1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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) }
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
253 ,NULL /* socks_proxy */
256 ,NULL, /* tls_certificate */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
282 /* some DSN flags for use later */
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
317 Returns: OK always (FAIL, DEFER not used)
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
327 errmsg = errmsg; /* Keep picky compilers happy */
331 /* Pass back options if required. This interface is getting very messy. */
335 tf->interface = ob->interface;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
351 if (!testflag(addrlist, af_local_host_removed))
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
371 Argument: pointer to the transport instance block
376 smtp_transport_init(transport_instance *tblock)
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
381 /* Retry_use_local_part defaults FALSE if unset */
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
386 /* Set the default port according to the protocol */
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392 /* Set up the setup entry point, to be called before subprocesses for this
395 tblock->setup = smtp_transport_setup;
397 /* Complain if any of the timeouts are zero. */
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
476 if (pass_message) setflag(addr, af_pass_message);
478 addr->transport_return = rc;
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
541 *yield = '4'; /* Default setting is to give a temporary error */
543 /* Handle response timeout */
545 if (*errno_value == ETIMEDOUT)
547 *message = US string_sprintf("SMTP timeout after %s%s",
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
555 /* Handle malformed SMTP response */
557 if (*errno_value == ERRNO_SMTPFORMAT)
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
572 if (*errno_value == ERRNO_FILTER_FAIL)
574 *message = US string_sprintf("transport filter process failed (%d)%s",
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
591 /* Handle failure to write a complete data block */
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
595 *message = US string_sprintf("failed to write a data block");
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
609 /* Handle error responses from the remote mailer. */
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
644 /* This writes to the main log and to the message log.
647 addr the address item containing error information
648 host the current host
654 write_logs(address_item *addr, host_item *host)
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
658 if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
663 message = string_sprintf("%s: %s", message, addr->message);
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
671 const uschar * s = exim_errstr(addr->basic_errno);
672 log_write(0, LOG_MAIN, "%s %s", message, s);
673 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
678 msglog_line(host_item * host, uschar * message)
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
686 #ifndef DISABLE_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
695 addr the address item containing error information
696 host the current host
702 deferred_event_raise(address_item *addr, host_item *host)
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
724 (void) event_raise(action, US"msg:host:defer",
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
797 address_item *addr = *sync_addr;
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
812 uschar flushbuffer[4096];
814 if (buffer[0] == '4')
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
823 && (errno != 0 || flushbuffer[0] == 0))
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
850 /* The address was accepted */
851 addr->host_used = host;
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
856 addr->transport_return = PENDING_OK;
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
862 if (testflag(addr, af_dr_retry_exists))
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
871 /* Timeout while reading the response */
873 else if (errno == ETIMEDOUT)
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
888 else if (errno != 0 || buffer[0] == 0)
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
895 /* Handle SMTP permanent and temporary response codes. */
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
906 /* The response was 5xx */
908 if (buffer[0] == '5')
910 addr->transport_return = FAIL;
914 /* The response was 4xx */
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
922 #ifndef DISABLE_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
933 #ifndef DISABLE_EVENT
935 msg_event_raise(US"msg:rcpt:defer", addr);
938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
941 update_waiting = FALSE;
943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
947 if (address_retry_include_sender)
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
951 retry_add_item(addr, altkey, 0);
953 else retry_add_item(addr, addr->address_retry_key, 0);
956 } /* Loop for next RCPT response */
958 /* Update where to start at for the next block of responses, unless we
959 have already handled all the addresses. */
961 if (addr != NULL) *sync_addr = addr->next;
963 /* Handle a response to DATA. If we have not had any good recipients, either
964 previously or in this block, the response is ignored. */
966 if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
972 if (pending_DATA > 0 || (yield & 1) != 0)
974 if (errno == 0 && buffer[0] == '4')
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
986 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987 present) received 3xx. If any RCPTs were handled and yielded anything other
988 than 4xx, yield will be set non-zero. */
995 /* Do the client side of smtp-level authentication */
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1009 FAIL_SEND Failed communications - transmit
1014 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1019 uschar *fail_reason = US"server did not advertise AUTH support";
1021 smtp_authenticated = FALSE;
1022 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1023 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1025 if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1029 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
1037 if (require_auth == OK ||
1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1041 fail_reason = US"no common mechanisms were found";
1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1066 /* Loop to scan supported server mechanisms */
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1077 while (*p != 0 && !isspace(*p)) p++;
1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1107 /* Failure after writing a command */
1112 /* Failure after reading a response */
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1133 /* Internal problem, message in buffer. */
1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
1147 /* If we haven't authenticated, but are required to, give up. */
1149 if (require_auth == OK && !smtp_authenticated)
1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
1161 /* Construct AUTH appendix string for MAIL TO */
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1168 Globals smtp_authenticated
1169 client_authenticated_sender
1170 Return True on error, otherwise buffer has (possibly empty) terminated string
1174 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1177 uschar *local_authenticated_sender = authenticated_sender;
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1183 if (ob->authenticated_sender != NULL)
1185 uschar *new = expand_string(ob->authenticated_sender);
1188 if (!expand_string_forcedfail)
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1196 else if (new[0] != 0) local_authenticated_sender = new;
1199 /* Add the authenticated sender address if present */
1201 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1217 #ifdef EXPERIMENTAL_DANE
1219 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1221 /* move this out to host.c given the similarity to dns_lookup() ? */
1223 const uschar * fullname = buffer;
1225 /* TLSA lookup string */
1226 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1228 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1231 return DEFER; /* just defer this TLS'd conn */
1235 return dane_required ? FAIL : DEFER;
1238 if (!dns_is_secure(dnsa))
1240 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1250 typedef struct smtp_compare_s
1252 uschar *current_sender_address;
1253 struct transport_instance *tblock;
1257 Create a unique string that identifies this message, it is based on
1258 sender_address, helo_data and tls_certificate if enabled. */
1261 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1263 address_item * addr1;
1264 uschar * if1 = US"";
1265 uschar * helo1 = US"";
1267 uschar * tlsc1 = US"";
1269 uschar * save_sender_address = sender_address;
1270 uschar * local_identity = NULL;
1271 smtp_transport_options_block * ob =
1272 (smtp_transport_options_block *)tblock->options_block;
1274 sender_address = sender;
1276 addr1 = deliver_make_addr (sender, TRUE);
1277 deliver_set_expansions(addr1);
1280 if1 = expand_string(ob->interface);
1283 helo1 = expand_string(ob->helo_data);
1286 if (ob->tls_certificate)
1287 tlsc1 = expand_string(ob->tls_certificate);
1288 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1290 local_identity = string_sprintf ("%s^%s", if1, helo1);
1293 deliver_set_expansions(NULL);
1294 sender_address = save_sender_address;
1296 return local_identity;
1301 /* This routine is a callback that is called from transport_check_waiting.
1302 This function will evaluate the incoming message versus the previous
1303 message. If the incoming message is using a different local identity then
1304 we will veto this new message. */
1307 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1310 uschar * message_local_identity,
1311 * current_local_identity,
1312 * new_sender_address;
1314 current_local_identity =
1315 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1317 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1320 message_local_identity =
1321 smtp_local_identity(new_sender_address, s_compare->tblock);
1323 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1329 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1332 if (checks & PEER_OFFERED_TLS)
1333 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_TLS;
1337 if ( checks & PEER_OFFERED_IGNQ
1338 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1339 PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_IGNQ;
1342 #ifndef DISABLE_PRDR
1343 if ( checks & PEER_OFFERED_PRDR
1344 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_PRDR;
1349 if ( checks & PEER_OFFERED_UTF8
1350 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_UTF8;
1354 if ( checks & PEER_OFFERED_DSN
1355 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~PEER_OFFERED_DSN;
1358 if ( checks & PEER_OFFERED_PIPE
1359 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1360 PCRE_EOPT, NULL, 0) < 0)
1361 checks &= ~PEER_OFFERED_PIPE;
1363 if ( checks & PEER_OFFERED_SIZE
1364 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~PEER_OFFERED_SIZE;
1371 /*************************************************
1372 * Deliver address list to given host *
1373 *************************************************/
1375 /* If continue_hostname is not null, we get here only when continuing to
1376 deliver down an existing channel. The channel was passed as the standard
1377 input. TLS is never active on a passed channel; the previous process always
1378 closes it down before passing the connection on.
1380 Otherwise, we have to make a connection to the remote host, and do the
1381 initial protocol exchange.
1383 When running as an MUA wrapper, if the sender or any recipient is rejected,
1384 temporarily or permanently, we force failure for all recipients.
1387 addrlist chain of potential addresses to deliver; only those whose
1388 transport_return field is set to PENDING_DEFER are currently
1389 being processed; others should be skipped - they have either
1390 been delivered to an earlier host or IP address, or been
1391 failed by one of them.
1392 host host to deliver to
1393 host_af AF_INET or AF_INET6
1394 port default TCP/IP port to use, in host byte order
1395 interface interface to bind to, or NULL
1396 tblock transport instance block
1397 message_defer set TRUE if yield is OK, but all addresses were deferred
1398 because of a non-recipient, non-host failure, that is, a
1399 4xx response to MAIL FROM, DATA, or ".". This is a defer
1400 that is specific to the message.
1401 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1402 a second attempt after TLS initialization fails
1404 Returns: OK - the connection was made and the delivery attempted;
1405 the result for each address is in its data block.
1406 DEFER - the connection could not be made, or something failed
1407 while setting up the SMTP session, or there was a
1408 non-message-specific error, such as a timeout.
1409 ERROR - a filter command is specified for this transport,
1410 and there was a problem setting it up; OR helo_data
1411 or add_headers or authenticated_sender is specified
1412 for this transport, and the string failed to expand
1416 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1417 uschar *interface, transport_instance *tblock,
1418 BOOL *message_defer, BOOL suppress_tls)
1421 address_item *sync_addr;
1422 address_item *first_addr = addrlist;
1427 time_t start_delivery_time = time(NULL);
1428 smtp_transport_options_block *ob =
1429 (smtp_transport_options_block *)(tblock->options_block);
1430 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1431 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1433 BOOL send_rset = TRUE;
1434 BOOL send_quit = TRUE;
1435 BOOL setting_up = TRUE;
1436 BOOL completed_address = FALSE;
1439 BOOL pass_message = FALSE;
1440 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1441 #ifndef DISABLE_PRDR
1445 BOOL utf8_needed = FALSE;
1447 BOOL dsn_all_lasthop = TRUE;
1448 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1450 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1451 dns_answer tlsa_dnsa;
1453 smtp_inblock inblock;
1454 smtp_outblock outblock;
1455 int max_rcpt = tblock->max_addresses;
1456 uschar *igquotstr = US"";
1458 #ifdef EXPERIMENTAL_DSN_INFO
1459 uschar *smtp_greeting = NULL;
1460 uschar *helo_response = NULL;
1462 uschar *helo_data = NULL;
1464 uschar *message = NULL;
1465 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1467 uschar buffer[4096];
1468 uschar inbuffer[4096];
1469 uschar outbuffer[4096];
1471 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1473 *message_defer = FALSE;
1474 smtp_command = US"initial connection";
1475 if (max_rcpt == 0) max_rcpt = 999999;
1477 /* Set up the buffer for reading SMTP response packets. */
1479 inblock.buffer = inbuffer;
1480 inblock.buffersize = sizeof(inbuffer);
1481 inblock.ptr = inbuffer;
1482 inblock.ptrend = inbuffer;
1484 /* Set up the buffer for holding SMTP commands while pipelining */
1486 outblock.buffer = outbuffer;
1487 outblock.buffersize = sizeof(outbuffer);
1488 outblock.ptr = outbuffer;
1489 outblock.cmd_count = 0;
1490 outblock.authenticating = FALSE;
1492 /* Reset the parameters of a TLS session. */
1495 tls_out.cipher = NULL; /* the one we may use for this transport */
1496 tls_out.ourcert = NULL;
1497 tls_out.peercert = NULL;
1498 tls_out.peerdn = NULL;
1499 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1502 tls_out.ocsp = OCSP_NOT_REQ;
1504 /* Flip the legacy TLS-related variables over to the outbound set in case
1505 they're used in the context of the transport. Don't bother resetting
1506 afterward as we're in a subprocess. */
1508 tls_modify_variables(&tls_out);
1513 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1519 /* Make a connection to the host if this isn't a continued delivery, and handle
1520 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1521 specially so they can be identified for retries. */
1523 if (continue_hostname == NULL)
1525 /* This puts port into host->port */
1526 inblock.sock = outblock.sock =
1527 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1529 if (inblock.sock < 0)
1531 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1532 NULL, DEFER, FALSE);
1536 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1538 tls_out.dane_verified = FALSE;
1539 tls_out.tlsa_usage = 0;
1541 if (host->dnssec == DS_YES)
1544 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1547 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK)
1549 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1550 string_sprintf("DANE error: tlsa lookup %s",
1551 rc == DEFER ? "DEFER" : "FAIL"),
1558 else if (dane_required)
1560 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1561 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1567 ob->tls_tempfail_tryclear = FALSE;
1571 /* Expand the greeting message while waiting for the initial response. (Makes
1572 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1573 delayed till here so that $sending_interface and $sending_port are set. */
1575 helo_data = expand_string(ob->helo_data);
1579 uschar * errstr = NULL;
1580 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1582 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1583 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1590 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1591 is nevertheless a reasonably clean way of programming this kind of logic,
1592 where you want to escape on any error. */
1596 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1597 '2', ob->command_timeout);
1598 #ifdef EXPERIMENTAL_DSN_INFO
1599 smtp_greeting = string_copy(buffer);
1601 if (!good_response) goto RESPONSE_FAILED;
1603 #ifndef DISABLE_EVENT
1606 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1607 : host->dnssec==DS_NO ? US"no" : NULL;
1608 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1611 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1612 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1620 /* Now check if the helo_data expansion went well, and sign off cleanly if
1623 if (helo_data == NULL)
1625 uschar *message = string_sprintf("failed to expand helo_data: %s",
1626 expand_string_message);
1627 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1633 /** Debugging without sending a message
1634 addrlist->transport_return = DEFER;
1638 /* Errors that occur after this point follow an SMTP command, which is
1639 left in big_buffer by smtp_write_command() for use in error messages. */
1641 smtp_command = big_buffer;
1643 /* Tell the remote who we are...
1645 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1646 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1647 greeting is of this form. The assumption was that the far end supports it
1648 properly... but experience shows that there are some that give 5xx responses,
1649 even though the banner includes "ESMTP" (there's a bloody-minded one that
1650 says "ESMTP not spoken here"). Cope with that case.
1652 September 2000: Time has passed, and it seems reasonable now to always send
1653 EHLO at the start. It is also convenient to make the change while installing
1656 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1657 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1658 would be no way to send out the mails, so there is now a host list
1659 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1660 PIPELINING problem as well. Maybe it can also be useful to cure other
1661 problems with broken servers.
1663 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1664 Then somebody tried it with a Microsoft mailer... It seems that all other
1665 mailers use upper case for some reason (the RFC is quite clear about case
1666 independence) so, for peace of mind, I gave in. */
1668 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1670 /* Alas; be careful, since this goto is not an error-out, so conceivably
1671 we might set data between here and the target which we assume to exist
1672 and be usable. I can see this coming back to bite us. */
1677 suppress_tls = FALSE;
1678 ob->tls_tempfail_tryclear = FALSE;
1679 smtp_command = US"SSL-on-connect";
1686 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1687 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1689 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1690 ob->command_timeout))
1692 if (errno != 0 || buffer[0] == 0 || lmtp)
1694 #ifdef EXPERIMENTAL_DSN_INFO
1695 helo_response = string_copy(buffer);
1697 goto RESPONSE_FAILED;
1701 #ifdef EXPERIMENTAL_DSN_INFO
1702 helo_response = string_copy(buffer);
1708 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1715 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1717 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1718 '2', ob->command_timeout);
1719 #ifdef EXPERIMENTAL_DSN_INFO
1720 helo_response = string_copy(buffer);
1722 if (!good_response) goto RESPONSE_FAILED;
1726 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1728 | 0 /* IGNQ checked later */
1729 | 0 /* PRDR checked later */
1730 | 0 /* UTF8 checked later */
1731 | 0 /* DSN checked later */
1732 | 0 /* PIPE checked later */
1733 | 0 /* SIZE checked later */
1736 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1739 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1743 /* For continuing deliveries down the same channel, the socket is the standard
1744 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1745 below). Set up the pointer to where subsequent commands will be left, for
1746 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1747 set from the command line if they were set in the process that passed the
1750 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1751 as the contine goes via transport_pass_socket() and doublefork and exec.
1752 It does not wait. Unclear how we keep separate host's responses
1753 separate - we could match up by host ip+port as a bodge. */
1757 inblock.sock = outblock.sock = fileno(stdin);
1758 smtp_command = big_buffer;
1759 host->port = port; /* Record the port that was used */
1762 /* If TLS is available on this connection, whether continued or not, attempt to
1763 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1764 send another EHLO - the server may give a different answer in secure mode. We
1765 use a separate buffer for reading the response to STARTTLS so that if it is
1766 negative, the original EHLO data is available for subsequent analysis, should
1767 the client not be required to use TLS. If the response is bad, copy the buffer
1768 for error analysis. */
1773 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1775 uschar buffer2[4096];
1776 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1779 /* If there is an I/O error, transmission of this message is deferred. If
1780 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1781 false, we also defer. However, if there is a temporary rejection of STARTTLS
1782 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1783 STARTTLS, we carry on. This means we will try to send the message in clear,
1784 unless the host is in hosts_require_tls (tested below). */
1786 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1787 ob->command_timeout))
1791 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1794 Ustrncpy(buffer, buffer2, sizeof(buffer));
1795 goto RESPONSE_FAILED;
1799 /* STARTTLS accepted: try to negotiate a TLS session. */
1804 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1805 # ifdef EXPERIMENTAL_DANE
1806 , dane ? &tlsa_dnsa : NULL
1810 /* TLS negotiation failed; give an error. From outside, this function may
1811 be called again to try in clear on a new connection, if the options permit
1812 it for this host. */
1816 # ifdef EXPERIMENTAL_DANE
1817 if (rc == DEFER && dane)
1819 log_write(0, LOG_MAIN,
1820 "DANE attempt failed; no TLS connection to %s [%s]",
1821 host->name, host->address);
1825 save_errno = ERRNO_TLSFAILURE;
1826 message = US"failure while setting up TLS session";
1831 /* TLS session is set up */
1833 for (addr = addrlist; addr; addr = addr->next)
1834 if (addr->transport_return == PENDING_DEFER)
1836 addr->cipher = tls_out.cipher;
1837 addr->ourcert = tls_out.ourcert;
1838 addr->peercert = tls_out.peercert;
1839 addr->peerdn = tls_out.peerdn;
1840 addr->ocsp = tls_out.ocsp;
1845 /* if smtps, we'll have smtp_command set to something else; always safe to
1847 smtp_command = big_buffer;
1849 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1850 helo_data is null, we are dealing with a connection that was passed from
1851 another process, and so we won't have expanded helo_data above. We have to
1852 expand it here. $sending_ip_address and $sending_port are set up right at the
1853 start of the Exim process (in exim.c). */
1855 if (tls_out.active >= 0)
1860 if (helo_data == NULL)
1862 helo_data = expand_string(ob->helo_data);
1863 if (helo_data == NULL)
1865 uschar *message = string_sprintf("failed to expand helo_data: %s",
1866 expand_string_message);
1867 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1873 /* For SMTPS we need to wait for the initial OK response. */
1876 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1877 '2', ob->command_timeout);
1878 #ifdef EXPERIMENTAL_DSN_INFO
1879 smtp_greeting = string_copy(buffer);
1881 if (!good_response) goto RESPONSE_FAILED;
1885 greeting_cmd = "EHLO";
1888 greeting_cmd = "HELO";
1890 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1893 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1894 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1896 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1897 '2', ob->command_timeout);
1898 #ifdef EXPERIMENTAL_DSN_INFO
1899 helo_response = string_copy(buffer);
1901 if (!good_response) goto RESPONSE_FAILED;
1904 /* If the host is required to use a secure channel, ensure that we
1908 # ifdef EXPERIMENTAL_DANE
1911 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1914 save_errno = ERRNO_TLSREQUIRED;
1915 message = string_sprintf("a TLS session is required, but %s",
1916 tls_offered? "an attempt to start TLS failed" :
1917 "the server did not offer TLS support");
1920 #endif /*SUPPORT_TLS*/
1922 /* If TLS is active, we have just started it up and re-done the EHLO command,
1923 so its response needs to be analyzed. If TLS is not active and this is a
1924 continued session down a previously-used socket, we haven't just done EHLO, so
1927 if (continue_hostname == NULL
1929 || tls_out.active >= 0
1934 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1936 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1939 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1940 /*XXX if we hand peercaps on to continued-conn processes,
1941 must not depend on this addr */
1945 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1948 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1949 lmtp_ignore_quota option was set. */
1951 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1953 /* If the response to EHLO specified support for the SIZE parameter, note
1954 this, provided size_addition is non-negative. */
1956 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1958 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1959 the current host, esmtp will be false, so PIPELINING can never be used. If
1960 the current host matches hosts_avoid_pipelining, don't do it. */
1962 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1963 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1965 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1966 smtp_use_pipelining ? "" : "not ");
1968 #ifndef DISABLE_PRDR
1969 if ( peer_offered & PEER_OFFERED_PRDR
1970 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1971 peer_offered &= ~PEER_OFFERED_PRDR;
1973 if (peer_offered & PEER_OFFERED_PRDR)
1974 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1977 /* Note if the server supports DSN */
1978 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1979 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1981 /* Note if the response to EHLO specifies support for the AUTH extension.
1982 If it has, check that this host is one we want to authenticate to, and do
1983 the business. The host name and address must be available when the
1984 authenticator's client driver is running. */
1986 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1987 ob, esmtp, &inblock, &outblock))
1989 default: goto SEND_QUIT;
1991 case FAIL_SEND: goto SEND_FAILED;
1992 case FAIL: goto RESPONSE_FAILED;
1996 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1997 message-specific. */
2002 if (addrlist->prop.utf8_msg)
2004 utf8_needed = !addrlist->prop.utf8_downcvt
2005 && !addrlist->prop.utf8_downcvt_maybe;
2006 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2007 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2010 /* If this is an international message we need the host to speak SMTPUTF8 */
2011 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2013 errno = ERRNO_UTF8_FWD;
2014 goto RESPONSE_FAILED;
2018 /* If there is a filter command specified for this transport, we can now
2019 set it up. This cannot be done until the identify of the host is known. */
2021 if (tblock->filter_command != NULL)
2025 sprintf(CS buffer, "%.50s transport", tblock->name);
2026 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2027 TRUE, DEFER, addrlist, buffer, NULL);
2028 transport_filter_timeout = tblock->filter_timeout;
2030 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2035 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2043 /* For messages that have more than the maximum number of envelope recipients,
2044 we want to send several transactions down the same SMTP connection. (See
2045 comments in deliver.c as to how this reconciles, heuristically, with
2046 remote_max_parallel.) This optimization was added to Exim after the following
2047 code was already working. The simplest way to put it in without disturbing the
2048 code was to use a goto to jump back to this point when there is another
2049 transaction to handle. */
2052 sync_addr = first_addr;
2056 completed_address = FALSE;
2059 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2060 qualification, send it, adding something to the message size to allow for
2061 imprecision and things that get added en route. Exim keeps the number of lines
2062 in a message, so we can give an accurate value for the original message, but we
2063 need some additional to handle added headers. (Double "." characters don't get
2064 included in the count.) */
2071 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2075 #ifndef DISABLE_PRDR
2076 prdr_active = FALSE;
2077 if (peer_offered & PEER_OFFERED_PRDR)
2078 for (addr = first_addr; addr; addr = addr->next)
2079 if (addr->transport_return == PENDING_DEFER)
2081 for (addr = addr->next; addr; addr = addr->next)
2082 if (addr->transport_return == PENDING_DEFER)
2083 { /* at least two recipients to send */
2085 sprintf(CS p, " PRDR"); p += 5;
2093 if ( addrlist->prop.utf8_msg
2094 && !addrlist->prop.utf8_downcvt
2095 && peer_offered & PEER_OFFERED_UTF8
2097 sprintf(CS p, " SMTPUTF8"), p += 9;
2100 /* check if all addresses have lasthop flag */
2101 /* do not send RET and ENVID if true */
2102 for (dsn_all_lasthop = TRUE, addr = first_addr;
2103 address_count < max_rcpt && addr != NULL;
2105 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2107 dsn_all_lasthop = FALSE;
2111 /* Add any DSN flags to the mail command */
2113 if (smtp_use_dsn && !dsn_all_lasthop)
2115 if (dsn_ret == dsn_ret_hdrs)
2117 Ustrcpy(p, " RET=HDRS");
2120 else if (dsn_ret == dsn_ret_full)
2122 Ustrcpy(p, " RET=FULL");
2125 if (dsn_envid != NULL)
2127 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2132 /* If an authenticated_sender override has been specified for this transport
2133 instance, expand it. If the expansion is forced to fail, and there was already
2134 an authenticated_sender for this message, the original value will be used.
2135 Other expansion failures are serious. An empty result is ignored, but there is
2136 otherwise no check - this feature is expected to be used with LMTP and other
2137 cases where non-standard addresses (e.g. without domains) might be required. */
2139 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2145 /* From here until we send the DATA command, we can make use of PIPELINING
2146 if the server host supports it. The code has to be able to check the responses
2147 at any point, for when the buffer fills up, so we write it totally generally.
2148 When PIPELINING is off, each command written reports that it has flushed the
2151 pending_MAIL = TRUE; /* The block starts with MAIL */
2154 uschar * s = return_path;
2156 uschar * errstr = NULL;
2158 /* If we must downconvert, do the from-address here. Remember we had to
2159 for the to-addresses (done below), and also (ugly) for re-doing when building
2160 the delivery log line. */
2162 if ( addrlist->prop.utf8_msg
2163 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2166 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2172 setflag(addrlist, af_utf8_downcvt);
2176 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2177 "MAIL FROM:<%s>%s\r\n", s, buffer);
2180 mail_command = string_copy(big_buffer); /* Save for later error message */
2184 case -1: /* Transmission error */
2187 case +1: /* Block was sent */
2188 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2189 ob->command_timeout))
2191 if (errno == 0 && buffer[0] == '4')
2193 errno = ERRNO_MAIL4XX;
2194 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2196 goto RESPONSE_FAILED;
2198 pending_MAIL = FALSE;
2202 /* Pass over all the relevant recipient addresses for this host, which are the
2203 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2204 several before we have to read the responses for those seen so far. This
2205 checking is done by a subroutine because it also needs to be done at the end.
2206 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2207 the next one if not all are sent.
2209 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2210 last address because we want to abort if any recipients have any kind of
2211 problem, temporary or permanent. We know that all recipient addresses will have
2212 the PENDING_DEFER status, because only one attempt is ever made, and we know
2213 that max_rcpt will be large, so all addresses will be done at once. */
2215 for (addr = first_addr;
2216 address_count < max_rcpt && addr != NULL;
2223 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2225 if (addr->transport_return != PENDING_DEFER) continue;
2228 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2230 /* Add any DSN flags to the rcpt command and add to the sent string */
2235 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2237 if ((addr->dsn_flags & rf_dsnflags) != 0)
2241 Ustrcpy(p, " NOTIFY=");
2243 for (i = 0; i < 4; i++)
2244 if ((addr->dsn_flags & rf_list[i]) != 0)
2246 if (!first) *p++ = ',';
2248 Ustrcpy(p, rf_names[i]);
2253 if (addr->dsn_orcpt != NULL)
2255 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2261 /* Now send the RCPT command, and process outstanding responses when
2262 necessary. After a timeout on RCPT, we just end the function, leaving the
2263 yield as OK, because this error can often mean that there is a problem with
2264 just one address, so we don't want to delay the host. */
2266 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2270 uschar * dummy_errstr;
2271 if ( testflag(addrlist, af_utf8_downcvt)
2272 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2276 errno = ERRNO_EXPANDFAIL;
2282 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2283 rcpt_addr, igquotstr, buffer);
2285 if (count < 0) goto SEND_FAILED;
2288 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2289 &sync_addr, host, count, ob->address_retry_include_sender,
2290 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2293 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2294 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2297 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2298 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2299 case 0: /* No 2xx or 5xx, but no probs */
2302 case -1: goto END_OFF; /* Timeout on RCPT */
2303 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2305 pending_MAIL = FALSE; /* Dealt with MAIL */
2307 } /* Loop for next address */
2309 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2310 permanently or temporarily. We should have flushed and synced after the last
2315 address_item *badaddr;
2316 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2317 if (badaddr->transport_return != PENDING_OK)
2319 /*XXX could we find a better errno than 0 here? */
2320 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2321 testflag(badaddr, af_pass_message));
2327 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2328 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2329 have a good recipient buffered up if we are pipelining. We don't want to waste
2330 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2331 are pipelining. The responses are all handled by sync_responses(). */
2333 if (ok || (smtp_use_pipelining && !mua_wrapper))
2335 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2336 if (count < 0) goto SEND_FAILED;
2337 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2338 host, count, ob->address_retry_include_sender, pending_MAIL,
2339 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2341 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2342 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2345 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2346 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2347 case 0: break; /* No 2xx or 5xx, but no probs */
2349 case -1: goto END_OFF; /* Timeout on RCPT */
2350 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2354 /* Save the first address of the next batch. */
2358 /* If there were no good recipients (but otherwise there have been no
2359 problems), just set ok TRUE, since we have handled address-specific errors
2360 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2361 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2362 well as body. Set the appropriate timeout value to be used for each chunk.
2363 (Haven't been able to make it work using select() for writing yet.) */
2365 if (!ok) ok = TRUE; else
2367 sigalrm_seen = FALSE;
2368 transport_write_timeout = ob->data_timeout;
2369 smtp_command = US"sending data block"; /* For error messages */
2370 DEBUG(D_transport|D_v)
2371 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2372 transport_count = 0;
2374 #ifndef DISABLE_DKIM
2375 ok = dkim_transport_write_message(addrlist, inblock.sock,
2376 topt_use_crlf | topt_end_dot | topt_escape_headers |
2377 (tblock->body_only? topt_no_headers : 0) |
2378 (tblock->headers_only? topt_no_body : 0) |
2379 (tblock->return_path_add? topt_add_return_path : 0) |
2380 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2381 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2382 0, /* No size limit */
2383 tblock->add_headers, tblock->remove_headers,
2384 US".", US"..", /* Escaping strings */
2385 tblock->rewrite_rules, tblock->rewrite_existflags,
2386 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2387 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2390 ok = transport_write_message(addrlist, inblock.sock,
2391 topt_use_crlf | topt_end_dot | topt_escape_headers |
2392 (tblock->body_only? topt_no_headers : 0) |
2393 (tblock->headers_only? topt_no_body : 0) |
2394 (tblock->return_path_add? topt_add_return_path : 0) |
2395 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2396 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2397 0, /* No size limit */
2398 tblock->add_headers, tblock->remove_headers,
2399 US".", US"..", /* Escaping strings */
2400 tblock->rewrite_rules, tblock->rewrite_existflags);
2403 /* transport_write_message() uses write() because it is called from other
2404 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2405 it can exit with "Broken pipe" as its error. This really means that the
2406 socket got closed at the far end. */
2408 transport_write_timeout = 0; /* for subsequent transports */
2410 /* Failure can either be some kind of I/O disaster (including timeout),
2411 or the failure of a transport filter or the expansion of added headers. */
2415 buffer[0] = 0; /* There hasn't been a response */
2416 goto RESPONSE_FAILED;
2419 /* We used to send the terminating "." explicitly here, but because of
2420 buffering effects at both ends of TCP/IP connections, you don't gain
2421 anything by keeping it separate, so it might as well go in the final
2422 data buffer for efficiency. This is now done by setting the topt_end_dot
2425 smtp_command = US"end of data";
2427 #ifndef DISABLE_PRDR
2428 /* For PRDR we optionally get a partial-responses warning
2429 * followed by the individual responses, before going on with
2430 * the overall response. If we don't get the warning then deal
2431 * with per non-PRDR. */
2434 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2436 if (!ok && errno == 0)
2439 case '2': prdr_active = FALSE;
2442 case '4': errno = ERRNO_DATA4XX;
2443 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2450 /* For non-PRDR SMTP, we now read a single response that applies to the
2451 whole message. If it is OK, then all the addresses have been delivered. */
2455 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2457 if (!ok && errno == 0 && buffer[0] == '4')
2459 errno = ERRNO_DATA4XX;
2460 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2464 /* For LMTP, we get back a response for every RCPT command that we sent;
2465 some may be accepted and some rejected. For those that get a response, their
2466 status is fixed; any that are accepted have been handed over, even if later
2467 responses crash - at least, that's how I read RFC 2033.
2469 If all went well, mark the recipient addresses as completed, record which
2470 host/IPaddress they were delivered to, and cut out RSET when sending another
2471 message down the same channel. Write the completed addresses to the journal
2472 now so that they are recorded in case there is a crash of hardware or
2473 software before the spool gets updated. Also record the final SMTP
2474 confirmation if needed (for SMTP only). */
2479 int delivery_time = (int)(time(NULL) - start_delivery_time);
2481 uschar *conf = NULL;
2484 /* Set up confirmation if needed - applies only to SMTP */
2487 #ifdef DISABLE_EVENT
2488 LOGGING(smtp_confirmation) &&
2493 const uschar *s = string_printing(buffer);
2494 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2495 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2498 /* Process all transported addresses - for LMTP or PRDR, read a status for
2501 for (addr = addrlist; addr != first_addr; addr = addr->next)
2503 if (addr->transport_return != PENDING_OK) continue;
2505 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2506 remaining addresses. Otherwise, it's a return code for just the one
2507 address. For temporary errors, add a retry item for the address so that
2508 it doesn't get tried again too soon. */
2510 #ifndef DISABLE_PRDR
2511 if (lmtp || prdr_active)
2516 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2519 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2520 addr->message = string_sprintf(
2521 #ifndef DISABLE_PRDR
2522 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2524 "LMTP error after %s: %s",
2526 big_buffer, string_printing(buffer));
2527 setflag(addr, af_pass_message); /* Allow message to go to user */
2528 if (buffer[0] == '5')
2529 addr->transport_return = FAIL;
2532 errno = ERRNO_DATA4XX;
2533 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2534 addr->transport_return = DEFER;
2535 #ifndef DISABLE_PRDR
2538 retry_add_item(addr, addr->address_retry_key, 0);
2542 completed_address = TRUE; /* NOW we can set this flag */
2543 if (LOGGING(smtp_confirmation))
2545 const uschar *s = string_printing(buffer);
2546 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2547 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2551 /* SMTP, or success return from LMTP for this address. Pass back the
2552 actual host that was used. */
2554 addr->transport_return = OK;
2555 addr->more_errno = delivery_time;
2556 addr->host_used = host;
2557 addr->special_action = flag;
2558 addr->message = conf;
2559 #ifndef DISABLE_PRDR
2560 if (prdr_active) addr->flags |= af_prdr_used;
2564 #ifndef DISABLE_PRDR
2568 /* Update the journal. For homonymic addresses, use the base address plus
2569 the transport name. See lots of comments in deliver.c about the reasons
2570 for the complications when homonyms are involved. Just carry on after
2571 write error, as it may prove possible to update the spool file later. */
2573 if (testflag(addr, af_homonym))
2574 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2576 sprintf(CS buffer, "%.500s\n", addr->unique);
2578 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2579 len = Ustrlen(CS buffer);
2580 if (write(journal_fd, buffer, len) != len)
2581 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2582 "%s: %s", buffer, strerror(errno));
2586 #ifndef DISABLE_PRDR
2589 /* PRDR - get the final, overall response. For any non-success
2590 upgrade all the address statuses. */
2591 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2595 if(errno == 0 && buffer[0] == '4')
2597 errno = ERRNO_DATA4XX;
2598 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2600 for (addr = addrlist; addr != first_addr; addr = addr->next)
2601 if (buffer[0] == '5' || addr->transport_return == OK)
2602 addr->transport_return = PENDING_OK; /* allow set_errno action */
2603 goto RESPONSE_FAILED;
2606 /* Update the journal, or setup retry. */
2607 for (addr = addrlist; addr != first_addr; addr = addr->next)
2608 if (addr->transport_return == OK)
2610 if (testflag(addr, af_homonym))
2611 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2613 sprintf(CS buffer, "%.500s\n", addr->unique);
2615 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2616 len = Ustrlen(CS buffer);
2617 if (write(journal_fd, buffer, len) != len)
2618 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2619 "%s: %s", buffer, strerror(errno));
2621 else if (addr->transport_return == DEFER)
2622 retry_add_item(addr, addr->address_retry_key, -2);
2626 /* Ensure the journal file is pushed out to disk. */
2628 if (EXIMfsync(journal_fd) < 0)
2629 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2635 /* Handle general (not specific to one address) failures here. The value of ok
2636 is used to skip over this code on the falling through case. A timeout causes a
2637 deferral. Other errors may defer or fail according to the response code, and
2638 may set up a special errno value, e.g. after connection chopped, which is
2639 assumed if errno == 0 and there is no text in the buffer. If control reaches
2640 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2641 the problem is not related to this specific message. */
2646 uschar * set_message;
2652 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2653 buffer, &code, &message, &pass_message);
2661 message = US string_sprintf("send() to %s [%s] failed: %s",
2662 host->name, host->address, strerror(save_errno));
2667 /* This label is jumped to directly when a TLS negotiation has failed,
2668 or was not done for a host for which it is required. Values will be set
2669 in message and save_errno, and setting_up will always be true. Treat as
2670 a temporary error. */
2677 /* If the failure happened while setting up the call, see if the failure was
2678 a 5xx response (this will either be on connection, or following HELO - a 5xx
2679 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2680 never going to accept them. For other errors during setting up (timeouts or
2681 whatever), defer all addresses, and yield DEFER, so that the host is not
2682 tried again for a while. */
2685 ok = FALSE; /* For when reached by GOTO */
2686 set_message = message;
2693 yield = set_rc = DEFER;
2696 /* We want to handle timeouts after MAIL or "." and loss of connection after
2697 "." specially. They can indicate a problem with the sender address or with
2698 the contents of the message rather than a real error on the connection. These
2699 cases are treated in the same way as a 4xx response. This next bit of code
2700 does the classification. */
2709 case ERRNO_UTF8_FWD:
2716 message_error = TRUE;
2720 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2721 Ustrncmp(smtp_command,"end ",4) == 0;
2724 case ERRNO_SMTPCLOSED:
2725 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2729 message_error = FALSE;
2733 /* Handle the cases that are treated as message errors. These are:
2735 (a) negative response or timeout after MAIL
2736 (b) negative response after DATA
2737 (c) negative response or timeout or dropped connection after "."
2738 (d) utf8 support required and not offered
2740 It won't be a negative response or timeout after RCPT, as that is dealt
2741 with separately above. The action in all cases is to set an appropriate
2742 error code for all the addresses, but to leave yield set to OK because the
2743 host itself has not failed. Of course, it might in practice have failed
2744 when we've had a timeout, but if so, we'll discover that at the next
2745 delivery attempt. For a temporary error, set the message_defer flag, and
2746 write to the logs for information if this is not the last host. The error
2747 for the last host will be logged as part of the address's log line. */
2751 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2753 /* If there's an errno, the message contains just the identity of
2758 else /* Anything other than 5 is treated as temporary */
2762 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2763 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2764 msglog_line(host, message);
2765 *message_defer = TRUE;
2769 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2770 ".", or some other transportation error. We defer all addresses and yield
2771 DEFER, except for the case of failed add_headers expansion, or a transport
2772 filter failure, when the yield should be ERROR, to stop it trying other
2778 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2779 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2783 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2784 #ifdef EXPERIMENTAL_DSN_INFO
2785 , smtp_greeting, helo_response
2791 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2792 SMTP session tidily. However, if there were too many addresses to send in one
2793 message (indicated by first_addr being non-NULL) we want to carry on with the
2794 rest of them. Also, it is desirable to send more than one message down the SMTP
2795 connection if there are several waiting, provided we haven't already sent so
2796 many as to hit the configured limit. The function transport_check_waiting looks
2797 for a waiting message and returns its id. Then transport_pass_socket tries to
2798 set up a continued delivery by passing the socket on to another process. The
2799 variable send_rset is FALSE if a message has just been successfully transfered.
2801 If we are already sending down a continued channel, there may be further
2802 addresses not yet delivered that are aimed at the same host, but which have not
2803 been passed in this run of the transport. In this case, continue_more will be
2804 true, and all we should do is send RSET if necessary, and return, leaving the
2807 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2808 do not want to continue with other messages down the same channel, because that
2809 can lead to looping between two or more messages, all with the same,
2810 temporarily failing address(es). [The retry information isn't updated yet, so
2811 new processes keep on trying.] We probably also don't want to try more of this
2812 message's addresses either.
2814 If we have started a TLS session, we have to end it before passing the
2815 connection to a new process. However, not all servers can handle this (Exim
2816 can), so we do not pass such a connection on if the host matches
2817 hosts_nopass_tls. */
2820 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2821 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2822 continue_more, yield, (first_addr == NULL)? "":"not ");
2824 if (completed_address && ok && send_quit)
2827 smtp_compare_t t_compare;
2829 t_compare.tblock = tblock;
2830 t_compare.current_sender_address = sender_address;
2832 if ( first_addr != NULL
2834 || ( ( tls_out.active < 0
2835 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2838 transport_check_waiting(tblock->name, host->name,
2839 tblock->connection_max_messages, new_message_id, &more,
2840 (oicf)smtp_are_same_identities, (void*)&t_compare)
2848 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2850 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2851 host->address, strerror(save_errno));
2854 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2855 ob->command_timeout)))
2858 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2862 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2863 host->name, host->address, msg);
2868 /* Either RSET was not needed, or it succeeded */
2872 if (first_addr != NULL) /* More addresses still to be sent */
2873 { /* in this run of the transport */
2874 continue_sequence++; /* Causes * in logging */
2877 if (continue_more) return yield; /* More addresses for another run */
2879 /* Pass the socket to a new Exim process. Before doing so, we must shut
2880 down TLS. Not all MTAs allow for the continuation of the SMTP session
2881 when TLS is shut down. We test for this by sending a new EHLO. If we
2882 don't get a good response, we don't attempt to pass the socket on. */
2885 if (tls_out.active >= 0)
2887 tls_close(FALSE, TRUE);
2891 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2892 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2893 ob->command_timeout);
2897 /* If the socket is successfully passed, we musn't send QUIT (or
2898 indeed anything!) from here. */
2900 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2901 propagate it from the initial
2903 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2904 new_message_id, inblock.sock))
2910 /* If RSET failed and there are addresses left, they get deferred. */
2912 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2913 #ifdef EXPERIMENTAL_DSN_INFO
2914 , smtp_greeting, helo_response
2920 /* End off tidily with QUIT unless the connection has died or the socket has
2921 been passed to another process. There has been discussion on the net about what
2922 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2923 to wait for a response, but on the other hand, there isn't anything one can do
2924 with an error response, other than log it. Exim used to do that. However,
2925 further discussion suggested that it is positively advantageous not to wait for
2926 the response, but to close the session immediately. This is supposed to move
2927 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2928 load from the server. (Hosts that are both servers and clients may not see much
2929 difference, of course.) Further discussion indicated that this was safe to do
2930 on Unix systems which have decent implementations of TCP/IP that leave the
2931 connection around for a while (TIME_WAIT) after the application has gone away.
2932 This enables the response sent by the server to be properly ACKed rather than
2933 timed out, as can happen on broken TCP/IP implementations on other OS.
2935 This change is being made on 31-Jul-98. After over a year of trouble-free
2936 operation, the old commented-out code was removed on 17-Sep-99. */
2939 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2944 tls_close(FALSE, TRUE);
2947 /* Close the socket, and return the appropriate value, first setting
2948 works because the NULL setting is passed back to the calling process, and
2949 remote_max_parallel is forced to 1 when delivering over an existing connection,
2951 If all went well and continue_more is set, we shouldn't actually get here if
2952 there are further addresses, as the return above will be taken. However,
2953 writing RSET might have failed, or there may be other addresses whose hosts are
2954 specified in the transports, and therefore not visible at top level, in which
2955 case continue_more won't get set. */
2957 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2958 (void)close(inblock.sock);
2960 #ifndef DISABLE_EVENT
2961 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2964 continue_transport = NULL;
2965 continue_hostname = NULL;
2972 /*************************************************
2973 * Closedown entry point *
2974 *************************************************/
2976 /* This function is called when exim is passed an open smtp channel
2977 from another incarnation, but the message which it has been asked
2978 to deliver no longer exists. The channel is on stdin.
2980 We might do fancy things like looking for another message to send down
2981 the channel, but if the one we sought has gone, it has probably been
2982 delivered by some other process that itself will seek further messages,
2983 so just close down our connection.
2985 Argument: pointer to the transport instance block
2990 smtp_transport_closedown(transport_instance *tblock)
2992 smtp_transport_options_block *ob =
2993 (smtp_transport_options_block *)(tblock->options_block);
2994 smtp_inblock inblock;
2995 smtp_outblock outblock;
2997 uschar inbuffer[4096];
2998 uschar outbuffer[16];
3000 inblock.sock = fileno(stdin);
3001 inblock.buffer = inbuffer;
3002 inblock.buffersize = sizeof(inbuffer);
3003 inblock.ptr = inbuffer;
3004 inblock.ptrend = inbuffer;
3006 outblock.sock = inblock.sock;
3007 outblock.buffersize = sizeof(outbuffer);
3008 outblock.buffer = outbuffer;
3009 outblock.ptr = outbuffer;
3010 outblock.cmd_count = 0;
3011 outblock.authenticating = FALSE;
3013 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3014 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3015 ob->command_timeout);
3016 (void)close(inblock.sock);
3021 /*************************************************
3022 * Prepare addresses for delivery *
3023 *************************************************/
3025 /* This function is called to flush out error settings from previous delivery
3026 attempts to other hosts. It also records whether we got here via an MX record
3027 or not in the more_errno field of the address. We are interested only in
3028 addresses that are still marked DEFER - others may have got delivered to a
3029 previously considered IP address. Set their status to PENDING_DEFER to indicate
3030 which ones are relevant this time.
3033 addrlist the list of addresses
3034 host the host we are delivering to
3036 Returns: the first address for this delivery
3039 static address_item *
3040 prepare_addresses(address_item *addrlist, host_item *host)
3042 address_item *first_addr = NULL;
3044 for (addr = addrlist; addr != NULL; addr = addr->next)
3045 if (addr->transport_return == DEFER)
3047 if (first_addr == NULL) first_addr = addr;
3048 addr->transport_return = PENDING_DEFER;
3049 addr->basic_errno = 0;
3050 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3051 addr->message = NULL;
3053 addr->cipher = NULL;
3054 addr->ourcert = NULL;
3055 addr->peercert = NULL;
3056 addr->peerdn = NULL;
3057 addr->ocsp = OCSP_NOT_REQ;
3059 #ifdef EXPERIMENTAL_DSN_INFO
3060 addr->smtp_greeting = NULL;
3061 addr->helo_response = NULL;
3069 /*************************************************
3070 * Main entry point *
3071 *************************************************/
3073 /* See local README for interface details. As this is a remote transport, it is
3074 given a chain of addresses to be delivered in one connection, if possible. It
3075 always returns TRUE, indicating that each address has its own independent
3076 status set, except if there is a setting up problem, in which case it returns
3080 smtp_transport_entry(
3081 transport_instance *tblock, /* data for this instantiation */
3082 address_item *addrlist) /* addresses we are working on */
3086 int hosts_defer = 0;
3088 int hosts_looked_up = 0;
3089 int hosts_retry = 0;
3090 int hosts_serial = 0;
3091 int hosts_total = 0;
3092 int total_hosts_tried = 0;
3094 BOOL expired = TRUE;
3095 BOOL continuing = continue_hostname != NULL;
3096 uschar *expanded_hosts = NULL;
3098 uschar *tid = string_sprintf("%s transport", tblock->name);
3099 smtp_transport_options_block *ob =
3100 (smtp_transport_options_block *)(tblock->options_block);
3101 host_item *hostlist = addrlist->host_list;
3102 host_item *host = NULL;
3106 debug_printf("%s transport entered\n", tblock->name);
3107 for (addr = addrlist; addr != NULL; addr = addr->next)
3108 debug_printf(" %s\n", addr->address);
3109 if (continuing) debug_printf("already connected to %s [%s]\n",
3110 continue_hostname, continue_host_address);
3113 /* Set the flag requesting that these hosts be added to the waiting
3114 database if the delivery fails temporarily or if we are running with
3115 queue_smtp or a 2-stage queue run. This gets unset for certain
3116 kinds of error, typically those that are specific to the message. */
3118 update_waiting = TRUE;
3120 /* If a host list is not defined for the addresses - they must all have the
3121 same one in order to be passed to a single transport - or if the transport has
3122 a host list with hosts_override set, use the host list supplied with the
3123 transport. It is an error for this not to exist. */
3125 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3127 if (ob->hosts == NULL)
3129 addrlist->message = string_sprintf("%s transport called with no hosts set",
3131 addrlist->transport_return = PANIC;
3132 return FALSE; /* Only top address has status */
3135 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3138 /* If the transport's host list contains no '$' characters, and we are not
3139 randomizing, it is fixed and therefore a chain of hosts can be built once
3140 and for all, and remembered for subsequent use by other calls to this
3141 transport. If, on the other hand, the host list does contain '$', or we are
3142 randomizing its order, we have to rebuild it each time. In the fixed case,
3143 as the hosts string will never be used again, it doesn't matter that we
3144 replace all the : characters with zeros. */
3146 if (ob->hostlist == NULL)
3148 uschar *s = ob->hosts;
3150 if (Ustrchr(s, '$') != NULL)
3152 if (!(expanded_hosts = expand_string(s)))
3154 addrlist->message = string_sprintf("failed to expand list of hosts "
3155 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3156 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3157 return FALSE; /* Only top address has status */
3159 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3160 "\"%s\"\n", s, expanded_hosts);
3164 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3166 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3168 /* Check that the expansion yielded something useful. */
3169 if (hostlist == NULL)
3172 string_sprintf("%s transport has empty hosts setting", tblock->name);
3173 addrlist->transport_return = PANIC;
3174 return FALSE; /* Only top address has status */
3177 /* If there was no expansion of hosts, save the host list for
3180 if (!expanded_hosts) ob->hostlist = hostlist;
3183 /* This is not the first time this transport has been run in this delivery;
3184 the host list was built previously. */
3187 hostlist = ob->hostlist;
3190 /* The host list was supplied with the address. If hosts_randomize is set, we
3191 must sort it into a random order if it did not come from MX records and has not
3192 already been randomized (but don't bother if continuing down an existing
3195 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3197 host_item *newlist = NULL;
3198 while (hostlist != NULL)
3200 host_item *h = hostlist;
3201 hostlist = hostlist->next;
3203 h->sort_key = random_number(100);
3205 if (newlist == NULL)
3210 else if (h->sort_key < newlist->sort_key)
3217 host_item *hh = newlist;
3218 while (hh->next != NULL)
3220 if (h->sort_key < hh->next->sort_key) break;
3228 hostlist = addrlist->host_list = newlist;
3231 /* Sort out the default port. */
3233 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3235 /* For each host-plus-IP-address on the list:
3237 . If this is a continued delivery and the host isn't the one with the
3238 current connection, skip.
3240 . If the status is unusable (i.e. previously failed or retry checked), skip.
3242 . If no IP address set, get the address, either by turning the name into
3243 an address, calling gethostbyname if gethostbyname is on, or by calling
3244 the DNS. The DNS may yield multiple addresses, in which case insert the
3245 extra ones into the list.
3247 . Get the retry data if not previously obtained for this address and set the
3248 field which remembers the state of this address. Skip if the retry time is
3249 not reached. If not, remember whether retry data was found. The retry string
3250 contains both the name and the IP address.
3252 . Scan the list of addresses and mark those whose status is DEFER as
3253 PENDING_DEFER. These are the only ones that will be processed in this cycle
3256 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3257 Some addresses may be successfully delivered, others may fail, and yet
3258 others may get temporary errors and so get marked DEFER.
3260 . The return from the delivery attempt is OK if a connection was made and a
3261 valid SMTP dialogue was completed. Otherwise it is DEFER.
3263 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3265 . If fail to connect, or other defer state, add a retry item.
3267 . If there are any addresses whose status is still DEFER, carry on to the
3268 next host/IPaddress, unless we have tried the number of hosts given
3269 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3270 there is some fancy logic for hosts_max_try that means its limit can be
3271 overstepped in some circumstances.
3273 If we get to the end of the list, all hosts have deferred at least one address,
3274 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3275 delivery attempt to those hosts whose last try was before the arrival time of
3276 the current message. To cope with this, we have to go round the loop a second
3277 time. After that, set the status and error data for any addresses that haven't
3278 had it set already. */
3280 for (cutoff_retry = 0; expired &&
3281 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3284 host_item *nexthost = NULL;
3285 int unexpired_hosts_tried = 0;
3287 for (host = hostlist;
3289 unexpired_hosts_tried < ob->hosts_max_try &&
3290 total_hosts_tried < ob->hosts_max_try_hardlimit;
3296 BOOL serialized = FALSE;
3297 BOOL host_is_expired = FALSE;
3298 BOOL message_defer = FALSE;
3299 BOOL some_deferred = FALSE;
3300 address_item *first_addr = NULL;
3301 uschar *interface = NULL;
3302 uschar *retry_host_key = NULL;
3303 uschar *retry_message_key = NULL;
3304 uschar *serialize_key = NULL;
3306 /* Default next host is next host. :-) But this can vary if the
3307 hosts_max_try limit is hit (see below). It may also be reset if a host
3308 address is looked up here (in case the host was multihomed). */
3310 nexthost = host->next;
3312 /* If the address hasn't yet been obtained from the host name, look it up
3313 now, unless the host is already marked as unusable. If it is marked as
3314 unusable, it means that the router was unable to find its IP address (in
3315 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3316 the lookup failed last time. We don't get this far if *all* MX records
3317 point to non-existent hosts; that is treated as a hard error.
3319 We can just skip this host entirely. When the hosts came from the router,
3320 the address will timeout based on the other host(s); when the address is
3321 looked up below, there is an explicit retry record added.
3323 Note that we mustn't skip unusable hosts if the address is not unset; they
3324 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3326 if (host->address == NULL)
3328 int new_port, flags;
3331 if (host->status >= hstatus_unusable)
3333 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3338 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3340 /* The host name is permitted to have an attached port. Find it, and
3341 strip it from the name. Just remember it for now. */
3343 new_port = host_item_get_port(host);
3345 /* Count hosts looked up */
3349 /* Find by name if so configured, or if it's an IP address. We don't
3350 just copy the IP address, because we need the test-for-local to happen. */
3352 flags = HOST_FIND_BY_A;
3353 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3354 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3356 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3357 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3359 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3360 &ob->dnssec, /* domains for request/require */
3363 /* Update the host (and any additional blocks, resulting from
3364 multihoming) with a host-specific port, if any. */
3366 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3368 /* Failure to find the host at this time (usually DNS temporary failure)
3369 is really a kind of routing failure rather than a transport failure.
3370 Therefore we add a retry item of the routing kind, not to stop us trying
3371 to look this name up here again, but to ensure the address gets timed
3372 out if the failures go on long enough. A complete failure at this point
3373 commonly points to a configuration error, but the best action is still
3374 to carry on for the next host. */
3376 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3378 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3380 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3381 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3382 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3383 host->status = hstatus_unusable;
3385 for (addr = addrlist; addr != NULL; addr = addr->next)
3387 if (addr->transport_return != DEFER) continue;
3388 addr->basic_errno = ERRNO_UNKNOWNHOST;
3390 string_sprintf("failed to lookup IP address for %s", host->name);
3395 /* If the host is actually the local host, we may have a problem, or
3396 there may be some cunning configuration going on. In the problem case,
3397 log things and give up. The default transport status is already DEFER. */
3399 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3401 for (addr = addrlist; addr != NULL; addr = addr->next)
3403 addr->basic_errno = 0;
3404 addr->message = string_sprintf("%s transport found host %s to be "
3405 "local", tblock->name, host->name);
3409 } /* End of block for IP address lookup */
3411 /* If this is a continued delivery, we are interested only in the host
3412 which matches the name of the existing open channel. The check is put
3413 here after the local host lookup, in case the name gets expanded as a
3414 result of the lookup. Set expired FALSE, to save the outer loop executing
3417 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3418 Ustrcmp(continue_host_address, host->address) != 0))
3421 continue; /* With next host */
3424 /* Reset the default next host in case a multihomed host whose addresses
3425 are not looked up till just above added to the host list. */
3427 nexthost = host->next;
3429 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3430 domain is in queue_smtp_domains, we don't actually want to attempt any
3431 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3432 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3433 were not in it. We don't want to hold up all SMTP deliveries! Except when
3434 doing a two-stage queue run, don't do this if forcing. */
3436 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3437 match_isinlist(addrlist->domain,
3438 (const uschar **)&queue_smtp_domains, 0,
3439 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3442 for (addr = addrlist; addr != NULL; addr = addr->next)
3444 if (addr->transport_return != DEFER) continue;
3445 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3447 continue; /* With next host */
3450 /* Count hosts being considered - purely for an intelligent comment
3451 if none are usable. */
3455 /* Set $host and $host address now in case they are needed for the
3456 interface expansion or the serialize_hosts check; they remain set if an
3457 actual delivery happens. */
3459 deliver_host = host->name;
3460 deliver_host_address = host->address;
3461 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3462 : host->dnssec == DS_NO ? US"no"
3465 /* Set up a string for adding to the retry key if the port number is not
3466 the standard SMTP port. A host may have its own port setting that overrides
3469 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3471 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3473 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3474 string is set, even if constant (as different transports can have different
3475 constant settings), we must add it to the key that is used for retries,
3476 because connections to the same host from a different interface should be
3477 treated separately. */
3479 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3480 if ((rs = ob->interface) && *rs)
3482 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3484 pistring = string_sprintf("%s/%s", pistring, interface);
3487 /* The first time round the outer loop, check the status of the host by
3488 inspecting the retry data. The second time round, we are interested only
3489 in expired hosts that haven't been tried since this message arrived. */
3491 if (cutoff_retry == 0)
3494 /* Ensure the status of the address is set by checking retry data if
3495 necessary. There may be host-specific retry data (applicable to all
3496 messages) and also data for retries of a specific message at this host.
3497 If either of these retry records are actually read, the keys used are
3498 returned to save recomputing them later. */
3500 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3501 US"retry_include_ip_address", ob->retry_include_ip_address,
3502 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3503 continue; /* with next host */
3505 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3506 incl_ip, &retry_host_key, &retry_message_key);
3508 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3509 (host->address == NULL)? US"" : host->address, pistring,
3510 (host->status == hstatus_usable)? "usable" :
3511 (host->status == hstatus_unusable)? "unusable" :
3512 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3514 /* Skip this address if not usable at this time, noting if it wasn't
3515 actually expired, both locally and in the address. */
3517 switch (host->status)
3519 case hstatus_unusable:
3521 setflag(addrlist, af_retry_skipped);
3524 case hstatus_unusable_expired:
3527 case hwhy_retry: hosts_retry++; break;
3528 case hwhy_failed: hosts_fail++; break;
3529 case hwhy_deferred: hosts_defer++; break;
3532 /* If there was a retry message key, implying that previously there
3533 was a message-specific defer, we don't want to update the list of
3534 messages waiting for these hosts. */
3536 if (retry_message_key != NULL) update_waiting = FALSE;
3537 continue; /* With the next host or IP address */
3541 /* Second time round the loop: if the address is set but expired, and
3542 the message is newer than the last try, let it through. */
3546 if (host->address == NULL ||
3547 host->status != hstatus_unusable_expired ||
3548 host->last_try > received_time)
3551 debug_printf("trying expired host %s [%s]%s\n",
3552 host->name, host->address, pistring);
3553 host_is_expired = TRUE;
3556 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3557 it remains TRUE only if all hosts are expired and none are actually tried.
3562 /* If this host is listed as one to which access must be serialized,
3563 see if another Exim process has a connection to it, and if so, skip
3564 this host. If not, update the database to record our connection to it
3565 and remember this for later deletion. Do not do any of this if we are
3566 sending the message down a pre-existing connection. */
3569 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3571 serialize_key = string_sprintf("host-serialize-%s", host->name);
3572 if (!enq_start(serialize_key, 1))
3575 debug_printf("skipping host %s because another Exim process "
3576 "is connected to it\n", host->name);
3583 /* OK, we have an IP address that is not waiting for its retry time to
3584 arrive (it might be expired) OR (second time round the loop) we have an
3585 expired host that hasn't been tried since the message arrived. Have a go
3586 at delivering the message to it. First prepare the addresses by flushing
3587 out the result of previous attempts, and finding the first address that
3588 is still to be delivered. */
3590 first_addr = prepare_addresses(addrlist, host);
3592 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3593 message_id, host->name, host->address, addrlist->address,
3594 (addrlist->next == NULL)? "" : ", ...");
3596 set_process_info("delivering %s to %s [%s] (%s%s)",
3597 message_id, host->name, host->address, addrlist->address,
3598 (addrlist->next == NULL)? "" : ", ...");
3600 /* This is not for real; don't do the delivery. If there are
3601 any remaining hosts, list them. */
3606 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3607 for (addr = addrlist; addr != NULL; addr = addr->next)
3609 addr->host_used = host;
3610 addr->special_action = '*';
3611 addr->message = US"delivery bypassed by -N option";
3615 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3616 "*** host and remaining hosts:\n", tblock->name);
3617 for (host2 = host; host2 != NULL; host2 = host2->next)
3618 debug_printf(" %s [%s]\n", host2->name,
3619 (host2->address == NULL)? US"unset" : host2->address);
3624 /* This is for real. If the host is expired, we don't count it for
3625 hosts_max_retry. This ensures that all hosts must expire before an address
3626 is timed out, unless hosts_max_try_hardlimit (which protects against
3627 lunatic DNS configurations) is reached.
3629 If the host is not expired and we are about to hit the hosts_max_retry
3630 limit, check to see if there is a subsequent hosts with a different MX
3631 value. If so, make that the next host, and don't count this one. This is a
3632 heuristic to make sure that different MXs do get tried. With a normal kind
3633 of retry rule, they would get tried anyway when the earlier hosts were
3634 delayed, but if the domain has a "retry every time" type of rule - as is
3635 often used for the the very large ISPs, that won't happen. */
3640 /* Make a copy of the host if it is local to this invocation
3641 of the transport. */
3645 thost = store_get(sizeof(host_item));
3647 thost->name = string_copy(host->name);
3648 thost->address = string_copy(host->address);
3653 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3657 debug_printf("hosts_max_try limit reached with this host\n");
3658 for (h = host; h; h = h->next) if (h->mx != host->mx)
3661 unexpired_hosts_tried--;
3662 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3663 "and will be tried\n");
3668 /* Attempt the delivery. */
3670 total_hosts_tried++;
3671 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3672 &message_defer, FALSE);
3675 OK => connection made, each address contains its result;
3676 message_defer is set for message-specific defers (when all
3677 recipients are marked defer)
3678 DEFER => there was a non-message-specific delivery problem;
3679 ERROR => there was a problem setting up the arguments for a filter,
3680 or there was a problem with expanding added headers
3683 /* If the result is not OK, there was a non-message-specific problem.
3684 If the result is DEFER, we need to write to the logs saying what happened
3685 for this particular host, except in the case of authentication and TLS
3686 failures, where the log has already been written. If all hosts defer a
3687 general message is written at the end. */
3689 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3690 first_addr->basic_errno != ERRNO_TLSFAILURE)
3691 write_logs(first_addr, host);
3693 #ifndef DISABLE_EVENT
3695 deferred_event_raise(first_addr, host);
3698 /* If STARTTLS was accepted, but there was a failure in setting up the
3699 TLS session (usually a certificate screwup), and the host is not in
3700 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3701 TLS forcibly turned off. We have to start from scratch with a new SMTP
3702 connection. That's why the retry is done from here, not from within
3703 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3704 session, so the in-clear transmission after those errors, if permitted,
3705 happens inside smtp_deliver().] */
3709 && first_addr->basic_errno == ERRNO_TLSFAILURE
3710 && ob->tls_tempfail_tryclear
3711 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3714 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3715 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3716 first_addr = prepare_addresses(addrlist, host);
3717 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3718 &message_defer, TRUE);
3719 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3720 write_logs(first_addr, host);
3721 # ifndef DISABLE_EVENT
3723 deferred_event_raise(first_addr, host);
3726 #endif /*SUPPORT_TLS*/
3729 /* Delivery attempt finished */
3731 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3734 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3735 message_id, host->name, host->address, addrlist->address,
3736 (addrlist->next == NULL)? "" : " (& others)", rs);
3738 /* Release serialization if set up */
3740 if (serialized) enq_end(serialize_key);
3742 /* If the result is DEFER, or if a host retry record is known to exist, we
3743 need to add an item to the retry chain for updating the retry database
3744 at the end of delivery. We only need to add the item to the top address,
3745 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3746 for any other delivery attempts using the same address. (It is copied into
3747 the unusable tree at the outer level, so even if different address blocks
3748 contain the same address, it still won't get tried again.) */
3750 if (rc == DEFER || retry_host_key != NULL)
3752 int delete_flag = (rc != DEFER)? rf_delete : 0;
3753 if (retry_host_key == NULL)
3756 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3757 US"retry_include_ip_address", ob->retry_include_ip_address,
3758 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3759 incl_ip = TRUE; /* error; use most-specific retry record */
3761 retry_host_key = incl_ip ?
3762 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3763 string_sprintf("T:%S%s", host->name, pistring);
3766 /* If a delivery of another message over an existing SMTP connection
3767 yields DEFER, we do NOT set up retry data for the host. This covers the
3768 case when there are delays in routing the addresses in the second message
3769 that are so long that the server times out. This is alleviated by not
3770 routing addresses that previously had routing defers when handling an
3771 existing connection, but even so, this case may occur (e.g. if a
3772 previously happily routed address starts giving routing defers). If the
3773 host is genuinely down, another non-continued message delivery will
3774 notice it soon enough. */
3776 if (delete_flag != 0 || !continuing)
3777 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3779 /* We may have tried an expired host, if its retry time has come; ensure
3780 the status reflects the expiry for the benefit of any other addresses. */
3784 host->status = (host_is_expired)?
3785 hstatus_unusable_expired : hstatus_unusable;
3786 host->why = hwhy_deferred;
3790 /* If message_defer is set (host was OK, but every recipient got deferred
3791 because of some message-specific problem), or if that had happened
3792 previously so that a message retry key exists, add an appropriate item
3793 to the retry chain. Note that if there was a message defer but now there is
3794 a host defer, the message defer record gets deleted. That seems perfectly
3795 reasonable. Also, stop the message from being remembered as waiting
3796 for specific hosts. */
3798 if (message_defer || retry_message_key != NULL)
3800 int delete_flag = message_defer? 0 : rf_delete;
3801 if (retry_message_key == NULL)
3804 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3805 US"retry_include_ip_address", ob->retry_include_ip_address,
3806 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3807 incl_ip = TRUE; /* error; use most-specific retry record */
3809 retry_message_key = incl_ip ?
3810 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3812 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3814 retry_add_item(addrlist, retry_message_key,
3815 rf_message | rf_host | delete_flag);
3816 update_waiting = FALSE;
3819 /* Any return other than DEFER (that is, OK or ERROR) means that the
3820 addresses have got their final statuses filled in for this host. In the OK
3821 case, see if any of them are deferred. */
3824 for (addr = addrlist; addr; addr = addr->next)
3825 if (addr->transport_return == DEFER)
3827 some_deferred = TRUE;
3831 /* If no addresses deferred or the result was ERROR, return. We do this for
3832 ERROR because a failing filter set-up or add_headers expansion is likely to
3833 fail for any host we try. */
3835 if (rc == ERROR || (rc == OK && !some_deferred))
3837 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3838 return TRUE; /* Each address has its status */
3841 /* If the result was DEFER or some individual addresses deferred, let
3842 the loop run to try other hosts with the deferred addresses, except for the
3843 case when we were trying to deliver down an existing channel and failed.
3844 Don't try any other hosts in this case. */
3846 if (continuing) break;
3848 /* If the whole delivery, or some individual addresses, were deferred and
3849 there are more hosts that could be tried, do not count this host towards
3850 the hosts_max_try limit if the age of the message is greater than the
3851 maximum retry time for this host. This means we may try try all hosts,
3852 ignoring the limit, when messages have been around for some time. This is
3853 important because if we don't try all hosts, the address will never time
3854 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3856 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3859 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3861 if (retry != NULL && retry->rules != NULL)
3863 retry_rule *last_rule;
3864 for (last_rule = retry->rules;
3865 last_rule->next != NULL;
3866 last_rule = last_rule->next);
3867 timedout = time(NULL) - received_time > last_rule->timeout;
3869 else timedout = TRUE; /* No rule => timed out */
3873 unexpired_hosts_tried--;
3874 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3875 "hosts_max_try (message older than host's retry time)\n");
3878 } /* End of loop for trying multiple hosts. */
3880 /* This is the end of the loop that repeats iff expired is TRUE and
3881 ob->delay_after_cutoff is FALSE. The second time round we will
3882 try those hosts that haven't been tried since the message arrived. */
3886 debug_printf("all IP addresses skipped or deferred at least one address\n");
3887 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3888 debug_printf("retrying IP addresses not tried since message arrived\n");
3893 /* Get here if all IP addresses are skipped or defer at least one address. In
3894 MUA wrapper mode, this will happen only for connection or other non-message-
3895 specific failures. Force the delivery status for all addresses to FAIL. */
3899 for (addr = addrlist; addr != NULL; addr = addr->next)
3900 addr->transport_return = FAIL;
3904 /* In the normal, non-wrapper case, add a standard message to each deferred
3905 address if there hasn't been an error, that is, if it hasn't actually been
3906 tried this time. The variable "expired" will be FALSE if any deliveries were
3907 actually tried, or if there was at least one host that was not expired. That
3908 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3909 a delivery has been tried, an error code will be set, and the failing of the
3910 message is handled by the retry code later.
3912 If queue_smtp is set, or this transport was called to send a subsequent message
3913 down an existing TCP/IP connection, and something caused the host not to be
3914 found, we end up here, but can detect these cases and handle them specially. */
3916 for (addr = addrlist; addr != NULL; addr = addr->next)
3918 /* If host is not NULL, it means that we stopped processing the host list
3919 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3920 means we need to behave as if some hosts were skipped because their retry
3921 time had not come. Specifically, this prevents the address from timing out.
3922 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3923 hosts were tried. */
3927 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3930 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3931 "hosts were tried\n");
3936 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3937 setflag(addr, af_retry_skipped);
3941 if (queue_smtp) /* no deliveries attempted */
3943 addr->transport_return = DEFER;
3944 addr->basic_errno = 0;
3945 addr->message = US"SMTP delivery explicitly queued";
3948 else if (addr->transport_return == DEFER &&
3949 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3950 addr->message == NULL)
3952 addr->basic_errno = ERRNO_HRETRY;
3953 if (continue_hostname != NULL)
3955 addr->message = US"no host found for existing SMTP connection";
3959 setflag(addr, af_pass_message); /* This is not a security risk */
3960 addr->message = ob->delay_after_cutoff
3961 ? US"retry time not reached for any host after a long failure period"
3962 : US"all hosts have been failing for a long time and were last tried "
3963 "after this message arrived";
3965 /* If we are already using fallback hosts, or there are no fallback hosts
3966 defined, convert the result to FAIL to cause a bounce. */
3968 if (addr->host_list == addr->fallback_hosts ||
3969 addr->fallback_hosts == NULL)
3970 addr->transport_return = FAIL;
3975 if (hosts_retry == hosts_total)
3976 s = "retry time not reached for any host%s";
3977 else if (hosts_fail == hosts_total)
3978 s = "all host address lookups%s failed permanently";
3979 else if (hosts_defer == hosts_total)
3980 s = "all host address lookups%s failed temporarily";
3981 else if (hosts_serial == hosts_total)
3982 s = "connection limit reached for all hosts%s";
3983 else if (hosts_fail+hosts_defer == hosts_total)
3984 s = "all host address lookups%s failed";
3986 s = "some host address lookups failed and retry time "
3987 "not reached for other hosts or connection limit reached%s";
3989 addr->message = string_sprintf(s,
3990 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3995 /* Update the database which keeps information about which messages are waiting
3996 for which hosts to become available. For some message-specific errors, the
3997 update_waiting flag is turned off because we don't want follow-on deliveries in
3998 those cases. If this transport instance is explicitly limited to one message
3999 per connection then follow-on deliveries are not possible and there's no need
4000 to create/update the per-transport wait-<transport_name> database. */
4002 if (update_waiting && tblock->connection_max_messages != 1)
4003 transport_update_waiting(hostlist, tblock->name);
4007 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4009 return TRUE; /* Each address has its status */
4014 /* End of transport/smtp.c */