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; a later release 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(EXPERIMENTAL_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 # if defined EXPERIMENTAL_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 #ifdef EXPERIMENTAL_PRDR
122 { "hosts_try_prdr", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 { "hosts_verify_avoid_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
129 { "interface", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, interface) },
131 { "keepalive", opt_bool,
132 (void *)offsetof(smtp_transport_options_block, keepalive) },
133 { "lmtp_ignore_quota", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
135 { "max_rcpt", opt_int | opt_public,
136 (void *)offsetof(transport_instance, max_addresses) },
137 { "multi_domain", opt_bool | opt_public,
138 (void *)offsetof(transport_instance, multi_domain) },
139 { "port", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, port) },
141 { "protocol", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, protocol) },
143 { "retry_include_ip_address", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
145 { "serialize_hosts", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
147 { "size_addition", opt_int,
148 (void *)offsetof(smtp_transport_options_block, size_addition) }
150 ,{ "tls_certificate", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
152 { "tls_crl", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_crl) },
154 { "tls_dh_min_bits", opt_int,
155 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
156 { "tls_privatekey", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
158 { "tls_require_ciphers", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
160 { "tls_sni", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_sni) },
162 { "tls_tempfail_tryclear", opt_bool,
163 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
164 { "tls_try_verify_hosts", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
166 { "tls_verify_certificates", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
168 { "tls_verify_hosts", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
171 #ifdef EXPERIMENTAL_TPDA
172 ,{ "tpda_host_defer_action", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
177 /* Size of the options list. An extern variable has to be used so that its
178 address can appear in the tables drtables.c. */
180 int smtp_transport_options_count =
181 sizeof(smtp_transport_options)/sizeof(optionlist);
183 /* Default private options block for the smtp transport. */
185 smtp_transport_options_block smtp_transport_option_defaults = {
187 NULL, /* fallback_hosts */
189 NULL, /* fallback_hostlist */
190 NULL, /* authenticated_sender */
191 US"$primary_hostname", /* helo_data */
192 NULL, /* interface */
194 US"smtp", /* protocol */
196 NULL, /* serialize_hosts */
197 NULL, /* hosts_try_auth */
198 NULL, /* hosts_require_auth */
199 #ifdef EXPERIMENTAL_PRDR
200 NULL, /* hosts_try_prdr */
202 #ifdef EXPERIMENTAL_OCSP
203 US"*", /* hosts_request_ocsp */
204 NULL, /* hosts_require_ocsp */
206 NULL, /* hosts_require_tls */
207 NULL, /* hosts_avoid_tls */
208 US"*", /* hosts_verify_avoid_tls */
209 NULL, /* hosts_avoid_pipelining */
210 NULL, /* hosts_avoid_esmtp */
211 NULL, /* hosts_nopass_tls */
212 5*60, /* command_timeout */
213 5*60, /* connect_timeout; shorter system default overrides */
214 5*60, /* data timeout */
215 10*60, /* final timeout */
216 1024, /* size_addition */
217 5, /* hosts_max_try */
218 50, /* hosts_max_try_hardlimit */
219 TRUE, /* address_retry_include_sender */
220 FALSE, /* allow_localhost */
221 FALSE, /* authenticated_sender_force */
222 FALSE, /* gethostbyname */
223 TRUE, /* dns_qualify_single */
224 FALSE, /* dns_search_parents */
225 NULL, /* dnssec_request_domains */
226 NULL, /* dnssec_require_domains */
227 TRUE, /* delay_after_cutoff */
228 FALSE, /* hosts_override */
229 FALSE, /* hosts_randomize */
230 TRUE, /* keepalive */
231 FALSE, /* lmtp_ignore_quota */
232 TRUE /* retry_include_ip_address */
234 ,NULL, /* tls_certificate */
236 NULL, /* tls_privatekey */
237 NULL, /* tls_require_ciphers */
238 NULL, /* gnutls_require_kx */
239 NULL, /* gnutls_require_mac */
240 NULL, /* gnutls_require_proto */
242 NULL, /* tls_verify_certificates */
243 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
244 /* tls_dh_min_bits */
245 TRUE, /* tls_tempfail_tryclear */
246 NULL, /* tls_verify_hosts */
247 NULL /* tls_try_verify_hosts */
250 ,NULL, /* dkim_canon */
251 NULL, /* dkim_domain */
252 NULL, /* dkim_private_key */
253 NULL, /* dkim_selector */
254 NULL, /* dkim_sign_headers */
255 NULL /* dkim_strict */
257 #ifdef EXPERIMENTAL_TPDA
258 ,NULL /* tpda_host_defer_action */
265 static uschar *smtp_command; /* Points to last cmd for error messages */
266 static uschar *mail_command; /* Points to MAIL cmd for error messages */
267 static BOOL update_waiting; /* TRUE to update the "wait" database */
270 /*************************************************
271 * Setup entry point *
272 *************************************************/
274 /* This function is called when the transport is about to be used,
275 but before running it in a sub-process. It is used for two things:
277 (1) To set the fallback host list in addresses, when delivering.
278 (2) To pass back the interface, port, protocol, and other options, for use
279 during callout verification.
282 tblock pointer to the transport instance block
283 addrlist list of addresses about to be transported
284 tf if not NULL, pointer to block in which to return options
285 uid the uid that will be set (not used)
286 gid the gid that will be set (not used)
287 errmsg place for error message (not used)
289 Returns: OK always (FAIL, DEFER not used)
293 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
294 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
296 smtp_transport_options_block *ob =
297 (smtp_transport_options_block *)(tblock->options_block);
299 errmsg = errmsg; /* Keep picky compilers happy */
303 /* Pass back options if required. This interface is getting very messy. */
307 tf->interface = ob->interface;
309 tf->protocol = ob->protocol;
310 tf->hosts = ob->hosts;
311 tf->hosts_override = ob->hosts_override;
312 tf->hosts_randomize = ob->hosts_randomize;
313 tf->gethostbyname = ob->gethostbyname;
314 tf->qualify_single = ob->dns_qualify_single;
315 tf->search_parents = ob->dns_search_parents;
316 tf->helo_data = ob->helo_data;
319 /* Set the fallback host list for all the addresses that don't have fallback
320 host lists, provided that the local host wasn't present in the original host
323 if (!testflag(addrlist, af_local_host_removed))
325 for (; addrlist != NULL; addrlist = addrlist->next)
326 if (addrlist->fallback_hosts == NULL)
327 addrlist->fallback_hosts = ob->fallback_hostlist;
335 /*************************************************
336 * Initialization entry point *
337 *************************************************/
339 /* Called for each instance, after its options have been read, to
340 enable consistency checks to be done, or anything else that needs
343 Argument: pointer to the transport instance block
348 smtp_transport_init(transport_instance *tblock)
350 smtp_transport_options_block *ob =
351 (smtp_transport_options_block *)(tblock->options_block);
353 /* Retry_use_local_part defaults FALSE if unset */
355 if (tblock->retry_use_local_part == TRUE_UNSET)
356 tblock->retry_use_local_part = FALSE;
358 /* Set the default port according to the protocol */
360 if (ob->port == NULL)
361 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
362 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
364 /* Set up the setup entry point, to be called before subprocesses for this
367 tblock->setup = smtp_transport_setup;
369 /* Complain if any of the timeouts are zero. */
371 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
372 ob->final_timeout <= 0)
373 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
374 "command, data, or final timeout value is zero for %s transport",
377 /* If hosts_override is set and there are local hosts, set the global
378 flag that stops verify from showing router hosts. */
380 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
382 /* If there are any fallback hosts listed, build a chain of host items
383 for them, but do not do any lookups at this time. */
385 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
392 /*************************************************
393 * Set delivery info into all active addresses *
394 *************************************************/
396 /* Only addresses whose status is >= PENDING are relevant. A lesser
397 status means that an address is not currently being processed.
400 addrlist points to a chain of addresses
401 errno_value to put in each address's errno field
402 msg to put in each address's message field
403 rc to put in each address's transport_return field
404 pass_message if TRUE, set the "pass message" flag in the address
406 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
407 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
408 this particular type of timeout.
414 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
419 if (errno_value == ERRNO_CONNECTTIMEOUT)
421 errno_value = ETIMEDOUT;
422 orvalue = RTEF_CTOUT;
424 for (addr = addrlist; addr != NULL; addr = addr->next)
426 if (addr->transport_return < PENDING) continue;
427 addr->basic_errno = errno_value;
428 addr->more_errno |= orvalue;
432 if (pass_message) setflag(addr, af_pass_message);
434 addr->transport_return = rc;
440 /*************************************************
441 * Check an SMTP response *
442 *************************************************/
444 /* This function is given an errno code and the SMTP response buffer
445 to analyse, together with the host identification for generating messages. It
446 sets an appropriate message and puts the first digit of the response code into
447 the yield variable. If no response was actually read, a suitable digit is
451 host the current host, to get its name for messages
452 errno_value pointer to the errno value
453 more_errno from the top address for use with ERRNO_FILTER_FAIL
454 buffer the SMTP response buffer
455 yield where to put a one-digit SMTP response code
456 message where to put an errror message
457 pass_message set TRUE if message is an SMTP response
459 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
462 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
463 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
467 if (smtp_use_pipelining &&
468 (Ustrcmp(smtp_command, "MAIL") == 0 ||
469 Ustrcmp(smtp_command, "RCPT") == 0 ||
470 Ustrcmp(smtp_command, "DATA") == 0))
473 *yield = '4'; /* Default setting is to give a temporary error */
475 /* Handle response timeout */
477 if (*errno_value == ETIMEDOUT)
479 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
480 "after %s%s", host->name, host->address, pl, smtp_command);
481 if (transport_count > 0)
482 *message = US string_sprintf("%s (%d bytes written)", *message,
487 /* Handle malformed SMTP response */
489 if (*errno_value == ERRNO_SMTPFORMAT)
491 uschar *malfresp = string_printing(buffer);
492 while (isspace(*malfresp)) malfresp++;
494 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
495 "%s [%s] in response to %s%s", host->name, host->address, pl,
498 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
499 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
503 /* Handle a failed filter process error; can't send QUIT as we mustn't
506 if (*errno_value == ERRNO_FILTER_FAIL)
508 *message = US string_sprintf("transport filter process failed (%d)%s",
510 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
514 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
517 if (*errno_value == ERRNO_CHHEADER_FAIL)
520 US string_sprintf("failed to expand headers_add or headers_remove: %s",
521 expand_string_message);
525 /* Handle failure to write a complete data block */
527 if (*errno_value == ERRNO_WRITEINCOMPLETE)
529 *message = US string_sprintf("failed to write a data block");
533 /* Handle error responses from the remote mailer. */
537 uschar *s = string_printing(buffer);
538 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
539 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
540 *pass_message = TRUE;
545 /* No data was read. If there is no errno, this must be the EOF (i.e.
546 connection closed) case, which causes deferral. An explicit connection reset
547 error has the same effect. Otherwise, put the host's identity in the message,
548 leaving the errno value to be interpreted as well. In all cases, we have to
549 assume the connection is now dead. */
551 if (*errno_value == 0 || *errno_value == ECONNRESET)
553 *errno_value = ERRNO_SMTPCLOSED;
554 *message = US string_sprintf("Remote host %s [%s] closed connection "
555 "in response to %s%s", host->name, host->address, pl, smtp_command);
557 else *message = US string_sprintf("%s [%s]", host->name, host->address);
564 /*************************************************
565 * Write error message to logs *
566 *************************************************/
568 /* This writes to the main log and to the message log.
571 addr the address item containing error information
572 host the current host
578 write_logs(address_item *addr, host_item *host)
580 if (addr->message != NULL)
582 uschar *message = addr->message;
583 if (addr->basic_errno > 0)
584 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
585 log_write(0, LOG_MAIN, "%s", message);
586 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
591 ((log_extra_selector & LX_outgoing_port) != 0)?
592 string_sprintf("%s [%s]:%d", host->name, host->address,
593 (host->port == PORT_NONE)? 25 : host->port)
595 string_sprintf("%s [%s]", host->name, host->address);
596 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
597 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
598 strerror(addr->basic_errno));
604 #ifdef EXPERIMENTAL_TPDA
605 /*************************************************
606 * Post-defer action *
607 *************************************************/
609 /* This expands an arbitrary per-transport string.
610 It might, for example, be used to write to the database log.
613 ob transport options block
614 addr the address item containing error information
615 host the current host
621 tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
623 uschar *action = ob->tpda_host_defer_action;
627 tpda_delivery_ip = string_copy(host->address);
628 tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
629 tpda_delivery_fqdn = string_copy(host->name);
630 tpda_delivery_local_part = string_copy(addr->local_part);
631 tpda_delivery_domain = string_copy(addr->domain);
632 tpda_defer_errno = addr->basic_errno;
634 tpda_defer_errstr = addr->message
635 ? addr->basic_errno > 0
636 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
637 : string_copy(addr->message)
638 : addr->basic_errno > 0
639 ? string_copy(US strerror(addr->basic_errno))
643 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
644 action, tpda_delivery_ip);
646 router_name = addr->router->name;
647 transport_name = addr->transport->name;
648 if (!expand_string(action) && *expand_string_message)
649 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_defer_action in %s: %s\n",
650 transport_name, expand_string_message);
651 router_name = transport_name = NULL;
657 /*************************************************
658 * Synchronize SMTP responses *
659 *************************************************/
661 /* This function is called from smtp_deliver() to receive SMTP responses from
662 the server, and match them up with the commands to which they relate. When
663 PIPELINING is not in use, this function is called after every command, and is
664 therefore somewhat over-engineered, but it is simpler to use a single scheme
665 that works both with and without PIPELINING instead of having two separate sets
668 The set of commands that are buffered up with pipelining may start with MAIL
669 and may end with DATA; in between are RCPT commands that correspond to the
670 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
671 etc.) are never buffered.
673 Errors after MAIL or DATA abort the whole process leaving the response in the
674 buffer. After MAIL, pending responses are flushed, and the original command is
675 re-instated in big_buffer for error messages. For RCPT commands, the remote is
676 permitted to reject some recipient addresses while accepting others. However
677 certain errors clearly abort the whole process. Set the value in
678 transport_return to PENDING_OK if the address is accepted. If there is a
679 subsequent general error, it will get reset accordingly. If not, it will get
680 converted to OK at the end.
683 addrlist the complete address list
684 include_affixes TRUE if affixes include in RCPT
685 sync_addr ptr to the ptr of the one to start scanning at (updated)
686 host the host we are connected to
687 count the number of responses to read
689 include_sender true if 4xx retry is to include the sender it its key
690 pending_MAIL true if the first response is for MAIL
691 pending_DATA 0 if last command sent was not DATA
692 +1 if previously had a good recipient
693 -1 if not previously had a good recipient
694 inblock incoming SMTP block
695 timeout timeout value
696 buffer buffer for reading response
697 buffsize size of buffer
699 Returns: 3 if at least one address had 2xx and one had 5xx
700 2 if at least one address had 5xx but none had 2xx
701 1 if at least one host had a 2xx response, but none had 5xx
702 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
703 -1 timeout while reading RCPT response
704 -2 I/O or other non-response error for RCPT
705 -3 DATA or MAIL failed - errno and buffer set
709 sync_responses(address_item *addrlist, BOOL include_affixes,
710 address_item **sync_addr, host_item *host, int count,
711 BOOL address_retry_include_sender, BOOL pending_MAIL,
712 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
715 address_item *addr = *sync_addr;
718 /* Handle the response for a MAIL command. On error, reinstate the original
719 command in big_buffer for error message use, and flush any further pending
720 responses before returning, except after I/O errors and timeouts. */
725 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
727 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
728 if (errno == 0 && buffer[0] != 0)
730 uschar flushbuffer[4096];
732 if (buffer[0] == '4')
734 save_errno = ERRNO_MAIL4XX;
735 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
739 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
741 && (errno != 0 || flushbuffer[0] == 0))
750 if (pending_DATA) count--; /* Number of RCPT responses to come */
752 /* Read and handle the required number of RCPT responses, matching each one up
753 with an address by scanning for the next address whose status is PENDING_DEFER.
758 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
760 /* The address was accepted */
762 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
765 addr->transport_return = PENDING_OK;
767 /* If af_dr_retry_exists is set, there was a routing delay on this address;
768 ensure that any address-specific retry record is expunged. We do this both
769 for the basic key and for the version that also includes the sender. */
771 if (testflag(addr, af_dr_retry_exists))
773 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
775 retry_add_item(addr, altkey, rf_delete);
776 retry_add_item(addr, addr->address_retry_key, rf_delete);
780 /* Timeout while reading the response */
782 else if (errno == ETIMEDOUT)
784 int save_errno = errno;
785 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
786 "after RCPT TO:<%s>", host->name, host->address,
787 transport_rcpt_address(addr, include_affixes));
788 set_errno(addrlist, save_errno, message, DEFER, FALSE);
789 retry_add_item(addr, addr->address_retry_key, 0);
790 update_waiting = FALSE;
794 /* Handle other errors in obtaining an SMTP response by returning -1. This
795 will cause all the addresses to be deferred. Restore the SMTP command in
796 big_buffer for which we are checking the response, so the error message
799 else if (errno != 0 || buffer[0] == 0)
801 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
802 transport_rcpt_address(addr, include_affixes));
806 /* Handle SMTP permanent and temporary response codes. */
811 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
812 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
813 host->name, host->address, string_printing(buffer));
814 setflag(addr, af_pass_message);
815 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
817 /* The response was 5xx */
819 if (buffer[0] == '5')
821 addr->transport_return = FAIL;
825 /* The response was 4xx */
829 addr->transport_return = DEFER;
830 addr->basic_errno = ERRNO_RCPT4XX;
831 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
833 /* Log temporary errors if there are more hosts to be tried. */
835 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
837 /* Do not put this message on the list of those waiting for specific
838 hosts, as otherwise it is likely to be tried too often. */
840 update_waiting = FALSE;
842 /* Add a retry item for the address so that it doesn't get tried again
843 too soon. If address_retry_include_sender is true, add the sender address
846 if (address_retry_include_sender)
848 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
850 retry_add_item(addr, altkey, 0);
852 else retry_add_item(addr, addr->address_retry_key, 0);
855 } /* Loop for next RCPT response */
857 /* Update where to start at for the next block of responses, unless we
858 have already handled all the addresses. */
860 if (addr != NULL) *sync_addr = addr->next;
862 /* Handle a response to DATA. If we have not had any good recipients, either
863 previously or in this block, the response is ignored. */
865 if (pending_DATA != 0 &&
866 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
871 if (pending_DATA > 0 || (yield & 1) != 0)
873 if (errno == 0 && buffer[0] == '4')
875 errno = ERRNO_DATA4XX;
876 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
880 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
881 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
882 "is in use and there were no good recipients\n", msg);
885 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
886 present) received 3xx. If any RCPTs were handled and yielded anything other
887 than 4xx, yield will be set non-zero. */
894 /* Do the client side of smtp-level authentication */
897 buffer EHLO response from server (gets overwritten)
898 addrlist chain of potential addresses to deliver
899 host host to deliver to
901 ibp, obp comms channel control blocks
904 OK Success, or failed (but not required): global "smtp_authenticated" set
905 DEFER Failed authentication (and was required)
906 ERROR Internal problem
908 FAIL_SEND Failed communications - transmit
913 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
914 smtp_transport_options_block *ob, BOOL is_esmtp,
915 smtp_inblock *ibp, smtp_outblock *obp)
918 uschar *fail_reason = US"server did not advertise AUTH support";
920 smtp_authenticated = FALSE;
921 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
922 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
923 host->name, host->address, NULL);
925 if (is_esmtp && !regex_AUTH) regex_AUTH =
926 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
929 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
931 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
932 expand_nmax = -1; /* reset */
934 /* Must not do this check until after we have saved the result of the
935 regex match above. */
937 if (require_auth == OK ||
938 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
939 host->address, NULL) == OK)
942 fail_reason = US"no common mechanisms were found";
944 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
946 /* Scan the configured authenticators looking for one which is configured
947 for use as a client, which is not suppressed by client_condition, and
948 whose name matches an authentication mechanism supported by the server.
949 If one is found, attempt to authenticate by calling its client function.
952 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
956 (au->client_condition != NULL &&
957 !expand_check_condition(au->client_condition, au->name,
958 US"client authenticator")))
960 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
962 (au->client)? "client_condition is false" :
963 "not configured as a client");
967 /* Loop to scan supported server mechanisms */
972 int len = Ustrlen(au->public_name);
973 while (isspace(*p)) p++;
975 if (strncmpic(au->public_name, p, len) != 0 ||
976 (p[len] != 0 && !isspace(p[len])))
978 while (*p != 0 && !isspace(*p)) p++;
982 /* Found data for a listed mechanism. Call its client entry. Set
983 a flag in the outblock so that data is overwritten after sending so
984 that reflections don't show it. */
986 fail_reason = US"authentication attempt(s) failed";
987 obp->authenticating = TRUE;
988 rc = (au->info->clientcode)(au, ibp, obp,
989 ob->command_timeout, buffer, bufsize);
990 obp->authenticating = FALSE;
991 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
994 /* A temporary authentication failure must hold up delivery to
995 this host. After a permanent authentication failure, we carry on
996 to try other authentication methods. If all fail hard, try to
997 deliver the message unauthenticated unless require_auth was set. */
1002 smtp_authenticated = TRUE; /* stops the outer loop */
1003 client_authenticator = au->name;
1004 if (au->set_client_id != NULL)
1005 client_authenticated_id = expand_string(au->set_client_id);
1008 /* Failure after writing a command */
1013 /* Failure after reading a response */
1016 if (errno != 0 || buffer[0] != '5') return FAIL;
1017 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1018 au->name, host->name, host->address, buffer);
1021 /* Failure by some other means. In effect, the authenticator
1022 decided it wasn't prepared to handle this case. Typically this
1023 is the result of "fail" in an expansion string. Do we need to
1024 log anything here? Feb 2006: a message is now put in the buffer
1025 if logging is required. */
1029 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1030 "authentication H=%s [%s] %s", au->name, host->name,
1031 host->address, buffer);
1034 /* Internal problem, message in buffer. */
1037 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1041 break; /* If not authenticated, try next authenticator */
1042 } /* Loop for scanning supported server mechanisms */
1043 } /* Loop for further authenticators */
1047 /* If we haven't authenticated, but are required to, give up. */
1049 if (require_auth == OK && !smtp_authenticated)
1051 set_errno(addrlist, ERRNO_AUTHFAIL,
1052 string_sprintf("authentication required but %s", fail_reason), DEFER,
1061 /* Construct AUTH appendix string for MAIL TO */
1064 buffer to build string
1065 addrlist chain of potential addresses to deliver
1066 ob transport options
1068 Globals smtp_authenticated
1069 client_authenticated_sender
1070 Return True on error, otherwise buffer has (possibly empty) terminated string
1074 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1075 smtp_transport_options_block *ob)
1077 uschar *local_authenticated_sender = authenticated_sender;
1080 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1083 if (ob->authenticated_sender != NULL)
1085 uschar *new = expand_string(ob->authenticated_sender);
1088 if (!expand_string_forcedfail)
1090 uschar *message = string_sprintf("failed to expand "
1091 "authenticated_sender: %s", expand_string_message);
1092 set_errno(addrlist, 0, message, DEFER, FALSE);
1096 else if (new[0] != 0) local_authenticated_sender = new;
1099 /* Add the authenticated sender address if present */
1101 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1102 local_authenticated_sender != NULL)
1104 string_format(buffer, bufsize, " AUTH=%s",
1105 auth_xtextencode(local_authenticated_sender,
1106 Ustrlen(local_authenticated_sender)));
1107 client_authenticated_sender = string_copy(local_authenticated_sender);
1117 /*************************************************
1118 * Deliver address list to given host *
1119 *************************************************/
1121 /* If continue_hostname is not null, we get here only when continuing to
1122 deliver down an existing channel. The channel was passed as the standard
1123 input. TLS is never active on a passed channel; the previous process always
1124 closes it down before passing the connection on.
1126 Otherwise, we have to make a connection to the remote host, and do the
1127 initial protocol exchange.
1129 When running as an MUA wrapper, if the sender or any recipient is rejected,
1130 temporarily or permanently, we force failure for all recipients.
1133 addrlist chain of potential addresses to deliver; only those whose
1134 transport_return field is set to PENDING_DEFER are currently
1135 being processed; others should be skipped - they have either
1136 been delivered to an earlier host or IP address, or been
1137 failed by one of them.
1138 host host to deliver to
1139 host_af AF_INET or AF_INET6
1140 port default TCP/IP port to use, in host byte order
1141 interface interface to bind to, or NULL
1142 tblock transport instance block
1143 copy_host TRUE if host set in addr->host_used must be copied, because
1144 it is specific to this call of the transport
1145 message_defer set TRUE if yield is OK, but all addresses were deferred
1146 because of a non-recipient, non-host failure, that is, a
1147 4xx response to MAIL FROM, DATA, or ".". This is a defer
1148 that is specific to the message.
1149 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1150 a second attempt after TLS initialization fails
1152 Returns: OK - the connection was made and the delivery attempted;
1153 the result for each address is in its data block.
1154 DEFER - the connection could not be made, or something failed
1155 while setting up the SMTP session, or there was a
1156 non-message-specific error, such as a timeout.
1157 ERROR - a filter command is specified for this transport,
1158 and there was a problem setting it up; OR helo_data
1159 or add_headers or authenticated_sender is specified
1160 for this transport, and the string failed to expand
1164 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1165 uschar *interface, transport_instance *tblock, BOOL copy_host,
1166 BOOL *message_defer, BOOL suppress_tls)
1169 address_item *sync_addr;
1170 address_item *first_addr = addrlist;
1175 time_t start_delivery_time = time(NULL);
1176 smtp_transport_options_block *ob =
1177 (smtp_transport_options_block *)(tblock->options_block);
1178 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1179 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1181 BOOL send_rset = TRUE;
1182 BOOL send_quit = TRUE;
1183 BOOL setting_up = TRUE;
1184 BOOL completed_address = FALSE;
1187 BOOL pass_message = FALSE;
1188 #ifdef EXPERIMENTAL_PRDR
1189 BOOL prdr_offered = FALSE;
1192 smtp_inblock inblock;
1193 smtp_outblock outblock;
1194 int max_rcpt = tblock->max_addresses;
1195 uschar *igquotstr = US"";
1196 uschar *helo_data = NULL;
1197 uschar *message = NULL;
1198 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1200 uschar buffer[4096];
1201 uschar inbuffer[4096];
1202 uschar outbuffer[1024];
1204 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1206 *message_defer = FALSE;
1207 smtp_command = US"initial connection";
1208 if (max_rcpt == 0) max_rcpt = 999999;
1210 /* Set up the buffer for reading SMTP response packets. */
1212 inblock.buffer = inbuffer;
1213 inblock.buffersize = sizeof(inbuffer);
1214 inblock.ptr = inbuffer;
1215 inblock.ptrend = inbuffer;
1217 /* Set up the buffer for holding SMTP commands while pipelining */
1219 outblock.buffer = outbuffer;
1220 outblock.buffersize = sizeof(outbuffer);
1221 outblock.ptr = outbuffer;
1222 outblock.cmd_count = 0;
1223 outblock.authenticating = FALSE;
1225 /* Reset the parameters of a TLS session. */
1228 tls_out.cipher = NULL; /* the one we may use for this transport */
1229 tls_out.ourcert = NULL;
1230 tls_out.peercert = NULL;
1231 tls_out.peerdn = NULL;
1232 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1235 tls_out.ocsp = OCSP_NOT_REQ;
1237 /* Flip the legacy TLS-related variables over to the outbound set in case
1238 they're used in the context of the transport. Don't bother resetting
1239 afterward as we're in a subprocess. */
1241 tls_modify_variables(&tls_out);
1246 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1251 /* Make a connection to the host if this isn't a continued delivery, and handle
1252 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1253 specially so they can be identified for retries. */
1255 if (continue_hostname == NULL)
1257 inblock.sock = outblock.sock =
1258 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1259 ob->keepalive, ob->dscp); /* This puts port into host->port */
1261 if (inblock.sock < 0)
1263 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1264 NULL, DEFER, FALSE);
1268 /* Expand the greeting message while waiting for the initial response. (Makes
1269 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1270 delayed till here so that $sending_interface and $sending_port are set. */
1272 helo_data = expand_string(ob->helo_data);
1274 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1275 is nevertheless a reasonably clean way of programming this kind of logic,
1276 where you want to escape on any error. */
1280 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1281 ob->command_timeout)) goto RESPONSE_FAILED;
1283 /* Now check if the helo_data expansion went well, and sign off cleanly if
1286 if (helo_data == NULL)
1288 uschar *message = string_sprintf("failed to expand helo_data: %s",
1289 expand_string_message);
1290 set_errno(addrlist, 0, message, DEFER, FALSE);
1296 /** Debugging without sending a message
1297 addrlist->transport_return = DEFER;
1301 /* Errors that occur after this point follow an SMTP command, which is
1302 left in big_buffer by smtp_write_command() for use in error messages. */
1304 smtp_command = big_buffer;
1306 /* Tell the remote who we are...
1308 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1309 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1310 greeting is of this form. The assumption was that the far end supports it
1311 properly... but experience shows that there are some that give 5xx responses,
1312 even though the banner includes "ESMTP" (there's a bloody-minded one that
1313 says "ESMTP not spoken here"). Cope with that case.
1315 September 2000: Time has passed, and it seems reasonable now to always send
1316 EHLO at the start. It is also convenient to make the change while installing
1319 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1320 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1321 would be no way to send out the mails, so there is now a host list
1322 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1323 PIPELINING problem as well. Maybe it can also be useful to cure other
1324 problems with broken servers.
1326 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1327 Then somebody tried it with a Microsoft mailer... It seems that all other
1328 mailers use upper case for some reason (the RFC is quite clear about case
1329 independence) so, for peace of mind, I gave in. */
1331 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1332 host->name, host->address, NULL) != OK;
1334 /* Alas; be careful, since this goto is not an error-out, so conceivably
1335 we might set data between here and the target which we assume to exist
1336 and be usable. I can see this coming back to bite us. */
1341 suppress_tls = FALSE;
1342 ob->tls_tempfail_tryclear = FALSE;
1343 smtp_command = US"SSL-on-connect";
1350 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1351 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1353 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1354 ob->command_timeout))
1356 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1363 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1368 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1370 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1371 ob->command_timeout)) goto RESPONSE_FAILED;
1374 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1375 lmtp_ignore_quota option was set. */
1377 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1378 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1379 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1381 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1384 tls_offered = esmtp &&
1385 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1386 PCRE_EOPT, NULL, 0) >= 0;
1389 #ifdef EXPERIMENTAL_PRDR
1390 prdr_offered = esmtp &&
1391 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1392 PCRE_EOPT, NULL, 0) >= 0) &&
1393 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1394 host->address, NULL) == OK);
1397 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1401 /* For continuing deliveries down the same channel, the socket is the standard
1402 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1403 below). Set up the pointer to where subsequent commands will be left, for
1404 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1405 set from the command line if they were set in the process that passed the
1410 inblock.sock = outblock.sock = fileno(stdin);
1411 smtp_command = big_buffer;
1412 host->port = port; /* Record the port that was used */
1415 /* If TLS is available on this connection, whether continued or not, attempt to
1416 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1417 send another EHLO - the server may give a different answer in secure mode. We
1418 use a separate buffer for reading the response to STARTTLS so that if it is
1419 negative, the original EHLO data is available for subsequent analysis, should
1420 the client not be required to use TLS. If the response is bad, copy the buffer
1421 for error analysis. */
1424 if (tls_offered && !suppress_tls &&
1425 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1426 host->address, NULL) != OK)
1428 uschar buffer2[4096];
1429 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1432 /* If there is an I/O error, transmission of this message is deferred. If
1433 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1434 false, we also defer. However, if there is a temporary rejection of STARTTLS
1435 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1436 STARTTLS, we carry on. This means we will try to send the message in clear,
1437 unless the host is in hosts_require_tls (tested below). */
1439 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1440 ob->command_timeout))
1442 if (errno != 0 || buffer2[0] == 0 ||
1443 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1445 Ustrncpy(buffer, buffer2, sizeof(buffer));
1446 goto RESPONSE_FAILED;
1450 /* STARTTLS accepted: try to negotiate a TLS session. */
1455 int rc = tls_client_start(inblock.sock, host, addrlist, ob);
1457 /* TLS negotiation failed; give an error. From outside, this function may
1458 be called again to try in clear on a new connection, if the options permit
1459 it for this host. */
1463 save_errno = ERRNO_TLSFAILURE;
1464 message = US"failure while setting up TLS session";
1469 /* TLS session is set up */
1471 for (addr = addrlist; addr != NULL; addr = addr->next)
1473 if (addr->transport_return == PENDING_DEFER)
1475 addr->cipher = tls_out.cipher;
1476 addr->ourcert = tls_out.ourcert;
1477 addr->peercert = tls_out.peercert;
1478 addr->peerdn = tls_out.peerdn;
1479 addr->ocsp = tls_out.ocsp;
1485 /* if smtps, we'll have smtp_command set to something else; always safe to
1487 smtp_command = big_buffer;
1489 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1490 helo_data is null, we are dealing with a connection that was passed from
1491 another process, and so we won't have expanded helo_data above. We have to
1492 expand it here. $sending_ip_address and $sending_port are set up right at the
1493 start of the Exim process (in exim.c). */
1495 if (tls_out.active >= 0)
1498 if (helo_data == NULL)
1500 helo_data = expand_string(ob->helo_data);
1501 if (helo_data == NULL)
1503 uschar *message = string_sprintf("failed to expand helo_data: %s",
1504 expand_string_message);
1505 set_errno(addrlist, 0, message, DEFER, FALSE);
1511 /* For SMTPS we need to wait for the initial OK response. */
1514 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1515 ob->command_timeout)) goto RESPONSE_FAILED;
1519 greeting_cmd = "EHLO";
1522 greeting_cmd = "HELO";
1524 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1527 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1528 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1530 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1531 ob->command_timeout))
1532 goto RESPONSE_FAILED;
1535 /* If the host is required to use a secure channel, ensure that we
1538 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1539 host->address, NULL) == OK)
1541 save_errno = ERRNO_TLSREQUIRED;
1542 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1543 host->name, host->address,
1544 tls_offered? "an attempt to start TLS failed" :
1545 "the server did not offer TLS support");
1550 /* If TLS is active, we have just started it up and re-done the EHLO command,
1551 so its response needs to be analyzed. If TLS is not active and this is a
1552 continued session down a previously-used socket, we haven't just done EHLO, so
1555 if (continue_hostname == NULL
1557 || tls_out.active >= 0
1561 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1562 lmtp_ignore_quota option was set. */
1564 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1565 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1566 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1568 /* If the response to EHLO specified support for the SIZE parameter, note
1569 this, provided size_addition is non-negative. */
1571 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1572 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1573 PCRE_EOPT, NULL, 0) >= 0;
1575 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1576 the current host, esmtp will be false, so PIPELINING can never be used. If
1577 the current host matches hosts_avoid_pipelining, don't do it. */
1579 smtp_use_pipelining = esmtp &&
1580 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1581 host->address, NULL) != OK &&
1582 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1583 PCRE_EOPT, NULL, 0) >= 0;
1585 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1586 smtp_use_pipelining? "" : "not ");
1588 #ifdef EXPERIMENTAL_PRDR
1589 prdr_offered = esmtp &&
1590 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1591 PCRE_EOPT, NULL, 0) >= 0 &&
1592 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1593 host->address, NULL) == OK;
1596 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1599 /* Note if the response to EHLO specifies support for the AUTH extension.
1600 If it has, check that this host is one we want to authenticate to, and do
1601 the business. The host name and address must be available when the
1602 authenticator's client driver is running. */
1604 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1605 ob, esmtp, &inblock, &outblock))
1607 default: goto SEND_QUIT;
1609 case FAIL_SEND: goto SEND_FAILED;
1610 case FAIL: goto RESPONSE_FAILED;
1614 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1615 message-specific. */
1619 /* If there is a filter command specified for this transport, we can now
1620 set it up. This cannot be done until the identify of the host is known. */
1622 if (tblock->filter_command != NULL)
1626 sprintf(CS buffer, "%.50s transport", tblock->name);
1627 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1628 TRUE, DEFER, addrlist, buffer, NULL);
1629 transport_filter_timeout = tblock->filter_timeout;
1631 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1636 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1644 /* For messages that have more than the maximum number of envelope recipients,
1645 we want to send several transactions down the same SMTP connection. (See
1646 comments in deliver.c as to how this reconciles, heuristically, with
1647 remote_max_parallel.) This optimization was added to Exim after the following
1648 code was already working. The simplest way to put it in without disturbing the
1649 code was to use a goto to jump back to this point when there is another
1650 transaction to handle. */
1653 sync_addr = first_addr;
1657 completed_address = FALSE;
1660 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1661 qualification, send it, adding something to the message size to allow for
1662 imprecision and things that get added en route. Exim keeps the number of lines
1663 in a message, so we can give an accurate value for the original message, but we
1664 need some additional to handle added headers. (Double "." characters don't get
1665 included in the count.) */
1672 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1676 #ifdef EXPERIMENTAL_PRDR
1677 prdr_active = FALSE;
1680 for (addr = first_addr; addr; addr = addr->next)
1681 if (addr->transport_return == PENDING_DEFER)
1683 for (addr = addr->next; addr; addr = addr->next)
1684 if (addr->transport_return == PENDING_DEFER)
1685 { /* at least two recipients to send */
1687 sprintf(CS p, " PRDR"); p += 5;
1688 goto prdr_is_active;
1696 /* If an authenticated_sender override has been specified for this transport
1697 instance, expand it. If the expansion is forced to fail, and there was already
1698 an authenticated_sender for this message, the original value will be used.
1699 Other expansion failures are serious. An empty result is ignored, but there is
1700 otherwise no check - this feature is expected to be used with LMTP and other
1701 cases where non-standard addresses (e.g. without domains) might be required. */
1703 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1706 /* From here until we send the DATA command, we can make use of PIPELINING
1707 if the server host supports it. The code has to be able to check the responses
1708 at any point, for when the buffer fills up, so we write it totally generally.
1709 When PIPELINING is off, each command written reports that it has flushed the
1712 pending_MAIL = TRUE; /* The block starts with MAIL */
1714 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1715 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1716 mail_command = string_copy(big_buffer); /* Save for later error message */
1720 case -1: /* Transmission error */
1723 case +1: /* Block was sent */
1724 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1725 ob->command_timeout))
1727 if (errno == 0 && buffer[0] == '4')
1729 errno = ERRNO_MAIL4XX;
1730 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1732 goto RESPONSE_FAILED;
1734 pending_MAIL = FALSE;
1738 /* Pass over all the relevant recipient addresses for this host, which are the
1739 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1740 several before we have to read the responses for those seen so far. This
1741 checking is done by a subroutine because it also needs to be done at the end.
1742 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1743 the next one if not all are sent.
1745 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1746 last address because we want to abort if any recipients have any kind of
1747 problem, temporary or permanent. We know that all recipient addresses will have
1748 the PENDING_DEFER status, because only one attempt is ever made, and we know
1749 that max_rcpt will be large, so all addresses will be done at once. */
1751 for (addr = first_addr;
1752 address_count < max_rcpt && addr != NULL;
1758 if (addr->transport_return != PENDING_DEFER) continue;
1761 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1763 /* Now send the RCPT command, and process outstanding responses when
1764 necessary. After a timeout on RCPT, we just end the function, leaving the
1765 yield as OK, because this error can often mean that there is a problem with
1766 just one address, so we don't want to delay the host. */
1768 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1769 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1770 if (count < 0) goto SEND_FAILED;
1773 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1774 &sync_addr, host, count, ob->address_retry_include_sender,
1775 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1778 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1779 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1782 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1783 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1784 case 0: /* No 2xx or 5xx, but no probs */
1787 case -1: goto END_OFF; /* Timeout on RCPT */
1788 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1790 pending_MAIL = FALSE; /* Dealt with MAIL */
1792 } /* Loop for next address */
1794 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1795 permanently or temporarily. We should have flushed and synced after the last
1800 address_item *badaddr;
1801 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1803 if (badaddr->transport_return != PENDING_OK) break;
1805 if (badaddr != NULL)
1807 set_errno(addrlist, 0, badaddr->message, FAIL,
1808 testflag(badaddr, af_pass_message));
1813 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1814 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1815 have a good recipient buffered up if we are pipelining. We don't want to waste
1816 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1817 are pipelining. The responses are all handled by sync_responses(). */
1819 if (ok || (smtp_use_pipelining && !mua_wrapper))
1821 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1822 if (count < 0) goto SEND_FAILED;
1823 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1824 host, count, ob->address_retry_include_sender, pending_MAIL,
1825 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1827 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1828 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1831 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1832 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1833 case 0: break; /* No 2xx or 5xx, but no probs */
1835 case -1: goto END_OFF; /* Timeout on RCPT */
1836 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1840 /* Save the first address of the next batch. */
1844 /* If there were no good recipients (but otherwise there have been no
1845 problems), just set ok TRUE, since we have handled address-specific errors
1846 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1847 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1848 well as body. Set the appropriate timeout value to be used for each chunk.
1849 (Haven't been able to make it work using select() for writing yet.) */
1851 if (!ok) ok = TRUE; else
1853 sigalrm_seen = FALSE;
1854 transport_write_timeout = ob->data_timeout;
1855 smtp_command = US"sending data block"; /* For error messages */
1856 DEBUG(D_transport|D_v)
1857 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1858 transport_count = 0;
1859 #ifndef DISABLE_DKIM
1860 ok = dkim_transport_write_message(addrlist, inblock.sock,
1861 topt_use_crlf | topt_end_dot | topt_escape_headers |
1862 (tblock->body_only? topt_no_headers : 0) |
1863 (tblock->headers_only? topt_no_body : 0) |
1864 (tblock->return_path_add? topt_add_return_path : 0) |
1865 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1866 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1867 0, /* No size limit */
1868 tblock->add_headers, tblock->remove_headers,
1869 US".", US"..", /* Escaping strings */
1870 tblock->rewrite_rules, tblock->rewrite_existflags,
1871 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1872 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1875 ok = transport_write_message(addrlist, inblock.sock,
1876 topt_use_crlf | topt_end_dot | topt_escape_headers |
1877 (tblock->body_only? topt_no_headers : 0) |
1878 (tblock->headers_only? topt_no_body : 0) |
1879 (tblock->return_path_add? topt_add_return_path : 0) |
1880 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1881 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1882 0, /* No size limit */
1883 tblock->add_headers, tblock->remove_headers,
1884 US".", US"..", /* Escaping strings */
1885 tblock->rewrite_rules, tblock->rewrite_existflags);
1888 /* transport_write_message() uses write() because it is called from other
1889 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1890 it can exit with "Broken pipe" as its error. This really means that the
1891 socket got closed at the far end. */
1893 transport_write_timeout = 0; /* for subsequent transports */
1895 /* Failure can either be some kind of I/O disaster (including timeout),
1896 or the failure of a transport filter or the expansion of added headers. */
1900 buffer[0] = 0; /* There hasn't been a response */
1901 goto RESPONSE_FAILED;
1904 /* We used to send the terminating "." explicitly here, but because of
1905 buffering effects at both ends of TCP/IP connections, you don't gain
1906 anything by keeping it separate, so it might as well go in the final
1907 data buffer for efficiency. This is now done by setting the topt_end_dot
1910 smtp_command = US"end of data";
1912 #ifdef EXPERIMENTAL_PRDR
1913 /* For PRDR we optionally get a partial-responses warning
1914 * followed by the individual responses, before going on with
1915 * the overall response. If we don't get the warning then deal
1916 * with per non-PRDR. */
1919 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1921 if (!ok && errno == 0)
1924 case '2': prdr_active = FALSE;
1927 case '4': errno = ERRNO_DATA4XX;
1928 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1935 /* For non-PRDR SMTP, we now read a single response that applies to the
1936 whole message. If it is OK, then all the addresses have been delivered. */
1940 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1942 if (!ok && errno == 0 && buffer[0] == '4')
1944 errno = ERRNO_DATA4XX;
1945 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1949 /* For LMTP, we get back a response for every RCPT command that we sent;
1950 some may be accepted and some rejected. For those that get a response, their
1951 status is fixed; any that are accepted have been handed over, even if later
1952 responses crash - at least, that's how I read RFC 2033.
1954 If all went well, mark the recipient addresses as completed, record which
1955 host/IPaddress they were delivered to, and cut out RSET when sending another
1956 message down the same channel. Write the completed addresses to the journal
1957 now so that they are recorded in case there is a crash of hardware or
1958 software before the spool gets updated. Also record the final SMTP
1959 confirmation if needed (for SMTP only). */
1964 int delivery_time = (int)(time(NULL) - start_delivery_time);
1967 uschar *conf = NULL;
1970 /* Make a copy of the host if it is local to this invocation
1971 of the transport. */
1975 thost = store_get(sizeof(host_item));
1977 thost->name = string_copy(host->name);
1978 thost->address = string_copy(host->address);
1982 /* Set up confirmation if needed - applies only to SMTP */
1985 #ifndef EXPERIMENTAL_TPDA
1986 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1991 uschar *s = string_printing(buffer);
1992 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1995 /* Process all transported addresses - for LMTP or PRDR, read a status for
1998 for (addr = addrlist; addr != first_addr; addr = addr->next)
2000 if (addr->transport_return != PENDING_OK) continue;
2002 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2003 remaining addresses. Otherwise, it's a return code for just the one
2004 address. For temporary errors, add a retry item for the address so that
2005 it doesn't get tried again too soon. */
2007 #ifdef EXPERIMENTAL_PRDR
2008 if (lmtp || prdr_active)
2013 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2016 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2017 addr->message = string_sprintf(
2018 #ifdef EXPERIMENTAL_PRDR
2019 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2021 "LMTP error after %s: %s",
2023 big_buffer, string_printing(buffer));
2024 setflag(addr, af_pass_message); /* Allow message to go to user */
2025 if (buffer[0] == '5')
2026 addr->transport_return = FAIL;
2029 errno = ERRNO_DATA4XX;
2030 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2031 addr->transport_return = DEFER;
2032 #ifdef EXPERIMENTAL_PRDR
2035 retry_add_item(addr, addr->address_retry_key, 0);
2039 completed_address = TRUE; /* NOW we can set this flag */
2040 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2042 uschar *s = string_printing(buffer);
2043 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2047 /* SMTP, or success return from LMTP for this address. Pass back the
2048 actual host that was used. */
2050 addr->transport_return = OK;
2051 addr->more_errno = delivery_time;
2052 addr->host_used = thost;
2053 addr->special_action = flag;
2054 addr->message = conf;
2055 #ifdef EXPERIMENTAL_PRDR
2056 if (prdr_active) addr->flags |= af_prdr_used;
2060 #ifdef EXPERIMENTAL_PRDR
2064 /* Update the journal. For homonymic addresses, use the base address plus
2065 the transport name. See lots of comments in deliver.c about the reasons
2066 for the complications when homonyms are involved. Just carry on after
2067 write error, as it may prove possible to update the spool file later. */
2069 if (testflag(addr, af_homonym))
2070 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2072 sprintf(CS buffer, "%.500s\n", addr->unique);
2074 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2075 len = Ustrlen(CS buffer);
2076 if (write(journal_fd, buffer, len) != len)
2077 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2078 "%s: %s", buffer, strerror(errno));
2082 #ifdef EXPERIMENTAL_PRDR
2085 /* PRDR - get the final, overall response. For any non-success
2086 upgrade all the address statuses. */
2087 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2091 if(errno == 0 && buffer[0] == '4')
2093 errno = ERRNO_DATA4XX;
2094 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2096 for (addr = addrlist; addr != first_addr; addr = addr->next)
2097 if (buffer[0] == '5' || addr->transport_return == OK)
2098 addr->transport_return = PENDING_OK; /* allow set_errno action */
2099 goto RESPONSE_FAILED;
2102 /* Update the journal, or setup retry. */
2103 for (addr = addrlist; addr != first_addr; addr = addr->next)
2104 if (addr->transport_return == OK)
2106 if (testflag(addr, af_homonym))
2107 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2109 sprintf(CS buffer, "%.500s\n", addr->unique);
2111 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2112 len = Ustrlen(CS buffer);
2113 if (write(journal_fd, buffer, len) != len)
2114 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2115 "%s: %s", buffer, strerror(errno));
2117 else if (addr->transport_return == DEFER)
2118 retry_add_item(addr, addr->address_retry_key, -2);
2122 /* Ensure the journal file is pushed out to disk. */
2124 if (EXIMfsync(journal_fd) < 0)
2125 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2131 /* Handle general (not specific to one address) failures here. The value of ok
2132 is used to skip over this code on the falling through case. A timeout causes a
2133 deferral. Other errors may defer or fail according to the response code, and
2134 may set up a special errno value, e.g. after connection chopped, which is
2135 assumed if errno == 0 and there is no text in the buffer. If control reaches
2136 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2137 the problem is not related to this specific message. */
2146 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2147 buffer, &code, &message, &pass_message);
2153 message = US string_sprintf("send() to %s [%s] failed: %s",
2154 host->name, host->address, strerror(save_errno));
2158 /* This label is jumped to directly when a TLS negotiation has failed,
2159 or was not done for a host for which it is required. Values will be set
2160 in message and save_errno, and setting_up will always be true. Treat as
2161 a temporary error. */
2168 /* If the failure happened while setting up the call, see if the failure was
2169 a 5xx response (this will either be on connection, or following HELO - a 5xx
2170 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2171 never going to accept them. For other errors during setting up (timeouts or
2172 whatever), defer all addresses, and yield DEFER, so that the host is not
2173 tried again for a while. */
2176 ok = FALSE; /* For when reached by GOTO */
2182 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2186 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2191 /* We want to handle timeouts after MAIL or "." and loss of connection after
2192 "." specially. They can indicate a problem with the sender address or with
2193 the contents of the message rather than a real error on the connection. These
2194 cases are treated in the same way as a 4xx response. This next bit of code
2195 does the classification. */
2206 message_error = TRUE;
2210 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2211 Ustrncmp(smtp_command,"end ",4) == 0;
2214 case ERRNO_SMTPCLOSED:
2215 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2219 message_error = FALSE;
2223 /* Handle the cases that are treated as message errors. These are:
2225 (a) negative response or timeout after MAIL
2226 (b) negative response after DATA
2227 (c) negative response or timeout or dropped connection after "."
2229 It won't be a negative response or timeout after RCPT, as that is dealt
2230 with separately above. The action in all cases is to set an appropriate
2231 error code for all the addresses, but to leave yield set to OK because the
2232 host itself has not failed. Of course, it might in practice have failed
2233 when we've had a timeout, but if so, we'll discover that at the next
2234 delivery attempt. For a temporary error, set the message_defer flag, and
2235 write to the logs for information if this is not the last host. The error
2236 for the last host will be logged as part of the address's log line. */
2240 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2241 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2244 /* If there's an errno, the message contains just the identity of
2247 if (code != '5') /* Anything other than 5 is treated as temporary */
2250 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2251 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2252 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2253 *message_defer = TRUE;
2257 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2258 ".", or some other transportation error. We defer all addresses and yield
2259 DEFER, except for the case of failed add_headers expansion, or a transport
2260 filter failure, when the yield should be ERROR, to stop it trying other
2265 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2266 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2267 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2273 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2274 SMTP session tidily. However, if there were too many addresses to send in one
2275 message (indicated by first_addr being non-NULL) we want to carry on with the
2276 rest of them. Also, it is desirable to send more than one message down the SMTP
2277 connection if there are several waiting, provided we haven't already sent so
2278 many as to hit the configured limit. The function transport_check_waiting looks
2279 for a waiting message and returns its id. Then transport_pass_socket tries to
2280 set up a continued delivery by passing the socket on to another process. The
2281 variable send_rset is FALSE if a message has just been successfully transfered.
2283 If we are already sending down a continued channel, there may be further
2284 addresses not yet delivered that are aimed at the same host, but which have not
2285 been passed in this run of the transport. In this case, continue_more will be
2286 true, and all we should do is send RSET if necessary, and return, leaving the
2289 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2290 do not want to continue with other messages down the same channel, because that
2291 can lead to looping between two or more messages, all with the same,
2292 temporarily failing address(es). [The retry information isn't updated yet, so
2293 new processes keep on trying.] We probably also don't want to try more of this
2294 message's addresses either.
2296 If we have started a TLS session, we have to end it before passing the
2297 connection to a new process. However, not all servers can handle this (Exim
2298 can), so we do not pass such a connection on if the host matches
2299 hosts_nopass_tls. */
2302 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2303 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2304 continue_more, yield, (first_addr == NULL)? "":"not ");
2306 if (completed_address && ok && send_quit)
2309 if (first_addr != NULL || continue_more ||
2311 (tls_out.active < 0 ||
2312 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2313 host->address, NULL) != OK)
2315 transport_check_waiting(tblock->name, host->name,
2316 tblock->connection_max_messages, new_message_id, &more)
2324 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2326 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2327 host->address, strerror(save_errno));
2330 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2331 ob->command_timeout)))
2334 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2338 DEBUG(D_transport) debug_printf("%s\n", msg);
2343 /* Either RSET was not needed, or it succeeded */
2347 if (first_addr != NULL) /* More addresses still to be sent */
2348 { /* in this run of the transport */
2349 continue_sequence++; /* Causes * in logging */
2352 if (continue_more) return yield; /* More addresses for another run */
2354 /* Pass the socket to a new Exim process. Before doing so, we must shut
2355 down TLS. Not all MTAs allow for the continuation of the SMTP session
2356 when TLS is shut down. We test for this by sending a new EHLO. If we
2357 don't get a good response, we don't attempt to pass the socket on. */
2360 if (tls_out.active >= 0)
2362 tls_close(FALSE, TRUE);
2366 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2367 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2368 ob->command_timeout);
2372 /* If the socket is successfully passed, we musn't send QUIT (or
2373 indeed anything!) from here. */
2375 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2376 new_message_id, inblock.sock))
2382 /* If RSET failed and there are addresses left, they get deferred. */
2384 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2388 /* End off tidily with QUIT unless the connection has died or the socket has
2389 been passed to another process. There has been discussion on the net about what
2390 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2391 to wait for a response, but on the other hand, there isn't anything one can do
2392 with an error response, other than log it. Exim used to do that. However,
2393 further discussion suggested that it is positively advantageous not to wait for
2394 the response, but to close the session immediately. This is supposed to move
2395 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2396 load from the server. (Hosts that are both servers and clients may not see much
2397 difference, of course.) Further discussion indicated that this was safe to do
2398 on Unix systems which have decent implementations of TCP/IP that leave the
2399 connection around for a while (TIME_WAIT) after the application has gone away.
2400 This enables the response sent by the server to be properly ACKed rather than
2401 timed out, as can happen on broken TCP/IP implementations on other OS.
2403 This change is being made on 31-Jul-98. After over a year of trouble-free
2404 operation, the old commented-out code was removed on 17-Sep-99. */
2407 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2412 tls_close(FALSE, TRUE);
2415 /* Close the socket, and return the appropriate value, first setting
2416 works because the NULL setting is passed back to the calling process, and
2417 remote_max_parallel is forced to 1 when delivering over an existing connection,
2419 If all went well and continue_more is set, we shouldn't actually get here if
2420 there are further addresses, as the return above will be taken. However,
2421 writing RSET might have failed, or there may be other addresses whose hosts are
2422 specified in the transports, and therefore not visible at top level, in which
2423 case continue_more won't get set. */
2425 (void)close(inblock.sock);
2426 continue_transport = NULL;
2427 continue_hostname = NULL;
2434 /*************************************************
2435 * Closedown entry point *
2436 *************************************************/
2438 /* This function is called when exim is passed an open smtp channel
2439 from another incarnation, but the message which it has been asked
2440 to deliver no longer exists. The channel is on stdin.
2442 We might do fancy things like looking for another message to send down
2443 the channel, but if the one we sought has gone, it has probably been
2444 delivered by some other process that itself will seek further messages,
2445 so just close down our connection.
2447 Argument: pointer to the transport instance block
2452 smtp_transport_closedown(transport_instance *tblock)
2454 smtp_transport_options_block *ob =
2455 (smtp_transport_options_block *)(tblock->options_block);
2456 smtp_inblock inblock;
2457 smtp_outblock outblock;
2459 uschar inbuffer[4096];
2460 uschar outbuffer[16];
2462 inblock.sock = fileno(stdin);
2463 inblock.buffer = inbuffer;
2464 inblock.buffersize = sizeof(inbuffer);
2465 inblock.ptr = inbuffer;
2466 inblock.ptrend = inbuffer;
2468 outblock.sock = inblock.sock;
2469 outblock.buffersize = sizeof(outbuffer);
2470 outblock.buffer = outbuffer;
2471 outblock.ptr = outbuffer;
2472 outblock.cmd_count = 0;
2473 outblock.authenticating = FALSE;
2475 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2476 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2477 ob->command_timeout);
2478 (void)close(inblock.sock);
2483 /*************************************************
2484 * Prepare addresses for delivery *
2485 *************************************************/
2487 /* This function is called to flush out error settings from previous delivery
2488 attempts to other hosts. It also records whether we got here via an MX record
2489 or not in the more_errno field of the address. We are interested only in
2490 addresses that are still marked DEFER - others may have got delivered to a
2491 previously considered IP address. Set their status to PENDING_DEFER to indicate
2492 which ones are relevant this time.
2495 addrlist the list of addresses
2496 host the host we are delivering to
2498 Returns: the first address for this delivery
2501 static address_item *
2502 prepare_addresses(address_item *addrlist, host_item *host)
2504 address_item *first_addr = NULL;
2506 for (addr = addrlist; addr != NULL; addr = addr->next)
2508 if (addr->transport_return != DEFER) continue;
2509 if (first_addr == NULL) first_addr = addr;
2510 addr->transport_return = PENDING_DEFER;
2511 addr->basic_errno = 0;
2512 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2513 addr->message = NULL;
2515 addr->cipher = NULL;
2516 addr->ourcert = NULL;
2517 addr->peercert = NULL;
2518 addr->peerdn = NULL;
2519 addr->ocsp = OCSP_NOT_REQ;
2527 /*************************************************
2528 * Main entry point *
2529 *************************************************/
2531 /* See local README for interface details. As this is a remote transport, it is
2532 given a chain of addresses to be delivered in one connection, if possible. It
2533 always returns TRUE, indicating that each address has its own independent
2534 status set, except if there is a setting up problem, in which case it returns
2538 smtp_transport_entry(
2539 transport_instance *tblock, /* data for this instantiation */
2540 address_item *addrlist) /* addresses we are working on */
2544 int hosts_defer = 0;
2546 int hosts_looked_up = 0;
2547 int hosts_retry = 0;
2548 int hosts_serial = 0;
2549 int hosts_total = 0;
2550 int total_hosts_tried = 0;
2552 BOOL expired = TRUE;
2553 BOOL continuing = continue_hostname != NULL;
2554 uschar *expanded_hosts = NULL;
2556 uschar *tid = string_sprintf("%s transport", tblock->name);
2557 smtp_transport_options_block *ob =
2558 (smtp_transport_options_block *)(tblock->options_block);
2559 host_item *hostlist = addrlist->host_list;
2560 host_item *host = NULL;
2564 debug_printf("%s transport entered\n", tblock->name);
2565 for (addr = addrlist; addr != NULL; addr = addr->next)
2566 debug_printf(" %s\n", addr->address);
2567 if (continuing) debug_printf("already connected to %s [%s]\n",
2568 continue_hostname, continue_host_address);
2571 /* Set the flag requesting that these hosts be added to the waiting
2572 database if the delivery fails temporarily or if we are running with
2573 queue_smtp or a 2-stage queue run. This gets unset for certain
2574 kinds of error, typically those that are specific to the message. */
2576 update_waiting = TRUE;
2578 /* If a host list is not defined for the addresses - they must all have the
2579 same one in order to be passed to a single transport - or if the transport has
2580 a host list with hosts_override set, use the host list supplied with the
2581 transport. It is an error for this not to exist. */
2583 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2585 if (ob->hosts == NULL)
2587 addrlist->message = string_sprintf("%s transport called with no hosts set",
2589 addrlist->transport_return = PANIC;
2590 return FALSE; /* Only top address has status */
2593 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2596 /* If the transport's host list contains no '$' characters, and we are not
2597 randomizing, it is fixed and therefore a chain of hosts can be built once
2598 and for all, and remembered for subsequent use by other calls to this
2599 transport. If, on the other hand, the host list does contain '$', or we are
2600 randomizing its order, we have to rebuild it each time. In the fixed case,
2601 as the hosts string will never be used again, it doesn't matter that we
2602 replace all the : characters with zeros. */
2604 if (ob->hostlist == NULL)
2606 uschar *s = ob->hosts;
2608 if (Ustrchr(s, '$') != NULL)
2610 expanded_hosts = expand_string(s);
2611 if (expanded_hosts == NULL)
2613 addrlist->message = string_sprintf("failed to expand list of hosts "
2614 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2615 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2616 return FALSE; /* Only top address has status */
2618 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2619 "\"%s\"\n", s, expanded_hosts);
2623 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2625 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2627 /* Check that the expansion yielded something useful. */
2628 if (hostlist == NULL)
2631 string_sprintf("%s transport has empty hosts setting", tblock->name);
2632 addrlist->transport_return = PANIC;
2633 return FALSE; /* Only top address has status */
2636 /* If there was no expansion of hosts, save the host list for
2639 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2642 /* This is not the first time this transport has been run in this delivery;
2643 the host list was built previously. */
2645 else hostlist = ob->hostlist;
2648 /* The host list was supplied with the address. If hosts_randomize is set, we
2649 must sort it into a random order if it did not come from MX records and has not
2650 already been randomized (but don't bother if continuing down an existing
2653 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2655 host_item *newlist = NULL;
2656 while (hostlist != NULL)
2658 host_item *h = hostlist;
2659 hostlist = hostlist->next;
2661 h->sort_key = random_number(100);
2663 if (newlist == NULL)
2668 else if (h->sort_key < newlist->sort_key)
2675 host_item *hh = newlist;
2676 while (hh->next != NULL)
2678 if (h->sort_key < hh->next->sort_key) break;
2686 hostlist = addrlist->host_list = newlist;
2690 /* Sort out the default port. */
2692 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2695 /* For each host-plus-IP-address on the list:
2697 . If this is a continued delivery and the host isn't the one with the
2698 current connection, skip.
2700 . If the status is unusable (i.e. previously failed or retry checked), skip.
2702 . If no IP address set, get the address, either by turning the name into
2703 an address, calling gethostbyname if gethostbyname is on, or by calling
2704 the DNS. The DNS may yield multiple addresses, in which case insert the
2705 extra ones into the list.
2707 . Get the retry data if not previously obtained for this address and set the
2708 field which remembers the state of this address. Skip if the retry time is
2709 not reached. If not, remember whether retry data was found. The retry string
2710 contains both the name and the IP address.
2712 . Scan the list of addresses and mark those whose status is DEFER as
2713 PENDING_DEFER. These are the only ones that will be processed in this cycle
2716 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2717 Some addresses may be successfully delivered, others may fail, and yet
2718 others may get temporary errors and so get marked DEFER.
2720 . The return from the delivery attempt is OK if a connection was made and a
2721 valid SMTP dialogue was completed. Otherwise it is DEFER.
2723 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2725 . If fail to connect, or other defer state, add a retry item.
2727 . If there are any addresses whose status is still DEFER, carry on to the
2728 next host/IPaddress, unless we have tried the number of hosts given
2729 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2730 there is some fancy logic for hosts_max_try that means its limit can be
2731 overstepped in some circumstances.
2733 If we get to the end of the list, all hosts have deferred at least one address,
2734 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2735 delivery attempt to those hosts whose last try was before the arrival time of
2736 the current message. To cope with this, we have to go round the loop a second
2737 time. After that, set the status and error data for any addresses that haven't
2738 had it set already. */
2740 for (cutoff_retry = 0; expired &&
2741 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2744 host_item *nexthost = NULL;
2745 int unexpired_hosts_tried = 0;
2747 for (host = hostlist;
2749 unexpired_hosts_tried < ob->hosts_max_try &&
2750 total_hosts_tried < ob->hosts_max_try_hardlimit;
2756 BOOL serialized = FALSE;
2757 BOOL host_is_expired = FALSE;
2758 BOOL message_defer = FALSE;
2759 BOOL ifchanges = FALSE;
2760 BOOL some_deferred = FALSE;
2761 address_item *first_addr = NULL;
2762 uschar *interface = NULL;
2763 uschar *retry_host_key = NULL;
2764 uschar *retry_message_key = NULL;
2765 uschar *serialize_key = NULL;
2767 /* Default next host is next host. :-) But this can vary if the
2768 hosts_max_try limit is hit (see below). It may also be reset if a host
2769 address is looked up here (in case the host was multihomed). */
2771 nexthost = host->next;
2773 /* If the address hasn't yet been obtained from the host name, look it up
2774 now, unless the host is already marked as unusable. If it is marked as
2775 unusable, it means that the router was unable to find its IP address (in
2776 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2777 the lookup failed last time. We don't get this far if *all* MX records
2778 point to non-existent hosts; that is treated as a hard error.
2780 We can just skip this host entirely. When the hosts came from the router,
2781 the address will timeout based on the other host(s); when the address is
2782 looked up below, there is an explicit retry record added.
2784 Note that we mustn't skip unusable hosts if the address is not unset; they
2785 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2787 if (host->address == NULL)
2789 int new_port, flags;
2791 uschar *canonical_name;
2793 if (host->status >= hstatus_unusable)
2795 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2800 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2802 /* The host name is permitted to have an attached port. Find it, and
2803 strip it from the name. Just remember it for now. */
2805 new_port = host_item_get_port(host);
2807 /* Count hosts looked up */
2811 /* Find by name if so configured, or if it's an IP address. We don't
2812 just copy the IP address, because we need the test-for-local to happen. */
2814 flags = HOST_FIND_BY_A;
2815 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2816 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2818 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2819 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2821 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2822 ob->dnssec_request_domains, ob->dnssec_require_domains,
2823 &canonical_name, NULL);
2825 /* Update the host (and any additional blocks, resulting from
2826 multihoming) with a host-specific port, if any. */
2828 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2830 /* Failure to find the host at this time (usually DNS temporary failure)
2831 is really a kind of routing failure rather than a transport failure.
2832 Therefore we add a retry item of the routing kind, not to stop us trying
2833 to look this name up here again, but to ensure the address gets timed
2834 out if the failures go on long enough. A complete failure at this point
2835 commonly points to a configuration error, but the best action is still
2836 to carry on for the next host. */
2838 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2840 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2842 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2843 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2844 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2845 host->status = hstatus_unusable;
2847 for (addr = addrlist; addr != NULL; addr = addr->next)
2849 if (addr->transport_return != DEFER) continue;
2850 addr->basic_errno = ERRNO_UNKNOWNHOST;
2852 string_sprintf("failed to lookup IP address for %s", host->name);
2857 /* If the host is actually the local host, we may have a problem, or
2858 there may be some cunning configuration going on. In the problem case,
2859 log things and give up. The default transport status is already DEFER. */
2861 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2863 for (addr = addrlist; addr != NULL; addr = addr->next)
2865 addr->basic_errno = 0;
2866 addr->message = string_sprintf("%s transport found host %s to be "
2867 "local", tblock->name, host->name);
2871 } /* End of block for IP address lookup */
2873 /* If this is a continued delivery, we are interested only in the host
2874 which matches the name of the existing open channel. The check is put
2875 here after the local host lookup, in case the name gets expanded as a
2876 result of the lookup. Set expired FALSE, to save the outer loop executing
2879 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2880 Ustrcmp(continue_host_address, host->address) != 0))
2883 continue; /* With next host */
2886 /* Reset the default next host in case a multihomed host whose addresses
2887 are not looked up till just above added to the host list. */
2889 nexthost = host->next;
2891 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2892 domain is in queue_smtp_domains, we don't actually want to attempt any
2893 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2894 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2895 were not in it. We don't want to hold up all SMTP deliveries! Except when
2896 doing a two-stage queue run, don't do this if forcing. */
2898 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2899 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2900 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2903 for (addr = addrlist; addr != NULL; addr = addr->next)
2905 if (addr->transport_return != DEFER) continue;
2906 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2908 continue; /* With next host */
2911 /* Count hosts being considered - purely for an intelligent comment
2912 if none are usable. */
2916 /* Set $host and $host address now in case they are needed for the
2917 interface expansion or the serialize_hosts check; they remain set if an
2918 actual delivery happens. */
2920 deliver_host = host->name;
2921 deliver_host_address = host->address;
2922 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
2923 : host->dnssec == DS_NO ? US"no"
2926 /* Set up a string for adding to the retry key if the port number is not
2927 the standard SMTP port. A host may have its own port setting that overrides
2930 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2932 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2934 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2935 string changes upon expansion, we must add it to the key that is used for
2936 retries, because connections to the same host from a different interface
2937 should be treated separately. */
2939 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2940 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2943 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2945 /* The first time round the outer loop, check the status of the host by
2946 inspecting the retry data. The second time round, we are interested only
2947 in expired hosts that haven't been tried since this message arrived. */
2949 if (cutoff_retry == 0)
2951 /* Ensure the status of the address is set by checking retry data if
2952 necessary. There maybe host-specific retry data (applicable to all
2953 messages) and also data for retries of a specific message at this host.
2954 If either of these retry records are actually read, the keys used are
2955 returned to save recomputing them later. */
2957 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2958 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2960 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2961 (host->address == NULL)? US"" : host->address, pistring,
2962 (host->status == hstatus_usable)? "usable" :
2963 (host->status == hstatus_unusable)? "unusable" :
2964 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2966 /* Skip this address if not usable at this time, noting if it wasn't
2967 actually expired, both locally and in the address. */
2969 switch (host->status)
2971 case hstatus_unusable:
2973 setflag(addrlist, af_retry_skipped);
2976 case hstatus_unusable_expired:
2979 case hwhy_retry: hosts_retry++; break;
2980 case hwhy_failed: hosts_fail++; break;
2981 case hwhy_deferred: hosts_defer++; break;
2984 /* If there was a retry message key, implying that previously there
2985 was a message-specific defer, we don't want to update the list of
2986 messages waiting for these hosts. */
2988 if (retry_message_key != NULL) update_waiting = FALSE;
2989 continue; /* With the next host or IP address */
2993 /* Second time round the loop: if the address is set but expired, and
2994 the message is newer than the last try, let it through. */
2998 if (host->address == NULL ||
2999 host->status != hstatus_unusable_expired ||
3000 host->last_try > received_time)
3003 debug_printf("trying expired host %s [%s]%s\n",
3004 host->name, host->address, pistring);
3005 host_is_expired = TRUE;
3008 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3009 it remains TRUE only if all hosts are expired and none are actually tried.
3014 /* If this host is listed as one to which access must be serialized,
3015 see if another Exim process has a connection to it, and if so, skip
3016 this host. If not, update the database to record our connection to it
3017 and remember this for later deletion. Do not do any of this if we are
3018 sending the message down a pre-existing connection. */
3021 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3022 host->address, NULL) == OK)
3024 serialize_key = string_sprintf("host-serialize-%s", host->name);
3025 if (!enq_start(serialize_key))
3028 debug_printf("skipping host %s because another Exim process "
3029 "is connected to it\n", host->name);
3036 /* OK, we have an IP address that is not waiting for its retry time to
3037 arrive (it might be expired) OR (second time round the loop) we have an
3038 expired host that hasn't been tried since the message arrived. Have a go
3039 at delivering the message to it. First prepare the addresses by flushing
3040 out the result of previous attempts, and finding the first address that
3041 is still to be delivered. */
3043 first_addr = prepare_addresses(addrlist, host);
3045 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3046 message_id, host->name, host->address, addrlist->address,
3047 (addrlist->next == NULL)? "" : ", ...");
3049 set_process_info("delivering %s to %s [%s] (%s%s)",
3050 message_id, host->name, host->address, addrlist->address,
3051 (addrlist->next == NULL)? "" : ", ...");
3053 /* This is not for real; don't do the delivery. If there are
3054 any remaining hosts, list them. */
3059 set_errno(addrlist, 0, NULL, OK, FALSE);
3060 for (addr = addrlist; addr != NULL; addr = addr->next)
3062 addr->host_used = host;
3063 addr->special_action = '*';
3064 addr->message = US"delivery bypassed by -N option";
3068 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3069 "*** host and remaining hosts:\n", tblock->name);
3070 for (host2 = host; host2 != NULL; host2 = host2->next)
3071 debug_printf(" %s [%s]\n", host2->name,
3072 (host2->address == NULL)? US"unset" : host2->address);
3077 /* This is for real. If the host is expired, we don't count it for
3078 hosts_max_retry. This ensures that all hosts must expire before an address
3079 is timed out, unless hosts_max_try_hardlimit (which protects against
3080 lunatic DNS configurations) is reached.
3082 If the host is not expired and we are about to hit the hosts_max_retry
3083 limit, check to see if there is a subsequent hosts with a different MX
3084 value. If so, make that the next host, and don't count this one. This is a
3085 heuristic to make sure that different MXs do get tried. With a normal kind
3086 of retry rule, they would get tried anyway when the earlier hosts were
3087 delayed, but if the domain has a "retry every time" type of rule - as is
3088 often used for the the very large ISPs, that won't happen. */
3092 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3096 debug_printf("hosts_max_try limit reached with this host\n");
3097 for (h = host; h != NULL; h = h->next)
3098 if (h->mx != host->mx) break;
3102 unexpired_hosts_tried--;
3103 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3104 "and will be tried\n");
3108 /* Attempt the delivery. */
3110 total_hosts_tried++;
3111 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3112 expanded_hosts != NULL, &message_defer, FALSE);
3115 OK => connection made, each address contains its result;
3116 message_defer is set for message-specific defers (when all
3117 recipients are marked defer)
3118 DEFER => there was a non-message-specific delivery problem;
3119 ERROR => there was a problem setting up the arguments for a filter,
3120 or there was a problem with expanding added headers
3123 /* If the result is not OK, there was a non-message-specific problem.
3124 If the result is DEFER, we need to write to the logs saying what happened
3125 for this particular host, except in the case of authentication and TLS
3126 failures, where the log has already been written. If all hosts defer a
3127 general message is written at the end. */
3129 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3130 first_addr->basic_errno != ERRNO_TLSFAILURE)
3131 write_logs(first_addr, host);
3133 #ifdef EXPERIMENTAL_TPDA
3135 tpda_deferred(ob, first_addr, host);
3138 /* If STARTTLS was accepted, but there was a failure in setting up the
3139 TLS session (usually a certificate screwup), and the host is not in
3140 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3141 TLS forcibly turned off. We have to start from scratch with a new SMTP
3142 connection. That's why the retry is done from here, not from within
3143 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3144 session, so the in-clear transmission after those errors, if permitted,
3145 happens inside smtp_deliver().] */
3148 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3149 ob->tls_tempfail_tryclear &&
3150 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3151 host->address, NULL) != OK)
3153 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3154 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3155 first_addr = prepare_addresses(addrlist, host);
3156 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3157 expanded_hosts != NULL, &message_defer, TRUE);
3158 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3159 write_logs(first_addr, host);
3160 #ifdef EXPERIMENTAL_TPDA
3162 tpda_deferred(ob, first_addr, host);
3168 /* Delivery attempt finished */
3170 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3173 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3174 message_id, host->name, host->address, addrlist->address,
3175 (addrlist->next == NULL)? "" : " (& others)", rs);
3177 /* Release serialization if set up */
3179 if (serialized) enq_end(serialize_key);
3181 /* If the result is DEFER, or if a host retry record is known to exist, we
3182 need to add an item to the retry chain for updating the retry database
3183 at the end of delivery. We only need to add the item to the top address,
3184 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3185 for any other delivery attempts using the same address. (It is copied into
3186 the unusable tree at the outer level, so even if different address blocks
3187 contain the same address, it still won't get tried again.) */
3189 if (rc == DEFER || retry_host_key != NULL)
3191 int delete_flag = (rc != DEFER)? rf_delete : 0;
3192 if (retry_host_key == NULL)
3194 retry_host_key = ob->retry_include_ip_address?
3195 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3196 string_sprintf("T:%S%s", host->name, pistring);
3199 /* If a delivery of another message over an existing SMTP connection
3200 yields DEFER, we do NOT set up retry data for the host. This covers the
3201 case when there are delays in routing the addresses in the second message
3202 that are so long that the server times out. This is alleviated by not
3203 routing addresses that previously had routing defers when handling an
3204 existing connection, but even so, this case may occur (e.g. if a
3205 previously happily routed address starts giving routing defers). If the
3206 host is genuinely down, another non-continued message delivery will
3207 notice it soon enough. */
3209 if (delete_flag != 0 || !continuing)
3210 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3212 /* We may have tried an expired host, if its retry time has come; ensure
3213 the status reflects the expiry for the benefit of any other addresses. */
3217 host->status = (host_is_expired)?
3218 hstatus_unusable_expired : hstatus_unusable;
3219 host->why = hwhy_deferred;
3223 /* If message_defer is set (host was OK, but every recipient got deferred
3224 because of some message-specific problem), or if that had happened
3225 previously so that a message retry key exists, add an appropriate item
3226 to the retry chain. Note that if there was a message defer but now there is
3227 a host defer, the message defer record gets deleted. That seems perfectly
3228 reasonable. Also, stop the message from being remembered as waiting
3229 for specific hosts. */
3231 if (message_defer || retry_message_key != NULL)
3233 int delete_flag = message_defer? 0 : rf_delete;
3234 if (retry_message_key == NULL)
3236 retry_message_key = ob->retry_include_ip_address?
3237 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3239 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3241 retry_add_item(addrlist, retry_message_key,
3242 rf_message | rf_host | delete_flag);
3243 update_waiting = FALSE;
3246 /* Any return other than DEFER (that is, OK or ERROR) means that the
3247 addresses have got their final statuses filled in for this host. In the OK
3248 case, see if any of them are deferred. */
3252 for (addr = addrlist; addr != NULL; addr = addr->next)
3254 if (addr->transport_return == DEFER)
3256 some_deferred = TRUE;
3262 /* If no addresses deferred or the result was ERROR, return. We do this for
3263 ERROR because a failing filter set-up or add_headers expansion is likely to
3264 fail for any host we try. */
3266 if (rc == ERROR || (rc == OK && !some_deferred))
3268 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3269 return TRUE; /* Each address has its status */
3272 /* If the result was DEFER or some individual addresses deferred, let
3273 the loop run to try other hosts with the deferred addresses, except for the
3274 case when we were trying to deliver down an existing channel and failed.
3275 Don't try any other hosts in this case. */
3277 if (continuing) break;
3279 /* If the whole delivery, or some individual addresses, were deferred and
3280 there are more hosts that could be tried, do not count this host towards
3281 the hosts_max_try limit if the age of the message is greater than the
3282 maximum retry time for this host. This means we may try try all hosts,
3283 ignoring the limit, when messages have been around for some time. This is
3284 important because if we don't try all hosts, the address will never time
3285 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3287 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3290 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3292 if (retry != NULL && retry->rules != NULL)
3294 retry_rule *last_rule;
3295 for (last_rule = retry->rules;
3296 last_rule->next != NULL;
3297 last_rule = last_rule->next);
3298 timedout = time(NULL) - received_time > last_rule->timeout;
3300 else timedout = TRUE; /* No rule => timed out */
3304 unexpired_hosts_tried--;
3305 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3306 "hosts_max_try (message older than host's retry time)\n");
3309 } /* End of loop for trying multiple hosts. */
3311 /* This is the end of the loop that repeats iff expired is TRUE and
3312 ob->delay_after_cutoff is FALSE. The second time round we will
3313 try those hosts that haven't been tried since the message arrived. */
3317 debug_printf("all IP addresses skipped or deferred at least one address\n");
3318 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3319 debug_printf("retrying IP addresses not tried since message arrived\n");
3324 /* Get here if all IP addresses are skipped or defer at least one address. In
3325 MUA wrapper mode, this will happen only for connection or other non-message-
3326 specific failures. Force the delivery status for all addresses to FAIL. */
3330 for (addr = addrlist; addr != NULL; addr = addr->next)
3331 addr->transport_return = FAIL;
3335 /* In the normal, non-wrapper case, add a standard message to each deferred
3336 address if there hasn't been an error, that is, if it hasn't actually been
3337 tried this time. The variable "expired" will be FALSE if any deliveries were
3338 actually tried, or if there was at least one host that was not expired. That
3339 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3340 a delivery has been tried, an error code will be set, and the failing of the
3341 message is handled by the retry code later.
3343 If queue_smtp is set, or this transport was called to send a subsequent message
3344 down an existing TCP/IP connection, and something caused the host not to be
3345 found, we end up here, but can detect these cases and handle them specially. */
3347 for (addr = addrlist; addr != NULL; addr = addr->next)
3349 /* If host is not NULL, it means that we stopped processing the host list
3350 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3351 means we need to behave as if some hosts were skipped because their retry
3352 time had not come. Specifically, this prevents the address from timing out.
3353 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3354 hosts were tried. */
3358 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3361 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3362 "hosts were tried\n");
3367 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3368 setflag(addr, af_retry_skipped);
3372 if (queue_smtp) /* no deliveries attempted */
3374 addr->transport_return = DEFER;
3375 addr->basic_errno = 0;
3376 addr->message = US"SMTP delivery explicitly queued";
3379 else if (addr->transport_return == DEFER &&
3380 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3381 addr->message == NULL)
3383 addr->basic_errno = ERRNO_HRETRY;
3384 if (continue_hostname != NULL)
3386 addr->message = US"no host found for existing SMTP connection";
3390 setflag(addr, af_pass_message); /* This is not a security risk */
3391 addr->message = (ob->delay_after_cutoff)?
3392 US"retry time not reached for any host after a long failure period" :
3393 US"all hosts have been failing for a long time and were last tried "
3394 "after this message arrived";
3396 /* If we are already using fallback hosts, or there are no fallback hosts
3397 defined, convert the result to FAIL to cause a bounce. */
3399 if (addr->host_list == addr->fallback_hosts ||
3400 addr->fallback_hosts == NULL)
3401 addr->transport_return = FAIL;
3405 if (hosts_retry == hosts_total)
3406 addr->message = US"retry time not reached for any host";
3407 else if (hosts_fail == hosts_total)
3408 addr->message = US"all host address lookups failed permanently";
3409 else if (hosts_defer == hosts_total)
3410 addr->message = US"all host address lookups failed temporarily";
3411 else if (hosts_serial == hosts_total)
3412 addr->message = US"connection limit reached for all hosts";
3413 else if (hosts_fail+hosts_defer == hosts_total)
3414 addr->message = US"all host address lookups failed";
3415 else addr->message = US"some host address lookups failed and retry time "
3416 "not reached for other hosts or connection limit reached";
3421 /* Update the database which keeps information about which messages are waiting
3422 for which hosts to become available. For some message-specific errors, the
3423 update_waiting flag is turned off because we don't want follow-on deliveries in
3424 those cases. If this transport instance is explicitly limited to one message
3425 per connection then follow-on deliveries are not possible and there's no need
3426 to create/update the per-transport wait-<transport_name> database. */
3428 if (update_waiting && tblock->connection_max_messages != 1)
3429 transport_update_waiting(hostlist, tblock->name);
3433 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3435 return TRUE; /* Each address has its status */
3440 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob