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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 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15 #define DELIVER_BUFFER_SIZE 4096
16
17
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
28
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
60 #endif
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
85 #ifdef SUPPORT_TLS
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
88 #endif
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
93 #ifdef SUPPORT_TLS
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
129 #ifndef DISABLE_PRDR
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 #endif
133 #ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136 #endif
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
157 #ifdef SUPPORT_SOCKS
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 #endif
161 #ifdef SUPPORT_TLS
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
184 #endif
185 };
186
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
189
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
193 /* Default private options block for the smtp transport. */
194
195 smtp_transport_options_block smtp_transport_option_defaults = {
196 NULL, /* hosts */
197 NULL, /* fallback_hosts */
198 NULL, /* hostlist */
199 NULL, /* fallback_hostlist */
200 NULL, /* authenticated_sender */
201 US"$primary_hostname", /* helo_data */
202 NULL, /* interface */
203 NULL, /* port */
204 US"smtp", /* protocol */
205 NULL, /* DSCP */
206 NULL, /* serialize_hosts */
207 NULL, /* hosts_try_auth */
208 NULL, /* hosts_require_auth */
209 US"*", /* hosts_try_chunking */
210 #ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
212 NULL, /* hosts_require_dane */
213 #endif
214 NULL, /* hosts_try_fastopen */
215 #ifndef DISABLE_PRDR
216 US"*", /* hosts_try_prdr */
217 #endif
218 #ifndef DISABLE_OCSP
219 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
220 NULL, /* hosts_require_ocsp */
221 #endif
222 NULL, /* hosts_require_tls */
223 NULL, /* hosts_avoid_tls */
224 NULL, /* hosts_verify_avoid_tls */
225 NULL, /* hosts_avoid_pipelining */
226 NULL, /* hosts_avoid_esmtp */
227 NULL, /* hosts_nopass_tls */
228 5*60, /* command_timeout */
229 5*60, /* connect_timeout; shorter system default overrides */
230 5*60, /* data timeout */
231 10*60, /* final timeout */
232 1024, /* size_addition */
233 5, /* hosts_max_try */
234 50, /* hosts_max_try_hardlimit */
235 TRUE, /* address_retry_include_sender */
236 FALSE, /* allow_localhost */
237 FALSE, /* authenticated_sender_force */
238 FALSE, /* gethostbyname */
239 TRUE, /* dns_qualify_single */
240 FALSE, /* dns_search_parents */
241 { NULL, NULL }, /* dnssec_domains {request,require} */
242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
246 FALSE, /* lmtp_ignore_quota */
247 NULL, /* expand_retry_include_ip_address */
248 TRUE /* retry_include_ip_address */
249 #ifdef SUPPORT_SOCKS
250 ,NULL /* socks_proxy */
251 #endif
252 #ifdef SUPPORT_TLS
253 ,NULL, /* tls_certificate */
254 NULL, /* tls_crl */
255 NULL, /* tls_privatekey */
256 NULL, /* tls_require_ciphers */
257 NULL, /* tls_sni */
258 US"system", /* tls_verify_certificates */
259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
263 US"*", /* tls_try_verify_hosts */
264 US"*" /* tls_verify_cert_hostnames */
265 #endif
266 #ifndef DISABLE_DKIM
267 , {NULL, /* dkim_canon */
268 NULL, /* dkim_domain */
269 NULL, /* dkim_private_key */
270 NULL, /* dkim_selector */
271 NULL, /* dkim_sign_headers */
272 NULL, /* dkim_strict */
273 FALSE} /* dot_stuffed */
274 #endif
275 };
276
277 /* some DSN flags for use later */
278
279 static int rf_list[] = {rf_notify_never, rf_notify_success,
280 rf_notify_failure, rf_notify_delay };
281
282 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
283
284
285
286 /* Local statics */
287
288 static uschar *smtp_command; /* Points to last cmd for error messages */
289 static uschar *mail_command; /* Points to MAIL cmd for error messages */
290 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
291 static BOOL update_waiting; /* TRUE to update the "wait" database */
292 static BOOL pipelining_active; /* current transaction is in pipe mode */
293
294
295 /*************************************************
296 * Setup entry point *
297 *************************************************/
298
299 /* This function is called when the transport is about to be used,
300 but before running it in a sub-process. It is used for two things:
301
302 (1) To set the fallback host list in addresses, when delivering.
303 (2) To pass back the interface, port, protocol, and other options, for use
304 during callout verification.
305
306 Arguments:
307 tblock pointer to the transport instance block
308 addrlist list of addresses about to be transported
309 tf if not NULL, pointer to block in which to return options
310 uid the uid that will be set (not used)
311 gid the gid that will be set (not used)
312 errmsg place for error message (not used)
313
314 Returns: OK always (FAIL, DEFER not used)
315 */
316
317 static int
318 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
319 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
320 {
321 smtp_transport_options_block *ob =
322 (smtp_transport_options_block *)(tblock->options_block);
323
324 errmsg = errmsg; /* Keep picky compilers happy */
325 uid = uid;
326 gid = gid;
327
328 /* Pass back options if required. This interface is getting very messy. */
329
330 if (tf != NULL)
331 {
332 tf->interface = ob->interface;
333 tf->port = ob->port;
334 tf->protocol = ob->protocol;
335 tf->hosts = ob->hosts;
336 tf->hosts_override = ob->hosts_override;
337 tf->hosts_randomize = ob->hosts_randomize;
338 tf->gethostbyname = ob->gethostbyname;
339 tf->qualify_single = ob->dns_qualify_single;
340 tf->search_parents = ob->dns_search_parents;
341 tf->helo_data = ob->helo_data;
342 }
343
344 /* Set the fallback host list for all the addresses that don't have fallback
345 host lists, provided that the local host wasn't present in the original host
346 list. */
347
348 if (!testflag(addrlist, af_local_host_removed))
349 {
350 for (; addrlist != NULL; addrlist = addrlist->next)
351 if (addrlist->fallback_hosts == NULL)
352 addrlist->fallback_hosts = ob->fallback_hostlist;
353 }
354
355 return OK;
356 }
357
358
359
360 /*************************************************
361 * Initialization entry point *
362 *************************************************/
363
364 /* Called for each instance, after its options have been read, to
365 enable consistency checks to be done, or anything else that needs
366 to be set up.
367
368 Argument: pointer to the transport instance block
369 Returns: nothing
370 */
371
372 void
373 smtp_transport_init(transport_instance *tblock)
374 {
375 smtp_transport_options_block *ob =
376 (smtp_transport_options_block *)(tblock->options_block);
377
378 /* Retry_use_local_part defaults FALSE if unset */
379
380 if (tblock->retry_use_local_part == TRUE_UNSET)
381 tblock->retry_use_local_part = FALSE;
382
383 /* Set the default port according to the protocol */
384
385 if (ob->port == NULL)
386 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
387 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
388
389 /* Set up the setup entry point, to be called before subprocesses for this
390 transport. */
391
392 tblock->setup = smtp_transport_setup;
393
394 /* Complain if any of the timeouts are zero. */
395
396 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
397 ob->final_timeout <= 0)
398 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
399 "command, data, or final timeout value is zero for %s transport",
400 tblock->name);
401
402 /* If hosts_override is set and there are local hosts, set the global
403 flag that stops verify from showing router hosts. */
404
405 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
406
407 /* If there are any fallback hosts listed, build a chain of host items
408 for them, but do not do any lookups at this time. */
409
410 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
411 }
412
413
414
415
416
417 /*************************************************
418 * Set delivery info into all active addresses *
419 *************************************************/
420
421 /* Only addresses whose status is >= PENDING are relevant. A lesser
422 status means that an address is not currently being processed.
423
424 Arguments:
425 addrlist points to a chain of addresses
426 errno_value to put in each address's errno field
427 msg to put in each address's message field
428 rc to put in each address's transport_return field
429 pass_message if TRUE, set the "pass message" flag in the address
430 host if set, mark addrs as having used this host
431 smtp_greeting from peer
432 helo_response from peer
433
434 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
435 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
436 this particular type of timeout.
437
438 Returns: nothing
439 */
440
441 static void
442 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
443 BOOL pass_message, host_item * host
444 #ifdef EXPERIMENTAL_DSN_INFO
445 , const uschar * smtp_greeting, const uschar * helo_response
446 #endif
447 )
448 {
449 address_item *addr;
450 int orvalue = 0;
451 if (errno_value == ERRNO_CONNECTTIMEOUT)
452 {
453 errno_value = ETIMEDOUT;
454 orvalue = RTEF_CTOUT;
455 }
456 for (addr = addrlist; addr; addr = addr->next)
457 if (addr->transport_return >= PENDING)
458 {
459 addr->basic_errno = errno_value;
460 addr->more_errno |= orvalue;
461 if (msg != NULL)
462 {
463 addr->message = msg;
464 if (pass_message) setflag(addr, af_pass_message);
465 }
466 addr->transport_return = rc;
467 if (host)
468 {
469 addr->host_used = host;
470 #ifdef EXPERIMENTAL_DSN_INFO
471 if (smtp_greeting)
472 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
473 addr->smtp_greeting = smtp_greeting;
474
475 if (helo_response)
476 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
477 addr->helo_response = helo_response;
478 #endif
479 }
480 }
481 }
482
483 static void
484 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
485 BOOL pass_message)
486 {
487 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
488 #ifdef EXPERIMENTAL_DSN_INFO
489 , NULL, NULL
490 #endif
491 );
492 }
493
494
495 /*************************************************
496 * Check an SMTP response *
497 *************************************************/
498
499 /* This function is given an errno code and the SMTP response buffer
500 to analyse, together with the host identification for generating messages. It
501 sets an appropriate message and puts the first digit of the response code into
502 the yield variable. If no response was actually read, a suitable digit is
503 chosen.
504
505 Arguments:
506 host the current host, to get its name for messages
507 errno_value pointer to the errno value
508 more_errno from the top address for use with ERRNO_FILTER_FAIL
509 buffer the SMTP response buffer
510 yield where to put a one-digit SMTP response code
511 message where to put an error message
512 pass_message set TRUE if message is an SMTP response
513
514 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
515 */
516
517 static BOOL
518 check_response(host_item *host, int *errno_value, int more_errno,
519 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
520 {
521 uschar * pl = pipelining_active ? US"pipelined " : US"";
522
523 *yield = '4'; /* Default setting is to give a temporary error */
524
525 /* Handle response timeout */
526
527 if (*errno_value == ETIMEDOUT)
528 {
529 *message = US string_sprintf("SMTP timeout after %s%s",
530 pl, smtp_command);
531 if (transport_count > 0)
532 *message = US string_sprintf("%s (%d bytes written)", *message,
533 transport_count);
534 return FALSE;
535 }
536
537 /* Handle malformed SMTP response */
538
539 if (*errno_value == ERRNO_SMTPFORMAT)
540 {
541 const uschar *malfresp = string_printing(buffer);
542 while (isspace(*malfresp)) malfresp++;
543 *message = *malfresp == 0
544 ? string_sprintf("Malformed SMTP reply (an empty line) "
545 "in response to %s%s", pl, smtp_command)
546 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
547 pl, smtp_command, malfresp);
548 return FALSE;
549 }
550
551 /* Handle a failed filter process error; can't send QUIT as we mustn't
552 end the DATA. */
553
554 if (*errno_value == ERRNO_FILTER_FAIL)
555 {
556 *message = US string_sprintf("transport filter process failed (%d)%s",
557 more_errno,
558 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
559 return FALSE;
560 }
561
562 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
563 end the DATA. */
564
565 if (*errno_value == ERRNO_CHHEADER_FAIL)
566 {
567 *message =
568 US string_sprintf("failed to expand headers_add or headers_remove: %s",
569 expand_string_message);
570 return FALSE;
571 }
572
573 /* Handle failure to write a complete data block */
574
575 if (*errno_value == ERRNO_WRITEINCOMPLETE)
576 {
577 *message = US string_sprintf("failed to write a data block");
578 return FALSE;
579 }
580
581 #ifdef SUPPORT_I18N
582 /* Handle lack of advertised SMTPUTF8, for international message */
583 if (*errno_value == ERRNO_UTF8_FWD)
584 {
585 *message = US"utf8 support required but not offered for forwarding";
586 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
587 return TRUE;
588 }
589 #endif
590
591 /* Handle error responses from the remote mailer. */
592
593 if (buffer[0] != 0)
594 {
595 const uschar *s = string_printing(buffer);
596 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
597 "%s", pl, smtp_command, s);
598 *pass_message = TRUE;
599 *yield = buffer[0];
600 return TRUE;
601 }
602
603 /* No data was read. If there is no errno, this must be the EOF (i.e.
604 connection closed) case, which causes deferral. An explicit connection reset
605 error has the same effect. Otherwise, put the host's identity in the message,
606 leaving the errno value to be interpreted as well. In all cases, we have to
607 assume the connection is now dead. */
608
609 if (*errno_value == 0 || *errno_value == ECONNRESET)
610 {
611 *errno_value = ERRNO_SMTPCLOSED;
612 *message = US string_sprintf("Remote host closed connection "
613 "in response to %s%s", pl, smtp_command);
614 }
615 else *message = US string_sprintf("%s [%s]", host->name, host->address);
616
617 return FALSE;
618 }
619
620
621
622 /*************************************************
623 * Write error message to logs *
624 *************************************************/
625
626 /* This writes to the main log and to the message log.
627
628 Arguments:
629 addr the address item containing error information
630 host the current host
631
632 Returns: nothing
633 */
634
635 static void
636 write_logs(address_item *addr, host_item *host)
637 {
638 uschar * message = LOGGING(outgoing_port)
639 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
640 host->port == PORT_NONE ? 25 : host->port)
641 : string_sprintf("H=%s [%s]", host->name, host->address);
642
643 if (addr->message)
644 {
645 message = string_sprintf("%s: %s", message, addr->message);
646 if (addr->basic_errno > 0)
647 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
648 log_write(0, LOG_MAIN, "%s", message);
649 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
650 }
651 else
652 {
653 const uschar * s = exim_errstr(addr->basic_errno);
654 log_write(0, LOG_MAIN, "%s %s", message, s);
655 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
656 }
657 }
658
659 static void
660 msglog_line(host_item * host, uschar * message)
661 {
662 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
663 host->name, host->address, message);
664 }
665
666
667
668 #ifndef DISABLE_EVENT
669 /*************************************************
670 * Post-defer action *
671 *************************************************/
672
673 /* This expands an arbitrary per-transport string.
674 It might, for example, be used to write to the database log.
675
676 Arguments:
677 addr the address item containing error information
678 host the current host
679
680 Returns: nothing
681 */
682
683 static void
684 deferred_event_raise(address_item *addr, host_item *host)
685 {
686 uschar * action = addr->transport->event_action;
687 const uschar * save_domain;
688 uschar * save_local;
689
690 if (!action)
691 return;
692
693 save_domain = deliver_domain;
694 save_local = deliver_localpart;
695
696 /*XXX would ip & port already be set up? */
697 deliver_host_address = string_copy(host->address);
698 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
699 event_defer_errno = addr->basic_errno;
700
701 router_name = addr->router->name;
702 transport_name = addr->transport->name;
703 deliver_domain = addr->domain;
704 deliver_localpart = addr->local_part;
705
706 (void) event_raise(action, US"msg:host:defer",
707 addr->message
708 ? addr->basic_errno > 0
709 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
710 : string_copy(addr->message)
711 : addr->basic_errno > 0
712 ? string_copy(US strerror(addr->basic_errno))
713 : NULL);
714
715 deliver_localpart = save_local;
716 deliver_domain = save_domain;
717 router_name = transport_name = NULL;
718 }
719 #endif
720
721 /*************************************************
722 * Synchronize SMTP responses *
723 *************************************************/
724
725 /* This function is called from smtp_deliver() to receive SMTP responses from
726 the server, and match them up with the commands to which they relate. When
727 PIPELINING is not in use, this function is called after every command, and is
728 therefore somewhat over-engineered, but it is simpler to use a single scheme
729 that works both with and without PIPELINING instead of having two separate sets
730 of code.
731
732 The set of commands that are buffered up with pipelining may start with MAIL
733 and may end with DATA; in between are RCPT commands that correspond to the
734 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
735 etc.) are never buffered.
736
737 Errors after MAIL or DATA abort the whole process leaving the response in the
738 buffer. After MAIL, pending responses are flushed, and the original command is
739 re-instated in big_buffer for error messages. For RCPT commands, the remote is
740 permitted to reject some recipient addresses while accepting others. However
741 certain errors clearly abort the whole process. Set the value in
742 transport_return to PENDING_OK if the address is accepted. If there is a
743 subsequent general error, it will get reset accordingly. If not, it will get
744 converted to OK at the end.
745
746 Arguments:
747 addrlist the complete address list
748 include_affixes TRUE if affixes include in RCPT
749 sync_addr ptr to the ptr of the one to start scanning at (updated)
750 host the host we are connected to
751 count the number of responses to read
752 address_retry_
753 include_sender true if 4xx retry is to include the sender it its key
754 pending_MAIL true if the first response is for MAIL
755 pending_DATA 0 if last command sent was not DATA
756 +1 if previously had a good recipient
757 -1 if not previously had a good recipient
758 inblock incoming SMTP block
759 timeout timeout value
760 buffer buffer for reading response
761 buffsize size of buffer
762
763 Returns: 3 if at least one address had 2xx and one had 5xx
764 2 if at least one address had 5xx but none had 2xx
765 1 if at least one host had a 2xx response, but none had 5xx
766 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
767 -1 timeout while reading RCPT response
768 -2 I/O or other non-response error for RCPT
769 -3 DATA or MAIL failed - errno and buffer set
770 */
771
772 static int
773 sync_responses(address_item *addrlist, BOOL include_affixes,
774 address_item **sync_addr, host_item *host, int count,
775 BOOL address_retry_include_sender, BOOL pending_MAIL,
776 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
777 int buffsize)
778 {
779 address_item *addr = *sync_addr;
780 int yield = 0;
781
782 /* Handle the response for a MAIL command. On error, reinstate the original
783 command in big_buffer for error message use, and flush any further pending
784 responses before returning, except after I/O errors and timeouts. */
785
786 if (pending_MAIL)
787 {
788 count--;
789 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
790 {
791 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
792 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
793 if (errno == 0 && buffer[0] != 0)
794 {
795 uschar flushbuffer[4096];
796 int save_errno = 0;
797 if (buffer[0] == '4')
798 {
799 save_errno = ERRNO_MAIL4XX;
800 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
801 }
802 while (count-- > 0)
803 {
804 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
805 '2', timeout)
806 && (errno != 0 || flushbuffer[0] == 0))
807 break;
808 }
809 errno = save_errno;
810 }
811
812 if (pending_DATA) count--; /* Number of RCPT responses to come */
813 while (count-- > 0) /* Mark any pending addrs with the host used */
814 {
815 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
816 addr->host_used = host;
817 addr = addr->next;
818 }
819 return -3;
820 }
821 }
822
823 if (pending_DATA) count--; /* Number of RCPT responses to come */
824
825 /* Read and handle the required number of RCPT responses, matching each one up
826 with an address by scanning for the next address whose status is PENDING_DEFER.
827 */
828
829 while (count-- > 0)
830 {
831 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
832
833 /* The address was accepted */
834 addr->host_used = host;
835
836 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
837 {
838 yield |= 1;
839 addr->transport_return = PENDING_OK;
840
841 /* If af_dr_retry_exists is set, there was a routing delay on this address;
842 ensure that any address-specific retry record is expunged. We do this both
843 for the basic key and for the version that also includes the sender. */
844
845 if (testflag(addr, af_dr_retry_exists))
846 {
847 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
848 sender_address);
849 retry_add_item(addr, altkey, rf_delete);
850 retry_add_item(addr, addr->address_retry_key, rf_delete);
851 }
852 }
853
854 /* Timeout while reading the response */
855
856 else if (errno == ETIMEDOUT)
857 {
858 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
859 transport_rcpt_address(addr, include_affixes));
860 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
861 retry_add_item(addr, addr->address_retry_key, 0);
862 update_waiting = FALSE;
863 return -1;
864 }
865
866 /* Handle other errors in obtaining an SMTP response by returning -1. This
867 will cause all the addresses to be deferred. Restore the SMTP command in
868 big_buffer for which we are checking the response, so the error message
869 makes sense. */
870
871 else if (errno != 0 || buffer[0] == 0)
872 {
873 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
874 transport_rcpt_address(addr, include_affixes));
875 return -2;
876 }
877
878 /* Handle SMTP permanent and temporary response codes. */
879
880 else
881 {
882 addr->message =
883 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
884 "%s", transport_rcpt_address(addr, include_affixes),
885 string_printing(buffer));
886 setflag(addr, af_pass_message);
887 msglog_line(host, addr->message);
888
889 /* The response was 5xx */
890
891 if (buffer[0] == '5')
892 {
893 addr->transport_return = FAIL;
894 yield |= 2;
895 }
896
897 /* The response was 4xx */
898
899 else
900 {
901 addr->transport_return = DEFER;
902 addr->basic_errno = ERRNO_RCPT4XX;
903 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
904
905 #ifndef DISABLE_EVENT
906 event_defer_errno = addr->more_errno;
907 msg_event_raise(US"msg:rcpt:host:defer", addr);
908 #endif
909
910 /* Log temporary errors if there are more hosts to be tried.
911 If not, log this last one in the == line. */
912
913 if (host->next)
914 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
915
916 #ifndef DISABLE_EVENT
917 else
918 msg_event_raise(US"msg:rcpt:defer", addr);
919 #endif
920
921 /* Do not put this message on the list of those waiting for specific
922 hosts, as otherwise it is likely to be tried too often. */
923
924 update_waiting = FALSE;
925
926 /* Add a retry item for the address so that it doesn't get tried again
927 too soon. If address_retry_include_sender is true, add the sender address
928 to the retry key. */
929
930 if (address_retry_include_sender)
931 {
932 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
933 sender_address);
934 retry_add_item(addr, altkey, 0);
935 }
936 else retry_add_item(addr, addr->address_retry_key, 0);
937 }
938 }
939 } /* Loop for next RCPT response */
940
941 /* Update where to start at for the next block of responses, unless we
942 have already handled all the addresses. */
943
944 if (addr != NULL) *sync_addr = addr->next;
945
946 /* Handle a response to DATA. If we have not had any good recipients, either
947 previously or in this block, the response is ignored. */
948
949 if (pending_DATA != 0 &&
950 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
951 {
952 int code;
953 uschar *msg;
954 BOOL pass_message;
955 if (pending_DATA > 0 || (yield & 1) != 0)
956 {
957 if (errno == 0 && buffer[0] == '4')
958 {
959 errno = ERRNO_DATA4XX;
960 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
961 }
962 return -3;
963 }
964 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
965 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
966 "is in use and there were no good recipients\n", msg);
967 }
968
969 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
970 present) received 3xx. If any RCPTs were handled and yielded anything other
971 than 4xx, yield will be set non-zero. */
972
973 return yield;
974 }
975
976
977
978 /* Do the client side of smtp-level authentication */
979 /*
980 Arguments:
981 buffer EHLO response from server (gets overwritten)
982 addrlist chain of potential addresses to deliver
983 host host to deliver to
984 ob transport options
985 ibp, obp comms channel control blocks
986
987 Returns:
988 OK Success, or failed (but not required): global "smtp_authenticated" set
989 DEFER Failed authentication (and was required)
990 ERROR Internal problem
991
992 FAIL_SEND Failed communications - transmit
993 FAIL - response
994 */
995
996 int
997 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
998 smtp_transport_options_block *ob, BOOL is_esmtp,
999 smtp_inblock *ibp, smtp_outblock *obp)
1000 {
1001 int require_auth;
1002 uschar *fail_reason = US"server did not advertise AUTH support";
1003
1004 smtp_authenticated = FALSE;
1005 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1006 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1007
1008 if (is_esmtp && !regex_AUTH) regex_AUTH =
1009 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1010 FALSE, TRUE);
1011
1012 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1013 {
1014 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1015 expand_nmax = -1; /* reset */
1016
1017 /* Must not do this check until after we have saved the result of the
1018 regex match above. */
1019
1020 if (require_auth == OK ||
1021 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1022 {
1023 auth_instance *au;
1024 fail_reason = US"no common mechanisms were found";
1025
1026 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1027
1028 /* Scan the configured authenticators looking for one which is configured
1029 for use as a client, which is not suppressed by client_condition, and
1030 whose name matches an authentication mechanism supported by the server.
1031 If one is found, attempt to authenticate by calling its client function.
1032 */
1033
1034 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1035 {
1036 uschar *p = names;
1037 if (!au->client ||
1038 (au->client_condition != NULL &&
1039 !expand_check_condition(au->client_condition, au->name,
1040 US"client authenticator")))
1041 {
1042 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1043 au->name,
1044 (au->client)? "client_condition is false" :
1045 "not configured as a client");
1046 continue;
1047 }
1048
1049 /* Loop to scan supported server mechanisms */
1050
1051 while (*p != 0)
1052 {
1053 int rc;
1054 int len = Ustrlen(au->public_name);
1055 while (isspace(*p)) p++;
1056
1057 if (strncmpic(au->public_name, p, len) != 0 ||
1058 (p[len] != 0 && !isspace(p[len])))
1059 {
1060 while (*p != 0 && !isspace(*p)) p++;
1061 continue;
1062 }
1063
1064 /* Found data for a listed mechanism. Call its client entry. Set
1065 a flag in the outblock so that data is overwritten after sending so
1066 that reflections don't show it. */
1067
1068 fail_reason = US"authentication attempt(s) failed";
1069 obp->authenticating = TRUE;
1070 rc = (au->info->clientcode)(au, ibp, obp,
1071 ob->command_timeout, buffer, bufsize);
1072 obp->authenticating = FALSE;
1073 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1074 au->name, rc);
1075
1076 /* A temporary authentication failure must hold up delivery to
1077 this host. After a permanent authentication failure, we carry on
1078 to try other authentication methods. If all fail hard, try to
1079 deliver the message unauthenticated unless require_auth was set. */
1080
1081 switch(rc)
1082 {
1083 case OK:
1084 smtp_authenticated = TRUE; /* stops the outer loop */
1085 client_authenticator = au->name;
1086 if (au->set_client_id != NULL)
1087 client_authenticated_id = expand_string(au->set_client_id);
1088 break;
1089
1090 /* Failure after writing a command */
1091
1092 case FAIL_SEND:
1093 return FAIL_SEND;
1094
1095 /* Failure after reading a response */
1096
1097 case FAIL:
1098 if (errno != 0 || buffer[0] != '5') return FAIL;
1099 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1100 au->name, host->name, host->address, buffer);
1101 break;
1102
1103 /* Failure by some other means. In effect, the authenticator
1104 decided it wasn't prepared to handle this case. Typically this
1105 is the result of "fail" in an expansion string. Do we need to
1106 log anything here? Feb 2006: a message is now put in the buffer
1107 if logging is required. */
1108
1109 case CANCELLED:
1110 if (*buffer != 0)
1111 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1112 "authentication H=%s [%s] %s", au->name, host->name,
1113 host->address, buffer);
1114 break;
1115
1116 /* Internal problem, message in buffer. */
1117
1118 case ERROR:
1119 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1120 DEFER, FALSE);
1121 return ERROR;
1122 }
1123
1124 break; /* If not authenticated, try next authenticator */
1125 } /* Loop for scanning supported server mechanisms */
1126 } /* Loop for further authenticators */
1127 }
1128 }
1129
1130 /* If we haven't authenticated, but are required to, give up. */
1131
1132 if (require_auth == OK && !smtp_authenticated)
1133 {
1134 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1135 string_sprintf("authentication required but %s", fail_reason), DEFER,
1136 FALSE);
1137 return DEFER;
1138 }
1139
1140 return OK;
1141 }
1142
1143
1144 /* Construct AUTH appendix string for MAIL TO */
1145 /*
1146 Arguments
1147 buffer to build string
1148 addrlist chain of potential addresses to deliver
1149 ob transport options
1150
1151 Globals smtp_authenticated
1152 client_authenticated_sender
1153 Return True on error, otherwise buffer has (possibly empty) terminated string
1154 */
1155
1156 BOOL
1157 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1158 smtp_transport_options_block *ob)
1159 {
1160 uschar *local_authenticated_sender = authenticated_sender;
1161
1162 #ifdef notdef
1163 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1164 #endif
1165
1166 if (ob->authenticated_sender != NULL)
1167 {
1168 uschar *new = expand_string(ob->authenticated_sender);
1169 if (new == NULL)
1170 {
1171 if (!expand_string_forcedfail)
1172 {
1173 uschar *message = string_sprintf("failed to expand "
1174 "authenticated_sender: %s", expand_string_message);
1175 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1176 return TRUE;
1177 }
1178 }
1179 else if (new[0] != 0) local_authenticated_sender = new;
1180 }
1181
1182 /* Add the authenticated sender address if present */
1183
1184 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1185 local_authenticated_sender != NULL)
1186 {
1187 string_format(buffer, bufsize, " AUTH=%s",
1188 auth_xtextencode(local_authenticated_sender,
1189 Ustrlen(local_authenticated_sender)));
1190 client_authenticated_sender = string_copy(local_authenticated_sender);
1191 }
1192 else
1193 *buffer= 0;
1194
1195 return FALSE;
1196 }
1197
1198
1199
1200 #ifdef EXPERIMENTAL_DANE
1201 /* Lookup TLSA record for host/port.
1202 Return: OK success with dnssec; DANE mode
1203 DEFER Do not use this host now, may retry later
1204 FAIL_FORCED No TLSA record; DANE not usable
1205 FAIL Do not use this connection
1206 */
1207
1208 int
1209 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1210 {
1211 /* move this out to host.c given the similarity to dns_lookup() ? */
1212 uschar buffer[300];
1213 const uschar * fullname = buffer;
1214
1215 /* TLSA lookup string */
1216 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1217
1218 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1219 {
1220 case DNS_SUCCEED:
1221 if (!dns_is_secure(dnsa))
1222 {
1223 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1224 return DEFER;
1225 }
1226 return OK;
1227
1228 case DNS_AGAIN:
1229 return DEFER; /* just defer this TLS'd conn */
1230
1231 case DNS_NODATA: /* no TLSA RR for this lookup */
1232 case DNS_NOMATCH: /* no records at all for this lookup */
1233 return dane_required ? FAIL : FAIL_FORCED;
1234
1235 default:
1236 case DNS_FAIL:
1237 return dane_required ? FAIL : DEFER;
1238 }
1239 }
1240 #endif
1241
1242
1243
1244 typedef struct smtp_compare_s
1245 {
1246 uschar *current_sender_address;
1247 struct transport_instance *tblock;
1248 } smtp_compare_t;
1249
1250
1251 /* Create a unique string that identifies this message, it is based on
1252 sender_address, helo_data and tls_certificate if enabled.
1253 */
1254
1255 static uschar *
1256 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1257 {
1258 address_item * addr1;
1259 uschar * if1 = US"";
1260 uschar * helo1 = US"";
1261 #ifdef SUPPORT_TLS
1262 uschar * tlsc1 = US"";
1263 #endif
1264 uschar * save_sender_address = sender_address;
1265 uschar * local_identity = NULL;
1266 smtp_transport_options_block * ob =
1267 (smtp_transport_options_block *)tblock->options_block;
1268
1269 sender_address = sender;
1270
1271 addr1 = deliver_make_addr (sender, TRUE);
1272 deliver_set_expansions(addr1);
1273
1274 if (ob->interface)
1275 if1 = expand_string(ob->interface);
1276
1277 if (ob->helo_data)
1278 helo1 = expand_string(ob->helo_data);
1279
1280 #ifdef SUPPORT_TLS
1281 if (ob->tls_certificate)
1282 tlsc1 = expand_string(ob->tls_certificate);
1283 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1284 #else
1285 local_identity = string_sprintf ("%s^%s", if1, helo1);
1286 #endif
1287
1288 deliver_set_expansions(NULL);
1289 sender_address = save_sender_address;
1290
1291 return local_identity;
1292 }
1293
1294
1295
1296 /* This routine is a callback that is called from transport_check_waiting.
1297 This function will evaluate the incoming message versus the previous
1298 message. If the incoming message is using a different local identity then
1299 we will veto this new message. */
1300
1301 static BOOL
1302 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1303 {
1304 uschar * message_local_identity,
1305 * current_local_identity,
1306 * new_sender_address;
1307
1308 current_local_identity =
1309 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1310
1311 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1312 return 0;
1313
1314 message_local_identity =
1315 smtp_local_identity(new_sender_address, s_compare->tblock);
1316
1317 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1318 }
1319
1320
1321
1322 uschar
1323 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1324 {
1325 #ifdef SUPPORT_TLS
1326 if ( checks & PEER_OFFERED_TLS
1327 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1328 checks &= ~PEER_OFFERED_TLS;
1329 #endif
1330
1331 if ( checks & PEER_OFFERED_IGNQ
1332 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_IGNQ;
1335
1336 if ( checks & PEER_OFFERED_CHUNKING
1337 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_CHUNKING;
1339
1340 #ifndef DISABLE_PRDR
1341 if ( checks & PEER_OFFERED_PRDR
1342 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1343 checks &= ~PEER_OFFERED_PRDR;
1344 #endif
1345
1346 #ifdef SUPPORT_I18N
1347 if ( checks & PEER_OFFERED_UTF8
1348 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_UTF8;
1350 #endif
1351
1352 if ( checks & PEER_OFFERED_DSN
1353 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_DSN;
1355
1356 if ( checks & PEER_OFFERED_PIPE
1357 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1358 PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~PEER_OFFERED_PIPE;
1360
1361 if ( checks & PEER_OFFERED_SIZE
1362 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1363 checks &= ~PEER_OFFERED_SIZE;
1364
1365 return checks;
1366 }
1367
1368
1369
1370 /* Callback for emitting a BDAT data chunk header.
1371
1372 If given a nonzero size, first flush any buffered SMTP commands
1373 then emit the command.
1374
1375 Reap previous SMTP command responses if requested.
1376 Reap one SMTP command response if requested.
1377
1378 Returns: OK or ERROR
1379 */
1380
1381 static int
1382 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1383 unsigned chunk_size, unsigned flags)
1384 {
1385 smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 int cmd_count = 0;
1388 int prev_cmd_count;
1389 uschar * buffer = tctx->buffer;
1390
1391
1392 /* Write SMTP chunk header command */
1393
1394 if (chunk_size > 0)
1395 {
1396 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1397 chunk_size,
1398 flags & tc_chunk_last ? " LAST" : "")
1399 ) < 0) return ERROR;
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1402 }
1403
1404 prev_cmd_count = cmd_count += tctx->cmd_count;
1405
1406 /* Reap responses for any previous, but not one we just emitted */
1407
1408 if (chunk_size > 0)
1409 prev_cmd_count--;
1410 if (tctx->pending_BDAT)
1411 prev_cmd_count--;
1412
1413 if (flags & tc_reap_prev && prev_cmd_count > 0)
1414 {
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
1417
1418 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1419 tctx->sync_addr, tctx->host, prev_cmd_count,
1420 ob->address_retry_include_sender,
1421 tctx->pending_MAIL, 0,
1422 tctx->inblock,
1423 ob->command_timeout,
1424 buffer, DELIVER_BUFFER_SIZE))
1425 {
1426 case 1: /* 2xx (only) => OK */
1427 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1428 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1429 case 0: break; /* No 2xx or 5xx, but no probs */
1430
1431 case -1: /* Timeout on RCPT */
1432 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1433 }
1434 cmd_count = 1;
1435 if (!tctx->pending_BDAT)
1436 pipelining_active = FALSE;
1437 }
1438
1439 /* Reap response for an outstanding BDAT */
1440
1441 if (tctx->pending_BDAT)
1442 {
1443 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1444
1445 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1446 ob->command_timeout))
1447 {
1448 if (errno == 0 && buffer[0] == '4')
1449 {
1450 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1451 tctx->first_addr->more_errno |=
1452 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1453 }
1454 return ERROR;
1455 }
1456 cmd_count--;
1457 tctx->pending_BDAT = FALSE;
1458 pipelining_active = FALSE;
1459 }
1460 else if (chunk_size > 0)
1461 tctx->pending_BDAT = TRUE;
1462
1463
1464 tctx->cmd_count = cmd_count;
1465 return OK;
1466 }
1467
1468
1469
1470 /*************************************************
1471 * Make connection for given message *
1472 *************************************************/
1473
1474 typedef struct {
1475 address_item * addrlist;
1476 host_item * host;
1477 int host_af;
1478 int port;
1479 uschar * interface;
1480
1481 BOOL lmtp:1;
1482 BOOL smtps:1;
1483 BOOL ok:1;
1484 BOOL send_rset:1;
1485 BOOL send_quit:1;
1486 BOOL setting_up:1;
1487 BOOL esmtp:1;
1488 BOOL esmtp_sent:1;
1489 BOOL pending_MAIL:1;
1490 #ifndef DISABLE_PRDR
1491 BOOL prdr_active:1;
1492 #endif
1493 #ifdef SUPPORT_I18N
1494 BOOL utf8_needed:1;
1495 #endif
1496 BOOL dsn_all_lasthop:1;
1497 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1498 BOOL dane:1;
1499 BOOL dane_required:1;
1500 #endif
1501
1502 int max_rcpt;
1503
1504 uschar peer_offered;
1505 uschar * igquotstr;
1506 uschar * helo_data;
1507 #ifdef EXPERIMENTAL_DSN_INFO
1508 uschar * smtp_greeting;
1509 uschar * helo_response;
1510 #endif
1511
1512 smtp_inblock inblock;
1513 smtp_outblock outblock;
1514 uschar buffer[DELIVER_BUFFER_SIZE];
1515 uschar inbuffer[4096];
1516 uschar outbuffer[4096];
1517
1518 transport_instance * tblock;
1519 smtp_transport_options_block * ob;
1520 } smtp_context;
1521
1522 /*
1523 Arguments:
1524 ctx connection context
1525 message_defer return set TRUE if yield is OK, but all addresses were deferred
1526 because of a non-recipient, non-host failure, that is, a
1527 4xx response to MAIL FROM, DATA, or ".". This is a defer
1528 that is specific to the message.
1529 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1530 a second attempt after TLS initialization fails
1531 verify TRUE if connection is for a verify callout, FALSE for
1532 a delivery attempt
1533
1534 Returns: OK - the connection was made and the delivery attempted;
1535 fd is set in the conn context, tls_out set up.
1536 DEFER - the connection could not be made, or something failed
1537 while setting up the SMTP session, or there was a
1538 non-message-specific error, such as a timeout.
1539 ERROR - helo_data or add_headers or authenticated_sender is
1540 specified for this transport, and the string failed
1541 to expand
1542 */
1543 int
1544 smtp_setup_conn(smtp_context * sx, BOOL * message_defer, BOOL suppress_tls,
1545 BOOL verify)
1546 {
1547 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1548 dns_answer tlsa_dnsa;
1549 #endif
1550 BOOL pass_message = FALSE;
1551
1552 uschar * message = NULL;
1553 int save_errno;
1554 int yield = OK;
1555 int rc;
1556
1557 sx->ob = (smtp_transport_options_block *)(sx->tblock->options_block);
1558
1559 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1560 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1561 sx->ok = FALSE;
1562 sx->send_rset = TRUE;
1563 sx->send_quit = TRUE;
1564 sx->setting_up = TRUE;
1565 sx->esmtp = TRUE;
1566 sx->esmtp_sent = FALSE;
1567 #ifdef SUPPORT_I18N
1568 sx->utf8_needed = FALSE;
1569 #endif
1570 sx->dsn_all_lasthop = TRUE;
1571 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1572 sx->dane = FALSE;
1573 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1574 #endif
1575
1576 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1577 sx->helo_data = NULL;
1578 sx->peer_offered = 0;
1579 sx->igquotstr = US"";
1580 #ifdef EXPERIMENTAL_DSN_INFO
1581 sx->smtp_greeting = NULL;
1582 sx->helo_response = NULL;
1583 #endif
1584
1585 *message_defer = FALSE;
1586 smtp_command = US"initial connection";
1587 sx->buffer[0] = '\0';
1588
1589 /* Set up the buffer for reading SMTP response packets. */
1590
1591 sx->inblock.buffer = sx->inbuffer;
1592 sx->inblock.buffersize = sizeof(sx->inbuffer);
1593 sx->inblock.ptr = sx->inbuffer;
1594 sx->inblock.ptrend = sx->inbuffer;
1595
1596 /* Set up the buffer for holding SMTP commands while pipelining */
1597
1598 sx->outblock.buffer = sx->outbuffer;
1599 sx->outblock.buffersize = sizeof(sx->outbuffer);
1600 sx->outblock.ptr = sx->outbuffer;
1601 sx->outblock.cmd_count = 0;
1602 sx->outblock.authenticating = FALSE;
1603
1604 /* Reset the parameters of a TLS session. */
1605
1606 tls_out.bits = 0;
1607 tls_out.cipher = NULL; /* the one we may use for this transport */
1608 tls_out.ourcert = NULL;
1609 tls_out.peercert = NULL;
1610 tls_out.peerdn = NULL;
1611 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1612 tls_out.sni = NULL;
1613 #endif
1614 tls_out.ocsp = OCSP_NOT_REQ;
1615
1616 /* Flip the legacy TLS-related variables over to the outbound set in case
1617 they're used in the context of the transport. Don't bother resetting
1618 afterward as we're in a subprocess. */
1619
1620 tls_modify_variables(&tls_out);
1621
1622 #ifndef SUPPORT_TLS
1623 if (sx->smtps)
1624 {
1625 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1626 DEFER, FALSE);
1627 return ERROR;
1628 }
1629 #endif
1630
1631 /* Make a connection to the host if this isn't a continued delivery, and handle
1632 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1633 specially so they can be identified for retries. */
1634
1635 if (continue_hostname == NULL)
1636 {
1637 /* This puts port into host->port */
1638 sx->inblock.sock = sx->outblock.sock =
1639 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1640 sx->ob->connect_timeout, sx->tblock);
1641
1642 if (sx->inblock.sock < 0)
1643 {
1644 set_errno_nohost(sx->addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1645 NULL, DEFER, FALSE);
1646 return DEFER;
1647 }
1648
1649 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1650 {
1651 tls_out.dane_verified = FALSE;
1652 tls_out.tlsa_usage = 0;
1653
1654 if (sx->host->dnssec == DS_YES)
1655 {
1656 if( sx->dane_required
1657 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1658 )
1659 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1660 {
1661 case OK: sx->dane = TRUE; break;
1662 case FAIL_FORCED: break;
1663 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1664 string_sprintf("DANE error: tlsa lookup %s",
1665 rc == DEFER ? "DEFER" : "FAIL"),
1666 rc, FALSE);
1667 return rc;
1668 }
1669 }
1670 else if (sx->dane_required)
1671 {
1672 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1673 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1674 FAIL, FALSE);
1675 return FAIL;
1676 }
1677
1678 if (sx->dane)
1679 sx->ob->tls_tempfail_tryclear = FALSE;
1680 }
1681 #endif /*DANE*/
1682
1683 /* Expand the greeting message while waiting for the initial response. (Makes
1684 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1685 delayed till here so that $sending_interface and $sending_port are set. */
1686
1687 sx->helo_data = expand_string(sx->ob->helo_data);
1688 #ifdef SUPPORT_I18N
1689 if (sx->helo_data)
1690 {
1691 uschar * errstr = NULL;
1692 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data, &errstr)), errstr)
1693 {
1694 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1695 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1696 yield = DEFER;
1697 goto SEND_QUIT;
1698 }
1699 }
1700 #endif
1701
1702 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1703 is nevertheless a reasonably clean way of programming this kind of logic,
1704 where you want to escape on any error. */
1705
1706 if (!sx->smtps)
1707 {
1708 BOOL good_response;
1709
1710 #ifdef TCP_QUICKACK
1711 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1712 #endif
1713 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1714 '2', sx->ob->command_timeout);
1715 #ifdef EXPERIMENTAL_DSN_INFO
1716 sx->smtp_greeting = string_copy(sx->buffer);
1717 #endif
1718 if (!good_response) goto RESPONSE_FAILED;
1719
1720 #ifndef DISABLE_EVENT
1721 {
1722 uschar * s;
1723 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1724 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1725 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1726 if (s)
1727 {
1728 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1729 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1730 DEFER, FALSE);
1731 yield = DEFER;
1732 goto SEND_QUIT;
1733 }
1734 }
1735 #endif
1736
1737 /* Now check if the helo_data expansion went well, and sign off cleanly if
1738 it didn't. */
1739
1740 if (!sx->helo_data)
1741 {
1742 message = string_sprintf("failed to expand helo_data: %s",
1743 expand_string_message);
1744 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1745 yield = DEFER;
1746 goto SEND_QUIT;
1747 }
1748 }
1749
1750 /** Debugging without sending a message
1751 sx->addrlist->transport_return = DEFER;
1752 goto SEND_QUIT;
1753 **/
1754
1755 /* Errors that occur after this point follow an SMTP command, which is
1756 left in big_buffer by smtp_write_command() for use in error messages. */
1757
1758 smtp_command = big_buffer;
1759
1760 /* Tell the remote who we are...
1761
1762 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1763 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1764 greeting is of this form. The assumption was that the far end supports it
1765 properly... but experience shows that there are some that give 5xx responses,
1766 even though the banner includes "ESMTP" (there's a bloody-minded one that
1767 says "ESMTP not spoken here"). Cope with that case.
1768
1769 September 2000: Time has passed, and it seems reasonable now to always send
1770 EHLO at the start. It is also convenient to make the change while installing
1771 the TLS stuff.
1772
1773 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1774 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1775 would be no way to send out the mails, so there is now a host list
1776 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1777 PIPELINING problem as well. Maybe it can also be useful to cure other
1778 problems with broken servers.
1779
1780 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1781 Then somebody tried it with a Microsoft mailer... It seems that all other
1782 mailers use upper case for some reason (the RFC is quite clear about case
1783 independence) so, for peace of mind, I gave in. */
1784
1785 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1786
1787 /* Alas; be careful, since this goto is not an error-out, so conceivably
1788 we might set data between here and the target which we assume to exist
1789 and be usable. I can see this coming back to bite us. */
1790 #ifdef SUPPORT_TLS
1791 if (sx->smtps)
1792 {
1793 smtp_peer_options |= PEER_OFFERED_TLS;
1794 suppress_tls = FALSE;
1795 sx->ob->tls_tempfail_tryclear = FALSE;
1796 smtp_command = US"SSL-on-connect";
1797 goto TLS_NEGOTIATE;
1798 }
1799 #endif
1800
1801 if (sx->esmtp)
1802 {
1803 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1804 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1805 goto SEND_FAILED;
1806 sx->esmtp_sent = TRUE;
1807 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1808 sx->ob->command_timeout))
1809 {
1810 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1811 {
1812 #ifdef EXPERIMENTAL_DSN_INFO
1813 sx->helo_response = string_copy(sx->buffer);
1814 #endif
1815 goto RESPONSE_FAILED;
1816 }
1817 sx->esmtp = FALSE;
1818 }
1819 #ifdef EXPERIMENTAL_DSN_INFO
1820 sx->helo_response = string_copy(sx->buffer);
1821 #endif
1822 }
1823 else
1824 DEBUG(D_transport)
1825 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1826
1827 if (!sx->esmtp)
1828 {
1829 BOOL good_response;
1830 int n = sizeof(sx->buffer);
1831 uschar * rsp = sx->buffer;
1832
1833 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1834 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1835
1836 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1837 goto SEND_FAILED;
1838 good_response = smtp_read_response(&sx->inblock, rsp, n,
1839 '2', sx->ob->command_timeout);
1840 #ifdef EXPERIMENTAL_DSN_INFO
1841 sx->helo_response = string_copy(rsp);
1842 #endif
1843 if (!good_response)
1844 {
1845 /* Handle special logging for a closed connection after HELO
1846 when had previously sent EHLO */
1847
1848 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1849 {
1850 sx->send_quit = FALSE;
1851 save_errno = ERRNO_SMTPCLOSED;
1852 message = string_sprintf("Remote host closed connection "
1853 "in response to %s (EHLO response was: %s)",
1854 smtp_command, sx->buffer);
1855 goto FAILED;
1856 }
1857 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1858 goto RESPONSE_FAILED;
1859 }
1860 }
1861
1862 sx->peer_offered = smtp_peer_options = 0;
1863
1864 if (sx->esmtp || sx->lmtp)
1865 {
1866 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
1867 PEER_OFFERED_TLS /* others checked later */
1868 );
1869
1870 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1871
1872 #ifdef SUPPORT_TLS
1873 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1874 #endif
1875 }
1876 }
1877
1878 /* For continuing deliveries down the same channel, the socket is the standard
1879 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1880 below). Set up the pointer to where subsequent commands will be left, for
1881 error messages. Note that smtp_peer_options will have been
1882 set from the command line if they were set in the process that passed the
1883 connection on. */
1884
1885 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1886 as the continue goes via transport_pass_socket() and doublefork and exec.
1887 It does not wait. Unclear how we keep separate host's responses
1888 separate - we could match up by host ip+port as a bodge. */
1889
1890 else
1891 {
1892 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1893 smtp_command = big_buffer;
1894 sx->host->port = sx->port; /* Record the port that was used */
1895 }
1896
1897 /* If TLS is available on this connection, whether continued or not, attempt to
1898 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1899 send another EHLO - the server may give a different answer in secure mode. We
1900 use a separate buffer for reading the response to STARTTLS so that if it is
1901 negative, the original EHLO data is available for subsequent analysis, should
1902 the client not be required to use TLS. If the response is bad, copy the buffer
1903 for error analysis. */
1904
1905 #ifdef SUPPORT_TLS
1906 if ( smtp_peer_options & PEER_OFFERED_TLS
1907 && !suppress_tls
1908 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK)
1909 {
1910 uschar buffer2[4096];
1911 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1912 goto SEND_FAILED;
1913
1914 /* If there is an I/O error, transmission of this message is deferred. If
1915 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1916 false, we also defer. However, if there is a temporary rejection of STARTTLS
1917 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1918 STARTTLS, we carry on. This means we will try to send the message in clear,
1919 unless the host is in hosts_require_tls (tested below). */
1920
1921 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1922 sx->ob->command_timeout))
1923 {
1924 if ( errno != 0
1925 || buffer2[0] == 0
1926 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1927 )
1928 {
1929 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1930 goto RESPONSE_FAILED;
1931 }
1932 }
1933
1934 /* STARTTLS accepted: try to negotiate a TLS session. */
1935
1936 else
1937 TLS_NEGOTIATE:
1938 {
1939 address_item * addr;
1940 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1941 # ifdef EXPERIMENTAL_DANE
1942 , sx->dane ? &tlsa_dnsa : NULL
1943 # endif
1944 );
1945
1946 /* TLS negotiation failed; give an error. From outside, this function may
1947 be called again to try in clear on a new connection, if the options permit
1948 it for this host. */
1949
1950 if (rc != OK)
1951 {
1952 # ifdef EXPERIMENTAL_DANE
1953 if (sx->dane) log_write(0, LOG_MAIN,
1954 "DANE attempt failed; no TLS connection to %s [%s]",
1955 sx->host->name, sx->host->address);
1956 # endif
1957
1958 save_errno = ERRNO_TLSFAILURE;
1959 message = US"failure while setting up TLS session";
1960 sx->send_quit = FALSE;
1961 goto TLS_FAILED;
1962 }
1963
1964 /* TLS session is set up */
1965
1966 smtp_peer_options_wrap = smtp_peer_options;
1967 for (addr = sx->addrlist; addr; addr = addr->next)
1968 if (addr->transport_return == PENDING_DEFER)
1969 {
1970 addr->cipher = tls_out.cipher;
1971 addr->ourcert = tls_out.ourcert;
1972 addr->peercert = tls_out.peercert;
1973 addr->peerdn = tls_out.peerdn;
1974 addr->ocsp = tls_out.ocsp;
1975 }
1976 }
1977 }
1978
1979 /* if smtps, we'll have smtp_command set to something else; always safe to
1980 reset it here. */
1981 smtp_command = big_buffer;
1982
1983 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1984 helo_data is null, we are dealing with a connection that was passed from
1985 another process, and so we won't have expanded helo_data above. We have to
1986 expand it here. $sending_ip_address and $sending_port are set up right at the
1987 start of the Exim process (in exim.c). */
1988
1989 if (tls_out.active >= 0)
1990 {
1991 char *greeting_cmd;
1992 BOOL good_response;
1993
1994 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1995 {
1996 uschar *message = string_sprintf("failed to expand helo_data: %s",
1997 expand_string_message);
1998 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1999 yield = DEFER;
2000 goto SEND_QUIT;
2001 }
2002
2003 /* For SMTPS we need to wait for the initial OK response. */
2004 if (sx->smtps)
2005 {
2006 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2007 '2', sx->ob->command_timeout);
2008 #ifdef EXPERIMENTAL_DSN_INFO
2009 sx->smtp_greeting = string_copy(sx->buffer);
2010 #endif
2011 if (!good_response) goto RESPONSE_FAILED;
2012 }
2013
2014 if (sx->esmtp)
2015 greeting_cmd = "EHLO";
2016 else
2017 {
2018 greeting_cmd = "HELO";
2019 DEBUG(D_transport)
2020 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2021 }
2022
2023 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
2024 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2025 goto SEND_FAILED;
2026 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2027 '2', sx->ob->command_timeout);
2028 #ifdef EXPERIMENTAL_DSN_INFO
2029 sx->helo_response = string_copy(sx->buffer);
2030 #endif
2031 if (!good_response) goto RESPONSE_FAILED;
2032 smtp_peer_options = 0;
2033 }
2034
2035 /* If the host is required to use a secure channel, ensure that we
2036 have one. */
2037
2038 else if ( sx->smtps
2039 # ifdef EXPERIMENTAL_DANE
2040 || sx->dane
2041 # endif
2042 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2043 )
2044 {
2045 save_errno = ERRNO_TLSREQUIRED;
2046 message = string_sprintf("a TLS session is required, but %s",
2047 smtp_peer_options & PEER_OFFERED_TLS
2048 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2049 goto TLS_FAILED;
2050 }
2051 #endif /*SUPPORT_TLS*/
2052
2053 /* If TLS is active, we have just started it up and re-done the EHLO command,
2054 so its response needs to be analyzed. If TLS is not active and this is a
2055 continued session down a previously-used socket, we haven't just done EHLO, so
2056 we skip this. */
2057
2058 if (continue_hostname == NULL
2059 #ifdef SUPPORT_TLS
2060 || tls_out.active >= 0
2061 #endif
2062 )
2063 {
2064 if (sx->esmtp || sx->lmtp)
2065 {
2066 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2067 0 /* no TLS */
2068 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2069 | PEER_OFFERED_CHUNKING
2070 | PEER_OFFERED_PRDR
2071 #ifdef SUPPORT_I18N
2072 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2073 /*XXX if we hand peercaps on to continued-conn processes,
2074 must not depend on this addr */
2075 #endif
2076 | PEER_OFFERED_DSN
2077 | PEER_OFFERED_PIPE
2078 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2079 );
2080
2081 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2082 lmtp_ignore_quota option was set. */
2083
2084 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2085
2086 /* If the response to EHLO specified support for the SIZE parameter, note
2087 this, provided size_addition is non-negative. */
2088
2089 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2090
2091 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2092 the current host, esmtp will be false, so PIPELINING can never be used. If
2093 the current host matches hosts_avoid_pipelining, don't do it. */
2094
2095 if ( sx->peer_offered & PEER_OFFERED_PIPE
2096 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2097 smtp_peer_options |= PEER_OFFERED_PIPE;
2098
2099 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2100 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2101
2102 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2103 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2104 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2105
2106 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2107 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2108
2109 #ifndef DISABLE_PRDR
2110 if ( sx->peer_offered & PEER_OFFERED_PRDR
2111 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2112 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2113
2114 if (sx->peer_offered & PEER_OFFERED_PRDR)
2115 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2116 #endif
2117
2118 /* Note if the server supports DSN */
2119 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2120 DEBUG(D_transport) debug_printf("%susing DSN\n",
2121 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2122
2123 /* Note if the response to EHLO specifies support for the AUTH extension.
2124 If it has, check that this host is one we want to authenticate to, and do
2125 the business. The host name and address must be available when the
2126 authenticator's client driver is running. */
2127
2128 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2129 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2130 {
2131 default: goto SEND_QUIT;
2132 case OK: break;
2133 case FAIL_SEND: goto SEND_FAILED;
2134 case FAIL: goto RESPONSE_FAILED;
2135 }
2136 }
2137 }
2138 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2139
2140 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2141 message-specific. */
2142
2143 sx->setting_up = FALSE;
2144
2145 #ifdef SUPPORT_I18N
2146 if (sx->addrlist->prop.utf8_msg)
2147 {
2148 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2149 && !sx->addrlist->prop.utf8_downcvt_maybe;
2150 DEBUG(D_transport) if (!sx->utf8_needed)
2151 debug_printf("utf8: %s downconvert\n",
2152 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2153 }
2154
2155 /* If this is an international message we need the host to speak SMTPUTF8 */
2156 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2157 {
2158 errno = ERRNO_UTF8_FWD;
2159 goto RESPONSE_FAILED;
2160 }
2161 #endif
2162
2163 return OK;
2164
2165
2166 {
2167 int code;
2168 uschar * set_message;
2169
2170 RESPONSE_FAILED:
2171 {
2172 save_errno = errno;
2173 message = NULL;
2174 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2175 sx->buffer, &code, &message, &pass_message);
2176 goto FAILED;
2177 }
2178
2179 SEND_FAILED:
2180 {
2181 save_errno = errno;
2182 code = '4';
2183 message = US string_sprintf("send() to %s [%s] failed: %s",
2184 sx->host->name, sx->host->address, strerror(save_errno));
2185 sx->send_quit = FALSE;
2186 goto FAILED;
2187 }
2188
2189 /* This label is jumped to directly when a TLS negotiation has failed,
2190 or was not done for a host for which it is required. Values will be set
2191 in message and save_errno, and setting_up will always be true. Treat as
2192 a temporary error. */
2193
2194 #ifdef SUPPORT_TLS
2195 TLS_FAILED:
2196 code = '4';
2197 #endif
2198
2199 /* The failure happened while setting up the call; see if the failure was
2200 a 5xx response (this will either be on connection, or following HELO - a 5xx
2201 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2202 never going to accept them. For other errors during setting up (timeouts or
2203 whatever), defer all addresses, and yield DEFER, so that the host is not
2204 tried again for a while. */
2205
2206 FAILED:
2207 sx->ok = FALSE; /* For when reached by GOTO */
2208 set_message = message;
2209
2210 yield = code == '5'
2211 #ifdef SUPPORT_I18N
2212 || errno == ERRNO_UTF8_FWD
2213 #endif
2214 ? FAIL : DEFER;
2215
2216 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2217 #ifdef EXPERIMENTAL_DSN_INFO
2218 , sx->smtp_greeting, sx->helo_response
2219 #endif
2220 );
2221 }
2222
2223
2224 SEND_QUIT:
2225
2226 if (sx->send_quit)
2227 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2228
2229 /*END_OFF:*/
2230
2231 #ifdef SUPPORT_TLS
2232 tls_close(FALSE, TRUE);
2233 #endif
2234
2235 /* Close the socket, and return the appropriate value, first setting
2236 works because the NULL setting is passed back to the calling process, and
2237 remote_max_parallel is forced to 1 when delivering over an existing connection,
2238
2239 If all went well and continue_more is set, we shouldn't actually get here if
2240 there are further addresses, as the return above will be taken. However,
2241 writing RSET might have failed, or there may be other addresses whose hosts are
2242 specified in the transports, and therefore not visible at top level, in which
2243 case continue_more won't get set. */
2244
2245 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2246 if (sx->send_quit)
2247 {
2248 shutdown(sx->outblock.sock, SHUT_WR);
2249 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2250 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2251 rc--; /* drain socket */
2252 }
2253 (void)close(sx->inblock.sock);
2254
2255 #ifndef DISABLE_EVENT
2256 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2257 #endif
2258
2259 continue_transport = NULL;
2260 continue_hostname = NULL;
2261 return yield;
2262 }
2263
2264
2265 /*************************************************
2266 * Deliver address list to given host *
2267 *************************************************/
2268
2269 /* If continue_hostname is not null, we get here only when continuing to
2270 deliver down an existing channel. The channel was passed as the standard
2271 input. TLS is never active on a passed channel; the previous process always
2272 closes it down before passing the connection on.
2273
2274 Otherwise, we have to make a connection to the remote host, and do the
2275 initial protocol exchange.
2276
2277 When running as an MUA wrapper, if the sender or any recipient is rejected,
2278 temporarily or permanently, we force failure for all recipients.
2279
2280 Arguments:
2281 addrlist chain of potential addresses to deliver; only those whose
2282 transport_return field is set to PENDING_DEFER are currently
2283 being processed; others should be skipped - they have either
2284 been delivered to an earlier host or IP address, or been
2285 failed by one of them.
2286 host host to deliver to
2287 host_af AF_INET or AF_INET6
2288 port default TCP/IP port to use, in host byte order
2289 interface interface to bind to, or NULL
2290 tblock transport instance block
2291 message_defer set TRUE if yield is OK, but all addresses were deferred
2292 because of a non-recipient, non-host failure, that is, a
2293 4xx response to MAIL FROM, DATA, or ".". This is a defer
2294 that is specific to the message.
2295 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2296 a second attempt after TLS initialization fails
2297
2298 Returns: OK - the connection was made and the delivery attempted;
2299 the result for each address is in its data block.
2300 DEFER - the connection could not be made, or something failed
2301 while setting up the SMTP session, or there was a
2302 non-message-specific error, such as a timeout.
2303 ERROR - a filter command is specified for this transport,
2304 and there was a problem setting it up; OR helo_data
2305 or add_headers or authenticated_sender is specified
2306 for this transport, and the string failed to expand
2307 */
2308
2309 static int
2310 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2311 uschar *interface, transport_instance *tblock,
2312 BOOL *message_defer, BOOL suppress_tls)
2313 {
2314 address_item *addr;
2315 address_item *sync_addr;
2316 address_item *first_addr = addrlist;
2317 int yield = OK;
2318 int address_count;
2319 int save_errno;
2320 int rc;
2321 time_t start_delivery_time = time(NULL);
2322
2323 BOOL completed_address = FALSE;
2324
2325
2326 BOOL pass_message = FALSE;
2327 uschar *message = NULL;
2328 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2329 uschar *p;
2330
2331 smtp_context sx;
2332
2333 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2334
2335 sx.addrlist = addrlist;
2336 sx.host = host;
2337 sx.host_af = host_af,
2338 sx.port = port;
2339 sx.interface = interface;
2340 sx.tblock = tblock;
2341
2342 if ((rc = smtp_setup_conn(&sx, message_defer, suppress_tls, FALSE)) != OK)
2343 return rc;
2344
2345 /* If there is a filter command specified for this transport, we can now
2346 set it up. This cannot be done until the identify of the host is known. */
2347
2348 if (tblock->filter_command != NULL)
2349 {
2350 BOOL rc;
2351 uschar fbuf[64];
2352 sprintf(CS fbuf, "%.50s transport", tblock->name);
2353 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2354 TRUE, DEFER, addrlist, fbuf, NULL);
2355 transport_filter_timeout = tblock->filter_timeout;
2356
2357 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2358 yield ERROR. */
2359
2360 if (!rc)
2361 {
2362 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2363 FALSE);
2364 yield = ERROR;
2365 goto SEND_QUIT;
2366 }
2367
2368 if ( transport_filter_argv
2369 && *transport_filter_argv
2370 && **transport_filter_argv
2371 && sx.peer_offered & PEER_OFFERED_CHUNKING
2372 )
2373 {
2374 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2375 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2376 }
2377 }
2378
2379
2380 /* For messages that have more than the maximum number of envelope recipients,
2381 we want to send several transactions down the same SMTP connection. (See
2382 comments in deliver.c as to how this reconciles, heuristically, with
2383 remote_max_parallel.) This optimization was added to Exim after the following
2384 code was already working. The simplest way to put it in without disturbing the
2385 code was to use a goto to jump back to this point when there is another
2386 transaction to handle. */
2387
2388 SEND_MESSAGE:
2389 sync_addr = first_addr;
2390 sx.ok = FALSE;
2391 sx.send_rset = TRUE;
2392 completed_address = FALSE;
2393
2394
2395 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2396 qualification, send it, adding something to the message size to allow for
2397 imprecision and things that get added en route. Exim keeps the number of lines
2398 in a message, so we can give an accurate value for the original message, but we
2399 need some additional to handle added headers. (Double "." characters don't get
2400 included in the count.) */
2401
2402 p = sx.buffer;
2403 *p = 0;
2404
2405 if (sx.peer_offered & PEER_OFFERED_SIZE)
2406 {
2407 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx.ob->size_addition);
2408 while (*p) p++;
2409 }
2410
2411 #ifndef DISABLE_PRDR
2412 sx.prdr_active = FALSE;
2413 if (sx.peer_offered & PEER_OFFERED_PRDR)
2414 for (addr = first_addr; addr; addr = addr->next)
2415 if (addr->transport_return == PENDING_DEFER)
2416 {
2417 for (addr = addr->next; addr; addr = addr->next)
2418 if (addr->transport_return == PENDING_DEFER)
2419 { /* at least two recipients to send */
2420 sx.prdr_active = TRUE;
2421 sprintf(CS p, " PRDR"); p += 5;
2422 break;
2423 }
2424 break;
2425 }
2426 #endif
2427
2428 #ifdef SUPPORT_I18N
2429 if ( addrlist->prop.utf8_msg
2430 && !addrlist->prop.utf8_downcvt
2431 && sx.peer_offered & PEER_OFFERED_UTF8
2432 )
2433 sprintf(CS p, " SMTPUTF8"), p += 9;
2434 #endif
2435
2436 /* check if all addresses have lasthop flag; do not send RET and ENVID if so */
2437 for (sx.dsn_all_lasthop = TRUE, addr = first_addr, address_count = 0;
2438 addr && address_count < sx.max_rcpt;
2439 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2440 {
2441 address_count++;
2442 if (!(addr->dsn_flags & rf_dsnlasthop))
2443 {
2444 sx.dsn_all_lasthop = FALSE;
2445 break;
2446 }
2447 }
2448
2449 /* Add any DSN flags to the mail command */
2450
2451 if (sx.peer_offered & PEER_OFFERED_DSN && !sx.dsn_all_lasthop)
2452 {
2453 if (dsn_ret == dsn_ret_hdrs)
2454 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2455 else if (dsn_ret == dsn_ret_full)
2456 { Ustrcpy(p, " RET=FULL"); p += 9; }
2457
2458 if (dsn_envid)
2459 {
2460 string_format(p, sizeof(sx.buffer) - (p-sx.buffer), " ENVID=%s", dsn_envid);
2461 while (*p) p++;
2462 }
2463 }
2464
2465 /* If an authenticated_sender override has been specified for this transport
2466 instance, expand it. If the expansion is forced to fail, and there was already
2467 an authenticated_sender for this message, the original value will be used.
2468 Other expansion failures are serious. An empty result is ignored, but there is
2469 otherwise no check - this feature is expected to be used with LMTP and other
2470 cases where non-standard addresses (e.g. without domains) might be required. */
2471
2472 if (smtp_mail_auth_str(p, sizeof(sx.buffer) - (p-sx.buffer), addrlist, sx.ob))
2473 {
2474 yield = ERROR;
2475 goto SEND_QUIT;
2476 }
2477
2478 /* From here until we send the DATA command, we can make use of PIPELINING
2479 if the server host supports it. The code has to be able to check the responses
2480 at any point, for when the buffer fills up, so we write it totally generally.
2481 When PIPELINING is off, each command written reports that it has flushed the
2482 buffer. */
2483
2484 sx.pending_MAIL = TRUE; /* The block starts with MAIL */
2485
2486 {
2487 uschar * s = return_path;
2488 #ifdef SUPPORT_I18N
2489 uschar * errstr = NULL;
2490
2491 /* If we must downconvert, do the from-address here. Remember we had to
2492 for the to-addresses (done below), and also (ugly) for re-doing when building
2493 the delivery log line. */
2494
2495 if ( addrlist->prop.utf8_msg
2496 && (addrlist->prop.utf8_downcvt || !(sx.peer_offered & PEER_OFFERED_UTF8))
2497 )
2498 {
2499 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2500 {
2501 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2502 yield = ERROR;
2503 goto SEND_QUIT;
2504 }
2505 setflag(addrlist, af_utf8_downcvt);
2506 }
2507 #endif
2508
2509 rc = smtp_write_command(&sx.outblock, pipelining_active,
2510 "MAIL FROM:<%s>%s\r\n", s, sx.buffer);
2511 }
2512
2513 mail_command = string_copy(big_buffer); /* Save for later error message */
2514
2515 switch(rc)
2516 {
2517 case -1: /* Transmission error */
2518 goto SEND_FAILED;
2519
2520 case +1: /* Block was sent */
2521 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2522 sx.ob->command_timeout))
2523 {
2524 if (errno == 0 && sx.buffer[0] == '4')
2525 {
2526 errno = ERRNO_MAIL4XX;
2527 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2528 }
2529 goto RESPONSE_FAILED;
2530 }
2531 sx.pending_MAIL = FALSE;
2532 break;
2533 }
2534
2535 /* Pass over all the relevant recipient addresses for this host, which are the
2536 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2537 several before we have to read the responses for those seen so far. This
2538 checking is done by a subroutine because it also needs to be done at the end.
2539 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2540 the next one if not all are sent.
2541
2542 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2543 last address because we want to abort if any recipients have any kind of
2544 problem, temporary or permanent. We know that all recipient addresses will have
2545 the PENDING_DEFER status, because only one attempt is ever made, and we know
2546 that max_rcpt will be large, so all addresses will be done at once. */
2547
2548 for (addr = first_addr, address_count = 0;
2549 addr && address_count < sx.max_rcpt;
2550 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2551 {
2552 int count;
2553 BOOL no_flush;
2554 uschar * rcpt_addr;
2555
2556 addr->dsn_aware = sx.peer_offered & PEER_OFFERED_DSN
2557 ? dsn_support_yes : dsn_support_no;
2558
2559 address_count++;
2560 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2561
2562 /* Add any DSN flags to the rcpt command and add to the sent string */
2563
2564 p = sx.buffer;
2565 *p = 0;
2566
2567 if (sx.peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2568 {
2569 if (addr->dsn_flags & rf_dsnflags)
2570 {
2571 int i;
2572 BOOL first = TRUE;
2573 Ustrcpy(p, " NOTIFY=");
2574 while (*p) p++;
2575 for (i = 0; i < 4; i++)
2576 if ((addr->dsn_flags & rf_list[i]) != 0)
2577 {
2578 if (!first) *p++ = ',';
2579 first = FALSE;
2580 Ustrcpy(p, rf_names[i]);
2581 while (*p) p++;
2582 }
2583 }
2584
2585 if (addr->dsn_orcpt)
2586 {
2587 string_format(p, sizeof(sx.buffer) - (p-sx.buffer), " ORCPT=%s",
2588 addr->dsn_orcpt);
2589 while (*p) p++;
2590 }
2591 }
2592
2593 /* Now send the RCPT command, and process outstanding responses when
2594 necessary. After a timeout on RCPT, we just end the function, leaving the
2595 yield as OK, because this error can often mean that there is a problem with
2596 just one address, so we don't want to delay the host. */
2597
2598 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2599
2600 #ifdef SUPPORT_I18N
2601 if ( testflag(addrlist, af_utf8_downcvt)
2602 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2603 )
2604 {
2605 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2606 errno = ERRNO_EXPANDFAIL;
2607 goto SEND_FAILED;
2608 }
2609 #endif
2610
2611 count = smtp_write_command(&sx.outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2612 rcpt_addr, sx.igquotstr, sx.buffer);
2613
2614 if (count < 0) goto SEND_FAILED;
2615 if (count > 0)
2616 {
2617 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2618 &sync_addr, host, count, sx.ob->address_retry_include_sender,
2619 sx.pending_MAIL, 0, &sx.inblock, sx.ob->command_timeout, sx.buffer,
2620 sizeof(sx.buffer)))
2621 {
2622 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2623 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2624 break;
2625
2626 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2627 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2628 case 0: /* No 2xx or 5xx, but no probs */
2629 break;
2630
2631 case -1: goto END_OFF; /* Timeout on RCPT */
2632 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2633 }
2634 sx.pending_MAIL = FALSE; /* Dealt with MAIL */
2635 }
2636 } /* Loop for next address */
2637
2638 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2639 permanently or temporarily. We should have flushed and synced after the last
2640 RCPT. */
2641
2642 if (mua_wrapper)
2643 {
2644 address_item *badaddr;
2645 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2646 if (badaddr->transport_return != PENDING_OK)
2647 {
2648 /*XXX could we find a better errno than 0 here? */
2649 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2650 testflag(badaddr, af_pass_message));
2651 sx.ok = FALSE;
2652 break;
2653 }
2654 }
2655
2656 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2657 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2658 have a good recipient buffered up if we are pipelining. We don't want to waste
2659 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2660 are pipelining. The responses are all handled by sync_responses().
2661 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2662 to send is. */
2663
2664 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2665 && (sx.ok || (pipelining_active && !mua_wrapper)))
2666 {
2667 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2668
2669 if (count < 0) goto SEND_FAILED;
2670 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2671 host, count, sx.ob->address_retry_include_sender, sx.pending_MAIL,
2672 sx.ok ? +1 : -1, &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2673 {
2674 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2675 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2676 break;
2677
2678 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2679 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2680 case 0: break; /* No 2xx or 5xx, but no probs */
2681
2682 case -1: goto END_OFF; /* Timeout on RCPT */
2683 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2684 }
2685 pipelining_active = FALSE;
2686 data_command = string_copy(big_buffer); /* Save for later error message */
2687 }
2688
2689 /* If there were no good recipients (but otherwise there have been no
2690 problems), just set ok TRUE, since we have handled address-specific errors
2691 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2692 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2693 well as body. Set the appropriate timeout value to be used for each chunk.
2694 (Haven't been able to make it work using select() for writing yet.) */
2695
2696 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2697 {
2698 /* Save the first address of the next batch. */
2699 first_addr = addr;
2700
2701 sx.ok = TRUE;
2702 }
2703 else
2704 {
2705 transport_ctx tctx = {
2706 tblock,
2707 addrlist,
2708 US".", US"..", /* Escaping strings */
2709 topt_use_crlf | topt_escape_headers
2710 | (tblock->body_only ? topt_no_headers : 0)
2711 | (tblock->headers_only ? topt_no_body : 0)
2712 | (tblock->return_path_add ? topt_add_return_path : 0)
2713 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2714 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2715 };
2716
2717 /* If using CHUNKING we need a callback from the generic transport
2718 support to us, for the sending of BDAT smtp commands and the reaping
2719 of responses. The callback needs a whole bunch of state so set up
2720 a transport-context structure to be passed around. */
2721
2722 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2723 {
2724 tctx.check_string = tctx.escape_string = NULL;
2725 tctx.options |= topt_use_bdat;
2726 tctx.chunk_cb = smtp_chunk_cmd_callback;
2727 tctx.inblock = &sx.inblock;
2728 tctx.outblock = &sx.outblock;
2729 tctx.host = host;
2730 tctx.first_addr = first_addr;
2731 tctx.sync_addr = &sync_addr;
2732 tctx.pending_MAIL = sx.pending_MAIL;
2733 tctx.pending_BDAT = FALSE;
2734 tctx.good_RCPT = sx.ok;
2735 tctx.completed_address = &completed_address;
2736 tctx.cmd_count = 0;
2737 tctx.buffer = sx.buffer;
2738 }
2739 else
2740 tctx.options |= topt_end_dot;
2741
2742 /* Save the first address of the next batch. */
2743 first_addr = addr;
2744
2745 /* Responses from CHUNKING commands go in buffer. Otherwise,
2746 there has not been a response. */
2747
2748 sx.buffer[0] = 0;
2749
2750 sigalrm_seen = FALSE;
2751 transport_write_timeout = sx.ob->data_timeout;
2752 smtp_command = US"sending data block"; /* For error messages */
2753 DEBUG(D_transport|D_v)
2754 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2755 debug_printf(" will write message using CHUNKING\n");
2756 else
2757 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2758 transport_count = 0;
2759
2760 #ifndef DISABLE_DKIM
2761 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2762 #else
2763 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2764 #endif
2765
2766 /* transport_write_message() uses write() because it is called from other
2767 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2768 it can exit with "Broken pipe" as its error. This really means that the
2769 socket got closed at the far end. */
2770
2771 transport_write_timeout = 0; /* for subsequent transports */
2772
2773 /* Failure can either be some kind of I/O disaster (including timeout),
2774 or the failure of a transport filter or the expansion of added headers.
2775 Or, when CHUNKING, it can be a protocol-detected failure. */
2776
2777 if (!sx.ok)
2778 goto RESPONSE_FAILED;
2779
2780 /* We used to send the terminating "." explicitly here, but because of
2781 buffering effects at both ends of TCP/IP connections, you don't gain
2782 anything by keeping it separate, so it might as well go in the final
2783 data buffer for efficiency. This is now done by setting the topt_end_dot
2784 flag above. */
2785
2786 smtp_command = US"end of data";
2787
2788 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2789 {
2790 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2791 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2792 host, tctx.cmd_count-1, sx.ob->address_retry_include_sender,
2793 sx.pending_MAIL, 0,
2794 &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2795 {
2796 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2797 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2798 break;
2799
2800 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2801 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2802 case 0: break; /* No 2xx or 5xx, but no probs */
2803
2804 case -1: goto END_OFF; /* Timeout on RCPT */
2805 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2806 }
2807 }
2808
2809 #ifndef DISABLE_PRDR
2810 /* For PRDR we optionally get a partial-responses warning
2811 * followed by the individual responses, before going on with
2812 * the overall response. If we don't get the warning then deal
2813 * with per non-PRDR. */
2814 if(sx.prdr_active)
2815 {
2816 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2817 sx.ob->final_timeout);
2818 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2819 {
2820 case '2': sx.prdr_active = FALSE;
2821 sx.ok = TRUE;
2822 break;
2823 case '4': errno = ERRNO_DATA4XX;
2824 addrlist->more_errno |=
2825 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2826 break;
2827 }
2828 }
2829 else
2830 #endif
2831
2832 /* For non-PRDR SMTP, we now read a single response that applies to the
2833 whole message. If it is OK, then all the addresses have been delivered. */
2834
2835 if (!sx.lmtp)
2836 {
2837 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2838 sx.ob->final_timeout);
2839 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2840 {
2841 errno = ERRNO_DATA4XX;
2842 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2843 }
2844 }
2845
2846 /* For LMTP, we get back a response for every RCPT command that we sent;
2847 some may be accepted and some rejected. For those that get a response, their
2848 status is fixed; any that are accepted have been handed over, even if later
2849 responses crash - at least, that's how I read RFC 2033.
2850
2851 If all went well, mark the recipient addresses as completed, record which
2852 host/IPaddress they were delivered to, and cut out RSET when sending another
2853 message down the same channel. Write the completed addresses to the journal
2854 now so that they are recorded in case there is a crash of hardware or
2855 software before the spool gets updated. Also record the final SMTP
2856 confirmation if needed (for SMTP only). */
2857
2858 if (sx.ok)
2859 {
2860 int flag = '=';
2861 int delivery_time = (int)(time(NULL) - start_delivery_time);
2862 int len;
2863 uschar *conf = NULL;
2864
2865 sx.send_rset = FALSE;
2866 pipelining_active = FALSE;
2867
2868 /* Set up confirmation if needed - applies only to SMTP */
2869
2870 if (
2871 #ifdef DISABLE_EVENT
2872 LOGGING(smtp_confirmation) &&
2873 #endif
2874 !sx.lmtp
2875 )
2876 {
2877 const uschar *s = string_printing(sx.buffer);
2878 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2879 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2880 }
2881
2882 /* Process all transported addresses - for LMTP or PRDR, read a status for
2883 each one. */
2884
2885 for (addr = addrlist; addr != first_addr; addr = addr->next)
2886 {
2887 if (addr->transport_return != PENDING_OK) continue;
2888
2889 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2890 remaining addresses. Otherwise, it's a return code for just the one
2891 address. For temporary errors, add a retry item for the address so that
2892 it doesn't get tried again too soon. */
2893
2894 #ifndef DISABLE_PRDR
2895 if (sx.lmtp || sx.prdr_active)
2896 #else
2897 if (sx.lmtp)
2898 #endif
2899 {
2900 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2901 sx.ob->final_timeout))
2902 {
2903 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2904 addr->message = string_sprintf(
2905 #ifndef DISABLE_PRDR
2906 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2907 #else
2908 "LMTP error after %s: %s",
2909 #endif
2910 data_command, string_printing(sx.buffer));
2911 setflag(addr, af_pass_message); /* Allow message to go to user */
2912 if (sx.buffer[0] == '5')
2913 addr->transport_return = FAIL;
2914 else
2915 {
2916 errno = ERRNO_DATA4XX;
2917 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2918 addr->transport_return = DEFER;
2919 #ifndef DISABLE_PRDR
2920 if (!sx.prdr_active)
2921 #endif
2922 retry_add_item(addr, addr->address_retry_key, 0);
2923 }
2924 continue;
2925 }
2926 completed_address = TRUE; /* NOW we can set this flag */
2927 if (LOGGING(smtp_confirmation))
2928 {
2929 const uschar *s = string_printing(sx.buffer);
2930 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2931 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2932 }
2933 }
2934
2935 /* SMTP, or success return from LMTP for this address. Pass back the
2936 actual host that was used. */
2937
2938 addr->transport_return = OK;
2939 addr->more_errno = delivery_time;
2940 addr->host_used = host;
2941 addr->special_action = flag;
2942 addr->message = conf;
2943 #ifndef DISABLE_PRDR
2944 if (sx.prdr_active) addr->flags |= af_prdr_used;
2945 #endif
2946 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2947 flag = '-';
2948
2949 #ifndef DISABLE_PRDR
2950 if (!sx.prdr_active)
2951 #endif
2952 {
2953 /* Update the journal. For homonymic addresses, use the base address plus
2954 the transport name. See lots of comments in deliver.c about the reasons
2955 for the complications when homonyms are involved. Just carry on after
2956 write error, as it may prove possible to update the spool file later. */
2957
2958 if (testflag(addr, af_homonym))
2959 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2960 else
2961 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2962
2963 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2964 len = Ustrlen(CS sx.buffer);
2965 if (write(journal_fd, sx.buffer, len) != len)
2966 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2967 "%s: %s", sx.buffer, strerror(errno));
2968 }
2969 }
2970
2971 #ifndef DISABLE_PRDR
2972 if (sx.prdr_active)
2973 {
2974 /* PRDR - get the final, overall response. For any non-success
2975 upgrade all the address statuses. */
2976 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2977 sx.ob->final_timeout);
2978 if (!sx.ok)
2979 {
2980 if(errno == 0 && sx.buffer[0] == '4')
2981 {
2982 errno = ERRNO_DATA4XX;
2983 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2984 }
2985 for (addr = addrlist; addr != first_addr; addr = addr->next)
2986 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2987 addr->transport_return = PENDING_OK; /* allow set_errno action */
2988 goto RESPONSE_FAILED;
2989 }
2990
2991 /* Update the journal, or setup retry. */
2992 for (addr = addrlist; addr != first_addr; addr = addr->next)
2993 if (addr->transport_return == OK)
2994 {
2995 if (testflag(addr, af_homonym))
2996 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2997 else
2998 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2999
3000 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3001 len = Ustrlen(CS sx.buffer);
3002 if (write(journal_fd, sx.buffer, len) != len)
3003 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3004 "%s: %s", sx.buffer, strerror(errno));
3005 }
3006 else if (addr->transport_return == DEFER)
3007 retry_add_item(addr, addr->address_retry_key, -2);
3008 }
3009 #endif
3010
3011 /* Ensure the journal file is pushed out to disk. */
3012
3013 if (EXIMfsync(journal_fd) < 0)
3014 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3015 strerror(errno));
3016 }
3017 }
3018
3019
3020 /* Handle general (not specific to one address) failures here. The value of ok
3021 is used to skip over this code on the falling through case. A timeout causes a
3022 deferral. Other errors may defer or fail according to the response code, and
3023 may set up a special errno value, e.g. after connection chopped, which is
3024 assumed if errno == 0 and there is no text in the buffer. If control reaches
3025 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3026 the problem is not related to this specific message. */
3027
3028 if (!sx.ok)
3029 {
3030 int code, set_rc;
3031 uschar * set_message;
3032
3033 RESPONSE_FAILED:
3034 {
3035 save_errno = errno;
3036 message = NULL;
3037 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3038 sx.buffer, &code, &message, &pass_message);
3039 goto FAILED;
3040 }
3041
3042 SEND_FAILED:
3043 {
3044 save_errno = errno;
3045 code = '4';
3046 message = US string_sprintf("send() to %s [%s] failed: %s",
3047 host->name, host->address, strerror(save_errno));
3048 sx.send_quit = FALSE;
3049 goto FAILED;
3050 }
3051
3052 /* This label is jumped to directly when a TLS negotiation has failed,
3053 or was not done for a host for which it is required. Values will be set
3054 in message and save_errno, and setting_up will always be true. Treat as
3055 a temporary error. */
3056
3057 #ifdef SUPPORT_TLS
3058 TLS_FAILED:
3059 code = '4';
3060 #endif
3061
3062 /* If the failure happened while setting up the call, see if the failure was
3063 a 5xx response (this will either be on connection, or following HELO - a 5xx
3064 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
3065 never going to accept them. For other errors during setting up (timeouts or
3066 whatever), defer all addresses, and yield DEFER, so that the host is not
3067 tried again for a while. */
3068
3069 FAILED:
3070 sx.ok = FALSE; /* For when reached by GOTO */
3071 set_message = message;
3072
3073 if (sx.setting_up)
3074 if (code == '5')
3075 set_rc = FAIL;
3076 else
3077 yield = set_rc = DEFER;
3078
3079 /* We want to handle timeouts after MAIL or "." and loss of connection after
3080 "." specially. They can indicate a problem with the sender address or with
3081 the contents of the message rather than a real error on the connection. These
3082 cases are treated in the same way as a 4xx response. This next bit of code
3083 does the classification. */
3084
3085 else
3086 {
3087 BOOL message_error;
3088
3089 switch(save_errno)
3090 {
3091 #ifdef SUPPORT_I18N
3092 case ERRNO_UTF8_FWD:
3093 code = '5';
3094 /*FALLTHROUGH*/
3095 #endif
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, first_addr ? "not " : "");
3206
3207 if (completed_address && 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 ( 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 (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(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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