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)
924 /* If an authenticated_sender override has been specified for this transport
925 instance, expand it. If the expansion is forced to fail, and there was already
926 an authenticated_sender for this message, the original value will be used.
927 Other expansion failures are serious. An empty result is ignored, but there is
928 otherwise no check - this feature is expected to be used with LMTP and other
929 cases where non-standard addresses (e.g. without domains) might be required. */
931 if (ob->authenticated_sender != NULL)
933 uschar *new = expand_string(ob->authenticated_sender);
936 if (!expand_string_forcedfail)
938 uschar *message = string_sprintf("failed to expand "
939 "authenticated_sender: %s", expand_string_message);
940 set_errno(addrlist, 0, message, DEFER, FALSE);
944 else if (new[0] != 0) local_authenticated_sender = new;
950 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
955 /* Make a connection to the host if this isn't a continued delivery, and handle
956 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
957 specially so they can be identified for retries. */
959 if (continue_hostname == NULL)
961 inblock.sock = outblock.sock =
962 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
963 ob->keepalive, ob->dscp); /* This puts port into host->port */
965 if (inblock.sock < 0)
967 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
972 /* Expand the greeting message while waiting for the initial response. (Makes
973 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
974 delayed till here so that $sending_interface and $sending_port are set. */
976 helo_data = expand_string(ob->helo_data);
978 /* The first thing is to wait for an initial OK response. The dreaded "goto"
979 is nevertheless a reasonably clean way of programming this kind of logic,
980 where you want to escape on any error. */
984 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
985 ob->command_timeout)) goto RESPONSE_FAILED;
987 /* Now check if the helo_data expansion went well, and sign off cleanly if
990 if (helo_data == NULL)
992 uschar *message = string_sprintf("failed to expand helo_data: %s",
993 expand_string_message);
994 set_errno(addrlist, 0, message, DEFER, FALSE);
1000 /** Debugging without sending a message
1001 addrlist->transport_return = DEFER;
1005 /* Errors that occur after this point follow an SMTP command, which is
1006 left in big_buffer by smtp_write_command() for use in error messages. */
1008 smtp_command = big_buffer;
1010 /* Tell the remote who we are...
1012 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1013 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1014 greeting is of this form. The assumption was that the far end supports it
1015 properly... but experience shows that there are some that give 5xx responses,
1016 even though the banner includes "ESMTP" (there's a bloody-minded one that
1017 says "ESMTP not spoken here"). Cope with that case.
1019 September 2000: Time has passed, and it seems reasonable now to always send
1020 EHLO at the start. It is also convenient to make the change while installing
1023 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1024 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1025 would be no way to send out the mails, so there is now a host list
1026 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1027 PIPELINING problem as well. Maybe it can also be useful to cure other
1028 problems with broken servers.
1030 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1031 Then somebody tried it with a Microsoft mailer... It seems that all other
1032 mailers use upper case for some reason (the RFC is quite clear about case
1033 independence) so, for peace of mind, I gave in. */
1035 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1036 host->name, host->address, NULL) != OK;
1038 /* Alas; be careful, since this goto is not an error-out, so conceivably
1039 we might set data between here and the target which we assume to exist
1040 and be usable. I can see this coming back to bite us. */
1045 suppress_tls = FALSE;
1046 ob->tls_tempfail_tryclear = FALSE;
1047 smtp_command = US"SSL-on-connect";
1054 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1055 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1057 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1058 ob->command_timeout))
1060 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1067 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1072 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1074 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1075 ob->command_timeout)) goto RESPONSE_FAILED;
1078 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1079 lmtp_ignore_quota option was set. */
1081 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1082 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1083 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1085 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1088 tls_offered = esmtp &&
1089 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1090 PCRE_EOPT, NULL, 0) >= 0;
1094 /* For continuing deliveries down the same channel, the socket is the standard
1095 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1096 below). Set up the pointer to where subsequent commands will be left, for
1097 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1098 set from the command line if they were set in the process that passed the
1103 inblock.sock = outblock.sock = fileno(stdin);
1104 smtp_command = big_buffer;
1105 host->port = port; /* Record the port that was used */
1108 /* If TLS is available on this connection, whether continued or not, attempt to
1109 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1110 send another EHLO - the server may give a different answer in secure mode. We
1111 use a separate buffer for reading the response to STARTTLS so that if it is
1112 negative, the original EHLO data is available for subsequent analysis, should
1113 the client not be required to use TLS. If the response is bad, copy the buffer
1114 for error analysis. */
1117 if (tls_offered && !suppress_tls &&
1118 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1119 host->address, NULL) != OK)
1121 uschar buffer2[4096];
1122 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1125 /* If there is an I/O error, transmission of this message is deferred. If
1126 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1127 false, we also defer. However, if there is a temporary rejection of STARTTLS
1128 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1129 STARTTLS, we carry on. This means we will try to send the message in clear,
1130 unless the host is in hosts_require_tls (tested below). */
1132 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1133 ob->command_timeout))
1135 if (errno != 0 || buffer2[0] == 0 ||
1136 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1138 Ustrncpy(buffer, buffer2, sizeof(buffer));
1139 goto RESPONSE_FAILED;
1143 /* STARTTLS accepted: try to negotiate a TLS session. */
1148 int rc = tls_client_start(inblock.sock,
1151 NULL, /* No DH param */
1152 ob->tls_certificate,
1155 ob->tls_verify_certificates,
1157 ob->tls_require_ciphers,
1158 ob->tls_dh_min_bits,
1159 ob->command_timeout);
1161 /* TLS negotiation failed; give an error. From outside, this function may
1162 be called again to try in clear on a new connection, if the options permit
1163 it for this host. */
1167 save_errno = ERRNO_TLSFAILURE;
1168 message = US"failure while setting up TLS session";
1173 /* TLS session is set up */
1175 for (addr = addrlist; addr != NULL; addr = addr->next)
1177 if (addr->transport_return == PENDING_DEFER)
1179 addr->cipher = tls_out.cipher;
1180 addr->peerdn = tls_out.peerdn;
1186 /* if smtps, we'll have smtp_command set to something else; always safe to
1188 smtp_command = big_buffer;
1190 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1191 helo_data is null, we are dealing with a connection that was passed from
1192 another process, and so we won't have expanded helo_data above. We have to
1193 expand it here. $sending_ip_address and $sending_port are set up right at the
1194 start of the Exim process (in exim.c). */
1196 if (tls_out.active >= 0)
1199 if (helo_data == NULL)
1201 helo_data = expand_string(ob->helo_data);
1202 if (helo_data == NULL)
1204 uschar *message = string_sprintf("failed to expand helo_data: %s",
1205 expand_string_message);
1206 set_errno(addrlist, 0, message, DEFER, FALSE);
1212 /* For SMTPS we need to wait for the initial OK response. */
1215 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1216 ob->command_timeout)) goto RESPONSE_FAILED;
1220 greeting_cmd = "EHLO";
1223 greeting_cmd = "HELO";
1225 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1228 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1229 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1231 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1232 ob->command_timeout))
1233 goto RESPONSE_FAILED;
1236 /* If the host is required to use a secure channel, ensure that we
1239 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1240 host->address, NULL) == OK)
1242 save_errno = ERRNO_TLSREQUIRED;
1243 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1244 host->name, host->address,
1245 tls_offered? "an attempt to start TLS failed" :
1246 "the server did not offer TLS support");
1251 /* If TLS is active, we have just started it up and re-done the EHLO command,
1252 so its response needs to be analyzed. If TLS is not active and this is a
1253 continued session down a previously-used socket, we haven't just done EHLO, so
1256 if (continue_hostname == NULL
1258 || tls_out.active >= 0
1263 uschar *fail_reason = US"server did not advertise AUTH support";
1265 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1266 lmtp_ignore_quota option was set. */
1268 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1269 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1270 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1272 /* If the response to EHLO specified support for the SIZE parameter, note
1273 this, provided size_addition is non-negative. */
1275 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1276 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1277 PCRE_EOPT, NULL, 0) >= 0;
1279 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1280 the current host, esmtp will be false, so PIPELINING can never be used. If
1281 the current host matches hosts_avoid_pipelining, don't do it. */
1283 smtp_use_pipelining = esmtp &&
1284 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1285 host->address, NULL) != OK &&
1286 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1287 PCRE_EOPT, NULL, 0) >= 0;
1289 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1290 smtp_use_pipelining? "" : "not ");
1292 /* Note if the response to EHLO specifies support for the AUTH extension.
1293 If it has, check that this host is one we want to authenticate to, and do
1294 the business. The host name and address must be available when the
1295 authenticator's client driver is running. */
1297 smtp_authenticated = FALSE;
1298 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1299 host->name, host->address, NULL);
1301 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1303 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1304 expand_nmax = -1; /* reset */
1306 /* Must not do this check until after we have saved the result of the
1307 regex match above. */
1309 if (require_auth == OK ||
1310 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1311 host->address, NULL) == OK)
1314 fail_reason = US"no common mechanisms were found";
1316 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1318 /* Scan the configured authenticators looking for one which is configured
1319 for use as a client, which is not suppressed by client_condition, and
1320 whose name matches an authentication mechanism supported by the server.
1321 If one is found, attempt to authenticate by calling its client function.
1324 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1328 (au->client_condition != NULL &&
1329 !expand_check_condition(au->client_condition, au->name,
1330 US"client authenticator")))
1332 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1334 (au->client)? "client_condition is false" :
1335 "not configured as a client");
1339 /* Loop to scan supported server mechanisms */
1344 int len = Ustrlen(au->public_name);
1345 while (isspace(*p)) p++;
1347 if (strncmpic(au->public_name, p, len) != 0 ||
1348 (p[len] != 0 && !isspace(p[len])))
1350 while (*p != 0 && !isspace(*p)) p++;
1354 /* Found data for a listed mechanism. Call its client entry. Set
1355 a flag in the outblock so that data is overwritten after sending so
1356 that reflections don't show it. */
1358 fail_reason = US"authentication attempt(s) failed";
1359 outblock.authenticating = TRUE;
1360 rc = (au->info->clientcode)(au, &inblock, &outblock,
1361 ob->command_timeout, buffer, sizeof(buffer));
1362 outblock.authenticating = FALSE;
1363 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1366 /* A temporary authentication failure must hold up delivery to
1367 this host. After a permanent authentication failure, we carry on
1368 to try other authentication methods. If all fail hard, try to
1369 deliver the message unauthenticated unless require_auth was set. */
1374 smtp_authenticated = TRUE; /* stops the outer loop */
1377 /* Failure after writing a command */
1382 /* Failure after reading a response */
1385 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1386 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1387 au->name, host->name, host->address, buffer);
1390 /* Failure by some other means. In effect, the authenticator
1391 decided it wasn't prepared to handle this case. Typically this
1392 is the result of "fail" in an expansion string. Do we need to
1393 log anything here? Feb 2006: a message is now put in the buffer
1394 if logging is required. */
1398 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1399 "authentication H=%s [%s] %s", au->name, host->name,
1400 host->address, buffer);
1403 /* Internal problem, message in buffer. */
1407 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1411 break; /* If not authenticated, try next authenticator */
1412 } /* Loop for scanning supported server mechanisms */
1413 } /* Loop for further authenticators */
1417 /* If we haven't authenticated, but are required to, give up. */
1419 if (require_auth == OK && !smtp_authenticated)
1422 set_errno(addrlist, ERRNO_AUTHFAIL,
1423 string_sprintf("authentication required but %s", fail_reason), DEFER,
1429 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1430 message-specific. */
1434 /* If there is a filter command specified for this transport, we can now
1435 set it up. This cannot be done until the identify of the host is known. */
1437 if (tblock->filter_command != NULL)
1441 sprintf(CS buffer, "%.50s transport", tblock->name);
1442 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1443 TRUE, DEFER, addrlist, buffer, NULL);
1444 transport_filter_timeout = tblock->filter_timeout;
1446 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1451 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1459 /* For messages that have more than the maximum number of envelope recipients,
1460 we want to send several transactions down the same SMTP connection. (See
1461 comments in deliver.c as to how this reconciles, heuristically, with
1462 remote_max_parallel.) This optimization was added to Exim after the following
1463 code was already working. The simplest way to put it in without disturbing the
1464 code was to use a goto to jump back to this point when there is another
1465 transaction to handle. */
1468 sync_addr = first_addr;
1472 completed_address = FALSE;
1475 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1476 qualification, send it, adding something to the message size to allow for
1477 imprecision and things that get added en route. Exim keeps the number of lines
1478 in a message, so we can give an accurate value for the original message, but we
1479 need some additional to handle added headers. (Double "." characters don't get
1480 included in the count.) */
1487 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1491 /* Add the authenticated sender address if present */
1493 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1494 local_authenticated_sender != NULL)
1496 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1497 auth_xtextencode(local_authenticated_sender,
1498 Ustrlen(local_authenticated_sender)));
1501 /* From here until we send the DATA command, we can make use of PIPELINING
1502 if the server host supports it. The code has to be able to check the responses
1503 at any point, for when the buffer fills up, so we write it totally generally.
1504 When PIPELINING is off, each command written reports that it has flushed the
1507 pending_MAIL = TRUE; /* The block starts with MAIL */
1509 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1510 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1511 mail_command = string_copy(big_buffer); /* Save for later error message */
1515 case -1: /* Transmission error */
1518 case +1: /* Block was sent */
1519 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1520 ob->command_timeout))
1522 if (errno == 0 && buffer[0] == '4')
1524 errno = ERRNO_MAIL4XX;
1525 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1527 goto RESPONSE_FAILED;
1529 pending_MAIL = FALSE;
1533 /* Pass over all the relevant recipient addresses for this host, which are the
1534 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1535 several before we have to read the responses for those seen so far. This
1536 checking is done by a subroutine because it also needs to be done at the end.
1537 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1538 the next one if not all are sent.
1540 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1541 last address because we want to abort if any recipients have any kind of
1542 problem, temporary or permanent. We know that all recipient addresses will have
1543 the PENDING_DEFER status, because only one attempt is ever made, and we know
1544 that max_rcpt will be large, so all addresses will be done at once. */
1546 for (addr = first_addr;
1547 address_count < max_rcpt && addr != NULL;
1553 if (addr->transport_return != PENDING_DEFER) continue;
1556 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1558 /* Now send the RCPT command, and process outstanding responses when
1559 necessary. After a timeout on RCPT, we just end the function, leaving the
1560 yield as OK, because this error can often mean that there is a problem with
1561 just one address, so we don't want to delay the host. */
1563 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1564 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1565 if (count < 0) goto SEND_FAILED;
1568 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1569 &sync_addr, host, count, ob->address_retry_include_sender,
1570 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1573 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1574 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1577 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1578 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1579 case 0: /* No 2xx or 5xx, but no probs */
1582 case -1: goto END_OFF; /* Timeout on RCPT */
1583 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1585 pending_MAIL = FALSE; /* Dealt with MAIL */
1587 } /* Loop for next address */
1589 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1590 permanently or temporarily. We should have flushed and synced after the last
1595 address_item *badaddr;
1596 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1598 if (badaddr->transport_return != PENDING_OK) break;
1600 if (badaddr != NULL)
1602 set_errno(addrlist, 0, badaddr->message, FAIL,
1603 testflag(badaddr, af_pass_message));
1608 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1609 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1610 have a good recipient buffered up if we are pipelining. We don't want to waste
1611 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1612 are pipelining. The responses are all handled by sync_responses(). */
1614 if (ok || (smtp_use_pipelining && !mua_wrapper))
1616 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1617 if (count < 0) goto SEND_FAILED;
1618 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1619 host, count, ob->address_retry_include_sender, pending_MAIL,
1620 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1622 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1623 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1626 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1627 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1628 case 0: break; /* No 2xx or 5xx, but no probs */
1630 case -1: goto END_OFF; /* Timeout on RCPT */
1631 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1635 /* Save the first address of the next batch. */
1639 /* If there were no good recipients (but otherwise there have been no
1640 problems), just set ok TRUE, since we have handled address-specific errors
1641 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1642 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1643 well as body. Set the appropriate timeout value to be used for each chunk.
1644 (Haven't been able to make it work using select() for writing yet.) */
1646 if (!ok) ok = TRUE; else
1648 sigalrm_seen = FALSE;
1649 transport_write_timeout = ob->data_timeout;
1650 smtp_command = US"sending data block"; /* For error messages */
1651 DEBUG(D_transport|D_v)
1652 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1653 transport_count = 0;
1654 #ifndef DISABLE_DKIM
1655 ok = dkim_transport_write_message(addrlist, inblock.sock,
1656 topt_use_crlf | topt_end_dot | topt_escape_headers |
1657 (tblock->body_only? topt_no_headers : 0) |
1658 (tblock->headers_only? topt_no_body : 0) |
1659 (tblock->return_path_add? topt_add_return_path : 0) |
1660 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1661 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1662 0, /* No size limit */
1663 tblock->add_headers, tblock->remove_headers,
1664 US".", US"..", /* Escaping strings */
1665 tblock->rewrite_rules, tblock->rewrite_existflags,
1666 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1667 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1670 ok = transport_write_message(addrlist, inblock.sock,
1671 topt_use_crlf | topt_end_dot | topt_escape_headers |
1672 (tblock->body_only? topt_no_headers : 0) |
1673 (tblock->headers_only? topt_no_body : 0) |
1674 (tblock->return_path_add? topt_add_return_path : 0) |
1675 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1676 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1677 0, /* No size limit */
1678 tblock->add_headers, tblock->remove_headers,
1679 US".", US"..", /* Escaping strings */
1680 tblock->rewrite_rules, tblock->rewrite_existflags);
1683 /* transport_write_message() uses write() because it is called from other
1684 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1685 it can exit with "Broken pipe" as its error. This really means that the
1686 socket got closed at the far end. */
1688 transport_write_timeout = 0; /* for subsequent transports */
1690 /* Failure can either be some kind of I/O disaster (including timeout),
1691 or the failure of a transport filter or the expansion of added headers. */
1695 buffer[0] = 0; /* There hasn't been a response */
1696 goto RESPONSE_FAILED;
1699 /* We used to send the terminating "." explicitly here, but because of
1700 buffering effects at both ends of TCP/IP connections, you don't gain
1701 anything by keeping it separate, so it might as well go in the final
1702 data buffer for efficiency. This is now done by setting the topt_end_dot
1705 smtp_command = US"end of data";
1707 /* For SMTP, we now read a single response that applies to the whole message.
1708 If it is OK, then all the addresses have been delivered. */
1712 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1714 if (!ok && errno == 0 && buffer[0] == '4')
1716 errno = ERRNO_DATA4XX;
1717 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1721 /* For LMTP, we get back a response for every RCPT command that we sent;
1722 some may be accepted and some rejected. For those that get a response, their
1723 status is fixed; any that are accepted have been handed over, even if later
1724 responses crash - at least, that's how I read RFC 2033.
1726 If all went well, mark the recipient addresses as completed, record which
1727 host/IPaddress they were delivered to, and cut out RSET when sending another
1728 message down the same channel. Write the completed addresses to the journal
1729 now so that they are recorded in case there is a crash of hardware or
1730 software before the spool gets updated. Also record the final SMTP
1731 confirmation if needed (for SMTP only). */
1736 int delivery_time = (int)(time(NULL) - start_delivery_time);
1739 uschar *conf = NULL;
1742 /* Make a copy of the host if it is local to this invocation
1743 of the transport. */
1747 thost = store_get(sizeof(host_item));
1749 thost->name = string_copy(host->name);
1750 thost->address = string_copy(host->address);
1754 /* Set up confirmation if needed - applies only to SMTP */
1756 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1758 uschar *s = string_printing(buffer);
1759 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1762 /* Process all transported addresses - for LMTP, read a status for
1765 for (addr = addrlist; addr != first_addr; addr = addr->next)
1767 if (addr->transport_return != PENDING_OK) continue;
1769 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1770 remaining addresses. Otherwise, it's a return code for just the one
1771 address. For temporary errors, add a retry item for the address so that
1772 it doesn't get tried again too soon. */
1776 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1779 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1780 addr->message = string_sprintf("LMTP error after %s: %s",
1781 big_buffer, string_printing(buffer));
1782 setflag(addr, af_pass_message); /* Allow message to go to user */
1783 if (buffer[0] == '5')
1784 addr->transport_return = FAIL;
1787 errno = ERRNO_DATA4XX;
1788 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1789 addr->transport_return = DEFER;
1790 retry_add_item(addr, addr->address_retry_key, 0);
1794 completed_address = TRUE; /* NOW we can set this flag */
1795 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1797 uschar *s = string_printing(buffer);
1798 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1802 /* SMTP, or success return from LMTP for this address. Pass back the
1803 actual host that was used. */
1805 addr->transport_return = OK;
1806 addr->more_errno = delivery_time;
1807 addr->host_used = thost;
1808 addr->special_action = flag;
1809 addr->message = conf;
1812 /* Update the journal. For homonymic addresses, use the base address plus
1813 the transport name. See lots of comments in deliver.c about the reasons
1814 for the complications when homonyms are involved. Just carry on after
1815 write error, as it may prove possible to update the spool file later. */
1817 if (testflag(addr, af_homonym))
1818 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1820 sprintf(CS buffer, "%.500s\n", addr->unique);
1822 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1823 len = Ustrlen(CS buffer);
1824 if (write(journal_fd, buffer, len) != len)
1825 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1826 "%s: %s", buffer, strerror(errno));
1829 /* Ensure the journal file is pushed out to disk. */
1831 if (EXIMfsync(journal_fd) < 0)
1832 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1838 /* Handle general (not specific to one address) failures here. The value of ok
1839 is used to skip over this code on the falling through case. A timeout causes a
1840 deferral. Other errors may defer or fail according to the response code, and
1841 may set up a special errno value, e.g. after connection chopped, which is
1842 assumed if errno == 0 and there is no text in the buffer. If control reaches
1843 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1844 the problem is not related to this specific message. */
1853 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1854 buffer, &code, &message, &pass_message);
1860 message = US string_sprintf("send() to %s [%s] failed: %s",
1861 host->name, host->address, strerror(save_errno));
1865 /* This label is jumped to directly when a TLS negotiation has failed,
1866 or was not done for a host for which it is required. Values will be set
1867 in message and save_errno, and setting_up will always be true. Treat as
1868 a temporary error. */
1875 /* If the failure happened while setting up the call, see if the failure was
1876 a 5xx response (this will either be on connection, or following HELO - a 5xx
1877 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1878 never going to accept them. For other errors during setting up (timeouts or
1879 whatever), defer all addresses, and yield DEFER, so that the host is not
1880 tried again for a while. */
1883 ok = FALSE; /* For when reached by GOTO */
1889 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1893 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1898 /* We want to handle timeouts after MAIL or "." and loss of connection after
1899 "." specially. They can indicate a problem with the sender address or with
1900 the contents of the message rather than a real error on the connection. These
1901 cases are treated in the same way as a 4xx response. This next bit of code
1902 does the classification. */
1913 message_error = TRUE;
1917 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1918 Ustrncmp(smtp_command,"end ",4) == 0;
1921 case ERRNO_SMTPCLOSED:
1922 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1926 message_error = FALSE;
1930 /* Handle the cases that are treated as message errors. These are:
1932 (a) negative response or timeout after MAIL
1933 (b) negative response after DATA
1934 (c) negative response or timeout or dropped connection after "."
1936 It won't be a negative response or timeout after RCPT, as that is dealt
1937 with separately above. The action in all cases is to set an appropriate
1938 error code for all the addresses, but to leave yield set to OK because the
1939 host itself has not failed. Of course, it might in practice have failed
1940 when we've had a timeout, but if so, we'll discover that at the next
1941 delivery attempt. For a temporary error, set the message_defer flag, and
1942 write to the logs for information if this is not the last host. The error
1943 for the last host will be logged as part of the address's log line. */
1947 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1948 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1951 /* If there's an errno, the message contains just the identity of
1954 if (code != '5') /* Anything other than 5 is treated as temporary */
1957 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1958 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1959 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1960 *message_defer = TRUE;
1964 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1965 ".", or some other transportation error. We defer all addresses and yield
1966 DEFER, except for the case of failed add_headers expansion, or a transport
1967 filter failure, when the yield should be ERROR, to stop it trying other
1972 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1973 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1974 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1980 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1981 SMTP session tidily. However, if there were too many addresses to send in one
1982 message (indicated by first_addr being non-NULL) we want to carry on with the
1983 rest of them. Also, it is desirable to send more than one message down the SMTP
1984 connection if there are several waiting, provided we haven't already sent so
1985 many as to hit the configured limit. The function transport_check_waiting looks
1986 for a waiting message and returns its id. Then transport_pass_socket tries to
1987 set up a continued delivery by passing the socket on to another process. The
1988 variable send_rset is FALSE if a message has just been successfully transfered.
1990 If we are already sending down a continued channel, there may be further
1991 addresses not yet delivered that are aimed at the same host, but which have not
1992 been passed in this run of the transport. In this case, continue_more will be
1993 true, and all we should do is send RSET if necessary, and return, leaving the
1996 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1997 do not want to continue with other messages down the same channel, because that
1998 can lead to looping between two or more messages, all with the same,
1999 temporarily failing address(es). [The retry information isn't updated yet, so
2000 new processes keep on trying.] We probably also don't want to try more of this
2001 message's addresses either.
2003 If we have started a TLS session, we have to end it before passing the
2004 connection to a new process. However, not all servers can handle this (Exim
2005 can), so we do not pass such a connection on if the host matches
2006 hosts_nopass_tls. */
2009 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2010 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2011 continue_more, yield, (first_addr == NULL)? "":"not ");
2013 if (completed_address && ok && send_quit)
2016 if (first_addr != NULL || continue_more ||
2018 (tls_out.active < 0 ||
2019 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2020 host->address, NULL) != OK)
2022 transport_check_waiting(tblock->name, host->name,
2023 tblock->connection_max_messages, new_message_id, &more)
2031 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2033 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2034 host->address, strerror(save_errno));
2037 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2038 ob->command_timeout)))
2041 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2045 DEBUG(D_transport) debug_printf("%s\n", msg);
2050 /* Either RSET was not needed, or it succeeded */
2054 if (first_addr != NULL) /* More addresses still to be sent */
2055 { /* in this run of the transport */
2056 continue_sequence++; /* Causes * in logging */
2059 if (continue_more) return yield; /* More addresses for another run */
2061 /* Pass the socket to a new Exim process. Before doing so, we must shut
2062 down TLS. Not all MTAs allow for the continuation of the SMTP session
2063 when TLS is shut down. We test for this by sending a new EHLO. If we
2064 don't get a good response, we don't attempt to pass the socket on. */
2067 if (tls_out.active >= 0)
2069 tls_close(FALSE, TRUE);
2073 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2074 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2075 ob->command_timeout);
2079 /* If the socket is successfully passed, we musn't send QUIT (or
2080 indeed anything!) from here. */
2082 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2083 new_message_id, inblock.sock))
2089 /* If RSET failed and there are addresses left, they get deferred. */
2091 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2095 /* End off tidily with QUIT unless the connection has died or the socket has
2096 been passed to another process. There has been discussion on the net about what
2097 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2098 to wait for a response, but on the other hand, there isn't anything one can do
2099 with an error response, other than log it. Exim used to do that. However,
2100 further discussion suggested that it is positively advantageous not to wait for
2101 the response, but to close the session immediately. This is supposed to move
2102 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2103 load from the server. (Hosts that are both servers and clients may not see much
2104 difference, of course.) Further discussion indicated that this was safe to do
2105 on Unix systems which have decent implementations of TCP/IP that leave the
2106 connection around for a while (TIME_WAIT) after the application has gone away.
2107 This enables the response sent by the server to be properly ACKed rather than
2108 timed out, as can happen on broken TCP/IP implementations on other OS.
2110 This change is being made on 31-Jul-98. After over a year of trouble-free
2111 operation, the old commented-out code was removed on 17-Sep-99. */
2114 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2119 tls_close(FALSE, TRUE);
2122 /* Close the socket, and return the appropriate value, first setting
2123 continue_transport and continue_hostname NULL to prevent any other addresses
2124 that may include the host from trying to re-use a continuation socket. This
2125 works because the NULL setting is passed back to the calling process, and
2126 remote_max_parallel is forced to 1 when delivering over an existing connection,
2128 If all went well and continue_more is set, we shouldn't actually get here if
2129 there are further addresses, as the return above will be taken. However,
2130 writing RSET might have failed, or there may be other addresses whose hosts are
2131 specified in the transports, and therefore not visible at top level, in which
2132 case continue_more won't get set. */
2134 (void)close(inblock.sock);
2135 continue_transport = NULL;
2136 continue_hostname = NULL;
2143 /*************************************************
2144 * Closedown entry point *
2145 *************************************************/
2147 /* This function is called when exim is passed an open smtp channel
2148 from another incarnation, but the message which it has been asked
2149 to deliver no longer exists. The channel is on stdin.
2151 We might do fancy things like looking for another message to send down
2152 the channel, but if the one we sought has gone, it has probably been
2153 delivered by some other process that itself will seek further messages,
2154 so just close down our connection.
2156 Argument: pointer to the transport instance block
2161 smtp_transport_closedown(transport_instance *tblock)
2163 smtp_transport_options_block *ob =
2164 (smtp_transport_options_block *)(tblock->options_block);
2165 smtp_inblock inblock;
2166 smtp_outblock outblock;
2168 uschar inbuffer[4096];
2169 uschar outbuffer[16];
2171 inblock.sock = fileno(stdin);
2172 inblock.buffer = inbuffer;
2173 inblock.buffersize = sizeof(inbuffer);
2174 inblock.ptr = inbuffer;
2175 inblock.ptrend = inbuffer;
2177 outblock.sock = inblock.sock;
2178 outblock.buffersize = sizeof(outbuffer);
2179 outblock.buffer = outbuffer;
2180 outblock.ptr = outbuffer;
2181 outblock.cmd_count = 0;
2182 outblock.authenticating = FALSE;
2184 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2185 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2186 ob->command_timeout);
2187 (void)close(inblock.sock);
2192 /*************************************************
2193 * Prepare addresses for delivery *
2194 *************************************************/
2196 /* This function is called to flush out error settings from previous delivery
2197 attempts to other hosts. It also records whether we got here via an MX record
2198 or not in the more_errno field of the address. We are interested only in
2199 addresses that are still marked DEFER - others may have got delivered to a
2200 previously considered IP address. Set their status to PENDING_DEFER to indicate
2201 which ones are relevant this time.
2204 addrlist the list of addresses
2205 host the host we are delivering to
2207 Returns: the first address for this delivery
2210 static address_item *
2211 prepare_addresses(address_item *addrlist, host_item *host)
2213 address_item *first_addr = NULL;
2215 for (addr = addrlist; addr != NULL; addr = addr->next)
2217 if (addr->transport_return != DEFER) continue;
2218 if (first_addr == NULL) first_addr = addr;
2219 addr->transport_return = PENDING_DEFER;
2220 addr->basic_errno = 0;
2221 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2222 addr->message = NULL;
2224 addr->cipher = NULL;
2225 addr->peerdn = NULL;
2233 /*************************************************
2234 * Main entry point *
2235 *************************************************/
2237 /* See local README for interface details. As this is a remote transport, it is
2238 given a chain of addresses to be delivered in one connection, if possible. It
2239 always returns TRUE, indicating that each address has its own independent
2240 status set, except if there is a setting up problem, in which case it returns
2244 smtp_transport_entry(
2245 transport_instance *tblock, /* data for this instantiation */
2246 address_item *addrlist) /* addresses we are working on */
2250 int hosts_defer = 0;
2252 int hosts_looked_up = 0;
2253 int hosts_retry = 0;
2254 int hosts_serial = 0;
2255 int hosts_total = 0;
2256 int total_hosts_tried = 0;
2258 BOOL expired = TRUE;
2259 BOOL continuing = continue_hostname != NULL;
2260 uschar *expanded_hosts = NULL;
2262 uschar *tid = string_sprintf("%s transport", tblock->name);
2263 smtp_transport_options_block *ob =
2264 (smtp_transport_options_block *)(tblock->options_block);
2265 host_item *hostlist = addrlist->host_list;
2266 host_item *host = NULL;
2270 debug_printf("%s transport entered\n", tblock->name);
2271 for (addr = addrlist; addr != NULL; addr = addr->next)
2272 debug_printf(" %s\n", addr->address);
2273 if (continuing) debug_printf("already connected to %s [%s]\n",
2274 continue_hostname, continue_host_address);
2277 /* Set the flag requesting that these hosts be added to the waiting
2278 database if the delivery fails temporarily or if we are running with
2279 queue_smtp or a 2-stage queue run. This gets unset for certain
2280 kinds of error, typically those that are specific to the message. */
2282 update_waiting = TRUE;
2284 /* If a host list is not defined for the addresses - they must all have the
2285 same one in order to be passed to a single transport - or if the transport has
2286 a host list with hosts_override set, use the host list supplied with the
2287 transport. It is an error for this not to exist. */
2289 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2291 if (ob->hosts == NULL)
2293 addrlist->message = string_sprintf("%s transport called with no hosts set",
2295 addrlist->transport_return = PANIC;
2296 return FALSE; /* Only top address has status */
2299 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2302 /* If the transport's host list contains no '$' characters, and we are not
2303 randomizing, it is fixed and therefore a chain of hosts can be built once
2304 and for all, and remembered for subsequent use by other calls to this
2305 transport. If, on the other hand, the host list does contain '$', or we are
2306 randomizing its order, we have to rebuild it each time. In the fixed case,
2307 as the hosts string will never be used again, it doesn't matter that we
2308 replace all the : characters with zeros. */
2310 if (ob->hostlist == NULL)
2312 uschar *s = ob->hosts;
2314 if (Ustrchr(s, '$') != NULL)
2316 expanded_hosts = expand_string(s);
2317 if (expanded_hosts == NULL)
2319 addrlist->message = string_sprintf("failed to expand list of hosts "
2320 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2321 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2322 return FALSE; /* Only top address has status */
2324 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2325 "\"%s\"\n", s, expanded_hosts);
2329 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2331 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2333 /* Check that the expansion yielded something useful. */
2334 if (hostlist == NULL)
2337 string_sprintf("%s transport has empty hosts setting", tblock->name);
2338 addrlist->transport_return = PANIC;
2339 return FALSE; /* Only top address has status */
2342 /* If there was no expansion of hosts, save the host list for
2345 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2348 /* This is not the first time this transport has been run in this delivery;
2349 the host list was built previously. */
2351 else hostlist = ob->hostlist;
2354 /* The host list was supplied with the address. If hosts_randomize is set, we
2355 must sort it into a random order if it did not come from MX records and has not
2356 already been randomized (but don't bother if continuing down an existing
2359 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2361 host_item *newlist = NULL;
2362 while (hostlist != NULL)
2364 host_item *h = hostlist;
2365 hostlist = hostlist->next;
2367 h->sort_key = random_number(100);
2369 if (newlist == NULL)
2374 else if (h->sort_key < newlist->sort_key)
2381 host_item *hh = newlist;
2382 while (hh->next != NULL)
2384 if (h->sort_key < hh->next->sort_key) break;
2392 hostlist = addrlist->host_list = newlist;
2396 /* Sort out the default port. */
2398 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2401 /* For each host-plus-IP-address on the list:
2403 . If this is a continued delivery and the host isn't the one with the
2404 current connection, skip.
2406 . If the status is unusable (i.e. previously failed or retry checked), skip.
2408 . If no IP address set, get the address, either by turning the name into
2409 an address, calling gethostbyname if gethostbyname is on, or by calling
2410 the DNS. The DNS may yield multiple addresses, in which case insert the
2411 extra ones into the list.
2413 . Get the retry data if not previously obtained for this address and set the
2414 field which remembers the state of this address. Skip if the retry time is
2415 not reached. If not, remember whether retry data was found. The retry string
2416 contains both the name and the IP address.
2418 . Scan the list of addresses and mark those whose status is DEFER as
2419 PENDING_DEFER. These are the only ones that will be processed in this cycle
2422 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2423 Some addresses may be successfully delivered, others may fail, and yet
2424 others may get temporary errors and so get marked DEFER.
2426 . The return from the delivery attempt is OK if a connection was made and a
2427 valid SMTP dialogue was completed. Otherwise it is DEFER.
2429 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2431 . If fail to connect, or other defer state, add a retry item.
2433 . If there are any addresses whose status is still DEFER, carry on to the
2434 next host/IPaddress, unless we have tried the number of hosts given
2435 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2436 there is some fancy logic for hosts_max_try that means its limit can be
2437 overstepped in some circumstances.
2439 If we get to the end of the list, all hosts have deferred at least one address,
2440 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2441 delivery attempt to those hosts whose last try was before the arrival time of
2442 the current message. To cope with this, we have to go round the loop a second
2443 time. After that, set the status and error data for any addresses that haven't
2444 had it set already. */
2446 for (cutoff_retry = 0; expired &&
2447 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2450 host_item *nexthost = NULL;
2451 int unexpired_hosts_tried = 0;
2453 for (host = hostlist;
2455 unexpired_hosts_tried < ob->hosts_max_try &&
2456 total_hosts_tried < ob->hosts_max_try_hardlimit;
2462 BOOL serialized = FALSE;
2463 BOOL host_is_expired = FALSE;
2464 BOOL message_defer = FALSE;
2465 BOOL ifchanges = FALSE;
2466 BOOL some_deferred = FALSE;
2467 address_item *first_addr = NULL;
2468 uschar *interface = NULL;
2469 uschar *retry_host_key = NULL;
2470 uschar *retry_message_key = NULL;
2471 uschar *serialize_key = NULL;
2473 /* Default next host is next host. :-) But this can vary if the
2474 hosts_max_try limit is hit (see below). It may also be reset if a host
2475 address is looked up here (in case the host was multihomed). */
2477 nexthost = host->next;
2479 /* If the address hasn't yet been obtained from the host name, look it up
2480 now, unless the host is already marked as unusable. If it is marked as
2481 unusable, it means that the router was unable to find its IP address (in
2482 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2483 the lookup failed last time. We don't get this far if *all* MX records
2484 point to non-existent hosts; that is treated as a hard error.
2486 We can just skip this host entirely. When the hosts came from the router,
2487 the address will timeout based on the other host(s); when the address is
2488 looked up below, there is an explicit retry record added.
2490 Note that we mustn't skip unusable hosts if the address is not unset; they
2491 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2493 if (host->address == NULL)
2495 int new_port, flags;
2497 uschar *canonical_name;
2499 if (host->status >= hstatus_unusable)
2501 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2506 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2508 /* The host name is permitted to have an attached port. Find it, and
2509 strip it from the name. Just remember it for now. */
2511 new_port = host_item_get_port(host);
2513 /* Count hosts looked up */
2517 /* Find by name if so configured, or if it's an IP address. We don't
2518 just copy the IP address, because we need the test-for-local to happen. */
2520 flags = HOST_FIND_BY_A;
2521 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2522 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2524 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2525 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2527 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2528 &canonical_name, NULL);
2530 /* Update the host (and any additional blocks, resulting from
2531 multihoming) with a host-specific port, if any. */
2533 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2535 /* Failure to find the host at this time (usually DNS temporary failure)
2536 is really a kind of routing failure rather than a transport failure.
2537 Therefore we add a retry item of the routing kind, not to stop us trying
2538 to look this name up here again, but to ensure the address gets timed
2539 out if the failures go on long enough. A complete failure at this point
2540 commonly points to a configuration error, but the best action is still
2541 to carry on for the next host. */
2543 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2545 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2547 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2548 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2549 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2550 host->status = hstatus_unusable;
2552 for (addr = addrlist; addr != NULL; addr = addr->next)
2554 if (addr->transport_return != DEFER) continue;
2555 addr->basic_errno = ERRNO_UNKNOWNHOST;
2557 string_sprintf("failed to lookup IP address for %s", host->name);
2562 /* If the host is actually the local host, we may have a problem, or
2563 there may be some cunning configuration going on. In the problem case,
2564 log things and give up. The default transport status is already DEFER. */
2566 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2568 for (addr = addrlist; addr != NULL; addr = addr->next)
2570 addr->basic_errno = 0;
2571 addr->message = string_sprintf("%s transport found host %s to be "
2572 "local", tblock->name, host->name);
2576 } /* End of block for IP address lookup */
2578 /* If this is a continued delivery, we are interested only in the host
2579 which matches the name of the existing open channel. The check is put
2580 here after the local host lookup, in case the name gets expanded as a
2581 result of the lookup. Set expired FALSE, to save the outer loop executing
2584 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2585 Ustrcmp(continue_host_address, host->address) != 0))
2588 continue; /* With next host */
2591 /* Reset the default next host in case a multihomed host whose addresses
2592 are not looked up till just above added to the host list. */
2594 nexthost = host->next;
2596 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2597 domain is in queue_smtp_domains, we don't actually want to attempt any
2598 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2599 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2600 were not in it. We don't want to hold up all SMTP deliveries! Except when
2601 doing a two-stage queue run, don't do this if forcing. */
2603 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2604 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2605 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2608 for (addr = addrlist; addr != NULL; addr = addr->next)
2610 if (addr->transport_return != DEFER) continue;
2611 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2613 continue; /* With next host */
2616 /* Count hosts being considered - purely for an intelligent comment
2617 if none are usable. */
2621 /* Set $host and $host address now in case they are needed for the
2622 interface expansion or the serialize_hosts check; they remain set if an
2623 actual delivery happens. */
2625 deliver_host = host->name;
2626 deliver_host_address = host->address;
2628 /* Set up a string for adding to the retry key if the port number is not
2629 the standard SMTP port. A host may have its own port setting that overrides
2632 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2634 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2636 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2637 string changes upon expansion, we must add it to the key that is used for
2638 retries, because connections to the same host from a different interface
2639 should be treated separately. */
2641 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2642 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2645 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2647 /* The first time round the outer loop, check the status of the host by
2648 inspecting the retry data. The second time round, we are interested only
2649 in expired hosts that haven't been tried since this message arrived. */
2651 if (cutoff_retry == 0)
2653 /* Ensure the status of the address is set by checking retry data if
2654 necessary. There maybe host-specific retry data (applicable to all
2655 messages) and also data for retries of a specific message at this host.
2656 If either of these retry records are actually read, the keys used are
2657 returned to save recomputing them later. */
2659 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2660 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2662 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2663 (host->address == NULL)? US"" : host->address, pistring,
2664 (host->status == hstatus_usable)? "usable" :
2665 (host->status == hstatus_unusable)? "unusable" :
2666 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2668 /* Skip this address if not usable at this time, noting if it wasn't
2669 actually expired, both locally and in the address. */
2671 switch (host->status)
2673 case hstatus_unusable:
2675 setflag(addrlist, af_retry_skipped);
2678 case hstatus_unusable_expired:
2681 case hwhy_retry: hosts_retry++; break;
2682 case hwhy_failed: hosts_fail++; break;
2683 case hwhy_deferred: hosts_defer++; break;
2686 /* If there was a retry message key, implying that previously there
2687 was a message-specific defer, we don't want to update the list of
2688 messages waiting for these hosts. */
2690 if (retry_message_key != NULL) update_waiting = FALSE;
2691 continue; /* With the next host or IP address */
2695 /* Second time round the loop: if the address is set but expired, and
2696 the message is newer than the last try, let it through. */
2700 if (host->address == NULL ||
2701 host->status != hstatus_unusable_expired ||
2702 host->last_try > received_time)
2705 debug_printf("trying expired host %s [%s]%s\n",
2706 host->name, host->address, pistring);
2707 host_is_expired = TRUE;
2710 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2711 it remains TRUE only if all hosts are expired and none are actually tried.
2716 /* If this host is listed as one to which access must be serialized,
2717 see if another Exim process has a connection to it, and if so, skip
2718 this host. If not, update the database to record our connection to it
2719 and remember this for later deletion. Do not do any of this if we are
2720 sending the message down a pre-existing connection. */
2723 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2724 host->address, NULL) == OK)
2726 serialize_key = string_sprintf("host-serialize-%s", host->name);
2727 if (!enq_start(serialize_key))
2730 debug_printf("skipping host %s because another Exim process "
2731 "is connected to it\n", host->name);
2738 /* OK, we have an IP address that is not waiting for its retry time to
2739 arrive (it might be expired) OR (second time round the loop) we have an
2740 expired host that hasn't been tried since the message arrived. Have a go
2741 at delivering the message to it. First prepare the addresses by flushing
2742 out the result of previous attempts, and finding the first address that
2743 is still to be delivered. */
2745 first_addr = prepare_addresses(addrlist, host);
2747 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2748 message_id, host->name, host->address, addrlist->address,
2749 (addrlist->next == NULL)? "" : ", ...");
2751 set_process_info("delivering %s to %s [%s] (%s%s)",
2752 message_id, host->name, host->address, addrlist->address,
2753 (addrlist->next == NULL)? "" : ", ...");
2755 /* This is not for real; don't do the delivery. If there are
2756 any remaining hosts, list them. */
2761 set_errno(addrlist, 0, NULL, OK, FALSE);
2762 for (addr = addrlist; addr != NULL; addr = addr->next)
2764 addr->host_used = host;
2765 addr->special_action = '*';
2766 addr->message = US"delivery bypassed by -N option";
2770 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2771 "*** host and remaining hosts:\n", tblock->name);
2772 for (host2 = host; host2 != NULL; host2 = host2->next)
2773 debug_printf(" %s [%s]\n", host2->name,
2774 (host2->address == NULL)? US"unset" : host2->address);
2779 /* This is for real. If the host is expired, we don't count it for
2780 hosts_max_retry. This ensures that all hosts must expire before an address
2781 is timed out, unless hosts_max_try_hardlimit (which protects against
2782 lunatic DNS configurations) is reached.
2784 If the host is not expired and we are about to hit the hosts_max_retry
2785 limit, check to see if there is a subsequent hosts with a different MX
2786 value. If so, make that the next host, and don't count this one. This is a
2787 heuristic to make sure that different MXs do get tried. With a normal kind
2788 of retry rule, they would get tried anyway when the earlier hosts were
2789 delayed, but if the domain has a "retry every time" type of rule - as is
2790 often used for the the very large ISPs, that won't happen. */
2794 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2798 debug_printf("hosts_max_try limit reached with this host\n");
2799 for (h = host; h != NULL; h = h->next)
2800 if (h->mx != host->mx) break;
2804 unexpired_hosts_tried--;
2805 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2806 "and will be tried\n");
2810 /* Attempt the delivery. */
2812 total_hosts_tried++;
2813 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2814 expanded_hosts != NULL, &message_defer, FALSE);
2817 OK => connection made, each address contains its result;
2818 message_defer is set for message-specific defers (when all
2819 recipients are marked defer)
2820 DEFER => there was a non-message-specific delivery problem;
2821 ERROR => there was a problem setting up the arguments for a filter,
2822 or there was a problem with expanding added headers
2825 /* If the result is not OK, there was a non-message-specific problem.
2826 If the result is DEFER, we need to write to the logs saying what happened
2827 for this particular host, except in the case of authentication and TLS
2828 failures, where the log has already been written. If all hosts defer a
2829 general message is written at the end. */
2831 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2832 first_addr->basic_errno != ERRNO_TLSFAILURE)
2833 write_logs(first_addr, host);
2835 /* If STARTTLS was accepted, but there was a failure in setting up the
2836 TLS session (usually a certificate screwup), and the host is not in
2837 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2838 TLS forcibly turned off. We have to start from scratch with a new SMTP
2839 connection. That's why the retry is done from here, not from within
2840 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2841 session, so the in-clear transmission after those errors, if permitted,
2842 happens inside smtp_deliver().] */
2845 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2846 ob->tls_tempfail_tryclear &&
2847 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2848 host->address, NULL) != OK)
2850 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2851 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2852 first_addr = prepare_addresses(addrlist, host);
2853 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2854 expanded_hosts != NULL, &message_defer, TRUE);
2855 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2856 write_logs(first_addr, host);
2861 /* Delivery attempt finished */
2863 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2866 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2867 message_id, host->name, host->address, addrlist->address,
2868 (addrlist->next == NULL)? "" : " (& others)", rs);
2870 /* Release serialization if set up */
2872 if (serialized) enq_end(serialize_key);
2874 /* If the result is DEFER, or if a host retry record is known to exist, we
2875 need to add an item to the retry chain for updating the retry database
2876 at the end of delivery. We only need to add the item to the top address,
2877 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2878 for any other delivery attempts using the same address. (It is copied into
2879 the unusable tree at the outer level, so even if different address blocks
2880 contain the same address, it still won't get tried again.) */
2882 if (rc == DEFER || retry_host_key != NULL)
2884 int delete_flag = (rc != DEFER)? rf_delete : 0;
2885 if (retry_host_key == NULL)
2887 retry_host_key = ob->retry_include_ip_address?
2888 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2889 string_sprintf("T:%S%s", host->name, pistring);
2892 /* If a delivery of another message over an existing SMTP connection
2893 yields DEFER, we do NOT set up retry data for the host. This covers the
2894 case when there are delays in routing the addresses in the second message
2895 that are so long that the server times out. This is alleviated by not
2896 routing addresses that previously had routing defers when handling an
2897 existing connection, but even so, this case may occur (e.g. if a
2898 previously happily routed address starts giving routing defers). If the
2899 host is genuinely down, another non-continued message delivery will
2900 notice it soon enough. */
2902 if (delete_flag != 0 || !continuing)
2903 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2905 /* We may have tried an expired host, if its retry time has come; ensure
2906 the status reflects the expiry for the benefit of any other addresses. */
2910 host->status = (host_is_expired)?
2911 hstatus_unusable_expired : hstatus_unusable;
2912 host->why = hwhy_deferred;
2916 /* If message_defer is set (host was OK, but every recipient got deferred
2917 because of some message-specific problem), or if that had happened
2918 previously so that a message retry key exists, add an appropriate item
2919 to the retry chain. Note that if there was a message defer but now there is
2920 a host defer, the message defer record gets deleted. That seems perfectly
2921 reasonable. Also, stop the message from being remembered as waiting
2922 for specific hosts. */
2924 if (message_defer || retry_message_key != NULL)
2926 int delete_flag = message_defer? 0 : rf_delete;
2927 if (retry_message_key == NULL)
2929 retry_message_key = ob->retry_include_ip_address?
2930 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2932 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2934 retry_add_item(addrlist, retry_message_key,
2935 rf_message | rf_host | delete_flag);
2936 update_waiting = FALSE;
2939 /* Any return other than DEFER (that is, OK or ERROR) means that the
2940 addresses have got their final statuses filled in for this host. In the OK
2941 case, see if any of them are deferred. */
2945 for (addr = addrlist; addr != NULL; addr = addr->next)
2947 if (addr->transport_return == DEFER)
2949 some_deferred = TRUE;
2955 /* If no addresses deferred or the result was ERROR, return. We do this for
2956 ERROR because a failing filter set-up or add_headers expansion is likely to
2957 fail for any host we try. */
2959 if (rc == ERROR || (rc == OK && !some_deferred))
2961 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2962 return TRUE; /* Each address has its status */
2965 /* If the result was DEFER or some individual addresses deferred, let
2966 the loop run to try other hosts with the deferred addresses, except for the
2967 case when we were trying to deliver down an existing channel and failed.
2968 Don't try any other hosts in this case. */
2970 if (continuing) break;
2972 /* If the whole delivery, or some individual addresses, were deferred and
2973 there are more hosts that could be tried, do not count this host towards
2974 the hosts_max_try limit if the age of the message is greater than the
2975 maximum retry time for this host. This means we may try try all hosts,
2976 ignoring the limit, when messages have been around for some time. This is
2977 important because if we don't try all hosts, the address will never time
2978 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2980 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2983 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2985 if (retry != NULL && retry->rules != NULL)
2987 retry_rule *last_rule;
2988 for (last_rule = retry->rules;
2989 last_rule->next != NULL;
2990 last_rule = last_rule->next);
2991 timedout = time(NULL) - received_time > last_rule->timeout;
2993 else timedout = TRUE; /* No rule => timed out */
2997 unexpired_hosts_tried--;
2998 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2999 "hosts_max_try (message older than host's retry time)\n");
3002 } /* End of loop for trying multiple hosts. */
3004 /* This is the end of the loop that repeats iff expired is TRUE and
3005 ob->delay_after_cutoff is FALSE. The second time round we will
3006 try those hosts that haven't been tried since the message arrived. */
3010 debug_printf("all IP addresses skipped or deferred at least one address\n");
3011 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3012 debug_printf("retrying IP addresses not tried since message arrived\n");
3017 /* Get here if all IP addresses are skipped or defer at least one address. In
3018 MUA wrapper mode, this will happen only for connection or other non-message-
3019 specific failures. Force the delivery status for all addresses to FAIL. */
3023 for (addr = addrlist; addr != NULL; addr = addr->next)
3024 addr->transport_return = FAIL;
3028 /* In the normal, non-wrapper case, add a standard message to each deferred
3029 address if there hasn't been an error, that is, if it hasn't actually been
3030 tried this time. The variable "expired" will be FALSE if any deliveries were
3031 actually tried, or if there was at least one host that was not expired. That
3032 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3033 a delivery has been tried, an error code will be set, and the failing of the
3034 message is handled by the retry code later.
3036 If queue_smtp is set, or this transport was called to send a subsequent message
3037 down an existing TCP/IP connection, and something caused the host not to be
3038 found, we end up here, but can detect these cases and handle them specially. */
3040 for (addr = addrlist; addr != NULL; addr = addr->next)
3042 /* If host is not NULL, it means that we stopped processing the host list
3043 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3044 means we need to behave as if some hosts were skipped because their retry
3045 time had not come. Specifically, this prevents the address from timing out.
3046 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3047 hosts were tried. */
3051 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3054 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3055 "hosts were tried\n");
3060 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3061 setflag(addr, af_retry_skipped);
3065 if (queue_smtp) /* no deliveries attempted */
3067 addr->transport_return = DEFER;
3068 addr->basic_errno = 0;
3069 addr->message = US"SMTP delivery explicitly queued";
3072 else if (addr->transport_return == DEFER &&
3073 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3074 addr->message == NULL)
3076 addr->basic_errno = ERRNO_HRETRY;
3077 if (continue_hostname != NULL)
3079 addr->message = US"no host found for existing SMTP connection";
3083 setflag(addr, af_pass_message); /* This is not a security risk */
3084 addr->message = (ob->delay_after_cutoff)?
3085 US"retry time not reached for any host after a long failure period" :
3086 US"all hosts have been failing for a long time and were last tried "
3087 "after this message arrived";
3089 /* If we are already using fallback hosts, or there are no fallback hosts
3090 defined, convert the result to FAIL to cause a bounce. */
3092 if (addr->host_list == addr->fallback_hosts ||
3093 addr->fallback_hosts == NULL)
3094 addr->transport_return = FAIL;
3098 if (hosts_retry == hosts_total)
3099 addr->message = US"retry time not reached for any host";
3100 else if (hosts_fail == hosts_total)
3101 addr->message = US"all host address lookups failed permanently";
3102 else if (hosts_defer == hosts_total)
3103 addr->message = US"all host address lookups failed temporarily";
3104 else if (hosts_serial == hosts_total)
3105 addr->message = US"connection limit reached for all hosts";
3106 else if (hosts_fail+hosts_defer == hosts_total)
3107 addr->message = US"all host address lookups failed";
3108 else addr->message = US"some host address lookups failed and retry time "
3109 "not reached for other hosts or connection limit reached";
3114 /* Update the database which keeps information about which messages are waiting
3115 for which hosts to become available. For some message-specific errors, the
3116 update_waiting flag is turned off because we don't want follow-on deliveries in
3119 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3123 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3125 return TRUE; /* Each address has its status */
3128 /* End of transport/smtp.c */
git://git.exim.org / users / heiko / exim.git / blob