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) },
109 { "interface", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, interface) },
111 { "keepalive", opt_bool,
112 (void *)offsetof(smtp_transport_options_block, keepalive) },
113 { "lmtp_ignore_quota", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
115 { "max_rcpt", opt_int | opt_public,
116 (void *)offsetof(transport_instance, max_addresses) },
117 { "multi_domain", opt_bool | opt_public,
118 (void *)offsetof(transport_instance, multi_domain) },
119 { "port", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, port) },
121 { "protocol", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, protocol) },
123 { "retry_include_ip_address", opt_bool,
124 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
125 { "serialize_hosts", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
127 { "size_addition", opt_int,
128 (void *)offsetof(smtp_transport_options_block, size_addition) }
130 ,{ "tls_certificate", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
132 { "tls_crl", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, tls_crl) },
134 { "tls_dh_min_bits", opt_int,
135 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
136 { "tls_privatekey", opt_stringptr,
137 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
138 { "tls_require_ciphers", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
140 { "tls_sni", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, tls_sni) },
142 { "tls_tempfail_tryclear", opt_bool,
143 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
144 { "tls_verify_certificates", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
149 /* Size of the options list. An extern variable has to be used so that its
150 address can appear in the tables drtables.c. */
152 int smtp_transport_options_count =
153 sizeof(smtp_transport_options)/sizeof(optionlist);
155 /* Default private options block for the smtp transport. */
157 smtp_transport_options_block smtp_transport_option_defaults = {
159 NULL, /* fallback_hosts */
161 NULL, /* fallback_hostlist */
162 NULL, /* authenticated_sender */
163 US"$primary_hostname", /* helo_data */
164 NULL, /* interface */
166 US"smtp", /* protocol */
168 NULL, /* serialize_hosts */
169 NULL, /* hosts_try_auth */
170 NULL, /* hosts_require_auth */
171 NULL, /* hosts_require_tls */
172 NULL, /* hosts_avoid_tls */
173 NULL, /* hosts_avoid_pipelining */
174 NULL, /* hosts_avoid_esmtp */
175 NULL, /* hosts_nopass_tls */
176 5*60, /* command_timeout */
177 5*60, /* connect_timeout; shorter system default overrides */
178 5*60, /* data timeout */
179 10*60, /* final timeout */
180 1024, /* size_addition */
181 5, /* hosts_max_try */
182 50, /* hosts_max_try_hardlimit */
183 TRUE, /* address_retry_include_sender */
184 FALSE, /* allow_localhost */
185 FALSE, /* authenticated_sender_force */
186 FALSE, /* gethostbyname */
187 TRUE, /* dns_qualify_single */
188 FALSE, /* dns_search_parents */
189 TRUE, /* delay_after_cutoff */
190 FALSE, /* hosts_override */
191 FALSE, /* hosts_randomize */
192 TRUE, /* keepalive */
193 FALSE, /* lmtp_ignore_quota */
194 TRUE /* retry_include_ip_address */
196 ,NULL, /* tls_certificate */
198 NULL, /* tls_privatekey */
199 NULL, /* tls_require_ciphers */
200 NULL, /* gnutls_require_kx */
201 NULL, /* gnutls_require_mac */
202 NULL, /* gnutls_require_proto */
204 NULL, /* tls_verify_certificates */
205 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
206 /* tls_dh_min_bits */
207 TRUE /* tls_tempfail_tryclear */
210 ,NULL, /* dkim_canon */
211 NULL, /* dkim_domain */
212 NULL, /* dkim_private_key */
213 NULL, /* dkim_selector */
214 NULL, /* dkim_sign_headers */
215 NULL /* dkim_strict */
222 static uschar *smtp_command; /* Points to last cmd for error messages */
223 static uschar *mail_command; /* Points to MAIL cmd for error messages */
224 static BOOL update_waiting; /* TRUE to update the "wait" database */
227 /*************************************************
228 * Setup entry point *
229 *************************************************/
231 /* This function is called when the transport is about to be used,
232 but before running it in a sub-process. It is used for two things:
234 (1) To set the fallback host list in addresses, when delivering.
235 (2) To pass back the interface, port, protocol, and other options, for use
236 during callout verification.
239 tblock pointer to the transport instance block
240 addrlist list of addresses about to be transported
241 tf if not NULL, pointer to block in which to return options
242 uid the uid that will be set (not used)
243 gid the gid that will be set (not used)
244 errmsg place for error message (not used)
246 Returns: OK always (FAIL, DEFER not used)
250 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
251 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
253 smtp_transport_options_block *ob =
254 (smtp_transport_options_block *)(tblock->options_block);
256 errmsg = errmsg; /* Keep picky compilers happy */
260 /* Pass back options if required. This interface is getting very messy. */
264 tf->interface = ob->interface;
266 tf->protocol = ob->protocol;
267 tf->hosts = ob->hosts;
268 tf->hosts_override = ob->hosts_override;
269 tf->hosts_randomize = ob->hosts_randomize;
270 tf->gethostbyname = ob->gethostbyname;
271 tf->qualify_single = ob->dns_qualify_single;
272 tf->search_parents = ob->dns_search_parents;
273 tf->helo_data = ob->helo_data;
276 /* Set the fallback host list for all the addresses that don't have fallback
277 host lists, provided that the local host wasn't present in the original host
280 if (!testflag(addrlist, af_local_host_removed))
282 for (; addrlist != NULL; addrlist = addrlist->next)
283 if (addrlist->fallback_hosts == NULL)
284 addrlist->fallback_hosts = ob->fallback_hostlist;
292 /*************************************************
293 * Initialization entry point *
294 *************************************************/
296 /* Called for each instance, after its options have been read, to
297 enable consistency checks to be done, or anything else that needs
300 Argument: pointer to the transport instance block
305 smtp_transport_init(transport_instance *tblock)
307 smtp_transport_options_block *ob =
308 (smtp_transport_options_block *)(tblock->options_block);
310 /* Retry_use_local_part defaults FALSE if unset */
312 if (tblock->retry_use_local_part == TRUE_UNSET)
313 tblock->retry_use_local_part = FALSE;
315 /* Set the default port according to the protocol */
317 if (ob->port == NULL)
318 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
319 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
321 /* Set up the setup entry point, to be called before subprocesses for this
324 tblock->setup = smtp_transport_setup;
326 /* Complain if any of the timeouts are zero. */
328 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
329 ob->final_timeout <= 0)
330 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
331 "command, data, or final timeout value is zero for %s transport",
334 /* If hosts_override is set and there are local hosts, set the global
335 flag that stops verify from showing router hosts. */
337 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
339 /* If there are any fallback hosts listed, build a chain of host items
340 for them, but do not do any lookups at this time. */
342 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
349 /*************************************************
350 * Set delivery info into all active addresses *
351 *************************************************/
353 /* Only addresses whose status is >= PENDING are relevant. A lesser
354 status means that an address is not currently being processed.
357 addrlist points to a chain of addresses
358 errno_value to put in each address's errno field
359 msg to put in each address's message field
360 rc to put in each address's transport_return field
361 pass_message if TRUE, set the "pass message" flag in the address
363 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
364 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
365 this particular type of timeout.
371 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
376 if (errno_value == ERRNO_CONNECTTIMEOUT)
378 errno_value = ETIMEDOUT;
379 orvalue = RTEF_CTOUT;
381 for (addr = addrlist; addr != NULL; addr = addr->next)
383 if (addr->transport_return < PENDING) continue;
384 addr->basic_errno = errno_value;
385 addr->more_errno |= orvalue;
389 if (pass_message) setflag(addr, af_pass_message);
391 addr->transport_return = rc;
397 /*************************************************
398 * Check an SMTP response *
399 *************************************************/
401 /* This function is given an errno code and the SMTP response buffer
402 to analyse, together with the host identification for generating messages. It
403 sets an appropriate message and puts the first digit of the response code into
404 the yield variable. If no response was actually read, a suitable digit is
408 host the current host, to get its name for messages
409 errno_value pointer to the errno value
410 more_errno from the top address for use with ERRNO_FILTER_FAIL
411 buffer the SMTP response buffer
412 yield where to put a one-digit SMTP response code
413 message where to put an errror message
414 pass_message set TRUE if message is an SMTP response
416 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
419 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
420 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
424 if (smtp_use_pipelining &&
425 (Ustrcmp(smtp_command, "MAIL") == 0 ||
426 Ustrcmp(smtp_command, "RCPT") == 0 ||
427 Ustrcmp(smtp_command, "DATA") == 0))
430 *yield = '4'; /* Default setting is to give a temporary error */
432 /* Handle response timeout */
434 if (*errno_value == ETIMEDOUT)
436 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
437 "after %s%s", host->name, host->address, pl, smtp_command);
438 if (transport_count > 0)
439 *message = US string_sprintf("%s (%d bytes written)", *message,
444 /* Handle malformed SMTP response */
446 if (*errno_value == ERRNO_SMTPFORMAT)
448 uschar *malfresp = string_printing(buffer);
449 while (isspace(*malfresp)) malfresp++;
451 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
452 "%s [%s] in response to %s%s", host->name, host->address, pl,
455 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
456 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
460 /* Handle a failed filter process error; can't send QUIT as we mustn't
463 if (*errno_value == ERRNO_FILTER_FAIL)
465 *message = US string_sprintf("transport filter process failed (%d)%s",
467 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
471 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
474 if (*errno_value == ERRNO_CHHEADER_FAIL)
477 US string_sprintf("failed to expand headers_add or headers_remove: %s",
478 expand_string_message);
482 /* Handle failure to write a complete data block */
484 if (*errno_value == ERRNO_WRITEINCOMPLETE)
486 *message = US string_sprintf("failed to write a data block");
490 /* Handle error responses from the remote mailer. */
494 uschar *s = string_printing(buffer);
495 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
496 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
497 *pass_message = TRUE;
502 /* No data was read. If there is no errno, this must be the EOF (i.e.
503 connection closed) case, which causes deferral. An explicit connection reset
504 error has the same effect. Otherwise, put the host's identity in the message,
505 leaving the errno value to be interpreted as well. In all cases, we have to
506 assume the connection is now dead. */
508 if (*errno_value == 0 || *errno_value == ECONNRESET)
510 *errno_value = ERRNO_SMTPCLOSED;
511 *message = US string_sprintf("Remote host %s [%s] closed connection "
512 "in response to %s%s", host->name, host->address, pl, smtp_command);
514 else *message = US string_sprintf("%s [%s]", host->name, host->address);
521 /*************************************************
522 * Write error message to logs *
523 *************************************************/
525 /* This writes to the main log and to the message log.
528 addr the address item containing error information
529 host the current host
535 write_logs(address_item *addr, host_item *host)
537 if (addr->message != NULL)
539 uschar *message = addr->message;
540 if (addr->basic_errno > 0)
541 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
542 log_write(0, LOG_MAIN, "%s", message);
543 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
548 ((log_extra_selector & LX_outgoing_port) != 0)?
549 string_sprintf("%s [%s]:%d", host->name, host->address,
550 (host->port == PORT_NONE)? 25 : host->port)
552 string_sprintf("%s [%s]", host->name, host->address);
553 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
554 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
555 strerror(addr->basic_errno));
561 /*************************************************
562 * Synchronize SMTP responses *
563 *************************************************/
565 /* This function is called from smtp_deliver() to receive SMTP responses from
566 the server, and match them up with the commands to which they relate. When
567 PIPELINING is not in use, this function is called after every command, and is
568 therefore somewhat over-engineered, but it is simpler to use a single scheme
569 that works both with and without PIPELINING instead of having two separate sets
572 The set of commands that are buffered up with pipelining may start with MAIL
573 and may end with DATA; in between are RCPT commands that correspond to the
574 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
575 etc.) are never buffered.
577 Errors after MAIL or DATA abort the whole process leaving the response in the
578 buffer. After MAIL, pending responses are flushed, and the original command is
579 re-instated in big_buffer for error messages. For RCPT commands, the remote is
580 permitted to reject some recipient addresses while accepting others. However
581 certain errors clearly abort the whole process. Set the value in
582 transport_return to PENDING_OK if the address is accepted. If there is a
583 subsequent general error, it will get reset accordingly. If not, it will get
584 converted to OK at the end.
587 addrlist the complete address list
588 include_affixes TRUE if affixes include in RCPT
589 sync_addr ptr to the ptr of the one to start scanning at (updated)
590 host the host we are connected to
591 count the number of responses to read
593 include_sender true if 4xx retry is to include the sender it its key
594 pending_MAIL true if the first response is for MAIL
595 pending_DATA 0 if last command sent was not DATA
596 +1 if previously had a good recipient
597 -1 if not previously had a good recipient
598 inblock incoming SMTP block
599 timeout timeout value
600 buffer buffer for reading response
601 buffsize size of buffer
603 Returns: 3 if at least one address had 2xx and one had 5xx
604 2 if at least one address had 5xx but none had 2xx
605 1 if at least one host had a 2xx response, but none had 5xx
606 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
607 -1 timeout while reading RCPT response
608 -2 I/O or other non-response error for RCPT
609 -3 DATA or MAIL failed - errno and buffer set
613 sync_responses(address_item *addrlist, BOOL include_affixes,
614 address_item **sync_addr, host_item *host, int count,
615 BOOL address_retry_include_sender, BOOL pending_MAIL,
616 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
619 address_item *addr = *sync_addr;
622 /* Handle the response for a MAIL command. On error, reinstate the original
623 command in big_buffer for error message use, and flush any further pending
624 responses before returning, except after I/O errors and timeouts. */
629 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
631 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
632 if (errno == 0 && buffer[0] != 0)
634 uschar flushbuffer[4096];
636 if (buffer[0] == '4')
638 save_errno = ERRNO_MAIL4XX;
639 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
643 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
645 && (errno != 0 || flushbuffer[0] == 0))
654 if (pending_DATA) count--; /* Number of RCPT responses to come */
656 /* Read and handle the required number of RCPT responses, matching each one up
657 with an address by scanning for the next address whose status is PENDING_DEFER.
662 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
664 /* The address was accepted */
666 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
669 addr->transport_return = PENDING_OK;
671 /* If af_dr_retry_exists is set, there was a routing delay on this address;
672 ensure that any address-specific retry record is expunged. We do this both
673 for the basic key and for the version that also includes the sender. */
675 if (testflag(addr, af_dr_retry_exists))
677 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
679 retry_add_item(addr, altkey, rf_delete);
680 retry_add_item(addr, addr->address_retry_key, rf_delete);
684 /* Timeout while reading the response */
686 else if (errno == ETIMEDOUT)
688 int save_errno = errno;
689 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
690 "after RCPT TO:<%s>", host->name, host->address,
691 transport_rcpt_address(addr, include_affixes));
692 set_errno(addrlist, save_errno, message, DEFER, FALSE);
693 retry_add_item(addr, addr->address_retry_key, 0);
694 update_waiting = FALSE;
698 /* Handle other errors in obtaining an SMTP response by returning -1. This
699 will cause all the addresses to be deferred. Restore the SMTP command in
700 big_buffer for which we are checking the response, so the error message
703 else if (errno != 0 || buffer[0] == 0)
705 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
706 transport_rcpt_address(addr, include_affixes));
710 /* Handle SMTP permanent and temporary response codes. */
715 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
716 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
717 host->name, host->address, string_printing(buffer));
718 setflag(addr, af_pass_message);
719 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
721 /* The response was 5xx */
723 if (buffer[0] == '5')
725 addr->transport_return = FAIL;
729 /* The response was 4xx */
733 addr->transport_return = DEFER;
734 addr->basic_errno = ERRNO_RCPT4XX;
735 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
737 /* Log temporary errors if there are more hosts to be tried. */
739 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
741 /* Do not put this message on the list of those waiting for specific
742 hosts, as otherwise it is likely to be tried too often. */
744 update_waiting = FALSE;
746 /* Add a retry item for the address so that it doesn't get tried again
747 too soon. If address_retry_include_sender is true, add the sender address
750 if (address_retry_include_sender)
752 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
754 retry_add_item(addr, altkey, 0);
756 else retry_add_item(addr, addr->address_retry_key, 0);
759 } /* Loop for next RCPT response */
761 /* Update where to start at for the next block of responses, unless we
762 have already handled all the addresses. */
764 if (addr != NULL) *sync_addr = addr->next;
766 /* Handle a response to DATA. If we have not had any good recipients, either
767 previously or in this block, the response is ignored. */
769 if (pending_DATA != 0 &&
770 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
775 if (pending_DATA > 0 || (yield & 1) != 0)
777 if (errno == 0 && buffer[0] == '4')
779 errno = ERRNO_DATA4XX;
780 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
784 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
785 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
786 "is in use and there were no good recipients\n", msg);
789 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
790 present) received 3xx. If any RCPTs were handled and yielded anything other
791 than 4xx, yield will be set non-zero. */
798 /*************************************************
799 * Deliver address list to given host *
800 *************************************************/
802 /* If continue_hostname is not null, we get here only when continuing to
803 deliver down an existing channel. The channel was passed as the standard
804 input. TLS is never active on a passed channel; the previous process always
805 closes it down before passing the connection on.
807 Otherwise, we have to make a connection to the remote host, and do the
808 initial protocol exchange.
810 When running as an MUA wrapper, if the sender or any recipient is rejected,
811 temporarily or permanently, we force failure for all recipients.
814 addrlist chain of potential addresses to deliver; only those whose
815 transport_return field is set to PENDING_DEFER are currently
816 being processed; others should be skipped - they have either
817 been delivered to an earlier host or IP address, or been
818 failed by one of them.
819 host host to deliver to
820 host_af AF_INET or AF_INET6
821 port default TCP/IP port to use, in host byte order
822 interface interface to bind to, or NULL
823 tblock transport instance block
824 copy_host TRUE if host set in addr->host_used must be copied, because
825 it is specific to this call of the transport
826 message_defer set TRUE if yield is OK, but all addresses were deferred
827 because of a non-recipient, non-host failure, that is, a
828 4xx response to MAIL FROM, DATA, or ".". This is a defer
829 that is specific to the message.
830 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
831 a second attempt after TLS initialization fails
833 Returns: OK - the connection was made and the delivery attempted;
834 the result for each address is in its data block.
835 DEFER - the connection could not be made, or something failed
836 while setting up the SMTP session, or there was a
837 non-message-specific error, such as a timeout.
838 ERROR - a filter command is specified for this transport,
839 and there was a problem setting it up; OR helo_data
840 or add_headers or authenticated_sender is specified
841 for this transport, and the string failed to expand
845 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
846 uschar *interface, transport_instance *tblock, BOOL copy_host,
847 BOOL *message_defer, BOOL suppress_tls)
850 address_item *sync_addr;
851 address_item *first_addr = addrlist;
856 time_t start_delivery_time = time(NULL);
857 smtp_transport_options_block *ob =
858 (smtp_transport_options_block *)(tblock->options_block);
859 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
860 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
862 BOOL send_rset = TRUE;
863 BOOL send_quit = TRUE;
864 BOOL setting_up = TRUE;
865 BOOL completed_address = FALSE;
868 BOOL pass_message = FALSE;
869 smtp_inblock inblock;
870 smtp_outblock outblock;
871 int max_rcpt = tblock->max_addresses;
872 uschar *igquotstr = US"";
873 uschar *local_authenticated_sender = authenticated_sender;
874 uschar *helo_data = NULL;
875 uschar *message = NULL;
876 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
879 uschar inbuffer[4096];
880 uschar outbuffer[1024];
882 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
884 *message_defer = FALSE;
885 smtp_command = US"initial connection";
886 if (max_rcpt == 0) max_rcpt = 999999;
888 /* Set up the buffer for reading SMTP response packets. */
890 inblock.buffer = inbuffer;
891 inblock.buffersize = sizeof(inbuffer);
892 inblock.ptr = inbuffer;
893 inblock.ptrend = inbuffer;
895 /* Set up the buffer for holding SMTP commands while pipelining */
897 outblock.buffer = outbuffer;
898 outblock.buffersize = sizeof(outbuffer);
899 outblock.ptr = outbuffer;
900 outblock.cmd_count = 0;
901 outblock.authenticating = FALSE;
903 /* Reset the parameters of a TLS session. */
906 tls_in.cipher = NULL; /* for back-compatible behaviour */
907 tls_in.peerdn = NULL;
908 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
913 tls_out.cipher = NULL; /* the one we may use for this transport */
914 tls_out.peerdn = NULL;
915 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
919 /* If an authenticated_sender override has been specified for this transport
920 instance, expand it. If the expansion is forced to fail, and there was already
921 an authenticated_sender for this message, the original value will be used.
922 Other expansion failures are serious. An empty result is ignored, but there is
923 otherwise no check - this feature is expected to be used with LMTP and other
924 cases where non-standard addresses (e.g. without domains) might be required. */
926 if (ob->authenticated_sender != NULL)
928 uschar *new = expand_string(ob->authenticated_sender);
931 if (!expand_string_forcedfail)
933 uschar *message = string_sprintf("failed to expand "
934 "authenticated_sender: %s", expand_string_message);
935 set_errno(addrlist, 0, message, DEFER, FALSE);
939 else if (new[0] != 0) local_authenticated_sender = new;
945 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
950 /* Make a connection to the host if this isn't a continued delivery, and handle
951 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
952 specially so they can be identified for retries. */
954 if (continue_hostname == NULL)
956 inblock.sock = outblock.sock =
957 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
958 ob->keepalive, ob->dscp); /* This puts port into host->port */
960 if (inblock.sock < 0)
962 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
967 /* Expand the greeting message while waiting for the initial response. (Makes
968 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
969 delayed till here so that $sending_interface and $sending_port are set. */
971 helo_data = expand_string(ob->helo_data);
973 /* The first thing is to wait for an initial OK response. The dreaded "goto"
974 is nevertheless a reasonably clean way of programming this kind of logic,
975 where you want to escape on any error. */
979 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
980 ob->command_timeout)) goto RESPONSE_FAILED;
982 /* Now check if the helo_data expansion went well, and sign off cleanly if
985 if (helo_data == NULL)
987 uschar *message = string_sprintf("failed to expand helo_data: %s",
988 expand_string_message);
989 set_errno(addrlist, 0, message, DEFER, FALSE);
995 /** Debugging without sending a message
996 addrlist->transport_return = DEFER;
1000 /* Errors that occur after this point follow an SMTP command, which is
1001 left in big_buffer by smtp_write_command() for use in error messages. */
1003 smtp_command = big_buffer;
1005 /* Tell the remote who we are...
1007 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1008 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1009 greeting is of this form. The assumption was that the far end supports it
1010 properly... but experience shows that there are some that give 5xx responses,
1011 even though the banner includes "ESMTP" (there's a bloody-minded one that
1012 says "ESMTP not spoken here"). Cope with that case.
1014 September 2000: Time has passed, and it seems reasonable now to always send
1015 EHLO at the start. It is also convenient to make the change while installing
1018 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1019 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1020 would be no way to send out the mails, so there is now a host list
1021 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1022 PIPELINING problem as well. Maybe it can also be useful to cure other
1023 problems with broken servers.
1025 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1026 Then somebody tried it with a Microsoft mailer... It seems that all other
1027 mailers use upper case for some reason (the RFC is quite clear about case
1028 independence) so, for peace of mind, I gave in. */
1030 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1031 host->name, host->address, NULL) != OK;
1033 /* Alas; be careful, since this goto is not an error-out, so conceivably
1034 we might set data between here and the target which we assume to exist
1035 and be usable. I can see this coming back to bite us. */
1040 suppress_tls = FALSE;
1041 ob->tls_tempfail_tryclear = FALSE;
1042 smtp_command = US"SSL-on-connect";
1049 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1050 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1052 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1053 ob->command_timeout))
1055 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1062 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1067 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1069 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1070 ob->command_timeout)) goto RESPONSE_FAILED;
1073 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1074 lmtp_ignore_quota option was set. */
1076 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1077 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1078 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1080 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1083 tls_offered = esmtp &&
1084 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1085 PCRE_EOPT, NULL, 0) >= 0;
1089 /* For continuing deliveries down the same channel, the socket is the standard
1090 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1091 below). Set up the pointer to where subsequent commands will be left, for
1092 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1093 set from the command line if they were set in the process that passed the
1098 inblock.sock = outblock.sock = fileno(stdin);
1099 smtp_command = big_buffer;
1100 host->port = port; /* Record the port that was used */
1103 /* If TLS is available on this connection, whether continued or not, attempt to
1104 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1105 send another EHLO - the server may give a different answer in secure mode. We
1106 use a separate buffer for reading the response to STARTTLS so that if it is
1107 negative, the original EHLO data is available for subsequent analysis, should
1108 the client not be required to use TLS. If the response is bad, copy the buffer
1109 for error analysis. */
1112 if (tls_offered && !suppress_tls &&
1113 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1114 host->address, NULL) != OK)
1116 uschar buffer2[4096];
1117 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1120 /* If there is an I/O error, transmission of this message is deferred. If
1121 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1122 false, we also defer. However, if there is a temporary rejection of STARTTLS
1123 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1124 STARTTLS, we carry on. This means we will try to send the message in clear,
1125 unless the host is in hosts_require_tls (tested below). */
1127 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1128 ob->command_timeout))
1130 if (errno != 0 || buffer2[0] == 0 ||
1131 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1133 Ustrncpy(buffer, buffer2, sizeof(buffer));
1134 goto RESPONSE_FAILED;
1138 /* STARTTLS accepted: try to negotiate a TLS session. */
1143 int rc = tls_client_start(inblock.sock,
1146 NULL, /* No DH param */
1147 ob->tls_certificate,
1150 ob->tls_verify_certificates,
1152 ob->tls_require_ciphers,
1153 ob->tls_dh_min_bits,
1154 ob->command_timeout);
1156 /* TLS negotiation failed; give an error. From outside, this function may
1157 be called again to try in clear on a new connection, if the options permit
1158 it for this host. */
1162 save_errno = ERRNO_TLSFAILURE;
1163 message = US"failure while setting up TLS session";
1168 /* TLS session is set up */
1170 for (addr = addrlist; addr != NULL; addr = addr->next)
1172 if (addr->transport_return == PENDING_DEFER)
1174 addr->cipher = tls_out.cipher;
1175 addr->peerdn = tls_out.peerdn;
1181 /* if smtps, we'll have smtp_command set to something else; always safe to
1183 smtp_command = big_buffer;
1185 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1186 helo_data is null, we are dealing with a connection that was passed from
1187 another process, and so we won't have expanded helo_data above. We have to
1188 expand it here. $sending_ip_address and $sending_port are set up right at the
1189 start of the Exim process (in exim.c). */
1191 if (tls_out.active >= 0)
1194 if (helo_data == NULL)
1196 helo_data = expand_string(ob->helo_data);
1197 if (helo_data == NULL)
1199 uschar *message = string_sprintf("failed to expand helo_data: %s",
1200 expand_string_message);
1201 set_errno(addrlist, 0, message, DEFER, FALSE);
1207 /* For SMTPS we need to wait for the initial OK response. */
1210 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1211 ob->command_timeout)) goto RESPONSE_FAILED;
1215 greeting_cmd = "EHLO";
1218 greeting_cmd = "HELO";
1220 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1223 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1224 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1226 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1227 ob->command_timeout))
1228 goto RESPONSE_FAILED;
1231 /* If the host is required to use a secure channel, ensure that we
1234 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1235 host->address, NULL) == OK)
1237 save_errno = ERRNO_TLSREQUIRED;
1238 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1239 host->name, host->address,
1240 tls_offered? "an attempt to start TLS failed" :
1241 "the server did not offer TLS support");
1246 /* If TLS is active, we have just started it up and re-done the EHLO command,
1247 so its response needs to be analyzed. If TLS is not active and this is a
1248 continued session down a previously-used socket, we haven't just done EHLO, so
1251 if (continue_hostname == NULL
1253 || tls_out.active >= 0
1258 uschar *fail_reason = US"server did not advertise AUTH support";
1260 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1261 lmtp_ignore_quota option was set. */
1263 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1264 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1265 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1267 /* If the response to EHLO specified support for the SIZE parameter, note
1268 this, provided size_addition is non-negative. */
1270 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1271 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1272 PCRE_EOPT, NULL, 0) >= 0;
1274 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1275 the current host, esmtp will be false, so PIPELINING can never be used. If
1276 the current host matches hosts_avoid_pipelining, don't do it. */
1278 smtp_use_pipelining = esmtp &&
1279 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1280 host->address, NULL) != OK &&
1281 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1282 PCRE_EOPT, NULL, 0) >= 0;
1284 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1285 smtp_use_pipelining? "" : "not ");
1287 /* Note if the response to EHLO specifies support for the AUTH extension.
1288 If it has, check that this host is one we want to authenticate to, and do
1289 the business. The host name and address must be available when the
1290 authenticator's client driver is running. */
1292 smtp_authenticated = FALSE;
1293 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1294 host->name, host->address, NULL);
1296 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1298 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1299 expand_nmax = -1; /* reset */
1301 /* Must not do this check until after we have saved the result of the
1302 regex match above. */
1304 if (require_auth == OK ||
1305 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1306 host->address, NULL) == OK)
1309 fail_reason = US"no common mechanisms were found";
1311 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1313 /* Scan the configured authenticators looking for one which is configured
1314 for use as a client, which is not suppressed by client_condition, and
1315 whose name matches an authentication mechanism supported by the server.
1316 If one is found, attempt to authenticate by calling its client function.
1319 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1323 (au->client_condition != NULL &&
1324 !expand_check_condition(au->client_condition, au->name,
1325 US"client authenticator")))
1327 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1329 (au->client)? "client_condition is false" :
1330 "not configured as a client");
1334 /* Loop to scan supported server mechanisms */
1339 int len = Ustrlen(au->public_name);
1340 while (isspace(*p)) p++;
1342 if (strncmpic(au->public_name, p, len) != 0 ||
1343 (p[len] != 0 && !isspace(p[len])))
1345 while (*p != 0 && !isspace(*p)) p++;
1349 /* Found data for a listed mechanism. Call its client entry. Set
1350 a flag in the outblock so that data is overwritten after sending so
1351 that reflections don't show it. */
1353 fail_reason = US"authentication attempt(s) failed";
1354 outblock.authenticating = TRUE;
1355 rc = (au->info->clientcode)(au, &inblock, &outblock,
1356 ob->command_timeout, buffer, sizeof(buffer));
1357 outblock.authenticating = FALSE;
1358 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1361 /* A temporary authentication failure must hold up delivery to
1362 this host. After a permanent authentication failure, we carry on
1363 to try other authentication methods. If all fail hard, try to
1364 deliver the message unauthenticated unless require_auth was set. */
1369 smtp_authenticated = TRUE; /* stops the outer loop */
1372 /* Failure after writing a command */
1377 /* Failure after reading a response */
1380 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1381 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1382 au->name, host->name, host->address, buffer);
1385 /* Failure by some other means. In effect, the authenticator
1386 decided it wasn't prepared to handle this case. Typically this
1387 is the result of "fail" in an expansion string. Do we need to
1388 log anything here? Feb 2006: a message is now put in the buffer
1389 if logging is required. */
1393 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1394 "authentication H=%s [%s] %s", au->name, host->name,
1395 host->address, buffer);
1398 /* Internal problem, message in buffer. */
1402 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1406 break; /* If not authenticated, try next authenticator */
1407 } /* Loop for scanning supported server mechanisms */
1408 } /* Loop for further authenticators */
1412 /* If we haven't authenticated, but are required to, give up. */
1414 if (require_auth == OK && !smtp_authenticated)
1417 set_errno(addrlist, ERRNO_AUTHFAIL,
1418 string_sprintf("authentication required but %s", fail_reason), DEFER,
1424 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1425 message-specific. */
1429 /* If there is a filter command specified for this transport, we can now
1430 set it up. This cannot be done until the identify of the host is known. */
1432 if (tblock->filter_command != NULL)
1436 sprintf(CS buffer, "%.50s transport", tblock->name);
1437 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1438 TRUE, DEFER, addrlist, buffer, NULL);
1439 transport_filter_timeout = tblock->filter_timeout;
1441 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1446 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1454 /* For messages that have more than the maximum number of envelope recipients,
1455 we want to send several transactions down the same SMTP connection. (See
1456 comments in deliver.c as to how this reconciles, heuristically, with
1457 remote_max_parallel.) This optimization was added to Exim after the following
1458 code was already working. The simplest way to put it in without disturbing the
1459 code was to use a goto to jump back to this point when there is another
1460 transaction to handle. */
1463 sync_addr = first_addr;
1467 completed_address = FALSE;
1470 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1471 qualification, send it, adding something to the message size to allow for
1472 imprecision and things that get added en route. Exim keeps the number of lines
1473 in a message, so we can give an accurate value for the original message, but we
1474 need some additional to handle added headers. (Double "." characters don't get
1475 included in the count.) */
1482 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1486 /* Add the authenticated sender address if present */
1488 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1489 local_authenticated_sender != NULL)
1491 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1492 auth_xtextencode(local_authenticated_sender,
1493 Ustrlen(local_authenticated_sender)));
1496 /* From here until we send the DATA command, we can make use of PIPELINING
1497 if the server host supports it. The code has to be able to check the responses
1498 at any point, for when the buffer fills up, so we write it totally generally.
1499 When PIPELINING is off, each command written reports that it has flushed the
1502 pending_MAIL = TRUE; /* The block starts with MAIL */
1504 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1505 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1506 mail_command = string_copy(big_buffer); /* Save for later error message */
1510 case -1: /* Transmission error */
1513 case +1: /* Block was sent */
1514 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1515 ob->command_timeout))
1517 if (errno == 0 && buffer[0] == '4')
1519 errno = ERRNO_MAIL4XX;
1520 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1522 goto RESPONSE_FAILED;
1524 pending_MAIL = FALSE;
1528 /* Pass over all the relevant recipient addresses for this host, which are the
1529 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1530 several before we have to read the responses for those seen so far. This
1531 checking is done by a subroutine because it also needs to be done at the end.
1532 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1533 the next one if not all are sent.
1535 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1536 last address because we want to abort if any recipients have any kind of
1537 problem, temporary or permanent. We know that all recipient addresses will have
1538 the PENDING_DEFER status, because only one attempt is ever made, and we know
1539 that max_rcpt will be large, so all addresses will be done at once. */
1541 for (addr = first_addr;
1542 address_count < max_rcpt && addr != NULL;
1548 if (addr->transport_return != PENDING_DEFER) continue;
1551 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1553 /* Now send the RCPT command, and process outstanding responses when
1554 necessary. After a timeout on RCPT, we just end the function, leaving the
1555 yield as OK, because this error can often mean that there is a problem with
1556 just one address, so we don't want to delay the host. */
1558 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1559 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1560 if (count < 0) goto SEND_FAILED;
1563 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1564 &sync_addr, host, count, ob->address_retry_include_sender,
1565 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1568 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1569 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1572 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1573 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1574 case 0: /* No 2xx or 5xx, but no probs */
1577 case -1: goto END_OFF; /* Timeout on RCPT */
1578 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1580 pending_MAIL = FALSE; /* Dealt with MAIL */
1582 } /* Loop for next address */
1584 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1585 permanently or temporarily. We should have flushed and synced after the last
1590 address_item *badaddr;
1591 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1593 if (badaddr->transport_return != PENDING_OK) break;
1595 if (badaddr != NULL)
1597 set_errno(addrlist, 0, badaddr->message, FAIL,
1598 testflag(badaddr, af_pass_message));
1603 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1604 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1605 have a good recipient buffered up if we are pipelining. We don't want to waste
1606 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1607 are pipelining. The responses are all handled by sync_responses(). */
1609 if (ok || (smtp_use_pipelining && !mua_wrapper))
1611 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1612 if (count < 0) goto SEND_FAILED;
1613 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1614 host, count, ob->address_retry_include_sender, pending_MAIL,
1615 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1617 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1618 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1621 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1622 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1623 case 0: break; /* No 2xx or 5xx, but no probs */
1625 case -1: goto END_OFF; /* Timeout on RCPT */
1626 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1630 /* Save the first address of the next batch. */
1634 /* If there were no good recipients (but otherwise there have been no
1635 problems), just set ok TRUE, since we have handled address-specific errors
1636 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1637 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1638 well as body. Set the appropriate timeout value to be used for each chunk.
1639 (Haven't been able to make it work using select() for writing yet.) */
1641 if (!ok) ok = TRUE; else
1643 sigalrm_seen = FALSE;
1644 transport_write_timeout = ob->data_timeout;
1645 smtp_command = US"sending data block"; /* For error messages */
1646 DEBUG(D_transport|D_v)
1647 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1648 transport_count = 0;
1649 #ifndef DISABLE_DKIM
1650 ok = dkim_transport_write_message(addrlist, inblock.sock,
1651 topt_use_crlf | topt_end_dot | topt_escape_headers |
1652 (tblock->body_only? topt_no_headers : 0) |
1653 (tblock->headers_only? topt_no_body : 0) |
1654 (tblock->return_path_add? topt_add_return_path : 0) |
1655 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1656 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1657 0, /* No size limit */
1658 tblock->add_headers, tblock->remove_headers,
1659 US".", US"..", /* Escaping strings */
1660 tblock->rewrite_rules, tblock->rewrite_existflags,
1661 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1662 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1665 ok = transport_write_message(addrlist, inblock.sock,
1666 topt_use_crlf | topt_end_dot | topt_escape_headers |
1667 (tblock->body_only? topt_no_headers : 0) |
1668 (tblock->headers_only? topt_no_body : 0) |
1669 (tblock->return_path_add? topt_add_return_path : 0) |
1670 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1671 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1672 0, /* No size limit */
1673 tblock->add_headers, tblock->remove_headers,
1674 US".", US"..", /* Escaping strings */
1675 tblock->rewrite_rules, tblock->rewrite_existflags);
1678 /* transport_write_message() uses write() because it is called from other
1679 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1680 it can exit with "Broken pipe" as its error. This really means that the
1681 socket got closed at the far end. */
1683 transport_write_timeout = 0; /* for subsequent transports */
1685 /* Failure can either be some kind of I/O disaster (including timeout),
1686 or the failure of a transport filter or the expansion of added headers. */
1690 buffer[0] = 0; /* There hasn't been a response */
1691 goto RESPONSE_FAILED;
1694 /* We used to send the terminating "." explicitly here, but because of
1695 buffering effects at both ends of TCP/IP connections, you don't gain
1696 anything by keeping it separate, so it might as well go in the final
1697 data buffer for efficiency. This is now done by setting the topt_end_dot
1700 smtp_command = US"end of data";
1702 /* For SMTP, we now read a single response that applies to the whole message.
1703 If it is OK, then all the addresses have been delivered. */
1707 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1709 if (!ok && errno == 0 && buffer[0] == '4')
1711 errno = ERRNO_DATA4XX;
1712 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1716 /* For LMTP, we get back a response for every RCPT command that we sent;
1717 some may be accepted and some rejected. For those that get a response, their
1718 status is fixed; any that are accepted have been handed over, even if later
1719 responses crash - at least, that's how I read RFC 2033.
1721 If all went well, mark the recipient addresses as completed, record which
1722 host/IPaddress they were delivered to, and cut out RSET when sending another
1723 message down the same channel. Write the completed addresses to the journal
1724 now so that they are recorded in case there is a crash of hardware or
1725 software before the spool gets updated. Also record the final SMTP
1726 confirmation if needed (for SMTP only). */
1731 int delivery_time = (int)(time(NULL) - start_delivery_time);
1734 uschar *conf = NULL;
1737 /* Make a copy of the host if it is local to this invocation
1738 of the transport. */
1742 thost = store_get(sizeof(host_item));
1744 thost->name = string_copy(host->name);
1745 thost->address = string_copy(host->address);
1749 /* Set up confirmation if needed - applies only to SMTP */
1751 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1753 uschar *s = string_printing(buffer);
1754 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1757 /* Process all transported addresses - for LMTP, read a status for
1760 for (addr = addrlist; addr != first_addr; addr = addr->next)
1762 if (addr->transport_return != PENDING_OK) continue;
1764 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1765 remaining addresses. Otherwise, it's a return code for just the one
1766 address. For temporary errors, add a retry item for the address so that
1767 it doesn't get tried again too soon. */
1771 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1774 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1775 addr->message = string_sprintf("LMTP error after %s: %s",
1776 big_buffer, string_printing(buffer));
1777 setflag(addr, af_pass_message); /* Allow message to go to user */
1778 if (buffer[0] == '5')
1779 addr->transport_return = FAIL;
1782 errno = ERRNO_DATA4XX;
1783 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1784 addr->transport_return = DEFER;
1785 retry_add_item(addr, addr->address_retry_key, 0);
1789 completed_address = TRUE; /* NOW we can set this flag */
1790 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1792 uschar *s = string_printing(buffer);
1793 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1797 /* SMTP, or success return from LMTP for this address. Pass back the
1798 actual host that was used. */
1800 addr->transport_return = OK;
1801 addr->more_errno = delivery_time;
1802 addr->host_used = thost;
1803 addr->special_action = flag;
1804 addr->message = conf;
1807 /* Update the journal. For homonymic addresses, use the base address plus
1808 the transport name. See lots of comments in deliver.c about the reasons
1809 for the complications when homonyms are involved. Just carry on after
1810 write error, as it may prove possible to update the spool file later. */
1812 if (testflag(addr, af_homonym))
1813 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1815 sprintf(CS buffer, "%.500s\n", addr->unique);
1817 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1818 len = Ustrlen(CS buffer);
1819 if (write(journal_fd, buffer, len) != len)
1820 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1821 "%s: %s", buffer, strerror(errno));
1824 /* Ensure the journal file is pushed out to disk. */
1826 if (EXIMfsync(journal_fd) < 0)
1827 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1833 /* Handle general (not specific to one address) failures here. The value of ok
1834 is used to skip over this code on the falling through case. A timeout causes a
1835 deferral. Other errors may defer or fail according to the response code, and
1836 may set up a special errno value, e.g. after connection chopped, which is
1837 assumed if errno == 0 and there is no text in the buffer. If control reaches
1838 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1839 the problem is not related to this specific message. */
1848 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1849 buffer, &code, &message, &pass_message);
1855 message = US string_sprintf("send() to %s [%s] failed: %s",
1856 host->name, host->address, strerror(save_errno));
1860 /* This label is jumped to directly when a TLS negotiation has failed,
1861 or was not done for a host for which it is required. Values will be set
1862 in message and save_errno, and setting_up will always be true. Treat as
1863 a temporary error. */
1870 /* If the failure happened while setting up the call, see if the failure was
1871 a 5xx response (this will either be on connection, or following HELO - a 5xx
1872 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1873 never going to accept them. For other errors during setting up (timeouts or
1874 whatever), defer all addresses, and yield DEFER, so that the host is not
1875 tried again for a while. */
1878 ok = FALSE; /* For when reached by GOTO */
1884 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1888 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1893 /* We want to handle timeouts after MAIL or "." and loss of connection after
1894 "." specially. They can indicate a problem with the sender address or with
1895 the contents of the message rather than a real error on the connection. These
1896 cases are treated in the same way as a 4xx response. This next bit of code
1897 does the classification. */
1908 message_error = TRUE;
1912 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1913 Ustrncmp(smtp_command,"end ",4) == 0;
1916 case ERRNO_SMTPCLOSED:
1917 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1921 message_error = FALSE;
1925 /* Handle the cases that are treated as message errors. These are:
1927 (a) negative response or timeout after MAIL
1928 (b) negative response after DATA
1929 (c) negative response or timeout or dropped connection after "."
1931 It won't be a negative response or timeout after RCPT, as that is dealt
1932 with separately above. The action in all cases is to set an appropriate
1933 error code for all the addresses, but to leave yield set to OK because the
1934 host itself has not failed. Of course, it might in practice have failed
1935 when we've had a timeout, but if so, we'll discover that at the next
1936 delivery attempt. For a temporary error, set the message_defer flag, and
1937 write to the logs for information if this is not the last host. The error
1938 for the last host will be logged as part of the address's log line. */
1942 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1943 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1946 /* If there's an errno, the message contains just the identity of
1949 if (code != '5') /* Anything other than 5 is treated as temporary */
1952 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1953 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1954 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1955 *message_defer = TRUE;
1959 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1960 ".", or some other transportation error. We defer all addresses and yield
1961 DEFER, except for the case of failed add_headers expansion, or a transport
1962 filter failure, when the yield should be ERROR, to stop it trying other
1967 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1968 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1969 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1975 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1976 SMTP session tidily. However, if there were too many addresses to send in one
1977 message (indicated by first_addr being non-NULL) we want to carry on with the
1978 rest of them. Also, it is desirable to send more than one message down the SMTP
1979 connection if there are several waiting, provided we haven't already sent so
1980 many as to hit the configured limit. The function transport_check_waiting looks
1981 for a waiting message and returns its id. Then transport_pass_socket tries to
1982 set up a continued delivery by passing the socket on to another process. The
1983 variable send_rset is FALSE if a message has just been successfully transfered.
1985 If we are already sending down a continued channel, there may be further
1986 addresses not yet delivered that are aimed at the same host, but which have not
1987 been passed in this run of the transport. In this case, continue_more will be
1988 true, and all we should do is send RSET if necessary, and return, leaving the
1991 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1992 do not want to continue with other messages down the same channel, because that
1993 can lead to looping between two or more messages, all with the same,
1994 temporarily failing address(es). [The retry information isn't updated yet, so
1995 new processes keep on trying.] We probably also don't want to try more of this
1996 message's addresses either.
1998 If we have started a TLS session, we have to end it before passing the
1999 connection to a new process. However, not all servers can handle this (Exim
2000 can), so we do not pass such a connection on if the host matches
2001 hosts_nopass_tls. */
2004 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2005 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2006 continue_more, yield, (first_addr == NULL)? "":"not ");
2008 if (completed_address && ok && send_quit)
2011 if (first_addr != NULL || continue_more ||
2013 (tls_out.active < 0 ||
2014 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2015 host->address, NULL) != OK)
2017 transport_check_waiting(tblock->name, host->name,
2018 tblock->connection_max_messages, new_message_id, &more)
2026 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2028 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2029 host->address, strerror(save_errno));
2032 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2033 ob->command_timeout)))
2036 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2040 DEBUG(D_transport) debug_printf("%s\n", msg);
2045 /* Either RSET was not needed, or it succeeded */
2049 if (first_addr != NULL) /* More addresses still to be sent */
2050 { /* in this run of the transport */
2051 continue_sequence++; /* Causes * in logging */
2054 if (continue_more) return yield; /* More addresses for another run */
2056 /* Pass the socket to a new Exim process. Before doing so, we must shut
2057 down TLS. Not all MTAs allow for the continuation of the SMTP session
2058 when TLS is shut down. We test for this by sending a new EHLO. If we
2059 don't get a good response, we don't attempt to pass the socket on. */
2062 if (tls_out.active >= 0)
2064 tls_close(FALSE, TRUE);
2068 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2069 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2070 ob->command_timeout);
2074 /* If the socket is successfully passed, we musn't send QUIT (or
2075 indeed anything!) from here. */
2077 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2078 new_message_id, inblock.sock))
2084 /* If RSET failed and there are addresses left, they get deferred. */
2086 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2090 /* End off tidily with QUIT unless the connection has died or the socket has
2091 been passed to another process. There has been discussion on the net about what
2092 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2093 to wait for a response, but on the other hand, there isn't anything one can do
2094 with an error response, other than log it. Exim used to do that. However,
2095 further discussion suggested that it is positively advantageous not to wait for
2096 the response, but to close the session immediately. This is supposed to move
2097 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2098 load from the server. (Hosts that are both servers and clients may not see much
2099 difference, of course.) Further discussion indicated that this was safe to do
2100 on Unix systems which have decent implementations of TCP/IP that leave the
2101 connection around for a while (TIME_WAIT) after the application has gone away.
2102 This enables the response sent by the server to be properly ACKed rather than
2103 timed out, as can happen on broken TCP/IP implementations on other OS.
2105 This change is being made on 31-Jul-98. After over a year of trouble-free
2106 operation, the old commented-out code was removed on 17-Sep-99. */
2109 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2114 tls_close(FALSE, TRUE);
2117 /* Close the socket, and return the appropriate value, first setting
2118 continue_transport and continue_hostname NULL to prevent any other addresses
2119 that may include the host from trying to re-use a continuation socket. This
2120 works because the NULL setting is passed back to the calling process, and
2121 remote_max_parallel is forced to 1 when delivering over an existing connection,
2123 If all went well and continue_more is set, we shouldn't actually get here if
2124 there are further addresses, as the return above will be taken. However,
2125 writing RSET might have failed, or there may be other addresses whose hosts are
2126 specified in the transports, and therefore not visible at top level, in which
2127 case continue_more won't get set. */
2129 (void)close(inblock.sock);
2130 continue_transport = NULL;
2131 continue_hostname = NULL;
2138 /*************************************************
2139 * Closedown entry point *
2140 *************************************************/
2142 /* This function is called when exim is passed an open smtp channel
2143 from another incarnation, but the message which it has been asked
2144 to deliver no longer exists. The channel is on stdin.
2146 We might do fancy things like looking for another message to send down
2147 the channel, but if the one we sought has gone, it has probably been
2148 delivered by some other process that itself will seek further messages,
2149 so just close down our connection.
2151 Argument: pointer to the transport instance block
2156 smtp_transport_closedown(transport_instance *tblock)
2158 smtp_transport_options_block *ob =
2159 (smtp_transport_options_block *)(tblock->options_block);
2160 smtp_inblock inblock;
2161 smtp_outblock outblock;
2163 uschar inbuffer[4096];
2164 uschar outbuffer[16];
2166 inblock.sock = fileno(stdin);
2167 inblock.buffer = inbuffer;
2168 inblock.buffersize = sizeof(inbuffer);
2169 inblock.ptr = inbuffer;
2170 inblock.ptrend = inbuffer;
2172 outblock.sock = inblock.sock;
2173 outblock.buffersize = sizeof(outbuffer);
2174 outblock.buffer = outbuffer;
2175 outblock.ptr = outbuffer;
2176 outblock.cmd_count = 0;
2177 outblock.authenticating = FALSE;
2179 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2180 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2181 ob->command_timeout);
2182 (void)close(inblock.sock);
2187 /*************************************************
2188 * Prepare addresses for delivery *
2189 *************************************************/
2191 /* This function is called to flush out error settings from previous delivery
2192 attempts to other hosts. It also records whether we got here via an MX record
2193 or not in the more_errno field of the address. We are interested only in
2194 addresses that are still marked DEFER - others may have got delivered to a
2195 previously considered IP address. Set their status to PENDING_DEFER to indicate
2196 which ones are relevant this time.
2199 addrlist the list of addresses
2200 host the host we are delivering to
2202 Returns: the first address for this delivery
2205 static address_item *
2206 prepare_addresses(address_item *addrlist, host_item *host)
2208 address_item *first_addr = NULL;
2210 for (addr = addrlist; addr != NULL; addr = addr->next)
2212 if (addr->transport_return != DEFER) continue;
2213 if (first_addr == NULL) first_addr = addr;
2214 addr->transport_return = PENDING_DEFER;
2215 addr->basic_errno = 0;
2216 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2217 addr->message = NULL;
2219 addr->cipher = NULL;
2220 addr->peerdn = NULL;
2228 /*************************************************
2229 * Main entry point *
2230 *************************************************/
2232 /* See local README for interface details. As this is a remote transport, it is
2233 given a chain of addresses to be delivered in one connection, if possible. It
2234 always returns TRUE, indicating that each address has its own independent
2235 status set, except if there is a setting up problem, in which case it returns
2239 smtp_transport_entry(
2240 transport_instance *tblock, /* data for this instantiation */
2241 address_item *addrlist) /* addresses we are working on */
2245 int hosts_defer = 0;
2247 int hosts_looked_up = 0;
2248 int hosts_retry = 0;
2249 int hosts_serial = 0;
2250 int hosts_total = 0;
2251 int total_hosts_tried = 0;
2253 BOOL expired = TRUE;
2254 BOOL continuing = continue_hostname != NULL;
2255 uschar *expanded_hosts = NULL;
2257 uschar *tid = string_sprintf("%s transport", tblock->name);
2258 smtp_transport_options_block *ob =
2259 (smtp_transport_options_block *)(tblock->options_block);
2260 host_item *hostlist = addrlist->host_list;
2261 host_item *host = NULL;
2265 debug_printf("%s transport entered\n", tblock->name);
2266 for (addr = addrlist; addr != NULL; addr = addr->next)
2267 debug_printf(" %s\n", addr->address);
2268 if (continuing) debug_printf("already connected to %s [%s]\n",
2269 continue_hostname, continue_host_address);
2272 /* Set the flag requesting that these hosts be added to the waiting
2273 database if the delivery fails temporarily or if we are running with
2274 queue_smtp or a 2-stage queue run. This gets unset for certain
2275 kinds of error, typically those that are specific to the message. */
2277 update_waiting = TRUE;
2279 /* If a host list is not defined for the addresses - they must all have the
2280 same one in order to be passed to a single transport - or if the transport has
2281 a host list with hosts_override set, use the host list supplied with the
2282 transport. It is an error for this not to exist. */
2284 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2286 if (ob->hosts == NULL)
2288 addrlist->message = string_sprintf("%s transport called with no hosts set",
2290 addrlist->transport_return = PANIC;
2291 return FALSE; /* Only top address has status */
2294 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2297 /* If the transport's host list contains no '$' characters, and we are not
2298 randomizing, it is fixed and therefore a chain of hosts can be built once
2299 and for all, and remembered for subsequent use by other calls to this
2300 transport. If, on the other hand, the host list does contain '$', or we are
2301 randomizing its order, we have to rebuild it each time. In the fixed case,
2302 as the hosts string will never be used again, it doesn't matter that we
2303 replace all the : characters with zeros. */
2305 if (ob->hostlist == NULL)
2307 uschar *s = ob->hosts;
2309 if (Ustrchr(s, '$') != NULL)
2311 expanded_hosts = expand_string(s);
2312 if (expanded_hosts == NULL)
2314 addrlist->message = string_sprintf("failed to expand list of hosts "
2315 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2316 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2317 return FALSE; /* Only top address has status */
2319 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2320 "\"%s\"\n", s, expanded_hosts);
2324 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2326 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2328 /* Check that the expansion yielded something useful. */
2329 if (hostlist == NULL)
2332 string_sprintf("%s transport has empty hosts setting", tblock->name);
2333 addrlist->transport_return = PANIC;
2334 return FALSE; /* Only top address has status */
2337 /* If there was no expansion of hosts, save the host list for
2340 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2343 /* This is not the first time this transport has been run in this delivery;
2344 the host list was built previously. */
2346 else hostlist = ob->hostlist;
2349 /* The host list was supplied with the address. If hosts_randomize is set, we
2350 must sort it into a random order if it did not come from MX records and has not
2351 already been randomized (but don't bother if continuing down an existing
2354 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2356 host_item *newlist = NULL;
2357 while (hostlist != NULL)
2359 host_item *h = hostlist;
2360 hostlist = hostlist->next;
2362 h->sort_key = random_number(100);
2364 if (newlist == NULL)
2369 else if (h->sort_key < newlist->sort_key)
2376 host_item *hh = newlist;
2377 while (hh->next != NULL)
2379 if (h->sort_key < hh->next->sort_key) break;
2387 hostlist = addrlist->host_list = newlist;
2391 /* Sort out the default port. */
2393 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2396 /* For each host-plus-IP-address on the list:
2398 . If this is a continued delivery and the host isn't the one with the
2399 current connection, skip.
2401 . If the status is unusable (i.e. previously failed or retry checked), skip.
2403 . If no IP address set, get the address, either by turning the name into
2404 an address, calling gethostbyname if gethostbyname is on, or by calling
2405 the DNS. The DNS may yield multiple addresses, in which case insert the
2406 extra ones into the list.
2408 . Get the retry data if not previously obtained for this address and set the
2409 field which remembers the state of this address. Skip if the retry time is
2410 not reached. If not, remember whether retry data was found. The retry string
2411 contains both the name and the IP address.
2413 . Scan the list of addresses and mark those whose status is DEFER as
2414 PENDING_DEFER. These are the only ones that will be processed in this cycle
2417 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2418 Some addresses may be successfully delivered, others may fail, and yet
2419 others may get temporary errors and so get marked DEFER.
2421 . The return from the delivery attempt is OK if a connection was made and a
2422 valid SMTP dialogue was completed. Otherwise it is DEFER.
2424 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2426 . If fail to connect, or other defer state, add a retry item.
2428 . If there are any addresses whose status is still DEFER, carry on to the
2429 next host/IPaddress, unless we have tried the number of hosts given
2430 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2431 there is some fancy logic for hosts_max_try that means its limit can be
2432 overstepped in some circumstances.
2434 If we get to the end of the list, all hosts have deferred at least one address,
2435 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2436 delivery attempt to those hosts whose last try was before the arrival time of
2437 the current message. To cope with this, we have to go round the loop a second
2438 time. After that, set the status and error data for any addresses that haven't
2439 had it set already. */
2441 for (cutoff_retry = 0; expired &&
2442 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2445 host_item *nexthost = NULL;
2446 int unexpired_hosts_tried = 0;
2448 for (host = hostlist;
2450 unexpired_hosts_tried < ob->hosts_max_try &&
2451 total_hosts_tried < ob->hosts_max_try_hardlimit;
2457 BOOL serialized = FALSE;
2458 BOOL host_is_expired = FALSE;
2459 BOOL message_defer = FALSE;
2460 BOOL ifchanges = FALSE;
2461 BOOL some_deferred = FALSE;
2462 address_item *first_addr = NULL;
2463 uschar *interface = NULL;
2464 uschar *retry_host_key = NULL;
2465 uschar *retry_message_key = NULL;
2466 uschar *serialize_key = NULL;
2468 /* Default next host is next host. :-) But this can vary if the
2469 hosts_max_try limit is hit (see below). It may also be reset if a host
2470 address is looked up here (in case the host was multihomed). */
2472 nexthost = host->next;
2474 /* If the address hasn't yet been obtained from the host name, look it up
2475 now, unless the host is already marked as unusable. If it is marked as
2476 unusable, it means that the router was unable to find its IP address (in
2477 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2478 the lookup failed last time. We don't get this far if *all* MX records
2479 point to non-existent hosts; that is treated as a hard error.
2481 We can just skip this host entirely. When the hosts came from the router,
2482 the address will timeout based on the other host(s); when the address is
2483 looked up below, there is an explicit retry record added.
2485 Note that we mustn't skip unusable hosts if the address is not unset; they
2486 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2488 if (host->address == NULL)
2490 int new_port, flags;
2492 uschar *canonical_name;
2494 if (host->status >= hstatus_unusable)
2496 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2501 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2503 /* The host name is permitted to have an attached port. Find it, and
2504 strip it from the name. Just remember it for now. */
2506 new_port = host_item_get_port(host);
2508 /* Count hosts looked up */
2512 /* Find by name if so configured, or if it's an IP address. We don't
2513 just copy the IP address, because we need the test-for-local to happen. */
2515 flags = HOST_FIND_BY_A;
2516 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2517 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2519 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2520 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2522 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2523 &canonical_name, NULL);
2525 /* Update the host (and any additional blocks, resulting from
2526 multihoming) with a host-specific port, if any. */
2528 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2530 /* Failure to find the host at this time (usually DNS temporary failure)
2531 is really a kind of routing failure rather than a transport failure.
2532 Therefore we add a retry item of the routing kind, not to stop us trying
2533 to look this name up here again, but to ensure the address gets timed
2534 out if the failures go on long enough. A complete failure at this point
2535 commonly points to a configuration error, but the best action is still
2536 to carry on for the next host. */
2538 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2540 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2542 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2543 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2544 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2545 host->status = hstatus_unusable;
2547 for (addr = addrlist; addr != NULL; addr = addr->next)
2549 if (addr->transport_return != DEFER) continue;
2550 addr->basic_errno = ERRNO_UNKNOWNHOST;
2552 string_sprintf("failed to lookup IP address for %s", host->name);
2557 /* If the host is actually the local host, we may have a problem, or
2558 there may be some cunning configuration going on. In the problem case,
2559 log things and give up. The default transport status is already DEFER. */
2561 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2563 for (addr = addrlist; addr != NULL; addr = addr->next)
2565 addr->basic_errno = 0;
2566 addr->message = string_sprintf("%s transport found host %s to be "
2567 "local", tblock->name, host->name);
2571 } /* End of block for IP address lookup */
2573 /* If this is a continued delivery, we are interested only in the host
2574 which matches the name of the existing open channel. The check is put
2575 here after the local host lookup, in case the name gets expanded as a
2576 result of the lookup. Set expired FALSE, to save the outer loop executing
2579 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2580 Ustrcmp(continue_host_address, host->address) != 0))
2583 continue; /* With next host */
2586 /* Reset the default next host in case a multihomed host whose addresses
2587 are not looked up till just above added to the host list. */
2589 nexthost = host->next;
2591 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2592 domain is in queue_smtp_domains, we don't actually want to attempt any
2593 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2594 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2595 were not in it. We don't want to hold up all SMTP deliveries! Except when
2596 doing a two-stage queue run, don't do this if forcing. */
2598 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2599 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2600 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2603 for (addr = addrlist; addr != NULL; addr = addr->next)
2605 if (addr->transport_return != DEFER) continue;
2606 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2608 continue; /* With next host */
2611 /* Count hosts being considered - purely for an intelligent comment
2612 if none are usable. */
2616 /* Set $host and $host address now in case they are needed for the
2617 interface expansion or the serialize_hosts check; they remain set if an
2618 actual delivery happens. */
2620 deliver_host = host->name;
2621 deliver_host_address = host->address;
2623 /* Set up a string for adding to the retry key if the port number is not
2624 the standard SMTP port. A host may have its own port setting that overrides
2627 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2629 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2631 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2632 string changes upon expansion, we must add it to the key that is used for
2633 retries, because connections to the same host from a different interface
2634 should be treated separately. */
2636 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2637 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2640 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2642 /* The first time round the outer loop, check the status of the host by
2643 inspecting the retry data. The second time round, we are interested only
2644 in expired hosts that haven't been tried since this message arrived. */
2646 if (cutoff_retry == 0)
2648 /* Ensure the status of the address is set by checking retry data if
2649 necessary. There maybe host-specific retry data (applicable to all
2650 messages) and also data for retries of a specific message at this host.
2651 If either of these retry records are actually read, the keys used are
2652 returned to save recomputing them later. */
2654 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2655 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2657 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2658 (host->address == NULL)? US"" : host->address, pistring,
2659 (host->status == hstatus_usable)? "usable" :
2660 (host->status == hstatus_unusable)? "unusable" :
2661 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2663 /* Skip this address if not usable at this time, noting if it wasn't
2664 actually expired, both locally and in the address. */
2666 switch (host->status)
2668 case hstatus_unusable:
2670 setflag(addrlist, af_retry_skipped);
2673 case hstatus_unusable_expired:
2676 case hwhy_retry: hosts_retry++; break;
2677 case hwhy_failed: hosts_fail++; break;
2678 case hwhy_deferred: hosts_defer++; break;
2681 /* If there was a retry message key, implying that previously there
2682 was a message-specific defer, we don't want to update the list of
2683 messages waiting for these hosts. */
2685 if (retry_message_key != NULL) update_waiting = FALSE;
2686 continue; /* With the next host or IP address */
2690 /* Second time round the loop: if the address is set but expired, and
2691 the message is newer than the last try, let it through. */
2695 if (host->address == NULL ||
2696 host->status != hstatus_unusable_expired ||
2697 host->last_try > received_time)
2700 debug_printf("trying expired host %s [%s]%s\n",
2701 host->name, host->address, pistring);
2702 host_is_expired = TRUE;
2705 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2706 it remains TRUE only if all hosts are expired and none are actually tried.
2711 /* If this host is listed as one to which access must be serialized,
2712 see if another Exim process has a connection to it, and if so, skip
2713 this host. If not, update the database to record our connection to it
2714 and remember this for later deletion. Do not do any of this if we are
2715 sending the message down a pre-existing connection. */
2718 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2719 host->address, NULL) == OK)
2721 serialize_key = string_sprintf("host-serialize-%s", host->name);
2722 if (!enq_start(serialize_key))
2725 debug_printf("skipping host %s because another Exim process "
2726 "is connected to it\n", host->name);
2733 /* OK, we have an IP address that is not waiting for its retry time to
2734 arrive (it might be expired) OR (second time round the loop) we have an
2735 expired host that hasn't been tried since the message arrived. Have a go
2736 at delivering the message to it. First prepare the addresses by flushing
2737 out the result of previous attempts, and finding the first address that
2738 is still to be delivered. */
2740 first_addr = prepare_addresses(addrlist, host);
2742 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2743 message_id, host->name, host->address, addrlist->address,
2744 (addrlist->next == NULL)? "" : ", ...");
2746 set_process_info("delivering %s to %s [%s] (%s%s)",
2747 message_id, host->name, host->address, addrlist->address,
2748 (addrlist->next == NULL)? "" : ", ...");
2750 /* This is not for real; don't do the delivery. If there are
2751 any remaining hosts, list them. */
2756 set_errno(addrlist, 0, NULL, OK, FALSE);
2757 for (addr = addrlist; addr != NULL; addr = addr->next)
2759 addr->host_used = host;
2760 addr->special_action = '*';
2761 addr->message = US"delivery bypassed by -N option";
2765 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2766 "*** host and remaining hosts:\n", tblock->name);
2767 for (host2 = host; host2 != NULL; host2 = host2->next)
2768 debug_printf(" %s [%s]\n", host2->name,
2769 (host2->address == NULL)? US"unset" : host2->address);
2774 /* This is for real. If the host is expired, we don't count it for
2775 hosts_max_retry. This ensures that all hosts must expire before an address
2776 is timed out, unless hosts_max_try_hardlimit (which protects against
2777 lunatic DNS configurations) is reached.
2779 If the host is not expired and we are about to hit the hosts_max_retry
2780 limit, check to see if there is a subsequent hosts with a different MX
2781 value. If so, make that the next host, and don't count this one. This is a
2782 heuristic to make sure that different MXs do get tried. With a normal kind
2783 of retry rule, they would get tried anyway when the earlier hosts were
2784 delayed, but if the domain has a "retry every time" type of rule - as is
2785 often used for the the very large ISPs, that won't happen. */
2789 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2793 debug_printf("hosts_max_try limit reached with this host\n");
2794 for (h = host; h != NULL; h = h->next)
2795 if (h->mx != host->mx) break;
2799 unexpired_hosts_tried--;
2800 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2801 "and will be tried\n");
2805 /* Attempt the delivery. */
2807 total_hosts_tried++;
2808 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2809 expanded_hosts != NULL, &message_defer, FALSE);
2812 OK => connection made, each address contains its result;
2813 message_defer is set for message-specific defers (when all
2814 recipients are marked defer)
2815 DEFER => there was a non-message-specific delivery problem;
2816 ERROR => there was a problem setting up the arguments for a filter,
2817 or there was a problem with expanding added headers
2820 /* If the result is not OK, there was a non-message-specific problem.
2821 If the result is DEFER, we need to write to the logs saying what happened
2822 for this particular host, except in the case of authentication and TLS
2823 failures, where the log has already been written. If all hosts defer a
2824 general message is written at the end. */
2826 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2827 first_addr->basic_errno != ERRNO_TLSFAILURE)
2828 write_logs(first_addr, host);
2830 /* If STARTTLS was accepted, but there was a failure in setting up the
2831 TLS session (usually a certificate screwup), and the host is not in
2832 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2833 TLS forcibly turned off. We have to start from scratch with a new SMTP
2834 connection. That's why the retry is done from here, not from within
2835 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2836 session, so the in-clear transmission after those errors, if permitted,
2837 happens inside smtp_deliver().] */
2840 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2841 ob->tls_tempfail_tryclear &&
2842 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2843 host->address, NULL) != OK)
2845 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2846 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2847 first_addr = prepare_addresses(addrlist, host);
2848 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2849 expanded_hosts != NULL, &message_defer, TRUE);
2850 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2851 write_logs(first_addr, host);
2856 /* Delivery attempt finished */
2858 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2861 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2862 message_id, host->name, host->address, addrlist->address,
2863 (addrlist->next == NULL)? "" : " (& others)", rs);
2865 /* Release serialization if set up */
2867 if (serialized) enq_end(serialize_key);
2869 /* If the result is DEFER, or if a host retry record is known to exist, we
2870 need to add an item to the retry chain for updating the retry database
2871 at the end of delivery. We only need to add the item to the top address,
2872 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2873 for any other delivery attempts using the same address. (It is copied into
2874 the unusable tree at the outer level, so even if different address blocks
2875 contain the same address, it still won't get tried again.) */
2877 if (rc == DEFER || retry_host_key != NULL)
2879 int delete_flag = (rc != DEFER)? rf_delete : 0;
2880 if (retry_host_key == NULL)
2882 retry_host_key = ob->retry_include_ip_address?
2883 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2884 string_sprintf("T:%S%s", host->name, pistring);
2887 /* If a delivery of another message over an existing SMTP connection
2888 yields DEFER, we do NOT set up retry data for the host. This covers the
2889 case when there are delays in routing the addresses in the second message
2890 that are so long that the server times out. This is alleviated by not
2891 routing addresses that previously had routing defers when handling an
2892 existing connection, but even so, this case may occur (e.g. if a
2893 previously happily routed address starts giving routing defers). If the
2894 host is genuinely down, another non-continued message delivery will
2895 notice it soon enough. */
2897 if (delete_flag != 0 || !continuing)
2898 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2900 /* We may have tried an expired host, if its retry time has come; ensure
2901 the status reflects the expiry for the benefit of any other addresses. */
2905 host->status = (host_is_expired)?
2906 hstatus_unusable_expired : hstatus_unusable;
2907 host->why = hwhy_deferred;
2911 /* If message_defer is set (host was OK, but every recipient got deferred
2912 because of some message-specific problem), or if that had happened
2913 previously so that a message retry key exists, add an appropriate item
2914 to the retry chain. Note that if there was a message defer but now there is
2915 a host defer, the message defer record gets deleted. That seems perfectly
2916 reasonable. Also, stop the message from being remembered as waiting
2917 for specific hosts. */
2919 if (message_defer || retry_message_key != NULL)
2921 int delete_flag = message_defer? 0 : rf_delete;
2922 if (retry_message_key == NULL)
2924 retry_message_key = ob->retry_include_ip_address?
2925 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2927 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2929 retry_add_item(addrlist, retry_message_key,
2930 rf_message | rf_host | delete_flag);
2931 update_waiting = FALSE;
2934 /* Any return other than DEFER (that is, OK or ERROR) means that the
2935 addresses have got their final statuses filled in for this host. In the OK
2936 case, see if any of them are deferred. */
2940 for (addr = addrlist; addr != NULL; addr = addr->next)
2942 if (addr->transport_return == DEFER)
2944 some_deferred = TRUE;
2950 /* If no addresses deferred or the result was ERROR, return. We do this for
2951 ERROR because a failing filter set-up or add_headers expansion is likely to
2952 fail for any host we try. */
2954 if (rc == ERROR || (rc == OK && !some_deferred))
2956 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2957 return TRUE; /* Each address has its status */
2960 /* If the result was DEFER or some individual addresses deferred, let
2961 the loop run to try other hosts with the deferred addresses, except for the
2962 case when we were trying to deliver down an existing channel and failed.
2963 Don't try any other hosts in this case. */
2965 if (continuing) break;
2967 /* If the whole delivery, or some individual addresses, were deferred and
2968 there are more hosts that could be tried, do not count this host towards
2969 the hosts_max_try limit if the age of the message is greater than the
2970 maximum retry time for this host. This means we may try try all hosts,
2971 ignoring the limit, when messages have been around for some time. This is
2972 important because if we don't try all hosts, the address will never time
2973 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2975 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2978 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2980 if (retry != NULL && retry->rules != NULL)
2982 retry_rule *last_rule;
2983 for (last_rule = retry->rules;
2984 last_rule->next != NULL;
2985 last_rule = last_rule->next);
2986 timedout = time(NULL) - received_time > last_rule->timeout;
2988 else timedout = TRUE; /* No rule => timed out */
2992 unexpired_hosts_tried--;
2993 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2994 "hosts_max_try (message older than host's retry time)\n");
2997 } /* End of loop for trying multiple hosts. */
2999 /* This is the end of the loop that repeats iff expired is TRUE and
3000 ob->delay_after_cutoff is FALSE. The second time round we will
3001 try those hosts that haven't been tried since the message arrived. */
3005 debug_printf("all IP addresses skipped or deferred at least one address\n");
3006 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3007 debug_printf("retrying IP addresses not tried since message arrived\n");
3012 /* Get here if all IP addresses are skipped or defer at least one address. In
3013 MUA wrapper mode, this will happen only for connection or other non-message-
3014 specific failures. Force the delivery status for all addresses to FAIL. */
3018 for (addr = addrlist; addr != NULL; addr = addr->next)
3019 addr->transport_return = FAIL;
3023 /* In the normal, non-wrapper case, add a standard message to each deferred
3024 address if there hasn't been an error, that is, if it hasn't actually been
3025 tried this time. The variable "expired" will be FALSE if any deliveries were
3026 actually tried, or if there was at least one host that was not expired. That
3027 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3028 a delivery has been tried, an error code will be set, and the failing of the
3029 message is handled by the retry code later.
3031 If queue_smtp is set, or this transport was called to send a subsequent message
3032 down an existing TCP/IP connection, and something caused the host not to be
3033 found, we end up here, but can detect these cases and handle them specially. */
3035 for (addr = addrlist; addr != NULL; addr = addr->next)
3037 /* If host is not NULL, it means that we stopped processing the host list
3038 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3039 means we need to behave as if some hosts were skipped because their retry
3040 time had not come. Specifically, this prevents the address from timing out.
3041 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3042 hosts were tried. */
3046 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3049 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3050 "hosts were tried\n");
3055 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3056 setflag(addr, af_retry_skipped);
3060 if (queue_smtp) /* no deliveries attempted */
3062 addr->transport_return = DEFER;
3063 addr->basic_errno = 0;
3064 addr->message = US"SMTP delivery explicitly queued";
3067 else if (addr->transport_return == DEFER &&
3068 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3069 addr->message == NULL)
3071 addr->basic_errno = ERRNO_HRETRY;
3072 if (continue_hostname != NULL)
3074 addr->message = US"no host found for existing SMTP connection";
3078 setflag(addr, af_pass_message); /* This is not a security risk */
3079 addr->message = (ob->delay_after_cutoff)?
3080 US"retry time not reached for any host after a long failure period" :
3081 US"all hosts have been failing for a long time and were last tried "
3082 "after this message arrived";
3084 /* If we are already using fallback hosts, or there are no fallback hosts
3085 defined, convert the result to FAIL to cause a bounce. */
3087 if (addr->host_list == addr->fallback_hosts ||
3088 addr->fallback_hosts == NULL)
3089 addr->transport_return = FAIL;
3093 if (hosts_retry == hosts_total)
3094 addr->message = US"retry time not reached for any host";
3095 else if (hosts_fail == hosts_total)
3096 addr->message = US"all host address lookups failed permanently";
3097 else if (hosts_defer == hosts_total)
3098 addr->message = US"all host address lookups failed temporarily";
3099 else if (hosts_serial == hosts_total)
3100 addr->message = US"connection limit reached for all hosts";
3101 else if (hosts_fail+hosts_defer == hosts_total)
3102 addr->message = US"all host address lookups failed";
3103 else addr->message = US"some host address lookups failed and retry time "
3104 "not reached for other hosts or connection limit reached";
3109 /* Update the database which keeps information about which messages are waiting
3110 for which hosts to become available. For some message-specific errors, the
3111 update_waiting flag is turned off because we don't want follow-on deliveries in
3114 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3118 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3120 return TRUE; /* Each address has its status */
3123 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob