unusable_expired ||
3422 host->last_try > received_time)
3425 debug_printf("trying expired host %s [%s]%s\n",
3426 host->name, host->address, pistring);
3427 host_is_expired = TRUE;
3430 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3431 it remains TRUE only if all hosts are expired and none are actually tried.
3436 /* If this host is listed as one to which access must be serialized,
3437 see if another Exim process has a connection to it, and if so, skip
3438 this host. If not, update the database to record our connection to it
3439 and remember this for later deletion. Do not do any of this if we are
3440 sending the message down a pre-existing connection. */
3443 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3445 serialize_key = string_sprintf("host-serialize-%s", host->name);
3446 if (!enq_start(serialize_key))
3449 debug_printf("skipping host %s because another Exim process "
3450 "is connected to it\n", host->name);
3457 /* OK, we have an IP address that is not waiting for its retry time to
3458 arrive (it might be expired) OR (second time round the loop) we have an
3459 expired host that hasn't been tried since the message arrived. Have a go
3460 at delivering the message to it. First prepare the addresses by flushing
3461 out the result of previous attempts, and finding the first address that
3462 is still to be delivered. */
3464 first_addr = prepare_addresses(addrlist, host);
3466 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3467 message_id, host->name, host->address, addrlist->address,
3468 (addrlist->next == NULL)? "" : ", ...");
3470 set_process_info("delivering %s to %s [%s] (%s%s)",
3471 message_id, host->name, host->address, addrlist->address,
3472 (addrlist->next == NULL)? "" : ", ...");
3474 /* This is not for real; don't do the delivery. If there are
3475 any remaining hosts, list them. */
3480 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3481 for (addr = addrlist; addr != NULL; addr = addr->next)
3483 addr->host_used = host;
3484 addr->special_action = '*';
3485 addr->message = US"delivery bypassed by -N option";
3489 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3490 "*** host and remaining hosts:\n", tblock->name);
3491 for (host2 = host; host2 != NULL; host2 = host2->next)
3492 debug_printf(" %s [%s]\n", host2->name,
3493 (host2->address == NULL)? US"unset" : host2->address);
3498 /* This is for real. If the host is expired, we don't count it for
3499 hosts_max_retry. This ensures that all hosts must expire before an address
3500 is timed out, unless hosts_max_try_hardlimit (which protects against
3501 lunatic DNS configurations) is reached.
3503 If the host is not expired and we are about to hit the hosts_max_retry
3504 limit, check to see if there is a subsequent hosts with a different MX
3505 value. If so, make that the next host, and don't count this one. This is a
3506 heuristic to make sure that different MXs do get tried. With a normal kind
3507 of retry rule, they would get tried anyway when the earlier hosts were
3508 delayed, but if the domain has a "retry every time" type of rule - as is
3509 often used for the the very large ISPs, that won't happen. */
3514 /* Make a copy of the host if it is local to this invocation
3515 of the transport. */
3519 thost = store_get(sizeof(host_item));
3521 thost->name = string_copy(host->name);
3522 thost->address = string_copy(host->address);
3527 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3531 debug_printf("hosts_max_try limit reached with this host\n");
3532 for (h = host; h != NULL; h = h->next)
3533 if (h->mx != host->mx) break;
3537 unexpired_hosts_tried--;
3538 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3539 "and will be tried\n");
3543 /* Attempt the delivery. */
3545 total_hosts_tried++;
3546 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3547 &message_defer, FALSE);
3550 OK => connection made, each address contains its result;
3551 message_defer is set for message-specific defers (when all
3552 recipients are marked defer)
3553 DEFER => there was a non-message-specific delivery problem;
3554 ERROR => there was a problem setting up the arguments for a filter,
3555 or there was a problem with expanding added headers
3558 /* If the result is not OK, there was a non-message-specific problem.
3559 If the result is DEFER, we need to write to the logs saying what happened
3560 for this particular host, except in the case of authentication and TLS
3561 failures, where the log has already been written. If all hosts defer a
3562 general message is written at the end. */
3564 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3565 first_addr->basic_errno != ERRNO_TLSFAILURE)
3566 write_logs(first_addr, host);
3568 #ifdef EXPERIMENTAL_EVENT
3570 deferred_event_raise(first_addr, host);
3573 /* If STARTTLS was accepted, but there was a failure in setting up the
3574 TLS session (usually a certificate screwup), and the host is not in
3575 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3576 TLS forcibly turned off. We have to start from scratch with a new SMTP
3577 connection. That's why the retry is done from here, not from within
3578 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3579 session, so the in-clear transmission after those errors, if permitted,
3580 happens inside smtp_deliver().] */
3584 && first_addr->basic_errno == ERRNO_TLSFAILURE
3585 && ob->tls_tempfail_tryclear
3586 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3589 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3590 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3591 first_addr = prepare_addresses(addrlist, host);
3592 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3593 &message_defer, TRUE);
3594 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3595 write_logs(first_addr, host);
3596 # ifdef EXPERIMENTAL_EVENT
3598 deferred_event_raise(first_addr, host);
3601 #endif /*SUPPORT_TLS*/
3604 /* Delivery attempt finished */
3606 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3609 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3610 message_id, host->name, host->address, addrlist->address,
3611 (addrlist->next == NULL)? "" : " (& others)", rs);
3613 /* Release serialization if set up */
3615 if (serialized) enq_end(serialize_key);
3617 /* If the result is DEFER, or if a host retry record is known to exist, we
3618 need to add an item to the retry chain for updating the retry database
3619 at the end of delivery. We only need to add the item to the top address,
3620 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3621 for any other delivery attempts using the same address. (It is copied into
3622 the unusable tree at the outer level, so even if different address blocks
3623 contain the same address, it still won't get tried again.) */
3625 if (rc == DEFER || retry_host_key != NULL)
3627 int delete_flag = (rc != DEFER)? rf_delete : 0;
3628 if (retry_host_key == NULL)
3631 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3632 US"retry_include_ip_address", ob->retry_include_ip_address,
3633 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3634 incl_ip = TRUE; /* error; use most-specific retry record */
3636 retry_host_key = incl_ip ?
3637 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3638 string_sprintf("T:%S%s", host->name, pistring);
3641 /* If a delivery of another message over an existing SMTP connection
3642 yields DEFER, we do NOT set up retry data for the host. This covers the
3643 case when there are delays in routing the addresses in the second message
3644 that are so long that the server times out. This is alleviated by not
3645 routing addresses that previously had routing defers when handling an
3646 existing connection, but even so, this case may occur (e.g. if a
3647 previously happily routed address starts giving routing defers). If the
3648 host is genuinely down, another non-continued message delivery will
3649 notice it soon enough. */
3651 if (delete_flag != 0 || !continuing)
3652 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3654 /* We may have tried an expired host, if its retry time has come; ensure
3655 the status reflects the expiry for the benefit of any other addresses. */
3659 host->status = (host_is_expired)?
3660 hstatus_unusable_expired : hstatus_unusable;
3661 host->why = hwhy_deferred;
3665 /* If message_defer is set (host was OK, but every recipient got deferred
3666 because of some message-specific problem), or if that had happened
3667 previously so that a message retry key exists, add an appropriate item
3668 to the retry chain. Note that if there was a message defer but now there is
3669 a host defer, the message defer record gets deleted. That seems perfectly
3670 reasonable. Also, stop the message from being remembered as waiting
3671 for specific hosts. */
3673 if (message_defer || retry_message_key != NULL)
3675 int delete_flag = message_defer? 0 : rf_delete;
3676 if (retry_message_key == NULL)
3679 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3680 US"retry_include_ip_address", ob->retry_include_ip_address,
3681 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3682 incl_ip = TRUE; /* error; use most-specific retry record */
3684 retry_message_key = incl_ip ?
3685 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3687 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3689 retry_add_item(addrlist, retry_message_key,
3690 rf_message | rf_host | delete_flag);
3691 update_waiting = FALSE;
3694 /* Any return other than DEFER (that is, OK or ERROR) means that the
3695 addresses have got their final statuses filled in for this host. In the OK
3696 case, see if any of them are deferred. */
3699 for (addr = addrlist; addr; addr = addr->next)
3700 if (addr->transport_return == DEFER)
3702 some_deferred = TRUE;
3706 /* If no addresses deferred or the result was ERROR, return. We do this for
3707 ERROR because a failing filter set-up or add_headers expansion is likely to
3708 fail for any host we try. */
3710 if (rc == ERROR || (rc == OK && !some_deferred))
3712 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3713 return TRUE; /* Each address has its status */
3716 /* If the result was DEFER or some individual addresses deferred, let
3717 the loop run to try other hosts with the deferred addresses, except for the
3718 case when we were trying to deliver down an existing channel and failed.
3719 Don't try any other hosts in this case. */
3721 if (continuing) break;
3723 /* If the whole delivery, or some individual addresses, were deferred and
3724 there are more hosts that could be tried, do not count this host towards
3725 the hosts_max_try limit if the age of the message is greater than the
3726 maximum retry time for this host. This means we may try try all hosts,
3727 ignoring the limit, when messages have been around for some time. This is
3728 important because if we don't try all hosts, the address will never time
3729 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3731 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3734 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3736 if (retry != NULL && retry->rules != NULL)
3738 retry_rule *last_rule;
3739 for (last_rule = retry->rules;
3740 last_rule->next != NULL;
3741 last_rule = last_rule->next);
3742 timedout = time(NULL) - received_time > last_rule->timeout;
3744 else timedout = TRUE; /* No rule => timed out */
3748 unexpired_hosts_tried--;
3749 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3750 "hosts_max_try (message older than host's retry time)\n");
3753 } /* End of loop for trying multiple hosts. */
3755 /* This is the end of the loop that repeats iff expired is TRUE and
3756 ob->delay_after_cutoff is FALSE. The second time round we will
3757 try those hosts that haven't been tried since the message arrived. */
3761 debug_printf("all IP addresses skipped or deferred at least one address\n");
3762 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3763 debug_printf("retrying IP addresses not tried since message arrived\n");
3768 /* Get here if all IP addresses are skipped or defer at least one address. In
3769 MUA wrapper mode, this will happen only for connection or other non-message-
3770 specific failures. Force the delivery status for all addresses to FAIL. */
3774 for (addr = addrlist; addr != NULL; addr = addr->next)
3775 addr->transport_return = FAIL;
3779 /* In the normal, non-wrapper case, add a standard message to each deferred
3780 address if there hasn't been an error, that is, if it hasn't actually been
3781 tried this time. The variable "expired" will be FALSE if any deliveries were
3782 actually tried, or if there was at least one host that was not expired. That
3783 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3784 a delivery has been tried, an error code will be set, and the failing of the
3785 message is handled by the retry code later.
3787 If queue_smtp is set, or this transport was called to send a subsequent message
3788 down an existing TCP/IP connection, and something caused the host not to be
3789 found, we end up here, but can detect these cases and handle them specially. */
3791 for (addr = addrlist; addr != NULL; addr = addr->next)
3793 /* If host is not NULL, it means that we stopped processing the host list
3794 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3795 means we need to behave as if some hosts were skipped because their retry
3796 time had not come. Specifically, this prevents the address from timing out.
3797 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3798 hosts were tried. */
3802 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3805 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3806 "hosts were tried\n");
3811 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3812 setflag(addr, af_retry_skipped);
3816 if (queue_smtp) /* no deliveries attempted */
3818 addr->transport_return = DEFER;
3819 addr->basic_errno = 0;
3820 addr->message = US"SMTP delivery explicitly queued";
3823 else if (addr->transport_return == DEFER &&
3824 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3825 addr->message == NULL)
3827 addr->basic_errno = ERRNO_HRETRY;
3828 if (continue_hostname != NULL)
3830 addr->message = US"no host found for existing SMTP connection";
3834 setflag(addr, af_pass_message); /* This is not a security risk */
3835 addr->message = (ob->delay_after_cutoff)?
3836 US"retry time not reached for any host after a long failure period" :
3837 US"all hosts have been failing for a long time and were last tried "
3838 "after this message arrived";
3840 /* If we are already using fallback hosts, or there are no fallback hosts
3841 defined, convert the result to FAIL to cause a bounce. */
3843 if (addr->host_list == addr->fallback_hosts ||
3844 addr->fallback_hosts == NULL)
3845 addr->transport_return = FAIL;
3849 if (hosts_retry == hosts_total)
3850 addr->message = US"retry time not reached for any host";
3851 else if (hosts_fail == hosts_total)
3852 addr->message = US"all host address lookups failed permanently";
3853 else if (hosts_defer == hosts_total)
3854 addr->message = US"all host address lookups failed temporarily";
3855 else if (hosts_serial == hosts_total)
3856 addr->message = US"connection limit reached for all hosts";
3857 else if (hosts_fail+hosts_defer == hosts_total)
3858 addr->message = US"all host address lookups failed";
3859 else addr->message = US"some host address lookups failed and retry time "
3860 "not reached for other hosts or connection limit reached";
3865 /* Update the database which keeps information about which messages are waiting
3866 for which hosts to become available. For some message-specific errors, the
3867 update_waiting flag is turned off because we don't want follow-on deliveries in
3868 those cases. If this transport instance is explicitly limited to one message
3869 per connection then follow-on deliveries are not possible and there's no need
3870 to create/update the per-transport wait-<transport_name> database. */
3872 if (update_waiting && tblock->connection_max_messages != 1)
3873 transport_update_waiting(hostlist, tblock->name);
3877 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3879 return TRUE; /* Each address has its status */
3884 /* End of transport/smtp.c */