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Make the retry_include_ip_address smtp transport option expanded. Bug 1545
[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_retry_include_ip_address", opt_stringptr | opt_hidden,
23 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
24
25 { "address_retry_include_sender", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
27 { "allow_localhost", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
29 { "authenticated_sender", opt_stringptr,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
31 { "authenticated_sender_force", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
33 { "command_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, command_timeout) },
35 { "connect_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
37 { "connection_max_messages", opt_int | opt_public,
38 (void *)offsetof(transport_instance, connection_max_messages) },
39 { "data_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, data_timeout) },
41 { "delay_after_cutoff", opt_bool,
42 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
43 #ifndef DISABLE_DKIM
44 { "dkim_canon", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
46 { "dkim_domain", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
48 { "dkim_private_key", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
50 { "dkim_selector", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
52 { "dkim_sign_headers", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
56 #endif
57 { "dns_qualify_single", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
59 { "dns_search_parents", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
61 { "dnssec_request_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
63 { "dnssec_require_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
65 { "dscp", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dscp) },
67 { "fallback_hosts", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
69 { "final_timeout", opt_time,
70 (void *)offsetof(smtp_transport_options_block, final_timeout) },
71 { "gethostbyname", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
73 #ifdef SUPPORT_TLS
74 /* These are no longer honoured, as of Exim 4.80; for now, we silently
75 ignore; 4.83 will warn, and a later-still release will remove
76 these options, so that using them becomes an error. */
77 { "gnutls_require_kx", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
79 { "gnutls_require_mac", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
81 { "gnutls_require_protocols", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
83 #endif
84 { "helo_data", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, helo_data) },
86 { "hosts", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts) },
88 { "hosts_avoid_esmtp", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
90 { "hosts_avoid_pipelining", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
92 #ifdef SUPPORT_TLS
93 { "hosts_avoid_tls", opt_stringptr,
94 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
95 #endif
96 { "hosts_max_try", opt_int,
97 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
98 { "hosts_max_try_hardlimit", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
100 #ifdef SUPPORT_TLS
101 { "hosts_nopass_tls", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
103 #endif
104 { "hosts_override", opt_bool,
105 (void *)offsetof(smtp_transport_options_block, hosts_override) },
106 { "hosts_randomize", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
108 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
109 { "hosts_request_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
111 #endif
112 { "hosts_require_auth", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
114 #ifdef SUPPORT_TLS
115 # ifdef EXPERIMENTAL_DANE
116 { "hosts_require_dane", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
118 # endif
119 # ifndef DISABLE_OCSP
120 { "hosts_require_ocsp", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
122 # endif
123 { "hosts_require_tls", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
125 #endif
126 { "hosts_try_auth", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
128 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
129 { "hosts_try_dane", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
131 #endif
132 #ifndef DISABLE_PRDR
133 { "hosts_try_prdr", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
135 #endif
136 #ifdef SUPPORT_TLS
137 { "hosts_verify_avoid_tls", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
139 #endif
140 { "interface", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, interface) },
142 { "keepalive", opt_bool,
143 (void *)offsetof(smtp_transport_options_block, keepalive) },
144 { "lmtp_ignore_quota", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
146 { "max_rcpt", opt_int | opt_public,
147 (void *)offsetof(transport_instance, max_addresses) },
148 { "multi_domain", opt_bool | opt_public,
149 (void *)offsetof(transport_instance, multi_domain) },
150 { "port", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, port) },
152 { "protocol", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, protocol) },
154 { "retry_include_ip_address", opt_expand_bool,
155 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
156 { "serialize_hosts", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
158 { "size_addition", opt_int,
159 (void *)offsetof(smtp_transport_options_block, size_addition) }
160 #ifdef SUPPORT_TLS
161 ,{ "tls_certificate", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
163 { "tls_crl", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, tls_crl) },
165 { "tls_dh_min_bits", opt_int,
166 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
167 { "tls_privatekey", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
169 { "tls_require_ciphers", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
171 { "tls_sni", opt_stringptr,
172 (void *)offsetof(smtp_transport_options_block, tls_sni) },
173 { "tls_tempfail_tryclear", opt_bool,
174 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
175 { "tls_try_verify_hosts", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
177 #ifdef EXPERIMENTAL_CERTNAMES
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 #endif
181 { "tls_verify_certificates", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
183 { "tls_verify_hosts", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
185 #endif
186 };
187
188 /* Size of the options list. An extern variable has to be used so that its
189 address can appear in the tables drtables.c. */
190
191 int smtp_transport_options_count =
192 sizeof(smtp_transport_options)/sizeof(optionlist);
193
194 /* Default private options block for the smtp transport. */
195
196 smtp_transport_options_block smtp_transport_option_defaults = {
197 NULL, /* hosts */
198 NULL, /* fallback_hosts */
199 NULL, /* hostlist */
200 NULL, /* fallback_hostlist */
201 NULL, /* authenticated_sender */
202 US"$primary_hostname", /* helo_data */
203 NULL, /* interface */
204 NULL, /* port */
205 US"smtp", /* protocol */
206 NULL, /* DSCP */
207 NULL, /* serialize_hosts */
208 NULL, /* hosts_try_auth */
209 NULL, /* hosts_require_auth */
210 #ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
212 NULL, /* hosts_require_dane */
213 #endif
214 #ifndef DISABLE_PRDR
215 NULL, /* hosts_try_prdr */
216 #endif
217 #ifndef DISABLE_OCSP
218 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
219 NULL, /* hosts_require_ocsp */
220 #endif
221 NULL, /* hosts_require_tls */
222 NULL, /* hosts_avoid_tls */
223 US"*", /* hosts_verify_avoid_tls */
224 NULL, /* hosts_avoid_pipelining */
225 NULL, /* hosts_avoid_esmtp */
226 NULL, /* hosts_nopass_tls */
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 NULL, /* dnssec_request_domains */
241 NULL, /* dnssec_require_domains */
242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
246 FALSE, /* lmtp_ignore_quota */
247 NULL, /* expand_retry_include_ip_address */
248 TRUE /* retry_include_ip_address */
249 #ifdef SUPPORT_TLS
250 ,NULL, /* tls_certificate */
251 NULL, /* tls_crl */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
254 NULL, /* gnutls_require_kx */
255 NULL, /* gnutls_require_mac */
256 NULL, /* gnutls_require_proto */
257 NULL, /* tls_sni */
258 NULL, /* tls_verify_certificates */
259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
263 NULL /* tls_try_verify_hosts */
264 # ifdef EXPERIMENTAL_CERTNAMES
265 ,NULL /* tls_verify_cert_hostnames */
266 # endif
267 #endif
268 #ifndef DISABLE_DKIM
269 ,NULL, /* dkim_canon */
270 NULL, /* dkim_domain */
271 NULL, /* dkim_private_key */
272 NULL, /* dkim_selector */
273 NULL, /* dkim_sign_headers */
274 NULL /* dkim_strict */
275 #endif
276 };
277
278 #ifdef EXPERIMENTAL_DSN
279 /* some DSN flags for use later */
280
281 static int rf_list[] = {rf_notify_never, rf_notify_success,
282 rf_notify_failure, rf_notify_delay };
283
284 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
285 #endif
286
287
288
289 /* Local statics */
290
291 static uschar *smtp_command; /* Points to last cmd for error messages */
292 static uschar *mail_command; /* Points to MAIL cmd for error messages */
293 static BOOL update_waiting; /* TRUE to update the "wait" database */
294
295
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
299
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
302
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
306
307 Arguments:
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
314
315 Returns: OK always (FAIL, DEFER not used)
316 */
317
318 static int
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
321 {
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
324
325 errmsg = errmsg; /* Keep picky compilers happy */
326 uid = uid;
327 gid = gid;
328
329 /* Pass back options if required. This interface is getting very messy. */
330
331 if (tf != NULL)
332 {
333 tf->interface = ob->interface;
334 tf->port = ob->port;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
343 }
344
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
347 list. */
348
349 if (!testflag(addrlist, af_local_host_removed))
350 {
351 for (; addrlist != NULL; addrlist = addrlist->next)
352 if (addrlist->fallback_hosts == NULL)
353 addrlist->fallback_hosts = ob->fallback_hostlist;
354 }
355
356 return OK;
357 }
358
359
360
361 /*************************************************
362 * Initialization entry point *
363 *************************************************/
364
365 /* Called for each instance, after its options have been read, to
366 enable consistency checks to be done, or anything else that needs
367 to be set up.
368
369 Argument: pointer to the transport instance block
370 Returns: nothing
371 */
372
373 void
374 smtp_transport_init(transport_instance *tblock)
375 {
376 smtp_transport_options_block *ob =
377 (smtp_transport_options_block *)(tblock->options_block);
378
379 /* Retry_use_local_part defaults FALSE if unset */
380
381 if (tblock->retry_use_local_part == TRUE_UNSET)
382 tblock->retry_use_local_part = FALSE;
383
384 /* Set the default port according to the protocol */
385
386 if (ob->port == NULL)
387 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
388 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
389
390 /* Set up the setup entry point, to be called before subprocesses for this
391 transport. */
392
393 tblock->setup = smtp_transport_setup;
394
395 /* Complain if any of the timeouts are zero. */
396
397 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
398 ob->final_timeout <= 0)
399 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
400 "command, data, or final timeout value is zero for %s transport",
401 tblock->name);
402
403 /* If hosts_override is set and there are local hosts, set the global
404 flag that stops verify from showing router hosts. */
405
406 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
407
408 /* If there are any fallback hosts listed, build a chain of host items
409 for them, but do not do any lookups at this time. */
410
411 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
412
413 #ifdef SUPPORT_TLS
414 if ( ob->gnutls_require_kx
415 || ob->gnutls_require_mac
416 || ob->gnutls_require_proto)
417 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
418 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
419 " are obsolete\n");
420 #endif
421 }
422
423
424
425
426
427 /*************************************************
428 * Set delivery info into all active addresses *
429 *************************************************/
430
431 /* Only addresses whose status is >= PENDING are relevant. A lesser
432 status means that an address is not currently being processed.
433
434 Arguments:
435 addrlist points to a chain of addresses
436 errno_value to put in each address's errno field
437 msg to put in each address's message field
438 rc to put in each address's transport_return field
439 pass_message if TRUE, set the "pass message" flag in the address
440 host if set, mark addrs as having used this host
441
442 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
443 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
444 this particular type of timeout.
445
446 Returns: nothing
447 */
448
449 static void
450 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
451 BOOL pass_message, host_item * host)
452 {
453 address_item *addr;
454 int orvalue = 0;
455 if (errno_value == ERRNO_CONNECTTIMEOUT)
456 {
457 errno_value = ETIMEDOUT;
458 orvalue = RTEF_CTOUT;
459 }
460 for (addr = addrlist; addr != NULL; addr = addr->next)
461 {
462 if (addr->transport_return < PENDING) continue;
463 addr->basic_errno = errno_value;
464 addr->more_errno |= orvalue;
465 if (msg != NULL)
466 {
467 addr->message = msg;
468 if (pass_message) setflag(addr, af_pass_message);
469 }
470 addr->transport_return = rc;
471 if (host)
472 addr->host_used = host;
473 }
474 }
475
476
477
478 /*************************************************
479 * Check an SMTP response *
480 *************************************************/
481
482 /* This function is given an errno code and the SMTP response buffer
483 to analyse, together with the host identification for generating messages. It
484 sets an appropriate message and puts the first digit of the response code into
485 the yield variable. If no response was actually read, a suitable digit is
486 chosen.
487
488 Arguments:
489 host the current host, to get its name for messages
490 errno_value pointer to the errno value
491 more_errno from the top address for use with ERRNO_FILTER_FAIL
492 buffer the SMTP response buffer
493 yield where to put a one-digit SMTP response code
494 message where to put an errror message
495 pass_message set TRUE if message is an SMTP response
496
497 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
498 */
499
500 static BOOL
501 check_response(host_item *host, int *errno_value, int more_errno,
502 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
503 {
504 uschar *pl = US"";
505
506 if (smtp_use_pipelining &&
507 (Ustrcmp(smtp_command, "MAIL") == 0 ||
508 Ustrcmp(smtp_command, "RCPT") == 0 ||
509 Ustrcmp(smtp_command, "DATA") == 0))
510 pl = US"pipelined ";
511
512 *yield = '4'; /* Default setting is to give a temporary error */
513
514 /* Handle response timeout */
515
516 if (*errno_value == ETIMEDOUT)
517 {
518 *message = US string_sprintf("SMTP timeout after %s%s",
519 pl, smtp_command);
520 if (transport_count > 0)
521 *message = US string_sprintf("%s (%d bytes written)", *message,
522 transport_count);
523 return FALSE;
524 }
525
526 /* Handle malformed SMTP response */
527
528 if (*errno_value == ERRNO_SMTPFORMAT)
529 {
530 uschar *malfresp = string_printing(buffer);
531 while (isspace(*malfresp)) malfresp++;
532 *message = *malfresp == 0
533 ? string_sprintf("Malformed SMTP reply (an empty line) "
534 "in response to %s%s", pl, smtp_command)
535 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
536 pl, smtp_command, malfresp);
537 return FALSE;
538 }
539
540 /* Handle a failed filter process error; can't send QUIT as we mustn't
541 end the DATA. */
542
543 if (*errno_value == ERRNO_FILTER_FAIL)
544 {
545 *message = US string_sprintf("transport filter process failed (%d)%s",
546 more_errno,
547 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
548 return FALSE;
549 }
550
551 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
552 end the DATA. */
553
554 if (*errno_value == ERRNO_CHHEADER_FAIL)
555 {
556 *message =
557 US string_sprintf("failed to expand headers_add or headers_remove: %s",
558 expand_string_message);
559 return FALSE;
560 }
561
562 /* Handle failure to write a complete data block */
563
564 if (*errno_value == ERRNO_WRITEINCOMPLETE)
565 {
566 *message = US string_sprintf("failed to write a data block");
567 return FALSE;
568 }
569
570 /* Handle error responses from the remote mailer. */
571
572 if (buffer[0] != 0)
573 {
574 uschar *s = string_printing(buffer);
575 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
576 "%s", pl, smtp_command, s);
577 *pass_message = TRUE;
578 *yield = buffer[0];
579 return TRUE;
580 }
581
582 /* No data was read. If there is no errno, this must be the EOF (i.e.
583 connection closed) case, which causes deferral. An explicit connection reset
584 error has the same effect. Otherwise, put the host's identity in the message,
585 leaving the errno value to be interpreted as well. In all cases, we have to
586 assume the connection is now dead. */
587
588 if (*errno_value == 0 || *errno_value == ECONNRESET)
589 {
590 *errno_value = ERRNO_SMTPCLOSED;
591 *message = US string_sprintf("Remote host closed connection "
592 "in response to %s%s", pl, smtp_command);
593 }
594 else *message = US string_sprintf("%s [%s]", host->name, host->address);
595
596 return FALSE;
597 }
598
599
600
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
604
605 /* This writes to the main log and to the message log.
606
607 Arguments:
608 addr the address item containing error information
609 host the current host
610
611 Returns: nothing
612 */
613
614 static void
615 write_logs(address_item *addr, host_item *host)
616 {
617 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
618
619 if (addr->message)
620 {
621 message = string_sprintf("%s: %s", message, addr->message);
622 if (addr->basic_errno > 0)
623 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
624 log_write(0, LOG_MAIN, "%s", message);
625 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
626 }
627 else
628 {
629 if (log_extra_selector & LX_outgoing_port)
630 message = string_sprintf("%s:%d", message,
631 host->port == PORT_NONE ? 25 : host->port);
632 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
633 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
634 strerror(addr->basic_errno));
635 }
636 }
637
638 static void
639 msglog_line(host_item * host, uschar * message)
640 {
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
643 }
644
645
646
647 #ifdef EXPERIMENTAL_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
651
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
654
655 Arguments:
656 addr the address item containing error information
657 host the current host
658
659 Returns: nothing
660 */
661
662 static void
663 deferred_event_raise(address_item *addr, host_item *host)
664 {
665 uschar * action = addr->transport->event_action;
666 uschar * save_domain;
667 uschar * save_local;
668
669 if (!action)
670 return;
671
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
674
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
679
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
684
685 (void) event_raise(action, US"msg:host:defer",
686 addr->message
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
692 : NULL);
693
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
697 }
698 #endif
699
700
701
702 /*************************************************
703 * Synchronize SMTP responses *
704 *************************************************/
705
706 /* This function is called from smtp_deliver() to receive SMTP responses from
707 the server, and match them up with the commands to which they relate. When
708 PIPELINING is not in use, this function is called after every command, and is
709 therefore somewhat over-engineered, but it is simpler to use a single scheme
710 that works both with and without PIPELINING instead of having two separate sets
711 of code.
712
713 The set of commands that are buffered up with pipelining may start with MAIL
714 and may end with DATA; in between are RCPT commands that correspond to the
715 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
716 etc.) are never buffered.
717
718 Errors after MAIL or DATA abort the whole process leaving the response in the
719 buffer. After MAIL, pending responses are flushed, and the original command is
720 re-instated in big_buffer for error messages. For RCPT commands, the remote is
721 permitted to reject some recipient addresses while accepting others. However
722 certain errors clearly abort the whole process. Set the value in
723 transport_return to PENDING_OK if the address is accepted. If there is a
724 subsequent general error, it will get reset accordingly. If not, it will get
725 converted to OK at the end.
726
727 Arguments:
728 addrlist the complete address list
729 include_affixes TRUE if affixes include in RCPT
730 sync_addr ptr to the ptr of the one to start scanning at (updated)
731 host the host we are connected to
732 count the number of responses to read
733 address_retry_
734 include_sender true if 4xx retry is to include the sender it its key
735 pending_MAIL true if the first response is for MAIL
736 pending_DATA 0 if last command sent was not DATA
737 +1 if previously had a good recipient
738 -1 if not previously had a good recipient
739 inblock incoming SMTP block
740 timeout timeout value
741 buffer buffer for reading response
742 buffsize size of buffer
743
744 Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
751 */
752
753 static int
754 sync_responses(address_item *addrlist, BOOL include_affixes,
755 address_item **sync_addr, host_item *host, int count,
756 BOOL address_retry_include_sender, BOOL pending_MAIL,
757 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
758 int buffsize)
759 {
760 address_item *addr = *sync_addr;
761 int yield = 0;
762
763 /* Handle the response for a MAIL command. On error, reinstate the original
764 command in big_buffer for error message use, and flush any further pending
765 responses before returning, except after I/O errors and timeouts. */
766
767 if (pending_MAIL)
768 {
769 count--;
770 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
771 {
772 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
773 if (errno == 0 && buffer[0] != 0)
774 {
775 uschar flushbuffer[4096];
776 int save_errno = 0;
777 if (buffer[0] == '4')
778 {
779 save_errno = ERRNO_MAIL4XX;
780 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
781 }
782 while (count-- > 0)
783 {
784 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
785 '2', timeout)
786 && (errno != 0 || flushbuffer[0] == 0))
787 break;
788 }
789 errno = save_errno;
790 }
791
792 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 while (count-- > 0) /* Mark any pending addrs with the host used */
794 {
795 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
796 addr->host_used = host;
797 addr = addr->next;
798 }
799 return -3;
800 }
801 }
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804
805 /* Read and handle the required number of RCPT responses, matching each one up
806 with an address by scanning for the next address whose status is PENDING_DEFER.
807 */
808
809 while (count-- > 0)
810 {
811 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
812
813 /* The address was accepted */
814 addr->host_used = host;
815
816 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
817 {
818 yield |= 1;
819 addr->transport_return = PENDING_OK;
820
821 /* If af_dr_retry_exists is set, there was a routing delay on this address;
822 ensure that any address-specific retry record is expunged. We do this both
823 for the basic key and for the version that also includes the sender. */
824
825 if (testflag(addr, af_dr_retry_exists))
826 {
827 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
828 sender_address);
829 retry_add_item(addr, altkey, rf_delete);
830 retry_add_item(addr, addr->address_retry_key, rf_delete);
831 }
832 }
833
834 /* Timeout while reading the response */
835
836 else if (errno == ETIMEDOUT)
837 {
838 int save_errno = errno;
839 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
840 transport_rcpt_address(addr, include_affixes));
841 set_errno(addrlist, save_errno, message, DEFER, FALSE, NULL);
842 retry_add_item(addr, addr->address_retry_key, 0);
843 update_waiting = FALSE;
844 return -1;
845 }
846
847 /* Handle other errors in obtaining an SMTP response by returning -1. This
848 will cause all the addresses to be deferred. Restore the SMTP command in
849 big_buffer for which we are checking the response, so the error message
850 makes sense. */
851
852 else if (errno != 0 || buffer[0] == 0)
853 {
854 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
855 transport_rcpt_address(addr, include_affixes));
856 return -2;
857 }
858
859 /* Handle SMTP permanent and temporary response codes. */
860
861 else
862 {
863 addr->message =
864 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
865 "%s", transport_rcpt_address(addr, include_affixes),
866 string_printing(buffer));
867 setflag(addr, af_pass_message);
868 msglog_line(host, addr->message);
869
870 /* The response was 5xx */
871
872 if (buffer[0] == '5')
873 {
874 addr->transport_return = FAIL;
875 yield |= 2;
876 }
877
878 /* The response was 4xx */
879
880 else
881 {
882 addr->transport_return = DEFER;
883 addr->basic_errno = ERRNO_RCPT4XX;
884 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
885
886 /* Log temporary errors if there are more hosts to be tried.
887 If not, log this last one in the == line. */
888
889 if (host->next)
890 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
891
892 /* Do not put this message on the list of those waiting for specific
893 hosts, as otherwise it is likely to be tried too often. */
894
895 update_waiting = FALSE;
896
897 /* Add a retry item for the address so that it doesn't get tried again
898 too soon. If address_retry_include_sender is true, add the sender address
899 to the retry key. */
900
901 if (address_retry_include_sender)
902 {
903 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
904 sender_address);
905 retry_add_item(addr, altkey, 0);
906 }
907 else retry_add_item(addr, addr->address_retry_key, 0);
908 }
909 }
910 } /* Loop for next RCPT response */
911
912 /* Update where to start at for the next block of responses, unless we
913 have already handled all the addresses. */
914
915 if (addr != NULL) *sync_addr = addr->next;
916
917 /* Handle a response to DATA. If we have not had any good recipients, either
918 previously or in this block, the response is ignored. */
919
920 if (pending_DATA != 0 &&
921 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
922 {
923 int code;
924 uschar *msg;
925 BOOL pass_message;
926 if (pending_DATA > 0 || (yield & 1) != 0)
927 {
928 if (errno == 0 && buffer[0] == '4')
929 {
930 errno = ERRNO_DATA4XX;
931 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
932 }
933 return -3;
934 }
935 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
936 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
937 "is in use and there were no good recipients\n", msg);
938 }
939
940 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
941 present) received 3xx. If any RCPTs were handled and yielded anything other
942 than 4xx, yield will be set non-zero. */
943
944 return yield;
945 }
946
947
948
949 /* Do the client side of smtp-level authentication */
950 /*
951 Arguments:
952 buffer EHLO response from server (gets overwritten)
953 addrlist chain of potential addresses to deliver
954 host host to deliver to
955 ob transport options
956 ibp, obp comms channel control blocks
957
958 Returns:
959 OK Success, or failed (but not required): global "smtp_authenticated" set
960 DEFER Failed authentication (and was required)
961 ERROR Internal problem
962
963 FAIL_SEND Failed communications - transmit
964 FAIL - response
965 */
966
967 int
968 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
969 smtp_transport_options_block *ob, BOOL is_esmtp,
970 smtp_inblock *ibp, smtp_outblock *obp)
971 {
972 int require_auth;
973 uschar *fail_reason = US"server did not advertise AUTH support";
974
975 smtp_authenticated = FALSE;
976 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
977 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
978 host->name, host->address, NULL);
979
980 if (is_esmtp && !regex_AUTH) regex_AUTH =
981 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
982 FALSE, TRUE);
983
984 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
985 {
986 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
987 expand_nmax = -1; /* reset */
988
989 /* Must not do this check until after we have saved the result of the
990 regex match above. */
991
992 if (require_auth == OK ||
993 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
994 host->address, NULL) == OK)
995 {
996 auth_instance *au;
997 fail_reason = US"no common mechanisms were found";
998
999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1000
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1005 */
1006
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1008 {
1009 uschar *p = names;
1010 if (!au->client ||
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1014 {
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1016 au->name,
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1019 continue;
1020 }
1021
1022 /* Loop to scan supported server mechanisms */
1023
1024 while (*p != 0)
1025 {
1026 int rc;
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
1029
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1032 {
1033 while (*p != 0 && !isspace(*p)) p++;
1034 continue;
1035 }
1036
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
1040
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1047 au->name, rc);
1048
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
1053
1054 switch(rc)
1055 {
1056 case OK:
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1061 break;
1062
1063 /* Failure after writing a command */
1064
1065 case FAIL_SEND:
1066 return FAIL_SEND;
1067
1068 /* Failure after reading a response */
1069
1070 case FAIL:
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1074 break;
1075
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1081
1082 case CANCELLED:
1083 if (*buffer != 0)
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1087 break;
1088
1089 /* Internal problem, message in buffer. */
1090
1091 case ERROR:
1092 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE, NULL);
1093 return ERROR;
1094 }
1095
1096 break; /* If not authenticated, try next authenticator */
1097 } /* Loop for scanning supported server mechanisms */
1098 } /* Loop for further authenticators */
1099 }
1100 }
1101
1102 /* If we haven't authenticated, but are required to, give up. */
1103
1104 if (require_auth == OK && !smtp_authenticated)
1105 {
1106 set_errno(addrlist, ERRNO_AUTHFAIL,
1107 string_sprintf("authentication required but %s", fail_reason), DEFER,
1108 FALSE, NULL);
1109 return DEFER;
1110 }
1111
1112 return OK;
1113 }
1114
1115
1116 /* Construct AUTH appendix string for MAIL TO */
1117 /*
1118 Arguments
1119 buffer to build string
1120 addrlist chain of potential addresses to deliver
1121 ob transport options
1122
1123 Globals smtp_authenticated
1124 client_authenticated_sender
1125 Return True on error, otherwise buffer has (possibly empty) terminated string
1126 */
1127
1128 BOOL
1129 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1130 smtp_transport_options_block *ob)
1131 {
1132 uschar *local_authenticated_sender = authenticated_sender;
1133
1134 #ifdef notdef
1135 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1136 #endif
1137
1138 if (ob->authenticated_sender != NULL)
1139 {
1140 uschar *new = expand_string(ob->authenticated_sender);
1141 if (new == NULL)
1142 {
1143 if (!expand_string_forcedfail)
1144 {
1145 uschar *message = string_sprintf("failed to expand "
1146 "authenticated_sender: %s", expand_string_message);
1147 set_errno(addrlist, 0, message, DEFER, FALSE, NULL);
1148 return TRUE;
1149 }
1150 }
1151 else if (new[0] != 0) local_authenticated_sender = new;
1152 }
1153
1154 /* Add the authenticated sender address if present */
1155
1156 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1157 local_authenticated_sender != NULL)
1158 {
1159 string_format(buffer, bufsize, " AUTH=%s",
1160 auth_xtextencode(local_authenticated_sender,
1161 Ustrlen(local_authenticated_sender)));
1162 client_authenticated_sender = string_copy(local_authenticated_sender);
1163 }
1164 else
1165 *buffer= 0;
1166
1167 return FALSE;
1168 }
1169
1170
1171
1172 #ifdef EXPERIMENTAL_DANE
1173 int
1174 tlsa_lookup(host_item * host, dns_answer * dnsa,
1175 BOOL dane_required, BOOL * dane)
1176 {
1177 /* move this out to host.c given the similarity to dns_lookup() ? */
1178 uschar buffer[300];
1179 uschar * fullname = buffer;
1180
1181 /* TLSA lookup string */
1182 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1183
1184 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1185 {
1186 case DNS_AGAIN:
1187 return DEFER; /* just defer this TLS'd conn */
1188
1189 default:
1190 case DNS_FAIL:
1191 if (dane_required)
1192 {
1193 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1194 return FAIL;
1195 }
1196 break;
1197
1198 case DNS_SUCCEED:
1199 if (!dns_is_secure(dnsa))
1200 {
1201 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1202 return DEFER;
1203 }
1204 *dane = TRUE;
1205 break;
1206 }
1207 return OK;
1208 }
1209 #endif
1210
1211
1212 /*************************************************
1213 * Deliver address list to given host *
1214 *************************************************/
1215
1216 /* If continue_hostname is not null, we get here only when continuing to
1217 deliver down an existing channel. The channel was passed as the standard
1218 input. TLS is never active on a passed channel; the previous process always
1219 closes it down before passing the connection on.
1220
1221 Otherwise, we have to make a connection to the remote host, and do the
1222 initial protocol exchange.
1223
1224 When running as an MUA wrapper, if the sender or any recipient is rejected,
1225 temporarily or permanently, we force failure for all recipients.
1226
1227 Arguments:
1228 addrlist chain of potential addresses to deliver; only those whose
1229 transport_return field is set to PENDING_DEFER are currently
1230 being processed; others should be skipped - they have either
1231 been delivered to an earlier host or IP address, or been
1232 failed by one of them.
1233 host host to deliver to
1234 host_af AF_INET or AF_INET6
1235 port default TCP/IP port to use, in host byte order
1236 interface interface to bind to, or NULL
1237 tblock transport instance block
1238 copy_host TRUE if host set in addr->host_used must be copied, because
1239 it is specific to this call of the transport
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, BOOL copy_host,
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 host_item *thost;
2213 uschar *conf = NULL;
2214 send_rset = FALSE;
2215
2216 /* Make a copy of the host if it is local to this invocation
2217 of the transport. */
2218
2219 if (copy_host)
2220 {
2221 thost = store_get(sizeof(host_item));
2222 *thost = *host;
2223 thost->name = string_copy(host->name);
2224 thost->address = string_copy(host->address);
2225 }
2226 else thost = host;
2227
2228 /* Set up confirmation if needed - applies only to SMTP */
2229
2230 if (
2231 #ifndef EXPERIMENTAL_EVENT
2232 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2233 #endif
2234 !lmtp
2235 )
2236 {
2237 uschar *s = string_printing(buffer);
2238 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2239 }
2240
2241 /* Process all transported addresses - for LMTP or PRDR, read a status for
2242 each one. */
2243
2244 for (addr = addrlist; addr != first_addr; addr = addr->next)
2245 {
2246 if (addr->transport_return != PENDING_OK) continue;
2247
2248 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2249 remaining addresses. Otherwise, it's a return code for just the one
2250 address. For temporary errors, add a retry item for the address so that
2251 it doesn't get tried again too soon. */
2252
2253 #ifndef DISABLE_PRDR
2254 if (lmtp || prdr_active)
2255 #else
2256 if (lmtp)
2257 #endif
2258 {
2259 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2260 ob->final_timeout))
2261 {
2262 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2263 addr->message = string_sprintf(
2264 #ifndef DISABLE_PRDR
2265 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2266 #else
2267 "LMTP error after %s: %s",
2268 #endif
2269 big_buffer, string_printing(buffer));
2270 setflag(addr, af_pass_message); /* Allow message to go to user */
2271 if (buffer[0] == '5')
2272 addr->transport_return = FAIL;
2273 else
2274 {
2275 errno = ERRNO_DATA4XX;
2276 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2277 addr->transport_return = DEFER;
2278 #ifndef DISABLE_PRDR
2279 if (!prdr_active)
2280 #endif
2281 retry_add_item(addr, addr->address_retry_key, 0);
2282 }
2283 continue;
2284 }
2285 completed_address = TRUE; /* NOW we can set this flag */
2286 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2287 {
2288 uschar *s = string_printing(buffer);
2289 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2290 }
2291 }
2292
2293 /* SMTP, or success return from LMTP for this address. Pass back the
2294 actual host that was used. */
2295
2296 addr->transport_return = OK;
2297 addr->more_errno = delivery_time;
2298 addr->host_used = thost;
2299 addr->special_action = flag;
2300 addr->message = conf;
2301 #ifndef DISABLE_PRDR
2302 if (prdr_active) addr->flags |= af_prdr_used;
2303 #endif
2304 flag = '-';
2305
2306 #ifndef DISABLE_PRDR
2307 if (!prdr_active)
2308 #endif
2309 {
2310 /* Update the journal. For homonymic addresses, use the base address plus
2311 the transport name. See lots of comments in deliver.c about the reasons
2312 for the complications when homonyms are involved. Just carry on after
2313 write error, as it may prove possible to update the spool file later. */
2314
2315 if (testflag(addr, af_homonym))
2316 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2317 else
2318 sprintf(CS buffer, "%.500s\n", addr->unique);
2319
2320 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2321 len = Ustrlen(CS buffer);
2322 if (write(journal_fd, buffer, len) != len)
2323 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2324 "%s: %s", buffer, strerror(errno));
2325 }
2326 }
2327
2328 #ifndef DISABLE_PRDR
2329 if (prdr_active)
2330 {
2331 /* PRDR - get the final, overall response. For any non-success
2332 upgrade all the address statuses. */
2333 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2334 ob->final_timeout);
2335 if (!ok)
2336 {
2337 if(errno == 0 && buffer[0] == '4')
2338 {
2339 errno = ERRNO_DATA4XX;
2340 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2341 }
2342 for (addr = addrlist; addr != first_addr; addr = addr->next)
2343 if (buffer[0] == '5' || addr->transport_return == OK)
2344 addr->transport_return = PENDING_OK; /* allow set_errno action */
2345 goto RESPONSE_FAILED;
2346 }
2347
2348 /* Update the journal, or setup retry. */
2349 for (addr = addrlist; addr != first_addr; addr = addr->next)
2350 if (addr->transport_return == OK)
2351 {
2352 if (testflag(addr, af_homonym))
2353 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2354 else
2355 sprintf(CS buffer, "%.500s\n", addr->unique);
2356
2357 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2358 len = Ustrlen(CS buffer);
2359 if (write(journal_fd, buffer, len) != len)
2360 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2361 "%s: %s", buffer, strerror(errno));
2362 }
2363 else if (addr->transport_return == DEFER)
2364 retry_add_item(addr, addr->address_retry_key, -2);
2365 }
2366 #endif
2367
2368 /* Ensure the journal file is pushed out to disk. */
2369
2370 if (EXIMfsync(journal_fd) < 0)
2371 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2372 strerror(errno));
2373 }
2374 }
2375
2376
2377 /* Handle general (not specific to one address) failures here. The value of ok
2378 is used to skip over this code on the falling through case. A timeout causes a
2379 deferral. Other errors may defer or fail according to the response code, and
2380 may set up a special errno value, e.g. after connection chopped, which is
2381 assumed if errno == 0 and there is no text in the buffer. If control reaches
2382 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2383 the problem is not related to this specific message. */
2384
2385 if (!ok)
2386 {
2387 int code;
2388
2389 RESPONSE_FAILED:
2390 save_errno = errno;
2391 message = NULL;
2392 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2393 buffer, &code, &message, &pass_message);
2394 goto FAILED;
2395
2396 SEND_FAILED:
2397 save_errno = errno;
2398 code = '4';
2399 message = US string_sprintf("send() to %s [%s] failed: %s",
2400 host->name, host->address, strerror(save_errno));
2401 send_quit = FALSE;
2402 goto FAILED;
2403
2404 /* This label is jumped to directly when a TLS negotiation has failed,
2405 or was not done for a host for which it is required. Values will be set
2406 in message and save_errno, and setting_up will always be true. Treat as
2407 a temporary error. */
2408
2409 #ifdef SUPPORT_TLS
2410 TLS_FAILED:
2411 code = '4';
2412 #endif
2413
2414 /* If the failure happened while setting up the call, see if the failure was
2415 a 5xx response (this will either be on connection, or following HELO - a 5xx
2416 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2417 never going to accept them. For other errors during setting up (timeouts or
2418 whatever), defer all addresses, and yield DEFER, so that the host is not
2419 tried again for a while. */
2420
2421 FAILED:
2422 ok = FALSE; /* For when reached by GOTO */
2423
2424 if (setting_up)
2425 {
2426 if (code == '5')
2427 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2428 else
2429 {
2430 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2431 yield = DEFER;
2432 }
2433 }
2434
2435 /* We want to handle timeouts after MAIL or "." and loss of connection after
2436 "." specially. They can indicate a problem with the sender address or with
2437 the contents of the message rather than a real error on the connection. These
2438 cases are treated in the same way as a 4xx response. This next bit of code
2439 does the classification. */
2440
2441 else
2442 {
2443 BOOL message_error;
2444
2445 switch(save_errno)
2446 {
2447 case 0:
2448 case ERRNO_MAIL4XX:
2449 case ERRNO_DATA4XX:
2450 message_error = TRUE;
2451 break;
2452
2453 case ETIMEDOUT:
2454 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2455 Ustrncmp(smtp_command,"end ",4) == 0;
2456 break;
2457
2458 case ERRNO_SMTPCLOSED:
2459 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2460 break;
2461
2462 default:
2463 message_error = FALSE;
2464 break;
2465 }
2466
2467 /* Handle the cases that are treated as message errors. These are:
2468
2469 (a) negative response or timeout after MAIL
2470 (b) negative response after DATA
2471 (c) negative response or timeout or dropped connection after "."
2472
2473 It won't be a negative response or timeout after RCPT, as that is dealt
2474 with separately above. The action in all cases is to set an appropriate
2475 error code for all the addresses, but to leave yield set to OK because the
2476 host itself has not failed. Of course, it might in practice have failed
2477 when we've had a timeout, but if so, we'll discover that at the next
2478 delivery attempt. For a temporary error, set the message_defer flag, and
2479 write to the logs for information if this is not the last host. The error
2480 for the last host will be logged as part of the address's log line. */
2481
2482 if (message_error)
2483 {
2484 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2485 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2486 pass_message, host);
2487
2488 /* If there's an errno, the message contains just the identity of
2489 the host. */
2490
2491 if (code != '5') /* Anything other than 5 is treated as temporary */
2492 {
2493 if (save_errno > 0)
2494 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2495 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2496 msglog_line(host, message);
2497 *message_defer = TRUE;
2498 }
2499 }
2500
2501 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2502 ".", or some other transportation error. We defer all addresses and yield
2503 DEFER, except for the case of failed add_headers expansion, or a transport
2504 filter failure, when the yield should be ERROR, to stop it trying other
2505 hosts. */
2506
2507 else
2508 {
2509 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2510 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2511 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2512 }
2513 }
2514 }
2515
2516
2517 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2518 SMTP session tidily. However, if there were too many addresses to send in one
2519 message (indicated by first_addr being non-NULL) we want to carry on with the
2520 rest of them. Also, it is desirable to send more than one message down the SMTP
2521 connection if there are several waiting, provided we haven't already sent so
2522 many as to hit the configured limit. The function transport_check_waiting looks
2523 for a waiting message and returns its id. Then transport_pass_socket tries to
2524 set up a continued delivery by passing the socket on to another process. The
2525 variable send_rset is FALSE if a message has just been successfully transfered.
2526
2527 If we are already sending down a continued channel, there may be further
2528 addresses not yet delivered that are aimed at the same host, but which have not
2529 been passed in this run of the transport. In this case, continue_more will be
2530 true, and all we should do is send RSET if necessary, and return, leaving the
2531 channel open.
2532
2533 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2534 do not want to continue with other messages down the same channel, because that
2535 can lead to looping between two or more messages, all with the same,
2536 temporarily failing address(es). [The retry information isn't updated yet, so
2537 new processes keep on trying.] We probably also don't want to try more of this
2538 message's addresses either.
2539
2540 If we have started a TLS session, we have to end it before passing the
2541 connection to a new process. However, not all servers can handle this (Exim
2542 can), so we do not pass such a connection on if the host matches
2543 hosts_nopass_tls. */
2544
2545 DEBUG(D_transport)
2546 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2547 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2548 continue_more, yield, (first_addr == NULL)? "":"not ");
2549
2550 if (completed_address && ok && send_quit)
2551 {
2552 BOOL more;
2553 if (first_addr != NULL || continue_more ||
2554 (
2555 (tls_out.active < 0 ||
2556 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2557 host->address, NULL) != OK)
2558 &&
2559 transport_check_waiting(tblock->name, host->name,
2560 tblock->connection_max_messages, new_message_id, &more)
2561 ))
2562 {
2563 uschar *msg;
2564 BOOL pass_message;
2565
2566 if (send_rset)
2567 {
2568 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2569 {
2570 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2571 host->address, strerror(save_errno));
2572 send_quit = FALSE;
2573 }
2574 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2575 ob->command_timeout)))
2576 {
2577 int code;
2578 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2579 &pass_message);
2580 if (!send_quit)
2581 {
2582 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2583 host->name, host->address, msg);
2584 }
2585 }
2586 }
2587
2588 /* Either RSET was not needed, or it succeeded */
2589
2590 if (ok)
2591 {
2592 if (first_addr != NULL) /* More addresses still to be sent */
2593 { /* in this run of the transport */
2594 continue_sequence++; /* Causes * in logging */
2595 goto SEND_MESSAGE;
2596 }
2597 if (continue_more) return yield; /* More addresses for another run */
2598
2599 /* Pass the socket to a new Exim process. Before doing so, we must shut
2600 down TLS. Not all MTAs allow for the continuation of the SMTP session
2601 when TLS is shut down. We test for this by sending a new EHLO. If we
2602 don't get a good response, we don't attempt to pass the socket on. */
2603
2604 #ifdef SUPPORT_TLS
2605 if (tls_out.active >= 0)
2606 {
2607 tls_close(FALSE, TRUE);
2608 if (smtps)
2609 ok = FALSE;
2610 else
2611 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2612 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2613 ob->command_timeout);
2614 }
2615 #endif
2616
2617 /* If the socket is successfully passed, we musn't send QUIT (or
2618 indeed anything!) from here. */
2619
2620 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2621 new_message_id, inblock.sock))
2622 {
2623 send_quit = FALSE;
2624 }
2625 }
2626
2627 /* If RSET failed and there are addresses left, they get deferred. */
2628
2629 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2630 }
2631 }
2632
2633 /* End off tidily with QUIT unless the connection has died or the socket has
2634 been passed to another process. There has been discussion on the net about what
2635 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2636 to wait for a response, but on the other hand, there isn't anything one can do
2637 with an error response, other than log it. Exim used to do that. However,
2638 further discussion suggested that it is positively advantageous not to wait for
2639 the response, but to close the session immediately. This is supposed to move
2640 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2641 load from the server. (Hosts that are both servers and clients may not see much
2642 difference, of course.) Further discussion indicated that this was safe to do
2643 on Unix systems which have decent implementations of TCP/IP that leave the
2644 connection around for a while (TIME_WAIT) after the application has gone away.
2645 This enables the response sent by the server to be properly ACKed rather than
2646 timed out, as can happen on broken TCP/IP implementations on other OS.
2647
2648 This change is being made on 31-Jul-98. After over a year of trouble-free
2649 operation, the old commented-out code was removed on 17-Sep-99. */
2650
2651 SEND_QUIT:
2652 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2653
2654 END_OFF:
2655
2656 #ifdef SUPPORT_TLS
2657 tls_close(FALSE, TRUE);
2658 #endif
2659
2660 /* Close the socket, and return the appropriate value, first setting
2661 works because the NULL setting is passed back to the calling process, and
2662 remote_max_parallel is forced to 1 when delivering over an existing connection,
2663
2664 If all went well and continue_more is set, we shouldn't actually get here if
2665 there are further addresses, as the return above will be taken. However,
2666 writing RSET might have failed, or there may be other addresses whose hosts are
2667 specified in the transports, and therefore not visible at top level, in which
2668 case continue_more won't get set. */
2669
2670 (void)close(inblock.sock);
2671
2672 #ifdef EXPERIMENTAL_EVENT
2673 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2674 #endif
2675
2676 continue_transport = NULL;
2677 continue_hostname = NULL;
2678 return yield;
2679 }
2680
2681
2682
2683
2684 /*************************************************
2685 * Closedown entry point *
2686 *************************************************/
2687
2688 /* This function is called when exim is passed an open smtp channel
2689 from another incarnation, but the message which it has been asked
2690 to deliver no longer exists. The channel is on stdin.
2691
2692 We might do fancy things like looking for another message to send down
2693 the channel, but if the one we sought has gone, it has probably been
2694 delivered by some other process that itself will seek further messages,
2695 so just close down our connection.
2696
2697 Argument: pointer to the transport instance block
2698 Returns: nothing
2699 */
2700
2701 void
2702 smtp_transport_closedown(transport_instance *tblock)
2703 {
2704 smtp_transport_options_block *ob =
2705 (smtp_transport_options_block *)(tblock->options_block);
2706 smtp_inblock inblock;
2707 smtp_outblock outblock;
2708 uschar buffer[256];
2709 uschar inbuffer[4096];
2710 uschar outbuffer[16];
2711
2712 inblock.sock = fileno(stdin);
2713 inblock.buffer = inbuffer;
2714 inblock.buffersize = sizeof(inbuffer);
2715 inblock.ptr = inbuffer;
2716 inblock.ptrend = inbuffer;
2717
2718 outblock.sock = inblock.sock;
2719 outblock.buffersize = sizeof(outbuffer);
2720 outblock.buffer = outbuffer;
2721 outblock.ptr = outbuffer;
2722 outblock.cmd_count = 0;
2723 outblock.authenticating = FALSE;
2724
2725 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2726 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2727 ob->command_timeout);
2728 (void)close(inblock.sock);
2729 }
2730
2731
2732
2733 /*************************************************
2734 * Prepare addresses for delivery *
2735 *************************************************/
2736
2737 /* This function is called to flush out error settings from previous delivery
2738 attempts to other hosts. It also records whether we got here via an MX record
2739 or not in the more_errno field of the address. We are interested only in
2740 addresses that are still marked DEFER - others may have got delivered to a
2741 previously considered IP address. Set their status to PENDING_DEFER to indicate
2742 which ones are relevant this time.
2743
2744 Arguments:
2745 addrlist the list of addresses
2746 host the host we are delivering to
2747
2748 Returns: the first address for this delivery
2749 */
2750
2751 static address_item *
2752 prepare_addresses(address_item *addrlist, host_item *host)
2753 {
2754 address_item *first_addr = NULL;
2755 address_item *addr;
2756 for (addr = addrlist; addr != NULL; addr = addr->next)
2757 {
2758 if (addr->transport_return != DEFER) continue;
2759 if (first_addr == NULL) first_addr = addr;
2760 addr->transport_return = PENDING_DEFER;
2761 addr->basic_errno = 0;
2762 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2763 addr->message = NULL;
2764 #ifdef SUPPORT_TLS
2765 addr->cipher = NULL;
2766 addr->ourcert = NULL;
2767 addr->peercert = NULL;
2768 addr->peerdn = NULL;
2769 addr->ocsp = OCSP_NOT_REQ;
2770 #endif
2771 }
2772 return first_addr;
2773 }
2774
2775
2776
2777 /*************************************************
2778 * Main entry point *
2779 *************************************************/
2780
2781 /* See local README for interface details. As this is a remote transport, it is
2782 given a chain of addresses to be delivered in one connection, if possible. It
2783 always returns TRUE, indicating that each address has its own independent
2784 status set, except if there is a setting up problem, in which case it returns
2785 FALSE. */
2786
2787 BOOL
2788 smtp_transport_entry(
2789 transport_instance *tblock, /* data for this instantiation */
2790 address_item *addrlist) /* addresses we are working on */
2791 {
2792 int cutoff_retry;
2793 int port;
2794 int hosts_defer = 0;
2795 int hosts_fail = 0;
2796 int hosts_looked_up = 0;
2797 int hosts_retry = 0;
2798 int hosts_serial = 0;
2799 int hosts_total = 0;
2800 int total_hosts_tried = 0;
2801 address_item *addr;
2802 BOOL expired = TRUE;
2803 BOOL continuing = continue_hostname != NULL;
2804 uschar *expanded_hosts = NULL;
2805 uschar *pistring;
2806 uschar *tid = string_sprintf("%s transport", tblock->name);
2807 smtp_transport_options_block *ob =
2808 (smtp_transport_options_block *)(tblock->options_block);
2809 host_item *hostlist = addrlist->host_list;
2810 host_item *host = NULL;
2811
2812 DEBUG(D_transport)
2813 {
2814 debug_printf("%s transport entered\n", tblock->name);
2815 for (addr = addrlist; addr != NULL; addr = addr->next)
2816 debug_printf(" %s\n", addr->address);
2817 if (continuing) debug_printf("already connected to %s [%s]\n",
2818 continue_hostname, continue_host_address);
2819 }
2820
2821 /* Set the flag requesting that these hosts be added to the waiting
2822 database if the delivery fails temporarily or if we are running with
2823 queue_smtp or a 2-stage queue run. This gets unset for certain
2824 kinds of error, typically those that are specific to the message. */
2825
2826 update_waiting = TRUE;
2827
2828 /* If a host list is not defined for the addresses - they must all have the
2829 same one in order to be passed to a single transport - or if the transport has
2830 a host list with hosts_override set, use the host list supplied with the
2831 transport. It is an error for this not to exist. */
2832
2833 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2834 {
2835 if (ob->hosts == NULL)
2836 {
2837 addrlist->message = string_sprintf("%s transport called with no hosts set",
2838 tblock->name);
2839 addrlist->transport_return = PANIC;
2840 return FALSE; /* Only top address has status */
2841 }
2842
2843 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2844 ob->hosts);
2845
2846 /* If the transport's host list contains no '$' characters, and we are not
2847 randomizing, it is fixed and therefore a chain of hosts can be built once
2848 and for all, and remembered for subsequent use by other calls to this
2849 transport. If, on the other hand, the host list does contain '$', or we are
2850 randomizing its order, we have to rebuild it each time. In the fixed case,
2851 as the hosts string will never be used again, it doesn't matter that we
2852 replace all the : characters with zeros. */
2853
2854 if (ob->hostlist == NULL)
2855 {
2856 uschar *s = ob->hosts;
2857
2858 if (Ustrchr(s, '$') != NULL)
2859 {
2860 expanded_hosts = expand_string(s);
2861 if (expanded_hosts == NULL)
2862 {
2863 addrlist->message = string_sprintf("failed to expand list of hosts "
2864 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2865 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2866 return FALSE; /* Only top address has status */
2867 }
2868 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2869 "\"%s\"\n", s, expanded_hosts);
2870 s = expanded_hosts;
2871 }
2872 else
2873 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2874
2875 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2876
2877 /* Check that the expansion yielded something useful. */
2878 if (hostlist == NULL)
2879 {
2880 addrlist->message =
2881 string_sprintf("%s transport has empty hosts setting", tblock->name);
2882 addrlist->transport_return = PANIC;
2883 return FALSE; /* Only top address has status */
2884 }
2885
2886 /* If there was no expansion of hosts, save the host list for
2887 next time. */
2888
2889 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2890 }
2891
2892 /* This is not the first time this transport has been run in this delivery;
2893 the host list was built previously. */
2894
2895 else hostlist = ob->hostlist;
2896 }
2897
2898 /* The host list was supplied with the address. If hosts_randomize is set, we
2899 must sort it into a random order if it did not come from MX records and has not
2900 already been randomized (but don't bother if continuing down an existing
2901 connection). */
2902
2903 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2904 {
2905 host_item *newlist = NULL;
2906 while (hostlist != NULL)
2907 {
2908 host_item *h = hostlist;
2909 hostlist = hostlist->next;
2910
2911 h->sort_key = random_number(100);
2912
2913 if (newlist == NULL)
2914 {
2915 h->next = NULL;
2916 newlist = h;
2917 }
2918 else if (h->sort_key < newlist->sort_key)
2919 {
2920 h->next = newlist;
2921 newlist = h;
2922 }
2923 else
2924 {
2925 host_item *hh = newlist;
2926 while (hh->next != NULL)
2927 {
2928 if (h->sort_key < hh->next->sort_key) break;
2929 hh = hh->next;
2930 }
2931 h->next = hh->next;
2932 hh->next = h;
2933 }
2934 }
2935
2936 hostlist = addrlist->host_list = newlist;
2937 }
2938
2939
2940 /* Sort out the default port. */
2941
2942 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2943
2944
2945 /* For each host-plus-IP-address on the list:
2946
2947 . If this is a continued delivery and the host isn't the one with the
2948 current connection, skip.
2949
2950 . If the status is unusable (i.e. previously failed or retry checked), skip.
2951
2952 . If no IP address set, get the address, either by turning the name into
2953 an address, calling gethostbyname if gethostbyname is on, or by calling
2954 the DNS. The DNS may yield multiple addresses, in which case insert the
2955 extra ones into the list.
2956
2957 . Get the retry data if not previously obtained for this address and set the
2958 field which remembers the state of this address. Skip if the retry time is
2959 not reached. If not, remember whether retry data was found. The retry string
2960 contains both the name and the IP address.
2961
2962 . Scan the list of addresses and mark those whose status is DEFER as
2963 PENDING_DEFER. These are the only ones that will be processed in this cycle
2964 of the hosts loop.
2965
2966 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2967 Some addresses may be successfully delivered, others may fail, and yet
2968 others may get temporary errors and so get marked DEFER.
2969
2970 . The return from the delivery attempt is OK if a connection was made and a
2971 valid SMTP dialogue was completed. Otherwise it is DEFER.
2972
2973 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2974
2975 . If fail to connect, or other defer state, add a retry item.
2976
2977 . If there are any addresses whose status is still DEFER, carry on to the
2978 next host/IPaddress, unless we have tried the number of hosts given
2979 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2980 there is some fancy logic for hosts_max_try that means its limit can be
2981 overstepped in some circumstances.
2982
2983 If we get to the end of the list, all hosts have deferred at least one address,
2984 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2985 delivery attempt to those hosts whose last try was before the arrival time of
2986 the current message. To cope with this, we have to go round the loop a second
2987 time. After that, set the status and error data for any addresses that haven't
2988 had it set already. */
2989
2990 for (cutoff_retry = 0; expired &&
2991 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2992 cutoff_retry++)
2993 {
2994 host_item *nexthost = NULL;
2995 int unexpired_hosts_tried = 0;
2996
2997 for (host = hostlist;
2998 host != NULL &&
2999 unexpired_hosts_tried < ob->hosts_max_try &&
3000 total_hosts_tried < ob->hosts_max_try_hardlimit;
3001 host = nexthost)
3002 {
3003 int rc;
3004 int host_af;
3005 uschar *rs;
3006 BOOL serialized = FALSE;
3007 BOOL host_is_expired = FALSE;
3008 BOOL message_defer = FALSE;
3009 BOOL ifchanges = FALSE;
3010 BOOL some_deferred = FALSE;
3011 address_item *first_addr = NULL;
3012 uschar *interface = NULL;
3013 uschar *retry_host_key = NULL;
3014 uschar *retry_message_key = NULL;
3015 uschar *serialize_key = NULL;
3016
3017 /* Default next host is next host. :-) But this can vary if the
3018 hosts_max_try limit is hit (see below). It may also be reset if a host
3019 address is looked up here (in case the host was multihomed). */
3020
3021 nexthost = host->next;
3022
3023 /* If the address hasn't yet been obtained from the host name, look it up
3024 now, unless the host is already marked as unusable. If it is marked as
3025 unusable, it means that the router was unable to find its IP address (in
3026 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3027 the lookup failed last time. We don't get this far if *all* MX records
3028 point to non-existent hosts; that is treated as a hard error.
3029
3030 We can just skip this host entirely. When the hosts came from the router,
3031 the address will timeout based on the other host(s); when the address is
3032 looked up below, there is an explicit retry record added.
3033
3034 Note that we mustn't skip unusable hosts if the address is not unset; they
3035 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3036
3037 if (host->address == NULL)
3038 {
3039 int new_port, flags;
3040 host_item *hh;
3041 uschar *canonical_name;
3042
3043 if (host->status >= hstatus_unusable)
3044 {
3045 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3046 host->name);
3047 continue;
3048 }
3049
3050 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3051
3052 /* The host name is permitted to have an attached port. Find it, and
3053 strip it from the name. Just remember it for now. */
3054
3055 new_port = host_item_get_port(host);
3056
3057 /* Count hosts looked up */
3058
3059 hosts_looked_up++;
3060
3061 /* Find by name if so configured, or if it's an IP address. We don't
3062 just copy the IP address, because we need the test-for-local to happen. */
3063
3064 flags = HOST_FIND_BY_A;
3065 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3066 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3067
3068 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3069 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
3070 else
3071 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3072 ob->dnssec_request_domains, ob->dnssec_require_domains,
3073 &canonical_name, NULL);
3074
3075 /* Update the host (and any additional blocks, resulting from
3076 multihoming) with a host-specific port, if any. */
3077
3078 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3079
3080 /* Failure to find the host at this time (usually DNS temporary failure)
3081 is really a kind of routing failure rather than a transport failure.
3082 Therefore we add a retry item of the routing kind, not to stop us trying
3083 to look this name up here again, but to ensure the address gets timed
3084 out if the failures go on long enough. A complete failure at this point
3085 commonly points to a configuration error, but the best action is still
3086 to carry on for the next host. */
3087
3088 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3089 {
3090 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3091 expired = FALSE;
3092 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3093 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3094 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3095 host->status = hstatus_unusable;
3096
3097 for (addr = addrlist; addr != NULL; addr = addr->next)
3098 {
3099 if (addr->transport_return != DEFER) continue;
3100 addr->basic_errno = ERRNO_UNKNOWNHOST;
3101 addr->message =
3102 string_sprintf("failed to lookup IP address for %s", host->name);
3103 }
3104 continue;
3105 }
3106
3107 /* If the host is actually the local host, we may have a problem, or
3108 there may be some cunning configuration going on. In the problem case,
3109 log things and give up. The default transport status is already DEFER. */
3110
3111 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3112 {
3113 for (addr = addrlist; addr != NULL; addr = addr->next)
3114 {
3115 addr->basic_errno = 0;
3116 addr->message = string_sprintf("%s transport found host %s to be "
3117 "local", tblock->name, host->name);
3118 }
3119 goto END_TRANSPORT;
3120 }
3121 } /* End of block for IP address lookup */
3122
3123 /* If this is a continued delivery, we are interested only in the host
3124 which matches the name of the existing open channel. The check is put
3125 here after the local host lookup, in case the name gets expanded as a
3126 result of the lookup. Set expired FALSE, to save the outer loop executing
3127 twice. */
3128
3129 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3130 Ustrcmp(continue_host_address, host->address) != 0))
3131 {
3132 expired = FALSE;
3133 continue; /* With next host */
3134 }
3135
3136 /* Reset the default next host in case a multihomed host whose addresses
3137 are not looked up till just above added to the host list. */
3138
3139 nexthost = host->next;
3140
3141 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3142 domain is in queue_smtp_domains, we don't actually want to attempt any
3143 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3144 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3145 were not in it. We don't want to hold up all SMTP deliveries! Except when
3146 doing a two-stage queue run, don't do this if forcing. */
3147
3148 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3149 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3150 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3151 {
3152 expired = FALSE;
3153 for (addr = addrlist; addr != NULL; addr = addr->next)
3154 {
3155 if (addr->transport_return != DEFER) continue;
3156 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3157 }
3158 continue; /* With next host */
3159 }
3160
3161 /* Count hosts being considered - purely for an intelligent comment
3162 if none are usable. */
3163
3164 hosts_total++;
3165
3166 /* Set $host and $host address now in case they are needed for the
3167 interface expansion or the serialize_hosts check; they remain set if an
3168 actual delivery happens. */
3169
3170 deliver_host = host->name;
3171 deliver_host_address = host->address;
3172 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3173 : host->dnssec == DS_NO ? US"no"
3174 : US"";
3175
3176 /* Set up a string for adding to the retry key if the port number is not
3177 the standard SMTP port. A host may have its own port setting that overrides
3178 the default. */
3179
3180 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3181 port : host->port);
3182 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3183
3184 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3185 string changes upon expansion, we must add it to the key that is used for
3186 retries, because connections to the same host from a different interface
3187 should be treated separately. */
3188
3189 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3190 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3191 &interface, tid))
3192 return FALSE;
3193 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3194
3195 /* The first time round the outer loop, check the status of the host by
3196 inspecting the retry data. The second time round, we are interested only
3197 in expired hosts that haven't been tried since this message arrived. */
3198
3199 if (cutoff_retry == 0)
3200 {
3201 BOOL incl_ip;
3202 /* Ensure the status of the address is set by checking retry data if
3203 necessary. There may be host-specific retry data (applicable to all
3204 messages) and also data for retries of a specific message at this host.
3205 If either of these retry records are actually read, the keys used are
3206 returned to save recomputing them later. */
3207
3208 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3209 US"retry_include_ip_address", ob->retry_include_ip_address,
3210 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3211 continue; /* with next host */
3212
3213 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3214 incl_ip, &retry_host_key, &retry_message_key);
3215
3216 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3217 (host->address == NULL)? US"" : host->address, pistring,
3218 (host->status == hstatus_usable)? "usable" :
3219 (host->status == hstatus_unusable)? "unusable" :
3220 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3221
3222 /* Skip this address if not usable at this time, noting if it wasn't
3223 actually expired, both locally and in the address. */
3224
3225 switch (host->status)
3226 {
3227 case hstatus_unusable:
3228 expired = FALSE;
3229 setflag(addrlist, af_retry_skipped);
3230 /* Fall through */
3231
3232 case hstatus_unusable_expired:
3233 switch (host->why)
3234 {
3235 case hwhy_retry: hosts_retry++; break;
3236 case hwhy_failed: hosts_fail++; break;
3237 case hwhy_deferred: hosts_defer++; break;
3238 }
3239
3240 /* If there was a retry message key, implying that previously there
3241 was a message-specific defer, we don't want to update the list of
3242 messages waiting for these hosts. */
3243
3244 if (retry_message_key != NULL) update_waiting = FALSE;
3245 continue; /* With the next host or IP address */
3246 }
3247 }
3248
3249 /* Second time round the loop: if the address is set but expired, and
3250 the message is newer than the last try, let it through. */
3251
3252 else
3253 {
3254 if (host->address == NULL ||
3255 host->status != hstatus_unusable_expired ||
3256 host->last_try > received_time)
3257 continue;
3258 DEBUG(D_transport)
3259 debug_printf("trying expired host %s [%s]%s\n",
3260 host->name, host->address, pistring);
3261 host_is_expired = TRUE;
3262 }
3263
3264 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3265 it remains TRUE only if all hosts are expired and none are actually tried.
3266 */
3267
3268 expired = FALSE;
3269
3270 /* If this host is listed as one to which access must be serialized,
3271 see if another Exim process has a connection to it, and if so, skip
3272 this host. If not, update the database to record our connection to it
3273 and remember this for later deletion. Do not do any of this if we are
3274 sending the message down a pre-existing connection. */
3275
3276 if (!continuing &&
3277 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3278 host->address, NULL) == OK)
3279 {
3280 serialize_key = string_sprintf("host-serialize-%s", host->name);
3281 if (!enq_start(serialize_key))
3282 {
3283 DEBUG(D_transport)
3284 debug_printf("skipping host %s because another Exim process "
3285 "is connected to it\n", host->name);
3286 hosts_serial++;
3287 continue;
3288 }
3289 serialized = TRUE;
3290 }
3291
3292 /* OK, we have an IP address that is not waiting for its retry time to
3293 arrive (it might be expired) OR (second time round the loop) we have an
3294 expired host that hasn't been tried since the message arrived. Have a go
3295 at delivering the message to it. First prepare the addresses by flushing
3296 out the result of previous attempts, and finding the first address that
3297 is still to be delivered. */
3298
3299 first_addr = prepare_addresses(addrlist, host);
3300
3301 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3302 message_id, host->name, host->address, addrlist->address,
3303 (addrlist->next == NULL)? "" : ", ...");
3304
3305 set_process_info("delivering %s to %s [%s] (%s%s)",
3306 message_id, host->name, host->address, addrlist->address,
3307 (addrlist->next == NULL)? "" : ", ...");
3308
3309 /* This is not for real; don't do the delivery. If there are
3310 any remaining hosts, list them. */
3311
3312 if (dont_deliver)
3313 {
3314 host_item *host2;
3315 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3316 for (addr = addrlist; addr != NULL; addr = addr->next)
3317 {
3318 addr->host_used = host;
3319 addr->special_action = '*';
3320 addr->message = US"delivery bypassed by -N option";
3321 }
3322 DEBUG(D_transport)
3323 {
3324 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3325 "*** host and remaining hosts:\n", tblock->name);
3326 for (host2 = host; host2 != NULL; host2 = host2->next)
3327 debug_printf(" %s [%s]\n", host2->name,
3328 (host2->address == NULL)? US"unset" : host2->address);
3329 }
3330 rc = OK;
3331 }
3332
3333 /* This is for real. If the host is expired, we don't count it for
3334 hosts_max_retry. This ensures that all hosts must expire before an address
3335 is timed out, unless hosts_max_try_hardlimit (which protects against
3336 lunatic DNS configurations) is reached.
3337
3338 If the host is not expired and we are about to hit the hosts_max_retry
3339 limit, check to see if there is a subsequent hosts with a different MX
3340 value. If so, make that the next host, and don't count this one. This is a
3341 heuristic to make sure that different MXs do get tried. With a normal kind
3342 of retry rule, they would get tried anyway when the earlier hosts were
3343 delayed, but if the domain has a "retry every time" type of rule - as is
3344 often used for the the very large ISPs, that won't happen. */
3345
3346 else
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, host, host_af, port, interface, tblock,
3368 expanded_hosts != NULL, &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, host, host_af, port, interface, tblock,
3415 expanded_hosts != NULL, &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.