projects / exim.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Fix error logged for send failure
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 #endif
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
95 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
98 #endif
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
101 #ifdef SUPPORT_TLS
102 # ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
105 # endif
106 # ifndef DISABLE_OCSP
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
109 # endif
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
112 #endif
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
117 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
120 #endif
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
123 #ifndef DISABLE_PRDR
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 #endif
127 #ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130 #endif
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
151 #ifdef SUPPORT_SOCKS
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154 #endif
155 #ifdef SUPPORT_TLS
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
178 #endif
179 };
180
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
183
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187 /* Default private options block for the smtp transport. */
188
189 smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
199 NULL, /* DSCP */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 US"*", /* hosts_try_chunking */
204 #ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
206 NULL, /* hosts_require_dane */
207 #endif
208 NULL, /* hosts_try_fastopen */
209 #ifndef DISABLE_PRDR
210 US"*", /* hosts_try_prdr */
211 #endif
212 #ifndef DISABLE_OCSP
213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
214 NULL, /* hosts_require_ocsp */
215 #endif
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
218 NULL, /* hosts_verify_avoid_tls */
219 NULL, /* hosts_avoid_pipelining */
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
228 50, /* hosts_max_try_hardlimit */
229 TRUE, /* address_retry_include_sender */
230 FALSE, /* allow_localhost */
231 FALSE, /* authenticated_sender_force */
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
235 { NULL, NULL }, /* dnssec_domains {request,require} */
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
240 FALSE, /* lmtp_ignore_quota */
241 NULL, /* expand_retry_include_ip_address */
242 TRUE /* retry_include_ip_address */
243 #ifdef SUPPORT_SOCKS
244 ,NULL /* socks_proxy */
245 #endif
246 #ifdef SUPPORT_TLS
247 ,NULL, /* tls_certificate */
248 NULL, /* tls_crl */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
251 NULL, /* tls_sni */
252 US"system", /* tls_verify_certificates */
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
257 US"*", /* tls_try_verify_hosts */
258 US"*" /* tls_verify_cert_hostnames */
259 #endif
260 #ifndef DISABLE_DKIM
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
268 #endif
269 };
270
271 /* some DSN flags for use later */
272
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
275
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
277
278
279
280 /* Local statics */
281
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285 static BOOL update_waiting; /* TRUE to update the "wait" database */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
287
288
289 /*************************************************
290 * Setup entry point *
291 *************************************************/
292
293 /* This function is called when the transport is about to be used,
294 but before running it in a sub-process. It is used for two things:
295
296 (1) To set the fallback host list in addresses, when delivering.
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
299
300 Arguments:
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
306 errmsg place for error message (not used)
307
308 Returns: OK always (FAIL, DEFER not used)
309 */
310
311 static int
312 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
314 {
315 smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
317
318 errmsg = errmsg; /* Keep picky compilers happy */
319 uid = uid;
320 gid = gid;
321
322 /* Pass back options if required. This interface is getting very messy. */
323
324 if (tf)
325 {
326 tf->interface = ob->interface;
327 tf->port = ob->port;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
335 tf->helo_data = ob->helo_data;
336 }
337
338 /* Set the fallback host list for all the addresses that don't have fallback
339 host lists, provided that the local host wasn't present in the original host
340 list. */
341
342 if (!testflag(addrlist, af_local_host_removed))
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
345
346 return OK;
347 }
348
349
350
351 /*************************************************
352 * Initialization entry point *
353 *************************************************/
354
355 /* Called for each instance, after its options have been read, to
356 enable consistency checks to be done, or anything else that needs
357 to be set up.
358
359 Argument: pointer to the transport instance block
360 Returns: nothing
361 */
362
363 void
364 smtp_transport_init(transport_instance *tblock)
365 {
366 smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
368
369 /* Retry_use_local_part defaults FALSE if unset */
370
371 if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
373
374 /* Set the default port according to the protocol */
375
376 if (ob->port == NULL)
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
379
380 /* Set up the setup entry point, to be called before subprocesses for this
381 transport. */
382
383 tblock->setup = smtp_transport_setup;
384
385 /* Complain if any of the timeouts are zero. */
386
387 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
391 tblock->name);
392
393 /* If hosts_override is set and there are local hosts, set the global
394 flag that stops verify from showing router hosts. */
395
396 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
397
398 /* If there are any fallback hosts listed, build a chain of host items
399 for them, but do not do any lookups at this time. */
400
401 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
402 }
403
404
405
406
407
408 /*************************************************
409 * Set delivery info into all active addresses *
410 *************************************************/
411
412 /* Only addresses whose status is >= PENDING are relevant. A lesser
413 status means that an address is not currently being processed.
414
415 Arguments:
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
421 host if set, mark addrs as having used this host
422 smtp_greeting from peer
423 helo_response from peer
424
425 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
426 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
427 this particular type of timeout.
428
429 Returns: nothing
430 */
431
432 static void
433 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
434 BOOL pass_message, host_item * host
435 #ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
437 #endif
438 )
439 {
440 address_item *addr;
441 int orvalue = 0;
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
443 {
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
446 }
447 for (addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
449 {
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
452 if (msg)
453 {
454 addr->message = msg;
455 if (pass_message) setflag(addr, af_pass_message);
456 }
457 addr->transport_return = rc;
458 if (host)
459 {
460 addr->host_used = host;
461 #ifdef EXPERIMENTAL_DSN_INFO
462 if (smtp_greeting)
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
465
466 if (helo_response)
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
469 #endif
470 }
471 }
472 }
473
474 static void
475 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
476 BOOL pass_message)
477 {
478 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , NULL, NULL
481 #endif
482 );
483 }
484
485
486 /*************************************************
487 * Check an SMTP response *
488 *************************************************/
489
490 /* This function is given an errno code and the SMTP response buffer
491 to analyse, together with the host identification for generating messages. It
492 sets an appropriate message and puts the first digit of the response code into
493 the yield variable. If no response was actually read, a suitable digit is
494 chosen.
495
496 Arguments:
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
502 message where to put an error message
503 pass_message set TRUE if message is an SMTP response
504
505 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
506 */
507
508 static BOOL
509 check_response(host_item *host, int *errno_value, int more_errno,
510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
511 {
512 uschar * pl = pipelining_active ? US"pipelined " : US"";
513 const uschar * s;
514
515 *yield = '4'; /* Default setting is to give a temporary error */
516
517 switch(*errno_value)
518 {
519 case ETIMEDOUT: /* Handle response timeout */
520 *message = US string_sprintf("SMTP timeout after %s%s",
521 pl, smtp_command);
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
524 transport_count);
525 return FALSE;
526
527 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
528 s = string_printing(buffer);
529 while (isspace(*s)) s++;
530 *message = *s == 0
531 ? string_sprintf("Malformed SMTP reply (an empty line) "
532 "in response to %s%s", pl, smtp_command)
533 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
534 pl, smtp_command, s);
535 return FALSE;
536
537 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
538 can't send QUIT as we mustn't end the DATA. */
539 *message = string_sprintf("transport filter process failed (%d)%s",
540 more_errno,
541 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
542 return FALSE;
543
544 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
545 can't send QUIT as we mustn't end the DATA. */
546 *message =
547 string_sprintf("failed to expand headers_add or headers_remove: %s",
548 expand_string_message);
549 return FALSE;
550
551 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
552 *message = string_sprintf("failed to write a data block");
553 return FALSE;
554
555 #ifdef SUPPORT_I18N
556 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
557 *message = US"utf8 support required but not offered for forwarding";
558 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
559 return TRUE;
560 #endif
561 }
562
563 /* Handle error responses from the remote mailer. */
564
565 if (buffer[0] != 0)
566 {
567 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
568 "%s", pl, smtp_command, s = string_printing(buffer));
569 *pass_message = TRUE;
570 *yield = buffer[0];
571 return TRUE;
572 }
573
574 /* No data was read. If there is no errno, this must be the EOF (i.e.
575 connection closed) case, which causes deferral. An explicit connection reset
576 error has the same effect. Otherwise, put the host's identity in the message,
577 leaving the errno value to be interpreted as well. In all cases, we have to
578 assume the connection is now dead. */
579
580 if (*errno_value == 0 || *errno_value == ECONNRESET)
581 {
582 *errno_value = ERRNO_SMTPCLOSED;
583 *message = US string_sprintf("Remote host closed connection "
584 "in response to %s%s", pl, smtp_command);
585 }
586 else
587 *message = US string_sprintf("%s [%s]", host->name, host->address);
588
589 return FALSE;
590 }
591
592
593
594 /*************************************************
595 * Write error message to logs *
596 *************************************************/
597
598 /* This writes to the main log and to the message log.
599
600 Arguments:
601 addr the address item containing error information
602 host the current host
603
604 Returns: nothing
605 */
606
607 static void
608 write_logs(address_item *addr, host_item *host)
609 {
610 uschar * message = LOGGING(outgoing_port)
611 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
612 host->port == PORT_NONE ? 25 : host->port)
613 : string_sprintf("H=%s [%s]", host->name, host->address);
614
615 if (addr->message)
616 {
617 message = string_sprintf("%s: %s", message, addr->message);
618 if (addr->basic_errno > 0)
619 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
620 log_write(0, LOG_MAIN, "%s", message);
621 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
622 }
623 else
624 {
625 const uschar * s = exim_errstr(addr->basic_errno);
626 log_write(0, LOG_MAIN, "%s %s", message, s);
627 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
628 }
629 }
630
631 static void
632 msglog_line(host_item * host, uschar * message)
633 {
634 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
635 host->name, host->address, message);
636 }
637
638
639
640 #ifndef DISABLE_EVENT
641 /*************************************************
642 * Post-defer action *
643 *************************************************/
644
645 /* This expands an arbitrary per-transport string.
646 It might, for example, be used to write to the database log.
647
648 Arguments:
649 addr the address item containing error information
650 host the current host
651
652 Returns: nothing
653 */
654
655 static void
656 deferred_event_raise(address_item *addr, host_item *host)
657 {
658 uschar * action = addr->transport->event_action;
659 const uschar * save_domain;
660 uschar * save_local;
661
662 if (!action)
663 return;
664
665 save_domain = deliver_domain;
666 save_local = deliver_localpart;
667
668 /*XXX would ip & port already be set up? */
669 deliver_host_address = string_copy(host->address);
670 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
671 event_defer_errno = addr->basic_errno;
672
673 router_name = addr->router->name;
674 transport_name = addr->transport->name;
675 deliver_domain = addr->domain;
676 deliver_localpart = addr->local_part;
677
678 (void) event_raise(action, US"msg:host:defer",
679 addr->message
680 ? addr->basic_errno > 0
681 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
682 : string_copy(addr->message)
683 : addr->basic_errno > 0
684 ? string_copy(US strerror(addr->basic_errno))
685 : NULL);
686
687 deliver_localpart = save_local;
688 deliver_domain = save_domain;
689 router_name = transport_name = NULL;
690 }
691 #endif
692
693 /*************************************************
694 * Synchronize SMTP responses *
695 *************************************************/
696
697 /* This function is called from smtp_deliver() to receive SMTP responses from
698 the server, and match them up with the commands to which they relate. When
699 PIPELINING is not in use, this function is called after every command, and is
700 therefore somewhat over-engineered, but it is simpler to use a single scheme
701 that works both with and without PIPELINING instead of having two separate sets
702 of code.
703
704 The set of commands that are buffered up with pipelining may start with MAIL
705 and may end with DATA; in between are RCPT commands that correspond to the
706 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
707 etc.) are never buffered.
708
709 Errors after MAIL or DATA abort the whole process leaving the response in the
710 buffer. After MAIL, pending responses are flushed, and the original command is
711 re-instated in big_buffer for error messages. For RCPT commands, the remote is
712 permitted to reject some recipient addresses while accepting others. However
713 certain errors clearly abort the whole process. Set the value in
714 transport_return to PENDING_OK if the address is accepted. If there is a
715 subsequent general error, it will get reset accordingly. If not, it will get
716 converted to OK at the end.
717
718 Arguments:
719 sx smtp connection context
720 count the number of responses to read
721 pending_DATA 0 if last command sent was not DATA
722 +1 if previously had a good recipient
723 -1 if not previously had a good recipient
724
725 Returns: 3 if at least one address had 2xx and one had 5xx
726 2 if at least one address had 5xx but none had 2xx
727 1 if at least one host had a 2xx response, but none had 5xx
728 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
729 -1 timeout while reading RCPT response
730 -2 I/O or other non-response error for RCPT
731 -3 DATA or MAIL failed - errno and buffer set
732 */
733
734 static int
735 sync_responses(smtp_context * sx, int count, int pending_DATA)
736 {
737 address_item *addr = sx->sync_addr;
738 smtp_transport_options_block *ob =
739 (smtp_transport_options_block *)sx->tblock->options_block;
740 int yield = 0;
741
742 /* Handle the response for a MAIL command. On error, reinstate the original
743 command in big_buffer for error message use, and flush any further pending
744 responses before returning, except after I/O errors and timeouts. */
745
746 if (sx->pending_MAIL)
747 {
748 count--;
749 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
750 '2', ob->command_timeout))
751 {
752 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
753 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
754 if (errno == 0 && sx->buffer[0] != 0)
755 {
756 uschar flushbuffer[4096];
757 int save_errno = 0;
758 if (sx->buffer[0] == '4')
759 {
760 save_errno = ERRNO_MAIL4XX;
761 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
762 }
763 while (count-- > 0)
764 {
765 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
766 '2', ob->command_timeout)
767 && (errno != 0 || flushbuffer[0] == 0))
768 break;
769 }
770 errno = save_errno;
771 }
772
773 if (pending_DATA) count--; /* Number of RCPT responses to come */
774 while (count-- > 0) /* Mark any pending addrs with the host used */
775 {
776 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
777 addr->host_used = sx->host;
778 addr = addr->next;
779 }
780 return -3;
781 }
782 }
783
784 if (pending_DATA) count--; /* Number of RCPT responses to come */
785
786 /* Read and handle the required number of RCPT responses, matching each one up
787 with an address by scanning for the next address whose status is PENDING_DEFER.
788 */
789
790 while (count-- > 0)
791 {
792 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
793
794 /* The address was accepted */
795 addr->host_used = sx->host;
796
797 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
798 '2', ob->command_timeout))
799 {
800 yield |= 1;
801 addr->transport_return = PENDING_OK;
802
803 /* If af_dr_retry_exists is set, there was a routing delay on this address;
804 ensure that any address-specific retry record is expunged. We do this both
805 for the basic key and for the version that also includes the sender. */
806
807 if (testflag(addr, af_dr_retry_exists))
808 {
809 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
810 sender_address);
811 retry_add_item(addr, altkey, rf_delete);
812 retry_add_item(addr, addr->address_retry_key, rf_delete);
813 }
814 }
815
816 /* Timeout while reading the response */
817
818 else if (errno == ETIMEDOUT)
819 {
820 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
821 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
822 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
823 retry_add_item(addr, addr->address_retry_key, 0);
824 update_waiting = FALSE;
825 return -1;
826 }
827
828 /* Handle other errors in obtaining an SMTP response by returning -1. This
829 will cause all the addresses to be deferred. Restore the SMTP command in
830 big_buffer for which we are checking the response, so the error message
831 makes sense. */
832
833 else if (errno != 0 || sx->buffer[0] == 0)
834 {
835 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
836 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
837 return -2;
838 }
839
840 /* Handle SMTP permanent and temporary response codes. */
841
842 else
843 {
844 addr->message =
845 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
846 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
847 string_printing(sx->buffer));
848 setflag(addr, af_pass_message);
849 if (!sx->verify)
850 msglog_line(sx->host, addr->message);
851
852 /* The response was 5xx */
853
854 if (sx->buffer[0] == '5')
855 {
856 addr->transport_return = FAIL;
857 yield |= 2;
858 }
859
860 /* The response was 4xx */
861
862 else
863 {
864 addr->transport_return = DEFER;
865 addr->basic_errno = ERRNO_RCPT4XX;
866 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
867
868 if (!sx->verify)
869 {
870 #ifndef DISABLE_EVENT
871 event_defer_errno = addr->more_errno;
872 msg_event_raise(US"msg:rcpt:host:defer", addr);
873 #endif
874
875 /* Log temporary errors if there are more hosts to be tried.
876 If not, log this last one in the == line. */
877
878 if (sx->host->next)
879 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
880 sx->host->name, sx->host->address, addr->message);
881
882 #ifndef DISABLE_EVENT
883 else
884 msg_event_raise(US"msg:rcpt:defer", addr);
885 #endif
886
887 /* Do not put this message on the list of those waiting for specific
888 hosts, as otherwise it is likely to be tried too often. */
889
890 update_waiting = FALSE;
891
892 /* Add a retry item for the address so that it doesn't get tried again
893 too soon. If address_retry_include_sender is true, add the sender address
894 to the retry key. */
895
896 retry_add_item(addr,
897 ob->address_retry_include_sender
898 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
899 : addr->address_retry_key,
900 0);
901 }
902 }
903 }
904 } /* Loop for next RCPT response */
905
906 /* Update where to start at for the next block of responses, unless we
907 have already handled all the addresses. */
908
909 if (addr) sx->sync_addr = addr->next;
910
911 /* Handle a response to DATA. If we have not had any good recipients, either
912 previously or in this block, the response is ignored. */
913
914 if (pending_DATA != 0 &&
915 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
916 '3', ob->command_timeout))
917 {
918 int code;
919 uschar *msg;
920 BOOL pass_message;
921 if (pending_DATA > 0 || (yield & 1) != 0)
922 {
923 if (errno == 0 && sx->buffer[0] == '4')
924 {
925 errno = ERRNO_DATA4XX;
926 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
927 }
928 return -3;
929 }
930 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
931 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
932 "is in use and there were no good recipients\n", msg);
933 }
934
935 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
936 present) received 3xx. If any RCPTs were handled and yielded anything other
937 than 4xx, yield will be set non-zero. */
938
939 return yield;
940 }
941
942
943
944 /* Do the client side of smtp-level authentication */
945 /*
946 Arguments:
947 buffer EHLO response from server (gets overwritten)
948 addrlist chain of potential addresses to deliver
949 host host to deliver to
950 ob transport options
951 ibp, obp comms channel control blocks
952
953 Returns:
954 OK Success, or failed (but not required): global "smtp_authenticated" set
955 DEFER Failed authentication (and was required)
956 ERROR Internal problem
957
958 FAIL_SEND Failed communications - transmit
959 FAIL - response
960 */
961
962 int
963 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
964 smtp_transport_options_block *ob, BOOL is_esmtp,
965 smtp_inblock *ibp, smtp_outblock *obp)
966 {
967 int require_auth;
968 uschar *fail_reason = US"server did not advertise AUTH support";
969
970 smtp_authenticated = FALSE;
971 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
972 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
973
974 if (is_esmtp && !regex_AUTH) regex_AUTH =
975 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
976 FALSE, TRUE);
977
978 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
979 {
980 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
981 expand_nmax = -1; /* reset */
982
983 /* Must not do this check until after we have saved the result of the
984 regex match above. */
985
986 if (require_auth == OK ||
987 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
988 {
989 auth_instance *au;
990 fail_reason = US"no common mechanisms were found";
991
992 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
993
994 /* Scan the configured authenticators looking for one which is configured
995 for use as a client, which is not suppressed by client_condition, and
996 whose name matches an authentication mechanism supported by the server.
997 If one is found, attempt to authenticate by calling its client function.
998 */
999
1000 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1001 {
1002 uschar *p = names;
1003 if (!au->client ||
1004 (au->client_condition != NULL &&
1005 !expand_check_condition(au->client_condition, au->name,
1006 US"client authenticator")))
1007 {
1008 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1009 au->name,
1010 (au->client)? "client_condition is false" :
1011 "not configured as a client");
1012 continue;
1013 }
1014
1015 /* Loop to scan supported server mechanisms */
1016
1017 while (*p != 0)
1018 {
1019 int rc;
1020 int len = Ustrlen(au->public_name);
1021 while (isspace(*p)) p++;
1022
1023 if (strncmpic(au->public_name, p, len) != 0 ||
1024 (p[len] != 0 && !isspace(p[len])))
1025 {
1026 while (*p != 0 && !isspace(*p)) p++;
1027 continue;
1028 }
1029
1030 /* Found data for a listed mechanism. Call its client entry. Set
1031 a flag in the outblock so that data is overwritten after sending so
1032 that reflections don't show it. */
1033
1034 fail_reason = US"authentication attempt(s) failed";
1035 obp->authenticating = TRUE;
1036 rc = (au->info->clientcode)(au, ibp, obp,
1037 ob->command_timeout, buffer, bufsize);
1038 obp->authenticating = FALSE;
1039 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1040 au->name, rc);
1041
1042 /* A temporary authentication failure must hold up delivery to
1043 this host. After a permanent authentication failure, we carry on
1044 to try other authentication methods. If all fail hard, try to
1045 deliver the message unauthenticated unless require_auth was set. */
1046
1047 switch(rc)
1048 {
1049 case OK:
1050 smtp_authenticated = TRUE; /* stops the outer loop */
1051 client_authenticator = au->name;
1052 if (au->set_client_id != NULL)
1053 client_authenticated_id = expand_string(au->set_client_id);
1054 break;
1055
1056 /* Failure after writing a command */
1057
1058 case FAIL_SEND:
1059 return FAIL_SEND;
1060
1061 /* Failure after reading a response */
1062
1063 case FAIL:
1064 if (errno != 0 || buffer[0] != '5') return FAIL;
1065 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1066 au->name, host->name, host->address, buffer);
1067 break;
1068
1069 /* Failure by some other means. In effect, the authenticator
1070 decided it wasn't prepared to handle this case. Typically this
1071 is the result of "fail" in an expansion string. Do we need to
1072 log anything here? Feb 2006: a message is now put in the buffer
1073 if logging is required. */
1074
1075 case CANCELLED:
1076 if (*buffer != 0)
1077 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1078 "authentication H=%s [%s] %s", au->name, host->name,
1079 host->address, buffer);
1080 break;
1081
1082 /* Internal problem, message in buffer. */
1083
1084 case ERROR:
1085 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1086 DEFER, FALSE);
1087 return ERROR;
1088 }
1089
1090 break; /* If not authenticated, try next authenticator */
1091 } /* Loop for scanning supported server mechanisms */
1092 } /* Loop for further authenticators */
1093 }
1094 }
1095
1096 /* If we haven't authenticated, but are required to, give up. */
1097
1098 if (require_auth == OK && !smtp_authenticated)
1099 {
1100 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1101 string_sprintf("authentication required but %s", fail_reason), DEFER,
1102 FALSE);
1103 return DEFER;
1104 }
1105
1106 return OK;
1107 }
1108
1109
1110 /* Construct AUTH appendix string for MAIL TO */
1111 /*
1112 Arguments
1113 buffer to build string
1114 addrlist chain of potential addresses to deliver
1115 ob transport options
1116
1117 Globals smtp_authenticated
1118 client_authenticated_sender
1119 Return True on error, otherwise buffer has (possibly empty) terminated string
1120 */
1121
1122 BOOL
1123 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1124 smtp_transport_options_block *ob)
1125 {
1126 uschar *local_authenticated_sender = authenticated_sender;
1127
1128 #ifdef notdef
1129 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1130 #endif
1131
1132 if (ob->authenticated_sender != NULL)
1133 {
1134 uschar *new = expand_string(ob->authenticated_sender);
1135 if (new == NULL)
1136 {
1137 if (!expand_string_forcedfail)
1138 {
1139 uschar *message = string_sprintf("failed to expand "
1140 "authenticated_sender: %s", expand_string_message);
1141 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1142 return TRUE;
1143 }
1144 }
1145 else if (new[0] != 0) local_authenticated_sender = new;
1146 }
1147
1148 /* Add the authenticated sender address if present */
1149
1150 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1151 local_authenticated_sender != NULL)
1152 {
1153 string_format(buffer, bufsize, " AUTH=%s",
1154 auth_xtextencode(local_authenticated_sender,
1155 Ustrlen(local_authenticated_sender)));
1156 client_authenticated_sender = string_copy(local_authenticated_sender);
1157 }
1158 else
1159 *buffer= 0;
1160
1161 return FALSE;
1162 }
1163
1164
1165
1166 #ifdef EXPERIMENTAL_DANE
1167 /* Lookup TLSA record for host/port.
1168 Return: OK success with dnssec; DANE mode
1169 DEFER Do not use this host now, may retry later
1170 FAIL_FORCED No TLSA record; DANE not usable
1171 FAIL Do not use this connection
1172 */
1173
1174 int
1175 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1176 {
1177 /* move this out to host.c given the similarity to dns_lookup() ? */
1178 uschar buffer[300];
1179 const uschar * fullname = buffer;
1180
1181 /* TLSA lookup string */
1182 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1183
1184 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1185 {
1186 case DNS_SUCCEED:
1187 if (!dns_is_secure(dnsa))
1188 {
1189 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1190 return DEFER;
1191 }
1192 return OK;
1193
1194 case DNS_AGAIN:
1195 return DEFER; /* just defer this TLS'd conn */
1196
1197 case DNS_NODATA: /* no TLSA RR for this lookup */
1198 case DNS_NOMATCH: /* no records at all for this lookup */
1199 return dane_required ? FAIL : FAIL_FORCED;
1200
1201 default:
1202 case DNS_FAIL:
1203 return dane_required ? FAIL : DEFER;
1204 }
1205 }
1206 #endif
1207
1208
1209
1210 typedef struct smtp_compare_s
1211 {
1212 uschar *current_sender_address;
1213 struct transport_instance *tblock;
1214 } smtp_compare_t;
1215
1216
1217 /* Create a unique string that identifies this message, it is based on
1218 sender_address, helo_data and tls_certificate if enabled.
1219 */
1220
1221 static uschar *
1222 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1223 {
1224 address_item * addr1;
1225 uschar * if1 = US"";
1226 uschar * helo1 = US"";
1227 #ifdef SUPPORT_TLS
1228 uschar * tlsc1 = US"";
1229 #endif
1230 uschar * save_sender_address = sender_address;
1231 uschar * local_identity = NULL;
1232 smtp_transport_options_block * ob =
1233 (smtp_transport_options_block *)tblock->options_block;
1234
1235 sender_address = sender;
1236
1237 addr1 = deliver_make_addr (sender, TRUE);
1238 deliver_set_expansions(addr1);
1239
1240 if (ob->interface)
1241 if1 = expand_string(ob->interface);
1242
1243 if (ob->helo_data)
1244 helo1 = expand_string(ob->helo_data);
1245
1246 #ifdef SUPPORT_TLS
1247 if (ob->tls_certificate)
1248 tlsc1 = expand_string(ob->tls_certificate);
1249 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1250 #else
1251 local_identity = string_sprintf ("%s^%s", if1, helo1);
1252 #endif
1253
1254 deliver_set_expansions(NULL);
1255 sender_address = save_sender_address;
1256
1257 return local_identity;
1258 }
1259
1260
1261
1262 /* This routine is a callback that is called from transport_check_waiting.
1263 This function will evaluate the incoming message versus the previous
1264 message. If the incoming message is using a different local identity then
1265 we will veto this new message. */
1266
1267 static BOOL
1268 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1269 {
1270 uschar * message_local_identity,
1271 * current_local_identity,
1272 * new_sender_address;
1273
1274 current_local_identity =
1275 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1276
1277 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1278 return 0;
1279
1280 message_local_identity =
1281 smtp_local_identity(new_sender_address, s_compare->tblock);
1282
1283 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1284 }
1285
1286
1287
1288 static uschar
1289 ehlo_response(uschar * buf, uschar checks)
1290 {
1291 size_t bsize = Ustrlen(buf);
1292
1293 #ifdef SUPPORT_TLS
1294 if ( checks & PEER_OFFERED_TLS
1295 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1296 checks &= ~PEER_OFFERED_TLS;
1297 #endif
1298
1299 if ( checks & PEER_OFFERED_IGNQ
1300 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1301 PCRE_EOPT, NULL, 0) < 0)
1302 checks &= ~PEER_OFFERED_IGNQ;
1303
1304 if ( checks & PEER_OFFERED_CHUNKING
1305 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1306 checks &= ~PEER_OFFERED_CHUNKING;
1307
1308 #ifndef DISABLE_PRDR
1309 if ( checks & PEER_OFFERED_PRDR
1310 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1311 checks &= ~PEER_OFFERED_PRDR;
1312 #endif
1313
1314 #ifdef SUPPORT_I18N
1315 if ( checks & PEER_OFFERED_UTF8
1316 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1317 checks &= ~PEER_OFFERED_UTF8;
1318 #endif
1319
1320 if ( checks & PEER_OFFERED_DSN
1321 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1322 checks &= ~PEER_OFFERED_DSN;
1323
1324 if ( checks & PEER_OFFERED_PIPE
1325 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~PEER_OFFERED_PIPE;
1328
1329 if ( checks & PEER_OFFERED_SIZE
1330 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_SIZE;
1332
1333 return checks;
1334 }
1335
1336
1337
1338 /* Callback for emitting a BDAT data chunk header.
1339
1340 If given a nonzero size, first flush any buffered SMTP commands
1341 then emit the command.
1342
1343 Reap previous SMTP command responses if requested.
1344 Reap one SMTP command response if requested.
1345
1346 Returns: OK or ERROR
1347 */
1348
1349 static int
1350 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1351 unsigned chunk_size, unsigned flags)
1352 {
1353 smtp_transport_options_block * ob =
1354 (smtp_transport_options_block *)(tctx->tblock->options_block);
1355 smtp_context * sx = tctx->smtp_context;
1356 int cmd_count = 0;
1357 int prev_cmd_count;
1358
1359 /* Write SMTP chunk header command */
1360
1361 if (chunk_size > 0)
1362 {
1363 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
1364 chunk_size,
1365 flags & tc_chunk_last ? " LAST" : "")
1366 ) < 0) return ERROR;
1367 if (flags & tc_chunk_last)
1368 data_command = string_copy(big_buffer); /* Save for later error message */
1369 }
1370
1371 prev_cmd_count = cmd_count += sx->cmd_count;
1372
1373 /* Reap responses for any previous, but not one we just emitted */
1374
1375 if (chunk_size > 0)
1376 prev_cmd_count--;
1377 if (sx->pending_BDAT)
1378 prev_cmd_count--;
1379
1380 if (flags & tc_reap_prev && prev_cmd_count > 0)
1381 {
1382 DEBUG(D_transport) debug_printf("look for %d responses"
1383 " for previous pipelined cmds\n", prev_cmd_count);
1384
1385 switch(sync_responses(sx, prev_cmd_count, 0))
1386 {
1387 case 1: /* 2xx (only) => OK */
1388 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1389 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1390 case 0: break; /* No 2xx or 5xx, but no probs */
1391
1392 case -1: /* Timeout on RCPT */
1393 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1394 }
1395 cmd_count = 1;
1396 if (!sx->pending_BDAT)
1397 pipelining_active = FALSE;
1398 }
1399
1400 /* Reap response for an outstanding BDAT */
1401
1402 if (sx->pending_BDAT)
1403 {
1404 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1405
1406 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1407 ob->command_timeout))
1408 {
1409 if (errno == 0 && sx->buffer[0] == '4')
1410 {
1411 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1412 sx->first_addr->more_errno |=
1413 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1414 }
1415 return ERROR;
1416 }
1417 cmd_count--;
1418 sx->pending_BDAT = FALSE;
1419 pipelining_active = FALSE;
1420 }
1421 else if (chunk_size > 0)
1422 sx->pending_BDAT = TRUE;
1423
1424
1425 sx->cmd_count = cmd_count;
1426 return OK;
1427 }
1428
1429
1430
1431 /*************************************************
1432 * Make connection for given message *
1433 *************************************************/
1434
1435 /*
1436 Arguments:
1437 ctx connection context
1438 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1439 a second attempt after TLS initialization fails
1440
1441 Returns: OK - the connection was made and the delivery attempted;
1442 fd is set in the conn context, tls_out set up.
1443 DEFER - the connection could not be made, or something failed
1444 while setting up the SMTP session, or there was a
1445 non-message-specific error, such as a timeout.
1446 ERROR - helo_data or add_headers or authenticated_sender is
1447 specified for this transport, and the string failed
1448 to expand
1449 */
1450 int
1451 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1452 {
1453 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1454 dns_answer tlsa_dnsa;
1455 #endif
1456 BOOL pass_message = FALSE;
1457 uschar * message = NULL;
1458 int yield = OK;
1459 int rc;
1460
1461 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1462
1463 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1464 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1465 sx->ok = FALSE;
1466 sx->send_rset = TRUE;
1467 sx->send_quit = TRUE;
1468 sx->setting_up = TRUE;
1469 sx->esmtp = TRUE;
1470 sx->esmtp_sent = FALSE;
1471 #ifdef SUPPORT_I18N
1472 sx->utf8_needed = FALSE;
1473 #endif
1474 sx->dsn_all_lasthop = TRUE;
1475 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1476 sx->dane = FALSE;
1477 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1478 #endif
1479
1480 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1481 sx->peer_offered = 0;
1482 sx->igquotstr = US"";
1483 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1484 #ifdef EXPERIMENTAL_DSN_INFO
1485 sx->smtp_greeting = NULL;
1486 sx->helo_response = NULL;
1487 #endif
1488
1489 smtp_command = US"initial connection";
1490 sx->buffer[0] = '\0';
1491
1492 /* Set up the buffer for reading SMTP response packets. */
1493
1494 sx->inblock.buffer = sx->inbuffer;
1495 sx->inblock.buffersize = sizeof(sx->inbuffer);
1496 sx->inblock.ptr = sx->inbuffer;
1497 sx->inblock.ptrend = sx->inbuffer;
1498
1499 /* Set up the buffer for holding SMTP commands while pipelining */
1500
1501 sx->outblock.buffer = sx->outbuffer;
1502 sx->outblock.buffersize = sizeof(sx->outbuffer);
1503 sx->outblock.ptr = sx->outbuffer;
1504 sx->outblock.cmd_count = 0;
1505 sx->outblock.authenticating = FALSE;
1506
1507 /* Reset the parameters of a TLS session. */
1508
1509 tls_out.bits = 0;
1510 tls_out.cipher = NULL; /* the one we may use for this transport */
1511 tls_out.ourcert = NULL;
1512 tls_out.peercert = NULL;
1513 tls_out.peerdn = NULL;
1514 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1515 tls_out.sni = NULL;
1516 #endif
1517 tls_out.ocsp = OCSP_NOT_REQ;
1518
1519 /* Flip the legacy TLS-related variables over to the outbound set in case
1520 they're used in the context of the transport. Don't bother resetting
1521 afterward (when being used by a transport) as we're in a subprocess.
1522 For verify, unflipped once the callout is dealt with */
1523
1524 tls_modify_variables(&tls_out);
1525
1526 #ifndef SUPPORT_TLS
1527 if (sx->smtps)
1528 {
1529 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1530 DEFER, FALSE);
1531 return ERROR;
1532 }
1533 #endif
1534
1535 /* Make a connection to the host if this isn't a continued delivery, and handle
1536 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1537 specially so they can be identified for retries. */
1538
1539 if (continue_hostname == NULL)
1540 {
1541 if (sx->verify)
1542 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1543
1544 /* This puts port into host->port */
1545 sx->inblock.sock = sx->outblock.sock =
1546 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1547 sx->ob->connect_timeout, sx->tblock);
1548
1549 if (sx->inblock.sock < 0)
1550 {
1551 uschar * msg = NULL;
1552 if (sx->verify)
1553 {
1554 msg = strerror(errno);
1555 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1556 }
1557 set_errno_nohost(sx->addrlist,
1558 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1559 sx->verify ? string_sprintf("could not connect: %s", msg)
1560 : NULL,
1561 DEFER, FALSE);
1562 sx->send_quit = FALSE;
1563 return DEFER;
1564 }
1565
1566 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1567 {
1568 tls_out.dane_verified = FALSE;
1569 tls_out.tlsa_usage = 0;
1570
1571 if (sx->host->dnssec == DS_YES)
1572 {
1573 if( sx->dane_required
1574 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1575 )
1576 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1577 {
1578 case OK: sx->dane = TRUE; break;
1579 case FAIL_FORCED: break;
1580 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1581 string_sprintf("DANE error: tlsa lookup %s",
1582 rc == DEFER ? "DEFER" : "FAIL"),
1583 rc, FALSE);
1584 return rc;
1585 }
1586 }
1587 else if (sx->dane_required)
1588 {
1589 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1590 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1591 FAIL, FALSE);
1592 return FAIL;
1593 }
1594
1595 if (sx->dane)
1596 sx->ob->tls_tempfail_tryclear = FALSE;
1597 }
1598 #endif /*DANE*/
1599
1600 /* Expand the greeting message while waiting for the initial response. (Makes
1601 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1602 delayed till here so that $sending_interface and $sending_port are set. */
1603
1604 if (sx->helo_data)
1605 if (!(sx->helo_data = expand_string(sx->helo_data)))
1606 if (sx->verify)
1607 log_write(0, LOG_MAIN|LOG_PANIC,
1608 "<%s>: failed to expand transport's helo_data value for callout: %s",
1609 sx->addrlist->address, expand_string_message);
1610
1611 #ifdef SUPPORT_I18N
1612 if (sx->helo_data)
1613 {
1614 expand_string_message = NULL;
1615 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1616 &expand_string_message)),
1617 expand_string_message)
1618 if (sx->verify)
1619 log_write(0, LOG_MAIN|LOG_PANIC,
1620 "<%s>: failed to expand transport's helo_data value for callout: %s",
1621 sx->addrlist->address, expand_string_message);
1622 else
1623 sx->helo_data = NULL;
1624 }
1625 #endif
1626
1627 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1628 is nevertheless a reasonably clean way of programming this kind of logic,
1629 where you want to escape on any error. */
1630
1631 if (!sx->smtps)
1632 {
1633 BOOL good_response;
1634
1635 #ifdef TCP_QUICKACK
1636 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1637 #endif
1638 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1639 '2', sx->ob->command_timeout);
1640 #ifdef EXPERIMENTAL_DSN_INFO
1641 sx->smtp_greeting = string_copy(sx->buffer);
1642 #endif
1643 if (!good_response) goto RESPONSE_FAILED;
1644
1645 #ifndef DISABLE_EVENT
1646 {
1647 uschar * s;
1648 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1649 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1650 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1651 if (s)
1652 {
1653 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1654 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1655 DEFER, FALSE);
1656 yield = DEFER;
1657 goto SEND_QUIT;
1658 }
1659 }
1660 #endif
1661
1662 /* Now check if the helo_data expansion went well, and sign off cleanly if
1663 it didn't. */
1664
1665 if (!sx->helo_data)
1666 {
1667 message = string_sprintf("failed to expand helo_data: %s",
1668 expand_string_message);
1669 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1670 yield = DEFER;
1671 goto SEND_QUIT;
1672 }
1673 }
1674
1675 /** Debugging without sending a message
1676 sx->addrlist->transport_return = DEFER;
1677 goto SEND_QUIT;
1678 **/
1679
1680 /* Errors that occur after this point follow an SMTP command, which is
1681 left in big_buffer by smtp_write_command() for use in error messages. */
1682
1683 smtp_command = big_buffer;
1684
1685 /* Tell the remote who we are...
1686
1687 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1688 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1689 greeting is of this form. The assumption was that the far end supports it
1690 properly... but experience shows that there are some that give 5xx responses,
1691 even though the banner includes "ESMTP" (there's a bloody-minded one that
1692 says "ESMTP not spoken here"). Cope with that case.
1693
1694 September 2000: Time has passed, and it seems reasonable now to always send
1695 EHLO at the start. It is also convenient to make the change while installing
1696 the TLS stuff.
1697
1698 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1699 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1700 would be no way to send out the mails, so there is now a host list
1701 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1702 PIPELINING problem as well. Maybe it can also be useful to cure other
1703 problems with broken servers.
1704
1705 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1706 Then somebody tried it with a Microsoft mailer... It seems that all other
1707 mailers use upper case for some reason (the RFC is quite clear about case
1708 independence) so, for peace of mind, I gave in. */
1709
1710 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1711
1712 /* Alas; be careful, since this goto is not an error-out, so conceivably
1713 we might set data between here and the target which we assume to exist
1714 and be usable. I can see this coming back to bite us. */
1715 #ifdef SUPPORT_TLS
1716 if (sx->smtps)
1717 {
1718 smtp_peer_options |= PEER_OFFERED_TLS;
1719 suppress_tls = FALSE;
1720 sx->ob->tls_tempfail_tryclear = FALSE;
1721 smtp_command = US"SSL-on-connect";
1722 goto TLS_NEGOTIATE;
1723 }
1724 #endif
1725
1726 if (sx->esmtp)
1727 {
1728 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1729 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1730 goto SEND_FAILED;
1731 sx->esmtp_sent = TRUE;
1732 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1733 sx->ob->command_timeout))
1734 {
1735 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1736 {
1737 #ifdef EXPERIMENTAL_DSN_INFO
1738 sx->helo_response = string_copy(sx->buffer);
1739 #endif
1740 goto RESPONSE_FAILED;
1741 }
1742 sx->esmtp = FALSE;
1743 }
1744 #ifdef EXPERIMENTAL_DSN_INFO
1745 sx->helo_response = string_copy(sx->buffer);
1746 #endif
1747 }
1748 else
1749 DEBUG(D_transport)
1750 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1751
1752 if (!sx->esmtp)
1753 {
1754 BOOL good_response;
1755 int n = sizeof(sx->buffer);
1756 uschar * rsp = sx->buffer;
1757
1758 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1759 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1760
1761 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1762 goto SEND_FAILED;
1763 good_response = smtp_read_response(&sx->inblock, rsp, n,
1764 '2', sx->ob->command_timeout);
1765 #ifdef EXPERIMENTAL_DSN_INFO
1766 sx->helo_response = string_copy(rsp);
1767 #endif
1768 if (!good_response)
1769 {
1770 /* Handle special logging for a closed connection after HELO
1771 when had previously sent EHLO */
1772
1773 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1774 {
1775 errno = ERRNO_SMTPCLOSED;
1776 goto EHLOHELO_FAILED;
1777 }
1778 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1779 goto RESPONSE_FAILED;
1780 }
1781 }
1782
1783 sx->peer_offered = smtp_peer_options = 0;
1784
1785 if (sx->esmtp || sx->lmtp)
1786 {
1787 sx->peer_offered = ehlo_response(sx->buffer,
1788 PEER_OFFERED_TLS /* others checked later */
1789 );
1790
1791 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1792
1793 #ifdef SUPPORT_TLS
1794 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1795 #endif
1796 }
1797 }
1798
1799 /* For continuing deliveries down the same channel, the socket is the standard
1800 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1801 below). Set up the pointer to where subsequent commands will be left, for
1802 error messages. Note that smtp_peer_options will have been
1803 set from the command line if they were set in the process that passed the
1804 connection on. */
1805
1806 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1807 as the continue goes via transport_pass_socket() and doublefork and exec.
1808 It does not wait. Unclear how we keep separate host's responses
1809 separate - we could match up by host ip+port as a bodge. */
1810
1811 else
1812 {
1813 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1814 smtp_command = big_buffer;
1815 sx->host->port = sx->port; /* Record the port that was used */
1816 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1817 }
1818
1819 /* If TLS is available on this connection, whether continued or not, attempt to
1820 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1821 send another EHLO - the server may give a different answer in secure mode. We
1822 use a separate buffer for reading the response to STARTTLS so that if it is
1823 negative, the original EHLO data is available for subsequent analysis, should
1824 the client not be required to use TLS. If the response is bad, copy the buffer
1825 for error analysis. */
1826
1827 #ifdef SUPPORT_TLS
1828 if ( smtp_peer_options & PEER_OFFERED_TLS
1829 && !suppress_tls
1830 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1831 && ( !sx->verify
1832 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1833 ) )
1834 {
1835 uschar buffer2[4096];
1836 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1837 goto SEND_FAILED;
1838
1839 /* If there is an I/O error, transmission of this message is deferred. If
1840 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1841 false, we also defer. However, if there is a temporary rejection of STARTTLS
1842 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1843 STARTTLS, we carry on. This means we will try to send the message in clear,
1844 unless the host is in hosts_require_tls (tested below). */
1845
1846 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1847 sx->ob->command_timeout))
1848 {
1849 if ( errno != 0
1850 || buffer2[0] == 0
1851 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1852 )
1853 {
1854 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1855 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1856 goto RESPONSE_FAILED;
1857 }
1858 }
1859
1860 /* STARTTLS accepted: try to negotiate a TLS session. */
1861
1862 else
1863 TLS_NEGOTIATE:
1864 {
1865 address_item * addr;
1866 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1867 # ifdef EXPERIMENTAL_DANE
1868 , sx->dane ? &tlsa_dnsa : NULL
1869 # endif
1870 );
1871
1872 /* TLS negotiation failed; give an error. From outside, this function may
1873 be called again to try in clear on a new connection, if the options permit
1874 it for this host. */
1875
1876 if (rc != OK)
1877 {
1878 # ifdef EXPERIMENTAL_DANE
1879 if (sx->dane) log_write(0, LOG_MAIN,
1880 "DANE attempt failed; no TLS connection to %s [%s]",
1881 sx->host->name, sx->host->address);
1882 # endif
1883
1884 errno = ERRNO_TLSFAILURE;
1885 message = US"failure while setting up TLS session";
1886 sx->send_quit = FALSE;
1887 goto TLS_FAILED;
1888 }
1889
1890 /* TLS session is set up */
1891
1892 smtp_peer_options_wrap = smtp_peer_options;
1893 for (addr = sx->addrlist; addr; addr = addr->next)
1894 if (addr->transport_return == PENDING_DEFER)
1895 {
1896 addr->cipher = tls_out.cipher;
1897 addr->ourcert = tls_out.ourcert;
1898 addr->peercert = tls_out.peercert;
1899 addr->peerdn = tls_out.peerdn;
1900 addr->ocsp = tls_out.ocsp;
1901 }
1902 }
1903 }
1904
1905 /* if smtps, we'll have smtp_command set to something else; always safe to
1906 reset it here. */
1907 smtp_command = big_buffer;
1908
1909 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1910 helo_data is null, we are dealing with a connection that was passed from
1911 another process, and so we won't have expanded helo_data above. We have to
1912 expand it here. $sending_ip_address and $sending_port are set up right at the
1913 start of the Exim process (in exim.c). */
1914
1915 if (tls_out.active >= 0)
1916 {
1917 char *greeting_cmd;
1918 BOOL good_response;
1919
1920 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1921 {
1922 uschar *message = string_sprintf("failed to expand helo_data: %s",
1923 expand_string_message);
1924 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1925 yield = DEFER;
1926 goto SEND_QUIT;
1927 }
1928
1929 /* For SMTPS we need to wait for the initial OK response. */
1930 if (sx->smtps)
1931 {
1932 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1933 '2', sx->ob->command_timeout);
1934 #ifdef EXPERIMENTAL_DSN_INFO
1935 sx->smtp_greeting = string_copy(sx->buffer);
1936 #endif
1937 if (!good_response) goto RESPONSE_FAILED;
1938 }
1939
1940 if (sx->esmtp)
1941 greeting_cmd = "EHLO";
1942 else
1943 {
1944 greeting_cmd = "HELO";
1945 DEBUG(D_transport)
1946 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1947 }
1948
1949 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1950 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1951 goto SEND_FAILED;
1952 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1953 '2', sx->ob->command_timeout);
1954 #ifdef EXPERIMENTAL_DSN_INFO
1955 sx->helo_response = string_copy(sx->buffer);
1956 #endif
1957 if (!good_response) goto RESPONSE_FAILED;
1958 smtp_peer_options = 0;
1959 }
1960
1961 /* If the host is required to use a secure channel, ensure that we
1962 have one. */
1963
1964 else if ( sx->smtps
1965 # ifdef EXPERIMENTAL_DANE
1966 || sx->dane
1967 # endif
1968 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
1969 )
1970 {
1971 errno = ERRNO_TLSREQUIRED;
1972 message = string_sprintf("a TLS session is required, but %s",
1973 smtp_peer_options & PEER_OFFERED_TLS
1974 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
1975 goto TLS_FAILED;
1976 }
1977 #endif /*SUPPORT_TLS*/
1978
1979 /* If TLS is active, we have just started it up and re-done the EHLO command,
1980 so its response needs to be analyzed. If TLS is not active and this is a
1981 continued session down a previously-used socket, we haven't just done EHLO, so
1982 we skip this. */
1983
1984 if (continue_hostname == NULL
1985 #ifdef SUPPORT_TLS
1986 || tls_out.active >= 0
1987 #endif
1988 )
1989 {
1990 if (sx->esmtp || sx->lmtp)
1991 {
1992 sx->peer_offered = ehlo_response(sx->buffer,
1993 0 /* no TLS */
1994 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1995 | PEER_OFFERED_CHUNKING
1996 | PEER_OFFERED_PRDR
1997 #ifdef SUPPORT_I18N
1998 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1999 /*XXX if we hand peercaps on to continued-conn processes,
2000 must not depend on this addr */
2001 #endif
2002 | PEER_OFFERED_DSN
2003 | PEER_OFFERED_PIPE
2004 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2005 );
2006
2007 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2008 lmtp_ignore_quota option was set. */
2009
2010 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2011
2012 /* If the response to EHLO specified support for the SIZE parameter, note
2013 this, provided size_addition is non-negative. */
2014
2015 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2016
2017 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2018 the current host, esmtp will be false, so PIPELINING can never be used. If
2019 the current host matches hosts_avoid_pipelining, don't do it. */
2020
2021 if ( sx->peer_offered & PEER_OFFERED_PIPE
2022 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2023 smtp_peer_options |= PEER_OFFERED_PIPE;
2024
2025 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2026 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2027
2028 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2029 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2030 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2031
2032 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2033 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2034
2035 #ifndef DISABLE_PRDR
2036 if ( sx->peer_offered & PEER_OFFERED_PRDR
2037 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2038 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2039
2040 if (sx->peer_offered & PEER_OFFERED_PRDR)
2041 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2042 #endif
2043
2044 /* Note if the server supports DSN */
2045 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2046 DEBUG(D_transport) debug_printf("%susing DSN\n",
2047 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2048
2049 /* Note if the response to EHLO specifies support for the AUTH extension.
2050 If it has, check that this host is one we want to authenticate to, and do
2051 the business. The host name and address must be available when the
2052 authenticator's client driver is running. */
2053
2054 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2055 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2056 {
2057 default: goto SEND_QUIT;
2058 case OK: break;
2059 case FAIL_SEND: goto SEND_FAILED;
2060 case FAIL: goto RESPONSE_FAILED;
2061 }
2062 }
2063 }
2064 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2065
2066 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2067 message-specific. */
2068
2069 sx->setting_up = FALSE;
2070
2071 #ifdef SUPPORT_I18N
2072 if (sx->addrlist->prop.utf8_msg)
2073 {
2074 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2075 && !sx->addrlist->prop.utf8_downcvt_maybe;
2076 DEBUG(D_transport) if (!sx->utf8_needed)
2077 debug_printf("utf8: %s downconvert\n",
2078 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2079 }
2080
2081 /* If this is an international message we need the host to speak SMTPUTF8 */
2082 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2083 {
2084 errno = ERRNO_UTF8_FWD;
2085 goto RESPONSE_FAILED;
2086 }
2087 #endif
2088
2089 return OK;
2090
2091
2092 {
2093 int code;
2094
2095 RESPONSE_FAILED:
2096 message = NULL;
2097 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2098 sx->buffer, &code, &message, &pass_message);
2099 goto FAILED;
2100
2101 SEND_FAILED:
2102 code = '4';
2103 message = US string_sprintf("send() to %s [%s] failed: %s",
2104 sx->host->name, sx->host->address, strerror(errno));
2105 sx->send_quit = FALSE;
2106 goto FAILED;
2107
2108 /* This label is jumped to directly when a TLS negotiation has failed,
2109 or was not done for a host for which it is required. Values will be set
2110 in message and errno, and setting_up will always be true. Treat as
2111 a temporary error. */
2112
2113 EHLOHELO_FAILED:
2114 code = '4';
2115 message = string_sprintf("Remote host closed connection in response to %s"
2116 " (EHLO response was: %s)", smtp_command, sx->buffer);
2117 sx->send_quit = FALSE;
2118 goto FAILED;
2119
2120 #ifdef SUPPORT_TLS
2121 TLS_FAILED:
2122 code = '4';
2123 goto FAILED;
2124 #endif
2125
2126 /* The failure happened while setting up the call; see if the failure was
2127 a 5xx response (this will either be on connection, or following HELO - a 5xx
2128 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2129 never going to accept them. For other errors during setting up (timeouts or
2130 whatever), defer all addresses, and yield DEFER, so that the host is not
2131 tried again for a while. */
2132
2133 FAILED:
2134 sx->ok = FALSE; /* For when reached by GOTO */
2135
2136 yield = code == '5'
2137 #ifdef SUPPORT_I18N
2138 || errno == ERRNO_UTF8_FWD
2139 #endif
2140 ? FAIL : DEFER;
2141
2142 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2143 #ifdef EXPERIMENTAL_DSN_INFO
2144 , sx->smtp_greeting, sx->helo_response
2145 #endif
2146 );
2147 }
2148
2149
2150 SEND_QUIT:
2151
2152 if (sx->send_quit)
2153 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2154
2155 #ifdef SUPPORT_TLS
2156 tls_close(FALSE, TRUE);
2157 #endif
2158
2159 /* Close the socket, and return the appropriate value, first setting
2160 works because the NULL setting is passed back to the calling process, and
2161 remote_max_parallel is forced to 1 when delivering over an existing connection,
2162
2163 If all went well and continue_more is set, we shouldn't actually get here if
2164 there are further addresses, as the return above will be taken. However,
2165 writing RSET might have failed, or there may be other addresses whose hosts are
2166 specified in the transports, and therefore not visible at top level, in which
2167 case continue_more won't get set. */
2168
2169 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2170 if (sx->send_quit)
2171 {
2172 shutdown(sx->outblock.sock, SHUT_WR);
2173 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2174 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2175 rc--; /* drain socket */
2176 sx->send_quit = FALSE;
2177 }
2178 (void)close(sx->inblock.sock);
2179 sx->inblock.sock = sx->outblock.sock = -1;
2180
2181 #ifndef DISABLE_EVENT
2182 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2183 #endif
2184
2185 continue_transport = NULL;
2186 continue_hostname = NULL;
2187 return yield;
2188 }
2189
2190
2191
2192
2193 /* Create the string of options that will be appended to the MAIL FROM:
2194 in the connection context buffer */
2195
2196 static int
2197 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2198 {
2199 uschar * p = sx->buffer;
2200 address_item * addr;
2201 int address_count;
2202
2203 *p = 0;
2204
2205 /* If we know the receiving MTA supports the SIZE qualification,
2206 send it, adding something to the message size to allow for imprecision
2207 and things that get added en route. Exim keeps the number of lines
2208 in a message, so we can give an accurate value for the original message, but we
2209 need some additional to handle added headers. (Double "." characters don't get
2210 included in the count.) */
2211
2212 if (sx->peer_offered & PEER_OFFERED_SIZE)
2213 {
2214 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2215 while (*p) p++;
2216 }
2217
2218 #ifndef DISABLE_PRDR
2219 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2220 request that */
2221
2222 sx->prdr_active = FALSE;
2223 if (sx->peer_offered & PEER_OFFERED_PRDR)
2224 for (addr = addrlist; addr; addr = addr->next)
2225 if (addr->transport_return == PENDING_DEFER)
2226 {
2227 for (addr = addr->next; addr; addr = addr->next)
2228 if (addr->transport_return == PENDING_DEFER)
2229 { /* at least two recipients to send */
2230 sx->prdr_active = TRUE;
2231 sprintf(CS p, " PRDR"); p += 5;
2232 break;
2233 }
2234 break;
2235 }
2236 #endif
2237
2238 #ifdef SUPPORT_I18N
2239 /* If it supports internationalised messages, and this meesage need that,
2240 request it */
2241
2242 if ( sx->peer_offered & PEER_OFFERED_UTF8
2243 && addrlist->prop.utf8_msg
2244 && !addrlist->prop.utf8_downcvt
2245 )
2246 Ustrcpy(p, " SMTPUTF8"), p += 9;
2247 #endif
2248
2249 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2250 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2251 addr && address_count < sx->max_rcpt;
2252 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2253 {
2254 address_count++;
2255 if (!(addr->dsn_flags & rf_dsnlasthop))
2256 {
2257 sx->dsn_all_lasthop = FALSE;
2258 break;
2259 }
2260 }
2261
2262 /* Add any DSN flags to the mail command */
2263
2264 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2265 {
2266 if (dsn_ret == dsn_ret_hdrs)
2267 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2268 else if (dsn_ret == dsn_ret_full)
2269 { Ustrcpy(p, " RET=FULL"); p += 9; }
2270
2271 if (dsn_envid)
2272 {
2273 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2274 while (*p) p++;
2275 }
2276 }
2277
2278 /* If an authenticated_sender override has been specified for this transport
2279 instance, expand it. If the expansion is forced to fail, and there was already
2280 an authenticated_sender for this message, the original value will be used.
2281 Other expansion failures are serious. An empty result is ignored, but there is
2282 otherwise no check - this feature is expected to be used with LMTP and other
2283 cases where non-standard addresses (e.g. without domains) might be required. */
2284
2285 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2286 return ERROR;
2287
2288 return OK;
2289 }
2290
2291
2292 static void
2293 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2294 {
2295 uschar * p = sx->buffer;
2296 *p = 0;
2297
2298 /* Add any DSN flags to the rcpt command */
2299
2300 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2301 {
2302 if (addr->dsn_flags & rf_dsnflags)
2303 {
2304 int i;
2305 BOOL first = TRUE;
2306
2307 Ustrcpy(p, " NOTIFY=");
2308 while (*p) p++;
2309 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2310 {
2311 if (!first) *p++ = ',';
2312 first = FALSE;
2313 Ustrcpy(p, rf_names[i]);
2314 while (*p) p++;
2315 }
2316 }
2317
2318 if (addr->dsn_orcpt)
2319 {
2320 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2321 addr->dsn_orcpt);
2322 while (*p) p++;
2323 }
2324 }
2325 }
2326
2327
2328
2329 /*
2330 Return:
2331 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2332 -1 MAIL response error
2333 -2 any non-MAIL read i/o error
2334 -3 non-MAIL response timeout
2335 -4 internal error; channel still usable
2336 -5 transmit failed
2337 */
2338
2339 int
2340 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2341 {
2342 address_item * addr;
2343 int address_count;
2344 int rc;
2345
2346 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2347 {
2348 *yield = ERROR;
2349 return -4;
2350 }
2351
2352 /* From here until we send the DATA command, we can make use of PIPELINING
2353 if the server host supports it. The code has to be able to check the responses
2354 at any point, for when the buffer fills up, so we write it totally generally.
2355 When PIPELINING is off, each command written reports that it has flushed the
2356 buffer. */
2357
2358 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2359
2360 {
2361 uschar * s = sx->from_addr;
2362 #ifdef SUPPORT_I18N
2363 uschar * errstr = NULL;
2364
2365 /* If we must downconvert, do the from-address here. Remember we had to
2366 for the to-addresses (done below), and also (ugly) for re-doing when building
2367 the delivery log line. */
2368
2369 if ( sx->addrlist->prop.utf8_msg
2370 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2371 )
2372 {
2373 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2374 {
2375 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2376 *yield = ERROR;
2377 return -4;
2378 }
2379 setflag(sx->addrlist, af_utf8_downcvt);
2380 }
2381 #endif
2382
2383 rc = smtp_write_command(&sx->outblock, pipelining_active,
2384 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2385 }
2386
2387 mail_command = string_copy(big_buffer); /* Save for later error message */
2388
2389 switch(rc)
2390 {
2391 case -1: /* Transmission error */
2392 return -5;
2393
2394 case +1: /* Cmd was sent */
2395 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2396 sx->ob->command_timeout))
2397 {
2398 if (errno == 0 && sx->buffer[0] == '4')
2399 {
2400 errno = ERRNO_MAIL4XX;
2401 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2402 }
2403 return -1;
2404 }
2405 sx->pending_MAIL = FALSE;
2406 break;
2407
2408 /* otherwise zero: command queued for pipeline */
2409 }
2410
2411 /* Pass over all the relevant recipient addresses for this host, which are the
2412 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2413 several before we have to read the responses for those seen so far. This
2414 checking is done by a subroutine because it also needs to be done at the end.
2415 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2416 the next one if not all are sent.
2417
2418 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2419 last address because we want to abort if any recipients have any kind of
2420 problem, temporary or permanent. We know that all recipient addresses will have
2421 the PENDING_DEFER status, because only one attempt is ever made, and we know
2422 that max_rcpt will be large, so all addresses will be done at once.
2423
2424 For verify we flush the pipeline after any (the only) rcpt address. */
2425
2426 for (addr = sx->first_addr, address_count = 0;
2427 addr && address_count < sx->max_rcpt;
2428 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2429 {
2430 int count;
2431 BOOL no_flush;
2432 uschar * rcpt_addr;
2433
2434 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2435 ? dsn_support_yes : dsn_support_no;
2436
2437 address_count++;
2438 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
2439
2440 build_rcptcmd_options(sx, addr);
2441
2442 /* Now send the RCPT command, and process outstanding responses when
2443 necessary. After a timeout on RCPT, we just end the function, leaving the
2444 yield as OK, because this error can often mean that there is a problem with
2445 just one address, so we don't want to delay the host. */
2446
2447 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2448
2449 #ifdef SUPPORT_I18N
2450 if ( testflag(sx->addrlist, af_utf8_downcvt)
2451 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2452 )
2453 {
2454 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2455 errno = ERRNO_EXPANDFAIL;
2456 return -5; /*XXX too harsh? */
2457 }
2458 #endif
2459
2460 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2461 rcpt_addr, sx->igquotstr, sx->buffer);
2462
2463 if (count < 0) return -5;
2464 if (count > 0)
2465 {
2466 switch(sync_responses(sx, count, 0))
2467 {
2468 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2469 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2470 break;
2471
2472 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2473 if (!sx->lmtp) /* can't tell about progress yet */
2474 sx->completed_addr = TRUE;
2475 case 0: /* No 2xx or 5xx, but no probs */
2476 break;
2477
2478 case -1: return -3; /* Timeout on RCPT */
2479 case -2: return -2; /* non-MAIL read i/o error */
2480 default: return -1; /* any MAIL error */
2481 }
2482 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2483 }
2484 } /* Loop for next address */
2485
2486 sx->next_addr = addr;
2487 return 0;
2488 }
2489
2490
2491 /*************************************************
2492 * Deliver address list to given host *
2493 *************************************************/
2494
2495 /* If continue_hostname is not null, we get here only when continuing to
2496 deliver down an existing channel. The channel was passed as the standard
2497 input. TLS is never active on a passed channel; the previous process always
2498 closes it down before passing the connection on.
2499
2500 Otherwise, we have to make a connection to the remote host, and do the
2501 initial protocol exchange.
2502
2503 When running as an MUA wrapper, if the sender or any recipient is rejected,
2504 temporarily or permanently, we force failure for all recipients.
2505
2506 Arguments:
2507 addrlist chain of potential addresses to deliver; only those whose
2508 transport_return field is set to PENDING_DEFER are currently
2509 being processed; others should be skipped - they have either
2510 been delivered to an earlier host or IP address, or been
2511 failed by one of them.
2512 host host to deliver to
2513 host_af AF_INET or AF_INET6
2514 port default TCP/IP port to use, in host byte order
2515 interface interface to bind to, or NULL
2516 tblock transport instance block
2517 message_defer set TRUE if yield is OK, but all addresses were deferred
2518 because of a non-recipient, non-host failure, that is, a
2519 4xx response to MAIL FROM, DATA, or ".". This is a defer
2520 that is specific to the message.
2521 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2522 a second attempt after TLS initialization fails
2523
2524 Returns: OK - the connection was made and the delivery attempted;
2525 the result for each address is in its data block.
2526 DEFER - the connection could not be made, or something failed
2527 while setting up the SMTP session, or there was a
2528 non-message-specific error, such as a timeout.
2529 ERROR - a filter command is specified for this transport,
2530 and there was a problem setting it up; OR helo_data
2531 or add_headers or authenticated_sender is specified
2532 for this transport, and the string failed to expand
2533 */
2534
2535 static int
2536 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2537 uschar *interface, transport_instance *tblock,
2538 BOOL *message_defer, BOOL suppress_tls)
2539 {
2540 address_item *addr;
2541 int yield = OK;
2542 int save_errno;
2543 int rc;
2544 time_t start_delivery_time = time(NULL);
2545
2546 BOOL pass_message = FALSE;
2547 uschar *message = NULL;
2548 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2549 uschar *p;
2550
2551 smtp_context sx;
2552
2553 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2554 *message_defer = FALSE;
2555
2556 sx.addrlist = addrlist;
2557 sx.host = host;
2558 sx.host_af = host_af,
2559 sx.port = port;
2560 sx.interface = interface;
2561 sx.helo_data = NULL;
2562 sx.tblock = tblock;
2563 sx.verify = FALSE;
2564
2565 /* Get the channel set up ready for a message (MAIL FROM being the next
2566 SMTP command to send */
2567
2568 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2569 return rc;
2570
2571 /* If there is a filter command specified for this transport, we can now
2572 set it up. This cannot be done until the identify of the host is known. */
2573
2574 if (tblock->filter_command)
2575 {
2576 BOOL rc;
2577 uschar fbuf[64];
2578 sprintf(CS fbuf, "%.50s transport", tblock->name);
2579 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2580 TRUE, DEFER, addrlist, fbuf, NULL);
2581 transport_filter_timeout = tblock->filter_timeout;
2582
2583 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2584 yield ERROR. */
2585
2586 if (!rc)
2587 {
2588 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2589 FALSE);
2590 yield = ERROR;
2591 goto SEND_QUIT;
2592 }
2593
2594 if ( transport_filter_argv
2595 && *transport_filter_argv
2596 && **transport_filter_argv
2597 && sx.peer_offered & PEER_OFFERED_CHUNKING
2598 )
2599 {
2600 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2601 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2602 }
2603 }
2604
2605
2606 /* For messages that have more than the maximum number of envelope recipients,
2607 we want to send several transactions down the same SMTP connection. (See
2608 comments in deliver.c as to how this reconciles, heuristically, with
2609 remote_max_parallel.) This optimization was added to Exim after the following
2610 code was already working. The simplest way to put it in without disturbing the
2611 code was to use a goto to jump back to this point when there is another
2612 transaction to handle. */
2613
2614 SEND_MESSAGE:
2615 sx.from_addr = return_path;
2616 sx.first_addr = sx.sync_addr = addrlist;
2617 sx.ok = FALSE;
2618 sx.send_rset = TRUE;
2619 sx.completed_addr = FALSE;
2620
2621
2622 /* Initiate a message transfer. */
2623
2624 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2625 {
2626 case 0: break;
2627 case -1: case -2: goto RESPONSE_FAILED;
2628 case -3: goto END_OFF;
2629 case -4: goto SEND_QUIT;
2630 default: goto SEND_FAILED;
2631 }
2632
2633 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2634 permanently or temporarily. We should have flushed and synced after the last
2635 RCPT. */
2636
2637 if (mua_wrapper)
2638 {
2639 address_item *badaddr;
2640 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2641 if (badaddr->transport_return != PENDING_OK)
2642 {
2643 /*XXX could we find a better errno than 0 here? */
2644 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2645 testflag(badaddr, af_pass_message));
2646 sx.ok = FALSE;
2647 break;
2648 }
2649 }
2650
2651 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2652 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2653 have a good recipient buffered up if we are pipelining. We don't want to waste
2654 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2655 are pipelining. The responses are all handled by sync_responses().
2656 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2657 to send is. */
2658
2659 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2660 && (sx.ok || (pipelining_active && !mua_wrapper)))
2661 {
2662 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2663
2664 if (count < 0) goto SEND_FAILED;
2665 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2666 {
2667 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2668 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2669 break;
2670
2671 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2672 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2673 case 0: break; /* No 2xx or 5xx, but no probs */
2674
2675 case -1: goto END_OFF; /* Timeout on RCPT */
2676 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2677 }
2678 pipelining_active = FALSE;
2679 data_command = string_copy(big_buffer); /* Save for later error message */
2680 }
2681
2682 /* If there were no good recipients (but otherwise there have been no
2683 problems), just set ok TRUE, since we have handled address-specific errors
2684 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2685 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2686 well as body. Set the appropriate timeout value to be used for each chunk.
2687 (Haven't been able to make it work using select() for writing yet.) */
2688
2689 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2690 {
2691 /* Save the first address of the next batch. */
2692 sx.first_addr = sx.next_addr;
2693
2694 sx.ok = TRUE;
2695 }
2696 else
2697 {
2698 transport_ctx tctx = {
2699 tblock,
2700 addrlist,
2701 US".", US"..", /* Escaping strings */
2702 topt_use_crlf | topt_escape_headers
2703 | (tblock->body_only ? topt_no_headers : 0)
2704 | (tblock->headers_only ? topt_no_body : 0)
2705 | (tblock->return_path_add ? topt_add_return_path : 0)
2706 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2707 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2708 };
2709
2710 /* If using CHUNKING we need a callback from the generic transport
2711 support to us, for the sending of BDAT smtp commands and the reaping
2712 of responses. The callback needs a whole bunch of state so set up
2713 a transport-context structure to be passed around. */
2714
2715 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2716 {
2717 tctx.check_string = tctx.escape_string = NULL;
2718 tctx.options |= topt_use_bdat;
2719 tctx.chunk_cb = smtp_chunk_cmd_callback;
2720 sx.pending_BDAT = FALSE;
2721 sx.good_RCPT = sx.ok;
2722 sx.cmd_count = 0;
2723 tctx.smtp_context = &sx;
2724 }
2725 else
2726 tctx.options |= topt_end_dot;
2727
2728 /* Save the first address of the next batch. */
2729 sx.first_addr = sx.next_addr;
2730
2731 /* Responses from CHUNKING commands go in buffer. Otherwise,
2732 there has not been a response. */
2733
2734 sx.buffer[0] = 0;
2735
2736 sigalrm_seen = FALSE;
2737 transport_write_timeout = sx.ob->data_timeout;
2738 smtp_command = US"sending data block"; /* For error messages */
2739 DEBUG(D_transport|D_v)
2740 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2741 debug_printf(" will write message using CHUNKING\n");
2742 else
2743 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2744 transport_count = 0;
2745
2746 #ifndef DISABLE_DKIM
2747 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2748 #else
2749 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2750 #endif
2751
2752 /* transport_write_message() uses write() because it is called from other
2753 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2754 it can exit with "Broken pipe" as its error. This really means that the
2755 socket got closed at the far end. */
2756
2757 transport_write_timeout = 0; /* for subsequent transports */
2758
2759 /* Failure can either be some kind of I/O disaster (including timeout),
2760 or the failure of a transport filter or the expansion of added headers.
2761 Or, when CHUNKING, it can be a protocol-detected failure. */
2762
2763 if (!sx.ok)
2764 goto RESPONSE_FAILED;
2765
2766 /* We used to send the terminating "." explicitly here, but because of
2767 buffering effects at both ends of TCP/IP connections, you don't gain
2768 anything by keeping it separate, so it might as well go in the final
2769 data buffer for efficiency. This is now done by setting the topt_end_dot
2770 flag above. */
2771
2772 smtp_command = US"end of data";
2773
2774 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2775 {
2776 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2777 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2778 {
2779 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2780 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2781 break;
2782
2783 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2784 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2785 case 0: break; /* No 2xx or 5xx, but no probs */
2786
2787 case -1: goto END_OFF; /* Timeout on RCPT */
2788 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2789 }
2790 }
2791
2792 #ifndef DISABLE_PRDR
2793 /* For PRDR we optionally get a partial-responses warning
2794 * followed by the individual responses, before going on with
2795 * the overall response. If we don't get the warning then deal
2796 * with per non-PRDR. */
2797 if(sx.prdr_active)
2798 {
2799 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2800 sx.ob->final_timeout);
2801 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2802 {
2803 case '2': sx.prdr_active = FALSE;
2804 sx.ok = TRUE;
2805 break;
2806 case '4': errno = ERRNO_DATA4XX;
2807 addrlist->more_errno |=
2808 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2809 break;
2810 }
2811 }
2812 else
2813 #endif
2814
2815 /* For non-PRDR SMTP, we now read a single response that applies to the
2816 whole message. If it is OK, then all the addresses have been delivered. */
2817
2818 if (!sx.lmtp)
2819 {
2820 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2821 sx.ob->final_timeout);
2822 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2823 {
2824 errno = ERRNO_DATA4XX;
2825 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2826 }
2827 }
2828
2829 /* For LMTP, we get back a response for every RCPT command that we sent;
2830 some may be accepted and some rejected. For those that get a response, their
2831 status is fixed; any that are accepted have been handed over, even if later
2832 responses crash - at least, that's how I read RFC 2033.
2833
2834 If all went well, mark the recipient addresses as completed, record which
2835 host/IPaddress they were delivered to, and cut out RSET when sending another
2836 message down the same channel. Write the completed addresses to the journal
2837 now so that they are recorded in case there is a crash of hardware or
2838 software before the spool gets updated. Also record the final SMTP
2839 confirmation if needed (for SMTP only). */
2840
2841 if (sx.ok)
2842 {
2843 int flag = '=';
2844 int delivery_time = (int)(time(NULL) - start_delivery_time);
2845 int len;
2846 uschar *conf = NULL;
2847
2848 sx.send_rset = FALSE;
2849 pipelining_active = FALSE;
2850
2851 /* Set up confirmation if needed - applies only to SMTP */
2852
2853 if (
2854 #ifdef DISABLE_EVENT
2855 LOGGING(smtp_confirmation) &&
2856 #endif
2857 !sx.lmtp
2858 )
2859 {
2860 const uschar *s = string_printing(sx.buffer);
2861 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2862 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2863 }
2864
2865 /* Process all transported addresses - for LMTP or PRDR, read a status for
2866 each one. */
2867
2868 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2869 {
2870 if (addr->transport_return != PENDING_OK) continue;
2871
2872 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2873 remaining addresses. Otherwise, it's a return code for just the one
2874 address. For temporary errors, add a retry item for the address so that
2875 it doesn't get tried again too soon. */
2876
2877 #ifndef DISABLE_PRDR
2878 if (sx.lmtp || sx.prdr_active)
2879 #else
2880 if (sx.lmtp)
2881 #endif
2882 {
2883 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2884 sx.ob->final_timeout))
2885 {
2886 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2887 addr->message = string_sprintf(
2888 #ifndef DISABLE_PRDR
2889 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2890 #else
2891 "LMTP error after %s: %s",
2892 #endif
2893 data_command, string_printing(sx.buffer));
2894 setflag(addr, af_pass_message); /* Allow message to go to user */
2895 if (sx.buffer[0] == '5')
2896 addr->transport_return = FAIL;
2897 else
2898 {
2899 errno = ERRNO_DATA4XX;
2900 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2901 addr->transport_return = DEFER;
2902 #ifndef DISABLE_PRDR
2903 if (!sx.prdr_active)
2904 #endif
2905 retry_add_item(addr, addr->address_retry_key, 0);
2906 }
2907 continue;
2908 }
2909 sx.completed_addr = TRUE; /* NOW we can set this flag */
2910 if (LOGGING(smtp_confirmation))
2911 {
2912 const uschar *s = string_printing(sx.buffer);
2913 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2914 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2915 }
2916 }
2917
2918 /* SMTP, or success return from LMTP for this address. Pass back the
2919 actual host that was used. */
2920
2921 addr->transport_return = OK;
2922 addr->more_errno = delivery_time;
2923 addr->host_used = host;
2924 addr->special_action = flag;
2925 addr->message = conf;
2926 #ifndef DISABLE_PRDR
2927 if (sx.prdr_active) addr->flags |= af_prdr_used;
2928 #endif
2929 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2930 flag = '-';
2931
2932 #ifndef DISABLE_PRDR
2933 if (!sx.prdr_active)
2934 #endif
2935 {
2936 /* Update the journal. For homonymic addresses, use the base address plus
2937 the transport name. See lots of comments in deliver.c about the reasons
2938 for the complications when homonyms are involved. Just carry on after
2939 write error, as it may prove possible to update the spool file later. */
2940
2941 if (testflag(addr, af_homonym))
2942 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2943 else
2944 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2945
2946 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2947 len = Ustrlen(CS sx.buffer);
2948 if (write(journal_fd, sx.buffer, len) != len)
2949 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2950 "%s: %s", sx.buffer, strerror(errno));
2951 }
2952 }
2953
2954 #ifndef DISABLE_PRDR
2955 if (sx.prdr_active)
2956 {
2957 /* PRDR - get the final, overall response. For any non-success
2958 upgrade all the address statuses. */
2959 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2960 sx.ob->final_timeout);
2961 if (!sx.ok)
2962 {
2963 if(errno == 0 && sx.buffer[0] == '4')
2964 {
2965 errno = ERRNO_DATA4XX;
2966 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2967 }
2968 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2969 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2970 addr->transport_return = PENDING_OK; /* allow set_errno action */
2971 goto RESPONSE_FAILED;
2972 }
2973
2974 /* Update the journal, or setup retry. */
2975 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2976 if (addr->transport_return == OK)
2977 {
2978 if (testflag(addr, af_homonym))
2979 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2980 else
2981 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2982
2983 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
2984 len = Ustrlen(CS sx.buffer);
2985 if (write(journal_fd, sx.buffer, len) != len)
2986 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2987 "%s: %s", sx.buffer, strerror(errno));
2988 }
2989 else if (addr->transport_return == DEFER)
2990 retry_add_item(addr, addr->address_retry_key, -2);
2991 }
2992 #endif
2993
2994 /* Ensure the journal file is pushed out to disk. */
2995
2996 if (EXIMfsync(journal_fd) < 0)
2997 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2998 strerror(errno));
2999 }
3000 }
3001
3002
3003 /* Handle general (not specific to one address) failures here. The value of ok
3004 is used to skip over this code on the falling through case. A timeout causes a
3005 deferral. Other errors may defer or fail according to the response code, and
3006 may set up a special errno value, e.g. after connection chopped, which is
3007 assumed if errno == 0 and there is no text in the buffer. If control reaches
3008 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3009 the problem is not related to this specific message. */
3010
3011 if (!sx.ok)
3012 {
3013 int code, set_rc;
3014 uschar * set_message;
3015
3016 RESPONSE_FAILED:
3017 {
3018 save_errno = errno;
3019 message = NULL;
3020 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3021 sx.buffer, &code, &message, &pass_message);
3022 goto FAILED;
3023 }
3024
3025 SEND_FAILED:
3026 {
3027 save_errno = errno;
3028 code = '4';
3029 message = US string_sprintf("send() to %s [%s] failed: %s",
3030 host->name, host->address, strerror(save_errno));
3031 sx.send_quit = FALSE;
3032 goto FAILED;
3033 }
3034
3035 FAILED:
3036 {
3037 BOOL message_error;
3038
3039 sx.ok = FALSE; /* For when reached by GOTO */
3040 set_message = message;
3041
3042 /* We want to handle timeouts after MAIL or "." and loss of connection after
3043 "." specially. They can indicate a problem with the sender address or with
3044 the contents of the message rather than a real error on the connection. These
3045 cases are treated in the same way as a 4xx response. This next bit of code
3046 does the classification. */
3047
3048 switch(save_errno)
3049 {
3050 case 0:
3051 case ERRNO_MAIL4XX:
3052 case ERRNO_DATA4XX:
3053 message_error = TRUE;
3054 break;
3055
3056 case ETIMEDOUT:
3057 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3058 Ustrncmp(smtp_command,"end ",4) == 0;
3059 break;
3060
3061 case ERRNO_SMTPCLOSED:
3062 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3063 break;
3064
3065 default:
3066 message_error = FALSE;
3067 break;
3068 }
3069
3070 /* Handle the cases that are treated as message errors. These are:
3071
3072 (a) negative response or timeout after MAIL
3073 (b) negative response after DATA
3074 (c) negative response or timeout or dropped connection after "."
3075 (d) utf8 support required and not offered
3076
3077 It won't be a negative response or timeout after RCPT, as that is dealt
3078 with separately above. The action in all cases is to set an appropriate
3079 error code for all the addresses, but to leave yield set to OK because the
3080 host itself has not failed. Of course, it might in practice have failed
3081 when we've had a timeout, but if so, we'll discover that at the next
3082 delivery attempt. For a temporary error, set the message_defer flag, and
3083 write to the logs for information if this is not the last host. The error
3084 for the last host will be logged as part of the address's log line. */
3085
3086 if (message_error)
3087 {
3088 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3089
3090 /* If there's an errno, the message contains just the identity of
3091 the host. */
3092
3093 if (code == '5')
3094 set_rc = FAIL;
3095 else /* Anything other than 5 is treated as temporary */
3096 {
3097 set_rc = DEFER;
3098 if (save_errno > 0)
3099 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3100 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3101 msglog_line(host, message);
3102 *message_defer = TRUE;
3103 }
3104 }
3105
3106 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3107 ".", or some other transportation error. We defer all addresses and yield
3108 DEFER, except for the case of failed add_headers expansion, or a transport
3109 filter failure, when the yield should be ERROR, to stop it trying other
3110 hosts. */
3111
3112 else
3113 {
3114 set_rc = DEFER;
3115 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3116 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3117 }
3118 }
3119
3120 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3121 #ifdef EXPERIMENTAL_DSN_INFO
3122 , sx.smtp_greeting, sx.helo_response
3123 #endif
3124 );
3125 }
3126
3127
3128 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3129 SMTP session tidily. However, if there were too many addresses to send in one
3130 message (indicated by first_addr being non-NULL) we want to carry on with the
3131 rest of them. Also, it is desirable to send more than one message down the SMTP
3132 connection if there are several waiting, provided we haven't already sent so
3133 many as to hit the configured limit. The function transport_check_waiting looks
3134 for a waiting message and returns its id. Then transport_pass_socket tries to
3135 set up a continued delivery by passing the socket on to another process. The
3136 variable send_rset is FALSE if a message has just been successfully transfered.
3137
3138 If we are already sending down a continued channel, there may be further
3139 addresses not yet delivered that are aimed at the same host, but which have not
3140 been passed in this run of the transport. In this case, continue_more will be
3141 true, and all we should do is send RSET if necessary, and return, leaving the
3142 channel open.
3143
3144 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3145 do not want to continue with other messages down the same channel, because that
3146 can lead to looping between two or more messages, all with the same,
3147 temporarily failing address(es). [The retry information isn't updated yet, so
3148 new processes keep on trying.] We probably also don't want to try more of this
3149 message's addresses either.
3150
3151 If we have started a TLS session, we have to end it before passing the
3152 connection to a new process. However, not all servers can handle this (Exim
3153 can), so we do not pass such a connection on if the host matches
3154 hosts_nopass_tls. */
3155
3156 DEBUG(D_transport)
3157 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3158 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3159 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3160
3161 if (sx.completed_addr && sx.ok && sx.send_quit)
3162 {
3163 BOOL more;
3164 smtp_compare_t t_compare;
3165
3166 t_compare.tblock = tblock;
3167 t_compare.current_sender_address = sender_address;
3168
3169 if ( sx.first_addr != NULL
3170 || continue_more
3171 || ( ( tls_out.active < 0
3172 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3173 )
3174 &&
3175 transport_check_waiting(tblock->name, host->name,
3176 tblock->connection_max_messages, new_message_id, &more,
3177 (oicf)smtp_are_same_identities, (void*)&t_compare)
3178 ) )
3179 {
3180 uschar *msg;
3181 BOOL pass_message;
3182
3183 if (sx.send_rset)
3184 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3185 {
3186 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3187 host->address, strerror(errno));
3188 sx.send_quit = FALSE;
3189 }
3190 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3191 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3192 {
3193 int code;
3194 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3195 &pass_message);
3196 if (!sx.send_quit)
3197 {
3198 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3199 host->name, host->address, msg);
3200 }
3201 }
3202
3203 /* Either RSET was not needed, or it succeeded */
3204
3205 if (sx.ok)
3206 {
3207 if (sx.first_addr != NULL) /* More addresses still to be sent */
3208 { /* in this run of the transport */
3209 continue_sequence++; /* Causes * in logging */
3210 goto SEND_MESSAGE;
3211 }
3212 if (continue_more) return yield; /* More addresses for another run */
3213
3214 /* Pass the socket to a new Exim process. Before doing so, we must shut
3215 down TLS. Not all MTAs allow for the continuation of the SMTP session
3216 when TLS is shut down. We test for this by sending a new EHLO. If we
3217 don't get a good response, we don't attempt to pass the socket on. */
3218
3219 #ifdef SUPPORT_TLS
3220 if (tls_out.active >= 0)
3221 {
3222 tls_close(FALSE, TRUE);
3223 smtp_peer_options = smtp_peer_options_wrap;
3224 sx.ok = !sx.smtps
3225 && smtp_write_command(&sx.outblock, FALSE,
3226 "EHLO %s\r\n", sx.helo_data) >= 0
3227 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3228 '2', sx.ob->command_timeout);
3229 }
3230 #endif
3231
3232 /* If the socket is successfully passed, we mustn't send QUIT (or
3233 indeed anything!) from here. */
3234
3235 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3236 propagate it from the initial
3237 */
3238 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3239 host->address, new_message_id, sx.inblock.sock))
3240 sx.send_quit = FALSE;
3241 }
3242
3243 /* If RSET failed and there are addresses left, they get deferred. */
3244
3245 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3246 #ifdef EXPERIMENTAL_DSN_INFO
3247 , sx.smtp_greeting, sx.helo_response
3248 #endif
3249 );
3250 }
3251 }
3252
3253 /* End off tidily with QUIT unless the connection has died or the socket has
3254 been passed to another process. There has been discussion on the net about what
3255 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3256 to wait for a response, but on the other hand, there isn't anything one can do
3257 with an error response, other than log it. Exim used to do that. However,
3258 further discussion suggested that it is positively advantageous not to wait for
3259 the response, but to close the session immediately. This is supposed to move
3260 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3261 load from the server. (Hosts that are both servers and clients may not see much
3262 difference, of course.) Further discussion indicated that this was safe to do
3263 on Unix systems which have decent implementations of TCP/IP that leave the
3264 connection around for a while (TIME_WAIT) after the application has gone away.
3265 This enables the response sent by the server to be properly ACKed rather than
3266 timed out, as can happen on broken TCP/IP implementations on other OS.
3267
3268 This change is being made on 31-Jul-98. After over a year of trouble-free
3269 operation, the old commented-out code was removed on 17-Sep-99. */
3270
3271 SEND_QUIT:
3272 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3273
3274 END_OFF:
3275
3276 #ifdef SUPPORT_TLS
3277 tls_close(FALSE, TRUE);
3278 #endif
3279
3280 /* Close the socket, and return the appropriate value, first setting
3281 works because the NULL setting is passed back to the calling process, and
3282 remote_max_parallel is forced to 1 when delivering over an existing connection,
3283
3284 If all went well and continue_more is set, we shouldn't actually get here if
3285 there are further addresses, as the return above will be taken. However,
3286 writing RSET might have failed, or there may be other addresses whose hosts are
3287 specified in the transports, and therefore not visible at top level, in which
3288 case continue_more won't get set. */
3289
3290 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3291 if (sx.send_quit)
3292 {
3293 shutdown(sx.outblock.sock, SHUT_WR);
3294 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3295 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3296 rc--; /* drain socket */
3297 }
3298 (void)close(sx.inblock.sock);
3299
3300 #ifndef DISABLE_EVENT
3301 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3302 #endif
3303
3304 continue_transport = NULL;
3305 continue_hostname = NULL;
3306 return yield;
3307 }
3308
3309
3310
3311
3312 /*************************************************
3313 * Closedown entry point *
3314 *************************************************/
3315
3316 /* This function is called when exim is passed an open smtp channel
3317 from another incarnation, but the message which it has been asked
3318 to deliver no longer exists. The channel is on stdin.
3319
3320 We might do fancy things like looking for another message to send down
3321 the channel, but if the one we sought has gone, it has probably been
3322 delivered by some other process that itself will seek further messages,
3323 so just close down our connection.
3324
3325 Argument: pointer to the transport instance block
3326 Returns: nothing
3327 */
3328
3329 void
3330 smtp_transport_closedown(transport_instance *tblock)
3331 {
3332 smtp_transport_options_block *ob =
3333 (smtp_transport_options_block *)tblock->options_block;
3334 smtp_inblock inblock;
3335 smtp_outblock outblock;
3336 uschar buffer[256];
3337 uschar inbuffer[4096];
3338 uschar outbuffer[16];
3339
3340 inblock.sock = fileno(stdin);
3341 inblock.buffer = inbuffer;
3342 inblock.buffersize = sizeof(inbuffer);
3343 inblock.ptr = inbuffer;
3344 inblock.ptrend = inbuffer;
3345
3346 outblock.sock = inblock.sock;
3347 outblock.buffersize = sizeof(outbuffer);
3348 outblock.buffer = outbuffer;
3349 outblock.ptr = outbuffer;
3350 outblock.cmd_count = 0;
3351 outblock.authenticating = FALSE;
3352
3353 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3354 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3355 ob->command_timeout);
3356 (void)close(inblock.sock);
3357 }
3358
3359
3360
3361 /*************************************************
3362 * Prepare addresses for delivery *
3363 *************************************************/
3364
3365 /* This function is called to flush out error settings from previous delivery
3366 attempts to other hosts. It also records whether we got here via an MX record
3367 or not in the more_errno field of the address. We are interested only in
3368 addresses that are still marked DEFER - others may have got delivered to a
3369 previously considered IP address. Set their status to PENDING_DEFER to indicate
3370 which ones are relevant this time.
3371
3372 Arguments:
3373 addrlist the list of addresses
3374 host the host we are delivering to
3375
3376 Returns: the first address for this delivery
3377 */
3378
3379 static address_item *
3380 prepare_addresses(address_item *addrlist, host_item *host)
3381 {
3382 address_item *first_addr = NULL;
3383 address_item *addr;
3384 for (addr = addrlist; addr; addr = addr->next)
3385 if (addr->transport_return == DEFER)
3386 {
3387 if (!first_addr) first_addr = addr;
3388 addr->transport_return = PENDING_DEFER;
3389 addr->basic_errno = 0;
3390 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3391 addr->message = NULL;
3392 #ifdef SUPPORT_TLS
3393 addr->cipher = NULL;
3394 addr->ourcert = NULL;
3395 addr->peercert = NULL;
3396 addr->peerdn = NULL;
3397 addr->ocsp = OCSP_NOT_REQ;
3398 #endif
3399 #ifdef EXPERIMENTAL_DSN_INFO
3400 addr->smtp_greeting = NULL;
3401 addr->helo_response = NULL;
3402 #endif
3403 }
3404 return first_addr;
3405 }
3406
3407
3408
3409 /*************************************************
3410 * Main entry point *
3411 *************************************************/
3412
3413 /* See local README for interface details. As this is a remote transport, it is
3414 given a chain of addresses to be delivered in one connection, if possible. It
3415 always returns TRUE, indicating that each address has its own independent
3416 status set, except if there is a setting up problem, in which case it returns
3417 FALSE. */
3418
3419 BOOL
3420 smtp_transport_entry(
3421 transport_instance *tblock, /* data for this instantiation */
3422 address_item *addrlist) /* addresses we are working on */
3423 {
3424 int cutoff_retry;
3425 int port;
3426 int hosts_defer = 0;
3427 int hosts_fail = 0;
3428 int hosts_looked_up = 0;
3429 int hosts_retry = 0;
3430 int hosts_serial = 0;
3431 int hosts_total = 0;
3432 int total_hosts_tried = 0;
3433 address_item *addr;
3434 BOOL expired = TRUE;
3435 uschar *expanded_hosts = NULL;
3436 uschar *pistring;
3437 uschar *tid = string_sprintf("%s transport", tblock->name);
3438 smtp_transport_options_block *ob =
3439 (smtp_transport_options_block *)(tblock->options_block);
3440 host_item *hostlist = addrlist->host_list;
3441 host_item *host = NULL;
3442
3443 DEBUG(D_transport)
3444 {
3445 debug_printf("%s transport entered\n", tblock->name);
3446 for (addr = addrlist; addr; addr = addr->next)
3447 debug_printf(" %s\n", addr->address);
3448 if (hostlist)
3449 {
3450 debug_printf("hostlist:\n");
3451 for (host = hostlist; host; host = host->next)
3452 debug_printf(" %s:%d\n", host->name, host->port);
3453 }
3454 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3455 continue_hostname, continue_host_address);
3456 }
3457
3458 /* Set the flag requesting that these hosts be added to the waiting
3459 database if the delivery fails temporarily or if we are running with
3460 queue_smtp or a 2-stage queue run. This gets unset for certain
3461 kinds of error, typically those that are specific to the message. */
3462
3463 update_waiting = TRUE;
3464
3465 /* If a host list is not defined for the addresses - they must all have the
3466 same one in order to be passed to a single transport - or if the transport has
3467 a host list with hosts_override set, use the host list supplied with the
3468 transport. It is an error for this not to exist. */
3469
3470 if (!hostlist || (ob->hosts_override && ob->hosts))
3471 {
3472 if (!ob->hosts)
3473 {
3474 addrlist->message = string_sprintf("%s transport called with no hosts set",
3475 tblock->name);
3476 addrlist->transport_return = PANIC;
3477 return FALSE; /* Only top address has status */
3478 }
3479
3480 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3481 ob->hosts);
3482
3483 /* If the transport's host list contains no '$' characters, and we are not
3484 randomizing, it is fixed and therefore a chain of hosts can be built once
3485 and for all, and remembered for subsequent use by other calls to this
3486 transport. If, on the other hand, the host list does contain '$', or we are
3487 randomizing its order, we have to rebuild it each time. In the fixed case,
3488 as the hosts string will never be used again, it doesn't matter that we
3489 replace all the : characters with zeros. */
3490
3491 if (!ob->hostlist)
3492 {
3493 uschar *s = ob->hosts;
3494
3495 if (Ustrchr(s, '$') != NULL)
3496 {
3497 if (!(expanded_hosts = expand_string(s)))
3498 {
3499 addrlist->message = string_sprintf("failed to expand list of hosts "
3500 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3501 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3502 return FALSE; /* Only top address has status */
3503 }
3504 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3505 "\"%s\"\n", s, expanded_hosts);
3506 s = expanded_hosts;
3507 }
3508 else
3509 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3510
3511 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3512
3513 /* Check that the expansion yielded something useful. */
3514 if (!hostlist)
3515 {
3516 addrlist->message =
3517 string_sprintf("%s transport has empty hosts setting", tblock->name);
3518 addrlist->transport_return = PANIC;
3519 return FALSE; /* Only top address has status */
3520 }
3521
3522 /* If there was no expansion of hosts, save the host list for
3523 next time. */
3524
3525 if (!expanded_hosts) ob->hostlist = hostlist;
3526 }
3527
3528 /* This is not the first time this transport has been run in this delivery;
3529 the host list was built previously. */
3530
3531 else
3532 hostlist = ob->hostlist;
3533 }
3534
3535 /* The host list was supplied with the address. If hosts_randomize is set, we
3536 must sort it into a random order if it did not come from MX records and has not
3537 already been randomized (but don't bother if continuing down an existing
3538 connection). */
3539
3540 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3541 {
3542 host_item *newlist = NULL;
3543 while (hostlist)
3544 {
3545 host_item *h = hostlist;
3546 hostlist = hostlist->next;
3547
3548 h->sort_key = random_number(100);
3549
3550 if (!newlist)
3551 {
3552 h->next = NULL;
3553 newlist = h;
3554 }
3555 else if (h->sort_key < newlist->sort_key)
3556 {
3557 h->next = newlist;
3558 newlist = h;
3559 }
3560 else
3561 {
3562 host_item *hh = newlist;
3563 while (hh->next)
3564 {
3565 if (h->sort_key < hh->next->sort_key) break;
3566 hh = hh->next;
3567 }
3568 h->next = hh->next;
3569 hh->next = h;
3570 }
3571 }
3572
3573 hostlist = addrlist->host_list = newlist;
3574 }
3575
3576 /* Sort out the default port. */
3577
3578 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3579
3580 /* For each host-plus-IP-address on the list:
3581
3582 . If this is a continued delivery and the host isn't the one with the
3583 current connection, skip.
3584
3585 . If the status is unusable (i.e. previously failed or retry checked), skip.
3586
3587 . If no IP address set, get the address, either by turning the name into
3588 an address, calling gethostbyname if gethostbyname is on, or by calling
3589 the DNS. The DNS may yield multiple addresses, in which case insert the
3590 extra ones into the list.
3591
3592 . Get the retry data if not previously obtained for this address and set the
3593 field which remembers the state of this address. Skip if the retry time is
3594 not reached. If not, remember whether retry data was found. The retry string
3595 contains both the name and the IP address.
3596
3597 . Scan the list of addresses and mark those whose status is DEFER as
3598 PENDING_DEFER. These are the only ones that will be processed in this cycle
3599 of the hosts loop.
3600
3601 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3602 Some addresses may be successfully delivered, others may fail, and yet
3603 others may get temporary errors and so get marked DEFER.
3604
3605 . The return from the delivery attempt is OK if a connection was made and a
3606 valid SMTP dialogue was completed. Otherwise it is DEFER.
3607
3608 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3609
3610 . If fail to connect, or other defer state, add a retry item.
3611
3612 . If there are any addresses whose status is still DEFER, carry on to the
3613 next host/IPaddress, unless we have tried the number of hosts given
3614 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3615 there is some fancy logic for hosts_max_try that means its limit can be
3616 overstepped in some circumstances.
3617
3618 If we get to the end of the list, all hosts have deferred at least one address,
3619 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3620 delivery attempt to those hosts whose last try was before the arrival time of
3621 the current message. To cope with this, we have to go round the loop a second
3622 time. After that, set the status and error data for any addresses that haven't
3623 had it set already. */
3624
3625 for (cutoff_retry = 0;
3626 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3627 cutoff_retry++)
3628 {
3629 host_item *nexthost = NULL;
3630 int unexpired_hosts_tried = 0;
3631
3632 for (host = hostlist;
3633 host
3634 && unexpired_hosts_tried < ob->hosts_max_try
3635 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3636 host = nexthost)
3637 {
3638 int rc;
3639 int host_af;
3640 uschar *rs;
3641 BOOL host_is_expired = FALSE;
3642 BOOL message_defer = FALSE;
3643 BOOL some_deferred = FALSE;
3644 address_item *first_addr = NULL;
3645 uschar *interface = NULL;
3646 uschar *retry_host_key = NULL;
3647 uschar *retry_message_key = NULL;
3648 uschar *serialize_key = NULL;
3649
3650 /* Default next host is next host. :-) But this can vary if the
3651 hosts_max_try limit is hit (see below). It may also be reset if a host
3652 address is looked up here (in case the host was multihomed). */
3653
3654 nexthost = host->next;
3655
3656 /* If the address hasn't yet been obtained from the host name, look it up
3657 now, unless the host is already marked as unusable. If it is marked as
3658 unusable, it means that the router was unable to find its IP address (in
3659 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3660 the lookup failed last time. We don't get this far if *all* MX records
3661 point to non-existent hosts; that is treated as a hard error.
3662
3663 We can just skip this host entirely. When the hosts came from the router,
3664 the address will timeout based on the other host(s); when the address is
3665 looked up below, there is an explicit retry record added.
3666
3667 Note that we mustn't skip unusable hosts if the address is not unset; they
3668 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3669
3670 if (!host->address)
3671 {
3672 int new_port, flags;
3673 host_item *hh;
3674
3675 if (host->status >= hstatus_unusable)
3676 {
3677 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3678 host->name);
3679 continue;
3680 }
3681
3682 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3683
3684 /* The host name is permitted to have an attached port. Find it, and
3685 strip it from the name. Just remember it for now. */
3686
3687 new_port = host_item_get_port(host);
3688
3689 /* Count hosts looked up */
3690
3691 hosts_looked_up++;
3692
3693 /* Find by name if so configured, or if it's an IP address. We don't
3694 just copy the IP address, because we need the test-for-local to happen. */
3695
3696 flags = HOST_FIND_BY_A;
3697 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3698 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3699
3700 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3701 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3702 else
3703 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3704 &ob->dnssec, /* domains for request/require */
3705 NULL, NULL);
3706
3707 /* Update the host (and any additional blocks, resulting from
3708 multihoming) with a host-specific port, if any. */
3709
3710 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3711
3712 /* Failure to find the host at this time (usually DNS temporary failure)
3713 is really a kind of routing failure rather than a transport failure.
3714 Therefore we add a retry item of the routing kind, not to stop us trying
3715 to look this name up here again, but to ensure the address gets timed
3716 out if the failures go on long enough. A complete failure at this point
3717 commonly points to a configuration error, but the best action is still
3718 to carry on for the next host. */
3719
3720 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3721 {
3722 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3723 expired = FALSE;
3724 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3725 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3726 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3727 host->status = hstatus_unusable;
3728
3729 for (addr = addrlist; addr; addr = addr->next)
3730 {
3731 if (addr->transport_return != DEFER) continue;
3732 addr->basic_errno = ERRNO_UNKNOWNHOST;
3733 addr->message =
3734 string_sprintf("failed to lookup IP address for %s", host->name);
3735 }
3736 continue;
3737 }
3738
3739 /* If the host is actually the local host, we may have a problem, or
3740 there may be some cunning configuration going on. In the problem case,
3741 log things and give up. The default transport status is already DEFER. */
3742
3743 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3744 {
3745 for (addr = addrlist; addr; addr = addr->next)
3746 {
3747 addr->basic_errno = 0;
3748 addr->message = string_sprintf("%s transport found host %s to be "
3749 "local", tblock->name, host->name);
3750 }
3751 goto END_TRANSPORT;
3752 }
3753 } /* End of block for IP address lookup */
3754
3755 /* If this is a continued delivery, we are interested only in the host
3756 which matches the name of the existing open channel. The check is put
3757 here after the local host lookup, in case the name gets expanded as a
3758 result of the lookup. Set expired FALSE, to save the outer loop executing
3759 twice. */
3760
3761 if ( continue_hostname
3762 && ( Ustrcmp(continue_hostname, host->name) != 0
3763 || Ustrcmp(continue_host_address, host->address) != 0
3764 ) )
3765 {
3766 expired = FALSE;
3767 continue; /* With next host */
3768 }
3769
3770 /* Reset the default next host in case a multihomed host whose addresses
3771 are not looked up till just above added to the host list. */
3772
3773 nexthost = host->next;
3774
3775 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3776 domain is in queue_smtp_domains, we don't actually want to attempt any
3777 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3778 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3779 were not in it. We don't want to hold up all SMTP deliveries! Except when
3780 doing a two-stage queue run, don't do this if forcing. */
3781
3782 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3783 match_isinlist(addrlist->domain,
3784 (const uschar **)&queue_smtp_domains, 0,
3785 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3786 {
3787 expired = FALSE;
3788 for (addr = addrlist; addr; addr = addr->next)
3789 if (addr->transport_return == DEFER)
3790 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3791 continue; /* With next host */
3792 }
3793
3794 /* Count hosts being considered - purely for an intelligent comment
3795 if none are usable. */
3796
3797 hosts_total++;
3798
3799 /* Set $host and $host address now in case they are needed for the
3800 interface expansion or the serialize_hosts check; they remain set if an
3801 actual delivery happens. */
3802
3803 deliver_host = host->name;
3804 deliver_host_address = host->address;
3805 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3806 : host->dnssec == DS_NO ? US"no"
3807 : US"";
3808
3809 /* Set up a string for adding to the retry key if the port number is not
3810 the standard SMTP port. A host may have its own port setting that overrides
3811 the default. */
3812
3813 pistring = string_sprintf(":%d", host->port == PORT_NONE
3814 ? port : host->port);
3815 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3816
3817 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3818 string is set, even if constant (as different transports can have different
3819 constant settings), we must add it to the key that is used for retries,
3820 because connections to the same host from a different interface should be
3821 treated separately. */
3822
3823 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3824 if ((rs = ob->interface) && *rs)
3825 {
3826 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3827 return FALSE;
3828 pistring = string_sprintf("%s/%s", pistring, interface);
3829 }
3830
3831 /* The first time round the outer loop, check the status of the host by
3832 inspecting the retry data. The second time round, we are interested only
3833 in expired hosts that haven't been tried since this message arrived. */
3834
3835 if (cutoff_retry == 0)
3836 {
3837 BOOL incl_ip;
3838 /* Ensure the status of the address is set by checking retry data if
3839 necessary. There may be host-specific retry data (applicable to all
3840 messages) and also data for retries of a specific message at this host.
3841 If either of these retry records are actually read, the keys used are
3842 returned to save recomputing them later. */
3843
3844 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3845 US"retry_include_ip_address", ob->retry_include_ip_address,
3846 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3847 continue; /* with next host */
3848
3849 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3850 incl_ip, &retry_host_key, &retry_message_key);
3851
3852 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3853 (host->address == NULL)? US"" : host->address, pistring,
3854 (host->status == hstatus_usable)? "usable" :
3855 (host->status == hstatus_unusable)? "unusable" :
3856 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3857
3858 /* Skip this address if not usable at this time, noting if it wasn't
3859 actually expired, both locally and in the address. */
3860
3861 switch (host->status)
3862 {
3863 case hstatus_unusable:
3864 expired = FALSE;
3865 setflag(addrlist, af_retry_skipped);
3866 /* Fall through */
3867
3868 case hstatus_unusable_expired:
3869 switch (host->why)
3870 {
3871 case hwhy_retry: hosts_retry++; break;
3872 case hwhy_failed: hosts_fail++; break;
3873 case hwhy_deferred: hosts_defer++; break;
3874 }
3875
3876 /* If there was a retry message key, implying that previously there
3877 was a message-specific defer, we don't want to update the list of
3878 messages waiting for these hosts. */
3879
3880 if (retry_message_key) update_waiting = FALSE;
3881 continue; /* With the next host or IP address */
3882 }
3883 }
3884
3885 /* Second time round the loop: if the address is set but expired, and
3886 the message is newer than the last try, let it through. */
3887
3888 else
3889 {
3890 if ( !host->address
3891 || host->status != hstatus_unusable_expired
3892 || host->last_try > received_time)
3893 continue;
3894 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3895 host->name, host->address, pistring);
3896 host_is_expired = TRUE;
3897 }
3898
3899 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3900 it remains TRUE only if all hosts are expired and none are actually tried.
3901 */
3902
3903 expired = FALSE;
3904
3905 /* If this host is listed as one to which access must be serialized,
3906 see if another Exim process has a connection to it, and if so, skip
3907 this host. If not, update the database to record our connection to it
3908 and remember this for later deletion. Do not do any of this if we are
3909 sending the message down a pre-existing connection. */
3910
3911 if ( !continue_hostname
3912 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3913 {
3914 serialize_key = string_sprintf("host-serialize-%s", host->name);
3915 if (!enq_start(serialize_key, 1))
3916 {
3917 DEBUG(D_transport)
3918 debug_printf("skipping host %s because another Exim process "
3919 "is connected to it\n", host->name);
3920 hosts_serial++;
3921 continue;
3922 }
3923 }
3924
3925 /* OK, we have an IP address that is not waiting for its retry time to
3926 arrive (it might be expired) OR (second time round the loop) we have an
3927 expired host that hasn't been tried since the message arrived. Have a go
3928 at delivering the message to it. First prepare the addresses by flushing
3929 out the result of previous attempts, and finding the first address that
3930 is still to be delivered. */
3931
3932 first_addr = prepare_addresses(addrlist, host);
3933
3934 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3935 message_id, host->name, host->address, addrlist->address,
3936 addrlist->next ? ", ..." : "");
3937
3938 set_process_info("delivering %s to %s [%s] (%s%s)",
3939 message_id, host->name, host->address, addrlist->address,
3940 addrlist->next ? ", ..." : "");
3941
3942 /* This is not for real; don't do the delivery. If there are
3943 any remaining hosts, list them. */
3944
3945 if (dont_deliver)
3946 {
3947 host_item *host2;
3948 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3949 for (addr = addrlist; addr; addr = addr->next)
3950 {
3951 addr->host_used = host;
3952 addr->special_action = '*';
3953 addr->message = US"delivery bypassed by -N option";
3954 }
3955 DEBUG(D_transport)
3956 {
3957 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3958 "*** host and remaining hosts:\n", tblock->name);
3959 for (host2 = host; host2; host2 = host2->next)
3960 debug_printf(" %s [%s]\n", host2->name,
3961 host2->address ? host2->address : US"unset");
3962 }
3963 rc = OK;
3964 }
3965
3966 /* This is for real. If the host is expired, we don't count it for
3967 hosts_max_retry. This ensures that all hosts must expire before an address
3968 is timed out, unless hosts_max_try_hardlimit (which protects against
3969 lunatic DNS configurations) is reached.
3970
3971 If the host is not expired and we are about to hit the hosts_max_retry
3972 limit, check to see if there is a subsequent hosts with a different MX
3973 value. If so, make that the next host, and don't count this one. This is a
3974 heuristic to make sure that different MXs do get tried. With a normal kind
3975 of retry rule, they would get tried anyway when the earlier hosts were
3976 delayed, but if the domain has a "retry every time" type of rule - as is
3977 often used for the the very large ISPs, that won't happen. */
3978
3979 else
3980 {
3981 host_item * thost;
3982 /* Make a copy of the host if it is local to this invocation
3983 of the transport. */
3984
3985 if (expanded_hosts)
3986 {
3987 thost = store_get(sizeof(host_item));
3988 *thost = *host;
3989 thost->name = string_copy(host->name);
3990 thost->address = string_copy(host->address);
3991 }
3992 else
3993 thost = host;
3994
3995 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3996 {
3997 host_item *h;
3998 DEBUG(D_transport)
3999 debug_printf("hosts_max_try limit reached with this host\n");
4000 for (h = host; h; h = h->next) if (h->mx != host->mx)
4001 {
4002 nexthost = h;
4003 unexpired_hosts_tried--;
4004 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4005 "and will be tried\n");
4006 break;
4007 }
4008 }
4009
4010 /* Attempt the delivery. */
4011
4012 total_hosts_tried++;
4013 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4014 &message_defer, FALSE);
4015
4016 /* Yield is one of:
4017 OK => connection made, each address contains its result;
4018 message_defer is set for message-specific defers (when all
4019 recipients are marked defer)
4020 DEFER => there was a non-message-specific delivery problem;
4021 ERROR => there was a problem setting up the arguments for a filter,
4022 or there was a problem with expanding added headers
4023 */
4024
4025 /* If the result is not OK, there was a non-message-specific problem.
4026 If the result is DEFER, we need to write to the logs saying what happened
4027 for this particular host, except in the case of authentication and TLS
4028 failures, where the log has already been written. If all hosts defer a
4029 general message is written at the end. */
4030
4031 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4032 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4033 write_logs(first_addr, host);
4034
4035 #ifndef DISABLE_EVENT
4036 if (rc == DEFER)
4037 deferred_event_raise(first_addr, host);
4038 #endif
4039
4040 /* If STARTTLS was accepted, but there was a failure in setting up the
4041 TLS session (usually a certificate screwup), and the host is not in
4042 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4043 TLS forcibly turned off. We have to start from scratch with a new SMTP
4044 connection. That's why the retry is done from here, not from within
4045 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4046 session, so the in-clear transmission after those errors, if permitted,
4047 happens inside smtp_deliver().] */
4048
4049 #ifdef SUPPORT_TLS
4050 if ( rc == DEFER
4051 && first_addr->basic_errno == ERRNO_TLSFAILURE
4052 && ob->tls_tempfail_tryclear
4053 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4054 )
4055 {
4056 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4057 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4058 first_addr = prepare_addresses(addrlist, host);
4059 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4060 &message_defer, TRUE);
4061 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4062 write_logs(first_addr, host);
4063 # ifndef DISABLE_EVENT
4064 if (rc == DEFER)
4065 deferred_event_raise(first_addr, host);
4066 # endif
4067 }
4068 #endif /*SUPPORT_TLS*/
4069 }
4070
4071 /* Delivery attempt finished */
4072
4073 rs = rc == OK ? US"OK"
4074 : rc == DEFER ? US"DEFER"
4075 : rc == ERROR ? US"ERROR"
4076 : US"?";
4077
4078 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4079 message_id, host->name, host->address, addrlist->address,
4080 addrlist->next ? " (& others)" : "", rs);
4081
4082 /* Release serialization if set up */
4083
4084 if (serialize_key) enq_end(serialize_key);
4085
4086 /* If the result is DEFER, or if a host retry record is known to exist, we
4087 need to add an item to the retry chain for updating the retry database
4088 at the end of delivery. We only need to add the item to the top address,
4089 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4090 for any other delivery attempts using the same address. (It is copied into
4091 the unusable tree at the outer level, so even if different address blocks
4092 contain the same address, it still won't get tried again.) */
4093
4094 if (rc == DEFER || retry_host_key)
4095 {
4096 int delete_flag = rc != DEFER ? rf_delete : 0;
4097 if (!retry_host_key)
4098 {
4099 BOOL incl_ip;
4100 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4101 US"retry_include_ip_address", ob->retry_include_ip_address,
4102 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4103 incl_ip = TRUE; /* error; use most-specific retry record */
4104
4105 retry_host_key = incl_ip
4106 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4107 : string_sprintf("T:%S%s", host->name, pistring);
4108 }
4109
4110 /* If a delivery of another message over an existing SMTP connection
4111 yields DEFER, we do NOT set up retry data for the host. This covers the
4112 case when there are delays in routing the addresses in the second message
4113 that are so long that the server times out. This is alleviated by not
4114 routing addresses that previously had routing defers when handling an
4115 existing connection, but even so, this case may occur (e.g. if a
4116 previously happily routed address starts giving routing defers). If the
4117 host is genuinely down, another non-continued message delivery will
4118 notice it soon enough. */
4119
4120 if (delete_flag != 0 || !continue_hostname)
4121 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4122
4123 /* We may have tried an expired host, if its retry time has come; ensure
4124 the status reflects the expiry for the benefit of any other addresses. */
4125
4126 if (rc == DEFER)
4127 {
4128 host->status = host_is_expired
4129 ? hstatus_unusable_expired : hstatus_unusable;
4130 host->why = hwhy_deferred;
4131 }
4132 }
4133
4134 /* If message_defer is set (host was OK, but every recipient got deferred
4135 because of some message-specific problem), or if that had happened
4136 previously so that a message retry key exists, add an appropriate item
4137 to the retry chain. Note that if there was a message defer but now there is
4138 a host defer, the message defer record gets deleted. That seems perfectly
4139 reasonable. Also, stop the message from being remembered as waiting
4140 for specific hosts. */
4141
4142 if (message_defer || retry_message_key)
4143 {
4144 int delete_flag = message_defer ? 0 : rf_delete;
4145 if (!retry_message_key)
4146 {
4147 BOOL incl_ip;
4148 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4149 US"retry_include_ip_address", ob->retry_include_ip_address,
4150 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4151 incl_ip = TRUE; /* error; use most-specific retry record */
4152
4153 retry_message_key = incl_ip
4154 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4155 message_id)
4156 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4157 }
4158 retry_add_item(addrlist, retry_message_key,
4159 rf_message | rf_host | delete_flag);
4160 update_waiting = FALSE;
4161 }
4162
4163 /* Any return other than DEFER (that is, OK or ERROR) means that the
4164 addresses have got their final statuses filled in for this host. In the OK
4165 case, see if any of them are deferred. */
4166
4167 if (rc == OK)
4168 for (addr = addrlist; addr; addr = addr->next)
4169 if (addr->transport_return == DEFER)
4170 {
4171 some_deferred = TRUE;
4172 break;
4173 }
4174
4175 /* If no addresses deferred or the result was ERROR, return. We do this for
4176 ERROR because a failing filter set-up or add_headers expansion is likely to
4177 fail for any host we try. */
4178
4179 if (rc == ERROR || (rc == OK && !some_deferred))
4180 {
4181 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4182 return TRUE; /* Each address has its status */
4183 }
4184
4185 /* If the result was DEFER or some individual addresses deferred, let
4186 the loop run to try other hosts with the deferred addresses, except for the
4187 case when we were trying to deliver down an existing channel and failed.
4188 Don't try any other hosts in this case. */
4189
4190 if (continue_hostname) break;
4191
4192 /* If the whole delivery, or some individual addresses, were deferred and
4193 there are more hosts that could be tried, do not count this host towards
4194 the hosts_max_try limit if the age of the message is greater than the
4195 maximum retry time for this host. This means we may try try all hosts,
4196 ignoring the limit, when messages have been around for some time. This is
4197 important because if we don't try all hosts, the address will never time
4198 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4199
4200 if ((rc == DEFER || some_deferred) && nexthost)
4201 {
4202 BOOL timedout;
4203 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4204
4205 if (retry && retry->rules)
4206 {
4207 retry_rule *last_rule;
4208 for (last_rule = retry->rules;
4209 last_rule->next;
4210 last_rule = last_rule->next);
4211 timedout = time(NULL) - received_time > last_rule->timeout;
4212 }
4213 else timedout = TRUE; /* No rule => timed out */
4214
4215 if (timedout)
4216 {
4217 unexpired_hosts_tried--;
4218 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4219 "hosts_max_try (message older than host's retry time)\n");
4220 }
4221 }
4222 } /* End of loop for trying multiple hosts. */
4223
4224 /* This is the end of the loop that repeats iff expired is TRUE and
4225 ob->delay_after_cutoff is FALSE. The second time round we will
4226 try those hosts that haven't been tried since the message arrived. */
4227
4228 DEBUG(D_transport)
4229 {
4230 debug_printf("all IP addresses skipped or deferred at least one address\n");
4231 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4232 debug_printf("retrying IP addresses not tried since message arrived\n");
4233 }
4234 }
4235
4236
4237 /* Get here if all IP addresses are skipped or defer at least one address. In
4238 MUA wrapper mode, this will happen only for connection or other non-message-
4239 specific failures. Force the delivery status for all addresses to FAIL. */
4240
4241 if (mua_wrapper)
4242 {
4243 for (addr = addrlist; addr; addr = addr->next)
4244 addr->transport_return = FAIL;
4245 goto END_TRANSPORT;
4246 }
4247
4248 /* In the normal, non-wrapper case, add a standard message to each deferred
4249 address if there hasn't been an error, that is, if it hasn't actually been
4250 tried this time. The variable "expired" will be FALSE if any deliveries were
4251 actually tried, or if there was at least one host that was not expired. That
4252 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4253 a delivery has been tried, an error code will be set, and the failing of the
4254 message is handled by the retry code later.
4255
4256 If queue_smtp is set, or this transport was called to send a subsequent message
4257 down an existing TCP/IP connection, and something caused the host not to be
4258 found, we end up here, but can detect these cases and handle them specially. */
4259
4260 for (addr = addrlist; addr; addr = addr->next)
4261 {
4262 /* If host is not NULL, it means that we stopped processing the host list
4263 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4264 means we need to behave as if some hosts were skipped because their retry
4265 time had not come. Specifically, this prevents the address from timing out.
4266 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4267 hosts were tried. */
4268
4269 if (host)
4270 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4271 {
4272 DEBUG(D_transport)
4273 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4274 "hosts were tried\n");
4275 }
4276 else
4277 {
4278 DEBUG(D_transport)
4279 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4280 setflag(addr, af_retry_skipped);
4281 }
4282
4283 if (queue_smtp) /* no deliveries attempted */
4284 {
4285 addr->transport_return = DEFER;
4286 addr->basic_errno = 0;
4287 addr->message = US"SMTP delivery explicitly queued";
4288 }
4289
4290 else if ( addr->transport_return == DEFER
4291 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4292 && !addr->message
4293 )
4294 {
4295 addr->basic_errno = ERRNO_HRETRY;
4296 if (continue_hostname)
4297 addr->message = US"no host found for existing SMTP connection";
4298 else if (expired)
4299 {
4300 setflag(addr, af_pass_message); /* This is not a security risk */
4301 addr->message = string_sprintf(
4302 "all hosts%s have been failing for a long time %s",
4303 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4304 ob->delay_after_cutoff
4305 ? US"(and retry time not reached)"
4306 : US"and were last tried after this message arrived");
4307
4308 /* If we are already using fallback hosts, or there are no fallback hosts
4309 defined, convert the result to FAIL to cause a bounce. */
4310
4311 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4312 addr->transport_return = FAIL;
4313 }
4314 else
4315 {
4316 const char * s;
4317 if (hosts_retry == hosts_total)
4318 s = "retry time not reached for any host%s";
4319 else if (hosts_fail == hosts_total)
4320 s = "all host address lookups%s failed permanently";
4321 else if (hosts_defer == hosts_total)
4322 s = "all host address lookups%s failed temporarily";
4323 else if (hosts_serial == hosts_total)
4324 s = "connection limit reached for all hosts%s";
4325 else if (hosts_fail+hosts_defer == hosts_total)
4326 s = "all host address lookups%s failed";
4327 else
4328 s = "some host address lookups failed and retry time "
4329 "not reached for other hosts or connection limit reached%s";
4330
4331 addr->message = string_sprintf(s,
4332 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4333 }
4334 }
4335 }
4336
4337 /* Update the database which keeps information about which messages are waiting
4338 for which hosts to become available. For some message-specific errors, the
4339 update_waiting flag is turned off because we don't want follow-on deliveries in
4340 those cases. If this transport instance is explicitly limited to one message
4341 per connection then follow-on deliveries are not possible and there's no need
4342 to create/update the per-transport wait-<transport_name> database. */
4343
4344 if (update_waiting && tblock->connection_max_messages != 1)
4345 transport_update_waiting(hostlist, tblock->name);
4346
4347 END_TRANSPORT:
4348
4349 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4350
4351 return TRUE; /* Each address has its status */
4352 }
4353
4354 /* vi: aw ai sw=2
4355 */
4356 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.