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