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 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
58 { "dnssec_request_domains", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
60 { "dnssec_require_domains", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
72 ignore; 4.83 will warn, and a later-still release will remove
73 these options, so that using them becomes an error. */
74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
112 # ifdef EXPERIMENTAL_DANE
113 { "hosts_require_dane", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
116 # ifndef DISABLE_OCSP
117 { "hosts_require_ocsp", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
120 { "hosts_require_tls", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
123 { "hosts_try_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
125 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
126 { "hosts_try_dane", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 #ifdef EXPERIMENTAL_CERTNAMES
175 { "tls_verify_cert_hostnames", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
178 { "tls_verify_certificates", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
185 /* Size of the options list. An extern variable has to be used so that its
186 address can appear in the tables drtables.c. */
188 int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
191 /* Default private options block for the smtp transport. */
193 smtp_transport_options_block smtp_transport_option_defaults = {
195 NULL, /* fallback_hosts */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
202 US"smtp", /* protocol */
204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
207 #ifdef EXPERIMENTAL_DANE
208 NULL, /* hosts_try_dane */
209 NULL, /* hosts_require_dane */
212 NULL, /* hosts_try_prdr */
215 US"*", /* hosts_request_ocsp (except under DANE) */
216 NULL, /* hosts_require_ocsp */
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 US"*", /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
223 NULL, /* hosts_nopass_tls */
224 5*60, /* command_timeout */
225 5*60, /* connect_timeout; shorter system default overrides */
226 5*60, /* data timeout */
227 10*60, /* final timeout */
228 1024, /* size_addition */
229 5, /* hosts_max_try */
230 50, /* hosts_max_try_hardlimit */
231 TRUE, /* address_retry_include_sender */
232 FALSE, /* allow_localhost */
233 FALSE, /* authenticated_sender_force */
234 FALSE, /* gethostbyname */
235 TRUE, /* dns_qualify_single */
236 FALSE, /* dns_search_parents */
237 NULL, /* dnssec_request_domains */
238 NULL, /* dnssec_require_domains */
239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
243 FALSE, /* lmtp_ignore_quota */
244 TRUE /* retry_include_ip_address */
246 ,NULL, /* tls_certificate */
248 NULL, /* tls_privatekey */
249 NULL, /* tls_require_ciphers */
250 NULL, /* gnutls_require_kx */
251 NULL, /* gnutls_require_mac */
252 NULL, /* gnutls_require_proto */
254 NULL, /* tls_verify_certificates */
255 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
256 /* tls_dh_min_bits */
257 TRUE, /* tls_tempfail_tryclear */
258 NULL, /* tls_verify_hosts */
259 NULL /* tls_try_verify_hosts */
260 # ifdef EXPERIMENTAL_CERTNAMES
261 ,NULL /* tls_verify_cert_hostnames */
265 ,NULL, /* dkim_canon */
266 NULL, /* dkim_domain */
267 NULL, /* dkim_private_key */
268 NULL, /* dkim_selector */
269 NULL, /* dkim_sign_headers */
270 NULL /* dkim_strict */
274 #ifdef EXPERIMENTAL_DSN
275 /* some DSN flags for use later */
277 static int rf_list[] = {rf_notify_never, rf_notify_success,
278 rf_notify_failure, rf_notify_delay };
280 static uschar *rf_names[] = { "NEVER", "SUCCESS", "FAILURE", "DELAY" };
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static BOOL update_waiting; /* TRUE to update the "wait" database */
292 /*************************************************
293 * Setup entry point *
294 *************************************************/
296 /* This function is called when the transport is about to be used,
297 but before running it in a sub-process. It is used for two things:
299 (1) To set the fallback host list in addresses, when delivering.
300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
309 errmsg place for error message (not used)
311 Returns: OK always (FAIL, DEFER not used)
315 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
318 smtp_transport_options_block *ob =
319 (smtp_transport_options_block *)(tblock->options_block);
321 errmsg = errmsg; /* Keep picky compilers happy */
325 /* Pass back options if required. This interface is getting very messy. */
329 tf->interface = ob->interface;
331 tf->protocol = ob->protocol;
332 tf->hosts = ob->hosts;
333 tf->hosts_override = ob->hosts_override;
334 tf->hosts_randomize = ob->hosts_randomize;
335 tf->gethostbyname = ob->gethostbyname;
336 tf->qualify_single = ob->dns_qualify_single;
337 tf->search_parents = ob->dns_search_parents;
338 tf->helo_data = ob->helo_data;
341 /* Set the fallback host list for all the addresses that don't have fallback
342 host lists, provided that the local host wasn't present in the original host
345 if (!testflag(addrlist, af_local_host_removed))
347 for (; addrlist != NULL; addrlist = addrlist->next)
348 if (addrlist->fallback_hosts == NULL)
349 addrlist->fallback_hosts = ob->fallback_hostlist;
357 /*************************************************
358 * Initialization entry point *
359 *************************************************/
361 /* Called for each instance, after its options have been read, to
362 enable consistency checks to be done, or anything else that needs
365 Argument: pointer to the transport instance block
370 smtp_transport_init(transport_instance *tblock)
372 smtp_transport_options_block *ob =
373 (smtp_transport_options_block *)(tblock->options_block);
375 /* Retry_use_local_part defaults FALSE if unset */
377 if (tblock->retry_use_local_part == TRUE_UNSET)
378 tblock->retry_use_local_part = FALSE;
380 /* Set the default port according to the protocol */
382 if (ob->port == NULL)
383 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
384 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
386 /* Set up the setup entry point, to be called before subprocesses for this
389 tblock->setup = smtp_transport_setup;
391 /* Complain if any of the timeouts are zero. */
393 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
394 ob->final_timeout <= 0)
395 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
396 "command, data, or final timeout value is zero for %s transport",
399 /* If hosts_override is set and there are local hosts, set the global
400 flag that stops verify from showing router hosts. */
402 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404 /* If there are any fallback hosts listed, build a chain of host items
405 for them, but do not do any lookups at this time. */
407 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
410 if ( ob->gnutls_require_kx
411 || ob->gnutls_require_mac
412 || ob->gnutls_require_proto)
413 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
414 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
423 /*************************************************
424 * Set delivery info into all active addresses *
425 *************************************************/
427 /* Only addresses whose status is >= PENDING are relevant. A lesser
428 status means that an address is not currently being processed.
431 addrlist points to a chain of addresses
432 errno_value to put in each address's errno field
433 msg to put in each address's message field
434 rc to put in each address's transport_return field
435 pass_message if TRUE, set the "pass message" flag in the address
437 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
438 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
439 this particular type of timeout.
445 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
450 if (errno_value == ERRNO_CONNECTTIMEOUT)
452 errno_value = ETIMEDOUT;
453 orvalue = RTEF_CTOUT;
455 for (addr = addrlist; addr != NULL; addr = addr->next)
457 if (addr->transport_return < PENDING) continue;
458 addr->basic_errno = errno_value;
459 addr->more_errno |= orvalue;
463 if (pass_message) setflag(addr, af_pass_message);
465 addr->transport_return = rc;
471 /*************************************************
472 * Check an SMTP response *
473 *************************************************/
475 /* This function is given an errno code and the SMTP response buffer
476 to analyse, together with the host identification for generating messages. It
477 sets an appropriate message and puts the first digit of the response code into
478 the yield variable. If no response was actually read, a suitable digit is
482 host the current host, to get its name for messages
483 errno_value pointer to the errno value
484 more_errno from the top address for use with ERRNO_FILTER_FAIL
485 buffer the SMTP response buffer
486 yield where to put a one-digit SMTP response code
487 message where to put an errror message
488 pass_message set TRUE if message is an SMTP response
490 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
494 check_response(host_item *host, int *errno_value, int more_errno,
495 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
499 if (smtp_use_pipelining &&
500 (Ustrcmp(smtp_command, "MAIL") == 0 ||
501 Ustrcmp(smtp_command, "RCPT") == 0 ||
502 Ustrcmp(smtp_command, "DATA") == 0))
505 *yield = '4'; /* Default setting is to give a temporary error */
507 /* Handle response timeout */
509 if (*errno_value == ETIMEDOUT)
511 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
512 "after %s%s", host->name, host->address, pl, smtp_command);
513 if (transport_count > 0)
514 *message = US string_sprintf("%s (%d bytes written)", *message,
519 /* Handle malformed SMTP response */
521 if (*errno_value == ERRNO_SMTPFORMAT)
523 uschar *malfresp = string_printing(buffer);
524 while (isspace(*malfresp)) malfresp++;
526 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
527 "%s [%s] in response to %s%s", host->name, host->address, pl,
530 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
531 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
535 /* Handle a failed filter process error; can't send QUIT as we mustn't
538 if (*errno_value == ERRNO_FILTER_FAIL)
540 *message = US string_sprintf("transport filter process failed (%d)%s",
542 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
546 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
549 if (*errno_value == ERRNO_CHHEADER_FAIL)
552 US string_sprintf("failed to expand headers_add or headers_remove: %s",
553 expand_string_message);
557 /* Handle failure to write a complete data block */
559 if (*errno_value == ERRNO_WRITEINCOMPLETE)
561 *message = US string_sprintf("failed to write a data block");
565 /* Handle error responses from the remote mailer. */
569 uschar *s = string_printing(buffer);
570 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
571 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
572 *pass_message = TRUE;
577 /* No data was read. If there is no errno, this must be the EOF (i.e.
578 connection closed) case, which causes deferral. An explicit connection reset
579 error has the same effect. Otherwise, put the host's identity in the message,
580 leaving the errno value to be interpreted as well. In all cases, we have to
581 assume the connection is now dead. */
583 if (*errno_value == 0 || *errno_value == ECONNRESET)
585 *errno_value = ERRNO_SMTPCLOSED;
586 *message = US string_sprintf("Remote host %s [%s] closed connection "
587 "in response to %s%s", host->name, host->address, pl, smtp_command);
589 else *message = US string_sprintf("%s [%s]", host->name, host->address);
596 /*************************************************
597 * Write error message to logs *
598 *************************************************/
600 /* This writes to the main log and to the message log.
603 addr the address item containing error information
604 host the current host
610 write_logs(address_item *addr, host_item *host)
612 if (addr->message != NULL)
614 uschar *message = addr->message;
615 if (addr->basic_errno > 0)
616 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
617 log_write(0, LOG_MAIN, "%s", message);
618 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
623 ((log_extra_selector & LX_outgoing_port) != 0)?
624 string_sprintf("%s [%s]:%d", host->name, host->address,
625 (host->port == PORT_NONE)? 25 : host->port)
627 string_sprintf("%s [%s]", host->name, host->address);
628 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
629 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
630 strerror(addr->basic_errno));
636 #ifdef EXPERIMENTAL_TPDA
637 /*************************************************
638 * Post-defer action *
639 *************************************************/
641 /* This expands an arbitrary per-transport string.
642 It might, for example, be used to write to the database log.
645 addr the address item containing error information
646 host the current host
652 tpda_deferred(address_item *addr, host_item *host)
654 uschar * action = addr->transport->tpda_event_action;
655 uschar * save_domain;
661 save_domain = deliver_domain;
662 save_local = deliver_localpart;
664 /*XXX would ip & port already be set up? */
665 deliver_host_address = string_copy(host->address);
666 deliver_host_port = (host->port == PORT_NONE)? 25 : host->port;
667 tpda_defer_errno = addr->basic_errno;
669 router_name = addr->router->name;
670 transport_name = addr->transport->name;
671 deliver_domain = addr->domain;
672 deliver_localpart = addr->local_part;
674 (void) tpda_raise_event(action, US"msg:host:defer",
676 ? addr->basic_errno > 0
677 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
678 : string_copy(addr->message)
679 : addr->basic_errno > 0
680 ? string_copy(US strerror(addr->basic_errno))
683 deliver_localpart = save_local;
684 deliver_domain = save_domain;
685 router_name = transport_name = NULL;
691 /*************************************************
692 * Synchronize SMTP responses *
693 *************************************************/
695 /* This function is called from smtp_deliver() to receive SMTP responses from
696 the server, and match them up with the commands to which they relate. When
697 PIPELINING is not in use, this function is called after every command, and is
698 therefore somewhat over-engineered, but it is simpler to use a single scheme
699 that works both with and without PIPELINING instead of having two separate sets
702 The set of commands that are buffered up with pipelining may start with MAIL
703 and may end with DATA; in between are RCPT commands that correspond to the
704 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
705 etc.) are never buffered.
707 Errors after MAIL or DATA abort the whole process leaving the response in the
708 buffer. After MAIL, pending responses are flushed, and the original command is
709 re-instated in big_buffer for error messages. For RCPT commands, the remote is
710 permitted to reject some recipient addresses while accepting others. However
711 certain errors clearly abort the whole process. Set the value in
712 transport_return to PENDING_OK if the address is accepted. If there is a
713 subsequent general error, it will get reset accordingly. If not, it will get
714 converted to OK at the end.
717 addrlist the complete address list
718 include_affixes TRUE if affixes include in RCPT
719 sync_addr ptr to the ptr of the one to start scanning at (updated)
720 host the host we are connected to
721 count the number of responses to read
723 include_sender true if 4xx retry is to include the sender it its key
724 pending_MAIL true if the first response is for MAIL
725 pending_DATA 0 if last command sent was not DATA
726 +1 if previously had a good recipient
727 -1 if not previously had a good recipient
728 inblock incoming SMTP block
729 timeout timeout value
730 buffer buffer for reading response
731 buffsize size of buffer
733 Returns: 3 if at least one address had 2xx and one had 5xx
734 2 if at least one address had 5xx but none had 2xx
735 1 if at least one host had a 2xx response, but none had 5xx
736 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
737 -1 timeout while reading RCPT response
738 -2 I/O or other non-response error for RCPT
739 -3 DATA or MAIL failed - errno and buffer set
743 sync_responses(address_item *addrlist, BOOL include_affixes,
744 address_item **sync_addr, host_item *host, int count,
745 BOOL address_retry_include_sender, BOOL pending_MAIL,
746 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
749 address_item *addr = *sync_addr;
752 /* Handle the response for a MAIL command. On error, reinstate the original
753 command in big_buffer for error message use, and flush any further pending
754 responses before returning, except after I/O errors and timeouts. */
759 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
761 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
762 if (errno == 0 && buffer[0] != 0)
764 uschar flushbuffer[4096];
766 if (buffer[0] == '4')
768 save_errno = ERRNO_MAIL4XX;
769 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
773 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
775 && (errno != 0 || flushbuffer[0] == 0))
784 if (pending_DATA) count--; /* Number of RCPT responses to come */
786 /* Read and handle the required number of RCPT responses, matching each one up
787 with an address by scanning for the next address whose status is PENDING_DEFER.
792 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
794 /* The address was accepted */
796 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
799 addr->transport_return = PENDING_OK;
801 /* If af_dr_retry_exists is set, there was a routing delay on this address;
802 ensure that any address-specific retry record is expunged. We do this both
803 for the basic key and for the version that also includes the sender. */
805 if (testflag(addr, af_dr_retry_exists))
807 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
809 retry_add_item(addr, altkey, rf_delete);
810 retry_add_item(addr, addr->address_retry_key, rf_delete);
814 /* Timeout while reading the response */
816 else if (errno == ETIMEDOUT)
818 int save_errno = errno;
819 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
820 "after RCPT TO:<%s>", host->name, host->address,
821 transport_rcpt_address(addr, include_affixes));
822 set_errno(addrlist, save_errno, message, DEFER, FALSE);
823 retry_add_item(addr, addr->address_retry_key, 0);
824 update_waiting = FALSE;
828 /* Handle other errors in obtaining an SMTP response by returning -1. This
829 will cause all the addresses to be deferred. Restore the SMTP command in
830 big_buffer for which we are checking the response, so the error message
833 else if (errno != 0 || buffer[0] == 0)
835 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
836 transport_rcpt_address(addr, include_affixes));
840 /* Handle SMTP permanent and temporary response codes. */
845 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
846 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
847 host->name, host->address, string_printing(buffer));
848 setflag(addr, af_pass_message);
849 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
851 /* The response was 5xx */
853 if (buffer[0] == '5')
855 addr->transport_return = FAIL;
859 /* The response was 4xx */
863 addr->transport_return = DEFER;
864 addr->basic_errno = ERRNO_RCPT4XX;
865 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
867 /* Log temporary errors if there are more hosts to be tried. */
869 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
871 /* Do not put this message on the list of those waiting for specific
872 hosts, as otherwise it is likely to be tried too often. */
874 update_waiting = FALSE;
876 /* Add a retry item for the address so that it doesn't get tried again
877 too soon. If address_retry_include_sender is true, add the sender address
880 if (address_retry_include_sender)
882 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
884 retry_add_item(addr, altkey, 0);
886 else retry_add_item(addr, addr->address_retry_key, 0);
889 } /* Loop for next RCPT response */
891 /* Update where to start at for the next block of responses, unless we
892 have already handled all the addresses. */
894 if (addr != NULL) *sync_addr = addr->next;
896 /* Handle a response to DATA. If we have not had any good recipients, either
897 previously or in this block, the response is ignored. */
899 if (pending_DATA != 0 &&
900 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
905 if (pending_DATA > 0 || (yield & 1) != 0)
907 if (errno == 0 && buffer[0] == '4')
909 errno = ERRNO_DATA4XX;
910 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
914 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
915 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
916 "is in use and there were no good recipients\n", msg);
919 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
920 present) received 3xx. If any RCPTs were handled and yielded anything other
921 than 4xx, yield will be set non-zero. */
928 /* Do the client side of smtp-level authentication */
931 buffer EHLO response from server (gets overwritten)
932 addrlist chain of potential addresses to deliver
933 host host to deliver to
935 ibp, obp comms channel control blocks
938 OK Success, or failed (but not required): global "smtp_authenticated" set
939 DEFER Failed authentication (and was required)
940 ERROR Internal problem
942 FAIL_SEND Failed communications - transmit
947 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
948 smtp_transport_options_block *ob, BOOL is_esmtp,
949 smtp_inblock *ibp, smtp_outblock *obp)
952 uschar *fail_reason = US"server did not advertise AUTH support";
954 smtp_authenticated = FALSE;
955 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
956 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
957 host->name, host->address, NULL);
959 if (is_esmtp && !regex_AUTH) regex_AUTH =
960 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
963 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
965 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
966 expand_nmax = -1; /* reset */
968 /* Must not do this check until after we have saved the result of the
969 regex match above. */
971 if (require_auth == OK ||
972 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
973 host->address, NULL) == OK)
976 fail_reason = US"no common mechanisms were found";
978 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
980 /* Scan the configured authenticators looking for one which is configured
981 for use as a client, which is not suppressed by client_condition, and
982 whose name matches an authentication mechanism supported by the server.
983 If one is found, attempt to authenticate by calling its client function.
986 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
990 (au->client_condition != NULL &&
991 !expand_check_condition(au->client_condition, au->name,
992 US"client authenticator")))
994 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
996 (au->client)? "client_condition is false" :
997 "not configured as a client");
1001 /* Loop to scan supported server mechanisms */
1006 int len = Ustrlen(au->public_name);
1007 while (isspace(*p)) p++;
1009 if (strncmpic(au->public_name, p, len) != 0 ||
1010 (p[len] != 0 && !isspace(p[len])))
1012 while (*p != 0 && !isspace(*p)) p++;
1016 /* Found data for a listed mechanism. Call its client entry. Set
1017 a flag in the outblock so that data is overwritten after sending so
1018 that reflections don't show it. */
1020 fail_reason = US"authentication attempt(s) failed";
1021 obp->authenticating = TRUE;
1022 rc = (au->info->clientcode)(au, ibp, obp,
1023 ob->command_timeout, buffer, bufsize);
1024 obp->authenticating = FALSE;
1025 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1028 /* A temporary authentication failure must hold up delivery to
1029 this host. After a permanent authentication failure, we carry on
1030 to try other authentication methods. If all fail hard, try to
1031 deliver the message unauthenticated unless require_auth was set. */
1036 smtp_authenticated = TRUE; /* stops the outer loop */
1037 client_authenticator = au->name;
1038 if (au->set_client_id != NULL)
1039 client_authenticated_id = expand_string(au->set_client_id);
1042 /* Failure after writing a command */
1047 /* Failure after reading a response */
1050 if (errno != 0 || buffer[0] != '5') return FAIL;
1051 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1052 au->name, host->name, host->address, buffer);
1055 /* Failure by some other means. In effect, the authenticator
1056 decided it wasn't prepared to handle this case. Typically this
1057 is the result of "fail" in an expansion string. Do we need to
1058 log anything here? Feb 2006: a message is now put in the buffer
1059 if logging is required. */
1063 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1064 "authentication H=%s [%s] %s", au->name, host->name,
1065 host->address, buffer);
1068 /* Internal problem, message in buffer. */
1071 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1075 break; /* If not authenticated, try next authenticator */
1076 } /* Loop for scanning supported server mechanisms */
1077 } /* Loop for further authenticators */
1081 /* If we haven't authenticated, but are required to, give up. */
1083 if (require_auth == OK && !smtp_authenticated)
1085 set_errno(addrlist, ERRNO_AUTHFAIL,
1086 string_sprintf("authentication required but %s", fail_reason), DEFER,
1095 /* Construct AUTH appendix string for MAIL TO */
1098 buffer to build string
1099 addrlist chain of potential addresses to deliver
1100 ob transport options
1102 Globals smtp_authenticated
1103 client_authenticated_sender
1104 Return True on error, otherwise buffer has (possibly empty) terminated string
1108 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1109 smtp_transport_options_block *ob)
1111 uschar *local_authenticated_sender = authenticated_sender;
1114 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1117 if (ob->authenticated_sender != NULL)
1119 uschar *new = expand_string(ob->authenticated_sender);
1122 if (!expand_string_forcedfail)
1124 uschar *message = string_sprintf("failed to expand "
1125 "authenticated_sender: %s", expand_string_message);
1126 set_errno(addrlist, 0, message, DEFER, FALSE);
1130 else if (new[0] != 0) local_authenticated_sender = new;
1133 /* Add the authenticated sender address if present */
1135 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1136 local_authenticated_sender != NULL)
1138 string_format(buffer, bufsize, " AUTH=%s",
1139 auth_xtextencode(local_authenticated_sender,
1140 Ustrlen(local_authenticated_sender)));
1141 client_authenticated_sender = string_copy(local_authenticated_sender);
1151 /*************************************************
1152 * Deliver address list to given host *
1153 *************************************************/
1155 /* If continue_hostname is not null, we get here only when continuing to
1156 deliver down an existing channel. The channel was passed as the standard
1157 input. TLS is never active on a passed channel; the previous process always
1158 closes it down before passing the connection on.
1160 Otherwise, we have to make a connection to the remote host, and do the
1161 initial protocol exchange.
1163 When running as an MUA wrapper, if the sender or any recipient is rejected,
1164 temporarily or permanently, we force failure for all recipients.
1167 addrlist chain of potential addresses to deliver; only those whose
1168 transport_return field is set to PENDING_DEFER are currently
1169 being processed; others should be skipped - they have either
1170 been delivered to an earlier host or IP address, or been
1171 failed by one of them.
1172 host host to deliver to
1173 host_af AF_INET or AF_INET6
1174 port default TCP/IP port to use, in host byte order
1175 interface interface to bind to, or NULL
1176 tblock transport instance block
1177 copy_host TRUE if host set in addr->host_used must be copied, because
1178 it is specific to this call of the transport
1179 message_defer set TRUE if yield is OK, but all addresses were deferred
1180 because of a non-recipient, non-host failure, that is, a
1181 4xx response to MAIL FROM, DATA, or ".". This is a defer
1182 that is specific to the message.
1183 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1184 a second attempt after TLS initialization fails
1186 Returns: OK - the connection was made and the delivery attempted;
1187 the result for each address is in its data block.
1188 DEFER - the connection could not be made, or something failed
1189 while setting up the SMTP session, or there was a
1190 non-message-specific error, such as a timeout.
1191 ERROR - a filter command is specified for this transport,
1192 and there was a problem setting it up; OR helo_data
1193 or add_headers or authenticated_sender is specified
1194 for this transport, and the string failed to expand
1198 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1199 uschar *interface, transport_instance *tblock, BOOL copy_host,
1200 BOOL *message_defer, BOOL suppress_tls)
1203 address_item *sync_addr;
1204 address_item *first_addr = addrlist;
1209 time_t start_delivery_time = time(NULL);
1210 smtp_transport_options_block *ob =
1211 (smtp_transport_options_block *)(tblock->options_block);
1212 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1213 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1215 BOOL send_rset = TRUE;
1216 BOOL send_quit = TRUE;
1217 BOOL setting_up = TRUE;
1218 BOOL completed_address = FALSE;
1221 BOOL pass_message = FALSE;
1222 #ifndef DISABLE_PRDR
1223 BOOL prdr_offered = FALSE;
1226 #ifdef EXPERIMENTAL_DSN
1227 BOOL dsn_all_lasthop = TRUE;
1229 smtp_inblock inblock;
1230 smtp_outblock outblock;
1231 int max_rcpt = tblock->max_addresses;
1232 uschar *igquotstr = US"";
1233 uschar *helo_data = NULL;
1234 uschar *message = NULL;
1235 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1237 uschar buffer[4096];
1238 uschar inbuffer[4096];
1239 uschar outbuffer[4096];
1241 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1243 *message_defer = FALSE;
1244 smtp_command = US"initial connection";
1245 if (max_rcpt == 0) max_rcpt = 999999;
1247 /* Set up the buffer for reading SMTP response packets. */
1249 inblock.buffer = inbuffer;
1250 inblock.buffersize = sizeof(inbuffer);
1251 inblock.ptr = inbuffer;
1252 inblock.ptrend = inbuffer;
1254 /* Set up the buffer for holding SMTP commands while pipelining */
1256 outblock.buffer = outbuffer;
1257 outblock.buffersize = sizeof(outbuffer);
1258 outblock.ptr = outbuffer;
1259 outblock.cmd_count = 0;
1260 outblock.authenticating = FALSE;
1262 /* Reset the parameters of a TLS session. */
1265 tls_out.cipher = NULL; /* the one we may use for this transport */
1266 tls_out.ourcert = NULL;
1267 tls_out.peercert = NULL;
1268 tls_out.peerdn = NULL;
1269 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1272 tls_out.ocsp = OCSP_NOT_REQ;
1274 /* Flip the legacy TLS-related variables over to the outbound set in case
1275 they're used in the context of the transport. Don't bother resetting
1276 afterward as we're in a subprocess. */
1278 tls_modify_variables(&tls_out);
1283 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1288 /* Make a connection to the host if this isn't a continued delivery, and handle
1289 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1290 specially so they can be identified for retries. */
1292 if (continue_hostname == NULL)
1294 /* This puts port into host->port */
1295 inblock.sock = outblock.sock =
1296 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1297 ob->keepalive, ob->dscp
1298 #ifdef EXPERIMENTAL_TPDA
1299 , tblock->tpda_event_action
1303 if (inblock.sock < 0)
1305 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1306 NULL, DEFER, FALSE);
1310 /* Expand the greeting message while waiting for the initial response. (Makes
1311 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1312 delayed till here so that $sending_interface and $sending_port are set. */
1314 helo_data = expand_string(ob->helo_data);
1316 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1317 is nevertheless a reasonably clean way of programming this kind of logic,
1318 where you want to escape on any error. */
1322 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1323 ob->command_timeout)) goto RESPONSE_FAILED;
1325 #ifdef EXPERIMENTAL_TPDA
1326 if (tpda_raise_event(tblock->tpda_event_action, US"smtp:connect", buffer)
1329 uschar *message = US"deferred by smtp:connect event expansion";
1330 set_errno(addrlist, 0, message, DEFER, FALSE);
1336 /* Now check if the helo_data expansion went well, and sign off cleanly if
1339 if (helo_data == NULL)
1341 uschar *message = string_sprintf("failed to expand helo_data: %s",
1342 expand_string_message);
1343 set_errno(addrlist, 0, message, DEFER, FALSE);
1349 /** Debugging without sending a message
1350 addrlist->transport_return = DEFER;
1354 /* Errors that occur after this point follow an SMTP command, which is
1355 left in big_buffer by smtp_write_command() for use in error messages. */
1357 smtp_command = big_buffer;
1359 /* Tell the remote who we are...
1361 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1362 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1363 greeting is of this form. The assumption was that the far end supports it
1364 properly... but experience shows that there are some that give 5xx responses,
1365 even though the banner includes "ESMTP" (there's a bloody-minded one that
1366 says "ESMTP not spoken here"). Cope with that case.
1368 September 2000: Time has passed, and it seems reasonable now to always send
1369 EHLO at the start. It is also convenient to make the change while installing
1372 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1373 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1374 would be no way to send out the mails, so there is now a host list
1375 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1376 PIPELINING problem as well. Maybe it can also be useful to cure other
1377 problems with broken servers.
1379 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1380 Then somebody tried it with a Microsoft mailer... It seems that all other
1381 mailers use upper case for some reason (the RFC is quite clear about case
1382 independence) so, for peace of mind, I gave in. */
1384 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1385 host->name, host->address, NULL) != OK;
1387 /* Alas; be careful, since this goto is not an error-out, so conceivably
1388 we might set data between here and the target which we assume to exist
1389 and be usable. I can see this coming back to bite us. */
1394 suppress_tls = FALSE;
1395 ob->tls_tempfail_tryclear = FALSE;
1396 smtp_command = US"SSL-on-connect";
1403 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1404 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1406 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1407 ob->command_timeout))
1409 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1416 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1421 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1423 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1424 ob->command_timeout)) goto RESPONSE_FAILED;
1427 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1428 lmtp_ignore_quota option was set. */
1430 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1431 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1432 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1434 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1437 tls_offered = esmtp &&
1438 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1439 PCRE_EOPT, NULL, 0) >= 0;
1442 #ifndef DISABLE_PRDR
1443 prdr_offered = esmtp &&
1444 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1445 PCRE_EOPT, NULL, 0) >= 0) &&
1446 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1447 host->address, NULL) == OK);
1450 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1454 /* For continuing deliveries down the same channel, the socket is the standard
1455 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1456 below). Set up the pointer to where subsequent commands will be left, for
1457 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1458 set from the command line if they were set in the process that passed the
1463 inblock.sock = outblock.sock = fileno(stdin);
1464 smtp_command = big_buffer;
1465 host->port = port; /* Record the port that was used */
1468 /* If TLS is available on this connection, whether continued or not, attempt to
1469 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1470 send another EHLO - the server may give a different answer in secure mode. We
1471 use a separate buffer for reading the response to STARTTLS so that if it is
1472 negative, the original EHLO data is available for subsequent analysis, should
1473 the client not be required to use TLS. If the response is bad, copy the buffer
1474 for error analysis. */
1477 if (tls_offered && !suppress_tls &&
1478 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1479 host->address, NULL) != OK)
1481 uschar buffer2[4096];
1482 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1485 /* If there is an I/O error, transmission of this message is deferred. If
1486 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1487 false, we also defer. However, if there is a temporary rejection of STARTTLS
1488 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1489 STARTTLS, we carry on. This means we will try to send the message in clear,
1490 unless the host is in hosts_require_tls (tested below). */
1492 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1493 ob->command_timeout))
1495 if (errno != 0 || buffer2[0] == 0 ||
1496 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1498 Ustrncpy(buffer, buffer2, sizeof(buffer));
1499 goto RESPONSE_FAILED;
1503 /* STARTTLS accepted: try to negotiate a TLS session. */
1508 int rc = tls_client_start(inblock.sock, host, addrlist, tblock);
1510 /* TLS negotiation failed; give an error. From outside, this function may
1511 be called again to try in clear on a new connection, if the options permit
1512 it for this host. */
1516 save_errno = ERRNO_TLSFAILURE;
1517 message = US"failure while setting up TLS session";
1522 /* TLS session is set up */
1524 for (addr = addrlist; addr != NULL; addr = addr->next)
1526 if (addr->transport_return == PENDING_DEFER)
1528 addr->cipher = tls_out.cipher;
1529 addr->ourcert = tls_out.ourcert;
1530 addr->peercert = tls_out.peercert;
1531 addr->peerdn = tls_out.peerdn;
1532 addr->ocsp = tls_out.ocsp;
1538 /* if smtps, we'll have smtp_command set to something else; always safe to
1540 smtp_command = big_buffer;
1542 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1543 helo_data is null, we are dealing with a connection that was passed from
1544 another process, and so we won't have expanded helo_data above. We have to
1545 expand it here. $sending_ip_address and $sending_port are set up right at the
1546 start of the Exim process (in exim.c). */
1548 if (tls_out.active >= 0)
1551 if (helo_data == NULL)
1553 helo_data = expand_string(ob->helo_data);
1554 if (helo_data == NULL)
1556 uschar *message = string_sprintf("failed to expand helo_data: %s",
1557 expand_string_message);
1558 set_errno(addrlist, 0, message, DEFER, FALSE);
1564 /* For SMTPS we need to wait for the initial OK response. */
1567 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1568 ob->command_timeout)) goto RESPONSE_FAILED;
1572 greeting_cmd = "EHLO";
1575 greeting_cmd = "HELO";
1577 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1580 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1581 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1583 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1584 ob->command_timeout))
1585 goto RESPONSE_FAILED;
1588 /* If the host is required to use a secure channel, ensure that we
1591 else if ( verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1592 host->address, NULL) == OK
1593 #ifdef EXPERIMENTAL_DANE
1594 || verify_check_this_host(&(ob->hosts_require_dane), NULL, host->name,
1595 host->address, NULL) == OK
1599 save_errno = ERRNO_TLSREQUIRED;
1600 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1601 host->name, host->address,
1602 tls_offered? "an attempt to start TLS failed" :
1603 "the server did not offer TLS support");
1608 /* If TLS is active, we have just started it up and re-done the EHLO command,
1609 so its response needs to be analyzed. If TLS is not active and this is a
1610 continued session down a previously-used socket, we haven't just done EHLO, so
1613 if (continue_hostname == NULL
1615 || tls_out.active >= 0
1619 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1620 lmtp_ignore_quota option was set. */
1622 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1623 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1624 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1626 /* If the response to EHLO specified support for the SIZE parameter, note
1627 this, provided size_addition is non-negative. */
1629 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1630 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1631 PCRE_EOPT, NULL, 0) >= 0;
1633 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1634 the current host, esmtp will be false, so PIPELINING can never be used. If
1635 the current host matches hosts_avoid_pipelining, don't do it. */
1637 smtp_use_pipelining = esmtp &&
1638 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1639 host->address, NULL) != OK &&
1640 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1641 PCRE_EOPT, NULL, 0) >= 0;
1643 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1644 smtp_use_pipelining? "" : "not ");
1646 #ifndef DISABLE_PRDR
1647 prdr_offered = esmtp &&
1648 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1649 PCRE_EOPT, NULL, 0) >= 0 &&
1650 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1651 host->address, NULL) == OK;
1654 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1657 #ifdef EXPERIMENTAL_DSN
1658 /* Note if the server supports DSN */
1659 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1660 PCRE_EOPT, NULL, 0) >= 0;
1661 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1664 /* Note if the response to EHLO specifies support for the AUTH extension.
1665 If it has, check that this host is one we want to authenticate to, and do
1666 the business. The host name and address must be available when the
1667 authenticator's client driver is running. */
1669 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1670 ob, esmtp, &inblock, &outblock))
1672 default: goto SEND_QUIT;
1674 case FAIL_SEND: goto SEND_FAILED;
1675 case FAIL: goto RESPONSE_FAILED;
1679 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1680 message-specific. */
1684 /* If there is a filter command specified for this transport, we can now
1685 set it up. This cannot be done until the identify of the host is known. */
1687 if (tblock->filter_command != NULL)
1691 sprintf(CS buffer, "%.50s transport", tblock->name);
1692 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1693 TRUE, DEFER, addrlist, buffer, NULL);
1694 transport_filter_timeout = tblock->filter_timeout;
1696 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1701 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1709 /* For messages that have more than the maximum number of envelope recipients,
1710 we want to send several transactions down the same SMTP connection. (See
1711 comments in deliver.c as to how this reconciles, heuristically, with
1712 remote_max_parallel.) This optimization was added to Exim after the following
1713 code was already working. The simplest way to put it in without disturbing the
1714 code was to use a goto to jump back to this point when there is another
1715 transaction to handle. */
1718 sync_addr = first_addr;
1722 completed_address = FALSE;
1725 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1726 qualification, send it, adding something to the message size to allow for
1727 imprecision and things that get added en route. Exim keeps the number of lines
1728 in a message, so we can give an accurate value for the original message, but we
1729 need some additional to handle added headers. (Double "." characters don't get
1730 included in the count.) */
1737 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1741 #ifndef DISABLE_PRDR
1742 prdr_active = FALSE;
1745 for (addr = first_addr; addr; addr = addr->next)
1746 if (addr->transport_return == PENDING_DEFER)
1748 for (addr = addr->next; addr; addr = addr->next)
1749 if (addr->transport_return == PENDING_DEFER)
1750 { /* at least two recipients to send */
1752 sprintf(CS p, " PRDR"); p += 5;
1760 #ifdef EXPERIMENTAL_DSN
1761 /* check if all addresses have lasthop flag */
1762 /* do not send RET and ENVID if true */
1763 dsn_all_lasthop = TRUE;
1764 for (addr = first_addr;
1765 address_count < max_rcpt && addr != NULL;
1767 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1768 dsn_all_lasthop = FALSE;
1770 /* Add any DSN flags to the mail command */
1772 if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1774 if (dsn_ret == dsn_ret_hdrs)
1776 strcpy(p, " RET=HDRS");
1779 else if (dsn_ret == dsn_ret_full)
1781 strcpy(p, " RET=FULL");
1784 if (dsn_envid != NULL)
1786 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1792 /* If an authenticated_sender override has been specified for this transport
1793 instance, expand it. If the expansion is forced to fail, and there was already
1794 an authenticated_sender for this message, the original value will be used.
1795 Other expansion failures are serious. An empty result is ignored, but there is
1796 otherwise no check - this feature is expected to be used with LMTP and other
1797 cases where non-standard addresses (e.g. without domains) might be required. */
1799 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1805 /* From here until we send the DATA command, we can make use of PIPELINING
1806 if the server host supports it. The code has to be able to check the responses
1807 at any point, for when the buffer fills up, so we write it totally generally.
1808 When PIPELINING is off, each command written reports that it has flushed the
1811 pending_MAIL = TRUE; /* The block starts with MAIL */
1813 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1814 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1815 mail_command = string_copy(big_buffer); /* Save for later error message */
1819 case -1: /* Transmission error */
1822 case +1: /* Block was sent */
1823 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1824 ob->command_timeout))
1826 if (errno == 0 && buffer[0] == '4')
1828 errno = ERRNO_MAIL4XX;
1829 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1831 goto RESPONSE_FAILED;
1833 pending_MAIL = FALSE;
1837 /* Pass over all the relevant recipient addresses for this host, which are the
1838 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1839 several before we have to read the responses for those seen so far. This
1840 checking is done by a subroutine because it also needs to be done at the end.
1841 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1842 the next one if not all are sent.
1844 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1845 last address because we want to abort if any recipients have any kind of
1846 problem, temporary or permanent. We know that all recipient addresses will have
1847 the PENDING_DEFER status, because only one attempt is ever made, and we know
1848 that max_rcpt will be large, so all addresses will be done at once. */
1850 for (addr = first_addr;
1851 address_count < max_rcpt && addr != NULL;
1857 #ifdef EXPERIMENTAL_DSN
1858 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
1861 if (addr->transport_return != PENDING_DEFER) continue;
1864 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1866 #ifdef EXPERIMENTAL_DSN
1867 /* Add any DSN flags to the rcpt command and add to the sent string */
1872 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
1874 if ((addr->dsn_flags & rf_dsnflags) != 0)
1878 strcpy(p, " NOTIFY=");
1880 for (i = 0; i < 4; i++)
1881 if ((addr->dsn_flags & rf_list[i]) != 0)
1883 if (!first) *p++ = ',';
1885 strcpy(p, rf_names[i]);
1890 if (addr->dsn_orcpt != NULL)
1892 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1900 /* Now send the RCPT command, and process outstanding responses when
1901 necessary. After a timeout on RCPT, we just end the function, leaving the
1902 yield as OK, because this error can often mean that there is a problem with
1903 just one address, so we don't want to delay the host. */
1905 #ifdef EXPERIMENTAL_DSN
1906 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1907 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
1909 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1910 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1913 if (count < 0) goto SEND_FAILED;
1916 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1917 &sync_addr, host, count, ob->address_retry_include_sender,
1918 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1921 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1922 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1925 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1926 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1927 case 0: /* No 2xx or 5xx, but no probs */
1930 case -1: goto END_OFF; /* Timeout on RCPT */
1931 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1933 pending_MAIL = FALSE; /* Dealt with MAIL */
1935 } /* Loop for next address */
1937 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1938 permanently or temporarily. We should have flushed and synced after the last
1943 address_item *badaddr;
1944 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1946 if (badaddr->transport_return != PENDING_OK) break;
1948 if (badaddr != NULL)
1950 set_errno(addrlist, 0, badaddr->message, FAIL,
1951 testflag(badaddr, af_pass_message));
1956 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1957 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1958 have a good recipient buffered up if we are pipelining. We don't want to waste
1959 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1960 are pipelining. The responses are all handled by sync_responses(). */
1962 if (ok || (smtp_use_pipelining && !mua_wrapper))
1964 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1965 if (count < 0) goto SEND_FAILED;
1966 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1967 host, count, ob->address_retry_include_sender, pending_MAIL,
1968 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1970 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1971 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1974 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1975 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1976 case 0: break; /* No 2xx or 5xx, but no probs */
1978 case -1: goto END_OFF; /* Timeout on RCPT */
1979 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1983 /* Save the first address of the next batch. */
1987 /* If there were no good recipients (but otherwise there have been no
1988 problems), just set ok TRUE, since we have handled address-specific errors
1989 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1990 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1991 well as body. Set the appropriate timeout value to be used for each chunk.
1992 (Haven't been able to make it work using select() for writing yet.) */
1994 if (!ok) ok = TRUE; else
1996 sigalrm_seen = FALSE;
1997 transport_write_timeout = ob->data_timeout;
1998 smtp_command = US"sending data block"; /* For error messages */
1999 DEBUG(D_transport|D_v)
2000 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2001 transport_count = 0;
2003 #ifndef DISABLE_DKIM
2004 ok = dkim_transport_write_message(addrlist, inblock.sock,
2005 topt_use_crlf | topt_end_dot | topt_escape_headers |
2006 (tblock->body_only? topt_no_headers : 0) |
2007 (tblock->headers_only? topt_no_body : 0) |
2008 (tblock->return_path_add? topt_add_return_path : 0) |
2009 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2010 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2011 0, /* No size limit */
2012 tblock->add_headers, tblock->remove_headers,
2013 US".", US"..", /* Escaping strings */
2014 tblock->rewrite_rules, tblock->rewrite_existflags,
2015 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2016 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2019 ok = transport_write_message(addrlist, inblock.sock,
2020 topt_use_crlf | topt_end_dot | topt_escape_headers |
2021 (tblock->body_only? topt_no_headers : 0) |
2022 (tblock->headers_only? topt_no_body : 0) |
2023 (tblock->return_path_add? topt_add_return_path : 0) |
2024 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2025 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2026 0, /* No size limit */
2027 tblock->add_headers, tblock->remove_headers,
2028 US".", US"..", /* Escaping strings */
2029 tblock->rewrite_rules, tblock->rewrite_existflags);
2032 /* transport_write_message() uses write() because it is called from other
2033 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2034 it can exit with "Broken pipe" as its error. This really means that the
2035 socket got closed at the far end. */
2037 transport_write_timeout = 0; /* for subsequent transports */
2039 /* Failure can either be some kind of I/O disaster (including timeout),
2040 or the failure of a transport filter or the expansion of added headers. */
2044 buffer[0] = 0; /* There hasn't been a response */
2045 goto RESPONSE_FAILED;
2048 /* We used to send the terminating "." explicitly here, but because of
2049 buffering effects at both ends of TCP/IP connections, you don't gain
2050 anything by keeping it separate, so it might as well go in the final
2051 data buffer for efficiency. This is now done by setting the topt_end_dot
2054 smtp_command = US"end of data";
2056 #ifndef DISABLE_PRDR
2057 /* For PRDR we optionally get a partial-responses warning
2058 * followed by the individual responses, before going on with
2059 * the overall response. If we don't get the warning then deal
2060 * with per non-PRDR. */
2063 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2065 if (!ok && errno == 0)
2068 case '2': prdr_active = FALSE;
2071 case '4': errno = ERRNO_DATA4XX;
2072 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2079 /* For non-PRDR SMTP, we now read a single response that applies to the
2080 whole message. If it is OK, then all the addresses have been delivered. */
2084 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2086 if (!ok && errno == 0 && buffer[0] == '4')
2088 errno = ERRNO_DATA4XX;
2089 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2093 /* For LMTP, we get back a response for every RCPT command that we sent;
2094 some may be accepted and some rejected. For those that get a response, their
2095 status is fixed; any that are accepted have been handed over, even if later
2096 responses crash - at least, that's how I read RFC 2033.
2098 If all went well, mark the recipient addresses as completed, record which
2099 host/IPaddress they were delivered to, and cut out RSET when sending another
2100 message down the same channel. Write the completed addresses to the journal
2101 now so that they are recorded in case there is a crash of hardware or
2102 software before the spool gets updated. Also record the final SMTP
2103 confirmation if needed (for SMTP only). */
2108 int delivery_time = (int)(time(NULL) - start_delivery_time);
2111 uschar *conf = NULL;
2114 /* Make a copy of the host if it is local to this invocation
2115 of the transport. */
2119 thost = store_get(sizeof(host_item));
2121 thost->name = string_copy(host->name);
2122 thost->address = string_copy(host->address);
2126 /* Set up confirmation if needed - applies only to SMTP */
2129 #ifndef EXPERIMENTAL_TPDA
2130 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2135 uschar *s = string_printing(buffer);
2136 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2139 /* Process all transported addresses - for LMTP or PRDR, read a status for
2142 for (addr = addrlist; addr != first_addr; addr = addr->next)
2144 if (addr->transport_return != PENDING_OK) continue;
2146 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2147 remaining addresses. Otherwise, it's a return code for just the one
2148 address. For temporary errors, add a retry item for the address so that
2149 it doesn't get tried again too soon. */
2151 #ifndef DISABLE_PRDR
2152 if (lmtp || prdr_active)
2157 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2160 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2161 addr->message = string_sprintf(
2162 #ifndef DISABLE_PRDR
2163 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2165 "LMTP error after %s: %s",
2167 big_buffer, string_printing(buffer));
2168 setflag(addr, af_pass_message); /* Allow message to go to user */
2169 if (buffer[0] == '5')
2170 addr->transport_return = FAIL;
2173 errno = ERRNO_DATA4XX;
2174 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2175 addr->transport_return = DEFER;
2176 #ifndef DISABLE_PRDR
2179 retry_add_item(addr, addr->address_retry_key, 0);
2183 completed_address = TRUE; /* NOW we can set this flag */
2184 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2186 uschar *s = string_printing(buffer);
2187 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2191 /* SMTP, or success return from LMTP for this address. Pass back the
2192 actual host that was used. */
2194 addr->transport_return = OK;
2195 addr->more_errno = delivery_time;
2196 addr->host_used = thost;
2197 addr->special_action = flag;
2198 addr->message = conf;
2199 #ifndef DISABLE_PRDR
2200 if (prdr_active) addr->flags |= af_prdr_used;
2204 #ifndef DISABLE_PRDR
2208 /* Update the journal. For homonymic addresses, use the base address plus
2209 the transport name. See lots of comments in deliver.c about the reasons
2210 for the complications when homonyms are involved. Just carry on after
2211 write error, as it may prove possible to update the spool file later. */
2213 if (testflag(addr, af_homonym))
2214 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2216 sprintf(CS buffer, "%.500s\n", addr->unique);
2218 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2219 len = Ustrlen(CS buffer);
2220 if (write(journal_fd, buffer, len) != len)
2221 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2222 "%s: %s", buffer, strerror(errno));
2226 #ifndef DISABLE_PRDR
2229 /* PRDR - get the final, overall response. For any non-success
2230 upgrade all the address statuses. */
2231 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2235 if(errno == 0 && buffer[0] == '4')
2237 errno = ERRNO_DATA4XX;
2238 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2240 for (addr = addrlist; addr != first_addr; addr = addr->next)
2241 if (buffer[0] == '5' || addr->transport_return == OK)
2242 addr->transport_return = PENDING_OK; /* allow set_errno action */
2243 goto RESPONSE_FAILED;
2246 /* Update the journal, or setup retry. */
2247 for (addr = addrlist; addr != first_addr; addr = addr->next)
2248 if (addr->transport_return == OK)
2250 if (testflag(addr, af_homonym))
2251 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2253 sprintf(CS buffer, "%.500s\n", addr->unique);
2255 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2256 len = Ustrlen(CS buffer);
2257 if (write(journal_fd, buffer, len) != len)
2258 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2259 "%s: %s", buffer, strerror(errno));
2261 else if (addr->transport_return == DEFER)
2262 retry_add_item(addr, addr->address_retry_key, -2);
2266 /* Ensure the journal file is pushed out to disk. */
2268 if (EXIMfsync(journal_fd) < 0)
2269 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2275 /* Handle general (not specific to one address) failures here. The value of ok
2276 is used to skip over this code on the falling through case. A timeout causes a
2277 deferral. Other errors may defer or fail according to the response code, and
2278 may set up a special errno value, e.g. after connection chopped, which is
2279 assumed if errno == 0 and there is no text in the buffer. If control reaches
2280 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2281 the problem is not related to this specific message. */
2290 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2291 buffer, &code, &message, &pass_message);
2297 message = US string_sprintf("send() to %s [%s] failed: %s",
2298 host->name, host->address, strerror(save_errno));
2302 /* This label is jumped to directly when a TLS negotiation has failed,
2303 or was not done for a host for which it is required. Values will be set
2304 in message and save_errno, and setting_up will always be true. Treat as
2305 a temporary error. */
2312 /* If the failure happened while setting up the call, see if the failure was
2313 a 5xx response (this will either be on connection, or following HELO - a 5xx
2314 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2315 never going to accept them. For other errors during setting up (timeouts or
2316 whatever), defer all addresses, and yield DEFER, so that the host is not
2317 tried again for a while. */
2320 ok = FALSE; /* For when reached by GOTO */
2326 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2330 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2335 /* We want to handle timeouts after MAIL or "." and loss of connection after
2336 "." specially. They can indicate a problem with the sender address or with
2337 the contents of the message rather than a real error on the connection. These
2338 cases are treated in the same way as a 4xx response. This next bit of code
2339 does the classification. */
2350 message_error = TRUE;
2354 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2355 Ustrncmp(smtp_command,"end ",4) == 0;
2358 case ERRNO_SMTPCLOSED:
2359 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2363 message_error = FALSE;
2367 /* Handle the cases that are treated as message errors. These are:
2369 (a) negative response or timeout after MAIL
2370 (b) negative response after DATA
2371 (c) negative response or timeout or dropped connection after "."
2373 It won't be a negative response or timeout after RCPT, as that is dealt
2374 with separately above. The action in all cases is to set an appropriate
2375 error code for all the addresses, but to leave yield set to OK because the
2376 host itself has not failed. Of course, it might in practice have failed
2377 when we've had a timeout, but if so, we'll discover that at the next
2378 delivery attempt. For a temporary error, set the message_defer flag, and
2379 write to the logs for information if this is not the last host. The error
2380 for the last host will be logged as part of the address's log line. */
2384 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2385 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2388 /* If there's an errno, the message contains just the identity of
2391 if (code != '5') /* Anything other than 5 is treated as temporary */
2394 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2395 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2396 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2397 *message_defer = TRUE;
2401 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2402 ".", or some other transportation error. We defer all addresses and yield
2403 DEFER, except for the case of failed add_headers expansion, or a transport
2404 filter failure, when the yield should be ERROR, to stop it trying other
2409 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2410 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2411 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2417 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2418 SMTP session tidily. However, if there were too many addresses to send in one
2419 message (indicated by first_addr being non-NULL) we want to carry on with the
2420 rest of them. Also, it is desirable to send more than one message down the SMTP
2421 connection if there are several waiting, provided we haven't already sent so
2422 many as to hit the configured limit. The function transport_check_waiting looks
2423 for a waiting message and returns its id. Then transport_pass_socket tries to
2424 set up a continued delivery by passing the socket on to another process. The
2425 variable send_rset is FALSE if a message has just been successfully transfered.
2427 If we are already sending down a continued channel, there may be further
2428 addresses not yet delivered that are aimed at the same host, but which have not
2429 been passed in this run of the transport. In this case, continue_more will be
2430 true, and all we should do is send RSET if necessary, and return, leaving the
2433 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2434 do not want to continue with other messages down the same channel, because that
2435 can lead to looping between two or more messages, all with the same,
2436 temporarily failing address(es). [The retry information isn't updated yet, so
2437 new processes keep on trying.] We probably also don't want to try more of this
2438 message's addresses either.
2440 If we have started a TLS session, we have to end it before passing the
2441 connection to a new process. However, not all servers can handle this (Exim
2442 can), so we do not pass such a connection on if the host matches
2443 hosts_nopass_tls. */
2446 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2447 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2448 continue_more, yield, (first_addr == NULL)? "":"not ");
2450 if (completed_address && ok && send_quit)
2453 if (first_addr != NULL || continue_more ||
2455 (tls_out.active < 0 ||
2456 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2457 host->address, NULL) != OK)
2459 transport_check_waiting(tblock->name, host->name,
2460 tblock->connection_max_messages, new_message_id, &more)
2468 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2470 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2471 host->address, strerror(save_errno));
2474 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2475 ob->command_timeout)))
2478 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2482 DEBUG(D_transport) debug_printf("%s\n", msg);
2487 /* Either RSET was not needed, or it succeeded */
2491 if (first_addr != NULL) /* More addresses still to be sent */
2492 { /* in this run of the transport */
2493 continue_sequence++; /* Causes * in logging */
2496 if (continue_more) return yield; /* More addresses for another run */
2498 /* Pass the socket to a new Exim process. Before doing so, we must shut
2499 down TLS. Not all MTAs allow for the continuation of the SMTP session
2500 when TLS is shut down. We test for this by sending a new EHLO. If we
2501 don't get a good response, we don't attempt to pass the socket on. */
2504 if (tls_out.active >= 0)
2506 tls_close(FALSE, TRUE);
2510 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2511 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2512 ob->command_timeout);
2516 /* If the socket is successfully passed, we musn't send QUIT (or
2517 indeed anything!) from here. */
2519 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2520 new_message_id, inblock.sock))
2526 /* If RSET failed and there are addresses left, they get deferred. */
2528 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2532 /* End off tidily with QUIT unless the connection has died or the socket has
2533 been passed to another process. There has been discussion on the net about what
2534 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2535 to wait for a response, but on the other hand, there isn't anything one can do
2536 with an error response, other than log it. Exim used to do that. However,
2537 further discussion suggested that it is positively advantageous not to wait for
2538 the response, but to close the session immediately. This is supposed to move
2539 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2540 load from the server. (Hosts that are both servers and clients may not see much
2541 difference, of course.) Further discussion indicated that this was safe to do
2542 on Unix systems which have decent implementations of TCP/IP that leave the
2543 connection around for a while (TIME_WAIT) after the application has gone away.
2544 This enables the response sent by the server to be properly ACKed rather than
2545 timed out, as can happen on broken TCP/IP implementations on other OS.
2547 This change is being made on 31-Jul-98. After over a year of trouble-free
2548 operation, the old commented-out code was removed on 17-Sep-99. */
2551 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2556 tls_close(FALSE, TRUE);
2559 /* Close the socket, and return the appropriate value, first setting
2560 works because the NULL setting is passed back to the calling process, and
2561 remote_max_parallel is forced to 1 when delivering over an existing connection,
2563 If all went well and continue_more is set, we shouldn't actually get here if
2564 there are further addresses, as the return above will be taken. However,
2565 writing RSET might have failed, or there may be other addresses whose hosts are
2566 specified in the transports, and therefore not visible at top level, in which
2567 case continue_more won't get set. */
2569 (void)close(inblock.sock);
2571 #ifdef EXPERIMENTAL_TPDA
2572 (void) tpda_raise_event(tblock->tpda_event_action, US"tcp:close", NULL);
2575 continue_transport = NULL;
2576 continue_hostname = NULL;
2583 /*************************************************
2584 * Closedown entry point *
2585 *************************************************/
2587 /* This function is called when exim is passed an open smtp channel
2588 from another incarnation, but the message which it has been asked
2589 to deliver no longer exists. The channel is on stdin.
2591 We might do fancy things like looking for another message to send down
2592 the channel, but if the one we sought has gone, it has probably been
2593 delivered by some other process that itself will seek further messages,
2594 so just close down our connection.
2596 Argument: pointer to the transport instance block
2601 smtp_transport_closedown(transport_instance *tblock)
2603 smtp_transport_options_block *ob =
2604 (smtp_transport_options_block *)(tblock->options_block);
2605 smtp_inblock inblock;
2606 smtp_outblock outblock;
2608 uschar inbuffer[4096];
2609 uschar outbuffer[16];
2611 inblock.sock = fileno(stdin);
2612 inblock.buffer = inbuffer;
2613 inblock.buffersize = sizeof(inbuffer);
2614 inblock.ptr = inbuffer;
2615 inblock.ptrend = inbuffer;
2617 outblock.sock = inblock.sock;
2618 outblock.buffersize = sizeof(outbuffer);
2619 outblock.buffer = outbuffer;
2620 outblock.ptr = outbuffer;
2621 outblock.cmd_count = 0;
2622 outblock.authenticating = FALSE;
2624 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2625 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2626 ob->command_timeout);
2627 (void)close(inblock.sock);
2632 /*************************************************
2633 * Prepare addresses for delivery *
2634 *************************************************/
2636 /* This function is called to flush out error settings from previous delivery
2637 attempts to other hosts. It also records whether we got here via an MX record
2638 or not in the more_errno field of the address. We are interested only in
2639 addresses that are still marked DEFER - others may have got delivered to a
2640 previously considered IP address. Set their status to PENDING_DEFER to indicate
2641 which ones are relevant this time.
2644 addrlist the list of addresses
2645 host the host we are delivering to
2647 Returns: the first address for this delivery
2650 static address_item *
2651 prepare_addresses(address_item *addrlist, host_item *host)
2653 address_item *first_addr = NULL;
2655 for (addr = addrlist; addr != NULL; addr = addr->next)
2657 if (addr->transport_return != DEFER) continue;
2658 if (first_addr == NULL) first_addr = addr;
2659 addr->transport_return = PENDING_DEFER;
2660 addr->basic_errno = 0;
2661 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2662 addr->message = NULL;
2664 addr->cipher = NULL;
2665 addr->ourcert = NULL;
2666 addr->peercert = NULL;
2667 addr->peerdn = NULL;
2668 addr->ocsp = OCSP_NOT_REQ;
2676 /*************************************************
2677 * Main entry point *
2678 *************************************************/
2680 /* See local README for interface details. As this is a remote transport, it is
2681 given a chain of addresses to be delivered in one connection, if possible. It
2682 always returns TRUE, indicating that each address has its own independent
2683 status set, except if there is a setting up problem, in which case it returns
2687 smtp_transport_entry(
2688 transport_instance *tblock, /* data for this instantiation */
2689 address_item *addrlist) /* addresses we are working on */
2693 int hosts_defer = 0;
2695 int hosts_looked_up = 0;
2696 int hosts_retry = 0;
2697 int hosts_serial = 0;
2698 int hosts_total = 0;
2699 int total_hosts_tried = 0;
2701 BOOL expired = TRUE;
2702 BOOL continuing = continue_hostname != NULL;
2703 uschar *expanded_hosts = NULL;
2705 uschar *tid = string_sprintf("%s transport", tblock->name);
2706 smtp_transport_options_block *ob =
2707 (smtp_transport_options_block *)(tblock->options_block);
2708 host_item *hostlist = addrlist->host_list;
2709 host_item *host = NULL;
2713 debug_printf("%s transport entered\n", tblock->name);
2714 for (addr = addrlist; addr != NULL; addr = addr->next)
2715 debug_printf(" %s\n", addr->address);
2716 if (continuing) debug_printf("already connected to %s [%s]\n",
2717 continue_hostname, continue_host_address);
2720 /* Set the flag requesting that these hosts be added to the waiting
2721 database if the delivery fails temporarily or if we are running with
2722 queue_smtp or a 2-stage queue run. This gets unset for certain
2723 kinds of error, typically those that are specific to the message. */
2725 update_waiting = TRUE;
2727 /* If a host list is not defined for the addresses - they must all have the
2728 same one in order to be passed to a single transport - or if the transport has
2729 a host list with hosts_override set, use the host list supplied with the
2730 transport. It is an error for this not to exist. */
2732 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2734 if (ob->hosts == NULL)
2736 addrlist->message = string_sprintf("%s transport called with no hosts set",
2738 addrlist->transport_return = PANIC;
2739 return FALSE; /* Only top address has status */
2742 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2745 /* If the transport's host list contains no '$' characters, and we are not
2746 randomizing, it is fixed and therefore a chain of hosts can be built once
2747 and for all, and remembered for subsequent use by other calls to this
2748 transport. If, on the other hand, the host list does contain '$', or we are
2749 randomizing its order, we have to rebuild it each time. In the fixed case,
2750 as the hosts string will never be used again, it doesn't matter that we
2751 replace all the : characters with zeros. */
2753 if (ob->hostlist == NULL)
2755 uschar *s = ob->hosts;
2757 if (Ustrchr(s, '$') != NULL)
2759 expanded_hosts = expand_string(s);
2760 if (expanded_hosts == NULL)
2762 addrlist->message = string_sprintf("failed to expand list of hosts "
2763 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2764 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2765 return FALSE; /* Only top address has status */
2767 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2768 "\"%s\"\n", s, expanded_hosts);
2772 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2774 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2776 /* Check that the expansion yielded something useful. */
2777 if (hostlist == NULL)
2780 string_sprintf("%s transport has empty hosts setting", tblock->name);
2781 addrlist->transport_return = PANIC;
2782 return FALSE; /* Only top address has status */
2785 /* If there was no expansion of hosts, save the host list for
2788 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2791 /* This is not the first time this transport has been run in this delivery;
2792 the host list was built previously. */
2794 else hostlist = ob->hostlist;
2797 /* The host list was supplied with the address. If hosts_randomize is set, we
2798 must sort it into a random order if it did not come from MX records and has not
2799 already been randomized (but don't bother if continuing down an existing
2802 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2804 host_item *newlist = NULL;
2805 while (hostlist != NULL)
2807 host_item *h = hostlist;
2808 hostlist = hostlist->next;
2810 h->sort_key = random_number(100);
2812 if (newlist == NULL)
2817 else if (h->sort_key < newlist->sort_key)
2824 host_item *hh = newlist;
2825 while (hh->next != NULL)
2827 if (h->sort_key < hh->next->sort_key) break;
2835 hostlist = addrlist->host_list = newlist;
2839 /* Sort out the default port. */
2841 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2844 /* For each host-plus-IP-address on the list:
2846 . If this is a continued delivery and the host isn't the one with the
2847 current connection, skip.
2849 . If the status is unusable (i.e. previously failed or retry checked), skip.
2851 . If no IP address set, get the address, either by turning the name into
2852 an address, calling gethostbyname if gethostbyname is on, or by calling
2853 the DNS. The DNS may yield multiple addresses, in which case insert the
2854 extra ones into the list.
2856 . Get the retry data if not previously obtained for this address and set the
2857 field which remembers the state of this address. Skip if the retry time is
2858 not reached. If not, remember whether retry data was found. The retry string
2859 contains both the name and the IP address.
2861 . Scan the list of addresses and mark those whose status is DEFER as
2862 PENDING_DEFER. These are the only ones that will be processed in this cycle
2865 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2866 Some addresses may be successfully delivered, others may fail, and yet
2867 others may get temporary errors and so get marked DEFER.
2869 . The return from the delivery attempt is OK if a connection was made and a
2870 valid SMTP dialogue was completed. Otherwise it is DEFER.
2872 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2874 . If fail to connect, or other defer state, add a retry item.
2876 . If there are any addresses whose status is still DEFER, carry on to the
2877 next host/IPaddress, unless we have tried the number of hosts given
2878 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2879 there is some fancy logic for hosts_max_try that means its limit can be
2880 overstepped in some circumstances.
2882 If we get to the end of the list, all hosts have deferred at least one address,
2883 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2884 delivery attempt to those hosts whose last try was before the arrival time of
2885 the current message. To cope with this, we have to go round the loop a second
2886 time. After that, set the status and error data for any addresses that haven't
2887 had it set already. */
2889 for (cutoff_retry = 0; expired &&
2890 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2893 host_item *nexthost = NULL;
2894 int unexpired_hosts_tried = 0;
2896 for (host = hostlist;
2898 unexpired_hosts_tried < ob->hosts_max_try &&
2899 total_hosts_tried < ob->hosts_max_try_hardlimit;
2905 BOOL serialized = FALSE;
2906 BOOL host_is_expired = FALSE;
2907 BOOL message_defer = FALSE;
2908 BOOL ifchanges = FALSE;
2909 BOOL some_deferred = FALSE;
2910 address_item *first_addr = NULL;
2911 uschar *interface = NULL;
2912 uschar *retry_host_key = NULL;
2913 uschar *retry_message_key = NULL;
2914 uschar *serialize_key = NULL;
2916 /* Default next host is next host. :-) But this can vary if the
2917 hosts_max_try limit is hit (see below). It may also be reset if a host
2918 address is looked up here (in case the host was multihomed). */
2920 nexthost = host->next;
2922 /* If the address hasn't yet been obtained from the host name, look it up
2923 now, unless the host is already marked as unusable. If it is marked as
2924 unusable, it means that the router was unable to find its IP address (in
2925 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2926 the lookup failed last time. We don't get this far if *all* MX records
2927 point to non-existent hosts; that is treated as a hard error.
2929 We can just skip this host entirely. When the hosts came from the router,
2930 the address will timeout based on the other host(s); when the address is
2931 looked up below, there is an explicit retry record added.
2933 Note that we mustn't skip unusable hosts if the address is not unset; they
2934 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2936 if (host->address == NULL)
2938 int new_port, flags;
2940 uschar *canonical_name;
2942 if (host->status >= hstatus_unusable)
2944 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2949 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2951 /* The host name is permitted to have an attached port. Find it, and
2952 strip it from the name. Just remember it for now. */
2954 new_port = host_item_get_port(host);
2956 /* Count hosts looked up */
2960 /* Find by name if so configured, or if it's an IP address. We don't
2961 just copy the IP address, because we need the test-for-local to happen. */
2963 flags = HOST_FIND_BY_A;
2964 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2965 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2967 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2968 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2970 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2971 ob->dnssec_request_domains, ob->dnssec_require_domains,
2972 &canonical_name, NULL);
2974 /* Update the host (and any additional blocks, resulting from
2975 multihoming) with a host-specific port, if any. */
2977 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2979 /* Failure to find the host at this time (usually DNS temporary failure)
2980 is really a kind of routing failure rather than a transport failure.
2981 Therefore we add a retry item of the routing kind, not to stop us trying
2982 to look this name up here again, but to ensure the address gets timed
2983 out if the failures go on long enough. A complete failure at this point
2984 commonly points to a configuration error, but the best action is still
2985 to carry on for the next host. */
2987 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2989 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2991 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2992 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2993 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2994 host->status = hstatus_unusable;
2996 for (addr = addrlist; addr != NULL; addr = addr->next)
2998 if (addr->transport_return != DEFER) continue;
2999 addr->basic_errno = ERRNO_UNKNOWNHOST;
3001 string_sprintf("failed to lookup IP address for %s", host->name);
3006 /* If the host is actually the local host, we may have a problem, or
3007 there may be some cunning configuration going on. In the problem case,
3008 log things and give up. The default transport status is already DEFER. */
3010 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3012 for (addr = addrlist; addr != NULL; addr = addr->next)
3014 addr->basic_errno = 0;
3015 addr->message = string_sprintf("%s transport found host %s to be "
3016 "local", tblock->name, host->name);
3020 } /* End of block for IP address lookup */
3022 /* If this is a continued delivery, we are interested only in the host
3023 which matches the name of the existing open channel. The check is put
3024 here after the local host lookup, in case the name gets expanded as a
3025 result of the lookup. Set expired FALSE, to save the outer loop executing
3028 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3029 Ustrcmp(continue_host_address, host->address) != 0))
3032 continue; /* With next host */
3035 /* Reset the default next host in case a multihomed host whose addresses
3036 are not looked up till just above added to the host list. */
3038 nexthost = host->next;
3040 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3041 domain is in queue_smtp_domains, we don't actually want to attempt any
3042 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3043 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3044 were not in it. We don't want to hold up all SMTP deliveries! Except when
3045 doing a two-stage queue run, don't do this if forcing. */
3047 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3048 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3049 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3052 for (addr = addrlist; addr != NULL; addr = addr->next)
3054 if (addr->transport_return != DEFER) continue;
3055 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3057 continue; /* With next host */
3060 /* Count hosts being considered - purely for an intelligent comment
3061 if none are usable. */
3065 /* Set $host and $host address now in case they are needed for the
3066 interface expansion or the serialize_hosts check; they remain set if an
3067 actual delivery happens. */
3069 deliver_host = host->name;
3070 deliver_host_address = host->address;
3071 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3072 : host->dnssec == DS_NO ? US"no"
3075 /* Set up a string for adding to the retry key if the port number is not
3076 the standard SMTP port. A host may have its own port setting that overrides
3079 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3081 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3083 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3084 string changes upon expansion, we must add it to the key that is used for
3085 retries, because connections to the same host from a different interface
3086 should be treated separately. */
3088 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3089 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3092 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3094 /* The first time round the outer loop, check the status of the host by
3095 inspecting the retry data. The second time round, we are interested only
3096 in expired hosts that haven't been tried since this message arrived. */
3098 if (cutoff_retry == 0)
3100 /* Ensure the status of the address is set by checking retry data if
3101 necessary. There maybe host-specific retry data (applicable to all
3102 messages) and also data for retries of a specific message at this host.
3103 If either of these retry records are actually read, the keys used are
3104 returned to save recomputing them later. */
3106 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3107 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
3109 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3110 (host->address == NULL)? US"" : host->address, pistring,
3111 (host->status == hstatus_usable)? "usable" :
3112 (host->status == hstatus_unusable)? "unusable" :
3113 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3115 /* Skip this address if not usable at this time, noting if it wasn't
3116 actually expired, both locally and in the address. */
3118 switch (host->status)
3120 case hstatus_unusable:
3122 setflag(addrlist, af_retry_skipped);
3125 case hstatus_unusable_expired:
3128 case hwhy_retry: hosts_retry++; break;
3129 case hwhy_failed: hosts_fail++; break;
3130 case hwhy_deferred: hosts_defer++; break;
3133 /* If there was a retry message key, implying that previously there
3134 was a message-specific defer, we don't want to update the list of
3135 messages waiting for these hosts. */
3137 if (retry_message_key != NULL) update_waiting = FALSE;
3138 continue; /* With the next host or IP address */
3142 /* Second time round the loop: if the address is set but expired, and
3143 the message is newer than the last try, let it through. */
3147 if (host->address == NULL ||
3148 host->status != hstatus_unusable_expired ||
3149 host->last_try > received_time)
3152 debug_printf("trying expired host %s [%s]%s\n",
3153 host->name, host->address, pistring);
3154 host_is_expired = TRUE;
3157 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3158 it remains TRUE only if all hosts are expired and none are actually tried.
3163 /* If this host is listed as one to which access must be serialized,
3164 see if another Exim process has a connection to it, and if so, skip
3165 this host. If not, update the database to record our connection to it
3166 and remember this for later deletion. Do not do any of this if we are
3167 sending the message down a pre-existing connection. */
3170 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3171 host->address, NULL) == OK)
3173 serialize_key = string_sprintf("host-serialize-%s", host->name);
3174 if (!enq_start(serialize_key))
3177 debug_printf("skipping host %s because another Exim process "
3178 "is connected to it\n", host->name);
3185 /* OK, we have an IP address that is not waiting for its retry time to
3186 arrive (it might be expired) OR (second time round the loop) we have an
3187 expired host that hasn't been tried since the message arrived. Have a go
3188 at delivering the message to it. First prepare the addresses by flushing
3189 out the result of previous attempts, and finding the first address that
3190 is still to be delivered. */
3192 first_addr = prepare_addresses(addrlist, host);
3194 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3195 message_id, host->name, host->address, addrlist->address,
3196 (addrlist->next == NULL)? "" : ", ...");
3198 set_process_info("delivering %s to %s [%s] (%s%s)",
3199 message_id, host->name, host->address, addrlist->address,
3200 (addrlist->next == NULL)? "" : ", ...");
3202 /* This is not for real; don't do the delivery. If there are
3203 any remaining hosts, list them. */
3208 set_errno(addrlist, 0, NULL, OK, FALSE);
3209 for (addr = addrlist; addr != NULL; addr = addr->next)
3211 addr->host_used = host;
3212 addr->special_action = '*';
3213 addr->message = US"delivery bypassed by -N option";
3217 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3218 "*** host and remaining hosts:\n", tblock->name);
3219 for (host2 = host; host2 != NULL; host2 = host2->next)
3220 debug_printf(" %s [%s]\n", host2->name,
3221 (host2->address == NULL)? US"unset" : host2->address);
3226 /* This is for real. If the host is expired, we don't count it for
3227 hosts_max_retry. This ensures that all hosts must expire before an address
3228 is timed out, unless hosts_max_try_hardlimit (which protects against
3229 lunatic DNS configurations) is reached.
3231 If the host is not expired and we are about to hit the hosts_max_retry
3232 limit, check to see if there is a subsequent hosts with a different MX
3233 value. If so, make that the next host, and don't count this one. This is a
3234 heuristic to make sure that different MXs do get tried. With a normal kind
3235 of retry rule, they would get tried anyway when the earlier hosts were
3236 delayed, but if the domain has a "retry every time" type of rule - as is
3237 often used for the the very large ISPs, that won't happen. */
3241 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3245 debug_printf("hosts_max_try limit reached with this host\n");
3246 for (h = host; h != NULL; h = h->next)
3247 if (h->mx != host->mx) break;
3251 unexpired_hosts_tried--;
3252 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3253 "and will be tried\n");
3257 /* Attempt the delivery. */
3259 total_hosts_tried++;
3260 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3261 expanded_hosts != NULL, &message_defer, FALSE);
3264 OK => connection made, each address contains its result;
3265 message_defer is set for message-specific defers (when all
3266 recipients are marked defer)
3267 DEFER => there was a non-message-specific delivery problem;
3268 ERROR => there was a problem setting up the arguments for a filter,
3269 or there was a problem with expanding added headers
3272 /* If the result is not OK, there was a non-message-specific problem.
3273 If the result is DEFER, we need to write to the logs saying what happened
3274 for this particular host, except in the case of authentication and TLS
3275 failures, where the log has already been written. If all hosts defer a
3276 general message is written at the end. */
3278 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3279 first_addr->basic_errno != ERRNO_TLSFAILURE)
3280 write_logs(first_addr, host);
3282 #ifdef EXPERIMENTAL_TPDA
3284 tpda_deferred(first_addr, host);
3287 /* If STARTTLS was accepted, but there was a failure in setting up the
3288 TLS session (usually a certificate screwup), and the host is not in
3289 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3290 TLS forcibly turned off. We have to start from scratch with a new SMTP
3291 connection. That's why the retry is done from here, not from within
3292 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3293 session, so the in-clear transmission after those errors, if permitted,
3294 happens inside smtp_deliver().] */
3298 && first_addr->basic_errno == ERRNO_TLSFAILURE
3299 && ob->tls_tempfail_tryclear
3300 && verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3301 host->address, NULL) != OK
3302 # ifdef EXPERIMENTAL_DANE
3303 && verify_check_this_host(&(ob->hosts_require_dane), NULL, host->name,
3304 host->address, NULL) != OK
3308 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3309 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3310 first_addr = prepare_addresses(addrlist, host);
3311 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3312 expanded_hosts != NULL, &message_defer, TRUE);
3313 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3314 write_logs(first_addr, host);
3315 # ifdef EXPERIMENTAL_TPDA
3317 tpda_deferred(first_addr, host);
3320 #endif /*SUPPORT_TLS*/
3323 /* Delivery attempt finished */
3325 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3328 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3329 message_id, host->name, host->address, addrlist->address,
3330 (addrlist->next == NULL)? "" : " (& others)", rs);
3332 /* Release serialization if set up */
3334 if (serialized) enq_end(serialize_key);
3336 /* If the result is DEFER, or if a host retry record is known to exist, we
3337 need to add an item to the retry chain for updating the retry database
3338 at the end of delivery. We only need to add the item to the top address,
3339 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3340 for any other delivery attempts using the same address. (It is copied into
3341 the unusable tree at the outer level, so even if different address blocks
3342 contain the same address, it still won't get tried again.) */
3344 if (rc == DEFER || retry_host_key != NULL)
3346 int delete_flag = (rc != DEFER)? rf_delete : 0;
3347 if (retry_host_key == NULL)
3349 retry_host_key = ob->retry_include_ip_address?
3350 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3351 string_sprintf("T:%S%s", host->name, pistring);
3354 /* If a delivery of another message over an existing SMTP connection
3355 yields DEFER, we do NOT set up retry data for the host. This covers the
3356 case when there are delays in routing the addresses in the second message
3357 that are so long that the server times out. This is alleviated by not
3358 routing addresses that previously had routing defers when handling an
3359 existing connection, but even so, this case may occur (e.g. if a
3360 previously happily routed address starts giving routing defers). If the
3361 host is genuinely down, another non-continued message delivery will
3362 notice it soon enough. */
3364 if (delete_flag != 0 || !continuing)
3365 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3367 /* We may have tried an expired host, if its retry time has come; ensure
3368 the status reflects the expiry for the benefit of any other addresses. */
3372 host->status = (host_is_expired)?
3373 hstatus_unusable_expired : hstatus_unusable;
3374 host->why = hwhy_deferred;
3378 /* If message_defer is set (host was OK, but every recipient got deferred
3379 because of some message-specific problem), or if that had happened
3380 previously so that a message retry key exists, add an appropriate item
3381 to the retry chain. Note that if there was a message defer but now there is
3382 a host defer, the message defer record gets deleted. That seems perfectly
3383 reasonable. Also, stop the message from being remembered as waiting
3384 for specific hosts. */
3386 if (message_defer || retry_message_key != NULL)
3388 int delete_flag = message_defer? 0 : rf_delete;
3389 if (retry_message_key == NULL)
3391 retry_message_key = ob->retry_include_ip_address?
3392 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3394 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3396 retry_add_item(addrlist, retry_message_key,
3397 rf_message | rf_host | delete_flag);
3398 update_waiting = FALSE;
3401 /* Any return other than DEFER (that is, OK or ERROR) means that the
3402 addresses have got their final statuses filled in for this host. In the OK
3403 case, see if any of them are deferred. */
3407 for (addr = addrlist; addr != NULL; addr = addr->next)
3409 if (addr->transport_return == DEFER)
3411 some_deferred = TRUE;
3417 /* If no addresses deferred or the result was ERROR, return. We do this for
3418 ERROR because a failing filter set-up or add_headers expansion is likely to
3419 fail for any host we try. */
3421 if (rc == ERROR || (rc == OK && !some_deferred))
3423 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3424 return TRUE; /* Each address has its status */
3427 /* If the result was DEFER or some individual addresses deferred, let
3428 the loop run to try other hosts with the deferred addresses, except for the
3429 case when we were trying to deliver down an existing channel and failed.
3430 Don't try any other hosts in this case. */
3432 if (continuing) break;
3434 /* If the whole delivery, or some individual addresses, were deferred and
3435 there are more hosts that could be tried, do not count this host towards
3436 the hosts_max_try limit if the age of the message is greater than the
3437 maximum retry time for this host. This means we may try try all hosts,
3438 ignoring the limit, when messages have been around for some time. This is
3439 important because if we don't try all hosts, the address will never time
3440 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3442 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3445 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3447 if (retry != NULL && retry->rules != NULL)
3449 retry_rule *last_rule;
3450 for (last_rule = retry->rules;
3451 last_rule->next != NULL;
3452 last_rule = last_rule->next);
3453 timedout = time(NULL) - received_time > last_rule->timeout;
3455 else timedout = TRUE; /* No rule => timed out */
3459 unexpired_hosts_tried--;
3460 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3461 "hosts_max_try (message older than host's retry time)\n");
3464 } /* End of loop for trying multiple hosts. */
3466 /* This is the end of the loop that repeats iff expired is TRUE and
3467 ob->delay_after_cutoff is FALSE. The second time round we will
3468 try those hosts that haven't been tried since the message arrived. */
3472 debug_printf("all IP addresses skipped or deferred at least one address\n");
3473 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3474 debug_printf("retrying IP addresses not tried since message arrived\n");
3479 /* Get here if all IP addresses are skipped or defer at least one address. In
3480 MUA wrapper mode, this will happen only for connection or other non-message-
3481 specific failures. Force the delivery status for all addresses to FAIL. */
3485 for (addr = addrlist; addr != NULL; addr = addr->next)
3486 addr->transport_return = FAIL;
3490 /* In the normal, non-wrapper case, add a standard message to each deferred
3491 address if there hasn't been an error, that is, if it hasn't actually been
3492 tried this time. The variable "expired" will be FALSE if any deliveries were
3493 actually tried, or if there was at least one host that was not expired. That
3494 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3495 a delivery has been tried, an error code will be set, and the failing of the
3496 message is handled by the retry code later.
3498 If queue_smtp is set, or this transport was called to send a subsequent message
3499 down an existing TCP/IP connection, and something caused the host not to be
3500 found, we end up here, but can detect these cases and handle them specially. */
3502 for (addr = addrlist; addr != NULL; addr = addr->next)
3504 /* If host is not NULL, it means that we stopped processing the host list
3505 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3506 means we need to behave as if some hosts were skipped because their retry
3507 time had not come. Specifically, this prevents the address from timing out.
3508 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3509 hosts were tried. */
3513 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3516 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3517 "hosts were tried\n");
3522 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3523 setflag(addr, af_retry_skipped);
3527 if (queue_smtp) /* no deliveries attempted */
3529 addr->transport_return = DEFER;
3530 addr->basic_errno = 0;
3531 addr->message = US"SMTP delivery explicitly queued";
3534 else if (addr->transport_return == DEFER &&
3535 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3536 addr->message == NULL)
3538 addr->basic_errno = ERRNO_HRETRY;
3539 if (continue_hostname != NULL)
3541 addr->message = US"no host found for existing SMTP connection";
3545 setflag(addr, af_pass_message); /* This is not a security risk */
3546 addr->message = (ob->delay_after_cutoff)?
3547 US"retry time not reached for any host after a long failure period" :
3548 US"all hosts have been failing for a long time and were last tried "
3549 "after this message arrived";
3551 /* If we are already using fallback hosts, or there are no fallback hosts
3552 defined, convert the result to FAIL to cause a bounce. */
3554 if (addr->host_list == addr->fallback_hosts ||
3555 addr->fallback_hosts == NULL)
3556 addr->transport_return = FAIL;
3560 if (hosts_retry == hosts_total)
3561 addr->message = US"retry time not reached for any host";
3562 else if (hosts_fail == hosts_total)
3563 addr->message = US"all host address lookups failed permanently";
3564 else if (hosts_defer == hosts_total)
3565 addr->message = US"all host address lookups failed temporarily";
3566 else if (hosts_serial == hosts_total)
3567 addr->message = US"connection limit reached for all hosts";
3568 else if (hosts_fail+hosts_defer == hosts_total)
3569 addr->message = US"all host address lookups failed";
3570 else addr->message = US"some host address lookups failed and retry time "
3571 "not reached for other hosts or connection limit reached";
3576 /* Update the database which keeps information about which messages are waiting
3577 for which hosts to become available. For some message-specific errors, the
3578 update_waiting flag is turned off because we don't want follow-on deliveries in
3579 those cases. If this transport instance is explicitly limited to one message
3580 per connection then follow-on deliveries are not possible and there's no need
3581 to create/update the per-transport wait-<transport_name> database. */
3583 if (update_waiting && tblock->connection_max_messages != 1)
3584 transport_update_waiting(hostlist, tblock->name);
3588 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3590 return TRUE; /* Each address has its status */
3595 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob