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DANE: Remove fallback from hosts_try_dane. If TLSA record not retrieved,
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef SUPPORT_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
252 #ifdef SUPPORT_SOCKS
253 ,NULL /* socks_proxy */
254 #endif
255 #ifdef SUPPORT_TLS
256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
263 NULL, /* tls_sni */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
271 #endif
272 #ifndef DISABLE_DKIM
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
279 #endif
280 };
281
282 /* some DSN flags for use later */
283
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
288
289
290
291 /* Local statics */
292
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
296
297
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
301
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
308
309 Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
316
317 Returns: OK always (FAIL, DEFER not used)
318 */
319
320 static int
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
323 {
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327 errmsg = errmsg; /* Keep picky compilers happy */
328 uid = uid;
329 gid = gid;
330
331 /* Pass back options if required. This interface is getting very messy. */
332
333 if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
345 }
346
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
349 list. */
350
351 if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358 return OK;
359 }
360
361
362
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
366
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
369 to be set up.
370
371 Argument: pointer to the transport instance block
372 Returns: nothing
373 */
374
375 void
376 smtp_transport_init(transport_instance *tblock)
377 {
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381 /* Retry_use_local_part defaults FALSE if unset */
382
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386 /* Set the default port according to the protocol */
387
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
391
392 /* Set up the setup entry point, to be called before subprocesses for this
393 transport. */
394
395 tblock->setup = smtp_transport_setup;
396
397 /* Complain if any of the timeouts are zero. */
398
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
407
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
412
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
414
415 #ifdef SUPPORT_TLS
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
422 #endif
423 }
424
425
426
427
428
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
432
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
435
436 Arguments:
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
445
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
449
450 Returns: nothing
451 */
452
453 static void
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458 #endif
459 )
460 {
461 address_item *addr;
462 int orvalue = 0;
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
470 {
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
480 {
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490 #endif
491 }
492 }
493 }
494
495 static void
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498 {
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502 #endif
503 );
504 }
505
506
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
510
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
515 chosen.
516
517 Arguments:
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
527 */
528
529 static BOOL
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
532 {
533 uschar *pl = US"";
534
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541 *yield = '4'; /* Default setting is to give a temporary error */
542
543 /* Handle response timeout */
544
545 if (*errno_value == ETIMEDOUT)
546 {
547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555 /* Handle malformed SMTP response */
556
557 if (*errno_value == ERRNO_SMTPFORMAT)
558 {
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
566 return FALSE;
567 }
568
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
570 end the DATA. */
571
572 if (*errno_value == ERRNO_FILTER_FAIL)
573 {
574 *message = US string_sprintf("transport filter process failed (%d)%s",
575 more_errno,
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
577 return FALSE;
578 }
579
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581 end the DATA. */
582
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591 /* Handle failure to write a complete data block */
592
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
599 #ifdef SUPPORT_I18N
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
602 {
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607 #endif
608
609 /* Handle error responses from the remote mailer. */
610
611 if (buffer[0] != 0)
612 {
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
617 *yield = buffer[0];
618 return TRUE;
619 }
620
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
626
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
628 {
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
632 }
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635 return FALSE;
636 }
637
638
639
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
643
644 /* This writes to the main log and to the message log.
645
646 Arguments:
647 addr the address item containing error information
648 host the current host
649
650 Returns: nothing
651 */
652
653 static void
654 write_logs(address_item *addr, host_item *host)
655 {
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
658 if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
661 if (addr->message)
662 {
663 message = string_sprintf("%s: %s", message, addr->message);
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669 else
670 {
671 const uschar * s = exim_errstr(addr->basic_errno);
672 log_write(0, LOG_MAIN, "%s %s", message, s);
673 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
674 }
675 }
676
677 static void
678 msglog_line(host_item * host, uschar * message)
679 {
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
682 }
683
684
685
686 #ifndef DISABLE_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
690
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694 Arguments:
695 addr the address item containing error information
696 host the current host
697
698 Returns: nothing
699 */
700
701 static void
702 deferred_event_raise(address_item *addr, host_item *host)
703 {
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
706 uschar * save_local;
707
708 if (!action)
709 return;
710
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
713
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
718
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
723
724 (void) event_raise(action, US"msg:host:defer",
725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
736 }
737 #endif
738
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
742
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
748 of code.
749
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
754
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
763
764 Arguments:
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
780
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788 */
789
790 static int
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796 {
797 address_item *addr = *sync_addr;
798 int yield = 0;
799
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
803
804 if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
826 errno = save_errno;
827 }
828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
836 return -3;
837 }
838 }
839
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
844 */
845
846 while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
851 addr->host_used = host;
852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
861
862 if (testflag(addr, af_dr_retry_exists))
863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
868 }
869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
921
922 #ifndef DISABLE_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
925 #endif
926
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
929
930 if (host->next)
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
932
933 #ifndef DISABLE_EVENT
934 else
935 msg_event_raise(US"msg:rcpt:defer", addr);
936 #endif
937
938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
940
941 update_waiting = FALSE;
942
943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
945 to the retry key. */
946
947 if (address_retry_include_sender)
948 {
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
950 sender_address);
951 retry_add_item(addr, altkey, 0);
952 }
953 else retry_add_item(addr, addr->address_retry_key, 0);
954 }
955 }
956 } /* Loop for next RCPT response */
957
958 /* Update where to start at for the next block of responses, unless we
959 have already handled all the addresses. */
960
961 if (addr != NULL) *sync_addr = addr->next;
962
963 /* Handle a response to DATA. If we have not had any good recipients, either
964 previously or in this block, the response is ignored. */
965
966 if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
968 {
969 int code;
970 uschar *msg;
971 BOOL pass_message;
972 if (pending_DATA > 0 || (yield & 1) != 0)
973 {
974 if (errno == 0 && buffer[0] == '4')
975 {
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
978 }
979 return -3;
980 }
981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
984 }
985
986 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987 present) received 3xx. If any RCPTs were handled and yielded anything other
988 than 4xx, yield will be set non-zero. */
989
990 return yield;
991 }
992
993
994
995 /* Do the client side of smtp-level authentication */
996 /*
997 Arguments:
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1003
1004 Returns:
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1008
1009 FAIL_SEND Failed communications - transmit
1010 FAIL - response
1011 */
1012
1013 int
1014 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1017 {
1018 int require_auth;
1019 uschar *fail_reason = US"server did not advertise AUTH support";
1020
1021 smtp_authenticated = FALSE;
1022 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1023 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1024
1025 if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1027 FALSE, TRUE);
1028
1029 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1030 {
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
1033
1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
1036
1037 if (require_auth == OK ||
1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1039 {
1040 auth_instance *au;
1041 fail_reason = US"no common mechanisms were found";
1042
1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1044
1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1049 */
1050
1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1052 {
1053 uschar *p = names;
1054 if (!au->client ||
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1058 {
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1060 au->name,
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1063 continue;
1064 }
1065
1066 /* Loop to scan supported server mechanisms */
1067
1068 while (*p != 0)
1069 {
1070 int rc;
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
1073
1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1076 {
1077 while (*p != 0 && !isspace(*p)) p++;
1078 continue;
1079 }
1080
1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
1084
1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1091 au->name, rc);
1092
1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
1097
1098 switch(rc)
1099 {
1100 case OK:
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1105 break;
1106
1107 /* Failure after writing a command */
1108
1109 case FAIL_SEND:
1110 return FAIL_SEND;
1111
1112 /* Failure after reading a response */
1113
1114 case FAIL:
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1118 break;
1119
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1125
1126 case CANCELLED:
1127 if (*buffer != 0)
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1131 break;
1132
1133 /* Internal problem, message in buffer. */
1134
1135 case ERROR:
1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1137 DEFER, FALSE);
1138 return ERROR;
1139 }
1140
1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
1144 }
1145 }
1146
1147 /* If we haven't authenticated, but are required to, give up. */
1148
1149 if (require_auth == OK && !smtp_authenticated)
1150 {
1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
1153 FALSE);
1154 return DEFER;
1155 }
1156
1157 return OK;
1158 }
1159
1160
1161 /* Construct AUTH appendix string for MAIL TO */
1162 /*
1163 Arguments
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1167
1168 Globals smtp_authenticated
1169 client_authenticated_sender
1170 Return True on error, otherwise buffer has (possibly empty) terminated string
1171 */
1172
1173 BOOL
1174 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1176 {
1177 uschar *local_authenticated_sender = authenticated_sender;
1178
1179 #ifdef notdef
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1181 #endif
1182
1183 if (ob->authenticated_sender != NULL)
1184 {
1185 uschar *new = expand_string(ob->authenticated_sender);
1186 if (new == NULL)
1187 {
1188 if (!expand_string_forcedfail)
1189 {
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1193 return TRUE;
1194 }
1195 }
1196 else if (new[0] != 0) local_authenticated_sender = new;
1197 }
1198
1199 /* Add the authenticated sender address if present */
1200
1201 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1203 {
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1208 }
1209 else
1210 *buffer= 0;
1211
1212 return FALSE;
1213 }
1214
1215
1216
1217 #ifdef EXPERIMENTAL_DANE
1218 int
1219 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1220 {
1221 /* move this out to host.c given the similarity to dns_lookup() ? */
1222 uschar buffer[300];
1223 const uschar * fullname = buffer;
1224
1225 /* TLSA lookup string */
1226 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1227
1228 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1229 {
1230 case DNS_AGAIN:
1231 return DEFER; /* just defer this TLS'd conn */
1232
1233 default:
1234 case DNS_FAIL:
1235 return dane_required ? FAIL : DEFER;
1236
1237 case DNS_SUCCEED:
1238 if (!dns_is_secure(dnsa))
1239 {
1240 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1241 return DEFER;
1242 }
1243 return OK;
1244 }
1245 }
1246 #endif
1247
1248
1249
1250 typedef struct smtp_compare_s
1251 {
1252 uschar *current_sender_address;
1253 struct transport_instance *tblock;
1254 } smtp_compare_t;
1255
1256 /*
1257 Create a unique string that identifies this message, it is based on
1258 sender_address, helo_data and tls_certificate if enabled. */
1259
1260 static uschar *
1261 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1262 {
1263 address_item * addr1;
1264 uschar * if1 = US"";
1265 uschar * helo1 = US"";
1266 #ifdef SUPPORT_TLS
1267 uschar * tlsc1 = US"";
1268 #endif
1269 uschar * save_sender_address = sender_address;
1270 uschar * local_identity = NULL;
1271 smtp_transport_options_block * ob =
1272 (smtp_transport_options_block *)tblock->options_block;
1273
1274 sender_address = sender;
1275
1276 addr1 = deliver_make_addr (sender, TRUE);
1277 deliver_set_expansions(addr1);
1278
1279 if (ob->interface)
1280 if1 = expand_string(ob->interface);
1281
1282 if (ob->helo_data)
1283 helo1 = expand_string(ob->helo_data);
1284
1285 #ifdef SUPPORT_TLS
1286 if (ob->tls_certificate)
1287 tlsc1 = expand_string(ob->tls_certificate);
1288 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1289 #else
1290 local_identity = string_sprintf ("%s^%s", if1, helo1);
1291 #endif
1292
1293 deliver_set_expansions(NULL);
1294 sender_address = save_sender_address;
1295
1296 return local_identity;
1297 }
1298
1299
1300
1301 /* This routine is a callback that is called from transport_check_waiting.
1302 This function will evaluate the incoming message versus the previous
1303 message. If the incoming message is using a different local identity then
1304 we will veto this new message. */
1305
1306 static BOOL
1307 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1308 {
1309
1310 uschar * message_local_identity,
1311 * current_local_identity,
1312 * new_sender_address;
1313
1314 current_local_identity =
1315 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1316
1317 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1318 return 0;
1319
1320 message_local_identity =
1321 smtp_local_identity(new_sender_address, s_compare->tblock);
1322
1323 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1324 }
1325
1326
1327
1328 uschar
1329 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1330 {
1331 #ifdef SUPPORT_TLS
1332 if (checks & PEER_OFFERED_TLS)
1333 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_TLS;
1335 #endif
1336
1337 if ( checks & PEER_OFFERED_IGNQ
1338 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1339 PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_IGNQ;
1341
1342 #ifndef DISABLE_PRDR
1343 if ( checks & PEER_OFFERED_PRDR
1344 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_PRDR;
1346 #endif
1347
1348 #ifdef SUPPORT_I18N
1349 if ( checks & PEER_OFFERED_UTF8
1350 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_UTF8;
1352 #endif
1353
1354 if ( checks & PEER_OFFERED_DSN
1355 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~PEER_OFFERED_DSN;
1357
1358 if ( checks & PEER_OFFERED_PIPE
1359 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1360 PCRE_EOPT, NULL, 0) < 0)
1361 checks &= ~PEER_OFFERED_PIPE;
1362
1363 if ( checks & PEER_OFFERED_SIZE
1364 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~PEER_OFFERED_SIZE;
1366
1367 return checks;
1368 }
1369
1370
1371 /*************************************************
1372 * Deliver address list to given host *
1373 *************************************************/
1374
1375 /* If continue_hostname is not null, we get here only when continuing to
1376 deliver down an existing channel. The channel was passed as the standard
1377 input. TLS is never active on a passed channel; the previous process always
1378 closes it down before passing the connection on.
1379
1380 Otherwise, we have to make a connection to the remote host, and do the
1381 initial protocol exchange.
1382
1383 When running as an MUA wrapper, if the sender or any recipient is rejected,
1384 temporarily or permanently, we force failure for all recipients.
1385
1386 Arguments:
1387 addrlist chain of potential addresses to deliver; only those whose
1388 transport_return field is set to PENDING_DEFER are currently
1389 being processed; others should be skipped - they have either
1390 been delivered to an earlier host or IP address, or been
1391 failed by one of them.
1392 host host to deliver to
1393 host_af AF_INET or AF_INET6
1394 port default TCP/IP port to use, in host byte order
1395 interface interface to bind to, or NULL
1396 tblock transport instance block
1397 message_defer set TRUE if yield is OK, but all addresses were deferred
1398 because of a non-recipient, non-host failure, that is, a
1399 4xx response to MAIL FROM, DATA, or ".". This is a defer
1400 that is specific to the message.
1401 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1402 a second attempt after TLS initialization fails
1403
1404 Returns: OK - the connection was made and the delivery attempted;
1405 the result for each address is in its data block.
1406 DEFER - the connection could not be made, or something failed
1407 while setting up the SMTP session, or there was a
1408 non-message-specific error, such as a timeout.
1409 ERROR - a filter command is specified for this transport,
1410 and there was a problem setting it up; OR helo_data
1411 or add_headers or authenticated_sender is specified
1412 for this transport, and the string failed to expand
1413 */
1414
1415 static int
1416 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1417 uschar *interface, transport_instance *tblock,
1418 BOOL *message_defer, BOOL suppress_tls)
1419 {
1420 address_item *addr;
1421 address_item *sync_addr;
1422 address_item *first_addr = addrlist;
1423 int yield = OK;
1424 int address_count;
1425 int save_errno;
1426 int rc;
1427 time_t start_delivery_time = time(NULL);
1428 smtp_transport_options_block *ob =
1429 (smtp_transport_options_block *)(tblock->options_block);
1430 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1431 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1432 BOOL ok = FALSE;
1433 BOOL send_rset = TRUE;
1434 BOOL send_quit = TRUE;
1435 BOOL setting_up = TRUE;
1436 BOOL completed_address = FALSE;
1437 BOOL esmtp = TRUE;
1438 BOOL pending_MAIL;
1439 BOOL pass_message = FALSE;
1440 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1441 #ifndef DISABLE_PRDR
1442 BOOL prdr_active;
1443 #endif
1444 #ifdef SUPPORT_I18N
1445 BOOL utf8_needed = FALSE;
1446 #endif
1447 BOOL dsn_all_lasthop = TRUE;
1448 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1449 BOOL dane = FALSE;
1450 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1451 dns_answer tlsa_dnsa;
1452 #endif
1453 smtp_inblock inblock;
1454 smtp_outblock outblock;
1455 int max_rcpt = tblock->max_addresses;
1456 uschar *igquotstr = US"";
1457
1458 #ifdef EXPERIMENTAL_DSN_INFO
1459 uschar *smtp_greeting = NULL;
1460 uschar *helo_response = NULL;
1461 #endif
1462 uschar *helo_data = NULL;
1463
1464 uschar *message = NULL;
1465 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1466 uschar *p;
1467 uschar buffer[4096];
1468 uschar inbuffer[4096];
1469 uschar outbuffer[4096];
1470
1471 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1472
1473 *message_defer = FALSE;
1474 smtp_command = US"initial connection";
1475 if (max_rcpt == 0) max_rcpt = 999999;
1476
1477 /* Set up the buffer for reading SMTP response packets. */
1478
1479 inblock.buffer = inbuffer;
1480 inblock.buffersize = sizeof(inbuffer);
1481 inblock.ptr = inbuffer;
1482 inblock.ptrend = inbuffer;
1483
1484 /* Set up the buffer for holding SMTP commands while pipelining */
1485
1486 outblock.buffer = outbuffer;
1487 outblock.buffersize = sizeof(outbuffer);
1488 outblock.ptr = outbuffer;
1489 outblock.cmd_count = 0;
1490 outblock.authenticating = FALSE;
1491
1492 /* Reset the parameters of a TLS session. */
1493
1494 tls_out.bits = 0;
1495 tls_out.cipher = NULL; /* the one we may use for this transport */
1496 tls_out.ourcert = NULL;
1497 tls_out.peercert = NULL;
1498 tls_out.peerdn = NULL;
1499 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1500 tls_out.sni = NULL;
1501 #endif
1502 tls_out.ocsp = OCSP_NOT_REQ;
1503
1504 /* Flip the legacy TLS-related variables over to the outbound set in case
1505 they're used in the context of the transport. Don't bother resetting
1506 afterward as we're in a subprocess. */
1507
1508 tls_modify_variables(&tls_out);
1509
1510 #ifndef SUPPORT_TLS
1511 if (smtps)
1512 {
1513 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1514 DEFER, FALSE);
1515 return ERROR;
1516 }
1517 #endif
1518
1519 /* Make a connection to the host if this isn't a continued delivery, and handle
1520 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1521 specially so they can be identified for retries. */
1522
1523 if (continue_hostname == NULL)
1524 {
1525 /* This puts port into host->port */
1526 inblock.sock = outblock.sock =
1527 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1528
1529 if (inblock.sock < 0)
1530 {
1531 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1532 NULL, DEFER, FALSE);
1533 return DEFER;
1534 }
1535
1536 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1537 {
1538 tls_out.dane_verified = FALSE;
1539 tls_out.tlsa_usage = 0;
1540
1541 if (host->dnssec == DS_YES)
1542 {
1543 if( dane_required
1544 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1545 )
1546 {
1547 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK)
1548 {
1549 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1550 string_sprintf("DANE error: tlsa lookup %s",
1551 rc == DEFER ? "DEFER" : "FAIL"),
1552 rc, FALSE);
1553 return rc;
1554 }
1555 dane = TRUE;
1556 }
1557 }
1558 else if (dane_required)
1559 {
1560 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1561 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1562 FAIL, FALSE);
1563 return FAIL;
1564 }
1565
1566 if (dane)
1567 ob->tls_tempfail_tryclear = FALSE;
1568 }
1569 #endif /*DANE*/
1570
1571 /* Expand the greeting message while waiting for the initial response. (Makes
1572 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1573 delayed till here so that $sending_interface and $sending_port are set. */
1574
1575 helo_data = expand_string(ob->helo_data);
1576 #ifdef SUPPORT_I18N
1577 if (helo_data)
1578 {
1579 uschar * errstr = NULL;
1580 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1581 {
1582 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1583 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1584 yield = DEFER;
1585 goto SEND_QUIT;
1586 }
1587 }
1588 #endif
1589
1590 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1591 is nevertheless a reasonably clean way of programming this kind of logic,
1592 where you want to escape on any error. */
1593
1594 if (!smtps)
1595 {
1596 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1597 '2', ob->command_timeout);
1598 #ifdef EXPERIMENTAL_DSN_INFO
1599 smtp_greeting = string_copy(buffer);
1600 #endif
1601 if (!good_response) goto RESPONSE_FAILED;
1602
1603 #ifndef DISABLE_EVENT
1604 {
1605 uschar * s;
1606 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1607 : host->dnssec==DS_NO ? US"no" : NULL;
1608 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1609 if (s)
1610 {
1611 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1612 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1613 DEFER, FALSE);
1614 yield = DEFER;
1615 goto SEND_QUIT;
1616 }
1617 }
1618 #endif
1619
1620 /* Now check if the helo_data expansion went well, and sign off cleanly if
1621 it didn't. */
1622
1623 if (helo_data == NULL)
1624 {
1625 uschar *message = string_sprintf("failed to expand helo_data: %s",
1626 expand_string_message);
1627 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1628 yield = DEFER;
1629 goto SEND_QUIT;
1630 }
1631 }
1632
1633 /** Debugging without sending a message
1634 addrlist->transport_return = DEFER;
1635 goto SEND_QUIT;
1636 **/
1637
1638 /* Errors that occur after this point follow an SMTP command, which is
1639 left in big_buffer by smtp_write_command() for use in error messages. */
1640
1641 smtp_command = big_buffer;
1642
1643 /* Tell the remote who we are...
1644
1645 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1646 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1647 greeting is of this form. The assumption was that the far end supports it
1648 properly... but experience shows that there are some that give 5xx responses,
1649 even though the banner includes "ESMTP" (there's a bloody-minded one that
1650 says "ESMTP not spoken here"). Cope with that case.
1651
1652 September 2000: Time has passed, and it seems reasonable now to always send
1653 EHLO at the start. It is also convenient to make the change while installing
1654 the TLS stuff.
1655
1656 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1657 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1658 would be no way to send out the mails, so there is now a host list
1659 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1660 PIPELINING problem as well. Maybe it can also be useful to cure other
1661 problems with broken servers.
1662
1663 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1664 Then somebody tried it with a Microsoft mailer... It seems that all other
1665 mailers use upper case for some reason (the RFC is quite clear about case
1666 independence) so, for peace of mind, I gave in. */
1667
1668 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1669
1670 /* Alas; be careful, since this goto is not an error-out, so conceivably
1671 we might set data between here and the target which we assume to exist
1672 and be usable. I can see this coming back to bite us. */
1673 #ifdef SUPPORT_TLS
1674 if (smtps)
1675 {
1676 tls_offered = TRUE;
1677 suppress_tls = FALSE;
1678 ob->tls_tempfail_tryclear = FALSE;
1679 smtp_command = US"SSL-on-connect";
1680 goto TLS_NEGOTIATE;
1681 }
1682 #endif
1683
1684 if (esmtp)
1685 {
1686 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1687 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1688 goto SEND_FAILED;
1689 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1690 ob->command_timeout))
1691 {
1692 if (errno != 0 || buffer[0] == 0 || lmtp)
1693 {
1694 #ifdef EXPERIMENTAL_DSN_INFO
1695 helo_response = string_copy(buffer);
1696 #endif
1697 goto RESPONSE_FAILED;
1698 }
1699 esmtp = FALSE;
1700 }
1701 #ifdef EXPERIMENTAL_DSN_INFO
1702 helo_response = string_copy(buffer);
1703 #endif
1704 }
1705 else
1706 {
1707 DEBUG(D_transport)
1708 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1709 }
1710
1711 if (!esmtp)
1712 {
1713 BOOL good_response;
1714
1715 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1716 goto SEND_FAILED;
1717 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1718 '2', ob->command_timeout);
1719 #ifdef EXPERIMENTAL_DSN_INFO
1720 helo_response = string_copy(buffer);
1721 #endif
1722 if (!good_response) goto RESPONSE_FAILED;
1723 }
1724
1725 if (esmtp || lmtp)
1726 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1727 PEER_OFFERED_TLS
1728 | 0 /* IGNQ checked later */
1729 | 0 /* PRDR checked later */
1730 | 0 /* UTF8 checked later */
1731 | 0 /* DSN checked later */
1732 | 0 /* PIPE checked later */
1733 | 0 /* SIZE checked later */
1734 );
1735
1736 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1737
1738 #ifdef SUPPORT_TLS
1739 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1740 #endif
1741 }
1742
1743 /* For continuing deliveries down the same channel, the socket is the standard
1744 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1745 below). Set up the pointer to where subsequent commands will be left, for
1746 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1747 set from the command line if they were set in the process that passed the
1748 connection on. */
1749
1750 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1751 as the contine goes via transport_pass_socket() and doublefork and exec.
1752 It does not wait. Unclear how we keep separate host's responses
1753 separate - we could match up by host ip+port as a bodge. */
1754
1755 else
1756 {
1757 inblock.sock = outblock.sock = fileno(stdin);
1758 smtp_command = big_buffer;
1759 host->port = port; /* Record the port that was used */
1760 }
1761
1762 /* If TLS is available on this connection, whether continued or not, attempt to
1763 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1764 send another EHLO - the server may give a different answer in secure mode. We
1765 use a separate buffer for reading the response to STARTTLS so that if it is
1766 negative, the original EHLO data is available for subsequent analysis, should
1767 the client not be required to use TLS. If the response is bad, copy the buffer
1768 for error analysis. */
1769
1770 #ifdef SUPPORT_TLS
1771 if ( tls_offered
1772 && !suppress_tls
1773 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1774 {
1775 uschar buffer2[4096];
1776 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1777 goto SEND_FAILED;
1778
1779 /* If there is an I/O error, transmission of this message is deferred. If
1780 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1781 false, we also defer. However, if there is a temporary rejection of STARTTLS
1782 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1783 STARTTLS, we carry on. This means we will try to send the message in clear,
1784 unless the host is in hosts_require_tls (tested below). */
1785
1786 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1787 ob->command_timeout))
1788 {
1789 if ( errno != 0
1790 || buffer2[0] == 0
1791 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1792 )
1793 {
1794 Ustrncpy(buffer, buffer2, sizeof(buffer));
1795 goto RESPONSE_FAILED;
1796 }
1797 }
1798
1799 /* STARTTLS accepted: try to negotiate a TLS session. */
1800
1801 else
1802 TLS_NEGOTIATE:
1803 {
1804 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1805 # ifdef EXPERIMENTAL_DANE
1806 , dane ? &tlsa_dnsa : NULL
1807 # endif
1808 );
1809
1810 /* TLS negotiation failed; give an error. From outside, this function may
1811 be called again to try in clear on a new connection, if the options permit
1812 it for this host. */
1813
1814 if (rc != OK)
1815 {
1816 # ifdef EXPERIMENTAL_DANE
1817 if (rc == DEFER && dane)
1818 {
1819 log_write(0, LOG_MAIN,
1820 "DANE attempt failed; no TLS connection to %s [%s]",
1821 host->name, host->address);
1822 }
1823 # endif
1824
1825 save_errno = ERRNO_TLSFAILURE;
1826 message = US"failure while setting up TLS session";
1827 send_quit = FALSE;
1828 goto TLS_FAILED;
1829 }
1830
1831 /* TLS session is set up */
1832
1833 for (addr = addrlist; addr; addr = addr->next)
1834 if (addr->transport_return == PENDING_DEFER)
1835 {
1836 addr->cipher = tls_out.cipher;
1837 addr->ourcert = tls_out.ourcert;
1838 addr->peercert = tls_out.peercert;
1839 addr->peerdn = tls_out.peerdn;
1840 addr->ocsp = tls_out.ocsp;
1841 }
1842 }
1843 }
1844
1845 /* if smtps, we'll have smtp_command set to something else; always safe to
1846 reset it here. */
1847 smtp_command = big_buffer;
1848
1849 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1850 helo_data is null, we are dealing with a connection that was passed from
1851 another process, and so we won't have expanded helo_data above. We have to
1852 expand it here. $sending_ip_address and $sending_port are set up right at the
1853 start of the Exim process (in exim.c). */
1854
1855 if (tls_out.active >= 0)
1856 {
1857 char *greeting_cmd;
1858 BOOL good_response;
1859
1860 if (helo_data == NULL)
1861 {
1862 helo_data = expand_string(ob->helo_data);
1863 if (helo_data == NULL)
1864 {
1865 uschar *message = string_sprintf("failed to expand helo_data: %s",
1866 expand_string_message);
1867 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1868 yield = DEFER;
1869 goto SEND_QUIT;
1870 }
1871 }
1872
1873 /* For SMTPS we need to wait for the initial OK response. */
1874 if (smtps)
1875 {
1876 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1877 '2', ob->command_timeout);
1878 #ifdef EXPERIMENTAL_DSN_INFO
1879 smtp_greeting = string_copy(buffer);
1880 #endif
1881 if (!good_response) goto RESPONSE_FAILED;
1882 }
1883
1884 if (esmtp)
1885 greeting_cmd = "EHLO";
1886 else
1887 {
1888 greeting_cmd = "HELO";
1889 DEBUG(D_transport)
1890 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1891 }
1892
1893 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1894 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1895 goto SEND_FAILED;
1896 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1897 '2', ob->command_timeout);
1898 #ifdef EXPERIMENTAL_DSN_INFO
1899 helo_response = string_copy(buffer);
1900 #endif
1901 if (!good_response) goto RESPONSE_FAILED;
1902 }
1903
1904 /* If the host is required to use a secure channel, ensure that we
1905 have one. */
1906
1907 else if (
1908 # ifdef EXPERIMENTAL_DANE
1909 dane ||
1910 # endif
1911 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1912 )
1913 {
1914 save_errno = ERRNO_TLSREQUIRED;
1915 message = string_sprintf("a TLS session is required, but %s",
1916 tls_offered? "an attempt to start TLS failed" :
1917 "the server did not offer TLS support");
1918 goto TLS_FAILED;
1919 }
1920 #endif /*SUPPORT_TLS*/
1921
1922 /* If TLS is active, we have just started it up and re-done the EHLO command,
1923 so its response needs to be analyzed. If TLS is not active and this is a
1924 continued session down a previously-used socket, we haven't just done EHLO, so
1925 we skip this. */
1926
1927 if (continue_hostname == NULL
1928 #ifdef SUPPORT_TLS
1929 || tls_out.active >= 0
1930 #endif
1931 )
1932 {
1933 if (esmtp || lmtp)
1934 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1935 0 /* no TLS */
1936 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1937 | PEER_OFFERED_PRDR
1938 #ifdef SUPPORT_I18N
1939 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1940 /*XXX if we hand peercaps on to continued-conn processes,
1941 must not depend on this addr */
1942 #endif
1943 | PEER_OFFERED_DSN
1944 | PEER_OFFERED_PIPE
1945 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1946 );
1947
1948 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1949 lmtp_ignore_quota option was set. */
1950
1951 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1952
1953 /* If the response to EHLO specified support for the SIZE parameter, note
1954 this, provided size_addition is non-negative. */
1955
1956 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1957
1958 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1959 the current host, esmtp will be false, so PIPELINING can never be used. If
1960 the current host matches hosts_avoid_pipelining, don't do it. */
1961
1962 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1963 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1964
1965 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1966 smtp_use_pipelining ? "" : "not ");
1967
1968 #ifndef DISABLE_PRDR
1969 if ( peer_offered & PEER_OFFERED_PRDR
1970 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1971 peer_offered &= ~PEER_OFFERED_PRDR;
1972
1973 if (peer_offered & PEER_OFFERED_PRDR)
1974 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1975 #endif
1976
1977 /* Note if the server supports DSN */
1978 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1979 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1980
1981 /* Note if the response to EHLO specifies support for the AUTH extension.
1982 If it has, check that this host is one we want to authenticate to, and do
1983 the business. The host name and address must be available when the
1984 authenticator's client driver is running. */
1985
1986 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1987 ob, esmtp, &inblock, &outblock))
1988 {
1989 default: goto SEND_QUIT;
1990 case OK: break;
1991 case FAIL_SEND: goto SEND_FAILED;
1992 case FAIL: goto RESPONSE_FAILED;
1993 }
1994 }
1995
1996 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1997 message-specific. */
1998
1999 setting_up = FALSE;
2000
2001 #ifdef SUPPORT_I18N
2002 if (addrlist->prop.utf8_msg)
2003 {
2004 utf8_needed = !addrlist->prop.utf8_downcvt
2005 && !addrlist->prop.utf8_downcvt_maybe;
2006 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2007 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2008 }
2009
2010 /* If this is an international message we need the host to speak SMTPUTF8 */
2011 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2012 {
2013 errno = ERRNO_UTF8_FWD;
2014 goto RESPONSE_FAILED;
2015 }
2016 #endif
2017
2018 /* If there is a filter command specified for this transport, we can now
2019 set it up. This cannot be done until the identify of the host is known. */
2020
2021 if (tblock->filter_command != NULL)
2022 {
2023 BOOL rc;
2024 uschar buffer[64];
2025 sprintf(CS buffer, "%.50s transport", tblock->name);
2026 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2027 TRUE, DEFER, addrlist, buffer, NULL);
2028 transport_filter_timeout = tblock->filter_timeout;
2029
2030 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2031 yield ERROR. */
2032
2033 if (!rc)
2034 {
2035 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2036 FALSE);
2037 yield = ERROR;
2038 goto SEND_QUIT;
2039 }
2040 }
2041
2042
2043 /* For messages that have more than the maximum number of envelope recipients,
2044 we want to send several transactions down the same SMTP connection. (See
2045 comments in deliver.c as to how this reconciles, heuristically, with
2046 remote_max_parallel.) This optimization was added to Exim after the following
2047 code was already working. The simplest way to put it in without disturbing the
2048 code was to use a goto to jump back to this point when there is another
2049 transaction to handle. */
2050
2051 SEND_MESSAGE:
2052 sync_addr = first_addr;
2053 address_count = 0;
2054 ok = FALSE;
2055 send_rset = TRUE;
2056 completed_address = FALSE;
2057
2058
2059 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2060 qualification, send it, adding something to the message size to allow for
2061 imprecision and things that get added en route. Exim keeps the number of lines
2062 in a message, so we can give an accurate value for the original message, but we
2063 need some additional to handle added headers. (Double "." characters don't get
2064 included in the count.) */
2065
2066 p = buffer;
2067 *p = 0;
2068
2069 if (smtp_use_size)
2070 {
2071 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2072 while (*p) p++;
2073 }
2074
2075 #ifndef DISABLE_PRDR
2076 prdr_active = FALSE;
2077 if (peer_offered & PEER_OFFERED_PRDR)
2078 for (addr = first_addr; addr; addr = addr->next)
2079 if (addr->transport_return == PENDING_DEFER)
2080 {
2081 for (addr = addr->next; addr; addr = addr->next)
2082 if (addr->transport_return == PENDING_DEFER)
2083 { /* at least two recipients to send */
2084 prdr_active = TRUE;
2085 sprintf(CS p, " PRDR"); p += 5;
2086 break;
2087 }
2088 break;
2089 }
2090 #endif
2091
2092 #ifdef SUPPORT_I18N
2093 if ( addrlist->prop.utf8_msg
2094 && !addrlist->prop.utf8_downcvt
2095 && peer_offered & PEER_OFFERED_UTF8
2096 )
2097 sprintf(CS p, " SMTPUTF8"), p += 9;
2098 #endif
2099
2100 /* check if all addresses have lasthop flag */
2101 /* do not send RET and ENVID if true */
2102 for (dsn_all_lasthop = TRUE, addr = first_addr;
2103 address_count < max_rcpt && addr != NULL;
2104 addr = addr->next)
2105 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2106 {
2107 dsn_all_lasthop = FALSE;
2108 break;
2109 }
2110
2111 /* Add any DSN flags to the mail command */
2112
2113 if (smtp_use_dsn && !dsn_all_lasthop)
2114 {
2115 if (dsn_ret == dsn_ret_hdrs)
2116 {
2117 Ustrcpy(p, " RET=HDRS");
2118 while (*p) p++;
2119 }
2120 else if (dsn_ret == dsn_ret_full)
2121 {
2122 Ustrcpy(p, " RET=FULL");
2123 while (*p) p++;
2124 }
2125 if (dsn_envid != NULL)
2126 {
2127 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2128 while (*p) p++;
2129 }
2130 }
2131
2132 /* If an authenticated_sender override has been specified for this transport
2133 instance, expand it. If the expansion is forced to fail, and there was already
2134 an authenticated_sender for this message, the original value will be used.
2135 Other expansion failures are serious. An empty result is ignored, but there is
2136 otherwise no check - this feature is expected to be used with LMTP and other
2137 cases where non-standard addresses (e.g. without domains) might be required. */
2138
2139 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2140 {
2141 yield = ERROR;
2142 goto SEND_QUIT;
2143 }
2144
2145 /* From here until we send the DATA command, we can make use of PIPELINING
2146 if the server host supports it. The code has to be able to check the responses
2147 at any point, for when the buffer fills up, so we write it totally generally.
2148 When PIPELINING is off, each command written reports that it has flushed the
2149 buffer. */
2150
2151 pending_MAIL = TRUE; /* The block starts with MAIL */
2152
2153 {
2154 uschar * s = return_path;
2155 #ifdef SUPPORT_I18N
2156 uschar * errstr = NULL;
2157
2158 /* If we must downconvert, do the from-address here. Remember we had to
2159 for the to-addresses (done below), and also (ugly) for re-doing when building
2160 the delivery log line. */
2161
2162 if ( addrlist->prop.utf8_msg
2163 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2164 )
2165 {
2166 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2167 {
2168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2169 yield = ERROR;
2170 goto SEND_QUIT;
2171 }
2172 setflag(addrlist, af_utf8_downcvt);
2173 }
2174 #endif
2175
2176 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2177 "MAIL FROM:<%s>%s\r\n", s, buffer);
2178 }
2179
2180 mail_command = string_copy(big_buffer); /* Save for later error message */
2181
2182 switch(rc)
2183 {
2184 case -1: /* Transmission error */
2185 goto SEND_FAILED;
2186
2187 case +1: /* Block was sent */
2188 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2189 ob->command_timeout))
2190 {
2191 if (errno == 0 && buffer[0] == '4')
2192 {
2193 errno = ERRNO_MAIL4XX;
2194 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2195 }
2196 goto RESPONSE_FAILED;
2197 }
2198 pending_MAIL = FALSE;
2199 break;
2200 }
2201
2202 /* Pass over all the relevant recipient addresses for this host, which are the
2203 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2204 several before we have to read the responses for those seen so far. This
2205 checking is done by a subroutine because it also needs to be done at the end.
2206 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2207 the next one if not all are sent.
2208
2209 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2210 last address because we want to abort if any recipients have any kind of
2211 problem, temporary or permanent. We know that all recipient addresses will have
2212 the PENDING_DEFER status, because only one attempt is ever made, and we know
2213 that max_rcpt will be large, so all addresses will be done at once. */
2214
2215 for (addr = first_addr;
2216 address_count < max_rcpt && addr != NULL;
2217 addr = addr->next)
2218 {
2219 int count;
2220 BOOL no_flush;
2221 uschar * rcpt_addr;
2222
2223 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2224
2225 if (addr->transport_return != PENDING_DEFER) continue;
2226
2227 address_count++;
2228 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2229
2230 /* Add any DSN flags to the rcpt command and add to the sent string */
2231
2232 p = buffer;
2233 *p = 0;
2234
2235 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2236 {
2237 if ((addr->dsn_flags & rf_dsnflags) != 0)
2238 {
2239 int i;
2240 BOOL first = TRUE;
2241 Ustrcpy(p, " NOTIFY=");
2242 while (*p) p++;
2243 for (i = 0; i < 4; i++)
2244 if ((addr->dsn_flags & rf_list[i]) != 0)
2245 {
2246 if (!first) *p++ = ',';
2247 first = FALSE;
2248 Ustrcpy(p, rf_names[i]);
2249 while (*p) p++;
2250 }
2251 }
2252
2253 if (addr->dsn_orcpt != NULL)
2254 {
2255 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2256 addr->dsn_orcpt);
2257 while (*p) p++;
2258 }
2259 }
2260
2261 /* Now send the RCPT command, and process outstanding responses when
2262 necessary. After a timeout on RCPT, we just end the function, leaving the
2263 yield as OK, because this error can often mean that there is a problem with
2264 just one address, so we don't want to delay the host. */
2265
2266 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2267
2268 #ifdef SUPPORT_I18N
2269 {
2270 uschar * dummy_errstr;
2271 if ( testflag(addrlist, af_utf8_downcvt)
2272 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2273 dummy_errstr
2274 ) )
2275 {
2276 errno = ERRNO_EXPANDFAIL;
2277 goto SEND_FAILED;
2278 }
2279 }
2280 #endif
2281
2282 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2283 rcpt_addr, igquotstr, buffer);
2284
2285 if (count < 0) goto SEND_FAILED;
2286 if (count > 0)
2287 {
2288 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2289 &sync_addr, host, count, ob->address_retry_include_sender,
2290 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2291 sizeof(buffer)))
2292 {
2293 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2294 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2295 break;
2296
2297 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2298 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2299 case 0: /* No 2xx or 5xx, but no probs */
2300 break;
2301
2302 case -1: goto END_OFF; /* Timeout on RCPT */
2303 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2304 }
2305 pending_MAIL = FALSE; /* Dealt with MAIL */
2306 }
2307 } /* Loop for next address */
2308
2309 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2310 permanently or temporarily. We should have flushed and synced after the last
2311 RCPT. */
2312
2313 if (mua_wrapper)
2314 {
2315 address_item *badaddr;
2316 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2317 if (badaddr->transport_return != PENDING_OK)
2318 {
2319 /*XXX could we find a better errno than 0 here? */
2320 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2321 testflag(badaddr, af_pass_message));
2322 ok = FALSE;
2323 break;
2324 }
2325 }
2326
2327 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2328 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2329 have a good recipient buffered up if we are pipelining. We don't want to waste
2330 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2331 are pipelining. The responses are all handled by sync_responses(). */
2332
2333 if (ok || (smtp_use_pipelining && !mua_wrapper))
2334 {
2335 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2336 if (count < 0) goto SEND_FAILED;
2337 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2338 host, count, ob->address_retry_include_sender, pending_MAIL,
2339 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2340 {
2341 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2342 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2343 break;
2344
2345 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2346 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2347 case 0: break; /* No 2xx or 5xx, but no probs */
2348
2349 case -1: goto END_OFF; /* Timeout on RCPT */
2350 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2351 }
2352 }
2353
2354 /* Save the first address of the next batch. */
2355
2356 first_addr = addr;
2357
2358 /* If there were no good recipients (but otherwise there have been no
2359 problems), just set ok TRUE, since we have handled address-specific errors
2360 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2361 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2362 well as body. Set the appropriate timeout value to be used for each chunk.
2363 (Haven't been able to make it work using select() for writing yet.) */
2364
2365 if (!ok) ok = TRUE; else
2366 {
2367 sigalrm_seen = FALSE;
2368 transport_write_timeout = ob->data_timeout;
2369 smtp_command = US"sending data block"; /* For error messages */
2370 DEBUG(D_transport|D_v)
2371 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2372 transport_count = 0;
2373
2374 #ifndef DISABLE_DKIM
2375 ok = dkim_transport_write_message(addrlist, inblock.sock,
2376 topt_use_crlf | topt_end_dot | topt_escape_headers |
2377 (tblock->body_only? topt_no_headers : 0) |
2378 (tblock->headers_only? topt_no_body : 0) |
2379 (tblock->return_path_add? topt_add_return_path : 0) |
2380 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2381 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2382 0, /* No size limit */
2383 tblock->add_headers, tblock->remove_headers,
2384 US".", US"..", /* Escaping strings */
2385 tblock->rewrite_rules, tblock->rewrite_existflags,
2386 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2387 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2388 );
2389 #else
2390 ok = transport_write_message(addrlist, inblock.sock,
2391 topt_use_crlf | topt_end_dot | topt_escape_headers |
2392 (tblock->body_only? topt_no_headers : 0) |
2393 (tblock->headers_only? topt_no_body : 0) |
2394 (tblock->return_path_add? topt_add_return_path : 0) |
2395 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2396 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2397 0, /* No size limit */
2398 tblock->add_headers, tblock->remove_headers,
2399 US".", US"..", /* Escaping strings */
2400 tblock->rewrite_rules, tblock->rewrite_existflags);
2401 #endif
2402
2403 /* transport_write_message() uses write() because it is called from other
2404 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2405 it can exit with "Broken pipe" as its error. This really means that the
2406 socket got closed at the far end. */
2407
2408 transport_write_timeout = 0; /* for subsequent transports */
2409
2410 /* Failure can either be some kind of I/O disaster (including timeout),
2411 or the failure of a transport filter or the expansion of added headers. */
2412
2413 if (!ok)
2414 {
2415 buffer[0] = 0; /* There hasn't been a response */
2416 goto RESPONSE_FAILED;
2417 }
2418
2419 /* We used to send the terminating "." explicitly here, but because of
2420 buffering effects at both ends of TCP/IP connections, you don't gain
2421 anything by keeping it separate, so it might as well go in the final
2422 data buffer for efficiency. This is now done by setting the topt_end_dot
2423 flag above. */
2424
2425 smtp_command = US"end of data";
2426
2427 #ifndef DISABLE_PRDR
2428 /* For PRDR we optionally get a partial-responses warning
2429 * followed by the individual responses, before going on with
2430 * the overall response. If we don't get the warning then deal
2431 * with per non-PRDR. */
2432 if(prdr_active)
2433 {
2434 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2435 ob->final_timeout);
2436 if (!ok && errno == 0)
2437 switch(buffer[0])
2438 {
2439 case '2': prdr_active = FALSE;
2440 ok = TRUE;
2441 break;
2442 case '4': errno = ERRNO_DATA4XX;
2443 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2444 break;
2445 }
2446 }
2447 else
2448 #endif
2449
2450 /* For non-PRDR SMTP, we now read a single response that applies to the
2451 whole message. If it is OK, then all the addresses have been delivered. */
2452
2453 if (!lmtp)
2454 {
2455 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2456 ob->final_timeout);
2457 if (!ok && errno == 0 && buffer[0] == '4')
2458 {
2459 errno = ERRNO_DATA4XX;
2460 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2461 }
2462 }
2463
2464 /* For LMTP, we get back a response for every RCPT command that we sent;
2465 some may be accepted and some rejected. For those that get a response, their
2466 status is fixed; any that are accepted have been handed over, even if later
2467 responses crash - at least, that's how I read RFC 2033.
2468
2469 If all went well, mark the recipient addresses as completed, record which
2470 host/IPaddress they were delivered to, and cut out RSET when sending another
2471 message down the same channel. Write the completed addresses to the journal
2472 now so that they are recorded in case there is a crash of hardware or
2473 software before the spool gets updated. Also record the final SMTP
2474 confirmation if needed (for SMTP only). */
2475
2476 if (ok)
2477 {
2478 int flag = '=';
2479 int delivery_time = (int)(time(NULL) - start_delivery_time);
2480 int len;
2481 uschar *conf = NULL;
2482 send_rset = FALSE;
2483
2484 /* Set up confirmation if needed - applies only to SMTP */
2485
2486 if (
2487 #ifdef DISABLE_EVENT
2488 LOGGING(smtp_confirmation) &&
2489 #endif
2490 !lmtp
2491 )
2492 {
2493 const uschar *s = string_printing(buffer);
2494 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2495 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2496 }
2497
2498 /* Process all transported addresses - for LMTP or PRDR, read a status for
2499 each one. */
2500
2501 for (addr = addrlist; addr != first_addr; addr = addr->next)
2502 {
2503 if (addr->transport_return != PENDING_OK) continue;
2504
2505 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2506 remaining addresses. Otherwise, it's a return code for just the one
2507 address. For temporary errors, add a retry item for the address so that
2508 it doesn't get tried again too soon. */
2509
2510 #ifndef DISABLE_PRDR
2511 if (lmtp || prdr_active)
2512 #else
2513 if (lmtp)
2514 #endif
2515 {
2516 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2517 ob->final_timeout))
2518 {
2519 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2520 addr->message = string_sprintf(
2521 #ifndef DISABLE_PRDR
2522 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2523 #else
2524 "LMTP error after %s: %s",
2525 #endif
2526 big_buffer, string_printing(buffer));
2527 setflag(addr, af_pass_message); /* Allow message to go to user */
2528 if (buffer[0] == '5')
2529 addr->transport_return = FAIL;
2530 else
2531 {
2532 errno = ERRNO_DATA4XX;
2533 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2534 addr->transport_return = DEFER;
2535 #ifndef DISABLE_PRDR
2536 if (!prdr_active)
2537 #endif
2538 retry_add_item(addr, addr->address_retry_key, 0);
2539 }
2540 continue;
2541 }
2542 completed_address = TRUE; /* NOW we can set this flag */
2543 if (LOGGING(smtp_confirmation))
2544 {
2545 const uschar *s = string_printing(buffer);
2546 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2547 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2548 }
2549 }
2550
2551 /* SMTP, or success return from LMTP for this address. Pass back the
2552 actual host that was used. */
2553
2554 addr->transport_return = OK;
2555 addr->more_errno = delivery_time;
2556 addr->host_used = host;
2557 addr->special_action = flag;
2558 addr->message = conf;
2559 #ifndef DISABLE_PRDR
2560 if (prdr_active) addr->flags |= af_prdr_used;
2561 #endif
2562 flag = '-';
2563
2564 #ifndef DISABLE_PRDR
2565 if (!prdr_active)
2566 #endif
2567 {
2568 /* Update the journal. For homonymic addresses, use the base address plus
2569 the transport name. See lots of comments in deliver.c about the reasons
2570 for the complications when homonyms are involved. Just carry on after
2571 write error, as it may prove possible to update the spool file later. */
2572
2573 if (testflag(addr, af_homonym))
2574 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2575 else
2576 sprintf(CS buffer, "%.500s\n", addr->unique);
2577
2578 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2579 len = Ustrlen(CS buffer);
2580 if (write(journal_fd, buffer, len) != len)
2581 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2582 "%s: %s", buffer, strerror(errno));
2583 }
2584 }
2585
2586 #ifndef DISABLE_PRDR
2587 if (prdr_active)
2588 {
2589 /* PRDR - get the final, overall response. For any non-success
2590 upgrade all the address statuses. */
2591 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2592 ob->final_timeout);
2593 if (!ok)
2594 {
2595 if(errno == 0 && buffer[0] == '4')
2596 {
2597 errno = ERRNO_DATA4XX;
2598 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2599 }
2600 for (addr = addrlist; addr != first_addr; addr = addr->next)
2601 if (buffer[0] == '5' || addr->transport_return == OK)
2602 addr->transport_return = PENDING_OK; /* allow set_errno action */
2603 goto RESPONSE_FAILED;
2604 }
2605
2606 /* Update the journal, or setup retry. */
2607 for (addr = addrlist; addr != first_addr; addr = addr->next)
2608 if (addr->transport_return == OK)
2609 {
2610 if (testflag(addr, af_homonym))
2611 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2612 else
2613 sprintf(CS buffer, "%.500s\n", addr->unique);
2614
2615 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2616 len = Ustrlen(CS buffer);
2617 if (write(journal_fd, buffer, len) != len)
2618 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2619 "%s: %s", buffer, strerror(errno));
2620 }
2621 else if (addr->transport_return == DEFER)
2622 retry_add_item(addr, addr->address_retry_key, -2);
2623 }
2624 #endif
2625
2626 /* Ensure the journal file is pushed out to disk. */
2627
2628 if (EXIMfsync(journal_fd) < 0)
2629 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2630 strerror(errno));
2631 }
2632 }
2633
2634
2635 /* Handle general (not specific to one address) failures here. The value of ok
2636 is used to skip over this code on the falling through case. A timeout causes a
2637 deferral. Other errors may defer or fail according to the response code, and
2638 may set up a special errno value, e.g. after connection chopped, which is
2639 assumed if errno == 0 and there is no text in the buffer. If control reaches
2640 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2641 the problem is not related to this specific message. */
2642
2643 if (!ok)
2644 {
2645 int code, set_rc;
2646 uschar * set_message;
2647
2648 RESPONSE_FAILED:
2649 {
2650 save_errno = errno;
2651 message = NULL;
2652 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2653 buffer, &code, &message, &pass_message);
2654 goto FAILED;
2655 }
2656
2657 SEND_FAILED:
2658 {
2659 save_errno = errno;
2660 code = '4';
2661 message = US string_sprintf("send() to %s [%s] failed: %s",
2662 host->name, host->address, strerror(save_errno));
2663 send_quit = FALSE;
2664 goto FAILED;
2665 }
2666
2667 /* This label is jumped to directly when a TLS negotiation has failed,
2668 or was not done for a host for which it is required. Values will be set
2669 in message and save_errno, and setting_up will always be true. Treat as
2670 a temporary error. */
2671
2672 #ifdef SUPPORT_TLS
2673 TLS_FAILED:
2674 code = '4';
2675 #endif
2676
2677 /* If the failure happened while setting up the call, see if the failure was
2678 a 5xx response (this will either be on connection, or following HELO - a 5xx
2679 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2680 never going to accept them. For other errors during setting up (timeouts or
2681 whatever), defer all addresses, and yield DEFER, so that the host is not
2682 tried again for a while. */
2683
2684 FAILED:
2685 ok = FALSE; /* For when reached by GOTO */
2686 set_message = message;
2687
2688 if (setting_up)
2689 {
2690 if (code == '5')
2691 set_rc = FAIL;
2692 else
2693 yield = set_rc = DEFER;
2694 }
2695
2696 /* We want to handle timeouts after MAIL or "." and loss of connection after
2697 "." specially. They can indicate a problem with the sender address or with
2698 the contents of the message rather than a real error on the connection. These
2699 cases are treated in the same way as a 4xx response. This next bit of code
2700 does the classification. */
2701
2702 else
2703 {
2704 BOOL message_error;
2705
2706 switch(save_errno)
2707 {
2708 #ifdef SUPPORT_I18N
2709 case ERRNO_UTF8_FWD:
2710 code = '5';
2711 /*FALLTHROUGH*/
2712 #endif
2713 case 0:
2714 case ERRNO_MAIL4XX:
2715 case ERRNO_DATA4XX:
2716 message_error = TRUE;
2717 break;
2718
2719 case ETIMEDOUT:
2720 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2721 Ustrncmp(smtp_command,"end ",4) == 0;
2722 break;
2723
2724 case ERRNO_SMTPCLOSED:
2725 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2726 break;
2727
2728 default:
2729 message_error = FALSE;
2730 break;
2731 }
2732
2733 /* Handle the cases that are treated as message errors. These are:
2734
2735 (a) negative response or timeout after MAIL
2736 (b) negative response after DATA
2737 (c) negative response or timeout or dropped connection after "."
2738 (d) utf8 support required and not offered
2739
2740 It won't be a negative response or timeout after RCPT, as that is dealt
2741 with separately above. The action in all cases is to set an appropriate
2742 error code for all the addresses, but to leave yield set to OK because the
2743 host itself has not failed. Of course, it might in practice have failed
2744 when we've had a timeout, but if so, we'll discover that at the next
2745 delivery attempt. For a temporary error, set the message_defer flag, and
2746 write to the logs for information if this is not the last host. The error
2747 for the last host will be logged as part of the address's log line. */
2748
2749 if (message_error)
2750 {
2751 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2752
2753 /* If there's an errno, the message contains just the identity of
2754 the host. */
2755
2756 if (code == '5')
2757 set_rc = FAIL;
2758 else /* Anything other than 5 is treated as temporary */
2759 {
2760 set_rc = DEFER;
2761 if (save_errno > 0)
2762 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2763 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2764 msglog_line(host, message);
2765 *message_defer = TRUE;
2766 }
2767 }
2768
2769 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2770 ".", or some other transportation error. We defer all addresses and yield
2771 DEFER, except for the case of failed add_headers expansion, or a transport
2772 filter failure, when the yield should be ERROR, to stop it trying other
2773 hosts. */
2774
2775 else
2776 {
2777 set_rc = DEFER;
2778 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2779 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2780 }
2781 }
2782
2783 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2784 #ifdef EXPERIMENTAL_DSN_INFO
2785 , smtp_greeting, helo_response
2786 #endif
2787 );
2788 }
2789
2790
2791 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2792 SMTP session tidily. However, if there were too many addresses to send in one
2793 message (indicated by first_addr being non-NULL) we want to carry on with the
2794 rest of them. Also, it is desirable to send more than one message down the SMTP
2795 connection if there are several waiting, provided we haven't already sent so
2796 many as to hit the configured limit. The function transport_check_waiting looks
2797 for a waiting message and returns its id. Then transport_pass_socket tries to
2798 set up a continued delivery by passing the socket on to another process. The
2799 variable send_rset is FALSE if a message has just been successfully transfered.
2800
2801 If we are already sending down a continued channel, there may be further
2802 addresses not yet delivered that are aimed at the same host, but which have not
2803 been passed in this run of the transport. In this case, continue_more will be
2804 true, and all we should do is send RSET if necessary, and return, leaving the
2805 channel open.
2806
2807 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2808 do not want to continue with other messages down the same channel, because that
2809 can lead to looping between two or more messages, all with the same,
2810 temporarily failing address(es). [The retry information isn't updated yet, so
2811 new processes keep on trying.] We probably also don't want to try more of this
2812 message's addresses either.
2813
2814 If we have started a TLS session, we have to end it before passing the
2815 connection to a new process. However, not all servers can handle this (Exim
2816 can), so we do not pass such a connection on if the host matches
2817 hosts_nopass_tls. */
2818
2819 DEBUG(D_transport)
2820 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2821 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2822 continue_more, yield, (first_addr == NULL)? "":"not ");
2823
2824 if (completed_address && ok && send_quit)
2825 {
2826 BOOL more;
2827 smtp_compare_t t_compare;
2828
2829 t_compare.tblock = tblock;
2830 t_compare.current_sender_address = sender_address;
2831
2832 if ( first_addr != NULL
2833 || continue_more
2834 || ( ( tls_out.active < 0
2835 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2836 )
2837 &&
2838 transport_check_waiting(tblock->name, host->name,
2839 tblock->connection_max_messages, new_message_id, &more,
2840 (oicf)smtp_are_same_identities, (void*)&t_compare)
2841 ) )
2842 {
2843 uschar *msg;
2844 BOOL pass_message;
2845
2846 if (send_rset)
2847 {
2848 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2849 {
2850 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2851 host->address, strerror(save_errno));
2852 send_quit = FALSE;
2853 }
2854 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2855 ob->command_timeout)))
2856 {
2857 int code;
2858 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2859 &pass_message);
2860 if (!send_quit)
2861 {
2862 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2863 host->name, host->address, msg);
2864 }
2865 }
2866 }
2867
2868 /* Either RSET was not needed, or it succeeded */
2869
2870 if (ok)
2871 {
2872 if (first_addr != NULL) /* More addresses still to be sent */
2873 { /* in this run of the transport */
2874 continue_sequence++; /* Causes * in logging */
2875 goto SEND_MESSAGE;
2876 }
2877 if (continue_more) return yield; /* More addresses for another run */
2878
2879 /* Pass the socket to a new Exim process. Before doing so, we must shut
2880 down TLS. Not all MTAs allow for the continuation of the SMTP session
2881 when TLS is shut down. We test for this by sending a new EHLO. If we
2882 don't get a good response, we don't attempt to pass the socket on. */
2883
2884 #ifdef SUPPORT_TLS
2885 if (tls_out.active >= 0)
2886 {
2887 tls_close(FALSE, TRUE);
2888 if (smtps)
2889 ok = FALSE;
2890 else
2891 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2892 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2893 ob->command_timeout);
2894 }
2895 #endif
2896
2897 /* If the socket is successfully passed, we musn't send QUIT (or
2898 indeed anything!) from here. */
2899
2900 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2901 propagate it from the initial
2902 */
2903 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2904 new_message_id, inblock.sock))
2905 {
2906 send_quit = FALSE;
2907 }
2908 }
2909
2910 /* If RSET failed and there are addresses left, they get deferred. */
2911
2912 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2913 #ifdef EXPERIMENTAL_DSN_INFO
2914 , smtp_greeting, helo_response
2915 #endif
2916 );
2917 }
2918 }
2919
2920 /* End off tidily with QUIT unless the connection has died or the socket has
2921 been passed to another process. There has been discussion on the net about what
2922 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2923 to wait for a response, but on the other hand, there isn't anything one can do
2924 with an error response, other than log it. Exim used to do that. However,
2925 further discussion suggested that it is positively advantageous not to wait for
2926 the response, but to close the session immediately. This is supposed to move
2927 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2928 load from the server. (Hosts that are both servers and clients may not see much
2929 difference, of course.) Further discussion indicated that this was safe to do
2930 on Unix systems which have decent implementations of TCP/IP that leave the
2931 connection around for a while (TIME_WAIT) after the application has gone away.
2932 This enables the response sent by the server to be properly ACKed rather than
2933 timed out, as can happen on broken TCP/IP implementations on other OS.
2934
2935 This change is being made on 31-Jul-98. After over a year of trouble-free
2936 operation, the old commented-out code was removed on 17-Sep-99. */
2937
2938 SEND_QUIT:
2939 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2940
2941 END_OFF:
2942
2943 #ifdef SUPPORT_TLS
2944 tls_close(FALSE, TRUE);
2945 #endif
2946
2947 /* Close the socket, and return the appropriate value, first setting
2948 works because the NULL setting is passed back to the calling process, and
2949 remote_max_parallel is forced to 1 when delivering over an existing connection,
2950
2951 If all went well and continue_more is set, we shouldn't actually get here if
2952 there are further addresses, as the return above will be taken. However,
2953 writing RSET might have failed, or there may be other addresses whose hosts are
2954 specified in the transports, and therefore not visible at top level, in which
2955 case continue_more won't get set. */
2956
2957 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2958 (void)close(inblock.sock);
2959
2960 #ifndef DISABLE_EVENT
2961 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2962 #endif
2963
2964 continue_transport = NULL;
2965 continue_hostname = NULL;
2966 return yield;
2967 }
2968
2969
2970
2971
2972 /*************************************************
2973 * Closedown entry point *
2974 *************************************************/
2975
2976 /* This function is called when exim is passed an open smtp channel
2977 from another incarnation, but the message which it has been asked
2978 to deliver no longer exists. The channel is on stdin.
2979
2980 We might do fancy things like looking for another message to send down
2981 the channel, but if the one we sought has gone, it has probably been
2982 delivered by some other process that itself will seek further messages,
2983 so just close down our connection.
2984
2985 Argument: pointer to the transport instance block
2986 Returns: nothing
2987 */
2988
2989 void
2990 smtp_transport_closedown(transport_instance *tblock)
2991 {
2992 smtp_transport_options_block *ob =
2993 (smtp_transport_options_block *)(tblock->options_block);
2994 smtp_inblock inblock;
2995 smtp_outblock outblock;
2996 uschar buffer[256];
2997 uschar inbuffer[4096];
2998 uschar outbuffer[16];
2999
3000 inblock.sock = fileno(stdin);
3001 inblock.buffer = inbuffer;
3002 inblock.buffersize = sizeof(inbuffer);
3003 inblock.ptr = inbuffer;
3004 inblock.ptrend = inbuffer;
3005
3006 outblock.sock = inblock.sock;
3007 outblock.buffersize = sizeof(outbuffer);
3008 outblock.buffer = outbuffer;
3009 outblock.ptr = outbuffer;
3010 outblock.cmd_count = 0;
3011 outblock.authenticating = FALSE;
3012
3013 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3014 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3015 ob->command_timeout);
3016 (void)close(inblock.sock);
3017 }
3018
3019
3020
3021 /*************************************************
3022 * Prepare addresses for delivery *
3023 *************************************************/
3024
3025 /* This function is called to flush out error settings from previous delivery
3026 attempts to other hosts. It also records whether we got here via an MX record
3027 or not in the more_errno field of the address. We are interested only in
3028 addresses that are still marked DEFER - others may have got delivered to a
3029 previously considered IP address. Set their status to PENDING_DEFER to indicate
3030 which ones are relevant this time.
3031
3032 Arguments:
3033 addrlist the list of addresses
3034 host the host we are delivering to
3035
3036 Returns: the first address for this delivery
3037 */
3038
3039 static address_item *
3040 prepare_addresses(address_item *addrlist, host_item *host)
3041 {
3042 address_item *first_addr = NULL;
3043 address_item *addr;
3044 for (addr = addrlist; addr != NULL; addr = addr->next)
3045 if (addr->transport_return == DEFER)
3046 {
3047 if (first_addr == NULL) first_addr = addr;
3048 addr->transport_return = PENDING_DEFER;
3049 addr->basic_errno = 0;
3050 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3051 addr->message = NULL;
3052 #ifdef SUPPORT_TLS
3053 addr->cipher = NULL;
3054 addr->ourcert = NULL;
3055 addr->peercert = NULL;
3056 addr->peerdn = NULL;
3057 addr->ocsp = OCSP_NOT_REQ;
3058 #endif
3059 #ifdef EXPERIMENTAL_DSN_INFO
3060 addr->smtp_greeting = NULL;
3061 addr->helo_response = NULL;
3062 #endif
3063 }
3064 return first_addr;
3065 }
3066
3067
3068
3069 /*************************************************
3070 * Main entry point *
3071 *************************************************/
3072
3073 /* See local README for interface details. As this is a remote transport, it is
3074 given a chain of addresses to be delivered in one connection, if possible. It
3075 always returns TRUE, indicating that each address has its own independent
3076 status set, except if there is a setting up problem, in which case it returns
3077 FALSE. */
3078
3079 BOOL
3080 smtp_transport_entry(
3081 transport_instance *tblock, /* data for this instantiation */
3082 address_item *addrlist) /* addresses we are working on */
3083 {
3084 int cutoff_retry;
3085 int port;
3086 int hosts_defer = 0;
3087 int hosts_fail = 0;
3088 int hosts_looked_up = 0;
3089 int hosts_retry = 0;
3090 int hosts_serial = 0;
3091 int hosts_total = 0;
3092 int total_hosts_tried = 0;
3093 address_item *addr;
3094 BOOL expired = TRUE;
3095 BOOL continuing = continue_hostname != NULL;
3096 uschar *expanded_hosts = NULL;
3097 uschar *pistring;
3098 uschar *tid = string_sprintf("%s transport", tblock->name);
3099 smtp_transport_options_block *ob =
3100 (smtp_transport_options_block *)(tblock->options_block);
3101 host_item *hostlist = addrlist->host_list;
3102 host_item *host = NULL;
3103
3104 DEBUG(D_transport)
3105 {
3106 debug_printf("%s transport entered\n", tblock->name);
3107 for (addr = addrlist; addr != NULL; addr = addr->next)
3108 debug_printf(" %s\n", addr->address);
3109 if (continuing) debug_printf("already connected to %s [%s]\n",
3110 continue_hostname, continue_host_address);
3111 }
3112
3113 /* Set the flag requesting that these hosts be added to the waiting
3114 database if the delivery fails temporarily or if we are running with
3115 queue_smtp or a 2-stage queue run. This gets unset for certain
3116 kinds of error, typically those that are specific to the message. */
3117
3118 update_waiting = TRUE;
3119
3120 /* If a host list is not defined for the addresses - they must all have the
3121 same one in order to be passed to a single transport - or if the transport has
3122 a host list with hosts_override set, use the host list supplied with the
3123 transport. It is an error for this not to exist. */
3124
3125 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3126 {
3127 if (ob->hosts == NULL)
3128 {
3129 addrlist->message = string_sprintf("%s transport called with no hosts set",
3130 tblock->name);
3131 addrlist->transport_return = PANIC;
3132 return FALSE; /* Only top address has status */
3133 }
3134
3135 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3136 ob->hosts);
3137
3138 /* If the transport's host list contains no '$' characters, and we are not
3139 randomizing, it is fixed and therefore a chain of hosts can be built once
3140 and for all, and remembered for subsequent use by other calls to this
3141 transport. If, on the other hand, the host list does contain '$', or we are
3142 randomizing its order, we have to rebuild it each time. In the fixed case,
3143 as the hosts string will never be used again, it doesn't matter that we
3144 replace all the : characters with zeros. */
3145
3146 if (ob->hostlist == NULL)
3147 {
3148 uschar *s = ob->hosts;
3149
3150 if (Ustrchr(s, '$') != NULL)
3151 {
3152 if (!(expanded_hosts = expand_string(s)))
3153 {
3154 addrlist->message = string_sprintf("failed to expand list of hosts "
3155 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3156 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3157 return FALSE; /* Only top address has status */
3158 }
3159 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3160 "\"%s\"\n", s, expanded_hosts);
3161 s = expanded_hosts;
3162 }
3163 else
3164 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3165
3166 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3167
3168 /* Check that the expansion yielded something useful. */
3169 if (hostlist == NULL)
3170 {
3171 addrlist->message =
3172 string_sprintf("%s transport has empty hosts setting", tblock->name);
3173 addrlist->transport_return = PANIC;
3174 return FALSE; /* Only top address has status */
3175 }
3176
3177 /* If there was no expansion of hosts, save the host list for
3178 next time. */
3179
3180 if (!expanded_hosts) ob->hostlist = hostlist;
3181 }
3182
3183 /* This is not the first time this transport has been run in this delivery;
3184 the host list was built previously. */
3185
3186 else
3187 hostlist = ob->hostlist;
3188 }
3189
3190 /* The host list was supplied with the address. If hosts_randomize is set, we
3191 must sort it into a random order if it did not come from MX records and has not
3192 already been randomized (but don't bother if continuing down an existing
3193 connection). */
3194
3195 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3196 {
3197 host_item *newlist = NULL;
3198 while (hostlist != NULL)
3199 {
3200 host_item *h = hostlist;
3201 hostlist = hostlist->next;
3202
3203 h->sort_key = random_number(100);
3204
3205 if (newlist == NULL)
3206 {
3207 h->next = NULL;
3208 newlist = h;
3209 }
3210 else if (h->sort_key < newlist->sort_key)
3211 {
3212 h->next = newlist;
3213 newlist = h;
3214 }
3215 else
3216 {
3217 host_item *hh = newlist;
3218 while (hh->next != NULL)
3219 {
3220 if (h->sort_key < hh->next->sort_key) break;
3221 hh = hh->next;
3222 }
3223 h->next = hh->next;
3224 hh->next = h;
3225 }
3226 }
3227
3228 hostlist = addrlist->host_list = newlist;
3229 }
3230
3231 /* Sort out the default port. */
3232
3233 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3234
3235 /* For each host-plus-IP-address on the list:
3236
3237 . If this is a continued delivery and the host isn't the one with the
3238 current connection, skip.
3239
3240 . If the status is unusable (i.e. previously failed or retry checked), skip.
3241
3242 . If no IP address set, get the address, either by turning the name into
3243 an address, calling gethostbyname if gethostbyname is on, or by calling
3244 the DNS. The DNS may yield multiple addresses, in which case insert the
3245 extra ones into the list.
3246
3247 . Get the retry data if not previously obtained for this address and set the
3248 field which remembers the state of this address. Skip if the retry time is
3249 not reached. If not, remember whether retry data was found. The retry string
3250 contains both the name and the IP address.
3251
3252 . Scan the list of addresses and mark those whose status is DEFER as
3253 PENDING_DEFER. These are the only ones that will be processed in this cycle
3254 of the hosts loop.
3255
3256 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3257 Some addresses may be successfully delivered, others may fail, and yet
3258 others may get temporary errors and so get marked DEFER.
3259
3260 . The return from the delivery attempt is OK if a connection was made and a
3261 valid SMTP dialogue was completed. Otherwise it is DEFER.
3262
3263 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3264
3265 . If fail to connect, or other defer state, add a retry item.
3266
3267 . If there are any addresses whose status is still DEFER, carry on to the
3268 next host/IPaddress, unless we have tried the number of hosts given
3269 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3270 there is some fancy logic for hosts_max_try that means its limit can be
3271 overstepped in some circumstances.
3272
3273 If we get to the end of the list, all hosts have deferred at least one address,
3274 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3275 delivery attempt to those hosts whose last try was before the arrival time of
3276 the current message. To cope with this, we have to go round the loop a second
3277 time. After that, set the status and error data for any addresses that haven't
3278 had it set already. */
3279
3280 for (cutoff_retry = 0; expired &&
3281 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3282 cutoff_retry++)
3283 {
3284 host_item *nexthost = NULL;
3285 int unexpired_hosts_tried = 0;
3286
3287 for (host = hostlist;
3288 host != NULL &&
3289 unexpired_hosts_tried < ob->hosts_max_try &&
3290 total_hosts_tried < ob->hosts_max_try_hardlimit;
3291 host = nexthost)
3292 {
3293 int rc;
3294 int host_af;
3295 uschar *rs;
3296 BOOL serialized = FALSE;
3297 BOOL host_is_expired = FALSE;
3298 BOOL message_defer = FALSE;
3299 BOOL some_deferred = FALSE;
3300 address_item *first_addr = NULL;
3301 uschar *interface = NULL;
3302 uschar *retry_host_key = NULL;
3303 uschar *retry_message_key = NULL;
3304 uschar *serialize_key = NULL;
3305
3306 /* Default next host is next host. :-) But this can vary if the
3307 hosts_max_try limit is hit (see below). It may also be reset if a host
3308 address is looked up here (in case the host was multihomed). */
3309
3310 nexthost = host->next;
3311
3312 /* If the address hasn't yet been obtained from the host name, look it up
3313 now, unless the host is already marked as unusable. If it is marked as
3314 unusable, it means that the router was unable to find its IP address (in
3315 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3316 the lookup failed last time. We don't get this far if *all* MX records
3317 point to non-existent hosts; that is treated as a hard error.
3318
3319 We can just skip this host entirely. When the hosts came from the router,
3320 the address will timeout based on the other host(s); when the address is
3321 looked up below, there is an explicit retry record added.
3322
3323 Note that we mustn't skip unusable hosts if the address is not unset; they
3324 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3325
3326 if (host->address == NULL)
3327 {
3328 int new_port, flags;
3329 host_item *hh;
3330
3331 if (host->status >= hstatus_unusable)
3332 {
3333 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3334 host->name);
3335 continue;
3336 }
3337
3338 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3339
3340 /* The host name is permitted to have an attached port. Find it, and
3341 strip it from the name. Just remember it for now. */
3342
3343 new_port = host_item_get_port(host);
3344
3345 /* Count hosts looked up */
3346
3347 hosts_looked_up++;
3348
3349 /* Find by name if so configured, or if it's an IP address. We don't
3350 just copy the IP address, because we need the test-for-local to happen. */
3351
3352 flags = HOST_FIND_BY_A;
3353 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3354 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3355
3356 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3357 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3358 else
3359 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3360 &ob->dnssec, /* domains for request/require */
3361 NULL, NULL);
3362
3363 /* Update the host (and any additional blocks, resulting from
3364 multihoming) with a host-specific port, if any. */
3365
3366 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3367
3368 /* Failure to find the host at this time (usually DNS temporary failure)
3369 is really a kind of routing failure rather than a transport failure.
3370 Therefore we add a retry item of the routing kind, not to stop us trying
3371 to look this name up here again, but to ensure the address gets timed
3372 out if the failures go on long enough. A complete failure at this point
3373 commonly points to a configuration error, but the best action is still
3374 to carry on for the next host. */
3375
3376 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3377 {
3378 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3379 expired = FALSE;
3380 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3381 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3382 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3383 host->status = hstatus_unusable;
3384
3385 for (addr = addrlist; addr != NULL; addr = addr->next)
3386 {
3387 if (addr->transport_return != DEFER) continue;
3388 addr->basic_errno = ERRNO_UNKNOWNHOST;
3389 addr->message =
3390 string_sprintf("failed to lookup IP address for %s", host->name);
3391 }
3392 continue;
3393 }
3394
3395 /* If the host is actually the local host, we may have a problem, or
3396 there may be some cunning configuration going on. In the problem case,
3397 log things and give up. The default transport status is already DEFER. */
3398
3399 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3400 {
3401 for (addr = addrlist; addr != NULL; addr = addr->next)
3402 {
3403 addr->basic_errno = 0;
3404 addr->message = string_sprintf("%s transport found host %s to be "
3405 "local", tblock->name, host->name);
3406 }
3407 goto END_TRANSPORT;
3408 }
3409 } /* End of block for IP address lookup */
3410
3411 /* If this is a continued delivery, we are interested only in the host
3412 which matches the name of the existing open channel. The check is put
3413 here after the local host lookup, in case the name gets expanded as a
3414 result of the lookup. Set expired FALSE, to save the outer loop executing
3415 twice. */
3416
3417 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3418 Ustrcmp(continue_host_address, host->address) != 0))
3419 {
3420 expired = FALSE;
3421 continue; /* With next host */
3422 }
3423
3424 /* Reset the default next host in case a multihomed host whose addresses
3425 are not looked up till just above added to the host list. */
3426
3427 nexthost = host->next;
3428
3429 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3430 domain is in queue_smtp_domains, we don't actually want to attempt any
3431 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3432 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3433 were not in it. We don't want to hold up all SMTP deliveries! Except when
3434 doing a two-stage queue run, don't do this if forcing. */
3435
3436 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3437 match_isinlist(addrlist->domain,
3438 (const uschar **)&queue_smtp_domains, 0,
3439 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3440 {
3441 expired = FALSE;
3442 for (addr = addrlist; addr != NULL; addr = addr->next)
3443 {
3444 if (addr->transport_return != DEFER) continue;
3445 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3446 }
3447 continue; /* With next host */
3448 }
3449
3450 /* Count hosts being considered - purely for an intelligent comment
3451 if none are usable. */
3452
3453 hosts_total++;
3454
3455 /* Set $host and $host address now in case they are needed for the
3456 interface expansion or the serialize_hosts check; they remain set if an
3457 actual delivery happens. */
3458
3459 deliver_host = host->name;
3460 deliver_host_address = host->address;
3461 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3462 : host->dnssec == DS_NO ? US"no"
3463 : US"";
3464
3465 /* Set up a string for adding to the retry key if the port number is not
3466 the standard SMTP port. A host may have its own port setting that overrides
3467 the default. */
3468
3469 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3470 port : host->port);
3471 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3472
3473 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3474 string is set, even if constant (as different transports can have different
3475 constant settings), we must add it to the key that is used for retries,
3476 because connections to the same host from a different interface should be
3477 treated separately. */
3478
3479 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3480 if ((rs = ob->interface) && *rs)
3481 {
3482 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3483 return FALSE;
3484 pistring = string_sprintf("%s/%s", pistring, interface);
3485 }
3486
3487 /* The first time round the outer loop, check the status of the host by
3488 inspecting the retry data. The second time round, we are interested only
3489 in expired hosts that haven't been tried since this message arrived. */
3490
3491 if (cutoff_retry == 0)
3492 {
3493 BOOL incl_ip;
3494 /* Ensure the status of the address is set by checking retry data if
3495 necessary. There may be host-specific retry data (applicable to all
3496 messages) and also data for retries of a specific message at this host.
3497 If either of these retry records are actually read, the keys used are
3498 returned to save recomputing them later. */
3499
3500 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3501 US"retry_include_ip_address", ob->retry_include_ip_address,
3502 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3503 continue; /* with next host */
3504
3505 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3506 incl_ip, &retry_host_key, &retry_message_key);
3507
3508 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3509 (host->address == NULL)? US"" : host->address, pistring,
3510 (host->status == hstatus_usable)? "usable" :
3511 (host->status == hstatus_unusable)? "unusable" :
3512 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3513
3514 /* Skip this address if not usable at this time, noting if it wasn't
3515 actually expired, both locally and in the address. */
3516
3517 switch (host->status)
3518 {
3519 case hstatus_unusable:
3520 expired = FALSE;
3521 setflag(addrlist, af_retry_skipped);
3522 /* Fall through */
3523
3524 case hstatus_unusable_expired:
3525 switch (host->why)
3526 {
3527 case hwhy_retry: hosts_retry++; break;
3528 case hwhy_failed: hosts_fail++; break;
3529 case hwhy_deferred: hosts_defer++; break;
3530 }
3531
3532 /* If there was a retry message key, implying that previously there
3533 was a message-specific defer, we don't want to update the list of
3534 messages waiting for these hosts. */
3535
3536 if (retry_message_key != NULL) update_waiting = FALSE;
3537 continue; /* With the next host or IP address */
3538 }
3539 }
3540
3541 /* Second time round the loop: if the address is set but expired, and
3542 the message is newer than the last try, let it through. */
3543
3544 else
3545 {
3546 if (host->address == NULL ||
3547 host->status != hstatus_unusable_expired ||
3548 host->last_try > received_time)
3549 continue;
3550 DEBUG(D_transport)
3551 debug_printf("trying expired host %s [%s]%s\n",
3552 host->name, host->address, pistring);
3553 host_is_expired = TRUE;
3554 }
3555
3556 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3557 it remains TRUE only if all hosts are expired and none are actually tried.
3558 */
3559
3560 expired = FALSE;
3561
3562 /* If this host is listed as one to which access must be serialized,
3563 see if another Exim process has a connection to it, and if so, skip
3564 this host. If not, update the database to record our connection to it
3565 and remember this for later deletion. Do not do any of this if we are
3566 sending the message down a pre-existing connection. */
3567
3568 if (!continuing &&
3569 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3570 {
3571 serialize_key = string_sprintf("host-serialize-%s", host->name);
3572 if (!enq_start(serialize_key, 1))
3573 {
3574 DEBUG(D_transport)
3575 debug_printf("skipping host %s because another Exim process "
3576 "is connected to it\n", host->name);
3577 hosts_serial++;
3578 continue;
3579 }
3580 serialized = TRUE;
3581 }
3582
3583 /* OK, we have an IP address that is not waiting for its retry time to
3584 arrive (it might be expired) OR (second time round the loop) we have an
3585 expired host that hasn't been tried since the message arrived. Have a go
3586 at delivering the message to it. First prepare the addresses by flushing
3587 out the result of previous attempts, and finding the first address that
3588 is still to be delivered. */
3589
3590 first_addr = prepare_addresses(addrlist, host);
3591
3592 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3593 message_id, host->name, host->address, addrlist->address,
3594 (addrlist->next == NULL)? "" : ", ...");
3595
3596 set_process_info("delivering %s to %s [%s] (%s%s)",
3597 message_id, host->name, host->address, addrlist->address,
3598 (addrlist->next == NULL)? "" : ", ...");
3599
3600 /* This is not for real; don't do the delivery. If there are
3601 any remaining hosts, list them. */
3602
3603 if (dont_deliver)
3604 {
3605 host_item *host2;
3606 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3607 for (addr = addrlist; addr != NULL; addr = addr->next)
3608 {
3609 addr->host_used = host;
3610 addr->special_action = '*';
3611 addr->message = US"delivery bypassed by -N option";
3612 }
3613 DEBUG(D_transport)
3614 {
3615 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3616 "*** host and remaining hosts:\n", tblock->name);
3617 for (host2 = host; host2 != NULL; host2 = host2->next)
3618 debug_printf(" %s [%s]\n", host2->name,
3619 (host2->address == NULL)? US"unset" : host2->address);
3620 }
3621 rc = OK;
3622 }
3623
3624 /* This is for real. If the host is expired, we don't count it for
3625 hosts_max_retry. This ensures that all hosts must expire before an address
3626 is timed out, unless hosts_max_try_hardlimit (which protects against
3627 lunatic DNS configurations) is reached.
3628
3629 If the host is not expired and we are about to hit the hosts_max_retry
3630 limit, check to see if there is a subsequent hosts with a different MX
3631 value. If so, make that the next host, and don't count this one. This is a
3632 heuristic to make sure that different MXs do get tried. With a normal kind
3633 of retry rule, they would get tried anyway when the earlier hosts were
3634 delayed, but if the domain has a "retry every time" type of rule - as is
3635 often used for the the very large ISPs, that won't happen. */
3636
3637 else
3638 {
3639 host_item * thost;
3640 /* Make a copy of the host if it is local to this invocation
3641 of the transport. */
3642
3643 if (expanded_hosts)
3644 {
3645 thost = store_get(sizeof(host_item));
3646 *thost = *host;
3647 thost->name = string_copy(host->name);
3648 thost->address = string_copy(host->address);
3649 }
3650 else
3651 thost = host;
3652
3653 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3654 {
3655 host_item *h;
3656 DEBUG(D_transport)
3657 debug_printf("hosts_max_try limit reached with this host\n");
3658 for (h = host; h; h = h->next) if (h->mx != host->mx)
3659 {
3660 nexthost = h;
3661 unexpired_hosts_tried--;
3662 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3663 "and will be tried\n");
3664 break;
3665 }
3666 }
3667
3668 /* Attempt the delivery. */
3669
3670 total_hosts_tried++;
3671 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3672 &message_defer, FALSE);
3673
3674 /* Yield is one of:
3675 OK => connection made, each address contains its result;
3676 message_defer is set for message-specific defers (when all
3677 recipients are marked defer)
3678 DEFER => there was a non-message-specific delivery problem;
3679 ERROR => there was a problem setting up the arguments for a filter,
3680 or there was a problem with expanding added headers
3681 */
3682
3683 /* If the result is not OK, there was a non-message-specific problem.
3684 If the result is DEFER, we need to write to the logs saying what happened
3685 for this particular host, except in the case of authentication and TLS
3686 failures, where the log has already been written. If all hosts defer a
3687 general message is written at the end. */
3688
3689 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3690 first_addr->basic_errno != ERRNO_TLSFAILURE)
3691 write_logs(first_addr, host);
3692
3693 #ifndef DISABLE_EVENT
3694 if (rc == DEFER)
3695 deferred_event_raise(first_addr, host);
3696 #endif
3697
3698 /* If STARTTLS was accepted, but there was a failure in setting up the
3699 TLS session (usually a certificate screwup), and the host is not in
3700 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3701 TLS forcibly turned off. We have to start from scratch with a new SMTP
3702 connection. That's why the retry is done from here, not from within
3703 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3704 session, so the in-clear transmission after those errors, if permitted,
3705 happens inside smtp_deliver().] */
3706
3707 #ifdef SUPPORT_TLS
3708 if ( rc == DEFER
3709 && first_addr->basic_errno == ERRNO_TLSFAILURE
3710 && ob->tls_tempfail_tryclear
3711 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3712 )
3713 {
3714 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3715 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3716 first_addr = prepare_addresses(addrlist, host);
3717 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3718 &message_defer, TRUE);
3719 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3720 write_logs(first_addr, host);
3721 # ifndef DISABLE_EVENT
3722 if (rc == DEFER)
3723 deferred_event_raise(first_addr, host);
3724 # endif
3725 }
3726 #endif /*SUPPORT_TLS*/
3727 }
3728
3729 /* Delivery attempt finished */
3730
3731 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3732 US"ERROR" : US"?";
3733
3734 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3735 message_id, host->name, host->address, addrlist->address,
3736 (addrlist->next == NULL)? "" : " (& others)", rs);
3737
3738 /* Release serialization if set up */
3739
3740 if (serialized) enq_end(serialize_key);
3741
3742 /* If the result is DEFER, or if a host retry record is known to exist, we
3743 need to add an item to the retry chain for updating the retry database
3744 at the end of delivery. We only need to add the item to the top address,
3745 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3746 for any other delivery attempts using the same address. (It is copied into
3747 the unusable tree at the outer level, so even if different address blocks
3748 contain the same address, it still won't get tried again.) */
3749
3750 if (rc == DEFER || retry_host_key != NULL)
3751 {
3752 int delete_flag = (rc != DEFER)? rf_delete : 0;
3753 if (retry_host_key == NULL)
3754 {
3755 BOOL incl_ip;
3756 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3757 US"retry_include_ip_address", ob->retry_include_ip_address,
3758 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3759 incl_ip = TRUE; /* error; use most-specific retry record */
3760
3761 retry_host_key = incl_ip ?
3762 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3763 string_sprintf("T:%S%s", host->name, pistring);
3764 }
3765
3766 /* If a delivery of another message over an existing SMTP connection
3767 yields DEFER, we do NOT set up retry data for the host. This covers the
3768 case when there are delays in routing the addresses in the second message
3769 that are so long that the server times out. This is alleviated by not
3770 routing addresses that previously had routing defers when handling an
3771 existing connection, but even so, this case may occur (e.g. if a
3772 previously happily routed address starts giving routing defers). If the
3773 host is genuinely down, another non-continued message delivery will
3774 notice it soon enough. */
3775
3776 if (delete_flag != 0 || !continuing)
3777 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3778
3779 /* We may have tried an expired host, if its retry time has come; ensure
3780 the status reflects the expiry for the benefit of any other addresses. */
3781
3782 if (rc == DEFER)
3783 {
3784 host->status = (host_is_expired)?
3785 hstatus_unusable_expired : hstatus_unusable;
3786 host->why = hwhy_deferred;
3787 }
3788 }
3789
3790 /* If message_defer is set (host was OK, but every recipient got deferred
3791 because of some message-specific problem), or if that had happened
3792 previously so that a message retry key exists, add an appropriate item
3793 to the retry chain. Note that if there was a message defer but now there is
3794 a host defer, the message defer record gets deleted. That seems perfectly
3795 reasonable. Also, stop the message from being remembered as waiting
3796 for specific hosts. */
3797
3798 if (message_defer || retry_message_key != NULL)
3799 {
3800 int delete_flag = message_defer? 0 : rf_delete;
3801 if (retry_message_key == NULL)
3802 {
3803 BOOL incl_ip;
3804 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3805 US"retry_include_ip_address", ob->retry_include_ip_address,
3806 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3807 incl_ip = TRUE; /* error; use most-specific retry record */
3808
3809 retry_message_key = incl_ip ?
3810 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3811 message_id) :
3812 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3813 }
3814 retry_add_item(addrlist, retry_message_key,
3815 rf_message | rf_host | delete_flag);
3816 update_waiting = FALSE;
3817 }
3818
3819 /* Any return other than DEFER (that is, OK or ERROR) means that the
3820 addresses have got their final statuses filled in for this host. In the OK
3821 case, see if any of them are deferred. */
3822
3823 if (rc == OK)
3824 for (addr = addrlist; addr; addr = addr->next)
3825 if (addr->transport_return == DEFER)
3826 {
3827 some_deferred = TRUE;
3828 break;
3829 }
3830
3831 /* If no addresses deferred or the result was ERROR, return. We do this for
3832 ERROR because a failing filter set-up or add_headers expansion is likely to
3833 fail for any host we try. */
3834
3835 if (rc == ERROR || (rc == OK && !some_deferred))
3836 {
3837 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3838 return TRUE; /* Each address has its status */
3839 }
3840
3841 /* If the result was DEFER or some individual addresses deferred, let
3842 the loop run to try other hosts with the deferred addresses, except for the
3843 case when we were trying to deliver down an existing channel and failed.
3844 Don't try any other hosts in this case. */
3845
3846 if (continuing) break;
3847
3848 /* If the whole delivery, or some individual addresses, were deferred and
3849 there are more hosts that could be tried, do not count this host towards
3850 the hosts_max_try limit if the age of the message is greater than the
3851 maximum retry time for this host. This means we may try try all hosts,
3852 ignoring the limit, when messages have been around for some time. This is
3853 important because if we don't try all hosts, the address will never time
3854 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3855
3856 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3857 {
3858 BOOL timedout;
3859 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3860
3861 if (retry != NULL && retry->rules != NULL)
3862 {
3863 retry_rule *last_rule;
3864 for (last_rule = retry->rules;
3865 last_rule->next != NULL;
3866 last_rule = last_rule->next);
3867 timedout = time(NULL) - received_time > last_rule->timeout;
3868 }
3869 else timedout = TRUE; /* No rule => timed out */
3870
3871 if (timedout)
3872 {
3873 unexpired_hosts_tried--;
3874 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3875 "hosts_max_try (message older than host's retry time)\n");
3876 }
3877 }
3878 } /* End of loop for trying multiple hosts. */
3879
3880 /* This is the end of the loop that repeats iff expired is TRUE and
3881 ob->delay_after_cutoff is FALSE. The second time round we will
3882 try those hosts that haven't been tried since the message arrived. */
3883
3884 DEBUG(D_transport)
3885 {
3886 debug_printf("all IP addresses skipped or deferred at least one address\n");
3887 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3888 debug_printf("retrying IP addresses not tried since message arrived\n");
3889 }
3890 }
3891
3892
3893 /* Get here if all IP addresses are skipped or defer at least one address. In
3894 MUA wrapper mode, this will happen only for connection or other non-message-
3895 specific failures. Force the delivery status for all addresses to FAIL. */
3896
3897 if (mua_wrapper)
3898 {
3899 for (addr = addrlist; addr != NULL; addr = addr->next)
3900 addr->transport_return = FAIL;
3901 goto END_TRANSPORT;
3902 }
3903
3904 /* In the normal, non-wrapper case, add a standard message to each deferred
3905 address if there hasn't been an error, that is, if it hasn't actually been
3906 tried this time. The variable "expired" will be FALSE if any deliveries were
3907 actually tried, or if there was at least one host that was not expired. That
3908 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3909 a delivery has been tried, an error code will be set, and the failing of the
3910 message is handled by the retry code later.
3911
3912 If queue_smtp is set, or this transport was called to send a subsequent message
3913 down an existing TCP/IP connection, and something caused the host not to be
3914 found, we end up here, but can detect these cases and handle them specially. */
3915
3916 for (addr = addrlist; addr != NULL; addr = addr->next)
3917 {
3918 /* If host is not NULL, it means that we stopped processing the host list
3919 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3920 means we need to behave as if some hosts were skipped because their retry
3921 time had not come. Specifically, this prevents the address from timing out.
3922 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3923 hosts were tried. */
3924
3925 if (host != NULL)
3926 {
3927 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3928 {
3929 DEBUG(D_transport)
3930 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3931 "hosts were tried\n");
3932 }
3933 else
3934 {
3935 DEBUG(D_transport)
3936 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3937 setflag(addr, af_retry_skipped);
3938 }
3939 }
3940
3941 if (queue_smtp) /* no deliveries attempted */
3942 {
3943 addr->transport_return = DEFER;
3944 addr->basic_errno = 0;
3945 addr->message = US"SMTP delivery explicitly queued";
3946 }
3947
3948 else if (addr->transport_return == DEFER &&
3949 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3950 addr->message == NULL)
3951 {
3952 addr->basic_errno = ERRNO_HRETRY;
3953 if (continue_hostname != NULL)
3954 {
3955 addr->message = US"no host found for existing SMTP connection";
3956 }
3957 else if (expired)
3958 {
3959 setflag(addr, af_pass_message); /* This is not a security risk */
3960 addr->message = ob->delay_after_cutoff
3961 ? US"retry time not reached for any host after a long failure period"
3962 : US"all hosts have been failing for a long time and were last tried "
3963 "after this message arrived";
3964
3965 /* If we are already using fallback hosts, or there are no fallback hosts
3966 defined, convert the result to FAIL to cause a bounce. */
3967
3968 if (addr->host_list == addr->fallback_hosts ||
3969 addr->fallback_hosts == NULL)
3970 addr->transport_return = FAIL;
3971 }
3972 else
3973 {
3974 const char * s;
3975 if (hosts_retry == hosts_total)
3976 s = "retry time not reached for any host%s";
3977 else if (hosts_fail == hosts_total)
3978 s = "all host address lookups%s failed permanently";
3979 else if (hosts_defer == hosts_total)
3980 s = "all host address lookups%s failed temporarily";
3981 else if (hosts_serial == hosts_total)
3982 s = "connection limit reached for all hosts%s";
3983 else if (hosts_fail+hosts_defer == hosts_total)
3984 s = "all host address lookups%s failed";
3985 else
3986 s = "some host address lookups failed and retry time "
3987 "not reached for other hosts or connection limit reached%s";
3988
3989 addr->message = string_sprintf(s,
3990 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3991 }
3992 }
3993 }
3994
3995 /* Update the database which keeps information about which messages are waiting
3996 for which hosts to become available. For some message-specific errors, the
3997 update_waiting flag is turned off because we don't want follow-on deliveries in
3998 those cases. If this transport instance is explicitly limited to one message
3999 per connection then follow-on deliveries are not possible and there's no need
4000 to create/update the per-transport wait-<transport_name> database. */
4001
4002 if (update_waiting && tblock->connection_max_messages != 1)
4003 transport_update_waiting(hostlist, tblock->name);
4004
4005 END_TRANSPORT:
4006
4007 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4008
4009 return TRUE; /* Each address has its status */
4010 }
4011
4012 /* vi: aw ai sw=2
4013 */
4014 /* End of transport/smtp.c */
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