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);
189 /* Default private options block for the smtp transport. */
191 smtp_transport_options_block smtp_transport_option_defaults = {
193 NULL, /* fallback_hosts */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
200 US"smtp", /* protocol */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
210 NULL, /* hosts_try_fastopen */
212 US"*", /* hosts_try_prdr */
215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
216 NULL, /* hosts_require_ocsp */
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 NULL, /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 US"*", /* hosts_noproxy_tls */
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 { NULL, NULL }, /* dnssec_domains {request,require} */
241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
245 FALSE, /* lmtp_ignore_quota */
246 NULL, /* expand_retry_include_ip_address */
247 TRUE /* retry_include_ip_address */
249 ,NULL /* socks_proxy */
252 ,NULL, /* tls_certificate */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
257 US"system", /* tls_verify_certificates */
258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
262 US"*", /* tls_try_verify_hosts */
263 US"*" /* tls_verify_cert_hostnames */
266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
276 /* some DSN flags for use later */
278 static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
281 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
292 /*XXX move to smtp_context */
293 static BOOL pipelining_active; /* current transaction is in pipe mode */
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
315 Returns: OK always (FAIL, DEFER not used)
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
325 errmsg = errmsg; /* Keep picky compilers happy */
329 /* Pass back options if required. This interface is getting very messy. */
333 tf->interface = ob->interface;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
349 if (!testflag(addrlist, af_local_host_removed))
350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
358 /*************************************************
359 * Initialization entry point *
360 *************************************************/
362 /* Called for each instance, after its options have been read, to
363 enable consistency checks to be done, or anything else that needs
366 Argument: pointer to the transport instance block
371 smtp_transport_init(transport_instance *tblock)
373 smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
376 /* Retry_use_local_part defaults FALSE if unset */
378 if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
381 /* Set the default port according to the protocol */
383 if (ob->port == NULL)
384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
387 /* Set up the setup entry point, to be called before subprocesses for this
390 tblock->setup = smtp_transport_setup;
392 /* Complain if any of the timeouts are zero. */
394 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
400 /* If hosts_override is set and there are local hosts, set the global
401 flag that stops verify from showing router hosts. */
403 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
405 /* If there are any fallback hosts listed, build a chain of host items
406 for them, but do not do any lookups at this time. */
408 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
415 /*************************************************
416 * Set delivery info into all active addresses *
417 *************************************************/
419 /* Only addresses whose status is >= PENDING are relevant. A lesser
420 status means that an address is not currently being processed.
423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
428 host if set, mark addrs as having used this host
429 smtp_greeting from peer
430 helo_response from peer
432 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434 this particular type of timeout.
440 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
441 BOOL pass_message, host_item * host
442 #ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
449 if (errno_value == ERRNO_CONNECTTIMEOUT)
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
454 for (addr = addrlist; addr; addr = addr->next)
455 if (addr->transport_return >= PENDING)
457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
462 if (pass_message) setflag(addr, af_pass_message);
464 addr->transport_return = rc;
467 addr->host_used = host;
468 #ifdef EXPERIMENTAL_DSN_INFO
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
482 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
485 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486 #ifdef EXPERIMENTAL_DSN_INFO
493 /*************************************************
494 * Check an SMTP response *
495 *************************************************/
497 /* This function is given an errno code and the SMTP response buffer
498 to analyse, together with the host identification for generating messages. It
499 sets an appropriate message and puts the first digit of the response code into
500 the yield variable. If no response was actually read, a suitable digit is
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
509 message where to put an error message
510 pass_message set TRUE if message is an SMTP response
512 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
516 check_response(host_item *host, int *errno_value, int more_errno,
517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
519 uschar * pl = pipelining_active ? US"pipelined " : US"";
522 *yield = '4'; /* Default setting is to give a temporary error */
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
570 /* Handle error responses from the remote mailer. */
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
576 *pass_message = TRUE;
581 /* No data was read. If there is no errno, this must be the EOF (i.e.
582 connection closed) case, which causes deferral. An explicit connection reset
583 error has the same effect. Otherwise, put the host's identity in the message,
584 leaving the errno value to be interpreted as well. In all cases, we have to
585 assume the connection is now dead. */
587 if (*errno_value == 0 || *errno_value == ECONNRESET)
589 *errno_value = ERRNO_SMTPCLOSED;
590 *message = US string_sprintf("Remote host closed connection "
591 "in response to %s%s", pl, smtp_command);
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
605 /* This writes to the main log and to the message log.
608 addr the address item containing error information
609 host the current host
615 write_logs(address_item *addr, host_item *host)
617 uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
639 msglog_line(host_item * host, uschar * message)
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
647 #ifndef DISABLE_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
656 addr the address item containing error information
657 host the current host
663 deferred_event_raise(address_item *addr, host_item *host)
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
685 (void) event_raise(action, US"msg:host:defer",
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
700 /*************************************************
701 * Synchronize SMTP responses *
702 *************************************************/
704 /* This function is called from smtp_deliver() to receive SMTP responses from
705 the server, and match them up with the commands to which they relate. When
706 PIPELINING is not in use, this function is called after every command, and is
707 therefore somewhat over-engineered, but it is simpler to use a single scheme
708 that works both with and without PIPELINING instead of having two separate sets
711 The set of commands that are buffered up with pipelining may start with MAIL
712 and may end with DATA; in between are RCPT commands that correspond to the
713 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714 etc.) are never buffered.
716 Errors after MAIL or DATA abort the whole process leaving the response in the
717 buffer. After MAIL, pending responses are flushed, and the original command is
718 re-instated in big_buffer for error messages. For RCPT commands, the remote is
719 permitted to reject some recipient addresses while accepting others. However
720 certain errors clearly abort the whole process. Set the value in
721 transport_return to PENDING_OK if the address is accepted. If there is a
722 subsequent general error, it will get reset accordingly. If not, it will get
723 converted to OK at the end.
726 sx smtp connection context
727 count the number of responses to read
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
732 Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
742 sync_responses(smtp_context * sx, int count, int pending_DATA)
744 address_item *addr = sx->sync_addr;
745 smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
749 /* Handle the response for a MAIL command. On error, reinstate the original
750 command in big_buffer for error message use, and flush any further pending
751 responses before returning, except after I/O errors and timeouts. */
753 if (sx->pending_MAIL)
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
761 if (errno == 0 && sx->buffer[0] != 0)
763 uschar flushbuffer[4096];
765 if (sx->buffer[0] == '4')
767 save_errno = ERRNO_MAIL4XX;
768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
773 '2', ob->command_timeout)
774 && (errno != 0 || flushbuffer[0] == 0))
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
784 addr->host_used = sx->host;
791 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 /* Read and handle the required number of RCPT responses, matching each one up
794 with an address by scanning for the next address whose status is PENDING_DEFER.
799 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
801 /* The address was accepted */
802 addr->host_used = sx->host;
804 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
805 '2', ob->command_timeout))
808 addr->transport_return = PENDING_OK;
810 /* If af_dr_retry_exists is set, there was a routing delay on this address;
811 ensure that any address-specific retry record is expunged. We do this both
812 for the basic key and for the version that also includes the sender. */
814 if (testflag(addr, af_dr_retry_exists))
816 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
818 retry_add_item(addr, altkey, rf_delete);
819 retry_add_item(addr, addr->address_retry_key, rf_delete);
823 /* Timeout while reading the response */
825 else if (errno == ETIMEDOUT)
827 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
828 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
829 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
830 retry_add_item(addr, addr->address_retry_key, 0);
831 update_waiting = FALSE;
835 /* Handle other errors in obtaining an SMTP response by returning -1. This
836 will cause all the addresses to be deferred. Restore the SMTP command in
837 big_buffer for which we are checking the response, so the error message
840 else if (errno != 0 || sx->buffer[0] == 0)
842 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
843 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
847 /* Handle SMTP permanent and temporary response codes. */
852 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
853 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
854 string_printing(sx->buffer));
855 setflag(addr, af_pass_message);
857 msglog_line(sx->host, addr->message);
859 /* The response was 5xx */
861 if (sx->buffer[0] == '5')
863 addr->transport_return = FAIL;
867 /* The response was 4xx */
871 addr->transport_return = DEFER;
872 addr->basic_errno = ERRNO_RCPT4XX;
873 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
877 #ifndef DISABLE_EVENT
878 event_defer_errno = addr->more_errno;
879 msg_event_raise(US"msg:rcpt:host:defer", addr);
882 /* Log temporary errors if there are more hosts to be tried.
883 If not, log this last one in the == line. */
886 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
887 sx->host->name, sx->host->address, addr->message);
889 #ifndef DISABLE_EVENT
891 msg_event_raise(US"msg:rcpt:defer", addr);
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
897 update_waiting = FALSE;
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
904 ob->address_retry_include_sender
905 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
906 : addr->address_retry_key,
911 } /* Loop for next RCPT response */
913 /* Update where to start at for the next block of responses, unless we
914 have already handled all the addresses. */
916 if (addr) sx->sync_addr = addr->next;
918 /* Handle a response to DATA. If we have not had any good recipients, either
919 previously or in this block, the response is ignored. */
921 if (pending_DATA != 0 &&
922 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
923 '3', ob->command_timeout))
928 if (pending_DATA > 0 || (yield & 1) != 0)
930 if (errno == 0 && sx->buffer[0] == '4')
932 errno = ERRNO_DATA4XX;
933 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
937 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
942 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943 present) received 3xx. If any RCPTs were handled and yielded anything other
944 than 4xx, yield will be set non-zero. */
951 /* Do the client side of smtp-level authentication */
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
958 ibp, obp comms channel control blocks
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
965 FAIL_SEND Failed communications - transmit
970 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
975 uschar *fail_reason = US"server did not advertise AUTH support";
977 smtp_authenticated = FALSE;
978 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
979 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
981 if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
985 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
993 if (require_auth == OK ||
994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
997 fail_reason = US"no common mechanisms were found";
999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1022 /* Loop to scan supported server mechanisms */
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1033 while (*p != 0 && !isspace(*p)) p++;
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1063 /* Failure after writing a command */
1068 /* Failure after reading a response */
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1089 /* Internal problem, message in buffer. */
1092 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
1103 /* If we haven't authenticated, but are required to, give up. */
1105 if (require_auth == OK && !smtp_authenticated)
1107 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
1117 /* Construct AUTH appendix string for MAIL TO */
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1124 Globals smtp_authenticated
1125 client_authenticated_sender
1126 Return True on error, otherwise buffer has (possibly empty) terminated string
1130 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1133 uschar *local_authenticated_sender = authenticated_sender;
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1139 if (ob->authenticated_sender != NULL)
1141 uschar *new = expand_string(ob->authenticated_sender);
1144 if (!expand_string_forcedfail)
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
1148 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1152 else if (new[0] != 0) local_authenticated_sender = new;
1155 /* Add the authenticated sender address if present */
1157 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1173 #ifdef EXPERIMENTAL_DANE
1174 /* Lookup TLSA record for host/port.
1175 Return: OK success with dnssec; DANE mode
1176 DEFER Do not use this host now, may retry later
1177 FAIL_FORCED No TLSA record; DANE not usable
1178 FAIL Do not use this connection
1182 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1184 /* move this out to host.c given the similarity to dns_lookup() ? */
1186 const uschar * fullname = buffer;
1188 /* TLSA lookup string */
1189 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1191 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1194 if (!dns_is_secure(dnsa))
1196 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1202 return DEFER; /* just defer this TLS'd conn */
1204 case DNS_NODATA: /* no TLSA RR for this lookup */
1205 case DNS_NOMATCH: /* no records at all for this lookup */
1206 return dane_required ? FAIL : FAIL_FORCED;
1210 return dane_required ? FAIL : DEFER;
1217 typedef struct smtp_compare_s
1219 uschar *current_sender_address;
1220 struct transport_instance *tblock;
1224 /* Create a unique string that identifies this message, it is based on
1225 sender_address, helo_data and tls_certificate if enabled.
1229 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1231 address_item * addr1;
1232 uschar * if1 = US"";
1233 uschar * helo1 = US"";
1235 uschar * tlsc1 = US"";
1237 uschar * save_sender_address = sender_address;
1238 uschar * local_identity = NULL;
1239 smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1242 sender_address = sender;
1244 addr1 = deliver_make_addr (sender, TRUE);
1245 deliver_set_expansions(addr1);
1248 if1 = expand_string(ob->interface);
1251 helo1 = expand_string(ob->helo_data);
1254 if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1258 local_identity = string_sprintf ("%s^%s", if1, helo1);
1261 deliver_set_expansions(NULL);
1262 sender_address = save_sender_address;
1264 return local_identity;
1269 /* This routine is a callback that is called from transport_check_waiting.
1270 This function will evaluate the incoming message versus the previous
1271 message. If the incoming message is using a different local identity then
1272 we will veto this new message. */
1275 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1277 uschar * message_local_identity,
1278 * current_local_identity,
1279 * new_sender_address;
1281 current_local_identity =
1282 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1284 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1287 message_local_identity =
1288 smtp_local_identity(new_sender_address, s_compare->tblock);
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1296 ehlo_response(uschar * buf, uschar checks)
1298 size_t bsize = Ustrlen(buf);
1301 if ( checks & PEER_OFFERED_TLS
1302 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1303 checks &= ~PEER_OFFERED_TLS;
1306 if ( checks & PEER_OFFERED_IGNQ
1307 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1308 PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_IGNQ;
1311 if ( checks & PEER_OFFERED_CHUNKING
1312 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1313 checks &= ~PEER_OFFERED_CHUNKING;
1315 #ifndef DISABLE_PRDR
1316 if ( checks & PEER_OFFERED_PRDR
1317 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1318 checks &= ~PEER_OFFERED_PRDR;
1322 if ( checks & PEER_OFFERED_UTF8
1323 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_UTF8;
1327 if ( checks & PEER_OFFERED_DSN
1328 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_DSN;
1331 if ( checks & PEER_OFFERED_PIPE
1332 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PIPE;
1336 if ( checks & PEER_OFFERED_SIZE
1337 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_SIZE;
1345 /* Callback for emitting a BDAT data chunk header.
1347 If given a nonzero size, first flush any buffered SMTP commands
1348 then emit the command.
1350 Reap previous SMTP command responses if requested.
1351 Reap one SMTP command response if requested.
1353 Returns: OK or ERROR
1357 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1358 unsigned chunk_size, unsigned flags)
1360 smtp_transport_options_block * ob =
1361 (smtp_transport_options_block *)(tctx->tblock->options_block);
1362 smtp_context * sx = tctx->smtp_context;
1366 /* Write SMTP chunk header command */
1370 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
1372 flags & tc_chunk_last ? " LAST" : "")
1373 ) < 0) return ERROR;
1374 if (flags & tc_chunk_last)
1375 data_command = string_copy(big_buffer); /* Save for later error message */
1378 prev_cmd_count = cmd_count += sx->cmd_count;
1380 /* Reap responses for any previous, but not one we just emitted */
1384 if (sx->pending_BDAT)
1387 if (flags & tc_reap_prev && prev_cmd_count > 0)
1389 DEBUG(D_transport) debug_printf("look for %d responses"
1390 " for previous pipelined cmds\n", prev_cmd_count);
1392 switch(sync_responses(sx, prev_cmd_count, 0))
1394 case 1: /* 2xx (only) => OK */
1395 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1396 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1397 case 0: break; /* No 2xx or 5xx, but no probs */
1399 case -1: /* Timeout on RCPT */
1400 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1403 if (!sx->pending_BDAT)
1404 pipelining_active = FALSE;
1407 /* Reap response for an outstanding BDAT */
1409 if (sx->pending_BDAT)
1411 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1413 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1414 ob->command_timeout))
1416 if (errno == 0 && sx->buffer[0] == '4')
1418 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1419 sx->addrlist->more_errno |=
1420 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1425 sx->pending_BDAT = FALSE;
1426 pipelining_active = FALSE;
1428 else if (chunk_size > 0)
1429 sx->pending_BDAT = TRUE;
1432 sx->cmd_count = cmd_count;
1438 /*************************************************
1439 * Make connection for given message *
1440 *************************************************/
1444 ctx connection context
1445 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1446 a second attempt after TLS initialization fails
1448 Returns: OK - the connection was made and the delivery attempted;
1449 fd is set in the conn context, tls_out set up.
1450 DEFER - the connection could not be made, or something failed
1451 while setting up the SMTP session, or there was a
1452 non-message-specific error, such as a timeout.
1453 ERROR - helo_data or add_headers or authenticated_sender is
1454 specified for this transport, and the string failed
1458 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1460 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1461 dns_answer tlsa_dnsa;
1463 BOOL pass_message = FALSE;
1464 uschar * message = NULL;
1468 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1470 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1471 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1473 sx->send_rset = TRUE;
1474 sx->send_quit = TRUE;
1475 sx->setting_up = TRUE;
1477 sx->esmtp_sent = FALSE;
1479 sx->utf8_needed = FALSE;
1481 sx->dsn_all_lasthop = TRUE;
1482 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1484 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1487 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1488 sx->peer_offered = 0;
1489 sx->igquotstr = US"";
1490 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1491 #ifdef EXPERIMENTAL_DSN_INFO
1492 sx->smtp_greeting = NULL;
1493 sx->helo_response = NULL;
1496 smtp_command = US"initial connection";
1497 sx->buffer[0] = '\0';
1499 /* Set up the buffer for reading SMTP response packets. */
1501 sx->inblock.buffer = sx->inbuffer;
1502 sx->inblock.buffersize = sizeof(sx->inbuffer);
1503 sx->inblock.ptr = sx->inbuffer;
1504 sx->inblock.ptrend = sx->inbuffer;
1506 /* Set up the buffer for holding SMTP commands while pipelining */
1508 sx->outblock.buffer = sx->outbuffer;
1509 sx->outblock.buffersize = sizeof(sx->outbuffer);
1510 sx->outblock.ptr = sx->outbuffer;
1511 sx->outblock.cmd_count = 0;
1512 sx->outblock.authenticating = FALSE;
1514 /* Reset the parameters of a TLS session. */
1517 tls_out.cipher = NULL; /* the one we may use for this transport */
1518 tls_out.ourcert = NULL;
1519 tls_out.peercert = NULL;
1520 tls_out.peerdn = NULL;
1521 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1524 tls_out.ocsp = OCSP_NOT_REQ;
1526 /* Flip the legacy TLS-related variables over to the outbound set in case
1527 they're used in the context of the transport. Don't bother resetting
1528 afterward (when being used by a transport) as we're in a subprocess.
1529 For verify, unflipped once the callout is dealt with */
1531 tls_modify_variables(&tls_out);
1536 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1542 /* Make a connection to the host if this isn't a continued delivery, and handle
1543 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1544 specially so they can be identified for retries. */
1546 if (continue_hostname == NULL)
1549 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1551 /* This puts port into host->port */
1552 sx->inblock.sock = sx->outblock.sock =
1553 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1554 sx->ob->connect_timeout, sx->tblock);
1556 if (sx->inblock.sock < 0)
1558 uschar * msg = NULL;
1561 msg = US strerror(errno);
1562 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1564 set_errno_nohost(sx->addrlist,
1565 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1566 sx->verify ? string_sprintf("could not connect: %s", msg)
1569 sx->send_quit = FALSE;
1573 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1575 tls_out.dane_verified = FALSE;
1576 tls_out.tlsa_usage = 0;
1578 if (sx->host->dnssec == DS_YES)
1580 if( sx->dane_required
1581 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1583 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1585 case OK: sx->dane = TRUE; break;
1586 case FAIL_FORCED: break;
1587 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1588 string_sprintf("DANE error: tlsa lookup %s",
1589 rc == DEFER ? "DEFER" : "FAIL"),
1594 else if (sx->dane_required)
1596 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1597 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1603 sx->ob->tls_tempfail_tryclear = FALSE;
1607 /* Expand the greeting message while waiting for the initial response. (Makes
1608 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1609 delayed till here so that $sending_interface and $sending_port are set. */
1612 if (!(sx->helo_data = expand_string(sx->helo_data)))
1614 log_write(0, LOG_MAIN|LOG_PANIC,
1615 "<%s>: failed to expand transport's helo_data value for callout: %s",
1616 sx->addrlist->address, expand_string_message);
1621 expand_string_message = NULL;
1622 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1623 &expand_string_message)),
1624 expand_string_message)
1626 log_write(0, LOG_MAIN|LOG_PANIC,
1627 "<%s>: failed to expand transport's helo_data value for callout: %s",
1628 sx->addrlist->address, expand_string_message);
1630 sx->helo_data = NULL;
1634 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1635 is nevertheless a reasonably clean way of programming this kind of logic,
1636 where you want to escape on any error. */
1643 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1645 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1646 '2', sx->ob->command_timeout);
1647 #ifdef EXPERIMENTAL_DSN_INFO
1648 sx->smtp_greeting = string_copy(sx->buffer);
1650 if (!good_response) goto RESPONSE_FAILED;
1652 #ifndef DISABLE_EVENT
1655 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1656 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1657 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1660 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1661 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1669 /* Now check if the helo_data expansion went well, and sign off cleanly if
1674 message = string_sprintf("failed to expand helo_data: %s",
1675 expand_string_message);
1676 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1682 /** Debugging without sending a message
1683 sx->addrlist->transport_return = DEFER;
1687 /* Errors that occur after this point follow an SMTP command, which is
1688 left in big_buffer by smtp_write_command() for use in error messages. */
1690 smtp_command = big_buffer;
1692 /* Tell the remote who we are...
1694 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1695 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1696 greeting is of this form. The assumption was that the far end supports it
1697 properly... but experience shows that there are some that give 5xx responses,
1698 even though the banner includes "ESMTP" (there's a bloody-minded one that
1699 says "ESMTP not spoken here"). Cope with that case.
1701 September 2000: Time has passed, and it seems reasonable now to always send
1702 EHLO at the start. It is also convenient to make the change while installing
1705 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1706 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1707 would be no way to send out the mails, so there is now a host list
1708 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1709 PIPELINING problem as well. Maybe it can also be useful to cure other
1710 problems with broken servers.
1712 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1713 Then somebody tried it with a Microsoft mailer... It seems that all other
1714 mailers use upper case for some reason (the RFC is quite clear about case
1715 independence) so, for peace of mind, I gave in. */
1717 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1719 /* Alas; be careful, since this goto is not an error-out, so conceivably
1720 we might set data between here and the target which we assume to exist
1721 and be usable. I can see this coming back to bite us. */
1725 smtp_peer_options |= PEER_OFFERED_TLS;
1726 suppress_tls = FALSE;
1727 sx->ob->tls_tempfail_tryclear = FALSE;
1728 smtp_command = US"SSL-on-connect";
1735 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1736 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1738 sx->esmtp_sent = TRUE;
1739 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1740 sx->ob->command_timeout))
1742 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1744 #ifdef EXPERIMENTAL_DSN_INFO
1745 sx->helo_response = string_copy(sx->buffer);
1747 goto RESPONSE_FAILED;
1751 #ifdef EXPERIMENTAL_DSN_INFO
1752 sx->helo_response = string_copy(sx->buffer);
1757 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1762 int n = sizeof(sx->buffer);
1763 uschar * rsp = sx->buffer;
1765 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1766 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1768 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1770 good_response = smtp_read_response(&sx->inblock, rsp, n,
1771 '2', sx->ob->command_timeout);
1772 #ifdef EXPERIMENTAL_DSN_INFO
1773 sx->helo_response = string_copy(rsp);
1777 /* Handle special logging for a closed connection after HELO
1778 when had previously sent EHLO */
1780 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1782 errno = ERRNO_SMTPCLOSED;
1783 goto EHLOHELO_FAILED;
1785 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1786 goto RESPONSE_FAILED;
1790 sx->peer_offered = smtp_peer_options = 0;
1792 if (sx->esmtp || sx->lmtp)
1794 sx->peer_offered = ehlo_response(sx->buffer,
1795 PEER_OFFERED_TLS /* others checked later */
1798 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1801 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1806 /* For continuing deliveries down the same channel, having re-exec'd the socket
1807 is the standard input; for a socket held open from verify it is recorded
1808 in the cutthrough context block. Either way we don't need to redo EHLO here
1809 (but may need to do so for TLS - see below).
1810 Set up the pointer to where subsequent commands will be left, for
1811 error messages. Note that smtp_peer_options will have been
1812 set from the command line if they were set in the process that passed the
1815 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1816 as the continue goes via transport_pass_socket() and doublefork and exec.
1817 It does not wait. Unclear how we keep separate host's responses
1818 separate - we could match up by host ip+port as a bodge. */
1822 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1824 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1825 sx->host->port = sx->port = cutthrough.host.port;
1829 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1830 sx->host->port = sx->port; /* Record the port that was used */
1832 smtp_command = big_buffer;
1833 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1835 /* For a continued connection with TLS being proxied for us, or a
1836 held-open verify connection with TLS, nothing more to do. */
1838 if ( continue_proxy_cipher
1839 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1842 sx->peer_offered = smtp_peer_options;
1843 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1844 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1845 continue_proxy_cipher ? "proxied" : "verify conn with");
1848 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1851 /* If TLS is available on this connection, whether continued or not, attempt to
1852 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1853 send another EHLO - the server may give a different answer in secure mode. We
1854 use a separate buffer for reading the response to STARTTLS so that if it is
1855 negative, the original EHLO data is available for subsequent analysis, should
1856 the client not be required to use TLS. If the response is bad, copy the buffer
1857 for error analysis. */
1860 if ( smtp_peer_options & PEER_OFFERED_TLS
1862 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1864 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1867 uschar buffer2[4096];
1868 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1871 /* If there is an I/O error, transmission of this message is deferred. If
1872 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1873 false, we also defer. However, if there is a temporary rejection of STARTTLS
1874 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1875 STARTTLS, we carry on. This means we will try to send the message in clear,
1876 unless the host is in hosts_require_tls (tested below). */
1878 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1879 sx->ob->command_timeout))
1883 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1886 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1887 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1888 goto RESPONSE_FAILED;
1892 /* STARTTLS accepted: try to negotiate a TLS session. */
1897 address_item * addr;
1899 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1900 # ifdef EXPERIMENTAL_DANE
1901 sx->dane ? &tlsa_dnsa : NULL,
1905 /* TLS negotiation failed; give an error. From outside, this function may
1906 be called again to try in clear on a new connection, if the options permit
1907 it for this host. */
1911 # ifdef EXPERIMENTAL_DANE
1912 if (sx->dane) log_write(0, LOG_MAIN,
1913 "DANE attempt failed; TLS connection to %s [%s]: %s",
1914 sx->host->name, sx->host->address, errstr);
1917 errno = ERRNO_TLSFAILURE;
1918 message = string_sprintf("TLS session: %s", errstr);
1919 sx->send_quit = FALSE;
1923 /* TLS session is set up */
1925 smtp_peer_options_wrap = smtp_peer_options;
1926 for (addr = sx->addrlist; addr; addr = addr->next)
1927 if (addr->transport_return == PENDING_DEFER)
1929 addr->cipher = tls_out.cipher;
1930 addr->ourcert = tls_out.ourcert;
1931 addr->peercert = tls_out.peercert;
1932 addr->peerdn = tls_out.peerdn;
1933 addr->ocsp = tls_out.ocsp;
1938 /* if smtps, we'll have smtp_command set to something else; always safe to
1940 smtp_command = big_buffer;
1942 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1943 helo_data is null, we are dealing with a connection that was passed from
1944 another process, and so we won't have expanded helo_data above. We have to
1945 expand it here. $sending_ip_address and $sending_port are set up right at the
1946 start of the Exim process (in exim.c). */
1948 if (tls_out.active >= 0)
1953 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1955 uschar *message = string_sprintf("failed to expand helo_data: %s",
1956 expand_string_message);
1957 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1962 /* For SMTPS we need to wait for the initial OK response. */
1965 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1966 '2', sx->ob->command_timeout);
1967 #ifdef EXPERIMENTAL_DSN_INFO
1968 sx->smtp_greeting = string_copy(sx->buffer);
1970 if (!good_response) goto RESPONSE_FAILED;
1974 greeting_cmd = "EHLO";
1977 greeting_cmd = "HELO";
1979 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1982 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1983 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1985 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1986 '2', sx->ob->command_timeout);
1987 #ifdef EXPERIMENTAL_DSN_INFO
1988 sx->helo_response = string_copy(sx->buffer);
1990 if (!good_response) goto RESPONSE_FAILED;
1991 smtp_peer_options = 0;
1994 /* If the host is required to use a secure channel, ensure that we
1998 # ifdef EXPERIMENTAL_DANE
2001 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2004 errno = ERRNO_TLSREQUIRED;
2005 message = string_sprintf("a TLS session is required, but %s",
2006 smtp_peer_options & PEER_OFFERED_TLS
2007 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2010 #endif /*SUPPORT_TLS*/
2012 /* If TLS is active, we have just started it up and re-done the EHLO command,
2013 so its response needs to be analyzed. If TLS is not active and this is a
2014 continued session down a previously-used socket, we haven't just done EHLO, so
2017 if (continue_hostname == NULL
2019 || tls_out.active >= 0
2023 if (sx->esmtp || sx->lmtp)
2025 sx->peer_offered = ehlo_response(sx->buffer,
2027 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2028 | PEER_OFFERED_CHUNKING
2031 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2032 /*XXX if we hand peercaps on to continued-conn processes,
2033 must not depend on this addr */
2037 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2040 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2041 lmtp_ignore_quota option was set. */
2043 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2045 /* If the response to EHLO specified support for the SIZE parameter, note
2046 this, provided size_addition is non-negative. */
2048 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2050 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2051 the current host, esmtp will be false, so PIPELINING can never be used. If
2052 the current host matches hosts_avoid_pipelining, don't do it. */
2054 if ( sx->peer_offered & PEER_OFFERED_PIPE
2055 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2056 smtp_peer_options |= PEER_OFFERED_PIPE;
2058 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2059 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2061 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2062 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2063 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2065 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2066 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2068 #ifndef DISABLE_PRDR
2069 if ( sx->peer_offered & PEER_OFFERED_PRDR
2070 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2071 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2073 if (sx->peer_offered & PEER_OFFERED_PRDR)
2074 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2077 /* Note if the server supports DSN */
2078 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2079 DEBUG(D_transport) debug_printf("%susing DSN\n",
2080 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2082 /* Note if the response to EHLO specifies support for the AUTH extension.
2083 If it has, check that this host is one we want to authenticate to, and do
2084 the business. The host name and address must be available when the
2085 authenticator's client driver is running. */
2087 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2088 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2090 default: goto SEND_QUIT;
2092 case FAIL_SEND: goto SEND_FAILED;
2093 case FAIL: goto RESPONSE_FAILED;
2097 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2099 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2100 message-specific. */
2102 sx->setting_up = FALSE;
2105 if (sx->addrlist->prop.utf8_msg)
2107 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2108 && !sx->addrlist->prop.utf8_downcvt_maybe;
2109 DEBUG(D_transport) if (!sx->utf8_needed)
2110 debug_printf("utf8: %s downconvert\n",
2111 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2114 /* If this is an international message we need the host to speak SMTPUTF8 */
2115 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2117 errno = ERRNO_UTF8_FWD;
2118 goto RESPONSE_FAILED;
2130 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2131 sx->buffer, &code, &message, &pass_message);
2136 message = US string_sprintf("send() to %s [%s] failed: %s",
2137 sx->host->name, sx->host->address, strerror(errno));
2138 sx->send_quit = FALSE;
2141 /* This label is jumped to directly when a TLS negotiation has failed,
2142 or was not done for a host for which it is required. Values will be set
2143 in message and errno, and setting_up will always be true. Treat as
2144 a temporary error. */
2148 message = string_sprintf("Remote host closed connection in response to %s"
2149 " (EHLO response was: %s)", smtp_command, sx->buffer);
2150 sx->send_quit = FALSE;
2159 /* The failure happened while setting up the call; see if the failure was
2160 a 5xx response (this will either be on connection, or following HELO - a 5xx
2161 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2162 never going to accept them. For other errors during setting up (timeouts or
2163 whatever), defer all addresses, and yield DEFER, so that the host is not
2164 tried again for a while. */
2167 sx->ok = FALSE; /* For when reached by GOTO */
2171 || errno == ERRNO_UTF8_FWD
2175 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2176 #ifdef EXPERIMENTAL_DSN_INFO
2177 , sx->smtp_greeting, sx->helo_response
2186 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2189 tls_close(FALSE, TRUE);
2192 /* Close the socket, and return the appropriate value, first setting
2193 works because the NULL setting is passed back to the calling process, and
2194 remote_max_parallel is forced to 1 when delivering over an existing connection,
2196 If all went well and continue_more is set, we shouldn't actually get here if
2197 there are further addresses, as the return above will be taken. However,
2198 writing RSET might have failed, or there may be other addresses whose hosts are
2199 specified in the transports, and therefore not visible at top level, in which
2200 case continue_more won't get set. */
2202 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2205 shutdown(sx->outblock.sock, SHUT_WR);
2206 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2207 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2208 rc--; /* drain socket */
2209 sx->send_quit = FALSE;
2211 (void)close(sx->inblock.sock);
2212 sx->inblock.sock = sx->outblock.sock = -1;
2214 #ifndef DISABLE_EVENT
2215 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2218 continue_transport = NULL;
2219 continue_hostname = NULL;
2226 /* Create the string of options that will be appended to the MAIL FROM:
2227 in the connection context buffer */
2230 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2232 uschar * p = sx->buffer;
2233 address_item * addr;
2238 /* If we know the receiving MTA supports the SIZE qualification,
2239 send it, adding something to the message size to allow for imprecision
2240 and things that get added en route. Exim keeps the number of lines
2241 in a message, so we can give an accurate value for the original message, but we
2242 need some additional to handle added headers. (Double "." characters don't get
2243 included in the count.) */
2245 if (sx->peer_offered & PEER_OFFERED_SIZE)
2247 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2251 #ifndef DISABLE_PRDR
2252 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2255 sx->prdr_active = FALSE;
2256 if (sx->peer_offered & PEER_OFFERED_PRDR)
2257 for (addr = addrlist; addr; addr = addr->next)
2258 if (addr->transport_return == PENDING_DEFER)
2260 for (addr = addr->next; addr; addr = addr->next)
2261 if (addr->transport_return == PENDING_DEFER)
2262 { /* at least two recipients to send */
2263 sx->prdr_active = TRUE;
2264 sprintf(CS p, " PRDR"); p += 5;
2272 /* If it supports internationalised messages, and this meesage need that,
2275 if ( sx->peer_offered & PEER_OFFERED_UTF8
2276 && addrlist->prop.utf8_msg
2277 && !addrlist->prop.utf8_downcvt
2279 Ustrcpy(p, " SMTPUTF8"), p += 9;
2282 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2283 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2284 addr && address_count < sx->max_rcpt;
2285 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2288 if (!(addr->dsn_flags & rf_dsnlasthop))
2290 sx->dsn_all_lasthop = FALSE;
2295 /* Add any DSN flags to the mail command */
2297 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2299 if (dsn_ret == dsn_ret_hdrs)
2300 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2301 else if (dsn_ret == dsn_ret_full)
2302 { Ustrcpy(p, " RET=FULL"); p += 9; }
2306 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2311 /* If an authenticated_sender override has been specified for this transport
2312 instance, expand it. If the expansion is forced to fail, and there was already
2313 an authenticated_sender for this message, the original value will be used.
2314 Other expansion failures are serious. An empty result is ignored, but there is
2315 otherwise no check - this feature is expected to be used with LMTP and other
2316 cases where non-standard addresses (e.g. without domains) might be required. */
2318 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2326 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2328 uschar * p = sx->buffer;
2331 /* Add any DSN flags to the rcpt command */
2333 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2335 if (addr->dsn_flags & rf_dsnflags)
2340 Ustrcpy(p, " NOTIFY=");
2342 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2344 if (!first) *p++ = ',';
2346 Ustrcpy(p, rf_names[i]);
2351 if (addr->dsn_orcpt)
2353 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2364 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2365 -1 MAIL response error
2366 -2 any non-MAIL read i/o error
2367 -3 non-MAIL response timeout
2368 -4 internal error; channel still usable
2373 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2375 address_item * addr;
2379 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2385 /* From here until we send the DATA command, we can make use of PIPELINING
2386 if the server host supports it. The code has to be able to check the responses
2387 at any point, for when the buffer fills up, so we write it totally generally.
2388 When PIPELINING is off, each command written reports that it has flushed the
2391 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2394 uschar * s = sx->from_addr;
2396 uschar * errstr = NULL;
2398 /* If we must downconvert, do the from-address here. Remember we had to
2399 for the to-addresses (done below), and also (ugly) for re-doing when building
2400 the delivery log line. */
2402 if ( sx->addrlist->prop.utf8_msg
2403 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2406 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2408 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2412 setflag(sx->addrlist, af_utf8_downcvt);
2416 rc = smtp_write_command(&sx->outblock, pipelining_active,
2417 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2420 mail_command = string_copy(big_buffer); /* Save for later error message */
2424 case -1: /* Transmission error */
2427 case +1: /* Cmd was sent */
2428 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2429 sx->ob->command_timeout))
2431 if (errno == 0 && sx->buffer[0] == '4')
2433 errno = ERRNO_MAIL4XX;
2434 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2438 sx->pending_MAIL = FALSE;
2441 /* otherwise zero: command queued for pipeline */
2444 /* Pass over all the relevant recipient addresses for this host, which are the
2445 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2446 several before we have to read the responses for those seen so far. This
2447 checking is done by a subroutine because it also needs to be done at the end.
2448 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2449 the next one if not all are sent.
2451 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2452 last address because we want to abort if any recipients have any kind of
2453 problem, temporary or permanent. We know that all recipient addresses will have
2454 the PENDING_DEFER status, because only one attempt is ever made, and we know
2455 that max_rcpt will be large, so all addresses will be done at once.
2457 For verify we flush the pipeline after any (the only) rcpt address. */
2459 for (addr = sx->first_addr, address_count = 0;
2460 addr && address_count < sx->max_rcpt;
2461 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2467 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2468 ? dsn_support_yes : dsn_support_no;
2471 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
2473 build_rcptcmd_options(sx, addr);
2475 /* Now send the RCPT command, and process outstanding responses when
2476 necessary. After a timeout on RCPT, we just end the function, leaving the
2477 yield as OK, because this error can often mean that there is a problem with
2478 just one address, so we don't want to delay the host. */
2480 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2483 if ( testflag(sx->addrlist, af_utf8_downcvt)
2484 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2487 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2488 errno = ERRNO_EXPANDFAIL;
2489 return -5; /*XXX too harsh? */
2493 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2494 rcpt_addr, sx->igquotstr, sx->buffer);
2496 if (count < 0) return -5;
2499 switch(sync_responses(sx, count, 0))
2501 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2502 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2505 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2506 if (!sx->lmtp) /* can't tell about progress yet */
2507 sx->completed_addr = TRUE;
2508 case 0: /* No 2xx or 5xx, but no probs */
2511 case -1: return -3; /* Timeout on RCPT */
2512 case -2: return -2; /* non-MAIL read i/o error */
2513 default: return -1; /* any MAIL error */
2515 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2517 } /* Loop for next address */
2519 sx->next_addr = addr;
2525 /*****************************************************
2526 * Proxy TLS connection for another transport process *
2527 ******************************************************/
2529 Use the given buffer as a staging area, and select on both the given fd
2530 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2531 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2535 buf space to use for buffering
2536 bufsiz size of buffer
2537 proxy_fd comms to proxied process
2538 timeout per-read timeout, seconds
2542 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2545 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2546 int rc, i, fd_bits, nbytes;
2548 set_process_info("proxying TLS connection for continued transport");
2550 FD_SET(tls_out.active, &fds);
2551 FD_SET(proxy_fd, &fds);
2553 for (fd_bits = 3; fd_bits; )
2555 time_t time_left = timeout;
2556 time_t time_start = time(NULL);
2561 struct timeval tv = { time_left, 0 };
2563 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2565 if (rc < 0 && errno == EINTR)
2566 if ((time_left -= time(NULL) - time_start) > 0) continue;
2570 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2574 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2576 /* handle inbound data */
2577 if (FD_ISSET(tls_out.active, &fds))
2578 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2581 FD_CLR(tls_out.active, &fds);
2582 shutdown(proxy_fd, SHUT_WR);
2586 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2587 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2589 else if (fd_bits & 1)
2590 FD_SET(tls_out.active, &fds);
2592 /* handle outbound data */
2593 if (FD_ISSET(proxy_fd, &fds))
2594 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2597 FD_CLR(proxy_fd, &fds);
2598 shutdown(tls_out.active, SHUT_WR);
2602 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2603 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2605 else if (fd_bits & 2)
2606 FD_SET(proxy_fd, &fds);
2612 /*************************************************
2613 * Deliver address list to given host *
2614 *************************************************/
2616 /* If continue_hostname is not null, we get here only when continuing to
2617 deliver down an existing channel. The channel was passed as the standard
2618 input. TLS is never active on a passed channel; the previous process always
2619 closes it down before passing the connection on.
2621 Otherwise, we have to make a connection to the remote host, and do the
2622 initial protocol exchange.
2624 When running as an MUA wrapper, if the sender or any recipient is rejected,
2625 temporarily or permanently, we force failure for all recipients.
2628 addrlist chain of potential addresses to deliver; only those whose
2629 transport_return field is set to PENDING_DEFER are currently
2630 being processed; others should be skipped - they have either
2631 been delivered to an earlier host or IP address, or been
2632 failed by one of them.
2633 host host to deliver to
2634 host_af AF_INET or AF_INET6
2635 port default TCP/IP port to use, in host byte order
2636 interface interface to bind to, or NULL
2637 tblock transport instance block
2638 message_defer set TRUE if yield is OK, but all addresses were deferred
2639 because of a non-recipient, non-host failure, that is, a
2640 4xx response to MAIL FROM, DATA, or ".". This is a defer
2641 that is specific to the message.
2642 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2643 a second attempt after TLS initialization fails
2645 Returns: OK - the connection was made and the delivery attempted;
2646 the result for each address is in its data block.
2647 DEFER - the connection could not be made, or something failed
2648 while setting up the SMTP session, or there was a
2649 non-message-specific error, such as a timeout.
2650 ERROR - a filter command is specified for this transport,
2651 and there was a problem setting it up; OR helo_data
2652 or add_headers or authenticated_sender is specified
2653 for this transport, and the string failed to expand
2657 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2658 uschar *interface, transport_instance *tblock,
2659 BOOL *message_defer, BOOL suppress_tls)
2665 time_t start_delivery_time = time(NULL);
2667 BOOL pass_message = FALSE;
2668 uschar *message = NULL;
2669 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2674 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2675 *message_defer = FALSE;
2677 sx.addrlist = addrlist;
2679 sx.host_af = host_af,
2681 sx.interface = interface;
2682 sx.helo_data = NULL;
2686 /* Get the channel set up ready for a message (MAIL FROM being the next
2687 SMTP command to send */
2689 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2692 /* If there is a filter command specified for this transport, we can now
2693 set it up. This cannot be done until the identify of the host is known. */
2695 if (tblock->filter_command)
2699 sprintf(CS fbuf, "%.50s transport", tblock->name);
2700 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2701 TRUE, DEFER, addrlist, fbuf, NULL);
2702 transport_filter_timeout = tblock->filter_timeout;
2704 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2709 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2715 if ( transport_filter_argv
2716 && *transport_filter_argv
2717 && **transport_filter_argv
2718 && sx.peer_offered & PEER_OFFERED_CHUNKING
2721 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2722 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2727 /* For messages that have more than the maximum number of envelope recipients,
2728 we want to send several transactions down the same SMTP connection. (See
2729 comments in deliver.c as to how this reconciles, heuristically, with
2730 remote_max_parallel.) This optimization was added to Exim after the following
2731 code was already working. The simplest way to put it in without disturbing the
2732 code was to use a goto to jump back to this point when there is another
2733 transaction to handle. */
2736 sx.from_addr = return_path;
2737 sx.first_addr = sx.sync_addr = addrlist;
2739 sx.send_rset = TRUE;
2740 sx.completed_addr = FALSE;
2743 /* If we are a continued-connection-after-verify the MAIL and RCPT
2744 commands were already sent; do not re-send but do mark the addrs as
2745 having been accepted up to RCPT stage. A traditional cont-conn
2746 always has a sequence number greater than one. */
2748 if (continue_hostname && continue_sequence == 1)
2750 address_item * addr;
2752 sx.peer_offered = smtp_peer_options;
2754 sx.next_addr = NULL;
2756 for (addr = addrlist; addr; addr = addr->next)
2757 addr->transport_return = PENDING_OK;
2761 /* Initiate a message transfer. */
2763 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2766 case -1: case -2: goto RESPONSE_FAILED;
2767 case -3: goto END_OFF;
2768 case -4: goto SEND_QUIT;
2769 default: goto SEND_FAILED;
2772 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2773 permanently or temporarily. We should have flushed and synced after the last
2778 address_item *badaddr;
2779 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2780 if (badaddr->transport_return != PENDING_OK)
2782 /*XXX could we find a better errno than 0 here? */
2783 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2784 testflag(badaddr, af_pass_message));
2791 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2792 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2793 have a good recipient buffered up if we are pipelining. We don't want to waste
2794 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2795 are pipelining. The responses are all handled by sync_responses().
2796 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2799 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2800 && (sx.ok || (pipelining_active && !mua_wrapper)))
2802 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2804 if (count < 0) goto SEND_FAILED;
2805 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2807 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2808 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2811 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2812 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2813 case 0: break; /* No 2xx or 5xx, but no probs */
2815 case -1: goto END_OFF; /* Timeout on RCPT */
2816 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2818 pipelining_active = FALSE;
2819 data_command = string_copy(big_buffer); /* Save for later error message */
2822 /* If there were no good recipients (but otherwise there have been no
2823 problems), just set ok TRUE, since we have handled address-specific errors
2824 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2825 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2826 well as body. Set the appropriate timeout value to be used for each chunk.
2827 (Haven't been able to make it work using select() for writing yet.) */
2829 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2831 /* Save the first address of the next batch. */
2832 sx.first_addr = sx.next_addr;
2838 transport_ctx tctx = {
2841 US".", US"..", /* Escaping strings */
2842 topt_use_crlf | topt_escape_headers
2843 | (tblock->body_only ? topt_no_headers : 0)
2844 | (tblock->headers_only ? topt_no_body : 0)
2845 | (tblock->return_path_add ? topt_add_return_path : 0)
2846 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2847 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2850 /* If using CHUNKING we need a callback from the generic transport
2851 support to us, for the sending of BDAT smtp commands and the reaping
2852 of responses. The callback needs a whole bunch of state so set up
2853 a transport-context structure to be passed around. */
2855 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2857 tctx.check_string = tctx.escape_string = NULL;
2858 tctx.options |= topt_use_bdat;
2859 tctx.chunk_cb = smtp_chunk_cmd_callback;
2860 sx.pending_BDAT = FALSE;
2861 sx.good_RCPT = sx.ok;
2863 tctx.smtp_context = &sx;
2866 tctx.options |= topt_end_dot;
2868 /* Save the first address of the next batch. */
2869 sx.first_addr = sx.next_addr;
2871 /* Responses from CHUNKING commands go in buffer. Otherwise,
2872 there has not been a response. */
2876 sigalrm_seen = FALSE;
2877 transport_write_timeout = sx.ob->data_timeout;
2878 smtp_command = US"sending data block"; /* For error messages */
2879 DEBUG(D_transport|D_v)
2880 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2881 debug_printf(" will write message using CHUNKING\n");
2883 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2884 transport_count = 0;
2886 #ifndef DISABLE_DKIM
2887 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim,
2890 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2893 /* transport_write_message() uses write() because it is called from other
2894 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2895 it can exit with "Broken pipe" as its error. This really means that the
2896 socket got closed at the far end. */
2898 transport_write_timeout = 0; /* for subsequent transports */
2900 /* Failure can either be some kind of I/O disaster (including timeout),
2901 or the failure of a transport filter or the expansion of added headers.
2902 Or, when CHUNKING, it can be a protocol-detected failure. */
2905 if (message) goto SEND_FAILED;
2906 else goto RESPONSE_FAILED;
2908 /* We used to send the terminating "." explicitly here, but because of
2909 buffering effects at both ends of TCP/IP connections, you don't gain
2910 anything by keeping it separate, so it might as well go in the final
2911 data buffer for efficiency. This is now done by setting the topt_end_dot
2914 smtp_command = US"end of data";
2916 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2918 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2919 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2921 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2922 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2925 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2926 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2927 case 0: break; /* No 2xx or 5xx, but no probs */
2929 case -1: goto END_OFF; /* Timeout on RCPT */
2930 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2934 #ifndef DISABLE_PRDR
2935 /* For PRDR we optionally get a partial-responses warning
2936 * followed by the individual responses, before going on with
2937 * the overall response. If we don't get the warning then deal
2938 * with per non-PRDR. */
2941 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2942 sx.ob->final_timeout);
2943 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2945 case '2': sx.prdr_active = FALSE;
2948 case '4': errno = ERRNO_DATA4XX;
2949 addrlist->more_errno |=
2950 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2957 /* For non-PRDR SMTP, we now read a single response that applies to the
2958 whole message. If it is OK, then all the addresses have been delivered. */
2962 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2963 sx.ob->final_timeout);
2964 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2966 errno = ERRNO_DATA4XX;
2967 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2971 /* For LMTP, we get back a response for every RCPT command that we sent;
2972 some may be accepted and some rejected. For those that get a response, their
2973 status is fixed; any that are accepted have been handed over, even if later
2974 responses crash - at least, that's how I read RFC 2033.
2976 If all went well, mark the recipient addresses as completed, record which
2977 host/IPaddress they were delivered to, and cut out RSET when sending another
2978 message down the same channel. Write the completed addresses to the journal
2979 now so that they are recorded in case there is a crash of hardware or
2980 software before the spool gets updated. Also record the final SMTP
2981 confirmation if needed (for SMTP only). */
2986 int delivery_time = (int)(time(NULL) - start_delivery_time);
2988 uschar *conf = NULL;
2990 sx.send_rset = FALSE;
2991 pipelining_active = FALSE;
2993 /* Set up confirmation if needed - applies only to SMTP */
2996 #ifdef DISABLE_EVENT
2997 LOGGING(smtp_confirmation) &&
3002 const uschar *s = string_printing(sx.buffer);
3003 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3004 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3007 /* Process all transported addresses - for LMTP or PRDR, read a status for
3010 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3012 if (addr->transport_return != PENDING_OK) continue;
3014 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3015 remaining addresses. Otherwise, it's a return code for just the one
3016 address. For temporary errors, add a retry item for the address so that
3017 it doesn't get tried again too soon. */
3019 #ifndef DISABLE_PRDR
3020 if (sx.lmtp || sx.prdr_active)
3025 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3026 sx.ob->final_timeout))
3028 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3029 addr->message = string_sprintf(
3030 #ifndef DISABLE_PRDR
3031 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3033 "LMTP error after %s: %s",
3035 data_command, string_printing(sx.buffer));
3036 setflag(addr, af_pass_message); /* Allow message to go to user */
3037 if (sx.buffer[0] == '5')
3038 addr->transport_return = FAIL;
3041 errno = ERRNO_DATA4XX;
3042 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3043 addr->transport_return = DEFER;
3044 #ifndef DISABLE_PRDR
3045 if (!sx.prdr_active)
3047 retry_add_item(addr, addr->address_retry_key, 0);
3051 sx.completed_addr = TRUE; /* NOW we can set this flag */
3052 if (LOGGING(smtp_confirmation))
3054 const uschar *s = string_printing(sx.buffer);
3055 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3056 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3060 /* SMTP, or success return from LMTP for this address. Pass back the
3061 actual host that was used. */
3063 addr->transport_return = OK;
3064 addr->more_errno = delivery_time;
3065 addr->host_used = host;
3066 addr->special_action = flag;
3067 addr->message = conf;
3068 #ifndef DISABLE_PRDR
3069 if (sx.prdr_active) addr->flags |= af_prdr_used;
3071 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3074 #ifndef DISABLE_PRDR
3075 if (!sx.prdr_active)
3078 /* Update the journal. For homonymic addresses, use the base address plus
3079 the transport name. See lots of comments in deliver.c about the reasons
3080 for the complications when homonyms are involved. Just carry on after
3081 write error, as it may prove possible to update the spool file later. */
3083 if (testflag(addr, af_homonym))
3084 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3086 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3088 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3089 len = Ustrlen(CS sx.buffer);
3090 if (write(journal_fd, sx.buffer, len) != len)
3091 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3092 "%s: %s", sx.buffer, strerror(errno));
3096 #ifndef DISABLE_PRDR
3099 /* PRDR - get the final, overall response. For any non-success
3100 upgrade all the address statuses. */
3101 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3102 sx.ob->final_timeout);
3105 if(errno == 0 && sx.buffer[0] == '4')
3107 errno = ERRNO_DATA4XX;
3108 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3110 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3111 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3112 addr->transport_return = PENDING_OK; /* allow set_errno action */
3113 goto RESPONSE_FAILED;
3116 /* Update the journal, or setup retry. */
3117 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3118 if (addr->transport_return == OK)
3120 if (testflag(addr, af_homonym))
3121 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3123 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3125 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3126 len = Ustrlen(CS sx.buffer);
3127 if (write(journal_fd, sx.buffer, len) != len)
3128 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3129 "%s: %s", sx.buffer, strerror(errno));
3131 else if (addr->transport_return == DEFER)
3132 retry_add_item(addr, addr->address_retry_key, -2);
3136 /* Ensure the journal file is pushed out to disk. */
3138 if (EXIMfsync(journal_fd) < 0)
3139 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3145 /* Handle general (not specific to one address) failures here. The value of ok
3146 is used to skip over this code on the falling through case. A timeout causes a
3147 deferral. Other errors may defer or fail according to the response code, and
3148 may set up a special errno value, e.g. after connection chopped, which is
3149 assumed if errno == 0 and there is no text in the buffer. If control reaches
3150 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3151 the problem is not related to this specific message. */
3156 uschar * set_message;
3162 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3163 sx.buffer, &code, &message, &pass_message);
3171 message = string_sprintf("send() to %s [%s] failed: %s",
3172 host->name, host->address, message ? message : US strerror(save_errno));
3173 sx.send_quit = FALSE;
3181 sx.ok = FALSE; /* For when reached by GOTO */
3182 set_message = message;
3184 /* We want to handle timeouts after MAIL or "." and loss of connection after
3185 "." specially. They can indicate a problem with the sender address or with
3186 the contents of the message rather than a real error on the connection. These
3187 cases are treated in the same way as a 4xx response. This next bit of code
3188 does the classification. */
3195 message_error = TRUE;
3199 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3200 Ustrncmp(smtp_command,"end ",4) == 0;
3203 case ERRNO_SMTPCLOSED:
3204 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3208 message_error = FALSE;
3212 /* Handle the cases that are treated as message errors. These are:
3214 (a) negative response or timeout after MAIL
3215 (b) negative response after DATA
3216 (c) negative response or timeout or dropped connection after "."
3217 (d) utf8 support required and not offered
3219 It won't be a negative response or timeout after RCPT, as that is dealt
3220 with separately above. The action in all cases is to set an appropriate
3221 error code for all the addresses, but to leave yield set to OK because the
3222 host itself has not failed. Of course, it might in practice have failed
3223 when we've had a timeout, but if so, we'll discover that at the next
3224 delivery attempt. For a temporary error, set the message_defer flag, and
3225 write to the logs for information if this is not the last host. The error
3226 for the last host will be logged as part of the address's log line. */
3230 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3232 /* If there's an errno, the message contains just the identity of
3237 else /* Anything other than 5 is treated as temporary */
3241 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3242 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3243 msglog_line(host, message);
3244 *message_defer = TRUE;
3248 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3249 ".", or some other transportation error. We defer all addresses and yield
3250 DEFER, except for the case of failed add_headers expansion, or a transport
3251 filter failure, when the yield should be ERROR, to stop it trying other
3257 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3258 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3262 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3263 #ifdef EXPERIMENTAL_DSN_INFO
3264 , sx.smtp_greeting, sx.helo_response
3270 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3271 SMTP session tidily. However, if there were too many addresses to send in one
3272 message (indicated by first_addr being non-NULL) we want to carry on with the
3273 rest of them. Also, it is desirable to send more than one message down the SMTP
3274 connection if there are several waiting, provided we haven't already sent so
3275 many as to hit the configured limit. The function transport_check_waiting looks
3276 for a waiting message and returns its id. Then transport_pass_socket tries to
3277 set up a continued delivery by passing the socket on to another process. The
3278 variable send_rset is FALSE if a message has just been successfully transfered.
3280 If we are already sending down a continued channel, there may be further
3281 addresses not yet delivered that are aimed at the same host, but which have not
3282 been passed in this run of the transport. In this case, continue_more will be
3283 true, and all we should do is send RSET if necessary, and return, leaving the
3286 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3287 do not want to continue with other messages down the same channel, because that
3288 can lead to looping between two or more messages, all with the same,
3289 temporarily failing address(es). [The retry information isn't updated yet, so
3290 new processes keep on trying.] We probably also don't want to try more of this
3291 message's addresses either.
3293 If we have started a TLS session, we have to end it before passing the
3294 connection to a new process. However, not all servers can handle this (Exim
3295 can), so we do not pass such a connection on if the host matches
3296 hosts_nopass_tls. */
3299 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3300 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3301 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3303 if (sx.completed_addr && sx.ok && sx.send_quit)
3306 smtp_compare_t t_compare;
3308 t_compare.tblock = tblock;
3309 t_compare.current_sender_address = sender_address;
3311 if ( sx.first_addr != NULL
3315 ( tls_out.active < 0 && !continue_proxy_cipher
3316 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3320 transport_check_waiting(tblock->name, host->name,
3321 tblock->connection_max_messages, new_message_id, &more,
3322 (oicf)smtp_are_same_identities, (void*)&t_compare)
3329 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3331 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3332 host->address, strerror(errno));
3333 sx.send_quit = FALSE;
3335 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3336 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3339 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3343 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3344 host->name, host->address, msg);
3348 /* Either RSET was not needed, or it succeeded */
3353 int socket_fd = sx.inblock.sock;
3356 if (sx.first_addr != NULL) /* More addresses still to be sent */
3357 { /* in this run of the transport */
3358 continue_sequence++; /* Causes * in logging */
3361 if (continue_more) return yield; /* More addresses for another run */
3363 /* Pass the connection on to a new Exim process. */
3365 if (tls_out.active >= 0)
3366 if (verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3368 /* Pass the socket, for direct use, to a new Exim process. Before
3369 doing so, we must shut down TLS. Not all MTAs allow for the
3370 continuation of the SMTP session when TLS is shut down. We test for
3371 this by sending a new EHLO. If we don't get a good response, we don't
3372 attempt to pass the socket on. */
3374 tls_close(FALSE, TRUE);
3375 smtp_peer_options = smtp_peer_options_wrap;
3377 && smtp_write_command(&sx.outblock, FALSE,
3378 "EHLO %s\r\n", sx.helo_data) >= 0
3379 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3380 '2', sx.ob->command_timeout);
3384 /* Set up a pipe for proxying TLS for the new transport process */
3386 smtp_peer_options |= PEER_OFFERED_TLS;
3387 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3390 set_errno(sx.first_addr, errno, US"internal allocation problem",
3392 # ifdef EXPERIMENTAL_DSN_INFO
3393 , sx.smtp_greeting, sx.helo_response
3399 /* If the socket is successfully passed, we mustn't send QUIT (or
3400 indeed anything!) from here. */
3402 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3403 propagate it from the initial
3405 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3406 host->address, new_message_id, socket_fd))
3408 sx.send_quit = FALSE;
3410 /* If TLS is still active, we need to proxy it for the transport we
3411 just passed the baton to. Fork a child to to do it, and return to
3412 get logging done asap. Which way to place the work makes assumptions
3413 about post-fork prioritisation which may not hold on all platforms. */
3415 if (tls_out.active >= 0)
3418 if (pid > 0) /* parent */
3420 tls_close(FALSE, FALSE);
3421 (void)close(sx.inblock.sock);
3422 continue_transport = NULL;
3423 continue_hostname = NULL;
3426 else if (pid == 0) /* child */
3428 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3436 /* If RSET failed and there are addresses left, they get deferred. */
3438 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3439 #ifdef EXPERIMENTAL_DSN_INFO
3440 , sx.smtp_greeting, sx.helo_response
3446 /* End off tidily with QUIT unless the connection has died or the socket has
3447 been passed to another process. There has been discussion on the net about what
3448 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3449 to wait for a response, but on the other hand, there isn't anything one can do
3450 with an error response, other than log it. Exim used to do that. However,
3451 further discussion suggested that it is positively advantageous not to wait for
3452 the response, but to close the session immediately. This is supposed to move
3453 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3454 load from the server. (Hosts that are both servers and clients may not see much
3455 difference, of course.) Further discussion indicated that this was safe to do
3456 on Unix systems which have decent implementations of TCP/IP that leave the
3457 connection around for a while (TIME_WAIT) after the application has gone away.
3458 This enables the response sent by the server to be properly ACKed rather than
3459 timed out, as can happen on broken TCP/IP implementations on other OS.
3461 This change is being made on 31-Jul-98. After over a year of trouble-free
3462 operation, the old commented-out code was removed on 17-Sep-99. */
3465 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3470 tls_close(FALSE, TRUE);
3473 /* Close the socket, and return the appropriate value, first setting
3474 works because the NULL setting is passed back to the calling process, and
3475 remote_max_parallel is forced to 1 when delivering over an existing connection,
3477 If all went well and continue_more is set, we shouldn't actually get here if
3478 there are further addresses, as the return above will be taken. However,
3479 writing RSET might have failed, or there may be other addresses whose hosts are
3480 specified in the transports, and therefore not visible at top level, in which
3481 case continue_more won't get set. */
3483 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3486 shutdown(sx.outblock.sock, SHUT_WR);
3487 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3488 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3489 rc--; /* drain socket */
3491 (void)close(sx.inblock.sock);
3493 #ifndef DISABLE_EVENT
3494 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3497 continue_transport = NULL;
3498 continue_hostname = NULL;
3505 /*************************************************
3506 * Closedown entry point *
3507 *************************************************/
3509 /* This function is called when exim is passed an open smtp channel
3510 from another incarnation, but the message which it has been asked
3511 to deliver no longer exists. The channel is on stdin.
3513 We might do fancy things like looking for another message to send down
3514 the channel, but if the one we sought has gone, it has probably been
3515 delivered by some other process that itself will seek further messages,
3516 so just close down our connection.
3518 Argument: pointer to the transport instance block
3523 smtp_transport_closedown(transport_instance *tblock)
3525 smtp_transport_options_block *ob =
3526 (smtp_transport_options_block *)tblock->options_block;
3527 smtp_inblock inblock;
3528 smtp_outblock outblock;
3530 uschar inbuffer[4096];
3531 uschar outbuffer[16];
3533 inblock.sock = fileno(stdin);
3534 inblock.buffer = inbuffer;
3535 inblock.buffersize = sizeof(inbuffer);
3536 inblock.ptr = inbuffer;
3537 inblock.ptrend = inbuffer;
3539 outblock.sock = inblock.sock;
3540 outblock.buffersize = sizeof(outbuffer);
3541 outblock.buffer = outbuffer;
3542 outblock.ptr = outbuffer;
3543 outblock.cmd_count = 0;
3544 outblock.authenticating = FALSE;
3546 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3547 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3548 ob->command_timeout);
3549 (void)close(inblock.sock);
3554 /*************************************************
3555 * Prepare addresses for delivery *
3556 *************************************************/
3558 /* This function is called to flush out error settings from previous delivery
3559 attempts to other hosts. It also records whether we got here via an MX record
3560 or not in the more_errno field of the address. We are interested only in
3561 addresses that are still marked DEFER - others may have got delivered to a
3562 previously considered IP address. Set their status to PENDING_DEFER to indicate
3563 which ones are relevant this time.
3566 addrlist the list of addresses
3567 host the host we are delivering to
3569 Returns: the first address for this delivery
3572 static address_item *
3573 prepare_addresses(address_item *addrlist, host_item *host)
3575 address_item *first_addr = NULL;
3577 for (addr = addrlist; addr; addr = addr->next)
3578 if (addr->transport_return == DEFER)
3580 if (!first_addr) first_addr = addr;
3581 addr->transport_return = PENDING_DEFER;
3582 addr->basic_errno = 0;
3583 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3584 addr->message = NULL;
3586 addr->cipher = NULL;
3587 addr->ourcert = NULL;
3588 addr->peercert = NULL;
3589 addr->peerdn = NULL;
3590 addr->ocsp = OCSP_NOT_REQ;
3592 #ifdef EXPERIMENTAL_DSN_INFO
3593 addr->smtp_greeting = NULL;
3594 addr->helo_response = NULL;
3602 /*************************************************
3603 * Main entry point *
3604 *************************************************/
3606 /* See local README for interface details. As this is a remote transport, it is
3607 given a chain of addresses to be delivered in one connection, if possible. It
3608 always returns TRUE, indicating that each address has its own independent
3609 status set, except if there is a setting up problem, in which case it returns
3613 smtp_transport_entry(
3614 transport_instance *tblock, /* data for this instantiation */
3615 address_item *addrlist) /* addresses we are working on */
3619 int hosts_defer = 0;
3621 int hosts_looked_up = 0;
3622 int hosts_retry = 0;
3623 int hosts_serial = 0;
3624 int hosts_total = 0;
3625 int total_hosts_tried = 0;
3627 BOOL expired = TRUE;
3628 uschar *expanded_hosts = NULL;
3630 uschar *tid = string_sprintf("%s transport", tblock->name);
3631 smtp_transport_options_block *ob =
3632 (smtp_transport_options_block *)(tblock->options_block);
3633 host_item *hostlist = addrlist->host_list;
3634 host_item *host = NULL;
3638 debug_printf("%s transport entered\n", tblock->name);
3639 for (addr = addrlist; addr; addr = addr->next)
3640 debug_printf(" %s\n", addr->address);
3643 debug_printf("hostlist:\n");
3644 for (host = hostlist; host; host = host->next)
3645 debug_printf(" %s:%d\n", host->name, host->port);
3647 if (continue_hostname)
3648 debug_printf("already connected to %s [%s] (on fd %d)\n",
3649 continue_hostname, continue_host_address,
3650 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3653 /* Set the flag requesting that these hosts be added to the waiting
3654 database if the delivery fails temporarily or if we are running with
3655 queue_smtp or a 2-stage queue run. This gets unset for certain
3656 kinds of error, typically those that are specific to the message. */
3658 update_waiting = TRUE;
3660 /* If a host list is not defined for the addresses - they must all have the
3661 same one in order to be passed to a single transport - or if the transport has
3662 a host list with hosts_override set, use the host list supplied with the
3663 transport. It is an error for this not to exist. */
3665 if (!hostlist || (ob->hosts_override && ob->hosts))
3669 addrlist->message = string_sprintf("%s transport called with no hosts set",
3671 addrlist->transport_return = PANIC;
3672 return FALSE; /* Only top address has status */
3675 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3678 /* If the transport's host list contains no '$' characters, and we are not
3679 randomizing, it is fixed and therefore a chain of hosts can be built once
3680 and for all, and remembered for subsequent use by other calls to this
3681 transport. If, on the other hand, the host list does contain '$', or we are
3682 randomizing its order, we have to rebuild it each time. In the fixed case,
3683 as the hosts string will never be used again, it doesn't matter that we
3684 replace all the : characters with zeros. */
3688 uschar *s = ob->hosts;
3690 if (Ustrchr(s, '$') != NULL)
3692 if (!(expanded_hosts = expand_string(s)))
3694 addrlist->message = string_sprintf("failed to expand list of hosts "
3695 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3696 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3697 return FALSE; /* Only top address has status */
3699 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3700 "\"%s\"\n", s, expanded_hosts);
3704 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3706 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3708 /* Check that the expansion yielded something useful. */
3712 string_sprintf("%s transport has empty hosts setting", tblock->name);
3713 addrlist->transport_return = PANIC;
3714 return FALSE; /* Only top address has status */
3717 /* If there was no expansion of hosts, save the host list for
3720 if (!expanded_hosts) ob->hostlist = hostlist;
3723 /* This is not the first time this transport has been run in this delivery;
3724 the host list was built previously. */
3727 hostlist = ob->hostlist;
3730 /* The host list was supplied with the address. If hosts_randomize is set, we
3731 must sort it into a random order if it did not come from MX records and has not
3732 already been randomized (but don't bother if continuing down an existing
3735 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3737 host_item *newlist = NULL;
3740 host_item *h = hostlist;
3741 hostlist = hostlist->next;
3743 h->sort_key = random_number(100);
3750 else if (h->sort_key < newlist->sort_key)
3757 host_item *hh = newlist;
3760 if (h->sort_key < hh->next->sort_key) break;
3768 hostlist = addrlist->host_list = newlist;
3771 /* Sort out the default port. */
3773 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3775 /* For each host-plus-IP-address on the list:
3777 . If this is a continued delivery and the host isn't the one with the
3778 current connection, skip.
3780 . If the status is unusable (i.e. previously failed or retry checked), skip.
3782 . If no IP address set, get the address, either by turning the name into
3783 an address, calling gethostbyname if gethostbyname is on, or by calling
3784 the DNS. The DNS may yield multiple addresses, in which case insert the
3785 extra ones into the list.
3787 . Get the retry data if not previously obtained for this address and set the
3788 field which remembers the state of this address. Skip if the retry time is
3789 not reached. If not, remember whether retry data was found. The retry string
3790 contains both the name and the IP address.
3792 . Scan the list of addresses and mark those whose status is DEFER as
3793 PENDING_DEFER. These are the only ones that will be processed in this cycle
3796 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3797 Some addresses may be successfully delivered, others may fail, and yet
3798 others may get temporary errors and so get marked DEFER.
3800 . The return from the delivery attempt is OK if a connection was made and a
3801 valid SMTP dialogue was completed. Otherwise it is DEFER.
3803 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3805 . If fail to connect, or other defer state, add a retry item.
3807 . If there are any addresses whose status is still DEFER, carry on to the
3808 next host/IPaddress, unless we have tried the number of hosts given
3809 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3810 there is some fancy logic for hosts_max_try that means its limit can be
3811 overstepped in some circumstances.
3813 If we get to the end of the list, all hosts have deferred at least one address,
3814 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3815 delivery attempt to those hosts whose last try was before the arrival time of
3816 the current message. To cope with this, we have to go round the loop a second
3817 time. After that, set the status and error data for any addresses that haven't
3818 had it set already. */
3820 for (cutoff_retry = 0;
3821 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3824 host_item *nexthost = NULL;
3825 int unexpired_hosts_tried = 0;
3827 for (host = hostlist;
3829 && unexpired_hosts_tried < ob->hosts_max_try
3830 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3836 BOOL host_is_expired = FALSE;
3837 BOOL message_defer = FALSE;
3838 BOOL some_deferred = FALSE;
3839 address_item *first_addr = NULL;
3840 uschar *interface = NULL;
3841 uschar *retry_host_key = NULL;
3842 uschar *retry_message_key = NULL;
3843 uschar *serialize_key = NULL;
3845 /* Default next host is next host. :-) But this can vary if the
3846 hosts_max_try limit is hit (see below). It may also be reset if a host
3847 address is looked up here (in case the host was multihomed). */
3849 nexthost = host->next;
3851 /* If the address hasn't yet been obtained from the host name, look it up
3852 now, unless the host is already marked as unusable. If it is marked as
3853 unusable, it means that the router was unable to find its IP address (in
3854 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3855 the lookup failed last time. We don't get this far if *all* MX records
3856 point to non-existent hosts; that is treated as a hard error.
3858 We can just skip this host entirely. When the hosts came from the router,
3859 the address will timeout based on the other host(s); when the address is
3860 looked up below, there is an explicit retry record added.
3862 Note that we mustn't skip unusable hosts if the address is not unset; they
3863 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3867 int new_port, flags;
3870 if (host->status >= hstatus_unusable)
3872 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3877 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3879 /* The host name is permitted to have an attached port. Find it, and
3880 strip it from the name. Just remember it for now. */
3882 new_port = host_item_get_port(host);
3884 /* Count hosts looked up */
3888 /* Find by name if so configured, or if it's an IP address. We don't
3889 just copy the IP address, because we need the test-for-local to happen. */
3891 flags = HOST_FIND_BY_A;
3892 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3893 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3895 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3896 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3898 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3899 &ob->dnssec, /* domains for request/require */
3902 /* Update the host (and any additional blocks, resulting from
3903 multihoming) with a host-specific port, if any. */
3905 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3907 /* Failure to find the host at this time (usually DNS temporary failure)
3908 is really a kind of routing failure rather than a transport failure.
3909 Therefore we add a retry item of the routing kind, not to stop us trying
3910 to look this name up here again, but to ensure the address gets timed
3911 out if the failures go on long enough. A complete failure at this point
3912 commonly points to a configuration error, but the best action is still
3913 to carry on for the next host. */
3915 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3917 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3919 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3920 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3921 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3922 host->status = hstatus_unusable;
3924 for (addr = addrlist; addr; addr = addr->next)
3926 if (addr->transport_return != DEFER) continue;
3927 addr->basic_errno = ERRNO_UNKNOWNHOST;
3928 addr->message = string_sprintf(
3929 rc == HOST_FIND_SECURITY
3930 ? "lookup of IP address for %s was insecure"
3931 : "failed to lookup IP address for %s",
3937 /* If the host is actually the local host, we may have a problem, or
3938 there may be some cunning configuration going on. In the problem case,
3939 log things and give up. The default transport status is already DEFER. */
3941 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3943 for (addr = addrlist; addr; addr = addr->next)
3945 addr->basic_errno = 0;
3946 addr->message = string_sprintf("%s transport found host %s to be "
3947 "local", tblock->name, host->name);
3951 } /* End of block for IP address lookup */
3953 /* If this is a continued delivery, we are interested only in the host
3954 which matches the name of the existing open channel. The check is put
3955 here after the local host lookup, in case the name gets expanded as a
3956 result of the lookup. Set expired FALSE, to save the outer loop executing
3959 if ( continue_hostname
3960 && ( Ustrcmp(continue_hostname, host->name) != 0
3961 || Ustrcmp(continue_host_address, host->address) != 0
3965 continue; /* With next host */
3968 /* Reset the default next host in case a multihomed host whose addresses
3969 are not looked up till just above added to the host list. */
3971 nexthost = host->next;
3973 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3974 domain is in queue_smtp_domains, we don't actually want to attempt any
3975 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3976 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3977 were not in it. We don't want to hold up all SMTP deliveries! Except when
3978 doing a two-stage queue run, don't do this if forcing. */
3980 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3981 match_isinlist(addrlist->domain,
3982 (const uschar **)&queue_smtp_domains, 0,
3983 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3986 for (addr = addrlist; addr; addr = addr->next)
3987 if (addr->transport_return == DEFER)
3988 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3989 continue; /* With next host */
3992 /* Count hosts being considered - purely for an intelligent comment
3993 if none are usable. */
3997 /* Set $host and $host address now in case they are needed for the
3998 interface expansion or the serialize_hosts check; they remain set if an
3999 actual delivery happens. */
4001 deliver_host = host->name;
4002 deliver_host_address = host->address;
4003 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4004 : host->dnssec == DS_NO ? US"no"
4007 /* Set up a string for adding to the retry key if the port number is not
4008 the standard SMTP port. A host may have its own port setting that overrides
4011 pistring = string_sprintf(":%d", host->port == PORT_NONE
4012 ? port : host->port);
4013 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4015 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4016 string is set, even if constant (as different transports can have different
4017 constant settings), we must add it to the key that is used for retries,
4018 because connections to the same host from a different interface should be
4019 treated separately. */
4021 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4022 if ((rs = ob->interface) && *rs)
4024 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4026 pistring = string_sprintf("%s/%s", pistring, interface);
4029 /* The first time round the outer loop, check the status of the host by
4030 inspecting the retry data. The second time round, we are interested only
4031 in expired hosts that haven't been tried since this message arrived. */
4033 if (cutoff_retry == 0)
4036 /* Ensure the status of the address is set by checking retry data if
4037 necessary. There may be host-specific retry data (applicable to all
4038 messages) and also data for retries of a specific message at this host.
4039 If either of these retry records are actually read, the keys used are
4040 returned to save recomputing them later. */
4042 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4043 US"retry_include_ip_address", ob->retry_include_ip_address,
4044 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4045 continue; /* with next host */
4047 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4048 incl_ip, &retry_host_key, &retry_message_key);
4050 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4051 (host->address == NULL)? US"" : host->address, pistring,
4052 (host->status == hstatus_usable)? "usable" :
4053 (host->status == hstatus_unusable)? "unusable" :
4054 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4056 /* Skip this address if not usable at this time, noting if it wasn't
4057 actually expired, both locally and in the address. */
4059 switch (host->status)
4061 case hstatus_unusable:
4063 setflag(addrlist, af_retry_skipped);
4066 case hstatus_unusable_expired:
4069 case hwhy_retry: hosts_retry++; break;
4070 case hwhy_failed: hosts_fail++; break;
4072 case hwhy_deferred: hosts_defer++; break;
4075 /* If there was a retry message key, implying that previously there
4076 was a message-specific defer, we don't want to update the list of
4077 messages waiting for these hosts. */
4079 if (retry_message_key) update_waiting = FALSE;
4080 continue; /* With the next host or IP address */
4084 /* Second time round the loop: if the address is set but expired, and
4085 the message is newer than the last try, let it through. */
4090 || host->status != hstatus_unusable_expired
4091 || host->last_try > received_time)
4093 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4094 host->name, host->address, pistring);
4095 host_is_expired = TRUE;
4098 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4099 it remains TRUE only if all hosts are expired and none are actually tried.
4104 /* If this host is listed as one to which access must be serialized,
4105 see if another Exim process has a connection to it, and if so, skip
4106 this host. If not, update the database to record our connection to it
4107 and remember this for later deletion. Do not do any of this if we are
4108 sending the message down a pre-existing connection. */
4110 if ( !continue_hostname
4111 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4113 serialize_key = string_sprintf("host-serialize-%s", host->name);
4114 if (!enq_start(serialize_key, 1))
4117 debug_printf("skipping host %s because another Exim process "
4118 "is connected to it\n", host->name);
4124 /* OK, we have an IP address that is not waiting for its retry time to
4125 arrive (it might be expired) OR (second time round the loop) we have an
4126 expired host that hasn't been tried since the message arrived. Have a go
4127 at delivering the message to it. First prepare the addresses by flushing
4128 out the result of previous attempts, and finding the first address that
4129 is still to be delivered. */
4131 first_addr = prepare_addresses(addrlist, host);
4133 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4134 message_id, host->name, host->address, addrlist->address,
4135 addrlist->next ? ", ..." : "");
4137 set_process_info("delivering %s to %s [%s] (%s%s)",
4138 message_id, host->name, host->address, addrlist->address,
4139 addrlist->next ? ", ..." : "");
4141 /* This is not for real; don't do the delivery. If there are
4142 any remaining hosts, list them. */
4147 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4148 for (addr = addrlist; addr; addr = addr->next)
4150 addr->host_used = host;
4151 addr->special_action = '*';
4152 addr->message = US"delivery bypassed by -N option";
4156 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4157 "*** host and remaining hosts:\n", tblock->name);
4158 for (host2 = host; host2; host2 = host2->next)
4159 debug_printf(" %s [%s]\n", host2->name,
4160 host2->address ? host2->address : US"unset");
4165 /* This is for real. If the host is expired, we don't count it for
4166 hosts_max_retry. This ensures that all hosts must expire before an address
4167 is timed out, unless hosts_max_try_hardlimit (which protects against
4168 lunatic DNS configurations) is reached.
4170 If the host is not expired and we are about to hit the hosts_max_retry
4171 limit, check to see if there is a subsequent hosts with a different MX
4172 value. If so, make that the next host, and don't count this one. This is a
4173 heuristic to make sure that different MXs do get tried. With a normal kind
4174 of retry rule, they would get tried anyway when the earlier hosts were
4175 delayed, but if the domain has a "retry every time" type of rule - as is
4176 often used for the the very large ISPs, that won't happen. */
4181 /* Make a copy of the host if it is local to this invocation
4182 of the transport. */
4186 thost = store_get(sizeof(host_item));
4188 thost->name = string_copy(host->name);
4189 thost->address = string_copy(host->address);
4194 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4198 debug_printf("hosts_max_try limit reached with this host\n");
4199 for (h = host; h; h = h->next) if (h->mx != host->mx)
4202 unexpired_hosts_tried--;
4203 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4204 "and will be tried\n");
4209 /* Attempt the delivery. */
4211 total_hosts_tried++;
4212 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4213 &message_defer, FALSE);
4216 OK => connection made, each address contains its result;
4217 message_defer is set for message-specific defers (when all
4218 recipients are marked defer)
4219 DEFER => there was a non-message-specific delivery problem;
4220 ERROR => there was a problem setting up the arguments for a filter,
4221 or there was a problem with expanding added headers
4224 /* If the result is not OK, there was a non-message-specific problem.
4225 If the result is DEFER, we need to write to the logs saying what happened
4226 for this particular host, except in the case of authentication and TLS
4227 failures, where the log has already been written. If all hosts defer a
4228 general message is written at the end. */
4230 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4231 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4232 write_logs(first_addr, host);
4234 #ifndef DISABLE_EVENT
4236 deferred_event_raise(first_addr, host);
4239 /* If STARTTLS was accepted, but there was a failure in setting up the
4240 TLS session (usually a certificate screwup), and the host is not in
4241 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4242 TLS forcibly turned off. We have to start from scratch with a new SMTP
4243 connection. That's why the retry is done from here, not from within
4244 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4245 session, so the in-clear transmission after those errors, if permitted,
4246 happens inside smtp_deliver().] */
4250 && first_addr->basic_errno == ERRNO_TLSFAILURE
4251 && ob->tls_tempfail_tryclear
4252 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4255 log_write(0, LOG_MAIN,
4256 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4257 first_addr->message, host->name, host->address);
4258 first_addr = prepare_addresses(addrlist, host);
4259 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4260 &message_defer, TRUE);
4261 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4262 write_logs(first_addr, host);
4263 # ifndef DISABLE_EVENT
4265 deferred_event_raise(first_addr, host);
4268 #endif /*SUPPORT_TLS*/
4271 /* Delivery attempt finished */
4273 rs = rc == OK ? US"OK"
4274 : rc == DEFER ? US"DEFER"
4275 : rc == ERROR ? US"ERROR"
4278 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4279 message_id, host->name, host->address, addrlist->address,
4280 addrlist->next ? " (& others)" : "", rs);
4282 /* Release serialization if set up */
4284 if (serialize_key) enq_end(serialize_key);
4286 /* If the result is DEFER, or if a host retry record is known to exist, we
4287 need to add an item to the retry chain for updating the retry database
4288 at the end of delivery. We only need to add the item to the top address,
4289 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4290 for any other delivery attempts using the same address. (It is copied into
4291 the unusable tree at the outer level, so even if different address blocks
4292 contain the same address, it still won't get tried again.) */
4294 if (rc == DEFER || retry_host_key)
4296 int delete_flag = rc != DEFER ? rf_delete : 0;
4297 if (!retry_host_key)
4300 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4301 US"retry_include_ip_address", ob->retry_include_ip_address,
4302 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4303 incl_ip = TRUE; /* error; use most-specific retry record */
4305 retry_host_key = incl_ip
4306 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4307 : string_sprintf("T:%S%s", host->name, pistring);
4310 /* If a delivery of another message over an existing SMTP connection
4311 yields DEFER, we do NOT set up retry data for the host. This covers the
4312 case when there are delays in routing the addresses in the second message
4313 that are so long that the server times out. This is alleviated by not
4314 routing addresses that previously had routing defers when handling an
4315 existing connection, but even so, this case may occur (e.g. if a
4316 previously happily routed address starts giving routing defers). If the
4317 host is genuinely down, another non-continued message delivery will
4318 notice it soon enough. */
4320 if (delete_flag != 0 || !continue_hostname)
4321 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4323 /* We may have tried an expired host, if its retry time has come; ensure
4324 the status reflects the expiry for the benefit of any other addresses. */
4328 host->status = host_is_expired
4329 ? hstatus_unusable_expired : hstatus_unusable;
4330 host->why = hwhy_deferred;
4334 /* If message_defer is set (host was OK, but every recipient got deferred
4335 because of some message-specific problem), or if that had happened
4336 previously so that a message retry key exists, add an appropriate item
4337 to the retry chain. Note that if there was a message defer but now there is
4338 a host defer, the message defer record gets deleted. That seems perfectly
4339 reasonable. Also, stop the message from being remembered as waiting
4340 for specific hosts. */
4342 if (message_defer || retry_message_key)
4344 int delete_flag = message_defer ? 0 : rf_delete;
4345 if (!retry_message_key)
4348 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4349 US"retry_include_ip_address", ob->retry_include_ip_address,
4350 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4351 incl_ip = TRUE; /* error; use most-specific retry record */
4353 retry_message_key = incl_ip
4354 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4356 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4358 retry_add_item(addrlist, retry_message_key,
4359 rf_message | rf_host | delete_flag);
4360 update_waiting = FALSE;
4363 /* Any return other than DEFER (that is, OK or ERROR) means that the
4364 addresses have got their final statuses filled in for this host. In the OK
4365 case, see if any of them are deferred. */
4368 for (addr = addrlist; addr; addr = addr->next)
4369 if (addr->transport_return == DEFER)
4371 some_deferred = TRUE;
4375 /* If no addresses deferred or the result was ERROR, return. We do this for
4376 ERROR because a failing filter set-up or add_headers expansion is likely to
4377 fail for any host we try. */
4379 if (rc == ERROR || (rc == OK && !some_deferred))
4381 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4382 return TRUE; /* Each address has its status */
4385 /* If the result was DEFER or some individual addresses deferred, let
4386 the loop run to try other hosts with the deferred addresses, except for the
4387 case when we were trying to deliver down an existing channel and failed.
4388 Don't try any other hosts in this case. */
4390 if (continue_hostname) break;
4392 /* If the whole delivery, or some individual addresses, were deferred and
4393 there are more hosts that could be tried, do not count this host towards
4394 the hosts_max_try limit if the age of the message is greater than the
4395 maximum retry time for this host. This means we may try try all hosts,
4396 ignoring the limit, when messages have been around for some time. This is
4397 important because if we don't try all hosts, the address will never time
4398 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4400 if ((rc == DEFER || some_deferred) && nexthost)
4403 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4405 if (retry && retry->rules)
4407 retry_rule *last_rule;
4408 for (last_rule = retry->rules;
4410 last_rule = last_rule->next);
4411 timedout = time(NULL) - received_time > last_rule->timeout;
4413 else timedout = TRUE; /* No rule => timed out */
4417 unexpired_hosts_tried--;
4418 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4419 "hosts_max_try (message older than host's retry time)\n");
4422 } /* End of loop for trying multiple hosts. */
4424 /* This is the end of the loop that repeats iff expired is TRUE and
4425 ob->delay_after_cutoff is FALSE. The second time round we will
4426 try those hosts that haven't been tried since the message arrived. */
4430 debug_printf("all IP addresses skipped or deferred at least one address\n");
4431 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4432 debug_printf("retrying IP addresses not tried since message arrived\n");
4437 /* Get here if all IP addresses are skipped or defer at least one address. In
4438 MUA wrapper mode, this will happen only for connection or other non-message-
4439 specific failures. Force the delivery status for all addresses to FAIL. */
4443 for (addr = addrlist; addr; addr = addr->next)
4444 addr->transport_return = FAIL;
4448 /* In the normal, non-wrapper case, add a standard message to each deferred
4449 address if there hasn't been an error, that is, if it hasn't actually been
4450 tried this time. The variable "expired" will be FALSE if any deliveries were
4451 actually tried, or if there was at least one host that was not expired. That
4452 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4453 a delivery has been tried, an error code will be set, and the failing of the
4454 message is handled by the retry code later.
4456 If queue_smtp is set, or this transport was called to send a subsequent message
4457 down an existing TCP/IP connection, and something caused the host not to be
4458 found, we end up here, but can detect these cases and handle them specially. */
4460 for (addr = addrlist; addr; addr = addr->next)
4462 /* If host is not NULL, it means that we stopped processing the host list
4463 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4464 means we need to behave as if some hosts were skipped because their retry
4465 time had not come. Specifically, this prevents the address from timing out.
4466 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4467 hosts were tried. */
4470 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4473 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4474 "hosts were tried\n");
4479 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4480 setflag(addr, af_retry_skipped);
4483 if (queue_smtp) /* no deliveries attempted */
4485 addr->transport_return = DEFER;
4486 addr->basic_errno = 0;
4487 addr->message = US"SMTP delivery explicitly queued";
4490 else if ( addr->transport_return == DEFER
4491 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4495 addr->basic_errno = ERRNO_HRETRY;
4496 if (continue_hostname)
4497 addr->message = US"no host found for existing SMTP connection";
4500 setflag(addr, af_pass_message); /* This is not a security risk */
4501 addr->message = string_sprintf(
4502 "all hosts%s have been failing for a long time %s",
4503 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4504 ob->delay_after_cutoff
4505 ? US"(and retry time not reached)"
4506 : US"and were last tried after this message arrived");
4508 /* If we are already using fallback hosts, or there are no fallback hosts
4509 defined, convert the result to FAIL to cause a bounce. */
4511 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4512 addr->transport_return = FAIL;
4517 if (hosts_retry == hosts_total)
4518 s = "retry time not reached for any host%s";
4519 else if (hosts_fail == hosts_total)
4520 s = "all host address lookups%s failed permanently";
4521 else if (hosts_defer == hosts_total)
4522 s = "all host address lookups%s failed temporarily";
4523 else if (hosts_serial == hosts_total)
4524 s = "connection limit reached for all hosts%s";
4525 else if (hosts_fail+hosts_defer == hosts_total)
4526 s = "all host address lookups%s failed";
4528 s = "some host address lookups failed and retry time "
4529 "not reached for other hosts or connection limit reached%s";
4531 addr->message = string_sprintf(s,
4532 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4537 /* Update the database which keeps information about which messages are waiting
4538 for which hosts to become available. For some message-specific errors, the
4539 update_waiting flag is turned off because we don't want follow-on deliveries in
4540 those cases. If this transport instance is explicitly limited to one message
4541 per connection then follow-on deliveries are not possible and there's no need
4542 to create/update the per-transport wait-<transport_name> database. */
4544 if (update_waiting && tblock->connection_max_messages != 1)
4545 transport_update_waiting(hostlist, tblock->name);
4549 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4551 return TRUE; /* Each address has its status */
4556 /* End of transport/smtp.c */