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use smtp_context struct for sync_responses()
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 #endif
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
95 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
98 #endif
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
101 #ifdef SUPPORT_TLS
102 # ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
105 # endif
106 # ifndef DISABLE_OCSP
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
109 # endif
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
112 #endif
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
117 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
120 #endif
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
123 #ifndef DISABLE_PRDR
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 #endif
127 #ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130 #endif
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
151 #ifdef SUPPORT_SOCKS
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154 #endif
155 #ifdef SUPPORT_TLS
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
178 #endif
179 };
180
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
183
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187 /* Default private options block for the smtp transport. */
188
189 smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
199 NULL, /* DSCP */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 US"*", /* hosts_try_chunking */
204 #ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
206 NULL, /* hosts_require_dane */
207 #endif
208 NULL, /* hosts_try_fastopen */
209 #ifndef DISABLE_PRDR
210 US"*", /* hosts_try_prdr */
211 #endif
212 #ifndef DISABLE_OCSP
213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
214 NULL, /* hosts_require_ocsp */
215 #endif
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
218 NULL, /* hosts_verify_avoid_tls */
219 NULL, /* hosts_avoid_pipelining */
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
228 50, /* hosts_max_try_hardlimit */
229 TRUE, /* address_retry_include_sender */
230 FALSE, /* allow_localhost */
231 FALSE, /* authenticated_sender_force */
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
235 { NULL, NULL }, /* dnssec_domains {request,require} */
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
240 FALSE, /* lmtp_ignore_quota */
241 NULL, /* expand_retry_include_ip_address */
242 TRUE /* retry_include_ip_address */
243 #ifdef SUPPORT_SOCKS
244 ,NULL /* socks_proxy */
245 #endif
246 #ifdef SUPPORT_TLS
247 ,NULL, /* tls_certificate */
248 NULL, /* tls_crl */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
251 NULL, /* tls_sni */
252 US"system", /* tls_verify_certificates */
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
257 US"*", /* tls_try_verify_hosts */
258 US"*" /* tls_verify_cert_hostnames */
259 #endif
260 #ifndef DISABLE_DKIM
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
268 #endif
269 };
270
271 /* some DSN flags for use later */
272
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
275
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
277
278
279
280 /* Local statics */
281
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285 static BOOL update_waiting; /* TRUE to update the "wait" database */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
287
288
289 /*************************************************
290 * Setup entry point *
291 *************************************************/
292
293 /* This function is called when the transport is about to be used,
294 but before running it in a sub-process. It is used for two things:
295
296 (1) To set the fallback host list in addresses, when delivering.
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
299
300 Arguments:
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
306 errmsg place for error message (not used)
307
308 Returns: OK always (FAIL, DEFER not used)
309 */
310
311 static int
312 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
314 {
315 smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
317
318 errmsg = errmsg; /* Keep picky compilers happy */
319 uid = uid;
320 gid = gid;
321
322 /* Pass back options if required. This interface is getting very messy. */
323
324 if (tf)
325 {
326 tf->interface = ob->interface;
327 tf->port = ob->port;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
335 tf->helo_data = ob->helo_data;
336 }
337
338 /* Set the fallback host list for all the addresses that don't have fallback
339 host lists, provided that the local host wasn't present in the original host
340 list. */
341
342 if (!testflag(addrlist, af_local_host_removed))
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
345
346 return OK;
347 }
348
349
350
351 /*************************************************
352 * Initialization entry point *
353 *************************************************/
354
355 /* Called for each instance, after its options have been read, to
356 enable consistency checks to be done, or anything else that needs
357 to be set up.
358
359 Argument: pointer to the transport instance block
360 Returns: nothing
361 */
362
363 void
364 smtp_transport_init(transport_instance *tblock)
365 {
366 smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
368
369 /* Retry_use_local_part defaults FALSE if unset */
370
371 if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
373
374 /* Set the default port according to the protocol */
375
376 if (ob->port == NULL)
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
379
380 /* Set up the setup entry point, to be called before subprocesses for this
381 transport. */
382
383 tblock->setup = smtp_transport_setup;
384
385 /* Complain if any of the timeouts are zero. */
386
387 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
391 tblock->name);
392
393 /* If hosts_override is set and there are local hosts, set the global
394 flag that stops verify from showing router hosts. */
395
396 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
397
398 /* If there are any fallback hosts listed, build a chain of host items
399 for them, but do not do any lookups at this time. */
400
401 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
402 }
403
404
405
406
407
408 /*************************************************
409 * Set delivery info into all active addresses *
410 *************************************************/
411
412 /* Only addresses whose status is >= PENDING are relevant. A lesser
413 status means that an address is not currently being processed.
414
415 Arguments:
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
421 host if set, mark addrs as having used this host
422 smtp_greeting from peer
423 helo_response from peer
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, host_item * host
435 #ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
437 #endif
438 )
439 {
440 address_item *addr;
441 int orvalue = 0;
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
443 {
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
446 }
447 for (addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
449 {
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
452 if (msg)
453 {
454 addr->message = msg;
455 if (pass_message) setflag(addr, af_pass_message);
456 }
457 addr->transport_return = rc;
458 if (host)
459 {
460 addr->host_used = host;
461 #ifdef EXPERIMENTAL_DSN_INFO
462 if (smtp_greeting)
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
465
466 if (helo_response)
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
469 #endif
470 }
471 }
472 }
473
474 static void
475 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
476 BOOL pass_message)
477 {
478 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , NULL, NULL
481 #endif
482 );
483 }
484
485
486 /*************************************************
487 * Check an SMTP response *
488 *************************************************/
489
490 /* This function is given an errno code and the SMTP response buffer
491 to analyse, together with the host identification for generating messages. It
492 sets an appropriate message and puts the first digit of the response code into
493 the yield variable. If no response was actually read, a suitable digit is
494 chosen.
495
496 Arguments:
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
502 message where to put an error message
503 pass_message set TRUE if message is an SMTP response
504
505 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
506 */
507
508 static BOOL
509 check_response(host_item *host, int *errno_value, int more_errno,
510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
511 {
512 uschar * pl = pipelining_active ? US"pipelined " : US"";
513
514 *yield = '4'; /* Default setting is to give a temporary error */
515
516 /* Handle response timeout */
517
518 if (*errno_value == ETIMEDOUT)
519 {
520 *message = US string_sprintf("SMTP timeout after %s%s",
521 pl, smtp_command);
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
524 transport_count);
525 return FALSE;
526 }
527
528 /* Handle malformed SMTP response */
529
530 if (*errno_value == ERRNO_SMTPFORMAT)
531 {
532 const uschar *malfresp = string_printing(buffer);
533 while (isspace(*malfresp)) malfresp++;
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
539 return FALSE;
540 }
541
542 /* Handle a failed filter process error; can't send QUIT as we mustn't
543 end the DATA. */
544
545 if (*errno_value == ERRNO_FILTER_FAIL)
546 {
547 *message = US string_sprintf("transport filter process failed (%d)%s",
548 more_errno,
549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
550 return FALSE;
551 }
552
553 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
554 end the DATA. */
555
556 if (*errno_value == ERRNO_CHHEADER_FAIL)
557 {
558 *message =
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
561 return FALSE;
562 }
563
564 /* Handle failure to write a complete data block */
565
566 if (*errno_value == ERRNO_WRITEINCOMPLETE)
567 {
568 *message = US string_sprintf("failed to write a data block");
569 return FALSE;
570 }
571
572 #ifdef SUPPORT_I18N
573 /* Handle lack of advertised SMTPUTF8, for international message */
574 if (*errno_value == ERRNO_UTF8_FWD)
575 {
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
579 }
580 #endif
581
582 /* Handle error responses from the remote mailer. */
583
584 if (buffer[0] != 0)
585 {
586 const uschar *s = string_printing(buffer);
587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
588 "%s", pl, smtp_command, s);
589 *pass_message = TRUE;
590 *yield = buffer[0];
591 return TRUE;
592 }
593
594 /* No data was read. If there is no errno, this must be the EOF (i.e.
595 connection closed) case, which causes deferral. An explicit connection reset
596 error has the same effect. Otherwise, put the host's identity in the message,
597 leaving the errno value to be interpreted as well. In all cases, we have to
598 assume the connection is now dead. */
599
600 if (*errno_value == 0 || *errno_value == ECONNRESET)
601 {
602 *errno_value = ERRNO_SMTPCLOSED;
603 *message = US string_sprintf("Remote host closed connection "
604 "in response to %s%s", pl, smtp_command);
605 }
606 else *message = US string_sprintf("%s [%s]", host->name, host->address);
607
608 return FALSE;
609 }
610
611
612
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
616
617 /* This writes to the main log and to the message log.
618
619 Arguments:
620 addr the address item containing error information
621 host the current host
622
623 Returns: nothing
624 */
625
626 static void
627 write_logs(address_item *addr, host_item *host)
628 {
629 uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
633
634 if (addr->message)
635 {
636 message = string_sprintf("%s: %s", message, addr->message);
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
641 }
642 else
643 {
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
647 }
648 }
649
650 static void
651 msglog_line(host_item * host, uschar * message)
652 {
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
655 }
656
657
658
659 #ifndef DISABLE_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
663
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667 Arguments:
668 addr the address item containing error information
669 host the current host
670
671 Returns: nothing
672 */
673
674 static void
675 deferred_event_raise(address_item *addr, host_item *host)
676 {
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
679 uschar * save_local;
680
681 if (!action)
682 return;
683
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
686
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
691
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
696
697 (void) event_raise(action, US"msg:host:defer",
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
709 }
710 #endif
711
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
715
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
721 of code.
722
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
727
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
736
737 Arguments:
738 sx smtp connection context
739 count the number of responses to read
740 pending_DATA 0 if last command sent was not DATA
741 +1 if previously had a good recipient
742 -1 if not previously had a good recipient
743
744 Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
751 */
752
753 static int
754 sync_responses(smtp_context * sx, int count, int pending_DATA)
755 {
756 address_item *addr = sx->sync_addr;
757 int yield = 0;
758
759 /* Handle the response for a MAIL command. On error, reinstate the original
760 command in big_buffer for error message use, and flush any further pending
761 responses before returning, except after I/O errors and timeouts. */
762
763 if (sx->pending_MAIL)
764 {
765 count--;
766 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2', ((smtp_transport_options_block *)sx->tblock->options_block)->command_timeout))
767 {
768 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
769 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
770 if (errno == 0 && sx->buffer[0] != 0)
771 {
772 uschar flushbuffer[4096];
773 int save_errno = 0;
774 if (sx->buffer[0] == '4')
775 {
776 save_errno = ERRNO_MAIL4XX;
777 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
778 }
779 while (count-- > 0)
780 {
781 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
782 '2', ((smtp_transport_options_block *)sx->tblock->options_block)->command_timeout)
783 && (errno != 0 || flushbuffer[0] == 0))
784 break;
785 }
786 errno = save_errno;
787 }
788
789 if (pending_DATA) count--; /* Number of RCPT responses to come */
790 while (count-- > 0) /* Mark any pending addrs with the host used */
791 {
792 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
793 addr->host_used = sx->host;
794 addr = addr->next;
795 }
796 return -3;
797 }
798 }
799
800 if (pending_DATA) count--; /* Number of RCPT responses to come */
801
802 /* Read and handle the required number of RCPT responses, matching each one up
803 with an address by scanning for the next address whose status is PENDING_DEFER.
804 */
805
806 while (count-- > 0)
807 {
808 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
809
810 /* The address was accepted */
811 addr->host_used = sx->host;
812
813 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2', ((smtp_transport_options_block *)sx->tblock->options_block)->command_timeout))
814 {
815 yield |= 1;
816 addr->transport_return = PENDING_OK;
817
818 /* If af_dr_retry_exists is set, there was a routing delay on this address;
819 ensure that any address-specific retry record is expunged. We do this both
820 for the basic key and for the version that also includes the sender. */
821
822 if (testflag(addr, af_dr_retry_exists))
823 {
824 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
825 sender_address);
826 retry_add_item(addr, altkey, rf_delete);
827 retry_add_item(addr, addr->address_retry_key, rf_delete);
828 }
829 }
830
831 /* Timeout while reading the response */
832
833 else if (errno == ETIMEDOUT)
834 {
835 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
836 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
837 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
838 retry_add_item(addr, addr->address_retry_key, 0);
839 update_waiting = FALSE;
840 return -1;
841 }
842
843 /* Handle other errors in obtaining an SMTP response by returning -1. This
844 will cause all the addresses to be deferred. Restore the SMTP command in
845 big_buffer for which we are checking the response, so the error message
846 makes sense. */
847
848 else if (errno != 0 || sx->buffer[0] == 0)
849 {
850 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
851 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
852 return -2;
853 }
854
855 /* Handle SMTP permanent and temporary response codes. */
856
857 else
858 {
859 addr->message =
860 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
861 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
862 string_printing(sx->buffer));
863 setflag(addr, af_pass_message);
864 msglog_line(sx->host, addr->message);
865
866 /* The response was 5xx */
867
868 if (sx->buffer[0] == '5')
869 {
870 addr->transport_return = FAIL;
871 yield |= 2;
872 }
873
874 /* The response was 4xx */
875
876 else
877 {
878 addr->transport_return = DEFER;
879 addr->basic_errno = ERRNO_RCPT4XX;
880 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
881
882 #ifndef DISABLE_EVENT
883 event_defer_errno = addr->more_errno;
884 msg_event_raise(US"msg:rcpt:host:defer", addr);
885 #endif
886
887 /* Log temporary errors if there are more hosts to be tried.
888 If not, log this last one in the == line. */
889
890 if (sx->host->next)
891 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->host->name, sx->host->address, addr->message);
892
893 #ifndef DISABLE_EVENT
894 else
895 msg_event_raise(US"msg:rcpt:defer", addr);
896 #endif
897
898 /* Do not put this message on the list of those waiting for specific
899 hosts, as otherwise it is likely to be tried too often. */
900
901 update_waiting = FALSE;
902
903 /* Add a retry item for the address so that it doesn't get tried again
904 too soon. If address_retry_include_sender is true, add the sender address
905 to the retry key. */
906
907 if (((smtp_transport_options_block *)sx->tblock->options_block)->address_retry_include_sender)
908 {
909 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
910 sender_address);
911 retry_add_item(addr, altkey, 0);
912 }
913 else retry_add_item(addr, addr->address_retry_key, 0);
914 }
915 }
916 } /* Loop for next RCPT response */
917
918 /* Update where to start at for the next block of responses, unless we
919 have already handled all the addresses. */
920
921 if (addr != NULL) sx->sync_addr = addr->next;
922
923 /* Handle a response to DATA. If we have not had any good recipients, either
924 previously or in this block, the response is ignored. */
925
926 if (pending_DATA != 0 &&
927 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '3', ((smtp_transport_options_block *)sx->tblock->options_block)->command_timeout))
928 {
929 int code;
930 uschar *msg;
931 BOOL pass_message;
932 if (pending_DATA > 0 || (yield & 1) != 0)
933 {
934 if (errno == 0 && sx->buffer[0] == '4')
935 {
936 errno = ERRNO_DATA4XX;
937 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
938 }
939 return -3;
940 }
941 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
942 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
943 "is in use and there were no good recipients\n", msg);
944 }
945
946 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
947 present) received 3xx. If any RCPTs were handled and yielded anything other
948 than 4xx, yield will be set non-zero. */
949
950 return yield;
951 }
952
953
954
955 /* Do the client side of smtp-level authentication */
956 /*
957 Arguments:
958 buffer EHLO response from server (gets overwritten)
959 addrlist chain of potential addresses to deliver
960 host host to deliver to
961 ob transport options
962 ibp, obp comms channel control blocks
963
964 Returns:
965 OK Success, or failed (but not required): global "smtp_authenticated" set
966 DEFER Failed authentication (and was required)
967 ERROR Internal problem
968
969 FAIL_SEND Failed communications - transmit
970 FAIL - response
971 */
972
973 int
974 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
975 smtp_transport_options_block *ob, BOOL is_esmtp,
976 smtp_inblock *ibp, smtp_outblock *obp)
977 {
978 int require_auth;
979 uschar *fail_reason = US"server did not advertise AUTH support";
980
981 smtp_authenticated = FALSE;
982 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
983 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
984
985 if (is_esmtp && !regex_AUTH) regex_AUTH =
986 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
987 FALSE, TRUE);
988
989 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
990 {
991 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
992 expand_nmax = -1; /* reset */
993
994 /* Must not do this check until after we have saved the result of the
995 regex match above. */
996
997 if (require_auth == OK ||
998 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
999 {
1000 auth_instance *au;
1001 fail_reason = US"no common mechanisms were found";
1002
1003 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1004
1005 /* Scan the configured authenticators looking for one which is configured
1006 for use as a client, which is not suppressed by client_condition, and
1007 whose name matches an authentication mechanism supported by the server.
1008 If one is found, attempt to authenticate by calling its client function.
1009 */
1010
1011 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1012 {
1013 uschar *p = names;
1014 if (!au->client ||
1015 (au->client_condition != NULL &&
1016 !expand_check_condition(au->client_condition, au->name,
1017 US"client authenticator")))
1018 {
1019 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1020 au->name,
1021 (au->client)? "client_condition is false" :
1022 "not configured as a client");
1023 continue;
1024 }
1025
1026 /* Loop to scan supported server mechanisms */
1027
1028 while (*p != 0)
1029 {
1030 int rc;
1031 int len = Ustrlen(au->public_name);
1032 while (isspace(*p)) p++;
1033
1034 if (strncmpic(au->public_name, p, len) != 0 ||
1035 (p[len] != 0 && !isspace(p[len])))
1036 {
1037 while (*p != 0 && !isspace(*p)) p++;
1038 continue;
1039 }
1040
1041 /* Found data for a listed mechanism. Call its client entry. Set
1042 a flag in the outblock so that data is overwritten after sending so
1043 that reflections don't show it. */
1044
1045 fail_reason = US"authentication attempt(s) failed";
1046 obp->authenticating = TRUE;
1047 rc = (au->info->clientcode)(au, ibp, obp,
1048 ob->command_timeout, buffer, bufsize);
1049 obp->authenticating = FALSE;
1050 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1051 au->name, rc);
1052
1053 /* A temporary authentication failure must hold up delivery to
1054 this host. After a permanent authentication failure, we carry on
1055 to try other authentication methods. If all fail hard, try to
1056 deliver the message unauthenticated unless require_auth was set. */
1057
1058 switch(rc)
1059 {
1060 case OK:
1061 smtp_authenticated = TRUE; /* stops the outer loop */
1062 client_authenticator = au->name;
1063 if (au->set_client_id != NULL)
1064 client_authenticated_id = expand_string(au->set_client_id);
1065 break;
1066
1067 /* Failure after writing a command */
1068
1069 case FAIL_SEND:
1070 return FAIL_SEND;
1071
1072 /* Failure after reading a response */
1073
1074 case FAIL:
1075 if (errno != 0 || buffer[0] != '5') return FAIL;
1076 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1077 au->name, host->name, host->address, buffer);
1078 break;
1079
1080 /* Failure by some other means. In effect, the authenticator
1081 decided it wasn't prepared to handle this case. Typically this
1082 is the result of "fail" in an expansion string. Do we need to
1083 log anything here? Feb 2006: a message is now put in the buffer
1084 if logging is required. */
1085
1086 case CANCELLED:
1087 if (*buffer != 0)
1088 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1089 "authentication H=%s [%s] %s", au->name, host->name,
1090 host->address, buffer);
1091 break;
1092
1093 /* Internal problem, message in buffer. */
1094
1095 case ERROR:
1096 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1097 DEFER, FALSE);
1098 return ERROR;
1099 }
1100
1101 break; /* If not authenticated, try next authenticator */
1102 } /* Loop for scanning supported server mechanisms */
1103 } /* Loop for further authenticators */
1104 }
1105 }
1106
1107 /* If we haven't authenticated, but are required to, give up. */
1108
1109 if (require_auth == OK && !smtp_authenticated)
1110 {
1111 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1112 string_sprintf("authentication required but %s", fail_reason), DEFER,
1113 FALSE);
1114 return DEFER;
1115 }
1116
1117 return OK;
1118 }
1119
1120
1121 /* Construct AUTH appendix string for MAIL TO */
1122 /*
1123 Arguments
1124 buffer to build string
1125 addrlist chain of potential addresses to deliver
1126 ob transport options
1127
1128 Globals smtp_authenticated
1129 client_authenticated_sender
1130 Return True on error, otherwise buffer has (possibly empty) terminated string
1131 */
1132
1133 BOOL
1134 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1135 smtp_transport_options_block *ob)
1136 {
1137 uschar *local_authenticated_sender = authenticated_sender;
1138
1139 #ifdef notdef
1140 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1141 #endif
1142
1143 if (ob->authenticated_sender != NULL)
1144 {
1145 uschar *new = expand_string(ob->authenticated_sender);
1146 if (new == NULL)
1147 {
1148 if (!expand_string_forcedfail)
1149 {
1150 uschar *message = string_sprintf("failed to expand "
1151 "authenticated_sender: %s", expand_string_message);
1152 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1153 return TRUE;
1154 }
1155 }
1156 else if (new[0] != 0) local_authenticated_sender = new;
1157 }
1158
1159 /* Add the authenticated sender address if present */
1160
1161 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1162 local_authenticated_sender != NULL)
1163 {
1164 string_format(buffer, bufsize, " AUTH=%s",
1165 auth_xtextencode(local_authenticated_sender,
1166 Ustrlen(local_authenticated_sender)));
1167 client_authenticated_sender = string_copy(local_authenticated_sender);
1168 }
1169 else
1170 *buffer= 0;
1171
1172 return FALSE;
1173 }
1174
1175
1176
1177 #ifdef EXPERIMENTAL_DANE
1178 /* Lookup TLSA record for host/port.
1179 Return: OK success with dnssec; DANE mode
1180 DEFER Do not use this host now, may retry later
1181 FAIL_FORCED No TLSA record; DANE not usable
1182 FAIL Do not use this connection
1183 */
1184
1185 int
1186 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1187 {
1188 /* move this out to host.c given the similarity to dns_lookup() ? */
1189 uschar buffer[300];
1190 const uschar * fullname = buffer;
1191
1192 /* TLSA lookup string */
1193 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1194
1195 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1196 {
1197 case DNS_SUCCEED:
1198 if (!dns_is_secure(dnsa))
1199 {
1200 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1201 return DEFER;
1202 }
1203 return OK;
1204
1205 case DNS_AGAIN:
1206 return DEFER; /* just defer this TLS'd conn */
1207
1208 case DNS_NODATA: /* no TLSA RR for this lookup */
1209 case DNS_NOMATCH: /* no records at all for this lookup */
1210 return dane_required ? FAIL : FAIL_FORCED;
1211
1212 default:
1213 case DNS_FAIL:
1214 return dane_required ? FAIL : DEFER;
1215 }
1216 }
1217 #endif
1218
1219
1220
1221 typedef struct smtp_compare_s
1222 {
1223 uschar *current_sender_address;
1224 struct transport_instance *tblock;
1225 } smtp_compare_t;
1226
1227
1228 /* Create a unique string that identifies this message, it is based on
1229 sender_address, helo_data and tls_certificate if enabled.
1230 */
1231
1232 static uschar *
1233 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1234 {
1235 address_item * addr1;
1236 uschar * if1 = US"";
1237 uschar * helo1 = US"";
1238 #ifdef SUPPORT_TLS
1239 uschar * tlsc1 = US"";
1240 #endif
1241 uschar * save_sender_address = sender_address;
1242 uschar * local_identity = NULL;
1243 smtp_transport_options_block * ob =
1244 (smtp_transport_options_block *)tblock->options_block;
1245
1246 sender_address = sender;
1247
1248 addr1 = deliver_make_addr (sender, TRUE);
1249 deliver_set_expansions(addr1);
1250
1251 if (ob->interface)
1252 if1 = expand_string(ob->interface);
1253
1254 if (ob->helo_data)
1255 helo1 = expand_string(ob->helo_data);
1256
1257 #ifdef SUPPORT_TLS
1258 if (ob->tls_certificate)
1259 tlsc1 = expand_string(ob->tls_certificate);
1260 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1261 #else
1262 local_identity = string_sprintf ("%s^%s", if1, helo1);
1263 #endif
1264
1265 deliver_set_expansions(NULL);
1266 sender_address = save_sender_address;
1267
1268 return local_identity;
1269 }
1270
1271
1272
1273 /* This routine is a callback that is called from transport_check_waiting.
1274 This function will evaluate the incoming message versus the previous
1275 message. If the incoming message is using a different local identity then
1276 we will veto this new message. */
1277
1278 static BOOL
1279 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1280 {
1281 uschar * message_local_identity,
1282 * current_local_identity,
1283 * new_sender_address;
1284
1285 current_local_identity =
1286 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1287
1288 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1289 return 0;
1290
1291 message_local_identity =
1292 smtp_local_identity(new_sender_address, s_compare->tblock);
1293
1294 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1295 }
1296
1297
1298
1299 uschar
1300 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1301 {
1302 #ifdef SUPPORT_TLS
1303 if ( checks & PEER_OFFERED_TLS
1304 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1305 checks &= ~PEER_OFFERED_TLS;
1306 #endif
1307
1308 if ( checks & PEER_OFFERED_IGNQ
1309 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1310 PCRE_EOPT, NULL, 0) < 0)
1311 checks &= ~PEER_OFFERED_IGNQ;
1312
1313 if ( checks & PEER_OFFERED_CHUNKING
1314 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_CHUNKING;
1316
1317 #ifndef DISABLE_PRDR
1318 if ( checks & PEER_OFFERED_PRDR
1319 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_PRDR;
1321 #endif
1322
1323 #ifdef SUPPORT_I18N
1324 if ( checks & PEER_OFFERED_UTF8
1325 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_UTF8;
1327 #endif
1328
1329 if ( checks & PEER_OFFERED_DSN
1330 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_DSN;
1332
1333 if ( checks & PEER_OFFERED_PIPE
1334 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1335 PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_PIPE;
1337
1338 if ( checks & PEER_OFFERED_SIZE
1339 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_SIZE;
1341
1342 return checks;
1343 }
1344
1345
1346
1347 /* Callback for emitting a BDAT data chunk header.
1348
1349 If given a nonzero size, first flush any buffered SMTP commands
1350 then emit the command.
1351
1352 Reap previous SMTP command responses if requested.
1353 Reap one SMTP command response if requested.
1354
1355 Returns: OK or ERROR
1356 */
1357
1358 static int
1359 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1360 unsigned chunk_size, unsigned flags)
1361 {
1362 smtp_transport_options_block * ob =
1363 (smtp_transport_options_block *)(tctx->tblock->options_block);
1364 int cmd_count = 0;
1365 int prev_cmd_count;
1366 uschar * buffer = tctx->buffer;
1367 smtp_context sx;
1368
1369
1370 /* Write SMTP chunk header command */
1371
1372 if (chunk_size > 0)
1373 {
1374 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1375 chunk_size,
1376 flags & tc_chunk_last ? " LAST" : "")
1377 ) < 0) return ERROR;
1378 if (flags & tc_chunk_last)
1379 data_command = string_copy(big_buffer); /* Save for later error message */
1380 }
1381
1382 prev_cmd_count = cmd_count += tctx->cmd_count;
1383
1384 /* Reap responses for any previous, but not one we just emitted */
1385
1386 if (chunk_size > 0)
1387 prev_cmd_count--;
1388 if (tctx->pending_BDAT)
1389 prev_cmd_count--;
1390
1391 if (flags & tc_reap_prev && prev_cmd_count > 0)
1392 {
1393 sx.first_addr = tctx->first_addr;
1394 sx.tblock = tctx->tblock;
1395 sx.sync_addr = *tctx->sync_addr;
1396 sx.host = tctx->host;
1397 sx.pending_MAIL = tctx->pending_MAIL;
1398 sx.inblock = *tctx->inblock;
1399
1400 DEBUG(D_transport) debug_printf("look for %d responses"
1401 " for previous pipelined cmds\n", prev_cmd_count);
1402
1403 switch(sync_responses(&sx, prev_cmd_count, 0))
1404 {
1405 case 1: /* 2xx (only) => OK */
1406 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1407 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1408 case 0: break; /* No 2xx or 5xx, but no probs */
1409
1410 case -1: /* Timeout on RCPT */
1411 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1412 }
1413 *tctx->sync_addr = sx.sync_addr;
1414 cmd_count = 1;
1415 if (!tctx->pending_BDAT)
1416 pipelining_active = FALSE;
1417 }
1418
1419 /* Reap response for an outstanding BDAT */
1420
1421 if (tctx->pending_BDAT)
1422 {
1423 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1424
1425 if (!smtp_read_response(tctx->inblock, sx.buffer, sizeof(sx.buffer), '2',
1426 ob->command_timeout))
1427 {
1428 if (errno == 0 && sx.buffer[0] == '4')
1429 {
1430 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1431 tctx->first_addr->more_errno |=
1432 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
1433 }
1434 return ERROR;
1435 }
1436 cmd_count--;
1437 tctx->pending_BDAT = FALSE;
1438 pipelining_active = FALSE;
1439 }
1440 else if (chunk_size > 0)
1441 tctx->pending_BDAT = TRUE;
1442
1443
1444 tctx->cmd_count = cmd_count;
1445 return OK;
1446 }
1447
1448
1449
1450 /*************************************************
1451 * Make connection for given message *
1452 *************************************************/
1453
1454 /*
1455 Arguments:
1456 ctx connection context
1457 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1458 a second attempt after TLS initialization fails
1459 verify TRUE if connection is for a verify callout, FALSE for
1460 a delivery attempt
1461
1462 Returns: OK - the connection was made and the delivery attempted;
1463 fd is set in the conn context, tls_out set up.
1464 DEFER - the connection could not be made, or something failed
1465 while setting up the SMTP session, or there was a
1466 non-message-specific error, such as a timeout.
1467 ERROR - helo_data or add_headers or authenticated_sender is
1468 specified for this transport, and the string failed
1469 to expand
1470 */
1471 int
1472 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls, BOOL verify)
1473 {
1474 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1475 dns_answer tlsa_dnsa;
1476 #endif
1477 BOOL pass_message = FALSE;
1478
1479 uschar * message = NULL;
1480 int save_errno;
1481 int yield = OK;
1482 int rc;
1483
1484 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1485
1486 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1487 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1488 sx->ok = FALSE;
1489 sx->send_rset = TRUE;
1490 sx->send_quit = TRUE;
1491 sx->setting_up = TRUE;
1492 sx->esmtp = TRUE;
1493 sx->esmtp_sent = FALSE;
1494 #ifdef SUPPORT_I18N
1495 sx->utf8_needed = FALSE;
1496 #endif
1497 sx->dsn_all_lasthop = TRUE;
1498 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1499 sx->dane = FALSE;
1500 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1501 #endif
1502
1503 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1504 sx->peer_offered = 0;
1505 sx->igquotstr = US"";
1506 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1507 #ifdef EXPERIMENTAL_DSN_INFO
1508 sx->smtp_greeting = NULL;
1509 sx->helo_response = NULL;
1510 #endif
1511
1512 smtp_command = US"initial connection";
1513 sx->buffer[0] = '\0';
1514
1515 /* Set up the buffer for reading SMTP response packets. */
1516
1517 sx->inblock.buffer = sx->inbuffer;
1518 sx->inblock.buffersize = sizeof(sx->inbuffer);
1519 sx->inblock.ptr = sx->inbuffer;
1520 sx->inblock.ptrend = sx->inbuffer;
1521
1522 /* Set up the buffer for holding SMTP commands while pipelining */
1523
1524 sx->outblock.buffer = sx->outbuffer;
1525 sx->outblock.buffersize = sizeof(sx->outbuffer);
1526 sx->outblock.ptr = sx->outbuffer;
1527 sx->outblock.cmd_count = 0;
1528 sx->outblock.authenticating = FALSE;
1529
1530 /* Reset the parameters of a TLS session. */
1531
1532 tls_out.bits = 0;
1533 tls_out.cipher = NULL; /* the one we may use for this transport */
1534 tls_out.ourcert = NULL;
1535 tls_out.peercert = NULL;
1536 tls_out.peerdn = NULL;
1537 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1538 tls_out.sni = NULL;
1539 #endif
1540 tls_out.ocsp = OCSP_NOT_REQ;
1541
1542 /* Flip the legacy TLS-related variables over to the outbound set in case
1543 they're used in the context of the transport. Don't bother resetting
1544 afterward (when being used by a transport) as we're in a subprocess.
1545 For verify, unflipped once the callout is dealt with */
1546
1547 tls_modify_variables(&tls_out);
1548
1549 #ifndef SUPPORT_TLS
1550 if (sx->smtps)
1551 {
1552 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1553 DEFER, FALSE);
1554 return ERROR;
1555 }
1556 #endif
1557
1558 /* Make a connection to the host if this isn't a continued delivery, and handle
1559 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1560 specially so they can be identified for retries. */
1561
1562 if (continue_hostname == NULL)
1563 {
1564 if (verify)
1565 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1566
1567 /* This puts port into host->port */
1568 sx->inblock.sock = sx->outblock.sock =
1569 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1570 sx->ob->connect_timeout, sx->tblock);
1571
1572 if (sx->inblock.sock < 0)
1573 {
1574 uschar * msg = NULL;
1575 int save_errno = errno;
1576 if (verify)
1577 {
1578 msg = strerror(errno);
1579 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1580 }
1581 set_errno_nohost(sx->addrlist,
1582 save_errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : save_errno,
1583 verify ? string_sprintf("could not connect: %s", msg)
1584 : NULL,
1585 DEFER, FALSE);
1586 sx->send_quit = FALSE;
1587 return DEFER;
1588 }
1589
1590 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1591 {
1592 tls_out.dane_verified = FALSE;
1593 tls_out.tlsa_usage = 0;
1594
1595 if (sx->host->dnssec == DS_YES)
1596 {
1597 if( sx->dane_required
1598 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1599 )
1600 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1601 {
1602 case OK: sx->dane = TRUE; break;
1603 case FAIL_FORCED: break;
1604 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1605 string_sprintf("DANE error: tlsa lookup %s",
1606 rc == DEFER ? "DEFER" : "FAIL"),
1607 rc, FALSE);
1608 return rc;
1609 }
1610 }
1611 else if (sx->dane_required)
1612 {
1613 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1614 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1615 FAIL, FALSE);
1616 return FAIL;
1617 }
1618
1619 if (sx->dane)
1620 sx->ob->tls_tempfail_tryclear = FALSE;
1621 }
1622 #endif /*DANE*/
1623
1624 /* Expand the greeting message while waiting for the initial response. (Makes
1625 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1626 delayed till here so that $sending_interface and $sending_port are set. */
1627
1628 if (sx->helo_data)
1629 if (!(sx->helo_data = expand_string(sx->helo_data)))
1630 if (verify)
1631 log_write(0, LOG_MAIN|LOG_PANIC,
1632 "<%s>: failed to expand transport's helo_data value for callout: %s",
1633 sx->addrlist->address, expand_string_message);
1634
1635 #ifdef SUPPORT_I18N
1636 if (sx->helo_data)
1637 {
1638 expand_string_message = NULL;
1639 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1640 &expand_string_message)),
1641 expand_string_message)
1642 if (verify)
1643 log_write(0, LOG_MAIN|LOG_PANIC,
1644 "<%s>: failed to expand transport's helo_data value for callout: %s",
1645 sx->addrlist->address, expand_string_message);
1646 else
1647 sx->helo_data = NULL;
1648 }
1649 #endif
1650
1651 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1652 is nevertheless a reasonably clean way of programming this kind of logic,
1653 where you want to escape on any error. */
1654
1655 if (!sx->smtps)
1656 {
1657 BOOL good_response;
1658
1659 #ifdef TCP_QUICKACK
1660 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1661 #endif
1662 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1663 '2', sx->ob->command_timeout);
1664 #ifdef EXPERIMENTAL_DSN_INFO
1665 sx->smtp_greeting = string_copy(sx->buffer);
1666 #endif
1667 if (!good_response) goto RESPONSE_FAILED;
1668
1669 #ifndef DISABLE_EVENT
1670 {
1671 uschar * s;
1672 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1673 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1674 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1675 if (s)
1676 {
1677 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1678 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1679 DEFER, FALSE);
1680 yield = DEFER;
1681 goto SEND_QUIT;
1682 }
1683 }
1684 #endif
1685
1686 /* Now check if the helo_data expansion went well, and sign off cleanly if
1687 it didn't. */
1688
1689 if (!sx->helo_data)
1690 {
1691 message = string_sprintf("failed to expand helo_data: %s",
1692 expand_string_message);
1693 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1694 yield = DEFER;
1695 goto SEND_QUIT;
1696 }
1697 }
1698
1699 /** Debugging without sending a message
1700 sx->addrlist->transport_return = DEFER;
1701 goto SEND_QUIT;
1702 **/
1703
1704 /* Errors that occur after this point follow an SMTP command, which is
1705 left in big_buffer by smtp_write_command() for use in error messages. */
1706
1707 smtp_command = big_buffer;
1708
1709 /* Tell the remote who we are...
1710
1711 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1712 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1713 greeting is of this form. The assumption was that the far end supports it
1714 properly... but experience shows that there are some that give 5xx responses,
1715 even though the banner includes "ESMTP" (there's a bloody-minded one that
1716 says "ESMTP not spoken here"). Cope with that case.
1717
1718 September 2000: Time has passed, and it seems reasonable now to always send
1719 EHLO at the start. It is also convenient to make the change while installing
1720 the TLS stuff.
1721
1722 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1723 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1724 would be no way to send out the mails, so there is now a host list
1725 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1726 PIPELINING problem as well. Maybe it can also be useful to cure other
1727 problems with broken servers.
1728
1729 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1730 Then somebody tried it with a Microsoft mailer... It seems that all other
1731 mailers use upper case for some reason (the RFC is quite clear about case
1732 independence) so, for peace of mind, I gave in. */
1733
1734 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1735
1736 /* Alas; be careful, since this goto is not an error-out, so conceivably
1737 we might set data between here and the target which we assume to exist
1738 and be usable. I can see this coming back to bite us. */
1739 #ifdef SUPPORT_TLS
1740 if (sx->smtps)
1741 {
1742 smtp_peer_options |= PEER_OFFERED_TLS;
1743 suppress_tls = FALSE;
1744 sx->ob->tls_tempfail_tryclear = FALSE;
1745 smtp_command = US"SSL-on-connect";
1746 goto TLS_NEGOTIATE;
1747 }
1748 #endif
1749
1750 if (sx->esmtp)
1751 {
1752 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1753 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1754 goto SEND_FAILED;
1755 sx->esmtp_sent = TRUE;
1756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1757 sx->ob->command_timeout))
1758 {
1759 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1760 {
1761 #ifdef EXPERIMENTAL_DSN_INFO
1762 sx->helo_response = string_copy(sx->buffer);
1763 #endif
1764 goto RESPONSE_FAILED;
1765 }
1766 sx->esmtp = FALSE;
1767 }
1768 #ifdef EXPERIMENTAL_DSN_INFO
1769 sx->helo_response = string_copy(sx->buffer);
1770 #endif
1771 }
1772 else
1773 DEBUG(D_transport)
1774 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1775
1776 if (!sx->esmtp)
1777 {
1778 BOOL good_response;
1779 int n = sizeof(sx->buffer);
1780 uschar * rsp = sx->buffer;
1781
1782 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1783 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1784
1785 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1786 goto SEND_FAILED;
1787 good_response = smtp_read_response(&sx->inblock, rsp, n,
1788 '2', sx->ob->command_timeout);
1789 #ifdef EXPERIMENTAL_DSN_INFO
1790 sx->helo_response = string_copy(rsp);
1791 #endif
1792 if (!good_response)
1793 {
1794 /* Handle special logging for a closed connection after HELO
1795 when had previously sent EHLO */
1796
1797 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1798 {
1799 sx->send_quit = FALSE;
1800 save_errno = ERRNO_SMTPCLOSED;
1801 message = string_sprintf("Remote host closed connection "
1802 "in response to %s (EHLO response was: %s)",
1803 smtp_command, sx->buffer);
1804 goto FAILED;
1805 }
1806 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1807 goto RESPONSE_FAILED;
1808 }
1809 }
1810
1811 sx->peer_offered = smtp_peer_options = 0;
1812
1813 if (sx->esmtp || sx->lmtp)
1814 {
1815 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
1816 PEER_OFFERED_TLS /* others checked later */
1817 );
1818
1819 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1820
1821 #ifdef SUPPORT_TLS
1822 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1823 #endif
1824 }
1825 }
1826
1827 /* For continuing deliveries down the same channel, the socket is the standard
1828 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1829 below). Set up the pointer to where subsequent commands will be left, for
1830 error messages. Note that smtp_peer_options will have been
1831 set from the command line if they were set in the process that passed the
1832 connection on. */
1833
1834 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1835 as the continue goes via transport_pass_socket() and doublefork and exec.
1836 It does not wait. Unclear how we keep separate host's responses
1837 separate - we could match up by host ip+port as a bodge. */
1838
1839 else
1840 {
1841 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1842 smtp_command = big_buffer;
1843 sx->host->port = sx->port; /* Record the port that was used */
1844 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1845 }
1846
1847 /* If TLS is available on this connection, whether continued or not, attempt to
1848 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1849 send another EHLO - the server may give a different answer in secure mode. We
1850 use a separate buffer for reading the response to STARTTLS so that if it is
1851 negative, the original EHLO data is available for subsequent analysis, should
1852 the client not be required to use TLS. If the response is bad, copy the buffer
1853 for error analysis. */
1854
1855 #ifdef SUPPORT_TLS
1856 if ( smtp_peer_options & PEER_OFFERED_TLS
1857 && !suppress_tls
1858 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1859 && ( !verify
1860 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1861 ) )
1862 {
1863 uschar buffer2[4096];
1864 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1865 goto SEND_FAILED;
1866
1867 /* If there is an I/O error, transmission of this message is deferred. If
1868 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1869 false, we also defer. However, if there is a temporary rejection of STARTTLS
1870 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1871 STARTTLS, we carry on. This means we will try to send the message in clear,
1872 unless the host is in hosts_require_tls (tested below). */
1873
1874 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1875 sx->ob->command_timeout))
1876 {
1877 if ( errno != 0
1878 || buffer2[0] == 0
1879 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1880 )
1881 {
1882 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1883 goto RESPONSE_FAILED;
1884 }
1885 }
1886
1887 /* STARTTLS accepted: try to negotiate a TLS session. */
1888
1889 else
1890 TLS_NEGOTIATE:
1891 {
1892 address_item * addr;
1893 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1894 # ifdef EXPERIMENTAL_DANE
1895 , sx->dane ? &tlsa_dnsa : NULL
1896 # endif
1897 );
1898
1899 /* TLS negotiation failed; give an error. From outside, this function may
1900 be called again to try in clear on a new connection, if the options permit
1901 it for this host. */
1902
1903 if (rc != OK)
1904 {
1905 # ifdef EXPERIMENTAL_DANE
1906 if (sx->dane) log_write(0, LOG_MAIN,
1907 "DANE attempt failed; no TLS connection to %s [%s]",
1908 sx->host->name, sx->host->address);
1909 # endif
1910
1911 save_errno = ERRNO_TLSFAILURE;
1912 message = US"failure while setting up TLS session";
1913 sx->send_quit = FALSE;
1914 goto TLS_FAILED;
1915 }
1916
1917 /* TLS session is set up */
1918
1919 smtp_peer_options_wrap = smtp_peer_options;
1920 for (addr = sx->addrlist; addr; addr = addr->next)
1921 if (addr->transport_return == PENDING_DEFER)
1922 {
1923 addr->cipher = tls_out.cipher;
1924 addr->ourcert = tls_out.ourcert;
1925 addr->peercert = tls_out.peercert;
1926 addr->peerdn = tls_out.peerdn;
1927 addr->ocsp = tls_out.ocsp;
1928 }
1929 }
1930 }
1931
1932 /* if smtps, we'll have smtp_command set to something else; always safe to
1933 reset it here. */
1934 smtp_command = big_buffer;
1935
1936 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1937 helo_data is null, we are dealing with a connection that was passed from
1938 another process, and so we won't have expanded helo_data above. We have to
1939 expand it here. $sending_ip_address and $sending_port are set up right at the
1940 start of the Exim process (in exim.c). */
1941
1942 if (tls_out.active >= 0)
1943 {
1944 char *greeting_cmd;
1945 BOOL good_response;
1946
1947 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1948 {
1949 uschar *message = string_sprintf("failed to expand helo_data: %s",
1950 expand_string_message);
1951 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1952 yield = DEFER;
1953 goto SEND_QUIT;
1954 }
1955
1956 /* For SMTPS we need to wait for the initial OK response. */
1957 if (sx->smtps)
1958 {
1959 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1960 '2', sx->ob->command_timeout);
1961 #ifdef EXPERIMENTAL_DSN_INFO
1962 sx->smtp_greeting = string_copy(sx->buffer);
1963 #endif
1964 if (!good_response) goto RESPONSE_FAILED;
1965 }
1966
1967 if (sx->esmtp)
1968 greeting_cmd = "EHLO";
1969 else
1970 {
1971 greeting_cmd = "HELO";
1972 DEBUG(D_transport)
1973 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1974 }
1975
1976 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1977 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1978 goto SEND_FAILED;
1979 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1980 '2', sx->ob->command_timeout);
1981 #ifdef EXPERIMENTAL_DSN_INFO
1982 sx->helo_response = string_copy(sx->buffer);
1983 #endif
1984 if (!good_response) goto RESPONSE_FAILED;
1985 smtp_peer_options = 0;
1986 }
1987
1988 /* If the host is required to use a secure channel, ensure that we
1989 have one. */
1990
1991 else if ( sx->smtps
1992 # ifdef EXPERIMENTAL_DANE
1993 || sx->dane
1994 # endif
1995 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
1996 )
1997 {
1998 save_errno = ERRNO_TLSREQUIRED;
1999 message = string_sprintf("a TLS session is required, but %s",
2000 smtp_peer_options & PEER_OFFERED_TLS
2001 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2002 goto TLS_FAILED;
2003 }
2004 #endif /*SUPPORT_TLS*/
2005
2006 /* If TLS is active, we have just started it up and re-done the EHLO command,
2007 so its response needs to be analyzed. If TLS is not active and this is a
2008 continued session down a previously-used socket, we haven't just done EHLO, so
2009 we skip this. */
2010
2011 if (continue_hostname == NULL
2012 #ifdef SUPPORT_TLS
2013 || tls_out.active >= 0
2014 #endif
2015 )
2016 {
2017 if (sx->esmtp || sx->lmtp)
2018 {
2019 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2020 0 /* no TLS */
2021 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2022 | PEER_OFFERED_CHUNKING
2023 | PEER_OFFERED_PRDR
2024 #ifdef SUPPORT_I18N
2025 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2026 /*XXX if we hand peercaps on to continued-conn processes,
2027 must not depend on this addr */
2028 #endif
2029 | PEER_OFFERED_DSN
2030 | PEER_OFFERED_PIPE
2031 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2032 );
2033
2034 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2035 lmtp_ignore_quota option was set. */
2036
2037 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2038
2039 /* If the response to EHLO specified support for the SIZE parameter, note
2040 this, provided size_addition is non-negative. */
2041
2042 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2043
2044 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2045 the current host, esmtp will be false, so PIPELINING can never be used. If
2046 the current host matches hosts_avoid_pipelining, don't do it. */
2047
2048 if ( sx->peer_offered & PEER_OFFERED_PIPE
2049 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2050 smtp_peer_options |= PEER_OFFERED_PIPE;
2051
2052 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2053 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2054
2055 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2056 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2057 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2058
2059 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2060 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2061
2062 #ifndef DISABLE_PRDR
2063 if ( sx->peer_offered & PEER_OFFERED_PRDR
2064 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2065 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2066
2067 if (sx->peer_offered & PEER_OFFERED_PRDR)
2068 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2069 #endif
2070
2071 /* Note if the server supports DSN */
2072 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2073 DEBUG(D_transport) debug_printf("%susing DSN\n",
2074 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2075
2076 /* Note if the response to EHLO specifies support for the AUTH extension.
2077 If it has, check that this host is one we want to authenticate to, and do
2078 the business. The host name and address must be available when the
2079 authenticator's client driver is running. */
2080
2081 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2082 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2083 {
2084 default: goto SEND_QUIT;
2085 case OK: break;
2086 case FAIL_SEND: goto SEND_FAILED;
2087 case FAIL: goto RESPONSE_FAILED;
2088 }
2089 }
2090 }
2091 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2092
2093 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2094 message-specific. */
2095
2096 sx->setting_up = FALSE;
2097
2098 #ifdef SUPPORT_I18N
2099 if (sx->addrlist->prop.utf8_msg)
2100 {
2101 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2102 && !sx->addrlist->prop.utf8_downcvt_maybe;
2103 DEBUG(D_transport) if (!sx->utf8_needed)
2104 debug_printf("utf8: %s downconvert\n",
2105 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2106 }
2107
2108 /* If this is an international message we need the host to speak SMTPUTF8 */
2109 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2110 {
2111 errno = ERRNO_UTF8_FWD;
2112 goto RESPONSE_FAILED;
2113 }
2114 #endif
2115
2116 return OK;
2117
2118
2119 {
2120 int code;
2121 uschar * set_message;
2122
2123 RESPONSE_FAILED:
2124 {
2125 save_errno = errno;
2126 message = NULL;
2127 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2128 sx->buffer, &code, &message, &pass_message);
2129 goto FAILED;
2130 }
2131
2132 SEND_FAILED:
2133 {
2134 save_errno = errno;
2135 code = '4';
2136 message = US string_sprintf("send() to %s [%s] failed: %s",
2137 sx->host->name, sx->host->address, strerror(save_errno));
2138 sx->send_quit = FALSE;
2139 goto FAILED;
2140 }
2141
2142 /* This label is jumped to directly when a TLS negotiation has failed,
2143 or was not done for a host for which it is required. Values will be set
2144 in message and save_errno, and setting_up will always be true. Treat as
2145 a temporary error. */
2146
2147 #ifdef SUPPORT_TLS
2148 TLS_FAILED:
2149 code = '4';
2150 #endif
2151
2152 /* The failure happened while setting up the call; see if the failure was
2153 a 5xx response (this will either be on connection, or following HELO - a 5xx
2154 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2155 never going to accept them. For other errors during setting up (timeouts or
2156 whatever), defer all addresses, and yield DEFER, so that the host is not
2157 tried again for a while. */
2158
2159 FAILED:
2160 sx->ok = FALSE; /* For when reached by GOTO */
2161 set_message = message;
2162
2163 yield = code == '5'
2164 #ifdef SUPPORT_I18N
2165 || errno == ERRNO_UTF8_FWD
2166 #endif
2167 ? FAIL : DEFER;
2168
2169 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2170 #ifdef EXPERIMENTAL_DSN_INFO
2171 , sx->smtp_greeting, sx->helo_response
2172 #endif
2173 );
2174 }
2175
2176
2177 SEND_QUIT:
2178
2179 if (sx->send_quit)
2180 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2181
2182 #ifdef SUPPORT_TLS
2183 tls_close(FALSE, TRUE);
2184 #endif
2185
2186 /* Close the socket, and return the appropriate value, first setting
2187 works because the NULL setting is passed back to the calling process, and
2188 remote_max_parallel is forced to 1 when delivering over an existing connection,
2189
2190 If all went well and continue_more is set, we shouldn't actually get here if
2191 there are further addresses, as the return above will be taken. However,
2192 writing RSET might have failed, or there may be other addresses whose hosts are
2193 specified in the transports, and therefore not visible at top level, in which
2194 case continue_more won't get set. */
2195
2196 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2197 if (sx->send_quit)
2198 {
2199 shutdown(sx->outblock.sock, SHUT_WR);
2200 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2201 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2202 rc--; /* drain socket */
2203 sx->send_quit = FALSE;
2204 }
2205 (void)close(sx->inblock.sock);
2206 sx->inblock.sock = sx->outblock.sock = -1;
2207
2208 #ifndef DISABLE_EVENT
2209 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2210 #endif
2211
2212 continue_transport = NULL;
2213 continue_hostname = NULL;
2214 return yield;
2215 }
2216
2217
2218
2219
2220 /* Create the string of options that will be appended to the MAIL FROM:
2221 in the connection context buffer */
2222
2223 static int
2224 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2225 {
2226 uschar * p = sx->buffer;
2227 address_item * addr;
2228 int address_count;
2229
2230 *p = 0;
2231
2232 /* If we know the receiving MTA supports the SIZE qualification,
2233 send it, adding something to the message size to allow for imprecision
2234 and things that get added en route. Exim keeps the number of lines
2235 in a message, so we can give an accurate value for the original message, but we
2236 need some additional to handle added headers. (Double "." characters don't get
2237 included in the count.) */
2238
2239 if (sx->peer_offered & PEER_OFFERED_SIZE)
2240 {
2241 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2242 while (*p) p++;
2243 }
2244
2245 #ifndef DISABLE_PRDR
2246 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2247 request that */
2248
2249 sx->prdr_active = FALSE;
2250 if (sx->peer_offered & PEER_OFFERED_PRDR)
2251 for (addr = addrlist; addr; addr = addr->next)
2252 if (addr->transport_return == PENDING_DEFER)
2253 {
2254 for (addr = addr->next; addr; addr = addr->next)
2255 if (addr->transport_return == PENDING_DEFER)
2256 { /* at least two recipients to send */
2257 sx->prdr_active = TRUE;
2258 sprintf(CS p, " PRDR"); p += 5;
2259 break;
2260 }
2261 break;
2262 }
2263 #endif
2264
2265 #ifdef SUPPORT_I18N
2266 /* If it supports internationalised messages, and this meesage need that,
2267 request it */
2268
2269 if ( sx->peer_offered & PEER_OFFERED_UTF8
2270 && addrlist->prop.utf8_msg
2271 && !addrlist->prop.utf8_downcvt
2272 )
2273 Ustrcpy(p, " SMTPUTF8"), p += 9;
2274 #endif
2275
2276 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2277 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2278 addr && address_count < sx->max_rcpt;
2279 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2280 {
2281 address_count++;
2282 if (!(addr->dsn_flags & rf_dsnlasthop))
2283 {
2284 sx->dsn_all_lasthop = FALSE;
2285 break;
2286 }
2287 }
2288
2289 /* Add any DSN flags to the mail command */
2290
2291 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2292 {
2293 if (dsn_ret == dsn_ret_hdrs)
2294 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2295 else if (dsn_ret == dsn_ret_full)
2296 { Ustrcpy(p, " RET=FULL"); p += 9; }
2297
2298 if (dsn_envid)
2299 {
2300 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2301 while (*p) p++;
2302 }
2303 }
2304
2305 /* If an authenticated_sender override has been specified for this transport
2306 instance, expand it. If the expansion is forced to fail, and there was already
2307 an authenticated_sender for this message, the original value will be used.
2308 Other expansion failures are serious. An empty result is ignored, but there is
2309 otherwise no check - this feature is expected to be used with LMTP and other
2310 cases where non-standard addresses (e.g. without domains) might be required. */
2311
2312 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2313 return ERROR;
2314
2315 return OK;
2316 }
2317
2318
2319 static void
2320 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2321 {
2322 uschar * p = sx->buffer;
2323 *p = 0;
2324
2325 /* Add any DSN flags to the rcpt command */
2326
2327 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2328 {
2329 if (addr->dsn_flags & rf_dsnflags)
2330 {
2331 int i;
2332 BOOL first = TRUE;
2333
2334 Ustrcpy(p, " NOTIFY=");
2335 while (*p) p++;
2336 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2337 {
2338 if (!first) *p++ = ',';
2339 first = FALSE;
2340 Ustrcpy(p, rf_names[i]);
2341 while (*p) p++;
2342 }
2343 }
2344
2345 if (addr->dsn_orcpt)
2346 {
2347 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2348 addr->dsn_orcpt);
2349 while (*p) p++;
2350 }
2351 }
2352 }
2353
2354
2355
2356 /*
2357 Return:
2358 0 good
2359 -1 MAIL response error, any read i/o error
2360 -2 non-MAIL response timeout
2361 -3 internal error; channel still usable
2362 -4 transmit failed
2363 */
2364
2365 int
2366 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2367 {
2368 address_item * addr;
2369 int address_count;
2370 int rc;
2371
2372 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2373 {
2374 *yield = ERROR;
2375 return -3;
2376 }
2377
2378 /* From here until we send the DATA command, we can make use of PIPELINING
2379 if the server host supports it. The code has to be able to check the responses
2380 at any point, for when the buffer fills up, so we write it totally generally.
2381 When PIPELINING is off, each command written reports that it has flushed the
2382 buffer. */
2383
2384 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2385
2386 {
2387 uschar * s = sx->from_addr;
2388 #ifdef SUPPORT_I18N
2389 uschar * errstr = NULL;
2390
2391 /* If we must downconvert, do the from-address here. Remember we had to
2392 for the to-addresses (done below), and also (ugly) for re-doing when building
2393 the delivery log line. */
2394
2395 if ( sx->addrlist->prop.utf8_msg
2396 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2397 )
2398 {
2399 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2400 {
2401 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2402 *yield = ERROR;
2403 return -3;
2404 }
2405 setflag(sx->addrlist, af_utf8_downcvt);
2406 }
2407 #endif
2408
2409 rc = smtp_write_command(&sx->outblock, pipelining_active,
2410 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2411 }
2412
2413 mail_command = string_copy(big_buffer); /* Save for later error message */
2414
2415 switch(rc)
2416 {
2417 case -1: /* Transmission error */
2418 return -4;
2419
2420 case +1: /* Cmd was sent */
2421 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2422 sx->ob->command_timeout))
2423 {
2424 if (errno == 0 && sx->buffer[0] == '4')
2425 {
2426 errno = ERRNO_MAIL4XX;
2427 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2428 }
2429 return -1;
2430 }
2431 sx->pending_MAIL = FALSE;
2432 break;
2433 }
2434
2435 /* Pass over all the relevant recipient addresses for this host, which are the
2436 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2437 several before we have to read the responses for those seen so far. This
2438 checking is done by a subroutine because it also needs to be done at the end.
2439 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2440 the next one if not all are sent.
2441
2442 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2443 last address because we want to abort if any recipients have any kind of
2444 problem, temporary or permanent. We know that all recipient addresses will have
2445 the PENDING_DEFER status, because only one attempt is ever made, and we know
2446 that max_rcpt will be large, so all addresses will be done at once. */
2447
2448 for (addr = sx->first_addr, address_count = 0;
2449 addr && address_count < sx->max_rcpt;
2450 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2451 {
2452 int count;
2453 BOOL no_flush;
2454 uschar * rcpt_addr;
2455
2456 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2457 ? dsn_support_yes : dsn_support_no;
2458
2459 address_count++;
2460 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2461
2462 build_rcptcmd_options(sx, addr);
2463
2464 /* Now send the RCPT command, and process outstanding responses when
2465 necessary. After a timeout on RCPT, we just end the function, leaving the
2466 yield as OK, because this error can often mean that there is a problem with
2467 just one address, so we don't want to delay the host. */
2468
2469 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2470
2471 #ifdef SUPPORT_I18N
2472 if ( testflag(sx->addrlist, af_utf8_downcvt)
2473 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2474 )
2475 {
2476 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2477 errno = ERRNO_EXPANDFAIL;
2478 return -4; /*XXX too harsh? */
2479 }
2480 #endif
2481
2482 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2483 rcpt_addr, sx->igquotstr, sx->buffer);
2484
2485 if (count < 0) return -4;
2486 if (count > 0)
2487 {
2488 switch(sync_responses(sx, count, 0))
2489 {
2490 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2491 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2492 break;
2493
2494 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2495 if (!sx->lmtp) /* can't tell about progress yet */
2496 sx->completed_addr = TRUE;
2497 case 0: /* No 2xx or 5xx, but no probs */
2498 break;
2499
2500 case -1: return -2; /* Timeout on RCPT */
2501 default: return -1; /* I/O error, or any MAIL error */
2502 }
2503 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2504 }
2505 } /* Loop for next address */
2506
2507 sx->next_addr = addr;
2508 return 0;
2509 }
2510
2511
2512 /*************************************************
2513 * Deliver address list to given host *
2514 *************************************************/
2515
2516 /* If continue_hostname is not null, we get here only when continuing to
2517 deliver down an existing channel. The channel was passed as the standard
2518 input. TLS is never active on a passed channel; the previous process always
2519 closes it down before passing the connection on.
2520
2521 Otherwise, we have to make a connection to the remote host, and do the
2522 initial protocol exchange.
2523
2524 When running as an MUA wrapper, if the sender or any recipient is rejected,
2525 temporarily or permanently, we force failure for all recipients.
2526
2527 Arguments:
2528 addrlist chain of potential addresses to deliver; only those whose
2529 transport_return field is set to PENDING_DEFER are currently
2530 being processed; others should be skipped - they have either
2531 been delivered to an earlier host or IP address, or been
2532 failed by one of them.
2533 host host to deliver to
2534 host_af AF_INET or AF_INET6
2535 port default TCP/IP port to use, in host byte order
2536 interface interface to bind to, or NULL
2537 tblock transport instance block
2538 message_defer set TRUE if yield is OK, but all addresses were deferred
2539 because of a non-recipient, non-host failure, that is, a
2540 4xx response to MAIL FROM, DATA, or ".". This is a defer
2541 that is specific to the message.
2542 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2543 a second attempt after TLS initialization fails
2544
2545 Returns: OK - the connection was made and the delivery attempted;
2546 the result for each address is in its data block.
2547 DEFER - the connection could not be made, or something failed
2548 while setting up the SMTP session, or there was a
2549 non-message-specific error, such as a timeout.
2550 ERROR - a filter command is specified for this transport,
2551 and there was a problem setting it up; OR helo_data
2552 or add_headers or authenticated_sender is specified
2553 for this transport, and the string failed to expand
2554 */
2555
2556 static int
2557 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2558 uschar *interface, transport_instance *tblock,
2559 BOOL *message_defer, BOOL suppress_tls)
2560 {
2561 address_item *addr;
2562 int yield = OK;
2563 int save_errno;
2564 int rc;
2565 time_t start_delivery_time = time(NULL);
2566
2567 BOOL pass_message = FALSE;
2568 uschar *message = NULL;
2569 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2570 uschar *p;
2571
2572 smtp_context sx;
2573
2574 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2575 *message_defer = FALSE;
2576
2577 sx.addrlist = addrlist;
2578 sx.host = host;
2579 sx.host_af = host_af,
2580 sx.port = port;
2581 sx.interface = interface;
2582 sx.helo_data = NULL;
2583 sx.tblock = tblock;
2584
2585 /* Get the channel set up ready for a message (MAIL FROM being the next
2586 SMTP command to send */
2587
2588 if ((rc = smtp_setup_conn(&sx, suppress_tls, FALSE)) != OK)
2589 return rc;
2590
2591 /* If there is a filter command specified for this transport, we can now
2592 set it up. This cannot be done until the identify of the host is known. */
2593
2594 if (tblock->filter_command != NULL)
2595 {
2596 BOOL rc;
2597 uschar fbuf[64];
2598 sprintf(CS fbuf, "%.50s transport", tblock->name);
2599 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2600 TRUE, DEFER, addrlist, fbuf, NULL);
2601 transport_filter_timeout = tblock->filter_timeout;
2602
2603 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2604 yield ERROR. */
2605
2606 if (!rc)
2607 {
2608 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2609 FALSE);
2610 yield = ERROR;
2611 goto SEND_QUIT;
2612 }
2613
2614 if ( transport_filter_argv
2615 && *transport_filter_argv
2616 && **transport_filter_argv
2617 && sx.peer_offered & PEER_OFFERED_CHUNKING
2618 )
2619 {
2620 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2621 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2622 }
2623 }
2624
2625
2626 /* For messages that have more than the maximum number of envelope recipients,
2627 we want to send several transactions down the same SMTP connection. (See
2628 comments in deliver.c as to how this reconciles, heuristically, with
2629 remote_max_parallel.) This optimization was added to Exim after the following
2630 code was already working. The simplest way to put it in without disturbing the
2631 code was to use a goto to jump back to this point when there is another
2632 transaction to handle. */
2633
2634 SEND_MESSAGE:
2635 sx.from_addr = return_path;
2636 sx.first_addr = sx.sync_addr = addrlist;
2637 sx.ok = FALSE;
2638 sx.send_rset = TRUE;
2639 sx.completed_addr = FALSE;
2640
2641
2642 /* Initiate a message transfer. */
2643
2644 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2645 {
2646 case 0: break;
2647 case -1: goto RESPONSE_FAILED;
2648 case -2: goto END_OFF;
2649 case -3: goto SEND_QUIT;
2650 default: goto SEND_FAILED;
2651 }
2652
2653 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2654 permanently or temporarily. We should have flushed and synced after the last
2655 RCPT. */
2656
2657 if (mua_wrapper)
2658 {
2659 address_item *badaddr;
2660 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2661 if (badaddr->transport_return != PENDING_OK)
2662 {
2663 /*XXX could we find a better errno than 0 here? */
2664 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2665 testflag(badaddr, af_pass_message));
2666 sx.ok = FALSE;
2667 break;
2668 }
2669 }
2670
2671 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2672 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2673 have a good recipient buffered up if we are pipelining. We don't want to waste
2674 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2675 are pipelining. The responses are all handled by sync_responses().
2676 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2677 to send is. */
2678
2679 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2680 && (sx.ok || (pipelining_active && !mua_wrapper)))
2681 {
2682 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2683
2684 if (count < 0) goto SEND_FAILED;
2685 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2686 {
2687 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2688 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2689 break;
2690
2691 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2692 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2693 case 0: break; /* No 2xx or 5xx, but no probs */
2694
2695 case -1: goto END_OFF; /* Timeout on RCPT */
2696 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2697 }
2698 pipelining_active = FALSE;
2699 data_command = string_copy(big_buffer); /* Save for later error message */
2700 }
2701
2702 /* If there were no good recipients (but otherwise there have been no
2703 problems), just set ok TRUE, since we have handled address-specific errors
2704 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2705 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2706 well as body. Set the appropriate timeout value to be used for each chunk.
2707 (Haven't been able to make it work using select() for writing yet.) */
2708
2709 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2710 {
2711 /* Save the first address of the next batch. */
2712 sx.first_addr = sx.next_addr;
2713
2714 sx.ok = TRUE;
2715 }
2716 else
2717 {
2718 transport_ctx tctx = {
2719 tblock,
2720 addrlist,
2721 US".", US"..", /* Escaping strings */
2722 topt_use_crlf | topt_escape_headers
2723 | (tblock->body_only ? topt_no_headers : 0)
2724 | (tblock->headers_only ? topt_no_body : 0)
2725 | (tblock->return_path_add ? topt_add_return_path : 0)
2726 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2727 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2728 };
2729
2730 /* If using CHUNKING we need a callback from the generic transport
2731 support to us, for the sending of BDAT smtp commands and the reaping
2732 of responses. The callback needs a whole bunch of state so set up
2733 a transport-context structure to be passed around. */
2734
2735 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2736 {
2737 tctx.check_string = tctx.escape_string = NULL;
2738 tctx.options |= topt_use_bdat;
2739 tctx.chunk_cb = smtp_chunk_cmd_callback;
2740 tctx.inblock = &sx.inblock;
2741 tctx.outblock = &sx.outblock;
2742 tctx.host = host;
2743 tctx.first_addr = sx.first_addr;
2744 tctx.sync_addr = &sx.sync_addr;
2745 tctx.pending_MAIL = sx.pending_MAIL;
2746 tctx.pending_BDAT = FALSE;
2747 tctx.good_RCPT = sx.ok;
2748 tctx.completed_address = &sx.completed_addr;
2749 tctx.cmd_count = 0;
2750 tctx.buffer = sx.buffer;
2751 }
2752 else
2753 tctx.options |= topt_end_dot;
2754
2755 /* Save the first address of the next batch. */
2756 sx.first_addr = sx.next_addr;
2757
2758 /* Responses from CHUNKING commands go in buffer. Otherwise,
2759 there has not been a response. */
2760
2761 sx.buffer[0] = 0;
2762
2763 sigalrm_seen = FALSE;
2764 transport_write_timeout = sx.ob->data_timeout;
2765 smtp_command = US"sending data block"; /* For error messages */
2766 DEBUG(D_transport|D_v)
2767 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2768 debug_printf(" will write message using CHUNKING\n");
2769 else
2770 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2771 transport_count = 0;
2772
2773 #ifndef DISABLE_DKIM
2774 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2775 #else
2776 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2777 #endif
2778
2779 /* transport_write_message() uses write() because it is called from other
2780 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2781 it can exit with "Broken pipe" as its error. This really means that the
2782 socket got closed at the far end. */
2783
2784 transport_write_timeout = 0; /* for subsequent transports */
2785
2786 /* Failure can either be some kind of I/O disaster (including timeout),
2787 or the failure of a transport filter or the expansion of added headers.
2788 Or, when CHUNKING, it can be a protocol-detected failure. */
2789
2790 if (!sx.ok)
2791 goto RESPONSE_FAILED;
2792
2793 /* We used to send the terminating "." explicitly here, but because of
2794 buffering effects at both ends of TCP/IP connections, you don't gain
2795 anything by keeping it separate, so it might as well go in the final
2796 data buffer for efficiency. This is now done by setting the topt_end_dot
2797 flag above. */
2798
2799 smtp_command = US"end of data";
2800
2801 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2802 {
2803 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2804 switch(sync_responses(&sx, tctx.cmd_count-1, 0))
2805 {
2806 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2807 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2808 break;
2809
2810 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2811 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2812 case 0: break; /* No 2xx or 5xx, but no probs */
2813
2814 case -1: goto END_OFF; /* Timeout on RCPT */
2815 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2816 }
2817 }
2818
2819 #ifndef DISABLE_PRDR
2820 /* For PRDR we optionally get a partial-responses warning
2821 * followed by the individual responses, before going on with
2822 * the overall response. If we don't get the warning then deal
2823 * with per non-PRDR. */
2824 if(sx.prdr_active)
2825 {
2826 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2827 sx.ob->final_timeout);
2828 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2829 {
2830 case '2': sx.prdr_active = FALSE;
2831 sx.ok = TRUE;
2832 break;
2833 case '4': errno = ERRNO_DATA4XX;
2834 addrlist->more_errno |=
2835 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2836 break;
2837 }
2838 }
2839 else
2840 #endif
2841
2842 /* For non-PRDR SMTP, we now read a single response that applies to the
2843 whole message. If it is OK, then all the addresses have been delivered. */
2844
2845 if (!sx.lmtp)
2846 {
2847 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2848 sx.ob->final_timeout);
2849 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2850 {
2851 errno = ERRNO_DATA4XX;
2852 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2853 }
2854 }
2855
2856 /* For LMTP, we get back a response for every RCPT command that we sent;
2857 some may be accepted and some rejected. For those that get a response, their
2858 status is fixed; any that are accepted have been handed over, even if later
2859 responses crash - at least, that's how I read RFC 2033.
2860
2861 If all went well, mark the recipient addresses as completed, record which
2862 host/IPaddress they were delivered to, and cut out RSET when sending another
2863 message down the same channel. Write the completed addresses to the journal
2864 now so that they are recorded in case there is a crash of hardware or
2865 software before the spool gets updated. Also record the final SMTP
2866 confirmation if needed (for SMTP only). */
2867
2868 if (sx.ok)
2869 {
2870 int flag = '=';
2871 int delivery_time = (int)(time(NULL) - start_delivery_time);
2872 int len;
2873 uschar *conf = NULL;
2874
2875 sx.send_rset = FALSE;
2876 pipelining_active = FALSE;
2877
2878 /* Set up confirmation if needed - applies only to SMTP */
2879
2880 if (
2881 #ifdef DISABLE_EVENT
2882 LOGGING(smtp_confirmation) &&
2883 #endif
2884 !sx.lmtp
2885 )
2886 {
2887 const uschar *s = string_printing(sx.buffer);
2888 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2889 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2890 }
2891
2892 /* Process all transported addresses - for LMTP or PRDR, read a status for
2893 each one. */
2894
2895 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2896 {
2897 if (addr->transport_return != PENDING_OK) continue;
2898
2899 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2900 remaining addresses. Otherwise, it's a return code for just the one
2901 address. For temporary errors, add a retry item for the address so that
2902 it doesn't get tried again too soon. */
2903
2904 #ifndef DISABLE_PRDR
2905 if (sx.lmtp || sx.prdr_active)
2906 #else
2907 if (sx.lmtp)
2908 #endif
2909 {
2910 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2911 sx.ob->final_timeout))
2912 {
2913 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2914 addr->message = string_sprintf(
2915 #ifndef DISABLE_PRDR
2916 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2917 #else
2918 "LMTP error after %s: %s",
2919 #endif
2920 data_command, string_printing(sx.buffer));
2921 setflag(addr, af_pass_message); /* Allow message to go to user */
2922 if (sx.buffer[0] == '5')
2923 addr->transport_return = FAIL;
2924 else
2925 {
2926 errno = ERRNO_DATA4XX;
2927 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2928 addr->transport_return = DEFER;
2929 #ifndef DISABLE_PRDR
2930 if (!sx.prdr_active)
2931 #endif
2932 retry_add_item(addr, addr->address_retry_key, 0);
2933 }
2934 continue;
2935 }
2936 sx.completed_addr = TRUE; /* NOW we can set this flag */
2937 if (LOGGING(smtp_confirmation))
2938 {
2939 const uschar *s = string_printing(sx.buffer);
2940 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2941 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2942 }
2943 }
2944
2945 /* SMTP, or success return from LMTP for this address. Pass back the
2946 actual host that was used. */
2947
2948 addr->transport_return = OK;
2949 addr->more_errno = delivery_time;
2950 addr->host_used = host;
2951 addr->special_action = flag;
2952 addr->message = conf;
2953 #ifndef DISABLE_PRDR
2954 if (sx.prdr_active) addr->flags |= af_prdr_used;
2955 #endif
2956 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2957 flag = '-';
2958
2959 #ifndef DISABLE_PRDR
2960 if (!sx.prdr_active)
2961 #endif
2962 {
2963 /* Update the journal. For homonymic addresses, use the base address plus
2964 the transport name. See lots of comments in deliver.c about the reasons
2965 for the complications when homonyms are involved. Just carry on after
2966 write error, as it may prove possible to update the spool file later. */
2967
2968 if (testflag(addr, af_homonym))
2969 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2970 else
2971 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2972
2973 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2974 len = Ustrlen(CS sx.buffer);
2975 if (write(journal_fd, sx.buffer, len) != len)
2976 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2977 "%s: %s", sx.buffer, strerror(errno));
2978 }
2979 }
2980
2981 #ifndef DISABLE_PRDR
2982 if (sx.prdr_active)
2983 {
2984 /* PRDR - get the final, overall response. For any non-success
2985 upgrade all the address statuses. */
2986 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2987 sx.ob->final_timeout);
2988 if (!sx.ok)
2989 {
2990 if(errno == 0 && sx.buffer[0] == '4')
2991 {
2992 errno = ERRNO_DATA4XX;
2993 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2994 }
2995 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2996 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2997 addr->transport_return = PENDING_OK; /* allow set_errno action */
2998 goto RESPONSE_FAILED;
2999 }
3000
3001 /* Update the journal, or setup retry. */
3002 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3003 if (addr->transport_return == OK)
3004 {
3005 if (testflag(addr, af_homonym))
3006 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3007 else
3008 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3009
3010 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3011 len = Ustrlen(CS sx.buffer);
3012 if (write(journal_fd, sx.buffer, len) != len)
3013 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3014 "%s: %s", sx.buffer, strerror(errno));
3015 }
3016 else if (addr->transport_return == DEFER)
3017 retry_add_item(addr, addr->address_retry_key, -2);
3018 }
3019 #endif
3020
3021 /* Ensure the journal file is pushed out to disk. */
3022
3023 if (EXIMfsync(journal_fd) < 0)
3024 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3025 strerror(errno));
3026 }
3027 }
3028
3029
3030 /* Handle general (not specific to one address) failures here. The value of ok
3031 is used to skip over this code on the falling through case. A timeout causes a
3032 deferral. Other errors may defer or fail according to the response code, and
3033 may set up a special errno value, e.g. after connection chopped, which is
3034 assumed if errno == 0 and there is no text in the buffer. If control reaches
3035 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3036 the problem is not related to this specific message. */
3037
3038 if (!sx.ok)
3039 {
3040 int code, set_rc;
3041 uschar * set_message;
3042
3043 RESPONSE_FAILED:
3044 {
3045 save_errno = errno;
3046 message = NULL;
3047 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3048 sx.buffer, &code, &message, &pass_message);
3049 goto FAILED;
3050 }
3051
3052 SEND_FAILED:
3053 {
3054 save_errno = errno;
3055 code = '4';
3056 message = US string_sprintf("send() to %s [%s] failed: %s",
3057 host->name, host->address, strerror(save_errno));
3058 sx.send_quit = FALSE;
3059 goto FAILED;
3060 }
3061
3062 FAILED:
3063 {
3064 BOOL message_error;
3065
3066 sx.ok = FALSE; /* For when reached by GOTO */
3067 set_message = message;
3068
3069 /* We want to handle timeouts after MAIL or "." and loss of connection after
3070 "." specially. They can indicate a problem with the sender address or with
3071 the contents of the message rather than a real error on the connection. These
3072 cases are treated in the same way as a 4xx response. This next bit of code
3073 does the classification. */
3074
3075 switch(save_errno)
3076 {
3077 case 0:
3078 case ERRNO_MAIL4XX:
3079 case ERRNO_DATA4XX:
3080 message_error = TRUE;
3081 break;
3082
3083 case ETIMEDOUT:
3084 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3085 Ustrncmp(smtp_command,"end ",4) == 0;
3086 break;
3087
3088 case ERRNO_SMTPCLOSED:
3089 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3090 break;
3091
3092 default:
3093 message_error = FALSE;
3094 break;
3095 }
3096
3097 /* Handle the cases that are treated as message errors. These are:
3098
3099 (a) negative response or timeout after MAIL
3100 (b) negative response after DATA
3101 (c) negative response or timeout or dropped connection after "."
3102 (d) utf8 support required and not offered
3103
3104 It won't be a negative response or timeout after RCPT, as that is dealt
3105 with separately above. The action in all cases is to set an appropriate
3106 error code for all the addresses, but to leave yield set to OK because the
3107 host itself has not failed. Of course, it might in practice have failed
3108 when we've had a timeout, but if so, we'll discover that at the next
3109 delivery attempt. For a temporary error, set the message_defer flag, and
3110 write to the logs for information if this is not the last host. The error
3111 for the last host will be logged as part of the address's log line. */
3112
3113 if (message_error)
3114 {
3115 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3116
3117 /* If there's an errno, the message contains just the identity of
3118 the host. */
3119
3120 if (code == '5')
3121 set_rc = FAIL;
3122 else /* Anything other than 5 is treated as temporary */
3123 {
3124 set_rc = DEFER;
3125 if (save_errno > 0)
3126 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3127 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3128 msglog_line(host, message);
3129 *message_defer = TRUE;
3130 }
3131 }
3132
3133 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3134 ".", or some other transportation error. We defer all addresses and yield
3135 DEFER, except for the case of failed add_headers expansion, or a transport
3136 filter failure, when the yield should be ERROR, to stop it trying other
3137 hosts. */
3138
3139 else
3140 {
3141 set_rc = DEFER;
3142 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3143 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3144 }
3145 }
3146
3147 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3148 #ifdef EXPERIMENTAL_DSN_INFO
3149 , sx.smtp_greeting, sx.helo_response
3150 #endif
3151 );
3152 }
3153
3154
3155 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3156 SMTP session tidily. However, if there were too many addresses to send in one
3157 message (indicated by first_addr being non-NULL) we want to carry on with the
3158 rest of them. Also, it is desirable to send more than one message down the SMTP
3159 connection if there are several waiting, provided we haven't already sent so
3160 many as to hit the configured limit. The function transport_check_waiting looks
3161 for a waiting message and returns its id. Then transport_pass_socket tries to
3162 set up a continued delivery by passing the socket on to another process. The
3163 variable send_rset is FALSE if a message has just been successfully transfered.
3164
3165 If we are already sending down a continued channel, there may be further
3166 addresses not yet delivered that are aimed at the same host, but which have not
3167 been passed in this run of the transport. In this case, continue_more will be
3168 true, and all we should do is send RSET if necessary, and return, leaving the
3169 channel open.
3170
3171 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3172 do not want to continue with other messages down the same channel, because that
3173 can lead to looping between two or more messages, all with the same,
3174 temporarily failing address(es). [The retry information isn't updated yet, so
3175 new processes keep on trying.] We probably also don't want to try more of this
3176 message's addresses either.
3177
3178 If we have started a TLS session, we have to end it before passing the
3179 connection to a new process. However, not all servers can handle this (Exim
3180 can), so we do not pass such a connection on if the host matches
3181 hosts_nopass_tls. */
3182
3183 DEBUG(D_transport)
3184 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3185 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3186 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3187
3188 if (sx.completed_addr && sx.ok && sx.send_quit)
3189 {
3190 BOOL more;
3191 smtp_compare_t t_compare;
3192
3193 t_compare.tblock = tblock;
3194 t_compare.current_sender_address = sender_address;
3195
3196 if ( sx.first_addr != NULL
3197 || continue_more
3198 || ( ( tls_out.active < 0
3199 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3200 )
3201 &&
3202 transport_check_waiting(tblock->name, host->name,
3203 tblock->connection_max_messages, new_message_id, &more,
3204 (oicf)smtp_are_same_identities, (void*)&t_compare)
3205 ) )
3206 {
3207 uschar *msg;
3208 BOOL pass_message;
3209
3210 if (sx.send_rset)
3211 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3212 {
3213 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3214 host->address, strerror(save_errno));
3215 sx.send_quit = FALSE;
3216 }
3217 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3218 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3219 {
3220 int code;
3221 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3222 &pass_message);
3223 if (!sx.send_quit)
3224 {
3225 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3226 host->name, host->address, msg);
3227 }
3228 }
3229
3230 /* Either RSET was not needed, or it succeeded */
3231
3232 if (sx.ok)
3233 {
3234 if (sx.first_addr != NULL) /* More addresses still to be sent */
3235 { /* in this run of the transport */
3236 continue_sequence++; /* Causes * in logging */
3237 goto SEND_MESSAGE;
3238 }
3239 if (continue_more) return yield; /* More addresses for another run */
3240
3241 /* Pass the socket to a new Exim process. Before doing so, we must shut
3242 down TLS. Not all MTAs allow for the continuation of the SMTP session
3243 when TLS is shut down. We test for this by sending a new EHLO. If we
3244 don't get a good response, we don't attempt to pass the socket on. */
3245
3246 #ifdef SUPPORT_TLS
3247 if (tls_out.active >= 0)
3248 {
3249 tls_close(FALSE, TRUE);
3250 smtp_peer_options = smtp_peer_options_wrap;
3251 sx.ok = !sx.smtps
3252 && smtp_write_command(&sx.outblock, FALSE,
3253 "EHLO %s\r\n", sx.helo_data) >= 0
3254 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3255 '2', sx.ob->command_timeout);
3256 }
3257 #endif
3258
3259 /* If the socket is successfully passed, we mustn't send QUIT (or
3260 indeed anything!) from here. */
3261
3262 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3263 propagate it from the initial
3264 */
3265 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3266 host->address, new_message_id, sx.inblock.sock))
3267 sx.send_quit = FALSE;
3268 }
3269
3270 /* If RSET failed and there are addresses left, they get deferred. */
3271
3272 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 , sx.smtp_greeting, sx.helo_response
3275 #endif
3276 );
3277 }
3278 }
3279
3280 /* End off tidily with QUIT unless the connection has died or the socket has
3281 been passed to another process. There has been discussion on the net about what
3282 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3283 to wait for a response, but on the other hand, there isn't anything one can do
3284 with an error response, other than log it. Exim used to do that. However,
3285 further discussion suggested that it is positively advantageous not to wait for
3286 the response, but to close the session immediately. This is supposed to move
3287 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3288 load from the server. (Hosts that are both servers and clients may not see much
3289 difference, of course.) Further discussion indicated that this was safe to do
3290 on Unix systems which have decent implementations of TCP/IP that leave the
3291 connection around for a while (TIME_WAIT) after the application has gone away.
3292 This enables the response sent by the server to be properly ACKed rather than
3293 timed out, as can happen on broken TCP/IP implementations on other OS.
3294
3295 This change is being made on 31-Jul-98. After over a year of trouble-free
3296 operation, the old commented-out code was removed on 17-Sep-99. */
3297
3298 SEND_QUIT:
3299 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3300
3301 END_OFF:
3302
3303 #ifdef SUPPORT_TLS
3304 tls_close(FALSE, TRUE);
3305 #endif
3306
3307 /* Close the socket, and return the appropriate value, first setting
3308 works because the NULL setting is passed back to the calling process, and
3309 remote_max_parallel is forced to 1 when delivering over an existing connection,
3310
3311 If all went well and continue_more is set, we shouldn't actually get here if
3312 there are further addresses, as the return above will be taken. However,
3313 writing RSET might have failed, or there may be other addresses whose hosts are
3314 specified in the transports, and therefore not visible at top level, in which
3315 case continue_more won't get set. */
3316
3317 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3318 if (sx.send_quit)
3319 {
3320 shutdown(sx.outblock.sock, SHUT_WR);
3321 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3322 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3323 rc--; /* drain socket */
3324 }
3325 (void)close(sx.inblock.sock);
3326
3327 #ifndef DISABLE_EVENT
3328 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3329 #endif
3330
3331 continue_transport = NULL;
3332 continue_hostname = NULL;
3333 return yield;
3334 }
3335
3336
3337
3338
3339 /*************************************************
3340 * Closedown entry point *
3341 *************************************************/
3342
3343 /* This function is called when exim is passed an open smtp channel
3344 from another incarnation, but the message which it has been asked
3345 to deliver no longer exists. The channel is on stdin.
3346
3347 We might do fancy things like looking for another message to send down
3348 the channel, but if the one we sought has gone, it has probably been
3349 delivered by some other process that itself will seek further messages,
3350 so just close down our connection.
3351
3352 Argument: pointer to the transport instance block
3353 Returns: nothing
3354 */
3355
3356 void
3357 smtp_transport_closedown(transport_instance *tblock)
3358 {
3359 smtp_transport_options_block *ob =
3360 (smtp_transport_options_block *)tblock->options_block;
3361 smtp_inblock inblock;
3362 smtp_outblock outblock;
3363 uschar buffer[256];
3364 uschar inbuffer[4096];
3365 uschar outbuffer[16];
3366
3367 inblock.sock = fileno(stdin);
3368 inblock.buffer = inbuffer;
3369 inblock.buffersize = sizeof(inbuffer);
3370 inblock.ptr = inbuffer;
3371 inblock.ptrend = inbuffer;
3372
3373 outblock.sock = inblock.sock;
3374 outblock.buffersize = sizeof(outbuffer);
3375 outblock.buffer = outbuffer;
3376 outblock.ptr = outbuffer;
3377 outblock.cmd_count = 0;
3378 outblock.authenticating = FALSE;
3379
3380 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3381 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3382 ob->command_timeout);
3383 (void)close(inblock.sock);
3384 }
3385
3386
3387
3388 /*************************************************
3389 * Prepare addresses for delivery *
3390 *************************************************/
3391
3392 /* This function is called to flush out error settings from previous delivery
3393 attempts to other hosts. It also records whether we got here via an MX record
3394 or not in the more_errno field of the address. We are interested only in
3395 addresses that are still marked DEFER - others may have got delivered to a
3396 previously considered IP address. Set their status to PENDING_DEFER to indicate
3397 which ones are relevant this time.
3398
3399 Arguments:
3400 addrlist the list of addresses
3401 host the host we are delivering to
3402
3403 Returns: the first address for this delivery
3404 */
3405
3406 static address_item *
3407 prepare_addresses(address_item *addrlist, host_item *host)
3408 {
3409 address_item *first_addr = NULL;
3410 address_item *addr;
3411 for (addr = addrlist; addr; addr = addr->next)
3412 if (addr->transport_return == DEFER)
3413 {
3414 if (!first_addr) first_addr = addr;
3415 addr->transport_return = PENDING_DEFER;
3416 addr->basic_errno = 0;
3417 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3418 addr->message = NULL;
3419 #ifdef SUPPORT_TLS
3420 addr->cipher = NULL;
3421 addr->ourcert = NULL;
3422 addr->peercert = NULL;
3423 addr->peerdn = NULL;
3424 addr->ocsp = OCSP_NOT_REQ;
3425 #endif
3426 #ifdef EXPERIMENTAL_DSN_INFO
3427 addr->smtp_greeting = NULL;
3428 addr->helo_response = NULL;
3429 #endif
3430 }
3431 return first_addr;
3432 }
3433
3434
3435
3436 /*************************************************
3437 * Main entry point *
3438 *************************************************/
3439
3440 /* See local README for interface details. As this is a remote transport, it is
3441 given a chain of addresses to be delivered in one connection, if possible. It
3442 always returns TRUE, indicating that each address has its own independent
3443 status set, except if there is a setting up problem, in which case it returns
3444 FALSE. */
3445
3446 BOOL
3447 smtp_transport_entry(
3448 transport_instance *tblock, /* data for this instantiation */
3449 address_item *addrlist) /* addresses we are working on */
3450 {
3451 int cutoff_retry;
3452 int port;
3453 int hosts_defer = 0;
3454 int hosts_fail = 0;
3455 int hosts_looked_up = 0;
3456 int hosts_retry = 0;
3457 int hosts_serial = 0;
3458 int hosts_total = 0;
3459 int total_hosts_tried = 0;
3460 address_item *addr;
3461 BOOL expired = TRUE;
3462 uschar *expanded_hosts = NULL;
3463 uschar *pistring;
3464 uschar *tid = string_sprintf("%s transport", tblock->name);
3465 smtp_transport_options_block *ob =
3466 (smtp_transport_options_block *)(tblock->options_block);
3467 host_item *hostlist = addrlist->host_list;
3468 host_item *host = NULL;
3469
3470 DEBUG(D_transport)
3471 {
3472 debug_printf("%s transport entered\n", tblock->name);
3473 for (addr = addrlist; addr; addr = addr->next)
3474 debug_printf(" %s\n", addr->address);
3475 if (hostlist)
3476 {
3477 debug_printf("hostlist:\n");
3478 for (host = hostlist; host; host = host->next)
3479 debug_printf(" %s:%d\n", host->name, host->port);
3480 }
3481 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3482 continue_hostname, continue_host_address);
3483 }
3484
3485 /* Set the flag requesting that these hosts be added to the waiting
3486 database if the delivery fails temporarily or if we are running with
3487 queue_smtp or a 2-stage queue run. This gets unset for certain
3488 kinds of error, typically those that are specific to the message. */
3489
3490 update_waiting = TRUE;
3491
3492 /* If a host list is not defined for the addresses - they must all have the
3493 same one in order to be passed to a single transport - or if the transport has
3494 a host list with hosts_override set, use the host list supplied with the
3495 transport. It is an error for this not to exist. */
3496
3497 if (!hostlist || (ob->hosts_override && ob->hosts))
3498 {
3499 if (!ob->hosts)
3500 {
3501 addrlist->message = string_sprintf("%s transport called with no hosts set",
3502 tblock->name);
3503 addrlist->transport_return = PANIC;
3504 return FALSE; /* Only top address has status */
3505 }
3506
3507 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3508 ob->hosts);
3509
3510 /* If the transport's host list contains no '$' characters, and we are not
3511 randomizing, it is fixed and therefore a chain of hosts can be built once
3512 and for all, and remembered for subsequent use by other calls to this
3513 transport. If, on the other hand, the host list does contain '$', or we are
3514 randomizing its order, we have to rebuild it each time. In the fixed case,
3515 as the hosts string will never be used again, it doesn't matter that we
3516 replace all the : characters with zeros. */
3517
3518 if (!ob->hostlist)
3519 {
3520 uschar *s = ob->hosts;
3521
3522 if (Ustrchr(s, '$') != NULL)
3523 {
3524 if (!(expanded_hosts = expand_string(s)))
3525 {
3526 addrlist->message = string_sprintf("failed to expand list of hosts "
3527 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3528 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3529 return FALSE; /* Only top address has status */
3530 }
3531 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3532 "\"%s\"\n", s, expanded_hosts);
3533 s = expanded_hosts;
3534 }
3535 else
3536 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3537
3538 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3539
3540 /* Check that the expansion yielded something useful. */
3541 if (!hostlist)
3542 {
3543 addrlist->message =
3544 string_sprintf("%s transport has empty hosts setting", tblock->name);
3545 addrlist->transport_return = PANIC;
3546 return FALSE; /* Only top address has status */
3547 }
3548
3549 /* If there was no expansion of hosts, save the host list for
3550 next time. */
3551
3552 if (!expanded_hosts) ob->hostlist = hostlist;
3553 }
3554
3555 /* This is not the first time this transport has been run in this delivery;
3556 the host list was built previously. */
3557
3558 else
3559 hostlist = ob->hostlist;
3560 }
3561
3562 /* The host list was supplied with the address. If hosts_randomize is set, we
3563 must sort it into a random order if it did not come from MX records and has not
3564 already been randomized (but don't bother if continuing down an existing
3565 connection). */
3566
3567 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3568 {
3569 host_item *newlist = NULL;
3570 while (hostlist)
3571 {
3572 host_item *h = hostlist;
3573 hostlist = hostlist->next;
3574
3575 h->sort_key = random_number(100);
3576
3577 if (!newlist)
3578 {
3579 h->next = NULL;
3580 newlist = h;
3581 }
3582 else if (h->sort_key < newlist->sort_key)
3583 {
3584 h->next = newlist;
3585 newlist = h;
3586 }
3587 else
3588 {
3589 host_item *hh = newlist;
3590 while (hh->next)
3591 {
3592 if (h->sort_key < hh->next->sort_key) break;
3593 hh = hh->next;
3594 }
3595 h->next = hh->next;
3596 hh->next = h;
3597 }
3598 }
3599
3600 hostlist = addrlist->host_list = newlist;
3601 }
3602
3603 /* Sort out the default port. */
3604
3605 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3606
3607 /* For each host-plus-IP-address on the list:
3608
3609 . If this is a continued delivery and the host isn't the one with the
3610 current connection, skip.
3611
3612 . If the status is unusable (i.e. previously failed or retry checked), skip.
3613
3614 . If no IP address set, get the address, either by turning the name into
3615 an address, calling gethostbyname if gethostbyname is on, or by calling
3616 the DNS. The DNS may yield multiple addresses, in which case insert the
3617 extra ones into the list.
3618
3619 . Get the retry data if not previously obtained for this address and set the
3620 field which remembers the state of this address. Skip if the retry time is
3621 not reached. If not, remember whether retry data was found. The retry string
3622 contains both the name and the IP address.
3623
3624 . Scan the list of addresses and mark those whose status is DEFER as
3625 PENDING_DEFER. These are the only ones that will be processed in this cycle
3626 of the hosts loop.
3627
3628 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3629 Some addresses may be successfully delivered, others may fail, and yet
3630 others may get temporary errors and so get marked DEFER.
3631
3632 . The return from the delivery attempt is OK if a connection was made and a
3633 valid SMTP dialogue was completed. Otherwise it is DEFER.
3634
3635 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3636
3637 . If fail to connect, or other defer state, add a retry item.
3638
3639 . If there are any addresses whose status is still DEFER, carry on to the
3640 next host/IPaddress, unless we have tried the number of hosts given
3641 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3642 there is some fancy logic for hosts_max_try that means its limit can be
3643 overstepped in some circumstances.
3644
3645 If we get to the end of the list, all hosts have deferred at least one address,
3646 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3647 delivery attempt to those hosts whose last try was before the arrival time of
3648 the current message. To cope with this, we have to go round the loop a second
3649 time. After that, set the status and error data for any addresses that haven't
3650 had it set already. */
3651
3652 for (cutoff_retry = 0;
3653 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3654 cutoff_retry++)
3655 {
3656 host_item *nexthost = NULL;
3657 int unexpired_hosts_tried = 0;
3658
3659 for (host = hostlist;
3660 host
3661 && unexpired_hosts_tried < ob->hosts_max_try
3662 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3663 host = nexthost)
3664 {
3665 int rc;
3666 int host_af;
3667 uschar *rs;
3668 BOOL host_is_expired = FALSE;
3669 BOOL message_defer = FALSE;
3670 BOOL some_deferred = FALSE;
3671 address_item *first_addr = NULL;
3672 uschar *interface = NULL;
3673 uschar *retry_host_key = NULL;
3674 uschar *retry_message_key = NULL;
3675 uschar *serialize_key = NULL;
3676
3677 /* Default next host is next host. :-) But this can vary if the
3678 hosts_max_try limit is hit (see below). It may also be reset if a host
3679 address is looked up here (in case the host was multihomed). */
3680
3681 nexthost = host->next;
3682
3683 /* If the address hasn't yet been obtained from the host name, look it up
3684 now, unless the host is already marked as unusable. If it is marked as
3685 unusable, it means that the router was unable to find its IP address (in
3686 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3687 the lookup failed last time. We don't get this far if *all* MX records
3688 point to non-existent hosts; that is treated as a hard error.
3689
3690 We can just skip this host entirely. When the hosts came from the router,
3691 the address will timeout based on the other host(s); when the address is
3692 looked up below, there is an explicit retry record added.
3693
3694 Note that we mustn't skip unusable hosts if the address is not unset; they
3695 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3696
3697 if (!host->address)
3698 {
3699 int new_port, flags;
3700 host_item *hh;
3701
3702 if (host->status >= hstatus_unusable)
3703 {
3704 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3705 host->name);
3706 continue;
3707 }
3708
3709 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3710
3711 /* The host name is permitted to have an attached port. Find it, and
3712 strip it from the name. Just remember it for now. */
3713
3714 new_port = host_item_get_port(host);
3715
3716 /* Count hosts looked up */
3717
3718 hosts_looked_up++;
3719
3720 /* Find by name if so configured, or if it's an IP address. We don't
3721 just copy the IP address, because we need the test-for-local to happen. */
3722
3723 flags = HOST_FIND_BY_A;
3724 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3725 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3726
3727 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3728 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3729 else
3730 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3731 &ob->dnssec, /* domains for request/require */
3732 NULL, NULL);
3733
3734 /* Update the host (and any additional blocks, resulting from
3735 multihoming) with a host-specific port, if any. */
3736
3737 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3738
3739 /* Failure to find the host at this time (usually DNS temporary failure)
3740 is really a kind of routing failure rather than a transport failure.
3741 Therefore we add a retry item of the routing kind, not to stop us trying
3742 to look this name up here again, but to ensure the address gets timed
3743 out if the failures go on long enough. A complete failure at this point
3744 commonly points to a configuration error, but the best action is still
3745 to carry on for the next host. */
3746
3747 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3748 {
3749 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3750 expired = FALSE;
3751 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3752 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3753 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3754 host->status = hstatus_unusable;
3755
3756 for (addr = addrlist; addr; addr = addr->next)
3757 {
3758 if (addr->transport_return != DEFER) continue;
3759 addr->basic_errno = ERRNO_UNKNOWNHOST;
3760 addr->message =
3761 string_sprintf("failed to lookup IP address for %s", host->name);
3762 }
3763 continue;
3764 }
3765
3766 /* If the host is actually the local host, we may have a problem, or
3767 there may be some cunning configuration going on. In the problem case,
3768 log things and give up. The default transport status is already DEFER. */
3769
3770 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3771 {
3772 for (addr = addrlist; addr; addr = addr->next)
3773 {
3774 addr->basic_errno = 0;
3775 addr->message = string_sprintf("%s transport found host %s to be "
3776 "local", tblock->name, host->name);
3777 }
3778 goto END_TRANSPORT;
3779 }
3780 } /* End of block for IP address lookup */
3781
3782 /* If this is a continued delivery, we are interested only in the host
3783 which matches the name of the existing open channel. The check is put
3784 here after the local host lookup, in case the name gets expanded as a
3785 result of the lookup. Set expired FALSE, to save the outer loop executing
3786 twice. */
3787
3788 if ( continue_hostname
3789 && ( Ustrcmp(continue_hostname, host->name) != 0
3790 || Ustrcmp(continue_host_address, host->address) != 0
3791 ) )
3792 {
3793 expired = FALSE;
3794 continue; /* With next host */
3795 }
3796
3797 /* Reset the default next host in case a multihomed host whose addresses
3798 are not looked up till just above added to the host list. */
3799
3800 nexthost = host->next;
3801
3802 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3803 domain is in queue_smtp_domains, we don't actually want to attempt any
3804 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3805 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3806 were not in it. We don't want to hold up all SMTP deliveries! Except when
3807 doing a two-stage queue run, don't do this if forcing. */
3808
3809 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3810 match_isinlist(addrlist->domain,
3811 (const uschar **)&queue_smtp_domains, 0,
3812 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3813 {
3814 expired = FALSE;
3815 for (addr = addrlist; addr; addr = addr->next)
3816 if (addr->transport_return == DEFER)
3817 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3818 continue; /* With next host */
3819 }
3820
3821 /* Count hosts being considered - purely for an intelligent comment
3822 if none are usable. */
3823
3824 hosts_total++;
3825
3826 /* Set $host and $host address now in case they are needed for the
3827 interface expansion or the serialize_hosts check; they remain set if an
3828 actual delivery happens. */
3829
3830 deliver_host = host->name;
3831 deliver_host_address = host->address;
3832 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3833 : host->dnssec == DS_NO ? US"no"
3834 : US"";
3835
3836 /* Set up a string for adding to the retry key if the port number is not
3837 the standard SMTP port. A host may have its own port setting that overrides
3838 the default. */
3839
3840 pistring = string_sprintf(":%d", host->port == PORT_NONE
3841 ? port : host->port);
3842 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3843
3844 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3845 string is set, even if constant (as different transports can have different
3846 constant settings), we must add it to the key that is used for retries,
3847 because connections to the same host from a different interface should be
3848 treated separately. */
3849
3850 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3851 if ((rs = ob->interface) && *rs)
3852 {
3853 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3854 return FALSE;
3855 pistring = string_sprintf("%s/%s", pistring, interface);
3856 }
3857
3858 /* The first time round the outer loop, check the status of the host by
3859 inspecting the retry data. The second time round, we are interested only
3860 in expired hosts that haven't been tried since this message arrived. */
3861
3862 if (cutoff_retry == 0)
3863 {
3864 BOOL incl_ip;
3865 /* Ensure the status of the address is set by checking retry data if
3866 necessary. There may be host-specific retry data (applicable to all
3867 messages) and also data for retries of a specific message at this host.
3868 If either of these retry records are actually read, the keys used are
3869 returned to save recomputing them later. */
3870
3871 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3872 US"retry_include_ip_address", ob->retry_include_ip_address,
3873 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3874 continue; /* with next host */
3875
3876 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3877 incl_ip, &retry_host_key, &retry_message_key);
3878
3879 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3880 (host->address == NULL)? US"" : host->address, pistring,
3881 (host->status == hstatus_usable)? "usable" :
3882 (host->status == hstatus_unusable)? "unusable" :
3883 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3884
3885 /* Skip this address if not usable at this time, noting if it wasn't
3886 actually expired, both locally and in the address. */
3887
3888 switch (host->status)
3889 {
3890 case hstatus_unusable:
3891 expired = FALSE;
3892 setflag(addrlist, af_retry_skipped);
3893 /* Fall through */
3894
3895 case hstatus_unusable_expired:
3896 switch (host->why)
3897 {
3898 case hwhy_retry: hosts_retry++; break;
3899 case hwhy_failed: hosts_fail++; break;
3900 case hwhy_deferred: hosts_defer++; break;
3901 }
3902
3903 /* If there was a retry message key, implying that previously there
3904 was a message-specific defer, we don't want to update the list of
3905 messages waiting for these hosts. */
3906
3907 if (retry_message_key) update_waiting = FALSE;
3908 continue; /* With the next host or IP address */
3909 }
3910 }
3911
3912 /* Second time round the loop: if the address is set but expired, and
3913 the message is newer than the last try, let it through. */
3914
3915 else
3916 {
3917 if ( !host->address
3918 || host->status != hstatus_unusable_expired
3919 || host->last_try > received_time)
3920 continue;
3921 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3922 host->name, host->address, pistring);
3923 host_is_expired = TRUE;
3924 }
3925
3926 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3927 it remains TRUE only if all hosts are expired and none are actually tried.
3928 */
3929
3930 expired = FALSE;
3931
3932 /* If this host is listed as one to which access must be serialized,
3933 see if another Exim process has a connection to it, and if so, skip
3934 this host. If not, update the database to record our connection to it
3935 and remember this for later deletion. Do not do any of this if we are
3936 sending the message down a pre-existing connection. */
3937
3938 if ( !continue_hostname
3939 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3940 {
3941 serialize_key = string_sprintf("host-serialize-%s", host->name);
3942 if (!enq_start(serialize_key, 1))
3943 {
3944 DEBUG(D_transport)
3945 debug_printf("skipping host %s because another Exim process "
3946 "is connected to it\n", host->name);
3947 hosts_serial++;
3948 continue;
3949 }
3950 }
3951
3952 /* OK, we have an IP address that is not waiting for its retry time to
3953 arrive (it might be expired) OR (second time round the loop) we have an
3954 expired host that hasn't been tried since the message arrived. Have a go
3955 at delivering the message to it. First prepare the addresses by flushing
3956 out the result of previous attempts, and finding the first address that
3957 is still to be delivered. */
3958
3959 first_addr = prepare_addresses(addrlist, host);
3960
3961 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3962 message_id, host->name, host->address, addrlist->address,
3963 addrlist->next ? ", ..." : "");
3964
3965 set_process_info("delivering %s to %s [%s] (%s%s)",
3966 message_id, host->name, host->address, addrlist->address,
3967 addrlist->next ? ", ..." : "");
3968
3969 /* This is not for real; don't do the delivery. If there are
3970 any remaining hosts, list them. */
3971
3972 if (dont_deliver)
3973 {
3974 host_item *host2;
3975 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3976 for (addr = addrlist; addr; addr = addr->next)
3977 {
3978 addr->host_used = host;
3979 addr->special_action = '*';
3980 addr->message = US"delivery bypassed by -N option";
3981 }
3982 DEBUG(D_transport)
3983 {
3984 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3985 "*** host and remaining hosts:\n", tblock->name);
3986 for (host2 = host; host2; host2 = host2->next)
3987 debug_printf(" %s [%s]\n", host2->name,
3988 host2->address ? host2->address : US"unset");
3989 }
3990 rc = OK;
3991 }
3992
3993 /* This is for real. If the host is expired, we don't count it for
3994 hosts_max_retry. This ensures that all hosts must expire before an address
3995 is timed out, unless hosts_max_try_hardlimit (which protects against
3996 lunatic DNS configurations) is reached.
3997
3998 If the host is not expired and we are about to hit the hosts_max_retry
3999 limit, check to see if there is a subsequent hosts with a different MX
4000 value. If so, make that the next host, and don't count this one. This is a
4001 heuristic to make sure that different MXs do get tried. With a normal kind
4002 of retry rule, they would get tried anyway when the earlier hosts were
4003 delayed, but if the domain has a "retry every time" type of rule - as is
4004 often used for the the very large ISPs, that won't happen. */
4005
4006 else
4007 {
4008 host_item * thost;
4009 /* Make a copy of the host if it is local to this invocation
4010 of the transport. */
4011
4012 if (expanded_hosts)
4013 {
4014 thost = store_get(sizeof(host_item));
4015 *thost = *host;
4016 thost->name = string_copy(host->name);
4017 thost->address = string_copy(host->address);
4018 }
4019 else
4020 thost = host;
4021
4022 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4023 {
4024 host_item *h;
4025 DEBUG(D_transport)
4026 debug_printf("hosts_max_try limit reached with this host\n");
4027 for (h = host; h; h = h->next) if (h->mx != host->mx)
4028 {
4029 nexthost = h;
4030 unexpired_hosts_tried--;
4031 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4032 "and will be tried\n");
4033 break;
4034 }
4035 }
4036
4037 /* Attempt the delivery. */
4038
4039 total_hosts_tried++;
4040 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4041 &message_defer, FALSE);
4042
4043 /* Yield is one of:
4044 OK => connection made, each address contains its result;
4045 message_defer is set for message-specific defers (when all
4046 recipients are marked defer)
4047 DEFER => there was a non-message-specific delivery problem;
4048 ERROR => there was a problem setting up the arguments for a filter,
4049 or there was a problem with expanding added headers
4050 */
4051
4052 /* If the result is not OK, there was a non-message-specific problem.
4053 If the result is DEFER, we need to write to the logs saying what happened
4054 for this particular host, except in the case of authentication and TLS
4055 failures, where the log has already been written. If all hosts defer a
4056 general message is written at the end. */
4057
4058 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4059 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4060 write_logs(first_addr, host);
4061
4062 #ifndef DISABLE_EVENT
4063 if (rc == DEFER)
4064 deferred_event_raise(first_addr, host);
4065 #endif
4066
4067 /* If STARTTLS was accepted, but there was a failure in setting up the
4068 TLS session (usually a certificate screwup), and the host is not in
4069 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4070 TLS forcibly turned off. We have to start from scratch with a new SMTP
4071 connection. That's why the retry is done from here, not from within
4072 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4073 session, so the in-clear transmission after those errors, if permitted,
4074 happens inside smtp_deliver().] */
4075
4076 #ifdef SUPPORT_TLS
4077 if ( rc == DEFER
4078 && first_addr->basic_errno == ERRNO_TLSFAILURE
4079 && ob->tls_tempfail_tryclear
4080 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4081 )
4082 {
4083 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4084 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4085 first_addr = prepare_addresses(addrlist, host);
4086 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4087 &message_defer, TRUE);
4088 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4089 write_logs(first_addr, host);
4090 # ifndef DISABLE_EVENT
4091 if (rc == DEFER)
4092 deferred_event_raise(first_addr, host);
4093 # endif
4094 }
4095 #endif /*SUPPORT_TLS*/
4096 }
4097
4098 /* Delivery attempt finished */
4099
4100 rs = rc == OK ? US"OK"
4101 : rc == DEFER ? US"DEFER"
4102 : rc == ERROR ? US"ERROR"
4103 : US"?";
4104
4105 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4106 message_id, host->name, host->address, addrlist->address,
4107 addrlist->next ? " (& others)" : "", rs);
4108
4109 /* Release serialization if set up */
4110
4111 if (serialize_key) enq_end(serialize_key);
4112
4113 /* If the result is DEFER, or if a host retry record is known to exist, we
4114 need to add an item to the retry chain for updating the retry database
4115 at the end of delivery. We only need to add the item to the top address,
4116 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4117 for any other delivery attempts using the same address. (It is copied into
4118 the unusable tree at the outer level, so even if different address blocks
4119 contain the same address, it still won't get tried again.) */
4120
4121 if (rc == DEFER || retry_host_key)
4122 {
4123 int delete_flag = rc != DEFER ? rf_delete : 0;
4124 if (!retry_host_key)
4125 {
4126 BOOL incl_ip;
4127 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4128 US"retry_include_ip_address", ob->retry_include_ip_address,
4129 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4130 incl_ip = TRUE; /* error; use most-specific retry record */
4131
4132 retry_host_key = incl_ip
4133 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4134 : string_sprintf("T:%S%s", host->name, pistring);
4135 }
4136
4137 /* If a delivery of another message over an existing SMTP connection
4138 yields DEFER, we do NOT set up retry data for the host. This covers the
4139 case when there are delays in routing the addresses in the second message
4140 that are so long that the server times out. This is alleviated by not
4141 routing addresses that previously had routing defers when handling an
4142 existing connection, but even so, this case may occur (e.g. if a
4143 previously happily routed address starts giving routing defers). If the
4144 host is genuinely down, another non-continued message delivery will
4145 notice it soon enough. */
4146
4147 if (delete_flag != 0 || !continue_hostname)
4148 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4149
4150 /* We may have tried an expired host, if its retry time has come; ensure
4151 the status reflects the expiry for the benefit of any other addresses. */
4152
4153 if (rc == DEFER)
4154 {
4155 host->status = host_is_expired
4156 ? hstatus_unusable_expired : hstatus_unusable;
4157 host->why = hwhy_deferred;
4158 }
4159 }
4160
4161 /* If message_defer is set (host was OK, but every recipient got deferred
4162 because of some message-specific problem), or if that had happened
4163 previously so that a message retry key exists, add an appropriate item
4164 to the retry chain. Note that if there was a message defer but now there is
4165 a host defer, the message defer record gets deleted. That seems perfectly
4166 reasonable. Also, stop the message from being remembered as waiting
4167 for specific hosts. */
4168
4169 if (message_defer || retry_message_key)
4170 {
4171 int delete_flag = message_defer ? 0 : rf_delete;
4172 if (!retry_message_key)
4173 {
4174 BOOL incl_ip;
4175 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4176 US"retry_include_ip_address", ob->retry_include_ip_address,
4177 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4178 incl_ip = TRUE; /* error; use most-specific retry record */
4179
4180 retry_message_key = incl_ip
4181 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4182 message_id)
4183 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4184 }
4185 retry_add_item(addrlist, retry_message_key,
4186 rf_message | rf_host | delete_flag);
4187 update_waiting = FALSE;
4188 }
4189
4190 /* Any return other than DEFER (that is, OK or ERROR) means that the
4191 addresses have got their final statuses filled in for this host. In the OK
4192 case, see if any of them are deferred. */
4193
4194 if (rc == OK)
4195 for (addr = addrlist; addr; addr = addr->next)
4196 if (addr->transport_return == DEFER)
4197 {
4198 some_deferred = TRUE;
4199 break;
4200 }
4201
4202 /* If no addresses deferred or the result was ERROR, return. We do this for
4203 ERROR because a failing filter set-up or add_headers expansion is likely to
4204 fail for any host we try. */
4205
4206 if (rc == ERROR || (rc == OK && !some_deferred))
4207 {
4208 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4209 return TRUE; /* Each address has its status */
4210 }
4211
4212 /* If the result was DEFER or some individual addresses deferred, let
4213 the loop run to try other hosts with the deferred addresses, except for the
4214 case when we were trying to deliver down an existing channel and failed.
4215 Don't try any other hosts in this case. */
4216
4217 if (continue_hostname) break;
4218
4219 /* If the whole delivery, or some individual addresses, were deferred and
4220 there are more hosts that could be tried, do not count this host towards
4221 the hosts_max_try limit if the age of the message is greater than the
4222 maximum retry time for this host. This means we may try try all hosts,
4223 ignoring the limit, when messages have been around for some time. This is
4224 important because if we don't try all hosts, the address will never time
4225 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4226
4227 if ((rc == DEFER || some_deferred) && nexthost)
4228 {
4229 BOOL timedout;
4230 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4231
4232 if (retry && retry->rules)
4233 {
4234 retry_rule *last_rule;
4235 for (last_rule = retry->rules;
4236 last_rule->next;
4237 last_rule = last_rule->next);
4238 timedout = time(NULL) - received_time > last_rule->timeout;
4239 }
4240 else timedout = TRUE; /* No rule => timed out */
4241
4242 if (timedout)
4243 {
4244 unexpired_hosts_tried--;
4245 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4246 "hosts_max_try (message older than host's retry time)\n");
4247 }
4248 }
4249 } /* End of loop for trying multiple hosts. */
4250
4251 /* This is the end of the loop that repeats iff expired is TRUE and
4252 ob->delay_after_cutoff is FALSE. The second time round we will
4253 try those hosts that haven't been tried since the message arrived. */
4254
4255 DEBUG(D_transport)
4256 {
4257 debug_printf("all IP addresses skipped or deferred at least one address\n");
4258 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4259 debug_printf("retrying IP addresses not tried since message arrived\n");
4260 }
4261 }
4262
4263
4264 /* Get here if all IP addresses are skipped or defer at least one address. In
4265 MUA wrapper mode, this will happen only for connection or other non-message-
4266 specific failures. Force the delivery status for all addresses to FAIL. */
4267
4268 if (mua_wrapper)
4269 {
4270 for (addr = addrlist; addr; addr = addr->next)
4271 addr->transport_return = FAIL;
4272 goto END_TRANSPORT;
4273 }
4274
4275 /* In the normal, non-wrapper case, add a standard message to each deferred
4276 address if there hasn't been an error, that is, if it hasn't actually been
4277 tried this time. The variable "expired" will be FALSE if any deliveries were
4278 actually tried, or if there was at least one host that was not expired. That
4279 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4280 a delivery has been tried, an error code will be set, and the failing of the
4281 message is handled by the retry code later.
4282
4283 If queue_smtp is set, or this transport was called to send a subsequent message
4284 down an existing TCP/IP connection, and something caused the host not to be
4285 found, we end up here, but can detect these cases and handle them specially. */
4286
4287 for (addr = addrlist; addr; addr = addr->next)
4288 {
4289 /* If host is not NULL, it means that we stopped processing the host list
4290 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4291 means we need to behave as if some hosts were skipped because their retry
4292 time had not come. Specifically, this prevents the address from timing out.
4293 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4294 hosts were tried. */
4295
4296 if (host)
4297 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4298 {
4299 DEBUG(D_transport)
4300 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4301 "hosts were tried\n");
4302 }
4303 else
4304 {
4305 DEBUG(D_transport)
4306 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4307 setflag(addr, af_retry_skipped);
4308 }
4309
4310 if (queue_smtp) /* no deliveries attempted */
4311 {
4312 addr->transport_return = DEFER;
4313 addr->basic_errno = 0;
4314 addr->message = US"SMTP delivery explicitly queued";
4315 }
4316
4317 else if ( addr->transport_return == DEFER
4318 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4319 && !addr->message
4320 )
4321 {
4322 addr->basic_errno = ERRNO_HRETRY;
4323 if (continue_hostname)
4324 addr->message = US"no host found for existing SMTP connection";
4325 else if (expired)
4326 {
4327 setflag(addr, af_pass_message); /* This is not a security risk */
4328 addr->message = string_sprintf(
4329 "all hosts%s have been failing for a long time %s",
4330 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4331 ob->delay_after_cutoff
4332 ? US"(and retry time not reached)"
4333 : US"and were last tried after this message arrived");
4334
4335 /* If we are already using fallback hosts, or there are no fallback hosts
4336 defined, convert the result to FAIL to cause a bounce. */
4337
4338 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4339 addr->transport_return = FAIL;
4340 }
4341 else
4342 {
4343 const char * s;
4344 if (hosts_retry == hosts_total)
4345 s = "retry time not reached for any host%s";
4346 else if (hosts_fail == hosts_total)
4347 s = "all host address lookups%s failed permanently";
4348 else if (hosts_defer == hosts_total)
4349 s = "all host address lookups%s failed temporarily";
4350 else if (hosts_serial == hosts_total)
4351 s = "connection limit reached for all hosts%s";
4352 else if (hosts_fail+hosts_defer == hosts_total)
4353 s = "all host address lookups%s failed";
4354 else
4355 s = "some host address lookups failed and retry time "
4356 "not reached for other hosts or connection limit reached%s";
4357
4358 addr->message = string_sprintf(s,
4359 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4360 }
4361 }
4362 }
4363
4364 /* Update the database which keeps information about which messages are waiting
4365 for which hosts to become available. For some message-specific errors, the
4366 update_waiting flag is turned off because we don't want follow-on deliveries in
4367 those cases. If this transport instance is explicitly limited to one message
4368 per connection then follow-on deliveries are not possible and there's no need
4369 to create/update the per-transport wait-<transport_name> database. */
4370
4371 if (update_waiting && tblock->connection_max_messages != 1)
4372 transport_update_waiting(hostlist, tblock->name);
4373
4374 END_TRANSPORT:
4375
4376 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4377
4378 return TRUE; /* Each address has its status */
4379 }
4380
4381 /* vi: aw ai sw=2
4382 */
4383 /* End of transport/smtp.c */
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