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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15
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. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 US"*", /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 NULL, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
250 FALSE, /* lmtp_ignore_quota */
251 NULL, /* expand_retry_include_ip_address */
252 TRUE /* retry_include_ip_address */
253 #ifdef EXPERIMENTAL_SOCKS
254 #endif
255 ,NULL /* socks_proxy */
256 #ifdef SUPPORT_TLS
257 ,NULL, /* tls_certificate */
258 NULL, /* tls_crl */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
264 NULL, /* tls_sni */
265 US"system", /* tls_verify_certificates */
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
270 US"*", /* tls_try_verify_hosts */
271 US"*" /* tls_verify_cert_hostnames */
272 #endif
273 #ifndef DISABLE_DKIM
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
280 #endif
281 };
282
283 /* some DSN flags for use later */
284
285 static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
287
288 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
289
290
291
292 /* Local statics */
293
294 static uschar *smtp_command; /* Points to last cmd for error messages */
295 static uschar *mail_command; /* Points to MAIL cmd for error messages */
296 static BOOL update_waiting; /* TRUE to update the "wait" database */
297
298
299 /*************************************************
300 * Setup entry point *
301 *************************************************/
302
303 /* This function is called when the transport is about to be used,
304 but before running it in a sub-process. It is used for two things:
305
306 (1) To set the fallback host list in addresses, when delivering.
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
309
310 Arguments:
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
316 errmsg place for error message (not used)
317
318 Returns: OK always (FAIL, DEFER not used)
319 */
320
321 static int
322 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 {
325 smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
327
328 errmsg = errmsg; /* Keep picky compilers happy */
329 uid = uid;
330 gid = gid;
331
332 /* Pass back options if required. This interface is getting very messy. */
333
334 if (tf != NULL)
335 {
336 tf->interface = ob->interface;
337 tf->port = ob->port;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
345 tf->helo_data = ob->helo_data;
346 }
347
348 /* Set the fallback host list for all the addresses that don't have fallback
349 host lists, provided that the local host wasn't present in the original host
350 list. */
351
352 if (!testflag(addrlist, af_local_host_removed))
353 {
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
357 }
358
359 return OK;
360 }
361
362
363
364 /*************************************************
365 * Initialization entry point *
366 *************************************************/
367
368 /* Called for each instance, after its options have been read, to
369 enable consistency checks to be done, or anything else that needs
370 to be set up.
371
372 Argument: pointer to the transport instance block
373 Returns: nothing
374 */
375
376 void
377 smtp_transport_init(transport_instance *tblock)
378 {
379 smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
381
382 /* Retry_use_local_part defaults FALSE if unset */
383
384 if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
386
387 /* Set the default port according to the protocol */
388
389 if (ob->port == NULL)
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392
393 /* Set up the setup entry point, to be called before subprocesses for this
394 transport. */
395
396 tblock->setup = smtp_transport_setup;
397
398 /* Complain if any of the timeouts are zero. */
399
400 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
404 tblock->name);
405
406 /* If hosts_override is set and there are local hosts, set the global
407 flag that stops verify from showing router hosts. */
408
409 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410
411 /* If there are any fallback hosts listed, build a chain of host items
412 for them, but do not do any lookups at this time. */
413
414 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
415
416 #ifdef SUPPORT_TLS
417 if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
422 " are obsolete\n");
423 #endif
424 }
425
426
427
428
429
430 /*************************************************
431 * Set delivery info into all active addresses *
432 *************************************************/
433
434 /* Only addresses whose status is >= PENDING are relevant. A lesser
435 status means that an address is not currently being processed.
436
437 Arguments:
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
443 host if set, mark addrs as having used this host
444
445 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447 this particular type of timeout.
448
449 Returns: nothing
450 */
451
452 static void
453 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
454 BOOL pass_message, host_item * host)
455 {
456 address_item *addr;
457 int orvalue = 0;
458 if (errno_value == ERRNO_CONNECTTIMEOUT)
459 {
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
462 }
463 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return >= PENDING)
465 {
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
468 if (msg != NULL)
469 {
470 addr->message = msg;
471 if (pass_message) setflag(addr, af_pass_message);
472 }
473 addr->transport_return = rc;
474 if (host)
475 addr->host_used = host;
476 }
477 }
478
479
480
481 /*************************************************
482 * Check an SMTP response *
483 *************************************************/
484
485 /* This function is given an errno code and the SMTP response buffer
486 to analyse, together with the host identification for generating messages. It
487 sets an appropriate message and puts the first digit of the response code into
488 the yield variable. If no response was actually read, a suitable digit is
489 chosen.
490
491 Arguments:
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
499
500 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 */
502
503 static BOOL
504 check_response(host_item *host, int *errno_value, int more_errno,
505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
506 {
507 uschar *pl = US"";
508
509 if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
513 pl = US"pipelined ";
514
515 *yield = '4'; /* Default setting is to give a temporary error */
516
517 /* Handle response timeout */
518
519 if (*errno_value == ETIMEDOUT)
520 {
521 *message = US string_sprintf("SMTP timeout after %s%s",
522 pl, smtp_command);
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
525 transport_count);
526 return FALSE;
527 }
528
529 /* Handle malformed SMTP response */
530
531 if (*errno_value == ERRNO_SMTPFORMAT)
532 {
533 const uschar *malfresp = string_printing(buffer);
534 while (isspace(*malfresp)) malfresp++;
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
540 return FALSE;
541 }
542
543 /* Handle a failed filter process error; can't send QUIT as we mustn't
544 end the DATA. */
545
546 if (*errno_value == ERRNO_FILTER_FAIL)
547 {
548 *message = US string_sprintf("transport filter process failed (%d)%s",
549 more_errno,
550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
551 return FALSE;
552 }
553
554 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
555 end the DATA. */
556
557 if (*errno_value == ERRNO_CHHEADER_FAIL)
558 {
559 *message =
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
562 return FALSE;
563 }
564
565 /* Handle failure to write a complete data block */
566
567 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 {
569 *message = US string_sprintf("failed to write a data block");
570 return FALSE;
571 }
572
573 /* Handle error responses from the remote mailer. */
574
575 if (buffer[0] != 0)
576 {
577 const uschar *s = string_printing(buffer);
578 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
579 "%s", pl, smtp_command, s);
580 *pass_message = TRUE;
581 *yield = buffer[0];
582 return TRUE;
583 }
584
585 /* No data was read. If there is no errno, this must be the EOF (i.e.
586 connection closed) case, which causes deferral. An explicit connection reset
587 error has the same effect. Otherwise, put the host's identity in the message,
588 leaving the errno value to be interpreted as well. In all cases, we have to
589 assume the connection is now dead. */
590
591 if (*errno_value == 0 || *errno_value == ECONNRESET)
592 {
593 *errno_value = ERRNO_SMTPCLOSED;
594 *message = US string_sprintf("Remote host closed connection "
595 "in response to %s%s", pl, smtp_command);
596 }
597 else *message = US string_sprintf("%s [%s]", host->name, host->address);
598
599 return FALSE;
600 }
601
602
603
604 /*************************************************
605 * Write error message to logs *
606 *************************************************/
607
608 /* This writes to the main log and to the message log.
609
610 Arguments:
611 addr the address item containing error information
612 host the current host
613
614 Returns: nothing
615 */
616
617 static void
618 write_logs(address_item *addr, host_item *host)
619 {
620 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
621
622 if (addr->message)
623 {
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630 else
631 {
632 if (log_extra_selector & LX_outgoing_port)
633 message = string_sprintf("%s:%d", message,
634 host->port == PORT_NONE ? 25 : host->port);
635 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
636 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
637 strerror(addr->basic_errno));
638 }
639 }
640
641 static void
642 msglog_line(host_item * host, uschar * message)
643 {
644 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
645 host->name, host->address, message);
646 }
647
648
649
650 #ifdef EXPERIMENTAL_EVENT
651 /*************************************************
652 * Post-defer action *
653 *************************************************/
654
655 /* This expands an arbitrary per-transport string.
656 It might, for example, be used to write to the database log.
657
658 Arguments:
659 addr the address item containing error information
660 host the current host
661
662 Returns: nothing
663 */
664
665 static void
666 deferred_event_raise(address_item *addr, host_item *host)
667 {
668 uschar * action = addr->transport->event_action;
669 const uschar * save_domain;
670 uschar * save_local;
671
672 if (!action)
673 return;
674
675 save_domain = deliver_domain;
676 save_local = deliver_localpart;
677
678 /*XXX would ip & port already be set up? */
679 deliver_host_address = string_copy(host->address);
680 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
681 event_defer_errno = addr->basic_errno;
682
683 router_name = addr->router->name;
684 transport_name = addr->transport->name;
685 deliver_domain = addr->domain;
686 deliver_localpart = addr->local_part;
687
688 (void) event_raise(action, US"msg:host:defer",
689 addr->message
690 ? addr->basic_errno > 0
691 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
692 : string_copy(addr->message)
693 : addr->basic_errno > 0
694 ? string_copy(US strerror(addr->basic_errno))
695 : NULL);
696
697 deliver_localpart = save_local;
698 deliver_domain = save_domain;
699 router_name = transport_name = NULL;
700 }
701 #endif
702
703 /*************************************************
704 * Synchronize SMTP responses *
705 *************************************************/
706
707 /* This function is called from smtp_deliver() to receive SMTP responses from
708 the server, and match them up with the commands to which they relate. When
709 PIPELINING is not in use, this function is called after every command, and is
710 therefore somewhat over-engineered, but it is simpler to use a single scheme
711 that works both with and without PIPELINING instead of having two separate sets
712 of code.
713
714 The set of commands that are buffered up with pipelining may start with MAIL
715 and may end with DATA; in between are RCPT commands that correspond to the
716 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
717 etc.) are never buffered.
718
719 Errors after MAIL or DATA abort the whole process leaving the response in the
720 buffer. After MAIL, pending responses are flushed, and the original command is
721 re-instated in big_buffer for error messages. For RCPT commands, the remote is
722 permitted to reject some recipient addresses while accepting others. However
723 certain errors clearly abort the whole process. Set the value in
724 transport_return to PENDING_OK if the address is accepted. If there is a
725 subsequent general error, it will get reset accordingly. If not, it will get
726 converted to OK at the end.
727
728 Arguments:
729 addrlist the complete address list
730 include_affixes TRUE if affixes include in RCPT
731 sync_addr ptr to the ptr of the one to start scanning at (updated)
732 host the host we are connected to
733 count the number of responses to read
734 address_retry_
735 include_sender true if 4xx retry is to include the sender it its key
736 pending_MAIL true if the first response is for MAIL
737 pending_DATA 0 if last command sent was not DATA
738 +1 if previously had a good recipient
739 -1 if not previously had a good recipient
740 inblock incoming SMTP block
741 timeout timeout value
742 buffer buffer for reading response
743 buffsize size of buffer
744
745 Returns: 3 if at least one address had 2xx and one had 5xx
746 2 if at least one address had 5xx but none had 2xx
747 1 if at least one host had a 2xx response, but none had 5xx
748 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
749 -1 timeout while reading RCPT response
750 -2 I/O or other non-response error for RCPT
751 -3 DATA or MAIL failed - errno and buffer set
752 */
753
754 static int
755 sync_responses(address_item *addrlist, BOOL include_affixes,
756 address_item **sync_addr, host_item *host, int count,
757 BOOL address_retry_include_sender, BOOL pending_MAIL,
758 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
759 int buffsize)
760 {
761 address_item *addr = *sync_addr;
762 int yield = 0;
763
764 /* Handle the response for a MAIL command. On error, reinstate the original
765 command in big_buffer for error message use, and flush any further pending
766 responses before returning, except after I/O errors and timeouts. */
767
768 if (pending_MAIL)
769 {
770 count--;
771 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
772 {
773 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
774 if (errno == 0 && buffer[0] != 0)
775 {
776 uschar flushbuffer[4096];
777 int save_errno = 0;
778 if (buffer[0] == '4')
779 {
780 save_errno = ERRNO_MAIL4XX;
781 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
782 }
783 while (count-- > 0)
784 {
785 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
786 '2', timeout)
787 && (errno != 0 || flushbuffer[0] == 0))
788 break;
789 }
790 errno = save_errno;
791 }
792
793 if (pending_DATA) count--; /* Number of RCPT responses to come */
794 while (count-- > 0) /* Mark any pending addrs with the host used */
795 {
796 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
797 addr->host_used = host;
798 addr = addr->next;
799 }
800 return -3;
801 }
802 }
803
804 if (pending_DATA) count--; /* Number of RCPT responses to come */
805
806 /* Read and handle the required number of RCPT responses, matching each one up
807 with an address by scanning for the next address whose status is PENDING_DEFER.
808 */
809
810 while (count-- > 0)
811 {
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813
814 /* The address was accepted */
815 addr->host_used = host;
816
817 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
818 {
819 yield |= 1;
820 addr->transport_return = PENDING_OK;
821
822 /* If af_dr_retry_exists is set, there was a routing delay on this address;
823 ensure that any address-specific retry record is expunged. We do this both
824 for the basic key and for the version that also includes the sender. */
825
826 if (testflag(addr, af_dr_retry_exists))
827 {
828 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
829 sender_address);
830 retry_add_item(addr, altkey, rf_delete);
831 retry_add_item(addr, addr->address_retry_key, rf_delete);
832 }
833 }
834
835 /* Timeout while reading the response */
836
837 else if (errno == ETIMEDOUT)
838 {
839 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
840 transport_rcpt_address(addr, include_affixes));
841 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
842 retry_add_item(addr, addr->address_retry_key, 0);
843 update_waiting = FALSE;
844 return -1;
845 }
846
847 /* Handle other errors in obtaining an SMTP response by returning -1. This
848 will cause all the addresses to be deferred. Restore the SMTP command in
849 big_buffer for which we are checking the response, so the error message
850 makes sense. */
851
852 else if (errno != 0 || buffer[0] == 0)
853 {
854 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
855 transport_rcpt_address(addr, include_affixes));
856 return -2;
857 }
858
859 /* Handle SMTP permanent and temporary response codes. */
860
861 else
862 {
863 addr->message =
864 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
865 "%s", transport_rcpt_address(addr, include_affixes),
866 string_printing(buffer));
867 setflag(addr, af_pass_message);
868 msglog_line(host, addr->message);
869
870 /* The response was 5xx */
871
872 if (buffer[0] == '5')
873 {
874 addr->transport_return = FAIL;
875 yield |= 2;
876 }
877
878 /* The response was 4xx */
879
880 else
881 {
882 addr->transport_return = DEFER;
883 addr->basic_errno = ERRNO_RCPT4XX;
884 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
885
886 /* Log temporary errors if there are more hosts to be tried.
887 If not, log this last one in the == line. */
888
889 if (host->next)
890 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
891
892 /* Do not put this message on the list of those waiting for specific
893 hosts, as otherwise it is likely to be tried too often. */
894
895 update_waiting = FALSE;
896
897 /* Add a retry item for the address so that it doesn't get tried again
898 too soon. If address_retry_include_sender is true, add the sender address
899 to the retry key. */
900
901 if (address_retry_include_sender)
902 {
903 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
904 sender_address);
905 retry_add_item(addr, altkey, 0);
906 }
907 else retry_add_item(addr, addr->address_retry_key, 0);
908 }
909 }
910 } /* Loop for next RCPT response */
911
912 /* Update where to start at for the next block of responses, unless we
913 have already handled all the addresses. */
914
915 if (addr != NULL) *sync_addr = addr->next;
916
917 /* Handle a response to DATA. If we have not had any good recipients, either
918 previously or in this block, the response is ignored. */
919
920 if (pending_DATA != 0 &&
921 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
922 {
923 int code;
924 uschar *msg;
925 BOOL pass_message;
926 if (pending_DATA > 0 || (yield & 1) != 0)
927 {
928 if (errno == 0 && buffer[0] == '4')
929 {
930 errno = ERRNO_DATA4XX;
931 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
932 }
933 return -3;
934 }
935 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
936 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
937 "is in use and there were no good recipients\n", msg);
938 }
939
940 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
941 present) received 3xx. If any RCPTs were handled and yielded anything other
942 than 4xx, yield will be set non-zero. */
943
944 return yield;
945 }
946
947
948
949 /* Do the client side of smtp-level authentication */
950 /*
951 Arguments:
952 buffer EHLO response from server (gets overwritten)
953 addrlist chain of potential addresses to deliver
954 host host to deliver to
955 ob transport options
956 ibp, obp comms channel control blocks
957
958 Returns:
959 OK Success, or failed (but not required): global "smtp_authenticated" set
960 DEFER Failed authentication (and was required)
961 ERROR Internal problem
962
963 FAIL_SEND Failed communications - transmit
964 FAIL - response
965 */
966
967 int
968 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
969 smtp_transport_options_block *ob, BOOL is_esmtp,
970 smtp_inblock *ibp, smtp_outblock *obp)
971 {
972 int require_auth;
973 uschar *fail_reason = US"server did not advertise AUTH support";
974
975 smtp_authenticated = FALSE;
976 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
977 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
978
979 if (is_esmtp && !regex_AUTH) regex_AUTH =
980 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
981 FALSE, TRUE);
982
983 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
984 {
985 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
986 expand_nmax = -1; /* reset */
987
988 /* Must not do this check until after we have saved the result of the
989 regex match above. */
990
991 if (require_auth == OK ||
992 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
993 {
994 auth_instance *au;
995 fail_reason = US"no common mechanisms were found";
996
997 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
998
999 /* Scan the configured authenticators looking for one which is configured
1000 for use as a client, which is not suppressed by client_condition, and
1001 whose name matches an authentication mechanism supported by the server.
1002 If one is found, attempt to authenticate by calling its client function.
1003 */
1004
1005 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1006 {
1007 uschar *p = names;
1008 if (!au->client ||
1009 (au->client_condition != NULL &&
1010 !expand_check_condition(au->client_condition, au->name,
1011 US"client authenticator")))
1012 {
1013 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1014 au->name,
1015 (au->client)? "client_condition is false" :
1016 "not configured as a client");
1017 continue;
1018 }
1019
1020 /* Loop to scan supported server mechanisms */
1021
1022 while (*p != 0)
1023 {
1024 int rc;
1025 int len = Ustrlen(au->public_name);
1026 while (isspace(*p)) p++;
1027
1028 if (strncmpic(au->public_name, p, len) != 0 ||
1029 (p[len] != 0 && !isspace(p[len])))
1030 {
1031 while (*p != 0 && !isspace(*p)) p++;
1032 continue;
1033 }
1034
1035 /* Found data for a listed mechanism. Call its client entry. Set
1036 a flag in the outblock so that data is overwritten after sending so
1037 that reflections don't show it. */
1038
1039 fail_reason = US"authentication attempt(s) failed";
1040 obp->authenticating = TRUE;
1041 rc = (au->info->clientcode)(au, ibp, obp,
1042 ob->command_timeout, buffer, bufsize);
1043 obp->authenticating = FALSE;
1044 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1045 au->name, rc);
1046
1047 /* A temporary authentication failure must hold up delivery to
1048 this host. After a permanent authentication failure, we carry on
1049 to try other authentication methods. If all fail hard, try to
1050 deliver the message unauthenticated unless require_auth was set. */
1051
1052 switch(rc)
1053 {
1054 case OK:
1055 smtp_authenticated = TRUE; /* stops the outer loop */
1056 client_authenticator = au->name;
1057 if (au->set_client_id != NULL)
1058 client_authenticated_id = expand_string(au->set_client_id);
1059 break;
1060
1061 /* Failure after writing a command */
1062
1063 case FAIL_SEND:
1064 return FAIL_SEND;
1065
1066 /* Failure after reading a response */
1067
1068 case FAIL:
1069 if (errno != 0 || buffer[0] != '5') return FAIL;
1070 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1071 au->name, host->name, host->address, buffer);
1072 break;
1073
1074 /* Failure by some other means. In effect, the authenticator
1075 decided it wasn't prepared to handle this case. Typically this
1076 is the result of "fail" in an expansion string. Do we need to
1077 log anything here? Feb 2006: a message is now put in the buffer
1078 if logging is required. */
1079
1080 case CANCELLED:
1081 if (*buffer != 0)
1082 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1083 "authentication H=%s [%s] %s", au->name, host->name,
1084 host->address, buffer);
1085 break;
1086
1087 /* Internal problem, message in buffer. */
1088
1089 case ERROR:
1090 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1091 DEFER, FALSE, NULL);
1092 return ERROR;
1093 }
1094
1095 break; /* If not authenticated, try next authenticator */
1096 } /* Loop for scanning supported server mechanisms */
1097 } /* Loop for further authenticators */
1098 }
1099 }
1100
1101 /* If we haven't authenticated, but are required to, give up. */
1102
1103 if (require_auth == OK && !smtp_authenticated)
1104 {
1105 set_errno(addrlist, ERRNO_AUTHFAIL,
1106 string_sprintf("authentication required but %s", fail_reason), DEFER,
1107 FALSE, NULL);
1108 return DEFER;
1109 }
1110
1111 return OK;
1112 }
1113
1114
1115 /* Construct AUTH appendix string for MAIL TO */
1116 /*
1117 Arguments
1118 buffer to build string
1119 addrlist chain of potential addresses to deliver
1120 ob transport options
1121
1122 Globals smtp_authenticated
1123 client_authenticated_sender
1124 Return True on error, otherwise buffer has (possibly empty) terminated string
1125 */
1126
1127 BOOL
1128 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1129 smtp_transport_options_block *ob)
1130 {
1131 uschar *local_authenticated_sender = authenticated_sender;
1132
1133 #ifdef notdef
1134 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1135 #endif
1136
1137 if (ob->authenticated_sender != NULL)
1138 {
1139 uschar *new = expand_string(ob->authenticated_sender);
1140 if (new == NULL)
1141 {
1142 if (!expand_string_forcedfail)
1143 {
1144 uschar *message = string_sprintf("failed to expand "
1145 "authenticated_sender: %s", expand_string_message);
1146 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1147 return TRUE;
1148 }
1149 }
1150 else if (new[0] != 0) local_authenticated_sender = new;
1151 }
1152
1153 /* Add the authenticated sender address if present */
1154
1155 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1156 local_authenticated_sender != NULL)
1157 {
1158 string_format(buffer, bufsize, " AUTH=%s",
1159 auth_xtextencode(local_authenticated_sender,
1160 Ustrlen(local_authenticated_sender)));
1161 client_authenticated_sender = string_copy(local_authenticated_sender);
1162 }
1163 else
1164 *buffer= 0;
1165
1166 return FALSE;
1167 }
1168
1169
1170
1171 #ifdef EXPERIMENTAL_DANE
1172 int
1173 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1174 BOOL dane_required, BOOL * dane)
1175 {
1176 /* move this out to host.c given the similarity to dns_lookup() ? */
1177 uschar buffer[300];
1178 const uschar * fullname = buffer;
1179
1180 /* TLSA lookup string */
1181 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1182
1183 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1184 {
1185 case DNS_AGAIN:
1186 return DEFER; /* just defer this TLS'd conn */
1187
1188 default:
1189 case DNS_FAIL:
1190 if (dane_required)
1191 {
1192 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1193 return FAIL;
1194 }
1195 break;
1196
1197 case DNS_SUCCEED:
1198 if (!dns_is_secure(dnsa))
1199 {
1200 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1201 return DEFER;
1202 }
1203 *dane = TRUE;
1204 break;
1205 }
1206 return OK;
1207 }
1208 #endif
1209
1210
1211
1212 typedef struct smtp_compare_s
1213 {
1214 uschar *current_sender_address;
1215 struct transport_instance *tblock;
1216 } smtp_compare_t;
1217
1218 /*
1219 Create a unique string that identifies this message, it is based on
1220 sender_address, helo_data and tls_certificate if enabled. */
1221
1222 static uschar *
1223 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1224 {
1225 address_item * addr1;
1226 uschar * if1 = US"";
1227 uschar * helo1 = US"";
1228 #ifdef SUPPORT_TLS
1229 uschar * tlsc1 = US"";
1230 #endif
1231 uschar * save_sender_address = sender_address;
1232 uschar * local_identity = NULL;
1233 smtp_transport_options_block * ob =
1234 (smtp_transport_options_block *)tblock->options_block;
1235
1236 sender_address = sender;
1237
1238 addr1 = deliver_make_addr (sender, TRUE);
1239 deliver_set_expansions(addr1);
1240
1241 if (ob->interface)
1242 if1 = expand_string(ob->interface);
1243
1244 if (ob->helo_data)
1245 helo1 = expand_string(ob->helo_data);
1246
1247 #ifdef SUPPORT_TLS
1248 if (ob->tls_certificate)
1249 tlsc1 = expand_string(ob->tls_certificate);
1250 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1251 #else
1252 local_identity = string_sprintf ("%s^%s", if1, helo1);
1253 #endif
1254
1255 deliver_set_expansions(NULL);
1256 sender_address = save_sender_address;
1257
1258 return local_identity;
1259 }
1260
1261
1262
1263 /* This routine is a callback that is called from transport_check_waiting.
1264 This function will evaluate the incoming message versus the previous
1265 message. If the incoming message is using a different local identity then
1266 we will veto this new message. */
1267
1268 static BOOL
1269 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1270 {
1271 uschar * save_sender_address = sender_address;
1272 uschar * current_local_identity =
1273 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1274 uschar * new_sender_address = deliver_get_sender_address(message_id);
1275 uschar * message_local_identity =
1276 smtp_local_identity(new_sender_address, s_compare->tblock);
1277
1278 sender_address = save_sender_address;
1279
1280 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1281 }
1282
1283
1284
1285 /*************************************************
1286 * Deliver address list to given host *
1287 *************************************************/
1288
1289 /* If continue_hostname is not null, we get here only when continuing to
1290 deliver down an existing channel. The channel was passed as the standard
1291 input. TLS is never active on a passed channel; the previous process always
1292 closes it down before passing the connection on.
1293
1294 Otherwise, we have to make a connection to the remote host, and do the
1295 initial protocol exchange.
1296
1297 When running as an MUA wrapper, if the sender or any recipient is rejected,
1298 temporarily or permanently, we force failure for all recipients.
1299
1300 Arguments:
1301 addrlist chain of potential addresses to deliver; only those whose
1302 transport_return field is set to PENDING_DEFER are currently
1303 being processed; others should be skipped - they have either
1304 been delivered to an earlier host or IP address, or been
1305 failed by one of them.
1306 host host to deliver to
1307 host_af AF_INET or AF_INET6
1308 port default TCP/IP port to use, in host byte order
1309 interface interface to bind to, or NULL
1310 tblock transport instance block
1311 message_defer set TRUE if yield is OK, but all addresses were deferred
1312 because of a non-recipient, non-host failure, that is, a
1313 4xx response to MAIL FROM, DATA, or ".". This is a defer
1314 that is specific to the message.
1315 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1316 a second attempt after TLS initialization fails
1317
1318 Returns: OK - the connection was made and the delivery attempted;
1319 the result for each address is in its data block.
1320 DEFER - the connection could not be made, or something failed
1321 while setting up the SMTP session, or there was a
1322 non-message-specific error, such as a timeout.
1323 ERROR - a filter command is specified for this transport,
1324 and there was a problem setting it up; OR helo_data
1325 or add_headers or authenticated_sender is specified
1326 for this transport, and the string failed to expand
1327 */
1328
1329 static int
1330 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1331 uschar *interface, transport_instance *tblock,
1332 BOOL *message_defer, BOOL suppress_tls)
1333 {
1334 address_item *addr;
1335 address_item *sync_addr;
1336 address_item *first_addr = addrlist;
1337 int yield = OK;
1338 int address_count;
1339 int save_errno;
1340 int rc;
1341 time_t start_delivery_time = time(NULL);
1342 smtp_transport_options_block *ob =
1343 (smtp_transport_options_block *)(tblock->options_block);
1344 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1345 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1346 BOOL ok = FALSE;
1347 BOOL send_rset = TRUE;
1348 BOOL send_quit = TRUE;
1349 BOOL setting_up = TRUE;
1350 BOOL completed_address = FALSE;
1351 BOOL esmtp = TRUE;
1352 BOOL pending_MAIL;
1353 BOOL pass_message = FALSE;
1354 #ifndef DISABLE_PRDR
1355 BOOL prdr_offered = FALSE;
1356 BOOL prdr_active;
1357 #endif
1358 BOOL dsn_all_lasthop = TRUE;
1359 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1360 BOOL dane = FALSE;
1361 BOOL dane_required;
1362 dns_answer tlsa_dnsa;
1363 #endif
1364 smtp_inblock inblock;
1365 smtp_outblock outblock;
1366 int max_rcpt = tblock->max_addresses;
1367 uschar *igquotstr = US"";
1368
1369 uschar *helo_data = NULL;
1370
1371 uschar *message = NULL;
1372 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1373 uschar *p;
1374 uschar buffer[4096];
1375 uschar inbuffer[4096];
1376 uschar outbuffer[4096];
1377 address_item * current_address;
1378
1379 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1380
1381 *message_defer = FALSE;
1382 smtp_command = US"initial connection";
1383 if (max_rcpt == 0) max_rcpt = 999999;
1384
1385 /* Set up the buffer for reading SMTP response packets. */
1386
1387 inblock.buffer = inbuffer;
1388 inblock.buffersize = sizeof(inbuffer);
1389 inblock.ptr = inbuffer;
1390 inblock.ptrend = inbuffer;
1391
1392 /* Set up the buffer for holding SMTP commands while pipelining */
1393
1394 outblock.buffer = outbuffer;
1395 outblock.buffersize = sizeof(outbuffer);
1396 outblock.ptr = outbuffer;
1397 outblock.cmd_count = 0;
1398 outblock.authenticating = FALSE;
1399
1400 /* Reset the parameters of a TLS session. */
1401
1402 tls_out.bits = 0;
1403 tls_out.cipher = NULL; /* the one we may use for this transport */
1404 tls_out.ourcert = NULL;
1405 tls_out.peercert = NULL;
1406 tls_out.peerdn = NULL;
1407 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1408 tls_out.sni = NULL;
1409 #endif
1410 tls_out.ocsp = OCSP_NOT_REQ;
1411
1412 /* Flip the legacy TLS-related variables over to the outbound set in case
1413 they're used in the context of the transport. Don't bother resetting
1414 afterward as we're in a subprocess. */
1415
1416 tls_modify_variables(&tls_out);
1417
1418 #ifndef SUPPORT_TLS
1419 if (smtps)
1420 {
1421 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1422 DEFER, FALSE, NULL);
1423 return ERROR;
1424 }
1425 #endif
1426
1427 /* Make a connection to the host if this isn't a continued delivery, and handle
1428 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1429 specially so they can be identified for retries. */
1430
1431 if (continue_hostname == NULL)
1432 {
1433 /* This puts port into host->port */
1434 inblock.sock = outblock.sock =
1435 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1436
1437 if (inblock.sock < 0)
1438 {
1439 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1440 NULL, DEFER, FALSE, NULL);
1441 return DEFER;
1442 }
1443
1444 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1445 {
1446 tls_out.dane_verified = FALSE;
1447 tls_out.tlsa_usage = 0;
1448
1449 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1450
1451 if (host->dnssec == DS_YES)
1452 {
1453 if( dane_required
1454 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1455 )
1456 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
1457 return rc;
1458 }
1459 else if (dane_required)
1460 {
1461 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1462 return FAIL;
1463 }
1464
1465 if (dane)
1466 ob->tls_tempfail_tryclear = FALSE;
1467 }
1468 #endif /*DANE*/
1469
1470 /* Expand the greeting message while waiting for the initial response. (Makes
1471 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1472 delayed till here so that $sending_interface and $sending_port are set. */
1473
1474 helo_data = expand_string(ob->helo_data);
1475
1476 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1477 is nevertheless a reasonably clean way of programming this kind of logic,
1478 where you want to escape on any error. */
1479
1480 if (!smtps)
1481 {
1482 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1483 ob->command_timeout)) goto RESPONSE_FAILED;
1484
1485 #ifdef EXPERIMENTAL_EVENT
1486 {
1487 uschar * s;
1488 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1489 : host->dnssec==DS_NO ? US"no" : NULL;
1490 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1491 if (s)
1492 {
1493 set_errno(addrlist, ERRNO_EXPANDFAIL,
1494 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1495 DEFER, FALSE, NULL);
1496 yield = DEFER;
1497 goto SEND_QUIT;
1498 }
1499 }
1500 #endif
1501
1502 /* Now check if the helo_data expansion went well, and sign off cleanly if
1503 it didn't. */
1504
1505 if (helo_data == NULL)
1506 {
1507 uschar *message = string_sprintf("failed to expand helo_data: %s",
1508 expand_string_message);
1509 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1510 yield = DEFER;
1511 goto SEND_QUIT;
1512 }
1513 }
1514
1515 /** Debugging without sending a message
1516 addrlist->transport_return = DEFER;
1517 goto SEND_QUIT;
1518 **/
1519
1520 /* Errors that occur after this point follow an SMTP command, which is
1521 left in big_buffer by smtp_write_command() for use in error messages. */
1522
1523 smtp_command = big_buffer;
1524
1525 /* Tell the remote who we are...
1526
1527 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1528 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1529 greeting is of this form. The assumption was that the far end supports it
1530 properly... but experience shows that there are some that give 5xx responses,
1531 even though the banner includes "ESMTP" (there's a bloody-minded one that
1532 says "ESMTP not spoken here"). Cope with that case.
1533
1534 September 2000: Time has passed, and it seems reasonable now to always send
1535 EHLO at the start. It is also convenient to make the change while installing
1536 the TLS stuff.
1537
1538 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1539 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1540 would be no way to send out the mails, so there is now a host list
1541 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1542 PIPELINING problem as well. Maybe it can also be useful to cure other
1543 problems with broken servers.
1544
1545 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1546 Then somebody tried it with a Microsoft mailer... It seems that all other
1547 mailers use upper case for some reason (the RFC is quite clear about case
1548 independence) so, for peace of mind, I gave in. */
1549
1550 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1551
1552 /* Alas; be careful, since this goto is not an error-out, so conceivably
1553 we might set data between here and the target which we assume to exist
1554 and be usable. I can see this coming back to bite us. */
1555 #ifdef SUPPORT_TLS
1556 if (smtps)
1557 {
1558 tls_offered = TRUE;
1559 suppress_tls = FALSE;
1560 ob->tls_tempfail_tryclear = FALSE;
1561 smtp_command = US"SSL-on-connect";
1562 goto TLS_NEGOTIATE;
1563 }
1564 #endif
1565
1566 if (esmtp)
1567 {
1568 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1569 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1570 goto SEND_FAILED;
1571 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1572 ob->command_timeout))
1573 {
1574 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1575 esmtp = FALSE;
1576 }
1577 }
1578 else
1579 {
1580 DEBUG(D_transport)
1581 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1582 }
1583
1584 if (!esmtp)
1585 {
1586 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1587 goto SEND_FAILED;
1588 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1589 ob->command_timeout)) goto RESPONSE_FAILED;
1590 }
1591
1592 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1593 lmtp_ignore_quota option was set. */
1594
1595 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1596 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1597 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1598
1599 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1600
1601 #ifdef SUPPORT_TLS
1602 tls_offered = esmtp &&
1603 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1604 PCRE_EOPT, NULL, 0) >= 0;
1605 #endif
1606
1607 #ifndef DISABLE_PRDR
1608 prdr_offered = esmtp
1609 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1610 PCRE_EOPT, NULL, 0) >= 0
1611 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1612
1613 if (prdr_offered)
1614 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1615 #endif
1616 }
1617
1618 /* For continuing deliveries down the same channel, the socket is the standard
1619 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1620 below). Set up the pointer to where subsequent commands will be left, for
1621 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1622 set from the command line if they were set in the process that passed the
1623 connection on. */
1624
1625 else
1626 {
1627 inblock.sock = outblock.sock = fileno(stdin);
1628 smtp_command = big_buffer;
1629 host->port = port; /* Record the port that was used */
1630 }
1631
1632 /* If TLS is available on this connection, whether continued or not, attempt to
1633 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1634 send another EHLO - the server may give a different answer in secure mode. We
1635 use a separate buffer for reading the response to STARTTLS so that if it is
1636 negative, the original EHLO data is available for subsequent analysis, should
1637 the client not be required to use TLS. If the response is bad, copy the buffer
1638 for error analysis. */
1639
1640 #ifdef SUPPORT_TLS
1641 if ( tls_offered
1642 && !suppress_tls
1643 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1644 {
1645 uschar buffer2[4096];
1646 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1647 goto SEND_FAILED;
1648
1649 /* If there is an I/O error, transmission of this message is deferred. If
1650 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1651 false, we also defer. However, if there is a temporary rejection of STARTTLS
1652 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1653 STARTTLS, we carry on. This means we will try to send the message in clear,
1654 unless the host is in hosts_require_tls (tested below). */
1655
1656 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1657 ob->command_timeout))
1658 {
1659 if (errno != 0 || buffer2[0] == 0 ||
1660 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1661 {
1662 Ustrncpy(buffer, buffer2, sizeof(buffer));
1663 goto RESPONSE_FAILED;
1664 }
1665 }
1666
1667 /* STARTTLS accepted: try to negotiate a TLS session. */
1668
1669 else
1670 TLS_NEGOTIATE:
1671 {
1672 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1673 # ifdef EXPERIMENTAL_DANE
1674 , dane ? &tlsa_dnsa : NULL
1675 # endif
1676 );
1677
1678 /* TLS negotiation failed; give an error. From outside, this function may
1679 be called again to try in clear on a new connection, if the options permit
1680 it for this host. */
1681
1682 if (rc != OK)
1683 {
1684 # ifdef EXPERIMENTAL_DANE
1685 if (rc == DEFER && dane && !dane_required)
1686 {
1687 log_write(0, LOG_MAIN, "DANE attempt failed;"
1688 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1689 host->name, host->address);
1690 dane = FALSE;
1691 goto TLS_NEGOTIATE;
1692 }
1693 # endif
1694
1695 save_errno = ERRNO_TLSFAILURE;
1696 message = US"failure while setting up TLS session";
1697 send_quit = FALSE;
1698 goto TLS_FAILED;
1699 }
1700
1701 /* TLS session is set up */
1702
1703 for (addr = addrlist; addr != NULL; addr = addr->next)
1704 if (addr->transport_return == PENDING_DEFER)
1705 {
1706 addr->cipher = tls_out.cipher;
1707 addr->ourcert = tls_out.ourcert;
1708 addr->peercert = tls_out.peercert;
1709 addr->peerdn = tls_out.peerdn;
1710 addr->ocsp = tls_out.ocsp;
1711 }
1712 }
1713 }
1714
1715 /* if smtps, we'll have smtp_command set to something else; always safe to
1716 reset it here. */
1717 smtp_command = big_buffer;
1718
1719 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1720 helo_data is null, we are dealing with a connection that was passed from
1721 another process, and so we won't have expanded helo_data above. We have to
1722 expand it here. $sending_ip_address and $sending_port are set up right at the
1723 start of the Exim process (in exim.c). */
1724
1725 if (tls_out.active >= 0)
1726 {
1727 char *greeting_cmd;
1728 if (helo_data == NULL)
1729 {
1730 helo_data = expand_string(ob->helo_data);
1731 if (helo_data == NULL)
1732 {
1733 uschar *message = string_sprintf("failed to expand helo_data: %s",
1734 expand_string_message);
1735 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1736 yield = DEFER;
1737 goto SEND_QUIT;
1738 }
1739 }
1740
1741 /* For SMTPS we need to wait for the initial OK response. */
1742 if (smtps)
1743 {
1744 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1745 ob->command_timeout)) goto RESPONSE_FAILED;
1746 }
1747
1748 if (esmtp)
1749 greeting_cmd = "EHLO";
1750 else
1751 {
1752 greeting_cmd = "HELO";
1753 DEBUG(D_transport)
1754 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1755 }
1756
1757 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1758 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1759 goto SEND_FAILED;
1760 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1761 ob->command_timeout))
1762 goto RESPONSE_FAILED;
1763 }
1764
1765 /* If the host is required to use a secure channel, ensure that we
1766 have one. */
1767
1768 else if (
1769 # ifdef EXPERIMENTAL_DANE
1770 dane ||
1771 # endif
1772 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1773 )
1774 {
1775 save_errno = ERRNO_TLSREQUIRED;
1776 message = string_sprintf("a TLS session is required, but %s",
1777 tls_offered? "an attempt to start TLS failed" :
1778 "the server did not offer TLS support");
1779 goto TLS_FAILED;
1780 }
1781 #endif /*SUPPORT_TLS*/
1782
1783 /* If TLS is active, we have just started it up and re-done the EHLO command,
1784 so its response needs to be analyzed. If TLS is not active and this is a
1785 continued session down a previously-used socket, we haven't just done EHLO, so
1786 we skip this. */
1787
1788 if (continue_hostname == NULL
1789 #ifdef SUPPORT_TLS
1790 || tls_out.active >= 0
1791 #endif
1792 )
1793 {
1794 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1795 lmtp_ignore_quota option was set. */
1796
1797 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1798 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1799 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1800
1801 /* If the response to EHLO specified support for the SIZE parameter, note
1802 this, provided size_addition is non-negative. */
1803
1804 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1805 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1806 PCRE_EOPT, NULL, 0) >= 0;
1807
1808 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1809 the current host, esmtp will be false, so PIPELINING can never be used. If
1810 the current host matches hosts_avoid_pipelining, don't do it. */
1811
1812 smtp_use_pipelining = esmtp
1813 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1814 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1815 PCRE_EOPT, NULL, 0) >= 0;
1816
1817 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1818 smtp_use_pipelining? "" : "not ");
1819
1820 #ifndef DISABLE_PRDR
1821 prdr_offered = esmtp
1822 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1823 PCRE_EOPT, NULL, 0) >= 0
1824 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1825
1826 if (prdr_offered)
1827 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1828 #endif
1829
1830 /* Note if the server supports DSN */
1831 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1832 PCRE_EOPT, NULL, 0) >= 0;
1833 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1834
1835 /* Note if the response to EHLO specifies support for the AUTH extension.
1836 If it has, check that this host is one we want to authenticate to, and do
1837 the business. The host name and address must be available when the
1838 authenticator's client driver is running. */
1839
1840 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1841 ob, esmtp, &inblock, &outblock))
1842 {
1843 default: goto SEND_QUIT;
1844 case OK: break;
1845 case FAIL_SEND: goto SEND_FAILED;
1846 case FAIL: goto RESPONSE_FAILED;
1847 }
1848 }
1849
1850 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1851 message-specific. */
1852
1853 setting_up = FALSE;
1854
1855 /* If there is a filter command specified for this transport, we can now
1856 set it up. This cannot be done until the identify of the host is known. */
1857
1858 if (tblock->filter_command != NULL)
1859 {
1860 BOOL rc;
1861 uschar buffer[64];
1862 sprintf(CS buffer, "%.50s transport", tblock->name);
1863 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1864 TRUE, DEFER, addrlist, buffer, NULL);
1865 transport_filter_timeout = tblock->filter_timeout;
1866
1867 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1868 yield ERROR. */
1869
1870 if (!rc)
1871 {
1872 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1873 FALSE, NULL);
1874 yield = ERROR;
1875 goto SEND_QUIT;
1876 }
1877 }
1878
1879
1880 /* For messages that have more than the maximum number of envelope recipients,
1881 we want to send several transactions down the same SMTP connection. (See
1882 comments in deliver.c as to how this reconciles, heuristically, with
1883 remote_max_parallel.) This optimization was added to Exim after the following
1884 code was already working. The simplest way to put it in without disturbing the
1885 code was to use a goto to jump back to this point when there is another
1886 transaction to handle. */
1887
1888 SEND_MESSAGE:
1889 sync_addr = first_addr;
1890 address_count = 0;
1891 ok = FALSE;
1892 send_rset = TRUE;
1893 completed_address = FALSE;
1894
1895
1896 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1897 qualification, send it, adding something to the message size to allow for
1898 imprecision and things that get added en route. Exim keeps the number of lines
1899 in a message, so we can give an accurate value for the original message, but we
1900 need some additional to handle added headers. (Double "." characters don't get
1901 included in the count.) */
1902
1903 p = buffer;
1904 *p = 0;
1905
1906 if (smtp_use_size)
1907 {
1908 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1909 while (*p) p++;
1910 }
1911
1912 #ifndef DISABLE_PRDR
1913 prdr_active = FALSE;
1914 if (prdr_offered)
1915 {
1916 for (addr = first_addr; addr; addr = addr->next)
1917 if (addr->transport_return == PENDING_DEFER)
1918 {
1919 for (addr = addr->next; addr; addr = addr->next)
1920 if (addr->transport_return == PENDING_DEFER)
1921 { /* at least two recipients to send */
1922 prdr_active = TRUE;
1923 sprintf(CS p, " PRDR"); p += 5;
1924 break;
1925 }
1926 break;
1927 }
1928 }
1929 #endif
1930
1931 /* check if all addresses have lasthop flag */
1932 /* do not send RET and ENVID if true */
1933 dsn_all_lasthop = TRUE;
1934 for (addr = first_addr;
1935 address_count < max_rcpt && addr != NULL;
1936 addr = addr->next)
1937 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1938 dsn_all_lasthop = FALSE;
1939
1940 /* Add any DSN flags to the mail command */
1941
1942 if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1943 {
1944 if (dsn_ret == dsn_ret_hdrs)
1945 {
1946 Ustrcpy(p, " RET=HDRS");
1947 while (*p) p++;
1948 }
1949 else if (dsn_ret == dsn_ret_full)
1950 {
1951 Ustrcpy(p, " RET=FULL");
1952 while (*p) p++;
1953 }
1954 if (dsn_envid != NULL)
1955 {
1956 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1957 while (*p) p++;
1958 }
1959 }
1960
1961 /* If an authenticated_sender override has been specified for this transport
1962 instance, expand it. If the expansion is forced to fail, and there was already
1963 an authenticated_sender for this message, the original value will be used.
1964 Other expansion failures are serious. An empty result is ignored, but there is
1965 otherwise no check - this feature is expected to be used with LMTP and other
1966 cases where non-standard addresses (e.g. without domains) might be required. */
1967
1968 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1969 {
1970 yield = ERROR;
1971 goto SEND_QUIT;
1972 }
1973
1974 /* From here until we send the DATA command, we can make use of PIPELINING
1975 if the server host supports it. The code has to be able to check the responses
1976 at any point, for when the buffer fills up, so we write it totally generally.
1977 When PIPELINING is off, each command written reports that it has flushed the
1978 buffer. */
1979
1980 pending_MAIL = TRUE; /* The block starts with MAIL */
1981
1982 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1983 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1984 mail_command = string_copy(big_buffer); /* Save for later error message */
1985
1986 switch(rc)
1987 {
1988 case -1: /* Transmission error */
1989 goto SEND_FAILED;
1990
1991 case +1: /* Block was sent */
1992 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1993 ob->command_timeout))
1994 {
1995 if (errno == 0 && buffer[0] == '4')
1996 {
1997 errno = ERRNO_MAIL4XX;
1998 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1999 }
2000 goto RESPONSE_FAILED;
2001 }
2002 pending_MAIL = FALSE;
2003 break;
2004 }
2005
2006 /* Pass over all the relevant recipient addresses for this host, which are the
2007 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2008 several before we have to read the responses for those seen so far. This
2009 checking is done by a subroutine because it also needs to be done at the end.
2010 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2011 the next one if not all are sent.
2012
2013 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2014 last address because we want to abort if any recipients have any kind of
2015 problem, temporary or permanent. We know that all recipient addresses will have
2016 the PENDING_DEFER status, because only one attempt is ever made, and we know
2017 that max_rcpt will be large, so all addresses will be done at once. */
2018
2019 for (addr = first_addr;
2020 address_count < max_rcpt && addr != NULL;
2021 addr = addr->next)
2022 {
2023 int count;
2024 BOOL no_flush;
2025
2026 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2027
2028 if (addr->transport_return != PENDING_DEFER) continue;
2029
2030 address_count++;
2031 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2032
2033 /* Add any DSN flags to the rcpt command and add to the sent string */
2034
2035 p = buffer;
2036 *p = 0;
2037
2038 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2039 {
2040 if ((addr->dsn_flags & rf_dsnflags) != 0)
2041 {
2042 int i;
2043 BOOL first = TRUE;
2044 Ustrcpy(p, " NOTIFY=");
2045 while (*p) p++;
2046 for (i = 0; i < 4; i++)
2047 if ((addr->dsn_flags & rf_list[i]) != 0)
2048 {
2049 if (!first) *p++ = ',';
2050 first = FALSE;
2051 Ustrcpy(p, rf_names[i]);
2052 while (*p) p++;
2053 }
2054 }
2055
2056 if (addr->dsn_orcpt != NULL)
2057 {
2058 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2059 addr->dsn_orcpt);
2060 while (*p) p++;
2061 }
2062 }
2063
2064 /* Now send the RCPT command, and process outstanding responses when
2065 necessary. After a timeout on RCPT, we just end the function, leaving the
2066 yield as OK, because this error can often mean that there is a problem with
2067 just one address, so we don't want to delay the host. */
2068
2069 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2070 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
2071
2072 if (count < 0) goto SEND_FAILED;
2073 if (count > 0)
2074 {
2075 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2076 &sync_addr, host, count, ob->address_retry_include_sender,
2077 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2078 sizeof(buffer)))
2079 {
2080 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2081 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2082 break;
2083
2084 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2085 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2086 case 0: /* No 2xx or 5xx, but no probs */
2087 break;
2088
2089 case -1: goto END_OFF; /* Timeout on RCPT */
2090 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2091 }
2092 pending_MAIL = FALSE; /* Dealt with MAIL */
2093 }
2094 } /* Loop for next address */
2095
2096 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2097 permanently or temporarily. We should have flushed and synced after the last
2098 RCPT. */
2099
2100 if (mua_wrapper)
2101 {
2102 address_item *badaddr;
2103 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2104 if (badaddr->transport_return != PENDING_OK)
2105 {
2106 /*XXX could we find a better errno than 0 here? */
2107 set_errno(addrlist, 0, badaddr->message, FAIL,
2108 testflag(badaddr, af_pass_message), NULL);
2109 ok = FALSE;
2110 break;
2111 }
2112 }
2113
2114 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2115 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2116 have a good recipient buffered up if we are pipelining. We don't want to waste
2117 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2118 are pipelining. The responses are all handled by sync_responses(). */
2119
2120 if (ok || (smtp_use_pipelining && !mua_wrapper))
2121 {
2122 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2123 if (count < 0) goto SEND_FAILED;
2124 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2125 host, count, ob->address_retry_include_sender, pending_MAIL,
2126 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2127 {
2128 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2129 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2130 break;
2131
2132 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2133 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2134 case 0: break; /* No 2xx or 5xx, but no probs */
2135
2136 case -1: goto END_OFF; /* Timeout on RCPT */
2137 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2138 }
2139 }
2140
2141 /* Save the first address of the next batch. */
2142
2143 first_addr = addr;
2144
2145 /* If there were no good recipients (but otherwise there have been no
2146 problems), just set ok TRUE, since we have handled address-specific errors
2147 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2148 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2149 well as body. Set the appropriate timeout value to be used for each chunk.
2150 (Haven't been able to make it work using select() for writing yet.) */
2151
2152 if (!ok) ok = TRUE; else
2153 {
2154 sigalrm_seen = FALSE;
2155 transport_write_timeout = ob->data_timeout;
2156 smtp_command = US"sending data block"; /* For error messages */
2157 DEBUG(D_transport|D_v)
2158 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2159 transport_count = 0;
2160
2161 #ifndef DISABLE_DKIM
2162 ok = dkim_transport_write_message(addrlist, inblock.sock,
2163 topt_use_crlf | topt_end_dot | topt_escape_headers |
2164 (tblock->body_only? topt_no_headers : 0) |
2165 (tblock->headers_only? topt_no_body : 0) |
2166 (tblock->return_path_add? topt_add_return_path : 0) |
2167 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2168 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2169 0, /* No size limit */
2170 tblock->add_headers, tblock->remove_headers,
2171 US".", US"..", /* Escaping strings */
2172 tblock->rewrite_rules, tblock->rewrite_existflags,
2173 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2174 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2175 );
2176 #else
2177 ok = transport_write_message(addrlist, inblock.sock,
2178 topt_use_crlf | topt_end_dot | topt_escape_headers |
2179 (tblock->body_only? topt_no_headers : 0) |
2180 (tblock->headers_only? topt_no_body : 0) |
2181 (tblock->return_path_add? topt_add_return_path : 0) |
2182 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2183 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2184 0, /* No size limit */
2185 tblock->add_headers, tblock->remove_headers,
2186 US".", US"..", /* Escaping strings */
2187 tblock->rewrite_rules, tblock->rewrite_existflags);
2188 #endif
2189
2190 /* transport_write_message() uses write() because it is called from other
2191 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2192 it can exit with "Broken pipe" as its error. This really means that the
2193 socket got closed at the far end. */
2194
2195 transport_write_timeout = 0; /* for subsequent transports */
2196
2197 /* Failure can either be some kind of I/O disaster (including timeout),
2198 or the failure of a transport filter or the expansion of added headers. */
2199
2200 if (!ok)
2201 {
2202 buffer[0] = 0; /* There hasn't been a response */
2203 goto RESPONSE_FAILED;
2204 }
2205
2206 /* We used to send the terminating "." explicitly here, but because of
2207 buffering effects at both ends of TCP/IP connections, you don't gain
2208 anything by keeping it separate, so it might as well go in the final
2209 data buffer for efficiency. This is now done by setting the topt_end_dot
2210 flag above. */
2211
2212 smtp_command = US"end of data";
2213
2214 #ifndef DISABLE_PRDR
2215 /* For PRDR we optionally get a partial-responses warning
2216 * followed by the individual responses, before going on with
2217 * the overall response. If we don't get the warning then deal
2218 * with per non-PRDR. */
2219 if(prdr_active)
2220 {
2221 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2222 ob->final_timeout);
2223 if (!ok && errno == 0)
2224 switch(buffer[0])
2225 {
2226 case '2': prdr_active = FALSE;
2227 ok = TRUE;
2228 break;
2229 case '4': errno = ERRNO_DATA4XX;
2230 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2231 break;
2232 }
2233 }
2234 else
2235 #endif
2236
2237 /* For non-PRDR SMTP, we now read a single response that applies to the
2238 whole message. If it is OK, then all the addresses have been delivered. */
2239
2240 if (!lmtp)
2241 {
2242 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2243 ob->final_timeout);
2244 if (!ok && errno == 0 && buffer[0] == '4')
2245 {
2246 errno = ERRNO_DATA4XX;
2247 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2248 }
2249 }
2250
2251 /* For LMTP, we get back a response for every RCPT command that we sent;
2252 some may be accepted and some rejected. For those that get a response, their
2253 status is fixed; any that are accepted have been handed over, even if later
2254 responses crash - at least, that's how I read RFC 2033.
2255
2256 If all went well, mark the recipient addresses as completed, record which
2257 host/IPaddress they were delivered to, and cut out RSET when sending another
2258 message down the same channel. Write the completed addresses to the journal
2259 now so that they are recorded in case there is a crash of hardware or
2260 software before the spool gets updated. Also record the final SMTP
2261 confirmation if needed (for SMTP only). */
2262
2263 if (ok)
2264 {
2265 int flag = '=';
2266 int delivery_time = (int)(time(NULL) - start_delivery_time);
2267 int len;
2268 uschar *conf = NULL;
2269 send_rset = FALSE;
2270
2271 /* Set up confirmation if needed - applies only to SMTP */
2272
2273 if (
2274 #ifndef EXPERIMENTAL_EVENT
2275 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2276 #endif
2277 !lmtp
2278 )
2279 {
2280 const uschar *s = string_printing(buffer);
2281 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2282 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2283 }
2284
2285 /* Process all transported addresses - for LMTP or PRDR, read a status for
2286 each one. */
2287
2288 for (addr = addrlist; addr != first_addr; addr = addr->next)
2289 {
2290 if (addr->transport_return != PENDING_OK) continue;
2291
2292 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2293 remaining addresses. Otherwise, it's a return code for just the one
2294 address. For temporary errors, add a retry item for the address so that
2295 it doesn't get tried again too soon. */
2296
2297 #ifndef DISABLE_PRDR
2298 if (lmtp || prdr_active)
2299 #else
2300 if (lmtp)
2301 #endif
2302 {
2303 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2304 ob->final_timeout))
2305 {
2306 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2307 addr->message = string_sprintf(
2308 #ifndef DISABLE_PRDR
2309 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2310 #else
2311 "LMTP error after %s: %s",
2312 #endif
2313 big_buffer, string_printing(buffer));
2314 setflag(addr, af_pass_message); /* Allow message to go to user */
2315 if (buffer[0] == '5')
2316 addr->transport_return = FAIL;
2317 else
2318 {
2319 errno = ERRNO_DATA4XX;
2320 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2321 addr->transport_return = DEFER;
2322 #ifndef DISABLE_PRDR
2323 if (!prdr_active)
2324 #endif
2325 retry_add_item(addr, addr->address_retry_key, 0);
2326 }
2327 continue;
2328 }
2329 completed_address = TRUE; /* NOW we can set this flag */
2330 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2331 {
2332 const uschar *s = string_printing(buffer);
2333 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2334 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2335 }
2336 }
2337
2338 /* SMTP, or success return from LMTP for this address. Pass back the
2339 actual host that was used. */
2340
2341 addr->transport_return = OK;
2342 addr->more_errno = delivery_time;
2343 addr->host_used = host;
2344 addr->special_action = flag;
2345 addr->message = conf;
2346 #ifndef DISABLE_PRDR
2347 if (prdr_active) addr->flags |= af_prdr_used;
2348 #endif
2349 flag = '-';
2350
2351 #ifndef DISABLE_PRDR
2352 if (!prdr_active)
2353 #endif
2354 {
2355 /* Update the journal. For homonymic addresses, use the base address plus
2356 the transport name. See lots of comments in deliver.c about the reasons
2357 for the complications when homonyms are involved. Just carry on after
2358 write error, as it may prove possible to update the spool file later. */
2359
2360 if (testflag(addr, af_homonym))
2361 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2362 else
2363 sprintf(CS buffer, "%.500s\n", addr->unique);
2364
2365 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2366 len = Ustrlen(CS buffer);
2367 if (write(journal_fd, buffer, len) != len)
2368 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2369 "%s: %s", buffer, strerror(errno));
2370 }
2371 }
2372
2373 #ifndef DISABLE_PRDR
2374 if (prdr_active)
2375 {
2376 /* PRDR - get the final, overall response. For any non-success
2377 upgrade all the address statuses. */
2378 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2379 ob->final_timeout);
2380 if (!ok)
2381 {
2382 if(errno == 0 && buffer[0] == '4')
2383 {
2384 errno = ERRNO_DATA4XX;
2385 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2386 }
2387 for (addr = addrlist; addr != first_addr; addr = addr->next)
2388 if (buffer[0] == '5' || addr->transport_return == OK)
2389 addr->transport_return = PENDING_OK; /* allow set_errno action */
2390 goto RESPONSE_FAILED;
2391 }
2392
2393 /* Update the journal, or setup retry. */
2394 for (addr = addrlist; addr != first_addr; addr = addr->next)
2395 if (addr->transport_return == OK)
2396 {
2397 if (testflag(addr, af_homonym))
2398 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2399 else
2400 sprintf(CS buffer, "%.500s\n", addr->unique);
2401
2402 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2403 len = Ustrlen(CS buffer);
2404 if (write(journal_fd, buffer, len) != len)
2405 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2406 "%s: %s", buffer, strerror(errno));
2407 }
2408 else if (addr->transport_return == DEFER)
2409 retry_add_item(addr, addr->address_retry_key, -2);
2410 }
2411 #endif
2412
2413 /* Ensure the journal file is pushed out to disk. */
2414
2415 if (EXIMfsync(journal_fd) < 0)
2416 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2417 strerror(errno));
2418 }
2419 }
2420
2421
2422 /* Handle general (not specific to one address) failures here. The value of ok
2423 is used to skip over this code on the falling through case. A timeout causes a
2424 deferral. Other errors may defer or fail according to the response code, and
2425 may set up a special errno value, e.g. after connection chopped, which is
2426 assumed if errno == 0 and there is no text in the buffer. If control reaches
2427 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2428 the problem is not related to this specific message. */
2429
2430 if (!ok)
2431 {
2432 int code;
2433
2434 RESPONSE_FAILED:
2435 save_errno = errno;
2436 message = NULL;
2437 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2438 buffer, &code, &message, &pass_message);
2439 goto FAILED;
2440
2441 SEND_FAILED:
2442 save_errno = errno;
2443 code = '4';
2444 message = US string_sprintf("send() to %s [%s] failed: %s",
2445 host->name, host->address, strerror(save_errno));
2446 send_quit = FALSE;
2447 goto FAILED;
2448
2449 /* This label is jumped to directly when a TLS negotiation has failed,
2450 or was not done for a host for which it is required. Values will be set
2451 in message and save_errno, and setting_up will always be true. Treat as
2452 a temporary error. */
2453
2454 #ifdef SUPPORT_TLS
2455 TLS_FAILED:
2456 code = '4';
2457 #endif
2458
2459 /* If the failure happened while setting up the call, see if the failure was
2460 a 5xx response (this will either be on connection, or following HELO - a 5xx
2461 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2462 never going to accept them. For other errors during setting up (timeouts or
2463 whatever), defer all addresses, and yield DEFER, so that the host is not
2464 tried again for a while. */
2465
2466 FAILED:
2467 ok = FALSE; /* For when reached by GOTO */
2468
2469 if (setting_up)
2470 {
2471 if (code == '5')
2472 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2473 else
2474 {
2475 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2476 yield = DEFER;
2477 }
2478 }
2479
2480 /* We want to handle timeouts after MAIL or "." and loss of connection after
2481 "." specially. They can indicate a problem with the sender address or with
2482 the contents of the message rather than a real error on the connection. These
2483 cases are treated in the same way as a 4xx response. This next bit of code
2484 does the classification. */
2485
2486 else
2487 {
2488 BOOL message_error;
2489
2490 switch(save_errno)
2491 {
2492 case 0:
2493 case ERRNO_MAIL4XX:
2494 case ERRNO_DATA4XX:
2495 message_error = TRUE;
2496 break;
2497
2498 case ETIMEDOUT:
2499 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2500 Ustrncmp(smtp_command,"end ",4) == 0;
2501 break;
2502
2503 case ERRNO_SMTPCLOSED:
2504 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2505 break;
2506
2507 default:
2508 message_error = FALSE;
2509 break;
2510 }
2511
2512 /* Handle the cases that are treated as message errors. These are:
2513
2514 (a) negative response or timeout after MAIL
2515 (b) negative response after DATA
2516 (c) negative response or timeout or dropped connection after "."
2517
2518 It won't be a negative response or timeout after RCPT, as that is dealt
2519 with separately above. The action in all cases is to set an appropriate
2520 error code for all the addresses, but to leave yield set to OK because the
2521 host itself has not failed. Of course, it might in practice have failed
2522 when we've had a timeout, but if so, we'll discover that at the next
2523 delivery attempt. For a temporary error, set the message_defer flag, and
2524 write to the logs for information if this is not the last host. The error
2525 for the last host will be logged as part of the address's log line. */
2526
2527 if (message_error)
2528 {
2529 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2530 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2531 pass_message, host);
2532
2533 /* If there's an errno, the message contains just the identity of
2534 the host. */
2535
2536 if (code != '5') /* Anything other than 5 is treated as temporary */
2537 {
2538 if (save_errno > 0)
2539 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2540 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2541 msglog_line(host, message);
2542 *message_defer = TRUE;
2543 }
2544 }
2545
2546 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2547 ".", or some other transportation error. We defer all addresses and yield
2548 DEFER, except for the case of failed add_headers expansion, or a transport
2549 filter failure, when the yield should be ERROR, to stop it trying other
2550 hosts. */
2551
2552 else
2553 {
2554 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2555 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2556 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2557 }
2558 }
2559 }
2560
2561
2562 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2563 SMTP session tidily. However, if there were too many addresses to send in one
2564 message (indicated by first_addr being non-NULL) we want to carry on with the
2565 rest of them. Also, it is desirable to send more than one message down the SMTP
2566 connection if there are several waiting, provided we haven't already sent so
2567 many as to hit the configured limit. The function transport_check_waiting looks
2568 for a waiting message and returns its id. Then transport_pass_socket tries to
2569 set up a continued delivery by passing the socket on to another process. The
2570 variable send_rset is FALSE if a message has just been successfully transfered.
2571
2572 If we are already sending down a continued channel, there may be further
2573 addresses not yet delivered that are aimed at the same host, but which have not
2574 been passed in this run of the transport. In this case, continue_more will be
2575 true, and all we should do is send RSET if necessary, and return, leaving the
2576 channel open.
2577
2578 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2579 do not want to continue with other messages down the same channel, because that
2580 can lead to looping between two or more messages, all with the same,
2581 temporarily failing address(es). [The retry information isn't updated yet, so
2582 new processes keep on trying.] We probably also don't want to try more of this
2583 message's addresses either.
2584
2585 If we have started a TLS session, we have to end it before passing the
2586 connection to a new process. However, not all servers can handle this (Exim
2587 can), so we do not pass such a connection on if the host matches
2588 hosts_nopass_tls. */
2589
2590 DEBUG(D_transport)
2591 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2592 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2593 continue_more, yield, (first_addr == NULL)? "":"not ");
2594
2595 if (completed_address && ok && send_quit)
2596 {
2597 BOOL more;
2598 smtp_compare_t t_compare;
2599
2600 t_compare.tblock = tblock;
2601 t_compare.current_sender_address = sender_address;
2602
2603 if ( first_addr != NULL
2604 || continue_more
2605 || ( ( tls_out.active < 0
2606 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2607 )
2608 &&
2609 transport_check_waiting(tblock->name, host->name,
2610 tblock->connection_max_messages, new_message_id, &more,
2611 (oicf)smtp_are_same_identities, (void*)&t_compare)
2612 ) )
2613 {
2614 uschar *msg;
2615 BOOL pass_message;
2616
2617 if (send_rset)
2618 {
2619 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2620 {
2621 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2622 host->address, strerror(save_errno));
2623 send_quit = FALSE;
2624 }
2625 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2626 ob->command_timeout)))
2627 {
2628 int code;
2629 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2630 &pass_message);
2631 if (!send_quit)
2632 {
2633 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2634 host->name, host->address, msg);
2635 }
2636 }
2637 }
2638
2639 /* Either RSET was not needed, or it succeeded */
2640
2641 if (ok)
2642 {
2643 if (first_addr != NULL) /* More addresses still to be sent */
2644 { /* in this run of the transport */
2645 continue_sequence++; /* Causes * in logging */
2646 goto SEND_MESSAGE;
2647 }
2648 if (continue_more) return yield; /* More addresses for another run */
2649
2650 /* Pass the socket to a new Exim process. Before doing so, we must shut
2651 down TLS. Not all MTAs allow for the continuation of the SMTP session
2652 when TLS is shut down. We test for this by sending a new EHLO. If we
2653 don't get a good response, we don't attempt to pass the socket on. */
2654
2655 #ifdef SUPPORT_TLS
2656 if (tls_out.active >= 0)
2657 {
2658 tls_close(FALSE, TRUE);
2659 if (smtps)
2660 ok = FALSE;
2661 else
2662 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2663 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2664 ob->command_timeout);
2665 }
2666 #endif
2667
2668 /* If the socket is successfully passed, we musn't send QUIT (or
2669 indeed anything!) from here. */
2670
2671 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2672 new_message_id, inblock.sock))
2673 {
2674 send_quit = FALSE;
2675 }
2676 }
2677
2678 /* If RSET failed and there are addresses left, they get deferred. */
2679
2680 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2681 }
2682 }
2683
2684 /* End off tidily with QUIT unless the connection has died or the socket has
2685 been passed to another process. There has been discussion on the net about what
2686 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2687 to wait for a response, but on the other hand, there isn't anything one can do
2688 with an error response, other than log it. Exim used to do that. However,
2689 further discussion suggested that it is positively advantageous not to wait for
2690 the response, but to close the session immediately. This is supposed to move
2691 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2692 load from the server. (Hosts that are both servers and clients may not see much
2693 difference, of course.) Further discussion indicated that this was safe to do
2694 on Unix systems which have decent implementations of TCP/IP that leave the
2695 connection around for a while (TIME_WAIT) after the application has gone away.
2696 This enables the response sent by the server to be properly ACKed rather than
2697 timed out, as can happen on broken TCP/IP implementations on other OS.
2698
2699 This change is being made on 31-Jul-98. After over a year of trouble-free
2700 operation, the old commented-out code was removed on 17-Sep-99. */
2701
2702 SEND_QUIT:
2703 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2704
2705 END_OFF:
2706
2707 #ifdef SUPPORT_TLS
2708 tls_close(FALSE, TRUE);
2709 #endif
2710
2711 /* Close the socket, and return the appropriate value, first setting
2712 works because the NULL setting is passed back to the calling process, and
2713 remote_max_parallel is forced to 1 when delivering over an existing connection,
2714
2715 If all went well and continue_more is set, we shouldn't actually get here if
2716 there are further addresses, as the return above will be taken. However,
2717 writing RSET might have failed, or there may be other addresses whose hosts are
2718 specified in the transports, and therefore not visible at top level, in which
2719 case continue_more won't get set. */
2720
2721 (void)close(inblock.sock);
2722
2723 #ifdef EXPERIMENTAL_EVENT
2724 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2725 #endif
2726
2727 continue_transport = NULL;
2728 continue_hostname = NULL;
2729 return yield;
2730 }
2731
2732
2733
2734
2735 /*************************************************
2736 * Closedown entry point *
2737 *************************************************/
2738
2739 /* This function is called when exim is passed an open smtp channel
2740 from another incarnation, but the message which it has been asked
2741 to deliver no longer exists. The channel is on stdin.
2742
2743 We might do fancy things like looking for another message to send down
2744 the channel, but if the one we sought has gone, it has probably been
2745 delivered by some other process that itself will seek further messages,
2746 so just close down our connection.
2747
2748 Argument: pointer to the transport instance block
2749 Returns: nothing
2750 */
2751
2752 void
2753 smtp_transport_closedown(transport_instance *tblock)
2754 {
2755 smtp_transport_options_block *ob =
2756 (smtp_transport_options_block *)(tblock->options_block);
2757 smtp_inblock inblock;
2758 smtp_outblock outblock;
2759 uschar buffer[256];
2760 uschar inbuffer[4096];
2761 uschar outbuffer[16];
2762
2763 inblock.sock = fileno(stdin);
2764 inblock.buffer = inbuffer;
2765 inblock.buffersize = sizeof(inbuffer);
2766 inblock.ptr = inbuffer;
2767 inblock.ptrend = inbuffer;
2768
2769 outblock.sock = inblock.sock;
2770 outblock.buffersize = sizeof(outbuffer);
2771 outblock.buffer = outbuffer;
2772 outblock.ptr = outbuffer;
2773 outblock.cmd_count = 0;
2774 outblock.authenticating = FALSE;
2775
2776 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2777 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2778 ob->command_timeout);
2779 (void)close(inblock.sock);
2780 }
2781
2782
2783
2784 /*************************************************
2785 * Prepare addresses for delivery *
2786 *************************************************/
2787
2788 /* This function is called to flush out error settings from previous delivery
2789 attempts to other hosts. It also records whether we got here via an MX record
2790 or not in the more_errno field of the address. We are interested only in
2791 addresses that are still marked DEFER - others may have got delivered to a
2792 previously considered IP address. Set their status to PENDING_DEFER to indicate
2793 which ones are relevant this time.
2794
2795 Arguments:
2796 addrlist the list of addresses
2797 host the host we are delivering to
2798
2799 Returns: the first address for this delivery
2800 */
2801
2802 static address_item *
2803 prepare_addresses(address_item *addrlist, host_item *host)
2804 {
2805 address_item *first_addr = NULL;
2806 address_item *addr;
2807 for (addr = addrlist; addr != NULL; addr = addr->next)
2808 if (addr->transport_return == DEFER)
2809 {
2810 if (first_addr == NULL) first_addr = addr;
2811 addr->transport_return = PENDING_DEFER;
2812 addr->basic_errno = 0;
2813 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2814 addr->message = NULL;
2815 #ifdef SUPPORT_TLS
2816 addr->cipher = NULL;
2817 addr->ourcert = NULL;
2818 addr->peercert = NULL;
2819 addr->peerdn = NULL;
2820 addr->ocsp = OCSP_NOT_REQ;
2821 #endif
2822 }
2823 return first_addr;
2824 }
2825
2826
2827
2828 /*************************************************
2829 * Main entry point *
2830 *************************************************/
2831
2832 /* See local README for interface details. As this is a remote transport, it is
2833 given a chain of addresses to be delivered in one connection, if possible. It
2834 always returns TRUE, indicating that each address has its own independent
2835 status set, except if there is a setting up problem, in which case it returns
2836 FALSE. */
2837
2838 BOOL
2839 smtp_transport_entry(
2840 transport_instance *tblock, /* data for this instantiation */
2841 address_item *addrlist) /* addresses we are working on */
2842 {
2843 int cutoff_retry;
2844 int port;
2845 int hosts_defer = 0;
2846 int hosts_fail = 0;
2847 int hosts_looked_up = 0;
2848 int hosts_retry = 0;
2849 int hosts_serial = 0;
2850 int hosts_total = 0;
2851 int total_hosts_tried = 0;
2852 address_item *addr;
2853 BOOL expired = TRUE;
2854 BOOL continuing = continue_hostname != NULL;
2855 uschar *expanded_hosts = NULL;
2856 uschar *pistring;
2857 uschar *tid = string_sprintf("%s transport", tblock->name);
2858 smtp_transport_options_block *ob =
2859 (smtp_transport_options_block *)(tblock->options_block);
2860 host_item *hostlist = addrlist->host_list;
2861 host_item *host = NULL;
2862
2863 DEBUG(D_transport)
2864 {
2865 debug_printf("%s transport entered\n", tblock->name);
2866 for (addr = addrlist; addr != NULL; addr = addr->next)
2867 debug_printf(" %s\n", addr->address);
2868 if (continuing) debug_printf("already connected to %s [%s]\n",
2869 continue_hostname, continue_host_address);
2870 }
2871
2872 /* Set the flag requesting that these hosts be added to the waiting
2873 database if the delivery fails temporarily or if we are running with
2874 queue_smtp or a 2-stage queue run. This gets unset for certain
2875 kinds of error, typically those that are specific to the message. */
2876
2877 update_waiting = TRUE;
2878
2879 /* If a host list is not defined for the addresses - they must all have the
2880 same one in order to be passed to a single transport - or if the transport has
2881 a host list with hosts_override set, use the host list supplied with the
2882 transport. It is an error for this not to exist. */
2883
2884 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2885 {
2886 if (ob->hosts == NULL)
2887 {
2888 addrlist->message = string_sprintf("%s transport called with no hosts set",
2889 tblock->name);
2890 addrlist->transport_return = PANIC;
2891 return FALSE; /* Only top address has status */
2892 }
2893
2894 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2895 ob->hosts);
2896
2897 /* If the transport's host list contains no '$' characters, and we are not
2898 randomizing, it is fixed and therefore a chain of hosts can be built once
2899 and for all, and remembered for subsequent use by other calls to this
2900 transport. If, on the other hand, the host list does contain '$', or we are
2901 randomizing its order, we have to rebuild it each time. In the fixed case,
2902 as the hosts string will never be used again, it doesn't matter that we
2903 replace all the : characters with zeros. */
2904
2905 if (ob->hostlist == NULL)
2906 {
2907 uschar *s = ob->hosts;
2908
2909 if (Ustrchr(s, '$') != NULL)
2910 {
2911 if (!(expanded_hosts = expand_string(s)))
2912 {
2913 addrlist->message = string_sprintf("failed to expand list of hosts "
2914 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2915 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2916 return FALSE; /* Only top address has status */
2917 }
2918 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2919 "\"%s\"\n", s, expanded_hosts);
2920 s = expanded_hosts;
2921 }
2922 else
2923 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2924
2925 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2926
2927 /* Check that the expansion yielded something useful. */
2928 if (hostlist == NULL)
2929 {
2930 addrlist->message =
2931 string_sprintf("%s transport has empty hosts setting", tblock->name);
2932 addrlist->transport_return = PANIC;
2933 return FALSE; /* Only top address has status */
2934 }
2935
2936 /* If there was no expansion of hosts, save the host list for
2937 next time. */
2938
2939 if (!expanded_hosts) ob->hostlist = hostlist;
2940 }
2941
2942 /* This is not the first time this transport has been run in this delivery;
2943 the host list was built previously. */
2944
2945 else
2946 hostlist = ob->hostlist;
2947 }
2948
2949 /* The host list was supplied with the address. If hosts_randomize is set, we
2950 must sort it into a random order if it did not come from MX records and has not
2951 already been randomized (but don't bother if continuing down an existing
2952 connection). */
2953
2954 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2955 {
2956 host_item *newlist = NULL;
2957 while (hostlist != NULL)
2958 {
2959 host_item *h = hostlist;
2960 hostlist = hostlist->next;
2961
2962 h->sort_key = random_number(100);
2963
2964 if (newlist == NULL)
2965 {
2966 h->next = NULL;
2967 newlist = h;
2968 }
2969 else if (h->sort_key < newlist->sort_key)
2970 {
2971 h->next = newlist;
2972 newlist = h;
2973 }
2974 else
2975 {
2976 host_item *hh = newlist;
2977 while (hh->next != NULL)
2978 {
2979 if (h->sort_key < hh->next->sort_key) break;
2980 hh = hh->next;
2981 }
2982 h->next = hh->next;
2983 hh->next = h;
2984 }
2985 }
2986
2987 hostlist = addrlist->host_list = newlist;
2988 }
2989
2990 /* Sort out the default port. */
2991
2992 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2993
2994 /* For each host-plus-IP-address on the list:
2995
2996 . If this is a continued delivery and the host isn't the one with the
2997 current connection, skip.
2998
2999 . If the status is unusable (i.e. previously failed or retry checked), skip.
3000
3001 . If no IP address set, get the address, either by turning the name into
3002 an address, calling gethostbyname if gethostbyname is on, or by calling
3003 the DNS. The DNS may yield multiple addresses, in which case insert the
3004 extra ones into the list.
3005
3006 . Get the retry data if not previously obtained for this address and set the
3007 field which remembers the state of this address. Skip if the retry time is
3008 not reached. If not, remember whether retry data was found. The retry string
3009 contains both the name and the IP address.
3010
3011 . Scan the list of addresses and mark those whose status is DEFER as
3012 PENDING_DEFER. These are the only ones that will be processed in this cycle
3013 of the hosts loop.
3014
3015 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3016 Some addresses may be successfully delivered, others may fail, and yet
3017 others may get temporary errors and so get marked DEFER.
3018
3019 . The return from the delivery attempt is OK if a connection was made and a
3020 valid SMTP dialogue was completed. Otherwise it is DEFER.
3021
3022 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3023
3024 . If fail to connect, or other defer state, add a retry item.
3025
3026 . If there are any addresses whose status is still DEFER, carry on to the
3027 next host/IPaddress, unless we have tried the number of hosts given
3028 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3029 there is some fancy logic for hosts_max_try that means its limit can be
3030 overstepped in some circumstances.
3031
3032 If we get to the end of the list, all hosts have deferred at least one address,
3033 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3034 delivery attempt to those hosts whose last try was before the arrival time of
3035 the current message. To cope with this, we have to go round the loop a second
3036 time. After that, set the status and error data for any addresses that haven't
3037 had it set already. */
3038
3039 for (cutoff_retry = 0; expired &&
3040 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3041 cutoff_retry++)
3042 {
3043 host_item *nexthost = NULL;
3044 int unexpired_hosts_tried = 0;
3045
3046 for (host = hostlist;
3047 host != NULL &&
3048 unexpired_hosts_tried < ob->hosts_max_try &&
3049 total_hosts_tried < ob->hosts_max_try_hardlimit;
3050 host = nexthost)
3051 {
3052 int rc;
3053 int host_af;
3054 uschar *rs;
3055 BOOL serialized = FALSE;
3056 BOOL host_is_expired = FALSE;
3057 BOOL message_defer = FALSE;
3058 BOOL ifchanges = FALSE;
3059 BOOL some_deferred = FALSE;
3060 address_item *first_addr = NULL;
3061 uschar *interface = NULL;
3062 uschar *retry_host_key = NULL;
3063 uschar *retry_message_key = NULL;
3064 uschar *serialize_key = NULL;
3065
3066 /* Default next host is next host. :-) But this can vary if the
3067 hosts_max_try limit is hit (see below). It may also be reset if a host
3068 address is looked up here (in case the host was multihomed). */
3069
3070 nexthost = host->next;
3071
3072 /* If the address hasn't yet been obtained from the host name, look it up
3073 now, unless the host is already marked as unusable. If it is marked as
3074 unusable, it means that the router was unable to find its IP address (in
3075 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3076 the lookup failed last time. We don't get this far if *all* MX records
3077 point to non-existent hosts; that is treated as a hard error.
3078
3079 We can just skip this host entirely. When the hosts came from the router,
3080 the address will timeout based on the other host(s); when the address is
3081 looked up below, there is an explicit retry record added.
3082
3083 Note that we mustn't skip unusable hosts if the address is not unset; they
3084 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3085
3086 if (host->address == NULL)
3087 {
3088 int new_port, flags;
3089 host_item *hh;
3090
3091 if (host->status >= hstatus_unusable)
3092 {
3093 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3094 host->name);
3095 continue;
3096 }
3097
3098 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3099
3100 /* The host name is permitted to have an attached port. Find it, and
3101 strip it from the name. Just remember it for now. */
3102
3103 new_port = host_item_get_port(host);
3104
3105 /* Count hosts looked up */
3106
3107 hosts_looked_up++;
3108
3109 /* Find by name if so configured, or if it's an IP address. We don't
3110 just copy the IP address, because we need the test-for-local to happen. */
3111
3112 flags = HOST_FIND_BY_A;
3113 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3114 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3115
3116 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3117 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3118 else
3119 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3120 ob->dnssec_request_domains, ob->dnssec_require_domains,
3121 NULL, NULL);
3122
3123 /* Update the host (and any additional blocks, resulting from
3124 multihoming) with a host-specific port, if any. */
3125
3126 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3127
3128 /* Failure to find the host at this time (usually DNS temporary failure)
3129 is really a kind of routing failure rather than a transport failure.
3130 Therefore we add a retry item of the routing kind, not to stop us trying
3131 to look this name up here again, but to ensure the address gets timed
3132 out if the failures go on long enough. A complete failure at this point
3133 commonly points to a configuration error, but the best action is still
3134 to carry on for the next host. */
3135
3136 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3137 {
3138 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3139 expired = FALSE;
3140 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3141 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3142 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3143 host->status = hstatus_unusable;
3144
3145 for (addr = addrlist; addr != NULL; addr = addr->next)
3146 {
3147 if (addr->transport_return != DEFER) continue;
3148 addr->basic_errno = ERRNO_UNKNOWNHOST;
3149 addr->message =
3150 string_sprintf("failed to lookup IP address for %s", host->name);
3151 }
3152 continue;
3153 }
3154
3155 /* If the host is actually the local host, we may have a problem, or
3156 there may be some cunning configuration going on. In the problem case,
3157 log things and give up. The default transport status is already DEFER. */
3158
3159 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3160 {
3161 for (addr = addrlist; addr != NULL; addr = addr->next)
3162 {
3163 addr->basic_errno = 0;
3164 addr->message = string_sprintf("%s transport found host %s to be "
3165 "local", tblock->name, host->name);
3166 }
3167 goto END_TRANSPORT;
3168 }
3169 } /* End of block for IP address lookup */
3170
3171 /* If this is a continued delivery, we are interested only in the host
3172 which matches the name of the existing open channel. The check is put
3173 here after the local host lookup, in case the name gets expanded as a
3174 result of the lookup. Set expired FALSE, to save the outer loop executing
3175 twice. */
3176
3177 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3178 Ustrcmp(continue_host_address, host->address) != 0))
3179 {
3180 expired = FALSE;
3181 continue; /* With next host */
3182 }
3183
3184 /* Reset the default next host in case a multihomed host whose addresses
3185 are not looked up till just above added to the host list. */
3186
3187 nexthost = host->next;
3188
3189 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3190 domain is in queue_smtp_domains, we don't actually want to attempt any
3191 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3192 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3193 were not in it. We don't want to hold up all SMTP deliveries! Except when
3194 doing a two-stage queue run, don't do this if forcing. */
3195
3196 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3197 match_isinlist(addrlist->domain,
3198 (const uschar **)&queue_smtp_domains, 0,
3199 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3200 {
3201 expired = FALSE;
3202 for (addr = addrlist; addr != NULL; addr = addr->next)
3203 {
3204 if (addr->transport_return != DEFER) continue;
3205 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3206 }
3207 continue; /* With next host */
3208 }
3209
3210 /* Count hosts being considered - purely for an intelligent comment
3211 if none are usable. */
3212
3213 hosts_total++;
3214
3215 /* Set $host and $host address now in case they are needed for the
3216 interface expansion or the serialize_hosts check; they remain set if an
3217 actual delivery happens. */
3218
3219 deliver_host = host->name;
3220 deliver_host_address = host->address;
3221 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3222 : host->dnssec == DS_NO ? US"no"
3223 : US"";
3224
3225 /* Set up a string for adding to the retry key if the port number is not
3226 the standard SMTP port. A host may have its own port setting that overrides
3227 the default. */
3228
3229 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3230 port : host->port);
3231 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3232
3233 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3234 string changes upon expansion, we must add it to the key that is used for
3235 retries, because connections to the same host from a different interface
3236 should be treated separately. */
3237
3238 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3239 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3240 &interface, tid))
3241 return FALSE;
3242 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3243
3244 /* The first time round the outer loop, check the status of the host by
3245 inspecting the retry data. The second time round, we are interested only
3246 in expired hosts that haven't been tried since this message arrived. */
3247
3248 if (cutoff_retry == 0)
3249 {
3250 BOOL incl_ip;
3251 /* Ensure the status of the address is set by checking retry data if
3252 necessary. There may be host-specific retry data (applicable to all
3253 messages) and also data for retries of a specific message at this host.
3254 If either of these retry records are actually read, the keys used are
3255 returned to save recomputing them later. */
3256
3257 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3258 US"retry_include_ip_address", ob->retry_include_ip_address,
3259 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3260 continue; /* with next host */
3261
3262 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3263 incl_ip, &retry_host_key, &retry_message_key);
3264
3265 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3266 (host->address == NULL)? US"" : host->address, pistring,
3267 (host->status == hstatus_usable)? "usable" :
3268 (host->status == hstatus_unusable)? "unusable" :
3269 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3270
3271 /* Skip this address if not usable at this time, noting if it wasn't
3272 actually expired, both locally and in the address. */
3273
3274 switch (host->status)
3275 {
3276 case hstatus_unusable:
3277 expired = FALSE;
3278 setflag(addrlist, af_retry_skipped);
3279 /* Fall through */
3280
3281 case hstatus_unusable_expired:
3282 switch (host->why)
3283 {
3284 case hwhy_retry: hosts_retry++; break;
3285 case hwhy_failed: hosts_fail++; break;
3286 case hwhy_deferred: hosts_defer++; break;
3287 }
3288
3289 /* If there was a retry message key, implying that previously there
3290 was a message-specific defer, we don't want to update the list of
3291 messages waiting for these hosts. */
3292
3293 if (retry_message_key != NULL) update_waiting = FALSE;
3294 continue; /* With the next host or IP address */
3295 }
3296 }
3297
3298 /* Second time round the loop: if the address is set but expired, and
3299 the message is newer than the last try, let it through. */
3300
3301 else
3302 {
3303 if (host->address == NULL ||
3304 host->status != hstatus_unusable_expired ||
3305 host->last_try > received_time)
3306 continue;
3307 DEBUG(D_transport)
3308 debug_printf("trying expired host %s [%s]%s\n",
3309 host->name, host->address, pistring);
3310 host_is_expired = TRUE;
3311 }
3312
3313 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3314 it remains TRUE only if all hosts are expired and none are actually tried.
3315 */
3316
3317 expired = FALSE;
3318
3319 /* If this host is listed as one to which access must be serialized,
3320 see if another Exim process has a connection to it, and if so, skip
3321 this host. If not, update the database to record our connection to it
3322 and remember this for later deletion. Do not do any of this if we are
3323 sending the message down a pre-existing connection. */
3324
3325 if (!continuing &&
3326 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3327 {
3328 serialize_key = string_sprintf("host-serialize-%s", host->name);
3329 if (!enq_start(serialize_key))
3330 {
3331 DEBUG(D_transport)
3332 debug_printf("skipping host %s because another Exim process "
3333 "is connected to it\n", host->name);
3334 hosts_serial++;
3335 continue;
3336 }
3337 serialized = TRUE;
3338 }
3339
3340 /* OK, we have an IP address that is not waiting for its retry time to
3341 arrive (it might be expired) OR (second time round the loop) we have an
3342 expired host that hasn't been tried since the message arrived. Have a go
3343 at delivering the message to it. First prepare the addresses by flushing
3344 out the result of previous attempts, and finding the first address that
3345 is still to be delivered. */
3346
3347 first_addr = prepare_addresses(addrlist, host);
3348
3349 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3350 message_id, host->name, host->address, addrlist->address,
3351 (addrlist->next == NULL)? "" : ", ...");
3352
3353 set_process_info("delivering %s to %s [%s] (%s%s)",
3354 message_id, host->name, host->address, addrlist->address,
3355 (addrlist->next == NULL)? "" : ", ...");
3356
3357 /* This is not for real; don't do the delivery. If there are
3358 any remaining hosts, list them. */
3359
3360 if (dont_deliver)
3361 {
3362 host_item *host2;
3363 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3364 for (addr = addrlist; addr != NULL; addr = addr->next)
3365 {
3366 addr->host_used = host;
3367 addr->special_action = '*';
3368 addr->message = US"delivery bypassed by -N option";
3369 }
3370 DEBUG(D_transport)
3371 {
3372 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3373 "*** host and remaining hosts:\n", tblock->name);
3374 for (host2 = host; host2 != NULL; host2 = host2->next)
3375 debug_printf(" %s [%s]\n", host2->name,
3376 (host2->address == NULL)? US"unset" : host2->address);
3377 }
3378 rc = OK;
3379 }
3380
3381 /* This is for real. If the host is expired, we don't count it for
3382 hosts_max_retry. This ensures that all hosts must expire before an address
3383 is timed out, unless hosts_max_try_hardlimit (which protects against
3384 lunatic DNS configurations) is reached.
3385
3386 If the host is not expired and we are about to hit the hosts_max_retry
3387 limit, check to see if there is a subsequent hosts with a different MX
3388 value. If so, make that the next host, and don't count this one. This is a
3389 heuristic to make sure that different MXs do get tried. With a normal kind
3390 of retry rule, they would get tried anyway when the earlier hosts were
3391 delayed, but if the domain has a "retry every time" type of rule - as is
3392 often used for the the very large ISPs, that won't happen. */
3393
3394 else
3395 {
3396 host_item * thost;
3397 /* Make a copy of the host if it is local to this invocation
3398 of the transport. */
3399
3400 if (expanded_hosts)
3401 {
3402 thost = store_get(sizeof(host_item));
3403 *thost = *host;
3404 thost->name = string_copy(host->name);
3405 thost->address = string_copy(host->address);
3406 }
3407 else
3408 thost = host;
3409
3410 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3411 {
3412 host_item *h;
3413 DEBUG(D_transport)
3414 debug_printf("hosts_max_try limit reached with this host\n");
3415 for (h = host; h != NULL; h = h->next)
3416 if (h->mx != host->mx) break;
3417 if (h != NULL)
3418 {
3419 nexthost = h;
3420 unexpired_hosts_tried--;
3421 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3422 "and will be tried\n");
3423 }
3424 }
3425
3426 /* Attempt the delivery. */
3427
3428 total_hosts_tried++;
3429 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3430 &message_defer, FALSE);
3431
3432 /* Yield is one of:
3433 OK => connection made, each address contains its result;
3434 message_defer is set for message-specific defers (when all
3435 recipients are marked defer)
3436 DEFER => there was a non-message-specific delivery problem;
3437 ERROR => there was a problem setting up the arguments for a filter,
3438 or there was a problem with expanding added headers
3439 */
3440
3441 /* If the result is not OK, there was a non-message-specific problem.
3442 If the result is DEFER, we need to write to the logs saying what happened
3443 for this particular host, except in the case of authentication and TLS
3444 failures, where the log has already been written. If all hosts defer a
3445 general message is written at the end. */
3446
3447 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3448 first_addr->basic_errno != ERRNO_TLSFAILURE)
3449 write_logs(first_addr, host);
3450
3451 #ifdef EXPERIMENTAL_EVENT
3452 if (rc == DEFER)
3453 deferred_event_raise(first_addr, host);
3454 #endif
3455
3456 /* If STARTTLS was accepted, but there was a failure in setting up the
3457 TLS session (usually a certificate screwup), and the host is not in
3458 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3459 TLS forcibly turned off. We have to start from scratch with a new SMTP
3460 connection. That's why the retry is done from here, not from within
3461 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3462 session, so the in-clear transmission after those errors, if permitted,
3463 happens inside smtp_deliver().] */
3464
3465 #ifdef SUPPORT_TLS
3466 if ( rc == DEFER
3467 && first_addr->basic_errno == ERRNO_TLSFAILURE
3468 && ob->tls_tempfail_tryclear
3469 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3470 )
3471 {
3472 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3473 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3474 first_addr = prepare_addresses(addrlist, host);
3475 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3476 &message_defer, TRUE);
3477 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3478 write_logs(first_addr, host);
3479 # ifdef EXPERIMENTAL_EVENT
3480 if (rc == DEFER)
3481 deferred_event_raise(first_addr, host);
3482 # endif
3483 }
3484 #endif /*SUPPORT_TLS*/
3485 }
3486
3487 /* Delivery attempt finished */
3488
3489 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3490 US"ERROR" : US"?";
3491
3492 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3493 message_id, host->name, host->address, addrlist->address,
3494 (addrlist->next == NULL)? "" : " (& others)", rs);
3495
3496 /* Release serialization if set up */
3497
3498 if (serialized) enq_end(serialize_key);
3499
3500 /* If the result is DEFER, or if a host retry record is known to exist, we
3501 need to add an item to the retry chain for updating the retry database
3502 at the end of delivery. We only need to add the item to the top address,
3503 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3504 for any other delivery attempts using the same address. (It is copied into
3505 the unusable tree at the outer level, so even if different address blocks
3506 contain the same address, it still won't get tried again.) */
3507
3508 if (rc == DEFER || retry_host_key != NULL)
3509 {
3510 int delete_flag = (rc != DEFER)? rf_delete : 0;
3511 if (retry_host_key == NULL)
3512 {
3513 BOOL incl_ip;
3514 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3515 US"retry_include_ip_address", ob->retry_include_ip_address,
3516 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3517 incl_ip = TRUE; /* error; use most-specific retry record */
3518
3519 retry_host_key = incl_ip ?
3520 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3521 string_sprintf("T:%S%s", host->name, pistring);
3522 }
3523
3524 /* If a delivery of another message over an existing SMTP connection
3525 yields DEFER, we do NOT set up retry data for the host. This covers the
3526 case when there are delays in routing the addresses in the second message
3527 that are so long that the server times out. This is alleviated by not
3528 routing addresses that previously had routing defers when handling an
3529 existing connection, but even so, this case may occur (e.g. if a
3530 previously happily routed address starts giving routing defers). If the
3531 host is genuinely down, another non-continued message delivery will
3532 notice it soon enough. */
3533
3534 if (delete_flag != 0 || !continuing)
3535 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3536
3537 /* We may have tried an expired host, if its retry time has come; ensure
3538 the status reflects the expiry for the benefit of any other addresses. */
3539
3540 if (rc == DEFER)
3541 {
3542 host->status = (host_is_expired)?
3543 hstatus_unusable_expired : hstatus_unusable;
3544 host->why = hwhy_deferred;
3545 }
3546 }
3547
3548 /* If message_defer is set (host was OK, but every recipient got deferred
3549 because of some message-specific problem), or if that had happened
3550 previously so that a message retry key exists, add an appropriate item
3551 to the retry chain. Note that if there was a message defer but now there is
3552 a host defer, the message defer record gets deleted. That seems perfectly
3553 reasonable. Also, stop the message from being remembered as waiting
3554 for specific hosts. */
3555
3556 if (message_defer || retry_message_key != NULL)
3557 {
3558 int delete_flag = message_defer? 0 : rf_delete;
3559 if (retry_message_key == NULL)
3560 {
3561 BOOL incl_ip;
3562 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3563 US"retry_include_ip_address", ob->retry_include_ip_address,
3564 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3565 incl_ip = TRUE; /* error; use most-specific retry record */
3566
3567 retry_message_key = incl_ip ?
3568 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3569 message_id) :
3570 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3571 }
3572 retry_add_item(addrlist, retry_message_key,
3573 rf_message | rf_host | delete_flag);
3574 update_waiting = FALSE;
3575 }
3576
3577 /* Any return other than DEFER (that is, OK or ERROR) means that the
3578 addresses have got their final statuses filled in for this host. In the OK
3579 case, see if any of them are deferred. */
3580
3581 if (rc == OK)
3582 {
3583 for (addr = addrlist; addr != NULL; addr = addr->next)
3584 {
3585 if (addr->transport_return == DEFER)
3586 {
3587 some_deferred = TRUE;
3588 break;
3589 }
3590 }
3591 }
3592
3593 /* If no addresses deferred or the result was ERROR, return. We do this for
3594 ERROR because a failing filter set-up or add_headers expansion is likely to
3595 fail for any host we try. */
3596
3597 if (rc == ERROR || (rc == OK && !some_deferred))
3598 {
3599 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3600 return TRUE; /* Each address has its status */
3601 }
3602
3603 /* If the result was DEFER or some individual addresses deferred, let
3604 the loop run to try other hosts with the deferred addresses, except for the
3605 case when we were trying to deliver down an existing channel and failed.
3606 Don't try any other hosts in this case. */
3607
3608 if (continuing) break;
3609
3610 /* If the whole delivery, or some individual addresses, were deferred and
3611 there are more hosts that could be tried, do not count this host towards
3612 the hosts_max_try limit if the age of the message is greater than the
3613 maximum retry time for this host. This means we may try try all hosts,
3614 ignoring the limit, when messages have been around for some time. This is
3615 important because if we don't try all hosts, the address will never time
3616 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3617
3618 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3619 {
3620 BOOL timedout;
3621 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3622
3623 if (retry != NULL && retry->rules != NULL)
3624 {
3625 retry_rule *last_rule;
3626 for (last_rule = retry->rules;
3627 last_rule->next != NULL;
3628 last_rule = last_rule->next);
3629 timedout = time(NULL) - received_time > last_rule->timeout;
3630 }
3631 else timedout = TRUE; /* No rule => timed out */
3632
3633 if (timedout)
3634 {
3635 unexpired_hosts_tried--;
3636 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3637 "hosts_max_try (message older than host's retry time)\n");
3638 }
3639 }
3640 } /* End of loop for trying multiple hosts. */
3641
3642 /* This is the end of the loop that repeats iff expired is TRUE and
3643 ob->delay_after_cutoff is FALSE. The second time round we will
3644 try those hosts that haven't been tried since the message arrived. */
3645
3646 DEBUG(D_transport)
3647 {
3648 debug_printf("all IP addresses skipped or deferred at least one address\n");
3649 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3650 debug_printf("retrying IP addresses not tried since message arrived\n");
3651 }
3652 }
3653
3654
3655 /* Get here if all IP addresses are skipped or defer at least one address. In
3656 MUA wrapper mode, this will happen only for connection or other non-message-
3657 specific failures. Force the delivery status for all addresses to FAIL. */
3658
3659 if (mua_wrapper)
3660 {
3661 for (addr = addrlist; addr != NULL; addr = addr->next)
3662 addr->transport_return = FAIL;
3663 goto END_TRANSPORT;
3664 }
3665
3666 /* In the normal, non-wrapper case, add a standard message to each deferred
3667 address if there hasn't been an error, that is, if it hasn't actually been
3668 tried this time. The variable "expired" will be FALSE if any deliveries were
3669 actually tried, or if there was at least one host that was not expired. That
3670 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3671 a delivery has been tried, an error code will be set, and the failing of the
3672 message is handled by the retry code later.
3673
3674 If queue_smtp is set, or this transport was called to send a subsequent message
3675 down an existing TCP/IP connection, and something caused the host not to be
3676 found, we end up here, but can detect these cases and handle them specially. */
3677
3678 for (addr = addrlist; addr != NULL; addr = addr->next)
3679 {
3680 /* If host is not NULL, it means that we stopped processing the host list
3681 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3682 means we need to behave as if some hosts were skipped because their retry
3683 time had not come. Specifically, this prevents the address from timing out.
3684 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3685 hosts were tried. */
3686
3687 if (host != NULL)
3688 {
3689 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3690 {
3691 DEBUG(D_transport)
3692 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3693 "hosts were tried\n");
3694 }
3695 else
3696 {
3697 DEBUG(D_transport)
3698 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3699 setflag(addr, af_retry_skipped);
3700 }
3701 }
3702
3703 if (queue_smtp) /* no deliveries attempted */
3704 {
3705 addr->transport_return = DEFER;
3706 addr->basic_errno = 0;
3707 addr->message = US"SMTP delivery explicitly queued";
3708 }
3709
3710 else if (addr->transport_return == DEFER &&
3711 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3712 addr->message == NULL)
3713 {
3714 addr->basic_errno = ERRNO_HRETRY;
3715 if (continue_hostname != NULL)
3716 {
3717 addr->message = US"no host found for existing SMTP connection";
3718 }
3719 else if (expired)
3720 {
3721 setflag(addr, af_pass_message); /* This is not a security risk */
3722 addr->message = (ob->delay_after_cutoff)?
3723 US"retry time not reached for any host after a long failure period" :
3724 US"all hosts have been failing for a long time and were last tried "
3725 "after this message arrived";
3726
3727 /* If we are already using fallback hosts, or there are no fallback hosts
3728 defined, convert the result to FAIL to cause a bounce. */
3729
3730 if (addr->host_list == addr->fallback_hosts ||
3731 addr->fallback_hosts == NULL)
3732 addr->transport_return = FAIL;
3733 }
3734 else
3735 {
3736 if (hosts_retry == hosts_total)
3737 addr->message = US"retry time not reached for any host";
3738 else if (hosts_fail == hosts_total)
3739 addr->message = US"all host address lookups failed permanently";
3740 else if (hosts_defer == hosts_total)
3741 addr->message = US"all host address lookups failed temporarily";
3742 else if (hosts_serial == hosts_total)
3743 addr->message = US"connection limit reached for all hosts";
3744 else if (hosts_fail+hosts_defer == hosts_total)
3745 addr->message = US"all host address lookups failed";
3746 else addr->message = US"some host address lookups failed and retry time "
3747 "not reached for other hosts or connection limit reached";
3748 }
3749 }
3750 }
3751
3752 /* Update the database which keeps information about which messages are waiting
3753 for which hosts to become available. For some message-specific errors, the
3754 update_waiting flag is turned off because we don't want follow-on deliveries in
3755 those cases. If this transport instance is explicitly limited to one message
3756 per connection then follow-on deliveries are not possible and there's no need
3757 to create/update the per-transport wait-<transport_name> database. */
3758
3759 if (update_waiting && tblock->connection_max_messages != 1)
3760 transport_update_waiting(hostlist, tblock->name);
3761
3762 END_TRANSPORT:
3763
3764 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3765
3766 return TRUE; /* Each address has its status */
3767 }
3768
3769 /* vi: aw ai sw=2
3770 */
3771 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.