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) }
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
253 ,NULL /* socks_proxy */
256 ,NULL, /* tls_certificate */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
282 /* some DSN flags for use later */
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
317 Returns: OK always (FAIL, DEFER not used)
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
327 errmsg = errmsg; /* Keep picky compilers happy */
331 /* Pass back options if required. This interface is getting very messy. */
335 tf->interface = ob->interface;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
351 if (!testflag(addrlist, af_local_host_removed))
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
371 Argument: pointer to the transport instance block
376 smtp_transport_init(transport_instance *tblock)
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
381 /* Retry_use_local_part defaults FALSE if unset */
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
386 /* Set the default port according to the protocol */
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392 /* Set up the setup entry point, to be called before subprocesses for this
395 tblock->setup = smtp_transport_setup;
397 /* Complain if any of the timeouts are zero. */
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
476 if (pass_message) setflag(addr, af_pass_message);
478 addr->transport_return = rc;
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
541 *yield = '4'; /* Default setting is to give a temporary error */
543 /* Handle response timeout */
545 if (*errno_value == ETIMEDOUT)
547 *message = US string_sprintf("SMTP timeout after %s%s",
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
555 /* Handle malformed SMTP response */
557 if (*errno_value == ERRNO_SMTPFORMAT)
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
572 if (*errno_value == ERRNO_FILTER_FAIL)
574 *message = US string_sprintf("transport filter process failed (%d)%s",
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
591 /* Handle failure to write a complete data block */
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
595 *message = US string_sprintf("failed to write a data block");
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
609 /* Handle error responses from the remote mailer. */
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
644 /* This writes to the main log and to the message log.
647 addr the address item containing error information
648 host the current host
654 write_logs(address_item *addr, host_item *host)
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
658 if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
663 message = string_sprintf("%s: %s", message, addr->message);
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
671 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 #ifndef DISABLE_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
695 addr the address item containing error information
696 host the current host
702 deferred_event_raise(address_item *addr, host_item *host)
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
724 (void) event_raise(action, US"msg:host:defer",
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
797 address_item *addr = *sync_addr;
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
812 uschar flushbuffer[4096];
814 if (buffer[0] == '4')
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
823 && (errno != 0 || flushbuffer[0] == 0))
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
850 /* The address was accepted */
851 addr->host_used = host;
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
856 addr->transport_return = PENDING_OK;
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
862 if (testflag(addr, af_dr_retry_exists))
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
871 /* Timeout while reading the response */
873 else if (errno == ETIMEDOUT)
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
888 else if (errno != 0 || buffer[0] == 0)
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
895 /* Handle SMTP permanent and temporary response codes. */
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
906 /* The response was 5xx */
908 if (buffer[0] == '5')
910 addr->transport_return = FAIL;
914 /* The response was 4xx */
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
922 #ifndef DISABLE_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
933 #ifndef DISABLE_EVENT
935 msg_event_raise(US"msg:rcpt:defer", addr);
938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
941 update_waiting = FALSE;
943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
947 if (address_retry_include_sender)
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
951 retry_add_item(addr, altkey, 0);
953 else retry_add_item(addr, addr->address_retry_key, 0);
956 } /* Loop for next RCPT response */
958 /* Update where to start at for the next block of responses, unless we
959 have already handled all the addresses. */
961 if (addr != NULL) *sync_addr = addr->next;
963 /* Handle a response to DATA. If we have not had any good recipients, either
964 previously or in this block, the response is ignored. */
966 if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
972 if (pending_DATA > 0 || (yield & 1) != 0)
974 if (errno == 0 && buffer[0] == '4')
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
986 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987 present) received 3xx. If any RCPTs were handled and yielded anything other
988 than 4xx, yield will be set non-zero. */
995 /* Do the client side of smtp-level authentication */
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1009 FAIL_SEND Failed communications - transmit
1014 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1019 uschar *fail_reason = US"server did not advertise AUTH support";
1021 smtp_authenticated = FALSE;
1022 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1023 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1025 if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1029 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
1037 if (require_auth == OK ||
1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1041 fail_reason = US"no common mechanisms were found";
1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1066 /* Loop to scan supported server mechanisms */
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1077 while (*p != 0 && !isspace(*p)) p++;
1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1107 /* Failure after writing a command */
1112 /* Failure after reading a response */
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1133 /* Internal problem, message in buffer. */
1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
1147 /* If we haven't authenticated, but are required to, give up. */
1149 if (require_auth == OK && !smtp_authenticated)
1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
1161 /* Construct AUTH appendix string for MAIL TO */
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1168 Globals smtp_authenticated
1169 client_authenticated_sender
1170 Return True on error, otherwise buffer has (possibly empty) terminated string
1174 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1177 uschar *local_authenticated_sender = authenticated_sender;
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1183 if (ob->authenticated_sender != NULL)
1185 uschar *new = expand_string(ob->authenticated_sender);
1188 if (!expand_string_forcedfail)
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1196 else if (new[0] != 0) local_authenticated_sender = new;
1199 /* Add the authenticated sender address if present */
1201 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1217 #ifdef EXPERIMENTAL_DANE
1219 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1220 BOOL dane_required, BOOL * dane)
1222 /* move this out to host.c given the similarity to dns_lookup() ? */
1224 const uschar * fullname = buffer;
1226 /* TLSA lookup string */
1227 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1229 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1232 return DEFER; /* just defer this TLS'd conn */
1241 if (!dns_is_secure(dnsa))
1243 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1255 typedef struct smtp_compare_s
1257 uschar *current_sender_address;
1258 struct transport_instance *tblock;
1262 Create a unique string that identifies this message, it is based on
1263 sender_address, helo_data and tls_certificate if enabled. */
1266 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1268 address_item * addr1;
1269 uschar * if1 = US"";
1270 uschar * helo1 = US"";
1272 uschar * tlsc1 = US"";
1274 uschar * save_sender_address = sender_address;
1275 uschar * local_identity = NULL;
1276 smtp_transport_options_block * ob =
1277 (smtp_transport_options_block *)tblock->options_block;
1279 sender_address = sender;
1281 addr1 = deliver_make_addr (sender, TRUE);
1282 deliver_set_expansions(addr1);
1285 if1 = expand_string(ob->interface);
1288 helo1 = expand_string(ob->helo_data);
1291 if (ob->tls_certificate)
1292 tlsc1 = expand_string(ob->tls_certificate);
1293 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1295 local_identity = string_sprintf ("%s^%s", if1, helo1);
1298 deliver_set_expansions(NULL);
1299 sender_address = save_sender_address;
1301 return local_identity;
1306 /* This routine is a callback that is called from transport_check_waiting.
1307 This function will evaluate the incoming message versus the previous
1308 message. If the incoming message is using a different local identity then
1309 we will veto this new message. */
1312 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1315 uschar * message_local_identity,
1316 * current_local_identity,
1317 * new_sender_address;
1319 current_local_identity =
1320 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1322 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1325 message_local_identity =
1326 smtp_local_identity(new_sender_address, s_compare->tblock);
1328 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1333 /*************************************************
1334 * Deliver address list to given host *
1335 *************************************************/
1337 /* If continue_hostname is not null, we get here only when continuing to
1338 deliver down an existing channel. The channel was passed as the standard
1339 input. TLS is never active on a passed channel; the previous process always
1340 closes it down before passing the connection on.
1342 Otherwise, we have to make a connection to the remote host, and do the
1343 initial protocol exchange.
1345 When running as an MUA wrapper, if the sender or any recipient is rejected,
1346 temporarily or permanently, we force failure for all recipients.
1349 addrlist chain of potential addresses to deliver; only those whose
1350 transport_return field is set to PENDING_DEFER are currently
1351 being processed; others should be skipped - they have either
1352 been delivered to an earlier host or IP address, or been
1353 failed by one of them.
1354 host host to deliver to
1355 host_af AF_INET or AF_INET6
1356 port default TCP/IP port to use, in host byte order
1357 interface interface to bind to, or NULL
1358 tblock transport instance block
1359 message_defer set TRUE if yield is OK, but all addresses were deferred
1360 because of a non-recipient, non-host failure, that is, a
1361 4xx response to MAIL FROM, DATA, or ".". This is a defer
1362 that is specific to the message.
1363 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1364 a second attempt after TLS initialization fails
1366 Returns: OK - the connection was made and the delivery attempted;
1367 the result for each address is in its data block.
1368 DEFER - the connection could not be made, or something failed
1369 while setting up the SMTP session, or there was a
1370 non-message-specific error, such as a timeout.
1371 ERROR - a filter command is specified for this transport,
1372 and there was a problem setting it up; OR helo_data
1373 or add_headers or authenticated_sender is specified
1374 for this transport, and the string failed to expand
1378 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1379 uschar *interface, transport_instance *tblock,
1380 BOOL *message_defer, BOOL suppress_tls)
1383 address_item *sync_addr;
1384 address_item *first_addr = addrlist;
1389 time_t start_delivery_time = time(NULL);
1390 smtp_transport_options_block *ob =
1391 (smtp_transport_options_block *)(tblock->options_block);
1392 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1393 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1395 BOOL send_rset = TRUE;
1396 BOOL send_quit = TRUE;
1397 BOOL setting_up = TRUE;
1398 BOOL completed_address = FALSE;
1401 BOOL pass_message = FALSE;
1402 #ifndef DISABLE_PRDR
1403 BOOL prdr_offered = FALSE;
1407 BOOL utf8_needed = FALSE;
1408 BOOL utf8_offered = FALSE;
1410 BOOL dsn_all_lasthop = TRUE;
1411 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1413 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1414 dns_answer tlsa_dnsa;
1416 smtp_inblock inblock;
1417 smtp_outblock outblock;
1418 int max_rcpt = tblock->max_addresses;
1419 uschar *igquotstr = US"";
1421 #ifdef EXPERIMENTAL_DSN_INFO
1422 uschar *smtp_greeting = NULL;
1423 uschar *helo_response = NULL;
1425 uschar *helo_data = NULL;
1427 uschar *message = NULL;
1428 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1430 uschar buffer[4096];
1431 uschar inbuffer[4096];
1432 uschar outbuffer[4096];
1434 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1436 *message_defer = FALSE;
1437 smtp_command = US"initial connection";
1438 if (max_rcpt == 0) max_rcpt = 999999;
1440 /* Set up the buffer for reading SMTP response packets. */
1442 inblock.buffer = inbuffer;
1443 inblock.buffersize = sizeof(inbuffer);
1444 inblock.ptr = inbuffer;
1445 inblock.ptrend = inbuffer;
1447 /* Set up the buffer for holding SMTP commands while pipelining */
1449 outblock.buffer = outbuffer;
1450 outblock.buffersize = sizeof(outbuffer);
1451 outblock.ptr = outbuffer;
1452 outblock.cmd_count = 0;
1453 outblock.authenticating = FALSE;
1455 /* Reset the parameters of a TLS session. */
1458 tls_out.cipher = NULL; /* the one we may use for this transport */
1459 tls_out.ourcert = NULL;
1460 tls_out.peercert = NULL;
1461 tls_out.peerdn = NULL;
1462 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1465 tls_out.ocsp = OCSP_NOT_REQ;
1467 /* Flip the legacy TLS-related variables over to the outbound set in case
1468 they're used in the context of the transport. Don't bother resetting
1469 afterward as we're in a subprocess. */
1471 tls_modify_variables(&tls_out);
1476 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1482 /* Make a connection to the host if this isn't a continued delivery, and handle
1483 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1484 specially so they can be identified for retries. */
1486 if (continue_hostname == NULL)
1488 /* This puts port into host->port */
1489 inblock.sock = outblock.sock =
1490 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1492 if (inblock.sock < 0)
1494 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1495 NULL, DEFER, FALSE);
1499 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1501 tls_out.dane_verified = FALSE;
1502 tls_out.tlsa_usage = 0;
1504 if (host->dnssec == DS_YES)
1507 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1509 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1510 && dane_required /* do not error on only dane-requested */
1513 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1514 string_sprintf("DANE error: tlsa lookup %s",
1515 rc == DEFER ? "DEFER" : "FAIL"),
1520 else if (dane_required)
1522 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1523 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1529 ob->tls_tempfail_tryclear = FALSE;
1533 /* Expand the greeting message while waiting for the initial response. (Makes
1534 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1535 delayed till here so that $sending_interface and $sending_port are set. */
1537 helo_data = expand_string(ob->helo_data);
1541 uschar * errstr = NULL;
1542 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1544 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1545 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1552 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1553 is nevertheless a reasonably clean way of programming this kind of logic,
1554 where you want to escape on any error. */
1558 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1559 '2', ob->command_timeout);
1560 #ifdef EXPERIMENTAL_DSN_INFO
1561 smtp_greeting = string_copy(buffer);
1563 if (!good_response) goto RESPONSE_FAILED;
1565 #ifndef DISABLE_EVENT
1568 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1569 : host->dnssec==DS_NO ? US"no" : NULL;
1570 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1573 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1574 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1582 /* Now check if the helo_data expansion went well, and sign off cleanly if
1585 if (helo_data == NULL)
1587 uschar *message = string_sprintf("failed to expand helo_data: %s",
1588 expand_string_message);
1589 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1595 /** Debugging without sending a message
1596 addrlist->transport_return = DEFER;
1600 /* Errors that occur after this point follow an SMTP command, which is
1601 left in big_buffer by smtp_write_command() for use in error messages. */
1603 smtp_command = big_buffer;
1605 /* Tell the remote who we are...
1607 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1608 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1609 greeting is of this form. The assumption was that the far end supports it
1610 properly... but experience shows that there are some that give 5xx responses,
1611 even though the banner includes "ESMTP" (there's a bloody-minded one that
1612 says "ESMTP not spoken here"). Cope with that case.
1614 September 2000: Time has passed, and it seems reasonable now to always send
1615 EHLO at the start. It is also convenient to make the change while installing
1618 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1619 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1620 would be no way to send out the mails, so there is now a host list
1621 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1622 PIPELINING problem as well. Maybe it can also be useful to cure other
1623 problems with broken servers.
1625 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1626 Then somebody tried it with a Microsoft mailer... It seems that all other
1627 mailers use upper case for some reason (the RFC is quite clear about case
1628 independence) so, for peace of mind, I gave in. */
1630 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1632 /* Alas; be careful, since this goto is not an error-out, so conceivably
1633 we might set data between here and the target which we assume to exist
1634 and be usable. I can see this coming back to bite us. */
1639 suppress_tls = FALSE;
1640 ob->tls_tempfail_tryclear = FALSE;
1641 smtp_command = US"SSL-on-connect";
1648 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1649 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1651 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1652 ob->command_timeout))
1654 if (errno != 0 || buffer[0] == 0 || lmtp)
1656 #ifdef EXPERIMENTAL_DSN_INFO
1657 helo_response = string_copy(buffer);
1659 goto RESPONSE_FAILED;
1663 #ifdef EXPERIMENTAL_DSN_INFO
1664 helo_response = string_copy(buffer);
1670 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1677 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1679 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1680 '2', ob->command_timeout);
1681 #ifdef EXPERIMENTAL_DSN_INFO
1682 helo_response = string_copy(buffer);
1684 if (!good_response) goto RESPONSE_FAILED;
1687 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1688 lmtp_ignore_quota option was set. */
1690 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1691 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1692 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1694 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1697 tls_offered = esmtp &&
1698 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1699 PCRE_EOPT, NULL, 0) >= 0;
1702 #ifndef DISABLE_PRDR
1703 prdr_offered = esmtp
1704 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1705 PCRE_EOPT, NULL, 0) >= 0
1706 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1709 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1713 if (addrlist->prop.utf8_msg)
1715 utf8_needed = !addrlist->prop.utf8_downcvt
1716 && !addrlist->prop.utf8_downcvt_maybe;
1717 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1718 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1720 utf8_offered = esmtp
1721 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1722 PCRE_EOPT, NULL, 0) >= 0;
1727 /* For continuing deliveries down the same channel, the socket is the standard
1728 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1729 below). Set up the pointer to where subsequent commands will be left, for
1730 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1731 set from the command line if they were set in the process that passed the
1734 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1735 as the contine goes via transport_pass_socket() and doublefork and exec.
1736 It does not wait. Unclear how we keep separate host's responses
1737 separate - we could match up by host ip+port as a bodge. */
1741 inblock.sock = outblock.sock = fileno(stdin);
1742 smtp_command = big_buffer;
1743 host->port = port; /* Record the port that was used */
1746 /* If TLS is available on this connection, whether continued or not, attempt to
1747 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1748 send another EHLO - the server may give a different answer in secure mode. We
1749 use a separate buffer for reading the response to STARTTLS so that if it is
1750 negative, the original EHLO data is available for subsequent analysis, should
1751 the client not be required to use TLS. If the response is bad, copy the buffer
1752 for error analysis. */
1757 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1759 uschar buffer2[4096];
1760 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1763 /* If there is an I/O error, transmission of this message is deferred. If
1764 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1765 false, we also defer. However, if there is a temporary rejection of STARTTLS
1766 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1767 STARTTLS, we carry on. This means we will try to send the message in clear,
1768 unless the host is in hosts_require_tls (tested below). */
1770 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1771 ob->command_timeout))
1773 if (errno != 0 || buffer2[0] == 0 ||
1774 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1776 Ustrncpy(buffer, buffer2, sizeof(buffer));
1777 goto RESPONSE_FAILED;
1781 /* STARTTLS accepted: try to negotiate a TLS session. */
1786 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1787 # ifdef EXPERIMENTAL_DANE
1788 , dane ? &tlsa_dnsa : NULL
1792 /* TLS negotiation failed; give an error. From outside, this function may
1793 be called again to try in clear on a new connection, if the options permit
1794 it for this host. */
1798 # ifdef EXPERIMENTAL_DANE
1799 if (rc == DEFER && dane && !dane_required)
1801 log_write(0, LOG_MAIN, "DANE attempt failed;"
1802 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1803 host->name, host->address);
1809 save_errno = ERRNO_TLSFAILURE;
1810 message = US"failure while setting up TLS session";
1815 /* TLS session is set up */
1817 for (addr = addrlist; addr; addr = addr->next)
1818 if (addr->transport_return == PENDING_DEFER)
1820 addr->cipher = tls_out.cipher;
1821 addr->ourcert = tls_out.ourcert;
1822 addr->peercert = tls_out.peercert;
1823 addr->peerdn = tls_out.peerdn;
1824 addr->ocsp = tls_out.ocsp;
1829 /* if smtps, we'll have smtp_command set to something else; always safe to
1831 smtp_command = big_buffer;
1833 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1834 helo_data is null, we are dealing with a connection that was passed from
1835 another process, and so we won't have expanded helo_data above. We have to
1836 expand it here. $sending_ip_address and $sending_port are set up right at the
1837 start of the Exim process (in exim.c). */
1839 if (tls_out.active >= 0)
1844 if (helo_data == NULL)
1846 helo_data = expand_string(ob->helo_data);
1847 if (helo_data == NULL)
1849 uschar *message = string_sprintf("failed to expand helo_data: %s",
1850 expand_string_message);
1851 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1857 /* For SMTPS we need to wait for the initial OK response. */
1860 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1861 '2', ob->command_timeout);
1862 #ifdef EXPERIMENTAL_DSN_INFO
1863 smtp_greeting = string_copy(buffer);
1865 if (!good_response) goto RESPONSE_FAILED;
1869 greeting_cmd = "EHLO";
1872 greeting_cmd = "HELO";
1874 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1877 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1878 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1880 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1881 '2', ob->command_timeout);
1882 #ifdef EXPERIMENTAL_DSN_INFO
1883 helo_response = string_copy(buffer);
1885 if (!good_response) goto RESPONSE_FAILED;
1888 /* If the host is required to use a secure channel, ensure that we
1892 # ifdef EXPERIMENTAL_DANE
1895 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1898 save_errno = ERRNO_TLSREQUIRED;
1899 message = string_sprintf("a TLS session is required, but %s",
1900 tls_offered? "an attempt to start TLS failed" :
1901 "the server did not offer TLS support");
1904 #endif /*SUPPORT_TLS*/
1906 /* If TLS is active, we have just started it up and re-done the EHLO command,
1907 so its response needs to be analyzed. If TLS is not active and this is a
1908 continued session down a previously-used socket, we haven't just done EHLO, so
1911 if (continue_hostname == NULL
1913 || tls_out.active >= 0
1917 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1918 lmtp_ignore_quota option was set. */
1920 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1921 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1922 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1924 /* If the response to EHLO specified support for the SIZE parameter, note
1925 this, provided size_addition is non-negative. */
1927 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1928 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1929 PCRE_EOPT, NULL, 0) >= 0;
1931 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1932 the current host, esmtp will be false, so PIPELINING can never be used. If
1933 the current host matches hosts_avoid_pipelining, don't do it. */
1935 smtp_use_pipelining = esmtp
1936 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1937 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1938 PCRE_EOPT, NULL, 0) >= 0;
1940 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1941 smtp_use_pipelining? "" : "not ");
1943 #ifndef DISABLE_PRDR
1944 prdr_offered = esmtp
1945 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1946 PCRE_EOPT, NULL, 0) >= 0
1947 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1950 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1954 if (addrlist->prop.utf8_msg)
1955 utf8_offered = esmtp
1956 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1957 PCRE_EOPT, NULL, 0) >= 0;
1960 /* Note if the server supports DSN */
1961 smtp_use_dsn = esmtp
1962 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1963 PCRE_EOPT, NULL, 0) >= 0;
1964 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1966 /* Note if the response to EHLO specifies support for the AUTH extension.
1967 If it has, check that this host is one we want to authenticate to, and do
1968 the business. The host name and address must be available when the
1969 authenticator's client driver is running. */
1971 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1972 ob, esmtp, &inblock, &outblock))
1974 default: goto SEND_QUIT;
1976 case FAIL_SEND: goto SEND_FAILED;
1977 case FAIL: goto RESPONSE_FAILED;
1981 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1982 message-specific. */
1987 /* If this is an international message we need the host to speak SMTPUTF8 */
1988 if (utf8_needed && !utf8_offered)
1990 errno = ERRNO_UTF8_FWD;
1991 goto RESPONSE_FAILED;
1995 /* If there is a filter command specified for this transport, we can now
1996 set it up. This cannot be done until the identify of the host is known. */
1998 if (tblock->filter_command != NULL)
2002 sprintf(CS buffer, "%.50s transport", tblock->name);
2003 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2004 TRUE, DEFER, addrlist, buffer, NULL);
2005 transport_filter_timeout = tblock->filter_timeout;
2007 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2012 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2020 /* For messages that have more than the maximum number of envelope recipients,
2021 we want to send several transactions down the same SMTP connection. (See
2022 comments in deliver.c as to how this reconciles, heuristically, with
2023 remote_max_parallel.) This optimization was added to Exim after the following
2024 code was already working. The simplest way to put it in without disturbing the
2025 code was to use a goto to jump back to this point when there is another
2026 transaction to handle. */
2029 sync_addr = first_addr;
2033 completed_address = FALSE;
2036 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2037 qualification, send it, adding something to the message size to allow for
2038 imprecision and things that get added en route. Exim keeps the number of lines
2039 in a message, so we can give an accurate value for the original message, but we
2040 need some additional to handle added headers. (Double "." characters don't get
2041 included in the count.) */
2048 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2052 #ifndef DISABLE_PRDR
2053 prdr_active = FALSE;
2056 for (addr = first_addr; addr; addr = addr->next)
2057 if (addr->transport_return == PENDING_DEFER)
2059 for (addr = addr->next; addr; addr = addr->next)
2060 if (addr->transport_return == PENDING_DEFER)
2061 { /* at least two recipients to send */
2063 sprintf(CS p, " PRDR"); p += 5;
2072 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
2073 sprintf(CS p, " SMTPUTF8"), p += 9;
2076 /* check if all addresses have lasthop flag */
2077 /* do not send RET and ENVID if true */
2078 for (dsn_all_lasthop = TRUE, addr = first_addr;
2079 address_count < max_rcpt && addr != NULL;
2081 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2083 dsn_all_lasthop = FALSE;
2087 /* Add any DSN flags to the mail command */
2089 if (smtp_use_dsn && !dsn_all_lasthop)
2091 if (dsn_ret == dsn_ret_hdrs)
2093 Ustrcpy(p, " RET=HDRS");
2096 else if (dsn_ret == dsn_ret_full)
2098 Ustrcpy(p, " RET=FULL");
2101 if (dsn_envid != NULL)
2103 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2108 /* If an authenticated_sender override has been specified for this transport
2109 instance, expand it. If the expansion is forced to fail, and there was already
2110 an authenticated_sender for this message, the original value will be used.
2111 Other expansion failures are serious. An empty result is ignored, but there is
2112 otherwise no check - this feature is expected to be used with LMTP and other
2113 cases where non-standard addresses (e.g. without domains) might be required. */
2115 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2121 /* From here until we send the DATA command, we can make use of PIPELINING
2122 if the server host supports it. The code has to be able to check the responses
2123 at any point, for when the buffer fills up, so we write it totally generally.
2124 When PIPELINING is off, each command written reports that it has flushed the
2127 pending_MAIL = TRUE; /* The block starts with MAIL */
2130 uschar * s = return_path;
2132 uschar * errstr = NULL;
2134 /* If we must downconvert, do the from-address here. Remember we had to
2135 for the to-addresses (done below), and also (ugly) for re-doing when building
2136 the delivery log line. */
2138 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2140 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2142 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2146 setflag(addrlist, af_utf8_downcvt);
2150 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2151 "MAIL FROM:<%s>%s\r\n", s, buffer);
2154 mail_command = string_copy(big_buffer); /* Save for later error message */
2158 case -1: /* Transmission error */
2161 case +1: /* Block was sent */
2162 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2163 ob->command_timeout))
2165 if (errno == 0 && buffer[0] == '4')
2167 errno = ERRNO_MAIL4XX;
2168 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2170 goto RESPONSE_FAILED;
2172 pending_MAIL = FALSE;
2176 /* Pass over all the relevant recipient addresses for this host, which are the
2177 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2178 several before we have to read the responses for those seen so far. This
2179 checking is done by a subroutine because it also needs to be done at the end.
2180 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2181 the next one if not all are sent.
2183 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2184 last address because we want to abort if any recipients have any kind of
2185 problem, temporary or permanent. We know that all recipient addresses will have
2186 the PENDING_DEFER status, because only one attempt is ever made, and we know
2187 that max_rcpt will be large, so all addresses will be done at once. */
2189 for (addr = first_addr;
2190 address_count < max_rcpt && addr != NULL;
2197 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2199 if (addr->transport_return != PENDING_DEFER) continue;
2202 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2204 /* Add any DSN flags to the rcpt command and add to the sent string */
2209 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2211 if ((addr->dsn_flags & rf_dsnflags) != 0)
2215 Ustrcpy(p, " NOTIFY=");
2217 for (i = 0; i < 4; i++)
2218 if ((addr->dsn_flags & rf_list[i]) != 0)
2220 if (!first) *p++ = ',';
2222 Ustrcpy(p, rf_names[i]);
2227 if (addr->dsn_orcpt != NULL)
2229 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2235 /* Now send the RCPT command, and process outstanding responses when
2236 necessary. After a timeout on RCPT, we just end the function, leaving the
2237 yield as OK, because this error can often mean that there is a problem with
2238 just one address, so we don't want to delay the host. */
2240 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2244 uschar * dummy_errstr;
2245 if ( testflag(addrlist, af_utf8_downcvt)
2246 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2250 errno = ERRNO_EXPANDFAIL;
2256 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2257 rcpt_addr, igquotstr, buffer);
2259 if (count < 0) goto SEND_FAILED;
2262 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2263 &sync_addr, host, count, ob->address_retry_include_sender,
2264 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2267 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2268 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2271 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2272 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2273 case 0: /* No 2xx or 5xx, but no probs */
2276 case -1: goto END_OFF; /* Timeout on RCPT */
2277 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2279 pending_MAIL = FALSE; /* Dealt with MAIL */
2281 } /* Loop for next address */
2283 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2284 permanently or temporarily. We should have flushed and synced after the last
2289 address_item *badaddr;
2290 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2291 if (badaddr->transport_return != PENDING_OK)
2293 /*XXX could we find a better errno than 0 here? */
2294 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2295 testflag(badaddr, af_pass_message));
2301 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2302 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2303 have a good recipient buffered up if we are pipelining. We don't want to waste
2304 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2305 are pipelining. The responses are all handled by sync_responses(). */
2307 if (ok || (smtp_use_pipelining && !mua_wrapper))
2309 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2310 if (count < 0) goto SEND_FAILED;
2311 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2312 host, count, ob->address_retry_include_sender, pending_MAIL,
2313 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2315 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2316 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2319 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2320 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2321 case 0: break; /* No 2xx or 5xx, but no probs */
2323 case -1: goto END_OFF; /* Timeout on RCPT */
2324 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2328 /* Save the first address of the next batch. */
2332 /* If there were no good recipients (but otherwise there have been no
2333 problems), just set ok TRUE, since we have handled address-specific errors
2334 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2335 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2336 well as body. Set the appropriate timeout value to be used for each chunk.
2337 (Haven't been able to make it work using select() for writing yet.) */
2339 if (!ok) ok = TRUE; else
2341 sigalrm_seen = FALSE;
2342 transport_write_timeout = ob->data_timeout;
2343 smtp_command = US"sending data block"; /* For error messages */
2344 DEBUG(D_transport|D_v)
2345 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2346 transport_count = 0;
2348 #ifndef DISABLE_DKIM
2349 ok = dkim_transport_write_message(addrlist, inblock.sock,
2350 topt_use_crlf | topt_end_dot | topt_escape_headers |
2351 (tblock->body_only? topt_no_headers : 0) |
2352 (tblock->headers_only? topt_no_body : 0) |
2353 (tblock->return_path_add? topt_add_return_path : 0) |
2354 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2355 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2356 0, /* No size limit */
2357 tblock->add_headers, tblock->remove_headers,
2358 US".", US"..", /* Escaping strings */
2359 tblock->rewrite_rules, tblock->rewrite_existflags,
2360 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2361 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2364 ok = transport_write_message(addrlist, inblock.sock,
2365 topt_use_crlf | topt_end_dot | topt_escape_headers |
2366 (tblock->body_only? topt_no_headers : 0) |
2367 (tblock->headers_only? topt_no_body : 0) |
2368 (tblock->return_path_add? topt_add_return_path : 0) |
2369 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2370 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2371 0, /* No size limit */
2372 tblock->add_headers, tblock->remove_headers,
2373 US".", US"..", /* Escaping strings */
2374 tblock->rewrite_rules, tblock->rewrite_existflags);
2377 /* transport_write_message() uses write() because it is called from other
2378 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2379 it can exit with "Broken pipe" as its error. This really means that the
2380 socket got closed at the far end. */
2382 transport_write_timeout = 0; /* for subsequent transports */
2384 /* Failure can either be some kind of I/O disaster (including timeout),
2385 or the failure of a transport filter or the expansion of added headers. */
2389 buffer[0] = 0; /* There hasn't been a response */
2390 goto RESPONSE_FAILED;
2393 /* We used to send the terminating "." explicitly here, but because of
2394 buffering effects at both ends of TCP/IP connections, you don't gain
2395 anything by keeping it separate, so it might as well go in the final
2396 data buffer for efficiency. This is now done by setting the topt_end_dot
2399 smtp_command = US"end of data";
2401 #ifndef DISABLE_PRDR
2402 /* For PRDR we optionally get a partial-responses warning
2403 * followed by the individual responses, before going on with
2404 * the overall response. If we don't get the warning then deal
2405 * with per non-PRDR. */
2408 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2410 if (!ok && errno == 0)
2413 case '2': prdr_active = FALSE;
2416 case '4': errno = ERRNO_DATA4XX;
2417 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2424 /* For non-PRDR SMTP, we now read a single response that applies to the
2425 whole message. If it is OK, then all the addresses have been delivered. */
2429 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2431 if (!ok && errno == 0 && buffer[0] == '4')
2433 errno = ERRNO_DATA4XX;
2434 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2438 /* For LMTP, we get back a response for every RCPT command that we sent;
2439 some may be accepted and some rejected. For those that get a response, their
2440 status is fixed; any that are accepted have been handed over, even if later
2441 responses crash - at least, that's how I read RFC 2033.
2443 If all went well, mark the recipient addresses as completed, record which
2444 host/IPaddress they were delivered to, and cut out RSET when sending another
2445 message down the same channel. Write the completed addresses to the journal
2446 now so that they are recorded in case there is a crash of hardware or
2447 software before the spool gets updated. Also record the final SMTP
2448 confirmation if needed (for SMTP only). */
2453 int delivery_time = (int)(time(NULL) - start_delivery_time);
2455 uschar *conf = NULL;
2458 /* Set up confirmation if needed - applies only to SMTP */
2461 #ifdef DISABLE_EVENT
2462 LOGGING(smtp_confirmation) &&
2467 const uschar *s = string_printing(buffer);
2468 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2469 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2472 /* Process all transported addresses - for LMTP or PRDR, read a status for
2475 for (addr = addrlist; addr != first_addr; addr = addr->next)
2477 if (addr->transport_return != PENDING_OK) continue;
2479 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2480 remaining addresses. Otherwise, it's a return code for just the one
2481 address. For temporary errors, add a retry item for the address so that
2482 it doesn't get tried again too soon. */
2484 #ifndef DISABLE_PRDR
2485 if (lmtp || prdr_active)
2490 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2493 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2494 addr->message = string_sprintf(
2495 #ifndef DISABLE_PRDR
2496 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2498 "LMTP error after %s: %s",
2500 big_buffer, string_printing(buffer));
2501 setflag(addr, af_pass_message); /* Allow message to go to user */
2502 if (buffer[0] == '5')
2503 addr->transport_return = FAIL;
2506 errno = ERRNO_DATA4XX;
2507 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2508 addr->transport_return = DEFER;
2509 #ifndef DISABLE_PRDR
2512 retry_add_item(addr, addr->address_retry_key, 0);
2516 completed_address = TRUE; /* NOW we can set this flag */
2517 if (LOGGING(smtp_confirmation))
2519 const uschar *s = string_printing(buffer);
2520 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2521 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2525 /* SMTP, or success return from LMTP for this address. Pass back the
2526 actual host that was used. */
2528 addr->transport_return = OK;
2529 addr->more_errno = delivery_time;
2530 addr->host_used = host;
2531 addr->special_action = flag;
2532 addr->message = conf;
2533 #ifndef DISABLE_PRDR
2534 if (prdr_active) addr->flags |= af_prdr_used;
2538 #ifndef DISABLE_PRDR
2542 /* Update the journal. For homonymic addresses, use the base address plus
2543 the transport name. See lots of comments in deliver.c about the reasons
2544 for the complications when homonyms are involved. Just carry on after
2545 write error, as it may prove possible to update the spool file later. */
2547 if (testflag(addr, af_homonym))
2548 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2550 sprintf(CS buffer, "%.500s\n", addr->unique);
2552 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2553 len = Ustrlen(CS buffer);
2554 if (write(journal_fd, buffer, len) != len)
2555 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2556 "%s: %s", buffer, strerror(errno));
2560 #ifndef DISABLE_PRDR
2563 /* PRDR - get the final, overall response. For any non-success
2564 upgrade all the address statuses. */
2565 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2569 if(errno == 0 && buffer[0] == '4')
2571 errno = ERRNO_DATA4XX;
2572 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2574 for (addr = addrlist; addr != first_addr; addr = addr->next)
2575 if (buffer[0] == '5' || addr->transport_return == OK)
2576 addr->transport_return = PENDING_OK; /* allow set_errno action */
2577 goto RESPONSE_FAILED;
2580 /* Update the journal, or setup retry. */
2581 for (addr = addrlist; addr != first_addr; addr = addr->next)
2582 if (addr->transport_return == OK)
2584 if (testflag(addr, af_homonym))
2585 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2587 sprintf(CS buffer, "%.500s\n", addr->unique);
2589 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2590 len = Ustrlen(CS buffer);
2591 if (write(journal_fd, buffer, len) != len)
2592 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2593 "%s: %s", buffer, strerror(errno));
2595 else if (addr->transport_return == DEFER)
2596 retry_add_item(addr, addr->address_retry_key, -2);
2600 /* Ensure the journal file is pushed out to disk. */
2602 if (EXIMfsync(journal_fd) < 0)
2603 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2609 /* Handle general (not specific to one address) failures here. The value of ok
2610 is used to skip over this code on the falling through case. A timeout causes a
2611 deferral. Other errors may defer or fail according to the response code, and
2612 may set up a special errno value, e.g. after connection chopped, which is
2613 assumed if errno == 0 and there is no text in the buffer. If control reaches
2614 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2615 the problem is not related to this specific message. */
2620 uschar * set_message;
2626 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2627 buffer, &code, &message, &pass_message);
2635 message = US string_sprintf("send() to %s [%s] failed: %s",
2636 host->name, host->address, strerror(save_errno));
2641 /* This label is jumped to directly when a TLS negotiation has failed,
2642 or was not done for a host for which it is required. Values will be set
2643 in message and save_errno, and setting_up will always be true. Treat as
2644 a temporary error. */
2651 /* If the failure happened while setting up the call, see if the failure was
2652 a 5xx response (this will either be on connection, or following HELO - a 5xx
2653 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2654 never going to accept them. For other errors during setting up (timeouts or
2655 whatever), defer all addresses, and yield DEFER, so that the host is not
2656 tried again for a while. */
2659 ok = FALSE; /* For when reached by GOTO */
2660 set_message = message;
2667 yield = set_rc = DEFER;
2670 /* We want to handle timeouts after MAIL or "." and loss of connection after
2671 "." specially. They can indicate a problem with the sender address or with
2672 the contents of the message rather than a real error on the connection. These
2673 cases are treated in the same way as a 4xx response. This next bit of code
2674 does the classification. */
2683 case ERRNO_UTF8_FWD:
2690 message_error = TRUE;
2694 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2695 Ustrncmp(smtp_command,"end ",4) == 0;
2698 case ERRNO_SMTPCLOSED:
2699 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2703 message_error = FALSE;
2707 /* Handle the cases that are treated as message errors. These are:
2709 (a) negative response or timeout after MAIL
2710 (b) negative response after DATA
2711 (c) negative response or timeout or dropped connection after "."
2712 (d) utf8 support required and not offered
2714 It won't be a negative response or timeout after RCPT, as that is dealt
2715 with separately above. The action in all cases is to set an appropriate
2716 error code for all the addresses, but to leave yield set to OK because the
2717 host itself has not failed. Of course, it might in practice have failed
2718 when we've had a timeout, but if so, we'll discover that at the next
2719 delivery attempt. For a temporary error, set the message_defer flag, and
2720 write to the logs for information if this is not the last host. The error
2721 for the last host will be logged as part of the address's log line. */
2725 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2727 /* If there's an errno, the message contains just the identity of
2732 else /* Anything other than 5 is treated as temporary */
2736 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2737 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2738 msglog_line(host, message);
2739 *message_defer = TRUE;
2743 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2744 ".", or some other transportation error. We defer all addresses and yield
2745 DEFER, except for the case of failed add_headers expansion, or a transport
2746 filter failure, when the yield should be ERROR, to stop it trying other
2752 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2753 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2757 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2758 #ifdef EXPERIMENTAL_DSN_INFO
2759 , smtp_greeting, helo_response
2765 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2766 SMTP session tidily. However, if there were too many addresses to send in one
2767 message (indicated by first_addr being non-NULL) we want to carry on with the
2768 rest of them. Also, it is desirable to send more than one message down the SMTP
2769 connection if there are several waiting, provided we haven't already sent so
2770 many as to hit the configured limit. The function transport_check_waiting looks
2771 for a waiting message and returns its id. Then transport_pass_socket tries to
2772 set up a continued delivery by passing the socket on to another process. The
2773 variable send_rset is FALSE if a message has just been successfully transfered.
2775 If we are already sending down a continued channel, there may be further
2776 addresses not yet delivered that are aimed at the same host, but which have not
2777 been passed in this run of the transport. In this case, continue_more will be
2778 true, and all we should do is send RSET if necessary, and return, leaving the
2781 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2782 do not want to continue with other messages down the same channel, because that
2783 can lead to looping between two or more messages, all with the same,
2784 temporarily failing address(es). [The retry information isn't updated yet, so
2785 new processes keep on trying.] We probably also don't want to try more of this
2786 message's addresses either.
2788 If we have started a TLS session, we have to end it before passing the
2789 connection to a new process. However, not all servers can handle this (Exim
2790 can), so we do not pass such a connection on if the host matches
2791 hosts_nopass_tls. */
2794 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2795 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2796 continue_more, yield, (first_addr == NULL)? "":"not ");
2798 if (completed_address && ok && send_quit)
2801 smtp_compare_t t_compare;
2803 t_compare.tblock = tblock;
2804 t_compare.current_sender_address = sender_address;
2806 if ( first_addr != NULL
2808 || ( ( tls_out.active < 0
2809 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2812 transport_check_waiting(tblock->name, host->name,
2813 tblock->connection_max_messages, new_message_id, &more,
2814 (oicf)smtp_are_same_identities, (void*)&t_compare)
2822 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2824 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2825 host->address, strerror(save_errno));
2828 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2829 ob->command_timeout)))
2832 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2836 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2837 host->name, host->address, msg);
2842 /* Either RSET was not needed, or it succeeded */
2846 if (first_addr != NULL) /* More addresses still to be sent */
2847 { /* in this run of the transport */
2848 continue_sequence++; /* Causes * in logging */
2851 if (continue_more) return yield; /* More addresses for another run */
2853 /* Pass the socket to a new Exim process. Before doing so, we must shut
2854 down TLS. Not all MTAs allow for the continuation of the SMTP session
2855 when TLS is shut down. We test for this by sending a new EHLO. If we
2856 don't get a good response, we don't attempt to pass the socket on. */
2859 if (tls_out.active >= 0)
2861 tls_close(FALSE, TRUE);
2865 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2866 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2867 ob->command_timeout);
2871 /* If the socket is successfully passed, we musn't send QUIT (or
2872 indeed anything!) from here. */
2874 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2875 propagate it from the initial
2877 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2878 new_message_id, inblock.sock))
2884 /* If RSET failed and there are addresses left, they get deferred. */
2886 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2887 #ifdef EXPERIMENTAL_DSN_INFO
2888 , smtp_greeting, helo_response
2894 /* End off tidily with QUIT unless the connection has died or the socket has
2895 been passed to another process. There has been discussion on the net about what
2896 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2897 to wait for a response, but on the other hand, there isn't anything one can do
2898 with an error response, other than log it. Exim used to do that. However,
2899 further discussion suggested that it is positively advantageous not to wait for
2900 the response, but to close the session immediately. This is supposed to move
2901 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2902 load from the server. (Hosts that are both servers and clients may not see much
2903 difference, of course.) Further discussion indicated that this was safe to do
2904 on Unix systems which have decent implementations of TCP/IP that leave the
2905 connection around for a while (TIME_WAIT) after the application has gone away.
2906 This enables the response sent by the server to be properly ACKed rather than
2907 timed out, as can happen on broken TCP/IP implementations on other OS.
2909 This change is being made on 31-Jul-98. After over a year of trouble-free
2910 operation, the old commented-out code was removed on 17-Sep-99. */
2913 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2918 tls_close(FALSE, TRUE);
2921 /* Close the socket, and return the appropriate value, first setting
2922 works because the NULL setting is passed back to the calling process, and
2923 remote_max_parallel is forced to 1 when delivering over an existing connection,
2925 If all went well and continue_more is set, we shouldn't actually get here if
2926 there are further addresses, as the return above will be taken. However,
2927 writing RSET might have failed, or there may be other addresses whose hosts are
2928 specified in the transports, and therefore not visible at top level, in which
2929 case continue_more won't get set. */
2931 (void)close(inblock.sock);
2933 #ifndef DISABLE_EVENT
2934 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2937 continue_transport = NULL;
2938 continue_hostname = NULL;
2945 /*************************************************
2946 * Closedown entry point *
2947 *************************************************/
2949 /* This function is called when exim is passed an open smtp channel
2950 from another incarnation, but the message which it has been asked
2951 to deliver no longer exists. The channel is on stdin.
2953 We might do fancy things like looking for another message to send down
2954 the channel, but if the one we sought has gone, it has probably been
2955 delivered by some other process that itself will seek further messages,
2956 so just close down our connection.
2958 Argument: pointer to the transport instance block
2963 smtp_transport_closedown(transport_instance *tblock)
2965 smtp_transport_options_block *ob =
2966 (smtp_transport_options_block *)(tblock->options_block);
2967 smtp_inblock inblock;
2968 smtp_outblock outblock;
2970 uschar inbuffer[4096];
2971 uschar outbuffer[16];
2973 inblock.sock = fileno(stdin);
2974 inblock.buffer = inbuffer;
2975 inblock.buffersize = sizeof(inbuffer);
2976 inblock.ptr = inbuffer;
2977 inblock.ptrend = inbuffer;
2979 outblock.sock = inblock.sock;
2980 outblock.buffersize = sizeof(outbuffer);
2981 outblock.buffer = outbuffer;
2982 outblock.ptr = outbuffer;
2983 outblock.cmd_count = 0;
2984 outblock.authenticating = FALSE;
2986 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2987 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2988 ob->command_timeout);
2989 (void)close(inblock.sock);
2994 /*************************************************
2995 * Prepare addresses for delivery *
2996 *************************************************/
2998 /* This function is called to flush out error settings from previous delivery
2999 attempts to other hosts. It also records whether we got here via an MX record
3000 or not in the more_errno field of the address. We are interested only in
3001 addresses that are still marked DEFER - others may have got delivered to a
3002 previously considered IP address. Set their status to PENDING_DEFER to indicate
3003 which ones are relevant this time.
3006 addrlist the list of addresses
3007 host the host we are delivering to
3009 Returns: the first address for this delivery
3012 static address_item *
3013 prepare_addresses(address_item *addrlist, host_item *host)
3015 address_item *first_addr = NULL;
3017 for (addr = addrlist; addr != NULL; addr = addr->next)
3018 if (addr->transport_return == DEFER)
3020 if (first_addr == NULL) first_addr = addr;
3021 addr->transport_return = PENDING_DEFER;
3022 addr->basic_errno = 0;
3023 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3024 addr->message = NULL;
3026 addr->cipher = NULL;
3027 addr->ourcert = NULL;
3028 addr->peercert = NULL;
3029 addr->peerdn = NULL;
3030 addr->ocsp = OCSP_NOT_REQ;
3032 #ifdef EXPERIMENTAL_DSN_INFO
3033 addr->smtp_greeting = NULL;
3034 addr->helo_response = NULL;
3042 /*************************************************
3043 * Main entry point *
3044 *************************************************/
3046 /* See local README for interface details. As this is a remote transport, it is
3047 given a chain of addresses to be delivered in one connection, if possible. It
3048 always returns TRUE, indicating that each address has its own independent
3049 status set, except if there is a setting up problem, in which case it returns
3053 smtp_transport_entry(
3054 transport_instance *tblock, /* data for this instantiation */
3055 address_item *addrlist) /* addresses we are working on */
3059 int hosts_defer = 0;
3061 int hosts_looked_up = 0;
3062 int hosts_retry = 0;
3063 int hosts_serial = 0;
3064 int hosts_total = 0;
3065 int total_hosts_tried = 0;
3067 BOOL expired = TRUE;
3068 BOOL continuing = continue_hostname != NULL;
3069 uschar *expanded_hosts = NULL;
3071 uschar *tid = string_sprintf("%s transport", tblock->name);
3072 smtp_transport_options_block *ob =
3073 (smtp_transport_options_block *)(tblock->options_block);
3074 host_item *hostlist = addrlist->host_list;
3075 host_item *host = NULL;
3079 debug_printf("%s transport entered\n", tblock->name);
3080 for (addr = addrlist; addr != NULL; addr = addr->next)
3081 debug_printf(" %s\n", addr->address);
3082 if (continuing) debug_printf("already connected to %s [%s]\n",
3083 continue_hostname, continue_host_address);
3086 /* Set the flag requesting that these hosts be added to the waiting
3087 database if the delivery fails temporarily or if we are running with
3088 queue_smtp or a 2-stage queue run. This gets unset for certain
3089 kinds of error, typically those that are specific to the message. */
3091 update_waiting = TRUE;
3093 /* If a host list is not defined for the addresses - they must all have the
3094 same one in order to be passed to a single transport - or if the transport has
3095 a host list with hosts_override set, use the host list supplied with the
3096 transport. It is an error for this not to exist. */
3098 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3100 if (ob->hosts == NULL)
3102 addrlist->message = string_sprintf("%s transport called with no hosts set",
3104 addrlist->transport_return = PANIC;
3105 return FALSE; /* Only top address has status */
3108 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3111 /* If the transport's host list contains no '$' characters, and we are not
3112 randomizing, it is fixed and therefore a chain of hosts can be built once
3113 and for all, and remembered for subsequent use by other calls to this
3114 transport. If, on the other hand, the host list does contain '$', or we are
3115 randomizing its order, we have to rebuild it each time. In the fixed case,
3116 as the hosts string will never be used again, it doesn't matter that we
3117 replace all the : characters with zeros. */
3119 if (ob->hostlist == NULL)
3121 uschar *s = ob->hosts;
3123 if (Ustrchr(s, '$') != NULL)
3125 if (!(expanded_hosts = expand_string(s)))
3127 addrlist->message = string_sprintf("failed to expand list of hosts "
3128 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3129 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3130 return FALSE; /* Only top address has status */
3132 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3133 "\"%s\"\n", s, expanded_hosts);
3137 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3139 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3141 /* Check that the expansion yielded something useful. */
3142 if (hostlist == NULL)
3145 string_sprintf("%s transport has empty hosts setting", tblock->name);
3146 addrlist->transport_return = PANIC;
3147 return FALSE; /* Only top address has status */
3150 /* If there was no expansion of hosts, save the host list for
3153 if (!expanded_hosts) ob->hostlist = hostlist;
3156 /* This is not the first time this transport has been run in this delivery;
3157 the host list was built previously. */
3160 hostlist = ob->hostlist;
3163 /* The host list was supplied with the address. If hosts_randomize is set, we
3164 must sort it into a random order if it did not come from MX records and has not
3165 already been randomized (but don't bother if continuing down an existing
3168 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3170 host_item *newlist = NULL;
3171 while (hostlist != NULL)
3173 host_item *h = hostlist;
3174 hostlist = hostlist->next;
3176 h->sort_key = random_number(100);
3178 if (newlist == NULL)
3183 else if (h->sort_key < newlist->sort_key)
3190 host_item *hh = newlist;
3191 while (hh->next != NULL)
3193 if (h->sort_key < hh->next->sort_key) break;
3201 hostlist = addrlist->host_list = newlist;
3204 /* Sort out the default port. */
3206 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3208 /* For each host-plus-IP-address on the list:
3210 . If this is a continued delivery and the host isn't the one with the
3211 current connection, skip.
3213 . If the status is unusable (i.e. previously failed or retry checked), skip.
3215 . If no IP address set, get the address, either by turning the name into
3216 an address, calling gethostbyname if gethostbyname is on, or by calling
3217 the DNS. The DNS may yield multiple addresses, in which case insert the
3218 extra ones into the list.
3220 . Get the retry data if not previously obtained for this address and set the
3221 field which remembers the state of this address. Skip if the retry time is
3222 not reached. If not, remember whether retry data was found. The retry string
3223 contains both the name and the IP address.
3225 . Scan the list of addresses and mark those whose status is DEFER as
3226 PENDING_DEFER. These are the only ones that will be processed in this cycle
3229 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3230 Some addresses may be successfully delivered, others may fail, and yet
3231 others may get temporary errors and so get marked DEFER.
3233 . The return from the delivery attempt is OK if a connection was made and a
3234 valid SMTP dialogue was completed. Otherwise it is DEFER.
3236 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3238 . If fail to connect, or other defer state, add a retry item.
3240 . If there are any addresses whose status is still DEFER, carry on to the
3241 next host/IPaddress, unless we have tried the number of hosts given
3242 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3243 there is some fancy logic for hosts_max_try that means its limit can be
3244 overstepped in some circumstances.
3246 If we get to the end of the list, all hosts have deferred at least one address,
3247 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3248 delivery attempt to those hosts whose last try was before the arrival time of
3249 the current message. To cope with this, we have to go round the loop a second
3250 time. After that, set the status and error data for any addresses that haven't
3251 had it set already. */
3253 for (cutoff_retry = 0; expired &&
3254 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3257 host_item *nexthost = NULL;
3258 int unexpired_hosts_tried = 0;
3260 for (host = hostlist;
3262 unexpired_hosts_tried < ob->hosts_max_try &&
3263 total_hosts_tried < ob->hosts_max_try_hardlimit;
3269 BOOL serialized = FALSE;
3270 BOOL host_is_expired = FALSE;
3271 BOOL message_defer = FALSE;
3272 BOOL some_deferred = FALSE;
3273 address_item *first_addr = NULL;
3274 uschar *interface = NULL;
3275 uschar *retry_host_key = NULL;
3276 uschar *retry_message_key = NULL;
3277 uschar *serialize_key = NULL;
3279 /* Default next host is next host. :-) But this can vary if the
3280 hosts_max_try limit is hit (see below). It may also be reset if a host
3281 address is looked up here (in case the host was multihomed). */
3283 nexthost = host->next;
3285 /* If the address hasn't yet been obtained from the host name, look it up
3286 now, unless the host is already marked as unusable. If it is marked as
3287 unusable, it means that the router was unable to find its IP address (in
3288 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3289 the lookup failed last time. We don't get this far if *all* MX records
3290 point to non-existent hosts; that is treated as a hard error.
3292 We can just skip this host entirely. When the hosts came from the router,
3293 the address will timeout based on the other host(s); when the address is
3294 looked up below, there is an explicit retry record added.
3296 Note that we mustn't skip unusable hosts if the address is not unset; they
3297 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3299 if (host->address == NULL)
3301 int new_port, flags;
3304 if (host->status >= hstatus_unusable)
3306 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3311 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3313 /* The host name is permitted to have an attached port. Find it, and
3314 strip it from the name. Just remember it for now. */
3316 new_port = host_item_get_port(host);
3318 /* Count hosts looked up */
3322 /* Find by name if so configured, or if it's an IP address. We don't
3323 just copy the IP address, because we need the test-for-local to happen. */
3325 flags = HOST_FIND_BY_A;
3326 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3327 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3329 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3330 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3332 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3333 &ob->dnssec, /* domains for request/require */
3336 /* Update the host (and any additional blocks, resulting from
3337 multihoming) with a host-specific port, if any. */
3339 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3341 /* Failure to find the host at this time (usually DNS temporary failure)
3342 is really a kind of routing failure rather than a transport failure.
3343 Therefore we add a retry item of the routing kind, not to stop us trying
3344 to look this name up here again, but to ensure the address gets timed
3345 out if the failures go on long enough. A complete failure at this point
3346 commonly points to a configuration error, but the best action is still
3347 to carry on for the next host. */
3349 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3351 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3353 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3354 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3355 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3356 host->status = hstatus_unusable;
3358 for (addr = addrlist; addr != NULL; addr = addr->next)
3360 if (addr->transport_return != DEFER) continue;
3361 addr->basic_errno = ERRNO_UNKNOWNHOST;
3363 string_sprintf("failed to lookup IP address for %s", host->name);
3368 /* If the host is actually the local host, we may have a problem, or
3369 there may be some cunning configuration going on. In the problem case,
3370 log things and give up. The default transport status is already DEFER. */
3372 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3374 for (addr = addrlist; addr != NULL; addr = addr->next)
3376 addr->basic_errno = 0;
3377 addr->message = string_sprintf("%s transport found host %s to be "
3378 "local", tblock->name, host->name);
3382 } /* End of block for IP address lookup */
3384 /* If this is a continued delivery, we are interested only in the host
3385 which matches the name of the existing open channel. The check is put
3386 here after the local host lookup, in case the name gets expanded as a
3387 result of the lookup. Set expired FALSE, to save the outer loop executing
3390 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3391 Ustrcmp(continue_host_address, host->address) != 0))
3394 continue; /* With next host */
3397 /* Reset the default next host in case a multihomed host whose addresses
3398 are not looked up till just above added to the host list. */
3400 nexthost = host->next;
3402 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3403 domain is in queue_smtp_domains, we don't actually want to attempt any
3404 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3405 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3406 were not in it. We don't want to hold up all SMTP deliveries! Except when
3407 doing a two-stage queue run, don't do this if forcing. */
3409 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3410 match_isinlist(addrlist->domain,
3411 (const uschar **)&queue_smtp_domains, 0,
3412 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3415 for (addr = addrlist; addr != NULL; addr = addr->next)
3417 if (addr->transport_return != DEFER) continue;
3418 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3420 continue; /* With next host */
3423 /* Count hosts being considered - purely for an intelligent comment
3424 if none are usable. */
3428 /* Set $host and $host address now in case they are needed for the
3429 interface expansion or the serialize_hosts check; they remain set if an
3430 actual delivery happens. */
3432 deliver_host = host->name;
3433 deliver_host_address = host->address;
3434 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3435 : host->dnssec == DS_NO ? US"no"
3438 /* Set up a string for adding to the retry key if the port number is not
3439 the standard SMTP port. A host may have its own port setting that overrides
3442 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3444 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3446 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3447 string is set, even if constant (as different transports can have different
3448 constant settings), we must add it to the key that is used for retries,
3449 because connections to the same host from a different interface should be
3450 treated separately. */
3452 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3453 if ((rs = ob->interface) && *rs)
3455 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3457 pistring = string_sprintf("%s/%s", pistring, interface);
3460 /* The first time round the outer loop, check the status of the host by
3461 inspecting the retry data. The second time round, we are interested only
3462 in expired hosts that haven't been tried since this message arrived. */
3464 if (cutoff_retry == 0)
3467 /* Ensure the status of the address is set by checking retry data if
3468 necessary. There may be host-specific retry data (applicable to all
3469 messages) and also data for retries of a specific message at this host.
3470 If either of these retry records are actually read, the keys used are
3471 returned to save recomputing them later. */
3473 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3474 US"retry_include_ip_address", ob->retry_include_ip_address,
3475 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3476 continue; /* with next host */
3478 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3479 incl_ip, &retry_host_key, &retry_message_key);
3481 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3482 (host->address == NULL)? US"" : host->address, pistring,
3483 (host->status == hstatus_usable)? "usable" :
3484 (host->status == hstatus_unusable)? "unusable" :
3485 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3487 /* Skip this address if not usable at this time, noting if it wasn't
3488 actually expired, both locally and in the address. */
3490 switch (host->status)
3492 case hstatus_unusable:
3494 setflag(addrlist, af_retry_skipped);
3497 case hstatus_unusable_expired:
3500 case hwhy_retry: hosts_retry++; break;
3501 case hwhy_failed: hosts_fail++; break;
3502 case hwhy_deferred: hosts_defer++; break;
3505 /* If there was a retry message key, implying that previously there
3506 was a message-specific defer, we don't want to update the list of
3507 messages waiting for these hosts. */
3509 if (retry_message_key != NULL) update_waiting = FALSE;
3510 continue; /* With the next host or IP address */
3514 /* Second time round the loop: if the address is set but expired, and
3515 the message is newer than the last try, let it through. */
3519 if (host->address == NULL ||
3520 host->status != hstatus_unusable_expired ||
3521 host->last_try > received_time)
3524 debug_printf("trying expired host %s [%s]%s\n",
3525 host->name, host->address, pistring);
3526 host_is_expired = TRUE;
3529 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3530 it remains TRUE only if all hosts are expired and none are actually tried.
3535 /* If this host is listed as one to which access must be serialized,
3536 see if another Exim process has a connection to it, and if so, skip
3537 this host. If not, update the database to record our connection to it
3538 and remember this for later deletion. Do not do any of this if we are
3539 sending the message down a pre-existing connection. */
3542 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3544 serialize_key = string_sprintf("host-serialize-%s", host->name);
3545 if (!enq_start(serialize_key, 1))
3548 debug_printf("skipping host %s because another Exim process "
3549 "is connected to it\n", host->name);
3556 /* OK, we have an IP address that is not waiting for its retry time to
3557 arrive (it might be expired) OR (second time round the loop) we have an
3558 expired host that hasn't been tried since the message arrived. Have a go
3559 at delivering the message to it. First prepare the addresses by flushing
3560 out the result of previous attempts, and finding the first address that
3561 is still to be delivered. */
3563 first_addr = prepare_addresses(addrlist, host);
3565 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3566 message_id, host->name, host->address, addrlist->address,
3567 (addrlist->next == NULL)? "" : ", ...");
3569 set_process_info("delivering %s to %s [%s] (%s%s)",
3570 message_id, host->name, host->address, addrlist->address,
3571 (addrlist->next == NULL)? "" : ", ...");
3573 /* This is not for real; don't do the delivery. If there are
3574 any remaining hosts, list them. */
3579 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3580 for (addr = addrlist; addr != NULL; addr = addr->next)
3582 addr->host_used = host;
3583 addr->special_action = '*';
3584 addr->message = US"delivery bypassed by -N option";
3588 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3589 "*** host and remaining hosts:\n", tblock->name);
3590 for (host2 = host; host2 != NULL; host2 = host2->next)
3591 debug_printf(" %s [%s]\n", host2->name,
3592 (host2->address == NULL)? US"unset" : host2->address);
3597 /* This is for real. If the host is expired, we don't count it for
3598 hosts_max_retry. This ensures that all hosts must expire before an address
3599 is timed out, unless hosts_max_try_hardlimit (which protects against
3600 lunatic DNS configurations) is reached.
3602 If the host is not expired and we are about to hit the hosts_max_retry
3603 limit, check to see if there is a subsequent hosts with a different MX
3604 value. If so, make that the next host, and don't count this one. This is a
3605 heuristic to make sure that different MXs do get tried. With a normal kind
3606 of retry rule, they would get tried anyway when the earlier hosts were
3607 delayed, but if the domain has a "retry every time" type of rule - as is
3608 often used for the the very large ISPs, that won't happen. */
3613 /* Make a copy of the host if it is local to this invocation
3614 of the transport. */
3618 thost = store_get(sizeof(host_item));
3620 thost->name = string_copy(host->name);
3621 thost->address = string_copy(host->address);
3626 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3630 debug_printf("hosts_max_try limit reached with this host\n");
3631 for (h = host; h; h = h->next) if (h->mx != host->mx)
3634 unexpired_hosts_tried--;
3635 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3636 "and will be tried\n");
3641 /* Attempt the delivery. */
3643 total_hosts_tried++;
3644 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3645 &message_defer, FALSE);
3648 OK => connection made, each address contains its result;
3649 message_defer is set for message-specific defers (when all
3650 recipients are marked defer)
3651 DEFER => there was a non-message-specific delivery problem;
3652 ERROR => there was a problem setting up the arguments for a filter,
3653 or there was a problem with expanding added headers
3656 /* If the result is not OK, there was a non-message-specific problem.
3657 If the result is DEFER, we need to write to the logs saying what happened
3658 for this particular host, except in the case of authentication and TLS
3659 failures, where the log has already been written. If all hosts defer a
3660 general message is written at the end. */
3662 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3663 first_addr->basic_errno != ERRNO_TLSFAILURE)
3664 write_logs(first_addr, host);
3666 #ifndef DISABLE_EVENT
3668 deferred_event_raise(first_addr, host);
3671 /* If STARTTLS was accepted, but there was a failure in setting up the
3672 TLS session (usually a certificate screwup), and the host is not in
3673 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3674 TLS forcibly turned off. We have to start from scratch with a new SMTP
3675 connection. That's why the retry is done from here, not from within
3676 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3677 session, so the in-clear transmission after those errors, if permitted,
3678 happens inside smtp_deliver().] */
3682 && first_addr->basic_errno == ERRNO_TLSFAILURE
3683 && ob->tls_tempfail_tryclear
3684 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3687 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3688 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3689 first_addr = prepare_addresses(addrlist, host);
3690 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3691 &message_defer, TRUE);
3692 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3693 write_logs(first_addr, host);
3694 # ifndef DISABLE_EVENT
3696 deferred_event_raise(first_addr, host);
3699 #endif /*SUPPORT_TLS*/
3702 /* Delivery attempt finished */
3704 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3707 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3708 message_id, host->name, host->address, addrlist->address,
3709 (addrlist->next == NULL)? "" : " (& others)", rs);
3711 /* Release serialization if set up */
3713 if (serialized) enq_end(serialize_key);
3715 /* If the result is DEFER, or if a host retry record is known to exist, we
3716 need to add an item to the retry chain for updating the retry database
3717 at the end of delivery. We only need to add the item to the top address,
3718 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3719 for any other delivery attempts using the same address. (It is copied into
3720 the unusable tree at the outer level, so even if different address blocks
3721 contain the same address, it still won't get tried again.) */
3723 if (rc == DEFER || retry_host_key != NULL)
3725 int delete_flag = (rc != DEFER)? rf_delete : 0;
3726 if (retry_host_key == NULL)
3729 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3730 US"retry_include_ip_address", ob->retry_include_ip_address,
3731 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3732 incl_ip = TRUE; /* error; use most-specific retry record */
3734 retry_host_key = incl_ip ?
3735 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3736 string_sprintf("T:%S%s", host->name, pistring);
3739 /* If a delivery of another message over an existing SMTP connection
3740 yields DEFER, we do NOT set up retry data for the host. This covers the
3741 case when there are delays in routing the addresses in the second message
3742 that are so long that the server times out. This is alleviated by not
3743 routing addresses that previously had routing defers when handling an
3744 existing connection, but even so, this case may occur (e.g. if a
3745 previously happily routed address starts giving routing defers). If the
3746 host is genuinely down, another non-continued message delivery will
3747 notice it soon enough. */
3749 if (delete_flag != 0 || !continuing)
3750 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3752 /* We may have tried an expired host, if its retry time has come; ensure
3753 the status reflects the expiry for the benefit of any other addresses. */
3757 host->status = (host_is_expired)?
3758 hstatus_unusable_expired : hstatus_unusable;
3759 host->why = hwhy_deferred;
3763 /* If message_defer is set (host was OK, but every recipient got deferred
3764 because of some message-specific problem), or if that had happened
3765 previously so that a message retry key exists, add an appropriate item
3766 to the retry chain. Note that if there was a message defer but now there is
3767 a host defer, the message defer record gets deleted. That seems perfectly
3768 reasonable. Also, stop the message from being remembered as waiting
3769 for specific hosts. */
3771 if (message_defer || retry_message_key != NULL)
3773 int delete_flag = message_defer? 0 : rf_delete;
3774 if (retry_message_key == NULL)
3777 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3778 US"retry_include_ip_address", ob->retry_include_ip_address,
3779 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3780 incl_ip = TRUE; /* error; use most-specific retry record */
3782 retry_message_key = incl_ip ?
3783 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3785 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3787 retry_add_item(addrlist, retry_message_key,
3788 rf_message | rf_host | delete_flag);
3789 update_waiting = FALSE;
3792 /* Any return other than DEFER (that is, OK or ERROR) means that the
3793 addresses have got their final statuses filled in for this host. In the OK
3794 case, see if any of them are deferred. */
3797 for (addr = addrlist; addr; addr = addr->next)
3798 if (addr->transport_return == DEFER)
3800 some_deferred = TRUE;
3804 /* If no addresses deferred or the result was ERROR, return. We do this for
3805 ERROR because a failing filter set-up or add_headers expansion is likely to
3806 fail for any host we try. */
3808 if (rc == ERROR || (rc == OK && !some_deferred))
3810 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3811 return TRUE; /* Each address has its status */
3814 /* If the result was DEFER or some individual addresses deferred, let
3815 the loop run to try other hosts with the deferred addresses, except for the
3816 case when we were trying to deliver down an existing channel and failed.
3817 Don't try any other hosts in this case. */
3819 if (continuing) break;
3821 /* If the whole delivery, or some individual addresses, were deferred and
3822 there are more hosts that could be tried, do not count this host towards
3823 the hosts_max_try limit if the age of the message is greater than the
3824 maximum retry time for this host. This means we may try try all hosts,
3825 ignoring the limit, when messages have been around for some time. This is
3826 important because if we don't try all hosts, the address will never time
3827 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3829 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3832 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3834 if (retry != NULL && retry->rules != NULL)
3836 retry_rule *last_rule;
3837 for (last_rule = retry->rules;
3838 last_rule->next != NULL;
3839 last_rule = last_rule->next);
3840 timedout = time(NULL) - received_time > last_rule->timeout;
3842 else timedout = TRUE; /* No rule => timed out */
3846 unexpired_hosts_tried--;
3847 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3848 "hosts_max_try (message older than host's retry time)\n");
3851 } /* End of loop for trying multiple hosts. */
3853 /* This is the end of the loop that repeats iff expired is TRUE and
3854 ob->delay_after_cutoff is FALSE. The second time round we will
3855 try those hosts that haven't been tried since the message arrived. */
3859 debug_printf("all IP addresses skipped or deferred at least one address\n");
3860 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3861 debug_printf("retrying IP addresses not tried since message arrived\n");
3866 /* Get here if all IP addresses are skipped or defer at least one address. In
3867 MUA wrapper mode, this will happen only for connection or other non-message-
3868 specific failures. Force the delivery status for all addresses to FAIL. */
3872 for (addr = addrlist; addr != NULL; addr = addr->next)
3873 addr->transport_return = FAIL;
3877 /* In the normal, non-wrapper case, add a standard message to each deferred
3878 address if there hasn't been an error, that is, if it hasn't actually been
3879 tried this time. The variable "expired" will be FALSE if any deliveries were
3880 actually tried, or if there was at least one host that was not expired. That
3881 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3882 a delivery has been tried, an error code will be set, and the failing of the
3883 message is handled by the retry code later.
3885 If queue_smtp is set, or this transport was called to send a subsequent message
3886 down an existing TCP/IP connection, and something caused the host not to be
3887 found, we end up here, but can detect these cases and handle them specially. */
3889 for (addr = addrlist; addr != NULL; addr = addr->next)
3891 /* If host is not NULL, it means that we stopped processing the host list
3892 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3893 means we need to behave as if some hosts were skipped because their retry
3894 time had not come. Specifically, this prevents the address from timing out.
3895 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3896 hosts were tried. */
3900 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3903 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3904 "hosts were tried\n");
3909 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3910 setflag(addr, af_retry_skipped);
3914 if (queue_smtp) /* no deliveries attempted */
3916 addr->transport_return = DEFER;
3917 addr->basic_errno = 0;
3918 addr->message = US"SMTP delivery explicitly queued";
3921 else if (addr->transport_return == DEFER &&
3922 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3923 addr->message == NULL)
3925 addr->basic_errno = ERRNO_HRETRY;
3926 if (continue_hostname != NULL)
3928 addr->message = US"no host found for existing SMTP connection";
3932 setflag(addr, af_pass_message); /* This is not a security risk */
3933 addr->message = (ob->delay_after_cutoff)?
3934 US"retry time not reached for any host after a long failure period" :
3935 US"all hosts have been failing for a long time and were last tried "
3936 "after this message arrived";
3938 /* If we are already using fallback hosts, or there are no fallback hosts
3939 defined, convert the result to FAIL to cause a bounce. */
3941 if (addr->host_list == addr->fallback_hosts ||
3942 addr->fallback_hosts == NULL)
3943 addr->transport_return = FAIL;
3947 if (hosts_retry == hosts_total)
3948 addr->message = US"retry time not reached for any host";
3949 else if (hosts_fail == hosts_total)
3950 addr->message = US"all host address lookups failed permanently";
3951 else if (hosts_defer == hosts_total)
3952 addr->message = US"all host address lookups failed temporarily";
3953 else if (hosts_serial == hosts_total)
3954 addr->message = US"connection limit reached for all hosts";
3955 else if (hosts_fail+hosts_defer == hosts_total)
3956 addr->message = US"all host address lookups failed";
3957 else addr->message = US"some host address lookups failed and retry time "
3958 "not reached for other hosts or connection limit reached";
3963 /* Update the database which keeps information about which messages are waiting
3964 for which hosts to become available. For some message-specific errors, the
3965 update_waiting flag is turned off because we don't want follow-on deliveries in
3966 those cases. If this transport instance is explicitly limited to one message
3967 per connection then follow-on deliveries are not possible and there's no need
3968 to create/update the per-transport wait-<transport_name> database. */
3970 if (update_waiting && tblock->connection_max_messages != 1)
3971 transport_update_waiting(hostlist, tblock->name);
3975 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3977 return TRUE; /* Each address has its status */
3982 /* End of transport/smtp.c */