1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
198 /* Default private options block for the smtp transport. */
200 smtp_transport_options_block smtp_transport_option_defaults = {
202 NULL, /* fallback_hosts */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
209 US"smtp", /* protocol */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
219 US"*", /* hosts_try_prdr */
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 US"*", /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 NULL, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
250 FALSE, /* lmtp_ignore_quota */
251 NULL, /* expand_retry_include_ip_address */
252 TRUE /* retry_include_ip_address */
253 #ifdef EXPERIMENTAL_SOCKS
255 ,NULL /* socks_proxy */
257 ,NULL, /* tls_certificate */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
265 US"system", /* tls_verify_certificates */
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
270 US"*", /* tls_try_verify_hosts */
271 US"*" /* tls_verify_cert_hostnames */
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
283 /* some DSN flags for use later */
285 static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
288 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
294 static uschar *smtp_command; /* Points to last cmd for error messages */
295 static uschar *mail_command; /* Points to MAIL cmd for error messages */
296 static BOOL update_waiting; /* TRUE to update the "wait" database */
299 /*************************************************
300 * Setup entry point *
301 *************************************************/
303 /* This function is called when the transport is about to be used,
304 but before running it in a sub-process. It is used for two things:
306 (1) To set the fallback host list in addresses, when delivering.
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
316 errmsg place for error message (not used)
318 Returns: OK always (FAIL, DEFER not used)
322 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
325 smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
328 errmsg = errmsg; /* Keep picky compilers happy */
332 /* Pass back options if required. This interface is getting very messy. */
336 tf->interface = ob->interface;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
345 tf->helo_data = ob->helo_data;
348 /* Set the fallback host list for all the addresses that don't have fallback
349 host lists, provided that the local host wasn't present in the original host
352 if (!testflag(addrlist, af_local_host_removed))
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
364 /*************************************************
365 * Initialization entry point *
366 *************************************************/
368 /* Called for each instance, after its options have been read, to
369 enable consistency checks to be done, or anything else that needs
372 Argument: pointer to the transport instance block
377 smtp_transport_init(transport_instance *tblock)
379 smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
382 /* Retry_use_local_part defaults FALSE if unset */
384 if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
387 /* Set the default port according to the protocol */
389 if (ob->port == NULL)
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
393 /* Set up the setup entry point, to be called before subprocesses for this
396 tblock->setup = smtp_transport_setup;
398 /* Complain if any of the timeouts are zero. */
400 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
406 /* If hosts_override is set and there are local hosts, set the global
407 flag that stops verify from showing router hosts. */
409 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
411 /* If there are any fallback hosts listed, build a chain of host items
412 for them, but do not do any lookups at this time. */
414 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
417 if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
430 /*************************************************
431 * Set delivery info into all active addresses *
432 *************************************************/
434 /* Only addresses whose status is >= PENDING are relevant. A lesser
435 status means that an address is not currently being processed.
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
443 host if set, mark addrs as having used this host
445 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447 this particular type of timeout.
453 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
454 BOOL pass_message, host_item * host)
458 if (errno_value == ERRNO_CONNECTTIMEOUT)
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
463 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return >= PENDING)
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
471 if (pass_message) setflag(addr, af_pass_message);
473 addr->transport_return = rc;
475 addr->host_used = host;
481 /*************************************************
482 * Check an SMTP response *
483 *************************************************/
485 /* This function is given an errno code and the SMTP response buffer
486 to analyse, together with the host identification for generating messages. It
487 sets an appropriate message and puts the first digit of the response code into
488 the yield variable. If no response was actually read, a suitable digit is
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
500 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
504 check_response(host_item *host, int *errno_value, int more_errno,
505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
509 if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
515 *yield = '4'; /* Default setting is to give a temporary error */
517 /* Handle response timeout */
519 if (*errno_value == ETIMEDOUT)
521 *message = US string_sprintf("SMTP timeout after %s%s",
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
529 /* Handle malformed SMTP response */
531 if (*errno_value == ERRNO_SMTPFORMAT)
533 const uschar *malfresp = string_printing(buffer);
534 while (isspace(*malfresp)) malfresp++;
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
543 /* Handle a failed filter process error; can't send QUIT as we mustn't
546 if (*errno_value == ERRNO_FILTER_FAIL)
548 *message = US string_sprintf("transport filter process failed (%d)%s",
550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
554 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
557 if (*errno_value == ERRNO_CHHEADER_FAIL)
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
565 /* Handle failure to write a complete data block */
567 if (*errno_value == ERRNO_WRITEINCOMPLETE)
569 *message = US string_sprintf("failed to write a data block");
573 /* Handle error responses from the remote mailer. */
577 const uschar *s = string_printing(buffer);
578 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
579 "%s", pl, smtp_command, s);
580 *pass_message = TRUE;
585 /* No data was read. If there is no errno, this must be the EOF (i.e.
586 connection closed) case, which causes deferral. An explicit connection reset
587 error has the same effect. Otherwise, put the host's identity in the message,
588 leaving the errno value to be interpreted as well. In all cases, we have to
589 assume the connection is now dead. */
591 if (*errno_value == 0 || *errno_value == ECONNRESET)
593 *errno_value = ERRNO_SMTPCLOSED;
594 *message = US string_sprintf("Remote host closed connection "
595 "in response to %s%s", pl, smtp_command);
597 else *message = US string_sprintf("%s [%s]", host->name, host->address);
604 /*************************************************
605 * Write error message to logs *
606 *************************************************/
608 /* This writes to the main log and to the message log.
611 addr the address item containing error information
612 host the current host
618 write_logs(address_item *addr, host_item *host)
620 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
632 if (log_extra_selector & LX_outgoing_port)
633 message = string_sprintf("%s:%d", message,
634 host->port == PORT_NONE ? 25 : host->port);
635 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
636 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
637 strerror(addr->basic_errno));
642 msglog_line(host_item * host, uschar * message)
644 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
645 host->name, host->address, message);
650 #ifdef EXPERIMENTAL_EVENT
651 /*************************************************
652 * Post-defer action *
653 *************************************************/
655 /* This expands an arbitrary per-transport string.
656 It might, for example, be used to write to the database log.
659 addr the address item containing error information
660 host the current host
666 deferred_event_raise(address_item *addr, host_item *host)
668 uschar * action = addr->transport->event_action;
669 const uschar * save_domain;
675 save_domain = deliver_domain;
676 save_local = deliver_localpart;
678 /*XXX would ip & port already be set up? */
679 deliver_host_address = string_copy(host->address);
680 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
681 event_defer_errno = addr->basic_errno;
683 router_name = addr->router->name;
684 transport_name = addr->transport->name;
685 deliver_domain = addr->domain;
686 deliver_localpart = addr->local_part;
688 (void) event_raise(action, US"msg:host:defer",
690 ? addr->basic_errno > 0
691 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
692 : string_copy(addr->message)
693 : addr->basic_errno > 0
694 ? string_copy(US strerror(addr->basic_errno))
697 deliver_localpart = save_local;
698 deliver_domain = save_domain;
699 router_name = transport_name = NULL;
705 /*************************************************
706 * Synchronize SMTP responses *
707 *************************************************/
709 /* This function is called from smtp_deliver() to receive SMTP responses from
710 the server, and match them up with the commands to which they relate. When
711 PIPELINING is not in use, this function is called after every command, and is
712 therefore somewhat over-engineered, but it is simpler to use a single scheme
713 that works both with and without PIPELINING instead of having two separate sets
716 The set of commands that are buffered up with pipelining may start with MAIL
717 and may end with DATA; in between are RCPT commands that correspond to the
718 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
719 etc.) are never buffered.
721 Errors after MAIL or DATA abort the whole process leaving the response in the
722 buffer. After MAIL, pending responses are flushed, and the original command is
723 re-instated in big_buffer for error messages. For RCPT commands, the remote is
724 permitted to reject some recipient addresses while accepting others. However
725 certain errors clearly abort the whole process. Set the value in
726 transport_return to PENDING_OK if the address is accepted. If there is a
727 subsequent general error, it will get reset accordingly. If not, it will get
728 converted to OK at the end.
731 addrlist the complete address list
732 include_affixes TRUE if affixes include in RCPT
733 sync_addr ptr to the ptr of the one to start scanning at (updated)
734 host the host we are connected to
735 count the number of responses to read
737 include_sender true if 4xx retry is to include the sender it its key
738 pending_MAIL true if the first response is for MAIL
739 pending_DATA 0 if last command sent was not DATA
740 +1 if previously had a good recipient
741 -1 if not previously had a good recipient
742 inblock incoming SMTP block
743 timeout timeout value
744 buffer buffer for reading response
745 buffsize size of buffer
747 Returns: 3 if at least one address had 2xx and one had 5xx
748 2 if at least one address had 5xx but none had 2xx
749 1 if at least one host had a 2xx response, but none had 5xx
750 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
751 -1 timeout while reading RCPT response
752 -2 I/O or other non-response error for RCPT
753 -3 DATA or MAIL failed - errno and buffer set
757 sync_responses(address_item *addrlist, BOOL include_affixes,
758 address_item **sync_addr, host_item *host, int count,
759 BOOL address_retry_include_sender, BOOL pending_MAIL,
760 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
763 address_item *addr = *sync_addr;
766 /* Handle the response for a MAIL command. On error, reinstate the original
767 command in big_buffer for error message use, and flush any further pending
768 responses before returning, except after I/O errors and timeouts. */
773 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
775 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
776 if (errno == 0 && buffer[0] != 0)
778 uschar flushbuffer[4096];
780 if (buffer[0] == '4')
782 save_errno = ERRNO_MAIL4XX;
783 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
787 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
789 && (errno != 0 || flushbuffer[0] == 0))
795 if (pending_DATA) count--; /* Number of RCPT responses to come */
796 while (count-- > 0) /* Mark any pending addrs with the host used */
798 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
799 addr->host_used = host;
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
808 /* Read and handle the required number of RCPT responses, matching each one up
809 with an address by scanning for the next address whose status is PENDING_DEFER.
814 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
816 /* The address was accepted */
817 addr->host_used = host;
819 if (smtp_read_response(inblock, buffer, buffsize, '2', 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, include_affixes));
843 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
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 || buffer[0] == 0)
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, 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, include_affixes),
868 string_printing(buffer));
869 setflag(addr, af_pass_message);
870 msglog_line(host, addr->message);
872 /* The response was 5xx */
874 if (buffer[0] == '5')
876 addr->transport_return = FAIL;
880 /* The response was 4xx */
884 addr->transport_return = DEFER;
885 addr->basic_errno = ERRNO_RCPT4XX;
886 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
888 /* Log temporary errors if there are more hosts to be tried.
889 If not, log this last one in the == line. */
892 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
897 update_waiting = FALSE;
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
903 if (address_retry_include_sender)
905 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
907 retry_add_item(addr, altkey, 0);
909 else retry_add_item(addr, addr->address_retry_key, 0);
912 } /* Loop for next RCPT response */
914 /* Update where to start at for the next block of responses, unless we
915 have already handled all the addresses. */
917 if (addr != NULL) *sync_addr = addr->next;
919 /* Handle a response to DATA. If we have not had any good recipients, either
920 previously or in this block, the response is ignored. */
922 if (pending_DATA != 0 &&
923 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
928 if (pending_DATA > 0 || (yield & 1) != 0)
930 if (errno == 0 && buffer[0] == '4')
932 errno = ERRNO_DATA4XX;
933 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
937 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
942 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943 present) received 3xx. If any RCPTs were handled and yielded anything other
944 than 4xx, yield will be set non-zero. */
951 /* Do the client side of smtp-level authentication */
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
958 ibp, obp comms channel control blocks
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
965 FAIL_SEND Failed communications - transmit
970 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
975 uschar *fail_reason = US"server did not advertise AUTH support";
977 smtp_authenticated = FALSE;
978 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
979 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
981 if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
985 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
993 if (require_auth == OK ||
994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
997 fail_reason = US"no common mechanisms were found";
999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1022 /* Loop to scan supported server mechanisms */
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1033 while (*p != 0 && !isspace(*p)) p++;
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1063 /* Failure after writing a command */
1068 /* Failure after reading a response */
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1089 /* Internal problem, message in buffer. */
1092 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1093 DEFER, FALSE, NULL);
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
1103 /* If we haven't authenticated, but are required to, give up. */
1105 if (require_auth == OK && !smtp_authenticated)
1107 set_errno(addrlist, ERRNO_AUTHFAIL,
1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
1117 /* Construct AUTH appendix string for MAIL TO */
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1124 Globals smtp_authenticated
1125 client_authenticated_sender
1126 Return True on error, otherwise buffer has (possibly empty) terminated string
1130 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1133 uschar *local_authenticated_sender = authenticated_sender;
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1139 if (ob->authenticated_sender != NULL)
1141 uschar *new = expand_string(ob->authenticated_sender);
1144 if (!expand_string_forcedfail)
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
1148 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1152 else if (new[0] != 0) local_authenticated_sender = new;
1155 /* Add the authenticated sender address if present */
1157 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1173 #ifdef EXPERIMENTAL_DANE
1175 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1176 BOOL dane_required, BOOL * dane)
1178 /* move this out to host.c given the similarity to dns_lookup() ? */
1180 const uschar * fullname = buffer;
1182 /* TLSA lookup string */
1183 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1185 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1188 return DEFER; /* just defer this TLS'd conn */
1194 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1200 if (!dns_is_secure(dnsa))
1202 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1213 /*************************************************
1214 * Deliver address list to given host *
1215 *************************************************/
1217 /* If continue_hostname is not null, we get here only when continuing to
1218 deliver down an existing channel. The channel was passed as the standard
1219 input. TLS is never active on a passed channel; the previous process always
1220 closes it down before passing the connection on.
1222 Otherwise, we have to make a connection to the remote host, and do the
1223 initial protocol exchange.
1225 When running as an MUA wrapper, if the sender or any recipient is rejected,
1226 temporarily or permanently, we force failure for all recipients.
1229 addrlist chain of potential addresses to deliver; only those whose
1230 transport_return field is set to PENDING_DEFER are currently
1231 being processed; others should be skipped - they have either
1232 been delivered to an earlier host or IP address, or been
1233 failed by one of them.
1234 host host to deliver to
1235 host_af AF_INET or AF_INET6
1236 port default TCP/IP port to use, in host byte order
1237 interface interface to bind to, or NULL
1238 tblock transport instance block
1239 message_defer set TRUE if yield is OK, but all addresses were deferred
1240 because of a non-recipient, non-host failure, that is, a
1241 4xx response to MAIL FROM, DATA, or ".". This is a defer
1242 that is specific to the message.
1243 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1244 a second attempt after TLS initialization fails
1246 Returns: OK - the connection was made and the delivery attempted;
1247 the result for each address is in its data block.
1248 DEFER - the connection could not be made, or something failed
1249 while setting up the SMTP session, or there was a
1250 non-message-specific error, such as a timeout.
1251 ERROR - a filter command is specified for this transport,
1252 and there was a problem setting it up; OR helo_data
1253 or add_headers or authenticated_sender is specified
1254 for this transport, and the string failed to expand
1258 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1259 uschar *interface, transport_instance *tblock,
1260 BOOL *message_defer, BOOL suppress_tls)
1263 address_item *sync_addr;
1264 address_item *first_addr = addrlist;
1269 time_t start_delivery_time = time(NULL);
1270 smtp_transport_options_block *ob =
1271 (smtp_transport_options_block *)(tblock->options_block);
1272 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1273 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1275 BOOL send_rset = TRUE;
1276 BOOL send_quit = TRUE;
1277 BOOL setting_up = TRUE;
1278 BOOL completed_address = FALSE;
1281 BOOL pass_message = FALSE;
1282 #ifndef DISABLE_PRDR
1283 BOOL prdr_offered = FALSE;
1286 BOOL dsn_all_lasthop = TRUE;
1287 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1290 dns_answer tlsa_dnsa;
1292 smtp_inblock inblock;
1293 smtp_outblock outblock;
1294 int max_rcpt = tblock->max_addresses;
1295 uschar *igquotstr = US"";
1296 uschar *helo_data = NULL;
1297 uschar *message = NULL;
1298 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1300 uschar buffer[4096];
1301 uschar inbuffer[4096];
1302 uschar outbuffer[4096];
1304 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1306 *message_defer = FALSE;
1307 smtp_command = US"initial connection";
1308 if (max_rcpt == 0) max_rcpt = 999999;
1310 /* Set up the buffer for reading SMTP response packets. */
1312 inblock.buffer = inbuffer;
1313 inblock.buffersize = sizeof(inbuffer);
1314 inblock.ptr = inbuffer;
1315 inblock.ptrend = inbuffer;
1317 /* Set up the buffer for holding SMTP commands while pipelining */
1319 outblock.buffer = outbuffer;
1320 outblock.buffersize = sizeof(outbuffer);
1321 outblock.ptr = outbuffer;
1322 outblock.cmd_count = 0;
1323 outblock.authenticating = FALSE;
1325 /* Reset the parameters of a TLS session. */
1328 tls_out.cipher = NULL; /* the one we may use for this transport */
1329 tls_out.ourcert = NULL;
1330 tls_out.peercert = NULL;
1331 tls_out.peerdn = NULL;
1332 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1335 tls_out.ocsp = OCSP_NOT_REQ;
1337 /* Flip the legacy TLS-related variables over to the outbound set in case
1338 they're used in the context of the transport. Don't bother resetting
1339 afterward as we're in a subprocess. */
1341 tls_modify_variables(&tls_out);
1346 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1347 DEFER, FALSE, NULL);
1352 /* Make a connection to the host if this isn't a continued delivery, and handle
1353 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1354 specially so they can be identified for retries. */
1356 if (continue_hostname == NULL)
1358 /* This puts port into host->port */
1359 inblock.sock = outblock.sock =
1360 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1362 if (inblock.sock < 0)
1364 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1365 NULL, DEFER, FALSE, NULL);
1369 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1371 tls_out.dane_verified = FALSE;
1372 tls_out.tlsa_usage = 0;
1374 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1376 if (host->dnssec == DS_YES)
1379 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1381 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
1384 else if (dane_required)
1386 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1391 ob->tls_tempfail_tryclear = FALSE;
1395 /* Expand the greeting message while waiting for the initial response. (Makes
1396 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1397 delayed till here so that $sending_interface and $sending_port are set. */
1399 helo_data = expand_string(ob->helo_data);
1401 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1402 is nevertheless a reasonably clean way of programming this kind of logic,
1403 where you want to escape on any error. */
1407 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1408 ob->command_timeout)) goto RESPONSE_FAILED;
1410 #ifdef EXPERIMENTAL_EVENT
1413 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1414 : host->dnssec==DS_NO ? US"no" : NULL;
1415 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1418 set_errno(addrlist, ERRNO_EXPANDFAIL,
1419 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1420 DEFER, FALSE, NULL);
1427 /* Now check if the helo_data expansion went well, and sign off cleanly if
1430 if (helo_data == NULL)
1432 uschar *message = string_sprintf("failed to expand helo_data: %s",
1433 expand_string_message);
1434 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1440 /** Debugging without sending a message
1441 addrlist->transport_return = DEFER;
1445 /* Errors that occur after this point follow an SMTP command, which is
1446 left in big_buffer by smtp_write_command() for use in error messages. */
1448 smtp_command = big_buffer;
1450 /* Tell the remote who we are...
1452 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1453 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1454 greeting is of this form. The assumption was that the far end supports it
1455 properly... but experience shows that there are some that give 5xx responses,
1456 even though the banner includes "ESMTP" (there's a bloody-minded one that
1457 says "ESMTP not spoken here"). Cope with that case.
1459 September 2000: Time has passed, and it seems reasonable now to always send
1460 EHLO at the start. It is also convenient to make the change while installing
1463 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1464 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1465 would be no way to send out the mails, so there is now a host list
1466 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1467 PIPELINING problem as well. Maybe it can also be useful to cure other
1468 problems with broken servers.
1470 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1471 Then somebody tried it with a Microsoft mailer... It seems that all other
1472 mailers use upper case for some reason (the RFC is quite clear about case
1473 independence) so, for peace of mind, I gave in. */
1475 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1477 /* Alas; be careful, since this goto is not an error-out, so conceivably
1478 we might set data between here and the target which we assume to exist
1479 and be usable. I can see this coming back to bite us. */
1484 suppress_tls = FALSE;
1485 ob->tls_tempfail_tryclear = FALSE;
1486 smtp_command = US"SSL-on-connect";
1493 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1494 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1496 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1497 ob->command_timeout))
1499 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1506 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1511 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1513 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1514 ob->command_timeout)) goto RESPONSE_FAILED;
1517 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1518 lmtp_ignore_quota option was set. */
1520 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1521 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1522 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1524 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1527 tls_offered = esmtp &&
1528 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1529 PCRE_EOPT, NULL, 0) >= 0;
1532 #ifndef DISABLE_PRDR
1533 prdr_offered = esmtp
1534 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1535 PCRE_EOPT, NULL, 0) >= 0
1536 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1539 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1543 /* For continuing deliveries down the same channel, the socket is the standard
1544 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1545 below). Set up the pointer to where subsequent commands will be left, for
1546 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1547 set from the command line if they were set in the process that passed the
1552 inblock.sock = outblock.sock = fileno(stdin);
1553 smtp_command = big_buffer;
1554 host->port = port; /* Record the port that was used */
1557 /* If TLS is available on this connection, whether continued or not, attempt to
1558 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1559 send another EHLO - the server may give a different answer in secure mode. We
1560 use a separate buffer for reading the response to STARTTLS so that if it is
1561 negative, the original EHLO data is available for subsequent analysis, should
1562 the client not be required to use TLS. If the response is bad, copy the buffer
1563 for error analysis. */
1568 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1570 uschar buffer2[4096];
1571 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1574 /* If there is an I/O error, transmission of this message is deferred. If
1575 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1576 false, we also defer. However, if there is a temporary rejection of STARTTLS
1577 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1578 STARTTLS, we carry on. This means we will try to send the message in clear,
1579 unless the host is in hosts_require_tls (tested below). */
1581 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1582 ob->command_timeout))
1584 if (errno != 0 || buffer2[0] == 0 ||
1585 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1587 Ustrncpy(buffer, buffer2, sizeof(buffer));
1588 goto RESPONSE_FAILED;
1592 /* STARTTLS accepted: try to negotiate a TLS session. */
1597 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1598 # ifdef EXPERIMENTAL_DANE
1599 , dane ? &tlsa_dnsa : NULL
1603 /* TLS negotiation failed; give an error. From outside, this function may
1604 be called again to try in clear on a new connection, if the options permit
1605 it for this host. */
1609 # ifdef EXPERIMENTAL_DANE
1610 if (rc == DEFER && dane && !dane_required)
1612 log_write(0, LOG_MAIN, "DANE attempt failed;"
1613 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1614 host->name, host->address);
1620 save_errno = ERRNO_TLSFAILURE;
1621 message = US"failure while setting up TLS session";
1626 /* TLS session is set up */
1628 for (addr = addrlist; addr != NULL; addr = addr->next)
1629 if (addr->transport_return == PENDING_DEFER)
1631 addr->cipher = tls_out.cipher;
1632 addr->ourcert = tls_out.ourcert;
1633 addr->peercert = tls_out.peercert;
1634 addr->peerdn = tls_out.peerdn;
1635 addr->ocsp = tls_out.ocsp;
1640 /* if smtps, we'll have smtp_command set to something else; always safe to
1642 smtp_command = big_buffer;
1644 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1645 helo_data is null, we are dealing with a connection that was passed from
1646 another process, and so we won't have expanded helo_data above. We have to
1647 expand it here. $sending_ip_address and $sending_port are set up right at the
1648 start of the Exim process (in exim.c). */
1650 if (tls_out.active >= 0)
1653 if (helo_data == NULL)
1655 helo_data = expand_string(ob->helo_data);
1656 if (helo_data == NULL)
1658 uschar *message = string_sprintf("failed to expand helo_data: %s",
1659 expand_string_message);
1660 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1666 /* For SMTPS we need to wait for the initial OK response. */
1669 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1670 ob->command_timeout)) goto RESPONSE_FAILED;
1674 greeting_cmd = "EHLO";
1677 greeting_cmd = "HELO";
1679 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1682 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1683 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1685 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1686 ob->command_timeout))
1687 goto RESPONSE_FAILED;
1690 /* If the host is required to use a secure channel, ensure that we
1694 # ifdef EXPERIMENTAL_DANE
1697 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1700 save_errno = ERRNO_TLSREQUIRED;
1701 message = string_sprintf("a TLS session is required, but %s",
1702 tls_offered? "an attempt to start TLS failed" :
1703 "the server did not offer TLS support");
1706 #endif /*SUPPORT_TLS*/
1708 /* If TLS is active, we have just started it up and re-done the EHLO command,
1709 so its response needs to be analyzed. If TLS is not active and this is a
1710 continued session down a previously-used socket, we haven't just done EHLO, so
1713 if (continue_hostname == NULL
1715 || tls_out.active >= 0
1719 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1720 lmtp_ignore_quota option was set. */
1722 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1723 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1724 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1726 /* If the response to EHLO specified support for the SIZE parameter, note
1727 this, provided size_addition is non-negative. */
1729 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1730 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1731 PCRE_EOPT, NULL, 0) >= 0;
1733 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1734 the current host, esmtp will be false, so PIPELINING can never be used. If
1735 the current host matches hosts_avoid_pipelining, don't do it. */
1737 smtp_use_pipelining = esmtp
1738 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1739 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1740 PCRE_EOPT, NULL, 0) >= 0;
1742 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1743 smtp_use_pipelining? "" : "not ");
1745 #ifndef DISABLE_PRDR
1746 prdr_offered = esmtp
1747 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1748 PCRE_EOPT, NULL, 0) >= 0
1749 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1752 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1755 /* Note if the server supports DSN */
1756 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1757 PCRE_EOPT, NULL, 0) >= 0;
1758 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1760 /* Note if the response to EHLO specifies support for the AUTH extension.
1761 If it has, check that this host is one we want to authenticate to, and do
1762 the business. The host name and address must be available when the
1763 authenticator's client driver is running. */
1765 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1766 ob, esmtp, &inblock, &outblock))
1768 default: goto SEND_QUIT;
1770 case FAIL_SEND: goto SEND_FAILED;
1771 case FAIL: goto RESPONSE_FAILED;
1775 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1776 message-specific. */
1780 /* If there is a filter command specified for this transport, we can now
1781 set it up. This cannot be done until the identify of the host is known. */
1783 if (tblock->filter_command != NULL)
1787 sprintf(CS buffer, "%.50s transport", tblock->name);
1788 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1789 TRUE, DEFER, addrlist, buffer, NULL);
1790 transport_filter_timeout = tblock->filter_timeout;
1792 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1797 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1805 /* For messages that have more than the maximum number of envelope recipients,
1806 we want to send several transactions down the same SMTP connection. (See
1807 comments in deliver.c as to how this reconciles, heuristically, with
1808 remote_max_parallel.) This optimization was added to Exim after the following
1809 code was already working. The simplest way to put it in without disturbing the
1810 code was to use a goto to jump back to this point when there is another
1811 transaction to handle. */
1814 sync_addr = first_addr;
1818 completed_address = FALSE;
1821 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1822 qualification, send it, adding something to the message size to allow for
1823 imprecision and things that get added en route. Exim keeps the number of lines
1824 in a message, so we can give an accurate value for the original message, but we
1825 need some additional to handle added headers. (Double "." characters don't get
1826 included in the count.) */
1833 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1837 #ifndef DISABLE_PRDR
1838 prdr_active = FALSE;
1841 for (addr = first_addr; addr; addr = addr->next)
1842 if (addr->transport_return == PENDING_DEFER)
1844 for (addr = addr->next; addr; addr = addr->next)
1845 if (addr->transport_return == PENDING_DEFER)
1846 { /* at least two recipients to send */
1848 sprintf(CS p, " PRDR"); p += 5;
1856 /* check if all addresses have lasthop flag */
1857 /* do not send RET and ENVID if true */
1858 dsn_all_lasthop = TRUE;
1859 for (addr = first_addr;
1860 address_count < max_rcpt && addr != NULL;
1862 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1863 dsn_all_lasthop = FALSE;
1865 /* Add any DSN flags to the mail command */
1867 if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1869 if (dsn_ret == dsn_ret_hdrs)
1871 Ustrcpy(p, " RET=HDRS");
1874 else if (dsn_ret == dsn_ret_full)
1876 Ustrcpy(p, " RET=FULL");
1879 if (dsn_envid != NULL)
1881 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1886 /* If an authenticated_sender override has been specified for this transport
1887 instance, expand it. If the expansion is forced to fail, and there was already
1888 an authenticated_sender for this message, the original value will be used.
1889 Other expansion failures are serious. An empty result is ignored, but there is
1890 otherwise no check - this feature is expected to be used with LMTP and other
1891 cases where non-standard addresses (e.g. without domains) might be required. */
1893 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1899 /* From here until we send the DATA command, we can make use of PIPELINING
1900 if the server host supports it. The code has to be able to check the responses
1901 at any point, for when the buffer fills up, so we write it totally generally.
1902 When PIPELINING is off, each command written reports that it has flushed the
1905 pending_MAIL = TRUE; /* The block starts with MAIL */
1907 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1908 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1909 mail_command = string_copy(big_buffer); /* Save for later error message */
1913 case -1: /* Transmission error */
1916 case +1: /* Block was sent */
1917 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1918 ob->command_timeout))
1920 if (errno == 0 && buffer[0] == '4')
1922 errno = ERRNO_MAIL4XX;
1923 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1925 goto RESPONSE_FAILED;
1927 pending_MAIL = FALSE;
1931 /* Pass over all the relevant recipient addresses for this host, which are the
1932 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1933 several before we have to read the responses for those seen so far. This
1934 checking is done by a subroutine because it also needs to be done at the end.
1935 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1936 the next one if not all are sent.
1938 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1939 last address because we want to abort if any recipients have any kind of
1940 problem, temporary or permanent. We know that all recipient addresses will have
1941 the PENDING_DEFER status, because only one attempt is ever made, and we know
1942 that max_rcpt will be large, so all addresses will be done at once. */
1944 for (addr = first_addr;
1945 address_count < max_rcpt && addr != NULL;
1951 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
1953 if (addr->transport_return != PENDING_DEFER) continue;
1956 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1958 /* Add any DSN flags to the rcpt command and add to the sent string */
1963 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
1965 if ((addr->dsn_flags & rf_dsnflags) != 0)
1969 Ustrcpy(p, " NOTIFY=");
1971 for (i = 0; i < 4; i++)
1972 if ((addr->dsn_flags & rf_list[i]) != 0)
1974 if (!first) *p++ = ',';
1976 Ustrcpy(p, rf_names[i]);
1981 if (addr->dsn_orcpt != NULL)
1983 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1989 /* Now send the RCPT command, and process outstanding responses when
1990 necessary. After a timeout on RCPT, we just end the function, leaving the
1991 yield as OK, because this error can often mean that there is a problem with
1992 just one address, so we don't want to delay the host. */
1994 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1995 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
1997 if (count < 0) goto SEND_FAILED;
2000 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2001 &sync_addr, host, count, ob->address_retry_include_sender,
2002 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2005 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2006 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2009 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2010 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2011 case 0: /* No 2xx or 5xx, but no probs */
2014 case -1: goto END_OFF; /* Timeout on RCPT */
2015 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2017 pending_MAIL = FALSE; /* Dealt with MAIL */
2019 } /* Loop for next address */
2021 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2022 permanently or temporarily. We should have flushed and synced after the last
2027 address_item *badaddr;
2028 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2029 if (badaddr->transport_return != PENDING_OK)
2031 /*XXX could we find a better errno than 0 here? */
2032 set_errno(addrlist, 0, badaddr->message, FAIL,
2033 testflag(badaddr, af_pass_message), NULL);
2039 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2040 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2041 have a good recipient buffered up if we are pipelining. We don't want to waste
2042 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2043 are pipelining. The responses are all handled by sync_responses(). */
2045 if (ok || (smtp_use_pipelining && !mua_wrapper))
2047 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2048 if (count < 0) goto SEND_FAILED;
2049 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2050 host, count, ob->address_retry_include_sender, pending_MAIL,
2051 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2053 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2054 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2057 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2058 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2059 case 0: break; /* No 2xx or 5xx, but no probs */
2061 case -1: goto END_OFF; /* Timeout on RCPT */
2062 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2066 /* Save the first address of the next batch. */
2070 /* If there were no good recipients (but otherwise there have been no
2071 problems), just set ok TRUE, since we have handled address-specific errors
2072 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2073 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2074 well as body. Set the appropriate timeout value to be used for each chunk.
2075 (Haven't been able to make it work using select() for writing yet.) */
2077 if (!ok) ok = TRUE; else
2079 sigalrm_seen = FALSE;
2080 transport_write_timeout = ob->data_timeout;
2081 smtp_command = US"sending data block"; /* For error messages */
2082 DEBUG(D_transport|D_v)
2083 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2084 transport_count = 0;
2086 #ifndef DISABLE_DKIM
2087 ok = dkim_transport_write_message(addrlist, inblock.sock,
2088 topt_use_crlf | topt_end_dot | topt_escape_headers |
2089 (tblock->body_only? topt_no_headers : 0) |
2090 (tblock->headers_only? topt_no_body : 0) |
2091 (tblock->return_path_add? topt_add_return_path : 0) |
2092 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2093 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2094 0, /* No size limit */
2095 tblock->add_headers, tblock->remove_headers,
2096 US".", US"..", /* Escaping strings */
2097 tblock->rewrite_rules, tblock->rewrite_existflags,
2098 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2099 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2102 ok = transport_write_message(addrlist, inblock.sock,
2103 topt_use_crlf | topt_end_dot | topt_escape_headers |
2104 (tblock->body_only? topt_no_headers : 0) |
2105 (tblock->headers_only? topt_no_body : 0) |
2106 (tblock->return_path_add? topt_add_return_path : 0) |
2107 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2108 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2109 0, /* No size limit */
2110 tblock->add_headers, tblock->remove_headers,
2111 US".", US"..", /* Escaping strings */
2112 tblock->rewrite_rules, tblock->rewrite_existflags);
2115 /* transport_write_message() uses write() because it is called from other
2116 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2117 it can exit with "Broken pipe" as its error. This really means that the
2118 socket got closed at the far end. */
2120 transport_write_timeout = 0; /* for subsequent transports */
2122 /* Failure can either be some kind of I/O disaster (including timeout),
2123 or the failure of a transport filter or the expansion of added headers. */
2127 buffer[0] = 0; /* There hasn't been a response */
2128 goto RESPONSE_FAILED;
2131 /* We used to send the terminating "." explicitly here, but because of
2132 buffering effects at both ends of TCP/IP connections, you don't gain
2133 anything by keeping it separate, so it might as well go in the final
2134 data buffer for efficiency. This is now done by setting the topt_end_dot
2137 smtp_command = US"end of data";
2139 #ifndef DISABLE_PRDR
2140 /* For PRDR we optionally get a partial-responses warning
2141 * followed by the individual responses, before going on with
2142 * the overall response. If we don't get the warning then deal
2143 * with per non-PRDR. */
2146 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2148 if (!ok && errno == 0)
2151 case '2': prdr_active = FALSE;
2154 case '4': errno = ERRNO_DATA4XX;
2155 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2162 /* For non-PRDR SMTP, we now read a single response that applies to the
2163 whole message. If it is OK, then all the addresses have been delivered. */
2167 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2169 if (!ok && errno == 0 && buffer[0] == '4')
2171 errno = ERRNO_DATA4XX;
2172 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2176 /* For LMTP, we get back a response for every RCPT command that we sent;
2177 some may be accepted and some rejected. For those that get a response, their
2178 status is fixed; any that are accepted have been handed over, even if later
2179 responses crash - at least, that's how I read RFC 2033.
2181 If all went well, mark the recipient addresses as completed, record which
2182 host/IPaddress they were delivered to, and cut out RSET when sending another
2183 message down the same channel. Write the completed addresses to the journal
2184 now so that they are recorded in case there is a crash of hardware or
2185 software before the spool gets updated. Also record the final SMTP
2186 confirmation if needed (for SMTP only). */
2191 int delivery_time = (int)(time(NULL) - start_delivery_time);
2193 uschar *conf = NULL;
2196 /* Set up confirmation if needed - applies only to SMTP */
2199 #ifndef EXPERIMENTAL_EVENT
2200 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2205 const uschar *s = string_printing(buffer);
2206 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2207 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2210 /* Process all transported addresses - for LMTP or PRDR, read a status for
2213 for (addr = addrlist; addr != first_addr; addr = addr->next)
2215 if (addr->transport_return != PENDING_OK) continue;
2217 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2218 remaining addresses. Otherwise, it's a return code for just the one
2219 address. For temporary errors, add a retry item for the address so that
2220 it doesn't get tried again too soon. */
2222 #ifndef DISABLE_PRDR
2223 if (lmtp || prdr_active)
2228 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2231 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2232 addr->message = string_sprintf(
2233 #ifndef DISABLE_PRDR
2234 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2236 "LMTP error after %s: %s",
2238 big_buffer, string_printing(buffer));
2239 setflag(addr, af_pass_message); /* Allow message to go to user */
2240 if (buffer[0] == '5')
2241 addr->transport_return = FAIL;
2244 errno = ERRNO_DATA4XX;
2245 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2246 addr->transport_return = DEFER;
2247 #ifndef DISABLE_PRDR
2250 retry_add_item(addr, addr->address_retry_key, 0);
2254 completed_address = TRUE; /* NOW we can set this flag */
2255 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2257 const uschar *s = string_printing(buffer);
2258 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2259 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2263 /* SMTP, or success return from LMTP for this address. Pass back the
2264 actual host that was used. */
2266 addr->transport_return = OK;
2267 addr->more_errno = delivery_time;
2268 addr->host_used = host;
2269 addr->special_action = flag;
2270 addr->message = conf;
2271 #ifndef DISABLE_PRDR
2272 if (prdr_active) addr->flags |= af_prdr_used;
2276 #ifndef DISABLE_PRDR
2280 /* Update the journal. For homonymic addresses, use the base address plus
2281 the transport name. See lots of comments in deliver.c about the reasons
2282 for the complications when homonyms are involved. Just carry on after
2283 write error, as it may prove possible to update the spool file later. */
2285 if (testflag(addr, af_homonym))
2286 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2288 sprintf(CS buffer, "%.500s\n", addr->unique);
2290 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2291 len = Ustrlen(CS buffer);
2292 if (write(journal_fd, buffer, len) != len)
2293 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2294 "%s: %s", buffer, strerror(errno));
2298 #ifndef DISABLE_PRDR
2301 /* PRDR - get the final, overall response. For any non-success
2302 upgrade all the address statuses. */
2303 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2307 if(errno == 0 && buffer[0] == '4')
2309 errno = ERRNO_DATA4XX;
2310 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2312 for (addr = addrlist; addr != first_addr; addr = addr->next)
2313 if (buffer[0] == '5' || addr->transport_return == OK)
2314 addr->transport_return = PENDING_OK; /* allow set_errno action */
2315 goto RESPONSE_FAILED;
2318 /* Update the journal, or setup retry. */
2319 for (addr = addrlist; addr != first_addr; addr = addr->next)
2320 if (addr->transport_return == OK)
2322 if (testflag(addr, af_homonym))
2323 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2325 sprintf(CS buffer, "%.500s\n", addr->unique);
2327 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2328 len = Ustrlen(CS buffer);
2329 if (write(journal_fd, buffer, len) != len)
2330 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2331 "%s: %s", buffer, strerror(errno));
2333 else if (addr->transport_return == DEFER)
2334 retry_add_item(addr, addr->address_retry_key, -2);
2338 /* Ensure the journal file is pushed out to disk. */
2340 if (EXIMfsync(journal_fd) < 0)
2341 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2347 /* Handle general (not specific to one address) failures here. The value of ok
2348 is used to skip over this code on the falling through case. A timeout causes a
2349 deferral. Other errors may defer or fail according to the response code, and
2350 may set up a special errno value, e.g. after connection chopped, which is
2351 assumed if errno == 0 and there is no text in the buffer. If control reaches
2352 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2353 the problem is not related to this specific message. */
2362 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2363 buffer, &code, &message, &pass_message);
2369 message = US string_sprintf("send() to %s [%s] failed: %s",
2370 host->name, host->address, strerror(save_errno));
2374 /* This label is jumped to directly when a TLS negotiation has failed,
2375 or was not done for a host for which it is required. Values will be set
2376 in message and save_errno, and setting_up will always be true. Treat as
2377 a temporary error. */
2384 /* If the failure happened while setting up the call, see if the failure was
2385 a 5xx response (this will either be on connection, or following HELO - a 5xx
2386 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2387 never going to accept them. For other errors during setting up (timeouts or
2388 whatever), defer all addresses, and yield DEFER, so that the host is not
2389 tried again for a while. */
2392 ok = FALSE; /* For when reached by GOTO */
2397 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2400 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2405 /* We want to handle timeouts after MAIL or "." and loss of connection after
2406 "." specially. They can indicate a problem with the sender address or with
2407 the contents of the message rather than a real error on the connection. These
2408 cases are treated in the same way as a 4xx response. This next bit of code
2409 does the classification. */
2420 message_error = TRUE;
2424 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2425 Ustrncmp(smtp_command,"end ",4) == 0;
2428 case ERRNO_SMTPCLOSED:
2429 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2433 message_error = FALSE;
2437 /* Handle the cases that are treated as message errors. These are:
2439 (a) negative response or timeout after MAIL
2440 (b) negative response after DATA
2441 (c) negative response or timeout or dropped connection after "."
2443 It won't be a negative response or timeout after RCPT, as that is dealt
2444 with separately above. The action in all cases is to set an appropriate
2445 error code for all the addresses, but to leave yield set to OK because the
2446 host itself has not failed. Of course, it might in practice have failed
2447 when we've had a timeout, but if so, we'll discover that at the next
2448 delivery attempt. For a temporary error, set the message_defer flag, and
2449 write to the logs for information if this is not the last host. The error
2450 for the last host will be logged as part of the address's log line. */
2454 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2455 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2456 pass_message, host);
2458 /* If there's an errno, the message contains just the identity of
2461 if (code != '5') /* Anything other than 5 is treated as temporary */
2464 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2465 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2466 msglog_line(host, message);
2467 *message_defer = TRUE;
2471 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2472 ".", or some other transportation error. We defer all addresses and yield
2473 DEFER, except for the case of failed add_headers expansion, or a transport
2474 filter failure, when the yield should be ERROR, to stop it trying other
2479 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2480 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2481 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2487 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2488 SMTP session tidily. However, if there were too many addresses to send in one
2489 message (indicated by first_addr being non-NULL) we want to carry on with the
2490 rest of them. Also, it is desirable to send more than one message down the SMTP
2491 connection if there are several waiting, provided we haven't already sent so
2492 many as to hit the configured limit. The function transport_check_waiting looks
2493 for a waiting message and returns its id. Then transport_pass_socket tries to
2494 set up a continued delivery by passing the socket on to another process. The
2495 variable send_rset is FALSE if a message has just been successfully transfered.
2497 If we are already sending down a continued channel, there may be further
2498 addresses not yet delivered that are aimed at the same host, but which have not
2499 been passed in this run of the transport. In this case, continue_more will be
2500 true, and all we should do is send RSET if necessary, and return, leaving the
2503 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2504 do not want to continue with other messages down the same channel, because that
2505 can lead to looping between two or more messages, all with the same,
2506 temporarily failing address(es). [The retry information isn't updated yet, so
2507 new processes keep on trying.] We probably also don't want to try more of this
2508 message's addresses either.
2510 If we have started a TLS session, we have to end it before passing the
2511 connection to a new process. However, not all servers can handle this (Exim
2512 can), so we do not pass such a connection on if the host matches
2513 hosts_nopass_tls. */
2516 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2517 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2518 continue_more, yield, (first_addr == NULL)? "":"not ");
2520 if (completed_address && ok && send_quit)
2523 if ( first_addr != NULL
2525 || ( ( tls_out.active < 0
2526 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2529 transport_check_waiting(tblock->name, host->name,
2530 tblock->connection_max_messages, new_message_id, &more)
2538 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2540 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2541 host->address, strerror(save_errno));
2544 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2545 ob->command_timeout)))
2548 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2552 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2553 host->name, host->address, msg);
2558 /* Either RSET was not needed, or it succeeded */
2562 if (first_addr != NULL) /* More addresses still to be sent */
2563 { /* in this run of the transport */
2564 continue_sequence++; /* Causes * in logging */
2567 if (continue_more) return yield; /* More addresses for another run */
2569 /* Pass the socket to a new Exim process. Before doing so, we must shut
2570 down TLS. Not all MTAs allow for the continuation of the SMTP session
2571 when TLS is shut down. We test for this by sending a new EHLO. If we
2572 don't get a good response, we don't attempt to pass the socket on. */
2575 if (tls_out.active >= 0)
2577 tls_close(FALSE, TRUE);
2581 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2582 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2583 ob->command_timeout);
2587 /* If the socket is successfully passed, we musn't send QUIT (or
2588 indeed anything!) from here. */
2590 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2591 new_message_id, inblock.sock))
2597 /* If RSET failed and there are addresses left, they get deferred. */
2599 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2603 /* End off tidily with QUIT unless the connection has died or the socket has
2604 been passed to another process. There has been discussion on the net about what
2605 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2606 to wait for a response, but on the other hand, there isn't anything one can do
2607 with an error response, other than log it. Exim used to do that. However,
2608 further discussion suggested that it is positively advantageous not to wait for
2609 the response, but to close the session immediately. This is supposed to move
2610 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2611 load from the server. (Hosts that are both servers and clients may not see much
2612 difference, of course.) Further discussion indicated that this was safe to do
2613 on Unix systems which have decent implementations of TCP/IP that leave the
2614 connection around for a while (TIME_WAIT) after the application has gone away.
2615 This enables the response sent by the server to be properly ACKed rather than
2616 timed out, as can happen on broken TCP/IP implementations on other OS.
2618 This change is being made on 31-Jul-98. After over a year of trouble-free
2619 operation, the old commented-out code was removed on 17-Sep-99. */
2622 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2627 tls_close(FALSE, TRUE);
2630 /* Close the socket, and return the appropriate value, first setting
2631 works because the NULL setting is passed back to the calling process, and
2632 remote_max_parallel is forced to 1 when delivering over an existing connection,
2634 If all went well and continue_more is set, we shouldn't actually get here if
2635 there are further addresses, as the return above will be taken. However,
2636 writing RSET might have failed, or there may be other addresses whose hosts are
2637 specified in the transports, and therefore not visible at top level, in which
2638 case continue_more won't get set. */
2640 (void)close(inblock.sock);
2642 #ifdef EXPERIMENTAL_EVENT
2643 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2646 continue_transport = NULL;
2647 continue_hostname = NULL;
2654 /*************************************************
2655 * Closedown entry point *
2656 *************************************************/
2658 /* This function is called when exim is passed an open smtp channel
2659 from another incarnation, but the message which it has been asked
2660 to deliver no longer exists. The channel is on stdin.
2662 We might do fancy things like looking for another message to send down
2663 the channel, but if the one we sought has gone, it has probably been
2664 delivered by some other process that itself will seek further messages,
2665 so just close down our connection.
2667 Argument: pointer to the transport instance block
2672 smtp_transport_closedown(transport_instance *tblock)
2674 smtp_transport_options_block *ob =
2675 (smtp_transport_options_block *)(tblock->options_block);
2676 smtp_inblock inblock;
2677 smtp_outblock outblock;
2679 uschar inbuffer[4096];
2680 uschar outbuffer[16];
2682 inblock.sock = fileno(stdin);
2683 inblock.buffer = inbuffer;
2684 inblock.buffersize = sizeof(inbuffer);
2685 inblock.ptr = inbuffer;
2686 inblock.ptrend = inbuffer;
2688 outblock.sock = inblock.sock;
2689 outblock.buffersize = sizeof(outbuffer);
2690 outblock.buffer = outbuffer;
2691 outblock.ptr = outbuffer;
2692 outblock.cmd_count = 0;
2693 outblock.authenticating = FALSE;
2695 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2696 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2697 ob->command_timeout);
2698 (void)close(inblock.sock);
2703 /*************************************************
2704 * Prepare addresses for delivery *
2705 *************************************************/
2707 /* This function is called to flush out error settings from previous delivery
2708 attempts to other hosts. It also records whether we got here via an MX record
2709 or not in the more_errno field of the address. We are interested only in
2710 addresses that are still marked DEFER - others may have got delivered to a
2711 previously considered IP address. Set their status to PENDING_DEFER to indicate
2712 which ones are relevant this time.
2715 addrlist the list of addresses
2716 host the host we are delivering to
2718 Returns: the first address for this delivery
2721 static address_item *
2722 prepare_addresses(address_item *addrlist, host_item *host)
2724 address_item *first_addr = NULL;
2726 for (addr = addrlist; addr != NULL; addr = addr->next)
2727 if (addr->transport_return == DEFER)
2729 if (first_addr == NULL) first_addr = addr;
2730 addr->transport_return = PENDING_DEFER;
2731 addr->basic_errno = 0;
2732 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2733 addr->message = NULL;
2735 addr->cipher = NULL;
2736 addr->ourcert = NULL;
2737 addr->peercert = NULL;
2738 addr->peerdn = NULL;
2739 addr->ocsp = OCSP_NOT_REQ;
2747 /*************************************************
2748 * Main entry point *
2749 *************************************************/
2751 /* See local README for interface details. As this is a remote transport, it is
2752 given a chain of addresses to be delivered in one connection, if possible. It
2753 always returns TRUE, indicating that each address has its own independent
2754 status set, except if there is a setting up problem, in which case it returns
2758 smtp_transport_entry(
2759 transport_instance *tblock, /* data for this instantiation */
2760 address_item *addrlist) /* addresses we are working on */
2764 int hosts_defer = 0;
2766 int hosts_looked_up = 0;
2767 int hosts_retry = 0;
2768 int hosts_serial = 0;
2769 int hosts_total = 0;
2770 int total_hosts_tried = 0;
2772 BOOL expired = TRUE;
2773 BOOL continuing = continue_hostname != NULL;
2774 uschar *expanded_hosts = NULL;
2776 uschar *tid = string_sprintf("%s transport", tblock->name);
2777 smtp_transport_options_block *ob =
2778 (smtp_transport_options_block *)(tblock->options_block);
2779 host_item *hostlist = addrlist->host_list;
2780 host_item *host = NULL;
2784 debug_printf("%s transport entered\n", tblock->name);
2785 for (addr = addrlist; addr != NULL; addr = addr->next)
2786 debug_printf(" %s\n", addr->address);
2787 if (continuing) debug_printf("already connected to %s [%s]\n",
2788 continue_hostname, continue_host_address);
2791 /* Set the flag requesting that these hosts be added to the waiting
2792 database if the delivery fails temporarily or if we are running with
2793 queue_smtp or a 2-stage queue run. This gets unset for certain
2794 kinds of error, typically those that are specific to the message. */
2796 update_waiting = TRUE;
2798 /* If a host list is not defined for the addresses - they must all have the
2799 same one in order to be passed to a single transport - or if the transport has
2800 a host list with hosts_override set, use the host list supplied with the
2801 transport. It is an error for this not to exist. */
2803 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2805 if (ob->hosts == NULL)
2807 addrlist->message = string_sprintf("%s transport called with no hosts set",
2809 addrlist->transport_return = PANIC;
2810 return FALSE; /* Only top address has status */
2813 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2816 /* If the transport's host list contains no '$' characters, and we are not
2817 randomizing, it is fixed and therefore a chain of hosts can be built once
2818 and for all, and remembered for subsequent use by other calls to this
2819 transport. If, on the other hand, the host list does contain '$', or we are
2820 randomizing its order, we have to rebuild it each time. In the fixed case,
2821 as the hosts string will never be used again, it doesn't matter that we
2822 replace all the : characters with zeros. */
2824 if (ob->hostlist == NULL)
2826 uschar *s = ob->hosts;
2828 if (Ustrchr(s, '$') != NULL)
2830 if (!(expanded_hosts = expand_string(s)))
2832 addrlist->message = string_sprintf("failed to expand list of hosts "
2833 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2834 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2835 return FALSE; /* Only top address has status */
2837 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2838 "\"%s\"\n", s, expanded_hosts);
2842 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2844 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2846 /* Check that the expansion yielded something useful. */
2847 if (hostlist == NULL)
2850 string_sprintf("%s transport has empty hosts setting", tblock->name);
2851 addrlist->transport_return = PANIC;
2852 return FALSE; /* Only top address has status */
2855 /* If there was no expansion of hosts, save the host list for
2858 if (!expanded_hosts) ob->hostlist = hostlist;
2861 /* This is not the first time this transport has been run in this delivery;
2862 the host list was built previously. */
2865 hostlist = ob->hostlist;
2868 /* The host list was supplied with the address. If hosts_randomize is set, we
2869 must sort it into a random order if it did not come from MX records and has not
2870 already been randomized (but don't bother if continuing down an existing
2873 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2875 host_item *newlist = NULL;
2876 while (hostlist != NULL)
2878 host_item *h = hostlist;
2879 hostlist = hostlist->next;
2881 h->sort_key = random_number(100);
2883 if (newlist == NULL)
2888 else if (h->sort_key < newlist->sort_key)
2895 host_item *hh = newlist;
2896 while (hh->next != NULL)
2898 if (h->sort_key < hh->next->sort_key) break;
2906 hostlist = addrlist->host_list = newlist;
2909 /* Sort out the default port. */
2911 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2913 /* For each host-plus-IP-address on the list:
2915 . If this is a continued delivery and the host isn't the one with the
2916 current connection, skip.
2918 . If the status is unusable (i.e. previously failed or retry checked), skip.
2920 . If no IP address set, get the address, either by turning the name into
2921 an address, calling gethostbyname if gethostbyname is on, or by calling
2922 the DNS. The DNS may yield multiple addresses, in which case insert the
2923 extra ones into the list.
2925 . Get the retry data if not previously obtained for this address and set the
2926 field which remembers the state of this address. Skip if the retry time is
2927 not reached. If not, remember whether retry data was found. The retry string
2928 contains both the name and the IP address.
2930 . Scan the list of addresses and mark those whose status is DEFER as
2931 PENDING_DEFER. These are the only ones that will be processed in this cycle
2934 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2935 Some addresses may be successfully delivered, others may fail, and yet
2936 others may get temporary errors and so get marked DEFER.
2938 . The return from the delivery attempt is OK if a connection was made and a
2939 valid SMTP dialogue was completed. Otherwise it is DEFER.
2941 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2943 . If fail to connect, or other defer state, add a retry item.
2945 . If there are any addresses whose status is still DEFER, carry on to the
2946 next host/IPaddress, unless we have tried the number of hosts given
2947 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2948 there is some fancy logic for hosts_max_try that means its limit can be
2949 overstepped in some circumstances.
2951 If we get to the end of the list, all hosts have deferred at least one address,
2952 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2953 delivery attempt to those hosts whose last try was before the arrival time of
2954 the current message. To cope with this, we have to go round the loop a second
2955 time. After that, set the status and error data for any addresses that haven't
2956 had it set already. */
2958 for (cutoff_retry = 0; expired &&
2959 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2962 host_item *nexthost = NULL;
2963 int unexpired_hosts_tried = 0;
2965 for (host = hostlist;
2967 unexpired_hosts_tried < ob->hosts_max_try &&
2968 total_hosts_tried < ob->hosts_max_try_hardlimit;
2974 BOOL serialized = FALSE;
2975 BOOL host_is_expired = FALSE;
2976 BOOL message_defer = FALSE;
2977 BOOL ifchanges = FALSE;
2978 BOOL some_deferred = FALSE;
2979 address_item *first_addr = NULL;
2980 uschar *interface = NULL;
2981 uschar *retry_host_key = NULL;
2982 uschar *retry_message_key = NULL;
2983 uschar *serialize_key = NULL;
2985 /* Default next host is next host. :-) But this can vary if the
2986 hosts_max_try limit is hit (see below). It may also be reset if a host
2987 address is looked up here (in case the host was multihomed). */
2989 nexthost = host->next;
2991 /* If the address hasn't yet been obtained from the host name, look it up
2992 now, unless the host is already marked as unusable. If it is marked as
2993 unusable, it means that the router was unable to find its IP address (in
2994 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2995 the lookup failed last time. We don't get this far if *all* MX records
2996 point to non-existent hosts; that is treated as a hard error.
2998 We can just skip this host entirely. When the hosts came from the router,
2999 the address will timeout based on the other host(s); when the address is
3000 looked up below, there is an explicit retry record added.
3002 Note that we mustn't skip unusable hosts if the address is not unset; they
3003 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3005 if (host->address == NULL)
3007 int new_port, flags;
3010 if (host->status >= hstatus_unusable)
3012 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3017 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3019 /* The host name is permitted to have an attached port. Find it, and
3020 strip it from the name. Just remember it for now. */
3022 new_port = host_item_get_port(host);
3024 /* Count hosts looked up */
3028 /* Find by name if so configured, or if it's an IP address. We don't
3029 just copy the IP address, because we need the test-for-local to happen. */
3031 flags = HOST_FIND_BY_A;
3032 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3033 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3035 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3036 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3038 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3039 ob->dnssec_request_domains, ob->dnssec_require_domains,
3042 /* Update the host (and any additional blocks, resulting from
3043 multihoming) with a host-specific port, if any. */
3045 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3047 /* Failure to find the host at this time (usually DNS temporary failure)
3048 is really a kind of routing failure rather than a transport failure.
3049 Therefore we add a retry item of the routing kind, not to stop us trying
3050 to look this name up here again, but to ensure the address gets timed
3051 out if the failures go on long enough. A complete failure at this point
3052 commonly points to a configuration error, but the best action is still
3053 to carry on for the next host. */
3055 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3057 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3059 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3060 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3061 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3062 host->status = hstatus_unusable;
3064 for (addr = addrlist; addr != NULL; addr = addr->next)
3066 if (addr->transport_return != DEFER) continue;
3067 addr->basic_errno = ERRNO_UNKNOWNHOST;
3069 string_sprintf("failed to lookup IP address for %s", host->name);
3074 /* If the host is actually the local host, we may have a problem, or
3075 there may be some cunning configuration going on. In the problem case,
3076 log things and give up. The default transport status is already DEFER. */
3078 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3080 for (addr = addrlist; addr != NULL; addr = addr->next)
3082 addr->basic_errno = 0;
3083 addr->message = string_sprintf("%s transport found host %s to be "
3084 "local", tblock->name, host->name);
3088 } /* End of block for IP address lookup */
3090 /* If this is a continued delivery, we are interested only in the host
3091 which matches the name of the existing open channel. The check is put
3092 here after the local host lookup, in case the name gets expanded as a
3093 result of the lookup. Set expired FALSE, to save the outer loop executing
3096 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3097 Ustrcmp(continue_host_address, host->address) != 0))
3100 continue; /* With next host */
3103 /* Reset the default next host in case a multihomed host whose addresses
3104 are not looked up till just above added to the host list. */
3106 nexthost = host->next;
3108 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3109 domain is in queue_smtp_domains, we don't actually want to attempt any
3110 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3111 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3112 were not in it. We don't want to hold up all SMTP deliveries! Except when
3113 doing a two-stage queue run, don't do this if forcing. */
3115 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3116 match_isinlist(addrlist->domain,
3117 (const uschar **)&queue_smtp_domains, 0,
3118 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3121 for (addr = addrlist; addr != NULL; addr = addr->next)
3123 if (addr->transport_return != DEFER) continue;
3124 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3126 continue; /* With next host */
3129 /* Count hosts being considered - purely for an intelligent comment
3130 if none are usable. */
3134 /* Set $host and $host address now in case they are needed for the
3135 interface expansion or the serialize_hosts check; they remain set if an
3136 actual delivery happens. */
3138 deliver_host = host->name;
3139 deliver_host_address = host->address;
3140 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3141 : host->dnssec == DS_NO ? US"no"
3144 /* Set up a string for adding to the retry key if the port number is not
3145 the standard SMTP port. A host may have its own port setting that overrides
3148 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3150 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3152 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3153 string changes upon expansion, we must add it to the key that is used for
3154 retries, because connections to the same host from a different interface
3155 should be treated separately. */
3157 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3158 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3161 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3163 /* The first time round the outer loop, check the status of the host by
3164 inspecting the retry data. The second time round, we are interested only
3165 in expired hosts that haven't been tried since this message arrived. */
3167 if (cutoff_retry == 0)
3170 /* Ensure the status of the address is set by checking retry data if
3171 necessary. There may be host-specific retry data (applicable to all
3172 messages) and also data for retries of a specific message at this host.
3173 If either of these retry records are actually read, the keys used are
3174 returned to save recomputing them later. */
3176 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3177 US"retry_include_ip_address", ob->retry_include_ip_address,
3178 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3179 continue; /* with next host */
3181 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3182 incl_ip, &retry_host_key, &retry_message_key);
3184 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3185 (host->address == NULL)? US"" : host->address, pistring,
3186 (host->status == hstatus_usable)? "usable" :
3187 (host->status == hstatus_unusable)? "unusable" :
3188 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3190 /* Skip this address if not usable at this time, noting if it wasn't
3191 actually expired, both locally and in the address. */
3193 switch (host->status)
3195 case hstatus_unusable:
3197 setflag(addrlist, af_retry_skipped);
3200 case hstatus_unusable_expired:
3203 case hwhy_retry: hosts_retry++; break;
3204 case hwhy_failed: hosts_fail++; break;
3205 case hwhy_deferred: hosts_defer++; break;
3208 /* If there was a retry message key, implying that previously there
3209 was a message-specific defer, we don't want to update the list of
3210 messages waiting for these hosts. */
3212 if (retry_message_key != NULL) update_waiting = FALSE;
3213 continue; /* With the next host or IP address */
3217 /* Second time round the loop: if the address is set but expired, and
3218 the message is newer than the last try, let it through. */
3222 if (host->address == NULL ||
3223 host->status != hstatus_unusable_expired ||
3224 host->last_try > received_time)
3227 debug_printf("trying expired host %s [%s]%s\n",
3228 host->name, host->address, pistring);
3229 host_is_expired = TRUE;
3232 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3233 it remains TRUE only if all hosts are expired and none are actually tried.
3238 /* If this host is listed as one to which access must be serialized,
3239 see if another Exim process has a connection to it, and if so, skip
3240 this host. If not, update the database to record our connection to it
3241 and remember this for later deletion. Do not do any of this if we are
3242 sending the message down a pre-existing connection. */
3245 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3247 serialize_key = string_sprintf("host-serialize-%s", host->name);
3248 if (!enq_start(serialize_key))
3251 debug_printf("skipping host %s because another Exim process "
3252 "is connected to it\n", host->name);
3259 /* OK, we have an IP address that is not waiting for its retry time to
3260 arrive (it might be expired) OR (second time round the loop) we have an
3261 expired host that hasn't been tried since the message arrived. Have a go
3262 at delivering the message to it. First prepare the addresses by flushing
3263 out the result of previous attempts, and finding the first address that
3264 is still to be delivered. */
3266 first_addr = prepare_addresses(addrlist, host);
3268 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3269 message_id, host->name, host->address, addrlist->address,
3270 (addrlist->next == NULL)? "" : ", ...");
3272 set_process_info("delivering %s to %s [%s] (%s%s)",
3273 message_id, host->name, host->address, addrlist->address,
3274 (addrlist->next == NULL)? "" : ", ...");
3276 /* This is not for real; don't do the delivery. If there are
3277 any remaining hosts, list them. */
3282 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3283 for (addr = addrlist; addr != NULL; addr = addr->next)
3285 addr->host_used = host;
3286 addr->special_action = '*';
3287 addr->message = US"delivery bypassed by -N option";
3291 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3292 "*** host and remaining hosts:\n", tblock->name);
3293 for (host2 = host; host2 != NULL; host2 = host2->next)
3294 debug_printf(" %s [%s]\n", host2->name,
3295 (host2->address == NULL)? US"unset" : host2->address);
3300 /* This is for real. If the host is expired, we don't count it for
3301 hosts_max_retry. This ensures that all hosts must expire before an address
3302 is timed out, unless hosts_max_try_hardlimit (which protects against
3303 lunatic DNS configurations) is reached.
3305 If the host is not expired and we are about to hit the hosts_max_retry
3306 limit, check to see if there is a subsequent hosts with a different MX
3307 value. If so, make that the next host, and don't count this one. This is a
3308 heuristic to make sure that different MXs do get tried. With a normal kind
3309 of retry rule, they would get tried anyway when the earlier hosts were
3310 delayed, but if the domain has a "retry every time" type of rule - as is
3311 often used for the the very large ISPs, that won't happen. */
3316 /* Make a copy of the host if it is local to this invocation
3317 of the transport. */
3321 thost = store_get(sizeof(host_item));
3323 thost->name = string_copy(host->name);
3324 thost->address = string_copy(host->address);
3329 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3333 debug_printf("hosts_max_try limit reached with this host\n");
3334 for (h = host; h != NULL; h = h->next)
3335 if (h->mx != host->mx) break;
3339 unexpired_hosts_tried--;
3340 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3341 "and will be tried\n");
3345 /* Attempt the delivery. */
3347 total_hosts_tried++;
3348 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3349 &message_defer, FALSE);
3352 OK => connection made, each address contains its result;
3353 message_defer is set for message-specific defers (when all
3354 recipients are marked defer)
3355 DEFER => there was a non-message-specific delivery problem;
3356 ERROR => there was a problem setting up the arguments for a filter,
3357 or there was a problem with expanding added headers
3360 /* If the result is not OK, there was a non-message-specific problem.
3361 If the result is DEFER, we need to write to the logs saying what happened
3362 for this particular host, except in the case of authentication and TLS
3363 failures, where the log has already been written. If all hosts defer a
3364 general message is written at the end. */
3366 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3367 first_addr->basic_errno != ERRNO_TLSFAILURE)
3368 write_logs(first_addr, host);
3370 #ifdef EXPERIMENTAL_EVENT
3372 deferred_event_raise(first_addr, host);
3375 /* If STARTTLS was accepted, but there was a failure in setting up the
3376 TLS session (usually a certificate screwup), and the host is not in
3377 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3378 TLS forcibly turned off. We have to start from scratch with a new SMTP
3379 connection. That's why the retry is done from here, not from within
3380 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3381 session, so the in-clear transmission after those errors, if permitted,
3382 happens inside smtp_deliver().] */
3386 && first_addr->basic_errno == ERRNO_TLSFAILURE
3387 && ob->tls_tempfail_tryclear
3388 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3391 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3392 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3393 first_addr = prepare_addresses(addrlist, host);
3394 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3395 &message_defer, TRUE);
3396 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3397 write_logs(first_addr, host);
3398 # ifdef EXPERIMENTAL_EVENT
3400 deferred_event_raise(first_addr, host);
3403 #endif /*SUPPORT_TLS*/
3406 /* Delivery attempt finished */
3408 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3411 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3412 message_id, host->name, host->address, addrlist->address,
3413 (addrlist->next == NULL)? "" : " (& others)", rs);
3415 /* Release serialization if set up */
3417 if (serialized) enq_end(serialize_key);
3419 /* If the result is DEFER, or if a host retry record is known to exist, we
3420 need to add an item to the retry chain for updating the retry database
3421 at the end of delivery. We only need to add the item to the top address,
3422 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3423 for any other delivery attempts using the same address. (It is copied into
3424 the unusable tree at the outer level, so even if different address blocks
3425 contain the same address, it still won't get tried again.) */
3427 if (rc == DEFER || retry_host_key != NULL)
3429 int delete_flag = (rc != DEFER)? rf_delete : 0;
3430 if (retry_host_key == NULL)
3433 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3434 US"retry_include_ip_address", ob->retry_include_ip_address,
3435 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3436 incl_ip = TRUE; /* error; use most-specific retry record */
3438 retry_host_key = incl_ip ?
3439 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3440 string_sprintf("T:%S%s", host->name, pistring);
3443 /* If a delivery of another message over an existing SMTP connection
3444 yields DEFER, we do NOT set up retry data for the host. This covers the
3445 case when there are delays in routing the addresses in the second message
3446 that are so long that the server times out. This is alleviated by not
3447 routing addresses that previously had routing defers when handling an
3448 existing connection, but even so, this case may occur (e.g. if a
3449 previously happily routed address starts giving routing defers). If the
3450 host is genuinely down, another non-continued message delivery will
3451 notice it soon enough. */
3453 if (delete_flag != 0 || !continuing)
3454 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3456 /* We may have tried an expired host, if its retry time has come; ensure
3457 the status reflects the expiry for the benefit of any other addresses. */
3461 host->status = (host_is_expired)?
3462 hstatus_unusable_expired : hstatus_unusable;
3463 host->why = hwhy_deferred;
3467 /* If message_defer is set (host was OK, but every recipient got deferred
3468 because of some message-specific problem), or if that had happened
3469 previously so that a message retry key exists, add an appropriate item
3470 to the retry chain. Note that if there was a message defer but now there is
3471 a host defer, the message defer record gets deleted. That seems perfectly
3472 reasonable. Also, stop the message from being remembered as waiting
3473 for specific hosts. */
3475 if (message_defer || retry_message_key != NULL)
3477 int delete_flag = message_defer? 0 : rf_delete;
3478 if (retry_message_key == NULL)
3481 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3482 US"retry_include_ip_address", ob->retry_include_ip_address,
3483 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3484 incl_ip = TRUE; /* error; use most-specific retry record */
3486 retry_message_key = incl_ip ?
3487 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3489 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3491 retry_add_item(addrlist, retry_message_key,
3492 rf_message | rf_host | delete_flag);
3493 update_waiting = FALSE;
3496 /* Any return other than DEFER (that is, OK or ERROR) means that the
3497 addresses have got their final statuses filled in for this host. In the OK
3498 case, see if any of them are deferred. */
3502 for (addr = addrlist; addr != NULL; addr = addr->next)
3504 if (addr->transport_return == DEFER)
3506 some_deferred = TRUE;
3512 /* If no addresses deferred or the result was ERROR, return. We do this for
3513 ERROR because a failing filter set-up or add_headers expansion is likely to
3514 fail for any host we try. */
3516 if (rc == ERROR || (rc == OK && !some_deferred))
3518 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3519 return TRUE; /* Each address has its status */
3522 /* If the result was DEFER or some individual addresses deferred, let
3523 the loop run to try other hosts with the deferred addresses, except for the
3524 case when we were trying to deliver down an existing channel and failed.
3525 Don't try any other hosts in this case. */
3527 if (continuing) break;
3529 /* If the whole delivery, or some individual addresses, were deferred and
3530 there are more hosts that could be tried, do not count this host towards
3531 the hosts_max_try limit if the age of the message is greater than the
3532 maximum retry time for this host. This means we may try try all hosts,
3533 ignoring the limit, when messages have been around for some time. This is
3534 important because if we don't try all hosts, the address will never time
3535 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3537 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3540 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3542 if (retry != NULL && retry->rules != NULL)
3544 retry_rule *last_rule;
3545 for (last_rule = retry->rules;
3546 last_rule->next != NULL;
3547 last_rule = last_rule->next);
3548 timedout = time(NULL) - received_time > last_rule->timeout;
3550 else timedout = TRUE; /* No rule => timed out */
3554 unexpired_hosts_tried--;
3555 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3556 "hosts_max_try (message older than host's retry time)\n");
3559 } /* End of loop for trying multiple hosts. */
3561 /* This is the end of the loop that repeats iff expired is TRUE and
3562 ob->delay_after_cutoff is FALSE. The second time round we will
3563 try those hosts that haven't been tried since the message arrived. */
3567 debug_printf("all IP addresses skipped or deferred at least one address\n");
3568 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3569 debug_printf("retrying IP addresses not tried since message arrived\n");
3574 /* Get here if all IP addresses are skipped or defer at least one address. In
3575 MUA wrapper mode, this will happen only for connection or other non-message-
3576 specific failures. Force the delivery status for all addresses to FAIL. */
3580 for (addr = addrlist; addr != NULL; addr = addr->next)
3581 addr->transport_return = FAIL;
3585 /* In the normal, non-wrapper case, add a standard message to each deferred
3586 address if there hasn't been an error, that is, if it hasn't actually been
3587 tried this time. The variable "expired" will be FALSE if any deliveries were
3588 actually tried, or if there was at least one host that was not expired. That
3589 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3590 a delivery has been tried, an error code will be set, and the failing of the
3591 message is handled by the retry code later.
3593 If queue_smtp is set, or this transport was called to send a subsequent message
3594 down an existing TCP/IP connection, and something caused the host not to be
3595 found, we end up here, but can detect these cases and handle them specially. */
3597 for (addr = addrlist; addr != NULL; addr = addr->next)
3599 /* If host is not NULL, it means that we stopped processing the host list
3600 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3601 means we need to behave as if some hosts were skipped because their retry
3602 time had not come. Specifically, this prevents the address from timing out.
3603 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3604 hosts were tried. */
3608 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3611 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3612 "hosts were tried\n");
3617 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3618 setflag(addr, af_retry_skipped);
3622 if (queue_smtp) /* no deliveries attempted */
3624 addr->transport_return = DEFER;
3625 addr->basic_errno = 0;
3626 addr->message = US"SMTP delivery explicitly queued";
3629 else if (addr->transport_return == DEFER &&
3630 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3631 addr->message == NULL)
3633 addr->basic_errno = ERRNO_HRETRY;
3634 if (continue_hostname != NULL)
3636 addr->message = US"no host found for existing SMTP connection";
3640 setflag(addr, af_pass_message); /* This is not a security risk */
3641 addr->message = (ob->delay_after_cutoff)?
3642 US"retry time not reached for any host after a long failure period" :
3643 US"all hosts have been failing for a long time and were last tried "
3644 "after this message arrived";
3646 /* If we are already using fallback hosts, or there are no fallback hosts
3647 defined, convert the result to FAIL to cause a bounce. */
3649 if (addr->host_list == addr->fallback_hosts ||
3650 addr->fallback_hosts == NULL)
3651 addr->transport_return = FAIL;
3655 if (hosts_retry == hosts_total)
3656 addr->message = US"retry time not reached for any host";
3657 else if (hosts_fail == hosts_total)
3658 addr->message = US"all host address lookups failed permanently";
3659 else if (hosts_defer == hosts_total)
3660 addr->message = US"all host address lookups failed temporarily";
3661 else if (hosts_serial == hosts_total)
3662 addr->message = US"connection limit reached for all hosts";
3663 else if (hosts_fail+hosts_defer == hosts_total)
3664 addr->message = US"all host address lookups failed";
3665 else addr->message = US"some host address lookups failed and retry time "
3666 "not reached for other hosts or connection limit reached";
3671 /* Update the database which keeps information about which messages are waiting
3672 for which hosts to become available. For some message-specific errors, the
3673 update_waiting flag is turned off because we don't want follow-on deliveries in
3674 those cases. If this transport instance is explicitly limited to one message
3675 per connection then follow-on deliveries are not possible and there's no need
3676 to create/update the per-transport wait-<transport_name> database. */
3678 if (update_waiting && tblock->connection_max_messages != 1)
3679 transport_update_waiting(hostlist, tblock->name);
3683 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3685 return TRUE; /* Each address has its status */
3690 /* End of transport/smtp.c */
git://git.exim.org / users / jgh / exim.git / blob