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