1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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) },
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
95 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
102 # ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
106 # ifndef DISABLE_OCSP
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
117 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
187 /* Default private options block for the smtp transport. */
189 smtp_transport_options_block smtp_transport_option_defaults = {
191 NULL, /* fallback_hosts */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
198 US"smtp", /* protocol */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 US"*", /* hosts_try_chunking */
204 #ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
206 NULL, /* hosts_require_dane */
208 NULL, /* hosts_try_fastopen */
210 US"*", /* hosts_try_prdr */
213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
214 NULL, /* hosts_require_ocsp */
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
218 NULL, /* hosts_verify_avoid_tls */
219 NULL, /* hosts_avoid_pipelining */
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
228 50, /* hosts_max_try_hardlimit */
229 TRUE, /* address_retry_include_sender */
230 FALSE, /* allow_localhost */
231 FALSE, /* authenticated_sender_force */
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
235 { NULL, NULL }, /* dnssec_domains {request,require} */
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
240 FALSE, /* lmtp_ignore_quota */
241 NULL, /* expand_retry_include_ip_address */
242 TRUE /* retry_include_ip_address */
244 ,NULL /* socks_proxy */
247 ,NULL, /* tls_certificate */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
252 US"system", /* tls_verify_certificates */
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
257 US"*", /* tls_try_verify_hosts */
258 US"*" /* tls_verify_cert_hostnames */
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
271 /* some DSN flags for use later */
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285 static BOOL update_waiting; /* TRUE to update the "wait" database */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
289 /*************************************************
290 * Setup entry point *
291 *************************************************/
293 /* This function is called when the transport is about to be used,
294 but before running it in a sub-process. It is used for two things:
296 (1) To set the fallback host list in addresses, when delivering.
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
306 errmsg place for error message (not used)
308 Returns: OK always (FAIL, DEFER not used)
312 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
315 smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
318 errmsg = errmsg; /* Keep picky compilers happy */
322 /* Pass back options if required. This interface is getting very messy. */
326 tf->interface = ob->interface;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
335 tf->helo_data = ob->helo_data;
338 /* Set the fallback host list for all the addresses that don't have fallback
339 host lists, provided that the local host wasn't present in the original host
342 if (!testflag(addrlist, af_local_host_removed))
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
351 /*************************************************
352 * Initialization entry point *
353 *************************************************/
355 /* Called for each instance, after its options have been read, to
356 enable consistency checks to be done, or anything else that needs
359 Argument: pointer to the transport instance block
364 smtp_transport_init(transport_instance *tblock)
366 smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
369 /* Retry_use_local_part defaults FALSE if unset */
371 if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
374 /* Set the default port according to the protocol */
376 if (ob->port == NULL)
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
380 /* Set up the setup entry point, to be called before subprocesses for this
383 tblock->setup = smtp_transport_setup;
385 /* Complain if any of the timeouts are zero. */
387 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
393 /* If hosts_override is set and there are local hosts, set the global
394 flag that stops verify from showing router hosts. */
396 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
398 /* If there are any fallback hosts listed, build a chain of host items
399 for them, but do not do any lookups at this time. */
401 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
408 /*************************************************
409 * Set delivery info into all active addresses *
410 *************************************************/
412 /* Only addresses whose status is >= PENDING are relevant. A lesser
413 status means that an address is not currently being processed.
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
421 host if set, mark addrs as having used this host
422 smtp_greeting from peer
423 helo_response from peer
425 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
426 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
427 this particular type of timeout.
433 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
434 BOOL pass_message, host_item * host
435 #ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
447 for (addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
455 if (pass_message) setflag(addr, af_pass_message);
457 addr->transport_return = rc;
460 addr->host_used = host;
461 #ifdef EXPERIMENTAL_DSN_INFO
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
475 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
478 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479 #ifdef EXPERIMENTAL_DSN_INFO
486 /*************************************************
487 * Check an SMTP response *
488 *************************************************/
490 /* This function is given an errno code and the SMTP response buffer
491 to analyse, together with the host identification for generating messages. It
492 sets an appropriate message and puts the first digit of the response code into
493 the yield variable. If no response was actually read, a suitable digit is
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
502 message where to put an error message
503 pass_message set TRUE if message is an SMTP response
505 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
509 check_response(host_item *host, int *errno_value, int more_errno,
510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
512 uschar * pl = pipelining_active ? US"pipelined " : US"";
514 *yield = '4'; /* Default setting is to give a temporary error */
516 /* Handle response timeout */
518 if (*errno_value == ETIMEDOUT)
520 *message = US string_sprintf("SMTP timeout after %s%s",
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
528 /* Handle malformed SMTP response */
530 if (*errno_value == ERRNO_SMTPFORMAT)
532 const uschar *malfresp = string_printing(buffer);
533 while (isspace(*malfresp)) malfresp++;
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
542 /* Handle a failed filter process error; can't send QUIT as we mustn't
545 if (*errno_value == ERRNO_FILTER_FAIL)
547 *message = US string_sprintf("transport filter process failed (%d)%s",
549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
553 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
556 if (*errno_value == ERRNO_CHHEADER_FAIL)
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
564 /* Handle failure to write a complete data block */
566 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 *message = US string_sprintf("failed to write a data block");
573 /* Handle lack of advertised SMTPUTF8, for international message */
574 if (*errno_value == ERRNO_UTF8_FWD)
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 /* Handle error responses from the remote mailer. */
586 const uschar *s = string_printing(buffer);
587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
588 "%s", pl, smtp_command, s);
589 *pass_message = TRUE;
594 /* No data was read. If there is no errno, this must be the EOF (i.e.
595 connection closed) case, which causes deferral. An explicit connection reset
596 error has the same effect. Otherwise, put the host's identity in the message,
597 leaving the errno value to be interpreted as well. In all cases, we have to
598 assume the connection is now dead. */
600 if (*errno_value == 0 || *errno_value == ECONNRESET)
602 *errno_value = ERRNO_SMTPCLOSED;
603 *message = US string_sprintf("Remote host closed connection "
604 "in response to %s%s", pl, smtp_command);
606 else *message = US string_sprintf("%s [%s]", host->name, host->address);
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
617 /* This writes to the main log and to the message log.
620 addr the address item containing error information
621 host the current host
627 write_logs(address_item *addr, host_item *host)
629 uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
636 message = string_sprintf("%s: %s", message, addr->message);
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
651 msglog_line(host_item * host, uschar * message)
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
659 #ifndef DISABLE_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
668 addr the address item containing error information
669 host the current host
675 deferred_event_raise(address_item *addr, host_item *host)
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
697 (void) event_raise(action, US"msg:host:defer",
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
738 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
754 Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
764 sync_responses(address_item *addrlist, BOOL include_affixes,
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
770 address_item *addr = *sync_addr;
773 /* Handle the response for a MAIL command. On error, reinstate the original
774 command in big_buffer for error message use, and flush any further pending
775 responses before returning, except after I/O errors and timeouts. */
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
782 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
786 uschar flushbuffer[4096];
788 if (buffer[0] == '4')
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
797 && (errno != 0 || flushbuffer[0] == 0))
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
816 /* Read and handle the required number of RCPT responses, matching each one up
817 with an address by scanning for the next address whose status is PENDING_DEFER.
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
824 /* The address was accepted */
825 addr->host_used = host;
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
830 addr->transport_return = PENDING_OK;
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
836 if (testflag(addr, af_dr_retry_exists))
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
840 retry_add_item(addr, altkey, rf_delete);
841 retry_add_item(addr, addr->address_retry_key, rf_delete);
845 /* Timeout while reading the response */
847 else if (errno == ETIMEDOUT)
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
852 retry_add_item(addr, addr->address_retry_key, 0);
853 update_waiting = FALSE;
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
862 else if (errno != 0 || buffer[0] == 0)
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
869 /* Handle SMTP permanent and temporary response codes. */
874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
877 setflag(addr, af_pass_message);
878 msglog_line(host, addr->message);
880 /* The response was 5xx */
882 if (buffer[0] == '5')
884 addr->transport_return = FAIL;
888 /* The response was 4xx */
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
896 #ifndef DISABLE_EVENT
897 event_defer_errno = addr->more_errno;
898 msg_event_raise(US"msg:rcpt:host:defer", addr);
901 /* Log temporary errors if there are more hosts to be tried.
902 If not, log this last one in the == line. */
905 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
907 #ifndef DISABLE_EVENT
909 msg_event_raise(US"msg:rcpt:defer", addr);
912 /* Do not put this message on the list of those waiting for specific
913 hosts, as otherwise it is likely to be tried too often. */
915 update_waiting = FALSE;
917 /* Add a retry item for the address so that it doesn't get tried again
918 too soon. If address_retry_include_sender is true, add the sender address
921 if (address_retry_include_sender)
923 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
925 retry_add_item(addr, altkey, 0);
927 else retry_add_item(addr, addr->address_retry_key, 0);
930 } /* Loop for next RCPT response */
932 /* Update where to start at for the next block of responses, unless we
933 have already handled all the addresses. */
935 if (addr != NULL) *sync_addr = addr->next;
937 /* Handle a response to DATA. If we have not had any good recipients, either
938 previously or in this block, the response is ignored. */
940 if (pending_DATA != 0 &&
941 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
946 if (pending_DATA > 0 || (yield & 1) != 0)
948 if (errno == 0 && buffer[0] == '4')
950 errno = ERRNO_DATA4XX;
951 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
955 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
956 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
957 "is in use and there were no good recipients\n", msg);
960 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
961 present) received 3xx. If any RCPTs were handled and yielded anything other
962 than 4xx, yield will be set non-zero. */
969 /* Do the client side of smtp-level authentication */
972 buffer EHLO response from server (gets overwritten)
973 addrlist chain of potential addresses to deliver
974 host host to deliver to
976 ibp, obp comms channel control blocks
979 OK Success, or failed (but not required): global "smtp_authenticated" set
980 DEFER Failed authentication (and was required)
981 ERROR Internal problem
983 FAIL_SEND Failed communications - transmit
988 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
989 smtp_transport_options_block *ob, BOOL is_esmtp,
990 smtp_inblock *ibp, smtp_outblock *obp)
993 uschar *fail_reason = US"server did not advertise AUTH support";
995 smtp_authenticated = FALSE;
996 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
997 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
999 if (is_esmtp && !regex_AUTH) regex_AUTH =
1000 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1003 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1005 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1006 expand_nmax = -1; /* reset */
1008 /* Must not do this check until after we have saved the result of the
1009 regex match above. */
1011 if (require_auth == OK ||
1012 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1015 fail_reason = US"no common mechanisms were found";
1017 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1019 /* Scan the configured authenticators looking for one which is configured
1020 for use as a client, which is not suppressed by client_condition, and
1021 whose name matches an authentication mechanism supported by the server.
1022 If one is found, attempt to authenticate by calling its client function.
1025 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1029 (au->client_condition != NULL &&
1030 !expand_check_condition(au->client_condition, au->name,
1031 US"client authenticator")))
1033 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1035 (au->client)? "client_condition is false" :
1036 "not configured as a client");
1040 /* Loop to scan supported server mechanisms */
1045 int len = Ustrlen(au->public_name);
1046 while (isspace(*p)) p++;
1048 if (strncmpic(au->public_name, p, len) != 0 ||
1049 (p[len] != 0 && !isspace(p[len])))
1051 while (*p != 0 && !isspace(*p)) p++;
1055 /* Found data for a listed mechanism. Call its client entry. Set
1056 a flag in the outblock so that data is overwritten after sending so
1057 that reflections don't show it. */
1059 fail_reason = US"authentication attempt(s) failed";
1060 obp->authenticating = TRUE;
1061 rc = (au->info->clientcode)(au, ibp, obp,
1062 ob->command_timeout, buffer, bufsize);
1063 obp->authenticating = FALSE;
1064 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1067 /* A temporary authentication failure must hold up delivery to
1068 this host. After a permanent authentication failure, we carry on
1069 to try other authentication methods. If all fail hard, try to
1070 deliver the message unauthenticated unless require_auth was set. */
1075 smtp_authenticated = TRUE; /* stops the outer loop */
1076 client_authenticator = au->name;
1077 if (au->set_client_id != NULL)
1078 client_authenticated_id = expand_string(au->set_client_id);
1081 /* Failure after writing a command */
1086 /* Failure after reading a response */
1089 if (errno != 0 || buffer[0] != '5') return FAIL;
1090 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1091 au->name, host->name, host->address, buffer);
1094 /* Failure by some other means. In effect, the authenticator
1095 decided it wasn't prepared to handle this case. Typically this
1096 is the result of "fail" in an expansion string. Do we need to
1097 log anything here? Feb 2006: a message is now put in the buffer
1098 if logging is required. */
1102 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1103 "authentication H=%s [%s] %s", au->name, host->name,
1104 host->address, buffer);
1107 /* Internal problem, message in buffer. */
1110 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1115 break; /* If not authenticated, try next authenticator */
1116 } /* Loop for scanning supported server mechanisms */
1117 } /* Loop for further authenticators */
1121 /* If we haven't authenticated, but are required to, give up. */
1123 if (require_auth == OK && !smtp_authenticated)
1125 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1126 string_sprintf("authentication required but %s", fail_reason), DEFER,
1135 /* Construct AUTH appendix string for MAIL TO */
1138 buffer to build string
1139 addrlist chain of potential addresses to deliver
1140 ob transport options
1142 Globals smtp_authenticated
1143 client_authenticated_sender
1144 Return True on error, otherwise buffer has (possibly empty) terminated string
1148 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1149 smtp_transport_options_block *ob)
1151 uschar *local_authenticated_sender = authenticated_sender;
1154 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1157 if (ob->authenticated_sender != NULL)
1159 uschar *new = expand_string(ob->authenticated_sender);
1162 if (!expand_string_forcedfail)
1164 uschar *message = string_sprintf("failed to expand "
1165 "authenticated_sender: %s", expand_string_message);
1166 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1170 else if (new[0] != 0) local_authenticated_sender = new;
1173 /* Add the authenticated sender address if present */
1175 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1176 local_authenticated_sender != NULL)
1178 string_format(buffer, bufsize, " AUTH=%s",
1179 auth_xtextencode(local_authenticated_sender,
1180 Ustrlen(local_authenticated_sender)));
1181 client_authenticated_sender = string_copy(local_authenticated_sender);
1191 #ifdef EXPERIMENTAL_DANE
1192 /* Lookup TLSA record for host/port.
1193 Return: OK success with dnssec; DANE mode
1194 DEFER Do not use this host now, may retry later
1195 FAIL_FORCED No TLSA record; DANE not usable
1196 FAIL Do not use this connection
1200 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1202 /* move this out to host.c given the similarity to dns_lookup() ? */
1204 const uschar * fullname = buffer;
1206 /* TLSA lookup string */
1207 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1209 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1212 if (!dns_is_secure(dnsa))
1214 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1220 return DEFER; /* just defer this TLS'd conn */
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
1224 return dane_required ? FAIL : FAIL_FORCED;
1228 return dane_required ? FAIL : DEFER;
1235 typedef struct smtp_compare_s
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1242 /* Create a unique string that identifies this message, it is based on
1243 sender_address, helo_data and tls_certificate if enabled.
1247 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249 address_item * addr1;
1250 uschar * if1 = US"";
1251 uschar * helo1 = US"";
1253 uschar * tlsc1 = US"";
1255 uschar * save_sender_address = sender_address;
1256 uschar * local_identity = NULL;
1257 smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1260 sender_address = sender;
1262 addr1 = deliver_make_addr (sender, TRUE);
1263 deliver_set_expansions(addr1);
1266 if1 = expand_string(ob->interface);
1269 helo1 = expand_string(ob->helo_data);
1272 if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276 local_identity = string_sprintf ("%s^%s", if1, helo1);
1279 deliver_set_expansions(NULL);
1280 sender_address = save_sender_address;
1282 return local_identity;
1287 /* This routine is a callback that is called from transport_check_waiting.
1288 This function will evaluate the incoming message versus the previous
1289 message. If the incoming message is using a different local identity then
1290 we will veto this new message. */
1293 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295 uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1299 current_local_identity =
1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1302 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1305 message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
1308 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1314 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1317 if ( checks & PEER_OFFERED_TLS
1318 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_TLS;
1322 if ( checks & PEER_OFFERED_IGNQ
1323 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1324 PCRE_EOPT, NULL, 0) < 0)
1325 checks &= ~PEER_OFFERED_IGNQ;
1327 if ( checks & PEER_OFFERED_CHUNKING
1328 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_CHUNKING;
1331 #ifndef DISABLE_PRDR
1332 if ( checks & PEER_OFFERED_PRDR
1333 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PRDR;
1338 if ( checks & PEER_OFFERED_UTF8
1339 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_UTF8;
1343 if ( checks & PEER_OFFERED_DSN
1344 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_DSN;
1347 if ( checks & PEER_OFFERED_PIPE
1348 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1349 PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_PIPE;
1352 if ( checks & PEER_OFFERED_SIZE
1353 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_SIZE;
1361 /* Callback for emitting a BDAT data chunk header.
1363 If given a nonzero size, first flush any buffered SMTP commands
1364 then emit the command.
1366 Reap previous SMTP command responses if requested.
1367 Reap one SMTP command response if requested.
1369 Returns: OK or ERROR
1373 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1374 unsigned chunk_size, unsigned flags)
1376 smtp_transport_options_block * ob =
1377 (smtp_transport_options_block *)(tctx->tblock->options_block);
1380 uschar * buffer = tctx->buffer;
1383 /* Write SMTP chunk header command */
1387 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1389 flags & tc_chunk_last ? " LAST" : "")
1390 ) < 0) return ERROR;
1391 if (flags & tc_chunk_last)
1392 data_command = string_copy(big_buffer); /* Save for later error message */
1395 prev_cmd_count = cmd_count += tctx->cmd_count;
1397 /* Reap responses for any previous, but not one we just emitted */
1401 if (tctx->pending_BDAT)
1404 if (flags & tc_reap_prev && prev_cmd_count > 0)
1406 DEBUG(D_transport) debug_printf("look for %d responses"
1407 " for previous pipelined cmds\n", prev_cmd_count);
1409 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1410 tctx->sync_addr, tctx->host, prev_cmd_count,
1411 ob->address_retry_include_sender,
1412 tctx->pending_MAIL, 0,
1414 ob->command_timeout,
1415 buffer, DELIVER_BUFFER_SIZE))
1417 case 1: /* 2xx (only) => OK */
1418 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1419 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1420 case 0: break; /* No 2xx or 5xx, but no probs */
1422 case -1: /* Timeout on RCPT */
1423 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1426 if (!tctx->pending_BDAT)
1427 pipelining_active = FALSE;
1430 /* Reap response for an outstanding BDAT */
1432 if (tctx->pending_BDAT)
1434 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1436 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1437 ob->command_timeout))
1439 if (errno == 0 && buffer[0] == '4')
1441 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1442 tctx->first_addr->more_errno |=
1443 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1448 tctx->pending_BDAT = FALSE;
1449 pipelining_active = FALSE;
1451 else if (chunk_size > 0)
1452 tctx->pending_BDAT = TRUE;
1455 tctx->cmd_count = cmd_count;
1461 /*************************************************
1462 * Make connection for given message *
1463 *************************************************/
1467 ctx connection context
1468 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1469 a second attempt after TLS initialization fails
1470 verify TRUE if connection is for a verify callout, FALSE for
1473 Returns: OK - the connection was made and the delivery attempted;
1474 fd is set in the conn context, tls_out set up.
1475 DEFER - the connection could not be made, or something failed
1476 while setting up the SMTP session, or there was a
1477 non-message-specific error, such as a timeout.
1478 ERROR - helo_data or add_headers or authenticated_sender is
1479 specified for this transport, and the string failed
1483 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls, BOOL verify)
1485 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1486 dns_answer tlsa_dnsa;
1488 BOOL pass_message = FALSE;
1490 uschar * message = NULL;
1495 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1497 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1498 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1500 sx->send_rset = TRUE;
1501 sx->send_quit = TRUE;
1502 sx->setting_up = TRUE;
1504 sx->esmtp_sent = FALSE;
1506 sx->utf8_needed = FALSE;
1508 sx->dsn_all_lasthop = TRUE;
1509 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1511 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1514 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1515 sx->peer_offered = 0;
1516 sx->igquotstr = US"";
1517 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1518 #ifdef EXPERIMENTAL_DSN_INFO
1519 sx->smtp_greeting = NULL;
1520 sx->helo_response = NULL;
1523 smtp_command = US"initial connection";
1524 sx->buffer[0] = '\0';
1526 /* Set up the buffer for reading SMTP response packets. */
1528 sx->inblock.buffer = sx->inbuffer;
1529 sx->inblock.buffersize = sizeof(sx->inbuffer);
1530 sx->inblock.ptr = sx->inbuffer;
1531 sx->inblock.ptrend = sx->inbuffer;
1533 /* Set up the buffer for holding SMTP commands while pipelining */
1535 sx->outblock.buffer = sx->outbuffer;
1536 sx->outblock.buffersize = sizeof(sx->outbuffer);
1537 sx->outblock.ptr = sx->outbuffer;
1538 sx->outblock.cmd_count = 0;
1539 sx->outblock.authenticating = FALSE;
1541 /* Reset the parameters of a TLS session. */
1544 tls_out.cipher = NULL; /* the one we may use for this transport */
1545 tls_out.ourcert = NULL;
1546 tls_out.peercert = NULL;
1547 tls_out.peerdn = NULL;
1548 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1551 tls_out.ocsp = OCSP_NOT_REQ;
1553 /* Flip the legacy TLS-related variables over to the outbound set in case
1554 they're used in the context of the transport. Don't bother resetting
1555 afterward (when being used by a transport) as we're in a subprocess.
1556 For verify, unflipped once the callout is dealt with */
1558 tls_modify_variables(&tls_out);
1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1569 /* Make a connection to the host if this isn't a continued delivery, and handle
1570 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571 specially so they can be identified for retries. */
1573 if (continue_hostname == NULL)
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1578 /* This puts port into host->port */
1579 sx->inblock.sock = sx->outblock.sock =
1580 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1581 sx->ob->connect_timeout, sx->tblock);
1583 if (sx->inblock.sock < 0)
1585 uschar * msg = NULL;
1586 int save_errno = errno;
1589 msg = strerror(errno);
1590 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1592 set_errno_nohost(sx->addrlist,
1593 save_errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : save_errno,
1594 verify ? string_sprintf("could not connect: %s", msg)
1597 sx->send_quit = FALSE;
1601 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1603 tls_out.dane_verified = FALSE;
1604 tls_out.tlsa_usage = 0;
1606 if (sx->host->dnssec == DS_YES)
1608 if( sx->dane_required
1609 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1611 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1613 case OK: sx->dane = TRUE; break;
1614 case FAIL_FORCED: break;
1615 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1616 string_sprintf("DANE error: tlsa lookup %s",
1617 rc == DEFER ? "DEFER" : "FAIL"),
1622 else if (sx->dane_required)
1624 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1625 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1631 sx->ob->tls_tempfail_tryclear = FALSE;
1635 /* Expand the greeting message while waiting for the initial response. (Makes
1636 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1637 delayed till here so that $sending_interface and $sending_port are set. */
1640 if (!(sx->helo_data = expand_string(sx->helo_data)))
1642 log_write(0, LOG_MAIN|LOG_PANIC,
1643 "<%s>: failed to expand transport's helo_data value for callout: %s",
1644 sx->addrlist->address, expand_string_message);
1649 expand_string_message = NULL;
1650 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1651 &expand_string_message)),
1652 expand_string_message)
1654 log_write(0, LOG_MAIN|LOG_PANIC,
1655 "<%s>: failed to expand transport's helo_data value for callout: %s",
1656 sx->addrlist->address, expand_string_message);
1658 sx->helo_data = NULL;
1662 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1663 is nevertheless a reasonably clean way of programming this kind of logic,
1664 where you want to escape on any error. */
1671 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1673 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1674 '2', sx->ob->command_timeout);
1675 #ifdef EXPERIMENTAL_DSN_INFO
1676 sx->smtp_greeting = string_copy(sx->buffer);
1678 if (!good_response) goto RESPONSE_FAILED;
1680 #ifndef DISABLE_EVENT
1683 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1684 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1685 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1688 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1689 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1697 /* Now check if the helo_data expansion went well, and sign off cleanly if
1702 message = string_sprintf("failed to expand helo_data: %s",
1703 expand_string_message);
1704 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1710 /** Debugging without sending a message
1711 sx->addrlist->transport_return = DEFER;
1715 /* Errors that occur after this point follow an SMTP command, which is
1716 left in big_buffer by smtp_write_command() for use in error messages. */
1718 smtp_command = big_buffer;
1720 /* Tell the remote who we are...
1722 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1723 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1724 greeting is of this form. The assumption was that the far end supports it
1725 properly... but experience shows that there are some that give 5xx responses,
1726 even though the banner includes "ESMTP" (there's a bloody-minded one that
1727 says "ESMTP not spoken here"). Cope with that case.
1729 September 2000: Time has passed, and it seems reasonable now to always send
1730 EHLO at the start. It is also convenient to make the change while installing
1733 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1734 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1735 would be no way to send out the mails, so there is now a host list
1736 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1737 PIPELINING problem as well. Maybe it can also be useful to cure other
1738 problems with broken servers.
1740 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1741 Then somebody tried it with a Microsoft mailer... It seems that all other
1742 mailers use upper case for some reason (the RFC is quite clear about case
1743 independence) so, for peace of mind, I gave in. */
1745 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1747 /* Alas; be careful, since this goto is not an error-out, so conceivably
1748 we might set data between here and the target which we assume to exist
1749 and be usable. I can see this coming back to bite us. */
1753 smtp_peer_options |= PEER_OFFERED_TLS;
1754 suppress_tls = FALSE;
1755 sx->ob->tls_tempfail_tryclear = FALSE;
1756 smtp_command = US"SSL-on-connect";
1763 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1764 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1766 sx->esmtp_sent = TRUE;
1767 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1768 sx->ob->command_timeout))
1770 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1772 #ifdef EXPERIMENTAL_DSN_INFO
1773 sx->helo_response = string_copy(sx->buffer);
1775 goto RESPONSE_FAILED;
1779 #ifdef EXPERIMENTAL_DSN_INFO
1780 sx->helo_response = string_copy(sx->buffer);
1785 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1790 int n = sizeof(sx->buffer);
1791 uschar * rsp = sx->buffer;
1793 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1794 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1796 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1798 good_response = smtp_read_response(&sx->inblock, rsp, n,
1799 '2', sx->ob->command_timeout);
1800 #ifdef EXPERIMENTAL_DSN_INFO
1801 sx->helo_response = string_copy(rsp);
1805 /* Handle special logging for a closed connection after HELO
1806 when had previously sent EHLO */
1808 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1810 sx->send_quit = FALSE;
1811 save_errno = ERRNO_SMTPCLOSED;
1812 message = string_sprintf("Remote host closed connection "
1813 "in response to %s (EHLO response was: %s)",
1814 smtp_command, sx->buffer);
1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1818 goto RESPONSE_FAILED;
1822 sx->peer_offered = smtp_peer_options = 0;
1824 if (sx->esmtp || sx->lmtp)
1826 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
1827 PEER_OFFERED_TLS /* others checked later */
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1833 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1838 /* For continuing deliveries down the same channel, the socket is the standard
1839 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1840 below). Set up the pointer to where subsequent commands will be left, for
1841 error messages. Note that smtp_peer_options will have been
1842 set from the command line if they were set in the process that passed the
1845 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1846 as the continue goes via transport_pass_socket() and doublefork and exec.
1847 It does not wait. Unclear how we keep separate host's responses
1848 separate - we could match up by host ip+port as a bodge. */
1852 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1853 smtp_command = big_buffer;
1854 sx->host->port = sx->port; /* Record the port that was used */
1855 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1858 /* If TLS is available on this connection, whether continued or not, attempt to
1859 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1860 send another EHLO - the server may give a different answer in secure mode. We
1861 use a separate buffer for reading the response to STARTTLS so that if it is
1862 negative, the original EHLO data is available for subsequent analysis, should
1863 the client not be required to use TLS. If the response is bad, copy the buffer
1864 for error analysis. */
1867 if ( smtp_peer_options & PEER_OFFERED_TLS
1869 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1871 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1874 uschar buffer2[4096];
1875 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1878 /* If there is an I/O error, transmission of this message is deferred. If
1879 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1880 false, we also defer. However, if there is a temporary rejection of STARTTLS
1881 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1882 STARTTLS, we carry on. This means we will try to send the message in clear,
1883 unless the host is in hosts_require_tls (tested below). */
1885 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1886 sx->ob->command_timeout))
1890 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1893 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1894 goto RESPONSE_FAILED;
1898 /* STARTTLS accepted: try to negotiate a TLS session. */
1903 address_item * addr;
1904 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1905 # ifdef EXPERIMENTAL_DANE
1906 , sx->dane ? &tlsa_dnsa : NULL
1910 /* TLS negotiation failed; give an error. From outside, this function may
1911 be called again to try in clear on a new connection, if the options permit
1912 it for this host. */
1916 # ifdef EXPERIMENTAL_DANE
1917 if (sx->dane) log_write(0, LOG_MAIN,
1918 "DANE attempt failed; no TLS connection to %s [%s]",
1919 sx->host->name, sx->host->address);
1922 save_errno = ERRNO_TLSFAILURE;
1923 message = US"failure while setting up TLS session";
1924 sx->send_quit = FALSE;
1928 /* TLS session is set up */
1930 smtp_peer_options_wrap = smtp_peer_options;
1931 for (addr = sx->addrlist; addr; addr = addr->next)
1932 if (addr->transport_return == PENDING_DEFER)
1934 addr->cipher = tls_out.cipher;
1935 addr->ourcert = tls_out.ourcert;
1936 addr->peercert = tls_out.peercert;
1937 addr->peerdn = tls_out.peerdn;
1938 addr->ocsp = tls_out.ocsp;
1943 /* if smtps, we'll have smtp_command set to something else; always safe to
1945 smtp_command = big_buffer;
1947 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1948 helo_data is null, we are dealing with a connection that was passed from
1949 another process, and so we won't have expanded helo_data above. We have to
1950 expand it here. $sending_ip_address and $sending_port are set up right at the
1951 start of the Exim process (in exim.c). */
1953 if (tls_out.active >= 0)
1958 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1960 uschar *message = string_sprintf("failed to expand helo_data: %s",
1961 expand_string_message);
1962 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1967 /* For SMTPS we need to wait for the initial OK response. */
1970 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1971 '2', sx->ob->command_timeout);
1972 #ifdef EXPERIMENTAL_DSN_INFO
1973 sx->smtp_greeting = string_copy(sx->buffer);
1975 if (!good_response) goto RESPONSE_FAILED;
1979 greeting_cmd = "EHLO";
1982 greeting_cmd = "HELO";
1984 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1987 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1988 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1990 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1991 '2', sx->ob->command_timeout);
1992 #ifdef EXPERIMENTAL_DSN_INFO
1993 sx->helo_response = string_copy(sx->buffer);
1995 if (!good_response) goto RESPONSE_FAILED;
1996 smtp_peer_options = 0;
1999 /* If the host is required to use a secure channel, ensure that we
2003 # ifdef EXPERIMENTAL_DANE
2006 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2009 save_errno = ERRNO_TLSREQUIRED;
2010 message = string_sprintf("a TLS session is required, but %s",
2011 smtp_peer_options & PEER_OFFERED_TLS
2012 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2015 #endif /*SUPPORT_TLS*/
2017 /* If TLS is active, we have just started it up and re-done the EHLO command,
2018 so its response needs to be analyzed. If TLS is not active and this is a
2019 continued session down a previously-used socket, we haven't just done EHLO, so
2022 if (continue_hostname == NULL
2024 || tls_out.active >= 0
2028 if (sx->esmtp || sx->lmtp)
2030 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2032 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2033 | PEER_OFFERED_CHUNKING
2036 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2037 /*XXX if we hand peercaps on to continued-conn processes,
2038 must not depend on this addr */
2042 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2045 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2046 lmtp_ignore_quota option was set. */
2048 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2050 /* If the response to EHLO specified support for the SIZE parameter, note
2051 this, provided size_addition is non-negative. */
2053 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2055 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2056 the current host, esmtp will be false, so PIPELINING can never be used. If
2057 the current host matches hosts_avoid_pipelining, don't do it. */
2059 if ( sx->peer_offered & PEER_OFFERED_PIPE
2060 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2061 smtp_peer_options |= PEER_OFFERED_PIPE;
2063 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2064 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2066 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2067 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2068 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2070 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2071 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2073 #ifndef DISABLE_PRDR
2074 if ( sx->peer_offered & PEER_OFFERED_PRDR
2075 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2076 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2078 if (sx->peer_offered & PEER_OFFERED_PRDR)
2079 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2082 /* Note if the server supports DSN */
2083 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2084 DEBUG(D_transport) debug_printf("%susing DSN\n",
2085 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2087 /* Note if the response to EHLO specifies support for the AUTH extension.
2088 If it has, check that this host is one we want to authenticate to, and do
2089 the business. The host name and address must be available when the
2090 authenticator's client driver is running. */
2092 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2093 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2095 default: goto SEND_QUIT;
2097 case FAIL_SEND: goto SEND_FAILED;
2098 case FAIL: goto RESPONSE_FAILED;
2102 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2104 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2105 message-specific. */
2107 sx->setting_up = FALSE;
2110 if (sx->addrlist->prop.utf8_msg)
2112 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2113 && !sx->addrlist->prop.utf8_downcvt_maybe;
2114 DEBUG(D_transport) if (!sx->utf8_needed)
2115 debug_printf("utf8: %s downconvert\n",
2116 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2119 /* If this is an international message we need the host to speak SMTPUTF8 */
2120 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2122 errno = ERRNO_UTF8_FWD;
2123 goto RESPONSE_FAILED;
2132 uschar * set_message;
2138 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2139 sx->buffer, &code, &message, &pass_message);
2147 message = US string_sprintf("send() to %s [%s] failed: %s",
2148 sx->host->name, sx->host->address, strerror(save_errno));
2149 sx->send_quit = FALSE;
2153 /* This label is jumped to directly when a TLS negotiation has failed,
2154 or was not done for a host for which it is required. Values will be set
2155 in message and save_errno, and setting_up will always be true. Treat as
2156 a temporary error. */
2163 /* The failure happened while setting up the call; see if the failure was
2164 a 5xx response (this will either be on connection, or following HELO - a 5xx
2165 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2166 never going to accept them. For other errors during setting up (timeouts or
2167 whatever), defer all addresses, and yield DEFER, so that the host is not
2168 tried again for a while. */
2171 sx->ok = FALSE; /* For when reached by GOTO */
2172 set_message = message;
2176 || errno == ERRNO_UTF8_FWD
2180 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2181 #ifdef EXPERIMENTAL_DSN_INFO
2182 , sx->smtp_greeting, sx->helo_response
2191 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2194 tls_close(FALSE, TRUE);
2197 /* Close the socket, and return the appropriate value, first setting
2198 works because the NULL setting is passed back to the calling process, and
2199 remote_max_parallel is forced to 1 when delivering over an existing connection,
2201 If all went well and continue_more is set, we shouldn't actually get here if
2202 there are further addresses, as the return above will be taken. However,
2203 writing RSET might have failed, or there may be other addresses whose hosts are
2204 specified in the transports, and therefore not visible at top level, in which
2205 case continue_more won't get set. */
2207 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2210 shutdown(sx->outblock.sock, SHUT_WR);
2211 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2212 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2213 rc--; /* drain socket */
2214 sx->send_quit = FALSE;
2216 (void)close(sx->inblock.sock);
2217 sx->inblock.sock = sx->outblock.sock = -1;
2219 #ifndef DISABLE_EVENT
2220 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2223 continue_transport = NULL;
2224 continue_hostname = NULL;
2231 /* Create the string of options that will be appended to the MAIL FROM:
2232 in the connection context buffer */
2235 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2237 uschar * p = sx->buffer;
2238 address_item * addr;
2243 /* If we know the receiving MTA supports the SIZE qualification,
2244 send it, adding something to the message size to allow for imprecision
2245 and things that get added en route. Exim keeps the number of lines
2246 in a message, so we can give an accurate value for the original message, but we
2247 need some additional to handle added headers. (Double "." characters don't get
2248 included in the count.) */
2250 if (sx->peer_offered & PEER_OFFERED_SIZE)
2252 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2256 #ifndef DISABLE_PRDR
2257 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2260 sx->prdr_active = FALSE;
2261 if (sx->peer_offered & PEER_OFFERED_PRDR)
2262 for (addr = addrlist; addr; addr = addr->next)
2263 if (addr->transport_return == PENDING_DEFER)
2265 for (addr = addr->next; addr; addr = addr->next)
2266 if (addr->transport_return == PENDING_DEFER)
2267 { /* at least two recipients to send */
2268 sx->prdr_active = TRUE;
2269 sprintf(CS p, " PRDR"); p += 5;
2277 /* If it supports internationalised messages, and this meesage need that,
2280 if ( sx->peer_offered & PEER_OFFERED_UTF8
2281 && addrlist->prop.utf8_msg
2282 && !addrlist->prop.utf8_downcvt
2284 Ustrcpy(p, " SMTPUTF8"), p += 9;
2287 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2288 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2289 addr && address_count < sx->max_rcpt;
2290 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2293 if (!(addr->dsn_flags & rf_dsnlasthop))
2295 sx->dsn_all_lasthop = FALSE;
2300 /* Add any DSN flags to the mail command */
2302 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2304 if (dsn_ret == dsn_ret_hdrs)
2305 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2306 else if (dsn_ret == dsn_ret_full)
2307 { Ustrcpy(p, " RET=FULL"); p += 9; }
2311 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2316 /* If an authenticated_sender override has been specified for this transport
2317 instance, expand it. If the expansion is forced to fail, and there was already
2318 an authenticated_sender for this message, the original value will be used.
2319 Other expansion failures are serious. An empty result is ignored, but there is
2320 otherwise no check - this feature is expected to be used with LMTP and other
2321 cases where non-standard addresses (e.g. without domains) might be required. */
2323 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2331 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2333 uschar * p = sx->buffer;
2336 /* Add any DSN flags to the rcpt command */
2338 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2340 if (addr->dsn_flags & rf_dsnflags)
2345 Ustrcpy(p, " NOTIFY=");
2347 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2349 if (!first) *p++ = ',';
2351 Ustrcpy(p, rf_names[i]);
2356 if (addr->dsn_orcpt)
2358 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2366 /*************************************************
2367 * Deliver address list to given host *
2368 *************************************************/
2370 /* If continue_hostname is not null, we get here only when continuing to
2371 deliver down an existing channel. The channel was passed as the standard
2372 input. TLS is never active on a passed channel; the previous process always
2373 closes it down before passing the connection on.
2375 Otherwise, we have to make a connection to the remote host, and do the
2376 initial protocol exchange.
2378 When running as an MUA wrapper, if the sender or any recipient is rejected,
2379 temporarily or permanently, we force failure for all recipients.
2382 addrlist chain of potential addresses to deliver; only those whose
2383 transport_return field is set to PENDING_DEFER are currently
2384 being processed; others should be skipped - they have either
2385 been delivered to an earlier host or IP address, or been
2386 failed by one of them.
2387 host host to deliver to
2388 host_af AF_INET or AF_INET6
2389 port default TCP/IP port to use, in host byte order
2390 interface interface to bind to, or NULL
2391 tblock transport instance block
2392 message_defer set TRUE if yield is OK, but all addresses were deferred
2393 because of a non-recipient, non-host failure, that is, a
2394 4xx response to MAIL FROM, DATA, or ".". This is a defer
2395 that is specific to the message.
2396 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2397 a second attempt after TLS initialization fails
2399 Returns: OK - the connection was made and the delivery attempted;
2400 the result for each address is in its data block.
2401 DEFER - the connection could not be made, or something failed
2402 while setting up the SMTP session, or there was a
2403 non-message-specific error, such as a timeout.
2404 ERROR - a filter command is specified for this transport,
2405 and there was a problem setting it up; OR helo_data
2406 or add_headers or authenticated_sender is specified
2407 for this transport, and the string failed to expand
2411 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2412 uschar *interface, transport_instance *tblock,
2413 BOOL *message_defer, BOOL suppress_tls)
2416 address_item *sync_addr;
2417 address_item *first_addr = addrlist;
2422 time_t start_delivery_time = time(NULL);
2424 BOOL completed_address = FALSE;
2427 BOOL pass_message = FALSE;
2428 uschar *message = NULL;
2429 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2434 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2435 *message_defer = FALSE;
2437 sx.addrlist = addrlist;
2439 sx.host_af = host_af,
2441 sx.interface = interface;
2442 sx.helo_data = NULL;
2445 /* Get the channel set up ready for a message (MAIL FROM being the next
2446 SMTP command to send */
2448 if ((rc = smtp_setup_conn(&sx, suppress_tls, FALSE)) != OK)
2451 /* If there is a filter command specified for this transport, we can now
2452 set it up. This cannot be done until the identify of the host is known. */
2454 if (tblock->filter_command != NULL)
2458 sprintf(CS fbuf, "%.50s transport", tblock->name);
2459 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2460 TRUE, DEFER, addrlist, fbuf, NULL);
2461 transport_filter_timeout = tblock->filter_timeout;
2463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2468 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2474 if ( transport_filter_argv
2475 && *transport_filter_argv
2476 && **transport_filter_argv
2477 && sx.peer_offered & PEER_OFFERED_CHUNKING
2480 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2481 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2486 /* For messages that have more than the maximum number of envelope recipients,
2487 we want to send several transactions down the same SMTP connection. (See
2488 comments in deliver.c as to how this reconciles, heuristically, with
2489 remote_max_parallel.) This optimization was added to Exim after the following
2490 code was already working. The simplest way to put it in without disturbing the
2491 code was to use a goto to jump back to this point when there is another
2492 transaction to handle. */
2495 sync_addr = first_addr;
2497 sx.send_rset = TRUE;
2498 completed_address = FALSE;
2501 /* Initiate a message transfer. */
2503 if (build_mailcmd_options(&sx, first_addr) != OK)
2509 /* From here until we send the DATA command, we can make use of PIPELINING
2510 if the server host supports it. The code has to be able to check the responses
2511 at any point, for when the buffer fills up, so we write it totally generally.
2512 When PIPELINING is off, each command written reports that it has flushed the
2515 sx.pending_MAIL = TRUE; /* The block starts with MAIL */
2518 uschar * s = return_path;
2520 uschar * errstr = NULL;
2522 /* If we must downconvert, do the from-address here. Remember we had to
2523 for the to-addresses (done below), and also (ugly) for re-doing when building
2524 the delivery log line. */
2526 if ( addrlist->prop.utf8_msg
2527 && (addrlist->prop.utf8_downcvt || !(sx.peer_offered & PEER_OFFERED_UTF8))
2530 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2532 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2536 setflag(addrlist, af_utf8_downcvt);
2540 rc = smtp_write_command(&sx.outblock, pipelining_active,
2541 "MAIL FROM:<%s>%s\r\n", s, sx.buffer);
2544 mail_command = string_copy(big_buffer); /* Save for later error message */
2548 case -1: /* Transmission error */
2551 case +1: /* Block was sent */
2552 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2553 sx.ob->command_timeout))
2555 if (errno == 0 && sx.buffer[0] == '4')
2557 errno = ERRNO_MAIL4XX;
2558 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2560 goto RESPONSE_FAILED;
2562 sx.pending_MAIL = FALSE;
2566 /* Pass over all the relevant recipient addresses for this host, which are the
2567 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2568 several before we have to read the responses for those seen so far. This
2569 checking is done by a subroutine because it also needs to be done at the end.
2570 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2571 the next one if not all are sent.
2573 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2574 last address because we want to abort if any recipients have any kind of
2575 problem, temporary or permanent. We know that all recipient addresses will have
2576 the PENDING_DEFER status, because only one attempt is ever made, and we know
2577 that max_rcpt will be large, so all addresses will be done at once. */
2579 for (addr = first_addr, address_count = 0;
2580 addr && address_count < sx.max_rcpt;
2581 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2587 addr->dsn_aware = sx.peer_offered & PEER_OFFERED_DSN
2588 ? dsn_support_yes : dsn_support_no;
2591 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2593 build_rcptcmd_options(&sx, addr);
2595 /* Now send the RCPT command, and process outstanding responses when
2596 necessary. After a timeout on RCPT, we just end the function, leaving the
2597 yield as OK, because this error can often mean that there is a problem with
2598 just one address, so we don't want to delay the host. */
2600 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2603 if ( testflag(addrlist, af_utf8_downcvt)
2604 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2607 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2608 errno = ERRNO_EXPANDFAIL;
2613 count = smtp_write_command(&sx.outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2614 rcpt_addr, sx.igquotstr, sx.buffer);
2616 if (count < 0) goto SEND_FAILED;
2619 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2620 &sync_addr, host, count, sx.ob->address_retry_include_sender,
2621 sx.pending_MAIL, 0, &sx.inblock, sx.ob->command_timeout, sx.buffer,
2624 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2625 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2628 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2629 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2630 case 0: /* No 2xx or 5xx, but no probs */
2633 case -1: goto END_OFF; /* Timeout on RCPT */
2634 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2636 sx.pending_MAIL = FALSE; /* Dealt with MAIL */
2638 } /* Loop for next address */
2640 /*XXX potential break point for verify-callouts here. The MAIL and
2641 RCPT handling is relevant there */
2643 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2644 permanently or temporarily. We should have flushed and synced after the last
2649 address_item *badaddr;
2650 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2651 if (badaddr->transport_return != PENDING_OK)
2653 /*XXX could we find a better errno than 0 here? */
2654 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2655 testflag(badaddr, af_pass_message));
2661 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2662 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2663 have a good recipient buffered up if we are pipelining. We don't want to waste
2664 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2665 are pipelining. The responses are all handled by sync_responses().
2666 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2669 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2670 && (sx.ok || (pipelining_active && !mua_wrapper)))
2672 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2674 if (count < 0) goto SEND_FAILED;
2675 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2676 host, count, sx.ob->address_retry_include_sender, sx.pending_MAIL,
2677 sx.ok ? +1 : -1, &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2679 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2680 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2683 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2684 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2685 case 0: break; /* No 2xx or 5xx, but no probs */
2687 case -1: goto END_OFF; /* Timeout on RCPT */
2688 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2690 pipelining_active = FALSE;
2691 data_command = string_copy(big_buffer); /* Save for later error message */
2694 /* If there were no good recipients (but otherwise there have been no
2695 problems), just set ok TRUE, since we have handled address-specific errors
2696 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2697 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2698 well as body. Set the appropriate timeout value to be used for each chunk.
2699 (Haven't been able to make it work using select() for writing yet.) */
2701 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2703 /* Save the first address of the next batch. */
2710 transport_ctx tctx = {
2713 US".", US"..", /* Escaping strings */
2714 topt_use_crlf | topt_escape_headers
2715 | (tblock->body_only ? topt_no_headers : 0)
2716 | (tblock->headers_only ? topt_no_body : 0)
2717 | (tblock->return_path_add ? topt_add_return_path : 0)
2718 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2719 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2722 /* If using CHUNKING we need a callback from the generic transport
2723 support to us, for the sending of BDAT smtp commands and the reaping
2724 of responses. The callback needs a whole bunch of state so set up
2725 a transport-context structure to be passed around. */
2727 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2729 tctx.check_string = tctx.escape_string = NULL;
2730 tctx.options |= topt_use_bdat;
2731 tctx.chunk_cb = smtp_chunk_cmd_callback;
2732 tctx.inblock = &sx.inblock;
2733 tctx.outblock = &sx.outblock;
2735 tctx.first_addr = first_addr;
2736 tctx.sync_addr = &sync_addr;
2737 tctx.pending_MAIL = sx.pending_MAIL;
2738 tctx.pending_BDAT = FALSE;
2739 tctx.good_RCPT = sx.ok;
2740 tctx.completed_address = &completed_address;
2742 tctx.buffer = sx.buffer;
2745 tctx.options |= topt_end_dot;
2747 /* Save the first address of the next batch. */
2750 /* Responses from CHUNKING commands go in buffer. Otherwise,
2751 there has not been a response. */
2755 sigalrm_seen = FALSE;
2756 transport_write_timeout = sx.ob->data_timeout;
2757 smtp_command = US"sending data block"; /* For error messages */
2758 DEBUG(D_transport|D_v)
2759 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2760 debug_printf(" will write message using CHUNKING\n");
2762 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2763 transport_count = 0;
2765 #ifndef DISABLE_DKIM
2766 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2768 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2771 /* transport_write_message() uses write() because it is called from other
2772 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2773 it can exit with "Broken pipe" as its error. This really means that the
2774 socket got closed at the far end. */
2776 transport_write_timeout = 0; /* for subsequent transports */
2778 /* Failure can either be some kind of I/O disaster (including timeout),
2779 or the failure of a transport filter or the expansion of added headers.
2780 Or, when CHUNKING, it can be a protocol-detected failure. */
2783 goto RESPONSE_FAILED;
2785 /* We used to send the terminating "." explicitly here, but because of
2786 buffering effects at both ends of TCP/IP connections, you don't gain
2787 anything by keeping it separate, so it might as well go in the final
2788 data buffer for efficiency. This is now done by setting the topt_end_dot
2791 smtp_command = US"end of data";
2793 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2795 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2796 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2797 host, tctx.cmd_count-1, sx.ob->address_retry_include_sender,
2799 &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2801 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2802 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2805 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2806 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2807 case 0: break; /* No 2xx or 5xx, but no probs */
2809 case -1: goto END_OFF; /* Timeout on RCPT */
2810 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2814 #ifndef DISABLE_PRDR
2815 /* For PRDR we optionally get a partial-responses warning
2816 * followed by the individual responses, before going on with
2817 * the overall response. If we don't get the warning then deal
2818 * with per non-PRDR. */
2821 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2822 sx.ob->final_timeout);
2823 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2825 case '2': sx.prdr_active = FALSE;
2828 case '4': errno = ERRNO_DATA4XX;
2829 addrlist->more_errno |=
2830 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2837 /* For non-PRDR SMTP, we now read a single response that applies to the
2838 whole message. If it is OK, then all the addresses have been delivered. */
2842 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2843 sx.ob->final_timeout);
2844 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2846 errno = ERRNO_DATA4XX;
2847 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2851 /* For LMTP, we get back a response for every RCPT command that we sent;
2852 some may be accepted and some rejected. For those that get a response, their
2853 status is fixed; any that are accepted have been handed over, even if later
2854 responses crash - at least, that's how I read RFC 2033.
2856 If all went well, mark the recipient addresses as completed, record which
2857 host/IPaddress they were delivered to, and cut out RSET when sending another
2858 message down the same channel. Write the completed addresses to the journal
2859 now so that they are recorded in case there is a crash of hardware or
2860 software before the spool gets updated. Also record the final SMTP
2861 confirmation if needed (for SMTP only). */
2866 int delivery_time = (int)(time(NULL) - start_delivery_time);
2868 uschar *conf = NULL;
2870 sx.send_rset = FALSE;
2871 pipelining_active = FALSE;
2873 /* Set up confirmation if needed - applies only to SMTP */
2876 #ifdef DISABLE_EVENT
2877 LOGGING(smtp_confirmation) &&
2882 const uschar *s = string_printing(sx.buffer);
2883 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2884 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2887 /* Process all transported addresses - for LMTP or PRDR, read a status for
2890 for (addr = addrlist; addr != first_addr; addr = addr->next)
2892 if (addr->transport_return != PENDING_OK) continue;
2894 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2895 remaining addresses. Otherwise, it's a return code for just the one
2896 address. For temporary errors, add a retry item for the address so that
2897 it doesn't get tried again too soon. */
2899 #ifndef DISABLE_PRDR
2900 if (sx.lmtp || sx.prdr_active)
2905 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2906 sx.ob->final_timeout))
2908 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2909 addr->message = string_sprintf(
2910 #ifndef DISABLE_PRDR
2911 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2913 "LMTP error after %s: %s",
2915 data_command, string_printing(sx.buffer));
2916 setflag(addr, af_pass_message); /* Allow message to go to user */
2917 if (sx.buffer[0] == '5')
2918 addr->transport_return = FAIL;
2921 errno = ERRNO_DATA4XX;
2922 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2923 addr->transport_return = DEFER;
2924 #ifndef DISABLE_PRDR
2925 if (!sx.prdr_active)
2927 retry_add_item(addr, addr->address_retry_key, 0);
2931 completed_address = TRUE; /* NOW we can set this flag */
2932 if (LOGGING(smtp_confirmation))
2934 const uschar *s = string_printing(sx.buffer);
2935 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2936 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2940 /* SMTP, or success return from LMTP for this address. Pass back the
2941 actual host that was used. */
2943 addr->transport_return = OK;
2944 addr->more_errno = delivery_time;
2945 addr->host_used = host;
2946 addr->special_action = flag;
2947 addr->message = conf;
2948 #ifndef DISABLE_PRDR
2949 if (sx.prdr_active) addr->flags |= af_prdr_used;
2951 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2954 #ifndef DISABLE_PRDR
2955 if (!sx.prdr_active)
2958 /* Update the journal. For homonymic addresses, use the base address plus
2959 the transport name. See lots of comments in deliver.c about the reasons
2960 for the complications when homonyms are involved. Just carry on after
2961 write error, as it may prove possible to update the spool file later. */
2963 if (testflag(addr, af_homonym))
2964 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2966 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2968 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2969 len = Ustrlen(CS sx.buffer);
2970 if (write(journal_fd, sx.buffer, len) != len)
2971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2972 "%s: %s", sx.buffer, strerror(errno));
2976 #ifndef DISABLE_PRDR
2979 /* PRDR - get the final, overall response. For any non-success
2980 upgrade all the address statuses. */
2981 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2982 sx.ob->final_timeout);
2985 if(errno == 0 && sx.buffer[0] == '4')
2987 errno = ERRNO_DATA4XX;
2988 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2990 for (addr = addrlist; addr != first_addr; addr = addr->next)
2991 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2992 addr->transport_return = PENDING_OK; /* allow set_errno action */
2993 goto RESPONSE_FAILED;
2996 /* Update the journal, or setup retry. */
2997 for (addr = addrlist; addr != first_addr; addr = addr->next)
2998 if (addr->transport_return == OK)
3000 if (testflag(addr, af_homonym))
3001 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3003 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3005 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3006 len = Ustrlen(CS sx.buffer);
3007 if (write(journal_fd, sx.buffer, len) != len)
3008 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3009 "%s: %s", sx.buffer, strerror(errno));
3011 else if (addr->transport_return == DEFER)
3012 retry_add_item(addr, addr->address_retry_key, -2);
3016 /* Ensure the journal file is pushed out to disk. */
3018 if (EXIMfsync(journal_fd) < 0)
3019 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3025 /* Handle general (not specific to one address) failures here. The value of ok
3026 is used to skip over this code on the falling through case. A timeout causes a
3027 deferral. Other errors may defer or fail according to the response code, and
3028 may set up a special errno value, e.g. after connection chopped, which is
3029 assumed if errno == 0 and there is no text in the buffer. If control reaches
3030 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3031 the problem is not related to this specific message. */
3036 uschar * set_message;
3042 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3043 sx.buffer, &code, &message, &pass_message);
3051 message = US string_sprintf("send() to %s [%s] failed: %s",
3052 host->name, host->address, strerror(save_errno));
3053 sx.send_quit = FALSE;
3061 sx.ok = FALSE; /* For when reached by GOTO */
3062 set_message = message;
3064 /* We want to handle timeouts after MAIL or "." and loss of connection after
3065 "." specially. They can indicate a problem with the sender address or with
3066 the contents of the message rather than a real error on the connection. These
3067 cases are treated in the same way as a 4xx response. This next bit of code
3068 does the classification. */
3075 message_error = TRUE;
3079 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3080 Ustrncmp(smtp_command,"end ",4) == 0;
3083 case ERRNO_SMTPCLOSED:
3084 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3088 message_error = FALSE;
3092 /* Handle the cases that are treated as message errors. These are:
3094 (a) negative response or timeout after MAIL
3095 (b) negative response after DATA
3096 (c) negative response or timeout or dropped connection after "."
3097 (d) utf8 support required and not offered
3099 It won't be a negative response or timeout after RCPT, as that is dealt
3100 with separately above. The action in all cases is to set an appropriate
3101 error code for all the addresses, but to leave yield set to OK because the
3102 host itself has not failed. Of course, it might in practice have failed
3103 when we've had a timeout, but if so, we'll discover that at the next
3104 delivery attempt. For a temporary error, set the message_defer flag, and
3105 write to the logs for information if this is not the last host. The error
3106 for the last host will be logged as part of the address's log line. */
3110 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3112 /* If there's an errno, the message contains just the identity of
3117 else /* Anything other than 5 is treated as temporary */
3121 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3122 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3123 msglog_line(host, message);
3124 *message_defer = TRUE;
3128 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3129 ".", or some other transportation error. We defer all addresses and yield
3130 DEFER, except for the case of failed add_headers expansion, or a transport
3131 filter failure, when the yield should be ERROR, to stop it trying other
3137 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3138 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3142 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3143 #ifdef EXPERIMENTAL_DSN_INFO
3144 , sx.smtp_greeting, sx.helo_response
3150 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3151 SMTP session tidily. However, if there were too many addresses to send in one
3152 message (indicated by first_addr being non-NULL) we want to carry on with the
3153 rest of them. Also, it is desirable to send more than one message down the SMTP
3154 connection if there are several waiting, provided we haven't already sent so
3155 many as to hit the configured limit. The function transport_check_waiting looks
3156 for a waiting message and returns its id. Then transport_pass_socket tries to
3157 set up a continued delivery by passing the socket on to another process. The
3158 variable send_rset is FALSE if a message has just been successfully transfered.
3160 If we are already sending down a continued channel, there may be further
3161 addresses not yet delivered that are aimed at the same host, but which have not
3162 been passed in this run of the transport. In this case, continue_more will be
3163 true, and all we should do is send RSET if necessary, and return, leaving the
3166 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3167 do not want to continue with other messages down the same channel, because that
3168 can lead to looping between two or more messages, all with the same,
3169 temporarily failing address(es). [The retry information isn't updated yet, so
3170 new processes keep on trying.] We probably also don't want to try more of this
3171 message's addresses either.
3173 If we have started a TLS session, we have to end it before passing the
3174 connection to a new process. However, not all servers can handle this (Exim
3175 can), so we do not pass such a connection on if the host matches
3176 hosts_nopass_tls. */
3179 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3180 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3181 sx.send_rset, continue_more, yield, first_addr ? "not " : "");
3183 if (completed_address && sx.ok && sx.send_quit)
3186 smtp_compare_t t_compare;
3188 t_compare.tblock = tblock;
3189 t_compare.current_sender_address = sender_address;
3191 if ( first_addr != NULL
3193 || ( ( tls_out.active < 0
3194 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3197 transport_check_waiting(tblock->name, host->name,
3198 tblock->connection_max_messages, new_message_id, &more,
3199 (oicf)smtp_are_same_identities, (void*)&t_compare)
3206 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3208 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3209 host->address, strerror(save_errno));
3210 sx.send_quit = FALSE;
3212 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3213 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3216 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3220 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3221 host->name, host->address, msg);
3225 /* Either RSET was not needed, or it succeeded */
3229 if (first_addr != NULL) /* More addresses still to be sent */
3230 { /* in this run of the transport */
3231 continue_sequence++; /* Causes * in logging */
3234 if (continue_more) return yield; /* More addresses for another run */
3236 /* Pass the socket to a new Exim process. Before doing so, we must shut
3237 down TLS. Not all MTAs allow for the continuation of the SMTP session
3238 when TLS is shut down. We test for this by sending a new EHLO. If we
3239 don't get a good response, we don't attempt to pass the socket on. */
3242 if (tls_out.active >= 0)
3244 tls_close(FALSE, TRUE);
3245 smtp_peer_options = smtp_peer_options_wrap;
3247 && smtp_write_command(&sx.outblock, FALSE,
3248 "EHLO %s\r\n", sx.helo_data) >= 0
3249 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3250 '2', sx.ob->command_timeout);
3254 /* If the socket is successfully passed, we mustn't send QUIT (or
3255 indeed anything!) from here. */
3257 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3258 propagate it from the initial
3260 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3261 host->address, new_message_id, sx.inblock.sock))
3262 sx.send_quit = FALSE;
3265 /* If RSET failed and there are addresses left, they get deferred. */
3267 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3268 #ifdef EXPERIMENTAL_DSN_INFO
3269 , sx.smtp_greeting, sx.helo_response
3275 /* End off tidily with QUIT unless the connection has died or the socket has
3276 been passed to another process. There has been discussion on the net about what
3277 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3278 to wait for a response, but on the other hand, there isn't anything one can do
3279 with an error response, other than log it. Exim used to do that. However,
3280 further discussion suggested that it is positively advantageous not to wait for
3281 the response, but to close the session immediately. This is supposed to move
3282 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3283 load from the server. (Hosts that are both servers and clients may not see much
3284 difference, of course.) Further discussion indicated that this was safe to do
3285 on Unix systems which have decent implementations of TCP/IP that leave the
3286 connection around for a while (TIME_WAIT) after the application has gone away.
3287 This enables the response sent by the server to be properly ACKed rather than
3288 timed out, as can happen on broken TCP/IP implementations on other OS.
3290 This change is being made on 31-Jul-98. After over a year of trouble-free
3291 operation, the old commented-out code was removed on 17-Sep-99. */
3294 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3299 tls_close(FALSE, TRUE);
3302 /* Close the socket, and return the appropriate value, first setting
3303 works because the NULL setting is passed back to the calling process, and
3304 remote_max_parallel is forced to 1 when delivering over an existing connection,
3306 If all went well and continue_more is set, we shouldn't actually get here if
3307 there are further addresses, as the return above will be taken. However,
3308 writing RSET might have failed, or there may be other addresses whose hosts are
3309 specified in the transports, and therefore not visible at top level, in which
3310 case continue_more won't get set. */
3312 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3315 shutdown(sx.outblock.sock, SHUT_WR);
3316 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3317 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3318 rc--; /* drain socket */
3320 (void)close(sx.inblock.sock);
3322 #ifndef DISABLE_EVENT
3323 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3326 continue_transport = NULL;
3327 continue_hostname = NULL;
3334 /*************************************************
3335 * Closedown entry point *
3336 *************************************************/
3338 /* This function is called when exim is passed an open smtp channel
3339 from another incarnation, but the message which it has been asked
3340 to deliver no longer exists. The channel is on stdin.
3342 We might do fancy things like looking for another message to send down
3343 the channel, but if the one we sought has gone, it has probably been
3344 delivered by some other process that itself will seek further messages,
3345 so just close down our connection.
3347 Argument: pointer to the transport instance block
3352 smtp_transport_closedown(transport_instance *tblock)
3354 smtp_transport_options_block *ob =
3355 (smtp_transport_options_block *)tblock->options_block;
3356 smtp_inblock inblock;
3357 smtp_outblock outblock;
3359 uschar inbuffer[4096];
3360 uschar outbuffer[16];
3362 inblock.sock = fileno(stdin);
3363 inblock.buffer = inbuffer;
3364 inblock.buffersize = sizeof(inbuffer);
3365 inblock.ptr = inbuffer;
3366 inblock.ptrend = inbuffer;
3368 outblock.sock = inblock.sock;
3369 outblock.buffersize = sizeof(outbuffer);
3370 outblock.buffer = outbuffer;
3371 outblock.ptr = outbuffer;
3372 outblock.cmd_count = 0;
3373 outblock.authenticating = FALSE;
3375 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3376 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3377 ob->command_timeout);
3378 (void)close(inblock.sock);
3383 /*************************************************
3384 * Prepare addresses for delivery *
3385 *************************************************/
3387 /* This function is called to flush out error settings from previous delivery
3388 attempts to other hosts. It also records whether we got here via an MX record
3389 or not in the more_errno field of the address. We are interested only in
3390 addresses that are still marked DEFER - others may have got delivered to a
3391 previously considered IP address. Set their status to PENDING_DEFER to indicate
3392 which ones are relevant this time.
3395 addrlist the list of addresses
3396 host the host we are delivering to
3398 Returns: the first address for this delivery
3401 static address_item *
3402 prepare_addresses(address_item *addrlist, host_item *host)
3404 address_item *first_addr = NULL;
3406 for (addr = addrlist; addr; addr = addr->next)
3407 if (addr->transport_return == DEFER)
3409 if (!first_addr) first_addr = addr;
3410 addr->transport_return = PENDING_DEFER;
3411 addr->basic_errno = 0;
3412 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3413 addr->message = NULL;
3415 addr->cipher = NULL;
3416 addr->ourcert = NULL;
3417 addr->peercert = NULL;
3418 addr->peerdn = NULL;
3419 addr->ocsp = OCSP_NOT_REQ;
3421 #ifdef EXPERIMENTAL_DSN_INFO
3422 addr->smtp_greeting = NULL;
3423 addr->helo_response = NULL;
3431 /*************************************************
3432 * Main entry point *
3433 *************************************************/
3435 /* See local README for interface details. As this is a remote transport, it is
3436 given a chain of addresses to be delivered in one connection, if possible. It
3437 always returns TRUE, indicating that each address has its own independent
3438 status set, except if there is a setting up problem, in which case it returns
3442 smtp_transport_entry(
3443 transport_instance *tblock, /* data for this instantiation */
3444 address_item *addrlist) /* addresses we are working on */
3448 int hosts_defer = 0;
3450 int hosts_looked_up = 0;
3451 int hosts_retry = 0;
3452 int hosts_serial = 0;
3453 int hosts_total = 0;
3454 int total_hosts_tried = 0;
3456 BOOL expired = TRUE;
3457 uschar *expanded_hosts = NULL;
3459 uschar *tid = string_sprintf("%s transport", tblock->name);
3460 smtp_transport_options_block *ob =
3461 (smtp_transport_options_block *)(tblock->options_block);
3462 host_item *hostlist = addrlist->host_list;
3463 host_item *host = NULL;
3467 debug_printf("%s transport entered\n", tblock->name);
3468 for (addr = addrlist; addr; addr = addr->next)
3469 debug_printf(" %s\n", addr->address);
3472 debug_printf("hostlist:\n");
3473 for (host = hostlist; host; host = host->next)
3474 debug_printf(" %s:%d\n", host->name, host->port);
3476 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3477 continue_hostname, continue_host_address);
3480 /* Set the flag requesting that these hosts be added to the waiting
3481 database if the delivery fails temporarily or if we are running with
3482 queue_smtp or a 2-stage queue run. This gets unset for certain
3483 kinds of error, typically those that are specific to the message. */
3485 update_waiting = TRUE;
3487 /* If a host list is not defined for the addresses - they must all have the
3488 same one in order to be passed to a single transport - or if the transport has
3489 a host list with hosts_override set, use the host list supplied with the
3490 transport. It is an error for this not to exist. */
3492 if (!hostlist || (ob->hosts_override && ob->hosts))
3496 addrlist->message = string_sprintf("%s transport called with no hosts set",
3498 addrlist->transport_return = PANIC;
3499 return FALSE; /* Only top address has status */
3502 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3505 /* If the transport's host list contains no '$' characters, and we are not
3506 randomizing, it is fixed and therefore a chain of hosts can be built once
3507 and for all, and remembered for subsequent use by other calls to this
3508 transport. If, on the other hand, the host list does contain '$', or we are
3509 randomizing its order, we have to rebuild it each time. In the fixed case,
3510 as the hosts string will never be used again, it doesn't matter that we
3511 replace all the : characters with zeros. */
3515 uschar *s = ob->hosts;
3517 if (Ustrchr(s, '$') != NULL)
3519 if (!(expanded_hosts = expand_string(s)))
3521 addrlist->message = string_sprintf("failed to expand list of hosts "
3522 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3523 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3524 return FALSE; /* Only top address has status */
3526 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3527 "\"%s\"\n", s, expanded_hosts);
3531 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3533 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3535 /* Check that the expansion yielded something useful. */
3539 string_sprintf("%s transport has empty hosts setting", tblock->name);
3540 addrlist->transport_return = PANIC;
3541 return FALSE; /* Only top address has status */
3544 /* If there was no expansion of hosts, save the host list for
3547 if (!expanded_hosts) ob->hostlist = hostlist;
3550 /* This is not the first time this transport has been run in this delivery;
3551 the host list was built previously. */
3554 hostlist = ob->hostlist;
3557 /* The host list was supplied with the address. If hosts_randomize is set, we
3558 must sort it into a random order if it did not come from MX records and has not
3559 already been randomized (but don't bother if continuing down an existing
3562 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3564 host_item *newlist = NULL;
3567 host_item *h = hostlist;
3568 hostlist = hostlist->next;
3570 h->sort_key = random_number(100);
3577 else if (h->sort_key < newlist->sort_key)
3584 host_item *hh = newlist;
3587 if (h->sort_key < hh->next->sort_key) break;
3595 hostlist = addrlist->host_list = newlist;
3598 /* Sort out the default port. */
3600 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3602 /* For each host-plus-IP-address on the list:
3604 . If this is a continued delivery and the host isn't the one with the
3605 current connection, skip.
3607 . If the status is unusable (i.e. previously failed or retry checked), skip.
3609 . If no IP address set, get the address, either by turning the name into
3610 an address, calling gethostbyname if gethostbyname is on, or by calling
3611 the DNS. The DNS may yield multiple addresses, in which case insert the
3612 extra ones into the list.
3614 . Get the retry data if not previously obtained for this address and set the
3615 field which remembers the state of this address. Skip if the retry time is
3616 not reached. If not, remember whether retry data was found. The retry string
3617 contains both the name and the IP address.
3619 . Scan the list of addresses and mark those whose status is DEFER as
3620 PENDING_DEFER. These are the only ones that will be processed in this cycle
3623 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3624 Some addresses may be successfully delivered, others may fail, and yet
3625 others may get temporary errors and so get marked DEFER.
3627 . The return from the delivery attempt is OK if a connection was made and a
3628 valid SMTP dialogue was completed. Otherwise it is DEFER.
3630 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3632 . If fail to connect, or other defer state, add a retry item.
3634 . If there are any addresses whose status is still DEFER, carry on to the
3635 next host/IPaddress, unless we have tried the number of hosts given
3636 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3637 there is some fancy logic for hosts_max_try that means its limit can be
3638 overstepped in some circumstances.
3640 If we get to the end of the list, all hosts have deferred at least one address,
3641 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3642 delivery attempt to those hosts whose last try was before the arrival time of
3643 the current message. To cope with this, we have to go round the loop a second
3644 time. After that, set the status and error data for any addresses that haven't
3645 had it set already. */
3647 for (cutoff_retry = 0;
3648 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3651 host_item *nexthost = NULL;
3652 int unexpired_hosts_tried = 0;
3654 for (host = hostlist;
3656 && unexpired_hosts_tried < ob->hosts_max_try
3657 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3663 BOOL host_is_expired = FALSE;
3664 BOOL message_defer = FALSE;
3665 BOOL some_deferred = FALSE;
3666 address_item *first_addr = NULL;
3667 uschar *interface = NULL;
3668 uschar *retry_host_key = NULL;
3669 uschar *retry_message_key = NULL;
3670 uschar *serialize_key = NULL;
3672 /* Default next host is next host. :-) But this can vary if the
3673 hosts_max_try limit is hit (see below). It may also be reset if a host
3674 address is looked up here (in case the host was multihomed). */
3676 nexthost = host->next;
3678 /* If the address hasn't yet been obtained from the host name, look it up
3679 now, unless the host is already marked as unusable. If it is marked as
3680 unusable, it means that the router was unable to find its IP address (in
3681 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3682 the lookup failed last time. We don't get this far if *all* MX records
3683 point to non-existent hosts; that is treated as a hard error.
3685 We can just skip this host entirely. When the hosts came from the router,
3686 the address will timeout based on the other host(s); when the address is
3687 looked up below, there is an explicit retry record added.
3689 Note that we mustn't skip unusable hosts if the address is not unset; they
3690 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3694 int new_port, flags;
3697 if (host->status >= hstatus_unusable)
3699 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3704 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3706 /* The host name is permitted to have an attached port. Find it, and
3707 strip it from the name. Just remember it for now. */
3709 new_port = host_item_get_port(host);
3711 /* Count hosts looked up */
3715 /* Find by name if so configured, or if it's an IP address. We don't
3716 just copy the IP address, because we need the test-for-local to happen. */
3718 flags = HOST_FIND_BY_A;
3719 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3720 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3722 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3723 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3725 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3726 &ob->dnssec, /* domains for request/require */
3729 /* Update the host (and any additional blocks, resulting from
3730 multihoming) with a host-specific port, if any. */
3732 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3734 /* Failure to find the host at this time (usually DNS temporary failure)
3735 is really a kind of routing failure rather than a transport failure.
3736 Therefore we add a retry item of the routing kind, not to stop us trying
3737 to look this name up here again, but to ensure the address gets timed
3738 out if the failures go on long enough. A complete failure at this point
3739 commonly points to a configuration error, but the best action is still
3740 to carry on for the next host. */
3742 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3744 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3746 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3747 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3748 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3749 host->status = hstatus_unusable;
3751 for (addr = addrlist; addr; addr = addr->next)
3753 if (addr->transport_return != DEFER) continue;
3754 addr->basic_errno = ERRNO_UNKNOWNHOST;
3756 string_sprintf("failed to lookup IP address for %s", host->name);
3761 /* If the host is actually the local host, we may have a problem, or
3762 there may be some cunning configuration going on. In the problem case,
3763 log things and give up. The default transport status is already DEFER. */
3765 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3767 for (addr = addrlist; addr; addr = addr->next)
3769 addr->basic_errno = 0;
3770 addr->message = string_sprintf("%s transport found host %s to be "
3771 "local", tblock->name, host->name);
3775 } /* End of block for IP address lookup */
3777 /* If this is a continued delivery, we are interested only in the host
3778 which matches the name of the existing open channel. The check is put
3779 here after the local host lookup, in case the name gets expanded as a
3780 result of the lookup. Set expired FALSE, to save the outer loop executing
3783 if ( continue_hostname
3784 && ( Ustrcmp(continue_hostname, host->name) != 0
3785 || Ustrcmp(continue_host_address, host->address) != 0
3789 continue; /* With next host */
3792 /* Reset the default next host in case a multihomed host whose addresses
3793 are not looked up till just above added to the host list. */
3795 nexthost = host->next;
3797 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3798 domain is in queue_smtp_domains, we don't actually want to attempt any
3799 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3800 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3801 were not in it. We don't want to hold up all SMTP deliveries! Except when
3802 doing a two-stage queue run, don't do this if forcing. */
3804 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3805 match_isinlist(addrlist->domain,
3806 (const uschar **)&queue_smtp_domains, 0,
3807 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3810 for (addr = addrlist; addr; addr = addr->next)
3811 if (addr->transport_return == DEFER)
3812 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3813 continue; /* With next host */
3816 /* Count hosts being considered - purely for an intelligent comment
3817 if none are usable. */
3821 /* Set $host and $host address now in case they are needed for the
3822 interface expansion or the serialize_hosts check; they remain set if an
3823 actual delivery happens. */
3825 deliver_host = host->name;
3826 deliver_host_address = host->address;
3827 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3828 : host->dnssec == DS_NO ? US"no"
3831 /* Set up a string for adding to the retry key if the port number is not
3832 the standard SMTP port. A host may have its own port setting that overrides
3835 pistring = string_sprintf(":%d", host->port == PORT_NONE
3836 ? port : host->port);
3837 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3839 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3840 string is set, even if constant (as different transports can have different
3841 constant settings), we must add it to the key that is used for retries,
3842 because connections to the same host from a different interface should be
3843 treated separately. */
3845 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3846 if ((rs = ob->interface) && *rs)
3848 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3850 pistring = string_sprintf("%s/%s", pistring, interface);
3853 /* The first time round the outer loop, check the status of the host by
3854 inspecting the retry data. The second time round, we are interested only
3855 in expired hosts that haven't been tried since this message arrived. */
3857 if (cutoff_retry == 0)
3860 /* Ensure the status of the address is set by checking retry data if
3861 necessary. There may be host-specific retry data (applicable to all
3862 messages) and also data for retries of a specific message at this host.
3863 If either of these retry records are actually read, the keys used are
3864 returned to save recomputing them later. */
3866 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3867 US"retry_include_ip_address", ob->retry_include_ip_address,
3868 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3869 continue; /* with next host */
3871 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3872 incl_ip, &retry_host_key, &retry_message_key);
3874 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3875 (host->address == NULL)? US"" : host->address, pistring,
3876 (host->status == hstatus_usable)? "usable" :
3877 (host->status == hstatus_unusable)? "unusable" :
3878 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3880 /* Skip this address if not usable at this time, noting if it wasn't
3881 actually expired, both locally and in the address. */
3883 switch (host->status)
3885 case hstatus_unusable:
3887 setflag(addrlist, af_retry_skipped);
3890 case hstatus_unusable_expired:
3893 case hwhy_retry: hosts_retry++; break;
3894 case hwhy_failed: hosts_fail++; break;
3895 case hwhy_deferred: hosts_defer++; break;
3898 /* If there was a retry message key, implying that previously there
3899 was a message-specific defer, we don't want to update the list of
3900 messages waiting for these hosts. */
3902 if (retry_message_key) update_waiting = FALSE;
3903 continue; /* With the next host or IP address */
3907 /* Second time round the loop: if the address is set but expired, and
3908 the message is newer than the last try, let it through. */
3913 || host->status != hstatus_unusable_expired
3914 || host->last_try > received_time)
3916 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3917 host->name, host->address, pistring);
3918 host_is_expired = TRUE;
3921 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3922 it remains TRUE only if all hosts are expired and none are actually tried.
3927 /* If this host is listed as one to which access must be serialized,
3928 see if another Exim process has a connection to it, and if so, skip
3929 this host. If not, update the database to record our connection to it
3930 and remember this for later deletion. Do not do any of this if we are
3931 sending the message down a pre-existing connection. */
3933 if ( !continue_hostname
3934 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3936 serialize_key = string_sprintf("host-serialize-%s", host->name);
3937 if (!enq_start(serialize_key, 1))
3940 debug_printf("skipping host %s because another Exim process "
3941 "is connected to it\n", host->name);
3947 /* OK, we have an IP address that is not waiting for its retry time to
3948 arrive (it might be expired) OR (second time round the loop) we have an
3949 expired host that hasn't been tried since the message arrived. Have a go
3950 at delivering the message to it. First prepare the addresses by flushing
3951 out the result of previous attempts, and finding the first address that
3952 is still to be delivered. */
3954 first_addr = prepare_addresses(addrlist, host);
3956 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3957 message_id, host->name, host->address, addrlist->address,
3958 addrlist->next ? ", ..." : "");
3960 set_process_info("delivering %s to %s [%s] (%s%s)",
3961 message_id, host->name, host->address, addrlist->address,
3962 addrlist->next ? ", ..." : "");
3964 /* This is not for real; don't do the delivery. If there are
3965 any remaining hosts, list them. */
3970 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3971 for (addr = addrlist; addr; addr = addr->next)
3973 addr->host_used = host;
3974 addr->special_action = '*';
3975 addr->message = US"delivery bypassed by -N option";
3979 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3980 "*** host and remaining hosts:\n", tblock->name);
3981 for (host2 = host; host2; host2 = host2->next)
3982 debug_printf(" %s [%s]\n", host2->name,
3983 host2->address ? host2->address : US"unset");
3988 /* This is for real. If the host is expired, we don't count it for
3989 hosts_max_retry. This ensures that all hosts must expire before an address
3990 is timed out, unless hosts_max_try_hardlimit (which protects against
3991 lunatic DNS configurations) is reached.
3993 If the host is not expired and we are about to hit the hosts_max_retry
3994 limit, check to see if there is a subsequent hosts with a different MX
3995 value. If so, make that the next host, and don't count this one. This is a
3996 heuristic to make sure that different MXs do get tried. With a normal kind
3997 of retry rule, they would get tried anyway when the earlier hosts were
3998 delayed, but if the domain has a "retry every time" type of rule - as is
3999 often used for the the very large ISPs, that won't happen. */
4004 /* Make a copy of the host if it is local to this invocation
4005 of the transport. */
4009 thost = store_get(sizeof(host_item));
4011 thost->name = string_copy(host->name);
4012 thost->address = string_copy(host->address);
4017 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4021 debug_printf("hosts_max_try limit reached with this host\n");
4022 for (h = host; h; h = h->next) if (h->mx != host->mx)
4025 unexpired_hosts_tried--;
4026 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4027 "and will be tried\n");
4032 /* Attempt the delivery. */
4034 total_hosts_tried++;
4035 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4036 &message_defer, FALSE);
4039 OK => connection made, each address contains its result;
4040 message_defer is set for message-specific defers (when all
4041 recipients are marked defer)
4042 DEFER => there was a non-message-specific delivery problem;
4043 ERROR => there was a problem setting up the arguments for a filter,
4044 or there was a problem with expanding added headers
4047 /* If the result is not OK, there was a non-message-specific problem.
4048 If the result is DEFER, we need to write to the logs saying what happened
4049 for this particular host, except in the case of authentication and TLS
4050 failures, where the log has already been written. If all hosts defer a
4051 general message is written at the end. */
4053 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4054 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4055 write_logs(first_addr, host);
4057 #ifndef DISABLE_EVENT
4059 deferred_event_raise(first_addr, host);
4062 /* If STARTTLS was accepted, but there was a failure in setting up the
4063 TLS session (usually a certificate screwup), and the host is not in
4064 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4065 TLS forcibly turned off. We have to start from scratch with a new SMTP
4066 connection. That's why the retry is done from here, not from within
4067 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4068 session, so the in-clear transmission after those errors, if permitted,
4069 happens inside smtp_deliver().] */
4073 && first_addr->basic_errno == ERRNO_TLSFAILURE
4074 && ob->tls_tempfail_tryclear
4075 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4078 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4079 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4080 first_addr = prepare_addresses(addrlist, host);
4081 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4082 &message_defer, TRUE);
4083 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4084 write_logs(first_addr, host);
4085 # ifndef DISABLE_EVENT
4087 deferred_event_raise(first_addr, host);
4090 #endif /*SUPPORT_TLS*/
4093 /* Delivery attempt finished */
4095 rs = rc == OK ? US"OK"
4096 : rc == DEFER ? US"DEFER"
4097 : rc == ERROR ? US"ERROR"
4100 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4101 message_id, host->name, host->address, addrlist->address,
4102 addrlist->next ? " (& others)" : "", rs);
4104 /* Release serialization if set up */
4106 if (serialize_key) enq_end(serialize_key);
4108 /* If the result is DEFER, or if a host retry record is known to exist, we
4109 need to add an item to the retry chain for updating the retry database
4110 at the end of delivery. We only need to add the item to the top address,
4111 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4112 for any other delivery attempts using the same address. (It is copied into
4113 the unusable tree at the outer level, so even if different address blocks
4114 contain the same address, it still won't get tried again.) */
4116 if (rc == DEFER || retry_host_key)
4118 int delete_flag = rc != DEFER ? rf_delete : 0;
4119 if (!retry_host_key)
4122 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4123 US"retry_include_ip_address", ob->retry_include_ip_address,
4124 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4125 incl_ip = TRUE; /* error; use most-specific retry record */
4127 retry_host_key = incl_ip
4128 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4129 : string_sprintf("T:%S%s", host->name, pistring);
4132 /* If a delivery of another message over an existing SMTP connection
4133 yields DEFER, we do NOT set up retry data for the host. This covers the
4134 case when there are delays in routing the addresses in the second message
4135 that are so long that the server times out. This is alleviated by not
4136 routing addresses that previously had routing defers when handling an
4137 existing connection, but even so, this case may occur (e.g. if a
4138 previously happily routed address starts giving routing defers). If the
4139 host is genuinely down, another non-continued message delivery will
4140 notice it soon enough. */
4142 if (delete_flag != 0 || !continue_hostname)
4143 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4145 /* We may have tried an expired host, if its retry time has come; ensure
4146 the status reflects the expiry for the benefit of any other addresses. */
4150 host->status = host_is_expired
4151 ? hstatus_unusable_expired : hstatus_unusable;
4152 host->why = hwhy_deferred;
4156 /* If message_defer is set (host was OK, but every recipient got deferred
4157 because of some message-specific problem), or if that had happened
4158 previously so that a message retry key exists, add an appropriate item
4159 to the retry chain. Note that if there was a message defer but now there is
4160 a host defer, the message defer record gets deleted. That seems perfectly
4161 reasonable. Also, stop the message from being remembered as waiting
4162 for specific hosts. */
4164 if (message_defer || retry_message_key)
4166 int delete_flag = message_defer ? 0 : rf_delete;
4167 if (!retry_message_key)
4170 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4171 US"retry_include_ip_address", ob->retry_include_ip_address,
4172 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4173 incl_ip = TRUE; /* error; use most-specific retry record */
4175 retry_message_key = incl_ip
4176 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4178 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4180 retry_add_item(addrlist, retry_message_key,
4181 rf_message | rf_host | delete_flag);
4182 update_waiting = FALSE;
4185 /* Any return other than DEFER (that is, OK or ERROR) means that the
4186 addresses have got their final statuses filled in for this host. In the OK
4187 case, see if any of them are deferred. */
4190 for (addr = addrlist; addr; addr = addr->next)
4191 if (addr->transport_return == DEFER)
4193 some_deferred = TRUE;
4197 /* If no addresses deferred or the result was ERROR, return. We do this for
4198 ERROR because a failing filter set-up or add_headers expansion is likely to
4199 fail for any host we try. */
4201 if (rc == ERROR || (rc == OK && !some_deferred))
4203 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4204 return TRUE; /* Each address has its status */
4207 /* If the result was DEFER or some individual addresses deferred, let
4208 the loop run to try other hosts with the deferred addresses, except for the
4209 case when we were trying to deliver down an existing channel and failed.
4210 Don't try any other hosts in this case. */
4212 if (continue_hostname) break;
4214 /* If the whole delivery, or some individual addresses, were deferred and
4215 there are more hosts that could be tried, do not count this host towards
4216 the hosts_max_try limit if the age of the message is greater than the
4217 maximum retry time for this host. This means we may try try all hosts,
4218 ignoring the limit, when messages have been around for some time. This is
4219 important because if we don't try all hosts, the address will never time
4220 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4222 if ((rc == DEFER || some_deferred) && nexthost)
4225 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4227 if (retry && retry->rules)
4229 retry_rule *last_rule;
4230 for (last_rule = retry->rules;
4232 last_rule = last_rule->next);
4233 timedout = time(NULL) - received_time > last_rule->timeout;
4235 else timedout = TRUE; /* No rule => timed out */
4239 unexpired_hosts_tried--;
4240 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4241 "hosts_max_try (message older than host's retry time)\n");
4244 } /* End of loop for trying multiple hosts. */
4246 /* This is the end of the loop that repeats iff expired is TRUE and
4247 ob->delay_after_cutoff is FALSE. The second time round we will
4248 try those hosts that haven't been tried since the message arrived. */
4252 debug_printf("all IP addresses skipped or deferred at least one address\n");
4253 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4254 debug_printf("retrying IP addresses not tried since message arrived\n");
4259 /* Get here if all IP addresses are skipped or defer at least one address. In
4260 MUA wrapper mode, this will happen only for connection or other non-message-
4261 specific failures. Force the delivery status for all addresses to FAIL. */
4265 for (addr = addrlist; addr; addr = addr->next)
4266 addr->transport_return = FAIL;
4270 /* In the normal, non-wrapper case, add a standard message to each deferred
4271 address if there hasn't been an error, that is, if it hasn't actually been
4272 tried this time. The variable "expired" will be FALSE if any deliveries were
4273 actually tried, or if there was at least one host that was not expired. That
4274 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4275 a delivery has been tried, an error code will be set, and the failing of the
4276 message is handled by the retry code later.
4278 If queue_smtp is set, or this transport was called to send a subsequent message
4279 down an existing TCP/IP connection, and something caused the host not to be
4280 found, we end up here, but can detect these cases and handle them specially. */
4282 for (addr = addrlist; addr; addr = addr->next)
4284 /* If host is not NULL, it means that we stopped processing the host list
4285 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4286 means we need to behave as if some hosts were skipped because their retry
4287 time had not come. Specifically, this prevents the address from timing out.
4288 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4289 hosts were tried. */
4292 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4295 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4296 "hosts were tried\n");
4301 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4302 setflag(addr, af_retry_skipped);
4305 if (queue_smtp) /* no deliveries attempted */
4307 addr->transport_return = DEFER;
4308 addr->basic_errno = 0;
4309 addr->message = US"SMTP delivery explicitly queued";
4312 else if ( addr->transport_return == DEFER
4313 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4317 addr->basic_errno = ERRNO_HRETRY;
4318 if (continue_hostname)
4319 addr->message = US"no host found for existing SMTP connection";
4322 setflag(addr, af_pass_message); /* This is not a security risk */
4323 addr->message = string_sprintf(
4324 "all hosts%s have been failing for a long time %s",
4325 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4326 ob->delay_after_cutoff
4327 ? US"(and retry time not reached)"
4328 : US"and were last tried after this message arrived");
4330 /* If we are already using fallback hosts, or there are no fallback hosts
4331 defined, convert the result to FAIL to cause a bounce. */
4333 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4334 addr->transport_return = FAIL;
4339 if (hosts_retry == hosts_total)
4340 s = "retry time not reached for any host%s";
4341 else if (hosts_fail == hosts_total)
4342 s = "all host address lookups%s failed permanently";
4343 else if (hosts_defer == hosts_total)
4344 s = "all host address lookups%s failed temporarily";
4345 else if (hosts_serial == hosts_total)
4346 s = "connection limit reached for all hosts%s";
4347 else if (hosts_fail+hosts_defer == hosts_total)
4348 s = "all host address lookups%s failed";
4350 s = "some host address lookups failed and retry time "
4351 "not reached for other hosts or connection limit reached%s";
4353 addr->message = string_sprintf(s,
4354 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4359 /* Update the database which keeps information about which messages are waiting
4360 for which hosts to become available. For some message-specific errors, the
4361 update_waiting flag is turned off because we don't want follow-on deliveries in
4362 those cases. If this transport instance is explicitly limited to one message
4363 per connection then follow-on deliveries are not possible and there's no need
4364 to create/update the per-transport wait-<transport_name> database. */
4366 if (update_waiting && tblock->connection_max_messages != 1)
4367 transport_update_waiting(hostlist, tblock->name);
4371 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4373 return TRUE; /* Each address has its status */
4378 /* End of transport/smtp.c */