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Delivery: quieten smtp transport conn reuse vs. delivery race. Bug 1810
[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 uschar * message_local_identity,
1310 * current_local_identity,
1311 * new_sender_address;
1312
1313 current_local_identity =
1314 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1315
1316 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1317 return 0;
1318
1319 message_local_identity =
1320 smtp_local_identity(new_sender_address, s_compare->tblock);
1321
1322 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1323 }
1324
1325
1326
1327 uschar
1328 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1329 {
1330 #ifdef SUPPORT_TLS
1331 if (checks & PEER_OFFERED_TLS)
1332 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_TLS;
1334 #endif
1335
1336 if ( checks & PEER_OFFERED_IGNQ
1337 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1338 PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~PEER_OFFERED_IGNQ;
1340
1341 #ifndef DISABLE_PRDR
1342 if ( checks & PEER_OFFERED_PRDR
1343 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_PRDR;
1345 #endif
1346
1347 #ifdef SUPPORT_I18N
1348 if ( checks & PEER_OFFERED_UTF8
1349 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_UTF8;
1351 #endif
1352
1353 if ( checks & PEER_OFFERED_DSN
1354 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1355 checks &= ~PEER_OFFERED_DSN;
1356
1357 if ( checks & PEER_OFFERED_PIPE
1358 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1359 PCRE_EOPT, NULL, 0) < 0)
1360 checks &= ~PEER_OFFERED_PIPE;
1361
1362 if ( checks & PEER_OFFERED_SIZE
1363 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1364 checks &= ~PEER_OFFERED_SIZE;
1365
1366 return checks;
1367 }
1368
1369
1370 /*************************************************
1371 * Deliver address list to given host *
1372 *************************************************/
1373
1374 /* If continue_hostname is not null, we get here only when continuing to
1375 deliver down an existing channel. The channel was passed as the standard
1376 input. TLS is never active on a passed channel; the previous process always
1377 closes it down before passing the connection on.
1378
1379 Otherwise, we have to make a connection to the remote host, and do the
1380 initial protocol exchange.
1381
1382 When running as an MUA wrapper, if the sender or any recipient is rejected,
1383 temporarily or permanently, we force failure for all recipients.
1384
1385 Arguments:
1386 addrlist chain of potential addresses to deliver; only those whose
1387 transport_return field is set to PENDING_DEFER are currently
1388 being processed; others should be skipped - they have either
1389 been delivered to an earlier host or IP address, or been
1390 failed by one of them.
1391 host host to deliver to
1392 host_af AF_INET or AF_INET6
1393 port default TCP/IP port to use, in host byte order
1394 interface interface to bind to, or NULL
1395 tblock transport instance block
1396 message_defer set TRUE if yield is OK, but all addresses were deferred
1397 because of a non-recipient, non-host failure, that is, a
1398 4xx response to MAIL FROM, DATA, or ".". This is a defer
1399 that is specific to the message.
1400 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1401 a second attempt after TLS initialization fails
1402
1403 Returns: OK - the connection was made and the delivery attempted;
1404 the result for each address is in its data block.
1405 DEFER - the connection could not be made, or something failed
1406 while setting up the SMTP session, or there was a
1407 non-message-specific error, such as a timeout.
1408 ERROR - a filter command is specified for this transport,
1409 and there was a problem setting it up; OR helo_data
1410 or add_headers or authenticated_sender is specified
1411 for this transport, and the string failed to expand
1412 */
1413
1414 static int
1415 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1416 uschar *interface, transport_instance *tblock,
1417 BOOL *message_defer, BOOL suppress_tls)
1418 {
1419 address_item *addr;
1420 address_item *sync_addr;
1421 address_item *first_addr = addrlist;
1422 int yield = OK;
1423 int address_count;
1424 int save_errno;
1425 int rc;
1426 time_t start_delivery_time = time(NULL);
1427 smtp_transport_options_block *ob =
1428 (smtp_transport_options_block *)(tblock->options_block);
1429 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1430 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1431 BOOL ok = FALSE;
1432 BOOL send_rset = TRUE;
1433 BOOL send_quit = TRUE;
1434 BOOL setting_up = TRUE;
1435 BOOL completed_address = FALSE;
1436 BOOL esmtp = TRUE;
1437 BOOL pending_MAIL;
1438 BOOL pass_message = FALSE;
1439 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1440 #ifndef DISABLE_PRDR
1441 BOOL prdr_active;
1442 #endif
1443 #ifdef SUPPORT_I18N
1444 BOOL utf8_needed = FALSE;
1445 #endif
1446 BOOL dsn_all_lasthop = TRUE;
1447 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1448 BOOL dane = FALSE;
1449 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1450 dns_answer tlsa_dnsa;
1451 #endif
1452 smtp_inblock inblock;
1453 smtp_outblock outblock;
1454 int max_rcpt = tblock->max_addresses;
1455 uschar *igquotstr = US"";
1456
1457 #ifdef EXPERIMENTAL_DSN_INFO
1458 uschar *smtp_greeting = NULL;
1459 uschar *helo_response = NULL;
1460 #endif
1461 uschar *helo_data = NULL;
1462
1463 uschar *message = NULL;
1464 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1465 uschar *p;
1466 uschar buffer[4096];
1467 uschar inbuffer[4096];
1468 uschar outbuffer[4096];
1469
1470 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1471
1472 *message_defer = FALSE;
1473 smtp_command = US"initial connection";
1474 if (max_rcpt == 0) max_rcpt = 999999;
1475
1476 /* Set up the buffer for reading SMTP response packets. */
1477
1478 inblock.buffer = inbuffer;
1479 inblock.buffersize = sizeof(inbuffer);
1480 inblock.ptr = inbuffer;
1481 inblock.ptrend = inbuffer;
1482
1483 /* Set up the buffer for holding SMTP commands while pipelining */
1484
1485 outblock.buffer = outbuffer;
1486 outblock.buffersize = sizeof(outbuffer);
1487 outblock.ptr = outbuffer;
1488 outblock.cmd_count = 0;
1489 outblock.authenticating = FALSE;
1490
1491 /* Reset the parameters of a TLS session. */
1492
1493 tls_out.bits = 0;
1494 tls_out.cipher = NULL; /* the one we may use for this transport */
1495 tls_out.ourcert = NULL;
1496 tls_out.peercert = NULL;
1497 tls_out.peerdn = NULL;
1498 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1499 tls_out.sni = NULL;
1500 #endif
1501 tls_out.ocsp = OCSP_NOT_REQ;
1502
1503 /* Flip the legacy TLS-related variables over to the outbound set in case
1504 they're used in the context of the transport. Don't bother resetting
1505 afterward as we're in a subprocess. */
1506
1507 tls_modify_variables(&tls_out);
1508
1509 #ifndef SUPPORT_TLS
1510 if (smtps)
1511 {
1512 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1513 DEFER, FALSE);
1514 return ERROR;
1515 }
1516 #endif
1517
1518 /* Make a connection to the host if this isn't a continued delivery, and handle
1519 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1520 specially so they can be identified for retries. */
1521
1522 if (continue_hostname == NULL)
1523 {
1524 /* This puts port into host->port */
1525 inblock.sock = outblock.sock =
1526 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1527
1528 if (inblock.sock < 0)
1529 {
1530 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1531 NULL, DEFER, FALSE);
1532 return DEFER;
1533 }
1534
1535 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1536 {
1537 tls_out.dane_verified = FALSE;
1538 tls_out.tlsa_usage = 0;
1539
1540 if (host->dnssec == DS_YES)
1541 {
1542 if( dane_required
1543 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1544 )
1545 {
1546 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK)
1547 {
1548 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1549 string_sprintf("DANE error: tlsa lookup %s",
1550 rc == DEFER ? "DEFER" : "FAIL"),
1551 rc, FALSE);
1552 return rc;
1553 }
1554 dane = TRUE;
1555 }
1556 }
1557 else if (dane_required)
1558 {
1559 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1560 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1561 FAIL, FALSE);
1562 return FAIL;
1563 }
1564
1565 if (dane)
1566 ob->tls_tempfail_tryclear = FALSE;
1567 }
1568 #endif /*DANE*/
1569
1570 /* Expand the greeting message while waiting for the initial response. (Makes
1571 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1572 delayed till here so that $sending_interface and $sending_port are set. */
1573
1574 helo_data = expand_string(ob->helo_data);
1575 #ifdef SUPPORT_I18N
1576 if (helo_data)
1577 {
1578 uschar * errstr = NULL;
1579 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1580 {
1581 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1582 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1583 yield = DEFER;
1584 goto SEND_QUIT;
1585 }
1586 }
1587 #endif
1588
1589 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1590 is nevertheless a reasonably clean way of programming this kind of logic,
1591 where you want to escape on any error. */
1592
1593 if (!smtps)
1594 {
1595 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1596 '2', ob->command_timeout);
1597 #ifdef EXPERIMENTAL_DSN_INFO
1598 smtp_greeting = string_copy(buffer);
1599 #endif
1600 if (!good_response) goto RESPONSE_FAILED;
1601
1602 #ifndef DISABLE_EVENT
1603 {
1604 uschar * s;
1605 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1606 : host->dnssec==DS_NO ? US"no" : NULL;
1607 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1608 if (s)
1609 {
1610 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1611 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1612 DEFER, FALSE);
1613 yield = DEFER;
1614 goto SEND_QUIT;
1615 }
1616 }
1617 #endif
1618
1619 /* Now check if the helo_data expansion went well, and sign off cleanly if
1620 it didn't. */
1621
1622 if (helo_data == NULL)
1623 {
1624 uschar *message = string_sprintf("failed to expand helo_data: %s",
1625 expand_string_message);
1626 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1627 yield = DEFER;
1628 goto SEND_QUIT;
1629 }
1630 }
1631
1632 /** Debugging without sending a message
1633 addrlist->transport_return = DEFER;
1634 goto SEND_QUIT;
1635 **/
1636
1637 /* Errors that occur after this point follow an SMTP command, which is
1638 left in big_buffer by smtp_write_command() for use in error messages. */
1639
1640 smtp_command = big_buffer;
1641
1642 /* Tell the remote who we are...
1643
1644 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1645 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1646 greeting is of this form. The assumption was that the far end supports it
1647 properly... but experience shows that there are some that give 5xx responses,
1648 even though the banner includes "ESMTP" (there's a bloody-minded one that
1649 says "ESMTP not spoken here"). Cope with that case.
1650
1651 September 2000: Time has passed, and it seems reasonable now to always send
1652 EHLO at the start. It is also convenient to make the change while installing
1653 the TLS stuff.
1654
1655 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1656 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1657 would be no way to send out the mails, so there is now a host list
1658 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1659 PIPELINING problem as well. Maybe it can also be useful to cure other
1660 problems with broken servers.
1661
1662 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1663 Then somebody tried it with a Microsoft mailer... It seems that all other
1664 mailers use upper case for some reason (the RFC is quite clear about case
1665 independence) so, for peace of mind, I gave in. */
1666
1667 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1668
1669 /* Alas; be careful, since this goto is not an error-out, so conceivably
1670 we might set data between here and the target which we assume to exist
1671 and be usable. I can see this coming back to bite us. */
1672 #ifdef SUPPORT_TLS
1673 if (smtps)
1674 {
1675 tls_offered = TRUE;
1676 suppress_tls = FALSE;
1677 ob->tls_tempfail_tryclear = FALSE;
1678 smtp_command = US"SSL-on-connect";
1679 goto TLS_NEGOTIATE;
1680 }
1681 #endif
1682
1683 if (esmtp)
1684 {
1685 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1686 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1687 goto SEND_FAILED;
1688 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1689 ob->command_timeout))
1690 {
1691 if (errno != 0 || buffer[0] == 0 || lmtp)
1692 {
1693 #ifdef EXPERIMENTAL_DSN_INFO
1694 helo_response = string_copy(buffer);
1695 #endif
1696 goto RESPONSE_FAILED;
1697 }
1698 esmtp = FALSE;
1699 }
1700 #ifdef EXPERIMENTAL_DSN_INFO
1701 helo_response = string_copy(buffer);
1702 #endif
1703 }
1704 else
1705 {
1706 DEBUG(D_transport)
1707 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1708 }
1709
1710 if (!esmtp)
1711 {
1712 BOOL good_response;
1713
1714 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1715 goto SEND_FAILED;
1716 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1717 '2', ob->command_timeout);
1718 #ifdef EXPERIMENTAL_DSN_INFO
1719 helo_response = string_copy(buffer);
1720 #endif
1721 if (!good_response) goto RESPONSE_FAILED;
1722 }
1723
1724 if (esmtp || lmtp)
1725 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1726 PEER_OFFERED_TLS
1727 | 0 /* IGNQ checked later */
1728 | 0 /* PRDR checked later */
1729 | 0 /* UTF8 checked later */
1730 | 0 /* DSN checked later */
1731 | 0 /* PIPE checked later */
1732 | 0 /* SIZE checked later */
1733 );
1734
1735 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1736
1737 #ifdef SUPPORT_TLS
1738 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1739 #endif
1740 }
1741
1742 /* For continuing deliveries down the same channel, the socket is the standard
1743 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1744 below). Set up the pointer to where subsequent commands will be left, for
1745 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1746 set from the command line if they were set in the process that passed the
1747 connection on. */
1748
1749 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1750 as the contine goes via transport_pass_socket() and doublefork and exec.
1751 It does not wait. Unclear how we keep separate host's responses
1752 separate - we could match up by host ip+port as a bodge. */
1753
1754 else
1755 {
1756 inblock.sock = outblock.sock = fileno(stdin);
1757 smtp_command = big_buffer;
1758 host->port = port; /* Record the port that was used */
1759 }
1760
1761 /* If TLS is available on this connection, whether continued or not, attempt to
1762 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1763 send another EHLO - the server may give a different answer in secure mode. We
1764 use a separate buffer for reading the response to STARTTLS so that if it is
1765 negative, the original EHLO data is available for subsequent analysis, should
1766 the client not be required to use TLS. If the response is bad, copy the buffer
1767 for error analysis. */
1768
1769 #ifdef SUPPORT_TLS
1770 if ( tls_offered
1771 && !suppress_tls
1772 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1773 {
1774 uschar buffer2[4096];
1775 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1776 goto SEND_FAILED;
1777
1778 /* If there is an I/O error, transmission of this message is deferred. If
1779 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1780 false, we also defer. However, if there is a temporary rejection of STARTTLS
1781 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1782 STARTTLS, we carry on. This means we will try to send the message in clear,
1783 unless the host is in hosts_require_tls (tested below). */
1784
1785 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1786 ob->command_timeout))
1787 {
1788 if ( errno != 0
1789 || buffer2[0] == 0
1790 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1791 )
1792 {
1793 Ustrncpy(buffer, buffer2, sizeof(buffer));
1794 goto RESPONSE_FAILED;
1795 }
1796 }
1797
1798 /* STARTTLS accepted: try to negotiate a TLS session. */
1799
1800 else
1801 TLS_NEGOTIATE:
1802 {
1803 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1804 # ifdef EXPERIMENTAL_DANE
1805 , dane ? &tlsa_dnsa : NULL
1806 # endif
1807 );
1808
1809 /* TLS negotiation failed; give an error. From outside, this function may
1810 be called again to try in clear on a new connection, if the options permit
1811 it for this host. */
1812
1813 if (rc != OK)
1814 {
1815 # ifdef EXPERIMENTAL_DANE
1816 if (rc == DEFER && dane)
1817 {
1818 log_write(0, LOG_MAIN,
1819 "DANE attempt failed; no TLS connection to %s [%s]",
1820 host->name, host->address);
1821 }
1822 # endif
1823
1824 save_errno = ERRNO_TLSFAILURE;
1825 message = US"failure while setting up TLS session";
1826 send_quit = FALSE;
1827 goto TLS_FAILED;
1828 }
1829
1830 /* TLS session is set up */
1831
1832 for (addr = addrlist; addr; addr = addr->next)
1833 if (addr->transport_return == PENDING_DEFER)
1834 {
1835 addr->cipher = tls_out.cipher;
1836 addr->ourcert = tls_out.ourcert;
1837 addr->peercert = tls_out.peercert;
1838 addr->peerdn = tls_out.peerdn;
1839 addr->ocsp = tls_out.ocsp;
1840 }
1841 }
1842 }
1843
1844 /* if smtps, we'll have smtp_command set to something else; always safe to
1845 reset it here. */
1846 smtp_command = big_buffer;
1847
1848 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1849 helo_data is null, we are dealing with a connection that was passed from
1850 another process, and so we won't have expanded helo_data above. We have to
1851 expand it here. $sending_ip_address and $sending_port are set up right at the
1852 start of the Exim process (in exim.c). */
1853
1854 if (tls_out.active >= 0)
1855 {
1856 char *greeting_cmd;
1857 BOOL good_response;
1858
1859 if (helo_data == NULL)
1860 {
1861 helo_data = expand_string(ob->helo_data);
1862 if (helo_data == NULL)
1863 {
1864 uschar *message = string_sprintf("failed to expand helo_data: %s",
1865 expand_string_message);
1866 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1867 yield = DEFER;
1868 goto SEND_QUIT;
1869 }
1870 }
1871
1872 /* For SMTPS we need to wait for the initial OK response. */
1873 if (smtps)
1874 {
1875 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1876 '2', ob->command_timeout);
1877 #ifdef EXPERIMENTAL_DSN_INFO
1878 smtp_greeting = string_copy(buffer);
1879 #endif
1880 if (!good_response) goto RESPONSE_FAILED;
1881 }
1882
1883 if (esmtp)
1884 greeting_cmd = "EHLO";
1885 else
1886 {
1887 greeting_cmd = "HELO";
1888 DEBUG(D_transport)
1889 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1890 }
1891
1892 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1893 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1894 goto SEND_FAILED;
1895 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1896 '2', ob->command_timeout);
1897 #ifdef EXPERIMENTAL_DSN_INFO
1898 helo_response = string_copy(buffer);
1899 #endif
1900 if (!good_response) goto RESPONSE_FAILED;
1901 }
1902
1903 /* If the host is required to use a secure channel, ensure that we
1904 have one. */
1905
1906 else if (
1907 # ifdef EXPERIMENTAL_DANE
1908 dane ||
1909 # endif
1910 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1911 )
1912 {
1913 save_errno = ERRNO_TLSREQUIRED;
1914 message = string_sprintf("a TLS session is required, but %s",
1915 tls_offered? "an attempt to start TLS failed" :
1916 "the server did not offer TLS support");
1917 goto TLS_FAILED;
1918 }
1919 #endif /*SUPPORT_TLS*/
1920
1921 /* If TLS is active, we have just started it up and re-done the EHLO command,
1922 so its response needs to be analyzed. If TLS is not active and this is a
1923 continued session down a previously-used socket, we haven't just done EHLO, so
1924 we skip this. */
1925
1926 if (continue_hostname == NULL
1927 #ifdef SUPPORT_TLS
1928 || tls_out.active >= 0
1929 #endif
1930 )
1931 {
1932 if (esmtp || lmtp)
1933 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1934 0 /* no TLS */
1935 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1936 | PEER_OFFERED_PRDR
1937 #ifdef SUPPORT_I18N
1938 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1939 /*XXX if we hand peercaps on to continued-conn processes,
1940 must not depend on this addr */
1941 #endif
1942 | PEER_OFFERED_DSN
1943 | PEER_OFFERED_PIPE
1944 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1945 );
1946
1947 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1948 lmtp_ignore_quota option was set. */
1949
1950 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1951
1952 /* If the response to EHLO specified support for the SIZE parameter, note
1953 this, provided size_addition is non-negative. */
1954
1955 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1956
1957 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1958 the current host, esmtp will be false, so PIPELINING can never be used. If
1959 the current host matches hosts_avoid_pipelining, don't do it. */
1960
1961 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1962 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1963
1964 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1965 smtp_use_pipelining ? "" : "not ");
1966
1967 #ifndef DISABLE_PRDR
1968 if ( peer_offered & PEER_OFFERED_PRDR
1969 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1970 peer_offered &= ~PEER_OFFERED_PRDR;
1971
1972 if (peer_offered & PEER_OFFERED_PRDR)
1973 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1974 #endif
1975
1976 /* Note if the server supports DSN */
1977 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1978 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1979
1980 /* Note if the response to EHLO specifies support for the AUTH extension.
1981 If it has, check that this host is one we want to authenticate to, and do
1982 the business. The host name and address must be available when the
1983 authenticator's client driver is running. */
1984
1985 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1986 ob, esmtp, &inblock, &outblock))
1987 {
1988 default: goto SEND_QUIT;
1989 case OK: break;
1990 case FAIL_SEND: goto SEND_FAILED;
1991 case FAIL: goto RESPONSE_FAILED;
1992 }
1993 }
1994
1995 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1996 message-specific. */
1997
1998 setting_up = FALSE;
1999
2000 #ifdef SUPPORT_I18N
2001 if (addrlist->prop.utf8_msg)
2002 {
2003 utf8_needed = !addrlist->prop.utf8_downcvt
2004 && !addrlist->prop.utf8_downcvt_maybe;
2005 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2006 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2007 }
2008
2009 /* If this is an international message we need the host to speak SMTPUTF8 */
2010 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2011 {
2012 errno = ERRNO_UTF8_FWD;
2013 goto RESPONSE_FAILED;
2014 }
2015 #endif
2016
2017 /* If there is a filter command specified for this transport, we can now
2018 set it up. This cannot be done until the identify of the host is known. */
2019
2020 if (tblock->filter_command != NULL)
2021 {
2022 BOOL rc;
2023 uschar buffer[64];
2024 sprintf(CS buffer, "%.50s transport", tblock->name);
2025 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2026 TRUE, DEFER, addrlist, buffer, NULL);
2027 transport_filter_timeout = tblock->filter_timeout;
2028
2029 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2030 yield ERROR. */
2031
2032 if (!rc)
2033 {
2034 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2035 FALSE);
2036 yield = ERROR;
2037 goto SEND_QUIT;
2038 }
2039 }
2040
2041
2042 /* For messages that have more than the maximum number of envelope recipients,
2043 we want to send several transactions down the same SMTP connection. (See
2044 comments in deliver.c as to how this reconciles, heuristically, with
2045 remote_max_parallel.) This optimization was added to Exim after the following
2046 code was already working. The simplest way to put it in without disturbing the
2047 code was to use a goto to jump back to this point when there is another
2048 transaction to handle. */
2049
2050 SEND_MESSAGE:
2051 sync_addr = first_addr;
2052 address_count = 0;
2053 ok = FALSE;
2054 send_rset = TRUE;
2055 completed_address = FALSE;
2056
2057
2058 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2059 qualification, send it, adding something to the message size to allow for
2060 imprecision and things that get added en route. Exim keeps the number of lines
2061 in a message, so we can give an accurate value for the original message, but we
2062 need some additional to handle added headers. (Double "." characters don't get
2063 included in the count.) */
2064
2065 p = buffer;
2066 *p = 0;
2067
2068 if (smtp_use_size)
2069 {
2070 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2071 while (*p) p++;
2072 }
2073
2074 #ifndef DISABLE_PRDR
2075 prdr_active = FALSE;
2076 if (peer_offered & PEER_OFFERED_PRDR)
2077 for (addr = first_addr; addr; addr = addr->next)
2078 if (addr->transport_return == PENDING_DEFER)
2079 {
2080 for (addr = addr->next; addr; addr = addr->next)
2081 if (addr->transport_return == PENDING_DEFER)
2082 { /* at least two recipients to send */
2083 prdr_active = TRUE;
2084 sprintf(CS p, " PRDR"); p += 5;
2085 break;
2086 }
2087 break;
2088 }
2089 #endif
2090
2091 #ifdef SUPPORT_I18N
2092 if ( addrlist->prop.utf8_msg
2093 && !addrlist->prop.utf8_downcvt
2094 && peer_offered & PEER_OFFERED_UTF8
2095 )
2096 sprintf(CS p, " SMTPUTF8"), p += 9;
2097 #endif
2098
2099 /* check if all addresses have lasthop flag */
2100 /* do not send RET and ENVID if true */
2101 for (dsn_all_lasthop = TRUE, addr = first_addr;
2102 address_count < max_rcpt && addr != NULL;
2103 addr = addr->next)
2104 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2105 {
2106 dsn_all_lasthop = FALSE;
2107 break;
2108 }
2109
2110 /* Add any DSN flags to the mail command */
2111
2112 if (smtp_use_dsn && !dsn_all_lasthop)
2113 {
2114 if (dsn_ret == dsn_ret_hdrs)
2115 {
2116 Ustrcpy(p, " RET=HDRS");
2117 while (*p) p++;
2118 }
2119 else if (dsn_ret == dsn_ret_full)
2120 {
2121 Ustrcpy(p, " RET=FULL");
2122 while (*p) p++;
2123 }
2124 if (dsn_envid != NULL)
2125 {
2126 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2127 while (*p) p++;
2128 }
2129 }
2130
2131 /* If an authenticated_sender override has been specified for this transport
2132 instance, expand it. If the expansion is forced to fail, and there was already
2133 an authenticated_sender for this message, the original value will be used.
2134 Other expansion failures are serious. An empty result is ignored, but there is
2135 otherwise no check - this feature is expected to be used with LMTP and other
2136 cases where non-standard addresses (e.g. without domains) might be required. */
2137
2138 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2139 {
2140 yield = ERROR;
2141 goto SEND_QUIT;
2142 }
2143
2144 /* From here until we send the DATA command, we can make use of PIPELINING
2145 if the server host supports it. The code has to be able to check the responses
2146 at any point, for when the buffer fills up, so we write it totally generally.
2147 When PIPELINING is off, each command written reports that it has flushed the
2148 buffer. */
2149
2150 pending_MAIL = TRUE; /* The block starts with MAIL */
2151
2152 {
2153 uschar * s = return_path;
2154 #ifdef SUPPORT_I18N
2155 uschar * errstr = NULL;
2156
2157 /* If we must downconvert, do the from-address here. Remember we had to
2158 for the to-addresses (done below), and also (ugly) for re-doing when building
2159 the delivery log line. */
2160
2161 if ( addrlist->prop.utf8_msg
2162 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2163 )
2164 {
2165 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2166 {
2167 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2168 yield = ERROR;
2169 goto SEND_QUIT;
2170 }
2171 setflag(addrlist, af_utf8_downcvt);
2172 }
2173 #endif
2174
2175 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2176 "MAIL FROM:<%s>%s\r\n", s, buffer);
2177 }
2178
2179 mail_command = string_copy(big_buffer); /* Save for later error message */
2180
2181 switch(rc)
2182 {
2183 case -1: /* Transmission error */
2184 goto SEND_FAILED;
2185
2186 case +1: /* Block was sent */
2187 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2188 ob->command_timeout))
2189 {
2190 if (errno == 0 && buffer[0] == '4')
2191 {
2192 errno = ERRNO_MAIL4XX;
2193 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2194 }
2195 goto RESPONSE_FAILED;
2196 }
2197 pending_MAIL = FALSE;
2198 break;
2199 }
2200
2201 /* Pass over all the relevant recipient addresses for this host, which are the
2202 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2203 several before we have to read the responses for those seen so far. This
2204 checking is done by a subroutine because it also needs to be done at the end.
2205 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2206 the next one if not all are sent.
2207
2208 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2209 last address because we want to abort if any recipients have any kind of
2210 problem, temporary or permanent. We know that all recipient addresses will have
2211 the PENDING_DEFER status, because only one attempt is ever made, and we know
2212 that max_rcpt will be large, so all addresses will be done at once. */
2213
2214 for (addr = first_addr;
2215 address_count < max_rcpt && addr != NULL;
2216 addr = addr->next)
2217 {
2218 int count;
2219 BOOL no_flush;
2220 uschar * rcpt_addr;
2221
2222 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2223
2224 if (addr->transport_return != PENDING_DEFER) continue;
2225
2226 address_count++;
2227 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2228
2229 /* Add any DSN flags to the rcpt command and add to the sent string */
2230
2231 p = buffer;
2232 *p = 0;
2233
2234 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2235 {
2236 if ((addr->dsn_flags & rf_dsnflags) != 0)
2237 {
2238 int i;
2239 BOOL first = TRUE;
2240 Ustrcpy(p, " NOTIFY=");
2241 while (*p) p++;
2242 for (i = 0; i < 4; i++)
2243 if ((addr->dsn_flags & rf_list[i]) != 0)
2244 {
2245 if (!first) *p++ = ',';
2246 first = FALSE;
2247 Ustrcpy(p, rf_names[i]);
2248 while (*p) p++;
2249 }
2250 }
2251
2252 if (addr->dsn_orcpt != NULL)
2253 {
2254 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2255 addr->dsn_orcpt);
2256 while (*p) p++;
2257 }
2258 }
2259
2260 /* Now send the RCPT command, and process outstanding responses when
2261 necessary. After a timeout on RCPT, we just end the function, leaving the
2262 yield as OK, because this error can often mean that there is a problem with
2263 just one address, so we don't want to delay the host. */
2264
2265 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2266
2267 #ifdef SUPPORT_I18N
2268 {
2269 uschar * dummy_errstr;
2270 if ( testflag(addrlist, af_utf8_downcvt)
2271 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2272 dummy_errstr
2273 ) )
2274 {
2275 errno = ERRNO_EXPANDFAIL;
2276 goto SEND_FAILED;
2277 }
2278 }
2279 #endif
2280
2281 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2282 rcpt_addr, igquotstr, buffer);
2283
2284 if (count < 0) goto SEND_FAILED;
2285 if (count > 0)
2286 {
2287 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2288 &sync_addr, host, count, ob->address_retry_include_sender,
2289 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2290 sizeof(buffer)))
2291 {
2292 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2293 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2294 break;
2295
2296 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2297 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2298 case 0: /* No 2xx or 5xx, but no probs */
2299 break;
2300
2301 case -1: goto END_OFF; /* Timeout on RCPT */
2302 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2303 }
2304 pending_MAIL = FALSE; /* Dealt with MAIL */
2305 }
2306 } /* Loop for next address */
2307
2308 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2309 permanently or temporarily. We should have flushed and synced after the last
2310 RCPT. */
2311
2312 if (mua_wrapper)
2313 {
2314 address_item *badaddr;
2315 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2316 if (badaddr->transport_return != PENDING_OK)
2317 {
2318 /*XXX could we find a better errno than 0 here? */
2319 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2320 testflag(badaddr, af_pass_message));
2321 ok = FALSE;
2322 break;
2323 }
2324 }
2325
2326 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2327 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2328 have a good recipient buffered up if we are pipelining. We don't want to waste
2329 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2330 are pipelining. The responses are all handled by sync_responses(). */
2331
2332 if (ok || (smtp_use_pipelining && !mua_wrapper))
2333 {
2334 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2335 if (count < 0) goto SEND_FAILED;
2336 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2337 host, count, ob->address_retry_include_sender, pending_MAIL,
2338 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2339 {
2340 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2341 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2342 break;
2343
2344 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2345 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2346 case 0: break; /* No 2xx or 5xx, but no probs */
2347
2348 case -1: goto END_OFF; /* Timeout on RCPT */
2349 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2350 }
2351 }
2352
2353 /* Save the first address of the next batch. */
2354
2355 first_addr = addr;
2356
2357 /* If there were no good recipients (but otherwise there have been no
2358 problems), just set ok TRUE, since we have handled address-specific errors
2359 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2360 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2361 well as body. Set the appropriate timeout value to be used for each chunk.
2362 (Haven't been able to make it work using select() for writing yet.) */
2363
2364 if (!ok) ok = TRUE; else
2365 {
2366 sigalrm_seen = FALSE;
2367 transport_write_timeout = ob->data_timeout;
2368 smtp_command = US"sending data block"; /* For error messages */
2369 DEBUG(D_transport|D_v)
2370 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2371 transport_count = 0;
2372
2373 #ifndef DISABLE_DKIM
2374 ok = dkim_transport_write_message(addrlist, inblock.sock,
2375 topt_use_crlf | topt_end_dot | topt_escape_headers |
2376 (tblock->body_only? topt_no_headers : 0) |
2377 (tblock->headers_only? topt_no_body : 0) |
2378 (tblock->return_path_add? topt_add_return_path : 0) |
2379 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2380 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2381 0, /* No size limit */
2382 tblock->add_headers, tblock->remove_headers,
2383 US".", US"..", /* Escaping strings */
2384 tblock->rewrite_rules, tblock->rewrite_existflags,
2385 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2386 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2387 );
2388 #else
2389 ok = transport_write_message(addrlist, inblock.sock,
2390 topt_use_crlf | topt_end_dot | topt_escape_headers |
2391 (tblock->body_only? topt_no_headers : 0) |
2392 (tblock->headers_only? topt_no_body : 0) |
2393 (tblock->return_path_add? topt_add_return_path : 0) |
2394 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2395 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2396 0, /* No size limit */
2397 tblock->add_headers, tblock->remove_headers,
2398 US".", US"..", /* Escaping strings */
2399 tblock->rewrite_rules, tblock->rewrite_existflags);
2400 #endif
2401
2402 /* transport_write_message() uses write() because it is called from other
2403 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2404 it can exit with "Broken pipe" as its error. This really means that the
2405 socket got closed at the far end. */
2406
2407 transport_write_timeout = 0; /* for subsequent transports */
2408
2409 /* Failure can either be some kind of I/O disaster (including timeout),
2410 or the failure of a transport filter or the expansion of added headers. */
2411
2412 if (!ok)
2413 {
2414 buffer[0] = 0; /* There hasn't been a response */
2415 goto RESPONSE_FAILED;
2416 }
2417
2418 /* We used to send the terminating "." explicitly here, but because of
2419 buffering effects at both ends of TCP/IP connections, you don't gain
2420 anything by keeping it separate, so it might as well go in the final
2421 data buffer for efficiency. This is now done by setting the topt_end_dot
2422 flag above. */
2423
2424 smtp_command = US"end of data";
2425
2426 #ifndef DISABLE_PRDR
2427 /* For PRDR we optionally get a partial-responses warning
2428 * followed by the individual responses, before going on with
2429 * the overall response. If we don't get the warning then deal
2430 * with per non-PRDR. */
2431 if(prdr_active)
2432 {
2433 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2434 ob->final_timeout);
2435 if (!ok && errno == 0)
2436 switch(buffer[0])
2437 {
2438 case '2': prdr_active = FALSE;
2439 ok = TRUE;
2440 break;
2441 case '4': errno = ERRNO_DATA4XX;
2442 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2443 break;
2444 }
2445 }
2446 else
2447 #endif
2448
2449 /* For non-PRDR SMTP, we now read a single response that applies to the
2450 whole message. If it is OK, then all the addresses have been delivered. */
2451
2452 if (!lmtp)
2453 {
2454 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2455 ob->final_timeout);
2456 if (!ok && errno == 0 && buffer[0] == '4')
2457 {
2458 errno = ERRNO_DATA4XX;
2459 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2460 }
2461 }
2462
2463 /* For LMTP, we get back a response for every RCPT command that we sent;
2464 some may be accepted and some rejected. For those that get a response, their
2465 status is fixed; any that are accepted have been handed over, even if later
2466 responses crash - at least, that's how I read RFC 2033.
2467
2468 If all went well, mark the recipient addresses as completed, record which
2469 host/IPaddress they were delivered to, and cut out RSET when sending another
2470 message down the same channel. Write the completed addresses to the journal
2471 now so that they are recorded in case there is a crash of hardware or
2472 software before the spool gets updated. Also record the final SMTP
2473 confirmation if needed (for SMTP only). */
2474
2475 if (ok)
2476 {
2477 int flag = '=';
2478 int delivery_time = (int)(time(NULL) - start_delivery_time);
2479 int len;
2480 uschar *conf = NULL;
2481 send_rset = FALSE;
2482
2483 /* Set up confirmation if needed - applies only to SMTP */
2484
2485 if (
2486 #ifdef DISABLE_EVENT
2487 LOGGING(smtp_confirmation) &&
2488 #endif
2489 !lmtp
2490 )
2491 {
2492 const uschar *s = string_printing(buffer);
2493 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2494 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2495 }
2496
2497 /* Process all transported addresses - for LMTP or PRDR, read a status for
2498 each one. */
2499
2500 for (addr = addrlist; addr != first_addr; addr = addr->next)
2501 {
2502 if (addr->transport_return != PENDING_OK) continue;
2503
2504 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2505 remaining addresses. Otherwise, it's a return code for just the one
2506 address. For temporary errors, add a retry item for the address so that
2507 it doesn't get tried again too soon. */
2508
2509 #ifndef DISABLE_PRDR
2510 if (lmtp || prdr_active)
2511 #else
2512 if (lmtp)
2513 #endif
2514 {
2515 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2516 ob->final_timeout))
2517 {
2518 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2519 addr->message = string_sprintf(
2520 #ifndef DISABLE_PRDR
2521 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2522 #else
2523 "LMTP error after %s: %s",
2524 #endif
2525 big_buffer, string_printing(buffer));
2526 setflag(addr, af_pass_message); /* Allow message to go to user */
2527 if (buffer[0] == '5')
2528 addr->transport_return = FAIL;
2529 else
2530 {
2531 errno = ERRNO_DATA4XX;
2532 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2533 addr->transport_return = DEFER;
2534 #ifndef DISABLE_PRDR
2535 if (!prdr_active)
2536 #endif
2537 retry_add_item(addr, addr->address_retry_key, 0);
2538 }
2539 continue;
2540 }
2541 completed_address = TRUE; /* NOW we can set this flag */
2542 if (LOGGING(smtp_confirmation))
2543 {
2544 const uschar *s = string_printing(buffer);
2545 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2546 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2547 }
2548 }
2549
2550 /* SMTP, or success return from LMTP for this address. Pass back the
2551 actual host that was used. */
2552
2553 addr->transport_return = OK;
2554 addr->more_errno = delivery_time;
2555 addr->host_used = host;
2556 addr->special_action = flag;
2557 addr->message = conf;
2558 #ifndef DISABLE_PRDR
2559 if (prdr_active) addr->flags |= af_prdr_used;
2560 #endif
2561 flag = '-';
2562
2563 #ifndef DISABLE_PRDR
2564 if (!prdr_active)
2565 #endif
2566 {
2567 /* Update the journal. For homonymic addresses, use the base address plus
2568 the transport name. See lots of comments in deliver.c about the reasons
2569 for the complications when homonyms are involved. Just carry on after
2570 write error, as it may prove possible to update the spool file later. */
2571
2572 if (testflag(addr, af_homonym))
2573 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2574 else
2575 sprintf(CS buffer, "%.500s\n", addr->unique);
2576
2577 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2578 len = Ustrlen(CS buffer);
2579 if (write(journal_fd, buffer, len) != len)
2580 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2581 "%s: %s", buffer, strerror(errno));
2582 }
2583 }
2584
2585 #ifndef DISABLE_PRDR
2586 if (prdr_active)
2587 {
2588 /* PRDR - get the final, overall response. For any non-success
2589 upgrade all the address statuses. */
2590 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2591 ob->final_timeout);
2592 if (!ok)
2593 {
2594 if(errno == 0 && buffer[0] == '4')
2595 {
2596 errno = ERRNO_DATA4XX;
2597 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2598 }
2599 for (addr = addrlist; addr != first_addr; addr = addr->next)
2600 if (buffer[0] == '5' || addr->transport_return == OK)
2601 addr->transport_return = PENDING_OK; /* allow set_errno action */
2602 goto RESPONSE_FAILED;
2603 }
2604
2605 /* Update the journal, or setup retry. */
2606 for (addr = addrlist; addr != first_addr; addr = addr->next)
2607 if (addr->transport_return == OK)
2608 {
2609 if (testflag(addr, af_homonym))
2610 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2611 else
2612 sprintf(CS buffer, "%.500s\n", addr->unique);
2613
2614 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2615 len = Ustrlen(CS buffer);
2616 if (write(journal_fd, buffer, len) != len)
2617 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2618 "%s: %s", buffer, strerror(errno));
2619 }
2620 else if (addr->transport_return == DEFER)
2621 retry_add_item(addr, addr->address_retry_key, -2);
2622 }
2623 #endif
2624
2625 /* Ensure the journal file is pushed out to disk. */
2626
2627 if (EXIMfsync(journal_fd) < 0)
2628 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2629 strerror(errno));
2630 }
2631 }
2632
2633
2634 /* Handle general (not specific to one address) failures here. The value of ok
2635 is used to skip over this code on the falling through case. A timeout causes a
2636 deferral. Other errors may defer or fail according to the response code, and
2637 may set up a special errno value, e.g. after connection chopped, which is
2638 assumed if errno == 0 and there is no text in the buffer. If control reaches
2639 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2640 the problem is not related to this specific message. */
2641
2642 if (!ok)
2643 {
2644 int code, set_rc;
2645 uschar * set_message;
2646
2647 RESPONSE_FAILED:
2648 {
2649 save_errno = errno;
2650 message = NULL;
2651 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2652 buffer, &code, &message, &pass_message);
2653 goto FAILED;
2654 }
2655
2656 SEND_FAILED:
2657 {
2658 save_errno = errno;
2659 code = '4';
2660 message = US string_sprintf("send() to %s [%s] failed: %s",
2661 host->name, host->address, strerror(save_errno));
2662 send_quit = FALSE;
2663 goto FAILED;
2664 }
2665
2666 /* This label is jumped to directly when a TLS negotiation has failed,
2667 or was not done for a host for which it is required. Values will be set
2668 in message and save_errno, and setting_up will always be true. Treat as
2669 a temporary error. */
2670
2671 #ifdef SUPPORT_TLS
2672 TLS_FAILED:
2673 code = '4';
2674 #endif
2675
2676 /* If the failure happened while setting up the call, see if the failure was
2677 a 5xx response (this will either be on connection, or following HELO - a 5xx
2678 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2679 never going to accept them. For other errors during setting up (timeouts or
2680 whatever), defer all addresses, and yield DEFER, so that the host is not
2681 tried again for a while. */
2682
2683 FAILED:
2684 ok = FALSE; /* For when reached by GOTO */
2685 set_message = message;
2686
2687 if (setting_up)
2688 {
2689 if (code == '5')
2690 set_rc = FAIL;
2691 else
2692 yield = set_rc = DEFER;
2693 }
2694
2695 /* We want to handle timeouts after MAIL or "." and loss of connection after
2696 "." specially. They can indicate a problem with the sender address or with
2697 the contents of the message rather than a real error on the connection. These
2698 cases are treated in the same way as a 4xx response. This next bit of code
2699 does the classification. */
2700
2701 else
2702 {
2703 BOOL message_error;
2704
2705 switch(save_errno)
2706 {
2707 #ifdef SUPPORT_I18N
2708 case ERRNO_UTF8_FWD:
2709 code = '5';
2710 /*FALLTHROUGH*/
2711 #endif
2712 case 0:
2713 case ERRNO_MAIL4XX:
2714 case ERRNO_DATA4XX:
2715 message_error = TRUE;
2716 break;
2717
2718 case ETIMEDOUT:
2719 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2720 Ustrncmp(smtp_command,"end ",4) == 0;
2721 break;
2722
2723 case ERRNO_SMTPCLOSED:
2724 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2725 break;
2726
2727 default:
2728 message_error = FALSE;
2729 break;
2730 }
2731
2732 /* Handle the cases that are treated as message errors. These are:
2733
2734 (a) negative response or timeout after MAIL
2735 (b) negative response after DATA
2736 (c) negative response or timeout or dropped connection after "."
2737 (d) utf8 support required and not offered
2738
2739 It won't be a negative response or timeout after RCPT, as that is dealt
2740 with separately above. The action in all cases is to set an appropriate
2741 error code for all the addresses, but to leave yield set to OK because the
2742 host itself has not failed. Of course, it might in practice have failed
2743 when we've had a timeout, but if so, we'll discover that at the next
2744 delivery attempt. For a temporary error, set the message_defer flag, and
2745 write to the logs for information if this is not the last host. The error
2746 for the last host will be logged as part of the address's log line. */
2747
2748 if (message_error)
2749 {
2750 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2751
2752 /* If there's an errno, the message contains just the identity of
2753 the host. */
2754
2755 if (code == '5')
2756 set_rc = FAIL;
2757 else /* Anything other than 5 is treated as temporary */
2758 {
2759 set_rc = DEFER;
2760 if (save_errno > 0)
2761 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2762 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2763 msglog_line(host, message);
2764 *message_defer = TRUE;
2765 }
2766 }
2767
2768 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2769 ".", or some other transportation error. We defer all addresses and yield
2770 DEFER, except for the case of failed add_headers expansion, or a transport
2771 filter failure, when the yield should be ERROR, to stop it trying other
2772 hosts. */
2773
2774 else
2775 {
2776 set_rc = DEFER;
2777 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2778 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2779 }
2780 }
2781
2782 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2783 #ifdef EXPERIMENTAL_DSN_INFO
2784 , smtp_greeting, helo_response
2785 #endif
2786 );
2787 }
2788
2789
2790 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2791 SMTP session tidily. However, if there were too many addresses to send in one
2792 message (indicated by first_addr being non-NULL) we want to carry on with the
2793 rest of them. Also, it is desirable to send more than one message down the SMTP
2794 connection if there are several waiting, provided we haven't already sent so
2795 many as to hit the configured limit. The function transport_check_waiting looks
2796 for a waiting message and returns its id. Then transport_pass_socket tries to
2797 set up a continued delivery by passing the socket on to another process. The
2798 variable send_rset is FALSE if a message has just been successfully transfered.
2799
2800 If we are already sending down a continued channel, there may be further
2801 addresses not yet delivered that are aimed at the same host, but which have not
2802 been passed in this run of the transport. In this case, continue_more will be
2803 true, and all we should do is send RSET if necessary, and return, leaving the
2804 channel open.
2805
2806 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2807 do not want to continue with other messages down the same channel, because that
2808 can lead to looping between two or more messages, all with the same,
2809 temporarily failing address(es). [The retry information isn't updated yet, so
2810 new processes keep on trying.] We probably also don't want to try more of this
2811 message's addresses either.
2812
2813 If we have started a TLS session, we have to end it before passing the
2814 connection to a new process. However, not all servers can handle this (Exim
2815 can), so we do not pass such a connection on if the host matches
2816 hosts_nopass_tls. */
2817
2818 DEBUG(D_transport)
2819 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2820 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2821 continue_more, yield, (first_addr == NULL)? "":"not ");
2822
2823 if (completed_address && ok && send_quit)
2824 {
2825 BOOL more;
2826 smtp_compare_t t_compare;
2827
2828 t_compare.tblock = tblock;
2829 t_compare.current_sender_address = sender_address;
2830
2831 if ( first_addr != NULL
2832 || continue_more
2833 || ( ( tls_out.active < 0
2834 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2835 )
2836 &&
2837 transport_check_waiting(tblock->name, host->name,
2838 tblock->connection_max_messages, new_message_id, &more,
2839 (oicf)smtp_are_same_identities, (void*)&t_compare)
2840 ) )
2841 {
2842 uschar *msg;
2843 BOOL pass_message;
2844
2845 if (send_rset)
2846 {
2847 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2848 {
2849 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2850 host->address, strerror(save_errno));
2851 send_quit = FALSE;
2852 }
2853 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2854 ob->command_timeout)))
2855 {
2856 int code;
2857 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2858 &pass_message);
2859 if (!send_quit)
2860 {
2861 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2862 host->name, host->address, msg);
2863 }
2864 }
2865 }
2866
2867 /* Either RSET was not needed, or it succeeded */
2868
2869 if (ok)
2870 {
2871 if (first_addr != NULL) /* More addresses still to be sent */
2872 { /* in this run of the transport */
2873 continue_sequence++; /* Causes * in logging */
2874 goto SEND_MESSAGE;
2875 }
2876 if (continue_more) return yield; /* More addresses for another run */
2877
2878 /* Pass the socket to a new Exim process. Before doing so, we must shut
2879 down TLS. Not all MTAs allow for the continuation of the SMTP session
2880 when TLS is shut down. We test for this by sending a new EHLO. If we
2881 don't get a good response, we don't attempt to pass the socket on. */
2882
2883 #ifdef SUPPORT_TLS
2884 if (tls_out.active >= 0)
2885 {
2886 tls_close(FALSE, TRUE);
2887 if (smtps)
2888 ok = FALSE;
2889 else
2890 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2891 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2892 ob->command_timeout);
2893 }
2894 #endif
2895
2896 /* If the socket is successfully passed, we musn't send QUIT (or
2897 indeed anything!) from here. */
2898
2899 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2900 propagate it from the initial
2901 */
2902 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2903 new_message_id, inblock.sock))
2904 {
2905 send_quit = FALSE;
2906 }
2907 }
2908
2909 /* If RSET failed and there are addresses left, they get deferred. */
2910
2911 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2912 #ifdef EXPERIMENTAL_DSN_INFO
2913 , smtp_greeting, helo_response
2914 #endif
2915 );
2916 }
2917 }
2918
2919 /* End off tidily with QUIT unless the connection has died or the socket has
2920 been passed to another process. There has been discussion on the net about what
2921 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2922 to wait for a response, but on the other hand, there isn't anything one can do
2923 with an error response, other than log it. Exim used to do that. However,
2924 further discussion suggested that it is positively advantageous not to wait for
2925 the response, but to close the session immediately. This is supposed to move
2926 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2927 load from the server. (Hosts that are both servers and clients may not see much
2928 difference, of course.) Further discussion indicated that this was safe to do
2929 on Unix systems which have decent implementations of TCP/IP that leave the
2930 connection around for a while (TIME_WAIT) after the application has gone away.
2931 This enables the response sent by the server to be properly ACKed rather than
2932 timed out, as can happen on broken TCP/IP implementations on other OS.
2933
2934 This change is being made on 31-Jul-98. After over a year of trouble-free
2935 operation, the old commented-out code was removed on 17-Sep-99. */
2936
2937 SEND_QUIT:
2938 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2939
2940 END_OFF:
2941
2942 #ifdef SUPPORT_TLS
2943 tls_close(FALSE, TRUE);
2944 #endif
2945
2946 /* Close the socket, and return the appropriate value, first setting
2947 works because the NULL setting is passed back to the calling process, and
2948 remote_max_parallel is forced to 1 when delivering over an existing connection,
2949
2950 If all went well and continue_more is set, we shouldn't actually get here if
2951 there are further addresses, as the return above will be taken. However,
2952 writing RSET might have failed, or there may be other addresses whose hosts are
2953 specified in the transports, and therefore not visible at top level, in which
2954 case continue_more won't get set. */
2955
2956 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2957 (void)close(inblock.sock);
2958
2959 #ifndef DISABLE_EVENT
2960 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2961 #endif
2962
2963 continue_transport = NULL;
2964 continue_hostname = NULL;
2965 return yield;
2966 }
2967
2968
2969
2970
2971 /*************************************************
2972 * Closedown entry point *
2973 *************************************************/
2974
2975 /* This function is called when exim is passed an open smtp channel
2976 from another incarnation, but the message which it has been asked
2977 to deliver no longer exists. The channel is on stdin.
2978
2979 We might do fancy things like looking for another message to send down
2980 the channel, but if the one we sought has gone, it has probably been
2981 delivered by some other process that itself will seek further messages,
2982 so just close down our connection.
2983
2984 Argument: pointer to the transport instance block
2985 Returns: nothing
2986 */
2987
2988 void
2989 smtp_transport_closedown(transport_instance *tblock)
2990 {
2991 smtp_transport_options_block *ob =
2992 (smtp_transport_options_block *)(tblock->options_block);
2993 smtp_inblock inblock;
2994 smtp_outblock outblock;
2995 uschar buffer[256];
2996 uschar inbuffer[4096];
2997 uschar outbuffer[16];
2998
2999 inblock.sock = fileno(stdin);
3000 inblock.buffer = inbuffer;
3001 inblock.buffersize = sizeof(inbuffer);
3002 inblock.ptr = inbuffer;
3003 inblock.ptrend = inbuffer;
3004
3005 outblock.sock = inblock.sock;
3006 outblock.buffersize = sizeof(outbuffer);
3007 outblock.buffer = outbuffer;
3008 outblock.ptr = outbuffer;
3009 outblock.cmd_count = 0;
3010 outblock.authenticating = FALSE;
3011
3012 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3013 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3014 ob->command_timeout);
3015 (void)close(inblock.sock);
3016 }
3017
3018
3019
3020 /*************************************************
3021 * Prepare addresses for delivery *
3022 *************************************************/
3023
3024 /* This function is called to flush out error settings from previous delivery
3025 attempts to other hosts. It also records whether we got here via an MX record
3026 or not in the more_errno field of the address. We are interested only in
3027 addresses that are still marked DEFER - others may have got delivered to a
3028 previously considered IP address. Set their status to PENDING_DEFER to indicate
3029 which ones are relevant this time.
3030
3031 Arguments:
3032 addrlist the list of addresses
3033 host the host we are delivering to
3034
3035 Returns: the first address for this delivery
3036 */
3037
3038 static address_item *
3039 prepare_addresses(address_item *addrlist, host_item *host)
3040 {
3041 address_item *first_addr = NULL;
3042 address_item *addr;
3043 for (addr = addrlist; addr != NULL; addr = addr->next)
3044 if (addr->transport_return == DEFER)
3045 {
3046 if (first_addr == NULL) first_addr = addr;
3047 addr->transport_return = PENDING_DEFER;
3048 addr->basic_errno = 0;
3049 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3050 addr->message = NULL;
3051 #ifdef SUPPORT_TLS
3052 addr->cipher = NULL;
3053 addr->ourcert = NULL;
3054 addr->peercert = NULL;
3055 addr->peerdn = NULL;
3056 addr->ocsp = OCSP_NOT_REQ;
3057 #endif
3058 #ifdef EXPERIMENTAL_DSN_INFO
3059 addr->smtp_greeting = NULL;
3060 addr->helo_response = NULL;
3061 #endif
3062 }
3063 return first_addr;
3064 }
3065
3066
3067
3068 /*************************************************
3069 * Main entry point *
3070 *************************************************/
3071
3072 /* See local README for interface details. As this is a remote transport, it is
3073 given a chain of addresses to be delivered in one connection, if possible. It
3074 always returns TRUE, indicating that each address has its own independent
3075 status set, except if there is a setting up problem, in which case it returns
3076 FALSE. */
3077
3078 BOOL
3079 smtp_transport_entry(
3080 transport_instance *tblock, /* data for this instantiation */
3081 address_item *addrlist) /* addresses we are working on */
3082 {
3083 int cutoff_retry;
3084 int port;
3085 int hosts_defer = 0;
3086 int hosts_fail = 0;
3087 int hosts_looked_up = 0;
3088 int hosts_retry = 0;
3089 int hosts_serial = 0;
3090 int hosts_total = 0;
3091 int total_hosts_tried = 0;
3092 address_item *addr;
3093 BOOL expired = TRUE;
3094 BOOL continuing = continue_hostname != NULL;
3095 uschar *expanded_hosts = NULL;
3096 uschar *pistring;
3097 uschar *tid = string_sprintf("%s transport", tblock->name);
3098 smtp_transport_options_block *ob =
3099 (smtp_transport_options_block *)(tblock->options_block);
3100 host_item *hostlist = addrlist->host_list;
3101 host_item *host = NULL;
3102
3103 DEBUG(D_transport)
3104 {
3105 debug_printf("%s transport entered\n", tblock->name);
3106 for (addr = addrlist; addr != NULL; addr = addr->next)
3107 debug_printf(" %s\n", addr->address);
3108 if (continuing) debug_printf("already connected to %s [%s]\n",
3109 continue_hostname, continue_host_address);
3110 }
3111
3112 /* Set the flag requesting that these hosts be added to the waiting
3113 database if the delivery fails temporarily or if we are running with
3114 queue_smtp or a 2-stage queue run. This gets unset for certain
3115 kinds of error, typically those that are specific to the message. */
3116
3117 update_waiting = TRUE;
3118
3119 /* If a host list is not defined for the addresses - they must all have the
3120 same one in order to be passed to a single transport - or if the transport has
3121 a host list with hosts_override set, use the host list supplied with the
3122 transport. It is an error for this not to exist. */
3123
3124 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3125 {
3126 if (ob->hosts == NULL)
3127 {
3128 addrlist->message = string_sprintf("%s transport called with no hosts set",
3129 tblock->name);
3130 addrlist->transport_return = PANIC;
3131 return FALSE; /* Only top address has status */
3132 }
3133
3134 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3135 ob->hosts);
3136
3137 /* If the transport's host list contains no '$' characters, and we are not
3138 randomizing, it is fixed and therefore a chain of hosts can be built once
3139 and for all, and remembered for subsequent use by other calls to this
3140 transport. If, on the other hand, the host list does contain '$', or we are
3141 randomizing its order, we have to rebuild it each time. In the fixed case,
3142 as the hosts string will never be used again, it doesn't matter that we
3143 replace all the : characters with zeros. */
3144
3145 if (ob->hostlist == NULL)
3146 {
3147 uschar *s = ob->hosts;
3148
3149 if (Ustrchr(s, '$') != NULL)
3150 {
3151 if (!(expanded_hosts = expand_string(s)))
3152 {
3153 addrlist->message = string_sprintf("failed to expand list of hosts "
3154 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3155 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3156 return FALSE; /* Only top address has status */
3157 }
3158 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3159 "\"%s\"\n", s, expanded_hosts);
3160 s = expanded_hosts;
3161 }
3162 else
3163 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3164
3165 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3166
3167 /* Check that the expansion yielded something useful. */
3168 if (hostlist == NULL)
3169 {
3170 addrlist->message =
3171 string_sprintf("%s transport has empty hosts setting", tblock->name);
3172 addrlist->transport_return = PANIC;
3173 return FALSE; /* Only top address has status */
3174 }
3175
3176 /* If there was no expansion of hosts, save the host list for
3177 next time. */
3178
3179 if (!expanded_hosts) ob->hostlist = hostlist;
3180 }
3181
3182 /* This is not the first time this transport has been run in this delivery;
3183 the host list was built previously. */
3184
3185 else
3186 hostlist = ob->hostlist;
3187 }
3188
3189 /* The host list was supplied with the address. If hosts_randomize is set, we
3190 must sort it into a random order if it did not come from MX records and has not
3191 already been randomized (but don't bother if continuing down an existing
3192 connection). */
3193
3194 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3195 {
3196 host_item *newlist = NULL;
3197 while (hostlist != NULL)
3198 {
3199 host_item *h = hostlist;
3200 hostlist = hostlist->next;
3201
3202 h->sort_key = random_number(100);
3203
3204 if (newlist == NULL)
3205 {
3206 h->next = NULL;
3207 newlist = h;
3208 }
3209 else if (h->sort_key < newlist->sort_key)
3210 {
3211 h->next = newlist;
3212 newlist = h;
3213 }
3214 else
3215 {
3216 host_item *hh = newlist;
3217 while (hh->next != NULL)
3218 {
3219 if (h->sort_key < hh->next->sort_key) break;
3220 hh = hh->next;
3221 }
3222 h->next = hh->next;
3223 hh->next = h;
3224 }
3225 }
3226
3227 hostlist = addrlist->host_list = newlist;
3228 }
3229
3230 /* Sort out the default port. */
3231
3232 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3233
3234 /* For each host-plus-IP-address on the list:
3235
3236 . If this is a continued delivery and the host isn't the one with the
3237 current connection, skip.
3238
3239 . If the status is unusable (i.e. previously failed or retry checked), skip.
3240
3241 . If no IP address set, get the address, either by turning the name into
3242 an address, calling gethostbyname if gethostbyname is on, or by calling
3243 the DNS. The DNS may yield multiple addresses, in which case insert the
3244 extra ones into the list.
3245
3246 . Get the retry data if not previously obtained for this address and set the
3247 field which remembers the state of this address. Skip if the retry time is
3248 not reached. If not, remember whether retry data was found. The retry string
3249 contains both the name and the IP address.
3250
3251 . Scan the list of addresses and mark those whose status is DEFER as
3252 PENDING_DEFER. These are the only ones that will be processed in this cycle
3253 of the hosts loop.
3254
3255 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3256 Some addresses may be successfully delivered, others may fail, and yet
3257 others may get temporary errors and so get marked DEFER.
3258
3259 . The return from the delivery attempt is OK if a connection was made and a
3260 valid SMTP dialogue was completed. Otherwise it is DEFER.
3261
3262 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3263
3264 . If fail to connect, or other defer state, add a retry item.
3265
3266 . If there are any addresses whose status is still DEFER, carry on to the
3267 next host/IPaddress, unless we have tried the number of hosts given
3268 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3269 there is some fancy logic for hosts_max_try that means its limit can be
3270 overstepped in some circumstances.
3271
3272 If we get to the end of the list, all hosts have deferred at least one address,
3273 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3274 delivery attempt to those hosts whose last try was before the arrival time of
3275 the current message. To cope with this, we have to go round the loop a second
3276 time. After that, set the status and error data for any addresses that haven't
3277 had it set already. */
3278
3279 for (cutoff_retry = 0; expired &&
3280 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3281 cutoff_retry++)
3282 {
3283 host_item *nexthost = NULL;
3284 int unexpired_hosts_tried = 0;
3285
3286 for (host = hostlist;
3287 host != NULL &&
3288 unexpired_hosts_tried < ob->hosts_max_try &&
3289 total_hosts_tried < ob->hosts_max_try_hardlimit;
3290 host = nexthost)
3291 {
3292 int rc;
3293 int host_af;
3294 uschar *rs;
3295 BOOL serialized = FALSE;
3296 BOOL host_is_expired = FALSE;
3297 BOOL message_defer = FALSE;
3298 BOOL some_deferred = FALSE;
3299 address_item *first_addr = NULL;
3300 uschar *interface = NULL;
3301 uschar *retry_host_key = NULL;
3302 uschar *retry_message_key = NULL;
3303 uschar *serialize_key = NULL;
3304
3305 /* Default next host is next host. :-) But this can vary if the
3306 hosts_max_try limit is hit (see below). It may also be reset if a host
3307 address is looked up here (in case the host was multihomed). */
3308
3309 nexthost = host->next;
3310
3311 /* If the address hasn't yet been obtained from the host name, look it up
3312 now, unless the host is already marked as unusable. If it is marked as
3313 unusable, it means that the router was unable to find its IP address (in
3314 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3315 the lookup failed last time. We don't get this far if *all* MX records
3316 point to non-existent hosts; that is treated as a hard error.
3317
3318 We can just skip this host entirely. When the hosts came from the router,
3319 the address will timeout based on the other host(s); when the address is
3320 looked up below, there is an explicit retry record added.
3321
3322 Note that we mustn't skip unusable hosts if the address is not unset; they
3323 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3324
3325 if (host->address == NULL)
3326 {
3327 int new_port, flags;
3328 host_item *hh;
3329
3330 if (host->status >= hstatus_unusable)
3331 {
3332 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3333 host->name);
3334 continue;
3335 }
3336
3337 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3338
3339 /* The host name is permitted to have an attached port. Find it, and
3340 strip it from the name. Just remember it for now. */
3341
3342 new_port = host_item_get_port(host);
3343
3344 /* Count hosts looked up */
3345
3346 hosts_looked_up++;
3347
3348 /* Find by name if so configured, or if it's an IP address. We don't
3349 just copy the IP address, because we need the test-for-local to happen. */
3350
3351 flags = HOST_FIND_BY_A;
3352 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3353 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3354
3355 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3356 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3357 else
3358 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3359 &ob->dnssec, /* domains for request/require */
3360 NULL, NULL);
3361
3362 /* Update the host (and any additional blocks, resulting from
3363 multihoming) with a host-specific port, if any. */
3364
3365 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3366
3367 /* Failure to find the host at this time (usually DNS temporary failure)
3368 is really a kind of routing failure rather than a transport failure.
3369 Therefore we add a retry item of the routing kind, not to stop us trying
3370 to look this name up here again, but to ensure the address gets timed
3371 out if the failures go on long enough. A complete failure at this point
3372 commonly points to a configuration error, but the best action is still
3373 to carry on for the next host. */
3374
3375 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3376 {
3377 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3378 expired = FALSE;
3379 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3380 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3381 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3382 host->status = hstatus_unusable;
3383
3384 for (addr = addrlist; addr != NULL; addr = addr->next)
3385 {
3386 if (addr->transport_return != DEFER) continue;
3387 addr->basic_errno = ERRNO_UNKNOWNHOST;
3388 addr->message =
3389 string_sprintf("failed to lookup IP address for %s", host->name);
3390 }
3391 continue;
3392 }
3393
3394 /* If the host is actually the local host, we may have a problem, or
3395 there may be some cunning configuration going on. In the problem case,
3396 log things and give up. The default transport status is already DEFER. */
3397
3398 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3399 {
3400 for (addr = addrlist; addr != NULL; addr = addr->next)
3401 {
3402 addr->basic_errno = 0;
3403 addr->message = string_sprintf("%s transport found host %s to be "
3404 "local", tblock->name, host->name);
3405 }
3406 goto END_TRANSPORT;
3407 }
3408 } /* End of block for IP address lookup */
3409
3410 /* If this is a continued delivery, we are interested only in the host
3411 which matches the name of the existing open channel. The check is put
3412 here after the local host lookup, in case the name gets expanded as a
3413 result of the lookup. Set expired FALSE, to save the outer loop executing
3414 twice. */
3415
3416 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3417 Ustrcmp(continue_host_address, host->address) != 0))
3418 {
3419 expired = FALSE;
3420 continue; /* With next host */
3421 }
3422
3423 /* Reset the default next host in case a multihomed host whose addresses
3424 are not looked up till just above added to the host list. */
3425
3426 nexthost = host->next;
3427
3428 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3429 domain is in queue_smtp_domains, we don't actually want to attempt any
3430 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3431 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3432 were not in it. We don't want to hold up all SMTP deliveries! Except when
3433 doing a two-stage queue run, don't do this if forcing. */
3434
3435 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3436 match_isinlist(addrlist->domain,
3437 (const uschar **)&queue_smtp_domains, 0,
3438 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3439 {
3440 expired = FALSE;
3441 for (addr = addrlist; addr != NULL; addr = addr->next)
3442 {
3443 if (addr->transport_return != DEFER) continue;
3444 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3445 }
3446 continue; /* With next host */
3447 }
3448
3449 /* Count hosts being considered - purely for an intelligent comment
3450 if none are usable. */
3451
3452 hosts_total++;
3453
3454 /* Set $host and $host address now in case they are needed for the
3455 interface expansion or the serialize_hosts check; they remain set if an
3456 actual delivery happens. */
3457
3458 deliver_host = host->name;
3459 deliver_host_address = host->address;
3460 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3461 : host->dnssec == DS_NO ? US"no"
3462 : US"";
3463
3464 /* Set up a string for adding to the retry key if the port number is not
3465 the standard SMTP port. A host may have its own port setting that overrides
3466 the default. */
3467
3468 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3469 port : host->port);
3470 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3471
3472 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3473 string is set, even if constant (as different transports can have different
3474 constant settings), we must add it to the key that is used for retries,
3475 because connections to the same host from a different interface should be
3476 treated separately. */
3477
3478 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3479 if ((rs = ob->interface) && *rs)
3480 {
3481 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3482 return FALSE;
3483 pistring = string_sprintf("%s/%s", pistring, interface);
3484 }
3485
3486 /* The first time round the outer loop, check the status of the host by
3487 inspecting the retry data. The second time round, we are interested only
3488 in expired hosts that haven't been tried since this message arrived. */
3489
3490 if (cutoff_retry == 0)
3491 {
3492 BOOL incl_ip;
3493 /* Ensure the status of the address is set by checking retry data if
3494 necessary. There may be host-specific retry data (applicable to all
3495 messages) and also data for retries of a specific message at this host.
3496 If either of these retry records are actually read, the keys used are
3497 returned to save recomputing them later. */
3498
3499 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3500 US"retry_include_ip_address", ob->retry_include_ip_address,
3501 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3502 continue; /* with next host */
3503
3504 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3505 incl_ip, &retry_host_key, &retry_message_key);
3506
3507 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3508 (host->address == NULL)? US"" : host->address, pistring,
3509 (host->status == hstatus_usable)? "usable" :
3510 (host->status == hstatus_unusable)? "unusable" :
3511 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3512
3513 /* Skip this address if not usable at this time, noting if it wasn't
3514 actually expired, both locally and in the address. */
3515
3516 switch (host->status)
3517 {
3518 case hstatus_unusable:
3519 expired = FALSE;
3520 setflag(addrlist, af_retry_skipped);
3521 /* Fall through */
3522
3523 case hstatus_unusable_expired:
3524 switch (host->why)
3525 {
3526 case hwhy_retry: hosts_retry++; break;
3527 case hwhy_failed: hosts_fail++; break;
3528 case hwhy_deferred: hosts_defer++; break;
3529 }
3530
3531 /* If there was a retry message key, implying that previously there
3532 was a message-specific defer, we don't want to update the list of
3533 messages waiting for these hosts. */
3534
3535 if (retry_message_key != NULL) update_waiting = FALSE;
3536 continue; /* With the next host or IP address */
3537 }
3538 }
3539
3540 /* Second time round the loop: if the address is set but expired, and
3541 the message is newer than the last try, let it through. */
3542
3543 else
3544 {
3545 if (host->address == NULL ||
3546 host->status != hstatus_unusable_expired ||
3547 host->last_try > received_time)
3548 continue;
3549 DEBUG(D_transport)
3550 debug_printf("trying expired host %s [%s]%s\n",
3551 host->name, host->address, pistring);
3552 host_is_expired = TRUE;
3553 }
3554
3555 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3556 it remains TRUE only if all hosts are expired and none are actually tried.
3557 */
3558
3559 expired = FALSE;
3560
3561 /* If this host is listed as one to which access must be serialized,
3562 see if another Exim process has a connection to it, and if so, skip
3563 this host. If not, update the database to record our connection to it
3564 and remember this for later deletion. Do not do any of this if we are
3565 sending the message down a pre-existing connection. */
3566
3567 if (!continuing &&
3568 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3569 {
3570 serialize_key = string_sprintf("host-serialize-%s", host->name);
3571 if (!enq_start(serialize_key, 1))
3572 {
3573 DEBUG(D_transport)
3574 debug_printf("skipping host %s because another Exim process "
3575 "is connected to it\n", host->name);
3576 hosts_serial++;
3577 continue;
3578 }
3579 serialized = TRUE;
3580 }
3581
3582 /* OK, we have an IP address that is not waiting for its retry time to
3583 arrive (it might be expired) OR (second time round the loop) we have an
3584 expired host that hasn't been tried since the message arrived. Have a go
3585 at delivering the message to it. First prepare the addresses by flushing
3586 out the result of previous attempts, and finding the first address that
3587 is still to be delivered. */
3588
3589 first_addr = prepare_addresses(addrlist, host);
3590
3591 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3592 message_id, host->name, host->address, addrlist->address,
3593 (addrlist->next == NULL)? "" : ", ...");
3594
3595 set_process_info("delivering %s to %s [%s] (%s%s)",
3596 message_id, host->name, host->address, addrlist->address,
3597 (addrlist->next == NULL)? "" : ", ...");
3598
3599 /* This is not for real; don't do the delivery. If there are
3600 any remaining hosts, list them. */
3601
3602 if (dont_deliver)
3603 {
3604 host_item *host2;
3605 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3606 for (addr = addrlist; addr != NULL; addr = addr->next)
3607 {
3608 addr->host_used = host;
3609 addr->special_action = '*';
3610 addr->message = US"delivery bypassed by -N option";
3611 }
3612 DEBUG(D_transport)
3613 {
3614 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3615 "*** host and remaining hosts:\n", tblock->name);
3616 for (host2 = host; host2 != NULL; host2 = host2->next)
3617 debug_printf(" %s [%s]\n", host2->name,
3618 (host2->address == NULL)? US"unset" : host2->address);
3619 }
3620 rc = OK;
3621 }
3622
3623 /* This is for real. If the host is expired, we don't count it for
3624 hosts_max_retry. This ensures that all hosts must expire before an address
3625 is timed out, unless hosts_max_try_hardlimit (which protects against
3626 lunatic DNS configurations) is reached.
3627
3628 If the host is not expired and we are about to hit the hosts_max_retry
3629 limit, check to see if there is a subsequent hosts with a different MX
3630 value. If so, make that the next host, and don't count this one. This is a
3631 heuristic to make sure that different MXs do get tried. With a normal kind
3632 of retry rule, they would get tried anyway when the earlier hosts were
3633 delayed, but if the domain has a "retry every time" type of rule - as is
3634 often used for the the very large ISPs, that won't happen. */
3635
3636 else
3637 {
3638 host_item * thost;
3639 /* Make a copy of the host if it is local to this invocation
3640 of the transport. */
3641
3642 if (expanded_hosts)
3643 {
3644 thost = store_get(sizeof(host_item));
3645 *thost = *host;
3646 thost->name = string_copy(host->name);
3647 thost->address = string_copy(host->address);
3648 }
3649 else
3650 thost = host;
3651
3652 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3653 {
3654 host_item *h;
3655 DEBUG(D_transport)
3656 debug_printf("hosts_max_try limit reached with this host\n");
3657 for (h = host; h; h = h->next) if (h->mx != host->mx)
3658 {
3659 nexthost = h;
3660 unexpired_hosts_tried--;
3661 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3662 "and will be tried\n");
3663 break;
3664 }
3665 }
3666
3667 /* Attempt the delivery. */
3668
3669 total_hosts_tried++;
3670 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3671 &message_defer, FALSE);
3672
3673 /* Yield is one of:
3674 OK => connection made, each address contains its result;
3675 message_defer is set for message-specific defers (when all
3676 recipients are marked defer)
3677 DEFER => there was a non-message-specific delivery problem;
3678 ERROR => there was a problem setting up the arguments for a filter,
3679 or there was a problem with expanding added headers
3680 */
3681
3682 /* If the result is not OK, there was a non-message-specific problem.
3683 If the result is DEFER, we need to write to the logs saying what happened
3684 for this particular host, except in the case of authentication and TLS
3685 failures, where the log has already been written. If all hosts defer a
3686 general message is written at the end. */
3687
3688 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3689 first_addr->basic_errno != ERRNO_TLSFAILURE)
3690 write_logs(first_addr, host);
3691
3692 #ifndef DISABLE_EVENT
3693 if (rc == DEFER)
3694 deferred_event_raise(first_addr, host);
3695 #endif
3696
3697 /* If STARTTLS was accepted, but there was a failure in setting up the
3698 TLS session (usually a certificate screwup), and the host is not in
3699 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3700 TLS forcibly turned off. We have to start from scratch with a new SMTP
3701 connection. That's why the retry is done from here, not from within
3702 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3703 session, so the in-clear transmission after those errors, if permitted,
3704 happens inside smtp_deliver().] */
3705
3706 #ifdef SUPPORT_TLS
3707 if ( rc == DEFER
3708 && first_addr->basic_errno == ERRNO_TLSFAILURE
3709 && ob->tls_tempfail_tryclear
3710 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3711 )
3712 {
3713 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3714 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3715 first_addr = prepare_addresses(addrlist, host);
3716 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3717 &message_defer, TRUE);
3718 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3719 write_logs(first_addr, host);
3720 # ifndef DISABLE_EVENT
3721 if (rc == DEFER)
3722 deferred_event_raise(first_addr, host);
3723 # endif
3724 }
3725 #endif /*SUPPORT_TLS*/
3726 }
3727
3728 /* Delivery attempt finished */
3729
3730 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3731 US"ERROR" : US"?";
3732
3733 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3734 message_id, host->name, host->address, addrlist->address,
3735 (addrlist->next == NULL)? "" : " (& others)", rs);
3736
3737 /* Release serialization if set up */
3738
3739 if (serialized) enq_end(serialize_key);
3740
3741 /* If the result is DEFER, or if a host retry record is known to exist, we
3742 need to add an item to the retry chain for updating the retry database
3743 at the end of delivery. We only need to add the item to the top address,
3744 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3745 for any other delivery attempts using the same address. (It is copied into
3746 the unusable tree at the outer level, so even if different address blocks
3747 contain the same address, it still won't get tried again.) */
3748
3749 if (rc == DEFER || retry_host_key != NULL)
3750 {
3751 int delete_flag = (rc != DEFER)? rf_delete : 0;
3752 if (retry_host_key == NULL)
3753 {
3754 BOOL incl_ip;
3755 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3756 US"retry_include_ip_address", ob->retry_include_ip_address,
3757 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3758 incl_ip = TRUE; /* error; use most-specific retry record */
3759
3760 retry_host_key = incl_ip ?
3761 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3762 string_sprintf("T:%S%s", host->name, pistring);
3763 }
3764
3765 /* If a delivery of another message over an existing SMTP connection
3766 yields DEFER, we do NOT set up retry data for the host. This covers the
3767 case when there are delays in routing the addresses in the second message
3768 that are so long that the server times out. This is alleviated by not
3769 routing addresses that previously had routing defers when handling an
3770 existing connection, but even so, this case may occur (e.g. if a
3771 previously happily routed address starts giving routing defers). If the
3772 host is genuinely down, another non-continued message delivery will
3773 notice it soon enough. */
3774
3775 if (delete_flag != 0 || !continuing)
3776 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3777
3778 /* We may have tried an expired host, if its retry time has come; ensure
3779 the status reflects the expiry for the benefit of any other addresses. */
3780
3781 if (rc == DEFER)
3782 {
3783 host->status = (host_is_expired)?
3784 hstatus_unusable_expired : hstatus_unusable;
3785 host->why = hwhy_deferred;
3786 }
3787 }
3788
3789 /* If message_defer is set (host was OK, but every recipient got deferred
3790 because of some message-specific problem), or if that had happened
3791 previously so that a message retry key exists, add an appropriate item
3792 to the retry chain. Note that if there was a message defer but now there is
3793 a host defer, the message defer record gets deleted. That seems perfectly
3794 reasonable. Also, stop the message from being remembered as waiting
3795 for specific hosts. */
3796
3797 if (message_defer || retry_message_key != NULL)
3798 {
3799 int delete_flag = message_defer? 0 : rf_delete;
3800 if (retry_message_key == NULL)
3801 {
3802 BOOL incl_ip;
3803 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3804 US"retry_include_ip_address", ob->retry_include_ip_address,
3805 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3806 incl_ip = TRUE; /* error; use most-specific retry record */
3807
3808 retry_message_key = incl_ip ?
3809 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3810 message_id) :
3811 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3812 }
3813 retry_add_item(addrlist, retry_message_key,
3814 rf_message | rf_host | delete_flag);
3815 update_waiting = FALSE;
3816 }
3817
3818 /* Any return other than DEFER (that is, OK or ERROR) means that the
3819 addresses have got their final statuses filled in for this host. In the OK
3820 case, see if any of them are deferred. */
3821
3822 if (rc == OK)
3823 for (addr = addrlist; addr; addr = addr->next)
3824 if (addr->transport_return == DEFER)
3825 {
3826 some_deferred = TRUE;
3827 break;
3828 }
3829
3830 /* If no addresses deferred or the result was ERROR, return. We do this for
3831 ERROR because a failing filter set-up or add_headers expansion is likely to
3832 fail for any host we try. */
3833
3834 if (rc == ERROR || (rc == OK && !some_deferred))
3835 {
3836 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3837 return TRUE; /* Each address has its status */
3838 }
3839
3840 /* If the result was DEFER or some individual addresses deferred, let
3841 the loop run to try other hosts with the deferred addresses, except for the
3842 case when we were trying to deliver down an existing channel and failed.
3843 Don't try any other hosts in this case. */
3844
3845 if (continuing) break;
3846
3847 /* If the whole delivery, or some individual addresses, were deferred and
3848 there are more hosts that could be tried, do not count this host towards
3849 the hosts_max_try limit if the age of the message is greater than the
3850 maximum retry time for this host. This means we may try try all hosts,
3851 ignoring the limit, when messages have been around for some time. This is
3852 important because if we don't try all hosts, the address will never time
3853 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3854
3855 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3856 {
3857 BOOL timedout;
3858 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3859
3860 if (retry != NULL && retry->rules != NULL)
3861 {
3862 retry_rule *last_rule;
3863 for (last_rule = retry->rules;
3864 last_rule->next != NULL;
3865 last_rule = last_rule->next);
3866 timedout = time(NULL) - received_time > last_rule->timeout;
3867 }
3868 else timedout = TRUE; /* No rule => timed out */
3869
3870 if (timedout)
3871 {
3872 unexpired_hosts_tried--;
3873 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3874 "hosts_max_try (message older than host's retry time)\n");
3875 }
3876 }
3877 } /* End of loop for trying multiple hosts. */
3878
3879 /* This is the end of the loop that repeats iff expired is TRUE and
3880 ob->delay_after_cutoff is FALSE. The second time round we will
3881 try those hosts that haven't been tried since the message arrived. */
3882
3883 DEBUG(D_transport)
3884 {
3885 debug_printf("all IP addresses skipped or deferred at least one address\n");
3886 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3887 debug_printf("retrying IP addresses not tried since message arrived\n");
3888 }
3889 }
3890
3891
3892 /* Get here if all IP addresses are skipped or defer at least one address. In
3893 MUA wrapper mode, this will happen only for connection or other non-message-
3894 specific failures. Force the delivery status for all addresses to FAIL. */
3895
3896 if (mua_wrapper)
3897 {
3898 for (addr = addrlist; addr != NULL; addr = addr->next)
3899 addr->transport_return = FAIL;
3900 goto END_TRANSPORT;
3901 }
3902
3903 /* In the normal, non-wrapper case, add a standard message to each deferred
3904 address if there hasn't been an error, that is, if it hasn't actually been
3905 tried this time. The variable "expired" will be FALSE if any deliveries were
3906 actually tried, or if there was at least one host that was not expired. That
3907 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3908 a delivery has been tried, an error code will be set, and the failing of the
3909 message is handled by the retry code later.
3910
3911 If queue_smtp is set, or this transport was called to send a subsequent message
3912 down an existing TCP/IP connection, and something caused the host not to be
3913 found, we end up here, but can detect these cases and handle them specially. */
3914
3915 for (addr = addrlist; addr != NULL; addr = addr->next)
3916 {
3917 /* If host is not NULL, it means that we stopped processing the host list
3918 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3919 means we need to behave as if some hosts were skipped because their retry
3920 time had not come. Specifically, this prevents the address from timing out.
3921 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3922 hosts were tried. */
3923
3924 if (host != NULL)
3925 {
3926 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3927 {
3928 DEBUG(D_transport)
3929 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3930 "hosts were tried\n");
3931 }
3932 else
3933 {
3934 DEBUG(D_transport)
3935 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3936 setflag(addr, af_retry_skipped);
3937 }
3938 }
3939
3940 if (queue_smtp) /* no deliveries attempted */
3941 {
3942 addr->transport_return = DEFER;
3943 addr->basic_errno = 0;
3944 addr->message = US"SMTP delivery explicitly queued";
3945 }
3946
3947 else if (addr->transport_return == DEFER &&
3948 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3949 addr->message == NULL)
3950 {
3951 addr->basic_errno = ERRNO_HRETRY;
3952 if (continue_hostname != NULL)
3953 {
3954 addr->message = US"no host found for existing SMTP connection";
3955 }
3956 else if (expired)
3957 {
3958 setflag(addr, af_pass_message); /* This is not a security risk */
3959 addr->message = ob->delay_after_cutoff
3960 ? US"retry time not reached for any host after a long failure period"
3961 : US"all hosts have been failing for a long time and were last tried "
3962 "after this message arrived";
3963
3964 /* If we are already using fallback hosts, or there are no fallback hosts
3965 defined, convert the result to FAIL to cause a bounce. */
3966
3967 if (addr->host_list == addr->fallback_hosts ||
3968 addr->fallback_hosts == NULL)
3969 addr->transport_return = FAIL;
3970 }
3971 else
3972 {
3973 const char * s;
3974 if (hosts_retry == hosts_total)
3975 s = "retry time not reached for any host%s";
3976 else if (hosts_fail == hosts_total)
3977 s = "all host address lookups%s failed permanently";
3978 else if (hosts_defer == hosts_total)
3979 s = "all host address lookups%s failed temporarily";
3980 else if (hosts_serial == hosts_total)
3981 s = "connection limit reached for all hosts%s";
3982 else if (hosts_fail+hosts_defer == hosts_total)
3983 s = "all host address lookups%s failed";
3984 else
3985 s = "some host address lookups failed and retry time "
3986 "not reached for other hosts or connection limit reached%s";
3987
3988 addr->message = string_sprintf(s,
3989 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3990 }
3991 }
3992 }
3993
3994 /* Update the database which keeps information about which messages are waiting
3995 for which hosts to become available. For some message-specific errors, the
3996 update_waiting flag is turned off because we don't want follow-on deliveries in
3997 those cases. If this transport instance is explicitly limited to one message
3998 per connection then follow-on deliveries are not possible and there's no need
3999 to create/update the per-transport wait-<transport_name> database. */
4000
4001 if (update_waiting && tblock->connection_max_messages != 1)
4002 transport_update_waiting(hostlist, tblock->name);
4003
4004 END_TRANSPORT:
4005
4006 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4007
4008 return TRUE; /* Each address has its status */
4009 }
4010
4011 /* vi: aw ai sw=2
4012 */
4013 /* End of transport/smtp.c */
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