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I18N: support IDNA2008. Bug 1911
[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 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
129 #ifndef DISABLE_PRDR
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 #endif
133 #ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136 #endif
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
157 #ifdef SUPPORT_SOCKS
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 #endif
161 #ifdef SUPPORT_TLS
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
184 #endif
185 };
186
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
189
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
193 /* Default private options block for the smtp transport. */
194
195 smtp_transport_options_block smtp_transport_option_defaults = {
196 NULL, /* hosts */
197 NULL, /* fallback_hosts */
198 NULL, /* hostlist */
199 NULL, /* fallback_hostlist */
200 NULL, /* authenticated_sender */
201 US"$primary_hostname", /* helo_data */
202 NULL, /* interface */
203 NULL, /* port */
204 US"smtp", /* protocol */
205 NULL, /* DSCP */
206 NULL, /* serialize_hosts */
207 NULL, /* hosts_try_auth */
208 NULL, /* hosts_require_auth */
209 US"*", /* hosts_try_chunking */
210 #ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
212 NULL, /* hosts_require_dane */
213 #endif
214 NULL, /* hosts_try_fastopen */
215 #ifndef DISABLE_PRDR
216 US"*", /* hosts_try_prdr */
217 #endif
218 #ifndef DISABLE_OCSP
219 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
220 NULL, /* hosts_require_ocsp */
221 #endif
222 NULL, /* hosts_require_tls */
223 NULL, /* hosts_avoid_tls */
224 NULL, /* hosts_verify_avoid_tls */
225 NULL, /* hosts_avoid_pipelining */
226 NULL, /* hosts_avoid_esmtp */
227 NULL, /* hosts_nopass_tls */
228 5*60, /* command_timeout */
229 5*60, /* connect_timeout; shorter system default overrides */
230 5*60, /* data timeout */
231 10*60, /* final timeout */
232 1024, /* size_addition */
233 5, /* hosts_max_try */
234 50, /* hosts_max_try_hardlimit */
235 TRUE, /* address_retry_include_sender */
236 FALSE, /* allow_localhost */
237 FALSE, /* authenticated_sender_force */
238 FALSE, /* gethostbyname */
239 TRUE, /* dns_qualify_single */
240 FALSE, /* dns_search_parents */
241 { NULL, NULL }, /* dnssec_domains {request,require} */
242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
246 FALSE, /* lmtp_ignore_quota */
247 NULL, /* expand_retry_include_ip_address */
248 TRUE /* retry_include_ip_address */
249 #ifdef SUPPORT_SOCKS
250 ,NULL /* socks_proxy */
251 #endif
252 #ifdef SUPPORT_TLS
253 ,NULL, /* tls_certificate */
254 NULL, /* tls_crl */
255 NULL, /* tls_privatekey */
256 NULL, /* tls_require_ciphers */
257 NULL, /* tls_sni */
258 US"system", /* tls_verify_certificates */
259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
263 US"*", /* tls_try_verify_hosts */
264 US"*" /* tls_verify_cert_hostnames */
265 #endif
266 #ifndef DISABLE_DKIM
267 , {NULL, /* dkim_canon */
268 NULL, /* dkim_domain */
269 NULL, /* dkim_private_key */
270 NULL, /* dkim_selector */
271 NULL, /* dkim_sign_headers */
272 NULL, /* dkim_strict */
273 FALSE} /* dot_stuffed */
274 #endif
275 };
276
277 /* some DSN flags for use later */
278
279 static int rf_list[] = {rf_notify_never, rf_notify_success,
280 rf_notify_failure, rf_notify_delay };
281
282 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
283
284
285
286 /* Local statics */
287
288 static uschar *smtp_command; /* Points to last cmd for error messages */
289 static uschar *mail_command; /* Points to MAIL cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
291 static BOOL pipelining_active; /* current transaction is in pipe mode */
292
293
294 /*************************************************
295 * Setup entry point *
296 *************************************************/
297
298 /* This function is called when the transport is about to be used,
299 but before running it in a sub-process. It is used for two things:
300
301 (1) To set the fallback host list in addresses, when delivering.
302 (2) To pass back the interface, port, protocol, and other options, for use
303 during callout verification.
304
305 Arguments:
306 tblock pointer to the transport instance block
307 addrlist list of addresses about to be transported
308 tf if not NULL, pointer to block in which to return options
309 uid the uid that will be set (not used)
310 gid the gid that will be set (not used)
311 errmsg place for error message (not used)
312
313 Returns: OK always (FAIL, DEFER not used)
314 */
315
316 static int
317 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
318 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
319 {
320 smtp_transport_options_block *ob =
321 (smtp_transport_options_block *)(tblock->options_block);
322
323 errmsg = errmsg; /* Keep picky compilers happy */
324 uid = uid;
325 gid = gid;
326
327 /* Pass back options if required. This interface is getting very messy. */
328
329 if (tf != NULL)
330 {
331 tf->interface = ob->interface;
332 tf->port = ob->port;
333 tf->protocol = ob->protocol;
334 tf->hosts = ob->hosts;
335 tf->hosts_override = ob->hosts_override;
336 tf->hosts_randomize = ob->hosts_randomize;
337 tf->gethostbyname = ob->gethostbyname;
338 tf->qualify_single = ob->dns_qualify_single;
339 tf->search_parents = ob->dns_search_parents;
340 tf->helo_data = ob->helo_data;
341 }
342
343 /* Set the fallback host list for all the addresses that don't have fallback
344 host lists, provided that the local host wasn't present in the original host
345 list. */
346
347 if (!testflag(addrlist, af_local_host_removed))
348 {
349 for (; addrlist != NULL; addrlist = addrlist->next)
350 if (addrlist->fallback_hosts == NULL)
351 addrlist->fallback_hosts = ob->fallback_hostlist;
352 }
353
354 return OK;
355 }
356
357
358
359 /*************************************************
360 * Initialization entry point *
361 *************************************************/
362
363 /* Called for each instance, after its options have been read, to
364 enable consistency checks to be done, or anything else that needs
365 to be set up.
366
367 Argument: pointer to the transport instance block
368 Returns: nothing
369 */
370
371 void
372 smtp_transport_init(transport_instance *tblock)
373 {
374 smtp_transport_options_block *ob =
375 (smtp_transport_options_block *)(tblock->options_block);
376
377 /* Retry_use_local_part defaults FALSE if unset */
378
379 if (tblock->retry_use_local_part == TRUE_UNSET)
380 tblock->retry_use_local_part = FALSE;
381
382 /* Set the default port according to the protocol */
383
384 if (ob->port == NULL)
385 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
386 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
387
388 /* Set up the setup entry point, to be called before subprocesses for this
389 transport. */
390
391 tblock->setup = smtp_transport_setup;
392
393 /* Complain if any of the timeouts are zero. */
394
395 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
396 ob->final_timeout <= 0)
397 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
398 "command, data, or final timeout value is zero for %s transport",
399 tblock->name);
400
401 /* If hosts_override is set and there are local hosts, set the global
402 flag that stops verify from showing router hosts. */
403
404 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
405
406 /* If there are any fallback hosts listed, build a chain of host items
407 for them, but do not do any lookups at this time. */
408
409 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
410 }
411
412
413
414
415
416 /*************************************************
417 * Set delivery info into all active addresses *
418 *************************************************/
419
420 /* Only addresses whose status is >= PENDING are relevant. A lesser
421 status means that an address is not currently being processed.
422
423 Arguments:
424 addrlist points to a chain of addresses
425 errno_value to put in each address's errno field
426 msg to put in each address's message field
427 rc to put in each address's transport_return field
428 pass_message if TRUE, set the "pass message" flag in the address
429 host if set, mark addrs as having used this host
430 smtp_greeting from peer
431 helo_response from peer
432
433 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
434 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
435 this particular type of timeout.
436
437 Returns: nothing
438 */
439
440 static void
441 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
442 BOOL pass_message, host_item * host
443 #ifdef EXPERIMENTAL_DSN_INFO
444 , const uschar * smtp_greeting, const uschar * helo_response
445 #endif
446 )
447 {
448 address_item *addr;
449 int orvalue = 0;
450 if (errno_value == ERRNO_CONNECTTIMEOUT)
451 {
452 errno_value = ETIMEDOUT;
453 orvalue = RTEF_CTOUT;
454 }
455 for (addr = addrlist; addr; addr = addr->next)
456 if (addr->transport_return >= PENDING)
457 {
458 addr->basic_errno = errno_value;
459 addr->more_errno |= orvalue;
460 if (msg != NULL)
461 {
462 addr->message = msg;
463 if (pass_message) setflag(addr, af_pass_message);
464 }
465 addr->transport_return = rc;
466 if (host)
467 {
468 addr->host_used = host;
469 #ifdef EXPERIMENTAL_DSN_INFO
470 if (smtp_greeting)
471 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
472 addr->smtp_greeting = smtp_greeting;
473
474 if (helo_response)
475 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
476 addr->helo_response = helo_response;
477 #endif
478 }
479 }
480 }
481
482 static void
483 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
484 BOOL pass_message)
485 {
486 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
487 #ifdef EXPERIMENTAL_DSN_INFO
488 , NULL, NULL
489 #endif
490 );
491 }
492
493
494 /*************************************************
495 * Check an SMTP response *
496 *************************************************/
497
498 /* This function is given an errno code and the SMTP response buffer
499 to analyse, together with the host identification for generating messages. It
500 sets an appropriate message and puts the first digit of the response code into
501 the yield variable. If no response was actually read, a suitable digit is
502 chosen.
503
504 Arguments:
505 host the current host, to get its name for messages
506 errno_value pointer to the errno value
507 more_errno from the top address for use with ERRNO_FILTER_FAIL
508 buffer the SMTP response buffer
509 yield where to put a one-digit SMTP response code
510 message where to put an errror message
511 pass_message set TRUE if message is an SMTP response
512
513 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
514 */
515
516 static BOOL
517 check_response(host_item *host, int *errno_value, int more_errno,
518 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
519 {
520 uschar * pl = pipelining_active ? US"pipelined " : US"";
521
522 *yield = '4'; /* Default setting is to give a temporary error */
523
524 /* Handle response timeout */
525
526 if (*errno_value == ETIMEDOUT)
527 {
528 *message = US string_sprintf("SMTP timeout after %s%s",
529 pl, smtp_command);
530 if (transport_count > 0)
531 *message = US string_sprintf("%s (%d bytes written)", *message,
532 transport_count);
533 return FALSE;
534 }
535
536 /* Handle malformed SMTP response */
537
538 if (*errno_value == ERRNO_SMTPFORMAT)
539 {
540 const uschar *malfresp = string_printing(buffer);
541 while (isspace(*malfresp)) malfresp++;
542 *message = *malfresp == 0
543 ? string_sprintf("Malformed SMTP reply (an empty line) "
544 "in response to %s%s", pl, smtp_command)
545 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
546 pl, smtp_command, malfresp);
547 return FALSE;
548 }
549
550 /* Handle a failed filter process error; can't send QUIT as we mustn't
551 end the DATA. */
552
553 if (*errno_value == ERRNO_FILTER_FAIL)
554 {
555 *message = US string_sprintf("transport filter process failed (%d)%s",
556 more_errno,
557 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
558 return FALSE;
559 }
560
561 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
562 end the DATA. */
563
564 if (*errno_value == ERRNO_CHHEADER_FAIL)
565 {
566 *message =
567 US string_sprintf("failed to expand headers_add or headers_remove: %s",
568 expand_string_message);
569 return FALSE;
570 }
571
572 /* Handle failure to write a complete data block */
573
574 if (*errno_value == ERRNO_WRITEINCOMPLETE)
575 {
576 *message = US string_sprintf("failed to write a data block");
577 return FALSE;
578 }
579
580 #ifdef SUPPORT_I18N
581 /* Handle lack of advertised SMTPUTF8, for international message */
582 if (*errno_value == ERRNO_UTF8_FWD)
583 {
584 *message = US string_sprintf("utf8 support required but not offered for forwarding");
585 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
586 return TRUE;
587 }
588 #endif
589
590 /* Handle error responses from the remote mailer. */
591
592 if (buffer[0] != 0)
593 {
594 const uschar *s = string_printing(buffer);
595 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
596 "%s", pl, smtp_command, s);
597 *pass_message = TRUE;
598 *yield = buffer[0];
599 return TRUE;
600 }
601
602 /* No data was read. If there is no errno, this must be the EOF (i.e.
603 connection closed) case, which causes deferral. An explicit connection reset
604 error has the same effect. Otherwise, put the host's identity in the message,
605 leaving the errno value to be interpreted as well. In all cases, we have to
606 assume the connection is now dead. */
607
608 if (*errno_value == 0 || *errno_value == ECONNRESET)
609 {
610 *errno_value = ERRNO_SMTPCLOSED;
611 *message = US string_sprintf("Remote host closed connection "
612 "in response to %s%s", pl, smtp_command);
613 }
614 else *message = US string_sprintf("%s [%s]", host->name, host->address);
615
616 return FALSE;
617 }
618
619
620
621 /*************************************************
622 * Write error message to logs *
623 *************************************************/
624
625 /* This writes to the main log and to the message log.
626
627 Arguments:
628 addr the address item containing error information
629 host the current host
630
631 Returns: nothing
632 */
633
634 static void
635 write_logs(address_item *addr, host_item *host)
636 {
637 uschar * message = LOGGING(outgoing_port)
638 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
639 host->port == PORT_NONE ? 25 : host->port)
640 : string_sprintf("H=%s [%s]", host->name, host->address);
641
642 if (addr->message)
643 {
644 message = string_sprintf("%s: %s", message, addr->message);
645 if (addr->basic_errno > 0)
646 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
647 log_write(0, LOG_MAIN, "%s", message);
648 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
649 }
650 else
651 {
652 const uschar * s = exim_errstr(addr->basic_errno);
653 log_write(0, LOG_MAIN, "%s %s", message, s);
654 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
655 }
656 }
657
658 static void
659 msglog_line(host_item * host, uschar * message)
660 {
661 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
662 host->name, host->address, message);
663 }
664
665
666
667 #ifndef DISABLE_EVENT
668 /*************************************************
669 * Post-defer action *
670 *************************************************/
671
672 /* This expands an arbitrary per-transport string.
673 It might, for example, be used to write to the database log.
674
675 Arguments:
676 addr the address item containing error information
677 host the current host
678
679 Returns: nothing
680 */
681
682 static void
683 deferred_event_raise(address_item *addr, host_item *host)
684 {
685 uschar * action = addr->transport->event_action;
686 const uschar * save_domain;
687 uschar * save_local;
688
689 if (!action)
690 return;
691
692 save_domain = deliver_domain;
693 save_local = deliver_localpart;
694
695 /*XXX would ip & port already be set up? */
696 deliver_host_address = string_copy(host->address);
697 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
698 event_defer_errno = addr->basic_errno;
699
700 router_name = addr->router->name;
701 transport_name = addr->transport->name;
702 deliver_domain = addr->domain;
703 deliver_localpart = addr->local_part;
704
705 (void) event_raise(action, US"msg:host:defer",
706 addr->message
707 ? addr->basic_errno > 0
708 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
709 : string_copy(addr->message)
710 : addr->basic_errno > 0
711 ? string_copy(US strerror(addr->basic_errno))
712 : NULL);
713
714 deliver_localpart = save_local;
715 deliver_domain = save_domain;
716 router_name = transport_name = NULL;
717 }
718 #endif
719
720 /*************************************************
721 * Synchronize SMTP responses *
722 *************************************************/
723
724 /* This function is called from smtp_deliver() to receive SMTP responses from
725 the server, and match them up with the commands to which they relate. When
726 PIPELINING is not in use, this function is called after every command, and is
727 therefore somewhat over-engineered, but it is simpler to use a single scheme
728 that works both with and without PIPELINING instead of having two separate sets
729 of code.
730
731 The set of commands that are buffered up with pipelining may start with MAIL
732 and may end with DATA; in between are RCPT commands that correspond to the
733 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
734 etc.) are never buffered.
735
736 Errors after MAIL or DATA abort the whole process leaving the response in the
737 buffer. After MAIL, pending responses are flushed, and the original command is
738 re-instated in big_buffer for error messages. For RCPT commands, the remote is
739 permitted to reject some recipient addresses while accepting others. However
740 certain errors clearly abort the whole process. Set the value in
741 transport_return to PENDING_OK if the address is accepted. If there is a
742 subsequent general error, it will get reset accordingly. If not, it will get
743 converted to OK at the end.
744
745 Arguments:
746 addrlist the complete address list
747 include_affixes TRUE if affixes include in RCPT
748 sync_addr ptr to the ptr of the one to start scanning at (updated)
749 host the host we are connected to
750 count the number of responses to read
751 address_retry_
752 include_sender true if 4xx retry is to include the sender it its key
753 pending_MAIL true if the first response is for MAIL
754 pending_DATA 0 if last command sent was not DATA
755 +1 if previously had a good recipient
756 -1 if not previously had a good recipient
757 inblock incoming SMTP block
758 timeout timeout value
759 buffer buffer for reading response
760 buffsize size of buffer
761
762 Returns: 3 if at least one address had 2xx and one had 5xx
763 2 if at least one address had 5xx but none had 2xx
764 1 if at least one host had a 2xx response, but none had 5xx
765 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
766 -1 timeout while reading RCPT response
767 -2 I/O or other non-response error for RCPT
768 -3 DATA or MAIL failed - errno and buffer set
769 */
770
771 static int
772 sync_responses(address_item *addrlist, BOOL include_affixes,
773 address_item **sync_addr, host_item *host, int count,
774 BOOL address_retry_include_sender, BOOL pending_MAIL,
775 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
776 int buffsize)
777 {
778 address_item *addr = *sync_addr;
779 int yield = 0;
780
781 /* Handle the response for a MAIL command. On error, reinstate the original
782 command in big_buffer for error message use, and flush any further pending
783 responses before returning, except after I/O errors and timeouts. */
784
785 if (pending_MAIL)
786 {
787 count--;
788 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
789 {
790 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
791 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
792 if (errno == 0 && buffer[0] != 0)
793 {
794 uschar flushbuffer[4096];
795 int save_errno = 0;
796 if (buffer[0] == '4')
797 {
798 save_errno = ERRNO_MAIL4XX;
799 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
800 }
801 while (count-- > 0)
802 {
803 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
804 '2', timeout)
805 && (errno != 0 || flushbuffer[0] == 0))
806 break;
807 }
808 errno = save_errno;
809 }
810
811 if (pending_DATA) count--; /* Number of RCPT responses to come */
812 while (count-- > 0) /* Mark any pending addrs with the host used */
813 {
814 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
815 addr->host_used = host;
816 addr = addr->next;
817 }
818 return -3;
819 }
820 }
821
822 if (pending_DATA) count--; /* Number of RCPT responses to come */
823
824 /* Read and handle the required number of RCPT responses, matching each one up
825 with an address by scanning for the next address whose status is PENDING_DEFER.
826 */
827
828 while (count-- > 0)
829 {
830 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
831
832 /* The address was accepted */
833 addr->host_used = host;
834
835 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
836 {
837 yield |= 1;
838 addr->transport_return = PENDING_OK;
839
840 /* If af_dr_retry_exists is set, there was a routing delay on this address;
841 ensure that any address-specific retry record is expunged. We do this both
842 for the basic key and for the version that also includes the sender. */
843
844 if (testflag(addr, af_dr_retry_exists))
845 {
846 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
847 sender_address);
848 retry_add_item(addr, altkey, rf_delete);
849 retry_add_item(addr, addr->address_retry_key, rf_delete);
850 }
851 }
852
853 /* Timeout while reading the response */
854
855 else if (errno == ETIMEDOUT)
856 {
857 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
858 transport_rcpt_address(addr, include_affixes));
859 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
860 retry_add_item(addr, addr->address_retry_key, 0);
861 update_waiting = FALSE;
862 return -1;
863 }
864
865 /* Handle other errors in obtaining an SMTP response by returning -1. This
866 will cause all the addresses to be deferred. Restore the SMTP command in
867 big_buffer for which we are checking the response, so the error message
868 makes sense. */
869
870 else if (errno != 0 || buffer[0] == 0)
871 {
872 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
873 transport_rcpt_address(addr, include_affixes));
874 return -2;
875 }
876
877 /* Handle SMTP permanent and temporary response codes. */
878
879 else
880 {
881 addr->message =
882 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
883 "%s", transport_rcpt_address(addr, include_affixes),
884 string_printing(buffer));
885 setflag(addr, af_pass_message);
886 msglog_line(host, addr->message);
887
888 /* The response was 5xx */
889
890 if (buffer[0] == '5')
891 {
892 addr->transport_return = FAIL;
893 yield |= 2;
894 }
895
896 /* The response was 4xx */
897
898 else
899 {
900 addr->transport_return = DEFER;
901 addr->basic_errno = ERRNO_RCPT4XX;
902 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
903
904 #ifndef DISABLE_EVENT
905 event_defer_errno = addr->more_errno;
906 msg_event_raise(US"msg:rcpt:host:defer", addr);
907 #endif
908
909 /* Log temporary errors if there are more hosts to be tried.
910 If not, log this last one in the == line. */
911
912 if (host->next)
913 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
914
915 #ifndef DISABLE_EVENT
916 else
917 msg_event_raise(US"msg:rcpt:defer", addr);
918 #endif
919
920 /* Do not put this message on the list of those waiting for specific
921 hosts, as otherwise it is likely to be tried too often. */
922
923 update_waiting = FALSE;
924
925 /* Add a retry item for the address so that it doesn't get tried again
926 too soon. If address_retry_include_sender is true, add the sender address
927 to the retry key. */
928
929 if (address_retry_include_sender)
930 {
931 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
932 sender_address);
933 retry_add_item(addr, altkey, 0);
934 }
935 else retry_add_item(addr, addr->address_retry_key, 0);
936 }
937 }
938 } /* Loop for next RCPT response */
939
940 /* Update where to start at for the next block of responses, unless we
941 have already handled all the addresses. */
942
943 if (addr != NULL) *sync_addr = addr->next;
944
945 /* Handle a response to DATA. If we have not had any good recipients, either
946 previously or in this block, the response is ignored. */
947
948 if (pending_DATA != 0 &&
949 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
950 {
951 int code;
952 uschar *msg;
953 BOOL pass_message;
954 if (pending_DATA > 0 || (yield & 1) != 0)
955 {
956 if (errno == 0 && buffer[0] == '4')
957 {
958 errno = ERRNO_DATA4XX;
959 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
960 }
961 return -3;
962 }
963 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
964 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
965 "is in use and there were no good recipients\n", msg);
966 }
967
968 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
969 present) received 3xx. If any RCPTs were handled and yielded anything other
970 than 4xx, yield will be set non-zero. */
971
972 return yield;
973 }
974
975
976
977 /* Do the client side of smtp-level authentication */
978 /*
979 Arguments:
980 buffer EHLO response from server (gets overwritten)
981 addrlist chain of potential addresses to deliver
982 host host to deliver to
983 ob transport options
984 ibp, obp comms channel control blocks
985
986 Returns:
987 OK Success, or failed (but not required): global "smtp_authenticated" set
988 DEFER Failed authentication (and was required)
989 ERROR Internal problem
990
991 FAIL_SEND Failed communications - transmit
992 FAIL - response
993 */
994
995 int
996 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
997 smtp_transport_options_block *ob, BOOL is_esmtp,
998 smtp_inblock *ibp, smtp_outblock *obp)
999 {
1000 int require_auth;
1001 uschar *fail_reason = US"server did not advertise AUTH support";
1002
1003 smtp_authenticated = FALSE;
1004 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1005 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1006
1007 if (is_esmtp && !regex_AUTH) regex_AUTH =
1008 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1009 FALSE, TRUE);
1010
1011 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1012 {
1013 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1014 expand_nmax = -1; /* reset */
1015
1016 /* Must not do this check until after we have saved the result of the
1017 regex match above. */
1018
1019 if (require_auth == OK ||
1020 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1021 {
1022 auth_instance *au;
1023 fail_reason = US"no common mechanisms were found";
1024
1025 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1026
1027 /* Scan the configured authenticators looking for one which is configured
1028 for use as a client, which is not suppressed by client_condition, and
1029 whose name matches an authentication mechanism supported by the server.
1030 If one is found, attempt to authenticate by calling its client function.
1031 */
1032
1033 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1034 {
1035 uschar *p = names;
1036 if (!au->client ||
1037 (au->client_condition != NULL &&
1038 !expand_check_condition(au->client_condition, au->name,
1039 US"client authenticator")))
1040 {
1041 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1042 au->name,
1043 (au->client)? "client_condition is false" :
1044 "not configured as a client");
1045 continue;
1046 }
1047
1048 /* Loop to scan supported server mechanisms */
1049
1050 while (*p != 0)
1051 {
1052 int rc;
1053 int len = Ustrlen(au->public_name);
1054 while (isspace(*p)) p++;
1055
1056 if (strncmpic(au->public_name, p, len) != 0 ||
1057 (p[len] != 0 && !isspace(p[len])))
1058 {
1059 while (*p != 0 && !isspace(*p)) p++;
1060 continue;
1061 }
1062
1063 /* Found data for a listed mechanism. Call its client entry. Set
1064 a flag in the outblock so that data is overwritten after sending so
1065 that reflections don't show it. */
1066
1067 fail_reason = US"authentication attempt(s) failed";
1068 obp->authenticating = TRUE;
1069 rc = (au->info->clientcode)(au, ibp, obp,
1070 ob->command_timeout, buffer, bufsize);
1071 obp->authenticating = FALSE;
1072 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1073 au->name, rc);
1074
1075 /* A temporary authentication failure must hold up delivery to
1076 this host. After a permanent authentication failure, we carry on
1077 to try other authentication methods. If all fail hard, try to
1078 deliver the message unauthenticated unless require_auth was set. */
1079
1080 switch(rc)
1081 {
1082 case OK:
1083 smtp_authenticated = TRUE; /* stops the outer loop */
1084 client_authenticator = au->name;
1085 if (au->set_client_id != NULL)
1086 client_authenticated_id = expand_string(au->set_client_id);
1087 break;
1088
1089 /* Failure after writing a command */
1090
1091 case FAIL_SEND:
1092 return FAIL_SEND;
1093
1094 /* Failure after reading a response */
1095
1096 case FAIL:
1097 if (errno != 0 || buffer[0] != '5') return FAIL;
1098 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1099 au->name, host->name, host->address, buffer);
1100 break;
1101
1102 /* Failure by some other means. In effect, the authenticator
1103 decided it wasn't prepared to handle this case. Typically this
1104 is the result of "fail" in an expansion string. Do we need to
1105 log anything here? Feb 2006: a message is now put in the buffer
1106 if logging is required. */
1107
1108 case CANCELLED:
1109 if (*buffer != 0)
1110 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1111 "authentication H=%s [%s] %s", au->name, host->name,
1112 host->address, buffer);
1113 break;
1114
1115 /* Internal problem, message in buffer. */
1116
1117 case ERROR:
1118 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1119 DEFER, FALSE);
1120 return ERROR;
1121 }
1122
1123 break; /* If not authenticated, try next authenticator */
1124 } /* Loop for scanning supported server mechanisms */
1125 } /* Loop for further authenticators */
1126 }
1127 }
1128
1129 /* If we haven't authenticated, but are required to, give up. */
1130
1131 if (require_auth == OK && !smtp_authenticated)
1132 {
1133 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1134 string_sprintf("authentication required but %s", fail_reason), DEFER,
1135 FALSE);
1136 return DEFER;
1137 }
1138
1139 return OK;
1140 }
1141
1142
1143 /* Construct AUTH appendix string for MAIL TO */
1144 /*
1145 Arguments
1146 buffer to build string
1147 addrlist chain of potential addresses to deliver
1148 ob transport options
1149
1150 Globals smtp_authenticated
1151 client_authenticated_sender
1152 Return True on error, otherwise buffer has (possibly empty) terminated string
1153 */
1154
1155 BOOL
1156 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1157 smtp_transport_options_block *ob)
1158 {
1159 uschar *local_authenticated_sender = authenticated_sender;
1160
1161 #ifdef notdef
1162 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1163 #endif
1164
1165 if (ob->authenticated_sender != NULL)
1166 {
1167 uschar *new = expand_string(ob->authenticated_sender);
1168 if (new == NULL)
1169 {
1170 if (!expand_string_forcedfail)
1171 {
1172 uschar *message = string_sprintf("failed to expand "
1173 "authenticated_sender: %s", expand_string_message);
1174 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1175 return TRUE;
1176 }
1177 }
1178 else if (new[0] != 0) local_authenticated_sender = new;
1179 }
1180
1181 /* Add the authenticated sender address if present */
1182
1183 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1184 local_authenticated_sender != NULL)
1185 {
1186 string_format(buffer, bufsize, " AUTH=%s",
1187 auth_xtextencode(local_authenticated_sender,
1188 Ustrlen(local_authenticated_sender)));
1189 client_authenticated_sender = string_copy(local_authenticated_sender);
1190 }
1191 else
1192 *buffer= 0;
1193
1194 return FALSE;
1195 }
1196
1197
1198
1199 #ifdef EXPERIMENTAL_DANE
1200 /* Lookup TLSA record for host/port.
1201 Return: OK success with dnssec; DANE mode
1202 DEFER Do not use this host now, may retry later
1203 FAIL_FORCED No TLSA record; DANE not usable
1204 FAIL Do not use this connection
1205 */
1206
1207 int
1208 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1209 {
1210 /* move this out to host.c given the similarity to dns_lookup() ? */
1211 uschar buffer[300];
1212 const uschar * fullname = buffer;
1213
1214 /* TLSA lookup string */
1215 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1216
1217 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1218 {
1219 case DNS_SUCCEED:
1220 if (!dns_is_secure(dnsa))
1221 {
1222 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1223 return DEFER;
1224 }
1225 return OK;
1226
1227 case DNS_AGAIN:
1228 return DEFER; /* just defer this TLS'd conn */
1229
1230 case DNS_NODATA: /* no TLSA RR for this lookup */
1231 case DNS_NOMATCH: /* no records at all for this lookup */
1232 return dane_required ? FAIL : FAIL_FORCED;
1233
1234 default:
1235 case DNS_FAIL:
1236 return dane_required ? FAIL : DEFER;
1237 }
1238 }
1239 #endif
1240
1241
1242
1243 typedef struct smtp_compare_s
1244 {
1245 uschar *current_sender_address;
1246 struct transport_instance *tblock;
1247 } smtp_compare_t;
1248
1249 /*
1250 Create a unique string that identifies this message, it is based on
1251 sender_address, helo_data and tls_certificate if enabled. */
1252
1253 static uschar *
1254 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1255 {
1256 address_item * addr1;
1257 uschar * if1 = US"";
1258 uschar * helo1 = US"";
1259 #ifdef SUPPORT_TLS
1260 uschar * tlsc1 = US"";
1261 #endif
1262 uschar * save_sender_address = sender_address;
1263 uschar * local_identity = NULL;
1264 smtp_transport_options_block * ob =
1265 (smtp_transport_options_block *)tblock->options_block;
1266
1267 sender_address = sender;
1268
1269 addr1 = deliver_make_addr (sender, TRUE);
1270 deliver_set_expansions(addr1);
1271
1272 if (ob->interface)
1273 if1 = expand_string(ob->interface);
1274
1275 if (ob->helo_data)
1276 helo1 = expand_string(ob->helo_data);
1277
1278 #ifdef SUPPORT_TLS
1279 if (ob->tls_certificate)
1280 tlsc1 = expand_string(ob->tls_certificate);
1281 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1282 #else
1283 local_identity = string_sprintf ("%s^%s", if1, helo1);
1284 #endif
1285
1286 deliver_set_expansions(NULL);
1287 sender_address = save_sender_address;
1288
1289 return local_identity;
1290 }
1291
1292
1293
1294 /* This routine is a callback that is called from transport_check_waiting.
1295 This function will evaluate the incoming message versus the previous
1296 message. If the incoming message is using a different local identity then
1297 we will veto this new message. */
1298
1299 static BOOL
1300 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1301 {
1302 uschar * message_local_identity,
1303 * current_local_identity,
1304 * new_sender_address;
1305
1306 current_local_identity =
1307 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1308
1309 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1310 return 0;
1311
1312 message_local_identity =
1313 smtp_local_identity(new_sender_address, s_compare->tblock);
1314
1315 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1316 }
1317
1318
1319
1320 uschar
1321 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1322 {
1323 #ifdef SUPPORT_TLS
1324 if ( checks & PEER_OFFERED_TLS
1325 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_TLS;
1327 #endif
1328
1329 if ( checks & PEER_OFFERED_IGNQ
1330 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1331 PCRE_EOPT, NULL, 0) < 0)
1332 checks &= ~PEER_OFFERED_IGNQ;
1333
1334 if ( checks & PEER_OFFERED_CHUNKING
1335 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_CHUNKING;
1337
1338 #ifndef DISABLE_PRDR
1339 if ( checks & PEER_OFFERED_PRDR
1340 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1341 checks &= ~PEER_OFFERED_PRDR;
1342 #endif
1343
1344 #ifdef SUPPORT_I18N
1345 if ( checks & PEER_OFFERED_UTF8
1346 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_UTF8;
1348 #endif
1349
1350 if ( checks & PEER_OFFERED_DSN
1351 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~PEER_OFFERED_DSN;
1353
1354 if ( checks & PEER_OFFERED_PIPE
1355 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1356 PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~PEER_OFFERED_PIPE;
1358
1359 if ( checks & PEER_OFFERED_SIZE
1360 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1361 checks &= ~PEER_OFFERED_SIZE;
1362
1363 return checks;
1364 }
1365
1366
1367
1368 /* Callback for emitting a BDAT data chunk header.
1369
1370 If given a nonzero size, first flush any buffered SMTP commands
1371 then emit the command.
1372
1373 Reap previous SMTP command responses if requested.
1374 Reap one SMTP command response if requested.
1375
1376 Returns: OK or ERROR
1377 */
1378
1379 static int
1380 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1381 unsigned chunk_size, unsigned flags)
1382 {
1383 smtp_transport_options_block * ob =
1384 (smtp_transport_options_block *)(tctx->tblock->options_block);
1385 int cmd_count = 0;
1386 int prev_cmd_count;
1387 uschar * buffer = tctx->buffer;
1388
1389
1390 /* Write SMTP chunk header command */
1391
1392 if (chunk_size > 0)
1393 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1394 chunk_size,
1395 flags & tc_chunk_last ? " LAST" : "")
1396 ) < 0) return ERROR;
1397
1398 prev_cmd_count = cmd_count += tctx->cmd_count;
1399
1400 /* Reap responses for any previous, but not one we just emitted */
1401
1402 if (chunk_size > 0)
1403 prev_cmd_count--;
1404 if (tctx->pending_BDAT)
1405 prev_cmd_count--;
1406
1407 if (flags & tc_reap_prev && prev_cmd_count > 0)
1408 {
1409 DEBUG(D_transport) debug_printf("look for %d responses"
1410 " for previous pipelined cmds\n", prev_cmd_count);
1411
1412 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1413 tctx->sync_addr, tctx->host, prev_cmd_count,
1414 ob->address_retry_include_sender,
1415 tctx->pending_MAIL, 0,
1416 tctx->inblock,
1417 ob->command_timeout,
1418 buffer, DELIVER_BUFFER_SIZE))
1419 {
1420 case 1: /* 2xx (only) => OK */
1421 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1424
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1427 }
1428 cmd_count = 1;
1429 if (!tctx->pending_BDAT)
1430 pipelining_active = FALSE;
1431 }
1432
1433 /* Reap response for an outstanding BDAT */
1434
1435 if (tctx->pending_BDAT)
1436 {
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1438
1439 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1440 ob->command_timeout))
1441 {
1442 if (errno == 0 && buffer[0] == '4')
1443 {
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1445 tctx->first_addr->more_errno |=
1446 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1447 }
1448 return ERROR;
1449 }
1450 cmd_count--;
1451 tctx->pending_BDAT = FALSE;
1452 pipelining_active = FALSE;
1453 }
1454 else if (chunk_size > 0)
1455 tctx->pending_BDAT = TRUE;
1456
1457
1458 tctx->cmd_count = cmd_count;
1459 return OK;
1460 }
1461
1462
1463
1464 /*************************************************
1465 * Deliver address list to given host *
1466 *************************************************/
1467
1468 /* If continue_hostname is not null, we get here only when continuing to
1469 deliver down an existing channel. The channel was passed as the standard
1470 input. TLS is never active on a passed channel; the previous process always
1471 closes it down before passing the connection on.
1472
1473 Otherwise, we have to make a connection to the remote host, and do the
1474 initial protocol exchange.
1475
1476 When running as an MUA wrapper, if the sender or any recipient is rejected,
1477 temporarily or permanently, we force failure for all recipients.
1478
1479 Arguments:
1480 addrlist chain of potential addresses to deliver; only those whose
1481 transport_return field is set to PENDING_DEFER are currently
1482 being processed; others should be skipped - they have either
1483 been delivered to an earlier host or IP address, or been
1484 failed by one of them.
1485 host host to deliver to
1486 host_af AF_INET or AF_INET6
1487 port default TCP/IP port to use, in host byte order
1488 interface interface to bind to, or NULL
1489 tblock transport instance block
1490 message_defer set TRUE if yield is OK, but all addresses were deferred
1491 because of a non-recipient, non-host failure, that is, a
1492 4xx response to MAIL FROM, DATA, or ".". This is a defer
1493 that is specific to the message.
1494 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1495 a second attempt after TLS initialization fails
1496
1497 Returns: OK - the connection was made and the delivery attempted;
1498 the result for each address is in its data block.
1499 DEFER - the connection could not be made, or something failed
1500 while setting up the SMTP session, or there was a
1501 non-message-specific error, such as a timeout.
1502 ERROR - a filter command is specified for this transport,
1503 and there was a problem setting it up; OR helo_data
1504 or add_headers or authenticated_sender is specified
1505 for this transport, and the string failed to expand
1506 */
1507
1508 static int
1509 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1510 uschar *interface, transport_instance *tblock,
1511 BOOL *message_defer, BOOL suppress_tls)
1512 {
1513 address_item *addr;
1514 address_item *sync_addr;
1515 address_item *first_addr = addrlist;
1516 int yield = OK;
1517 int address_count;
1518 int save_errno;
1519 int rc;
1520 time_t start_delivery_time = time(NULL);
1521 smtp_transport_options_block *ob =
1522 (smtp_transport_options_block *)(tblock->options_block);
1523 struct lflags {
1524 BOOL lmtp:1;
1525 BOOL smtps:1;
1526 BOOL ok:1;
1527 BOOL send_rset:1;
1528 BOOL send_quit:1;
1529 BOOL setting_up:1;
1530 BOOL esmtp:1;
1531 BOOL esmtp_sent:1;
1532 BOOL pending_MAIL:1;
1533 #ifndef DISABLE_PRDR
1534 BOOL prdr_active:1;
1535 #endif
1536 #ifdef SUPPORT_I18N
1537 BOOL utf8_needed:1;
1538 #endif
1539 BOOL dsn_all_lasthop:1;
1540 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1541 BOOL dane:1;
1542 BOOL dane_required:1;
1543 #endif
1544 } lflags;
1545
1546 BOOL pass_message = FALSE;
1547 BOOL completed_address = FALSE;
1548 uschar peer_offered = 0;
1549 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1550 dns_answer tlsa_dnsa;
1551 #endif
1552 smtp_inblock inblock;
1553 smtp_outblock outblock;
1554 int max_rcpt = tblock->max_addresses;
1555 uschar *igquotstr = US"";
1556
1557 #ifdef EXPERIMENTAL_DSN_INFO
1558 uschar *smtp_greeting = NULL;
1559 uschar *helo_response = NULL;
1560 #endif
1561 uschar *helo_data = NULL;
1562
1563 uschar *message = NULL;
1564 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1565 uschar *p;
1566 uschar buffer[DELIVER_BUFFER_SIZE];
1567 uschar inbuffer[4096];
1568 uschar outbuffer[4096];
1569
1570 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1571
1572 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1573 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1574 lflags.ok = FALSE;
1575 lflags.send_rset = TRUE;
1576 lflags.send_quit = TRUE;
1577 lflags.setting_up = TRUE;
1578 lflags.esmtp = TRUE;
1579 lflags.esmtp_sent = FALSE;
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 buffer[0] = '\0';
1592 if (max_rcpt == 0) max_rcpt = 999999;
1593
1594 /* Set up the buffer for reading SMTP response packets. */
1595
1596 inblock.buffer = inbuffer;
1597 inblock.buffersize = sizeof(inbuffer);
1598 inblock.ptr = inbuffer;
1599 inblock.ptrend = inbuffer;
1600
1601 /* Set up the buffer for holding SMTP commands while pipelining */
1602
1603 outblock.buffer = outbuffer;
1604 outblock.buffersize = sizeof(outbuffer);
1605 outblock.ptr = outbuffer;
1606 outblock.cmd_count = 0;
1607 outblock.authenticating = FALSE;
1608
1609 /* Reset the parameters of a TLS session. */
1610
1611 tls_out.bits = 0;
1612 tls_out.cipher = NULL; /* the one we may use for this transport */
1613 tls_out.ourcert = NULL;
1614 tls_out.peercert = NULL;
1615 tls_out.peerdn = NULL;
1616 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1617 tls_out.sni = NULL;
1618 #endif
1619 tls_out.ocsp = OCSP_NOT_REQ;
1620
1621 /* Flip the legacy TLS-related variables over to the outbound set in case
1622 they're used in the context of the transport. Don't bother resetting
1623 afterward as we're in a subprocess. */
1624
1625 tls_modify_variables(&tls_out);
1626
1627 #ifndef SUPPORT_TLS
1628 if (lflags.smtps)
1629 {
1630 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1631 DEFER, FALSE);
1632 return ERROR;
1633 }
1634 #endif
1635
1636 /* Make a connection to the host if this isn't a continued delivery, and handle
1637 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1638 specially so they can be identified for retries. */
1639
1640 if (continue_hostname == NULL)
1641 {
1642 /* This puts port into host->port */
1643 inblock.sock = outblock.sock =
1644 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1645
1646 if (inblock.sock < 0)
1647 {
1648 set_errno_nohost(addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1649 NULL, DEFER, FALSE);
1650 return DEFER;
1651 }
1652
1653 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1654 {
1655 tls_out.dane_verified = FALSE;
1656 tls_out.tlsa_usage = 0;
1657
1658 if (host->dnssec == DS_YES)
1659 {
1660 if( lflags.dane_required
1661 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1662 )
1663 switch (rc = tlsa_lookup(host, &tlsa_dnsa, lflags.dane_required))
1664 {
1665 case OK: lflags.dane = TRUE; break;
1666 case FAIL_FORCED: break;
1667 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1668 string_sprintf("DANE error: tlsa lookup %s",
1669 rc == DEFER ? "DEFER" : "FAIL"),
1670 rc, FALSE);
1671 return rc;
1672 }
1673 }
1674 else if (lflags.dane_required)
1675 {
1676 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1677 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1678 FAIL, FALSE);
1679 return FAIL;
1680 }
1681
1682 if (lflags.dane)
1683 ob->tls_tempfail_tryclear = FALSE;
1684 }
1685 #endif /*DANE*/
1686
1687 /* Expand the greeting message while waiting for the initial response. (Makes
1688 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1689 delayed till here so that $sending_interface and $sending_port are set. */
1690
1691 helo_data = expand_string(ob->helo_data);
1692 #ifdef SUPPORT_I18N
1693 if (helo_data)
1694 {
1695 uschar * errstr = NULL;
1696 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1697 {
1698 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1699 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1700 yield = DEFER;
1701 goto SEND_QUIT;
1702 }
1703 }
1704 #endif
1705
1706 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1707 is nevertheless a reasonably clean way of programming this kind of logic,
1708 where you want to escape on any error. */
1709
1710 if (!lflags.smtps)
1711 {
1712 BOOL good_response;
1713
1714 #ifdef TCP_QUICKACK
1715 (void) setsockopt(inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1716 #endif
1717 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1718 '2', ob->command_timeout);
1719 #ifdef EXPERIMENTAL_DSN_INFO
1720 smtp_greeting = string_copy(buffer);
1721 #endif
1722 if (!good_response) goto RESPONSE_FAILED;
1723
1724 #ifndef DISABLE_EVENT
1725 {
1726 uschar * s;
1727 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1728 : host->dnssec==DS_NO ? US"no" : NULL;
1729 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1730 if (s)
1731 {
1732 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1733 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1734 DEFER, FALSE);
1735 yield = DEFER;
1736 goto SEND_QUIT;
1737 }
1738 }
1739 #endif
1740
1741 /* Now check if the helo_data expansion went well, and sign off cleanly if
1742 it didn't. */
1743
1744 if (!helo_data)
1745 {
1746 uschar *message = string_sprintf("failed to expand helo_data: %s",
1747 expand_string_message);
1748 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1749 yield = DEFER;
1750 goto SEND_QUIT;
1751 }
1752 }
1753
1754 /** Debugging without sending a message
1755 addrlist->transport_return = DEFER;
1756 goto SEND_QUIT;
1757 **/
1758
1759 /* Errors that occur after this point follow an SMTP command, which is
1760 left in big_buffer by smtp_write_command() for use in error messages. */
1761
1762 smtp_command = big_buffer;
1763
1764 /* Tell the remote who we are...
1765
1766 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1767 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1768 greeting is of this form. The assumption was that the far end supports it
1769 properly... but experience shows that there are some that give 5xx responses,
1770 even though the banner includes "ESMTP" (there's a bloody-minded one that
1771 says "ESMTP not spoken here"). Cope with that case.
1772
1773 September 2000: Time has passed, and it seems reasonable now to always send
1774 EHLO at the start. It is also convenient to make the change while installing
1775 the TLS stuff.
1776
1777 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1778 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1779 would be no way to send out the mails, so there is now a host list
1780 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1781 PIPELINING problem as well. Maybe it can also be useful to cure other
1782 problems with broken servers.
1783
1784 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1785 Then somebody tried it with a Microsoft mailer... It seems that all other
1786 mailers use upper case for some reason (the RFC is quite clear about case
1787 independence) so, for peace of mind, I gave in. */
1788
1789 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1790
1791 /* Alas; be careful, since this goto is not an error-out, so conceivably
1792 we might set data between here and the target which we assume to exist
1793 and be usable. I can see this coming back to bite us. */
1794 #ifdef SUPPORT_TLS
1795 if (lflags.smtps)
1796 {
1797 smtp_peer_options |= PEER_OFFERED_TLS;
1798 suppress_tls = FALSE;
1799 ob->tls_tempfail_tryclear = FALSE;
1800 smtp_command = US"SSL-on-connect";
1801 goto TLS_NEGOTIATE;
1802 }
1803 #endif
1804
1805 if (lflags.esmtp)
1806 {
1807 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1808 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1809 goto SEND_FAILED;
1810 lflags.esmtp_sent = TRUE;
1811 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1812 ob->command_timeout))
1813 {
1814 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1815 {
1816 #ifdef EXPERIMENTAL_DSN_INFO
1817 helo_response = string_copy(buffer);
1818 #endif
1819 goto RESPONSE_FAILED;
1820 }
1821 lflags.esmtp = FALSE;
1822 }
1823 #ifdef EXPERIMENTAL_DSN_INFO
1824 helo_response = string_copy(buffer);
1825 #endif
1826 }
1827 else
1828 DEBUG(D_transport)
1829 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1830
1831 if (!lflags.esmtp)
1832 {
1833 BOOL good_response;
1834 int n = sizeof(buffer);
1835 uschar * rsp = buffer;
1836
1837 if (lflags.esmtp_sent && (n = Ustrlen(buffer)) < sizeof(buffer)/2)
1838 { rsp = buffer + n + 1; n = sizeof(buffer) - n; }
1839
1840 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1841 goto SEND_FAILED;
1842 good_response = smtp_read_response(&inblock, rsp, n,
1843 '2', ob->command_timeout);
1844 #ifdef EXPERIMENTAL_DSN_INFO
1845 helo_response = string_copy(rsp);
1846 #endif
1847 if (!good_response)
1848 {
1849 /* Handle special logging for a closed connection after HELO
1850 when had previously sent EHLO */
1851
1852 if (rsp != buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1853 {
1854 message = NULL;
1855 lflags.send_quit = FALSE;
1856 save_errno = ERRNO_SMTPCLOSED;
1857 message = string_sprintf("Remote host closed connection "
1858 "in response to %s (EHLO response was: %s)",
1859 smtp_command, buffer);
1860 goto FAILED;
1861 }
1862 Ustrncpy(buffer, rsp, sizeof(buffer)/2);
1863 goto RESPONSE_FAILED;
1864 }
1865 }
1866
1867 peer_offered = smtp_peer_options = 0;
1868
1869 if (lflags.esmtp || lflags.lmtp)
1870 {
1871 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1872 PEER_OFFERED_TLS /* others checked later */
1873 );
1874
1875 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1876
1877 #ifdef SUPPORT_TLS
1878 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1879 #endif
1880 }
1881 }
1882
1883 /* For continuing deliveries down the same channel, the socket is the standard
1884 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1885 below). Set up the pointer to where subsequent commands will be left, for
1886 error messages. Note that smtp_peer_options will have been
1887 set from the command line if they were set in the process that passed the
1888 connection on. */
1889
1890 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1891 as the contine goes via transport_pass_socket() and doublefork and exec.
1892 It does not wait. Unclear how we keep separate host's responses
1893 separate - we could match up by host ip+port as a bodge. */
1894
1895 else
1896 {
1897 inblock.sock = outblock.sock = fileno(stdin);
1898 smtp_command = big_buffer;
1899 host->port = port; /* Record the port that was used */
1900 }
1901
1902 /* If TLS is available on this connection, whether continued or not, attempt to
1903 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1904 send another EHLO - the server may give a different answer in secure mode. We
1905 use a separate buffer for reading the response to STARTTLS so that if it is
1906 negative, the original EHLO data is available for subsequent analysis, should
1907 the client not be required to use TLS. If the response is bad, copy the buffer
1908 for error analysis. */
1909
1910 #ifdef SUPPORT_TLS
1911 if ( smtp_peer_options & PEER_OFFERED_TLS
1912 && !suppress_tls
1913 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1914 {
1915 uschar buffer2[4096];
1916 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1917 goto SEND_FAILED;
1918
1919 /* If there is an I/O error, transmission of this message is deferred. If
1920 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1921 false, we also defer. However, if there is a temporary rejection of STARTTLS
1922 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1923 STARTTLS, we carry on. This means we will try to send the message in clear,
1924 unless the host is in hosts_require_tls (tested below). */
1925
1926 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1927 ob->command_timeout))
1928 {
1929 if ( errno != 0
1930 || buffer2[0] == 0
1931 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1932 )
1933 {
1934 Ustrncpy(buffer, buffer2, sizeof(buffer));
1935 goto RESPONSE_FAILED;
1936 }
1937 }
1938
1939 /* STARTTLS accepted: try to negotiate a TLS session. */
1940
1941 else
1942 TLS_NEGOTIATE:
1943 {
1944 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1945 # ifdef EXPERIMENTAL_DANE
1946 , lflags.dane ? &tlsa_dnsa : NULL
1947 # endif
1948 );
1949
1950 /* TLS negotiation failed; give an error. From outside, this function may
1951 be called again to try in clear on a new connection, if the options permit
1952 it for this host. */
1953
1954 if (rc != OK)
1955 {
1956 # ifdef EXPERIMENTAL_DANE
1957 if (lflags.dane) log_write(0, LOG_MAIN,
1958 "DANE attempt failed; no TLS connection to %s [%s]",
1959 host->name, host->address);
1960 # endif
1961
1962 save_errno = ERRNO_TLSFAILURE;
1963 message = US"failure while setting up TLS session";
1964 lflags.send_quit = FALSE;
1965 goto TLS_FAILED;
1966 }
1967
1968 /* TLS session is set up */
1969
1970 smtp_peer_options_wrap = smtp_peer_options;
1971 for (addr = addrlist; addr; addr = addr->next)
1972 if (addr->transport_return == PENDING_DEFER)
1973 {
1974 addr->cipher = tls_out.cipher;
1975 addr->ourcert = tls_out.ourcert;
1976 addr->peercert = tls_out.peercert;
1977 addr->peerdn = tls_out.peerdn;
1978 addr->ocsp = tls_out.ocsp;
1979 }
1980 }
1981 }
1982
1983 /* if smtps, we'll have smtp_command set to something else; always safe to
1984 reset it here. */
1985 smtp_command = big_buffer;
1986
1987 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1988 helo_data is null, we are dealing with a connection that was passed from
1989 another process, and so we won't have expanded helo_data above. We have to
1990 expand it here. $sending_ip_address and $sending_port are set up right at the
1991 start of the Exim process (in exim.c). */
1992
1993 if (tls_out.active >= 0)
1994 {
1995 char *greeting_cmd;
1996 BOOL good_response;
1997
1998 if (helo_data == NULL)
1999 {
2000 helo_data = expand_string(ob->helo_data);
2001 if (helo_data == NULL)
2002 {
2003 uschar *message = string_sprintf("failed to expand helo_data: %s",
2004 expand_string_message);
2005 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2006 yield = DEFER;
2007 goto SEND_QUIT;
2008 }
2009 }
2010
2011 /* For SMTPS we need to wait for the initial OK response. */
2012 if (lflags.smtps)
2013 {
2014 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2015 '2', ob->command_timeout);
2016 #ifdef EXPERIMENTAL_DSN_INFO
2017 smtp_greeting = string_copy(buffer);
2018 #endif
2019 if (!good_response) goto RESPONSE_FAILED;
2020 }
2021
2022 if (lflags.esmtp)
2023 greeting_cmd = "EHLO";
2024 else
2025 {
2026 greeting_cmd = "HELO";
2027 DEBUG(D_transport)
2028 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2029 }
2030
2031 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
2032 lflags.lmtp ? "LHLO" : greeting_cmd, helo_data) < 0)
2033 goto SEND_FAILED;
2034 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2035 '2', ob->command_timeout);
2036 #ifdef EXPERIMENTAL_DSN_INFO
2037 helo_response = string_copy(buffer);
2038 #endif
2039 if (!good_response) goto RESPONSE_FAILED;
2040 smtp_peer_options = 0;
2041 }
2042
2043 /* If the host is required to use a secure channel, ensure that we
2044 have one. */
2045
2046 else if ( lflags.smtps
2047 # ifdef EXPERIMENTAL_DANE
2048 || lflags.dane
2049 # endif
2050 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
2051 )
2052 {
2053 save_errno = ERRNO_TLSREQUIRED;
2054 message = string_sprintf("a TLS session is required, but %s",
2055 smtp_peer_options & PEER_OFFERED_TLS
2056 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2057 goto TLS_FAILED;
2058 }
2059 #endif /*SUPPORT_TLS*/
2060
2061 /* If TLS is active, we have just started it up and re-done the EHLO command,
2062 so its response needs to be analyzed. If TLS is not active and this is a
2063 continued session down a previously-used socket, we haven't just done EHLO, so
2064 we skip this. */
2065
2066 if (continue_hostname == NULL
2067 #ifdef SUPPORT_TLS
2068 || tls_out.active >= 0
2069 #endif
2070 )
2071 {
2072 if (lflags.esmtp || lflags.lmtp)
2073 {
2074 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2075 0 /* no TLS */
2076 | (lflags.lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2077 | PEER_OFFERED_CHUNKING
2078 | PEER_OFFERED_PRDR
2079 #ifdef SUPPORT_I18N
2080 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2081 /*XXX if we hand peercaps on to continued-conn processes,
2082 must not depend on this addr */
2083 #endif
2084 | PEER_OFFERED_DSN
2085 | PEER_OFFERED_PIPE
2086 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2087 );
2088
2089 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2090 lmtp_ignore_quota option was set. */
2091
2092 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2093
2094 /* If the response to EHLO specified support for the SIZE parameter, note
2095 this, provided size_addition is non-negative. */
2096
2097 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2098
2099 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2100 the current host, esmtp will be false, so PIPELINING can never be used. If
2101 the current host matches hosts_avoid_pipelining, don't do it. */
2102
2103 if ( peer_offered & PEER_OFFERED_PIPE
2104 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2105 smtp_peer_options |= PEER_OFFERED_PIPE;
2106
2107 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2108 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2109
2110 if ( peer_offered & PEER_OFFERED_CHUNKING
2111 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2112 peer_offered &= ~PEER_OFFERED_CHUNKING;
2113
2114 if (peer_offered & PEER_OFFERED_CHUNKING)
2115 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2116
2117 #ifndef DISABLE_PRDR
2118 if ( peer_offered & PEER_OFFERED_PRDR
2119 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2120 peer_offered &= ~PEER_OFFERED_PRDR;
2121
2122 if (peer_offered & PEER_OFFERED_PRDR)
2123 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2124 #endif
2125
2126 /* Note if the server supports DSN */
2127 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2128 DEBUG(D_transport) debug_printf("%susing DSN\n",
2129 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2130
2131 /* Note if the response to EHLO specifies support for the AUTH extension.
2132 If it has, check that this host is one we want to authenticate to, and do
2133 the business. The host name and address must be available when the
2134 authenticator's client driver is running. */
2135
2136 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2137 ob, lflags.esmtp, &inblock, &outblock))
2138 {
2139 default: goto SEND_QUIT;
2140 case OK: break;
2141 case FAIL_SEND: goto SEND_FAILED;
2142 case FAIL: goto RESPONSE_FAILED;
2143 }
2144 }
2145 }
2146 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2147
2148 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2149 message-specific. */
2150
2151 lflags.setting_up = FALSE;
2152
2153 #ifdef SUPPORT_I18N
2154 if (addrlist->prop.utf8_msg)
2155 {
2156 lflags.utf8_needed = !addrlist->prop.utf8_downcvt
2157 && !addrlist->prop.utf8_downcvt_maybe;
2158 DEBUG(D_transport) if (!lflags.utf8_needed)
2159 debug_printf("utf8: %s downconvert\n",
2160 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2161 }
2162
2163 /* If this is an international message we need the host to speak SMTPUTF8 */
2164 if (lflags.utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2165 {
2166 errno = ERRNO_UTF8_FWD;
2167 goto RESPONSE_FAILED;
2168 }
2169 #endif
2170
2171 /* If there is a filter command specified for this transport, we can now
2172 set it up. This cannot be done until the identify of the host is known. */
2173
2174 if (tblock->filter_command != NULL)
2175 {
2176 BOOL rc;
2177 uschar fbuf[64];
2178 sprintf(CS fbuf, "%.50s transport", tblock->name);
2179 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2180 TRUE, DEFER, addrlist, fbuf, NULL);
2181 transport_filter_timeout = tblock->filter_timeout;
2182
2183 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2184 yield ERROR. */
2185
2186 if (!rc)
2187 {
2188 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2189 FALSE);
2190 yield = ERROR;
2191 goto SEND_QUIT;
2192 }
2193
2194 if ( transport_filter_argv
2195 && *transport_filter_argv
2196 && **transport_filter_argv
2197 && peer_offered & PEER_OFFERED_CHUNKING
2198 )
2199 {
2200 peer_offered &= ~PEER_OFFERED_CHUNKING;
2201 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2202 }
2203 }
2204
2205
2206 /* For messages that have more than the maximum number of envelope recipients,
2207 we want to send several transactions down the same SMTP connection. (See
2208 comments in deliver.c as to how this reconciles, heuristically, with
2209 remote_max_parallel.) This optimization was added to Exim after the following
2210 code was already working. The simplest way to put it in without disturbing the
2211 code was to use a goto to jump back to this point when there is another
2212 transaction to handle. */
2213
2214 SEND_MESSAGE:
2215 sync_addr = first_addr;
2216 address_count = 0;
2217 lflags.ok = FALSE;
2218 lflags.send_rset = TRUE;
2219 completed_address = FALSE;
2220
2221
2222 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2223 qualification, send it, adding something to the message size to allow for
2224 imprecision and things that get added en route. Exim keeps the number of lines
2225 in a message, so we can give an accurate value for the original message, but we
2226 need some additional to handle added headers. (Double "." characters don't get
2227 included in the count.) */
2228
2229 p = buffer;
2230 *p = 0;
2231
2232 if (peer_offered & PEER_OFFERED_SIZE)
2233 {
2234 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2235 while (*p) p++;
2236 }
2237
2238 #ifndef DISABLE_PRDR
2239 lflags.prdr_active = FALSE;
2240 if (peer_offered & PEER_OFFERED_PRDR)
2241 for (addr = first_addr; addr; addr = addr->next)
2242 if (addr->transport_return == PENDING_DEFER)
2243 {
2244 for (addr = addr->next; addr; addr = addr->next)
2245 if (addr->transport_return == PENDING_DEFER)
2246 { /* at least two recipients to send */
2247 lflags.prdr_active = TRUE;
2248 sprintf(CS p, " PRDR"); p += 5;
2249 break;
2250 }
2251 break;
2252 }
2253 #endif
2254
2255 #ifdef SUPPORT_I18N
2256 if ( addrlist->prop.utf8_msg
2257 && !addrlist->prop.utf8_downcvt
2258 && peer_offered & PEER_OFFERED_UTF8
2259 )
2260 sprintf(CS p, " SMTPUTF8"), p += 9;
2261 #endif
2262
2263 /* check if all addresses have lasthop flag */
2264 /* do not send RET and ENVID if true */
2265 for (lflags.dsn_all_lasthop = TRUE, addr = first_addr;
2266 address_count < max_rcpt && addr != NULL;
2267 addr = addr->next)
2268 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2269 {
2270 lflags.dsn_all_lasthop = FALSE;
2271 break;
2272 }
2273
2274 /* Add any DSN flags to the mail command */
2275
2276 if (peer_offered & PEER_OFFERED_DSN && !lflags.dsn_all_lasthop)
2277 {
2278 if (dsn_ret == dsn_ret_hdrs)
2279 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2280 else if (dsn_ret == dsn_ret_full)
2281 { Ustrcpy(p, " RET=FULL"); p += 9; }
2282
2283 if (dsn_envid)
2284 {
2285 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2286 while (*p) p++;
2287 }
2288 }
2289
2290 /* If an authenticated_sender override has been specified for this transport
2291 instance, expand it. If the expansion is forced to fail, and there was already
2292 an authenticated_sender for this message, the original value will be used.
2293 Other expansion failures are serious. An empty result is ignored, but there is
2294 otherwise no check - this feature is expected to be used with LMTP and other
2295 cases where non-standard addresses (e.g. without domains) might be required. */
2296
2297 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2298 {
2299 yield = ERROR;
2300 goto SEND_QUIT;
2301 }
2302
2303 /* From here until we send the DATA command, we can make use of PIPELINING
2304 if the server host supports it. The code has to be able to check the responses
2305 at any point, for when the buffer fills up, so we write it totally generally.
2306 When PIPELINING is off, each command written reports that it has flushed the
2307 buffer. */
2308
2309 lflags.pending_MAIL = TRUE; /* The block starts with MAIL */
2310
2311 {
2312 uschar * s = return_path;
2313 #ifdef SUPPORT_I18N
2314 uschar * errstr = NULL;
2315
2316 /* If we must downconvert, do the from-address here. Remember we had to
2317 for the to-addresses (done below), and also (ugly) for re-doing when building
2318 the delivery log line. */
2319
2320 if ( addrlist->prop.utf8_msg
2321 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2322 )
2323 {
2324 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2325 {
2326 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2327 yield = ERROR;
2328 goto SEND_QUIT;
2329 }
2330 setflag(addrlist, af_utf8_downcvt);
2331 }
2332 #endif
2333
2334 rc = smtp_write_command(&outblock, pipelining_active,
2335 "MAIL FROM:<%s>%s\r\n", s, buffer);
2336 }
2337
2338 mail_command = string_copy(big_buffer); /* Save for later error message */
2339
2340 switch(rc)
2341 {
2342 case -1: /* Transmission error */
2343 goto SEND_FAILED;
2344
2345 case +1: /* Block was sent */
2346 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2347 ob->command_timeout))
2348 {
2349 if (errno == 0 && buffer[0] == '4')
2350 {
2351 errno = ERRNO_MAIL4XX;
2352 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2353 }
2354 goto RESPONSE_FAILED;
2355 }
2356 lflags.pending_MAIL = FALSE;
2357 break;
2358 }
2359
2360 /* Pass over all the relevant recipient addresses for this host, which are the
2361 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2362 several before we have to read the responses for those seen so far. This
2363 checking is done by a subroutine because it also needs to be done at the end.
2364 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2365 the next one if not all are sent.
2366
2367 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2368 last address because we want to abort if any recipients have any kind of
2369 problem, temporary or permanent. We know that all recipient addresses will have
2370 the PENDING_DEFER status, because only one attempt is ever made, and we know
2371 that max_rcpt will be large, so all addresses will be done at once. */
2372
2373 for (addr = first_addr;
2374 addr && address_count < max_rcpt;
2375 addr = addr->next)
2376 if (addr->transport_return == PENDING_DEFER)
2377 {
2378 int count;
2379 BOOL no_flush;
2380 uschar * rcpt_addr;
2381
2382 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2383 ? dsn_support_yes : dsn_support_no;
2384
2385 address_count++;
2386 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2387
2388 /* Add any DSN flags to the rcpt command and add to the sent string */
2389
2390 p = buffer;
2391 *p = 0;
2392
2393 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2394 {
2395 if (addr->dsn_flags & rf_dsnflags)
2396 {
2397 int i;
2398 BOOL first = TRUE;
2399 Ustrcpy(p, " NOTIFY=");
2400 while (*p) p++;
2401 for (i = 0; i < 4; i++)
2402 if ((addr->dsn_flags & rf_list[i]) != 0)
2403 {
2404 if (!first) *p++ = ',';
2405 first = FALSE;
2406 Ustrcpy(p, rf_names[i]);
2407 while (*p) p++;
2408 }
2409 }
2410
2411 if (addr->dsn_orcpt)
2412 {
2413 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2414 addr->dsn_orcpt);
2415 while (*p) p++;
2416 }
2417 }
2418
2419 /* Now send the RCPT command, and process outstanding responses when
2420 necessary. After a timeout on RCPT, we just end the function, leaving the
2421 yield as OK, because this error can often mean that there is a problem with
2422 just one address, so we don't want to delay the host. */
2423
2424 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2425
2426 #ifdef SUPPORT_I18N
2427 if ( testflag(addrlist, af_utf8_downcvt)
2428 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2429 )
2430 {
2431 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2432 errno = ERRNO_EXPANDFAIL;
2433 goto SEND_FAILED;
2434 }
2435 #endif
2436
2437 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2438 rcpt_addr, igquotstr, buffer);
2439
2440 if (count < 0) goto SEND_FAILED;
2441 if (count > 0)
2442 {
2443 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2444 &sync_addr, host, count, ob->address_retry_include_sender,
2445 lflags.pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2446 sizeof(buffer)))
2447 {
2448 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2449 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2450 break;
2451
2452 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2453 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2454 case 0: /* No 2xx or 5xx, but no probs */
2455 break;
2456
2457 case -1: goto END_OFF; /* Timeout on RCPT */
2458 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2459 }
2460 lflags.pending_MAIL = FALSE; /* Dealt with MAIL */
2461 }
2462 } /* Loop for next address */
2463
2464 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2465 permanently or temporarily. We should have flushed and synced after the last
2466 RCPT. */
2467
2468 if (mua_wrapper)
2469 {
2470 address_item *badaddr;
2471 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2472 if (badaddr->transport_return != PENDING_OK)
2473 {
2474 /*XXX could we find a better errno than 0 here? */
2475 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2476 testflag(badaddr, af_pass_message));
2477 lflags.ok = FALSE;
2478 break;
2479 }
2480 }
2481
2482 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2483 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2484 have a good recipient buffered up if we are pipelining. We don't want to waste
2485 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2486 are pipelining. The responses are all handled by sync_responses().
2487 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2488 to send is. */
2489
2490 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2491 && (lflags.ok || (pipelining_active && !mua_wrapper)))
2492 {
2493 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2494
2495 if (count < 0) goto SEND_FAILED;
2496 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2497 host, count, ob->address_retry_include_sender, lflags.pending_MAIL,
2498 lflags.ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2499 {
2500 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2501 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2502 break;
2503
2504 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2505 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2506 case 0: break; /* No 2xx or 5xx, but no probs */
2507
2508 case -1: goto END_OFF; /* Timeout on RCPT */
2509 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2510 }
2511 pipelining_active = FALSE;
2512 }
2513
2514 /* If there were no good recipients (but otherwise there have been no
2515 problems), just set ok TRUE, since we have handled address-specific errors
2516 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2517 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2518 well as body. Set the appropriate timeout value to be used for each chunk.
2519 (Haven't been able to make it work using select() for writing yet.) */
2520
2521 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !lflags.ok)
2522 {
2523 /* Save the first address of the next batch. */
2524 first_addr = addr;
2525
2526 lflags.ok = TRUE;
2527 }
2528 else
2529 {
2530 transport_ctx tctx = {
2531 tblock,
2532 addrlist,
2533 US".", US"..", /* Escaping strings */
2534 topt_use_crlf | topt_escape_headers
2535 | (tblock->body_only ? topt_no_headers : 0)
2536 | (tblock->headers_only ? topt_no_body : 0)
2537 | (tblock->return_path_add ? topt_add_return_path : 0)
2538 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2539 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2540 };
2541
2542 /* If using CHUNKING we need a callback from the generic transport
2543 support to us, for the sending of BDAT smtp commands and the reaping
2544 of responses. The callback needs a whole bunch of state so set up
2545 a transport-context structure to be passed around. */
2546
2547 if (peer_offered & PEER_OFFERED_CHUNKING)
2548 {
2549 tctx.check_string = tctx.escape_string = NULL;
2550 tctx.options |= topt_use_bdat;
2551 tctx.chunk_cb = smtp_chunk_cmd_callback;
2552 tctx.inblock = &inblock;
2553 tctx.outblock = &outblock;
2554 tctx.host = host;
2555 tctx.first_addr = first_addr;
2556 tctx.sync_addr = &sync_addr;
2557 tctx.pending_MAIL = lflags.pending_MAIL;
2558 tctx.pending_BDAT = FALSE;
2559 tctx.good_RCPT = lflags.ok;
2560 tctx.completed_address = &completed_address;
2561 tctx.cmd_count = 0;
2562 tctx.buffer = buffer;
2563 }
2564 else
2565 tctx.options |= topt_end_dot;
2566
2567 /* Save the first address of the next batch. */
2568 first_addr = addr;
2569
2570 /* Responses from CHUNKING commands go in buffer. Otherwise,
2571 there has not been a response. */
2572
2573 buffer[0] = 0;
2574
2575 sigalrm_seen = FALSE;
2576 transport_write_timeout = ob->data_timeout;
2577 smtp_command = US"sending data block"; /* For error messages */
2578 DEBUG(D_transport|D_v)
2579 if (peer_offered & PEER_OFFERED_CHUNKING)
2580 debug_printf(" will write message using CHUNKING\n");
2581 else
2582 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2583 transport_count = 0;
2584
2585 #ifndef DISABLE_DKIM
2586 lflags.ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2587 #else
2588 lflags.ok = transport_write_message(inblock.sock, &tctx, 0);
2589 #endif
2590
2591 /* transport_write_message() uses write() because it is called from other
2592 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2593 it can exit with "Broken pipe" as its error. This really means that the
2594 socket got closed at the far end. */
2595
2596 transport_write_timeout = 0; /* for subsequent transports */
2597
2598 /* Failure can either be some kind of I/O disaster (including timeout),
2599 or the failure of a transport filter or the expansion of added headers.
2600 Or, when CHUNKING, it can be a protocol-detected failure. */
2601
2602 if (!lflags.ok)
2603 goto RESPONSE_FAILED;
2604
2605 /* We used to send the terminating "." explicitly here, but because of
2606 buffering effects at both ends of TCP/IP connections, you don't gain
2607 anything by keeping it separate, so it might as well go in the final
2608 data buffer for efficiency. This is now done by setting the topt_end_dot
2609 flag above. */
2610
2611 smtp_command = US"end of data";
2612
2613 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2614 {
2615 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2616 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2617 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2618 lflags.pending_MAIL, 0,
2619 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2620 {
2621 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2622 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2623 break;
2624
2625 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2626 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2627 case 0: break; /* No 2xx or 5xx, but no probs */
2628
2629 case -1: goto END_OFF; /* Timeout on RCPT */
2630 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2631 }
2632 }
2633
2634 #ifndef DISABLE_PRDR
2635 /* For PRDR we optionally get a partial-responses warning
2636 * followed by the individual responses, before going on with
2637 * the overall response. If we don't get the warning then deal
2638 * with per non-PRDR. */
2639 if(lflags.prdr_active)
2640 {
2641 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2642 ob->final_timeout);
2643 if (!lflags.ok && errno == 0) switch(buffer[0])
2644 {
2645 case '2': lflags.prdr_active = FALSE;
2646 lflags.ok = TRUE;
2647 break;
2648 case '4': errno = ERRNO_DATA4XX;
2649 addrlist->more_errno |=
2650 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2651 break;
2652 }
2653 }
2654 else
2655 #endif
2656
2657 /* For non-PRDR SMTP, we now read a single response that applies to the
2658 whole message. If it is OK, then all the addresses have been delivered. */
2659
2660 if (!lflags.lmtp)
2661 {
2662 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2663 ob->final_timeout);
2664 if (!lflags.ok && errno == 0 && buffer[0] == '4')
2665 {
2666 errno = ERRNO_DATA4XX;
2667 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2668 }
2669 }
2670
2671 /* For LMTP, we get back a response for every RCPT command that we sent;
2672 some may be accepted and some rejected. For those that get a response, their
2673 status is fixed; any that are accepted have been handed over, even if later
2674 responses crash - at least, that's how I read RFC 2033.
2675
2676 If all went well, mark the recipient addresses as completed, record which
2677 host/IPaddress they were delivered to, and cut out RSET when sending another
2678 message down the same channel. Write the completed addresses to the journal
2679 now so that they are recorded in case there is a crash of hardware or
2680 software before the spool gets updated. Also record the final SMTP
2681 confirmation if needed (for SMTP only). */
2682
2683 if (lflags.ok)
2684 {
2685 int flag = '=';
2686 int delivery_time = (int)(time(NULL) - start_delivery_time);
2687 int len;
2688 uschar *conf = NULL;
2689
2690 lflags.send_rset = FALSE;
2691 pipelining_active = FALSE;
2692
2693 /* Set up confirmation if needed - applies only to SMTP */
2694
2695 if (
2696 #ifdef DISABLE_EVENT
2697 LOGGING(smtp_confirmation) &&
2698 #endif
2699 !lflags.lmtp
2700 )
2701 {
2702 const uschar *s = string_printing(buffer);
2703 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2704 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2705 }
2706
2707 /* Process all transported addresses - for LMTP or PRDR, read a status for
2708 each one. */
2709
2710 for (addr = addrlist; addr != first_addr; addr = addr->next)
2711 {
2712 if (addr->transport_return != PENDING_OK) continue;
2713
2714 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2715 remaining addresses. Otherwise, it's a return code for just the one
2716 address. For temporary errors, add a retry item for the address so that
2717 it doesn't get tried again too soon. */
2718
2719 #ifndef DISABLE_PRDR
2720 if (lflags.lmtp || lflags.prdr_active)
2721 #else
2722 if (lflags.lmtp)
2723 #endif
2724 {
2725 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2726 ob->final_timeout))
2727 {
2728 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2729 addr->message = string_sprintf(
2730 #ifndef DISABLE_PRDR
2731 "%s error after %s: %s", lflags.prdr_active ? "PRDR":"LMTP",
2732 #else
2733 "LMTP error after %s: %s",
2734 #endif
2735 big_buffer, string_printing(buffer));
2736 setflag(addr, af_pass_message); /* Allow message to go to user */
2737 if (buffer[0] == '5')
2738 addr->transport_return = FAIL;
2739 else
2740 {
2741 errno = ERRNO_DATA4XX;
2742 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2743 addr->transport_return = DEFER;
2744 #ifndef DISABLE_PRDR
2745 if (!lflags.prdr_active)
2746 #endif
2747 retry_add_item(addr, addr->address_retry_key, 0);
2748 }
2749 continue;
2750 }
2751 completed_address = TRUE; /* NOW we can set this flag */
2752 if (LOGGING(smtp_confirmation))
2753 {
2754 const uschar *s = string_printing(buffer);
2755 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2756 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2757 }
2758 }
2759
2760 /* SMTP, or success return from LMTP for this address. Pass back the
2761 actual host that was used. */
2762
2763 addr->transport_return = OK;
2764 addr->more_errno = delivery_time;
2765 addr->host_used = host;
2766 addr->special_action = flag;
2767 addr->message = conf;
2768 #ifndef DISABLE_PRDR
2769 if (lflags.prdr_active) addr->flags |= af_prdr_used;
2770 #endif
2771 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2772 flag = '-';
2773
2774 #ifndef DISABLE_PRDR
2775 if (!lflags.prdr_active)
2776 #endif
2777 {
2778 /* Update the journal. For homonymic addresses, use the base address plus
2779 the transport name. See lots of comments in deliver.c about the reasons
2780 for the complications when homonyms are involved. Just carry on after
2781 write error, as it may prove possible to update the spool file later. */
2782
2783 if (testflag(addr, af_homonym))
2784 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2785 else
2786 sprintf(CS buffer, "%.500s\n", addr->unique);
2787
2788 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2789 len = Ustrlen(CS buffer);
2790 if (write(journal_fd, buffer, len) != len)
2791 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2792 "%s: %s", buffer, strerror(errno));
2793 }
2794 }
2795
2796 #ifndef DISABLE_PRDR
2797 if (lflags.prdr_active)
2798 {
2799 /* PRDR - get the final, overall response. For any non-success
2800 upgrade all the address statuses. */
2801 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2802 ob->final_timeout);
2803 if (!lflags.ok)
2804 {
2805 if(errno == 0 && buffer[0] == '4')
2806 {
2807 errno = ERRNO_DATA4XX;
2808 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2809 }
2810 for (addr = addrlist; addr != first_addr; addr = addr->next)
2811 if (buffer[0] == '5' || addr->transport_return == OK)
2812 addr->transport_return = PENDING_OK; /* allow set_errno action */
2813 goto RESPONSE_FAILED;
2814 }
2815
2816 /* Update the journal, or setup retry. */
2817 for (addr = addrlist; addr != first_addr; addr = addr->next)
2818 if (addr->transport_return == OK)
2819 {
2820 if (testflag(addr, af_homonym))
2821 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2822 else
2823 sprintf(CS buffer, "%.500s\n", addr->unique);
2824
2825 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2826 len = Ustrlen(CS buffer);
2827 if (write(journal_fd, buffer, len) != len)
2828 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2829 "%s: %s", buffer, strerror(errno));
2830 }
2831 else if (addr->transport_return == DEFER)
2832 retry_add_item(addr, addr->address_retry_key, -2);
2833 }
2834 #endif
2835
2836 /* Ensure the journal file is pushed out to disk. */
2837
2838 if (EXIMfsync(journal_fd) < 0)
2839 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2840 strerror(errno));
2841 }
2842 }
2843
2844
2845 /* Handle general (not specific to one address) failures here. The value of ok
2846 is used to skip over this code on the falling through case. A timeout causes a
2847 deferral. Other errors may defer or fail according to the response code, and
2848 may set up a special errno value, e.g. after connection chopped, which is
2849 assumed if errno == 0 and there is no text in the buffer. If control reaches
2850 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2851 the problem is not related to this specific message. */
2852
2853 if (!lflags.ok)
2854 {
2855 int code, set_rc;
2856 uschar * set_message;
2857
2858 RESPONSE_FAILED:
2859 {
2860 save_errno = errno;
2861 message = NULL;
2862 lflags.send_quit = check_response(host, &save_errno, addrlist->more_errno,
2863 buffer, &code, &message, &pass_message);
2864 goto FAILED;
2865 }
2866
2867 SEND_FAILED:
2868 {
2869 save_errno = errno;
2870 code = '4';
2871 message = US string_sprintf("send() to %s [%s] failed: %s",
2872 host->name, host->address, strerror(save_errno));
2873 lflags.send_quit = FALSE;
2874 goto FAILED;
2875 }
2876
2877 /* This label is jumped to directly when a TLS negotiation has failed,
2878 or was not done for a host for which it is required. Values will be set
2879 in message and save_errno, and setting_up will always be true. Treat as
2880 a temporary error. */
2881
2882 #ifdef SUPPORT_TLS
2883 TLS_FAILED:
2884 code = '4';
2885 #endif
2886
2887 /* If the failure happened while setting up the call, see if the failure was
2888 a 5xx response (this will either be on connection, or following HELO - a 5xx
2889 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2890 never going to accept them. For other errors during setting up (timeouts or
2891 whatever), defer all addresses, and yield DEFER, so that the host is not
2892 tried again for a while. */
2893
2894 FAILED:
2895 lflags.ok = FALSE; /* For when reached by GOTO */
2896 set_message = message;
2897
2898 if (lflags.setting_up)
2899 if (code == '5')
2900 set_rc = FAIL;
2901 else
2902 yield = set_rc = DEFER;
2903
2904 /* We want to handle timeouts after MAIL or "." and loss of connection after
2905 "." specially. They can indicate a problem with the sender address or with
2906 the contents of the message rather than a real error on the connection. These
2907 cases are treated in the same way as a 4xx response. This next bit of code
2908 does the classification. */
2909
2910 else
2911 {
2912 BOOL message_error;
2913
2914 switch(save_errno)
2915 {
2916 #ifdef SUPPORT_I18N
2917 case ERRNO_UTF8_FWD:
2918 code = '5';
2919 /*FALLTHROUGH*/
2920 #endif
2921 case 0:
2922 case ERRNO_MAIL4XX:
2923 case ERRNO_DATA4XX:
2924 message_error = TRUE;
2925 break;
2926
2927 case ETIMEDOUT:
2928 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2929 Ustrncmp(smtp_command,"end ",4) == 0;
2930 break;
2931
2932 case ERRNO_SMTPCLOSED:
2933 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2934 break;
2935
2936 default:
2937 message_error = FALSE;
2938 break;
2939 }
2940
2941 /* Handle the cases that are treated as message errors. These are:
2942
2943 (a) negative response or timeout after MAIL
2944 (b) negative response after DATA
2945 (c) negative response or timeout or dropped connection after "."
2946 (d) utf8 support required and not offered
2947
2948 It won't be a negative response or timeout after RCPT, as that is dealt
2949 with separately above. The action in all cases is to set an appropriate
2950 error code for all the addresses, but to leave yield set to OK because the
2951 host itself has not failed. Of course, it might in practice have failed
2952 when we've had a timeout, but if so, we'll discover that at the next
2953 delivery attempt. For a temporary error, set the message_defer flag, and
2954 write to the logs for information if this is not the last host. The error
2955 for the last host will be logged as part of the address's log line. */
2956
2957 if (message_error)
2958 {
2959 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2960
2961 /* If there's an errno, the message contains just the identity of
2962 the host. */
2963
2964 if (code == '5')
2965 set_rc = FAIL;
2966 else /* Anything other than 5 is treated as temporary */
2967 {
2968 set_rc = DEFER;
2969 if (save_errno > 0)
2970 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2971 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2972 msglog_line(host, message);
2973 *message_defer = TRUE;
2974 }
2975 }
2976
2977 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2978 ".", or some other transportation error. We defer all addresses and yield
2979 DEFER, except for the case of failed add_headers expansion, or a transport
2980 filter failure, when the yield should be ERROR, to stop it trying other
2981 hosts. */
2982
2983 else
2984 {
2985 set_rc = DEFER;
2986 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2987 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2988 }
2989 }
2990
2991 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2992 #ifdef EXPERIMENTAL_DSN_INFO
2993 , smtp_greeting, helo_response
2994 #endif
2995 );
2996 }
2997
2998
2999 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3000 SMTP session tidily. However, if there were too many addresses to send in one
3001 message (indicated by first_addr being non-NULL) we want to carry on with the
3002 rest of them. Also, it is desirable to send more than one message down the SMTP
3003 connection if there are several waiting, provided we haven't already sent so
3004 many as to hit the configured limit. The function transport_check_waiting looks
3005 for a waiting message and returns its id. Then transport_pass_socket tries to
3006 set up a continued delivery by passing the socket on to another process. The
3007 variable send_rset is FALSE if a message has just been successfully transfered.
3008
3009 If we are already sending down a continued channel, there may be further
3010 addresses not yet delivered that are aimed at the same host, but which have not
3011 been passed in this run of the transport. In this case, continue_more will be
3012 true, and all we should do is send RSET if necessary, and return, leaving the
3013 channel open.
3014
3015 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3016 do not want to continue with other messages down the same channel, because that
3017 can lead to looping between two or more messages, all with the same,
3018 temporarily failing address(es). [The retry information isn't updated yet, so
3019 new processes keep on trying.] We probably also don't want to try more of this
3020 message's addresses either.
3021
3022 If we have started a TLS session, we have to end it before passing the
3023 connection to a new process. However, not all servers can handle this (Exim
3024 can), so we do not pass such a connection on if the host matches
3025 hosts_nopass_tls. */
3026
3027 DEBUG(D_transport)
3028 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3029 "yield=%d first_address is %sNULL\n", lflags.ok, lflags.send_quit,
3030 lflags.send_rset, continue_more, yield, first_addr ? "not " : "");
3031
3032 if (completed_address && lflags.ok && lflags.send_quit)
3033 {
3034 BOOL more;
3035 smtp_compare_t t_compare;
3036
3037 t_compare.tblock = tblock;
3038 t_compare.current_sender_address = sender_address;
3039
3040 if ( first_addr != NULL
3041 || continue_more
3042 || ( ( tls_out.active < 0
3043 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
3044 )
3045 &&
3046 transport_check_waiting(tblock->name, host->name,
3047 tblock->connection_max_messages, new_message_id, &more,
3048 (oicf)smtp_are_same_identities, (void*)&t_compare)
3049 ) )
3050 {
3051 uschar *msg;
3052 BOOL pass_message;
3053
3054 if (lflags.send_rset)
3055 {
3056 if (! (lflags.ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3057 {
3058 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3059 host->address, strerror(save_errno));
3060 lflags.send_quit = FALSE;
3061 }
3062 else if (! (lflags.ok = smtp_read_response(&inblock, buffer,
3063 sizeof(buffer), '2', ob->command_timeout)))
3064 {
3065 int code;
3066 lflags.send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3067 &pass_message);
3068 if (!lflags.send_quit)
3069 {
3070 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3071 host->name, host->address, msg);
3072 }
3073 }
3074 }
3075
3076 /* Either RSET was not needed, or it succeeded */
3077
3078 if (lflags.ok)
3079 {
3080 if (first_addr != NULL) /* More addresses still to be sent */
3081 { /* in this run of the transport */
3082 continue_sequence++; /* Causes * in logging */
3083 goto SEND_MESSAGE;
3084 }
3085 if (continue_more) return yield; /* More addresses for another run */
3086
3087 /* Pass the socket to a new Exim process. Before doing so, we must shut
3088 down TLS. Not all MTAs allow for the continuation of the SMTP session
3089 when TLS is shut down. We test for this by sending a new EHLO. If we
3090 don't get a good response, we don't attempt to pass the socket on. */
3091
3092 #ifdef SUPPORT_TLS
3093 if (tls_out.active >= 0)
3094 {
3095 tls_close(FALSE, TRUE);
3096 smtp_peer_options = smtp_peer_options_wrap;
3097 if (lflags.smtps)
3098 lflags.ok = FALSE;
3099 else
3100 lflags.ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3101 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3102 ob->command_timeout);
3103 }
3104 #endif
3105
3106 /* If the socket is successfully passed, we musn't send QUIT (or
3107 indeed anything!) from here. */
3108
3109 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3110 propagate it from the initial
3111 */
3112 if (lflags.ok && transport_pass_socket(tblock->name, host->name,
3113 host->address, new_message_id, inblock.sock))
3114 lflags.send_quit = FALSE;
3115 }
3116
3117 /* If RSET failed and there are addresses left, they get deferred. */
3118
3119 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3120 #ifdef EXPERIMENTAL_DSN_INFO
3121 , smtp_greeting, helo_response
3122 #endif
3123 );
3124 }
3125 }
3126
3127 /* End off tidily with QUIT unless the connection has died or the socket has
3128 been passed to another process. There has been discussion on the net about what
3129 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3130 to wait for a response, but on the other hand, there isn't anything one can do
3131 with an error response, other than log it. Exim used to do that. However,
3132 further discussion suggested that it is positively advantageous not to wait for
3133 the response, but to close the session immediately. This is supposed to move
3134 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3135 load from the server. (Hosts that are both servers and clients may not see much
3136 difference, of course.) Further discussion indicated that this was safe to do
3137 on Unix systems which have decent implementations of TCP/IP that leave the
3138 connection around for a while (TIME_WAIT) after the application has gone away.
3139 This enables the response sent by the server to be properly ACKed rather than
3140 timed out, as can happen on broken TCP/IP implementations on other OS.
3141
3142 This change is being made on 31-Jul-98. After over a year of trouble-free
3143 operation, the old commented-out code was removed on 17-Sep-99. */
3144
3145 SEND_QUIT:
3146 if (lflags.send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3147
3148 END_OFF:
3149
3150 #ifdef SUPPORT_TLS
3151 tls_close(FALSE, TRUE);
3152 #endif
3153
3154 /* Close the socket, and return the appropriate value, first setting
3155 works because the NULL setting is passed back to the calling process, and
3156 remote_max_parallel is forced to 1 when delivering over an existing connection,
3157
3158 If all went well and continue_more is set, we shouldn't actually get here if
3159 there are further addresses, as the return above will be taken. However,
3160 writing RSET might have failed, or there may be other addresses whose hosts are
3161 specified in the transports, and therefore not visible at top level, in which
3162 case continue_more won't get set. */
3163
3164 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3165 if (lflags.send_quit)
3166 {
3167 shutdown(outblock.sock, SHUT_WR);
3168 if (fcntl(inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3169 for (rc = 16; read(inblock.sock, inbuffer, sizeof(inbuffer)) > 0 && rc > 0;)
3170 rc--; /* drain socket */
3171 }
3172 (void)close(inblock.sock);
3173
3174 #ifndef DISABLE_EVENT
3175 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3176 #endif
3177
3178 continue_transport = NULL;
3179 continue_hostname = NULL;
3180 return yield;
3181 }
3182
3183
3184
3185
3186 /*************************************************
3187 * Closedown entry point *
3188 *************************************************/
3189
3190 /* This function is called when exim is passed an open smtp channel
3191 from another incarnation, but the message which it has been asked
3192 to deliver no longer exists. The channel is on stdin.
3193
3194 We might do fancy things like looking for another message to send down
3195 the channel, but if the one we sought has gone, it has probably been
3196 delivered by some other process that itself will seek further messages,
3197 so just close down our connection.
3198
3199 Argument: pointer to the transport instance block
3200 Returns: nothing
3201 */
3202
3203 void
3204 smtp_transport_closedown(transport_instance *tblock)
3205 {
3206 smtp_transport_options_block *ob =
3207 (smtp_transport_options_block *)(tblock->options_block);
3208 smtp_inblock inblock;
3209 smtp_outblock outblock;
3210 uschar buffer[256];
3211 uschar inbuffer[4096];
3212 uschar outbuffer[16];
3213
3214 inblock.sock = fileno(stdin);
3215 inblock.buffer = inbuffer;
3216 inblock.buffersize = sizeof(inbuffer);
3217 inblock.ptr = inbuffer;
3218 inblock.ptrend = inbuffer;
3219
3220 outblock.sock = inblock.sock;
3221 outblock.buffersize = sizeof(outbuffer);
3222 outblock.buffer = outbuffer;
3223 outblock.ptr = outbuffer;
3224 outblock.cmd_count = 0;
3225 outblock.authenticating = FALSE;
3226
3227 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3228 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3229 ob->command_timeout);
3230 (void)close(inblock.sock);
3231 }
3232
3233
3234
3235 /*************************************************
3236 * Prepare addresses for delivery *
3237 *************************************************/
3238
3239 /* This function is called to flush out error settings from previous delivery
3240 attempts to other hosts. It also records whether we got here via an MX record
3241 or not in the more_errno field of the address. We are interested only in
3242 addresses that are still marked DEFER - others may have got delivered to a
3243 previously considered IP address. Set their status to PENDING_DEFER to indicate
3244 which ones are relevant this time.
3245
3246 Arguments:
3247 addrlist the list of addresses
3248 host the host we are delivering to
3249
3250 Returns: the first address for this delivery
3251 */
3252
3253 static address_item *
3254 prepare_addresses(address_item *addrlist, host_item *host)
3255 {
3256 address_item *first_addr = NULL;
3257 address_item *addr;
3258 for (addr = addrlist; addr; addr = addr->next)
3259 if (addr->transport_return == DEFER)
3260 {
3261 if (!first_addr) first_addr = addr;
3262 addr->transport_return = PENDING_DEFER;
3263 addr->basic_errno = 0;
3264 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3265 addr->message = NULL;
3266 #ifdef SUPPORT_TLS
3267 addr->cipher = NULL;
3268 addr->ourcert = NULL;
3269 addr->peercert = NULL;
3270 addr->peerdn = NULL;
3271 addr->ocsp = OCSP_NOT_REQ;
3272 #endif
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 addr->smtp_greeting = NULL;
3275 addr->helo_response = NULL;
3276 #endif
3277 }
3278 return first_addr;
3279 }
3280
3281
3282
3283 /*************************************************
3284 * Main entry point *
3285 *************************************************/
3286
3287 /* See local README for interface details. As this is a remote transport, it is
3288 given a chain of addresses to be delivered in one connection, if possible. It
3289 always returns TRUE, indicating that each address has its own independent
3290 status set, except if there is a setting up problem, in which case it returns
3291 FALSE. */
3292
3293 BOOL
3294 smtp_transport_entry(
3295 transport_instance *tblock, /* data for this instantiation */
3296 address_item *addrlist) /* addresses we are working on */
3297 {
3298 int cutoff_retry;
3299 int port;
3300 int hosts_defer = 0;
3301 int hosts_fail = 0;
3302 int hosts_looked_up = 0;
3303 int hosts_retry = 0;
3304 int hosts_serial = 0;
3305 int hosts_total = 0;
3306 int total_hosts_tried = 0;
3307 address_item *addr;
3308 BOOL expired = TRUE;
3309 uschar *expanded_hosts = NULL;
3310 uschar *pistring;
3311 uschar *tid = string_sprintf("%s transport", tblock->name);
3312 smtp_transport_options_block *ob =
3313 (smtp_transport_options_block *)(tblock->options_block);
3314 host_item *hostlist = addrlist->host_list;
3315 host_item *host = NULL;
3316
3317 DEBUG(D_transport)
3318 {
3319 debug_printf("%s transport entered\n", tblock->name);
3320 for (addr = addrlist; addr; addr = addr->next)
3321 debug_printf(" %s\n", addr->address);
3322 if (hostlist)
3323 {
3324 debug_printf("hostlist:\n");
3325 for (host = hostlist; host; host = host->next)
3326 debug_printf(" %s:%d\n", host->name, host->port);
3327 }
3328 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3329 continue_hostname, continue_host_address);
3330 }
3331
3332 /* Set the flag requesting that these hosts be added to the waiting
3333 database if the delivery fails temporarily or if we are running with
3334 queue_smtp or a 2-stage queue run. This gets unset for certain
3335 kinds of error, typically those that are specific to the message. */
3336
3337 update_waiting = TRUE;
3338
3339 /* If a host list is not defined for the addresses - they must all have the
3340 same one in order to be passed to a single transport - or if the transport has
3341 a host list with hosts_override set, use the host list supplied with the
3342 transport. It is an error for this not to exist. */
3343
3344 if (!hostlist || (ob->hosts_override && ob->hosts))
3345 {
3346 if (!ob->hosts)
3347 {
3348 addrlist->message = string_sprintf("%s transport called with no hosts set",
3349 tblock->name);
3350 addrlist->transport_return = PANIC;
3351 return FALSE; /* Only top address has status */
3352 }
3353
3354 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3355 ob->hosts);
3356
3357 /* If the transport's host list contains no '$' characters, and we are not
3358 randomizing, it is fixed and therefore a chain of hosts can be built once
3359 and for all, and remembered for subsequent use by other calls to this
3360 transport. If, on the other hand, the host list does contain '$', or we are
3361 randomizing its order, we have to rebuild it each time. In the fixed case,
3362 as the hosts string will never be used again, it doesn't matter that we
3363 replace all the : characters with zeros. */
3364
3365 if (!ob->hostlist)
3366 {
3367 uschar *s = ob->hosts;
3368
3369 if (Ustrchr(s, '$') != NULL)
3370 {
3371 if (!(expanded_hosts = expand_string(s)))
3372 {
3373 addrlist->message = string_sprintf("failed to expand list of hosts "
3374 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3375 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3376 return FALSE; /* Only top address has status */
3377 }
3378 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3379 "\"%s\"\n", s, expanded_hosts);
3380 s = expanded_hosts;
3381 }
3382 else
3383 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3384
3385 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3386
3387 /* Check that the expansion yielded something useful. */
3388 if (!hostlist)
3389 {
3390 addrlist->message =
3391 string_sprintf("%s transport has empty hosts setting", tblock->name);
3392 addrlist->transport_return = PANIC;
3393 return FALSE; /* Only top address has status */
3394 }
3395
3396 /* If there was no expansion of hosts, save the host list for
3397 next time. */
3398
3399 if (!expanded_hosts) ob->hostlist = hostlist;
3400 }
3401
3402 /* This is not the first time this transport has been run in this delivery;
3403 the host list was built previously. */
3404
3405 else
3406 hostlist = ob->hostlist;
3407 }
3408
3409 /* The host list was supplied with the address. If hosts_randomize is set, we
3410 must sort it into a random order if it did not come from MX records and has not
3411 already been randomized (but don't bother if continuing down an existing
3412 connection). */
3413
3414 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3415 {
3416 host_item *newlist = NULL;
3417 while (hostlist)
3418 {
3419 host_item *h = hostlist;
3420 hostlist = hostlist->next;
3421
3422 h->sort_key = random_number(100);
3423
3424 if (!newlist)
3425 {
3426 h->next = NULL;
3427 newlist = h;
3428 }
3429 else if (h->sort_key < newlist->sort_key)
3430 {
3431 h->next = newlist;
3432 newlist = h;
3433 }
3434 else
3435 {
3436 host_item *hh = newlist;
3437 while (hh->next)
3438 {
3439 if (h->sort_key < hh->next->sort_key) break;
3440 hh = hh->next;
3441 }
3442 h->next = hh->next;
3443 hh->next = h;
3444 }
3445 }
3446
3447 hostlist = addrlist->host_list = newlist;
3448 }
3449
3450 /* Sort out the default port. */
3451
3452 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3453
3454 /* For each host-plus-IP-address on the list:
3455
3456 . If this is a continued delivery and the host isn't the one with the
3457 current connection, skip.
3458
3459 . If the status is unusable (i.e. previously failed or retry checked), skip.
3460
3461 . If no IP address set, get the address, either by turning the name into
3462 an address, calling gethostbyname if gethostbyname is on, or by calling
3463 the DNS. The DNS may yield multiple addresses, in which case insert the
3464 extra ones into the list.
3465
3466 . Get the retry data if not previously obtained for this address and set the
3467 field which remembers the state of this address. Skip if the retry time is
3468 not reached. If not, remember whether retry data was found. The retry string
3469 contains both the name and the IP address.
3470
3471 . Scan the list of addresses and mark those whose status is DEFER as
3472 PENDING_DEFER. These are the only ones that will be processed in this cycle
3473 of the hosts loop.
3474
3475 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3476 Some addresses may be successfully delivered, others may fail, and yet
3477 others may get temporary errors and so get marked DEFER.
3478
3479 . The return from the delivery attempt is OK if a connection was made and a
3480 valid SMTP dialogue was completed. Otherwise it is DEFER.
3481
3482 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3483
3484 . If fail to connect, or other defer state, add a retry item.
3485
3486 . If there are any addresses whose status is still DEFER, carry on to the
3487 next host/IPaddress, unless we have tried the number of hosts given
3488 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3489 there is some fancy logic for hosts_max_try that means its limit can be
3490 overstepped in some circumstances.
3491
3492 If we get to the end of the list, all hosts have deferred at least one address,
3493 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3494 delivery attempt to those hosts whose last try was before the arrival time of
3495 the current message. To cope with this, we have to go round the loop a second
3496 time. After that, set the status and error data for any addresses that haven't
3497 had it set already. */
3498
3499 for (cutoff_retry = 0;
3500 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3501 cutoff_retry++)
3502 {
3503 host_item *nexthost = NULL;
3504 int unexpired_hosts_tried = 0;
3505
3506 for (host = hostlist;
3507 host
3508 && unexpired_hosts_tried < ob->hosts_max_try
3509 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3510 host = nexthost)
3511 {
3512 int rc;
3513 int host_af;
3514 uschar *rs;
3515 BOOL host_is_expired = FALSE;
3516 BOOL message_defer = FALSE;
3517 BOOL some_deferred = FALSE;
3518 address_item *first_addr = NULL;
3519 uschar *interface = NULL;
3520 uschar *retry_host_key = NULL;
3521 uschar *retry_message_key = NULL;
3522 uschar *serialize_key = NULL;
3523
3524 /* Default next host is next host. :-) But this can vary if the
3525 hosts_max_try limit is hit (see below). It may also be reset if a host
3526 address is looked up here (in case the host was multihomed). */
3527
3528 nexthost = host->next;
3529
3530 /* If the address hasn't yet been obtained from the host name, look it up
3531 now, unless the host is already marked as unusable. If it is marked as
3532 unusable, it means that the router was unable to find its IP address (in
3533 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3534 the lookup failed last time. We don't get this far if *all* MX records
3535 point to non-existent hosts; that is treated as a hard error.
3536
3537 We can just skip this host entirely. When the hosts came from the router,
3538 the address will timeout based on the other host(s); when the address is
3539 looked up below, there is an explicit retry record added.
3540
3541 Note that we mustn't skip unusable hosts if the address is not unset; they
3542 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3543
3544 if (!host->address)
3545 {
3546 int new_port, flags;
3547 host_item *hh;
3548
3549 if (host->status >= hstatus_unusable)
3550 {
3551 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3552 host->name);
3553 continue;
3554 }
3555
3556 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3557
3558 /* The host name is permitted to have an attached port. Find it, and
3559 strip it from the name. Just remember it for now. */
3560
3561 new_port = host_item_get_port(host);
3562
3563 /* Count hosts looked up */
3564
3565 hosts_looked_up++;
3566
3567 /* Find by name if so configured, or if it's an IP address. We don't
3568 just copy the IP address, because we need the test-for-local to happen. */
3569
3570 flags = HOST_FIND_BY_A;
3571 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3572 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3573
3574 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3575 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3576 else
3577 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3578 &ob->dnssec, /* domains for request/require */
3579 NULL, NULL);
3580
3581 /* Update the host (and any additional blocks, resulting from
3582 multihoming) with a host-specific port, if any. */
3583
3584 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3585
3586 /* Failure to find the host at this time (usually DNS temporary failure)
3587 is really a kind of routing failure rather than a transport failure.
3588 Therefore we add a retry item of the routing kind, not to stop us trying
3589 to look this name up here again, but to ensure the address gets timed
3590 out if the failures go on long enough. A complete failure at this point
3591 commonly points to a configuration error, but the best action is still
3592 to carry on for the next host. */
3593
3594 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3595 {
3596 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3597 expired = FALSE;
3598 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3599 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3600 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3601 host->status = hstatus_unusable;
3602
3603 for (addr = addrlist; addr; addr = addr->next)
3604 {
3605 if (addr->transport_return != DEFER) continue;
3606 addr->basic_errno = ERRNO_UNKNOWNHOST;
3607 addr->message =
3608 string_sprintf("failed to lookup IP address for %s", host->name);
3609 }
3610 continue;
3611 }
3612
3613 /* If the host is actually the local host, we may have a problem, or
3614 there may be some cunning configuration going on. In the problem case,
3615 log things and give up. The default transport status is already DEFER. */
3616
3617 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3618 {
3619 for (addr = addrlist; addr; addr = addr->next)
3620 {
3621 addr->basic_errno = 0;
3622 addr->message = string_sprintf("%s transport found host %s to be "
3623 "local", tblock->name, host->name);
3624 }
3625 goto END_TRANSPORT;
3626 }
3627 } /* End of block for IP address lookup */
3628
3629 /* If this is a continued delivery, we are interested only in the host
3630 which matches the name of the existing open channel. The check is put
3631 here after the local host lookup, in case the name gets expanded as a
3632 result of the lookup. Set expired FALSE, to save the outer loop executing
3633 twice. */
3634
3635 if ( continue_hostname
3636 && ( Ustrcmp(continue_hostname, host->name) != 0
3637 || Ustrcmp(continue_host_address, host->address) != 0
3638 ) )
3639 {
3640 expired = FALSE;
3641 continue; /* With next host */
3642 }
3643
3644 /* Reset the default next host in case a multihomed host whose addresses
3645 are not looked up till just above added to the host list. */
3646
3647 nexthost = host->next;
3648
3649 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3650 domain is in queue_smtp_domains, we don't actually want to attempt any
3651 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3652 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3653 were not in it. We don't want to hold up all SMTP deliveries! Except when
3654 doing a two-stage queue run, don't do this if forcing. */
3655
3656 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3657 match_isinlist(addrlist->domain,
3658 (const uschar **)&queue_smtp_domains, 0,
3659 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3660 {
3661 expired = FALSE;
3662 for (addr = addrlist; addr; addr = addr->next)
3663 if (addr->transport_return == DEFER)
3664 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3665 continue; /* With next host */
3666 }
3667
3668 /* Count hosts being considered - purely for an intelligent comment
3669 if none are usable. */
3670
3671 hosts_total++;
3672
3673 /* Set $host and $host address now in case they are needed for the
3674 interface expansion or the serialize_hosts check; they remain set if an
3675 actual delivery happens. */
3676
3677 deliver_host = host->name;
3678 deliver_host_address = host->address;
3679 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3680 : host->dnssec == DS_NO ? US"no"
3681 : US"";
3682
3683 /* Set up a string for adding to the retry key if the port number is not
3684 the standard SMTP port. A host may have its own port setting that overrides
3685 the default. */
3686
3687 pistring = string_sprintf(":%d", host->port == PORT_NONE
3688 ? port : host->port);
3689 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3690
3691 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3692 string is set, even if constant (as different transports can have different
3693 constant settings), we must add it to the key that is used for retries,
3694 because connections to the same host from a different interface should be
3695 treated separately. */
3696
3697 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3698 if ((rs = ob->interface) && *rs)
3699 {
3700 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3701 return FALSE;
3702 pistring = string_sprintf("%s/%s", pistring, interface);
3703 }
3704
3705 /* The first time round the outer loop, check the status of the host by
3706 inspecting the retry data. The second time round, we are interested only
3707 in expired hosts that haven't been tried since this message arrived. */
3708
3709 if (cutoff_retry == 0)
3710 {
3711 BOOL incl_ip;
3712 /* Ensure the status of the address is set by checking retry data if
3713 necessary. There may be host-specific retry data (applicable to all
3714 messages) and also data for retries of a specific message at this host.
3715 If either of these retry records are actually read, the keys used are
3716 returned to save recomputing them later. */
3717
3718 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3719 US"retry_include_ip_address", ob->retry_include_ip_address,
3720 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3721 continue; /* with next host */
3722
3723 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3724 incl_ip, &retry_host_key, &retry_message_key);
3725
3726 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3727 (host->address == NULL)? US"" : host->address, pistring,
3728 (host->status == hstatus_usable)? "usable" :
3729 (host->status == hstatus_unusable)? "unusable" :
3730 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3731
3732 /* Skip this address if not usable at this time, noting if it wasn't
3733 actually expired, both locally and in the address. */
3734
3735 switch (host->status)
3736 {
3737 case hstatus_unusable:
3738 expired = FALSE;
3739 setflag(addrlist, af_retry_skipped);
3740 /* Fall through */
3741
3742 case hstatus_unusable_expired:
3743 switch (host->why)
3744 {
3745 case hwhy_retry: hosts_retry++; break;
3746 case hwhy_failed: hosts_fail++; break;
3747 case hwhy_deferred: hosts_defer++; break;
3748 }
3749
3750 /* If there was a retry message key, implying that previously there
3751 was a message-specific defer, we don't want to update the list of
3752 messages waiting for these hosts. */
3753
3754 if (retry_message_key) update_waiting = FALSE;
3755 continue; /* With the next host or IP address */
3756 }
3757 }
3758
3759 /* Second time round the loop: if the address is set but expired, and
3760 the message is newer than the last try, let it through. */
3761
3762 else
3763 {
3764 if ( !host->address
3765 || host->status != hstatus_unusable_expired
3766 || host->last_try > received_time)
3767 continue;
3768 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3769 host->name, host->address, pistring);
3770 host_is_expired = TRUE;
3771 }
3772
3773 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3774 it remains TRUE only if all hosts are expired and none are actually tried.
3775 */
3776
3777 expired = FALSE;
3778
3779 /* If this host is listed as one to which access must be serialized,
3780 see if another Exim process has a connection to it, and if so, skip
3781 this host. If not, update the database to record our connection to it
3782 and remember this for later deletion. Do not do any of this if we are
3783 sending the message down a pre-existing connection. */
3784
3785 if ( !continue_hostname
3786 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3787 {
3788 serialize_key = string_sprintf("host-serialize-%s", host->name);
3789 if (!enq_start(serialize_key, 1))
3790 {
3791 DEBUG(D_transport)
3792 debug_printf("skipping host %s because another Exim process "
3793 "is connected to it\n", host->name);
3794 hosts_serial++;
3795 continue;
3796 }
3797 }
3798
3799 /* OK, we have an IP address that is not waiting for its retry time to
3800 arrive (it might be expired) OR (second time round the loop) we have an
3801 expired host that hasn't been tried since the message arrived. Have a go
3802 at delivering the message to it. First prepare the addresses by flushing
3803 out the result of previous attempts, and finding the first address that
3804 is still to be delivered. */
3805
3806 first_addr = prepare_addresses(addrlist, host);
3807
3808 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3809 message_id, host->name, host->address, addrlist->address,
3810 addrlist->next ? ", ..." : "");
3811
3812 set_process_info("delivering %s to %s [%s] (%s%s)",
3813 message_id, host->name, host->address, addrlist->address,
3814 addrlist->next ? ", ..." : "");
3815
3816 /* This is not for real; don't do the delivery. If there are
3817 any remaining hosts, list them. */
3818
3819 if (dont_deliver)
3820 {
3821 host_item *host2;
3822 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3823 for (addr = addrlist; addr; addr = addr->next)
3824 {
3825 addr->host_used = host;
3826 addr->special_action = '*';
3827 addr->message = US"delivery bypassed by -N option";
3828 }
3829 DEBUG(D_transport)
3830 {
3831 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3832 "*** host and remaining hosts:\n", tblock->name);
3833 for (host2 = host; host2; host2 = host2->next)
3834 debug_printf(" %s [%s]\n", host2->name,
3835 host2->address ? host2->address : US"unset");
3836 }
3837 rc = OK;
3838 }
3839
3840 /* This is for real. If the host is expired, we don't count it for
3841 hosts_max_retry. This ensures that all hosts must expire before an address
3842 is timed out, unless hosts_max_try_hardlimit (which protects against
3843 lunatic DNS configurations) is reached.
3844
3845 If the host is not expired and we are about to hit the hosts_max_retry
3846 limit, check to see if there is a subsequent hosts with a different MX
3847 value. If so, make that the next host, and don't count this one. This is a
3848 heuristic to make sure that different MXs do get tried. With a normal kind
3849 of retry rule, they would get tried anyway when the earlier hosts were
3850 delayed, but if the domain has a "retry every time" type of rule - as is
3851 often used for the the very large ISPs, that won't happen. */
3852
3853 else
3854 {
3855 host_item * thost;
3856 /* Make a copy of the host if it is local to this invocation
3857 of the transport. */
3858
3859 if (expanded_hosts)
3860 {
3861 thost = store_get(sizeof(host_item));
3862 *thost = *host;
3863 thost->name = string_copy(host->name);
3864 thost->address = string_copy(host->address);
3865 }
3866 else
3867 thost = host;
3868
3869 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3870 {
3871 host_item *h;
3872 DEBUG(D_transport)
3873 debug_printf("hosts_max_try limit reached with this host\n");
3874 for (h = host; h; h = h->next) if (h->mx != host->mx)
3875 {
3876 nexthost = h;
3877 unexpired_hosts_tried--;
3878 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3879 "and will be tried\n");
3880 break;
3881 }
3882 }
3883
3884 /* Attempt the delivery. */
3885
3886 total_hosts_tried++;
3887 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3888 &message_defer, FALSE);
3889
3890 /* Yield is one of:
3891 OK => connection made, each address contains its result;
3892 message_defer is set for message-specific defers (when all
3893 recipients are marked defer)
3894 DEFER => there was a non-message-specific delivery problem;
3895 ERROR => there was a problem setting up the arguments for a filter,
3896 or there was a problem with expanding added headers
3897 */
3898
3899 /* If the result is not OK, there was a non-message-specific problem.
3900 If the result is DEFER, we need to write to the logs saying what happened
3901 for this particular host, except in the case of authentication and TLS
3902 failures, where the log has already been written. If all hosts defer a
3903 general message is written at the end. */
3904
3905 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3906 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3907 write_logs(first_addr, host);
3908
3909 #ifndef DISABLE_EVENT
3910 if (rc == DEFER)
3911 deferred_event_raise(first_addr, host);
3912 #endif
3913
3914 /* If STARTTLS was accepted, but there was a failure in setting up the
3915 TLS session (usually a certificate screwup), and the host is not in
3916 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3917 TLS forcibly turned off. We have to start from scratch with a new SMTP
3918 connection. That's why the retry is done from here, not from within
3919 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3920 session, so the in-clear transmission after those errors, if permitted,
3921 happens inside smtp_deliver().] */
3922
3923 #ifdef SUPPORT_TLS
3924 if ( rc == DEFER
3925 && first_addr->basic_errno == ERRNO_TLSFAILURE
3926 && ob->tls_tempfail_tryclear
3927 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3928 )
3929 {
3930 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3931 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3932 first_addr = prepare_addresses(addrlist, host);
3933 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3934 &message_defer, TRUE);
3935 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3936 write_logs(first_addr, host);
3937 # ifndef DISABLE_EVENT
3938 if (rc == DEFER)
3939 deferred_event_raise(first_addr, host);
3940 # endif
3941 }
3942 #endif /*SUPPORT_TLS*/
3943 }
3944
3945 /* Delivery attempt finished */
3946
3947 rs = rc == OK ? US"OK"
3948 : rc == DEFER ? US"DEFER"
3949 : rc == ERROR ? US"ERROR"
3950 : US"?";
3951
3952 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3953 message_id, host->name, host->address, addrlist->address,
3954 addrlist->next ? " (& others)" : "", rs);
3955
3956 /* Release serialization if set up */
3957
3958 if (serialize_key) enq_end(serialize_key);
3959
3960 /* If the result is DEFER, or if a host retry record is known to exist, we
3961 need to add an item to the retry chain for updating the retry database
3962 at the end of delivery. We only need to add the item to the top address,
3963 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3964 for any other delivery attempts using the same address. (It is copied into
3965 the unusable tree at the outer level, so even if different address blocks
3966 contain the same address, it still won't get tried again.) */
3967
3968 if (rc == DEFER || retry_host_key)
3969 {
3970 int delete_flag = rc != DEFER ? rf_delete : 0;
3971 if (!retry_host_key)
3972 {
3973 BOOL incl_ip;
3974 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3975 US"retry_include_ip_address", ob->retry_include_ip_address,
3976 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3977 incl_ip = TRUE; /* error; use most-specific retry record */
3978
3979 retry_host_key = incl_ip
3980 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3981 : string_sprintf("T:%S%s", host->name, pistring);
3982 }
3983
3984 /* If a delivery of another message over an existing SMTP connection
3985 yields DEFER, we do NOT set up retry data for the host. This covers the
3986 case when there are delays in routing the addresses in the second message
3987 that are so long that the server times out. This is alleviated by not
3988 routing addresses that previously had routing defers when handling an
3989 existing connection, but even so, this case may occur (e.g. if a
3990 previously happily routed address starts giving routing defers). If the
3991 host is genuinely down, another non-continued message delivery will
3992 notice it soon enough. */
3993
3994 if (delete_flag != 0 || !continue_hostname)
3995 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3996
3997 /* We may have tried an expired host, if its retry time has come; ensure
3998 the status reflects the expiry for the benefit of any other addresses. */
3999
4000 if (rc == DEFER)
4001 {
4002 host->status = host_is_expired
4003 ? hstatus_unusable_expired : hstatus_unusable;
4004 host->why = hwhy_deferred;
4005 }
4006 }
4007
4008 /* If message_defer is set (host was OK, but every recipient got deferred
4009 because of some message-specific problem), or if that had happened
4010 previously so that a message retry key exists, add an appropriate item
4011 to the retry chain. Note that if there was a message defer but now there is
4012 a host defer, the message defer record gets deleted. That seems perfectly
4013 reasonable. Also, stop the message from being remembered as waiting
4014 for specific hosts. */
4015
4016 if (message_defer || retry_message_key)
4017 {
4018 int delete_flag = message_defer ? 0 : rf_delete;
4019 if (!retry_message_key)
4020 {
4021 BOOL incl_ip;
4022 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4023 US"retry_include_ip_address", ob->retry_include_ip_address,
4024 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4025 incl_ip = TRUE; /* error; use most-specific retry record */
4026
4027 retry_message_key = incl_ip
4028 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4029 message_id)
4030 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4031 }
4032 retry_add_item(addrlist, retry_message_key,
4033 rf_message | rf_host | delete_flag);
4034 update_waiting = FALSE;
4035 }
4036
4037 /* Any return other than DEFER (that is, OK or ERROR) means that the
4038 addresses have got their final statuses filled in for this host. In the OK
4039 case, see if any of them are deferred. */
4040
4041 if (rc == OK)
4042 for (addr = addrlist; addr; addr = addr->next)
4043 if (addr->transport_return == DEFER)
4044 {
4045 some_deferred = TRUE;
4046 break;
4047 }
4048
4049 /* If no addresses deferred or the result was ERROR, return. We do this for
4050 ERROR because a failing filter set-up or add_headers expansion is likely to
4051 fail for any host we try. */
4052
4053 if (rc == ERROR || (rc == OK && !some_deferred))
4054 {
4055 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4056 return TRUE; /* Each address has its status */
4057 }
4058
4059 /* If the result was DEFER or some individual addresses deferred, let
4060 the loop run to try other hosts with the deferred addresses, except for the
4061 case when we were trying to deliver down an existing channel and failed.
4062 Don't try any other hosts in this case. */
4063
4064 if (continue_hostname) break;
4065
4066 /* If the whole delivery, or some individual addresses, were deferred and
4067 there are more hosts that could be tried, do not count this host towards
4068 the hosts_max_try limit if the age of the message is greater than the
4069 maximum retry time for this host. This means we may try try all hosts,
4070 ignoring the limit, when messages have been around for some time. This is
4071 important because if we don't try all hosts, the address will never time
4072 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4073
4074 if ((rc == DEFER || some_deferred) && nexthost)
4075 {
4076 BOOL timedout;
4077 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4078
4079 if (retry && retry->rules)
4080 {
4081 retry_rule *last_rule;
4082 for (last_rule = retry->rules;
4083 last_rule->next;
4084 last_rule = last_rule->next);
4085 timedout = time(NULL) - received_time > last_rule->timeout;
4086 }
4087 else timedout = TRUE; /* No rule => timed out */
4088
4089 if (timedout)
4090 {
4091 unexpired_hosts_tried--;
4092 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4093 "hosts_max_try (message older than host's retry time)\n");
4094 }
4095 }
4096 } /* End of loop for trying multiple hosts. */
4097
4098 /* This is the end of the loop that repeats iff expired is TRUE and
4099 ob->delay_after_cutoff is FALSE. The second time round we will
4100 try those hosts that haven't been tried since the message arrived. */
4101
4102 DEBUG(D_transport)
4103 {
4104 debug_printf("all IP addresses skipped or deferred at least one address\n");
4105 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4106 debug_printf("retrying IP addresses not tried since message arrived\n");
4107 }
4108 }
4109
4110
4111 /* Get here if all IP addresses are skipped or defer at least one address. In
4112 MUA wrapper mode, this will happen only for connection or other non-message-
4113 specific failures. Force the delivery status for all addresses to FAIL. */
4114
4115 if (mua_wrapper)
4116 {
4117 for (addr = addrlist; addr; addr = addr->next)
4118 addr->transport_return = FAIL;
4119 goto END_TRANSPORT;
4120 }
4121
4122 /* In the normal, non-wrapper case, add a standard message to each deferred
4123 address if there hasn't been an error, that is, if it hasn't actually been
4124 tried this time. The variable "expired" will be FALSE if any deliveries were
4125 actually tried, or if there was at least one host that was not expired. That
4126 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4127 a delivery has been tried, an error code will be set, and the failing of the
4128 message is handled by the retry code later.
4129
4130 If queue_smtp is set, or this transport was called to send a subsequent message
4131 down an existing TCP/IP connection, and something caused the host not to be
4132 found, we end up here, but can detect these cases and handle them specially. */
4133
4134 for (addr = addrlist; addr; addr = addr->next)
4135 {
4136 /* If host is not NULL, it means that we stopped processing the host list
4137 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4138 means we need to behave as if some hosts were skipped because their retry
4139 time had not come. Specifically, this prevents the address from timing out.
4140 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4141 hosts were tried. */
4142
4143 if (host)
4144 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4145 {
4146 DEBUG(D_transport)
4147 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4148 "hosts were tried\n");
4149 }
4150 else
4151 {
4152 DEBUG(D_transport)
4153 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4154 setflag(addr, af_retry_skipped);
4155 }
4156
4157 if (queue_smtp) /* no deliveries attempted */
4158 {
4159 addr->transport_return = DEFER;
4160 addr->basic_errno = 0;
4161 addr->message = US"SMTP delivery explicitly queued";
4162 }
4163
4164 else if ( addr->transport_return == DEFER
4165 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4166 && !addr->message
4167 )
4168 {
4169 addr->basic_errno = ERRNO_HRETRY;
4170 if (continue_hostname)
4171 addr->message = US"no host found for existing SMTP connection";
4172 else if (expired)
4173 {
4174 setflag(addr, af_pass_message); /* This is not a security risk */
4175 addr->message = string_sprintf(
4176 "all hosts%s have been failing for a long time %s",
4177 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4178 ob->delay_after_cutoff
4179 ? US"(and retry time not reached)"
4180 : US"and were last tried after this message arrived");
4181
4182 /* If we are already using fallback hosts, or there are no fallback hosts
4183 defined, convert the result to FAIL to cause a bounce. */
4184
4185 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4186 addr->transport_return = FAIL;
4187 }
4188 else
4189 {
4190 const char * s;
4191 if (hosts_retry == hosts_total)
4192 s = "retry time not reached for any host%s";
4193 else if (hosts_fail == hosts_total)
4194 s = "all host address lookups%s failed permanently";
4195 else if (hosts_defer == hosts_total)
4196 s = "all host address lookups%s failed temporarily";
4197 else if (hosts_serial == hosts_total)
4198 s = "connection limit reached for all hosts%s";
4199 else if (hosts_fail+hosts_defer == hosts_total)
4200 s = "all host address lookups%s failed";
4201 else
4202 s = "some host address lookups failed and retry time "
4203 "not reached for other hosts or connection limit reached%s";
4204
4205 addr->message = string_sprintf(s,
4206 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4207 }
4208 }
4209 }
4210
4211 /* Update the database which keeps information about which messages are waiting
4212 for which hosts to become available. For some message-specific errors, the
4213 update_waiting flag is turned off because we don't want follow-on deliveries in
4214 those cases. If this transport instance is explicitly limited to one message
4215 per connection then follow-on deliveries are not possible and there's no need
4216 to create/update the per-transport wait-<transport_name> database. */
4217
4218 if (update_waiting && tblock->connection_max_messages != 1)
4219 transport_update_waiting(hostlist, tblock->name);
4220
4221 END_TRANSPORT:
4222
4223 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4224
4225 return TRUE; /* Each address has its status */
4226 }
4227
4228 /* vi: aw ai sw=2
4229 */
4230 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.