1 /* $Cambridge: exim/src/src/transports/smtp.c,v 1.44 2009/11/16 19:56:54 nm4 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
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) },
43 { "dkim_canon", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
45 { "dkim_domain", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
47 { "dkim_private_key", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
49 { "dkim_selector", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
51 { "dkim_sign_headers", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
53 { "dkim_strict", opt_stringptr,
54 (void *)offsetof(smtp_transport_options_block, dkim_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 */
199 ,NULL, /* dkim_canon */
200 NULL, /* dkim_domain */
201 NULL, /* dkim_private_key */
202 NULL, /* dkim_selector */
203 NULL, /* dkim_sign_headers */
204 NULL /* dkim_strict */
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
792 input. TLS is never active on a passed channel; the previous process always
793 closes it down before passing the connection on.
795 Otherwise, we have to make a connection to the remote host, and do the
796 initial protocol exchange.
798 When running as an MUA wrapper, if the sender or any recipient is rejected,
799 temporarily or permanently, we force failure for all recipients.
802 addrlist chain of potential addresses to deliver; only those whose
803 transport_return field is set to PENDING_DEFER are currently
804 being processed; others should be skipped - they have either
805 been delivered to an earlier host or IP address, or been
806 failed by one of them.
807 host host to deliver to
808 host_af AF_INET or AF_INET6
809 port default TCP/IP port to use, in host byte order
810 interface interface to bind to, or NULL
811 tblock transport instance block
812 copy_host TRUE if host set in addr->host_used must be copied, because
813 it is specific to this call of the transport
814 message_defer set TRUE if yield is OK, but all addresses were deferred
815 because of a non-recipient, non-host failure, that is, a
816 4xx response to MAIL FROM, DATA, or ".". This is a defer
817 that is specific to the message.
818 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
819 a second attempt after TLS initialization fails
821 Returns: OK - the connection was made and the delivery attempted;
822 the result for each address is in its data block.
823 DEFER - the connection could not be made, or something failed
824 while setting up the SMTP session, or there was a
825 non-message-specific error, such as a timeout.
826 ERROR - a filter command is specified for this transport,
827 and there was a problem setting it up; OR helo_data
828 or add_headers or authenticated_sender is specified
829 for this transport, and the string failed to expand
833 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
834 uschar *interface, transport_instance *tblock, BOOL copy_host,
835 BOOL *message_defer, BOOL suppress_tls)
838 address_item *sync_addr;
839 address_item *first_addr = addrlist;
844 time_t start_delivery_time = time(NULL);
845 smtp_transport_options_block *ob =
846 (smtp_transport_options_block *)(tblock->options_block);
847 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
849 BOOL send_rset = TRUE;
850 BOOL send_quit = TRUE;
851 BOOL setting_up = TRUE;
852 BOOL completed_address = FALSE;
855 BOOL pass_message = FALSE;
856 smtp_inblock inblock;
857 smtp_outblock outblock;
858 int max_rcpt = tblock->max_addresses;
859 uschar *igquotstr = US"";
860 uschar *local_authenticated_sender = authenticated_sender;
861 uschar *helo_data = NULL;
862 uschar *message = NULL;
863 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
866 uschar inbuffer[4096];
867 uschar outbuffer[1024];
869 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
871 *message_defer = FALSE;
872 smtp_command = US"initial connection";
873 if (max_rcpt == 0) max_rcpt = 999999;
875 /* Set up the buffer for reading SMTP response packets. */
877 inblock.buffer = inbuffer;
878 inblock.buffersize = sizeof(inbuffer);
879 inblock.ptr = inbuffer;
880 inblock.ptrend = inbuffer;
882 /* Set up the buffer for holding SMTP commands while pipelining */
884 outblock.buffer = outbuffer;
885 outblock.buffersize = sizeof(outbuffer);
886 outblock.ptr = outbuffer;
887 outblock.cmd_count = 0;
888 outblock.authenticating = FALSE;
890 /* Reset the parameters of a TLS session. */
895 /* If an authenticated_sender override has been specified for this transport
896 instance, expand it. If the expansion is forced to fail, and there was already
897 an authenticated_sender for this message, the original value will be used.
898 Other expansion failures are serious. An empty result is ignored, but there is
899 otherwise no check - this feature is expected to be used with LMTP and other
900 cases where non-standard addresses (e.g. without domains) might be required. */
902 if (ob->authenticated_sender != NULL)
904 uschar *new = expand_string(ob->authenticated_sender);
907 if (!expand_string_forcedfail)
909 uschar *message = string_sprintf("failed to expand "
910 "authenticated_sender: %s", expand_string_message);
911 set_errno(addrlist, 0, message, DEFER, FALSE);
915 else if (new[0] != 0) local_authenticated_sender = new;
918 /* Make a connection to the host if this isn't a continued delivery, and handle
919 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
920 specially so they can be identified for retries. */
922 if (continue_hostname == NULL)
924 inblock.sock = outblock.sock =
925 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
926 ob->keepalive); /* This puts port into host->port */
928 if (inblock.sock < 0)
930 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
935 /* Expand the greeting message while waiting for the initial response. (Makes
936 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
937 delayed till here so that $sending_interface and $sending_port are set. */
939 helo_data = expand_string(ob->helo_data);
941 /* The first thing is to wait for an initial OK response. The dreaded "goto"
942 is nevertheless a reasonably clean way of programming this kind of logic,
943 where you want to escape on any error. */
945 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
946 ob->command_timeout)) goto RESPONSE_FAILED;
948 /* Now check if the helo_data expansion went well, and sign off cleanly if it
951 if (helo_data == NULL)
953 uschar *message = string_sprintf("failed to expand helo_data: %s",
954 expand_string_message);
955 set_errno(addrlist, 0, message, DEFER, FALSE);
960 /** Debugging without sending a message
961 addrlist->transport_return = DEFER;
965 /* Errors that occur after this point follow an SMTP command, which is
966 left in big_buffer by smtp_write_command() for use in error messages. */
968 smtp_command = big_buffer;
970 /* Tell the remote who we are...
972 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
973 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
974 greeting is of this form. The assumption was that the far end supports it
975 properly... but experience shows that there are some that give 5xx responses,
976 even though the banner includes "ESMTP" (there's a bloody-minded one that
977 says "ESMTP not spoken here"). Cope with that case.
979 September 2000: Time has passed, and it seems reasonable now to always send
980 EHLO at the start. It is also convenient to make the change while installing
983 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
984 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
985 would be no way to send out the mails, so there is now a host list
986 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
987 PIPELINING problem as well. Maybe it can also be useful to cure other
988 problems with broken servers.
990 Exim originally sent "Helo" at this point and ran for nearly a year that way.
991 Then somebody tried it with a Microsoft mailer... It seems that all other
992 mailers use upper case for some reason (the RFC is quite clear about case
993 independence) so, for peace of mind, I gave in. */
995 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
996 host->name, host->address, NULL) != OK;
1000 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1001 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1003 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1004 ob->command_timeout))
1006 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1013 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1018 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1020 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1021 ob->command_timeout)) goto RESPONSE_FAILED;
1024 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1025 lmtp_ignore_quota option was set. */
1027 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1028 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1029 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1031 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1034 tls_offered = esmtp &&
1035 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1036 PCRE_EOPT, NULL, 0) >= 0;
1040 /* For continuing deliveries down the same channel, the socket is the standard
1041 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1042 below). Set up the pointer to where subsequent commands will be left, for
1043 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1044 set from the command line if they were set in the process that passed the
1049 inblock.sock = outblock.sock = fileno(stdin);
1050 smtp_command = big_buffer;
1051 host->port = port; /* Record the port that was used */
1054 /* If TLS is available on this connection, whether continued or not, attempt to
1055 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1056 send another EHLO - the server may give a different answer in secure mode. We
1057 use a separate buffer for reading the response to STARTTLS so that if it is
1058 negative, the original EHLO data is available for subsequent analysis, should
1059 the client not be required to use TLS. If the response is bad, copy the buffer
1060 for error analysis. */
1063 if (tls_offered && !suppress_tls &&
1064 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1065 host->address, NULL) != OK)
1067 uschar buffer2[4096];
1068 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1071 /* If there is an I/O error, transmission of this message is deferred. If
1072 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1073 false, we also defer. However, if there is a temporary rejection of STARTTLS
1074 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1075 STARTTLS, we carry on. This means we will try to send the message in clear,
1076 unless the host is in hosts_require_tls (tested below). */
1078 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1079 ob->command_timeout))
1081 if (errno != 0 || buffer2[0] == 0 ||
1082 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1084 Ustrncpy(buffer, buffer2, sizeof(buffer));
1085 goto RESPONSE_FAILED;
1089 /* STARTTLS accepted: try to negotiate a TLS session. */
1093 int rc = tls_client_start(inblock.sock,
1096 NULL, /* No DH param */
1097 ob->tls_certificate,
1099 ob->tls_verify_certificates,
1101 ob->tls_require_ciphers,
1102 ob->gnutls_require_mac,
1103 ob->gnutls_require_kx,
1104 ob->gnutls_require_proto,
1105 ob->command_timeout);
1107 /* TLS negotiation failed; give an error. From outside, this function may
1108 be called again to try in clear on a new connection, if the options permit
1109 it for this host. */
1113 save_errno = ERRNO_TLSFAILURE;
1114 message = US"failure while setting up TLS session";
1119 /* TLS session is set up */
1121 for (addr = addrlist; addr != NULL; addr = addr->next)
1123 if (addr->transport_return == PENDING_DEFER)
1125 addr->cipher = tls_cipher;
1126 addr->peerdn = tls_peerdn;
1132 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1133 helo_data is null, we are dealing with a connection that was passed from
1134 another process, and so we won't have expanded helo_data above. We have to
1135 expand it here. $sending_ip_address and $sending_port are set up right at the
1136 start of the Exim process (in exim.c). */
1138 if (tls_active >= 0)
1140 if (helo_data == NULL)
1142 helo_data = expand_string(ob->helo_data);
1143 if (helo_data == NULL)
1145 uschar *message = string_sprintf("failed to expand helo_data: %s",
1146 expand_string_message);
1147 set_errno(addrlist, 0, message, DEFER, FALSE);
1153 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO",
1156 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1157 ob->command_timeout))
1158 goto RESPONSE_FAILED;
1161 /* If the host is required to use a secure channel, ensure that we
1164 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1165 host->address, NULL) == OK)
1167 save_errno = ERRNO_TLSREQUIRED;
1168 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1169 host->name, host->address,
1170 tls_offered? "an attempt to start TLS failed" :
1171 "the server did not offer TLS support");
1176 /* If TLS is active, we have just started it up and re-done the EHLO command,
1177 so its response needs to be analyzed. If TLS is not active and this is a
1178 continued session down a previously-used socket, we haven't just done EHLO, so
1181 if (continue_hostname == NULL
1188 uschar *fail_reason = US"server did not advertise AUTH support";
1190 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1191 lmtp_ignore_quota option was set. */
1193 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1194 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1195 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1197 /* If the response to EHLO specified support for the SIZE parameter, note
1198 this, provided size_addition is non-negative. */
1200 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1201 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1202 PCRE_EOPT, NULL, 0) >= 0;
1204 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1205 the current host, esmtp will be false, so PIPELINING can never be used. If
1206 the current host matches hosts_avoid_pipelining, don't do it. */
1208 smtp_use_pipelining = esmtp &&
1209 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1210 host->address, NULL) != OK &&
1211 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1212 PCRE_EOPT, NULL, 0) >= 0;
1214 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1215 smtp_use_pipelining? "" : "not ");
1217 /* Note if the response to EHLO specifies support for the AUTH extension.
1218 If it has, check that this host is one we want to authenticate to, and do
1219 the business. The host name and address must be available when the
1220 authenticator's client driver is running. */
1222 smtp_authenticated = FALSE;
1223 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1224 host->name, host->address, NULL);
1226 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1228 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1229 expand_nmax = -1; /* reset */
1231 /* Must not do this check until after we have saved the result of the
1232 regex match above. */
1234 if (require_auth == OK ||
1235 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1236 host->address, NULL) == OK)
1239 fail_reason = US"no common mechanisms were found";
1241 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1243 /* Scan the configured authenticators looking for one which is configured
1244 for use as a client, which is not suppressed by client_condition, and
1245 whose name matches an authentication mechanism supported by the server.
1246 If one is found, attempt to authenticate by calling its client function.
1249 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1253 (au->client_condition != NULL &&
1254 !expand_check_condition(au->client_condition, au->name,
1255 US"client authenticator")))
1257 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1259 (au->client)? "client_condition is false" :
1260 "not configured as a client");
1264 /* Loop to scan supported server mechanisms */
1269 int len = Ustrlen(au->public_name);
1270 while (isspace(*p)) p++;
1272 if (strncmpic(au->public_name, p, len) != 0 ||
1273 (p[len] != 0 && !isspace(p[len])))
1275 while (*p != 0 && !isspace(*p)) p++;
1279 /* Found data for a listed mechanism. Call its client entry. Set
1280 a flag in the outblock so that data is overwritten after sending so
1281 that reflections don't show it. */
1283 fail_reason = US"authentication attempt(s) failed";
1284 outblock.authenticating = TRUE;
1285 rc = (au->info->clientcode)(au, &inblock, &outblock,
1286 ob->command_timeout, buffer, sizeof(buffer));
1287 outblock.authenticating = FALSE;
1288 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1291 /* A temporary authentication failure must hold up delivery to
1292 this host. After a permanent authentication failure, we carry on
1293 to try other authentication methods. If all fail hard, try to
1294 deliver the message unauthenticated unless require_auth was set. */
1299 smtp_authenticated = TRUE; /* stops the outer loop */
1302 /* Failure after writing a command */
1307 /* Failure after reading a response */
1310 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1311 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1312 au->name, host->name, host->address, buffer);
1315 /* Failure by some other means. In effect, the authenticator
1316 decided it wasn't prepared to handle this case. Typically this
1317 is the result of "fail" in an expansion string. Do we need to
1318 log anything here? Feb 2006: a message is now put in the buffer
1319 if logging is required. */
1323 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1324 "authentication H=%s [%s] %s", au->name, host->name,
1325 host->address, buffer);
1328 /* Internal problem, message in buffer. */
1332 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1336 break; /* If not authenticated, try next authenticator */
1337 } /* Loop for scanning supported server mechanisms */
1338 } /* Loop for further authenticators */
1342 /* If we haven't authenticated, but are required to, give up. */
1344 if (require_auth == OK && !smtp_authenticated)
1347 set_errno(addrlist, ERRNO_AUTHFAIL,
1348 string_sprintf("authentication required but %s", fail_reason), DEFER,
1354 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1355 message-specific. */
1359 /* If there is a filter command specified for this transport, we can now
1360 set it up. This cannot be done until the identify of the host is known. */
1362 if (tblock->filter_command != NULL)
1366 sprintf(CS buffer, "%.50s transport", tblock->name);
1367 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1368 TRUE, DEFER, addrlist, buffer, NULL);
1369 transport_filter_timeout = tblock->filter_timeout;
1371 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1376 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1384 /* For messages that have more than the maximum number of envelope recipients,
1385 we want to send several transactions down the same SMTP connection. (See
1386 comments in deliver.c as to how this reconciles, heuristically, with
1387 remote_max_parallel.) This optimization was added to Exim after the following
1388 code was already working. The simplest way to put it in without disturbing the
1389 code was to use a goto to jump back to this point when there is another
1390 transaction to handle. */
1393 sync_addr = first_addr;
1397 completed_address = FALSE;
1400 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1401 qualification, send it, adding something to the message size to allow for
1402 imprecision and things that get added en route. Exim keeps the number of lines
1403 in a message, so we can give an accurate value for the original message, but we
1404 need some additional to handle added headers. (Double "." characters don't get
1405 included in the count.) */
1412 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1416 /* Add the authenticated sender address if present */
1418 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1419 local_authenticated_sender != NULL)
1421 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1422 auth_xtextencode(local_authenticated_sender,
1423 Ustrlen(local_authenticated_sender)));
1426 /* From here until we send the DATA command, we can make use of PIPELINING
1427 if the server host supports it. The code has to be able to check the responses
1428 at any point, for when the buffer fills up, so we write it totally generally.
1429 When PIPELINING is off, each command written reports that it has flushed the
1432 pending_MAIL = TRUE; /* The block starts with MAIL */
1434 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1435 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1436 mail_command = string_copy(big_buffer); /* Save for later error message */
1440 case -1: /* Transmission error */
1443 case +1: /* Block was sent */
1444 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1445 ob->command_timeout))
1447 if (errno == 0 && buffer[0] == '4')
1449 errno = ERRNO_MAIL4XX;
1450 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1452 goto RESPONSE_FAILED;
1454 pending_MAIL = FALSE;
1458 /* Pass over all the relevant recipient addresses for this host, which are the
1459 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1460 several before we have to read the responses for those seen so far. This
1461 checking is done by a subroutine because it also needs to be done at the end.
1462 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1463 the next one if not all are sent.
1465 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1466 last address because we want to abort if any recipients have any kind of
1467 problem, temporary or permanent. We know that all recipient addresses will have
1468 the PENDING_DEFER status, because only one attempt is ever made, and we know
1469 that max_rcpt will be large, so all addresses will be done at once. */
1471 for (addr = first_addr;
1472 address_count < max_rcpt && addr != NULL;
1478 if (addr->transport_return != PENDING_DEFER) continue;
1481 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1483 /* Now send the RCPT command, and process outstanding responses when
1484 necessary. After a timeout on RCPT, we just end the function, leaving the
1485 yield as OK, because this error can often mean that there is a problem with
1486 just one address, so we don't want to delay the host. */
1488 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1489 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1490 if (count < 0) goto SEND_FAILED;
1493 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1494 &sync_addr, host, count, ob->address_retry_include_sender,
1495 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1498 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1499 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1502 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1503 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1504 case 0: /* No 2xx or 5xx, but no probs */
1507 case -1: goto END_OFF; /* Timeout on RCPT */
1508 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1510 pending_MAIL = FALSE; /* Dealt with MAIL */
1512 } /* Loop for next address */
1514 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1515 permanently or temporarily. We should have flushed and synced after the last
1520 address_item *badaddr;
1521 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1523 if (badaddr->transport_return != PENDING_OK) break;
1525 if (badaddr != NULL)
1527 set_errno(addrlist, 0, badaddr->message, FAIL,
1528 testflag(badaddr, af_pass_message));
1533 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1534 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1535 have a good recipient buffered up if we are pipelining. We don't want to waste
1536 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1537 are pipelining. The responses are all handled by sync_responses(). */
1539 if (ok || (smtp_use_pipelining && !mua_wrapper))
1541 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1542 if (count < 0) goto SEND_FAILED;
1543 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1544 host, count, ob->address_retry_include_sender, pending_MAIL,
1545 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1547 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1548 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1551 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1552 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1553 case 0: break; /* No 2xx or 5xx, but no probs */
1555 case -1: goto END_OFF; /* Timeout on RCPT */
1556 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1560 /* Save the first address of the next batch. */
1564 /* If there were no good recipients (but otherwise there have been no
1565 problems), just set ok TRUE, since we have handled address-specific errors
1566 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1567 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1568 well as body. Set the appropriate timeout value to be used for each chunk.
1569 (Haven't been able to make it work using select() for writing yet.) */
1571 if (!ok) ok = TRUE; else
1573 sigalrm_seen = FALSE;
1574 transport_write_timeout = ob->data_timeout;
1575 smtp_command = US"sending data block"; /* For error messages */
1576 DEBUG(D_transport|D_v)
1577 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1578 transport_count = 0;
1579 #ifndef DISABLE_DKIM
1580 ok = dkim_transport_write_message(addrlist, inblock.sock,
1581 topt_use_crlf | topt_end_dot | topt_escape_headers |
1582 (tblock->body_only? topt_no_headers : 0) |
1583 (tblock->headers_only? topt_no_body : 0) |
1584 (tblock->return_path_add? topt_add_return_path : 0) |
1585 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1586 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1587 0, /* No size limit */
1588 tblock->add_headers, tblock->remove_headers,
1589 US".", US"..", /* Escaping strings */
1590 tblock->rewrite_rules, tblock->rewrite_existflags,
1591 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1592 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1595 ok = transport_write_message(addrlist, inblock.sock,
1596 topt_use_crlf | topt_end_dot | topt_escape_headers |
1597 (tblock->body_only? topt_no_headers : 0) |
1598 (tblock->headers_only? topt_no_body : 0) |
1599 (tblock->return_path_add? topt_add_return_path : 0) |
1600 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1601 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1602 0, /* No size limit */
1603 tblock->add_headers, tblock->remove_headers,
1604 US".", US"..", /* Escaping strings */
1605 tblock->rewrite_rules, tblock->rewrite_existflags);
1608 /* transport_write_message() uses write() because it is called from other
1609 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1610 it can exit with "Broken pipe" as its error. This really means that the
1611 socket got closed at the far end. */
1613 transport_write_timeout = 0; /* for subsequent transports */
1615 /* Failure can either be some kind of I/O disaster (including timeout),
1616 or the failure of a transport filter or the expansion of added headers. */
1620 buffer[0] = 0; /* There hasn't been a response */
1621 goto RESPONSE_FAILED;
1624 /* We used to send the terminating "." explicitly here, but because of
1625 buffering effects at both ends of TCP/IP connections, you don't gain
1626 anything by keeping it separate, so it might as well go in the final
1627 data buffer for efficiency. This is now done by setting the topt_end_dot
1630 smtp_command = US"end of data";
1632 /* For SMTP, we now read a single response that applies to the whole message.
1633 If it is OK, then all the addresses have been delivered. */
1637 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1639 if (!ok && errno == 0 && buffer[0] == '4')
1641 errno = ERRNO_DATA4XX;
1642 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1646 /* For LMTP, we get back a response for every RCPT command that we sent;
1647 some may be accepted and some rejected. For those that get a response, their
1648 status is fixed; any that are accepted have been handed over, even if later
1649 responses crash - at least, that's how I read RFC 2033.
1651 If all went well, mark the recipient addresses as completed, record which
1652 host/IPaddress they were delivered to, and cut out RSET when sending another
1653 message down the same channel. Write the completed addresses to the journal
1654 now so that they are recorded in case there is a crash of hardware or
1655 software before the spool gets updated. Also record the final SMTP
1656 confirmation if needed (for SMTP only). */
1661 int delivery_time = (int)(time(NULL) - start_delivery_time);
1664 uschar *conf = NULL;
1667 /* Make a copy of the host if it is local to this invocation
1668 of the transport. */
1672 thost = store_get(sizeof(host_item));
1674 thost->name = string_copy(host->name);
1675 thost->address = string_copy(host->address);
1679 /* Set up confirmation if needed - applies only to SMTP */
1681 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1683 uschar *s = string_printing(buffer);
1684 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1687 /* Process all transported addresses - for LMTP, read a status for
1690 for (addr = addrlist; addr != first_addr; addr = addr->next)
1692 if (addr->transport_return != PENDING_OK) continue;
1694 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1695 remaining addresses. Otherwise, it's a return code for just the one
1696 address. For temporary errors, add a retry item for the address so that
1697 it doesn't get tried again too soon. */
1701 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1704 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1705 addr->message = string_sprintf("LMTP error after %s: %s",
1706 big_buffer, string_printing(buffer));
1707 setflag(addr, af_pass_message); /* Allow message to go to user */
1708 if (buffer[0] == '5')
1709 addr->transport_return = FAIL;
1712 errno = ERRNO_DATA4XX;
1713 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1714 addr->transport_return = DEFER;
1715 retry_add_item(addr, addr->address_retry_key, 0);
1719 completed_address = TRUE; /* NOW we can set this flag */
1720 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1722 uschar *s = string_printing(buffer);
1723 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1727 /* SMTP, or success return from LMTP for this address. Pass back the
1728 actual host that was used. */
1730 addr->transport_return = OK;
1731 addr->more_errno = delivery_time;
1732 addr->host_used = thost;
1733 addr->special_action = flag;
1734 addr->message = conf;
1737 /* Update the journal. For homonymic addresses, use the base address plus
1738 the transport name. See lots of comments in deliver.c about the reasons
1739 for the complications when homonyms are involved. Just carry on after
1740 write error, as it may prove possible to update the spool file later. */
1742 if (testflag(addr, af_homonym))
1743 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1745 sprintf(CS buffer, "%.500s\n", addr->unique);
1747 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1748 len = Ustrlen(CS buffer);
1749 if (write(journal_fd, buffer, len) != len)
1750 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1751 "%s: %s", buffer, strerror(errno));
1754 /* Ensure the journal file is pushed out to disk. */
1756 if (EXIMfsync(journal_fd) < 0)
1757 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1763 /* Handle general (not specific to one address) failures here. The value of ok
1764 is used to skip over this code on the falling through case. A timeout causes a
1765 deferral. Other errors may defer or fail according to the response code, and
1766 may set up a special errno value, e.g. after connection chopped, which is
1767 assumed if errno == 0 and there is no text in the buffer. If control reaches
1768 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1769 the problem is not related to this specific message. */
1778 send_quit = check_response(host, &save_errno, addrlist->more_errno,
1779 buffer, &code, &message, &pass_message);
1785 message = US string_sprintf("send() to %s [%s] failed: %s",
1786 host->name, host->address, strerror(save_errno));
1790 /* This label is jumped to directly when a TLS negotiation has failed,
1791 or was not done for a host for which it is required. Values will be set
1792 in message and save_errno, and setting_up will always be true. Treat as
1793 a temporary error. */
1800 /* If the failure happened while setting up the call, see if the failure was
1801 a 5xx response (this will either be on connection, or following HELO - a 5xx
1802 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
1803 never going to accept them. For other errors during setting up (timeouts or
1804 whatever), defer all addresses, and yield DEFER, so that the host is not
1805 tried again for a while. */
1808 ok = FALSE; /* For when reached by GOTO */
1814 set_errno(addrlist, save_errno, message, FAIL, pass_message);
1818 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1823 /* We want to handle timeouts after MAIL or "." and loss of connection after
1824 "." specially. They can indicate a problem with the sender address or with
1825 the contents of the message rather than a real error on the connection. These
1826 cases are treated in the same way as a 4xx response. This next bit of code
1827 does the classification. */
1838 message_error = TRUE;
1842 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
1843 Ustrncmp(smtp_command,"end ",4) == 0;
1846 case ERRNO_SMTPCLOSED:
1847 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
1851 message_error = FALSE;
1855 /* Handle the cases that are treated as message errors. These are:
1857 (a) negative response or timeout after MAIL
1858 (b) negative response after DATA
1859 (c) negative response or timeout or dropped connection after "."
1861 It won't be a negative response or timeout after RCPT, as that is dealt
1862 with separately above. The action in all cases is to set an appropriate
1863 error code for all the addresses, but to leave yield set to OK because the
1864 host itself has not failed. Of course, it might in practice have failed
1865 when we've had a timeout, but if so, we'll discover that at the next
1866 delivery attempt. For a temporary error, set the message_defer flag, and
1867 write to the logs for information if this is not the last host. The error
1868 for the last host will be logged as part of the address's log line. */
1872 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
1873 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
1876 /* If there's an errno, the message contains just the identity of
1879 if (code != '5') /* Anything other than 5 is treated as temporary */
1882 message = US string_sprintf("%s: %s", message, strerror(save_errno));
1883 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
1884 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
1885 *message_defer = TRUE;
1889 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
1890 ".", or some other transportation error. We defer all addresses and yield
1891 DEFER, except for the case of failed add_headers expansion, or a transport
1892 filter failure, when the yield should be ERROR, to stop it trying other
1897 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
1898 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
1899 set_errno(addrlist, save_errno, message, DEFER, pass_message);
1905 /* If all has gone well, send_quit will be set TRUE, implying we can end the
1906 SMTP session tidily. However, if there were too many addresses to send in one
1907 message (indicated by first_addr being non-NULL) we want to carry on with the
1908 rest of them. Also, it is desirable to send more than one message down the SMTP
1909 connection if there are several waiting, provided we haven't already sent so
1910 many as to hit the configured limit. The function transport_check_waiting looks
1911 for a waiting message and returns its id. Then transport_pass_socket tries to
1912 set up a continued delivery by passing the socket on to another process. The
1913 variable send_rset is FALSE if a message has just been successfully transfered.
1915 If we are already sending down a continued channel, there may be further
1916 addresses not yet delivered that are aimed at the same host, but which have not
1917 been passed in this run of the transport. In this case, continue_more will be
1918 true, and all we should do is send RSET if necessary, and return, leaving the
1921 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
1922 do not want to continue with other messages down the same channel, because that
1923 can lead to looping between two or more messages, all with the same,
1924 temporarily failing address(es). [The retry information isn't updated yet, so
1925 new processes keep on trying.] We probably also don't want to try more of this
1926 message's addresses either.
1928 If we have started a TLS session, we have to end it before passing the
1929 connection to a new process. However, not all servers can handle this (Exim
1930 can), so we do not pass such a connection on if the host matches
1931 hosts_nopass_tls. */
1934 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
1935 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
1936 continue_more, yield, (first_addr == NULL)? "":"not ");
1938 if (completed_address && ok && send_quit)
1941 if (first_addr != NULL || continue_more ||
1944 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
1945 host->address, NULL) != OK)
1947 transport_check_waiting(tblock->name, host->name,
1948 tblock->connection_max_messages, new_message_id, &more)
1956 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
1958 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
1959 host->address, strerror(save_errno));
1962 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1963 ob->command_timeout)))
1966 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
1970 DEBUG(D_transport) debug_printf("%s\n", msg);
1975 /* Either RSET was not needed, or it succeeded */
1979 if (first_addr != NULL) /* More addresses still to be sent */
1980 { /* in this run of the transport */
1981 continue_sequence++; /* Causes * in logging */
1984 if (continue_more) return yield; /* More addresses for another run */
1986 /* Pass the socket to a new Exim process. Before doing so, we must shut
1987 down TLS. Not all MTAs allow for the continuation of the SMTP session
1988 when TLS is shut down. We test for this by sending a new EHLO. If we
1989 don't get a good response, we don't attempt to pass the socket on. */
1992 if (tls_active >= 0)
1995 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
1996 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1997 ob->command_timeout);
2001 /* If the socket is successfully passed, we musn't send QUIT (or
2002 indeed anything!) from here. */
2004 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2005 new_message_id, inblock.sock))
2011 /* If RSET failed and there are addresses left, they get deferred. */
2013 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2017 /* End off tidily with QUIT unless the connection has died or the socket has
2018 been passed to another process. There has been discussion on the net about what
2019 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2020 to wait for a response, but on the other hand, there isn't anything one can do
2021 with an error response, other than log it. Exim used to do that. However,
2022 further discussion suggested that it is positively advantageous not to wait for
2023 the response, but to close the session immediately. This is supposed to move
2024 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2025 load from the server. (Hosts that are both servers and clients may not see much
2026 difference, of course.) Further discussion indicated that this was safe to do
2027 on Unix systems which have decent implementations of TCP/IP that leave the
2028 connection around for a while (TIME_WAIT) after the application has gone away.
2029 This enables the response sent by the server to be properly ACKed rather than
2030 timed out, as can happen on broken TCP/IP implementations on other OS.
2032 This change is being made on 31-Jul-98. After over a year of trouble-free
2033 operation, the old commented-out code was removed on 17-Sep-99. */
2036 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2044 /* Close the socket, and return the appropriate value, first setting
2045 continue_transport and continue_hostname NULL to prevent any other addresses
2046 that may include the host from trying to re-use a continuation socket. This
2047 works because the NULL setting is passed back to the calling process, and
2048 remote_max_parallel is forced to 1 when delivering over an existing connection,
2050 If all went well and continue_more is set, we shouldn't actually get here if
2051 there are further addresses, as the return above will be taken. However,
2052 writing RSET might have failed, or there may be other addresses whose hosts are
2053 specified in the transports, and therefore not visible at top level, in which
2054 case continue_more won't get set. */
2056 (void)close(inblock.sock);
2057 continue_transport = NULL;
2058 continue_hostname = NULL;
2065 /*************************************************
2066 * Closedown entry point *
2067 *************************************************/
2069 /* This function is called when exim is passed an open smtp channel
2070 from another incarnation, but the message which it has been asked
2071 to deliver no longer exists. The channel is on stdin.
2073 We might do fancy things like looking for another message to send down
2074 the channel, but if the one we sought has gone, it has probably been
2075 delivered by some other process that itself will seek further messages,
2076 so just close down our connection.
2078 Argument: pointer to the transport instance block
2083 smtp_transport_closedown(transport_instance *tblock)
2085 smtp_transport_options_block *ob =
2086 (smtp_transport_options_block *)(tblock->options_block);
2087 smtp_inblock inblock;
2088 smtp_outblock outblock;
2090 uschar inbuffer[4096];
2091 uschar outbuffer[16];
2093 inblock.sock = fileno(stdin);
2094 inblock.buffer = inbuffer;
2095 inblock.buffersize = sizeof(inbuffer);
2096 inblock.ptr = inbuffer;
2097 inblock.ptrend = inbuffer;
2099 outblock.sock = inblock.sock;
2100 outblock.buffersize = sizeof(outbuffer);
2101 outblock.buffer = outbuffer;
2102 outblock.ptr = outbuffer;
2103 outblock.cmd_count = 0;
2104 outblock.authenticating = FALSE;
2106 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2107 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2108 ob->command_timeout);
2109 (void)close(inblock.sock);
2114 /*************************************************
2115 * Prepare addresses for delivery *
2116 *************************************************/
2118 /* This function is called to flush out error settings from previous delivery
2119 attempts to other hosts. It also records whether we got here via an MX record
2120 or not in the more_errno field of the address. We are interested only in
2121 addresses that are still marked DEFER - others may have got delivered to a
2122 previously considered IP address. Set their status to PENDING_DEFER to indicate
2123 which ones are relevant this time.
2126 addrlist the list of addresses
2127 host the host we are delivering to
2129 Returns: the first address for this delivery
2132 static address_item *
2133 prepare_addresses(address_item *addrlist, host_item *host)
2135 address_item *first_addr = NULL;
2137 for (addr = addrlist; addr != NULL; addr = addr->next)
2139 if (addr->transport_return != DEFER) continue;
2140 if (first_addr == NULL) first_addr = addr;
2141 addr->transport_return = PENDING_DEFER;
2142 addr->basic_errno = 0;
2143 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2144 addr->message = NULL;
2146 addr->cipher = NULL;
2147 addr->peerdn = NULL;
2155 /*************************************************
2156 * Main entry point *
2157 *************************************************/
2159 /* See local README for interface details. As this is a remote transport, it is
2160 given a chain of addresses to be delivered in one connection, if possible. It
2161 always returns TRUE, indicating that each address has its own independent
2162 status set, except if there is a setting up problem, in which case it returns
2166 smtp_transport_entry(
2167 transport_instance *tblock, /* data for this instantiation */
2168 address_item *addrlist) /* addresses we are working on */
2172 int hosts_defer = 0;
2174 int hosts_looked_up = 0;
2175 int hosts_retry = 0;
2176 int hosts_serial = 0;
2177 int hosts_total = 0;
2178 int total_hosts_tried = 0;
2180 BOOL expired = TRUE;
2181 BOOL continuing = continue_hostname != NULL;
2182 uschar *expanded_hosts = NULL;
2184 uschar *tid = string_sprintf("%s transport", tblock->name);
2185 smtp_transport_options_block *ob =
2186 (smtp_transport_options_block *)(tblock->options_block);
2187 host_item *hostlist = addrlist->host_list;
2188 host_item *host = NULL;
2192 debug_printf("%s transport entered\n", tblock->name);
2193 for (addr = addrlist; addr != NULL; addr = addr->next)
2194 debug_printf(" %s\n", addr->address);
2195 if (continuing) debug_printf("already connected to %s [%s]\n",
2196 continue_hostname, continue_host_address);
2199 /* Set the flag requesting that these hosts be added to the waiting
2200 database if the delivery fails temporarily or if we are running with
2201 queue_smtp or a 2-stage queue run. This gets unset for certain
2202 kinds of error, typically those that are specific to the message. */
2204 update_waiting = TRUE;
2206 /* If a host list is not defined for the addresses - they must all have the
2207 same one in order to be passed to a single transport - or if the transport has
2208 a host list with hosts_override set, use the host list supplied with the
2209 transport. It is an error for this not to exist. */
2211 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2213 if (ob->hosts == NULL)
2215 addrlist->message = string_sprintf("%s transport called with no hosts set",
2217 addrlist->transport_return = PANIC;
2218 return FALSE; /* Only top address has status */
2221 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2224 /* If the transport's host list contains no '$' characters, and we are not
2225 randomizing, it is fixed and therefore a chain of hosts can be built once
2226 and for all, and remembered for subsequent use by other calls to this
2227 transport. If, on the other hand, the host list does contain '$', or we are
2228 randomizing its order, we have to rebuild it each time. In the fixed case,
2229 as the hosts string will never be used again, it doesn't matter that we
2230 replace all the : characters with zeros. */
2232 if (ob->hostlist == NULL)
2234 uschar *s = ob->hosts;
2236 if (Ustrchr(s, '$') != NULL)
2238 expanded_hosts = expand_string(s);
2239 if (expanded_hosts == NULL)
2241 addrlist->message = string_sprintf("failed to expand list of hosts "
2242 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2243 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2244 return FALSE; /* Only top address has status */
2246 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2247 "\"%s\"\n", s, expanded_hosts);
2251 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2253 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2255 /* Check that the expansion yielded something useful. */
2256 if (hostlist == NULL)
2259 string_sprintf("%s transport has empty hosts setting", tblock->name);
2260 addrlist->transport_return = PANIC;
2261 return FALSE; /* Only top address has status */
2264 /* If there was no expansion of hosts, save the host list for
2267 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2270 /* This is not the first time this transport has been run in this delivery;
2271 the host list was built previously. */
2273 else hostlist = ob->hostlist;
2276 /* The host list was supplied with the address. If hosts_randomize is set, we
2277 must sort it into a random order if it did not come from MX records and has not
2278 already been randomized (but don't bother if continuing down an existing
2281 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2283 host_item *newlist = NULL;
2284 while (hostlist != NULL)
2286 host_item *h = hostlist;
2287 hostlist = hostlist->next;
2289 h->sort_key = random_number(100);
2291 if (newlist == NULL)
2296 else if (h->sort_key < newlist->sort_key)
2303 host_item *hh = newlist;
2304 while (hh->next != NULL)
2306 if (h->sort_key < hh->next->sort_key) break;
2314 hostlist = addrlist->host_list = newlist;
2318 /* Sort out the default port. */
2320 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2323 /* For each host-plus-IP-address on the list:
2325 . If this is a continued delivery and the host isn't the one with the
2326 current connection, skip.
2328 . If the status is unusable (i.e. previously failed or retry checked), skip.
2330 . If no IP address set, get the address, either by turning the name into
2331 an address, calling gethostbyname if gethostbyname is on, or by calling
2332 the DNS. The DNS may yield multiple addresses, in which case insert the
2333 extra ones into the list.
2335 . Get the retry data if not previously obtained for this address and set the
2336 field which remembers the state of this address. Skip if the retry time is
2337 not reached. If not, remember whether retry data was found. The retry string
2338 contains both the name and the IP address.
2340 . Scan the list of addresses and mark those whose status is DEFER as
2341 PENDING_DEFER. These are the only ones that will be processed in this cycle
2344 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2345 Some addresses may be successfully delivered, others may fail, and yet
2346 others may get temporary errors and so get marked DEFER.
2348 . The return from the delivery attempt is OK if a connection was made and a
2349 valid SMTP dialogue was completed. Otherwise it is DEFER.
2351 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2353 . If fail to connect, or other defer state, add a retry item.
2355 . If there are any addresses whose status is still DEFER, carry on to the
2356 next host/IPaddress, unless we have tried the number of hosts given
2357 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2358 there is some fancy logic for hosts_max_try that means its limit can be
2359 overstepped in some circumstances.
2361 If we get to the end of the list, all hosts have deferred at least one address,
2362 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2363 delivery attempt to those hosts whose last try was before the arrival time of
2364 the current message. To cope with this, we have to go round the loop a second
2365 time. After that, set the status and error data for any addresses that haven't
2366 had it set already. */
2368 for (cutoff_retry = 0; expired &&
2369 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2372 host_item *nexthost = NULL;
2373 int unexpired_hosts_tried = 0;
2375 for (host = hostlist;
2377 unexpired_hosts_tried < ob->hosts_max_try &&
2378 total_hosts_tried < ob->hosts_max_try_hardlimit;
2384 BOOL serialized = FALSE;
2385 BOOL host_is_expired = FALSE;
2386 BOOL message_defer = FALSE;
2387 BOOL ifchanges = FALSE;
2388 BOOL some_deferred = FALSE;
2389 address_item *first_addr = NULL;
2390 uschar *interface = NULL;
2391 uschar *retry_host_key = NULL;
2392 uschar *retry_message_key = NULL;
2393 uschar *serialize_key = NULL;
2395 /* Default next host is next host. :-) But this can vary if the
2396 hosts_max_try limit is hit (see below). It may also be reset if a host
2397 address is looked up here (in case the host was multihomed). */
2399 nexthost = host->next;
2401 /* If the address hasn't yet been obtained from the host name, look it up
2402 now, unless the host is already marked as unusable. If it is marked as
2403 unusable, it means that the router was unable to find its IP address (in
2404 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2405 the lookup failed last time. We don't get this far if *all* MX records
2406 point to non-existent hosts; that is treated as a hard error.
2408 We can just skip this host entirely. When the hosts came from the router,
2409 the address will timeout based on the other host(s); when the address is
2410 looked up below, there is an explicit retry record added.
2412 Note that we mustn't skip unusable hosts if the address is not unset; they
2413 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2415 if (host->address == NULL)
2417 int new_port, flags;
2419 uschar *canonical_name;
2421 if (host->status >= hstatus_unusable)
2423 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2428 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2430 /* The host name is permitted to have an attached port. Find it, and
2431 strip it from the name. Just remember it for now. */
2433 new_port = host_item_get_port(host);
2435 /* Count hosts looked up */
2439 /* Find by name if so configured, or if it's an IP address. We don't
2440 just copy the IP address, because we need the test-for-local to happen. */
2442 flags = HOST_FIND_BY_A;
2443 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2444 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2446 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2447 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2449 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2450 &canonical_name, NULL);
2452 /* Update the host (and any additional blocks, resulting from
2453 multihoming) with a host-specific port, if any. */
2455 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2457 /* Failure to find the host at this time (usually DNS temporary failure)
2458 is really a kind of routing failure rather than a transport failure.
2459 Therefore we add a retry item of the routing kind, not to stop us trying
2460 to look this name up here again, but to ensure the address gets timed
2461 out if the failures go on long enough. A complete failure at this point
2462 commonly points to a configuration error, but the best action is still
2463 to carry on for the next host. */
2465 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2467 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2469 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2470 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2471 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2472 host->status = hstatus_unusable;
2474 for (addr = addrlist; addr != NULL; addr = addr->next)
2476 if (addr->transport_return != DEFER) continue;
2477 addr->basic_errno = ERRNO_UNKNOWNHOST;
2479 string_sprintf("failed to lookup IP address for %s", host->name);
2484 /* If the host is actually the local host, we may have a problem, or
2485 there may be some cunning configuration going on. In the problem case,
2486 log things and give up. The default transport status is already DEFER. */
2488 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2490 for (addr = addrlist; addr != NULL; addr = addr->next)
2492 addr->basic_errno = 0;
2493 addr->message = string_sprintf("%s transport found host %s to be "
2494 "local", tblock->name, host->name);
2498 } /* End of block for IP address lookup */
2500 /* If this is a continued delivery, we are interested only in the host
2501 which matches the name of the existing open channel. The check is put
2502 here after the local host lookup, in case the name gets expanded as a
2503 result of the lookup. Set expired FALSE, to save the outer loop executing
2506 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2507 Ustrcmp(continue_host_address, host->address) != 0))
2510 continue; /* With next host */
2513 /* Reset the default next host in case a multihomed host whose addresses
2514 are not looked up till just above added to the host list. */
2516 nexthost = host->next;
2518 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2519 domain is in queue_smtp_domains, we don't actually want to attempt any
2520 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2521 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2522 were not in it. We don't want to hold up all SMTP deliveries! Except when
2523 doing a two-stage queue run, don't do this if forcing. */
2525 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2526 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2527 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2530 for (addr = addrlist; addr != NULL; addr = addr->next)
2532 if (addr->transport_return != DEFER) continue;
2533 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2535 continue; /* With next host */
2538 /* Count hosts being considered - purely for an intelligent comment
2539 if none are usable. */
2543 /* Set $host and $host address now in case they are needed for the
2544 interface expansion or the serialize_hosts check; they remain set if an
2545 actual delivery happens. */
2547 deliver_host = host->name;
2548 deliver_host_address = host->address;
2550 /* Set up a string for adding to the retry key if the port number is not
2551 the standard SMTP port. A host may have its own port setting that overrides
2554 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2556 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2558 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2559 string changes upon expansion, we must add it to the key that is used for
2560 retries, because connections to the same host from a different interface
2561 should be treated separately. */
2563 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2564 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2567 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2569 /* The first time round the outer loop, check the status of the host by
2570 inspecting the retry data. The second time round, we are interested only
2571 in expired hosts that haven't been tried since this message arrived. */
2573 if (cutoff_retry == 0)
2575 /* Ensure the status of the address is set by checking retry data if
2576 necessary. There maybe host-specific retry data (applicable to all
2577 messages) and also data for retries of a specific message at this host.
2578 If either of these retry records are actually read, the keys used are
2579 returned to save recomputing them later. */
2581 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2582 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2584 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2585 (host->address == NULL)? US"" : host->address, pistring,
2586 (host->status == hstatus_usable)? "usable" :
2587 (host->status == hstatus_unusable)? "unusable" :
2588 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2590 /* Skip this address if not usable at this time, noting if it wasn't
2591 actually expired, both locally and in the address. */
2593 switch (host->status)
2595 case hstatus_unusable:
2597 setflag(addrlist, af_retry_skipped);
2600 case hstatus_unusable_expired:
2603 case hwhy_retry: hosts_retry++; break;
2604 case hwhy_failed: hosts_fail++; break;
2605 case hwhy_deferred: hosts_defer++; break;
2608 /* If there was a retry message key, implying that previously there
2609 was a message-specific defer, we don't want to update the list of
2610 messages waiting for these hosts. */
2612 if (retry_message_key != NULL) update_waiting = FALSE;
2613 continue; /* With the next host or IP address */
2617 /* Second time round the loop: if the address is set but expired, and
2618 the message is newer than the last try, let it through. */
2622 if (host->address == NULL ||
2623 host->status != hstatus_unusable_expired ||
2624 host->last_try > received_time)
2627 debug_printf("trying expired host %s [%s]%s\n",
2628 host->name, host->address, pistring);
2629 host_is_expired = TRUE;
2632 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2633 it remains TRUE only if all hosts are expired and none are actually tried.
2638 /* If this host is listed as one to which access must be serialized,
2639 see if another Exim process has a connection to it, and if so, skip
2640 this host. If not, update the database to record our connection to it
2641 and remember this for later deletion. Do not do any of this if we are
2642 sending the message down a pre-existing connection. */
2645 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2646 host->address, NULL) == OK)
2648 serialize_key = string_sprintf("host-serialize-%s", host->name);
2649 if (!enq_start(serialize_key))
2652 debug_printf("skipping host %s because another Exim process "
2653 "is connected to it\n", host->name);
2660 /* OK, we have an IP address that is not waiting for its retry time to
2661 arrive (it might be expired) OR (second time round the loop) we have an
2662 expired host that hasn't been tried since the message arrived. Have a go
2663 at delivering the message to it. First prepare the addresses by flushing
2664 out the result of previous attempts, and finding the first address that
2665 is still to be delivered. */
2667 first_addr = prepare_addresses(addrlist, host);
2669 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2670 message_id, host->name, host->address, addrlist->address,
2671 (addrlist->next == NULL)? "" : ", ...");
2673 set_process_info("delivering %s to %s [%s] (%s%s)",
2674 message_id, host->name, host->address, addrlist->address,
2675 (addrlist->next == NULL)? "" : ", ...");
2677 /* This is not for real; don't do the delivery. If there are
2678 any remaining hosts, list them. */
2683 set_errno(addrlist, 0, NULL, OK, FALSE);
2684 for (addr = addrlist; addr != NULL; addr = addr->next)
2686 addr->host_used = host;
2687 addr->special_action = '*';
2688 addr->message = US"delivery bypassed by -N option";
2692 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2693 "*** host and remaining hosts:\n", tblock->name);
2694 for (host2 = host; host2 != NULL; host2 = host2->next)
2695 debug_printf(" %s [%s]\n", host2->name,
2696 (host2->address == NULL)? US"unset" : host2->address);
2701 /* This is for real. If the host is expired, we don't count it for
2702 hosts_max_retry. This ensures that all hosts must expire before an address
2703 is timed out, unless hosts_max_try_hardlimit (which protects against
2704 lunatic DNS configurations) is reached.
2706 If the host is not expired and we are about to hit the hosts_max_retry
2707 limit, check to see if there is a subsequent hosts with a different MX
2708 value. If so, make that the next host, and don't count this one. This is a
2709 heuristic to make sure that different MXs do get tried. With a normal kind
2710 of retry rule, they would get tried anyway when the earlier hosts were
2711 delayed, but if the domain has a "retry every time" type of rule - as is
2712 often used for the the very large ISPs, that won't happen. */
2716 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2720 debug_printf("hosts_max_try limit reached with this host\n");
2721 for (h = host; h != NULL; h = h->next)
2722 if (h->mx != host->mx) break;
2726 unexpired_hosts_tried--;
2727 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2728 "and will be tried\n");
2732 /* Attempt the delivery. */
2734 total_hosts_tried++;
2735 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2736 expanded_hosts != NULL, &message_defer, FALSE);
2739 OK => connection made, each address contains its result;
2740 message_defer is set for message-specific defers (when all
2741 recipients are marked defer)
2742 DEFER => there was a non-message-specific delivery problem;
2743 ERROR => there was a problem setting up the arguments for a filter,
2744 or there was a problem with expanding added headers
2747 /* If the result is not OK, there was a non-message-specific problem.
2748 If the result is DEFER, we need to write to the logs saying what happened
2749 for this particular host, except in the case of authentication and TLS
2750 failures, where the log has already been written. If all hosts defer a
2751 general message is written at the end. */
2753 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2754 first_addr->basic_errno != ERRNO_TLSFAILURE)
2755 write_logs(first_addr, host);
2757 /* If STARTTLS was accepted, but there was a failure in setting up the
2758 TLS session (usually a certificate screwup), and the host is not in
2759 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2760 TLS forcibly turned off. We have to start from scratch with a new SMTP
2761 connection. That's why the retry is done from here, not from within
2762 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2763 session, so the in-clear transmission after those errors, if permitted,
2764 happens inside smtp_deliver().] */
2767 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2768 ob->tls_tempfail_tryclear &&
2769 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2770 host->address, NULL) != OK)
2772 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
2773 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
2774 first_addr = prepare_addresses(addrlist, host);
2775 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2776 expanded_hosts != NULL, &message_defer, TRUE);
2777 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
2778 write_logs(first_addr, host);
2783 /* Delivery attempt finished */
2785 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
2788 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
2789 message_id, host->name, host->address, addrlist->address,
2790 (addrlist->next == NULL)? "" : " (& others)", rs);
2792 /* Release serialization if set up */
2794 if (serialized) enq_end(serialize_key);
2796 /* If the result is DEFER, or if a host retry record is known to exist, we
2797 need to add an item to the retry chain for updating the retry database
2798 at the end of delivery. We only need to add the item to the top address,
2799 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
2800 for any other delivery attempts using the same address. (It is copied into
2801 the unusable tree at the outer level, so even if different address blocks
2802 contain the same address, it still won't get tried again.) */
2804 if (rc == DEFER || retry_host_key != NULL)
2806 int delete_flag = (rc != DEFER)? rf_delete : 0;
2807 if (retry_host_key == NULL)
2809 retry_host_key = ob->retry_include_ip_address?
2810 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
2811 string_sprintf("T:%S%s", host->name, pistring);
2814 /* If a delivery of another message over an existing SMTP connection
2815 yields DEFER, we do NOT set up retry data for the host. This covers the
2816 case when there are delays in routing the addresses in the second message
2817 that are so long that the server times out. This is alleviated by not
2818 routing addresses that previously had routing defers when handling an
2819 existing connection, but even so, this case may occur (e.g. if a
2820 previously happily routed address starts giving routing defers). If the
2821 host is genuinely down, another non-continued message delivery will
2822 notice it soon enough. */
2824 if (delete_flag != 0 || !continuing)
2825 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
2827 /* We may have tried an expired host, if its retry time has come; ensure
2828 the status reflects the expiry for the benefit of any other addresses. */
2832 host->status = (host_is_expired)?
2833 hstatus_unusable_expired : hstatus_unusable;
2834 host->why = hwhy_deferred;
2838 /* If message_defer is set (host was OK, but every recipient got deferred
2839 because of some message-specific problem), or if that had happened
2840 previously so that a message retry key exists, add an appropriate item
2841 to the retry chain. Note that if there was a message defer but now there is
2842 a host defer, the message defer record gets deleted. That seems perfectly
2843 reasonable. Also, stop the message from being remembered as waiting
2844 for specific hosts. */
2846 if (message_defer || retry_message_key != NULL)
2848 int delete_flag = message_defer? 0 : rf_delete;
2849 if (retry_message_key == NULL)
2851 retry_message_key = ob->retry_include_ip_address?
2852 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
2854 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
2856 retry_add_item(addrlist, retry_message_key,
2857 rf_message | rf_host | delete_flag);
2858 update_waiting = FALSE;
2861 /* Any return other than DEFER (that is, OK or ERROR) means that the
2862 addresses have got their final statuses filled in for this host. In the OK
2863 case, see if any of them are deferred. */
2867 for (addr = addrlist; addr != NULL; addr = addr->next)
2869 if (addr->transport_return == DEFER)
2871 some_deferred = TRUE;
2877 /* If no addresses deferred or the result was ERROR, return. We do this for
2878 ERROR because a failing filter set-up or add_headers expansion is likely to
2879 fail for any host we try. */
2881 if (rc == ERROR || (rc == OK && !some_deferred))
2883 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
2884 return TRUE; /* Each address has its status */
2887 /* If the result was DEFER or some individual addresses deferred, let
2888 the loop run to try other hosts with the deferred addresses, except for the
2889 case when we were trying to deliver down an existing channel and failed.
2890 Don't try any other hosts in this case. */
2892 if (continuing) break;
2894 /* If the whole delivery, or some individual addresses, were deferred and
2895 there are more hosts that could be tried, do not count this host towards
2896 the hosts_max_try limit if the age of the message is greater than the
2897 maximum retry time for this host. This means we may try try all hosts,
2898 ignoring the limit, when messages have been around for some time. This is
2899 important because if we don't try all hosts, the address will never time
2900 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
2902 if ((rc == DEFER || some_deferred) && nexthost != NULL)
2905 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
2907 if (retry != NULL && retry->rules != NULL)
2909 retry_rule *last_rule;
2910 for (last_rule = retry->rules;
2911 last_rule->next != NULL;
2912 last_rule = last_rule->next);
2913 timedout = time(NULL) - received_time > last_rule->timeout;
2915 else timedout = TRUE; /* No rule => timed out */
2919 unexpired_hosts_tried--;
2920 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
2921 "hosts_max_try (message older than host's retry time)\n");
2924 } /* End of loop for trying multiple hosts. */
2926 /* This is the end of the loop that repeats iff expired is TRUE and
2927 ob->delay_after_cutoff is FALSE. The second time round we will
2928 try those hosts that haven't been tried since the message arrived. */
2932 debug_printf("all IP addresses skipped or deferred at least one address\n");
2933 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
2934 debug_printf("retrying IP addresses not tried since message arrived\n");
2939 /* Get here if all IP addresses are skipped or defer at least one address. In
2940 MUA wrapper mode, this will happen only for connection or other non-message-
2941 specific failures. Force the delivery status for all addresses to FAIL. */
2945 for (addr = addrlist; addr != NULL; addr = addr->next)
2946 addr->transport_return = FAIL;
2950 /* In the normal, non-wrapper case, add a standard message to each deferred
2951 address if there hasn't been an error, that is, if it hasn't actually been
2952 tried this time. The variable "expired" will be FALSE if any deliveries were
2953 actually tried, or if there was at least one host that was not expired. That
2954 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
2955 a delivery has been tried, an error code will be set, and the failing of the
2956 message is handled by the retry code later.
2958 If queue_smtp is set, or this transport was called to send a subsequent message
2959 down an existing TCP/IP connection, and something caused the host not to be
2960 found, we end up here, but can detect these cases and handle them specially. */
2962 for (addr = addrlist; addr != NULL; addr = addr->next)
2964 /* If host is not NULL, it means that we stopped processing the host list
2965 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
2966 means we need to behave as if some hosts were skipped because their retry
2967 time had not come. Specifically, this prevents the address from timing out.
2968 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
2969 hosts were tried. */
2973 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
2976 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
2977 "hosts were tried\n");
2982 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
2983 setflag(addr, af_retry_skipped);
2987 if (queue_smtp) /* no deliveries attempted */
2989 addr->transport_return = DEFER;
2990 addr->basic_errno = 0;
2991 addr->message = US"SMTP delivery explicitly queued";
2994 else if (addr->transport_return == DEFER &&
2995 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
2996 addr->message == NULL)
2998 addr->basic_errno = ERRNO_HRETRY;
2999 if (continue_hostname != NULL)
3001 addr->message = US"no host found for existing SMTP connection";
3005 setflag(addr, af_pass_message); /* This is not a security risk */
3006 addr->message = (ob->delay_after_cutoff)?
3007 US"retry time not reached for any host after a long failure period" :
3008 US"all hosts have been failing for a long time and were last tried "
3009 "after this message arrived";
3011 /* If we are already using fallback hosts, or there are no fallback hosts
3012 defined, convert the result to FAIL to cause a bounce. */
3014 if (addr->host_list == addr->fallback_hosts ||
3015 addr->fallback_hosts == NULL)
3016 addr->transport_return = FAIL;
3020 if (hosts_retry == hosts_total)
3021 addr->message = US"retry time not reached for any host";
3022 else if (hosts_fail == hosts_total)
3023 addr->message = US"all host address lookups failed permanently";
3024 else if (hosts_defer == hosts_total)
3025 addr->message = US"all host address lookups failed temporarily";
3026 else if (hosts_serial == hosts_total)
3027 addr->message = US"connection limit reached for all hosts";
3028 else if (hosts_fail+hosts_defer == hosts_total)
3029 addr->message = US"all host address lookups failed";
3030 else addr->message = US"some host address lookups failed and retry time "
3031 "not reached for other hosts or connection limit reached";
3036 /* Update the database which keeps information about which messages are waiting
3037 for which hosts to become available. For some message-specific errors, the
3038 update_waiting flag is turned off because we don't want follow-on deliveries in
3041 if (update_waiting) transport_update_waiting(hostlist, tblock->name);
3045 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3047 return TRUE; /* Each address has its status */
3050 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob