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Logging: fix errno decodes
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15 #define DELIVER_BUFFER_SIZE 4096
16
17
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
28
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
60 #endif
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
85 #ifdef SUPPORT_TLS
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
88 #endif
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
93 #ifdef SUPPORT_TLS
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 #ifndef DISABLE_PRDR
128 { "hosts_try_prdr", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 #endif
131 #ifdef SUPPORT_TLS
132 { "hosts_verify_avoid_tls", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
134 #endif
135 { "interface", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, interface) },
137 { "keepalive", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, keepalive) },
139 { "lmtp_ignore_quota", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
141 { "max_rcpt", opt_int | opt_public,
142 (void *)offsetof(transport_instance, max_addresses) },
143 { "multi_domain", opt_expand_bool | opt_public,
144 (void *)offsetof(transport_instance, multi_domain) },
145 { "port", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, port) },
147 { "protocol", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, protocol) },
149 { "retry_include_ip_address", opt_expand_bool,
150 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
151 { "serialize_hosts", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
153 { "size_addition", opt_int,
154 (void *)offsetof(smtp_transport_options_block, size_addition) }
155 #ifdef SUPPORT_SOCKS
156 ,{ "socks_proxy", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 #endif
159 #ifdef SUPPORT_TLS
160 ,{ "tls_certificate", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
162 { "tls_crl", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_crl) },
164 { "tls_dh_min_bits", opt_int,
165 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
166 { "tls_privatekey", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
168 { "tls_require_ciphers", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
170 { "tls_sni", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_sni) },
172 { "tls_tempfail_tryclear", opt_bool,
173 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
174 { "tls_try_verify_hosts", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
176 { "tls_verify_cert_hostnames", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
178 { "tls_verify_certificates", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
182 #endif
183 };
184
185 /* Size of the options list. An extern variable has to be used so that its
186 address can appear in the tables drtables.c. */
187
188 int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
190
191 /* Default private options block for the smtp transport. */
192
193 smtp_transport_options_block smtp_transport_option_defaults = {
194 NULL, /* hosts */
195 NULL, /* fallback_hosts */
196 NULL, /* hostlist */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
201 NULL, /* port */
202 US"smtp", /* protocol */
203 NULL, /* DSCP */
204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
207 US"*", /* hosts_try_chunking */
208 #ifdef EXPERIMENTAL_DANE
209 NULL, /* hosts_try_dane */
210 NULL, /* hosts_require_dane */
211 #endif
212 #ifndef DISABLE_PRDR
213 US"*", /* hosts_try_prdr */
214 #endif
215 #ifndef DISABLE_OCSP
216 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
217 NULL, /* hosts_require_ocsp */
218 #endif
219 NULL, /* hosts_require_tls */
220 NULL, /* hosts_avoid_tls */
221 NULL, /* hosts_verify_avoid_tls */
222 NULL, /* hosts_avoid_pipelining */
223 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 5*60, /* command_timeout */
226 5*60, /* connect_timeout; shorter system default overrides */
227 5*60, /* data timeout */
228 10*60, /* final timeout */
229 1024, /* size_addition */
230 5, /* hosts_max_try */
231 50, /* hosts_max_try_hardlimit */
232 TRUE, /* address_retry_include_sender */
233 FALSE, /* allow_localhost */
234 FALSE, /* authenticated_sender_force */
235 FALSE, /* gethostbyname */
236 TRUE, /* dns_qualify_single */
237 FALSE, /* dns_search_parents */
238 { NULL, NULL }, /* dnssec_domains {request,require} */
239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
243 FALSE, /* lmtp_ignore_quota */
244 NULL, /* expand_retry_include_ip_address */
245 TRUE /* retry_include_ip_address */
246 #ifdef SUPPORT_SOCKS
247 ,NULL /* socks_proxy */
248 #endif
249 #ifdef SUPPORT_TLS
250 ,NULL, /* tls_certificate */
251 NULL, /* tls_crl */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
254 NULL, /* tls_sni */
255 US"system", /* tls_verify_certificates */
256 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
257 /* tls_dh_min_bits */
258 TRUE, /* tls_tempfail_tryclear */
259 NULL, /* tls_verify_hosts */
260 US"*", /* tls_try_verify_hosts */
261 US"*" /* tls_verify_cert_hostnames */
262 #endif
263 #ifndef DISABLE_DKIM
264 , {NULL, /* dkim_canon */
265 NULL, /* dkim_domain */
266 NULL, /* dkim_private_key */
267 NULL, /* dkim_selector */
268 NULL, /* dkim_sign_headers */
269 NULL, /* dkim_strict */
270 FALSE} /* dot_stuffed */
271 #endif
272 };
273
274 /* some DSN flags for use later */
275
276 static int rf_list[] = {rf_notify_never, rf_notify_success,
277 rf_notify_failure, rf_notify_delay };
278
279 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
280
281
282
283 /* Local statics */
284
285 static uschar *smtp_command; /* Points to last cmd for error messages */
286 static uschar *mail_command; /* Points to MAIL cmd for error messages */
287 static BOOL update_waiting; /* TRUE to update the "wait" database */
288 static BOOL pipelining_active; /* current transaction is in pipe mode */
289
290
291 /*************************************************
292 * Setup entry point *
293 *************************************************/
294
295 /* This function is called when the transport is about to be used,
296 but before running it in a sub-process. It is used for two things:
297
298 (1) To set the fallback host list in addresses, when delivering.
299 (2) To pass back the interface, port, protocol, and other options, for use
300 during callout verification.
301
302 Arguments:
303 tblock pointer to the transport instance block
304 addrlist list of addresses about to be transported
305 tf if not NULL, pointer to block in which to return options
306 uid the uid that will be set (not used)
307 gid the gid that will be set (not used)
308 errmsg place for error message (not used)
309
310 Returns: OK always (FAIL, DEFER not used)
311 */
312
313 static int
314 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
315 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
316 {
317 smtp_transport_options_block *ob =
318 (smtp_transport_options_block *)(tblock->options_block);
319
320 errmsg = errmsg; /* Keep picky compilers happy */
321 uid = uid;
322 gid = gid;
323
324 /* Pass back options if required. This interface is getting very messy. */
325
326 if (tf != NULL)
327 {
328 tf->interface = ob->interface;
329 tf->port = ob->port;
330 tf->protocol = ob->protocol;
331 tf->hosts = ob->hosts;
332 tf->hosts_override = ob->hosts_override;
333 tf->hosts_randomize = ob->hosts_randomize;
334 tf->gethostbyname = ob->gethostbyname;
335 tf->qualify_single = ob->dns_qualify_single;
336 tf->search_parents = ob->dns_search_parents;
337 tf->helo_data = ob->helo_data;
338 }
339
340 /* Set the fallback host list for all the addresses that don't have fallback
341 host lists, provided that the local host wasn't present in the original host
342 list. */
343
344 if (!testflag(addrlist, af_local_host_removed))
345 {
346 for (; addrlist != NULL; addrlist = addrlist->next)
347 if (addrlist->fallback_hosts == NULL)
348 addrlist->fallback_hosts = ob->fallback_hostlist;
349 }
350
351 return OK;
352 }
353
354
355
356 /*************************************************
357 * Initialization entry point *
358 *************************************************/
359
360 /* Called for each instance, after its options have been read, to
361 enable consistency checks to be done, or anything else that needs
362 to be set up.
363
364 Argument: pointer to the transport instance block
365 Returns: nothing
366 */
367
368 void
369 smtp_transport_init(transport_instance *tblock)
370 {
371 smtp_transport_options_block *ob =
372 (smtp_transport_options_block *)(tblock->options_block);
373
374 /* Retry_use_local_part defaults FALSE if unset */
375
376 if (tblock->retry_use_local_part == TRUE_UNSET)
377 tblock->retry_use_local_part = FALSE;
378
379 /* Set the default port according to the protocol */
380
381 if (ob->port == NULL)
382 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
383 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
384
385 /* Set up the setup entry point, to be called before subprocesses for this
386 transport. */
387
388 tblock->setup = smtp_transport_setup;
389
390 /* Complain if any of the timeouts are zero. */
391
392 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
393 ob->final_timeout <= 0)
394 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
395 "command, data, or final timeout value is zero for %s transport",
396 tblock->name);
397
398 /* If hosts_override is set and there are local hosts, set the global
399 flag that stops verify from showing router hosts. */
400
401 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
402
403 /* If there are any fallback hosts listed, build a chain of host items
404 for them, but do not do any lookups at this time. */
405
406 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
407 }
408
409
410
411
412
413 /*************************************************
414 * Set delivery info into all active addresses *
415 *************************************************/
416
417 /* Only addresses whose status is >= PENDING are relevant. A lesser
418 status means that an address is not currently being processed.
419
420 Arguments:
421 addrlist points to a chain of addresses
422 errno_value to put in each address's errno field
423 msg to put in each address's message field
424 rc to put in each address's transport_return field
425 pass_message if TRUE, set the "pass message" flag in the address
426 host if set, mark addrs as having used this host
427 smtp_greeting from peer
428 helo_response from peer
429
430 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
431 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
432 this particular type of timeout.
433
434 Returns: nothing
435 */
436
437 static void
438 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
439 BOOL pass_message, host_item * host
440 #ifdef EXPERIMENTAL_DSN_INFO
441 , const uschar * smtp_greeting, const uschar * helo_response
442 #endif
443 )
444 {
445 address_item *addr;
446 int orvalue = 0;
447 if (errno_value == ERRNO_CONNECTTIMEOUT)
448 {
449 errno_value = ETIMEDOUT;
450 orvalue = RTEF_CTOUT;
451 }
452 for (addr = addrlist; addr; addr = addr->next)
453 if (addr->transport_return >= PENDING)
454 {
455 addr->basic_errno = errno_value;
456 addr->more_errno |= orvalue;
457 if (msg != NULL)
458 {
459 addr->message = msg;
460 if (pass_message) setflag(addr, af_pass_message);
461 }
462 addr->transport_return = rc;
463 if (host)
464 {
465 addr->host_used = host;
466 #ifdef EXPERIMENTAL_DSN_INFO
467 if (smtp_greeting)
468 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
469 addr->smtp_greeting = smtp_greeting;
470
471 if (helo_response)
472 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
473 addr->helo_response = helo_response;
474 #endif
475 }
476 }
477 }
478
479 static void
480 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
481 BOOL pass_message)
482 {
483 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
484 #ifdef EXPERIMENTAL_DSN_INFO
485 , NULL, NULL
486 #endif
487 );
488 }
489
490
491 /*************************************************
492 * Check an SMTP response *
493 *************************************************/
494
495 /* This function is given an errno code and the SMTP response buffer
496 to analyse, together with the host identification for generating messages. It
497 sets an appropriate message and puts the first digit of the response code into
498 the yield variable. If no response was actually read, a suitable digit is
499 chosen.
500
501 Arguments:
502 host the current host, to get its name for messages
503 errno_value pointer to the errno value
504 more_errno from the top address for use with ERRNO_FILTER_FAIL
505 buffer the SMTP response buffer
506 yield where to put a one-digit SMTP response code
507 message where to put an errror message
508 pass_message set TRUE if message is an SMTP response
509
510 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
511 */
512
513 static BOOL
514 check_response(host_item *host, int *errno_value, int more_errno,
515 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
516 {
517 uschar * pl = pipelining_active ? US"pipelined " : US"";
518
519 *yield = '4'; /* Default setting is to give a temporary error */
520
521 /* Handle response timeout */
522
523 if (*errno_value == ETIMEDOUT)
524 {
525 *message = US string_sprintf("SMTP timeout after %s%s",
526 pl, smtp_command);
527 if (transport_count > 0)
528 *message = US string_sprintf("%s (%d bytes written)", *message,
529 transport_count);
530 return FALSE;
531 }
532
533 /* Handle malformed SMTP response */
534
535 if (*errno_value == ERRNO_SMTPFORMAT)
536 {
537 const uschar *malfresp = string_printing(buffer);
538 while (isspace(*malfresp)) malfresp++;
539 *message = *malfresp == 0
540 ? string_sprintf("Malformed SMTP reply (an empty line) "
541 "in response to %s%s", pl, smtp_command)
542 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
543 pl, smtp_command, malfresp);
544 return FALSE;
545 }
546
547 /* Handle a failed filter process error; can't send QUIT as we mustn't
548 end the DATA. */
549
550 if (*errno_value == ERRNO_FILTER_FAIL)
551 {
552 *message = US string_sprintf("transport filter process failed (%d)%s",
553 more_errno,
554 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
555 return FALSE;
556 }
557
558 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
559 end the DATA. */
560
561 if (*errno_value == ERRNO_CHHEADER_FAIL)
562 {
563 *message =
564 US string_sprintf("failed to expand headers_add or headers_remove: %s",
565 expand_string_message);
566 return FALSE;
567 }
568
569 /* Handle failure to write a complete data block */
570
571 if (*errno_value == ERRNO_WRITEINCOMPLETE)
572 {
573 *message = US string_sprintf("failed to write a data block");
574 return FALSE;
575 }
576
577 #ifdef SUPPORT_I18N
578 /* Handle lack of advertised SMTPUTF8, for international message */
579 if (*errno_value == ERRNO_UTF8_FWD)
580 {
581 *message = US string_sprintf("utf8 support required but not offered for forwarding");
582 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
583 return TRUE;
584 }
585 #endif
586
587 /* Handle error responses from the remote mailer. */
588
589 if (buffer[0] != 0)
590 {
591 const uschar *s = string_printing(buffer);
592 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s);
594 *pass_message = TRUE;
595 *yield = buffer[0];
596 return TRUE;
597 }
598
599 /* No data was read. If there is no errno, this must be the EOF (i.e.
600 connection closed) case, which causes deferral. An explicit connection reset
601 error has the same effect. Otherwise, put the host's identity in the message,
602 leaving the errno value to be interpreted as well. In all cases, we have to
603 assume the connection is now dead. */
604
605 if (*errno_value == 0 || *errno_value == ECONNRESET)
606 {
607 *errno_value = ERRNO_SMTPCLOSED;
608 *message = US string_sprintf("Remote host closed connection "
609 "in response to %s%s", pl, smtp_command);
610 }
611 else *message = US string_sprintf("%s [%s]", host->name, host->address);
612
613 return FALSE;
614 }
615
616
617
618 /*************************************************
619 * Write error message to logs *
620 *************************************************/
621
622 /* This writes to the main log and to the message log.
623
624 Arguments:
625 addr the address item containing error information
626 host the current host
627
628 Returns: nothing
629 */
630
631 static void
632 write_logs(address_item *addr, host_item *host)
633 {
634 uschar * message = LOGGING(outgoing_port)
635 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
636 host->port == PORT_NONE ? 25 : host->port)
637 : string_sprintf("H=%s [%s]", host->name, host->address);
638
639 if (addr->message)
640 {
641 message = string_sprintf("%s: %s", message, addr->message);
642 if (addr->basic_errno > 0)
643 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
644 log_write(0, LOG_MAIN, "%s", message);
645 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
646 }
647 else
648 {
649 const uschar * s = exim_errstr(addr->basic_errno);
650 log_write(0, LOG_MAIN, "%s %s", message, s);
651 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
652 }
653 }
654
655 static void
656 msglog_line(host_item * host, uschar * message)
657 {
658 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
659 host->name, host->address, message);
660 }
661
662
663
664 #ifndef DISABLE_EVENT
665 /*************************************************
666 * Post-defer action *
667 *************************************************/
668
669 /* This expands an arbitrary per-transport string.
670 It might, for example, be used to write to the database log.
671
672 Arguments:
673 addr the address item containing error information
674 host the current host
675
676 Returns: nothing
677 */
678
679 static void
680 deferred_event_raise(address_item *addr, host_item *host)
681 {
682 uschar * action = addr->transport->event_action;
683 const uschar * save_domain;
684 uschar * save_local;
685
686 if (!action)
687 return;
688
689 save_domain = deliver_domain;
690 save_local = deliver_localpart;
691
692 /*XXX would ip & port already be set up? */
693 deliver_host_address = string_copy(host->address);
694 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
695 event_defer_errno = addr->basic_errno;
696
697 router_name = addr->router->name;
698 transport_name = addr->transport->name;
699 deliver_domain = addr->domain;
700 deliver_localpart = addr->local_part;
701
702 (void) event_raise(action, US"msg:host:defer",
703 addr->message
704 ? addr->basic_errno > 0
705 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
706 : string_copy(addr->message)
707 : addr->basic_errno > 0
708 ? string_copy(US strerror(addr->basic_errno))
709 : NULL);
710
711 deliver_localpart = save_local;
712 deliver_domain = save_domain;
713 router_name = transport_name = NULL;
714 }
715 #endif
716
717 /*************************************************
718 * Synchronize SMTP responses *
719 *************************************************/
720
721 /* This function is called from smtp_deliver() to receive SMTP responses from
722 the server, and match them up with the commands to which they relate. When
723 PIPELINING is not in use, this function is called after every command, and is
724 therefore somewhat over-engineered, but it is simpler to use a single scheme
725 that works both with and without PIPELINING instead of having two separate sets
726 of code.
727
728 The set of commands that are buffered up with pipelining may start with MAIL
729 and may end with DATA; in between are RCPT commands that correspond to the
730 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
731 etc.) are never buffered.
732
733 Errors after MAIL or DATA abort the whole process leaving the response in the
734 buffer. After MAIL, pending responses are flushed, and the original command is
735 re-instated in big_buffer for error messages. For RCPT commands, the remote is
736 permitted to reject some recipient addresses while accepting others. However
737 certain errors clearly abort the whole process. Set the value in
738 transport_return to PENDING_OK if the address is accepted. If there is a
739 subsequent general error, it will get reset accordingly. If not, it will get
740 converted to OK at the end.
741
742 Arguments:
743 addrlist the complete address list
744 include_affixes TRUE if affixes include in RCPT
745 sync_addr ptr to the ptr of the one to start scanning at (updated)
746 host the host we are connected to
747 count the number of responses to read
748 address_retry_
749 include_sender true if 4xx retry is to include the sender it its key
750 pending_MAIL true if the first response is for MAIL
751 pending_DATA 0 if last command sent was not DATA
752 +1 if previously had a good recipient
753 -1 if not previously had a good recipient
754 inblock incoming SMTP block
755 timeout timeout value
756 buffer buffer for reading response
757 buffsize size of buffer
758
759 Returns: 3 if at least one address had 2xx and one had 5xx
760 2 if at least one address had 5xx but none had 2xx
761 1 if at least one host had a 2xx response, but none had 5xx
762 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
763 -1 timeout while reading RCPT response
764 -2 I/O or other non-response error for RCPT
765 -3 DATA or MAIL failed - errno and buffer set
766 */
767
768 static int
769 sync_responses(address_item *addrlist, BOOL include_affixes,
770 address_item **sync_addr, host_item *host, int count,
771 BOOL address_retry_include_sender, BOOL pending_MAIL,
772 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
773 int buffsize)
774 {
775 address_item *addr = *sync_addr;
776 int yield = 0;
777
778 /* Handle the response for a MAIL command. On error, reinstate the original
779 command in big_buffer for error message use, and flush any further pending
780 responses before returning, except after I/O errors and timeouts. */
781
782 if (pending_MAIL)
783 {
784 count--;
785 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
786 {
787 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
788 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
789 if (errno == 0 && buffer[0] != 0)
790 {
791 uschar flushbuffer[4096];
792 int save_errno = 0;
793 if (buffer[0] == '4')
794 {
795 save_errno = ERRNO_MAIL4XX;
796 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
797 }
798 while (count-- > 0)
799 {
800 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
801 '2', timeout)
802 && (errno != 0 || flushbuffer[0] == 0))
803 break;
804 }
805 errno = save_errno;
806 }
807
808 if (pending_DATA) count--; /* Number of RCPT responses to come */
809 while (count-- > 0) /* Mark any pending addrs with the host used */
810 {
811 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
812 addr->host_used = host;
813 addr = addr->next;
814 }
815 return -3;
816 }
817 }
818
819 if (pending_DATA) count--; /* Number of RCPT responses to come */
820
821 /* Read and handle the required number of RCPT responses, matching each one up
822 with an address by scanning for the next address whose status is PENDING_DEFER.
823 */
824
825 while (count-- > 0)
826 {
827 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
828
829 /* The address was accepted */
830 addr->host_used = host;
831
832 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
833 {
834 yield |= 1;
835 addr->transport_return = PENDING_OK;
836
837 /* If af_dr_retry_exists is set, there was a routing delay on this address;
838 ensure that any address-specific retry record is expunged. We do this both
839 for the basic key and for the version that also includes the sender. */
840
841 if (testflag(addr, af_dr_retry_exists))
842 {
843 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
844 sender_address);
845 retry_add_item(addr, altkey, rf_delete);
846 retry_add_item(addr, addr->address_retry_key, rf_delete);
847 }
848 }
849
850 /* Timeout while reading the response */
851
852 else if (errno == ETIMEDOUT)
853 {
854 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
855 transport_rcpt_address(addr, include_affixes));
856 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
857 retry_add_item(addr, addr->address_retry_key, 0);
858 update_waiting = FALSE;
859 return -1;
860 }
861
862 /* Handle other errors in obtaining an SMTP response by returning -1. This
863 will cause all the addresses to be deferred. Restore the SMTP command in
864 big_buffer for which we are checking the response, so the error message
865 makes sense. */
866
867 else if (errno != 0 || buffer[0] == 0)
868 {
869 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
870 transport_rcpt_address(addr, include_affixes));
871 return -2;
872 }
873
874 /* Handle SMTP permanent and temporary response codes. */
875
876 else
877 {
878 addr->message =
879 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
880 "%s", transport_rcpt_address(addr, include_affixes),
881 string_printing(buffer));
882 setflag(addr, af_pass_message);
883 msglog_line(host, addr->message);
884
885 /* The response was 5xx */
886
887 if (buffer[0] == '5')
888 {
889 addr->transport_return = FAIL;
890 yield |= 2;
891 }
892
893 /* The response was 4xx */
894
895 else
896 {
897 addr->transport_return = DEFER;
898 addr->basic_errno = ERRNO_RCPT4XX;
899 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
900
901 #ifndef DISABLE_EVENT
902 event_defer_errno = addr->more_errno;
903 msg_event_raise(US"msg:rcpt:host:defer", addr);
904 #endif
905
906 /* Log temporary errors if there are more hosts to be tried.
907 If not, log this last one in the == line. */
908
909 if (host->next)
910 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
911
912 #ifndef DISABLE_EVENT
913 else
914 msg_event_raise(US"msg:rcpt:defer", addr);
915 #endif
916
917 /* Do not put this message on the list of those waiting for specific
918 hosts, as otherwise it is likely to be tried too often. */
919
920 update_waiting = FALSE;
921
922 /* Add a retry item for the address so that it doesn't get tried again
923 too soon. If address_retry_include_sender is true, add the sender address
924 to the retry key. */
925
926 if (address_retry_include_sender)
927 {
928 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
929 sender_address);
930 retry_add_item(addr, altkey, 0);
931 }
932 else retry_add_item(addr, addr->address_retry_key, 0);
933 }
934 }
935 } /* Loop for next RCPT response */
936
937 /* Update where to start at for the next block of responses, unless we
938 have already handled all the addresses. */
939
940 if (addr != NULL) *sync_addr = addr->next;
941
942 /* Handle a response to DATA. If we have not had any good recipients, either
943 previously or in this block, the response is ignored. */
944
945 if (pending_DATA != 0 &&
946 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
947 {
948 int code;
949 uschar *msg;
950 BOOL pass_message;
951 if (pending_DATA > 0 || (yield & 1) != 0)
952 {
953 if (errno == 0 && buffer[0] == '4')
954 {
955 errno = ERRNO_DATA4XX;
956 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
957 }
958 return -3;
959 }
960 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
961 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
962 "is in use and there were no good recipients\n", msg);
963 }
964
965 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
966 present) received 3xx. If any RCPTs were handled and yielded anything other
967 than 4xx, yield will be set non-zero. */
968
969 return yield;
970 }
971
972
973
974 /* Do the client side of smtp-level authentication */
975 /*
976 Arguments:
977 buffer EHLO response from server (gets overwritten)
978 addrlist chain of potential addresses to deliver
979 host host to deliver to
980 ob transport options
981 ibp, obp comms channel control blocks
982
983 Returns:
984 OK Success, or failed (but not required): global "smtp_authenticated" set
985 DEFER Failed authentication (and was required)
986 ERROR Internal problem
987
988 FAIL_SEND Failed communications - transmit
989 FAIL - response
990 */
991
992 int
993 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
994 smtp_transport_options_block *ob, BOOL is_esmtp,
995 smtp_inblock *ibp, smtp_outblock *obp)
996 {
997 int require_auth;
998 uschar *fail_reason = US"server did not advertise AUTH support";
999
1000 smtp_authenticated = FALSE;
1001 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1002 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1003
1004 if (is_esmtp && !regex_AUTH) regex_AUTH =
1005 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1006 FALSE, TRUE);
1007
1008 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1009 {
1010 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1011 expand_nmax = -1; /* reset */
1012
1013 /* Must not do this check until after we have saved the result of the
1014 regex match above. */
1015
1016 if (require_auth == OK ||
1017 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1018 {
1019 auth_instance *au;
1020 fail_reason = US"no common mechanisms were found";
1021
1022 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1023
1024 /* Scan the configured authenticators looking for one which is configured
1025 for use as a client, which is not suppressed by client_condition, and
1026 whose name matches an authentication mechanism supported by the server.
1027 If one is found, attempt to authenticate by calling its client function.
1028 */
1029
1030 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1031 {
1032 uschar *p = names;
1033 if (!au->client ||
1034 (au->client_condition != NULL &&
1035 !expand_check_condition(au->client_condition, au->name,
1036 US"client authenticator")))
1037 {
1038 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1039 au->name,
1040 (au->client)? "client_condition is false" :
1041 "not configured as a client");
1042 continue;
1043 }
1044
1045 /* Loop to scan supported server mechanisms */
1046
1047 while (*p != 0)
1048 {
1049 int rc;
1050 int len = Ustrlen(au->public_name);
1051 while (isspace(*p)) p++;
1052
1053 if (strncmpic(au->public_name, p, len) != 0 ||
1054 (p[len] != 0 && !isspace(p[len])))
1055 {
1056 while (*p != 0 && !isspace(*p)) p++;
1057 continue;
1058 }
1059
1060 /* Found data for a listed mechanism. Call its client entry. Set
1061 a flag in the outblock so that data is overwritten after sending so
1062 that reflections don't show it. */
1063
1064 fail_reason = US"authentication attempt(s) failed";
1065 obp->authenticating = TRUE;
1066 rc = (au->info->clientcode)(au, ibp, obp,
1067 ob->command_timeout, buffer, bufsize);
1068 obp->authenticating = FALSE;
1069 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1070 au->name, rc);
1071
1072 /* A temporary authentication failure must hold up delivery to
1073 this host. After a permanent authentication failure, we carry on
1074 to try other authentication methods. If all fail hard, try to
1075 deliver the message unauthenticated unless require_auth was set. */
1076
1077 switch(rc)
1078 {
1079 case OK:
1080 smtp_authenticated = TRUE; /* stops the outer loop */
1081 client_authenticator = au->name;
1082 if (au->set_client_id != NULL)
1083 client_authenticated_id = expand_string(au->set_client_id);
1084 break;
1085
1086 /* Failure after writing a command */
1087
1088 case FAIL_SEND:
1089 return FAIL_SEND;
1090
1091 /* Failure after reading a response */
1092
1093 case FAIL:
1094 if (errno != 0 || buffer[0] != '5') return FAIL;
1095 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1096 au->name, host->name, host->address, buffer);
1097 break;
1098
1099 /* Failure by some other means. In effect, the authenticator
1100 decided it wasn't prepared to handle this case. Typically this
1101 is the result of "fail" in an expansion string. Do we need to
1102 log anything here? Feb 2006: a message is now put in the buffer
1103 if logging is required. */
1104
1105 case CANCELLED:
1106 if (*buffer != 0)
1107 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1108 "authentication H=%s [%s] %s", au->name, host->name,
1109 host->address, buffer);
1110 break;
1111
1112 /* Internal problem, message in buffer. */
1113
1114 case ERROR:
1115 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1116 DEFER, FALSE);
1117 return ERROR;
1118 }
1119
1120 break; /* If not authenticated, try next authenticator */
1121 } /* Loop for scanning supported server mechanisms */
1122 } /* Loop for further authenticators */
1123 }
1124 }
1125
1126 /* If we haven't authenticated, but are required to, give up. */
1127
1128 if (require_auth == OK && !smtp_authenticated)
1129 {
1130 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1131 string_sprintf("authentication required but %s", fail_reason), DEFER,
1132 FALSE);
1133 return DEFER;
1134 }
1135
1136 return OK;
1137 }
1138
1139
1140 /* Construct AUTH appendix string for MAIL TO */
1141 /*
1142 Arguments
1143 buffer to build string
1144 addrlist chain of potential addresses to deliver
1145 ob transport options
1146
1147 Globals smtp_authenticated
1148 client_authenticated_sender
1149 Return True on error, otherwise buffer has (possibly empty) terminated string
1150 */
1151
1152 BOOL
1153 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1154 smtp_transport_options_block *ob)
1155 {
1156 uschar *local_authenticated_sender = authenticated_sender;
1157
1158 #ifdef notdef
1159 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1160 #endif
1161
1162 if (ob->authenticated_sender != NULL)
1163 {
1164 uschar *new = expand_string(ob->authenticated_sender);
1165 if (new == NULL)
1166 {
1167 if (!expand_string_forcedfail)
1168 {
1169 uschar *message = string_sprintf("failed to expand "
1170 "authenticated_sender: %s", expand_string_message);
1171 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1172 return TRUE;
1173 }
1174 }
1175 else if (new[0] != 0) local_authenticated_sender = new;
1176 }
1177
1178 /* Add the authenticated sender address if present */
1179
1180 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1181 local_authenticated_sender != NULL)
1182 {
1183 string_format(buffer, bufsize, " AUTH=%s",
1184 auth_xtextencode(local_authenticated_sender,
1185 Ustrlen(local_authenticated_sender)));
1186 client_authenticated_sender = string_copy(local_authenticated_sender);
1187 }
1188 else
1189 *buffer= 0;
1190
1191 return FALSE;
1192 }
1193
1194
1195
1196 #ifdef EXPERIMENTAL_DANE
1197 /* Lookup TLSA record for host/port.
1198 Return: OK success with dnssec; DANE mode
1199 DEFER Do not use this host now, may retry later
1200 FAIL_FORCED No TLSA record; DANE not usable
1201 FAIL Do not use this connection
1202 */
1203
1204 int
1205 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1206 {
1207 /* move this out to host.c given the similarity to dns_lookup() ? */
1208 uschar buffer[300];
1209 const uschar * fullname = buffer;
1210
1211 /* TLSA lookup string */
1212 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1213
1214 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1215 {
1216 case DNS_SUCCEED:
1217 if (!dns_is_secure(dnsa))
1218 {
1219 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1220 return DEFER;
1221 }
1222 return OK;
1223
1224 case DNS_AGAIN:
1225 return DEFER; /* just defer this TLS'd conn */
1226
1227 case DNS_NODATA: /* no TLSA RR for this lookup */
1228 case DNS_NOMATCH: /* no records at all for this lookup */
1229 return dane_required ? FAIL : FAIL_FORCED;
1230
1231 default:
1232 case DNS_FAIL:
1233 return dane_required ? FAIL : DEFER;
1234 }
1235 }
1236 #endif
1237
1238
1239
1240 typedef struct smtp_compare_s
1241 {
1242 uschar *current_sender_address;
1243 struct transport_instance *tblock;
1244 } smtp_compare_t;
1245
1246 /*
1247 Create a unique string that identifies this message, it is based on
1248 sender_address, helo_data and tls_certificate if enabled. */
1249
1250 static uschar *
1251 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1252 {
1253 address_item * addr1;
1254 uschar * if1 = US"";
1255 uschar * helo1 = US"";
1256 #ifdef SUPPORT_TLS
1257 uschar * tlsc1 = US"";
1258 #endif
1259 uschar * save_sender_address = sender_address;
1260 uschar * local_identity = NULL;
1261 smtp_transport_options_block * ob =
1262 (smtp_transport_options_block *)tblock->options_block;
1263
1264 sender_address = sender;
1265
1266 addr1 = deliver_make_addr (sender, TRUE);
1267 deliver_set_expansions(addr1);
1268
1269 if (ob->interface)
1270 if1 = expand_string(ob->interface);
1271
1272 if (ob->helo_data)
1273 helo1 = expand_string(ob->helo_data);
1274
1275 #ifdef SUPPORT_TLS
1276 if (ob->tls_certificate)
1277 tlsc1 = expand_string(ob->tls_certificate);
1278 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1279 #else
1280 local_identity = string_sprintf ("%s^%s", if1, helo1);
1281 #endif
1282
1283 deliver_set_expansions(NULL);
1284 sender_address = save_sender_address;
1285
1286 return local_identity;
1287 }
1288
1289
1290
1291 /* This routine is a callback that is called from transport_check_waiting.
1292 This function will evaluate the incoming message versus the previous
1293 message. If the incoming message is using a different local identity then
1294 we will veto this new message. */
1295
1296 static BOOL
1297 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1298 {
1299 uschar * message_local_identity,
1300 * current_local_identity,
1301 * new_sender_address;
1302
1303 current_local_identity =
1304 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1305
1306 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1307 return 0;
1308
1309 message_local_identity =
1310 smtp_local_identity(new_sender_address, s_compare->tblock);
1311
1312 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1313 }
1314
1315
1316
1317 uschar
1318 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1319 {
1320 #ifdef SUPPORT_TLS
1321 if ( checks & PEER_OFFERED_TLS
1322 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1323 checks &= ~PEER_OFFERED_TLS;
1324 #endif
1325
1326 if ( checks & PEER_OFFERED_IGNQ
1327 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1328 PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_IGNQ;
1330
1331 if ( checks & PEER_OFFERED_CHUNKING
1332 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_CHUNKING;
1334
1335 #ifndef DISABLE_PRDR
1336 if ( checks & PEER_OFFERED_PRDR
1337 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_PRDR;
1339 #endif
1340
1341 #ifdef SUPPORT_I18N
1342 if ( checks & PEER_OFFERED_UTF8
1343 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_UTF8;
1345 #endif
1346
1347 if ( checks & PEER_OFFERED_DSN
1348 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_DSN;
1350
1351 if ( checks & PEER_OFFERED_PIPE
1352 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1353 PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PIPE;
1355
1356 if ( checks & PEER_OFFERED_SIZE
1357 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~PEER_OFFERED_SIZE;
1359
1360 return checks;
1361 }
1362
1363
1364
1365 /* Callback for emitting a BDAT data chunk header.
1366
1367 If given a nonzero size, first flush any buffered SMTP commands
1368 then emit the command.
1369
1370 Reap previous SMTP command responses if requested.
1371 Reap one SMTP command response if requested.
1372
1373 Returns: OK or ERROR
1374 */
1375
1376 static int
1377 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1378 unsigned chunk_size, unsigned flags)
1379 {
1380 smtp_transport_options_block * ob =
1381 (smtp_transport_options_block *)(tctx->tblock->options_block);
1382 int cmd_count = 0;
1383 int prev_cmd_count;
1384 uschar * buffer = tctx->buffer;
1385
1386
1387 /* Write SMTP chunk header command */
1388
1389 if (chunk_size > 0)
1390 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1391 chunk_size,
1392 flags & tc_chunk_last ? " LAST" : "")
1393 ) < 0) return ERROR;
1394
1395 prev_cmd_count = cmd_count += tctx->cmd_count;
1396
1397 /* Reap responses for any previous, but not one we just emitted */
1398
1399 if (chunk_size > 0)
1400 prev_cmd_count--;
1401 if (tctx->pending_BDAT)
1402 prev_cmd_count--;
1403
1404 if (flags & tc_reap_prev && prev_cmd_count > 0)
1405 {
1406 DEBUG(D_transport) debug_printf("look for %d responses"
1407 " for previous pipelined cmds\n", prev_cmd_count);
1408
1409 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1410 tctx->sync_addr, tctx->host, prev_cmd_count,
1411 ob->address_retry_include_sender,
1412 tctx->pending_MAIL, 0,
1413 tctx->inblock,
1414 ob->command_timeout,
1415 buffer, DELIVER_BUFFER_SIZE))
1416 {
1417 case 1: /* 2xx (only) => OK */
1418 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1419 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1420 case 0: break; /* No 2xx or 5xx, but no probs */
1421
1422 case -1: /* Timeout on RCPT */
1423 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1424 }
1425 cmd_count = 1;
1426 if (!tctx->pending_BDAT)
1427 pipelining_active = FALSE;
1428 }
1429
1430 /* Reap response for an outstanding BDAT */
1431
1432 if (tctx->pending_BDAT)
1433 {
1434 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1435
1436 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1437 ob->command_timeout))
1438 {
1439 if (errno == 0 && buffer[0] == '4')
1440 {
1441 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1442 tctx->first_addr->more_errno |=
1443 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1444 }
1445 return ERROR;
1446 }
1447 cmd_count--;
1448 tctx->pending_BDAT = FALSE;
1449 pipelining_active = FALSE;
1450 }
1451 else if (chunk_size > 0)
1452 tctx->pending_BDAT = TRUE;
1453
1454
1455 tctx->cmd_count = cmd_count;
1456 return OK;
1457 }
1458
1459
1460
1461 /*************************************************
1462 * Deliver address list to given host *
1463 *************************************************/
1464
1465 /* If continue_hostname is not null, we get here only when continuing to
1466 deliver down an existing channel. The channel was passed as the standard
1467 input. TLS is never active on a passed channel; the previous process always
1468 closes it down before passing the connection on.
1469
1470 Otherwise, we have to make a connection to the remote host, and do the
1471 initial protocol exchange.
1472
1473 When running as an MUA wrapper, if the sender or any recipient is rejected,
1474 temporarily or permanently, we force failure for all recipients.
1475
1476 Arguments:
1477 addrlist chain of potential addresses to deliver; only those whose
1478 transport_return field is set to PENDING_DEFER are currently
1479 being processed; others should be skipped - they have either
1480 been delivered to an earlier host or IP address, or been
1481 failed by one of them.
1482 host host to deliver to
1483 host_af AF_INET or AF_INET6
1484 port default TCP/IP port to use, in host byte order
1485 interface interface to bind to, or NULL
1486 tblock transport instance block
1487 message_defer set TRUE if yield is OK, but all addresses were deferred
1488 because of a non-recipient, non-host failure, that is, a
1489 4xx response to MAIL FROM, DATA, or ".". This is a defer
1490 that is specific to the message.
1491 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1492 a second attempt after TLS initialization fails
1493
1494 Returns: OK - the connection was made and the delivery attempted;
1495 the result for each address is in its data block.
1496 DEFER - the connection could not be made, or something failed
1497 while setting up the SMTP session, or there was a
1498 non-message-specific error, such as a timeout.
1499 ERROR - a filter command is specified for this transport,
1500 and there was a problem setting it up; OR helo_data
1501 or add_headers or authenticated_sender is specified
1502 for this transport, and the string failed to expand
1503 */
1504
1505 static int
1506 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1507 uschar *interface, transport_instance *tblock,
1508 BOOL *message_defer, BOOL suppress_tls)
1509 {
1510 address_item *addr;
1511 address_item *sync_addr;
1512 address_item *first_addr = addrlist;
1513 int yield = OK;
1514 int address_count;
1515 int save_errno;
1516 int rc;
1517 time_t start_delivery_time = time(NULL);
1518 smtp_transport_options_block *ob =
1519 (smtp_transport_options_block *)(tblock->options_block);
1520 struct lflags {
1521 BOOL lmtp:1;
1522 BOOL smtps:1;
1523 BOOL ok:1;
1524 BOOL send_rset:1;
1525 BOOL send_quit:1;
1526 BOOL setting_up:1;
1527 BOOL esmtp:1;
1528 BOOL esmtp_sent:1;
1529 BOOL pending_MAIL:1;
1530 #ifndef DISABLE_PRDR
1531 BOOL prdr_active:1;
1532 #endif
1533 #ifdef SUPPORT_I18N
1534 BOOL utf8_needed:1;
1535 #endif
1536 BOOL dsn_all_lasthop:1;
1537 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1538 BOOL dane:1;
1539 BOOL dane_required:1;
1540 #endif
1541 } lflags;
1542
1543 BOOL pass_message = FALSE;
1544 BOOL completed_address = FALSE;
1545 uschar peer_offered = 0;
1546 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1547 dns_answer tlsa_dnsa;
1548 #endif
1549 smtp_inblock inblock;
1550 smtp_outblock outblock;
1551 int max_rcpt = tblock->max_addresses;
1552 uschar *igquotstr = US"";
1553
1554 #ifdef EXPERIMENTAL_DSN_INFO
1555 uschar *smtp_greeting = NULL;
1556 uschar *helo_response = NULL;
1557 #endif
1558 uschar *helo_data = NULL;
1559
1560 uschar *message = NULL;
1561 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1562 uschar *p;
1563 uschar buffer[DELIVER_BUFFER_SIZE];
1564 uschar inbuffer[4096];
1565 uschar outbuffer[4096];
1566
1567 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1568
1569 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1570 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1571 lflags.ok = FALSE;
1572 lflags.send_rset = TRUE;
1573 lflags.send_quit = TRUE;
1574 lflags.setting_up = TRUE;
1575 lflags.esmtp = TRUE;
1576 lflags.esmtp_sent = FALSE;
1577 lflags.pending_MAIL;
1578 #ifndef DISABLE_PRDR
1579 lflags.prdr_active;
1580 #endif
1581 #ifdef SUPPORT_I18N
1582 lflags.utf8_needed = FALSE;
1583 #endif
1584 lflags.dsn_all_lasthop = TRUE;
1585 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1586 lflags.dane = FALSE;
1587 lflags.dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1588 #endif
1589
1590 *message_defer = FALSE;
1591 smtp_command = US"initial connection";
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 = smtp_read_response(&inblock, buffer, sizeof(buffer),
1713 '2', ob->command_timeout);
1714 #ifdef EXPERIMENTAL_DSN_INFO
1715 smtp_greeting = string_copy(buffer);
1716 #endif
1717 if (!good_response) goto RESPONSE_FAILED;
1718
1719 #ifndef DISABLE_EVENT
1720 {
1721 uschar * s;
1722 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1723 : host->dnssec==DS_NO ? US"no" : NULL;
1724 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1725 if (s)
1726 {
1727 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1728 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1729 DEFER, FALSE);
1730 yield = DEFER;
1731 goto SEND_QUIT;
1732 }
1733 }
1734 #endif
1735
1736 /* Now check if the helo_data expansion went well, and sign off cleanly if
1737 it didn't. */
1738
1739 if (helo_data == NULL)
1740 {
1741 uschar *message = string_sprintf("failed to expand helo_data: %s",
1742 expand_string_message);
1743 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1744 yield = DEFER;
1745 goto SEND_QUIT;
1746 }
1747 }
1748
1749 /** Debugging without sending a message
1750 addrlist->transport_return = DEFER;
1751 goto SEND_QUIT;
1752 **/
1753
1754 /* Errors that occur after this point follow an SMTP command, which is
1755 left in big_buffer by smtp_write_command() for use in error messages. */
1756
1757 smtp_command = big_buffer;
1758
1759 /* Tell the remote who we are...
1760
1761 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1762 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1763 greeting is of this form. The assumption was that the far end supports it
1764 properly... but experience shows that there are some that give 5xx responses,
1765 even though the banner includes "ESMTP" (there's a bloody-minded one that
1766 says "ESMTP not spoken here"). Cope with that case.
1767
1768 September 2000: Time has passed, and it seems reasonable now to always send
1769 EHLO at the start. It is also convenient to make the change while installing
1770 the TLS stuff.
1771
1772 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1773 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1774 would be no way to send out the mails, so there is now a host list
1775 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1776 PIPELINING problem as well. Maybe it can also be useful to cure other
1777 problems with broken servers.
1778
1779 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1780 Then somebody tried it with a Microsoft mailer... It seems that all other
1781 mailers use upper case for some reason (the RFC is quite clear about case
1782 independence) so, for peace of mind, I gave in. */
1783
1784 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1785
1786 /* Alas; be careful, since this goto is not an error-out, so conceivably
1787 we might set data between here and the target which we assume to exist
1788 and be usable. I can see this coming back to bite us. */
1789 #ifdef SUPPORT_TLS
1790 if (lflags.smtps)
1791 {
1792 smtp_peer_options |= PEER_OFFERED_TLS;
1793 suppress_tls = FALSE;
1794 ob->tls_tempfail_tryclear = FALSE;
1795 smtp_command = US"SSL-on-connect";
1796 goto TLS_NEGOTIATE;
1797 }
1798 #endif
1799
1800 if (lflags.esmtp)
1801 {
1802 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1803 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1804 goto SEND_FAILED;
1805 lflags.esmtp_sent = TRUE;
1806 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1807 ob->command_timeout))
1808 {
1809 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1810 {
1811 #ifdef EXPERIMENTAL_DSN_INFO
1812 helo_response = string_copy(buffer);
1813 #endif
1814 goto RESPONSE_FAILED;
1815 }
1816 lflags.esmtp = FALSE;
1817 }
1818 #ifdef EXPERIMENTAL_DSN_INFO
1819 helo_response = string_copy(buffer);
1820 #endif
1821 }
1822 else
1823 DEBUG(D_transport)
1824 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1825
1826 if (!lflags.esmtp)
1827 {
1828 BOOL good_response;
1829 int n = sizeof(buffer);
1830 uschar * rsp = buffer;
1831
1832 if (lflags.esmtp_sent && (n = Ustrlen(buffer)) < sizeof(buffer)/2)
1833 { rsp = buffer + n + 1; n = sizeof(buffer) - n; }
1834
1835 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1836 goto SEND_FAILED;
1837 good_response = smtp_read_response(&inblock, rsp, n,
1838 '2', ob->command_timeout);
1839 #ifdef EXPERIMENTAL_DSN_INFO
1840 helo_response = string_copy(rsp);
1841 #endif
1842 if (!good_response)
1843 {
1844 /* Handle special logging for a closed connection after HELO
1845 when had previously sent EHLO */
1846
1847 if (rsp != buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1848 {
1849 message = NULL;
1850 lflags.send_quit = FALSE;
1851 save_errno = ERRNO_SMTPCLOSED;
1852 message = string_sprintf("Remote host closed connection "
1853 "in response to %s (EHLO response was: %s)",
1854 smtp_command, buffer);
1855 goto FAILED;
1856 }
1857 Ustrncpy(buffer, rsp, sizeof(buffer)/2);
1858 goto RESPONSE_FAILED;
1859 }
1860 }
1861
1862 peer_offered = smtp_peer_options = 0;
1863
1864 if (lflags.esmtp || lflags.lmtp)
1865 {
1866 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1867 PEER_OFFERED_TLS /* others checked later */
1868 );
1869
1870 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1871
1872 #ifdef SUPPORT_TLS
1873 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1874 #endif
1875 }
1876 }
1877
1878 /* For continuing deliveries down the same channel, the socket is the standard
1879 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1880 below). Set up the pointer to where subsequent commands will be left, for
1881 error messages. Note that smtp_peer_options will have been
1882 set from the command line if they were set in the process that passed the
1883 connection on. */
1884
1885 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1886 as the contine goes via transport_pass_socket() and doublefork and exec.
1887 It does not wait. Unclear how we keep separate host's responses
1888 separate - we could match up by host ip+port as a bodge. */
1889
1890 else
1891 {
1892 inblock.sock = outblock.sock = fileno(stdin);
1893 smtp_command = big_buffer;
1894 host->port = port; /* Record the port that was used */
1895 }
1896
1897 /* If TLS is available on this connection, whether continued or not, attempt to
1898 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1899 send another EHLO - the server may give a different answer in secure mode. We
1900 use a separate buffer for reading the response to STARTTLS so that if it is
1901 negative, the original EHLO data is available for subsequent analysis, should
1902 the client not be required to use TLS. If the response is bad, copy the buffer
1903 for error analysis. */
1904
1905 #ifdef SUPPORT_TLS
1906 if ( smtp_peer_options & PEER_OFFERED_TLS
1907 && !suppress_tls
1908 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1909 {
1910 uschar buffer2[4096];
1911 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1912 goto SEND_FAILED;
1913
1914 /* If there is an I/O error, transmission of this message is deferred. If
1915 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1916 false, we also defer. However, if there is a temporary rejection of STARTTLS
1917 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1918 STARTTLS, we carry on. This means we will try to send the message in clear,
1919 unless the host is in hosts_require_tls (tested below). */
1920
1921 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1922 ob->command_timeout))
1923 {
1924 if ( errno != 0
1925 || buffer2[0] == 0
1926 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1927 )
1928 {
1929 Ustrncpy(buffer, buffer2, sizeof(buffer));
1930 goto RESPONSE_FAILED;
1931 }
1932 }
1933
1934 /* STARTTLS accepted: try to negotiate a TLS session. */
1935
1936 else
1937 TLS_NEGOTIATE:
1938 {
1939 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1940 # ifdef EXPERIMENTAL_DANE
1941 , lflags.dane ? &tlsa_dnsa : NULL
1942 # endif
1943 );
1944
1945 /* TLS negotiation failed; give an error. From outside, this function may
1946 be called again to try in clear on a new connection, if the options permit
1947 it for this host. */
1948
1949 if (rc != OK)
1950 {
1951 # ifdef EXPERIMENTAL_DANE
1952 if (rc == DEFER && lflags.dane)
1953 {
1954 log_write(0, LOG_MAIN,
1955 "DANE attempt failed; no TLS connection to %s [%s]",
1956 host->name, host->address);
1957 }
1958 # endif
1959
1960 save_errno = ERRNO_TLSFAILURE;
1961 message = US"failure while setting up TLS session";
1962 lflags.send_quit = FALSE;
1963 goto TLS_FAILED;
1964 }
1965
1966 /* TLS session is set up */
1967
1968 smtp_peer_options_wrap = smtp_peer_options;
1969 for (addr = addrlist; addr; addr = addr->next)
1970 if (addr->transport_return == PENDING_DEFER)
1971 {
1972 addr->cipher = tls_out.cipher;
1973 addr->ourcert = tls_out.ourcert;
1974 addr->peercert = tls_out.peercert;
1975 addr->peerdn = tls_out.peerdn;
1976 addr->ocsp = tls_out.ocsp;
1977 }
1978 }
1979 }
1980
1981 /* if smtps, we'll have smtp_command set to something else; always safe to
1982 reset it here. */
1983 smtp_command = big_buffer;
1984
1985 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1986 helo_data is null, we are dealing with a connection that was passed from
1987 another process, and so we won't have expanded helo_data above. We have to
1988 expand it here. $sending_ip_address and $sending_port are set up right at the
1989 start of the Exim process (in exim.c). */
1990
1991 if (tls_out.active >= 0)
1992 {
1993 char *greeting_cmd;
1994 BOOL good_response;
1995
1996 if (helo_data == NULL)
1997 {
1998 helo_data = expand_string(ob->helo_data);
1999 if (helo_data == NULL)
2000 {
2001 uschar *message = string_sprintf("failed to expand helo_data: %s",
2002 expand_string_message);
2003 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2004 yield = DEFER;
2005 goto SEND_QUIT;
2006 }
2007 }
2008
2009 /* For SMTPS we need to wait for the initial OK response. */
2010 if (lflags.smtps)
2011 {
2012 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2013 '2', ob->command_timeout);
2014 #ifdef EXPERIMENTAL_DSN_INFO
2015 smtp_greeting = string_copy(buffer);
2016 #endif
2017 if (!good_response) goto RESPONSE_FAILED;
2018 }
2019
2020 if (lflags.esmtp)
2021 greeting_cmd = "EHLO";
2022 else
2023 {
2024 greeting_cmd = "HELO";
2025 DEBUG(D_transport)
2026 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2027 }
2028
2029 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
2030 lflags.lmtp ? "LHLO" : greeting_cmd, helo_data) < 0)
2031 goto SEND_FAILED;
2032 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2033 '2', ob->command_timeout);
2034 #ifdef EXPERIMENTAL_DSN_INFO
2035 helo_response = string_copy(buffer);
2036 #endif
2037 if (!good_response) goto RESPONSE_FAILED;
2038 smtp_peer_options = 0;
2039 }
2040
2041 /* If the host is required to use a secure channel, ensure that we
2042 have one. */
2043
2044 else if ( lflags.smtps
2045 # ifdef EXPERIMENTAL_DANE
2046 || lflags.dane
2047 # endif
2048 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
2049 )
2050 {
2051 save_errno = ERRNO_TLSREQUIRED;
2052 message = string_sprintf("a TLS session is required, but %s",
2053 smtp_peer_options & PEER_OFFERED_TLS
2054 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2055 goto TLS_FAILED;
2056 }
2057 #endif /*SUPPORT_TLS*/
2058
2059 /* If TLS is active, we have just started it up and re-done the EHLO command,
2060 so its response needs to be analyzed. If TLS is not active and this is a
2061 continued session down a previously-used socket, we haven't just done EHLO, so
2062 we skip this. */
2063
2064 if (continue_hostname == NULL
2065 #ifdef SUPPORT_TLS
2066 || tls_out.active >= 0
2067 #endif
2068 )
2069 {
2070 if (lflags.esmtp || lflags.lmtp)
2071 {
2072 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2073 0 /* no TLS */
2074 | (lflags.lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2075 | PEER_OFFERED_CHUNKING
2076 | PEER_OFFERED_PRDR
2077 #ifdef SUPPORT_I18N
2078 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2079 /*XXX if we hand peercaps on to continued-conn processes,
2080 must not depend on this addr */
2081 #endif
2082 | PEER_OFFERED_DSN
2083 | PEER_OFFERED_PIPE
2084 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2085 );
2086
2087 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2088 lmtp_ignore_quota option was set. */
2089
2090 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2091
2092 /* If the response to EHLO specified support for the SIZE parameter, note
2093 this, provided size_addition is non-negative. */
2094
2095 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2096
2097 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2098 the current host, esmtp will be false, so PIPELINING can never be used. If
2099 the current host matches hosts_avoid_pipelining, don't do it. */
2100
2101 if ( peer_offered & PEER_OFFERED_PIPE
2102 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2103 smtp_peer_options |= PEER_OFFERED_PIPE;
2104
2105 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2106 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2107
2108 if ( peer_offered & PEER_OFFERED_CHUNKING
2109 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2110 peer_offered &= ~PEER_OFFERED_CHUNKING;
2111
2112 if (peer_offered & PEER_OFFERED_CHUNKING)
2113 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2114
2115 #ifndef DISABLE_PRDR
2116 if ( peer_offered & PEER_OFFERED_PRDR
2117 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2118 peer_offered &= ~PEER_OFFERED_PRDR;
2119
2120 if (peer_offered & PEER_OFFERED_PRDR)
2121 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2122 #endif
2123
2124 /* Note if the server supports DSN */
2125 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2126 DEBUG(D_transport) debug_printf("%susing DSN\n",
2127 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2128
2129 /* Note if the response to EHLO specifies support for the AUTH extension.
2130 If it has, check that this host is one we want to authenticate to, and do
2131 the business. The host name and address must be available when the
2132 authenticator's client driver is running. */
2133
2134 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2135 ob, lflags.esmtp, &inblock, &outblock))
2136 {
2137 default: goto SEND_QUIT;
2138 case OK: break;
2139 case FAIL_SEND: goto SEND_FAILED;
2140 case FAIL: goto RESPONSE_FAILED;
2141 }
2142 }
2143 }
2144 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2145
2146 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2147 message-specific. */
2148
2149 lflags.setting_up = FALSE;
2150
2151 #ifdef SUPPORT_I18N
2152 if (addrlist->prop.utf8_msg)
2153 {
2154 lflags.utf8_needed = !addrlist->prop.utf8_downcvt
2155 && !addrlist->prop.utf8_downcvt_maybe;
2156 DEBUG(D_transport) if (!lflags.utf8_needed)
2157 debug_printf("utf8: %s downconvert\n",
2158 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2159 }
2160
2161 /* If this is an international message we need the host to speak SMTPUTF8 */
2162 if (lflags.utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2163 {
2164 errno = ERRNO_UTF8_FWD;
2165 goto RESPONSE_FAILED;
2166 }
2167 #endif
2168
2169 /* If there is a filter command specified for this transport, we can now
2170 set it up. This cannot be done until the identify of the host is known. */
2171
2172 if (tblock->filter_command != NULL)
2173 {
2174 BOOL rc;
2175 uschar buffer[64];
2176 sprintf(CS buffer, "%.50s transport", tblock->name);
2177 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2178 TRUE, DEFER, addrlist, buffer, NULL);
2179 transport_filter_timeout = tblock->filter_timeout;
2180
2181 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2182 yield ERROR. */
2183
2184 if (!rc)
2185 {
2186 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2187 FALSE);
2188 yield = ERROR;
2189 goto SEND_QUIT;
2190 }
2191
2192 if ( transport_filter_argv
2193 && *transport_filter_argv
2194 && **transport_filter_argv
2195 && peer_offered & PEER_OFFERED_CHUNKING
2196 )
2197 {
2198 peer_offered &= ~PEER_OFFERED_CHUNKING;
2199 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2200 }
2201 }
2202
2203
2204 /* For messages that have more than the maximum number of envelope recipients,
2205 we want to send several transactions down the same SMTP connection. (See
2206 comments in deliver.c as to how this reconciles, heuristically, with
2207 remote_max_parallel.) This optimization was added to Exim after the following
2208 code was already working. The simplest way to put it in without disturbing the
2209 code was to use a goto to jump back to this point when there is another
2210 transaction to handle. */
2211
2212 SEND_MESSAGE:
2213 sync_addr = first_addr;
2214 address_count = 0;
2215 lflags.ok = FALSE;
2216 lflags.send_rset = TRUE;
2217 completed_address = FALSE;
2218
2219
2220 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2221 qualification, send it, adding something to the message size to allow for
2222 imprecision and things that get added en route. Exim keeps the number of lines
2223 in a message, so we can give an accurate value for the original message, but we
2224 need some additional to handle added headers. (Double "." characters don't get
2225 included in the count.) */
2226
2227 p = buffer;
2228 *p = 0;
2229
2230 if (peer_offered & PEER_OFFERED_SIZE)
2231 {
2232 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2233 while (*p) p++;
2234 }
2235
2236 #ifndef DISABLE_PRDR
2237 lflags.prdr_active = FALSE;
2238 if (peer_offered & PEER_OFFERED_PRDR)
2239 for (addr = first_addr; addr; addr = addr->next)
2240 if (addr->transport_return == PENDING_DEFER)
2241 {
2242 for (addr = addr->next; addr; addr = addr->next)
2243 if (addr->transport_return == PENDING_DEFER)
2244 { /* at least two recipients to send */
2245 lflags.prdr_active = TRUE;
2246 sprintf(CS p, " PRDR"); p += 5;
2247 break;
2248 }
2249 break;
2250 }
2251 #endif
2252
2253 #ifdef SUPPORT_I18N
2254 if ( addrlist->prop.utf8_msg
2255 && !addrlist->prop.utf8_downcvt
2256 && peer_offered & PEER_OFFERED_UTF8
2257 )
2258 sprintf(CS p, " SMTPUTF8"), p += 9;
2259 #endif
2260
2261 /* check if all addresses have lasthop flag */
2262 /* do not send RET and ENVID if true */
2263 for (lflags.dsn_all_lasthop = TRUE, addr = first_addr;
2264 address_count < max_rcpt && addr != NULL;
2265 addr = addr->next)
2266 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2267 {
2268 lflags.dsn_all_lasthop = FALSE;
2269 break;
2270 }
2271
2272 /* Add any DSN flags to the mail command */
2273
2274 if (peer_offered & PEER_OFFERED_DSN && !lflags.dsn_all_lasthop)
2275 {
2276 if (dsn_ret == dsn_ret_hdrs)
2277 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2278 else if (dsn_ret == dsn_ret_full)
2279 { Ustrcpy(p, " RET=FULL"); p += 9; }
2280
2281 if (dsn_envid)
2282 {
2283 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2284 while (*p) p++;
2285 }
2286 }
2287
2288 /* If an authenticated_sender override has been specified for this transport
2289 instance, expand it. If the expansion is forced to fail, and there was already
2290 an authenticated_sender for this message, the original value will be used.
2291 Other expansion failures are serious. An empty result is ignored, but there is
2292 otherwise no check - this feature is expected to be used with LMTP and other
2293 cases where non-standard addresses (e.g. without domains) might be required. */
2294
2295 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2296 {
2297 yield = ERROR;
2298 goto SEND_QUIT;
2299 }
2300
2301 /* From here until we send the DATA command, we can make use of PIPELINING
2302 if the server host supports it. The code has to be able to check the responses
2303 at any point, for when the buffer fills up, so we write it totally generally.
2304 When PIPELINING is off, each command written reports that it has flushed the
2305 buffer. */
2306
2307 lflags.pending_MAIL = TRUE; /* The block starts with MAIL */
2308
2309 {
2310 uschar * s = return_path;
2311 #ifdef SUPPORT_I18N
2312 uschar * errstr = NULL;
2313
2314 /* If we must downconvert, do the from-address here. Remember we had to
2315 for the to-addresses (done below), and also (ugly) for re-doing when building
2316 the delivery log line. */
2317
2318 if ( addrlist->prop.utf8_msg
2319 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2320 )
2321 {
2322 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2323 {
2324 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2325 yield = ERROR;
2326 goto SEND_QUIT;
2327 }
2328 setflag(addrlist, af_utf8_downcvt);
2329 }
2330 #endif
2331
2332 rc = smtp_write_command(&outblock, pipelining_active,
2333 "MAIL FROM:<%s>%s\r\n", s, buffer);
2334 }
2335
2336 mail_command = string_copy(big_buffer); /* Save for later error message */
2337
2338 switch(rc)
2339 {
2340 case -1: /* Transmission error */
2341 goto SEND_FAILED;
2342
2343 case +1: /* Block was sent */
2344 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2345 ob->command_timeout))
2346 {
2347 if (errno == 0 && buffer[0] == '4')
2348 {
2349 errno = ERRNO_MAIL4XX;
2350 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2351 }
2352 goto RESPONSE_FAILED;
2353 }
2354 lflags.pending_MAIL = FALSE;
2355 break;
2356 }
2357
2358 /* Pass over all the relevant recipient addresses for this host, which are the
2359 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2360 several before we have to read the responses for those seen so far. This
2361 checking is done by a subroutine because it also needs to be done at the end.
2362 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2363 the next one if not all are sent.
2364
2365 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2366 last address because we want to abort if any recipients have any kind of
2367 problem, temporary or permanent. We know that all recipient addresses will have
2368 the PENDING_DEFER status, because only one attempt is ever made, and we know
2369 that max_rcpt will be large, so all addresses will be done at once. */
2370
2371 for (addr = first_addr;
2372 addr && address_count < max_rcpt;
2373 addr = addr->next)
2374 if (addr->transport_return == PENDING_DEFER)
2375 {
2376 int count;
2377 BOOL no_flush;
2378 uschar * rcpt_addr;
2379
2380 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2381 ? dsn_support_yes : dsn_support_no;
2382
2383 address_count++;
2384 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2385
2386 /* Add any DSN flags to the rcpt command and add to the sent string */
2387
2388 p = buffer;
2389 *p = 0;
2390
2391 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2392 {
2393 if (addr->dsn_flags & rf_dsnflags)
2394 {
2395 int i;
2396 BOOL first = TRUE;
2397 Ustrcpy(p, " NOTIFY=");
2398 while (*p) p++;
2399 for (i = 0; i < 4; i++)
2400 if ((addr->dsn_flags & rf_list[i]) != 0)
2401 {
2402 if (!first) *p++ = ',';
2403 first = FALSE;
2404 Ustrcpy(p, rf_names[i]);
2405 while (*p) p++;
2406 }
2407 }
2408
2409 if (addr->dsn_orcpt)
2410 {
2411 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2412 addr->dsn_orcpt);
2413 while (*p) p++;
2414 }
2415 }
2416
2417 /* Now send the RCPT command, and process outstanding responses when
2418 necessary. After a timeout on RCPT, we just end the function, leaving the
2419 yield as OK, because this error can often mean that there is a problem with
2420 just one address, so we don't want to delay the host. */
2421
2422 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2423
2424 #ifdef SUPPORT_I18N
2425 {
2426 uschar * dummy_errstr;
2427 if ( testflag(addrlist, af_utf8_downcvt)
2428 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2429 dummy_errstr
2430 ) )
2431 {
2432 errno = ERRNO_EXPANDFAIL;
2433 goto SEND_FAILED;
2434 }
2435 }
2436 #endif
2437
2438 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2439 rcpt_addr, igquotstr, buffer);
2440
2441 if (count < 0) goto SEND_FAILED;
2442 if (count > 0)
2443 {
2444 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2445 &sync_addr, host, count, ob->address_retry_include_sender,
2446 lflags.pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2447 sizeof(buffer)))
2448 {
2449 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2450 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2451 break;
2452
2453 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2454 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2455 case 0: /* No 2xx or 5xx, but no probs */
2456 break;
2457
2458 case -1: goto END_OFF; /* Timeout on RCPT */
2459 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2460 }
2461 lflags.pending_MAIL = FALSE; /* Dealt with MAIL */
2462 }
2463 } /* Loop for next address */
2464
2465 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2466 permanently or temporarily. We should have flushed and synced after the last
2467 RCPT. */
2468
2469 if (mua_wrapper)
2470 {
2471 address_item *badaddr;
2472 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2473 if (badaddr->transport_return != PENDING_OK)
2474 {
2475 /*XXX could we find a better errno than 0 here? */
2476 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2477 testflag(badaddr, af_pass_message));
2478 lflags.ok = FALSE;
2479 break;
2480 }
2481 }
2482
2483 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2484 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2485 have a good recipient buffered up if we are pipelining. We don't want to waste
2486 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2487 are pipelining. The responses are all handled by sync_responses().
2488 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2489 to send is. */
2490
2491 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2492 && (lflags.ok || (pipelining_active && !mua_wrapper)))
2493 {
2494 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2495
2496 if (count < 0) goto SEND_FAILED;
2497 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2498 host, count, ob->address_retry_include_sender, lflags.pending_MAIL,
2499 lflags.ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2500 {
2501 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2502 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2503 break;
2504
2505 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2506 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2507 case 0: break; /* No 2xx or 5xx, but no probs */
2508
2509 case -1: goto END_OFF; /* Timeout on RCPT */
2510 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2511 }
2512 pipelining_active = FALSE;
2513 }
2514
2515 /* If there were no good recipients (but otherwise there have been no
2516 problems), just set ok TRUE, since we have handled address-specific errors
2517 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2518 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2519 well as body. Set the appropriate timeout value to be used for each chunk.
2520 (Haven't been able to make it work using select() for writing yet.) */
2521
2522 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !lflags.ok)
2523 {
2524 /* Save the first address of the next batch. */
2525 first_addr = addr;
2526
2527 lflags.ok = TRUE;
2528 }
2529 else
2530 {
2531 transport_ctx tctx = {
2532 tblock,
2533 addrlist,
2534 US".", US"..", /* Escaping strings */
2535 topt_use_crlf | topt_escape_headers
2536 | (tblock->body_only ? topt_no_headers : 0)
2537 | (tblock->headers_only ? topt_no_body : 0)
2538 | (tblock->return_path_add ? topt_add_return_path : 0)
2539 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2540 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2541 };
2542
2543 /* If using CHUNKING we need a callback from the generic transport
2544 support to us, for the sending of BDAT smtp commands and the reaping
2545 of responses. The callback needs a whole bunch of state so set up
2546 a transport-context structure to be passed around. */
2547
2548 if (peer_offered & PEER_OFFERED_CHUNKING)
2549 {
2550 tctx.check_string = tctx.escape_string = NULL;
2551 tctx.options |= topt_use_bdat;
2552 tctx.chunk_cb = smtp_chunk_cmd_callback;
2553 tctx.inblock = &inblock;
2554 tctx.outblock = &outblock;
2555 tctx.host = host;
2556 tctx.first_addr = first_addr;
2557 tctx.sync_addr = &sync_addr;
2558 tctx.pending_MAIL = lflags.pending_MAIL;
2559 tctx.pending_BDAT = FALSE;
2560 tctx.good_RCPT = lflags.ok;
2561 tctx.completed_address = &completed_address;
2562 tctx.cmd_count = 0;
2563 tctx.buffer = buffer;
2564 }
2565 else
2566 tctx.options |= topt_end_dot;
2567
2568 /* Save the first address of the next batch. */
2569 first_addr = addr;
2570
2571 /* Responses from CHUNKING commands go in buffer. Otherwise,
2572 there has not been a response. */
2573
2574 buffer[0] = 0;
2575
2576 sigalrm_seen = FALSE;
2577 transport_write_timeout = ob->data_timeout;
2578 smtp_command = US"sending data block"; /* For error messages */
2579 DEBUG(D_transport|D_v)
2580 if (peer_offered & PEER_OFFERED_CHUNKING)
2581 debug_printf(" will write message using CHUNKING\n");
2582 else
2583 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2584 transport_count = 0;
2585
2586 #ifndef DISABLE_DKIM
2587 lflags.ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2588 #else
2589 lflags.ok = transport_write_message(inblock.sock, &tctx, 0);
2590 #endif
2591
2592 /* transport_write_message() uses write() because it is called from other
2593 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2594 it can exit with "Broken pipe" as its error. This really means that the
2595 socket got closed at the far end. */
2596
2597 transport_write_timeout = 0; /* for subsequent transports */
2598
2599 /* Failure can either be some kind of I/O disaster (including timeout),
2600 or the failure of a transport filter or the expansion of added headers.
2601 Or, when CHUNKING, it can be a protocol-detected failure. */
2602
2603 if (!lflags.ok)
2604 goto RESPONSE_FAILED;
2605
2606 /* We used to send the terminating "." explicitly here, but because of
2607 buffering effects at both ends of TCP/IP connections, you don't gain
2608 anything by keeping it separate, so it might as well go in the final
2609 data buffer for efficiency. This is now done by setting the topt_end_dot
2610 flag above. */
2611
2612 smtp_command = US"end of data";
2613
2614 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2615 {
2616 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2617 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2618 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2619 lflags.pending_MAIL, 0,
2620 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2621 {
2622 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2623 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2624 break;
2625
2626 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2627 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2628 case 0: break; /* No 2xx or 5xx, but no probs */
2629
2630 case -1: goto END_OFF; /* Timeout on RCPT */
2631 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2632 }
2633 }
2634
2635 #ifndef DISABLE_PRDR
2636 /* For PRDR we optionally get a partial-responses warning
2637 * followed by the individual responses, before going on with
2638 * the overall response. If we don't get the warning then deal
2639 * with per non-PRDR. */
2640 if(lflags.prdr_active)
2641 {
2642 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2643 ob->final_timeout);
2644 if (!lflags.ok && errno == 0) switch(buffer[0])
2645 {
2646 case '2': lflags.prdr_active = FALSE;
2647 lflags.ok = TRUE;
2648 break;
2649 case '4': errno = ERRNO_DATA4XX;
2650 addrlist->more_errno |=
2651 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2652 break;
2653 }
2654 }
2655 else
2656 #endif
2657
2658 /* For non-PRDR SMTP, we now read a single response that applies to the
2659 whole message. If it is OK, then all the addresses have been delivered. */
2660
2661 if (!lflags.lmtp)
2662 {
2663 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2664 ob->final_timeout);
2665 if (!lflags.ok && errno == 0 && buffer[0] == '4')
2666 {
2667 errno = ERRNO_DATA4XX;
2668 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2669 }
2670 }
2671
2672 /* For LMTP, we get back a response for every RCPT command that we sent;
2673 some may be accepted and some rejected. For those that get a response, their
2674 status is fixed; any that are accepted have been handed over, even if later
2675 responses crash - at least, that's how I read RFC 2033.
2676
2677 If all went well, mark the recipient addresses as completed, record which
2678 host/IPaddress they were delivered to, and cut out RSET when sending another
2679 message down the same channel. Write the completed addresses to the journal
2680 now so that they are recorded in case there is a crash of hardware or
2681 software before the spool gets updated. Also record the final SMTP
2682 confirmation if needed (for SMTP only). */
2683
2684 if (lflags.ok)
2685 {
2686 int flag = '=';
2687 int delivery_time = (int)(time(NULL) - start_delivery_time);
2688 int len;
2689 uschar *conf = NULL;
2690
2691 lflags.send_rset = FALSE;
2692 pipelining_active = FALSE;
2693
2694 /* Set up confirmation if needed - applies only to SMTP */
2695
2696 if (
2697 #ifdef DISABLE_EVENT
2698 LOGGING(smtp_confirmation) &&
2699 #endif
2700 !lflags.lmtp
2701 )
2702 {
2703 const uschar *s = string_printing(buffer);
2704 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2705 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2706 }
2707
2708 /* Process all transported addresses - for LMTP or PRDR, read a status for
2709 each one. */
2710
2711 for (addr = addrlist; addr != first_addr; addr = addr->next)
2712 {
2713 if (addr->transport_return != PENDING_OK) continue;
2714
2715 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2716 remaining addresses. Otherwise, it's a return code for just the one
2717 address. For temporary errors, add a retry item for the address so that
2718 it doesn't get tried again too soon. */
2719
2720 #ifndef DISABLE_PRDR
2721 if (lflags.lmtp || lflags.prdr_active)
2722 #else
2723 if (lflags.lmtp)
2724 #endif
2725 {
2726 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2727 ob->final_timeout))
2728 {
2729 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2730 addr->message = string_sprintf(
2731 #ifndef DISABLE_PRDR
2732 "%s error after %s: %s", lflags.prdr_active ? "PRDR":"LMTP",
2733 #else
2734 "LMTP error after %s: %s",
2735 #endif
2736 big_buffer, string_printing(buffer));
2737 setflag(addr, af_pass_message); /* Allow message to go to user */
2738 if (buffer[0] == '5')
2739 addr->transport_return = FAIL;
2740 else
2741 {
2742 errno = ERRNO_DATA4XX;
2743 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2744 addr->transport_return = DEFER;
2745 #ifndef DISABLE_PRDR
2746 if (!lflags.prdr_active)
2747 #endif
2748 retry_add_item(addr, addr->address_retry_key, 0);
2749 }
2750 continue;
2751 }
2752 completed_address = TRUE; /* NOW we can set this flag */
2753 if (LOGGING(smtp_confirmation))
2754 {
2755 const uschar *s = string_printing(buffer);
2756 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2757 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2758 }
2759 }
2760
2761 /* SMTP, or success return from LMTP for this address. Pass back the
2762 actual host that was used. */
2763
2764 addr->transport_return = OK;
2765 addr->more_errno = delivery_time;
2766 addr->host_used = host;
2767 addr->special_action = flag;
2768 addr->message = conf;
2769 #ifndef DISABLE_PRDR
2770 if (lflags.prdr_active) addr->flags |= af_prdr_used;
2771 #endif
2772 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2773 flag = '-';
2774
2775 #ifndef DISABLE_PRDR
2776 if (!lflags.prdr_active)
2777 #endif
2778 {
2779 /* Update the journal. For homonymic addresses, use the base address plus
2780 the transport name. See lots of comments in deliver.c about the reasons
2781 for the complications when homonyms are involved. Just carry on after
2782 write error, as it may prove possible to update the spool file later. */
2783
2784 if (testflag(addr, af_homonym))
2785 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2786 else
2787 sprintf(CS buffer, "%.500s\n", addr->unique);
2788
2789 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2790 len = Ustrlen(CS buffer);
2791 if (write(journal_fd, buffer, len) != len)
2792 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2793 "%s: %s", buffer, strerror(errno));
2794 }
2795 }
2796
2797 #ifndef DISABLE_PRDR
2798 if (lflags.prdr_active)
2799 {
2800 /* PRDR - get the final, overall response. For any non-success
2801 upgrade all the address statuses. */
2802 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2803 ob->final_timeout);
2804 if (!lflags.ok)
2805 {
2806 if(errno == 0 && buffer[0] == '4')
2807 {
2808 errno = ERRNO_DATA4XX;
2809 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2810 }
2811 for (addr = addrlist; addr != first_addr; addr = addr->next)
2812 if (buffer[0] == '5' || addr->transport_return == OK)
2813 addr->transport_return = PENDING_OK; /* allow set_errno action */
2814 goto RESPONSE_FAILED;
2815 }
2816
2817 /* Update the journal, or setup retry. */
2818 for (addr = addrlist; addr != first_addr; addr = addr->next)
2819 if (addr->transport_return == OK)
2820 {
2821 if (testflag(addr, af_homonym))
2822 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2823 else
2824 sprintf(CS buffer, "%.500s\n", addr->unique);
2825
2826 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2827 len = Ustrlen(CS buffer);
2828 if (write(journal_fd, buffer, len) != len)
2829 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2830 "%s: %s", buffer, strerror(errno));
2831 }
2832 else if (addr->transport_return == DEFER)
2833 retry_add_item(addr, addr->address_retry_key, -2);
2834 }
2835 #endif
2836
2837 /* Ensure the journal file is pushed out to disk. */
2838
2839 if (EXIMfsync(journal_fd) < 0)
2840 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2841 strerror(errno));
2842 }
2843 }
2844
2845
2846 /* Handle general (not specific to one address) failures here. The value of ok
2847 is used to skip over this code on the falling through case. A timeout causes a
2848 deferral. Other errors may defer or fail according to the response code, and
2849 may set up a special errno value, e.g. after connection chopped, which is
2850 assumed if errno == 0 and there is no text in the buffer. If control reaches
2851 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2852 the problem is not related to this specific message. */
2853
2854 if (!lflags.ok)
2855 {
2856 int code, set_rc;
2857 uschar * set_message;
2858
2859 RESPONSE_FAILED:
2860 {
2861 save_errno = errno;
2862 message = NULL;
2863 lflags.send_quit = check_response(host, &save_errno, addrlist->more_errno,
2864 buffer, &code, &message, &pass_message);
2865 goto FAILED;
2866 }
2867
2868 SEND_FAILED:
2869 {
2870 save_errno = errno;
2871 code = '4';
2872 message = US string_sprintf("send() to %s [%s] failed: %s",
2873 host->name, host->address, strerror(save_errno));
2874 lflags.send_quit = FALSE;
2875 goto FAILED;
2876 }
2877
2878 /* This label is jumped to directly when a TLS negotiation has failed,
2879 or was not done for a host for which it is required. Values will be set
2880 in message and save_errno, and setting_up will always be true. Treat as
2881 a temporary error. */
2882
2883 #ifdef SUPPORT_TLS
2884 TLS_FAILED:
2885 code = '4';
2886 #endif
2887
2888 /* If the failure happened while setting up the call, see if the failure was
2889 a 5xx response (this will either be on connection, or following HELO - a 5xx
2890 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2891 never going to accept them. For other errors during setting up (timeouts or
2892 whatever), defer all addresses, and yield DEFER, so that the host is not
2893 tried again for a while. */
2894
2895 FAILED:
2896 lflags.ok = FALSE; /* For when reached by GOTO */
2897 set_message = message;
2898
2899 if (lflags.setting_up)
2900 if (code == '5')
2901 set_rc = FAIL;
2902 else
2903 yield = set_rc = DEFER;
2904
2905 /* We want to handle timeouts after MAIL or "." and loss of connection after
2906 "." specially. They can indicate a problem with the sender address or with
2907 the contents of the message rather than a real error on the connection. These
2908 cases are treated in the same way as a 4xx response. This next bit of code
2909 does the classification. */
2910
2911 else
2912 {
2913 BOOL message_error;
2914
2915 switch(save_errno)
2916 {
2917 #ifdef SUPPORT_I18N
2918 case ERRNO_UTF8_FWD:
2919 code = '5';
2920 /*FALLTHROUGH*/
2921 #endif
2922 case 0:
2923 case ERRNO_MAIL4XX:
2924 case ERRNO_DATA4XX:
2925 message_error = TRUE;
2926 break;
2927
2928 case ETIMEDOUT:
2929 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2930 Ustrncmp(smtp_command,"end ",4) == 0;
2931 break;
2932
2933 case ERRNO_SMTPCLOSED:
2934 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2935 break;
2936
2937 default:
2938 message_error = FALSE;
2939 break;
2940 }
2941
2942 /* Handle the cases that are treated as message errors. These are:
2943
2944 (a) negative response or timeout after MAIL
2945 (b) negative response after DATA
2946 (c) negative response or timeout or dropped connection after "."
2947 (d) utf8 support required and not offered
2948
2949 It won't be a negative response or timeout after RCPT, as that is dealt
2950 with separately above. The action in all cases is to set an appropriate
2951 error code for all the addresses, but to leave yield set to OK because the
2952 host itself has not failed. Of course, it might in practice have failed
2953 when we've had a timeout, but if so, we'll discover that at the next
2954 delivery attempt. For a temporary error, set the message_defer flag, and
2955 write to the logs for information if this is not the last host. The error
2956 for the last host will be logged as part of the address's log line. */
2957
2958 if (message_error)
2959 {
2960 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2961
2962 /* If there's an errno, the message contains just the identity of
2963 the host. */
2964
2965 if (code == '5')
2966 set_rc = FAIL;
2967 else /* Anything other than 5 is treated as temporary */
2968 {
2969 set_rc = DEFER;
2970 if (save_errno > 0)
2971 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2972 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2973 msglog_line(host, message);
2974 *message_defer = TRUE;
2975 }
2976 }
2977
2978 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2979 ".", or some other transportation error. We defer all addresses and yield
2980 DEFER, except for the case of failed add_headers expansion, or a transport
2981 filter failure, when the yield should be ERROR, to stop it trying other
2982 hosts. */
2983
2984 else
2985 {
2986 set_rc = DEFER;
2987 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2988 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2989 }
2990 }
2991
2992 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2993 #ifdef EXPERIMENTAL_DSN_INFO
2994 , smtp_greeting, helo_response
2995 #endif
2996 );
2997 }
2998
2999
3000 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3001 SMTP session tidily. However, if there were too many addresses to send in one
3002 message (indicated by first_addr being non-NULL) we want to carry on with the
3003 rest of them. Also, it is desirable to send more than one message down the SMTP
3004 connection if there are several waiting, provided we haven't already sent so
3005 many as to hit the configured limit. The function transport_check_waiting looks
3006 for a waiting message and returns its id. Then transport_pass_socket tries to
3007 set up a continued delivery by passing the socket on to another process. The
3008 variable send_rset is FALSE if a message has just been successfully transfered.
3009
3010 If we are already sending down a continued channel, there may be further
3011 addresses not yet delivered that are aimed at the same host, but which have not
3012 been passed in this run of the transport. In this case, continue_more will be
3013 true, and all we should do is send RSET if necessary, and return, leaving the
3014 channel open.
3015
3016 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3017 do not want to continue with other messages down the same channel, because that
3018 can lead to looping between two or more messages, all with the same,
3019 temporarily failing address(es). [The retry information isn't updated yet, so
3020 new processes keep on trying.] We probably also don't want to try more of this
3021 message's addresses either.
3022
3023 If we have started a TLS session, we have to end it before passing the
3024 connection to a new process. However, not all servers can handle this (Exim
3025 can), so we do not pass such a connection on if the host matches
3026 hosts_nopass_tls. */
3027
3028 DEBUG(D_transport)
3029 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3030 "yield=%d first_address is %sNULL\n", lflags.ok, lflags.send_quit,
3031 lflags.send_rset, continue_more, yield, first_addr ? "not " : "");
3032
3033 if (completed_address && lflags.ok && lflags.send_quit)
3034 {
3035 BOOL more;
3036 smtp_compare_t t_compare;
3037
3038 t_compare.tblock = tblock;
3039 t_compare.current_sender_address = sender_address;
3040
3041 if ( first_addr != NULL
3042 || continue_more
3043 || ( ( tls_out.active < 0
3044 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
3045 )
3046 &&
3047 transport_check_waiting(tblock->name, host->name,
3048 tblock->connection_max_messages, new_message_id, &more,
3049 (oicf)smtp_are_same_identities, (void*)&t_compare)
3050 ) )
3051 {
3052 uschar *msg;
3053 BOOL pass_message;
3054
3055 if (lflags.send_rset)
3056 {
3057 if (! (lflags.ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3058 {
3059 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3060 host->address, strerror(save_errno));
3061 lflags.send_quit = FALSE;
3062 }
3063 else if (! (lflags.ok = smtp_read_response(&inblock, buffer,
3064 sizeof(buffer), '2', ob->command_timeout)))
3065 {
3066 int code;
3067 lflags.send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3068 &pass_message);
3069 if (!lflags.send_quit)
3070 {
3071 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3072 host->name, host->address, msg);
3073 }
3074 }
3075 }
3076
3077 /* Either RSET was not needed, or it succeeded */
3078
3079 if (lflags.ok)
3080 {
3081 if (first_addr != NULL) /* More addresses still to be sent */
3082 { /* in this run of the transport */
3083 continue_sequence++; /* Causes * in logging */
3084 goto SEND_MESSAGE;
3085 }
3086 if (continue_more) return yield; /* More addresses for another run */
3087
3088 /* Pass the socket to a new Exim process. Before doing so, we must shut
3089 down TLS. Not all MTAs allow for the continuation of the SMTP session
3090 when TLS is shut down. We test for this by sending a new EHLO. If we
3091 don't get a good response, we don't attempt to pass the socket on. */
3092
3093 #ifdef SUPPORT_TLS
3094 if (tls_out.active >= 0)
3095 {
3096 tls_close(FALSE, TRUE);
3097 smtp_peer_options = smtp_peer_options_wrap;
3098 if (lflags.smtps)
3099 lflags.ok = FALSE;
3100 else
3101 lflags.ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3102 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3103 ob->command_timeout);
3104 }
3105 #endif
3106
3107 /* If the socket is successfully passed, we musn't send QUIT (or
3108 indeed anything!) from here. */
3109
3110 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3111 propagate it from the initial
3112 */
3113 if (lflags.ok && transport_pass_socket(tblock->name, host->name,
3114 host->address, new_message_id, inblock.sock))
3115 lflags.send_quit = FALSE;
3116 }
3117
3118 /* If RSET failed and there are addresses left, they get deferred. */
3119
3120 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3121 #ifdef EXPERIMENTAL_DSN_INFO
3122 , smtp_greeting, helo_response
3123 #endif
3124 );
3125 }
3126 }
3127
3128 /* End off tidily with QUIT unless the connection has died or the socket has
3129 been passed to another process. There has been discussion on the net about what
3130 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3131 to wait for a response, but on the other hand, there isn't anything one can do
3132 with an error response, other than log it. Exim used to do that. However,
3133 further discussion suggested that it is positively advantageous not to wait for
3134 the response, but to close the session immediately. This is supposed to move
3135 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3136 load from the server. (Hosts that are both servers and clients may not see much
3137 difference, of course.) Further discussion indicated that this was safe to do
3138 on Unix systems which have decent implementations of TCP/IP that leave the
3139 connection around for a while (TIME_WAIT) after the application has gone away.
3140 This enables the response sent by the server to be properly ACKed rather than
3141 timed out, as can happen on broken TCP/IP implementations on other OS.
3142
3143 This change is being made on 31-Jul-98. After over a year of trouble-free
3144 operation, the old commented-out code was removed on 17-Sep-99. */
3145
3146 SEND_QUIT:
3147 if (lflags.send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3148
3149 END_OFF:
3150
3151 #ifdef SUPPORT_TLS
3152 tls_close(FALSE, TRUE);
3153 #endif
3154
3155 /* Close the socket, and return the appropriate value, first setting
3156 works because the NULL setting is passed back to the calling process, and
3157 remote_max_parallel is forced to 1 when delivering over an existing connection,
3158
3159 If all went well and continue_more is set, we shouldn't actually get here if
3160 there are further addresses, as the return above will be taken. However,
3161 writing RSET might have failed, or there may be other addresses whose hosts are
3162 specified in the transports, and therefore not visible at top level, in which
3163 case continue_more won't get set. */
3164
3165 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3166 (void)close(inblock.sock);
3167
3168 #ifndef DISABLE_EVENT
3169 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3170 #endif
3171
3172 continue_transport = NULL;
3173 continue_hostname = NULL;
3174 return yield;
3175 }
3176
3177
3178
3179
3180 /*************************************************
3181 * Closedown entry point *
3182 *************************************************/
3183
3184 /* This function is called when exim is passed an open smtp channel
3185 from another incarnation, but the message which it has been asked
3186 to deliver no longer exists. The channel is on stdin.
3187
3188 We might do fancy things like looking for another message to send down
3189 the channel, but if the one we sought has gone, it has probably been
3190 delivered by some other process that itself will seek further messages,
3191 so just close down our connection.
3192
3193 Argument: pointer to the transport instance block
3194 Returns: nothing
3195 */
3196
3197 void
3198 smtp_transport_closedown(transport_instance *tblock)
3199 {
3200 smtp_transport_options_block *ob =
3201 (smtp_transport_options_block *)(tblock->options_block);
3202 smtp_inblock inblock;
3203 smtp_outblock outblock;
3204 uschar buffer[256];
3205 uschar inbuffer[4096];
3206 uschar outbuffer[16];
3207
3208 inblock.sock = fileno(stdin);
3209 inblock.buffer = inbuffer;
3210 inblock.buffersize = sizeof(inbuffer);
3211 inblock.ptr = inbuffer;
3212 inblock.ptrend = inbuffer;
3213
3214 outblock.sock = inblock.sock;
3215 outblock.buffersize = sizeof(outbuffer);
3216 outblock.buffer = outbuffer;
3217 outblock.ptr = outbuffer;
3218 outblock.cmd_count = 0;
3219 outblock.authenticating = FALSE;
3220
3221 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3222 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3223 ob->command_timeout);
3224 (void)close(inblock.sock);
3225 }
3226
3227
3228
3229 /*************************************************
3230 * Prepare addresses for delivery *
3231 *************************************************/
3232
3233 /* This function is called to flush out error settings from previous delivery
3234 attempts to other hosts. It also records whether we got here via an MX record
3235 or not in the more_errno field of the address. We are interested only in
3236 addresses that are still marked DEFER - others may have got delivered to a
3237 previously considered IP address. Set their status to PENDING_DEFER to indicate
3238 which ones are relevant this time.
3239
3240 Arguments:
3241 addrlist the list of addresses
3242 host the host we are delivering to
3243
3244 Returns: the first address for this delivery
3245 */
3246
3247 static address_item *
3248 prepare_addresses(address_item *addrlist, host_item *host)
3249 {
3250 address_item *first_addr = NULL;
3251 address_item *addr;
3252 for (addr = addrlist; addr; addr = addr->next)
3253 if (addr->transport_return == DEFER)
3254 {
3255 if (!first_addr) first_addr = addr;
3256 addr->transport_return = PENDING_DEFER;
3257 addr->basic_errno = 0;
3258 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3259 addr->message = NULL;
3260 #ifdef SUPPORT_TLS
3261 addr->cipher = NULL;
3262 addr->ourcert = NULL;
3263 addr->peercert = NULL;
3264 addr->peerdn = NULL;
3265 addr->ocsp = OCSP_NOT_REQ;
3266 #endif
3267 #ifdef EXPERIMENTAL_DSN_INFO
3268 addr->smtp_greeting = NULL;
3269 addr->helo_response = NULL;
3270 #endif
3271 }
3272 return first_addr;
3273 }
3274
3275
3276
3277 /*************************************************
3278 * Main entry point *
3279 *************************************************/
3280
3281 /* See local README for interface details. As this is a remote transport, it is
3282 given a chain of addresses to be delivered in one connection, if possible. It
3283 always returns TRUE, indicating that each address has its own independent
3284 status set, except if there is a setting up problem, in which case it returns
3285 FALSE. */
3286
3287 BOOL
3288 smtp_transport_entry(
3289 transport_instance *tblock, /* data for this instantiation */
3290 address_item *addrlist) /* addresses we are working on */
3291 {
3292 int cutoff_retry;
3293 int port;
3294 int hosts_defer = 0;
3295 int hosts_fail = 0;
3296 int hosts_looked_up = 0;
3297 int hosts_retry = 0;
3298 int hosts_serial = 0;
3299 int hosts_total = 0;
3300 int total_hosts_tried = 0;
3301 address_item *addr;
3302 BOOL expired = TRUE;
3303 uschar *expanded_hosts = NULL;
3304 uschar *pistring;
3305 uschar *tid = string_sprintf("%s transport", tblock->name);
3306 smtp_transport_options_block *ob =
3307 (smtp_transport_options_block *)(tblock->options_block);
3308 host_item *hostlist = addrlist->host_list;
3309 host_item *host = NULL;
3310
3311 DEBUG(D_transport)
3312 {
3313 debug_printf("%s transport entered\n", tblock->name);
3314 for (addr = addrlist; addr; addr = addr->next)
3315 debug_printf(" %s\n", addr->address);
3316 if (hostlist)
3317 {
3318 debug_printf("hostlist:\n");
3319 for (host = hostlist; host; host = host->next)
3320 debug_printf(" %s:%d\n", host->name, host->port);
3321 }
3322 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3323 continue_hostname, continue_host_address);
3324 }
3325
3326 /* Set the flag requesting that these hosts be added to the waiting
3327 database if the delivery fails temporarily or if we are running with
3328 queue_smtp or a 2-stage queue run. This gets unset for certain
3329 kinds of error, typically those that are specific to the message. */
3330
3331 update_waiting = TRUE;
3332
3333 /* If a host list is not defined for the addresses - they must all have the
3334 same one in order to be passed to a single transport - or if the transport has
3335 a host list with hosts_override set, use the host list supplied with the
3336 transport. It is an error for this not to exist. */
3337
3338 if (!hostlist || (ob->hosts_override && ob->hosts))
3339 {
3340 if (!ob->hosts)
3341 {
3342 addrlist->message = string_sprintf("%s transport called with no hosts set",
3343 tblock->name);
3344 addrlist->transport_return = PANIC;
3345 return FALSE; /* Only top address has status */
3346 }
3347
3348 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3349 ob->hosts);
3350
3351 /* If the transport's host list contains no '$' characters, and we are not
3352 randomizing, it is fixed and therefore a chain of hosts can be built once
3353 and for all, and remembered for subsequent use by other calls to this
3354 transport. If, on the other hand, the host list does contain '$', or we are
3355 randomizing its order, we have to rebuild it each time. In the fixed case,
3356 as the hosts string will never be used again, it doesn't matter that we
3357 replace all the : characters with zeros. */
3358
3359 if (!ob->hostlist)
3360 {
3361 uschar *s = ob->hosts;
3362
3363 if (Ustrchr(s, '$') != NULL)
3364 {
3365 if (!(expanded_hosts = expand_string(s)))
3366 {
3367 addrlist->message = string_sprintf("failed to expand list of hosts "
3368 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3369 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3370 return FALSE; /* Only top address has status */
3371 }
3372 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3373 "\"%s\"\n", s, expanded_hosts);
3374 s = expanded_hosts;
3375 }
3376 else
3377 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3378
3379 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3380
3381 /* Check that the expansion yielded something useful. */
3382 if (!hostlist)
3383 {
3384 addrlist->message =
3385 string_sprintf("%s transport has empty hosts setting", tblock->name);
3386 addrlist->transport_return = PANIC;
3387 return FALSE; /* Only top address has status */
3388 }
3389
3390 /* If there was no expansion of hosts, save the host list for
3391 next time. */
3392
3393 if (!expanded_hosts) ob->hostlist = hostlist;
3394 }
3395
3396 /* This is not the first time this transport has been run in this delivery;
3397 the host list was built previously. */
3398
3399 else
3400 hostlist = ob->hostlist;
3401 }
3402
3403 /* The host list was supplied with the address. If hosts_randomize is set, we
3404 must sort it into a random order if it did not come from MX records and has not
3405 already been randomized (but don't bother if continuing down an existing
3406 connection). */
3407
3408 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3409 {
3410 host_item *newlist = NULL;
3411 while (hostlist)
3412 {
3413 host_item *h = hostlist;
3414 hostlist = hostlist->next;
3415
3416 h->sort_key = random_number(100);
3417
3418 if (!newlist)
3419 {
3420 h->next = NULL;
3421 newlist = h;
3422 }
3423 else if (h->sort_key < newlist->sort_key)
3424 {
3425 h->next = newlist;
3426 newlist = h;
3427 }
3428 else
3429 {
3430 host_item *hh = newlist;
3431 while (hh->next)
3432 {
3433 if (h->sort_key < hh->next->sort_key) break;
3434 hh = hh->next;
3435 }
3436 h->next = hh->next;
3437 hh->next = h;
3438 }
3439 }
3440
3441 hostlist = addrlist->host_list = newlist;
3442 }
3443
3444 /* Sort out the default port. */
3445
3446 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3447
3448 /* For each host-plus-IP-address on the list:
3449
3450 . If this is a continued delivery and the host isn't the one with the
3451 current connection, skip.
3452
3453 . If the status is unusable (i.e. previously failed or retry checked), skip.
3454
3455 . If no IP address set, get the address, either by turning the name into
3456 an address, calling gethostbyname if gethostbyname is on, or by calling
3457 the DNS. The DNS may yield multiple addresses, in which case insert the
3458 extra ones into the list.
3459
3460 . Get the retry data if not previously obtained for this address and set the
3461 field which remembers the state of this address. Skip if the retry time is
3462 not reached. If not, remember whether retry data was found. The retry string
3463 contains both the name and the IP address.
3464
3465 . Scan the list of addresses and mark those whose status is DEFER as
3466 PENDING_DEFER. These are the only ones that will be processed in this cycle
3467 of the hosts loop.
3468
3469 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3470 Some addresses may be successfully delivered, others may fail, and yet
3471 others may get temporary errors and so get marked DEFER.
3472
3473 . The return from the delivery attempt is OK if a connection was made and a
3474 valid SMTP dialogue was completed. Otherwise it is DEFER.
3475
3476 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3477
3478 . If fail to connect, or other defer state, add a retry item.
3479
3480 . If there are any addresses whose status is still DEFER, carry on to the
3481 next host/IPaddress, unless we have tried the number of hosts given
3482 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3483 there is some fancy logic for hosts_max_try that means its limit can be
3484 overstepped in some circumstances.
3485
3486 If we get to the end of the list, all hosts have deferred at least one address,
3487 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3488 delivery attempt to those hosts whose last try was before the arrival time of
3489 the current message. To cope with this, we have to go round the loop a second
3490 time. After that, set the status and error data for any addresses that haven't
3491 had it set already. */
3492
3493 for (cutoff_retry = 0;
3494 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3495 cutoff_retry++)
3496 {
3497 host_item *nexthost = NULL;
3498 int unexpired_hosts_tried = 0;
3499
3500 for (host = hostlist;
3501 host
3502 && unexpired_hosts_tried < ob->hosts_max_try
3503 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3504 host = nexthost)
3505 {
3506 int rc;
3507 int host_af;
3508 uschar *rs;
3509 BOOL host_is_expired = FALSE;
3510 BOOL message_defer = FALSE;
3511 BOOL some_deferred = FALSE;
3512 address_item *first_addr = NULL;
3513 uschar *interface = NULL;
3514 uschar *retry_host_key = NULL;
3515 uschar *retry_message_key = NULL;
3516 uschar *serialize_key = NULL;
3517
3518 /* Default next host is next host. :-) But this can vary if the
3519 hosts_max_try limit is hit (see below). It may also be reset if a host
3520 address is looked up here (in case the host was multihomed). */
3521
3522 nexthost = host->next;
3523
3524 /* If the address hasn't yet been obtained from the host name, look it up
3525 now, unless the host is already marked as unusable. If it is marked as
3526 unusable, it means that the router was unable to find its IP address (in
3527 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3528 the lookup failed last time. We don't get this far if *all* MX records
3529 point to non-existent hosts; that is treated as a hard error.
3530
3531 We can just skip this host entirely. When the hosts came from the router,
3532 the address will timeout based on the other host(s); when the address is
3533 looked up below, there is an explicit retry record added.
3534
3535 Note that we mustn't skip unusable hosts if the address is not unset; they
3536 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3537
3538 if (!host->address)
3539 {
3540 int new_port, flags;
3541 host_item *hh;
3542
3543 if (host->status >= hstatus_unusable)
3544 {
3545 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3546 host->name);
3547 continue;
3548 }
3549
3550 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3551
3552 /* The host name is permitted to have an attached port. Find it, and
3553 strip it from the name. Just remember it for now. */
3554
3555 new_port = host_item_get_port(host);
3556
3557 /* Count hosts looked up */
3558
3559 hosts_looked_up++;
3560
3561 /* Find by name if so configured, or if it's an IP address. We don't
3562 just copy the IP address, because we need the test-for-local to happen. */
3563
3564 flags = HOST_FIND_BY_A;
3565 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3566 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3567
3568 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3569 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3570 else
3571 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3572 &ob->dnssec, /* domains for request/require */
3573 NULL, NULL);
3574
3575 /* Update the host (and any additional blocks, resulting from
3576 multihoming) with a host-specific port, if any. */
3577
3578 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3579
3580 /* Failure to find the host at this time (usually DNS temporary failure)
3581 is really a kind of routing failure rather than a transport failure.
3582 Therefore we add a retry item of the routing kind, not to stop us trying
3583 to look this name up here again, but to ensure the address gets timed
3584 out if the failures go on long enough. A complete failure at this point
3585 commonly points to a configuration error, but the best action is still
3586 to carry on for the next host. */
3587
3588 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3589 {
3590 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3591 expired = FALSE;
3592 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3593 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3594 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3595 host->status = hstatus_unusable;
3596
3597 for (addr = addrlist; addr; addr = addr->next)
3598 {
3599 if (addr->transport_return != DEFER) continue;
3600 addr->basic_errno = ERRNO_UNKNOWNHOST;
3601 addr->message =
3602 string_sprintf("failed to lookup IP address for %s", host->name);
3603 }
3604 continue;
3605 }
3606
3607 /* If the host is actually the local host, we may have a problem, or
3608 there may be some cunning configuration going on. In the problem case,
3609 log things and give up. The default transport status is already DEFER. */
3610
3611 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3612 {
3613 for (addr = addrlist; addr; addr = addr->next)
3614 {
3615 addr->basic_errno = 0;
3616 addr->message = string_sprintf("%s transport found host %s to be "
3617 "local", tblock->name, host->name);
3618 }
3619 goto END_TRANSPORT;
3620 }
3621 } /* End of block for IP address lookup */
3622
3623 /* If this is a continued delivery, we are interested only in the host
3624 which matches the name of the existing open channel. The check is put
3625 here after the local host lookup, in case the name gets expanded as a
3626 result of the lookup. Set expired FALSE, to save the outer loop executing
3627 twice. */
3628
3629 if ( continue_hostname
3630 && ( Ustrcmp(continue_hostname, host->name) != 0
3631 || Ustrcmp(continue_host_address, host->address) != 0
3632 ) )
3633 {
3634 expired = FALSE;
3635 continue; /* With next host */
3636 }
3637
3638 /* Reset the default next host in case a multihomed host whose addresses
3639 are not looked up till just above added to the host list. */
3640
3641 nexthost = host->next;
3642
3643 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3644 domain is in queue_smtp_domains, we don't actually want to attempt any
3645 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3646 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3647 were not in it. We don't want to hold up all SMTP deliveries! Except when
3648 doing a two-stage queue run, don't do this if forcing. */
3649
3650 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3651 match_isinlist(addrlist->domain,
3652 (const uschar **)&queue_smtp_domains, 0,
3653 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3654 {
3655 expired = FALSE;
3656 for (addr = addrlist; addr; addr = addr->next)
3657 if (addr->transport_return == DEFER)
3658 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3659 continue; /* With next host */
3660 }
3661
3662 /* Count hosts being considered - purely for an intelligent comment
3663 if none are usable. */
3664
3665 hosts_total++;
3666
3667 /* Set $host and $host address now in case they are needed for the
3668 interface expansion or the serialize_hosts check; they remain set if an
3669 actual delivery happens. */
3670
3671 deliver_host = host->name;
3672 deliver_host_address = host->address;
3673 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3674 : host->dnssec == DS_NO ? US"no"
3675 : US"";
3676
3677 /* Set up a string for adding to the retry key if the port number is not
3678 the standard SMTP port. A host may have its own port setting that overrides
3679 the default. */
3680
3681 pistring = string_sprintf(":%d", host->port == PORT_NONE
3682 ? port : host->port);
3683 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3684
3685 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3686 string is set, even if constant (as different transports can have different
3687 constant settings), we must add it to the key that is used for retries,
3688 because connections to the same host from a different interface should be
3689 treated separately. */
3690
3691 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3692 if ((rs = ob->interface) && *rs)
3693 {
3694 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3695 return FALSE;
3696 pistring = string_sprintf("%s/%s", pistring, interface);
3697 }
3698
3699 /* The first time round the outer loop, check the status of the host by
3700 inspecting the retry data. The second time round, we are interested only
3701 in expired hosts that haven't been tried since this message arrived. */
3702
3703 if (cutoff_retry == 0)
3704 {
3705 BOOL incl_ip;
3706 /* Ensure the status of the address is set by checking retry data if
3707 necessary. There may be host-specific retry data (applicable to all
3708 messages) and also data for retries of a specific message at this host.
3709 If either of these retry records are actually read, the keys used are
3710 returned to save recomputing them later. */
3711
3712 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3713 US"retry_include_ip_address", ob->retry_include_ip_address,
3714 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3715 continue; /* with next host */
3716
3717 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3718 incl_ip, &retry_host_key, &retry_message_key);
3719
3720 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3721 (host->address == NULL)? US"" : host->address, pistring,
3722 (host->status == hstatus_usable)? "usable" :
3723 (host->status == hstatus_unusable)? "unusable" :
3724 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3725
3726 /* Skip this address if not usable at this time, noting if it wasn't
3727 actually expired, both locally and in the address. */
3728
3729 switch (host->status)
3730 {
3731 case hstatus_unusable:
3732 expired = FALSE;
3733 setflag(addrlist, af_retry_skipped);
3734 /* Fall through */
3735
3736 case hstatus_unusable_expired:
3737 switch (host->why)
3738 {
3739 case hwhy_retry: hosts_retry++; break;
3740 case hwhy_failed: hosts_fail++; break;
3741 case hwhy_deferred: hosts_defer++; break;
3742 }
3743
3744 /* If there was a retry message key, implying that previously there
3745 was a message-specific defer, we don't want to update the list of
3746 messages waiting for these hosts. */
3747
3748 if (retry_message_key) update_waiting = FALSE;
3749 continue; /* With the next host or IP address */
3750 }
3751 }
3752
3753 /* Second time round the loop: if the address is set but expired, and
3754 the message is newer than the last try, let it through. */
3755
3756 else
3757 {
3758 if ( !host->address
3759 || host->status != hstatus_unusable_expired
3760 || host->last_try > received_time)
3761 continue;
3762 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3763 host->name, host->address, pistring);
3764 host_is_expired = TRUE;
3765 }
3766
3767 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3768 it remains TRUE only if all hosts are expired and none are actually tried.
3769 */
3770
3771 expired = FALSE;
3772
3773 /* If this host is listed as one to which access must be serialized,
3774 see if another Exim process has a connection to it, and if so, skip
3775 this host. If not, update the database to record our connection to it
3776 and remember this for later deletion. Do not do any of this if we are
3777 sending the message down a pre-existing connection. */
3778
3779 if ( !continue_hostname
3780 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3781 {
3782 serialize_key = string_sprintf("host-serialize-%s", host->name);
3783 if (!enq_start(serialize_key, 1))
3784 {
3785 DEBUG(D_transport)
3786 debug_printf("skipping host %s because another Exim process "
3787 "is connected to it\n", host->name);
3788 hosts_serial++;
3789 continue;
3790 }
3791 }
3792
3793 /* OK, we have an IP address that is not waiting for its retry time to
3794 arrive (it might be expired) OR (second time round the loop) we have an
3795 expired host that hasn't been tried since the message arrived. Have a go
3796 at delivering the message to it. First prepare the addresses by flushing
3797 out the result of previous attempts, and finding the first address that
3798 is still to be delivered. */
3799
3800 first_addr = prepare_addresses(addrlist, host);
3801
3802 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3803 message_id, host->name, host->address, addrlist->address,
3804 addrlist->next ? ", ..." : "");
3805
3806 set_process_info("delivering %s to %s [%s] (%s%s)",
3807 message_id, host->name, host->address, addrlist->address,
3808 addrlist->next ? ", ..." : "");
3809
3810 /* This is not for real; don't do the delivery. If there are
3811 any remaining hosts, list them. */
3812
3813 if (dont_deliver)
3814 {
3815 host_item *host2;
3816 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3817 for (addr = addrlist; addr; addr = addr->next)
3818 {
3819 addr->host_used = host;
3820 addr->special_action = '*';
3821 addr->message = US"delivery bypassed by -N option";
3822 }
3823 DEBUG(D_transport)
3824 {
3825 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3826 "*** host and remaining hosts:\n", tblock->name);
3827 for (host2 = host; host2; host2 = host2->next)
3828 debug_printf(" %s [%s]\n", host2->name,
3829 host2->address ? host2->address : US"unset");
3830 }
3831 rc = OK;
3832 }
3833
3834 /* This is for real. If the host is expired, we don't count it for
3835 hosts_max_retry. This ensures that all hosts must expire before an address
3836 is timed out, unless hosts_max_try_hardlimit (which protects against
3837 lunatic DNS configurations) is reached.
3838
3839 If the host is not expired and we are about to hit the hosts_max_retry
3840 limit, check to see if there is a subsequent hosts with a different MX
3841 value. If so, make that the next host, and don't count this one. This is a
3842 heuristic to make sure that different MXs do get tried. With a normal kind
3843 of retry rule, they would get tried anyway when the earlier hosts were
3844 delayed, but if the domain has a "retry every time" type of rule - as is
3845 often used for the the very large ISPs, that won't happen. */
3846
3847 else
3848 {
3849 host_item * thost;
3850 /* Make a copy of the host if it is local to this invocation
3851 of the transport. */
3852
3853 if (expanded_hosts)
3854 {
3855 thost = store_get(sizeof(host_item));
3856 *thost = *host;
3857 thost->name = string_copy(host->name);
3858 thost->address = string_copy(host->address);
3859 }
3860 else
3861 thost = host;
3862
3863 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3864 {
3865 host_item *h;
3866 DEBUG(D_transport)
3867 debug_printf("hosts_max_try limit reached with this host\n");
3868 for (h = host; h; h = h->next) if (h->mx != host->mx)
3869 {
3870 nexthost = h;
3871 unexpired_hosts_tried--;
3872 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3873 "and will be tried\n");
3874 break;
3875 }
3876 }
3877
3878 /* Attempt the delivery. */
3879
3880 total_hosts_tried++;
3881 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3882 &message_defer, FALSE);
3883
3884 /* Yield is one of:
3885 OK => connection made, each address contains its result;
3886 message_defer is set for message-specific defers (when all
3887 recipients are marked defer)
3888 DEFER => there was a non-message-specific delivery problem;
3889 ERROR => there was a problem setting up the arguments for a filter,
3890 or there was a problem with expanding added headers
3891 */
3892
3893 /* If the result is not OK, there was a non-message-specific problem.
3894 If the result is DEFER, we need to write to the logs saying what happened
3895 for this particular host, except in the case of authentication and TLS
3896 failures, where the log has already been written. If all hosts defer a
3897 general message is written at the end. */
3898
3899 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3900 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3901 write_logs(first_addr, host);
3902
3903 #ifndef DISABLE_EVENT
3904 if (rc == DEFER)
3905 deferred_event_raise(first_addr, host);
3906 #endif
3907
3908 /* If STARTTLS was accepted, but there was a failure in setting up the
3909 TLS session (usually a certificate screwup), and the host is not in
3910 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3911 TLS forcibly turned off. We have to start from scratch with a new SMTP
3912 connection. That's why the retry is done from here, not from within
3913 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3914 session, so the in-clear transmission after those errors, if permitted,
3915 happens inside smtp_deliver().] */
3916
3917 #ifdef SUPPORT_TLS
3918 if ( rc == DEFER
3919 && first_addr->basic_errno == ERRNO_TLSFAILURE
3920 && ob->tls_tempfail_tryclear
3921 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3922 )
3923 {
3924 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3925 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3926 first_addr = prepare_addresses(addrlist, host);
3927 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3928 &message_defer, TRUE);
3929 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3930 write_logs(first_addr, host);
3931 # ifndef DISABLE_EVENT
3932 if (rc == DEFER)
3933 deferred_event_raise(first_addr, host);
3934 # endif
3935 }
3936 #endif /*SUPPORT_TLS*/
3937 }
3938
3939 /* Delivery attempt finished */
3940
3941 rs = rc == OK ? US"OK"
3942 : rc == DEFER ? US"DEFER"
3943 : rc == ERROR ? US"ERROR"
3944 : US"?";
3945
3946 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3947 message_id, host->name, host->address, addrlist->address,
3948 addrlist->next ? " (& others)" : "", rs);
3949
3950 /* Release serialization if set up */
3951
3952 if (serialize_key) enq_end(serialize_key);
3953
3954 /* If the result is DEFER, or if a host retry record is known to exist, we
3955 need to add an item to the retry chain for updating the retry database
3956 at the end of delivery. We only need to add the item to the top address,
3957 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3958 for any other delivery attempts using the same address. (It is copied into
3959 the unusable tree at the outer level, so even if different address blocks
3960 contain the same address, it still won't get tried again.) */
3961
3962 if (rc == DEFER || retry_host_key)
3963 {
3964 int delete_flag = rc != DEFER ? rf_delete : 0;
3965 if (!retry_host_key)
3966 {
3967 BOOL incl_ip;
3968 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3969 US"retry_include_ip_address", ob->retry_include_ip_address,
3970 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3971 incl_ip = TRUE; /* error; use most-specific retry record */
3972
3973 retry_host_key = incl_ip
3974 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3975 : string_sprintf("T:%S%s", host->name, pistring);
3976 }
3977
3978 /* If a delivery of another message over an existing SMTP connection
3979 yields DEFER, we do NOT set up retry data for the host. This covers the
3980 case when there are delays in routing the addresses in the second message
3981 that are so long that the server times out. This is alleviated by not
3982 routing addresses that previously had routing defers when handling an
3983 existing connection, but even so, this case may occur (e.g. if a
3984 previously happily routed address starts giving routing defers). If the
3985 host is genuinely down, another non-continued message delivery will
3986 notice it soon enough. */
3987
3988 if (delete_flag != 0 || !continue_hostname)
3989 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3990
3991 /* We may have tried an expired host, if its retry time has come; ensure
3992 the status reflects the expiry for the benefit of any other addresses. */
3993
3994 if (rc == DEFER)
3995 {
3996 host->status = host_is_expired
3997 ? hstatus_unusable_expired : hstatus_unusable;
3998 host->why = hwhy_deferred;
3999 }
4000 }
4001
4002 /* If message_defer is set (host was OK, but every recipient got deferred
4003 because of some message-specific problem), or if that had happened
4004 previously so that a message retry key exists, add an appropriate item
4005 to the retry chain. Note that if there was a message defer but now there is
4006 a host defer, the message defer record gets deleted. That seems perfectly
4007 reasonable. Also, stop the message from being remembered as waiting
4008 for specific hosts. */
4009
4010 if (message_defer || retry_message_key)
4011 {
4012 int delete_flag = message_defer ? 0 : rf_delete;
4013 if (!retry_message_key)
4014 {
4015 BOOL incl_ip;
4016 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4017 US"retry_include_ip_address", ob->retry_include_ip_address,
4018 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4019 incl_ip = TRUE; /* error; use most-specific retry record */
4020
4021 retry_message_key = incl_ip
4022 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4023 message_id)
4024 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4025 }
4026 retry_add_item(addrlist, retry_message_key,
4027 rf_message | rf_host | delete_flag);
4028 update_waiting = FALSE;
4029 }
4030
4031 /* Any return other than DEFER (that is, OK or ERROR) means that the
4032 addresses have got their final statuses filled in for this host. In the OK
4033 case, see if any of them are deferred. */
4034
4035 if (rc == OK)
4036 for (addr = addrlist; addr; addr = addr->next)
4037 if (addr->transport_return == DEFER)
4038 {
4039 some_deferred = TRUE;
4040 break;
4041 }
4042
4043 /* If no addresses deferred or the result was ERROR, return. We do this for
4044 ERROR because a failing filter set-up or add_headers expansion is likely to
4045 fail for any host we try. */
4046
4047 if (rc == ERROR || (rc == OK && !some_deferred))
4048 {
4049 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4050 return TRUE; /* Each address has its status */
4051 }
4052
4053 /* If the result was DEFER or some individual addresses deferred, let
4054 the loop run to try other hosts with the deferred addresses, except for the
4055 case when we were trying to deliver down an existing channel and failed.
4056 Don't try any other hosts in this case. */
4057
4058 if (continue_hostname) break;
4059
4060 /* If the whole delivery, or some individual addresses, were deferred and
4061 there are more hosts that could be tried, do not count this host towards
4062 the hosts_max_try limit if the age of the message is greater than the
4063 maximum retry time for this host. This means we may try try all hosts,
4064 ignoring the limit, when messages have been around for some time. This is
4065 important because if we don't try all hosts, the address will never time
4066 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4067
4068 if ((rc == DEFER || some_deferred) && nexthost)
4069 {
4070 BOOL timedout;
4071 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4072
4073 if (retry && retry->rules)
4074 {
4075 retry_rule *last_rule;
4076 for (last_rule = retry->rules;
4077 last_rule->next;
4078 last_rule = last_rule->next);
4079 timedout = time(NULL) - received_time > last_rule->timeout;
4080 }
4081 else timedout = TRUE; /* No rule => timed out */
4082
4083 if (timedout)
4084 {
4085 unexpired_hosts_tried--;
4086 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4087 "hosts_max_try (message older than host's retry time)\n");
4088 }
4089 }
4090 } /* End of loop for trying multiple hosts. */
4091
4092 /* This is the end of the loop that repeats iff expired is TRUE and
4093 ob->delay_after_cutoff is FALSE. The second time round we will
4094 try those hosts that haven't been tried since the message arrived. */
4095
4096 DEBUG(D_transport)
4097 {
4098 debug_printf("all IP addresses skipped or deferred at least one address\n");
4099 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4100 debug_printf("retrying IP addresses not tried since message arrived\n");
4101 }
4102 }
4103
4104
4105 /* Get here if all IP addresses are skipped or defer at least one address. In
4106 MUA wrapper mode, this will happen only for connection or other non-message-
4107 specific failures. Force the delivery status for all addresses to FAIL. */
4108
4109 if (mua_wrapper)
4110 {
4111 for (addr = addrlist; addr; addr = addr->next)
4112 addr->transport_return = FAIL;
4113 goto END_TRANSPORT;
4114 }
4115
4116 /* In the normal, non-wrapper case, add a standard message to each deferred
4117 address if there hasn't been an error, that is, if it hasn't actually been
4118 tried this time. The variable "expired" will be FALSE if any deliveries were
4119 actually tried, or if there was at least one host that was not expired. That
4120 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4121 a delivery has been tried, an error code will be set, and the failing of the
4122 message is handled by the retry code later.
4123
4124 If queue_smtp is set, or this transport was called to send a subsequent message
4125 down an existing TCP/IP connection, and something caused the host not to be
4126 found, we end up here, but can detect these cases and handle them specially. */
4127
4128 for (addr = addrlist; addr; addr = addr->next)
4129 {
4130 /* If host is not NULL, it means that we stopped processing the host list
4131 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4132 means we need to behave as if some hosts were skipped because their retry
4133 time had not come. Specifically, this prevents the address from timing out.
4134 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4135 hosts were tried. */
4136
4137 if (host)
4138 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4139 {
4140 DEBUG(D_transport)
4141 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4142 "hosts were tried\n");
4143 }
4144 else
4145 {
4146 DEBUG(D_transport)
4147 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4148 setflag(addr, af_retry_skipped);
4149 }
4150
4151 if (queue_smtp) /* no deliveries attempted */
4152 {
4153 addr->transport_return = DEFER;
4154 addr->basic_errno = 0;
4155 addr->message = US"SMTP delivery explicitly queued";
4156 }
4157
4158 else if ( addr->transport_return == DEFER
4159 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4160 && !addr->message
4161 )
4162 {
4163 addr->basic_errno = ERRNO_HRETRY;
4164 if (continue_hostname)
4165 addr->message = US"no host found for existing SMTP connection";
4166 else if (expired)
4167 {
4168 setflag(addr, af_pass_message); /* This is not a security risk */
4169 addr->message = string_sprintf(
4170 "all hosts%s have been failing for a long time %s",
4171 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4172 ob->delay_after_cutoff
4173 ? US"(and retry time not reached)"
4174 : US"and were last tried after this message arrived");
4175
4176 /* If we are already using fallback hosts, or there are no fallback hosts
4177 defined, convert the result to FAIL to cause a bounce. */
4178
4179 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4180 addr->transport_return = FAIL;
4181 }
4182 else
4183 {
4184 const char * s;
4185 if (hosts_retry == hosts_total)
4186 s = "retry time not reached for any host%s";
4187 else if (hosts_fail == hosts_total)
4188 s = "all host address lookups%s failed permanently";
4189 else if (hosts_defer == hosts_total)
4190 s = "all host address lookups%s failed temporarily";
4191 else if (hosts_serial == hosts_total)
4192 s = "connection limit reached for all hosts%s";
4193 else if (hosts_fail+hosts_defer == hosts_total)
4194 s = "all host address lookups%s failed";
4195 else
4196 s = "some host address lookups failed and retry time "
4197 "not reached for other hosts or connection limit reached%s";
4198
4199 addr->message = string_sprintf(s,
4200 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4201 }
4202 }
4203 }
4204
4205 /* Update the database which keeps information about which messages are waiting
4206 for which hosts to become available. For some message-specific errors, the
4207 update_waiting flag is turned off because we don't want follow-on deliveries in
4208 those cases. If this transport instance is explicitly limited to one message
4209 per connection then follow-on deliveries are not possible and there's no need
4210 to create/update the per-transport wait-<transport_name> database. */
4211
4212 if (update_waiting && tblock->connection_max_messages != 1)
4213 transport_update_waiting(hostlist, tblock->name);
4214
4215 END_TRANSPORT:
4216
4217 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4218
4219 return TRUE; /* Each address has its status */
4220 }
4221
4222 /* vi: aw ai sw=2
4223 */
4224 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.