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 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
108 # if defined EXPERIMENTAL_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 #ifdef EXPERIMENTAL_PRDR
118 { "hosts_try_prdr", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
122 { "hosts_verify_avoid_tls", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
125 { "interface", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, interface) },
127 { "keepalive", opt_bool,
128 (void *)offsetof(smtp_transport_options_block, keepalive) },
129 { "lmtp_ignore_quota", opt_bool,
130 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
131 { "max_rcpt", opt_int | opt_public,
132 (void *)offsetof(transport_instance, max_addresses) },
133 { "multi_domain", opt_bool | opt_public,
134 (void *)offsetof(transport_instance, multi_domain) },
135 { "port", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, port) },
137 { "protocol", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, protocol) },
139 { "retry_include_ip_address", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
141 { "serialize_hosts", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
143 { "size_addition", opt_int,
144 (void *)offsetof(smtp_transport_options_block, size_addition) }
146 ,{ "tls_certificate", opt_stringptr,
147 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
148 { "tls_crl", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_crl) },
150 { "tls_dh_min_bits", opt_int,
151 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
152 { "tls_privatekey", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
154 { "tls_require_ciphers", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
156 { "tls_sni", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_sni) },
158 { "tls_tempfail_tryclear", opt_bool,
159 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
160 { "tls_try_verify_hosts", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
162 { "tls_verify_certificates", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
164 { "tls_verify_hosts", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
167 #ifdef EXPERIMENTAL_TPDA
168 ,{ "tpda_host_defer_action", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
173 /* Size of the options list. An extern variable has to be used so that its
174 address can appear in the tables drtables.c. */
176 int smtp_transport_options_count =
177 sizeof(smtp_transport_options)/sizeof(optionlist);
179 /* Default private options block for the smtp transport. */
181 smtp_transport_options_block smtp_transport_option_defaults = {
183 NULL, /* fallback_hosts */
185 NULL, /* fallback_hostlist */
186 NULL, /* authenticated_sender */
187 US"$primary_hostname", /* helo_data */
188 NULL, /* interface */
190 US"smtp", /* protocol */
192 NULL, /* serialize_hosts */
193 NULL, /* hosts_try_auth */
194 NULL, /* hosts_require_auth */
195 #ifdef EXPERIMENTAL_PRDR
196 NULL, /* hosts_try_prdr */
198 #ifdef EXPERIMENTAL_OCSP
199 NULL, /* hosts_require_ocsp */
201 NULL, /* hosts_require_tls */
202 NULL, /* hosts_avoid_tls */
203 US"*", /* hosts_verify_avoid_tls */
204 NULL, /* hosts_avoid_pipelining */
205 NULL, /* hosts_avoid_esmtp */
206 NULL, /* hosts_nopass_tls */
207 5*60, /* command_timeout */
208 5*60, /* connect_timeout; shorter system default overrides */
209 5*60, /* data timeout */
210 10*60, /* final timeout */
211 1024, /* size_addition */
212 5, /* hosts_max_try */
213 50, /* hosts_max_try_hardlimit */
214 TRUE, /* address_retry_include_sender */
215 FALSE, /* allow_localhost */
216 FALSE, /* authenticated_sender_force */
217 FALSE, /* gethostbyname */
218 TRUE, /* dns_qualify_single */
219 FALSE, /* dns_search_parents */
220 NULL, /* dnssec_request_domains */
221 NULL, /* dnssec_require_domains */
222 TRUE, /* delay_after_cutoff */
223 FALSE, /* hosts_override */
224 FALSE, /* hosts_randomize */
225 TRUE, /* keepalive */
226 FALSE, /* lmtp_ignore_quota */
227 TRUE /* retry_include_ip_address */
229 ,NULL, /* tls_certificate */
231 NULL, /* tls_privatekey */
232 NULL, /* tls_require_ciphers */
233 NULL, /* gnutls_require_kx */
234 NULL, /* gnutls_require_mac */
235 NULL, /* gnutls_require_proto */
237 NULL, /* tls_verify_certificates */
238 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
239 /* tls_dh_min_bits */
240 TRUE, /* tls_tempfail_tryclear */
241 NULL, /* tls_verify_hosts */
242 NULL /* tls_try_verify_hosts */
245 ,NULL, /* dkim_canon */
246 NULL, /* dkim_domain */
247 NULL, /* dkim_private_key */
248 NULL, /* dkim_selector */
249 NULL, /* dkim_sign_headers */
250 NULL /* dkim_strict */
252 #ifdef EXPERIMENTAL_TPDA
253 ,NULL /* tpda_host_defer_action */
260 static uschar *smtp_command; /* Points to last cmd for error messages */
261 static uschar *mail_command; /* Points to MAIL cmd for error messages */
262 static BOOL update_waiting; /* TRUE to update the "wait" database */
265 /*************************************************
266 * Setup entry point *
267 *************************************************/
269 /* This function is called when the transport is about to be used,
270 but before running it in a sub-process. It is used for two things:
272 (1) To set the fallback host list in addresses, when delivering.
273 (2) To pass back the interface, port, protocol, and other options, for use
274 during callout verification.
277 tblock pointer to the transport instance block
278 addrlist list of addresses about to be transported
279 tf if not NULL, pointer to block in which to return options
280 uid the uid that will be set (not used)
281 gid the gid that will be set (not used)
282 errmsg place for error message (not used)
284 Returns: OK always (FAIL, DEFER not used)
288 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
289 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
291 smtp_transport_options_block *ob =
292 (smtp_transport_options_block *)(tblock->options_block);
294 errmsg = errmsg; /* Keep picky compilers happy */
298 /* Pass back options if required. This interface is getting very messy. */
302 tf->interface = ob->interface;
304 tf->protocol = ob->protocol;
305 tf->hosts = ob->hosts;
306 tf->hosts_override = ob->hosts_override;
307 tf->hosts_randomize = ob->hosts_randomize;
308 tf->gethostbyname = ob->gethostbyname;
309 tf->qualify_single = ob->dns_qualify_single;
310 tf->search_parents = ob->dns_search_parents;
311 tf->helo_data = ob->helo_data;
314 /* Set the fallback host list for all the addresses that don't have fallback
315 host lists, provided that the local host wasn't present in the original host
318 if (!testflag(addrlist, af_local_host_removed))
320 for (; addrlist != NULL; addrlist = addrlist->next)
321 if (addrlist->fallback_hosts == NULL)
322 addrlist->fallback_hosts = ob->fallback_hostlist;
330 /*************************************************
331 * Initialization entry point *
332 *************************************************/
334 /* Called for each instance, after its options have been read, to
335 enable consistency checks to be done, or anything else that needs
338 Argument: pointer to the transport instance block
343 smtp_transport_init(transport_instance *tblock)
345 smtp_transport_options_block *ob =
346 (smtp_transport_options_block *)(tblock->options_block);
348 /* Retry_use_local_part defaults FALSE if unset */
350 if (tblock->retry_use_local_part == TRUE_UNSET)
351 tblock->retry_use_local_part = FALSE;
353 /* Set the default port according to the protocol */
355 if (ob->port == NULL)
356 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
357 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
359 /* Set up the setup entry point, to be called before subprocesses for this
362 tblock->setup = smtp_transport_setup;
364 /* Complain if any of the timeouts are zero. */
366 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
367 ob->final_timeout <= 0)
368 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
369 "command, data, or final timeout value is zero for %s transport",
372 /* If hosts_override is set and there are local hosts, set the global
373 flag that stops verify from showing router hosts. */
375 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
377 /* If there are any fallback hosts listed, build a chain of host items
378 for them, but do not do any lookups at this time. */
380 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
387 /*************************************************
388 * Set delivery info into all active addresses *
389 *************************************************/
391 /* Only addresses whose status is >= PENDING are relevant. A lesser
392 status means that an address is not currently being processed.
395 addrlist points to a chain of addresses
396 errno_value to put in each address's errno field
397 msg to put in each address's message field
398 rc to put in each address's transport_return field
399 pass_message if TRUE, set the "pass message" flag in the address
401 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
402 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
403 this particular type of timeout.
409 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
414 if (errno_value == ERRNO_CONNECTTIMEOUT)
416 errno_value = ETIMEDOUT;
417 orvalue = RTEF_CTOUT;
419 for (addr = addrlist; addr != NULL; addr = addr->next)
421 if (addr->transport_return < PENDING) continue;
422 addr->basic_errno = errno_value;
423 addr->more_errno |= orvalue;
427 if (pass_message) setflag(addr, af_pass_message);
429 addr->transport_return = rc;
435 /*************************************************
436 * Check an SMTP response *
437 *************************************************/
439 /* This function is given an errno code and the SMTP response buffer
440 to analyse, together with the host identification for generating messages. It
441 sets an appropriate message and puts the first digit of the response code into
442 the yield variable. If no response was actually read, a suitable digit is
446 host the current host, to get its name for messages
447 errno_value pointer to the errno value
448 more_errno from the top address for use with ERRNO_FILTER_FAIL
449 buffer the SMTP response buffer
450 yield where to put a one-digit SMTP response code
451 message where to put an errror message
452 pass_message set TRUE if message is an SMTP response
454 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
457 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
458 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
462 if (smtp_use_pipelining &&
463 (Ustrcmp(smtp_command, "MAIL") == 0 ||
464 Ustrcmp(smtp_command, "RCPT") == 0 ||
465 Ustrcmp(smtp_command, "DATA") == 0))
468 *yield = '4'; /* Default setting is to give a temporary error */
470 /* Handle response timeout */
472 if (*errno_value == ETIMEDOUT)
474 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
475 "after %s%s", host->name, host->address, pl, smtp_command);
476 if (transport_count > 0)
477 *message = US string_sprintf("%s (%d bytes written)", *message,
482 /* Handle malformed SMTP response */
484 if (*errno_value == ERRNO_SMTPFORMAT)
486 uschar *malfresp = string_printing(buffer);
487 while (isspace(*malfresp)) malfresp++;
489 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
490 "%s [%s] in response to %s%s", host->name, host->address, pl,
493 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
494 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
498 /* Handle a failed filter process error; can't send QUIT as we mustn't
501 if (*errno_value == ERRNO_FILTER_FAIL)
503 *message = US string_sprintf("transport filter process failed (%d)%s",
505 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
509 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
512 if (*errno_value == ERRNO_CHHEADER_FAIL)
515 US string_sprintf("failed to expand headers_add or headers_remove: %s",
516 expand_string_message);
520 /* Handle failure to write a complete data block */
522 if (*errno_value == ERRNO_WRITEINCOMPLETE)
524 *message = US string_sprintf("failed to write a data block");
528 /* Handle error responses from the remote mailer. */
532 uschar *s = string_printing(buffer);
533 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
534 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
535 *pass_message = TRUE;
540 /* No data was read. If there is no errno, this must be the EOF (i.e.
541 connection closed) case, which causes deferral. An explicit connection reset
542 error has the same effect. Otherwise, put the host's identity in the message,
543 leaving the errno value to be interpreted as well. In all cases, we have to
544 assume the connection is now dead. */
546 if (*errno_value == 0 || *errno_value == ECONNRESET)
548 *errno_value = ERRNO_SMTPCLOSED;
549 *message = US string_sprintf("Remote host %s [%s] closed connection "
550 "in response to %s%s", host->name, host->address, pl, smtp_command);
552 else *message = US string_sprintf("%s [%s]", host->name, host->address);
559 /*************************************************
560 * Write error message to logs *
561 *************************************************/
563 /* This writes to the main log and to the message log.
566 addr the address item containing error information
567 host the current host
573 write_logs(address_item *addr, host_item *host)
575 if (addr->message != NULL)
577 uschar *message = addr->message;
578 if (addr->basic_errno > 0)
579 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
580 log_write(0, LOG_MAIN, "%s", message);
581 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
586 ((log_extra_selector & LX_outgoing_port) != 0)?
587 string_sprintf("%s [%s]:%d", host->name, host->address,
588 (host->port == PORT_NONE)? 25 : host->port)
590 string_sprintf("%s [%s]", host->name, host->address);
591 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
592 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
593 strerror(addr->basic_errno));
599 #ifdef EXPERIMENTAL_TPDA
600 /*************************************************
601 * Post-defer action *
602 *************************************************/
604 /* This expands an arbitrary per-transport string.
605 It might, for example, be used to write to the database log.
608 ob transport options block
609 addr the address item containing error information
610 host the current host
616 tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
618 uschar *action = ob->tpda_host_defer_action;
622 tpda_delivery_ip = string_copy(host->address);
623 tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
624 tpda_delivery_fqdn = string_copy(host->name);
625 tpda_delivery_local_part = string_copy(addr->local_part);
626 tpda_delivery_domain = string_copy(addr->domain);
627 tpda_defer_errno = addr->basic_errno;
629 tpda_defer_errstr = addr->message
630 ? addr->basic_errno > 0
631 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
632 : string_copy(addr->message)
633 : addr->basic_errno > 0
634 ? string_copy(strerror(addr->basic_errno))
638 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
639 action, tpda_delivery_ip);
641 router_name = addr->router->name;
642 transport_name = addr->transport->name;
643 if (!expand_string(action) && *expand_string_message)
644 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_defer_action in %s: %s\n",
645 transport_name, expand_string_message);
646 router_name = transport_name = NULL;
652 /*************************************************
653 * Synchronize SMTP responses *
654 *************************************************/
656 /* This function is called from smtp_deliver() to receive SMTP responses from
657 the server, and match them up with the commands to which they relate. When
658 PIPELINING is not in use, this function is called after every command, and is
659 therefore somewhat over-engineered, but it is simpler to use a single scheme
660 that works both with and without PIPELINING instead of having two separate sets
663 The set of commands that are buffered up with pipelining may start with MAIL
664 and may end with DATA; in between are RCPT commands that correspond to the
665 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
666 etc.) are never buffered.
668 Errors after MAIL or DATA abort the whole process leaving the response in the
669 buffer. After MAIL, pending responses are flushed, and the original command is
670 re-instated in big_buffer for error messages. For RCPT commands, the remote is
671 permitted to reject some recipient addresses while accepting others. However
672 certain errors clearly abort the whole process. Set the value in
673 transport_return to PENDING_OK if the address is accepted. If there is a
674 subsequent general error, it will get reset accordingly. If not, it will get
675 converted to OK at the end.
678 addrlist the complete address list
679 include_affixes TRUE if affixes include in RCPT
680 sync_addr ptr to the ptr of the one to start scanning at (updated)
681 host the host we are connected to
682 count the number of responses to read
684 include_sender true if 4xx retry is to include the sender it its key
685 pending_MAIL true if the first response is for MAIL
686 pending_DATA 0 if last command sent was not DATA
687 +1 if previously had a good recipient
688 -1 if not previously had a good recipient
689 inblock incoming SMTP block
690 timeout timeout value
691 buffer buffer for reading response
692 buffsize size of buffer
694 Returns: 3 if at least one address had 2xx and one had 5xx
695 2 if at least one address had 5xx but none had 2xx
696 1 if at least one host had a 2xx response, but none had 5xx
697 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
698 -1 timeout while reading RCPT response
699 -2 I/O or other non-response error for RCPT
700 -3 DATA or MAIL failed - errno and buffer set
704 sync_responses(address_item *addrlist, BOOL include_affixes,
705 address_item **sync_addr, host_item *host, int count,
706 BOOL address_retry_include_sender, BOOL pending_MAIL,
707 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
710 address_item *addr = *sync_addr;
713 /* Handle the response for a MAIL command. On error, reinstate the original
714 command in big_buffer for error message use, and flush any further pending
715 responses before returning, except after I/O errors and timeouts. */
720 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
722 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
723 if (errno == 0 && buffer[0] != 0)
725 uschar flushbuffer[4096];
727 if (buffer[0] == '4')
729 save_errno = ERRNO_MAIL4XX;
730 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
734 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
736 && (errno != 0 || flushbuffer[0] == 0))
745 if (pending_DATA) count--; /* Number of RCPT responses to come */
747 /* Read and handle the required number of RCPT responses, matching each one up
748 with an address by scanning for the next address whose status is PENDING_DEFER.
753 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
755 /* The address was accepted */
757 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
760 addr->transport_return = PENDING_OK;
762 /* If af_dr_retry_exists is set, there was a routing delay on this address;
763 ensure that any address-specific retry record is expunged. We do this both
764 for the basic key and for the version that also includes the sender. */
766 if (testflag(addr, af_dr_retry_exists))
768 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
770 retry_add_item(addr, altkey, rf_delete);
771 retry_add_item(addr, addr->address_retry_key, rf_delete);
775 /* Timeout while reading the response */
777 else if (errno == ETIMEDOUT)
779 int save_errno = errno;
780 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
781 "after RCPT TO:<%s>", host->name, host->address,
782 transport_rcpt_address(addr, include_affixes));
783 set_errno(addrlist, save_errno, message, DEFER, FALSE);
784 retry_add_item(addr, addr->address_retry_key, 0);
785 update_waiting = FALSE;
789 /* Handle other errors in obtaining an SMTP response by returning -1. This
790 will cause all the addresses to be deferred. Restore the SMTP command in
791 big_buffer for which we are checking the response, so the error message
794 else if (errno != 0 || buffer[0] == 0)
796 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
797 transport_rcpt_address(addr, include_affixes));
801 /* Handle SMTP permanent and temporary response codes. */
806 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
807 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
808 host->name, host->address, string_printing(buffer));
809 setflag(addr, af_pass_message);
810 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
812 /* The response was 5xx */
814 if (buffer[0] == '5')
816 addr->transport_return = FAIL;
820 /* The response was 4xx */
824 addr->transport_return = DEFER;
825 addr->basic_errno = ERRNO_RCPT4XX;
826 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
828 /* Log temporary errors if there are more hosts to be tried. */
830 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
832 /* Do not put this message on the list of those waiting for specific
833 hosts, as otherwise it is likely to be tried too often. */
835 update_waiting = FALSE;
837 /* Add a retry item for the address so that it doesn't get tried again
838 too soon. If address_retry_include_sender is true, add the sender address
841 if (address_retry_include_sender)
843 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
845 retry_add_item(addr, altkey, 0);
847 else retry_add_item(addr, addr->address_retry_key, 0);
850 } /* Loop for next RCPT response */
852 /* Update where to start at for the next block of responses, unless we
853 have already handled all the addresses. */
855 if (addr != NULL) *sync_addr = addr->next;
857 /* Handle a response to DATA. If we have not had any good recipients, either
858 previously or in this block, the response is ignored. */
860 if (pending_DATA != 0 &&
861 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
866 if (pending_DATA > 0 || (yield & 1) != 0)
868 if (errno == 0 && buffer[0] == '4')
870 errno = ERRNO_DATA4XX;
871 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
875 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
876 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
877 "is in use and there were no good recipients\n", msg);
880 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
881 present) received 3xx. If any RCPTs were handled and yielded anything other
882 than 4xx, yield will be set non-zero. */
889 /* Do the client side of smtp-level authentication */
892 buffer EHLO response from server (gets overwritten)
893 addrlist chain of potential addresses to deliver
894 host host to deliver to
896 ibp, obp comms channel control blocks
899 OK Success, or failed (but not required): global "smtp_authenticated" set
900 DEFER Failed authentication (and was required)
901 ERROR Internal problem
903 FAIL_SEND Failed communications - transmit
908 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
909 smtp_transport_options_block *ob, BOOL is_esmtp,
910 smtp_inblock *ibp, smtp_outblock *obp)
913 uschar *fail_reason = US"server did not advertise AUTH support";
915 smtp_authenticated = FALSE;
916 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
917 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
918 host->name, host->address, NULL);
920 if (is_esmtp && !regex_AUTH) regex_AUTH =
921 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
924 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
926 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
927 expand_nmax = -1; /* reset */
929 /* Must not do this check until after we have saved the result of the
930 regex match above. */
932 if (require_auth == OK ||
933 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
934 host->address, NULL) == OK)
937 fail_reason = US"no common mechanisms were found";
939 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
941 /* Scan the configured authenticators looking for one which is configured
942 for use as a client, which is not suppressed by client_condition, and
943 whose name matches an authentication mechanism supported by the server.
944 If one is found, attempt to authenticate by calling its client function.
947 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
951 (au->client_condition != NULL &&
952 !expand_check_condition(au->client_condition, au->name,
953 US"client authenticator")))
955 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
957 (au->client)? "client_condition is false" :
958 "not configured as a client");
962 /* Loop to scan supported server mechanisms */
967 int len = Ustrlen(au->public_name);
968 while (isspace(*p)) p++;
970 if (strncmpic(au->public_name, p, len) != 0 ||
971 (p[len] != 0 && !isspace(p[len])))
973 while (*p != 0 && !isspace(*p)) p++;
977 /* Found data for a listed mechanism. Call its client entry. Set
978 a flag in the outblock so that data is overwritten after sending so
979 that reflections don't show it. */
981 fail_reason = US"authentication attempt(s) failed";
982 obp->authenticating = TRUE;
983 rc = (au->info->clientcode)(au, ibp, obp,
984 ob->command_timeout, buffer, bufsize);
985 obp->authenticating = FALSE;
986 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
989 /* A temporary authentication failure must hold up delivery to
990 this host. After a permanent authentication failure, we carry on
991 to try other authentication methods. If all fail hard, try to
992 deliver the message unauthenticated unless require_auth was set. */
997 smtp_authenticated = TRUE; /* stops the outer loop */
998 client_authenticator = au->name;
999 if (au->set_client_id != NULL)
1000 client_authenticated_id = expand_string(au->set_client_id);
1003 /* Failure after writing a command */
1008 /* Failure after reading a response */
1011 if (errno != 0 || buffer[0] != '5') return FAIL;
1012 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1013 au->name, host->name, host->address, buffer);
1016 /* Failure by some other means. In effect, the authenticator
1017 decided it wasn't prepared to handle this case. Typically this
1018 is the result of "fail" in an expansion string. Do we need to
1019 log anything here? Feb 2006: a message is now put in the buffer
1020 if logging is required. */
1024 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1025 "authentication H=%s [%s] %s", au->name, host->name,
1026 host->address, buffer);
1029 /* Internal problem, message in buffer. */
1032 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1036 break; /* If not authenticated, try next authenticator */
1037 } /* Loop for scanning supported server mechanisms */
1038 } /* Loop for further authenticators */
1042 /* If we haven't authenticated, but are required to, give up. */
1044 if (require_auth == OK && !smtp_authenticated)
1046 set_errno(addrlist, ERRNO_AUTHFAIL,
1047 string_sprintf("authentication required but %s", fail_reason), DEFER,
1056 /* Construct AUTH appendix string for MAIL TO */
1059 buffer to build string
1060 addrlist chain of potential addresses to deliver
1061 ob transport options
1063 Globals smtp_authenticated
1064 client_authenticated_sender
1065 Return True on error, otherwise buffer has (possibly empty) terminated string
1069 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1070 smtp_transport_options_block *ob)
1072 uschar *local_authenticated_sender = authenticated_sender;
1075 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1078 if (ob->authenticated_sender != NULL)
1080 uschar *new = expand_string(ob->authenticated_sender);
1083 if (!expand_string_forcedfail)
1085 uschar *message = string_sprintf("failed to expand "
1086 "authenticated_sender: %s", expand_string_message);
1087 set_errno(addrlist, 0, message, DEFER, FALSE);
1091 else if (new[0] != 0) local_authenticated_sender = new;
1094 /* Add the authenticated sender address if present */
1096 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1097 local_authenticated_sender != NULL)
1099 string_format(buffer, bufsize, " AUTH=%s",
1100 auth_xtextencode(local_authenticated_sender,
1101 Ustrlen(local_authenticated_sender)));
1102 client_authenticated_sender = string_copy(local_authenticated_sender);
1112 /*************************************************
1113 * Deliver address list to given host *
1114 *************************************************/
1116 /* If continue_hostname is not null, we get here only when continuing to
1117 deliver down an existing channel. The channel was passed as the standard
1118 input. TLS is never active on a passed channel; the previous process always
1119 closes it down before passing the connection on.
1121 Otherwise, we have to make a connection to the remote host, and do the
1122 initial protocol exchange.
1124 When running as an MUA wrapper, if the sender or any recipient is rejected,
1125 temporarily or permanently, we force failure for all recipients.
1128 addrlist chain of potential addresses to deliver; only those whose
1129 transport_return field is set to PENDING_DEFER are currently
1130 being processed; others should be skipped - they have either
1131 been delivered to an earlier host or IP address, or been
1132 failed by one of them.
1133 host host to deliver to
1134 host_af AF_INET or AF_INET6
1135 port default TCP/IP port to use, in host byte order
1136 interface interface to bind to, or NULL
1137 tblock transport instance block
1138 copy_host TRUE if host set in addr->host_used must be copied, because
1139 it is specific to this call of the transport
1140 message_defer set TRUE if yield is OK, but all addresses were deferred
1141 because of a non-recipient, non-host failure, that is, a
1142 4xx response to MAIL FROM, DATA, or ".". This is a defer
1143 that is specific to the message.
1144 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1145 a second attempt after TLS initialization fails
1147 Returns: OK - the connection was made and the delivery attempted;
1148 the result for each address is in its data block.
1149 DEFER - the connection could not be made, or something failed
1150 while setting up the SMTP session, or there was a
1151 non-message-specific error, such as a timeout.
1152 ERROR - a filter command is specified for this transport,
1153 and there was a problem setting it up; OR helo_data
1154 or add_headers or authenticated_sender is specified
1155 for this transport, and the string failed to expand
1159 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1160 uschar *interface, transport_instance *tblock, BOOL copy_host,
1161 BOOL *message_defer, BOOL suppress_tls)
1164 address_item *sync_addr;
1165 address_item *first_addr = addrlist;
1170 time_t start_delivery_time = time(NULL);
1171 smtp_transport_options_block *ob =
1172 (smtp_transport_options_block *)(tblock->options_block);
1173 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1174 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1176 BOOL send_rset = TRUE;
1177 BOOL send_quit = TRUE;
1178 BOOL setting_up = TRUE;
1179 BOOL completed_address = FALSE;
1182 BOOL pass_message = FALSE;
1183 #ifdef EXPERIMENTAL_PRDR
1184 BOOL prdr_offered = FALSE;
1187 smtp_inblock inblock;
1188 smtp_outblock outblock;
1189 int max_rcpt = tblock->max_addresses;
1190 uschar *igquotstr = US"";
1191 uschar *helo_data = NULL;
1192 uschar *message = NULL;
1193 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1195 uschar buffer[4096];
1196 uschar inbuffer[4096];
1197 uschar outbuffer[1024];
1199 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1201 *message_defer = FALSE;
1202 smtp_command = US"initial connection";
1203 if (max_rcpt == 0) max_rcpt = 999999;
1205 /* Set up the buffer for reading SMTP response packets. */
1207 inblock.buffer = inbuffer;
1208 inblock.buffersize = sizeof(inbuffer);
1209 inblock.ptr = inbuffer;
1210 inblock.ptrend = inbuffer;
1212 /* Set up the buffer for holding SMTP commands while pipelining */
1214 outblock.buffer = outbuffer;
1215 outblock.buffersize = sizeof(outbuffer);
1216 outblock.ptr = outbuffer;
1217 outblock.cmd_count = 0;
1218 outblock.authenticating = FALSE;
1220 /* Reset the parameters of a TLS session. */
1223 tls_out.cipher = NULL; /* the one we may use for this transport */
1224 tls_out.ourcert = NULL;
1225 tls_out.peercert = NULL;
1226 tls_out.peerdn = NULL;
1227 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1231 /* Flip the legacy TLS-related variables over to the outbound set in case
1232 they're used in the context of the transport. Don't bother resetting
1233 afterward as we're in a subprocess. */
1235 tls_modify_variables(&tls_out);
1240 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1245 /* Make a connection to the host if this isn't a continued delivery, and handle
1246 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1247 specially so they can be identified for retries. */
1249 if (continue_hostname == NULL)
1251 inblock.sock = outblock.sock =
1252 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1253 ob->keepalive, ob->dscp); /* This puts port into host->port */
1255 if (inblock.sock < 0)
1257 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1258 NULL, DEFER, FALSE);
1262 /* Expand the greeting message while waiting for the initial response. (Makes
1263 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1264 delayed till here so that $sending_interface and $sending_port are set. */
1266 helo_data = expand_string(ob->helo_data);
1268 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1269 is nevertheless a reasonably clean way of programming this kind of logic,
1270 where you want to escape on any error. */
1274 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1275 ob->command_timeout)) goto RESPONSE_FAILED;
1277 /* Now check if the helo_data expansion went well, and sign off cleanly if
1280 if (helo_data == NULL)
1282 uschar *message = string_sprintf("failed to expand helo_data: %s",
1283 expand_string_message);
1284 set_errno(addrlist, 0, message, DEFER, FALSE);
1290 /** Debugging without sending a message
1291 addrlist->transport_return = DEFER;
1295 /* Errors that occur after this point follow an SMTP command, which is
1296 left in big_buffer by smtp_write_command() for use in error messages. */
1298 smtp_command = big_buffer;
1300 /* Tell the remote who we are...
1302 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1303 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1304 greeting is of this form. The assumption was that the far end supports it
1305 properly... but experience shows that there are some that give 5xx responses,
1306 even though the banner includes "ESMTP" (there's a bloody-minded one that
1307 says "ESMTP not spoken here"). Cope with that case.
1309 September 2000: Time has passed, and it seems reasonable now to always send
1310 EHLO at the start. It is also convenient to make the change while installing
1313 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1314 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1315 would be no way to send out the mails, so there is now a host list
1316 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1317 PIPELINING problem as well. Maybe it can also be useful to cure other
1318 problems with broken servers.
1320 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1321 Then somebody tried it with a Microsoft mailer... It seems that all other
1322 mailers use upper case for some reason (the RFC is quite clear about case
1323 independence) so, for peace of mind, I gave in. */
1325 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1326 host->name, host->address, NULL) != OK;
1328 /* Alas; be careful, since this goto is not an error-out, so conceivably
1329 we might set data between here and the target which we assume to exist
1330 and be usable. I can see this coming back to bite us. */
1335 suppress_tls = FALSE;
1336 ob->tls_tempfail_tryclear = FALSE;
1337 smtp_command = US"SSL-on-connect";
1344 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1345 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1347 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1348 ob->command_timeout))
1350 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1357 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1362 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1364 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1365 ob->command_timeout)) goto RESPONSE_FAILED;
1368 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1369 lmtp_ignore_quota option was set. */
1371 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1372 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1373 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1375 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1378 tls_offered = esmtp &&
1379 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1380 PCRE_EOPT, NULL, 0) >= 0;
1383 #ifdef EXPERIMENTAL_PRDR
1384 prdr_offered = esmtp &&
1385 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1386 PCRE_EOPT, NULL, 0) >= 0) &&
1387 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1388 host->address, NULL) == OK);
1391 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1395 /* For continuing deliveries down the same channel, the socket is the standard
1396 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1397 below). Set up the pointer to where subsequent commands will be left, for
1398 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1399 set from the command line if they were set in the process that passed the
1404 inblock.sock = outblock.sock = fileno(stdin);
1405 smtp_command = big_buffer;
1406 host->port = port; /* Record the port that was used */
1409 /* If TLS is available on this connection, whether continued or not, attempt to
1410 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1411 send another EHLO - the server may give a different answer in secure mode. We
1412 use a separate buffer for reading the response to STARTTLS so that if it is
1413 negative, the original EHLO data is available for subsequent analysis, should
1414 the client not be required to use TLS. If the response is bad, copy the buffer
1415 for error analysis. */
1418 if (tls_offered && !suppress_tls &&
1419 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1420 host->address, NULL) != OK)
1422 uschar buffer2[4096];
1423 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1426 /* If there is an I/O error, transmission of this message is deferred. If
1427 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1428 false, we also defer. However, if there is a temporary rejection of STARTTLS
1429 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1430 STARTTLS, we carry on. This means we will try to send the message in clear,
1431 unless the host is in hosts_require_tls (tested below). */
1433 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1434 ob->command_timeout))
1436 if (errno != 0 || buffer2[0] == 0 ||
1437 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1439 Ustrncpy(buffer, buffer2, sizeof(buffer));
1440 goto RESPONSE_FAILED;
1444 /* STARTTLS accepted: try to negotiate a TLS session. */
1449 int rc = tls_client_start(inblock.sock, host, addrlist, ob);
1451 /* TLS negotiation failed; give an error. From outside, this function may
1452 be called again to try in clear on a new connection, if the options permit
1453 it for this host. */
1457 save_errno = ERRNO_TLSFAILURE;
1458 message = US"failure while setting up TLS session";
1463 /* TLS session is set up */
1465 for (addr = addrlist; addr != NULL; addr = addr->next)
1467 if (addr->transport_return == PENDING_DEFER)
1469 addr->cipher = tls_out.cipher;
1470 addr->ourcert = tls_out.ourcert;
1471 addr->peercert = tls_out.peercert;
1472 addr->peerdn = tls_out.peerdn;
1478 /* if smtps, we'll have smtp_command set to something else; always safe to
1480 smtp_command = big_buffer;
1482 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1483 helo_data is null, we are dealing with a connection that was passed from
1484 another process, and so we won't have expanded helo_data above. We have to
1485 expand it here. $sending_ip_address and $sending_port are set up right at the
1486 start of the Exim process (in exim.c). */
1488 if (tls_out.active >= 0)
1491 if (helo_data == NULL)
1493 helo_data = expand_string(ob->helo_data);
1494 if (helo_data == NULL)
1496 uschar *message = string_sprintf("failed to expand helo_data: %s",
1497 expand_string_message);
1498 set_errno(addrlist, 0, message, DEFER, FALSE);
1504 /* For SMTPS we need to wait for the initial OK response. */
1507 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1508 ob->command_timeout)) goto RESPONSE_FAILED;
1512 greeting_cmd = "EHLO";
1515 greeting_cmd = "HELO";
1517 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1520 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1521 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1523 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1524 ob->command_timeout))
1525 goto RESPONSE_FAILED;
1528 /* If the host is required to use a secure channel, ensure that we
1531 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1532 host->address, NULL) == OK)
1534 save_errno = ERRNO_TLSREQUIRED;
1535 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1536 host->name, host->address,
1537 tls_offered? "an attempt to start TLS failed" :
1538 "the server did not offer TLS support");
1543 /* If TLS is active, we have just started it up and re-done the EHLO command,
1544 so its response needs to be analyzed. If TLS is not active and this is a
1545 continued session down a previously-used socket, we haven't just done EHLO, so
1548 if (continue_hostname == NULL
1550 || tls_out.active >= 0
1554 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1555 lmtp_ignore_quota option was set. */
1557 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1558 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1559 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1561 /* If the response to EHLO specified support for the SIZE parameter, note
1562 this, provided size_addition is non-negative. */
1564 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1565 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1566 PCRE_EOPT, NULL, 0) >= 0;
1568 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1569 the current host, esmtp will be false, so PIPELINING can never be used. If
1570 the current host matches hosts_avoid_pipelining, don't do it. */
1572 smtp_use_pipelining = esmtp &&
1573 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1574 host->address, NULL) != OK &&
1575 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1576 PCRE_EOPT, NULL, 0) >= 0;
1578 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1579 smtp_use_pipelining? "" : "not ");
1581 #ifdef EXPERIMENTAL_PRDR
1582 prdr_offered = esmtp &&
1583 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1584 PCRE_EOPT, NULL, 0) >= 0 &&
1585 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1586 host->address, NULL) == OK;
1589 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1592 /* Note if the response to EHLO specifies support for the AUTH extension.
1593 If it has, check that this host is one we want to authenticate to, and do
1594 the business. The host name and address must be available when the
1595 authenticator's client driver is running. */
1597 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1598 ob, esmtp, &inblock, &outblock))
1600 default: goto SEND_QUIT;
1602 case FAIL_SEND: goto SEND_FAILED;
1603 case FAIL: goto RESPONSE_FAILED;
1607 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1608 message-specific. */
1612 /* If there is a filter command specified for this transport, we can now
1613 set it up. This cannot be done until the identify of the host is known. */
1615 if (tblock->filter_command != NULL)
1619 sprintf(CS buffer, "%.50s transport", tblock->name);
1620 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1621 TRUE, DEFER, addrlist, buffer, NULL);
1622 transport_filter_timeout = tblock->filter_timeout;
1624 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1629 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1637 /* For messages that have more than the maximum number of envelope recipients,
1638 we want to send several transactions down the same SMTP connection. (See
1639 comments in deliver.c as to how this reconciles, heuristically, with
1640 remote_max_parallel.) This optimization was added to Exim after the following
1641 code was already working. The simplest way to put it in without disturbing the
1642 code was to use a goto to jump back to this point when there is another
1643 transaction to handle. */
1646 sync_addr = first_addr;
1650 completed_address = FALSE;
1653 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1654 qualification, send it, adding something to the message size to allow for
1655 imprecision and things that get added en route. Exim keeps the number of lines
1656 in a message, so we can give an accurate value for the original message, but we
1657 need some additional to handle added headers. (Double "." characters don't get
1658 included in the count.) */
1665 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1669 #ifdef EXPERIMENTAL_PRDR
1670 prdr_active = FALSE;
1673 for (addr = first_addr; addr; addr = addr->next)
1674 if (addr->transport_return == PENDING_DEFER)
1676 for (addr = addr->next; addr; addr = addr->next)
1677 if (addr->transport_return == PENDING_DEFER)
1678 { /* at least two recipients to send */
1680 sprintf(CS p, " PRDR"); p += 5;
1681 goto prdr_is_active;
1689 /* If an authenticated_sender override has been specified for this transport
1690 instance, expand it. If the expansion is forced to fail, and there was already
1691 an authenticated_sender for this message, the original value will be used.
1692 Other expansion failures are serious. An empty result is ignored, but there is
1693 otherwise no check - this feature is expected to be used with LMTP and other
1694 cases where non-standard addresses (e.g. without domains) might be required. */
1696 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1699 /* From here until we send the DATA command, we can make use of PIPELINING
1700 if the server host supports it. The code has to be able to check the responses
1701 at any point, for when the buffer fills up, so we write it totally generally.
1702 When PIPELINING is off, each command written reports that it has flushed the
1705 pending_MAIL = TRUE; /* The block starts with MAIL */
1707 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1708 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1709 mail_command = string_copy(big_buffer); /* Save for later error message */
1713 case -1: /* Transmission error */
1716 case +1: /* Block was sent */
1717 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1718 ob->command_timeout))
1720 if (errno == 0 && buffer[0] == '4')
1722 errno = ERRNO_MAIL4XX;
1723 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1725 goto RESPONSE_FAILED;
1727 pending_MAIL = FALSE;
1731 /* Pass over all the relevant recipient addresses for this host, which are the
1732 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1733 several before we have to read the responses for those seen so far. This
1734 checking is done by a subroutine because it also needs to be done at the end.
1735 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1736 the next one if not all are sent.
1738 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1739 last address because we want to abort if any recipients have any kind of
1740 problem, temporary or permanent. We know that all recipient addresses will have
1741 the PENDING_DEFER status, because only one attempt is ever made, and we know
1742 that max_rcpt will be large, so all addresses will be done at once. */
1744 for (addr = first_addr;
1745 address_count < max_rcpt && addr != NULL;
1751 if (addr->transport_return != PENDING_DEFER) continue;
1754 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1756 /* Now send the RCPT command, and process outstanding responses when
1757 necessary. After a timeout on RCPT, we just end the function, leaving the
1758 yield as OK, because this error can often mean that there is a problem with
1759 just one address, so we don't want to delay the host. */
1761 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1762 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1763 if (count < 0) goto SEND_FAILED;
1766 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1767 &sync_addr, host, count, ob->address_retry_include_sender,
1768 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1771 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1772 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1775 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1776 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1777 case 0: /* No 2xx or 5xx, but no probs */
1780 case -1: goto END_OFF; /* Timeout on RCPT */
1781 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1783 pending_MAIL = FALSE; /* Dealt with MAIL */
1785 } /* Loop for next address */
1787 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1788 permanently or temporarily. We should have flushed and synced after the last
1793 address_item *badaddr;
1794 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1796 if (badaddr->transport_return != PENDING_OK) break;
1798 if (badaddr != NULL)
1800 set_errno(addrlist, 0, badaddr->message, FAIL,
1801 testflag(badaddr, af_pass_message));
1806 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1807 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1808 have a good recipient buffered up if we are pipelining. We don't want to waste
1809 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1810 are pipelining. The responses are all handled by sync_responses(). */
1812 if (ok || (smtp_use_pipelining && !mua_wrapper))
1814 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1815 if (count < 0) goto SEND_FAILED;
1816 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1817 host, count, ob->address_retry_include_sender, pending_MAIL,
1818 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1820 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1821 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1824 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1825 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1826 case 0: break; /* No 2xx or 5xx, but no probs */
1828 case -1: goto END_OFF; /* Timeout on RCPT */
1829 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1833 /* Save the first address of the next batch. */
1837 /* If there were no good recipients (but otherwise there have been no
1838 problems), just set ok TRUE, since we have handled address-specific errors
1839 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1840 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1841 well as body. Set the appropriate timeout value to be used for each chunk.
1842 (Haven't been able to make it work using select() for writing yet.) */
1844 if (!ok) ok = TRUE; else
1846 sigalrm_seen = FALSE;
1847 transport_write_timeout = ob->data_timeout;
1848 smtp_command = US"sending data block"; /* For error messages */
1849 DEBUG(D_transport|D_v)
1850 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1851 transport_count = 0;
1852 #ifndef DISABLE_DKIM
1853 ok = dkim_transport_write_message(addrlist, inblock.sock,
1854 topt_use_crlf | topt_end_dot | topt_escape_headers |
1855 (tblock->body_only? topt_no_headers : 0) |
1856 (tblock->headers_only? topt_no_body : 0) |
1857 (tblock->return_path_add? topt_add_return_path : 0) |
1858 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1859 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1860 0, /* No size limit */
1861 tblock->add_headers, tblock->remove_headers,
1862 US".", US"..", /* Escaping strings */
1863 tblock->rewrite_rules, tblock->rewrite_existflags,
1864 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1865 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1868 ok = transport_write_message(addrlist, inblock.sock,
1869 topt_use_crlf | topt_end_dot | topt_escape_headers |
1870 (tblock->body_only? topt_no_headers : 0) |
1871 (tblock->headers_only? topt_no_body : 0) |
1872 (tblock->return_path_add? topt_add_return_path : 0) |
1873 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1874 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1875 0, /* No size limit */
1876 tblock->add_headers, tblock->remove_headers,
1877 US".", US"..", /* Escaping strings */
1878 tblock->rewrite_rules, tblock->rewrite_existflags);
1881 /* transport_write_message() uses write() because it is called from other
1882 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1883 it can exit with "Broken pipe" as its error. This really means that the
1884 socket got closed at the far end. */
1886 transport_write_timeout = 0; /* for subsequent transports */
1888 /* Failure can either be some kind of I/O disaster (including timeout),
1889 or the failure of a transport filter or the expansion of added headers. */
1893 buffer[0] = 0; /* There hasn't been a response */
1894 goto RESPONSE_FAILED;
1897 /* We used to send the terminating "." explicitly here, but because of
1898 buffering effects at both ends of TCP/IP connections, you don't gain
1899 anything by keeping it separate, so it might as well go in the final
1900 data buffer for efficiency. This is now done by setting the topt_end_dot
1903 smtp_command = US"end of data";
1905 #ifdef EXPERIMENTAL_PRDR
1906 /* For PRDR we optionally get a partial-responses warning
1907 * followed by the individual responses, before going on with
1908 * the overall response. If we don't get the warning then deal
1909 * with per non-PRDR. */
1912 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1914 if (!ok && errno == 0)
1917 case '2': prdr_active = FALSE;
1920 case '4': errno = ERRNO_DATA4XX;
1921 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1928 /* For non-PRDR SMTP, we now read a single response that applies to the
1929 whole message. If it is OK, then all the addresses have been delivered. */
1933 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1935 if (!ok && errno == 0 && buffer[0] == '4')
1937 errno = ERRNO_DATA4XX;
1938 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1942 /* For LMTP, we get back a response for every RCPT command that we sent;
1943 some may be accepted and some rejected. For those that get a response, their
1944 status is fixed; any that are accepted have been handed over, even if later
1945 responses crash - at least, that's how I read RFC 2033.
1947 If all went well, mark the recipient addresses as completed, record which
1948 host/IPaddress they were delivered to, and cut out RSET when sending another
1949 message down the same channel. Write the completed addresses to the journal
1950 now so that they are recorded in case there is a crash of hardware or
1951 software before the spool gets updated. Also record the final SMTP
1952 confirmation if needed (for SMTP only). */
1957 int delivery_time = (int)(time(NULL) - start_delivery_time);
1960 uschar *conf = NULL;
1963 /* Make a copy of the host if it is local to this invocation
1964 of the transport. */
1968 thost = store_get(sizeof(host_item));
1970 thost->name = string_copy(host->name);
1971 thost->address = string_copy(host->address);
1975 /* Set up confirmation if needed - applies only to SMTP */
1978 #ifndef EXPERIMENTAL_TPDA
1979 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1984 uschar *s = string_printing(buffer);
1985 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1988 /* Process all transported addresses - for LMTP or PRDR, read a status for
1991 for (addr = addrlist; addr != first_addr; addr = addr->next)
1993 if (addr->transport_return != PENDING_OK) continue;
1995 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1996 remaining addresses. Otherwise, it's a return code for just the one
1997 address. For temporary errors, add a retry item for the address so that
1998 it doesn't get tried again too soon. */
2000 #ifdef EXPERIMENTAL_PRDR
2001 if (lmtp || prdr_active)
2006 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2009 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2010 addr->message = string_sprintf(
2011 #ifdef EXPERIMENTAL_PRDR
2012 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2014 "LMTP error after %s: %s",
2016 big_buffer, string_printing(buffer));
2017 setflag(addr, af_pass_message); /* Allow message to go to user */
2018 if (buffer[0] == '5')
2019 addr->transport_return = FAIL;
2022 errno = ERRNO_DATA4XX;
2023 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2024 addr->transport_return = DEFER;
2025 #ifdef EXPERIMENTAL_PRDR
2028 retry_add_item(addr, addr->address_retry_key, 0);
2032 completed_address = TRUE; /* NOW we can set this flag */
2033 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2035 uschar *s = string_printing(buffer);
2036 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2040 /* SMTP, or success return from LMTP for this address. Pass back the
2041 actual host that was used. */
2043 addr->transport_return = OK;
2044 addr->more_errno = delivery_time;
2045 addr->host_used = thost;
2046 addr->special_action = flag;
2047 addr->message = conf;
2048 #ifdef EXPERIMENTAL_PRDR
2049 if (prdr_active) addr->flags |= af_prdr_used;
2053 #ifdef EXPERIMENTAL_PRDR
2057 /* Update the journal. For homonymic addresses, use the base address plus
2058 the transport name. See lots of comments in deliver.c about the reasons
2059 for the complications when homonyms are involved. Just carry on after
2060 write error, as it may prove possible to update the spool file later. */
2062 if (testflag(addr, af_homonym))
2063 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2065 sprintf(CS buffer, "%.500s\n", addr->unique);
2067 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2068 len = Ustrlen(CS buffer);
2069 if (write(journal_fd, buffer, len) != len)
2070 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2071 "%s: %s", buffer, strerror(errno));
2075 #ifdef EXPERIMENTAL_PRDR
2078 /* PRDR - get the final, overall response. For any non-success
2079 upgrade all the address statuses. */
2080 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2084 if(errno == 0 && buffer[0] == '4')
2086 errno = ERRNO_DATA4XX;
2087 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2089 for (addr = addrlist; addr != first_addr; addr = addr->next)
2090 if (buffer[0] == '5' || addr->transport_return == OK)
2091 addr->transport_return = PENDING_OK; /* allow set_errno action */
2092 goto RESPONSE_FAILED;
2095 /* Update the journal, or setup retry. */
2096 for (addr = addrlist; addr != first_addr; addr = addr->next)
2097 if (addr->transport_return == OK)
2099 if (testflag(addr, af_homonym))
2100 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2102 sprintf(CS buffer, "%.500s\n", addr->unique);
2104 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2105 len = Ustrlen(CS buffer);
2106 if (write(journal_fd, buffer, len) != len)
2107 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2108 "%s: %s", buffer, strerror(errno));
2110 else if (addr->transport_return == DEFER)
2111 retry_add_item(addr, addr->address_retry_key, -2);
2115 /* Ensure the journal file is pushed out to disk. */
2117 if (EXIMfsync(journal_fd) < 0)
2118 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2124 /* Handle general (not specific to one address) failures here. The value of ok
2125 is used to skip over this code on the falling through case. A timeout causes a
2126 deferral. Other errors may defer or fail according to the response code, and
2127 may set up a special errno value, e.g. after connection chopped, which is
2128 assumed if errno == 0 and there is no text in the buffer. If control reaches
2129 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2130 the problem is not related to this specific message. */
2139 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2140 buffer, &code, &message, &pass_message);
2146 message = US string_sprintf("send() to %s [%s] failed: %s",
2147 host->name, host->address, strerror(save_errno));
2151 /* This label is jumped to directly when a TLS negotiation has failed,
2152 or was not done for a host for which it is required. Values will be set
2153 in message and save_errno, and setting_up will always be true. Treat as
2154 a temporary error. */
2161 /* If the failure happened while setting up the call, see if the failure was
2162 a 5xx response (this will either be on connection, or following HELO - a 5xx
2163 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2164 never going to accept them. For other errors during setting up (timeouts or
2165 whatever), defer all addresses, and yield DEFER, so that the host is not
2166 tried again for a while. */
2169 ok = FALSE; /* For when reached by GOTO */
2175 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2179 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2184 /* We want to handle timeouts after MAIL or "." and loss of connection after
2185 "." specially. They can indicate a problem with the sender address or with
2186 the contents of the message rather than a real error on the connection. These
2187 cases are treated in the same way as a 4xx response. This next bit of code
2188 does the classification. */
2199 message_error = TRUE;
2203 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2204 Ustrncmp(smtp_command,"end ",4) == 0;
2207 case ERRNO_SMTPCLOSED:
2208 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2212 message_error = FALSE;
2216 /* Handle the cases that are treated as message errors. These are:
2218 (a) negative response or timeout after MAIL
2219 (b) negative response after DATA
2220 (c) negative response or timeout or dropped connection after "."
2222 It won't be a negative response or timeout after RCPT, as that is dealt
2223 with separately above. The action in all cases is to set an appropriate
2224 error code for all the addresses, but to leave yield set to OK because the
2225 host itself has not failed. Of course, it might in practice have failed
2226 when we've had a timeout, but if so, we'll discover that at the next
2227 delivery attempt. For a temporary error, set the message_defer flag, and
2228 write to the logs for information if this is not the last host. The error
2229 for the last host will be logged as part of the address's log line. */
2233 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2234 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2237 /* If there's an errno, the message contains just the identity of
2240 if (code != '5') /* Anything other than 5 is treated as temporary */
2243 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2244 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2245 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2246 *message_defer = TRUE;
2250 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2251 ".", or some other transportation error. We defer all addresses and yield
2252 DEFER, except for the case of failed add_headers expansion, or a transport
2253 filter failure, when the yield should be ERROR, to stop it trying other
2258 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2259 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2260 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2266 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2267 SMTP session tidily. However, if there were too many addresses to send in one
2268 message (indicated by first_addr being non-NULL) we want to carry on with the
2269 rest of them. Also, it is desirable to send more than one message down the SMTP
2270 connection if there are several waiting, provided we haven't already sent so
2271 many as to hit the configured limit. The function transport_check_waiting looks
2272 for a waiting message and returns its id. Then transport_pass_socket tries to
2273 set up a continued delivery by passing the socket on to another process. The
2274 variable send_rset is FALSE if a message has just been successfully transfered.
2276 If we are already sending down a continued channel, there may be further
2277 addresses not yet delivered that are aimed at the same host, but which have not
2278 been passed in this run of the transport. In this case, continue_more will be
2279 true, and all we should do is send RSET if necessary, and return, leaving the
2282 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2283 do not want to continue with other messages down the same channel, because that
2284 can lead to looping between two or more messages, all with the same,
2285 temporarily failing address(es). [The retry information isn't updated yet, so
2286 new processes keep on trying.] We probably also don't want to try more of this
2287 message's addresses either.
2289 If we have started a TLS session, we have to end it before passing the
2290 connection to a new process. However, not all servers can handle this (Exim
2291 can), so we do not pass such a connection on if the host matches
2292 hosts_nopass_tls. */
2295 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2296 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2297 continue_more, yield, (first_addr == NULL)? "":"not ");
2299 if (completed_address && ok && send_quit)
2302 if (first_addr != NULL || continue_more ||
2304 (tls_out.active < 0 ||
2305 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2306 host->address, NULL) != OK)
2308 transport_check_waiting(tblock->name, host->name,
2309 tblock->connection_max_messages, new_message_id, &more)
2317 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2319 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2320 host->address, strerror(save_errno));
2323 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2324 ob->command_timeout)))
2327 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2331 DEBUG(D_transport) debug_printf("%s\n", msg);
2336 /* Either RSET was not needed, or it succeeded */
2340 if (first_addr != NULL) /* More addresses still to be sent */
2341 { /* in this run of the transport */
2342 continue_sequence++; /* Causes * in logging */
2345 if (continue_more) return yield; /* More addresses for another run */
2347 /* Pass the socket to a new Exim process. Before doing so, we must shut
2348 down TLS. Not all MTAs allow for the continuation of the SMTP session
2349 when TLS is shut down. We test for this by sending a new EHLO. If we
2350 don't get a good response, we don't attempt to pass the socket on. */
2353 if (tls_out.active >= 0)
2355 tls_close(FALSE, TRUE);
2359 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2360 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2361 ob->command_timeout);
2365 /* If the socket is successfully passed, we musn't send QUIT (or
2366 indeed anything!) from here. */
2368 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2369 new_message_id, inblock.sock))
2375 /* If RSET failed and there are addresses left, they get deferred. */
2377 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2381 /* End off tidily with QUIT unless the connection has died or the socket has
2382 been passed to another process. There has been discussion on the net about what
2383 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2384 to wait for a response, but on the other hand, there isn't anything one can do
2385 with an error response, other than log it. Exim used to do that. However,
2386 further discussion suggested that it is positively advantageous not to wait for
2387 the response, but to close the session immediately. This is supposed to move
2388 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2389 load from the server. (Hosts that are both servers and clients may not see much
2390 difference, of course.) Further discussion indicated that this was safe to do
2391 on Unix systems which have decent implementations of TCP/IP that leave the
2392 connection around for a while (TIME_WAIT) after the application has gone away.
2393 This enables the response sent by the server to be properly ACKed rather than
2394 timed out, as can happen on broken TCP/IP implementations on other OS.
2396 This change is being made on 31-Jul-98. After over a year of trouble-free
2397 operation, the old commented-out code was removed on 17-Sep-99. */
2400 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2405 tls_close(FALSE, TRUE);
2408 /* Close the socket, and return the appropriate value, first setting
2409 works because the NULL setting is passed back to the calling process, and
2410 remote_max_parallel is forced to 1 when delivering over an existing connection,
2412 If all went well and continue_more is set, we shouldn't actually get here if
2413 there are further addresses, as the return above will be taken. However,
2414 writing RSET might have failed, or there may be other addresses whose hosts are
2415 specified in the transports, and therefore not visible at top level, in which
2416 case continue_more won't get set. */
2418 (void)close(inblock.sock);
2419 continue_transport = NULL;
2420 continue_hostname = NULL;
2427 /*************************************************
2428 * Closedown entry point *
2429 *************************************************/
2431 /* This function is called when exim is passed an open smtp channel
2432 from another incarnation, but the message which it has been asked
2433 to deliver no longer exists. The channel is on stdin.
2435 We might do fancy things like looking for another message to send down
2436 the channel, but if the one we sought has gone, it has probably been
2437 delivered by some other process that itself will seek further messages,
2438 so just close down our connection.
2440 Argument: pointer to the transport instance block
2445 smtp_transport_closedown(transport_instance *tblock)
2447 smtp_transport_options_block *ob =
2448 (smtp_transport_options_block *)(tblock->options_block);
2449 smtp_inblock inblock;
2450 smtp_outblock outblock;
2452 uschar inbuffer[4096];
2453 uschar outbuffer[16];
2455 inblock.sock = fileno(stdin);
2456 inblock.buffer = inbuffer;
2457 inblock.buffersize = sizeof(inbuffer);
2458 inblock.ptr = inbuffer;
2459 inblock.ptrend = inbuffer;
2461 outblock.sock = inblock.sock;
2462 outblock.buffersize = sizeof(outbuffer);
2463 outblock.buffer = outbuffer;
2464 outblock.ptr = outbuffer;
2465 outblock.cmd_count = 0;
2466 outblock.authenticating = FALSE;
2468 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2469 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2470 ob->command_timeout);
2471 (void)close(inblock.sock);
2476 /*************************************************
2477 * Prepare addresses for delivery *
2478 *************************************************/
2480 /* This function is called to flush out error settings from previous delivery
2481 attempts to other hosts. It also records whether we got here via an MX record
2482 or not in the more_errno field of the address. We are interested only in
2483 addresses that are still marked DEFER - others may have got delivered to a
2484 previously considered IP address. Set their status to PENDING_DEFER to indicate
2485 which ones are relevant this time.
2488 addrlist the list of addresses
2489 host the host we are delivering to
2491 Returns: the first address for this delivery
2494 static address_item *
2495 prepare_addresses(address_item *addrlist, host_item *host)
2497 address_item *first_addr = NULL;
2499 for (addr = addrlist; addr != NULL; addr = addr->next)
2501 if (addr->transport_return != DEFER) continue;
2502 if (first_addr == NULL) first_addr = addr;
2503 addr->transport_return = PENDING_DEFER;
2504 addr->basic_errno = 0;
2505 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2506 addr->message = NULL;
2508 addr->cipher = NULL;
2509 addr->ourcert = NULL;
2510 addr->peercert = NULL;
2511 addr->peerdn = NULL;
2519 /*************************************************
2520 * Main entry point *
2521 *************************************************/
2523 /* See local README for interface details. As this is a remote transport, it is
2524 given a chain of addresses to be delivered in one connection, if possible. It
2525 always returns TRUE, indicating that each address has its own independent
2526 status set, except if there is a setting up problem, in which case it returns
2530 smtp_transport_entry(
2531 transport_instance *tblock, /* data for this instantiation */
2532 address_item *addrlist) /* addresses we are working on */
2536 int hosts_defer = 0;
2538 int hosts_looked_up = 0;
2539 int hosts_retry = 0;
2540 int hosts_serial = 0;
2541 int hosts_total = 0;
2542 int total_hosts_tried = 0;
2544 BOOL expired = TRUE;
2545 BOOL continuing = continue_hostname != NULL;
2546 uschar *expanded_hosts = NULL;
2548 uschar *tid = string_sprintf("%s transport", tblock->name);
2549 smtp_transport_options_block *ob =
2550 (smtp_transport_options_block *)(tblock->options_block);
2551 host_item *hostlist = addrlist->host_list;
2552 host_item *host = NULL;
2556 debug_printf("%s transport entered\n", tblock->name);
2557 for (addr = addrlist; addr != NULL; addr = addr->next)
2558 debug_printf(" %s\n", addr->address);
2559 if (continuing) debug_printf("already connected to %s [%s]\n",
2560 continue_hostname, continue_host_address);
2563 /* Set the flag requesting that these hosts be added to the waiting
2564 database if the delivery fails temporarily or if we are running with
2565 queue_smtp or a 2-stage queue run. This gets unset for certain
2566 kinds of error, typically those that are specific to the message. */
2568 update_waiting = TRUE;
2570 /* If a host list is not defined for the addresses - they must all have the
2571 same one in order to be passed to a single transport - or if the transport has
2572 a host list with hosts_override set, use the host list supplied with the
2573 transport. It is an error for this not to exist. */
2575 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2577 if (ob->hosts == NULL)
2579 addrlist->message = string_sprintf("%s transport called with no hosts set",
2581 addrlist->transport_return = PANIC;
2582 return FALSE; /* Only top address has status */
2585 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2588 /* If the transport's host list contains no '$' characters, and we are not
2589 randomizing, it is fixed and therefore a chain of hosts can be built once
2590 and for all, and remembered for subsequent use by other calls to this
2591 transport. If, on the other hand, the host list does contain '$', or we are
2592 randomizing its order, we have to rebuild it each time. In the fixed case,
2593 as the hosts string will never be used again, it doesn't matter that we
2594 replace all the : characters with zeros. */
2596 if (ob->hostlist == NULL)
2598 uschar *s = ob->hosts;
2600 if (Ustrchr(s, '$') != NULL)
2602 expanded_hosts = expand_string(s);
2603 if (expanded_hosts == NULL)
2605 addrlist->message = string_sprintf("failed to expand list of hosts "
2606 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2607 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2608 return FALSE; /* Only top address has status */
2610 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2611 "\"%s\"\n", s, expanded_hosts);
2615 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2617 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2619 /* Check that the expansion yielded something useful. */
2620 if (hostlist == NULL)
2623 string_sprintf("%s transport has empty hosts setting", tblock->name);
2624 addrlist->transport_return = PANIC;
2625 return FALSE; /* Only top address has status */
2628 /* If there was no expansion of hosts, save the host list for
2631 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2634 /* This is not the first time this transport has been run in this delivery;
2635 the host list was built previously. */
2637 else hostlist = ob->hostlist;
2640 /* The host list was supplied with the address. If hosts_randomize is set, we
2641 must sort it into a random order if it did not come from MX records and has not
2642 already been randomized (but don't bother if continuing down an existing
2645 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2647 host_item *newlist = NULL;
2648 while (hostlist != NULL)
2650 host_item *h = hostlist;
2651 hostlist = hostlist->next;
2653 h->sort_key = random_number(100);
2655 if (newlist == NULL)
2660 else if (h->sort_key < newlist->sort_key)
2667 host_item *hh = newlist;
2668 while (hh->next != NULL)
2670 if (h->sort_key < hh->next->sort_key) break;
2678 hostlist = addrlist->host_list = newlist;
2682 /* Sort out the default port. */
2684 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2687 /* For each host-plus-IP-address on the list:
2689 . If this is a continued delivery and the host isn't the one with the
2690 current connection, skip.
2692 . If the status is unusable (i.e. previously failed or retry checked), skip.
2694 . If no IP address set, get the address, either by turning the name into
2695 an address, calling gethostbyname if gethostbyname is on, or by calling
2696 the DNS. The DNS may yield multiple addresses, in which case insert the
2697 extra ones into the list.
2699 . Get the retry data if not previously obtained for this address and set the
2700 field which remembers the state of this address. Skip if the retry time is
2701 not reached. If not, remember whether retry data was found. The retry string
2702 contains both the name and the IP address.
2704 . Scan the list of addresses and mark those whose status is DEFER as
2705 PENDING_DEFER. These are the only ones that will be processed in this cycle
2708 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2709 Some addresses may be successfully delivered, others may fail, and yet
2710 others may get temporary errors and so get marked DEFER.
2712 . The return from the delivery attempt is OK if a connection was made and a
2713 valid SMTP dialogue was completed. Otherwise it is DEFER.
2715 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2717 . If fail to connect, or other defer state, add a retry item.
2719 . If there are any addresses whose status is still DEFER, carry on to the
2720 next host/IPaddress, unless we have tried the number of hosts given
2721 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2722 there is some fancy logic for hosts_max_try that means its limit can be
2723 overstepped in some circumstances.
2725 If we get to the end of the list, all hosts have deferred at least one address,
2726 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2727 delivery attempt to those hosts whose last try was before the arrival time of
2728 the current message. To cope with this, we have to go round the loop a second
2729 time. After that, set the status and error data for any addresses that haven't
2730 had it set already. */
2732 for (cutoff_retry = 0; expired &&
2733 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2736 host_item *nexthost = NULL;
2737 int unexpired_hosts_tried = 0;
2739 for (host = hostlist;
2741 unexpired_hosts_tried < ob->hosts_max_try &&
2742 total_hosts_tried < ob->hosts_max_try_hardlimit;
2748 BOOL serialized = FALSE;
2749 BOOL host_is_expired = FALSE;
2750 BOOL message_defer = FALSE;
2751 BOOL ifchanges = FALSE;
2752 BOOL some_deferred = FALSE;
2753 address_item *first_addr = NULL;
2754 uschar *interface = NULL;
2755 uschar *retry_host_key = NULL;
2756 uschar *retry_message_key = NULL;
2757 uschar *serialize_key = NULL;
2759 /* Default next host is next host. :-) But this can vary if the
2760 hosts_max_try limit is hit (see below). It may also be reset if a host
2761 address is looked up here (in case the host was multihomed). */
2763 nexthost = host->next;
2765 /* If the address hasn't yet been obtained from the host name, look it up
2766 now, unless the host is already marked as unusable. If it is marked as
2767 unusable, it means that the router was unable to find its IP address (in
2768 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2769 the lookup failed last time. We don't get this far if *all* MX records
2770 point to non-existent hosts; that is treated as a hard error.
2772 We can just skip this host entirely. When the hosts came from the router,
2773 the address will timeout based on the other host(s); when the address is
2774 looked up below, there is an explicit retry record added.
2776 Note that we mustn't skip unusable hosts if the address is not unset; they
2777 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2779 if (host->address == NULL)
2781 int new_port, flags;
2783 uschar *canonical_name;
2785 if (host->status >= hstatus_unusable)
2787 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2792 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2794 /* The host name is permitted to have an attached port. Find it, and
2795 strip it from the name. Just remember it for now. */
2797 new_port = host_item_get_port(host);
2799 /* Count hosts looked up */
2803 /* Find by name if so configured, or if it's an IP address. We don't
2804 just copy the IP address, because we need the test-for-local to happen. */
2806 flags = HOST_FIND_BY_A;
2807 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2808 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2810 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2811 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2813 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2814 ob->dnssec_request_domains, ob->dnssec_require_domains,
2815 &canonical_name, NULL);
2817 /* Update the host (and any additional blocks, resulting from
2818 multihoming) with a host-specific port, if any. */
2820 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2822 /* Failure to find the host at this time (usually DNS temporary failure)
2823 is really a kind of routing failure rather than a transport failure.
2824 Therefore we add a retry item of the routing kind, not to stop us trying
2825 to look this name up here again, but to ensure the address gets timed
2826 out if the failures go on long enough. A complete failure at this point
2827 commonly points to a configuration error, but the best action is still
2828 to carry on for the next host. */
2830 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2832 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2834 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2835 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2836 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2837 host->status = hstatus_unusable;
2839 for (addr = addrlist; addr != NULL; addr = addr->next)
2841 if (addr->transport_return != DEFER) continue;
2842 addr->basic_errno = ERRNO_UNKNOWNHOST;
2844 string_sprintf("failed to lookup IP address for %s", host->name);
2849 /* If the host is actually the local host, we may have a problem, or
2850 there may be some cunning configuration going on. In the problem case,
2851 log things and give up. The default transport status is already DEFER. */
2853 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2855 for (addr = addrlist; addr != NULL; addr = addr->next)
2857 addr->basic_errno = 0;
2858 addr->message = string_sprintf("%s transport found host %s to be "
2859 "local", tblock->name, host->name);
2863 } /* End of block for IP address lookup */
2865 /* If this is a continued delivery, we are interested only in the host
2866 which matches the name of the existing open channel. The check is put
2867 here after the local host lookup, in case the name gets expanded as a
2868 result of the lookup. Set expired FALSE, to save the outer loop executing
2871 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2872 Ustrcmp(continue_host_address, host->address) != 0))
2875 continue; /* With next host */
2878 /* Reset the default next host in case a multihomed host whose addresses
2879 are not looked up till just above added to the host list. */
2881 nexthost = host->next;
2883 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2884 domain is in queue_smtp_domains, we don't actually want to attempt any
2885 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2886 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2887 were not in it. We don't want to hold up all SMTP deliveries! Except when
2888 doing a two-stage queue run, don't do this if forcing. */
2890 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2891 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2892 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2895 for (addr = addrlist; addr != NULL; addr = addr->next)
2897 if (addr->transport_return != DEFER) continue;
2898 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2900 continue; /* With next host */
2903 /* Count hosts being considered - purely for an intelligent comment
2904 if none are usable. */
2908 /* Set $host and $host address now in case they are needed for the
2909 interface expansion or the serialize_hosts check; they remain set if an
2910 actual delivery happens. */
2912 deliver_host = host->name;
2913 deliver_host_address = host->address;
2915 /* Set up a string for adding to the retry key if the port number is not
2916 the standard SMTP port. A host may have its own port setting that overrides
2919 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2921 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2923 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2924 string changes upon expansion, we must add it to the key that is used for
2925 retries, because connections to the same host from a different interface
2926 should be treated separately. */
2928 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2929 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2932 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2934 /* The first time round the outer loop, check the status of the host by
2935 inspecting the retry data. The second time round, we are interested only
2936 in expired hosts that haven't been tried since this message arrived. */
2938 if (cutoff_retry == 0)
2940 /* Ensure the status of the address is set by checking retry data if
2941 necessary. There maybe host-specific retry data (applicable to all
2942 messages) and also data for retries of a specific message at this host.
2943 If either of these retry records are actually read, the keys used are
2944 returned to save recomputing them later. */
2946 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2947 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2949 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2950 (host->address == NULL)? US"" : host->address, pistring,
2951 (host->status == hstatus_usable)? "usable" :
2952 (host->status == hstatus_unusable)? "unusable" :
2953 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2955 /* Skip this address if not usable at this time, noting if it wasn't
2956 actually expired, both locally and in the address. */
2958 switch (host->status)
2960 case hstatus_unusable:
2962 setflag(addrlist, af_retry_skipped);
2965 case hstatus_unusable_expired:
2968 case hwhy_retry: hosts_retry++; break;
2969 case hwhy_failed: hosts_fail++; break;
2970 case hwhy_deferred: hosts_defer++; break;
2973 /* If there was a retry message key, implying that previously there
2974 was a message-specific defer, we don't want to update the list of
2975 messages waiting for these hosts. */
2977 if (retry_message_key != NULL) update_waiting = FALSE;
2978 continue; /* With the next host or IP address */
2982 /* Second time round the loop: if the address is set but expired, and
2983 the message is newer than the last try, let it through. */
2987 if (host->address == NULL ||
2988 host->status != hstatus_unusable_expired ||
2989 host->last_try > received_time)
2992 debug_printf("trying expired host %s [%s]%s\n",
2993 host->name, host->address, pistring);
2994 host_is_expired = TRUE;
2997 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2998 it remains TRUE only if all hosts are expired and none are actually tried.
3003 /* If this host is listed as one to which access must be serialized,
3004 see if another Exim process has a connection to it, and if so, skip
3005 this host. If not, update the database to record our connection to it
3006 and remember this for later deletion. Do not do any of this if we are
3007 sending the message down a pre-existing connection. */
3010 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3011 host->address, NULL) == OK)
3013 serialize_key = string_sprintf("host-serialize-%s", host->name);
3014 if (!enq_start(serialize_key))
3017 debug_printf("skipping host %s because another Exim process "
3018 "is connected to it\n", host->name);
3025 /* OK, we have an IP address that is not waiting for its retry time to
3026 arrive (it might be expired) OR (second time round the loop) we have an
3027 expired host that hasn't been tried since the message arrived. Have a go
3028 at delivering the message to it. First prepare the addresses by flushing
3029 out the result of previous attempts, and finding the first address that
3030 is still to be delivered. */
3032 first_addr = prepare_addresses(addrlist, host);
3034 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3035 message_id, host->name, host->address, addrlist->address,
3036 (addrlist->next == NULL)? "" : ", ...");
3038 set_process_info("delivering %s to %s [%s] (%s%s)",
3039 message_id, host->name, host->address, addrlist->address,
3040 (addrlist->next == NULL)? "" : ", ...");
3042 /* This is not for real; don't do the delivery. If there are
3043 any remaining hosts, list them. */
3048 set_errno(addrlist, 0, NULL, OK, FALSE);
3049 for (addr = addrlist; addr != NULL; addr = addr->next)
3051 addr->host_used = host;
3052 addr->special_action = '*';
3053 addr->message = US"delivery bypassed by -N option";
3057 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3058 "*** host and remaining hosts:\n", tblock->name);
3059 for (host2 = host; host2 != NULL; host2 = host2->next)
3060 debug_printf(" %s [%s]\n", host2->name,
3061 (host2->address == NULL)? US"unset" : host2->address);
3066 /* This is for real. If the host is expired, we don't count it for
3067 hosts_max_retry. This ensures that all hosts must expire before an address
3068 is timed out, unless hosts_max_try_hardlimit (which protects against
3069 lunatic DNS configurations) is reached.
3071 If the host is not expired and we are about to hit the hosts_max_retry
3072 limit, check to see if there is a subsequent hosts with a different MX
3073 value. If so, make that the next host, and don't count this one. This is a
3074 heuristic to make sure that different MXs do get tried. With a normal kind
3075 of retry rule, they would get tried anyway when the earlier hosts were
3076 delayed, but if the domain has a "retry every time" type of rule - as is
3077 often used for the the very large ISPs, that won't happen. */
3081 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3085 debug_printf("hosts_max_try limit reached with this host\n");
3086 for (h = host; h != NULL; h = h->next)
3087 if (h->mx != host->mx) break;
3091 unexpired_hosts_tried--;
3092 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3093 "and will be tried\n");
3097 /* Attempt the delivery. */
3099 total_hosts_tried++;
3100 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3101 expanded_hosts != NULL, &message_defer, FALSE);
3104 OK => connection made, each address contains its result;
3105 message_defer is set for message-specific defers (when all
3106 recipients are marked defer)
3107 DEFER => there was a non-message-specific delivery problem;
3108 ERROR => there was a problem setting up the arguments for a filter,
3109 or there was a problem with expanding added headers
3112 /* If the result is not OK, there was a non-message-specific problem.
3113 If the result is DEFER, we need to write to the logs saying what happened
3114 for this particular host, except in the case of authentication and TLS
3115 failures, where the log has already been written. If all hosts defer a
3116 general message is written at the end. */
3118 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3119 first_addr->basic_errno != ERRNO_TLSFAILURE)
3120 write_logs(first_addr, host);
3122 #ifdef EXPERIMENTAL_TPDA
3124 tpda_deferred(ob, first_addr, host);
3127 /* If STARTTLS was accepted, but there was a failure in setting up the
3128 TLS session (usually a certificate screwup), and the host is not in
3129 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3130 TLS forcibly turned off. We have to start from scratch with a new SMTP
3131 connection. That's why the retry is done from here, not from within
3132 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3133 session, so the in-clear transmission after those errors, if permitted,
3134 happens inside smtp_deliver().] */
3137 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3138 ob->tls_tempfail_tryclear &&
3139 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3140 host->address, NULL) != OK)
3142 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3143 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3144 first_addr = prepare_addresses(addrlist, host);
3145 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3146 expanded_hosts != NULL, &message_defer, TRUE);
3147 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3148 write_logs(first_addr, host);
3149 #ifdef EXPERIMENTAL_TPDA
3151 tpda_deferred(ob, first_addr, host);
3157 /* Delivery attempt finished */
3159 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3162 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3163 message_id, host->name, host->address, addrlist->address,
3164 (addrlist->next == NULL)? "" : " (& others)", rs);
3166 /* Release serialization if set up */
3168 if (serialized) enq_end(serialize_key);
3170 /* If the result is DEFER, or if a host retry record is known to exist, we
3171 need to add an item to the retry chain for updating the retry database
3172 at the end of delivery. We only need to add the item to the top address,
3173 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3174 for any other delivery attempts using the same address. (It is copied into
3175 the unusable tree at the outer level, so even if different address blocks
3176 contain the same address, it still won't get tried again.) */
3178 if (rc == DEFER || retry_host_key != NULL)
3180 int delete_flag = (rc != DEFER)? rf_delete : 0;
3181 if (retry_host_key == NULL)
3183 retry_host_key = ob->retry_include_ip_address?
3184 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3185 string_sprintf("T:%S%s", host->name, pistring);
3188 /* If a delivery of another message over an existing SMTP connection
3189 yields DEFER, we do NOT set up retry data for the host. This covers the
3190 case when there are delays in routing the addresses in the second message
3191 that are so long that the server times out. This is alleviated by not
3192 routing addresses that previously had routing defers when handling an
3193 existing connection, but even so, this case may occur (e.g. if a
3194 previously happily routed address starts giving routing defers). If the
3195 host is genuinely down, another non-continued message delivery will
3196 notice it soon enough. */
3198 if (delete_flag != 0 || !continuing)
3199 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3201 /* We may have tried an expired host, if its retry time has come; ensure
3202 the status reflects the expiry for the benefit of any other addresses. */
3206 host->status = (host_is_expired)?
3207 hstatus_unusable_expired : hstatus_unusable;
3208 host->why = hwhy_deferred;
3212 /* If message_defer is set (host was OK, but every recipient got deferred
3213 because of some message-specific problem), or if that had happened
3214 previously so that a message retry key exists, add an appropriate item
3215 to the retry chain. Note that if there was a message defer but now there is
3216 a host defer, the message defer record gets deleted. That seems perfectly
3217 reasonable. Also, stop the message from being remembered as waiting
3218 for specific hosts. */
3220 if (message_defer || retry_message_key != NULL)
3222 int delete_flag = message_defer? 0 : rf_delete;
3223 if (retry_message_key == NULL)
3225 retry_message_key = ob->retry_include_ip_address?
3226 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3228 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3230 retry_add_item(addrlist, retry_message_key,
3231 rf_message | rf_host | delete_flag);
3232 update_waiting = FALSE;
3235 /* Any return other than DEFER (that is, OK or ERROR) means that the
3236 addresses have got their final statuses filled in for this host. In the OK
3237 case, see if any of them are deferred. */
3241 for (addr = addrlist; addr != NULL; addr = addr->next)
3243 if (addr->transport_return == DEFER)
3245 some_deferred = TRUE;
3251 /* If no addresses deferred or the result was ERROR, return. We do this for
3252 ERROR because a failing filter set-up or add_headers expansion is likely to
3253 fail for any host we try. */
3255 if (rc == ERROR || (rc == OK && !some_deferred))
3257 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3258 return TRUE; /* Each address has its status */
3261 /* If the result was DEFER or some individual addresses deferred, let
3262 the loop run to try other hosts with the deferred addresses, except for the
3263 case when we were trying to deliver down an existing channel and failed.
3264 Don't try any other hosts in this case. */
3266 if (continuing) break;
3268 /* If the whole delivery, or some individual addresses, were deferred and
3269 there are more hosts that could be tried, do not count this host towards
3270 the hosts_max_try limit if the age of the message is greater than the
3271 maximum retry time for this host. This means we may try try all hosts,
3272 ignoring the limit, when messages have been around for some time. This is
3273 important because if we don't try all hosts, the address will never time
3274 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3276 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3279 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3281 if (retry != NULL && retry->rules != NULL)
3283 retry_rule *last_rule;
3284 for (last_rule = retry->rules;
3285 last_rule->next != NULL;
3286 last_rule = last_rule->next);
3287 timedout = time(NULL) - received_time > last_rule->timeout;
3289 else timedout = TRUE; /* No rule => timed out */
3293 unexpired_hosts_tried--;
3294 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3295 "hosts_max_try (message older than host's retry time)\n");
3298 } /* End of loop for trying multiple hosts. */
3300 /* This is the end of the loop that repeats iff expired is TRUE and
3301 ob->delay_after_cutoff is FALSE. The second time round we will
3302 try those hosts that haven't been tried since the message arrived. */
3306 debug_printf("all IP addresses skipped or deferred at least one address\n");
3307 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3308 debug_printf("retrying IP addresses not tried since message arrived\n");
3313 /* Get here if all IP addresses are skipped or defer at least one address. In
3314 MUA wrapper mode, this will happen only for connection or other non-message-
3315 specific failures. Force the delivery status for all addresses to FAIL. */
3319 for (addr = addrlist; addr != NULL; addr = addr->next)
3320 addr->transport_return = FAIL;
3324 /* In the normal, non-wrapper case, add a standard message to each deferred
3325 address if there hasn't been an error, that is, if it hasn't actually been
3326 tried this time. The variable "expired" will be FALSE if any deliveries were
3327 actually tried, or if there was at least one host that was not expired. That
3328 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3329 a delivery has been tried, an error code will be set, and the failing of the
3330 message is handled by the retry code later.
3332 If queue_smtp is set, or this transport was called to send a subsequent message
3333 down an existing TCP/IP connection, and something caused the host not to be
3334 found, we end up here, but can detect these cases and handle them specially. */
3336 for (addr = addrlist; addr != NULL; addr = addr->next)
3338 /* If host is not NULL, it means that we stopped processing the host list
3339 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3340 means we need to behave as if some hosts were skipped because their retry
3341 time had not come. Specifically, this prevents the address from timing out.
3342 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3343 hosts were tried. */
3347 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3350 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3351 "hosts were tried\n");
3356 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3357 setflag(addr, af_retry_skipped);
3361 if (queue_smtp) /* no deliveries attempted */
3363 addr->transport_return = DEFER;
3364 addr->basic_errno = 0;
3365 addr->message = US"SMTP delivery explicitly queued";
3368 else if (addr->transport_return == DEFER &&
3369 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3370 addr->message == NULL)
3372 addr->basic_errno = ERRNO_HRETRY;
3373 if (continue_hostname != NULL)
3375 addr->message = US"no host found for existing SMTP connection";
3379 setflag(addr, af_pass_message); /* This is not a security risk */
3380 addr->message = (ob->delay_after_cutoff)?
3381 US"retry time not reached for any host after a long failure period" :
3382 US"all hosts have been failing for a long time and were last tried "
3383 "after this message arrived";
3385 /* If we are already using fallback hosts, or there are no fallback hosts
3386 defined, convert the result to FAIL to cause a bounce. */
3388 if (addr->host_list == addr->fallback_hosts ||
3389 addr->fallback_hosts == NULL)
3390 addr->transport_return = FAIL;
3394 if (hosts_retry == hosts_total)
3395 addr->message = US"retry time not reached for any host";
3396 else if (hosts_fail == hosts_total)
3397 addr->message = US"all host address lookups failed permanently";
3398 else if (hosts_defer == hosts_total)
3399 addr->message = US"all host address lookups failed temporarily";
3400 else if (hosts_serial == hosts_total)
3401 addr->message = US"connection limit reached for all hosts";
3402 else if (hosts_fail+hosts_defer == hosts_total)
3403 addr->message = US"all host address lookups failed";
3404 else addr->message = US"some host address lookups failed and retry time "
3405 "not reached for other hosts or connection limit reached";
3410 /* Update the database which keeps information about which messages are waiting
3411 for which hosts to become available. For some message-specific errors, the
3412 update_waiting flag is turned off because we don't want follow-on deliveries in
3413 those cases. If this transport instance is explicitly limited to one message
3414 per connection then follow-on deliveries are not possible and there's no need
3415 to create/update the per-transport wait-<transport_name> database. */
3417 if (update_waiting && tblock->connection_max_messages != 1)
3418 transport_update_waiting(hostlist, tblock->name);
3422 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3424 return TRUE; /* Each address has its status */
3429 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob