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