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_sni", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, tls_sni) },
135 { "tls_tempfail_tryclear", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
137 { "tls_verify_certificates", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
142 /* Size of the options list. An extern variable has to be used so that its
143 address can appear in the tables drtables.c. */
145 int smtp_transport_options_count =
146 sizeof(smtp_transport_options)/sizeof(optionlist);
148 /* Default private options block for the smtp transport. */
150 smtp_transport_options_block smtp_transport_option_defaults = {
152 NULL, /* fallback_hosts */
154 NULL, /* fallback_hostlist */
155 NULL, /* authenticated_sender */
156 US"$primary_hostname", /* helo_data */
157 NULL, /* interface */
159 US"smtp", /* protocol */
160 NULL, /* serialize_hosts */
161 NULL, /* hosts_try_auth */
162 NULL, /* hosts_require_auth */
163 NULL, /* hosts_require_tls */
164 NULL, /* hosts_avoid_tls */
165 NULL, /* hosts_avoid_pipelining */
166 NULL, /* hosts_avoid_esmtp */
167 NULL, /* hosts_nopass_tls */
168 5*60, /* command_timeout */
169 5*60, /* connect_timeout; shorter system default overrides */
170 5*60, /* data timeout */
171 10*60, /* final timeout */
172 1024, /* size_addition */
173 5, /* hosts_max_try */
174 50, /* hosts_max_try_hardlimit */
175 TRUE, /* address_retry_include_sender */
176 FALSE, /* allow_localhost */
177 FALSE, /* authenticated_sender_force */
178 FALSE, /* gethostbyname */
179 TRUE, /* dns_qualify_single */
180 FALSE, /* dns_search_parents */
181 TRUE, /* delay_after_cutoff */
182 FALSE, /* hosts_override */
183 FALSE, /* hosts_randomize */
184 TRUE, /* keepalive */
185 FALSE, /* lmtp_ignore_quota */
186 TRUE /* retry_include_ip_address */
188 ,NULL, /* tls_certificate */
190 NULL, /* tls_privatekey */
191 NULL, /* tls_require_ciphers */
192 NULL, /* gnutls_require_kx */
193 NULL, /* gnutls_require_mac */
194 NULL, /* gnutls_require_proto */
195 NULL, /* tls_verify_certificates */
196 TRUE, /* tls_tempfail_tryclear */
200 ,NULL, /* dkim_canon */
201 NULL, /* dkim_domain */
202 NULL, /* dkim_private_key */
203 NULL, /* dkim_selector */
204 NULL, /* dkim_sign_headers */
205 NULL /* dkim_strict */
212 static uschar *smtp_command; /* Points to last cmd for error messages */
213 static uschar *mail_command; /* Points to MAIL cmd for error messages */
214 static BOOL update_waiting; /* TRUE to update the "wait" database */
217 /*************************************************
218 * Setup entry point *
219 *************************************************/
221 /* This function is called when the transport is about to be used,
222 but before running it in a sub-process. It is used for two things:
224 (1) To set the fallback host list in addresses, when delivering.
225 (2) To pass back the interface, port, protocol, and other options, for use
226 during callout verification.
229 tblock pointer to the transport instance block
230 addrlist list of addresses about to be transported
231 tf if not NULL, pointer to block in which to return options
232 uid the uid that will be set (not used)
233 gid the gid that will be set (not used)
234 errmsg place for error message (not used)
236 Returns: OK always (FAIL, DEFER not used)
240 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
241 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
243 smtp_transport_options_block *ob =
244 (smtp_transport_options_block *)(tblock->options_block);
246 errmsg = errmsg; /* Keep picky compilers happy */
250 /* Pass back options if required. This interface is getting very messy. */
254 tf->interface = ob->interface;
256 tf->protocol = ob->protocol;
257 tf->hosts = ob->hosts;
258 tf->hosts_override = ob->hosts_override;
259 tf->hosts_randomize = ob->hosts_randomize;
260 tf->gethostbyname = ob->gethostbyname;
261 tf->qualify_single = ob->dns_qualify_single;
262 tf->search_parents = ob->dns_search_parents;
263 tf->helo_data = ob->helo_data;
266 /* Set the fallback host list for all the addresses that don't have fallback
267 host lists, provided that the local host wasn't present in the original host
270 if (!testflag(addrlist, af_local_host_removed))
272 for (; addrlist != NULL; addrlist = addrlist->next)
273 if (addrlist->fallback_hosts == NULL)
274 addrlist->fallback_hosts = ob->fallback_hostlist;
282 /*************************************************
283 * Initialization entry point *
284 *************************************************/
286 /* Called for each instance, after its options have been read, to
287 enable consistency checks to be done, or anything else that needs
290 Argument: pointer to the transport instance block
295 smtp_transport_init(transport_instance *tblock)
297 smtp_transport_options_block *ob =
298 (smtp_transport_options_block *)(tblock->options_block);
300 /* Retry_use_local_part defaults FALSE if unset */
302 if (tblock->retry_use_local_part == TRUE_UNSET)
303 tblock->retry_use_local_part = FALSE;
305 /* Set the default port according to the protocol */
307 if (ob->port == NULL)
308 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
309 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
311 /* Set up the setup entry point, to be called before subprocesses for this
314 tblock->setup = smtp_transport_setup;
316 /* Complain if any of the timeouts are zero. */
318 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
319 ob->final_timeout <= 0)
320 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
321 "command, data, or final timeout value is zero for %s transport",
324 /* If hosts_override is set and there are local hosts, set the global
325 flag that stops verify from showing router hosts. */
327 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
329 /* If there are any fallback hosts listed, build a chain of host items
330 for them, but do not do any lookups at this time. */
332 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
339 /*************************************************
340 * Set delivery info into all active addresses *
341 *************************************************/
343 /* Only addresses whose status is >= PENDING are relevant. A lesser
344 status means that an address is not currently being processed.
347 addrlist points to a chain of addresses
348 errno_value to put in each address's errno field
349 msg to put in each address's message field
350 rc to put in each address's transport_return field
351 pass_message if TRUE, set the "pass message" flag in the address
353 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
354 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
355 this particular type of timeout.
361 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
366 if (errno_value == ERRNO_CONNECTTIMEOUT)
368 errno_value = ETIMEDOUT;
369 orvalue = RTEF_CTOUT;
371 for (addr = addrlist; addr != NULL; addr = addr->next)
373 if (addr->transport_return < PENDING) continue;
374 addr->basic_errno = errno_value;
375 addr->more_errno |= orvalue;
379 if (pass_message) setflag(addr, af_pass_message);
381 addr->transport_return = rc;
387 /*************************************************
388 * Check an SMTP response *
389 *************************************************/
391 /* This function is given an errno code and the SMTP response buffer
392 to analyse, together with the host identification for generating messages. It
393 sets an appropriate message and puts the first digit of the response code into
394 the yield variable. If no response was actually read, a suitable digit is
398 host the current host, to get its name for messages
399 errno_value pointer to the errno value
400 more_errno from the top address for use with ERRNO_FILTER_FAIL
401 buffer the SMTP response buffer
402 yield where to put a one-digit SMTP response code
403 message where to put an errror message
404 pass_message set TRUE if message is an SMTP response
406 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
409 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
410 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
414 if (smtp_use_pipelining &&
415 (Ustrcmp(smtp_command, "MAIL") == 0 ||
416 Ustrcmp(smtp_command, "RCPT") == 0 ||
417 Ustrcmp(smtp_command, "DATA") == 0))
420 *yield = '4'; /* Default setting is to give a temporary error */
422 /* Handle response timeout */
424 if (*errno_value == ETIMEDOUT)
426 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
427 "after %s%s", host->name, host->address, pl, smtp_command);
428 if (transport_count > 0)
429 *message = US string_sprintf("%s (%d bytes written)", *message,
434 /* Handle malformed SMTP response */
436 if (*errno_value == ERRNO_SMTPFORMAT)
438 uschar *malfresp = string_printing(buffer);
439 while (isspace(*malfresp)) malfresp++;
441 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
442 "%s [%s] in response to %s%s", host->name, host->address, pl,
445 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
446 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
450 /* Handle a failed filter process error; can't send QUIT as we mustn't
453 if (*errno_value == ERRNO_FILTER_FAIL)
455 *message = US string_sprintf("transport filter process failed (%d)%s",
457 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
461 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
464 if (*errno_value == ERRNO_CHHEADER_FAIL)
467 US string_sprintf("failed to expand headers_add or headers_remove: %s",
468 expand_string_message);
472 /* Handle failure to write a complete data block */
474 if (*errno_value == ERRNO_WRITEINCOMPLETE)
476 *message = US string_sprintf("failed to write a data block");
480 /* Handle error responses from the remote mailer. */
484 uschar *s = string_printing(buffer);
485 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
486 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
487 *pass_message = TRUE;
492 /* No data was read. If there is no errno, this must be the EOF (i.e.
493 connection closed) case, which causes deferral. An explicit connection reset
494 error has the same effect. Otherwise, put the host's identity in the message,
495 leaving the errno value to be interpreted as well. In all cases, we have to
496 assume the connection is now dead. */
498 if (*errno_value == 0 || *errno_value == ECONNRESET)
500 *errno_value = ERRNO_SMTPCLOSED;
501 *message = US string_sprintf("Remote host %s [%s] closed connection "
502 "in response to %s%s", host->name, host->address, pl, smtp_command);
504 else *message = US string_sprintf("%s [%s]", host->name, host->address);
511 /*************************************************
512 * Write error message to logs *
513 *************************************************/
515 /* This writes to the main log and to the message log.
518 addr the address item containing error information
519 host the current host
525 write_logs(address_item *addr, host_item *host)
527 if (addr->message != NULL)
529 uschar *message = addr->message;
530 if (addr->basic_errno > 0)
531 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
532 log_write(0, LOG_MAIN, "%s", message);
533 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
538 ((log_extra_selector & LX_outgoing_port) != 0)?
539 string_sprintf("%s [%s]:%d", host->name, host->address,
540 (host->port == PORT_NONE)? 25 : host->port)
542 string_sprintf("%s [%s]", host->name, host->address);
543 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
544 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
545 strerror(addr->basic_errno));
551 /*************************************************
552 * Synchronize SMTP responses *
553 *************************************************/
555 /* This function is called from smtp_deliver() to receive SMTP responses from
556 the server, and match them up with the commands to which they relate. When
557 PIPELINING is not in use, this function is called after every command, and is
558 therefore somewhat over-engineered, but it is simpler to use a single scheme
559 that works both with and without PIPELINING instead of having two separate sets
562 The set of commands that are buffered up with pipelining may start with MAIL
563 and may end with DATA; in between are RCPT commands that correspond to the
564 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
565 etc.) are never buffered.
567 Errors after MAIL or DATA abort the whole process leaving the response in the
568 buffer. After MAIL, pending responses are flushed, and the original command is
569 re-instated in big_buffer for error messages. For RCPT commands, the remote is
570 permitted to reject some recipient addresses while accepting others. However
571 certain errors clearly abort the whole process. Set the value in
572 transport_return to PENDING_OK if the address is accepted. If there is a
573 subsequent general error, it will get reset accordingly. If not, it will get
574 converted to OK at the end.
577 addrlist the complete address list
578 include_affixes TRUE if affixes include in RCPT
579 sync_addr ptr to the ptr of the one to start scanning at (updated)
580 host the host we are connected to
581 count the number of responses to read
583 include_sender true if 4xx retry is to include the sender it its key
584 pending_MAIL true if the first response is for MAIL
585 pending_DATA 0 if last command sent was not DATA
586 +1 if previously had a good recipient
587 -1 if not previously had a good recipient
588 inblock incoming SMTP block
589 timeout timeout value
590 buffer buffer for reading response
591 buffsize size of buffer
593 Returns: 3 if at least one address had 2xx and one had 5xx
594 2 if at least one address had 5xx but none had 2xx
595 1 if at least one host had a 2xx response, but none had 5xx
596 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
597 -1 timeout while reading RCPT response
598 -2 I/O or other non-response error for RCPT
599 -3 DATA or MAIL failed - errno and buffer set
603 sync_responses(address_item *addrlist, BOOL include_affixes,
604 address_item **sync_addr, host_item *host, int count,
605 BOOL address_retry_include_sender, BOOL pending_MAIL,
606 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
609 address_item *addr = *sync_addr;
612 /* Handle the response for a MAIL command. On error, reinstate the original
613 command in big_buffer for error message use, and flush any further pending
614 responses before returning, except after I/O errors and timeouts. */
619 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
621 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
622 if (errno == 0 && buffer[0] != 0)
624 uschar flushbuffer[4096];
626 if (buffer[0] == '4')
628 save_errno = ERRNO_MAIL4XX;
629 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
633 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
635 && (errno != 0 || flushbuffer[0] == 0))
644 if (pending_DATA) count--; /* Number of RCPT responses to come */
646 /* Read and handle the required number of RCPT responses, matching each one up
647 with an address by scanning for the next address whose status is PENDING_DEFER.
652 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
654 /* The address was accepted */
656 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
659 addr->transport_return = PENDING_OK;
661 /* If af_dr_retry_exists is set, there was a routing delay on this address;
662 ensure that any address-specific retry record is expunged. We do this both
663 for the basic key and for the version that also includes the sender. */
665 if (testflag(addr, af_dr_retry_exists))
667 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
669 retry_add_item(addr, altkey, rf_delete);
670 retry_add_item(addr, addr->address_retry_key, rf_delete);
674 /* Timeout while reading the response */
676 else if (errno == ETIMEDOUT)
678 int save_errno = errno;
679 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
680 "after RCPT TO:<%s>", host->name, host->address,
681 transport_rcpt_address(addr, include_affixes));
682 set_errno(addrlist, save_errno, message, DEFER, FALSE);
683 retry_add_item(addr, addr->address_retry_key, 0);
684 update_waiting = FALSE;
688 /* Handle other errors in obtaining an SMTP response by returning -1. This
689 will cause all the addresses to be deferred. Restore the SMTP command in
690 big_buffer for which we are checking the response, so the error message
693 else if (errno != 0 || buffer[0] == 0)
695 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
696 transport_rcpt_address(addr, include_affixes));
700 /* Handle SMTP permanent and temporary response codes. */
705 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
706 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
707 host->name, host->address, string_printing(buffer));
708 setflag(addr, af_pass_message);
709 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
711 /* The response was 5xx */
713 if (buffer[0] == '5')
715 addr->transport_return = FAIL;
719 /* The response was 4xx */
723 addr->transport_return = DEFER;
724 addr->basic_errno = ERRNO_RCPT4XX;
725 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
727 /* Log temporary errors if there are more hosts to be tried. */
729 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
731 /* Do not put this message on the list of those waiting for specific
732 hosts, as otherwise it is likely to be tried too often. */
734 update_waiting = FALSE;
736 /* Add a retry item for the address so that it doesn't get tried again
737 too soon. If address_retry_include_sender is true, add the sender address
740 if (address_retry_include_sender)
742 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
744 retry_add_item(addr, altkey, 0);
746 else retry_add_item(addr, addr->address_retry_key, 0);
749 } /* Loop for next RCPT response */
751 /* Update where to start at for the next block of responses, unless we
752 have already handled all the addresses. */
754 if (addr != NULL) *sync_addr = addr->next;
756 /* Handle a response to DATA. If we have not had any good recipients, either
757 previously or in this block, the response is ignored. */
759 if (pending_DATA != 0 &&
760 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
765 if (pending_DATA > 0 || (yield & 1) != 0)
767 if (errno == 0 && buffer[0] == '4')
769 errno = ERRNO_DATA4XX;
770 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
774 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
775 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
776 "is in use and there were no good recipients\n", msg);
779 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
780 present) received 3xx. If any RCPTs were handled and yielded anything other
781 than 4xx, yield will be set non-zero. */
788 /*************************************************
789 * Deliver address list to given host *
790 *************************************************/
792 /* If continue_hostname is not null, we get here only when continuing to
793 deliver down an existing channel. The channel was passed as the standard
794 input. TLS is never active on a passed channel; the previous process always
795 closes it down before passing the connection on.
797 Otherwise, we have to make a connection to the remote host, and do the
798 initial protocol exchange.
800 When running as an MUA wrapper, if the sender or any recipient is rejected,
801 temporarily or permanently, we force failure for all recipients.
804 addrlist chain of potential addresses to deliver; only those whose
805 transport_return field is set to PENDING_DEFER are currently
806 being processed; others should be skipped - they have either
807 been delivered to an earlier host or IP address, or been
808 failed by one of them.
809 host host to deliver to
810 host_af AF_INET or AF_INET6
811 port default TCP/IP port to use, in host byte order
812 interface interface to bind to, or NULL
813 tblock transport instance block
814 copy_host TRUE if host set in addr->host_used must be copied, because
815 it is specific to this call of the transport
816 message_defer set TRUE if yield is OK, but all addresses were deferred
817 because of a non-recipient, non-host failure, that is, a
818 4xx response to MAIL FROM, DATA, or ".". This is a defer
819 that is specific to the message.
820 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
821 a second attempt after TLS initialization fails
823 Returns: OK - the connection was made and the delivery attempted;
824 the result for each address is in its data block.
825 DEFER - the connection could not be made, or something failed
826 while setting up the SMTP session, or there was a
827 non-message-specific error, such as a timeout.
828 ERROR - a filter command is specified for this transport,
829 and there was a problem setting it up; OR helo_data
830 or add_headers or authenticated_sender is specified
831 for this transport, and the string failed to expand
835 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
836 uschar *interface, transport_instance *tblock, BOOL copy_host,
837 BOOL *message_defer, BOOL suppress_tls)
840 address_item *sync_addr;
841 address_item *first_addr = addrlist;
846 time_t start_delivery_time = time(NULL);
847 smtp_transport_options_block *ob =
848 (smtp_transport_options_block *)(tblock->options_block);
849 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
850 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
852 BOOL send_rset = TRUE;
853 BOOL send_quit = TRUE;
854 BOOL setting_up = TRUE;
855 BOOL completed_address = FALSE;
858 BOOL pass_message = FALSE;
859 smtp_inblock inblock;
860 smtp_outblock outblock;
861 int max_rcpt = tblock->max_addresses;
862 uschar *igquotstr = US"";
863 uschar *local_authenticated_sender = authenticated_sender;
864 uschar *helo_data = NULL;
865 uschar *message = NULL;
866 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
869 uschar inbuffer[4096];
870 uschar outbuffer[1024];
872 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
874 *message_defer = FALSE;
875 smtp_command = US"initial connection";
876 if (max_rcpt == 0) max_rcpt = 999999;
878 /* Set up the buffer for reading SMTP response packets. */
880 inblock.buffer = inbuffer;
881 inblock.buffersize = sizeof(inbuffer);
882 inblock.ptr = inbuffer;
883 inblock.ptrend = inbuffer;
885 /* Set up the buffer for holding SMTP commands while pipelining */
887 outblock.buffer = outbuffer;
888 outblock.buffersize = sizeof(outbuffer);
889 outblock.ptr = outbuffer;
890 outblock.cmd_count = 0;
891 outblock.authenticating = FALSE;
893 /* Reset the parameters of a TLS session. */
898 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
902 /* If an authenticated_sender override has been specified for this transport
903 instance, expand it. If the expansion is forced to fail, and there was already
904 an authenticated_sender for this message, the original value will be used.
905 Other expansion failures are serious. An empty result is ignored, but there is
906 otherwise no check - this feature is expected to be used with LMTP and other
907 cases where non-standard addresses (e.g. without domains) might be required. */
909 if (ob->authenticated_sender != NULL)
911 uschar *new = expand_string(ob->authenticated_sender);
914 if (!expand_string_forcedfail)
916 uschar *message = string_sprintf("failed to expand "
917 "authenticated_sender: %s", expand_string_message);
918 set_errno(addrlist, 0, message, DEFER, FALSE);
922 else if (new[0] != 0) local_authenticated_sender = new;
928 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
933 /* Make a connection to the host if this isn't a continued delivery, and handle
934 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
935 specially so they can be identified for retries. */
937 if (continue_hostname == NULL)
939 inblock.sock = outblock.sock =
940 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
941 ob->keepalive); /* This puts port into host->port */
943 if (inblock.sock < 0)
945 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
950 /* Expand the greeting message while waiting for the initial response. (Makes
951 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
952 delayed till here so that $sending_interface and $sending_port are set. */
954 helo_data = expand_string(ob->helo_data);
956 /* The first thing is to wait for an initial OK response. The dreaded "goto"
957 is nevertheless a reasonably clean way of programming this kind of logic,
958 where you want to escape on any error. */
962 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
963 ob->command_timeout)) goto RESPONSE_FAILED;
965 /* Now check if the helo_data expansion went well, and sign off cleanly if
968 if (helo_data == NULL)
970 uschar *message = string_sprintf("failed to expand helo_data: %s",
971 expand_string_message);
972 set_errno(addrlist, 0, message, DEFER, FALSE);
978 /** Debugging without sending a message
979 addrlist->transport_return = DEFER;
983 /* Errors that occur after this point follow an SMTP command, which is
984 left in big_buffer by smtp_write_command() for use in error messages. */
986 smtp_command = big_buffer;
988 /* Tell the remote who we are...
990 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
991 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
992 greeting is of this form. The assumption was that the far end supports it
993 properly... but experience shows that there are some that give 5xx responses,
994 even though the banner includes "ESMTP" (there's a bloody-minded one that
995 says "ESMTP not spoken here"). Cope with that case.
997 September 2000: Time has passed, and it seems reasonable now to always send
998 EHLO at the start. It is also convenient to make the change while installing
1001 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1002 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1003 would be no way to send out the mails, so there is now a host list
1004 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1005 PIPELINING problem as well. Maybe it can also be useful to cure other
1006 problems with broken servers.
1008 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1009 Then somebody tried it with a Microsoft mailer... It seems that all other
1010 mailers use upper case for some reason (the RFC is quite clear about case
1011 independence) so, for peace of mind, I gave in. */
1013 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1014 host->name, host->address, NULL) != OK;
1016 /* Alas; be careful, since this goto is not an error-out, so conceivably
1017 we might set data between here and the target which we assume to exist
1018 and be usable. I can see this coming back to bite us. */
1023 suppress_tls = FALSE;
1024 ob->tls_tempfail_tryclear = FALSE;
1025 smtp_command = US"SSL-on-connect";
1032 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1033 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1035 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1036 ob->command_timeout))
1038 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1045 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1050 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1052 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1053 ob->command_timeout)) goto RESPONSE_FAILED;
1056 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1057 lmtp_ignore_quota option was set. */
1059 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1060 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1061 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1063 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1066 tls_offered = esmtp &&
1067 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1068 PCRE_EOPT, NULL, 0) >= 0;
1072 /* For continuing deliveries down the same channel, the socket is the standard
1073 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1074 below). Set up the pointer to where subsequent commands will be left, for
1075 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1076 set from the command line if they were set in the process that passed the
1081 inblock.sock = outblock.sock = fileno(stdin);
1082 smtp_command = big_buffer;
1083 host->port = port; /* Record the port that was used */
1086 /* If TLS is available on this connection, whether continued or not, attempt to
1087 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1088 send another EHLO - the server may give a different answer in secure mode. We
1089 use a separate buffer for reading the response to STARTTLS so that if it is
1090 negative, the original EHLO data is available for subsequent analysis, should
1091 the client not be required to use TLS. If the response is bad, copy the buffer
1092 for error analysis. */
1095 if (tls_offered && !suppress_tls &&
1096 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1097 host->address, NULL) != OK)
1099 uschar buffer2[4096];
1100 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1103 /* If there is an I/O error, transmission of this message is deferred. If
1104 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1105 false, we also defer. However, if there is a temporary rejection of STARTTLS
1106 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1107 STARTTLS, we carry on. This means we will try to send the message in clear,
1108 unless the host is in hosts_require_tls (tested below). */
1110 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1111 ob->command_timeout))
1113 if (errno != 0 || buffer2[0] == 0 ||
1114 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1116 Ustrncpy(buffer, buffer2, sizeof(buffer));
1117 goto RESPONSE_FAILED;
1121 /* STARTTLS accepted: try to negotiate a TLS session. */
1126 int rc = tls_client_start(inblock.sock,
1129 NULL, /* No DH param */
1130 ob->tls_certificate,
1133 ob->tls_verify_certificates,
1135 ob->tls_require_ciphers,
1136 ob->gnutls_require_mac,
1137 ob->gnutls_require_kx,
1138 ob->gnutls_require_proto,
1139 ob->command_timeout);
1141 /* TLS negotiation failed; give an error. From outside, this function may
1142 be called again to try in clear on a new connection, if the options permit
1143 it for this host. */
1147 save_errno = ERRNO_TLSFAILURE;
1148 message = US"failure while setting up TLS session";
1153 /* TLS session is set up */
1155 for (addr = addrlist; addr != NULL; addr = addr->next)
1157 if (addr->transport_return == PENDING_DEFER)
1159 addr->cipher = tls_cipher;
1160 addr->peerdn = tls_peerdn;
1166 /* if smtps, we'll have smtp_command set to something else; always safe to
1168 smtp_command = big_buffer;
1170 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1171 helo_data is null, we are dealing with a connection that was passed from
1172 another process, and so we won't have expanded helo_data above. We have to
1173 expand it here. $sending_ip_address and $sending_port are set up right at the
1174 start of the Exim process (in exim.c). */
1176 if (tls_active >= 0)
1179 if (helo_data == NULL)
1181 helo_data = expand_string(ob->helo_data);
1182 if (helo_data == NULL)
1184 uschar *message = string_sprintf("failed to expand helo_data: %s",
1185 expand_string_message);
1186 set_errno(addrlist, 0, message, DEFER, FALSE);
1192 /* For SMTPS we need to wait for the initial OK response. */
1195 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1196 ob->command_timeout)) goto RESPONSE_FAILED;
1200 greeting_cmd = "EHLO";
1203 greeting_cmd = "HELO";
1205 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1208 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1209 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1211 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1212 ob->command_timeout))
1213 goto RESPONSE_FAILED;
1216 /* If the host is required to use a secure channel, ensure that we
1219 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1220 host->address, NULL) == OK)
1222 save_errno = ERRNO_TLSREQUIRED;
1223 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1224 host->name, host->address,
1225 tls_offered? "an attempt to start TLS failed" :
1226 "the server did not offer TLS support");
1231 /* If TLS is active, we have just started it up and re-done the EHLO command,
1232 so its response needs to be analyzed. If TLS is not active and this is a
1233 continued session down a previously-used socket, we haven't just done EHLO, so
1236 if (continue_hostname == NULL
1243 uschar *fail_reason = US"server did not advertise AUTH support";
1245 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1246 lmtp_ignore_quota option was set. */
1248 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1249 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1250 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1252 /* If the response to EHLO specified support for the SIZE parameter, note
1253 this, provided size_addition is non-negative. */
1255 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1256 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1257 PCRE_EOPT, NULL, 0) >= 0;
1259 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1260 the current host, esmtp will be false, so PIPELINING can never be used. If
1261 the current host matches hosts_avoid_pipelining, don't do it. */
1263 smtp_use_pipelining = esmtp &&
1264 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1265 host->address, NULL) != OK &&
1266 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1267 PCRE_EOPT, NULL, 0) >= 0;
1269 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1270 smtp_use_pipelining? "" : "not ");
1272 /* Note if the response to EHLO specifies support for the AUTH extension.
1273 If it has, check that this host is one we want to authenticate to, and do
1274 the business. The host name and address must be available when the
1275 authenticator's client driver is running. */
1277 smtp_authenticated = FALSE;
1278 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1279 host->name, host->address, NULL);
1281 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1283 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1284 expand_nmax = -1; /* reset */
1286 /* Must not do this check until after we have saved the result of the
1287 regex match above. */
1289 if (require_auth == OK ||
1290 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1291 host->address, NULL) == OK)
1294 fail_reason = US"no common mechanisms were found";
1296 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1298 /* Scan the configured authenticators looking for one which is configured
1299 for use as a client, which is not suppressed by client_condition, and
1300 whose name matches an authentication mechanism supported by the server.
1301 If one is found, attempt to authenticate by calling its client function.
1304 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1308 (au->client_condition != NULL &&
1309 !expand_check_condition(au->client_condition, au->name,
1310 US"client authenticator")))
1312 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1314 (au->client)? "client_condition is false" :
1315 "not configured as a client");
1319 /* Loop to scan supported server mechanisms */
1324 int len = Ustrlen(au->public_name);
1325 while (isspace(*p)) p++;
1327 if (strncmpic(au->public_name, p, len) != 0 ||
1328 (p[len] != 0 && !isspace(p[len])))
1330 while (*p != 0 && !isspace(*p)) p++;
1334 /* Found data for a listed mechanism. Call its client entry. Set
1335 a flag in the outblock so that data is overwritten after sending so
1336 that reflections don't show it. */
1338 fail_reason = US"authentication attempt(s) failed";
1339 outblock.authenticating = TRUE;
1340 rc = (au->info->clientcode)(au, &inblock, &outblock,
1341 ob->command_timeout, buffer, sizeof(buffer));
1342 outblock.authenticating = FALSE;
1343 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1346 /* A temporary authentication failure must hold up delivery to
1347 this host. After a permanent authentication failure, we carry on
1348 to try other authentication methods. If all fail hard, try to
1349 deliver the message unauthenticated unless require_auth was set. */
1354 smtp_authenticated = TRUE; /* stops the outer loop */
1357 /* Failure after writing a command */
1362 /* Failure after reading a response */
1365 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1366 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1367 au->name, host->name, host->address, buffer);
1370 /* Failure by some other means. In effect, the authenticator
1371 decided it wasn't prepared to handle this case. Typically this
1372 is the result of "fail" in an expansion string. Do we need to
1373 log anything here? Feb 2006: a message is now put in the buffer
1374 if logging is required. */
1378 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1379 "authentication H=%s [%s] %s", au->name, host->name,
1380 host->address, buffer);
1383 /* Internal problem, message in buffer. */
1387 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1391 break; /* If not authenticated, try next authenticator */
1392 } /* Loop for scanning supported server mechanisms */
1393 } /* Loop for further authenticators */
1397 /* If we haven't authenticated, but are required to, give up. */
1399 if (require_auth == OK && !smtp_authenticated)
1402 set_errno(addrlist, ERRNO_AUTHFAIL,
1403 string_sprintf("authentication required but %s", fail_reason), DEFER,
1409 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1410 message-specific. */
1414 /* If there is a filter command specified for this transport, we can now
1415 set it up. This cannot be done until the identify of the host is known. */
1417 if (tblock->filter_command != NULL)
1421 sprintf(CS buffer, "%.50s transport", tblock->name);
1422 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1423 TRUE, DEFER, addrlist, buffer, NULL);
1424 transport_filter_timeout = tblock->filter_timeout;
1426 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1431 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1439 /* For messages that have more than the maximum number of envelope recipients,
1440 we want to send several transactions down the same SMTP connection. (See
1441 comments in deliver.c as to how this reconciles, heuristically, with
1442 remote_max_parallel.) This optimization was added to Exim after the following
1443 code was already working. The simplest way to put it in without disturbing the
1444 code was to use a goto to jump back to this point when there is another
1445 transaction to handle. */
1448 sync_addr = first_addr;
1452 completed_address = FALSE;
1455 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1456 qualification, send it, adding something to the message size to allow for
1457 imprecision and things that get added en route. Exim keeps the number of lines
1458 in a message, so we can give an accurate value for the original message, but we
1459 need some additional to handle added headers. (Double "." characters don't get
1460 included in the count.) */
1467 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1471 /* Add the authenticated sender address if present */
1473 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1474 local_authenticated_sender != NULL)
1476 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1477 auth_xtextencode(local_authenticated_sender,
1478 Ustrlen(local_authenticated_sender)));
1481 /* From here until we send the DATA command, we can make use of PIPELINING
1482 if the server host supports it. The code has to be able to check the responses
1483 at any point, for when the buffer fills up, so we write it totally generally.
1484 When PIPELINING is off, each command written reports that it has flushed the
1487 pending_MAIL = TRUE; /* The block starts with MAIL */
1489 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1490 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1491 mail_command = string_copy(big_buffer); /* Save for later error message */
1495 case -1: /* Transmission error */
1498 case +1: /* Block was sent */
1499 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1500 ob->command_timeout))
1502 if (errno == 0 && buffer[0] == '4')
1504 errno = ERRNO_MAIL4XX;
1505 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1507 goto RESPONSE_FAILED;
1509 pending_MAIL = FALSE;
1513 /* Pass over all the relevant recipient addresses for this host, which are the
1514 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1515 several before we have to read the responses for those seen so far. This
1516 checking is done by a subroutine because it also needs to be done at the end.
1517 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1518 the next one if not all are sent.
1520 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1521 last address because we want to abort if any recipients have any kind of
1522 problem, temporary or permanent. We know that all recipient addresses will have
1523 the PENDING_DEFER status, because only one attempt is ever made, and we know
1524 that max_rcpt will be large, so all addresses will be done at once. */
1526 for (addr = first_addr;
1527 address_count < max_rcpt && addr != NULL;
1533 if (addr->transport_return != PENDING_DEFER) continue;
1536 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1538 /* Now send the RCPT command, and process outstanding responses when
1539 necessary. After a timeout on RCPT, we just end the function, leaving the
1540 yield as OK, because this error can often mean that there is a problem with
1541 just one address, so we don't want to delay the host. */
1543 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1544 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1545 if (count < 0) goto SEND_FAILED;
1548 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1549 &sync_addr, host, count, ob->address_retry_include_sender,
1550 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1553 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1554 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1557 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1558 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1559 case 0: /* No 2xx or 5xx, but no probs */
1562 case -1: goto END_OFF; /* Timeout on RCPT */
1563 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1565 pending_MAIL = FALSE; /* Dealt with MAIL */
1567 } /* Loop for next address */
1569 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1570 permanently or temporarily. We should have flushed and synced after the last
1575 address_item *badaddr;
1576 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1578 if (badaddr->transport_return != PENDING_OK) break;
1580 if (badaddr != NULL)
1582 set_errno(addrlist, 0, badaddr->message, FAIL,
1583 testflag(badaddr, af_pass_message));
1588 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1589 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1590 have a good recipient buffered up if we are pipelining. We don't want to waste
1591 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1592 are pipelining. The responses are all handled by sync_responses(). */
1594 if (ok || (smtp_use_pipelining && !mua_wrapper))
1596 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1597 if (count < 0) goto SEND_FAILED;
1598 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1599 host, count, ob->address_retry_include_sender, pending_MAIL,
1600 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1602 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1603 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1606 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1607 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1608 case 0: break; /* No 2xx or 5xx, but no probs */
1610 case -1: goto END_OFF; /* Timeout on RCPT */
1611 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1615 /* Save the first address of the next batch. */
1619 /* If there were no good recipients (but otherwise there have been no
1620 problems), just set ok TRUE, since we have handled address-specific errors
1621 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1622 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1623 well as body. Set the appropriate timeout value to be used for each chunk.
1624 (Haven't been able to make it work using select() for writing yet.) */
1626 if (!ok) ok = TRUE; else
1628 sigalrm_seen = FALSE;
1629 transport_write_timeout = ob->data_timeout;
1630 smtp_command = US"sending data block"; /* For error messages */
1631 DEBUG(D_transport|D_v)
1632 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1633 transport_count = 0;
1634 #ifndef DISABLE_DKIM
1635 ok = dkim_transport_write_message(addrlist, inblock.sock,
1636 topt_use_crlf | topt_end_dot | topt_escape_headers |
1637 (tblock->body_only? topt_no_headers : 0) |
1638 (tblock->headers_only? topt_no_body : 0) |
1639 (tblock->return_path_add? topt_add_return_path : 0) |
1640 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1641 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1642 0, /* No size limit */
1643 tblock->add_headers, tblock->remove_headers,
1644 US".", US"..", /* Escaping strings */
1645 tblock->rewrite_rules, tblock->rewrite_existflags,
1646 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1647 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1650 ok = transport_write_message(addrlist, inblock.sock,
1651 topt_use_crlf | topt_end_dot | topt_escape_headers |
1652 (tblock->body_only? topt_no_headers : 0) |
1653 (tblock->headers_only? topt_no_body : 0) |
1654 (tblock->return_path_add? topt_add_return_path : 0) |
1655 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1656 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1657 0, /* No size limit */
1658 tblock->add_headers, tblock->remove_headers,
1659 US".", US"..", /* Escaping strings */
1660 tblock->rewrite_rules, tblock->rewrite_existflags);
1663 /* transport_write_message() uses write() because it is called from other
1664 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1665 it can exit with "Broken pipe" as its error. This really means that the
1666 socket got closed at the far end. */
1668 transport_write_timeout = 0; /* for subsequent transports */
1670 /* Failure can either be some kind of I/O disaster (including timeout),
1671 or the failure of a transport filter or the expansion of added headers. */
1675 buffer[0] = 0; /* There hasn't been a response */
1676 goto RESPONSE_FAILED;
1679 /* We used to send the terminating "." explicitly here, but because of
1680 buffering effects at both ends of TCP/IP connections, you don't gain
1681 anything by keeping it separate, so it might as well go in the final
1682 data buffer for efficiency. This is now done by setting the topt_end_dot
1685 smtp_command = US"end of data";
1687 /* For SMTP, we now read a single response that applies to the whole message.
1688 If it is OK, then all the addresses have been delivered. */
1692 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1694 if (!ok && errno == 0 && buffer[0] == '4')
1696 errno = ERRNO_DATA4XX;
1697 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1701 /* For LMTP, we get back a response for every RCPT command that we sent;
1702 some may be accepted and some rejected. For those that get a response, their
1703 status is fixed; any that are accepted have been handed over, even if later
1704 responses crash - at least, that's how I read RFC 2033.
1706 If all went well, mark the recipient addresses as completed, record which
1707 host/IPaddress they were delivered to, and cut out RSET when sending another
1708 message down the same channel. Write the completed addresses to the journal
1709 now so that they are recorded in case there is a crash of hardware or
1710 software before the spool gets updated. Also record the final SMTP
1711 confirmation if needed (for SMTP only). */
1716 int delivery_time = (int)(time(NULL) - start_delivery_time);
1719 uschar *conf = NULL;
1722 /* Make a copy of the host if it is local to this invocation
1723 of the transport. */
1727 thost = store_get(sizeof(host_item));
1729 thost->name = string_copy(host->name);
1730 thost->address = string_copy(host->address);
1734 /* Set up confirmation if needed - applies only to SMTP */
1736 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1738 uschar *s = string_printing(buffer);
1739 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1742 /* Process all transported addresses - for LMTP, read a status for
1745 for (addr = addrlist; addr != first_addr; addr = addr->next)
1747 if (addr->transport_return != PENDING_OK) continue;
1749 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1750 remaining addresses. Otherwise, it's a return code for just the one
1751 address. For temporary errors, add a retry item for the address so that
1752 it doesn't get tried again too soon. */
1756 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1759 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1760 addr->message = string_sprintf("LMTP error after %s: %s",
1761 big_buffer, string_printing(buffer));
1762 setflag(addr, af_pass_message); /* Allow message to go to user */
1763 if (buffer[0] == '5')
1764 addr->transport_return = FAIL;
1767 errno = ERRNO_DATA4XX;
1768 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1769 addr->transport_return = DEFER;
1770 retry_add_item(addr, addr->address_retry_key, 0);
1774 completed_address = TRUE; /* NOW we can set this flag */
1775 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1777 uschar *s = string_printing(buffer);
1778 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1782 /* SMTP, or success return from LMTP for this address. Pass back the
1783 actual host that was used. */
1785 addr->transport_return = OK;
1786 addr->more_errno = delivery_time;
1787 addr->host_used = thost;
1788 addr->special_action = flag;
1789 addr->message = conf;
1792 /* Update the journal. For homonymic addresses, use the base address plus
1793 the transport name. See lots of comments in deliver.c about the reasons
1794 for the complications when homonyms are involved. Just carry on after
1795 write error, as it may prove possible to update the spool file later. */
1797 if (testflag(addr, af_homonym))
1798 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1800 sprintf(CS buffer, "%.500s\n", addr->unique);
1802 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1803 len = Ustrlen(CS buffer);
1804 if (write(journal_fd, buffer, len) != len)
1805 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1806 "%s: %s", buffer, strerror(errno));
1809 /* Ensure the journal file is pushed out to disk. */
1811 if (EXIMfsync(journal_fd) < 0)
1812 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1818 /* Handle general (not specific to one address) failures here. The value of ok
1819 is used to skip over this code on the falling through case. A timeout causes a
1820 deferral. Other errors may defer or fail according to the response code, and
1821 may set up a special errno value, e.g. after connection chopped, which is
1822 assumed if errno == 0 and there is no text in the buffer. If control reaches
1823 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1824 the problem is not related to this specific message. */
1833 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1834 buffer, &code, &message, &pass_message);
1840 message = US string_sprintf("send() to %s [%s] failed: %s",
1841 host->name, host->address, strerror(save_errno));
1845 /* This label is jumped to directly when a TLS negotiation has failed,
1846 or was not done for a host for which it is required. Values will be set
1847 in message and save_errno, and setting_up will always be true. Treat as
1848 a temporary error. */
1855 /* If the failure happened while setting up the call, see if the failure was
1856 a 5xx response (this will either be on connection, or following HELO - a 5xx
1857 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1858 never going to accept them. For other errors during setting up (timeouts or
1859 whatever), defer all addresses, and yield DEFER, so that the host is not
1860 tried again for a while. */
1863 ok = FALSE; /* For when reached by GOTO */
1869 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1873 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1878 /* We want to handle timeouts after MAIL or "." and loss of connection after
1879 "." specially. They can indicate a problem with the sender address or with
1880 the contents of the message rather than a real error on the connection. These
1881 cases are treated in the same way as a 4xx response. This next bit of code
1882 does the classification. */
1893 message_error = TRUE;
1897 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1898 Ustrncmp(smtp_command,"end ",4) == 0;
1901 case ERRNO_SMTPCLOSED:
1902 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1906 message_error = FALSE;
1910 /* Handle the cases that are treated as message errors. These are:
1912 (a) negative response or timeout after MAIL
1913 (b) negative response after DATA
1914 (c) negative response or timeout or dropped connection after "."
1916 It won't be a negative response or timeout after RCPT, as that is dealt
1917 with separately above. The action in all cases is to set an appropriate
1918 error code for all the addresses, but to leave yield set to OK because the
1919 host itself has not failed. Of course, it might in practice have failed
1920 when we've had a timeout, but if so, we'll discover that at the next
1921 delivery attempt. For a temporary error, set the message_defer flag, and
1922 write to the logs for information if this is not the last host. The error
1923 for the last host will be logged as part of the address's log line. */
1927 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1928 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1931 /* If there's an errno, the message contains just the identity of
1934 if (code != '5') /* Anything other than 5 is treated as temporary */
1937 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1938 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1939 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1940 *message_defer = TRUE;
1944 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1945 ".", or some other transportation error. We defer all addresses and yield
1946 DEFER, except for the case of failed add_headers expansion, or a transport
1947 filter failure, when the yield should be ERROR, to stop it trying other
1952 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1953 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1954 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1960 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1961 SMTP session tidily. However, if there were too many addresses to send in one
1962 message (indicated by first_addr being non-NULL) we want to carry on with the
1963 rest of them. Also, it is desirable to send more than one message down the SMTP
1964 connection if there are several waiting, provided we haven't already sent so
1965 many as to hit the configured limit. The function transport_check_waiting looks
1966 for a waiting message and returns its id. Then transport_pass_socket tries to
1967 set up a continued delivery by passing the socket on to another process. The
1968 variable send_rset is FALSE if a message has just been successfully transfered.
1970 If we are already sending down a continued channel, there may be further
1971 addresses not yet delivered that are aimed at the same host, but which have not
1972 been passed in this run of the transport. In this case, continue_more will be
1973 true, and all we should do is send RSET if necessary, and return, leaving the
1976 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1977 do not want to continue with other messages down the same channel, because that
1978 can lead to looping between two or more messages, all with the same,
1979 temporarily failing address(es). [The retry information isn't updated yet, so
1980 new processes keep on trying.] We probably also don't want to try more of this
1981 message's addresses either.
1983 If we have started a TLS session, we have to end it before passing the
1984 connection to a new process. However, not all servers can handle this (Exim
1985 can), so we do not pass such a connection on if the host matches
1986 hosts_nopass_tls. */
1989 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
1990 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
1991 continue_more, yield, (first_addr == NULL)? "":"not ");
1993 if (completed_address && ok && send_quit)
1996 if (first_addr != NULL || continue_more ||
1999 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2000 host->address, NULL) != OK)
2002 transport_check_waiting(tblock->name, host->name,
2003 tblock->connection_max_messages, new_message_id, &more)
2011 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2013 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2014 host->address, strerror(save_errno));
2017 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2018 ob->command_timeout)))
2021 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2025 DEBUG(D_transport) debug_printf("%s\n", msg);
2030 /* Either RSET was not needed, or it succeeded */
2034 if (first_addr != NULL) /* More addresses still to be sent */
2035 { /* in this run of the transport */
2036 continue_sequence++; /* Causes * in logging */
2039 if (continue_more) return yield; /* More addresses for another run */
2041 /* Pass the socket to a new Exim process. Before doing so, we must shut
2042 down TLS. Not all MTAs allow for the continuation of the SMTP session
2043 when TLS is shut down. We test for this by sending a new EHLO. If we
2044 don't get a good response, we don't attempt to pass the socket on. */
2047 if (tls_active >= 0)
2053 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2054 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2055 ob->command_timeout);
2059 /* If the socket is successfully passed, we musn't send QUIT (or
2060 indeed anything!) from here. */
2062 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2063 new_message_id, inblock.sock))
2069 /* If RSET failed and there are addresses left, they get deferred. */
2071 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2075 /* End off tidily with QUIT unless the connection has died or the socket has
2076 been passed to another process. There has been discussion on the net about what
2077 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2078 to wait for a response, but on the other hand, there isn't anything one can do
2079 with an error response, other than log it. Exim used to do that. However,
2080 further discussion suggested that it is positively advantageous not to wait for
2081 the response, but to close the session immediately. This is supposed to move
2082 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2083 load from the server. (Hosts that are both servers and clients may not see much
2084 difference, of course.) Further discussion indicated that this was safe to do
2085 on Unix systems which have decent implementations of TCP/IP that leave the
2086 connection around for a while (TIME_WAIT) after the application has gone away.
2087 This enables the response sent by the server to be properly ACKed rather than
2088 timed out, as can happen on broken TCP/IP implementations on other OS.
2090 This change is being made on 31-Jul-98. After over a year of trouble-free
2091 operation, the old commented-out code was removed on 17-Sep-99. */
2094 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2102 /* Close the socket, and return the appropriate value, first setting
2103 continue_transport and continue_hostname NULL to prevent any other addresses
2104 that may include the host from trying to re-use a continuation socket. This
2105 works because the NULL setting is passed back to the calling process, and
2106 remote_max_parallel is forced to 1 when delivering over an existing connection,
2108 If all went well and continue_more is set, we shouldn't actually get here if
2109 there are further addresses, as the return above will be taken. However,
2110 writing RSET might have failed, or there may be other addresses whose hosts are
2111 specified in the transports, and therefore not visible at top level, in which
2112 case continue_more won't get set. */
2114 (void)close(inblock.sock);
2115 continue_transport = NULL;
2116 continue_hostname = NULL;
2123 /*************************************************
2124 * Closedown entry point *
2125 *************************************************/
2127 /* This function is called when exim is passed an open smtp channel
2128 from another incarnation, but the message which it has been asked
2129 to deliver no longer exists. The channel is on stdin.
2131 We might do fancy things like looking for another message to send down
2132 the channel, but if the one we sought has gone, it has probably been
2133 delivered by some other process that itself will seek further messages,
2134 so just close down our connection.
2136 Argument: pointer to the transport instance block
2141 smtp_transport_closedown(transport_instance *tblock)
2143 smtp_transport_options_block *ob =
2144 (smtp_transport_options_block *)(tblock->options_block);
2145 smtp_inblock inblock;
2146 smtp_outblock outblock;
2148 uschar inbuffer[4096];
2149 uschar outbuffer[16];
2151 inblock.sock = fileno(stdin);
2152 inblock.buffer = inbuffer;
2153 inblock.buffersize = sizeof(inbuffer);
2154 inblock.ptr = inbuffer;
2155 inblock.ptrend = inbuffer;
2157 outblock.sock = inblock.sock;
2158 outblock.buffersize = sizeof(outbuffer);
2159 outblock.buffer = outbuffer;
2160 outblock.ptr = outbuffer;
2161 outblock.cmd_count = 0;
2162 outblock.authenticating = FALSE;
2164 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2165 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2166 ob->command_timeout);
2167 (void)close(inblock.sock);
2172 /*************************************************
2173 * Prepare addresses for delivery *
2174 *************************************************/
2176 /* This function is called to flush out error settings from previous delivery
2177 attempts to other hosts. It also records whether we got here via an MX record
2178 or not in the more_errno field of the address. We are interested only in
2179 addresses that are still marked DEFER - others may have got delivered to a
2180 previously considered IP address. Set their status to PENDING_DEFER to indicate
2181 which ones are relevant this time.
2184 addrlist the list of addresses
2185 host the host we are delivering to
2187 Returns: the first address for this delivery
2190 static address_item *
2191 prepare_addresses(address_item *addrlist, host_item *host)
2193 address_item *first_addr = NULL;
2195 for (addr = addrlist; addr != NULL; addr = addr->next)
2197 if (addr->transport_return != DEFER) continue;
2198 if (first_addr == NULL) first_addr = addr;
2199 addr->transport_return = PENDING_DEFER;
2200 addr->basic_errno = 0;
2201 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2202 addr->message = NULL;
2204 addr->cipher = NULL;
2205 addr->peerdn = NULL;
2213 /*************************************************
2214 * Main entry point *
2215 *************************************************/
2217 /* See local README for interface details. As this is a remote transport, it is
2218 given a chain of addresses to be delivered in one connection, if possible. It
2219 always returns TRUE, indicating that each address has its own independent
2220 status set, except if there is a setting up problem, in which case it returns
2224 smtp_transport_entry(
2225 transport_instance *tblock, /* data for this instantiation */
2226 address_item *addrlist) /* addresses we are working on */
2230 int hosts_defer = 0;
2232 int hosts_looked_up = 0;
2233 int hosts_retry = 0;
2234 int hosts_serial = 0;
2235 int hosts_total = 0;
2236 int total_hosts_tried = 0;
2238 BOOL expired = TRUE;
2239 BOOL continuing = continue_hostname != NULL;
2240 uschar *expanded_hosts = NULL;
2242 uschar *tid = string_sprintf("%s transport", tblock->name);
2243 smtp_transport_options_block *ob =
2244 (smtp_transport_options_block *)(tblock->options_block);
2245 host_item *hostlist = addrlist->host_list;
2246 host_item *host = NULL;
2250 debug_printf("%s transport entered\n", tblock->name);
2251 for (addr = addrlist; addr != NULL; addr = addr->next)
2252 debug_printf(" %s\n", addr->address);
2253 if (continuing) debug_printf("already connected to %s [%s]\n",
2254 continue_hostname, continue_host_address);
2257 /* Set the flag requesting that these hosts be added to the waiting
2258 database if the delivery fails temporarily or if we are running with
2259 queue_smtp or a 2-stage queue run. This gets unset for certain
2260 kinds of error, typically those that are specific to the message. */
2262 update_waiting = TRUE;
2264 /* If a host list is not defined for the addresses - they must all have the
2265 same one in order to be passed to a single transport - or if the transport has
2266 a host list with hosts_override set, use the host list supplied with the
2267 transport. It is an error for this not to exist. */
2269 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2271 if (ob->hosts == NULL)
2273 addrlist->message = string_sprintf("%s transport called with no hosts set",
2275 addrlist->transport_return = PANIC;
2276 return FALSE; /* Only top address has status */
2279 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2282 /* If the transport's host list contains no '$' characters, and we are not
2283 randomizing, it is fixed and therefore a chain of hosts can be built once
2284 and for all, and remembered for subsequent use by other calls to this
2285 transport. If, on the other hand, the host list does contain '$', or we are
2286 randomizing its order, we have to rebuild it each time. In the fixed case,
2287 as the hosts string will never be used again, it doesn't matter that we
2288 replace all the : characters with zeros. */
2290 if (ob->hostlist == NULL)
2292 uschar *s = ob->hosts;
2294 if (Ustrchr(s, '$') != NULL)
2296 expanded_hosts = expand_string(s);
2297 if (expanded_hosts == NULL)
2299 addrlist->message = string_sprintf("failed to expand list of hosts "
2300 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2301 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2302 return FALSE; /* Only top address has status */
2304 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2305 "\"%s\"\n", s, expanded_hosts);
2309 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2311 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2313 /* Check that the expansion yielded something useful. */
2314 if (hostlist == NULL)
2317 string_sprintf("%s transport has empty hosts setting", tblock->name);
2318 addrlist->transport_return = PANIC;
2319 return FALSE; /* Only top address has status */
2322 /* If there was no expansion of hosts, save the host list for
2325 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2328 /* This is not the first time this transport has been run in this delivery;
2329 the host list was built previously. */
2331 else hostlist = ob->hostlist;
2334 /* The host list was supplied with the address. If hosts_randomize is set, we
2335 must sort it into a random order if it did not come from MX records and has not
2336 already been randomized (but don't bother if continuing down an existing
2339 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2341 host_item *newlist = NULL;
2342 while (hostlist != NULL)
2344 host_item *h = hostlist;
2345 hostlist = hostlist->next;
2347 h->sort_key = random_number(100);
2349 if (newlist == NULL)
2354 else if (h->sort_key < newlist->sort_key)
2361 host_item *hh = newlist;
2362 while (hh->next != NULL)
2364 if (h->sort_key < hh->next->sort_key) break;
2372 hostlist = addrlist->host_list = newlist;
2376 /* Sort out the default port. */
2378 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2381 /* For each host-plus-IP-address on the list:
2383 . If this is a continued delivery and the host isn't the one with the
2384 current connection, skip.
2386 . If the status is unusable (i.e. previously failed or retry checked), skip.
2388 . If no IP address set, get the address, either by turning the name into
2389 an address, calling gethostbyname if gethostbyname is on, or by calling
2390 the DNS. The DNS may yield multiple addresses, in which case insert the
2391 extra ones into the list.
2393 . Get the retry data if not previously obtained for this address and set the
2394 field which remembers the state of this address. Skip if the retry time is
2395 not reached. If not, remember whether retry data was found. The retry string
2396 contains both the name and the IP address.
2398 . Scan the list of addresses and mark those whose status is DEFER as
2399 PENDING_DEFER. These are the only ones that will be processed in this cycle
2402 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2403 Some addresses may be successfully delivered, others may fail, and yet
2404 others may get temporary errors and so get marked DEFER.
2406 . The return from the delivery attempt is OK if a connection was made and a
2407 valid SMTP dialogue was completed. Otherwise it is DEFER.
2409 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2411 . If fail to connect, or other defer state, add a retry item.
2413 . If there are any addresses whose status is still DEFER, carry on to the
2414 next host/IPaddress, unless we have tried the number of hosts given
2415 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2416 there is some fancy logic for hosts_max_try that means its limit can be
2417 overstepped in some circumstances.
2419 If we get to the end of the list, all hosts have deferred at least one address,
2420 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2421 delivery attempt to those hosts whose last try was before the arrival time of
2422 the current message. To cope with this, we have to go round the loop a second
2423 time. After that, set the status and error data for any addresses that haven't
2424 had it set already. */
2426 for (cutoff_retry = 0; expired &&
2427 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2430 host_item *nexthost = NULL;
2431 int unexpired_hosts_tried = 0;
2433 for (host = hostlist;
2435 unexpired_hosts_tried < ob->hosts_max_try &&
2436 total_hosts_tried < ob->hosts_max_try_hardlimit;
2442 BOOL serialized = FALSE;
2443 BOOL host_is_expired = FALSE;
2444 BOOL message_defer = FALSE;
2445 BOOL ifchanges = FALSE;
2446 BOOL some_deferred = FALSE;
2447 address_item *first_addr = NULL;
2448 uschar *interface = NULL;
2449 uschar *retry_host_key = NULL;
2450 uschar *retry_message_key = NULL;
2451 uschar *serialize_key = NULL;
2453 /* Default next host is next host. :-) But this can vary if the
2454 hosts_max_try limit is hit (see below). It may also be reset if a host
2455 address is looked up here (in case the host was multihomed). */
2457 nexthost = host->next;
2459 /* If the address hasn't yet been obtained from the host name, look it up
2460 now, unless the host is already marked as unusable. If it is marked as
2461 unusable, it means that the router was unable to find its IP address (in
2462 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2463 the lookup failed last time. We don't get this far if *all* MX records
2464 point to non-existent hosts; that is treated as a hard error.
2466 We can just skip this host entirely. When the hosts came from the router,
2467 the address will timeout based on the other host(s); when the address is
2468 looked up below, there is an explicit retry record added.
2470 Note that we mustn't skip unusable hosts if the address is not unset; they
2471 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2473 if (host->address == NULL)
2475 int new_port, flags;
2477 uschar *canonical_name;
2479 if (host->status >= hstatus_unusable)
2481 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2486 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2488 /* The host name is permitted to have an attached port. Find it, and
2489 strip it from the name. Just remember it for now. */
2491 new_port = host_item_get_port(host);
2493 /* Count hosts looked up */
2497 /* Find by name if so configured, or if it's an IP address. We don't
2498 just copy the IP address, because we need the test-for-local to happen. */
2500 flags = HOST_FIND_BY_A;
2501 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2502 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2504 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2505 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2507 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2508 &canonical_name, NULL);
2510 /* Update the host (and any additional blocks, resulting from
2511 multihoming) with a host-specific port, if any. */
2513 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2515 /* Failure to find the host at this time (usually DNS temporary failure)
2516 is really a kind of routing failure rather than a transport failure.
2517 Therefore we add a retry item of the routing kind, not to stop us trying
2518 to look this name up here again, but to ensure the address gets timed
2519 out if the failures go on long enough. A complete failure at this point
2520 commonly points to a configuration error, but the best action is still
2521 to carry on for the next host. */
2523 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2525 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2527 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2528 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2529 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2530 host->status = hstatus_unusable;
2532 for (addr = addrlist; addr != NULL; addr = addr->next)
2534 if (addr->transport_return != DEFER) continue;
2535 addr->basic_errno = ERRNO_UNKNOWNHOST;
2537 string_sprintf("failed to lookup IP address for %s", host->name);
2542 /* If the host is actually the local host, we may have a problem, or
2543 there may be some cunning configuration going on. In the problem case,
2544 log things and give up. The default transport status is already DEFER. */
2546 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2548 for (addr = addrlist; addr != NULL; addr = addr->next)
2550 addr->basic_errno = 0;
2551 addr->message = string_sprintf("%s transport found host %s to be "
2552 "local", tblock->name, host->name);
2556 } /* End of block for IP address lookup */
2558 /* If this is a continued delivery, we are interested only in the host
2559 which matches the name of the existing open channel. The check is put
2560 here after the local host lookup, in case the name gets expanded as a
2561 result of the lookup. Set expired FALSE, to save the outer loop executing
2564 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2565 Ustrcmp(continue_host_address, host->address) != 0))
2568 continue; /* With next host */
2571 /* Reset the default next host in case a multihomed host whose addresses
2572 are not looked up till just above added to the host list. */
2574 nexthost = host->next;
2576 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2577 domain is in queue_smtp_domains, we don't actually want to attempt any
2578 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2579 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2580 were not in it. We don't want to hold up all SMTP deliveries! Except when
2581 doing a two-stage queue run, don't do this if forcing. */
2583 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2584 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2585 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2588 for (addr = addrlist; addr != NULL; addr = addr->next)
2590 if (addr->transport_return != DEFER) continue;
2591 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2593 continue; /* With next host */
2596 /* Count hosts being considered - purely for an intelligent comment
2597 if none are usable. */
2601 /* Set $host and $host address now in case they are needed for the
2602 interface expansion or the serialize_hosts check; they remain set if an
2603 actual delivery happens. */
2605 deliver_host = host->name;
2606 deliver_host_address = host->address;
2608 /* Set up a string for adding to the retry key if the port number is not
2609 the standard SMTP port. A host may have its own port setting that overrides
2612 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2614 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2616 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2617 string changes upon expansion, we must add it to the key that is used for
2618 retries, because connections to the same host from a different interface
2619 should be treated separately. */
2621 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2622 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2625 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2627 /* The first time round the outer loop, check the status of the host by
2628 inspecting the retry data. The second time round, we are interested only
2629 in expired hosts that haven't been tried since this message arrived. */
2631 if (cutoff_retry == 0)
2633 /* Ensure the status of the address is set by checking retry data if
2634 necessary. There maybe host-specific retry data (applicable to all
2635 messages) and also data for retries of a specific message at this host.
2636 If either of these retry records are actually read, the keys used are
2637 returned to save recomputing them later. */
2639 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2640 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2642 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2643 (host->address == NULL)? US"" : host->address, pistring,
2644 (host->status == hstatus_usable)? "usable" :
2645 (host->status == hstatus_unusable)? "unusable" :
2646 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2648 /* Skip this address if not usable at this time, noting if it wasn't
2649 actually expired, both locally and in the address. */
2651 switch (host->status)
2653 case hstatus_unusable:
2655 setflag(addrlist, af_retry_skipped);
2658 case hstatus_unusable_expired:
2661 case hwhy_retry: hosts_retry++; break;
2662 case hwhy_failed: hosts_fail++; break;
2663 case hwhy_deferred: hosts_defer++; break;
2666 /* If there was a retry message key, implying that previously there
2667 was a message-specific defer, we don't want to update the list of
2668 messages waiting for these hosts. */
2670 if (retry_message_key != NULL) update_waiting = FALSE;
2671 continue; /* With the next host or IP address */
2675 /* Second time round the loop: if the address is set but expired, and
2676 the message is newer than the last try, let it through. */
2680 if (host->address == NULL ||
2681 host->status != hstatus_unusable_expired ||
2682 host->last_try > received_time)
2685 debug_printf("trying expired host %s [%s]%s\n",
2686 host->name, host->address, pistring);
2687 host_is_expired = TRUE;
2690 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2691 it remains TRUE only if all hosts are expired and none are actually tried.
2696 /* If this host is listed as one to which access must be serialized,
2697 see if another Exim process has a connection to it, and if so, skip
2698 this host. If not, update the database to record our connection to it
2699 and remember this for later deletion. Do not do any of this if we are
2700 sending the message down a pre-existing connection. */
2703 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2704 host->address, NULL) == OK)
2706 serialize_key = string_sprintf("host-serialize-%s", host->name);
2707 if (!enq_start(serialize_key))
2710 debug_printf("skipping host %s because another Exim process "
2711 "is connected to it\n", host->name);
2718 /* OK, we have an IP address that is not waiting for its retry time to
2719 arrive (it might be expired) OR (second time round the loop) we have an
2720 expired host that hasn't been tried since the message arrived. Have a go
2721 at delivering the message to it. First prepare the addresses by flushing
2722 out the result of previous attempts, and finding the first address that
2723 is still to be delivered. */
2725 first_addr = prepare_addresses(addrlist, host);
2727 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2728 message_id, host->name, host->address, addrlist->address,
2729 (addrlist->next == NULL)? "" : ", ...");
2731 set_process_info("delivering %s to %s [%s] (%s%s)",
2732 message_id, host->name, host->address, addrlist->address,
2733 (addrlist->next == NULL)? "" : ", ...");
2735 /* This is not for real; don't do the delivery. If there are
2736 any remaining hosts, list them. */
2741 set_errno(addrlist, 0, NULL, OK, FALSE);
2742 for (addr = addrlist; addr != NULL; addr = addr->next)
2744 addr->host_used = host;
2745 addr->special_action = '*';
2746 addr->message = US"delivery bypassed by -N option";
2750 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2751 "*** host and remaining hosts:\n", tblock->name);
2752 for (host2 = host; host2 != NULL; host2 = host2->next)
2753 debug_printf(" %s [%s]\n", host2->name,
2754 (host2->address == NULL)? US"unset" : host2->address);
2759 /* This is for real. If the host is expired, we don't count it for
2760 hosts_max_retry. This ensures that all hosts must expire before an address
2761 is timed out, unless hosts_max_try_hardlimit (which protects against
2762 lunatic DNS configurations) is reached.
2764 If the host is not expired and we are about to hit the hosts_max_retry
2765 limit, check to see if there is a subsequent hosts with a different MX
2766 value. If so, make that the next host, and don't count this one. This is a
2767 heuristic to make sure that different MXs do get tried. With a normal kind
2768 of retry rule, they would get tried anyway when the earlier hosts were
2769 delayed, but if the domain has a "retry every time" type of rule - as is
2770 often used for the the very large ISPs, that won't happen. */
2774 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2778 debug_printf("hosts_max_try limit reached with this host\n");
2779 for (h = host; h != NULL; h = h->next)
2780 if (h->mx != host->mx) break;
2784 unexpired_hosts_tried--;
2785 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2786 "and will be tried\n");
2790 /* Attempt the delivery. */
2792 total_hosts_tried++;
2793 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2794 expanded_hosts != NULL, &message_defer, FALSE);
2797 OK => connection made, each address contains its result;
2798 message_defer is set for message-specific defers (when all
2799 recipients are marked defer)
2800 DEFER => there was a non-message-specific delivery problem;
2801 ERROR => there was a problem setting up the arguments for a filter,
2802 or there was a problem with expanding added headers
2805 /* If the result is not OK, there was a non-message-specific problem.
2806 If the result is DEFER, we need to write to the logs saying what happened
2807 for this particular host, except in the case of authentication and TLS
2808 failures, where the log has already been written. If all hosts defer a
2809 general message is written at the end. */
2811 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2812 first_addr->basic_errno != ERRNO_TLSFAILURE)
2813 write_logs(first_addr, host);
2815 /* If STARTTLS was accepted, but there was a failure in setting up the
2816 TLS session (usually a certificate screwup), and the host is not in
2817 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2818 TLS forcibly turned off. We have to start from scratch with a new SMTP
2819 connection. That's why the retry is done from here, not from within
2820 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2821 session, so the in-clear transmission after those errors, if permitted,
2822 happens inside smtp_deliver().] */
2825 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2826 ob->tls_tempfail_tryclear &&
2827 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2828 host->address, NULL) != OK)
2830 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2831 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2832 first_addr = prepare_addresses(addrlist, host);
2833 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2834 expanded_hosts != NULL, &message_defer, TRUE);
2835 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2836 write_logs(first_addr, host);
2841 /* Delivery attempt finished */
2843 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2846 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2847 message_id, host->name, host->address, addrlist->address,
2848 (addrlist->next == NULL)? "" : " (& others)", rs);
2850 /* Release serialization if set up */
2852 if (serialized) enq_end(serialize_key);
2854 /* If the result is DEFER, or if a host retry record is known to exist, we
2855 need to add an item to the retry chain for updating the retry database
2856 at the end of delivery. We only need to add the item to the top address,
2857 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2858 for any other delivery attempts using the same address. (It is copied into
2859 the unusable tree at the outer level, so even if different address blocks
2860 contain the same address, it still won't get tried again.) */
2862 if (rc == DEFER || retry_host_key != NULL)
2864 int delete_flag = (rc != DEFER)? rf_delete : 0;
2865 if (retry_host_key == NULL)
2867 retry_host_key = ob->retry_include_ip_address?
2868 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2869 string_sprintf("T:%S%s", host->name, pistring);
2872 /* If a delivery of another message over an existing SMTP connection
2873 yields DEFER, we do NOT set up retry data for the host. This covers the
2874 case when there are delays in routing the addresses in the second message
2875 that are so long that the server times out. This is alleviated by not
2876 routing addresses that previously had routing defers when handling an
2877 existing connection, but even so, this case may occur (e.g. if a
2878 previously happily routed address starts giving routing defers). If the
2879 host is genuinely down, another non-continued message delivery will
2880 notice it soon enough. */
2882 if (delete_flag != 0 || !continuing)
2883 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2885 /* We may have tried an expired host, if its retry time has come; ensure
2886 the status reflects the expiry for the benefit of any other addresses. */
2890 host->status = (host_is_expired)?
2891 hstatus_unusable_expired : hstatus_unusable;
2892 host->why = hwhy_deferred;
2896 /* If message_defer is set (host was OK, but every recipient got deferred
2897 because of some message-specific problem), or if that had happened
2898 previously so that a message retry key exists, add an appropriate item
2899 to the retry chain. Note that if there was a message defer but now there is
2900 a host defer, the message defer record gets deleted. That seems perfectly
2901 reasonable. Also, stop the message from being remembered as waiting
2902 for specific hosts. */
2904 if (message_defer || retry_message_key != NULL)
2906 int delete_flag = message_defer? 0 : rf_delete;
2907 if (retry_message_key == NULL)
2909 retry_message_key = ob->retry_include_ip_address?
2910 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2912 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2914 retry_add_item(addrlist, retry_message_key,
2915 rf_message | rf_host | delete_flag);
2916 update_waiting = FALSE;
2919 /* Any return other than DEFER (that is, OK or ERROR) means that the
2920 addresses have got their final statuses filled in for this host. In the OK
2921 case, see if any of them are deferred. */
2925 for (addr = addrlist; addr != NULL; addr = addr->next)
2927 if (addr->transport_return == DEFER)
2929 some_deferred = TRUE;
2935 /* If no addresses deferred or the result was ERROR, return. We do this for
2936 ERROR because a failing filter set-up or add_headers expansion is likely to
2937 fail for any host we try. */
2939 if (rc == ERROR || (rc == OK && !some_deferred))
2941 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2942 return TRUE; /* Each address has its status */
2945 /* If the result was DEFER or some individual addresses deferred, let
2946 the loop run to try other hosts with the deferred addresses, except for the
2947 case when we were trying to deliver down an existing channel and failed.
2948 Don't try any other hosts in this case. */
2950 if (continuing) break;
2952 /* If the whole delivery, or some individual addresses, were deferred and
2953 there are more hosts that could be tried, do not count this host towards
2954 the hosts_max_try limit if the age of the message is greater than the
2955 maximum retry time for this host. This means we may try try all hosts,
2956 ignoring the limit, when messages have been around for some time. This is
2957 important because if we don't try all hosts, the address will never time
2958 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2960 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2963 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2965 if (retry != NULL && retry->rules != NULL)
2967 retry_rule *last_rule;
2968 for (last_rule = retry->rules;
2969 last_rule->next != NULL;
2970 last_rule = last_rule->next);
2971 timedout = time(NULL) - received_time > last_rule->timeout;
2973 else timedout = TRUE; /* No rule => timed out */
2977 unexpired_hosts_tried--;
2978 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2979 "hosts_max_try (message older than host's retry time)\n");
2982 } /* End of loop for trying multiple hosts. */
2984 /* This is the end of the loop that repeats iff expired is TRUE and
2985 ob->delay_after_cutoff is FALSE. The second time round we will
2986 try those hosts that haven't been tried since the message arrived. */
2990 debug_printf("all IP addresses skipped or deferred at least one address\n");
2991 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
2992 debug_printf("retrying IP addresses not tried since message arrived\n");
2997 /* Get here if all IP addresses are skipped or defer at least one address. In
2998 MUA wrapper mode, this will happen only for connection or other non-message-
2999 specific failures. Force the delivery status for all addresses to FAIL. */
3003 for (addr = addrlist; addr != NULL; addr = addr->next)
3004 addr->transport_return = FAIL;
3008 /* In the normal, non-wrapper case, add a standard message to each deferred
3009 address if there hasn't been an error, that is, if it hasn't actually been
3010 tried this time. The variable "expired" will be FALSE if any deliveries were
3011 actually tried, or if there was at least one host that was not expired. That
3012 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3013 a delivery has been tried, an error code will be set, and the failing of the
3014 message is handled by the retry code later.
3016 If queue_smtp is set, or this transport was called to send a subsequent message
3017 down an existing TCP/IP connection, and something caused the host not to be
3018 found, we end up here, but can detect these cases and handle them specially. */
3020 for (addr = addrlist; addr != NULL; addr = addr->next)
3022 /* If host is not NULL, it means that we stopped processing the host list
3023 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3024 means we need to behave as if some hosts were skipped because their retry
3025 time had not come. Specifically, this prevents the address from timing out.
3026 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3027 hosts were tried. */
3031 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3034 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3035 "hosts were tried\n");
3040 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3041 setflag(addr, af_retry_skipped);
3045 if (queue_smtp) /* no deliveries attempted */
3047 addr->transport_return = DEFER;
3048 addr->basic_errno = 0;
3049 addr->message = US"SMTP delivery explicitly queued";
3052 else if (addr->transport_return == DEFER &&
3053 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3054 addr->message == NULL)
3056 addr->basic_errno = ERRNO_HRETRY;
3057 if (continue_hostname != NULL)
3059 addr->message = US"no host found for existing SMTP connection";
3063 setflag(addr, af_pass_message); /* This is not a security risk */
3064 addr->message = (ob->delay_after_cutoff)?
3065 US"retry time not reached for any host after a long failure period" :
3066 US"all hosts have been failing for a long time and were last tried "
3067 "after this message arrived";
3069 /* If we are already using fallback hosts, or there are no fallback hosts
3070 defined, convert the result to FAIL to cause a bounce. */
3072 if (addr->host_list == addr->fallback_hosts ||
3073 addr->fallback_hosts == NULL)
3074 addr->transport_return = FAIL;
3078 if (hosts_retry == hosts_total)
3079 addr->message = US"retry time not reached for any host";
3080 else if (hosts_fail == hosts_total)
3081 addr->message = US"all host address lookups failed permanently";
3082 else if (hosts_defer == hosts_total)
3083 addr->message = US"all host address lookups failed temporarily";
3084 else if (hosts_serial == hosts_total)
3085 addr->message = US"connection limit reached for all hosts";
3086 else if (hosts_fail+hosts_defer == hosts_total)
3087 addr->message = US"all host address lookups failed";
3088 else addr->message = US"some host address lookups failed and retry time "
3089 "not reached for other hosts or connection limit reached";
3094 /* Update the database which keeps information about which messages are waiting
3095 for which hosts to become available. For some message-specific errors, the
3096 update_waiting flag is turned off because we don't want follow-on deliveries in
3099 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3103 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3105 return TRUE; /* Each address has its status */
3108 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob