1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
193 smtp_transport_options_block smtp_transport_option_defaults = {0};
194 void smtp_transport_init(transport_instance *tblock) {}
195 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
196 void smtp_transport_closedown(transport_instance *tblock) {}
198 #else /*!MACRO_PREDEF*/
201 /* Default private options block for the smtp transport. */
203 smtp_transport_options_block smtp_transport_option_defaults = {
207 .fallback_hostlist = NULL,
208 .authenticated_sender = NULL,
209 .helo_data = US"$primary_hostname",
212 .protocol = US"smtp",
214 .serialize_hosts = NULL,
215 .hosts_try_auth = NULL,
216 .hosts_require_auth = NULL,
217 .hosts_try_chunking = US"*",
218 #ifdef EXPERIMENTAL_DANE
219 .hosts_try_dane = NULL,
220 .hosts_require_dane = NULL,
222 .hosts_try_fastopen = NULL,
224 .hosts_try_prdr = US"*",
227 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
228 .hosts_require_ocsp = NULL,
230 .hosts_require_tls = NULL,
231 .hosts_avoid_tls = NULL,
232 .hosts_verify_avoid_tls = NULL,
233 .hosts_avoid_pipelining = NULL,
234 .hosts_avoid_esmtp = NULL,
236 .hosts_nopass_tls = NULL,
237 .hosts_noproxy_tls = US"*",
239 .command_timeout = 5*60,
240 .connect_timeout = 5*60,
241 .data_timeout = 5*60,
242 .final_timeout = 10*60,
243 .size_addition = 1024,
245 .hosts_max_try_hardlimit = 50,
246 .address_retry_include_sender = TRUE,
247 .allow_localhost = FALSE,
248 .authenticated_sender_force = FALSE,
249 .gethostbyname = FALSE,
250 .dns_qualify_single = TRUE,
251 .dns_search_parents = FALSE,
252 .dnssec = { .request=NULL, .require=NULL },
253 .delay_after_cutoff = TRUE,
254 .hosts_override = FALSE,
255 .hosts_randomize = FALSE,
257 .lmtp_ignore_quota = FALSE,
258 .expand_retry_include_ip_address = NULL,
259 .retry_include_ip_address = TRUE,
264 .tls_certificate = NULL,
266 .tls_privatekey = NULL,
267 .tls_require_ciphers = NULL,
269 .tls_verify_certificates = US"system",
270 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
271 .tls_tempfail_tryclear = TRUE,
272 .tls_verify_hosts = NULL,
273 .tls_try_verify_hosts = US"*",
274 .tls_verify_cert_hostnames = US"*",
278 {.dkim_domain = NULL,
279 .dkim_private_key = NULL,
280 .dkim_selector = NULL,
282 .dkim_sign_headers = NULL,
284 .dot_stuffed = FALSE},
288 /* some DSN flags for use later */
290 static int rf_list[] = {rf_notify_never, rf_notify_success,
291 rf_notify_failure, rf_notify_delay };
293 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
299 static uschar *smtp_command; /* Points to last cmd for error messages */
300 static uschar *mail_command; /* Points to MAIL cmd for error messages */
301 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
302 static BOOL update_waiting; /* TRUE to update the "wait" database */
304 /*XXX move to smtp_context */
305 static BOOL pipelining_active; /* current transaction is in pipe mode */
308 /*************************************************
309 * Setup entry point *
310 *************************************************/
312 /* This function is called when the transport is about to be used,
313 but before running it in a sub-process. It is used for two things:
315 (1) To set the fallback host list in addresses, when delivering.
316 (2) To pass back the interface, port, protocol, and other options, for use
317 during callout verification.
320 tblock pointer to the transport instance block
321 addrlist list of addresses about to be transported
322 tf if not NULL, pointer to block in which to return options
323 uid the uid that will be set (not used)
324 gid the gid that will be set (not used)
325 errmsg place for error message (not used)
327 Returns: OK always (FAIL, DEFER not used)
331 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
332 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
334 smtp_transport_options_block *ob =
335 (smtp_transport_options_block *)(tblock->options_block);
337 errmsg = errmsg; /* Keep picky compilers happy */
341 /* Pass back options if required. This interface is getting very messy. */
345 tf->interface = ob->interface;
347 tf->protocol = ob->protocol;
348 tf->hosts = ob->hosts;
349 tf->hosts_override = ob->hosts_override;
350 tf->hosts_randomize = ob->hosts_randomize;
351 tf->gethostbyname = ob->gethostbyname;
352 tf->qualify_single = ob->dns_qualify_single;
353 tf->search_parents = ob->dns_search_parents;
354 tf->helo_data = ob->helo_data;
357 /* Set the fallback host list for all the addresses that don't have fallback
358 host lists, provided that the local host wasn't present in the original host
361 if (!testflag(addrlist, af_local_host_removed))
362 for (; addrlist; addrlist = addrlist->next)
363 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
370 /*************************************************
371 * Initialization entry point *
372 *************************************************/
374 /* Called for each instance, after its options have been read, to
375 enable consistency checks to be done, or anything else that needs
378 Argument: pointer to the transport instance block
383 smtp_transport_init(transport_instance *tblock)
385 smtp_transport_options_block *ob =
386 (smtp_transport_options_block *)(tblock->options_block);
388 /* Retry_use_local_part defaults FALSE if unset */
390 if (tblock->retry_use_local_part == TRUE_UNSET)
391 tblock->retry_use_local_part = FALSE;
393 /* Set the default port according to the protocol */
395 if (ob->port == NULL)
396 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
397 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
399 /* Set up the setup entry point, to be called before subprocesses for this
402 tblock->setup = smtp_transport_setup;
404 /* Complain if any of the timeouts are zero. */
406 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
407 ob->final_timeout <= 0)
408 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
409 "command, data, or final timeout value is zero for %s transport",
412 /* If hosts_override is set and there are local hosts, set the global
413 flag that stops verify from showing router hosts. */
415 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
417 /* If there are any fallback hosts listed, build a chain of host items
418 for them, but do not do any lookups at this time. */
420 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
427 /*************************************************
428 * Set delivery info into all active addresses *
429 *************************************************/
431 /* Only addresses whose status is >= PENDING are relevant. A lesser
432 status means that an address is not currently being processed.
435 addrlist points to a chain of addresses
436 errno_value to put in each address's errno field
437 msg to put in each address's message field
438 rc to put in each address's transport_return field
439 pass_message if TRUE, set the "pass message" flag in the address
440 host if set, mark addrs as having used this host
441 smtp_greeting from peer
442 helo_response from peer
444 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446 this particular type of timeout.
452 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
453 BOOL pass_message, host_item * host
454 #ifdef EXPERIMENTAL_DSN_INFO
455 , const uschar * smtp_greeting, const uschar * helo_response
461 if (errno_value == ERRNO_CONNECTTIMEOUT)
463 errno_value = ETIMEDOUT;
464 orvalue = RTEF_CTOUT;
466 for (addr = addrlist; addr; addr = addr->next)
467 if (addr->transport_return >= PENDING)
469 addr->basic_errno = errno_value;
470 addr->more_errno |= orvalue;
474 if (pass_message) setflag(addr, af_pass_message);
476 addr->transport_return = rc;
479 addr->host_used = host;
480 #ifdef EXPERIMENTAL_DSN_INFO
482 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
483 addr->smtp_greeting = smtp_greeting;
486 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
487 addr->helo_response = helo_response;
494 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
498 #ifdef EXPERIMENTAL_DSN_INFO
505 /*************************************************
506 * Check an SMTP response *
507 *************************************************/
509 /* This function is given an errno code and the SMTP response buffer
510 to analyse, together with the host identification for generating messages. It
511 sets an appropriate message and puts the first digit of the response code into
512 the yield variable. If no response was actually read, a suitable digit is
516 host the current host, to get its name for messages
517 errno_value pointer to the errno value
518 more_errno from the top address for use with ERRNO_FILTER_FAIL
519 buffer the SMTP response buffer
520 yield where to put a one-digit SMTP response code
521 message where to put an error message
522 pass_message set TRUE if message is an SMTP response
524 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
528 check_response(host_item *host, int *errno_value, int more_errno,
529 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
531 uschar * pl = pipelining_active ? US"pipelined " : US"";
534 *yield = '4'; /* Default setting is to give a temporary error */
538 case ETIMEDOUT: /* Handle response timeout */
539 *message = US string_sprintf("SMTP timeout after %s%s",
541 if (transport_count > 0)
542 *message = US string_sprintf("%s (%d bytes written)", *message,
546 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
547 s = string_printing(buffer);
548 while (isspace(*s)) s++;
550 ? string_sprintf("Malformed SMTP reply (an empty line) "
551 "in response to %s%s", pl, smtp_command)
552 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
553 pl, smtp_command, s);
556 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
557 can't send QUIT as we mustn't end the DATA. */
558 *message = string_sprintf("transport filter process failed (%d)%s",
560 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
563 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
564 can't send QUIT as we mustn't end the DATA. */
566 string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
570 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
571 *message = string_sprintf("failed to write a data block");
575 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 /* Handle error responses from the remote mailer. */
586 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
587 "%s", pl, smtp_command, s = string_printing(buffer));
588 *pass_message = TRUE;
593 /* No data was read. If there is no errno, this must be the EOF (i.e.
594 connection closed) case, which causes deferral. An explicit connection reset
595 error has the same effect. Otherwise, put the host's identity in the message,
596 leaving the errno value to be interpreted as well. In all cases, we have to
597 assume the connection is now dead. */
599 if (*errno_value == 0 || *errno_value == ECONNRESET)
601 *errno_value = ERRNO_SMTPCLOSED;
602 *message = US string_sprintf("Remote host closed connection "
603 "in response to %s%s", pl, smtp_command);
606 *message = US string_sprintf("%s [%s]", host->name, host->address);
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
617 /* This writes to the main log and to the message log.
620 addr the address item containing error information
621 host the current host
627 write_logs(address_item *addr, host_item *host)
629 uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
636 message = string_sprintf("%s: %s", message, addr->message);
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
651 msglog_line(host_item * host, uschar * message)
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
659 #ifndef DISABLE_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
668 addr the address item containing error information
669 host the current host
675 deferred_event_raise(address_item *addr, host_item *host)
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
697 (void) event_raise(action, US"msg:host:defer",
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
738 sx smtp connection context
739 count the number of responses to read
740 pending_DATA 0 if last command sent was not DATA
741 +1 if previously had a good recipient
742 -1 if not previously had a good recipient
744 Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
754 sync_responses(smtp_context * sx, int count, int pending_DATA)
756 address_item *addr = sx->sync_addr;
757 smtp_transport_options_block *ob =
758 (smtp_transport_options_block *)sx->tblock->options_block;
761 /* Handle the response for a MAIL command. On error, reinstate the original
762 command in big_buffer for error message use, and flush any further pending
763 responses before returning, except after I/O errors and timeouts. */
765 if (sx->pending_MAIL)
768 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
769 '2', ob->command_timeout))
771 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
772 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
773 if (errno == 0 && sx->buffer[0] != 0)
775 uschar flushbuffer[4096];
777 if (sx->buffer[0] == '4')
779 save_errno = ERRNO_MAIL4XX;
780 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
784 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
785 '2', ob->command_timeout)
786 && (errno != 0 || flushbuffer[0] == 0))
792 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 while (count-- > 0) /* Mark any pending addrs with the host used */
795 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
796 addr->host_used = sx->host;
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
805 /* Read and handle the required number of RCPT responses, matching each one up
806 with an address by scanning for the next address whose status is PENDING_DEFER.
811 while (addr->transport_return != PENDING_DEFER)
812 if (!(addr = addr->next))
815 /* The address was accepted */
816 addr->host_used = sx->host;
818 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
819 '2', ob->command_timeout))
822 addr->transport_return = PENDING_OK;
824 /* If af_dr_retry_exists is set, there was a routing delay on this address;
825 ensure that any address-specific retry record is expunged. We do this both
826 for the basic key and for the version that also includes the sender. */
828 if (testflag(addr, af_dr_retry_exists))
830 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
832 retry_add_item(addr, altkey, rf_delete);
833 retry_add_item(addr, addr->address_retry_key, rf_delete);
837 /* Timeout while reading the response */
839 else if (errno == ETIMEDOUT)
841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
842 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
843 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
844 retry_add_item(addr, addr->address_retry_key, 0);
845 update_waiting = FALSE;
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
854 else if (errno != 0 || sx->buffer[0] == 0)
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
861 /* Handle SMTP permanent and temporary response codes. */
866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
867 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
868 string_printing(sx->buffer));
869 setflag(addr, af_pass_message);
871 msglog_line(sx->host, addr->message);
873 /* The response was 5xx */
875 if (sx->buffer[0] == '5')
877 addr->transport_return = FAIL;
881 /* The response was 4xx */
885 addr->transport_return = DEFER;
886 addr->basic_errno = ERRNO_RCPT4XX;
887 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
891 #ifndef DISABLE_EVENT
892 event_defer_errno = addr->more_errno;
893 msg_event_raise(US"msg:rcpt:host:defer", addr);
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
901 sx->host->name, sx->host->address, addr->message);
903 #ifndef DISABLE_EVENT
905 msg_event_raise(US"msg:rcpt:defer", addr);
908 /* Do not put this message on the list of those waiting for specific
909 hosts, as otherwise it is likely to be tried too often. */
911 update_waiting = FALSE;
913 /* Add a retry item for the address so that it doesn't get tried again
914 too soon. If address_retry_include_sender is true, add the sender address
918 ob->address_retry_include_sender
919 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
920 : addr->address_retry_key,
925 } /* Loop for next RCPT response */
927 /* Update where to start at for the next block of responses, unless we
928 have already handled all the addresses. */
930 if (addr) sx->sync_addr = addr->next;
932 /* Handle a response to DATA. If we have not had any good recipients, either
933 previously or in this block, the response is ignored. */
935 if (pending_DATA != 0 &&
936 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
937 '3', ob->command_timeout))
942 if (pending_DATA > 0 || (yield & 1) != 0)
944 if (errno == 0 && sx->buffer[0] == '4')
946 errno = ERRNO_DATA4XX;
947 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
951 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
952 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
953 "is in use and there were no good recipients\n", msg);
956 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
957 present) received 3xx. If any RCPTs were handled and yielded anything other
958 than 4xx, yield will be set non-zero. */
965 /* Do the client side of smtp-level authentication */
968 buffer EHLO response from server (gets overwritten)
969 addrlist chain of potential addresses to deliver
970 host host to deliver to
972 ibp, obp comms channel control blocks
975 OK Success, or failed (but not required): global "smtp_authenticated" set
976 DEFER Failed authentication (and was required)
977 ERROR Internal problem
979 FAIL_SEND Failed communications - transmit
984 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
985 smtp_transport_options_block *ob, BOOL is_esmtp,
986 smtp_inblock *ibp, smtp_outblock *obp)
989 uschar *fail_reason = US"server did not advertise AUTH support";
991 smtp_authenticated = FALSE;
992 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
993 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
995 if (is_esmtp && !regex_AUTH) regex_AUTH =
996 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
999 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1001 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1002 expand_nmax = -1; /* reset */
1004 /* Must not do this check until after we have saved the result of the
1005 regex match above. */
1007 if (require_auth == OK ||
1008 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1011 fail_reason = US"no common mechanisms were found";
1013 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1015 /* Scan the configured authenticators looking for one which is configured
1016 for use as a client, which is not suppressed by client_condition, and
1017 whose name matches an authentication mechanism supported by the server.
1018 If one is found, attempt to authenticate by calling its client function.
1021 for (au = auths; !smtp_authenticated && au; au = au->next)
1025 (au->client_condition != NULL &&
1026 !expand_check_condition(au->client_condition, au->name,
1027 US"client authenticator")))
1029 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1031 (au->client)? "client_condition is false" :
1032 "not configured as a client");
1036 /* Loop to scan supported server mechanisms */
1041 int len = Ustrlen(au->public_name);
1042 while (isspace(*p)) p++;
1044 if (strncmpic(au->public_name, p, len) != 0 ||
1045 (p[len] != 0 && !isspace(p[len])))
1047 while (*p != 0 && !isspace(*p)) p++;
1051 /* Found data for a listed mechanism. Call its client entry. Set
1052 a flag in the outblock so that data is overwritten after sending so
1053 that reflections don't show it. */
1055 fail_reason = US"authentication attempt(s) failed";
1056 obp->authenticating = TRUE;
1057 rc = (au->info->clientcode)(au, ibp, obp,
1058 ob->command_timeout, buffer, bufsize);
1059 obp->authenticating = FALSE;
1060 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1063 /* A temporary authentication failure must hold up delivery to
1064 this host. After a permanent authentication failure, we carry on
1065 to try other authentication methods. If all fail hard, try to
1066 deliver the message unauthenticated unless require_auth was set. */
1071 smtp_authenticated = TRUE; /* stops the outer loop */
1072 client_authenticator = au->name;
1073 if (au->set_client_id != NULL)
1074 client_authenticated_id = expand_string(au->set_client_id);
1077 /* Failure after writing a command */
1082 /* Failure after reading a response */
1085 if (errno != 0 || buffer[0] != '5') return FAIL;
1086 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1087 au->name, host->name, host->address, buffer);
1090 /* Failure by some other means. In effect, the authenticator
1091 decided it wasn't prepared to handle this case. Typically this
1092 is the result of "fail" in an expansion string. Do we need to
1093 log anything here? Feb 2006: a message is now put in the buffer
1094 if logging is required. */
1098 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1099 "authentication H=%s [%s] %s", au->name, host->name,
1100 host->address, buffer);
1103 /* Internal problem, message in buffer. */
1106 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1111 break; /* If not authenticated, try next authenticator */
1112 } /* Loop for scanning supported server mechanisms */
1113 } /* Loop for further authenticators */
1117 /* If we haven't authenticated, but are required to, give up. */
1119 if (require_auth == OK && !smtp_authenticated)
1121 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1122 string_sprintf("authentication required but %s", fail_reason), DEFER,
1131 /* Construct AUTH appendix string for MAIL TO */
1134 buffer to build string
1135 addrlist chain of potential addresses to deliver
1136 ob transport options
1138 Globals smtp_authenticated
1139 client_authenticated_sender
1140 Return True on error, otherwise buffer has (possibly empty) terminated string
1144 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1145 smtp_transport_options_block *ob)
1147 uschar *local_authenticated_sender = authenticated_sender;
1150 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1153 if (ob->authenticated_sender != NULL)
1155 uschar *new = expand_string(ob->authenticated_sender);
1158 if (!expand_string_forcedfail)
1160 uschar *message = string_sprintf("failed to expand "
1161 "authenticated_sender: %s", expand_string_message);
1162 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1166 else if (new[0] != 0) local_authenticated_sender = new;
1169 /* Add the authenticated sender address if present */
1171 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1172 local_authenticated_sender != NULL)
1174 string_format(buffer, bufsize, " AUTH=%s",
1175 auth_xtextencode(local_authenticated_sender,
1176 Ustrlen(local_authenticated_sender)));
1177 client_authenticated_sender = string_copy(local_authenticated_sender);
1187 #ifdef EXPERIMENTAL_DANE
1188 /* Lookup TLSA record for host/port.
1189 Return: OK success with dnssec; DANE mode
1190 DEFER Do not use this host now, may retry later
1191 FAIL_FORCED No TLSA record; DANE not usable
1192 FAIL Do not use this connection
1196 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1198 /* move this out to host.c given the similarity to dns_lookup() ? */
1200 const uschar * fullname = buffer;
1204 /* TLSA lookup string */
1205 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1207 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1208 sec = dns_is_secure(dnsa);
1210 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1220 return DEFER; /* just defer this TLS'd conn */
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
1224 return dane_required ? FAIL : FAIL_FORCED;
1228 return dane_required ? FAIL : DEFER;
1235 typedef struct smtp_compare_s
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1242 /* Create a unique string that identifies this message, it is based on
1243 sender_address, helo_data and tls_certificate if enabled.
1247 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249 address_item * addr1;
1250 uschar * if1 = US"";
1251 uschar * helo1 = US"";
1253 uschar * tlsc1 = US"";
1255 uschar * save_sender_address = sender_address;
1256 uschar * local_identity = NULL;
1257 smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1260 sender_address = sender;
1262 addr1 = deliver_make_addr (sender, TRUE);
1263 deliver_set_expansions(addr1);
1266 if1 = expand_string(ob->interface);
1269 helo1 = expand_string(ob->helo_data);
1272 if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276 local_identity = string_sprintf ("%s^%s", if1, helo1);
1279 deliver_set_expansions(NULL);
1280 sender_address = save_sender_address;
1282 return local_identity;
1287 /* This routine is a callback that is called from transport_check_waiting.
1288 This function will evaluate the incoming message versus the previous
1289 message. If the incoming message is using a different local identity then
1290 we will veto this new message. */
1293 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295 uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1299 current_local_identity =
1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1302 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1305 message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
1308 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1314 ehlo_response(uschar * buf, uschar checks)
1316 size_t bsize = Ustrlen(buf);
1319 if ( checks & OPTION_TLS
1320 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1321 checks &= ~OPTION_TLS;
1324 if ( checks & OPTION_IGNQ
1325 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~OPTION_IGNQ;
1329 if ( checks & OPTION_CHUNKING
1330 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~OPTION_CHUNKING;
1333 #ifndef DISABLE_PRDR
1334 if ( checks & OPTION_PRDR
1335 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~OPTION_PRDR;
1340 if ( checks & OPTION_UTF8
1341 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~OPTION_UTF8;
1345 if ( checks & OPTION_DSN
1346 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~OPTION_DSN;
1349 if ( checks & OPTION_PIPE
1350 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1351 PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~OPTION_PIPE;
1354 if ( checks & OPTION_SIZE
1355 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~OPTION_SIZE;
1363 /* Callback for emitting a BDAT data chunk header.
1365 If given a nonzero size, first flush any buffered SMTP commands
1366 then emit the command.
1368 Reap previous SMTP command responses if requested, and always reap
1369 the response from a previous BDAT command.
1372 tctx transport context
1373 chunk_size value for SMTP BDAT command
1375 tc_chunk_last add LAST option to SMTP BDAT command
1376 tc_reap_prev reap response to previous SMTP commands
1378 Returns: OK or ERROR
1382 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1385 smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 smtp_context * sx = tctx->smtp_context;
1391 /* Write SMTP chunk header command. If not reaping responses, note that
1392 there may be more writes (like, the chunk data) done soon. */
1396 if((cmd_count = smtp_write_command(&sx->outblock,
1397 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1398 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1399 ) < 0) return ERROR;
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1404 prev_cmd_count = cmd_count += sx->cmd_count;
1406 /* Reap responses for any previous, but not one we just emitted */
1410 if (sx->pending_BDAT)
1413 if (flags & tc_reap_prev && prev_cmd_count > 0)
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
1418 switch(sync_responses(sx, prev_cmd_count, 0))
1420 case 1: /* 2xx (only) => OK */
1421 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1429 if (!sx->pending_BDAT)
1430 pipelining_active = FALSE;
1433 /* Reap response for an outstanding BDAT */
1435 if (sx->pending_BDAT)
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1439 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1440 ob->command_timeout))
1442 if (errno == 0 && sx->buffer[0] == '4')
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1445 sx->addrlist->more_errno |=
1446 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1451 sx->pending_BDAT = FALSE;
1452 pipelining_active = FALSE;
1454 else if (chunk_size > 0)
1455 sx->pending_BDAT = TRUE;
1458 sx->cmd_count = cmd_count;
1464 /*************************************************
1465 * Make connection for given message *
1466 *************************************************/
1470 ctx connection context
1471 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1472 a second attempt after TLS initialization fails
1474 Returns: OK - the connection was made and the delivery attempted;
1475 fd is set in the conn context, tls_out set up.
1476 DEFER - the connection could not be made, or something failed
1477 while setting up the SMTP session, or there was a
1478 non-message-specific error, such as a timeout.
1479 ERROR - helo_data or add_headers or authenticated_sender is
1480 specified for this transport, and the string failed
1484 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1486 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1487 dns_answer tlsa_dnsa;
1489 BOOL pass_message = FALSE;
1490 uschar * message = NULL;
1494 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1496 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1497 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1499 sx->send_rset = TRUE;
1500 sx->send_quit = TRUE;
1501 sx->setting_up = TRUE;
1503 sx->esmtp_sent = FALSE;
1505 sx->utf8_needed = FALSE;
1507 sx->dsn_all_lasthop = TRUE;
1508 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1510 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1513 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1514 sx->peer_offered = 0;
1515 sx->avoid_option = 0;
1516 sx->igquotstr = US"";
1517 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1518 #ifdef EXPERIMENTAL_DSN_INFO
1519 sx->smtp_greeting = NULL;
1520 sx->helo_response = NULL;
1523 smtp_command = US"initial connection";
1524 sx->buffer[0] = '\0';
1526 /* Set up the buffer for reading SMTP response packets. */
1528 sx->inblock.buffer = sx->inbuffer;
1529 sx->inblock.buffersize = sizeof(sx->inbuffer);
1530 sx->inblock.ptr = sx->inbuffer;
1531 sx->inblock.ptrend = sx->inbuffer;
1533 /* Set up the buffer for holding SMTP commands while pipelining */
1535 sx->outblock.buffer = sx->outbuffer;
1536 sx->outblock.buffersize = sizeof(sx->outbuffer);
1537 sx->outblock.ptr = sx->outbuffer;
1538 sx->outblock.cmd_count = 0;
1539 sx->outblock.authenticating = FALSE;
1541 /* Reset the parameters of a TLS session. */
1544 tls_out.cipher = NULL; /* the one we may use for this transport */
1545 tls_out.ourcert = NULL;
1546 tls_out.peercert = NULL;
1547 tls_out.peerdn = NULL;
1548 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1551 tls_out.ocsp = OCSP_NOT_REQ;
1553 /* Flip the legacy TLS-related variables over to the outbound set in case
1554 they're used in the context of the transport. Don't bother resetting
1555 afterward (when being used by a transport) as we're in a subprocess.
1556 For verify, unflipped once the callout is dealt with */
1558 tls_modify_variables(&tls_out);
1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1569 /* Make a connection to the host if this isn't a continued delivery, and handle
1570 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571 specially so they can be identified for retries. */
1573 if (!continue_hostname)
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1578 /* Get the actual port the connection will use, into sx->host */
1580 smtp_port_for_connect(sx->host, sx->port);
1582 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1583 /* Do TLSA lookup for DANE */
1585 tls_out.dane_verified = FALSE;
1586 tls_out.tlsa_usage = 0;
1588 if (sx->host->dnssec == DS_YES)
1590 if( sx->dane_required
1591 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1593 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1595 case OK: sx->dane = TRUE;
1596 sx->ob->tls_tempfail_tryclear = FALSE;
1598 case FAIL_FORCED: break;
1599 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1600 string_sprintf("DANE error: tlsa lookup %s",
1601 rc == DEFER ? "DEFER" : "FAIL"),
1606 else if (sx->dane_required)
1608 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1609 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1616 /* Make the TCP connection */
1618 sx->inblock.sock = sx->outblock.sock =
1619 smtp_connect(sx->host, sx->host_af, sx->interface,
1620 sx->ob->connect_timeout, sx->tblock);
1622 if (sx->inblock.sock < 0)
1624 uschar * msg = NULL;
1627 msg = US strerror(errno);
1628 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1630 set_errno_nohost(sx->addrlist,
1631 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1632 sx->verify ? string_sprintf("could not connect: %s", msg)
1635 sx->send_quit = FALSE;
1639 /* Expand the greeting message while waiting for the initial response. (Makes
1640 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1641 delayed till here so that $sending_interface and $sending_port are set. */
1644 if (!(sx->helo_data = expand_string(sx->helo_data)))
1646 log_write(0, LOG_MAIN|LOG_PANIC,
1647 "<%s>: failed to expand transport's helo_data value for callout: %s",
1648 sx->addrlist->address, expand_string_message);
1653 expand_string_message = NULL;
1654 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1655 &expand_string_message)),
1656 expand_string_message)
1658 log_write(0, LOG_MAIN|LOG_PANIC,
1659 "<%s>: failed to expand transport's helo_data value for callout: %s",
1660 sx->addrlist->address, expand_string_message);
1662 sx->helo_data = NULL;
1666 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1667 is nevertheless a reasonably clean way of programming this kind of logic,
1668 where you want to escape on any error. */
1675 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1677 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1678 '2', sx->ob->command_timeout);
1679 #ifdef EXPERIMENTAL_DSN_INFO
1680 sx->smtp_greeting = string_copy(sx->buffer);
1682 if (!good_response) goto RESPONSE_FAILED;
1684 #ifndef DISABLE_EVENT
1687 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1688 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1689 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1692 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1693 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1701 /* Now check if the helo_data expansion went well, and sign off cleanly if
1706 message = string_sprintf("failed to expand helo_data: %s",
1707 expand_string_message);
1708 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1714 /** Debugging without sending a message
1715 sx->addrlist->transport_return = DEFER;
1719 /* Errors that occur after this point follow an SMTP command, which is
1720 left in big_buffer by smtp_write_command() for use in error messages. */
1722 smtp_command = big_buffer;
1724 /* Tell the remote who we are...
1726 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1727 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1728 greeting is of this form. The assumption was that the far end supports it
1729 properly... but experience shows that there are some that give 5xx responses,
1730 even though the banner includes "ESMTP" (there's a bloody-minded one that
1731 says "ESMTP not spoken here"). Cope with that case.
1733 September 2000: Time has passed, and it seems reasonable now to always send
1734 EHLO at the start. It is also convenient to make the change while installing
1737 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1738 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1739 would be no way to send out the mails, so there is now a host list
1740 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1741 PIPELINING problem as well. Maybe it can also be useful to cure other
1742 problems with broken servers.
1744 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1745 Then somebody tried it with a Microsoft mailer... It seems that all other
1746 mailers use upper case for some reason (the RFC is quite clear about case
1747 independence) so, for peace of mind, I gave in. */
1749 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1751 /* Alas; be careful, since this goto is not an error-out, so conceivably
1752 we might set data between here and the target which we assume to exist
1753 and be usable. I can see this coming back to bite us. */
1757 smtp_peer_options |= OPTION_TLS;
1758 suppress_tls = FALSE;
1759 sx->ob->tls_tempfail_tryclear = FALSE;
1760 smtp_command = US"SSL-on-connect";
1767 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1768 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1770 sx->esmtp_sent = TRUE;
1771 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1772 sx->ob->command_timeout))
1774 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1776 #ifdef EXPERIMENTAL_DSN_INFO
1777 sx->helo_response = string_copy(sx->buffer);
1779 goto RESPONSE_FAILED;
1783 #ifdef EXPERIMENTAL_DSN_INFO
1784 sx->helo_response = string_copy(sx->buffer);
1789 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1794 int n = sizeof(sx->buffer);
1795 uschar * rsp = sx->buffer;
1797 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1798 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1800 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1802 good_response = smtp_read_response(&sx->inblock, rsp, n,
1803 '2', sx->ob->command_timeout);
1804 #ifdef EXPERIMENTAL_DSN_INFO
1805 sx->helo_response = string_copy(rsp);
1809 /* Handle special logging for a closed connection after HELO
1810 when had previously sent EHLO */
1812 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1814 errno = ERRNO_SMTPCLOSED;
1815 goto EHLOHELO_FAILED;
1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1818 goto RESPONSE_FAILED;
1822 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1824 if (sx->esmtp || sx->lmtp)
1826 sx->peer_offered = ehlo_response(sx->buffer,
1827 OPTION_TLS /* others checked later */
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1833 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1838 /* For continuing deliveries down the same channel, having re-exec'd the socket
1839 is the standard input; for a socket held open from verify it is recorded
1840 in the cutthrough context block. Either way we don't need to redo EHLO here
1841 (but may need to do so for TLS - see below).
1842 Set up the pointer to where subsequent commands will be left, for
1843 error messages. Note that smtp_peer_options will have been
1844 set from the command line if they were set in the process that passed the
1847 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1848 as the continue goes via transport_pass_socket() and doublefork and exec.
1849 It does not wait. Unclear how we keep separate host's responses
1850 separate - we could match up by host ip+port as a bodge. */
1854 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1856 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1857 sx->host->port = sx->port = cutthrough.host.port;
1861 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1862 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1864 smtp_command = big_buffer;
1865 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1867 /* For a continued connection with TLS being proxied for us, or a
1868 held-open verify connection with TLS, nothing more to do. */
1870 if ( continue_proxy_cipher
1871 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1874 sx->peer_offered = smtp_peer_options;
1875 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1876 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1877 continue_proxy_cipher ? "proxied" : "verify conn with");
1880 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1883 /* If TLS is available on this connection, whether continued or not, attempt to
1884 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1885 send another EHLO - the server may give a different answer in secure mode. We
1886 use a separate buffer for reading the response to STARTTLS so that if it is
1887 negative, the original EHLO data is available for subsequent analysis, should
1888 the client not be required to use TLS. If the response is bad, copy the buffer
1889 for error analysis. */
1892 if ( smtp_peer_options & OPTION_TLS
1894 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1896 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1899 uschar buffer2[4096];
1900 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1903 /* If there is an I/O error, transmission of this message is deferred. If
1904 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1905 false, we also defer. However, if there is a temporary rejection of STARTTLS
1906 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1907 STARTTLS, we carry on. This means we will try to send the message in clear,
1908 unless the host is in hosts_require_tls (tested below). */
1910 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1911 sx->ob->command_timeout))
1915 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1918 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1919 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1920 goto RESPONSE_FAILED;
1924 /* STARTTLS accepted: try to negotiate a TLS session. */
1929 address_item * addr;
1931 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1932 # ifdef EXPERIMENTAL_DANE
1933 sx->dane ? &tlsa_dnsa : NULL,
1937 /* TLS negotiation failed; give an error. From outside, this function may
1938 be called again to try in clear on a new connection, if the options permit
1939 it for this host. */
1943 # ifdef EXPERIMENTAL_DANE
1944 if (sx->dane) log_write(0, LOG_MAIN,
1945 "DANE attempt failed; TLS connection to %s [%s]: %s",
1946 sx->host->name, sx->host->address, errstr);
1949 errno = ERRNO_TLSFAILURE;
1950 message = string_sprintf("TLS session: %s", errstr);
1951 sx->send_quit = FALSE;
1955 /* TLS session is set up */
1957 smtp_peer_options_wrap = smtp_peer_options;
1958 for (addr = sx->addrlist; addr; addr = addr->next)
1959 if (addr->transport_return == PENDING_DEFER)
1961 addr->cipher = tls_out.cipher;
1962 addr->ourcert = tls_out.ourcert;
1963 addr->peercert = tls_out.peercert;
1964 addr->peerdn = tls_out.peerdn;
1965 addr->ocsp = tls_out.ocsp;
1970 /* if smtps, we'll have smtp_command set to something else; always safe to
1972 smtp_command = big_buffer;
1974 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1975 helo_data is null, we are dealing with a connection that was passed from
1976 another process, and so we won't have expanded helo_data above. We have to
1977 expand it here. $sending_ip_address and $sending_port are set up right at the
1978 start of the Exim process (in exim.c). */
1980 if (tls_out.active >= 0)
1985 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1987 uschar *message = string_sprintf("failed to expand helo_data: %s",
1988 expand_string_message);
1989 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1994 /* For SMTPS we need to wait for the initial OK response. */
1997 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1998 '2', sx->ob->command_timeout);
1999 #ifdef EXPERIMENTAL_DSN_INFO
2000 sx->smtp_greeting = string_copy(sx->buffer);
2002 if (!good_response) goto RESPONSE_FAILED;
2006 greeting_cmd = "EHLO";
2009 greeting_cmd = "HELO";
2011 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2014 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2015 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2017 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2018 '2', sx->ob->command_timeout);
2019 #ifdef EXPERIMENTAL_DSN_INFO
2020 sx->helo_response = string_copy(sx->buffer);
2022 if (!good_response) goto RESPONSE_FAILED;
2023 smtp_peer_options = 0;
2026 /* If the host is required to use a secure channel, ensure that we
2030 # ifdef EXPERIMENTAL_DANE
2033 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2036 errno = ERRNO_TLSREQUIRED;
2037 message = string_sprintf("a TLS session is required, but %s",
2038 smtp_peer_options & OPTION_TLS
2039 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2042 #endif /*SUPPORT_TLS*/
2044 /* If TLS is active, we have just started it up and re-done the EHLO command,
2045 so its response needs to be analyzed. If TLS is not active and this is a
2046 continued session down a previously-used socket, we haven't just done EHLO, so
2049 if (continue_hostname == NULL
2051 || tls_out.active >= 0
2055 if (sx->esmtp || sx->lmtp)
2057 sx->peer_offered = ehlo_response(sx->buffer,
2059 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2063 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2064 /*XXX if we hand peercaps on to continued-conn processes,
2065 must not depend on this addr */
2069 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2072 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2073 lmtp_ignore_quota option was set. */
2075 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2077 /* If the response to EHLO specified support for the SIZE parameter, note
2078 this, provided size_addition is non-negative. */
2080 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2082 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2083 the current host, esmtp will be false, so PIPELINING can never be used. If
2084 the current host matches hosts_avoid_pipelining, don't do it. */
2086 if ( sx->peer_offered & OPTION_PIPE
2087 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2088 smtp_peer_options |= OPTION_PIPE;
2090 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2091 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2093 if ( sx->peer_offered & OPTION_CHUNKING
2094 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2095 sx->peer_offered &= ~OPTION_CHUNKING;
2097 if (sx->peer_offered & OPTION_CHUNKING)
2098 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2100 #ifndef DISABLE_PRDR
2101 if ( sx->peer_offered & OPTION_PRDR
2102 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2103 sx->peer_offered &= ~OPTION_PRDR;
2105 if (sx->peer_offered & OPTION_PRDR)
2106 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2109 /* Note if the server supports DSN */
2110 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2111 DEBUG(D_transport) debug_printf("%susing DSN\n",
2112 sx->peer_offered & OPTION_DSN ? "" : "not ");
2114 /* Note if the response to EHLO specifies support for the AUTH extension.
2115 If it has, check that this host is one we want to authenticate to, and do
2116 the business. The host name and address must be available when the
2117 authenticator's client driver is running. */
2119 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2120 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2122 default: goto SEND_QUIT;
2124 case FAIL_SEND: goto SEND_FAILED;
2125 case FAIL: goto RESPONSE_FAILED;
2129 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2131 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2132 message-specific. */
2134 sx->setting_up = FALSE;
2137 if (sx->addrlist->prop.utf8_msg)
2139 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2140 && !sx->addrlist->prop.utf8_downcvt_maybe;
2141 DEBUG(D_transport) if (!sx->utf8_needed)
2142 debug_printf("utf8: %s downconvert\n",
2143 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2146 /* If this is an international message we need the host to speak SMTPUTF8 */
2147 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2149 errno = ERRNO_UTF8_FWD;
2150 goto RESPONSE_FAILED;
2162 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2163 sx->buffer, &code, &message, &pass_message);
2168 message = US string_sprintf("send() to %s [%s] failed: %s",
2169 sx->host->name, sx->host->address, strerror(errno));
2170 sx->send_quit = FALSE;
2173 /* This label is jumped to directly when a TLS negotiation has failed,
2174 or was not done for a host for which it is required. Values will be set
2175 in message and errno, and setting_up will always be true. Treat as
2176 a temporary error. */
2180 message = string_sprintf("Remote host closed connection in response to %s"
2181 " (EHLO response was: %s)", smtp_command, sx->buffer);
2182 sx->send_quit = FALSE;
2191 /* The failure happened while setting up the call; see if the failure was
2192 a 5xx response (this will either be on connection, or following HELO - a 5xx
2193 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2194 fail all addresses, as this host is never going to accept them. For other
2195 errors during setting up (timeouts or whatever), defer all addresses, and
2196 yield DEFER, so that the host is not tried again for a while.
2198 XXX This peeking for another host feels like a layering violation. We want
2199 to note the host as unusable, but down here we shouldn't know if this was
2200 the last host to try for the addr(list). Perhaps the upper layer should be
2201 the one to do set_errno() ? The problem is that currently the addr is where
2202 errno etc. are stashed, but until we run out of hosts to try the errors are
2203 host-specific. Maybe we should enhance the host_item definition? */
2206 sx->ok = FALSE; /* For when reached by GOTO */
2207 set_errno(sx->addrlist, errno, message,
2212 || errno == ERRNO_UTF8_FWD
2215 pass_message, sx->host
2216 #ifdef EXPERIMENTAL_DSN_INFO
2217 , sx->smtp_greeting, sx->helo_response
2227 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2230 tls_close(FALSE, TRUE);
2233 /* Close the socket, and return the appropriate value, first setting
2234 works because the NULL setting is passed back to the calling process, and
2235 remote_max_parallel is forced to 1 when delivering over an existing connection,
2238 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2241 shutdown(sx->outblock.sock, SHUT_WR);
2242 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2243 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2244 rc--; /* drain socket */
2245 sx->send_quit = FALSE;
2247 (void)close(sx->inblock.sock);
2248 sx->inblock.sock = sx->outblock.sock = -1;
2250 #ifndef DISABLE_EVENT
2251 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2254 continue_transport = NULL;
2255 continue_hostname = NULL;
2262 /* Create the string of options that will be appended to the MAIL FROM:
2263 in the connection context buffer */
2266 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2268 uschar * p = sx->buffer;
2269 address_item * addr;
2274 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2275 send it, adding something to the message size to allow for imprecision
2276 and things that get added en route. Exim keeps the number of lines
2277 in a message, so we can give an accurate value for the original message, but we
2278 need some additional to handle added headers. (Double "." characters don't get
2279 included in the count.) */
2281 if ( message_size > 0
2282 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2284 /*XXX problem here under spool_files_wireformat?
2285 Or just forget about lines? Or inflate by a fixed proportion? */
2287 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2291 #ifndef DISABLE_PRDR
2292 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2295 sx->prdr_active = FALSE;
2296 if (sx->peer_offered & OPTION_PRDR)
2297 for (addr = addrlist; addr; addr = addr->next)
2298 if (addr->transport_return == PENDING_DEFER)
2300 for (addr = addr->next; addr; addr = addr->next)
2301 if (addr->transport_return == PENDING_DEFER)
2302 { /* at least two recipients to send */
2303 sx->prdr_active = TRUE;
2304 sprintf(CS p, " PRDR"); p += 5;
2312 /* If it supports internationalised messages, and this meesage need that,
2315 if ( sx->peer_offered & OPTION_UTF8
2316 && addrlist->prop.utf8_msg
2317 && !addrlist->prop.utf8_downcvt
2319 Ustrcpy(p, " SMTPUTF8"), p += 9;
2322 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2323 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2324 addr && address_count < sx->max_rcpt;
2325 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2328 if (!(addr->dsn_flags & rf_dsnlasthop))
2330 sx->dsn_all_lasthop = FALSE;
2335 /* Add any DSN flags to the mail command */
2337 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2339 if (dsn_ret == dsn_ret_hdrs)
2340 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2341 else if (dsn_ret == dsn_ret_full)
2342 { Ustrcpy(p, " RET=FULL"); p += 9; }
2346 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2351 /* If an authenticated_sender override has been specified for this transport
2352 instance, expand it. If the expansion is forced to fail, and there was already
2353 an authenticated_sender for this message, the original value will be used.
2354 Other expansion failures are serious. An empty result is ignored, but there is
2355 otherwise no check - this feature is expected to be used with LMTP and other
2356 cases where non-standard addresses (e.g. without domains) might be required. */
2358 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2366 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2368 uschar * p = sx->buffer;
2371 /* Add any DSN flags to the rcpt command */
2373 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2375 if (addr->dsn_flags & rf_dsnflags)
2380 Ustrcpy(p, " NOTIFY=");
2382 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2384 if (!first) *p++ = ',';
2386 Ustrcpy(p, rf_names[i]);
2391 if (addr->dsn_orcpt)
2393 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2404 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2405 -1 MAIL response error
2406 -2 any non-MAIL read i/o error
2407 -3 non-MAIL response timeout
2408 -4 internal error; channel still usable
2413 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2415 address_item * addr;
2419 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2425 /* From here until we send the DATA command, we can make use of PIPELINING
2426 if the server host supports it. The code has to be able to check the responses
2427 at any point, for when the buffer fills up, so we write it totally generally.
2428 When PIPELINING is off, each command written reports that it has flushed the
2431 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2434 uschar * s = sx->from_addr;
2436 uschar * errstr = NULL;
2438 /* If we must downconvert, do the from-address here. Remember we had to
2439 for the to-addresses (done below), and also (ugly) for re-doing when building
2440 the delivery log line. */
2442 if ( sx->addrlist->prop.utf8_msg
2443 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2446 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2448 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2452 setflag(sx->addrlist, af_utf8_downcvt);
2456 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2457 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2460 mail_command = string_copy(big_buffer); /* Save for later error message */
2464 case -1: /* Transmission error */
2467 case +1: /* Cmd was sent */
2468 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2469 sx->ob->command_timeout))
2471 if (errno == 0 && sx->buffer[0] == '4')
2473 errno = ERRNO_MAIL4XX;
2474 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2478 sx->pending_MAIL = FALSE;
2481 /* otherwise zero: command queued for pipeline */
2484 /* Pass over all the relevant recipient addresses for this host, which are the
2485 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2486 several before we have to read the responses for those seen so far. This
2487 checking is done by a subroutine because it also needs to be done at the end.
2488 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2489 the next one if not all are sent.
2491 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2492 last address because we want to abort if any recipients have any kind of
2493 problem, temporary or permanent. We know that all recipient addresses will have
2494 the PENDING_DEFER status, because only one attempt is ever made, and we know
2495 that max_rcpt will be large, so all addresses will be done at once.
2497 For verify we flush the pipeline after any (the only) rcpt address. */
2499 for (addr = sx->first_addr, address_count = 0;
2500 addr && address_count < sx->max_rcpt;
2501 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2507 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2508 setflag(addr, af_tcp_fastopen);
2510 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2511 ? dsn_support_yes : dsn_support_no;
2514 no_flush = pipelining_active && !sx->verify
2515 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2517 build_rcptcmd_options(sx, addr);
2519 /* Now send the RCPT command, and process outstanding responses when
2520 necessary. After a timeout on RCPT, we just end the function, leaving the
2521 yield as OK, because this error can often mean that there is a problem with
2522 just one address, so we don't want to delay the host. */
2524 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2527 if ( testflag(sx->addrlist, af_utf8_downcvt)
2528 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2531 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2532 errno = ERRNO_EXPANDFAIL;
2533 return -5; /*XXX too harsh? */
2537 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2538 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2540 if (count < 0) return -5;
2543 switch(sync_responses(sx, count, 0))
2545 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2546 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2549 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2550 if (!sx->lmtp) /* can't tell about progress yet */
2551 sx->completed_addr = TRUE;
2552 case 0: /* No 2xx or 5xx, but no probs */
2555 case -1: return -3; /* Timeout on RCPT */
2556 case -2: return -2; /* non-MAIL read i/o error */
2557 default: return -1; /* any MAIL error */
2559 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2561 } /* Loop for next address */
2563 tcp_out_fastopen_logged = TRUE;
2564 sx->next_addr = addr;
2570 /*****************************************************
2571 * Proxy TLS connection for another transport process *
2572 ******************************************************/
2574 Use the given buffer as a staging area, and select on both the given fd
2575 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2576 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2580 buf space to use for buffering
2581 bufsiz size of buffer
2582 proxy_fd comms to proxied process
2583 timeout per-read timeout, seconds
2587 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2590 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2591 int rc, i, fd_bits, nbytes;
2593 set_process_info("proxying TLS connection for continued transport");
2595 FD_SET(tls_out.active, &rfds);
2596 FD_SET(proxy_fd, &rfds);
2598 for (fd_bits = 3; fd_bits; )
2600 time_t time_left = timeout;
2601 time_t time_start = time(NULL);
2607 struct timeval tv = { time_left, 0 };
2610 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2612 if (rc < 0 && errno == EINTR)
2613 if ((time_left -= time(NULL) - time_start) > 0) continue;
2617 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2621 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2623 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2624 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2628 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2630 /* handle inbound data */
2631 if (FD_ISSET(tls_out.active, &rfds))
2632 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2635 FD_CLR(tls_out.active, &rfds);
2636 shutdown(proxy_fd, SHUT_WR);
2641 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2642 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2644 else if (fd_bits & 1)
2645 FD_SET(tls_out.active, &rfds);
2647 /* handle outbound data */
2648 if (FD_ISSET(proxy_fd, &rfds))
2649 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2652 tls_close(FALSE, TRUE);
2656 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2657 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2660 else if (fd_bits & 2)
2661 FD_SET(proxy_fd, &rfds);
2667 /*************************************************
2668 * Deliver address list to given host *
2669 *************************************************/
2671 /* If continue_hostname is not null, we get here only when continuing to
2672 deliver down an existing channel. The channel was passed as the standard
2673 input. TLS is never active on a passed channel; the previous process always
2674 closes it down before passing the connection on.
2676 Otherwise, we have to make a connection to the remote host, and do the
2677 initial protocol exchange.
2679 When running as an MUA wrapper, if the sender or any recipient is rejected,
2680 temporarily or permanently, we force failure for all recipients.
2683 addrlist chain of potential addresses to deliver; only those whose
2684 transport_return field is set to PENDING_DEFER are currently
2685 being processed; others should be skipped - they have either
2686 been delivered to an earlier host or IP address, or been
2687 failed by one of them.
2688 host host to deliver to
2689 host_af AF_INET or AF_INET6
2690 defport default TCP/IP port to use if host does not specify, in host
2692 interface interface to bind to, or NULL
2693 tblock transport instance block
2694 message_defer set TRUE if yield is OK, but all addresses were deferred
2695 because of a non-recipient, non-host failure, that is, a
2696 4xx response to MAIL FROM, DATA, or ".". This is a defer
2697 that is specific to the message.
2698 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2699 a second attempt after TLS initialization fails
2701 Returns: OK - the connection was made and the delivery attempted;
2702 the result for each address is in its data block.
2703 DEFER - the connection could not be made, or something failed
2704 while setting up the SMTP session, or there was a
2705 non-message-specific error, such as a timeout.
2706 ERROR - a filter command is specified for this transport,
2707 and there was a problem setting it up; OR helo_data
2708 or add_headers or authenticated_sender is specified
2709 for this transport, and the string failed to expand
2713 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2714 uschar *interface, transport_instance *tblock,
2715 BOOL *message_defer, BOOL suppress_tls)
2721 struct timeval start_delivery_time;
2723 BOOL pass_message = FALSE;
2724 uschar *message = NULL;
2725 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2729 gettimeofday(&start_delivery_time, NULL);
2730 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2731 *message_defer = FALSE;
2733 sx.addrlist = addrlist;
2735 sx.host_af = host_af,
2737 sx.interface = interface;
2738 sx.helo_data = NULL;
2742 /* Get the channel set up ready for a message (MAIL FROM being the next
2743 SMTP command to send */
2745 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2748 /* If there is a filter command specified for this transport, we can now
2749 set it up. This cannot be done until the identify of the host is known. */
2751 if (tblock->filter_command)
2753 transport_filter_timeout = tblock->filter_timeout;
2755 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2758 if (!transport_set_up_command(&transport_filter_argv,
2759 tblock->filter_command, TRUE, DEFER, addrlist,
2760 string_sprintf("%.50s transport", tblock->name), NULL))
2762 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2768 if ( transport_filter_argv
2769 && *transport_filter_argv
2770 && **transport_filter_argv
2771 && sx.peer_offered & OPTION_CHUNKING
2774 sx.peer_offered &= ~OPTION_CHUNKING;
2775 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2779 sx.first_addr = addrlist;
2781 /* For messages that have more than the maximum number of envelope recipients,
2782 we want to send several transactions down the same SMTP connection. (See
2783 comments in deliver.c as to how this reconciles, heuristically, with
2784 remote_max_parallel.) This optimization was added to Exim after the following
2785 code was already working. The simplest way to put it in without disturbing the
2786 code was to use a goto to jump back to this point when there is another
2787 transaction to handle. */
2790 sx.from_addr = return_path;
2791 sx.sync_addr = sx.first_addr;
2793 sx.send_rset = TRUE;
2794 sx.completed_addr = FALSE;
2797 /* If we are a continued-connection-after-verify the MAIL and RCPT
2798 commands were already sent; do not re-send but do mark the addrs as
2799 having been accepted up to RCPT stage. A traditional cont-conn
2800 always has a sequence number greater than one. */
2802 if (continue_hostname && continue_sequence == 1)
2804 address_item * addr;
2806 sx.peer_offered = smtp_peer_options;
2807 sx.pending_MAIL = FALSE;
2809 sx.next_addr = NULL;
2811 for (addr = addrlist; addr; addr = addr->next)
2812 addr->transport_return = PENDING_OK;
2816 /* Initiate a message transfer. */
2818 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2821 case -1: case -2: goto RESPONSE_FAILED;
2822 case -3: goto END_OFF;
2823 case -4: goto SEND_QUIT;
2824 default: goto SEND_FAILED;
2827 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2828 permanently or temporarily. We should have flushed and synced after the last
2836 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2837 if (a->transport_return != PENDING_OK)
2839 /*XXX could we find a better errno than 0 here? */
2840 set_errno_nohost(addrlist, 0, a->message, FAIL,
2841 testflag(a, af_pass_message));
2848 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2849 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2850 have a good recipient buffered up if we are pipelining. We don't want to waste
2851 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2852 are pipelining. The responses are all handled by sync_responses().
2853 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2856 if ( !(sx.peer_offered & OPTION_CHUNKING)
2857 && (sx.ok || (pipelining_active && !mua_wrapper)))
2859 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2861 if (count < 0) goto SEND_FAILED;
2862 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2864 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2865 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2868 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2869 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2870 case 0: break; /* No 2xx or 5xx, but no probs */
2872 case -1: goto END_OFF; /* Timeout on RCPT */
2873 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2875 pipelining_active = FALSE;
2876 data_command = string_copy(big_buffer); /* Save for later error message */
2879 /* If there were no good recipients (but otherwise there have been no
2880 problems), just set ok TRUE, since we have handled address-specific errors
2881 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2882 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2883 well as body. Set the appropriate timeout value to be used for each chunk.
2884 (Haven't been able to make it work using select() for writing yet.) */
2886 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2888 /* Save the first address of the next batch. */
2889 sx.first_addr = sx.next_addr;
2895 transport_ctx tctx = {
2899 US".", US"..", /* Escaping strings */
2900 topt_use_crlf | topt_escape_headers
2901 | (tblock->body_only ? topt_no_headers : 0)
2902 | (tblock->headers_only ? topt_no_body : 0)
2903 | (tblock->return_path_add ? topt_add_return_path : 0)
2904 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2905 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2908 /* If using CHUNKING we need a callback from the generic transport
2909 support to us, for the sending of BDAT smtp commands and the reaping
2910 of responses. The callback needs a whole bunch of state so set up
2911 a transport-context structure to be passed around. */
2913 if (sx.peer_offered & OPTION_CHUNKING)
2915 tctx.check_string = tctx.escape_string = NULL;
2916 tctx.options |= topt_use_bdat;
2917 tctx.chunk_cb = smtp_chunk_cmd_callback;
2918 sx.pending_BDAT = FALSE;
2919 sx.good_RCPT = sx.ok;
2921 tctx.smtp_context = &sx;
2924 tctx.options |= topt_end_dot;
2926 /* Save the first address of the next batch. */
2927 sx.first_addr = sx.next_addr;
2929 /* Responses from CHUNKING commands go in buffer. Otherwise,
2930 there has not been a response. */
2934 sigalrm_seen = FALSE;
2935 transport_write_timeout = sx.ob->data_timeout;
2936 smtp_command = US"sending data block"; /* For error messages */
2937 DEBUG(D_transport|D_v)
2938 if (sx.peer_offered & OPTION_CHUNKING)
2939 debug_printf(" will write message using CHUNKING\n");
2941 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2942 transport_count = 0;
2944 #ifndef DISABLE_DKIM
2945 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2947 sx.ok = transport_write_message(&tctx, 0);
2950 /* transport_write_message() uses write() because it is called from other
2951 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2952 it can exit with "Broken pipe" as its error. This really means that the
2953 socket got closed at the far end. */
2955 transport_write_timeout = 0; /* for subsequent transports */
2957 /* Failure can either be some kind of I/O disaster (including timeout),
2958 or the failure of a transport filter or the expansion of added headers.
2959 Or, when CHUNKING, it can be a protocol-detected failure. */
2962 if (message) goto SEND_FAILED;
2963 else goto RESPONSE_FAILED;
2965 /* We used to send the terminating "." explicitly here, but because of
2966 buffering effects at both ends of TCP/IP connections, you don't gain
2967 anything by keeping it separate, so it might as well go in the final
2968 data buffer for efficiency. This is now done by setting the topt_end_dot
2971 smtp_command = US"end of data";
2973 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2975 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2976 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2978 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2979 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2982 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2983 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2984 case 0: break; /* No 2xx or 5xx, but no probs */
2986 case -1: goto END_OFF; /* Timeout on RCPT */
2987 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2991 #ifndef DISABLE_PRDR
2992 /* For PRDR we optionally get a partial-responses warning
2993 * followed by the individual responses, before going on with
2994 * the overall response. If we don't get the warning then deal
2995 * with per non-PRDR. */
2998 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2999 sx.ob->final_timeout);
3000 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3002 case '2': sx.prdr_active = FALSE;
3005 case '4': errno = ERRNO_DATA4XX;
3006 addrlist->more_errno |=
3007 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3014 /* For non-PRDR SMTP, we now read a single response that applies to the
3015 whole message. If it is OK, then all the addresses have been delivered. */
3019 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3020 sx.ob->final_timeout);
3021 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3023 errno = ERRNO_DATA4XX;
3024 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3028 /* For LMTP, we get back a response for every RCPT command that we sent;
3029 some may be accepted and some rejected. For those that get a response, their
3030 status is fixed; any that are accepted have been handed over, even if later
3031 responses crash - at least, that's how I read RFC 2033.
3033 If all went well, mark the recipient addresses as completed, record which
3034 host/IPaddress they were delivered to, and cut out RSET when sending another
3035 message down the same channel. Write the completed addresses to the journal
3036 now so that they are recorded in case there is a crash of hardware or
3037 software before the spool gets updated. Also record the final SMTP
3038 confirmation if needed (for SMTP only). */
3043 struct timeval delivery_time;
3045 uschar * conf = NULL;
3047 timesince(&delivery_time, &start_delivery_time);
3048 sx.send_rset = FALSE;
3049 pipelining_active = FALSE;
3051 /* Set up confirmation if needed - applies only to SMTP */
3054 #ifdef DISABLE_EVENT
3055 LOGGING(smtp_confirmation) &&
3060 const uschar *s = string_printing(sx.buffer);
3061 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3062 conf = (s == sx.buffer)? US string_copy(s) : US s;
3065 /* Process all transported addresses - for LMTP or PRDR, read a status for
3068 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3070 if (addr->transport_return != PENDING_OK) continue;
3072 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3073 remaining addresses. Otherwise, it's a return code for just the one
3074 address. For temporary errors, add a retry item for the address so that
3075 it doesn't get tried again too soon. */
3077 #ifndef DISABLE_PRDR
3078 if (sx.lmtp || sx.prdr_active)
3083 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3084 sx.ob->final_timeout))
3086 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3087 addr->message = string_sprintf(
3088 #ifndef DISABLE_PRDR
3089 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3091 "LMTP error after %s: %s",
3093 data_command, string_printing(sx.buffer));
3094 setflag(addr, af_pass_message); /* Allow message to go to user */
3095 if (sx.buffer[0] == '5')
3096 addr->transport_return = FAIL;
3099 errno = ERRNO_DATA4XX;
3100 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3101 addr->transport_return = DEFER;
3102 #ifndef DISABLE_PRDR
3103 if (!sx.prdr_active)
3105 retry_add_item(addr, addr->address_retry_key, 0);
3109 sx.completed_addr = TRUE; /* NOW we can set this flag */
3110 if (LOGGING(smtp_confirmation))
3112 const uschar *s = string_printing(sx.buffer);
3113 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3114 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3118 /* SMTP, or success return from LMTP for this address. Pass back the
3119 actual host that was used. */
3121 addr->transport_return = OK;
3122 addr->more_errno = delivery_time.tv_sec;
3123 addr->delivery_usec = delivery_time.tv_usec;
3124 addr->host_used = host;
3125 addr->special_action = flag;
3126 addr->message = conf;
3127 #ifndef DISABLE_PRDR
3128 if (sx.prdr_active) setflag(addr, af_prdr_used);
3130 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3133 #ifndef DISABLE_PRDR
3134 if (!sx.prdr_active)
3137 /* Update the journal. For homonymic addresses, use the base address plus
3138 the transport name. See lots of comments in deliver.c about the reasons
3139 for the complications when homonyms are involved. Just carry on after
3140 write error, as it may prove possible to update the spool file later. */
3142 if (testflag(addr, af_homonym))
3143 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3145 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3147 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3148 len = Ustrlen(CS sx.buffer);
3149 if (write(journal_fd, sx.buffer, len) != len)
3150 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3151 "%s: %s", sx.buffer, strerror(errno));
3155 #ifndef DISABLE_PRDR
3158 /* PRDR - get the final, overall response. For any non-success
3159 upgrade all the address statuses. */
3160 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3161 sx.ob->final_timeout);
3164 if(errno == 0 && sx.buffer[0] == '4')
3166 errno = ERRNO_DATA4XX;
3167 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3169 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3170 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3171 addr->transport_return = PENDING_OK; /* allow set_errno action */
3172 goto RESPONSE_FAILED;
3175 /* Update the journal, or setup retry. */
3176 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3177 if (addr->transport_return == OK)
3179 if (testflag(addr, af_homonym))
3180 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3182 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3184 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3185 len = Ustrlen(CS sx.buffer);
3186 if (write(journal_fd, sx.buffer, len) != len)
3187 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3188 "%s: %s", sx.buffer, strerror(errno));
3190 else if (addr->transport_return == DEFER)
3191 retry_add_item(addr, addr->address_retry_key, -2);
3195 /* Ensure the journal file is pushed out to disk. */
3197 if (EXIMfsync(journal_fd) < 0)
3198 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3204 /* Handle general (not specific to one address) failures here. The value of ok
3205 is used to skip over this code on the falling through case. A timeout causes a
3206 deferral. Other errors may defer or fail according to the response code, and
3207 may set up a special errno value, e.g. after connection chopped, which is
3208 assumed if errno == 0 and there is no text in the buffer. If control reaches
3209 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3210 the problem is not related to this specific message. */
3215 uschar * set_message;
3221 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3222 sx.buffer, &code, &message, &pass_message);
3230 message = string_sprintf("send() to %s [%s] failed: %s",
3231 host->name, host->address, message ? message : US strerror(save_errno));
3232 sx.send_quit = FALSE;
3240 sx.ok = FALSE; /* For when reached by GOTO */
3241 set_message = message;
3243 /* We want to handle timeouts after MAIL or "." and loss of connection after
3244 "." specially. They can indicate a problem with the sender address or with
3245 the contents of the message rather than a real error on the connection. These
3246 cases are treated in the same way as a 4xx response. This next bit of code
3247 does the classification. */
3254 message_error = TRUE;
3258 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3259 Ustrncmp(smtp_command,"end ",4) == 0;
3262 case ERRNO_SMTPCLOSED:
3263 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3267 message_error = FALSE;
3271 /* Handle the cases that are treated as message errors. These are:
3273 (a) negative response or timeout after MAIL
3274 (b) negative response after DATA
3275 (c) negative response or timeout or dropped connection after "."
3276 (d) utf8 support required and not offered
3278 It won't be a negative response or timeout after RCPT, as that is dealt
3279 with separately above. The action in all cases is to set an appropriate
3280 error code for all the addresses, but to leave yield set to OK because the
3281 host itself has not failed. Of course, it might in practice have failed
3282 when we've had a timeout, but if so, we'll discover that at the next
3283 delivery attempt. For a temporary error, set the message_defer flag, and
3284 write to the logs for information if this is not the last host. The error
3285 for the last host will be logged as part of the address's log line. */
3289 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3291 /* If there's an errno, the message contains just the identity of
3296 else /* Anything other than 5 is treated as temporary */
3300 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3301 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3302 msglog_line(host, message);
3303 *message_defer = TRUE;
3307 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3308 ".", or some other transportation error. We defer all addresses and yield
3309 DEFER, except for the case of failed add_headers expansion, or a transport
3310 filter failure, when the yield should be ERROR, to stop it trying other
3316 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3317 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3321 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3322 #ifdef EXPERIMENTAL_DSN_INFO
3323 , sx.smtp_greeting, sx.helo_response
3329 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3330 SMTP session tidily. However, if there were too many addresses to send in one
3331 message (indicated by first_addr being non-NULL) we want to carry on with the
3332 rest of them. Also, it is desirable to send more than one message down the SMTP
3333 connection if there are several waiting, provided we haven't already sent so
3334 many as to hit the configured limit. The function transport_check_waiting looks
3335 for a waiting message and returns its id. Then transport_pass_socket tries to
3336 set up a continued delivery by passing the socket on to another process. The
3337 variable send_rset is FALSE if a message has just been successfully transfered.
3339 If we are already sending down a continued channel, there may be further
3340 addresses not yet delivered that are aimed at the same host, but which have not
3341 been passed in this run of the transport. In this case, continue_more will be
3342 true, and all we should do is send RSET if necessary, and return, leaving the
3345 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3346 do not want to continue with other messages down the same channel, because that
3347 can lead to looping between two or more messages, all with the same,
3348 temporarily failing address(es). [The retry information isn't updated yet, so
3349 new processes keep on trying.] We probably also don't want to try more of this
3350 message's addresses either.
3352 If we have started a TLS session, we have to end it before passing the
3353 connection to a new process. However, not all servers can handle this (Exim
3354 can), so we do not pass such a connection on if the host matches
3355 hosts_nopass_tls. */
3358 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3359 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3360 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3362 if (sx.completed_addr && sx.ok && sx.send_quit)
3365 smtp_compare_t t_compare;
3367 t_compare.tblock = tblock;
3368 t_compare.current_sender_address = sender_address;
3370 if ( sx.first_addr != NULL
3374 ( tls_out.active < 0 && !continue_proxy_cipher
3375 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3379 transport_check_waiting(tblock->name, host->name,
3380 tblock->connection_max_messages, new_message_id, &more,
3381 (oicf)smtp_are_same_identities, (void*)&t_compare)
3388 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3390 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3391 host->address, strerror(errno));
3392 sx.send_quit = FALSE;
3394 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3395 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3398 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3402 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3403 host->name, host->address, msg);
3407 /* Either RSET was not needed, or it succeeded */
3412 int socket_fd = sx.inblock.sock;
3415 if (sx.first_addr != NULL) /* More addresses still to be sent */
3416 { /* in this run of the transport */
3417 continue_sequence++; /* Causes * in logging */
3421 /* Unless caller said it already has more messages listed for this host,
3422 pass the connection on to a new Exim process (below, the call to
3423 transport_pass_socket). If the caller has more ready, just return with
3424 the connection still open. */
3427 if (tls_out.active >= 0)
3429 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3431 /* Before passing the socket on, or returning to caller with it still
3432 open, we must shut down TLS. Not all MTAs allow for the continuation
3433 of the SMTP session when TLS is shut down. We test for this by sending
3434 a new EHLO. If we don't get a good response, we don't attempt to pass
3437 tls_close(FALSE, TRUE);
3438 smtp_peer_options = smtp_peer_options_wrap;
3440 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3441 "EHLO %s\r\n", sx.helo_data) >= 0
3442 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3443 '2', sx.ob->command_timeout);
3445 if (sx.ok && continue_more)
3446 return yield; /* More addresses for another run */
3450 /* Set up a pipe for proxying TLS for the new transport process */
3452 smtp_peer_options |= OPTION_TLS;
3453 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3456 set_errno(sx.first_addr, errno, US"internal allocation problem",
3458 # ifdef EXPERIMENTAL_DSN_INFO
3459 , sx.smtp_greeting, sx.helo_response
3466 return yield; /* More addresses for another run */
3468 /* If the socket is successfully passed, we mustn't send QUIT (or
3469 indeed anything!) from here. */
3471 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3472 propagate it from the initial
3474 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3475 host->address, new_message_id, socket_fd))
3477 sx.send_quit = FALSE;
3479 /* If TLS is still active, we need to proxy it for the transport we
3480 just passed the baton to. Fork a child to to do it, and return to
3481 get logging done asap. Which way to place the work makes assumptions
3482 about post-fork prioritisation which may not hold on all platforms. */
3484 if (tls_out.active >= 0)
3487 if (pid > 0) /* parent */
3489 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3491 waitpid(pid, NULL, 0);
3492 tls_close(FALSE, FALSE);
3493 (void)close(sx.inblock.sock);
3494 continue_transport = NULL;
3495 continue_hostname = NULL;
3498 else if (pid == 0) /* child; fork again to disconnect totally */
3503 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3504 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3506 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3514 /* If RSET failed and there are addresses left, they get deferred. */
3516 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3517 #ifdef EXPERIMENTAL_DSN_INFO
3518 , sx.smtp_greeting, sx.helo_response
3524 /* End off tidily with QUIT unless the connection has died or the socket has
3525 been passed to another process. There has been discussion on the net about what
3526 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3527 to wait for a response, but on the other hand, there isn't anything one can do
3528 with an error response, other than log it. Exim used to do that. However,
3529 further discussion suggested that it is positively advantageous not to wait for
3530 the response, but to close the session immediately. This is supposed to move
3531 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3532 load from the server. (Hosts that are both servers and clients may not see much
3533 difference, of course.) Further discussion indicated that this was safe to do
3534 on Unix systems which have decent implementations of TCP/IP that leave the
3535 connection around for a while (TIME_WAIT) after the application has gone away.
3536 This enables the response sent by the server to be properly ACKed rather than
3537 timed out, as can happen on broken TCP/IP implementations on other OS.
3539 This change is being made on 31-Jul-98. After over a year of trouble-free
3540 operation, the old commented-out code was removed on 17-Sep-99. */
3543 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3548 tls_close(FALSE, TRUE);
3551 /* Close the socket, and return the appropriate value, first setting
3552 works because the NULL setting is passed back to the calling process, and
3553 remote_max_parallel is forced to 1 when delivering over an existing connection,
3555 If all went well and continue_more is set, we shouldn't actually get here if
3556 there are further addresses, as the return above will be taken. However,
3557 writing RSET might have failed, or there may be other addresses whose hosts are
3558 specified in the transports, and therefore not visible at top level, in which
3559 case continue_more won't get set. */
3561 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3564 shutdown(sx.outblock.sock, SHUT_WR);
3565 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3566 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3567 rc--; /* drain socket */
3569 (void)close(sx.inblock.sock);
3571 #ifndef DISABLE_EVENT
3572 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3575 continue_transport = NULL;
3576 continue_hostname = NULL;
3583 /*************************************************
3584 * Closedown entry point *
3585 *************************************************/
3587 /* This function is called when exim is passed an open smtp channel
3588 from another incarnation, but the message which it has been asked
3589 to deliver no longer exists. The channel is on stdin.
3591 We might do fancy things like looking for another message to send down
3592 the channel, but if the one we sought has gone, it has probably been
3593 delivered by some other process that itself will seek further messages,
3594 so just close down our connection.
3596 Argument: pointer to the transport instance block
3601 smtp_transport_closedown(transport_instance *tblock)
3603 smtp_transport_options_block *ob =
3604 (smtp_transport_options_block *)tblock->options_block;
3605 smtp_inblock inblock;
3606 smtp_outblock outblock;
3608 uschar inbuffer[4096];
3609 uschar outbuffer[16];
3611 inblock.sock = fileno(stdin);
3612 inblock.buffer = inbuffer;
3613 inblock.buffersize = sizeof(inbuffer);
3614 inblock.ptr = inbuffer;
3615 inblock.ptrend = inbuffer;
3617 outblock.sock = inblock.sock;
3618 outblock.buffersize = sizeof(outbuffer);
3619 outblock.buffer = outbuffer;
3620 outblock.ptr = outbuffer;
3621 outblock.cmd_count = 0;
3622 outblock.authenticating = FALSE;
3624 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3625 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3626 ob->command_timeout);
3627 (void)close(inblock.sock);
3632 /*************************************************
3633 * Prepare addresses for delivery *
3634 *************************************************/
3636 /* This function is called to flush out error settings from previous delivery
3637 attempts to other hosts. It also records whether we got here via an MX record
3638 or not in the more_errno field of the address. We are interested only in
3639 addresses that are still marked DEFER - others may have got delivered to a
3640 previously considered IP address. Set their status to PENDING_DEFER to indicate
3641 which ones are relevant this time.
3644 addrlist the list of addresses
3645 host the host we are delivering to
3647 Returns: the first address for this delivery
3650 static address_item *
3651 prepare_addresses(address_item *addrlist, host_item *host)
3653 address_item *first_addr = NULL;
3655 for (addr = addrlist; addr; addr = addr->next)
3656 if (addr->transport_return == DEFER)
3658 if (!first_addr) first_addr = addr;
3659 addr->transport_return = PENDING_DEFER;
3660 addr->basic_errno = 0;
3661 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3662 addr->message = NULL;
3664 addr->cipher = NULL;
3665 addr->ourcert = NULL;
3666 addr->peercert = NULL;
3667 addr->peerdn = NULL;
3668 addr->ocsp = OCSP_NOT_REQ;
3670 #ifdef EXPERIMENTAL_DSN_INFO
3671 addr->smtp_greeting = NULL;
3672 addr->helo_response = NULL;
3680 /*************************************************
3681 * Main entry point *
3682 *************************************************/
3684 /* See local README for interface details. As this is a remote transport, it is
3685 given a chain of addresses to be delivered in one connection, if possible. It
3686 always returns TRUE, indicating that each address has its own independent
3687 status set, except if there is a setting up problem, in which case it returns
3691 smtp_transport_entry(
3692 transport_instance *tblock, /* data for this instantiation */
3693 address_item *addrlist) /* addresses we are working on */
3697 int hosts_defer = 0;
3699 int hosts_looked_up = 0;
3700 int hosts_retry = 0;
3701 int hosts_serial = 0;
3702 int hosts_total = 0;
3703 int total_hosts_tried = 0;
3705 BOOL expired = TRUE;
3706 uschar *expanded_hosts = NULL;
3708 uschar *tid = string_sprintf("%s transport", tblock->name);
3709 smtp_transport_options_block *ob =
3710 (smtp_transport_options_block *)(tblock->options_block);
3711 host_item *hostlist = addrlist->host_list;
3712 host_item *host = NULL;
3716 debug_printf("%s transport entered\n", tblock->name);
3717 for (addr = addrlist; addr; addr = addr->next)
3718 debug_printf(" %s\n", addr->address);
3721 debug_printf("hostlist:\n");
3722 for (host = hostlist; host; host = host->next)
3723 debug_printf(" %s:%d\n", host->name, host->port);
3725 if (continue_hostname)
3726 debug_printf("already connected to %s [%s] (on fd %d)\n",
3727 continue_hostname, continue_host_address,
3728 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3731 /* Set the flag requesting that these hosts be added to the waiting
3732 database if the delivery fails temporarily or if we are running with
3733 queue_smtp or a 2-stage queue run. This gets unset for certain
3734 kinds of error, typically those that are specific to the message. */
3736 update_waiting = TRUE;
3738 /* If a host list is not defined for the addresses - they must all have the
3739 same one in order to be passed to a single transport - or if the transport has
3740 a host list with hosts_override set, use the host list supplied with the
3741 transport. It is an error for this not to exist. */
3743 if (!hostlist || (ob->hosts_override && ob->hosts))
3747 addrlist->message = string_sprintf("%s transport called with no hosts set",
3749 addrlist->transport_return = PANIC;
3750 return FALSE; /* Only top address has status */
3753 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3756 /* If the transport's host list contains no '$' characters, and we are not
3757 randomizing, it is fixed and therefore a chain of hosts can be built once
3758 and for all, and remembered for subsequent use by other calls to this
3759 transport. If, on the other hand, the host list does contain '$', or we are
3760 randomizing its order, we have to rebuild it each time. In the fixed case,
3761 as the hosts string will never be used again, it doesn't matter that we
3762 replace all the : characters with zeros. */
3766 uschar *s = ob->hosts;
3768 if (Ustrchr(s, '$') != NULL)
3770 if (!(expanded_hosts = expand_string(s)))
3772 addrlist->message = string_sprintf("failed to expand list of hosts "
3773 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3774 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3775 return FALSE; /* Only top address has status */
3777 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3778 "\"%s\"\n", s, expanded_hosts);
3782 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3784 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3786 /* Check that the expansion yielded something useful. */
3790 string_sprintf("%s transport has empty hosts setting", tblock->name);
3791 addrlist->transport_return = PANIC;
3792 return FALSE; /* Only top address has status */
3795 /* If there was no expansion of hosts, save the host list for
3798 if (!expanded_hosts) ob->hostlist = hostlist;
3801 /* This is not the first time this transport has been run in this delivery;
3802 the host list was built previously. */
3805 hostlist = ob->hostlist;
3808 /* The host list was supplied with the address. If hosts_randomize is set, we
3809 must sort it into a random order if it did not come from MX records and has not
3810 already been randomized (but don't bother if continuing down an existing
3813 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3815 host_item *newlist = NULL;
3818 host_item *h = hostlist;
3819 hostlist = hostlist->next;
3821 h->sort_key = random_number(100);
3828 else if (h->sort_key < newlist->sort_key)
3835 host_item *hh = newlist;
3838 if (h->sort_key < hh->next->sort_key) break;
3846 hostlist = addrlist->host_list = newlist;
3849 /* Sort out the default port. */
3851 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3853 /* For each host-plus-IP-address on the list:
3855 . If this is a continued delivery and the host isn't the one with the
3856 current connection, skip.
3858 . If the status is unusable (i.e. previously failed or retry checked), skip.
3860 . If no IP address set, get the address, either by turning the name into
3861 an address, calling gethostbyname if gethostbyname is on, or by calling
3862 the DNS. The DNS may yield multiple addresses, in which case insert the
3863 extra ones into the list.
3865 . Get the retry data if not previously obtained for this address and set the
3866 field which remembers the state of this address. Skip if the retry time is
3867 not reached. If not, remember whether retry data was found. The retry string
3868 contains both the name and the IP address.
3870 . Scan the list of addresses and mark those whose status is DEFER as
3871 PENDING_DEFER. These are the only ones that will be processed in this cycle
3874 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3875 Some addresses may be successfully delivered, others may fail, and yet
3876 others may get temporary errors and so get marked DEFER.
3878 . The return from the delivery attempt is OK if a connection was made and a
3879 valid SMTP dialogue was completed. Otherwise it is DEFER.
3881 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3883 . If fail to connect, or other defer state, add a retry item.
3885 . If there are any addresses whose status is still DEFER, carry on to the
3886 next host/IPaddress, unless we have tried the number of hosts given
3887 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3888 there is some fancy logic for hosts_max_try that means its limit can be
3889 overstepped in some circumstances.
3891 If we get to the end of the list, all hosts have deferred at least one address,
3892 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3893 delivery attempt to those hosts whose last try was before the arrival time of
3894 the current message. To cope with this, we have to go round the loop a second
3895 time. After that, set the status and error data for any addresses that haven't
3896 had it set already. */
3898 for (cutoff_retry = 0;
3899 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3902 host_item *nexthost = NULL;
3903 int unexpired_hosts_tried = 0;
3905 for (host = hostlist;
3907 && unexpired_hosts_tried < ob->hosts_max_try
3908 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3914 BOOL host_is_expired = FALSE;
3915 BOOL message_defer = FALSE;
3916 BOOL some_deferred = FALSE;
3917 address_item *first_addr = NULL;
3918 uschar *interface = NULL;
3919 uschar *retry_host_key = NULL;
3920 uschar *retry_message_key = NULL;
3921 uschar *serialize_key = NULL;
3923 /* Default next host is next host. :-) But this can vary if the
3924 hosts_max_try limit is hit (see below). It may also be reset if a host
3925 address is looked up here (in case the host was multihomed). */
3927 nexthost = host->next;
3929 /* If the address hasn't yet been obtained from the host name, look it up
3930 now, unless the host is already marked as unusable. If it is marked as
3931 unusable, it means that the router was unable to find its IP address (in
3932 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3933 the lookup failed last time. We don't get this far if *all* MX records
3934 point to non-existent hosts; that is treated as a hard error.
3936 We can just skip this host entirely. When the hosts came from the router,
3937 the address will timeout based on the other host(s); when the address is
3938 looked up below, there is an explicit retry record added.
3940 Note that we mustn't skip unusable hosts if the address is not unset; they
3941 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3945 int new_port, flags;
3948 if (host->status >= hstatus_unusable)
3950 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3955 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3957 /* The host name is permitted to have an attached port. Find it, and
3958 strip it from the name. Just remember it for now. */
3960 new_port = host_item_get_port(host);
3962 /* Count hosts looked up */
3966 /* Find by name if so configured, or if it's an IP address. We don't
3967 just copy the IP address, because we need the test-for-local to happen. */
3969 flags = HOST_FIND_BY_A;
3970 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3971 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3973 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3974 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3976 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3977 &ob->dnssec, /* domains for request/require */
3980 /* Update the host (and any additional blocks, resulting from
3981 multihoming) with a host-specific port, if any. */
3983 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3985 /* Failure to find the host at this time (usually DNS temporary failure)
3986 is really a kind of routing failure rather than a transport failure.
3987 Therefore we add a retry item of the routing kind, not to stop us trying
3988 to look this name up here again, but to ensure the address gets timed
3989 out if the failures go on long enough. A complete failure at this point
3990 commonly points to a configuration error, but the best action is still
3991 to carry on for the next host. */
3993 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3995 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3997 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3998 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3999 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4000 host->status = hstatus_unusable;
4002 for (addr = addrlist; addr; addr = addr->next)
4004 if (addr->transport_return != DEFER) continue;
4005 addr->basic_errno = ERRNO_UNKNOWNHOST;
4006 addr->message = string_sprintf(
4007 rc == HOST_FIND_SECURITY
4008 ? "lookup of IP address for %s was insecure"
4009 : "failed to lookup IP address for %s",
4015 /* If the host is actually the local host, we may have a problem, or
4016 there may be some cunning configuration going on. In the problem case,
4017 log things and give up. The default transport status is already DEFER. */
4019 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4021 for (addr = addrlist; addr; addr = addr->next)
4023 addr->basic_errno = 0;
4024 addr->message = string_sprintf("%s transport found host %s to be "
4025 "local", tblock->name, host->name);
4029 } /* End of block for IP address lookup */
4031 /* If this is a continued delivery, we are interested only in the host
4032 which matches the name of the existing open channel. The check is put
4033 here after the local host lookup, in case the name gets expanded as a
4034 result of the lookup. Set expired FALSE, to save the outer loop executing
4037 if ( continue_hostname
4038 && ( Ustrcmp(continue_hostname, host->name) != 0
4039 || Ustrcmp(continue_host_address, host->address) != 0
4043 continue; /* With next host */
4046 /* Reset the default next host in case a multihomed host whose addresses
4047 are not looked up till just above added to the host list. */
4049 nexthost = host->next;
4051 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4052 domain is in queue_smtp_domains, we don't actually want to attempt any
4053 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4054 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4055 were not in it. We don't want to hold up all SMTP deliveries! Except when
4056 doing a two-stage queue run, don't do this if forcing. */
4058 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4059 match_isinlist(addrlist->domain,
4060 (const uschar **)&queue_smtp_domains, 0,
4061 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4064 for (addr = addrlist; addr; addr = addr->next)
4065 if (addr->transport_return == DEFER)
4066 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4067 continue; /* With next host */
4070 /* Count hosts being considered - purely for an intelligent comment
4071 if none are usable. */
4075 /* Set $host and $host address now in case they are needed for the
4076 interface expansion or the serialize_hosts check; they remain set if an
4077 actual delivery happens. */
4079 deliver_host = host->name;
4080 deliver_host_address = host->address;
4081 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4082 : host->dnssec == DS_NO ? US"no"
4085 /* Set up a string for adding to the retry key if the port number is not
4086 the standard SMTP port. A host may have its own port setting that overrides
4089 pistring = string_sprintf(":%d", host->port == PORT_NONE
4090 ? defport : host->port);
4091 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4093 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4094 string is set, even if constant (as different transports can have different
4095 constant settings), we must add it to the key that is used for retries,
4096 because connections to the same host from a different interface should be
4097 treated separately. */
4099 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4100 if ((rs = ob->interface) && *rs)
4102 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4104 pistring = string_sprintf("%s/%s", pistring, interface);
4107 /* The first time round the outer loop, check the status of the host by
4108 inspecting the retry data. The second time round, we are interested only
4109 in expired hosts that haven't been tried since this message arrived. */
4111 if (cutoff_retry == 0)
4114 /* Ensure the status of the address is set by checking retry data if
4115 necessary. There may be host-specific retry data (applicable to all
4116 messages) and also data for retries of a specific message at this host.
4117 If either of these retry records are actually read, the keys used are
4118 returned to save recomputing them later. */
4120 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4121 US"retry_include_ip_address", ob->retry_include_ip_address,
4122 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4123 continue; /* with next host */
4125 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4126 incl_ip, &retry_host_key, &retry_message_key);
4128 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4129 (host->address == NULL)? US"" : host->address, pistring,
4130 (host->status == hstatus_usable)? "usable" :
4131 (host->status == hstatus_unusable)? "unusable" :
4132 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4134 /* Skip this address if not usable at this time, noting if it wasn't
4135 actually expired, both locally and in the address. */
4137 switch (host->status)
4139 case hstatus_unusable:
4141 setflag(addrlist, af_retry_skipped);
4144 case hstatus_unusable_expired:
4147 case hwhy_retry: hosts_retry++; break;
4148 case hwhy_failed: hosts_fail++; break;
4150 case hwhy_deferred: hosts_defer++; break;
4153 /* If there was a retry message key, implying that previously there
4154 was a message-specific defer, we don't want to update the list of
4155 messages waiting for these hosts. */
4157 if (retry_message_key) update_waiting = FALSE;
4158 continue; /* With the next host or IP address */
4162 /* Second time round the loop: if the address is set but expired, and
4163 the message is newer than the last try, let it through. */
4168 || host->status != hstatus_unusable_expired
4169 || host->last_try > received_time.tv_sec)
4171 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4172 host->name, host->address, pistring);
4173 host_is_expired = TRUE;
4176 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4177 it remains TRUE only if all hosts are expired and none are actually tried.
4182 /* If this host is listed as one to which access must be serialized,
4183 see if another Exim process has a connection to it, and if so, skip
4184 this host. If not, update the database to record our connection to it
4185 and remember this for later deletion. Do not do any of this if we are
4186 sending the message down a pre-existing connection. */
4188 if ( !continue_hostname
4189 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4191 serialize_key = string_sprintf("host-serialize-%s", host->name);
4192 if (!enq_start(serialize_key, 1))
4195 debug_printf("skipping host %s because another Exim process "
4196 "is connected to it\n", host->name);
4202 /* OK, we have an IP address that is not waiting for its retry time to
4203 arrive (it might be expired) OR (second time round the loop) we have an
4204 expired host that hasn't been tried since the message arrived. Have a go
4205 at delivering the message to it. First prepare the addresses by flushing
4206 out the result of previous attempts, and finding the first address that
4207 is still to be delivered. */
4209 first_addr = prepare_addresses(addrlist, host);
4211 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4212 message_id, host->name, host->address, addrlist->address,
4213 addrlist->next ? ", ..." : "");
4215 set_process_info("delivering %s to %s [%s] (%s%s)",
4216 message_id, host->name, host->address, addrlist->address,
4217 addrlist->next ? ", ..." : "");
4219 /* This is not for real; don't do the delivery. If there are
4220 any remaining hosts, list them. */
4225 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4226 for (addr = addrlist; addr; addr = addr->next)
4228 addr->host_used = host;
4229 addr->special_action = '*';
4230 addr->message = US"delivery bypassed by -N option";
4234 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4235 "*** host and remaining hosts:\n", tblock->name);
4236 for (host2 = host; host2; host2 = host2->next)
4237 debug_printf(" %s [%s]\n", host2->name,
4238 host2->address ? host2->address : US"unset");
4243 /* This is for real. If the host is expired, we don't count it for
4244 hosts_max_retry. This ensures that all hosts must expire before an address
4245 is timed out, unless hosts_max_try_hardlimit (which protects against
4246 lunatic DNS configurations) is reached.
4248 If the host is not expired and we are about to hit the hosts_max_retry
4249 limit, check to see if there is a subsequent hosts with a different MX
4250 value. If so, make that the next host, and don't count this one. This is a
4251 heuristic to make sure that different MXs do get tried. With a normal kind
4252 of retry rule, they would get tried anyway when the earlier hosts were
4253 delayed, but if the domain has a "retry every time" type of rule - as is
4254 often used for the the very large ISPs, that won't happen. */
4259 /* Make a copy of the host if it is local to this invocation
4260 of the transport. */
4264 thost = store_get(sizeof(host_item));
4266 thost->name = string_copy(host->name);
4267 thost->address = string_copy(host->address);
4272 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4276 debug_printf("hosts_max_try limit reached with this host\n");
4277 for (h = host; h; h = h->next) if (h->mx != host->mx)
4280 unexpired_hosts_tried--;
4281 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4282 "and will be tried\n");
4287 /* Attempt the delivery. */
4289 total_hosts_tried++;
4290 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4291 &message_defer, FALSE);
4294 OK => connection made, each address contains its result;
4295 message_defer is set for message-specific defers (when all
4296 recipients are marked defer)
4297 DEFER => there was a non-message-specific delivery problem;
4298 ERROR => there was a problem setting up the arguments for a filter,
4299 or there was a problem with expanding added headers
4302 /* If the result is not OK, there was a non-message-specific problem.
4303 If the result is DEFER, we need to write to the logs saying what happened
4304 for this particular host, except in the case of authentication and TLS
4305 failures, where the log has already been written. If all hosts defer a
4306 general message is written at the end. */
4308 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4309 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4310 write_logs(first_addr, host);
4312 #ifndef DISABLE_EVENT
4314 deferred_event_raise(first_addr, host);
4317 /* If STARTTLS was accepted, but there was a failure in setting up the
4318 TLS session (usually a certificate screwup), and the host is not in
4319 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4320 TLS forcibly turned off. We have to start from scratch with a new SMTP
4321 connection. That's why the retry is done from here, not from within
4322 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4323 session, so the in-clear transmission after those errors, if permitted,
4324 happens inside smtp_deliver().] */
4328 && first_addr->basic_errno == ERRNO_TLSFAILURE
4329 && ob->tls_tempfail_tryclear
4330 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4333 log_write(0, LOG_MAIN,
4334 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4335 first_addr->message, host->name, host->address);
4336 first_addr = prepare_addresses(addrlist, host);
4337 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4338 &message_defer, TRUE);
4339 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4340 write_logs(first_addr, host);
4341 # ifndef DISABLE_EVENT
4343 deferred_event_raise(first_addr, host);
4346 #endif /*SUPPORT_TLS*/
4349 /* Delivery attempt finished */
4351 rs = rc == OK ? US"OK"
4352 : rc == DEFER ? US"DEFER"
4353 : rc == ERROR ? US"ERROR"
4356 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4357 message_id, host->name, host->address, addrlist->address,
4358 addrlist->next ? " (& others)" : "", rs);
4360 /* Release serialization if set up */
4362 if (serialize_key) enq_end(serialize_key);
4364 /* If the result is DEFER, or if a host retry record is known to exist, we
4365 need to add an item to the retry chain for updating the retry database
4366 at the end of delivery. We only need to add the item to the top address,
4367 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4368 for any other delivery attempts using the same address. (It is copied into
4369 the unusable tree at the outer level, so even if different address blocks
4370 contain the same address, it still won't get tried again.) */
4372 if (rc == DEFER || retry_host_key)
4374 int delete_flag = rc != DEFER ? rf_delete : 0;
4375 if (!retry_host_key)
4378 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4379 US"retry_include_ip_address", ob->retry_include_ip_address,
4380 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4381 incl_ip = TRUE; /* error; use most-specific retry record */
4383 retry_host_key = incl_ip
4384 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4385 : string_sprintf("T:%S%s", host->name, pistring);
4388 /* If a delivery of another message over an existing SMTP connection
4389 yields DEFER, we do NOT set up retry data for the host. This covers the
4390 case when there are delays in routing the addresses in the second message
4391 that are so long that the server times out. This is alleviated by not
4392 routing addresses that previously had routing defers when handling an
4393 existing connection, but even so, this case may occur (e.g. if a
4394 previously happily routed address starts giving routing defers). If the
4395 host is genuinely down, another non-continued message delivery will
4396 notice it soon enough. */
4398 if (delete_flag != 0 || !continue_hostname)
4399 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4401 /* We may have tried an expired host, if its retry time has come; ensure
4402 the status reflects the expiry for the benefit of any other addresses. */
4406 host->status = host_is_expired
4407 ? hstatus_unusable_expired : hstatus_unusable;
4408 host->why = hwhy_deferred;
4412 /* If message_defer is set (host was OK, but every recipient got deferred
4413 because of some message-specific problem), or if that had happened
4414 previously so that a message retry key exists, add an appropriate item
4415 to the retry chain. Note that if there was a message defer but now there is
4416 a host defer, the message defer record gets deleted. That seems perfectly
4417 reasonable. Also, stop the message from being remembered as waiting
4418 for specific hosts. */
4420 if (message_defer || retry_message_key)
4422 int delete_flag = message_defer ? 0 : rf_delete;
4423 if (!retry_message_key)
4426 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4427 US"retry_include_ip_address", ob->retry_include_ip_address,
4428 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4429 incl_ip = TRUE; /* error; use most-specific retry record */
4431 retry_message_key = incl_ip
4432 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4434 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4436 retry_add_item(addrlist, retry_message_key,
4437 rf_message | rf_host | delete_flag);
4438 update_waiting = FALSE;
4441 /* Any return other than DEFER (that is, OK or ERROR) means that the
4442 addresses have got their final statuses filled in for this host. In the OK
4443 case, see if any of them are deferred. */
4446 for (addr = addrlist; addr; addr = addr->next)
4447 if (addr->transport_return == DEFER)
4449 some_deferred = TRUE;
4453 /* If no addresses deferred or the result was ERROR, return. We do this for
4454 ERROR because a failing filter set-up or add_headers expansion is likely to
4455 fail for any host we try. */
4457 if (rc == ERROR || (rc == OK && !some_deferred))
4459 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4460 return TRUE; /* Each address has its status */
4463 /* If the result was DEFER or some individual addresses deferred, let
4464 the loop run to try other hosts with the deferred addresses, except for the
4465 case when we were trying to deliver down an existing channel and failed.
4466 Don't try any other hosts in this case. */
4468 if (continue_hostname) break;
4470 /* If the whole delivery, or some individual addresses, were deferred and
4471 there are more hosts that could be tried, do not count this host towards
4472 the hosts_max_try limit if the age of the message is greater than the
4473 maximum retry time for this host. This means we may try try all hosts,
4474 ignoring the limit, when messages have been around for some time. This is
4475 important because if we don't try all hosts, the address will never time
4476 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4478 if ((rc == DEFER || some_deferred) && nexthost)
4481 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4483 if (retry && retry->rules)
4485 retry_rule *last_rule;
4486 for (last_rule = retry->rules;
4488 last_rule = last_rule->next);
4489 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4491 else timedout = TRUE; /* No rule => timed out */
4495 unexpired_hosts_tried--;
4496 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4497 "hosts_max_try (message older than host's retry time)\n");
4500 } /* End of loop for trying multiple hosts. */
4502 /* This is the end of the loop that repeats iff expired is TRUE and
4503 ob->delay_after_cutoff is FALSE. The second time round we will
4504 try those hosts that haven't been tried since the message arrived. */
4508 debug_printf("all IP addresses skipped or deferred at least one address\n");
4509 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4510 debug_printf("retrying IP addresses not tried since message arrived\n");
4515 /* Get here if all IP addresses are skipped or defer at least one address. In
4516 MUA wrapper mode, this will happen only for connection or other non-message-
4517 specific failures. Force the delivery status for all addresses to FAIL. */
4521 for (addr = addrlist; addr; addr = addr->next)
4522 addr->transport_return = FAIL;
4526 /* In the normal, non-wrapper case, add a standard message to each deferred
4527 address if there hasn't been an error, that is, if it hasn't actually been
4528 tried this time. The variable "expired" will be FALSE if any deliveries were
4529 actually tried, or if there was at least one host that was not expired. That
4530 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4531 a delivery has been tried, an error code will be set, and the failing of the
4532 message is handled by the retry code later.
4534 If queue_smtp is set, or this transport was called to send a subsequent message
4535 down an existing TCP/IP connection, and something caused the host not to be
4536 found, we end up here, but can detect these cases and handle them specially. */
4538 for (addr = addrlist; addr; addr = addr->next)
4540 /* If host is not NULL, it means that we stopped processing the host list
4541 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4542 means we need to behave as if some hosts were skipped because their retry
4543 time had not come. Specifically, this prevents the address from timing out.
4544 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4545 hosts were tried. */
4548 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4551 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4552 "hosts were tried\n");
4557 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4558 setflag(addr, af_retry_skipped);
4561 if (queue_smtp) /* no deliveries attempted */
4563 addr->transport_return = DEFER;
4564 addr->basic_errno = 0;
4565 addr->message = US"SMTP delivery explicitly queued";
4568 else if ( addr->transport_return == DEFER
4569 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4573 addr->basic_errno = ERRNO_HRETRY;
4574 if (continue_hostname)
4575 addr->message = US"no host found for existing SMTP connection";
4578 setflag(addr, af_pass_message); /* This is not a security risk */
4579 addr->message = string_sprintf(
4580 "all hosts%s have been failing for a long time %s",
4581 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4582 ob->delay_after_cutoff
4583 ? US"(and retry time not reached)"
4584 : US"and were last tried after this message arrived");
4586 /* If we are already using fallback hosts, or there are no fallback hosts
4587 defined, convert the result to FAIL to cause a bounce. */
4589 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4590 addr->transport_return = FAIL;
4595 if (hosts_retry == hosts_total)
4596 s = "retry time not reached for any host%s";
4597 else if (hosts_fail == hosts_total)
4598 s = "all host address lookups%s failed permanently";
4599 else if (hosts_defer == hosts_total)
4600 s = "all host address lookups%s failed temporarily";
4601 else if (hosts_serial == hosts_total)
4602 s = "connection limit reached for all hosts%s";
4603 else if (hosts_fail+hosts_defer == hosts_total)
4604 s = "all host address lookups%s failed";
4606 s = "some host address lookups failed and retry time "
4607 "not reached for other hosts or connection limit reached%s";
4609 addr->message = string_sprintf(s,
4610 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4615 /* Update the database which keeps information about which messages are waiting
4616 for which hosts to become available. For some message-specific errors, the
4617 update_waiting flag is turned off because we don't want follow-on deliveries in
4618 those cases. If this transport instance is explicitly limited to one message
4619 per connection then follow-on deliveries are not possible and there's no need
4620 to create/update the per-transport wait-<transport_name> database. */
4622 if (update_waiting && tblock->connection_max_messages != 1)
4623 transport_update_waiting(hostlist, tblock->name);
4627 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4629 return TRUE; /* Each address has its status */
4632 #endif /*!MACRO_PREDEF*/
4635 /* End of transport/smtp.c */