1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2009 */
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 { "fallback_hosts", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
60 { "final_timeout", opt_time,
61 (void *)offsetof(smtp_transport_options_block, final_timeout) },
62 { "gethostbyname", opt_bool,
63 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
65 { "gnutls_require_kx", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
67 { "gnutls_require_mac", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
69 { "gnutls_require_protocols", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
72 { "helo_data", opt_stringptr,
73 (void *)offsetof(smtp_transport_options_block, helo_data) },
74 { "hosts", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, hosts) },
76 { "hosts_avoid_esmtp", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
78 { "hosts_avoid_pipelining", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
81 { "hosts_avoid_tls", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
84 { "hosts_max_try", opt_int,
85 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
86 { "hosts_max_try_hardlimit", opt_int,
87 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
89 { "hosts_nopass_tls", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
92 { "hosts_override", opt_bool,
93 (void *)offsetof(smtp_transport_options_block, hosts_override) },
94 { "hosts_randomize", opt_bool,
95 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
96 { "hosts_require_auth", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
99 { "hosts_require_tls", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
102 { "hosts_try_auth", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
104 { "interface", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, interface) },
106 { "keepalive", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, keepalive) },
108 { "lmtp_ignore_quota", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
110 { "max_rcpt", opt_int | opt_public,
111 (void *)offsetof(transport_instance, max_addresses) },
112 { "multi_domain", opt_bool | opt_public,
113 (void *)offsetof(transport_instance, multi_domain) },
114 { "port", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, port) },
116 { "protocol", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, protocol) },
118 { "retry_include_ip_address", opt_bool,
119 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
120 { "serialize_hosts", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
122 { "size_addition", opt_int,
123 (void *)offsetof(smtp_transport_options_block, size_addition) }
125 ,{ "tls_certificate", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
127 { "tls_crl", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, tls_crl) },
129 { "tls_privatekey", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
131 { "tls_require_ciphers", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
133 { "tls_tempfail_tryclear", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
135 { "tls_verify_certificates", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
140 /* Size of the options list. An extern variable has to be used so that its
141 address can appear in the tables drtables.c. */
143 int smtp_transport_options_count =
144 sizeof(smtp_transport_options)/sizeof(optionlist);
146 /* Default private options block for the smtp transport. */
148 smtp_transport_options_block smtp_transport_option_defaults = {
150 NULL, /* fallback_hosts */
152 NULL, /* fallback_hostlist */
153 NULL, /* authenticated_sender */
154 US"$primary_hostname", /* helo_data */
155 NULL, /* interface */
157 US"smtp", /* protocol */
158 NULL, /* serialize_hosts */
159 NULL, /* hosts_try_auth */
160 NULL, /* hosts_require_auth */
161 NULL, /* hosts_require_tls */
162 NULL, /* hosts_avoid_tls */
163 NULL, /* hosts_avoid_pipelining */
164 NULL, /* hosts_avoid_esmtp */
165 NULL, /* hosts_nopass_tls */
166 5*60, /* command_timeout */
167 5*60, /* connect_timeout; shorter system default overrides */
168 5*60, /* data timeout */
169 10*60, /* final timeout */
170 1024, /* size_addition */
171 5, /* hosts_max_try */
172 50, /* hosts_max_try_hardlimit */
173 TRUE, /* address_retry_include_sender */
174 FALSE, /* allow_localhost */
175 FALSE, /* authenticated_sender_force */
176 FALSE, /* gethostbyname */
177 TRUE, /* dns_qualify_single */
178 FALSE, /* dns_search_parents */
179 TRUE, /* delay_after_cutoff */
180 FALSE, /* hosts_override */
181 FALSE, /* hosts_randomize */
182 TRUE, /* keepalive */
183 FALSE, /* lmtp_ignore_quota */
184 TRUE /* retry_include_ip_address */
186 ,NULL, /* tls_certificate */
188 NULL, /* tls_privatekey */
189 NULL, /* tls_require_ciphers */
190 NULL, /* gnutls_require_kx */
191 NULL, /* gnutls_require_mac */
192 NULL, /* gnutls_require_proto */
193 NULL, /* tls_verify_certificates */
194 TRUE /* tls_tempfail_tryclear */
197 ,NULL, /* dkim_canon */
198 NULL, /* dkim_domain */
199 NULL, /* dkim_private_key */
200 NULL, /* dkim_selector */
201 NULL, /* dkim_sign_headers */
202 NULL /* dkim_strict */
209 static uschar *smtp_command; /* Points to last cmd for error messages */
210 static uschar *mail_command; /* Points to MAIL cmd for error messages */
211 static BOOL update_waiting; /* TRUE to update the "wait" database */
214 /*************************************************
215 * Setup entry point *
216 *************************************************/
218 /* This function is called when the transport is about to be used,
219 but before running it in a sub-process. It is used for two things:
221 (1) To set the fallback host list in addresses, when delivering.
222 (2) To pass back the interface, port, protocol, and other options, for use
223 during callout verification.
226 tblock pointer to the transport instance block
227 addrlist list of addresses about to be transported
228 tf if not NULL, pointer to block in which to return options
229 uid the uid that will be set (not used)
230 gid the gid that will be set (not used)
231 errmsg place for error message (not used)
233 Returns: OK always (FAIL, DEFER not used)
237 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
238 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
240 smtp_transport_options_block *ob =
241 (smtp_transport_options_block *)(tblock->options_block);
243 errmsg = errmsg; /* Keep picky compilers happy */
247 /* Pass back options if required. This interface is getting very messy. */
251 tf->interface = ob->interface;
253 tf->protocol = ob->protocol;
254 tf->hosts = ob->hosts;
255 tf->hosts_override = ob->hosts_override;
256 tf->hosts_randomize = ob->hosts_randomize;
257 tf->gethostbyname = ob->gethostbyname;
258 tf->qualify_single = ob->dns_qualify_single;
259 tf->search_parents = ob->dns_search_parents;
260 tf->helo_data = ob->helo_data;
263 /* Set the fallback host list for all the addresses that don't have fallback
264 host lists, provided that the local host wasn't present in the original host
267 if (!testflag(addrlist, af_local_host_removed))
269 for (; addrlist != NULL; addrlist = addrlist->next)
270 if (addrlist->fallback_hosts == NULL)
271 addrlist->fallback_hosts = ob->fallback_hostlist;
279 /*************************************************
280 * Initialization entry point *
281 *************************************************/
283 /* Called for each instance, after its options have been read, to
284 enable consistency checks to be done, or anything else that needs
287 Argument: pointer to the transport instance block
292 smtp_transport_init(transport_instance *tblock)
294 smtp_transport_options_block *ob =
295 (smtp_transport_options_block *)(tblock->options_block);
297 /* Retry_use_local_part defaults FALSE if unset */
299 if (tblock->retry_use_local_part == TRUE_UNSET)
300 tblock->retry_use_local_part = FALSE;
302 /* Set the default port according to the protocol */
304 if (ob->port == NULL)
305 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
306 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
308 /* Set up the setup entry point, to be called before subprocesses for this
311 tblock->setup = smtp_transport_setup;
313 /* Complain if any of the timeouts are zero. */
315 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
316 ob->final_timeout <= 0)
317 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
318 "command, data, or final timeout value is zero for %s transport",
321 /* If hosts_override is set and there are local hosts, set the global
322 flag that stops verify from showing router hosts. */
324 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
326 /* If there are any fallback hosts listed, build a chain of host items
327 for them, but do not do any lookups at this time. */
329 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
336 /*************************************************
337 * Set delivery info into all active addresses *
338 *************************************************/
340 /* Only addresses whose status is >= PENDING are relevant. A lesser
341 status means that an address is not currently being processed.
344 addrlist points to a chain of addresses
345 errno_value to put in each address's errno field
346 msg to put in each address's message field
347 rc to put in each address's transport_return field
348 pass_message if TRUE, set the "pass message" flag in the address
350 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
351 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
352 this particular type of timeout.
358 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
363 if (errno_value == ERRNO_CONNECTTIMEOUT)
365 errno_value = ETIMEDOUT;
366 orvalue = RTEF_CTOUT;
368 for (addr = addrlist; addr != NULL; addr = addr->next)
370 if (addr->transport_return < PENDING) continue;
371 addr->basic_errno = errno_value;
372 addr->more_errno |= orvalue;
376 if (pass_message) setflag(addr, af_pass_message);
378 addr->transport_return = rc;
384 /*************************************************
385 * Check an SMTP response *
386 *************************************************/
388 /* This function is given an errno code and the SMTP response buffer
389 to analyse, together with the host identification for generating messages. It
390 sets an appropriate message and puts the first digit of the response code into
391 the yield variable. If no response was actually read, a suitable digit is
395 host the current host, to get its name for messages
396 errno_value pointer to the errno value
397 more_errno from the top address for use with ERRNO_FILTER_FAIL
398 buffer the SMTP response buffer
399 yield where to put a one-digit SMTP response code
400 message where to put an errror message
401 pass_message set TRUE if message is an SMTP response
403 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
406 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
407 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
411 if (smtp_use_pipelining &&
412 (Ustrcmp(smtp_command, "MAIL") == 0 ||
413 Ustrcmp(smtp_command, "RCPT") == 0 ||
414 Ustrcmp(smtp_command, "DATA") == 0))
417 *yield = '4'; /* Default setting is to give a temporary error */
419 /* Handle response timeout */
421 if (*errno_value == ETIMEDOUT)
423 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
424 "after %s%s", host->name, host->address, pl, smtp_command);
425 if (transport_count > 0)
426 *message = US string_sprintf("%s (%d bytes written)", *message,
431 /* Handle malformed SMTP response */
433 if (*errno_value == ERRNO_SMTPFORMAT)
435 uschar *malfresp = string_printing(buffer);
436 while (isspace(*malfresp)) malfresp++;
438 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
439 "%s [%s] in response to %s%s", host->name, host->address, pl,
442 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
443 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
447 /* Handle a failed filter process error; can't send QUIT as we mustn't
450 if (*errno_value == ERRNO_FILTER_FAIL)
452 *message = US string_sprintf("transport filter process failed (%d)%s",
454 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
458 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
461 if (*errno_value == ERRNO_CHHEADER_FAIL)
464 US string_sprintf("failed to expand headers_add or headers_remove: %s",
465 expand_string_message);
469 /* Handle failure to write a complete data block */
471 if (*errno_value == ERRNO_WRITEINCOMPLETE)
473 *message = US string_sprintf("failed to write a data block");
477 /* Handle error responses from the remote mailer. */
481 uschar *s = string_printing(buffer);
482 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
483 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
484 *pass_message = TRUE;
489 /* No data was read. If there is no errno, this must be the EOF (i.e.
490 connection closed) case, which causes deferral. An explicit connection reset
491 error has the same effect. Otherwise, put the host's identity in the message,
492 leaving the errno value to be interpreted as well. In all cases, we have to
493 assume the connection is now dead. */
495 if (*errno_value == 0 || *errno_value == ECONNRESET)
497 *errno_value = ERRNO_SMTPCLOSED;
498 *message = US string_sprintf("Remote host %s [%s] closed connection "
499 "in response to %s%s", host->name, host->address, pl, smtp_command);
501 else *message = US string_sprintf("%s [%s]", host->name, host->address);
508 /*************************************************
509 * Write error message to logs *
510 *************************************************/
512 /* This writes to the main log and to the message log.
515 addr the address item containing error information
516 host the current host
522 write_logs(address_item *addr, host_item *host)
524 if (addr->message != NULL)
526 uschar *message = addr->message;
527 if (addr->basic_errno > 0)
528 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
529 log_write(0, LOG_MAIN, "%s", message);
530 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
535 ((log_extra_selector & LX_outgoing_port) != 0)?
536 string_sprintf("%s [%s]:%d", host->name, host->address,
537 (host->port == PORT_NONE)? 25 : host->port)
539 string_sprintf("%s [%s]", host->name, host->address);
540 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
541 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
542 strerror(addr->basic_errno));
548 /*************************************************
549 * Synchronize SMTP responses *
550 *************************************************/
552 /* This function is called from smtp_deliver() to receive SMTP responses from
553 the server, and match them up with the commands to which they relate. When
554 PIPELINING is not in use, this function is called after every command, and is
555 therefore somewhat over-engineered, but it is simpler to use a single scheme
556 that works both with and without PIPELINING instead of having two separate sets
559 The set of commands that are buffered up with pipelining may start with MAIL
560 and may end with DATA; in between are RCPT commands that correspond to the
561 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
562 etc.) are never buffered.
564 Errors after MAIL or DATA abort the whole process leaving the response in the
565 buffer. After MAIL, pending responses are flushed, and the original command is
566 re-instated in big_buffer for error messages. For RCPT commands, the remote is
567 permitted to reject some recipient addresses while accepting others. However
568 certain errors clearly abort the whole process. Set the value in
569 transport_return to PENDING_OK if the address is accepted. If there is a
570 subsequent general error, it will get reset accordingly. If not, it will get
571 converted to OK at the end.
574 addrlist the complete address list
575 include_affixes TRUE if affixes include in RCPT
576 sync_addr ptr to the ptr of the one to start scanning at (updated)
577 host the host we are connected to
578 count the number of responses to read
580 include_sender true if 4xx retry is to include the sender it its key
581 pending_MAIL true if the first response is for MAIL
582 pending_DATA 0 if last command sent was not DATA
583 +1 if previously had a good recipient
584 -1 if not previously had a good recipient
585 inblock incoming SMTP block
586 timeout timeout value
587 buffer buffer for reading response
588 buffsize size of buffer
590 Returns: 3 if at least one address had 2xx and one had 5xx
591 2 if at least one address had 5xx but none had 2xx
592 1 if at least one host had a 2xx response, but none had 5xx
593 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
594 -1 timeout while reading RCPT response
595 -2 I/O or other non-response error for RCPT
596 -3 DATA or MAIL failed - errno and buffer set
600 sync_responses(address_item *addrlist, BOOL include_affixes,
601 address_item **sync_addr, host_item *host, int count,
602 BOOL address_retry_include_sender, BOOL pending_MAIL,
603 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
606 address_item *addr = *sync_addr;
609 /* Handle the response for a MAIL command. On error, reinstate the original
610 command in big_buffer for error message use, and flush any further pending
611 responses before returning, except after I/O errors and timeouts. */
616 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
618 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
619 if (errno == 0 && buffer[0] != 0)
621 uschar flushbuffer[4096];
623 if (buffer[0] == '4')
625 save_errno = ERRNO_MAIL4XX;
626 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
630 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
632 && (errno != 0 || flushbuffer[0] == 0))
641 if (pending_DATA) count--; /* Number of RCPT responses to come */
643 /* Read and handle the required number of RCPT responses, matching each one up
644 with an address by scanning for the next address whose status is PENDING_DEFER.
649 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
651 /* The address was accepted */
653 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
656 addr->transport_return = PENDING_OK;
658 /* If af_dr_retry_exists is set, there was a routing delay on this address;
659 ensure that any address-specific retry record is expunged. We do this both
660 for the basic key and for the version that also includes the sender. */
662 if (testflag(addr, af_dr_retry_exists))
664 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
666 retry_add_item(addr, altkey, rf_delete);
667 retry_add_item(addr, addr->address_retry_key, rf_delete);
671 /* Timeout while reading the response */
673 else if (errno == ETIMEDOUT)
675 int save_errno = errno;
676 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
677 "after RCPT TO:<%s>", host->name, host->address,
678 transport_rcpt_address(addr, include_affixes));
679 set_errno(addrlist, save_errno, message, DEFER, FALSE);
680 retry_add_item(addr, addr->address_retry_key, 0);
681 update_waiting = FALSE;
685 /* Handle other errors in obtaining an SMTP response by returning -1. This
686 will cause all the addresses to be deferred. Restore the SMTP command in
687 big_buffer for which we are checking the response, so the error message
690 else if (errno != 0 || buffer[0] == 0)
692 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
693 transport_rcpt_address(addr, include_affixes));
697 /* Handle SMTP permanent and temporary response codes. */
702 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
703 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
704 host->name, host->address, string_printing(buffer));
705 setflag(addr, af_pass_message);
706 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
708 /* The response was 5xx */
710 if (buffer[0] == '5')
712 addr->transport_return = FAIL;
716 /* The response was 4xx */
720 addr->transport_return = DEFER;
721 addr->basic_errno = ERRNO_RCPT4XX;
722 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
724 /* Log temporary errors if there are more hosts to be tried. */
726 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
728 /* Do not put this message on the list of those waiting for specific
729 hosts, as otherwise it is likely to be tried too often. */
731 update_waiting = FALSE;
733 /* Add a retry item for the address so that it doesn't get tried again
734 too soon. If address_retry_include_sender is true, add the sender address
737 if (address_retry_include_sender)
739 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
741 retry_add_item(addr, altkey, 0);
743 else retry_add_item(addr, addr->address_retry_key, 0);
746 } /* Loop for next RCPT response */
748 /* Update where to start at for the next block of responses, unless we
749 have already handled all the addresses. */
751 if (addr != NULL) *sync_addr = addr->next;
753 /* Handle a response to DATA. If we have not had any good recipients, either
754 previously or in this block, the response is ignored. */
756 if (pending_DATA != 0 &&
757 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
762 if (pending_DATA > 0 || (yield & 1) != 0)
764 if (errno == 0 && buffer[0] == '4')
766 errno = ERRNO_DATA4XX;
767 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
771 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
772 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
773 "is in use and there were no good recipients\n", msg);
776 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
777 present) received 3xx. If any RCPTs were handled and yielded anything other
778 than 4xx, yield will be set non-zero. */
785 /*************************************************
786 * Deliver address list to given host *
787 *************************************************/
789 /* If continue_hostname is not null, we get here only when continuing to
790 deliver down an existing channel. The channel was passed as the standard
791 input. TLS is never active on a passed channel; the previous process always
792 closes it down before passing the connection on.
794 Otherwise, we have to make a connection to the remote host, and do the
795 initial protocol exchange.
797 When running as an MUA wrapper, if the sender or any recipient is rejected,
798 temporarily or permanently, we force failure for all recipients.
801 addrlist chain of potential addresses to deliver; only those whose
802 transport_return field is set to PENDING_DEFER are currently
803 being processed; others should be skipped - they have either
804 been delivered to an earlier host or IP address, or been
805 failed by one of them.
806 host host to deliver to
807 host_af AF_INET or AF_INET6
808 port default TCP/IP port to use, in host byte order
809 interface interface to bind to, or NULL
810 tblock transport instance block
811 copy_host TRUE if host set in addr->host_used must be copied, because
812 it is specific to this call of the transport
813 message_defer set TRUE if yield is OK, but all addresses were deferred
814 because of a non-recipient, non-host failure, that is, a
815 4xx response to MAIL FROM, DATA, or ".". This is a defer
816 that is specific to the message.
817 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
818 a second attempt after TLS initialization fails
820 Returns: OK - the connection was made and the delivery attempted;
821 the result for each address is in its data block.
822 DEFER - the connection could not be made, or something failed
823 while setting up the SMTP session, or there was a
824 non-message-specific error, such as a timeout.
825 ERROR - a filter command is specified for this transport,
826 and there was a problem setting it up; OR helo_data
827 or add_headers or authenticated_sender is specified
828 for this transport, and the string failed to expand
832 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
833 uschar *interface, transport_instance *tblock, BOOL copy_host,
834 BOOL *message_defer, BOOL suppress_tls)
837 address_item *sync_addr;
838 address_item *first_addr = addrlist;
843 time_t start_delivery_time = time(NULL);
844 smtp_transport_options_block *ob =
845 (smtp_transport_options_block *)(tblock->options_block);
846 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
847 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
849 BOOL send_rset = TRUE;
850 BOOL send_quit = TRUE;
851 BOOL setting_up = TRUE;
852 BOOL completed_address = FALSE;
855 BOOL pass_message = FALSE;
856 smtp_inblock inblock;
857 smtp_outblock outblock;
858 int max_rcpt = tblock->max_addresses;
859 uschar *igquotstr = US"";
860 uschar *local_authenticated_sender = authenticated_sender;
861 uschar *helo_data = NULL;
862 uschar *message = NULL;
863 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
866 uschar inbuffer[4096];
867 uschar outbuffer[1024];
869 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
871 *message_defer = FALSE;
872 smtp_command = US"initial connection";
873 if (max_rcpt == 0) max_rcpt = 999999;
875 /* Set up the buffer for reading SMTP response packets. */
877 inblock.buffer = inbuffer;
878 inblock.buffersize = sizeof(inbuffer);
879 inblock.ptr = inbuffer;
880 inblock.ptrend = inbuffer;
882 /* Set up the buffer for holding SMTP commands while pipelining */
884 outblock.buffer = outbuffer;
885 outblock.buffersize = sizeof(outbuffer);
886 outblock.ptr = outbuffer;
887 outblock.cmd_count = 0;
888 outblock.authenticating = FALSE;
890 /* Reset the parameters of a TLS session. */
895 /* If an authenticated_sender override has been specified for this transport
896 instance, expand it. If the expansion is forced to fail, and there was already
897 an authenticated_sender for this message, the original value will be used.
898 Other expansion failures are serious. An empty result is ignored, but there is
899 otherwise no check - this feature is expected to be used with LMTP and other
900 cases where non-standard addresses (e.g. without domains) might be required. */
902 if (ob->authenticated_sender != NULL)
904 uschar *new = expand_string(ob->authenticated_sender);
907 if (!expand_string_forcedfail)
909 uschar *message = string_sprintf("failed to expand "
910 "authenticated_sender: %s", expand_string_message);
911 set_errno(addrlist, 0, message, DEFER, FALSE);
915 else if (new[0] != 0) local_authenticated_sender = new;
921 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
926 /* Make a connection to the host if this isn't a continued delivery, and handle
927 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
928 specially so they can be identified for retries. */
930 if (continue_hostname == NULL)
932 inblock.sock = outblock.sock =
933 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
934 ob->keepalive); /* This puts port into host->port */
936 if (inblock.sock < 0)
938 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
943 /* Expand the greeting message while waiting for the initial response. (Makes
944 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
945 delayed till here so that $sending_interface and $sending_port are set. */
947 helo_data = expand_string(ob->helo_data);
949 /* The first thing is to wait for an initial OK response. The dreaded "goto"
950 is nevertheless a reasonably clean way of programming this kind of logic,
951 where you want to escape on any error. */
955 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
956 ob->command_timeout)) goto RESPONSE_FAILED;
958 /* Now check if the helo_data expansion went well, and sign off cleanly if
961 if (helo_data == NULL)
963 uschar *message = string_sprintf("failed to expand helo_data: %s",
964 expand_string_message);
965 set_errno(addrlist, 0, message, DEFER, FALSE);
971 /** Debugging without sending a message
972 addrlist->transport_return = DEFER;
976 /* Errors that occur after this point follow an SMTP command, which is
977 left in big_buffer by smtp_write_command() for use in error messages. */
979 smtp_command = big_buffer;
981 /* Tell the remote who we are...
983 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
984 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
985 greeting is of this form. The assumption was that the far end supports it
986 properly... but experience shows that there are some that give 5xx responses,
987 even though the banner includes "ESMTP" (there's a bloody-minded one that
988 says "ESMTP not spoken here"). Cope with that case.
990 September 2000: Time has passed, and it seems reasonable now to always send
991 EHLO at the start. It is also convenient to make the change while installing
994 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
995 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
996 would be no way to send out the mails, so there is now a host list
997 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
998 PIPELINING problem as well. Maybe it can also be useful to cure other
999 problems with broken servers.
1001 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1002 Then somebody tried it with a Microsoft mailer... It seems that all other
1003 mailers use upper case for some reason (the RFC is quite clear about case
1004 independence) so, for peace of mind, I gave in. */
1006 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1007 host->name, host->address, NULL) != OK;
1009 /* Alas; be careful, since this goto is not an error-out, so conceivably
1010 we might set data between here and the target which we assume to exist
1011 and be usable. I can see this coming back to bite us. */
1016 suppress_tls = FALSE;
1017 ob->tls_tempfail_tryclear = FALSE;
1018 smtp_command = US"SSL-on-connect";
1025 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1026 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1028 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1029 ob->command_timeout))
1031 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1038 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1043 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1045 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1046 ob->command_timeout)) goto RESPONSE_FAILED;
1049 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1050 lmtp_ignore_quota option was set. */
1052 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1053 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1054 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1056 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1059 tls_offered = esmtp &&
1060 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1061 PCRE_EOPT, NULL, 0) >= 0;
1065 /* For continuing deliveries down the same channel, the socket is the standard
1066 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1067 below). Set up the pointer to where subsequent commands will be left, for
1068 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1069 set from the command line if they were set in the process that passed the
1074 inblock.sock = outblock.sock = fileno(stdin);
1075 smtp_command = big_buffer;
1076 host->port = port; /* Record the port that was used */
1079 /* If TLS is available on this connection, whether continued or not, attempt to
1080 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1081 send another EHLO - the server may give a different answer in secure mode. We
1082 use a separate buffer for reading the response to STARTTLS so that if it is
1083 negative, the original EHLO data is available for subsequent analysis, should
1084 the client not be required to use TLS. If the response is bad, copy the buffer
1085 for error analysis. */
1088 if (tls_offered && !suppress_tls &&
1089 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1090 host->address, NULL) != OK)
1092 uschar buffer2[4096];
1093 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1096 /* If there is an I/O error, transmission of this message is deferred. If
1097 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1098 false, we also defer. However, if there is a temporary rejection of STARTTLS
1099 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1100 STARTTLS, we carry on. This means we will try to send the message in clear,
1101 unless the host is in hosts_require_tls (tested below). */
1103 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1104 ob->command_timeout))
1106 if (errno != 0 || buffer2[0] == 0 ||
1107 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1109 Ustrncpy(buffer, buffer2, sizeof(buffer));
1110 goto RESPONSE_FAILED;
1114 /* STARTTLS accepted: try to negotiate a TLS session. */
1119 int rc = tls_client_start(inblock.sock,
1122 NULL, /* No DH param */
1123 ob->tls_certificate,
1125 ob->tls_verify_certificates,
1127 ob->tls_require_ciphers,
1128 ob->gnutls_require_mac,
1129 ob->gnutls_require_kx,
1130 ob->gnutls_require_proto,
1131 ob->command_timeout);
1133 /* TLS negotiation failed; give an error. From outside, this function may
1134 be called again to try in clear on a new connection, if the options permit
1135 it for this host. */
1139 save_errno = ERRNO_TLSFAILURE;
1140 message = US"failure while setting up TLS session";
1145 /* TLS session is set up */
1147 for (addr = addrlist; addr != NULL; addr = addr->next)
1149 if (addr->transport_return == PENDING_DEFER)
1151 addr->cipher = tls_cipher;
1152 addr->peerdn = tls_peerdn;
1158 /* if smtps, we'll have smtp_command set to something else; always safe to
1160 smtp_command = big_buffer;
1162 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1163 helo_data is null, we are dealing with a connection that was passed from
1164 another process, and so we won't have expanded helo_data above. We have to
1165 expand it here. $sending_ip_address and $sending_port are set up right at the
1166 start of the Exim process (in exim.c). */
1168 if (tls_active >= 0)
1171 if (helo_data == NULL)
1173 helo_data = expand_string(ob->helo_data);
1174 if (helo_data == NULL)
1176 uschar *message = string_sprintf("failed to expand helo_data: %s",
1177 expand_string_message);
1178 set_errno(addrlist, 0, message, DEFER, FALSE);
1184 /* For SMTPS we need to wait for the initial OK response.
1185 Also, it seems likely that a server not supporting STARTTLS is broken
1186 enough to perhaps not support EHLO. */
1189 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1190 ob->command_timeout)) goto RESPONSE_FAILED;
1192 greeting_cmd = "EHLO";
1195 greeting_cmd = "HELO";
1197 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1201 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1202 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1204 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1205 ob->command_timeout))
1206 goto RESPONSE_FAILED;
1209 /* If the host is required to use a secure channel, ensure that we
1212 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1213 host->address, NULL) == OK)
1215 save_errno = ERRNO_TLSREQUIRED;
1216 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1217 host->name, host->address,
1218 tls_offered? "an attempt to start TLS failed" :
1219 "the server did not offer TLS support");
1224 /* If TLS is active, we have just started it up and re-done the EHLO command,
1225 so its response needs to be analyzed. If TLS is not active and this is a
1226 continued session down a previously-used socket, we haven't just done EHLO, so
1229 if (continue_hostname == NULL
1236 uschar *fail_reason = US"server did not advertise AUTH support";
1238 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1239 lmtp_ignore_quota option was set. */
1241 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1242 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1243 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1245 /* If the response to EHLO specified support for the SIZE parameter, note
1246 this, provided size_addition is non-negative. */
1248 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1249 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1250 PCRE_EOPT, NULL, 0) >= 0;
1252 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1253 the current host, esmtp will be false, so PIPELINING can never be used. If
1254 the current host matches hosts_avoid_pipelining, don't do it. */
1256 smtp_use_pipelining = esmtp &&
1257 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1258 host->address, NULL) != OK &&
1259 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1260 PCRE_EOPT, NULL, 0) >= 0;
1262 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1263 smtp_use_pipelining? "" : "not ");
1265 /* Note if the response to EHLO specifies support for the AUTH extension.
1266 If it has, check that this host is one we want to authenticate to, and do
1267 the business. The host name and address must be available when the
1268 authenticator's client driver is running. */
1270 smtp_authenticated = FALSE;
1271 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1272 host->name, host->address, NULL);
1274 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1276 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1277 expand_nmax = -1; /* reset */
1279 /* Must not do this check until after we have saved the result of the
1280 regex match above. */
1282 if (require_auth == OK ||
1283 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1284 host->address, NULL) == OK)
1287 fail_reason = US"no common mechanisms were found";
1289 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1291 /* Scan the configured authenticators looking for one which is configured
1292 for use as a client, which is not suppressed by client_condition, and
1293 whose name matches an authentication mechanism supported by the server.
1294 If one is found, attempt to authenticate by calling its client function.
1297 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1301 (au->client_condition != NULL &&
1302 !expand_check_condition(au->client_condition, au->name,
1303 US"client authenticator")))
1305 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1307 (au->client)? "client_condition is false" :
1308 "not configured as a client");
1312 /* Loop to scan supported server mechanisms */
1317 int len = Ustrlen(au->public_name);
1318 while (isspace(*p)) p++;
1320 if (strncmpic(au->public_name, p, len) != 0 ||
1321 (p[len] != 0 && !isspace(p[len])))
1323 while (*p != 0 && !isspace(*p)) p++;
1327 /* Found data for a listed mechanism. Call its client entry. Set
1328 a flag in the outblock so that data is overwritten after sending so
1329 that reflections don't show it. */
1331 fail_reason = US"authentication attempt(s) failed";
1332 outblock.authenticating = TRUE;
1333 rc = (au->info->clientcode)(au, &inblock, &outblock,
1334 ob->command_timeout, buffer, sizeof(buffer));
1335 outblock.authenticating = FALSE;
1336 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1339 /* A temporary authentication failure must hold up delivery to
1340 this host. After a permanent authentication failure, we carry on
1341 to try other authentication methods. If all fail hard, try to
1342 deliver the message unauthenticated unless require_auth was set. */
1347 smtp_authenticated = TRUE; /* stops the outer loop */
1350 /* Failure after writing a command */
1355 /* Failure after reading a response */
1358 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1359 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1360 au->name, host->name, host->address, buffer);
1363 /* Failure by some other means. In effect, the authenticator
1364 decided it wasn't prepared to handle this case. Typically this
1365 is the result of "fail" in an expansion string. Do we need to
1366 log anything here? Feb 2006: a message is now put in the buffer
1367 if logging is required. */
1371 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1372 "authentication H=%s [%s] %s", au->name, host->name,
1373 host->address, buffer);
1376 /* Internal problem, message in buffer. */
1380 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1384 break; /* If not authenticated, try next authenticator */
1385 } /* Loop for scanning supported server mechanisms */
1386 } /* Loop for further authenticators */
1390 /* If we haven't authenticated, but are required to, give up. */
1392 if (require_auth == OK && !smtp_authenticated)
1395 set_errno(addrlist, ERRNO_AUTHFAIL,
1396 string_sprintf("authentication required but %s", fail_reason), DEFER,
1402 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1403 message-specific. */
1407 /* If there is a filter command specified for this transport, we can now
1408 set it up. This cannot be done until the identify of the host is known. */
1410 if (tblock->filter_command != NULL)
1414 sprintf(CS buffer, "%.50s transport", tblock->name);
1415 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1416 TRUE, DEFER, addrlist, buffer, NULL);
1417 transport_filter_timeout = tblock->filter_timeout;
1419 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1424 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1432 /* For messages that have more than the maximum number of envelope recipients,
1433 we want to send several transactions down the same SMTP connection. (See
1434 comments in deliver.c as to how this reconciles, heuristically, with
1435 remote_max_parallel.) This optimization was added to Exim after the following
1436 code was already working. The simplest way to put it in without disturbing the
1437 code was to use a goto to jump back to this point when there is another
1438 transaction to handle. */
1441 sync_addr = first_addr;
1445 completed_address = FALSE;
1448 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1449 qualification, send it, adding something to the message size to allow for
1450 imprecision and things that get added en route. Exim keeps the number of lines
1451 in a message, so we can give an accurate value for the original message, but we
1452 need some additional to handle added headers. (Double "." characters don't get
1453 included in the count.) */
1460 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1464 /* Add the authenticated sender address if present */
1466 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1467 local_authenticated_sender != NULL)
1469 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1470 auth_xtextencode(local_authenticated_sender,
1471 Ustrlen(local_authenticated_sender)));
1474 /* From here until we send the DATA command, we can make use of PIPELINING
1475 if the server host supports it. The code has to be able to check the responses
1476 at any point, for when the buffer fills up, so we write it totally generally.
1477 When PIPELINING is off, each command written reports that it has flushed the
1480 pending_MAIL = TRUE; /* The block starts with MAIL */
1482 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1483 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1484 mail_command = string_copy(big_buffer); /* Save for later error message */
1488 case -1: /* Transmission error */
1491 case +1: /* Block was sent */
1492 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1493 ob->command_timeout))
1495 if (errno == 0 && buffer[0] == '4')
1497 errno = ERRNO_MAIL4XX;
1498 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1500 goto RESPONSE_FAILED;
1502 pending_MAIL = FALSE;
1506 /* Pass over all the relevant recipient addresses for this host, which are the
1507 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1508 several before we have to read the responses for those seen so far. This
1509 checking is done by a subroutine because it also needs to be done at the end.
1510 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1511 the next one if not all are sent.
1513 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1514 last address because we want to abort if any recipients have any kind of
1515 problem, temporary or permanent. We know that all recipient addresses will have
1516 the PENDING_DEFER status, because only one attempt is ever made, and we know
1517 that max_rcpt will be large, so all addresses will be done at once. */
1519 for (addr = first_addr;
1520 address_count < max_rcpt && addr != NULL;
1526 if (addr->transport_return != PENDING_DEFER) continue;
1529 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1531 /* Now send the RCPT command, and process outstanding responses when
1532 necessary. After a timeout on RCPT, we just end the function, leaving the
1533 yield as OK, because this error can often mean that there is a problem with
1534 just one address, so we don't want to delay the host. */
1536 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1537 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1538 if (count < 0) goto SEND_FAILED;
1541 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1542 &sync_addr, host, count, ob->address_retry_include_sender,
1543 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1546 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1547 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1550 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1551 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1552 case 0: /* No 2xx or 5xx, but no probs */
1555 case -1: goto END_OFF; /* Timeout on RCPT */
1556 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1558 pending_MAIL = FALSE; /* Dealt with MAIL */
1560 } /* Loop for next address */
1562 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1563 permanently or temporarily. We should have flushed and synced after the last
1568 address_item *badaddr;
1569 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1571 if (badaddr->transport_return != PENDING_OK) break;
1573 if (badaddr != NULL)
1575 set_errno(addrlist, 0, badaddr->message, FAIL,
1576 testflag(badaddr, af_pass_message));
1581 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1582 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1583 have a good recipient buffered up if we are pipelining. We don't want to waste
1584 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1585 are pipelining. The responses are all handled by sync_responses(). */
1587 if (ok || (smtp_use_pipelining && !mua_wrapper))
1589 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1590 if (count < 0) goto SEND_FAILED;
1591 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1592 host, count, ob->address_retry_include_sender, pending_MAIL,
1593 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1595 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1596 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1599 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1600 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1601 case 0: break; /* No 2xx or 5xx, but no probs */
1603 case -1: goto END_OFF; /* Timeout on RCPT */
1604 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1608 /* Save the first address of the next batch. */
1612 /* If there were no good recipients (but otherwise there have been no
1613 problems), just set ok TRUE, since we have handled address-specific errors
1614 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1615 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1616 well as body. Set the appropriate timeout value to be used for each chunk.
1617 (Haven't been able to make it work using select() for writing yet.) */
1619 if (!ok) ok = TRUE; else
1621 sigalrm_seen = FALSE;
1622 transport_write_timeout = ob->data_timeout;
1623 smtp_command = US"sending data block"; /* For error messages */
1624 DEBUG(D_transport|D_v)
1625 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1626 transport_count = 0;
1627 #ifndef DISABLE_DKIM
1628 ok = dkim_transport_write_message(addrlist, inblock.sock,
1629 topt_use_crlf | topt_end_dot | topt_escape_headers |
1630 (tblock->body_only? topt_no_headers : 0) |
1631 (tblock->headers_only? topt_no_body : 0) |
1632 (tblock->return_path_add? topt_add_return_path : 0) |
1633 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1634 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1635 0, /* No size limit */
1636 tblock->add_headers, tblock->remove_headers,
1637 US".", US"..", /* Escaping strings */
1638 tblock->rewrite_rules, tblock->rewrite_existflags,
1639 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1640 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1643 ok = transport_write_message(addrlist, inblock.sock,
1644 topt_use_crlf | topt_end_dot | topt_escape_headers |
1645 (tblock->body_only? topt_no_headers : 0) |
1646 (tblock->headers_only? topt_no_body : 0) |
1647 (tblock->return_path_add? topt_add_return_path : 0) |
1648 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1649 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1650 0, /* No size limit */
1651 tblock->add_headers, tblock->remove_headers,
1652 US".", US"..", /* Escaping strings */
1653 tblock->rewrite_rules, tblock->rewrite_existflags);
1656 /* transport_write_message() uses write() because it is called from other
1657 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1658 it can exit with "Broken pipe" as its error. This really means that the
1659 socket got closed at the far end. */
1661 transport_write_timeout = 0; /* for subsequent transports */
1663 /* Failure can either be some kind of I/O disaster (including timeout),
1664 or the failure of a transport filter or the expansion of added headers. */
1668 buffer[0] = 0; /* There hasn't been a response */
1669 goto RESPONSE_FAILED;
1672 /* We used to send the terminating "." explicitly here, but because of
1673 buffering effects at both ends of TCP/IP connections, you don't gain
1674 anything by keeping it separate, so it might as well go in the final
1675 data buffer for efficiency. This is now done by setting the topt_end_dot
1678 smtp_command = US"end of data";
1680 /* For SMTP, we now read a single response that applies to the whole message.
1681 If it is OK, then all the addresses have been delivered. */
1685 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1687 if (!ok && errno == 0 && buffer[0] == '4')
1689 errno = ERRNO_DATA4XX;
1690 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1694 /* For LMTP, we get back a response for every RCPT command that we sent;
1695 some may be accepted and some rejected. For those that get a response, their
1696 status is fixed; any that are accepted have been handed over, even if later
1697 responses crash - at least, that's how I read RFC 2033.
1699 If all went well, mark the recipient addresses as completed, record which
1700 host/IPaddress they were delivered to, and cut out RSET when sending another
1701 message down the same channel. Write the completed addresses to the journal
1702 now so that they are recorded in case there is a crash of hardware or
1703 software before the spool gets updated. Also record the final SMTP
1704 confirmation if needed (for SMTP only). */
1709 int delivery_time = (int)(time(NULL) - start_delivery_time);
1712 uschar *conf = NULL;
1715 /* Make a copy of the host if it is local to this invocation
1716 of the transport. */
1720 thost = store_get(sizeof(host_item));
1722 thost->name = string_copy(host->name);
1723 thost->address = string_copy(host->address);
1727 /* Set up confirmation if needed - applies only to SMTP */
1729 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1731 uschar *s = string_printing(buffer);
1732 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1735 /* Process all transported addresses - for LMTP, read a status for
1738 for (addr = addrlist; addr != first_addr; addr = addr->next)
1740 if (addr->transport_return != PENDING_OK) continue;
1742 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1743 remaining addresses. Otherwise, it's a return code for just the one
1744 address. For temporary errors, add a retry item for the address so that
1745 it doesn't get tried again too soon. */
1749 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1752 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1753 addr->message = string_sprintf("LMTP error after %s: %s",
1754 big_buffer, string_printing(buffer));
1755 setflag(addr, af_pass_message); /* Allow message to go to user */
1756 if (buffer[0] == '5')
1757 addr->transport_return = FAIL;
1760 errno = ERRNO_DATA4XX;
1761 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1762 addr->transport_return = DEFER;
1763 retry_add_item(addr, addr->address_retry_key, 0);
1767 completed_address = TRUE; /* NOW we can set this flag */
1768 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1770 uschar *s = string_printing(buffer);
1771 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1775 /* SMTP, or success return from LMTP for this address. Pass back the
1776 actual host that was used. */
1778 addr->transport_return = OK;
1779 addr->more_errno = delivery_time;
1780 addr->host_used = thost;
1781 addr->special_action = flag;
1782 addr->message = conf;
1785 /* Update the journal. For homonymic addresses, use the base address plus
1786 the transport name. See lots of comments in deliver.c about the reasons
1787 for the complications when homonyms are involved. Just carry on after
1788 write error, as it may prove possible to update the spool file later. */
1790 if (testflag(addr, af_homonym))
1791 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1793 sprintf(CS buffer, "%.500s\n", addr->unique);
1795 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1796 len = Ustrlen(CS buffer);
1797 if (write(journal_fd, buffer, len) != len)
1798 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1799 "%s: %s", buffer, strerror(errno));
1802 /* Ensure the journal file is pushed out to disk. */
1804 if (EXIMfsync(journal_fd) < 0)
1805 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1811 /* Handle general (not specific to one address) failures here. The value of ok
1812 is used to skip over this code on the falling through case. A timeout causes a
1813 deferral. Other errors may defer or fail according to the response code, and
1814 may set up a special errno value, e.g. after connection chopped, which is
1815 assumed if errno == 0 and there is no text in the buffer. If control reaches
1816 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1817 the problem is not related to this specific message. */
1826 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1827 buffer, &code, &message, &pass_message);
1833 message = US string_sprintf("send() to %s [%s] failed: %s",
1834 host->name, host->address, strerror(save_errno));
1838 /* This label is jumped to directly when a TLS negotiation has failed,
1839 or was not done for a host for which it is required. Values will be set
1840 in message and save_errno, and setting_up will always be true. Treat as
1841 a temporary error. */
1848 /* If the failure happened while setting up the call, see if the failure was
1849 a 5xx response (this will either be on connection, or following HELO - a 5xx
1850 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1851 never going to accept them. For other errors during setting up (timeouts or
1852 whatever), defer all addresses, and yield DEFER, so that the host is not
1853 tried again for a while. */
1856 ok = FALSE; /* For when reached by GOTO */
1862 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1866 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1871 /* We want to handle timeouts after MAIL or "." and loss of connection after
1872 "." specially. They can indicate a problem with the sender address or with
1873 the contents of the message rather than a real error on the connection. These
1874 cases are treated in the same way as a 4xx response. This next bit of code
1875 does the classification. */
1886 message_error = TRUE;
1890 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1891 Ustrncmp(smtp_command,"end ",4) == 0;
1894 case ERRNO_SMTPCLOSED:
1895 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1899 message_error = FALSE;
1903 /* Handle the cases that are treated as message errors. These are:
1905 (a) negative response or timeout after MAIL
1906 (b) negative response after DATA
1907 (c) negative response or timeout or dropped connection after "."
1909 It won't be a negative response or timeout after RCPT, as that is dealt
1910 with separately above. The action in all cases is to set an appropriate
1911 error code for all the addresses, but to leave yield set to OK because the
1912 host itself has not failed. Of course, it might in practice have failed
1913 when we've had a timeout, but if so, we'll discover that at the next
1914 delivery attempt. For a temporary error, set the message_defer flag, and
1915 write to the logs for information if this is not the last host. The error
1916 for the last host will be logged as part of the address's log line. */
1920 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1921 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1924 /* If there's an errno, the message contains just the identity of
1927 if (code != '5') /* Anything other than 5 is treated as temporary */
1930 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1931 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1932 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1933 *message_defer = TRUE;
1937 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1938 ".", or some other transportation error. We defer all addresses and yield
1939 DEFER, except for the case of failed add_headers expansion, or a transport
1940 filter failure, when the yield should be ERROR, to stop it trying other
1945 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1946 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1947 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1953 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1954 SMTP session tidily. However, if there were too many addresses to send in one
1955 message (indicated by first_addr being non-NULL) we want to carry on with the
1956 rest of them. Also, it is desirable to send more than one message down the SMTP
1957 connection if there are several waiting, provided we haven't already sent so
1958 many as to hit the configured limit. The function transport_check_waiting looks
1959 for a waiting message and returns its id. Then transport_pass_socket tries to
1960 set up a continued delivery by passing the socket on to another process. The
1961 variable send_rset is FALSE if a message has just been successfully transfered.
1963 If we are already sending down a continued channel, there may be further
1964 addresses not yet delivered that are aimed at the same host, but which have not
1965 been passed in this run of the transport. In this case, continue_more will be
1966 true, and all we should do is send RSET if necessary, and return, leaving the
1969 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1970 do not want to continue with other messages down the same channel, because that
1971 can lead to looping between two or more messages, all with the same,
1972 temporarily failing address(es). [The retry information isn't updated yet, so
1973 new processes keep on trying.] We probably also don't want to try more of this
1974 message's addresses either.
1976 If we have started a TLS session, we have to end it before passing the
1977 connection to a new process. However, not all servers can handle this (Exim
1978 can), so we do not pass such a connection on if the host matches
1979 hosts_nopass_tls. */
1982 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
1983 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
1984 continue_more, yield, (first_addr == NULL)? "":"not ");
1986 if (completed_address && ok && send_quit)
1989 if (first_addr != NULL || continue_more ||
1992 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
1993 host->address, NULL) != OK)
1995 transport_check_waiting(tblock->name, host->name,
1996 tblock->connection_max_messages, new_message_id, &more)
2004 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2006 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2007 host->address, strerror(save_errno));
2010 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2011 ob->command_timeout)))
2014 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2018 DEBUG(D_transport) debug_printf("%s\n", msg);
2023 /* Either RSET was not needed, or it succeeded */
2027 if (first_addr != NULL) /* More addresses still to be sent */
2028 { /* in this run of the transport */
2029 continue_sequence++; /* Causes * in logging */
2032 if (continue_more) return yield; /* More addresses for another run */
2034 /* Pass the socket to a new Exim process. Before doing so, we must shut
2035 down TLS. Not all MTAs allow for the continuation of the SMTP session
2036 when TLS is shut down. We test for this by sending a new EHLO. If we
2037 don't get a good response, we don't attempt to pass the socket on. */
2040 if (tls_active >= 0)
2046 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2047 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2048 ob->command_timeout);
2052 /* If the socket is successfully passed, we musn't send QUIT (or
2053 indeed anything!) from here. */
2055 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2056 new_message_id, inblock.sock))
2062 /* If RSET failed and there are addresses left, they get deferred. */
2064 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2068 /* End off tidily with QUIT unless the connection has died or the socket has
2069 been passed to another process. There has been discussion on the net about what
2070 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2071 to wait for a response, but on the other hand, there isn't anything one can do
2072 with an error response, other than log it. Exim used to do that. However,
2073 further discussion suggested that it is positively advantageous not to wait for
2074 the response, but to close the session immediately. This is supposed to move
2075 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2076 load from the server. (Hosts that are both servers and clients may not see much
2077 difference, of course.) Further discussion indicated that this was safe to do
2078 on Unix systems which have decent implementations of TCP/IP that leave the
2079 connection around for a while (TIME_WAIT) after the application has gone away.
2080 This enables the response sent by the server to be properly ACKed rather than
2081 timed out, as can happen on broken TCP/IP implementations on other OS.
2083 This change is being made on 31-Jul-98. After over a year of trouble-free
2084 operation, the old commented-out code was removed on 17-Sep-99. */
2087 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2095 /* Close the socket, and return the appropriate value, first setting
2096 continue_transport and continue_hostname NULL to prevent any other addresses
2097 that may include the host from trying to re-use a continuation socket. This
2098 works because the NULL setting is passed back to the calling process, and
2099 remote_max_parallel is forced to 1 when delivering over an existing connection,
2101 If all went well and continue_more is set, we shouldn't actually get here if
2102 there are further addresses, as the return above will be taken. However,
2103 writing RSET might have failed, or there may be other addresses whose hosts are
2104 specified in the transports, and therefore not visible at top level, in which
2105 case continue_more won't get set. */
2107 (void)close(inblock.sock);
2108 continue_transport = NULL;
2109 continue_hostname = NULL;
2116 /*************************************************
2117 * Closedown entry point *
2118 *************************************************/
2120 /* This function is called when exim is passed an open smtp channel
2121 from another incarnation, but the message which it has been asked
2122 to deliver no longer exists. The channel is on stdin.
2124 We might do fancy things like looking for another message to send down
2125 the channel, but if the one we sought has gone, it has probably been
2126 delivered by some other process that itself will seek further messages,
2127 so just close down our connection.
2129 Argument: pointer to the transport instance block
2134 smtp_transport_closedown(transport_instance *tblock)
2136 smtp_transport_options_block *ob =
2137 (smtp_transport_options_block *)(tblock->options_block);
2138 smtp_inblock inblock;
2139 smtp_outblock outblock;
2141 uschar inbuffer[4096];
2142 uschar outbuffer[16];
2144 inblock.sock = fileno(stdin);
2145 inblock.buffer = inbuffer;
2146 inblock.buffersize = sizeof(inbuffer);
2147 inblock.ptr = inbuffer;
2148 inblock.ptrend = inbuffer;
2150 outblock.sock = inblock.sock;
2151 outblock.buffersize = sizeof(outbuffer);
2152 outblock.buffer = outbuffer;
2153 outblock.ptr = outbuffer;
2154 outblock.cmd_count = 0;
2155 outblock.authenticating = FALSE;
2157 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2158 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2159 ob->command_timeout);
2160 (void)close(inblock.sock);
2165 /*************************************************
2166 * Prepare addresses for delivery *
2167 *************************************************/
2169 /* This function is called to flush out error settings from previous delivery
2170 attempts to other hosts. It also records whether we got here via an MX record
2171 or not in the more_errno field of the address. We are interested only in
2172 addresses that are still marked DEFER - others may have got delivered to a
2173 previously considered IP address. Set their status to PENDING_DEFER to indicate
2174 which ones are relevant this time.
2177 addrlist the list of addresses
2178 host the host we are delivering to
2180 Returns: the first address for this delivery
2183 static address_item *
2184 prepare_addresses(address_item *addrlist, host_item *host)
2186 address_item *first_addr = NULL;
2188 for (addr = addrlist; addr != NULL; addr = addr->next)
2190 if (addr->transport_return != DEFER) continue;
2191 if (first_addr == NULL) first_addr = addr;
2192 addr->transport_return = PENDING_DEFER;
2193 addr->basic_errno = 0;
2194 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2195 addr->message = NULL;
2197 addr->cipher = NULL;
2198 addr->peerdn = NULL;
2206 /*************************************************
2207 * Main entry point *
2208 *************************************************/
2210 /* See local README for interface details. As this is a remote transport, it is
2211 given a chain of addresses to be delivered in one connection, if possible. It
2212 always returns TRUE, indicating that each address has its own independent
2213 status set, except if there is a setting up problem, in which case it returns
2217 smtp_transport_entry(
2218 transport_instance *tblock, /* data for this instantiation */
2219 address_item *addrlist) /* addresses we are working on */
2223 int hosts_defer = 0;
2225 int hosts_looked_up = 0;
2226 int hosts_retry = 0;
2227 int hosts_serial = 0;
2228 int hosts_total = 0;
2229 int total_hosts_tried = 0;
2231 BOOL expired = TRUE;
2232 BOOL continuing = continue_hostname != NULL;
2233 uschar *expanded_hosts = NULL;
2235 uschar *tid = string_sprintf("%s transport", tblock->name);
2236 smtp_transport_options_block *ob =
2237 (smtp_transport_options_block *)(tblock->options_block);
2238 host_item *hostlist = addrlist->host_list;
2239 host_item *host = NULL;
2243 debug_printf("%s transport entered\n", tblock->name);
2244 for (addr = addrlist; addr != NULL; addr = addr->next)
2245 debug_printf(" %s\n", addr->address);
2246 if (continuing) debug_printf("already connected to %s [%s]\n",
2247 continue_hostname, continue_host_address);
2250 /* Set the flag requesting that these hosts be added to the waiting
2251 database if the delivery fails temporarily or if we are running with
2252 queue_smtp or a 2-stage queue run. This gets unset for certain
2253 kinds of error, typically those that are specific to the message. */
2255 update_waiting = TRUE;
2257 /* If a host list is not defined for the addresses - they must all have the
2258 same one in order to be passed to a single transport - or if the transport has
2259 a host list with hosts_override set, use the host list supplied with the
2260 transport. It is an error for this not to exist. */
2262 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2264 if (ob->hosts == NULL)
2266 addrlist->message = string_sprintf("%s transport called with no hosts set",
2268 addrlist->transport_return = PANIC;
2269 return FALSE; /* Only top address has status */
2272 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2275 /* If the transport's host list contains no '$' characters, and we are not
2276 randomizing, it is fixed and therefore a chain of hosts can be built once
2277 and for all, and remembered for subsequent use by other calls to this
2278 transport. If, on the other hand, the host list does contain '$', or we are
2279 randomizing its order, we have to rebuild it each time. In the fixed case,
2280 as the hosts string will never be used again, it doesn't matter that we
2281 replace all the : characters with zeros. */
2283 if (ob->hostlist == NULL)
2285 uschar *s = ob->hosts;
2287 if (Ustrchr(s, '$') != NULL)
2289 expanded_hosts = expand_string(s);
2290 if (expanded_hosts == NULL)
2292 addrlist->message = string_sprintf("failed to expand list of hosts "
2293 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2294 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2295 return FALSE; /* Only top address has status */
2297 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2298 "\"%s\"\n", s, expanded_hosts);
2302 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2304 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2306 /* Check that the expansion yielded something useful. */
2307 if (hostlist == NULL)
2310 string_sprintf("%s transport has empty hosts setting", tblock->name);
2311 addrlist->transport_return = PANIC;
2312 return FALSE; /* Only top address has status */
2315 /* If there was no expansion of hosts, save the host list for
2318 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2321 /* This is not the first time this transport has been run in this delivery;
2322 the host list was built previously. */
2324 else hostlist = ob->hostlist;
2327 /* The host list was supplied with the address. If hosts_randomize is set, we
2328 must sort it into a random order if it did not come from MX records and has not
2329 already been randomized (but don't bother if continuing down an existing
2332 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2334 host_item *newlist = NULL;
2335 while (hostlist != NULL)
2337 host_item *h = hostlist;
2338 hostlist = hostlist->next;
2340 h->sort_key = random_number(100);
2342 if (newlist == NULL)
2347 else if (h->sort_key < newlist->sort_key)
2354 host_item *hh = newlist;
2355 while (hh->next != NULL)
2357 if (h->sort_key < hh->next->sort_key) break;
2365 hostlist = addrlist->host_list = newlist;
2369 /* Sort out the default port. */
2371 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2374 /* For each host-plus-IP-address on the list:
2376 . If this is a continued delivery and the host isn't the one with the
2377 current connection, skip.
2379 . If the status is unusable (i.e. previously failed or retry checked), skip.
2381 . If no IP address set, get the address, either by turning the name into
2382 an address, calling gethostbyname if gethostbyname is on, or by calling
2383 the DNS. The DNS may yield multiple addresses, in which case insert the
2384 extra ones into the list.
2386 . Get the retry data if not previously obtained for this address and set the
2387 field which remembers the state of this address. Skip if the retry time is
2388 not reached. If not, remember whether retry data was found. The retry string
2389 contains both the name and the IP address.
2391 . Scan the list of addresses and mark those whose status is DEFER as
2392 PENDING_DEFER. These are the only ones that will be processed in this cycle
2395 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2396 Some addresses may be successfully delivered, others may fail, and yet
2397 others may get temporary errors and so get marked DEFER.
2399 . The return from the delivery attempt is OK if a connection was made and a
2400 valid SMTP dialogue was completed. Otherwise it is DEFER.
2402 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2404 . If fail to connect, or other defer state, add a retry item.
2406 . If there are any addresses whose status is still DEFER, carry on to the
2407 next host/IPaddress, unless we have tried the number of hosts given
2408 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2409 there is some fancy logic for hosts_max_try that means its limit can be
2410 overstepped in some circumstances.
2412 If we get to the end of the list, all hosts have deferred at least one address,
2413 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2414 delivery attempt to those hosts whose last try was before the arrival time of
2415 the current message. To cope with this, we have to go round the loop a second
2416 time. After that, set the status and error data for any addresses that haven't
2417 had it set already. */
2419 for (cutoff_retry = 0; expired &&
2420 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2423 host_item *nexthost = NULL;
2424 int unexpired_hosts_tried = 0;
2426 for (host = hostlist;
2428 unexpired_hosts_tried < ob->hosts_max_try &&
2429 total_hosts_tried < ob->hosts_max_try_hardlimit;
2435 BOOL serialized = FALSE;
2436 BOOL host_is_expired = FALSE;
2437 BOOL message_defer = FALSE;
2438 BOOL ifchanges = FALSE;
2439 BOOL some_deferred = FALSE;
2440 address_item *first_addr = NULL;
2441 uschar *interface = NULL;
2442 uschar *retry_host_key = NULL;
2443 uschar *retry_message_key = NULL;
2444 uschar *serialize_key = NULL;
2446 /* Default next host is next host. :-) But this can vary if the
2447 hosts_max_try limit is hit (see below). It may also be reset if a host
2448 address is looked up here (in case the host was multihomed). */
2450 nexthost = host->next;
2452 /* If the address hasn't yet been obtained from the host name, look it up
2453 now, unless the host is already marked as unusable. If it is marked as
2454 unusable, it means that the router was unable to find its IP address (in
2455 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2456 the lookup failed last time. We don't get this far if *all* MX records
2457 point to non-existent hosts; that is treated as a hard error.
2459 We can just skip this host entirely. When the hosts came from the router,
2460 the address will timeout based on the other host(s); when the address is
2461 looked up below, there is an explicit retry record added.
2463 Note that we mustn't skip unusable hosts if the address is not unset; they
2464 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2466 if (host->address == NULL)
2468 int new_port, flags;
2470 uschar *canonical_name;
2472 if (host->status >= hstatus_unusable)
2474 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2479 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2481 /* The host name is permitted to have an attached port. Find it, and
2482 strip it from the name. Just remember it for now. */
2484 new_port = host_item_get_port(host);
2486 /* Count hosts looked up */
2490 /* Find by name if so configured, or if it's an IP address. We don't
2491 just copy the IP address, because we need the test-for-local to happen. */
2493 flags = HOST_FIND_BY_A;
2494 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2495 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2497 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2498 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2500 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2501 &canonical_name, NULL);
2503 /* Update the host (and any additional blocks, resulting from
2504 multihoming) with a host-specific port, if any. */
2506 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2508 /* Failure to find the host at this time (usually DNS temporary failure)
2509 is really a kind of routing failure rather than a transport failure.
2510 Therefore we add a retry item of the routing kind, not to stop us trying
2511 to look this name up here again, but to ensure the address gets timed
2512 out if the failures go on long enough. A complete failure at this point
2513 commonly points to a configuration error, but the best action is still
2514 to carry on for the next host. */
2516 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2518 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2520 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2521 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2522 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2523 host->status = hstatus_unusable;
2525 for (addr = addrlist; addr != NULL; addr = addr->next)
2527 if (addr->transport_return != DEFER) continue;
2528 addr->basic_errno = ERRNO_UNKNOWNHOST;
2530 string_sprintf("failed to lookup IP address for %s", host->name);
2535 /* If the host is actually the local host, we may have a problem, or
2536 there may be some cunning configuration going on. In the problem case,
2537 log things and give up. The default transport status is already DEFER. */
2539 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2541 for (addr = addrlist; addr != NULL; addr = addr->next)
2543 addr->basic_errno = 0;
2544 addr->message = string_sprintf("%s transport found host %s to be "
2545 "local", tblock->name, host->name);
2549 } /* End of block for IP address lookup */
2551 /* If this is a continued delivery, we are interested only in the host
2552 which matches the name of the existing open channel. The check is put
2553 here after the local host lookup, in case the name gets expanded as a
2554 result of the lookup. Set expired FALSE, to save the outer loop executing
2557 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2558 Ustrcmp(continue_host_address, host->address) != 0))
2561 continue; /* With next host */
2564 /* Reset the default next host in case a multihomed host whose addresses
2565 are not looked up till just above added to the host list. */
2567 nexthost = host->next;
2569 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2570 domain is in queue_smtp_domains, we don't actually want to attempt any
2571 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2572 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2573 were not in it. We don't want to hold up all SMTP deliveries! Except when
2574 doing a two-stage queue run, don't do this if forcing. */
2576 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2577 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2578 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2581 for (addr = addrlist; addr != NULL; addr = addr->next)
2583 if (addr->transport_return != DEFER) continue;
2584 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2586 continue; /* With next host */
2589 /* Count hosts being considered - purely for an intelligent comment
2590 if none are usable. */
2594 /* Set $host and $host address now in case they are needed for the
2595 interface expansion or the serialize_hosts check; they remain set if an
2596 actual delivery happens. */
2598 deliver_host = host->name;
2599 deliver_host_address = host->address;
2601 /* Set up a string for adding to the retry key if the port number is not
2602 the standard SMTP port. A host may have its own port setting that overrides
2605 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2607 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2609 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2610 string changes upon expansion, we must add it to the key that is used for
2611 retries, because connections to the same host from a different interface
2612 should be treated separately. */
2614 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2615 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2618 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2620 /* The first time round the outer loop, check the status of the host by
2621 inspecting the retry data. The second time round, we are interested only
2622 in expired hosts that haven't been tried since this message arrived. */
2624 if (cutoff_retry == 0)
2626 /* Ensure the status of the address is set by checking retry data if
2627 necessary. There maybe host-specific retry data (applicable to all
2628 messages) and also data for retries of a specific message at this host.
2629 If either of these retry records are actually read, the keys used are
2630 returned to save recomputing them later. */
2632 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2633 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2635 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2636 (host->address == NULL)? US"" : host->address, pistring,
2637 (host->status == hstatus_usable)? "usable" :
2638 (host->status == hstatus_unusable)? "unusable" :
2639 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2641 /* Skip this address if not usable at this time, noting if it wasn't
2642 actually expired, both locally and in the address. */
2644 switch (host->status)
2646 case hstatus_unusable:
2648 setflag(addrlist, af_retry_skipped);
2651 case hstatus_unusable_expired:
2654 case hwhy_retry: hosts_retry++; break;
2655 case hwhy_failed: hosts_fail++; break;
2656 case hwhy_deferred: hosts_defer++; break;
2659 /* If there was a retry message key, implying that previously there
2660 was a message-specific defer, we don't want to update the list of
2661 messages waiting for these hosts. */
2663 if (retry_message_key != NULL) update_waiting = FALSE;
2664 continue; /* With the next host or IP address */
2668 /* Second time round the loop: if the address is set but expired, and
2669 the message is newer than the last try, let it through. */
2673 if (host->address == NULL ||
2674 host->status != hstatus_unusable_expired ||
2675 host->last_try > received_time)
2678 debug_printf("trying expired host %s [%s]%s\n",
2679 host->name, host->address, pistring);
2680 host_is_expired = TRUE;
2683 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2684 it remains TRUE only if all hosts are expired and none are actually tried.
2689 /* If this host is listed as one to which access must be serialized,
2690 see if another Exim process has a connection to it, and if so, skip
2691 this host. If not, update the database to record our connection to it
2692 and remember this for later deletion. Do not do any of this if we are
2693 sending the message down a pre-existing connection. */
2696 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2697 host->address, NULL) == OK)
2699 serialize_key = string_sprintf("host-serialize-%s", host->name);
2700 if (!enq_start(serialize_key))
2703 debug_printf("skipping host %s because another Exim process "
2704 "is connected to it\n", host->name);
2711 /* OK, we have an IP address that is not waiting for its retry time to
2712 arrive (it might be expired) OR (second time round the loop) we have an
2713 expired host that hasn't been tried since the message arrived. Have a go
2714 at delivering the message to it. First prepare the addresses by flushing
2715 out the result of previous attempts, and finding the first address that
2716 is still to be delivered. */
2718 first_addr = prepare_addresses(addrlist, host);
2720 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2721 message_id, host->name, host->address, addrlist->address,
2722 (addrlist->next == NULL)? "" : ", ...");
2724 set_process_info("delivering %s to %s [%s] (%s%s)",
2725 message_id, host->name, host->address, addrlist->address,
2726 (addrlist->next == NULL)? "" : ", ...");
2728 /* This is not for real; don't do the delivery. If there are
2729 any remaining hosts, list them. */
2734 set_errno(addrlist, 0, NULL, OK, FALSE);
2735 for (addr = addrlist; addr != NULL; addr = addr->next)
2737 addr->host_used = host;
2738 addr->special_action = '*';
2739 addr->message = US"delivery bypassed by -N option";
2743 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2744 "*** host and remaining hosts:\n", tblock->name);
2745 for (host2 = host; host2 != NULL; host2 = host2->next)
2746 debug_printf(" %s [%s]\n", host2->name,
2747 (host2->address == NULL)? US"unset" : host2->address);
2752 /* This is for real. If the host is expired, we don't count it for
2753 hosts_max_retry. This ensures that all hosts must expire before an address
2754 is timed out, unless hosts_max_try_hardlimit (which protects against
2755 lunatic DNS configurations) is reached.
2757 If the host is not expired and we are about to hit the hosts_max_retry
2758 limit, check to see if there is a subsequent hosts with a different MX
2759 value. If so, make that the next host, and don't count this one. This is a
2760 heuristic to make sure that different MXs do get tried. With a normal kind
2761 of retry rule, they would get tried anyway when the earlier hosts were
2762 delayed, but if the domain has a "retry every time" type of rule - as is
2763 often used for the the very large ISPs, that won't happen. */
2767 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2771 debug_printf("hosts_max_try limit reached with this host\n");
2772 for (h = host; h != NULL; h = h->next)
2773 if (h->mx != host->mx) break;
2777 unexpired_hosts_tried--;
2778 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2779 "and will be tried\n");
2783 /* Attempt the delivery. */
2785 total_hosts_tried++;
2786 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2787 expanded_hosts != NULL, &message_defer, FALSE);
2790 OK => connection made, each address contains its result;
2791 message_defer is set for message-specific defers (when all
2792 recipients are marked defer)
2793 DEFER => there was a non-message-specific delivery problem;
2794 ERROR => there was a problem setting up the arguments for a filter,
2795 or there was a problem with expanding added headers
2798 /* If the result is not OK, there was a non-message-specific problem.
2799 If the result is DEFER, we need to write to the logs saying what happened
2800 for this particular host, except in the case of authentication and TLS
2801 failures, where the log has already been written. If all hosts defer a
2802 general message is written at the end. */
2804 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2805 first_addr->basic_errno != ERRNO_TLSFAILURE)
2806 write_logs(first_addr, host);
2808 /* If STARTTLS was accepted, but there was a failure in setting up the
2809 TLS session (usually a certificate screwup), and the host is not in
2810 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2811 TLS forcibly turned off. We have to start from scratch with a new SMTP
2812 connection. That's why the retry is done from here, not from within
2813 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2814 session, so the in-clear transmission after those errors, if permitted,
2815 happens inside smtp_deliver().] */
2818 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2819 ob->tls_tempfail_tryclear &&
2820 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2821 host->address, NULL) != OK)
2823 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2824 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2825 first_addr = prepare_addresses(addrlist, host);
2826 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2827 expanded_hosts != NULL, &message_defer, TRUE);
2828 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2829 write_logs(first_addr, host);
2834 /* Delivery attempt finished */
2836 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2839 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2840 message_id, host->name, host->address, addrlist->address,
2841 (addrlist->next == NULL)? "" : " (& others)", rs);
2843 /* Release serialization if set up */
2845 if (serialized) enq_end(serialize_key);
2847 /* If the result is DEFER, or if a host retry record is known to exist, we
2848 need to add an item to the retry chain for updating the retry database
2849 at the end of delivery. We only need to add the item to the top address,
2850 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2851 for any other delivery attempts using the same address. (It is copied into
2852 the unusable tree at the outer level, so even if different address blocks
2853 contain the same address, it still won't get tried again.) */
2855 if (rc == DEFER || retry_host_key != NULL)
2857 int delete_flag = (rc != DEFER)? rf_delete : 0;
2858 if (retry_host_key == NULL)
2860 retry_host_key = ob->retry_include_ip_address?
2861 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2862 string_sprintf("T:%S%s", host->name, pistring);
2865 /* If a delivery of another message over an existing SMTP connection
2866 yields DEFER, we do NOT set up retry data for the host. This covers the
2867 case when there are delays in routing the addresses in the second message
2868 that are so long that the server times out. This is alleviated by not
2869 routing addresses that previously had routing defers when handling an
2870 existing connection, but even so, this case may occur (e.g. if a
2871 previously happily routed address starts giving routing defers). If the
2872 host is genuinely down, another non-continued message delivery will
2873 notice it soon enough. */
2875 if (delete_flag != 0 || !continuing)
2876 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2878 /* We may have tried an expired host, if its retry time has come; ensure
2879 the status reflects the expiry for the benefit of any other addresses. */
2883 host->status = (host_is_expired)?
2884 hstatus_unusable_expired : hstatus_unusable;
2885 host->why = hwhy_deferred;
2889 /* If message_defer is set (host was OK, but every recipient got deferred
2890 because of some message-specific problem), or if that had happened
2891 previously so that a message retry key exists, add an appropriate item
2892 to the retry chain. Note that if there was a message defer but now there is
2893 a host defer, the message defer record gets deleted. That seems perfectly
2894 reasonable. Also, stop the message from being remembered as waiting
2895 for specific hosts. */
2897 if (message_defer || retry_message_key != NULL)
2899 int delete_flag = message_defer? 0 : rf_delete;
2900 if (retry_message_key == NULL)
2902 retry_message_key = ob->retry_include_ip_address?
2903 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2905 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2907 retry_add_item(addrlist, retry_message_key,
2908 rf_message | rf_host | delete_flag);
2909 update_waiting = FALSE;
2912 /* Any return other than DEFER (that is, OK or ERROR) means that the
2913 addresses have got their final statuses filled in for this host. In the OK
2914 case, see if any of them are deferred. */
2918 for (addr = addrlist; addr != NULL; addr = addr->next)
2920 if (addr->transport_return == DEFER)
2922 some_deferred = TRUE;
2928 /* If no addresses deferred or the result was ERROR, return. We do this for
2929 ERROR because a failing filter set-up or add_headers expansion is likely to
2930 fail for any host we try. */
2932 if (rc == ERROR || (rc == OK && !some_deferred))
2934 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2935 return TRUE; /* Each address has its status */
2938 /* If the result was DEFER or some individual addresses deferred, let
2939 the loop run to try other hosts with the deferred addresses, except for the
2940 case when we were trying to deliver down an existing channel and failed.
2941 Don't try any other hosts in this case. */
2943 if (continuing) break;
2945 /* If the whole delivery, or some individual addresses, were deferred and
2946 there are more hosts that could be tried, do not count this host towards
2947 the hosts_max_try limit if the age of the message is greater than the
2948 maximum retry time for this host. This means we may try try all hosts,
2949 ignoring the limit, when messages have been around for some time. This is
2950 important because if we don't try all hosts, the address will never time
2951 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2953 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2956 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2958 if (retry != NULL && retry->rules != NULL)
2960 retry_rule *last_rule;
2961 for (last_rule = retry->rules;
2962 last_rule->next != NULL;
2963 last_rule = last_rule->next);
2964 timedout = time(NULL) - received_time > last_rule->timeout;
2966 else timedout = TRUE; /* No rule => timed out */
2970 unexpired_hosts_tried--;
2971 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2972 "hosts_max_try (message older than host's retry time)\n");
2975 } /* End of loop for trying multiple hosts. */
2977 /* This is the end of the loop that repeats iff expired is TRUE and
2978 ob->delay_after_cutoff is FALSE. The second time round we will
2979 try those hosts that haven't been tried since the message arrived. */
2983 debug_printf("all IP addresses skipped or deferred at least one address\n");
2984 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
2985 debug_printf("retrying IP addresses not tried since message arrived\n");
2990 /* Get here if all IP addresses are skipped or defer at least one address. In
2991 MUA wrapper mode, this will happen only for connection or other non-message-
2992 specific failures. Force the delivery status for all addresses to FAIL. */
2996 for (addr = addrlist; addr != NULL; addr = addr->next)
2997 addr->transport_return = FAIL;
3001 /* In the normal, non-wrapper case, add a standard message to each deferred
3002 address if there hasn't been an error, that is, if it hasn't actually been
3003 tried this time. The variable "expired" will be FALSE if any deliveries were
3004 actually tried, or if there was at least one host that was not expired. That
3005 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3006 a delivery has been tried, an error code will be set, and the failing of the
3007 message is handled by the retry code later.
3009 If queue_smtp is set, or this transport was called to send a subsequent message
3010 down an existing TCP/IP connection, and something caused the host not to be
3011 found, we end up here, but can detect these cases and handle them specially. */
3013 for (addr = addrlist; addr != NULL; addr = addr->next)
3015 /* If host is not NULL, it means that we stopped processing the host list
3016 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3017 means we need to behave as if some hosts were skipped because their retry
3018 time had not come. Specifically, this prevents the address from timing out.
3019 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3020 hosts were tried. */
3024 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3027 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3028 "hosts were tried\n");
3033 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3034 setflag(addr, af_retry_skipped);
3038 if (queue_smtp) /* no deliveries attempted */
3040 addr->transport_return = DEFER;
3041 addr->basic_errno = 0;
3042 addr->message = US"SMTP delivery explicitly queued";
3045 else if (addr->transport_return == DEFER &&
3046 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3047 addr->message == NULL)
3049 addr->basic_errno = ERRNO_HRETRY;
3050 if (continue_hostname != NULL)
3052 addr->message = US"no host found for existing SMTP connection";
3056 setflag(addr, af_pass_message); /* This is not a security risk */
3057 addr->message = (ob->delay_after_cutoff)?
3058 US"retry time not reached for any host after a long failure period" :
3059 US"all hosts have been failing for a long time and were last tried "
3060 "after this message arrived";
3062 /* If we are already using fallback hosts, or there are no fallback hosts
3063 defined, convert the result to FAIL to cause a bounce. */
3065 if (addr->host_list == addr->fallback_hosts ||
3066 addr->fallback_hosts == NULL)
3067 addr->transport_return = FAIL;
3071 if (hosts_retry == hosts_total)
3072 addr->message = US"retry time not reached for any host";
3073 else if (hosts_fail == hosts_total)
3074 addr->message = US"all host address lookups failed permanently";
3075 else if (hosts_defer == hosts_total)
3076 addr->message = US"all host address lookups failed temporarily";
3077 else if (hosts_serial == hosts_total)
3078 addr->message = US"connection limit reached for all hosts";
3079 else if (hosts_fail+hosts_defer == hosts_total)
3080 addr->message = US"all host address lookups failed";
3081 else addr->message = US"some host address lookups failed and retry time "
3082 "not reached for other hosts or connection limit reached";
3087 /* Update the database which keeps information about which messages are waiting
3088 for which hosts to become available. For some message-specific errors, the
3089 update_waiting flag is turned off because we don't want follow-on deliveries in
3092 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3096 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3098 return TRUE; /* Each address has its status */
3101 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob