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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 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 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
743 address_retry_
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
753
754 Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
761 */
762
763 static int
764 sync_responses(address_item *addrlist, BOOL include_affixes,
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
768 int buffsize)
769 {
770 address_item *addr = *sync_addr;
771 int yield = 0;
772
773 /* Handle the response for a MAIL command. On error, reinstate the original
774 command in big_buffer for error message use, and flush any further pending
775 responses before returning, except after I/O errors and timeouts. */
776
777 if (pending_MAIL)
778 {
779 count--;
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
781 {
782 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
785 {
786 uschar flushbuffer[4096];
787 int save_errno = 0;
788 if (buffer[0] == '4')
789 {
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
792 }
793 while (count-- > 0)
794 {
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
796 '2', timeout)
797 && (errno != 0 || flushbuffer[0] == 0))
798 break;
799 }
800 errno = save_errno;
801 }
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
805 {
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
808 addr = addr->next;
809 }
810 return -3;
811 }
812 }
813
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
815
816 /* Read and handle the required number of RCPT responses, matching each one up
817 with an address by scanning for the next address whose status is PENDING_DEFER.
818 */
819
820 while (count-- > 0)
821 {
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
823
824 /* The address was accepted */
825 addr->host_used = host;
826
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
828 {
829 yield |= 1;
830 addr->transport_return = PENDING_OK;
831
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
835
836 if (testflag(addr, af_dr_retry_exists))
837 {
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
839 sender_address);
840 retry_add_item(addr, altkey, rf_delete);
841 retry_add_item(addr, addr->address_retry_key, rf_delete);
842 }
843 }
844
845 /* Timeout while reading the response */
846
847 else if (errno == ETIMEDOUT)
848 {
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
852 retry_add_item(addr, addr->address_retry_key, 0);
853 update_waiting = FALSE;
854 return -1;
855 }
856
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
860 makes sense. */
861
862 else if (errno != 0 || buffer[0] == 0)
863 {
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
866 return -2;
867 }
868
869 /* Handle SMTP permanent and temporary response codes. */
870
871 else
872 {
873 addr->message =
874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
877 setflag(addr, af_pass_message);
878 msglog_line(host, addr->message);
879
880 /* The response was 5xx */
881
882 if (buffer[0] == '5')
883 {
884 addr->transport_return = FAIL;
885 yield |= 2;
886 }
887
888 /* The response was 4xx */
889
890 else
891 {
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
895
896 #ifndef DISABLE_EVENT
897 event_defer_errno = addr->more_errno;
898 msg_event_raise(US"msg:rcpt:host:defer", addr);
899 #endif
900
901 /* Log temporary errors if there are more hosts to be tried.
902 If not, log this last one in the == line. */
903
904 if (host->next)
905 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
906
907 #ifndef DISABLE_EVENT
908 else
909 msg_event_raise(US"msg:rcpt:defer", addr);
910 #endif
911
912 /* Do not put this message on the list of those waiting for specific
913 hosts, as otherwise it is likely to be tried too often. */
914
915 update_waiting = FALSE;
916
917 /* Add a retry item for the address so that it doesn't get tried again
918 too soon. If address_retry_include_sender is true, add the sender address
919 to the retry key. */
920
921 if (address_retry_include_sender)
922 {
923 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
924 sender_address);
925 retry_add_item(addr, altkey, 0);
926 }
927 else retry_add_item(addr, addr->address_retry_key, 0);
928 }
929 }
930 } /* Loop for next RCPT response */
931
932 /* Update where to start at for the next block of responses, unless we
933 have already handled all the addresses. */
934
935 if (addr != NULL) *sync_addr = addr->next;
936
937 /* Handle a response to DATA. If we have not had any good recipients, either
938 previously or in this block, the response is ignored. */
939
940 if (pending_DATA != 0 &&
941 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
942 {
943 int code;
944 uschar *msg;
945 BOOL pass_message;
946 if (pending_DATA > 0 || (yield & 1) != 0)
947 {
948 if (errno == 0 && buffer[0] == '4')
949 {
950 errno = ERRNO_DATA4XX;
951 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
952 }
953 return -3;
954 }
955 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
956 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
957 "is in use and there were no good recipients\n", msg);
958 }
959
960 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
961 present) received 3xx. If any RCPTs were handled and yielded anything other
962 than 4xx, yield will be set non-zero. */
963
964 return yield;
965 }
966
967
968
969 /* Do the client side of smtp-level authentication */
970 /*
971 Arguments:
972 buffer EHLO response from server (gets overwritten)
973 addrlist chain of potential addresses to deliver
974 host host to deliver to
975 ob transport options
976 ibp, obp comms channel control blocks
977
978 Returns:
979 OK Success, or failed (but not required): global "smtp_authenticated" set
980 DEFER Failed authentication (and was required)
981 ERROR Internal problem
982
983 FAIL_SEND Failed communications - transmit
984 FAIL - response
985 */
986
987 int
988 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
989 smtp_transport_options_block *ob, BOOL is_esmtp,
990 smtp_inblock *ibp, smtp_outblock *obp)
991 {
992 int require_auth;
993 uschar *fail_reason = US"server did not advertise AUTH support";
994
995 smtp_authenticated = FALSE;
996 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
997 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
998
999 if (is_esmtp && !regex_AUTH) regex_AUTH =
1000 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1001 FALSE, TRUE);
1002
1003 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1004 {
1005 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1006 expand_nmax = -1; /* reset */
1007
1008 /* Must not do this check until after we have saved the result of the
1009 regex match above. */
1010
1011 if (require_auth == OK ||
1012 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1013 {
1014 auth_instance *au;
1015 fail_reason = US"no common mechanisms were found";
1016
1017 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1018
1019 /* Scan the configured authenticators looking for one which is configured
1020 for use as a client, which is not suppressed by client_condition, and
1021 whose name matches an authentication mechanism supported by the server.
1022 If one is found, attempt to authenticate by calling its client function.
1023 */
1024
1025 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1026 {
1027 uschar *p = names;
1028 if (!au->client ||
1029 (au->client_condition != NULL &&
1030 !expand_check_condition(au->client_condition, au->name,
1031 US"client authenticator")))
1032 {
1033 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1034 au->name,
1035 (au->client)? "client_condition is false" :
1036 "not configured as a client");
1037 continue;
1038 }
1039
1040 /* Loop to scan supported server mechanisms */
1041
1042 while (*p != 0)
1043 {
1044 int rc;
1045 int len = Ustrlen(au->public_name);
1046 while (isspace(*p)) p++;
1047
1048 if (strncmpic(au->public_name, p, len) != 0 ||
1049 (p[len] != 0 && !isspace(p[len])))
1050 {
1051 while (*p != 0 && !isspace(*p)) p++;
1052 continue;
1053 }
1054
1055 /* Found data for a listed mechanism. Call its client entry. Set
1056 a flag in the outblock so that data is overwritten after sending so
1057 that reflections don't show it. */
1058
1059 fail_reason = US"authentication attempt(s) failed";
1060 obp->authenticating = TRUE;
1061 rc = (au->info->clientcode)(au, ibp, obp,
1062 ob->command_timeout, buffer, bufsize);
1063 obp->authenticating = FALSE;
1064 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1065 au->name, rc);
1066
1067 /* A temporary authentication failure must hold up delivery to
1068 this host. After a permanent authentication failure, we carry on
1069 to try other authentication methods. If all fail hard, try to
1070 deliver the message unauthenticated unless require_auth was set. */
1071
1072 switch(rc)
1073 {
1074 case OK:
1075 smtp_authenticated = TRUE; /* stops the outer loop */
1076 client_authenticator = au->name;
1077 if (au->set_client_id != NULL)
1078 client_authenticated_id = expand_string(au->set_client_id);
1079 break;
1080
1081 /* Failure after writing a command */
1082
1083 case FAIL_SEND:
1084 return FAIL_SEND;
1085
1086 /* Failure after reading a response */
1087
1088 case FAIL:
1089 if (errno != 0 || buffer[0] != '5') return FAIL;
1090 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1091 au->name, host->name, host->address, buffer);
1092 break;
1093
1094 /* Failure by some other means. In effect, the authenticator
1095 decided it wasn't prepared to handle this case. Typically this
1096 is the result of "fail" in an expansion string. Do we need to
1097 log anything here? Feb 2006: a message is now put in the buffer
1098 if logging is required. */
1099
1100 case CANCELLED:
1101 if (*buffer != 0)
1102 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1103 "authentication H=%s [%s] %s", au->name, host->name,
1104 host->address, buffer);
1105 break;
1106
1107 /* Internal problem, message in buffer. */
1108
1109 case ERROR:
1110 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1111 DEFER, FALSE);
1112 return ERROR;
1113 }
1114
1115 break; /* If not authenticated, try next authenticator */
1116 } /* Loop for scanning supported server mechanisms */
1117 } /* Loop for further authenticators */
1118 }
1119 }
1120
1121 /* If we haven't authenticated, but are required to, give up. */
1122
1123 if (require_auth == OK && !smtp_authenticated)
1124 {
1125 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1126 string_sprintf("authentication required but %s", fail_reason), DEFER,
1127 FALSE);
1128 return DEFER;
1129 }
1130
1131 return OK;
1132 }
1133
1134
1135 /* Construct AUTH appendix string for MAIL TO */
1136 /*
1137 Arguments
1138 buffer to build string
1139 addrlist chain of potential addresses to deliver
1140 ob transport options
1141
1142 Globals smtp_authenticated
1143 client_authenticated_sender
1144 Return True on error, otherwise buffer has (possibly empty) terminated string
1145 */
1146
1147 BOOL
1148 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1149 smtp_transport_options_block *ob)
1150 {
1151 uschar *local_authenticated_sender = authenticated_sender;
1152
1153 #ifdef notdef
1154 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1155 #endif
1156
1157 if (ob->authenticated_sender != NULL)
1158 {
1159 uschar *new = expand_string(ob->authenticated_sender);
1160 if (new == NULL)
1161 {
1162 if (!expand_string_forcedfail)
1163 {
1164 uschar *message = string_sprintf("failed to expand "
1165 "authenticated_sender: %s", expand_string_message);
1166 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1167 return TRUE;
1168 }
1169 }
1170 else if (new[0] != 0) local_authenticated_sender = new;
1171 }
1172
1173 /* Add the authenticated sender address if present */
1174
1175 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1176 local_authenticated_sender != NULL)
1177 {
1178 string_format(buffer, bufsize, " AUTH=%s",
1179 auth_xtextencode(local_authenticated_sender,
1180 Ustrlen(local_authenticated_sender)));
1181 client_authenticated_sender = string_copy(local_authenticated_sender);
1182 }
1183 else
1184 *buffer= 0;
1185
1186 return FALSE;
1187 }
1188
1189
1190
1191 #ifdef EXPERIMENTAL_DANE
1192 /* Lookup TLSA record for host/port.
1193 Return: OK success with dnssec; DANE mode
1194 DEFER Do not use this host now, may retry later
1195 FAIL_FORCED No TLSA record; DANE not usable
1196 FAIL Do not use this connection
1197 */
1198
1199 int
1200 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1201 {
1202 /* move this out to host.c given the similarity to dns_lookup() ? */
1203 uschar buffer[300];
1204 const uschar * fullname = buffer;
1205
1206 /* TLSA lookup string */
1207 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1208
1209 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1210 {
1211 case DNS_SUCCEED:
1212 if (!dns_is_secure(dnsa))
1213 {
1214 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1215 return DEFER;
1216 }
1217 return OK;
1218
1219 case DNS_AGAIN:
1220 return DEFER; /* just defer this TLS'd conn */
1221
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
1224 return dane_required ? FAIL : FAIL_FORCED;
1225
1226 default:
1227 case DNS_FAIL:
1228 return dane_required ? FAIL : DEFER;
1229 }
1230 }
1231 #endif
1232
1233
1234
1235 typedef struct smtp_compare_s
1236 {
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1239 } smtp_compare_t;
1240
1241
1242 /* Create a unique string that identifies this message, it is based on
1243 sender_address, helo_data and tls_certificate if enabled.
1244 */
1245
1246 static uschar *
1247 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1248 {
1249 address_item * addr1;
1250 uschar * if1 = US"";
1251 uschar * helo1 = US"";
1252 #ifdef SUPPORT_TLS
1253 uschar * tlsc1 = US"";
1254 #endif
1255 uschar * save_sender_address = sender_address;
1256 uschar * local_identity = NULL;
1257 smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1259
1260 sender_address = sender;
1261
1262 addr1 = deliver_make_addr (sender, TRUE);
1263 deliver_set_expansions(addr1);
1264
1265 if (ob->interface)
1266 if1 = expand_string(ob->interface);
1267
1268 if (ob->helo_data)
1269 helo1 = expand_string(ob->helo_data);
1270
1271 #ifdef SUPPORT_TLS
1272 if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1275 #else
1276 local_identity = string_sprintf ("%s^%s", if1, helo1);
1277 #endif
1278
1279 deliver_set_expansions(NULL);
1280 sender_address = save_sender_address;
1281
1282 return local_identity;
1283 }
1284
1285
1286
1287 /* This routine is a callback that is called from transport_check_waiting.
1288 This function will evaluate the incoming message versus the previous
1289 message. If the incoming message is using a different local identity then
1290 we will veto this new message. */
1291
1292 static BOOL
1293 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1294 {
1295 uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1298
1299 current_local_identity =
1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1301
1302 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1303 return 0;
1304
1305 message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
1307
1308 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1309 }
1310
1311
1312
1313 uschar
1314 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1315 {
1316 #ifdef SUPPORT_TLS
1317 if ( checks & PEER_OFFERED_TLS
1318 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_TLS;
1320 #endif
1321
1322 if ( checks & PEER_OFFERED_IGNQ
1323 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1324 PCRE_EOPT, NULL, 0) < 0)
1325 checks &= ~PEER_OFFERED_IGNQ;
1326
1327 if ( checks & PEER_OFFERED_CHUNKING
1328 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_CHUNKING;
1330
1331 #ifndef DISABLE_PRDR
1332 if ( checks & PEER_OFFERED_PRDR
1333 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PRDR;
1335 #endif
1336
1337 #ifdef SUPPORT_I18N
1338 if ( checks & PEER_OFFERED_UTF8
1339 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_UTF8;
1341 #endif
1342
1343 if ( checks & PEER_OFFERED_DSN
1344 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_DSN;
1346
1347 if ( checks & PEER_OFFERED_PIPE
1348 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1349 PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_PIPE;
1351
1352 if ( checks & PEER_OFFERED_SIZE
1353 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_SIZE;
1355
1356 return checks;
1357 }
1358
1359
1360
1361 /* Callback for emitting a BDAT data chunk header.
1362
1363 If given a nonzero size, first flush any buffered SMTP commands
1364 then emit the command.
1365
1366 Reap previous SMTP command responses if requested.
1367 Reap one SMTP command response if requested.
1368
1369 Returns: OK or ERROR
1370 */
1371
1372 static int
1373 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1374 unsigned chunk_size, unsigned flags)
1375 {
1376 smtp_transport_options_block * ob =
1377 (smtp_transport_options_block *)(tctx->tblock->options_block);
1378 int cmd_count = 0;
1379 int prev_cmd_count;
1380 uschar * buffer = tctx->buffer;
1381
1382
1383 /* Write SMTP chunk header command */
1384
1385 if (chunk_size > 0)
1386 {
1387 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1388 chunk_size,
1389 flags & tc_chunk_last ? " LAST" : "")
1390 ) < 0) return ERROR;
1391 if (flags & tc_chunk_last)
1392 data_command = string_copy(big_buffer); /* Save for later error message */
1393 }
1394
1395 prev_cmd_count = cmd_count += tctx->cmd_count;
1396
1397 /* Reap responses for any previous, but not one we just emitted */
1398
1399 if (chunk_size > 0)
1400 prev_cmd_count--;
1401 if (tctx->pending_BDAT)
1402 prev_cmd_count--;
1403
1404 if (flags & tc_reap_prev && prev_cmd_count > 0)
1405 {
1406 DEBUG(D_transport) debug_printf("look for %d responses"
1407 " for previous pipelined cmds\n", prev_cmd_count);
1408
1409 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1410 tctx->sync_addr, tctx->host, prev_cmd_count,
1411 ob->address_retry_include_sender,
1412 tctx->pending_MAIL, 0,
1413 tctx->inblock,
1414 ob->command_timeout,
1415 buffer, DELIVER_BUFFER_SIZE))
1416 {
1417 case 1: /* 2xx (only) => OK */
1418 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1419 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1420 case 0: break; /* No 2xx or 5xx, but no probs */
1421
1422 case -1: /* Timeout on RCPT */
1423 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1424 }
1425 cmd_count = 1;
1426 if (!tctx->pending_BDAT)
1427 pipelining_active = FALSE;
1428 }
1429
1430 /* Reap response for an outstanding BDAT */
1431
1432 if (tctx->pending_BDAT)
1433 {
1434 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1435
1436 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1437 ob->command_timeout))
1438 {
1439 if (errno == 0 && buffer[0] == '4')
1440 {
1441 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1442 tctx->first_addr->more_errno |=
1443 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1444 }
1445 return ERROR;
1446 }
1447 cmd_count--;
1448 tctx->pending_BDAT = FALSE;
1449 pipelining_active = FALSE;
1450 }
1451 else if (chunk_size > 0)
1452 tctx->pending_BDAT = TRUE;
1453
1454
1455 tctx->cmd_count = cmd_count;
1456 return OK;
1457 }
1458
1459
1460
1461 /*************************************************
1462 * Make connection for given message *
1463 *************************************************/
1464
1465 /*
1466 Arguments:
1467 ctx connection context
1468 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1469 a second attempt after TLS initialization fails
1470 verify TRUE if connection is for a verify callout, FALSE for
1471 a delivery attempt
1472
1473 Returns: OK - the connection was made and the delivery attempted;
1474 fd is set in the conn context, tls_out set up.
1475 DEFER - the connection could not be made, or something failed
1476 while setting up the SMTP session, or there was a
1477 non-message-specific error, such as a timeout.
1478 ERROR - helo_data or add_headers or authenticated_sender is
1479 specified for this transport, and the string failed
1480 to expand
1481 */
1482 int
1483 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls, BOOL verify)
1484 {
1485 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1486 dns_answer tlsa_dnsa;
1487 #endif
1488 BOOL pass_message = FALSE;
1489
1490 uschar * message = NULL;
1491 int save_errno;
1492 int yield = OK;
1493 int rc;
1494
1495 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1496
1497 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1498 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1499 sx->ok = FALSE;
1500 sx->send_rset = TRUE;
1501 sx->send_quit = TRUE;
1502 sx->setting_up = TRUE;
1503 sx->esmtp = TRUE;
1504 sx->esmtp_sent = FALSE;
1505 #ifdef SUPPORT_I18N
1506 sx->utf8_needed = FALSE;
1507 #endif
1508 sx->dsn_all_lasthop = TRUE;
1509 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1510 sx->dane = FALSE;
1511 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1512 #endif
1513
1514 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1515 sx->peer_offered = 0;
1516 sx->igquotstr = US"";
1517 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1518 #ifdef EXPERIMENTAL_DSN_INFO
1519 sx->smtp_greeting = NULL;
1520 sx->helo_response = NULL;
1521 #endif
1522
1523 smtp_command = US"initial connection";
1524 sx->buffer[0] = '\0';
1525
1526 /* Set up the buffer for reading SMTP response packets. */
1527
1528 sx->inblock.buffer = sx->inbuffer;
1529 sx->inblock.buffersize = sizeof(sx->inbuffer);
1530 sx->inblock.ptr = sx->inbuffer;
1531 sx->inblock.ptrend = sx->inbuffer;
1532
1533 /* Set up the buffer for holding SMTP commands while pipelining */
1534
1535 sx->outblock.buffer = sx->outbuffer;
1536 sx->outblock.buffersize = sizeof(sx->outbuffer);
1537 sx->outblock.ptr = sx->outbuffer;
1538 sx->outblock.cmd_count = 0;
1539 sx->outblock.authenticating = FALSE;
1540
1541 /* Reset the parameters of a TLS session. */
1542
1543 tls_out.bits = 0;
1544 tls_out.cipher = NULL; /* the one we may use for this transport */
1545 tls_out.ourcert = NULL;
1546 tls_out.peercert = NULL;
1547 tls_out.peerdn = NULL;
1548 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1549 tls_out.sni = NULL;
1550 #endif
1551 tls_out.ocsp = OCSP_NOT_REQ;
1552
1553 /* Flip the legacy TLS-related variables over to the outbound set in case
1554 they're used in the context of the transport. Don't bother resetting
1555 afterward (when being used by a transport) as we're in a subprocess.
1556 For verify, unflipped once the callout is dealt with */
1557
1558 tls_modify_variables(&tls_out);
1559
1560 #ifndef SUPPORT_TLS
1561 if (sx->smtps)
1562 {
1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1564 DEFER, FALSE);
1565 return ERROR;
1566 }
1567 #endif
1568
1569 /* Make a connection to the host if this isn't a continued delivery, and handle
1570 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571 specially so they can be identified for retries. */
1572
1573 if (continue_hostname == NULL)
1574 {
1575 if (verify)
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1577
1578 /* This puts port into host->port */
1579 sx->inblock.sock = sx->outblock.sock =
1580 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1581 sx->ob->connect_timeout, sx->tblock);
1582
1583 if (sx->inblock.sock < 0)
1584 {
1585 uschar * msg = NULL;
1586 int save_errno = errno;
1587 if (verify)
1588 {
1589 msg = strerror(errno);
1590 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1591 }
1592 set_errno_nohost(sx->addrlist,
1593 save_errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : save_errno,
1594 verify ? string_sprintf("could not connect: %s", msg)
1595 : NULL,
1596 DEFER, FALSE);
1597 sx->send_quit = FALSE;
1598 return DEFER;
1599 }
1600
1601 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1602 {
1603 tls_out.dane_verified = FALSE;
1604 tls_out.tlsa_usage = 0;
1605
1606 if (sx->host->dnssec == DS_YES)
1607 {
1608 if( sx->dane_required
1609 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1610 )
1611 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1612 {
1613 case OK: sx->dane = TRUE; break;
1614 case FAIL_FORCED: break;
1615 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1616 string_sprintf("DANE error: tlsa lookup %s",
1617 rc == DEFER ? "DEFER" : "FAIL"),
1618 rc, FALSE);
1619 return rc;
1620 }
1621 }
1622 else if (sx->dane_required)
1623 {
1624 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1625 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1626 FAIL, FALSE);
1627 return FAIL;
1628 }
1629
1630 if (sx->dane)
1631 sx->ob->tls_tempfail_tryclear = FALSE;
1632 }
1633 #endif /*DANE*/
1634
1635 /* Expand the greeting message while waiting for the initial response. (Makes
1636 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1637 delayed till here so that $sending_interface and $sending_port are set. */
1638
1639 if (sx->helo_data)
1640 if (!(sx->helo_data = expand_string(sx->helo_data)))
1641 if (verify)
1642 log_write(0, LOG_MAIN|LOG_PANIC,
1643 "<%s>: failed to expand transport's helo_data value for callout: %s",
1644 sx->addrlist->address, expand_string_message);
1645
1646 #ifdef SUPPORT_I18N
1647 if (sx->helo_data)
1648 {
1649 expand_string_message = NULL;
1650 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1651 &expand_string_message)),
1652 expand_string_message)
1653 if (verify)
1654 log_write(0, LOG_MAIN|LOG_PANIC,
1655 "<%s>: failed to expand transport's helo_data value for callout: %s",
1656 sx->addrlist->address, expand_string_message);
1657 else
1658 sx->helo_data = NULL;
1659 }
1660 #endif
1661
1662 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1663 is nevertheless a reasonably clean way of programming this kind of logic,
1664 where you want to escape on any error. */
1665
1666 if (!sx->smtps)
1667 {
1668 BOOL good_response;
1669
1670 #ifdef TCP_QUICKACK
1671 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1672 #endif
1673 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1674 '2', sx->ob->command_timeout);
1675 #ifdef EXPERIMENTAL_DSN_INFO
1676 sx->smtp_greeting = string_copy(sx->buffer);
1677 #endif
1678 if (!good_response) goto RESPONSE_FAILED;
1679
1680 #ifndef DISABLE_EVENT
1681 {
1682 uschar * s;
1683 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1684 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1685 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1686 if (s)
1687 {
1688 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1689 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1690 DEFER, FALSE);
1691 yield = DEFER;
1692 goto SEND_QUIT;
1693 }
1694 }
1695 #endif
1696
1697 /* Now check if the helo_data expansion went well, and sign off cleanly if
1698 it didn't. */
1699
1700 if (!sx->helo_data)
1701 {
1702 message = string_sprintf("failed to expand helo_data: %s",
1703 expand_string_message);
1704 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1705 yield = DEFER;
1706 goto SEND_QUIT;
1707 }
1708 }
1709
1710 /** Debugging without sending a message
1711 sx->addrlist->transport_return = DEFER;
1712 goto SEND_QUIT;
1713 **/
1714
1715 /* Errors that occur after this point follow an SMTP command, which is
1716 left in big_buffer by smtp_write_command() for use in error messages. */
1717
1718 smtp_command = big_buffer;
1719
1720 /* Tell the remote who we are...
1721
1722 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1723 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1724 greeting is of this form. The assumption was that the far end supports it
1725 properly... but experience shows that there are some that give 5xx responses,
1726 even though the banner includes "ESMTP" (there's a bloody-minded one that
1727 says "ESMTP not spoken here"). Cope with that case.
1728
1729 September 2000: Time has passed, and it seems reasonable now to always send
1730 EHLO at the start. It is also convenient to make the change while installing
1731 the TLS stuff.
1732
1733 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1734 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1735 would be no way to send out the mails, so there is now a host list
1736 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1737 PIPELINING problem as well. Maybe it can also be useful to cure other
1738 problems with broken servers.
1739
1740 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1741 Then somebody tried it with a Microsoft mailer... It seems that all other
1742 mailers use upper case for some reason (the RFC is quite clear about case
1743 independence) so, for peace of mind, I gave in. */
1744
1745 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1746
1747 /* Alas; be careful, since this goto is not an error-out, so conceivably
1748 we might set data between here and the target which we assume to exist
1749 and be usable. I can see this coming back to bite us. */
1750 #ifdef SUPPORT_TLS
1751 if (sx->smtps)
1752 {
1753 smtp_peer_options |= PEER_OFFERED_TLS;
1754 suppress_tls = FALSE;
1755 sx->ob->tls_tempfail_tryclear = FALSE;
1756 smtp_command = US"SSL-on-connect";
1757 goto TLS_NEGOTIATE;
1758 }
1759 #endif
1760
1761 if (sx->esmtp)
1762 {
1763 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1764 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1765 goto SEND_FAILED;
1766 sx->esmtp_sent = TRUE;
1767 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1768 sx->ob->command_timeout))
1769 {
1770 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1771 {
1772 #ifdef EXPERIMENTAL_DSN_INFO
1773 sx->helo_response = string_copy(sx->buffer);
1774 #endif
1775 goto RESPONSE_FAILED;
1776 }
1777 sx->esmtp = FALSE;
1778 }
1779 #ifdef EXPERIMENTAL_DSN_INFO
1780 sx->helo_response = string_copy(sx->buffer);
1781 #endif
1782 }
1783 else
1784 DEBUG(D_transport)
1785 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1786
1787 if (!sx->esmtp)
1788 {
1789 BOOL good_response;
1790 int n = sizeof(sx->buffer);
1791 uschar * rsp = sx->buffer;
1792
1793 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1794 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1795
1796 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1797 goto SEND_FAILED;
1798 good_response = smtp_read_response(&sx->inblock, rsp, n,
1799 '2', sx->ob->command_timeout);
1800 #ifdef EXPERIMENTAL_DSN_INFO
1801 sx->helo_response = string_copy(rsp);
1802 #endif
1803 if (!good_response)
1804 {
1805 /* Handle special logging for a closed connection after HELO
1806 when had previously sent EHLO */
1807
1808 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1809 {
1810 sx->send_quit = FALSE;
1811 save_errno = ERRNO_SMTPCLOSED;
1812 message = string_sprintf("Remote host closed connection "
1813 "in response to %s (EHLO response was: %s)",
1814 smtp_command, sx->buffer);
1815 goto FAILED;
1816 }
1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1818 goto RESPONSE_FAILED;
1819 }
1820 }
1821
1822 sx->peer_offered = smtp_peer_options = 0;
1823
1824 if (sx->esmtp || sx->lmtp)
1825 {
1826 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
1827 PEER_OFFERED_TLS /* others checked later */
1828 );
1829
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1831
1832 #ifdef SUPPORT_TLS
1833 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1834 #endif
1835 }
1836 }
1837
1838 /* For continuing deliveries down the same channel, the socket is the standard
1839 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1840 below). Set up the pointer to where subsequent commands will be left, for
1841 error messages. Note that smtp_peer_options will have been
1842 set from the command line if they were set in the process that passed the
1843 connection on. */
1844
1845 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1846 as the continue goes via transport_pass_socket() and doublefork and exec.
1847 It does not wait. Unclear how we keep separate host's responses
1848 separate - we could match up by host ip+port as a bodge. */
1849
1850 else
1851 {
1852 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1853 smtp_command = big_buffer;
1854 sx->host->port = sx->port; /* Record the port that was used */
1855 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1856 }
1857
1858 /* If TLS is available on this connection, whether continued or not, attempt to
1859 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1860 send another EHLO - the server may give a different answer in secure mode. We
1861 use a separate buffer for reading the response to STARTTLS so that if it is
1862 negative, the original EHLO data is available for subsequent analysis, should
1863 the client not be required to use TLS. If the response is bad, copy the buffer
1864 for error analysis. */
1865
1866 #ifdef SUPPORT_TLS
1867 if ( smtp_peer_options & PEER_OFFERED_TLS
1868 && !suppress_tls
1869 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1870 && ( !verify
1871 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1872 ) )
1873 {
1874 uschar buffer2[4096];
1875 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1876 goto SEND_FAILED;
1877
1878 /* If there is an I/O error, transmission of this message is deferred. If
1879 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1880 false, we also defer. However, if there is a temporary rejection of STARTTLS
1881 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1882 STARTTLS, we carry on. This means we will try to send the message in clear,
1883 unless the host is in hosts_require_tls (tested below). */
1884
1885 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1886 sx->ob->command_timeout))
1887 {
1888 if ( errno != 0
1889 || buffer2[0] == 0
1890 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1891 )
1892 {
1893 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1894 goto RESPONSE_FAILED;
1895 }
1896 }
1897
1898 /* STARTTLS accepted: try to negotiate a TLS session. */
1899
1900 else
1901 TLS_NEGOTIATE:
1902 {
1903 address_item * addr;
1904 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1905 # ifdef EXPERIMENTAL_DANE
1906 , sx->dane ? &tlsa_dnsa : NULL
1907 # endif
1908 );
1909
1910 /* TLS negotiation failed; give an error. From outside, this function may
1911 be called again to try in clear on a new connection, if the options permit
1912 it for this host. */
1913
1914 if (rc != OK)
1915 {
1916 # ifdef EXPERIMENTAL_DANE
1917 if (sx->dane) log_write(0, LOG_MAIN,
1918 "DANE attempt failed; no TLS connection to %s [%s]",
1919 sx->host->name, sx->host->address);
1920 # endif
1921
1922 save_errno = ERRNO_TLSFAILURE;
1923 message = US"failure while setting up TLS session";
1924 sx->send_quit = FALSE;
1925 goto TLS_FAILED;
1926 }
1927
1928 /* TLS session is set up */
1929
1930 smtp_peer_options_wrap = smtp_peer_options;
1931 for (addr = sx->addrlist; addr; addr = addr->next)
1932 if (addr->transport_return == PENDING_DEFER)
1933 {
1934 addr->cipher = tls_out.cipher;
1935 addr->ourcert = tls_out.ourcert;
1936 addr->peercert = tls_out.peercert;
1937 addr->peerdn = tls_out.peerdn;
1938 addr->ocsp = tls_out.ocsp;
1939 }
1940 }
1941 }
1942
1943 /* if smtps, we'll have smtp_command set to something else; always safe to
1944 reset it here. */
1945 smtp_command = big_buffer;
1946
1947 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1948 helo_data is null, we are dealing with a connection that was passed from
1949 another process, and so we won't have expanded helo_data above. We have to
1950 expand it here. $sending_ip_address and $sending_port are set up right at the
1951 start of the Exim process (in exim.c). */
1952
1953 if (tls_out.active >= 0)
1954 {
1955 char *greeting_cmd;
1956 BOOL good_response;
1957
1958 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1959 {
1960 uschar *message = string_sprintf("failed to expand helo_data: %s",
1961 expand_string_message);
1962 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1963 yield = DEFER;
1964 goto SEND_QUIT;
1965 }
1966
1967 /* For SMTPS we need to wait for the initial OK response. */
1968 if (sx->smtps)
1969 {
1970 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1971 '2', sx->ob->command_timeout);
1972 #ifdef EXPERIMENTAL_DSN_INFO
1973 sx->smtp_greeting = string_copy(sx->buffer);
1974 #endif
1975 if (!good_response) goto RESPONSE_FAILED;
1976 }
1977
1978 if (sx->esmtp)
1979 greeting_cmd = "EHLO";
1980 else
1981 {
1982 greeting_cmd = "HELO";
1983 DEBUG(D_transport)
1984 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1985 }
1986
1987 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1988 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1989 goto SEND_FAILED;
1990 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1991 '2', sx->ob->command_timeout);
1992 #ifdef EXPERIMENTAL_DSN_INFO
1993 sx->helo_response = string_copy(sx->buffer);
1994 #endif
1995 if (!good_response) goto RESPONSE_FAILED;
1996 smtp_peer_options = 0;
1997 }
1998
1999 /* If the host is required to use a secure channel, ensure that we
2000 have one. */
2001
2002 else if ( sx->smtps
2003 # ifdef EXPERIMENTAL_DANE
2004 || sx->dane
2005 # endif
2006 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2007 )
2008 {
2009 save_errno = ERRNO_TLSREQUIRED;
2010 message = string_sprintf("a TLS session is required, but %s",
2011 smtp_peer_options & PEER_OFFERED_TLS
2012 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2013 goto TLS_FAILED;
2014 }
2015 #endif /*SUPPORT_TLS*/
2016
2017 /* If TLS is active, we have just started it up and re-done the EHLO command,
2018 so its response needs to be analyzed. If TLS is not active and this is a
2019 continued session down a previously-used socket, we haven't just done EHLO, so
2020 we skip this. */
2021
2022 if (continue_hostname == NULL
2023 #ifdef SUPPORT_TLS
2024 || tls_out.active >= 0
2025 #endif
2026 )
2027 {
2028 if (sx->esmtp || sx->lmtp)
2029 {
2030 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2031 0 /* no TLS */
2032 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2033 | PEER_OFFERED_CHUNKING
2034 | PEER_OFFERED_PRDR
2035 #ifdef SUPPORT_I18N
2036 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2037 /*XXX if we hand peercaps on to continued-conn processes,
2038 must not depend on this addr */
2039 #endif
2040 | PEER_OFFERED_DSN
2041 | PEER_OFFERED_PIPE
2042 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2043 );
2044
2045 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2046 lmtp_ignore_quota option was set. */
2047
2048 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2049
2050 /* If the response to EHLO specified support for the SIZE parameter, note
2051 this, provided size_addition is non-negative. */
2052
2053 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2054
2055 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2056 the current host, esmtp will be false, so PIPELINING can never be used. If
2057 the current host matches hosts_avoid_pipelining, don't do it. */
2058
2059 if ( sx->peer_offered & PEER_OFFERED_PIPE
2060 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2061 smtp_peer_options |= PEER_OFFERED_PIPE;
2062
2063 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2064 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2065
2066 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2067 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2068 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2069
2070 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2071 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2072
2073 #ifndef DISABLE_PRDR
2074 if ( sx->peer_offered & PEER_OFFERED_PRDR
2075 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2076 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2077
2078 if (sx->peer_offered & PEER_OFFERED_PRDR)
2079 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2080 #endif
2081
2082 /* Note if the server supports DSN */
2083 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2084 DEBUG(D_transport) debug_printf("%susing DSN\n",
2085 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2086
2087 /* Note if the response to EHLO specifies support for the AUTH extension.
2088 If it has, check that this host is one we want to authenticate to, and do
2089 the business. The host name and address must be available when the
2090 authenticator's client driver is running. */
2091
2092 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2093 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2094 {
2095 default: goto SEND_QUIT;
2096 case OK: break;
2097 case FAIL_SEND: goto SEND_FAILED;
2098 case FAIL: goto RESPONSE_FAILED;
2099 }
2100 }
2101 }
2102 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2103
2104 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2105 message-specific. */
2106
2107 sx->setting_up = FALSE;
2108
2109 #ifdef SUPPORT_I18N
2110 if (sx->addrlist->prop.utf8_msg)
2111 {
2112 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2113 && !sx->addrlist->prop.utf8_downcvt_maybe;
2114 DEBUG(D_transport) if (!sx->utf8_needed)
2115 debug_printf("utf8: %s downconvert\n",
2116 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2117 }
2118
2119 /* If this is an international message we need the host to speak SMTPUTF8 */
2120 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2121 {
2122 errno = ERRNO_UTF8_FWD;
2123 goto RESPONSE_FAILED;
2124 }
2125 #endif
2126
2127 return OK;
2128
2129
2130 {
2131 int code;
2132 uschar * set_message;
2133
2134 RESPONSE_FAILED:
2135 {
2136 save_errno = errno;
2137 message = NULL;
2138 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2139 sx->buffer, &code, &message, &pass_message);
2140 goto FAILED;
2141 }
2142
2143 SEND_FAILED:
2144 {
2145 save_errno = errno;
2146 code = '4';
2147 message = US string_sprintf("send() to %s [%s] failed: %s",
2148 sx->host->name, sx->host->address, strerror(save_errno));
2149 sx->send_quit = FALSE;
2150 goto FAILED;
2151 }
2152
2153 /* This label is jumped to directly when a TLS negotiation has failed,
2154 or was not done for a host for which it is required. Values will be set
2155 in message and save_errno, and setting_up will always be true. Treat as
2156 a temporary error. */
2157
2158 #ifdef SUPPORT_TLS
2159 TLS_FAILED:
2160 code = '4';
2161 #endif
2162
2163 /* The failure happened while setting up the call; see if the failure was
2164 a 5xx response (this will either be on connection, or following HELO - a 5xx
2165 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2166 never going to accept them. For other errors during setting up (timeouts or
2167 whatever), defer all addresses, and yield DEFER, so that the host is not
2168 tried again for a while. */
2169
2170 FAILED:
2171 sx->ok = FALSE; /* For when reached by GOTO */
2172 set_message = message;
2173
2174 yield = code == '5'
2175 #ifdef SUPPORT_I18N
2176 || errno == ERRNO_UTF8_FWD
2177 #endif
2178 ? FAIL : DEFER;
2179
2180 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2181 #ifdef EXPERIMENTAL_DSN_INFO
2182 , sx->smtp_greeting, sx->helo_response
2183 #endif
2184 );
2185 }
2186
2187
2188 SEND_QUIT:
2189
2190 if (sx->send_quit)
2191 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2192
2193 #ifdef SUPPORT_TLS
2194 tls_close(FALSE, TRUE);
2195 #endif
2196
2197 /* Close the socket, and return the appropriate value, first setting
2198 works because the NULL setting is passed back to the calling process, and
2199 remote_max_parallel is forced to 1 when delivering over an existing connection,
2200
2201 If all went well and continue_more is set, we shouldn't actually get here if
2202 there are further addresses, as the return above will be taken. However,
2203 writing RSET might have failed, or there may be other addresses whose hosts are
2204 specified in the transports, and therefore not visible at top level, in which
2205 case continue_more won't get set. */
2206
2207 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2208 if (sx->send_quit)
2209 {
2210 shutdown(sx->outblock.sock, SHUT_WR);
2211 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2212 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2213 rc--; /* drain socket */
2214 sx->send_quit = FALSE;
2215 }
2216 (void)close(sx->inblock.sock);
2217 sx->inblock.sock = sx->outblock.sock = -1;
2218
2219 #ifndef DISABLE_EVENT
2220 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2221 #endif
2222
2223 continue_transport = NULL;
2224 continue_hostname = NULL;
2225 return yield;
2226 }
2227
2228
2229
2230
2231 /* Create the string of options that will be appended to the MAIL FROM:
2232 in the connection context buffer */
2233
2234 static int
2235 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2236 {
2237 uschar * p = sx->buffer;
2238 address_item * addr;
2239 int address_count;
2240
2241 *p = 0;
2242
2243 /* If we know the receiving MTA supports the SIZE qualification,
2244 send it, adding something to the message size to allow for imprecision
2245 and things that get added en route. Exim keeps the number of lines
2246 in a message, so we can give an accurate value for the original message, but we
2247 need some additional to handle added headers. (Double "." characters don't get
2248 included in the count.) */
2249
2250 if (sx->peer_offered & PEER_OFFERED_SIZE)
2251 {
2252 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2253 while (*p) p++;
2254 }
2255
2256 #ifndef DISABLE_PRDR
2257 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2258 request that */
2259
2260 sx->prdr_active = FALSE;
2261 if (sx->peer_offered & PEER_OFFERED_PRDR)
2262 for (addr = addrlist; addr; addr = addr->next)
2263 if (addr->transport_return == PENDING_DEFER)
2264 {
2265 for (addr = addr->next; addr; addr = addr->next)
2266 if (addr->transport_return == PENDING_DEFER)
2267 { /* at least two recipients to send */
2268 sx->prdr_active = TRUE;
2269 sprintf(CS p, " PRDR"); p += 5;
2270 break;
2271 }
2272 break;
2273 }
2274 #endif
2275
2276 #ifdef SUPPORT_I18N
2277 /* If it supports internationalised messages, and this meesage need that,
2278 request it */
2279
2280 if ( sx->peer_offered & PEER_OFFERED_UTF8
2281 && addrlist->prop.utf8_msg
2282 && !addrlist->prop.utf8_downcvt
2283 )
2284 Ustrcpy(p, " SMTPUTF8"), p += 9;
2285 #endif
2286
2287 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2288 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2289 addr && address_count < sx->max_rcpt;
2290 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2291 {
2292 address_count++;
2293 if (!(addr->dsn_flags & rf_dsnlasthop))
2294 {
2295 sx->dsn_all_lasthop = FALSE;
2296 break;
2297 }
2298 }
2299
2300 /* Add any DSN flags to the mail command */
2301
2302 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2303 {
2304 if (dsn_ret == dsn_ret_hdrs)
2305 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2306 else if (dsn_ret == dsn_ret_full)
2307 { Ustrcpy(p, " RET=FULL"); p += 9; }
2308
2309 if (dsn_envid)
2310 {
2311 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2312 while (*p) p++;
2313 }
2314 }
2315
2316 /* If an authenticated_sender override has been specified for this transport
2317 instance, expand it. If the expansion is forced to fail, and there was already
2318 an authenticated_sender for this message, the original value will be used.
2319 Other expansion failures are serious. An empty result is ignored, but there is
2320 otherwise no check - this feature is expected to be used with LMTP and other
2321 cases where non-standard addresses (e.g. without domains) might be required. */
2322
2323 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2324 return ERROR;
2325
2326 return OK;
2327 }
2328
2329
2330 static void
2331 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2332 {
2333 uschar * p = sx->buffer;
2334 *p = 0;
2335
2336 /* Add any DSN flags to the rcpt command */
2337
2338 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2339 {
2340 if (addr->dsn_flags & rf_dsnflags)
2341 {
2342 int i;
2343 BOOL first = TRUE;
2344
2345 Ustrcpy(p, " NOTIFY=");
2346 while (*p) p++;
2347 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2348 {
2349 if (!first) *p++ = ',';
2350 first = FALSE;
2351 Ustrcpy(p, rf_names[i]);
2352 while (*p) p++;
2353 }
2354 }
2355
2356 if (addr->dsn_orcpt)
2357 {
2358 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2359 addr->dsn_orcpt);
2360 while (*p) p++;
2361 }
2362 }
2363 }
2364
2365
2366
2367 /*
2368 Return:
2369 0 good
2370 -1 MAIL response error, any read i/o error
2371 -2 non-MAIL response timeout
2372 -3 internal error; channel still usable
2373 -4 transmit failed
2374 */
2375
2376 int
2377 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2378 {
2379 address_item * addr;
2380 int address_count;
2381 int rc;
2382
2383 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2384 {
2385 *yield = ERROR;
2386 return -3;
2387 }
2388
2389 /* From here until we send the DATA command, we can make use of PIPELINING
2390 if the server host supports it. The code has to be able to check the responses
2391 at any point, for when the buffer fills up, so we write it totally generally.
2392 When PIPELINING is off, each command written reports that it has flushed the
2393 buffer. */
2394
2395 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2396
2397 {
2398 uschar * s = sx->from_addr;
2399 #ifdef SUPPORT_I18N
2400 uschar * errstr = NULL;
2401
2402 /* If we must downconvert, do the from-address here. Remember we had to
2403 for the to-addresses (done below), and also (ugly) for re-doing when building
2404 the delivery log line. */
2405
2406 if ( sx->addrlist->prop.utf8_msg
2407 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2408 )
2409 {
2410 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2411 {
2412 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2413 *yield = ERROR;
2414 return -3;
2415 }
2416 setflag(sx->addrlist, af_utf8_downcvt);
2417 }
2418 #endif
2419
2420 rc = smtp_write_command(&sx->outblock, pipelining_active,
2421 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2422 }
2423
2424 mail_command = string_copy(big_buffer); /* Save for later error message */
2425
2426 switch(rc)
2427 {
2428 case -1: /* Transmission error */
2429 return -4;
2430
2431 case +1: /* Block was sent */
2432 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2433 sx->ob->command_timeout))
2434 {
2435 if (errno == 0 && sx->buffer[0] == '4')
2436 {
2437 errno = ERRNO_MAIL4XX;
2438 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2439 }
2440 return -1;
2441 }
2442 sx->pending_MAIL = FALSE;
2443 break;
2444 }
2445
2446 /* Pass over all the relevant recipient addresses for this host, which are the
2447 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2448 several before we have to read the responses for those seen so far. This
2449 checking is done by a subroutine because it also needs to be done at the end.
2450 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2451 the next one if not all are sent.
2452
2453 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2454 last address because we want to abort if any recipients have any kind of
2455 problem, temporary or permanent. We know that all recipient addresses will have
2456 the PENDING_DEFER status, because only one attempt is ever made, and we know
2457 that max_rcpt will be large, so all addresses will be done at once. */
2458
2459 for (addr = sx->first_addr, address_count = 0;
2460 addr && address_count < sx->max_rcpt;
2461 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2462 {
2463 int count;
2464 BOOL no_flush;
2465 uschar * rcpt_addr;
2466
2467 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2468 ? dsn_support_yes : dsn_support_no;
2469
2470 address_count++;
2471 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2472
2473 build_rcptcmd_options(sx, addr);
2474
2475 /* Now send the RCPT command, and process outstanding responses when
2476 necessary. After a timeout on RCPT, we just end the function, leaving the
2477 yield as OK, because this error can often mean that there is a problem with
2478 just one address, so we don't want to delay the host. */
2479
2480 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2481
2482 #ifdef SUPPORT_I18N
2483 if ( testflag(sx->addrlist, af_utf8_downcvt)
2484 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2485 )
2486 {
2487 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2488 errno = ERRNO_EXPANDFAIL;
2489 return -4; /*XXX too harsh? */
2490 }
2491 #endif
2492
2493 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2494 rcpt_addr, sx->igquotstr, sx->buffer);
2495
2496 if (count < 0) return -4;
2497 if (count > 0)
2498 {
2499 switch(sync_responses(sx->first_addr, sx->tblock->rcpt_include_affixes,
2500 &sx->sync_addr, sx->host, count, sx->ob->address_retry_include_sender,
2501 sx->pending_MAIL, 0, &sx->inblock, sx->ob->command_timeout, sx->buffer,
2502 sizeof(sx->buffer)))
2503 {
2504 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2505 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2506 break;
2507
2508 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2509 if (!sx->lmtp) /* can't tell about progress yet */
2510 sx->completed_addr = TRUE;
2511 case 0: /* No 2xx or 5xx, but no probs */
2512 break;
2513
2514 case -1: return -2; /* Timeout on RCPT */
2515 default: return -1; /* I/O error, or any MAIL error */
2516 }
2517 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2518 }
2519 } /* Loop for next address */
2520
2521 sx->next_addr = addr;
2522 return 0;
2523 }
2524
2525
2526 /*************************************************
2527 * Deliver address list to given host *
2528 *************************************************/
2529
2530 /* If continue_hostname is not null, we get here only when continuing to
2531 deliver down an existing channel. The channel was passed as the standard
2532 input. TLS is never active on a passed channel; the previous process always
2533 closes it down before passing the connection on.
2534
2535 Otherwise, we have to make a connection to the remote host, and do the
2536 initial protocol exchange.
2537
2538 When running as an MUA wrapper, if the sender or any recipient is rejected,
2539 temporarily or permanently, we force failure for all recipients.
2540
2541 Arguments:
2542 addrlist chain of potential addresses to deliver; only those whose
2543 transport_return field is set to PENDING_DEFER are currently
2544 being processed; others should be skipped - they have either
2545 been delivered to an earlier host or IP address, or been
2546 failed by one of them.
2547 host host to deliver to
2548 host_af AF_INET or AF_INET6
2549 port default TCP/IP port to use, in host byte order
2550 interface interface to bind to, or NULL
2551 tblock transport instance block
2552 message_defer set TRUE if yield is OK, but all addresses were deferred
2553 because of a non-recipient, non-host failure, that is, a
2554 4xx response to MAIL FROM, DATA, or ".". This is a defer
2555 that is specific to the message.
2556 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2557 a second attempt after TLS initialization fails
2558
2559 Returns: OK - the connection was made and the delivery attempted;
2560 the result for each address is in its data block.
2561 DEFER - the connection could not be made, or something failed
2562 while setting up the SMTP session, or there was a
2563 non-message-specific error, such as a timeout.
2564 ERROR - a filter command is specified for this transport,
2565 and there was a problem setting it up; OR helo_data
2566 or add_headers or authenticated_sender is specified
2567 for this transport, and the string failed to expand
2568 */
2569
2570 static int
2571 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2572 uschar *interface, transport_instance *tblock,
2573 BOOL *message_defer, BOOL suppress_tls)
2574 {
2575 address_item *addr;
2576 int yield = OK;
2577 int save_errno;
2578 int rc;
2579 time_t start_delivery_time = time(NULL);
2580
2581 BOOL pass_message = FALSE;
2582 uschar *message = NULL;
2583 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2584 uschar *p;
2585
2586 smtp_context sx;
2587
2588 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2589 *message_defer = FALSE;
2590
2591 sx.addrlist = addrlist;
2592 sx.host = host;
2593 sx.host_af = host_af,
2594 sx.port = port;
2595 sx.interface = interface;
2596 sx.helo_data = NULL;
2597 sx.tblock = tblock;
2598
2599 /* Get the channel set up ready for a message (MAIL FROM being the next
2600 SMTP command to send */
2601
2602 if ((rc = smtp_setup_conn(&sx, suppress_tls, FALSE)) != OK)
2603 return rc;
2604
2605 /* If there is a filter command specified for this transport, we can now
2606 set it up. This cannot be done until the identify of the host is known. */
2607
2608 if (tblock->filter_command != NULL)
2609 {
2610 BOOL rc;
2611 uschar fbuf[64];
2612 sprintf(CS fbuf, "%.50s transport", tblock->name);
2613 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2614 TRUE, DEFER, addrlist, fbuf, NULL);
2615 transport_filter_timeout = tblock->filter_timeout;
2616
2617 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2618 yield ERROR. */
2619
2620 if (!rc)
2621 {
2622 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2623 FALSE);
2624 yield = ERROR;
2625 goto SEND_QUIT;
2626 }
2627
2628 if ( transport_filter_argv
2629 && *transport_filter_argv
2630 && **transport_filter_argv
2631 && sx.peer_offered & PEER_OFFERED_CHUNKING
2632 )
2633 {
2634 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2635 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2636 }
2637 }
2638
2639
2640 /* For messages that have more than the maximum number of envelope recipients,
2641 we want to send several transactions down the same SMTP connection. (See
2642 comments in deliver.c as to how this reconciles, heuristically, with
2643 remote_max_parallel.) This optimization was added to Exim after the following
2644 code was already working. The simplest way to put it in without disturbing the
2645 code was to use a goto to jump back to this point when there is another
2646 transaction to handle. */
2647
2648 SEND_MESSAGE:
2649 sx.from_addr = return_path;
2650 sx.first_addr = sx.sync_addr = addrlist;
2651 sx.ok = FALSE;
2652 sx.send_rset = TRUE;
2653 sx.completed_addr = FALSE;
2654
2655
2656 /* Initiate a message transfer. */
2657
2658 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2659 {
2660 case 0: break;
2661 case -1: goto RESPONSE_FAILED;
2662 case -2: goto END_OFF;
2663 case -3: goto SEND_QUIT;
2664 default: goto SEND_FAILED;
2665 }
2666
2667 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2668 permanently or temporarily. We should have flushed and synced after the last
2669 RCPT. */
2670
2671 if (mua_wrapper)
2672 {
2673 address_item *badaddr;
2674 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2675 if (badaddr->transport_return != PENDING_OK)
2676 {
2677 /*XXX could we find a better errno than 0 here? */
2678 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2679 testflag(badaddr, af_pass_message));
2680 sx.ok = FALSE;
2681 break;
2682 }
2683 }
2684
2685 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2686 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2687 have a good recipient buffered up if we are pipelining. We don't want to waste
2688 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2689 are pipelining. The responses are all handled by sync_responses().
2690 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2691 to send is. */
2692
2693 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2694 && (sx.ok || (pipelining_active && !mua_wrapper)))
2695 {
2696 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2697
2698 if (count < 0) goto SEND_FAILED;
2699 switch(sync_responses(sx.first_addr, tblock->rcpt_include_affixes, &sx.sync_addr,
2700 host, count, sx.ob->address_retry_include_sender, sx.pending_MAIL,
2701 sx.ok ? +1 : -1, &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2702 {
2703 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2704 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2705 break;
2706
2707 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2708 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2709 case 0: break; /* No 2xx or 5xx, but no probs */
2710
2711 case -1: goto END_OFF; /* Timeout on RCPT */
2712 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2713 }
2714 pipelining_active = FALSE;
2715 data_command = string_copy(big_buffer); /* Save for later error message */
2716 }
2717
2718 /* If there were no good recipients (but otherwise there have been no
2719 problems), just set ok TRUE, since we have handled address-specific errors
2720 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2721 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2722 well as body. Set the appropriate timeout value to be used for each chunk.
2723 (Haven't been able to make it work using select() for writing yet.) */
2724
2725 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2726 {
2727 /* Save the first address of the next batch. */
2728 sx.first_addr = sx.next_addr;
2729
2730 sx.ok = TRUE;
2731 }
2732 else
2733 {
2734 transport_ctx tctx = {
2735 tblock,
2736 addrlist,
2737 US".", US"..", /* Escaping strings */
2738 topt_use_crlf | topt_escape_headers
2739 | (tblock->body_only ? topt_no_headers : 0)
2740 | (tblock->headers_only ? topt_no_body : 0)
2741 | (tblock->return_path_add ? topt_add_return_path : 0)
2742 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2743 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2744 };
2745
2746 /* If using CHUNKING we need a callback from the generic transport
2747 support to us, for the sending of BDAT smtp commands and the reaping
2748 of responses. The callback needs a whole bunch of state so set up
2749 a transport-context structure to be passed around. */
2750
2751 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2752 {
2753 tctx.check_string = tctx.escape_string = NULL;
2754 tctx.options |= topt_use_bdat;
2755 tctx.chunk_cb = smtp_chunk_cmd_callback;
2756 tctx.inblock = &sx.inblock;
2757 tctx.outblock = &sx.outblock;
2758 tctx.host = host;
2759 tctx.first_addr = sx.first_addr;
2760 tctx.sync_addr = &sx.sync_addr;
2761 tctx.pending_MAIL = sx.pending_MAIL;
2762 tctx.pending_BDAT = FALSE;
2763 tctx.good_RCPT = sx.ok;
2764 tctx.completed_address = &sx.completed_addr;
2765 tctx.cmd_count = 0;
2766 tctx.buffer = sx.buffer;
2767 }
2768 else
2769 tctx.options |= topt_end_dot;
2770
2771 /* Save the first address of the next batch. */
2772 sx.first_addr = sx.next_addr;
2773
2774 /* Responses from CHUNKING commands go in buffer. Otherwise,
2775 there has not been a response. */
2776
2777 sx.buffer[0] = 0;
2778
2779 sigalrm_seen = FALSE;
2780 transport_write_timeout = sx.ob->data_timeout;
2781 smtp_command = US"sending data block"; /* For error messages */
2782 DEBUG(D_transport|D_v)
2783 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2784 debug_printf(" will write message using CHUNKING\n");
2785 else
2786 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2787 transport_count = 0;
2788
2789 #ifndef DISABLE_DKIM
2790 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2791 #else
2792 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2793 #endif
2794
2795 /* transport_write_message() uses write() because it is called from other
2796 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2797 it can exit with "Broken pipe" as its error. This really means that the
2798 socket got closed at the far end. */
2799
2800 transport_write_timeout = 0; /* for subsequent transports */
2801
2802 /* Failure can either be some kind of I/O disaster (including timeout),
2803 or the failure of a transport filter or the expansion of added headers.
2804 Or, when CHUNKING, it can be a protocol-detected failure. */
2805
2806 if (!sx.ok)
2807 goto RESPONSE_FAILED;
2808
2809 /* We used to send the terminating "." explicitly here, but because of
2810 buffering effects at both ends of TCP/IP connections, you don't gain
2811 anything by keeping it separate, so it might as well go in the final
2812 data buffer for efficiency. This is now done by setting the topt_end_dot
2813 flag above. */
2814
2815 smtp_command = US"end of data";
2816
2817 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2818 {
2819 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2820 switch(sync_responses(sx.first_addr, tblock->rcpt_include_affixes, &sx.sync_addr,
2821 host, tctx.cmd_count-1, sx.ob->address_retry_include_sender,
2822 sx.pending_MAIL, 0,
2823 &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2824 {
2825 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2826 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2827 break;
2828
2829 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2830 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2831 case 0: break; /* No 2xx or 5xx, but no probs */
2832
2833 case -1: goto END_OFF; /* Timeout on RCPT */
2834 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2835 }
2836 }
2837
2838 #ifndef DISABLE_PRDR
2839 /* For PRDR we optionally get a partial-responses warning
2840 * followed by the individual responses, before going on with
2841 * the overall response. If we don't get the warning then deal
2842 * with per non-PRDR. */
2843 if(sx.prdr_active)
2844 {
2845 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2846 sx.ob->final_timeout);
2847 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2848 {
2849 case '2': sx.prdr_active = FALSE;
2850 sx.ok = TRUE;
2851 break;
2852 case '4': errno = ERRNO_DATA4XX;
2853 addrlist->more_errno |=
2854 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2855 break;
2856 }
2857 }
2858 else
2859 #endif
2860
2861 /* For non-PRDR SMTP, we now read a single response that applies to the
2862 whole message. If it is OK, then all the addresses have been delivered. */
2863
2864 if (!sx.lmtp)
2865 {
2866 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2867 sx.ob->final_timeout);
2868 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2869 {
2870 errno = ERRNO_DATA4XX;
2871 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2872 }
2873 }
2874
2875 /* For LMTP, we get back a response for every RCPT command that we sent;
2876 some may be accepted and some rejected. For those that get a response, their
2877 status is fixed; any that are accepted have been handed over, even if later
2878 responses crash - at least, that's how I read RFC 2033.
2879
2880 If all went well, mark the recipient addresses as completed, record which
2881 host/IPaddress they were delivered to, and cut out RSET when sending another
2882 message down the same channel. Write the completed addresses to the journal
2883 now so that they are recorded in case there is a crash of hardware or
2884 software before the spool gets updated. Also record the final SMTP
2885 confirmation if needed (for SMTP only). */
2886
2887 if (sx.ok)
2888 {
2889 int flag = '=';
2890 int delivery_time = (int)(time(NULL) - start_delivery_time);
2891 int len;
2892 uschar *conf = NULL;
2893
2894 sx.send_rset = FALSE;
2895 pipelining_active = FALSE;
2896
2897 /* Set up confirmation if needed - applies only to SMTP */
2898
2899 if (
2900 #ifdef DISABLE_EVENT
2901 LOGGING(smtp_confirmation) &&
2902 #endif
2903 !sx.lmtp
2904 )
2905 {
2906 const uschar *s = string_printing(sx.buffer);
2907 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2908 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2909 }
2910
2911 /* Process all transported addresses - for LMTP or PRDR, read a status for
2912 each one. */
2913
2914 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2915 {
2916 if (addr->transport_return != PENDING_OK) continue;
2917
2918 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2919 remaining addresses. Otherwise, it's a return code for just the one
2920 address. For temporary errors, add a retry item for the address so that
2921 it doesn't get tried again too soon. */
2922
2923 #ifndef DISABLE_PRDR
2924 if (sx.lmtp || sx.prdr_active)
2925 #else
2926 if (sx.lmtp)
2927 #endif
2928 {
2929 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2930 sx.ob->final_timeout))
2931 {
2932 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2933 addr->message = string_sprintf(
2934 #ifndef DISABLE_PRDR
2935 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2936 #else
2937 "LMTP error after %s: %s",
2938 #endif
2939 data_command, string_printing(sx.buffer));
2940 setflag(addr, af_pass_message); /* Allow message to go to user */
2941 if (sx.buffer[0] == '5')
2942 addr->transport_return = FAIL;
2943 else
2944 {
2945 errno = ERRNO_DATA4XX;
2946 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2947 addr->transport_return = DEFER;
2948 #ifndef DISABLE_PRDR
2949 if (!sx.prdr_active)
2950 #endif
2951 retry_add_item(addr, addr->address_retry_key, 0);
2952 }
2953 continue;
2954 }
2955 sx.completed_addr = TRUE; /* NOW we can set this flag */
2956 if (LOGGING(smtp_confirmation))
2957 {
2958 const uschar *s = string_printing(sx.buffer);
2959 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2960 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2961 }
2962 }
2963
2964 /* SMTP, or success return from LMTP for this address. Pass back the
2965 actual host that was used. */
2966
2967 addr->transport_return = OK;
2968 addr->more_errno = delivery_time;
2969 addr->host_used = host;
2970 addr->special_action = flag;
2971 addr->message = conf;
2972 #ifndef DISABLE_PRDR
2973 if (sx.prdr_active) addr->flags |= af_prdr_used;
2974 #endif
2975 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2976 flag = '-';
2977
2978 #ifndef DISABLE_PRDR
2979 if (!sx.prdr_active)
2980 #endif
2981 {
2982 /* Update the journal. For homonymic addresses, use the base address plus
2983 the transport name. See lots of comments in deliver.c about the reasons
2984 for the complications when homonyms are involved. Just carry on after
2985 write error, as it may prove possible to update the spool file later. */
2986
2987 if (testflag(addr, af_homonym))
2988 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2989 else
2990 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2991
2992 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2993 len = Ustrlen(CS sx.buffer);
2994 if (write(journal_fd, sx.buffer, len) != len)
2995 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2996 "%s: %s", sx.buffer, strerror(errno));
2997 }
2998 }
2999
3000 #ifndef DISABLE_PRDR
3001 if (sx.prdr_active)
3002 {
3003 /* PRDR - get the final, overall response. For any non-success
3004 upgrade all the address statuses. */
3005 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3006 sx.ob->final_timeout);
3007 if (!sx.ok)
3008 {
3009 if(errno == 0 && sx.buffer[0] == '4')
3010 {
3011 errno = ERRNO_DATA4XX;
3012 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3013 }
3014 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3015 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3016 addr->transport_return = PENDING_OK; /* allow set_errno action */
3017 goto RESPONSE_FAILED;
3018 }
3019
3020 /* Update the journal, or setup retry. */
3021 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3022 if (addr->transport_return == OK)
3023 {
3024 if (testflag(addr, af_homonym))
3025 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3026 else
3027 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3028
3029 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3030 len = Ustrlen(CS sx.buffer);
3031 if (write(journal_fd, sx.buffer, len) != len)
3032 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3033 "%s: %s", sx.buffer, strerror(errno));
3034 }
3035 else if (addr->transport_return == DEFER)
3036 retry_add_item(addr, addr->address_retry_key, -2);
3037 }
3038 #endif
3039
3040 /* Ensure the journal file is pushed out to disk. */
3041
3042 if (EXIMfsync(journal_fd) < 0)
3043 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3044 strerror(errno));
3045 }
3046 }
3047
3048
3049 /* Handle general (not specific to one address) failures here. The value of ok
3050 is used to skip over this code on the falling through case. A timeout causes a
3051 deferral. Other errors may defer or fail according to the response code, and
3052 may set up a special errno value, e.g. after connection chopped, which is
3053 assumed if errno == 0 and there is no text in the buffer. If control reaches
3054 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3055 the problem is not related to this specific message. */
3056
3057 if (!sx.ok)
3058 {
3059 int code, set_rc;
3060 uschar * set_message;
3061
3062 RESPONSE_FAILED:
3063 {
3064 save_errno = errno;
3065 message = NULL;
3066 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3067 sx.buffer, &code, &message, &pass_message);
3068 goto FAILED;
3069 }
3070
3071 SEND_FAILED:
3072 {
3073 save_errno = errno;
3074 code = '4';
3075 message = US string_sprintf("send() to %s [%s] failed: %s",
3076 host->name, host->address, strerror(save_errno));
3077 sx.send_quit = FALSE;
3078 goto FAILED;
3079 }
3080
3081 FAILED:
3082 {
3083 BOOL message_error;
3084
3085 sx.ok = FALSE; /* For when reached by GOTO */
3086 set_message = message;
3087
3088 /* We want to handle timeouts after MAIL or "." and loss of connection after
3089 "." specially. They can indicate a problem with the sender address or with
3090 the contents of the message rather than a real error on the connection. These
3091 cases are treated in the same way as a 4xx response. This next bit of code
3092 does the classification. */
3093
3094 switch(save_errno)
3095 {
3096 case 0:
3097 case ERRNO_MAIL4XX:
3098 case ERRNO_DATA4XX:
3099 message_error = TRUE;
3100 break;
3101
3102 case ETIMEDOUT:
3103 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3104 Ustrncmp(smtp_command,"end ",4) == 0;
3105 break;
3106
3107 case ERRNO_SMTPCLOSED:
3108 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3109 break;
3110
3111 default:
3112 message_error = FALSE;
3113 break;
3114 }
3115
3116 /* Handle the cases that are treated as message errors. These are:
3117
3118 (a) negative response or timeout after MAIL
3119 (b) negative response after DATA
3120 (c) negative response or timeout or dropped connection after "."
3121 (d) utf8 support required and not offered
3122
3123 It won't be a negative response or timeout after RCPT, as that is dealt
3124 with separately above. The action in all cases is to set an appropriate
3125 error code for all the addresses, but to leave yield set to OK because the
3126 host itself has not failed. Of course, it might in practice have failed
3127 when we've had a timeout, but if so, we'll discover that at the next
3128 delivery attempt. For a temporary error, set the message_defer flag, and
3129 write to the logs for information if this is not the last host. The error
3130 for the last host will be logged as part of the address's log line. */
3131
3132 if (message_error)
3133 {
3134 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3135
3136 /* If there's an errno, the message contains just the identity of
3137 the host. */
3138
3139 if (code == '5')
3140 set_rc = FAIL;
3141 else /* Anything other than 5 is treated as temporary */
3142 {
3143 set_rc = DEFER;
3144 if (save_errno > 0)
3145 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3146 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3147 msglog_line(host, message);
3148 *message_defer = TRUE;
3149 }
3150 }
3151
3152 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3153 ".", or some other transportation error. We defer all addresses and yield
3154 DEFER, except for the case of failed add_headers expansion, or a transport
3155 filter failure, when the yield should be ERROR, to stop it trying other
3156 hosts. */
3157
3158 else
3159 {
3160 set_rc = DEFER;
3161 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3162 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3163 }
3164 }
3165
3166 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3167 #ifdef EXPERIMENTAL_DSN_INFO
3168 , sx.smtp_greeting, sx.helo_response
3169 #endif
3170 );
3171 }
3172
3173
3174 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3175 SMTP session tidily. However, if there were too many addresses to send in one
3176 message (indicated by first_addr being non-NULL) we want to carry on with the
3177 rest of them. Also, it is desirable to send more than one message down the SMTP
3178 connection if there are several waiting, provided we haven't already sent so
3179 many as to hit the configured limit. The function transport_check_waiting looks
3180 for a waiting message and returns its id. Then transport_pass_socket tries to
3181 set up a continued delivery by passing the socket on to another process. The
3182 variable send_rset is FALSE if a message has just been successfully transfered.
3183
3184 If we are already sending down a continued channel, there may be further
3185 addresses not yet delivered that are aimed at the same host, but which have not
3186 been passed in this run of the transport. In this case, continue_more will be
3187 true, and all we should do is send RSET if necessary, and return, leaving the
3188 channel open.
3189
3190 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3191 do not want to continue with other messages down the same channel, because that
3192 can lead to looping between two or more messages, all with the same,
3193 temporarily failing address(es). [The retry information isn't updated yet, so
3194 new processes keep on trying.] We probably also don't want to try more of this
3195 message's addresses either.
3196
3197 If we have started a TLS session, we have to end it before passing the
3198 connection to a new process. However, not all servers can handle this (Exim
3199 can), so we do not pass such a connection on if the host matches
3200 hosts_nopass_tls. */
3201
3202 DEBUG(D_transport)
3203 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3204 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3205 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3206
3207 if (sx.completed_addr && sx.ok && sx.send_quit)
3208 {
3209 BOOL more;
3210 smtp_compare_t t_compare;
3211
3212 t_compare.tblock = tblock;
3213 t_compare.current_sender_address = sender_address;
3214
3215 if ( sx.first_addr != NULL
3216 || continue_more
3217 || ( ( tls_out.active < 0
3218 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3219 )
3220 &&
3221 transport_check_waiting(tblock->name, host->name,
3222 tblock->connection_max_messages, new_message_id, &more,
3223 (oicf)smtp_are_same_identities, (void*)&t_compare)
3224 ) )
3225 {
3226 uschar *msg;
3227 BOOL pass_message;
3228
3229 if (sx.send_rset)
3230 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3231 {
3232 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3233 host->address, strerror(save_errno));
3234 sx.send_quit = FALSE;
3235 }
3236 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3237 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3238 {
3239 int code;
3240 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3241 &pass_message);
3242 if (!sx.send_quit)
3243 {
3244 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3245 host->name, host->address, msg);
3246 }
3247 }
3248
3249 /* Either RSET was not needed, or it succeeded */
3250
3251 if (sx.ok)
3252 {
3253 if (sx.first_addr != NULL) /* More addresses still to be sent */
3254 { /* in this run of the transport */
3255 continue_sequence++; /* Causes * in logging */
3256 goto SEND_MESSAGE;
3257 }
3258 if (continue_more) return yield; /* More addresses for another run */
3259
3260 /* Pass the socket to a new Exim process. Before doing so, we must shut
3261 down TLS. Not all MTAs allow for the continuation of the SMTP session
3262 when TLS is shut down. We test for this by sending a new EHLO. If we
3263 don't get a good response, we don't attempt to pass the socket on. */
3264
3265 #ifdef SUPPORT_TLS
3266 if (tls_out.active >= 0)
3267 {
3268 tls_close(FALSE, TRUE);
3269 smtp_peer_options = smtp_peer_options_wrap;
3270 sx.ok = !sx.smtps
3271 && smtp_write_command(&sx.outblock, FALSE,
3272 "EHLO %s\r\n", sx.helo_data) >= 0
3273 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3274 '2', sx.ob->command_timeout);
3275 }
3276 #endif
3277
3278 /* If the socket is successfully passed, we mustn't send QUIT (or
3279 indeed anything!) from here. */
3280
3281 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3282 propagate it from the initial
3283 */
3284 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3285 host->address, new_message_id, sx.inblock.sock))
3286 sx.send_quit = FALSE;
3287 }
3288
3289 /* If RSET failed and there are addresses left, they get deferred. */
3290
3291 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3292 #ifdef EXPERIMENTAL_DSN_INFO
3293 , sx.smtp_greeting, sx.helo_response
3294 #endif
3295 );
3296 }
3297 }
3298
3299 /* End off tidily with QUIT unless the connection has died or the socket has
3300 been passed to another process. There has been discussion on the net about what
3301 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3302 to wait for a response, but on the other hand, there isn't anything one can do
3303 with an error response, other than log it. Exim used to do that. However,
3304 further discussion suggested that it is positively advantageous not to wait for
3305 the response, but to close the session immediately. This is supposed to move
3306 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3307 load from the server. (Hosts that are both servers and clients may not see much
3308 difference, of course.) Further discussion indicated that this was safe to do
3309 on Unix systems which have decent implementations of TCP/IP that leave the
3310 connection around for a while (TIME_WAIT) after the application has gone away.
3311 This enables the response sent by the server to be properly ACKed rather than
3312 timed out, as can happen on broken TCP/IP implementations on other OS.
3313
3314 This change is being made on 31-Jul-98. After over a year of trouble-free
3315 operation, the old commented-out code was removed on 17-Sep-99. */
3316
3317 SEND_QUIT:
3318 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3319
3320 END_OFF:
3321
3322 #ifdef SUPPORT_TLS
3323 tls_close(FALSE, TRUE);
3324 #endif
3325
3326 /* Close the socket, and return the appropriate value, first setting
3327 works because the NULL setting is passed back to the calling process, and
3328 remote_max_parallel is forced to 1 when delivering over an existing connection,
3329
3330 If all went well and continue_more is set, we shouldn't actually get here if
3331 there are further addresses, as the return above will be taken. However,
3332 writing RSET might have failed, or there may be other addresses whose hosts are
3333 specified in the transports, and therefore not visible at top level, in which
3334 case continue_more won't get set. */
3335
3336 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3337 if (sx.send_quit)
3338 {
3339 shutdown(sx.outblock.sock, SHUT_WR);
3340 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3341 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3342 rc--; /* drain socket */
3343 }
3344 (void)close(sx.inblock.sock);
3345
3346 #ifndef DISABLE_EVENT
3347 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3348 #endif
3349
3350 continue_transport = NULL;
3351 continue_hostname = NULL;
3352 return yield;
3353 }
3354
3355
3356
3357
3358 /*************************************************
3359 * Closedown entry point *
3360 *************************************************/
3361
3362 /* This function is called when exim is passed an open smtp channel
3363 from another incarnation, but the message which it has been asked
3364 to deliver no longer exists. The channel is on stdin.
3365
3366 We might do fancy things like looking for another message to send down
3367 the channel, but if the one we sought has gone, it has probably been
3368 delivered by some other process that itself will seek further messages,
3369 so just close down our connection.
3370
3371 Argument: pointer to the transport instance block
3372 Returns: nothing
3373 */
3374
3375 void
3376 smtp_transport_closedown(transport_instance *tblock)
3377 {
3378 smtp_transport_options_block *ob =
3379 (smtp_transport_options_block *)tblock->options_block;
3380 smtp_inblock inblock;
3381 smtp_outblock outblock;
3382 uschar buffer[256];
3383 uschar inbuffer[4096];
3384 uschar outbuffer[16];
3385
3386 inblock.sock = fileno(stdin);
3387 inblock.buffer = inbuffer;
3388 inblock.buffersize = sizeof(inbuffer);
3389 inblock.ptr = inbuffer;
3390 inblock.ptrend = inbuffer;
3391
3392 outblock.sock = inblock.sock;
3393 outblock.buffersize = sizeof(outbuffer);
3394 outblock.buffer = outbuffer;
3395 outblock.ptr = outbuffer;
3396 outblock.cmd_count = 0;
3397 outblock.authenticating = FALSE;
3398
3399 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3400 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3401 ob->command_timeout);
3402 (void)close(inblock.sock);
3403 }
3404
3405
3406
3407 /*************************************************
3408 * Prepare addresses for delivery *
3409 *************************************************/
3410
3411 /* This function is called to flush out error settings from previous delivery
3412 attempts to other hosts. It also records whether we got here via an MX record
3413 or not in the more_errno field of the address. We are interested only in
3414 addresses that are still marked DEFER - others may have got delivered to a
3415 previously considered IP address. Set their status to PENDING_DEFER to indicate
3416 which ones are relevant this time.
3417
3418 Arguments:
3419 addrlist the list of addresses
3420 host the host we are delivering to
3421
3422 Returns: the first address for this delivery
3423 */
3424
3425 static address_item *
3426 prepare_addresses(address_item *addrlist, host_item *host)
3427 {
3428 address_item *first_addr = NULL;
3429 address_item *addr;
3430 for (addr = addrlist; addr; addr = addr->next)
3431 if (addr->transport_return == DEFER)
3432 {
3433 if (!first_addr) first_addr = addr;
3434 addr->transport_return = PENDING_DEFER;
3435 addr->basic_errno = 0;
3436 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3437 addr->message = NULL;
3438 #ifdef SUPPORT_TLS
3439 addr->cipher = NULL;
3440 addr->ourcert = NULL;
3441 addr->peercert = NULL;
3442 addr->peerdn = NULL;
3443 addr->ocsp = OCSP_NOT_REQ;
3444 #endif
3445 #ifdef EXPERIMENTAL_DSN_INFO
3446 addr->smtp_greeting = NULL;
3447 addr->helo_response = NULL;
3448 #endif
3449 }
3450 return first_addr;
3451 }
3452
3453
3454
3455 /*************************************************
3456 * Main entry point *
3457 *************************************************/
3458
3459 /* See local README for interface details. As this is a remote transport, it is
3460 given a chain of addresses to be delivered in one connection, if possible. It
3461 always returns TRUE, indicating that each address has its own independent
3462 status set, except if there is a setting up problem, in which case it returns
3463 FALSE. */
3464
3465 BOOL
3466 smtp_transport_entry(
3467 transport_instance *tblock, /* data for this instantiation */
3468 address_item *addrlist) /* addresses we are working on */
3469 {
3470 int cutoff_retry;
3471 int port;
3472 int hosts_defer = 0;
3473 int hosts_fail = 0;
3474 int hosts_looked_up = 0;
3475 int hosts_retry = 0;
3476 int hosts_serial = 0;
3477 int hosts_total = 0;
3478 int total_hosts_tried = 0;
3479 address_item *addr;
3480 BOOL expired = TRUE;
3481 uschar *expanded_hosts = NULL;
3482 uschar *pistring;
3483 uschar *tid = string_sprintf("%s transport", tblock->name);
3484 smtp_transport_options_block *ob =
3485 (smtp_transport_options_block *)(tblock->options_block);
3486 host_item *hostlist = addrlist->host_list;
3487 host_item *host = NULL;
3488
3489 DEBUG(D_transport)
3490 {
3491 debug_printf("%s transport entered\n", tblock->name);
3492 for (addr = addrlist; addr; addr = addr->next)
3493 debug_printf(" %s\n", addr->address);
3494 if (hostlist)
3495 {
3496 debug_printf("hostlist:\n");
3497 for (host = hostlist; host; host = host->next)
3498 debug_printf(" %s:%d\n", host->name, host->port);
3499 }
3500 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3501 continue_hostname, continue_host_address);
3502 }
3503
3504 /* Set the flag requesting that these hosts be added to the waiting
3505 database if the delivery fails temporarily or if we are running with
3506 queue_smtp or a 2-stage queue run. This gets unset for certain
3507 kinds of error, typically those that are specific to the message. */
3508
3509 update_waiting = TRUE;
3510
3511 /* If a host list is not defined for the addresses - they must all have the
3512 same one in order to be passed to a single transport - or if the transport has
3513 a host list with hosts_override set, use the host list supplied with the
3514 transport. It is an error for this not to exist. */
3515
3516 if (!hostlist || (ob->hosts_override && ob->hosts))
3517 {
3518 if (!ob->hosts)
3519 {
3520 addrlist->message = string_sprintf("%s transport called with no hosts set",
3521 tblock->name);
3522 addrlist->transport_return = PANIC;
3523 return FALSE; /* Only top address has status */
3524 }
3525
3526 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3527 ob->hosts);
3528
3529 /* If the transport's host list contains no '$' characters, and we are not
3530 randomizing, it is fixed and therefore a chain of hosts can be built once
3531 and for all, and remembered for subsequent use by other calls to this
3532 transport. If, on the other hand, the host list does contain '$', or we are
3533 randomizing its order, we have to rebuild it each time. In the fixed case,
3534 as the hosts string will never be used again, it doesn't matter that we
3535 replace all the : characters with zeros. */
3536
3537 if (!ob->hostlist)
3538 {
3539 uschar *s = ob->hosts;
3540
3541 if (Ustrchr(s, '$') != NULL)
3542 {
3543 if (!(expanded_hosts = expand_string(s)))
3544 {
3545 addrlist->message = string_sprintf("failed to expand list of hosts "
3546 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3547 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3548 return FALSE; /* Only top address has status */
3549 }
3550 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3551 "\"%s\"\n", s, expanded_hosts);
3552 s = expanded_hosts;
3553 }
3554 else
3555 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3556
3557 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3558
3559 /* Check that the expansion yielded something useful. */
3560 if (!hostlist)
3561 {
3562 addrlist->message =
3563 string_sprintf("%s transport has empty hosts setting", tblock->name);
3564 addrlist->transport_return = PANIC;
3565 return FALSE; /* Only top address has status */
3566 }
3567
3568 /* If there was no expansion of hosts, save the host list for
3569 next time. */
3570
3571 if (!expanded_hosts) ob->hostlist = hostlist;
3572 }
3573
3574 /* This is not the first time this transport has been run in this delivery;
3575 the host list was built previously. */
3576
3577 else
3578 hostlist = ob->hostlist;
3579 }
3580
3581 /* The host list was supplied with the address. If hosts_randomize is set, we
3582 must sort it into a random order if it did not come from MX records and has not
3583 already been randomized (but don't bother if continuing down an existing
3584 connection). */
3585
3586 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3587 {
3588 host_item *newlist = NULL;
3589 while (hostlist)
3590 {
3591 host_item *h = hostlist;
3592 hostlist = hostlist->next;
3593
3594 h->sort_key = random_number(100);
3595
3596 if (!newlist)
3597 {
3598 h->next = NULL;
3599 newlist = h;
3600 }
3601 else if (h->sort_key < newlist->sort_key)
3602 {
3603 h->next = newlist;
3604 newlist = h;
3605 }
3606 else
3607 {
3608 host_item *hh = newlist;
3609 while (hh->next)
3610 {
3611 if (h->sort_key < hh->next->sort_key) break;
3612 hh = hh->next;
3613 }
3614 h->next = hh->next;
3615 hh->next = h;
3616 }
3617 }
3618
3619 hostlist = addrlist->host_list = newlist;
3620 }
3621
3622 /* Sort out the default port. */
3623
3624 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3625
3626 /* For each host-plus-IP-address on the list:
3627
3628 . If this is a continued delivery and the host isn't the one with the
3629 current connection, skip.
3630
3631 . If the status is unusable (i.e. previously failed or retry checked), skip.
3632
3633 . If no IP address set, get the address, either by turning the name into
3634 an address, calling gethostbyname if gethostbyname is on, or by calling
3635 the DNS. The DNS may yield multiple addresses, in which case insert the
3636 extra ones into the list.
3637
3638 . Get the retry data if not previously obtained for this address and set the
3639 field which remembers the state of this address. Skip if the retry time is
3640 not reached. If not, remember whether retry data was found. The retry string
3641 contains both the name and the IP address.
3642
3643 . Scan the list of addresses and mark those whose status is DEFER as
3644 PENDING_DEFER. These are the only ones that will be processed in this cycle
3645 of the hosts loop.
3646
3647 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3648 Some addresses may be successfully delivered, others may fail, and yet
3649 others may get temporary errors and so get marked DEFER.
3650
3651 . The return from the delivery attempt is OK if a connection was made and a
3652 valid SMTP dialogue was completed. Otherwise it is DEFER.
3653
3654 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3655
3656 . If fail to connect, or other defer state, add a retry item.
3657
3658 . If there are any addresses whose status is still DEFER, carry on to the
3659 next host/IPaddress, unless we have tried the number of hosts given
3660 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3661 there is some fancy logic for hosts_max_try that means its limit can be
3662 overstepped in some circumstances.
3663
3664 If we get to the end of the list, all hosts have deferred at least one address,
3665 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3666 delivery attempt to those hosts whose last try was before the arrival time of
3667 the current message. To cope with this, we have to go round the loop a second
3668 time. After that, set the status and error data for any addresses that haven't
3669 had it set already. */
3670
3671 for (cutoff_retry = 0;
3672 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3673 cutoff_retry++)
3674 {
3675 host_item *nexthost = NULL;
3676 int unexpired_hosts_tried = 0;
3677
3678 for (host = hostlist;
3679 host
3680 && unexpired_hosts_tried < ob->hosts_max_try
3681 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3682 host = nexthost)
3683 {
3684 int rc;
3685 int host_af;
3686 uschar *rs;
3687 BOOL host_is_expired = FALSE;
3688 BOOL message_defer = FALSE;
3689 BOOL some_deferred = FALSE;
3690 address_item *first_addr = NULL;
3691 uschar *interface = NULL;
3692 uschar *retry_host_key = NULL;
3693 uschar *retry_message_key = NULL;
3694 uschar *serialize_key = NULL;
3695
3696 /* Default next host is next host. :-) But this can vary if the
3697 hosts_max_try limit is hit (see below). It may also be reset if a host
3698 address is looked up here (in case the host was multihomed). */
3699
3700 nexthost = host->next;
3701
3702 /* If the address hasn't yet been obtained from the host name, look it up
3703 now, unless the host is already marked as unusable. If it is marked as
3704 unusable, it means that the router was unable to find its IP address (in
3705 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3706 the lookup failed last time. We don't get this far if *all* MX records
3707 point to non-existent hosts; that is treated as a hard error.
3708
3709 We can just skip this host entirely. When the hosts came from the router,
3710 the address will timeout based on the other host(s); when the address is
3711 looked up below, there is an explicit retry record added.
3712
3713 Note that we mustn't skip unusable hosts if the address is not unset; they
3714 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3715
3716 if (!host->address)
3717 {
3718 int new_port, flags;
3719 host_item *hh;
3720
3721 if (host->status >= hstatus_unusable)
3722 {
3723 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3724 host->name);
3725 continue;
3726 }
3727
3728 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3729
3730 /* The host name is permitted to have an attached port. Find it, and
3731 strip it from the name. Just remember it for now. */
3732
3733 new_port = host_item_get_port(host);
3734
3735 /* Count hosts looked up */
3736
3737 hosts_looked_up++;
3738
3739 /* Find by name if so configured, or if it's an IP address. We don't
3740 just copy the IP address, because we need the test-for-local to happen. */
3741
3742 flags = HOST_FIND_BY_A;
3743 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3744 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3745
3746 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3747 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3748 else
3749 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3750 &ob->dnssec, /* domains for request/require */
3751 NULL, NULL);
3752
3753 /* Update the host (and any additional blocks, resulting from
3754 multihoming) with a host-specific port, if any. */
3755
3756 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3757
3758 /* Failure to find the host at this time (usually DNS temporary failure)
3759 is really a kind of routing failure rather than a transport failure.
3760 Therefore we add a retry item of the routing kind, not to stop us trying
3761 to look this name up here again, but to ensure the address gets timed
3762 out if the failures go on long enough. A complete failure at this point
3763 commonly points to a configuration error, but the best action is still
3764 to carry on for the next host. */
3765
3766 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3767 {
3768 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3769 expired = FALSE;
3770 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3771 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3772 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3773 host->status = hstatus_unusable;
3774
3775 for (addr = addrlist; addr; addr = addr->next)
3776 {
3777 if (addr->transport_return != DEFER) continue;
3778 addr->basic_errno = ERRNO_UNKNOWNHOST;
3779 addr->message =
3780 string_sprintf("failed to lookup IP address for %s", host->name);
3781 }
3782 continue;
3783 }
3784
3785 /* If the host is actually the local host, we may have a problem, or
3786 there may be some cunning configuration going on. In the problem case,
3787 log things and give up. The default transport status is already DEFER. */
3788
3789 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3790 {
3791 for (addr = addrlist; addr; addr = addr->next)
3792 {
3793 addr->basic_errno = 0;
3794 addr->message = string_sprintf("%s transport found host %s to be "
3795 "local", tblock->name, host->name);
3796 }
3797 goto END_TRANSPORT;
3798 }
3799 } /* End of block for IP address lookup */
3800
3801 /* If this is a continued delivery, we are interested only in the host
3802 which matches the name of the existing open channel. The check is put
3803 here after the local host lookup, in case the name gets expanded as a
3804 result of the lookup. Set expired FALSE, to save the outer loop executing
3805 twice. */
3806
3807 if ( continue_hostname
3808 && ( Ustrcmp(continue_hostname, host->name) != 0
3809 || Ustrcmp(continue_host_address, host->address) != 0
3810 ) )
3811 {
3812 expired = FALSE;
3813 continue; /* With next host */
3814 }
3815
3816 /* Reset the default next host in case a multihomed host whose addresses
3817 are not looked up till just above added to the host list. */
3818
3819 nexthost = host->next;
3820
3821 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3822 domain is in queue_smtp_domains, we don't actually want to attempt any
3823 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3824 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3825 were not in it. We don't want to hold up all SMTP deliveries! Except when
3826 doing a two-stage queue run, don't do this if forcing. */
3827
3828 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3829 match_isinlist(addrlist->domain,
3830 (const uschar **)&queue_smtp_domains, 0,
3831 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3832 {
3833 expired = FALSE;
3834 for (addr = addrlist; addr; addr = addr->next)
3835 if (addr->transport_return == DEFER)
3836 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3837 continue; /* With next host */
3838 }
3839
3840 /* Count hosts being considered - purely for an intelligent comment
3841 if none are usable. */
3842
3843 hosts_total++;
3844
3845 /* Set $host and $host address now in case they are needed for the
3846 interface expansion or the serialize_hosts check; they remain set if an
3847 actual delivery happens. */
3848
3849 deliver_host = host->name;
3850 deliver_host_address = host->address;
3851 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3852 : host->dnssec == DS_NO ? US"no"
3853 : US"";
3854
3855 /* Set up a string for adding to the retry key if the port number is not
3856 the standard SMTP port. A host may have its own port setting that overrides
3857 the default. */
3858
3859 pistring = string_sprintf(":%d", host->port == PORT_NONE
3860 ? port : host->port);
3861 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3862
3863 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3864 string is set, even if constant (as different transports can have different
3865 constant settings), we must add it to the key that is used for retries,
3866 because connections to the same host from a different interface should be
3867 treated separately. */
3868
3869 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3870 if ((rs = ob->interface) && *rs)
3871 {
3872 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3873 return FALSE;
3874 pistring = string_sprintf("%s/%s", pistring, interface);
3875 }
3876
3877 /* The first time round the outer loop, check the status of the host by
3878 inspecting the retry data. The second time round, we are interested only
3879 in expired hosts that haven't been tried since this message arrived. */
3880
3881 if (cutoff_retry == 0)
3882 {
3883 BOOL incl_ip;
3884 /* Ensure the status of the address is set by checking retry data if
3885 necessary. There may be host-specific retry data (applicable to all
3886 messages) and also data for retries of a specific message at this host.
3887 If either of these retry records are actually read, the keys used are
3888 returned to save recomputing them later. */
3889
3890 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3891 US"retry_include_ip_address", ob->retry_include_ip_address,
3892 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3893 continue; /* with next host */
3894
3895 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3896 incl_ip, &retry_host_key, &retry_message_key);
3897
3898 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3899 (host->address == NULL)? US"" : host->address, pistring,
3900 (host->status == hstatus_usable)? "usable" :
3901 (host->status == hstatus_unusable)? "unusable" :
3902 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3903
3904 /* Skip this address if not usable at this time, noting if it wasn't
3905 actually expired, both locally and in the address. */
3906
3907 switch (host->status)
3908 {
3909 case hstatus_unusable:
3910 expired = FALSE;
3911 setflag(addrlist, af_retry_skipped);
3912 /* Fall through */
3913
3914 case hstatus_unusable_expired:
3915 switch (host->why)
3916 {
3917 case hwhy_retry: hosts_retry++; break;
3918 case hwhy_failed: hosts_fail++; break;
3919 case hwhy_deferred: hosts_defer++; break;
3920 }
3921
3922 /* If there was a retry message key, implying that previously there
3923 was a message-specific defer, we don't want to update the list of
3924 messages waiting for these hosts. */
3925
3926 if (retry_message_key) update_waiting = FALSE;
3927 continue; /* With the next host or IP address */
3928 }
3929 }
3930
3931 /* Second time round the loop: if the address is set but expired, and
3932 the message is newer than the last try, let it through. */
3933
3934 else
3935 {
3936 if ( !host->address
3937 || host->status != hstatus_unusable_expired
3938 || host->last_try > received_time)
3939 continue;
3940 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3941 host->name, host->address, pistring);
3942 host_is_expired = TRUE;
3943 }
3944
3945 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3946 it remains TRUE only if all hosts are expired and none are actually tried.
3947 */
3948
3949 expired = FALSE;
3950
3951 /* If this host is listed as one to which access must be serialized,
3952 see if another Exim process has a connection to it, and if so, skip
3953 this host. If not, update the database to record our connection to it
3954 and remember this for later deletion. Do not do any of this if we are
3955 sending the message down a pre-existing connection. */
3956
3957 if ( !continue_hostname
3958 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3959 {
3960 serialize_key = string_sprintf("host-serialize-%s", host->name);
3961 if (!enq_start(serialize_key, 1))
3962 {
3963 DEBUG(D_transport)
3964 debug_printf("skipping host %s because another Exim process "
3965 "is connected to it\n", host->name);
3966 hosts_serial++;
3967 continue;
3968 }
3969 }
3970
3971 /* OK, we have an IP address that is not waiting for its retry time to
3972 arrive (it might be expired) OR (second time round the loop) we have an
3973 expired host that hasn't been tried since the message arrived. Have a go
3974 at delivering the message to it. First prepare the addresses by flushing
3975 out the result of previous attempts, and finding the first address that
3976 is still to be delivered. */
3977
3978 first_addr = prepare_addresses(addrlist, host);
3979
3980 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3981 message_id, host->name, host->address, addrlist->address,
3982 addrlist->next ? ", ..." : "");
3983
3984 set_process_info("delivering %s to %s [%s] (%s%s)",
3985 message_id, host->name, host->address, addrlist->address,
3986 addrlist->next ? ", ..." : "");
3987
3988 /* This is not for real; don't do the delivery. If there are
3989 any remaining hosts, list them. */
3990
3991 if (dont_deliver)
3992 {
3993 host_item *host2;
3994 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3995 for (addr = addrlist; addr; addr = addr->next)
3996 {
3997 addr->host_used = host;
3998 addr->special_action = '*';
3999 addr->message = US"delivery bypassed by -N option";
4000 }
4001 DEBUG(D_transport)
4002 {
4003 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4004 "*** host and remaining hosts:\n", tblock->name);
4005 for (host2 = host; host2; host2 = host2->next)
4006 debug_printf(" %s [%s]\n", host2->name,
4007 host2->address ? host2->address : US"unset");
4008 }
4009 rc = OK;
4010 }
4011
4012 /* This is for real. If the host is expired, we don't count it for
4013 hosts_max_retry. This ensures that all hosts must expire before an address
4014 is timed out, unless hosts_max_try_hardlimit (which protects against
4015 lunatic DNS configurations) is reached.
4016
4017 If the host is not expired and we are about to hit the hosts_max_retry
4018 limit, check to see if there is a subsequent hosts with a different MX
4019 value. If so, make that the next host, and don't count this one. This is a
4020 heuristic to make sure that different MXs do get tried. With a normal kind
4021 of retry rule, they would get tried anyway when the earlier hosts were
4022 delayed, but if the domain has a "retry every time" type of rule - as is
4023 often used for the the very large ISPs, that won't happen. */
4024
4025 else
4026 {
4027 host_item * thost;
4028 /* Make a copy of the host if it is local to this invocation
4029 of the transport. */
4030
4031 if (expanded_hosts)
4032 {
4033 thost = store_get(sizeof(host_item));
4034 *thost = *host;
4035 thost->name = string_copy(host->name);
4036 thost->address = string_copy(host->address);
4037 }
4038 else
4039 thost = host;
4040
4041 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4042 {
4043 host_item *h;
4044 DEBUG(D_transport)
4045 debug_printf("hosts_max_try limit reached with this host\n");
4046 for (h = host; h; h = h->next) if (h->mx != host->mx)
4047 {
4048 nexthost = h;
4049 unexpired_hosts_tried--;
4050 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4051 "and will be tried\n");
4052 break;
4053 }
4054 }
4055
4056 /* Attempt the delivery. */
4057
4058 total_hosts_tried++;
4059 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4060 &message_defer, FALSE);
4061
4062 /* Yield is one of:
4063 OK => connection made, each address contains its result;
4064 message_defer is set for message-specific defers (when all
4065 recipients are marked defer)
4066 DEFER => there was a non-message-specific delivery problem;
4067 ERROR => there was a problem setting up the arguments for a filter,
4068 or there was a problem with expanding added headers
4069 */
4070
4071 /* If the result is not OK, there was a non-message-specific problem.
4072 If the result is DEFER, we need to write to the logs saying what happened
4073 for this particular host, except in the case of authentication and TLS
4074 failures, where the log has already been written. If all hosts defer a
4075 general message is written at the end. */
4076
4077 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4078 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4079 write_logs(first_addr, host);
4080
4081 #ifndef DISABLE_EVENT
4082 if (rc == DEFER)
4083 deferred_event_raise(first_addr, host);
4084 #endif
4085
4086 /* If STARTTLS was accepted, but there was a failure in setting up the
4087 TLS session (usually a certificate screwup), and the host is not in
4088 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4089 TLS forcibly turned off. We have to start from scratch with a new SMTP
4090 connection. That's why the retry is done from here, not from within
4091 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4092 session, so the in-clear transmission after those errors, if permitted,
4093 happens inside smtp_deliver().] */
4094
4095 #ifdef SUPPORT_TLS
4096 if ( rc == DEFER
4097 && first_addr->basic_errno == ERRNO_TLSFAILURE
4098 && ob->tls_tempfail_tryclear
4099 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4100 )
4101 {
4102 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4103 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4104 first_addr = prepare_addresses(addrlist, host);
4105 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4106 &message_defer, TRUE);
4107 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4108 write_logs(first_addr, host);
4109 # ifndef DISABLE_EVENT
4110 if (rc == DEFER)
4111 deferred_event_raise(first_addr, host);
4112 # endif
4113 }
4114 #endif /*SUPPORT_TLS*/
4115 }
4116
4117 /* Delivery attempt finished */
4118
4119 rs = rc == OK ? US"OK"
4120 : rc == DEFER ? US"DEFER"
4121 : rc == ERROR ? US"ERROR"
4122 : US"?";
4123
4124 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4125 message_id, host->name, host->address, addrlist->address,
4126 addrlist->next ? " (& others)" : "", rs);
4127
4128 /* Release serialization if set up */
4129
4130 if (serialize_key) enq_end(serialize_key);
4131
4132 /* If the result is DEFER, or if a host retry record is known to exist, we
4133 need to add an item to the retry chain for updating the retry database
4134 at the end of delivery. We only need to add the item to the top address,
4135 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4136 for any other delivery attempts using the same address. (It is copied into
4137 the unusable tree at the outer level, so even if different address blocks
4138 contain the same address, it still won't get tried again.) */
4139
4140 if (rc == DEFER || retry_host_key)
4141 {
4142 int delete_flag = rc != DEFER ? rf_delete : 0;
4143 if (!retry_host_key)
4144 {
4145 BOOL incl_ip;
4146 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4147 US"retry_include_ip_address", ob->retry_include_ip_address,
4148 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4149 incl_ip = TRUE; /* error; use most-specific retry record */
4150
4151 retry_host_key = incl_ip
4152 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4153 : string_sprintf("T:%S%s", host->name, pistring);
4154 }
4155
4156 /* If a delivery of another message over an existing SMTP connection
4157 yields DEFER, we do NOT set up retry data for the host. This covers the
4158 case when there are delays in routing the addresses in the second message
4159 that are so long that the server times out. This is alleviated by not
4160 routing addresses that previously had routing defers when handling an
4161 existing connection, but even so, this case may occur (e.g. if a
4162 previously happily routed address starts giving routing defers). If the
4163 host is genuinely down, another non-continued message delivery will
4164 notice it soon enough. */
4165
4166 if (delete_flag != 0 || !continue_hostname)
4167 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4168
4169 /* We may have tried an expired host, if its retry time has come; ensure
4170 the status reflects the expiry for the benefit of any other addresses. */
4171
4172 if (rc == DEFER)
4173 {
4174 host->status = host_is_expired
4175 ? hstatus_unusable_expired : hstatus_unusable;
4176 host->why = hwhy_deferred;
4177 }
4178 }
4179
4180 /* If message_defer is set (host was OK, but every recipient got deferred
4181 because of some message-specific problem), or if that had happened
4182 previously so that a message retry key exists, add an appropriate item
4183 to the retry chain. Note that if there was a message defer but now there is
4184 a host defer, the message defer record gets deleted. That seems perfectly
4185 reasonable. Also, stop the message from being remembered as waiting
4186 for specific hosts. */
4187
4188 if (message_defer || retry_message_key)
4189 {
4190 int delete_flag = message_defer ? 0 : rf_delete;
4191 if (!retry_message_key)
4192 {
4193 BOOL incl_ip;
4194 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4195 US"retry_include_ip_address", ob->retry_include_ip_address,
4196 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4197 incl_ip = TRUE; /* error; use most-specific retry record */
4198
4199 retry_message_key = incl_ip
4200 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4201 message_id)
4202 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4203 }
4204 retry_add_item(addrlist, retry_message_key,
4205 rf_message | rf_host | delete_flag);
4206 update_waiting = FALSE;
4207 }
4208
4209 /* Any return other than DEFER (that is, OK or ERROR) means that the
4210 addresses have got their final statuses filled in for this host. In the OK
4211 case, see if any of them are deferred. */
4212
4213 if (rc == OK)
4214 for (addr = addrlist; addr; addr = addr->next)
4215 if (addr->transport_return == DEFER)
4216 {
4217 some_deferred = TRUE;
4218 break;
4219 }
4220
4221 /* If no addresses deferred or the result was ERROR, return. We do this for
4222 ERROR because a failing filter set-up or add_headers expansion is likely to
4223 fail for any host we try. */
4224
4225 if (rc == ERROR || (rc == OK && !some_deferred))
4226 {
4227 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4228 return TRUE; /* Each address has its status */
4229 }
4230
4231 /* If the result was DEFER or some individual addresses deferred, let
4232 the loop run to try other hosts with the deferred addresses, except for the
4233 case when we were trying to deliver down an existing channel and failed.
4234 Don't try any other hosts in this case. */
4235
4236 if (continue_hostname) break;
4237
4238 /* If the whole delivery, or some individual addresses, were deferred and
4239 there are more hosts that could be tried, do not count this host towards
4240 the hosts_max_try limit if the age of the message is greater than the
4241 maximum retry time for this host. This means we may try try all hosts,
4242 ignoring the limit, when messages have been around for some time. This is
4243 important because if we don't try all hosts, the address will never time
4244 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4245
4246 if ((rc == DEFER || some_deferred) && nexthost)
4247 {
4248 BOOL timedout;
4249 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4250
4251 if (retry && retry->rules)
4252 {
4253 retry_rule *last_rule;
4254 for (last_rule = retry->rules;
4255 last_rule->next;
4256 last_rule = last_rule->next);
4257 timedout = time(NULL) - received_time > last_rule->timeout;
4258 }
4259 else timedout = TRUE; /* No rule => timed out */
4260
4261 if (timedout)
4262 {
4263 unexpired_hosts_tried--;
4264 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4265 "hosts_max_try (message older than host's retry time)\n");
4266 }
4267 }
4268 } /* End of loop for trying multiple hosts. */
4269
4270 /* This is the end of the loop that repeats iff expired is TRUE and
4271 ob->delay_after_cutoff is FALSE. The second time round we will
4272 try those hosts that haven't been tried since the message arrived. */
4273
4274 DEBUG(D_transport)
4275 {
4276 debug_printf("all IP addresses skipped or deferred at least one address\n");
4277 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4278 debug_printf("retrying IP addresses not tried since message arrived\n");
4279 }
4280 }
4281
4282
4283 /* Get here if all IP addresses are skipped or defer at least one address. In
4284 MUA wrapper mode, this will happen only for connection or other non-message-
4285 specific failures. Force the delivery status for all addresses to FAIL. */
4286
4287 if (mua_wrapper)
4288 {
4289 for (addr = addrlist; addr; addr = addr->next)
4290 addr->transport_return = FAIL;
4291 goto END_TRANSPORT;
4292 }
4293
4294 /* In the normal, non-wrapper case, add a standard message to each deferred
4295 address if there hasn't been an error, that is, if it hasn't actually been
4296 tried this time. The variable "expired" will be FALSE if any deliveries were
4297 actually tried, or if there was at least one host that was not expired. That
4298 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4299 a delivery has been tried, an error code will be set, and the failing of the
4300 message is handled by the retry code later.
4301
4302 If queue_smtp is set, or this transport was called to send a subsequent message
4303 down an existing TCP/IP connection, and something caused the host not to be
4304 found, we end up here, but can detect these cases and handle them specially. */
4305
4306 for (addr = addrlist; addr; addr = addr->next)
4307 {
4308 /* If host is not NULL, it means that we stopped processing the host list
4309 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4310 means we need to behave as if some hosts were skipped because their retry
4311 time had not come. Specifically, this prevents the address from timing out.
4312 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4313 hosts were tried. */
4314
4315 if (host)
4316 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4317 {
4318 DEBUG(D_transport)
4319 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4320 "hosts were tried\n");
4321 }
4322 else
4323 {
4324 DEBUG(D_transport)
4325 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4326 setflag(addr, af_retry_skipped);
4327 }
4328
4329 if (queue_smtp) /* no deliveries attempted */
4330 {
4331 addr->transport_return = DEFER;
4332 addr->basic_errno = 0;
4333 addr->message = US"SMTP delivery explicitly queued";
4334 }
4335
4336 else if ( addr->transport_return == DEFER
4337 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4338 && !addr->message
4339 )
4340 {
4341 addr->basic_errno = ERRNO_HRETRY;
4342 if (continue_hostname)
4343 addr->message = US"no host found for existing SMTP connection";
4344 else if (expired)
4345 {
4346 setflag(addr, af_pass_message); /* This is not a security risk */
4347 addr->message = string_sprintf(
4348 "all hosts%s have been failing for a long time %s",
4349 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4350 ob->delay_after_cutoff
4351 ? US"(and retry time not reached)"
4352 : US"and were last tried after this message arrived");
4353
4354 /* If we are already using fallback hosts, or there are no fallback hosts
4355 defined, convert the result to FAIL to cause a bounce. */
4356
4357 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4358 addr->transport_return = FAIL;
4359 }
4360 else
4361 {
4362 const char * s;
4363 if (hosts_retry == hosts_total)
4364 s = "retry time not reached for any host%s";
4365 else if (hosts_fail == hosts_total)
4366 s = "all host address lookups%s failed permanently";
4367 else if (hosts_defer == hosts_total)
4368 s = "all host address lookups%s failed temporarily";
4369 else if (hosts_serial == hosts_total)
4370 s = "connection limit reached for all hosts%s";
4371 else if (hosts_fail+hosts_defer == hosts_total)
4372 s = "all host address lookups%s failed";
4373 else
4374 s = "some host address lookups failed and retry time "
4375 "not reached for other hosts or connection limit reached%s";
4376
4377 addr->message = string_sprintf(s,
4378 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4379 }
4380 }
4381 }
4382
4383 /* Update the database which keeps information about which messages are waiting
4384 for which hosts to become available. For some message-specific errors, the
4385 update_waiting flag is turned off because we don't want follow-on deliveries in
4386 those cases. If this transport instance is explicitly limited to one message
4387 per connection then follow-on deliveries are not possible and there's no need
4388 to create/update the per-transport wait-<transport_name> database. */
4389
4390 if (update_waiting && tblock->connection_max_messages != 1)
4391 transport_update_waiting(hostlist, tblock->name);
4392
4393 END_TRANSPORT:
4394
4395 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4396
4397 return TRUE; /* Each address has its status */
4398 }
4399
4400 /* vi: aw ai sw=2
4401 */
4402 /* End of transport/smtp.c */
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