1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
193 smtp_transport_options_block smtp_transport_option_defaults = {0};
194 void smtp_transport_init(transport_instance *tblock) {}
195 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
196 void smtp_transport_closedown(transport_instance *tblock) {}
198 #else /*!MACRO_PREDEF*/
201 /* Default private options block for the smtp transport. */
203 smtp_transport_options_block smtp_transport_option_defaults = {
205 NULL, /* fallback_hosts */
207 NULL, /* fallback_hostlist */
208 NULL, /* authenticated_sender */
209 US"$primary_hostname", /* helo_data */
210 NULL, /* interface */
212 US"smtp", /* protocol */
214 NULL, /* serialize_hosts */
215 NULL, /* hosts_try_auth */
216 NULL, /* hosts_require_auth */
217 US"*", /* hosts_try_chunking */
218 #ifdef EXPERIMENTAL_DANE
219 NULL, /* hosts_try_dane */
220 NULL, /* hosts_require_dane */
222 NULL, /* hosts_try_fastopen */
224 US"*", /* hosts_try_prdr */
227 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
228 NULL, /* hosts_require_ocsp */
230 NULL, /* hosts_require_tls */
231 NULL, /* hosts_avoid_tls */
232 NULL, /* hosts_verify_avoid_tls */
233 NULL, /* hosts_avoid_pipelining */
234 NULL, /* hosts_avoid_esmtp */
236 NULL, /* hosts_nopass_tls */
237 US"*", /* hosts_noproxy_tls */
239 5*60, /* command_timeout */
240 5*60, /* connect_timeout; shorter system default overrides */
241 5*60, /* data timeout */
242 10*60, /* final timeout */
243 1024, /* size_addition */
244 5, /* hosts_max_try */
245 50, /* hosts_max_try_hardlimit */
246 TRUE, /* address_retry_include_sender */
247 FALSE, /* allow_localhost */
248 FALSE, /* authenticated_sender_force */
249 FALSE, /* gethostbyname */
250 TRUE, /* dns_qualify_single */
251 FALSE, /* dns_search_parents */
252 { NULL, NULL }, /* dnssec_domains {request,require} */
253 TRUE, /* delay_after_cutoff */
254 FALSE, /* hosts_override */
255 FALSE, /* hosts_randomize */
256 TRUE, /* keepalive */
257 FALSE, /* lmtp_ignore_quota */
258 NULL, /* expand_retry_include_ip_address */
259 TRUE /* retry_include_ip_address */
261 ,NULL /* socks_proxy */
264 ,NULL, /* tls_certificate */
266 NULL, /* tls_privatekey */
267 NULL, /* tls_require_ciphers */
269 US"system", /* tls_verify_certificates */
270 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
271 /* tls_dh_min_bits */
272 TRUE, /* tls_tempfail_tryclear */
273 NULL, /* tls_verify_hosts */
274 US"*", /* tls_try_verify_hosts */
275 US"*" /* tls_verify_cert_hostnames */
278 , {NULL, /* dkim_canon */
279 NULL, /* dkim_domain */
280 NULL, /* dkim_private_key */
281 NULL, /* dkim_selector */
282 NULL, /* dkim_sign_headers */
283 NULL, /* dkim_strict */
284 FALSE} /* dot_stuffed */
288 /* some DSN flags for use later */
290 static int rf_list[] = {rf_notify_never, rf_notify_success,
291 rf_notify_failure, rf_notify_delay };
293 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
299 static uschar *smtp_command; /* Points to last cmd for error messages */
300 static uschar *mail_command; /* Points to MAIL cmd for error messages */
301 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
302 static BOOL update_waiting; /* TRUE to update the "wait" database */
304 /*XXX move to smtp_context */
305 static BOOL pipelining_active; /* current transaction is in pipe mode */
308 /*************************************************
309 * Setup entry point *
310 *************************************************/
312 /* This function is called when the transport is about to be used,
313 but before running it in a sub-process. It is used for two things:
315 (1) To set the fallback host list in addresses, when delivering.
316 (2) To pass back the interface, port, protocol, and other options, for use
317 during callout verification.
320 tblock pointer to the transport instance block
321 addrlist list of addresses about to be transported
322 tf if not NULL, pointer to block in which to return options
323 uid the uid that will be set (not used)
324 gid the gid that will be set (not used)
325 errmsg place for error message (not used)
327 Returns: OK always (FAIL, DEFER not used)
331 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
332 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
334 smtp_transport_options_block *ob =
335 (smtp_transport_options_block *)(tblock->options_block);
337 errmsg = errmsg; /* Keep picky compilers happy */
341 /* Pass back options if required. This interface is getting very messy. */
345 tf->interface = ob->interface;
347 tf->protocol = ob->protocol;
348 tf->hosts = ob->hosts;
349 tf->hosts_override = ob->hosts_override;
350 tf->hosts_randomize = ob->hosts_randomize;
351 tf->gethostbyname = ob->gethostbyname;
352 tf->qualify_single = ob->dns_qualify_single;
353 tf->search_parents = ob->dns_search_parents;
354 tf->helo_data = ob->helo_data;
357 /* Set the fallback host list for all the addresses that don't have fallback
358 host lists, provided that the local host wasn't present in the original host
361 if (!testflag(addrlist, af_local_host_removed))
362 for (; addrlist; addrlist = addrlist->next)
363 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
370 /*************************************************
371 * Initialization entry point *
372 *************************************************/
374 /* Called for each instance, after its options have been read, to
375 enable consistency checks to be done, or anything else that needs
378 Argument: pointer to the transport instance block
383 smtp_transport_init(transport_instance *tblock)
385 smtp_transport_options_block *ob =
386 (smtp_transport_options_block *)(tblock->options_block);
388 /* Retry_use_local_part defaults FALSE if unset */
390 if (tblock->retry_use_local_part == TRUE_UNSET)
391 tblock->retry_use_local_part = FALSE;
393 /* Set the default port according to the protocol */
395 if (ob->port == NULL)
396 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
397 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
399 /* Set up the setup entry point, to be called before subprocesses for this
402 tblock->setup = smtp_transport_setup;
404 /* Complain if any of the timeouts are zero. */
406 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
407 ob->final_timeout <= 0)
408 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
409 "command, data, or final timeout value is zero for %s transport",
412 /* If hosts_override is set and there are local hosts, set the global
413 flag that stops verify from showing router hosts. */
415 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
417 /* If there are any fallback hosts listed, build a chain of host items
418 for them, but do not do any lookups at this time. */
420 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
427 /*************************************************
428 * Set delivery info into all active addresses *
429 *************************************************/
431 /* Only addresses whose status is >= PENDING are relevant. A lesser
432 status means that an address is not currently being processed.
435 addrlist points to a chain of addresses
436 errno_value to put in each address's errno field
437 msg to put in each address's message field
438 rc to put in each address's transport_return field
439 pass_message if TRUE, set the "pass message" flag in the address
440 host if set, mark addrs as having used this host
441 smtp_greeting from peer
442 helo_response from peer
444 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446 this particular type of timeout.
452 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
453 BOOL pass_message, host_item * host
454 #ifdef EXPERIMENTAL_DSN_INFO
455 , const uschar * smtp_greeting, const uschar * helo_response
461 if (errno_value == ERRNO_CONNECTTIMEOUT)
463 errno_value = ETIMEDOUT;
464 orvalue = RTEF_CTOUT;
466 for (addr = addrlist; addr; addr = addr->next)
467 if (addr->transport_return >= PENDING)
469 addr->basic_errno = errno_value;
470 addr->more_errno |= orvalue;
474 if (pass_message) setflag(addr, af_pass_message);
476 addr->transport_return = rc;
479 addr->host_used = host;
480 #ifdef EXPERIMENTAL_DSN_INFO
482 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
483 addr->smtp_greeting = smtp_greeting;
486 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
487 addr->helo_response = helo_response;
494 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
498 #ifdef EXPERIMENTAL_DSN_INFO
505 /*************************************************
506 * Check an SMTP response *
507 *************************************************/
509 /* This function is given an errno code and the SMTP response buffer
510 to analyse, together with the host identification for generating messages. It
511 sets an appropriate message and puts the first digit of the response code into
512 the yield variable. If no response was actually read, a suitable digit is
516 host the current host, to get its name for messages
517 errno_value pointer to the errno value
518 more_errno from the top address for use with ERRNO_FILTER_FAIL
519 buffer the SMTP response buffer
520 yield where to put a one-digit SMTP response code
521 message where to put an error message
522 pass_message set TRUE if message is an SMTP response
524 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
528 check_response(host_item *host, int *errno_value, int more_errno,
529 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
531 uschar * pl = pipelining_active ? US"pipelined " : US"";
534 *yield = '4'; /* Default setting is to give a temporary error */
538 case ETIMEDOUT: /* Handle response timeout */
539 *message = US string_sprintf("SMTP timeout after %s%s",
541 if (transport_count > 0)
542 *message = US string_sprintf("%s (%d bytes written)", *message,
546 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
547 s = string_printing(buffer);
548 while (isspace(*s)) s++;
550 ? string_sprintf("Malformed SMTP reply (an empty line) "
551 "in response to %s%s", pl, smtp_command)
552 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
553 pl, smtp_command, s);
556 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
557 can't send QUIT as we mustn't end the DATA. */
558 *message = string_sprintf("transport filter process failed (%d)%s",
560 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
563 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
564 can't send QUIT as we mustn't end the DATA. */
566 string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
570 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
571 *message = string_sprintf("failed to write a data block");
575 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 /* Handle error responses from the remote mailer. */
586 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
587 "%s", pl, smtp_command, s = string_printing(buffer));
588 *pass_message = TRUE;
593 /* No data was read. If there is no errno, this must be the EOF (i.e.
594 connection closed) case, which causes deferral. An explicit connection reset
595 error has the same effect. Otherwise, put the host's identity in the message,
596 leaving the errno value to be interpreted as well. In all cases, we have to
597 assume the connection is now dead. */
599 if (*errno_value == 0 || *errno_value == ECONNRESET)
601 *errno_value = ERRNO_SMTPCLOSED;
602 *message = US string_sprintf("Remote host closed connection "
603 "in response to %s%s", pl, smtp_command);
606 *message = US string_sprintf("%s [%s]", host->name, host->address);
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
617 /* This writes to the main log and to the message log.
620 addr the address item containing error information
621 host the current host
627 write_logs(address_item *addr, host_item *host)
629 uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
636 message = string_sprintf("%s: %s", message, addr->message);
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
651 msglog_line(host_item * host, uschar * message)
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
659 #ifndef DISABLE_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
668 addr the address item containing error information
669 host the current host
675 deferred_event_raise(address_item *addr, host_item *host)
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
697 (void) event_raise(action, US"msg:host:defer",
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
738 sx smtp connection context
739 count the number of responses to read
740 pending_DATA 0 if last command sent was not DATA
741 +1 if previously had a good recipient
742 -1 if not previously had a good recipient
744 Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
754 sync_responses(smtp_context * sx, int count, int pending_DATA)
756 address_item *addr = sx->sync_addr;
757 smtp_transport_options_block *ob =
758 (smtp_transport_options_block *)sx->tblock->options_block;
761 /* Handle the response for a MAIL command. On error, reinstate the original
762 command in big_buffer for error message use, and flush any further pending
763 responses before returning, except after I/O errors and timeouts. */
765 if (sx->pending_MAIL)
768 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
769 '2', ob->command_timeout))
771 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
772 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
773 if (errno == 0 && sx->buffer[0] != 0)
775 uschar flushbuffer[4096];
777 if (sx->buffer[0] == '4')
779 save_errno = ERRNO_MAIL4XX;
780 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
784 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
785 '2', ob->command_timeout)
786 && (errno != 0 || flushbuffer[0] == 0))
792 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 while (count-- > 0) /* Mark any pending addrs with the host used */
795 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
796 addr->host_used = sx->host;
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
805 /* Read and handle the required number of RCPT responses, matching each one up
806 with an address by scanning for the next address whose status is PENDING_DEFER.
811 while (addr->transport_return != PENDING_DEFER)
812 if (!(addr = addr->next))
815 /* The address was accepted */
816 addr->host_used = sx->host;
818 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
819 '2', ob->command_timeout))
822 addr->transport_return = PENDING_OK;
824 /* If af_dr_retry_exists is set, there was a routing delay on this address;
825 ensure that any address-specific retry record is expunged. We do this both
826 for the basic key and for the version that also includes the sender. */
828 if (testflag(addr, af_dr_retry_exists))
830 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
832 retry_add_item(addr, altkey, rf_delete);
833 retry_add_item(addr, addr->address_retry_key, rf_delete);
837 /* Timeout while reading the response */
839 else if (errno == ETIMEDOUT)
841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
842 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
843 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
844 retry_add_item(addr, addr->address_retry_key, 0);
845 update_waiting = FALSE;
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
854 else if (errno != 0 || sx->buffer[0] == 0)
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
861 /* Handle SMTP permanent and temporary response codes. */
866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
867 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
868 string_printing(sx->buffer));
869 setflag(addr, af_pass_message);
871 msglog_line(sx->host, addr->message);
873 /* The response was 5xx */
875 if (sx->buffer[0] == '5')
877 addr->transport_return = FAIL;
881 /* The response was 4xx */
885 addr->transport_return = DEFER;
886 addr->basic_errno = ERRNO_RCPT4XX;
887 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
891 #ifndef DISABLE_EVENT
892 event_defer_errno = addr->more_errno;
893 msg_event_raise(US"msg:rcpt:host:defer", addr);
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
901 sx->host->name, sx->host->address, addr->message);
903 #ifndef DISABLE_EVENT
905 msg_event_raise(US"msg:rcpt:defer", addr);
908 /* Do not put this message on the list of those waiting for specific
909 hosts, as otherwise it is likely to be tried too often. */
911 update_waiting = FALSE;
913 /* Add a retry item for the address so that it doesn't get tried again
914 too soon. If address_retry_include_sender is true, add the sender address
918 ob->address_retry_include_sender
919 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
920 : addr->address_retry_key,
925 } /* Loop for next RCPT response */
927 /* Update where to start at for the next block of responses, unless we
928 have already handled all the addresses. */
930 if (addr) sx->sync_addr = addr->next;
932 /* Handle a response to DATA. If we have not had any good recipients, either
933 previously or in this block, the response is ignored. */
935 if (pending_DATA != 0 &&
936 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
937 '3', ob->command_timeout))
942 if (pending_DATA > 0 || (yield & 1) != 0)
944 if (errno == 0 && sx->buffer[0] == '4')
946 errno = ERRNO_DATA4XX;
947 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
951 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
952 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
953 "is in use and there were no good recipients\n", msg);
956 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
957 present) received 3xx. If any RCPTs were handled and yielded anything other
958 than 4xx, yield will be set non-zero. */
965 /* Do the client side of smtp-level authentication */
968 buffer EHLO response from server (gets overwritten)
969 addrlist chain of potential addresses to deliver
970 host host to deliver to
972 ibp, obp comms channel control blocks
975 OK Success, or failed (but not required): global "smtp_authenticated" set
976 DEFER Failed authentication (and was required)
977 ERROR Internal problem
979 FAIL_SEND Failed communications - transmit
984 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
985 smtp_transport_options_block *ob, BOOL is_esmtp,
986 smtp_inblock *ibp, smtp_outblock *obp)
989 uschar *fail_reason = US"server did not advertise AUTH support";
991 smtp_authenticated = FALSE;
992 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
993 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
995 if (is_esmtp && !regex_AUTH) regex_AUTH =
996 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
999 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1001 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1002 expand_nmax = -1; /* reset */
1004 /* Must not do this check until after we have saved the result of the
1005 regex match above. */
1007 if (require_auth == OK ||
1008 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1011 fail_reason = US"no common mechanisms were found";
1013 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1015 /* Scan the configured authenticators looking for one which is configured
1016 for use as a client, which is not suppressed by client_condition, and
1017 whose name matches an authentication mechanism supported by the server.
1018 If one is found, attempt to authenticate by calling its client function.
1021 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1025 (au->client_condition != NULL &&
1026 !expand_check_condition(au->client_condition, au->name,
1027 US"client authenticator")))
1029 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1031 (au->client)? "client_condition is false" :
1032 "not configured as a client");
1036 /* Loop to scan supported server mechanisms */
1041 int len = Ustrlen(au->public_name);
1042 while (isspace(*p)) p++;
1044 if (strncmpic(au->public_name, p, len) != 0 ||
1045 (p[len] != 0 && !isspace(p[len])))
1047 while (*p != 0 && !isspace(*p)) p++;
1051 /* Found data for a listed mechanism. Call its client entry. Set
1052 a flag in the outblock so that data is overwritten after sending so
1053 that reflections don't show it. */
1055 fail_reason = US"authentication attempt(s) failed";
1056 obp->authenticating = TRUE;
1057 rc = (au->info->clientcode)(au, ibp, obp,
1058 ob->command_timeout, buffer, bufsize);
1059 obp->authenticating = FALSE;
1060 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1063 /* A temporary authentication failure must hold up delivery to
1064 this host. After a permanent authentication failure, we carry on
1065 to try other authentication methods. If all fail hard, try to
1066 deliver the message unauthenticated unless require_auth was set. */
1071 smtp_authenticated = TRUE; /* stops the outer loop */
1072 client_authenticator = au->name;
1073 if (au->set_client_id != NULL)
1074 client_authenticated_id = expand_string(au->set_client_id);
1077 /* Failure after writing a command */
1082 /* Failure after reading a response */
1085 if (errno != 0 || buffer[0] != '5') return FAIL;
1086 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1087 au->name, host->name, host->address, buffer);
1090 /* Failure by some other means. In effect, the authenticator
1091 decided it wasn't prepared to handle this case. Typically this
1092 is the result of "fail" in an expansion string. Do we need to
1093 log anything here? Feb 2006: a message is now put in the buffer
1094 if logging is required. */
1098 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1099 "authentication H=%s [%s] %s", au->name, host->name,
1100 host->address, buffer);
1103 /* Internal problem, message in buffer. */
1106 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1111 break; /* If not authenticated, try next authenticator */
1112 } /* Loop for scanning supported server mechanisms */
1113 } /* Loop for further authenticators */
1117 /* If we haven't authenticated, but are required to, give up. */
1119 if (require_auth == OK && !smtp_authenticated)
1121 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1122 string_sprintf("authentication required but %s", fail_reason), DEFER,
1131 /* Construct AUTH appendix string for MAIL TO */
1134 buffer to build string
1135 addrlist chain of potential addresses to deliver
1136 ob transport options
1138 Globals smtp_authenticated
1139 client_authenticated_sender
1140 Return True on error, otherwise buffer has (possibly empty) terminated string
1144 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1145 smtp_transport_options_block *ob)
1147 uschar *local_authenticated_sender = authenticated_sender;
1150 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1153 if (ob->authenticated_sender != NULL)
1155 uschar *new = expand_string(ob->authenticated_sender);
1158 if (!expand_string_forcedfail)
1160 uschar *message = string_sprintf("failed to expand "
1161 "authenticated_sender: %s", expand_string_message);
1162 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1166 else if (new[0] != 0) local_authenticated_sender = new;
1169 /* Add the authenticated sender address if present */
1171 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1172 local_authenticated_sender != NULL)
1174 string_format(buffer, bufsize, " AUTH=%s",
1175 auth_xtextencode(local_authenticated_sender,
1176 Ustrlen(local_authenticated_sender)));
1177 client_authenticated_sender = string_copy(local_authenticated_sender);
1187 #ifdef EXPERIMENTAL_DANE
1188 /* Lookup TLSA record for host/port.
1189 Return: OK success with dnssec; DANE mode
1190 DEFER Do not use this host now, may retry later
1191 FAIL_FORCED No TLSA record; DANE not usable
1192 FAIL Do not use this connection
1196 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1198 /* move this out to host.c given the similarity to dns_lookup() ? */
1200 const uschar * fullname = buffer;
1204 /* TLSA lookup string */
1205 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1207 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1208 sec = dns_is_secure(dnsa);
1210 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1220 return DEFER; /* just defer this TLS'd conn */
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
1224 return dane_required ? FAIL : FAIL_FORCED;
1228 return dane_required ? FAIL : DEFER;
1235 typedef struct smtp_compare_s
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1242 /* Create a unique string that identifies this message, it is based on
1243 sender_address, helo_data and tls_certificate if enabled.
1247 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249 address_item * addr1;
1250 uschar * if1 = US"";
1251 uschar * helo1 = US"";
1253 uschar * tlsc1 = US"";
1255 uschar * save_sender_address = sender_address;
1256 uschar * local_identity = NULL;
1257 smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1260 sender_address = sender;
1262 addr1 = deliver_make_addr (sender, TRUE);
1263 deliver_set_expansions(addr1);
1266 if1 = expand_string(ob->interface);
1269 helo1 = expand_string(ob->helo_data);
1272 if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276 local_identity = string_sprintf ("%s^%s", if1, helo1);
1279 deliver_set_expansions(NULL);
1280 sender_address = save_sender_address;
1282 return local_identity;
1287 /* This routine is a callback that is called from transport_check_waiting.
1288 This function will evaluate the incoming message versus the previous
1289 message. If the incoming message is using a different local identity then
1290 we will veto this new message. */
1293 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295 uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1299 current_local_identity =
1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1302 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1305 message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
1308 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1314 ehlo_response(uschar * buf, uschar checks)
1316 size_t bsize = Ustrlen(buf);
1319 if ( checks & OPTION_TLS
1320 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1321 checks &= ~OPTION_TLS;
1324 if ( checks & OPTION_IGNQ
1325 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~OPTION_IGNQ;
1329 if ( checks & OPTION_CHUNKING
1330 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~OPTION_CHUNKING;
1333 #ifndef DISABLE_PRDR
1334 if ( checks & OPTION_PRDR
1335 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~OPTION_PRDR;
1340 if ( checks & OPTION_UTF8
1341 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~OPTION_UTF8;
1345 if ( checks & OPTION_DSN
1346 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~OPTION_DSN;
1349 if ( checks & OPTION_PIPE
1350 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1351 PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~OPTION_PIPE;
1354 if ( checks & OPTION_SIZE
1355 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~OPTION_SIZE;
1363 /* Callback for emitting a BDAT data chunk header.
1365 If given a nonzero size, first flush any buffered SMTP commands
1366 then emit the command.
1368 Reap previous SMTP command responses if requested, and always reap
1369 the response from a previous BDAT command.
1372 tctx transport context
1373 chunk_size value for SMTP BDAT command
1375 tc_chunk_last add LAST option to SMTP BDAT command
1376 tc_reap_prev reap response to previous SMTP commands
1378 Returns: OK or ERROR
1382 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1385 smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 smtp_context * sx = tctx->smtp_context;
1391 /* Write SMTP chunk header command. If not reaping responses, note that
1392 there may be more writes (like, the chunk data) done soon. */
1396 if((cmd_count = smtp_write_command(&sx->outblock,
1397 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1398 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1399 ) < 0) return ERROR;
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1404 prev_cmd_count = cmd_count += sx->cmd_count;
1406 /* Reap responses for any previous, but not one we just emitted */
1410 if (sx->pending_BDAT)
1413 if (flags & tc_reap_prev && prev_cmd_count > 0)
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
1418 switch(sync_responses(sx, prev_cmd_count, 0))
1420 case 1: /* 2xx (only) => OK */
1421 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1429 if (!sx->pending_BDAT)
1430 pipelining_active = FALSE;
1433 /* Reap response for an outstanding BDAT */
1435 if (sx->pending_BDAT)
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1439 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1440 ob->command_timeout))
1442 if (errno == 0 && sx->buffer[0] == '4')
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1445 sx->addrlist->more_errno |=
1446 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1451 sx->pending_BDAT = FALSE;
1452 pipelining_active = FALSE;
1454 else if (chunk_size > 0)
1455 sx->pending_BDAT = TRUE;
1458 sx->cmd_count = cmd_count;
1464 /*************************************************
1465 * Make connection for given message *
1466 *************************************************/
1470 ctx connection context
1471 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1472 a second attempt after TLS initialization fails
1474 Returns: OK - the connection was made and the delivery attempted;
1475 fd is set in the conn context, tls_out set up.
1476 DEFER - the connection could not be made, or something failed
1477 while setting up the SMTP session, or there was a
1478 non-message-specific error, such as a timeout.
1479 ERROR - helo_data or add_headers or authenticated_sender is
1480 specified for this transport, and the string failed
1484 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1486 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1487 dns_answer tlsa_dnsa;
1489 BOOL pass_message = FALSE;
1490 uschar * message = NULL;
1494 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1496 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1497 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1499 sx->send_rset = TRUE;
1500 sx->send_quit = TRUE;
1501 sx->setting_up = TRUE;
1503 sx->esmtp_sent = FALSE;
1505 sx->utf8_needed = FALSE;
1507 sx->dsn_all_lasthop = TRUE;
1508 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1510 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1513 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1514 sx->peer_offered = 0;
1515 sx->avoid_option = 0;
1516 sx->igquotstr = US"";
1517 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1518 #ifdef EXPERIMENTAL_DSN_INFO
1519 sx->smtp_greeting = NULL;
1520 sx->helo_response = NULL;
1523 smtp_command = US"initial connection";
1524 sx->buffer[0] = '\0';
1526 /* Set up the buffer for reading SMTP response packets. */
1528 sx->inblock.buffer = sx->inbuffer;
1529 sx->inblock.buffersize = sizeof(sx->inbuffer);
1530 sx->inblock.ptr = sx->inbuffer;
1531 sx->inblock.ptrend = sx->inbuffer;
1533 /* Set up the buffer for holding SMTP commands while pipelining */
1535 sx->outblock.buffer = sx->outbuffer;
1536 sx->outblock.buffersize = sizeof(sx->outbuffer);
1537 sx->outblock.ptr = sx->outbuffer;
1538 sx->outblock.cmd_count = 0;
1539 sx->outblock.authenticating = FALSE;
1541 /* Reset the parameters of a TLS session. */
1544 tls_out.cipher = NULL; /* the one we may use for this transport */
1545 tls_out.ourcert = NULL;
1546 tls_out.peercert = NULL;
1547 tls_out.peerdn = NULL;
1548 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1551 tls_out.ocsp = OCSP_NOT_REQ;
1553 /* Flip the legacy TLS-related variables over to the outbound set in case
1554 they're used in the context of the transport. Don't bother resetting
1555 afterward (when being used by a transport) as we're in a subprocess.
1556 For verify, unflipped once the callout is dealt with */
1558 tls_modify_variables(&tls_out);
1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1569 /* Make a connection to the host if this isn't a continued delivery, and handle
1570 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571 specially so they can be identified for retries. */
1573 if (!continue_hostname)
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1578 /* Get the actual port the connection will use, into sx->host */
1580 smtp_port_for_connect(sx->host, sx->port);
1582 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1583 /* Do TLSA lookup for DANE */
1585 tls_out.dane_verified = FALSE;
1586 tls_out.tlsa_usage = 0;
1588 if (sx->host->dnssec == DS_YES)
1590 if( sx->dane_required
1591 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1593 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1595 case OK: sx->dane = TRUE;
1596 sx->ob->tls_tempfail_tryclear = FALSE;
1598 case FAIL_FORCED: break;
1599 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1600 string_sprintf("DANE error: tlsa lookup %s",
1601 rc == DEFER ? "DEFER" : "FAIL"),
1606 else if (sx->dane_required)
1608 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1609 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1616 /* Make the TCP connection */
1618 sx->inblock.sock = sx->outblock.sock =
1619 smtp_connect(sx->host, sx->host_af, sx->interface,
1620 sx->ob->connect_timeout, sx->tblock);
1622 if (sx->inblock.sock < 0)
1624 uschar * msg = NULL;
1627 msg = US strerror(errno);
1628 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1630 set_errno_nohost(sx->addrlist,
1631 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1632 sx->verify ? string_sprintf("could not connect: %s", msg)
1635 sx->send_quit = FALSE;
1639 /* Expand the greeting message while waiting for the initial response. (Makes
1640 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1641 delayed till here so that $sending_interface and $sending_port are set. */
1644 if (!(sx->helo_data = expand_string(sx->helo_data)))
1646 log_write(0, LOG_MAIN|LOG_PANIC,
1647 "<%s>: failed to expand transport's helo_data value for callout: %s",
1648 sx->addrlist->address, expand_string_message);
1653 expand_string_message = NULL;
1654 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1655 &expand_string_message)),
1656 expand_string_message)
1658 log_write(0, LOG_MAIN|LOG_PANIC,
1659 "<%s>: failed to expand transport's helo_data value for callout: %s",
1660 sx->addrlist->address, expand_string_message);
1662 sx->helo_data = NULL;
1666 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1667 is nevertheless a reasonably clean way of programming this kind of logic,
1668 where you want to escape on any error. */
1675 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1677 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1678 '2', sx->ob->command_timeout);
1679 #ifdef EXPERIMENTAL_DSN_INFO
1680 sx->smtp_greeting = string_copy(sx->buffer);
1682 if (!good_response) goto RESPONSE_FAILED;
1684 #ifndef DISABLE_EVENT
1687 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1688 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1689 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1692 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1693 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1701 /* Now check if the helo_data expansion went well, and sign off cleanly if
1706 message = string_sprintf("failed to expand helo_data: %s",
1707 expand_string_message);
1708 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1714 /** Debugging without sending a message
1715 sx->addrlist->transport_return = DEFER;
1719 /* Errors that occur after this point follow an SMTP command, which is
1720 left in big_buffer by smtp_write_command() for use in error messages. */
1722 smtp_command = big_buffer;
1724 /* Tell the remote who we are...
1726 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1727 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1728 greeting is of this form. The assumption was that the far end supports it
1729 properly... but experience shows that there are some that give 5xx responses,
1730 even though the banner includes "ESMTP" (there's a bloody-minded one that
1731 says "ESMTP not spoken here"). Cope with that case.
1733 September 2000: Time has passed, and it seems reasonable now to always send
1734 EHLO at the start. It is also convenient to make the change while installing
1737 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1738 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1739 would be no way to send out the mails, so there is now a host list
1740 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1741 PIPELINING problem as well. Maybe it can also be useful to cure other
1742 problems with broken servers.
1744 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1745 Then somebody tried it with a Microsoft mailer... It seems that all other
1746 mailers use upper case for some reason (the RFC is quite clear about case
1747 independence) so, for peace of mind, I gave in. */
1749 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1751 /* Alas; be careful, since this goto is not an error-out, so conceivably
1752 we might set data between here and the target which we assume to exist
1753 and be usable. I can see this coming back to bite us. */
1757 smtp_peer_options |= OPTION_TLS;
1758 suppress_tls = FALSE;
1759 sx->ob->tls_tempfail_tryclear = FALSE;
1760 smtp_command = US"SSL-on-connect";
1767 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1768 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1770 sx->esmtp_sent = TRUE;
1771 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1772 sx->ob->command_timeout))
1774 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1776 #ifdef EXPERIMENTAL_DSN_INFO
1777 sx->helo_response = string_copy(sx->buffer);
1779 goto RESPONSE_FAILED;
1783 #ifdef EXPERIMENTAL_DSN_INFO
1784 sx->helo_response = string_copy(sx->buffer);
1789 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1794 int n = sizeof(sx->buffer);
1795 uschar * rsp = sx->buffer;
1797 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1798 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1800 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1802 good_response = smtp_read_response(&sx->inblock, rsp, n,
1803 '2', sx->ob->command_timeout);
1804 #ifdef EXPERIMENTAL_DSN_INFO
1805 sx->helo_response = string_copy(rsp);
1809 /* Handle special logging for a closed connection after HELO
1810 when had previously sent EHLO */
1812 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1814 errno = ERRNO_SMTPCLOSED;
1815 goto EHLOHELO_FAILED;
1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1818 goto RESPONSE_FAILED;
1822 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1824 if (sx->esmtp || sx->lmtp)
1826 sx->peer_offered = ehlo_response(sx->buffer,
1827 OPTION_TLS /* others checked later */
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1833 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1838 /* For continuing deliveries down the same channel, having re-exec'd the socket
1839 is the standard input; for a socket held open from verify it is recorded
1840 in the cutthrough context block. Either way we don't need to redo EHLO here
1841 (but may need to do so for TLS - see below).
1842 Set up the pointer to where subsequent commands will be left, for
1843 error messages. Note that smtp_peer_options will have been
1844 set from the command line if they were set in the process that passed the
1847 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1848 as the continue goes via transport_pass_socket() and doublefork and exec.
1849 It does not wait. Unclear how we keep separate host's responses
1850 separate - we could match up by host ip+port as a bodge. */
1854 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1856 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1857 sx->host->port = sx->port = cutthrough.host.port;
1861 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1862 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1864 smtp_command = big_buffer;
1865 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1867 /* For a continued connection with TLS being proxied for us, or a
1868 held-open verify connection with TLS, nothing more to do. */
1870 if ( continue_proxy_cipher
1871 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1874 sx->peer_offered = smtp_peer_options;
1875 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1876 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1877 continue_proxy_cipher ? "proxied" : "verify conn with");
1880 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1883 /* If TLS is available on this connection, whether continued or not, attempt to
1884 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1885 send another EHLO - the server may give a different answer in secure mode. We
1886 use a separate buffer for reading the response to STARTTLS so that if it is
1887 negative, the original EHLO data is available for subsequent analysis, should
1888 the client not be required to use TLS. If the response is bad, copy the buffer
1889 for error analysis. */
1892 if ( smtp_peer_options & OPTION_TLS
1894 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1896 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1899 uschar buffer2[4096];
1900 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1903 /* If there is an I/O error, transmission of this message is deferred. If
1904 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1905 false, we also defer. However, if there is a temporary rejection of STARTTLS
1906 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1907 STARTTLS, we carry on. This means we will try to send the message in clear,
1908 unless the host is in hosts_require_tls (tested below). */
1910 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1911 sx->ob->command_timeout))
1915 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1918 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1919 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1920 goto RESPONSE_FAILED;
1924 /* STARTTLS accepted: try to negotiate a TLS session. */
1929 address_item * addr;
1931 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1932 # ifdef EXPERIMENTAL_DANE
1933 sx->dane ? &tlsa_dnsa : NULL,
1937 /* TLS negotiation failed; give an error. From outside, this function may
1938 be called again to try in clear on a new connection, if the options permit
1939 it for this host. */
1943 # ifdef EXPERIMENTAL_DANE
1944 if (sx->dane) log_write(0, LOG_MAIN,
1945 "DANE attempt failed; TLS connection to %s [%s]: %s",
1946 sx->host->name, sx->host->address, errstr);
1949 errno = ERRNO_TLSFAILURE;
1950 message = string_sprintf("TLS session: %s", errstr);
1951 sx->send_quit = FALSE;
1955 /* TLS session is set up */
1957 smtp_peer_options_wrap = smtp_peer_options;
1958 for (addr = sx->addrlist; addr; addr = addr->next)
1959 if (addr->transport_return == PENDING_DEFER)
1961 addr->cipher = tls_out.cipher;
1962 addr->ourcert = tls_out.ourcert;
1963 addr->peercert = tls_out.peercert;
1964 addr->peerdn = tls_out.peerdn;
1965 addr->ocsp = tls_out.ocsp;
1970 /* if smtps, we'll have smtp_command set to something else; always safe to
1972 smtp_command = big_buffer;
1974 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1975 helo_data is null, we are dealing with a connection that was passed from
1976 another process, and so we won't have expanded helo_data above. We have to
1977 expand it here. $sending_ip_address and $sending_port are set up right at the
1978 start of the Exim process (in exim.c). */
1980 if (tls_out.active >= 0)
1985 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1987 uschar *message = string_sprintf("failed to expand helo_data: %s",
1988 expand_string_message);
1989 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1994 /* For SMTPS we need to wait for the initial OK response. */
1997 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1998 '2', sx->ob->command_timeout);
1999 #ifdef EXPERIMENTAL_DSN_INFO
2000 sx->smtp_greeting = string_copy(sx->buffer);
2002 if (!good_response) goto RESPONSE_FAILED;
2006 greeting_cmd = "EHLO";
2009 greeting_cmd = "HELO";
2011 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2014 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2015 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2017 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2018 '2', sx->ob->command_timeout);
2019 #ifdef EXPERIMENTAL_DSN_INFO
2020 sx->helo_response = string_copy(sx->buffer);
2022 if (!good_response) goto RESPONSE_FAILED;
2023 smtp_peer_options = 0;
2026 /* If the host is required to use a secure channel, ensure that we
2030 # ifdef EXPERIMENTAL_DANE
2033 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2036 errno = ERRNO_TLSREQUIRED;
2037 message = string_sprintf("a TLS session is required, but %s",
2038 smtp_peer_options & OPTION_TLS
2039 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2042 #endif /*SUPPORT_TLS*/
2044 /* If TLS is active, we have just started it up and re-done the EHLO command,
2045 so its response needs to be analyzed. If TLS is not active and this is a
2046 continued session down a previously-used socket, we haven't just done EHLO, so
2049 if (continue_hostname == NULL
2051 || tls_out.active >= 0
2055 if (sx->esmtp || sx->lmtp)
2057 sx->peer_offered = ehlo_response(sx->buffer,
2059 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2063 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2064 /*XXX if we hand peercaps on to continued-conn processes,
2065 must not depend on this addr */
2069 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2072 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2073 lmtp_ignore_quota option was set. */
2075 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2077 /* If the response to EHLO specified support for the SIZE parameter, note
2078 this, provided size_addition is non-negative. */
2080 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2082 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2083 the current host, esmtp will be false, so PIPELINING can never be used. If
2084 the current host matches hosts_avoid_pipelining, don't do it. */
2086 if ( sx->peer_offered & OPTION_PIPE
2087 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2088 smtp_peer_options |= OPTION_PIPE;
2090 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2091 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2093 if ( sx->peer_offered & OPTION_CHUNKING
2094 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2095 sx->peer_offered &= ~OPTION_CHUNKING;
2097 if (sx->peer_offered & OPTION_CHUNKING)
2098 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2100 #ifndef DISABLE_PRDR
2101 if ( sx->peer_offered & OPTION_PRDR
2102 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2103 sx->peer_offered &= ~OPTION_PRDR;
2105 if (sx->peer_offered & OPTION_PRDR)
2106 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2109 /* Note if the server supports DSN */
2110 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2111 DEBUG(D_transport) debug_printf("%susing DSN\n",
2112 sx->peer_offered & OPTION_DSN ? "" : "not ");
2114 /* Note if the response to EHLO specifies support for the AUTH extension.
2115 If it has, check that this host is one we want to authenticate to, and do
2116 the business. The host name and address must be available when the
2117 authenticator's client driver is running. */
2119 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2120 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2122 default: goto SEND_QUIT;
2124 case FAIL_SEND: goto SEND_FAILED;
2125 case FAIL: goto RESPONSE_FAILED;
2129 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2131 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2132 message-specific. */
2134 sx->setting_up = FALSE;
2137 if (sx->addrlist->prop.utf8_msg)
2139 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2140 && !sx->addrlist->prop.utf8_downcvt_maybe;
2141 DEBUG(D_transport) if (!sx->utf8_needed)
2142 debug_printf("utf8: %s downconvert\n",
2143 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2146 /* If this is an international message we need the host to speak SMTPUTF8 */
2147 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2149 errno = ERRNO_UTF8_FWD;
2150 goto RESPONSE_FAILED;
2162 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2163 sx->buffer, &code, &message, &pass_message);
2168 message = US string_sprintf("send() to %s [%s] failed: %s",
2169 sx->host->name, sx->host->address, strerror(errno));
2170 sx->send_quit = FALSE;
2173 /* This label is jumped to directly when a TLS negotiation has failed,
2174 or was not done for a host for which it is required. Values will be set
2175 in message and errno, and setting_up will always be true. Treat as
2176 a temporary error. */
2180 message = string_sprintf("Remote host closed connection in response to %s"
2181 " (EHLO response was: %s)", smtp_command, sx->buffer);
2182 sx->send_quit = FALSE;
2191 /* The failure happened while setting up the call; see if the failure was
2192 a 5xx response (this will either be on connection, or following HELO - a 5xx
2193 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2194 fail all addresses, as this host is never going to accept them. For other
2195 errors during setting up (timeouts or whatever), defer all addresses, and
2196 yield DEFER, so that the host is not tried again for a while.
2198 XXX This peeking for another host feels like a layering violation. We want
2199 to note the host as unusable, but down here we shouldn't know if this was
2200 the last host to try for the addr(list). Perhaps the upper layer should be
2201 the one to do set_errno() ? The problem is that currently the addr is where
2202 errno etc. are stashed, but until we run out of hosts to try the errors are
2203 host-specific. Maybe we should enhance the host_item definition? */
2206 sx->ok = FALSE; /* For when reached by GOTO */
2207 set_errno(sx->addrlist, errno, message,
2212 || errno == ERRNO_UTF8_FWD
2215 pass_message, sx->host
2216 #ifdef EXPERIMENTAL_DSN_INFO
2217 , sx->smtp_greeting, sx->helo_response
2227 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2230 tls_close(FALSE, TRUE);
2233 /* Close the socket, and return the appropriate value, first setting
2234 works because the NULL setting is passed back to the calling process, and
2235 remote_max_parallel is forced to 1 when delivering over an existing connection,
2238 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2241 shutdown(sx->outblock.sock, SHUT_WR);
2242 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2243 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2244 rc--; /* drain socket */
2245 sx->send_quit = FALSE;
2247 (void)close(sx->inblock.sock);
2248 sx->inblock.sock = sx->outblock.sock = -1;
2250 #ifndef DISABLE_EVENT
2251 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2254 continue_transport = NULL;
2255 continue_hostname = NULL;
2262 /* Create the string of options that will be appended to the MAIL FROM:
2263 in the connection context buffer */
2266 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2268 uschar * p = sx->buffer;
2269 address_item * addr;
2274 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2275 send it, adding something to the message size to allow for imprecision
2276 and things that get added en route. Exim keeps the number of lines
2277 in a message, so we can give an accurate value for the original message, but we
2278 need some additional to handle added headers. (Double "." characters don't get
2279 included in the count.) */
2281 if ( message_size > 0
2282 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2284 /*XXX problem here under spool_files_wireformat?
2285 Or just forget about lines? Or inflate by a fixed proportion? */
2287 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2291 #ifndef DISABLE_PRDR
2292 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2295 sx->prdr_active = FALSE;
2296 if (sx->peer_offered & OPTION_PRDR)
2297 for (addr = addrlist; addr; addr = addr->next)
2298 if (addr->transport_return == PENDING_DEFER)
2300 for (addr = addr->next; addr; addr = addr->next)
2301 if (addr->transport_return == PENDING_DEFER)
2302 { /* at least two recipients to send */
2303 sx->prdr_active = TRUE;
2304 sprintf(CS p, " PRDR"); p += 5;
2312 /* If it supports internationalised messages, and this meesage need that,
2315 if ( sx->peer_offered & OPTION_UTF8
2316 && addrlist->prop.utf8_msg
2317 && !addrlist->prop.utf8_downcvt
2319 Ustrcpy(p, " SMTPUTF8"), p += 9;
2322 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2323 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2324 addr && address_count < sx->max_rcpt;
2325 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2328 if (!(addr->dsn_flags & rf_dsnlasthop))
2330 sx->dsn_all_lasthop = FALSE;
2335 /* Add any DSN flags to the mail command */
2337 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2339 if (dsn_ret == dsn_ret_hdrs)
2340 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2341 else if (dsn_ret == dsn_ret_full)
2342 { Ustrcpy(p, " RET=FULL"); p += 9; }
2346 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2351 /* If an authenticated_sender override has been specified for this transport
2352 instance, expand it. If the expansion is forced to fail, and there was already
2353 an authenticated_sender for this message, the original value will be used.
2354 Other expansion failures are serious. An empty result is ignored, but there is
2355 otherwise no check - this feature is expected to be used with LMTP and other
2356 cases where non-standard addresses (e.g. without domains) might be required. */
2358 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2366 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2368 uschar * p = sx->buffer;
2371 /* Add any DSN flags to the rcpt command */
2373 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2375 if (addr->dsn_flags & rf_dsnflags)
2380 Ustrcpy(p, " NOTIFY=");
2382 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2384 if (!first) *p++ = ',';
2386 Ustrcpy(p, rf_names[i]);
2391 if (addr->dsn_orcpt)
2393 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2404 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2405 -1 MAIL response error
2406 -2 any non-MAIL read i/o error
2407 -3 non-MAIL response timeout
2408 -4 internal error; channel still usable
2413 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2415 address_item * addr;
2419 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2425 /* From here until we send the DATA command, we can make use of PIPELINING
2426 if the server host supports it. The code has to be able to check the responses
2427 at any point, for when the buffer fills up, so we write it totally generally.
2428 When PIPELINING is off, each command written reports that it has flushed the
2431 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2434 uschar * s = sx->from_addr;
2436 uschar * errstr = NULL;
2438 /* If we must downconvert, do the from-address here. Remember we had to
2439 for the to-addresses (done below), and also (ugly) for re-doing when building
2440 the delivery log line. */
2442 if ( sx->addrlist->prop.utf8_msg
2443 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2446 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2448 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2452 setflag(sx->addrlist, af_utf8_downcvt);
2456 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2457 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2460 mail_command = string_copy(big_buffer); /* Save for later error message */
2464 case -1: /* Transmission error */
2467 case +1: /* Cmd was sent */
2468 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2469 sx->ob->command_timeout))
2471 if (errno == 0 && sx->buffer[0] == '4')
2473 errno = ERRNO_MAIL4XX;
2474 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2478 sx->pending_MAIL = FALSE;
2481 /* otherwise zero: command queued for pipeline */
2484 /* Pass over all the relevant recipient addresses for this host, which are the
2485 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2486 several before we have to read the responses for those seen so far. This
2487 checking is done by a subroutine because it also needs to be done at the end.
2488 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2489 the next one if not all are sent.
2491 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2492 last address because we want to abort if any recipients have any kind of
2493 problem, temporary or permanent. We know that all recipient addresses will have
2494 the PENDING_DEFER status, because only one attempt is ever made, and we know
2495 that max_rcpt will be large, so all addresses will be done at once.
2497 For verify we flush the pipeline after any (the only) rcpt address. */
2499 for (addr = sx->first_addr, address_count = 0;
2500 addr && address_count < sx->max_rcpt;
2501 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2507 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2508 ? dsn_support_yes : dsn_support_no;
2511 no_flush = pipelining_active && !sx->verify
2512 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2514 build_rcptcmd_options(sx, addr);
2516 /* Now send the RCPT command, and process outstanding responses when
2517 necessary. After a timeout on RCPT, we just end the function, leaving the
2518 yield as OK, because this error can often mean that there is a problem with
2519 just one address, so we don't want to delay the host. */
2521 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2524 if ( testflag(sx->addrlist, af_utf8_downcvt)
2525 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2528 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2529 errno = ERRNO_EXPANDFAIL;
2530 return -5; /*XXX too harsh? */
2534 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2535 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2537 if (count < 0) return -5;
2540 switch(sync_responses(sx, count, 0))
2542 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2543 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2546 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2547 if (!sx->lmtp) /* can't tell about progress yet */
2548 sx->completed_addr = TRUE;
2549 case 0: /* No 2xx or 5xx, but no probs */
2552 case -1: return -3; /* Timeout on RCPT */
2553 case -2: return -2; /* non-MAIL read i/o error */
2554 default: return -1; /* any MAIL error */
2556 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2558 } /* Loop for next address */
2560 sx->next_addr = addr;
2566 /*****************************************************
2567 * Proxy TLS connection for another transport process *
2568 ******************************************************/
2570 Use the given buffer as a staging area, and select on both the given fd
2571 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2572 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2576 buf space to use for buffering
2577 bufsiz size of buffer
2578 proxy_fd comms to proxied process
2579 timeout per-read timeout, seconds
2583 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2586 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2587 int rc, i, fd_bits, nbytes;
2589 set_process_info("proxying TLS connection for continued transport");
2591 FD_SET(tls_out.active, &rfds);
2592 FD_SET(proxy_fd, &rfds);
2594 for (fd_bits = 3; fd_bits; )
2596 time_t time_left = timeout;
2597 time_t time_start = time(NULL);
2603 struct timeval tv = { time_left, 0 };
2606 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2608 if (rc < 0 && errno == EINTR)
2609 if ((time_left -= time(NULL) - time_start) > 0) continue;
2613 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2617 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2619 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2620 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2624 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2626 /* handle inbound data */
2627 if (FD_ISSET(tls_out.active, &rfds))
2628 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2631 FD_CLR(tls_out.active, &rfds);
2632 shutdown(proxy_fd, SHUT_WR);
2637 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2638 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2640 else if (fd_bits & 1)
2641 FD_SET(tls_out.active, &rfds);
2643 /* handle outbound data */
2644 if (FD_ISSET(proxy_fd, &rfds))
2645 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2648 tls_close(FALSE, TRUE);
2652 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2653 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2656 else if (fd_bits & 2)
2657 FD_SET(proxy_fd, &rfds);
2663 /*************************************************
2664 * Deliver address list to given host *
2665 *************************************************/
2667 /* If continue_hostname is not null, we get here only when continuing to
2668 deliver down an existing channel. The channel was passed as the standard
2669 input. TLS is never active on a passed channel; the previous process always
2670 closes it down before passing the connection on.
2672 Otherwise, we have to make a connection to the remote host, and do the
2673 initial protocol exchange.
2675 When running as an MUA wrapper, if the sender or any recipient is rejected,
2676 temporarily or permanently, we force failure for all recipients.
2679 addrlist chain of potential addresses to deliver; only those whose
2680 transport_return field is set to PENDING_DEFER are currently
2681 being processed; others should be skipped - they have either
2682 been delivered to an earlier host or IP address, or been
2683 failed by one of them.
2684 host host to deliver to
2685 host_af AF_INET or AF_INET6
2686 defport default TCP/IP port to use if host does not specify, in host
2688 interface interface to bind to, or NULL
2689 tblock transport instance block
2690 message_defer set TRUE if yield is OK, but all addresses were deferred
2691 because of a non-recipient, non-host failure, that is, a
2692 4xx response to MAIL FROM, DATA, or ".". This is a defer
2693 that is specific to the message.
2694 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2695 a second attempt after TLS initialization fails
2697 Returns: OK - the connection was made and the delivery attempted;
2698 the result for each address is in its data block.
2699 DEFER - the connection could not be made, or something failed
2700 while setting up the SMTP session, or there was a
2701 non-message-specific error, such as a timeout.
2702 ERROR - a filter command is specified for this transport,
2703 and there was a problem setting it up; OR helo_data
2704 or add_headers or authenticated_sender is specified
2705 for this transport, and the string failed to expand
2709 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2710 uschar *interface, transport_instance *tblock,
2711 BOOL *message_defer, BOOL suppress_tls)
2717 struct timeval start_delivery_time;
2719 BOOL pass_message = FALSE;
2720 uschar *message = NULL;
2721 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2726 gettimeofday(&start_delivery_time, NULL);
2727 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2728 *message_defer = FALSE;
2730 sx.addrlist = addrlist;
2732 sx.host_af = host_af,
2734 sx.interface = interface;
2735 sx.helo_data = NULL;
2739 /* Get the channel set up ready for a message (MAIL FROM being the next
2740 SMTP command to send */
2742 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2745 /* If there is a filter command specified for this transport, we can now
2746 set it up. This cannot be done until the identify of the host is known. */
2748 if (tblock->filter_command)
2750 transport_filter_timeout = tblock->filter_timeout;
2752 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2755 if (!transport_set_up_command(&transport_filter_argv,
2756 tblock->filter_command, TRUE, DEFER, addrlist,
2757 string_sprintf("%.50s transport", tblock->name), NULL))
2759 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2765 if ( transport_filter_argv
2766 && *transport_filter_argv
2767 && **transport_filter_argv
2768 && sx.peer_offered & OPTION_CHUNKING
2771 sx.peer_offered &= ~OPTION_CHUNKING;
2772 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2776 sx.first_addr = addrlist;
2778 /* For messages that have more than the maximum number of envelope recipients,
2779 we want to send several transactions down the same SMTP connection. (See
2780 comments in deliver.c as to how this reconciles, heuristically, with
2781 remote_max_parallel.) This optimization was added to Exim after the following
2782 code was already working. The simplest way to put it in without disturbing the
2783 code was to use a goto to jump back to this point when there is another
2784 transaction to handle. */
2787 sx.from_addr = return_path;
2788 sx.sync_addr = sx.first_addr;
2790 sx.send_rset = TRUE;
2791 sx.completed_addr = FALSE;
2794 /* If we are a continued-connection-after-verify the MAIL and RCPT
2795 commands were already sent; do not re-send but do mark the addrs as
2796 having been accepted up to RCPT stage. A traditional cont-conn
2797 always has a sequence number greater than one. */
2799 if (continue_hostname && continue_sequence == 1)
2801 address_item * addr;
2803 sx.peer_offered = smtp_peer_options;
2804 sx.pending_MAIL = FALSE;
2806 sx.next_addr = NULL;
2808 for (addr = addrlist; addr; addr = addr->next)
2809 addr->transport_return = PENDING_OK;
2813 /* Initiate a message transfer. */
2815 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2818 case -1: case -2: goto RESPONSE_FAILED;
2819 case -3: goto END_OFF;
2820 case -4: goto SEND_QUIT;
2821 default: goto SEND_FAILED;
2824 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2825 permanently or temporarily. We should have flushed and synced after the last
2833 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2834 if (a->transport_return != PENDING_OK)
2836 /*XXX could we find a better errno than 0 here? */
2837 set_errno_nohost(addrlist, 0, a->message, FAIL,
2838 testflag(a, af_pass_message));
2845 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2846 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2847 have a good recipient buffered up if we are pipelining. We don't want to waste
2848 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2849 are pipelining. The responses are all handled by sync_responses().
2850 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2853 if ( !(sx.peer_offered & OPTION_CHUNKING)
2854 && (sx.ok || (pipelining_active && !mua_wrapper)))
2856 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2858 if (count < 0) goto SEND_FAILED;
2859 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2861 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2862 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2865 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2866 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2867 case 0: break; /* No 2xx or 5xx, but no probs */
2869 case -1: goto END_OFF; /* Timeout on RCPT */
2870 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2872 pipelining_active = FALSE;
2873 data_command = string_copy(big_buffer); /* Save for later error message */
2876 /* If there were no good recipients (but otherwise there have been no
2877 problems), just set ok TRUE, since we have handled address-specific errors
2878 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2879 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2880 well as body. Set the appropriate timeout value to be used for each chunk.
2881 (Haven't been able to make it work using select() for writing yet.) */
2883 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2885 /* Save the first address of the next batch. */
2886 sx.first_addr = sx.next_addr;
2892 transport_ctx tctx = {
2896 US".", US"..", /* Escaping strings */
2897 topt_use_crlf | topt_escape_headers
2898 | (tblock->body_only ? topt_no_headers : 0)
2899 | (tblock->headers_only ? topt_no_body : 0)
2900 | (tblock->return_path_add ? topt_add_return_path : 0)
2901 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2902 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2905 /* If using CHUNKING we need a callback from the generic transport
2906 support to us, for the sending of BDAT smtp commands and the reaping
2907 of responses. The callback needs a whole bunch of state so set up
2908 a transport-context structure to be passed around. */
2910 if (sx.peer_offered & OPTION_CHUNKING)
2912 tctx.check_string = tctx.escape_string = NULL;
2913 tctx.options |= topt_use_bdat;
2914 tctx.chunk_cb = smtp_chunk_cmd_callback;
2915 sx.pending_BDAT = FALSE;
2916 sx.good_RCPT = sx.ok;
2918 tctx.smtp_context = &sx;
2921 tctx.options |= topt_end_dot;
2923 /* Save the first address of the next batch. */
2924 sx.first_addr = sx.next_addr;
2926 /* Responses from CHUNKING commands go in buffer. Otherwise,
2927 there has not been a response. */
2931 sigalrm_seen = FALSE;
2932 transport_write_timeout = sx.ob->data_timeout;
2933 smtp_command = US"sending data block"; /* For error messages */
2934 DEBUG(D_transport|D_v)
2935 if (sx.peer_offered & OPTION_CHUNKING)
2936 debug_printf(" will write message using CHUNKING\n");
2938 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2939 transport_count = 0;
2941 #ifndef DISABLE_DKIM
2942 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2944 sx.ok = transport_write_message(&tctx, 0);
2947 /* transport_write_message() uses write() because it is called from other
2948 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2949 it can exit with "Broken pipe" as its error. This really means that the
2950 socket got closed at the far end. */
2952 transport_write_timeout = 0; /* for subsequent transports */
2954 /* Failure can either be some kind of I/O disaster (including timeout),
2955 or the failure of a transport filter or the expansion of added headers.
2956 Or, when CHUNKING, it can be a protocol-detected failure. */
2959 if (message) goto SEND_FAILED;
2960 else goto RESPONSE_FAILED;
2962 /* We used to send the terminating "." explicitly here, but because of
2963 buffering effects at both ends of TCP/IP connections, you don't gain
2964 anything by keeping it separate, so it might as well go in the final
2965 data buffer for efficiency. This is now done by setting the topt_end_dot
2968 smtp_command = US"end of data";
2970 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2972 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2973 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2975 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2976 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2979 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2980 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2981 case 0: break; /* No 2xx or 5xx, but no probs */
2983 case -1: goto END_OFF; /* Timeout on RCPT */
2984 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2988 #ifndef DISABLE_PRDR
2989 /* For PRDR we optionally get a partial-responses warning
2990 * followed by the individual responses, before going on with
2991 * the overall response. If we don't get the warning then deal
2992 * with per non-PRDR. */
2995 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2996 sx.ob->final_timeout);
2997 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2999 case '2': sx.prdr_active = FALSE;
3002 case '4': errno = ERRNO_DATA4XX;
3003 addrlist->more_errno |=
3004 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3011 /* For non-PRDR SMTP, we now read a single response that applies to the
3012 whole message. If it is OK, then all the addresses have been delivered. */
3016 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3017 sx.ob->final_timeout);
3018 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3020 errno = ERRNO_DATA4XX;
3021 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3025 /* For LMTP, we get back a response for every RCPT command that we sent;
3026 some may be accepted and some rejected. For those that get a response, their
3027 status is fixed; any that are accepted have been handed over, even if later
3028 responses crash - at least, that's how I read RFC 2033.
3030 If all went well, mark the recipient addresses as completed, record which
3031 host/IPaddress they were delivered to, and cut out RSET when sending another
3032 message down the same channel. Write the completed addresses to the journal
3033 now so that they are recorded in case there is a crash of hardware or
3034 software before the spool gets updated. Also record the final SMTP
3035 confirmation if needed (for SMTP only). */
3040 struct timeval delivery_time;
3042 uschar * conf = NULL;
3044 timesince(&delivery_time, &start_delivery_time);
3045 sx.send_rset = FALSE;
3046 pipelining_active = FALSE;
3048 /* Set up confirmation if needed - applies only to SMTP */
3051 #ifdef DISABLE_EVENT
3052 LOGGING(smtp_confirmation) &&
3057 const uschar *s = string_printing(sx.buffer);
3058 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3059 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3062 /* Process all transported addresses - for LMTP or PRDR, read a status for
3065 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3067 if (addr->transport_return != PENDING_OK) continue;
3069 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3070 remaining addresses. Otherwise, it's a return code for just the one
3071 address. For temporary errors, add a retry item for the address so that
3072 it doesn't get tried again too soon. */
3074 #ifndef DISABLE_PRDR
3075 if (sx.lmtp || sx.prdr_active)
3080 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3081 sx.ob->final_timeout))
3083 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3084 addr->message = string_sprintf(
3085 #ifndef DISABLE_PRDR
3086 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3088 "LMTP error after %s: %s",
3090 data_command, string_printing(sx.buffer));
3091 setflag(addr, af_pass_message); /* Allow message to go to user */
3092 if (sx.buffer[0] == '5')
3093 addr->transport_return = FAIL;
3096 errno = ERRNO_DATA4XX;
3097 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3098 addr->transport_return = DEFER;
3099 #ifndef DISABLE_PRDR
3100 if (!sx.prdr_active)
3102 retry_add_item(addr, addr->address_retry_key, 0);
3106 sx.completed_addr = TRUE; /* NOW we can set this flag */
3107 if (LOGGING(smtp_confirmation))
3109 const uschar *s = string_printing(sx.buffer);
3110 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3111 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3115 /* SMTP, or success return from LMTP for this address. Pass back the
3116 actual host that was used. */
3118 addr->transport_return = OK;
3119 addr->more_errno = delivery_time.tv_sec;
3120 addr->delivery_usec = delivery_time.tv_usec;
3121 addr->host_used = host;
3122 addr->special_action = flag;
3123 addr->message = conf;
3124 #ifndef DISABLE_PRDR
3125 if (sx.prdr_active) addr->flags |= af_prdr_used;
3127 if (sx.peer_offered & OPTION_CHUNKING) addr->flags |= af_chunking_used;
3130 #ifndef DISABLE_PRDR
3131 if (!sx.prdr_active)
3134 /* Update the journal. For homonymic addresses, use the base address plus
3135 the transport name. See lots of comments in deliver.c about the reasons
3136 for the complications when homonyms are involved. Just carry on after
3137 write error, as it may prove possible to update the spool file later. */
3139 if (testflag(addr, af_homonym))
3140 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3142 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3144 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3145 len = Ustrlen(CS sx.buffer);
3146 if (write(journal_fd, sx.buffer, len) != len)
3147 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3148 "%s: %s", sx.buffer, strerror(errno));
3152 #ifndef DISABLE_PRDR
3155 /* PRDR - get the final, overall response. For any non-success
3156 upgrade all the address statuses. */
3157 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3158 sx.ob->final_timeout);
3161 if(errno == 0 && sx.buffer[0] == '4')
3163 errno = ERRNO_DATA4XX;
3164 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3166 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3167 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3168 addr->transport_return = PENDING_OK; /* allow set_errno action */
3169 goto RESPONSE_FAILED;
3172 /* Update the journal, or setup retry. */
3173 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3174 if (addr->transport_return == OK)
3176 if (testflag(addr, af_homonym))
3177 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3179 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3181 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3182 len = Ustrlen(CS sx.buffer);
3183 if (write(journal_fd, sx.buffer, len) != len)
3184 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3185 "%s: %s", sx.buffer, strerror(errno));
3187 else if (addr->transport_return == DEFER)
3188 retry_add_item(addr, addr->address_retry_key, -2);
3192 /* Ensure the journal file is pushed out to disk. */
3194 if (EXIMfsync(journal_fd) < 0)
3195 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3201 /* Handle general (not specific to one address) failures here. The value of ok
3202 is used to skip over this code on the falling through case. A timeout causes a
3203 deferral. Other errors may defer or fail according to the response code, and
3204 may set up a special errno value, e.g. after connection chopped, which is
3205 assumed if errno == 0 and there is no text in the buffer. If control reaches
3206 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3207 the problem is not related to this specific message. */
3212 uschar * set_message;
3218 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3219 sx.buffer, &code, &message, &pass_message);
3227 message = string_sprintf("send() to %s [%s] failed: %s",
3228 host->name, host->address, message ? message : US strerror(save_errno));
3229 sx.send_quit = FALSE;
3237 sx.ok = FALSE; /* For when reached by GOTO */
3238 set_message = message;
3240 /* We want to handle timeouts after MAIL or "." and loss of connection after
3241 "." specially. They can indicate a problem with the sender address or with
3242 the contents of the message rather than a real error on the connection. These
3243 cases are treated in the same way as a 4xx response. This next bit of code
3244 does the classification. */
3251 message_error = TRUE;
3255 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3256 Ustrncmp(smtp_command,"end ",4) == 0;
3259 case ERRNO_SMTPCLOSED:
3260 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3264 message_error = FALSE;
3268 /* Handle the cases that are treated as message errors. These are:
3270 (a) negative response or timeout after MAIL
3271 (b) negative response after DATA
3272 (c) negative response or timeout or dropped connection after "."
3273 (d) utf8 support required and not offered
3275 It won't be a negative response or timeout after RCPT, as that is dealt
3276 with separately above. The action in all cases is to set an appropriate
3277 error code for all the addresses, but to leave yield set to OK because the
3278 host itself has not failed. Of course, it might in practice have failed
3279 when we've had a timeout, but if so, we'll discover that at the next
3280 delivery attempt. For a temporary error, set the message_defer flag, and
3281 write to the logs for information if this is not the last host. The error
3282 for the last host will be logged as part of the address's log line. */
3286 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3288 /* If there's an errno, the message contains just the identity of
3293 else /* Anything other than 5 is treated as temporary */
3297 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3298 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3299 msglog_line(host, message);
3300 *message_defer = TRUE;
3304 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3305 ".", or some other transportation error. We defer all addresses and yield
3306 DEFER, except for the case of failed add_headers expansion, or a transport
3307 filter failure, when the yield should be ERROR, to stop it trying other
3313 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3314 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3318 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3319 #ifdef EXPERIMENTAL_DSN_INFO
3320 , sx.smtp_greeting, sx.helo_response
3326 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3327 SMTP session tidily. However, if there were too many addresses to send in one
3328 message (indicated by first_addr being non-NULL) we want to carry on with the
3329 rest of them. Also, it is desirable to send more than one message down the SMTP
3330 connection if there are several waiting, provided we haven't already sent so
3331 many as to hit the configured limit. The function transport_check_waiting looks
3332 for a waiting message and returns its id. Then transport_pass_socket tries to
3333 set up a continued delivery by passing the socket on to another process. The
3334 variable send_rset is FALSE if a message has just been successfully transfered.
3336 If we are already sending down a continued channel, there may be further
3337 addresses not yet delivered that are aimed at the same host, but which have not
3338 been passed in this run of the transport. In this case, continue_more will be
3339 true, and all we should do is send RSET if necessary, and return, leaving the
3342 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3343 do not want to continue with other messages down the same channel, because that
3344 can lead to looping between two or more messages, all with the same,
3345 temporarily failing address(es). [The retry information isn't updated yet, so
3346 new processes keep on trying.] We probably also don't want to try more of this
3347 message's addresses either.
3349 If we have started a TLS session, we have to end it before passing the
3350 connection to a new process. However, not all servers can handle this (Exim
3351 can), so we do not pass such a connection on if the host matches
3352 hosts_nopass_tls. */
3355 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3356 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3357 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3359 if (sx.completed_addr && sx.ok && sx.send_quit)
3362 smtp_compare_t t_compare;
3364 t_compare.tblock = tblock;
3365 t_compare.current_sender_address = sender_address;
3367 if ( sx.first_addr != NULL
3371 ( tls_out.active < 0 && !continue_proxy_cipher
3372 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3376 transport_check_waiting(tblock->name, host->name,
3377 tblock->connection_max_messages, new_message_id, &more,
3378 (oicf)smtp_are_same_identities, (void*)&t_compare)
3385 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3387 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3388 host->address, strerror(errno));
3389 sx.send_quit = FALSE;
3391 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3392 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3395 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3399 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3400 host->name, host->address, msg);
3404 /* Either RSET was not needed, or it succeeded */
3409 int socket_fd = sx.inblock.sock;
3412 if (sx.first_addr != NULL) /* More addresses still to be sent */
3413 { /* in this run of the transport */
3414 continue_sequence++; /* Causes * in logging */
3418 /* Unless caller said it already has more messages listed for this host,
3419 pass the connection on to a new Exim process (below, the call to
3420 transport_pass_socket). If the caller has more ready, just return with
3421 the connection still open. */
3424 if (tls_out.active >= 0)
3426 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3428 /* Before passing the socket on, or returning to caller with it still
3429 open, we must shut down TLS. Not all MTAs allow for the continuation
3430 of the SMTP session when TLS is shut down. We test for this by sending
3431 a new EHLO. If we don't get a good response, we don't attempt to pass
3434 tls_close(FALSE, TRUE);
3435 smtp_peer_options = smtp_peer_options_wrap;
3437 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3438 "EHLO %s\r\n", sx.helo_data) >= 0
3439 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3440 '2', sx.ob->command_timeout);
3442 if (sx.ok && continue_more)
3443 return yield; /* More addresses for another run */
3447 /* Set up a pipe for proxying TLS for the new transport process */
3449 smtp_peer_options |= OPTION_TLS;
3450 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3453 set_errno(sx.first_addr, errno, US"internal allocation problem",
3455 # ifdef EXPERIMENTAL_DSN_INFO
3456 , sx.smtp_greeting, sx.helo_response
3463 return yield; /* More addresses for another run */
3465 /* If the socket is successfully passed, we mustn't send QUIT (or
3466 indeed anything!) from here. */
3468 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3469 propagate it from the initial
3471 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3472 host->address, new_message_id, socket_fd))
3474 sx.send_quit = FALSE;
3476 /* If TLS is still active, we need to proxy it for the transport we
3477 just passed the baton to. Fork a child to to do it, and return to
3478 get logging done asap. Which way to place the work makes assumptions
3479 about post-fork prioritisation which may not hold on all platforms. */
3481 if (tls_out.active >= 0)
3484 if (pid > 0) /* parent */
3486 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3488 waitpid(pid, NULL, 0);
3489 tls_close(FALSE, FALSE);
3490 (void)close(sx.inblock.sock);
3491 continue_transport = NULL;
3492 continue_hostname = NULL;
3495 else if (pid == 0) /* child; fork again to disconnect totally */
3500 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3501 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3503 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3511 /* If RSET failed and there are addresses left, they get deferred. */
3513 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3514 #ifdef EXPERIMENTAL_DSN_INFO
3515 , sx.smtp_greeting, sx.helo_response
3521 /* End off tidily with QUIT unless the connection has died or the socket has
3522 been passed to another process. There has been discussion on the net about what
3523 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3524 to wait for a response, but on the other hand, there isn't anything one can do
3525 with an error response, other than log it. Exim used to do that. However,
3526 further discussion suggested that it is positively advantageous not to wait for
3527 the response, but to close the session immediately. This is supposed to move
3528 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3529 load from the server. (Hosts that are both servers and clients may not see much
3530 difference, of course.) Further discussion indicated that this was safe to do
3531 on Unix systems which have decent implementations of TCP/IP that leave the
3532 connection around for a while (TIME_WAIT) after the application has gone away.
3533 This enables the response sent by the server to be properly ACKed rather than
3534 timed out, as can happen on broken TCP/IP implementations on other OS.
3536 This change is being made on 31-Jul-98. After over a year of trouble-free
3537 operation, the old commented-out code was removed on 17-Sep-99. */
3540 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3545 tls_close(FALSE, TRUE);
3548 /* Close the socket, and return the appropriate value, first setting
3549 works because the NULL setting is passed back to the calling process, and
3550 remote_max_parallel is forced to 1 when delivering over an existing connection,
3552 If all went well and continue_more is set, we shouldn't actually get here if
3553 there are further addresses, as the return above will be taken. However,
3554 writing RSET might have failed, or there may be other addresses whose hosts are
3555 specified in the transports, and therefore not visible at top level, in which
3556 case continue_more won't get set. */
3558 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3561 shutdown(sx.outblock.sock, SHUT_WR);
3562 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3563 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3564 rc--; /* drain socket */
3566 (void)close(sx.inblock.sock);
3568 #ifndef DISABLE_EVENT
3569 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3572 continue_transport = NULL;
3573 continue_hostname = NULL;
3580 /*************************************************
3581 * Closedown entry point *
3582 *************************************************/
3584 /* This function is called when exim is passed an open smtp channel
3585 from another incarnation, but the message which it has been asked
3586 to deliver no longer exists. The channel is on stdin.
3588 We might do fancy things like looking for another message to send down
3589 the channel, but if the one we sought has gone, it has probably been
3590 delivered by some other process that itself will seek further messages,
3591 so just close down our connection.
3593 Argument: pointer to the transport instance block
3598 smtp_transport_closedown(transport_instance *tblock)
3600 smtp_transport_options_block *ob =
3601 (smtp_transport_options_block *)tblock->options_block;
3602 smtp_inblock inblock;
3603 smtp_outblock outblock;
3605 uschar inbuffer[4096];
3606 uschar outbuffer[16];
3608 inblock.sock = fileno(stdin);
3609 inblock.buffer = inbuffer;
3610 inblock.buffersize = sizeof(inbuffer);
3611 inblock.ptr = inbuffer;
3612 inblock.ptrend = inbuffer;
3614 outblock.sock = inblock.sock;
3615 outblock.buffersize = sizeof(outbuffer);
3616 outblock.buffer = outbuffer;
3617 outblock.ptr = outbuffer;
3618 outblock.cmd_count = 0;
3619 outblock.authenticating = FALSE;
3621 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3622 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3623 ob->command_timeout);
3624 (void)close(inblock.sock);
3629 /*************************************************
3630 * Prepare addresses for delivery *
3631 *************************************************/
3633 /* This function is called to flush out error settings from previous delivery
3634 attempts to other hosts. It also records whether we got here via an MX record
3635 or not in the more_errno field of the address. We are interested only in
3636 addresses that are still marked DEFER - others may have got delivered to a
3637 previously considered IP address. Set their status to PENDING_DEFER to indicate
3638 which ones are relevant this time.
3641 addrlist the list of addresses
3642 host the host we are delivering to
3644 Returns: the first address for this delivery
3647 static address_item *
3648 prepare_addresses(address_item *addrlist, host_item *host)
3650 address_item *first_addr = NULL;
3652 for (addr = addrlist; addr; addr = addr->next)
3653 if (addr->transport_return == DEFER)
3655 if (!first_addr) first_addr = addr;
3656 addr->transport_return = PENDING_DEFER;
3657 addr->basic_errno = 0;
3658 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3659 addr->message = NULL;
3661 addr->cipher = NULL;
3662 addr->ourcert = NULL;
3663 addr->peercert = NULL;
3664 addr->peerdn = NULL;
3665 addr->ocsp = OCSP_NOT_REQ;
3667 #ifdef EXPERIMENTAL_DSN_INFO
3668 addr->smtp_greeting = NULL;
3669 addr->helo_response = NULL;
3677 /*************************************************
3678 * Main entry point *
3679 *************************************************/
3681 /* See local README for interface details. As this is a remote transport, it is
3682 given a chain of addresses to be delivered in one connection, if possible. It
3683 always returns TRUE, indicating that each address has its own independent
3684 status set, except if there is a setting up problem, in which case it returns
3688 smtp_transport_entry(
3689 transport_instance *tblock, /* data for this instantiation */
3690 address_item *addrlist) /* addresses we are working on */
3694 int hosts_defer = 0;
3696 int hosts_looked_up = 0;
3697 int hosts_retry = 0;
3698 int hosts_serial = 0;
3699 int hosts_total = 0;
3700 int total_hosts_tried = 0;
3702 BOOL expired = TRUE;
3703 uschar *expanded_hosts = NULL;
3705 uschar *tid = string_sprintf("%s transport", tblock->name);
3706 smtp_transport_options_block *ob =
3707 (smtp_transport_options_block *)(tblock->options_block);
3708 host_item *hostlist = addrlist->host_list;
3709 host_item *host = NULL;
3713 debug_printf("%s transport entered\n", tblock->name);
3714 for (addr = addrlist; addr; addr = addr->next)
3715 debug_printf(" %s\n", addr->address);
3718 debug_printf("hostlist:\n");
3719 for (host = hostlist; host; host = host->next)
3720 debug_printf(" %s:%d\n", host->name, host->port);
3722 if (continue_hostname)
3723 debug_printf("already connected to %s [%s] (on fd %d)\n",
3724 continue_hostname, continue_host_address,
3725 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3728 /* Set the flag requesting that these hosts be added to the waiting
3729 database if the delivery fails temporarily or if we are running with
3730 queue_smtp or a 2-stage queue run. This gets unset for certain
3731 kinds of error, typically those that are specific to the message. */
3733 update_waiting = TRUE;
3735 /* If a host list is not defined for the addresses - they must all have the
3736 same one in order to be passed to a single transport - or if the transport has
3737 a host list with hosts_override set, use the host list supplied with the
3738 transport. It is an error for this not to exist. */
3740 if (!hostlist || (ob->hosts_override && ob->hosts))
3744 addrlist->message = string_sprintf("%s transport called with no hosts set",
3746 addrlist->transport_return = PANIC;
3747 return FALSE; /* Only top address has status */
3750 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3753 /* If the transport's host list contains no '$' characters, and we are not
3754 randomizing, it is fixed and therefore a chain of hosts can be built once
3755 and for all, and remembered for subsequent use by other calls to this
3756 transport. If, on the other hand, the host list does contain '$', or we are
3757 randomizing its order, we have to rebuild it each time. In the fixed case,
3758 as the hosts string will never be used again, it doesn't matter that we
3759 replace all the : characters with zeros. */
3763 uschar *s = ob->hosts;
3765 if (Ustrchr(s, '$') != NULL)
3767 if (!(expanded_hosts = expand_string(s)))
3769 addrlist->message = string_sprintf("failed to expand list of hosts "
3770 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3771 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3772 return FALSE; /* Only top address has status */
3774 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3775 "\"%s\"\n", s, expanded_hosts);
3779 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3781 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3783 /* Check that the expansion yielded something useful. */
3787 string_sprintf("%s transport has empty hosts setting", tblock->name);
3788 addrlist->transport_return = PANIC;
3789 return FALSE; /* Only top address has status */
3792 /* If there was no expansion of hosts, save the host list for
3795 if (!expanded_hosts) ob->hostlist = hostlist;
3798 /* This is not the first time this transport has been run in this delivery;
3799 the host list was built previously. */
3802 hostlist = ob->hostlist;
3805 /* The host list was supplied with the address. If hosts_randomize is set, we
3806 must sort it into a random order if it did not come from MX records and has not
3807 already been randomized (but don't bother if continuing down an existing
3810 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3812 host_item *newlist = NULL;
3815 host_item *h = hostlist;
3816 hostlist = hostlist->next;
3818 h->sort_key = random_number(100);
3825 else if (h->sort_key < newlist->sort_key)
3832 host_item *hh = newlist;
3835 if (h->sort_key < hh->next->sort_key) break;
3843 hostlist = addrlist->host_list = newlist;
3846 /* Sort out the default port. */
3848 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3850 /* For each host-plus-IP-address on the list:
3852 . If this is a continued delivery and the host isn't the one with the
3853 current connection, skip.
3855 . If the status is unusable (i.e. previously failed or retry checked), skip.
3857 . If no IP address set, get the address, either by turning the name into
3858 an address, calling gethostbyname if gethostbyname is on, or by calling
3859 the DNS. The DNS may yield multiple addresses, in which case insert the
3860 extra ones into the list.
3862 . Get the retry data if not previously obtained for this address and set the
3863 field which remembers the state of this address. Skip if the retry time is
3864 not reached. If not, remember whether retry data was found. The retry string
3865 contains both the name and the IP address.
3867 . Scan the list of addresses and mark those whose status is DEFER as
3868 PENDING_DEFER. These are the only ones that will be processed in this cycle
3871 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3872 Some addresses may be successfully delivered, others may fail, and yet
3873 others may get temporary errors and so get marked DEFER.
3875 . The return from the delivery attempt is OK if a connection was made and a
3876 valid SMTP dialogue was completed. Otherwise it is DEFER.
3878 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3880 . If fail to connect, or other defer state, add a retry item.
3882 . If there are any addresses whose status is still DEFER, carry on to the
3883 next host/IPaddress, unless we have tried the number of hosts given
3884 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3885 there is some fancy logic for hosts_max_try that means its limit can be
3886 overstepped in some circumstances.
3888 If we get to the end of the list, all hosts have deferred at least one address,
3889 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3890 delivery attempt to those hosts whose last try was before the arrival time of
3891 the current message. To cope with this, we have to go round the loop a second
3892 time. After that, set the status and error data for any addresses that haven't
3893 had it set already. */
3895 for (cutoff_retry = 0;
3896 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3899 host_item *nexthost = NULL;
3900 int unexpired_hosts_tried = 0;
3902 for (host = hostlist;
3904 && unexpired_hosts_tried < ob->hosts_max_try
3905 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3911 BOOL host_is_expired = FALSE;
3912 BOOL message_defer = FALSE;
3913 BOOL some_deferred = FALSE;
3914 address_item *first_addr = NULL;
3915 uschar *interface = NULL;
3916 uschar *retry_host_key = NULL;
3917 uschar *retry_message_key = NULL;
3918 uschar *serialize_key = NULL;
3920 /* Default next host is next host. :-) But this can vary if the
3921 hosts_max_try limit is hit (see below). It may also be reset if a host
3922 address is looked up here (in case the host was multihomed). */
3924 nexthost = host->next;
3926 /* If the address hasn't yet been obtained from the host name, look it up
3927 now, unless the host is already marked as unusable. If it is marked as
3928 unusable, it means that the router was unable to find its IP address (in
3929 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3930 the lookup failed last time. We don't get this far if *all* MX records
3931 point to non-existent hosts; that is treated as a hard error.
3933 We can just skip this host entirely. When the hosts came from the router,
3934 the address will timeout based on the other host(s); when the address is
3935 looked up below, there is an explicit retry record added.
3937 Note that we mustn't skip unusable hosts if the address is not unset; they
3938 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3942 int new_port, flags;
3945 if (host->status >= hstatus_unusable)
3947 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3952 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3954 /* The host name is permitted to have an attached port. Find it, and
3955 strip it from the name. Just remember it for now. */
3957 new_port = host_item_get_port(host);
3959 /* Count hosts looked up */
3963 /* Find by name if so configured, or if it's an IP address. We don't
3964 just copy the IP address, because we need the test-for-local to happen. */
3966 flags = HOST_FIND_BY_A;
3967 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3968 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3970 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3971 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3973 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3974 &ob->dnssec, /* domains for request/require */
3977 /* Update the host (and any additional blocks, resulting from
3978 multihoming) with a host-specific port, if any. */
3980 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3982 /* Failure to find the host at this time (usually DNS temporary failure)
3983 is really a kind of routing failure rather than a transport failure.
3984 Therefore we add a retry item of the routing kind, not to stop us trying
3985 to look this name up here again, but to ensure the address gets timed
3986 out if the failures go on long enough. A complete failure at this point
3987 commonly points to a configuration error, but the best action is still
3988 to carry on for the next host. */
3990 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3992 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3994 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3995 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3996 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3997 host->status = hstatus_unusable;
3999 for (addr = addrlist; addr; addr = addr->next)
4001 if (addr->transport_return != DEFER) continue;
4002 addr->basic_errno = ERRNO_UNKNOWNHOST;
4003 addr->message = string_sprintf(
4004 rc == HOST_FIND_SECURITY
4005 ? "lookup of IP address for %s was insecure"
4006 : "failed to lookup IP address for %s",
4012 /* If the host is actually the local host, we may have a problem, or
4013 there may be some cunning configuration going on. In the problem case,
4014 log things and give up. The default transport status is already DEFER. */
4016 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4018 for (addr = addrlist; addr; addr = addr->next)
4020 addr->basic_errno = 0;
4021 addr->message = string_sprintf("%s transport found host %s to be "
4022 "local", tblock->name, host->name);
4026 } /* End of block for IP address lookup */
4028 /* If this is a continued delivery, we are interested only in the host
4029 which matches the name of the existing open channel. The check is put
4030 here after the local host lookup, in case the name gets expanded as a
4031 result of the lookup. Set expired FALSE, to save the outer loop executing
4034 if ( continue_hostname
4035 && ( Ustrcmp(continue_hostname, host->name) != 0
4036 || Ustrcmp(continue_host_address, host->address) != 0
4040 continue; /* With next host */
4043 /* Reset the default next host in case a multihomed host whose addresses
4044 are not looked up till just above added to the host list. */
4046 nexthost = host->next;
4048 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4049 domain is in queue_smtp_domains, we don't actually want to attempt any
4050 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4051 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4052 were not in it. We don't want to hold up all SMTP deliveries! Except when
4053 doing a two-stage queue run, don't do this if forcing. */
4055 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4056 match_isinlist(addrlist->domain,
4057 (const uschar **)&queue_smtp_domains, 0,
4058 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4061 for (addr = addrlist; addr; addr = addr->next)
4062 if (addr->transport_return == DEFER)
4063 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4064 continue; /* With next host */
4067 /* Count hosts being considered - purely for an intelligent comment
4068 if none are usable. */
4072 /* Set $host and $host address now in case they are needed for the
4073 interface expansion or the serialize_hosts check; they remain set if an
4074 actual delivery happens. */
4076 deliver_host = host->name;
4077 deliver_host_address = host->address;
4078 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4079 : host->dnssec == DS_NO ? US"no"
4082 /* Set up a string for adding to the retry key if the port number is not
4083 the standard SMTP port. A host may have its own port setting that overrides
4086 pistring = string_sprintf(":%d", host->port == PORT_NONE
4087 ? defport : host->port);
4088 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4090 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4091 string is set, even if constant (as different transports can have different
4092 constant settings), we must add it to the key that is used for retries,
4093 because connections to the same host from a different interface should be
4094 treated separately. */
4096 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4097 if ((rs = ob->interface) && *rs)
4099 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4101 pistring = string_sprintf("%s/%s", pistring, interface);
4104 /* The first time round the outer loop, check the status of the host by
4105 inspecting the retry data. The second time round, we are interested only
4106 in expired hosts that haven't been tried since this message arrived. */
4108 if (cutoff_retry == 0)
4111 /* Ensure the status of the address is set by checking retry data if
4112 necessary. There may be host-specific retry data (applicable to all
4113 messages) and also data for retries of a specific message at this host.
4114 If either of these retry records are actually read, the keys used are
4115 returned to save recomputing them later. */
4117 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4118 US"retry_include_ip_address", ob->retry_include_ip_address,
4119 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4120 continue; /* with next host */
4122 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4123 incl_ip, &retry_host_key, &retry_message_key);
4125 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4126 (host->address == NULL)? US"" : host->address, pistring,
4127 (host->status == hstatus_usable)? "usable" :
4128 (host->status == hstatus_unusable)? "unusable" :
4129 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4131 /* Skip this address if not usable at this time, noting if it wasn't
4132 actually expired, both locally and in the address. */
4134 switch (host->status)
4136 case hstatus_unusable:
4138 setflag(addrlist, af_retry_skipped);
4141 case hstatus_unusable_expired:
4144 case hwhy_retry: hosts_retry++; break;
4145 case hwhy_failed: hosts_fail++; break;
4147 case hwhy_deferred: hosts_defer++; break;
4150 /* If there was a retry message key, implying that previously there
4151 was a message-specific defer, we don't want to update the list of
4152 messages waiting for these hosts. */
4154 if (retry_message_key) update_waiting = FALSE;
4155 continue; /* With the next host or IP address */
4159 /* Second time round the loop: if the address is set but expired, and
4160 the message is newer than the last try, let it through. */
4165 || host->status != hstatus_unusable_expired
4166 || host->last_try > received_time.tv_sec)
4168 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4169 host->name, host->address, pistring);
4170 host_is_expired = TRUE;
4173 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4174 it remains TRUE only if all hosts are expired and none are actually tried.
4179 /* If this host is listed as one to which access must be serialized,
4180 see if another Exim process has a connection to it, and if so, skip
4181 this host. If not, update the database to record our connection to it
4182 and remember this for later deletion. Do not do any of this if we are
4183 sending the message down a pre-existing connection. */
4185 if ( !continue_hostname
4186 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4188 serialize_key = string_sprintf("host-serialize-%s", host->name);
4189 if (!enq_start(serialize_key, 1))
4192 debug_printf("skipping host %s because another Exim process "
4193 "is connected to it\n", host->name);
4199 /* OK, we have an IP address that is not waiting for its retry time to
4200 arrive (it might be expired) OR (second time round the loop) we have an
4201 expired host that hasn't been tried since the message arrived. Have a go
4202 at delivering the message to it. First prepare the addresses by flushing
4203 out the result of previous attempts, and finding the first address that
4204 is still to be delivered. */
4206 first_addr = prepare_addresses(addrlist, host);
4208 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4209 message_id, host->name, host->address, addrlist->address,
4210 addrlist->next ? ", ..." : "");
4212 set_process_info("delivering %s to %s [%s] (%s%s)",
4213 message_id, host->name, host->address, addrlist->address,
4214 addrlist->next ? ", ..." : "");
4216 /* This is not for real; don't do the delivery. If there are
4217 any remaining hosts, list them. */
4222 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4223 for (addr = addrlist; addr; addr = addr->next)
4225 addr->host_used = host;
4226 addr->special_action = '*';
4227 addr->message = US"delivery bypassed by -N option";
4231 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4232 "*** host and remaining hosts:\n", tblock->name);
4233 for (host2 = host; host2; host2 = host2->next)
4234 debug_printf(" %s [%s]\n", host2->name,
4235 host2->address ? host2->address : US"unset");
4240 /* This is for real. If the host is expired, we don't count it for
4241 hosts_max_retry. This ensures that all hosts must expire before an address
4242 is timed out, unless hosts_max_try_hardlimit (which protects against
4243 lunatic DNS configurations) is reached.
4245 If the host is not expired and we are about to hit the hosts_max_retry
4246 limit, check to see if there is a subsequent hosts with a different MX
4247 value. If so, make that the next host, and don't count this one. This is a
4248 heuristic to make sure that different MXs do get tried. With a normal kind
4249 of retry rule, they would get tried anyway when the earlier hosts were
4250 delayed, but if the domain has a "retry every time" type of rule - as is
4251 often used for the the very large ISPs, that won't happen. */
4256 /* Make a copy of the host if it is local to this invocation
4257 of the transport. */
4261 thost = store_get(sizeof(host_item));
4263 thost->name = string_copy(host->name);
4264 thost->address = string_copy(host->address);
4269 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4273 debug_printf("hosts_max_try limit reached with this host\n");
4274 for (h = host; h; h = h->next) if (h->mx != host->mx)
4277 unexpired_hosts_tried--;
4278 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4279 "and will be tried\n");
4284 /* Attempt the delivery. */
4286 total_hosts_tried++;
4287 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4288 &message_defer, FALSE);
4291 OK => connection made, each address contains its result;
4292 message_defer is set for message-specific defers (when all
4293 recipients are marked defer)
4294 DEFER => there was a non-message-specific delivery problem;
4295 ERROR => there was a problem setting up the arguments for a filter,
4296 or there was a problem with expanding added headers
4299 /* If the result is not OK, there was a non-message-specific problem.
4300 If the result is DEFER, we need to write to the logs saying what happened
4301 for this particular host, except in the case of authentication and TLS
4302 failures, where the log has already been written. If all hosts defer a
4303 general message is written at the end. */
4305 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4306 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4307 write_logs(first_addr, host);
4309 #ifndef DISABLE_EVENT
4311 deferred_event_raise(first_addr, host);
4314 /* If STARTTLS was accepted, but there was a failure in setting up the
4315 TLS session (usually a certificate screwup), and the host is not in
4316 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4317 TLS forcibly turned off. We have to start from scratch with a new SMTP
4318 connection. That's why the retry is done from here, not from within
4319 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4320 session, so the in-clear transmission after those errors, if permitted,
4321 happens inside smtp_deliver().] */
4325 && first_addr->basic_errno == ERRNO_TLSFAILURE
4326 && ob->tls_tempfail_tryclear
4327 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4330 log_write(0, LOG_MAIN,
4331 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4332 first_addr->message, host->name, host->address);
4333 first_addr = prepare_addresses(addrlist, host);
4334 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4335 &message_defer, TRUE);
4336 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4337 write_logs(first_addr, host);
4338 # ifndef DISABLE_EVENT
4340 deferred_event_raise(first_addr, host);
4343 #endif /*SUPPORT_TLS*/
4346 /* Delivery attempt finished */
4348 rs = rc == OK ? US"OK"
4349 : rc == DEFER ? US"DEFER"
4350 : rc == ERROR ? US"ERROR"
4353 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4354 message_id, host->name, host->address, addrlist->address,
4355 addrlist->next ? " (& others)" : "", rs);
4357 /* Release serialization if set up */
4359 if (serialize_key) enq_end(serialize_key);
4361 /* If the result is DEFER, or if a host retry record is known to exist, we
4362 need to add an item to the retry chain for updating the retry database
4363 at the end of delivery. We only need to add the item to the top address,
4364 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4365 for any other delivery attempts using the same address. (It is copied into
4366 the unusable tree at the outer level, so even if different address blocks
4367 contain the same address, it still won't get tried again.) */
4369 if (rc == DEFER || retry_host_key)
4371 int delete_flag = rc != DEFER ? rf_delete : 0;
4372 if (!retry_host_key)
4375 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4376 US"retry_include_ip_address", ob->retry_include_ip_address,
4377 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4378 incl_ip = TRUE; /* error; use most-specific retry record */
4380 retry_host_key = incl_ip
4381 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4382 : string_sprintf("T:%S%s", host->name, pistring);
4385 /* If a delivery of another message over an existing SMTP connection
4386 yields DEFER, we do NOT set up retry data for the host. This covers the
4387 case when there are delays in routing the addresses in the second message
4388 that are so long that the server times out. This is alleviated by not
4389 routing addresses that previously had routing defers when handling an
4390 existing connection, but even so, this case may occur (e.g. if a
4391 previously happily routed address starts giving routing defers). If the
4392 host is genuinely down, another non-continued message delivery will
4393 notice it soon enough. */
4395 if (delete_flag != 0 || !continue_hostname)
4396 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4398 /* We may have tried an expired host, if its retry time has come; ensure
4399 the status reflects the expiry for the benefit of any other addresses. */
4403 host->status = host_is_expired
4404 ? hstatus_unusable_expired : hstatus_unusable;
4405 host->why = hwhy_deferred;
4409 /* If message_defer is set (host was OK, but every recipient got deferred
4410 because of some message-specific problem), or if that had happened
4411 previously so that a message retry key exists, add an appropriate item
4412 to the retry chain. Note that if there was a message defer but now there is
4413 a host defer, the message defer record gets deleted. That seems perfectly
4414 reasonable. Also, stop the message from being remembered as waiting
4415 for specific hosts. */
4417 if (message_defer || retry_message_key)
4419 int delete_flag = message_defer ? 0 : rf_delete;
4420 if (!retry_message_key)
4423 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4424 US"retry_include_ip_address", ob->retry_include_ip_address,
4425 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4426 incl_ip = TRUE; /* error; use most-specific retry record */
4428 retry_message_key = incl_ip
4429 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4431 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4433 retry_add_item(addrlist, retry_message_key,
4434 rf_message | rf_host | delete_flag);
4435 update_waiting = FALSE;
4438 /* Any return other than DEFER (that is, OK or ERROR) means that the
4439 addresses have got their final statuses filled in for this host. In the OK
4440 case, see if any of them are deferred. */
4443 for (addr = addrlist; addr; addr = addr->next)
4444 if (addr->transport_return == DEFER)
4446 some_deferred = TRUE;
4450 /* If no addresses deferred or the result was ERROR, return. We do this for
4451 ERROR because a failing filter set-up or add_headers expansion is likely to
4452 fail for any host we try. */
4454 if (rc == ERROR || (rc == OK && !some_deferred))
4456 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4457 return TRUE; /* Each address has its status */
4460 /* If the result was DEFER or some individual addresses deferred, let
4461 the loop run to try other hosts with the deferred addresses, except for the
4462 case when we were trying to deliver down an existing channel and failed.
4463 Don't try any other hosts in this case. */
4465 if (continue_hostname) break;
4467 /* If the whole delivery, or some individual addresses, were deferred and
4468 there are more hosts that could be tried, do not count this host towards
4469 the hosts_max_try limit if the age of the message is greater than the
4470 maximum retry time for this host. This means we may try try all hosts,
4471 ignoring the limit, when messages have been around for some time. This is
4472 important because if we don't try all hosts, the address will never time
4473 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4475 if ((rc == DEFER || some_deferred) && nexthost)
4478 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4480 if (retry && retry->rules)
4482 retry_rule *last_rule;
4483 for (last_rule = retry->rules;
4485 last_rule = last_rule->next);
4486 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4488 else timedout = TRUE; /* No rule => timed out */
4492 unexpired_hosts_tried--;
4493 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4494 "hosts_max_try (message older than host's retry time)\n");
4497 } /* End of loop for trying multiple hosts. */
4499 /* This is the end of the loop that repeats iff expired is TRUE and
4500 ob->delay_after_cutoff is FALSE. The second time round we will
4501 try those hosts that haven't been tried since the message arrived. */
4505 debug_printf("all IP addresses skipped or deferred at least one address\n");
4506 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4507 debug_printf("retrying IP addresses not tried since message arrived\n");
4512 /* Get here if all IP addresses are skipped or defer at least one address. In
4513 MUA wrapper mode, this will happen only for connection or other non-message-
4514 specific failures. Force the delivery status for all addresses to FAIL. */
4518 for (addr = addrlist; addr; addr = addr->next)
4519 addr->transport_return = FAIL;
4523 /* In the normal, non-wrapper case, add a standard message to each deferred
4524 address if there hasn't been an error, that is, if it hasn't actually been
4525 tried this time. The variable "expired" will be FALSE if any deliveries were
4526 actually tried, or if there was at least one host that was not expired. That
4527 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4528 a delivery has been tried, an error code will be set, and the failing of the
4529 message is handled by the retry code later.
4531 If queue_smtp is set, or this transport was called to send a subsequent message
4532 down an existing TCP/IP connection, and something caused the host not to be
4533 found, we end up here, but can detect these cases and handle them specially. */
4535 for (addr = addrlist; addr; addr = addr->next)
4537 /* If host is not NULL, it means that we stopped processing the host list
4538 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4539 means we need to behave as if some hosts were skipped because their retry
4540 time had not come. Specifically, this prevents the address from timing out.
4541 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4542 hosts were tried. */
4545 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4548 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4549 "hosts were tried\n");
4554 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4555 setflag(addr, af_retry_skipped);
4558 if (queue_smtp) /* no deliveries attempted */
4560 addr->transport_return = DEFER;
4561 addr->basic_errno = 0;
4562 addr->message = US"SMTP delivery explicitly queued";
4565 else if ( addr->transport_return == DEFER
4566 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4570 addr->basic_errno = ERRNO_HRETRY;
4571 if (continue_hostname)
4572 addr->message = US"no host found for existing SMTP connection";
4575 setflag(addr, af_pass_message); /* This is not a security risk */
4576 addr->message = string_sprintf(
4577 "all hosts%s have been failing for a long time %s",
4578 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4579 ob->delay_after_cutoff
4580 ? US"(and retry time not reached)"
4581 : US"and were last tried after this message arrived");
4583 /* If we are already using fallback hosts, or there are no fallback hosts
4584 defined, convert the result to FAIL to cause a bounce. */
4586 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4587 addr->transport_return = FAIL;
4592 if (hosts_retry == hosts_total)
4593 s = "retry time not reached for any host%s";
4594 else if (hosts_fail == hosts_total)
4595 s = "all host address lookups%s failed permanently";
4596 else if (hosts_defer == hosts_total)
4597 s = "all host address lookups%s failed temporarily";
4598 else if (hosts_serial == hosts_total)
4599 s = "connection limit reached for all hosts%s";
4600 else if (hosts_fail+hosts_defer == hosts_total)
4601 s = "all host address lookups%s failed";
4603 s = "some host address lookups failed and retry time "
4604 "not reached for other hosts or connection limit reached%s";
4606 addr->message = string_sprintf(s,
4607 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4612 /* Update the database which keeps information about which messages are waiting
4613 for which hosts to become available. For some message-specific errors, the
4614 update_waiting flag is turned off because we don't want follow-on deliveries in
4615 those cases. If this transport instance is explicitly limited to one message
4616 per connection then follow-on deliveries are not possible and there's no need
4617 to create/update the per-transport wait-<transport_name> database. */
4619 if (update_waiting && tblock->connection_max_messages != 1)
4620 transport_update_waiting(hostlist, tblock->name);
4624 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4626 return TRUE; /* Each address has its status */
4629 #endif /*!MACRO_PREDEF*/
4632 /* End of transport/smtp.c */