1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
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 { "dscp", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dscp) },
60 { "fallback_hosts", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
62 { "final_timeout", opt_time,
63 (void *)offsetof(smtp_transport_options_block, final_timeout) },
64 { "gethostbyname", opt_bool,
65 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
67 /* These are no longer honoured, as of Exim 4.80; for now, we silently
68 ignore; a later release will warn, and a later-still release will remove
69 these options, so that using them becomes an error. */
70 { "gnutls_require_kx", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
72 { "gnutls_require_mac", opt_stringptr,
73 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
74 { "gnutls_require_protocols", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 { "hosts_require_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
107 { "hosts_try_auth", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
110 { "hosts_verify_avoid_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
113 { "interface", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, interface) },
115 { "keepalive", opt_bool,
116 (void *)offsetof(smtp_transport_options_block, keepalive) },
117 { "lmtp_ignore_quota", opt_bool,
118 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
119 { "max_rcpt", opt_int | opt_public,
120 (void *)offsetof(transport_instance, max_addresses) },
121 { "multi_domain", opt_bool | opt_public,
122 (void *)offsetof(transport_instance, multi_domain) },
123 { "port", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, port) },
125 { "protocol", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, protocol) },
127 { "retry_include_ip_address", opt_bool,
128 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
129 { "serialize_hosts", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
131 { "size_addition", opt_int,
132 (void *)offsetof(smtp_transport_options_block, size_addition) }
134 ,{ "tls_certificate", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
136 { "tls_crl", opt_stringptr,
137 (void *)offsetof(smtp_transport_options_block, tls_crl) },
138 { "tls_dh_min_bits", opt_int,
139 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
140 { "tls_privatekey", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
142 { "tls_require_ciphers", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
144 { "tls_sni", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, tls_sni) },
146 { "tls_tempfail_tryclear", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
148 { "tls_verify_certificates", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
153 /* Size of the options list. An extern variable has to be used so that its
154 address can appear in the tables drtables.c. */
156 int smtp_transport_options_count =
157 sizeof(smtp_transport_options)/sizeof(optionlist);
159 /* Default private options block for the smtp transport. */
161 smtp_transport_options_block smtp_transport_option_defaults = {
163 NULL, /* fallback_hosts */
165 NULL, /* fallback_hostlist */
166 NULL, /* authenticated_sender */
167 US"$primary_hostname", /* helo_data */
168 NULL, /* interface */
170 US"smtp", /* protocol */
172 NULL, /* serialize_hosts */
173 NULL, /* hosts_try_auth */
174 NULL, /* hosts_require_auth */
175 NULL, /* hosts_require_tls */
176 NULL, /* hosts_avoid_tls */
177 US"*", /* hosts_verify_avoid_tls */
178 NULL, /* hosts_avoid_pipelining */
179 NULL, /* hosts_avoid_esmtp */
180 NULL, /* hosts_nopass_tls */
181 5*60, /* command_timeout */
182 5*60, /* connect_timeout; shorter system default overrides */
183 5*60, /* data timeout */
184 10*60, /* final timeout */
185 1024, /* size_addition */
186 5, /* hosts_max_try */
187 50, /* hosts_max_try_hardlimit */
188 TRUE, /* address_retry_include_sender */
189 FALSE, /* allow_localhost */
190 FALSE, /* authenticated_sender_force */
191 FALSE, /* gethostbyname */
192 TRUE, /* dns_qualify_single */
193 FALSE, /* dns_search_parents */
194 TRUE, /* delay_after_cutoff */
195 FALSE, /* hosts_override */
196 FALSE, /* hosts_randomize */
197 TRUE, /* keepalive */
198 FALSE, /* lmtp_ignore_quota */
199 TRUE /* retry_include_ip_address */
201 ,NULL, /* tls_certificate */
203 NULL, /* tls_privatekey */
204 NULL, /* tls_require_ciphers */
205 NULL, /* gnutls_require_kx */
206 NULL, /* gnutls_require_mac */
207 NULL, /* gnutls_require_proto */
209 NULL, /* tls_verify_certificates */
210 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
211 /* tls_dh_min_bits */
212 TRUE /* tls_tempfail_tryclear */
215 ,NULL, /* dkim_canon */
216 NULL, /* dkim_domain */
217 NULL, /* dkim_private_key */
218 NULL, /* dkim_selector */
219 NULL, /* dkim_sign_headers */
220 NULL /* dkim_strict */
227 static uschar *smtp_command; /* Points to last cmd for error messages */
228 static uschar *mail_command; /* Points to MAIL cmd for error messages */
229 static BOOL update_waiting; /* TRUE to update the "wait" database */
232 /*************************************************
233 * Setup entry point *
234 *************************************************/
236 /* This function is called when the transport is about to be used,
237 but before running it in a sub-process. It is used for two things:
239 (1) To set the fallback host list in addresses, when delivering.
240 (2) To pass back the interface, port, protocol, and other options, for use
241 during callout verification.
244 tblock pointer to the transport instance block
245 addrlist list of addresses about to be transported
246 tf if not NULL, pointer to block in which to return options
247 uid the uid that will be set (not used)
248 gid the gid that will be set (not used)
249 errmsg place for error message (not used)
251 Returns: OK always (FAIL, DEFER not used)
255 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
256 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
258 smtp_transport_options_block *ob =
259 (smtp_transport_options_block *)(tblock->options_block);
261 errmsg = errmsg; /* Keep picky compilers happy */
265 /* Pass back options if required. This interface is getting very messy. */
269 tf->interface = ob->interface;
271 tf->protocol = ob->protocol;
272 tf->hosts = ob->hosts;
273 tf->hosts_override = ob->hosts_override;
274 tf->hosts_randomize = ob->hosts_randomize;
275 tf->gethostbyname = ob->gethostbyname;
276 tf->qualify_single = ob->dns_qualify_single;
277 tf->search_parents = ob->dns_search_parents;
278 tf->helo_data = ob->helo_data;
281 /* Set the fallback host list for all the addresses that don't have fallback
282 host lists, provided that the local host wasn't present in the original host
285 if (!testflag(addrlist, af_local_host_removed))
287 for (; addrlist != NULL; addrlist = addrlist->next)
288 if (addrlist->fallback_hosts == NULL)
289 addrlist->fallback_hosts = ob->fallback_hostlist;
297 /*************************************************
298 * Initialization entry point *
299 *************************************************/
301 /* Called for each instance, after its options have been read, to
302 enable consistency checks to be done, or anything else that needs
305 Argument: pointer to the transport instance block
310 smtp_transport_init(transport_instance *tblock)
312 smtp_transport_options_block *ob =
313 (smtp_transport_options_block *)(tblock->options_block);
315 /* Retry_use_local_part defaults FALSE if unset */
317 if (tblock->retry_use_local_part == TRUE_UNSET)
318 tblock->retry_use_local_part = FALSE;
320 /* Set the default port according to the protocol */
322 if (ob->port == NULL)
323 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
324 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
326 /* Set up the setup entry point, to be called before subprocesses for this
329 tblock->setup = smtp_transport_setup;
331 /* Complain if any of the timeouts are zero. */
333 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
334 ob->final_timeout <= 0)
335 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
336 "command, data, or final timeout value is zero for %s transport",
339 /* If hosts_override is set and there are local hosts, set the global
340 flag that stops verify from showing router hosts. */
342 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
344 /* If there are any fallback hosts listed, build a chain of host items
345 for them, but do not do any lookups at this time. */
347 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
354 /*************************************************
355 * Set delivery info into all active addresses *
356 *************************************************/
358 /* Only addresses whose status is >= PENDING are relevant. A lesser
359 status means that an address is not currently being processed.
362 addrlist points to a chain of addresses
363 errno_value to put in each address's errno field
364 msg to put in each address's message field
365 rc to put in each address's transport_return field
366 pass_message if TRUE, set the "pass message" flag in the address
368 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
369 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
370 this particular type of timeout.
376 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
381 if (errno_value == ERRNO_CONNECTTIMEOUT)
383 errno_value = ETIMEDOUT;
384 orvalue = RTEF_CTOUT;
386 for (addr = addrlist; addr != NULL; addr = addr->next)
388 if (addr->transport_return < PENDING) continue;
389 addr->basic_errno = errno_value;
390 addr->more_errno |= orvalue;
394 if (pass_message) setflag(addr, af_pass_message);
396 addr->transport_return = rc;
402 /*************************************************
403 * Check an SMTP response *
404 *************************************************/
406 /* This function is given an errno code and the SMTP response buffer
407 to analyse, together with the host identification for generating messages. It
408 sets an appropriate message and puts the first digit of the response code into
409 the yield variable. If no response was actually read, a suitable digit is
413 host the current host, to get its name for messages
414 errno_value pointer to the errno value
415 more_errno from the top address for use with ERRNO_FILTER_FAIL
416 buffer the SMTP response buffer
417 yield where to put a one-digit SMTP response code
418 message where to put an errror message
419 pass_message set TRUE if message is an SMTP response
421 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
424 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
425 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
429 if (smtp_use_pipelining &&
430 (Ustrcmp(smtp_command, "MAIL") == 0 ||
431 Ustrcmp(smtp_command, "RCPT") == 0 ||
432 Ustrcmp(smtp_command, "DATA") == 0))
435 *yield = '4'; /* Default setting is to give a temporary error */
437 /* Handle response timeout */
439 if (*errno_value == ETIMEDOUT)
441 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
442 "after %s%s", host->name, host->address, pl, smtp_command);
443 if (transport_count > 0)
444 *message = US string_sprintf("%s (%d bytes written)", *message,
449 /* Handle malformed SMTP response */
451 if (*errno_value == ERRNO_SMTPFORMAT)
453 uschar *malfresp = string_printing(buffer);
454 while (isspace(*malfresp)) malfresp++;
456 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
457 "%s [%s] in response to %s%s", host->name, host->address, pl,
460 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
461 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
465 /* Handle a failed filter process error; can't send QUIT as we mustn't
468 if (*errno_value == ERRNO_FILTER_FAIL)
470 *message = US string_sprintf("transport filter process failed (%d)%s",
472 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
476 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
479 if (*errno_value == ERRNO_CHHEADER_FAIL)
482 US string_sprintf("failed to expand headers_add or headers_remove: %s",
483 expand_string_message);
487 /* Handle failure to write a complete data block */
489 if (*errno_value == ERRNO_WRITEINCOMPLETE)
491 *message = US string_sprintf("failed to write a data block");
495 /* Handle error responses from the remote mailer. */
499 uschar *s = string_printing(buffer);
500 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
501 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
502 *pass_message = TRUE;
507 /* No data was read. If there is no errno, this must be the EOF (i.e.
508 connection closed) case, which causes deferral. An explicit connection reset
509 error has the same effect. Otherwise, put the host's identity in the message,
510 leaving the errno value to be interpreted as well. In all cases, we have to
511 assume the connection is now dead. */
513 if (*errno_value == 0 || *errno_value == ECONNRESET)
515 *errno_value = ERRNO_SMTPCLOSED;
516 *message = US string_sprintf("Remote host %s [%s] closed connection "
517 "in response to %s%s", host->name, host->address, pl, smtp_command);
519 else *message = US string_sprintf("%s [%s]", host->name, host->address);
526 /*************************************************
527 * Write error message to logs *
528 *************************************************/
530 /* This writes to the main log and to the message log.
533 addr the address item containing error information
534 host the current host
540 write_logs(address_item *addr, host_item *host)
542 if (addr->message != NULL)
544 uschar *message = addr->message;
545 if (addr->basic_errno > 0)
546 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
547 log_write(0, LOG_MAIN, "%s", message);
548 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
553 ((log_extra_selector & LX_outgoing_port) != 0)?
554 string_sprintf("%s [%s]:%d", host->name, host->address,
555 (host->port == PORT_NONE)? 25 : host->port)
557 string_sprintf("%s [%s]", host->name, host->address);
558 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
559 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
560 strerror(addr->basic_errno));
566 /*************************************************
567 * Synchronize SMTP responses *
568 *************************************************/
570 /* This function is called from smtp_deliver() to receive SMTP responses from
571 the server, and match them up with the commands to which they relate. When
572 PIPELINING is not in use, this function is called after every command, and is
573 therefore somewhat over-engineered, but it is simpler to use a single scheme
574 that works both with and without PIPELINING instead of having two separate sets
577 The set of commands that are buffered up with pipelining may start with MAIL
578 and may end with DATA; in between are RCPT commands that correspond to the
579 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
580 etc.) are never buffered.
582 Errors after MAIL or DATA abort the whole process leaving the response in the
583 buffer. After MAIL, pending responses are flushed, and the original command is
584 re-instated in big_buffer for error messages. For RCPT commands, the remote is
585 permitted to reject some recipient addresses while accepting others. However
586 certain errors clearly abort the whole process. Set the value in
587 transport_return to PENDING_OK if the address is accepted. If there is a
588 subsequent general error, it will get reset accordingly. If not, it will get
589 converted to OK at the end.
592 addrlist the complete address list
593 include_affixes TRUE if affixes include in RCPT
594 sync_addr ptr to the ptr of the one to start scanning at (updated)
595 host the host we are connected to
596 count the number of responses to read
598 include_sender true if 4xx retry is to include the sender it its key
599 pending_MAIL true if the first response is for MAIL
600 pending_DATA 0 if last command sent was not DATA
601 +1 if previously had a good recipient
602 -1 if not previously had a good recipient
603 inblock incoming SMTP block
604 timeout timeout value
605 buffer buffer for reading response
606 buffsize size of buffer
608 Returns: 3 if at least one address had 2xx and one had 5xx
609 2 if at least one address had 5xx but none had 2xx
610 1 if at least one host had a 2xx response, but none had 5xx
611 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
612 -1 timeout while reading RCPT response
613 -2 I/O or other non-response error for RCPT
614 -3 DATA or MAIL failed - errno and buffer set
618 sync_responses(address_item *addrlist, BOOL include_affixes,
619 address_item **sync_addr, host_item *host, int count,
620 BOOL address_retry_include_sender, BOOL pending_MAIL,
621 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
624 address_item *addr = *sync_addr;
627 /* Handle the response for a MAIL command. On error, reinstate the original
628 command in big_buffer for error message use, and flush any further pending
629 responses before returning, except after I/O errors and timeouts. */
634 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
636 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
637 if (errno == 0 && buffer[0] != 0)
639 uschar flushbuffer[4096];
641 if (buffer[0] == '4')
643 save_errno = ERRNO_MAIL4XX;
644 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
648 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
650 && (errno != 0 || flushbuffer[0] == 0))
659 if (pending_DATA) count--; /* Number of RCPT responses to come */
661 /* Read and handle the required number of RCPT responses, matching each one up
662 with an address by scanning for the next address whose status is PENDING_DEFER.
667 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
669 /* The address was accepted */
671 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
674 addr->transport_return = PENDING_OK;
676 /* If af_dr_retry_exists is set, there was a routing delay on this address;
677 ensure that any address-specific retry record is expunged. We do this both
678 for the basic key and for the version that also includes the sender. */
680 if (testflag(addr, af_dr_retry_exists))
682 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
684 retry_add_item(addr, altkey, rf_delete);
685 retry_add_item(addr, addr->address_retry_key, rf_delete);
689 /* Timeout while reading the response */
691 else if (errno == ETIMEDOUT)
693 int save_errno = errno;
694 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
695 "after RCPT TO:<%s>", host->name, host->address,
696 transport_rcpt_address(addr, include_affixes));
697 set_errno(addrlist, save_errno, message, DEFER, FALSE);
698 retry_add_item(addr, addr->address_retry_key, 0);
699 update_waiting = FALSE;
703 /* Handle other errors in obtaining an SMTP response by returning -1. This
704 will cause all the addresses to be deferred. Restore the SMTP command in
705 big_buffer for which we are checking the response, so the error message
708 else if (errno != 0 || buffer[0] == 0)
710 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
711 transport_rcpt_address(addr, include_affixes));
715 /* Handle SMTP permanent and temporary response codes. */
720 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
721 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
722 host->name, host->address, string_printing(buffer));
723 setflag(addr, af_pass_message);
724 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
726 /* The response was 5xx */
728 if (buffer[0] == '5')
730 addr->transport_return = FAIL;
734 /* The response was 4xx */
738 addr->transport_return = DEFER;
739 addr->basic_errno = ERRNO_RCPT4XX;
740 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
742 /* Log temporary errors if there are more hosts to be tried. */
744 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
746 /* Do not put this message on the list of those waiting for specific
747 hosts, as otherwise it is likely to be tried too often. */
749 update_waiting = FALSE;
751 /* Add a retry item for the address so that it doesn't get tried again
752 too soon. If address_retry_include_sender is true, add the sender address
755 if (address_retry_include_sender)
757 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
759 retry_add_item(addr, altkey, 0);
761 else retry_add_item(addr, addr->address_retry_key, 0);
764 } /* Loop for next RCPT response */
766 /* Update where to start at for the next block of responses, unless we
767 have already handled all the addresses. */
769 if (addr != NULL) *sync_addr = addr->next;
771 /* Handle a response to DATA. If we have not had any good recipients, either
772 previously or in this block, the response is ignored. */
774 if (pending_DATA != 0 &&
775 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
780 if (pending_DATA > 0 || (yield & 1) != 0)
782 if (errno == 0 && buffer[0] == '4')
784 errno = ERRNO_DATA4XX;
785 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
789 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
790 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
791 "is in use and there were no good recipients\n", msg);
794 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
795 present) received 3xx. If any RCPTs were handled and yielded anything other
796 than 4xx, yield will be set non-zero. */
803 /*************************************************
804 * Deliver address list to given host *
805 *************************************************/
807 /* If continue_hostname is not null, we get here only when continuing to
808 deliver down an existing channel. The channel was passed as the standard
809 input. TLS is never active on a passed channel; the previous process always
810 closes it down before passing the connection on.
812 Otherwise, we have to make a connection to the remote host, and do the
813 initial protocol exchange.
815 When running as an MUA wrapper, if the sender or any recipient is rejected,
816 temporarily or permanently, we force failure for all recipients.
819 addrlist chain of potential addresses to deliver; only those whose
820 transport_return field is set to PENDING_DEFER are currently
821 being processed; others should be skipped - they have either
822 been delivered to an earlier host or IP address, or been
823 failed by one of them.
824 host host to deliver to
825 host_af AF_INET or AF_INET6
826 port default TCP/IP port to use, in host byte order
827 interface interface to bind to, or NULL
828 tblock transport instance block
829 copy_host TRUE if host set in addr->host_used must be copied, because
830 it is specific to this call of the transport
831 message_defer set TRUE if yield is OK, but all addresses were deferred
832 because of a non-recipient, non-host failure, that is, a
833 4xx response to MAIL FROM, DATA, or ".". This is a defer
834 that is specific to the message.
835 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
836 a second attempt after TLS initialization fails
838 Returns: OK - the connection was made and the delivery attempted;
839 the result for each address is in its data block.
840 DEFER - the connection could not be made, or something failed
841 while setting up the SMTP session, or there was a
842 non-message-specific error, such as a timeout.
843 ERROR - a filter command is specified for this transport,
844 and there was a problem setting it up; OR helo_data
845 or add_headers or authenticated_sender is specified
846 for this transport, and the string failed to expand
850 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
851 uschar *interface, transport_instance *tblock, BOOL copy_host,
852 BOOL *message_defer, BOOL suppress_tls)
855 address_item *sync_addr;
856 address_item *first_addr = addrlist;
861 time_t start_delivery_time = time(NULL);
862 smtp_transport_options_block *ob =
863 (smtp_transport_options_block *)(tblock->options_block);
864 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
865 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
867 BOOL send_rset = TRUE;
868 BOOL send_quit = TRUE;
869 BOOL setting_up = TRUE;
870 BOOL completed_address = FALSE;
873 BOOL pass_message = FALSE;
874 smtp_inblock inblock;
875 smtp_outblock outblock;
876 int max_rcpt = tblock->max_addresses;
877 uschar *igquotstr = US"";
878 uschar *local_authenticated_sender = authenticated_sender;
879 uschar *helo_data = NULL;
880 uschar *message = NULL;
881 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
884 uschar inbuffer[4096];
885 uschar outbuffer[1024];
887 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
889 *message_defer = FALSE;
890 smtp_command = US"initial connection";
891 if (max_rcpt == 0) max_rcpt = 999999;
893 /* Set up the buffer for reading SMTP response packets. */
895 inblock.buffer = inbuffer;
896 inblock.buffersize = sizeof(inbuffer);
897 inblock.ptr = inbuffer;
898 inblock.ptrend = inbuffer;
900 /* Set up the buffer for holding SMTP commands while pipelining */
902 outblock.buffer = outbuffer;
903 outblock.buffersize = sizeof(outbuffer);
904 outblock.ptr = outbuffer;
905 outblock.cmd_count = 0;
906 outblock.authenticating = FALSE;
908 /* Reset the parameters of a TLS session. */
911 tls_in.cipher = NULL; /* for back-compatible behaviour */
912 tls_in.peerdn = NULL;
913 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
918 tls_out.cipher = NULL; /* the one we may use for this transport */
919 tls_out.peerdn = NULL;
920 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
927 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
932 /* Make a connection to the host if this isn't a continued delivery, and handle
933 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
934 specially so they can be identified for retries. */
936 if (continue_hostname == NULL)
938 inblock.sock = outblock.sock =
939 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
940 ob->keepalive, ob->dscp); /* This puts port into host->port */
942 if (inblock.sock < 0)
944 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
949 /* Expand the greeting message while waiting for the initial response. (Makes
950 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
951 delayed till here so that $sending_interface and $sending_port are set. */
953 helo_data = expand_string(ob->helo_data);
955 /* The first thing is to wait for an initial OK response. The dreaded "goto"
956 is nevertheless a reasonably clean way of programming this kind of logic,
957 where you want to escape on any error. */
961 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
962 ob->command_timeout)) goto RESPONSE_FAILED;
964 /* Now check if the helo_data expansion went well, and sign off cleanly if
967 if (helo_data == NULL)
969 uschar *message = string_sprintf("failed to expand helo_data: %s",
970 expand_string_message);
971 set_errno(addrlist, 0, message, DEFER, FALSE);
977 /** Debugging without sending a message
978 addrlist->transport_return = DEFER;
982 /* Errors that occur after this point follow an SMTP command, which is
983 left in big_buffer by smtp_write_command() for use in error messages. */
985 smtp_command = big_buffer;
987 /* Tell the remote who we are...
989 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
990 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
991 greeting is of this form. The assumption was that the far end supports it
992 properly... but experience shows that there are some that give 5xx responses,
993 even though the banner includes "ESMTP" (there's a bloody-minded one that
994 says "ESMTP not spoken here"). Cope with that case.
996 September 2000: Time has passed, and it seems reasonable now to always send
997 EHLO at the start. It is also convenient to make the change while installing
1000 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1001 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1002 would be no way to send out the mails, so there is now a host list
1003 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1004 PIPELINING problem as well. Maybe it can also be useful to cure other
1005 problems with broken servers.
1007 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1008 Then somebody tried it with a Microsoft mailer... It seems that all other
1009 mailers use upper case for some reason (the RFC is quite clear about case
1010 independence) so, for peace of mind, I gave in. */
1012 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1013 host->name, host->address, NULL) != OK;
1015 /* Alas; be careful, since this goto is not an error-out, so conceivably
1016 we might set data between here and the target which we assume to exist
1017 and be usable. I can see this coming back to bite us. */
1022 suppress_tls = FALSE;
1023 ob->tls_tempfail_tryclear = FALSE;
1024 smtp_command = US"SSL-on-connect";
1031 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1032 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1034 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1035 ob->command_timeout))
1037 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1044 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1049 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1051 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1052 ob->command_timeout)) goto RESPONSE_FAILED;
1055 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1056 lmtp_ignore_quota option was set. */
1058 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1059 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1060 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1062 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1065 tls_offered = esmtp &&
1066 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1067 PCRE_EOPT, NULL, 0) >= 0;
1071 /* For continuing deliveries down the same channel, the socket is the standard
1072 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1073 below). Set up the pointer to where subsequent commands will be left, for
1074 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1075 set from the command line if they were set in the process that passed the
1080 inblock.sock = outblock.sock = fileno(stdin);
1081 smtp_command = big_buffer;
1082 host->port = port; /* Record the port that was used */
1085 /* If TLS is available on this connection, whether continued or not, attempt to
1086 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1087 send another EHLO - the server may give a different answer in secure mode. We
1088 use a separate buffer for reading the response to STARTTLS so that if it is
1089 negative, the original EHLO data is available for subsequent analysis, should
1090 the client not be required to use TLS. If the response is bad, copy the buffer
1091 for error analysis. */
1094 if (tls_offered && !suppress_tls &&
1095 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1096 host->address, NULL) != OK)
1098 uschar buffer2[4096];
1099 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1102 /* If there is an I/O error, transmission of this message is deferred. If
1103 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1104 false, we also defer. However, if there is a temporary rejection of STARTTLS
1105 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1106 STARTTLS, we carry on. This means we will try to send the message in clear,
1107 unless the host is in hosts_require_tls (tested below). */
1109 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1110 ob->command_timeout))
1112 if (errno != 0 || buffer2[0] == 0 ||
1113 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1115 Ustrncpy(buffer, buffer2, sizeof(buffer));
1116 goto RESPONSE_FAILED;
1120 /* STARTTLS accepted: try to negotiate a TLS session. */
1125 int rc = tls_client_start(inblock.sock,
1128 NULL, /* No DH param */
1129 ob->tls_certificate,
1132 ob->tls_verify_certificates,
1134 ob->tls_require_ciphers,
1135 ob->tls_dh_min_bits,
1136 ob->command_timeout);
1138 /* TLS negotiation failed; give an error. From outside, this function may
1139 be called again to try in clear on a new connection, if the options permit
1140 it for this host. */
1144 save_errno = ERRNO_TLSFAILURE;
1145 message = US"failure while setting up TLS session";
1150 /* TLS session is set up */
1152 for (addr = addrlist; addr != NULL; addr = addr->next)
1154 if (addr->transport_return == PENDING_DEFER)
1156 addr->cipher = tls_out.cipher;
1157 addr->peerdn = tls_out.peerdn;
1163 /* if smtps, we'll have smtp_command set to something else; always safe to
1165 smtp_command = big_buffer;
1167 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1168 helo_data is null, we are dealing with a connection that was passed from
1169 another process, and so we won't have expanded helo_data above. We have to
1170 expand it here. $sending_ip_address and $sending_port are set up right at the
1171 start of the Exim process (in exim.c). */
1173 if (tls_out.active >= 0)
1176 if (helo_data == NULL)
1178 helo_data = expand_string(ob->helo_data);
1179 if (helo_data == NULL)
1181 uschar *message = string_sprintf("failed to expand helo_data: %s",
1182 expand_string_message);
1183 set_errno(addrlist, 0, message, DEFER, FALSE);
1189 /* For SMTPS we need to wait for the initial OK response. */
1192 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1193 ob->command_timeout)) goto RESPONSE_FAILED;
1197 greeting_cmd = "EHLO";
1200 greeting_cmd = "HELO";
1202 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1205 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1206 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1208 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1209 ob->command_timeout))
1210 goto RESPONSE_FAILED;
1213 /* If the host is required to use a secure channel, ensure that we
1216 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1217 host->address, NULL) == OK)
1219 save_errno = ERRNO_TLSREQUIRED;
1220 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1221 host->name, host->address,
1222 tls_offered? "an attempt to start TLS failed" :
1223 "the server did not offer TLS support");
1228 /* If TLS is active, we have just started it up and re-done the EHLO command,
1229 so its response needs to be analyzed. If TLS is not active and this is a
1230 continued session down a previously-used socket, we haven't just done EHLO, so
1233 if (continue_hostname == NULL
1235 || tls_out.active >= 0
1240 uschar *fail_reason = US"server did not advertise AUTH support";
1242 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1243 lmtp_ignore_quota option was set. */
1245 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1246 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1247 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1249 /* If the response to EHLO specified support for the SIZE parameter, note
1250 this, provided size_addition is non-negative. */
1252 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1253 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1254 PCRE_EOPT, NULL, 0) >= 0;
1256 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1257 the current host, esmtp will be false, so PIPELINING can never be used. If
1258 the current host matches hosts_avoid_pipelining, don't do it. */
1260 smtp_use_pipelining = esmtp &&
1261 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1262 host->address, NULL) != OK &&
1263 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1264 PCRE_EOPT, NULL, 0) >= 0;
1266 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1267 smtp_use_pipelining? "" : "not ");
1269 /* Note if the response to EHLO specifies support for the AUTH extension.
1270 If it has, check that this host is one we want to authenticate to, and do
1271 the business. The host name and address must be available when the
1272 authenticator's client driver is running. */
1274 smtp_authenticated = FALSE;
1275 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1276 host->name, host->address, NULL);
1278 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1280 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1281 expand_nmax = -1; /* reset */
1283 /* Must not do this check until after we have saved the result of the
1284 regex match above. */
1286 if (require_auth == OK ||
1287 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1288 host->address, NULL) == OK)
1291 fail_reason = US"no common mechanisms were found";
1293 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1295 /* Scan the configured authenticators looking for one which is configured
1296 for use as a client, which is not suppressed by client_condition, and
1297 whose name matches an authentication mechanism supported by the server.
1298 If one is found, attempt to authenticate by calling its client function.
1301 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1305 (au->client_condition != NULL &&
1306 !expand_check_condition(au->client_condition, au->name,
1307 US"client authenticator")))
1309 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1311 (au->client)? "client_condition is false" :
1312 "not configured as a client");
1316 /* Loop to scan supported server mechanisms */
1321 int len = Ustrlen(au->public_name);
1322 while (isspace(*p)) p++;
1324 if (strncmpic(au->public_name, p, len) != 0 ||
1325 (p[len] != 0 && !isspace(p[len])))
1327 while (*p != 0 && !isspace(*p)) p++;
1331 /* Found data for a listed mechanism. Call its client entry. Set
1332 a flag in the outblock so that data is overwritten after sending so
1333 that reflections don't show it. */
1335 fail_reason = US"authentication attempt(s) failed";
1336 outblock.authenticating = TRUE;
1337 rc = (au->info->clientcode)(au, &inblock, &outblock,
1338 ob->command_timeout, buffer, sizeof(buffer));
1339 outblock.authenticating = FALSE;
1340 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1343 /* A temporary authentication failure must hold up delivery to
1344 this host. After a permanent authentication failure, we carry on
1345 to try other authentication methods. If all fail hard, try to
1346 deliver the message unauthenticated unless require_auth was set. */
1351 smtp_authenticated = TRUE; /* stops the outer loop */
1352 client_authenticator = au->name;
1353 if (au->set_client_id != NULL)
1354 client_authenticated_id = expand_string(au->set_client_id);
1357 /* Failure after writing a command */
1362 /* Failure after reading a response */
1365 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1366 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1367 au->name, host->name, host->address, buffer);
1370 /* Failure by some other means. In effect, the authenticator
1371 decided it wasn't prepared to handle this case. Typically this
1372 is the result of "fail" in an expansion string. Do we need to
1373 log anything here? Feb 2006: a message is now put in the buffer
1374 if logging is required. */
1378 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1379 "authentication H=%s [%s] %s", au->name, host->name,
1380 host->address, buffer);
1383 /* Internal problem, message in buffer. */
1387 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1391 break; /* If not authenticated, try next authenticator */
1392 } /* Loop for scanning supported server mechanisms */
1393 } /* Loop for further authenticators */
1397 /* If we haven't authenticated, but are required to, give up. */
1399 if (require_auth == OK && !smtp_authenticated)
1402 set_errno(addrlist, ERRNO_AUTHFAIL,
1403 string_sprintf("authentication required but %s", fail_reason), DEFER,
1409 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1410 message-specific. */
1414 /* If there is a filter command specified for this transport, we can now
1415 set it up. This cannot be done until the identify of the host is known. */
1417 if (tblock->filter_command != NULL)
1421 sprintf(CS buffer, "%.50s transport", tblock->name);
1422 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1423 TRUE, DEFER, addrlist, buffer, NULL);
1424 transport_filter_timeout = tblock->filter_timeout;
1426 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1431 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1439 /* For messages that have more than the maximum number of envelope recipients,
1440 we want to send several transactions down the same SMTP connection. (See
1441 comments in deliver.c as to how this reconciles, heuristically, with
1442 remote_max_parallel.) This optimization was added to Exim after the following
1443 code was already working. The simplest way to put it in without disturbing the
1444 code was to use a goto to jump back to this point when there is another
1445 transaction to handle. */
1448 sync_addr = first_addr;
1452 completed_address = FALSE;
1455 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1456 qualification, send it, adding something to the message size to allow for
1457 imprecision and things that get added en route. Exim keeps the number of lines
1458 in a message, so we can give an accurate value for the original message, but we
1459 need some additional to handle added headers. (Double "." characters don't get
1460 included in the count.) */
1467 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1471 /* If an authenticated_sender override has been specified for this transport
1472 instance, expand it. If the expansion is forced to fail, and there was already
1473 an authenticated_sender for this message, the original value will be used.
1474 Other expansion failures are serious. An empty result is ignored, but there is
1475 otherwise no check - this feature is expected to be used with LMTP and other
1476 cases where non-standard addresses (e.g. without domains) might be required. */
1478 if (ob->authenticated_sender != NULL)
1480 uschar *new = expand_string(ob->authenticated_sender);
1483 if (!expand_string_forcedfail)
1485 uschar *message = string_sprintf("failed to expand "
1486 "authenticated_sender: %s", expand_string_message);
1487 set_errno(addrlist, 0, message, DEFER, FALSE);
1491 else if (new[0] != 0) local_authenticated_sender = new;
1494 /* Add the authenticated sender address if present */
1496 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1497 local_authenticated_sender != NULL)
1499 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1500 auth_xtextencode(local_authenticated_sender,
1501 Ustrlen(local_authenticated_sender)));
1502 client_authenticated_sender = string_copy(local_authenticated_sender);
1505 client_authenticated_sender = NULL;
1507 /* From here until we send the DATA command, we can make use of PIPELINING
1508 if the server host supports it. The code has to be able to check the responses
1509 at any point, for when the buffer fills up, so we write it totally generally.
1510 When PIPELINING is off, each command written reports that it has flushed the
1513 pending_MAIL = TRUE; /* The block starts with MAIL */
1515 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1516 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1517 mail_command = string_copy(big_buffer); /* Save for later error message */
1521 case -1: /* Transmission error */
1524 case +1: /* Block was sent */
1525 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1526 ob->command_timeout))
1528 if (errno == 0 && buffer[0] == '4')
1530 errno = ERRNO_MAIL4XX;
1531 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1533 goto RESPONSE_FAILED;
1535 pending_MAIL = FALSE;
1539 /* Pass over all the relevant recipient addresses for this host, which are the
1540 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1541 several before we have to read the responses for those seen so far. This
1542 checking is done by a subroutine because it also needs to be done at the end.
1543 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1544 the next one if not all are sent.
1546 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1547 last address because we want to abort if any recipients have any kind of
1548 problem, temporary or permanent. We know that all recipient addresses will have
1549 the PENDING_DEFER status, because only one attempt is ever made, and we know
1550 that max_rcpt will be large, so all addresses will be done at once. */
1552 for (addr = first_addr;
1553 address_count < max_rcpt && addr != NULL;
1559 if (addr->transport_return != PENDING_DEFER) continue;
1562 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1564 /* Now send the RCPT command, and process outstanding responses when
1565 necessary. After a timeout on RCPT, we just end the function, leaving the
1566 yield as OK, because this error can often mean that there is a problem with
1567 just one address, so we don't want to delay the host. */
1569 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1570 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1571 if (count < 0) goto SEND_FAILED;
1574 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1575 &sync_addr, host, count, ob->address_retry_include_sender,
1576 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1579 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1580 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1583 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1584 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1585 case 0: /* No 2xx or 5xx, but no probs */
1588 case -1: goto END_OFF; /* Timeout on RCPT */
1589 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1591 pending_MAIL = FALSE; /* Dealt with MAIL */
1593 } /* Loop for next address */
1595 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1596 permanently or temporarily. We should have flushed and synced after the last
1601 address_item *badaddr;
1602 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1604 if (badaddr->transport_return != PENDING_OK) break;
1606 if (badaddr != NULL)
1608 set_errno(addrlist, 0, badaddr->message, FAIL,
1609 testflag(badaddr, af_pass_message));
1614 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1615 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1616 have a good recipient buffered up if we are pipelining. We don't want to waste
1617 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1618 are pipelining. The responses are all handled by sync_responses(). */
1620 if (ok || (smtp_use_pipelining && !mua_wrapper))
1622 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1623 if (count < 0) goto SEND_FAILED;
1624 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1625 host, count, ob->address_retry_include_sender, pending_MAIL,
1626 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1628 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1629 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1632 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1633 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1634 case 0: break; /* No 2xx or 5xx, but no probs */
1636 case -1: goto END_OFF; /* Timeout on RCPT */
1637 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1641 /* Save the first address of the next batch. */
1645 /* If there were no good recipients (but otherwise there have been no
1646 problems), just set ok TRUE, since we have handled address-specific errors
1647 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1648 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1649 well as body. Set the appropriate timeout value to be used for each chunk.
1650 (Haven't been able to make it work using select() for writing yet.) */
1652 if (!ok) ok = TRUE; else
1654 sigalrm_seen = FALSE;
1655 transport_write_timeout = ob->data_timeout;
1656 smtp_command = US"sending data block"; /* For error messages */
1657 DEBUG(D_transport|D_v)
1658 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1659 transport_count = 0;
1660 #ifndef DISABLE_DKIM
1661 ok = dkim_transport_write_message(addrlist, inblock.sock,
1662 topt_use_crlf | topt_end_dot | topt_escape_headers |
1663 (tblock->body_only? topt_no_headers : 0) |
1664 (tblock->headers_only? topt_no_body : 0) |
1665 (tblock->return_path_add? topt_add_return_path : 0) |
1666 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1667 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1668 0, /* No size limit */
1669 tblock->add_headers, tblock->remove_headers,
1670 US".", US"..", /* Escaping strings */
1671 tblock->rewrite_rules, tblock->rewrite_existflags,
1672 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1673 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1676 ok = transport_write_message(addrlist, inblock.sock,
1677 topt_use_crlf | topt_end_dot | topt_escape_headers |
1678 (tblock->body_only? topt_no_headers : 0) |
1679 (tblock->headers_only? topt_no_body : 0) |
1680 (tblock->return_path_add? topt_add_return_path : 0) |
1681 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1682 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1683 0, /* No size limit */
1684 tblock->add_headers, tblock->remove_headers,
1685 US".", US"..", /* Escaping strings */
1686 tblock->rewrite_rules, tblock->rewrite_existflags);
1689 /* transport_write_message() uses write() because it is called from other
1690 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1691 it can exit with "Broken pipe" as its error. This really means that the
1692 socket got closed at the far end. */
1694 transport_write_timeout = 0; /* for subsequent transports */
1696 /* Failure can either be some kind of I/O disaster (including timeout),
1697 or the failure of a transport filter or the expansion of added headers. */
1701 buffer[0] = 0; /* There hasn't been a response */
1702 goto RESPONSE_FAILED;
1705 /* We used to send the terminating "." explicitly here, but because of
1706 buffering effects at both ends of TCP/IP connections, you don't gain
1707 anything by keeping it separate, so it might as well go in the final
1708 data buffer for efficiency. This is now done by setting the topt_end_dot
1711 smtp_command = US"end of data";
1713 /* For SMTP, we now read a single response that applies to the whole message.
1714 If it is OK, then all the addresses have been delivered. */
1718 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1720 if (!ok && errno == 0 && buffer[0] == '4')
1722 errno = ERRNO_DATA4XX;
1723 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1727 /* For LMTP, we get back a response for every RCPT command that we sent;
1728 some may be accepted and some rejected. For those that get a response, their
1729 status is fixed; any that are accepted have been handed over, even if later
1730 responses crash - at least, that's how I read RFC 2033.
1732 If all went well, mark the recipient addresses as completed, record which
1733 host/IPaddress they were delivered to, and cut out RSET when sending another
1734 message down the same channel. Write the completed addresses to the journal
1735 now so that they are recorded in case there is a crash of hardware or
1736 software before the spool gets updated. Also record the final SMTP
1737 confirmation if needed (for SMTP only). */
1742 int delivery_time = (int)(time(NULL) - start_delivery_time);
1745 uschar *conf = NULL;
1748 /* Make a copy of the host if it is local to this invocation
1749 of the transport. */
1753 thost = store_get(sizeof(host_item));
1755 thost->name = string_copy(host->name);
1756 thost->address = string_copy(host->address);
1760 /* Set up confirmation if needed - applies only to SMTP */
1762 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1764 uschar *s = string_printing(buffer);
1765 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1768 /* Process all transported addresses - for LMTP, read a status for
1771 for (addr = addrlist; addr != first_addr; addr = addr->next)
1773 if (addr->transport_return != PENDING_OK) continue;
1775 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1776 remaining addresses. Otherwise, it's a return code for just the one
1777 address. For temporary errors, add a retry item for the address so that
1778 it doesn't get tried again too soon. */
1782 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1785 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1786 addr->message = string_sprintf("LMTP error after %s: %s",
1787 big_buffer, string_printing(buffer));
1788 setflag(addr, af_pass_message); /* Allow message to go to user */
1789 if (buffer[0] == '5')
1790 addr->transport_return = FAIL;
1793 errno = ERRNO_DATA4XX;
1794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1795 addr->transport_return = DEFER;
1796 retry_add_item(addr, addr->address_retry_key, 0);
1800 completed_address = TRUE; /* NOW we can set this flag */
1801 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1803 uschar *s = string_printing(buffer);
1804 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1808 /* SMTP, or success return from LMTP for this address. Pass back the
1809 actual host that was used. */
1811 addr->transport_return = OK;
1812 addr->more_errno = delivery_time;
1813 addr->host_used = thost;
1814 addr->special_action = flag;
1815 addr->message = conf;
1818 /* Update the journal. For homonymic addresses, use the base address plus
1819 the transport name. See lots of comments in deliver.c about the reasons
1820 for the complications when homonyms are involved. Just carry on after
1821 write error, as it may prove possible to update the spool file later. */
1823 if (testflag(addr, af_homonym))
1824 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1826 sprintf(CS buffer, "%.500s\n", addr->unique);
1828 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1829 len = Ustrlen(CS buffer);
1830 if (write(journal_fd, buffer, len) != len)
1831 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1832 "%s: %s", buffer, strerror(errno));
1835 /* Ensure the journal file is pushed out to disk. */
1837 if (EXIMfsync(journal_fd) < 0)
1838 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1844 /* Handle general (not specific to one address) failures here. The value of ok
1845 is used to skip over this code on the falling through case. A timeout causes a
1846 deferral. Other errors may defer or fail according to the response code, and
1847 may set up a special errno value, e.g. after connection chopped, which is
1848 assumed if errno == 0 and there is no text in the buffer. If control reaches
1849 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1850 the problem is not related to this specific message. */
1859 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1860 buffer, &code, &message, &pass_message);
1866 message = US string_sprintf("send() to %s [%s] failed: %s",
1867 host->name, host->address, strerror(save_errno));
1871 /* This label is jumped to directly when a TLS negotiation has failed,
1872 or was not done for a host for which it is required. Values will be set
1873 in message and save_errno, and setting_up will always be true. Treat as
1874 a temporary error. */
1881 /* If the failure happened while setting up the call, see if the failure was
1882 a 5xx response (this will either be on connection, or following HELO - a 5xx
1883 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1884 never going to accept them. For other errors during setting up (timeouts or
1885 whatever), defer all addresses, and yield DEFER, so that the host is not
1886 tried again for a while. */
1889 ok = FALSE; /* For when reached by GOTO */
1895 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1899 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1904 /* We want to handle timeouts after MAIL or "." and loss of connection after
1905 "." specially. They can indicate a problem with the sender address or with
1906 the contents of the message rather than a real error on the connection. These
1907 cases are treated in the same way as a 4xx response. This next bit of code
1908 does the classification. */
1919 message_error = TRUE;
1923 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1924 Ustrncmp(smtp_command,"end ",4) == 0;
1927 case ERRNO_SMTPCLOSED:
1928 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1932 message_error = FALSE;
1936 /* Handle the cases that are treated as message errors. These are:
1938 (a) negative response or timeout after MAIL
1939 (b) negative response after DATA
1940 (c) negative response or timeout or dropped connection after "."
1942 It won't be a negative response or timeout after RCPT, as that is dealt
1943 with separately above. The action in all cases is to set an appropriate
1944 error code for all the addresses, but to leave yield set to OK because the
1945 host itself has not failed. Of course, it might in practice have failed
1946 when we've had a timeout, but if so, we'll discover that at the next
1947 delivery attempt. For a temporary error, set the message_defer flag, and
1948 write to the logs for information if this is not the last host. The error
1949 for the last host will be logged as part of the address's log line. */
1953 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1954 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1957 /* If there's an errno, the message contains just the identity of
1960 if (code != '5') /* Anything other than 5 is treated as temporary */
1963 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1964 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1965 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1966 *message_defer = TRUE;
1970 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1971 ".", or some other transportation error. We defer all addresses and yield
1972 DEFER, except for the case of failed add_headers expansion, or a transport
1973 filter failure, when the yield should be ERROR, to stop it trying other
1978 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1979 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1980 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1986 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1987 SMTP session tidily. However, if there were too many addresses to send in one
1988 message (indicated by first_addr being non-NULL) we want to carry on with the
1989 rest of them. Also, it is desirable to send more than one message down the SMTP
1990 connection if there are several waiting, provided we haven't already sent so
1991 many as to hit the configured limit. The function transport_check_waiting looks
1992 for a waiting message and returns its id. Then transport_pass_socket tries to
1993 set up a continued delivery by passing the socket on to another process. The
1994 variable send_rset is FALSE if a message has just been successfully transfered.
1996 If we are already sending down a continued channel, there may be further
1997 addresses not yet delivered that are aimed at the same host, but which have not
1998 been passed in this run of the transport. In this case, continue_more will be
1999 true, and all we should do is send RSET if necessary, and return, leaving the
2002 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2003 do not want to continue with other messages down the same channel, because that
2004 can lead to looping between two or more messages, all with the same,
2005 temporarily failing address(es). [The retry information isn't updated yet, so
2006 new processes keep on trying.] We probably also don't want to try more of this
2007 message's addresses either.
2009 If we have started a TLS session, we have to end it before passing the
2010 connection to a new process. However, not all servers can handle this (Exim
2011 can), so we do not pass such a connection on if the host matches
2012 hosts_nopass_tls. */
2015 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2016 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2017 continue_more, yield, (first_addr == NULL)? "":"not ");
2019 if (completed_address && ok && send_quit)
2022 if (first_addr != NULL || continue_more ||
2024 (tls_out.active < 0 ||
2025 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2026 host->address, NULL) != OK)
2028 transport_check_waiting(tblock->name, host->name,
2029 tblock->connection_max_messages, new_message_id, &more)
2037 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2039 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2040 host->address, strerror(save_errno));
2043 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2044 ob->command_timeout)))
2047 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2051 DEBUG(D_transport) debug_printf("%s\n", msg);
2056 /* Either RSET was not needed, or it succeeded */
2060 if (first_addr != NULL) /* More addresses still to be sent */
2061 { /* in this run of the transport */
2062 continue_sequence++; /* Causes * in logging */
2065 if (continue_more) return yield; /* More addresses for another run */
2067 /* Pass the socket to a new Exim process. Before doing so, we must shut
2068 down TLS. Not all MTAs allow for the continuation of the SMTP session
2069 when TLS is shut down. We test for this by sending a new EHLO. If we
2070 don't get a good response, we don't attempt to pass the socket on. */
2073 if (tls_out.active >= 0)
2075 tls_close(FALSE, TRUE);
2079 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2080 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2081 ob->command_timeout);
2085 /* If the socket is successfully passed, we musn't send QUIT (or
2086 indeed anything!) from here. */
2088 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2089 new_message_id, inblock.sock))
2095 /* If RSET failed and there are addresses left, they get deferred. */
2097 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2101 /* End off tidily with QUIT unless the connection has died or the socket has
2102 been passed to another process. There has been discussion on the net about what
2103 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2104 to wait for a response, but on the other hand, there isn't anything one can do
2105 with an error response, other than log it. Exim used to do that. However,
2106 further discussion suggested that it is positively advantageous not to wait for
2107 the response, but to close the session immediately. This is supposed to move
2108 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2109 load from the server. (Hosts that are both servers and clients may not see much
2110 difference, of course.) Further discussion indicated that this was safe to do
2111 on Unix systems which have decent implementations of TCP/IP that leave the
2112 connection around for a while (TIME_WAIT) after the application has gone away.
2113 This enables the response sent by the server to be properly ACKed rather than
2114 timed out, as can happen on broken TCP/IP implementations on other OS.
2116 This change is being made on 31-Jul-98. After over a year of trouble-free
2117 operation, the old commented-out code was removed on 17-Sep-99. */
2120 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2125 tls_close(FALSE, TRUE);
2128 /* Close the socket, and return the appropriate value, first setting
2129 continue_transport and continue_hostname NULL to prevent any other addresses
2130 that may include the host from trying to re-use a continuation socket. This
2131 works because the NULL setting is passed back to the calling process, and
2132 remote_max_parallel is forced to 1 when delivering over an existing connection,
2134 If all went well and continue_more is set, we shouldn't actually get here if
2135 there are further addresses, as the return above will be taken. However,
2136 writing RSET might have failed, or there may be other addresses whose hosts are
2137 specified in the transports, and therefore not visible at top level, in which
2138 case continue_more won't get set. */
2140 (void)close(inblock.sock);
2141 continue_transport = NULL;
2142 continue_hostname = NULL;
2149 /*************************************************
2150 * Closedown entry point *
2151 *************************************************/
2153 /* This function is called when exim is passed an open smtp channel
2154 from another incarnation, but the message which it has been asked
2155 to deliver no longer exists. The channel is on stdin.
2157 We might do fancy things like looking for another message to send down
2158 the channel, but if the one we sought has gone, it has probably been
2159 delivered by some other process that itself will seek further messages,
2160 so just close down our connection.
2162 Argument: pointer to the transport instance block
2167 smtp_transport_closedown(transport_instance *tblock)
2169 smtp_transport_options_block *ob =
2170 (smtp_transport_options_block *)(tblock->options_block);
2171 smtp_inblock inblock;
2172 smtp_outblock outblock;
2174 uschar inbuffer[4096];
2175 uschar outbuffer[16];
2177 inblock.sock = fileno(stdin);
2178 inblock.buffer = inbuffer;
2179 inblock.buffersize = sizeof(inbuffer);
2180 inblock.ptr = inbuffer;
2181 inblock.ptrend = inbuffer;
2183 outblock.sock = inblock.sock;
2184 outblock.buffersize = sizeof(outbuffer);
2185 outblock.buffer = outbuffer;
2186 outblock.ptr = outbuffer;
2187 outblock.cmd_count = 0;
2188 outblock.authenticating = FALSE;
2190 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2191 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2192 ob->command_timeout);
2193 (void)close(inblock.sock);
2198 /*************************************************
2199 * Prepare addresses for delivery *
2200 *************************************************/
2202 /* This function is called to flush out error settings from previous delivery
2203 attempts to other hosts. It also records whether we got here via an MX record
2204 or not in the more_errno field of the address. We are interested only in
2205 addresses that are still marked DEFER - others may have got delivered to a
2206 previously considered IP address. Set their status to PENDING_DEFER to indicate
2207 which ones are relevant this time.
2210 addrlist the list of addresses
2211 host the host we are delivering to
2213 Returns: the first address for this delivery
2216 static address_item *
2217 prepare_addresses(address_item *addrlist, host_item *host)
2219 address_item *first_addr = NULL;
2221 for (addr = addrlist; addr != NULL; addr = addr->next)
2223 if (addr->transport_return != DEFER) continue;
2224 if (first_addr == NULL) first_addr = addr;
2225 addr->transport_return = PENDING_DEFER;
2226 addr->basic_errno = 0;
2227 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2228 addr->message = NULL;
2230 addr->cipher = NULL;
2231 addr->peerdn = NULL;
2239 /*************************************************
2240 * Main entry point *
2241 *************************************************/
2243 /* See local README for interface details. As this is a remote transport, it is
2244 given a chain of addresses to be delivered in one connection, if possible. It
2245 always returns TRUE, indicating that each address has its own independent
2246 status set, except if there is a setting up problem, in which case it returns
2250 smtp_transport_entry(
2251 transport_instance *tblock, /* data for this instantiation */
2252 address_item *addrlist) /* addresses we are working on */
2256 int hosts_defer = 0;
2258 int hosts_looked_up = 0;
2259 int hosts_retry = 0;
2260 int hosts_serial = 0;
2261 int hosts_total = 0;
2262 int total_hosts_tried = 0;
2264 BOOL expired = TRUE;
2265 BOOL continuing = continue_hostname != NULL;
2266 uschar *expanded_hosts = NULL;
2268 uschar *tid = string_sprintf("%s transport", tblock->name);
2269 smtp_transport_options_block *ob =
2270 (smtp_transport_options_block *)(tblock->options_block);
2271 host_item *hostlist = addrlist->host_list;
2272 host_item *host = NULL;
2276 debug_printf("%s transport entered\n", tblock->name);
2277 for (addr = addrlist; addr != NULL; addr = addr->next)
2278 debug_printf(" %s\n", addr->address);
2279 if (continuing) debug_printf("already connected to %s [%s]\n",
2280 continue_hostname, continue_host_address);
2283 /* Set the flag requesting that these hosts be added to the waiting
2284 database if the delivery fails temporarily or if we are running with
2285 queue_smtp or a 2-stage queue run. This gets unset for certain
2286 kinds of error, typically those that are specific to the message. */
2288 update_waiting = TRUE;
2290 /* If a host list is not defined for the addresses - they must all have the
2291 same one in order to be passed to a single transport - or if the transport has
2292 a host list with hosts_override set, use the host list supplied with the
2293 transport. It is an error for this not to exist. */
2295 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2297 if (ob->hosts == NULL)
2299 addrlist->message = string_sprintf("%s transport called with no hosts set",
2301 addrlist->transport_return = PANIC;
2302 return FALSE; /* Only top address has status */
2305 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2308 /* If the transport's host list contains no '$' characters, and we are not
2309 randomizing, it is fixed and therefore a chain of hosts can be built once
2310 and for all, and remembered for subsequent use by other calls to this
2311 transport. If, on the other hand, the host list does contain '$', or we are
2312 randomizing its order, we have to rebuild it each time. In the fixed case,
2313 as the hosts string will never be used again, it doesn't matter that we
2314 replace all the : characters with zeros. */
2316 if (ob->hostlist == NULL)
2318 uschar *s = ob->hosts;
2320 if (Ustrchr(s, '$') != NULL)
2322 expanded_hosts = expand_string(s);
2323 if (expanded_hosts == NULL)
2325 addrlist->message = string_sprintf("failed to expand list of hosts "
2326 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2327 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2328 return FALSE; /* Only top address has status */
2330 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2331 "\"%s\"\n", s, expanded_hosts);
2335 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2337 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2339 /* Check that the expansion yielded something useful. */
2340 if (hostlist == NULL)
2343 string_sprintf("%s transport has empty hosts setting", tblock->name);
2344 addrlist->transport_return = PANIC;
2345 return FALSE; /* Only top address has status */
2348 /* If there was no expansion of hosts, save the host list for
2351 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2354 /* This is not the first time this transport has been run in this delivery;
2355 the host list was built previously. */
2357 else hostlist = ob->hostlist;
2360 /* The host list was supplied with the address. If hosts_randomize is set, we
2361 must sort it into a random order if it did not come from MX records and has not
2362 already been randomized (but don't bother if continuing down an existing
2365 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2367 host_item *newlist = NULL;
2368 while (hostlist != NULL)
2370 host_item *h = hostlist;
2371 hostlist = hostlist->next;
2373 h->sort_key = random_number(100);
2375 if (newlist == NULL)
2380 else if (h->sort_key < newlist->sort_key)
2387 host_item *hh = newlist;
2388 while (hh->next != NULL)
2390 if (h->sort_key < hh->next->sort_key) break;
2398 hostlist = addrlist->host_list = newlist;
2402 /* Sort out the default port. */
2404 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2407 /* For each host-plus-IP-address on the list:
2409 . If this is a continued delivery and the host isn't the one with the
2410 current connection, skip.
2412 . If the status is unusable (i.e. previously failed or retry checked), skip.
2414 . If no IP address set, get the address, either by turning the name into
2415 an address, calling gethostbyname if gethostbyname is on, or by calling
2416 the DNS. The DNS may yield multiple addresses, in which case insert the
2417 extra ones into the list.
2419 . Get the retry data if not previously obtained for this address and set the
2420 field which remembers the state of this address. Skip if the retry time is
2421 not reached. If not, remember whether retry data was found. The retry string
2422 contains both the name and the IP address.
2424 . Scan the list of addresses and mark those whose status is DEFER as
2425 PENDING_DEFER. These are the only ones that will be processed in this cycle
2428 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2429 Some addresses may be successfully delivered, others may fail, and yet
2430 others may get temporary errors and so get marked DEFER.
2432 . The return from the delivery attempt is OK if a connection was made and a
2433 valid SMTP dialogue was completed. Otherwise it is DEFER.
2435 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2437 . If fail to connect, or other defer state, add a retry item.
2439 . If there are any addresses whose status is still DEFER, carry on to the
2440 next host/IPaddress, unless we have tried the number of hosts given
2441 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2442 there is some fancy logic for hosts_max_try that means its limit can be
2443 overstepped in some circumstances.
2445 If we get to the end of the list, all hosts have deferred at least one address,
2446 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2447 delivery attempt to those hosts whose last try was before the arrival time of
2448 the current message. To cope with this, we have to go round the loop a second
2449 time. After that, set the status and error data for any addresses that haven't
2450 had it set already. */
2452 for (cutoff_retry = 0; expired &&
2453 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2456 host_item *nexthost = NULL;
2457 int unexpired_hosts_tried = 0;
2459 for (host = hostlist;
2461 unexpired_hosts_tried < ob->hosts_max_try &&
2462 total_hosts_tried < ob->hosts_max_try_hardlimit;
2468 BOOL serialized = FALSE;
2469 BOOL host_is_expired = FALSE;
2470 BOOL message_defer = FALSE;
2471 BOOL ifchanges = FALSE;
2472 BOOL some_deferred = FALSE;
2473 address_item *first_addr = NULL;
2474 uschar *interface = NULL;
2475 uschar *retry_host_key = NULL;
2476 uschar *retry_message_key = NULL;
2477 uschar *serialize_key = NULL;
2479 /* Default next host is next host. :-) But this can vary if the
2480 hosts_max_try limit is hit (see below). It may also be reset if a host
2481 address is looked up here (in case the host was multihomed). */
2483 nexthost = host->next;
2485 /* If the address hasn't yet been obtained from the host name, look it up
2486 now, unless the host is already marked as unusable. If it is marked as
2487 unusable, it means that the router was unable to find its IP address (in
2488 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2489 the lookup failed last time. We don't get this far if *all* MX records
2490 point to non-existent hosts; that is treated as a hard error.
2492 We can just skip this host entirely. When the hosts came from the router,
2493 the address will timeout based on the other host(s); when the address is
2494 looked up below, there is an explicit retry record added.
2496 Note that we mustn't skip unusable hosts if the address is not unset; they
2497 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2499 if (host->address == NULL)
2501 int new_port, flags;
2503 uschar *canonical_name;
2505 if (host->status >= hstatus_unusable)
2507 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2512 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2514 /* The host name is permitted to have an attached port. Find it, and
2515 strip it from the name. Just remember it for now. */
2517 new_port = host_item_get_port(host);
2519 /* Count hosts looked up */
2523 /* Find by name if so configured, or if it's an IP address. We don't
2524 just copy the IP address, because we need the test-for-local to happen. */
2526 flags = HOST_FIND_BY_A;
2527 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2528 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2530 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2531 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2533 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2534 &canonical_name, NULL);
2536 /* Update the host (and any additional blocks, resulting from
2537 multihoming) with a host-specific port, if any. */
2539 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2541 /* Failure to find the host at this time (usually DNS temporary failure)
2542 is really a kind of routing failure rather than a transport failure.
2543 Therefore we add a retry item of the routing kind, not to stop us trying
2544 to look this name up here again, but to ensure the address gets timed
2545 out if the failures go on long enough. A complete failure at this point
2546 commonly points to a configuration error, but the best action is still
2547 to carry on for the next host. */
2549 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2551 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2553 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2554 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2555 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2556 host->status = hstatus_unusable;
2558 for (addr = addrlist; addr != NULL; addr = addr->next)
2560 if (addr->transport_return != DEFER) continue;
2561 addr->basic_errno = ERRNO_UNKNOWNHOST;
2563 string_sprintf("failed to lookup IP address for %s", host->name);
2568 /* If the host is actually the local host, we may have a problem, or
2569 there may be some cunning configuration going on. In the problem case,
2570 log things and give up. The default transport status is already DEFER. */
2572 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2574 for (addr = addrlist; addr != NULL; addr = addr->next)
2576 addr->basic_errno = 0;
2577 addr->message = string_sprintf("%s transport found host %s to be "
2578 "local", tblock->name, host->name);
2582 } /* End of block for IP address lookup */
2584 /* If this is a continued delivery, we are interested only in the host
2585 which matches the name of the existing open channel. The check is put
2586 here after the local host lookup, in case the name gets expanded as a
2587 result of the lookup. Set expired FALSE, to save the outer loop executing
2590 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2591 Ustrcmp(continue_host_address, host->address) != 0))
2594 continue; /* With next host */
2597 /* Reset the default next host in case a multihomed host whose addresses
2598 are not looked up till just above added to the host list. */
2600 nexthost = host->next;
2602 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2603 domain is in queue_smtp_domains, we don't actually want to attempt any
2604 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2605 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2606 were not in it. We don't want to hold up all SMTP deliveries! Except when
2607 doing a two-stage queue run, don't do this if forcing. */
2609 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2610 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2611 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2614 for (addr = addrlist; addr != NULL; addr = addr->next)
2616 if (addr->transport_return != DEFER) continue;
2617 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2619 continue; /* With next host */
2622 /* Count hosts being considered - purely for an intelligent comment
2623 if none are usable. */
2627 /* Set $host and $host address now in case they are needed for the
2628 interface expansion or the serialize_hosts check; they remain set if an
2629 actual delivery happens. */
2631 deliver_host = host->name;
2632 deliver_host_address = host->address;
2634 /* Set up a string for adding to the retry key if the port number is not
2635 the standard SMTP port. A host may have its own port setting that overrides
2638 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2640 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2642 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2643 string changes upon expansion, we must add it to the key that is used for
2644 retries, because connections to the same host from a different interface
2645 should be treated separately. */
2647 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2648 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2651 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2653 /* The first time round the outer loop, check the status of the host by
2654 inspecting the retry data. The second time round, we are interested only
2655 in expired hosts that haven't been tried since this message arrived. */
2657 if (cutoff_retry == 0)
2659 /* Ensure the status of the address is set by checking retry data if
2660 necessary. There maybe host-specific retry data (applicable to all
2661 messages) and also data for retries of a specific message at this host.
2662 If either of these retry records are actually read, the keys used are
2663 returned to save recomputing them later. */
2665 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2666 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2668 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2669 (host->address == NULL)? US"" : host->address, pistring,
2670 (host->status == hstatus_usable)? "usable" :
2671 (host->status == hstatus_unusable)? "unusable" :
2672 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2674 /* Skip this address if not usable at this time, noting if it wasn't
2675 actually expired, both locally and in the address. */
2677 switch (host->status)
2679 case hstatus_unusable:
2681 setflag(addrlist, af_retry_skipped);
2684 case hstatus_unusable_expired:
2687 case hwhy_retry: hosts_retry++; break;
2688 case hwhy_failed: hosts_fail++; break;
2689 case hwhy_deferred: hosts_defer++; break;
2692 /* If there was a retry message key, implying that previously there
2693 was a message-specific defer, we don't want to update the list of
2694 messages waiting for these hosts. */
2696 if (retry_message_key != NULL) update_waiting = FALSE;
2697 continue; /* With the next host or IP address */
2701 /* Second time round the loop: if the address is set but expired, and
2702 the message is newer than the last try, let it through. */
2706 if (host->address == NULL ||
2707 host->status != hstatus_unusable_expired ||
2708 host->last_try > received_time)
2711 debug_printf("trying expired host %s [%s]%s\n",
2712 host->name, host->address, pistring);
2713 host_is_expired = TRUE;
2716 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2717 it remains TRUE only if all hosts are expired and none are actually tried.
2722 /* If this host is listed as one to which access must be serialized,
2723 see if another Exim process has a connection to it, and if so, skip
2724 this host. If not, update the database to record our connection to it
2725 and remember this for later deletion. Do not do any of this if we are
2726 sending the message down a pre-existing connection. */
2729 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2730 host->address, NULL) == OK)
2732 serialize_key = string_sprintf("host-serialize-%s", host->name);
2733 if (!enq_start(serialize_key))
2736 debug_printf("skipping host %s because another Exim process "
2737 "is connected to it\n", host->name);
2744 /* OK, we have an IP address that is not waiting for its retry time to
2745 arrive (it might be expired) OR (second time round the loop) we have an
2746 expired host that hasn't been tried since the message arrived. Have a go
2747 at delivering the message to it. First prepare the addresses by flushing
2748 out the result of previous attempts, and finding the first address that
2749 is still to be delivered. */
2751 first_addr = prepare_addresses(addrlist, host);
2753 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2754 message_id, host->name, host->address, addrlist->address,
2755 (addrlist->next == NULL)? "" : ", ...");
2757 set_process_info("delivering %s to %s [%s] (%s%s)",
2758 message_id, host->name, host->address, addrlist->address,
2759 (addrlist->next == NULL)? "" : ", ...");
2761 /* This is not for real; don't do the delivery. If there are
2762 any remaining hosts, list them. */
2767 set_errno(addrlist, 0, NULL, OK, FALSE);
2768 for (addr = addrlist; addr != NULL; addr = addr->next)
2770 addr->host_used = host;
2771 addr->special_action = '*';
2772 addr->message = US"delivery bypassed by -N option";
2776 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2777 "*** host and remaining hosts:\n", tblock->name);
2778 for (host2 = host; host2 != NULL; host2 = host2->next)
2779 debug_printf(" %s [%s]\n", host2->name,
2780 (host2->address == NULL)? US"unset" : host2->address);
2785 /* This is for real. If the host is expired, we don't count it for
2786 hosts_max_retry. This ensures that all hosts must expire before an address
2787 is timed out, unless hosts_max_try_hardlimit (which protects against
2788 lunatic DNS configurations) is reached.
2790 If the host is not expired and we are about to hit the hosts_max_retry
2791 limit, check to see if there is a subsequent hosts with a different MX
2792 value. If so, make that the next host, and don't count this one. This is a
2793 heuristic to make sure that different MXs do get tried. With a normal kind
2794 of retry rule, they would get tried anyway when the earlier hosts were
2795 delayed, but if the domain has a "retry every time" type of rule - as is
2796 often used for the the very large ISPs, that won't happen. */
2800 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2804 debug_printf("hosts_max_try limit reached with this host\n");
2805 for (h = host; h != NULL; h = h->next)
2806 if (h->mx != host->mx) break;
2810 unexpired_hosts_tried--;
2811 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2812 "and will be tried\n");
2816 /* Attempt the delivery. */
2818 total_hosts_tried++;
2819 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2820 expanded_hosts != NULL, &message_defer, FALSE);
2823 OK => connection made, each address contains its result;
2824 message_defer is set for message-specific defers (when all
2825 recipients are marked defer)
2826 DEFER => there was a non-message-specific delivery problem;
2827 ERROR => there was a problem setting up the arguments for a filter,
2828 or there was a problem with expanding added headers
2831 /* If the result is not OK, there was a non-message-specific problem.
2832 If the result is DEFER, we need to write to the logs saying what happened
2833 for this particular host, except in the case of authentication and TLS
2834 failures, where the log has already been written. If all hosts defer a
2835 general message is written at the end. */
2837 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2838 first_addr->basic_errno != ERRNO_TLSFAILURE)
2839 write_logs(first_addr, host);
2841 /* If STARTTLS was accepted, but there was a failure in setting up the
2842 TLS session (usually a certificate screwup), and the host is not in
2843 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2844 TLS forcibly turned off. We have to start from scratch with a new SMTP
2845 connection. That's why the retry is done from here, not from within
2846 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2847 session, so the in-clear transmission after those errors, if permitted,
2848 happens inside smtp_deliver().] */
2851 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2852 ob->tls_tempfail_tryclear &&
2853 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2854 host->address, NULL) != OK)
2856 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2857 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2858 first_addr = prepare_addresses(addrlist, host);
2859 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2860 expanded_hosts != NULL, &message_defer, TRUE);
2861 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2862 write_logs(first_addr, host);
2867 /* Delivery attempt finished */
2869 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2872 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2873 message_id, host->name, host->address, addrlist->address,
2874 (addrlist->next == NULL)? "" : " (& others)", rs);
2876 /* Release serialization if set up */
2878 if (serialized) enq_end(serialize_key);
2880 /* If the result is DEFER, or if a host retry record is known to exist, we
2881 need to add an item to the retry chain for updating the retry database
2882 at the end of delivery. We only need to add the item to the top address,
2883 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2884 for any other delivery attempts using the same address. (It is copied into
2885 the unusable tree at the outer level, so even if different address blocks
2886 contain the same address, it still won't get tried again.) */
2888 if (rc == DEFER || retry_host_key != NULL)
2890 int delete_flag = (rc != DEFER)? rf_delete : 0;
2891 if (retry_host_key == NULL)
2893 retry_host_key = ob->retry_include_ip_address?
2894 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2895 string_sprintf("T:%S%s", host->name, pistring);
2898 /* If a delivery of another message over an existing SMTP connection
2899 yields DEFER, we do NOT set up retry data for the host. This covers the
2900 case when there are delays in routing the addresses in the second message
2901 that are so long that the server times out. This is alleviated by not
2902 routing addresses that previously had routing defers when handling an
2903 existing connection, but even so, this case may occur (e.g. if a
2904 previously happily routed address starts giving routing defers). If the
2905 host is genuinely down, another non-continued message delivery will
2906 notice it soon enough. */
2908 if (delete_flag != 0 || !continuing)
2909 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2911 /* We may have tried an expired host, if its retry time has come; ensure
2912 the status reflects the expiry for the benefit of any other addresses. */
2916 host->status = (host_is_expired)?
2917 hstatus_unusable_expired : hstatus_unusable;
2918 host->why = hwhy_deferred;
2922 /* If message_defer is set (host was OK, but every recipient got deferred
2923 because of some message-specific problem), or if that had happened
2924 previously so that a message retry key exists, add an appropriate item
2925 to the retry chain. Note that if there was a message defer but now there is
2926 a host defer, the message defer record gets deleted. That seems perfectly
2927 reasonable. Also, stop the message from being remembered as waiting
2928 for specific hosts. */
2930 if (message_defer || retry_message_key != NULL)
2932 int delete_flag = message_defer? 0 : rf_delete;
2933 if (retry_message_key == NULL)
2935 retry_message_key = ob->retry_include_ip_address?
2936 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2938 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2940 retry_add_item(addrlist, retry_message_key,
2941 rf_message | rf_host | delete_flag);
2942 update_waiting = FALSE;
2945 /* Any return other than DEFER (that is, OK or ERROR) means that the
2946 addresses have got their final statuses filled in for this host. In the OK
2947 case, see if any of them are deferred. */
2951 for (addr = addrlist; addr != NULL; addr = addr->next)
2953 if (addr->transport_return == DEFER)
2955 some_deferred = TRUE;
2961 /* If no addresses deferred or the result was ERROR, return. We do this for
2962 ERROR because a failing filter set-up or add_headers expansion is likely to
2963 fail for any host we try. */
2965 if (rc == ERROR || (rc == OK && !some_deferred))
2967 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2968 return TRUE; /* Each address has its status */
2971 /* If the result was DEFER or some individual addresses deferred, let
2972 the loop run to try other hosts with the deferred addresses, except for the
2973 case when we were trying to deliver down an existing channel and failed.
2974 Don't try any other hosts in this case. */
2976 if (continuing) break;
2978 /* If the whole delivery, or some individual addresses, were deferred and
2979 there are more hosts that could be tried, do not count this host towards
2980 the hosts_max_try limit if the age of the message is greater than the
2981 maximum retry time for this host. This means we may try try all hosts,
2982 ignoring the limit, when messages have been around for some time. This is
2983 important because if we don't try all hosts, the address will never time
2984 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2986 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2989 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2991 if (retry != NULL && retry->rules != NULL)
2993 retry_rule *last_rule;
2994 for (last_rule = retry->rules;
2995 last_rule->next != NULL;
2996 last_rule = last_rule->next);
2997 timedout = time(NULL) - received_time > last_rule->timeout;
2999 else timedout = TRUE; /* No rule => timed out */
3003 unexpired_hosts_tried--;
3004 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3005 "hosts_max_try (message older than host's retry time)\n");
3008 } /* End of loop for trying multiple hosts. */
3010 /* This is the end of the loop that repeats iff expired is TRUE and
3011 ob->delay_after_cutoff is FALSE. The second time round we will
3012 try those hosts that haven't been tried since the message arrived. */
3016 debug_printf("all IP addresses skipped or deferred at least one address\n");
3017 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3018 debug_printf("retrying IP addresses not tried since message arrived\n");
3023 /* Get here if all IP addresses are skipped or defer at least one address. In
3024 MUA wrapper mode, this will happen only for connection or other non-message-
3025 specific failures. Force the delivery status for all addresses to FAIL. */
3029 for (addr = addrlist; addr != NULL; addr = addr->next)
3030 addr->transport_return = FAIL;
3034 /* In the normal, non-wrapper case, add a standard message to each deferred
3035 address if there hasn't been an error, that is, if it hasn't actually been
3036 tried this time. The variable "expired" will be FALSE if any deliveries were
3037 actually tried, or if there was at least one host that was not expired. That
3038 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3039 a delivery has been tried, an error code will be set, and the failing of the
3040 message is handled by the retry code later.
3042 If queue_smtp is set, or this transport was called to send a subsequent message
3043 down an existing TCP/IP connection, and something caused the host not to be
3044 found, we end up here, but can detect these cases and handle them specially. */
3046 for (addr = addrlist; addr != NULL; addr = addr->next)
3048 /* If host is not NULL, it means that we stopped processing the host list
3049 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3050 means we need to behave as if some hosts were skipped because their retry
3051 time had not come. Specifically, this prevents the address from timing out.
3052 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3053 hosts were tried. */
3057 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3060 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3061 "hosts were tried\n");
3066 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3067 setflag(addr, af_retry_skipped);
3071 if (queue_smtp) /* no deliveries attempted */
3073 addr->transport_return = DEFER;
3074 addr->basic_errno = 0;
3075 addr->message = US"SMTP delivery explicitly queued";
3078 else if (addr->transport_return == DEFER &&
3079 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3080 addr->message == NULL)
3082 addr->basic_errno = ERRNO_HRETRY;
3083 if (continue_hostname != NULL)
3085 addr->message = US"no host found for existing SMTP connection";
3089 setflag(addr, af_pass_message); /* This is not a security risk */
3090 addr->message = (ob->delay_after_cutoff)?
3091 US"retry time not reached for any host after a long failure period" :
3092 US"all hosts have been failing for a long time and were last tried "
3093 "after this message arrived";
3095 /* If we are already using fallback hosts, or there are no fallback hosts
3096 defined, convert the result to FAIL to cause a bounce. */
3098 if (addr->host_list == addr->fallback_hosts ||
3099 addr->fallback_hosts == NULL)
3100 addr->transport_return = FAIL;
3104 if (hosts_retry == hosts_total)
3105 addr->message = US"retry time not reached for any host";
3106 else if (hosts_fail == hosts_total)
3107 addr->message = US"all host address lookups failed permanently";
3108 else if (hosts_defer == hosts_total)
3109 addr->message = US"all host address lookups failed temporarily";
3110 else if (hosts_serial == hosts_total)
3111 addr->message = US"connection limit reached for all hosts";
3112 else if (hosts_fail+hosts_defer == hosts_total)
3113 addr->message = US"all host address lookups failed";
3114 else addr->message = US"some host address lookups failed and retry time "
3115 "not reached for other hosts or connection limit reached";
3120 /* Update the database which keeps information about which messages are waiting
3121 for which hosts to become available. For some message-specific errors, the
3122 update_waiting flag is turned off because we don't want follow-on deliveries in
3123 those cases. If this transport instance is explicitly limited to one message
3124 per connection then follow-on deliveries are not possible and there's no need
3125 to create/update the per-transport wait-<transport_name> database. */
3127 if (update_waiting && tblock->connection_max_messages != 1)
3128 transport_update_waiting(hostlist, tblock->name);
3132 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3134 return TRUE; /* Each address has its status */
3137 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob