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.peerdn = NULL;
1225 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1229 /* Flip the legacy TLS-related variables over to the outbound set in case
1230 they're used in the context of the transport. Don't bother resetting
1231 afterward as we're in a subprocess. */
1233 tls_modify_variables(&tls_out);
1238 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1243 /* Make a connection to the host if this isn't a continued delivery, and handle
1244 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1245 specially so they can be identified for retries. */
1247 if (continue_hostname == NULL)
1249 inblock.sock = outblock.sock =
1250 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1251 ob->keepalive, ob->dscp); /* This puts port into host->port */
1253 if (inblock.sock < 0)
1255 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1256 NULL, DEFER, FALSE);
1260 /* Expand the greeting message while waiting for the initial response. (Makes
1261 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1262 delayed till here so that $sending_interface and $sending_port are set. */
1264 helo_data = expand_string(ob->helo_data);
1266 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1267 is nevertheless a reasonably clean way of programming this kind of logic,
1268 where you want to escape on any error. */
1272 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1273 ob->command_timeout)) goto RESPONSE_FAILED;
1275 /* Now check if the helo_data expansion went well, and sign off cleanly if
1278 if (helo_data == NULL)
1280 uschar *message = string_sprintf("failed to expand helo_data: %s",
1281 expand_string_message);
1282 set_errno(addrlist, 0, message, DEFER, FALSE);
1288 /** Debugging without sending a message
1289 addrlist->transport_return = DEFER;
1293 /* Errors that occur after this point follow an SMTP command, which is
1294 left in big_buffer by smtp_write_command() for use in error messages. */
1296 smtp_command = big_buffer;
1298 /* Tell the remote who we are...
1300 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1301 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1302 greeting is of this form. The assumption was that the far end supports it
1303 properly... but experience shows that there are some that give 5xx responses,
1304 even though the banner includes "ESMTP" (there's a bloody-minded one that
1305 says "ESMTP not spoken here"). Cope with that case.
1307 September 2000: Time has passed, and it seems reasonable now to always send
1308 EHLO at the start. It is also convenient to make the change while installing
1311 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1312 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1313 would be no way to send out the mails, so there is now a host list
1314 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1315 PIPELINING problem as well. Maybe it can also be useful to cure other
1316 problems with broken servers.
1318 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1319 Then somebody tried it with a Microsoft mailer... It seems that all other
1320 mailers use upper case for some reason (the RFC is quite clear about case
1321 independence) so, for peace of mind, I gave in. */
1323 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1324 host->name, host->address, NULL) != OK;
1326 /* Alas; be careful, since this goto is not an error-out, so conceivably
1327 we might set data between here and the target which we assume to exist
1328 and be usable. I can see this coming back to bite us. */
1333 suppress_tls = FALSE;
1334 ob->tls_tempfail_tryclear = FALSE;
1335 smtp_command = US"SSL-on-connect";
1342 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1343 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1345 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1346 ob->command_timeout))
1348 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1355 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1360 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1362 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1363 ob->command_timeout)) goto RESPONSE_FAILED;
1366 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1367 lmtp_ignore_quota option was set. */
1369 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1370 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1371 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1373 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1376 tls_offered = esmtp &&
1377 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1378 PCRE_EOPT, NULL, 0) >= 0;
1381 #ifdef EXPERIMENTAL_PRDR
1382 prdr_offered = esmtp &&
1383 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1384 PCRE_EOPT, NULL, 0) >= 0) &&
1385 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1386 host->address, NULL) == OK);
1389 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1393 /* For continuing deliveries down the same channel, the socket is the standard
1394 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1395 below). Set up the pointer to where subsequent commands will be left, for
1396 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1397 set from the command line if they were set in the process that passed the
1402 inblock.sock = outblock.sock = fileno(stdin);
1403 smtp_command = big_buffer;
1404 host->port = port; /* Record the port that was used */
1407 /* If TLS is available on this connection, whether continued or not, attempt to
1408 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1409 send another EHLO - the server may give a different answer in secure mode. We
1410 use a separate buffer for reading the response to STARTTLS so that if it is
1411 negative, the original EHLO data is available for subsequent analysis, should
1412 the client not be required to use TLS. If the response is bad, copy the buffer
1413 for error analysis. */
1416 if (tls_offered && !suppress_tls &&
1417 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1418 host->address, NULL) != OK)
1420 uschar buffer2[4096];
1421 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1424 /* If there is an I/O error, transmission of this message is deferred. If
1425 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1426 false, we also defer. However, if there is a temporary rejection of STARTTLS
1427 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1428 STARTTLS, we carry on. This means we will try to send the message in clear,
1429 unless the host is in hosts_require_tls (tested below). */
1431 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1432 ob->command_timeout))
1434 if (errno != 0 || buffer2[0] == 0 ||
1435 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1437 Ustrncpy(buffer, buffer2, sizeof(buffer));
1438 goto RESPONSE_FAILED;
1442 /* STARTTLS accepted: try to negotiate a TLS session. */
1447 int rc = tls_client_start(inblock.sock,
1450 ob->tls_certificate,
1453 ob->tls_verify_certificates,
1455 ob->tls_require_ciphers,
1456 #ifdef EXPERIMENTAL_OCSP
1457 ob->hosts_require_ocsp,
1459 ob->tls_dh_min_bits,
1460 ob->command_timeout,
1461 ob->tls_verify_hosts,
1462 ob->tls_try_verify_hosts);
1464 /* TLS negotiation failed; give an error. From outside, this function may
1465 be called again to try in clear on a new connection, if the options permit
1466 it for this host. */
1470 save_errno = ERRNO_TLSFAILURE;
1471 message = US"failure while setting up TLS session";
1476 /* TLS session is set up */
1478 for (addr = addrlist; addr != NULL; addr = addr->next)
1480 if (addr->transport_return == PENDING_DEFER)
1482 addr->cipher = tls_out.cipher;
1483 addr->peerdn = tls_out.peerdn;
1489 /* if smtps, we'll have smtp_command set to something else; always safe to
1491 smtp_command = big_buffer;
1493 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1494 helo_data is null, we are dealing with a connection that was passed from
1495 another process, and so we won't have expanded helo_data above. We have to
1496 expand it here. $sending_ip_address and $sending_port are set up right at the
1497 start of the Exim process (in exim.c). */
1499 if (tls_out.active >= 0)
1502 if (helo_data == NULL)
1504 helo_data = expand_string(ob->helo_data);
1505 if (helo_data == NULL)
1507 uschar *message = string_sprintf("failed to expand helo_data: %s",
1508 expand_string_message);
1509 set_errno(addrlist, 0, message, DEFER, FALSE);
1515 /* For SMTPS we need to wait for the initial OK response. */
1518 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1519 ob->command_timeout)) goto RESPONSE_FAILED;
1523 greeting_cmd = "EHLO";
1526 greeting_cmd = "HELO";
1528 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1531 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1532 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1534 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1535 ob->command_timeout))
1536 goto RESPONSE_FAILED;
1539 /* If the host is required to use a secure channel, ensure that we
1542 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1543 host->address, NULL) == OK)
1545 save_errno = ERRNO_TLSREQUIRED;
1546 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1547 host->name, host->address,
1548 tls_offered? "an attempt to start TLS failed" :
1549 "the server did not offer TLS support");
1554 /* If TLS is active, we have just started it up and re-done the EHLO command,
1555 so its response needs to be analyzed. If TLS is not active and this is a
1556 continued session down a previously-used socket, we haven't just done EHLO, so
1559 if (continue_hostname == NULL
1561 || tls_out.active >= 0
1565 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1566 lmtp_ignore_quota option was set. */
1568 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1569 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1570 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1572 /* If the response to EHLO specified support for the SIZE parameter, note
1573 this, provided size_addition is non-negative. */
1575 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1576 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1577 PCRE_EOPT, NULL, 0) >= 0;
1579 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1580 the current host, esmtp will be false, so PIPELINING can never be used. If
1581 the current host matches hosts_avoid_pipelining, don't do it. */
1583 smtp_use_pipelining = esmtp &&
1584 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1585 host->address, NULL) != OK &&
1586 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1587 PCRE_EOPT, NULL, 0) >= 0;
1589 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1590 smtp_use_pipelining? "" : "not ");
1592 #ifdef EXPERIMENTAL_PRDR
1593 prdr_offered = esmtp &&
1594 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1595 PCRE_EOPT, NULL, 0) >= 0 &&
1596 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1597 host->address, NULL) == OK;
1600 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1603 /* Note if the response to EHLO specifies support for the AUTH extension.
1604 If it has, check that this host is one we want to authenticate to, and do
1605 the business. The host name and address must be available when the
1606 authenticator's client driver is running. */
1608 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1609 ob, esmtp, &inblock, &outblock))
1611 default: goto SEND_QUIT;
1613 case FAIL_SEND: goto SEND_FAILED;
1614 case FAIL: goto RESPONSE_FAILED;
1618 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1619 message-specific. */
1623 /* If there is a filter command specified for this transport, we can now
1624 set it up. This cannot be done until the identify of the host is known. */
1626 if (tblock->filter_command != NULL)
1630 sprintf(CS buffer, "%.50s transport", tblock->name);
1631 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1632 TRUE, DEFER, addrlist, buffer, NULL);
1633 transport_filter_timeout = tblock->filter_timeout;
1635 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1640 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1648 /* For messages that have more than the maximum number of envelope recipients,
1649 we want to send several transactions down the same SMTP connection. (See
1650 comments in deliver.c as to how this reconciles, heuristically, with
1651 remote_max_parallel.) This optimization was added to Exim after the following
1652 code was already working. The simplest way to put it in without disturbing the
1653 code was to use a goto to jump back to this point when there is another
1654 transaction to handle. */
1657 sync_addr = first_addr;
1661 completed_address = FALSE;
1664 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1665 qualification, send it, adding something to the message size to allow for
1666 imprecision and things that get added en route. Exim keeps the number of lines
1667 in a message, so we can give an accurate value for the original message, but we
1668 need some additional to handle added headers. (Double "." characters don't get
1669 included in the count.) */
1676 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1680 #ifdef EXPERIMENTAL_PRDR
1681 prdr_active = FALSE;
1684 for (addr = first_addr; addr; addr = addr->next)
1685 if (addr->transport_return == PENDING_DEFER)
1687 for (addr = addr->next; addr; addr = addr->next)
1688 if (addr->transport_return == PENDING_DEFER)
1689 { /* at least two recipients to send */
1691 sprintf(CS p, " PRDR"); p += 5;
1692 goto prdr_is_active;
1700 /* If an authenticated_sender override has been specified for this transport
1701 instance, expand it. If the expansion is forced to fail, and there was already
1702 an authenticated_sender for this message, the original value will be used.
1703 Other expansion failures are serious. An empty result is ignored, but there is
1704 otherwise no check - this feature is expected to be used with LMTP and other
1705 cases where non-standard addresses (e.g. without domains) might be required. */
1707 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1710 /* From here until we send the DATA command, we can make use of PIPELINING
1711 if the server host supports it. The code has to be able to check the responses
1712 at any point, for when the buffer fills up, so we write it totally generally.
1713 When PIPELINING is off, each command written reports that it has flushed the
1716 pending_MAIL = TRUE; /* The block starts with MAIL */
1718 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1719 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1720 mail_command = string_copy(big_buffer); /* Save for later error message */
1724 case -1: /* Transmission error */
1727 case +1: /* Block was sent */
1728 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1729 ob->command_timeout))
1731 if (errno == 0 && buffer[0] == '4')
1733 errno = ERRNO_MAIL4XX;
1734 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1736 goto RESPONSE_FAILED;
1738 pending_MAIL = FALSE;
1742 /* Pass over all the relevant recipient addresses for this host, which are the
1743 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1744 several before we have to read the responses for those seen so far. This
1745 checking is done by a subroutine because it also needs to be done at the end.
1746 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1747 the next one if not all are sent.
1749 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1750 last address because we want to abort if any recipients have any kind of
1751 problem, temporary or permanent. We know that all recipient addresses will have
1752 the PENDING_DEFER status, because only one attempt is ever made, and we know
1753 that max_rcpt will be large, so all addresses will be done at once. */
1755 for (addr = first_addr;
1756 address_count < max_rcpt && addr != NULL;
1762 if (addr->transport_return != PENDING_DEFER) continue;
1765 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1767 /* Now send the RCPT command, and process outstanding responses when
1768 necessary. After a timeout on RCPT, we just end the function, leaving the
1769 yield as OK, because this error can often mean that there is a problem with
1770 just one address, so we don't want to delay the host. */
1772 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1773 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1774 if (count < 0) goto SEND_FAILED;
1777 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1778 &sync_addr, host, count, ob->address_retry_include_sender,
1779 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1782 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1783 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1786 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1787 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1788 case 0: /* No 2xx or 5xx, but no probs */
1791 case -1: goto END_OFF; /* Timeout on RCPT */
1792 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1794 pending_MAIL = FALSE; /* Dealt with MAIL */
1796 } /* Loop for next address */
1798 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1799 permanently or temporarily. We should have flushed and synced after the last
1804 address_item *badaddr;
1805 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1807 if (badaddr->transport_return != PENDING_OK) break;
1809 if (badaddr != NULL)
1811 set_errno(addrlist, 0, badaddr->message, FAIL,
1812 testflag(badaddr, af_pass_message));
1817 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1818 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1819 have a good recipient buffered up if we are pipelining. We don't want to waste
1820 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1821 are pipelining. The responses are all handled by sync_responses(). */
1823 if (ok || (smtp_use_pipelining && !mua_wrapper))
1825 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1826 if (count < 0) goto SEND_FAILED;
1827 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1828 host, count, ob->address_retry_include_sender, pending_MAIL,
1829 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1831 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1832 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1835 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1836 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1837 case 0: break; /* No 2xx or 5xx, but no probs */
1839 case -1: goto END_OFF; /* Timeout on RCPT */
1840 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1844 /* Save the first address of the next batch. */
1848 /* If there were no good recipients (but otherwise there have been no
1849 problems), just set ok TRUE, since we have handled address-specific errors
1850 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1851 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1852 well as body. Set the appropriate timeout value to be used for each chunk.
1853 (Haven't been able to make it work using select() for writing yet.) */
1855 if (!ok) ok = TRUE; else
1857 sigalrm_seen = FALSE;
1858 transport_write_timeout = ob->data_timeout;
1859 smtp_command = US"sending data block"; /* For error messages */
1860 DEBUG(D_transport|D_v)
1861 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1862 transport_count = 0;
1863 #ifndef DISABLE_DKIM
1864 ok = dkim_transport_write_message(addrlist, inblock.sock,
1865 topt_use_crlf | topt_end_dot | topt_escape_headers |
1866 (tblock->body_only? topt_no_headers : 0) |
1867 (tblock->headers_only? topt_no_body : 0) |
1868 (tblock->return_path_add? topt_add_return_path : 0) |
1869 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1870 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1871 0, /* No size limit */
1872 tblock->add_headers, tblock->remove_headers,
1873 US".", US"..", /* Escaping strings */
1874 tblock->rewrite_rules, tblock->rewrite_existflags,
1875 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1876 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1879 ok = transport_write_message(addrlist, inblock.sock,
1880 topt_use_crlf | topt_end_dot | topt_escape_headers |
1881 (tblock->body_only? topt_no_headers : 0) |
1882 (tblock->headers_only? topt_no_body : 0) |
1883 (tblock->return_path_add? topt_add_return_path : 0) |
1884 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1885 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1886 0, /* No size limit */
1887 tblock->add_headers, tblock->remove_headers,
1888 US".", US"..", /* Escaping strings */
1889 tblock->rewrite_rules, tblock->rewrite_existflags);
1892 /* transport_write_message() uses write() because it is called from other
1893 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1894 it can exit with "Broken pipe" as its error. This really means that the
1895 socket got closed at the far end. */
1897 transport_write_timeout = 0; /* for subsequent transports */
1899 /* Failure can either be some kind of I/O disaster (including timeout),
1900 or the failure of a transport filter or the expansion of added headers. */
1904 buffer[0] = 0; /* There hasn't been a response */
1905 goto RESPONSE_FAILED;
1908 /* We used to send the terminating "." explicitly here, but because of
1909 buffering effects at both ends of TCP/IP connections, you don't gain
1910 anything by keeping it separate, so it might as well go in the final
1911 data buffer for efficiency. This is now done by setting the topt_end_dot
1914 smtp_command = US"end of data";
1916 #ifdef EXPERIMENTAL_PRDR
1917 /* For PRDR we optionally get a partial-responses warning
1918 * followed by the individual responses, before going on with
1919 * the overall response. If we don't get the warning then deal
1920 * with per non-PRDR. */
1923 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1925 if (!ok && errno == 0)
1928 case '2': prdr_active = FALSE;
1931 case '4': errno = ERRNO_DATA4XX;
1932 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1939 /* For non-PRDR SMTP, we now read a single response that applies to the
1940 whole message. If it is OK, then all the addresses have been delivered. */
1944 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1946 if (!ok && errno == 0 && buffer[0] == '4')
1948 errno = ERRNO_DATA4XX;
1949 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1953 /* For LMTP, we get back a response for every RCPT command that we sent;
1954 some may be accepted and some rejected. For those that get a response, their
1955 status is fixed; any that are accepted have been handed over, even if later
1956 responses crash - at least, that's how I read RFC 2033.
1958 If all went well, mark the recipient addresses as completed, record which
1959 host/IPaddress they were delivered to, and cut out RSET when sending another
1960 message down the same channel. Write the completed addresses to the journal
1961 now so that they are recorded in case there is a crash of hardware or
1962 software before the spool gets updated. Also record the final SMTP
1963 confirmation if needed (for SMTP only). */
1968 int delivery_time = (int)(time(NULL) - start_delivery_time);
1971 uschar *conf = NULL;
1974 /* Make a copy of the host if it is local to this invocation
1975 of the transport. */
1979 thost = store_get(sizeof(host_item));
1981 thost->name = string_copy(host->name);
1982 thost->address = string_copy(host->address);
1986 /* Set up confirmation if needed - applies only to SMTP */
1989 #ifndef EXPERIMENTAL_TPDA
1990 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1995 uschar *s = string_printing(buffer);
1996 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1999 /* Process all transported addresses - for LMTP or PRDR, read a status for
2002 for (addr = addrlist; addr != first_addr; addr = addr->next)
2004 if (addr->transport_return != PENDING_OK) continue;
2006 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2007 remaining addresses. Otherwise, it's a return code for just the one
2008 address. For temporary errors, add a retry item for the address so that
2009 it doesn't get tried again too soon. */
2011 #ifdef EXPERIMENTAL_PRDR
2012 if (lmtp || prdr_active)
2017 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2020 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2021 addr->message = string_sprintf(
2022 #ifdef EXPERIMENTAL_PRDR
2023 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2025 "LMTP error after %s: %s",
2027 big_buffer, string_printing(buffer));
2028 setflag(addr, af_pass_message); /* Allow message to go to user */
2029 if (buffer[0] == '5')
2030 addr->transport_return = FAIL;
2033 errno = ERRNO_DATA4XX;
2034 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2035 addr->transport_return = DEFER;
2036 #ifdef EXPERIMENTAL_PRDR
2039 retry_add_item(addr, addr->address_retry_key, 0);
2043 completed_address = TRUE; /* NOW we can set this flag */
2044 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2046 uschar *s = string_printing(buffer);
2047 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2051 /* SMTP, or success return from LMTP for this address. Pass back the
2052 actual host that was used. */
2054 addr->transport_return = OK;
2055 addr->more_errno = delivery_time;
2056 addr->host_used = thost;
2057 addr->special_action = flag;
2058 addr->message = conf;
2059 #ifdef EXPERIMENTAL_PRDR
2060 if (prdr_active) addr->flags |= af_prdr_used;
2064 #ifdef EXPERIMENTAL_PRDR
2068 /* Update the journal. For homonymic addresses, use the base address plus
2069 the transport name. See lots of comments in deliver.c about the reasons
2070 for the complications when homonyms are involved. Just carry on after
2071 write error, as it may prove possible to update the spool file later. */
2073 if (testflag(addr, af_homonym))
2074 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2076 sprintf(CS buffer, "%.500s\n", addr->unique);
2078 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2079 len = Ustrlen(CS buffer);
2080 if (write(journal_fd, buffer, len) != len)
2081 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2082 "%s: %s", buffer, strerror(errno));
2086 #ifdef EXPERIMENTAL_PRDR
2089 /* PRDR - get the final, overall response. For any non-success
2090 upgrade all the address statuses. */
2091 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2095 if(errno == 0 && buffer[0] == '4')
2097 errno = ERRNO_DATA4XX;
2098 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2100 for (addr = addrlist; addr != first_addr; addr = addr->next)
2101 if (buffer[0] == '5' || addr->transport_return == OK)
2102 addr->transport_return = PENDING_OK; /* allow set_errno action */
2103 goto RESPONSE_FAILED;
2106 /* Update the journal, or setup retry. */
2107 for (addr = addrlist; addr != first_addr; addr = addr->next)
2108 if (addr->transport_return == OK)
2110 if (testflag(addr, af_homonym))
2111 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2113 sprintf(CS buffer, "%.500s\n", addr->unique);
2115 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2116 len = Ustrlen(CS buffer);
2117 if (write(journal_fd, buffer, len) != len)
2118 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2119 "%s: %s", buffer, strerror(errno));
2121 else if (addr->transport_return == DEFER)
2122 retry_add_item(addr, addr->address_retry_key, -2);
2126 /* Ensure the journal file is pushed out to disk. */
2128 if (EXIMfsync(journal_fd) < 0)
2129 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2135 /* Handle general (not specific to one address) failures here. The value of ok
2136 is used to skip over this code on the falling through case. A timeout causes a
2137 deferral. Other errors may defer or fail according to the response code, and
2138 may set up a special errno value, e.g. after connection chopped, which is
2139 assumed if errno == 0 and there is no text in the buffer. If control reaches
2140 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2141 the problem is not related to this specific message. */
2150 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2151 buffer, &code, &message, &pass_message);
2157 message = US string_sprintf("send() to %s [%s] failed: %s",
2158 host->name, host->address, strerror(save_errno));
2162 /* This label is jumped to directly when a TLS negotiation has failed,
2163 or was not done for a host for which it is required. Values will be set
2164 in message and save_errno, and setting_up will always be true. Treat as
2165 a temporary error. */
2172 /* If the failure happened while setting up the call, see if the failure was
2173 a 5xx response (this will either be on connection, or following HELO - a 5xx
2174 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2175 never going to accept them. For other errors during setting up (timeouts or
2176 whatever), defer all addresses, and yield DEFER, so that the host is not
2177 tried again for a while. */
2180 ok = FALSE; /* For when reached by GOTO */
2186 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2190 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2195 /* We want to handle timeouts after MAIL or "." and loss of connection after
2196 "." specially. They can indicate a problem with the sender address or with
2197 the contents of the message rather than a real error on the connection. These
2198 cases are treated in the same way as a 4xx response. This next bit of code
2199 does the classification. */
2210 message_error = TRUE;
2214 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2215 Ustrncmp(smtp_command,"end ",4) == 0;
2218 case ERRNO_SMTPCLOSED:
2219 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2223 message_error = FALSE;
2227 /* Handle the cases that are treated as message errors. These are:
2229 (a) negative response or timeout after MAIL
2230 (b) negative response after DATA
2231 (c) negative response or timeout or dropped connection after "."
2233 It won't be a negative response or timeout after RCPT, as that is dealt
2234 with separately above. The action in all cases is to set an appropriate
2235 error code for all the addresses, but to leave yield set to OK because the
2236 host itself has not failed. Of course, it might in practice have failed
2237 when we've had a timeout, but if so, we'll discover that at the next
2238 delivery attempt. For a temporary error, set the message_defer flag, and
2239 write to the logs for information if this is not the last host. The error
2240 for the last host will be logged as part of the address's log line. */
2244 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2245 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2248 /* If there's an errno, the message contains just the identity of
2251 if (code != '5') /* Anything other than 5 is treated as temporary */
2254 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2255 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2256 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2257 *message_defer = TRUE;
2261 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2262 ".", or some other transportation error. We defer all addresses and yield
2263 DEFER, except for the case of failed add_headers expansion, or a transport
2264 filter failure, when the yield should be ERROR, to stop it trying other
2269 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2270 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2271 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2277 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2278 SMTP session tidily. However, if there were too many addresses to send in one
2279 message (indicated by first_addr being non-NULL) we want to carry on with the
2280 rest of them. Also, it is desirable to send more than one message down the SMTP
2281 connection if there are several waiting, provided we haven't already sent so
2282 many as to hit the configured limit. The function transport_check_waiting looks
2283 for a waiting message and returns its id. Then transport_pass_socket tries to
2284 set up a continued delivery by passing the socket on to another process. The
2285 variable send_rset is FALSE if a message has just been successfully transfered.
2287 If we are already sending down a continued channel, there may be further
2288 addresses not yet delivered that are aimed at the same host, but which have not
2289 been passed in this run of the transport. In this case, continue_more will be
2290 true, and all we should do is send RSET if necessary, and return, leaving the
2293 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2294 do not want to continue with other messages down the same channel, because that
2295 can lead to looping between two or more messages, all with the same,
2296 temporarily failing address(es). [The retry information isn't updated yet, so
2297 new processes keep on trying.] We probably also don't want to try more of this
2298 message's addresses either.
2300 If we have started a TLS session, we have to end it before passing the
2301 connection to a new process. However, not all servers can handle this (Exim
2302 can), so we do not pass such a connection on if the host matches
2303 hosts_nopass_tls. */
2306 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2307 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2308 continue_more, yield, (first_addr == NULL)? "":"not ");
2310 if (completed_address && ok && send_quit)
2313 if (first_addr != NULL || continue_more ||
2315 (tls_out.active < 0 ||
2316 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2317 host->address, NULL) != OK)
2319 transport_check_waiting(tblock->name, host->name,
2320 tblock->connection_max_messages, new_message_id, &more)
2328 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2330 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2331 host->address, strerror(save_errno));
2334 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2335 ob->command_timeout)))
2338 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2342 DEBUG(D_transport) debug_printf("%s\n", msg);
2347 /* Either RSET was not needed, or it succeeded */
2351 if (first_addr != NULL) /* More addresses still to be sent */
2352 { /* in this run of the transport */
2353 continue_sequence++; /* Causes * in logging */
2356 if (continue_more) return yield; /* More addresses for another run */
2358 /* Pass the socket to a new Exim process. Before doing so, we must shut
2359 down TLS. Not all MTAs allow for the continuation of the SMTP session
2360 when TLS is shut down. We test for this by sending a new EHLO. If we
2361 don't get a good response, we don't attempt to pass the socket on. */
2364 if (tls_out.active >= 0)
2366 tls_close(FALSE, TRUE);
2370 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2371 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2372 ob->command_timeout);
2376 /* If the socket is successfully passed, we musn't send QUIT (or
2377 indeed anything!) from here. */
2379 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2380 new_message_id, inblock.sock))
2386 /* If RSET failed and there are addresses left, they get deferred. */
2388 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2392 /* End off tidily with QUIT unless the connection has died or the socket has
2393 been passed to another process. There has been discussion on the net about what
2394 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2395 to wait for a response, but on the other hand, there isn't anything one can do
2396 with an error response, other than log it. Exim used to do that. However,
2397 further discussion suggested that it is positively advantageous not to wait for
2398 the response, but to close the session immediately. This is supposed to move
2399 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2400 load from the server. (Hosts that are both servers and clients may not see much
2401 difference, of course.) Further discussion indicated that this was safe to do
2402 on Unix systems which have decent implementations of TCP/IP that leave the
2403 connection around for a while (TIME_WAIT) after the application has gone away.
2404 This enables the response sent by the server to be properly ACKed rather than
2405 timed out, as can happen on broken TCP/IP implementations on other OS.
2407 This change is being made on 31-Jul-98. After over a year of trouble-free
2408 operation, the old commented-out code was removed on 17-Sep-99. */
2411 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2416 tls_close(FALSE, TRUE);
2419 /* Close the socket, and return the appropriate value, first setting
2420 continue_transport and continue_hostname NULL to prevent any other addresses
2421 that may include the host from trying to re-use a continuation socket. This
2422 works because the NULL setting is passed back to the calling process, and
2423 remote_max_parallel is forced to 1 when delivering over an existing connection,
2425 If all went well and continue_more is set, we shouldn't actually get here if
2426 there are further addresses, as the return above will be taken. However,
2427 writing RSET might have failed, or there may be other addresses whose hosts are
2428 specified in the transports, and therefore not visible at top level, in which
2429 case continue_more won't get set. */
2431 (void)close(inblock.sock);
2432 continue_transport = NULL;
2433 continue_hostname = NULL;
2440 /*************************************************
2441 * Closedown entry point *
2442 *************************************************/
2444 /* This function is called when exim is passed an open smtp channel
2445 from another incarnation, but the message which it has been asked
2446 to deliver no longer exists. The channel is on stdin.
2448 We might do fancy things like looking for another message to send down
2449 the channel, but if the one we sought has gone, it has probably been
2450 delivered by some other process that itself will seek further messages,
2451 so just close down our connection.
2453 Argument: pointer to the transport instance block
2458 smtp_transport_closedown(transport_instance *tblock)
2460 smtp_transport_options_block *ob =
2461 (smtp_transport_options_block *)(tblock->options_block);
2462 smtp_inblock inblock;
2463 smtp_outblock outblock;
2465 uschar inbuffer[4096];
2466 uschar outbuffer[16];
2468 inblock.sock = fileno(stdin);
2469 inblock.buffer = inbuffer;
2470 inblock.buffersize = sizeof(inbuffer);
2471 inblock.ptr = inbuffer;
2472 inblock.ptrend = inbuffer;
2474 outblock.sock = inblock.sock;
2475 outblock.buffersize = sizeof(outbuffer);
2476 outblock.buffer = outbuffer;
2477 outblock.ptr = outbuffer;
2478 outblock.cmd_count = 0;
2479 outblock.authenticating = FALSE;
2481 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2482 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2483 ob->command_timeout);
2484 (void)close(inblock.sock);
2489 /*************************************************
2490 * Prepare addresses for delivery *
2491 *************************************************/
2493 /* This function is called to flush out error settings from previous delivery
2494 attempts to other hosts. It also records whether we got here via an MX record
2495 or not in the more_errno field of the address. We are interested only in
2496 addresses that are still marked DEFER - others may have got delivered to a
2497 previously considered IP address. Set their status to PENDING_DEFER to indicate
2498 which ones are relevant this time.
2501 addrlist the list of addresses
2502 host the host we are delivering to
2504 Returns: the first address for this delivery
2507 static address_item *
2508 prepare_addresses(address_item *addrlist, host_item *host)
2510 address_item *first_addr = NULL;
2512 for (addr = addrlist; addr != NULL; addr = addr->next)
2514 if (addr->transport_return != DEFER) continue;
2515 if (first_addr == NULL) first_addr = addr;
2516 addr->transport_return = PENDING_DEFER;
2517 addr->basic_errno = 0;
2518 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2519 addr->message = NULL;
2521 addr->cipher = NULL;
2522 addr->peerdn = NULL;
2530 /*************************************************
2531 * Main entry point *
2532 *************************************************/
2534 /* See local README for interface details. As this is a remote transport, it is
2535 given a chain of addresses to be delivered in one connection, if possible. It
2536 always returns TRUE, indicating that each address has its own independent
2537 status set, except if there is a setting up problem, in which case it returns
2541 smtp_transport_entry(
2542 transport_instance *tblock, /* data for this instantiation */
2543 address_item *addrlist) /* addresses we are working on */
2547 int hosts_defer = 0;
2549 int hosts_looked_up = 0;
2550 int hosts_retry = 0;
2551 int hosts_serial = 0;
2552 int hosts_total = 0;
2553 int total_hosts_tried = 0;
2555 BOOL expired = TRUE;
2556 BOOL continuing = continue_hostname != NULL;
2557 uschar *expanded_hosts = NULL;
2559 uschar *tid = string_sprintf("%s transport", tblock->name);
2560 smtp_transport_options_block *ob =
2561 (smtp_transport_options_block *)(tblock->options_block);
2562 host_item *hostlist = addrlist->host_list;
2563 host_item *host = NULL;
2567 debug_printf("%s transport entered\n", tblock->name);
2568 for (addr = addrlist; addr != NULL; addr = addr->next)
2569 debug_printf(" %s\n", addr->address);
2570 if (continuing) debug_printf("already connected to %s [%s]\n",
2571 continue_hostname, continue_host_address);
2574 /* Set the flag requesting that these hosts be added to the waiting
2575 database if the delivery fails temporarily or if we are running with
2576 queue_smtp or a 2-stage queue run. This gets unset for certain
2577 kinds of error, typically those that are specific to the message. */
2579 update_waiting = TRUE;
2581 /* If a host list is not defined for the addresses - they must all have the
2582 same one in order to be passed to a single transport - or if the transport has
2583 a host list with hosts_override set, use the host list supplied with the
2584 transport. It is an error for this not to exist. */
2586 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2588 if (ob->hosts == NULL)
2590 addrlist->message = string_sprintf("%s transport called with no hosts set",
2592 addrlist->transport_return = PANIC;
2593 return FALSE; /* Only top address has status */
2596 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2599 /* If the transport's host list contains no '$' characters, and we are not
2600 randomizing, it is fixed and therefore a chain of hosts can be built once
2601 and for all, and remembered for subsequent use by other calls to this
2602 transport. If, on the other hand, the host list does contain '$', or we are
2603 randomizing its order, we have to rebuild it each time. In the fixed case,
2604 as the hosts string will never be used again, it doesn't matter that we
2605 replace all the : characters with zeros. */
2607 if (ob->hostlist == NULL)
2609 uschar *s = ob->hosts;
2611 if (Ustrchr(s, '$') != NULL)
2613 expanded_hosts = expand_string(s);
2614 if (expanded_hosts == NULL)
2616 addrlist->message = string_sprintf("failed to expand list of hosts "
2617 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2618 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2619 return FALSE; /* Only top address has status */
2621 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2622 "\"%s\"\n", s, expanded_hosts);
2626 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2628 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2630 /* Check that the expansion yielded something useful. */
2631 if (hostlist == NULL)
2634 string_sprintf("%s transport has empty hosts setting", tblock->name);
2635 addrlist->transport_return = PANIC;
2636 return FALSE; /* Only top address has status */
2639 /* If there was no expansion of hosts, save the host list for
2642 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2645 /* This is not the first time this transport has been run in this delivery;
2646 the host list was built previously. */
2648 else hostlist = ob->hostlist;
2651 /* The host list was supplied with the address. If hosts_randomize is set, we
2652 must sort it into a random order if it did not come from MX records and has not
2653 already been randomized (but don't bother if continuing down an existing
2656 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2658 host_item *newlist = NULL;
2659 while (hostlist != NULL)
2661 host_item *h = hostlist;
2662 hostlist = hostlist->next;
2664 h->sort_key = random_number(100);
2666 if (newlist == NULL)
2671 else if (h->sort_key < newlist->sort_key)
2678 host_item *hh = newlist;
2679 while (hh->next != NULL)
2681 if (h->sort_key < hh->next->sort_key) break;
2689 hostlist = addrlist->host_list = newlist;
2693 /* Sort out the default port. */
2695 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2698 /* For each host-plus-IP-address on the list:
2700 . If this is a continued delivery and the host isn't the one with the
2701 current connection, skip.
2703 . If the status is unusable (i.e. previously failed or retry checked), skip.
2705 . If no IP address set, get the address, either by turning the name into
2706 an address, calling gethostbyname if gethostbyname is on, or by calling
2707 the DNS. The DNS may yield multiple addresses, in which case insert the
2708 extra ones into the list.
2710 . Get the retry data if not previously obtained for this address and set the
2711 field which remembers the state of this address. Skip if the retry time is
2712 not reached. If not, remember whether retry data was found. The retry string
2713 contains both the name and the IP address.
2715 . Scan the list of addresses and mark those whose status is DEFER as
2716 PENDING_DEFER. These are the only ones that will be processed in this cycle
2719 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2720 Some addresses may be successfully delivered, others may fail, and yet
2721 others may get temporary errors and so get marked DEFER.
2723 . The return from the delivery attempt is OK if a connection was made and a
2724 valid SMTP dialogue was completed. Otherwise it is DEFER.
2726 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2728 . If fail to connect, or other defer state, add a retry item.
2730 . If there are any addresses whose status is still DEFER, carry on to the
2731 next host/IPaddress, unless we have tried the number of hosts given
2732 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2733 there is some fancy logic for hosts_max_try that means its limit can be
2734 overstepped in some circumstances.
2736 If we get to the end of the list, all hosts have deferred at least one address,
2737 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2738 delivery attempt to those hosts whose last try was before the arrival time of
2739 the current message. To cope with this, we have to go round the loop a second
2740 time. After that, set the status and error data for any addresses that haven't
2741 had it set already. */
2743 for (cutoff_retry = 0; expired &&
2744 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2747 host_item *nexthost = NULL;
2748 int unexpired_hosts_tried = 0;
2750 for (host = hostlist;
2752 unexpired_hosts_tried < ob->hosts_max_try &&
2753 total_hosts_tried < ob->hosts_max_try_hardlimit;
2759 BOOL serialized = FALSE;
2760 BOOL host_is_expired = FALSE;
2761 BOOL message_defer = FALSE;
2762 BOOL ifchanges = FALSE;
2763 BOOL some_deferred = FALSE;
2764 address_item *first_addr = NULL;
2765 uschar *interface = NULL;
2766 uschar *retry_host_key = NULL;
2767 uschar *retry_message_key = NULL;
2768 uschar *serialize_key = NULL;
2770 /* Default next host is next host. :-) But this can vary if the
2771 hosts_max_try limit is hit (see below). It may also be reset if a host
2772 address is looked up here (in case the host was multihomed). */
2774 nexthost = host->next;
2776 /* If the address hasn't yet been obtained from the host name, look it up
2777 now, unless the host is already marked as unusable. If it is marked as
2778 unusable, it means that the router was unable to find its IP address (in
2779 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2780 the lookup failed last time. We don't get this far if *all* MX records
2781 point to non-existent hosts; that is treated as a hard error.
2783 We can just skip this host entirely. When the hosts came from the router,
2784 the address will timeout based on the other host(s); when the address is
2785 looked up below, there is an explicit retry record added.
2787 Note that we mustn't skip unusable hosts if the address is not unset; they
2788 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2790 if (host->address == NULL)
2792 int new_port, flags;
2794 uschar *canonical_name;
2796 if (host->status >= hstatus_unusable)
2798 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2803 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2805 /* The host name is permitted to have an attached port. Find it, and
2806 strip it from the name. Just remember it for now. */
2808 new_port = host_item_get_port(host);
2810 /* Count hosts looked up */
2814 /* Find by name if so configured, or if it's an IP address. We don't
2815 just copy the IP address, because we need the test-for-local to happen. */
2817 flags = HOST_FIND_BY_A;
2818 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2819 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2821 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2822 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2824 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2825 ob->dnssec_request_domains, ob->dnssec_require_domains,
2826 &canonical_name, NULL);
2828 /* Update the host (and any additional blocks, resulting from
2829 multihoming) with a host-specific port, if any. */
2831 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2833 /* Failure to find the host at this time (usually DNS temporary failure)
2834 is really a kind of routing failure rather than a transport failure.
2835 Therefore we add a retry item of the routing kind, not to stop us trying
2836 to look this name up here again, but to ensure the address gets timed
2837 out if the failures go on long enough. A complete failure at this point
2838 commonly points to a configuration error, but the best action is still
2839 to carry on for the next host. */
2841 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2843 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2845 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2846 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2847 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2848 host->status = hstatus_unusable;
2850 for (addr = addrlist; addr != NULL; addr = addr->next)
2852 if (addr->transport_return != DEFER) continue;
2853 addr->basic_errno = ERRNO_UNKNOWNHOST;
2855 string_sprintf("failed to lookup IP address for %s", host->name);
2860 /* If the host is actually the local host, we may have a problem, or
2861 there may be some cunning configuration going on. In the problem case,
2862 log things and give up. The default transport status is already DEFER. */
2864 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2866 for (addr = addrlist; addr != NULL; addr = addr->next)
2868 addr->basic_errno = 0;
2869 addr->message = string_sprintf("%s transport found host %s to be "
2870 "local", tblock->name, host->name);
2874 } /* End of block for IP address lookup */
2876 /* If this is a continued delivery, we are interested only in the host
2877 which matches the name of the existing open channel. The check is put
2878 here after the local host lookup, in case the name gets expanded as a
2879 result of the lookup. Set expired FALSE, to save the outer loop executing
2882 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2883 Ustrcmp(continue_host_address, host->address) != 0))
2886 continue; /* With next host */
2889 /* Reset the default next host in case a multihomed host whose addresses
2890 are not looked up till just above added to the host list. */
2892 nexthost = host->next;
2894 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2895 domain is in queue_smtp_domains, we don't actually want to attempt any
2896 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2897 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2898 were not in it. We don't want to hold up all SMTP deliveries! Except when
2899 doing a two-stage queue run, don't do this if forcing. */
2901 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2902 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2903 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2906 for (addr = addrlist; addr != NULL; addr = addr->next)
2908 if (addr->transport_return != DEFER) continue;
2909 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2911 continue; /* With next host */
2914 /* Count hosts being considered - purely for an intelligent comment
2915 if none are usable. */
2919 /* Set $host and $host address now in case they are needed for the
2920 interface expansion or the serialize_hosts check; they remain set if an
2921 actual delivery happens. */
2923 deliver_host = host->name;
2924 deliver_host_address = host->address;
2926 /* Set up a string for adding to the retry key if the port number is not
2927 the standard SMTP port. A host may have its own port setting that overrides
2930 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2932 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2934 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2935 string changes upon expansion, we must add it to the key that is used for
2936 retries, because connections to the same host from a different interface
2937 should be treated separately. */
2939 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2940 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2943 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2945 /* The first time round the outer loop, check the status of the host by
2946 inspecting the retry data. The second time round, we are interested only
2947 in expired hosts that haven't been tried since this message arrived. */
2949 if (cutoff_retry == 0)
2951 /* Ensure the status of the address is set by checking retry data if
2952 necessary. There maybe host-specific retry data (applicable to all
2953 messages) and also data for retries of a specific message at this host.
2954 If either of these retry records are actually read, the keys used are
2955 returned to save recomputing them later. */
2957 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2958 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2960 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2961 (host->address == NULL)? US"" : host->address, pistring,
2962 (host->status == hstatus_usable)? "usable" :
2963 (host->status == hstatus_unusable)? "unusable" :
2964 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2966 /* Skip this address if not usable at this time, noting if it wasn't
2967 actually expired, both locally and in the address. */
2969 switch (host->status)
2971 case hstatus_unusable:
2973 setflag(addrlist, af_retry_skipped);
2976 case hstatus_unusable_expired:
2979 case hwhy_retry: hosts_retry++; break;
2980 case hwhy_failed: hosts_fail++; break;
2981 case hwhy_deferred: hosts_defer++; break;
2984 /* If there was a retry message key, implying that previously there
2985 was a message-specific defer, we don't want to update the list of
2986 messages waiting for these hosts. */
2988 if (retry_message_key != NULL) update_waiting = FALSE;
2989 continue; /* With the next host or IP address */
2993 /* Second time round the loop: if the address is set but expired, and
2994 the message is newer than the last try, let it through. */
2998 if (host->address == NULL ||
2999 host->status != hstatus_unusable_expired ||
3000 host->last_try > received_time)
3003 debug_printf("trying expired host %s [%s]%s\n",
3004 host->name, host->address, pistring);
3005 host_is_expired = TRUE;
3008 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3009 it remains TRUE only if all hosts are expired and none are actually tried.
3014 /* If this host is listed as one to which access must be serialized,
3015 see if another Exim process has a connection to it, and if so, skip
3016 this host. If not, update the database to record our connection to it
3017 and remember this for later deletion. Do not do any of this if we are
3018 sending the message down a pre-existing connection. */
3021 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3022 host->address, NULL) == OK)
3024 serialize_key = string_sprintf("host-serialize-%s", host->name);
3025 if (!enq_start(serialize_key))
3028 debug_printf("skipping host %s because another Exim process "
3029 "is connected to it\n", host->name);
3036 /* OK, we have an IP address that is not waiting for its retry time to
3037 arrive (it might be expired) OR (second time round the loop) we have an
3038 expired host that hasn't been tried since the message arrived. Have a go
3039 at delivering the message to it. First prepare the addresses by flushing
3040 out the result of previous attempts, and finding the first address that
3041 is still to be delivered. */
3043 first_addr = prepare_addresses(addrlist, host);
3045 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3046 message_id, host->name, host->address, addrlist->address,
3047 (addrlist->next == NULL)? "" : ", ...");
3049 set_process_info("delivering %s to %s [%s] (%s%s)",
3050 message_id, host->name, host->address, addrlist->address,
3051 (addrlist->next == NULL)? "" : ", ...");
3053 /* This is not for real; don't do the delivery. If there are
3054 any remaining hosts, list them. */
3059 set_errno(addrlist, 0, NULL, OK, FALSE);
3060 for (addr = addrlist; addr != NULL; addr = addr->next)
3062 addr->host_used = host;
3063 addr->special_action = '*';
3064 addr->message = US"delivery bypassed by -N option";
3068 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3069 "*** host and remaining hosts:\n", tblock->name);
3070 for (host2 = host; host2 != NULL; host2 = host2->next)
3071 debug_printf(" %s [%s]\n", host2->name,
3072 (host2->address == NULL)? US"unset" : host2->address);
3077 /* This is for real. If the host is expired, we don't count it for
3078 hosts_max_retry. This ensures that all hosts must expire before an address
3079 is timed out, unless hosts_max_try_hardlimit (which protects against
3080 lunatic DNS configurations) is reached.
3082 If the host is not expired and we are about to hit the hosts_max_retry
3083 limit, check to see if there is a subsequent hosts with a different MX
3084 value. If so, make that the next host, and don't count this one. This is a
3085 heuristic to make sure that different MXs do get tried. With a normal kind
3086 of retry rule, they would get tried anyway when the earlier hosts were
3087 delayed, but if the domain has a "retry every time" type of rule - as is
3088 often used for the the very large ISPs, that won't happen. */
3092 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3096 debug_printf("hosts_max_try limit reached with this host\n");
3097 for (h = host; h != NULL; h = h->next)
3098 if (h->mx != host->mx) break;
3102 unexpired_hosts_tried--;
3103 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3104 "and will be tried\n");
3108 /* Attempt the delivery. */
3110 total_hosts_tried++;
3111 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3112 expanded_hosts != NULL, &message_defer, FALSE);
3115 OK => connection made, each address contains its result;
3116 message_defer is set for message-specific defers (when all
3117 recipients are marked defer)
3118 DEFER => there was a non-message-specific delivery problem;
3119 ERROR => there was a problem setting up the arguments for a filter,
3120 or there was a problem with expanding added headers
3123 /* If the result is not OK, there was a non-message-specific problem.
3124 If the result is DEFER, we need to write to the logs saying what happened
3125 for this particular host, except in the case of authentication and TLS
3126 failures, where the log has already been written. If all hosts defer a
3127 general message is written at the end. */
3129 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3130 first_addr->basic_errno != ERRNO_TLSFAILURE)
3131 write_logs(first_addr, host);
3133 #ifdef EXPERIMENTAL_TPDA
3135 tpda_deferred(ob, first_addr, host);
3138 /* If STARTTLS was accepted, but there was a failure in setting up the
3139 TLS session (usually a certificate screwup), and the host is not in
3140 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3141 TLS forcibly turned off. We have to start from scratch with a new SMTP
3142 connection. That's why the retry is done from here, not from within
3143 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3144 session, so the in-clear transmission after those errors, if permitted,
3145 happens inside smtp_deliver().] */
3148 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3149 ob->tls_tempfail_tryclear &&
3150 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3151 host->address, NULL) != OK)
3153 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3154 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3155 first_addr = prepare_addresses(addrlist, host);
3156 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3157 expanded_hosts != NULL, &message_defer, TRUE);
3158 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3159 write_logs(first_addr, host);
3160 #ifdef EXPERIMENTAL_TPDA
3162 tpda_deferred(ob, first_addr, host);
3168 /* Delivery attempt finished */
3170 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3173 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3174 message_id, host->name, host->address, addrlist->address,
3175 (addrlist->next == NULL)? "" : " (& others)", rs);
3177 /* Release serialization if set up */
3179 if (serialized) enq_end(serialize_key);
3181 /* If the result is DEFER, or if a host retry record is known to exist, we
3182 need to add an item to the retry chain for updating the retry database
3183 at the end of delivery. We only need to add the item to the top address,
3184 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3185 for any other delivery attempts using the same address. (It is copied into
3186 the unusable tree at the outer level, so even if different address blocks
3187 contain the same address, it still won't get tried again.) */
3189 if (rc == DEFER || retry_host_key != NULL)
3191 int delete_flag = (rc != DEFER)? rf_delete : 0;
3192 if (retry_host_key == NULL)
3194 retry_host_key = ob->retry_include_ip_address?
3195 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3196 string_sprintf("T:%S%s", host->name, pistring);
3199 /* If a delivery of another message over an existing SMTP connection
3200 yields DEFER, we do NOT set up retry data for the host. This covers the
3201 case when there are delays in routing the addresses in the second message
3202 that are so long that the server times out. This is alleviated by not
3203 routing addresses that previously had routing defers when handling an
3204 existing connection, but even so, this case may occur (e.g. if a
3205 previously happily routed address starts giving routing defers). If the
3206 host is genuinely down, another non-continued message delivery will
3207 notice it soon enough. */
3209 if (delete_flag != 0 || !continuing)
3210 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3212 /* We may have tried an expired host, if its retry time has come; ensure
3213 the status reflects the expiry for the benefit of any other addresses. */
3217 host->status = (host_is_expired)?
3218 hstatus_unusable_expired : hstatus_unusable;
3219 host->why = hwhy_deferred;
3223 /* If message_defer is set (host was OK, but every recipient got deferred
3224 because of some message-specific problem), or if that had happened
3225 previously so that a message retry key exists, add an appropriate item
3226 to the retry chain. Note that if there was a message defer but now there is
3227 a host defer, the message defer record gets deleted. That seems perfectly
3228 reasonable. Also, stop the message from being remembered as waiting
3229 for specific hosts. */
3231 if (message_defer || retry_message_key != NULL)
3233 int delete_flag = message_defer? 0 : rf_delete;
3234 if (retry_message_key == NULL)
3236 retry_message_key = ob->retry_include_ip_address?
3237 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3239 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3241 retry_add_item(addrlist, retry_message_key,
3242 rf_message | rf_host | delete_flag);
3243 update_waiting = FALSE;
3246 /* Any return other than DEFER (that is, OK or ERROR) means that the
3247 addresses have got their final statuses filled in for this host. In the OK
3248 case, see if any of them are deferred. */
3252 for (addr = addrlist; addr != NULL; addr = addr->next)
3254 if (addr->transport_return == DEFER)
3256 some_deferred = TRUE;
3262 /* If no addresses deferred or the result was ERROR, return. We do this for
3263 ERROR because a failing filter set-up or add_headers expansion is likely to
3264 fail for any host we try. */
3266 if (rc == ERROR || (rc == OK && !some_deferred))
3268 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3269 return TRUE; /* Each address has its status */
3272 /* If the result was DEFER or some individual addresses deferred, let
3273 the loop run to try other hosts with the deferred addresses, except for the
3274 case when we were trying to deliver down an existing channel and failed.
3275 Don't try any other hosts in this case. */
3277 if (continuing) break;
3279 /* If the whole delivery, or some individual addresses, were deferred and
3280 there are more hosts that could be tried, do not count this host towards
3281 the hosts_max_try limit if the age of the message is greater than the
3282 maximum retry time for this host. This means we may try try all hosts,
3283 ignoring the limit, when messages have been around for some time. This is
3284 important because if we don't try all hosts, the address will never time
3285 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3287 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3290 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3292 if (retry != NULL && retry->rules != NULL)
3294 retry_rule *last_rule;
3295 for (last_rule = retry->rules;
3296 last_rule->next != NULL;
3297 last_rule = last_rule->next);
3298 timedout = time(NULL) - received_time > last_rule->timeout;
3300 else timedout = TRUE; /* No rule => timed out */
3304 unexpired_hosts_tried--;
3305 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3306 "hosts_max_try (message older than host's retry time)\n");
3309 } /* End of loop for trying multiple hosts. */
3311 /* This is the end of the loop that repeats iff expired is TRUE and
3312 ob->delay_after_cutoff is FALSE. The second time round we will
3313 try those hosts that haven't been tried since the message arrived. */
3317 debug_printf("all IP addresses skipped or deferred at least one address\n");
3318 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3319 debug_printf("retrying IP addresses not tried since message arrived\n");
3324 /* Get here if all IP addresses are skipped or defer at least one address. In
3325 MUA wrapper mode, this will happen only for connection or other non-message-
3326 specific failures. Force the delivery status for all addresses to FAIL. */
3330 for (addr = addrlist; addr != NULL; addr = addr->next)
3331 addr->transport_return = FAIL;
3335 /* In the normal, non-wrapper case, add a standard message to each deferred
3336 address if there hasn't been an error, that is, if it hasn't actually been
3337 tried this time. The variable "expired" will be FALSE if any deliveries were
3338 actually tried, or if there was at least one host that was not expired. That
3339 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3340 a delivery has been tried, an error code will be set, and the failing of the
3341 message is handled by the retry code later.
3343 If queue_smtp is set, or this transport was called to send a subsequent message
3344 down an existing TCP/IP connection, and something caused the host not to be
3345 found, we end up here, but can detect these cases and handle them specially. */
3347 for (addr = addrlist; addr != NULL; addr = addr->next)
3349 /* If host is not NULL, it means that we stopped processing the host list
3350 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3351 means we need to behave as if some hosts were skipped because their retry
3352 time had not come. Specifically, this prevents the address from timing out.
3353 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3354 hosts were tried. */
3358 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3361 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3362 "hosts were tried\n");
3367 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3368 setflag(addr, af_retry_skipped);
3372 if (queue_smtp) /* no deliveries attempted */
3374 addr->transport_return = DEFER;
3375 addr->basic_errno = 0;
3376 addr->message = US"SMTP delivery explicitly queued";
3379 else if (addr->transport_return == DEFER &&
3380 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3381 addr->message == NULL)
3383 addr->basic_errno = ERRNO_HRETRY;
3384 if (continue_hostname != NULL)
3386 addr->message = US"no host found for existing SMTP connection";
3390 setflag(addr, af_pass_message); /* This is not a security risk */
3391 addr->message = (ob->delay_after_cutoff)?
3392 US"retry time not reached for any host after a long failure period" :
3393 US"all hosts have been failing for a long time and were last tried "
3394 "after this message arrived";
3396 /* If we are already using fallback hosts, or there are no fallback hosts
3397 defined, convert the result to FAIL to cause a bounce. */
3399 if (addr->host_list == addr->fallback_hosts ||
3400 addr->fallback_hosts == NULL)
3401 addr->transport_return = FAIL;
3405 if (hosts_retry == hosts_total)
3406 addr->message = US"retry time not reached for any host";
3407 else if (hosts_fail == hosts_total)
3408 addr->message = US"all host address lookups failed permanently";
3409 else if (hosts_defer == hosts_total)
3410 addr->message = US"all host address lookups failed temporarily";
3411 else if (hosts_serial == hosts_total)
3412 addr->message = US"connection limit reached for all hosts";
3413 else if (hosts_fail+hosts_defer == hosts_total)
3414 addr->message = US"all host address lookups failed";
3415 else addr->message = US"some host address lookups failed and retry time "
3416 "not reached for other hosts or connection limit reached";
3421 /* Update the database which keeps information about which messages are waiting
3422 for which hosts to become available. For some message-specific errors, the
3423 update_waiting flag is turned off because we don't want follow-on deliveries in
3424 those cases. If this transport instance is explicitly limited to one message
3425 per connection then follow-on deliveries are not possible and there's no need
3426 to create/update the per-transport wait-<transport_name> database. */
3428 if (update_waiting && tblock->connection_max_messages != 1)
3429 transport_update_waiting(hostlist, tblock->name);
3433 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3435 return TRUE; /* Each address has its status */
3440 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob