1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
58 { "dnssec_request_domains", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
60 { "dnssec_require_domains", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
72 ignore; a later release will warn, and a later-still release will remove
73 these options, so that using them becomes an error. */
74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_OCSP)
106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
112 # if defined EXPERIMENTAL_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 #ifdef EXPERIMENTAL_PRDR
122 { "hosts_try_prdr", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 { "hosts_verify_avoid_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
129 { "interface", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, interface) },
131 { "keepalive", opt_bool,
132 (void *)offsetof(smtp_transport_options_block, keepalive) },
133 { "lmtp_ignore_quota", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
135 { "max_rcpt", opt_int | opt_public,
136 (void *)offsetof(transport_instance, max_addresses) },
137 { "multi_domain", opt_bool | opt_public,
138 (void *)offsetof(transport_instance, multi_domain) },
139 { "port", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, port) },
141 { "protocol", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, protocol) },
143 { "retry_include_ip_address", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
145 { "serialize_hosts", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
147 { "size_addition", opt_int,
148 (void *)offsetof(smtp_transport_options_block, size_addition) }
150 ,{ "tls_certificate", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
152 { "tls_crl", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_crl) },
154 { "tls_dh_min_bits", opt_int,
155 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
156 { "tls_privatekey", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
158 { "tls_require_ciphers", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
160 { "tls_sni", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_sni) },
162 { "tls_tempfail_tryclear", opt_bool,
163 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
164 { "tls_try_verify_hosts", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
166 { "tls_verify_certificates", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
168 { "tls_verify_hosts", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
171 #ifdef EXPERIMENTAL_TPDA
172 ,{ "tpda_host_defer_action", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
177 /* Size of the options list. An extern variable has to be used so that its
178 address can appear in the tables drtables.c. */
180 int smtp_transport_options_count =
181 sizeof(smtp_transport_options)/sizeof(optionlist);
183 /* Default private options block for the smtp transport. */
185 smtp_transport_options_block smtp_transport_option_defaults = {
187 NULL, /* fallback_hosts */
189 NULL, /* fallback_hostlist */
190 NULL, /* authenticated_sender */
191 US"$primary_hostname", /* helo_data */
192 NULL, /* interface */
194 US"smtp", /* protocol */
196 NULL, /* serialize_hosts */
197 NULL, /* hosts_try_auth */
198 NULL, /* hosts_require_auth */
199 #ifdef EXPERIMENTAL_PRDR
200 NULL, /* hosts_try_prdr */
202 #ifdef EXPERIMENTAL_OCSP
203 US"*", /* hosts_request_ocsp */
204 NULL, /* hosts_require_ocsp */
206 NULL, /* hosts_require_tls */
207 NULL, /* hosts_avoid_tls */
208 US"*", /* hosts_verify_avoid_tls */
209 NULL, /* hosts_avoid_pipelining */
210 NULL, /* hosts_avoid_esmtp */
211 NULL, /* hosts_nopass_tls */
212 5*60, /* command_timeout */
213 5*60, /* connect_timeout; shorter system default overrides */
214 5*60, /* data timeout */
215 10*60, /* final timeout */
216 1024, /* size_addition */
217 5, /* hosts_max_try */
218 50, /* hosts_max_try_hardlimit */
219 TRUE, /* address_retry_include_sender */
220 FALSE, /* allow_localhost */
221 FALSE, /* authenticated_sender_force */
222 FALSE, /* gethostbyname */
223 TRUE, /* dns_qualify_single */
224 FALSE, /* dns_search_parents */
225 NULL, /* dnssec_request_domains */
226 NULL, /* dnssec_require_domains */
227 TRUE, /* delay_after_cutoff */
228 FALSE, /* hosts_override */
229 FALSE, /* hosts_randomize */
230 TRUE, /* keepalive */
231 FALSE, /* lmtp_ignore_quota */
232 TRUE /* retry_include_ip_address */
234 ,NULL, /* tls_certificate */
236 NULL, /* tls_privatekey */
237 NULL, /* tls_require_ciphers */
238 NULL, /* gnutls_require_kx */
239 NULL, /* gnutls_require_mac */
240 NULL, /* gnutls_require_proto */
242 NULL, /* tls_verify_certificates */
243 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
244 /* tls_dh_min_bits */
245 TRUE, /* tls_tempfail_tryclear */
246 NULL, /* tls_verify_hosts */
247 NULL /* tls_try_verify_hosts */
250 ,NULL, /* dkim_canon */
251 NULL, /* dkim_domain */
252 NULL, /* dkim_private_key */
253 NULL, /* dkim_selector */
254 NULL, /* dkim_sign_headers */
255 NULL /* dkim_strict */
257 #ifdef EXPERIMENTAL_TPDA
258 ,NULL /* tpda_host_defer_action */
265 static uschar *smtp_command; /* Points to last cmd for error messages */
266 static uschar *mail_command; /* Points to MAIL cmd for error messages */
267 static BOOL update_waiting; /* TRUE to update the "wait" database */
270 /*************************************************
271 * Setup entry point *
272 *************************************************/
274 /* This function is called when the transport is about to be used,
275 but before running it in a sub-process. It is used for two things:
277 (1) To set the fallback host list in addresses, when delivering.
278 (2) To pass back the interface, port, protocol, and other options, for use
279 during callout verification.
282 tblock pointer to the transport instance block
283 addrlist list of addresses about to be transported
284 tf if not NULL, pointer to block in which to return options
285 uid the uid that will be set (not used)
286 gid the gid that will be set (not used)
287 errmsg place for error message (not used)
289 Returns: OK always (FAIL, DEFER not used)
293 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
294 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
296 smtp_transport_options_block *ob =
297 (smtp_transport_options_block *)(tblock->options_block);
299 errmsg = errmsg; /* Keep picky compilers happy */
303 /* Pass back options if required. This interface is getting very messy. */
307 tf->interface = ob->interface;
309 tf->protocol = ob->protocol;
310 tf->hosts = ob->hosts;
311 tf->hosts_override = ob->hosts_override;
312 tf->hosts_randomize = ob->hosts_randomize;
313 tf->gethostbyname = ob->gethostbyname;
314 tf->qualify_single = ob->dns_qualify_single;
315 tf->search_parents = ob->dns_search_parents;
316 tf->helo_data = ob->helo_data;
319 /* Set the fallback host list for all the addresses that don't have fallback
320 host lists, provided that the local host wasn't present in the original host
323 if (!testflag(addrlist, af_local_host_removed))
325 for (; addrlist != NULL; addrlist = addrlist->next)
326 if (addrlist->fallback_hosts == NULL)
327 addrlist->fallback_hosts = ob->fallback_hostlist;
335 /*************************************************
336 * Initialization entry point *
337 *************************************************/
339 /* Called for each instance, after its options have been read, to
340 enable consistency checks to be done, or anything else that needs
343 Argument: pointer to the transport instance block
348 smtp_transport_init(transport_instance *tblock)
350 smtp_transport_options_block *ob =
351 (smtp_transport_options_block *)(tblock->options_block);
353 /* Retry_use_local_part defaults FALSE if unset */
355 if (tblock->retry_use_local_part == TRUE_UNSET)
356 tblock->retry_use_local_part = FALSE;
358 /* Set the default port according to the protocol */
360 if (ob->port == NULL)
361 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
362 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
364 /* Set up the setup entry point, to be called before subprocesses for this
367 tblock->setup = smtp_transport_setup;
369 /* Complain if any of the timeouts are zero. */
371 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
372 ob->final_timeout <= 0)
373 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
374 "command, data, or final timeout value is zero for %s transport",
377 /* If hosts_override is set and there are local hosts, set the global
378 flag that stops verify from showing router hosts. */
380 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
382 /* If there are any fallback hosts listed, build a chain of host items
383 for them, but do not do any lookups at this time. */
385 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
392 /*************************************************
393 * Set delivery info into all active addresses *
394 *************************************************/
396 /* Only addresses whose status is >= PENDING are relevant. A lesser
397 status means that an address is not currently being processed.
400 addrlist points to a chain of addresses
401 errno_value to put in each address's errno field
402 msg to put in each address's message field
403 rc to put in each address's transport_return field
404 pass_message if TRUE, set the "pass message" flag in the address
406 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
407 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
408 this particular type of timeout.
414 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
419 if (errno_value == ERRNO_CONNECTTIMEOUT)
421 errno_value = ETIMEDOUT;
422 orvalue = RTEF_CTOUT;
424 for (addr = addrlist; addr != NULL; addr = addr->next)
426 if (addr->transport_return < PENDING) continue;
427 addr->basic_errno = errno_value;
428 addr->more_errno |= orvalue;
432 if (pass_message) setflag(addr, af_pass_message);
434 addr->transport_return = rc;
440 /*************************************************
441 * Check an SMTP response *
442 *************************************************/
444 /* This function is given an errno code and the SMTP response buffer
445 to analyse, together with the host identification for generating messages. It
446 sets an appropriate message and puts the first digit of the response code into
447 the yield variable. If no response was actually read, a suitable digit is
451 host the current host, to get its name for messages
452 errno_value pointer to the errno value
453 more_errno from the top address for use with ERRNO_FILTER_FAIL
454 buffer the SMTP response buffer
455 yield where to put a one-digit SMTP response code
456 message where to put an errror message
457 pass_message set TRUE if message is an SMTP response
459 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
462 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
463 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
467 if (smtp_use_pipelining &&
468 (Ustrcmp(smtp_command, "MAIL") == 0 ||
469 Ustrcmp(smtp_command, "RCPT") == 0 ||
470 Ustrcmp(smtp_command, "DATA") == 0))
473 *yield = '4'; /* Default setting is to give a temporary error */
475 /* Handle response timeout */
477 if (*errno_value == ETIMEDOUT)
479 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
480 "after %s%s", host->name, host->address, pl, smtp_command);
481 if (transport_count > 0)
482 *message = US string_sprintf("%s (%d bytes written)", *message,
487 /* Handle malformed SMTP response */
489 if (*errno_value == ERRNO_SMTPFORMAT)
491 uschar *malfresp = string_printing(buffer);
492 while (isspace(*malfresp)) malfresp++;
494 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
495 "%s [%s] in response to %s%s", host->name, host->address, pl,
498 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
499 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
503 /* Handle a failed filter process error; can't send QUIT as we mustn't
506 if (*errno_value == ERRNO_FILTER_FAIL)
508 *message = US string_sprintf("transport filter process failed (%d)%s",
510 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
514 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
517 if (*errno_value == ERRNO_CHHEADER_FAIL)
520 US string_sprintf("failed to expand headers_add or headers_remove: %s",
521 expand_string_message);
525 /* Handle failure to write a complete data block */
527 if (*errno_value == ERRNO_WRITEINCOMPLETE)
529 *message = US string_sprintf("failed to write a data block");
533 /* Handle error responses from the remote mailer. */
537 uschar *s = string_printing(buffer);
538 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
539 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
540 *pass_message = TRUE;
545 /* No data was read. If there is no errno, this must be the EOF (i.e.
546 connection closed) case, which causes deferral. An explicit connection reset
547 error has the same effect. Otherwise, put the host's identity in the message,
548 leaving the errno value to be interpreted as well. In all cases, we have to
549 assume the connection is now dead. */
551 if (*errno_value == 0 || *errno_value == ECONNRESET)
553 *errno_value = ERRNO_SMTPCLOSED;
554 *message = US string_sprintf("Remote host %s [%s] closed connection "
555 "in response to %s%s", host->name, host->address, pl, smtp_command);
557 else *message = US string_sprintf("%s [%s]", host->name, host->address);
564 /*************************************************
565 * Write error message to logs *
566 *************************************************/
568 /* This writes to the main log and to the message log.
571 addr the address item containing error information
572 host the current host
578 write_logs(address_item *addr, host_item *host)
580 if (addr->message != NULL)
582 uschar *message = addr->message;
583 if (addr->basic_errno > 0)
584 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
585 log_write(0, LOG_MAIN, "%s", message);
586 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
591 ((log_extra_selector & LX_outgoing_port) != 0)?
592 string_sprintf("%s [%s]:%d", host->name, host->address,
593 (host->port == PORT_NONE)? 25 : host->port)
595 string_sprintf("%s [%s]", host->name, host->address);
596 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
597 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
598 strerror(addr->basic_errno));
604 #ifdef EXPERIMENTAL_TPDA
605 /*************************************************
606 * Post-defer action *
607 *************************************************/
609 /* This expands an arbitrary per-transport string.
610 It might, for example, be used to write to the database log.
613 ob transport options block
614 addr the address item containing error information
615 host the current host
621 tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
623 uschar *action = ob->tpda_host_defer_action;
627 tpda_delivery_ip = string_copy(host->address);
628 tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
629 tpda_delivery_fqdn = string_copy(host->name);
630 tpda_delivery_local_part = string_copy(addr->local_part);
631 tpda_delivery_domain = string_copy(addr->domain);
632 tpda_defer_errno = addr->basic_errno;
634 tpda_defer_errstr = addr->message
635 ? addr->basic_errno > 0
636 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
637 : string_copy(addr->message)
638 : addr->basic_errno > 0
639 ? string_copy(strerror(addr->basic_errno))
643 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
644 action, tpda_delivery_ip);
646 router_name = addr->router->name;
647 transport_name = addr->transport->name;
648 if (!expand_string(action) && *expand_string_message)
649 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_defer_action in %s: %s\n",
650 transport_name, expand_string_message);
651 router_name = transport_name = NULL;
657 /*************************************************
658 * Synchronize SMTP responses *
659 *************************************************/
661 /* This function is called from smtp_deliver() to receive SMTP responses from
662 the server, and match them up with the commands to which they relate. When
663 PIPELINING is not in use, this function is called after every command, and is
664 therefore somewhat over-engineered, but it is simpler to use a single scheme
665 that works both with and without PIPELINING instead of having two separate sets
668 The set of commands that are buffered up with pipelining may start with MAIL
669 and may end with DATA; in between are RCPT commands that correspond to the
670 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
671 etc.) are never buffered.
673 Errors after MAIL or DATA abort the whole process leaving the response in the
674 buffer. After MAIL, pending responses are flushed, and the original command is
675 re-instated in big_buffer for error messages. For RCPT commands, the remote is
676 permitted to reject some recipient addresses while accepting others. However
677 certain errors clearly abort the whole process. Set the value in
678 transport_return to PENDING_OK if the address is accepted. If there is a
679 subsequent general error, it will get reset accordingly. If not, it will get
680 converted to OK at the end.
683 addrlist the complete address list
684 include_affixes TRUE if affixes include in RCPT
685 sync_addr ptr to the ptr of the one to start scanning at (updated)
686 host the host we are connected to
687 count the number of responses to read
689 include_sender true if 4xx retry is to include the sender it its key
690 pending_MAIL true if the first response is for MAIL
691 pending_DATA 0 if last command sent was not DATA
692 +1 if previously had a good recipient
693 -1 if not previously had a good recipient
694 inblock incoming SMTP block
695 timeout timeout value
696 buffer buffer for reading response
697 buffsize size of buffer
699 Returns: 3 if at least one address had 2xx and one had 5xx
700 2 if at least one address had 5xx but none had 2xx
701 1 if at least one host had a 2xx response, but none had 5xx
702 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
703 -1 timeout while reading RCPT response
704 -2 I/O or other non-response error for RCPT
705 -3 DATA or MAIL failed - errno and buffer set
709 sync_responses(address_item *addrlist, BOOL include_affixes,
710 address_item **sync_addr, host_item *host, int count,
711 BOOL address_retry_include_sender, BOOL pending_MAIL,
712 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
715 address_item *addr = *sync_addr;
718 /* Handle the response for a MAIL command. On error, reinstate the original
719 command in big_buffer for error message use, and flush any further pending
720 responses before returning, except after I/O errors and timeouts. */
725 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
727 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
728 if (errno == 0 && buffer[0] != 0)
730 uschar flushbuffer[4096];
732 if (buffer[0] == '4')
734 save_errno = ERRNO_MAIL4XX;
735 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
739 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
741 && (errno != 0 || flushbuffer[0] == 0))
750 if (pending_DATA) count--; /* Number of RCPT responses to come */
752 /* Read and handle the required number of RCPT responses, matching each one up
753 with an address by scanning for the next address whose status is PENDING_DEFER.
758 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
760 /* The address was accepted */
762 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
765 addr->transport_return = PENDING_OK;
767 /* If af_dr_retry_exists is set, there was a routing delay on this address;
768 ensure that any address-specific retry record is expunged. We do this both
769 for the basic key and for the version that also includes the sender. */
771 if (testflag(addr, af_dr_retry_exists))
773 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
775 retry_add_item(addr, altkey, rf_delete);
776 retry_add_item(addr, addr->address_retry_key, rf_delete);
780 /* Timeout while reading the response */
782 else if (errno == ETIMEDOUT)
784 int save_errno = errno;
785 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
786 "after RCPT TO:<%s>", host->name, host->address,
787 transport_rcpt_address(addr, include_affixes));
788 set_errno(addrlist, save_errno, message, DEFER, FALSE);
789 retry_add_item(addr, addr->address_retry_key, 0);
790 update_waiting = FALSE;
794 /* Handle other errors in obtaining an SMTP response by returning -1. This
795 will cause all the addresses to be deferred. Restore the SMTP command in
796 big_buffer for which we are checking the response, so the error message
799 else if (errno != 0 || buffer[0] == 0)
801 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
802 transport_rcpt_address(addr, include_affixes));
806 /* Handle SMTP permanent and temporary response codes. */
811 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
812 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
813 host->name, host->address, string_printing(buffer));
814 setflag(addr, af_pass_message);
815 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
817 /* The response was 5xx */
819 if (buffer[0] == '5')
821 addr->transport_return = FAIL;
825 /* The response was 4xx */
829 addr->transport_return = DEFER;
830 addr->basic_errno = ERRNO_RCPT4XX;
831 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
833 /* Log temporary errors if there are more hosts to be tried. */
835 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
837 /* Do not put this message on the list of those waiting for specific
838 hosts, as otherwise it is likely to be tried too often. */
840 update_waiting = FALSE;
842 /* Add a retry item for the address so that it doesn't get tried again
843 too soon. If address_retry_include_sender is true, add the sender address
846 if (address_retry_include_sender)
848 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
850 retry_add_item(addr, altkey, 0);
852 else retry_add_item(addr, addr->address_retry_key, 0);
855 } /* Loop for next RCPT response */
857 /* Update where to start at for the next block of responses, unless we
858 have already handled all the addresses. */
860 if (addr != NULL) *sync_addr = addr->next;
862 /* Handle a response to DATA. If we have not had any good recipients, either
863 previously or in this block, the response is ignored. */
865 if (pending_DATA != 0 &&
866 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
871 if (pending_DATA > 0 || (yield & 1) != 0)
873 if (errno == 0 && buffer[0] == '4')
875 errno = ERRNO_DATA4XX;
876 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
880 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
881 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
882 "is in use and there were no good recipients\n", msg);
885 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
886 present) received 3xx. If any RCPTs were handled and yielded anything other
887 than 4xx, yield will be set non-zero. */
894 /* Do the client side of smtp-level authentication */
897 buffer EHLO response from server (gets overwritten)
898 addrlist chain of potential addresses to deliver
899 host host to deliver to
901 ibp, obp comms channel control blocks
904 OK Success, or failed (but not required): global "smtp_authenticated" set
905 DEFER Failed authentication (and was required)
906 ERROR Internal problem
908 FAIL_SEND Failed communications - transmit
913 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
914 smtp_transport_options_block *ob, BOOL is_esmtp,
915 smtp_inblock *ibp, smtp_outblock *obp)
918 uschar *fail_reason = US"server did not advertise AUTH support";
920 smtp_authenticated = FALSE;
921 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
922 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
923 host->name, host->address, NULL);
925 if (is_esmtp && !regex_AUTH) regex_AUTH =
926 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
929 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
931 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
932 expand_nmax = -1; /* reset */
934 /* Must not do this check until after we have saved the result of the
935 regex match above. */
937 if (require_auth == OK ||
938 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
939 host->address, NULL) == OK)
942 fail_reason = US"no common mechanisms were found";
944 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
946 /* Scan the configured authenticators looking for one which is configured
947 for use as a client, which is not suppressed by client_condition, and
948 whose name matches an authentication mechanism supported by the server.
949 If one is found, attempt to authenticate by calling its client function.
952 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
956 (au->client_condition != NULL &&
957 !expand_check_condition(au->client_condition, au->name,
958 US"client authenticator")))
960 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
962 (au->client)? "client_condition is false" :
963 "not configured as a client");
967 /* Loop to scan supported server mechanisms */
972 int len = Ustrlen(au->public_name);
973 while (isspace(*p)) p++;
975 if (strncmpic(au->public_name, p, len) != 0 ||
976 (p[len] != 0 && !isspace(p[len])))
978 while (*p != 0 && !isspace(*p)) p++;
982 /* Found data for a listed mechanism. Call its client entry. Set
983 a flag in the outblock so that data is overwritten after sending so
984 that reflections don't show it. */
986 fail_reason = US"authentication attempt(s) failed";
987 obp->authenticating = TRUE;
988 rc = (au->info->clientcode)(au, ibp, obp,
989 ob->command_timeout, buffer, bufsize);
990 obp->authenticating = FALSE;
991 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
994 /* A temporary authentication failure must hold up delivery to
995 this host. After a permanent authentication failure, we carry on
996 to try other authentication methods. If all fail hard, try to
997 deliver the message unauthenticated unless require_auth was set. */
1002 smtp_authenticated = TRUE; /* stops the outer loop */
1003 client_authenticator = au->name;
1004 if (au->set_client_id != NULL)
1005 client_authenticated_id = expand_string(au->set_client_id);
1008 /* Failure after writing a command */
1013 /* Failure after reading a response */
1016 if (errno != 0 || buffer[0] != '5') return FAIL;
1017 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1018 au->name, host->name, host->address, buffer);
1021 /* Failure by some other means. In effect, the authenticator
1022 decided it wasn't prepared to handle this case. Typically this
1023 is the result of "fail" in an expansion string. Do we need to
1024 log anything here? Feb 2006: a message is now put in the buffer
1025 if logging is required. */
1029 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1030 "authentication H=%s [%s] %s", au->name, host->name,
1031 host->address, buffer);
1034 /* Internal problem, message in buffer. */
1037 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1041 break; /* If not authenticated, try next authenticator */
1042 } /* Loop for scanning supported server mechanisms */
1043 } /* Loop for further authenticators */
1047 /* If we haven't authenticated, but are required to, give up. */
1049 if (require_auth == OK && !smtp_authenticated)
1051 set_errno(addrlist, ERRNO_AUTHFAIL,
1052 string_sprintf("authentication required but %s", fail_reason), DEFER,
1061 /* Construct AUTH appendix string for MAIL TO */
1064 buffer to build string
1065 addrlist chain of potential addresses to deliver
1066 ob transport options
1068 Globals smtp_authenticated
1069 client_authenticated_sender
1070 Return True on error, otherwise buffer has (possibly empty) terminated string
1074 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1075 smtp_transport_options_block *ob)
1077 uschar *local_authenticated_sender = authenticated_sender;
1080 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1083 if (ob->authenticated_sender != NULL)
1085 uschar *new = expand_string(ob->authenticated_sender);
1088 if (!expand_string_forcedfail)
1090 uschar *message = string_sprintf("failed to expand "
1091 "authenticated_sender: %s", expand_string_message);
1092 set_errno(addrlist, 0, message, DEFER, FALSE);
1096 else if (new[0] != 0) local_authenticated_sender = new;
1099 /* Add the authenticated sender address if present */
1101 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1102 local_authenticated_sender != NULL)
1104 string_format(buffer, bufsize, " AUTH=%s",
1105 auth_xtextencode(local_authenticated_sender,
1106 Ustrlen(local_authenticated_sender)));
1107 client_authenticated_sender = string_copy(local_authenticated_sender);
1117 /*************************************************
1118 * Deliver address list to given host *
1119 *************************************************/
1121 /* If continue_hostname is not null, we get here only when continuing to
1122 deliver down an existing channel. The channel was passed as the standard
1123 input. TLS is never active on a passed channel; the previous process always
1124 closes it down before passing the connection on.
1126 Otherwise, we have to make a connection to the remote host, and do the
1127 initial protocol exchange.
1129 When running as an MUA wrapper, if the sender or any recipient is rejected,
1130 temporarily or permanently, we force failure for all recipients.
1133 addrlist chain of potential addresses to deliver; only those whose
1134 transport_return field is set to PENDING_DEFER are currently
1135 being processed; others should be skipped - they have either
1136 been delivered to an earlier host or IP address, or been
1137 failed by one of them.
1138 host host to deliver to
1139 host_af AF_INET or AF_INET6
1140 port default TCP/IP port to use, in host byte order
1141 interface interface to bind to, or NULL
1142 tblock transport instance block
1143 copy_host TRUE if host set in addr->host_used must be copied, because
1144 it is specific to this call of the transport
1145 message_defer set TRUE if yield is OK, but all addresses were deferred
1146 because of a non-recipient, non-host failure, that is, a
1147 4xx response to MAIL FROM, DATA, or ".". This is a defer
1148 that is specific to the message.
1149 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1150 a second attempt after TLS initialization fails
1152 Returns: OK - the connection was made and the delivery attempted;
1153 the result for each address is in its data block.
1154 DEFER - the connection could not be made, or something failed
1155 while setting up the SMTP session, or there was a
1156 non-message-specific error, such as a timeout.
1157 ERROR - a filter command is specified for this transport,
1158 and there was a problem setting it up; OR helo_data
1159 or add_headers or authenticated_sender is specified
1160 for this transport, and the string failed to expand
1164 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1165 uschar *interface, transport_instance *tblock, BOOL copy_host,
1166 BOOL *message_defer, BOOL suppress_tls)
1169 address_item *sync_addr;
1170 address_item *first_addr = addrlist;
1175 time_t start_delivery_time = time(NULL);
1176 smtp_transport_options_block *ob =
1177 (smtp_transport_options_block *)(tblock->options_block);
1178 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1179 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1181 BOOL send_rset = TRUE;
1182 BOOL send_quit = TRUE;
1183 BOOL setting_up = TRUE;
1184 BOOL completed_address = FALSE;
1187 BOOL pass_message = FALSE;
1188 #ifdef EXPERIMENTAL_PRDR
1189 BOOL prdr_offered = FALSE;
1192 smtp_inblock inblock;
1193 smtp_outblock outblock;
1194 int max_rcpt = tblock->max_addresses;
1195 uschar *igquotstr = US"";
1196 uschar *helo_data = NULL;
1197 uschar *message = NULL;
1198 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1200 uschar buffer[4096];
1201 uschar inbuffer[4096];
1202 uschar outbuffer[1024];
1204 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1206 *message_defer = FALSE;
1207 smtp_command = US"initial connection";
1208 if (max_rcpt == 0) max_rcpt = 999999;
1210 /* Set up the buffer for reading SMTP response packets. */
1212 inblock.buffer = inbuffer;
1213 inblock.buffersize = sizeof(inbuffer);
1214 inblock.ptr = inbuffer;
1215 inblock.ptrend = inbuffer;
1217 /* Set up the buffer for holding SMTP commands while pipelining */
1219 outblock.buffer = outbuffer;
1220 outblock.buffersize = sizeof(outbuffer);
1221 outblock.ptr = outbuffer;
1222 outblock.cmd_count = 0;
1223 outblock.authenticating = FALSE;
1225 /* Reset the parameters of a TLS session. */
1228 tls_out.cipher = NULL; /* the one we may use for this transport */
1229 tls_out.ourcert = NULL;
1230 tls_out.peercert = NULL;
1231 tls_out.peerdn = NULL;
1232 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1236 /* Flip the legacy TLS-related variables over to the outbound set in case
1237 they're used in the context of the transport. Don't bother resetting
1238 afterward as we're in a subprocess. */
1240 tls_modify_variables(&tls_out);
1245 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1250 /* Make a connection to the host if this isn't a continued delivery, and handle
1251 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1252 specially so they can be identified for retries. */
1254 if (continue_hostname == NULL)
1256 inblock.sock = outblock.sock =
1257 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1258 ob->keepalive, ob->dscp); /* This puts port into host->port */
1260 if (inblock.sock < 0)
1262 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1263 NULL, DEFER, FALSE);
1267 /* Expand the greeting message while waiting for the initial response. (Makes
1268 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1269 delayed till here so that $sending_interface and $sending_port are set. */
1271 helo_data = expand_string(ob->helo_data);
1273 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1274 is nevertheless a reasonably clean way of programming this kind of logic,
1275 where you want to escape on any error. */
1279 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1280 ob->command_timeout)) goto RESPONSE_FAILED;
1282 /* Now check if the helo_data expansion went well, and sign off cleanly if
1285 if (helo_data == NULL)
1287 uschar *message = string_sprintf("failed to expand helo_data: %s",
1288 expand_string_message);
1289 set_errno(addrlist, 0, message, DEFER, FALSE);
1295 /** Debugging without sending a message
1296 addrlist->transport_return = DEFER;
1300 /* Errors that occur after this point follow an SMTP command, which is
1301 left in big_buffer by smtp_write_command() for use in error messages. */
1303 smtp_command = big_buffer;
1305 /* Tell the remote who we are...
1307 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1308 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1309 greeting is of this form. The assumption was that the far end supports it
1310 properly... but experience shows that there are some that give 5xx responses,
1311 even though the banner includes "ESMTP" (there's a bloody-minded one that
1312 says "ESMTP not spoken here"). Cope with that case.
1314 September 2000: Time has passed, and it seems reasonable now to always send
1315 EHLO at the start. It is also convenient to make the change while installing
1318 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1319 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1320 would be no way to send out the mails, so there is now a host list
1321 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1322 PIPELINING problem as well. Maybe it can also be useful to cure other
1323 problems with broken servers.
1325 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1326 Then somebody tried it with a Microsoft mailer... It seems that all other
1327 mailers use upper case for some reason (the RFC is quite clear about case
1328 independence) so, for peace of mind, I gave in. */
1330 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1331 host->name, host->address, NULL) != OK;
1333 /* Alas; be careful, since this goto is not an error-out, so conceivably
1334 we might set data between here and the target which we assume to exist
1335 and be usable. I can see this coming back to bite us. */
1340 suppress_tls = FALSE;
1341 ob->tls_tempfail_tryclear = FALSE;
1342 smtp_command = US"SSL-on-connect";
1349 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1350 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1352 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1353 ob->command_timeout))
1355 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1362 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1367 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1369 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1370 ob->command_timeout)) goto RESPONSE_FAILED;
1373 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1374 lmtp_ignore_quota option was set. */
1376 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1377 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1378 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1380 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1383 tls_offered = esmtp &&
1384 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1385 PCRE_EOPT, NULL, 0) >= 0;
1388 #ifdef EXPERIMENTAL_PRDR
1389 prdr_offered = esmtp &&
1390 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1391 PCRE_EOPT, NULL, 0) >= 0) &&
1392 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1393 host->address, NULL) == OK);
1396 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1400 /* For continuing deliveries down the same channel, the socket is the standard
1401 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1402 below). Set up the pointer to where subsequent commands will be left, for
1403 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1404 set from the command line if they were set in the process that passed the
1409 inblock.sock = outblock.sock = fileno(stdin);
1410 smtp_command = big_buffer;
1411 host->port = port; /* Record the port that was used */
1414 /* If TLS is available on this connection, whether continued or not, attempt to
1415 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1416 send another EHLO - the server may give a different answer in secure mode. We
1417 use a separate buffer for reading the response to STARTTLS so that if it is
1418 negative, the original EHLO data is available for subsequent analysis, should
1419 the client not be required to use TLS. If the response is bad, copy the buffer
1420 for error analysis. */
1423 if (tls_offered && !suppress_tls &&
1424 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1425 host->address, NULL) != OK)
1427 uschar buffer2[4096];
1428 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1431 /* If there is an I/O error, transmission of this message is deferred. If
1432 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1433 false, we also defer. However, if there is a temporary rejection of STARTTLS
1434 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1435 STARTTLS, we carry on. This means we will try to send the message in clear,
1436 unless the host is in hosts_require_tls (tested below). */
1438 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1439 ob->command_timeout))
1441 if (errno != 0 || buffer2[0] == 0 ||
1442 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1444 Ustrncpy(buffer, buffer2, sizeof(buffer));
1445 goto RESPONSE_FAILED;
1449 /* STARTTLS accepted: try to negotiate a TLS session. */
1454 int rc = tls_client_start(inblock.sock, host, addrlist, ob);
1456 /* TLS negotiation failed; give an error. From outside, this function may
1457 be called again to try in clear on a new connection, if the options permit
1458 it for this host. */
1462 save_errno = ERRNO_TLSFAILURE;
1463 message = US"failure while setting up TLS session";
1468 /* TLS session is set up */
1470 for (addr = addrlist; addr != NULL; addr = addr->next)
1472 if (addr->transport_return == PENDING_DEFER)
1474 addr->cipher = tls_out.cipher;
1475 addr->ourcert = tls_out.ourcert;
1476 addr->peercert = tls_out.peercert;
1477 addr->peerdn = tls_out.peerdn;
1483 /* if smtps, we'll have smtp_command set to something else; always safe to
1485 smtp_command = big_buffer;
1487 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1488 helo_data is null, we are dealing with a connection that was passed from
1489 another process, and so we won't have expanded helo_data above. We have to
1490 expand it here. $sending_ip_address and $sending_port are set up right at the
1491 start of the Exim process (in exim.c). */
1493 if (tls_out.active >= 0)
1496 if (helo_data == NULL)
1498 helo_data = expand_string(ob->helo_data);
1499 if (helo_data == NULL)
1501 uschar *message = string_sprintf("failed to expand helo_data: %s",
1502 expand_string_message);
1503 set_errno(addrlist, 0, message, DEFER, FALSE);
1509 /* For SMTPS we need to wait for the initial OK response. */
1512 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1513 ob->command_timeout)) goto RESPONSE_FAILED;
1517 greeting_cmd = "EHLO";
1520 greeting_cmd = "HELO";
1522 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1525 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1526 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1528 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1529 ob->command_timeout))
1530 goto RESPONSE_FAILED;
1533 /* If the host is required to use a secure channel, ensure that we
1536 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1537 host->address, NULL) == OK)
1539 save_errno = ERRNO_TLSREQUIRED;
1540 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1541 host->name, host->address,
1542 tls_offered? "an attempt to start TLS failed" :
1543 "the server did not offer TLS support");
1548 /* If TLS is active, we have just started it up and re-done the EHLO command,
1549 so its response needs to be analyzed. If TLS is not active and this is a
1550 continued session down a previously-used socket, we haven't just done EHLO, so
1553 if (continue_hostname == NULL
1555 || tls_out.active >= 0
1559 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1560 lmtp_ignore_quota option was set. */
1562 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1563 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1564 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1566 /* If the response to EHLO specified support for the SIZE parameter, note
1567 this, provided size_addition is non-negative. */
1569 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1570 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1571 PCRE_EOPT, NULL, 0) >= 0;
1573 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1574 the current host, esmtp will be false, so PIPELINING can never be used. If
1575 the current host matches hosts_avoid_pipelining, don't do it. */
1577 smtp_use_pipelining = esmtp &&
1578 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1579 host->address, NULL) != OK &&
1580 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1581 PCRE_EOPT, NULL, 0) >= 0;
1583 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1584 smtp_use_pipelining? "" : "not ");
1586 #ifdef EXPERIMENTAL_PRDR
1587 prdr_offered = esmtp &&
1588 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1589 PCRE_EOPT, NULL, 0) >= 0 &&
1590 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1591 host->address, NULL) == OK;
1594 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1597 /* Note if the response to EHLO specifies support for the AUTH extension.
1598 If it has, check that this host is one we want to authenticate to, and do
1599 the business. The host name and address must be available when the
1600 authenticator's client driver is running. */
1602 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1603 ob, esmtp, &inblock, &outblock))
1605 default: goto SEND_QUIT;
1607 case FAIL_SEND: goto SEND_FAILED;
1608 case FAIL: goto RESPONSE_FAILED;
1612 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1613 message-specific. */
1617 /* If there is a filter command specified for this transport, we can now
1618 set it up. This cannot be done until the identify of the host is known. */
1620 if (tblock->filter_command != NULL)
1624 sprintf(CS buffer, "%.50s transport", tblock->name);
1625 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1626 TRUE, DEFER, addrlist, buffer, NULL);
1627 transport_filter_timeout = tblock->filter_timeout;
1629 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1634 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1642 /* For messages that have more than the maximum number of envelope recipients,
1643 we want to send several transactions down the same SMTP connection. (See
1644 comments in deliver.c as to how this reconciles, heuristically, with
1645 remote_max_parallel.) This optimization was added to Exim after the following
1646 code was already working. The simplest way to put it in without disturbing the
1647 code was to use a goto to jump back to this point when there is another
1648 transaction to handle. */
1651 sync_addr = first_addr;
1655 completed_address = FALSE;
1658 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1659 qualification, send it, adding something to the message size to allow for
1660 imprecision and things that get added en route. Exim keeps the number of lines
1661 in a message, so we can give an accurate value for the original message, but we
1662 need some additional to handle added headers. (Double "." characters don't get
1663 included in the count.) */
1670 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1674 #ifdef EXPERIMENTAL_PRDR
1675 prdr_active = FALSE;
1678 for (addr = first_addr; addr; addr = addr->next)
1679 if (addr->transport_return == PENDING_DEFER)
1681 for (addr = addr->next; addr; addr = addr->next)
1682 if (addr->transport_return == PENDING_DEFER)
1683 { /* at least two recipients to send */
1685 sprintf(CS p, " PRDR"); p += 5;
1686 goto prdr_is_active;
1694 /* If an authenticated_sender override has been specified for this transport
1695 instance, expand it. If the expansion is forced to fail, and there was already
1696 an authenticated_sender for this message, the original value will be used.
1697 Other expansion failures are serious. An empty result is ignored, but there is
1698 otherwise no check - this feature is expected to be used with LMTP and other
1699 cases where non-standard addresses (e.g. without domains) might be required. */
1701 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1704 /* From here until we send the DATA command, we can make use of PIPELINING
1705 if the server host supports it. The code has to be able to check the responses
1706 at any point, for when the buffer fills up, so we write it totally generally.
1707 When PIPELINING is off, each command written reports that it has flushed the
1710 pending_MAIL = TRUE; /* The block starts with MAIL */
1712 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1713 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1714 mail_command = string_copy(big_buffer); /* Save for later error message */
1718 case -1: /* Transmission error */
1721 case +1: /* Block was sent */
1722 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1723 ob->command_timeout))
1725 if (errno == 0 && buffer[0] == '4')
1727 errno = ERRNO_MAIL4XX;
1728 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1730 goto RESPONSE_FAILED;
1732 pending_MAIL = FALSE;
1736 /* Pass over all the relevant recipient addresses for this host, which are the
1737 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1738 several before we have to read the responses for those seen so far. This
1739 checking is done by a subroutine because it also needs to be done at the end.
1740 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1741 the next one if not all are sent.
1743 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1744 last address because we want to abort if any recipients have any kind of
1745 problem, temporary or permanent. We know that all recipient addresses will have
1746 the PENDING_DEFER status, because only one attempt is ever made, and we know
1747 that max_rcpt will be large, so all addresses will be done at once. */
1749 for (addr = first_addr;
1750 address_count < max_rcpt && addr != NULL;
1756 if (addr->transport_return != PENDING_DEFER) continue;
1759 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1761 /* Now send the RCPT command, and process outstanding responses when
1762 necessary. After a timeout on RCPT, we just end the function, leaving the
1763 yield as OK, because this error can often mean that there is a problem with
1764 just one address, so we don't want to delay the host. */
1766 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1767 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1768 if (count < 0) goto SEND_FAILED;
1771 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1772 &sync_addr, host, count, ob->address_retry_include_sender,
1773 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1776 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1777 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1780 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1781 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1782 case 0: /* No 2xx or 5xx, but no probs */
1785 case -1: goto END_OFF; /* Timeout on RCPT */
1786 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1788 pending_MAIL = FALSE; /* Dealt with MAIL */
1790 } /* Loop for next address */
1792 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1793 permanently or temporarily. We should have flushed and synced after the last
1798 address_item *badaddr;
1799 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1801 if (badaddr->transport_return != PENDING_OK) break;
1803 if (badaddr != NULL)
1805 set_errno(addrlist, 0, badaddr->message, FAIL,
1806 testflag(badaddr, af_pass_message));
1811 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1812 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1813 have a good recipient buffered up if we are pipelining. We don't want to waste
1814 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1815 are pipelining. The responses are all handled by sync_responses(). */
1817 if (ok || (smtp_use_pipelining && !mua_wrapper))
1819 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1820 if (count < 0) goto SEND_FAILED;
1821 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1822 host, count, ob->address_retry_include_sender, pending_MAIL,
1823 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1825 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1826 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1829 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1830 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1831 case 0: break; /* No 2xx or 5xx, but no probs */
1833 case -1: goto END_OFF; /* Timeout on RCPT */
1834 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1838 /* Save the first address of the next batch. */
1842 /* If there were no good recipients (but otherwise there have been no
1843 problems), just set ok TRUE, since we have handled address-specific errors
1844 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1845 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1846 well as body. Set the appropriate timeout value to be used for each chunk.
1847 (Haven't been able to make it work using select() for writing yet.) */
1849 if (!ok) ok = TRUE; else
1851 sigalrm_seen = FALSE;
1852 transport_write_timeout = ob->data_timeout;
1853 smtp_command = US"sending data block"; /* For error messages */
1854 DEBUG(D_transport|D_v)
1855 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1856 transport_count = 0;
1857 #ifndef DISABLE_DKIM
1858 ok = dkim_transport_write_message(addrlist, inblock.sock,
1859 topt_use_crlf | topt_end_dot | topt_escape_headers |
1860 (tblock->body_only? topt_no_headers : 0) |
1861 (tblock->headers_only? topt_no_body : 0) |
1862 (tblock->return_path_add? topt_add_return_path : 0) |
1863 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1864 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1865 0, /* No size limit */
1866 tblock->add_headers, tblock->remove_headers,
1867 US".", US"..", /* Escaping strings */
1868 tblock->rewrite_rules, tblock->rewrite_existflags,
1869 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1870 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1873 ok = transport_write_message(addrlist, inblock.sock,
1874 topt_use_crlf | topt_end_dot | topt_escape_headers |
1875 (tblock->body_only? topt_no_headers : 0) |
1876 (tblock->headers_only? topt_no_body : 0) |
1877 (tblock->return_path_add? topt_add_return_path : 0) |
1878 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1879 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1880 0, /* No size limit */
1881 tblock->add_headers, tblock->remove_headers,
1882 US".", US"..", /* Escaping strings */
1883 tblock->rewrite_rules, tblock->rewrite_existflags);
1886 /* transport_write_message() uses write() because it is called from other
1887 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1888 it can exit with "Broken pipe" as its error. This really means that the
1889 socket got closed at the far end. */
1891 transport_write_timeout = 0; /* for subsequent transports */
1893 /* Failure can either be some kind of I/O disaster (including timeout),
1894 or the failure of a transport filter or the expansion of added headers. */
1898 buffer[0] = 0; /* There hasn't been a response */
1899 goto RESPONSE_FAILED;
1902 /* We used to send the terminating "." explicitly here, but because of
1903 buffering effects at both ends of TCP/IP connections, you don't gain
1904 anything by keeping it separate, so it might as well go in the final
1905 data buffer for efficiency. This is now done by setting the topt_end_dot
1908 smtp_command = US"end of data";
1910 #ifdef EXPERIMENTAL_PRDR
1911 /* For PRDR we optionally get a partial-responses warning
1912 * followed by the individual responses, before going on with
1913 * the overall response. If we don't get the warning then deal
1914 * with per non-PRDR. */
1917 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1919 if (!ok && errno == 0)
1922 case '2': prdr_active = FALSE;
1925 case '4': errno = ERRNO_DATA4XX;
1926 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1933 /* For non-PRDR SMTP, we now read a single response that applies to the
1934 whole message. If it is OK, then all the addresses have been delivered. */
1938 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1940 if (!ok && errno == 0 && buffer[0] == '4')
1942 errno = ERRNO_DATA4XX;
1943 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1947 /* For LMTP, we get back a response for every RCPT command that we sent;
1948 some may be accepted and some rejected. For those that get a response, their
1949 status is fixed; any that are accepted have been handed over, even if later
1950 responses crash - at least, that's how I read RFC 2033.
1952 If all went well, mark the recipient addresses as completed, record which
1953 host/IPaddress they were delivered to, and cut out RSET when sending another
1954 message down the same channel. Write the completed addresses to the journal
1955 now so that they are recorded in case there is a crash of hardware or
1956 software before the spool gets updated. Also record the final SMTP
1957 confirmation if needed (for SMTP only). */
1962 int delivery_time = (int)(time(NULL) - start_delivery_time);
1965 uschar *conf = NULL;
1968 /* Make a copy of the host if it is local to this invocation
1969 of the transport. */
1973 thost = store_get(sizeof(host_item));
1975 thost->name = string_copy(host->name);
1976 thost->address = string_copy(host->address);
1980 /* Set up confirmation if needed - applies only to SMTP */
1983 #ifndef EXPERIMENTAL_TPDA
1984 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1989 uschar *s = string_printing(buffer);
1990 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1993 /* Process all transported addresses - for LMTP or PRDR, read a status for
1996 for (addr = addrlist; addr != first_addr; addr = addr->next)
1998 if (addr->transport_return != PENDING_OK) continue;
2000 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2001 remaining addresses. Otherwise, it's a return code for just the one
2002 address. For temporary errors, add a retry item for the address so that
2003 it doesn't get tried again too soon. */
2005 #ifdef EXPERIMENTAL_PRDR
2006 if (lmtp || prdr_active)
2011 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2014 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2015 addr->message = string_sprintf(
2016 #ifdef EXPERIMENTAL_PRDR
2017 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2019 "LMTP error after %s: %s",
2021 big_buffer, string_printing(buffer));
2022 setflag(addr, af_pass_message); /* Allow message to go to user */
2023 if (buffer[0] == '5')
2024 addr->transport_return = FAIL;
2027 errno = ERRNO_DATA4XX;
2028 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2029 addr->transport_return = DEFER;
2030 #ifdef EXPERIMENTAL_PRDR
2033 retry_add_item(addr, addr->address_retry_key, 0);
2037 completed_address = TRUE; /* NOW we can set this flag */
2038 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2040 uschar *s = string_printing(buffer);
2041 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2045 /* SMTP, or success return from LMTP for this address. Pass back the
2046 actual host that was used. */
2048 addr->transport_return = OK;
2049 addr->more_errno = delivery_time;
2050 addr->host_used = thost;
2051 addr->special_action = flag;
2052 addr->message = conf;
2053 #ifdef EXPERIMENTAL_PRDR
2054 if (prdr_active) addr->flags |= af_prdr_used;
2058 #ifdef EXPERIMENTAL_PRDR
2062 /* Update the journal. For homonymic addresses, use the base address plus
2063 the transport name. See lots of comments in deliver.c about the reasons
2064 for the complications when homonyms are involved. Just carry on after
2065 write error, as it may prove possible to update the spool file later. */
2067 if (testflag(addr, af_homonym))
2068 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2070 sprintf(CS buffer, "%.500s\n", addr->unique);
2072 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2073 len = Ustrlen(CS buffer);
2074 if (write(journal_fd, buffer, len) != len)
2075 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2076 "%s: %s", buffer, strerror(errno));
2080 #ifdef EXPERIMENTAL_PRDR
2083 /* PRDR - get the final, overall response. For any non-success
2084 upgrade all the address statuses. */
2085 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2089 if(errno == 0 && buffer[0] == '4')
2091 errno = ERRNO_DATA4XX;
2092 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2094 for (addr = addrlist; addr != first_addr; addr = addr->next)
2095 if (buffer[0] == '5' || addr->transport_return == OK)
2096 addr->transport_return = PENDING_OK; /* allow set_errno action */
2097 goto RESPONSE_FAILED;
2100 /* Update the journal, or setup retry. */
2101 for (addr = addrlist; addr != first_addr; addr = addr->next)
2102 if (addr->transport_return == OK)
2104 if (testflag(addr, af_homonym))
2105 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2107 sprintf(CS buffer, "%.500s\n", addr->unique);
2109 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2110 len = Ustrlen(CS buffer);
2111 if (write(journal_fd, buffer, len) != len)
2112 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2113 "%s: %s", buffer, strerror(errno));
2115 else if (addr->transport_return == DEFER)
2116 retry_add_item(addr, addr->address_retry_key, -2);
2120 /* Ensure the journal file is pushed out to disk. */
2122 if (EXIMfsync(journal_fd) < 0)
2123 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2129 /* Handle general (not specific to one address) failures here. The value of ok
2130 is used to skip over this code on the falling through case. A timeout causes a
2131 deferral. Other errors may defer or fail according to the response code, and
2132 may set up a special errno value, e.g. after connection chopped, which is
2133 assumed if errno == 0 and there is no text in the buffer. If control reaches
2134 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2135 the problem is not related to this specific message. */
2144 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2145 buffer, &code, &message, &pass_message);
2151 message = US string_sprintf("send() to %s [%s] failed: %s",
2152 host->name, host->address, strerror(save_errno));
2156 /* This label is jumped to directly when a TLS negotiation has failed,
2157 or was not done for a host for which it is required. Values will be set
2158 in message and save_errno, and setting_up will always be true. Treat as
2159 a temporary error. */
2166 /* If the failure happened while setting up the call, see if the failure was
2167 a 5xx response (this will either be on connection, or following HELO - a 5xx
2168 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2169 never going to accept them. For other errors during setting up (timeouts or
2170 whatever), defer all addresses, and yield DEFER, so that the host is not
2171 tried again for a while. */
2174 ok = FALSE; /* For when reached by GOTO */
2180 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2184 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2189 /* We want to handle timeouts after MAIL or "." and loss of connection after
2190 "." specially. They can indicate a problem with the sender address or with
2191 the contents of the message rather than a real error on the connection. These
2192 cases are treated in the same way as a 4xx response. This next bit of code
2193 does the classification. */
2204 message_error = TRUE;
2208 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2209 Ustrncmp(smtp_command,"end ",4) == 0;
2212 case ERRNO_SMTPCLOSED:
2213 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2217 message_error = FALSE;
2221 /* Handle the cases that are treated as message errors. These are:
2223 (a) negative response or timeout after MAIL
2224 (b) negative response after DATA
2225 (c) negative response or timeout or dropped connection after "."
2227 It won't be a negative response or timeout after RCPT, as that is dealt
2228 with separately above. The action in all cases is to set an appropriate
2229 error code for all the addresses, but to leave yield set to OK because the
2230 host itself has not failed. Of course, it might in practice have failed
2231 when we've had a timeout, but if so, we'll discover that at the next
2232 delivery attempt. For a temporary error, set the message_defer flag, and
2233 write to the logs for information if this is not the last host. The error
2234 for the last host will be logged as part of the address's log line. */
2238 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2239 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2242 /* If there's an errno, the message contains just the identity of
2245 if (code != '5') /* Anything other than 5 is treated as temporary */
2248 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2249 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2250 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2251 *message_defer = TRUE;
2255 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2256 ".", or some other transportation error. We defer all addresses and yield
2257 DEFER, except for the case of failed add_headers expansion, or a transport
2258 filter failure, when the yield should be ERROR, to stop it trying other
2263 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2264 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2265 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2271 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2272 SMTP session tidily. However, if there were too many addresses to send in one
2273 message (indicated by first_addr being non-NULL) we want to carry on with the
2274 rest of them. Also, it is desirable to send more than one message down the SMTP
2275 connection if there are several waiting, provided we haven't already sent so
2276 many as to hit the configured limit. The function transport_check_waiting looks
2277 for a waiting message and returns its id. Then transport_pass_socket tries to
2278 set up a continued delivery by passing the socket on to another process. The
2279 variable send_rset is FALSE if a message has just been successfully transfered.
2281 If we are already sending down a continued channel, there may be further
2282 addresses not yet delivered that are aimed at the same host, but which have not
2283 been passed in this run of the transport. In this case, continue_more will be
2284 true, and all we should do is send RSET if necessary, and return, leaving the
2287 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2288 do not want to continue with other messages down the same channel, because that
2289 can lead to looping between two or more messages, all with the same,
2290 temporarily failing address(es). [The retry information isn't updated yet, so
2291 new processes keep on trying.] We probably also don't want to try more of this
2292 message's addresses either.
2294 If we have started a TLS session, we have to end it before passing the
2295 connection to a new process. However, not all servers can handle this (Exim
2296 can), so we do not pass such a connection on if the host matches
2297 hosts_nopass_tls. */
2300 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2301 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2302 continue_more, yield, (first_addr == NULL)? "":"not ");
2304 if (completed_address && ok && send_quit)
2307 if (first_addr != NULL || continue_more ||
2309 (tls_out.active < 0 ||
2310 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2311 host->address, NULL) != OK)
2313 transport_check_waiting(tblock->name, host->name,
2314 tblock->connection_max_messages, new_message_id, &more)
2322 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2324 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2325 host->address, strerror(save_errno));
2328 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2329 ob->command_timeout)))
2332 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2336 DEBUG(D_transport) debug_printf("%s\n", msg);
2341 /* Either RSET was not needed, or it succeeded */
2345 if (first_addr != NULL) /* More addresses still to be sent */
2346 { /* in this run of the transport */
2347 continue_sequence++; /* Causes * in logging */
2350 if (continue_more) return yield; /* More addresses for another run */
2352 /* Pass the socket to a new Exim process. Before doing so, we must shut
2353 down TLS. Not all MTAs allow for the continuation of the SMTP session
2354 when TLS is shut down. We test for this by sending a new EHLO. If we
2355 don't get a good response, we don't attempt to pass the socket on. */
2358 if (tls_out.active >= 0)
2360 tls_close(FALSE, TRUE);
2364 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2365 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2366 ob->command_timeout);
2370 /* If the socket is successfully passed, we musn't send QUIT (or
2371 indeed anything!) from here. */
2373 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2374 new_message_id, inblock.sock))
2380 /* If RSET failed and there are addresses left, they get deferred. */
2382 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2386 /* End off tidily with QUIT unless the connection has died or the socket has
2387 been passed to another process. There has been discussion on the net about what
2388 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2389 to wait for a response, but on the other hand, there isn't anything one can do
2390 with an error response, other than log it. Exim used to do that. However,
2391 further discussion suggested that it is positively advantageous not to wait for
2392 the response, but to close the session immediately. This is supposed to move
2393 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2394 load from the server. (Hosts that are both servers and clients may not see much
2395 difference, of course.) Further discussion indicated that this was safe to do
2396 on Unix systems which have decent implementations of TCP/IP that leave the
2397 connection around for a while (TIME_WAIT) after the application has gone away.
2398 This enables the response sent by the server to be properly ACKed rather than
2399 timed out, as can happen on broken TCP/IP implementations on other OS.
2401 This change is being made on 31-Jul-98. After over a year of trouble-free
2402 operation, the old commented-out code was removed on 17-Sep-99. */
2405 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2410 tls_close(FALSE, TRUE);
2413 /* Close the socket, and return the appropriate value, first setting
2414 works because the NULL setting is passed back to the calling process, and
2415 remote_max_parallel is forced to 1 when delivering over an existing connection,
2417 If all went well and continue_more is set, we shouldn't actually get here if
2418 there are further addresses, as the return above will be taken. However,
2419 writing RSET might have failed, or there may be other addresses whose hosts are
2420 specified in the transports, and therefore not visible at top level, in which
2421 case continue_more won't get set. */
2423 (void)close(inblock.sock);
2424 continue_transport = NULL;
2425 continue_hostname = NULL;
2432 /*************************************************
2433 * Closedown entry point *
2434 *************************************************/
2436 /* This function is called when exim is passed an open smtp channel
2437 from another incarnation, but the message which it has been asked
2438 to deliver no longer exists. The channel is on stdin.
2440 We might do fancy things like looking for another message to send down
2441 the channel, but if the one we sought has gone, it has probably been
2442 delivered by some other process that itself will seek further messages,
2443 so just close down our connection.
2445 Argument: pointer to the transport instance block
2450 smtp_transport_closedown(transport_instance *tblock)
2452 smtp_transport_options_block *ob =
2453 (smtp_transport_options_block *)(tblock->options_block);
2454 smtp_inblock inblock;
2455 smtp_outblock outblock;
2457 uschar inbuffer[4096];
2458 uschar outbuffer[16];
2460 inblock.sock = fileno(stdin);
2461 inblock.buffer = inbuffer;
2462 inblock.buffersize = sizeof(inbuffer);
2463 inblock.ptr = inbuffer;
2464 inblock.ptrend = inbuffer;
2466 outblock.sock = inblock.sock;
2467 outblock.buffersize = sizeof(outbuffer);
2468 outblock.buffer = outbuffer;
2469 outblock.ptr = outbuffer;
2470 outblock.cmd_count = 0;
2471 outblock.authenticating = FALSE;
2473 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2474 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2475 ob->command_timeout);
2476 (void)close(inblock.sock);
2481 /*************************************************
2482 * Prepare addresses for delivery *
2483 *************************************************/
2485 /* This function is called to flush out error settings from previous delivery
2486 attempts to other hosts. It also records whether we got here via an MX record
2487 or not in the more_errno field of the address. We are interested only in
2488 addresses that are still marked DEFER - others may have got delivered to a
2489 previously considered IP address. Set their status to PENDING_DEFER to indicate
2490 which ones are relevant this time.
2493 addrlist the list of addresses
2494 host the host we are delivering to
2496 Returns: the first address for this delivery
2499 static address_item *
2500 prepare_addresses(address_item *addrlist, host_item *host)
2502 address_item *first_addr = NULL;
2504 for (addr = addrlist; addr != NULL; addr = addr->next)
2506 if (addr->transport_return != DEFER) continue;
2507 if (first_addr == NULL) first_addr = addr;
2508 addr->transport_return = PENDING_DEFER;
2509 addr->basic_errno = 0;
2510 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2511 addr->message = NULL;
2513 addr->cipher = NULL;
2514 addr->ourcert = NULL;
2515 addr->peercert = NULL;
2516 addr->peerdn = NULL;
2524 /*************************************************
2525 * Main entry point *
2526 *************************************************/
2528 /* See local README for interface details. As this is a remote transport, it is
2529 given a chain of addresses to be delivered in one connection, if possible. It
2530 always returns TRUE, indicating that each address has its own independent
2531 status set, except if there is a setting up problem, in which case it returns
2535 smtp_transport_entry(
2536 transport_instance *tblock, /* data for this instantiation */
2537 address_item *addrlist) /* addresses we are working on */
2541 int hosts_defer = 0;
2543 int hosts_looked_up = 0;
2544 int hosts_retry = 0;
2545 int hosts_serial = 0;
2546 int hosts_total = 0;
2547 int total_hosts_tried = 0;
2549 BOOL expired = TRUE;
2550 BOOL continuing = continue_hostname != NULL;
2551 uschar *expanded_hosts = NULL;
2553 uschar *tid = string_sprintf("%s transport", tblock->name);
2554 smtp_transport_options_block *ob =
2555 (smtp_transport_options_block *)(tblock->options_block);
2556 host_item *hostlist = addrlist->host_list;
2557 host_item *host = NULL;
2561 debug_printf("%s transport entered\n", tblock->name);
2562 for (addr = addrlist; addr != NULL; addr = addr->next)
2563 debug_printf(" %s\n", addr->address);
2564 if (continuing) debug_printf("already connected to %s [%s]\n",
2565 continue_hostname, continue_host_address);
2568 /* Set the flag requesting that these hosts be added to the waiting
2569 database if the delivery fails temporarily or if we are running with
2570 queue_smtp or a 2-stage queue run. This gets unset for certain
2571 kinds of error, typically those that are specific to the message. */
2573 update_waiting = TRUE;
2575 /* If a host list is not defined for the addresses - they must all have the
2576 same one in order to be passed to a single transport - or if the transport has
2577 a host list with hosts_override set, use the host list supplied with the
2578 transport. It is an error for this not to exist. */
2580 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2582 if (ob->hosts == NULL)
2584 addrlist->message = string_sprintf("%s transport called with no hosts set",
2586 addrlist->transport_return = PANIC;
2587 return FALSE; /* Only top address has status */
2590 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2593 /* If the transport's host list contains no '$' characters, and we are not
2594 randomizing, it is fixed and therefore a chain of hosts can be built once
2595 and for all, and remembered for subsequent use by other calls to this
2596 transport. If, on the other hand, the host list does contain '$', or we are
2597 randomizing its order, we have to rebuild it each time. In the fixed case,
2598 as the hosts string will never be used again, it doesn't matter that we
2599 replace all the : characters with zeros. */
2601 if (ob->hostlist == NULL)
2603 uschar *s = ob->hosts;
2605 if (Ustrchr(s, '$') != NULL)
2607 expanded_hosts = expand_string(s);
2608 if (expanded_hosts == NULL)
2610 addrlist->message = string_sprintf("failed to expand list of hosts "
2611 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2612 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2613 return FALSE; /* Only top address has status */
2615 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2616 "\"%s\"\n", s, expanded_hosts);
2620 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2622 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2624 /* Check that the expansion yielded something useful. */
2625 if (hostlist == NULL)
2628 string_sprintf("%s transport has empty hosts setting", tblock->name);
2629 addrlist->transport_return = PANIC;
2630 return FALSE; /* Only top address has status */
2633 /* If there was no expansion of hosts, save the host list for
2636 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2639 /* This is not the first time this transport has been run in this delivery;
2640 the host list was built previously. */
2642 else hostlist = ob->hostlist;
2645 /* The host list was supplied with the address. If hosts_randomize is set, we
2646 must sort it into a random order if it did not come from MX records and has not
2647 already been randomized (but don't bother if continuing down an existing
2650 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2652 host_item *newlist = NULL;
2653 while (hostlist != NULL)
2655 host_item *h = hostlist;
2656 hostlist = hostlist->next;
2658 h->sort_key = random_number(100);
2660 if (newlist == NULL)
2665 else if (h->sort_key < newlist->sort_key)
2672 host_item *hh = newlist;
2673 while (hh->next != NULL)
2675 if (h->sort_key < hh->next->sort_key) break;
2683 hostlist = addrlist->host_list = newlist;
2687 /* Sort out the default port. */
2689 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2692 /* For each host-plus-IP-address on the list:
2694 . If this is a continued delivery and the host isn't the one with the
2695 current connection, skip.
2697 . If the status is unusable (i.e. previously failed or retry checked), skip.
2699 . If no IP address set, get the address, either by turning the name into
2700 an address, calling gethostbyname if gethostbyname is on, or by calling
2701 the DNS. The DNS may yield multiple addresses, in which case insert the
2702 extra ones into the list.
2704 . Get the retry data if not previously obtained for this address and set the
2705 field which remembers the state of this address. Skip if the retry time is
2706 not reached. If not, remember whether retry data was found. The retry string
2707 contains both the name and the IP address.
2709 . Scan the list of addresses and mark those whose status is DEFER as
2710 PENDING_DEFER. These are the only ones that will be processed in this cycle
2713 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2714 Some addresses may be successfully delivered, others may fail, and yet
2715 others may get temporary errors and so get marked DEFER.
2717 . The return from the delivery attempt is OK if a connection was made and a
2718 valid SMTP dialogue was completed. Otherwise it is DEFER.
2720 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2722 . If fail to connect, or other defer state, add a retry item.
2724 . If there are any addresses whose status is still DEFER, carry on to the
2725 next host/IPaddress, unless we have tried the number of hosts given
2726 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2727 there is some fancy logic for hosts_max_try that means its limit can be
2728 overstepped in some circumstances.
2730 If we get to the end of the list, all hosts have deferred at least one address,
2731 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2732 delivery attempt to those hosts whose last try was before the arrival time of
2733 the current message. To cope with this, we have to go round the loop a second
2734 time. After that, set the status and error data for any addresses that haven't
2735 had it set already. */
2737 for (cutoff_retry = 0; expired &&
2738 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2741 host_item *nexthost = NULL;
2742 int unexpired_hosts_tried = 0;
2744 for (host = hostlist;
2746 unexpired_hosts_tried < ob->hosts_max_try &&
2747 total_hosts_tried < ob->hosts_max_try_hardlimit;
2753 BOOL serialized = FALSE;
2754 BOOL host_is_expired = FALSE;
2755 BOOL message_defer = FALSE;
2756 BOOL ifchanges = FALSE;
2757 BOOL some_deferred = FALSE;
2758 address_item *first_addr = NULL;
2759 uschar *interface = NULL;
2760 uschar *retry_host_key = NULL;
2761 uschar *retry_message_key = NULL;
2762 uschar *serialize_key = NULL;
2764 /* Default next host is next host. :-) But this can vary if the
2765 hosts_max_try limit is hit (see below). It may also be reset if a host
2766 address is looked up here (in case the host was multihomed). */
2768 nexthost = host->next;
2770 /* If the address hasn't yet been obtained from the host name, look it up
2771 now, unless the host is already marked as unusable. If it is marked as
2772 unusable, it means that the router was unable to find its IP address (in
2773 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2774 the lookup failed last time. We don't get this far if *all* MX records
2775 point to non-existent hosts; that is treated as a hard error.
2777 We can just skip this host entirely. When the hosts came from the router,
2778 the address will timeout based on the other host(s); when the address is
2779 looked up below, there is an explicit retry record added.
2781 Note that we mustn't skip unusable hosts if the address is not unset; they
2782 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2784 if (host->address == NULL)
2786 int new_port, flags;
2788 uschar *canonical_name;
2790 if (host->status >= hstatus_unusable)
2792 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2797 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2799 /* The host name is permitted to have an attached port. Find it, and
2800 strip it from the name. Just remember it for now. */
2802 new_port = host_item_get_port(host);
2804 /* Count hosts looked up */
2808 /* Find by name if so configured, or if it's an IP address. We don't
2809 just copy the IP address, because we need the test-for-local to happen. */
2811 flags = HOST_FIND_BY_A;
2812 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2813 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2815 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2816 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2818 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2819 ob->dnssec_request_domains, ob->dnssec_require_domains,
2820 &canonical_name, NULL);
2822 /* Update the host (and any additional blocks, resulting from
2823 multihoming) with a host-specific port, if any. */
2825 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2827 /* Failure to find the host at this time (usually DNS temporary failure)
2828 is really a kind of routing failure rather than a transport failure.
2829 Therefore we add a retry item of the routing kind, not to stop us trying
2830 to look this name up here again, but to ensure the address gets timed
2831 out if the failures go on long enough. A complete failure at this point
2832 commonly points to a configuration error, but the best action is still
2833 to carry on for the next host. */
2835 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2837 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2839 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2840 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2841 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2842 host->status = hstatus_unusable;
2844 for (addr = addrlist; addr != NULL; addr = addr->next)
2846 if (addr->transport_return != DEFER) continue;
2847 addr->basic_errno = ERRNO_UNKNOWNHOST;
2849 string_sprintf("failed to lookup IP address for %s", host->name);
2854 /* If the host is actually the local host, we may have a problem, or
2855 there may be some cunning configuration going on. In the problem case,
2856 log things and give up. The default transport status is already DEFER. */
2858 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2860 for (addr = addrlist; addr != NULL; addr = addr->next)
2862 addr->basic_errno = 0;
2863 addr->message = string_sprintf("%s transport found host %s to be "
2864 "local", tblock->name, host->name);
2868 } /* End of block for IP address lookup */
2870 /* If this is a continued delivery, we are interested only in the host
2871 which matches the name of the existing open channel. The check is put
2872 here after the local host lookup, in case the name gets expanded as a
2873 result of the lookup. Set expired FALSE, to save the outer loop executing
2876 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2877 Ustrcmp(continue_host_address, host->address) != 0))
2880 continue; /* With next host */
2883 /* Reset the default next host in case a multihomed host whose addresses
2884 are not looked up till just above added to the host list. */
2886 nexthost = host->next;
2888 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2889 domain is in queue_smtp_domains, we don't actually want to attempt any
2890 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2891 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2892 were not in it. We don't want to hold up all SMTP deliveries! Except when
2893 doing a two-stage queue run, don't do this if forcing. */
2895 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2896 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2897 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2900 for (addr = addrlist; addr != NULL; addr = addr->next)
2902 if (addr->transport_return != DEFER) continue;
2903 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2905 continue; /* With next host */
2908 /* Count hosts being considered - purely for an intelligent comment
2909 if none are usable. */
2913 /* Set $host and $host address now in case they are needed for the
2914 interface expansion or the serialize_hosts check; they remain set if an
2915 actual delivery happens. */
2917 deliver_host = host->name;
2918 deliver_host_address = host->address;
2920 /* Set up a string for adding to the retry key if the port number is not
2921 the standard SMTP port. A host may have its own port setting that overrides
2924 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2926 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2928 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2929 string changes upon expansion, we must add it to the key that is used for
2930 retries, because connections to the same host from a different interface
2931 should be treated separately. */
2933 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2934 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2937 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2939 /* The first time round the outer loop, check the status of the host by
2940 inspecting the retry data. The second time round, we are interested only
2941 in expired hosts that haven't been tried since this message arrived. */
2943 if (cutoff_retry == 0)
2945 /* Ensure the status of the address is set by checking retry data if
2946 necessary. There maybe host-specific retry data (applicable to all
2947 messages) and also data for retries of a specific message at this host.
2948 If either of these retry records are actually read, the keys used are
2949 returned to save recomputing them later. */
2951 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2952 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2954 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2955 (host->address == NULL)? US"" : host->address, pistring,
2956 (host->status == hstatus_usable)? "usable" :
2957 (host->status == hstatus_unusable)? "unusable" :
2958 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2960 /* Skip this address if not usable at this time, noting if it wasn't
2961 actually expired, both locally and in the address. */
2963 switch (host->status)
2965 case hstatus_unusable:
2967 setflag(addrlist, af_retry_skipped);
2970 case hstatus_unusable_expired:
2973 case hwhy_retry: hosts_retry++; break;
2974 case hwhy_failed: hosts_fail++; break;
2975 case hwhy_deferred: hosts_defer++; break;
2978 /* If there was a retry message key, implying that previously there
2979 was a message-specific defer, we don't want to update the list of
2980 messages waiting for these hosts. */
2982 if (retry_message_key != NULL) update_waiting = FALSE;
2983 continue; /* With the next host or IP address */
2987 /* Second time round the loop: if the address is set but expired, and
2988 the message is newer than the last try, let it through. */
2992 if (host->address == NULL ||
2993 host->status != hstatus_unusable_expired ||
2994 host->last_try > received_time)
2997 debug_printf("trying expired host %s [%s]%s\n",
2998 host->name, host->address, pistring);
2999 host_is_expired = TRUE;
3002 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3003 it remains TRUE only if all hosts are expired and none are actually tried.
3008 /* If this host is listed as one to which access must be serialized,
3009 see if another Exim process has a connection to it, and if so, skip
3010 this host. If not, update the database to record our connection to it
3011 and remember this for later deletion. Do not do any of this if we are
3012 sending the message down a pre-existing connection. */
3015 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3016 host->address, NULL) == OK)
3018 serialize_key = string_sprintf("host-serialize-%s", host->name);
3019 if (!enq_start(serialize_key))
3022 debug_printf("skipping host %s because another Exim process "
3023 "is connected to it\n", host->name);
3030 /* OK, we have an IP address that is not waiting for its retry time to
3031 arrive (it might be expired) OR (second time round the loop) we have an
3032 expired host that hasn't been tried since the message arrived. Have a go
3033 at delivering the message to it. First prepare the addresses by flushing
3034 out the result of previous attempts, and finding the first address that
3035 is still to be delivered. */
3037 first_addr = prepare_addresses(addrlist, host);
3039 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3040 message_id, host->name, host->address, addrlist->address,
3041 (addrlist->next == NULL)? "" : ", ...");
3043 set_process_info("delivering %s to %s [%s] (%s%s)",
3044 message_id, host->name, host->address, addrlist->address,
3045 (addrlist->next == NULL)? "" : ", ...");
3047 /* This is not for real; don't do the delivery. If there are
3048 any remaining hosts, list them. */
3053 set_errno(addrlist, 0, NULL, OK, FALSE);
3054 for (addr = addrlist; addr != NULL; addr = addr->next)
3056 addr->host_used = host;
3057 addr->special_action = '*';
3058 addr->message = US"delivery bypassed by -N option";
3062 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3063 "*** host and remaining hosts:\n", tblock->name);
3064 for (host2 = host; host2 != NULL; host2 = host2->next)
3065 debug_printf(" %s [%s]\n", host2->name,
3066 (host2->address == NULL)? US"unset" : host2->address);
3071 /* This is for real. If the host is expired, we don't count it for
3072 hosts_max_retry. This ensures that all hosts must expire before an address
3073 is timed out, unless hosts_max_try_hardlimit (which protects against
3074 lunatic DNS configurations) is reached.
3076 If the host is not expired and we are about to hit the hosts_max_retry
3077 limit, check to see if there is a subsequent hosts with a different MX
3078 value. If so, make that the next host, and don't count this one. This is a
3079 heuristic to make sure that different MXs do get tried. With a normal kind
3080 of retry rule, they would get tried anyway when the earlier hosts were
3081 delayed, but if the domain has a "retry every time" type of rule - as is
3082 often used for the the very large ISPs, that won't happen. */
3086 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3090 debug_printf("hosts_max_try limit reached with this host\n");
3091 for (h = host; h != NULL; h = h->next)
3092 if (h->mx != host->mx) break;
3096 unexpired_hosts_tried--;
3097 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3098 "and will be tried\n");
3102 /* Attempt the delivery. */
3104 total_hosts_tried++;
3105 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3106 expanded_hosts != NULL, &message_defer, FALSE);
3109 OK => connection made, each address contains its result;
3110 message_defer is set for message-specific defers (when all
3111 recipients are marked defer)
3112 DEFER => there was a non-message-specific delivery problem;
3113 ERROR => there was a problem setting up the arguments for a filter,
3114 or there was a problem with expanding added headers
3117 /* If the result is not OK, there was a non-message-specific problem.
3118 If the result is DEFER, we need to write to the logs saying what happened
3119 for this particular host, except in the case of authentication and TLS
3120 failures, where the log has already been written. If all hosts defer a
3121 general message is written at the end. */
3123 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3124 first_addr->basic_errno != ERRNO_TLSFAILURE)
3125 write_logs(first_addr, host);
3127 #ifdef EXPERIMENTAL_TPDA
3129 tpda_deferred(ob, first_addr, host);
3132 /* If STARTTLS was accepted, but there was a failure in setting up the
3133 TLS session (usually a certificate screwup), and the host is not in
3134 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3135 TLS forcibly turned off. We have to start from scratch with a new SMTP
3136 connection. That's why the retry is done from here, not from within
3137 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3138 session, so the in-clear transmission after those errors, if permitted,
3139 happens inside smtp_deliver().] */
3142 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3143 ob->tls_tempfail_tryclear &&
3144 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3145 host->address, NULL) != OK)
3147 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3148 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3149 first_addr = prepare_addresses(addrlist, host);
3150 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3151 expanded_hosts != NULL, &message_defer, TRUE);
3152 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3153 write_logs(first_addr, host);
3154 #ifdef EXPERIMENTAL_TPDA
3156 tpda_deferred(ob, first_addr, host);
3162 /* Delivery attempt finished */
3164 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3167 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3168 message_id, host->name, host->address, addrlist->address,
3169 (addrlist->next == NULL)? "" : " (& others)", rs);
3171 /* Release serialization if set up */
3173 if (serialized) enq_end(serialize_key);
3175 /* If the result is DEFER, or if a host retry record is known to exist, we
3176 need to add an item to the retry chain for updating the retry database
3177 at the end of delivery. We only need to add the item to the top address,
3178 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3179 for any other delivery attempts using the same address. (It is copied into
3180 the unusable tree at the outer level, so even if different address blocks
3181 contain the same address, it still won't get tried again.) */
3183 if (rc == DEFER || retry_host_key != NULL)
3185 int delete_flag = (rc != DEFER)? rf_delete : 0;
3186 if (retry_host_key == NULL)
3188 retry_host_key = ob->retry_include_ip_address?
3189 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3190 string_sprintf("T:%S%s", host->name, pistring);
3193 /* If a delivery of another message over an existing SMTP connection
3194 yields DEFER, we do NOT set up retry data for the host. This covers the
3195 case when there are delays in routing the addresses in the second message
3196 that are so long that the server times out. This is alleviated by not
3197 routing addresses that previously had routing defers when handling an
3198 existing connection, but even so, this case may occur (e.g. if a
3199 previously happily routed address starts giving routing defers). If the
3200 host is genuinely down, another non-continued message delivery will
3201 notice it soon enough. */
3203 if (delete_flag != 0 || !continuing)
3204 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3206 /* We may have tried an expired host, if its retry time has come; ensure
3207 the status reflects the expiry for the benefit of any other addresses. */
3211 host->status = (host_is_expired)?
3212 hstatus_unusable_expired : hstatus_unusable;
3213 host->why = hwhy_deferred;
3217 /* If message_defer is set (host was OK, but every recipient got deferred
3218 because of some message-specific problem), or if that had happened
3219 previously so that a message retry key exists, add an appropriate item
3220 to the retry chain. Note that if there was a message defer but now there is
3221 a host defer, the message defer record gets deleted. That seems perfectly
3222 reasonable. Also, stop the message from being remembered as waiting
3223 for specific hosts. */
3225 if (message_defer || retry_message_key != NULL)
3227 int delete_flag = message_defer? 0 : rf_delete;
3228 if (retry_message_key == NULL)
3230 retry_message_key = ob->retry_include_ip_address?
3231 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3233 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3235 retry_add_item(addrlist, retry_message_key,
3236 rf_message | rf_host | delete_flag);
3237 update_waiting = FALSE;
3240 /* Any return other than DEFER (that is, OK or ERROR) means that the
3241 addresses have got their final statuses filled in for this host. In the OK
3242 case, see if any of them are deferred. */
3246 for (addr = addrlist; addr != NULL; addr = addr->next)
3248 if (addr->transport_return == DEFER)
3250 some_deferred = TRUE;
3256 /* If no addresses deferred or the result was ERROR, return. We do this for
3257 ERROR because a failing filter set-up or add_headers expansion is likely to
3258 fail for any host we try. */
3260 if (rc == ERROR || (rc == OK && !some_deferred))
3262 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3263 return TRUE; /* Each address has its status */
3266 /* If the result was DEFER or some individual addresses deferred, let
3267 the loop run to try other hosts with the deferred addresses, except for the
3268 case when we were trying to deliver down an existing channel and failed.
3269 Don't try any other hosts in this case. */
3271 if (continuing) break;
3273 /* If the whole delivery, or some individual addresses, were deferred and
3274 there are more hosts that could be tried, do not count this host towards
3275 the hosts_max_try limit if the age of the message is greater than the
3276 maximum retry time for this host. This means we may try try all hosts,
3277 ignoring the limit, when messages have been around for some time. This is
3278 important because if we don't try all hosts, the address will never time
3279 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3281 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3284 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3286 if (retry != NULL && retry->rules != NULL)
3288 retry_rule *last_rule;
3289 for (last_rule = retry->rules;
3290 last_rule->next != NULL;
3291 last_rule = last_rule->next);
3292 timedout = time(NULL) - received_time > last_rule->timeout;
3294 else timedout = TRUE; /* No rule => timed out */
3298 unexpired_hosts_tried--;
3299 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3300 "hosts_max_try (message older than host's retry time)\n");
3303 } /* End of loop for trying multiple hosts. */
3305 /* This is the end of the loop that repeats iff expired is TRUE and
3306 ob->delay_after_cutoff is FALSE. The second time round we will
3307 try those hosts that haven't been tried since the message arrived. */
3311 debug_printf("all IP addresses skipped or deferred at least one address\n");
3312 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3313 debug_printf("retrying IP addresses not tried since message arrived\n");
3318 /* Get here if all IP addresses are skipped or defer at least one address. In
3319 MUA wrapper mode, this will happen only for connection or other non-message-
3320 specific failures. Force the delivery status for all addresses to FAIL. */
3324 for (addr = addrlist; addr != NULL; addr = addr->next)
3325 addr->transport_return = FAIL;
3329 /* In the normal, non-wrapper case, add a standard message to each deferred
3330 address if there hasn't been an error, that is, if it hasn't actually been
3331 tried this time. The variable "expired" will be FALSE if any deliveries were
3332 actually tried, or if there was at least one host that was not expired. That
3333 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3334 a delivery has been tried, an error code will be set, and the failing of the
3335 message is handled by the retry code later.
3337 If queue_smtp is set, or this transport was called to send a subsequent message
3338 down an existing TCP/IP connection, and something caused the host not to be
3339 found, we end up here, but can detect these cases and handle them specially. */
3341 for (addr = addrlist; addr != NULL; addr = addr->next)
3343 /* If host is not NULL, it means that we stopped processing the host list
3344 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3345 means we need to behave as if some hosts were skipped because their retry
3346 time had not come. Specifically, this prevents the address from timing out.
3347 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3348 hosts were tried. */
3352 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3355 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3356 "hosts were tried\n");
3361 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3362 setflag(addr, af_retry_skipped);
3366 if (queue_smtp) /* no deliveries attempted */
3368 addr->transport_return = DEFER;
3369 addr->basic_errno = 0;
3370 addr->message = US"SMTP delivery explicitly queued";
3373 else if (addr->transport_return == DEFER &&
3374 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3375 addr->message == NULL)
3377 addr->basic_errno = ERRNO_HRETRY;
3378 if (continue_hostname != NULL)
3380 addr->message = US"no host found for existing SMTP connection";
3384 setflag(addr, af_pass_message); /* This is not a security risk */
3385 addr->message = (ob->delay_after_cutoff)?
3386 US"retry time not reached for any host after a long failure period" :
3387 US"all hosts have been failing for a long time and were last tried "
3388 "after this message arrived";
3390 /* If we are already using fallback hosts, or there are no fallback hosts
3391 defined, convert the result to FAIL to cause a bounce. */
3393 if (addr->host_list == addr->fallback_hosts ||
3394 addr->fallback_hosts == NULL)
3395 addr->transport_return = FAIL;
3399 if (hosts_retry == hosts_total)
3400 addr->message = US"retry time not reached for any host";
3401 else if (hosts_fail == hosts_total)
3402 addr->message = US"all host address lookups failed permanently";
3403 else if (hosts_defer == hosts_total)
3404 addr->message = US"all host address lookups failed temporarily";
3405 else if (hosts_serial == hosts_total)
3406 addr->message = US"connection limit reached for all hosts";
3407 else if (hosts_fail+hosts_defer == hosts_total)
3408 addr->message = US"all host address lookups failed";
3409 else addr->message = US"some host address lookups failed and retry time "
3410 "not reached for other hosts or connection limit reached";
3415 /* Update the database which keeps information about which messages are waiting
3416 for which hosts to become available. For some message-specific errors, the
3417 update_waiting flag is turned off because we don't want follow-on deliveries in
3418 those cases. If this transport instance is explicitly limited to one message
3419 per connection then follow-on deliveries are not possible and there's no need
3420 to create/update the per-transport wait-<transport_name> database. */
3422 if (update_waiting && tblock->connection_max_messages != 1)
3423 transport_update_waiting(hostlist, tblock->name);
3427 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3429 return TRUE; /* Each address has its status */
3434 /* End of transport/smtp.c */
git://git.exim.org / users / heiko / exim.git / blob