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