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