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Split out smtp MAIL and RCPT option string building
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15 #define DELIVER_BUFFER_SIZE 4096
16
17
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
28
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
60 #endif
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
85 #ifdef SUPPORT_TLS
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
88 #endif
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
93 #ifdef SUPPORT_TLS
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
129 #ifndef DISABLE_PRDR
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 #endif
133 #ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136 #endif
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
157 #ifdef SUPPORT_SOCKS
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 #endif
161 #ifdef SUPPORT_TLS
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
184 #endif
185 };
186
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
189
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
193 /* Default private options block for the smtp transport. */
194
195 smtp_transport_options_block smtp_transport_option_defaults = {
196 NULL, /* hosts */
197 NULL, /* fallback_hosts */
198 NULL, /* hostlist */
199 NULL, /* fallback_hostlist */
200 NULL, /* authenticated_sender */
201 US"$primary_hostname", /* helo_data */
202 NULL, /* interface */
203 NULL, /* port */
204 US"smtp", /* protocol */
205 NULL, /* DSCP */
206 NULL, /* serialize_hosts */
207 NULL, /* hosts_try_auth */
208 NULL, /* hosts_require_auth */
209 US"*", /* hosts_try_chunking */
210 #ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
212 NULL, /* hosts_require_dane */
213 #endif
214 NULL, /* hosts_try_fastopen */
215 #ifndef DISABLE_PRDR
216 US"*", /* hosts_try_prdr */
217 #endif
218 #ifndef DISABLE_OCSP
219 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
220 NULL, /* hosts_require_ocsp */
221 #endif
222 NULL, /* hosts_require_tls */
223 NULL, /* hosts_avoid_tls */
224 NULL, /* hosts_verify_avoid_tls */
225 NULL, /* hosts_avoid_pipelining */
226 NULL, /* hosts_avoid_esmtp */
227 NULL, /* hosts_nopass_tls */
228 5*60, /* command_timeout */
229 5*60, /* connect_timeout; shorter system default overrides */
230 5*60, /* data timeout */
231 10*60, /* final timeout */
232 1024, /* size_addition */
233 5, /* hosts_max_try */
234 50, /* hosts_max_try_hardlimit */
235 TRUE, /* address_retry_include_sender */
236 FALSE, /* allow_localhost */
237 FALSE, /* authenticated_sender_force */
238 FALSE, /* gethostbyname */
239 TRUE, /* dns_qualify_single */
240 FALSE, /* dns_search_parents */
241 { NULL, NULL }, /* dnssec_domains {request,require} */
242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
246 FALSE, /* lmtp_ignore_quota */
247 NULL, /* expand_retry_include_ip_address */
248 TRUE /* retry_include_ip_address */
249 #ifdef SUPPORT_SOCKS
250 ,NULL /* socks_proxy */
251 #endif
252 #ifdef SUPPORT_TLS
253 ,NULL, /* tls_certificate */
254 NULL, /* tls_crl */
255 NULL, /* tls_privatekey */
256 NULL, /* tls_require_ciphers */
257 NULL, /* tls_sni */
258 US"system", /* tls_verify_certificates */
259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
263 US"*", /* tls_try_verify_hosts */
264 US"*" /* tls_verify_cert_hostnames */
265 #endif
266 #ifndef DISABLE_DKIM
267 , {NULL, /* dkim_canon */
268 NULL, /* dkim_domain */
269 NULL, /* dkim_private_key */
270 NULL, /* dkim_selector */
271 NULL, /* dkim_sign_headers */
272 NULL, /* dkim_strict */
273 FALSE} /* dot_stuffed */
274 #endif
275 };
276
277 /* some DSN flags for use later */
278
279 static int rf_list[] = {rf_notify_never, rf_notify_success,
280 rf_notify_failure, rf_notify_delay };
281
282 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
283
284
285
286 /* Local statics */
287
288 static uschar *smtp_command; /* Points to last cmd for error messages */
289 static uschar *mail_command; /* Points to MAIL cmd for error messages */
290 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
291 static BOOL update_waiting; /* TRUE to update the "wait" database */
292 static BOOL pipelining_active; /* current transaction is in pipe mode */
293
294
295 /*************************************************
296 * Setup entry point *
297 *************************************************/
298
299 /* This function is called when the transport is about to be used,
300 but before running it in a sub-process. It is used for two things:
301
302 (1) To set the fallback host list in addresses, when delivering.
303 (2) To pass back the interface, port, protocol, and other options, for use
304 during callout verification.
305
306 Arguments:
307 tblock pointer to the transport instance block
308 addrlist list of addresses about to be transported
309 tf if not NULL, pointer to block in which to return options
310 uid the uid that will be set (not used)
311 gid the gid that will be set (not used)
312 errmsg place for error message (not used)
313
314 Returns: OK always (FAIL, DEFER not used)
315 */
316
317 static int
318 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
319 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
320 {
321 smtp_transport_options_block *ob =
322 (smtp_transport_options_block *)(tblock->options_block);
323
324 errmsg = errmsg; /* Keep picky compilers happy */
325 uid = uid;
326 gid = gid;
327
328 /* Pass back options if required. This interface is getting very messy. */
329
330 if (tf != NULL)
331 {
332 tf->interface = ob->interface;
333 tf->port = ob->port;
334 tf->protocol = ob->protocol;
335 tf->hosts = ob->hosts;
336 tf->hosts_override = ob->hosts_override;
337 tf->hosts_randomize = ob->hosts_randomize;
338 tf->gethostbyname = ob->gethostbyname;
339 tf->qualify_single = ob->dns_qualify_single;
340 tf->search_parents = ob->dns_search_parents;
341 tf->helo_data = ob->helo_data;
342 }
343
344 /* Set the fallback host list for all the addresses that don't have fallback
345 host lists, provided that the local host wasn't present in the original host
346 list. */
347
348 if (!testflag(addrlist, af_local_host_removed))
349 {
350 for (; addrlist != NULL; addrlist = addrlist->next)
351 if (addrlist->fallback_hosts == NULL)
352 addrlist->fallback_hosts = ob->fallback_hostlist;
353 }
354
355 return OK;
356 }
357
358
359
360 /*************************************************
361 * Initialization entry point *
362 *************************************************/
363
364 /* Called for each instance, after its options have been read, to
365 enable consistency checks to be done, or anything else that needs
366 to be set up.
367
368 Argument: pointer to the transport instance block
369 Returns: nothing
370 */
371
372 void
373 smtp_transport_init(transport_instance *tblock)
374 {
375 smtp_transport_options_block *ob =
376 (smtp_transport_options_block *)(tblock->options_block);
377
378 /* Retry_use_local_part defaults FALSE if unset */
379
380 if (tblock->retry_use_local_part == TRUE_UNSET)
381 tblock->retry_use_local_part = FALSE;
382
383 /* Set the default port according to the protocol */
384
385 if (ob->port == NULL)
386 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
387 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
388
389 /* Set up the setup entry point, to be called before subprocesses for this
390 transport. */
391
392 tblock->setup = smtp_transport_setup;
393
394 /* Complain if any of the timeouts are zero. */
395
396 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
397 ob->final_timeout <= 0)
398 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
399 "command, data, or final timeout value is zero for %s transport",
400 tblock->name);
401
402 /* If hosts_override is set and there are local hosts, set the global
403 flag that stops verify from showing router hosts. */
404
405 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
406
407 /* If there are any fallback hosts listed, build a chain of host items
408 for them, but do not do any lookups at this time. */
409
410 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
411 }
412
413
414
415
416
417 /*************************************************
418 * Set delivery info into all active addresses *
419 *************************************************/
420
421 /* Only addresses whose status is >= PENDING are relevant. A lesser
422 status means that an address is not currently being processed.
423
424 Arguments:
425 addrlist points to a chain of addresses
426 errno_value to put in each address's errno field
427 msg to put in each address's message field
428 rc to put in each address's transport_return field
429 pass_message if TRUE, set the "pass message" flag in the address
430 host if set, mark addrs as having used this host
431 smtp_greeting from peer
432 helo_response from peer
433
434 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
435 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
436 this particular type of timeout.
437
438 Returns: nothing
439 */
440
441 static void
442 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
443 BOOL pass_message, host_item * host
444 #ifdef EXPERIMENTAL_DSN_INFO
445 , const uschar * smtp_greeting, const uschar * helo_response
446 #endif
447 )
448 {
449 address_item *addr;
450 int orvalue = 0;
451 if (errno_value == ERRNO_CONNECTTIMEOUT)
452 {
453 errno_value = ETIMEDOUT;
454 orvalue = RTEF_CTOUT;
455 }
456 for (addr = addrlist; addr; addr = addr->next)
457 if (addr->transport_return >= PENDING)
458 {
459 addr->basic_errno = errno_value;
460 addr->more_errno |= orvalue;
461 if (msg != NULL)
462 {
463 addr->message = msg;
464 if (pass_message) setflag(addr, af_pass_message);
465 }
466 addr->transport_return = rc;
467 if (host)
468 {
469 addr->host_used = host;
470 #ifdef EXPERIMENTAL_DSN_INFO
471 if (smtp_greeting)
472 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
473 addr->smtp_greeting = smtp_greeting;
474
475 if (helo_response)
476 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
477 addr->helo_response = helo_response;
478 #endif
479 }
480 }
481 }
482
483 static void
484 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
485 BOOL pass_message)
486 {
487 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
488 #ifdef EXPERIMENTAL_DSN_INFO
489 , NULL, NULL
490 #endif
491 );
492 }
493
494
495 /*************************************************
496 * Check an SMTP response *
497 *************************************************/
498
499 /* This function is given an errno code and the SMTP response buffer
500 to analyse, together with the host identification for generating messages. It
501 sets an appropriate message and puts the first digit of the response code into
502 the yield variable. If no response was actually read, a suitable digit is
503 chosen.
504
505 Arguments:
506 host the current host, to get its name for messages
507 errno_value pointer to the errno value
508 more_errno from the top address for use with ERRNO_FILTER_FAIL
509 buffer the SMTP response buffer
510 yield where to put a one-digit SMTP response code
511 message where to put an error message
512 pass_message set TRUE if message is an SMTP response
513
514 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
515 */
516
517 static BOOL
518 check_response(host_item *host, int *errno_value, int more_errno,
519 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
520 {
521 uschar * pl = pipelining_active ? US"pipelined " : US"";
522
523 *yield = '4'; /* Default setting is to give a temporary error */
524
525 /* Handle response timeout */
526
527 if (*errno_value == ETIMEDOUT)
528 {
529 *message = US string_sprintf("SMTP timeout after %s%s",
530 pl, smtp_command);
531 if (transport_count > 0)
532 *message = US string_sprintf("%s (%d bytes written)", *message,
533 transport_count);
534 return FALSE;
535 }
536
537 /* Handle malformed SMTP response */
538
539 if (*errno_value == ERRNO_SMTPFORMAT)
540 {
541 const uschar *malfresp = string_printing(buffer);
542 while (isspace(*malfresp)) malfresp++;
543 *message = *malfresp == 0
544 ? string_sprintf("Malformed SMTP reply (an empty line) "
545 "in response to %s%s", pl, smtp_command)
546 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
547 pl, smtp_command, malfresp);
548 return FALSE;
549 }
550
551 /* Handle a failed filter process error; can't send QUIT as we mustn't
552 end the DATA. */
553
554 if (*errno_value == ERRNO_FILTER_FAIL)
555 {
556 *message = US string_sprintf("transport filter process failed (%d)%s",
557 more_errno,
558 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
559 return FALSE;
560 }
561
562 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
563 end the DATA. */
564
565 if (*errno_value == ERRNO_CHHEADER_FAIL)
566 {
567 *message =
568 US string_sprintf("failed to expand headers_add or headers_remove: %s",
569 expand_string_message);
570 return FALSE;
571 }
572
573 /* Handle failure to write a complete data block */
574
575 if (*errno_value == ERRNO_WRITEINCOMPLETE)
576 {
577 *message = US string_sprintf("failed to write a data block");
578 return FALSE;
579 }
580
581 #ifdef SUPPORT_I18N
582 /* Handle lack of advertised SMTPUTF8, for international message */
583 if (*errno_value == ERRNO_UTF8_FWD)
584 {
585 *message = US"utf8 support required but not offered for forwarding";
586 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
587 return TRUE;
588 }
589 #endif
590
591 /* Handle error responses from the remote mailer. */
592
593 if (buffer[0] != 0)
594 {
595 const uschar *s = string_printing(buffer);
596 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
597 "%s", pl, smtp_command, s);
598 *pass_message = TRUE;
599 *yield = buffer[0];
600 return TRUE;
601 }
602
603 /* No data was read. If there is no errno, this must be the EOF (i.e.
604 connection closed) case, which causes deferral. An explicit connection reset
605 error has the same effect. Otherwise, put the host's identity in the message,
606 leaving the errno value to be interpreted as well. In all cases, we have to
607 assume the connection is now dead. */
608
609 if (*errno_value == 0 || *errno_value == ECONNRESET)
610 {
611 *errno_value = ERRNO_SMTPCLOSED;
612 *message = US string_sprintf("Remote host closed connection "
613 "in response to %s%s", pl, smtp_command);
614 }
615 else *message = US string_sprintf("%s [%s]", host->name, host->address);
616
617 return FALSE;
618 }
619
620
621
622 /*************************************************
623 * Write error message to logs *
624 *************************************************/
625
626 /* This writes to the main log and to the message log.
627
628 Arguments:
629 addr the address item containing error information
630 host the current host
631
632 Returns: nothing
633 */
634
635 static void
636 write_logs(address_item *addr, host_item *host)
637 {
638 uschar * message = LOGGING(outgoing_port)
639 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
640 host->port == PORT_NONE ? 25 : host->port)
641 : string_sprintf("H=%s [%s]", host->name, host->address);
642
643 if (addr->message)
644 {
645 message = string_sprintf("%s: %s", message, addr->message);
646 if (addr->basic_errno > 0)
647 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
648 log_write(0, LOG_MAIN, "%s", message);
649 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
650 }
651 else
652 {
653 const uschar * s = exim_errstr(addr->basic_errno);
654 log_write(0, LOG_MAIN, "%s %s", message, s);
655 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
656 }
657 }
658
659 static void
660 msglog_line(host_item * host, uschar * message)
661 {
662 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
663 host->name, host->address, message);
664 }
665
666
667
668 #ifndef DISABLE_EVENT
669 /*************************************************
670 * Post-defer action *
671 *************************************************/
672
673 /* This expands an arbitrary per-transport string.
674 It might, for example, be used to write to the database log.
675
676 Arguments:
677 addr the address item containing error information
678 host the current host
679
680 Returns: nothing
681 */
682
683 static void
684 deferred_event_raise(address_item *addr, host_item *host)
685 {
686 uschar * action = addr->transport->event_action;
687 const uschar * save_domain;
688 uschar * save_local;
689
690 if (!action)
691 return;
692
693 save_domain = deliver_domain;
694 save_local = deliver_localpart;
695
696 /*XXX would ip & port already be set up? */
697 deliver_host_address = string_copy(host->address);
698 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
699 event_defer_errno = addr->basic_errno;
700
701 router_name = addr->router->name;
702 transport_name = addr->transport->name;
703 deliver_domain = addr->domain;
704 deliver_localpart = addr->local_part;
705
706 (void) event_raise(action, US"msg:host:defer",
707 addr->message
708 ? addr->basic_errno > 0
709 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
710 : string_copy(addr->message)
711 : addr->basic_errno > 0
712 ? string_copy(US strerror(addr->basic_errno))
713 : NULL);
714
715 deliver_localpart = save_local;
716 deliver_domain = save_domain;
717 router_name = transport_name = NULL;
718 }
719 #endif
720
721 /*************************************************
722 * Synchronize SMTP responses *
723 *************************************************/
724
725 /* This function is called from smtp_deliver() to receive SMTP responses from
726 the server, and match them up with the commands to which they relate. When
727 PIPELINING is not in use, this function is called after every command, and is
728 therefore somewhat over-engineered, but it is simpler to use a single scheme
729 that works both with and without PIPELINING instead of having two separate sets
730 of code.
731
732 The set of commands that are buffered up with pipelining may start with MAIL
733 and may end with DATA; in between are RCPT commands that correspond to the
734 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
735 etc.) are never buffered.
736
737 Errors after MAIL or DATA abort the whole process leaving the response in the
738 buffer. After MAIL, pending responses are flushed, and the original command is
739 re-instated in big_buffer for error messages. For RCPT commands, the remote is
740 permitted to reject some recipient addresses while accepting others. However
741 certain errors clearly abort the whole process. Set the value in
742 transport_return to PENDING_OK if the address is accepted. If there is a
743 subsequent general error, it will get reset accordingly. If not, it will get
744 converted to OK at the end.
745
746 Arguments:
747 addrlist the complete address list
748 include_affixes TRUE if affixes include in RCPT
749 sync_addr ptr to the ptr of the one to start scanning at (updated)
750 host the host we are connected to
751 count the number of responses to read
752 address_retry_
753 include_sender true if 4xx retry is to include the sender it its key
754 pending_MAIL true if the first response is for MAIL
755 pending_DATA 0 if last command sent was not DATA
756 +1 if previously had a good recipient
757 -1 if not previously had a good recipient
758 inblock incoming SMTP block
759 timeout timeout value
760 buffer buffer for reading response
761 buffsize size of buffer
762
763 Returns: 3 if at least one address had 2xx and one had 5xx
764 2 if at least one address had 5xx but none had 2xx
765 1 if at least one host had a 2xx response, but none had 5xx
766 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
767 -1 timeout while reading RCPT response
768 -2 I/O or other non-response error for RCPT
769 -3 DATA or MAIL failed - errno and buffer set
770 */
771
772 static int
773 sync_responses(address_item *addrlist, BOOL include_affixes,
774 address_item **sync_addr, host_item *host, int count,
775 BOOL address_retry_include_sender, BOOL pending_MAIL,
776 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
777 int buffsize)
778 {
779 address_item *addr = *sync_addr;
780 int yield = 0;
781
782 /* Handle the response for a MAIL command. On error, reinstate the original
783 command in big_buffer for error message use, and flush any further pending
784 responses before returning, except after I/O errors and timeouts. */
785
786 if (pending_MAIL)
787 {
788 count--;
789 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
790 {
791 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
792 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
793 if (errno == 0 && buffer[0] != 0)
794 {
795 uschar flushbuffer[4096];
796 int save_errno = 0;
797 if (buffer[0] == '4')
798 {
799 save_errno = ERRNO_MAIL4XX;
800 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
801 }
802 while (count-- > 0)
803 {
804 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
805 '2', timeout)
806 && (errno != 0 || flushbuffer[0] == 0))
807 break;
808 }
809 errno = save_errno;
810 }
811
812 if (pending_DATA) count--; /* Number of RCPT responses to come */
813 while (count-- > 0) /* Mark any pending addrs with the host used */
814 {
815 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
816 addr->host_used = host;
817 addr = addr->next;
818 }
819 return -3;
820 }
821 }
822
823 if (pending_DATA) count--; /* Number of RCPT responses to come */
824
825 /* Read and handle the required number of RCPT responses, matching each one up
826 with an address by scanning for the next address whose status is PENDING_DEFER.
827 */
828
829 while (count-- > 0)
830 {
831 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
832
833 /* The address was accepted */
834 addr->host_used = host;
835
836 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
837 {
838 yield |= 1;
839 addr->transport_return = PENDING_OK;
840
841 /* If af_dr_retry_exists is set, there was a routing delay on this address;
842 ensure that any address-specific retry record is expunged. We do this both
843 for the basic key and for the version that also includes the sender. */
844
845 if (testflag(addr, af_dr_retry_exists))
846 {
847 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
848 sender_address);
849 retry_add_item(addr, altkey, rf_delete);
850 retry_add_item(addr, addr->address_retry_key, rf_delete);
851 }
852 }
853
854 /* Timeout while reading the response */
855
856 else if (errno == ETIMEDOUT)
857 {
858 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
859 transport_rcpt_address(addr, include_affixes));
860 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
861 retry_add_item(addr, addr->address_retry_key, 0);
862 update_waiting = FALSE;
863 return -1;
864 }
865
866 /* Handle other errors in obtaining an SMTP response by returning -1. This
867 will cause all the addresses to be deferred. Restore the SMTP command in
868 big_buffer for which we are checking the response, so the error message
869 makes sense. */
870
871 else if (errno != 0 || buffer[0] == 0)
872 {
873 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
874 transport_rcpt_address(addr, include_affixes));
875 return -2;
876 }
877
878 /* Handle SMTP permanent and temporary response codes. */
879
880 else
881 {
882 addr->message =
883 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
884 "%s", transport_rcpt_address(addr, include_affixes),
885 string_printing(buffer));
886 setflag(addr, af_pass_message);
887 msglog_line(host, addr->message);
888
889 /* The response was 5xx */
890
891 if (buffer[0] == '5')
892 {
893 addr->transport_return = FAIL;
894 yield |= 2;
895 }
896
897 /* The response was 4xx */
898
899 else
900 {
901 addr->transport_return = DEFER;
902 addr->basic_errno = ERRNO_RCPT4XX;
903 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
904
905 #ifndef DISABLE_EVENT
906 event_defer_errno = addr->more_errno;
907 msg_event_raise(US"msg:rcpt:host:defer", addr);
908 #endif
909
910 /* Log temporary errors if there are more hosts to be tried.
911 If not, log this last one in the == line. */
912
913 if (host->next)
914 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
915
916 #ifndef DISABLE_EVENT
917 else
918 msg_event_raise(US"msg:rcpt:defer", addr);
919 #endif
920
921 /* Do not put this message on the list of those waiting for specific
922 hosts, as otherwise it is likely to be tried too often. */
923
924 update_waiting = FALSE;
925
926 /* Add a retry item for the address so that it doesn't get tried again
927 too soon. If address_retry_include_sender is true, add the sender address
928 to the retry key. */
929
930 if (address_retry_include_sender)
931 {
932 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
933 sender_address);
934 retry_add_item(addr, altkey, 0);
935 }
936 else retry_add_item(addr, addr->address_retry_key, 0);
937 }
938 }
939 } /* Loop for next RCPT response */
940
941 /* Update where to start at for the next block of responses, unless we
942 have already handled all the addresses. */
943
944 if (addr != NULL) *sync_addr = addr->next;
945
946 /* Handle a response to DATA. If we have not had any good recipients, either
947 previously or in this block, the response is ignored. */
948
949 if (pending_DATA != 0 &&
950 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
951 {
952 int code;
953 uschar *msg;
954 BOOL pass_message;
955 if (pending_DATA > 0 || (yield & 1) != 0)
956 {
957 if (errno == 0 && buffer[0] == '4')
958 {
959 errno = ERRNO_DATA4XX;
960 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
961 }
962 return -3;
963 }
964 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
965 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
966 "is in use and there were no good recipients\n", msg);
967 }
968
969 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
970 present) received 3xx. If any RCPTs were handled and yielded anything other
971 than 4xx, yield will be set non-zero. */
972
973 return yield;
974 }
975
976
977
978 /* Do the client side of smtp-level authentication */
979 /*
980 Arguments:
981 buffer EHLO response from server (gets overwritten)
982 addrlist chain of potential addresses to deliver
983 host host to deliver to
984 ob transport options
985 ibp, obp comms channel control blocks
986
987 Returns:
988 OK Success, or failed (but not required): global "smtp_authenticated" set
989 DEFER Failed authentication (and was required)
990 ERROR Internal problem
991
992 FAIL_SEND Failed communications - transmit
993 FAIL - response
994 */
995
996 int
997 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
998 smtp_transport_options_block *ob, BOOL is_esmtp,
999 smtp_inblock *ibp, smtp_outblock *obp)
1000 {
1001 int require_auth;
1002 uschar *fail_reason = US"server did not advertise AUTH support";
1003
1004 smtp_authenticated = FALSE;
1005 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1006 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1007
1008 if (is_esmtp && !regex_AUTH) regex_AUTH =
1009 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1010 FALSE, TRUE);
1011
1012 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1013 {
1014 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1015 expand_nmax = -1; /* reset */
1016
1017 /* Must not do this check until after we have saved the result of the
1018 regex match above. */
1019
1020 if (require_auth == OK ||
1021 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1022 {
1023 auth_instance *au;
1024 fail_reason = US"no common mechanisms were found";
1025
1026 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1027
1028 /* Scan the configured authenticators looking for one which is configured
1029 for use as a client, which is not suppressed by client_condition, and
1030 whose name matches an authentication mechanism supported by the server.
1031 If one is found, attempt to authenticate by calling its client function.
1032 */
1033
1034 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1035 {
1036 uschar *p = names;
1037 if (!au->client ||
1038 (au->client_condition != NULL &&
1039 !expand_check_condition(au->client_condition, au->name,
1040 US"client authenticator")))
1041 {
1042 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1043 au->name,
1044 (au->client)? "client_condition is false" :
1045 "not configured as a client");
1046 continue;
1047 }
1048
1049 /* Loop to scan supported server mechanisms */
1050
1051 while (*p != 0)
1052 {
1053 int rc;
1054 int len = Ustrlen(au->public_name);
1055 while (isspace(*p)) p++;
1056
1057 if (strncmpic(au->public_name, p, len) != 0 ||
1058 (p[len] != 0 && !isspace(p[len])))
1059 {
1060 while (*p != 0 && !isspace(*p)) p++;
1061 continue;
1062 }
1063
1064 /* Found data for a listed mechanism. Call its client entry. Set
1065 a flag in the outblock so that data is overwritten after sending so
1066 that reflections don't show it. */
1067
1068 fail_reason = US"authentication attempt(s) failed";
1069 obp->authenticating = TRUE;
1070 rc = (au->info->clientcode)(au, ibp, obp,
1071 ob->command_timeout, buffer, bufsize);
1072 obp->authenticating = FALSE;
1073 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1074 au->name, rc);
1075
1076 /* A temporary authentication failure must hold up delivery to
1077 this host. After a permanent authentication failure, we carry on
1078 to try other authentication methods. If all fail hard, try to
1079 deliver the message unauthenticated unless require_auth was set. */
1080
1081 switch(rc)
1082 {
1083 case OK:
1084 smtp_authenticated = TRUE; /* stops the outer loop */
1085 client_authenticator = au->name;
1086 if (au->set_client_id != NULL)
1087 client_authenticated_id = expand_string(au->set_client_id);
1088 break;
1089
1090 /* Failure after writing a command */
1091
1092 case FAIL_SEND:
1093 return FAIL_SEND;
1094
1095 /* Failure after reading a response */
1096
1097 case FAIL:
1098 if (errno != 0 || buffer[0] != '5') return FAIL;
1099 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1100 au->name, host->name, host->address, buffer);
1101 break;
1102
1103 /* Failure by some other means. In effect, the authenticator
1104 decided it wasn't prepared to handle this case. Typically this
1105 is the result of "fail" in an expansion string. Do we need to
1106 log anything here? Feb 2006: a message is now put in the buffer
1107 if logging is required. */
1108
1109 case CANCELLED:
1110 if (*buffer != 0)
1111 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1112 "authentication H=%s [%s] %s", au->name, host->name,
1113 host->address, buffer);
1114 break;
1115
1116 /* Internal problem, message in buffer. */
1117
1118 case ERROR:
1119 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1120 DEFER, FALSE);
1121 return ERROR;
1122 }
1123
1124 break; /* If not authenticated, try next authenticator */
1125 } /* Loop for scanning supported server mechanisms */
1126 } /* Loop for further authenticators */
1127 }
1128 }
1129
1130 /* If we haven't authenticated, but are required to, give up. */
1131
1132 if (require_auth == OK && !smtp_authenticated)
1133 {
1134 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1135 string_sprintf("authentication required but %s", fail_reason), DEFER,
1136 FALSE);
1137 return DEFER;
1138 }
1139
1140 return OK;
1141 }
1142
1143
1144 /* Construct AUTH appendix string for MAIL TO */
1145 /*
1146 Arguments
1147 buffer to build string
1148 addrlist chain of potential addresses to deliver
1149 ob transport options
1150
1151 Globals smtp_authenticated
1152 client_authenticated_sender
1153 Return True on error, otherwise buffer has (possibly empty) terminated string
1154 */
1155
1156 BOOL
1157 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1158 smtp_transport_options_block *ob)
1159 {
1160 uschar *local_authenticated_sender = authenticated_sender;
1161
1162 #ifdef notdef
1163 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1164 #endif
1165
1166 if (ob->authenticated_sender != NULL)
1167 {
1168 uschar *new = expand_string(ob->authenticated_sender);
1169 if (new == NULL)
1170 {
1171 if (!expand_string_forcedfail)
1172 {
1173 uschar *message = string_sprintf("failed to expand "
1174 "authenticated_sender: %s", expand_string_message);
1175 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1176 return TRUE;
1177 }
1178 }
1179 else if (new[0] != 0) local_authenticated_sender = new;
1180 }
1181
1182 /* Add the authenticated sender address if present */
1183
1184 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1185 local_authenticated_sender != NULL)
1186 {
1187 string_format(buffer, bufsize, " AUTH=%s",
1188 auth_xtextencode(local_authenticated_sender,
1189 Ustrlen(local_authenticated_sender)));
1190 client_authenticated_sender = string_copy(local_authenticated_sender);
1191 }
1192 else
1193 *buffer= 0;
1194
1195 return FALSE;
1196 }
1197
1198
1199
1200 #ifdef EXPERIMENTAL_DANE
1201 /* Lookup TLSA record for host/port.
1202 Return: OK success with dnssec; DANE mode
1203 DEFER Do not use this host now, may retry later
1204 FAIL_FORCED No TLSA record; DANE not usable
1205 FAIL Do not use this connection
1206 */
1207
1208 int
1209 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1210 {
1211 /* move this out to host.c given the similarity to dns_lookup() ? */
1212 uschar buffer[300];
1213 const uschar * fullname = buffer;
1214
1215 /* TLSA lookup string */
1216 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1217
1218 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1219 {
1220 case DNS_SUCCEED:
1221 if (!dns_is_secure(dnsa))
1222 {
1223 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1224 return DEFER;
1225 }
1226 return OK;
1227
1228 case DNS_AGAIN:
1229 return DEFER; /* just defer this TLS'd conn */
1230
1231 case DNS_NODATA: /* no TLSA RR for this lookup */
1232 case DNS_NOMATCH: /* no records at all for this lookup */
1233 return dane_required ? FAIL : FAIL_FORCED;
1234
1235 default:
1236 case DNS_FAIL:
1237 return dane_required ? FAIL : DEFER;
1238 }
1239 }
1240 #endif
1241
1242
1243
1244 typedef struct smtp_compare_s
1245 {
1246 uschar *current_sender_address;
1247 struct transport_instance *tblock;
1248 } smtp_compare_t;
1249
1250
1251 /* Create a unique string that identifies this message, it is based on
1252 sender_address, helo_data and tls_certificate if enabled.
1253 */
1254
1255 static uschar *
1256 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1257 {
1258 address_item * addr1;
1259 uschar * if1 = US"";
1260 uschar * helo1 = US"";
1261 #ifdef SUPPORT_TLS
1262 uschar * tlsc1 = US"";
1263 #endif
1264 uschar * save_sender_address = sender_address;
1265 uschar * local_identity = NULL;
1266 smtp_transport_options_block * ob =
1267 (smtp_transport_options_block *)tblock->options_block;
1268
1269 sender_address = sender;
1270
1271 addr1 = deliver_make_addr (sender, TRUE);
1272 deliver_set_expansions(addr1);
1273
1274 if (ob->interface)
1275 if1 = expand_string(ob->interface);
1276
1277 if (ob->helo_data)
1278 helo1 = expand_string(ob->helo_data);
1279
1280 #ifdef SUPPORT_TLS
1281 if (ob->tls_certificate)
1282 tlsc1 = expand_string(ob->tls_certificate);
1283 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1284 #else
1285 local_identity = string_sprintf ("%s^%s", if1, helo1);
1286 #endif
1287
1288 deliver_set_expansions(NULL);
1289 sender_address = save_sender_address;
1290
1291 return local_identity;
1292 }
1293
1294
1295
1296 /* This routine is a callback that is called from transport_check_waiting.
1297 This function will evaluate the incoming message versus the previous
1298 message. If the incoming message is using a different local identity then
1299 we will veto this new message. */
1300
1301 static BOOL
1302 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1303 {
1304 uschar * message_local_identity,
1305 * current_local_identity,
1306 * new_sender_address;
1307
1308 current_local_identity =
1309 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1310
1311 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1312 return 0;
1313
1314 message_local_identity =
1315 smtp_local_identity(new_sender_address, s_compare->tblock);
1316
1317 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1318 }
1319
1320
1321
1322 uschar
1323 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1324 {
1325 #ifdef SUPPORT_TLS
1326 if ( checks & PEER_OFFERED_TLS
1327 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1328 checks &= ~PEER_OFFERED_TLS;
1329 #endif
1330
1331 if ( checks & PEER_OFFERED_IGNQ
1332 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_IGNQ;
1335
1336 if ( checks & PEER_OFFERED_CHUNKING
1337 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_CHUNKING;
1339
1340 #ifndef DISABLE_PRDR
1341 if ( checks & PEER_OFFERED_PRDR
1342 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1343 checks &= ~PEER_OFFERED_PRDR;
1344 #endif
1345
1346 #ifdef SUPPORT_I18N
1347 if ( checks & PEER_OFFERED_UTF8
1348 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_UTF8;
1350 #endif
1351
1352 if ( checks & PEER_OFFERED_DSN
1353 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_DSN;
1355
1356 if ( checks & PEER_OFFERED_PIPE
1357 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1358 PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~PEER_OFFERED_PIPE;
1360
1361 if ( checks & PEER_OFFERED_SIZE
1362 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1363 checks &= ~PEER_OFFERED_SIZE;
1364
1365 return checks;
1366 }
1367
1368
1369
1370 /* Callback for emitting a BDAT data chunk header.
1371
1372 If given a nonzero size, first flush any buffered SMTP commands
1373 then emit the command.
1374
1375 Reap previous SMTP command responses if requested.
1376 Reap one SMTP command response if requested.
1377
1378 Returns: OK or ERROR
1379 */
1380
1381 static int
1382 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1383 unsigned chunk_size, unsigned flags)
1384 {
1385 smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 int cmd_count = 0;
1388 int prev_cmd_count;
1389 uschar * buffer = tctx->buffer;
1390
1391
1392 /* Write SMTP chunk header command */
1393
1394 if (chunk_size > 0)
1395 {
1396 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1397 chunk_size,
1398 flags & tc_chunk_last ? " LAST" : "")
1399 ) < 0) return ERROR;
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1402 }
1403
1404 prev_cmd_count = cmd_count += tctx->cmd_count;
1405
1406 /* Reap responses for any previous, but not one we just emitted */
1407
1408 if (chunk_size > 0)
1409 prev_cmd_count--;
1410 if (tctx->pending_BDAT)
1411 prev_cmd_count--;
1412
1413 if (flags & tc_reap_prev && prev_cmd_count > 0)
1414 {
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
1417
1418 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1419 tctx->sync_addr, tctx->host, prev_cmd_count,
1420 ob->address_retry_include_sender,
1421 tctx->pending_MAIL, 0,
1422 tctx->inblock,
1423 ob->command_timeout,
1424 buffer, DELIVER_BUFFER_SIZE))
1425 {
1426 case 1: /* 2xx (only) => OK */
1427 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1428 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1429 case 0: break; /* No 2xx or 5xx, but no probs */
1430
1431 case -1: /* Timeout on RCPT */
1432 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1433 }
1434 cmd_count = 1;
1435 if (!tctx->pending_BDAT)
1436 pipelining_active = FALSE;
1437 }
1438
1439 /* Reap response for an outstanding BDAT */
1440
1441 if (tctx->pending_BDAT)
1442 {
1443 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1444
1445 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1446 ob->command_timeout))
1447 {
1448 if (errno == 0 && buffer[0] == '4')
1449 {
1450 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1451 tctx->first_addr->more_errno |=
1452 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1453 }
1454 return ERROR;
1455 }
1456 cmd_count--;
1457 tctx->pending_BDAT = FALSE;
1458 pipelining_active = FALSE;
1459 }
1460 else if (chunk_size > 0)
1461 tctx->pending_BDAT = TRUE;
1462
1463
1464 tctx->cmd_count = cmd_count;
1465 return OK;
1466 }
1467
1468
1469
1470 /*************************************************
1471 * Make connection for given message *
1472 *************************************************/
1473
1474 typedef struct {
1475 address_item * addrlist;
1476 host_item * host;
1477 int host_af;
1478 int port;
1479 uschar * interface;
1480
1481 BOOL lmtp:1;
1482 BOOL smtps:1;
1483 BOOL ok:1;
1484 BOOL send_rset:1;
1485 BOOL send_quit:1;
1486 BOOL setting_up:1;
1487 BOOL esmtp:1;
1488 BOOL esmtp_sent:1;
1489 BOOL pending_MAIL:1;
1490 #ifndef DISABLE_PRDR
1491 BOOL prdr_active:1;
1492 #endif
1493 #ifdef SUPPORT_I18N
1494 BOOL utf8_needed:1;
1495 #endif
1496 BOOL dsn_all_lasthop:1;
1497 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1498 BOOL dane:1;
1499 BOOL dane_required:1;
1500 #endif
1501
1502 int max_rcpt;
1503
1504 uschar peer_offered;
1505 uschar * igquotstr;
1506 uschar * helo_data;
1507 #ifdef EXPERIMENTAL_DSN_INFO
1508 uschar * smtp_greeting;
1509 uschar * helo_response;
1510 #endif
1511
1512 smtp_inblock inblock;
1513 smtp_outblock outblock;
1514 uschar buffer[DELIVER_BUFFER_SIZE];
1515 uschar inbuffer[4096];
1516 uschar outbuffer[4096];
1517
1518 transport_instance * tblock;
1519 smtp_transport_options_block * ob;
1520 } smtp_context;
1521
1522 /*
1523 Arguments:
1524 ctx connection context
1525 message_defer return set TRUE if yield is OK, but all addresses were deferred
1526 because of a non-recipient, non-host failure, that is, a
1527 4xx response to MAIL FROM, DATA, or ".". This is a defer
1528 that is specific to the message.
1529 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1530 a second attempt after TLS initialization fails
1531 verify TRUE if connection is for a verify callout, FALSE for
1532 a delivery attempt
1533
1534 Returns: OK - the connection was made and the delivery attempted;
1535 fd is set in the conn context, tls_out set up.
1536 DEFER - the connection could not be made, or something failed
1537 while setting up the SMTP session, or there was a
1538 non-message-specific error, such as a timeout.
1539 ERROR - helo_data or add_headers or authenticated_sender is
1540 specified for this transport, and the string failed
1541 to expand
1542 */
1543 int
1544 smtp_setup_conn(smtp_context * sx, BOOL * message_defer, BOOL suppress_tls,
1545 BOOL verify)
1546 {
1547 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1548 dns_answer tlsa_dnsa;
1549 #endif
1550 BOOL pass_message = FALSE;
1551
1552 uschar * message = NULL;
1553 int save_errno;
1554 int yield = OK;
1555 int rc;
1556
1557 sx->ob = (smtp_transport_options_block *)(sx->tblock->options_block);
1558
1559 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1560 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1561 sx->ok = FALSE;
1562 sx->send_rset = TRUE;
1563 sx->send_quit = TRUE;
1564 sx->setting_up = TRUE;
1565 sx->esmtp = TRUE;
1566 sx->esmtp_sent = FALSE;
1567 #ifdef SUPPORT_I18N
1568 sx->utf8_needed = FALSE;
1569 #endif
1570 sx->dsn_all_lasthop = TRUE;
1571 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1572 sx->dane = FALSE;
1573 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1574 #endif
1575
1576 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1577 sx->helo_data = NULL;
1578 sx->peer_offered = 0;
1579 sx->igquotstr = US"";
1580 #ifdef EXPERIMENTAL_DSN_INFO
1581 sx->smtp_greeting = NULL;
1582 sx->helo_response = NULL;
1583 #endif
1584
1585 *message_defer = FALSE;
1586 smtp_command = US"initial connection";
1587 sx->buffer[0] = '\0';
1588
1589 /* Set up the buffer for reading SMTP response packets. */
1590
1591 sx->inblock.buffer = sx->inbuffer;
1592 sx->inblock.buffersize = sizeof(sx->inbuffer);
1593 sx->inblock.ptr = sx->inbuffer;
1594 sx->inblock.ptrend = sx->inbuffer;
1595
1596 /* Set up the buffer for holding SMTP commands while pipelining */
1597
1598 sx->outblock.buffer = sx->outbuffer;
1599 sx->outblock.buffersize = sizeof(sx->outbuffer);
1600 sx->outblock.ptr = sx->outbuffer;
1601 sx->outblock.cmd_count = 0;
1602 sx->outblock.authenticating = FALSE;
1603
1604 /* Reset the parameters of a TLS session. */
1605
1606 tls_out.bits = 0;
1607 tls_out.cipher = NULL; /* the one we may use for this transport */
1608 tls_out.ourcert = NULL;
1609 tls_out.peercert = NULL;
1610 tls_out.peerdn = NULL;
1611 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1612 tls_out.sni = NULL;
1613 #endif
1614 tls_out.ocsp = OCSP_NOT_REQ;
1615
1616 /* Flip the legacy TLS-related variables over to the outbound set in case
1617 they're used in the context of the transport. Don't bother resetting
1618 afterward as we're in a subprocess. */
1619
1620 tls_modify_variables(&tls_out);
1621
1622 #ifndef SUPPORT_TLS
1623 if (sx->smtps)
1624 {
1625 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1626 DEFER, FALSE);
1627 return ERROR;
1628 }
1629 #endif
1630
1631 /* Make a connection to the host if this isn't a continued delivery, and handle
1632 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1633 specially so they can be identified for retries. */
1634
1635 if (continue_hostname == NULL)
1636 {
1637 /* This puts port into host->port */
1638 sx->inblock.sock = sx->outblock.sock =
1639 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1640 sx->ob->connect_timeout, sx->tblock);
1641
1642 if (sx->inblock.sock < 0)
1643 {
1644 set_errno_nohost(sx->addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1645 NULL, DEFER, FALSE);
1646 return DEFER;
1647 }
1648
1649 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1650 {
1651 tls_out.dane_verified = FALSE;
1652 tls_out.tlsa_usage = 0;
1653
1654 if (sx->host->dnssec == DS_YES)
1655 {
1656 if( sx->dane_required
1657 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1658 )
1659 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1660 {
1661 case OK: sx->dane = TRUE; break;
1662 case FAIL_FORCED: break;
1663 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1664 string_sprintf("DANE error: tlsa lookup %s",
1665 rc == DEFER ? "DEFER" : "FAIL"),
1666 rc, FALSE);
1667 return rc;
1668 }
1669 }
1670 else if (sx->dane_required)
1671 {
1672 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1673 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1674 FAIL, FALSE);
1675 return FAIL;
1676 }
1677
1678 if (sx->dane)
1679 sx->ob->tls_tempfail_tryclear = FALSE;
1680 }
1681 #endif /*DANE*/
1682
1683 /* Expand the greeting message while waiting for the initial response. (Makes
1684 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1685 delayed till here so that $sending_interface and $sending_port are set. */
1686
1687 sx->helo_data = expand_string(sx->ob->helo_data);
1688 #ifdef SUPPORT_I18N
1689 if (sx->helo_data)
1690 {
1691 uschar * errstr = NULL;
1692 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data, &errstr)), errstr)
1693 {
1694 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1695 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1696 yield = DEFER;
1697 goto SEND_QUIT;
1698 }
1699 }
1700 #endif
1701
1702 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1703 is nevertheless a reasonably clean way of programming this kind of logic,
1704 where you want to escape on any error. */
1705
1706 if (!sx->smtps)
1707 {
1708 BOOL good_response;
1709
1710 #ifdef TCP_QUICKACK
1711 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1712 #endif
1713 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1714 '2', sx->ob->command_timeout);
1715 #ifdef EXPERIMENTAL_DSN_INFO
1716 sx->smtp_greeting = string_copy(sx->buffer);
1717 #endif
1718 if (!good_response) goto RESPONSE_FAILED;
1719
1720 #ifndef DISABLE_EVENT
1721 {
1722 uschar * s;
1723 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1724 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1725 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1726 if (s)
1727 {
1728 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1729 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1730 DEFER, FALSE);
1731 yield = DEFER;
1732 goto SEND_QUIT;
1733 }
1734 }
1735 #endif
1736
1737 /* Now check if the helo_data expansion went well, and sign off cleanly if
1738 it didn't. */
1739
1740 if (!sx->helo_data)
1741 {
1742 message = string_sprintf("failed to expand helo_data: %s",
1743 expand_string_message);
1744 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1745 yield = DEFER;
1746 goto SEND_QUIT;
1747 }
1748 }
1749
1750 /** Debugging without sending a message
1751 sx->addrlist->transport_return = DEFER;
1752 goto SEND_QUIT;
1753 **/
1754
1755 /* Errors that occur after this point follow an SMTP command, which is
1756 left in big_buffer by smtp_write_command() for use in error messages. */
1757
1758 smtp_command = big_buffer;
1759
1760 /* Tell the remote who we are...
1761
1762 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1763 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1764 greeting is of this form. The assumption was that the far end supports it
1765 properly... but experience shows that there are some that give 5xx responses,
1766 even though the banner includes "ESMTP" (there's a bloody-minded one that
1767 says "ESMTP not spoken here"). Cope with that case.
1768
1769 September 2000: Time has passed, and it seems reasonable now to always send
1770 EHLO at the start. It is also convenient to make the change while installing
1771 the TLS stuff.
1772
1773 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1774 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1775 would be no way to send out the mails, so there is now a host list
1776 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1777 PIPELINING problem as well. Maybe it can also be useful to cure other
1778 problems with broken servers.
1779
1780 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1781 Then somebody tried it with a Microsoft mailer... It seems that all other
1782 mailers use upper case for some reason (the RFC is quite clear about case
1783 independence) so, for peace of mind, I gave in. */
1784
1785 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1786
1787 /* Alas; be careful, since this goto is not an error-out, so conceivably
1788 we might set data between here and the target which we assume to exist
1789 and be usable. I can see this coming back to bite us. */
1790 #ifdef SUPPORT_TLS
1791 if (sx->smtps)
1792 {
1793 smtp_peer_options |= PEER_OFFERED_TLS;
1794 suppress_tls = FALSE;
1795 sx->ob->tls_tempfail_tryclear = FALSE;
1796 smtp_command = US"SSL-on-connect";
1797 goto TLS_NEGOTIATE;
1798 }
1799 #endif
1800
1801 if (sx->esmtp)
1802 {
1803 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1804 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1805 goto SEND_FAILED;
1806 sx->esmtp_sent = TRUE;
1807 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1808 sx->ob->command_timeout))
1809 {
1810 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1811 {
1812 #ifdef EXPERIMENTAL_DSN_INFO
1813 sx->helo_response = string_copy(sx->buffer);
1814 #endif
1815 goto RESPONSE_FAILED;
1816 }
1817 sx->esmtp = FALSE;
1818 }
1819 #ifdef EXPERIMENTAL_DSN_INFO
1820 sx->helo_response = string_copy(sx->buffer);
1821 #endif
1822 }
1823 else
1824 DEBUG(D_transport)
1825 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1826
1827 if (!sx->esmtp)
1828 {
1829 BOOL good_response;
1830 int n = sizeof(sx->buffer);
1831 uschar * rsp = sx->buffer;
1832
1833 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1834 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1835
1836 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1837 goto SEND_FAILED;
1838 good_response = smtp_read_response(&sx->inblock, rsp, n,
1839 '2', sx->ob->command_timeout);
1840 #ifdef EXPERIMENTAL_DSN_INFO
1841 sx->helo_response = string_copy(rsp);
1842 #endif
1843 if (!good_response)
1844 {
1845 /* Handle special logging for a closed connection after HELO
1846 when had previously sent EHLO */
1847
1848 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1849 {
1850 sx->send_quit = FALSE;
1851 save_errno = ERRNO_SMTPCLOSED;
1852 message = string_sprintf("Remote host closed connection "
1853 "in response to %s (EHLO response was: %s)",
1854 smtp_command, sx->buffer);
1855 goto FAILED;
1856 }
1857 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1858 goto RESPONSE_FAILED;
1859 }
1860 }
1861
1862 sx->peer_offered = smtp_peer_options = 0;
1863
1864 if (sx->esmtp || sx->lmtp)
1865 {
1866 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
1867 PEER_OFFERED_TLS /* others checked later */
1868 );
1869
1870 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1871
1872 #ifdef SUPPORT_TLS
1873 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1874 #endif
1875 }
1876 }
1877
1878 /* For continuing deliveries down the same channel, the socket is the standard
1879 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1880 below). Set up the pointer to where subsequent commands will be left, for
1881 error messages. Note that smtp_peer_options will have been
1882 set from the command line if they were set in the process that passed the
1883 connection on. */
1884
1885 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1886 as the continue goes via transport_pass_socket() and doublefork and exec.
1887 It does not wait. Unclear how we keep separate host's responses
1888 separate - we could match up by host ip+port as a bodge. */
1889
1890 else
1891 {
1892 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1893 smtp_command = big_buffer;
1894 sx->host->port = sx->port; /* Record the port that was used */
1895 }
1896
1897 /* If TLS is available on this connection, whether continued or not, attempt to
1898 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1899 send another EHLO - the server may give a different answer in secure mode. We
1900 use a separate buffer for reading the response to STARTTLS so that if it is
1901 negative, the original EHLO data is available for subsequent analysis, should
1902 the client not be required to use TLS. If the response is bad, copy the buffer
1903 for error analysis. */
1904
1905 #ifdef SUPPORT_TLS
1906 if ( smtp_peer_options & PEER_OFFERED_TLS
1907 && !suppress_tls
1908 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK)
1909 {
1910 uschar buffer2[4096];
1911 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1912 goto SEND_FAILED;
1913
1914 /* If there is an I/O error, transmission of this message is deferred. If
1915 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1916 false, we also defer. However, if there is a temporary rejection of STARTTLS
1917 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1918 STARTTLS, we carry on. This means we will try to send the message in clear,
1919 unless the host is in hosts_require_tls (tested below). */
1920
1921 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1922 sx->ob->command_timeout))
1923 {
1924 if ( errno != 0
1925 || buffer2[0] == 0
1926 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1927 )
1928 {
1929 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1930 goto RESPONSE_FAILED;
1931 }
1932 }
1933
1934 /* STARTTLS accepted: try to negotiate a TLS session. */
1935
1936 else
1937 TLS_NEGOTIATE:
1938 {
1939 address_item * addr;
1940 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1941 # ifdef EXPERIMENTAL_DANE
1942 , sx->dane ? &tlsa_dnsa : NULL
1943 # endif
1944 );
1945
1946 /* TLS negotiation failed; give an error. From outside, this function may
1947 be called again to try in clear on a new connection, if the options permit
1948 it for this host. */
1949
1950 if (rc != OK)
1951 {
1952 # ifdef EXPERIMENTAL_DANE
1953 if (sx->dane) log_write(0, LOG_MAIN,
1954 "DANE attempt failed; no TLS connection to %s [%s]",
1955 sx->host->name, sx->host->address);
1956 # endif
1957
1958 save_errno = ERRNO_TLSFAILURE;
1959 message = US"failure while setting up TLS session";
1960 sx->send_quit = FALSE;
1961 goto TLS_FAILED;
1962 }
1963
1964 /* TLS session is set up */
1965
1966 smtp_peer_options_wrap = smtp_peer_options;
1967 for (addr = sx->addrlist; addr; addr = addr->next)
1968 if (addr->transport_return == PENDING_DEFER)
1969 {
1970 addr->cipher = tls_out.cipher;
1971 addr->ourcert = tls_out.ourcert;
1972 addr->peercert = tls_out.peercert;
1973 addr->peerdn = tls_out.peerdn;
1974 addr->ocsp = tls_out.ocsp;
1975 }
1976 }
1977 }
1978
1979 /* if smtps, we'll have smtp_command set to something else; always safe to
1980 reset it here. */
1981 smtp_command = big_buffer;
1982
1983 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1984 helo_data is null, we are dealing with a connection that was passed from
1985 another process, and so we won't have expanded helo_data above. We have to
1986 expand it here. $sending_ip_address and $sending_port are set up right at the
1987 start of the Exim process (in exim.c). */
1988
1989 if (tls_out.active >= 0)
1990 {
1991 char *greeting_cmd;
1992 BOOL good_response;
1993
1994 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1995 {
1996 uschar *message = string_sprintf("failed to expand helo_data: %s",
1997 expand_string_message);
1998 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1999 yield = DEFER;
2000 goto SEND_QUIT;
2001 }
2002
2003 /* For SMTPS we need to wait for the initial OK response. */
2004 if (sx->smtps)
2005 {
2006 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2007 '2', sx->ob->command_timeout);
2008 #ifdef EXPERIMENTAL_DSN_INFO
2009 sx->smtp_greeting = string_copy(sx->buffer);
2010 #endif
2011 if (!good_response) goto RESPONSE_FAILED;
2012 }
2013
2014 if (sx->esmtp)
2015 greeting_cmd = "EHLO";
2016 else
2017 {
2018 greeting_cmd = "HELO";
2019 DEBUG(D_transport)
2020 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2021 }
2022
2023 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
2024 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2025 goto SEND_FAILED;
2026 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2027 '2', sx->ob->command_timeout);
2028 #ifdef EXPERIMENTAL_DSN_INFO
2029 sx->helo_response = string_copy(sx->buffer);
2030 #endif
2031 if (!good_response) goto RESPONSE_FAILED;
2032 smtp_peer_options = 0;
2033 }
2034
2035 /* If the host is required to use a secure channel, ensure that we
2036 have one. */
2037
2038 else if ( sx->smtps
2039 # ifdef EXPERIMENTAL_DANE
2040 || sx->dane
2041 # endif
2042 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2043 )
2044 {
2045 save_errno = ERRNO_TLSREQUIRED;
2046 message = string_sprintf("a TLS session is required, but %s",
2047 smtp_peer_options & PEER_OFFERED_TLS
2048 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2049 goto TLS_FAILED;
2050 }
2051 #endif /*SUPPORT_TLS*/
2052
2053 /* If TLS is active, we have just started it up and re-done the EHLO command,
2054 so its response needs to be analyzed. If TLS is not active and this is a
2055 continued session down a previously-used socket, we haven't just done EHLO, so
2056 we skip this. */
2057
2058 if (continue_hostname == NULL
2059 #ifdef SUPPORT_TLS
2060 || tls_out.active >= 0
2061 #endif
2062 )
2063 {
2064 if (sx->esmtp || sx->lmtp)
2065 {
2066 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2067 0 /* no TLS */
2068 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2069 | PEER_OFFERED_CHUNKING
2070 | PEER_OFFERED_PRDR
2071 #ifdef SUPPORT_I18N
2072 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2073 /*XXX if we hand peercaps on to continued-conn processes,
2074 must not depend on this addr */
2075 #endif
2076 | PEER_OFFERED_DSN
2077 | PEER_OFFERED_PIPE
2078 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2079 );
2080
2081 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2082 lmtp_ignore_quota option was set. */
2083
2084 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2085
2086 /* If the response to EHLO specified support for the SIZE parameter, note
2087 this, provided size_addition is non-negative. */
2088
2089 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2090
2091 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2092 the current host, esmtp will be false, so PIPELINING can never be used. If
2093 the current host matches hosts_avoid_pipelining, don't do it. */
2094
2095 if ( sx->peer_offered & PEER_OFFERED_PIPE
2096 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2097 smtp_peer_options |= PEER_OFFERED_PIPE;
2098
2099 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2100 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2101
2102 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2103 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2104 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2105
2106 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2107 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2108
2109 #ifndef DISABLE_PRDR
2110 if ( sx->peer_offered & PEER_OFFERED_PRDR
2111 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2112 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2113
2114 if (sx->peer_offered & PEER_OFFERED_PRDR)
2115 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2116 #endif
2117
2118 /* Note if the server supports DSN */
2119 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2120 DEBUG(D_transport) debug_printf("%susing DSN\n",
2121 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2122
2123 /* Note if the response to EHLO specifies support for the AUTH extension.
2124 If it has, check that this host is one we want to authenticate to, and do
2125 the business. The host name and address must be available when the
2126 authenticator's client driver is running. */
2127
2128 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2129 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2130 {
2131 default: goto SEND_QUIT;
2132 case OK: break;
2133 case FAIL_SEND: goto SEND_FAILED;
2134 case FAIL: goto RESPONSE_FAILED;
2135 }
2136 }
2137 }
2138 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2139
2140 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2141 message-specific. */
2142
2143 sx->setting_up = FALSE;
2144
2145 #ifdef SUPPORT_I18N
2146 if (sx->addrlist->prop.utf8_msg)
2147 {
2148 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2149 && !sx->addrlist->prop.utf8_downcvt_maybe;
2150 DEBUG(D_transport) if (!sx->utf8_needed)
2151 debug_printf("utf8: %s downconvert\n",
2152 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2153 }
2154
2155 /* If this is an international message we need the host to speak SMTPUTF8 */
2156 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2157 {
2158 errno = ERRNO_UTF8_FWD;
2159 goto RESPONSE_FAILED;
2160 }
2161 #endif
2162
2163 return OK;
2164
2165
2166 {
2167 int code;
2168 uschar * set_message;
2169
2170 RESPONSE_FAILED:
2171 {
2172 save_errno = errno;
2173 message = NULL;
2174 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2175 sx->buffer, &code, &message, &pass_message);
2176 goto FAILED;
2177 }
2178
2179 SEND_FAILED:
2180 {
2181 save_errno = errno;
2182 code = '4';
2183 message = US string_sprintf("send() to %s [%s] failed: %s",
2184 sx->host->name, sx->host->address, strerror(save_errno));
2185 sx->send_quit = FALSE;
2186 goto FAILED;
2187 }
2188
2189 /* This label is jumped to directly when a TLS negotiation has failed,
2190 or was not done for a host for which it is required. Values will be set
2191 in message and save_errno, and setting_up will always be true. Treat as
2192 a temporary error. */
2193
2194 #ifdef SUPPORT_TLS
2195 TLS_FAILED:
2196 code = '4';
2197 #endif
2198
2199 /* The failure happened while setting up the call; see if the failure was
2200 a 5xx response (this will either be on connection, or following HELO - a 5xx
2201 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2202 never going to accept them. For other errors during setting up (timeouts or
2203 whatever), defer all addresses, and yield DEFER, so that the host is not
2204 tried again for a while. */
2205
2206 FAILED:
2207 sx->ok = FALSE; /* For when reached by GOTO */
2208 set_message = message;
2209
2210 yield = code == '5'
2211 #ifdef SUPPORT_I18N
2212 || errno == ERRNO_UTF8_FWD
2213 #endif
2214 ? FAIL : DEFER;
2215
2216 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2217 #ifdef EXPERIMENTAL_DSN_INFO
2218 , sx->smtp_greeting, sx->helo_response
2219 #endif
2220 );
2221 }
2222
2223
2224 SEND_QUIT:
2225
2226 if (sx->send_quit)
2227 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2228
2229 /*END_OFF:*/
2230
2231 #ifdef SUPPORT_TLS
2232 tls_close(FALSE, TRUE);
2233 #endif
2234
2235 /* Close the socket, and return the appropriate value, first setting
2236 works because the NULL setting is passed back to the calling process, and
2237 remote_max_parallel is forced to 1 when delivering over an existing connection,
2238
2239 If all went well and continue_more is set, we shouldn't actually get here if
2240 there are further addresses, as the return above will be taken. However,
2241 writing RSET might have failed, or there may be other addresses whose hosts are
2242 specified in the transports, and therefore not visible at top level, in which
2243 case continue_more won't get set. */
2244
2245 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2246 if (sx->send_quit)
2247 {
2248 shutdown(sx->outblock.sock, SHUT_WR);
2249 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2250 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2251 rc--; /* drain socket */
2252 }
2253 (void)close(sx->inblock.sock);
2254
2255 #ifndef DISABLE_EVENT
2256 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2257 #endif
2258
2259 continue_transport = NULL;
2260 continue_hostname = NULL;
2261 return yield;
2262 }
2263
2264
2265
2266
2267 /* Create the string of options that will be appended to the MAIL FROM:
2268 in the connection context buffer */
2269
2270 static int
2271 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2272 {
2273 uschar * p = sx->buffer;
2274 address_item * addr;
2275 int address_count;
2276
2277 *p = 0;
2278
2279 /* If we know the receiving MTA supports the SIZE qualification,
2280 send it, adding something to the message size to allow for imprecision
2281 and things that get added en route. Exim keeps the number of lines
2282 in a message, so we can give an accurate value for the original message, but we
2283 need some additional to handle added headers. (Double "." characters don't get
2284 included in the count.) */
2285
2286 if (sx->peer_offered & PEER_OFFERED_SIZE)
2287 {
2288 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2289 while (*p) p++;
2290 }
2291
2292 #ifndef DISABLE_PRDR
2293 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2294 request that */
2295
2296 sx->prdr_active = FALSE;
2297 if (sx->peer_offered & PEER_OFFERED_PRDR)
2298 for (addr = addrlist; addr; addr = addr->next)
2299 if (addr->transport_return == PENDING_DEFER)
2300 {
2301 for (addr = addr->next; addr; addr = addr->next)
2302 if (addr->transport_return == PENDING_DEFER)
2303 { /* at least two recipients to send */
2304 sx->prdr_active = TRUE;
2305 sprintf(CS p, " PRDR"); p += 5;
2306 break;
2307 }
2308 break;
2309 }
2310 #endif
2311
2312 #ifdef SUPPORT_I18N
2313 /* If it supports internationalised messages, and this meesage need that,
2314 request it */
2315
2316 if ( sx->peer_offered & PEER_OFFERED_UTF8
2317 && addrlist->prop.utf8_msg
2318 && !addrlist->prop.utf8_downcvt
2319 )
2320 Ustrcpy(p, " SMTPUTF8"), p += 9;
2321 #endif
2322
2323 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2324 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2325 addr && address_count < sx->max_rcpt;
2326 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2327 {
2328 address_count++;
2329 if (!(addr->dsn_flags & rf_dsnlasthop))
2330 {
2331 sx->dsn_all_lasthop = FALSE;
2332 break;
2333 }
2334 }
2335
2336 /* Add any DSN flags to the mail command */
2337
2338 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2339 {
2340 if (dsn_ret == dsn_ret_hdrs)
2341 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2342 else if (dsn_ret == dsn_ret_full)
2343 { Ustrcpy(p, " RET=FULL"); p += 9; }
2344
2345 if (dsn_envid)
2346 {
2347 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2348 while (*p) p++;
2349 }
2350 }
2351
2352 /* If an authenticated_sender override has been specified for this transport
2353 instance, expand it. If the expansion is forced to fail, and there was already
2354 an authenticated_sender for this message, the original value will be used.
2355 Other expansion failures are serious. An empty result is ignored, but there is
2356 otherwise no check - this feature is expected to be used with LMTP and other
2357 cases where non-standard addresses (e.g. without domains) might be required. */
2358
2359 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2360 return ERROR;
2361
2362 return OK;
2363 }
2364
2365
2366 static void
2367 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2368 {
2369 uschar * p = sx->buffer;
2370 *p = 0;
2371
2372 /* Add any DSN flags to the rcpt command */
2373
2374 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2375 {
2376 if (addr->dsn_flags & rf_dsnflags)
2377 {
2378 int i;
2379 BOOL first = TRUE;
2380
2381 Ustrcpy(p, " NOTIFY=");
2382 while (*p) p++;
2383 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2384 {
2385 if (!first) *p++ = ',';
2386 first = FALSE;
2387 Ustrcpy(p, rf_names[i]);
2388 while (*p) p++;
2389 }
2390 }
2391
2392 if (addr->dsn_orcpt)
2393 {
2394 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2395 addr->dsn_orcpt);
2396 while (*p) p++;
2397 }
2398 }
2399 }
2400
2401
2402 /*************************************************
2403 * Deliver address list to given host *
2404 *************************************************/
2405
2406 /* If continue_hostname is not null, we get here only when continuing to
2407 deliver down an existing channel. The channel was passed as the standard
2408 input. TLS is never active on a passed channel; the previous process always
2409 closes it down before passing the connection on.
2410
2411 Otherwise, we have to make a connection to the remote host, and do the
2412 initial protocol exchange.
2413
2414 When running as an MUA wrapper, if the sender or any recipient is rejected,
2415 temporarily or permanently, we force failure for all recipients.
2416
2417 Arguments:
2418 addrlist chain of potential addresses to deliver; only those whose
2419 transport_return field is set to PENDING_DEFER are currently
2420 being processed; others should be skipped - they have either
2421 been delivered to an earlier host or IP address, or been
2422 failed by one of them.
2423 host host to deliver to
2424 host_af AF_INET or AF_INET6
2425 port default TCP/IP port to use, in host byte order
2426 interface interface to bind to, or NULL
2427 tblock transport instance block
2428 message_defer set TRUE if yield is OK, but all addresses were deferred
2429 because of a non-recipient, non-host failure, that is, a
2430 4xx response to MAIL FROM, DATA, or ".". This is a defer
2431 that is specific to the message.
2432 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2433 a second attempt after TLS initialization fails
2434
2435 Returns: OK - the connection was made and the delivery attempted;
2436 the result for each address is in its data block.
2437 DEFER - the connection could not be made, or something failed
2438 while setting up the SMTP session, or there was a
2439 non-message-specific error, such as a timeout.
2440 ERROR - a filter command is specified for this transport,
2441 and there was a problem setting it up; OR helo_data
2442 or add_headers or authenticated_sender is specified
2443 for this transport, and the string failed to expand
2444 */
2445
2446 static int
2447 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2448 uschar *interface, transport_instance *tblock,
2449 BOOL *message_defer, BOOL suppress_tls)
2450 {
2451 address_item *addr;
2452 address_item *sync_addr;
2453 address_item *first_addr = addrlist;
2454 int yield = OK;
2455 int address_count;
2456 int save_errno;
2457 int rc;
2458 time_t start_delivery_time = time(NULL);
2459
2460 BOOL completed_address = FALSE;
2461
2462
2463 BOOL pass_message = FALSE;
2464 uschar *message = NULL;
2465 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2466 uschar *p;
2467
2468 smtp_context sx;
2469
2470 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2471
2472 sx.addrlist = addrlist;
2473 sx.host = host;
2474 sx.host_af = host_af,
2475 sx.port = port;
2476 sx.interface = interface;
2477 sx.tblock = tblock;
2478
2479 /* Get the channel set up ready for a message (MAIL FROM being the next
2480 SMTP command to send */
2481
2482 if ((rc = smtp_setup_conn(&sx, message_defer, suppress_tls, FALSE)) != OK)
2483 return rc;
2484
2485 /* If there is a filter command specified for this transport, we can now
2486 set it up. This cannot be done until the identify of the host is known. */
2487
2488 if (tblock->filter_command != NULL)
2489 {
2490 BOOL rc;
2491 uschar fbuf[64];
2492 sprintf(CS fbuf, "%.50s transport", tblock->name);
2493 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2494 TRUE, DEFER, addrlist, fbuf, NULL);
2495 transport_filter_timeout = tblock->filter_timeout;
2496
2497 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2498 yield ERROR. */
2499
2500 if (!rc)
2501 {
2502 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2503 FALSE);
2504 yield = ERROR;
2505 goto SEND_QUIT;
2506 }
2507
2508 if ( transport_filter_argv
2509 && *transport_filter_argv
2510 && **transport_filter_argv
2511 && sx.peer_offered & PEER_OFFERED_CHUNKING
2512 )
2513 {
2514 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2515 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2516 }
2517 }
2518
2519
2520 /* For messages that have more than the maximum number of envelope recipients,
2521 we want to send several transactions down the same SMTP connection. (See
2522 comments in deliver.c as to how this reconciles, heuristically, with
2523 remote_max_parallel.) This optimization was added to Exim after the following
2524 code was already working. The simplest way to put it in without disturbing the
2525 code was to use a goto to jump back to this point when there is another
2526 transaction to handle. */
2527
2528 SEND_MESSAGE:
2529 sync_addr = first_addr;
2530 sx.ok = FALSE;
2531 sx.send_rset = TRUE;
2532 completed_address = FALSE;
2533
2534
2535 /* Initiate a message transfer. */
2536
2537 if (build_mailcmd_options(&sx, first_addr) != OK)
2538 {
2539 yield = ERROR;
2540 goto SEND_QUIT;
2541 }
2542
2543 /* From here until we send the DATA command, we can make use of PIPELINING
2544 if the server host supports it. The code has to be able to check the responses
2545 at any point, for when the buffer fills up, so we write it totally generally.
2546 When PIPELINING is off, each command written reports that it has flushed the
2547 buffer. */
2548
2549 sx.pending_MAIL = TRUE; /* The block starts with MAIL */
2550
2551 {
2552 uschar * s = return_path;
2553 #ifdef SUPPORT_I18N
2554 uschar * errstr = NULL;
2555
2556 /* If we must downconvert, do the from-address here. Remember we had to
2557 for the to-addresses (done below), and also (ugly) for re-doing when building
2558 the delivery log line. */
2559
2560 if ( addrlist->prop.utf8_msg
2561 && (addrlist->prop.utf8_downcvt || !(sx.peer_offered & PEER_OFFERED_UTF8))
2562 )
2563 {
2564 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2565 {
2566 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2567 yield = ERROR;
2568 goto SEND_QUIT;
2569 }
2570 setflag(addrlist, af_utf8_downcvt);
2571 }
2572 #endif
2573
2574 rc = smtp_write_command(&sx.outblock, pipelining_active,
2575 "MAIL FROM:<%s>%s\r\n", s, sx.buffer);
2576 }
2577
2578 mail_command = string_copy(big_buffer); /* Save for later error message */
2579
2580 switch(rc)
2581 {
2582 case -1: /* Transmission error */
2583 goto SEND_FAILED;
2584
2585 case +1: /* Block was sent */
2586 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2587 sx.ob->command_timeout))
2588 {
2589 if (errno == 0 && sx.buffer[0] == '4')
2590 {
2591 errno = ERRNO_MAIL4XX;
2592 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2593 }
2594 goto RESPONSE_FAILED;
2595 }
2596 sx.pending_MAIL = FALSE;
2597 break;
2598 }
2599
2600 /* Pass over all the relevant recipient addresses for this host, which are the
2601 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2602 several before we have to read the responses for those seen so far. This
2603 checking is done by a subroutine because it also needs to be done at the end.
2604 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2605 the next one if not all are sent.
2606
2607 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2608 last address because we want to abort if any recipients have any kind of
2609 problem, temporary or permanent. We know that all recipient addresses will have
2610 the PENDING_DEFER status, because only one attempt is ever made, and we know
2611 that max_rcpt will be large, so all addresses will be done at once. */
2612
2613 for (addr = first_addr, address_count = 0;
2614 addr && address_count < sx.max_rcpt;
2615 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2616 {
2617 int count;
2618 BOOL no_flush;
2619 uschar * rcpt_addr;
2620
2621 addr->dsn_aware = sx.peer_offered & PEER_OFFERED_DSN
2622 ? dsn_support_yes : dsn_support_no;
2623
2624 address_count++;
2625 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2626
2627 build_rcptcmd_options(&sx, addr);
2628
2629 /* Now send the RCPT command, and process outstanding responses when
2630 necessary. After a timeout on RCPT, we just end the function, leaving the
2631 yield as OK, because this error can often mean that there is a problem with
2632 just one address, so we don't want to delay the host. */
2633
2634 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2635
2636 #ifdef SUPPORT_I18N
2637 if ( testflag(addrlist, af_utf8_downcvt)
2638 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2639 )
2640 {
2641 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2642 errno = ERRNO_EXPANDFAIL;
2643 goto SEND_FAILED;
2644 }
2645 #endif
2646
2647 count = smtp_write_command(&sx.outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2648 rcpt_addr, sx.igquotstr, sx.buffer);
2649
2650 if (count < 0) goto SEND_FAILED;
2651 if (count > 0)
2652 {
2653 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2654 &sync_addr, host, count, sx.ob->address_retry_include_sender,
2655 sx.pending_MAIL, 0, &sx.inblock, sx.ob->command_timeout, sx.buffer,
2656 sizeof(sx.buffer)))
2657 {
2658 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2659 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2660 break;
2661
2662 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2663 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2664 case 0: /* No 2xx or 5xx, but no probs */
2665 break;
2666
2667 case -1: goto END_OFF; /* Timeout on RCPT */
2668 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2669 }
2670 sx.pending_MAIL = FALSE; /* Dealt with MAIL */
2671 }
2672 } /* Loop for next address */
2673
2674 /*XXX potential break point for verify-callouts here. The MAIL and
2675 RCPT handling is relevant there */
2676
2677 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2678 permanently or temporarily. We should have flushed and synced after the last
2679 RCPT. */
2680
2681 if (mua_wrapper)
2682 {
2683 address_item *badaddr;
2684 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2685 if (badaddr->transport_return != PENDING_OK)
2686 {
2687 /*XXX could we find a better errno than 0 here? */
2688 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2689 testflag(badaddr, af_pass_message));
2690 sx.ok = FALSE;
2691 break;
2692 }
2693 }
2694
2695 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2696 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2697 have a good recipient buffered up if we are pipelining. We don't want to waste
2698 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2699 are pipelining. The responses are all handled by sync_responses().
2700 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2701 to send is. */
2702
2703 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2704 && (sx.ok || (pipelining_active && !mua_wrapper)))
2705 {
2706 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2707
2708 if (count < 0) goto SEND_FAILED;
2709 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2710 host, count, sx.ob->address_retry_include_sender, sx.pending_MAIL,
2711 sx.ok ? +1 : -1, &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2712 {
2713 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2714 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2715 break;
2716
2717 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2718 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2719 case 0: break; /* No 2xx or 5xx, but no probs */
2720
2721 case -1: goto END_OFF; /* Timeout on RCPT */
2722 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2723 }
2724 pipelining_active = FALSE;
2725 data_command = string_copy(big_buffer); /* Save for later error message */
2726 }
2727
2728 /* If there were no good recipients (but otherwise there have been no
2729 problems), just set ok TRUE, since we have handled address-specific errors
2730 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2731 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2732 well as body. Set the appropriate timeout value to be used for each chunk.
2733 (Haven't been able to make it work using select() for writing yet.) */
2734
2735 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2736 {
2737 /* Save the first address of the next batch. */
2738 first_addr = addr;
2739
2740 sx.ok = TRUE;
2741 }
2742 else
2743 {
2744 transport_ctx tctx = {
2745 tblock,
2746 addrlist,
2747 US".", US"..", /* Escaping strings */
2748 topt_use_crlf | topt_escape_headers
2749 | (tblock->body_only ? topt_no_headers : 0)
2750 | (tblock->headers_only ? topt_no_body : 0)
2751 | (tblock->return_path_add ? topt_add_return_path : 0)
2752 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2753 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2754 };
2755
2756 /* If using CHUNKING we need a callback from the generic transport
2757 support to us, for the sending of BDAT smtp commands and the reaping
2758 of responses. The callback needs a whole bunch of state so set up
2759 a transport-context structure to be passed around. */
2760
2761 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2762 {
2763 tctx.check_string = tctx.escape_string = NULL;
2764 tctx.options |= topt_use_bdat;
2765 tctx.chunk_cb = smtp_chunk_cmd_callback;
2766 tctx.inblock = &sx.inblock;
2767 tctx.outblock = &sx.outblock;
2768 tctx.host = host;
2769 tctx.first_addr = first_addr;
2770 tctx.sync_addr = &sync_addr;
2771 tctx.pending_MAIL = sx.pending_MAIL;
2772 tctx.pending_BDAT = FALSE;
2773 tctx.good_RCPT = sx.ok;
2774 tctx.completed_address = &completed_address;
2775 tctx.cmd_count = 0;
2776 tctx.buffer = sx.buffer;
2777 }
2778 else
2779 tctx.options |= topt_end_dot;
2780
2781 /* Save the first address of the next batch. */
2782 first_addr = addr;
2783
2784 /* Responses from CHUNKING commands go in buffer. Otherwise,
2785 there has not been a response. */
2786
2787 sx.buffer[0] = 0;
2788
2789 sigalrm_seen = FALSE;
2790 transport_write_timeout = sx.ob->data_timeout;
2791 smtp_command = US"sending data block"; /* For error messages */
2792 DEBUG(D_transport|D_v)
2793 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2794 debug_printf(" will write message using CHUNKING\n");
2795 else
2796 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2797 transport_count = 0;
2798
2799 #ifndef DISABLE_DKIM
2800 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2801 #else
2802 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2803 #endif
2804
2805 /* transport_write_message() uses write() because it is called from other
2806 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2807 it can exit with "Broken pipe" as its error. This really means that the
2808 socket got closed at the far end. */
2809
2810 transport_write_timeout = 0; /* for subsequent transports */
2811
2812 /* Failure can either be some kind of I/O disaster (including timeout),
2813 or the failure of a transport filter or the expansion of added headers.
2814 Or, when CHUNKING, it can be a protocol-detected failure. */
2815
2816 if (!sx.ok)
2817 goto RESPONSE_FAILED;
2818
2819 /* We used to send the terminating "." explicitly here, but because of
2820 buffering effects at both ends of TCP/IP connections, you don't gain
2821 anything by keeping it separate, so it might as well go in the final
2822 data buffer for efficiency. This is now done by setting the topt_end_dot
2823 flag above. */
2824
2825 smtp_command = US"end of data";
2826
2827 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2828 {
2829 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2830 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2831 host, tctx.cmd_count-1, sx.ob->address_retry_include_sender,
2832 sx.pending_MAIL, 0,
2833 &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
2834 {
2835 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2836 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2837 break;
2838
2839 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2840 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2841 case 0: break; /* No 2xx or 5xx, but no probs */
2842
2843 case -1: goto END_OFF; /* Timeout on RCPT */
2844 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2845 }
2846 }
2847
2848 #ifndef DISABLE_PRDR
2849 /* For PRDR we optionally get a partial-responses warning
2850 * followed by the individual responses, before going on with
2851 * the overall response. If we don't get the warning then deal
2852 * with per non-PRDR. */
2853 if(sx.prdr_active)
2854 {
2855 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2856 sx.ob->final_timeout);
2857 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2858 {
2859 case '2': sx.prdr_active = FALSE;
2860 sx.ok = TRUE;
2861 break;
2862 case '4': errno = ERRNO_DATA4XX;
2863 addrlist->more_errno |=
2864 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2865 break;
2866 }
2867 }
2868 else
2869 #endif
2870
2871 /* For non-PRDR SMTP, we now read a single response that applies to the
2872 whole message. If it is OK, then all the addresses have been delivered. */
2873
2874 if (!sx.lmtp)
2875 {
2876 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2877 sx.ob->final_timeout);
2878 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2879 {
2880 errno = ERRNO_DATA4XX;
2881 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2882 }
2883 }
2884
2885 /* For LMTP, we get back a response for every RCPT command that we sent;
2886 some may be accepted and some rejected. For those that get a response, their
2887 status is fixed; any that are accepted have been handed over, even if later
2888 responses crash - at least, that's how I read RFC 2033.
2889
2890 If all went well, mark the recipient addresses as completed, record which
2891 host/IPaddress they were delivered to, and cut out RSET when sending another
2892 message down the same channel. Write the completed addresses to the journal
2893 now so that they are recorded in case there is a crash of hardware or
2894 software before the spool gets updated. Also record the final SMTP
2895 confirmation if needed (for SMTP only). */
2896
2897 if (sx.ok)
2898 {
2899 int flag = '=';
2900 int delivery_time = (int)(time(NULL) - start_delivery_time);
2901 int len;
2902 uschar *conf = NULL;
2903
2904 sx.send_rset = FALSE;
2905 pipelining_active = FALSE;
2906
2907 /* Set up confirmation if needed - applies only to SMTP */
2908
2909 if (
2910 #ifdef DISABLE_EVENT
2911 LOGGING(smtp_confirmation) &&
2912 #endif
2913 !sx.lmtp
2914 )
2915 {
2916 const uschar *s = string_printing(sx.buffer);
2917 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2918 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2919 }
2920
2921 /* Process all transported addresses - for LMTP or PRDR, read a status for
2922 each one. */
2923
2924 for (addr = addrlist; addr != first_addr; addr = addr->next)
2925 {
2926 if (addr->transport_return != PENDING_OK) continue;
2927
2928 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2929 remaining addresses. Otherwise, it's a return code for just the one
2930 address. For temporary errors, add a retry item for the address so that
2931 it doesn't get tried again too soon. */
2932
2933 #ifndef DISABLE_PRDR
2934 if (sx.lmtp || sx.prdr_active)
2935 #else
2936 if (sx.lmtp)
2937 #endif
2938 {
2939 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2940 sx.ob->final_timeout))
2941 {
2942 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2943 addr->message = string_sprintf(
2944 #ifndef DISABLE_PRDR
2945 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2946 #else
2947 "LMTP error after %s: %s",
2948 #endif
2949 data_command, string_printing(sx.buffer));
2950 setflag(addr, af_pass_message); /* Allow message to go to user */
2951 if (sx.buffer[0] == '5')
2952 addr->transport_return = FAIL;
2953 else
2954 {
2955 errno = ERRNO_DATA4XX;
2956 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2957 addr->transport_return = DEFER;
2958 #ifndef DISABLE_PRDR
2959 if (!sx.prdr_active)
2960 #endif
2961 retry_add_item(addr, addr->address_retry_key, 0);
2962 }
2963 continue;
2964 }
2965 completed_address = TRUE; /* NOW we can set this flag */
2966 if (LOGGING(smtp_confirmation))
2967 {
2968 const uschar *s = string_printing(sx.buffer);
2969 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2970 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2971 }
2972 }
2973
2974 /* SMTP, or success return from LMTP for this address. Pass back the
2975 actual host that was used. */
2976
2977 addr->transport_return = OK;
2978 addr->more_errno = delivery_time;
2979 addr->host_used = host;
2980 addr->special_action = flag;
2981 addr->message = conf;
2982 #ifndef DISABLE_PRDR
2983 if (sx.prdr_active) addr->flags |= af_prdr_used;
2984 #endif
2985 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2986 flag = '-';
2987
2988 #ifndef DISABLE_PRDR
2989 if (!sx.prdr_active)
2990 #endif
2991 {
2992 /* Update the journal. For homonymic addresses, use the base address plus
2993 the transport name. See lots of comments in deliver.c about the reasons
2994 for the complications when homonyms are involved. Just carry on after
2995 write error, as it may prove possible to update the spool file later. */
2996
2997 if (testflag(addr, af_homonym))
2998 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2999 else
3000 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3001
3002 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
3003 len = Ustrlen(CS sx.buffer);
3004 if (write(journal_fd, sx.buffer, len) != len)
3005 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3006 "%s: %s", sx.buffer, strerror(errno));
3007 }
3008 }
3009
3010 #ifndef DISABLE_PRDR
3011 if (sx.prdr_active)
3012 {
3013 /* PRDR - get the final, overall response. For any non-success
3014 upgrade all the address statuses. */
3015 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3016 sx.ob->final_timeout);
3017 if (!sx.ok)
3018 {
3019 if(errno == 0 && sx.buffer[0] == '4')
3020 {
3021 errno = ERRNO_DATA4XX;
3022 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3023 }
3024 for (addr = addrlist; addr != first_addr; addr = addr->next)
3025 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3026 addr->transport_return = PENDING_OK; /* allow set_errno action */
3027 goto RESPONSE_FAILED;
3028 }
3029
3030 /* Update the journal, or setup retry. */
3031 for (addr = addrlist; addr != first_addr; addr = addr->next)
3032 if (addr->transport_return == OK)
3033 {
3034 if (testflag(addr, af_homonym))
3035 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3036 else
3037 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3038
3039 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3040 len = Ustrlen(CS sx.buffer);
3041 if (write(journal_fd, sx.buffer, len) != len)
3042 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3043 "%s: %s", sx.buffer, strerror(errno));
3044 }
3045 else if (addr->transport_return == DEFER)
3046 retry_add_item(addr, addr->address_retry_key, -2);
3047 }
3048 #endif
3049
3050 /* Ensure the journal file is pushed out to disk. */
3051
3052 if (EXIMfsync(journal_fd) < 0)
3053 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3054 strerror(errno));
3055 }
3056 }
3057
3058
3059 /* Handle general (not specific to one address) failures here. The value of ok
3060 is used to skip over this code on the falling through case. A timeout causes a
3061 deferral. Other errors may defer or fail according to the response code, and
3062 may set up a special errno value, e.g. after connection chopped, which is
3063 assumed if errno == 0 and there is no text in the buffer. If control reaches
3064 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3065 the problem is not related to this specific message. */
3066
3067 if (!sx.ok)
3068 {
3069 int code, set_rc;
3070 uschar * set_message;
3071
3072 RESPONSE_FAILED:
3073 {
3074 save_errno = errno;
3075 message = NULL;
3076 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3077 sx.buffer, &code, &message, &pass_message);
3078 goto FAILED;
3079 }
3080
3081 SEND_FAILED:
3082 {
3083 save_errno = errno;
3084 code = '4';
3085 message = US string_sprintf("send() to %s [%s] failed: %s",
3086 host->name, host->address, strerror(save_errno));
3087 sx.send_quit = FALSE;
3088 goto FAILED;
3089 }
3090
3091 FAILED:
3092 {
3093 BOOL message_error;
3094
3095 sx.ok = FALSE; /* For when reached by GOTO */
3096 set_message = message;
3097
3098 /* We want to handle timeouts after MAIL or "." and loss of connection after
3099 "." specially. They can indicate a problem with the sender address or with
3100 the contents of the message rather than a real error on the connection. These
3101 cases are treated in the same way as a 4xx response. This next bit of code
3102 does the classification. */
3103
3104 switch(save_errno)
3105 {
3106 case 0:
3107 case ERRNO_MAIL4XX:
3108 case ERRNO_DATA4XX:
3109 message_error = TRUE;
3110 break;
3111
3112 case ETIMEDOUT:
3113 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3114 Ustrncmp(smtp_command,"end ",4) == 0;
3115 break;
3116
3117 case ERRNO_SMTPCLOSED:
3118 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3119 break;
3120
3121 default:
3122 message_error = FALSE;
3123 break;
3124 }
3125
3126 /* Handle the cases that are treated as message errors. These are:
3127
3128 (a) negative response or timeout after MAIL
3129 (b) negative response after DATA
3130 (c) negative response or timeout or dropped connection after "."
3131 (d) utf8 support required and not offered
3132
3133 It won't be a negative response or timeout after RCPT, as that is dealt
3134 with separately above. The action in all cases is to set an appropriate
3135 error code for all the addresses, but to leave yield set to OK because the
3136 host itself has not failed. Of course, it might in practice have failed
3137 when we've had a timeout, but if so, we'll discover that at the next
3138 delivery attempt. For a temporary error, set the message_defer flag, and
3139 write to the logs for information if this is not the last host. The error
3140 for the last host will be logged as part of the address's log line. */
3141
3142 if (message_error)
3143 {
3144 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3145
3146 /* If there's an errno, the message contains just the identity of
3147 the host. */
3148
3149 if (code == '5')
3150 set_rc = FAIL;
3151 else /* Anything other than 5 is treated as temporary */
3152 {
3153 set_rc = DEFER;
3154 if (save_errno > 0)
3155 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3156 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3157 msglog_line(host, message);
3158 *message_defer = TRUE;
3159 }
3160 }
3161
3162 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3163 ".", or some other transportation error. We defer all addresses and yield
3164 DEFER, except for the case of failed add_headers expansion, or a transport
3165 filter failure, when the yield should be ERROR, to stop it trying other
3166 hosts. */
3167
3168 else
3169 {
3170 set_rc = DEFER;
3171 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3172 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3173 }
3174 }
3175
3176 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3177 #ifdef EXPERIMENTAL_DSN_INFO
3178 , sx.smtp_greeting, sx.helo_response
3179 #endif
3180 );
3181 }
3182
3183
3184 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3185 SMTP session tidily. However, if there were too many addresses to send in one
3186 message (indicated by first_addr being non-NULL) we want to carry on with the
3187 rest of them. Also, it is desirable to send more than one message down the SMTP
3188 connection if there are several waiting, provided we haven't already sent so
3189 many as to hit the configured limit. The function transport_check_waiting looks
3190 for a waiting message and returns its id. Then transport_pass_socket tries to
3191 set up a continued delivery by passing the socket on to another process. The
3192 variable send_rset is FALSE if a message has just been successfully transfered.
3193
3194 If we are already sending down a continued channel, there may be further
3195 addresses not yet delivered that are aimed at the same host, but which have not
3196 been passed in this run of the transport. In this case, continue_more will be
3197 true, and all we should do is send RSET if necessary, and return, leaving the
3198 channel open.
3199
3200 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3201 do not want to continue with other messages down the same channel, because that
3202 can lead to looping between two or more messages, all with the same,
3203 temporarily failing address(es). [The retry information isn't updated yet, so
3204 new processes keep on trying.] We probably also don't want to try more of this
3205 message's addresses either.
3206
3207 If we have started a TLS session, we have to end it before passing the
3208 connection to a new process. However, not all servers can handle this (Exim
3209 can), so we do not pass such a connection on if the host matches
3210 hosts_nopass_tls. */
3211
3212 DEBUG(D_transport)
3213 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3214 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3215 sx.send_rset, continue_more, yield, first_addr ? "not " : "");
3216
3217 if (completed_address && sx.ok && sx.send_quit)
3218 {
3219 BOOL more;
3220 smtp_compare_t t_compare;
3221
3222 t_compare.tblock = tblock;
3223 t_compare.current_sender_address = sender_address;
3224
3225 if ( first_addr != NULL
3226 || continue_more
3227 || ( ( tls_out.active < 0
3228 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3229 )
3230 &&
3231 transport_check_waiting(tblock->name, host->name,
3232 tblock->connection_max_messages, new_message_id, &more,
3233 (oicf)smtp_are_same_identities, (void*)&t_compare)
3234 ) )
3235 {
3236 uschar *msg;
3237 BOOL pass_message;
3238
3239 if (sx.send_rset)
3240 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3241 {
3242 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3243 host->address, strerror(save_errno));
3244 sx.send_quit = FALSE;
3245 }
3246 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3247 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3248 {
3249 int code;
3250 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3251 &pass_message);
3252 if (!sx.send_quit)
3253 {
3254 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3255 host->name, host->address, msg);
3256 }
3257 }
3258
3259 /* Either RSET was not needed, or it succeeded */
3260
3261 if (sx.ok)
3262 {
3263 if (first_addr != NULL) /* More addresses still to be sent */
3264 { /* in this run of the transport */
3265 continue_sequence++; /* Causes * in logging */
3266 goto SEND_MESSAGE;
3267 }
3268 if (continue_more) return yield; /* More addresses for another run */
3269
3270 /* Pass the socket to a new Exim process. Before doing so, we must shut
3271 down TLS. Not all MTAs allow for the continuation of the SMTP session
3272 when TLS is shut down. We test for this by sending a new EHLO. If we
3273 don't get a good response, we don't attempt to pass the socket on. */
3274
3275 #ifdef SUPPORT_TLS
3276 if (tls_out.active >= 0)
3277 {
3278 tls_close(FALSE, TRUE);
3279 smtp_peer_options = smtp_peer_options_wrap;
3280 sx.ok = !sx.smtps
3281 && smtp_write_command(&sx.outblock, FALSE,
3282 "EHLO %s\r\n", sx.helo_data) >= 0
3283 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3284 '2', sx.ob->command_timeout);
3285 }
3286 #endif
3287
3288 /* If the socket is successfully passed, we mustn't send QUIT (or
3289 indeed anything!) from here. */
3290
3291 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3292 propagate it from the initial
3293 */
3294 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3295 host->address, new_message_id, sx.inblock.sock))
3296 sx.send_quit = FALSE;
3297 }
3298
3299 /* If RSET failed and there are addresses left, they get deferred. */
3300
3301 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3302 #ifdef EXPERIMENTAL_DSN_INFO
3303 , sx.smtp_greeting, sx.helo_response
3304 #endif
3305 );
3306 }
3307 }
3308
3309 /* End off tidily with QUIT unless the connection has died or the socket has
3310 been passed to another process. There has been discussion on the net about what
3311 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3312 to wait for a response, but on the other hand, there isn't anything one can do
3313 with an error response, other than log it. Exim used to do that. However,
3314 further discussion suggested that it is positively advantageous not to wait for
3315 the response, but to close the session immediately. This is supposed to move
3316 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3317 load from the server. (Hosts that are both servers and clients may not see much
3318 difference, of course.) Further discussion indicated that this was safe to do
3319 on Unix systems which have decent implementations of TCP/IP that leave the
3320 connection around for a while (TIME_WAIT) after the application has gone away.
3321 This enables the response sent by the server to be properly ACKed rather than
3322 timed out, as can happen on broken TCP/IP implementations on other OS.
3323
3324 This change is being made on 31-Jul-98. After over a year of trouble-free
3325 operation, the old commented-out code was removed on 17-Sep-99. */
3326
3327 SEND_QUIT:
3328 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3329
3330 END_OFF:
3331
3332 #ifdef SUPPORT_TLS
3333 tls_close(FALSE, TRUE);
3334 #endif
3335
3336 /* Close the socket, and return the appropriate value, first setting
3337 works because the NULL setting is passed back to the calling process, and
3338 remote_max_parallel is forced to 1 when delivering over an existing connection,
3339
3340 If all went well and continue_more is set, we shouldn't actually get here if
3341 there are further addresses, as the return above will be taken. However,
3342 writing RSET might have failed, or there may be other addresses whose hosts are
3343 specified in the transports, and therefore not visible at top level, in which
3344 case continue_more won't get set. */
3345
3346 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3347 if (sx.send_quit)
3348 {
3349 shutdown(sx.outblock.sock, SHUT_WR);
3350 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3351 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3352 rc--; /* drain socket */
3353 }
3354 (void)close(sx.inblock.sock);
3355
3356 #ifndef DISABLE_EVENT
3357 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3358 #endif
3359
3360 continue_transport = NULL;
3361 continue_hostname = NULL;
3362 return yield;
3363 }
3364
3365
3366
3367
3368 /*************************************************
3369 * Closedown entry point *
3370 *************************************************/
3371
3372 /* This function is called when exim is passed an open smtp channel
3373 from another incarnation, but the message which it has been asked
3374 to deliver no longer exists. The channel is on stdin.
3375
3376 We might do fancy things like looking for another message to send down
3377 the channel, but if the one we sought has gone, it has probably been
3378 delivered by some other process that itself will seek further messages,
3379 so just close down our connection.
3380
3381 Argument: pointer to the transport instance block
3382 Returns: nothing
3383 */
3384
3385 void
3386 smtp_transport_closedown(transport_instance *tblock)
3387 {
3388 smtp_transport_options_block *ob =
3389 (smtp_transport_options_block *)(tblock->options_block);
3390 smtp_inblock inblock;
3391 smtp_outblock outblock;
3392 uschar buffer[256];
3393 uschar inbuffer[4096];
3394 uschar outbuffer[16];
3395
3396 inblock.sock = fileno(stdin);
3397 inblock.buffer = inbuffer;
3398 inblock.buffersize = sizeof(inbuffer);
3399 inblock.ptr = inbuffer;
3400 inblock.ptrend = inbuffer;
3401
3402 outblock.sock = inblock.sock;
3403 outblock.buffersize = sizeof(outbuffer);
3404 outblock.buffer = outbuffer;
3405 outblock.ptr = outbuffer;
3406 outblock.cmd_count = 0;
3407 outblock.authenticating = FALSE;
3408
3409 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3410 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3411 ob->command_timeout);
3412 (void)close(inblock.sock);
3413 }
3414
3415
3416
3417 /*************************************************
3418 * Prepare addresses for delivery *
3419 *************************************************/
3420
3421 /* This function is called to flush out error settings from previous delivery
3422 attempts to other hosts. It also records whether we got here via an MX record
3423 or not in the more_errno field of the address. We are interested only in
3424 addresses that are still marked DEFER - others may have got delivered to a
3425 previously considered IP address. Set their status to PENDING_DEFER to indicate
3426 which ones are relevant this time.
3427
3428 Arguments:
3429 addrlist the list of addresses
3430 host the host we are delivering to
3431
3432 Returns: the first address for this delivery
3433 */
3434
3435 static address_item *
3436 prepare_addresses(address_item *addrlist, host_item *host)
3437 {
3438 address_item *first_addr = NULL;
3439 address_item *addr;
3440 for (addr = addrlist; addr; addr = addr->next)
3441 if (addr->transport_return == DEFER)
3442 {
3443 if (!first_addr) first_addr = addr;
3444 addr->transport_return = PENDING_DEFER;
3445 addr->basic_errno = 0;
3446 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3447 addr->message = NULL;
3448 #ifdef SUPPORT_TLS
3449 addr->cipher = NULL;
3450 addr->ourcert = NULL;
3451 addr->peercert = NULL;
3452 addr->peerdn = NULL;
3453 addr->ocsp = OCSP_NOT_REQ;
3454 #endif
3455 #ifdef EXPERIMENTAL_DSN_INFO
3456 addr->smtp_greeting = NULL;
3457 addr->helo_response = NULL;
3458 #endif
3459 }
3460 return first_addr;
3461 }
3462
3463
3464
3465 /*************************************************
3466 * Main entry point *
3467 *************************************************/
3468
3469 /* See local README for interface details. As this is a remote transport, it is
3470 given a chain of addresses to be delivered in one connection, if possible. It
3471 always returns TRUE, indicating that each address has its own independent
3472 status set, except if there is a setting up problem, in which case it returns
3473 FALSE. */
3474
3475 BOOL
3476 smtp_transport_entry(
3477 transport_instance *tblock, /* data for this instantiation */
3478 address_item *addrlist) /* addresses we are working on */
3479 {
3480 int cutoff_retry;
3481 int port;
3482 int hosts_defer = 0;
3483 int hosts_fail = 0;
3484 int hosts_looked_up = 0;
3485 int hosts_retry = 0;
3486 int hosts_serial = 0;
3487 int hosts_total = 0;
3488 int total_hosts_tried = 0;
3489 address_item *addr;
3490 BOOL expired = TRUE;
3491 uschar *expanded_hosts = NULL;
3492 uschar *pistring;
3493 uschar *tid = string_sprintf("%s transport", tblock->name);
3494 smtp_transport_options_block *ob =
3495 (smtp_transport_options_block *)(tblock->options_block);
3496 host_item *hostlist = addrlist->host_list;
3497 host_item *host = NULL;
3498
3499 DEBUG(D_transport)
3500 {
3501 debug_printf("%s transport entered\n", tblock->name);
3502 for (addr = addrlist; addr; addr = addr->next)
3503 debug_printf(" %s\n", addr->address);
3504 if (hostlist)
3505 {
3506 debug_printf("hostlist:\n");
3507 for (host = hostlist; host; host = host->next)
3508 debug_printf(" %s:%d\n", host->name, host->port);
3509 }
3510 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3511 continue_hostname, continue_host_address);
3512 }
3513
3514 /* Set the flag requesting that these hosts be added to the waiting
3515 database if the delivery fails temporarily or if we are running with
3516 queue_smtp or a 2-stage queue run. This gets unset for certain
3517 kinds of error, typically those that are specific to the message. */
3518
3519 update_waiting = TRUE;
3520
3521 /* If a host list is not defined for the addresses - they must all have the
3522 same one in order to be passed to a single transport - or if the transport has
3523 a host list with hosts_override set, use the host list supplied with the
3524 transport. It is an error for this not to exist. */
3525
3526 if (!hostlist || (ob->hosts_override && ob->hosts))
3527 {
3528 if (!ob->hosts)
3529 {
3530 addrlist->message = string_sprintf("%s transport called with no hosts set",
3531 tblock->name);
3532 addrlist->transport_return = PANIC;
3533 return FALSE; /* Only top address has status */
3534 }
3535
3536 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3537 ob->hosts);
3538
3539 /* If the transport's host list contains no '$' characters, and we are not
3540 randomizing, it is fixed and therefore a chain of hosts can be built once
3541 and for all, and remembered for subsequent use by other calls to this
3542 transport. If, on the other hand, the host list does contain '$', or we are
3543 randomizing its order, we have to rebuild it each time. In the fixed case,
3544 as the hosts string will never be used again, it doesn't matter that we
3545 replace all the : characters with zeros. */
3546
3547 if (!ob->hostlist)
3548 {
3549 uschar *s = ob->hosts;
3550
3551 if (Ustrchr(s, '$') != NULL)
3552 {
3553 if (!(expanded_hosts = expand_string(s)))
3554 {
3555 addrlist->message = string_sprintf("failed to expand list of hosts "
3556 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3557 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3558 return FALSE; /* Only top address has status */
3559 }
3560 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3561 "\"%s\"\n", s, expanded_hosts);
3562 s = expanded_hosts;
3563 }
3564 else
3565 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3566
3567 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3568
3569 /* Check that the expansion yielded something useful. */
3570 if (!hostlist)
3571 {
3572 addrlist->message =
3573 string_sprintf("%s transport has empty hosts setting", tblock->name);
3574 addrlist->transport_return = PANIC;
3575 return FALSE; /* Only top address has status */
3576 }
3577
3578 /* If there was no expansion of hosts, save the host list for
3579 next time. */
3580
3581 if (!expanded_hosts) ob->hostlist = hostlist;
3582 }
3583
3584 /* This is not the first time this transport has been run in this delivery;
3585 the host list was built previously. */
3586
3587 else
3588 hostlist = ob->hostlist;
3589 }
3590
3591 /* The host list was supplied with the address. If hosts_randomize is set, we
3592 must sort it into a random order if it did not come from MX records and has not
3593 already been randomized (but don't bother if continuing down an existing
3594 connection). */
3595
3596 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3597 {
3598 host_item *newlist = NULL;
3599 while (hostlist)
3600 {
3601 host_item *h = hostlist;
3602 hostlist = hostlist->next;
3603
3604 h->sort_key = random_number(100);
3605
3606 if (!newlist)
3607 {
3608 h->next = NULL;
3609 newlist = h;
3610 }
3611 else if (h->sort_key < newlist->sort_key)
3612 {
3613 h->next = newlist;
3614 newlist = h;
3615 }
3616 else
3617 {
3618 host_item *hh = newlist;
3619 while (hh->next)
3620 {
3621 if (h->sort_key < hh->next->sort_key) break;
3622 hh = hh->next;
3623 }
3624 h->next = hh->next;
3625 hh->next = h;
3626 }
3627 }
3628
3629 hostlist = addrlist->host_list = newlist;
3630 }
3631
3632 /* Sort out the default port. */
3633
3634 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3635
3636 /* For each host-plus-IP-address on the list:
3637
3638 . If this is a continued delivery and the host isn't the one with the
3639 current connection, skip.
3640
3641 . If the status is unusable (i.e. previously failed or retry checked), skip.
3642
3643 . If no IP address set, get the address, either by turning the name into
3644 an address, calling gethostbyname if gethostbyname is on, or by calling
3645 the DNS. The DNS may yield multiple addresses, in which case insert the
3646 extra ones into the list.
3647
3648 . Get the retry data if not previously obtained for this address and set the
3649 field which remembers the state of this address. Skip if the retry time is
3650 not reached. If not, remember whether retry data was found. The retry string
3651 contains both the name and the IP address.
3652
3653 . Scan the list of addresses and mark those whose status is DEFER as
3654 PENDING_DEFER. These are the only ones that will be processed in this cycle
3655 of the hosts loop.
3656
3657 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3658 Some addresses may be successfully delivered, others may fail, and yet
3659 others may get temporary errors and so get marked DEFER.
3660
3661 . The return from the delivery attempt is OK if a connection was made and a
3662 valid SMTP dialogue was completed. Otherwise it is DEFER.
3663
3664 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3665
3666 . If fail to connect, or other defer state, add a retry item.
3667
3668 . If there are any addresses whose status is still DEFER, carry on to the
3669 next host/IPaddress, unless we have tried the number of hosts given
3670 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3671 there is some fancy logic for hosts_max_try that means its limit can be
3672 overstepped in some circumstances.
3673
3674 If we get to the end of the list, all hosts have deferred at least one address,
3675 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3676 delivery attempt to those hosts whose last try was before the arrival time of
3677 the current message. To cope with this, we have to go round the loop a second
3678 time. After that, set the status and error data for any addresses that haven't
3679 had it set already. */
3680
3681 for (cutoff_retry = 0;
3682 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3683 cutoff_retry++)
3684 {
3685 host_item *nexthost = NULL;
3686 int unexpired_hosts_tried = 0;
3687
3688 for (host = hostlist;
3689 host
3690 && unexpired_hosts_tried < ob->hosts_max_try
3691 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3692 host = nexthost)
3693 {
3694 int rc;
3695 int host_af;
3696 uschar *rs;
3697 BOOL host_is_expired = FALSE;
3698 BOOL message_defer = FALSE;
3699 BOOL some_deferred = FALSE;
3700 address_item *first_addr = NULL;
3701 uschar *interface = NULL;
3702 uschar *retry_host_key = NULL;
3703 uschar *retry_message_key = NULL;
3704 uschar *serialize_key = NULL;
3705
3706 /* Default next host is next host. :-) But this can vary if the
3707 hosts_max_try limit is hit (see below). It may also be reset if a host
3708 address is looked up here (in case the host was multihomed). */
3709
3710 nexthost = host->next;
3711
3712 /* If the address hasn't yet been obtained from the host name, look it up
3713 now, unless the host is already marked as unusable. If it is marked as
3714 unusable, it means that the router was unable to find its IP address (in
3715 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3716 the lookup failed last time. We don't get this far if *all* MX records
3717 point to non-existent hosts; that is treated as a hard error.
3718
3719 We can just skip this host entirely. When the hosts came from the router,
3720 the address will timeout based on the other host(s); when the address is
3721 looked up below, there is an explicit retry record added.
3722
3723 Note that we mustn't skip unusable hosts if the address is not unset; they
3724 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3725
3726 if (!host->address)
3727 {
3728 int new_port, flags;
3729 host_item *hh;
3730
3731 if (host->status >= hstatus_unusable)
3732 {
3733 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3734 host->name);
3735 continue;
3736 }
3737
3738 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3739
3740 /* The host name is permitted to have an attached port. Find it, and
3741 strip it from the name. Just remember it for now. */
3742
3743 new_port = host_item_get_port(host);
3744
3745 /* Count hosts looked up */
3746
3747 hosts_looked_up++;
3748
3749 /* Find by name if so configured, or if it's an IP address. We don't
3750 just copy the IP address, because we need the test-for-local to happen. */
3751
3752 flags = HOST_FIND_BY_A;
3753 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3754 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3755
3756 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3757 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3758 else
3759 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3760 &ob->dnssec, /* domains for request/require */
3761 NULL, NULL);
3762
3763 /* Update the host (and any additional blocks, resulting from
3764 multihoming) with a host-specific port, if any. */
3765
3766 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3767
3768 /* Failure to find the host at this time (usually DNS temporary failure)
3769 is really a kind of routing failure rather than a transport failure.
3770 Therefore we add a retry item of the routing kind, not to stop us trying
3771 to look this name up here again, but to ensure the address gets timed
3772 out if the failures go on long enough. A complete failure at this point
3773 commonly points to a configuration error, but the best action is still
3774 to carry on for the next host. */
3775
3776 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3777 {
3778 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3779 expired = FALSE;
3780 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3781 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3782 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3783 host->status = hstatus_unusable;
3784
3785 for (addr = addrlist; addr; addr = addr->next)
3786 {
3787 if (addr->transport_return != DEFER) continue;
3788 addr->basic_errno = ERRNO_UNKNOWNHOST;
3789 addr->message =
3790 string_sprintf("failed to lookup IP address for %s", host->name);
3791 }
3792 continue;
3793 }
3794
3795 /* If the host is actually the local host, we may have a problem, or
3796 there may be some cunning configuration going on. In the problem case,
3797 log things and give up. The default transport status is already DEFER. */
3798
3799 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3800 {
3801 for (addr = addrlist; addr; addr = addr->next)
3802 {
3803 addr->basic_errno = 0;
3804 addr->message = string_sprintf("%s transport found host %s to be "
3805 "local", tblock->name, host->name);
3806 }
3807 goto END_TRANSPORT;
3808 }
3809 } /* End of block for IP address lookup */
3810
3811 /* If this is a continued delivery, we are interested only in the host
3812 which matches the name of the existing open channel. The check is put
3813 here after the local host lookup, in case the name gets expanded as a
3814 result of the lookup. Set expired FALSE, to save the outer loop executing
3815 twice. */
3816
3817 if ( continue_hostname
3818 && ( Ustrcmp(continue_hostname, host->name) != 0
3819 || Ustrcmp(continue_host_address, host->address) != 0
3820 ) )
3821 {
3822 expired = FALSE;
3823 continue; /* With next host */
3824 }
3825
3826 /* Reset the default next host in case a multihomed host whose addresses
3827 are not looked up till just above added to the host list. */
3828
3829 nexthost = host->next;
3830
3831 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3832 domain is in queue_smtp_domains, we don't actually want to attempt any
3833 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3834 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3835 were not in it. We don't want to hold up all SMTP deliveries! Except when
3836 doing a two-stage queue run, don't do this if forcing. */
3837
3838 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3839 match_isinlist(addrlist->domain,
3840 (const uschar **)&queue_smtp_domains, 0,
3841 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3842 {
3843 expired = FALSE;
3844 for (addr = addrlist; addr; addr = addr->next)
3845 if (addr->transport_return == DEFER)
3846 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3847 continue; /* With next host */
3848 }
3849
3850 /* Count hosts being considered - purely for an intelligent comment
3851 if none are usable. */
3852
3853 hosts_total++;
3854
3855 /* Set $host and $host address now in case they are needed for the
3856 interface expansion or the serialize_hosts check; they remain set if an
3857 actual delivery happens. */
3858
3859 deliver_host = host->name;
3860 deliver_host_address = host->address;
3861 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3862 : host->dnssec == DS_NO ? US"no"
3863 : US"";
3864
3865 /* Set up a string for adding to the retry key if the port number is not
3866 the standard SMTP port. A host may have its own port setting that overrides
3867 the default. */
3868
3869 pistring = string_sprintf(":%d", host->port == PORT_NONE
3870 ? port : host->port);
3871 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3872
3873 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3874 string is set, even if constant (as different transports can have different
3875 constant settings), we must add it to the key that is used for retries,
3876 because connections to the same host from a different interface should be
3877 treated separately. */
3878
3879 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3880 if ((rs = ob->interface) && *rs)
3881 {
3882 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3883 return FALSE;
3884 pistring = string_sprintf("%s/%s", pistring, interface);
3885 }
3886
3887 /* The first time round the outer loop, check the status of the host by
3888 inspecting the retry data. The second time round, we are interested only
3889 in expired hosts that haven't been tried since this message arrived. */
3890
3891 if (cutoff_retry == 0)
3892 {
3893 BOOL incl_ip;
3894 /* Ensure the status of the address is set by checking retry data if
3895 necessary. There may be host-specific retry data (applicable to all
3896 messages) and also data for retries of a specific message at this host.
3897 If either of these retry records are actually read, the keys used are
3898 returned to save recomputing them later. */
3899
3900 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3901 US"retry_include_ip_address", ob->retry_include_ip_address,
3902 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3903 continue; /* with next host */
3904
3905 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3906 incl_ip, &retry_host_key, &retry_message_key);
3907
3908 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3909 (host->address == NULL)? US"" : host->address, pistring,
3910 (host->status == hstatus_usable)? "usable" :
3911 (host->status == hstatus_unusable)? "unusable" :
3912 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3913
3914 /* Skip this address if not usable at this time, noting if it wasn't
3915 actually expired, both locally and in the address. */
3916
3917 switch (host->status)
3918 {
3919 case hstatus_unusable:
3920 expired = FALSE;
3921 setflag(addrlist, af_retry_skipped);
3922 /* Fall through */
3923
3924 case hstatus_unusable_expired:
3925 switch (host->why)
3926 {
3927 case hwhy_retry: hosts_retry++; break;
3928 case hwhy_failed: hosts_fail++; break;
3929 case hwhy_deferred: hosts_defer++; break;
3930 }
3931
3932 /* If there was a retry message key, implying that previously there
3933 was a message-specific defer, we don't want to update the list of
3934 messages waiting for these hosts. */
3935
3936 if (retry_message_key) update_waiting = FALSE;
3937 continue; /* With the next host or IP address */
3938 }
3939 }
3940
3941 /* Second time round the loop: if the address is set but expired, and
3942 the message is newer than the last try, let it through. */
3943
3944 else
3945 {
3946 if ( !host->address
3947 || host->status != hstatus_unusable_expired
3948 || host->last_try > received_time)
3949 continue;
3950 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3951 host->name, host->address, pistring);
3952 host_is_expired = TRUE;
3953 }
3954
3955 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3956 it remains TRUE only if all hosts are expired and none are actually tried.
3957 */
3958
3959 expired = FALSE;
3960
3961 /* If this host is listed as one to which access must be serialized,
3962 see if another Exim process has a connection to it, and if so, skip
3963 this host. If not, update the database to record our connection to it
3964 and remember this for later deletion. Do not do any of this if we are
3965 sending the message down a pre-existing connection. */
3966
3967 if ( !continue_hostname
3968 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3969 {
3970 serialize_key = string_sprintf("host-serialize-%s", host->name);
3971 if (!enq_start(serialize_key, 1))
3972 {
3973 DEBUG(D_transport)
3974 debug_printf("skipping host %s because another Exim process "
3975 "is connected to it\n", host->name);
3976 hosts_serial++;
3977 continue;
3978 }
3979 }
3980
3981 /* OK, we have an IP address that is not waiting for its retry time to
3982 arrive (it might be expired) OR (second time round the loop) we have an
3983 expired host that hasn't been tried since the message arrived. Have a go
3984 at delivering the message to it. First prepare the addresses by flushing
3985 out the result of previous attempts, and finding the first address that
3986 is still to be delivered. */
3987
3988 first_addr = prepare_addresses(addrlist, host);
3989
3990 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3991 message_id, host->name, host->address, addrlist->address,
3992 addrlist->next ? ", ..." : "");
3993
3994 set_process_info("delivering %s to %s [%s] (%s%s)",
3995 message_id, host->name, host->address, addrlist->address,
3996 addrlist->next ? ", ..." : "");
3997
3998 /* This is not for real; don't do the delivery. If there are
3999 any remaining hosts, list them. */
4000
4001 if (dont_deliver)
4002 {
4003 host_item *host2;
4004 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4005 for (addr = addrlist; addr; addr = addr->next)
4006 {
4007 addr->host_used = host;
4008 addr->special_action = '*';
4009 addr->message = US"delivery bypassed by -N option";
4010 }
4011 DEBUG(D_transport)
4012 {
4013 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4014 "*** host and remaining hosts:\n", tblock->name);
4015 for (host2 = host; host2; host2 = host2->next)
4016 debug_printf(" %s [%s]\n", host2->name,
4017 host2->address ? host2->address : US"unset");
4018 }
4019 rc = OK;
4020 }
4021
4022 /* This is for real. If the host is expired, we don't count it for
4023 hosts_max_retry. This ensures that all hosts must expire before an address
4024 is timed out, unless hosts_max_try_hardlimit (which protects against
4025 lunatic DNS configurations) is reached.
4026
4027 If the host is not expired and we are about to hit the hosts_max_retry
4028 limit, check to see if there is a subsequent hosts with a different MX
4029 value. If so, make that the next host, and don't count this one. This is a
4030 heuristic to make sure that different MXs do get tried. With a normal kind
4031 of retry rule, they would get tried anyway when the earlier hosts were
4032 delayed, but if the domain has a "retry every time" type of rule - as is
4033 often used for the the very large ISPs, that won't happen. */
4034
4035 else
4036 {
4037 host_item * thost;
4038 /* Make a copy of the host if it is local to this invocation
4039 of the transport. */
4040
4041 if (expanded_hosts)
4042 {
4043 thost = store_get(sizeof(host_item));
4044 *thost = *host;
4045 thost->name = string_copy(host->name);
4046 thost->address = string_copy(host->address);
4047 }
4048 else
4049 thost = host;
4050
4051 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4052 {
4053 host_item *h;
4054 DEBUG(D_transport)
4055 debug_printf("hosts_max_try limit reached with this host\n");
4056 for (h = host; h; h = h->next) if (h->mx != host->mx)
4057 {
4058 nexthost = h;
4059 unexpired_hosts_tried--;
4060 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4061 "and will be tried\n");
4062 break;
4063 }
4064 }
4065
4066 /* Attempt the delivery. */
4067
4068 total_hosts_tried++;
4069 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4070 &message_defer, FALSE);
4071
4072 /* Yield is one of:
4073 OK => connection made, each address contains its result;
4074 message_defer is set for message-specific defers (when all
4075 recipients are marked defer)
4076 DEFER => there was a non-message-specific delivery problem;
4077 ERROR => there was a problem setting up the arguments for a filter,
4078 or there was a problem with expanding added headers
4079 */
4080
4081 /* If the result is not OK, there was a non-message-specific problem.
4082 If the result is DEFER, we need to write to the logs saying what happened
4083 for this particular host, except in the case of authentication and TLS
4084 failures, where the log has already been written. If all hosts defer a
4085 general message is written at the end. */
4086
4087 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4088 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4089 write_logs(first_addr, host);
4090
4091 #ifndef DISABLE_EVENT
4092 if (rc == DEFER)
4093 deferred_event_raise(first_addr, host);
4094 #endif
4095
4096 /* If STARTTLS was accepted, but there was a failure in setting up the
4097 TLS session (usually a certificate screwup), and the host is not in
4098 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4099 TLS forcibly turned off. We have to start from scratch with a new SMTP
4100 connection. That's why the retry is done from here, not from within
4101 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4102 session, so the in-clear transmission after those errors, if permitted,
4103 happens inside smtp_deliver().] */
4104
4105 #ifdef SUPPORT_TLS
4106 if ( rc == DEFER
4107 && first_addr->basic_errno == ERRNO_TLSFAILURE
4108 && ob->tls_tempfail_tryclear
4109 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4110 )
4111 {
4112 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4113 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4114 first_addr = prepare_addresses(addrlist, host);
4115 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4116 &message_defer, TRUE);
4117 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4118 write_logs(first_addr, host);
4119 # ifndef DISABLE_EVENT
4120 if (rc == DEFER)
4121 deferred_event_raise(first_addr, host);
4122 # endif
4123 }
4124 #endif /*SUPPORT_TLS*/
4125 }
4126
4127 /* Delivery attempt finished */
4128
4129 rs = rc == OK ? US"OK"
4130 : rc == DEFER ? US"DEFER"
4131 : rc == ERROR ? US"ERROR"
4132 : US"?";
4133
4134 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4135 message_id, host->name, host->address, addrlist->address,
4136 addrlist->next ? " (& others)" : "", rs);
4137
4138 /* Release serialization if set up */
4139
4140 if (serialize_key) enq_end(serialize_key);
4141
4142 /* If the result is DEFER, or if a host retry record is known to exist, we
4143 need to add an item to the retry chain for updating the retry database
4144 at the end of delivery. We only need to add the item to the top address,
4145 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4146 for any other delivery attempts using the same address. (It is copied into
4147 the unusable tree at the outer level, so even if different address blocks
4148 contain the same address, it still won't get tried again.) */
4149
4150 if (rc == DEFER || retry_host_key)
4151 {
4152 int delete_flag = rc != DEFER ? rf_delete : 0;
4153 if (!retry_host_key)
4154 {
4155 BOOL incl_ip;
4156 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4157 US"retry_include_ip_address", ob->retry_include_ip_address,
4158 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4159 incl_ip = TRUE; /* error; use most-specific retry record */
4160
4161 retry_host_key = incl_ip
4162 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4163 : string_sprintf("T:%S%s", host->name, pistring);
4164 }
4165
4166 /* If a delivery of another message over an existing SMTP connection
4167 yields DEFER, we do NOT set up retry data for the host. This covers the
4168 case when there are delays in routing the addresses in the second message
4169 that are so long that the server times out. This is alleviated by not
4170 routing addresses that previously had routing defers when handling an
4171 existing connection, but even so, this case may occur (e.g. if a
4172 previously happily routed address starts giving routing defers). If the
4173 host is genuinely down, another non-continued message delivery will
4174 notice it soon enough. */
4175
4176 if (delete_flag != 0 || !continue_hostname)
4177 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4178
4179 /* We may have tried an expired host, if its retry time has come; ensure
4180 the status reflects the expiry for the benefit of any other addresses. */
4181
4182 if (rc == DEFER)
4183 {
4184 host->status = host_is_expired
4185 ? hstatus_unusable_expired : hstatus_unusable;
4186 host->why = hwhy_deferred;
4187 }
4188 }
4189
4190 /* If message_defer is set (host was OK, but every recipient got deferred
4191 because of some message-specific problem), or if that had happened
4192 previously so that a message retry key exists, add an appropriate item
4193 to the retry chain. Note that if there was a message defer but now there is
4194 a host defer, the message defer record gets deleted. That seems perfectly
4195 reasonable. Also, stop the message from being remembered as waiting
4196 for specific hosts. */
4197
4198 if (message_defer || retry_message_key)
4199 {
4200 int delete_flag = message_defer ? 0 : rf_delete;
4201 if (!retry_message_key)
4202 {
4203 BOOL incl_ip;
4204 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4205 US"retry_include_ip_address", ob->retry_include_ip_address,
4206 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4207 incl_ip = TRUE; /* error; use most-specific retry record */
4208
4209 retry_message_key = incl_ip
4210 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4211 message_id)
4212 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4213 }
4214 retry_add_item(addrlist, retry_message_key,
4215 rf_message | rf_host | delete_flag);
4216 update_waiting = FALSE;
4217 }
4218
4219 /* Any return other than DEFER (that is, OK or ERROR) means that the
4220 addresses have got their final statuses filled in for this host. In the OK
4221 case, see if any of them are deferred. */
4222
4223 if (rc == OK)
4224 for (addr = addrlist; addr; addr = addr->next)
4225 if (addr->transport_return == DEFER)
4226 {
4227 some_deferred = TRUE;
4228 break;
4229 }
4230
4231 /* If no addresses deferred or the result was ERROR, return. We do this for
4232 ERROR because a failing filter set-up or add_headers expansion is likely to
4233 fail for any host we try. */
4234
4235 if (rc == ERROR || (rc == OK && !some_deferred))
4236 {
4237 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4238 return TRUE; /* Each address has its status */
4239 }
4240
4241 /* If the result was DEFER or some individual addresses deferred, let
4242 the loop run to try other hosts with the deferred addresses, except for the
4243 case when we were trying to deliver down an existing channel and failed.
4244 Don't try any other hosts in this case. */
4245
4246 if (continue_hostname) break;
4247
4248 /* If the whole delivery, or some individual addresses, were deferred and
4249 there are more hosts that could be tried, do not count this host towards
4250 the hosts_max_try limit if the age of the message is greater than the
4251 maximum retry time for this host. This means we may try try all hosts,
4252 ignoring the limit, when messages have been around for some time. This is
4253 important because if we don't try all hosts, the address will never time
4254 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4255
4256 if ((rc == DEFER || some_deferred) && nexthost)
4257 {
4258 BOOL timedout;
4259 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4260
4261 if (retry && retry->rules)
4262 {
4263 retry_rule *last_rule;
4264 for (last_rule = retry->rules;
4265 last_rule->next;
4266 last_rule = last_rule->next);
4267 timedout = time(NULL) - received_time > last_rule->timeout;
4268 }
4269 else timedout = TRUE; /* No rule => timed out */
4270
4271 if (timedout)
4272 {
4273 unexpired_hosts_tried--;
4274 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4275 "hosts_max_try (message older than host's retry time)\n");
4276 }
4277 }
4278 } /* End of loop for trying multiple hosts. */
4279
4280 /* This is the end of the loop that repeats iff expired is TRUE and
4281 ob->delay_after_cutoff is FALSE. The second time round we will
4282 try those hosts that haven't been tried since the message arrived. */
4283
4284 DEBUG(D_transport)
4285 {
4286 debug_printf("all IP addresses skipped or deferred at least one address\n");
4287 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4288 debug_printf("retrying IP addresses not tried since message arrived\n");
4289 }
4290 }
4291
4292
4293 /* Get here if all IP addresses are skipped or defer at least one address. In
4294 MUA wrapper mode, this will happen only for connection or other non-message-
4295 specific failures. Force the delivery status for all addresses to FAIL. */
4296
4297 if (mua_wrapper)
4298 {
4299 for (addr = addrlist; addr; addr = addr->next)
4300 addr->transport_return = FAIL;
4301 goto END_TRANSPORT;
4302 }
4303
4304 /* In the normal, non-wrapper case, add a standard message to each deferred
4305 address if there hasn't been an error, that is, if it hasn't actually been
4306 tried this time. The variable "expired" will be FALSE if any deliveries were
4307 actually tried, or if there was at least one host that was not expired. That
4308 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4309 a delivery has been tried, an error code will be set, and the failing of the
4310 message is handled by the retry code later.
4311
4312 If queue_smtp is set, or this transport was called to send a subsequent message
4313 down an existing TCP/IP connection, and something caused the host not to be
4314 found, we end up here, but can detect these cases and handle them specially. */
4315
4316 for (addr = addrlist; addr; addr = addr->next)
4317 {
4318 /* If host is not NULL, it means that we stopped processing the host list
4319 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4320 means we need to behave as if some hosts were skipped because their retry
4321 time had not come. Specifically, this prevents the address from timing out.
4322 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4323 hosts were tried. */
4324
4325 if (host)
4326 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4327 {
4328 DEBUG(D_transport)
4329 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4330 "hosts were tried\n");
4331 }
4332 else
4333 {
4334 DEBUG(D_transport)
4335 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4336 setflag(addr, af_retry_skipped);
4337 }
4338
4339 if (queue_smtp) /* no deliveries attempted */
4340 {
4341 addr->transport_return = DEFER;
4342 addr->basic_errno = 0;
4343 addr->message = US"SMTP delivery explicitly queued";
4344 }
4345
4346 else if ( addr->transport_return == DEFER
4347 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4348 && !addr->message
4349 )
4350 {
4351 addr->basic_errno = ERRNO_HRETRY;
4352 if (continue_hostname)
4353 addr->message = US"no host found for existing SMTP connection";
4354 else if (expired)
4355 {
4356 setflag(addr, af_pass_message); /* This is not a security risk */
4357 addr->message = string_sprintf(
4358 "all hosts%s have been failing for a long time %s",
4359 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4360 ob->delay_after_cutoff
4361 ? US"(and retry time not reached)"
4362 : US"and were last tried after this message arrived");
4363
4364 /* If we are already using fallback hosts, or there are no fallback hosts
4365 defined, convert the result to FAIL to cause a bounce. */
4366
4367 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4368 addr->transport_return = FAIL;
4369 }
4370 else
4371 {
4372 const char * s;
4373 if (hosts_retry == hosts_total)
4374 s = "retry time not reached for any host%s";
4375 else if (hosts_fail == hosts_total)
4376 s = "all host address lookups%s failed permanently";
4377 else if (hosts_defer == hosts_total)
4378 s = "all host address lookups%s failed temporarily";
4379 else if (hosts_serial == hosts_total)
4380 s = "connection limit reached for all hosts%s";
4381 else if (hosts_fail+hosts_defer == hosts_total)
4382 s = "all host address lookups%s failed";
4383 else
4384 s = "some host address lookups failed and retry time "
4385 "not reached for other hosts or connection limit reached%s";
4386
4387 addr->message = string_sprintf(s,
4388 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4389 }
4390 }
4391 }
4392
4393 /* Update the database which keeps information about which messages are waiting
4394 for which hosts to become available. For some message-specific errors, the
4395 update_waiting flag is turned off because we don't want follow-on deliveries in
4396 those cases. If this transport instance is explicitly limited to one message
4397 per connection then follow-on deliveries are not possible and there's no need
4398 to create/update the per-transport wait-<transport_name> database. */
4399
4400 if (update_waiting && tblock->connection_max_messages != 1)
4401 transport_update_waiting(hostlist, tblock->name);
4402
4403 END_TRANSPORT:
4404
4405 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4406
4407 return TRUE; /* Each address has its status */
4408 }
4409
4410 /* vi: aw ai sw=2
4411 */
4412 /* End of transport/smtp.c */
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