1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
58 { "dscp", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dscp) },
60 { "fallback_hosts", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
62 { "final_timeout", opt_time,
63 (void *)offsetof(smtp_transport_options_block, final_timeout) },
64 { "gethostbyname", opt_bool,
65 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
67 /* These are no longer honoured, as of Exim 4.80; for now, we silently
68 ignore; a later release will warn, and a later-still release will remove
69 these options, so that using them becomes an error. */
70 { "gnutls_require_kx", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
72 { "gnutls_require_mac", opt_stringptr,
73 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
74 { "gnutls_require_protocols", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 { "hosts_require_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
107 { "hosts_try_auth", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
110 { "hosts_verify_avoid_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
113 { "interface", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, interface) },
115 { "keepalive", opt_bool,
116 (void *)offsetof(smtp_transport_options_block, keepalive) },
117 { "lmtp_ignore_quota", opt_bool,
118 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
119 { "max_rcpt", opt_int | opt_public,
120 (void *)offsetof(transport_instance, max_addresses) },
121 { "multi_domain", opt_bool | opt_public,
122 (void *)offsetof(transport_instance, multi_domain) },
123 { "port", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, port) },
125 { "protocol", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, protocol) },
127 { "retry_include_ip_address", opt_bool,
128 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
129 { "serialize_hosts", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
131 { "size_addition", opt_int,
132 (void *)offsetof(smtp_transport_options_block, size_addition) }
134 ,{ "tls_certificate", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
136 { "tls_crl", opt_stringptr,
137 (void *)offsetof(smtp_transport_options_block, tls_crl) },
138 { "tls_dh_min_bits", opt_int,
139 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
140 { "tls_privatekey", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
142 { "tls_require_ciphers", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
144 { "tls_sni", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, tls_sni) },
146 { "tls_tempfail_tryclear", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
148 { "tls_verify_certificates", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
153 /* Size of the options list. An extern variable has to be used so that its
154 address can appear in the tables drtables.c. */
156 int smtp_transport_options_count =
157 sizeof(smtp_transport_options)/sizeof(optionlist);
159 /* Default private options block for the smtp transport. */
161 smtp_transport_options_block smtp_transport_option_defaults = {
163 NULL, /* fallback_hosts */
165 NULL, /* fallback_hostlist */
166 NULL, /* authenticated_sender */
167 US"$primary_hostname", /* helo_data */
168 NULL, /* interface */
170 US"smtp", /* protocol */
172 NULL, /* serialize_hosts */
173 NULL, /* hosts_try_auth */
174 NULL, /* hosts_require_auth */
175 NULL, /* hosts_require_tls */
176 NULL, /* hosts_avoid_tls */
177 US"*", /* hosts_verify_avoid_tls */
178 NULL, /* hosts_avoid_pipelining */
179 NULL, /* hosts_avoid_esmtp */
180 NULL, /* hosts_nopass_tls */
181 5*60, /* command_timeout */
182 5*60, /* connect_timeout; shorter system default overrides */
183 5*60, /* data timeout */
184 10*60, /* final timeout */
185 1024, /* size_addition */
186 5, /* hosts_max_try */
187 50, /* hosts_max_try_hardlimit */
188 TRUE, /* address_retry_include_sender */
189 FALSE, /* allow_localhost */
190 FALSE, /* authenticated_sender_force */
191 FALSE, /* gethostbyname */
192 TRUE, /* dns_qualify_single */
193 FALSE, /* dns_search_parents */
194 TRUE, /* delay_after_cutoff */
195 FALSE, /* hosts_override */
196 FALSE, /* hosts_randomize */
197 TRUE, /* keepalive */
198 FALSE, /* lmtp_ignore_quota */
199 TRUE /* retry_include_ip_address */
201 ,NULL, /* tls_certificate */
203 NULL, /* tls_privatekey */
204 NULL, /* tls_require_ciphers */
205 NULL, /* gnutls_require_kx */
206 NULL, /* gnutls_require_mac */
207 NULL, /* gnutls_require_proto */
209 NULL, /* tls_verify_certificates */
210 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
211 /* tls_dh_min_bits */
212 TRUE /* tls_tempfail_tryclear */
215 ,NULL, /* dkim_canon */
216 NULL, /* dkim_domain */
217 NULL, /* dkim_private_key */
218 NULL, /* dkim_selector */
219 NULL, /* dkim_sign_headers */
220 NULL /* dkim_strict */
227 static uschar *smtp_command; /* Points to last cmd for error messages */
228 static uschar *mail_command; /* Points to MAIL cmd for error messages */
229 static BOOL update_waiting; /* TRUE to update the "wait" database */
232 /*************************************************
233 * Setup entry point *
234 *************************************************/
236 /* This function is called when the transport is about to be used,
237 but before running it in a sub-process. It is used for two things:
239 (1) To set the fallback host list in addresses, when delivering.
240 (2) To pass back the interface, port, protocol, and other options, for use
241 during callout verification.
244 tblock pointer to the transport instance block
245 addrlist list of addresses about to be transported
246 tf if not NULL, pointer to block in which to return options
247 uid the uid that will be set (not used)
248 gid the gid that will be set (not used)
249 errmsg place for error message (not used)
251 Returns: OK always (FAIL, DEFER not used)
255 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
256 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
258 smtp_transport_options_block *ob =
259 (smtp_transport_options_block *)(tblock->options_block);
261 errmsg = errmsg; /* Keep picky compilers happy */
265 /* Pass back options if required. This interface is getting very messy. */
269 tf->interface = ob->interface;
271 tf->protocol = ob->protocol;
272 tf->hosts = ob->hosts;
273 tf->hosts_override = ob->hosts_override;
274 tf->hosts_randomize = ob->hosts_randomize;
275 tf->gethostbyname = ob->gethostbyname;
276 tf->qualify_single = ob->dns_qualify_single;
277 tf->search_parents = ob->dns_search_parents;
278 tf->helo_data = ob->helo_data;
281 /* Set the fallback host list for all the addresses that don't have fallback
282 host lists, provided that the local host wasn't present in the original host
285 if (!testflag(addrlist, af_local_host_removed))
287 for (; addrlist != NULL; addrlist = addrlist->next)
288 if (addrlist->fallback_hosts == NULL)
289 addrlist->fallback_hosts = ob->fallback_hostlist;
297 /*************************************************
298 * Initialization entry point *
299 *************************************************/
301 /* Called for each instance, after its options have been read, to
302 enable consistency checks to be done, or anything else that needs
305 Argument: pointer to the transport instance block
310 smtp_transport_init(transport_instance *tblock)
312 smtp_transport_options_block *ob =
313 (smtp_transport_options_block *)(tblock->options_block);
315 /* Retry_use_local_part defaults FALSE if unset */
317 if (tblock->retry_use_local_part == TRUE_UNSET)
318 tblock->retry_use_local_part = FALSE;
320 /* Set the default port according to the protocol */
322 if (ob->port == NULL)
323 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
324 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
326 /* Set up the setup entry point, to be called before subprocesses for this
329 tblock->setup = smtp_transport_setup;
331 /* Complain if any of the timeouts are zero. */
333 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
334 ob->final_timeout <= 0)
335 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
336 "command, data, or final timeout value is zero for %s transport",
339 /* If hosts_override is set and there are local hosts, set the global
340 flag that stops verify from showing router hosts. */
342 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
344 /* If there are any fallback hosts listed, build a chain of host items
345 for them, but do not do any lookups at this time. */
347 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
354 /*************************************************
355 * Set delivery info into all active addresses *
356 *************************************************/
358 /* Only addresses whose status is >= PENDING are relevant. A lesser
359 status means that an address is not currently being processed.
362 addrlist points to a chain of addresses
363 errno_value to put in each address's errno field
364 msg to put in each address's message field
365 rc to put in each address's transport_return field
366 pass_message if TRUE, set the "pass message" flag in the address
368 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
369 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
370 this particular type of timeout.
376 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
381 if (errno_value == ERRNO_CONNECTTIMEOUT)
383 errno_value = ETIMEDOUT;
384 orvalue = RTEF_CTOUT;
386 for (addr = addrlist; addr != NULL; addr = addr->next)
388 if (addr->transport_return < PENDING) continue;
389 addr->basic_errno = errno_value;
390 addr->more_errno |= orvalue;
394 if (pass_message) setflag(addr, af_pass_message);
396 addr->transport_return = rc;
402 /*************************************************
403 * Check an SMTP response *
404 *************************************************/
406 /* This function is given an errno code and the SMTP response buffer
407 to analyse, together with the host identification for generating messages. It
408 sets an appropriate message and puts the first digit of the response code into
409 the yield variable. If no response was actually read, a suitable digit is
413 host the current host, to get its name for messages
414 errno_value pointer to the errno value
415 more_errno from the top address for use with ERRNO_FILTER_FAIL
416 buffer the SMTP response buffer
417 yield where to put a one-digit SMTP response code
418 message where to put an errror message
419 pass_message set TRUE if message is an SMTP response
421 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
424 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
425 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
429 if (smtp_use_pipelining &&
430 (Ustrcmp(smtp_command, "MAIL") == 0 ||
431 Ustrcmp(smtp_command, "RCPT") == 0 ||
432 Ustrcmp(smtp_command, "DATA") == 0))
435 *yield = '4'; /* Default setting is to give a temporary error */
437 /* Handle response timeout */
439 if (*errno_value == ETIMEDOUT)
441 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
442 "after %s%s", host->name, host->address, pl, smtp_command);
443 if (transport_count > 0)
444 *message = US string_sprintf("%s (%d bytes written)", *message,
449 /* Handle malformed SMTP response */
451 if (*errno_value == ERRNO_SMTPFORMAT)
453 uschar *malfresp = string_printing(buffer);
454 while (isspace(*malfresp)) malfresp++;
456 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
457 "%s [%s] in response to %s%s", host->name, host->address, pl,
460 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
461 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
465 /* Handle a failed filter process error; can't send QUIT as we mustn't
468 if (*errno_value == ERRNO_FILTER_FAIL)
470 *message = US string_sprintf("transport filter process failed (%d)%s",
472 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
476 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
479 if (*errno_value == ERRNO_CHHEADER_FAIL)
482 US string_sprintf("failed to expand headers_add or headers_remove: %s",
483 expand_string_message);
487 /* Handle failure to write a complete data block */
489 if (*errno_value == ERRNO_WRITEINCOMPLETE)
491 *message = US string_sprintf("failed to write a data block");
495 /* Handle error responses from the remote mailer. */
499 uschar *s = string_printing(buffer);
500 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
501 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
502 *pass_message = TRUE;
507 /* No data was read. If there is no errno, this must be the EOF (i.e.
508 connection closed) case, which causes deferral. An explicit connection reset
509 error has the same effect. Otherwise, put the host's identity in the message,
510 leaving the errno value to be interpreted as well. In all cases, we have to
511 assume the connection is now dead. */
513 if (*errno_value == 0 || *errno_value == ECONNRESET)
515 *errno_value = ERRNO_SMTPCLOSED;
516 *message = US string_sprintf("Remote host %s [%s] closed connection "
517 "in response to %s%s", host->name, host->address, pl, smtp_command);
519 else *message = US string_sprintf("%s [%s]", host->name, host->address);
526 /*************************************************
527 * Write error message to logs *
528 *************************************************/
530 /* This writes to the main log and to the message log.
533 addr the address item containing error information
534 host the current host
540 write_logs(address_item *addr, host_item *host)
542 if (addr->message != NULL)
544 uschar *message = addr->message;
545 if (addr->basic_errno > 0)
546 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
547 log_write(0, LOG_MAIN, "%s", message);
548 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
553 ((log_extra_selector & LX_outgoing_port) != 0)?
554 string_sprintf("%s [%s]:%d", host->name, host->address,
555 (host->port == PORT_NONE)? 25 : host->port)
557 string_sprintf("%s [%s]", host->name, host->address);
558 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
559 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
560 strerror(addr->basic_errno));
566 /*************************************************
567 * Synchronize SMTP responses *
568 *************************************************/
570 /* This function is called from smtp_deliver() to receive SMTP responses from
571 the server, and match them up with the commands to which they relate. When
572 PIPELINING is not in use, this function is called after every command, and is
573 therefore somewhat over-engineered, but it is simpler to use a single scheme
574 that works both with and without PIPELINING instead of having two separate sets
577 The set of commands that are buffered up with pipelining may start with MAIL
578 and may end with DATA; in between are RCPT commands that correspond to the
579 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
580 etc.) are never buffered.
582 Errors after MAIL or DATA abort the whole process leaving the response in the
583 buffer. After MAIL, pending responses are flushed, and the original command is
584 re-instated in big_buffer for error messages. For RCPT commands, the remote is
585 permitted to reject some recipient addresses while accepting others. However
586 certain errors clearly abort the whole process. Set the value in
587 transport_return to PENDING_OK if the address is accepted. If there is a
588 subsequent general error, it will get reset accordingly. If not, it will get
589 converted to OK at the end.
592 addrlist the complete address list
593 include_affixes TRUE if affixes include in RCPT
594 sync_addr ptr to the ptr of the one to start scanning at (updated)
595 host the host we are connected to
596 count the number of responses to read
598 include_sender true if 4xx retry is to include the sender it its key
599 pending_MAIL true if the first response is for MAIL
600 pending_DATA 0 if last command sent was not DATA
601 +1 if previously had a good recipient
602 -1 if not previously had a good recipient
603 inblock incoming SMTP block
604 timeout timeout value
605 buffer buffer for reading response
606 buffsize size of buffer
608 Returns: 3 if at least one address had 2xx and one had 5xx
609 2 if at least one address had 5xx but none had 2xx
610 1 if at least one host had a 2xx response, but none had 5xx
611 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
612 -1 timeout while reading RCPT response
613 -2 I/O or other non-response error for RCPT
614 -3 DATA or MAIL failed - errno and buffer set
618 sync_responses(address_item *addrlist, BOOL include_affixes,
619 address_item **sync_addr, host_item *host, int count,
620 BOOL address_retry_include_sender, BOOL pending_MAIL,
621 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
624 address_item *addr = *sync_addr;
627 /* Handle the response for a MAIL command. On error, reinstate the original
628 command in big_buffer for error message use, and flush any further pending
629 responses before returning, except after I/O errors and timeouts. */
634 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
636 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
637 if (errno == 0 && buffer[0] != 0)
639 uschar flushbuffer[4096];
641 if (buffer[0] == '4')
643 save_errno = ERRNO_MAIL4XX;
644 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
648 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
650 && (errno != 0 || flushbuffer[0] == 0))
659 if (pending_DATA) count--; /* Number of RCPT responses to come */
661 /* Read and handle the required number of RCPT responses, matching each one up
662 with an address by scanning for the next address whose status is PENDING_DEFER.
667 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
669 /* The address was accepted */
671 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
674 addr->transport_return = PENDING_OK;
676 /* If af_dr_retry_exists is set, there was a routing delay on this address;
677 ensure that any address-specific retry record is expunged. We do this both
678 for the basic key and for the version that also includes the sender. */
680 if (testflag(addr, af_dr_retry_exists))
682 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
684 retry_add_item(addr, altkey, rf_delete);
685 retry_add_item(addr, addr->address_retry_key, rf_delete);
689 /* Timeout while reading the response */
691 else if (errno == ETIMEDOUT)
693 int save_errno = errno;
694 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
695 "after RCPT TO:<%s>", host->name, host->address,
696 transport_rcpt_address(addr, include_affixes));
697 set_errno(addrlist, save_errno, message, DEFER, FALSE);
698 retry_add_item(addr, addr->address_retry_key, 0);
699 update_waiting = FALSE;
703 /* Handle other errors in obtaining an SMTP response by returning -1. This
704 will cause all the addresses to be deferred. Restore the SMTP command in
705 big_buffer for which we are checking the response, so the error message
708 else if (errno != 0 || buffer[0] == 0)
710 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
711 transport_rcpt_address(addr, include_affixes));
715 /* Handle SMTP permanent and temporary response codes. */
720 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
721 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
722 host->name, host->address, string_printing(buffer));
723 setflag(addr, af_pass_message);
724 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
726 /* The response was 5xx */
728 if (buffer[0] == '5')
730 addr->transport_return = FAIL;
734 /* The response was 4xx */
738 addr->transport_return = DEFER;
739 addr->basic_errno = ERRNO_RCPT4XX;
740 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
742 /* Log temporary errors if there are more hosts to be tried. */
744 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
746 /* Do not put this message on the list of those waiting for specific
747 hosts, as otherwise it is likely to be tried too often. */
749 update_waiting = FALSE;
751 /* Add a retry item for the address so that it doesn't get tried again
752 too soon. If address_retry_include_sender is true, add the sender address
755 if (address_retry_include_sender)
757 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
759 retry_add_item(addr, altkey, 0);
761 else retry_add_item(addr, addr->address_retry_key, 0);
764 } /* Loop for next RCPT response */
766 /* Update where to start at for the next block of responses, unless we
767 have already handled all the addresses. */
769 if (addr != NULL) *sync_addr = addr->next;
771 /* Handle a response to DATA. If we have not had any good recipients, either
772 previously or in this block, the response is ignored. */
774 if (pending_DATA != 0 &&
775 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
780 if (pending_DATA > 0 || (yield & 1) != 0)
782 if (errno == 0 && buffer[0] == '4')
784 errno = ERRNO_DATA4XX;
785 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
789 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
790 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
791 "is in use and there were no good recipients\n", msg);
794 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
795 present) received 3xx. If any RCPTs were handled and yielded anything other
796 than 4xx, yield will be set non-zero. */
803 /*************************************************
804 * Deliver address list to given host *
805 *************************************************/
807 /* If continue_hostname is not null, we get here only when continuing to
808 deliver down an existing channel. The channel was passed as the standard
809 input. TLS is never active on a passed channel; the previous process always
810 closes it down before passing the connection on.
812 Otherwise, we have to make a connection to the remote host, and do the
813 initial protocol exchange.
815 When running as an MUA wrapper, if the sender or any recipient is rejected,
816 temporarily or permanently, we force failure for all recipients.
819 addrlist chain of potential addresses to deliver; only those whose
820 transport_return field is set to PENDING_DEFER are currently
821 being processed; others should be skipped - they have either
822 been delivered to an earlier host or IP address, or been
823 failed by one of them.
824 host host to deliver to
825 host_af AF_INET or AF_INET6
826 port default TCP/IP port to use, in host byte order
827 interface interface to bind to, or NULL
828 tblock transport instance block
829 copy_host TRUE if host set in addr->host_used must be copied, because
830 it is specific to this call of the transport
831 message_defer set TRUE if yield is OK, but all addresses were deferred
832 because of a non-recipient, non-host failure, that is, a
833 4xx response to MAIL FROM, DATA, or ".". This is a defer
834 that is specific to the message.
835 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
836 a second attempt after TLS initialization fails
838 Returns: OK - the connection was made and the delivery attempted;
839 the result for each address is in its data block.
840 DEFER - the connection could not be made, or something failed
841 while setting up the SMTP session, or there was a
842 non-message-specific error, such as a timeout.
843 ERROR - a filter command is specified for this transport,
844 and there was a problem setting it up; OR helo_data
845 or add_headers or authenticated_sender is specified
846 for this transport, and the string failed to expand
850 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
851 uschar *interface, transport_instance *tblock, BOOL copy_host,
852 BOOL *message_defer, BOOL suppress_tls)
855 address_item *sync_addr;
856 address_item *first_addr = addrlist;
861 time_t start_delivery_time = time(NULL);
862 smtp_transport_options_block *ob =
863 (smtp_transport_options_block *)(tblock->options_block);
864 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
865 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
867 BOOL send_rset = TRUE;
868 BOOL send_quit = TRUE;
869 BOOL setting_up = TRUE;
870 BOOL completed_address = FALSE;
873 BOOL pass_message = FALSE;
874 smtp_inblock inblock;
875 smtp_outblock outblock;
876 int max_rcpt = tblock->max_addresses;
877 uschar *igquotstr = US"";
878 uschar *local_authenticated_sender = authenticated_sender;
879 uschar *helo_data = NULL;
880 uschar *message = NULL;
881 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
884 uschar inbuffer[4096];
885 uschar outbuffer[1024];
887 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
889 *message_defer = FALSE;
890 smtp_command = US"initial connection";
891 if (max_rcpt == 0) max_rcpt = 999999;
893 /* Set up the buffer for reading SMTP response packets. */
895 inblock.buffer = inbuffer;
896 inblock.buffersize = sizeof(inbuffer);
897 inblock.ptr = inbuffer;
898 inblock.ptrend = inbuffer;
900 /* Set up the buffer for holding SMTP commands while pipelining */
902 outblock.buffer = outbuffer;
903 outblock.buffersize = sizeof(outbuffer);
904 outblock.ptr = outbuffer;
905 outblock.cmd_count = 0;
906 outblock.authenticating = FALSE;
908 /* Reset the parameters of a TLS session. */
911 tls_in.cipher = NULL; /* for back-compatible behaviour */
912 tls_in.peerdn = NULL;
913 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
918 tls_out.cipher = NULL; /* the one we may use for this transport */
919 tls_out.peerdn = NULL;
920 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
927 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
932 /* Make a connection to the host if this isn't a continued delivery, and handle
933 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
934 specially so they can be identified for retries. */
936 if (continue_hostname == NULL)
938 inblock.sock = outblock.sock =
939 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
940 ob->keepalive, ob->dscp); /* This puts port into host->port */
942 if (inblock.sock < 0)
944 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
949 /* Expand the greeting message while waiting for the initial response. (Makes
950 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
951 delayed till here so that $sending_interface and $sending_port are set. */
953 helo_data = expand_string(ob->helo_data);
955 /* The first thing is to wait for an initial OK response. The dreaded "goto"
956 is nevertheless a reasonably clean way of programming this kind of logic,
957 where you want to escape on any error. */
961 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
962 ob->command_timeout)) goto RESPONSE_FAILED;
964 /* Now check if the helo_data expansion went well, and sign off cleanly if
967 if (helo_data == NULL)
969 uschar *message = string_sprintf("failed to expand helo_data: %s",
970 expand_string_message);
971 set_errno(addrlist, 0, message, DEFER, FALSE);
977 /** Debugging without sending a message
978 addrlist->transport_return = DEFER;
982 /* Errors that occur after this point follow an SMTP command, which is
983 left in big_buffer by smtp_write_command() for use in error messages. */
985 smtp_command = big_buffer;
987 /* Tell the remote who we are...
989 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
990 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
991 greeting is of this form. The assumption was that the far end supports it
992 properly... but experience shows that there are some that give 5xx responses,
993 even though the banner includes "ESMTP" (there's a bloody-minded one that
994 says "ESMTP not spoken here"). Cope with that case.
996 September 2000: Time has passed, and it seems reasonable now to always send
997 EHLO at the start. It is also convenient to make the change while installing
1000 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1001 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1002 would be no way to send out the mails, so there is now a host list
1003 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1004 PIPELINING problem as well. Maybe it can also be useful to cure other
1005 problems with broken servers.
1007 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1008 Then somebody tried it with a Microsoft mailer... It seems that all other
1009 mailers use upper case for some reason (the RFC is quite clear about case
1010 independence) so, for peace of mind, I gave in. */
1012 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1013 host->name, host->address, NULL) != OK;
1015 /* Alas; be careful, since this goto is not an error-out, so conceivably
1016 we might set data between here and the target which we assume to exist
1017 and be usable. I can see this coming back to bite us. */
1022 suppress_tls = FALSE;
1023 ob->tls_tempfail_tryclear = FALSE;
1024 smtp_command = US"SSL-on-connect";
1031 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1032 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1034 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1035 ob->command_timeout))
1037 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1044 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1049 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1051 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1052 ob->command_timeout)) goto RESPONSE_FAILED;
1055 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1056 lmtp_ignore_quota option was set. */
1058 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1059 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1060 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1062 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1065 tls_offered = esmtp &&
1066 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1067 PCRE_EOPT, NULL, 0) >= 0;
1071 /* For continuing deliveries down the same channel, the socket is the standard
1072 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1073 below). Set up the pointer to where subsequent commands will be left, for
1074 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1075 set from the command line if they were set in the process that passed the
1080 inblock.sock = outblock.sock = fileno(stdin);
1081 smtp_command = big_buffer;
1082 host->port = port; /* Record the port that was used */
1085 /* If TLS is available on this connection, whether continued or not, attempt to
1086 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1087 send another EHLO - the server may give a different answer in secure mode. We
1088 use a separate buffer for reading the response to STARTTLS so that if it is
1089 negative, the original EHLO data is available for subsequent analysis, should
1090 the client not be required to use TLS. If the response is bad, copy the buffer
1091 for error analysis. */
1094 if (tls_offered && !suppress_tls &&
1095 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1096 host->address, NULL) != OK)
1098 uschar buffer2[4096];
1099 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1102 /* If there is an I/O error, transmission of this message is deferred. If
1103 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1104 false, we also defer. However, if there is a temporary rejection of STARTTLS
1105 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1106 STARTTLS, we carry on. This means we will try to send the message in clear,
1107 unless the host is in hosts_require_tls (tested below). */
1109 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1110 ob->command_timeout))
1112 if (errno != 0 || buffer2[0] == 0 ||
1113 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1115 Ustrncpy(buffer, buffer2, sizeof(buffer));
1116 goto RESPONSE_FAILED;
1120 /* STARTTLS accepted: try to negotiate a TLS session. */
1125 int rc = tls_client_start(inblock.sock,
1128 NULL, /* No DH param */
1129 ob->tls_certificate,
1132 ob->tls_verify_certificates,
1134 ob->tls_require_ciphers,
1135 ob->tls_dh_min_bits,
1136 ob->command_timeout);
1138 /* TLS negotiation failed; give an error. From outside, this function may
1139 be called again to try in clear on a new connection, if the options permit
1140 it for this host. */
1144 save_errno = ERRNO_TLSFAILURE;
1145 message = US"failure while setting up TLS session";
1150 /* TLS session is set up */
1152 for (addr = addrlist; addr != NULL; addr = addr->next)
1154 if (addr->transport_return == PENDING_DEFER)
1156 addr->cipher = tls_out.cipher;
1157 addr->peerdn = tls_out.peerdn;
1163 /* if smtps, we'll have smtp_command set to something else; always safe to
1165 smtp_command = big_buffer;
1167 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1168 helo_data is null, we are dealing with a connection that was passed from
1169 another process, and so we won't have expanded helo_data above. We have to
1170 expand it here. $sending_ip_address and $sending_port are set up right at the
1171 start of the Exim process (in exim.c). */
1173 if (tls_out.active >= 0)
1176 if (helo_data == NULL)
1178 helo_data = expand_string(ob->helo_data);
1179 if (helo_data == NULL)
1181 uschar *message = string_sprintf("failed to expand helo_data: %s",
1182 expand_string_message);
1183 set_errno(addrlist, 0, message, DEFER, FALSE);
1189 /* For SMTPS we need to wait for the initial OK response. */
1192 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1193 ob->command_timeout)) goto RESPONSE_FAILED;
1197 greeting_cmd = "EHLO";
1200 greeting_cmd = "HELO";
1202 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1205 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1206 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1208 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1209 ob->command_timeout))
1210 goto RESPONSE_FAILED;
1213 /* If the host is required to use a secure channel, ensure that we
1216 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1217 host->address, NULL) == OK)
1219 save_errno = ERRNO_TLSREQUIRED;
1220 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1221 host->name, host->address,
1222 tls_offered? "an attempt to start TLS failed" :
1223 "the server did not offer TLS support");
1228 /* If TLS is active, we have just started it up and re-done the EHLO command,
1229 so its response needs to be analyzed. If TLS is not active and this is a
1230 continued session down a previously-used socket, we haven't just done EHLO, so
1233 if (continue_hostname == NULL
1235 || tls_out.active >= 0
1240 uschar *fail_reason = US"server did not advertise AUTH support";
1242 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1243 lmtp_ignore_quota option was set. */
1245 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1246 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1247 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1249 /* If the response to EHLO specified support for the SIZE parameter, note
1250 this, provided size_addition is non-negative. */
1252 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1253 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1254 PCRE_EOPT, NULL, 0) >= 0;
1256 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1257 the current host, esmtp will be false, so PIPELINING can never be used. If
1258 the current host matches hosts_avoid_pipelining, don't do it. */
1260 smtp_use_pipelining = esmtp &&
1261 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1262 host->address, NULL) != OK &&
1263 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1264 PCRE_EOPT, NULL, 0) >= 0;
1266 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1267 smtp_use_pipelining? "" : "not ");
1269 /* Note if the response to EHLO specifies support for the AUTH extension.
1270 If it has, check that this host is one we want to authenticate to, and do
1271 the business. The host name and address must be available when the
1272 authenticator's client driver is running. */
1274 smtp_authenticated = FALSE;
1275 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1276 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1277 host->name, host->address, NULL);
1279 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1281 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1282 expand_nmax = -1; /* reset */
1284 /* Must not do this check until after we have saved the result of the
1285 regex match above. */
1287 if (require_auth == OK ||
1288 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1289 host->address, NULL) == OK)
1292 fail_reason = US"no common mechanisms were found";
1294 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1296 /* Scan the configured authenticators looking for one which is configured
1297 for use as a client, which is not suppressed by client_condition, and
1298 whose name matches an authentication mechanism supported by the server.
1299 If one is found, attempt to authenticate by calling its client function.
1302 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1306 (au->client_condition != NULL &&
1307 !expand_check_condition(au->client_condition, au->name,
1308 US"client authenticator")))
1310 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1312 (au->client)? "client_condition is false" :
1313 "not configured as a client");
1317 /* Loop to scan supported server mechanisms */
1322 int len = Ustrlen(au->public_name);
1323 while (isspace(*p)) p++;
1325 if (strncmpic(au->public_name, p, len) != 0 ||
1326 (p[len] != 0 && !isspace(p[len])))
1328 while (*p != 0 && !isspace(*p)) p++;
1332 /* Found data for a listed mechanism. Call its client entry. Set
1333 a flag in the outblock so that data is overwritten after sending so
1334 that reflections don't show it. */
1336 fail_reason = US"authentication attempt(s) failed";
1337 outblock.authenticating = TRUE;
1338 rc = (au->info->clientcode)(au, &inblock, &outblock,
1339 ob->command_timeout, buffer, sizeof(buffer));
1340 outblock.authenticating = FALSE;
1341 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1344 /* A temporary authentication failure must hold up delivery to
1345 this host. After a permanent authentication failure, we carry on
1346 to try other authentication methods. If all fail hard, try to
1347 deliver the message unauthenticated unless require_auth was set. */
1352 smtp_authenticated = TRUE; /* stops the outer loop */
1353 client_authenticator = au->name;
1354 if (au->set_client_id != NULL)
1355 client_authenticated_id = expand_string(au->set_client_id);
1358 /* Failure after writing a command */
1363 /* Failure after reading a response */
1366 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1367 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1368 au->name, host->name, host->address, buffer);
1371 /* Failure by some other means. In effect, the authenticator
1372 decided it wasn't prepared to handle this case. Typically this
1373 is the result of "fail" in an expansion string. Do we need to
1374 log anything here? Feb 2006: a message is now put in the buffer
1375 if logging is required. */
1379 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1380 "authentication H=%s [%s] %s", au->name, host->name,
1381 host->address, buffer);
1384 /* Internal problem, message in buffer. */
1388 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1392 break; /* If not authenticated, try next authenticator */
1393 } /* Loop for scanning supported server mechanisms */
1394 } /* Loop for further authenticators */
1398 /* If we haven't authenticated, but are required to, give up. */
1400 if (require_auth == OK && !smtp_authenticated)
1403 set_errno(addrlist, ERRNO_AUTHFAIL,
1404 string_sprintf("authentication required but %s", fail_reason), DEFER,
1410 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1411 message-specific. */
1415 /* If there is a filter command specified for this transport, we can now
1416 set it up. This cannot be done until the identify of the host is known. */
1418 if (tblock->filter_command != NULL)
1422 sprintf(CS buffer, "%.50s transport", tblock->name);
1423 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1424 TRUE, DEFER, addrlist, buffer, NULL);
1425 transport_filter_timeout = tblock->filter_timeout;
1427 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1432 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1440 /* For messages that have more than the maximum number of envelope recipients,
1441 we want to send several transactions down the same SMTP connection. (See
1442 comments in deliver.c as to how this reconciles, heuristically, with
1443 remote_max_parallel.) This optimization was added to Exim after the following
1444 code was already working. The simplest way to put it in without disturbing the
1445 code was to use a goto to jump back to this point when there is another
1446 transaction to handle. */
1449 sync_addr = first_addr;
1453 completed_address = FALSE;
1456 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1457 qualification, send it, adding something to the message size to allow for
1458 imprecision and things that get added en route. Exim keeps the number of lines
1459 in a message, so we can give an accurate value for the original message, but we
1460 need some additional to handle added headers. (Double "." characters don't get
1461 included in the count.) */
1468 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1472 /* If an authenticated_sender override has been specified for this transport
1473 instance, expand it. If the expansion is forced to fail, and there was already
1474 an authenticated_sender for this message, the original value will be used.
1475 Other expansion failures are serious. An empty result is ignored, but there is
1476 otherwise no check - this feature is expected to be used with LMTP and other
1477 cases where non-standard addresses (e.g. without domains) might be required. */
1479 if (ob->authenticated_sender != NULL)
1481 uschar *new = expand_string(ob->authenticated_sender);
1484 if (!expand_string_forcedfail)
1486 uschar *message = string_sprintf("failed to expand "
1487 "authenticated_sender: %s", expand_string_message);
1488 set_errno(addrlist, 0, message, DEFER, FALSE);
1492 else if (new[0] != 0) local_authenticated_sender = new;
1495 /* Add the authenticated sender address if present */
1497 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1498 local_authenticated_sender != NULL)
1500 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1501 auth_xtextencode(local_authenticated_sender,
1502 Ustrlen(local_authenticated_sender)));
1503 client_authenticated_sender = string_copy(local_authenticated_sender);
1506 /* From here until we send the DATA command, we can make use of PIPELINING
1507 if the server host supports it. The code has to be able to check the responses
1508 at any point, for when the buffer fills up, so we write it totally generally.
1509 When PIPELINING is off, each command written reports that it has flushed the
1512 pending_MAIL = TRUE; /* The block starts with MAIL */
1514 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1515 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1516 mail_command = string_copy(big_buffer); /* Save for later error message */
1520 case -1: /* Transmission error */
1523 case +1: /* Block was sent */
1524 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1525 ob->command_timeout))
1527 if (errno == 0 && buffer[0] == '4')
1529 errno = ERRNO_MAIL4XX;
1530 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1532 goto RESPONSE_FAILED;
1534 pending_MAIL = FALSE;
1538 /* Pass over all the relevant recipient addresses for this host, which are the
1539 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1540 several before we have to read the responses for those seen so far. This
1541 checking is done by a subroutine because it also needs to be done at the end.
1542 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1543 the next one if not all are sent.
1545 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1546 last address because we want to abort if any recipients have any kind of
1547 problem, temporary or permanent. We know that all recipient addresses will have
1548 the PENDING_DEFER status, because only one attempt is ever made, and we know
1549 that max_rcpt will be large, so all addresses will be done at once. */
1551 for (addr = first_addr;
1552 address_count < max_rcpt && addr != NULL;
1558 if (addr->transport_return != PENDING_DEFER) continue;
1561 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1563 /* Now send the RCPT command, and process outstanding responses when
1564 necessary. After a timeout on RCPT, we just end the function, leaving the
1565 yield as OK, because this error can often mean that there is a problem with
1566 just one address, so we don't want to delay the host. */
1568 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1569 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1570 if (count < 0) goto SEND_FAILED;
1573 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1574 &sync_addr, host, count, ob->address_retry_include_sender,
1575 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1578 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1579 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1582 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1583 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1584 case 0: /* No 2xx or 5xx, but no probs */
1587 case -1: goto END_OFF; /* Timeout on RCPT */
1588 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1590 pending_MAIL = FALSE; /* Dealt with MAIL */
1592 } /* Loop for next address */
1594 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1595 permanently or temporarily. We should have flushed and synced after the last
1600 address_item *badaddr;
1601 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1603 if (badaddr->transport_return != PENDING_OK) break;
1605 if (badaddr != NULL)
1607 set_errno(addrlist, 0, badaddr->message, FAIL,
1608 testflag(badaddr, af_pass_message));
1613 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1614 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1615 have a good recipient buffered up if we are pipelining. We don't want to waste
1616 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1617 are pipelining. The responses are all handled by sync_responses(). */
1619 if (ok || (smtp_use_pipelining && !mua_wrapper))
1621 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1622 if (count < 0) goto SEND_FAILED;
1623 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1624 host, count, ob->address_retry_include_sender, pending_MAIL,
1625 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1627 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1628 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1631 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1632 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1633 case 0: break; /* No 2xx or 5xx, but no probs */
1635 case -1: goto END_OFF; /* Timeout on RCPT */
1636 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1640 /* Save the first address of the next batch. */
1644 /* If there were no good recipients (but otherwise there have been no
1645 problems), just set ok TRUE, since we have handled address-specific errors
1646 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1647 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1648 well as body. Set the appropriate timeout value to be used for each chunk.
1649 (Haven't been able to make it work using select() for writing yet.) */
1651 if (!ok) ok = TRUE; else
1653 sigalrm_seen = FALSE;
1654 transport_write_timeout = ob->data_timeout;
1655 smtp_command = US"sending data block"; /* For error messages */
1656 DEBUG(D_transport|D_v)
1657 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1658 transport_count = 0;
1659 #ifndef DISABLE_DKIM
1660 ok = dkim_transport_write_message(addrlist, inblock.sock,
1661 topt_use_crlf | topt_end_dot | topt_escape_headers |
1662 (tblock->body_only? topt_no_headers : 0) |
1663 (tblock->headers_only? topt_no_body : 0) |
1664 (tblock->return_path_add? topt_add_return_path : 0) |
1665 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1666 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1667 0, /* No size limit */
1668 tblock->add_headers, tblock->remove_headers,
1669 US".", US"..", /* Escaping strings */
1670 tblock->rewrite_rules, tblock->rewrite_existflags,
1671 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1672 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1675 ok = transport_write_message(addrlist, inblock.sock,
1676 topt_use_crlf | topt_end_dot | topt_escape_headers |
1677 (tblock->body_only? topt_no_headers : 0) |
1678 (tblock->headers_only? topt_no_body : 0) |
1679 (tblock->return_path_add? topt_add_return_path : 0) |
1680 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1681 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1682 0, /* No size limit */
1683 tblock->add_headers, tblock->remove_headers,
1684 US".", US"..", /* Escaping strings */
1685 tblock->rewrite_rules, tblock->rewrite_existflags);
1688 /* transport_write_message() uses write() because it is called from other
1689 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1690 it can exit with "Broken pipe" as its error. This really means that the
1691 socket got closed at the far end. */
1693 transport_write_timeout = 0; /* for subsequent transports */
1695 /* Failure can either be some kind of I/O disaster (including timeout),
1696 or the failure of a transport filter or the expansion of added headers. */
1700 buffer[0] = 0; /* There hasn't been a response */
1701 goto RESPONSE_FAILED;
1704 /* We used to send the terminating "." explicitly here, but because of
1705 buffering effects at both ends of TCP/IP connections, you don't gain
1706 anything by keeping it separate, so it might as well go in the final
1707 data buffer for efficiency. This is now done by setting the topt_end_dot
1710 smtp_command = US"end of data";
1712 /* For SMTP, we now read a single response that applies to the whole message.
1713 If it is OK, then all the addresses have been delivered. */
1717 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1719 if (!ok && errno == 0 && buffer[0] == '4')
1721 errno = ERRNO_DATA4XX;
1722 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1726 /* For LMTP, we get back a response for every RCPT command that we sent;
1727 some may be accepted and some rejected. For those that get a response, their
1728 status is fixed; any that are accepted have been handed over, even if later
1729 responses crash - at least, that's how I read RFC 2033.
1731 If all went well, mark the recipient addresses as completed, record which
1732 host/IPaddress they were delivered to, and cut out RSET when sending another
1733 message down the same channel. Write the completed addresses to the journal
1734 now so that they are recorded in case there is a crash of hardware or
1735 software before the spool gets updated. Also record the final SMTP
1736 confirmation if needed (for SMTP only). */
1741 int delivery_time = (int)(time(NULL) - start_delivery_time);
1744 uschar *conf = NULL;
1747 /* Make a copy of the host if it is local to this invocation
1748 of the transport. */
1752 thost = store_get(sizeof(host_item));
1754 thost->name = string_copy(host->name);
1755 thost->address = string_copy(host->address);
1759 /* Set up confirmation if needed - applies only to SMTP */
1761 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1763 uschar *s = string_printing(buffer);
1764 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1767 /* Process all transported addresses - for LMTP, read a status for
1770 for (addr = addrlist; addr != first_addr; addr = addr->next)
1772 if (addr->transport_return != PENDING_OK) continue;
1774 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1775 remaining addresses. Otherwise, it's a return code for just the one
1776 address. For temporary errors, add a retry item for the address so that
1777 it doesn't get tried again too soon. */
1781 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1784 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1785 addr->message = string_sprintf("LMTP error after %s: %s",
1786 big_buffer, string_printing(buffer));
1787 setflag(addr, af_pass_message); /* Allow message to go to user */
1788 if (buffer[0] == '5')
1789 addr->transport_return = FAIL;
1792 errno = ERRNO_DATA4XX;
1793 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1794 addr->transport_return = DEFER;
1795 retry_add_item(addr, addr->address_retry_key, 0);
1799 completed_address = TRUE; /* NOW we can set this flag */
1800 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1802 uschar *s = string_printing(buffer);
1803 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1807 /* SMTP, or success return from LMTP for this address. Pass back the
1808 actual host that was used. */
1810 addr->transport_return = OK;
1811 addr->more_errno = delivery_time;
1812 addr->host_used = thost;
1813 addr->special_action = flag;
1814 addr->message = conf;
1817 /* Update the journal. For homonymic addresses, use the base address plus
1818 the transport name. See lots of comments in deliver.c about the reasons
1819 for the complications when homonyms are involved. Just carry on after
1820 write error, as it may prove possible to update the spool file later. */
1822 if (testflag(addr, af_homonym))
1823 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1825 sprintf(CS buffer, "%.500s\n", addr->unique);
1827 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1828 len = Ustrlen(CS buffer);
1829 if (write(journal_fd, buffer, len) != len)
1830 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1831 "%s: %s", buffer, strerror(errno));
1834 /* Ensure the journal file is pushed out to disk. */
1836 if (EXIMfsync(journal_fd) < 0)
1837 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1843 /* Handle general (not specific to one address) failures here. The value of ok
1844 is used to skip over this code on the falling through case. A timeout causes a
1845 deferral. Other errors may defer or fail according to the response code, and
1846 may set up a special errno value, e.g. after connection chopped, which is
1847 assumed if errno == 0 and there is no text in the buffer. If control reaches
1848 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1849 the problem is not related to this specific message. */
1858 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1859 buffer, &code, &message, &pass_message);
1865 message = US string_sprintf("send() to %s [%s] failed: %s",
1866 host->name, host->address, strerror(save_errno));
1870 /* This label is jumped to directly when a TLS negotiation has failed,
1871 or was not done for a host for which it is required. Values will be set
1872 in message and save_errno, and setting_up will always be true. Treat as
1873 a temporary error. */
1880 /* If the failure happened while setting up the call, see if the failure was
1881 a 5xx response (this will either be on connection, or following HELO - a 5xx
1882 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1883 never going to accept them. For other errors during setting up (timeouts or
1884 whatever), defer all addresses, and yield DEFER, so that the host is not
1885 tried again for a while. */
1888 ok = FALSE; /* For when reached by GOTO */
1894 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1898 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1903 /* We want to handle timeouts after MAIL or "." and loss of connection after
1904 "." specially. They can indicate a problem with the sender address or with
1905 the contents of the message rather than a real error on the connection. These
1906 cases are treated in the same way as a 4xx response. This next bit of code
1907 does the classification. */
1918 message_error = TRUE;
1922 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1923 Ustrncmp(smtp_command,"end ",4) == 0;
1926 case ERRNO_SMTPCLOSED:
1927 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1931 message_error = FALSE;
1935 /* Handle the cases that are treated as message errors. These are:
1937 (a) negative response or timeout after MAIL
1938 (b) negative response after DATA
1939 (c) negative response or timeout or dropped connection after "."
1941 It won't be a negative response or timeout after RCPT, as that is dealt
1942 with separately above. The action in all cases is to set an appropriate
1943 error code for all the addresses, but to leave yield set to OK because the
1944 host itself has not failed. Of course, it might in practice have failed
1945 when we've had a timeout, but if so, we'll discover that at the next
1946 delivery attempt. For a temporary error, set the message_defer flag, and
1947 write to the logs for information if this is not the last host. The error
1948 for the last host will be logged as part of the address's log line. */
1952 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1953 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1956 /* If there's an errno, the message contains just the identity of
1959 if (code != '5') /* Anything other than 5 is treated as temporary */
1962 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1963 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1964 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1965 *message_defer = TRUE;
1969 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1970 ".", or some other transportation error. We defer all addresses and yield
1971 DEFER, except for the case of failed add_headers expansion, or a transport
1972 filter failure, when the yield should be ERROR, to stop it trying other
1977 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1978 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1979 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1985 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1986 SMTP session tidily. However, if there were too many addresses to send in one
1987 message (indicated by first_addr being non-NULL) we want to carry on with the
1988 rest of them. Also, it is desirable to send more than one message down the SMTP
1989 connection if there are several waiting, provided we haven't already sent so
1990 many as to hit the configured limit. The function transport_check_waiting looks
1991 for a waiting message and returns its id. Then transport_pass_socket tries to
1992 set up a continued delivery by passing the socket on to another process. The
1993 variable send_rset is FALSE if a message has just been successfully transfered.
1995 If we are already sending down a continued channel, there may be further
1996 addresses not yet delivered that are aimed at the same host, but which have not
1997 been passed in this run of the transport. In this case, continue_more will be
1998 true, and all we should do is send RSET if necessary, and return, leaving the
2001 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2002 do not want to continue with other messages down the same channel, because that
2003 can lead to looping between two or more messages, all with the same,
2004 temporarily failing address(es). [The retry information isn't updated yet, so
2005 new processes keep on trying.] We probably also don't want to try more of this
2006 message's addresses either.
2008 If we have started a TLS session, we have to end it before passing the
2009 connection to a new process. However, not all servers can handle this (Exim
2010 can), so we do not pass such a connection on if the host matches
2011 hosts_nopass_tls. */
2014 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2015 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2016 continue_more, yield, (first_addr == NULL)? "":"not ");
2018 if (completed_address && ok && send_quit)
2021 if (first_addr != NULL || continue_more ||
2023 (tls_out.active < 0 ||
2024 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2025 host->address, NULL) != OK)
2027 transport_check_waiting(tblock->name, host->name,
2028 tblock->connection_max_messages, new_message_id, &more)
2036 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2038 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2039 host->address, strerror(save_errno));
2042 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2043 ob->command_timeout)))
2046 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2050 DEBUG(D_transport) debug_printf("%s\n", msg);
2055 /* Either RSET was not needed, or it succeeded */
2059 if (first_addr != NULL) /* More addresses still to be sent */
2060 { /* in this run of the transport */
2061 continue_sequence++; /* Causes * in logging */
2064 if (continue_more) return yield; /* More addresses for another run */
2066 /* Pass the socket to a new Exim process. Before doing so, we must shut
2067 down TLS. Not all MTAs allow for the continuation of the SMTP session
2068 when TLS is shut down. We test for this by sending a new EHLO. If we
2069 don't get a good response, we don't attempt to pass the socket on. */
2072 if (tls_out.active >= 0)
2074 tls_close(FALSE, TRUE);
2078 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2079 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2080 ob->command_timeout);
2084 /* If the socket is successfully passed, we musn't send QUIT (or
2085 indeed anything!) from here. */
2087 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2088 new_message_id, inblock.sock))
2094 /* If RSET failed and there are addresses left, they get deferred. */
2096 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2100 /* End off tidily with QUIT unless the connection has died or the socket has
2101 been passed to another process. There has been discussion on the net about what
2102 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2103 to wait for a response, but on the other hand, there isn't anything one can do
2104 with an error response, other than log it. Exim used to do that. However,
2105 further discussion suggested that it is positively advantageous not to wait for
2106 the response, but to close the session immediately. This is supposed to move
2107 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2108 load from the server. (Hosts that are both servers and clients may not see much
2109 difference, of course.) Further discussion indicated that this was safe to do
2110 on Unix systems which have decent implementations of TCP/IP that leave the
2111 connection around for a while (TIME_WAIT) after the application has gone away.
2112 This enables the response sent by the server to be properly ACKed rather than
2113 timed out, as can happen on broken TCP/IP implementations on other OS.
2115 This change is being made on 31-Jul-98. After over a year of trouble-free
2116 operation, the old commented-out code was removed on 17-Sep-99. */
2119 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2124 tls_close(FALSE, TRUE);
2127 /* Close the socket, and return the appropriate value, first setting
2128 continue_transport and continue_hostname NULL to prevent any other addresses
2129 that may include the host from trying to re-use a continuation socket. This
2130 works because the NULL setting is passed back to the calling process, and
2131 remote_max_parallel is forced to 1 when delivering over an existing connection,
2133 If all went well and continue_more is set, we shouldn't actually get here if
2134 there are further addresses, as the return above will be taken. However,
2135 writing RSET might have failed, or there may be other addresses whose hosts are
2136 specified in the transports, and therefore not visible at top level, in which
2137 case continue_more won't get set. */
2139 (void)close(inblock.sock);
2140 continue_transport = NULL;
2141 continue_hostname = NULL;
2148 /*************************************************
2149 * Closedown entry point *
2150 *************************************************/
2152 /* This function is called when exim is passed an open smtp channel
2153 from another incarnation, but the message which it has been asked
2154 to deliver no longer exists. The channel is on stdin.
2156 We might do fancy things like looking for another message to send down
2157 the channel, but if the one we sought has gone, it has probably been
2158 delivered by some other process that itself will seek further messages,
2159 so just close down our connection.
2161 Argument: pointer to the transport instance block
2166 smtp_transport_closedown(transport_instance *tblock)
2168 smtp_transport_options_block *ob =
2169 (smtp_transport_options_block *)(tblock->options_block);
2170 smtp_inblock inblock;
2171 smtp_outblock outblock;
2173 uschar inbuffer[4096];
2174 uschar outbuffer[16];
2176 inblock.sock = fileno(stdin);
2177 inblock.buffer = inbuffer;
2178 inblock.buffersize = sizeof(inbuffer);
2179 inblock.ptr = inbuffer;
2180 inblock.ptrend = inbuffer;
2182 outblock.sock = inblock.sock;
2183 outblock.buffersize = sizeof(outbuffer);
2184 outblock.buffer = outbuffer;
2185 outblock.ptr = outbuffer;
2186 outblock.cmd_count = 0;
2187 outblock.authenticating = FALSE;
2189 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2190 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2191 ob->command_timeout);
2192 (void)close(inblock.sock);
2197 /*************************************************
2198 * Prepare addresses for delivery *
2199 *************************************************/
2201 /* This function is called to flush out error settings from previous delivery
2202 attempts to other hosts. It also records whether we got here via an MX record
2203 or not in the more_errno field of the address. We are interested only in
2204 addresses that are still marked DEFER - others may have got delivered to a
2205 previously considered IP address. Set their status to PENDING_DEFER to indicate
2206 which ones are relevant this time.
2209 addrlist the list of addresses
2210 host the host we are delivering to
2212 Returns: the first address for this delivery
2215 static address_item *
2216 prepare_addresses(address_item *addrlist, host_item *host)
2218 address_item *first_addr = NULL;
2220 for (addr = addrlist; addr != NULL; addr = addr->next)
2222 if (addr->transport_return != DEFER) continue;
2223 if (first_addr == NULL) first_addr = addr;
2224 addr->transport_return = PENDING_DEFER;
2225 addr->basic_errno = 0;
2226 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2227 addr->message = NULL;
2229 addr->cipher = NULL;
2230 addr->peerdn = NULL;
2238 /*************************************************
2239 * Main entry point *
2240 *************************************************/
2242 /* See local README for interface details. As this is a remote transport, it is
2243 given a chain of addresses to be delivered in one connection, if possible. It
2244 always returns TRUE, indicating that each address has its own independent
2245 status set, except if there is a setting up problem, in which case it returns
2249 smtp_transport_entry(
2250 transport_instance *tblock, /* data for this instantiation */
2251 address_item *addrlist) /* addresses we are working on */
2255 int hosts_defer = 0;
2257 int hosts_looked_up = 0;
2258 int hosts_retry = 0;
2259 int hosts_serial = 0;
2260 int hosts_total = 0;
2261 int total_hosts_tried = 0;
2263 BOOL expired = TRUE;
2264 BOOL continuing = continue_hostname != NULL;
2265 uschar *expanded_hosts = NULL;
2267 uschar *tid = string_sprintf("%s transport", tblock->name);
2268 smtp_transport_options_block *ob =
2269 (smtp_transport_options_block *)(tblock->options_block);
2270 host_item *hostlist = addrlist->host_list;
2271 host_item *host = NULL;
2275 debug_printf("%s transport entered\n", tblock->name);
2276 for (addr = addrlist; addr != NULL; addr = addr->next)
2277 debug_printf(" %s\n", addr->address);
2278 if (continuing) debug_printf("already connected to %s [%s]\n",
2279 continue_hostname, continue_host_address);
2282 /* Set the flag requesting that these hosts be added to the waiting
2283 database if the delivery fails temporarily or if we are running with
2284 queue_smtp or a 2-stage queue run. This gets unset for certain
2285 kinds of error, typically those that are specific to the message. */
2287 update_waiting = TRUE;
2289 /* If a host list is not defined for the addresses - they must all have the
2290 same one in order to be passed to a single transport - or if the transport has
2291 a host list with hosts_override set, use the host list supplied with the
2292 transport. It is an error for this not to exist. */
2294 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2296 if (ob->hosts == NULL)
2298 addrlist->message = string_sprintf("%s transport called with no hosts set",
2300 addrlist->transport_return = PANIC;
2301 return FALSE; /* Only top address has status */
2304 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2307 /* If the transport's host list contains no '$' characters, and we are not
2308 randomizing, it is fixed and therefore a chain of hosts can be built once
2309 and for all, and remembered for subsequent use by other calls to this
2310 transport. If, on the other hand, the host list does contain '$', or we are
2311 randomizing its order, we have to rebuild it each time. In the fixed case,
2312 as the hosts string will never be used again, it doesn't matter that we
2313 replace all the : characters with zeros. */
2315 if (ob->hostlist == NULL)
2317 uschar *s = ob->hosts;
2319 if (Ustrchr(s, '$') != NULL)
2321 expanded_hosts = expand_string(s);
2322 if (expanded_hosts == NULL)
2324 addrlist->message = string_sprintf("failed to expand list of hosts "
2325 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2326 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2327 return FALSE; /* Only top address has status */
2329 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2330 "\"%s\"\n", s, expanded_hosts);
2334 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2336 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2338 /* Check that the expansion yielded something useful. */
2339 if (hostlist == NULL)
2342 string_sprintf("%s transport has empty hosts setting", tblock->name);
2343 addrlist->transport_return = PANIC;
2344 return FALSE; /* Only top address has status */
2347 /* If there was no expansion of hosts, save the host list for
2350 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2353 /* This is not the first time this transport has been run in this delivery;
2354 the host list was built previously. */
2356 else hostlist = ob->hostlist;
2359 /* The host list was supplied with the address. If hosts_randomize is set, we
2360 must sort it into a random order if it did not come from MX records and has not
2361 already been randomized (but don't bother if continuing down an existing
2364 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2366 host_item *newlist = NULL;
2367 while (hostlist != NULL)
2369 host_item *h = hostlist;
2370 hostlist = hostlist->next;
2372 h->sort_key = random_number(100);
2374 if (newlist == NULL)
2379 else if (h->sort_key < newlist->sort_key)
2386 host_item *hh = newlist;
2387 while (hh->next != NULL)
2389 if (h->sort_key < hh->next->sort_key) break;
2397 hostlist = addrlist->host_list = newlist;
2401 /* Sort out the default port. */
2403 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2406 /* For each host-plus-IP-address on the list:
2408 . If this is a continued delivery and the host isn't the one with the
2409 current connection, skip.
2411 . If the status is unusable (i.e. previously failed or retry checked), skip.
2413 . If no IP address set, get the address, either by turning the name into
2414 an address, calling gethostbyname if gethostbyname is on, or by calling
2415 the DNS. The DNS may yield multiple addresses, in which case insert the
2416 extra ones into the list.
2418 . Get the retry data if not previously obtained for this address and set the
2419 field which remembers the state of this address. Skip if the retry time is
2420 not reached. If not, remember whether retry data was found. The retry string
2421 contains both the name and the IP address.
2423 . Scan the list of addresses and mark those whose status is DEFER as
2424 PENDING_DEFER. These are the only ones that will be processed in this cycle
2427 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2428 Some addresses may be successfully delivered, others may fail, and yet
2429 others may get temporary errors and so get marked DEFER.
2431 . The return from the delivery attempt is OK if a connection was made and a
2432 valid SMTP dialogue was completed. Otherwise it is DEFER.
2434 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2436 . If fail to connect, or other defer state, add a retry item.
2438 . If there are any addresses whose status is still DEFER, carry on to the
2439 next host/IPaddress, unless we have tried the number of hosts given
2440 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2441 there is some fancy logic for hosts_max_try that means its limit can be
2442 overstepped in some circumstances.
2444 If we get to the end of the list, all hosts have deferred at least one address,
2445 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2446 delivery attempt to those hosts whose last try was before the arrival time of
2447 the current message. To cope with this, we have to go round the loop a second
2448 time. After that, set the status and error data for any addresses that haven't
2449 had it set already. */
2451 for (cutoff_retry = 0; expired &&
2452 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2455 host_item *nexthost = NULL;
2456 int unexpired_hosts_tried = 0;
2458 for (host = hostlist;
2460 unexpired_hosts_tried < ob->hosts_max_try &&
2461 total_hosts_tried < ob->hosts_max_try_hardlimit;
2467 BOOL serialized = FALSE;
2468 BOOL host_is_expired = FALSE;
2469 BOOL message_defer = FALSE;
2470 BOOL ifchanges = FALSE;
2471 BOOL some_deferred = FALSE;
2472 address_item *first_addr = NULL;
2473 uschar *interface = NULL;
2474 uschar *retry_host_key = NULL;
2475 uschar *retry_message_key = NULL;
2476 uschar *serialize_key = NULL;
2478 /* Default next host is next host. :-) But this can vary if the
2479 hosts_max_try limit is hit (see below). It may also be reset if a host
2480 address is looked up here (in case the host was multihomed). */
2482 nexthost = host->next;
2484 /* If the address hasn't yet been obtained from the host name, look it up
2485 now, unless the host is already marked as unusable. If it is marked as
2486 unusable, it means that the router was unable to find its IP address (in
2487 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2488 the lookup failed last time. We don't get this far if *all* MX records
2489 point to non-existent hosts; that is treated as a hard error.
2491 We can just skip this host entirely. When the hosts came from the router,
2492 the address will timeout based on the other host(s); when the address is
2493 looked up below, there is an explicit retry record added.
2495 Note that we mustn't skip unusable hosts if the address is not unset; they
2496 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2498 if (host->address == NULL)
2500 int new_port, flags;
2502 uschar *canonical_name;
2504 if (host->status >= hstatus_unusable)
2506 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2511 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2513 /* The host name is permitted to have an attached port. Find it, and
2514 strip it from the name. Just remember it for now. */
2516 new_port = host_item_get_port(host);
2518 /* Count hosts looked up */
2522 /* Find by name if so configured, or if it's an IP address. We don't
2523 just copy the IP address, because we need the test-for-local to happen. */
2525 flags = HOST_FIND_BY_A;
2526 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2527 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2529 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2530 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2532 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2533 &canonical_name, NULL);
2535 /* Update the host (and any additional blocks, resulting from
2536 multihoming) with a host-specific port, if any. */
2538 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2540 /* Failure to find the host at this time (usually DNS temporary failure)
2541 is really a kind of routing failure rather than a transport failure.
2542 Therefore we add a retry item of the routing kind, not to stop us trying
2543 to look this name up here again, but to ensure the address gets timed
2544 out if the failures go on long enough. A complete failure at this point
2545 commonly points to a configuration error, but the best action is still
2546 to carry on for the next host. */
2548 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2550 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2552 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2553 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2554 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2555 host->status = hstatus_unusable;
2557 for (addr = addrlist; addr != NULL; addr = addr->next)
2559 if (addr->transport_return != DEFER) continue;
2560 addr->basic_errno = ERRNO_UNKNOWNHOST;
2562 string_sprintf("failed to lookup IP address for %s", host->name);
2567 /* If the host is actually the local host, we may have a problem, or
2568 there may be some cunning configuration going on. In the problem case,
2569 log things and give up. The default transport status is already DEFER. */
2571 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2573 for (addr = addrlist; addr != NULL; addr = addr->next)
2575 addr->basic_errno = 0;
2576 addr->message = string_sprintf("%s transport found host %s to be "
2577 "local", tblock->name, host->name);
2581 } /* End of block for IP address lookup */
2583 /* If this is a continued delivery, we are interested only in the host
2584 which matches the name of the existing open channel. The check is put
2585 here after the local host lookup, in case the name gets expanded as a
2586 result of the lookup. Set expired FALSE, to save the outer loop executing
2589 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2590 Ustrcmp(continue_host_address, host->address) != 0))
2593 continue; /* With next host */
2596 /* Reset the default next host in case a multihomed host whose addresses
2597 are not looked up till just above added to the host list. */
2599 nexthost = host->next;
2601 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2602 domain is in queue_smtp_domains, we don't actually want to attempt any
2603 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2604 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2605 were not in it. We don't want to hold up all SMTP deliveries! Except when
2606 doing a two-stage queue run, don't do this if forcing. */
2608 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2609 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2610 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2613 for (addr = addrlist; addr != NULL; addr = addr->next)
2615 if (addr->transport_return != DEFER) continue;
2616 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2618 continue; /* With next host */
2621 /* Count hosts being considered - purely for an intelligent comment
2622 if none are usable. */
2626 /* Set $host and $host address now in case they are needed for the
2627 interface expansion or the serialize_hosts check; they remain set if an
2628 actual delivery happens. */
2630 deliver_host = host->name;
2631 deliver_host_address = host->address;
2633 /* Set up a string for adding to the retry key if the port number is not
2634 the standard SMTP port. A host may have its own port setting that overrides
2637 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2639 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2641 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2642 string changes upon expansion, we must add it to the key that is used for
2643 retries, because connections to the same host from a different interface
2644 should be treated separately. */
2646 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2647 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2650 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2652 /* The first time round the outer loop, check the status of the host by
2653 inspecting the retry data. The second time round, we are interested only
2654 in expired hosts that haven't been tried since this message arrived. */
2656 if (cutoff_retry == 0)
2658 /* Ensure the status of the address is set by checking retry data if
2659 necessary. There maybe host-specific retry data (applicable to all
2660 messages) and also data for retries of a specific message at this host.
2661 If either of these retry records are actually read, the keys used are
2662 returned to save recomputing them later. */
2664 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2665 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2667 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2668 (host->address == NULL)? US"" : host->address, pistring,
2669 (host->status == hstatus_usable)? "usable" :
2670 (host->status == hstatus_unusable)? "unusable" :
2671 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2673 /* Skip this address if not usable at this time, noting if it wasn't
2674 actually expired, both locally and in the address. */
2676 switch (host->status)
2678 case hstatus_unusable:
2680 setflag(addrlist, af_retry_skipped);
2683 case hstatus_unusable_expired:
2686 case hwhy_retry: hosts_retry++; break;
2687 case hwhy_failed: hosts_fail++; break;
2688 case hwhy_deferred: hosts_defer++; break;
2691 /* If there was a retry message key, implying that previously there
2692 was a message-specific defer, we don't want to update the list of
2693 messages waiting for these hosts. */
2695 if (retry_message_key != NULL) update_waiting = FALSE;
2696 continue; /* With the next host or IP address */
2700 /* Second time round the loop: if the address is set but expired, and
2701 the message is newer than the last try, let it through. */
2705 if (host->address == NULL ||
2706 host->status != hstatus_unusable_expired ||
2707 host->last_try > received_time)
2710 debug_printf("trying expired host %s [%s]%s\n",
2711 host->name, host->address, pistring);
2712 host_is_expired = TRUE;
2715 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2716 it remains TRUE only if all hosts are expired and none are actually tried.
2721 /* If this host is listed as one to which access must be serialized,
2722 see if another Exim process has a connection to it, and if so, skip
2723 this host. If not, update the database to record our connection to it
2724 and remember this for later deletion. Do not do any of this if we are
2725 sending the message down a pre-existing connection. */
2728 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2729 host->address, NULL) == OK)
2731 serialize_key = string_sprintf("host-serialize-%s", host->name);
2732 if (!enq_start(serialize_key))
2735 debug_printf("skipping host %s because another Exim process "
2736 "is connected to it\n", host->name);
2743 /* OK, we have an IP address that is not waiting for its retry time to
2744 arrive (it might be expired) OR (second time round the loop) we have an
2745 expired host that hasn't been tried since the message arrived. Have a go
2746 at delivering the message to it. First prepare the addresses by flushing
2747 out the result of previous attempts, and finding the first address that
2748 is still to be delivered. */
2750 first_addr = prepare_addresses(addrlist, host);
2752 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2753 message_id, host->name, host->address, addrlist->address,
2754 (addrlist->next == NULL)? "" : ", ...");
2756 set_process_info("delivering %s to %s [%s] (%s%s)",
2757 message_id, host->name, host->address, addrlist->address,
2758 (addrlist->next == NULL)? "" : ", ...");
2760 /* This is not for real; don't do the delivery. If there are
2761 any remaining hosts, list them. */
2766 set_errno(addrlist, 0, NULL, OK, FALSE);
2767 for (addr = addrlist; addr != NULL; addr = addr->next)
2769 addr->host_used = host;
2770 addr->special_action = '*';
2771 addr->message = US"delivery bypassed by -N option";
2775 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2776 "*** host and remaining hosts:\n", tblock->name);
2777 for (host2 = host; host2 != NULL; host2 = host2->next)
2778 debug_printf(" %s [%s]\n", host2->name,
2779 (host2->address == NULL)? US"unset" : host2->address);
2784 /* This is for real. If the host is expired, we don't count it for
2785 hosts_max_retry. This ensures that all hosts must expire before an address
2786 is timed out, unless hosts_max_try_hardlimit (which protects against
2787 lunatic DNS configurations) is reached.
2789 If the host is not expired and we are about to hit the hosts_max_retry
2790 limit, check to see if there is a subsequent hosts with a different MX
2791 value. If so, make that the next host, and don't count this one. This is a
2792 heuristic to make sure that different MXs do get tried. With a normal kind
2793 of retry rule, they would get tried anyway when the earlier hosts were
2794 delayed, but if the domain has a "retry every time" type of rule - as is
2795 often used for the the very large ISPs, that won't happen. */
2799 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2803 debug_printf("hosts_max_try limit reached with this host\n");
2804 for (h = host; h != NULL; h = h->next)
2805 if (h->mx != host->mx) break;
2809 unexpired_hosts_tried--;
2810 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2811 "and will be tried\n");
2815 /* Attempt the delivery. */
2817 total_hosts_tried++;
2818 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2819 expanded_hosts != NULL, &message_defer, FALSE);
2822 OK => connection made, each address contains its result;
2823 message_defer is set for message-specific defers (when all
2824 recipients are marked defer)
2825 DEFER => there was a non-message-specific delivery problem;
2826 ERROR => there was a problem setting up the arguments for a filter,
2827 or there was a problem with expanding added headers
2830 /* If the result is not OK, there was a non-message-specific problem.
2831 If the result is DEFER, we need to write to the logs saying what happened
2832 for this particular host, except in the case of authentication and TLS
2833 failures, where the log has already been written. If all hosts defer a
2834 general message is written at the end. */
2836 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2837 first_addr->basic_errno != ERRNO_TLSFAILURE)
2838 write_logs(first_addr, host);
2840 /* If STARTTLS was accepted, but there was a failure in setting up the
2841 TLS session (usually a certificate screwup), and the host is not in
2842 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2843 TLS forcibly turned off. We have to start from scratch with a new SMTP
2844 connection. That's why the retry is done from here, not from within
2845 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2846 session, so the in-clear transmission after those errors, if permitted,
2847 happens inside smtp_deliver().] */
2850 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2851 ob->tls_tempfail_tryclear &&
2852 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2853 host->address, NULL) != OK)
2855 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2856 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2857 first_addr = prepare_addresses(addrlist, host);
2858 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2859 expanded_hosts != NULL, &message_defer, TRUE);
2860 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2861 write_logs(first_addr, host);
2866 /* Delivery attempt finished */
2868 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2871 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2872 message_id, host->name, host->address, addrlist->address,
2873 (addrlist->next == NULL)? "" : " (& others)", rs);
2875 /* Release serialization if set up */
2877 if (serialized) enq_end(serialize_key);
2879 /* If the result is DEFER, or if a host retry record is known to exist, we
2880 need to add an item to the retry chain for updating the retry database
2881 at the end of delivery. We only need to add the item to the top address,
2882 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2883 for any other delivery attempts using the same address. (It is copied into
2884 the unusable tree at the outer level, so even if different address blocks
2885 contain the same address, it still won't get tried again.) */
2887 if (rc == DEFER || retry_host_key != NULL)
2889 int delete_flag = (rc != DEFER)? rf_delete : 0;
2890 if (retry_host_key == NULL)
2892 retry_host_key = ob->retry_include_ip_address?
2893 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2894 string_sprintf("T:%S%s", host->name, pistring);
2897 /* If a delivery of another message over an existing SMTP connection
2898 yields DEFER, we do NOT set up retry data for the host. This covers the
2899 case when there are delays in routing the addresses in the second message
2900 that are so long that the server times out. This is alleviated by not
2901 routing addresses that previously had routing defers when handling an
2902 existing connection, but even so, this case may occur (e.g. if a
2903 previously happily routed address starts giving routing defers). If the
2904 host is genuinely down, another non-continued message delivery will
2905 notice it soon enough. */
2907 if (delete_flag != 0 || !continuing)
2908 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2910 /* We may have tried an expired host, if its retry time has come; ensure
2911 the status reflects the expiry for the benefit of any other addresses. */
2915 host->status = (host_is_expired)?
2916 hstatus_unusable_expired : hstatus_unusable;
2917 host->why = hwhy_deferred;
2921 /* If message_defer is set (host was OK, but every recipient got deferred
2922 because of some message-specific problem), or if that had happened
2923 previously so that a message retry key exists, add an appropriate item
2924 to the retry chain. Note that if there was a message defer but now there is
2925 a host defer, the message defer record gets deleted. That seems perfectly
2926 reasonable. Also, stop the message from being remembered as waiting
2927 for specific hosts. */
2929 if (message_defer || retry_message_key != NULL)
2931 int delete_flag = message_defer? 0 : rf_delete;
2932 if (retry_message_key == NULL)
2934 retry_message_key = ob->retry_include_ip_address?
2935 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2937 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2939 retry_add_item(addrlist, retry_message_key,
2940 rf_message | rf_host | delete_flag);
2941 update_waiting = FALSE;
2944 /* Any return other than DEFER (that is, OK or ERROR) means that the
2945 addresses have got their final statuses filled in for this host. In the OK
2946 case, see if any of them are deferred. */
2950 for (addr = addrlist; addr != NULL; addr = addr->next)
2952 if (addr->transport_return == DEFER)
2954 some_deferred = TRUE;
2960 /* If no addresses deferred or the result was ERROR, return. We do this for
2961 ERROR because a failing filter set-up or add_headers expansion is likely to
2962 fail for any host we try. */
2964 if (rc == ERROR || (rc == OK && !some_deferred))
2966 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2967 return TRUE; /* Each address has its status */
2970 /* If the result was DEFER or some individual addresses deferred, let
2971 the loop run to try other hosts with the deferred addresses, except for the
2972 case when we were trying to deliver down an existing channel and failed.
2973 Don't try any other hosts in this case. */
2975 if (continuing) break;
2977 /* If the whole delivery, or some individual addresses, were deferred and
2978 there are more hosts that could be tried, do not count this host towards
2979 the hosts_max_try limit if the age of the message is greater than the
2980 maximum retry time for this host. This means we may try try all hosts,
2981 ignoring the limit, when messages have been around for some time. This is
2982 important because if we don't try all hosts, the address will never time
2983 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2985 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2988 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2990 if (retry != NULL && retry->rules != NULL)
2992 retry_rule *last_rule;
2993 for (last_rule = retry->rules;
2994 last_rule->next != NULL;
2995 last_rule = last_rule->next);
2996 timedout = time(NULL) - received_time > last_rule->timeout;
2998 else timedout = TRUE; /* No rule => timed out */
3002 unexpired_hosts_tried--;
3003 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3004 "hosts_max_try (message older than host's retry time)\n");
3007 } /* End of loop for trying multiple hosts. */
3009 /* This is the end of the loop that repeats iff expired is TRUE and
3010 ob->delay_after_cutoff is FALSE. The second time round we will
3011 try those hosts that haven't been tried since the message arrived. */
3015 debug_printf("all IP addresses skipped or deferred at least one address\n");
3016 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3017 debug_printf("retrying IP addresses not tried since message arrived\n");
3022 /* Get here if all IP addresses are skipped or defer at least one address. In
3023 MUA wrapper mode, this will happen only for connection or other non-message-
3024 specific failures. Force the delivery status for all addresses to FAIL. */
3028 for (addr = addrlist; addr != NULL; addr = addr->next)
3029 addr->transport_return = FAIL;
3033 /* In the normal, non-wrapper case, add a standard message to each deferred
3034 address if there hasn't been an error, that is, if it hasn't actually been
3035 tried this time. The variable "expired" will be FALSE if any deliveries were
3036 actually tried, or if there was at least one host that was not expired. That
3037 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3038 a delivery has been tried, an error code will be set, and the failing of the
3039 message is handled by the retry code later.
3041 If queue_smtp is set, or this transport was called to send a subsequent message
3042 down an existing TCP/IP connection, and something caused the host not to be
3043 found, we end up here, but can detect these cases and handle them specially. */
3045 for (addr = addrlist; addr != NULL; addr = addr->next)
3047 /* If host is not NULL, it means that we stopped processing the host list
3048 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3049 means we need to behave as if some hosts were skipped because their retry
3050 time had not come. Specifically, this prevents the address from timing out.
3051 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3052 hosts were tried. */
3056 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3059 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3060 "hosts were tried\n");
3065 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3066 setflag(addr, af_retry_skipped);
3070 if (queue_smtp) /* no deliveries attempted */
3072 addr->transport_return = DEFER;
3073 addr->basic_errno = 0;
3074 addr->message = US"SMTP delivery explicitly queued";
3077 else if (addr->transport_return == DEFER &&
3078 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3079 addr->message == NULL)
3081 addr->basic_errno = ERRNO_HRETRY;
3082 if (continue_hostname != NULL)
3084 addr->message = US"no host found for existing SMTP connection";
3088 setflag(addr, af_pass_message); /* This is not a security risk */
3089 addr->message = (ob->delay_after_cutoff)?
3090 US"retry time not reached for any host after a long failure period" :
3091 US"all hosts have been failing for a long time and were last tried "
3092 "after this message arrived";
3094 /* If we are already using fallback hosts, or there are no fallback hosts
3095 defined, convert the result to FAIL to cause a bounce. */
3097 if (addr->host_list == addr->fallback_hosts ||
3098 addr->fallback_hosts == NULL)
3099 addr->transport_return = FAIL;
3103 if (hosts_retry == hosts_total)
3104 addr->message = US"retry time not reached for any host";
3105 else if (hosts_fail == hosts_total)
3106 addr->message = US"all host address lookups failed permanently";
3107 else if (hosts_defer == hosts_total)
3108 addr->message = US"all host address lookups failed temporarily";
3109 else if (hosts_serial == hosts_total)
3110 addr->message = US"connection limit reached for all hosts";
3111 else if (hosts_fail+hosts_defer == hosts_total)
3112 addr->message = US"all host address lookups failed";
3113 else addr->message = US"some host address lookups failed and retry time "
3114 "not reached for other hosts or connection limit reached";
3119 /* Update the database which keeps information about which messages are waiting
3120 for which hosts to become available. For some message-specific errors, the
3121 update_waiting flag is turned off because we don't want follow-on deliveries in
3122 those cases. If this transport instance is explicitly limited to one message
3123 per connection then follow-on deliveries are not possible and there's no need
3124 to create/update the per-transport wait-<transport_name> database. */
3126 if (update_waiting && tblock->connection_max_messages != 1)
3127 transport_update_waiting(hostlist, tblock->name);
3131 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3133 return TRUE; /* Each address has its status */
3136 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob