1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
163 ,{ "tls_certificate", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
165 { "tls_crl", opt_stringptr,
166 (void *)offsetof(smtp_transport_options_block, tls_crl) },
167 { "tls_dh_min_bits", opt_int,
168 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
169 { "tls_privatekey", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
171 { "tls_require_ciphers", opt_stringptr,
172 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
173 { "tls_sni", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_sni) },
175 { "tls_tempfail_tryclear", opt_bool,
176 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
177 { "tls_try_verify_hosts", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
179 #ifdef EXPERIMENTAL_CERTNAMES
180 { "tls_verify_cert_hostnames", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
183 { "tls_verify_certificates", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
185 { "tls_verify_hosts", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
190 /* Size of the options list. An extern variable has to be used so that its
191 address can appear in the tables drtables.c. */
193 int smtp_transport_options_count =
194 sizeof(smtp_transport_options)/sizeof(optionlist);
196 /* Default private options block for the smtp transport. */
198 smtp_transport_options_block smtp_transport_option_defaults = {
200 NULL, /* fallback_hosts */
202 NULL, /* fallback_hostlist */
203 NULL, /* authenticated_sender */
204 US"$primary_hostname", /* helo_data */
205 NULL, /* interface */
207 US"smtp", /* protocol */
209 NULL, /* serialize_hosts */
210 NULL, /* hosts_try_auth */
211 NULL, /* hosts_require_auth */
212 #ifdef EXPERIMENTAL_DANE
213 NULL, /* hosts_try_dane */
214 NULL, /* hosts_require_dane */
217 NULL, /* hosts_try_prdr */
220 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
221 NULL, /* hosts_require_ocsp */
223 NULL, /* hosts_require_tls */
224 NULL, /* hosts_avoid_tls */
225 US"*", /* hosts_verify_avoid_tls */
226 NULL, /* hosts_avoid_pipelining */
227 NULL, /* hosts_avoid_esmtp */
228 NULL, /* hosts_nopass_tls */
229 5*60, /* command_timeout */
230 5*60, /* connect_timeout; shorter system default overrides */
231 5*60, /* data timeout */
232 10*60, /* final timeout */
233 1024, /* size_addition */
234 5, /* hosts_max_try */
235 50, /* hosts_max_try_hardlimit */
236 TRUE, /* address_retry_include_sender */
237 FALSE, /* allow_localhost */
238 FALSE, /* authenticated_sender_force */
239 FALSE, /* gethostbyname */
240 TRUE, /* dns_qualify_single */
241 FALSE, /* dns_search_parents */
242 NULL, /* dnssec_request_domains */
243 NULL, /* dnssec_require_domains */
244 TRUE, /* delay_after_cutoff */
245 FALSE, /* hosts_override */
246 FALSE, /* hosts_randomize */
247 TRUE, /* keepalive */
248 FALSE, /* lmtp_ignore_quota */
249 NULL, /* expand_retry_include_ip_address */
250 TRUE /* retry_include_ip_address */
252 ,NULL, /* tls_certificate */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
256 NULL, /* gnutls_require_kx */
257 NULL, /* gnutls_require_mac */
258 NULL, /* gnutls_require_proto */
260 NULL, /* tls_verify_certificates */
261 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
262 /* tls_dh_min_bits */
263 TRUE, /* tls_tempfail_tryclear */
264 NULL, /* tls_verify_hosts */
265 NULL /* tls_try_verify_hosts */
266 # ifdef EXPERIMENTAL_CERTNAMES
267 ,NULL /* tls_verify_cert_hostnames */
271 ,NULL, /* dkim_canon */
272 NULL, /* dkim_domain */
273 NULL, /* dkim_private_key */
274 NULL, /* dkim_selector */
275 NULL, /* dkim_sign_headers */
276 NULL /* dkim_strict */
280 #ifdef EXPERIMENTAL_DSN
281 /* some DSN flags for use later */
283 static int rf_list[] = {rf_notify_never, rf_notify_success,
284 rf_notify_failure, rf_notify_delay };
286 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
317 Returns: OK always (FAIL, DEFER not used)
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
327 errmsg = errmsg; /* Keep picky compilers happy */
331 /* Pass back options if required. This interface is getting very messy. */
335 tf->interface = ob->interface;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
351 if (!testflag(addrlist, af_local_host_removed))
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
371 Argument: pointer to the transport instance block
376 smtp_transport_init(transport_instance *tblock)
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
381 /* Retry_use_local_part defaults FALSE if unset */
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
386 /* Set the default port according to the protocol */
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392 /* Set up the setup entry point, to be called before subprocesses for this
395 tblock->setup = smtp_transport_setup;
397 /* Complain if any of the timeouts are zero. */
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
444 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446 this particular type of timeout.
452 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
453 BOOL pass_message, host_item * host)
457 if (errno_value == ERRNO_CONNECTTIMEOUT)
459 errno_value = ETIMEDOUT;
460 orvalue = RTEF_CTOUT;
462 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return < PENDING) continue;
465 addr->basic_errno = errno_value;
466 addr->more_errno |= orvalue;
470 if (pass_message) setflag(addr, af_pass_message);
472 addr->transport_return = rc;
474 addr->host_used = host;
480 /*************************************************
481 * Check an SMTP response *
482 *************************************************/
484 /* This function is given an errno code and the SMTP response buffer
485 to analyse, together with the host identification for generating messages. It
486 sets an appropriate message and puts the first digit of the response code into
487 the yield variable. If no response was actually read, a suitable digit is
491 host the current host, to get its name for messages
492 errno_value pointer to the errno value
493 more_errno from the top address for use with ERRNO_FILTER_FAIL
494 buffer the SMTP response buffer
495 yield where to put a one-digit SMTP response code
496 message where to put an errror message
497 pass_message set TRUE if message is an SMTP response
499 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
503 check_response(host_item *host, int *errno_value, int more_errno,
504 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
508 if (smtp_use_pipelining &&
509 (Ustrcmp(smtp_command, "MAIL") == 0 ||
510 Ustrcmp(smtp_command, "RCPT") == 0 ||
511 Ustrcmp(smtp_command, "DATA") == 0))
514 *yield = '4'; /* Default setting is to give a temporary error */
516 /* Handle response timeout */
518 if (*errno_value == ETIMEDOUT)
520 *message = US string_sprintf("SMTP timeout after %s%s",
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
528 /* Handle malformed SMTP response */
530 if (*errno_value == ERRNO_SMTPFORMAT)
532 uschar *malfresp = string_printing(buffer);
533 while (isspace(*malfresp)) malfresp++;
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
542 /* Handle a failed filter process error; can't send QUIT as we mustn't
545 if (*errno_value == ERRNO_FILTER_FAIL)
547 *message = US string_sprintf("transport filter process failed (%d)%s",
549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
553 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
556 if (*errno_value == ERRNO_CHHEADER_FAIL)
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
564 /* Handle failure to write a complete data block */
566 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 *message = US string_sprintf("failed to write a data block");
572 /* Handle error responses from the remote mailer. */
576 uschar *s = string_printing(buffer);
577 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
578 "%s", pl, smtp_command, s);
579 *pass_message = TRUE;
584 /* No data was read. If there is no errno, this must be the EOF (i.e.
585 connection closed) case, which causes deferral. An explicit connection reset
586 error has the same effect. Otherwise, put the host's identity in the message,
587 leaving the errno value to be interpreted as well. In all cases, we have to
588 assume the connection is now dead. */
590 if (*errno_value == 0 || *errno_value == ECONNRESET)
592 *errno_value = ERRNO_SMTPCLOSED;
593 *message = US string_sprintf("Remote host closed connection "
594 "in response to %s%s", pl, smtp_command);
596 else *message = US string_sprintf("%s [%s]", host->name, host->address);
603 /*************************************************
604 * Write error message to logs *
605 *************************************************/
607 /* This writes to the main log and to the message log.
610 addr the address item containing error information
611 host the current host
617 write_logs(address_item *addr, host_item *host)
619 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
623 message = string_sprintf("%s: %s", message, addr->message);
624 if (addr->basic_errno > 0)
625 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
626 log_write(0, LOG_MAIN, "%s", message);
627 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
631 if (log_extra_selector & LX_outgoing_port)
632 message = string_sprintf("%s:%d", message,
633 host->port == PORT_NONE ? 25 : host->port);
634 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
635 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
636 strerror(addr->basic_errno));
641 msglog_line(host_item * host, uschar * message)
643 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
644 host->name, host->address, message);
649 #ifdef EXPERIMENTAL_EVENT
650 /*************************************************
651 * Post-defer action *
652 *************************************************/
654 /* This expands an arbitrary per-transport string.
655 It might, for example, be used to write to the database log.
658 addr the address item containing error information
659 host the current host
665 deferred_event_raise(address_item *addr, host_item *host)
667 uschar * action = addr->transport->event_action;
668 uschar * save_domain;
674 save_domain = deliver_domain;
675 save_local = deliver_localpart;
677 /*XXX would ip & port already be set up? */
678 deliver_host_address = string_copy(host->address);
679 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
680 event_defer_errno = addr->basic_errno;
682 router_name = addr->router->name;
683 transport_name = addr->transport->name;
684 deliver_domain = addr->domain;
685 deliver_localpart = addr->local_part;
687 (void) event_raise(action, US"msg:host:defer",
689 ? addr->basic_errno > 0
690 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
691 : string_copy(addr->message)
692 : addr->basic_errno > 0
693 ? string_copy(US strerror(addr->basic_errno))
696 deliver_localpart = save_local;
697 deliver_domain = save_domain;
698 router_name = transport_name = NULL;
704 /*************************************************
705 * Synchronize SMTP responses *
706 *************************************************/
708 /* This function is called from smtp_deliver() to receive SMTP responses from
709 the server, and match them up with the commands to which they relate. When
710 PIPELINING is not in use, this function is called after every command, and is
711 therefore somewhat over-engineered, but it is simpler to use a single scheme
712 that works both with and without PIPELINING instead of having two separate sets
715 The set of commands that are buffered up with pipelining may start with MAIL
716 and may end with DATA; in between are RCPT commands that correspond to the
717 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
718 etc.) are never buffered.
720 Errors after MAIL or DATA abort the whole process leaving the response in the
721 buffer. After MAIL, pending responses are flushed, and the original command is
722 re-instated in big_buffer for error messages. For RCPT commands, the remote is
723 permitted to reject some recipient addresses while accepting others. However
724 certain errors clearly abort the whole process. Set the value in
725 transport_return to PENDING_OK if the address is accepted. If there is a
726 subsequent general error, it will get reset accordingly. If not, it will get
727 converted to OK at the end.
730 addrlist the complete address list
731 include_affixes TRUE if affixes include in RCPT
732 sync_addr ptr to the ptr of the one to start scanning at (updated)
733 host the host we are connected to
734 count the number of responses to read
736 include_sender true if 4xx retry is to include the sender it its key
737 pending_MAIL true if the first response is for MAIL
738 pending_DATA 0 if last command sent was not DATA
739 +1 if previously had a good recipient
740 -1 if not previously had a good recipient
741 inblock incoming SMTP block
742 timeout timeout value
743 buffer buffer for reading response
744 buffsize size of buffer
746 Returns: 3 if at least one address had 2xx and one had 5xx
747 2 if at least one address had 5xx but none had 2xx
748 1 if at least one host had a 2xx response, but none had 5xx
749 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
750 -1 timeout while reading RCPT response
751 -2 I/O or other non-response error for RCPT
752 -3 DATA or MAIL failed - errno and buffer set
756 sync_responses(address_item *addrlist, BOOL include_affixes,
757 address_item **sync_addr, host_item *host, int count,
758 BOOL address_retry_include_sender, BOOL pending_MAIL,
759 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
762 address_item *addr = *sync_addr;
765 /* Handle the response for a MAIL command. On error, reinstate the original
766 command in big_buffer for error message use, and flush any further pending
767 responses before returning, except after I/O errors and timeouts. */
772 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
774 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
775 if (errno == 0 && buffer[0] != 0)
777 uschar flushbuffer[4096];
779 if (buffer[0] == '4')
781 save_errno = ERRNO_MAIL4XX;
782 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
786 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
788 && (errno != 0 || flushbuffer[0] == 0))
794 if (pending_DATA) count--; /* Number of RCPT responses to come */
795 while (count-- > 0) /* Mark any pending addrs with the host used */
797 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
798 addr->host_used = host;
805 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 /* Read and handle the required number of RCPT responses, matching each one up
808 with an address by scanning for the next address whose status is PENDING_DEFER.
813 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
815 /* The address was accepted */
816 addr->host_used = host;
818 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
821 addr->transport_return = PENDING_OK;
823 /* If af_dr_retry_exists is set, there was a routing delay on this address;
824 ensure that any address-specific retry record is expunged. We do this both
825 for the basic key and for the version that also includes the sender. */
827 if (testflag(addr, af_dr_retry_exists))
829 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
831 retry_add_item(addr, altkey, rf_delete);
832 retry_add_item(addr, addr->address_retry_key, rf_delete);
836 /* Timeout while reading the response */
838 else if (errno == ETIMEDOUT)
840 int save_errno = errno;
841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
842 transport_rcpt_address(addr, include_affixes));
843 set_errno(addrlist, save_errno, message, DEFER, FALSE, NULL);
844 retry_add_item(addr, addr->address_retry_key, 0);
845 update_waiting = FALSE;
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
854 else if (errno != 0 || buffer[0] == 0)
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, include_affixes));
861 /* Handle SMTP permanent and temporary response codes. */
866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
867 "%s", transport_rcpt_address(addr, include_affixes),
868 string_printing(buffer));
869 setflag(addr, af_pass_message);
870 msglog_line(host, addr->message);
872 /* The response was 5xx */
874 if (buffer[0] == '5')
876 addr->transport_return = FAIL;
880 /* The response was 4xx */
884 addr->transport_return = DEFER;
885 addr->basic_errno = ERRNO_RCPT4XX;
886 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
888 /* Log temporary errors if there are more hosts to be tried.
889 If not, log this last one in the == line. */
892 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
897 update_waiting = FALSE;
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
903 if (address_retry_include_sender)
905 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
907 retry_add_item(addr, altkey, 0);
909 else retry_add_item(addr, addr->address_retry_key, 0);
912 } /* Loop for next RCPT response */
914 /* Update where to start at for the next block of responses, unless we
915 have already handled all the addresses. */
917 if (addr != NULL) *sync_addr = addr->next;
919 /* Handle a response to DATA. If we have not had any good recipients, either
920 previously or in this block, the response is ignored. */
922 if (pending_DATA != 0 &&
923 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
928 if (pending_DATA > 0 || (yield & 1) != 0)
930 if (errno == 0 && buffer[0] == '4')
932 errno = ERRNO_DATA4XX;
933 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
937 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
942 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943 present) received 3xx. If any RCPTs were handled and yielded anything other
944 than 4xx, yield will be set non-zero. */
951 /* Do the client side of smtp-level authentication */
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
958 ibp, obp comms channel control blocks
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
965 FAIL_SEND Failed communications - transmit
970 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
975 uschar *fail_reason = US"server did not advertise AUTH support";
977 smtp_authenticated = FALSE;
978 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
979 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
980 host->name, host->address, NULL);
982 if (is_esmtp && !regex_AUTH) regex_AUTH =
983 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
986 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
988 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
989 expand_nmax = -1; /* reset */
991 /* Must not do this check until after we have saved the result of the
992 regex match above. */
994 if (require_auth == OK ||
995 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
996 host->address, NULL) == OK)
999 fail_reason = US"no common mechanisms were found";
1001 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1003 /* Scan the configured authenticators looking for one which is configured
1004 for use as a client, which is not suppressed by client_condition, and
1005 whose name matches an authentication mechanism supported by the server.
1006 If one is found, attempt to authenticate by calling its client function.
1009 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1013 (au->client_condition != NULL &&
1014 !expand_check_condition(au->client_condition, au->name,
1015 US"client authenticator")))
1017 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1019 (au->client)? "client_condition is false" :
1020 "not configured as a client");
1024 /* Loop to scan supported server mechanisms */
1029 int len = Ustrlen(au->public_name);
1030 while (isspace(*p)) p++;
1032 if (strncmpic(au->public_name, p, len) != 0 ||
1033 (p[len] != 0 && !isspace(p[len])))
1035 while (*p != 0 && !isspace(*p)) p++;
1039 /* Found data for a listed mechanism. Call its client entry. Set
1040 a flag in the outblock so that data is overwritten after sending so
1041 that reflections don't show it. */
1043 fail_reason = US"authentication attempt(s) failed";
1044 obp->authenticating = TRUE;
1045 rc = (au->info->clientcode)(au, ibp, obp,
1046 ob->command_timeout, buffer, bufsize);
1047 obp->authenticating = FALSE;
1048 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1051 /* A temporary authentication failure must hold up delivery to
1052 this host. After a permanent authentication failure, we carry on
1053 to try other authentication methods. If all fail hard, try to
1054 deliver the message unauthenticated unless require_auth was set. */
1059 smtp_authenticated = TRUE; /* stops the outer loop */
1060 client_authenticator = au->name;
1061 if (au->set_client_id != NULL)
1062 client_authenticated_id = expand_string(au->set_client_id);
1065 /* Failure after writing a command */
1070 /* Failure after reading a response */
1073 if (errno != 0 || buffer[0] != '5') return FAIL;
1074 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1075 au->name, host->name, host->address, buffer);
1078 /* Failure by some other means. In effect, the authenticator
1079 decided it wasn't prepared to handle this case. Typically this
1080 is the result of "fail" in an expansion string. Do we need to
1081 log anything here? Feb 2006: a message is now put in the buffer
1082 if logging is required. */
1086 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1087 "authentication H=%s [%s] %s", au->name, host->name,
1088 host->address, buffer);
1091 /* Internal problem, message in buffer. */
1094 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE, NULL);
1098 break; /* If not authenticated, try next authenticator */
1099 } /* Loop for scanning supported server mechanisms */
1100 } /* Loop for further authenticators */
1104 /* If we haven't authenticated, but are required to, give up. */
1106 if (require_auth == OK && !smtp_authenticated)
1108 set_errno(addrlist, ERRNO_AUTHFAIL,
1109 string_sprintf("authentication required but %s", fail_reason), DEFER,
1118 /* Construct AUTH appendix string for MAIL TO */
1121 buffer to build string
1122 addrlist chain of potential addresses to deliver
1123 ob transport options
1125 Globals smtp_authenticated
1126 client_authenticated_sender
1127 Return True on error, otherwise buffer has (possibly empty) terminated string
1131 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1132 smtp_transport_options_block *ob)
1134 uschar *local_authenticated_sender = authenticated_sender;
1137 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1140 if (ob->authenticated_sender != NULL)
1142 uschar *new = expand_string(ob->authenticated_sender);
1145 if (!expand_string_forcedfail)
1147 uschar *message = string_sprintf("failed to expand "
1148 "authenticated_sender: %s", expand_string_message);
1149 set_errno(addrlist, 0, message, DEFER, FALSE, NULL);
1153 else if (new[0] != 0) local_authenticated_sender = new;
1156 /* Add the authenticated sender address if present */
1158 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1159 local_authenticated_sender != NULL)
1161 string_format(buffer, bufsize, " AUTH=%s",
1162 auth_xtextencode(local_authenticated_sender,
1163 Ustrlen(local_authenticated_sender)));
1164 client_authenticated_sender = string_copy(local_authenticated_sender);
1174 #ifdef EXPERIMENTAL_DANE
1176 tlsa_lookup(host_item * host, dns_answer * dnsa,
1177 BOOL dane_required, BOOL * dane)
1179 /* move this out to host.c given the similarity to dns_lookup() ? */
1181 uschar * fullname = buffer;
1183 /* TLSA lookup string */
1184 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1186 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1189 return DEFER; /* just defer this TLS'd conn */
1195 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1201 if (!dns_is_secure(dnsa))
1203 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1214 /*************************************************
1215 * Deliver address list to given host *
1216 *************************************************/
1218 /* If continue_hostname is not null, we get here only when continuing to
1219 deliver down an existing channel. The channel was passed as the standard
1220 input. TLS is never active on a passed channel; the previous process always
1221 closes it down before passing the connection on.
1223 Otherwise, we have to make a connection to the remote host, and do the
1224 initial protocol exchange.
1226 When running as an MUA wrapper, if the sender or any recipient is rejected,
1227 temporarily or permanently, we force failure for all recipients.
1230 addrlist chain of potential addresses to deliver; only those whose
1231 transport_return field is set to PENDING_DEFER are currently
1232 being processed; others should be skipped - they have either
1233 been delivered to an earlier host or IP address, or been
1234 failed by one of them.
1235 host host to deliver to
1236 host_af AF_INET or AF_INET6
1237 port default TCP/IP port to use, in host byte order
1238 interface interface to bind to, or NULL
1239 tblock transport instance block
1240 copy_host TRUE if host set in addr->host_used must be copied, because
1241 it is specific to this call of the transport
1242 message_defer set TRUE if yield is OK, but all addresses were deferred
1243 because of a non-recipient, non-host failure, that is, a
1244 4xx response to MAIL FROM, DATA, or ".". This is a defer
1245 that is specific to the message.
1246 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1247 a second attempt after TLS initialization fails
1249 Returns: OK - the connection was made and the delivery attempted;
1250 the result for each address is in its data block.
1251 DEFER - the connection could not be made, or something failed
1252 while setting up the SMTP session, or there was a
1253 non-message-specific error, such as a timeout.
1254 ERROR - a filter command is specified for this transport,
1255 and there was a problem setting it up; OR helo_data
1256 or add_headers or authenticated_sender is specified
1257 for this transport, and the string failed to expand
1261 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1262 uschar *interface, transport_instance *tblock, BOOL copy_host,
1263 BOOL *message_defer, BOOL suppress_tls)
1266 address_item *sync_addr;
1267 address_item *first_addr = addrlist;
1272 time_t start_delivery_time = time(NULL);
1273 smtp_transport_options_block *ob =
1274 (smtp_transport_options_block *)(tblock->options_block);
1275 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1276 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1278 BOOL send_rset = TRUE;
1279 BOOL send_quit = TRUE;
1280 BOOL setting_up = TRUE;
1281 BOOL completed_address = FALSE;
1284 BOOL pass_message = FALSE;
1285 #ifndef DISABLE_PRDR
1286 BOOL prdr_offered = FALSE;
1289 #ifdef EXPERIMENTAL_DSN
1290 BOOL dsn_all_lasthop = TRUE;
1292 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1294 dns_answer tlsa_dnsa;
1296 smtp_inblock inblock;
1297 smtp_outblock outblock;
1298 int max_rcpt = tblock->max_addresses;
1299 uschar *igquotstr = US"";
1300 uschar *helo_data = NULL;
1301 uschar *message = NULL;
1302 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1304 uschar buffer[4096];
1305 uschar inbuffer[4096];
1306 uschar outbuffer[4096];
1308 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1310 *message_defer = FALSE;
1311 smtp_command = US"initial connection";
1312 if (max_rcpt == 0) max_rcpt = 999999;
1314 /* Set up the buffer for reading SMTP response packets. */
1316 inblock.buffer = inbuffer;
1317 inblock.buffersize = sizeof(inbuffer);
1318 inblock.ptr = inbuffer;
1319 inblock.ptrend = inbuffer;
1321 /* Set up the buffer for holding SMTP commands while pipelining */
1323 outblock.buffer = outbuffer;
1324 outblock.buffersize = sizeof(outbuffer);
1325 outblock.ptr = outbuffer;
1326 outblock.cmd_count = 0;
1327 outblock.authenticating = FALSE;
1329 /* Reset the parameters of a TLS session. */
1332 tls_out.cipher = NULL; /* the one we may use for this transport */
1333 tls_out.ourcert = NULL;
1334 tls_out.peercert = NULL;
1335 tls_out.peerdn = NULL;
1336 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1339 tls_out.ocsp = OCSP_NOT_REQ;
1341 /* Flip the legacy TLS-related variables over to the outbound set in case
1342 they're used in the context of the transport. Don't bother resetting
1343 afterward as we're in a subprocess. */
1345 tls_modify_variables(&tls_out);
1350 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE, NULL);
1355 /* Make a connection to the host if this isn't a continued delivery, and handle
1356 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1357 specially so they can be identified for retries. */
1359 if (continue_hostname == NULL)
1361 /* This puts port into host->port */
1362 inblock.sock = outblock.sock =
1363 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1364 ob->keepalive, ob->dscp
1365 #ifdef EXPERIMENTAL_EVENT
1366 , tblock->event_action
1370 if (inblock.sock < 0)
1372 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1373 NULL, DEFER, FALSE, NULL);
1377 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1381 tls_out.dane_verified = FALSE;
1382 tls_out.tlsa_usage = 0;
1384 dane_required = verify_check_this_host(&ob->hosts_require_dane, NULL,
1385 host->name, host->address, NULL) == OK;
1387 if (host->dnssec == DS_YES)
1390 || verify_check_this_host(&ob->hosts_try_dane, NULL,
1391 host->name, host->address, NULL) == OK
1393 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
1396 else if (dane_required)
1398 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1403 ob->tls_tempfail_tryclear = FALSE;
1407 /* Expand the greeting message while waiting for the initial response. (Makes
1408 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1409 delayed till here so that $sending_interface and $sending_port are set. */
1411 helo_data = expand_string(ob->helo_data);
1413 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1414 is nevertheless a reasonably clean way of programming this kind of logic,
1415 where you want to escape on any error. */
1419 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1420 ob->command_timeout)) goto RESPONSE_FAILED;
1422 #ifdef EXPERIMENTAL_EVENT
1425 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1426 : host->dnssec==DS_NO ? US"no" : NULL;
1427 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1430 set_errno(addrlist, 0,
1431 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1432 DEFER, FALSE, NULL);
1439 /* Now check if the helo_data expansion went well, and sign off cleanly if
1442 if (helo_data == NULL)
1444 uschar *message = string_sprintf("failed to expand helo_data: %s",
1445 expand_string_message);
1446 set_errno(addrlist, 0, message, DEFER, FALSE, NULL);
1452 /** Debugging without sending a message
1453 addrlist->transport_return = DEFER;
1457 /* Errors that occur after this point follow an SMTP command, which is
1458 left in big_buffer by smtp_write_command() for use in error messages. */
1460 smtp_command = big_buffer;
1462 /* Tell the remote who we are...
1464 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1465 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1466 greeting is of this form. The assumption was that the far end supports it
1467 properly... but experience shows that there are some that give 5xx responses,
1468 even though the banner includes "ESMTP" (there's a bloody-minded one that
1469 says "ESMTP not spoken here"). Cope with that case.
1471 September 2000: Time has passed, and it seems reasonable now to always send
1472 EHLO at the start. It is also convenient to make the change while installing
1475 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1476 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1477 would be no way to send out the mails, so there is now a host list
1478 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1479 PIPELINING problem as well. Maybe it can also be useful to cure other
1480 problems with broken servers.
1482 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1483 Then somebody tried it with a Microsoft mailer... It seems that all other
1484 mailers use upper case for some reason (the RFC is quite clear about case
1485 independence) so, for peace of mind, I gave in. */
1487 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1488 host->name, host->address, NULL) != OK;
1490 /* Alas; be careful, since this goto is not an error-out, so conceivably
1491 we might set data between here and the target which we assume to exist
1492 and be usable. I can see this coming back to bite us. */
1497 suppress_tls = FALSE;
1498 ob->tls_tempfail_tryclear = FALSE;
1499 smtp_command = US"SSL-on-connect";
1506 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1507 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1509 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1510 ob->command_timeout))
1512 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1519 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1524 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1526 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1527 ob->command_timeout)) goto RESPONSE_FAILED;
1530 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1531 lmtp_ignore_quota option was set. */
1533 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1534 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1535 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1537 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1540 tls_offered = esmtp &&
1541 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1542 PCRE_EOPT, NULL, 0) >= 0;
1545 #ifndef DISABLE_PRDR
1546 prdr_offered = esmtp &&
1547 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1548 PCRE_EOPT, NULL, 0) >= 0) &&
1549 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1550 host->address, NULL) == OK);
1553 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1557 /* For continuing deliveries down the same channel, the socket is the standard
1558 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1559 below). Set up the pointer to where subsequent commands will be left, for
1560 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1561 set from the command line if they were set in the process that passed the
1566 inblock.sock = outblock.sock = fileno(stdin);
1567 smtp_command = big_buffer;
1568 host->port = port; /* Record the port that was used */
1571 /* If TLS is available on this connection, whether continued or not, attempt to
1572 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1573 send another EHLO - the server may give a different answer in secure mode. We
1574 use a separate buffer for reading the response to STARTTLS so that if it is
1575 negative, the original EHLO data is available for subsequent analysis, should
1576 the client not be required to use TLS. If the response is bad, copy the buffer
1577 for error analysis. */
1580 if (tls_offered && !suppress_tls &&
1581 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1582 host->address, NULL) != OK)
1584 uschar buffer2[4096];
1585 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1588 /* If there is an I/O error, transmission of this message is deferred. If
1589 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1590 false, we also defer. However, if there is a temporary rejection of STARTTLS
1591 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1592 STARTTLS, we carry on. This means we will try to send the message in clear,
1593 unless the host is in hosts_require_tls (tested below). */
1595 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1596 ob->command_timeout))
1598 if (errno != 0 || buffer2[0] == 0 ||
1599 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1601 Ustrncpy(buffer, buffer2, sizeof(buffer));
1602 goto RESPONSE_FAILED;
1606 /* STARTTLS accepted: try to negotiate a TLS session. */
1611 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1612 # ifdef EXPERIMENTAL_DANE
1613 , dane ? &tlsa_dnsa : NULL
1617 /* TLS negotiation failed; give an error. From outside, this function may
1618 be called again to try in clear on a new connection, if the options permit
1619 it for this host. */
1623 save_errno = ERRNO_TLSFAILURE;
1624 message = US"failure while setting up TLS session";
1629 /* TLS session is set up */
1631 for (addr = addrlist; addr != NULL; addr = addr->next)
1632 if (addr->transport_return == PENDING_DEFER)
1634 addr->cipher = tls_out.cipher;
1635 addr->ourcert = tls_out.ourcert;
1636 addr->peercert = tls_out.peercert;
1637 addr->peerdn = tls_out.peerdn;
1638 addr->ocsp = tls_out.ocsp;
1643 /* if smtps, we'll have smtp_command set to something else; always safe to
1645 smtp_command = big_buffer;
1647 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1648 helo_data is null, we are dealing with a connection that was passed from
1649 another process, and so we won't have expanded helo_data above. We have to
1650 expand it here. $sending_ip_address and $sending_port are set up right at the
1651 start of the Exim process (in exim.c). */
1653 if (tls_out.active >= 0)
1656 if (helo_data == NULL)
1658 helo_data = expand_string(ob->helo_data);
1659 if (helo_data == NULL)
1661 uschar *message = string_sprintf("failed to expand helo_data: %s",
1662 expand_string_message);
1663 set_errno(addrlist, 0, message, DEFER, FALSE, NULL);
1669 /* For SMTPS we need to wait for the initial OK response. */
1672 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1673 ob->command_timeout)) goto RESPONSE_FAILED;
1677 greeting_cmd = "EHLO";
1680 greeting_cmd = "HELO";
1682 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1685 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1686 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1688 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1689 ob->command_timeout))
1690 goto RESPONSE_FAILED;
1693 /* If the host is required to use a secure channel, ensure that we
1697 # ifdef EXPERIMENTAL_DANE
1700 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1701 host->address, NULL) == OK
1704 save_errno = ERRNO_TLSREQUIRED;
1705 message = string_sprintf("a TLS session is required, but %s",
1706 tls_offered? "an attempt to start TLS failed" :
1707 "the server did not offer TLS support");
1710 #endif /*SUPPORT_TLS*/
1712 /* If TLS is active, we have just started it up and re-done the EHLO command,
1713 so its response needs to be analyzed. If TLS is not active and this is a
1714 continued session down a previously-used socket, we haven't just done EHLO, so
1717 if (continue_hostname == NULL
1719 || tls_out.active >= 0
1723 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1724 lmtp_ignore_quota option was set. */
1726 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1727 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1728 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1730 /* If the response to EHLO specified support for the SIZE parameter, note
1731 this, provided size_addition is non-negative. */
1733 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1734 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1735 PCRE_EOPT, NULL, 0) >= 0;
1737 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1738 the current host, esmtp will be false, so PIPELINING can never be used. If
1739 the current host matches hosts_avoid_pipelining, don't do it. */
1741 smtp_use_pipelining = esmtp &&
1742 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1743 host->address, NULL) != OK &&
1744 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1745 PCRE_EOPT, NULL, 0) >= 0;
1747 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1748 smtp_use_pipelining? "" : "not ");
1750 #ifndef DISABLE_PRDR
1751 prdr_offered = esmtp &&
1752 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1753 PCRE_EOPT, NULL, 0) >= 0 &&
1754 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1755 host->address, NULL) == OK;
1758 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1761 #ifdef EXPERIMENTAL_DSN
1762 /* Note if the server supports DSN */
1763 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1764 PCRE_EOPT, NULL, 0) >= 0;
1765 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1768 /* Note if the response to EHLO specifies support for the AUTH extension.
1769 If it has, check that this host is one we want to authenticate to, and do
1770 the business. The host name and address must be available when the
1771 authenticator's client driver is running. */
1773 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1774 ob, esmtp, &inblock, &outblock))
1776 default: goto SEND_QUIT;
1778 case FAIL_SEND: goto SEND_FAILED;
1779 case FAIL: goto RESPONSE_FAILED;
1783 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1784 message-specific. */
1788 /* If there is a filter command specified for this transport, we can now
1789 set it up. This cannot be done until the identify of the host is known. */
1791 if (tblock->filter_command != NULL)
1795 sprintf(CS buffer, "%.50s transport", tblock->name);
1796 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1797 TRUE, DEFER, addrlist, buffer, NULL);
1798 transport_filter_timeout = tblock->filter_timeout;
1800 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1805 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1813 /* For messages that have more than the maximum number of envelope recipients,
1814 we want to send several transactions down the same SMTP connection. (See
1815 comments in deliver.c as to how this reconciles, heuristically, with
1816 remote_max_parallel.) This optimization was added to Exim after the following
1817 code was already working. The simplest way to put it in without disturbing the
1818 code was to use a goto to jump back to this point when there is another
1819 transaction to handle. */
1822 sync_addr = first_addr;
1826 completed_address = FALSE;
1829 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1830 qualification, send it, adding something to the message size to allow for
1831 imprecision and things that get added en route. Exim keeps the number of lines
1832 in a message, so we can give an accurate value for the original message, but we
1833 need some additional to handle added headers. (Double "." characters don't get
1834 included in the count.) */
1841 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1845 #ifndef DISABLE_PRDR
1846 prdr_active = FALSE;
1849 for (addr = first_addr; addr; addr = addr->next)
1850 if (addr->transport_return == PENDING_DEFER)
1852 for (addr = addr->next; addr; addr = addr->next)
1853 if (addr->transport_return == PENDING_DEFER)
1854 { /* at least two recipients to send */
1856 sprintf(CS p, " PRDR"); p += 5;
1864 #ifdef EXPERIMENTAL_DSN
1865 /* check if all addresses have lasthop flag */
1866 /* do not send RET and ENVID if true */
1867 dsn_all_lasthop = TRUE;
1868 for (addr = first_addr;
1869 address_count < max_rcpt && addr != NULL;
1871 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1872 dsn_all_lasthop = FALSE;
1874 /* Add any DSN flags to the mail command */
1876 if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1878 if (dsn_ret == dsn_ret_hdrs)
1880 Ustrcpy(p, " RET=HDRS");
1883 else if (dsn_ret == dsn_ret_full)
1885 Ustrcpy(p, " RET=FULL");
1888 if (dsn_envid != NULL)
1890 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1896 /* If an authenticated_sender override has been specified for this transport
1897 instance, expand it. If the expansion is forced to fail, and there was already
1898 an authenticated_sender for this message, the original value will be used.
1899 Other expansion failures are serious. An empty result is ignored, but there is
1900 otherwise no check - this feature is expected to be used with LMTP and other
1901 cases where non-standard addresses (e.g. without domains) might be required. */
1903 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1909 /* From here until we send the DATA command, we can make use of PIPELINING
1910 if the server host supports it. The code has to be able to check the responses
1911 at any point, for when the buffer fills up, so we write it totally generally.
1912 When PIPELINING is off, each command written reports that it has flushed the
1915 pending_MAIL = TRUE; /* The block starts with MAIL */
1917 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1918 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1919 mail_command = string_copy(big_buffer); /* Save for later error message */
1923 case -1: /* Transmission error */
1926 case +1: /* Block was sent */
1927 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1928 ob->command_timeout))
1930 if (errno == 0 && buffer[0] == '4')
1932 errno = ERRNO_MAIL4XX;
1933 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1935 goto RESPONSE_FAILED;
1937 pending_MAIL = FALSE;
1941 /* Pass over all the relevant recipient addresses for this host, which are the
1942 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1943 several before we have to read the responses for those seen so far. This
1944 checking is done by a subroutine because it also needs to be done at the end.
1945 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1946 the next one if not all are sent.
1948 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1949 last address because we want to abort if any recipients have any kind of
1950 problem, temporary or permanent. We know that all recipient addresses will have
1951 the PENDING_DEFER status, because only one attempt is ever made, and we know
1952 that max_rcpt will be large, so all addresses will be done at once. */
1954 for (addr = first_addr;
1955 address_count < max_rcpt && addr != NULL;
1961 #ifdef EXPERIMENTAL_DSN
1962 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
1965 if (addr->transport_return != PENDING_DEFER) continue;
1968 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1970 #ifdef EXPERIMENTAL_DSN
1971 /* Add any DSN flags to the rcpt command and add to the sent string */
1976 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
1978 if ((addr->dsn_flags & rf_dsnflags) != 0)
1982 Ustrcpy(p, " NOTIFY=");
1984 for (i = 0; i < 4; i++)
1985 if ((addr->dsn_flags & rf_list[i]) != 0)
1987 if (!first) *p++ = ',';
1989 Ustrcpy(p, rf_names[i]);
1994 if (addr->dsn_orcpt != NULL)
1996 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2004 /* Now send the RCPT command, and process outstanding responses when
2005 necessary. After a timeout on RCPT, we just end the function, leaving the
2006 yield as OK, because this error can often mean that there is a problem with
2007 just one address, so we don't want to delay the host. */
2009 #ifdef EXPERIMENTAL_DSN
2010 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2011 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
2013 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
2014 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
2017 if (count < 0) goto SEND_FAILED;
2020 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2021 &sync_addr, host, count, ob->address_retry_include_sender,
2022 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2025 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2026 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2029 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2030 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2031 case 0: /* No 2xx or 5xx, but no probs */
2034 case -1: goto END_OFF; /* Timeout on RCPT */
2035 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2037 pending_MAIL = FALSE; /* Dealt with MAIL */
2039 } /* Loop for next address */
2041 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2042 permanently or temporarily. We should have flushed and synced after the last
2047 address_item *badaddr;
2048 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
2050 if (badaddr->transport_return != PENDING_OK) break;
2052 if (badaddr != NULL)
2054 set_errno(addrlist, 0, badaddr->message, FAIL,
2055 testflag(badaddr, af_pass_message), NULL);
2060 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2061 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2062 have a good recipient buffered up if we are pipelining. We don't want to waste
2063 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2064 are pipelining. The responses are all handled by sync_responses(). */
2066 if (ok || (smtp_use_pipelining && !mua_wrapper))
2068 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2069 if (count < 0) goto SEND_FAILED;
2070 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2071 host, count, ob->address_retry_include_sender, pending_MAIL,
2072 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2074 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2075 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2078 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2079 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2080 case 0: break; /* No 2xx or 5xx, but no probs */
2082 case -1: goto END_OFF; /* Timeout on RCPT */
2083 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2087 /* Save the first address of the next batch. */
2091 /* If there were no good recipients (but otherwise there have been no
2092 problems), just set ok TRUE, since we have handled address-specific errors
2093 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2094 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2095 well as body. Set the appropriate timeout value to be used for each chunk.
2096 (Haven't been able to make it work using select() for writing yet.) */
2098 if (!ok) ok = TRUE; else
2100 sigalrm_seen = FALSE;
2101 transport_write_timeout = ob->data_timeout;
2102 smtp_command = US"sending data block"; /* For error messages */
2103 DEBUG(D_transport|D_v)
2104 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2105 transport_count = 0;
2107 #ifndef DISABLE_DKIM
2108 ok = dkim_transport_write_message(addrlist, inblock.sock,
2109 topt_use_crlf | topt_end_dot | topt_escape_headers |
2110 (tblock->body_only? topt_no_headers : 0) |
2111 (tblock->headers_only? topt_no_body : 0) |
2112 (tblock->return_path_add? topt_add_return_path : 0) |
2113 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2114 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2115 0, /* No size limit */
2116 tblock->add_headers, tblock->remove_headers,
2117 US".", US"..", /* Escaping strings */
2118 tblock->rewrite_rules, tblock->rewrite_existflags,
2119 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2120 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2123 ok = transport_write_message(addrlist, inblock.sock,
2124 topt_use_crlf | topt_end_dot | topt_escape_headers |
2125 (tblock->body_only? topt_no_headers : 0) |
2126 (tblock->headers_only? topt_no_body : 0) |
2127 (tblock->return_path_add? topt_add_return_path : 0) |
2128 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2129 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2130 0, /* No size limit */
2131 tblock->add_headers, tblock->remove_headers,
2132 US".", US"..", /* Escaping strings */
2133 tblock->rewrite_rules, tblock->rewrite_existflags);
2136 /* transport_write_message() uses write() because it is called from other
2137 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2138 it can exit with "Broken pipe" as its error. This really means that the
2139 socket got closed at the far end. */
2141 transport_write_timeout = 0; /* for subsequent transports */
2143 /* Failure can either be some kind of I/O disaster (including timeout),
2144 or the failure of a transport filter or the expansion of added headers. */
2148 buffer[0] = 0; /* There hasn't been a response */
2149 goto RESPONSE_FAILED;
2152 /* We used to send the terminating "." explicitly here, but because of
2153 buffering effects at both ends of TCP/IP connections, you don't gain
2154 anything by keeping it separate, so it might as well go in the final
2155 data buffer for efficiency. This is now done by setting the topt_end_dot
2158 smtp_command = US"end of data";
2160 #ifndef DISABLE_PRDR
2161 /* For PRDR we optionally get a partial-responses warning
2162 * followed by the individual responses, before going on with
2163 * the overall response. If we don't get the warning then deal
2164 * with per non-PRDR. */
2167 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2169 if (!ok && errno == 0)
2172 case '2': prdr_active = FALSE;
2175 case '4': errno = ERRNO_DATA4XX;
2176 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2183 /* For non-PRDR SMTP, we now read a single response that applies to the
2184 whole message. If it is OK, then all the addresses have been delivered. */
2188 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2190 if (!ok && errno == 0 && buffer[0] == '4')
2192 errno = ERRNO_DATA4XX;
2193 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2197 /* For LMTP, we get back a response for every RCPT command that we sent;
2198 some may be accepted and some rejected. For those that get a response, their
2199 status is fixed; any that are accepted have been handed over, even if later
2200 responses crash - at least, that's how I read RFC 2033.
2202 If all went well, mark the recipient addresses as completed, record which
2203 host/IPaddress they were delivered to, and cut out RSET when sending another
2204 message down the same channel. Write the completed addresses to the journal
2205 now so that they are recorded in case there is a crash of hardware or
2206 software before the spool gets updated. Also record the final SMTP
2207 confirmation if needed (for SMTP only). */
2212 int delivery_time = (int)(time(NULL) - start_delivery_time);
2215 uschar *conf = NULL;
2218 /* Make a copy of the host if it is local to this invocation
2219 of the transport. */
2223 thost = store_get(sizeof(host_item));
2225 thost->name = string_copy(host->name);
2226 thost->address = string_copy(host->address);
2230 /* Set up confirmation if needed - applies only to SMTP */
2233 #ifndef EXPERIMENTAL_EVENT
2234 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2239 uschar *s = string_printing(buffer);
2240 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2243 /* Process all transported addresses - for LMTP or PRDR, read a status for
2246 for (addr = addrlist; addr != first_addr; addr = addr->next)
2248 if (addr->transport_return != PENDING_OK) continue;
2250 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2251 remaining addresses. Otherwise, it's a return code for just the one
2252 address. For temporary errors, add a retry item for the address so that
2253 it doesn't get tried again too soon. */
2255 #ifndef DISABLE_PRDR
2256 if (lmtp || prdr_active)
2261 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2264 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2265 addr->message = string_sprintf(
2266 #ifndef DISABLE_PRDR
2267 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2269 "LMTP error after %s: %s",
2271 big_buffer, string_printing(buffer));
2272 setflag(addr, af_pass_message); /* Allow message to go to user */
2273 if (buffer[0] == '5')
2274 addr->transport_return = FAIL;
2277 errno = ERRNO_DATA4XX;
2278 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2279 addr->transport_return = DEFER;
2280 #ifndef DISABLE_PRDR
2283 retry_add_item(addr, addr->address_retry_key, 0);
2287 completed_address = TRUE; /* NOW we can set this flag */
2288 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2290 uschar *s = string_printing(buffer);
2291 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2295 /* SMTP, or success return from LMTP for this address. Pass back the
2296 actual host that was used. */
2298 addr->transport_return = OK;
2299 addr->more_errno = delivery_time;
2300 addr->host_used = thost;
2301 addr->special_action = flag;
2302 addr->message = conf;
2303 #ifndef DISABLE_PRDR
2304 if (prdr_active) addr->flags |= af_prdr_used;
2308 #ifndef DISABLE_PRDR
2312 /* Update the journal. For homonymic addresses, use the base address plus
2313 the transport name. See lots of comments in deliver.c about the reasons
2314 for the complications when homonyms are involved. Just carry on after
2315 write error, as it may prove possible to update the spool file later. */
2317 if (testflag(addr, af_homonym))
2318 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2320 sprintf(CS buffer, "%.500s\n", addr->unique);
2322 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2323 len = Ustrlen(CS buffer);
2324 if (write(journal_fd, buffer, len) != len)
2325 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2326 "%s: %s", buffer, strerror(errno));
2330 #ifndef DISABLE_PRDR
2333 /* PRDR - get the final, overall response. For any non-success
2334 upgrade all the address statuses. */
2335 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2339 if(errno == 0 && buffer[0] == '4')
2341 errno = ERRNO_DATA4XX;
2342 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2344 for (addr = addrlist; addr != first_addr; addr = addr->next)
2345 if (buffer[0] == '5' || addr->transport_return == OK)
2346 addr->transport_return = PENDING_OK; /* allow set_errno action */
2347 goto RESPONSE_FAILED;
2350 /* Update the journal, or setup retry. */
2351 for (addr = addrlist; addr != first_addr; addr = addr->next)
2352 if (addr->transport_return == OK)
2354 if (testflag(addr, af_homonym))
2355 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2357 sprintf(CS buffer, "%.500s\n", addr->unique);
2359 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2360 len = Ustrlen(CS buffer);
2361 if (write(journal_fd, buffer, len) != len)
2362 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2363 "%s: %s", buffer, strerror(errno));
2365 else if (addr->transport_return == DEFER)
2366 retry_add_item(addr, addr->address_retry_key, -2);
2370 /* Ensure the journal file is pushed out to disk. */
2372 if (EXIMfsync(journal_fd) < 0)
2373 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2379 /* Handle general (not specific to one address) failures here. The value of ok
2380 is used to skip over this code on the falling through case. A timeout causes a
2381 deferral. Other errors may defer or fail according to the response code, and
2382 may set up a special errno value, e.g. after connection chopped, which is
2383 assumed if errno == 0 and there is no text in the buffer. If control reaches
2384 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2385 the problem is not related to this specific message. */
2394 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2395 buffer, &code, &message, &pass_message);
2401 message = US string_sprintf("send() to %s [%s] failed: %s",
2402 host->name, host->address, strerror(save_errno));
2406 /* This label is jumped to directly when a TLS negotiation has failed,
2407 or was not done for a host for which it is required. Values will be set
2408 in message and save_errno, and setting_up will always be true. Treat as
2409 a temporary error. */
2416 /* If the failure happened while setting up the call, see if the failure was
2417 a 5xx response (this will either be on connection, or following HELO - a 5xx
2418 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2419 never going to accept them. For other errors during setting up (timeouts or
2420 whatever), defer all addresses, and yield DEFER, so that the host is not
2421 tried again for a while. */
2424 ok = FALSE; /* For when reached by GOTO */
2429 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2432 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2437 /* We want to handle timeouts after MAIL or "." and loss of connection after
2438 "." specially. They can indicate a problem with the sender address or with
2439 the contents of the message rather than a real error on the connection. These
2440 cases are treated in the same way as a 4xx response. This next bit of code
2441 does the classification. */
2452 message_error = TRUE;
2456 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2457 Ustrncmp(smtp_command,"end ",4) == 0;
2460 case ERRNO_SMTPCLOSED:
2461 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2465 message_error = FALSE;
2469 /* Handle the cases that are treated as message errors. These are:
2471 (a) negative response or timeout after MAIL
2472 (b) negative response after DATA
2473 (c) negative response or timeout or dropped connection after "."
2475 It won't be a negative response or timeout after RCPT, as that is dealt
2476 with separately above. The action in all cases is to set an appropriate
2477 error code for all the addresses, but to leave yield set to OK because the
2478 host itself has not failed. Of course, it might in practice have failed
2479 when we've had a timeout, but if so, we'll discover that at the next
2480 delivery attempt. For a temporary error, set the message_defer flag, and
2481 write to the logs for information if this is not the last host. The error
2482 for the last host will be logged as part of the address's log line. */
2486 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2487 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2488 pass_message, host);
2490 /* If there's an errno, the message contains just the identity of
2493 if (code != '5') /* Anything other than 5 is treated as temporary */
2496 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2497 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2498 msglog_line(host, message);
2499 *message_defer = TRUE;
2503 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2504 ".", or some other transportation error. We defer all addresses and yield
2505 DEFER, except for the case of failed add_headers expansion, or a transport
2506 filter failure, when the yield should be ERROR, to stop it trying other
2511 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2512 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2513 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2519 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2520 SMTP session tidily. However, if there were too many addresses to send in one
2521 message (indicated by first_addr being non-NULL) we want to carry on with the
2522 rest of them. Also, it is desirable to send more than one message down the SMTP
2523 connection if there are several waiting, provided we haven't already sent so
2524 many as to hit the configured limit. The function transport_check_waiting looks
2525 for a waiting message and returns its id. Then transport_pass_socket tries to
2526 set up a continued delivery by passing the socket on to another process. The
2527 variable send_rset is FALSE if a message has just been successfully transfered.
2529 If we are already sending down a continued channel, there may be further
2530 addresses not yet delivered that are aimed at the same host, but which have not
2531 been passed in this run of the transport. In this case, continue_more will be
2532 true, and all we should do is send RSET if necessary, and return, leaving the
2535 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2536 do not want to continue with other messages down the same channel, because that
2537 can lead to looping between two or more messages, all with the same,
2538 temporarily failing address(es). [The retry information isn't updated yet, so
2539 new processes keep on trying.] We probably also don't want to try more of this
2540 message's addresses either.
2542 If we have started a TLS session, we have to end it before passing the
2543 connection to a new process. However, not all servers can handle this (Exim
2544 can), so we do not pass such a connection on if the host matches
2545 hosts_nopass_tls. */
2548 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2549 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2550 continue_more, yield, (first_addr == NULL)? "":"not ");
2552 if (completed_address && ok && send_quit)
2555 if (first_addr != NULL || continue_more ||
2557 (tls_out.active < 0 ||
2558 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2559 host->address, NULL) != OK)
2561 transport_check_waiting(tblock->name, host->name,
2562 tblock->connection_max_messages, new_message_id, &more)
2570 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2572 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2573 host->address, strerror(save_errno));
2576 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2577 ob->command_timeout)))
2580 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2584 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2585 host->name, host->address, msg);
2590 /* Either RSET was not needed, or it succeeded */
2594 if (first_addr != NULL) /* More addresses still to be sent */
2595 { /* in this run of the transport */
2596 continue_sequence++; /* Causes * in logging */
2599 if (continue_more) return yield; /* More addresses for another run */
2601 /* Pass the socket to a new Exim process. Before doing so, we must shut
2602 down TLS. Not all MTAs allow for the continuation of the SMTP session
2603 when TLS is shut down. We test for this by sending a new EHLO. If we
2604 don't get a good response, we don't attempt to pass the socket on. */
2607 if (tls_out.active >= 0)
2609 tls_close(FALSE, TRUE);
2613 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2614 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2615 ob->command_timeout);
2619 /* If the socket is successfully passed, we musn't send QUIT (or
2620 indeed anything!) from here. */
2622 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2623 new_message_id, inblock.sock))
2629 /* If RSET failed and there are addresses left, they get deferred. */
2631 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2635 /* End off tidily with QUIT unless the connection has died or the socket has
2636 been passed to another process. There has been discussion on the net about what
2637 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2638 to wait for a response, but on the other hand, there isn't anything one can do
2639 with an error response, other than log it. Exim used to do that. However,
2640 further discussion suggested that it is positively advantageous not to wait for
2641 the response, but to close the session immediately. This is supposed to move
2642 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2643 load from the server. (Hosts that are both servers and clients may not see much
2644 difference, of course.) Further discussion indicated that this was safe to do
2645 on Unix systems which have decent implementations of TCP/IP that leave the
2646 connection around for a while (TIME_WAIT) after the application has gone away.
2647 This enables the response sent by the server to be properly ACKed rather than
2648 timed out, as can happen on broken TCP/IP implementations on other OS.
2650 This change is being made on 31-Jul-98. After over a year of trouble-free
2651 operation, the old commented-out code was removed on 17-Sep-99. */
2654 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2659 tls_close(FALSE, TRUE);
2662 /* Close the socket, and return the appropriate value, first setting
2663 works because the NULL setting is passed back to the calling process, and
2664 remote_max_parallel is forced to 1 when delivering over an existing connection,
2666 If all went well and continue_more is set, we shouldn't actually get here if
2667 there are further addresses, as the return above will be taken. However,
2668 writing RSET might have failed, or there may be other addresses whose hosts are
2669 specified in the transports, and therefore not visible at top level, in which
2670 case continue_more won't get set. */
2672 (void)close(inblock.sock);
2674 #ifdef EXPERIMENTAL_EVENT
2675 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2678 continue_transport = NULL;
2679 continue_hostname = NULL;
2686 /*************************************************
2687 * Closedown entry point *
2688 *************************************************/
2690 /* This function is called when exim is passed an open smtp channel
2691 from another incarnation, but the message which it has been asked
2692 to deliver no longer exists. The channel is on stdin.
2694 We might do fancy things like looking for another message to send down
2695 the channel, but if the one we sought has gone, it has probably been
2696 delivered by some other process that itself will seek further messages,
2697 so just close down our connection.
2699 Argument: pointer to the transport instance block
2704 smtp_transport_closedown(transport_instance *tblock)
2706 smtp_transport_options_block *ob =
2707 (smtp_transport_options_block *)(tblock->options_block);
2708 smtp_inblock inblock;
2709 smtp_outblock outblock;
2711 uschar inbuffer[4096];
2712 uschar outbuffer[16];
2714 inblock.sock = fileno(stdin);
2715 inblock.buffer = inbuffer;
2716 inblock.buffersize = sizeof(inbuffer);
2717 inblock.ptr = inbuffer;
2718 inblock.ptrend = inbuffer;
2720 outblock.sock = inblock.sock;
2721 outblock.buffersize = sizeof(outbuffer);
2722 outblock.buffer = outbuffer;
2723 outblock.ptr = outbuffer;
2724 outblock.cmd_count = 0;
2725 outblock.authenticating = FALSE;
2727 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2728 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2729 ob->command_timeout);
2730 (void)close(inblock.sock);
2735 /*************************************************
2736 * Prepare addresses for delivery *
2737 *************************************************/
2739 /* This function is called to flush out error settings from previous delivery
2740 attempts to other hosts. It also records whether we got here via an MX record
2741 or not in the more_errno field of the address. We are interested only in
2742 addresses that are still marked DEFER - others may have got delivered to a
2743 previously considered IP address. Set their status to PENDING_DEFER to indicate
2744 which ones are relevant this time.
2747 addrlist the list of addresses
2748 host the host we are delivering to
2750 Returns: the first address for this delivery
2753 static address_item *
2754 prepare_addresses(address_item *addrlist, host_item *host)
2756 address_item *first_addr = NULL;
2758 for (addr = addrlist; addr != NULL; addr = addr->next)
2760 if (addr->transport_return != DEFER) continue;
2761 if (first_addr == NULL) first_addr = addr;
2762 addr->transport_return = PENDING_DEFER;
2763 addr->basic_errno = 0;
2764 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2765 addr->message = NULL;
2767 addr->cipher = NULL;
2768 addr->ourcert = NULL;
2769 addr->peercert = NULL;
2770 addr->peerdn = NULL;
2771 addr->ocsp = OCSP_NOT_REQ;
2779 /*************************************************
2780 * Main entry point *
2781 *************************************************/
2783 /* See local README for interface details. As this is a remote transport, it is
2784 given a chain of addresses to be delivered in one connection, if possible. It
2785 always returns TRUE, indicating that each address has its own independent
2786 status set, except if there is a setting up problem, in which case it returns
2790 smtp_transport_entry(
2791 transport_instance *tblock, /* data for this instantiation */
2792 address_item *addrlist) /* addresses we are working on */
2796 int hosts_defer = 0;
2798 int hosts_looked_up = 0;
2799 int hosts_retry = 0;
2800 int hosts_serial = 0;
2801 int hosts_total = 0;
2802 int total_hosts_tried = 0;
2804 BOOL expired = TRUE;
2805 BOOL continuing = continue_hostname != NULL;
2806 uschar *expanded_hosts = NULL;
2808 uschar *tid = string_sprintf("%s transport", tblock->name);
2809 smtp_transport_options_block *ob =
2810 (smtp_transport_options_block *)(tblock->options_block);
2811 host_item *hostlist = addrlist->host_list;
2812 host_item *host = NULL;
2816 debug_printf("%s transport entered\n", tblock->name);
2817 for (addr = addrlist; addr != NULL; addr = addr->next)
2818 debug_printf(" %s\n", addr->address);
2819 if (continuing) debug_printf("already connected to %s [%s]\n",
2820 continue_hostname, continue_host_address);
2823 /* Set the flag requesting that these hosts be added to the waiting
2824 database if the delivery fails temporarily or if we are running with
2825 queue_smtp or a 2-stage queue run. This gets unset for certain
2826 kinds of error, typically those that are specific to the message. */
2828 update_waiting = TRUE;
2830 /* If a host list is not defined for the addresses - they must all have the
2831 same one in order to be passed to a single transport - or if the transport has
2832 a host list with hosts_override set, use the host list supplied with the
2833 transport. It is an error for this not to exist. */
2835 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2837 if (ob->hosts == NULL)
2839 addrlist->message = string_sprintf("%s transport called with no hosts set",
2841 addrlist->transport_return = PANIC;
2842 return FALSE; /* Only top address has status */
2845 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2848 /* If the transport's host list contains no '$' characters, and we are not
2849 randomizing, it is fixed and therefore a chain of hosts can be built once
2850 and for all, and remembered for subsequent use by other calls to this
2851 transport. If, on the other hand, the host list does contain '$', or we are
2852 randomizing its order, we have to rebuild it each time. In the fixed case,
2853 as the hosts string will never be used again, it doesn't matter that we
2854 replace all the : characters with zeros. */
2856 if (ob->hostlist == NULL)
2858 uschar *s = ob->hosts;
2860 if (Ustrchr(s, '$') != NULL)
2862 expanded_hosts = expand_string(s);
2863 if (expanded_hosts == NULL)
2865 addrlist->message = string_sprintf("failed to expand list of hosts "
2866 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2867 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2868 return FALSE; /* Only top address has status */
2870 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2871 "\"%s\"\n", s, expanded_hosts);
2875 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2877 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2879 /* Check that the expansion yielded something useful. */
2880 if (hostlist == NULL)
2883 string_sprintf("%s transport has empty hosts setting", tblock->name);
2884 addrlist->transport_return = PANIC;
2885 return FALSE; /* Only top address has status */
2888 /* If there was no expansion of hosts, save the host list for
2891 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2894 /* This is not the first time this transport has been run in this delivery;
2895 the host list was built previously. */
2897 else hostlist = ob->hostlist;
2900 /* The host list was supplied with the address. If hosts_randomize is set, we
2901 must sort it into a random order if it did not come from MX records and has not
2902 already been randomized (but don't bother if continuing down an existing
2905 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2907 host_item *newlist = NULL;
2908 while (hostlist != NULL)
2910 host_item *h = hostlist;
2911 hostlist = hostlist->next;
2913 h->sort_key = random_number(100);
2915 if (newlist == NULL)
2920 else if (h->sort_key < newlist->sort_key)
2927 host_item *hh = newlist;
2928 while (hh->next != NULL)
2930 if (h->sort_key < hh->next->sort_key) break;
2938 hostlist = addrlist->host_list = newlist;
2942 /* Sort out the default port. */
2944 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2947 /* For each host-plus-IP-address on the list:
2949 . If this is a continued delivery and the host isn't the one with the
2950 current connection, skip.
2952 . If the status is unusable (i.e. previously failed or retry checked), skip.
2954 . If no IP address set, get the address, either by turning the name into
2955 an address, calling gethostbyname if gethostbyname is on, or by calling
2956 the DNS. The DNS may yield multiple addresses, in which case insert the
2957 extra ones into the list.
2959 . Get the retry data if not previously obtained for this address and set the
2960 field which remembers the state of this address. Skip if the retry time is
2961 not reached. If not, remember whether retry data was found. The retry string
2962 contains both the name and the IP address.
2964 . Scan the list of addresses and mark those whose status is DEFER as
2965 PENDING_DEFER. These are the only ones that will be processed in this cycle
2968 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2969 Some addresses may be successfully delivered, others may fail, and yet
2970 others may get temporary errors and so get marked DEFER.
2972 . The return from the delivery attempt is OK if a connection was made and a
2973 valid SMTP dialogue was completed. Otherwise it is DEFER.
2975 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2977 . If fail to connect, or other defer state, add a retry item.
2979 . If there are any addresses whose status is still DEFER, carry on to the
2980 next host/IPaddress, unless we have tried the number of hosts given
2981 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2982 there is some fancy logic for hosts_max_try that means its limit can be
2983 overstepped in some circumstances.
2985 If we get to the end of the list, all hosts have deferred at least one address,
2986 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2987 delivery attempt to those hosts whose last try was before the arrival time of
2988 the current message. To cope with this, we have to go round the loop a second
2989 time. After that, set the status and error data for any addresses that haven't
2990 had it set already. */
2992 for (cutoff_retry = 0; expired &&
2993 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2996 host_item *nexthost = NULL;
2997 int unexpired_hosts_tried = 0;
2999 for (host = hostlist;
3001 unexpired_hosts_tried < ob->hosts_max_try &&
3002 total_hosts_tried < ob->hosts_max_try_hardlimit;
3008 BOOL serialized = FALSE;
3009 BOOL host_is_expired = FALSE;
3010 BOOL message_defer = FALSE;
3011 BOOL ifchanges = FALSE;
3012 BOOL some_deferred = FALSE;
3013 address_item *first_addr = NULL;
3014 uschar *interface = NULL;
3015 uschar *retry_host_key = NULL;
3016 uschar *retry_message_key = NULL;
3017 uschar *serialize_key = NULL;
3019 /* Default next host is next host. :-) But this can vary if the
3020 hosts_max_try limit is hit (see below). It may also be reset if a host
3021 address is looked up here (in case the host was multihomed). */
3023 nexthost = host->next;
3025 /* If the address hasn't yet been obtained from the host name, look it up
3026 now, unless the host is already marked as unusable. If it is marked as
3027 unusable, it means that the router was unable to find its IP address (in
3028 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3029 the lookup failed last time. We don't get this far if *all* MX records
3030 point to non-existent hosts; that is treated as a hard error.
3032 We can just skip this host entirely. When the hosts came from the router,
3033 the address will timeout based on the other host(s); when the address is
3034 looked up below, there is an explicit retry record added.
3036 Note that we mustn't skip unusable hosts if the address is not unset; they
3037 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3039 if (host->address == NULL)
3041 int new_port, flags;
3043 uschar *canonical_name;
3045 if (host->status >= hstatus_unusable)
3047 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3052 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3054 /* The host name is permitted to have an attached port. Find it, and
3055 strip it from the name. Just remember it for now. */
3057 new_port = host_item_get_port(host);
3059 /* Count hosts looked up */
3063 /* Find by name if so configured, or if it's an IP address. We don't
3064 just copy the IP address, because we need the test-for-local to happen. */
3066 flags = HOST_FIND_BY_A;
3067 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3068 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3070 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3071 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
3073 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3074 ob->dnssec_request_domains, ob->dnssec_require_domains,
3075 &canonical_name, NULL);
3077 /* Update the host (and any additional blocks, resulting from
3078 multihoming) with a host-specific port, if any. */
3080 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3082 /* Failure to find the host at this time (usually DNS temporary failure)
3083 is really a kind of routing failure rather than a transport failure.
3084 Therefore we add a retry item of the routing kind, not to stop us trying
3085 to look this name up here again, but to ensure the address gets timed
3086 out if the failures go on long enough. A complete failure at this point
3087 commonly points to a configuration error, but the best action is still
3088 to carry on for the next host. */
3090 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3092 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3094 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3095 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3096 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3097 host->status = hstatus_unusable;
3099 for (addr = addrlist; addr != NULL; addr = addr->next)
3101 if (addr->transport_return != DEFER) continue;
3102 addr->basic_errno = ERRNO_UNKNOWNHOST;
3104 string_sprintf("failed to lookup IP address for %s", host->name);
3109 /* If the host is actually the local host, we may have a problem, or
3110 there may be some cunning configuration going on. In the problem case,
3111 log things and give up. The default transport status is already DEFER. */
3113 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3115 for (addr = addrlist; addr != NULL; addr = addr->next)
3117 addr->basic_errno = 0;
3118 addr->message = string_sprintf("%s transport found host %s to be "
3119 "local", tblock->name, host->name);
3123 } /* End of block for IP address lookup */
3125 /* If this is a continued delivery, we are interested only in the host
3126 which matches the name of the existing open channel. The check is put
3127 here after the local host lookup, in case the name gets expanded as a
3128 result of the lookup. Set expired FALSE, to save the outer loop executing
3131 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3132 Ustrcmp(continue_host_address, host->address) != 0))
3135 continue; /* With next host */
3138 /* Reset the default next host in case a multihomed host whose addresses
3139 are not looked up till just above added to the host list. */
3141 nexthost = host->next;
3143 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3144 domain is in queue_smtp_domains, we don't actually want to attempt any
3145 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3146 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3147 were not in it. We don't want to hold up all SMTP deliveries! Except when
3148 doing a two-stage queue run, don't do this if forcing. */
3150 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3151 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3152 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3155 for (addr = addrlist; addr != NULL; addr = addr->next)
3157 if (addr->transport_return != DEFER) continue;
3158 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3160 continue; /* With next host */
3163 /* Count hosts being considered - purely for an intelligent comment
3164 if none are usable. */
3168 /* Set $host and $host address now in case they are needed for the
3169 interface expansion or the serialize_hosts check; they remain set if an
3170 actual delivery happens. */
3172 deliver_host = host->name;
3173 deliver_host_address = host->address;
3174 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3175 : host->dnssec == DS_NO ? US"no"
3178 /* Set up a string for adding to the retry key if the port number is not
3179 the standard SMTP port. A host may have its own port setting that overrides
3182 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3184 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3186 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3187 string changes upon expansion, we must add it to the key that is used for
3188 retries, because connections to the same host from a different interface
3189 should be treated separately. */
3191 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3192 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3195 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3197 /* The first time round the outer loop, check the status of the host by
3198 inspecting the retry data. The second time round, we are interested only
3199 in expired hosts that haven't been tried since this message arrived. */
3201 if (cutoff_retry == 0)
3204 /* Ensure the status of the address is set by checking retry data if
3205 necessary. There may be host-specific retry data (applicable to all
3206 messages) and also data for retries of a specific message at this host.
3207 If either of these retry records are actually read, the keys used are
3208 returned to save recomputing them later. */
3210 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3211 US"retry_include_ip_address", ob->retry_include_ip_address,
3212 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3213 continue; /* with next host */
3215 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3216 incl_ip, &retry_host_key, &retry_message_key);
3218 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3219 (host->address == NULL)? US"" : host->address, pistring,
3220 (host->status == hstatus_usable)? "usable" :
3221 (host->status == hstatus_unusable)? "unusable" :
3222 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3224 /* Skip this address if not usable at this time, noting if it wasn't
3225 actually expired, both locally and in the address. */
3227 switch (host->status)
3229 case hstatus_unusable:
3231 setflag(addrlist, af_retry_skipped);
3234 case hstatus_unusable_expired:
3237 case hwhy_retry: hosts_retry++; break;
3238 case hwhy_failed: hosts_fail++; break;
3239 case hwhy_deferred: hosts_defer++; break;
3242 /* If there was a retry message key, implying that previously there
3243 was a message-specific defer, we don't want to update the list of
3244 messages waiting for these hosts. */
3246 if (retry_message_key != NULL) update_waiting = FALSE;
3247 continue; /* With the next host or IP address */
3251 /* Second time round the loop: if the address is set but expired, and
3252 the message is newer than the last try, let it through. */
3256 if (host->address == NULL ||
3257 host->status != hstatus_unusable_expired ||
3258 host->last_try > received_time)
3261 debug_printf("trying expired host %s [%s]%s\n",
3262 host->name, host->address, pistring);
3263 host_is_expired = TRUE;
3266 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3267 it remains TRUE only if all hosts are expired and none are actually tried.
3272 /* If this host is listed as one to which access must be serialized,
3273 see if another Exim process has a connection to it, and if so, skip
3274 this host. If not, update the database to record our connection to it
3275 and remember this for later deletion. Do not do any of this if we are
3276 sending the message down a pre-existing connection. */
3279 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3280 host->address, NULL) == OK)
3282 serialize_key = string_sprintf("host-serialize-%s", host->name);
3283 if (!enq_start(serialize_key))
3286 debug_printf("skipping host %s because another Exim process "
3287 "is connected to it\n", host->name);
3294 /* OK, we have an IP address that is not waiting for its retry time to
3295 arrive (it might be expired) OR (second time round the loop) we have an
3296 expired host that hasn't been tried since the message arrived. Have a go
3297 at delivering the message to it. First prepare the addresses by flushing
3298 out the result of previous attempts, and finding the first address that
3299 is still to be delivered. */
3301 first_addr = prepare_addresses(addrlist, host);
3303 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3304 message_id, host->name, host->address, addrlist->address,
3305 (addrlist->next == NULL)? "" : ", ...");
3307 set_process_info("delivering %s to %s [%s] (%s%s)",
3308 message_id, host->name, host->address, addrlist->address,
3309 (addrlist->next == NULL)? "" : ", ...");
3311 /* This is not for real; don't do the delivery. If there are
3312 any remaining hosts, list them. */
3317 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3318 for (addr = addrlist; addr != NULL; addr = addr->next)
3320 addr->host_used = host;
3321 addr->special_action = '*';
3322 addr->message = US"delivery bypassed by -N option";
3326 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3327 "*** host and remaining hosts:\n", tblock->name);
3328 for (host2 = host; host2 != NULL; host2 = host2->next)
3329 debug_printf(" %s [%s]\n", host2->name,
3330 (host2->address == NULL)? US"unset" : host2->address);
3335 /* This is for real. If the host is expired, we don't count it for
3336 hosts_max_retry. This ensures that all hosts must expire before an address
3337 is timed out, unless hosts_max_try_hardlimit (which protects against
3338 lunatic DNS configurations) is reached.
3340 If the host is not expired and we are about to hit the hosts_max_retry
3341 limit, check to see if there is a subsequent hosts with a different MX
3342 value. If so, make that the next host, and don't count this one. This is a
3343 heuristic to make sure that different MXs do get tried. With a normal kind
3344 of retry rule, they would get tried anyway when the earlier hosts were
3345 delayed, but if the domain has a "retry every time" type of rule - as is
3346 often used for the the very large ISPs, that won't happen. */
3350 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3354 debug_printf("hosts_max_try limit reached with this host\n");
3355 for (h = host; h != NULL; h = h->next)
3356 if (h->mx != host->mx) break;
3360 unexpired_hosts_tried--;
3361 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3362 "and will be tried\n");
3366 /* Attempt the delivery. */
3368 total_hosts_tried++;
3369 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3370 expanded_hosts != NULL, &message_defer, FALSE);
3373 OK => connection made, each address contains its result;
3374 message_defer is set for message-specific defers (when all
3375 recipients are marked defer)
3376 DEFER => there was a non-message-specific delivery problem;
3377 ERROR => there was a problem setting up the arguments for a filter,
3378 or there was a problem with expanding added headers
3381 /* If the result is not OK, there was a non-message-specific problem.
3382 If the result is DEFER, we need to write to the logs saying what happened
3383 for this particular host, except in the case of authentication and TLS
3384 failures, where the log has already been written. If all hosts defer a
3385 general message is written at the end. */
3387 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3388 first_addr->basic_errno != ERRNO_TLSFAILURE)
3389 write_logs(first_addr, host);
3391 #ifdef EXPERIMENTAL_EVENT
3393 deferred_event_raise(first_addr, host);
3396 /* If STARTTLS was accepted, but there was a failure in setting up the
3397 TLS session (usually a certificate screwup), and the host is not in
3398 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3399 TLS forcibly turned off. We have to start from scratch with a new SMTP
3400 connection. That's why the retry is done from here, not from within
3401 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3402 session, so the in-clear transmission after those errors, if permitted,
3403 happens inside smtp_deliver().] */
3407 && first_addr->basic_errno == ERRNO_TLSFAILURE
3408 && ob->tls_tempfail_tryclear
3409 && verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3410 host->address, NULL) != OK
3413 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3414 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3415 first_addr = prepare_addresses(addrlist, host);
3416 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3417 expanded_hosts != NULL, &message_defer, TRUE);
3418 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3419 write_logs(first_addr, host);
3420 # ifdef EXPERIMENTAL_EVENT
3422 deferred_event_raise(first_addr, host);
3425 #endif /*SUPPORT_TLS*/
3428 /* Delivery attempt finished */
3430 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3433 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3434 message_id, host->name, host->address, addrlist->address,
3435 (addrlist->next == NULL)? "" : " (& others)", rs);
3437 /* Release serialization if set up */
3439 if (serialized) enq_end(serialize_key);
3441 /* If the result is DEFER, or if a host retry record is known to exist, we
3442 need to add an item to the retry chain for updating the retry database
3443 at the end of delivery. We only need to add the item to the top address,
3444 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3445 for any other delivery attempts using the same address. (It is copied into
3446 the unusable tree at the outer level, so even if different address blocks
3447 contain the same address, it still won't get tried again.) */
3449 if (rc == DEFER || retry_host_key != NULL)
3451 int delete_flag = (rc != DEFER)? rf_delete : 0;
3452 if (retry_host_key == NULL)
3455 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3456 US"retry_include_ip_address", ob->retry_include_ip_address,
3457 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3458 incl_ip = TRUE; /* error; use most-specific retry record */
3460 retry_host_key = incl_ip ?
3461 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3462 string_sprintf("T:%S%s", host->name, pistring);
3465 /* If a delivery of another message over an existing SMTP connection
3466 yields DEFER, we do NOT set up retry data for the host. This covers the
3467 case when there are delays in routing the addresses in the second message
3468 that are so long that the server times out. This is alleviated by not
3469 routing addresses that previously had routing defers when handling an
3470 existing connection, but even so, this case may occur (e.g. if a
3471 previously happily routed address starts giving routing defers). If the
3472 host is genuinely down, another non-continued message delivery will
3473 notice it soon enough. */
3475 if (delete_flag != 0 || !continuing)
3476 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3478 /* We may have tried an expired host, if its retry time has come; ensure
3479 the status reflects the expiry for the benefit of any other addresses. */
3483 host->status = (host_is_expired)?
3484 hstatus_unusable_expired : hstatus_unusable;
3485 host->why = hwhy_deferred;
3489 /* If message_defer is set (host was OK, but every recipient got deferred
3490 because of some message-specific problem), or if that had happened
3491 previously so that a message retry key exists, add an appropriate item
3492 to the retry chain. Note that if there was a message defer but now there is
3493 a host defer, the message defer record gets deleted. That seems perfectly
3494 reasonable. Also, stop the message from being remembered as waiting
3495 for specific hosts. */
3497 if (message_defer || retry_message_key != NULL)
3499 int delete_flag = message_defer? 0 : rf_delete;
3500 if (retry_message_key == NULL)
3503 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3504 US"retry_include_ip_address", ob->retry_include_ip_address,
3505 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3506 incl_ip = TRUE; /* error; use most-specific retry record */
3508 retry_message_key = incl_ip ?
3509 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3511 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3513 retry_add_item(addrlist, retry_message_key,
3514 rf_message | rf_host | delete_flag);
3515 update_waiting = FALSE;
3518 /* Any return other than DEFER (that is, OK or ERROR) means that the
3519 addresses have got their final statuses filled in for this host. In the OK
3520 case, see if any of them are deferred. */
3524 for (addr = addrlist; addr != NULL; addr = addr->next)
3526 if (addr->transport_return == DEFER)
3528 some_deferred = TRUE;
3534 /* If no addresses deferred or the result was ERROR, return. We do this for
3535 ERROR because a failing filter set-up or add_headers expansion is likely to
3536 fail for any host we try. */
3538 if (rc == ERROR || (rc == OK && !some_deferred))
3540 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3541 return TRUE; /* Each address has its status */
3544 /* If the result was DEFER or some individual addresses deferred, let
3545 the loop run to try other hosts with the deferred addresses, except for the
3546 case when we were trying to deliver down an existing channel and failed.
3547 Don't try any other hosts in this case. */
3549 if (continuing) break;
3551 /* If the whole delivery, or some individual addresses, were deferred and
3552 there are more hosts that could be tried, do not count this host towards
3553 the hosts_max_try limit if the age of the message is greater than the
3554 maximum retry time for this host. This means we may try try all hosts,
3555 ignoring the limit, when messages have been around for some time. This is
3556 important because if we don't try all hosts, the address will never time
3557 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3559 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3562 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3564 if (retry != NULL && retry->rules != NULL)
3566 retry_rule *last_rule;
3567 for (last_rule = retry->rules;
3568 last_rule->next != NULL;
3569 last_rule = last_rule->next);
3570 timedout = time(NULL) - received_time > last_rule->timeout;
3572 else timedout = TRUE; /* No rule => timed out */
3576 unexpired_hosts_tried--;
3577 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3578 "hosts_max_try (message older than host's retry time)\n");
3581 } /* End of loop for trying multiple hosts. */
3583 /* This is the end of the loop that repeats iff expired is TRUE and
3584 ob->delay_after_cutoff is FALSE. The second time round we will
3585 try those hosts that haven't been tried since the message arrived. */
3589 debug_printf("all IP addresses skipped or deferred at least one address\n");
3590 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3591 debug_printf("retrying IP addresses not tried since message arrived\n");
3596 /* Get here if all IP addresses are skipped or defer at least one address. In
3597 MUA wrapper mode, this will happen only for connection or other non-message-
3598 specific failures. Force the delivery status for all addresses to FAIL. */
3602 for (addr = addrlist; addr != NULL; addr = addr->next)
3603 addr->transport_return = FAIL;
3607 /* In the normal, non-wrapper case, add a standard message to each deferred
3608 address if there hasn't been an error, that is, if it hasn't actually been
3609 tried this time. The variable "expired" will be FALSE if any deliveries were
3610 actually tried, or if there was at least one host that was not expired. That
3611 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3612 a delivery has been tried, an error code will be set, and the failing of the
3613 message is handled by the retry code later.
3615 If queue_smtp is set, or this transport was called to send a subsequent message
3616 down an existing TCP/IP connection, and something caused the host not to be
3617 found, we end up here, but can detect these cases and handle them specially. */
3619 for (addr = addrlist; addr != NULL; addr = addr->next)
3621 /* If host is not NULL, it means that we stopped processing the host list
3622 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3623 means we need to behave as if some hosts were skipped because their retry
3624 time had not come. Specifically, this prevents the address from timing out.
3625 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3626 hosts were tried. */
3630 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3633 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3634 "hosts were tried\n");
3639 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3640 setflag(addr, af_retry_skipped);
3644 if (queue_smtp) /* no deliveries attempted */
3646 addr->transport_return = DEFER;
3647 addr->basic_errno = 0;
3648 addr->message = US"SMTP delivery explicitly queued";
3651 else if (addr->transport_return == DEFER &&
3652 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3653 addr->message == NULL)
3655 addr->basic_errno = ERRNO_HRETRY;
3656 if (continue_hostname != NULL)
3658 addr->message = US"no host found for existing SMTP connection";
3662 setflag(addr, af_pass_message); /* This is not a security risk */
3663 addr->message = (ob->delay_after_cutoff)?
3664 US"retry time not reached for any host after a long failure period" :
3665 US"all hosts have been failing for a long time and were last tried "
3666 "after this message arrived";
3668 /* If we are already using fallback hosts, or there are no fallback hosts
3669 defined, convert the result to FAIL to cause a bounce. */
3671 if (addr->host_list == addr->fallback_hosts ||
3672 addr->fallback_hosts == NULL)
3673 addr->transport_return = FAIL;
3677 if (hosts_retry == hosts_total)
3678 addr->message = US"retry time not reached for any host";
3679 else if (hosts_fail == hosts_total)
3680 addr->message = US"all host address lookups failed permanently";
3681 else if (hosts_defer == hosts_total)
3682 addr->message = US"all host address lookups failed temporarily";
3683 else if (hosts_serial == hosts_total)
3684 addr->message = US"connection limit reached for all hosts";
3685 else if (hosts_fail+hosts_defer == hosts_total)
3686 addr->message = US"all host address lookups failed";
3687 else addr->message = US"some host address lookups failed and retry time "
3688 "not reached for other hosts or connection limit reached";
3693 /* Update the database which keeps information about which messages are waiting
3694 for which hosts to become available. For some message-specific errors, the
3695 update_waiting flag is turned off because we don't want follow-on deliveries in
3696 those cases. If this transport instance is explicitly limited to one message
3697 per connection then follow-on deliveries are not possible and there's no need
3698 to create/update the per-transport wait-<transport_name> database. */
3700 if (update_waiting && tblock->connection_max_messages != 1)
3701 transport_update_waiting(hostlist, tblock->name);
3705 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3707 return TRUE; /* Each address has its status */
3712 /* End of transport/smtp.c */