1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
252 #ifdef EXPERIMENTAL_SOCKS
253 ,NULL /* socks_proxy */
256 ,NULL, /* tls_certificate */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
282 /* some DSN flags for use later */
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
317 Returns: OK always (FAIL, DEFER not used)
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
327 errmsg = errmsg; /* Keep picky compilers happy */
331 /* Pass back options if required. This interface is getting very messy. */
335 tf->interface = ob->interface;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
351 if (!testflag(addrlist, af_local_host_removed))
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
371 Argument: pointer to the transport instance block
376 smtp_transport_init(transport_instance *tblock)
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
381 /* Retry_use_local_part defaults FALSE if unset */
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
386 /* Set the default port according to the protocol */
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392 /* Set up the setup entry point, to be called before subprocesses for this
395 tblock->setup = smtp_transport_setup;
397 /* Complain if any of the timeouts are zero. */
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
476 if (pass_message) setflag(addr, af_pass_message);
478 addr->transport_return = rc;
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
541 *yield = '4'; /* Default setting is to give a temporary error */
543 /* Handle response timeout */
545 if (*errno_value == ETIMEDOUT)
547 *message = US string_sprintf("SMTP timeout after %s%s",
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
555 /* Handle malformed SMTP response */
557 if (*errno_value == ERRNO_SMTPFORMAT)
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
572 if (*errno_value == ERRNO_FILTER_FAIL)
574 *message = US string_sprintf("transport filter process failed (%d)%s",
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
591 /* Handle failure to write a complete data block */
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
595 *message = US string_sprintf("failed to write a data block");
599 #ifdef EXPERIMENTAL_INTERNATIONAL
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
609 /* Handle error responses from the remote mailer. */
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
644 /* This writes to the main log and to the message log.
647 addr the address item containing error information
648 host the current host
654 write_logs(address_item *addr, host_item *host)
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
660 message = string_sprintf("%s: %s", message, addr->message);
661 if (addr->basic_errno > 0)
662 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
663 log_write(0, LOG_MAIN, "%s", message);
664 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 if (LOGGING(outgoing_port))
669 message = string_sprintf("%s:%d", message,
670 host->port == PORT_NONE ? 25 : host->port);
671 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
672 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
673 strerror(addr->basic_errno));
678 msglog_line(host_item * host, uschar * message)
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
686 #ifdef EXPERIMENTAL_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
695 addr the address item containing error information
696 host the current host
702 deferred_event_raise(address_item *addr, host_item *host)
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
724 (void) event_raise(action, US"msg:host:defer",
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
797 address_item *addr = *sync_addr;
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
812 uschar flushbuffer[4096];
814 if (buffer[0] == '4')
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
823 && (errno != 0 || flushbuffer[0] == 0))
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
850 /* The address was accepted */
851 addr->host_used = host;
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
856 addr->transport_return = PENDING_OK;
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
862 if (testflag(addr, af_dr_retry_exists))
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
871 /* Timeout while reading the response */
873 else if (errno == ETIMEDOUT)
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
888 else if (errno != 0 || buffer[0] == 0)
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
895 /* Handle SMTP permanent and temporary response codes. */
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
906 /* The response was 5xx */
908 if (buffer[0] == '5')
910 addr->transport_return = FAIL;
914 /* The response was 4xx */
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
922 /* Log temporary errors if there are more hosts to be tried.
923 If not, log this last one in the == line. */
926 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
928 /* Do not put this message on the list of those waiting for specific
929 hosts, as otherwise it is likely to be tried too often. */
931 update_waiting = FALSE;
933 /* Add a retry item for the address so that it doesn't get tried again
934 too soon. If address_retry_include_sender is true, add the sender address
937 if (address_retry_include_sender)
939 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
941 retry_add_item(addr, altkey, 0);
943 else retry_add_item(addr, addr->address_retry_key, 0);
946 } /* Loop for next RCPT response */
948 /* Update where to start at for the next block of responses, unless we
949 have already handled all the addresses. */
951 if (addr != NULL) *sync_addr = addr->next;
953 /* Handle a response to DATA. If we have not had any good recipients, either
954 previously or in this block, the response is ignored. */
956 if (pending_DATA != 0 &&
957 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
962 if (pending_DATA > 0 || (yield & 1) != 0)
964 if (errno == 0 && buffer[0] == '4')
966 errno = ERRNO_DATA4XX;
967 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
971 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
972 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
973 "is in use and there were no good recipients\n", msg);
976 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
977 present) received 3xx. If any RCPTs were handled and yielded anything other
978 than 4xx, yield will be set non-zero. */
985 /* Do the client side of smtp-level authentication */
988 buffer EHLO response from server (gets overwritten)
989 addrlist chain of potential addresses to deliver
990 host host to deliver to
992 ibp, obp comms channel control blocks
995 OK Success, or failed (but not required): global "smtp_authenticated" set
996 DEFER Failed authentication (and was required)
997 ERROR Internal problem
999 FAIL_SEND Failed communications - transmit
1004 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1005 smtp_transport_options_block *ob, BOOL is_esmtp,
1006 smtp_inblock *ibp, smtp_outblock *obp)
1009 uschar *fail_reason = US"server did not advertise AUTH support";
1011 smtp_authenticated = FALSE;
1012 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1013 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1015 if (is_esmtp && !regex_AUTH) regex_AUTH =
1016 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1019 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1021 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1022 expand_nmax = -1; /* reset */
1024 /* Must not do this check until after we have saved the result of the
1025 regex match above. */
1027 if (require_auth == OK ||
1028 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1031 fail_reason = US"no common mechanisms were found";
1033 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1035 /* Scan the configured authenticators looking for one which is configured
1036 for use as a client, which is not suppressed by client_condition, and
1037 whose name matches an authentication mechanism supported by the server.
1038 If one is found, attempt to authenticate by calling its client function.
1041 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1045 (au->client_condition != NULL &&
1046 !expand_check_condition(au->client_condition, au->name,
1047 US"client authenticator")))
1049 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1051 (au->client)? "client_condition is false" :
1052 "not configured as a client");
1056 /* Loop to scan supported server mechanisms */
1061 int len = Ustrlen(au->public_name);
1062 while (isspace(*p)) p++;
1064 if (strncmpic(au->public_name, p, len) != 0 ||
1065 (p[len] != 0 && !isspace(p[len])))
1067 while (*p != 0 && !isspace(*p)) p++;
1071 /* Found data for a listed mechanism. Call its client entry. Set
1072 a flag in the outblock so that data is overwritten after sending so
1073 that reflections don't show it. */
1075 fail_reason = US"authentication attempt(s) failed";
1076 obp->authenticating = TRUE;
1077 rc = (au->info->clientcode)(au, ibp, obp,
1078 ob->command_timeout, buffer, bufsize);
1079 obp->authenticating = FALSE;
1080 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1083 /* A temporary authentication failure must hold up delivery to
1084 this host. After a permanent authentication failure, we carry on
1085 to try other authentication methods. If all fail hard, try to
1086 deliver the message unauthenticated unless require_auth was set. */
1091 smtp_authenticated = TRUE; /* stops the outer loop */
1092 client_authenticator = au->name;
1093 if (au->set_client_id != NULL)
1094 client_authenticated_id = expand_string(au->set_client_id);
1097 /* Failure after writing a command */
1102 /* Failure after reading a response */
1105 if (errno != 0 || buffer[0] != '5') return FAIL;
1106 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1107 au->name, host->name, host->address, buffer);
1110 /* Failure by some other means. In effect, the authenticator
1111 decided it wasn't prepared to handle this case. Typically this
1112 is the result of "fail" in an expansion string. Do we need to
1113 log anything here? Feb 2006: a message is now put in the buffer
1114 if logging is required. */
1118 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1119 "authentication H=%s [%s] %s", au->name, host->name,
1120 host->address, buffer);
1123 /* Internal problem, message in buffer. */
1126 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1131 break; /* If not authenticated, try next authenticator */
1132 } /* Loop for scanning supported server mechanisms */
1133 } /* Loop for further authenticators */
1137 /* If we haven't authenticated, but are required to, give up. */
1139 if (require_auth == OK && !smtp_authenticated)
1141 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1142 string_sprintf("authentication required but %s", fail_reason), DEFER,
1151 /* Construct AUTH appendix string for MAIL TO */
1154 buffer to build string
1155 addrlist chain of potential addresses to deliver
1156 ob transport options
1158 Globals smtp_authenticated
1159 client_authenticated_sender
1160 Return True on error, otherwise buffer has (possibly empty) terminated string
1164 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1165 smtp_transport_options_block *ob)
1167 uschar *local_authenticated_sender = authenticated_sender;
1170 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1173 if (ob->authenticated_sender != NULL)
1175 uschar *new = expand_string(ob->authenticated_sender);
1178 if (!expand_string_forcedfail)
1180 uschar *message = string_sprintf("failed to expand "
1181 "authenticated_sender: %s", expand_string_message);
1182 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1186 else if (new[0] != 0) local_authenticated_sender = new;
1189 /* Add the authenticated sender address if present */
1191 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1192 local_authenticated_sender != NULL)
1194 string_format(buffer, bufsize, " AUTH=%s",
1195 auth_xtextencode(local_authenticated_sender,
1196 Ustrlen(local_authenticated_sender)));
1197 client_authenticated_sender = string_copy(local_authenticated_sender);
1207 #ifdef EXPERIMENTAL_DANE
1209 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1210 BOOL dane_required, BOOL * dane)
1212 /* move this out to host.c given the similarity to dns_lookup() ? */
1214 const uschar * fullname = buffer;
1216 /* TLSA lookup string */
1217 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1219 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1222 return DEFER; /* just defer this TLS'd conn */
1231 if (!dns_is_secure(dnsa))
1233 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1245 typedef struct smtp_compare_s
1247 uschar *current_sender_address;
1248 struct transport_instance *tblock;
1252 Create a unique string that identifies this message, it is based on
1253 sender_address, helo_data and tls_certificate if enabled. */
1256 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1258 address_item * addr1;
1259 uschar * if1 = US"";
1260 uschar * helo1 = US"";
1262 uschar * tlsc1 = US"";
1264 uschar * save_sender_address = sender_address;
1265 uschar * local_identity = NULL;
1266 smtp_transport_options_block * ob =
1267 (smtp_transport_options_block *)tblock->options_block;
1269 sender_address = sender;
1271 addr1 = deliver_make_addr (sender, TRUE);
1272 deliver_set_expansions(addr1);
1275 if1 = expand_string(ob->interface);
1278 helo1 = expand_string(ob->helo_data);
1281 if (ob->tls_certificate)
1282 tlsc1 = expand_string(ob->tls_certificate);
1283 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1285 local_identity = string_sprintf ("%s^%s", if1, helo1);
1288 deliver_set_expansions(NULL);
1289 sender_address = save_sender_address;
1291 return local_identity;
1296 /* This routine is a callback that is called from transport_check_waiting.
1297 This function will evaluate the incoming message versus the previous
1298 message. If the incoming message is using a different local identity then
1299 we will veto this new message. */
1302 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1305 uschar * message_local_identity,
1306 * current_local_identity,
1307 * new_sender_address;
1309 current_local_identity =
1310 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1312 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1315 message_local_identity =
1316 smtp_local_identity(new_sender_address, s_compare->tblock);
1318 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1323 /*************************************************
1324 * Deliver address list to given host *
1325 *************************************************/
1327 /* If continue_hostname is not null, we get here only when continuing to
1328 deliver down an existing channel. The channel was passed as the standard
1329 input. TLS is never active on a passed channel; the previous process always
1330 closes it down before passing the connection on.
1332 Otherwise, we have to make a connection to the remote host, and do the
1333 initial protocol exchange.
1335 When running as an MUA wrapper, if the sender or any recipient is rejected,
1336 temporarily or permanently, we force failure for all recipients.
1339 addrlist chain of potential addresses to deliver; only those whose
1340 transport_return field is set to PENDING_DEFER are currently
1341 being processed; others should be skipped - they have either
1342 been delivered to an earlier host or IP address, or been
1343 failed by one of them.
1344 host host to deliver to
1345 host_af AF_INET or AF_INET6
1346 port default TCP/IP port to use, in host byte order
1347 interface interface to bind to, or NULL
1348 tblock transport instance block
1349 message_defer set TRUE if yield is OK, but all addresses were deferred
1350 because of a non-recipient, non-host failure, that is, a
1351 4xx response to MAIL FROM, DATA, or ".". This is a defer
1352 that is specific to the message.
1353 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1354 a second attempt after TLS initialization fails
1356 Returns: OK - the connection was made and the delivery attempted;
1357 the result for each address is in its data block.
1358 DEFER - the connection could not be made, or something failed
1359 while setting up the SMTP session, or there was a
1360 non-message-specific error, such as a timeout.
1361 ERROR - a filter command is specified for this transport,
1362 and there was a problem setting it up; OR helo_data
1363 or add_headers or authenticated_sender is specified
1364 for this transport, and the string failed to expand
1368 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1369 uschar *interface, transport_instance *tblock,
1370 BOOL *message_defer, BOOL suppress_tls)
1373 address_item *sync_addr;
1374 address_item *first_addr = addrlist;
1379 time_t start_delivery_time = time(NULL);
1380 smtp_transport_options_block *ob =
1381 (smtp_transport_options_block *)(tblock->options_block);
1382 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1383 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1385 BOOL send_rset = TRUE;
1386 BOOL send_quit = TRUE;
1387 BOOL setting_up = TRUE;
1388 BOOL completed_address = FALSE;
1391 BOOL pass_message = FALSE;
1392 #ifndef DISABLE_PRDR
1393 BOOL prdr_offered = FALSE;
1396 #ifdef EXPERIMENTAL_INTERNATIONAL
1397 BOOL utf8_needed = FALSE;
1398 BOOL utf8_offered = FALSE;
1400 BOOL dsn_all_lasthop = TRUE;
1401 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1403 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1404 dns_answer tlsa_dnsa;
1406 smtp_inblock inblock;
1407 smtp_outblock outblock;
1408 int max_rcpt = tblock->max_addresses;
1409 uschar *igquotstr = US"";
1411 #ifdef EXPERIMENTAL_DSN_INFO
1412 uschar *smtp_greeting = NULL;
1413 uschar *helo_response = NULL;
1415 uschar *helo_data = NULL;
1417 uschar *message = NULL;
1418 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1420 uschar buffer[4096];
1421 uschar inbuffer[4096];
1422 uschar outbuffer[4096];
1424 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1426 *message_defer = FALSE;
1427 smtp_command = US"initial connection";
1428 if (max_rcpt == 0) max_rcpt = 999999;
1430 /* Set up the buffer for reading SMTP response packets. */
1432 inblock.buffer = inbuffer;
1433 inblock.buffersize = sizeof(inbuffer);
1434 inblock.ptr = inbuffer;
1435 inblock.ptrend = inbuffer;
1437 /* Set up the buffer for holding SMTP commands while pipelining */
1439 outblock.buffer = outbuffer;
1440 outblock.buffersize = sizeof(outbuffer);
1441 outblock.ptr = outbuffer;
1442 outblock.cmd_count = 0;
1443 outblock.authenticating = FALSE;
1445 /* Reset the parameters of a TLS session. */
1448 tls_out.cipher = NULL; /* the one we may use for this transport */
1449 tls_out.ourcert = NULL;
1450 tls_out.peercert = NULL;
1451 tls_out.peerdn = NULL;
1452 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1455 tls_out.ocsp = OCSP_NOT_REQ;
1457 /* Flip the legacy TLS-related variables over to the outbound set in case
1458 they're used in the context of the transport. Don't bother resetting
1459 afterward as we're in a subprocess. */
1461 tls_modify_variables(&tls_out);
1466 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1472 /* Make a connection to the host if this isn't a continued delivery, and handle
1473 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1474 specially so they can be identified for retries. */
1476 if (continue_hostname == NULL)
1478 /* This puts port into host->port */
1479 inblock.sock = outblock.sock =
1480 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1482 if (inblock.sock < 0)
1484 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1485 NULL, DEFER, FALSE);
1489 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1491 tls_out.dane_verified = FALSE;
1492 tls_out.tlsa_usage = 0;
1494 if (host->dnssec == DS_YES)
1497 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1499 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1500 && dane_required /* do not error on only dane-requested */
1503 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1504 string_sprintf("DANE error: tlsa lookup %s",
1505 rc == DEFER ? "DEFER" : "FAIL"),
1510 else if (dane_required)
1512 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1513 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1519 ob->tls_tempfail_tryclear = FALSE;
1523 /* Expand the greeting message while waiting for the initial response. (Makes
1524 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1525 delayed till here so that $sending_interface and $sending_port are set. */
1527 helo_data = expand_string(ob->helo_data);
1528 #ifdef EXPERIMENTAL_INTERNATIONAL
1531 uschar * errstr = NULL;
1532 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1534 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1535 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1542 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1543 is nevertheless a reasonably clean way of programming this kind of logic,
1544 where you want to escape on any error. */
1548 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1549 '2', ob->command_timeout);
1550 #ifdef EXPERIMENTAL_DSN_INFO
1551 smtp_greeting = string_copy(buffer);
1553 if (!good_response) goto RESPONSE_FAILED;
1555 #ifdef EXPERIMENTAL_EVENT
1558 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1559 : host->dnssec==DS_NO ? US"no" : NULL;
1560 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1563 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1564 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1572 /* Now check if the helo_data expansion went well, and sign off cleanly if
1575 if (helo_data == NULL)
1577 uschar *message = string_sprintf("failed to expand helo_data: %s",
1578 expand_string_message);
1579 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1585 /** Debugging without sending a message
1586 addrlist->transport_return = DEFER;
1590 /* Errors that occur after this point follow an SMTP command, which is
1591 left in big_buffer by smtp_write_command() for use in error messages. */
1593 smtp_command = big_buffer;
1595 /* Tell the remote who we are...
1597 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1598 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1599 greeting is of this form. The assumption was that the far end supports it
1600 properly... but experience shows that there are some that give 5xx responses,
1601 even though the banner includes "ESMTP" (there's a bloody-minded one that
1602 says "ESMTP not spoken here"). Cope with that case.
1604 September 2000: Time has passed, and it seems reasonable now to always send
1605 EHLO at the start. It is also convenient to make the change while installing
1608 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1609 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1610 would be no way to send out the mails, so there is now a host list
1611 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1612 PIPELINING problem as well. Maybe it can also be useful to cure other
1613 problems with broken servers.
1615 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1616 Then somebody tried it with a Microsoft mailer... It seems that all other
1617 mailers use upper case for some reason (the RFC is quite clear about case
1618 independence) so, for peace of mind, I gave in. */
1620 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1622 /* Alas; be careful, since this goto is not an error-out, so conceivably
1623 we might set data between here and the target which we assume to exist
1624 and be usable. I can see this coming back to bite us. */
1629 suppress_tls = FALSE;
1630 ob->tls_tempfail_tryclear = FALSE;
1631 smtp_command = US"SSL-on-connect";
1638 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1639 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1641 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1642 ob->command_timeout))
1644 if (errno != 0 || buffer[0] == 0 || lmtp)
1646 #ifdef EXPERIMENTAL_DSN_INFO
1647 helo_response = string_copy(buffer);
1649 goto RESPONSE_FAILED;
1653 #ifdef EXPERIMENTAL_DSN_INFO
1654 helo_response = string_copy(buffer);
1660 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1667 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1669 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1670 '2', ob->command_timeout);
1671 #ifdef EXPERIMENTAL_DSN_INFO
1672 helo_response = string_copy(buffer);
1674 if (!good_response) goto RESPONSE_FAILED;
1677 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1678 lmtp_ignore_quota option was set. */
1680 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1681 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1682 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1684 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1687 tls_offered = esmtp &&
1688 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1689 PCRE_EOPT, NULL, 0) >= 0;
1692 #ifndef DISABLE_PRDR
1693 prdr_offered = esmtp
1694 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1695 PCRE_EOPT, NULL, 0) >= 0
1696 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1699 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1702 #ifdef EXPERIMENTAL_INTERNATIONAL
1703 if (addrlist->prop.utf8_msg)
1705 utf8_needed = !addrlist->prop.utf8_downcvt
1706 && !addrlist->prop.utf8_downcvt_maybe;
1707 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1708 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1710 utf8_offered = esmtp
1711 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1712 PCRE_EOPT, NULL, 0) >= 0;
1717 /* For continuing deliveries down the same channel, the socket is the standard
1718 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1719 below). Set up the pointer to where subsequent commands will be left, for
1720 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1721 set from the command line if they were set in the process that passed the
1724 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1725 as the contine goes via transport_pass_socket() and doublefork and exec.
1726 It does not wait. Unclear how we keep separate host's responses
1727 separate - we could match up by host ip+port as a bodge. */
1731 inblock.sock = outblock.sock = fileno(stdin);
1732 smtp_command = big_buffer;
1733 host->port = port; /* Record the port that was used */
1736 /* If TLS is available on this connection, whether continued or not, attempt to
1737 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1738 send another EHLO - the server may give a different answer in secure mode. We
1739 use a separate buffer for reading the response to STARTTLS so that if it is
1740 negative, the original EHLO data is available for subsequent analysis, should
1741 the client not be required to use TLS. If the response is bad, copy the buffer
1742 for error analysis. */
1747 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1749 uschar buffer2[4096];
1750 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1753 /* If there is an I/O error, transmission of this message is deferred. If
1754 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1755 false, we also defer. However, if there is a temporary rejection of STARTTLS
1756 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1757 STARTTLS, we carry on. This means we will try to send the message in clear,
1758 unless the host is in hosts_require_tls (tested below). */
1760 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1761 ob->command_timeout))
1763 if (errno != 0 || buffer2[0] == 0 ||
1764 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1766 Ustrncpy(buffer, buffer2, sizeof(buffer));
1767 goto RESPONSE_FAILED;
1771 /* STARTTLS accepted: try to negotiate a TLS session. */
1776 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1777 # ifdef EXPERIMENTAL_DANE
1778 , dane ? &tlsa_dnsa : NULL
1782 /* TLS negotiation failed; give an error. From outside, this function may
1783 be called again to try in clear on a new connection, if the options permit
1784 it for this host. */
1788 # ifdef EXPERIMENTAL_DANE
1789 if (rc == DEFER && dane && !dane_required)
1791 log_write(0, LOG_MAIN, "DANE attempt failed;"
1792 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1793 host->name, host->address);
1799 save_errno = ERRNO_TLSFAILURE;
1800 message = US"failure while setting up TLS session";
1805 /* TLS session is set up */
1807 for (addr = addrlist; addr; addr = addr->next)
1808 if (addr->transport_return == PENDING_DEFER)
1810 addr->cipher = tls_out.cipher;
1811 addr->ourcert = tls_out.ourcert;
1812 addr->peercert = tls_out.peercert;
1813 addr->peerdn = tls_out.peerdn;
1814 addr->ocsp = tls_out.ocsp;
1819 /* if smtps, we'll have smtp_command set to something else; always safe to
1821 smtp_command = big_buffer;
1823 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1824 helo_data is null, we are dealing with a connection that was passed from
1825 another process, and so we won't have expanded helo_data above. We have to
1826 expand it here. $sending_ip_address and $sending_port are set up right at the
1827 start of the Exim process (in exim.c). */
1829 if (tls_out.active >= 0)
1834 if (helo_data == NULL)
1836 helo_data = expand_string(ob->helo_data);
1837 if (helo_data == NULL)
1839 uschar *message = string_sprintf("failed to expand helo_data: %s",
1840 expand_string_message);
1841 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1847 /* For SMTPS we need to wait for the initial OK response. */
1850 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1851 '2', ob->command_timeout);
1852 #ifdef EXPERIMENTAL_DSN_INFO
1853 smtp_greeting = string_copy(buffer);
1855 if (!good_response) goto RESPONSE_FAILED;
1859 greeting_cmd = "EHLO";
1862 greeting_cmd = "HELO";
1864 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1867 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1868 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1870 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1871 '2', ob->command_timeout);
1872 #ifdef EXPERIMENTAL_DSN_INFO
1873 helo_response = string_copy(buffer);
1875 if (!good_response) goto RESPONSE_FAILED;
1878 /* If the host is required to use a secure channel, ensure that we
1882 # ifdef EXPERIMENTAL_DANE
1885 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1888 save_errno = ERRNO_TLSREQUIRED;
1889 message = string_sprintf("a TLS session is required, but %s",
1890 tls_offered? "an attempt to start TLS failed" :
1891 "the server did not offer TLS support");
1894 #endif /*SUPPORT_TLS*/
1896 /* If TLS is active, we have just started it up and re-done the EHLO command,
1897 so its response needs to be analyzed. If TLS is not active and this is a
1898 continued session down a previously-used socket, we haven't just done EHLO, so
1901 if (continue_hostname == NULL
1903 || tls_out.active >= 0
1907 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1908 lmtp_ignore_quota option was set. */
1910 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1911 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1912 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1914 /* If the response to EHLO specified support for the SIZE parameter, note
1915 this, provided size_addition is non-negative. */
1917 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1918 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1919 PCRE_EOPT, NULL, 0) >= 0;
1921 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1922 the current host, esmtp will be false, so PIPELINING can never be used. If
1923 the current host matches hosts_avoid_pipelining, don't do it. */
1925 smtp_use_pipelining = esmtp
1926 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1927 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1928 PCRE_EOPT, NULL, 0) >= 0;
1930 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1931 smtp_use_pipelining? "" : "not ");
1933 #ifndef DISABLE_PRDR
1934 prdr_offered = esmtp
1935 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1936 PCRE_EOPT, NULL, 0) >= 0
1937 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1940 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1943 #ifdef EXPERIMENTAL_INTERNATIONAL
1944 if (addrlist->prop.utf8_msg)
1945 utf8_offered = esmtp
1946 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1947 PCRE_EOPT, NULL, 0) >= 0;
1950 /* Note if the server supports DSN */
1951 smtp_use_dsn = esmtp
1952 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1953 PCRE_EOPT, NULL, 0) >= 0;
1954 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1956 /* Note if the response to EHLO specifies support for the AUTH extension.
1957 If it has, check that this host is one we want to authenticate to, and do
1958 the business. The host name and address must be available when the
1959 authenticator's client driver is running. */
1961 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1962 ob, esmtp, &inblock, &outblock))
1964 default: goto SEND_QUIT;
1966 case FAIL_SEND: goto SEND_FAILED;
1967 case FAIL: goto RESPONSE_FAILED;
1971 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1972 message-specific. */
1976 #ifdef EXPERIMENTAL_INTERNATIONAL
1977 /* If this is an international message we need the host to speak SMTPUTF8 */
1978 if (utf8_needed && !utf8_offered)
1980 errno = ERRNO_UTF8_FWD;
1981 goto RESPONSE_FAILED;
1985 /* If there is a filter command specified for this transport, we can now
1986 set it up. This cannot be done until the identify of the host is known. */
1988 if (tblock->filter_command != NULL)
1992 sprintf(CS buffer, "%.50s transport", tblock->name);
1993 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1994 TRUE, DEFER, addrlist, buffer, NULL);
1995 transport_filter_timeout = tblock->filter_timeout;
1997 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2002 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2010 /* For messages that have more than the maximum number of envelope recipients,
2011 we want to send several transactions down the same SMTP connection. (See
2012 comments in deliver.c as to how this reconciles, heuristically, with
2013 remote_max_parallel.) This optimization was added to Exim after the following
2014 code was already working. The simplest way to put it in without disturbing the
2015 code was to use a goto to jump back to this point when there is another
2016 transaction to handle. */
2019 sync_addr = first_addr;
2023 completed_address = FALSE;
2026 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2027 qualification, send it, adding something to the message size to allow for
2028 imprecision and things that get added en route. Exim keeps the number of lines
2029 in a message, so we can give an accurate value for the original message, but we
2030 need some additional to handle added headers. (Double "." characters don't get
2031 included in the count.) */
2038 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2042 #ifndef DISABLE_PRDR
2043 prdr_active = FALSE;
2046 for (addr = first_addr; addr; addr = addr->next)
2047 if (addr->transport_return == PENDING_DEFER)
2049 for (addr = addr->next; addr; addr = addr->next)
2050 if (addr->transport_return == PENDING_DEFER)
2051 { /* at least two recipients to send */
2053 sprintf(CS p, " PRDR"); p += 5;
2061 #ifdef EXPERIMENTAL_INTERNATIONAL
2062 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
2063 sprintf(CS p, " SMTPUTF8"), p += 9;
2066 /* check if all addresses have lasthop flag */
2067 /* do not send RET and ENVID if true */
2068 for (dsn_all_lasthop = TRUE, addr = first_addr;
2069 address_count < max_rcpt && addr != NULL;
2071 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2073 dsn_all_lasthop = FALSE;
2077 /* Add any DSN flags to the mail command */
2079 if (smtp_use_dsn && !dsn_all_lasthop)
2081 if (dsn_ret == dsn_ret_hdrs)
2083 Ustrcpy(p, " RET=HDRS");
2086 else if (dsn_ret == dsn_ret_full)
2088 Ustrcpy(p, " RET=FULL");
2091 if (dsn_envid != NULL)
2093 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2098 /* If an authenticated_sender override has been specified for this transport
2099 instance, expand it. If the expansion is forced to fail, and there was already
2100 an authenticated_sender for this message, the original value will be used.
2101 Other expansion failures are serious. An empty result is ignored, but there is
2102 otherwise no check - this feature is expected to be used with LMTP and other
2103 cases where non-standard addresses (e.g. without domains) might be required. */
2105 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2111 /* From here until we send the DATA command, we can make use of PIPELINING
2112 if the server host supports it. The code has to be able to check the responses
2113 at any point, for when the buffer fills up, so we write it totally generally.
2114 When PIPELINING is off, each command written reports that it has flushed the
2117 pending_MAIL = TRUE; /* The block starts with MAIL */
2120 uschar * s = return_path;
2121 #ifdef EXPERIMENTAL_INTERNATIONAL
2122 uschar * errstr = NULL;
2124 /* If we must downconvert, do the from-address here. Remember we had to
2125 for the to-addresses (done below), and also (ugly) for re-doing when building
2126 the delivery log line. */
2128 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2130 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2132 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2136 setflag(addrlist, af_utf8_downcvt);
2140 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2141 "MAIL FROM:<%s>%s\r\n", s, buffer);
2144 mail_command = string_copy(big_buffer); /* Save for later error message */
2148 case -1: /* Transmission error */
2151 case +1: /* Block was sent */
2152 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2153 ob->command_timeout))
2155 if (errno == 0 && buffer[0] == '4')
2157 errno = ERRNO_MAIL4XX;
2158 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2160 goto RESPONSE_FAILED;
2162 pending_MAIL = FALSE;
2166 /* Pass over all the relevant recipient addresses for this host, which are the
2167 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2168 several before we have to read the responses for those seen so far. This
2169 checking is done by a subroutine because it also needs to be done at the end.
2170 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2171 the next one if not all are sent.
2173 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2174 last address because we want to abort if any recipients have any kind of
2175 problem, temporary or permanent. We know that all recipient addresses will have
2176 the PENDING_DEFER status, because only one attempt is ever made, and we know
2177 that max_rcpt will be large, so all addresses will be done at once. */
2179 for (addr = first_addr;
2180 address_count < max_rcpt && addr != NULL;
2187 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2189 if (addr->transport_return != PENDING_DEFER) continue;
2192 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2194 /* Add any DSN flags to the rcpt command and add to the sent string */
2199 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2201 if ((addr->dsn_flags & rf_dsnflags) != 0)
2205 Ustrcpy(p, " NOTIFY=");
2207 for (i = 0; i < 4; i++)
2208 if ((addr->dsn_flags & rf_list[i]) != 0)
2210 if (!first) *p++ = ',';
2212 Ustrcpy(p, rf_names[i]);
2217 if (addr->dsn_orcpt != NULL)
2219 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2225 /* Now send the RCPT command, and process outstanding responses when
2226 necessary. After a timeout on RCPT, we just end the function, leaving the
2227 yield as OK, because this error can often mean that there is a problem with
2228 just one address, so we don't want to delay the host. */
2230 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2232 #ifdef EXPERIMENTAL_INTERNATIONAL
2234 uschar * dummy_errstr;
2235 if ( testflag(addrlist, af_utf8_downcvt)
2236 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2240 errno = ERRNO_EXPANDFAIL;
2246 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2247 rcpt_addr, igquotstr, buffer);
2249 if (count < 0) goto SEND_FAILED;
2252 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2253 &sync_addr, host, count, ob->address_retry_include_sender,
2254 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2257 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2258 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2261 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2262 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2263 case 0: /* No 2xx or 5xx, but no probs */
2266 case -1: goto END_OFF; /* Timeout on RCPT */
2267 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2269 pending_MAIL = FALSE; /* Dealt with MAIL */
2271 } /* Loop for next address */
2273 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2274 permanently or temporarily. We should have flushed and synced after the last
2279 address_item *badaddr;
2280 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2281 if (badaddr->transport_return != PENDING_OK)
2283 /*XXX could we find a better errno than 0 here? */
2284 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2285 testflag(badaddr, af_pass_message));
2291 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2292 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2293 have a good recipient buffered up if we are pipelining. We don't want to waste
2294 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2295 are pipelining. The responses are all handled by sync_responses(). */
2297 if (ok || (smtp_use_pipelining && !mua_wrapper))
2299 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2300 if (count < 0) goto SEND_FAILED;
2301 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2302 host, count, ob->address_retry_include_sender, pending_MAIL,
2303 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2305 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2306 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2309 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2310 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2311 case 0: break; /* No 2xx or 5xx, but no probs */
2313 case -1: goto END_OFF; /* Timeout on RCPT */
2314 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2318 /* Save the first address of the next batch. */
2322 /* If there were no good recipients (but otherwise there have been no
2323 problems), just set ok TRUE, since we have handled address-specific errors
2324 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2325 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2326 well as body. Set the appropriate timeout value to be used for each chunk.
2327 (Haven't been able to make it work using select() for writing yet.) */
2329 if (!ok) ok = TRUE; else
2331 sigalrm_seen = FALSE;
2332 transport_write_timeout = ob->data_timeout;
2333 smtp_command = US"sending data block"; /* For error messages */
2334 DEBUG(D_transport|D_v)
2335 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2336 transport_count = 0;
2338 #ifndef DISABLE_DKIM
2339 ok = dkim_transport_write_message(addrlist, inblock.sock,
2340 topt_use_crlf | topt_end_dot | topt_escape_headers |
2341 (tblock->body_only? topt_no_headers : 0) |
2342 (tblock->headers_only? topt_no_body : 0) |
2343 (tblock->return_path_add? topt_add_return_path : 0) |
2344 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2345 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2346 0, /* No size limit */
2347 tblock->add_headers, tblock->remove_headers,
2348 US".", US"..", /* Escaping strings */
2349 tblock->rewrite_rules, tblock->rewrite_existflags,
2350 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2351 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2354 ok = transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2361 0, /* No size limit */
2362 tblock->add_headers, tblock->remove_headers,
2363 US".", US"..", /* Escaping strings */
2364 tblock->rewrite_rules, tblock->rewrite_existflags);
2367 /* transport_write_message() uses write() because it is called from other
2368 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2369 it can exit with "Broken pipe" as its error. This really means that the
2370 socket got closed at the far end. */
2372 transport_write_timeout = 0; /* for subsequent transports */
2374 /* Failure can either be some kind of I/O disaster (including timeout),
2375 or the failure of a transport filter or the expansion of added headers. */
2379 buffer[0] = 0; /* There hasn't been a response */
2380 goto RESPONSE_FAILED;
2383 /* We used to send the terminating "." explicitly here, but because of
2384 buffering effects at both ends of TCP/IP connections, you don't gain
2385 anything by keeping it separate, so it might as well go in the final
2386 data buffer for efficiency. This is now done by setting the topt_end_dot
2389 smtp_command = US"end of data";
2391 #ifndef DISABLE_PRDR
2392 /* For PRDR we optionally get a partial-responses warning
2393 * followed by the individual responses, before going on with
2394 * the overall response. If we don't get the warning then deal
2395 * with per non-PRDR. */
2398 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2400 if (!ok && errno == 0)
2403 case '2': prdr_active = FALSE;
2406 case '4': errno = ERRNO_DATA4XX;
2407 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2414 /* For non-PRDR SMTP, we now read a single response that applies to the
2415 whole message. If it is OK, then all the addresses have been delivered. */
2419 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2421 if (!ok && errno == 0 && buffer[0] == '4')
2423 errno = ERRNO_DATA4XX;
2424 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2428 /* For LMTP, we get back a response for every RCPT command that we sent;
2429 some may be accepted and some rejected. For those that get a response, their
2430 status is fixed; any that are accepted have been handed over, even if later
2431 responses crash - at least, that's how I read RFC 2033.
2433 If all went well, mark the recipient addresses as completed, record which
2434 host/IPaddress they were delivered to, and cut out RSET when sending another
2435 message down the same channel. Write the completed addresses to the journal
2436 now so that they are recorded in case there is a crash of hardware or
2437 software before the spool gets updated. Also record the final SMTP
2438 confirmation if needed (for SMTP only). */
2443 int delivery_time = (int)(time(NULL) - start_delivery_time);
2445 uschar *conf = NULL;
2448 /* Set up confirmation if needed - applies only to SMTP */
2451 #ifndef EXPERIMENTAL_EVENT
2452 LOGGING(smtp_confirmation) &&
2457 const uschar *s = string_printing(buffer);
2458 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2459 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2462 /* Process all transported addresses - for LMTP or PRDR, read a status for
2465 for (addr = addrlist; addr != first_addr; addr = addr->next)
2467 if (addr->transport_return != PENDING_OK) continue;
2469 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2470 remaining addresses. Otherwise, it's a return code for just the one
2471 address. For temporary errors, add a retry item for the address so that
2472 it doesn't get tried again too soon. */
2474 #ifndef DISABLE_PRDR
2475 if (lmtp || prdr_active)
2480 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2483 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2484 addr->message = string_sprintf(
2485 #ifndef DISABLE_PRDR
2486 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2488 "LMTP error after %s: %s",
2490 big_buffer, string_printing(buffer));
2491 setflag(addr, af_pass_message); /* Allow message to go to user */
2492 if (buffer[0] == '5')
2493 addr->transport_return = FAIL;
2496 errno = ERRNO_DATA4XX;
2497 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2498 addr->transport_return = DEFER;
2499 #ifndef DISABLE_PRDR
2502 retry_add_item(addr, addr->address_retry_key, 0);
2506 completed_address = TRUE; /* NOW we can set this flag */
2507 if (LOGGING(smtp_confirmation))
2509 const uschar *s = string_printing(buffer);
2510 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2511 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2515 /* SMTP, or success return from LMTP for this address. Pass back the
2516 actual host that was used. */
2518 addr->transport_return = OK;
2519 addr->more_errno = delivery_time;
2520 addr->host_used = host;
2521 addr->special_action = flag;
2522 addr->message = conf;
2523 #ifndef DISABLE_PRDR
2524 if (prdr_active) addr->flags |= af_prdr_used;
2528 #ifndef DISABLE_PRDR
2532 /* Update the journal. For homonymic addresses, use the base address plus
2533 the transport name. See lots of comments in deliver.c about the reasons
2534 for the complications when homonyms are involved. Just carry on after
2535 write error, as it may prove possible to update the spool file later. */
2537 if (testflag(addr, af_homonym))
2538 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2540 sprintf(CS buffer, "%.500s\n", addr->unique);
2542 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2543 len = Ustrlen(CS buffer);
2544 if (write(journal_fd, buffer, len) != len)
2545 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2546 "%s: %s", buffer, strerror(errno));
2550 #ifndef DISABLE_PRDR
2553 /* PRDR - get the final, overall response. For any non-success
2554 upgrade all the address statuses. */
2555 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2559 if(errno == 0 && buffer[0] == '4')
2561 errno = ERRNO_DATA4XX;
2562 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2564 for (addr = addrlist; addr != first_addr; addr = addr->next)
2565 if (buffer[0] == '5' || addr->transport_return == OK)
2566 addr->transport_return = PENDING_OK; /* allow set_errno action */
2567 goto RESPONSE_FAILED;
2570 /* Update the journal, or setup retry. */
2571 for (addr = addrlist; addr != first_addr; addr = addr->next)
2572 if (addr->transport_return == OK)
2574 if (testflag(addr, af_homonym))
2575 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2577 sprintf(CS buffer, "%.500s\n", addr->unique);
2579 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2580 len = Ustrlen(CS buffer);
2581 if (write(journal_fd, buffer, len) != len)
2582 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2583 "%s: %s", buffer, strerror(errno));
2585 else if (addr->transport_return == DEFER)
2586 retry_add_item(addr, addr->address_retry_key, -2);
2590 /* Ensure the journal file is pushed out to disk. */
2592 if (EXIMfsync(journal_fd) < 0)
2593 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2599 /* Handle general (not specific to one address) failures here. The value of ok
2600 is used to skip over this code on the falling through case. A timeout causes a
2601 deferral. Other errors may defer or fail according to the response code, and
2602 may set up a special errno value, e.g. after connection chopped, which is
2603 assumed if errno == 0 and there is no text in the buffer. If control reaches
2604 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2605 the problem is not related to this specific message. */
2610 uschar * set_message;
2616 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2617 buffer, &code, &message, &pass_message);
2625 message = US string_sprintf("send() to %s [%s] failed: %s",
2626 host->name, host->address, strerror(save_errno));
2631 /* This label is jumped to directly when a TLS negotiation has failed,
2632 or was not done for a host for which it is required. Values will be set
2633 in message and save_errno, and setting_up will always be true. Treat as
2634 a temporary error. */
2641 /* If the failure happened while setting up the call, see if the failure was
2642 a 5xx response (this will either be on connection, or following HELO - a 5xx
2643 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2644 never going to accept them. For other errors during setting up (timeouts or
2645 whatever), defer all addresses, and yield DEFER, so that the host is not
2646 tried again for a while. */
2649 ok = FALSE; /* For when reached by GOTO */
2650 set_message = message;
2657 yield = set_rc = DEFER;
2660 /* We want to handle timeouts after MAIL or "." and loss of connection after
2661 "." specially. They can indicate a problem with the sender address or with
2662 the contents of the message rather than a real error on the connection. These
2663 cases are treated in the same way as a 4xx response. This next bit of code
2664 does the classification. */
2672 #ifdef EXPERIMENTAL_INTERNATIONAL
2673 case ERRNO_UTF8_FWD:
2680 message_error = TRUE;
2684 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2685 Ustrncmp(smtp_command,"end ",4) == 0;
2688 case ERRNO_SMTPCLOSED:
2689 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2693 message_error = FALSE;
2697 /* Handle the cases that are treated as message errors. These are:
2699 (a) negative response or timeout after MAIL
2700 (b) negative response after DATA
2701 (c) negative response or timeout or dropped connection after "."
2702 (d) utf8 support required and not offered
2704 It won't be a negative response or timeout after RCPT, as that is dealt
2705 with separately above. The action in all cases is to set an appropriate
2706 error code for all the addresses, but to leave yield set to OK because the
2707 host itself has not failed. Of course, it might in practice have failed
2708 when we've had a timeout, but if so, we'll discover that at the next
2709 delivery attempt. For a temporary error, set the message_defer flag, and
2710 write to the logs for information if this is not the last host. The error
2711 for the last host will be logged as part of the address's log line. */
2715 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2717 /* If there's an errno, the message contains just the identity of
2722 else /* Anything other than 5 is treated as temporary */
2726 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2727 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2728 msglog_line(host, message);
2729 *message_defer = TRUE;
2733 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2734 ".", or some other transportation error. We defer all addresses and yield
2735 DEFER, except for the case of failed add_headers expansion, or a transport
2736 filter failure, when the yield should be ERROR, to stop it trying other
2742 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2743 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2747 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2748 #ifdef EXPERIMENTAL_DSN_INFO
2749 , smtp_greeting, helo_response
2755 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2756 SMTP session tidily. However, if there were too many addresses to send in one
2757 message (indicated by first_addr being non-NULL) we want to carry on with the
2758 rest of them. Also, it is desirable to send more than one message down the SMTP
2759 connection if there are several waiting, provided we haven't already sent so
2760 many as to hit the configured limit. The function transport_check_waiting looks
2761 for a waiting message and returns its id. Then transport_pass_socket tries to
2762 set up a continued delivery by passing the socket on to another process. The
2763 variable send_rset is FALSE if a message has just been successfully transfered.
2765 If we are already sending down a continued channel, there may be further
2766 addresses not yet delivered that are aimed at the same host, but which have not
2767 been passed in this run of the transport. In this case, continue_more will be
2768 true, and all we should do is send RSET if necessary, and return, leaving the
2771 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2772 do not want to continue with other messages down the same channel, because that
2773 can lead to looping between two or more messages, all with the same,
2774 temporarily failing address(es). [The retry information isn't updated yet, so
2775 new processes keep on trying.] We probably also don't want to try more of this
2776 message's addresses either.
2778 If we have started a TLS session, we have to end it before passing the
2779 connection to a new process. However, not all servers can handle this (Exim
2780 can), so we do not pass such a connection on if the host matches
2781 hosts_nopass_tls. */
2784 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2785 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2786 continue_more, yield, (first_addr == NULL)? "":"not ");
2788 if (completed_address && ok && send_quit)
2791 smtp_compare_t t_compare;
2793 t_compare.tblock = tblock;
2794 t_compare.current_sender_address = sender_address;
2796 if ( first_addr != NULL
2798 || ( ( tls_out.active < 0
2799 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2802 transport_check_waiting(tblock->name, host->name,
2803 tblock->connection_max_messages, new_message_id, &more,
2804 (oicf)smtp_are_same_identities, (void*)&t_compare)
2812 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2814 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2815 host->address, strerror(save_errno));
2818 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2819 ob->command_timeout)))
2822 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2826 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2827 host->name, host->address, msg);
2832 /* Either RSET was not needed, or it succeeded */
2836 if (first_addr != NULL) /* More addresses still to be sent */
2837 { /* in this run of the transport */
2838 continue_sequence++; /* Causes * in logging */
2841 if (continue_more) return yield; /* More addresses for another run */
2843 /* Pass the socket to a new Exim process. Before doing so, we must shut
2844 down TLS. Not all MTAs allow for the continuation of the SMTP session
2845 when TLS is shut down. We test for this by sending a new EHLO. If we
2846 don't get a good response, we don't attempt to pass the socket on. */
2849 if (tls_out.active >= 0)
2851 tls_close(FALSE, TRUE);
2855 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2856 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2857 ob->command_timeout);
2861 /* If the socket is successfully passed, we musn't send QUIT (or
2862 indeed anything!) from here. */
2864 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2865 propagate it from the initial
2867 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2868 new_message_id, inblock.sock))
2874 /* If RSET failed and there are addresses left, they get deferred. */
2876 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2877 #ifdef EXPERIMENTAL_DSN_INFO
2878 , smtp_greeting, helo_response
2884 /* End off tidily with QUIT unless the connection has died or the socket has
2885 been passed to another process. There has been discussion on the net about what
2886 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2887 to wait for a response, but on the other hand, there isn't anything one can do
2888 with an error response, other than log it. Exim used to do that. However,
2889 further discussion suggested that it is positively advantageous not to wait for
2890 the response, but to close the session immediately. This is supposed to move
2891 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2892 load from the server. (Hosts that are both servers and clients may not see much
2893 difference, of course.) Further discussion indicated that this was safe to do
2894 on Unix systems which have decent implementations of TCP/IP that leave the
2895 connection around for a while (TIME_WAIT) after the application has gone away.
2896 This enables the response sent by the server to be properly ACKed rather than
2897 timed out, as can happen on broken TCP/IP implementations on other OS.
2899 This change is being made on 31-Jul-98. After over a year of trouble-free
2900 operation, the old commented-out code was removed on 17-Sep-99. */
2903 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2908 tls_close(FALSE, TRUE);
2911 /* Close the socket, and return the appropriate value, first setting
2912 works because the NULL setting is passed back to the calling process, and
2913 remote_max_parallel is forced to 1 when delivering over an existing connection,
2915 If all went well and continue_more is set, we shouldn't actually get here if
2916 there are further addresses, as the return above will be taken. However,
2917 writing RSET might have failed, or there may be other addresses whose hosts are
2918 specified in the transports, and therefore not visible at top level, in which
2919 case continue_more won't get set. */
2921 (void)close(inblock.sock);
2923 #ifdef EXPERIMENTAL_EVENT
2924 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2927 continue_transport = NULL;
2928 continue_hostname = NULL;
2935 /*************************************************
2936 * Closedown entry point *
2937 *************************************************/
2939 /* This function is called when exim is passed an open smtp channel
2940 from another incarnation, but the message which it has been asked
2941 to deliver no longer exists. The channel is on stdin.
2943 We might do fancy things like looking for another message to send down
2944 the channel, but if the one we sought has gone, it has probably been
2945 delivered by some other process that itself will seek further messages,
2946 so just close down our connection.
2948 Argument: pointer to the transport instance block
2953 smtp_transport_closedown(transport_instance *tblock)
2955 smtp_transport_options_block *ob =
2956 (smtp_transport_options_block *)(tblock->options_block);
2957 smtp_inblock inblock;
2958 smtp_outblock outblock;
2960 uschar inbuffer[4096];
2961 uschar outbuffer[16];
2963 inblock.sock = fileno(stdin);
2964 inblock.buffer = inbuffer;
2965 inblock.buffersize = sizeof(inbuffer);
2966 inblock.ptr = inbuffer;
2967 inblock.ptrend = inbuffer;
2969 outblock.sock = inblock.sock;
2970 outblock.buffersize = sizeof(outbuffer);
2971 outblock.buffer = outbuffer;
2972 outblock.ptr = outbuffer;
2973 outblock.cmd_count = 0;
2974 outblock.authenticating = FALSE;
2976 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2977 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2978 ob->command_timeout);
2979 (void)close(inblock.sock);
2984 /*************************************************
2985 * Prepare addresses for delivery *
2986 *************************************************/
2988 /* This function is called to flush out error settings from previous delivery
2989 attempts to other hosts. It also records whether we got here via an MX record
2990 or not in the more_errno field of the address. We are interested only in
2991 addresses that are still marked DEFER - others may have got delivered to a
2992 previously considered IP address. Set their status to PENDING_DEFER to indicate
2993 which ones are relevant this time.
2996 addrlist the list of addresses
2997 host the host we are delivering to
2999 Returns: the first address for this delivery
3002 static address_item *
3003 prepare_addresses(address_item *addrlist, host_item *host)
3005 address_item *first_addr = NULL;
3007 for (addr = addrlist; addr != NULL; addr = addr->next)
3008 if (addr->transport_return == DEFER)
3010 if (first_addr == NULL) first_addr = addr;
3011 addr->transport_return = PENDING_DEFER;
3012 addr->basic_errno = 0;
3013 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3014 addr->message = NULL;
3016 addr->cipher = NULL;
3017 addr->ourcert = NULL;
3018 addr->peercert = NULL;
3019 addr->peerdn = NULL;
3020 addr->ocsp = OCSP_NOT_REQ;
3022 #ifdef EXPERIMENTAL_DSN_INFO
3023 addr->smtp_greeting = NULL;
3024 addr->helo_response = NULL;
3032 /*************************************************
3033 * Main entry point *
3034 *************************************************/
3036 /* See local README for interface details. As this is a remote transport, it is
3037 given a chain of addresses to be delivered in one connection, if possible. It
3038 always returns TRUE, indicating that each address has its own independent
3039 status set, except if there is a setting up problem, in which case it returns
3043 smtp_transport_entry(
3044 transport_instance *tblock, /* data for this instantiation */
3045 address_item *addrlist) /* addresses we are working on */
3049 int hosts_defer = 0;
3051 int hosts_looked_up = 0;
3052 int hosts_retry = 0;
3053 int hosts_serial = 0;
3054 int hosts_total = 0;
3055 int total_hosts_tried = 0;
3057 BOOL expired = TRUE;
3058 BOOL continuing = continue_hostname != NULL;
3059 uschar *expanded_hosts = NULL;
3061 uschar *tid = string_sprintf("%s transport", tblock->name);
3062 smtp_transport_options_block *ob =
3063 (smtp_transport_options_block *)(tblock->options_block);
3064 host_item *hostlist = addrlist->host_list;
3065 host_item *host = NULL;
3069 debug_printf("%s transport entered\n", tblock->name);
3070 for (addr = addrlist; addr != NULL; addr = addr->next)
3071 debug_printf(" %s\n", addr->address);
3072 if (continuing) debug_printf("already connected to %s [%s]\n",
3073 continue_hostname, continue_host_address);
3076 /* Set the flag requesting that these hosts be added to the waiting
3077 database if the delivery fails temporarily or if we are running with
3078 queue_smtp or a 2-stage queue run. This gets unset for certain
3079 kinds of error, typically those that are specific to the message. */
3081 update_waiting = TRUE;
3083 /* If a host list is not defined for the addresses - they must all have the
3084 same one in order to be passed to a single transport - or if the transport has
3085 a host list with hosts_override set, use the host list supplied with the
3086 transport. It is an error for this not to exist. */
3088 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3090 if (ob->hosts == NULL)
3092 addrlist->message = string_sprintf("%s transport called with no hosts set",
3094 addrlist->transport_return = PANIC;
3095 return FALSE; /* Only top address has status */
3098 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3101 /* If the transport's host list contains no '$' characters, and we are not
3102 randomizing, it is fixed and therefore a chain of hosts can be built once
3103 and for all, and remembered for subsequent use by other calls to this
3104 transport. If, on the other hand, the host list does contain '$', or we are
3105 randomizing its order, we have to rebuild it each time. In the fixed case,
3106 as the hosts string will never be used again, it doesn't matter that we
3107 replace all the : characters with zeros. */
3109 if (ob->hostlist == NULL)
3111 uschar *s = ob->hosts;
3113 if (Ustrchr(s, '$') != NULL)
3115 if (!(expanded_hosts = expand_string(s)))
3117 addrlist->message = string_sprintf("failed to expand list of hosts "
3118 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3119 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3120 return FALSE; /* Only top address has status */
3122 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3123 "\"%s\"\n", s, expanded_hosts);
3127 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3129 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3131 /* Check that the expansion yielded something useful. */
3132 if (hostlist == NULL)
3135 string_sprintf("%s transport has empty hosts setting", tblock->name);
3136 addrlist->transport_return = PANIC;
3137 return FALSE; /* Only top address has status */
3140 /* If there was no expansion of hosts, save the host list for
3143 if (!expanded_hosts) ob->hostlist = hostlist;
3146 /* This is not the first time this transport has been run in this delivery;
3147 the host list was built previously. */
3150 hostlist = ob->hostlist;
3153 /* The host list was supplied with the address. If hosts_randomize is set, we
3154 must sort it into a random order if it did not come from MX records and has not
3155 already been randomized (but don't bother if continuing down an existing
3158 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3160 host_item *newlist = NULL;
3161 while (hostlist != NULL)
3163 host_item *h = hostlist;
3164 hostlist = hostlist->next;
3166 h->sort_key = random_number(100);
3168 if (newlist == NULL)
3173 else if (h->sort_key < newlist->sort_key)
3180 host_item *hh = newlist;
3181 while (hh->next != NULL)
3183 if (h->sort_key < hh->next->sort_key) break;
3191 hostlist = addrlist->host_list = newlist;
3194 /* Sort out the default port. */
3196 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3198 /* For each host-plus-IP-address on the list:
3200 . If this is a continued delivery and the host isn't the one with the
3201 current connection, skip.
3203 . If the status is unusable (i.e. previously failed or retry checked), skip.
3205 . If no IP address set, get the address, either by turning the name into
3206 an address, calling gethostbyname if gethostbyname is on, or by calling
3207 the DNS. The DNS may yield multiple addresses, in which case insert the
3208 extra ones into the list.
3210 . Get the retry data if not previously obtained for this address and set the
3211 field which remembers the state of this address. Skip if the retry time is
3212 not reached. If not, remember whether retry data was found. The retry string
3213 contains both the name and the IP address.
3215 . Scan the list of addresses and mark those whose status is DEFER as
3216 PENDING_DEFER. These are the only ones that will be processed in this cycle
3219 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3220 Some addresses may be successfully delivered, others may fail, and yet
3221 others may get temporary errors and so get marked DEFER.
3223 . The return from the delivery attempt is OK if a connection was made and a
3224 valid SMTP dialogue was completed. Otherwise it is DEFER.
3226 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3228 . If fail to connect, or other defer state, add a retry item.
3230 . If there are any addresses whose status is still DEFER, carry on to the
3231 next host/IPaddress, unless we have tried the number of hosts given
3232 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3233 there is some fancy logic for hosts_max_try that means its limit can be
3234 overstepped in some circumstances.
3236 If we get to the end of the list, all hosts have deferred at least one address,
3237 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3238 delivery attempt to those hosts whose last try was before the arrival time of
3239 the current message. To cope with this, we have to go round the loop a second
3240 time. After that, set the status and error data for any addresses that haven't
3241 had it set already. */
3243 for (cutoff_retry = 0; expired &&
3244 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3247 host_item *nexthost = NULL;
3248 int unexpired_hosts_tried = 0;
3250 for (host = hostlist;
3252 unexpired_hosts_tried < ob->hosts_max_try &&
3253 total_hosts_tried < ob->hosts_max_try_hardlimit;
3259 BOOL serialized = FALSE;
3260 BOOL host_is_expired = FALSE;
3261 BOOL message_defer = FALSE;
3262 BOOL ifchanges = FALSE;
3263 BOOL some_deferred = FALSE;
3264 address_item *first_addr = NULL;
3265 uschar *interface = NULL;
3266 uschar *retry_host_key = NULL;
3267 uschar *retry_message_key = NULL;
3268 uschar *serialize_key = NULL;
3270 /* Default next host is next host. :-) But this can vary if the
3271 hosts_max_try limit is hit (see below). It may also be reset if a host
3272 address is looked up here (in case the host was multihomed). */
3274 nexthost = host->next;
3276 /* If the address hasn't yet been obtained from the host name, look it up
3277 now, unless the host is already marked as unusable. If it is marked as
3278 unusable, it means that the router was unable to find its IP address (in
3279 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3280 the lookup failed last time. We don't get this far if *all* MX records
3281 point to non-existent hosts; that is treated as a hard error.
3283 We can just skip this host entirely. When the hosts came from the router,
3284 the address will timeout based on the other host(s); when the address is
3285 looked up below, there is an explicit retry record added.
3287 Note that we mustn't skip unusable hosts if the address is not unset; they
3288 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3290 if (host->address == NULL)
3292 int new_port, flags;
3295 if (host->status >= hstatus_unusable)
3297 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3302 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3304 /* The host name is permitted to have an attached port. Find it, and
3305 strip it from the name. Just remember it for now. */
3307 new_port = host_item_get_port(host);
3309 /* Count hosts looked up */
3313 /* Find by name if so configured, or if it's an IP address. We don't
3314 just copy the IP address, because we need the test-for-local to happen. */
3316 flags = HOST_FIND_BY_A;
3317 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3318 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3320 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3321 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3323 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3324 &ob->dnssec, /* domains for request/require */
3327 /* Update the host (and any additional blocks, resulting from
3328 multihoming) with a host-specific port, if any. */
3330 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3332 /* Failure to find the host at this time (usually DNS temporary failure)
3333 is really a kind of routing failure rather than a transport failure.
3334 Therefore we add a retry item of the routing kind, not to stop us trying
3335 to look this name up here again, but to ensure the address gets timed
3336 out if the failures go on long enough. A complete failure at this point
3337 commonly points to a configuration error, but the best action is still
3338 to carry on for the next host. */
3340 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3342 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3344 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3345 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3346 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3347 host->status = hstatus_unusable;
3349 for (addr = addrlist; addr != NULL; addr = addr->next)
3351 if (addr->transport_return != DEFER) continue;
3352 addr->basic_errno = ERRNO_UNKNOWNHOST;
3354 string_sprintf("failed to lookup IP address for %s", host->name);
3359 /* If the host is actually the local host, we may have a problem, or
3360 there may be some cunning configuration going on. In the problem case,
3361 log things and give up. The default transport status is already DEFER. */
3363 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3365 for (addr = addrlist; addr != NULL; addr = addr->next)
3367 addr->basic_errno = 0;
3368 addr->message = string_sprintf("%s transport found host %s to be "
3369 "local", tblock->name, host->name);
3373 } /* End of block for IP address lookup */
3375 /* If this is a continued delivery, we are interested only in the host
3376 which matches the name of the existing open channel. The check is put
3377 here after the local host lookup, in case the name gets expanded as a
3378 result of the lookup. Set expired FALSE, to save the outer loop executing
3381 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3382 Ustrcmp(continue_host_address, host->address) != 0))
3385 continue; /* With next host */
3388 /* Reset the default next host in case a multihomed host whose addresses
3389 are not looked up till just above added to the host list. */
3391 nexthost = host->next;
3393 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3394 domain is in queue_smtp_domains, we don't actually want to attempt any
3395 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3396 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3397 were not in it. We don't want to hold up all SMTP deliveries! Except when
3398 doing a two-stage queue run, don't do this if forcing. */
3400 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3401 match_isinlist(addrlist->domain,
3402 (const uschar **)&queue_smtp_domains, 0,
3403 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3406 for (addr = addrlist; addr != NULL; addr = addr->next)
3408 if (addr->transport_return != DEFER) continue;
3409 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3411 continue; /* With next host */
3414 /* Count hosts being considered - purely for an intelligent comment
3415 if none are usable. */
3419 /* Set $host and $host address now in case they are needed for the
3420 interface expansion or the serialize_hosts check; they remain set if an
3421 actual delivery happens. */
3423 deliver_host = host->name;
3424 deliver_host_address = host->address;
3425 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3426 : host->dnssec == DS_NO ? US"no"
3429 /* Set up a string for adding to the retry key if the port number is not
3430 the standard SMTP port. A host may have its own port setting that overrides
3433 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3435 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3437 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3438 string changes upon expansion, we must add it to the key that is used for
3439 retries, because connections to the same host from a different interface
3440 should be treated separately. */
3442 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3443 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3446 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3448 /* The first time round the outer loop, check the status of the host by
3449 inspecting the retry data. The second time round, we are interested only
3450 in expired hosts that haven't been tried since this message arrived. */
3452 if (cutoff_retry == 0)
3455 /* Ensure the status of the address is set by checking retry data if
3456 necessary. There may be host-specific retry data (applicable to all
3457 messages) and also data for retries of a specific message at this host.
3458 If either of these retry records are actually read, the keys used are
3459 returned to save recomputing them later. */
3461 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3462 US"retry_include_ip_address", ob->retry_include_ip_address,
3463 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3464 continue; /* with next host */
3466 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3467 incl_ip, &retry_host_key, &retry_message_key);
3469 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3470 (host->address == NULL)? US"" : host->address, pistring,
3471 (host->status == hstatus_usable)? "usable" :
3472 (host->status == hstatus_unusable)? "unusable" :
3473 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3475 /* Skip this address if not usable at this time, noting if it wasn't
3476 actually expired, both locally and in the address. */
3478 switch (host->status)
3480 case hstatus_unusable:
3482 setflag(addrlist, af_retry_skipped);
3485 case hstatus_unusable_expired:
3488 case hwhy_retry: hosts_retry++; break;
3489 case hwhy_failed: hosts_fail++; break;
3490 case hwhy_deferred: hosts_defer++; break;
3493 /* If there was a retry message key, implying that previously there
3494 was a message-specific defer, we don't want to update the list of
3495 messages waiting for these hosts. */
3497 if (retry_message_key != NULL) update_waiting = FALSE;
3498 continue; /* With the next host or IP address */
3502 /* Second time round the loop: if the address is set but expired, and
3503 the message is newer than the last try, let it through. */
3507 if (host->address == NULL ||
3508 host->status != hstatus_unusable_expired ||
3509 host->last_try > received_time)
3512 debug_printf("trying expired host %s [%s]%s\n",
3513 host->name, host->address, pistring);
3514 host_is_expired = TRUE;
3517 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3518 it remains TRUE only if all hosts are expired and none are actually tried.
3523 /* If this host is listed as one to which access must be serialized,
3524 see if another Exim process has a connection to it, and if so, skip
3525 this host. If not, update the database to record our connection to it
3526 and remember this for later deletion. Do not do any of this if we are
3527 sending the message down a pre-existing connection. */
3530 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3532 serialize_key = string_sprintf("host-serialize-%s", host->name);
3533 if (!enq_start(serialize_key))
3536 debug_printf("skipping host %s because another Exim process "
3537 "is connected to it\n", host->name);
3544 /* OK, we have an IP address that is not waiting for its retry time to
3545 arrive (it might be expired) OR (second time round the loop) we have an
3546 expired host that hasn't been tried since the message arrived. Have a go
3547 at delivering the message to it. First prepare the addresses by flushing
3548 out the result of previous attempts, and finding the first address that
3549 is still to be delivered. */
3551 first_addr = prepare_addresses(addrlist, host);
3553 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3554 message_id, host->name, host->address, addrlist->address,
3555 (addrlist->next == NULL)? "" : ", ...");
3557 set_process_info("delivering %s to %s [%s] (%s%s)",
3558 message_id, host->name, host->address, addrlist->address,
3559 (addrlist->next == NULL)? "" : ", ...");
3561 /* This is not for real; don't do the delivery. If there are
3562 any remaining hosts, list them. */
3567 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3568 for (addr = addrlist; addr != NULL; addr = addr->next)
3570 addr->host_used = host;
3571 addr->special_action = '*';
3572 addr->message = US"delivery bypassed by -N option";
3576 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3577 "*** host and remaining hosts:\n", tblock->name);
3578 for (host2 = host; host2 != NULL; host2 = host2->next)
3579 debug_printf(" %s [%s]\n", host2->name,
3580 (host2->address == NULL)? US"unset" : host2->address);
3585 /* This is for real. If the host is expired, we don't count it for
3586 hosts_max_retry. This ensures that all hosts must expire before an address
3587 is timed out, unless hosts_max_try_hardlimit (which protects against
3588 lunatic DNS configurations) is reached.
3590 If the host is not expired and we are about to hit the hosts_max_retry
3591 limit, check to see if there is a subsequent hosts with a different MX
3592 value. If so, make that the next host, and don't count this one. This is a
3593 heuristic to make sure that different MXs do get tried. With a normal kind
3594 of retry rule, they would get tried anyway when the earlier hosts were
3595 delayed, but if the domain has a "retry every time" type of rule - as is
3596 often used for the the very large ISPs, that won't happen. */
3601 /* Make a copy of the host if it is local to this invocation
3602 of the transport. */
3606 thost = store_get(sizeof(host_item));
3608 thost->name = string_copy(host->name);
3609 thost->address = string_copy(host->address);
3614 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3618 debug_printf("hosts_max_try limit reached with this host\n");
3619 for (h = host; h != NULL; h = h->next)
3620 if (h->mx != host->mx) break;
3624 unexpired_hosts_tried--;
3625 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3626 "and will be tried\n");
3630 /* Attempt the delivery. */
3632 total_hosts_tried++;
3633 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3634 &message_defer, FALSE);
3637 OK => connection made, each address contains its result;
3638 message_defer is set for message-specific defers (when all
3639 recipients are marked defer)
3640 DEFER => there was a non-message-specific delivery problem;
3641 ERROR => there was a problem setting up the arguments for a filter,
3642 or there was a problem with expanding added headers
3645 /* If the result is not OK, there was a non-message-specific problem.
3646 If the result is DEFER, we need to write to the logs saying what happened
3647 for this particular host, except in the case of authentication and TLS
3648 failures, where the log has already been written. If all hosts defer a
3649 general message is written at the end. */
3651 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3652 first_addr->basic_errno != ERRNO_TLSFAILURE)
3653 write_logs(first_addr, host);
3655 #ifdef EXPERIMENTAL_EVENT
3657 deferred_event_raise(first_addr, host);
3660 /* If STARTTLS was accepted, but there was a failure in setting up the
3661 TLS session (usually a certificate screwup), and the host is not in
3662 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3663 TLS forcibly turned off. We have to start from scratch with a new SMTP
3664 connection. That's why the retry is done from here, not from within
3665 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3666 session, so the in-clear transmission after those errors, if permitted,
3667 happens inside smtp_deliver().] */
3671 && first_addr->basic_errno == ERRNO_TLSFAILURE
3672 && ob->tls_tempfail_tryclear
3673 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3676 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3677 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3678 first_addr = prepare_addresses(addrlist, host);
3679 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3680 &message_defer, TRUE);
3681 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3682 write_logs(first_addr, host);
3683 # ifdef EXPERIMENTAL_EVENT
3685 deferred_event_raise(first_addr, host);
3688 #endif /*SUPPORT_TLS*/
3691 /* Delivery attempt finished */
3693 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3696 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3697 message_id, host->name, host->address, addrlist->address,
3698 (addrlist->next == NULL)? "" : " (& others)", rs);
3700 /* Release serialization if set up */
3702 if (serialized) enq_end(serialize_key);
3704 /* If the result is DEFER, or if a host retry record is known to exist, we
3705 need to add an item to the retry chain for updating the retry database
3706 at the end of delivery. We only need to add the item to the top address,
3707 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3708 for any other delivery attempts using the same address. (It is copied into
3709 the unusable tree at the outer level, so even if different address blocks
3710 contain the same address, it still won't get tried again.) */
3712 if (rc == DEFER || retry_host_key != NULL)
3714 int delete_flag = (rc != DEFER)? rf_delete : 0;
3715 if (retry_host_key == NULL)
3718 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3719 US"retry_include_ip_address", ob->retry_include_ip_address,
3720 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3721 incl_ip = TRUE; /* error; use most-specific retry record */
3723 retry_host_key = incl_ip ?
3724 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3725 string_sprintf("T:%S%s", host->name, pistring);
3728 /* If a delivery of another message over an existing SMTP connection
3729 yields DEFER, we do NOT set up retry data for the host. This covers the
3730 case when there are delays in routing the addresses in the second message
3731 that are so long that the server times out. This is alleviated by not
3732 routing addresses that previously had routing defers when handling an
3733 existing connection, but even so, this case may occur (e.g. if a
3734 previously happily routed address starts giving routing defers). If the
3735 host is genuinely down, another non-continued message delivery will
3736 notice it soon enough. */
3738 if (delete_flag != 0 || !continuing)
3739 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3741 /* We may have tried an expired host, if its retry time has come; ensure
3742 the status reflects the expiry for the benefit of any other addresses. */
3746 host->status = (host_is_expired)?
3747 hstatus_unusable_expired : hstatus_unusable;
3748 host->why = hwhy_deferred;
3752 /* If message_defer is set (host was OK, but every recipient got deferred
3753 because of some message-specific problem), or if that had happened
3754 previously so that a message retry key exists, add an appropriate item
3755 to the retry chain. Note that if there was a message defer but now there is
3756 a host defer, the message defer record gets deleted. That seems perfectly
3757 reasonable. Also, stop the message from being remembered as waiting
3758 for specific hosts. */
3760 if (message_defer || retry_message_key != NULL)
3762 int delete_flag = message_defer? 0 : rf_delete;
3763 if (retry_message_key == NULL)
3766 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3767 US"retry_include_ip_address", ob->retry_include_ip_address,
3768 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3769 incl_ip = TRUE; /* error; use most-specific retry record */
3771 retry_message_key = incl_ip ?
3772 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3774 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3776 retry_add_item(addrlist, retry_message_key,
3777 rf_message | rf_host | delete_flag);
3778 update_waiting = FALSE;
3781 /* Any return other than DEFER (that is, OK or ERROR) means that the
3782 addresses have got their final statuses filled in for this host. In the OK
3783 case, see if any of them are deferred. */
3786 for (addr = addrlist; addr; addr = addr->next)
3787 if (addr->transport_return == DEFER)
3789 some_deferred = TRUE;
3793 /* If no addresses deferred or the result was ERROR, return. We do this for
3794 ERROR because a failing filter set-up or add_headers expansion is likely to
3795 fail for any host we try. */
3797 if (rc == ERROR || (rc == OK && !some_deferred))
3799 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3800 return TRUE; /* Each address has its status */
3803 /* If the result was DEFER or some individual addresses deferred, let
3804 the loop run to try other hosts with the deferred addresses, except for the
3805 case when we were trying to deliver down an existing channel and failed.
3806 Don't try any other hosts in this case. */
3808 if (continuing) break;
3810 /* If the whole delivery, or some individual addresses, were deferred and
3811 there are more hosts that could be tried, do not count this host towards
3812 the hosts_max_try limit if the age of the message is greater than the
3813 maximum retry time for this host. This means we may try try all hosts,
3814 ignoring the limit, when messages have been around for some time. This is
3815 important because if we don't try all hosts, the address will never time
3816 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3818 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3821 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3823 if (retry != NULL && retry->rules != NULL)
3825 retry_rule *last_rule;
3826 for (last_rule = retry->rules;
3827 last_rule->next != NULL;
3828 last_rule = last_rule->next);
3829 timedout = time(NULL) - received_time > last_rule->timeout;
3831 else timedout = TRUE; /* No rule => timed out */
3835 unexpired_hosts_tried--;
3836 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3837 "hosts_max_try (message older than host's retry time)\n");
3840 } /* End of loop for trying multiple hosts. */
3842 /* This is the end of the loop that repeats iff expired is TRUE and
3843 ob->delay_after_cutoff is FALSE. The second time round we will
3844 try those hosts that haven't been tried since the message arrived. */
3848 debug_printf("all IP addresses skipped or deferred at least one address\n");
3849 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3850 debug_printf("retrying IP addresses not tried since message arrived\n");
3855 /* Get here if all IP addresses are skipped or defer at least one address. In
3856 MUA wrapper mode, this will happen only for connection or other non-message-
3857 specific failures. Force the delivery status for all addresses to FAIL. */
3861 for (addr = addrlist; addr != NULL; addr = addr->next)
3862 addr->transport_return = FAIL;
3866 /* In the normal, non-wrapper case, add a standard message to each deferred
3867 address if there hasn't been an error, that is, if it hasn't actually been
3868 tried this time. The variable "expired" will be FALSE if any deliveries were
3869 actually tried, or if there was at least one host that was not expired. That
3870 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3871 a delivery has been tried, an error code will be set, and the failing of the
3872 message is handled by the retry code later.
3874 If queue_smtp is set, or this transport was called to send a subsequent message
3875 down an existing TCP/IP connection, and something caused the host not to be
3876 found, we end up here, but can detect these cases and handle them specially. */
3878 for (addr = addrlist; addr != NULL; addr = addr->next)
3880 /* If host is not NULL, it means that we stopped processing the host list
3881 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3882 means we need to behave as if some hosts were skipped because their retry
3883 time had not come. Specifically, this prevents the address from timing out.
3884 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3885 hosts were tried. */
3889 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3892 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3893 "hosts were tried\n");
3898 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3899 setflag(addr, af_retry_skipped);
3903 if (queue_smtp) /* no deliveries attempted */
3905 addr->transport_return = DEFER;
3906 addr->basic_errno = 0;
3907 addr->message = US"SMTP delivery explicitly queued";
3910 else if (addr->transport_return == DEFER &&
3911 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3912 addr->message == NULL)
3914 addr->basic_errno = ERRNO_HRETRY;
3915 if (continue_hostname != NULL)
3917 addr->message = US"no host found for existing SMTP connection";
3921 setflag(addr, af_pass_message); /* This is not a security risk */
3922 addr->message = (ob->delay_after_cutoff)?
3923 US"retry time not reached for any host after a long failure period" :
3924 US"all hosts have been failing for a long time and were last tried "
3925 "after this message arrived";
3927 /* If we are already using fallback hosts, or there are no fallback hosts
3928 defined, convert the result to FAIL to cause a bounce. */
3930 if (addr->host_list == addr->fallback_hosts ||
3931 addr->fallback_hosts == NULL)
3932 addr->transport_return = FAIL;
3936 if (hosts_retry == hosts_total)
3937 addr->message = US"retry time not reached for any host";
3938 else if (hosts_fail == hosts_total)
3939 addr->message = US"all host address lookups failed permanently";
3940 else if (hosts_defer == hosts_total)
3941 addr->message = US"all host address lookups failed temporarily";
3942 else if (hosts_serial == hosts_total)
3943 addr->message = US"connection limit reached for all hosts";
3944 else if (hosts_fail+hosts_defer == hosts_total)
3945 addr->message = US"all host address lookups failed";
3946 else addr->message = US"some host address lookups failed and retry time "
3947 "not reached for other hosts or connection limit reached";
3952 /* Update the database which keeps information about which messages are waiting
3953 for which hosts to become available. For some message-specific errors, the
3954 update_waiting flag is turned off because we don't want follow-on deliveries in
3955 those cases. If this transport instance is explicitly limited to one message
3956 per connection then follow-on deliveries are not possible and there's no need
3957 to create/update the per-transport wait-<transport_name> database. */
3959 if (update_waiting && tblock->connection_max_messages != 1)
3960 transport_update_waiting(hostlist, tblock->name);
3964 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3966 return TRUE; /* Each address has its status */
3971 /* End of transport/smtp.c */