1 /* $Cambridge: exim/src/src/transports/smtp.c,v 1.35 2007/02/06 14:49:13 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
14 #define PENDING_DEFER (PENDING + DEFER)
15 #define PENDING_OK (PENDING + OK)
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
23 optionlist smtp_transport_options[] = {
24 { "address_retry_include_sender", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
26 { "allow_localhost", opt_bool,
27 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
28 { "authenticated_sender", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
30 { "authenticated_sender_force", opt_bool,
31 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
32 { "command_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, command_timeout) },
34 { "connect_timeout", opt_time,
35 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
36 { "connection_max_messages", opt_int | opt_public,
37 (void *)offsetof(transport_instance, connection_max_messages) },
38 { "data_timeout", opt_time,
39 (void *)offsetof(smtp_transport_options_block, data_timeout) },
40 { "delay_after_cutoff", opt_bool,
41 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 #ifdef EXPERIMENTAL_DOMAINKEYS
43 { "dk_canon", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dk_canon) },
45 { "dk_domain", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dk_domain) },
47 { "dk_headers", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dk_headers) },
49 { "dk_private_key", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dk_private_key) },
51 { "dk_selector", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dk_selector) },
53 { "dk_strict", opt_stringptr,
54 (void *)offsetof(smtp_transport_options_block, dk_strict) },
56 { "dns_qualify_single", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
58 { "dns_search_parents", opt_bool,
59 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
60 { "fallback_hosts", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
62 { "final_timeout", opt_time,
63 (void *)offsetof(smtp_transport_options_block, final_timeout) },
64 { "gethostbyname", opt_bool,
65 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
67 { "gnutls_require_kx", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
69 { "gnutls_require_mac", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
71 { "gnutls_require_protocols", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
74 { "helo_data", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, helo_data) },
76 { "hosts", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, hosts) },
78 { "hosts_avoid_esmtp", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
80 { "hosts_avoid_pipelining", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
83 { "hosts_avoid_tls", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
86 { "hosts_max_try", opt_int,
87 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
88 { "hosts_max_try_hardlimit", opt_int,
89 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
91 { "hosts_nopass_tls", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 { "hosts_override", opt_bool,
95 (void *)offsetof(smtp_transport_options_block, hosts_override) },
96 { "hosts_randomize", opt_bool,
97 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
98 { "hosts_require_auth", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
101 { "hosts_require_tls", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
104 { "hosts_try_auth", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
106 { "interface", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, interface) },
108 { "keepalive", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, keepalive) },
110 { "lmtp_ignore_quota", opt_bool,
111 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
112 { "max_rcpt", opt_int | opt_public,
113 (void *)offsetof(transport_instance, max_addresses) },
114 { "multi_domain", opt_bool | opt_public,
115 (void *)offsetof(transport_instance, multi_domain) },
116 { "port", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, port) },
118 { "protocol", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, protocol) },
120 { "retry_include_ip_address", opt_bool,
121 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
122 { "serialize_hosts", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
124 { "size_addition", opt_int,
125 (void *)offsetof(smtp_transport_options_block, size_addition) }
127 ,{ "tls_certificate", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
129 { "tls_crl", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, tls_crl) },
131 { "tls_privatekey", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
133 { "tls_require_ciphers", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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 */
198 #ifdef EXPERIMENTAL_DOMAINKEYS
199 ,NULL, /* dk_canon */
200 NULL, /* dk_domain */
201 NULL, /* dk_headers */
202 NULL, /* dk_private_key */
203 NULL, /* dk_selector */
211 static uschar *smtp_command; /* Points to last cmd for error messages */
212 static uschar *mail_command; /* Points to MAIL cmd for error messages */
213 static BOOL update_waiting; /* TRUE to update the "wait" database */
216 /*************************************************
217 * Setup entry point *
218 *************************************************/
220 /* This function is called when the transport is about to be used,
221 but before running it in a sub-process. It is used for two things:
223 (1) To set the fallback host list in addresses, when delivering.
224 (2) To pass back the interface, port, protocol, and other options, for use
225 during callout verification.
228 tblock pointer to the transport instance block
229 addrlist list of addresses about to be transported
230 tf if not NULL, pointer to block in which to return options
231 uid the uid that will be set (not used)
232 gid the gid that will be set (not used)
233 errmsg place for error message (not used)
235 Returns: OK always (FAIL, DEFER not used)
239 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
240 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
242 smtp_transport_options_block *ob =
243 (smtp_transport_options_block *)(tblock->options_block);
245 errmsg = errmsg; /* Keep picky compilers happy */
249 /* Pass back options if required. This interface is getting very messy. */
253 tf->interface = ob->interface;
255 tf->protocol = ob->protocol;
256 tf->hosts = ob->hosts;
257 tf->hosts_override = ob->hosts_override;
258 tf->hosts_randomize = ob->hosts_randomize;
259 tf->gethostbyname = ob->gethostbyname;
260 tf->qualify_single = ob->dns_qualify_single;
261 tf->search_parents = ob->dns_search_parents;
262 tf->helo_data = ob->helo_data;
265 /* Set the fallback host list for all the addresses that don't have fallback
266 host lists, provided that the local host wasn't present in the original host
269 if (!testflag(addrlist, af_local_host_removed))
271 for (; addrlist != NULL; addrlist = addrlist->next)
272 if (addrlist->fallback_hosts == NULL)
273 addrlist->fallback_hosts = ob->fallback_hostlist;
281 /*************************************************
282 * Initialization entry point *
283 *************************************************/
285 /* Called for each instance, after its options have been read, to
286 enable consistency checks to be done, or anything else that needs
289 Argument: pointer to the transport instance block
294 smtp_transport_init(transport_instance *tblock)
296 smtp_transport_options_block *ob =
297 (smtp_transport_options_block *)(tblock->options_block);
299 /* Retry_use_local_part defaults FALSE if unset */
301 if (tblock->retry_use_local_part == TRUE_UNSET)
302 tblock->retry_use_local_part = FALSE;
304 /* Set the default port according to the protocol */
306 if (ob->port == NULL)
307 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp";
309 /* Set up the setup entry point, to be called before subprocesses for this
312 tblock->setup = smtp_transport_setup;
314 /* Complain if any of the timeouts are zero. */
316 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
317 ob->final_timeout <= 0)
318 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
319 "command, data, or final timeout value is zero for %s transport",
322 /* If hosts_override is set and there are local hosts, set the global
323 flag that stops verify from showing router hosts. */
325 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
327 /* If there are any fallback hosts listed, build a chain of host items
328 for them, but do not do any lookups at this time. */
330 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
337 /*************************************************
338 * Set delivery info into all active addresses *
339 *************************************************/
341 /* Only addresses whose status is >= PENDING are relevant. A lesser
342 status means that an address is not currently being processed.
345 addrlist points to a chain of addresses
346 errno_value to put in each address's errno field
347 msg to put in each address's message field
348 rc to put in each address's transport_return field
349 pass_message if TRUE, set the "pass message" flag in the address
351 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
352 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
353 this particular type of timeout.
359 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
364 if (errno_value == ERRNO_CONNECTTIMEOUT)
366 errno_value = ETIMEDOUT;
367 orvalue = RTEF_CTOUT;
369 for (addr = addrlist; addr != NULL; addr = addr->next)
371 if (addr->transport_return < PENDING) continue;
372 addr->basic_errno = errno_value;
373 addr->more_errno |= orvalue;
377 if (pass_message) setflag(addr, af_pass_message);
379 addr->transport_return = rc;
385 /*************************************************
386 * Check an SMTP response *
387 *************************************************/
389 /* This function is given an errno code and the SMTP response buffer
390 to analyse, together with the host identification for generating messages. It
391 sets an appropriate message and puts the first digit of the response code into
392 the yield variable. If no response was actually read, a suitable digit is
396 host the current host, to get its name for messages
397 errno_value pointer to the errno value
398 more_errno from the top address for use with ERRNO_FILTER_FAIL
399 buffer the SMTP response buffer
400 yield where to put a one-digit SMTP response code
401 message where to put an errror message
402 pass_message set TRUE if message is an SMTP response
404 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
407 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
408 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
412 if (smtp_use_pipelining &&
413 (Ustrcmp(smtp_command, "MAIL") == 0 ||
414 Ustrcmp(smtp_command, "RCPT") == 0 ||
415 Ustrcmp(smtp_command, "DATA") == 0))
418 *yield = '4'; /* Default setting is to give a temporary error */
420 /* Handle response timeout */
422 if (*errno_value == ETIMEDOUT)
424 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
425 "after %s%s", host->name, host->address, pl, smtp_command);
426 if (transport_count > 0)
427 *message = US string_sprintf("%s (%d bytes written)", *message,
432 /* Handle malformed SMTP response */
434 if (*errno_value == ERRNO_SMTPFORMAT)
436 uschar *malfresp = string_printing(buffer);
437 while (isspace(*malfresp)) malfresp++;
439 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
440 "%s [%s] in response to %s%s", host->name, host->address, pl,
443 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
444 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
448 /* Handle a failed filter process error; can't send QUIT as we mustn't
451 if (*errno_value == ERRNO_FILTER_FAIL)
453 *message = US string_sprintf("transport filter process failed (%d)%s",
455 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
459 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
462 if (*errno_value == ERRNO_CHHEADER_FAIL)
465 US string_sprintf("failed to expand headers_add or headers_remove: %s",
466 expand_string_message);
470 /* Handle failure to write a complete data block */
472 if (*errno_value == ERRNO_WRITEINCOMPLETE)
474 *message = US string_sprintf("failed to write a data block");
478 /* Handle error responses from the remote mailer. */
482 uschar *s = string_printing(buffer);
483 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
484 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
485 *pass_message = TRUE;
490 /* No data was read. If there is no errno, this must be the EOF (i.e.
491 connection closed) case, which causes deferral. An explicit connection reset
492 error has the same effect. Otherwise, put the host's identity in the message,
493 leaving the errno value to be interpreted as well. In all cases, we have to
494 assume the connection is now dead. */
496 if (*errno_value == 0 || *errno_value == ECONNRESET)
498 *errno_value = ERRNO_SMTPCLOSED;
499 *message = US string_sprintf("Remote host %s [%s] closed connection "
500 "in response to %s%s", host->name, host->address, pl, smtp_command);
502 else *message = US string_sprintf("%s [%s]", host->name, host->address);
509 /*************************************************
510 * Write error message to logs *
511 *************************************************/
513 /* This writes to the main log and to the message log.
516 addr the address item containing error information
517 host the current host
523 write_logs(address_item *addr, host_item *host)
525 if (addr->message != NULL)
527 uschar *message = addr->message;
528 if (addr->basic_errno > 0)
529 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
530 log_write(0, LOG_MAIN, "%s", message);
531 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
536 ((log_extra_selector & LX_outgoing_port) != 0)?
537 string_sprintf("%s [%s]:%d", host->name, host->address,
538 (host->port == PORT_NONE)? 25 : host->port)
540 string_sprintf("%s [%s]", host->name, host->address);
541 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
542 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
543 strerror(addr->basic_errno));
549 /*************************************************
550 * Synchronize SMTP responses *
551 *************************************************/
553 /* This function is called from smtp_deliver() to receive SMTP responses from
554 the server, and match them up with the commands to which they relate. When
555 PIPELINING is not in use, this function is called after every command, and is
556 therefore somewhat over-engineered, but it is simpler to use a single scheme
557 that works both with and without PIPELINING instead of having two separate sets
560 The set of commands that are buffered up with pipelining may start with MAIL
561 and may end with DATA; in between are RCPT commands that correspond to the
562 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
563 etc.) are never buffered.
565 Errors after MAIL or DATA abort the whole process leaving the response in the
566 buffer. After MAIL, pending responses are flushed, and the original command is
567 re-instated in big_buffer for error messages. For RCPT commands, the remote is
568 permitted to reject some recipient addresses while accepting others. However
569 certain errors clearly abort the whole process. Set the value in
570 transport_return to PENDING_OK if the address is accepted. If there is a
571 subsequent general error, it will get reset accordingly. If not, it will get
572 converted to OK at the end.
575 addrlist the complete address list
576 include_affixes TRUE if affixes include in RCPT
577 sync_addr ptr to the ptr of the one to start scanning at (updated)
578 host the host we are connected to
579 count the number of responses to read
581 include_sender true if 4xx retry is to include the sender it its key
582 pending_MAIL true if the first response is for MAIL
583 pending_DATA 0 if last command sent was not DATA
584 +1 if previously had a good recipient
585 -1 if not previously had a good recipient
586 inblock incoming SMTP block
587 timeout timeout value
588 buffer buffer for reading response
589 buffsize size of buffer
591 Returns: 3 if at least one address had 2xx and one had 5xx
592 2 if at least one address had 5xx but none had 2xx
593 1 if at least one host had a 2xx response, but none had 5xx
594 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
595 -1 timeout while reading RCPT response
596 -2 I/O or other non-response error for RCPT
597 -3 DATA or MAIL failed - errno and buffer set
601 sync_responses(address_item *addrlist, BOOL include_affixes,
602 address_item **sync_addr, host_item *host, int count,
603 BOOL address_retry_include_sender, BOOL pending_MAIL,
604 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
607 address_item *addr = *sync_addr;
610 /* Handle the response for a MAIL command. On error, reinstate the original
611 command in big_buffer for error message use, and flush any further pending
612 responses before returning, except after I/O errors and timeouts. */
617 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
619 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
620 if (errno == 0 && buffer[0] != 0)
622 uschar flushbuffer[4096];
624 if (buffer[0] == '4')
626 save_errno = ERRNO_MAIL4XX;
627 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
631 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
633 && (errno != 0 || flushbuffer[0] == 0))
642 if (pending_DATA) count--; /* Number of RCPT responses to come */
644 /* Read and handle the required number of RCPT responses, matching each one up
645 with an address by scanning for the next address whose status is PENDING_DEFER.
650 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
652 /* The address was accepted */
654 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
657 addr->transport_return = PENDING_OK;
659 /* If af_dr_retry_exists is set, there was a routing delay on this address;
660 ensure that any address-specific retry record is expunged. We do this both
661 for the basic key and for the version that also includes the sender. */
663 if (testflag(addr, af_dr_retry_exists))
665 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
667 retry_add_item(addr, altkey, rf_delete);
668 retry_add_item(addr, addr->address_retry_key, rf_delete);
672 /* Timeout while reading the response */
674 else if (errno == ETIMEDOUT)
676 int save_errno = errno;
677 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
678 "after RCPT TO:<%s>", host->name, host->address,
679 transport_rcpt_address(addr, include_affixes));
680 set_errno(addrlist, save_errno, message, DEFER, FALSE);
681 retry_add_item(addr, addr->address_retry_key, 0);
682 update_waiting = FALSE;
686 /* Handle other errors in obtaining an SMTP response by returning -1. This
687 will cause all the addresses to be deferred. Restore the SMTP command in
688 big_buffer for which we are checking the response, so the error message
691 else if (errno != 0 || buffer[0] == 0)
693 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
694 transport_rcpt_address(addr, include_affixes));
698 /* Handle SMTP permanent and temporary response codes. */
703 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
704 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
705 host->name, host->address, string_printing(buffer));
706 setflag(addr, af_pass_message);
707 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
709 /* The response was 5xx */
711 if (buffer[0] == '5')
713 addr->transport_return = FAIL;
717 /* The response was 4xx */
721 addr->transport_return = DEFER;
722 addr->basic_errno = ERRNO_RCPT4XX;
723 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
725 /* Log temporary errors if there are more hosts to be tried. */
727 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
729 /* Do not put this message on the list of those waiting for specific
730 hosts, as otherwise it is likely to be tried too often. */
732 update_waiting = FALSE;
734 /* Add a retry item for the address so that it doesn't get tried again
735 too soon. If address_retry_include_sender is true, add the sender address
738 if (address_retry_include_sender)
740 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
742 retry_add_item(addr, altkey, 0);
744 else retry_add_item(addr, addr->address_retry_key, 0);
747 } /* Loop for next RCPT response */
749 /* Update where to start at for the next block of responses, unless we
750 have already handled all the addresses. */
752 if (addr != NULL) *sync_addr = addr->next;
754 /* Handle a response to DATA. If we have not had any good recipients, either
755 previously or in this block, the response is ignored. */
757 if (pending_DATA != 0 &&
758 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
763 if (pending_DATA > 0 || (yield & 1) != 0)
765 if (errno == 0 && buffer[0] == '4')
767 errno = ERRNO_DATA4XX;
768 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
772 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
773 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
774 "is in use and there were no good recipients\n", msg);
777 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
778 present) received 3xx. If any RCPTs were handled and yielded anything other
779 than 4xx, yield will be set non-zero. */
786 /*************************************************
787 * Deliver address list to given host *
788 *************************************************/
790 /* If continue_hostname is not null, we get here only when continuing to
791 deliver down an existing channel. The channel was passed as the standard
794 Otherwise, we have to make a connection to the remote host, and do the
795 initial protocol exchange.
797 When running as an MUA wrapper, if the sender or any recipient is rejected,
798 temporarily or permanently, we force failure for all recipients.
801 addrlist chain of potential addresses to deliver; only those whose
802 transport_return field is set to PENDING_DEFER are currently
803 being processed; others should be skipped - they have either
804 been delivered to an earlier host or IP address, or been
805 failed by one of them.
806 host host to deliver to
807 host_af AF_INET or AF_INET6
808 port default TCP/IP port to use, in host byte order
809 interface interface to bind to, or NULL
810 tblock transport instance block
811 copy_host TRUE if host set in addr->host_used must be copied, because
812 it is specific to this call of the transport
813 message_defer set TRUE if yield is OK, but all addresses were deferred
814 because of a non-recipient, non-host failure, that is, a
815 4xx response to MAIL FROM, DATA, or ".". This is a defer
816 that is specific to the message.
817 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
818 a second attempt after TLS initialization fails
820 Returns: OK - the connection was made and the delivery attempted;
821 the result for each address is in its data block.
822 DEFER - the connection could not be made, or something failed
823 while setting up the SMTP session, or there was a
824 non-message-specific error, such as a timeout.
825 ERROR - a filter command is specified for this transport,
826 and there was a problem setting it up; OR helo_data
827 or add_headers or authenticated_sender is specified
828 for this transport, and the string failed to expand
832 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
833 uschar *interface, transport_instance *tblock, BOOL copy_host,
834 BOOL *message_defer, BOOL suppress_tls)
837 address_item *sync_addr;
838 address_item *first_addr = addrlist;
843 time_t start_delivery_time = time(NULL);
844 smtp_transport_options_block *ob =
845 (smtp_transport_options_block *)(tblock->options_block);
846 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
848 BOOL send_rset = TRUE;
849 BOOL send_quit = TRUE;
850 BOOL setting_up = TRUE;
851 BOOL completed_address = FALSE;
854 BOOL pass_message = FALSE;
855 smtp_inblock inblock;
856 smtp_outblock outblock;
857 int max_rcpt = tblock->max_addresses;
858 uschar *igquotstr = US"";
859 uschar *local_authenticated_sender = authenticated_sender;
860 uschar *helo_data = NULL;
861 uschar *message = NULL;
862 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
865 uschar inbuffer[4096];
866 uschar outbuffer[1024];
868 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
870 *message_defer = FALSE;
871 smtp_command = US"initial connection";
872 if (max_rcpt == 0) max_rcpt = 999999;
874 /* Set up the buffer for reading SMTP response packets. */
876 inblock.buffer = inbuffer;
877 inblock.buffersize = sizeof(inbuffer);
878 inblock.ptr = inbuffer;
879 inblock.ptrend = inbuffer;
881 /* Set up the buffer for holding SMTP commands while pipelining */
883 outblock.buffer = outbuffer;
884 outblock.buffersize = sizeof(outbuffer);
885 outblock.ptr = outbuffer;
886 outblock.cmd_count = 0;
887 outblock.authenticating = FALSE;
889 /* If an authenticated_sender override has been specified for this transport
890 instance, expand it. If the expansion is forced to fail, and there was already
891 an authenticated_sender for this message, the original value will be used.
892 Other expansion failures are serious. An empty result is ignored, but there is
893 otherwise no check - this feature is expected to be used with LMTP and other
894 cases where non-standard addresses (e.g. without domains) might be required. */
896 if (ob->authenticated_sender != NULL)
898 uschar *new = expand_string(ob->authenticated_sender);
901 if (!expand_string_forcedfail)
903 uschar *message = string_sprintf("failed to expand "
904 "authenticated_sender: %s", expand_string_message);
905 set_errno(addrlist, 0, message, DEFER, FALSE);
909 else if (new[0] != 0) local_authenticated_sender = new;
912 /* Make a connection to the host if this isn't a continued delivery, and handle
913 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
914 specially so they can be identified for retries. */
916 if (continue_hostname == NULL)
918 inblock.sock = outblock.sock =
919 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
921 if (inblock.sock < 0)
923 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
928 /* Expand the greeting message while waiting for the initial response. (Makes
929 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
930 delayed till here so that $sending_interface and $sending_port are set. */
932 helo_data = expand_string(ob->helo_data);
934 /* The first thing is to wait for an initial OK response. The dreaded "goto"
935 is nevertheless a reasonably clean way of programming this kind of logic,
936 where you want to escape on any error. */
938 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
939 ob->command_timeout)) goto RESPONSE_FAILED;
941 /* Now check if the helo_data expansion went well, and sign off cleanly if it
944 if (helo_data == NULL)
946 uschar *message = string_sprintf("failed to expand helo_data: %s",
947 expand_string_message);
948 set_errno(addrlist, 0, message, DEFER, FALSE);
953 /** Debugging without sending a message
954 addrlist->transport_return = DEFER;
958 /* Errors that occur after this point follow an SMTP command, which is
959 left in big_buffer by smtp_write_command() for use in error messages. */
961 smtp_command = big_buffer;
963 /* Tell the remote who we are...
965 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
966 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
967 greeting is of this form. The assumption was that the far end supports it
968 properly... but experience shows that there are some that give 5xx responses,
969 even though the banner includes "ESMTP" (there's a bloody-minded one that
970 says "ESMTP not spoken here"). Cope with that case.
972 September 2000: Time has passed, and it seems reasonable now to always send
973 EHLO at the start. It is also convenient to make the change while installing
976 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
977 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
978 would be no way to send out the mails, so there is now a host list
979 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
980 PIPELINING problem as well. Maybe it can also be useful to cure other
981 problems with broken servers.
983 Exim originally sent "Helo" at this point and ran for nearly a year that way.
984 Then somebody tried it with a Microsoft mailer... It seems that all other
985 mailers use upper case for some reason (the RFC is quite clear about case
986 independence) so, for peace of mind, I gave in. */
988 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
989 host->name, host->address, NULL) != OK;
993 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
994 lmtp? "LHLO" : "EHLO", helo_data) < 0)
996 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
997 ob->command_timeout))
999 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1006 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1011 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1013 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1014 ob->command_timeout)) goto RESPONSE_FAILED;
1017 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1018 lmtp_ignore_quota option was set. */
1020 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1021 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1022 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1024 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1027 tls_offered = esmtp &&
1028 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1029 PCRE_EOPT, NULL, 0) >= 0;
1033 /* For continuing deliveries down the same channel, the socket is the standard
1034 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1035 below). Set up the pointer to where subsequent commands will be left, for
1036 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1037 set from the command line if they were set in the process that passed the
1042 inblock.sock = outblock.sock = fileno(stdin);
1043 smtp_command = big_buffer;
1046 /* If TLS is available on this connection, whether continued or not, attempt to
1047 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1048 send another EHLO - the server may give a different answer in secure mode. We
1049 use a separate buffer for reading the response to STARTTLS so that if it is
1050 negative, the original EHLO data is available for subsequent analysis, should
1051 the client not be required to use TLS. If the response is bad, copy the buffer
1052 for error analysis. */
1055 if (tls_offered && !suppress_tls &&
1056 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1057 host->address, NULL) != OK)
1059 uschar buffer2[4096];
1060 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1063 /* If there is an I/O error, transmission of this message is deferred. If
1064 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1065 false, we also defer. However, if there is a temporary rejection of STARTTLS
1066 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1067 STARTTLS, we carry on. This means we will try to send the message in clear,
1068 unless the host is in hosts_require_tls (tested below). */
1070 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1071 ob->command_timeout))
1073 Ustrncpy(buffer, buffer2, sizeof(buffer));
1074 if (errno != 0 || buffer2[0] == 0 ||
1075 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1076 goto RESPONSE_FAILED;
1079 /* STARTTLS accepted: try to negotiate a TLS session. */
1083 int rc = tls_client_start(inblock.sock,
1086 NULL, /* No DH param */
1087 ob->tls_certificate,
1089 ob->tls_verify_certificates,
1091 ob->tls_require_ciphers,
1092 ob->gnutls_require_mac,
1093 ob->gnutls_require_kx,
1094 ob->gnutls_require_proto,
1095 ob->command_timeout);
1097 /* TLS negotiation failed; give an error. From outside, this function may
1098 be called again to try in clear on a new connection, if the options permit
1099 it for this host. */
1103 save_errno = ERRNO_TLSFAILURE;
1104 message = US"failure while setting up TLS session";
1109 /* TLS session is set up */
1111 for (addr = addrlist; addr != NULL; addr = addr->next)
1113 if (addr->transport_return == PENDING_DEFER)
1115 addr->cipher = tls_cipher;
1116 addr->peerdn = tls_peerdn;
1122 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1123 helo_data is null, we are dealing with a connection that was passed from
1124 another process, and so we won't have expanded helo_data above. We have to
1125 expand it here. $sending_ip_address and $sending_port are set up right at the
1126 start of the Exim process (in exim.c). */
1128 if (tls_active >= 0)
1130 if (helo_data == NULL)
1132 helo_data = expand_string(ob->helo_data);
1133 if (helo_data == NULL)
1135 uschar *message = string_sprintf("failed to expand helo_data: %s",
1136 expand_string_message);
1137 set_errno(addrlist, 0, message, DEFER, FALSE);
1143 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO",
1146 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1147 ob->command_timeout))
1148 goto RESPONSE_FAILED;
1151 /* If the host is required to use a secure channel, ensure that we
1154 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1155 host->address, NULL) == OK)
1157 save_errno = ERRNO_TLSREQUIRED;
1158 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1159 host->name, host->address,
1160 tls_offered? "an attempt to start TLS failed" :
1161 "the server did not offer TLS support");
1166 /* If TLS is active, we have just started it up and re-done the EHLO command,
1167 so its response needs to be analyzed. If TLS is not active and this is a
1168 continued session down a previously-used socket, we haven't just done EHLO, so
1171 if (continue_hostname == NULL
1178 uschar *fail_reason = US"server did not advertise AUTH support";
1180 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1181 lmtp_ignore_quota option was set. */
1183 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1184 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1185 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1187 /* If the response to EHLO specified support for the SIZE parameter, note
1188 this, provided size_addition is non-negative. */
1190 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1191 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1192 PCRE_EOPT, NULL, 0) >= 0;
1194 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1195 the current host, esmtp will be false, so PIPELINING can never be used. If
1196 the current host matches hosts_avoid_pipelining, don't do it. */
1198 smtp_use_pipelining = esmtp &&
1199 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1200 host->address, NULL) != OK &&
1201 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1202 PCRE_EOPT, NULL, 0) >= 0;
1204 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1205 smtp_use_pipelining? "" : "not ");
1207 /* Note if the response to EHLO specifies support for the AUTH extension.
1208 If it has, check that this host is one we want to authenticate to, and do
1209 the business. The host name and address must be available when the
1210 authenticator's client driver is running. */
1212 smtp_authenticated = FALSE;
1213 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1214 host->name, host->address, NULL);
1216 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1218 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1219 expand_nmax = -1; /* reset */
1221 /* Must not do this check until after we have saved the result of the
1222 regex match above. */
1224 if (require_auth == OK ||
1225 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1226 host->address, NULL) == OK)
1229 fail_reason = US"no common mechanisms were found";
1231 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1233 /* Scan the configured authenticators looking for one which is configured
1234 for use as a client and whose name matches an authentication mechanism
1235 supported by the server. If one is found, attempt to authenticate by
1236 calling its client function. */
1238 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1241 if (!au->client) continue;
1243 /* Loop to scan supported server mechanisms */
1248 int len = Ustrlen(au->public_name);
1249 while (isspace(*p)) p++;
1251 if (strncmpic(au->public_name, p, len) != 0 ||
1252 (p[len] != 0 && !isspace(p[len])))
1254 while (*p != 0 && !isspace(*p)) p++;
1258 /* Found data for a listed mechanism. Call its client entry. Set
1259 a flag in the outblock so that data is overwritten after sending so
1260 that reflections don't show it. */
1262 fail_reason = US"authentication attempt(s) failed";
1263 outblock.authenticating = TRUE;
1264 rc = (au->info->clientcode)(au, &inblock, &outblock,
1265 ob->command_timeout, buffer, sizeof(buffer));
1266 outblock.authenticating = FALSE;
1267 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1270 /* A temporary authentication failure must hold up delivery to
1271 this host. After a permanent authentication failure, we carry on
1272 to try other authentication methods. If all fail hard, try to
1273 deliver the message unauthenticated unless require_auth was set. */
1278 smtp_authenticated = TRUE; /* stops the outer loop */
1281 /* Failure after writing a command */
1286 /* Failure after reading a response */
1289 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1290 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1291 au->name, host->name, host->address, buffer);
1294 /* Failure by some other means. In effect, the authenticator
1295 decided it wasn't prepared to handle this case. Typically this
1296 is the result of "fail" in an expansion string. Do we need to
1297 log anything here? Feb 2006: a message is now put in the buffer
1298 if logging is required. */
1302 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1303 "authentication H=%s [%s] %s", au->name, host->name,
1304 host->address, buffer);
1307 /* Internal problem, message in buffer. */
1311 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1315 break; /* If not authenticated, try next authenticator */
1316 } /* Loop for scanning supported server mechanisms */
1317 } /* Loop for further authenticators */
1321 /* If we haven't authenticated, but are required to, give up. */
1323 if (require_auth == OK && !smtp_authenticated)
1326 set_errno(addrlist, ERRNO_AUTHFAIL,
1327 string_sprintf("authentication required but %s", fail_reason), DEFER,
1333 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1334 message-specific. */
1338 /* If there is a filter command specified for this transport, we can now
1339 set it up. This cannot be done until the identify of the host is known. */
1341 if (tblock->filter_command != NULL)
1345 sprintf(CS buffer, "%.50s transport", tblock->name);
1346 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1347 TRUE, DEFER, addrlist, buffer, NULL);
1349 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1354 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1362 /* For messages that have more than the maximum number of envelope recipients,
1363 we want to send several transactions down the same SMTP connection. (See
1364 comments in deliver.c as to how this reconciles, heuristically, with
1365 remote_max_parallel.) This optimization was added to Exim after the following
1366 code was already working. The simplest way to put it in without disturbing the
1367 code was to use a goto to jump back to this point when there is another
1368 transaction to handle. */
1371 sync_addr = first_addr;
1375 completed_address = FALSE;
1378 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1379 qualification, send it, adding something to the message size to allow for
1380 imprecision and things that get added en route. Exim keeps the number of lines
1381 in a message, so we can give an accurate value for the original message, but we
1382 need some additional to handle added headers. (Double "." characters don't get
1383 included in the count.) */
1390 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1394 /* Add the authenticated sender address if present */
1396 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1397 local_authenticated_sender != NULL)
1399 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1400 auth_xtextencode(local_authenticated_sender,
1401 Ustrlen(local_authenticated_sender)));
1404 /* From here until we send the DATA command, we can make use of PIPELINING
1405 if the server host supports it. The code has to be able to check the responses
1406 at any point, for when the buffer fills up, so we write it totally generally.
1407 When PIPELINING is off, each command written reports that it has flushed the
1410 pending_MAIL = TRUE; /* The block starts with MAIL */
1412 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1413 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1414 mail_command = string_copy(big_buffer); /* Save for later error message */
1418 case -1: /* Transmission error */
1421 case +1: /* Block was sent */
1422 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1423 ob->command_timeout))
1425 if (errno == 0 && buffer[0] == '4')
1427 errno = ERRNO_MAIL4XX;
1428 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1430 goto RESPONSE_FAILED;
1432 pending_MAIL = FALSE;
1436 /* Pass over all the relevant recipient addresses for this host, which are the
1437 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1438 several before we have to read the responses for those seen so far. This
1439 checking is done by a subroutine because it also needs to be done at the end.
1440 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1441 the next one if not all are sent.
1443 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1444 last address because we want to abort if any recipients have any kind of
1445 problem, temporary or permanent. We know that all recipient addresses will have
1446 the PENDING_DEFER status, because only one attempt is ever made, and we know
1447 that max_rcpt will be large, so all addresses will be done at once. */
1449 for (addr = first_addr;
1450 address_count < max_rcpt && addr != NULL;
1456 if (addr->transport_return != PENDING_DEFER) continue;
1459 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1461 /* Now send the RCPT command, and process outstanding responses when
1462 necessary. After a timeout on RCPT, we just end the function, leaving the
1463 yield as OK, because this error can often mean that there is a problem with
1464 just one address, so we don't want to delay the host. */
1466 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1467 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1468 if (count < 0) goto SEND_FAILED;
1471 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1472 &sync_addr, host, count, ob->address_retry_include_sender,
1473 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1476 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1477 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1480 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1481 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1482 case 0: /* No 2xx or 5xx, but no probs */
1485 case -1: goto END_OFF; /* Timeout on RCPT */
1486 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1488 pending_MAIL = FALSE; /* Dealt with MAIL */
1490 } /* Loop for next address */
1492 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1493 permanently or temporarily. We should have flushed and synced after the last
1498 address_item *badaddr;
1499 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1501 if (badaddr->transport_return != PENDING_OK) break;
1503 if (badaddr != NULL)
1505 set_errno(addrlist, 0, badaddr->message, FAIL,
1506 testflag(badaddr, af_pass_message));
1511 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1512 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1513 have a good recipient buffered up if we are pipelining. We don't want to waste
1514 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1515 are pipelining. The responses are all handled by sync_responses(). */
1517 if (ok || (smtp_use_pipelining && !mua_wrapper))
1519 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1520 if (count < 0) goto SEND_FAILED;
1521 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1522 host, count, ob->address_retry_include_sender, pending_MAIL,
1523 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1525 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1526 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1529 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1530 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1531 case 0: break; /* No 2xx or 5xx, but no probs */
1533 case -1: goto END_OFF; /* Timeout on RCPT */
1534 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1538 /* Save the first address of the next batch. */
1542 /* If there were no good recipients (but otherwise there have been no
1543 problems), just set ok TRUE, since we have handled address-specific errors
1544 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1545 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1546 well as body. Set the appropriate timeout value to be used for each chunk.
1547 (Haven't been able to make it work using select() for writing yet.) */
1549 if (!ok) ok = TRUE; else
1551 sigalrm_seen = FALSE;
1552 transport_write_timeout = ob->data_timeout;
1553 smtp_command = US"sending data block"; /* For error messages */
1554 DEBUG(D_transport|D_v)
1555 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1556 transport_count = 0;
1557 #ifdef EXPERIMENTAL_DOMAINKEYS
1558 if ( (ob->dk_private_key != NULL) && (ob->dk_selector != NULL) )
1559 ok = dk_transport_write_message(addrlist, inblock.sock,
1560 topt_use_crlf | topt_end_dot | topt_escape_headers |
1561 (tblock->body_only? topt_no_headers : 0) |
1562 (tblock->headers_only? topt_no_body : 0) |
1563 (tblock->return_path_add? topt_add_return_path : 0) |
1564 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1565 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1566 0, /* No size limit */
1567 tblock->add_headers, tblock->remove_headers,
1568 US".", US"..", /* Escaping strings */
1569 tblock->rewrite_rules, tblock->rewrite_existflags,
1570 ob->dk_private_key, ob->dk_domain, ob->dk_selector,
1571 ob->dk_canon, ob->dk_headers, ob->dk_strict);
1574 ok = transport_write_message(addrlist, inblock.sock,
1575 topt_use_crlf | topt_end_dot | topt_escape_headers |
1576 (tblock->body_only? topt_no_headers : 0) |
1577 (tblock->headers_only? topt_no_body : 0) |
1578 (tblock->return_path_add? topt_add_return_path : 0) |
1579 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1580 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1581 0, /* No size limit */
1582 tblock->add_headers, tblock->remove_headers,
1583 US".", US"..", /* Escaping strings */
1584 tblock->rewrite_rules, tblock->rewrite_existflags);
1586 /* transport_write_message() uses write() because it is called from other
1587 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1588 it can exit with "Broken pipe" as its error. This really means that the
1589 socket got closed at the far end. */
1591 transport_write_timeout = 0; /* for subsequent transports */
1593 /* Failure can either be some kind of I/O disaster (including timeout),
1594 or the failure of a transport filter or the expansion of added headers. */
1598 buffer[0] = 0; /* There hasn't been a response */
1599 goto RESPONSE_FAILED;
1602 /* We used to send the terminating "." explicitly here, but because of
1603 buffering effects at both ends of TCP/IP connections, you don't gain
1604 anything by keeping it separate, so it might as well go in the final
1605 data buffer for efficiency. This is now done by setting the topt_end_dot
1608 smtp_command = US"end of data";
1610 /* For SMTP, we now read a single response that applies to the whole message.
1611 If it is OK, then all the addresses have been delivered. */
1615 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1617 if (!ok && errno == 0 && buffer[0] == '4')
1619 errno = ERRNO_DATA4XX;
1620 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1624 /* For LMTP, we get back a response for every RCPT command that we sent;
1625 some may be accepted and some rejected. For those that get a response, their
1626 status is fixed; any that are accepted have been handed over, even if later
1627 responses crash - at least, that's how I read RFC 2033.
1629 If all went well, mark the recipient addresses as completed, record which
1630 host/IPaddress they were delivered to, and cut out RSET when sending another
1631 message down the same channel. Write the completed addresses to the journal
1632 now so that they are recorded in case there is a crash of hardware or
1633 software before the spool gets updated. Also record the final SMTP
1634 confirmation if needed (for SMTP only). */
1639 int delivery_time = (int)(time(NULL) - start_delivery_time);
1642 uschar *conf = NULL;
1645 /* Make a copy of the host if it is local to this invocation
1646 of the transport. */
1650 thost = store_get(sizeof(host_item));
1652 thost->name = string_copy(host->name);
1653 thost->address = string_copy(host->address);
1657 /* Set up confirmation if needed - applies only to SMTP */
1659 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1661 uschar *s = string_printing(buffer);
1662 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1665 /* Process all transported addresses - for LMTP, read a status for
1668 for (addr = addrlist; addr != first_addr; addr = addr->next)
1670 if (addr->transport_return != PENDING_OK) continue;
1672 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1673 remaining addresses. Otherwise, it's a return code for just the one
1674 address. For temporary errors, add a retry item for the address so that
1675 it doesn't get tried again too soon. */
1679 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1682 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1683 addr->message = string_sprintf("LMTP error after %s: %s",
1684 big_buffer, string_printing(buffer));
1685 setflag(addr, af_pass_message); /* Allow message to go to user */
1686 if (buffer[0] == '5')
1687 addr->transport_return = FAIL;
1690 errno = ERRNO_DATA4XX;
1691 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1692 addr->transport_return = DEFER;
1693 retry_add_item(addr, addr->address_retry_key, 0);
1697 completed_address = TRUE; /* NOW we can set this flag */
1700 /* SMTP, or success return from LMTP for this address. Pass back the
1701 actual host that was used. */
1703 addr->transport_return = OK;
1704 addr->more_errno = delivery_time;
1705 addr->host_used = thost;
1706 addr->special_action = flag;
1707 addr->message = conf;
1710 /* Update the journal. For homonymic addresses, use the base address plus
1711 the transport name. See lots of comments in deliver.c about the reasons
1712 for the complications when homonyms are involved. Just carry on after
1713 write error, as it may prove possible to update the spool file later. */
1715 if (testflag(addr, af_homonym))
1716 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1718 sprintf(CS buffer, "%.500s\n", addr->unique);
1720 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1721 len = Ustrlen(CS buffer);
1722 if (write(journal_fd, buffer, len) != len)
1723 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1724 "%s: %s", buffer, strerror(errno));
1727 /* Ensure the journal file is pushed out to disk. */
1729 if (EXIMfsync(journal_fd) < 0)
1730 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1736 /* Handle general (not specific to one address) failures here. The value of ok
1737 is used to skip over this code on the falling through case. A timeout causes a
1738 deferral. Other errors may defer or fail according to the response code, and
1739 may set up a special errno value, e.g. after connection chopped, which is
1740 assumed if errno == 0 and there is no text in the buffer. If control reaches
1741 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1742 the problem is not related to this specific message. */
1751 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1752 buffer, &code, &message, &pass_message);
1758 message = US string_sprintf("send() to %s [%s] failed: %s",
1759 host->name, host->address, strerror(save_errno));
1763 /* This label is jumped to directly when a TLS negotiation has failed,
1764 or was not done for a host for which it is required. Values will be set
1765 in message and save_errno, and setting_up will always be true. Treat as
1766 a temporary error. */
1773 /* If the failure happened while setting up the call, see if the failure was
1774 a 5xx response (this will either be on connection, or following HELO - a 5xx
1775 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1776 never going to accept them. For other errors during setting up (timeouts or
1777 whatever), defer all addresses, and yield DEFER, so that the host is not
1778 tried again for a while. */
1781 ok = FALSE; /* For when reached by GOTO */
1787 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1791 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1796 /* We want to handle timeouts after MAIL or "." and loss of connection after
1797 "." specially. They can indicate a problem with the sender address or with
1798 the contents of the message rather than a real error on the connection. These
1799 cases are treated in the same way as a 4xx response. This next bit of code
1800 does the classification. */
1811 message_error = TRUE;
1815 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1816 Ustrncmp(smtp_command,"end ",4) == 0;
1819 case ERRNO_SMTPCLOSED:
1820 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1824 message_error = FALSE;
1828 /* Handle the cases that are treated as message errors. These are:
1830 (a) negative response or timeout after MAIL
1831 (b) negative response after DATA
1832 (c) negative response or timeout or dropped connection after "."
1834 It won't be a negative response or timeout after RCPT, as that is dealt
1835 with separately above. The action in all cases is to set an appropriate
1836 error code for all the addresses, but to leave yield set to OK because the
1837 host itself has not failed. Of course, it might in practice have failed
1838 when we've had a timeout, but if so, we'll discover that at the next
1839 delivery attempt. For a temporary error, set the message_defer flag, and
1840 write to the logs for information if this is not the last host. The error
1841 for the last host will be logged as part of the address's log line. */
1845 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1846 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1849 /* If there's an errno, the message contains just the identity of
1852 if (code != '5') /* Anything other than 5 is treated as temporary */
1855 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1856 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1857 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1858 *message_defer = TRUE;
1862 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1863 ".", or some other transportation error. We defer all addresses and yield
1864 DEFER, except for the case of failed add_headers expansion, or a transport
1865 filter failure, when the yield should be ERROR, to stop it trying other
1870 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1871 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1872 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1878 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1879 SMTP session tidily. However, if there were too many addresses to send in one
1880 message (indicated by first_addr being non-NULL) we want to carry on with the
1881 rest of them. Also, it is desirable to send more than one message down the SMTP
1882 connection if there are several waiting, provided we haven't already sent so
1883 many as to hit the configured limit. The function transport_check_waiting looks
1884 for a waiting message and returns its id. Then transport_pass_socket tries to
1885 set up a continued delivery by passing the socket on to another process. The
1886 variable send_rset is FALSE if a message has just been successfully transfered.
1888 If we are already sending down a continued channel, there may be further
1889 addresses not yet delivered that are aimed at the same host, but which have not
1890 been passed in this run of the transport. In this case, continue_more will be
1891 true, and all we should do is send RSET if necessary, and return, leaving the
1894 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1895 do not want to continue with other messages down the same channel, because that
1896 can lead to looping between two or more messages, all with the same,
1897 temporarily failing address(es). [The retry information isn't updated yet, so
1898 new processes keep on trying.] We probably also don't want to try more of this
1899 message's addresses either.
1901 If we have started a TLS session, we have to end it before passing the
1902 connection to a new process. However, not all servers can handle this (Exim
1903 can), so we do not pass such a connection on if the host matches
1904 hosts_nopass_tls. */
1907 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
1908 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
1909 continue_more, yield, (first_addr == NULL)? "":"not ");
1911 if (completed_address && ok && send_quit)
1914 if (first_addr != NULL || continue_more ||
1917 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
1918 host->address, NULL) != OK)
1920 transport_check_waiting(tblock->name, host->name,
1921 tblock->connection_max_messages, new_message_id, &more)
1929 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
1931 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
1932 host->address, strerror(save_errno));
1935 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1936 ob->command_timeout)))
1939 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
1943 DEBUG(D_transport) debug_printf("%s\n", msg);
1948 /* Either RSET was not needed, or it succeeded */
1952 if (first_addr != NULL) /* More addresses still to be sent */
1953 { /* in this run of the transport */
1954 continue_sequence++; /* Causes * in logging */
1957 if (continue_more) return yield; /* More addresses for another run */
1959 /* Pass the socket to a new Exim process. Before doing so, we must shut
1960 down TLS. Not all MTAs allow for the continuation of the SMTP session
1961 when TLS is shut down. We test for this by sending a new EHLO. If we
1962 don't get a good response, we don't attempt to pass the socket on. */
1965 if (tls_active >= 0)
1968 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
1969 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1970 ob->command_timeout);
1974 /* If the socket is successfully passed, we musn't send QUIT (or
1975 indeed anything!) from here. */
1977 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
1978 new_message_id, inblock.sock))
1984 /* If RSET failed and there are addresses left, they get deferred. */
1986 else set_errno(first_addr, errno, msg, DEFER, FALSE);
1990 /* End off tidily with QUIT unless the connection has died or the socket has
1991 been passed to another process. There has been discussion on the net about what
1992 to do after sending QUIT. The wording of the RFC suggests that it is necessary
1993 to wait for a response, but on the other hand, there isn't anything one can do
1994 with an error response, other than log it. Exim used to do that. However,
1995 further discussion suggested that it is positively advantageous not to wait for
1996 the response, but to close the session immediately. This is supposed to move
1997 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
1998 load from the server. (Hosts that are both servers and clients may not see much
1999 difference, of course.) Further discussion indicated that this was safe to do
2000 on Unix systems which have decent implementations of TCP/IP that leave the
2001 connection around for a while (TIME_WAIT) after the application has gone away.
2002 This enables the response sent by the server to be properly ACKed rather than
2003 timed out, as can happen on broken TCP/IP implementations on other OS.
2005 This change is being made on 31-Jul-98. After over a year of trouble-free
2006 operation, the old commented-out code was removed on 17-Sep-99. */
2009 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2017 /* Close the socket, and return the appropriate value, first setting
2018 continue_transport and continue_hostname NULL to prevent any other addresses
2019 that may include the host from trying to re-use a continuation socket. This
2020 works because the NULL setting is passed back to the calling process, and
2021 remote_max_parallel is forced to 1 when delivering over an existing connection,
2023 If all went well and continue_more is set, we shouldn't actually get here if
2024 there are further addresses, as the return above will be taken. However,
2025 writing RSET might have failed, or there may be other addresses whose hosts are
2026 specified in the transports, and therefore not visible at top level, in which
2027 case continue_more won't get set. */
2029 (void)close(inblock.sock);
2030 continue_transport = NULL;
2031 continue_hostname = NULL;
2038 /*************************************************
2039 * Closedown entry point *
2040 *************************************************/
2042 /* This function is called when exim is passed an open smtp channel
2043 from another incarnation, but the message which it has been asked
2044 to deliver no longer exists. The channel is on stdin.
2046 We might do fancy things like looking for another message to send down
2047 the channel, but if the one we sought has gone, it has probably been
2048 delivered by some other process that itself will seek further messages,
2049 so just close down our connection.
2051 Argument: pointer to the transport instance block
2056 smtp_transport_closedown(transport_instance *tblock)
2058 smtp_transport_options_block *ob =
2059 (smtp_transport_options_block *)(tblock->options_block);
2060 smtp_inblock inblock;
2061 smtp_outblock outblock;
2063 uschar inbuffer[4096];
2064 uschar outbuffer[16];
2066 inblock.sock = fileno(stdin);
2067 inblock.buffer = inbuffer;
2068 inblock.buffersize = sizeof(inbuffer);
2069 inblock.ptr = inbuffer;
2070 inblock.ptrend = inbuffer;
2072 outblock.sock = inblock.sock;
2073 outblock.buffersize = sizeof(outbuffer);
2074 outblock.buffer = outbuffer;
2075 outblock.ptr = outbuffer;
2076 outblock.cmd_count = 0;
2077 outblock.authenticating = FALSE;
2079 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2080 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2081 ob->command_timeout);
2082 (void)close(inblock.sock);
2087 /*************************************************
2088 * Prepare addresses for delivery *
2089 *************************************************/
2091 /* This function is called to flush out error settings from previous delivery
2092 attempts to other hosts. It also records whether we got here via an MX record
2093 or not in the more_errno field of the address. We are interested only in
2094 addresses that are still marked DEFER - others may have got delivered to a
2095 previously considered IP address. Set their status to PENDING_DEFER to indicate
2096 which ones are relevant this time.
2099 addrlist the list of addresses
2100 host the host we are delivering to
2102 Returns: the first address for this delivery
2105 static address_item *
2106 prepare_addresses(address_item *addrlist, host_item *host)
2108 address_item *first_addr = NULL;
2110 for (addr = addrlist; addr != NULL; addr = addr->next)
2112 if (addr->transport_return != DEFER) continue;
2113 if (first_addr == NULL) first_addr = addr;
2114 addr->transport_return = PENDING_DEFER;
2115 addr->basic_errno = 0;
2116 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2117 addr->message = NULL;
2119 addr->cipher = NULL;
2120 addr->peerdn = NULL;
2128 /*************************************************
2129 * Main entry point *
2130 *************************************************/
2132 /* See local README for interface details. As this is a remote transport, it is
2133 given a chain of addresses to be delivered in one connection, if possible. It
2134 always returns TRUE, indicating that each address has its own independent
2135 status set, except if there is a setting up problem, in which case it returns
2139 smtp_transport_entry(
2140 transport_instance *tblock, /* data for this instantiation */
2141 address_item *addrlist) /* addresses we are working on */
2145 int hosts_defer = 0;
2147 int hosts_looked_up = 0;
2148 int hosts_retry = 0;
2149 int hosts_serial = 0;
2150 int hosts_total = 0;
2151 int total_hosts_tried = 0;
2153 BOOL expired = TRUE;
2154 BOOL continuing = continue_hostname != NULL;
2155 uschar *expanded_hosts = NULL;
2157 uschar *tid = string_sprintf("%s transport", tblock->name);
2158 smtp_transport_options_block *ob =
2159 (smtp_transport_options_block *)(tblock->options_block);
2160 host_item *hostlist = addrlist->host_list;
2161 host_item *host = NULL;
2165 debug_printf("%s transport entered\n", tblock->name);
2166 for (addr = addrlist; addr != NULL; addr = addr->next)
2167 debug_printf(" %s\n", addr->address);
2168 if (continuing) debug_printf("already connected to %s [%s]\n",
2169 continue_hostname, continue_host_address);
2172 /* Set the flag requesting that these hosts be added to the waiting
2173 database if the delivery fails temporarily or if we are running with
2174 queue_smtp or a 2-stage queue run. This gets unset for certain
2175 kinds of error, typically those that are specific to the message. */
2177 update_waiting = TRUE;
2179 /* If a host list is not defined for the addresses - they must all have the
2180 same one in order to be passed to a single transport - or if the transport has
2181 a host list with hosts_override set, use the host list supplied with the
2182 transport. It is an error for this not to exist. */
2184 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2186 if (ob->hosts == NULL)
2188 addrlist->message = string_sprintf("%s transport called with no hosts set",
2190 addrlist->transport_return = PANIC;
2191 return FALSE; /* Only top address has status */
2194 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2197 /* If the transport's host list contains no '$' characters, and we are not
2198 randomizing, it is fixed and therefore a chain of hosts can be built once
2199 and for all, and remembered for subsequent use by other calls to this
2200 transport. If, on the other hand, the host list does contain '$', or we are
2201 randomizing its order, we have to rebuild it each time. In the fixed case,
2202 as the hosts string will never be used again, it doesn't matter that we
2203 replace all the : characters with zeros. */
2205 if (ob->hostlist == NULL)
2207 uschar *s = ob->hosts;
2209 if (Ustrchr(s, '$') != NULL)
2211 expanded_hosts = expand_string(s);
2212 if (expanded_hosts == NULL)
2214 addrlist->message = string_sprintf("failed to expand list of hosts "
2215 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2216 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2217 return FALSE; /* Only top address has status */
2219 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2220 "\"%s\"\n", s, expanded_hosts);
2224 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2226 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2228 /* If there was no expansion of hosts, save the host list for
2231 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2234 /* This is not the first time this transport has been run in this delivery;
2235 the host list was built previously. */
2237 else hostlist = ob->hostlist;
2240 /* The host list was supplied with the address. If hosts_randomize is set, we
2241 must sort it into a random order if it did not come from MX records and has not
2242 already been randomized (but don't bother if continuing down an existing
2245 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2247 host_item *newlist = NULL;
2248 while (hostlist != NULL)
2250 host_item *h = hostlist;
2251 hostlist = hostlist->next;
2253 h->sort_key = random_number(100);
2255 if (newlist == NULL)
2260 else if (h->sort_key < newlist->sort_key)
2267 host_item *hh = newlist;
2268 while (hh->next != NULL)
2270 if (h->sort_key < hh->next->sort_key) break;
2278 hostlist = addrlist->host_list = newlist;
2282 /* Sort out the default port. */
2284 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2287 /* For each host-plus-IP-address on the list:
2289 . If this is a continued delivery and the host isn't the one with the
2290 current connection, skip.
2292 . If the status is unusable (i.e. previously failed or retry checked), skip.
2294 . If no IP address set, get the address, either by turning the name into
2295 an address, calling gethostbyname if gethostbyname is on, or by calling
2296 the DNS. The DNS may yield multiple addresses, in which case insert the
2297 extra ones into the list.
2299 . Get the retry data if not previously obtained for this address and set the
2300 field which remembers the state of this address. Skip if the retry time is
2301 not reached. If not, remember whether retry data was found. The retry string
2302 contains both the name and the IP address.
2304 . Scan the list of addresses and mark those whose status is DEFER as
2305 PENDING_DEFER. These are the only ones that will be processed in this cycle
2308 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2309 Some addresses may be successfully delivered, others may fail, and yet
2310 others may get temporary errors and so get marked DEFER.
2312 . The return from the delivery attempt is OK if a connection was made and a
2313 valid SMTP dialogue was completed. Otherwise it is DEFER.
2315 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2317 . If fail to connect, or other defer state, add a retry item.
2319 . If there are any addresses whose status is still DEFER, carry on to the
2320 next host/IPaddress, unless we have tried the number of hosts given
2321 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2322 there is some fancy logic for hosts_max_try that means its limit can be
2323 overstepped in some circumstances.
2325 If we get to the end of the list, all hosts have deferred at least one address,
2326 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2327 delivery attempt to those hosts whose last try was before the arrival time of
2328 the current message. To cope with this, we have to go round the loop a second
2329 time. After that, set the status and error data for any addresses that haven't
2330 had it set already. */
2332 for (cutoff_retry = 0; expired &&
2333 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2336 host_item *nexthost = NULL;
2337 int unexpired_hosts_tried = 0;
2339 for (host = hostlist;
2341 unexpired_hosts_tried < ob->hosts_max_try &&
2342 total_hosts_tried < ob->hosts_max_try_hardlimit;
2348 BOOL serialized = FALSE;
2349 BOOL host_is_expired = FALSE;
2350 BOOL message_defer = FALSE;
2351 BOOL ifchanges = FALSE;
2352 BOOL some_deferred = FALSE;
2353 address_item *first_addr = NULL;
2354 uschar *interface = NULL;
2355 uschar *retry_host_key = NULL;
2356 uschar *retry_message_key = NULL;
2357 uschar *serialize_key = NULL;
2359 /* Default next host is next host. :-) But this can vary if the
2360 hosts_max_try limit is hit (see below). It may also be reset if a host
2361 address is looked up here (in case the host was multihomed). */
2363 nexthost = host->next;
2365 /* If the address hasn't yet been obtained from the host name, look it up
2366 now, unless the host is already marked as unusable. If it is marked as
2367 unusable, it means that the router was unable to find its IP address (in
2368 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2369 the lookup failed last time. We don't get this far if *all* MX records
2370 point to non-existent hosts; that is treated as a hard error.
2372 We can just skip this host entirely. When the hosts came from the router,
2373 the address will timeout based on the other host(s); when the address is
2374 looked up below, there is an explicit retry record added.
2376 Note that we mustn't skip unusable hosts if the address is not unset; they
2377 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2379 if (host->address == NULL)
2381 int new_port, flags;
2383 uschar *canonical_name;
2385 if (host->status >= hstatus_unusable)
2387 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2392 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2394 /* The host name is permitted to have an attached port. Find it, and
2395 strip it from the name. Just remember it for now. */
2397 new_port = host_item_get_port(host);
2399 /* Count hosts looked up */
2403 /* Find by name if so configured, or if it's an IP address. We don't
2404 just copy the IP address, because we need the test-for-local to happen. */
2406 flags = HOST_FIND_BY_A;
2407 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2408 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2410 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2411 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2413 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2414 &canonical_name, NULL);
2416 /* Update the host (and any additional blocks, resulting from
2417 multihoming) with a host-specific port, if any. */
2419 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2421 /* Failure to find the host at this time (usually DNS temporary failure)
2422 is really a kind of routing failure rather than a transport failure.
2423 Therefore we add a retry item of the routing kind, not to stop us trying
2424 to look this name up here again, but to ensure the address gets timed
2425 out if the failures go on long enough. A complete failure at this point
2426 commonly points to a configuration error, but the best action is still
2427 to carry on for the next host. */
2429 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2431 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2433 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2434 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2435 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2436 host->status = hstatus_unusable;
2438 for (addr = addrlist; addr != NULL; addr = addr->next)
2440 if (addr->transport_return != DEFER) continue;
2441 addr->basic_errno = ERRNO_UNKNOWNHOST;
2443 string_sprintf("failed to lookup IP address for %s", host->name);
2448 /* If the host is actually the local host, we may have a problem, or
2449 there may be some cunning configuration going on. In the problem case,
2450 log things and give up. The default transport status is already DEFER. */
2452 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2454 for (addr = addrlist; addr != NULL; addr = addr->next)
2456 addr->basic_errno = 0;
2457 addr->message = string_sprintf("%s transport found host %s to be "
2458 "local", tblock->name, host->name);
2462 } /* End of block for IP address lookup */
2464 /* If this is a continued delivery, we are interested only in the host
2465 which matches the name of the existing open channel. The check is put
2466 here after the local host lookup, in case the name gets expanded as a
2467 result of the lookup. Set expired FALSE, to save the outer loop executing
2470 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2471 Ustrcmp(continue_host_address, host->address) != 0))
2474 continue; /* With next host */
2477 /* Reset the default next host in case a multihomed host whose addresses
2478 are not looked up till just above added to the host list. */
2480 nexthost = host->next;
2482 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2483 domain is in queue_smtp_domains, we don't actually want to attempt any
2484 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2485 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2486 were not in it. We don't want to hold up all SMTP deliveries! Except when
2487 doing a two-stage queue run, don't do this if forcing. */
2489 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2490 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2491 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2494 for (addr = addrlist; addr != NULL; addr = addr->next)
2496 if (addr->transport_return != DEFER) continue;
2497 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2499 continue; /* With next host */
2502 /* Count hosts being considered - purely for an intelligent comment
2503 if none are usable. */
2507 /* Set $host and $host address now in case they are needed for the
2508 interface expansion or the serialize_hosts check; they remain set if an
2509 actual delivery happens. */
2511 deliver_host = host->name;
2512 deliver_host_address = host->address;
2514 /* Set up a string for adding to the retry key if the port number is not
2515 the standard SMTP port. A host may have its own port setting that overrides
2518 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2520 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2522 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2523 string changes upon expansion, we must add it to the key that is used for
2524 retries, because connections to the same host from a different interface
2525 should be treated separately. */
2527 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2528 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2531 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2533 /* The first time round the outer loop, check the status of the host by
2534 inspecting the retry data. The second time round, we are interested only
2535 in expired hosts that haven't been tried since this message arrived. */
2537 if (cutoff_retry == 0)
2539 /* Ensure the status of the address is set by checking retry data if
2540 necessary. There maybe host-specific retry data (applicable to all
2541 messages) and also data for retries of a specific message at this host.
2542 If either of these retry records are actually read, the keys used are
2543 returned to save recomputing them later. */
2545 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2546 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2548 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2549 (host->address == NULL)? US"" : host->address, pistring,
2550 (host->status == hstatus_usable)? "usable" :
2551 (host->status == hstatus_unusable)? "unusable" :
2552 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2554 /* Skip this address if not usable at this time, noting if it wasn't
2555 actually expired, both locally and in the address. */
2557 switch (host->status)
2559 case hstatus_unusable:
2561 setflag(addrlist, af_retry_skipped);
2564 case hstatus_unusable_expired:
2567 case hwhy_retry: hosts_retry++; break;
2568 case hwhy_failed: hosts_fail++; break;
2569 case hwhy_deferred: hosts_defer++; break;
2572 /* If there was a retry message key, implying that previously there
2573 was a message-specific defer, we don't want to update the list of
2574 messages waiting for these hosts. */
2576 if (retry_message_key != NULL) update_waiting = FALSE;
2577 continue; /* With the next host or IP address */
2581 /* Second time round the loop: if the address is set but expired, and
2582 the message is newer than the last try, let it through. */
2586 if (host->address == NULL ||
2587 host->status != hstatus_unusable_expired ||
2588 host->last_try > received_time)
2591 debug_printf("trying expired host %s [%s]%s\n",
2592 host->name, host->address, pistring);
2593 host_is_expired = TRUE;
2596 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2597 it remains TRUE only if all hosts are expired and none are actually tried.
2602 /* If this host is listed as one to which access must be serialized,
2603 see if another Exim process has a connection to it, and if so, skip
2604 this host. If not, update the database to record our connection to it
2605 and remember this for later deletion. Do not do any of this if we are
2606 sending the message down a pre-existing connection. */
2609 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2610 host->address, NULL) == OK)
2612 serialize_key = string_sprintf("host-serialize-%s", host->name);
2613 if (!enq_start(serialize_key))
2616 debug_printf("skipping host %s because another Exim process "
2617 "is connected to it\n", host->name);
2624 /* OK, we have an IP address that is not waiting for its retry time to
2625 arrive (it might be expired) OR (second time round the loop) we have an
2626 expired host that hasn't been tried since the message arrived. Have a go
2627 at delivering the message to it. First prepare the addresses by flushing
2628 out the result of previous attempts, and finding the first address that
2629 is still to be delivered. */
2631 first_addr = prepare_addresses(addrlist, host);
2633 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2634 message_id, host->name, host->address, addrlist->address,
2635 (addrlist->next == NULL)? "" : ", ...");
2637 set_process_info("delivering %s to %s [%s] (%s%s)",
2638 message_id, host->name, host->address, addrlist->address,
2639 (addrlist->next == NULL)? "" : ", ...");
2641 /* This is not for real; don't do the delivery. If there are
2642 any remaining hosts, list them. */
2647 set_errno(addrlist, 0, NULL, OK, FALSE);
2648 for (addr = addrlist; addr != NULL; addr = addr->next)
2650 addr->host_used = host;
2651 addr->special_action = '*';
2652 addr->message = US"delivery bypassed by -N option";
2656 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2657 "*** host and remaining hosts:\n", tblock->name);
2658 for (host2 = host; host2 != NULL; host2 = host2->next)
2659 debug_printf(" %s [%s]\n", host2->name,
2660 (host2->address == NULL)? US"unset" : host2->address);
2665 /* This is for real. If the host is expired, we don't count it for
2666 hosts_max_retry. This ensures that all hosts must expire before an address
2667 is timed out, unless hosts_max_try_hardlimit (which protects against
2668 lunatic DNS configurations) is reached.
2670 If the host is not expired and we are about to hit the hosts_max_retry
2671 limit, check to see if there is a subsequent hosts with a different MX
2672 value. If so, make that the next host, and don't count this one. This is a
2673 heuristic to make sure that different MXs do get tried. With a normal kind
2674 of retry rule, they would get tried anyway when the earlier hosts were
2675 delayed, but if the domain has a "retry every time" type of rule - as is
2676 often used for the the very large ISPs, that won't happen. */
2680 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2684 debug_printf("hosts_max_try limit reached with this host\n");
2685 for (h = host; h != NULL; h = h->next)
2686 if (h->mx != host->mx) break;
2690 unexpired_hosts_tried--;
2691 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2692 "and will be tried\n");
2696 /* Attempt the delivery. */
2698 total_hosts_tried++;
2699 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2700 expanded_hosts != NULL, &message_defer, FALSE);
2703 OK => connection made, each address contains its result;
2704 message_defer is set for message-specific defers (when all
2705 recipients are marked defer)
2706 DEFER => there was a non-message-specific delivery problem;
2707 ERROR => there was a problem setting up the arguments for a filter,
2708 or there was a problem with expanding added headers
2711 /* If the result is not OK, there was a non-message-specific problem.
2712 If the result is DEFER, we need to write to the logs saying what happened
2713 for this particular host, except in the case of authentication and TLS
2714 failures, where the log has already been written. If all hosts defer a
2715 general message is written at the end. */
2717 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2718 first_addr->basic_errno != ERRNO_TLSFAILURE)
2719 write_logs(first_addr, host);
2721 /* If STARTTLS was accepted, but there was a failure in setting up the
2722 TLS session (usually a certificate screwup), and the host is not in
2723 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2724 TLS forcibly turned off. We have to start from scratch with a new SMTP
2725 connection. That's why the retry is done from here, not from within
2726 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2727 session, so the in-clear transmission after those errors, if permitted,
2728 happens inside smtp_deliver().] */
2731 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2732 ob->tls_tempfail_tryclear &&
2733 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2734 host->address, NULL) != OK)
2736 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2737 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2738 first_addr = prepare_addresses(addrlist, host);
2739 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2740 expanded_hosts != NULL, &message_defer, TRUE);
2741 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2742 write_logs(first_addr, host);
2747 /* Delivery attempt finished */
2749 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2752 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2753 message_id, host->name, host->address, addrlist->address,
2754 (addrlist->next == NULL)? "" : " (& others)", rs);
2756 /* Release serialization if set up */
2758 if (serialized) enq_end(serialize_key);
2760 /* If the result is DEFER, or if a host retry record is known to exist, we
2761 need to add an item to the retry chain for updating the retry database
2762 at the end of delivery. We only need to add the item to the top address,
2763 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2764 for any other delivery attempts using the same address. (It is copied into
2765 the unusable tree at the outer level, so even if different address blocks
2766 contain the same address, it still won't get tried again.) */
2768 if (rc == DEFER || retry_host_key != NULL)
2770 int delete_flag = (rc != DEFER)? rf_delete : 0;
2771 if (retry_host_key == NULL)
2773 retry_host_key = ob->retry_include_ip_address?
2774 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2775 string_sprintf("T:%S%s", host->name, pistring);
2778 /* If a delivery of another message over an existing SMTP connection
2779 yields DEFER, we do NOT set up retry data for the host. This covers the
2780 case when there are delays in routing the addresses in the second message
2781 that are so long that the server times out. This is alleviated by not
2782 routing addresses that previously had routing defers when handling an
2783 existing connection, but even so, this case may occur (e.g. if a
2784 previously happily routed address starts giving routing defers). If the
2785 host is genuinely down, another non-continued message delivery will
2786 notice it soon enough. */
2788 if (delete_flag != 0 || !continuing)
2789 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2791 /* We may have tried an expired host, if its retry time has come; ensure
2792 the status reflects the expiry for the benefit of any other addresses. */
2796 host->status = (host_is_expired)?
2797 hstatus_unusable_expired : hstatus_unusable;
2798 host->why = hwhy_deferred;
2802 /* If message_defer is set (host was OK, but every recipient got deferred
2803 because of some message-specific problem), or if that had happened
2804 previously so that a message retry key exists, add an appropriate item
2805 to the retry chain. Note that if there was a message defer but now there is
2806 a host defer, the message defer record gets deleted. That seems perfectly
2807 reasonable. Also, stop the message from being remembered as waiting
2808 for specific hosts. */
2810 if (message_defer || retry_message_key != NULL)
2812 int delete_flag = message_defer? 0 : rf_delete;
2813 if (retry_message_key == NULL)
2815 retry_message_key = ob->retry_include_ip_address?
2816 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2818 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2820 retry_add_item(addrlist, retry_message_key,
2821 rf_message | rf_host | delete_flag);
2822 update_waiting = FALSE;
2825 /* Any return other than DEFER (that is, OK or ERROR) means that the
2826 addresses have got their final statuses filled in for this host. In the OK
2827 case, see if any of them are deferred. */
2831 for (addr = addrlist; addr != NULL; addr = addr->next)
2833 if (addr->transport_return == DEFER)
2835 some_deferred = TRUE;
2841 /* If no addresses deferred or the result was ERROR, return. We do this for
2842 ERROR because a failing filter set-up or add_headers expansion is likely to
2843 fail for any host we try. */
2845 if (rc == ERROR || (rc == OK && !some_deferred))
2847 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2848 return TRUE; /* Each address has its status */
2851 /* If the result was DEFER or some individual addresses deferred, let
2852 the loop run to try other hosts with the deferred addresses, except for the
2853 case when we were trying to deliver down an existing channel and failed.
2854 Don't try any other hosts in this case. */
2856 if (continuing) break;
2858 /* If the whole delivery, or some individual addresses, were deferred and
2859 there are more hosts that could be tried, do not count this host towards
2860 the hosts_max_try limit if the age of the message is greater than the
2861 maximum retry time for this host. This means we may try try all hosts,
2862 ignoring the limit, when messages have been around for some time. This is
2863 important because if we don't try all hosts, the address will never time
2864 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2866 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2869 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2871 if (retry != NULL && retry->rules != NULL)
2873 retry_rule *last_rule;
2874 for (last_rule = retry->rules;
2875 last_rule->next != NULL;
2876 last_rule = last_rule->next);
2877 timedout = time(NULL) - received_time > last_rule->timeout;
2879 else timedout = TRUE; /* No rule => timed out */
2883 unexpired_hosts_tried--;
2884 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2885 "hosts_max_try (message older than host's retry time)\n");
2888 } /* End of loop for trying multiple hosts. */
2890 /* This is the end of the loop that repeats iff expired is TRUE and
2891 ob->delay_after_cutoff is FALSE. The second time round we will
2892 try those hosts that haven't been tried since the message arrived. */
2896 debug_printf("all IP addresses skipped or deferred at least one address\n");
2897 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
2898 debug_printf("retrying IP addresses not tried since message arrived\n");
2903 /* Get here if all IP addresses are skipped or defer at least one address. In
2904 MUA wrapper mode, this will happen only for connection or other non-message-
2905 specific failures. Force the delivery status for all addresses to FAIL. */
2909 for (addr = addrlist; addr != NULL; addr = addr->next)
2910 addr->transport_return = FAIL;
2914 /* In the normal, non-wrapper case, add a standard message to each deferred
2915 address if there hasn't been an error, that is, if it hasn't actually been
2916 tried this time. The variable "expired" will be FALSE if any deliveries were
2917 actually tried, or if there was at least one host that was not expired. That
2918 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
2919 a delivery has been tried, an error code will be set, and the failing of the
2920 message is handled by the retry code later.
2922 If queue_smtp is set, or this transport was called to send a subsequent message
2923 down an existing TCP/IP connection, and something caused the host not to be
2924 found, we end up here, but can detect these cases and handle them specially. */
2926 for (addr = addrlist; addr != NULL; addr = addr->next)
2928 /* If host is not NULL, it means that we stopped processing the host list
2929 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
2930 means we need to behave as if some hosts were skipped because their retry
2931 time had not come. Specifically, this prevents the address from timing out.
2932 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
2933 hosts were tried. */
2937 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
2940 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
2941 "hosts were tried\n");
2946 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
2947 setflag(addr, af_retry_skipped);
2951 if (queue_smtp) /* no deliveries attempted */
2953 addr->transport_return = DEFER;
2954 addr->basic_errno = 0;
2955 addr->message = US"SMTP delivery explicitly queued";
2958 else if (addr->transport_return == DEFER &&
2959 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
2960 addr->message == NULL)
2962 addr->basic_errno = ERRNO_HRETRY;
2963 if (continue_hostname != NULL)
2965 addr->message = US"no host found for existing SMTP connection";
2969 setflag(addr, af_pass_message); /* This is not a security risk */
2970 addr->message = (ob->delay_after_cutoff)?
2971 US"retry time not reached for any host after a long failure period" :
2972 US"all hosts have been failing for a long time and were last tried "
2973 "after this message arrived";
2975 /* If we are already using fallback hosts, or there are no fallback hosts
2976 defined, convert the result to FAIL to cause a bounce. */
2978 if (addr->host_list == addr->fallback_hosts ||
2979 addr->fallback_hosts == NULL)
2980 addr->transport_return = FAIL;
2984 if (hosts_retry == hosts_total)
2985 addr->message = US"retry time not reached for any host";
2986 else if (hosts_fail == hosts_total)
2987 addr->message = US"all host address lookups failed permanently";
2988 else if (hosts_defer == hosts_total)
2989 addr->message = US"all host address lookups failed temporarily";
2990 else if (hosts_serial == hosts_total)
2991 addr->message = US"connection limit reached for all hosts";
2992 else if (hosts_fail+hosts_defer == hosts_total)
2993 addr->message = US"all host address lookups failed";
2994 else addr->message = US"some host address lookups failed and retry time "
2995 "not reached for other hosts or connection limit reached";
3000 /* Update the database which keeps information about which messages are waiting
3001 for which hosts to become available. For some message-specific errors, the
3002 update_waiting flag is turned off because we don't want follow-on deliveries in
3005 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3009 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3011 return TRUE; /* Each address has its status */
3014 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob