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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 #endif
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
95 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
98 #endif
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
101 #ifdef SUPPORT_TLS
102 # ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
105 # endif
106 # ifndef DISABLE_OCSP
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
109 # endif
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
112 #endif
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
117 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
120 #endif
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
123 #ifndef DISABLE_PRDR
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 #endif
127 #ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130 #endif
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
151 #ifdef SUPPORT_SOCKS
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154 #endif
155 #ifdef SUPPORT_TLS
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
178 #endif
179 };
180
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
183
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187 /* Default private options block for the smtp transport. */
188
189 smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
199 NULL, /* DSCP */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 US"*", /* hosts_try_chunking */
204 #ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
206 NULL, /* hosts_require_dane */
207 #endif
208 NULL, /* hosts_try_fastopen */
209 #ifndef DISABLE_PRDR
210 US"*", /* hosts_try_prdr */
211 #endif
212 #ifndef DISABLE_OCSP
213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
214 NULL, /* hosts_require_ocsp */
215 #endif
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
218 NULL, /* hosts_verify_avoid_tls */
219 NULL, /* hosts_avoid_pipelining */
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
228 50, /* hosts_max_try_hardlimit */
229 TRUE, /* address_retry_include_sender */
230 FALSE, /* allow_localhost */
231 FALSE, /* authenticated_sender_force */
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
235 { NULL, NULL }, /* dnssec_domains {request,require} */
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
240 FALSE, /* lmtp_ignore_quota */
241 NULL, /* expand_retry_include_ip_address */
242 TRUE /* retry_include_ip_address */
243 #ifdef SUPPORT_SOCKS
244 ,NULL /* socks_proxy */
245 #endif
246 #ifdef SUPPORT_TLS
247 ,NULL, /* tls_certificate */
248 NULL, /* tls_crl */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
251 NULL, /* tls_sni */
252 US"system", /* tls_verify_certificates */
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
257 US"*", /* tls_try_verify_hosts */
258 US"*" /* tls_verify_cert_hostnames */
259 #endif
260 #ifndef DISABLE_DKIM
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
268 #endif
269 };
270
271 /* some DSN flags for use later */
272
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
275
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
277
278
279
280 /* Local statics */
281
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285 static BOOL update_waiting; /* TRUE to update the "wait" database */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
287
288
289 /*************************************************
290 * Setup entry point *
291 *************************************************/
292
293 /* This function is called when the transport is about to be used,
294 but before running it in a sub-process. It is used for two things:
295
296 (1) To set the fallback host list in addresses, when delivering.
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
299
300 Arguments:
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
306 errmsg place for error message (not used)
307
308 Returns: OK always (FAIL, DEFER not used)
309 */
310
311 static int
312 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
314 {
315 smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
317
318 errmsg = errmsg; /* Keep picky compilers happy */
319 uid = uid;
320 gid = gid;
321
322 /* Pass back options if required. This interface is getting very messy. */
323
324 if (tf)
325 {
326 tf->interface = ob->interface;
327 tf->port = ob->port;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
335 tf->helo_data = ob->helo_data;
336 }
337
338 /* Set the fallback host list for all the addresses that don't have fallback
339 host lists, provided that the local host wasn't present in the original host
340 list. */
341
342 if (!testflag(addrlist, af_local_host_removed))
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
345
346 return OK;
347 }
348
349
350
351 /*************************************************
352 * Initialization entry point *
353 *************************************************/
354
355 /* Called for each instance, after its options have been read, to
356 enable consistency checks to be done, or anything else that needs
357 to be set up.
358
359 Argument: pointer to the transport instance block
360 Returns: nothing
361 */
362
363 void
364 smtp_transport_init(transport_instance *tblock)
365 {
366 smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
368
369 /* Retry_use_local_part defaults FALSE if unset */
370
371 if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
373
374 /* Set the default port according to the protocol */
375
376 if (ob->port == NULL)
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
379
380 /* Set up the setup entry point, to be called before subprocesses for this
381 transport. */
382
383 tblock->setup = smtp_transport_setup;
384
385 /* Complain if any of the timeouts are zero. */
386
387 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
391 tblock->name);
392
393 /* If hosts_override is set and there are local hosts, set the global
394 flag that stops verify from showing router hosts. */
395
396 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
397
398 /* If there are any fallback hosts listed, build a chain of host items
399 for them, but do not do any lookups at this time. */
400
401 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
402 }
403
404
405
406
407
408 /*************************************************
409 * Set delivery info into all active addresses *
410 *************************************************/
411
412 /* Only addresses whose status is >= PENDING are relevant. A lesser
413 status means that an address is not currently being processed.
414
415 Arguments:
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
421 host if set, mark addrs as having used this host
422 smtp_greeting from peer
423 helo_response from peer
424
425 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
426 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
427 this particular type of timeout.
428
429 Returns: nothing
430 */
431
432 static void
433 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
434 BOOL pass_message, host_item * host
435 #ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
437 #endif
438 )
439 {
440 address_item *addr;
441 int orvalue = 0;
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
443 {
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
446 }
447 for (addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
449 {
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
452 if (msg)
453 {
454 addr->message = msg;
455 if (pass_message) setflag(addr, af_pass_message);
456 }
457 addr->transport_return = rc;
458 if (host)
459 {
460 addr->host_used = host;
461 #ifdef EXPERIMENTAL_DSN_INFO
462 if (smtp_greeting)
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
465
466 if (helo_response)
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
469 #endif
470 }
471 }
472 }
473
474 static void
475 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
476 BOOL pass_message)
477 {
478 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , NULL, NULL
481 #endif
482 );
483 }
484
485
486 /*************************************************
487 * Check an SMTP response *
488 *************************************************/
489
490 /* This function is given an errno code and the SMTP response buffer
491 to analyse, together with the host identification for generating messages. It
492 sets an appropriate message and puts the first digit of the response code into
493 the yield variable. If no response was actually read, a suitable digit is
494 chosen.
495
496 Arguments:
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
502 message where to put an error message
503 pass_message set TRUE if message is an SMTP response
504
505 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
506 */
507
508 static BOOL
509 check_response(host_item *host, int *errno_value, int more_errno,
510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
511 {
512 uschar * pl = pipelining_active ? US"pipelined " : US"";
513 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 goto RESPONSE_FAILED;
1862 }
1863 }
1864
1865 /* STARTTLS accepted: try to negotiate a TLS session. */
1866
1867 else
1868 TLS_NEGOTIATE:
1869 {
1870 address_item * addr;
1871 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1872 # ifdef EXPERIMENTAL_DANE
1873 , sx->dane ? &tlsa_dnsa : NULL
1874 # endif
1875 );
1876
1877 /* TLS negotiation failed; give an error. From outside, this function may
1878 be called again to try in clear on a new connection, if the options permit
1879 it for this host. */
1880
1881 if (rc != OK)
1882 {
1883 # ifdef EXPERIMENTAL_DANE
1884 if (sx->dane) log_write(0, LOG_MAIN,
1885 "DANE attempt failed; no TLS connection to %s [%s]",
1886 sx->host->name, sx->host->address);
1887 # endif
1888
1889 save_errno = ERRNO_TLSFAILURE;
1890 message = US"failure while setting up TLS session";
1891 sx->send_quit = FALSE;
1892 goto TLS_FAILED;
1893 }
1894
1895 /* TLS session is set up */
1896
1897 smtp_peer_options_wrap = smtp_peer_options;
1898 for (addr = sx->addrlist; addr; addr = addr->next)
1899 if (addr->transport_return == PENDING_DEFER)
1900 {
1901 addr->cipher = tls_out.cipher;
1902 addr->ourcert = tls_out.ourcert;
1903 addr->peercert = tls_out.peercert;
1904 addr->peerdn = tls_out.peerdn;
1905 addr->ocsp = tls_out.ocsp;
1906 }
1907 }
1908 }
1909
1910 /* if smtps, we'll have smtp_command set to something else; always safe to
1911 reset it here. */
1912 smtp_command = big_buffer;
1913
1914 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1915 helo_data is null, we are dealing with a connection that was passed from
1916 another process, and so we won't have expanded helo_data above. We have to
1917 expand it here. $sending_ip_address and $sending_port are set up right at the
1918 start of the Exim process (in exim.c). */
1919
1920 if (tls_out.active >= 0)
1921 {
1922 char *greeting_cmd;
1923 BOOL good_response;
1924
1925 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1926 {
1927 uschar *message = string_sprintf("failed to expand helo_data: %s",
1928 expand_string_message);
1929 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1930 yield = DEFER;
1931 goto SEND_QUIT;
1932 }
1933
1934 /* For SMTPS we need to wait for the initial OK response. */
1935 if (sx->smtps)
1936 {
1937 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1938 '2', sx->ob->command_timeout);
1939 #ifdef EXPERIMENTAL_DSN_INFO
1940 sx->smtp_greeting = string_copy(sx->buffer);
1941 #endif
1942 if (!good_response) goto RESPONSE_FAILED;
1943 }
1944
1945 if (sx->esmtp)
1946 greeting_cmd = "EHLO";
1947 else
1948 {
1949 greeting_cmd = "HELO";
1950 DEBUG(D_transport)
1951 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1952 }
1953
1954 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1955 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1956 goto SEND_FAILED;
1957 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1958 '2', sx->ob->command_timeout);
1959 #ifdef EXPERIMENTAL_DSN_INFO
1960 sx->helo_response = string_copy(sx->buffer);
1961 #endif
1962 if (!good_response) goto RESPONSE_FAILED;
1963 smtp_peer_options = 0;
1964 }
1965
1966 /* If the host is required to use a secure channel, ensure that we
1967 have one. */
1968
1969 else if ( sx->smtps
1970 # ifdef EXPERIMENTAL_DANE
1971 || sx->dane
1972 # endif
1973 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
1974 )
1975 {
1976 save_errno = ERRNO_TLSREQUIRED;
1977 message = string_sprintf("a TLS session is required, but %s",
1978 smtp_peer_options & PEER_OFFERED_TLS
1979 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
1980 goto TLS_FAILED;
1981 }
1982 #endif /*SUPPORT_TLS*/
1983
1984 /* If TLS is active, we have just started it up and re-done the EHLO command,
1985 so its response needs to be analyzed. If TLS is not active and this is a
1986 continued session down a previously-used socket, we haven't just done EHLO, so
1987 we skip this. */
1988
1989 if (continue_hostname == NULL
1990 #ifdef SUPPORT_TLS
1991 || tls_out.active >= 0
1992 #endif
1993 )
1994 {
1995 if (sx->esmtp || sx->lmtp)
1996 {
1997 sx->peer_offered = ehlo_response(sx->buffer,
1998 0 /* no TLS */
1999 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2000 | PEER_OFFERED_CHUNKING
2001 | PEER_OFFERED_PRDR
2002 #ifdef SUPPORT_I18N
2003 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2004 /*XXX if we hand peercaps on to continued-conn processes,
2005 must not depend on this addr */
2006 #endif
2007 | PEER_OFFERED_DSN
2008 | PEER_OFFERED_PIPE
2009 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2010 );
2011
2012 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2013 lmtp_ignore_quota option was set. */
2014
2015 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2016
2017 /* If the response to EHLO specified support for the SIZE parameter, note
2018 this, provided size_addition is non-negative. */
2019
2020 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2021
2022 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2023 the current host, esmtp will be false, so PIPELINING can never be used. If
2024 the current host matches hosts_avoid_pipelining, don't do it. */
2025
2026 if ( sx->peer_offered & PEER_OFFERED_PIPE
2027 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2028 smtp_peer_options |= PEER_OFFERED_PIPE;
2029
2030 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2031 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2032
2033 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2034 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2035 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2036
2037 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2038 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2039
2040 #ifndef DISABLE_PRDR
2041 if ( sx->peer_offered & PEER_OFFERED_PRDR
2042 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2043 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2044
2045 if (sx->peer_offered & PEER_OFFERED_PRDR)
2046 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2047 #endif
2048
2049 /* Note if the server supports DSN */
2050 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2051 DEBUG(D_transport) debug_printf("%susing DSN\n",
2052 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2053
2054 /* Note if the response to EHLO specifies support for the AUTH extension.
2055 If it has, check that this host is one we want to authenticate to, and do
2056 the business. The host name and address must be available when the
2057 authenticator's client driver is running. */
2058
2059 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2060 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2061 {
2062 default: goto SEND_QUIT;
2063 case OK: break;
2064 case FAIL_SEND: goto SEND_FAILED;
2065 case FAIL: goto RESPONSE_FAILED;
2066 }
2067 }
2068 }
2069 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2070
2071 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2072 message-specific. */
2073
2074 sx->setting_up = FALSE;
2075
2076 #ifdef SUPPORT_I18N
2077 if (sx->addrlist->prop.utf8_msg)
2078 {
2079 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2080 && !sx->addrlist->prop.utf8_downcvt_maybe;
2081 DEBUG(D_transport) if (!sx->utf8_needed)
2082 debug_printf("utf8: %s downconvert\n",
2083 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2084 }
2085
2086 /* If this is an international message we need the host to speak SMTPUTF8 */
2087 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2088 {
2089 errno = ERRNO_UTF8_FWD;
2090 goto RESPONSE_FAILED;
2091 }
2092 #endif
2093
2094 return OK;
2095
2096
2097 {
2098 int code;
2099 uschar * set_message;
2100
2101 RESPONSE_FAILED:
2102 {
2103 save_errno = errno;
2104 message = NULL;
2105 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2106 sx->buffer, &code, &message, &pass_message);
2107 goto FAILED;
2108 }
2109
2110 SEND_FAILED:
2111 {
2112 save_errno = errno;
2113 code = '4';
2114 message = US string_sprintf("send() to %s [%s] failed: %s",
2115 sx->host->name, sx->host->address, strerror(save_errno));
2116 sx->send_quit = FALSE;
2117 goto FAILED;
2118 }
2119
2120 /* This label is jumped to directly when a TLS negotiation has failed,
2121 or was not done for a host for which it is required. Values will be set
2122 in message and save_errno, and setting_up will always be true. Treat as
2123 a temporary error. */
2124
2125 #ifdef SUPPORT_TLS
2126 TLS_FAILED:
2127 code = '4';
2128 #endif
2129
2130 /* The failure happened while setting up the call; see if the failure was
2131 a 5xx response (this will either be on connection, or following HELO - a 5xx
2132 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2133 never going to accept them. For other errors during setting up (timeouts or
2134 whatever), defer all addresses, and yield DEFER, so that the host is not
2135 tried again for a while. */
2136
2137 FAILED:
2138 sx->ok = FALSE; /* For when reached by GOTO */
2139 set_message = message;
2140
2141 yield = code == '5'
2142 #ifdef SUPPORT_I18N
2143 || errno == ERRNO_UTF8_FWD
2144 #endif
2145 ? FAIL : DEFER;
2146
2147 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2148 #ifdef EXPERIMENTAL_DSN_INFO
2149 , sx->smtp_greeting, sx->helo_response
2150 #endif
2151 );
2152 }
2153
2154
2155 SEND_QUIT:
2156
2157 if (sx->send_quit)
2158 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2159
2160 #ifdef SUPPORT_TLS
2161 tls_close(FALSE, TRUE);
2162 #endif
2163
2164 /* Close the socket, and return the appropriate value, first setting
2165 works because the NULL setting is passed back to the calling process, and
2166 remote_max_parallel is forced to 1 when delivering over an existing connection,
2167
2168 If all went well and continue_more is set, we shouldn't actually get here if
2169 there are further addresses, as the return above will be taken. However,
2170 writing RSET might have failed, or there may be other addresses whose hosts are
2171 specified in the transports, and therefore not visible at top level, in which
2172 case continue_more won't get set. */
2173
2174 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2175 if (sx->send_quit)
2176 {
2177 shutdown(sx->outblock.sock, SHUT_WR);
2178 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2179 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2180 rc--; /* drain socket */
2181 sx->send_quit = FALSE;
2182 }
2183 (void)close(sx->inblock.sock);
2184 sx->inblock.sock = sx->outblock.sock = -1;
2185
2186 #ifndef DISABLE_EVENT
2187 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2188 #endif
2189
2190 continue_transport = NULL;
2191 continue_hostname = NULL;
2192 return yield;
2193 }
2194
2195
2196
2197
2198 /* Create the string of options that will be appended to the MAIL FROM:
2199 in the connection context buffer */
2200
2201 static int
2202 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2203 {
2204 uschar * p = sx->buffer;
2205 address_item * addr;
2206 int address_count;
2207
2208 *p = 0;
2209
2210 /* If we know the receiving MTA supports the SIZE qualification,
2211 send it, adding something to the message size to allow for imprecision
2212 and things that get added en route. Exim keeps the number of lines
2213 in a message, so we can give an accurate value for the original message, but we
2214 need some additional to handle added headers. (Double "." characters don't get
2215 included in the count.) */
2216
2217 if (sx->peer_offered & PEER_OFFERED_SIZE)
2218 {
2219 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2220 while (*p) p++;
2221 }
2222
2223 #ifndef DISABLE_PRDR
2224 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2225 request that */
2226
2227 sx->prdr_active = FALSE;
2228 if (sx->peer_offered & PEER_OFFERED_PRDR)
2229 for (addr = addrlist; addr; addr = addr->next)
2230 if (addr->transport_return == PENDING_DEFER)
2231 {
2232 for (addr = addr->next; addr; addr = addr->next)
2233 if (addr->transport_return == PENDING_DEFER)
2234 { /* at least two recipients to send */
2235 sx->prdr_active = TRUE;
2236 sprintf(CS p, " PRDR"); p += 5;
2237 break;
2238 }
2239 break;
2240 }
2241 #endif
2242
2243 #ifdef SUPPORT_I18N
2244 /* If it supports internationalised messages, and this meesage need that,
2245 request it */
2246
2247 if ( sx->peer_offered & PEER_OFFERED_UTF8
2248 && addrlist->prop.utf8_msg
2249 && !addrlist->prop.utf8_downcvt
2250 )
2251 Ustrcpy(p, " SMTPUTF8"), p += 9;
2252 #endif
2253
2254 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2255 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2256 addr && address_count < sx->max_rcpt;
2257 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2258 {
2259 address_count++;
2260 if (!(addr->dsn_flags & rf_dsnlasthop))
2261 {
2262 sx->dsn_all_lasthop = FALSE;
2263 break;
2264 }
2265 }
2266
2267 /* Add any DSN flags to the mail command */
2268
2269 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2270 {
2271 if (dsn_ret == dsn_ret_hdrs)
2272 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2273 else if (dsn_ret == dsn_ret_full)
2274 { Ustrcpy(p, " RET=FULL"); p += 9; }
2275
2276 if (dsn_envid)
2277 {
2278 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2279 while (*p) p++;
2280 }
2281 }
2282
2283 /* If an authenticated_sender override has been specified for this transport
2284 instance, expand it. If the expansion is forced to fail, and there was already
2285 an authenticated_sender for this message, the original value will be used.
2286 Other expansion failures are serious. An empty result is ignored, but there is
2287 otherwise no check - this feature is expected to be used with LMTP and other
2288 cases where non-standard addresses (e.g. without domains) might be required. */
2289
2290 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2291 return ERROR;
2292
2293 return OK;
2294 }
2295
2296
2297 static void
2298 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2299 {
2300 uschar * p = sx->buffer;
2301 *p = 0;
2302
2303 /* Add any DSN flags to the rcpt command */
2304
2305 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2306 {
2307 if (addr->dsn_flags & rf_dsnflags)
2308 {
2309 int i;
2310 BOOL first = TRUE;
2311
2312 Ustrcpy(p, " NOTIFY=");
2313 while (*p) p++;
2314 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2315 {
2316 if (!first) *p++ = ',';
2317 first = FALSE;
2318 Ustrcpy(p, rf_names[i]);
2319 while (*p) p++;
2320 }
2321 }
2322
2323 if (addr->dsn_orcpt)
2324 {
2325 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2326 addr->dsn_orcpt);
2327 while (*p) p++;
2328 }
2329 }
2330 }
2331
2332
2333
2334 /*
2335 Return:
2336 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2337 -1 MAIL response error
2338 -2 any non-MAIL read i/o error
2339 -3 non-MAIL response timeout
2340 -4 internal error; channel still usable
2341 -5 transmit failed
2342 */
2343
2344 int
2345 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2346 {
2347 address_item * addr;
2348 int address_count;
2349 int rc;
2350
2351 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2352 {
2353 *yield = ERROR;
2354 return -4;
2355 }
2356
2357 /* From here until we send the DATA command, we can make use of PIPELINING
2358 if the server host supports it. The code has to be able to check the responses
2359 at any point, for when the buffer fills up, so we write it totally generally.
2360 When PIPELINING is off, each command written reports that it has flushed the
2361 buffer. */
2362
2363 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2364
2365 {
2366 uschar * s = sx->from_addr;
2367 #ifdef SUPPORT_I18N
2368 uschar * errstr = NULL;
2369
2370 /* If we must downconvert, do the from-address here. Remember we had to
2371 for the to-addresses (done below), and also (ugly) for re-doing when building
2372 the delivery log line. */
2373
2374 if ( sx->addrlist->prop.utf8_msg
2375 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2376 )
2377 {
2378 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2379 {
2380 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2381 *yield = ERROR;
2382 return -4;
2383 }
2384 setflag(sx->addrlist, af_utf8_downcvt);
2385 }
2386 #endif
2387
2388 rc = smtp_write_command(&sx->outblock, pipelining_active,
2389 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2390 }
2391
2392 mail_command = string_copy(big_buffer); /* Save for later error message */
2393
2394 switch(rc)
2395 {
2396 case -1: /* Transmission error */
2397 return -5;
2398
2399 case +1: /* Cmd was sent */
2400 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2401 sx->ob->command_timeout))
2402 {
2403 if (errno == 0 && sx->buffer[0] == '4')
2404 {
2405 errno = ERRNO_MAIL4XX;
2406 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2407 }
2408 return -1;
2409 }
2410 sx->pending_MAIL = FALSE;
2411 break;
2412
2413 /* otherwise zero: command queued for pipeline */
2414 }
2415
2416 /* Pass over all the relevant recipient addresses for this host, which are the
2417 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2418 several before we have to read the responses for those seen so far. This
2419 checking is done by a subroutine because it also needs to be done at the end.
2420 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2421 the next one if not all are sent.
2422
2423 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2424 last address because we want to abort if any recipients have any kind of
2425 problem, temporary or permanent. We know that all recipient addresses will have
2426 the PENDING_DEFER status, because only one attempt is ever made, and we know
2427 that max_rcpt will be large, so all addresses will be done at once.
2428
2429 For verify we flush the pipeline after any (the only) rcpt address. */
2430
2431 for (addr = sx->first_addr, address_count = 0;
2432 addr && address_count < sx->max_rcpt;
2433 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2434 {
2435 int count;
2436 BOOL no_flush;
2437 uschar * rcpt_addr;
2438
2439 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2440 ? dsn_support_yes : dsn_support_no;
2441
2442 address_count++;
2443 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
2444
2445 build_rcptcmd_options(sx, addr);
2446
2447 /* Now send the RCPT command, and process outstanding responses when
2448 necessary. After a timeout on RCPT, we just end the function, leaving the
2449 yield as OK, because this error can often mean that there is a problem with
2450 just one address, so we don't want to delay the host. */
2451
2452 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2453
2454 #ifdef SUPPORT_I18N
2455 if ( testflag(sx->addrlist, af_utf8_downcvt)
2456 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2457 )
2458 {
2459 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2460 errno = ERRNO_EXPANDFAIL;
2461 return -5; /*XXX too harsh? */
2462 }
2463 #endif
2464
2465 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2466 rcpt_addr, sx->igquotstr, sx->buffer);
2467
2468 if (count < 0) return -5;
2469 if (count > 0)
2470 {
2471 switch(sync_responses(sx, count, 0))
2472 {
2473 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2474 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2475 break;
2476
2477 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2478 if (!sx->lmtp) /* can't tell about progress yet */
2479 sx->completed_addr = TRUE;
2480 case 0: /* No 2xx or 5xx, but no probs */
2481 break;
2482
2483 case -1: return -3; /* Timeout on RCPT */
2484 case -2: return -2; /* non-MAIL read i/o error */
2485 default: return -1; /* any MAIL error */
2486 }
2487 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2488 }
2489 } /* Loop for next address */
2490
2491 sx->next_addr = addr;
2492 return 0;
2493 }
2494
2495
2496 /*************************************************
2497 * Deliver address list to given host *
2498 *************************************************/
2499
2500 /* If continue_hostname is not null, we get here only when continuing to
2501 deliver down an existing channel. The channel was passed as the standard
2502 input. TLS is never active on a passed channel; the previous process always
2503 closes it down before passing the connection on.
2504
2505 Otherwise, we have to make a connection to the remote host, and do the
2506 initial protocol exchange.
2507
2508 When running as an MUA wrapper, if the sender or any recipient is rejected,
2509 temporarily or permanently, we force failure for all recipients.
2510
2511 Arguments:
2512 addrlist chain of potential addresses to deliver; only those whose
2513 transport_return field is set to PENDING_DEFER are currently
2514 being processed; others should be skipped - they have either
2515 been delivered to an earlier host or IP address, or been
2516 failed by one of them.
2517 host host to deliver to
2518 host_af AF_INET or AF_INET6
2519 port default TCP/IP port to use, in host byte order
2520 interface interface to bind to, or NULL
2521 tblock transport instance block
2522 message_defer set TRUE if yield is OK, but all addresses were deferred
2523 because of a non-recipient, non-host failure, that is, a
2524 4xx response to MAIL FROM, DATA, or ".". This is a defer
2525 that is specific to the message.
2526 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2527 a second attempt after TLS initialization fails
2528
2529 Returns: OK - the connection was made and the delivery attempted;
2530 the result for each address is in its data block.
2531 DEFER - the connection could not be made, or something failed
2532 while setting up the SMTP session, or there was a
2533 non-message-specific error, such as a timeout.
2534 ERROR - a filter command is specified for this transport,
2535 and there was a problem setting it up; OR helo_data
2536 or add_headers or authenticated_sender is specified
2537 for this transport, and the string failed to expand
2538 */
2539
2540 static int
2541 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2542 uschar *interface, transport_instance *tblock,
2543 BOOL *message_defer, BOOL suppress_tls)
2544 {
2545 address_item *addr;
2546 int yield = OK;
2547 int save_errno;
2548 int rc;
2549 time_t start_delivery_time = time(NULL);
2550
2551 BOOL pass_message = FALSE;
2552 uschar *message = NULL;
2553 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2554 uschar *p;
2555
2556 smtp_context sx;
2557
2558 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2559 *message_defer = FALSE;
2560
2561 sx.addrlist = addrlist;
2562 sx.host = host;
2563 sx.host_af = host_af,
2564 sx.port = port;
2565 sx.interface = interface;
2566 sx.helo_data = NULL;
2567 sx.tblock = tblock;
2568 sx.verify = FALSE;
2569
2570 /* Get the channel set up ready for a message (MAIL FROM being the next
2571 SMTP command to send */
2572
2573 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2574 return rc;
2575
2576 /* If there is a filter command specified for this transport, we can now
2577 set it up. This cannot be done until the identify of the host is known. */
2578
2579 if (tblock->filter_command)
2580 {
2581 BOOL rc;
2582 uschar fbuf[64];
2583 sprintf(CS fbuf, "%.50s transport", tblock->name);
2584 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2585 TRUE, DEFER, addrlist, fbuf, NULL);
2586 transport_filter_timeout = tblock->filter_timeout;
2587
2588 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2589 yield ERROR. */
2590
2591 if (!rc)
2592 {
2593 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2594 FALSE);
2595 yield = ERROR;
2596 goto SEND_QUIT;
2597 }
2598
2599 if ( transport_filter_argv
2600 && *transport_filter_argv
2601 && **transport_filter_argv
2602 && sx.peer_offered & PEER_OFFERED_CHUNKING
2603 )
2604 {
2605 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2606 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2607 }
2608 }
2609
2610
2611 /* For messages that have more than the maximum number of envelope recipients,
2612 we want to send several transactions down the same SMTP connection. (See
2613 comments in deliver.c as to how this reconciles, heuristically, with
2614 remote_max_parallel.) This optimization was added to Exim after the following
2615 code was already working. The simplest way to put it in without disturbing the
2616 code was to use a goto to jump back to this point when there is another
2617 transaction to handle. */
2618
2619 SEND_MESSAGE:
2620 sx.from_addr = return_path;
2621 sx.first_addr = sx.sync_addr = addrlist;
2622 sx.ok = FALSE;
2623 sx.send_rset = TRUE;
2624 sx.completed_addr = FALSE;
2625
2626
2627 /* Initiate a message transfer. */
2628
2629 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2630 {
2631 case 0: break;
2632 case -1: case -2: goto RESPONSE_FAILED;
2633 case -3: goto END_OFF;
2634 case -4: goto SEND_QUIT;
2635 default: goto SEND_FAILED;
2636 }
2637
2638 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2639 permanently or temporarily. We should have flushed and synced after the last
2640 RCPT. */
2641
2642 if (mua_wrapper)
2643 {
2644 address_item *badaddr;
2645 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2646 if (badaddr->transport_return != PENDING_OK)
2647 {
2648 /*XXX could we find a better errno than 0 here? */
2649 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2650 testflag(badaddr, af_pass_message));
2651 sx.ok = FALSE;
2652 break;
2653 }
2654 }
2655
2656 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2657 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2658 have a good recipient buffered up if we are pipelining. We don't want to waste
2659 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2660 are pipelining. The responses are all handled by sync_responses().
2661 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2662 to send is. */
2663
2664 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2665 && (sx.ok || (pipelining_active && !mua_wrapper)))
2666 {
2667 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2668
2669 if (count < 0) goto SEND_FAILED;
2670 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2671 {
2672 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2673 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2674 break;
2675
2676 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2677 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2678 case 0: break; /* No 2xx or 5xx, but no probs */
2679
2680 case -1: goto END_OFF; /* Timeout on RCPT */
2681 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2682 }
2683 pipelining_active = FALSE;
2684 data_command = string_copy(big_buffer); /* Save for later error message */
2685 }
2686
2687 /* If there were no good recipients (but otherwise there have been no
2688 problems), just set ok TRUE, since we have handled address-specific errors
2689 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2690 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2691 well as body. Set the appropriate timeout value to be used for each chunk.
2692 (Haven't been able to make it work using select() for writing yet.) */
2693
2694 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2695 {
2696 /* Save the first address of the next batch. */
2697 sx.first_addr = sx.next_addr;
2698
2699 sx.ok = TRUE;
2700 }
2701 else
2702 {
2703 transport_ctx tctx = {
2704 tblock,
2705 addrlist,
2706 US".", US"..", /* Escaping strings */
2707 topt_use_crlf | topt_escape_headers
2708 | (tblock->body_only ? topt_no_headers : 0)
2709 | (tblock->headers_only ? topt_no_body : 0)
2710 | (tblock->return_path_add ? topt_add_return_path : 0)
2711 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2712 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2713 };
2714
2715 /* If using CHUNKING we need a callback from the generic transport
2716 support to us, for the sending of BDAT smtp commands and the reaping
2717 of responses. The callback needs a whole bunch of state so set up
2718 a transport-context structure to be passed around. */
2719
2720 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2721 {
2722 tctx.check_string = tctx.escape_string = NULL;
2723 tctx.options |= topt_use_bdat;
2724 tctx.chunk_cb = smtp_chunk_cmd_callback;
2725 sx.pending_BDAT = FALSE;
2726 sx.good_RCPT = sx.ok;
2727 sx.cmd_count = 0;
2728 tctx.smtp_context = &sx;
2729 }
2730 else
2731 tctx.options |= topt_end_dot;
2732
2733 /* Save the first address of the next batch. */
2734 sx.first_addr = sx.next_addr;
2735
2736 /* Responses from CHUNKING commands go in buffer. Otherwise,
2737 there has not been a response. */
2738
2739 sx.buffer[0] = 0;
2740
2741 sigalrm_seen = FALSE;
2742 transport_write_timeout = sx.ob->data_timeout;
2743 smtp_command = US"sending data block"; /* For error messages */
2744 DEBUG(D_transport|D_v)
2745 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2746 debug_printf(" will write message using CHUNKING\n");
2747 else
2748 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2749 transport_count = 0;
2750
2751 #ifndef DISABLE_DKIM
2752 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2753 #else
2754 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2755 #endif
2756
2757 /* transport_write_message() uses write() because it is called from other
2758 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2759 it can exit with "Broken pipe" as its error. This really means that the
2760 socket got closed at the far end. */
2761
2762 transport_write_timeout = 0; /* for subsequent transports */
2763
2764 /* Failure can either be some kind of I/O disaster (including timeout),
2765 or the failure of a transport filter or the expansion of added headers.
2766 Or, when CHUNKING, it can be a protocol-detected failure. */
2767
2768 if (!sx.ok)
2769 goto RESPONSE_FAILED;
2770
2771 /* We used to send the terminating "." explicitly here, but because of
2772 buffering effects at both ends of TCP/IP connections, you don't gain
2773 anything by keeping it separate, so it might as well go in the final
2774 data buffer for efficiency. This is now done by setting the topt_end_dot
2775 flag above. */
2776
2777 smtp_command = US"end of data";
2778
2779 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2780 {
2781 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2782 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2783 {
2784 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2785 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2786 break;
2787
2788 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2789 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2790 case 0: break; /* No 2xx or 5xx, but no probs */
2791
2792 case -1: goto END_OFF; /* Timeout on RCPT */
2793 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2794 }
2795 }
2796
2797 #ifndef DISABLE_PRDR
2798 /* For PRDR we optionally get a partial-responses warning
2799 * followed by the individual responses, before going on with
2800 * the overall response. If we don't get the warning then deal
2801 * with per non-PRDR. */
2802 if(sx.prdr_active)
2803 {
2804 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2805 sx.ob->final_timeout);
2806 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2807 {
2808 case '2': sx.prdr_active = FALSE;
2809 sx.ok = TRUE;
2810 break;
2811 case '4': errno = ERRNO_DATA4XX;
2812 addrlist->more_errno |=
2813 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2814 break;
2815 }
2816 }
2817 else
2818 #endif
2819
2820 /* For non-PRDR SMTP, we now read a single response that applies to the
2821 whole message. If it is OK, then all the addresses have been delivered. */
2822
2823 if (!sx.lmtp)
2824 {
2825 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2826 sx.ob->final_timeout);
2827 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2828 {
2829 errno = ERRNO_DATA4XX;
2830 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2831 }
2832 }
2833
2834 /* For LMTP, we get back a response for every RCPT command that we sent;
2835 some may be accepted and some rejected. For those that get a response, their
2836 status is fixed; any that are accepted have been handed over, even if later
2837 responses crash - at least, that's how I read RFC 2033.
2838
2839 If all went well, mark the recipient addresses as completed, record which
2840 host/IPaddress they were delivered to, and cut out RSET when sending another
2841 message down the same channel. Write the completed addresses to the journal
2842 now so that they are recorded in case there is a crash of hardware or
2843 software before the spool gets updated. Also record the final SMTP
2844 confirmation if needed (for SMTP only). */
2845
2846 if (sx.ok)
2847 {
2848 int flag = '=';
2849 int delivery_time = (int)(time(NULL) - start_delivery_time);
2850 int len;
2851 uschar *conf = NULL;
2852
2853 sx.send_rset = FALSE;
2854 pipelining_active = FALSE;
2855
2856 /* Set up confirmation if needed - applies only to SMTP */
2857
2858 if (
2859 #ifdef DISABLE_EVENT
2860 LOGGING(smtp_confirmation) &&
2861 #endif
2862 !sx.lmtp
2863 )
2864 {
2865 const uschar *s = string_printing(sx.buffer);
2866 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2867 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2868 }
2869
2870 /* Process all transported addresses - for LMTP or PRDR, read a status for
2871 each one. */
2872
2873 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2874 {
2875 if (addr->transport_return != PENDING_OK) continue;
2876
2877 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2878 remaining addresses. Otherwise, it's a return code for just the one
2879 address. For temporary errors, add a retry item for the address so that
2880 it doesn't get tried again too soon. */
2881
2882 #ifndef DISABLE_PRDR
2883 if (sx.lmtp || sx.prdr_active)
2884 #else
2885 if (sx.lmtp)
2886 #endif
2887 {
2888 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2889 sx.ob->final_timeout))
2890 {
2891 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2892 addr->message = string_sprintf(
2893 #ifndef DISABLE_PRDR
2894 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2895 #else
2896 "LMTP error after %s: %s",
2897 #endif
2898 data_command, string_printing(sx.buffer));
2899 setflag(addr, af_pass_message); /* Allow message to go to user */
2900 if (sx.buffer[0] == '5')
2901 addr->transport_return = FAIL;
2902 else
2903 {
2904 errno = ERRNO_DATA4XX;
2905 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2906 addr->transport_return = DEFER;
2907 #ifndef DISABLE_PRDR
2908 if (!sx.prdr_active)
2909 #endif
2910 retry_add_item(addr, addr->address_retry_key, 0);
2911 }
2912 continue;
2913 }
2914 sx.completed_addr = TRUE; /* NOW we can set this flag */
2915 if (LOGGING(smtp_confirmation))
2916 {
2917 const uschar *s = string_printing(sx.buffer);
2918 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2919 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2920 }
2921 }
2922
2923 /* SMTP, or success return from LMTP for this address. Pass back the
2924 actual host that was used. */
2925
2926 addr->transport_return = OK;
2927 addr->more_errno = delivery_time;
2928 addr->host_used = host;
2929 addr->special_action = flag;
2930 addr->message = conf;
2931 #ifndef DISABLE_PRDR
2932 if (sx.prdr_active) addr->flags |= af_prdr_used;
2933 #endif
2934 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2935 flag = '-';
2936
2937 #ifndef DISABLE_PRDR
2938 if (!sx.prdr_active)
2939 #endif
2940 {
2941 /* Update the journal. For homonymic addresses, use the base address plus
2942 the transport name. See lots of comments in deliver.c about the reasons
2943 for the complications when homonyms are involved. Just carry on after
2944 write error, as it may prove possible to update the spool file later. */
2945
2946 if (testflag(addr, af_homonym))
2947 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2948 else
2949 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2950
2951 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2952 len = Ustrlen(CS sx.buffer);
2953 if (write(journal_fd, sx.buffer, len) != len)
2954 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2955 "%s: %s", sx.buffer, strerror(errno));
2956 }
2957 }
2958
2959 #ifndef DISABLE_PRDR
2960 if (sx.prdr_active)
2961 {
2962 /* PRDR - get the final, overall response. For any non-success
2963 upgrade all the address statuses. */
2964 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2965 sx.ob->final_timeout);
2966 if (!sx.ok)
2967 {
2968 if(errno == 0 && sx.buffer[0] == '4')
2969 {
2970 errno = ERRNO_DATA4XX;
2971 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2972 }
2973 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2974 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2975 addr->transport_return = PENDING_OK; /* allow set_errno action */
2976 goto RESPONSE_FAILED;
2977 }
2978
2979 /* Update the journal, or setup retry. */
2980 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2981 if (addr->transport_return == OK)
2982 {
2983 if (testflag(addr, af_homonym))
2984 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2985 else
2986 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2987
2988 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
2989 len = Ustrlen(CS sx.buffer);
2990 if (write(journal_fd, sx.buffer, len) != len)
2991 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2992 "%s: %s", sx.buffer, strerror(errno));
2993 }
2994 else if (addr->transport_return == DEFER)
2995 retry_add_item(addr, addr->address_retry_key, -2);
2996 }
2997 #endif
2998
2999 /* Ensure the journal file is pushed out to disk. */
3000
3001 if (EXIMfsync(journal_fd) < 0)
3002 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3003 strerror(errno));
3004 }
3005 }
3006
3007
3008 /* Handle general (not specific to one address) failures here. The value of ok
3009 is used to skip over this code on the falling through case. A timeout causes a
3010 deferral. Other errors may defer or fail according to the response code, and
3011 may set up a special errno value, e.g. after connection chopped, which is
3012 assumed if errno == 0 and there is no text in the buffer. If control reaches
3013 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3014 the problem is not related to this specific message. */
3015
3016 if (!sx.ok)
3017 {
3018 int code, set_rc;
3019 uschar * set_message;
3020
3021 RESPONSE_FAILED:
3022 {
3023 save_errno = errno;
3024 message = NULL;
3025 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3026 sx.buffer, &code, &message, &pass_message);
3027 goto FAILED;
3028 }
3029
3030 SEND_FAILED:
3031 {
3032 save_errno = errno;
3033 code = '4';
3034 message = US string_sprintf("send() to %s [%s] failed: %s",
3035 host->name, host->address, strerror(save_errno));
3036 sx.send_quit = FALSE;
3037 goto FAILED;
3038 }
3039
3040 FAILED:
3041 {
3042 BOOL message_error;
3043
3044 sx.ok = FALSE; /* For when reached by GOTO */
3045 set_message = message;
3046
3047 /* We want to handle timeouts after MAIL or "." and loss of connection after
3048 "." specially. They can indicate a problem with the sender address or with
3049 the contents of the message rather than a real error on the connection. These
3050 cases are treated in the same way as a 4xx response. This next bit of code
3051 does the classification. */
3052
3053 switch(save_errno)
3054 {
3055 case 0:
3056 case ERRNO_MAIL4XX:
3057 case ERRNO_DATA4XX:
3058 message_error = TRUE;
3059 break;
3060
3061 case ETIMEDOUT:
3062 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3063 Ustrncmp(smtp_command,"end ",4) == 0;
3064 break;
3065
3066 case ERRNO_SMTPCLOSED:
3067 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3068 break;
3069
3070 default:
3071 message_error = FALSE;
3072 break;
3073 }
3074
3075 /* Handle the cases that are treated as message errors. These are:
3076
3077 (a) negative response or timeout after MAIL
3078 (b) negative response after DATA
3079 (c) negative response or timeout or dropped connection after "."
3080 (d) utf8 support required and not offered
3081
3082 It won't be a negative response or timeout after RCPT, as that is dealt
3083 with separately above. The action in all cases is to set an appropriate
3084 error code for all the addresses, but to leave yield set to OK because the
3085 host itself has not failed. Of course, it might in practice have failed
3086 when we've had a timeout, but if so, we'll discover that at the next
3087 delivery attempt. For a temporary error, set the message_defer flag, and
3088 write to the logs for information if this is not the last host. The error
3089 for the last host will be logged as part of the address's log line. */
3090
3091 if (message_error)
3092 {
3093 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3094
3095 /* If there's an errno, the message contains just the identity of
3096 the host. */
3097
3098 if (code == '5')
3099 set_rc = FAIL;
3100 else /* Anything other than 5 is treated as temporary */
3101 {
3102 set_rc = DEFER;
3103 if (save_errno > 0)
3104 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3105 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3106 msglog_line(host, message);
3107 *message_defer = TRUE;
3108 }
3109 }
3110
3111 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3112 ".", or some other transportation error. We defer all addresses and yield
3113 DEFER, except for the case of failed add_headers expansion, or a transport
3114 filter failure, when the yield should be ERROR, to stop it trying other
3115 hosts. */
3116
3117 else
3118 {
3119 set_rc = DEFER;
3120 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3121 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3122 }
3123 }
3124
3125 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3126 #ifdef EXPERIMENTAL_DSN_INFO
3127 , sx.smtp_greeting, sx.helo_response
3128 #endif
3129 );
3130 }
3131
3132
3133 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3134 SMTP session tidily. However, if there were too many addresses to send in one
3135 message (indicated by first_addr being non-NULL) we want to carry on with the
3136 rest of them. Also, it is desirable to send more than one message down the SMTP
3137 connection if there are several waiting, provided we haven't already sent so
3138 many as to hit the configured limit. The function transport_check_waiting looks
3139 for a waiting message and returns its id. Then transport_pass_socket tries to
3140 set up a continued delivery by passing the socket on to another process. The
3141 variable send_rset is FALSE if a message has just been successfully transfered.
3142
3143 If we are already sending down a continued channel, there may be further
3144 addresses not yet delivered that are aimed at the same host, but which have not
3145 been passed in this run of the transport. In this case, continue_more will be
3146 true, and all we should do is send RSET if necessary, and return, leaving the
3147 channel open.
3148
3149 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3150 do not want to continue with other messages down the same channel, because that
3151 can lead to looping between two or more messages, all with the same,
3152 temporarily failing address(es). [The retry information isn't updated yet, so
3153 new processes keep on trying.] We probably also don't want to try more of this
3154 message's addresses either.
3155
3156 If we have started a TLS session, we have to end it before passing the
3157 connection to a new process. However, not all servers can handle this (Exim
3158 can), so we do not pass such a connection on if the host matches
3159 hosts_nopass_tls. */
3160
3161 DEBUG(D_transport)
3162 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3163 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3164 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3165
3166 if (sx.completed_addr && sx.ok && sx.send_quit)
3167 {
3168 BOOL more;
3169 smtp_compare_t t_compare;
3170
3171 t_compare.tblock = tblock;
3172 t_compare.current_sender_address = sender_address;
3173
3174 if ( sx.first_addr != NULL
3175 || continue_more
3176 || ( ( tls_out.active < 0
3177 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3178 )
3179 &&
3180 transport_check_waiting(tblock->name, host->name,
3181 tblock->connection_max_messages, new_message_id, &more,
3182 (oicf)smtp_are_same_identities, (void*)&t_compare)
3183 ) )
3184 {
3185 uschar *msg;
3186 BOOL pass_message;
3187
3188 if (sx.send_rset)
3189 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3190 {
3191 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3192 host->address, strerror(save_errno));
3193 sx.send_quit = FALSE;
3194 }
3195 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3196 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3197 {
3198 int code;
3199 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3200 &pass_message);
3201 if (!sx.send_quit)
3202 {
3203 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3204 host->name, host->address, msg);
3205 }
3206 }
3207
3208 /* Either RSET was not needed, or it succeeded */
3209
3210 if (sx.ok)
3211 {
3212 if (sx.first_addr != NULL) /* More addresses still to be sent */
3213 { /* in this run of the transport */
3214 continue_sequence++; /* Causes * in logging */
3215 goto SEND_MESSAGE;
3216 }
3217 if (continue_more) return yield; /* More addresses for another run */
3218
3219 /* Pass the socket to a new Exim process. Before doing so, we must shut
3220 down TLS. Not all MTAs allow for the continuation of the SMTP session
3221 when TLS is shut down. We test for this by sending a new EHLO. If we
3222 don't get a good response, we don't attempt to pass the socket on. */
3223
3224 #ifdef SUPPORT_TLS
3225 if (tls_out.active >= 0)
3226 {
3227 tls_close(FALSE, TRUE);
3228 smtp_peer_options = smtp_peer_options_wrap;
3229 sx.ok = !sx.smtps
3230 && smtp_write_command(&sx.outblock, FALSE,
3231 "EHLO %s\r\n", sx.helo_data) >= 0
3232 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3233 '2', sx.ob->command_timeout);
3234 }
3235 #endif
3236
3237 /* If the socket is successfully passed, we mustn't send QUIT (or
3238 indeed anything!) from here. */
3239
3240 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3241 propagate it from the initial
3242 */
3243 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3244 host->address, new_message_id, sx.inblock.sock))
3245 sx.send_quit = FALSE;
3246 }
3247
3248 /* If RSET failed and there are addresses left, they get deferred. */
3249
3250 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3251 #ifdef EXPERIMENTAL_DSN_INFO
3252 , sx.smtp_greeting, sx.helo_response
3253 #endif
3254 );
3255 }
3256 }
3257
3258 /* End off tidily with QUIT unless the connection has died or the socket has
3259 been passed to another process. There has been discussion on the net about what
3260 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3261 to wait for a response, but on the other hand, there isn't anything one can do
3262 with an error response, other than log it. Exim used to do that. However,
3263 further discussion suggested that it is positively advantageous not to wait for
3264 the response, but to close the session immediately. This is supposed to move
3265 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3266 load from the server. (Hosts that are both servers and clients may not see much
3267 difference, of course.) Further discussion indicated that this was safe to do
3268 on Unix systems which have decent implementations of TCP/IP that leave the
3269 connection around for a while (TIME_WAIT) after the application has gone away.
3270 This enables the response sent by the server to be properly ACKed rather than
3271 timed out, as can happen on broken TCP/IP implementations on other OS.
3272
3273 This change is being made on 31-Jul-98. After over a year of trouble-free
3274 operation, the old commented-out code was removed on 17-Sep-99. */
3275
3276 SEND_QUIT:
3277 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3278
3279 END_OFF:
3280
3281 #ifdef SUPPORT_TLS
3282 tls_close(FALSE, TRUE);
3283 #endif
3284
3285 /* Close the socket, and return the appropriate value, first setting
3286 works because the NULL setting is passed back to the calling process, and
3287 remote_max_parallel is forced to 1 when delivering over an existing connection,
3288
3289 If all went well and continue_more is set, we shouldn't actually get here if
3290 there are further addresses, as the return above will be taken. However,
3291 writing RSET might have failed, or there may be other addresses whose hosts are
3292 specified in the transports, and therefore not visible at top level, in which
3293 case continue_more won't get set. */
3294
3295 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3296 if (sx.send_quit)
3297 {
3298 shutdown(sx.outblock.sock, SHUT_WR);
3299 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3300 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3301 rc--; /* drain socket */
3302 }
3303 (void)close(sx.inblock.sock);
3304
3305 #ifndef DISABLE_EVENT
3306 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3307 #endif
3308
3309 continue_transport = NULL;
3310 continue_hostname = NULL;
3311 return yield;
3312 }
3313
3314
3315
3316
3317 /*************************************************
3318 * Closedown entry point *
3319 *************************************************/
3320
3321 /* This function is called when exim is passed an open smtp channel
3322 from another incarnation, but the message which it has been asked
3323 to deliver no longer exists. The channel is on stdin.
3324
3325 We might do fancy things like looking for another message to send down
3326 the channel, but if the one we sought has gone, it has probably been
3327 delivered by some other process that itself will seek further messages,
3328 so just close down our connection.
3329
3330 Argument: pointer to the transport instance block
3331 Returns: nothing
3332 */
3333
3334 void
3335 smtp_transport_closedown(transport_instance *tblock)
3336 {
3337 smtp_transport_options_block *ob =
3338 (smtp_transport_options_block *)tblock->options_block;
3339 smtp_inblock inblock;
3340 smtp_outblock outblock;
3341 uschar buffer[256];
3342 uschar inbuffer[4096];
3343 uschar outbuffer[16];
3344
3345 inblock.sock = fileno(stdin);
3346 inblock.buffer = inbuffer;
3347 inblock.buffersize = sizeof(inbuffer);
3348 inblock.ptr = inbuffer;
3349 inblock.ptrend = inbuffer;
3350
3351 outblock.sock = inblock.sock;
3352 outblock.buffersize = sizeof(outbuffer);
3353 outblock.buffer = outbuffer;
3354 outblock.ptr = outbuffer;
3355 outblock.cmd_count = 0;
3356 outblock.authenticating = FALSE;
3357
3358 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3359 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3360 ob->command_timeout);
3361 (void)close(inblock.sock);
3362 }
3363
3364
3365
3366 /*************************************************
3367 * Prepare addresses for delivery *
3368 *************************************************/
3369
3370 /* This function is called to flush out error settings from previous delivery
3371 attempts to other hosts. It also records whether we got here via an MX record
3372 or not in the more_errno field of the address. We are interested only in
3373 addresses that are still marked DEFER - others may have got delivered to a
3374 previously considered IP address. Set their status to PENDING_DEFER to indicate
3375 which ones are relevant this time.
3376
3377 Arguments:
3378 addrlist the list of addresses
3379 host the host we are delivering to
3380
3381 Returns: the first address for this delivery
3382 */
3383
3384 static address_item *
3385 prepare_addresses(address_item *addrlist, host_item *host)
3386 {
3387 address_item *first_addr = NULL;
3388 address_item *addr;
3389 for (addr = addrlist; addr; addr = addr->next)
3390 if (addr->transport_return == DEFER)
3391 {
3392 if (!first_addr) first_addr = addr;
3393 addr->transport_return = PENDING_DEFER;
3394 addr->basic_errno = 0;
3395 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3396 addr->message = NULL;
3397 #ifdef SUPPORT_TLS
3398 addr->cipher = NULL;
3399 addr->ourcert = NULL;
3400 addr->peercert = NULL;
3401 addr->peerdn = NULL;
3402 addr->ocsp = OCSP_NOT_REQ;
3403 #endif
3404 #ifdef EXPERIMENTAL_DSN_INFO
3405 addr->smtp_greeting = NULL;
3406 addr->helo_response = NULL;
3407 #endif
3408 }
3409 return first_addr;
3410 }
3411
3412
3413
3414 /*************************************************
3415 * Main entry point *
3416 *************************************************/
3417
3418 /* See local README for interface details. As this is a remote transport, it is
3419 given a chain of addresses to be delivered in one connection, if possible. It
3420 always returns TRUE, indicating that each address has its own independent
3421 status set, except if there is a setting up problem, in which case it returns
3422 FALSE. */
3423
3424 BOOL
3425 smtp_transport_entry(
3426 transport_instance *tblock, /* data for this instantiation */
3427 address_item *addrlist) /* addresses we are working on */
3428 {
3429 int cutoff_retry;
3430 int port;
3431 int hosts_defer = 0;
3432 int hosts_fail = 0;
3433 int hosts_looked_up = 0;
3434 int hosts_retry = 0;
3435 int hosts_serial = 0;
3436 int hosts_total = 0;
3437 int total_hosts_tried = 0;
3438 address_item *addr;
3439 BOOL expired = TRUE;
3440 uschar *expanded_hosts = NULL;
3441 uschar *pistring;
3442 uschar *tid = string_sprintf("%s transport", tblock->name);
3443 smtp_transport_options_block *ob =
3444 (smtp_transport_options_block *)(tblock->options_block);
3445 host_item *hostlist = addrlist->host_list;
3446 host_item *host = NULL;
3447
3448 DEBUG(D_transport)
3449 {
3450 debug_printf("%s transport entered\n", tblock->name);
3451 for (addr = addrlist; addr; addr = addr->next)
3452 debug_printf(" %s\n", addr->address);
3453 if (hostlist)
3454 {
3455 debug_printf("hostlist:\n");
3456 for (host = hostlist; host; host = host->next)
3457 debug_printf(" %s:%d\n", host->name, host->port);
3458 }
3459 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3460 continue_hostname, continue_host_address);
3461 }
3462
3463 /* Set the flag requesting that these hosts be added to the waiting
3464 database if the delivery fails temporarily or if we are running with
3465 queue_smtp or a 2-stage queue run. This gets unset for certain
3466 kinds of error, typically those that are specific to the message. */
3467
3468 update_waiting = TRUE;
3469
3470 /* If a host list is not defined for the addresses - they must all have the
3471 same one in order to be passed to a single transport - or if the transport has
3472 a host list with hosts_override set, use the host list supplied with the
3473 transport. It is an error for this not to exist. */
3474
3475 if (!hostlist || (ob->hosts_override && ob->hosts))
3476 {
3477 if (!ob->hosts)
3478 {
3479 addrlist->message = string_sprintf("%s transport called with no hosts set",
3480 tblock->name);
3481 addrlist->transport_return = PANIC;
3482 return FALSE; /* Only top address has status */
3483 }
3484
3485 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3486 ob->hosts);
3487
3488 /* If the transport's host list contains no '$' characters, and we are not
3489 randomizing, it is fixed and therefore a chain of hosts can be built once
3490 and for all, and remembered for subsequent use by other calls to this
3491 transport. If, on the other hand, the host list does contain '$', or we are
3492 randomizing its order, we have to rebuild it each time. In the fixed case,
3493 as the hosts string will never be used again, it doesn't matter that we
3494 replace all the : characters with zeros. */
3495
3496 if (!ob->hostlist)
3497 {
3498 uschar *s = ob->hosts;
3499
3500 if (Ustrchr(s, '$') != NULL)
3501 {
3502 if (!(expanded_hosts = expand_string(s)))
3503 {
3504 addrlist->message = string_sprintf("failed to expand list of hosts "
3505 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3506 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3507 return FALSE; /* Only top address has status */
3508 }
3509 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3510 "\"%s\"\n", s, expanded_hosts);
3511 s = expanded_hosts;
3512 }
3513 else
3514 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3515
3516 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3517
3518 /* Check that the expansion yielded something useful. */
3519 if (!hostlist)
3520 {
3521 addrlist->message =
3522 string_sprintf("%s transport has empty hosts setting", tblock->name);
3523 addrlist->transport_return = PANIC;
3524 return FALSE; /* Only top address has status */
3525 }
3526
3527 /* If there was no expansion of hosts, save the host list for
3528 next time. */
3529
3530 if (!expanded_hosts) ob->hostlist = hostlist;
3531 }
3532
3533 /* This is not the first time this transport has been run in this delivery;
3534 the host list was built previously. */
3535
3536 else
3537 hostlist = ob->hostlist;
3538 }
3539
3540 /* The host list was supplied with the address. If hosts_randomize is set, we
3541 must sort it into a random order if it did not come from MX records and has not
3542 already been randomized (but don't bother if continuing down an existing
3543 connection). */
3544
3545 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3546 {
3547 host_item *newlist = NULL;
3548 while (hostlist)
3549 {
3550 host_item *h = hostlist;
3551 hostlist = hostlist->next;
3552
3553 h->sort_key = random_number(100);
3554
3555 if (!newlist)
3556 {
3557 h->next = NULL;
3558 newlist = h;
3559 }
3560 else if (h->sort_key < newlist->sort_key)
3561 {
3562 h->next = newlist;
3563 newlist = h;
3564 }
3565 else
3566 {
3567 host_item *hh = newlist;
3568 while (hh->next)
3569 {
3570 if (h->sort_key < hh->next->sort_key) break;
3571 hh = hh->next;
3572 }
3573 h->next = hh->next;
3574 hh->next = h;
3575 }
3576 }
3577
3578 hostlist = addrlist->host_list = newlist;
3579 }
3580
3581 /* Sort out the default port. */
3582
3583 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3584
3585 /* For each host-plus-IP-address on the list:
3586
3587 . If this is a continued delivery and the host isn't the one with the
3588 current connection, skip.
3589
3590 . If the status is unusable (i.e. previously failed or retry checked), skip.
3591
3592 . If no IP address set, get the address, either by turning the name into
3593 an address, calling gethostbyname if gethostbyname is on, or by calling
3594 the DNS. The DNS may yield multiple addresses, in which case insert the
3595 extra ones into the list.
3596
3597 . Get the retry data if not previously obtained for this address and set the
3598 field which remembers the state of this address. Skip if the retry time is
3599 not reached. If not, remember whether retry data was found. The retry string
3600 contains both the name and the IP address.
3601
3602 . Scan the list of addresses and mark those whose status is DEFER as
3603 PENDING_DEFER. These are the only ones that will be processed in this cycle
3604 of the hosts loop.
3605
3606 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3607 Some addresses may be successfully delivered, others may fail, and yet
3608 others may get temporary errors and so get marked DEFER.
3609
3610 . The return from the delivery attempt is OK if a connection was made and a
3611 valid SMTP dialogue was completed. Otherwise it is DEFER.
3612
3613 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3614
3615 . If fail to connect, or other defer state, add a retry item.
3616
3617 . If there are any addresses whose status is still DEFER, carry on to the
3618 next host/IPaddress, unless we have tried the number of hosts given
3619 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3620 there is some fancy logic for hosts_max_try that means its limit can be
3621 overstepped in some circumstances.
3622
3623 If we get to the end of the list, all hosts have deferred at least one address,
3624 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3625 delivery attempt to those hosts whose last try was before the arrival time of
3626 the current message. To cope with this, we have to go round the loop a second
3627 time. After that, set the status and error data for any addresses that haven't
3628 had it set already. */
3629
3630 for (cutoff_retry = 0;
3631 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3632 cutoff_retry++)
3633 {
3634 host_item *nexthost = NULL;
3635 int unexpired_hosts_tried = 0;
3636
3637 for (host = hostlist;
3638 host
3639 && unexpired_hosts_tried < ob->hosts_max_try
3640 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3641 host = nexthost)
3642 {
3643 int rc;
3644 int host_af;
3645 uschar *rs;
3646 BOOL host_is_expired = FALSE;
3647 BOOL message_defer = FALSE;
3648 BOOL some_deferred = FALSE;
3649 address_item *first_addr = NULL;
3650 uschar *interface = NULL;
3651 uschar *retry_host_key = NULL;
3652 uschar *retry_message_key = NULL;
3653 uschar *serialize_key = NULL;
3654
3655 /* Default next host is next host. :-) But this can vary if the
3656 hosts_max_try limit is hit (see below). It may also be reset if a host
3657 address is looked up here (in case the host was multihomed). */
3658
3659 nexthost = host->next;
3660
3661 /* If the address hasn't yet been obtained from the host name, look it up
3662 now, unless the host is already marked as unusable. If it is marked as
3663 unusable, it means that the router was unable to find its IP address (in
3664 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3665 the lookup failed last time. We don't get this far if *all* MX records
3666 point to non-existent hosts; that is treated as a hard error.
3667
3668 We can just skip this host entirely. When the hosts came from the router,
3669 the address will timeout based on the other host(s); when the address is
3670 looked up below, there is an explicit retry record added.
3671
3672 Note that we mustn't skip unusable hosts if the address is not unset; they
3673 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3674
3675 if (!host->address)
3676 {
3677 int new_port, flags;
3678 host_item *hh;
3679
3680 if (host->status >= hstatus_unusable)
3681 {
3682 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3683 host->name);
3684 continue;
3685 }
3686
3687 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3688
3689 /* The host name is permitted to have an attached port. Find it, and
3690 strip it from the name. Just remember it for now. */
3691
3692 new_port = host_item_get_port(host);
3693
3694 /* Count hosts looked up */
3695
3696 hosts_looked_up++;
3697
3698 /* Find by name if so configured, or if it's an IP address. We don't
3699 just copy the IP address, because we need the test-for-local to happen. */
3700
3701 flags = HOST_FIND_BY_A;
3702 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3703 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3704
3705 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3706 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3707 else
3708 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3709 &ob->dnssec, /* domains for request/require */
3710 NULL, NULL);
3711
3712 /* Update the host (and any additional blocks, resulting from
3713 multihoming) with a host-specific port, if any. */
3714
3715 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3716
3717 /* Failure to find the host at this time (usually DNS temporary failure)
3718 is really a kind of routing failure rather than a transport failure.
3719 Therefore we add a retry item of the routing kind, not to stop us trying
3720 to look this name up here again, but to ensure the address gets timed
3721 out if the failures go on long enough. A complete failure at this point
3722 commonly points to a configuration error, but the best action is still
3723 to carry on for the next host. */
3724
3725 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3726 {
3727 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3728 expired = FALSE;
3729 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3730 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3731 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3732 host->status = hstatus_unusable;
3733
3734 for (addr = addrlist; addr; addr = addr->next)
3735 {
3736 if (addr->transport_return != DEFER) continue;
3737 addr->basic_errno = ERRNO_UNKNOWNHOST;
3738 addr->message =
3739 string_sprintf("failed to lookup IP address for %s", host->name);
3740 }
3741 continue;
3742 }
3743
3744 /* If the host is actually the local host, we may have a problem, or
3745 there may be some cunning configuration going on. In the problem case,
3746 log things and give up. The default transport status is already DEFER. */
3747
3748 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3749 {
3750 for (addr = addrlist; addr; addr = addr->next)
3751 {
3752 addr->basic_errno = 0;
3753 addr->message = string_sprintf("%s transport found host %s to be "
3754 "local", tblock->name, host->name);
3755 }
3756 goto END_TRANSPORT;
3757 }
3758 } /* End of block for IP address lookup */
3759
3760 /* If this is a continued delivery, we are interested only in the host
3761 which matches the name of the existing open channel. The check is put
3762 here after the local host lookup, in case the name gets expanded as a
3763 result of the lookup. Set expired FALSE, to save the outer loop executing
3764 twice. */
3765
3766 if ( continue_hostname
3767 && ( Ustrcmp(continue_hostname, host->name) != 0
3768 || Ustrcmp(continue_host_address, host->address) != 0
3769 ) )
3770 {
3771 expired = FALSE;
3772 continue; /* With next host */
3773 }
3774
3775 /* Reset the default next host in case a multihomed host whose addresses
3776 are not looked up till just above added to the host list. */
3777
3778 nexthost = host->next;
3779
3780 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3781 domain is in queue_smtp_domains, we don't actually want to attempt any
3782 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3783 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3784 were not in it. We don't want to hold up all SMTP deliveries! Except when
3785 doing a two-stage queue run, don't do this if forcing. */
3786
3787 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3788 match_isinlist(addrlist->domain,
3789 (const uschar **)&queue_smtp_domains, 0,
3790 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3791 {
3792 expired = FALSE;
3793 for (addr = addrlist; addr; addr = addr->next)
3794 if (addr->transport_return == DEFER)
3795 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3796 continue; /* With next host */
3797 }
3798
3799 /* Count hosts being considered - purely for an intelligent comment
3800 if none are usable. */
3801
3802 hosts_total++;
3803
3804 /* Set $host and $host address now in case they are needed for the
3805 interface expansion or the serialize_hosts check; they remain set if an
3806 actual delivery happens. */
3807
3808 deliver_host = host->name;
3809 deliver_host_address = host->address;
3810 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3811 : host->dnssec == DS_NO ? US"no"
3812 : US"";
3813
3814 /* Set up a string for adding to the retry key if the port number is not
3815 the standard SMTP port. A host may have its own port setting that overrides
3816 the default. */
3817
3818 pistring = string_sprintf(":%d", host->port == PORT_NONE
3819 ? port : host->port);
3820 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3821
3822 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3823 string is set, even if constant (as different transports can have different
3824 constant settings), we must add it to the key that is used for retries,
3825 because connections to the same host from a different interface should be
3826 treated separately. */
3827
3828 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3829 if ((rs = ob->interface) && *rs)
3830 {
3831 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3832 return FALSE;
3833 pistring = string_sprintf("%s/%s", pistring, interface);
3834 }
3835
3836 /* The first time round the outer loop, check the status of the host by
3837 inspecting the retry data. The second time round, we are interested only
3838 in expired hosts that haven't been tried since this message arrived. */
3839
3840 if (cutoff_retry == 0)
3841 {
3842 BOOL incl_ip;
3843 /* Ensure the status of the address is set by checking retry data if
3844 necessary. There may be host-specific retry data (applicable to all
3845 messages) and also data for retries of a specific message at this host.
3846 If either of these retry records are actually read, the keys used are
3847 returned to save recomputing them later. */
3848
3849 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3850 US"retry_include_ip_address", ob->retry_include_ip_address,
3851 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3852 continue; /* with next host */
3853
3854 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3855 incl_ip, &retry_host_key, &retry_message_key);
3856
3857 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3858 (host->address == NULL)? US"" : host->address, pistring,
3859 (host->status == hstatus_usable)? "usable" :
3860 (host->status == hstatus_unusable)? "unusable" :
3861 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3862
3863 /* Skip this address if not usable at this time, noting if it wasn't
3864 actually expired, both locally and in the address. */
3865
3866 switch (host->status)
3867 {
3868 case hstatus_unusable:
3869 expired = FALSE;
3870 setflag(addrlist, af_retry_skipped);
3871 /* Fall through */
3872
3873 case hstatus_unusable_expired:
3874 switch (host->why)
3875 {
3876 case hwhy_retry: hosts_retry++; break;
3877 case hwhy_failed: hosts_fail++; break;
3878 case hwhy_deferred: hosts_defer++; break;
3879 }
3880
3881 /* If there was a retry message key, implying that previously there
3882 was a message-specific defer, we don't want to update the list of
3883 messages waiting for these hosts. */
3884
3885 if (retry_message_key) update_waiting = FALSE;
3886 continue; /* With the next host or IP address */
3887 }
3888 }
3889
3890 /* Second time round the loop: if the address is set but expired, and
3891 the message is newer than the last try, let it through. */
3892
3893 else
3894 {
3895 if ( !host->address
3896 || host->status != hstatus_unusable_expired
3897 || host->last_try > received_time)
3898 continue;
3899 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3900 host->name, host->address, pistring);
3901 host_is_expired = TRUE;
3902 }
3903
3904 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3905 it remains TRUE only if all hosts are expired and none are actually tried.
3906 */
3907
3908 expired = FALSE;
3909
3910 /* If this host is listed as one to which access must be serialized,
3911 see if another Exim process has a connection to it, and if so, skip
3912 this host. If not, update the database to record our connection to it
3913 and remember this for later deletion. Do not do any of this if we are
3914 sending the message down a pre-existing connection. */
3915
3916 if ( !continue_hostname
3917 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3918 {
3919 serialize_key = string_sprintf("host-serialize-%s", host->name);
3920 if (!enq_start(serialize_key, 1))
3921 {
3922 DEBUG(D_transport)
3923 debug_printf("skipping host %s because another Exim process "
3924 "is connected to it\n", host->name);
3925 hosts_serial++;
3926 continue;
3927 }
3928 }
3929
3930 /* OK, we have an IP address that is not waiting for its retry time to
3931 arrive (it might be expired) OR (second time round the loop) we have an
3932 expired host that hasn't been tried since the message arrived. Have a go
3933 at delivering the message to it. First prepare the addresses by flushing
3934 out the result of previous attempts, and finding the first address that
3935 is still to be delivered. */
3936
3937 first_addr = prepare_addresses(addrlist, host);
3938
3939 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3940 message_id, host->name, host->address, addrlist->address,
3941 addrlist->next ? ", ..." : "");
3942
3943 set_process_info("delivering %s to %s [%s] (%s%s)",
3944 message_id, host->name, host->address, addrlist->address,
3945 addrlist->next ? ", ..." : "");
3946
3947 /* This is not for real; don't do the delivery. If there are
3948 any remaining hosts, list them. */
3949
3950 if (dont_deliver)
3951 {
3952 host_item *host2;
3953 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3954 for (addr = addrlist; addr; addr = addr->next)
3955 {
3956 addr->host_used = host;
3957 addr->special_action = '*';
3958 addr->message = US"delivery bypassed by -N option";
3959 }
3960 DEBUG(D_transport)
3961 {
3962 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3963 "*** host and remaining hosts:\n", tblock->name);
3964 for (host2 = host; host2; host2 = host2->next)
3965 debug_printf(" %s [%s]\n", host2->name,
3966 host2->address ? host2->address : US"unset");
3967 }
3968 rc = OK;
3969 }
3970
3971 /* This is for real. If the host is expired, we don't count it for
3972 hosts_max_retry. This ensures that all hosts must expire before an address
3973 is timed out, unless hosts_max_try_hardlimit (which protects against
3974 lunatic DNS configurations) is reached.
3975
3976 If the host is not expired and we are about to hit the hosts_max_retry
3977 limit, check to see if there is a subsequent hosts with a different MX
3978 value. If so, make that the next host, and don't count this one. This is a
3979 heuristic to make sure that different MXs do get tried. With a normal kind
3980 of retry rule, they would get tried anyway when the earlier hosts were
3981 delayed, but if the domain has a "retry every time" type of rule - as is
3982 often used for the the very large ISPs, that won't happen. */
3983
3984 else
3985 {
3986 host_item * thost;
3987 /* Make a copy of the host if it is local to this invocation
3988 of the transport. */
3989
3990 if (expanded_hosts)
3991 {
3992 thost = store_get(sizeof(host_item));
3993 *thost = *host;
3994 thost->name = string_copy(host->name);
3995 thost->address = string_copy(host->address);
3996 }
3997 else
3998 thost = host;
3999
4000 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4001 {
4002 host_item *h;
4003 DEBUG(D_transport)
4004 debug_printf("hosts_max_try limit reached with this host\n");
4005 for (h = host; h; h = h->next) if (h->mx != host->mx)
4006 {
4007 nexthost = h;
4008 unexpired_hosts_tried--;
4009 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4010 "and will be tried\n");
4011 break;
4012 }
4013 }
4014
4015 /* Attempt the delivery. */
4016
4017 total_hosts_tried++;
4018 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4019 &message_defer, FALSE);
4020
4021 /* Yield is one of:
4022 OK => connection made, each address contains its result;
4023 message_defer is set for message-specific defers (when all
4024 recipients are marked defer)
4025 DEFER => there was a non-message-specific delivery problem;
4026 ERROR => there was a problem setting up the arguments for a filter,
4027 or there was a problem with expanding added headers
4028 */
4029
4030 /* If the result is not OK, there was a non-message-specific problem.
4031 If the result is DEFER, we need to write to the logs saying what happened
4032 for this particular host, except in the case of authentication and TLS
4033 failures, where the log has already been written. If all hosts defer a
4034 general message is written at the end. */
4035
4036 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4037 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4038 write_logs(first_addr, host);
4039
4040 #ifndef DISABLE_EVENT
4041 if (rc == DEFER)
4042 deferred_event_raise(first_addr, host);
4043 #endif
4044
4045 /* If STARTTLS was accepted, but there was a failure in setting up the
4046 TLS session (usually a certificate screwup), and the host is not in
4047 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4048 TLS forcibly turned off. We have to start from scratch with a new SMTP
4049 connection. That's why the retry is done from here, not from within
4050 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4051 session, so the in-clear transmission after those errors, if permitted,
4052 happens inside smtp_deliver().] */
4053
4054 #ifdef SUPPORT_TLS
4055 if ( rc == DEFER
4056 && first_addr->basic_errno == ERRNO_TLSFAILURE
4057 && ob->tls_tempfail_tryclear
4058 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4059 )
4060 {
4061 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4062 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4063 first_addr = prepare_addresses(addrlist, host);
4064 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4065 &message_defer, TRUE);
4066 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4067 write_logs(first_addr, host);
4068 # ifndef DISABLE_EVENT
4069 if (rc == DEFER)
4070 deferred_event_raise(first_addr, host);
4071 # endif
4072 }
4073 #endif /*SUPPORT_TLS*/
4074 }
4075
4076 /* Delivery attempt finished */
4077
4078 rs = rc == OK ? US"OK"
4079 : rc == DEFER ? US"DEFER"
4080 : rc == ERROR ? US"ERROR"
4081 : US"?";
4082
4083 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4084 message_id, host->name, host->address, addrlist->address,
4085 addrlist->next ? " (& others)" : "", rs);
4086
4087 /* Release serialization if set up */
4088
4089 if (serialize_key) enq_end(serialize_key);
4090
4091 /* If the result is DEFER, or if a host retry record is known to exist, we
4092 need to add an item to the retry chain for updating the retry database
4093 at the end of delivery. We only need to add the item to the top address,
4094 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4095 for any other delivery attempts using the same address. (It is copied into
4096 the unusable tree at the outer level, so even if different address blocks
4097 contain the same address, it still won't get tried again.) */
4098
4099 if (rc == DEFER || retry_host_key)
4100 {
4101 int delete_flag = rc != DEFER ? rf_delete : 0;
4102 if (!retry_host_key)
4103 {
4104 BOOL incl_ip;
4105 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4106 US"retry_include_ip_address", ob->retry_include_ip_address,
4107 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4108 incl_ip = TRUE; /* error; use most-specific retry record */
4109
4110 retry_host_key = incl_ip
4111 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4112 : string_sprintf("T:%S%s", host->name, pistring);
4113 }
4114
4115 /* If a delivery of another message over an existing SMTP connection
4116 yields DEFER, we do NOT set up retry data for the host. This covers the
4117 case when there are delays in routing the addresses in the second message
4118 that are so long that the server times out. This is alleviated by not
4119 routing addresses that previously had routing defers when handling an
4120 existing connection, but even so, this case may occur (e.g. if a
4121 previously happily routed address starts giving routing defers). If the
4122 host is genuinely down, another non-continued message delivery will
4123 notice it soon enough. */
4124
4125 if (delete_flag != 0 || !continue_hostname)
4126 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4127
4128 /* We may have tried an expired host, if its retry time has come; ensure
4129 the status reflects the expiry for the benefit of any other addresses. */
4130
4131 if (rc == DEFER)
4132 {
4133 host->status = host_is_expired
4134 ? hstatus_unusable_expired : hstatus_unusable;
4135 host->why = hwhy_deferred;
4136 }
4137 }
4138
4139 /* If message_defer is set (host was OK, but every recipient got deferred
4140 because of some message-specific problem), or if that had happened
4141 previously so that a message retry key exists, add an appropriate item
4142 to the retry chain. Note that if there was a message defer but now there is
4143 a host defer, the message defer record gets deleted. That seems perfectly
4144 reasonable. Also, stop the message from being remembered as waiting
4145 for specific hosts. */
4146
4147 if (message_defer || retry_message_key)
4148 {
4149 int delete_flag = message_defer ? 0 : rf_delete;
4150 if (!retry_message_key)
4151 {
4152 BOOL incl_ip;
4153 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4154 US"retry_include_ip_address", ob->retry_include_ip_address,
4155 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4156 incl_ip = TRUE; /* error; use most-specific retry record */
4157
4158 retry_message_key = incl_ip
4159 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4160 message_id)
4161 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4162 }
4163 retry_add_item(addrlist, retry_message_key,
4164 rf_message | rf_host | delete_flag);
4165 update_waiting = FALSE;
4166 }
4167
4168 /* Any return other than DEFER (that is, OK or ERROR) means that the
4169 addresses have got their final statuses filled in for this host. In the OK
4170 case, see if any of them are deferred. */
4171
4172 if (rc == OK)
4173 for (addr = addrlist; addr; addr = addr->next)
4174 if (addr->transport_return == DEFER)
4175 {
4176 some_deferred = TRUE;
4177 break;
4178 }
4179
4180 /* If no addresses deferred or the result was ERROR, return. We do this for
4181 ERROR because a failing filter set-up or add_headers expansion is likely to
4182 fail for any host we try. */
4183
4184 if (rc == ERROR || (rc == OK && !some_deferred))
4185 {
4186 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4187 return TRUE; /* Each address has its status */
4188 }
4189
4190 /* If the result was DEFER or some individual addresses deferred, let
4191 the loop run to try other hosts with the deferred addresses, except for the
4192 case when we were trying to deliver down an existing channel and failed.
4193 Don't try any other hosts in this case. */
4194
4195 if (continue_hostname) break;
4196
4197 /* If the whole delivery, or some individual addresses, were deferred and
4198 there are more hosts that could be tried, do not count this host towards
4199 the hosts_max_try limit if the age of the message is greater than the
4200 maximum retry time for this host. This means we may try try all hosts,
4201 ignoring the limit, when messages have been around for some time. This is
4202 important because if we don't try all hosts, the address will never time
4203 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4204
4205 if ((rc == DEFER || some_deferred) && nexthost)
4206 {
4207 BOOL timedout;
4208 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4209
4210 if (retry && retry->rules)
4211 {
4212 retry_rule *last_rule;
4213 for (last_rule = retry->rules;
4214 last_rule->next;
4215 last_rule = last_rule->next);
4216 timedout = time(NULL) - received_time > last_rule->timeout;
4217 }
4218 else timedout = TRUE; /* No rule => timed out */
4219
4220 if (timedout)
4221 {
4222 unexpired_hosts_tried--;
4223 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4224 "hosts_max_try (message older than host's retry time)\n");
4225 }
4226 }
4227 } /* End of loop for trying multiple hosts. */
4228
4229 /* This is the end of the loop that repeats iff expired is TRUE and
4230 ob->delay_after_cutoff is FALSE. The second time round we will
4231 try those hosts that haven't been tried since the message arrived. */
4232
4233 DEBUG(D_transport)
4234 {
4235 debug_printf("all IP addresses skipped or deferred at least one address\n");
4236 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4237 debug_printf("retrying IP addresses not tried since message arrived\n");
4238 }
4239 }
4240
4241
4242 /* Get here if all IP addresses are skipped or defer at least one address. In
4243 MUA wrapper mode, this will happen only for connection or other non-message-
4244 specific failures. Force the delivery status for all addresses to FAIL. */
4245
4246 if (mua_wrapper)
4247 {
4248 for (addr = addrlist; addr; addr = addr->next)
4249 addr->transport_return = FAIL;
4250 goto END_TRANSPORT;
4251 }
4252
4253 /* In the normal, non-wrapper case, add a standard message to each deferred
4254 address if there hasn't been an error, that is, if it hasn't actually been
4255 tried this time. The variable "expired" will be FALSE if any deliveries were
4256 actually tried, or if there was at least one host that was not expired. That
4257 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4258 a delivery has been tried, an error code will be set, and the failing of the
4259 message is handled by the retry code later.
4260
4261 If queue_smtp is set, or this transport was called to send a subsequent message
4262 down an existing TCP/IP connection, and something caused the host not to be
4263 found, we end up here, but can detect these cases and handle them specially. */
4264
4265 for (addr = addrlist; addr; addr = addr->next)
4266 {
4267 /* If host is not NULL, it means that we stopped processing the host list
4268 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4269 means we need to behave as if some hosts were skipped because their retry
4270 time had not come. Specifically, this prevents the address from timing out.
4271 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4272 hosts were tried. */
4273
4274 if (host)
4275 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4276 {
4277 DEBUG(D_transport)
4278 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4279 "hosts were tried\n");
4280 }
4281 else
4282 {
4283 DEBUG(D_transport)
4284 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4285 setflag(addr, af_retry_skipped);
4286 }
4287
4288 if (queue_smtp) /* no deliveries attempted */
4289 {
4290 addr->transport_return = DEFER;
4291 addr->basic_errno = 0;
4292 addr->message = US"SMTP delivery explicitly queued";
4293 }
4294
4295 else if ( addr->transport_return == DEFER
4296 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4297 && !addr->message
4298 )
4299 {
4300 addr->basic_errno = ERRNO_HRETRY;
4301 if (continue_hostname)
4302 addr->message = US"no host found for existing SMTP connection";
4303 else if (expired)
4304 {
4305 setflag(addr, af_pass_message); /* This is not a security risk */
4306 addr->message = string_sprintf(
4307 "all hosts%s have been failing for a long time %s",
4308 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4309 ob->delay_after_cutoff
4310 ? US"(and retry time not reached)"
4311 : US"and were last tried after this message arrived");
4312
4313 /* If we are already using fallback hosts, or there are no fallback hosts
4314 defined, convert the result to FAIL to cause a bounce. */
4315
4316 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4317 addr->transport_return = FAIL;
4318 }
4319 else
4320 {
4321 const char * s;
4322 if (hosts_retry == hosts_total)
4323 s = "retry time not reached for any host%s";
4324 else if (hosts_fail == hosts_total)
4325 s = "all host address lookups%s failed permanently";
4326 else if (hosts_defer == hosts_total)
4327 s = "all host address lookups%s failed temporarily";
4328 else if (hosts_serial == hosts_total)
4329 s = "connection limit reached for all hosts%s";
4330 else if (hosts_fail+hosts_defer == hosts_total)
4331 s = "all host address lookups%s failed";
4332 else
4333 s = "some host address lookups failed and retry time "
4334 "not reached for other hosts or connection limit reached%s";
4335
4336 addr->message = string_sprintf(s,
4337 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4338 }
4339 }
4340 }
4341
4342 /* Update the database which keeps information about which messages are waiting
4343 for which hosts to become available. For some message-specific errors, the
4344 update_waiting flag is turned off because we don't want follow-on deliveries in
4345 those cases. If this transport instance is explicitly limited to one message
4346 per connection then follow-on deliveries are not possible and there's no need
4347 to create/update the per-transport wait-<transport_name> database. */
4348
4349 if (update_waiting && tblock->connection_max_messages != 1)
4350 transport_update_waiting(hostlist, tblock->name);
4351
4352 END_TRANSPORT:
4353
4354 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4355
4356 return TRUE; /* Each address has its status */
4357 }
4358
4359 /* vi: aw ai sw=2
4360 */
4361 /* End of transport/smtp.c */
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