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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #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,
1220 BOOL dane_required, BOOL * dane)
1221 {
1222 /* move this out to host.c given the similarity to dns_lookup() ? */
1223 uschar buffer[300];
1224 const uschar * fullname = buffer;
1225
1226 /* TLSA lookup string */
1227 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1228
1229 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1230 {
1231 case DNS_AGAIN:
1232 return DEFER; /* just defer this TLS'd conn */
1233
1234 default:
1235 case DNS_FAIL:
1236 if (dane_required)
1237 return FAIL;
1238 break;
1239
1240 case DNS_SUCCEED:
1241 if (!dns_is_secure(dnsa))
1242 {
1243 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1244 return DEFER;
1245 }
1246 *dane = TRUE;
1247 break;
1248 }
1249 return OK;
1250 }
1251 #endif
1252
1253
1254
1255 typedef struct smtp_compare_s
1256 {
1257 uschar *current_sender_address;
1258 struct transport_instance *tblock;
1259 } smtp_compare_t;
1260
1261 /*
1262 Create a unique string that identifies this message, it is based on
1263 sender_address, helo_data and tls_certificate if enabled. */
1264
1265 static uschar *
1266 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1267 {
1268 address_item * addr1;
1269 uschar * if1 = US"";
1270 uschar * helo1 = US"";
1271 #ifdef SUPPORT_TLS
1272 uschar * tlsc1 = US"";
1273 #endif
1274 uschar * save_sender_address = sender_address;
1275 uschar * local_identity = NULL;
1276 smtp_transport_options_block * ob =
1277 (smtp_transport_options_block *)tblock->options_block;
1278
1279 sender_address = sender;
1280
1281 addr1 = deliver_make_addr (sender, TRUE);
1282 deliver_set_expansions(addr1);
1283
1284 if (ob->interface)
1285 if1 = expand_string(ob->interface);
1286
1287 if (ob->helo_data)
1288 helo1 = expand_string(ob->helo_data);
1289
1290 #ifdef SUPPORT_TLS
1291 if (ob->tls_certificate)
1292 tlsc1 = expand_string(ob->tls_certificate);
1293 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1294 #else
1295 local_identity = string_sprintf ("%s^%s", if1, helo1);
1296 #endif
1297
1298 deliver_set_expansions(NULL);
1299 sender_address = save_sender_address;
1300
1301 return local_identity;
1302 }
1303
1304
1305
1306 /* This routine is a callback that is called from transport_check_waiting.
1307 This function will evaluate the incoming message versus the previous
1308 message. If the incoming message is using a different local identity then
1309 we will veto this new message. */
1310
1311 static BOOL
1312 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1313 {
1314
1315 uschar * message_local_identity,
1316 * current_local_identity,
1317 * new_sender_address;
1318
1319 current_local_identity =
1320 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1321
1322 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1323 return 0;
1324
1325 message_local_identity =
1326 smtp_local_identity(new_sender_address, s_compare->tblock);
1327
1328 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1329 }
1330
1331
1332
1333 uschar
1334 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1335 {
1336 #ifdef SUPPORT_TLS
1337 if (checks & PEER_OFFERED_TLS)
1338 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~PEER_OFFERED_TLS;
1340 #endif
1341
1342 if ( checks & PEER_OFFERED_IGNQ
1343 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1344 PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_IGNQ;
1346
1347 #ifndef DISABLE_PRDR
1348 if ( checks & PEER_OFFERED_PRDR
1349 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_PRDR;
1351 #endif
1352
1353 #ifdef SUPPORT_I18N
1354 if ( checks & PEER_OFFERED_UTF8
1355 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~PEER_OFFERED_UTF8;
1357 #endif
1358
1359 if ( checks & PEER_OFFERED_DSN
1360 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1361 checks &= ~PEER_OFFERED_DSN;
1362
1363 if ( checks & PEER_OFFERED_PIPE
1364 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1365 PCRE_EOPT, NULL, 0) < 0)
1366 checks &= ~PEER_OFFERED_PIPE;
1367
1368 if ( checks & PEER_OFFERED_SIZE
1369 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~PEER_OFFERED_SIZE;
1371
1372 return checks;
1373 }
1374
1375
1376 /*************************************************
1377 * Deliver address list to given host *
1378 *************************************************/
1379
1380 /* If continue_hostname is not null, we get here only when continuing to
1381 deliver down an existing channel. The channel was passed as the standard
1382 input. TLS is never active on a passed channel; the previous process always
1383 closes it down before passing the connection on.
1384
1385 Otherwise, we have to make a connection to the remote host, and do the
1386 initial protocol exchange.
1387
1388 When running as an MUA wrapper, if the sender or any recipient is rejected,
1389 temporarily or permanently, we force failure for all recipients.
1390
1391 Arguments:
1392 addrlist chain of potential addresses to deliver; only those whose
1393 transport_return field is set to PENDING_DEFER are currently
1394 being processed; others should be skipped - they have either
1395 been delivered to an earlier host or IP address, or been
1396 failed by one of them.
1397 host host to deliver to
1398 host_af AF_INET or AF_INET6
1399 port default TCP/IP port to use, in host byte order
1400 interface interface to bind to, or NULL
1401 tblock transport instance block
1402 message_defer set TRUE if yield is OK, but all addresses were deferred
1403 because of a non-recipient, non-host failure, that is, a
1404 4xx response to MAIL FROM, DATA, or ".". This is a defer
1405 that is specific to the message.
1406 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1407 a second attempt after TLS initialization fails
1408
1409 Returns: OK - the connection was made and the delivery attempted;
1410 the result for each address is in its data block.
1411 DEFER - the connection could not be made, or something failed
1412 while setting up the SMTP session, or there was a
1413 non-message-specific error, such as a timeout.
1414 ERROR - a filter command is specified for this transport,
1415 and there was a problem setting it up; OR helo_data
1416 or add_headers or authenticated_sender is specified
1417 for this transport, and the string failed to expand
1418 */
1419
1420 static int
1421 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1422 uschar *interface, transport_instance *tblock,
1423 BOOL *message_defer, BOOL suppress_tls)
1424 {
1425 address_item *addr;
1426 address_item *sync_addr;
1427 address_item *first_addr = addrlist;
1428 int yield = OK;
1429 int address_count;
1430 int save_errno;
1431 int rc;
1432 time_t start_delivery_time = time(NULL);
1433 smtp_transport_options_block *ob =
1434 (smtp_transport_options_block *)(tblock->options_block);
1435 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1436 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1437 BOOL ok = FALSE;
1438 BOOL send_rset = TRUE;
1439 BOOL send_quit = TRUE;
1440 BOOL setting_up = TRUE;
1441 BOOL completed_address = FALSE;
1442 BOOL esmtp = TRUE;
1443 BOOL pending_MAIL;
1444 BOOL pass_message = FALSE;
1445 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1446 #ifndef DISABLE_PRDR
1447 BOOL prdr_active;
1448 #endif
1449 #ifdef SUPPORT_I18N
1450 BOOL utf8_needed = FALSE;
1451 #endif
1452 BOOL dsn_all_lasthop = TRUE;
1453 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1454 BOOL dane = FALSE;
1455 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1456 dns_answer tlsa_dnsa;
1457 #endif
1458 smtp_inblock inblock;
1459 smtp_outblock outblock;
1460 int max_rcpt = tblock->max_addresses;
1461 uschar *igquotstr = US"";
1462
1463 #ifdef EXPERIMENTAL_DSN_INFO
1464 uschar *smtp_greeting = NULL;
1465 uschar *helo_response = NULL;
1466 #endif
1467 uschar *helo_data = NULL;
1468
1469 uschar *message = NULL;
1470 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1471 uschar *p;
1472 uschar buffer[4096];
1473 uschar inbuffer[4096];
1474 uschar outbuffer[4096];
1475
1476 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1477
1478 *message_defer = FALSE;
1479 smtp_command = US"initial connection";
1480 if (max_rcpt == 0) max_rcpt = 999999;
1481
1482 /* Set up the buffer for reading SMTP response packets. */
1483
1484 inblock.buffer = inbuffer;
1485 inblock.buffersize = sizeof(inbuffer);
1486 inblock.ptr = inbuffer;
1487 inblock.ptrend = inbuffer;
1488
1489 /* Set up the buffer for holding SMTP commands while pipelining */
1490
1491 outblock.buffer = outbuffer;
1492 outblock.buffersize = sizeof(outbuffer);
1493 outblock.ptr = outbuffer;
1494 outblock.cmd_count = 0;
1495 outblock.authenticating = FALSE;
1496
1497 /* Reset the parameters of a TLS session. */
1498
1499 tls_out.bits = 0;
1500 tls_out.cipher = NULL; /* the one we may use for this transport */
1501 tls_out.ourcert = NULL;
1502 tls_out.peercert = NULL;
1503 tls_out.peerdn = NULL;
1504 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1505 tls_out.sni = NULL;
1506 #endif
1507 tls_out.ocsp = OCSP_NOT_REQ;
1508
1509 /* Flip the legacy TLS-related variables over to the outbound set in case
1510 they're used in the context of the transport. Don't bother resetting
1511 afterward as we're in a subprocess. */
1512
1513 tls_modify_variables(&tls_out);
1514
1515 #ifndef SUPPORT_TLS
1516 if (smtps)
1517 {
1518 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1519 DEFER, FALSE);
1520 return ERROR;
1521 }
1522 #endif
1523
1524 /* Make a connection to the host if this isn't a continued delivery, and handle
1525 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1526 specially so they can be identified for retries. */
1527
1528 if (continue_hostname == NULL)
1529 {
1530 /* This puts port into host->port */
1531 inblock.sock = outblock.sock =
1532 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1533
1534 if (inblock.sock < 0)
1535 {
1536 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1537 NULL, DEFER, FALSE);
1538 return DEFER;
1539 }
1540
1541 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1542 {
1543 tls_out.dane_verified = FALSE;
1544 tls_out.tlsa_usage = 0;
1545
1546 if (host->dnssec == DS_YES)
1547 {
1548 if( ( dane_required
1549 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1550 )
1551 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1552 && dane_required /* do not error on only dane-requested */
1553 )
1554 {
1555 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1556 string_sprintf("DANE error: tlsa lookup %s",
1557 rc == DEFER ? "DEFER" : "FAIL"),
1558 rc, FALSE);
1559 return rc;
1560 }
1561 }
1562 else if (dane_required)
1563 {
1564 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1565 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1566 FAIL, FALSE);
1567 return FAIL;
1568 }
1569
1570 if (dane)
1571 ob->tls_tempfail_tryclear = FALSE;
1572 }
1573 #endif /*DANE*/
1574
1575 /* Expand the greeting message while waiting for the initial response. (Makes
1576 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1577 delayed till here so that $sending_interface and $sending_port are set. */
1578
1579 helo_data = expand_string(ob->helo_data);
1580 #ifdef SUPPORT_I18N
1581 if (helo_data)
1582 {
1583 uschar * errstr = NULL;
1584 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1585 {
1586 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1587 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1588 yield = DEFER;
1589 goto SEND_QUIT;
1590 }
1591 }
1592 #endif
1593
1594 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1595 is nevertheless a reasonably clean way of programming this kind of logic,
1596 where you want to escape on any error. */
1597
1598 if (!smtps)
1599 {
1600 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1601 '2', ob->command_timeout);
1602 #ifdef EXPERIMENTAL_DSN_INFO
1603 smtp_greeting = string_copy(buffer);
1604 #endif
1605 if (!good_response) goto RESPONSE_FAILED;
1606
1607 #ifndef DISABLE_EVENT
1608 {
1609 uschar * s;
1610 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1611 : host->dnssec==DS_NO ? US"no" : NULL;
1612 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1613 if (s)
1614 {
1615 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1616 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1617 DEFER, FALSE);
1618 yield = DEFER;
1619 goto SEND_QUIT;
1620 }
1621 }
1622 #endif
1623
1624 /* Now check if the helo_data expansion went well, and sign off cleanly if
1625 it didn't. */
1626
1627 if (helo_data == NULL)
1628 {
1629 uschar *message = string_sprintf("failed to expand helo_data: %s",
1630 expand_string_message);
1631 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1632 yield = DEFER;
1633 goto SEND_QUIT;
1634 }
1635 }
1636
1637 /** Debugging without sending a message
1638 addrlist->transport_return = DEFER;
1639 goto SEND_QUIT;
1640 **/
1641
1642 /* Errors that occur after this point follow an SMTP command, which is
1643 left in big_buffer by smtp_write_command() for use in error messages. */
1644
1645 smtp_command = big_buffer;
1646
1647 /* Tell the remote who we are...
1648
1649 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1650 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1651 greeting is of this form. The assumption was that the far end supports it
1652 properly... but experience shows that there are some that give 5xx responses,
1653 even though the banner includes "ESMTP" (there's a bloody-minded one that
1654 says "ESMTP not spoken here"). Cope with that case.
1655
1656 September 2000: Time has passed, and it seems reasonable now to always send
1657 EHLO at the start. It is also convenient to make the change while installing
1658 the TLS stuff.
1659
1660 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1661 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1662 would be no way to send out the mails, so there is now a host list
1663 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1664 PIPELINING problem as well. Maybe it can also be useful to cure other
1665 problems with broken servers.
1666
1667 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1668 Then somebody tried it with a Microsoft mailer... It seems that all other
1669 mailers use upper case for some reason (the RFC is quite clear about case
1670 independence) so, for peace of mind, I gave in. */
1671
1672 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1673
1674 /* Alas; be careful, since this goto is not an error-out, so conceivably
1675 we might set data between here and the target which we assume to exist
1676 and be usable. I can see this coming back to bite us. */
1677 #ifdef SUPPORT_TLS
1678 if (smtps)
1679 {
1680 tls_offered = TRUE;
1681 suppress_tls = FALSE;
1682 ob->tls_tempfail_tryclear = FALSE;
1683 smtp_command = US"SSL-on-connect";
1684 goto TLS_NEGOTIATE;
1685 }
1686 #endif
1687
1688 if (esmtp)
1689 {
1690 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1691 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1692 goto SEND_FAILED;
1693 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1694 ob->command_timeout))
1695 {
1696 if (errno != 0 || buffer[0] == 0 || lmtp)
1697 {
1698 #ifdef EXPERIMENTAL_DSN_INFO
1699 helo_response = string_copy(buffer);
1700 #endif
1701 goto RESPONSE_FAILED;
1702 }
1703 esmtp = FALSE;
1704 }
1705 #ifdef EXPERIMENTAL_DSN_INFO
1706 helo_response = string_copy(buffer);
1707 #endif
1708 }
1709 else
1710 {
1711 DEBUG(D_transport)
1712 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1713 }
1714
1715 if (!esmtp)
1716 {
1717 BOOL good_response;
1718
1719 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1720 goto SEND_FAILED;
1721 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1722 '2', ob->command_timeout);
1723 #ifdef EXPERIMENTAL_DSN_INFO
1724 helo_response = string_copy(buffer);
1725 #endif
1726 if (!good_response) goto RESPONSE_FAILED;
1727 }
1728
1729 if (esmtp || lmtp)
1730 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1731 PEER_OFFERED_TLS
1732 | 0 /* IGNQ checked later */
1733 | 0 /* PRDR checked later */
1734 | 0 /* UTF8 checked later */
1735 | 0 /* DSN checked later */
1736 | 0 /* PIPE checked later */
1737 | 0 /* SIZE checked later */
1738 );
1739
1740 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1741
1742 #ifdef SUPPORT_TLS
1743 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1744 #endif
1745 }
1746
1747 /* For continuing deliveries down the same channel, the socket is the standard
1748 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1749 below). Set up the pointer to where subsequent commands will be left, for
1750 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1751 set from the command line if they were set in the process that passed the
1752 connection on. */
1753
1754 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1755 as the contine goes via transport_pass_socket() and doublefork and exec.
1756 It does not wait. Unclear how we keep separate host's responses
1757 separate - we could match up by host ip+port as a bodge. */
1758
1759 else
1760 {
1761 inblock.sock = outblock.sock = fileno(stdin);
1762 smtp_command = big_buffer;
1763 host->port = port; /* Record the port that was used */
1764 }
1765
1766 /* If TLS is available on this connection, whether continued or not, attempt to
1767 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1768 send another EHLO - the server may give a different answer in secure mode. We
1769 use a separate buffer for reading the response to STARTTLS so that if it is
1770 negative, the original EHLO data is available for subsequent analysis, should
1771 the client not be required to use TLS. If the response is bad, copy the buffer
1772 for error analysis. */
1773
1774 #ifdef SUPPORT_TLS
1775 if ( tls_offered
1776 && !suppress_tls
1777 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1778 {
1779 uschar buffer2[4096];
1780 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1781 goto SEND_FAILED;
1782
1783 /* If there is an I/O error, transmission of this message is deferred. If
1784 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1785 false, we also defer. However, if there is a temporary rejection of STARTTLS
1786 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1787 STARTTLS, we carry on. This means we will try to send the message in clear,
1788 unless the host is in hosts_require_tls (tested below). */
1789
1790 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1791 ob->command_timeout))
1792 {
1793 if (errno != 0 || buffer2[0] == 0 ||
1794 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1795 {
1796 Ustrncpy(buffer, buffer2, sizeof(buffer));
1797 goto RESPONSE_FAILED;
1798 }
1799 }
1800
1801 /* STARTTLS accepted: try to negotiate a TLS session. */
1802
1803 else
1804 TLS_NEGOTIATE:
1805 {
1806 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1807 # ifdef EXPERIMENTAL_DANE
1808 , dane ? &tlsa_dnsa : NULL
1809 # endif
1810 );
1811
1812 /* TLS negotiation failed; give an error. From outside, this function may
1813 be called again to try in clear on a new connection, if the options permit
1814 it for this host. */
1815
1816 if (rc != OK)
1817 {
1818 # ifdef EXPERIMENTAL_DANE
1819 if (rc == DEFER && dane && !dane_required)
1820 {
1821 log_write(0, LOG_MAIN, "DANE attempt failed;"
1822 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1823 host->name, host->address);
1824 dane = FALSE;
1825 goto TLS_NEGOTIATE;
1826 }
1827 # endif
1828
1829 save_errno = ERRNO_TLSFAILURE;
1830 message = US"failure while setting up TLS session";
1831 send_quit = FALSE;
1832 goto TLS_FAILED;
1833 }
1834
1835 /* TLS session is set up */
1836
1837 for (addr = addrlist; addr; addr = addr->next)
1838 if (addr->transport_return == PENDING_DEFER)
1839 {
1840 addr->cipher = tls_out.cipher;
1841 addr->ourcert = tls_out.ourcert;
1842 addr->peercert = tls_out.peercert;
1843 addr->peerdn = tls_out.peerdn;
1844 addr->ocsp = tls_out.ocsp;
1845 }
1846 }
1847 }
1848
1849 /* if smtps, we'll have smtp_command set to something else; always safe to
1850 reset it here. */
1851 smtp_command = big_buffer;
1852
1853 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1854 helo_data is null, we are dealing with a connection that was passed from
1855 another process, and so we won't have expanded helo_data above. We have to
1856 expand it here. $sending_ip_address and $sending_port are set up right at the
1857 start of the Exim process (in exim.c). */
1858
1859 if (tls_out.active >= 0)
1860 {
1861 char *greeting_cmd;
1862 BOOL good_response;
1863
1864 if (helo_data == NULL)
1865 {
1866 helo_data = expand_string(ob->helo_data);
1867 if (helo_data == NULL)
1868 {
1869 uschar *message = string_sprintf("failed to expand helo_data: %s",
1870 expand_string_message);
1871 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1872 yield = DEFER;
1873 goto SEND_QUIT;
1874 }
1875 }
1876
1877 /* For SMTPS we need to wait for the initial OK response. */
1878 if (smtps)
1879 {
1880 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1881 '2', ob->command_timeout);
1882 #ifdef EXPERIMENTAL_DSN_INFO
1883 smtp_greeting = string_copy(buffer);
1884 #endif
1885 if (!good_response) goto RESPONSE_FAILED;
1886 }
1887
1888 if (esmtp)
1889 greeting_cmd = "EHLO";
1890 else
1891 {
1892 greeting_cmd = "HELO";
1893 DEBUG(D_transport)
1894 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1895 }
1896
1897 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1898 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1899 goto SEND_FAILED;
1900 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1901 '2', ob->command_timeout);
1902 #ifdef EXPERIMENTAL_DSN_INFO
1903 helo_response = string_copy(buffer);
1904 #endif
1905 if (!good_response) goto RESPONSE_FAILED;
1906 }
1907
1908 /* If the host is required to use a secure channel, ensure that we
1909 have one. */
1910
1911 else if (
1912 # ifdef EXPERIMENTAL_DANE
1913 dane ||
1914 # endif
1915 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1916 )
1917 {
1918 save_errno = ERRNO_TLSREQUIRED;
1919 message = string_sprintf("a TLS session is required, but %s",
1920 tls_offered? "an attempt to start TLS failed" :
1921 "the server did not offer TLS support");
1922 goto TLS_FAILED;
1923 }
1924 #endif /*SUPPORT_TLS*/
1925
1926 /* If TLS is active, we have just started it up and re-done the EHLO command,
1927 so its response needs to be analyzed. If TLS is not active and this is a
1928 continued session down a previously-used socket, we haven't just done EHLO, so
1929 we skip this. */
1930
1931 if (continue_hostname == NULL
1932 #ifdef SUPPORT_TLS
1933 || tls_out.active >= 0
1934 #endif
1935 )
1936 {
1937 if (esmtp || lmtp)
1938 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1939 0 /* no TLS */
1940 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1941 | PEER_OFFERED_PRDR
1942 #ifdef SUPPORT_I18N
1943 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1944 /*XXX if we hand peercaps on to continued-conn processes,
1945 must not depend on this addr */
1946 #endif
1947 | PEER_OFFERED_DSN
1948 | PEER_OFFERED_PIPE
1949 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1950 );
1951
1952 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1953 lmtp_ignore_quota option was set. */
1954
1955 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1956
1957 /* If the response to EHLO specified support for the SIZE parameter, note
1958 this, provided size_addition is non-negative. */
1959
1960 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1961
1962 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1963 the current host, esmtp will be false, so PIPELINING can never be used. If
1964 the current host matches hosts_avoid_pipelining, don't do it. */
1965
1966 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1967 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1968
1969 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1970 smtp_use_pipelining ? "" : "not ");
1971
1972 #ifndef DISABLE_PRDR
1973 if ( peer_offered & PEER_OFFERED_PRDR
1974 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1975 peer_offered &= ~PEER_OFFERED_PRDR;
1976
1977 if (peer_offered & PEER_OFFERED_PRDR)
1978 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1979 #endif
1980
1981 /* Note if the server supports DSN */
1982 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1983 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1984
1985 /* Note if the response to EHLO specifies support for the AUTH extension.
1986 If it has, check that this host is one we want to authenticate to, and do
1987 the business. The host name and address must be available when the
1988 authenticator's client driver is running. */
1989
1990 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1991 ob, esmtp, &inblock, &outblock))
1992 {
1993 default: goto SEND_QUIT;
1994 case OK: break;
1995 case FAIL_SEND: goto SEND_FAILED;
1996 case FAIL: goto RESPONSE_FAILED;
1997 }
1998 }
1999
2000 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2001 message-specific. */
2002
2003 setting_up = FALSE;
2004
2005 #ifdef SUPPORT_I18N
2006 if (addrlist->prop.utf8_msg)
2007 {
2008 utf8_needed = !addrlist->prop.utf8_downcvt
2009 && !addrlist->prop.utf8_downcvt_maybe;
2010 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2011 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2012 }
2013
2014 /* If this is an international message we need the host to speak SMTPUTF8 */
2015 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2016 {
2017 errno = ERRNO_UTF8_FWD;
2018 goto RESPONSE_FAILED;
2019 }
2020 #endif
2021
2022 /* If there is a filter command specified for this transport, we can now
2023 set it up. This cannot be done until the identify of the host is known. */
2024
2025 if (tblock->filter_command != NULL)
2026 {
2027 BOOL rc;
2028 uschar buffer[64];
2029 sprintf(CS buffer, "%.50s transport", tblock->name);
2030 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2031 TRUE, DEFER, addrlist, buffer, NULL);
2032 transport_filter_timeout = tblock->filter_timeout;
2033
2034 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2035 yield ERROR. */
2036
2037 if (!rc)
2038 {
2039 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2040 FALSE);
2041 yield = ERROR;
2042 goto SEND_QUIT;
2043 }
2044 }
2045
2046
2047 /* For messages that have more than the maximum number of envelope recipients,
2048 we want to send several transactions down the same SMTP connection. (See
2049 comments in deliver.c as to how this reconciles, heuristically, with
2050 remote_max_parallel.) This optimization was added to Exim after the following
2051 code was already working. The simplest way to put it in without disturbing the
2052 code was to use a goto to jump back to this point when there is another
2053 transaction to handle. */
2054
2055 SEND_MESSAGE:
2056 sync_addr = first_addr;
2057 address_count = 0;
2058 ok = FALSE;
2059 send_rset = TRUE;
2060 completed_address = FALSE;
2061
2062
2063 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2064 qualification, send it, adding something to the message size to allow for
2065 imprecision and things that get added en route. Exim keeps the number of lines
2066 in a message, so we can give an accurate value for the original message, but we
2067 need some additional to handle added headers. (Double "." characters don't get
2068 included in the count.) */
2069
2070 p = buffer;
2071 *p = 0;
2072
2073 if (smtp_use_size)
2074 {
2075 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2076 while (*p) p++;
2077 }
2078
2079 #ifndef DISABLE_PRDR
2080 prdr_active = FALSE;
2081 if (peer_offered & PEER_OFFERED_PRDR)
2082 for (addr = first_addr; addr; addr = addr->next)
2083 if (addr->transport_return == PENDING_DEFER)
2084 {
2085 for (addr = addr->next; addr; addr = addr->next)
2086 if (addr->transport_return == PENDING_DEFER)
2087 { /* at least two recipients to send */
2088 prdr_active = TRUE;
2089 sprintf(CS p, " PRDR"); p += 5;
2090 break;
2091 }
2092 break;
2093 }
2094 #endif
2095
2096 #ifdef SUPPORT_I18N
2097 if ( addrlist->prop.utf8_msg
2098 && !addrlist->prop.utf8_downcvt
2099 && peer_offered & PEER_OFFERED_UTF8
2100 )
2101 sprintf(CS p, " SMTPUTF8"), p += 9;
2102 #endif
2103
2104 /* check if all addresses have lasthop flag */
2105 /* do not send RET and ENVID if true */
2106 for (dsn_all_lasthop = TRUE, addr = first_addr;
2107 address_count < max_rcpt && addr != NULL;
2108 addr = addr->next)
2109 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2110 {
2111 dsn_all_lasthop = FALSE;
2112 break;
2113 }
2114
2115 /* Add any DSN flags to the mail command */
2116
2117 if (smtp_use_dsn && !dsn_all_lasthop)
2118 {
2119 if (dsn_ret == dsn_ret_hdrs)
2120 {
2121 Ustrcpy(p, " RET=HDRS");
2122 while (*p) p++;
2123 }
2124 else if (dsn_ret == dsn_ret_full)
2125 {
2126 Ustrcpy(p, " RET=FULL");
2127 while (*p) p++;
2128 }
2129 if (dsn_envid != NULL)
2130 {
2131 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2132 while (*p) p++;
2133 }
2134 }
2135
2136 /* If an authenticated_sender override has been specified for this transport
2137 instance, expand it. If the expansion is forced to fail, and there was already
2138 an authenticated_sender for this message, the original value will be used.
2139 Other expansion failures are serious. An empty result is ignored, but there is
2140 otherwise no check - this feature is expected to be used with LMTP and other
2141 cases where non-standard addresses (e.g. without domains) might be required. */
2142
2143 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2144 {
2145 yield = ERROR;
2146 goto SEND_QUIT;
2147 }
2148
2149 /* From here until we send the DATA command, we can make use of PIPELINING
2150 if the server host supports it. The code has to be able to check the responses
2151 at any point, for when the buffer fills up, so we write it totally generally.
2152 When PIPELINING is off, each command written reports that it has flushed the
2153 buffer. */
2154
2155 pending_MAIL = TRUE; /* The block starts with MAIL */
2156
2157 {
2158 uschar * s = return_path;
2159 #ifdef SUPPORT_I18N
2160 uschar * errstr = NULL;
2161
2162 /* If we must downconvert, do the from-address here. Remember we had to
2163 for the to-addresses (done below), and also (ugly) for re-doing when building
2164 the delivery log line. */
2165
2166 if ( addrlist->prop.utf8_msg
2167 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2168 )
2169 {
2170 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2171 {
2172 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2173 yield = ERROR;
2174 goto SEND_QUIT;
2175 }
2176 setflag(addrlist, af_utf8_downcvt);
2177 }
2178 #endif
2179
2180 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2181 "MAIL FROM:<%s>%s\r\n", s, buffer);
2182 }
2183
2184 mail_command = string_copy(big_buffer); /* Save for later error message */
2185
2186 switch(rc)
2187 {
2188 case -1: /* Transmission error */
2189 goto SEND_FAILED;
2190
2191 case +1: /* Block was sent */
2192 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2193 ob->command_timeout))
2194 {
2195 if (errno == 0 && buffer[0] == '4')
2196 {
2197 errno = ERRNO_MAIL4XX;
2198 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2199 }
2200 goto RESPONSE_FAILED;
2201 }
2202 pending_MAIL = FALSE;
2203 break;
2204 }
2205
2206 /* Pass over all the relevant recipient addresses for this host, which are the
2207 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2208 several before we have to read the responses for those seen so far. This
2209 checking is done by a subroutine because it also needs to be done at the end.
2210 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2211 the next one if not all are sent.
2212
2213 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2214 last address because we want to abort if any recipients have any kind of
2215 problem, temporary or permanent. We know that all recipient addresses will have
2216 the PENDING_DEFER status, because only one attempt is ever made, and we know
2217 that max_rcpt will be large, so all addresses will be done at once. */
2218
2219 for (addr = first_addr;
2220 address_count < max_rcpt && addr != NULL;
2221 addr = addr->next)
2222 {
2223 int count;
2224 BOOL no_flush;
2225 uschar * rcpt_addr;
2226
2227 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2228
2229 if (addr->transport_return != PENDING_DEFER) continue;
2230
2231 address_count++;
2232 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2233
2234 /* Add any DSN flags to the rcpt command and add to the sent string */
2235
2236 p = buffer;
2237 *p = 0;
2238
2239 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2240 {
2241 if ((addr->dsn_flags & rf_dsnflags) != 0)
2242 {
2243 int i;
2244 BOOL first = TRUE;
2245 Ustrcpy(p, " NOTIFY=");
2246 while (*p) p++;
2247 for (i = 0; i < 4; i++)
2248 if ((addr->dsn_flags & rf_list[i]) != 0)
2249 {
2250 if (!first) *p++ = ',';
2251 first = FALSE;
2252 Ustrcpy(p, rf_names[i]);
2253 while (*p) p++;
2254 }
2255 }
2256
2257 if (addr->dsn_orcpt != NULL)
2258 {
2259 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2260 addr->dsn_orcpt);
2261 while (*p) p++;
2262 }
2263 }
2264
2265 /* Now send the RCPT command, and process outstanding responses when
2266 necessary. After a timeout on RCPT, we just end the function, leaving the
2267 yield as OK, because this error can often mean that there is a problem with
2268 just one address, so we don't want to delay the host. */
2269
2270 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2271
2272 #ifdef SUPPORT_I18N
2273 {
2274 uschar * dummy_errstr;
2275 if ( testflag(addrlist, af_utf8_downcvt)
2276 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2277 dummy_errstr
2278 ) )
2279 {
2280 errno = ERRNO_EXPANDFAIL;
2281 goto SEND_FAILED;
2282 }
2283 }
2284 #endif
2285
2286 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2287 rcpt_addr, igquotstr, buffer);
2288
2289 if (count < 0) goto SEND_FAILED;
2290 if (count > 0)
2291 {
2292 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2293 &sync_addr, host, count, ob->address_retry_include_sender,
2294 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2295 sizeof(buffer)))
2296 {
2297 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2298 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2299 break;
2300
2301 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2302 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2303 case 0: /* No 2xx or 5xx, but no probs */
2304 break;
2305
2306 case -1: goto END_OFF; /* Timeout on RCPT */
2307 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2308 }
2309 pending_MAIL = FALSE; /* Dealt with MAIL */
2310 }
2311 } /* Loop for next address */
2312
2313 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2314 permanently or temporarily. We should have flushed and synced after the last
2315 RCPT. */
2316
2317 if (mua_wrapper)
2318 {
2319 address_item *badaddr;
2320 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2321 if (badaddr->transport_return != PENDING_OK)
2322 {
2323 /*XXX could we find a better errno than 0 here? */
2324 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2325 testflag(badaddr, af_pass_message));
2326 ok = FALSE;
2327 break;
2328 }
2329 }
2330
2331 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2332 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2333 have a good recipient buffered up if we are pipelining. We don't want to waste
2334 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2335 are pipelining. The responses are all handled by sync_responses(). */
2336
2337 if (ok || (smtp_use_pipelining && !mua_wrapper))
2338 {
2339 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2340 if (count < 0) goto SEND_FAILED;
2341 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2342 host, count, ob->address_retry_include_sender, pending_MAIL,
2343 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2344 {
2345 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2346 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2347 break;
2348
2349 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2350 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2351 case 0: break; /* No 2xx or 5xx, but no probs */
2352
2353 case -1: goto END_OFF; /* Timeout on RCPT */
2354 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2355 }
2356 }
2357
2358 /* Save the first address of the next batch. */
2359
2360 first_addr = addr;
2361
2362 /* If there were no good recipients (but otherwise there have been no
2363 problems), just set ok TRUE, since we have handled address-specific errors
2364 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2365 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2366 well as body. Set the appropriate timeout value to be used for each chunk.
2367 (Haven't been able to make it work using select() for writing yet.) */
2368
2369 if (!ok) ok = TRUE; else
2370 {
2371 sigalrm_seen = FALSE;
2372 transport_write_timeout = ob->data_timeout;
2373 smtp_command = US"sending data block"; /* For error messages */
2374 DEBUG(D_transport|D_v)
2375 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2376 transport_count = 0;
2377
2378 #ifndef DISABLE_DKIM
2379 ok = dkim_transport_write_message(addrlist, inblock.sock,
2380 topt_use_crlf | topt_end_dot | topt_escape_headers |
2381 (tblock->body_only? topt_no_headers : 0) |
2382 (tblock->headers_only? topt_no_body : 0) |
2383 (tblock->return_path_add? topt_add_return_path : 0) |
2384 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2385 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2386 0, /* No size limit */
2387 tblock->add_headers, tblock->remove_headers,
2388 US".", US"..", /* Escaping strings */
2389 tblock->rewrite_rules, tblock->rewrite_existflags,
2390 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2391 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2392 );
2393 #else
2394 ok = transport_write_message(addrlist, inblock.sock,
2395 topt_use_crlf | topt_end_dot | topt_escape_headers |
2396 (tblock->body_only? topt_no_headers : 0) |
2397 (tblock->headers_only? topt_no_body : 0) |
2398 (tblock->return_path_add? topt_add_return_path : 0) |
2399 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2400 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2401 0, /* No size limit */
2402 tblock->add_headers, tblock->remove_headers,
2403 US".", US"..", /* Escaping strings */
2404 tblock->rewrite_rules, tblock->rewrite_existflags);
2405 #endif
2406
2407 /* transport_write_message() uses write() because it is called from other
2408 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2409 it can exit with "Broken pipe" as its error. This really means that the
2410 socket got closed at the far end. */
2411
2412 transport_write_timeout = 0; /* for subsequent transports */
2413
2414 /* Failure can either be some kind of I/O disaster (including timeout),
2415 or the failure of a transport filter or the expansion of added headers. */
2416
2417 if (!ok)
2418 {
2419 buffer[0] = 0; /* There hasn't been a response */
2420 goto RESPONSE_FAILED;
2421 }
2422
2423 /* We used to send the terminating "." explicitly here, but because of
2424 buffering effects at both ends of TCP/IP connections, you don't gain
2425 anything by keeping it separate, so it might as well go in the final
2426 data buffer for efficiency. This is now done by setting the topt_end_dot
2427 flag above. */
2428
2429 smtp_command = US"end of data";
2430
2431 #ifndef DISABLE_PRDR
2432 /* For PRDR we optionally get a partial-responses warning
2433 * followed by the individual responses, before going on with
2434 * the overall response. If we don't get the warning then deal
2435 * with per non-PRDR. */
2436 if(prdr_active)
2437 {
2438 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2439 ob->final_timeout);
2440 if (!ok && errno == 0)
2441 switch(buffer[0])
2442 {
2443 case '2': prdr_active = FALSE;
2444 ok = TRUE;
2445 break;
2446 case '4': errno = ERRNO_DATA4XX;
2447 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2448 break;
2449 }
2450 }
2451 else
2452 #endif
2453
2454 /* For non-PRDR SMTP, we now read a single response that applies to the
2455 whole message. If it is OK, then all the addresses have been delivered. */
2456
2457 if (!lmtp)
2458 {
2459 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2460 ob->final_timeout);
2461 if (!ok && errno == 0 && buffer[0] == '4')
2462 {
2463 errno = ERRNO_DATA4XX;
2464 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2465 }
2466 }
2467
2468 /* For LMTP, we get back a response for every RCPT command that we sent;
2469 some may be accepted and some rejected. For those that get a response, their
2470 status is fixed; any that are accepted have been handed over, even if later
2471 responses crash - at least, that's how I read RFC 2033.
2472
2473 If all went well, mark the recipient addresses as completed, record which
2474 host/IPaddress they were delivered to, and cut out RSET when sending another
2475 message down the same channel. Write the completed addresses to the journal
2476 now so that they are recorded in case there is a crash of hardware or
2477 software before the spool gets updated. Also record the final SMTP
2478 confirmation if needed (for SMTP only). */
2479
2480 if (ok)
2481 {
2482 int flag = '=';
2483 int delivery_time = (int)(time(NULL) - start_delivery_time);
2484 int len;
2485 uschar *conf = NULL;
2486 send_rset = FALSE;
2487
2488 /* Set up confirmation if needed - applies only to SMTP */
2489
2490 if (
2491 #ifdef DISABLE_EVENT
2492 LOGGING(smtp_confirmation) &&
2493 #endif
2494 !lmtp
2495 )
2496 {
2497 const uschar *s = string_printing(buffer);
2498 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2499 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2500 }
2501
2502 /* Process all transported addresses - for LMTP or PRDR, read a status for
2503 each one. */
2504
2505 for (addr = addrlist; addr != first_addr; addr = addr->next)
2506 {
2507 if (addr->transport_return != PENDING_OK) continue;
2508
2509 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2510 remaining addresses. Otherwise, it's a return code for just the one
2511 address. For temporary errors, add a retry item for the address so that
2512 it doesn't get tried again too soon. */
2513
2514 #ifndef DISABLE_PRDR
2515 if (lmtp || prdr_active)
2516 #else
2517 if (lmtp)
2518 #endif
2519 {
2520 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2521 ob->final_timeout))
2522 {
2523 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2524 addr->message = string_sprintf(
2525 #ifndef DISABLE_PRDR
2526 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2527 #else
2528 "LMTP error after %s: %s",
2529 #endif
2530 big_buffer, string_printing(buffer));
2531 setflag(addr, af_pass_message); /* Allow message to go to user */
2532 if (buffer[0] == '5')
2533 addr->transport_return = FAIL;
2534 else
2535 {
2536 errno = ERRNO_DATA4XX;
2537 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2538 addr->transport_return = DEFER;
2539 #ifndef DISABLE_PRDR
2540 if (!prdr_active)
2541 #endif
2542 retry_add_item(addr, addr->address_retry_key, 0);
2543 }
2544 continue;
2545 }
2546 completed_address = TRUE; /* NOW we can set this flag */
2547 if (LOGGING(smtp_confirmation))
2548 {
2549 const uschar *s = string_printing(buffer);
2550 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2551 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2552 }
2553 }
2554
2555 /* SMTP, or success return from LMTP for this address. Pass back the
2556 actual host that was used. */
2557
2558 addr->transport_return = OK;
2559 addr->more_errno = delivery_time;
2560 addr->host_used = host;
2561 addr->special_action = flag;
2562 addr->message = conf;
2563 #ifndef DISABLE_PRDR
2564 if (prdr_active) addr->flags |= af_prdr_used;
2565 #endif
2566 flag = '-';
2567
2568 #ifndef DISABLE_PRDR
2569 if (!prdr_active)
2570 #endif
2571 {
2572 /* Update the journal. For homonymic addresses, use the base address plus
2573 the transport name. See lots of comments in deliver.c about the reasons
2574 for the complications when homonyms are involved. Just carry on after
2575 write error, as it may prove possible to update the spool file later. */
2576
2577 if (testflag(addr, af_homonym))
2578 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2579 else
2580 sprintf(CS buffer, "%.500s\n", addr->unique);
2581
2582 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2583 len = Ustrlen(CS buffer);
2584 if (write(journal_fd, buffer, len) != len)
2585 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2586 "%s: %s", buffer, strerror(errno));
2587 }
2588 }
2589
2590 #ifndef DISABLE_PRDR
2591 if (prdr_active)
2592 {
2593 /* PRDR - get the final, overall response. For any non-success
2594 upgrade all the address statuses. */
2595 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2596 ob->final_timeout);
2597 if (!ok)
2598 {
2599 if(errno == 0 && buffer[0] == '4')
2600 {
2601 errno = ERRNO_DATA4XX;
2602 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2603 }
2604 for (addr = addrlist; addr != first_addr; addr = addr->next)
2605 if (buffer[0] == '5' || addr->transport_return == OK)
2606 addr->transport_return = PENDING_OK; /* allow set_errno action */
2607 goto RESPONSE_FAILED;
2608 }
2609
2610 /* Update the journal, or setup retry. */
2611 for (addr = addrlist; addr != first_addr; addr = addr->next)
2612 if (addr->transport_return == OK)
2613 {
2614 if (testflag(addr, af_homonym))
2615 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2616 else
2617 sprintf(CS buffer, "%.500s\n", addr->unique);
2618
2619 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2620 len = Ustrlen(CS buffer);
2621 if (write(journal_fd, buffer, len) != len)
2622 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2623 "%s: %s", buffer, strerror(errno));
2624 }
2625 else if (addr->transport_return == DEFER)
2626 retry_add_item(addr, addr->address_retry_key, -2);
2627 }
2628 #endif
2629
2630 /* Ensure the journal file is pushed out to disk. */
2631
2632 if (EXIMfsync(journal_fd) < 0)
2633 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2634 strerror(errno));
2635 }
2636 }
2637
2638
2639 /* Handle general (not specific to one address) failures here. The value of ok
2640 is used to skip over this code on the falling through case. A timeout causes a
2641 deferral. Other errors may defer or fail according to the response code, and
2642 may set up a special errno value, e.g. after connection chopped, which is
2643 assumed if errno == 0 and there is no text in the buffer. If control reaches
2644 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2645 the problem is not related to this specific message. */
2646
2647 if (!ok)
2648 {
2649 int code, set_rc;
2650 uschar * set_message;
2651
2652 RESPONSE_FAILED:
2653 {
2654 save_errno = errno;
2655 message = NULL;
2656 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2657 buffer, &code, &message, &pass_message);
2658 goto FAILED;
2659 }
2660
2661 SEND_FAILED:
2662 {
2663 save_errno = errno;
2664 code = '4';
2665 message = US string_sprintf("send() to %s [%s] failed: %s",
2666 host->name, host->address, strerror(save_errno));
2667 send_quit = FALSE;
2668 goto FAILED;
2669 }
2670
2671 /* This label is jumped to directly when a TLS negotiation has failed,
2672 or was not done for a host for which it is required. Values will be set
2673 in message and save_errno, and setting_up will always be true. Treat as
2674 a temporary error. */
2675
2676 #ifdef SUPPORT_TLS
2677 TLS_FAILED:
2678 code = '4';
2679 #endif
2680
2681 /* If the failure happened while setting up the call, see if the failure was
2682 a 5xx response (this will either be on connection, or following HELO - a 5xx
2683 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2684 never going to accept them. For other errors during setting up (timeouts or
2685 whatever), defer all addresses, and yield DEFER, so that the host is not
2686 tried again for a while. */
2687
2688 FAILED:
2689 ok = FALSE; /* For when reached by GOTO */
2690 set_message = message;
2691
2692 if (setting_up)
2693 {
2694 if (code == '5')
2695 set_rc = FAIL;
2696 else
2697 yield = set_rc = DEFER;
2698 }
2699
2700 /* We want to handle timeouts after MAIL or "." and loss of connection after
2701 "." specially. They can indicate a problem with the sender address or with
2702 the contents of the message rather than a real error on the connection. These
2703 cases are treated in the same way as a 4xx response. This next bit of code
2704 does the classification. */
2705
2706 else
2707 {
2708 BOOL message_error;
2709
2710 switch(save_errno)
2711 {
2712 #ifdef SUPPORT_I18N
2713 case ERRNO_UTF8_FWD:
2714 code = '5';
2715 /*FALLTHROUGH*/
2716 #endif
2717 case 0:
2718 case ERRNO_MAIL4XX:
2719 case ERRNO_DATA4XX:
2720 message_error = TRUE;
2721 break;
2722
2723 case ETIMEDOUT:
2724 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2725 Ustrncmp(smtp_command,"end ",4) == 0;
2726 break;
2727
2728 case ERRNO_SMTPCLOSED:
2729 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2730 break;
2731
2732 default:
2733 message_error = FALSE;
2734 break;
2735 }
2736
2737 /* Handle the cases that are treated as message errors. These are:
2738
2739 (a) negative response or timeout after MAIL
2740 (b) negative response after DATA
2741 (c) negative response or timeout or dropped connection after "."
2742 (d) utf8 support required and not offered
2743
2744 It won't be a negative response or timeout after RCPT, as that is dealt
2745 with separately above. The action in all cases is to set an appropriate
2746 error code for all the addresses, but to leave yield set to OK because the
2747 host itself has not failed. Of course, it might in practice have failed
2748 when we've had a timeout, but if so, we'll discover that at the next
2749 delivery attempt. For a temporary error, set the message_defer flag, and
2750 write to the logs for information if this is not the last host. The error
2751 for the last host will be logged as part of the address's log line. */
2752
2753 if (message_error)
2754 {
2755 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2756
2757 /* If there's an errno, the message contains just the identity of
2758 the host. */
2759
2760 if (code == '5')
2761 set_rc = FAIL;
2762 else /* Anything other than 5 is treated as temporary */
2763 {
2764 set_rc = DEFER;
2765 if (save_errno > 0)
2766 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2767 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2768 msglog_line(host, message);
2769 *message_defer = TRUE;
2770 }
2771 }
2772
2773 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2774 ".", or some other transportation error. We defer all addresses and yield
2775 DEFER, except for the case of failed add_headers expansion, or a transport
2776 filter failure, when the yield should be ERROR, to stop it trying other
2777 hosts. */
2778
2779 else
2780 {
2781 set_rc = DEFER;
2782 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2783 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2784 }
2785 }
2786
2787 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2788 #ifdef EXPERIMENTAL_DSN_INFO
2789 , smtp_greeting, helo_response
2790 #endif
2791 );
2792 }
2793
2794
2795 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2796 SMTP session tidily. However, if there were too many addresses to send in one
2797 message (indicated by first_addr being non-NULL) we want to carry on with the
2798 rest of them. Also, it is desirable to send more than one message down the SMTP
2799 connection if there are several waiting, provided we haven't already sent so
2800 many as to hit the configured limit. The function transport_check_waiting looks
2801 for a waiting message and returns its id. Then transport_pass_socket tries to
2802 set up a continued delivery by passing the socket on to another process. The
2803 variable send_rset is FALSE if a message has just been successfully transfered.
2804
2805 If we are already sending down a continued channel, there may be further
2806 addresses not yet delivered that are aimed at the same host, but which have not
2807 been passed in this run of the transport. In this case, continue_more will be
2808 true, and all we should do is send RSET if necessary, and return, leaving the
2809 channel open.
2810
2811 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2812 do not want to continue with other messages down the same channel, because that
2813 can lead to looping between two or more messages, all with the same,
2814 temporarily failing address(es). [The retry information isn't updated yet, so
2815 new processes keep on trying.] We probably also don't want to try more of this
2816 message's addresses either.
2817
2818 If we have started a TLS session, we have to end it before passing the
2819 connection to a new process. However, not all servers can handle this (Exim
2820 can), so we do not pass such a connection on if the host matches
2821 hosts_nopass_tls. */
2822
2823 DEBUG(D_transport)
2824 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2825 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2826 continue_more, yield, (first_addr == NULL)? "":"not ");
2827
2828 if (completed_address && ok && send_quit)
2829 {
2830 BOOL more;
2831 smtp_compare_t t_compare;
2832
2833 t_compare.tblock = tblock;
2834 t_compare.current_sender_address = sender_address;
2835
2836 if ( first_addr != NULL
2837 || continue_more
2838 || ( ( tls_out.active < 0
2839 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2840 )
2841 &&
2842 transport_check_waiting(tblock->name, host->name,
2843 tblock->connection_max_messages, new_message_id, &more,
2844 (oicf)smtp_are_same_identities, (void*)&t_compare)
2845 ) )
2846 {
2847 uschar *msg;
2848 BOOL pass_message;
2849
2850 if (send_rset)
2851 {
2852 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2853 {
2854 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2855 host->address, strerror(save_errno));
2856 send_quit = FALSE;
2857 }
2858 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2859 ob->command_timeout)))
2860 {
2861 int code;
2862 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2863 &pass_message);
2864 if (!send_quit)
2865 {
2866 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2867 host->name, host->address, msg);
2868 }
2869 }
2870 }
2871
2872 /* Either RSET was not needed, or it succeeded */
2873
2874 if (ok)
2875 {
2876 if (first_addr != NULL) /* More addresses still to be sent */
2877 { /* in this run of the transport */
2878 continue_sequence++; /* Causes * in logging */
2879 goto SEND_MESSAGE;
2880 }
2881 if (continue_more) return yield; /* More addresses for another run */
2882
2883 /* Pass the socket to a new Exim process. Before doing so, we must shut
2884 down TLS. Not all MTAs allow for the continuation of the SMTP session
2885 when TLS is shut down. We test for this by sending a new EHLO. If we
2886 don't get a good response, we don't attempt to pass the socket on. */
2887
2888 #ifdef SUPPORT_TLS
2889 if (tls_out.active >= 0)
2890 {
2891 tls_close(FALSE, TRUE);
2892 if (smtps)
2893 ok = FALSE;
2894 else
2895 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2896 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2897 ob->command_timeout);
2898 }
2899 #endif
2900
2901 /* If the socket is successfully passed, we musn't send QUIT (or
2902 indeed anything!) from here. */
2903
2904 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2905 propagate it from the initial
2906 */
2907 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2908 new_message_id, inblock.sock))
2909 {
2910 send_quit = FALSE;
2911 }
2912 }
2913
2914 /* If RSET failed and there are addresses left, they get deferred. */
2915
2916 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2917 #ifdef EXPERIMENTAL_DSN_INFO
2918 , smtp_greeting, helo_response
2919 #endif
2920 );
2921 }
2922 }
2923
2924 /* End off tidily with QUIT unless the connection has died or the socket has
2925 been passed to another process. There has been discussion on the net about what
2926 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2927 to wait for a response, but on the other hand, there isn't anything one can do
2928 with an error response, other than log it. Exim used to do that. However,
2929 further discussion suggested that it is positively advantageous not to wait for
2930 the response, but to close the session immediately. This is supposed to move
2931 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2932 load from the server. (Hosts that are both servers and clients may not see much
2933 difference, of course.) Further discussion indicated that this was safe to do
2934 on Unix systems which have decent implementations of TCP/IP that leave the
2935 connection around for a while (TIME_WAIT) after the application has gone away.
2936 This enables the response sent by the server to be properly ACKed rather than
2937 timed out, as can happen on broken TCP/IP implementations on other OS.
2938
2939 This change is being made on 31-Jul-98. After over a year of trouble-free
2940 operation, the old commented-out code was removed on 17-Sep-99. */
2941
2942 SEND_QUIT:
2943 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2944
2945 END_OFF:
2946
2947 #ifdef SUPPORT_TLS
2948 tls_close(FALSE, TRUE);
2949 #endif
2950
2951 /* Close the socket, and return the appropriate value, first setting
2952 works because the NULL setting is passed back to the calling process, and
2953 remote_max_parallel is forced to 1 when delivering over an existing connection,
2954
2955 If all went well and continue_more is set, we shouldn't actually get here if
2956 there are further addresses, as the return above will be taken. However,
2957 writing RSET might have failed, or there may be other addresses whose hosts are
2958 specified in the transports, and therefore not visible at top level, in which
2959 case continue_more won't get set. */
2960
2961 (void)close(inblock.sock);
2962
2963 #ifndef DISABLE_EVENT
2964 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2965 #endif
2966
2967 continue_transport = NULL;
2968 continue_hostname = NULL;
2969 return yield;
2970 }
2971
2972
2973
2974
2975 /*************************************************
2976 * Closedown entry point *
2977 *************************************************/
2978
2979 /* This function is called when exim is passed an open smtp channel
2980 from another incarnation, but the message which it has been asked
2981 to deliver no longer exists. The channel is on stdin.
2982
2983 We might do fancy things like looking for another message to send down
2984 the channel, but if the one we sought has gone, it has probably been
2985 delivered by some other process that itself will seek further messages,
2986 so just close down our connection.
2987
2988 Argument: pointer to the transport instance block
2989 Returns: nothing
2990 */
2991
2992 void
2993 smtp_transport_closedown(transport_instance *tblock)
2994 {
2995 smtp_transport_options_block *ob =
2996 (smtp_transport_options_block *)(tblock->options_block);
2997 smtp_inblock inblock;
2998 smtp_outblock outblock;
2999 uschar buffer[256];
3000 uschar inbuffer[4096];
3001 uschar outbuffer[16];
3002
3003 inblock.sock = fileno(stdin);
3004 inblock.buffer = inbuffer;
3005 inblock.buffersize = sizeof(inbuffer);
3006 inblock.ptr = inbuffer;
3007 inblock.ptrend = inbuffer;
3008
3009 outblock.sock = inblock.sock;
3010 outblock.buffersize = sizeof(outbuffer);
3011 outblock.buffer = outbuffer;
3012 outblock.ptr = outbuffer;
3013 outblock.cmd_count = 0;
3014 outblock.authenticating = FALSE;
3015
3016 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3017 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3018 ob->command_timeout);
3019 (void)close(inblock.sock);
3020 }
3021
3022
3023
3024 /*************************************************
3025 * Prepare addresses for delivery *
3026 *************************************************/
3027
3028 /* This function is called to flush out error settings from previous delivery
3029 attempts to other hosts. It also records whether we got here via an MX record
3030 or not in the more_errno field of the address. We are interested only in
3031 addresses that are still marked DEFER - others may have got delivered to a
3032 previously considered IP address. Set their status to PENDING_DEFER to indicate
3033 which ones are relevant this time.
3034
3035 Arguments:
3036 addrlist the list of addresses
3037 host the host we are delivering to
3038
3039 Returns: the first address for this delivery
3040 */
3041
3042 static address_item *
3043 prepare_addresses(address_item *addrlist, host_item *host)
3044 {
3045 address_item *first_addr = NULL;
3046 address_item *addr;
3047 for (addr = addrlist; addr != NULL; addr = addr->next)
3048 if (addr->transport_return == DEFER)
3049 {
3050 if (first_addr == NULL) first_addr = addr;
3051 addr->transport_return = PENDING_DEFER;
3052 addr->basic_errno = 0;
3053 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3054 addr->message = NULL;
3055 #ifdef SUPPORT_TLS
3056 addr->cipher = NULL;
3057 addr->ourcert = NULL;
3058 addr->peercert = NULL;
3059 addr->peerdn = NULL;
3060 addr->ocsp = OCSP_NOT_REQ;
3061 #endif
3062 #ifdef EXPERIMENTAL_DSN_INFO
3063 addr->smtp_greeting = NULL;
3064 addr->helo_response = NULL;
3065 #endif
3066 }
3067 return first_addr;
3068 }
3069
3070
3071
3072 /*************************************************
3073 * Main entry point *
3074 *************************************************/
3075
3076 /* See local README for interface details. As this is a remote transport, it is
3077 given a chain of addresses to be delivered in one connection, if possible. It
3078 always returns TRUE, indicating that each address has its own independent
3079 status set, except if there is a setting up problem, in which case it returns
3080 FALSE. */
3081
3082 BOOL
3083 smtp_transport_entry(
3084 transport_instance *tblock, /* data for this instantiation */
3085 address_item *addrlist) /* addresses we are working on */
3086 {
3087 int cutoff_retry;
3088 int port;
3089 int hosts_defer = 0;
3090 int hosts_fail = 0;
3091 int hosts_looked_up = 0;
3092 int hosts_retry = 0;
3093 int hosts_serial = 0;
3094 int hosts_total = 0;
3095 int total_hosts_tried = 0;
3096 address_item *addr;
3097 BOOL expired = TRUE;
3098 BOOL continuing = continue_hostname != NULL;
3099 uschar *expanded_hosts = NULL;
3100 uschar *pistring;
3101 uschar *tid = string_sprintf("%s transport", tblock->name);
3102 smtp_transport_options_block *ob =
3103 (smtp_transport_options_block *)(tblock->options_block);
3104 host_item *hostlist = addrlist->host_list;
3105 host_item *host = NULL;
3106
3107 DEBUG(D_transport)
3108 {
3109 debug_printf("%s transport entered\n", tblock->name);
3110 for (addr = addrlist; addr != NULL; addr = addr->next)
3111 debug_printf(" %s\n", addr->address);
3112 if (continuing) debug_printf("already connected to %s [%s]\n",
3113 continue_hostname, continue_host_address);
3114 }
3115
3116 /* Set the flag requesting that these hosts be added to the waiting
3117 database if the delivery fails temporarily or if we are running with
3118 queue_smtp or a 2-stage queue run. This gets unset for certain
3119 kinds of error, typically those that are specific to the message. */
3120
3121 update_waiting = TRUE;
3122
3123 /* If a host list is not defined for the addresses - they must all have the
3124 same one in order to be passed to a single transport - or if the transport has
3125 a host list with hosts_override set, use the host list supplied with the
3126 transport. It is an error for this not to exist. */
3127
3128 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3129 {
3130 if (ob->hosts == NULL)
3131 {
3132 addrlist->message = string_sprintf("%s transport called with no hosts set",
3133 tblock->name);
3134 addrlist->transport_return = PANIC;
3135 return FALSE; /* Only top address has status */
3136 }
3137
3138 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3139 ob->hosts);
3140
3141 /* If the transport's host list contains no '$' characters, and we are not
3142 randomizing, it is fixed and therefore a chain of hosts can be built once
3143 and for all, and remembered for subsequent use by other calls to this
3144 transport. If, on the other hand, the host list does contain '$', or we are
3145 randomizing its order, we have to rebuild it each time. In the fixed case,
3146 as the hosts string will never be used again, it doesn't matter that we
3147 replace all the : characters with zeros. */
3148
3149 if (ob->hostlist == NULL)
3150 {
3151 uschar *s = ob->hosts;
3152
3153 if (Ustrchr(s, '$') != NULL)
3154 {
3155 if (!(expanded_hosts = expand_string(s)))
3156 {
3157 addrlist->message = string_sprintf("failed to expand list of hosts "
3158 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3159 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3160 return FALSE; /* Only top address has status */
3161 }
3162 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3163 "\"%s\"\n", s, expanded_hosts);
3164 s = expanded_hosts;
3165 }
3166 else
3167 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3168
3169 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3170
3171 /* Check that the expansion yielded something useful. */
3172 if (hostlist == NULL)
3173 {
3174 addrlist->message =
3175 string_sprintf("%s transport has empty hosts setting", tblock->name);
3176 addrlist->transport_return = PANIC;
3177 return FALSE; /* Only top address has status */
3178 }
3179
3180 /* If there was no expansion of hosts, save the host list for
3181 next time. */
3182
3183 if (!expanded_hosts) ob->hostlist = hostlist;
3184 }
3185
3186 /* This is not the first time this transport has been run in this delivery;
3187 the host list was built previously. */
3188
3189 else
3190 hostlist = ob->hostlist;
3191 }
3192
3193 /* The host list was supplied with the address. If hosts_randomize is set, we
3194 must sort it into a random order if it did not come from MX records and has not
3195 already been randomized (but don't bother if continuing down an existing
3196 connection). */
3197
3198 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3199 {
3200 host_item *newlist = NULL;
3201 while (hostlist != NULL)
3202 {
3203 host_item *h = hostlist;
3204 hostlist = hostlist->next;
3205
3206 h->sort_key = random_number(100);
3207
3208 if (newlist == NULL)
3209 {
3210 h->next = NULL;
3211 newlist = h;
3212 }
3213 else if (h->sort_key < newlist->sort_key)
3214 {
3215 h->next = newlist;
3216 newlist = h;
3217 }
3218 else
3219 {
3220 host_item *hh = newlist;
3221 while (hh->next != NULL)
3222 {
3223 if (h->sort_key < hh->next->sort_key) break;
3224 hh = hh->next;
3225 }
3226 h->next = hh->next;
3227 hh->next = h;
3228 }
3229 }
3230
3231 hostlist = addrlist->host_list = newlist;
3232 }
3233
3234 /* Sort out the default port. */
3235
3236 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3237
3238 /* For each host-plus-IP-address on the list:
3239
3240 . If this is a continued delivery and the host isn't the one with the
3241 current connection, skip.
3242
3243 . If the status is unusable (i.e. previously failed or retry checked), skip.
3244
3245 . If no IP address set, get the address, either by turning the name into
3246 an address, calling gethostbyname if gethostbyname is on, or by calling
3247 the DNS. The DNS may yield multiple addresses, in which case insert the
3248 extra ones into the list.
3249
3250 . Get the retry data if not previously obtained for this address and set the
3251 field which remembers the state of this address. Skip if the retry time is
3252 not reached. If not, remember whether retry data was found. The retry string
3253 contains both the name and the IP address.
3254
3255 . Scan the list of addresses and mark those whose status is DEFER as
3256 PENDING_DEFER. These are the only ones that will be processed in this cycle
3257 of the hosts loop.
3258
3259 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3260 Some addresses may be successfully delivered, others may fail, and yet
3261 others may get temporary errors and so get marked DEFER.
3262
3263 . The return from the delivery attempt is OK if a connection was made and a
3264 valid SMTP dialogue was completed. Otherwise it is DEFER.
3265
3266 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3267
3268 . If fail to connect, or other defer state, add a retry item.
3269
3270 . If there are any addresses whose status is still DEFER, carry on to the
3271 next host/IPaddress, unless we have tried the number of hosts given
3272 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3273 there is some fancy logic for hosts_max_try that means its limit can be
3274 overstepped in some circumstances.
3275
3276 If we get to the end of the list, all hosts have deferred at least one address,
3277 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3278 delivery attempt to those hosts whose last try was before the arrival time of
3279 the current message. To cope with this, we have to go round the loop a second
3280 time. After that, set the status and error data for any addresses that haven't
3281 had it set already. */
3282
3283 for (cutoff_retry = 0; expired &&
3284 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3285 cutoff_retry++)
3286 {
3287 host_item *nexthost = NULL;
3288 int unexpired_hosts_tried = 0;
3289
3290 for (host = hostlist;
3291 host != NULL &&
3292 unexpired_hosts_tried < ob->hosts_max_try &&
3293 total_hosts_tried < ob->hosts_max_try_hardlimit;
3294 host = nexthost)
3295 {
3296 int rc;
3297 int host_af;
3298 uschar *rs;
3299 BOOL serialized = FALSE;
3300 BOOL host_is_expired = FALSE;
3301 BOOL message_defer = FALSE;
3302 BOOL some_deferred = FALSE;
3303 address_item *first_addr = NULL;
3304 uschar *interface = NULL;
3305 uschar *retry_host_key = NULL;
3306 uschar *retry_message_key = NULL;
3307 uschar *serialize_key = NULL;
3308
3309 /* Default next host is next host. :-) But this can vary if the
3310 hosts_max_try limit is hit (see below). It may also be reset if a host
3311 address is looked up here (in case the host was multihomed). */
3312
3313 nexthost = host->next;
3314
3315 /* If the address hasn't yet been obtained from the host name, look it up
3316 now, unless the host is already marked as unusable. If it is marked as
3317 unusable, it means that the router was unable to find its IP address (in
3318 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3319 the lookup failed last time. We don't get this far if *all* MX records
3320 point to non-existent hosts; that is treated as a hard error.
3321
3322 We can just skip this host entirely. When the hosts came from the router,
3323 the address will timeout based on the other host(s); when the address is
3324 looked up below, there is an explicit retry record added.
3325
3326 Note that we mustn't skip unusable hosts if the address is not unset; they
3327 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3328
3329 if (host->address == NULL)
3330 {
3331 int new_port, flags;
3332 host_item *hh;
3333
3334 if (host->status >= hstatus_unusable)
3335 {
3336 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3337 host->name);
3338 continue;
3339 }
3340
3341 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3342
3343 /* The host name is permitted to have an attached port. Find it, and
3344 strip it from the name. Just remember it for now. */
3345
3346 new_port = host_item_get_port(host);
3347
3348 /* Count hosts looked up */
3349
3350 hosts_looked_up++;
3351
3352 /* Find by name if so configured, or if it's an IP address. We don't
3353 just copy the IP address, because we need the test-for-local to happen. */
3354
3355 flags = HOST_FIND_BY_A;
3356 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3357 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3358
3359 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3360 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3361 else
3362 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3363 &ob->dnssec, /* domains for request/require */
3364 NULL, NULL);
3365
3366 /* Update the host (and any additional blocks, resulting from
3367 multihoming) with a host-specific port, if any. */
3368
3369 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3370
3371 /* Failure to find the host at this time (usually DNS temporary failure)
3372 is really a kind of routing failure rather than a transport failure.
3373 Therefore we add a retry item of the routing kind, not to stop us trying
3374 to look this name up here again, but to ensure the address gets timed
3375 out if the failures go on long enough. A complete failure at this point
3376 commonly points to a configuration error, but the best action is still
3377 to carry on for the next host. */
3378
3379 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3380 {
3381 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3382 expired = FALSE;
3383 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3384 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3385 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3386 host->status = hstatus_unusable;
3387
3388 for (addr = addrlist; addr != NULL; addr = addr->next)
3389 {
3390 if (addr->transport_return != DEFER) continue;
3391 addr->basic_errno = ERRNO_UNKNOWNHOST;
3392 addr->message =
3393 string_sprintf("failed to lookup IP address for %s", host->name);
3394 }
3395 continue;
3396 }
3397
3398 /* If the host is actually the local host, we may have a problem, or
3399 there may be some cunning configuration going on. In the problem case,
3400 log things and give up. The default transport status is already DEFER. */
3401
3402 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3403 {
3404 for (addr = addrlist; addr != NULL; addr = addr->next)
3405 {
3406 addr->basic_errno = 0;
3407 addr->message = string_sprintf("%s transport found host %s to be "
3408 "local", tblock->name, host->name);
3409 }
3410 goto END_TRANSPORT;
3411 }
3412 } /* End of block for IP address lookup */
3413
3414 /* If this is a continued delivery, we are interested only in the host
3415 which matches the name of the existing open channel. The check is put
3416 here after the local host lookup, in case the name gets expanded as a
3417 result of the lookup. Set expired FALSE, to save the outer loop executing
3418 twice. */
3419
3420 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3421 Ustrcmp(continue_host_address, host->address) != 0))
3422 {
3423 expired = FALSE;
3424 continue; /* With next host */
3425 }
3426
3427 /* Reset the default next host in case a multihomed host whose addresses
3428 are not looked up till just above added to the host list. */
3429
3430 nexthost = host->next;
3431
3432 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3433 domain is in queue_smtp_domains, we don't actually want to attempt any
3434 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3435 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3436 were not in it. We don't want to hold up all SMTP deliveries! Except when
3437 doing a two-stage queue run, don't do this if forcing. */
3438
3439 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3440 match_isinlist(addrlist->domain,
3441 (const uschar **)&queue_smtp_domains, 0,
3442 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3443 {
3444 expired = FALSE;
3445 for (addr = addrlist; addr != NULL; addr = addr->next)
3446 {
3447 if (addr->transport_return != DEFER) continue;
3448 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3449 }
3450 continue; /* With next host */
3451 }
3452
3453 /* Count hosts being considered - purely for an intelligent comment
3454 if none are usable. */
3455
3456 hosts_total++;
3457
3458 /* Set $host and $host address now in case they are needed for the
3459 interface expansion or the serialize_hosts check; they remain set if an
3460 actual delivery happens. */
3461
3462 deliver_host = host->name;
3463 deliver_host_address = host->address;
3464 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3465 : host->dnssec == DS_NO ? US"no"
3466 : US"";
3467
3468 /* Set up a string for adding to the retry key if the port number is not
3469 the standard SMTP port. A host may have its own port setting that overrides
3470 the default. */
3471
3472 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3473 port : host->port);
3474 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3475
3476 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3477 string is set, even if constant (as different transports can have different
3478 constant settings), we must add it to the key that is used for retries,
3479 because connections to the same host from a different interface should be
3480 treated separately. */
3481
3482 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3483 if ((rs = ob->interface) && *rs)
3484 {
3485 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3486 return FALSE;
3487 pistring = string_sprintf("%s/%s", pistring, interface);
3488 }
3489
3490 /* The first time round the outer loop, check the status of the host by
3491 inspecting the retry data. The second time round, we are interested only
3492 in expired hosts that haven't been tried since this message arrived. */
3493
3494 if (cutoff_retry == 0)
3495 {
3496 BOOL incl_ip;
3497 /* Ensure the status of the address is set by checking retry data if
3498 necessary. There may be host-specific retry data (applicable to all
3499 messages) and also data for retries of a specific message at this host.
3500 If either of these retry records are actually read, the keys used are
3501 returned to save recomputing them later. */
3502
3503 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3504 US"retry_include_ip_address", ob->retry_include_ip_address,
3505 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3506 continue; /* with next host */
3507
3508 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3509 incl_ip, &retry_host_key, &retry_message_key);
3510
3511 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3512 (host->address == NULL)? US"" : host->address, pistring,
3513 (host->status == hstatus_usable)? "usable" :
3514 (host->status == hstatus_unusable)? "unusable" :
3515 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3516
3517 /* Skip this address if not usable at this time, noting if it wasn't
3518 actually expired, both locally and in the address. */
3519
3520 switch (host->status)
3521 {
3522 case hstatus_unusable:
3523 expired = FALSE;
3524 setflag(addrlist, af_retry_skipped);
3525 /* Fall through */
3526
3527 case hstatus_unusable_expired:
3528 switch (host->why)
3529 {
3530 case hwhy_retry: hosts_retry++; break;
3531 case hwhy_failed: hosts_fail++; break;
3532 case hwhy_deferred: hosts_defer++; break;
3533 }
3534
3535 /* If there was a retry message key, implying that previously there
3536 was a message-specific defer, we don't want to update the list of
3537 messages waiting for these hosts. */
3538
3539 if (retry_message_key != NULL) update_waiting = FALSE;
3540 continue; /* With the next host or IP address */
3541 }
3542 }
3543
3544 /* Second time round the loop: if the address is set but expired, and
3545 the message is newer than the last try, let it through. */
3546
3547 else
3548 {
3549 if (host->address == NULL ||
3550 host->status != hstatus_unusable_expired ||
3551 host->last_try > received_time)
3552 continue;
3553 DEBUG(D_transport)
3554 debug_printf("trying expired host %s [%s]%s\n",
3555 host->name, host->address, pistring);
3556 host_is_expired = TRUE;
3557 }
3558
3559 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3560 it remains TRUE only if all hosts are expired and none are actually tried.
3561 */
3562
3563 expired = FALSE;
3564
3565 /* If this host is listed as one to which access must be serialized,
3566 see if another Exim process has a connection to it, and if so, skip
3567 this host. If not, update the database to record our connection to it
3568 and remember this for later deletion. Do not do any of this if we are
3569 sending the message down a pre-existing connection. */
3570
3571 if (!continuing &&
3572 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3573 {
3574 serialize_key = string_sprintf("host-serialize-%s", host->name);
3575 if (!enq_start(serialize_key, 1))
3576 {
3577 DEBUG(D_transport)
3578 debug_printf("skipping host %s because another Exim process "
3579 "is connected to it\n", host->name);
3580 hosts_serial++;
3581 continue;
3582 }
3583 serialized = TRUE;
3584 }
3585
3586 /* OK, we have an IP address that is not waiting for its retry time to
3587 arrive (it might be expired) OR (second time round the loop) we have an
3588 expired host that hasn't been tried since the message arrived. Have a go
3589 at delivering the message to it. First prepare the addresses by flushing
3590 out the result of previous attempts, and finding the first address that
3591 is still to be delivered. */
3592
3593 first_addr = prepare_addresses(addrlist, host);
3594
3595 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3596 message_id, host->name, host->address, addrlist->address,
3597 (addrlist->next == NULL)? "" : ", ...");
3598
3599 set_process_info("delivering %s to %s [%s] (%s%s)",
3600 message_id, host->name, host->address, addrlist->address,
3601 (addrlist->next == NULL)? "" : ", ...");
3602
3603 /* This is not for real; don't do the delivery. If there are
3604 any remaining hosts, list them. */
3605
3606 if (dont_deliver)
3607 {
3608 host_item *host2;
3609 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3610 for (addr = addrlist; addr != NULL; addr = addr->next)
3611 {
3612 addr->host_used = host;
3613 addr->special_action = '*';
3614 addr->message = US"delivery bypassed by -N option";
3615 }
3616 DEBUG(D_transport)
3617 {
3618 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3619 "*** host and remaining hosts:\n", tblock->name);
3620 for (host2 = host; host2 != NULL; host2 = host2->next)
3621 debug_printf(" %s [%s]\n", host2->name,
3622 (host2->address == NULL)? US"unset" : host2->address);
3623 }
3624 rc = OK;
3625 }
3626
3627 /* This is for real. If the host is expired, we don't count it for
3628 hosts_max_retry. This ensures that all hosts must expire before an address
3629 is timed out, unless hosts_max_try_hardlimit (which protects against
3630 lunatic DNS configurations) is reached.
3631
3632 If the host is not expired and we are about to hit the hosts_max_retry
3633 limit, check to see if there is a subsequent hosts with a different MX
3634 value. If so, make that the next host, and don't count this one. This is a
3635 heuristic to make sure that different MXs do get tried. With a normal kind
3636 of retry rule, they would get tried anyway when the earlier hosts were
3637 delayed, but if the domain has a "retry every time" type of rule - as is
3638 often used for the the very large ISPs, that won't happen. */
3639
3640 else
3641 {
3642 host_item * thost;
3643 /* Make a copy of the host if it is local to this invocation
3644 of the transport. */
3645
3646 if (expanded_hosts)
3647 {
3648 thost = store_get(sizeof(host_item));
3649 *thost = *host;
3650 thost->name = string_copy(host->name);
3651 thost->address = string_copy(host->address);
3652 }
3653 else
3654 thost = host;
3655
3656 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3657 {
3658 host_item *h;
3659 DEBUG(D_transport)
3660 debug_printf("hosts_max_try limit reached with this host\n");
3661 for (h = host; h; h = h->next) if (h->mx != host->mx)
3662 {
3663 nexthost = h;
3664 unexpired_hosts_tried--;
3665 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3666 "and will be tried\n");
3667 break;
3668 }
3669 }
3670
3671 /* Attempt the delivery. */
3672
3673 total_hosts_tried++;
3674 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3675 &message_defer, FALSE);
3676
3677 /* Yield is one of:
3678 OK => connection made, each address contains its result;
3679 message_defer is set for message-specific defers (when all
3680 recipients are marked defer)
3681 DEFER => there was a non-message-specific delivery problem;
3682 ERROR => there was a problem setting up the arguments for a filter,
3683 or there was a problem with expanding added headers
3684 */
3685
3686 /* If the result is not OK, there was a non-message-specific problem.
3687 If the result is DEFER, we need to write to the logs saying what happened
3688 for this particular host, except in the case of authentication and TLS
3689 failures, where the log has already been written. If all hosts defer a
3690 general message is written at the end. */
3691
3692 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3693 first_addr->basic_errno != ERRNO_TLSFAILURE)
3694 write_logs(first_addr, host);
3695
3696 #ifndef DISABLE_EVENT
3697 if (rc == DEFER)
3698 deferred_event_raise(first_addr, host);
3699 #endif
3700
3701 /* If STARTTLS was accepted, but there was a failure in setting up the
3702 TLS session (usually a certificate screwup), and the host is not in
3703 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3704 TLS forcibly turned off. We have to start from scratch with a new SMTP
3705 connection. That's why the retry is done from here, not from within
3706 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3707 session, so the in-clear transmission after those errors, if permitted,
3708 happens inside smtp_deliver().] */
3709
3710 #ifdef SUPPORT_TLS
3711 if ( rc == DEFER
3712 && first_addr->basic_errno == ERRNO_TLSFAILURE
3713 && ob->tls_tempfail_tryclear
3714 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3715 )
3716 {
3717 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3718 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3719 first_addr = prepare_addresses(addrlist, host);
3720 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3721 &message_defer, TRUE);
3722 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3723 write_logs(first_addr, host);
3724 # ifndef DISABLE_EVENT
3725 if (rc == DEFER)
3726 deferred_event_raise(first_addr, host);
3727 # endif
3728 }
3729 #endif /*SUPPORT_TLS*/
3730 }
3731
3732 /* Delivery attempt finished */
3733
3734 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3735 US"ERROR" : US"?";
3736
3737 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3738 message_id, host->name, host->address, addrlist->address,
3739 (addrlist->next == NULL)? "" : " (& others)", rs);
3740
3741 /* Release serialization if set up */
3742
3743 if (serialized) enq_end(serialize_key);
3744
3745 /* If the result is DEFER, or if a host retry record is known to exist, we
3746 need to add an item to the retry chain for updating the retry database
3747 at the end of delivery. We only need to add the item to the top address,
3748 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3749 for any other delivery attempts using the same address. (It is copied into
3750 the unusable tree at the outer level, so even if different address blocks
3751 contain the same address, it still won't get tried again.) */
3752
3753 if (rc == DEFER || retry_host_key != NULL)
3754 {
3755 int delete_flag = (rc != DEFER)? rf_delete : 0;
3756 if (retry_host_key == NULL)
3757 {
3758 BOOL incl_ip;
3759 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3760 US"retry_include_ip_address", ob->retry_include_ip_address,
3761 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3762 incl_ip = TRUE; /* error; use most-specific retry record */
3763
3764 retry_host_key = incl_ip ?
3765 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3766 string_sprintf("T:%S%s", host->name, pistring);
3767 }
3768
3769 /* If a delivery of another message over an existing SMTP connection
3770 yields DEFER, we do NOT set up retry data for the host. This covers the
3771 case when there are delays in routing the addresses in the second message
3772 that are so long that the server times out. This is alleviated by not
3773 routing addresses that previously had routing defers when handling an
3774 existing connection, but even so, this case may occur (e.g. if a
3775 previously happily routed address starts giving routing defers). If the
3776 host is genuinely down, another non-continued message delivery will
3777 notice it soon enough. */
3778
3779 if (delete_flag != 0 || !continuing)
3780 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3781
3782 /* We may have tried an expired host, if its retry time has come; ensure
3783 the status reflects the expiry for the benefit of any other addresses. */
3784
3785 if (rc == DEFER)
3786 {
3787 host->status = (host_is_expired)?
3788 hstatus_unusable_expired : hstatus_unusable;
3789 host->why = hwhy_deferred;
3790 }
3791 }
3792
3793 /* If message_defer is set (host was OK, but every recipient got deferred
3794 because of some message-specific problem), or if that had happened
3795 previously so that a message retry key exists, add an appropriate item
3796 to the retry chain. Note that if there was a message defer but now there is
3797 a host defer, the message defer record gets deleted. That seems perfectly
3798 reasonable. Also, stop the message from being remembered as waiting
3799 for specific hosts. */
3800
3801 if (message_defer || retry_message_key != NULL)
3802 {
3803 int delete_flag = message_defer? 0 : rf_delete;
3804 if (retry_message_key == NULL)
3805 {
3806 BOOL incl_ip;
3807 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3808 US"retry_include_ip_address", ob->retry_include_ip_address,
3809 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3810 incl_ip = TRUE; /* error; use most-specific retry record */
3811
3812 retry_message_key = incl_ip ?
3813 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3814 message_id) :
3815 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3816 }
3817 retry_add_item(addrlist, retry_message_key,
3818 rf_message | rf_host | delete_flag);
3819 update_waiting = FALSE;
3820 }
3821
3822 /* Any return other than DEFER (that is, OK or ERROR) means that the
3823 addresses have got their final statuses filled in for this host. In the OK
3824 case, see if any of them are deferred. */
3825
3826 if (rc == OK)
3827 for (addr = addrlist; addr; addr = addr->next)
3828 if (addr->transport_return == DEFER)
3829 {
3830 some_deferred = TRUE;
3831 break;
3832 }
3833
3834 /* If no addresses deferred or the result was ERROR, return. We do this for
3835 ERROR because a failing filter set-up or add_headers expansion is likely to
3836 fail for any host we try. */
3837
3838 if (rc == ERROR || (rc == OK && !some_deferred))
3839 {
3840 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3841 return TRUE; /* Each address has its status */
3842 }
3843
3844 /* If the result was DEFER or some individual addresses deferred, let
3845 the loop run to try other hosts with the deferred addresses, except for the
3846 case when we were trying to deliver down an existing channel and failed.
3847 Don't try any other hosts in this case. */
3848
3849 if (continuing) break;
3850
3851 /* If the whole delivery, or some individual addresses, were deferred and
3852 there are more hosts that could be tried, do not count this host towards
3853 the hosts_max_try limit if the age of the message is greater than the
3854 maximum retry time for this host. This means we may try try all hosts,
3855 ignoring the limit, when messages have been around for some time. This is
3856 important because if we don't try all hosts, the address will never time
3857 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3858
3859 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3860 {
3861 BOOL timedout;
3862 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3863
3864 if (retry != NULL && retry->rules != NULL)
3865 {
3866 retry_rule *last_rule;
3867 for (last_rule = retry->rules;
3868 last_rule->next != NULL;
3869 last_rule = last_rule->next);
3870 timedout = time(NULL) - received_time > last_rule->timeout;
3871 }
3872 else timedout = TRUE; /* No rule => timed out */
3873
3874 if (timedout)
3875 {
3876 unexpired_hosts_tried--;
3877 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3878 "hosts_max_try (message older than host's retry time)\n");
3879 }
3880 }
3881 } /* End of loop for trying multiple hosts. */
3882
3883 /* This is the end of the loop that repeats iff expired is TRUE and
3884 ob->delay_after_cutoff is FALSE. The second time round we will
3885 try those hosts that haven't been tried since the message arrived. */
3886
3887 DEBUG(D_transport)
3888 {
3889 debug_printf("all IP addresses skipped or deferred at least one address\n");
3890 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3891 debug_printf("retrying IP addresses not tried since message arrived\n");
3892 }
3893 }
3894
3895
3896 /* Get here if all IP addresses are skipped or defer at least one address. In
3897 MUA wrapper mode, this will happen only for connection or other non-message-
3898 specific failures. Force the delivery status for all addresses to FAIL. */
3899
3900 if (mua_wrapper)
3901 {
3902 for (addr = addrlist; addr != NULL; addr = addr->next)
3903 addr->transport_return = FAIL;
3904 goto END_TRANSPORT;
3905 }
3906
3907 /* In the normal, non-wrapper case, add a standard message to each deferred
3908 address if there hasn't been an error, that is, if it hasn't actually been
3909 tried this time. The variable "expired" will be FALSE if any deliveries were
3910 actually tried, or if there was at least one host that was not expired. That
3911 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3912 a delivery has been tried, an error code will be set, and the failing of the
3913 message is handled by the retry code later.
3914
3915 If queue_smtp is set, or this transport was called to send a subsequent message
3916 down an existing TCP/IP connection, and something caused the host not to be
3917 found, we end up here, but can detect these cases and handle them specially. */
3918
3919 for (addr = addrlist; addr != NULL; addr = addr->next)
3920 {
3921 /* If host is not NULL, it means that we stopped processing the host list
3922 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3923 means we need to behave as if some hosts were skipped because their retry
3924 time had not come. Specifically, this prevents the address from timing out.
3925 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3926 hosts were tried. */
3927
3928 if (host != NULL)
3929 {
3930 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3931 {
3932 DEBUG(D_transport)
3933 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3934 "hosts were tried\n");
3935 }
3936 else
3937 {
3938 DEBUG(D_transport)
3939 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3940 setflag(addr, af_retry_skipped);
3941 }
3942 }
3943
3944 if (queue_smtp) /* no deliveries attempted */
3945 {
3946 addr->transport_return = DEFER;
3947 addr->basic_errno = 0;
3948 addr->message = US"SMTP delivery explicitly queued";
3949 }
3950
3951 else if (addr->transport_return == DEFER &&
3952 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3953 addr->message == NULL)
3954 {
3955 addr->basic_errno = ERRNO_HRETRY;
3956 if (continue_hostname != NULL)
3957 {
3958 addr->message = US"no host found for existing SMTP connection";
3959 }
3960 else if (expired)
3961 {
3962 setflag(addr, af_pass_message); /* This is not a security risk */
3963 addr->message = ob->delay_after_cutoff
3964 ? US"retry time not reached for any host after a long failure period"
3965 : US"all hosts have been failing for a long time and were last tried "
3966 "after this message arrived";
3967
3968 /* If we are already using fallback hosts, or there are no fallback hosts
3969 defined, convert the result to FAIL to cause a bounce. */
3970
3971 if (addr->host_list == addr->fallback_hosts ||
3972 addr->fallback_hosts == NULL)
3973 addr->transport_return = FAIL;
3974 }
3975 else
3976 {
3977 const uschar * s;
3978 if (hosts_retry == hosts_total)
3979 s = US"retry time not reached for any host%s";
3980 else if (hosts_fail == hosts_total)
3981 s = US"all host address lookups%s failed permanently";
3982 else if (hosts_defer == hosts_total)
3983 s = US"all host address lookups%s failed temporarily";
3984 else if (hosts_serial == hosts_total)
3985 s = US"connection limit reached for all hosts%s";
3986 else if (hosts_fail+hosts_defer == hosts_total)
3987 s = US"all host address lookups%s failed";
3988 else
3989 s = US"some host address lookups failed and retry time "
3990 "not reached for other hosts or connection limit reached%s";
3991
3992 addr->message = string_sprintf(s,
3993 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3994 }
3995 }
3996 }
3997
3998 /* Update the database which keeps information about which messages are waiting
3999 for which hosts to become available. For some message-specific errors, the
4000 update_waiting flag is turned off because we don't want follow-on deliveries in
4001 those cases. If this transport instance is explicitly limited to one message
4002 per connection then follow-on deliveries are not possible and there's no need
4003 to create/update the per-transport wait-<transport_name> database. */
4004
4005 if (update_waiting && tblock->connection_max_messages != 1)
4006 transport_update_waiting(hostlist, tblock->name);
4007
4008 END_TRANSPORT:
4009
4010 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4011
4012 return TRUE; /* Each address has its status */
4013 }
4014
4015 /* vi: aw ai sw=2
4016 */
4017 /* End of transport/smtp.c */
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