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 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
15 #define DELIVER_BUFFER_SIZE 4096
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
128 { "hosts_try_prdr", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 { "hosts_verify_avoid_tls", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
135 { "interface", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, interface) },
137 { "keepalive", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, keepalive) },
139 { "lmtp_ignore_quota", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
141 { "max_rcpt", opt_int | opt_public,
142 (void *)offsetof(transport_instance, max_addresses) },
143 { "multi_domain", opt_expand_bool | opt_public,
144 (void *)offsetof(transport_instance, multi_domain) },
145 { "port", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, port) },
147 { "protocol", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, protocol) },
149 { "retry_include_ip_address", opt_expand_bool,
150 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
151 { "serialize_hosts", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
153 { "size_addition", opt_int,
154 (void *)offsetof(smtp_transport_options_block, size_addition) }
156 ,{ "socks_proxy", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 ,{ "tls_certificate", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
162 { "tls_crl", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_crl) },
164 { "tls_dh_min_bits", opt_int,
165 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
166 { "tls_privatekey", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
168 { "tls_require_ciphers", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
170 { "tls_sni", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_sni) },
172 { "tls_tempfail_tryclear", opt_bool,
173 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
174 { "tls_try_verify_hosts", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
176 { "tls_verify_cert_hostnames", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
178 { "tls_verify_certificates", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
185 /* Size of the options list. An extern variable has to be used so that its
186 address can appear in the tables drtables.c. */
188 int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
191 /* Default private options block for the smtp transport. */
193 smtp_transport_options_block smtp_transport_option_defaults = {
195 NULL, /* fallback_hosts */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
202 US"smtp", /* protocol */
204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
207 US"*", /* hosts_try_chunking */
208 #ifdef EXPERIMENTAL_DANE
209 NULL, /* hosts_try_dane */
210 NULL, /* hosts_require_dane */
213 US"*", /* hosts_try_prdr */
216 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
217 NULL, /* hosts_require_ocsp */
219 NULL, /* hosts_require_tls */
220 NULL, /* hosts_avoid_tls */
221 NULL, /* hosts_verify_avoid_tls */
222 NULL, /* hosts_avoid_pipelining */
223 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 5*60, /* command_timeout */
226 5*60, /* connect_timeout; shorter system default overrides */
227 5*60, /* data timeout */
228 10*60, /* final timeout */
229 1024, /* size_addition */
230 5, /* hosts_max_try */
231 50, /* hosts_max_try_hardlimit */
232 TRUE, /* address_retry_include_sender */
233 FALSE, /* allow_localhost */
234 FALSE, /* authenticated_sender_force */
235 FALSE, /* gethostbyname */
236 TRUE, /* dns_qualify_single */
237 FALSE, /* dns_search_parents */
238 { NULL, NULL }, /* dnssec_domains {request,require} */
239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
243 FALSE, /* lmtp_ignore_quota */
244 NULL, /* expand_retry_include_ip_address */
245 TRUE /* retry_include_ip_address */
247 ,NULL /* socks_proxy */
250 ,NULL, /* tls_certificate */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
255 US"system", /* tls_verify_certificates */
256 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
257 /* tls_dh_min_bits */
258 TRUE, /* tls_tempfail_tryclear */
259 NULL, /* tls_verify_hosts */
260 US"*", /* tls_try_verify_hosts */
261 US"*" /* tls_verify_cert_hostnames */
264 , {NULL, /* dkim_canon */
265 NULL, /* dkim_domain */
266 NULL, /* dkim_private_key */
267 NULL, /* dkim_selector */
268 NULL, /* dkim_sign_headers */
269 NULL, /* dkim_strict */
270 FALSE} /* dot_stuffed */
274 /* some DSN flags for use later */
276 static int rf_list[] = {rf_notify_never, rf_notify_success,
277 rf_notify_failure, rf_notify_delay };
279 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
285 static uschar *smtp_command; /* Points to last cmd for error messages */
286 static uschar *mail_command; /* Points to MAIL cmd for error messages */
287 static BOOL update_waiting; /* TRUE to update the "wait" database */
288 static BOOL pipelining_active; /* current transaction is in pipe mode */
289 static int off = 0; /* for use by setsockopt */
292 /*************************************************
293 * Setup entry point *
294 *************************************************/
296 /* This function is called when the transport is about to be used,
297 but before running it in a sub-process. It is used for two things:
299 (1) To set the fallback host list in addresses, when delivering.
300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
309 errmsg place for error message (not used)
311 Returns: OK always (FAIL, DEFER not used)
315 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
318 smtp_transport_options_block *ob =
319 (smtp_transport_options_block *)(tblock->options_block);
321 errmsg = errmsg; /* Keep picky compilers happy */
325 /* Pass back options if required. This interface is getting very messy. */
329 tf->interface = ob->interface;
331 tf->protocol = ob->protocol;
332 tf->hosts = ob->hosts;
333 tf->hosts_override = ob->hosts_override;
334 tf->hosts_randomize = ob->hosts_randomize;
335 tf->gethostbyname = ob->gethostbyname;
336 tf->qualify_single = ob->dns_qualify_single;
337 tf->search_parents = ob->dns_search_parents;
338 tf->helo_data = ob->helo_data;
341 /* Set the fallback host list for all the addresses that don't have fallback
342 host lists, provided that the local host wasn't present in the original host
345 if (!testflag(addrlist, af_local_host_removed))
347 for (; addrlist != NULL; addrlist = addrlist->next)
348 if (addrlist->fallback_hosts == NULL)
349 addrlist->fallback_hosts = ob->fallback_hostlist;
357 /*************************************************
358 * Initialization entry point *
359 *************************************************/
361 /* Called for each instance, after its options have been read, to
362 enable consistency checks to be done, or anything else that needs
365 Argument: pointer to the transport instance block
370 smtp_transport_init(transport_instance *tblock)
372 smtp_transport_options_block *ob =
373 (smtp_transport_options_block *)(tblock->options_block);
375 /* Retry_use_local_part defaults FALSE if unset */
377 if (tblock->retry_use_local_part == TRUE_UNSET)
378 tblock->retry_use_local_part = FALSE;
380 /* Set the default port according to the protocol */
382 if (ob->port == NULL)
383 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
384 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
386 /* Set up the setup entry point, to be called before subprocesses for this
389 tblock->setup = smtp_transport_setup;
391 /* Complain if any of the timeouts are zero. */
393 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
394 ob->final_timeout <= 0)
395 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
396 "command, data, or final timeout value is zero for %s transport",
399 /* If hosts_override is set and there are local hosts, set the global
400 flag that stops verify from showing router hosts. */
402 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404 /* If there are any fallback hosts listed, build a chain of host items
405 for them, but do not do any lookups at this time. */
407 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
414 /*************************************************
415 * Set delivery info into all active addresses *
416 *************************************************/
418 /* Only addresses whose status is >= PENDING are relevant. A lesser
419 status means that an address is not currently being processed.
422 addrlist points to a chain of addresses
423 errno_value to put in each address's errno field
424 msg to put in each address's message field
425 rc to put in each address's transport_return field
426 pass_message if TRUE, set the "pass message" flag in the address
427 host if set, mark addrs as having used this host
428 smtp_greeting from peer
429 helo_response from peer
431 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
432 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
433 this particular type of timeout.
439 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
440 BOOL pass_message, host_item * host
441 #ifdef EXPERIMENTAL_DSN_INFO
442 , const uschar * smtp_greeting, const uschar * helo_response
448 if (errno_value == ERRNO_CONNECTTIMEOUT)
450 errno_value = ETIMEDOUT;
451 orvalue = RTEF_CTOUT;
453 for (addr = addrlist; addr; addr = addr->next)
454 if (addr->transport_return >= PENDING)
456 addr->basic_errno = errno_value;
457 addr->more_errno |= orvalue;
461 if (pass_message) setflag(addr, af_pass_message);
463 addr->transport_return = rc;
466 addr->host_used = host;
467 #ifdef EXPERIMENTAL_DSN_INFO
469 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
470 addr->smtp_greeting = smtp_greeting;
473 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
474 addr->helo_response = helo_response;
481 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
484 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
485 #ifdef EXPERIMENTAL_DSN_INFO
492 /*************************************************
493 * Check an SMTP response *
494 *************************************************/
496 /* This function is given an errno code and the SMTP response buffer
497 to analyse, together with the host identification for generating messages. It
498 sets an appropriate message and puts the first digit of the response code into
499 the yield variable. If no response was actually read, a suitable digit is
503 host the current host, to get its name for messages
504 errno_value pointer to the errno value
505 more_errno from the top address for use with ERRNO_FILTER_FAIL
506 buffer the SMTP response buffer
507 yield where to put a one-digit SMTP response code
508 message where to put an errror message
509 pass_message set TRUE if message is an SMTP response
511 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
515 check_response(host_item *host, int *errno_value, int more_errno,
516 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
518 uschar * pl = pipelining_active ? US"pipelined " : US"";
520 *yield = '4'; /* Default setting is to give a temporary error */
522 /* Handle response timeout */
524 if (*errno_value == ETIMEDOUT)
526 *message = US string_sprintf("SMTP timeout after %s%s",
528 if (transport_count > 0)
529 *message = US string_sprintf("%s (%d bytes written)", *message,
534 /* Handle malformed SMTP response */
536 if (*errno_value == ERRNO_SMTPFORMAT)
538 const uschar *malfresp = string_printing(buffer);
539 while (isspace(*malfresp)) malfresp++;
540 *message = *malfresp == 0
541 ? string_sprintf("Malformed SMTP reply (an empty line) "
542 "in response to %s%s", pl, smtp_command)
543 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
544 pl, smtp_command, malfresp);
548 /* Handle a failed filter process error; can't send QUIT as we mustn't
551 if (*errno_value == ERRNO_FILTER_FAIL)
553 *message = US string_sprintf("transport filter process failed (%d)%s",
555 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
559 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
562 if (*errno_value == ERRNO_CHHEADER_FAIL)
565 US string_sprintf("failed to expand headers_add or headers_remove: %s",
566 expand_string_message);
570 /* Handle failure to write a complete data block */
572 if (*errno_value == ERRNO_WRITEINCOMPLETE)
574 *message = US string_sprintf("failed to write a data block");
579 /* Handle lack of advertised SMTPUTF8, for international message */
580 if (*errno_value == ERRNO_UTF8_FWD)
582 *message = US string_sprintf("utf8 support required but not offered for forwarding");
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
588 /* Handle error responses from the remote mailer. */
592 const uschar *s = string_printing(buffer);
593 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
594 "%s", pl, smtp_command, s);
595 *pass_message = TRUE;
600 /* No data was read. If there is no errno, this must be the EOF (i.e.
601 connection closed) case, which causes deferral. An explicit connection reset
602 error has the same effect. Otherwise, put the host's identity in the message,
603 leaving the errno value to be interpreted as well. In all cases, we have to
604 assume the connection is now dead. */
606 if (*errno_value == 0 || *errno_value == ECONNRESET)
608 *errno_value = ERRNO_SMTPCLOSED;
609 *message = US string_sprintf("Remote host closed connection "
610 "in response to %s%s", pl, smtp_command);
612 else *message = US string_sprintf("%s [%s]", host->name, host->address);
619 /*************************************************
620 * Write error message to logs *
621 *************************************************/
623 /* This writes to the main log and to the message log.
626 addr the address item containing error information
627 host the current host
633 write_logs(address_item *addr, host_item *host)
635 uschar * message = LOGGING(outgoing_port)
636 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
637 host->port == PORT_NONE ? 25 : host->port)
638 : string_sprintf("H=%s [%s]", host->name, host->address);
642 message = string_sprintf("%s: %s", message, addr->message);
643 if (addr->basic_errno > 0)
644 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
645 log_write(0, LOG_MAIN, "%s", message);
646 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
650 const uschar * s = exim_errstr(addr->basic_errno);
651 log_write(0, LOG_MAIN, "%s %s", message, s);
652 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
657 msglog_line(host_item * host, uschar * message)
659 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
665 #ifndef DISABLE_EVENT
666 /*************************************************
667 * Post-defer action *
668 *************************************************/
670 /* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
674 addr the address item containing error information
675 host the current host
681 deferred_event_raise(address_item *addr, host_item *host)
683 uschar * action = addr->transport->event_action;
684 const uschar * save_domain;
690 save_domain = deliver_domain;
691 save_local = deliver_localpart;
693 /*XXX would ip & port already be set up? */
694 deliver_host_address = string_copy(host->address);
695 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696 event_defer_errno = addr->basic_errno;
698 router_name = addr->router->name;
699 transport_name = addr->transport->name;
700 deliver_domain = addr->domain;
701 deliver_localpart = addr->local_part;
703 (void) event_raise(action, US"msg:host:defer",
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
712 deliver_localpart = save_local;
713 deliver_domain = save_domain;
714 router_name = transport_name = NULL;
718 /*************************************************
719 * Synchronize SMTP responses *
720 *************************************************/
722 /* This function is called from smtp_deliver() to receive SMTP responses from
723 the server, and match them up with the commands to which they relate. When
724 PIPELINING is not in use, this function is called after every command, and is
725 therefore somewhat over-engineered, but it is simpler to use a single scheme
726 that works both with and without PIPELINING instead of having two separate sets
729 The set of commands that are buffered up with pipelining may start with MAIL
730 and may end with DATA; in between are RCPT commands that correspond to the
731 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732 etc.) are never buffered.
734 Errors after MAIL or DATA abort the whole process leaving the response in the
735 buffer. After MAIL, pending responses are flushed, and the original command is
736 re-instated in big_buffer for error messages. For RCPT commands, the remote is
737 permitted to reject some recipient addresses while accepting others. However
738 certain errors clearly abort the whole process. Set the value in
739 transport_return to PENDING_OK if the address is accepted. If there is a
740 subsequent general error, it will get reset accordingly. If not, it will get
741 converted to OK at the end.
744 addrlist the complete address list
745 include_affixes TRUE if affixes include in RCPT
746 sync_addr ptr to the ptr of the one to start scanning at (updated)
747 host the host we are connected to
748 count the number of responses to read
750 include_sender true if 4xx retry is to include the sender it its key
751 pending_MAIL true if the first response is for MAIL
752 pending_DATA 0 if last command sent was not DATA
753 +1 if previously had a good recipient
754 -1 if not previously had a good recipient
755 inblock incoming SMTP block
756 timeout timeout value
757 buffer buffer for reading response
758 buffsize size of buffer
760 Returns: 3 if at least one address had 2xx and one had 5xx
761 2 if at least one address had 5xx but none had 2xx
762 1 if at least one host had a 2xx response, but none had 5xx
763 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
764 -1 timeout while reading RCPT response
765 -2 I/O or other non-response error for RCPT
766 -3 DATA or MAIL failed - errno and buffer set
770 sync_responses(address_item *addrlist, BOOL include_affixes,
771 address_item **sync_addr, host_item *host, int count,
772 BOOL address_retry_include_sender, BOOL pending_MAIL,
773 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
776 address_item *addr = *sync_addr;
779 /* Handle the response for a MAIL command. On error, reinstate the original
780 command in big_buffer for error message use, and flush any further pending
781 responses before returning, except after I/O errors and timeouts. */
786 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
788 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && buffer[0] != 0)
792 uschar flushbuffer[4096];
794 if (buffer[0] == '4')
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
801 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
803 && (errno != 0 || flushbuffer[0] == 0))
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = host;
820 if (pending_DATA) count--; /* Number of RCPT responses to come */
822 /* Read and handle the required number of RCPT responses, matching each one up
823 with an address by scanning for the next address whose status is PENDING_DEFER.
828 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
830 /* The address was accepted */
831 addr->host_used = host;
833 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
836 addr->transport_return = PENDING_OK;
838 /* If af_dr_retry_exists is set, there was a routing delay on this address;
839 ensure that any address-specific retry record is expunged. We do this both
840 for the basic key and for the version that also includes the sender. */
842 if (testflag(addr, af_dr_retry_exists))
844 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
846 retry_add_item(addr, altkey, rf_delete);
847 retry_add_item(addr, addr->address_retry_key, rf_delete);
851 /* Timeout while reading the response */
853 else if (errno == ETIMEDOUT)
855 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
856 transport_rcpt_address(addr, include_affixes));
857 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
858 retry_add_item(addr, addr->address_retry_key, 0);
859 update_waiting = FALSE;
863 /* Handle other errors in obtaining an SMTP response by returning -1. This
864 will cause all the addresses to be deferred. Restore the SMTP command in
865 big_buffer for which we are checking the response, so the error message
868 else if (errno != 0 || buffer[0] == 0)
870 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
871 transport_rcpt_address(addr, include_affixes));
875 /* Handle SMTP permanent and temporary response codes. */
880 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
881 "%s", transport_rcpt_address(addr, include_affixes),
882 string_printing(buffer));
883 setflag(addr, af_pass_message);
884 msglog_line(host, addr->message);
886 /* The response was 5xx */
888 if (buffer[0] == '5')
890 addr->transport_return = FAIL;
894 /* The response was 4xx */
898 addr->transport_return = DEFER;
899 addr->basic_errno = ERRNO_RCPT4XX;
900 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
902 #ifndef DISABLE_EVENT
903 event_defer_errno = addr->more_errno;
904 msg_event_raise(US"msg:rcpt:host:defer", addr);
907 /* Log temporary errors if there are more hosts to be tried.
908 If not, log this last one in the == line. */
911 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
913 #ifndef DISABLE_EVENT
915 msg_event_raise(US"msg:rcpt:defer", addr);
918 /* Do not put this message on the list of those waiting for specific
919 hosts, as otherwise it is likely to be tried too often. */
921 update_waiting = FALSE;
923 /* Add a retry item for the address so that it doesn't get tried again
924 too soon. If address_retry_include_sender is true, add the sender address
927 if (address_retry_include_sender)
929 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
931 retry_add_item(addr, altkey, 0);
933 else retry_add_item(addr, addr->address_retry_key, 0);
936 } /* Loop for next RCPT response */
938 /* Update where to start at for the next block of responses, unless we
939 have already handled all the addresses. */
941 if (addr != NULL) *sync_addr = addr->next;
943 /* Handle a response to DATA. If we have not had any good recipients, either
944 previously or in this block, the response is ignored. */
946 if (pending_DATA != 0 &&
947 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
952 if (pending_DATA > 0 || (yield & 1) != 0)
954 if (errno == 0 && buffer[0] == '4')
956 errno = ERRNO_DATA4XX;
957 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
961 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
962 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
963 "is in use and there were no good recipients\n", msg);
966 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
967 present) received 3xx. If any RCPTs were handled and yielded anything other
968 than 4xx, yield will be set non-zero. */
975 /* Do the client side of smtp-level authentication */
978 buffer EHLO response from server (gets overwritten)
979 addrlist chain of potential addresses to deliver
980 host host to deliver to
982 ibp, obp comms channel control blocks
985 OK Success, or failed (but not required): global "smtp_authenticated" set
986 DEFER Failed authentication (and was required)
987 ERROR Internal problem
989 FAIL_SEND Failed communications - transmit
994 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
995 smtp_transport_options_block *ob, BOOL is_esmtp,
996 smtp_inblock *ibp, smtp_outblock *obp)
999 uschar *fail_reason = US"server did not advertise AUTH support";
1001 smtp_authenticated = FALSE;
1002 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1003 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1005 if (is_esmtp && !regex_AUTH) regex_AUTH =
1006 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1009 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1011 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1012 expand_nmax = -1; /* reset */
1014 /* Must not do this check until after we have saved the result of the
1015 regex match above. */
1017 if (require_auth == OK ||
1018 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1021 fail_reason = US"no common mechanisms were found";
1023 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1025 /* Scan the configured authenticators looking for one which is configured
1026 for use as a client, which is not suppressed by client_condition, and
1027 whose name matches an authentication mechanism supported by the server.
1028 If one is found, attempt to authenticate by calling its client function.
1031 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1035 (au->client_condition != NULL &&
1036 !expand_check_condition(au->client_condition, au->name,
1037 US"client authenticator")))
1039 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1041 (au->client)? "client_condition is false" :
1042 "not configured as a client");
1046 /* Loop to scan supported server mechanisms */
1051 int len = Ustrlen(au->public_name);
1052 while (isspace(*p)) p++;
1054 if (strncmpic(au->public_name, p, len) != 0 ||
1055 (p[len] != 0 && !isspace(p[len])))
1057 while (*p != 0 && !isspace(*p)) p++;
1061 /* Found data for a listed mechanism. Call its client entry. Set
1062 a flag in the outblock so that data is overwritten after sending so
1063 that reflections don't show it. */
1065 fail_reason = US"authentication attempt(s) failed";
1066 obp->authenticating = TRUE;
1067 rc = (au->info->clientcode)(au, ibp, obp,
1068 ob->command_timeout, buffer, bufsize);
1069 obp->authenticating = FALSE;
1070 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1073 /* A temporary authentication failure must hold up delivery to
1074 this host. After a permanent authentication failure, we carry on
1075 to try other authentication methods. If all fail hard, try to
1076 deliver the message unauthenticated unless require_auth was set. */
1081 smtp_authenticated = TRUE; /* stops the outer loop */
1082 client_authenticator = au->name;
1083 if (au->set_client_id != NULL)
1084 client_authenticated_id = expand_string(au->set_client_id);
1087 /* Failure after writing a command */
1092 /* Failure after reading a response */
1095 if (errno != 0 || buffer[0] != '5') return FAIL;
1096 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1097 au->name, host->name, host->address, buffer);
1100 /* Failure by some other means. In effect, the authenticator
1101 decided it wasn't prepared to handle this case. Typically this
1102 is the result of "fail" in an expansion string. Do we need to
1103 log anything here? Feb 2006: a message is now put in the buffer
1104 if logging is required. */
1108 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1109 "authentication H=%s [%s] %s", au->name, host->name,
1110 host->address, buffer);
1113 /* Internal problem, message in buffer. */
1116 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1121 break; /* If not authenticated, try next authenticator */
1122 } /* Loop for scanning supported server mechanisms */
1123 } /* Loop for further authenticators */
1127 /* If we haven't authenticated, but are required to, give up. */
1129 if (require_auth == OK && !smtp_authenticated)
1131 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1132 string_sprintf("authentication required but %s", fail_reason), DEFER,
1141 /* Construct AUTH appendix string for MAIL TO */
1144 buffer to build string
1145 addrlist chain of potential addresses to deliver
1146 ob transport options
1148 Globals smtp_authenticated
1149 client_authenticated_sender
1150 Return True on error, otherwise buffer has (possibly empty) terminated string
1154 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1155 smtp_transport_options_block *ob)
1157 uschar *local_authenticated_sender = authenticated_sender;
1160 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1163 if (ob->authenticated_sender != NULL)
1165 uschar *new = expand_string(ob->authenticated_sender);
1168 if (!expand_string_forcedfail)
1170 uschar *message = string_sprintf("failed to expand "
1171 "authenticated_sender: %s", expand_string_message);
1172 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1176 else if (new[0] != 0) local_authenticated_sender = new;
1179 /* Add the authenticated sender address if present */
1181 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1182 local_authenticated_sender != NULL)
1184 string_format(buffer, bufsize, " AUTH=%s",
1185 auth_xtextencode(local_authenticated_sender,
1186 Ustrlen(local_authenticated_sender)));
1187 client_authenticated_sender = string_copy(local_authenticated_sender);
1197 #ifdef EXPERIMENTAL_DANE
1198 /* Lookup TLSA record for host/port.
1199 Return: OK success with dnssec; DANE mode
1200 DEFER Do not use this host now, may retry later
1201 FAIL_FORCED No TLSA record; DANE not usable
1202 FAIL Do not use this connection
1206 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1208 /* move this out to host.c given the similarity to dns_lookup() ? */
1210 const uschar * fullname = buffer;
1212 /* TLSA lookup string */
1213 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1215 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1218 if (!dns_is_secure(dnsa))
1220 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1226 return DEFER; /* just defer this TLS'd conn */
1228 case DNS_NODATA: /* no TLSA RR for this lookup */
1229 case DNS_NOMATCH: /* no records at all for this lookup */
1230 return dane_required ? FAIL : FAIL_FORCED;
1234 return dane_required ? FAIL : DEFER;
1241 typedef struct smtp_compare_s
1243 uschar *current_sender_address;
1244 struct transport_instance *tblock;
1248 Create a unique string that identifies this message, it is based on
1249 sender_address, helo_data and tls_certificate if enabled. */
1252 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1254 address_item * addr1;
1255 uschar * if1 = US"";
1256 uschar * helo1 = US"";
1258 uschar * tlsc1 = US"";
1260 uschar * save_sender_address = sender_address;
1261 uschar * local_identity = NULL;
1262 smtp_transport_options_block * ob =
1263 (smtp_transport_options_block *)tblock->options_block;
1265 sender_address = sender;
1267 addr1 = deliver_make_addr (sender, TRUE);
1268 deliver_set_expansions(addr1);
1271 if1 = expand_string(ob->interface);
1274 helo1 = expand_string(ob->helo_data);
1277 if (ob->tls_certificate)
1278 tlsc1 = expand_string(ob->tls_certificate);
1279 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1281 local_identity = string_sprintf ("%s^%s", if1, helo1);
1284 deliver_set_expansions(NULL);
1285 sender_address = save_sender_address;
1287 return local_identity;
1292 /* This routine is a callback that is called from transport_check_waiting.
1293 This function will evaluate the incoming message versus the previous
1294 message. If the incoming message is using a different local identity then
1295 we will veto this new message. */
1298 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1300 uschar * message_local_identity,
1301 * current_local_identity,
1302 * new_sender_address;
1304 current_local_identity =
1305 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1307 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1310 message_local_identity =
1311 smtp_local_identity(new_sender_address, s_compare->tblock);
1313 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1319 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1322 if ( checks & PEER_OFFERED_TLS
1323 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_TLS;
1327 if ( checks & PEER_OFFERED_IGNQ
1328 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1329 PCRE_EOPT, NULL, 0) < 0)
1330 checks &= ~PEER_OFFERED_IGNQ;
1332 if ( checks & PEER_OFFERED_CHUNKING
1333 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_CHUNKING;
1336 #ifndef DISABLE_PRDR
1337 if ( checks & PEER_OFFERED_PRDR
1338 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~PEER_OFFERED_PRDR;
1343 if ( checks & PEER_OFFERED_UTF8
1344 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_UTF8;
1348 if ( checks & PEER_OFFERED_DSN
1349 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_DSN;
1352 if ( checks & PEER_OFFERED_PIPE
1353 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1354 PCRE_EOPT, NULL, 0) < 0)
1355 checks &= ~PEER_OFFERED_PIPE;
1357 if ( checks & PEER_OFFERED_SIZE
1358 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~PEER_OFFERED_SIZE;
1366 /* Callback for emitting a BDAT data chunk header.
1368 If given a nonzero size, first flush any buffered SMTP commands
1369 then emit the command.
1371 Reap previous SMTP command responses if requested.
1372 Reap one SMTP command response if requested.
1374 Returns: OK or ERROR
1378 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1379 unsigned chunk_size, unsigned flags)
1381 smtp_transport_options_block * ob =
1382 (smtp_transport_options_block *)(tctx->tblock->options_block);
1385 uschar * buffer = tctx->buffer;
1388 /* Write SMTP chunk header command */
1391 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1393 flags & tc_chunk_last ? " LAST" : "")
1394 ) < 0) return ERROR;
1396 prev_cmd_count = cmd_count += tctx->cmd_count;
1398 /* Reap responses for any previous, but not one we just emitted */
1402 if (tctx->pending_BDAT)
1405 if (flags & tc_reap_prev && prev_cmd_count > 0)
1407 DEBUG(D_transport) debug_printf("look for %d responses"
1408 " for previous pipelined cmds\n", prev_cmd_count);
1410 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1411 tctx->sync_addr, tctx->host, prev_cmd_count,
1412 ob->address_retry_include_sender,
1413 tctx->pending_MAIL, 0,
1415 ob->command_timeout,
1416 buffer, DELIVER_BUFFER_SIZE))
1418 case 1: /* 2xx (only) => OK */
1419 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1420 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1421 case 0: break; /* No 2xx or 5xx, but no probs */
1423 case -1: /* Timeout on RCPT */
1424 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1427 if (!tctx->pending_BDAT)
1428 pipelining_active = FALSE;
1431 /* Reap response for an outstanding BDAT */
1433 if (tctx->pending_BDAT)
1435 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1437 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1438 ob->command_timeout))
1440 if (errno == 0 && buffer[0] == '4')
1442 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1443 tctx->first_addr->more_errno |=
1444 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1449 tctx->pending_BDAT = FALSE;
1450 pipelining_active = FALSE;
1452 else if (chunk_size > 0)
1453 tctx->pending_BDAT = TRUE;
1456 tctx->cmd_count = cmd_count;
1462 /*************************************************
1463 * Deliver address list to given host *
1464 *************************************************/
1466 /* If continue_hostname is not null, we get here only when continuing to
1467 deliver down an existing channel. The channel was passed as the standard
1468 input. TLS is never active on a passed channel; the previous process always
1469 closes it down before passing the connection on.
1471 Otherwise, we have to make a connection to the remote host, and do the
1472 initial protocol exchange.
1474 When running as an MUA wrapper, if the sender or any recipient is rejected,
1475 temporarily or permanently, we force failure for all recipients.
1478 addrlist chain of potential addresses to deliver; only those whose
1479 transport_return field is set to PENDING_DEFER are currently
1480 being processed; others should be skipped - they have either
1481 been delivered to an earlier host or IP address, or been
1482 failed by one of them.
1483 host host to deliver to
1484 host_af AF_INET or AF_INET6
1485 port default TCP/IP port to use, in host byte order
1486 interface interface to bind to, or NULL
1487 tblock transport instance block
1488 message_defer set TRUE if yield is OK, but all addresses were deferred
1489 because of a non-recipient, non-host failure, that is, a
1490 4xx response to MAIL FROM, DATA, or ".". This is a defer
1491 that is specific to the message.
1492 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1493 a second attempt after TLS initialization fails
1495 Returns: OK - the connection was made and the delivery attempted;
1496 the result for each address is in its data block.
1497 DEFER - the connection could not be made, or something failed
1498 while setting up the SMTP session, or there was a
1499 non-message-specific error, such as a timeout.
1500 ERROR - a filter command is specified for this transport,
1501 and there was a problem setting it up; OR helo_data
1502 or add_headers or authenticated_sender is specified
1503 for this transport, and the string failed to expand
1507 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1508 uschar *interface, transport_instance *tblock,
1509 BOOL *message_defer, BOOL suppress_tls)
1512 address_item *sync_addr;
1513 address_item *first_addr = addrlist;
1518 time_t start_delivery_time = time(NULL);
1519 smtp_transport_options_block *ob =
1520 (smtp_transport_options_block *)(tblock->options_block);
1530 BOOL pending_MAIL:1;
1531 #ifndef DISABLE_PRDR
1537 BOOL dsn_all_lasthop:1;
1538 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1540 BOOL dane_required:1;
1544 BOOL pass_message = FALSE;
1545 BOOL completed_address = FALSE;
1546 uschar peer_offered = 0;
1547 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1548 dns_answer tlsa_dnsa;
1550 smtp_inblock inblock;
1551 smtp_outblock outblock;
1552 int max_rcpt = tblock->max_addresses;
1553 uschar *igquotstr = US"";
1555 #ifdef EXPERIMENTAL_DSN_INFO
1556 uschar *smtp_greeting = NULL;
1557 uschar *helo_response = NULL;
1559 uschar *helo_data = NULL;
1561 uschar *message = NULL;
1562 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1564 uschar buffer[DELIVER_BUFFER_SIZE];
1565 uschar inbuffer[4096];
1566 uschar outbuffer[4096];
1568 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1570 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1571 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1573 lflags.send_rset = TRUE;
1574 lflags.send_quit = TRUE;
1575 lflags.setting_up = TRUE;
1576 lflags.esmtp = TRUE;
1577 lflags.esmtp_sent = FALSE;
1579 lflags.utf8_needed = FALSE;
1581 lflags.dsn_all_lasthop = TRUE;
1582 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1583 lflags.dane = FALSE;
1584 lflags.dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1587 *message_defer = FALSE;
1588 smtp_command = US"initial connection";
1590 if (max_rcpt == 0) max_rcpt = 999999;
1592 /* Set up the buffer for reading SMTP response packets. */
1594 inblock.buffer = inbuffer;
1595 inblock.buffersize = sizeof(inbuffer);
1596 inblock.ptr = inbuffer;
1597 inblock.ptrend = inbuffer;
1599 /* Set up the buffer for holding SMTP commands while pipelining */
1601 outblock.buffer = outbuffer;
1602 outblock.buffersize = sizeof(outbuffer);
1603 outblock.ptr = outbuffer;
1604 outblock.cmd_count = 0;
1605 outblock.authenticating = FALSE;
1607 /* Reset the parameters of a TLS session. */
1610 tls_out.cipher = NULL; /* the one we may use for this transport */
1611 tls_out.ourcert = NULL;
1612 tls_out.peercert = NULL;
1613 tls_out.peerdn = NULL;
1614 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1617 tls_out.ocsp = OCSP_NOT_REQ;
1619 /* Flip the legacy TLS-related variables over to the outbound set in case
1620 they're used in the context of the transport. Don't bother resetting
1621 afterward as we're in a subprocess. */
1623 tls_modify_variables(&tls_out);
1628 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1634 /* Make a connection to the host if this isn't a continued delivery, and handle
1635 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1636 specially so they can be identified for retries. */
1638 if (continue_hostname == NULL)
1640 /* This puts port into host->port */
1641 inblock.sock = outblock.sock =
1642 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1644 if (inblock.sock < 0)
1646 set_errno_nohost(addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1647 NULL, DEFER, FALSE);
1651 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1653 tls_out.dane_verified = FALSE;
1654 tls_out.tlsa_usage = 0;
1656 if (host->dnssec == DS_YES)
1658 if( lflags.dane_required
1659 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1661 switch (rc = tlsa_lookup(host, &tlsa_dnsa, lflags.dane_required))
1663 case OK: lflags.dane = TRUE; break;
1664 case FAIL_FORCED: break;
1665 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1666 string_sprintf("DANE error: tlsa lookup %s",
1667 rc == DEFER ? "DEFER" : "FAIL"),
1672 else if (lflags.dane_required)
1674 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1675 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1681 ob->tls_tempfail_tryclear = FALSE;
1685 /* Expand the greeting message while waiting for the initial response. (Makes
1686 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1687 delayed till here so that $sending_interface and $sending_port are set. */
1689 helo_data = expand_string(ob->helo_data);
1693 uschar * errstr = NULL;
1694 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1696 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1697 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1704 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1705 is nevertheless a reasonably clean way of programming this kind of logic,
1706 where you want to escape on any error. */
1713 (void) setsockopt(inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1715 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1716 '2', ob->command_timeout);
1717 #ifdef EXPERIMENTAL_DSN_INFO
1718 smtp_greeting = string_copy(buffer);
1720 if (!good_response) goto RESPONSE_FAILED;
1722 #ifndef DISABLE_EVENT
1725 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1726 : host->dnssec==DS_NO ? US"no" : NULL;
1727 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1730 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1731 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1739 /* Now check if the helo_data expansion went well, and sign off cleanly if
1744 uschar *message = string_sprintf("failed to expand helo_data: %s",
1745 expand_string_message);
1746 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1752 /** Debugging without sending a message
1753 addrlist->transport_return = DEFER;
1757 /* Errors that occur after this point follow an SMTP command, which is
1758 left in big_buffer by smtp_write_command() for use in error messages. */
1760 smtp_command = big_buffer;
1762 /* Tell the remote who we are...
1764 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1765 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1766 greeting is of this form. The assumption was that the far end supports it
1767 properly... but experience shows that there are some that give 5xx responses,
1768 even though the banner includes "ESMTP" (there's a bloody-minded one that
1769 says "ESMTP not spoken here"). Cope with that case.
1771 September 2000: Time has passed, and it seems reasonable now to always send
1772 EHLO at the start. It is also convenient to make the change while installing
1775 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1776 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1777 would be no way to send out the mails, so there is now a host list
1778 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1779 PIPELINING problem as well. Maybe it can also be useful to cure other
1780 problems with broken servers.
1782 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1783 Then somebody tried it with a Microsoft mailer... It seems that all other
1784 mailers use upper case for some reason (the RFC is quite clear about case
1785 independence) so, for peace of mind, I gave in. */
1787 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1789 /* Alas; be careful, since this goto is not an error-out, so conceivably
1790 we might set data between here and the target which we assume to exist
1791 and be usable. I can see this coming back to bite us. */
1795 smtp_peer_options |= PEER_OFFERED_TLS;
1796 suppress_tls = FALSE;
1797 ob->tls_tempfail_tryclear = FALSE;
1798 smtp_command = US"SSL-on-connect";
1805 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1806 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1808 lflags.esmtp_sent = TRUE;
1809 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1810 ob->command_timeout))
1812 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1814 #ifdef EXPERIMENTAL_DSN_INFO
1815 helo_response = string_copy(buffer);
1817 goto RESPONSE_FAILED;
1819 lflags.esmtp = FALSE;
1821 #ifdef EXPERIMENTAL_DSN_INFO
1822 helo_response = string_copy(buffer);
1827 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1832 int n = sizeof(buffer);
1833 uschar * rsp = buffer;
1835 if (lflags.esmtp_sent && (n = Ustrlen(buffer)) < sizeof(buffer)/2)
1836 { rsp = buffer + n + 1; n = sizeof(buffer) - n; }
1838 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1840 good_response = smtp_read_response(&inblock, rsp, n,
1841 '2', ob->command_timeout);
1842 #ifdef EXPERIMENTAL_DSN_INFO
1843 helo_response = string_copy(rsp);
1847 /* Handle special logging for a closed connection after HELO
1848 when had previously sent EHLO */
1850 if (rsp != buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1853 lflags.send_quit = FALSE;
1854 save_errno = ERRNO_SMTPCLOSED;
1855 message = string_sprintf("Remote host closed connection "
1856 "in response to %s (EHLO response was: %s)",
1857 smtp_command, buffer);
1860 Ustrncpy(buffer, rsp, sizeof(buffer)/2);
1861 goto RESPONSE_FAILED;
1865 peer_offered = smtp_peer_options = 0;
1867 if (lflags.esmtp || lflags.lmtp)
1869 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1870 PEER_OFFERED_TLS /* others checked later */
1873 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1876 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1881 /* For continuing deliveries down the same channel, the socket is the standard
1882 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1883 below). Set up the pointer to where subsequent commands will be left, for
1884 error messages. Note that smtp_peer_options will have been
1885 set from the command line if they were set in the process that passed the
1888 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1889 as the contine goes via transport_pass_socket() and doublefork and exec.
1890 It does not wait. Unclear how we keep separate host's responses
1891 separate - we could match up by host ip+port as a bodge. */
1895 inblock.sock = outblock.sock = fileno(stdin);
1896 smtp_command = big_buffer;
1897 host->port = port; /* Record the port that was used */
1900 /* If TLS is available on this connection, whether continued or not, attempt to
1901 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1902 send another EHLO - the server may give a different answer in secure mode. We
1903 use a separate buffer for reading the response to STARTTLS so that if it is
1904 negative, the original EHLO data is available for subsequent analysis, should
1905 the client not be required to use TLS. If the response is bad, copy the buffer
1906 for error analysis. */
1909 if ( smtp_peer_options & PEER_OFFERED_TLS
1911 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1913 uschar buffer2[4096];
1914 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1917 /* If there is an I/O error, transmission of this message is deferred. If
1918 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1919 false, we also defer. However, if there is a temporary rejection of STARTTLS
1920 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1921 STARTTLS, we carry on. This means we will try to send the message in clear,
1922 unless the host is in hosts_require_tls (tested below). */
1924 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1925 ob->command_timeout))
1929 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1932 Ustrncpy(buffer, buffer2, sizeof(buffer));
1933 goto RESPONSE_FAILED;
1937 /* STARTTLS accepted: try to negotiate a TLS session. */
1942 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1943 # ifdef EXPERIMENTAL_DANE
1944 , lflags.dane ? &tlsa_dnsa : NULL
1948 /* TLS negotiation failed; give an error. From outside, this function may
1949 be called again to try in clear on a new connection, if the options permit
1950 it for this host. */
1954 # ifdef EXPERIMENTAL_DANE
1955 if (lflags.dane) log_write(0, LOG_MAIN,
1956 "DANE attempt failed; no TLS connection to %s [%s]",
1957 host->name, host->address);
1960 save_errno = ERRNO_TLSFAILURE;
1961 message = US"failure while setting up TLS session";
1962 lflags.send_quit = FALSE;
1966 /* TLS session is set up */
1968 smtp_peer_options_wrap = smtp_peer_options;
1969 for (addr = addrlist; addr; addr = addr->next)
1970 if (addr->transport_return == PENDING_DEFER)
1972 addr->cipher = tls_out.cipher;
1973 addr->ourcert = tls_out.ourcert;
1974 addr->peercert = tls_out.peercert;
1975 addr->peerdn = tls_out.peerdn;
1976 addr->ocsp = tls_out.ocsp;
1981 /* if smtps, we'll have smtp_command set to something else; always safe to
1983 smtp_command = big_buffer;
1985 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1986 helo_data is null, we are dealing with a connection that was passed from
1987 another process, and so we won't have expanded helo_data above. We have to
1988 expand it here. $sending_ip_address and $sending_port are set up right at the
1989 start of the Exim process (in exim.c). */
1991 if (tls_out.active >= 0)
1996 if (helo_data == NULL)
1998 helo_data = expand_string(ob->helo_data);
1999 if (helo_data == NULL)
2001 uschar *message = string_sprintf("failed to expand helo_data: %s",
2002 expand_string_message);
2003 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2009 /* For SMTPS we need to wait for the initial OK response. */
2012 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2013 '2', ob->command_timeout);
2014 #ifdef EXPERIMENTAL_DSN_INFO
2015 smtp_greeting = string_copy(buffer);
2017 if (!good_response) goto RESPONSE_FAILED;
2021 greeting_cmd = "EHLO";
2024 greeting_cmd = "HELO";
2026 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2029 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
2030 lflags.lmtp ? "LHLO" : greeting_cmd, helo_data) < 0)
2032 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2033 '2', ob->command_timeout);
2034 #ifdef EXPERIMENTAL_DSN_INFO
2035 helo_response = string_copy(buffer);
2037 if (!good_response) goto RESPONSE_FAILED;
2038 smtp_peer_options = 0;
2041 /* If the host is required to use a secure channel, ensure that we
2044 else if ( lflags.smtps
2045 # ifdef EXPERIMENTAL_DANE
2048 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
2051 save_errno = ERRNO_TLSREQUIRED;
2052 message = string_sprintf("a TLS session is required, but %s",
2053 smtp_peer_options & PEER_OFFERED_TLS
2054 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2057 #endif /*SUPPORT_TLS*/
2059 /* If TLS is active, we have just started it up and re-done the EHLO command,
2060 so its response needs to be analyzed. If TLS is not active and this is a
2061 continued session down a previously-used socket, we haven't just done EHLO, so
2064 if (continue_hostname == NULL
2066 || tls_out.active >= 0
2070 if (lflags.esmtp || lflags.lmtp)
2072 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2074 | (lflags.lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2075 | PEER_OFFERED_CHUNKING
2078 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2079 /*XXX if we hand peercaps on to continued-conn processes,
2080 must not depend on this addr */
2084 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2087 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2088 lmtp_ignore_quota option was set. */
2090 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2092 /* If the response to EHLO specified support for the SIZE parameter, note
2093 this, provided size_addition is non-negative. */
2095 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2097 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2098 the current host, esmtp will be false, so PIPELINING can never be used. If
2099 the current host matches hosts_avoid_pipelining, don't do it. */
2101 if ( peer_offered & PEER_OFFERED_PIPE
2102 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2103 smtp_peer_options |= PEER_OFFERED_PIPE;
2105 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2106 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2108 if ( peer_offered & PEER_OFFERED_CHUNKING
2109 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2110 peer_offered &= ~PEER_OFFERED_CHUNKING;
2112 if (peer_offered & PEER_OFFERED_CHUNKING)
2113 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2115 #ifndef DISABLE_PRDR
2116 if ( peer_offered & PEER_OFFERED_PRDR
2117 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2118 peer_offered &= ~PEER_OFFERED_PRDR;
2120 if (peer_offered & PEER_OFFERED_PRDR)
2121 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2124 /* Note if the server supports DSN */
2125 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2126 DEBUG(D_transport) debug_printf("%susing DSN\n",
2127 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2129 /* Note if the response to EHLO specifies support for the AUTH extension.
2130 If it has, check that this host is one we want to authenticate to, and do
2131 the business. The host name and address must be available when the
2132 authenticator's client driver is running. */
2134 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2135 ob, lflags.esmtp, &inblock, &outblock))
2137 default: goto SEND_QUIT;
2139 case FAIL_SEND: goto SEND_FAILED;
2140 case FAIL: goto RESPONSE_FAILED;
2144 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2146 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2147 message-specific. */
2149 lflags.setting_up = FALSE;
2152 if (addrlist->prop.utf8_msg)
2154 lflags.utf8_needed = !addrlist->prop.utf8_downcvt
2155 && !addrlist->prop.utf8_downcvt_maybe;
2156 DEBUG(D_transport) if (!lflags.utf8_needed)
2157 debug_printf("utf8: %s downconvert\n",
2158 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2161 /* If this is an international message we need the host to speak SMTPUTF8 */
2162 if (lflags.utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2164 errno = ERRNO_UTF8_FWD;
2165 goto RESPONSE_FAILED;
2169 /* If there is a filter command specified for this transport, we can now
2170 set it up. This cannot be done until the identify of the host is known. */
2172 if (tblock->filter_command != NULL)
2176 sprintf(CS fbuf, "%.50s transport", tblock->name);
2177 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2178 TRUE, DEFER, addrlist, fbuf, NULL);
2179 transport_filter_timeout = tblock->filter_timeout;
2181 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2186 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2192 if ( transport_filter_argv
2193 && *transport_filter_argv
2194 && **transport_filter_argv
2195 && peer_offered & PEER_OFFERED_CHUNKING
2198 peer_offered &= ~PEER_OFFERED_CHUNKING;
2199 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2204 /* For messages that have more than the maximum number of envelope recipients,
2205 we want to send several transactions down the same SMTP connection. (See
2206 comments in deliver.c as to how this reconciles, heuristically, with
2207 remote_max_parallel.) This optimization was added to Exim after the following
2208 code was already working. The simplest way to put it in without disturbing the
2209 code was to use a goto to jump back to this point when there is another
2210 transaction to handle. */
2213 sync_addr = first_addr;
2216 lflags.send_rset = TRUE;
2217 completed_address = FALSE;
2220 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2221 qualification, send it, adding something to the message size to allow for
2222 imprecision and things that get added en route. Exim keeps the number of lines
2223 in a message, so we can give an accurate value for the original message, but we
2224 need some additional to handle added headers. (Double "." characters don't get
2225 included in the count.) */
2230 if (peer_offered & PEER_OFFERED_SIZE)
2232 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2236 #ifndef DISABLE_PRDR
2237 lflags.prdr_active = FALSE;
2238 if (peer_offered & PEER_OFFERED_PRDR)
2239 for (addr = first_addr; addr; addr = addr->next)
2240 if (addr->transport_return == PENDING_DEFER)
2242 for (addr = addr->next; addr; addr = addr->next)
2243 if (addr->transport_return == PENDING_DEFER)
2244 { /* at least two recipients to send */
2245 lflags.prdr_active = TRUE;
2246 sprintf(CS p, " PRDR"); p += 5;
2254 if ( addrlist->prop.utf8_msg
2255 && !addrlist->prop.utf8_downcvt
2256 && peer_offered & PEER_OFFERED_UTF8
2258 sprintf(CS p, " SMTPUTF8"), p += 9;
2261 /* check if all addresses have lasthop flag */
2262 /* do not send RET and ENVID if true */
2263 for (lflags.dsn_all_lasthop = TRUE, addr = first_addr;
2264 address_count < max_rcpt && addr != NULL;
2266 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2268 lflags.dsn_all_lasthop = FALSE;
2272 /* Add any DSN flags to the mail command */
2274 if (peer_offered & PEER_OFFERED_DSN && !lflags.dsn_all_lasthop)
2276 if (dsn_ret == dsn_ret_hdrs)
2277 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2278 else if (dsn_ret == dsn_ret_full)
2279 { Ustrcpy(p, " RET=FULL"); p += 9; }
2283 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2288 /* If an authenticated_sender override has been specified for this transport
2289 instance, expand it. If the expansion is forced to fail, and there was already
2290 an authenticated_sender for this message, the original value will be used.
2291 Other expansion failures are serious. An empty result is ignored, but there is
2292 otherwise no check - this feature is expected to be used with LMTP and other
2293 cases where non-standard addresses (e.g. without domains) might be required. */
2295 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2301 /* From here until we send the DATA command, we can make use of PIPELINING
2302 if the server host supports it. The code has to be able to check the responses
2303 at any point, for when the buffer fills up, so we write it totally generally.
2304 When PIPELINING is off, each command written reports that it has flushed the
2307 lflags.pending_MAIL = TRUE; /* The block starts with MAIL */
2310 uschar * s = return_path;
2312 uschar * errstr = NULL;
2314 /* If we must downconvert, do the from-address here. Remember we had to
2315 for the to-addresses (done below), and also (ugly) for re-doing when building
2316 the delivery log line. */
2318 if ( addrlist->prop.utf8_msg
2319 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2322 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2324 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2328 setflag(addrlist, af_utf8_downcvt);
2332 rc = smtp_write_command(&outblock, pipelining_active,
2333 "MAIL FROM:<%s>%s\r\n", s, buffer);
2336 mail_command = string_copy(big_buffer); /* Save for later error message */
2340 case -1: /* Transmission error */
2343 case +1: /* Block was sent */
2344 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2345 ob->command_timeout))
2347 if (errno == 0 && buffer[0] == '4')
2349 errno = ERRNO_MAIL4XX;
2350 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2352 goto RESPONSE_FAILED;
2354 lflags.pending_MAIL = FALSE;
2358 /* Pass over all the relevant recipient addresses for this host, which are the
2359 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2360 several before we have to read the responses for those seen so far. This
2361 checking is done by a subroutine because it also needs to be done at the end.
2362 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2363 the next one if not all are sent.
2365 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2366 last address because we want to abort if any recipients have any kind of
2367 problem, temporary or permanent. We know that all recipient addresses will have
2368 the PENDING_DEFER status, because only one attempt is ever made, and we know
2369 that max_rcpt will be large, so all addresses will be done at once. */
2371 for (addr = first_addr;
2372 addr && address_count < max_rcpt;
2374 if (addr->transport_return == PENDING_DEFER)
2380 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2381 ? dsn_support_yes : dsn_support_no;
2384 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2386 /* Add any DSN flags to the rcpt command and add to the sent string */
2391 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2393 if (addr->dsn_flags & rf_dsnflags)
2397 Ustrcpy(p, " NOTIFY=");
2399 for (i = 0; i < 4; i++)
2400 if ((addr->dsn_flags & rf_list[i]) != 0)
2402 if (!first) *p++ = ',';
2404 Ustrcpy(p, rf_names[i]);
2409 if (addr->dsn_orcpt)
2411 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2417 /* Now send the RCPT command, and process outstanding responses when
2418 necessary. After a timeout on RCPT, we just end the function, leaving the
2419 yield as OK, because this error can often mean that there is a problem with
2420 just one address, so we don't want to delay the host. */
2422 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2426 uschar * dummy_errstr;
2427 if ( testflag(addrlist, af_utf8_downcvt)
2428 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2432 errno = ERRNO_EXPANDFAIL;
2438 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2439 rcpt_addr, igquotstr, buffer);
2441 if (count < 0) goto SEND_FAILED;
2444 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2445 &sync_addr, host, count, ob->address_retry_include_sender,
2446 lflags.pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2449 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2450 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2453 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2454 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2455 case 0: /* No 2xx or 5xx, but no probs */
2458 case -1: goto END_OFF; /* Timeout on RCPT */
2459 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2461 lflags.pending_MAIL = FALSE; /* Dealt with MAIL */
2463 } /* Loop for next address */
2465 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2466 permanently or temporarily. We should have flushed and synced after the last
2471 address_item *badaddr;
2472 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2473 if (badaddr->transport_return != PENDING_OK)
2475 /*XXX could we find a better errno than 0 here? */
2476 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2477 testflag(badaddr, af_pass_message));
2483 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2484 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2485 have a good recipient buffered up if we are pipelining. We don't want to waste
2486 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2487 are pipelining. The responses are all handled by sync_responses().
2488 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2491 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2492 && (lflags.ok || (pipelining_active && !mua_wrapper)))
2494 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2496 if (count < 0) goto SEND_FAILED;
2497 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2498 host, count, ob->address_retry_include_sender, lflags.pending_MAIL,
2499 lflags.ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2501 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2502 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2505 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2506 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2507 case 0: break; /* No 2xx or 5xx, but no probs */
2509 case -1: goto END_OFF; /* Timeout on RCPT */
2510 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2512 pipelining_active = FALSE;
2515 /* If there were no good recipients (but otherwise there have been no
2516 problems), just set ok TRUE, since we have handled address-specific errors
2517 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2518 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2519 well as body. Set the appropriate timeout value to be used for each chunk.
2520 (Haven't been able to make it work using select() for writing yet.) */
2522 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !lflags.ok)
2524 /* Save the first address of the next batch. */
2531 transport_ctx tctx = {
2534 US".", US"..", /* Escaping strings */
2535 topt_use_crlf | topt_escape_headers
2536 | (tblock->body_only ? topt_no_headers : 0)
2537 | (tblock->headers_only ? topt_no_body : 0)
2538 | (tblock->return_path_add ? topt_add_return_path : 0)
2539 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2540 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2543 /* If using CHUNKING we need a callback from the generic transport
2544 support to us, for the sending of BDAT smtp commands and the reaping
2545 of responses. The callback needs a whole bunch of state so set up
2546 a transport-context structure to be passed around. */
2548 if (peer_offered & PEER_OFFERED_CHUNKING)
2550 tctx.check_string = tctx.escape_string = NULL;
2551 tctx.options |= topt_use_bdat;
2552 tctx.chunk_cb = smtp_chunk_cmd_callback;
2553 tctx.inblock = &inblock;
2554 tctx.outblock = &outblock;
2556 tctx.first_addr = first_addr;
2557 tctx.sync_addr = &sync_addr;
2558 tctx.pending_MAIL = lflags.pending_MAIL;
2559 tctx.pending_BDAT = FALSE;
2560 tctx.good_RCPT = lflags.ok;
2561 tctx.completed_address = &completed_address;
2563 tctx.buffer = buffer;
2566 tctx.options |= topt_end_dot;
2568 /* Save the first address of the next batch. */
2571 /* Responses from CHUNKING commands go in buffer. Otherwise,
2572 there has not been a response. */
2576 sigalrm_seen = FALSE;
2577 transport_write_timeout = ob->data_timeout;
2578 smtp_command = US"sending data block"; /* For error messages */
2579 DEBUG(D_transport|D_v)
2580 if (peer_offered & PEER_OFFERED_CHUNKING)
2581 debug_printf(" will write message using CHUNKING\n");
2583 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2584 transport_count = 0;
2586 #ifndef DISABLE_DKIM
2587 lflags.ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2589 lflags.ok = transport_write_message(inblock.sock, &tctx, 0);
2592 /* transport_write_message() uses write() because it is called from other
2593 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2594 it can exit with "Broken pipe" as its error. This really means that the
2595 socket got closed at the far end. */
2597 transport_write_timeout = 0; /* for subsequent transports */
2599 /* Failure can either be some kind of I/O disaster (including timeout),
2600 or the failure of a transport filter or the expansion of added headers.
2601 Or, when CHUNKING, it can be a protocol-detected failure. */
2604 goto RESPONSE_FAILED;
2606 /* We used to send the terminating "." explicitly here, but because of
2607 buffering effects at both ends of TCP/IP connections, you don't gain
2608 anything by keeping it separate, so it might as well go in the final
2609 data buffer for efficiency. This is now done by setting the topt_end_dot
2612 smtp_command = US"end of data";
2614 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2616 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2617 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2618 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2619 lflags.pending_MAIL, 0,
2620 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2622 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2623 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2626 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2627 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2628 case 0: break; /* No 2xx or 5xx, but no probs */
2630 case -1: goto END_OFF; /* Timeout on RCPT */
2631 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2635 #ifndef DISABLE_PRDR
2636 /* For PRDR we optionally get a partial-responses warning
2637 * followed by the individual responses, before going on with
2638 * the overall response. If we don't get the warning then deal
2639 * with per non-PRDR. */
2640 if(lflags.prdr_active)
2642 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2644 if (!lflags.ok && errno == 0) switch(buffer[0])
2646 case '2': lflags.prdr_active = FALSE;
2649 case '4': errno = ERRNO_DATA4XX;
2650 addrlist->more_errno |=
2651 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2658 /* For non-PRDR SMTP, we now read a single response that applies to the
2659 whole message. If it is OK, then all the addresses have been delivered. */
2663 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2665 if (!lflags.ok && errno == 0 && buffer[0] == '4')
2667 errno = ERRNO_DATA4XX;
2668 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2672 /* For LMTP, we get back a response for every RCPT command that we sent;
2673 some may be accepted and some rejected. For those that get a response, their
2674 status is fixed; any that are accepted have been handed over, even if later
2675 responses crash - at least, that's how I read RFC 2033.
2677 If all went well, mark the recipient addresses as completed, record which
2678 host/IPaddress they were delivered to, and cut out RSET when sending another
2679 message down the same channel. Write the completed addresses to the journal
2680 now so that they are recorded in case there is a crash of hardware or
2681 software before the spool gets updated. Also record the final SMTP
2682 confirmation if needed (for SMTP only). */
2687 int delivery_time = (int)(time(NULL) - start_delivery_time);
2689 uschar *conf = NULL;
2691 lflags.send_rset = FALSE;
2692 pipelining_active = FALSE;
2694 /* Set up confirmation if needed - applies only to SMTP */
2697 #ifdef DISABLE_EVENT
2698 LOGGING(smtp_confirmation) &&
2703 const uschar *s = string_printing(buffer);
2704 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2705 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2708 /* Process all transported addresses - for LMTP or PRDR, read a status for
2711 for (addr = addrlist; addr != first_addr; addr = addr->next)
2713 if (addr->transport_return != PENDING_OK) continue;
2715 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2716 remaining addresses. Otherwise, it's a return code for just the one
2717 address. For temporary errors, add a retry item for the address so that
2718 it doesn't get tried again too soon. */
2720 #ifndef DISABLE_PRDR
2721 if (lflags.lmtp || lflags.prdr_active)
2726 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2729 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2730 addr->message = string_sprintf(
2731 #ifndef DISABLE_PRDR
2732 "%s error after %s: %s", lflags.prdr_active ? "PRDR":"LMTP",
2734 "LMTP error after %s: %s",
2736 big_buffer, string_printing(buffer));
2737 setflag(addr, af_pass_message); /* Allow message to go to user */
2738 if (buffer[0] == '5')
2739 addr->transport_return = FAIL;
2742 errno = ERRNO_DATA4XX;
2743 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2744 addr->transport_return = DEFER;
2745 #ifndef DISABLE_PRDR
2746 if (!lflags.prdr_active)
2748 retry_add_item(addr, addr->address_retry_key, 0);
2752 completed_address = TRUE; /* NOW we can set this flag */
2753 if (LOGGING(smtp_confirmation))
2755 const uschar *s = string_printing(buffer);
2756 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2757 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2761 /* SMTP, or success return from LMTP for this address. Pass back the
2762 actual host that was used. */
2764 addr->transport_return = OK;
2765 addr->more_errno = delivery_time;
2766 addr->host_used = host;
2767 addr->special_action = flag;
2768 addr->message = conf;
2769 #ifndef DISABLE_PRDR
2770 if (lflags.prdr_active) addr->flags |= af_prdr_used;
2772 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2775 #ifndef DISABLE_PRDR
2776 if (!lflags.prdr_active)
2779 /* Update the journal. For homonymic addresses, use the base address plus
2780 the transport name. See lots of comments in deliver.c about the reasons
2781 for the complications when homonyms are involved. Just carry on after
2782 write error, as it may prove possible to update the spool file later. */
2784 if (testflag(addr, af_homonym))
2785 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2787 sprintf(CS buffer, "%.500s\n", addr->unique);
2789 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2790 len = Ustrlen(CS buffer);
2791 if (write(journal_fd, buffer, len) != len)
2792 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2793 "%s: %s", buffer, strerror(errno));
2797 #ifndef DISABLE_PRDR
2798 if (lflags.prdr_active)
2800 /* PRDR - get the final, overall response. For any non-success
2801 upgrade all the address statuses. */
2802 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2806 if(errno == 0 && buffer[0] == '4')
2808 errno = ERRNO_DATA4XX;
2809 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2811 for (addr = addrlist; addr != first_addr; addr = addr->next)
2812 if (buffer[0] == '5' || addr->transport_return == OK)
2813 addr->transport_return = PENDING_OK; /* allow set_errno action */
2814 goto RESPONSE_FAILED;
2817 /* Update the journal, or setup retry. */
2818 for (addr = addrlist; addr != first_addr; addr = addr->next)
2819 if (addr->transport_return == OK)
2821 if (testflag(addr, af_homonym))
2822 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2824 sprintf(CS buffer, "%.500s\n", addr->unique);
2826 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2827 len = Ustrlen(CS buffer);
2828 if (write(journal_fd, buffer, len) != len)
2829 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2830 "%s: %s", buffer, strerror(errno));
2832 else if (addr->transport_return == DEFER)
2833 retry_add_item(addr, addr->address_retry_key, -2);
2837 /* Ensure the journal file is pushed out to disk. */
2839 if (EXIMfsync(journal_fd) < 0)
2840 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2846 /* Handle general (not specific to one address) failures here. The value of ok
2847 is used to skip over this code on the falling through case. A timeout causes a
2848 deferral. Other errors may defer or fail according to the response code, and
2849 may set up a special errno value, e.g. after connection chopped, which is
2850 assumed if errno == 0 and there is no text in the buffer. If control reaches
2851 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2852 the problem is not related to this specific message. */
2857 uschar * set_message;
2863 lflags.send_quit = check_response(host, &save_errno, addrlist->more_errno,
2864 buffer, &code, &message, &pass_message);
2872 message = US string_sprintf("send() to %s [%s] failed: %s",
2873 host->name, host->address, strerror(save_errno));
2874 lflags.send_quit = FALSE;
2878 /* This label is jumped to directly when a TLS negotiation has failed,
2879 or was not done for a host for which it is required. Values will be set
2880 in message and save_errno, and setting_up will always be true. Treat as
2881 a temporary error. */
2888 /* If the failure happened while setting up the call, see if the failure was
2889 a 5xx response (this will either be on connection, or following HELO - a 5xx
2890 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2891 never going to accept them. For other errors during setting up (timeouts or
2892 whatever), defer all addresses, and yield DEFER, so that the host is not
2893 tried again for a while. */
2896 lflags.ok = FALSE; /* For when reached by GOTO */
2897 set_message = message;
2899 if (lflags.setting_up)
2903 yield = set_rc = DEFER;
2905 /* We want to handle timeouts after MAIL or "." and loss of connection after
2906 "." specially. They can indicate a problem with the sender address or with
2907 the contents of the message rather than a real error on the connection. These
2908 cases are treated in the same way as a 4xx response. This next bit of code
2909 does the classification. */
2918 case ERRNO_UTF8_FWD:
2925 message_error = TRUE;
2929 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2930 Ustrncmp(smtp_command,"end ",4) == 0;
2933 case ERRNO_SMTPCLOSED:
2934 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2938 message_error = FALSE;
2942 /* Handle the cases that are treated as message errors. These are:
2944 (a) negative response or timeout after MAIL
2945 (b) negative response after DATA
2946 (c) negative response or timeout or dropped connection after "."
2947 (d) utf8 support required and not offered
2949 It won't be a negative response or timeout after RCPT, as that is dealt
2950 with separately above. The action in all cases is to set an appropriate
2951 error code for all the addresses, but to leave yield set to OK because the
2952 host itself has not failed. Of course, it might in practice have failed
2953 when we've had a timeout, but if so, we'll discover that at the next
2954 delivery attempt. For a temporary error, set the message_defer flag, and
2955 write to the logs for information if this is not the last host. The error
2956 for the last host will be logged as part of the address's log line. */
2960 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2962 /* If there's an errno, the message contains just the identity of
2967 else /* Anything other than 5 is treated as temporary */
2971 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2972 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2973 msglog_line(host, message);
2974 *message_defer = TRUE;
2978 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2979 ".", or some other transportation error. We defer all addresses and yield
2980 DEFER, except for the case of failed add_headers expansion, or a transport
2981 filter failure, when the yield should be ERROR, to stop it trying other
2987 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2988 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2992 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2993 #ifdef EXPERIMENTAL_DSN_INFO
2994 , smtp_greeting, helo_response
3000 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3001 SMTP session tidily. However, if there were too many addresses to send in one
3002 message (indicated by first_addr being non-NULL) we want to carry on with the
3003 rest of them. Also, it is desirable to send more than one message down the SMTP
3004 connection if there are several waiting, provided we haven't already sent so
3005 many as to hit the configured limit. The function transport_check_waiting looks
3006 for a waiting message and returns its id. Then transport_pass_socket tries to
3007 set up a continued delivery by passing the socket on to another process. The
3008 variable send_rset is FALSE if a message has just been successfully transfered.
3010 If we are already sending down a continued channel, there may be further
3011 addresses not yet delivered that are aimed at the same host, but which have not
3012 been passed in this run of the transport. In this case, continue_more will be
3013 true, and all we should do is send RSET if necessary, and return, leaving the
3016 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3017 do not want to continue with other messages down the same channel, because that
3018 can lead to looping between two or more messages, all with the same,
3019 temporarily failing address(es). [The retry information isn't updated yet, so
3020 new processes keep on trying.] We probably also don't want to try more of this
3021 message's addresses either.
3023 If we have started a TLS session, we have to end it before passing the
3024 connection to a new process. However, not all servers can handle this (Exim
3025 can), so we do not pass such a connection on if the host matches
3026 hosts_nopass_tls. */
3029 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3030 "yield=%d first_address is %sNULL\n", lflags.ok, lflags.send_quit,
3031 lflags.send_rset, continue_more, yield, first_addr ? "not " : "");
3033 if (completed_address && lflags.ok && lflags.send_quit)
3036 smtp_compare_t t_compare;
3038 t_compare.tblock = tblock;
3039 t_compare.current_sender_address = sender_address;
3041 if ( first_addr != NULL
3043 || ( ( tls_out.active < 0
3044 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
3047 transport_check_waiting(tblock->name, host->name,
3048 tblock->connection_max_messages, new_message_id, &more,
3049 (oicf)smtp_are_same_identities, (void*)&t_compare)
3055 if (lflags.send_rset)
3057 if (! (lflags.ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3059 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3060 host->address, strerror(save_errno));
3061 lflags.send_quit = FALSE;
3063 else if (! (lflags.ok = smtp_read_response(&inblock, buffer,
3064 sizeof(buffer), '2', ob->command_timeout)))
3067 lflags.send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3069 if (!lflags.send_quit)
3071 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3072 host->name, host->address, msg);
3077 /* Either RSET was not needed, or it succeeded */
3081 if (first_addr != NULL) /* More addresses still to be sent */
3082 { /* in this run of the transport */
3083 continue_sequence++; /* Causes * in logging */
3086 if (continue_more) return yield; /* More addresses for another run */
3088 /* Pass the socket to a new Exim process. Before doing so, we must shut
3089 down TLS. Not all MTAs allow for the continuation of the SMTP session
3090 when TLS is shut down. We test for this by sending a new EHLO. If we
3091 don't get a good response, we don't attempt to pass the socket on. */
3094 if (tls_out.active >= 0)
3096 tls_close(FALSE, TRUE);
3097 smtp_peer_options = smtp_peer_options_wrap;
3101 lflags.ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3102 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3103 ob->command_timeout);
3107 /* If the socket is successfully passed, we musn't send QUIT (or
3108 indeed anything!) from here. */
3110 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3111 propagate it from the initial
3113 if (lflags.ok && transport_pass_socket(tblock->name, host->name,
3114 host->address, new_message_id, inblock.sock))
3115 lflags.send_quit = FALSE;
3118 /* If RSET failed and there are addresses left, they get deferred. */
3120 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3121 #ifdef EXPERIMENTAL_DSN_INFO
3122 , smtp_greeting, helo_response
3128 /* End off tidily with QUIT unless the connection has died or the socket has
3129 been passed to another process. There has been discussion on the net about what
3130 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3131 to wait for a response, but on the other hand, there isn't anything one can do
3132 with an error response, other than log it. Exim used to do that. However,
3133 further discussion suggested that it is positively advantageous not to wait for
3134 the response, but to close the session immediately. This is supposed to move
3135 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3136 load from the server. (Hosts that are both servers and clients may not see much
3137 difference, of course.) Further discussion indicated that this was safe to do
3138 on Unix systems which have decent implementations of TCP/IP that leave the
3139 connection around for a while (TIME_WAIT) after the application has gone away.
3140 This enables the response sent by the server to be properly ACKed rather than
3141 timed out, as can happen on broken TCP/IP implementations on other OS.
3143 This change is being made on 31-Jul-98. After over a year of trouble-free
3144 operation, the old commented-out code was removed on 17-Sep-99. */
3147 if (lflags.send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3152 tls_close(FALSE, TRUE);
3155 /* Close the socket, and return the appropriate value, first setting
3156 works because the NULL setting is passed back to the calling process, and
3157 remote_max_parallel is forced to 1 when delivering over an existing connection,
3159 If all went well and continue_more is set, we shouldn't actually get here if
3160 there are further addresses, as the return above will be taken. However,
3161 writing RSET might have failed, or there may be other addresses whose hosts are
3162 specified in the transports, and therefore not visible at top level, in which
3163 case continue_more won't get set. */
3165 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3166 if (lflags.send_quit)
3168 shutdown(outblock.sock, SHUT_WR);
3169 for (rc = 16; read(inblock.sock, inbuffer, sizeof(inbuffer)) > 0 && rc > 0;)
3170 rc--; /* drain socket */
3172 (void)close(inblock.sock);
3174 #ifndef DISABLE_EVENT
3175 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3178 continue_transport = NULL;
3179 continue_hostname = NULL;
3186 /*************************************************
3187 * Closedown entry point *
3188 *************************************************/
3190 /* This function is called when exim is passed an open smtp channel
3191 from another incarnation, but the message which it has been asked
3192 to deliver no longer exists. The channel is on stdin.
3194 We might do fancy things like looking for another message to send down
3195 the channel, but if the one we sought has gone, it has probably been
3196 delivered by some other process that itself will seek further messages,
3197 so just close down our connection.
3199 Argument: pointer to the transport instance block
3204 smtp_transport_closedown(transport_instance *tblock)
3206 smtp_transport_options_block *ob =
3207 (smtp_transport_options_block *)(tblock->options_block);
3208 smtp_inblock inblock;
3209 smtp_outblock outblock;
3211 uschar inbuffer[4096];
3212 uschar outbuffer[16];
3214 inblock.sock = fileno(stdin);
3215 inblock.buffer = inbuffer;
3216 inblock.buffersize = sizeof(inbuffer);
3217 inblock.ptr = inbuffer;
3218 inblock.ptrend = inbuffer;
3220 outblock.sock = inblock.sock;
3221 outblock.buffersize = sizeof(outbuffer);
3222 outblock.buffer = outbuffer;
3223 outblock.ptr = outbuffer;
3224 outblock.cmd_count = 0;
3225 outblock.authenticating = FALSE;
3227 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3228 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3229 ob->command_timeout);
3230 (void)close(inblock.sock);
3235 /*************************************************
3236 * Prepare addresses for delivery *
3237 *************************************************/
3239 /* This function is called to flush out error settings from previous delivery
3240 attempts to other hosts. It also records whether we got here via an MX record
3241 or not in the more_errno field of the address. We are interested only in
3242 addresses that are still marked DEFER - others may have got delivered to a
3243 previously considered IP address. Set their status to PENDING_DEFER to indicate
3244 which ones are relevant this time.
3247 addrlist the list of addresses
3248 host the host we are delivering to
3250 Returns: the first address for this delivery
3253 static address_item *
3254 prepare_addresses(address_item *addrlist, host_item *host)
3256 address_item *first_addr = NULL;
3258 for (addr = addrlist; addr; addr = addr->next)
3259 if (addr->transport_return == DEFER)
3261 if (!first_addr) first_addr = addr;
3262 addr->transport_return = PENDING_DEFER;
3263 addr->basic_errno = 0;
3264 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3265 addr->message = NULL;
3267 addr->cipher = NULL;
3268 addr->ourcert = NULL;
3269 addr->peercert = NULL;
3270 addr->peerdn = NULL;
3271 addr->ocsp = OCSP_NOT_REQ;
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 addr->smtp_greeting = NULL;
3275 addr->helo_response = NULL;
3283 /*************************************************
3284 * Main entry point *
3285 *************************************************/
3287 /* See local README for interface details. As this is a remote transport, it is
3288 given a chain of addresses to be delivered in one connection, if possible. It
3289 always returns TRUE, indicating that each address has its own independent
3290 status set, except if there is a setting up problem, in which case it returns
3294 smtp_transport_entry(
3295 transport_instance *tblock, /* data for this instantiation */
3296 address_item *addrlist) /* addresses we are working on */
3300 int hosts_defer = 0;
3302 int hosts_looked_up = 0;
3303 int hosts_retry = 0;
3304 int hosts_serial = 0;
3305 int hosts_total = 0;
3306 int total_hosts_tried = 0;
3308 BOOL expired = TRUE;
3309 uschar *expanded_hosts = NULL;
3311 uschar *tid = string_sprintf("%s transport", tblock->name);
3312 smtp_transport_options_block *ob =
3313 (smtp_transport_options_block *)(tblock->options_block);
3314 host_item *hostlist = addrlist->host_list;
3315 host_item *host = NULL;
3319 debug_printf("%s transport entered\n", tblock->name);
3320 for (addr = addrlist; addr; addr = addr->next)
3321 debug_printf(" %s\n", addr->address);
3324 debug_printf("hostlist:\n");
3325 for (host = hostlist; host; host = host->next)
3326 debug_printf(" %s:%d\n", host->name, host->port);
3328 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3329 continue_hostname, continue_host_address);
3332 /* Set the flag requesting that these hosts be added to the waiting
3333 database if the delivery fails temporarily or if we are running with
3334 queue_smtp or a 2-stage queue run. This gets unset for certain
3335 kinds of error, typically those that are specific to the message. */
3337 update_waiting = TRUE;
3339 /* If a host list is not defined for the addresses - they must all have the
3340 same one in order to be passed to a single transport - or if the transport has
3341 a host list with hosts_override set, use the host list supplied with the
3342 transport. It is an error for this not to exist. */
3344 if (!hostlist || (ob->hosts_override && ob->hosts))
3348 addrlist->message = string_sprintf("%s transport called with no hosts set",
3350 addrlist->transport_return = PANIC;
3351 return FALSE; /* Only top address has status */
3354 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3357 /* If the transport's host list contains no '$' characters, and we are not
3358 randomizing, it is fixed and therefore a chain of hosts can be built once
3359 and for all, and remembered for subsequent use by other calls to this
3360 transport. If, on the other hand, the host list does contain '$', or we are
3361 randomizing its order, we have to rebuild it each time. In the fixed case,
3362 as the hosts string will never be used again, it doesn't matter that we
3363 replace all the : characters with zeros. */
3367 uschar *s = ob->hosts;
3369 if (Ustrchr(s, '$') != NULL)
3371 if (!(expanded_hosts = expand_string(s)))
3373 addrlist->message = string_sprintf("failed to expand list of hosts "
3374 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3375 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3376 return FALSE; /* Only top address has status */
3378 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3379 "\"%s\"\n", s, expanded_hosts);
3383 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3385 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3387 /* Check that the expansion yielded something useful. */
3391 string_sprintf("%s transport has empty hosts setting", tblock->name);
3392 addrlist->transport_return = PANIC;
3393 return FALSE; /* Only top address has status */
3396 /* If there was no expansion of hosts, save the host list for
3399 if (!expanded_hosts) ob->hostlist = hostlist;
3402 /* This is not the first time this transport has been run in this delivery;
3403 the host list was built previously. */
3406 hostlist = ob->hostlist;
3409 /* The host list was supplied with the address. If hosts_randomize is set, we
3410 must sort it into a random order if it did not come from MX records and has not
3411 already been randomized (but don't bother if continuing down an existing
3414 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3416 host_item *newlist = NULL;
3419 host_item *h = hostlist;
3420 hostlist = hostlist->next;
3422 h->sort_key = random_number(100);
3429 else if (h->sort_key < newlist->sort_key)
3436 host_item *hh = newlist;
3439 if (h->sort_key < hh->next->sort_key) break;
3447 hostlist = addrlist->host_list = newlist;
3450 /* Sort out the default port. */
3452 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3454 /* For each host-plus-IP-address on the list:
3456 . If this is a continued delivery and the host isn't the one with the
3457 current connection, skip.
3459 . If the status is unusable (i.e. previously failed or retry checked), skip.
3461 . If no IP address set, get the address, either by turning the name into
3462 an address, calling gethostbyname if gethostbyname is on, or by calling
3463 the DNS. The DNS may yield multiple addresses, in which case insert the
3464 extra ones into the list.
3466 . Get the retry data if not previously obtained for this address and set the
3467 field which remembers the state of this address. Skip if the retry time is
3468 not reached. If not, remember whether retry data was found. The retry string
3469 contains both the name and the IP address.
3471 . Scan the list of addresses and mark those whose status is DEFER as
3472 PENDING_DEFER. These are the only ones that will be processed in this cycle
3475 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3476 Some addresses may be successfully delivered, others may fail, and yet
3477 others may get temporary errors and so get marked DEFER.
3479 . The return from the delivery attempt is OK if a connection was made and a
3480 valid SMTP dialogue was completed. Otherwise it is DEFER.
3482 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3484 . If fail to connect, or other defer state, add a retry item.
3486 . If there are any addresses whose status is still DEFER, carry on to the
3487 next host/IPaddress, unless we have tried the number of hosts given
3488 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3489 there is some fancy logic for hosts_max_try that means its limit can be
3490 overstepped in some circumstances.
3492 If we get to the end of the list, all hosts have deferred at least one address,
3493 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3494 delivery attempt to those hosts whose last try was before the arrival time of
3495 the current message. To cope with this, we have to go round the loop a second
3496 time. After that, set the status and error data for any addresses that haven't
3497 had it set already. */
3499 for (cutoff_retry = 0;
3500 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3503 host_item *nexthost = NULL;
3504 int unexpired_hosts_tried = 0;
3506 for (host = hostlist;
3508 && unexpired_hosts_tried < ob->hosts_max_try
3509 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3515 BOOL host_is_expired = FALSE;
3516 BOOL message_defer = FALSE;
3517 BOOL some_deferred = FALSE;
3518 address_item *first_addr = NULL;
3519 uschar *interface = NULL;
3520 uschar *retry_host_key = NULL;
3521 uschar *retry_message_key = NULL;
3522 uschar *serialize_key = NULL;
3524 /* Default next host is next host. :-) But this can vary if the
3525 hosts_max_try limit is hit (see below). It may also be reset if a host
3526 address is looked up here (in case the host was multihomed). */
3528 nexthost = host->next;
3530 /* If the address hasn't yet been obtained from the host name, look it up
3531 now, unless the host is already marked as unusable. If it is marked as
3532 unusable, it means that the router was unable to find its IP address (in
3533 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3534 the lookup failed last time. We don't get this far if *all* MX records
3535 point to non-existent hosts; that is treated as a hard error.
3537 We can just skip this host entirely. When the hosts came from the router,
3538 the address will timeout based on the other host(s); when the address is
3539 looked up below, there is an explicit retry record added.
3541 Note that we mustn't skip unusable hosts if the address is not unset; they
3542 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3546 int new_port, flags;
3549 if (host->status >= hstatus_unusable)
3551 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3556 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3558 /* The host name is permitted to have an attached port. Find it, and
3559 strip it from the name. Just remember it for now. */
3561 new_port = host_item_get_port(host);
3563 /* Count hosts looked up */
3567 /* Find by name if so configured, or if it's an IP address. We don't
3568 just copy the IP address, because we need the test-for-local to happen. */
3570 flags = HOST_FIND_BY_A;
3571 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3572 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3574 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3575 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3577 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3578 &ob->dnssec, /* domains for request/require */
3581 /* Update the host (and any additional blocks, resulting from
3582 multihoming) with a host-specific port, if any. */
3584 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3586 /* Failure to find the host at this time (usually DNS temporary failure)
3587 is really a kind of routing failure rather than a transport failure.
3588 Therefore we add a retry item of the routing kind, not to stop us trying
3589 to look this name up here again, but to ensure the address gets timed
3590 out if the failures go on long enough. A complete failure at this point
3591 commonly points to a configuration error, but the best action is still
3592 to carry on for the next host. */
3594 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3596 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3598 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3599 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3600 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3601 host->status = hstatus_unusable;
3603 for (addr = addrlist; addr; addr = addr->next)
3605 if (addr->transport_return != DEFER) continue;
3606 addr->basic_errno = ERRNO_UNKNOWNHOST;
3608 string_sprintf("failed to lookup IP address for %s", host->name);
3613 /* If the host is actually the local host, we may have a problem, or
3614 there may be some cunning configuration going on. In the problem case,
3615 log things and give up. The default transport status is already DEFER. */
3617 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3619 for (addr = addrlist; addr; addr = addr->next)
3621 addr->basic_errno = 0;
3622 addr->message = string_sprintf("%s transport found host %s to be "
3623 "local", tblock->name, host->name);
3627 } /* End of block for IP address lookup */
3629 /* If this is a continued delivery, we are interested only in the host
3630 which matches the name of the existing open channel. The check is put
3631 here after the local host lookup, in case the name gets expanded as a
3632 result of the lookup. Set expired FALSE, to save the outer loop executing
3635 if ( continue_hostname
3636 && ( Ustrcmp(continue_hostname, host->name) != 0
3637 || Ustrcmp(continue_host_address, host->address) != 0
3641 continue; /* With next host */
3644 /* Reset the default next host in case a multihomed host whose addresses
3645 are not looked up till just above added to the host list. */
3647 nexthost = host->next;
3649 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3650 domain is in queue_smtp_domains, we don't actually want to attempt any
3651 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3652 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3653 were not in it. We don't want to hold up all SMTP deliveries! Except when
3654 doing a two-stage queue run, don't do this if forcing. */
3656 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3657 match_isinlist(addrlist->domain,
3658 (const uschar **)&queue_smtp_domains, 0,
3659 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3662 for (addr = addrlist; addr; addr = addr->next)
3663 if (addr->transport_return == DEFER)
3664 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3665 continue; /* With next host */
3668 /* Count hosts being considered - purely for an intelligent comment
3669 if none are usable. */
3673 /* Set $host and $host address now in case they are needed for the
3674 interface expansion or the serialize_hosts check; they remain set if an
3675 actual delivery happens. */
3677 deliver_host = host->name;
3678 deliver_host_address = host->address;
3679 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3680 : host->dnssec == DS_NO ? US"no"
3683 /* Set up a string for adding to the retry key if the port number is not
3684 the standard SMTP port. A host may have its own port setting that overrides
3687 pistring = string_sprintf(":%d", host->port == PORT_NONE
3688 ? port : host->port);
3689 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3691 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3692 string is set, even if constant (as different transports can have different
3693 constant settings), we must add it to the key that is used for retries,
3694 because connections to the same host from a different interface should be
3695 treated separately. */
3697 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3698 if ((rs = ob->interface) && *rs)
3700 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3702 pistring = string_sprintf("%s/%s", pistring, interface);
3705 /* The first time round the outer loop, check the status of the host by
3706 inspecting the retry data. The second time round, we are interested only
3707 in expired hosts that haven't been tried since this message arrived. */
3709 if (cutoff_retry == 0)
3712 /* Ensure the status of the address is set by checking retry data if
3713 necessary. There may be host-specific retry data (applicable to all
3714 messages) and also data for retries of a specific message at this host.
3715 If either of these retry records are actually read, the keys used are
3716 returned to save recomputing them later. */
3718 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3719 US"retry_include_ip_address", ob->retry_include_ip_address,
3720 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3721 continue; /* with next host */
3723 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3724 incl_ip, &retry_host_key, &retry_message_key);
3726 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3727 (host->address == NULL)? US"" : host->address, pistring,
3728 (host->status == hstatus_usable)? "usable" :
3729 (host->status == hstatus_unusable)? "unusable" :
3730 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3732 /* Skip this address if not usable at this time, noting if it wasn't
3733 actually expired, both locally and in the address. */
3735 switch (host->status)
3737 case hstatus_unusable:
3739 setflag(addrlist, af_retry_skipped);
3742 case hstatus_unusable_expired:
3745 case hwhy_retry: hosts_retry++; break;
3746 case hwhy_failed: hosts_fail++; break;
3747 case hwhy_deferred: hosts_defer++; break;
3750 /* If there was a retry message key, implying that previously there
3751 was a message-specific defer, we don't want to update the list of
3752 messages waiting for these hosts. */
3754 if (retry_message_key) update_waiting = FALSE;
3755 continue; /* With the next host or IP address */
3759 /* Second time round the loop: if the address is set but expired, and
3760 the message is newer than the last try, let it through. */
3765 || host->status != hstatus_unusable_expired
3766 || host->last_try > received_time)
3768 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3769 host->name, host->address, pistring);
3770 host_is_expired = TRUE;
3773 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3774 it remains TRUE only if all hosts are expired and none are actually tried.
3779 /* If this host is listed as one to which access must be serialized,
3780 see if another Exim process has a connection to it, and if so, skip
3781 this host. If not, update the database to record our connection to it
3782 and remember this for later deletion. Do not do any of this if we are
3783 sending the message down a pre-existing connection. */
3785 if ( !continue_hostname
3786 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3788 serialize_key = string_sprintf("host-serialize-%s", host->name);
3789 if (!enq_start(serialize_key, 1))
3792 debug_printf("skipping host %s because another Exim process "
3793 "is connected to it\n", host->name);
3799 /* OK, we have an IP address that is not waiting for its retry time to
3800 arrive (it might be expired) OR (second time round the loop) we have an
3801 expired host that hasn't been tried since the message arrived. Have a go
3802 at delivering the message to it. First prepare the addresses by flushing
3803 out the result of previous attempts, and finding the first address that
3804 is still to be delivered. */
3806 first_addr = prepare_addresses(addrlist, host);
3808 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3809 message_id, host->name, host->address, addrlist->address,
3810 addrlist->next ? ", ..." : "");
3812 set_process_info("delivering %s to %s [%s] (%s%s)",
3813 message_id, host->name, host->address, addrlist->address,
3814 addrlist->next ? ", ..." : "");
3816 /* This is not for real; don't do the delivery. If there are
3817 any remaining hosts, list them. */
3822 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3823 for (addr = addrlist; addr; addr = addr->next)
3825 addr->host_used = host;
3826 addr->special_action = '*';
3827 addr->message = US"delivery bypassed by -N option";
3831 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3832 "*** host and remaining hosts:\n", tblock->name);
3833 for (host2 = host; host2; host2 = host2->next)
3834 debug_printf(" %s [%s]\n", host2->name,
3835 host2->address ? host2->address : US"unset");
3840 /* This is for real. If the host is expired, we don't count it for
3841 hosts_max_retry. This ensures that all hosts must expire before an address
3842 is timed out, unless hosts_max_try_hardlimit (which protects against
3843 lunatic DNS configurations) is reached.
3845 If the host is not expired and we are about to hit the hosts_max_retry
3846 limit, check to see if there is a subsequent hosts with a different MX
3847 value. If so, make that the next host, and don't count this one. This is a
3848 heuristic to make sure that different MXs do get tried. With a normal kind
3849 of retry rule, they would get tried anyway when the earlier hosts were
3850 delayed, but if the domain has a "retry every time" type of rule - as is
3851 often used for the the very large ISPs, that won't happen. */
3856 /* Make a copy of the host if it is local to this invocation
3857 of the transport. */
3861 thost = store_get(sizeof(host_item));
3863 thost->name = string_copy(host->name);
3864 thost->address = string_copy(host->address);
3869 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3873 debug_printf("hosts_max_try limit reached with this host\n");
3874 for (h = host; h; h = h->next) if (h->mx != host->mx)
3877 unexpired_hosts_tried--;
3878 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3879 "and will be tried\n");
3884 /* Attempt the delivery. */
3886 total_hosts_tried++;
3887 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3888 &message_defer, FALSE);
3891 OK => connection made, each address contains its result;
3892 message_defer is set for message-specific defers (when all
3893 recipients are marked defer)
3894 DEFER => there was a non-message-specific delivery problem;
3895 ERROR => there was a problem setting up the arguments for a filter,
3896 or there was a problem with expanding added headers
3899 /* If the result is not OK, there was a non-message-specific problem.
3900 If the result is DEFER, we need to write to the logs saying what happened
3901 for this particular host, except in the case of authentication and TLS
3902 failures, where the log has already been written. If all hosts defer a
3903 general message is written at the end. */
3905 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3906 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3907 write_logs(first_addr, host);
3909 #ifndef DISABLE_EVENT
3911 deferred_event_raise(first_addr, host);
3914 /* If STARTTLS was accepted, but there was a failure in setting up the
3915 TLS session (usually a certificate screwup), and the host is not in
3916 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3917 TLS forcibly turned off. We have to start from scratch with a new SMTP
3918 connection. That's why the retry is done from here, not from within
3919 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3920 session, so the in-clear transmission after those errors, if permitted,
3921 happens inside smtp_deliver().] */
3925 && first_addr->basic_errno == ERRNO_TLSFAILURE
3926 && ob->tls_tempfail_tryclear
3927 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3930 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3931 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3932 first_addr = prepare_addresses(addrlist, host);
3933 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3934 &message_defer, TRUE);
3935 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3936 write_logs(first_addr, host);
3937 # ifndef DISABLE_EVENT
3939 deferred_event_raise(first_addr, host);
3942 #endif /*SUPPORT_TLS*/
3945 /* Delivery attempt finished */
3947 rs = rc == OK ? US"OK"
3948 : rc == DEFER ? US"DEFER"
3949 : rc == ERROR ? US"ERROR"
3952 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3953 message_id, host->name, host->address, addrlist->address,
3954 addrlist->next ? " (& others)" : "", rs);
3956 /* Release serialization if set up */
3958 if (serialize_key) enq_end(serialize_key);
3960 /* If the result is DEFER, or if a host retry record is known to exist, we
3961 need to add an item to the retry chain for updating the retry database
3962 at the end of delivery. We only need to add the item to the top address,
3963 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3964 for any other delivery attempts using the same address. (It is copied into
3965 the unusable tree at the outer level, so even if different address blocks
3966 contain the same address, it still won't get tried again.) */
3968 if (rc == DEFER || retry_host_key)
3970 int delete_flag = rc != DEFER ? rf_delete : 0;
3971 if (!retry_host_key)
3974 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3975 US"retry_include_ip_address", ob->retry_include_ip_address,
3976 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3977 incl_ip = TRUE; /* error; use most-specific retry record */
3979 retry_host_key = incl_ip
3980 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3981 : string_sprintf("T:%S%s", host->name, pistring);
3984 /* If a delivery of another message over an existing SMTP connection
3985 yields DEFER, we do NOT set up retry data for the host. This covers the
3986 case when there are delays in routing the addresses in the second message
3987 that are so long that the server times out. This is alleviated by not
3988 routing addresses that previously had routing defers when handling an
3989 existing connection, but even so, this case may occur (e.g. if a
3990 previously happily routed address starts giving routing defers). If the
3991 host is genuinely down, another non-continued message delivery will
3992 notice it soon enough. */
3994 if (delete_flag != 0 || !continue_hostname)
3995 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3997 /* We may have tried an expired host, if its retry time has come; ensure
3998 the status reflects the expiry for the benefit of any other addresses. */
4002 host->status = host_is_expired
4003 ? hstatus_unusable_expired : hstatus_unusable;
4004 host->why = hwhy_deferred;
4008 /* If message_defer is set (host was OK, but every recipient got deferred
4009 because of some message-specific problem), or if that had happened
4010 previously so that a message retry key exists, add an appropriate item
4011 to the retry chain. Note that if there was a message defer but now there is
4012 a host defer, the message defer record gets deleted. That seems perfectly
4013 reasonable. Also, stop the message from being remembered as waiting
4014 for specific hosts. */
4016 if (message_defer || retry_message_key)
4018 int delete_flag = message_defer ? 0 : rf_delete;
4019 if (!retry_message_key)
4022 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4023 US"retry_include_ip_address", ob->retry_include_ip_address,
4024 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4025 incl_ip = TRUE; /* error; use most-specific retry record */
4027 retry_message_key = incl_ip
4028 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4030 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4032 retry_add_item(addrlist, retry_message_key,
4033 rf_message | rf_host | delete_flag);
4034 update_waiting = FALSE;
4037 /* Any return other than DEFER (that is, OK or ERROR) means that the
4038 addresses have got their final statuses filled in for this host. In the OK
4039 case, see if any of them are deferred. */
4042 for (addr = addrlist; addr; addr = addr->next)
4043 if (addr->transport_return == DEFER)
4045 some_deferred = TRUE;
4049 /* If no addresses deferred or the result was ERROR, return. We do this for
4050 ERROR because a failing filter set-up or add_headers expansion is likely to
4051 fail for any host we try. */
4053 if (rc == ERROR || (rc == OK && !some_deferred))
4055 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4056 return TRUE; /* Each address has its status */
4059 /* If the result was DEFER or some individual addresses deferred, let
4060 the loop run to try other hosts with the deferred addresses, except for the
4061 case when we were trying to deliver down an existing channel and failed.
4062 Don't try any other hosts in this case. */
4064 if (continue_hostname) break;
4066 /* If the whole delivery, or some individual addresses, were deferred and
4067 there are more hosts that could be tried, do not count this host towards
4068 the hosts_max_try limit if the age of the message is greater than the
4069 maximum retry time for this host. This means we may try try all hosts,
4070 ignoring the limit, when messages have been around for some time. This is
4071 important because if we don't try all hosts, the address will never time
4072 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4074 if ((rc == DEFER || some_deferred) && nexthost)
4077 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4079 if (retry && retry->rules)
4081 retry_rule *last_rule;
4082 for (last_rule = retry->rules;
4084 last_rule = last_rule->next);
4085 timedout = time(NULL) - received_time > last_rule->timeout;
4087 else timedout = TRUE; /* No rule => timed out */
4091 unexpired_hosts_tried--;
4092 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4093 "hosts_max_try (message older than host's retry time)\n");
4096 } /* End of loop for trying multiple hosts. */
4098 /* This is the end of the loop that repeats iff expired is TRUE and
4099 ob->delay_after_cutoff is FALSE. The second time round we will
4100 try those hosts that haven't been tried since the message arrived. */
4104 debug_printf("all IP addresses skipped or deferred at least one address\n");
4105 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4106 debug_printf("retrying IP addresses not tried since message arrived\n");
4111 /* Get here if all IP addresses are skipped or defer at least one address. In
4112 MUA wrapper mode, this will happen only for connection or other non-message-
4113 specific failures. Force the delivery status for all addresses to FAIL. */
4117 for (addr = addrlist; addr; addr = addr->next)
4118 addr->transport_return = FAIL;
4122 /* In the normal, non-wrapper case, add a standard message to each deferred
4123 address if there hasn't been an error, that is, if it hasn't actually been
4124 tried this time. The variable "expired" will be FALSE if any deliveries were
4125 actually tried, or if there was at least one host that was not expired. That
4126 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4127 a delivery has been tried, an error code will be set, and the failing of the
4128 message is handled by the retry code later.
4130 If queue_smtp is set, or this transport was called to send a subsequent message
4131 down an existing TCP/IP connection, and something caused the host not to be
4132 found, we end up here, but can detect these cases and handle them specially. */
4134 for (addr = addrlist; addr; addr = addr->next)
4136 /* If host is not NULL, it means that we stopped processing the host list
4137 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4138 means we need to behave as if some hosts were skipped because their retry
4139 time had not come. Specifically, this prevents the address from timing out.
4140 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4141 hosts were tried. */
4144 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4147 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4148 "hosts were tried\n");
4153 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4154 setflag(addr, af_retry_skipped);
4157 if (queue_smtp) /* no deliveries attempted */
4159 addr->transport_return = DEFER;
4160 addr->basic_errno = 0;
4161 addr->message = US"SMTP delivery explicitly queued";
4164 else if ( addr->transport_return == DEFER
4165 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4169 addr->basic_errno = ERRNO_HRETRY;
4170 if (continue_hostname)
4171 addr->message = US"no host found for existing SMTP connection";
4174 setflag(addr, af_pass_message); /* This is not a security risk */
4175 addr->message = string_sprintf(
4176 "all hosts%s have been failing for a long time %s",
4177 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4178 ob->delay_after_cutoff
4179 ? US"(and retry time not reached)"
4180 : US"and were last tried after this message arrived");
4182 /* If we are already using fallback hosts, or there are no fallback hosts
4183 defined, convert the result to FAIL to cause a bounce. */
4185 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4186 addr->transport_return = FAIL;
4191 if (hosts_retry == hosts_total)
4192 s = "retry time not reached for any host%s";
4193 else if (hosts_fail == hosts_total)
4194 s = "all host address lookups%s failed permanently";
4195 else if (hosts_defer == hosts_total)
4196 s = "all host address lookups%s failed temporarily";
4197 else if (hosts_serial == hosts_total)
4198 s = "connection limit reached for all hosts%s";
4199 else if (hosts_fail+hosts_defer == hosts_total)
4200 s = "all host address lookups%s failed";
4202 s = "some host address lookups failed and retry time "
4203 "not reached for other hosts or connection limit reached%s";
4205 addr->message = string_sprintf(s,
4206 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4211 /* Update the database which keeps information about which messages are waiting
4212 for which hosts to become available. For some message-specific errors, the
4213 update_waiting flag is turned off because we don't want follow-on deliveries in
4214 those cases. If this transport instance is explicitly limited to one message
4215 per connection then follow-on deliveries are not possible and there's no need
4216 to create/update the per-transport wait-<transport_name> database. */
4218 if (update_waiting && tblock->connection_max_messages != 1)
4219 transport_update_waiting(hostlist, tblock->name);
4223 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4225 return TRUE; /* Each address has its status */
4230 /* End of transport/smtp.c */