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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15 #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 static int off = 0; /* for use by setsockopt */
290
291
292 /*************************************************
293 * Setup entry point *
294 *************************************************/
295
296 /* This function is called when the transport is about to be used,
297 but before running it in a sub-process. It is used for two things:
298
299 (1) To set the fallback host list in addresses, when delivering.
300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
302
303 Arguments:
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
309 errmsg place for error message (not used)
310
311 Returns: OK always (FAIL, DEFER not used)
312 */
313
314 static int
315 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
317 {
318 smtp_transport_options_block *ob =
319 (smtp_transport_options_block *)(tblock->options_block);
320
321 errmsg = errmsg; /* Keep picky compilers happy */
322 uid = uid;
323 gid = gid;
324
325 /* Pass back options if required. This interface is getting very messy. */
326
327 if (tf != NULL)
328 {
329 tf->interface = ob->interface;
330 tf->port = ob->port;
331 tf->protocol = ob->protocol;
332 tf->hosts = ob->hosts;
333 tf->hosts_override = ob->hosts_override;
334 tf->hosts_randomize = ob->hosts_randomize;
335 tf->gethostbyname = ob->gethostbyname;
336 tf->qualify_single = ob->dns_qualify_single;
337 tf->search_parents = ob->dns_search_parents;
338 tf->helo_data = ob->helo_data;
339 }
340
341 /* Set the fallback host list for all the addresses that don't have fallback
342 host lists, provided that the local host wasn't present in the original host
343 list. */
344
345 if (!testflag(addrlist, af_local_host_removed))
346 {
347 for (; addrlist != NULL; addrlist = addrlist->next)
348 if (addrlist->fallback_hosts == NULL)
349 addrlist->fallback_hosts = ob->fallback_hostlist;
350 }
351
352 return OK;
353 }
354
355
356
357 /*************************************************
358 * Initialization entry point *
359 *************************************************/
360
361 /* Called for each instance, after its options have been read, to
362 enable consistency checks to be done, or anything else that needs
363 to be set up.
364
365 Argument: pointer to the transport instance block
366 Returns: nothing
367 */
368
369 void
370 smtp_transport_init(transport_instance *tblock)
371 {
372 smtp_transport_options_block *ob =
373 (smtp_transport_options_block *)(tblock->options_block);
374
375 /* Retry_use_local_part defaults FALSE if unset */
376
377 if (tblock->retry_use_local_part == TRUE_UNSET)
378 tblock->retry_use_local_part = FALSE;
379
380 /* Set the default port according to the protocol */
381
382 if (ob->port == NULL)
383 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
384 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
385
386 /* Set up the setup entry point, to be called before subprocesses for this
387 transport. */
388
389 tblock->setup = smtp_transport_setup;
390
391 /* Complain if any of the timeouts are zero. */
392
393 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
394 ob->final_timeout <= 0)
395 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
396 "command, data, or final timeout value is zero for %s transport",
397 tblock->name);
398
399 /* If hosts_override is set and there are local hosts, set the global
400 flag that stops verify from showing router hosts. */
401
402 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
403
404 /* If there are any fallback hosts listed, build a chain of host items
405 for them, but do not do any lookups at this time. */
406
407 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
408 }
409
410
411
412
413
414 /*************************************************
415 * Set delivery info into all active addresses *
416 *************************************************/
417
418 /* Only addresses whose status is >= PENDING are relevant. A lesser
419 status means that an address is not currently being processed.
420
421 Arguments:
422 addrlist points to a chain of addresses
423 errno_value to put in each address's errno field
424 msg to put in each address's message field
425 rc to put in each address's transport_return field
426 pass_message if TRUE, set the "pass message" flag in the address
427 host if set, mark addrs as having used this host
428 smtp_greeting from peer
429 helo_response from peer
430
431 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
432 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
433 this particular type of timeout.
434
435 Returns: nothing
436 */
437
438 static void
439 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
440 BOOL pass_message, host_item * host
441 #ifdef EXPERIMENTAL_DSN_INFO
442 , const uschar * smtp_greeting, const uschar * helo_response
443 #endif
444 )
445 {
446 address_item *addr;
447 int orvalue = 0;
448 if (errno_value == ERRNO_CONNECTTIMEOUT)
449 {
450 errno_value = ETIMEDOUT;
451 orvalue = RTEF_CTOUT;
452 }
453 for (addr = addrlist; addr; addr = addr->next)
454 if (addr->transport_return >= PENDING)
455 {
456 addr->basic_errno = errno_value;
457 addr->more_errno |= orvalue;
458 if (msg != NULL)
459 {
460 addr->message = msg;
461 if (pass_message) setflag(addr, af_pass_message);
462 }
463 addr->transport_return = rc;
464 if (host)
465 {
466 addr->host_used = host;
467 #ifdef EXPERIMENTAL_DSN_INFO
468 if (smtp_greeting)
469 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
470 addr->smtp_greeting = smtp_greeting;
471
472 if (helo_response)
473 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
474 addr->helo_response = helo_response;
475 #endif
476 }
477 }
478 }
479
480 static void
481 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
482 BOOL pass_message)
483 {
484 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
485 #ifdef EXPERIMENTAL_DSN_INFO
486 , NULL, NULL
487 #endif
488 );
489 }
490
491
492 /*************************************************
493 * Check an SMTP response *
494 *************************************************/
495
496 /* This function is given an errno code and the SMTP response buffer
497 to analyse, together with the host identification for generating messages. It
498 sets an appropriate message and puts the first digit of the response code into
499 the yield variable. If no response was actually read, a suitable digit is
500 chosen.
501
502 Arguments:
503 host the current host, to get its name for messages
504 errno_value pointer to the errno value
505 more_errno from the top address for use with ERRNO_FILTER_FAIL
506 buffer the SMTP response buffer
507 yield where to put a one-digit SMTP response code
508 message where to put an errror message
509 pass_message set TRUE if message is an SMTP response
510
511 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
512 */
513
514 static BOOL
515 check_response(host_item *host, int *errno_value, int more_errno,
516 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
517 {
518 uschar * pl = pipelining_active ? US"pipelined " : US"";
519
520 *yield = '4'; /* Default setting is to give a temporary error */
521
522 /* Handle response timeout */
523
524 if (*errno_value == ETIMEDOUT)
525 {
526 *message = US string_sprintf("SMTP timeout after %s%s",
527 pl, smtp_command);
528 if (transport_count > 0)
529 *message = US string_sprintf("%s (%d bytes written)", *message,
530 transport_count);
531 return FALSE;
532 }
533
534 /* Handle malformed SMTP response */
535
536 if (*errno_value == ERRNO_SMTPFORMAT)
537 {
538 const uschar *malfresp = string_printing(buffer);
539 while (isspace(*malfresp)) malfresp++;
540 *message = *malfresp == 0
541 ? string_sprintf("Malformed SMTP reply (an empty line) "
542 "in response to %s%s", pl, smtp_command)
543 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
544 pl, smtp_command, malfresp);
545 return FALSE;
546 }
547
548 /* Handle a failed filter process error; can't send QUIT as we mustn't
549 end the DATA. */
550
551 if (*errno_value == ERRNO_FILTER_FAIL)
552 {
553 *message = US string_sprintf("transport filter process failed (%d)%s",
554 more_errno,
555 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
556 return FALSE;
557 }
558
559 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
560 end the DATA. */
561
562 if (*errno_value == ERRNO_CHHEADER_FAIL)
563 {
564 *message =
565 US string_sprintf("failed to expand headers_add or headers_remove: %s",
566 expand_string_message);
567 return FALSE;
568 }
569
570 /* Handle failure to write a complete data block */
571
572 if (*errno_value == ERRNO_WRITEINCOMPLETE)
573 {
574 *message = US string_sprintf("failed to write a data block");
575 return FALSE;
576 }
577
578 #ifdef SUPPORT_I18N
579 /* Handle lack of advertised SMTPUTF8, for international message */
580 if (*errno_value == ERRNO_UTF8_FWD)
581 {
582 *message = US string_sprintf("utf8 support required but not offered for forwarding");
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
584 return TRUE;
585 }
586 #endif
587
588 /* Handle error responses from the remote mailer. */
589
590 if (buffer[0] != 0)
591 {
592 const uschar *s = string_printing(buffer);
593 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
594 "%s", pl, smtp_command, s);
595 *pass_message = TRUE;
596 *yield = buffer[0];
597 return TRUE;
598 }
599
600 /* No data was read. If there is no errno, this must be the EOF (i.e.
601 connection closed) case, which causes deferral. An explicit connection reset
602 error has the same effect. Otherwise, put the host's identity in the message,
603 leaving the errno value to be interpreted as well. In all cases, we have to
604 assume the connection is now dead. */
605
606 if (*errno_value == 0 || *errno_value == ECONNRESET)
607 {
608 *errno_value = ERRNO_SMTPCLOSED;
609 *message = US string_sprintf("Remote host closed connection "
610 "in response to %s%s", pl, smtp_command);
611 }
612 else *message = US string_sprintf("%s [%s]", host->name, host->address);
613
614 return FALSE;
615 }
616
617
618
619 /*************************************************
620 * Write error message to logs *
621 *************************************************/
622
623 /* This writes to the main log and to the message log.
624
625 Arguments:
626 addr the address item containing error information
627 host the current host
628
629 Returns: nothing
630 */
631
632 static void
633 write_logs(address_item *addr, host_item *host)
634 {
635 uschar * message = LOGGING(outgoing_port)
636 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
637 host->port == PORT_NONE ? 25 : host->port)
638 : string_sprintf("H=%s [%s]", host->name, host->address);
639
640 if (addr->message)
641 {
642 message = string_sprintf("%s: %s", message, addr->message);
643 if (addr->basic_errno > 0)
644 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
645 log_write(0, LOG_MAIN, "%s", message);
646 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
647 }
648 else
649 {
650 const uschar * s = exim_errstr(addr->basic_errno);
651 log_write(0, LOG_MAIN, "%s %s", message, s);
652 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
653 }
654 }
655
656 static void
657 msglog_line(host_item * host, uschar * message)
658 {
659 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
661 }
662
663
664
665 #ifndef DISABLE_EVENT
666 /*************************************************
667 * Post-defer action *
668 *************************************************/
669
670 /* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
672
673 Arguments:
674 addr the address item containing error information
675 host the current host
676
677 Returns: nothing
678 */
679
680 static void
681 deferred_event_raise(address_item *addr, host_item *host)
682 {
683 uschar * action = addr->transport->event_action;
684 const uschar * save_domain;
685 uschar * save_local;
686
687 if (!action)
688 return;
689
690 save_domain = deliver_domain;
691 save_local = deliver_localpart;
692
693 /*XXX would ip & port already be set up? */
694 deliver_host_address = string_copy(host->address);
695 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696 event_defer_errno = addr->basic_errno;
697
698 router_name = addr->router->name;
699 transport_name = addr->transport->name;
700 deliver_domain = addr->domain;
701 deliver_localpart = addr->local_part;
702
703 (void) event_raise(action, US"msg:host:defer",
704 addr->message
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
710 : NULL);
711
712 deliver_localpart = save_local;
713 deliver_domain = save_domain;
714 router_name = transport_name = NULL;
715 }
716 #endif
717
718 /*************************************************
719 * Synchronize SMTP responses *
720 *************************************************/
721
722 /* This function is called from smtp_deliver() to receive SMTP responses from
723 the server, and match them up with the commands to which they relate. When
724 PIPELINING is not in use, this function is called after every command, and is
725 therefore somewhat over-engineered, but it is simpler to use a single scheme
726 that works both with and without PIPELINING instead of having two separate sets
727 of code.
728
729 The set of commands that are buffered up with pipelining may start with MAIL
730 and may end with DATA; in between are RCPT commands that correspond to the
731 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732 etc.) are never buffered.
733
734 Errors after MAIL or DATA abort the whole process leaving the response in the
735 buffer. After MAIL, pending responses are flushed, and the original command is
736 re-instated in big_buffer for error messages. For RCPT commands, the remote is
737 permitted to reject some recipient addresses while accepting others. However
738 certain errors clearly abort the whole process. Set the value in
739 transport_return to PENDING_OK if the address is accepted. If there is a
740 subsequent general error, it will get reset accordingly. If not, it will get
741 converted to OK at the end.
742
743 Arguments:
744 addrlist the complete address list
745 include_affixes TRUE if affixes include in RCPT
746 sync_addr ptr to the ptr of the one to start scanning at (updated)
747 host the host we are connected to
748 count the number of responses to read
749 address_retry_
750 include_sender true if 4xx retry is to include the sender it its key
751 pending_MAIL true if the first response is for MAIL
752 pending_DATA 0 if last command sent was not DATA
753 +1 if previously had a good recipient
754 -1 if not previously had a good recipient
755 inblock incoming SMTP block
756 timeout timeout value
757 buffer buffer for reading response
758 buffsize size of buffer
759
760 Returns: 3 if at least one address had 2xx and one had 5xx
761 2 if at least one address had 5xx but none had 2xx
762 1 if at least one host had a 2xx response, but none had 5xx
763 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
764 -1 timeout while reading RCPT response
765 -2 I/O or other non-response error for RCPT
766 -3 DATA or MAIL failed - errno and buffer set
767 */
768
769 static int
770 sync_responses(address_item *addrlist, BOOL include_affixes,
771 address_item **sync_addr, host_item *host, int count,
772 BOOL address_retry_include_sender, BOOL pending_MAIL,
773 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
774 int buffsize)
775 {
776 address_item *addr = *sync_addr;
777 int yield = 0;
778
779 /* Handle the response for a MAIL command. On error, reinstate the original
780 command in big_buffer for error message use, and flush any further pending
781 responses before returning, except after I/O errors and timeouts. */
782
783 if (pending_MAIL)
784 {
785 count--;
786 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
787 {
788 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && buffer[0] != 0)
791 {
792 uschar flushbuffer[4096];
793 int save_errno = 0;
794 if (buffer[0] == '4')
795 {
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
798 }
799 while (count-- > 0)
800 {
801 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
802 '2', timeout)
803 && (errno != 0 || flushbuffer[0] == 0))
804 break;
805 }
806 errno = save_errno;
807 }
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
811 {
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = host;
814 addr = addr->next;
815 }
816 return -3;
817 }
818 }
819
820 if (pending_DATA) count--; /* Number of RCPT responses to come */
821
822 /* Read and handle the required number of RCPT responses, matching each one up
823 with an address by scanning for the next address whose status is PENDING_DEFER.
824 */
825
826 while (count-- > 0)
827 {
828 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
829
830 /* The address was accepted */
831 addr->host_used = host;
832
833 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
834 {
835 yield |= 1;
836 addr->transport_return = PENDING_OK;
837
838 /* If af_dr_retry_exists is set, there was a routing delay on this address;
839 ensure that any address-specific retry record is expunged. We do this both
840 for the basic key and for the version that also includes the sender. */
841
842 if (testflag(addr, af_dr_retry_exists))
843 {
844 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
845 sender_address);
846 retry_add_item(addr, altkey, rf_delete);
847 retry_add_item(addr, addr->address_retry_key, rf_delete);
848 }
849 }
850
851 /* Timeout while reading the response */
852
853 else if (errno == ETIMEDOUT)
854 {
855 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
856 transport_rcpt_address(addr, include_affixes));
857 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
858 retry_add_item(addr, addr->address_retry_key, 0);
859 update_waiting = FALSE;
860 return -1;
861 }
862
863 /* Handle other errors in obtaining an SMTP response by returning -1. This
864 will cause all the addresses to be deferred. Restore the SMTP command in
865 big_buffer for which we are checking the response, so the error message
866 makes sense. */
867
868 else if (errno != 0 || buffer[0] == 0)
869 {
870 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
871 transport_rcpt_address(addr, include_affixes));
872 return -2;
873 }
874
875 /* Handle SMTP permanent and temporary response codes. */
876
877 else
878 {
879 addr->message =
880 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
881 "%s", transport_rcpt_address(addr, include_affixes),
882 string_printing(buffer));
883 setflag(addr, af_pass_message);
884 msglog_line(host, addr->message);
885
886 /* The response was 5xx */
887
888 if (buffer[0] == '5')
889 {
890 addr->transport_return = FAIL;
891 yield |= 2;
892 }
893
894 /* The response was 4xx */
895
896 else
897 {
898 addr->transport_return = DEFER;
899 addr->basic_errno = ERRNO_RCPT4XX;
900 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
901
902 #ifndef DISABLE_EVENT
903 event_defer_errno = addr->more_errno;
904 msg_event_raise(US"msg:rcpt:host:defer", addr);
905 #endif
906
907 /* Log temporary errors if there are more hosts to be tried.
908 If not, log this last one in the == line. */
909
910 if (host->next)
911 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
912
913 #ifndef DISABLE_EVENT
914 else
915 msg_event_raise(US"msg:rcpt:defer", addr);
916 #endif
917
918 /* Do not put this message on the list of those waiting for specific
919 hosts, as otherwise it is likely to be tried too often. */
920
921 update_waiting = FALSE;
922
923 /* Add a retry item for the address so that it doesn't get tried again
924 too soon. If address_retry_include_sender is true, add the sender address
925 to the retry key. */
926
927 if (address_retry_include_sender)
928 {
929 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
930 sender_address);
931 retry_add_item(addr, altkey, 0);
932 }
933 else retry_add_item(addr, addr->address_retry_key, 0);
934 }
935 }
936 } /* Loop for next RCPT response */
937
938 /* Update where to start at for the next block of responses, unless we
939 have already handled all the addresses. */
940
941 if (addr != NULL) *sync_addr = addr->next;
942
943 /* Handle a response to DATA. If we have not had any good recipients, either
944 previously or in this block, the response is ignored. */
945
946 if (pending_DATA != 0 &&
947 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
948 {
949 int code;
950 uschar *msg;
951 BOOL pass_message;
952 if (pending_DATA > 0 || (yield & 1) != 0)
953 {
954 if (errno == 0 && buffer[0] == '4')
955 {
956 errno = ERRNO_DATA4XX;
957 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
958 }
959 return -3;
960 }
961 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
962 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
963 "is in use and there were no good recipients\n", msg);
964 }
965
966 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
967 present) received 3xx. If any RCPTs were handled and yielded anything other
968 than 4xx, yield will be set non-zero. */
969
970 return yield;
971 }
972
973
974
975 /* Do the client side of smtp-level authentication */
976 /*
977 Arguments:
978 buffer EHLO response from server (gets overwritten)
979 addrlist chain of potential addresses to deliver
980 host host to deliver to
981 ob transport options
982 ibp, obp comms channel control blocks
983
984 Returns:
985 OK Success, or failed (but not required): global "smtp_authenticated" set
986 DEFER Failed authentication (and was required)
987 ERROR Internal problem
988
989 FAIL_SEND Failed communications - transmit
990 FAIL - response
991 */
992
993 int
994 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
995 smtp_transport_options_block *ob, BOOL is_esmtp,
996 smtp_inblock *ibp, smtp_outblock *obp)
997 {
998 int require_auth;
999 uschar *fail_reason = US"server did not advertise AUTH support";
1000
1001 smtp_authenticated = FALSE;
1002 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1003 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1004
1005 if (is_esmtp && !regex_AUTH) regex_AUTH =
1006 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1007 FALSE, TRUE);
1008
1009 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1010 {
1011 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1012 expand_nmax = -1; /* reset */
1013
1014 /* Must not do this check until after we have saved the result of the
1015 regex match above. */
1016
1017 if (require_auth == OK ||
1018 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1019 {
1020 auth_instance *au;
1021 fail_reason = US"no common mechanisms were found";
1022
1023 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1024
1025 /* Scan the configured authenticators looking for one which is configured
1026 for use as a client, which is not suppressed by client_condition, and
1027 whose name matches an authentication mechanism supported by the server.
1028 If one is found, attempt to authenticate by calling its client function.
1029 */
1030
1031 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1032 {
1033 uschar *p = names;
1034 if (!au->client ||
1035 (au->client_condition != NULL &&
1036 !expand_check_condition(au->client_condition, au->name,
1037 US"client authenticator")))
1038 {
1039 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1040 au->name,
1041 (au->client)? "client_condition is false" :
1042 "not configured as a client");
1043 continue;
1044 }
1045
1046 /* Loop to scan supported server mechanisms */
1047
1048 while (*p != 0)
1049 {
1050 int rc;
1051 int len = Ustrlen(au->public_name);
1052 while (isspace(*p)) p++;
1053
1054 if (strncmpic(au->public_name, p, len) != 0 ||
1055 (p[len] != 0 && !isspace(p[len])))
1056 {
1057 while (*p != 0 && !isspace(*p)) p++;
1058 continue;
1059 }
1060
1061 /* Found data for a listed mechanism. Call its client entry. Set
1062 a flag in the outblock so that data is overwritten after sending so
1063 that reflections don't show it. */
1064
1065 fail_reason = US"authentication attempt(s) failed";
1066 obp->authenticating = TRUE;
1067 rc = (au->info->clientcode)(au, ibp, obp,
1068 ob->command_timeout, buffer, bufsize);
1069 obp->authenticating = FALSE;
1070 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1071 au->name, rc);
1072
1073 /* A temporary authentication failure must hold up delivery to
1074 this host. After a permanent authentication failure, we carry on
1075 to try other authentication methods. If all fail hard, try to
1076 deliver the message unauthenticated unless require_auth was set. */
1077
1078 switch(rc)
1079 {
1080 case OK:
1081 smtp_authenticated = TRUE; /* stops the outer loop */
1082 client_authenticator = au->name;
1083 if (au->set_client_id != NULL)
1084 client_authenticated_id = expand_string(au->set_client_id);
1085 break;
1086
1087 /* Failure after writing a command */
1088
1089 case FAIL_SEND:
1090 return FAIL_SEND;
1091
1092 /* Failure after reading a response */
1093
1094 case FAIL:
1095 if (errno != 0 || buffer[0] != '5') return FAIL;
1096 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1097 au->name, host->name, host->address, buffer);
1098 break;
1099
1100 /* Failure by some other means. In effect, the authenticator
1101 decided it wasn't prepared to handle this case. Typically this
1102 is the result of "fail" in an expansion string. Do we need to
1103 log anything here? Feb 2006: a message is now put in the buffer
1104 if logging is required. */
1105
1106 case CANCELLED:
1107 if (*buffer != 0)
1108 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1109 "authentication H=%s [%s] %s", au->name, host->name,
1110 host->address, buffer);
1111 break;
1112
1113 /* Internal problem, message in buffer. */
1114
1115 case ERROR:
1116 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1117 DEFER, FALSE);
1118 return ERROR;
1119 }
1120
1121 break; /* If not authenticated, try next authenticator */
1122 } /* Loop for scanning supported server mechanisms */
1123 } /* Loop for further authenticators */
1124 }
1125 }
1126
1127 /* If we haven't authenticated, but are required to, give up. */
1128
1129 if (require_auth == OK && !smtp_authenticated)
1130 {
1131 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1132 string_sprintf("authentication required but %s", fail_reason), DEFER,
1133 FALSE);
1134 return DEFER;
1135 }
1136
1137 return OK;
1138 }
1139
1140
1141 /* Construct AUTH appendix string for MAIL TO */
1142 /*
1143 Arguments
1144 buffer to build string
1145 addrlist chain of potential addresses to deliver
1146 ob transport options
1147
1148 Globals smtp_authenticated
1149 client_authenticated_sender
1150 Return True on error, otherwise buffer has (possibly empty) terminated string
1151 */
1152
1153 BOOL
1154 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1155 smtp_transport_options_block *ob)
1156 {
1157 uschar *local_authenticated_sender = authenticated_sender;
1158
1159 #ifdef notdef
1160 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1161 #endif
1162
1163 if (ob->authenticated_sender != NULL)
1164 {
1165 uschar *new = expand_string(ob->authenticated_sender);
1166 if (new == NULL)
1167 {
1168 if (!expand_string_forcedfail)
1169 {
1170 uschar *message = string_sprintf("failed to expand "
1171 "authenticated_sender: %s", expand_string_message);
1172 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1173 return TRUE;
1174 }
1175 }
1176 else if (new[0] != 0) local_authenticated_sender = new;
1177 }
1178
1179 /* Add the authenticated sender address if present */
1180
1181 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1182 local_authenticated_sender != NULL)
1183 {
1184 string_format(buffer, bufsize, " AUTH=%s",
1185 auth_xtextencode(local_authenticated_sender,
1186 Ustrlen(local_authenticated_sender)));
1187 client_authenticated_sender = string_copy(local_authenticated_sender);
1188 }
1189 else
1190 *buffer= 0;
1191
1192 return FALSE;
1193 }
1194
1195
1196
1197 #ifdef EXPERIMENTAL_DANE
1198 /* Lookup TLSA record for host/port.
1199 Return: OK success with dnssec; DANE mode
1200 DEFER Do not use this host now, may retry later
1201 FAIL_FORCED No TLSA record; DANE not usable
1202 FAIL Do not use this connection
1203 */
1204
1205 int
1206 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1207 {
1208 /* move this out to host.c given the similarity to dns_lookup() ? */
1209 uschar buffer[300];
1210 const uschar * fullname = buffer;
1211
1212 /* TLSA lookup string */
1213 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1214
1215 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1216 {
1217 case DNS_SUCCEED:
1218 if (!dns_is_secure(dnsa))
1219 {
1220 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1221 return DEFER;
1222 }
1223 return OK;
1224
1225 case DNS_AGAIN:
1226 return DEFER; /* just defer this TLS'd conn */
1227
1228 case DNS_NODATA: /* no TLSA RR for this lookup */
1229 case DNS_NOMATCH: /* no records at all for this lookup */
1230 return dane_required ? FAIL : FAIL_FORCED;
1231
1232 default:
1233 case DNS_FAIL:
1234 return dane_required ? FAIL : DEFER;
1235 }
1236 }
1237 #endif
1238
1239
1240
1241 typedef struct smtp_compare_s
1242 {
1243 uschar *current_sender_address;
1244 struct transport_instance *tblock;
1245 } smtp_compare_t;
1246
1247 /*
1248 Create a unique string that identifies this message, it is based on
1249 sender_address, helo_data and tls_certificate if enabled. */
1250
1251 static uschar *
1252 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1253 {
1254 address_item * addr1;
1255 uschar * if1 = US"";
1256 uschar * helo1 = US"";
1257 #ifdef SUPPORT_TLS
1258 uschar * tlsc1 = US"";
1259 #endif
1260 uschar * save_sender_address = sender_address;
1261 uschar * local_identity = NULL;
1262 smtp_transport_options_block * ob =
1263 (smtp_transport_options_block *)tblock->options_block;
1264
1265 sender_address = sender;
1266
1267 addr1 = deliver_make_addr (sender, TRUE);
1268 deliver_set_expansions(addr1);
1269
1270 if (ob->interface)
1271 if1 = expand_string(ob->interface);
1272
1273 if (ob->helo_data)
1274 helo1 = expand_string(ob->helo_data);
1275
1276 #ifdef SUPPORT_TLS
1277 if (ob->tls_certificate)
1278 tlsc1 = expand_string(ob->tls_certificate);
1279 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1280 #else
1281 local_identity = string_sprintf ("%s^%s", if1, helo1);
1282 #endif
1283
1284 deliver_set_expansions(NULL);
1285 sender_address = save_sender_address;
1286
1287 return local_identity;
1288 }
1289
1290
1291
1292 /* This routine is a callback that is called from transport_check_waiting.
1293 This function will evaluate the incoming message versus the previous
1294 message. If the incoming message is using a different local identity then
1295 we will veto this new message. */
1296
1297 static BOOL
1298 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1299 {
1300 uschar * message_local_identity,
1301 * current_local_identity,
1302 * new_sender_address;
1303
1304 current_local_identity =
1305 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1306
1307 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1308 return 0;
1309
1310 message_local_identity =
1311 smtp_local_identity(new_sender_address, s_compare->tblock);
1312
1313 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1314 }
1315
1316
1317
1318 uschar
1319 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1320 {
1321 #ifdef SUPPORT_TLS
1322 if ( checks & PEER_OFFERED_TLS
1323 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_TLS;
1325 #endif
1326
1327 if ( checks & PEER_OFFERED_IGNQ
1328 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1329 PCRE_EOPT, NULL, 0) < 0)
1330 checks &= ~PEER_OFFERED_IGNQ;
1331
1332 if ( checks & PEER_OFFERED_CHUNKING
1333 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_CHUNKING;
1335
1336 #ifndef DISABLE_PRDR
1337 if ( checks & PEER_OFFERED_PRDR
1338 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~PEER_OFFERED_PRDR;
1340 #endif
1341
1342 #ifdef SUPPORT_I18N
1343 if ( checks & PEER_OFFERED_UTF8
1344 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_UTF8;
1346 #endif
1347
1348 if ( checks & PEER_OFFERED_DSN
1349 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_DSN;
1351
1352 if ( checks & PEER_OFFERED_PIPE
1353 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1354 PCRE_EOPT, NULL, 0) < 0)
1355 checks &= ~PEER_OFFERED_PIPE;
1356
1357 if ( checks & PEER_OFFERED_SIZE
1358 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~PEER_OFFERED_SIZE;
1360
1361 return checks;
1362 }
1363
1364
1365
1366 /* Callback for emitting a BDAT data chunk header.
1367
1368 If given a nonzero size, first flush any buffered SMTP commands
1369 then emit the command.
1370
1371 Reap previous SMTP command responses if requested.
1372 Reap one SMTP command response if requested.
1373
1374 Returns: OK or ERROR
1375 */
1376
1377 static int
1378 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1379 unsigned chunk_size, unsigned flags)
1380 {
1381 smtp_transport_options_block * ob =
1382 (smtp_transport_options_block *)(tctx->tblock->options_block);
1383 int cmd_count = 0;
1384 int prev_cmd_count;
1385 uschar * buffer = tctx->buffer;
1386
1387
1388 /* Write SMTP chunk header command */
1389
1390 if (chunk_size > 0)
1391 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1392 chunk_size,
1393 flags & tc_chunk_last ? " LAST" : "")
1394 ) < 0) return ERROR;
1395
1396 prev_cmd_count = cmd_count += tctx->cmd_count;
1397
1398 /* Reap responses for any previous, but not one we just emitted */
1399
1400 if (chunk_size > 0)
1401 prev_cmd_count--;
1402 if (tctx->pending_BDAT)
1403 prev_cmd_count--;
1404
1405 if (flags & tc_reap_prev && prev_cmd_count > 0)
1406 {
1407 DEBUG(D_transport) debug_printf("look for %d responses"
1408 " for previous pipelined cmds\n", prev_cmd_count);
1409
1410 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1411 tctx->sync_addr, tctx->host, prev_cmd_count,
1412 ob->address_retry_include_sender,
1413 tctx->pending_MAIL, 0,
1414 tctx->inblock,
1415 ob->command_timeout,
1416 buffer, DELIVER_BUFFER_SIZE))
1417 {
1418 case 1: /* 2xx (only) => OK */
1419 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1420 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1421 case 0: break; /* No 2xx or 5xx, but no probs */
1422
1423 case -1: /* Timeout on RCPT */
1424 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1425 }
1426 cmd_count = 1;
1427 if (!tctx->pending_BDAT)
1428 pipelining_active = FALSE;
1429 }
1430
1431 /* Reap response for an outstanding BDAT */
1432
1433 if (tctx->pending_BDAT)
1434 {
1435 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1436
1437 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1438 ob->command_timeout))
1439 {
1440 if (errno == 0 && buffer[0] == '4')
1441 {
1442 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1443 tctx->first_addr->more_errno |=
1444 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1445 }
1446 return ERROR;
1447 }
1448 cmd_count--;
1449 tctx->pending_BDAT = FALSE;
1450 pipelining_active = FALSE;
1451 }
1452 else if (chunk_size > 0)
1453 tctx->pending_BDAT = TRUE;
1454
1455
1456 tctx->cmd_count = cmd_count;
1457 return OK;
1458 }
1459
1460
1461
1462 /*************************************************
1463 * Deliver address list to given host *
1464 *************************************************/
1465
1466 /* If continue_hostname is not null, we get here only when continuing to
1467 deliver down an existing channel. The channel was passed as the standard
1468 input. TLS is never active on a passed channel; the previous process always
1469 closes it down before passing the connection on.
1470
1471 Otherwise, we have to make a connection to the remote host, and do the
1472 initial protocol exchange.
1473
1474 When running as an MUA wrapper, if the sender or any recipient is rejected,
1475 temporarily or permanently, we force failure for all recipients.
1476
1477 Arguments:
1478 addrlist chain of potential addresses to deliver; only those whose
1479 transport_return field is set to PENDING_DEFER are currently
1480 being processed; others should be skipped - they have either
1481 been delivered to an earlier host or IP address, or been
1482 failed by one of them.
1483 host host to deliver to
1484 host_af AF_INET or AF_INET6
1485 port default TCP/IP port to use, in host byte order
1486 interface interface to bind to, or NULL
1487 tblock transport instance block
1488 message_defer set TRUE if yield is OK, but all addresses were deferred
1489 because of a non-recipient, non-host failure, that is, a
1490 4xx response to MAIL FROM, DATA, or ".". This is a defer
1491 that is specific to the message.
1492 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1493 a second attempt after TLS initialization fails
1494
1495 Returns: OK - the connection was made and the delivery attempted;
1496 the result for each address is in its data block.
1497 DEFER - the connection could not be made, or something failed
1498 while setting up the SMTP session, or there was a
1499 non-message-specific error, such as a timeout.
1500 ERROR - a filter command is specified for this transport,
1501 and there was a problem setting it up; OR helo_data
1502 or add_headers or authenticated_sender is specified
1503 for this transport, and the string failed to expand
1504 */
1505
1506 static int
1507 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1508 uschar *interface, transport_instance *tblock,
1509 BOOL *message_defer, BOOL suppress_tls)
1510 {
1511 address_item *addr;
1512 address_item *sync_addr;
1513 address_item *first_addr = addrlist;
1514 int yield = OK;
1515 int address_count;
1516 int save_errno;
1517 int rc;
1518 time_t start_delivery_time = time(NULL);
1519 smtp_transport_options_block *ob =
1520 (smtp_transport_options_block *)(tblock->options_block);
1521 struct lflags {
1522 BOOL lmtp:1;
1523 BOOL smtps:1;
1524 BOOL ok:1;
1525 BOOL send_rset:1;
1526 BOOL send_quit:1;
1527 BOOL setting_up:1;
1528 BOOL esmtp:1;
1529 BOOL esmtp_sent:1;
1530 BOOL pending_MAIL:1;
1531 #ifndef DISABLE_PRDR
1532 BOOL prdr_active:1;
1533 #endif
1534 #ifdef SUPPORT_I18N
1535 BOOL utf8_needed:1;
1536 #endif
1537 BOOL dsn_all_lasthop:1;
1538 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1539 BOOL dane:1;
1540 BOOL dane_required:1;
1541 #endif
1542 } lflags;
1543
1544 BOOL pass_message = FALSE;
1545 BOOL completed_address = FALSE;
1546 uschar peer_offered = 0;
1547 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1548 dns_answer tlsa_dnsa;
1549 #endif
1550 smtp_inblock inblock;
1551 smtp_outblock outblock;
1552 int max_rcpt = tblock->max_addresses;
1553 uschar *igquotstr = US"";
1554
1555 #ifdef EXPERIMENTAL_DSN_INFO
1556 uschar *smtp_greeting = NULL;
1557 uschar *helo_response = NULL;
1558 #endif
1559 uschar *helo_data = NULL;
1560
1561 uschar *message = NULL;
1562 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1563 uschar *p;
1564 uschar buffer[DELIVER_BUFFER_SIZE];
1565 uschar inbuffer[4096];
1566 uschar outbuffer[4096];
1567
1568 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1569
1570 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1571 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1572 lflags.ok = FALSE;
1573 lflags.send_rset = TRUE;
1574 lflags.send_quit = TRUE;
1575 lflags.setting_up = TRUE;
1576 lflags.esmtp = TRUE;
1577 lflags.esmtp_sent = FALSE;
1578 #ifdef SUPPORT_I18N
1579 lflags.utf8_needed = FALSE;
1580 #endif
1581 lflags.dsn_all_lasthop = TRUE;
1582 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1583 lflags.dane = FALSE;
1584 lflags.dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1585 #endif
1586
1587 *message_defer = FALSE;
1588 smtp_command = US"initial connection";
1589 buffer[0] = '\0';
1590 if (max_rcpt == 0) max_rcpt = 999999;
1591
1592 /* Set up the buffer for reading SMTP response packets. */
1593
1594 inblock.buffer = inbuffer;
1595 inblock.buffersize = sizeof(inbuffer);
1596 inblock.ptr = inbuffer;
1597 inblock.ptrend = inbuffer;
1598
1599 /* Set up the buffer for holding SMTP commands while pipelining */
1600
1601 outblock.buffer = outbuffer;
1602 outblock.buffersize = sizeof(outbuffer);
1603 outblock.ptr = outbuffer;
1604 outblock.cmd_count = 0;
1605 outblock.authenticating = FALSE;
1606
1607 /* Reset the parameters of a TLS session. */
1608
1609 tls_out.bits = 0;
1610 tls_out.cipher = NULL; /* the one we may use for this transport */
1611 tls_out.ourcert = NULL;
1612 tls_out.peercert = NULL;
1613 tls_out.peerdn = NULL;
1614 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1615 tls_out.sni = NULL;
1616 #endif
1617 tls_out.ocsp = OCSP_NOT_REQ;
1618
1619 /* Flip the legacy TLS-related variables over to the outbound set in case
1620 they're used in the context of the transport. Don't bother resetting
1621 afterward as we're in a subprocess. */
1622
1623 tls_modify_variables(&tls_out);
1624
1625 #ifndef SUPPORT_TLS
1626 if (lflags.smtps)
1627 {
1628 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1629 DEFER, FALSE);
1630 return ERROR;
1631 }
1632 #endif
1633
1634 /* Make a connection to the host if this isn't a continued delivery, and handle
1635 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1636 specially so they can be identified for retries. */
1637
1638 if (continue_hostname == NULL)
1639 {
1640 /* This puts port into host->port */
1641 inblock.sock = outblock.sock =
1642 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1643
1644 if (inblock.sock < 0)
1645 {
1646 set_errno_nohost(addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1647 NULL, DEFER, FALSE);
1648 return DEFER;
1649 }
1650
1651 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1652 {
1653 tls_out.dane_verified = FALSE;
1654 tls_out.tlsa_usage = 0;
1655
1656 if (host->dnssec == DS_YES)
1657 {
1658 if( lflags.dane_required
1659 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1660 )
1661 switch (rc = tlsa_lookup(host, &tlsa_dnsa, lflags.dane_required))
1662 {
1663 case OK: lflags.dane = TRUE; break;
1664 case FAIL_FORCED: break;
1665 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1666 string_sprintf("DANE error: tlsa lookup %s",
1667 rc == DEFER ? "DEFER" : "FAIL"),
1668 rc, FALSE);
1669 return rc;
1670 }
1671 }
1672 else if (lflags.dane_required)
1673 {
1674 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1675 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1676 FAIL, FALSE);
1677 return FAIL;
1678 }
1679
1680 if (lflags.dane)
1681 ob->tls_tempfail_tryclear = FALSE;
1682 }
1683 #endif /*DANE*/
1684
1685 /* Expand the greeting message while waiting for the initial response. (Makes
1686 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1687 delayed till here so that $sending_interface and $sending_port are set. */
1688
1689 helo_data = expand_string(ob->helo_data);
1690 #ifdef SUPPORT_I18N
1691 if (helo_data)
1692 {
1693 uschar * errstr = NULL;
1694 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1695 {
1696 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1697 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1698 yield = DEFER;
1699 goto SEND_QUIT;
1700 }
1701 }
1702 #endif
1703
1704 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1705 is nevertheless a reasonably clean way of programming this kind of logic,
1706 where you want to escape on any error. */
1707
1708 if (!lflags.smtps)
1709 {
1710 BOOL good_response;
1711
1712 #ifdef TCP_QUICKACK
1713 (void) setsockopt(inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1714 #endif
1715 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1716 '2', ob->command_timeout);
1717 #ifdef EXPERIMENTAL_DSN_INFO
1718 smtp_greeting = string_copy(buffer);
1719 #endif
1720 if (!good_response) goto RESPONSE_FAILED;
1721
1722 #ifndef DISABLE_EVENT
1723 {
1724 uschar * s;
1725 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1726 : host->dnssec==DS_NO ? US"no" : NULL;
1727 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1728 if (s)
1729 {
1730 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1731 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1732 DEFER, FALSE);
1733 yield = DEFER;
1734 goto SEND_QUIT;
1735 }
1736 }
1737 #endif
1738
1739 /* Now check if the helo_data expansion went well, and sign off cleanly if
1740 it didn't. */
1741
1742 if (!helo_data)
1743 {
1744 uschar *message = string_sprintf("failed to expand helo_data: %s",
1745 expand_string_message);
1746 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1747 yield = DEFER;
1748 goto SEND_QUIT;
1749 }
1750 }
1751
1752 /** Debugging without sending a message
1753 addrlist->transport_return = DEFER;
1754 goto SEND_QUIT;
1755 **/
1756
1757 /* Errors that occur after this point follow an SMTP command, which is
1758 left in big_buffer by smtp_write_command() for use in error messages. */
1759
1760 smtp_command = big_buffer;
1761
1762 /* Tell the remote who we are...
1763
1764 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1765 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1766 greeting is of this form. The assumption was that the far end supports it
1767 properly... but experience shows that there are some that give 5xx responses,
1768 even though the banner includes "ESMTP" (there's a bloody-minded one that
1769 says "ESMTP not spoken here"). Cope with that case.
1770
1771 September 2000: Time has passed, and it seems reasonable now to always send
1772 EHLO at the start. It is also convenient to make the change while installing
1773 the TLS stuff.
1774
1775 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1776 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1777 would be no way to send out the mails, so there is now a host list
1778 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1779 PIPELINING problem as well. Maybe it can also be useful to cure other
1780 problems with broken servers.
1781
1782 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1783 Then somebody tried it with a Microsoft mailer... It seems that all other
1784 mailers use upper case for some reason (the RFC is quite clear about case
1785 independence) so, for peace of mind, I gave in. */
1786
1787 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1788
1789 /* Alas; be careful, since this goto is not an error-out, so conceivably
1790 we might set data between here and the target which we assume to exist
1791 and be usable. I can see this coming back to bite us. */
1792 #ifdef SUPPORT_TLS
1793 if (lflags.smtps)
1794 {
1795 smtp_peer_options |= PEER_OFFERED_TLS;
1796 suppress_tls = FALSE;
1797 ob->tls_tempfail_tryclear = FALSE;
1798 smtp_command = US"SSL-on-connect";
1799 goto TLS_NEGOTIATE;
1800 }
1801 #endif
1802
1803 if (lflags.esmtp)
1804 {
1805 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1806 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1807 goto SEND_FAILED;
1808 lflags.esmtp_sent = TRUE;
1809 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1810 ob->command_timeout))
1811 {
1812 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1813 {
1814 #ifdef EXPERIMENTAL_DSN_INFO
1815 helo_response = string_copy(buffer);
1816 #endif
1817 goto RESPONSE_FAILED;
1818 }
1819 lflags.esmtp = FALSE;
1820 }
1821 #ifdef EXPERIMENTAL_DSN_INFO
1822 helo_response = string_copy(buffer);
1823 #endif
1824 }
1825 else
1826 DEBUG(D_transport)
1827 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1828
1829 if (!lflags.esmtp)
1830 {
1831 BOOL good_response;
1832 int n = sizeof(buffer);
1833 uschar * rsp = buffer;
1834
1835 if (lflags.esmtp_sent && (n = Ustrlen(buffer)) < sizeof(buffer)/2)
1836 { rsp = buffer + n + 1; n = sizeof(buffer) - n; }
1837
1838 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1839 goto SEND_FAILED;
1840 good_response = smtp_read_response(&inblock, rsp, n,
1841 '2', ob->command_timeout);
1842 #ifdef EXPERIMENTAL_DSN_INFO
1843 helo_response = string_copy(rsp);
1844 #endif
1845 if (!good_response)
1846 {
1847 /* Handle special logging for a closed connection after HELO
1848 when had previously sent EHLO */
1849
1850 if (rsp != buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1851 {
1852 message = NULL;
1853 lflags.send_quit = FALSE;
1854 save_errno = ERRNO_SMTPCLOSED;
1855 message = string_sprintf("Remote host closed connection "
1856 "in response to %s (EHLO response was: %s)",
1857 smtp_command, buffer);
1858 goto FAILED;
1859 }
1860 Ustrncpy(buffer, rsp, sizeof(buffer)/2);
1861 goto RESPONSE_FAILED;
1862 }
1863 }
1864
1865 peer_offered = smtp_peer_options = 0;
1866
1867 if (lflags.esmtp || lflags.lmtp)
1868 {
1869 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1870 PEER_OFFERED_TLS /* others checked later */
1871 );
1872
1873 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1874
1875 #ifdef SUPPORT_TLS
1876 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1877 #endif
1878 }
1879 }
1880
1881 /* For continuing deliveries down the same channel, the socket is the standard
1882 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1883 below). Set up the pointer to where subsequent commands will be left, for
1884 error messages. Note that smtp_peer_options will have been
1885 set from the command line if they were set in the process that passed the
1886 connection on. */
1887
1888 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1889 as the contine goes via transport_pass_socket() and doublefork and exec.
1890 It does not wait. Unclear how we keep separate host's responses
1891 separate - we could match up by host ip+port as a bodge. */
1892
1893 else
1894 {
1895 inblock.sock = outblock.sock = fileno(stdin);
1896 smtp_command = big_buffer;
1897 host->port = port; /* Record the port that was used */
1898 }
1899
1900 /* If TLS is available on this connection, whether continued or not, attempt to
1901 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1902 send another EHLO - the server may give a different answer in secure mode. We
1903 use a separate buffer for reading the response to STARTTLS so that if it is
1904 negative, the original EHLO data is available for subsequent analysis, should
1905 the client not be required to use TLS. If the response is bad, copy the buffer
1906 for error analysis. */
1907
1908 #ifdef SUPPORT_TLS
1909 if ( smtp_peer_options & PEER_OFFERED_TLS
1910 && !suppress_tls
1911 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1912 {
1913 uschar buffer2[4096];
1914 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1915 goto SEND_FAILED;
1916
1917 /* If there is an I/O error, transmission of this message is deferred. If
1918 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1919 false, we also defer. However, if there is a temporary rejection of STARTTLS
1920 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1921 STARTTLS, we carry on. This means we will try to send the message in clear,
1922 unless the host is in hosts_require_tls (tested below). */
1923
1924 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1925 ob->command_timeout))
1926 {
1927 if ( errno != 0
1928 || buffer2[0] == 0
1929 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1930 )
1931 {
1932 Ustrncpy(buffer, buffer2, sizeof(buffer));
1933 goto RESPONSE_FAILED;
1934 }
1935 }
1936
1937 /* STARTTLS accepted: try to negotiate a TLS session. */
1938
1939 else
1940 TLS_NEGOTIATE:
1941 {
1942 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1943 # ifdef EXPERIMENTAL_DANE
1944 , lflags.dane ? &tlsa_dnsa : NULL
1945 # endif
1946 );
1947
1948 /* TLS negotiation failed; give an error. From outside, this function may
1949 be called again to try in clear on a new connection, if the options permit
1950 it for this host. */
1951
1952 if (rc != OK)
1953 {
1954 # ifdef EXPERIMENTAL_DANE
1955 if (lflags.dane) log_write(0, LOG_MAIN,
1956 "DANE attempt failed; no TLS connection to %s [%s]",
1957 host->name, host->address);
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 fbuf[64];
2176 sprintf(CS fbuf, "%.50s transport", tblock->name);
2177 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2178 TRUE, DEFER, addrlist, fbuf, 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 if (lflags.send_quit)
3167 {
3168 shutdown(outblock.sock, SHUT_WR);
3169 for (rc = 16; read(inblock.sock, inbuffer, sizeof(inbuffer)) > 0 && rc > 0;)
3170 rc--; /* drain socket */
3171 }
3172 (void)close(inblock.sock);
3173
3174 #ifndef DISABLE_EVENT
3175 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3176 #endif
3177
3178 continue_transport = NULL;
3179 continue_hostname = NULL;
3180 return yield;
3181 }
3182
3183
3184
3185
3186 /*************************************************
3187 * Closedown entry point *
3188 *************************************************/
3189
3190 /* This function is called when exim is passed an open smtp channel
3191 from another incarnation, but the message which it has been asked
3192 to deliver no longer exists. The channel is on stdin.
3193
3194 We might do fancy things like looking for another message to send down
3195 the channel, but if the one we sought has gone, it has probably been
3196 delivered by some other process that itself will seek further messages,
3197 so just close down our connection.
3198
3199 Argument: pointer to the transport instance block
3200 Returns: nothing
3201 */
3202
3203 void
3204 smtp_transport_closedown(transport_instance *tblock)
3205 {
3206 smtp_transport_options_block *ob =
3207 (smtp_transport_options_block *)(tblock->options_block);
3208 smtp_inblock inblock;
3209 smtp_outblock outblock;
3210 uschar buffer[256];
3211 uschar inbuffer[4096];
3212 uschar outbuffer[16];
3213
3214 inblock.sock = fileno(stdin);
3215 inblock.buffer = inbuffer;
3216 inblock.buffersize = sizeof(inbuffer);
3217 inblock.ptr = inbuffer;
3218 inblock.ptrend = inbuffer;
3219
3220 outblock.sock = inblock.sock;
3221 outblock.buffersize = sizeof(outbuffer);
3222 outblock.buffer = outbuffer;
3223 outblock.ptr = outbuffer;
3224 outblock.cmd_count = 0;
3225 outblock.authenticating = FALSE;
3226
3227 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3228 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3229 ob->command_timeout);
3230 (void)close(inblock.sock);
3231 }
3232
3233
3234
3235 /*************************************************
3236 * Prepare addresses for delivery *
3237 *************************************************/
3238
3239 /* This function is called to flush out error settings from previous delivery
3240 attempts to other hosts. It also records whether we got here via an MX record
3241 or not in the more_errno field of the address. We are interested only in
3242 addresses that are still marked DEFER - others may have got delivered to a
3243 previously considered IP address. Set their status to PENDING_DEFER to indicate
3244 which ones are relevant this time.
3245
3246 Arguments:
3247 addrlist the list of addresses
3248 host the host we are delivering to
3249
3250 Returns: the first address for this delivery
3251 */
3252
3253 static address_item *
3254 prepare_addresses(address_item *addrlist, host_item *host)
3255 {
3256 address_item *first_addr = NULL;
3257 address_item *addr;
3258 for (addr = addrlist; addr; addr = addr->next)
3259 if (addr->transport_return == DEFER)
3260 {
3261 if (!first_addr) first_addr = addr;
3262 addr->transport_return = PENDING_DEFER;
3263 addr->basic_errno = 0;
3264 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3265 addr->message = NULL;
3266 #ifdef SUPPORT_TLS
3267 addr->cipher = NULL;
3268 addr->ourcert = NULL;
3269 addr->peercert = NULL;
3270 addr->peerdn = NULL;
3271 addr->ocsp = OCSP_NOT_REQ;
3272 #endif
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 addr->smtp_greeting = NULL;
3275 addr->helo_response = NULL;
3276 #endif
3277 }
3278 return first_addr;
3279 }
3280
3281
3282
3283 /*************************************************
3284 * Main entry point *
3285 *************************************************/
3286
3287 /* See local README for interface details. As this is a remote transport, it is
3288 given a chain of addresses to be delivered in one connection, if possible. It
3289 always returns TRUE, indicating that each address has its own independent
3290 status set, except if there is a setting up problem, in which case it returns
3291 FALSE. */
3292
3293 BOOL
3294 smtp_transport_entry(
3295 transport_instance *tblock, /* data for this instantiation */
3296 address_item *addrlist) /* addresses we are working on */
3297 {
3298 int cutoff_retry;
3299 int port;
3300 int hosts_defer = 0;
3301 int hosts_fail = 0;
3302 int hosts_looked_up = 0;
3303 int hosts_retry = 0;
3304 int hosts_serial = 0;
3305 int hosts_total = 0;
3306 int total_hosts_tried = 0;
3307 address_item *addr;
3308 BOOL expired = TRUE;
3309 uschar *expanded_hosts = NULL;
3310 uschar *pistring;
3311 uschar *tid = string_sprintf("%s transport", tblock->name);
3312 smtp_transport_options_block *ob =
3313 (smtp_transport_options_block *)(tblock->options_block);
3314 host_item *hostlist = addrlist->host_list;
3315 host_item *host = NULL;
3316
3317 DEBUG(D_transport)
3318 {
3319 debug_printf("%s transport entered\n", tblock->name);
3320 for (addr = addrlist; addr; addr = addr->next)
3321 debug_printf(" %s\n", addr->address);
3322 if (hostlist)
3323 {
3324 debug_printf("hostlist:\n");
3325 for (host = hostlist; host; host = host->next)
3326 debug_printf(" %s:%d\n", host->name, host->port);
3327 }
3328 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3329 continue_hostname, continue_host_address);
3330 }
3331
3332 /* Set the flag requesting that these hosts be added to the waiting
3333 database if the delivery fails temporarily or if we are running with
3334 queue_smtp or a 2-stage queue run. This gets unset for certain
3335 kinds of error, typically those that are specific to the message. */
3336
3337 update_waiting = TRUE;
3338
3339 /* If a host list is not defined for the addresses - they must all have the
3340 same one in order to be passed to a single transport - or if the transport has
3341 a host list with hosts_override set, use the host list supplied with the
3342 transport. It is an error for this not to exist. */
3343
3344 if (!hostlist || (ob->hosts_override && ob->hosts))
3345 {
3346 if (!ob->hosts)
3347 {
3348 addrlist->message = string_sprintf("%s transport called with no hosts set",
3349 tblock->name);
3350 addrlist->transport_return = PANIC;
3351 return FALSE; /* Only top address has status */
3352 }
3353
3354 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3355 ob->hosts);
3356
3357 /* If the transport's host list contains no '$' characters, and we are not
3358 randomizing, it is fixed and therefore a chain of hosts can be built once
3359 and for all, and remembered for subsequent use by other calls to this
3360 transport. If, on the other hand, the host list does contain '$', or we are
3361 randomizing its order, we have to rebuild it each time. In the fixed case,
3362 as the hosts string will never be used again, it doesn't matter that we
3363 replace all the : characters with zeros. */
3364
3365 if (!ob->hostlist)
3366 {
3367 uschar *s = ob->hosts;
3368
3369 if (Ustrchr(s, '$') != NULL)
3370 {
3371 if (!(expanded_hosts = expand_string(s)))
3372 {
3373 addrlist->message = string_sprintf("failed to expand list of hosts "
3374 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3375 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3376 return FALSE; /* Only top address has status */
3377 }
3378 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3379 "\"%s\"\n", s, expanded_hosts);
3380 s = expanded_hosts;
3381 }
3382 else
3383 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3384
3385 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3386
3387 /* Check that the expansion yielded something useful. */
3388 if (!hostlist)
3389 {
3390 addrlist->message =
3391 string_sprintf("%s transport has empty hosts setting", tblock->name);
3392 addrlist->transport_return = PANIC;
3393 return FALSE; /* Only top address has status */
3394 }
3395
3396 /* If there was no expansion of hosts, save the host list for
3397 next time. */
3398
3399 if (!expanded_hosts) ob->hostlist = hostlist;
3400 }
3401
3402 /* This is not the first time this transport has been run in this delivery;
3403 the host list was built previously. */
3404
3405 else
3406 hostlist = ob->hostlist;
3407 }
3408
3409 /* The host list was supplied with the address. If hosts_randomize is set, we
3410 must sort it into a random order if it did not come from MX records and has not
3411 already been randomized (but don't bother if continuing down an existing
3412 connection). */
3413
3414 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3415 {
3416 host_item *newlist = NULL;
3417 while (hostlist)
3418 {
3419 host_item *h = hostlist;
3420 hostlist = hostlist->next;
3421
3422 h->sort_key = random_number(100);
3423
3424 if (!newlist)
3425 {
3426 h->next = NULL;
3427 newlist = h;
3428 }
3429 else if (h->sort_key < newlist->sort_key)
3430 {
3431 h->next = newlist;
3432 newlist = h;
3433 }
3434 else
3435 {
3436 host_item *hh = newlist;
3437 while (hh->next)
3438 {
3439 if (h->sort_key < hh->next->sort_key) break;
3440 hh = hh->next;
3441 }
3442 h->next = hh->next;
3443 hh->next = h;
3444 }
3445 }
3446
3447 hostlist = addrlist->host_list = newlist;
3448 }
3449
3450 /* Sort out the default port. */
3451
3452 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3453
3454 /* For each host-plus-IP-address on the list:
3455
3456 . If this is a continued delivery and the host isn't the one with the
3457 current connection, skip.
3458
3459 . If the status is unusable (i.e. previously failed or retry checked), skip.
3460
3461 . If no IP address set, get the address, either by turning the name into
3462 an address, calling gethostbyname if gethostbyname is on, or by calling
3463 the DNS. The DNS may yield multiple addresses, in which case insert the
3464 extra ones into the list.
3465
3466 . Get the retry data if not previously obtained for this address and set the
3467 field which remembers the state of this address. Skip if the retry time is
3468 not reached. If not, remember whether retry data was found. The retry string
3469 contains both the name and the IP address.
3470
3471 . Scan the list of addresses and mark those whose status is DEFER as
3472 PENDING_DEFER. These are the only ones that will be processed in this cycle
3473 of the hosts loop.
3474
3475 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3476 Some addresses may be successfully delivered, others may fail, and yet
3477 others may get temporary errors and so get marked DEFER.
3478
3479 . The return from the delivery attempt is OK if a connection was made and a
3480 valid SMTP dialogue was completed. Otherwise it is DEFER.
3481
3482 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3483
3484 . If fail to connect, or other defer state, add a retry item.
3485
3486 . If there are any addresses whose status is still DEFER, carry on to the
3487 next host/IPaddress, unless we have tried the number of hosts given
3488 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3489 there is some fancy logic for hosts_max_try that means its limit can be
3490 overstepped in some circumstances.
3491
3492 If we get to the end of the list, all hosts have deferred at least one address,
3493 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3494 delivery attempt to those hosts whose last try was before the arrival time of
3495 the current message. To cope with this, we have to go round the loop a second
3496 time. After that, set the status and error data for any addresses that haven't
3497 had it set already. */
3498
3499 for (cutoff_retry = 0;
3500 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3501 cutoff_retry++)
3502 {
3503 host_item *nexthost = NULL;
3504 int unexpired_hosts_tried = 0;
3505
3506 for (host = hostlist;
3507 host
3508 && unexpired_hosts_tried < ob->hosts_max_try
3509 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3510 host = nexthost)
3511 {
3512 int rc;
3513 int host_af;
3514 uschar *rs;
3515 BOOL host_is_expired = FALSE;
3516 BOOL message_defer = FALSE;
3517 BOOL some_deferred = FALSE;
3518 address_item *first_addr = NULL;
3519 uschar *interface = NULL;
3520 uschar *retry_host_key = NULL;
3521 uschar *retry_message_key = NULL;
3522 uschar *serialize_key = NULL;
3523
3524 /* Default next host is next host. :-) But this can vary if the
3525 hosts_max_try limit is hit (see below). It may also be reset if a host
3526 address is looked up here (in case the host was multihomed). */
3527
3528 nexthost = host->next;
3529
3530 /* If the address hasn't yet been obtained from the host name, look it up
3531 now, unless the host is already marked as unusable. If it is marked as
3532 unusable, it means that the router was unable to find its IP address (in
3533 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3534 the lookup failed last time. We don't get this far if *all* MX records
3535 point to non-existent hosts; that is treated as a hard error.
3536
3537 We can just skip this host entirely. When the hosts came from the router,
3538 the address will timeout based on the other host(s); when the address is
3539 looked up below, there is an explicit retry record added.
3540
3541 Note that we mustn't skip unusable hosts if the address is not unset; they
3542 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3543
3544 if (!host->address)
3545 {
3546 int new_port, flags;
3547 host_item *hh;
3548
3549 if (host->status >= hstatus_unusable)
3550 {
3551 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3552 host->name);
3553 continue;
3554 }
3555
3556 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3557
3558 /* The host name is permitted to have an attached port. Find it, and
3559 strip it from the name. Just remember it for now. */
3560
3561 new_port = host_item_get_port(host);
3562
3563 /* Count hosts looked up */
3564
3565 hosts_looked_up++;
3566
3567 /* Find by name if so configured, or if it's an IP address. We don't
3568 just copy the IP address, because we need the test-for-local to happen. */
3569
3570 flags = HOST_FIND_BY_A;
3571 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3572 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3573
3574 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3575 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3576 else
3577 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3578 &ob->dnssec, /* domains for request/require */
3579 NULL, NULL);
3580
3581 /* Update the host (and any additional blocks, resulting from
3582 multihoming) with a host-specific port, if any. */
3583
3584 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3585
3586 /* Failure to find the host at this time (usually DNS temporary failure)
3587 is really a kind of routing failure rather than a transport failure.
3588 Therefore we add a retry item of the routing kind, not to stop us trying
3589 to look this name up here again, but to ensure the address gets timed
3590 out if the failures go on long enough. A complete failure at this point
3591 commonly points to a configuration error, but the best action is still
3592 to carry on for the next host. */
3593
3594 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3595 {
3596 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3597 expired = FALSE;
3598 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3599 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3600 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3601 host->status = hstatus_unusable;
3602
3603 for (addr = addrlist; addr; addr = addr->next)
3604 {
3605 if (addr->transport_return != DEFER) continue;
3606 addr->basic_errno = ERRNO_UNKNOWNHOST;
3607 addr->message =
3608 string_sprintf("failed to lookup IP address for %s", host->name);
3609 }
3610 continue;
3611 }
3612
3613 /* If the host is actually the local host, we may have a problem, or
3614 there may be some cunning configuration going on. In the problem case,
3615 log things and give up. The default transport status is already DEFER. */
3616
3617 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3618 {
3619 for (addr = addrlist; addr; addr = addr->next)
3620 {
3621 addr->basic_errno = 0;
3622 addr->message = string_sprintf("%s transport found host %s to be "
3623 "local", tblock->name, host->name);
3624 }
3625 goto END_TRANSPORT;
3626 }
3627 } /* End of block for IP address lookup */
3628
3629 /* If this is a continued delivery, we are interested only in the host
3630 which matches the name of the existing open channel. The check is put
3631 here after the local host lookup, in case the name gets expanded as a
3632 result of the lookup. Set expired FALSE, to save the outer loop executing
3633 twice. */
3634
3635 if ( continue_hostname
3636 && ( Ustrcmp(continue_hostname, host->name) != 0
3637 || Ustrcmp(continue_host_address, host->address) != 0
3638 ) )
3639 {
3640 expired = FALSE;
3641 continue; /* With next host */
3642 }
3643
3644 /* Reset the default next host in case a multihomed host whose addresses
3645 are not looked up till just above added to the host list. */
3646
3647 nexthost = host->next;
3648
3649 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3650 domain is in queue_smtp_domains, we don't actually want to attempt any
3651 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3652 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3653 were not in it. We don't want to hold up all SMTP deliveries! Except when
3654 doing a two-stage queue run, don't do this if forcing. */
3655
3656 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3657 match_isinlist(addrlist->domain,
3658 (const uschar **)&queue_smtp_domains, 0,
3659 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3660 {
3661 expired = FALSE;
3662 for (addr = addrlist; addr; addr = addr->next)
3663 if (addr->transport_return == DEFER)
3664 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3665 continue; /* With next host */
3666 }
3667
3668 /* Count hosts being considered - purely for an intelligent comment
3669 if none are usable. */
3670
3671 hosts_total++;
3672
3673 /* Set $host and $host address now in case they are needed for the
3674 interface expansion or the serialize_hosts check; they remain set if an
3675 actual delivery happens. */
3676
3677 deliver_host = host->name;
3678 deliver_host_address = host->address;
3679 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3680 : host->dnssec == DS_NO ? US"no"
3681 : US"";
3682
3683 /* Set up a string for adding to the retry key if the port number is not
3684 the standard SMTP port. A host may have its own port setting that overrides
3685 the default. */
3686
3687 pistring = string_sprintf(":%d", host->port == PORT_NONE
3688 ? port : host->port);
3689 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3690
3691 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3692 string is set, even if constant (as different transports can have different
3693 constant settings), we must add it to the key that is used for retries,
3694 because connections to the same host from a different interface should be
3695 treated separately. */
3696
3697 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3698 if ((rs = ob->interface) && *rs)
3699 {
3700 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3701 return FALSE;
3702 pistring = string_sprintf("%s/%s", pistring, interface);
3703 }
3704
3705 /* The first time round the outer loop, check the status of the host by
3706 inspecting the retry data. The second time round, we are interested only
3707 in expired hosts that haven't been tried since this message arrived. */
3708
3709 if (cutoff_retry == 0)
3710 {
3711 BOOL incl_ip;
3712 /* Ensure the status of the address is set by checking retry data if
3713 necessary. There may be host-specific retry data (applicable to all
3714 messages) and also data for retries of a specific message at this host.
3715 If either of these retry records are actually read, the keys used are
3716 returned to save recomputing them later. */
3717
3718 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3719 US"retry_include_ip_address", ob->retry_include_ip_address,
3720 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3721 continue; /* with next host */
3722
3723 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3724 incl_ip, &retry_host_key, &retry_message_key);
3725
3726 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3727 (host->address == NULL)? US"" : host->address, pistring,
3728 (host->status == hstatus_usable)? "usable" :
3729 (host->status == hstatus_unusable)? "unusable" :
3730 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3731
3732 /* Skip this address if not usable at this time, noting if it wasn't
3733 actually expired, both locally and in the address. */
3734
3735 switch (host->status)
3736 {
3737 case hstatus_unusable:
3738 expired = FALSE;
3739 setflag(addrlist, af_retry_skipped);
3740 /* Fall through */
3741
3742 case hstatus_unusable_expired:
3743 switch (host->why)
3744 {
3745 case hwhy_retry: hosts_retry++; break;
3746 case hwhy_failed: hosts_fail++; break;
3747 case hwhy_deferred: hosts_defer++; break;
3748 }
3749
3750 /* If there was a retry message key, implying that previously there
3751 was a message-specific defer, we don't want to update the list of
3752 messages waiting for these hosts. */
3753
3754 if (retry_message_key) update_waiting = FALSE;
3755 continue; /* With the next host or IP address */
3756 }
3757 }
3758
3759 /* Second time round the loop: if the address is set but expired, and
3760 the message is newer than the last try, let it through. */
3761
3762 else
3763 {
3764 if ( !host->address
3765 || host->status != hstatus_unusable_expired
3766 || host->last_try > received_time)
3767 continue;
3768 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3769 host->name, host->address, pistring);
3770 host_is_expired = TRUE;
3771 }
3772
3773 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3774 it remains TRUE only if all hosts are expired and none are actually tried.
3775 */
3776
3777 expired = FALSE;
3778
3779 /* If this host is listed as one to which access must be serialized,
3780 see if another Exim process has a connection to it, and if so, skip
3781 this host. If not, update the database to record our connection to it
3782 and remember this for later deletion. Do not do any of this if we are
3783 sending the message down a pre-existing connection. */
3784
3785 if ( !continue_hostname
3786 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3787 {
3788 serialize_key = string_sprintf("host-serialize-%s", host->name);
3789 if (!enq_start(serialize_key, 1))
3790 {
3791 DEBUG(D_transport)
3792 debug_printf("skipping host %s because another Exim process "
3793 "is connected to it\n", host->name);
3794 hosts_serial++;
3795 continue;
3796 }
3797 }
3798
3799 /* OK, we have an IP address that is not waiting for its retry time to
3800 arrive (it might be expired) OR (second time round the loop) we have an
3801 expired host that hasn't been tried since the message arrived. Have a go
3802 at delivering the message to it. First prepare the addresses by flushing
3803 out the result of previous attempts, and finding the first address that
3804 is still to be delivered. */
3805
3806 first_addr = prepare_addresses(addrlist, host);
3807
3808 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3809 message_id, host->name, host->address, addrlist->address,
3810 addrlist->next ? ", ..." : "");
3811
3812 set_process_info("delivering %s to %s [%s] (%s%s)",
3813 message_id, host->name, host->address, addrlist->address,
3814 addrlist->next ? ", ..." : "");
3815
3816 /* This is not for real; don't do the delivery. If there are
3817 any remaining hosts, list them. */
3818
3819 if (dont_deliver)
3820 {
3821 host_item *host2;
3822 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3823 for (addr = addrlist; addr; addr = addr->next)
3824 {
3825 addr->host_used = host;
3826 addr->special_action = '*';
3827 addr->message = US"delivery bypassed by -N option";
3828 }
3829 DEBUG(D_transport)
3830 {
3831 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3832 "*** host and remaining hosts:\n", tblock->name);
3833 for (host2 = host; host2; host2 = host2->next)
3834 debug_printf(" %s [%s]\n", host2->name,
3835 host2->address ? host2->address : US"unset");
3836 }
3837 rc = OK;
3838 }
3839
3840 /* This is for real. If the host is expired, we don't count it for
3841 hosts_max_retry. This ensures that all hosts must expire before an address
3842 is timed out, unless hosts_max_try_hardlimit (which protects against
3843 lunatic DNS configurations) is reached.
3844
3845 If the host is not expired and we are about to hit the hosts_max_retry
3846 limit, check to see if there is a subsequent hosts with a different MX
3847 value. If so, make that the next host, and don't count this one. This is a
3848 heuristic to make sure that different MXs do get tried. With a normal kind
3849 of retry rule, they would get tried anyway when the earlier hosts were
3850 delayed, but if the domain has a "retry every time" type of rule - as is
3851 often used for the the very large ISPs, that won't happen. */
3852
3853 else
3854 {
3855 host_item * thost;
3856 /* Make a copy of the host if it is local to this invocation
3857 of the transport. */
3858
3859 if (expanded_hosts)
3860 {
3861 thost = store_get(sizeof(host_item));
3862 *thost = *host;
3863 thost->name = string_copy(host->name);
3864 thost->address = string_copy(host->address);
3865 }
3866 else
3867 thost = host;
3868
3869 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3870 {
3871 host_item *h;
3872 DEBUG(D_transport)
3873 debug_printf("hosts_max_try limit reached with this host\n");
3874 for (h = host; h; h = h->next) if (h->mx != host->mx)
3875 {
3876 nexthost = h;
3877 unexpired_hosts_tried--;
3878 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3879 "and will be tried\n");
3880 break;
3881 }
3882 }
3883
3884 /* Attempt the delivery. */
3885
3886 total_hosts_tried++;
3887 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3888 &message_defer, FALSE);
3889
3890 /* Yield is one of:
3891 OK => connection made, each address contains its result;
3892 message_defer is set for message-specific defers (when all
3893 recipients are marked defer)
3894 DEFER => there was a non-message-specific delivery problem;
3895 ERROR => there was a problem setting up the arguments for a filter,
3896 or there was a problem with expanding added headers
3897 */
3898
3899 /* If the result is not OK, there was a non-message-specific problem.
3900 If the result is DEFER, we need to write to the logs saying what happened
3901 for this particular host, except in the case of authentication and TLS
3902 failures, where the log has already been written. If all hosts defer a
3903 general message is written at the end. */
3904
3905 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3906 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3907 write_logs(first_addr, host);
3908
3909 #ifndef DISABLE_EVENT
3910 if (rc == DEFER)
3911 deferred_event_raise(first_addr, host);
3912 #endif
3913
3914 /* If STARTTLS was accepted, but there was a failure in setting up the
3915 TLS session (usually a certificate screwup), and the host is not in
3916 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3917 TLS forcibly turned off. We have to start from scratch with a new SMTP
3918 connection. That's why the retry is done from here, not from within
3919 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3920 session, so the in-clear transmission after those errors, if permitted,
3921 happens inside smtp_deliver().] */
3922
3923 #ifdef SUPPORT_TLS
3924 if ( rc == DEFER
3925 && first_addr->basic_errno == ERRNO_TLSFAILURE
3926 && ob->tls_tempfail_tryclear
3927 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3928 )
3929 {
3930 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3931 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3932 first_addr = prepare_addresses(addrlist, host);
3933 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3934 &message_defer, TRUE);
3935 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3936 write_logs(first_addr, host);
3937 # ifndef DISABLE_EVENT
3938 if (rc == DEFER)
3939 deferred_event_raise(first_addr, host);
3940 # endif
3941 }
3942 #endif /*SUPPORT_TLS*/
3943 }
3944
3945 /* Delivery attempt finished */
3946
3947 rs = rc == OK ? US"OK"
3948 : rc == DEFER ? US"DEFER"
3949 : rc == ERROR ? US"ERROR"
3950 : US"?";
3951
3952 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3953 message_id, host->name, host->address, addrlist->address,
3954 addrlist->next ? " (& others)" : "", rs);
3955
3956 /* Release serialization if set up */
3957
3958 if (serialize_key) enq_end(serialize_key);
3959
3960 /* If the result is DEFER, or if a host retry record is known to exist, we
3961 need to add an item to the retry chain for updating the retry database
3962 at the end of delivery. We only need to add the item to the top address,
3963 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3964 for any other delivery attempts using the same address. (It is copied into
3965 the unusable tree at the outer level, so even if different address blocks
3966 contain the same address, it still won't get tried again.) */
3967
3968 if (rc == DEFER || retry_host_key)
3969 {
3970 int delete_flag = rc != DEFER ? rf_delete : 0;
3971 if (!retry_host_key)
3972 {
3973 BOOL incl_ip;
3974 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3975 US"retry_include_ip_address", ob->retry_include_ip_address,
3976 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3977 incl_ip = TRUE; /* error; use most-specific retry record */
3978
3979 retry_host_key = incl_ip
3980 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3981 : string_sprintf("T:%S%s", host->name, pistring);
3982 }
3983
3984 /* If a delivery of another message over an existing SMTP connection
3985 yields DEFER, we do NOT set up retry data for the host. This covers the
3986 case when there are delays in routing the addresses in the second message
3987 that are so long that the server times out. This is alleviated by not
3988 routing addresses that previously had routing defers when handling an
3989 existing connection, but even so, this case may occur (e.g. if a
3990 previously happily routed address starts giving routing defers). If the
3991 host is genuinely down, another non-continued message delivery will
3992 notice it soon enough. */
3993
3994 if (delete_flag != 0 || !continue_hostname)
3995 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3996
3997 /* We may have tried an expired host, if its retry time has come; ensure
3998 the status reflects the expiry for the benefit of any other addresses. */
3999
4000 if (rc == DEFER)
4001 {
4002 host->status = host_is_expired
4003 ? hstatus_unusable_expired : hstatus_unusable;
4004 host->why = hwhy_deferred;
4005 }
4006 }
4007
4008 /* If message_defer is set (host was OK, but every recipient got deferred
4009 because of some message-specific problem), or if that had happened
4010 previously so that a message retry key exists, add an appropriate item
4011 to the retry chain. Note that if there was a message defer but now there is
4012 a host defer, the message defer record gets deleted. That seems perfectly
4013 reasonable. Also, stop the message from being remembered as waiting
4014 for specific hosts. */
4015
4016 if (message_defer || retry_message_key)
4017 {
4018 int delete_flag = message_defer ? 0 : rf_delete;
4019 if (!retry_message_key)
4020 {
4021 BOOL incl_ip;
4022 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4023 US"retry_include_ip_address", ob->retry_include_ip_address,
4024 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4025 incl_ip = TRUE; /* error; use most-specific retry record */
4026
4027 retry_message_key = incl_ip
4028 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4029 message_id)
4030 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4031 }
4032 retry_add_item(addrlist, retry_message_key,
4033 rf_message | rf_host | delete_flag);
4034 update_waiting = FALSE;
4035 }
4036
4037 /* Any return other than DEFER (that is, OK or ERROR) means that the
4038 addresses have got their final statuses filled in for this host. In the OK
4039 case, see if any of them are deferred. */
4040
4041 if (rc == OK)
4042 for (addr = addrlist; addr; addr = addr->next)
4043 if (addr->transport_return == DEFER)
4044 {
4045 some_deferred = TRUE;
4046 break;
4047 }
4048
4049 /* If no addresses deferred or the result was ERROR, return. We do this for
4050 ERROR because a failing filter set-up or add_headers expansion is likely to
4051 fail for any host we try. */
4052
4053 if (rc == ERROR || (rc == OK && !some_deferred))
4054 {
4055 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4056 return TRUE; /* Each address has its status */
4057 }
4058
4059 /* If the result was DEFER or some individual addresses deferred, let
4060 the loop run to try other hosts with the deferred addresses, except for the
4061 case when we were trying to deliver down an existing channel and failed.
4062 Don't try any other hosts in this case. */
4063
4064 if (continue_hostname) break;
4065
4066 /* If the whole delivery, or some individual addresses, were deferred and
4067 there are more hosts that could be tried, do not count this host towards
4068 the hosts_max_try limit if the age of the message is greater than the
4069 maximum retry time for this host. This means we may try try all hosts,
4070 ignoring the limit, when messages have been around for some time. This is
4071 important because if we don't try all hosts, the address will never time
4072 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4073
4074 if ((rc == DEFER || some_deferred) && nexthost)
4075 {
4076 BOOL timedout;
4077 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4078
4079 if (retry && retry->rules)
4080 {
4081 retry_rule *last_rule;
4082 for (last_rule = retry->rules;
4083 last_rule->next;
4084 last_rule = last_rule->next);
4085 timedout = time(NULL) - received_time > last_rule->timeout;
4086 }
4087 else timedout = TRUE; /* No rule => timed out */
4088
4089 if (timedout)
4090 {
4091 unexpired_hosts_tried--;
4092 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4093 "hosts_max_try (message older than host's retry time)\n");
4094 }
4095 }
4096 } /* End of loop for trying multiple hosts. */
4097
4098 /* This is the end of the loop that repeats iff expired is TRUE and
4099 ob->delay_after_cutoff is FALSE. The second time round we will
4100 try those hosts that haven't been tried since the message arrived. */
4101
4102 DEBUG(D_transport)
4103 {
4104 debug_printf("all IP addresses skipped or deferred at least one address\n");
4105 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4106 debug_printf("retrying IP addresses not tried since message arrived\n");
4107 }
4108 }
4109
4110
4111 /* Get here if all IP addresses are skipped or defer at least one address. In
4112 MUA wrapper mode, this will happen only for connection or other non-message-
4113 specific failures. Force the delivery status for all addresses to FAIL. */
4114
4115 if (mua_wrapper)
4116 {
4117 for (addr = addrlist; addr; addr = addr->next)
4118 addr->transport_return = FAIL;
4119 goto END_TRANSPORT;
4120 }
4121
4122 /* In the normal, non-wrapper case, add a standard message to each deferred
4123 address if there hasn't been an error, that is, if it hasn't actually been
4124 tried this time. The variable "expired" will be FALSE if any deliveries were
4125 actually tried, or if there was at least one host that was not expired. That
4126 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4127 a delivery has been tried, an error code will be set, and the failing of the
4128 message is handled by the retry code later.
4129
4130 If queue_smtp is set, or this transport was called to send a subsequent message
4131 down an existing TCP/IP connection, and something caused the host not to be
4132 found, we end up here, but can detect these cases and handle them specially. */
4133
4134 for (addr = addrlist; addr; addr = addr->next)
4135 {
4136 /* If host is not NULL, it means that we stopped processing the host list
4137 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4138 means we need to behave as if some hosts were skipped because their retry
4139 time had not come. Specifically, this prevents the address from timing out.
4140 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4141 hosts were tried. */
4142
4143 if (host)
4144 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4145 {
4146 DEBUG(D_transport)
4147 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4148 "hosts were tried\n");
4149 }
4150 else
4151 {
4152 DEBUG(D_transport)
4153 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4154 setflag(addr, af_retry_skipped);
4155 }
4156
4157 if (queue_smtp) /* no deliveries attempted */
4158 {
4159 addr->transport_return = DEFER;
4160 addr->basic_errno = 0;
4161 addr->message = US"SMTP delivery explicitly queued";
4162 }
4163
4164 else if ( addr->transport_return == DEFER
4165 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4166 && !addr->message
4167 )
4168 {
4169 addr->basic_errno = ERRNO_HRETRY;
4170 if (continue_hostname)
4171 addr->message = US"no host found for existing SMTP connection";
4172 else if (expired)
4173 {
4174 setflag(addr, af_pass_message); /* This is not a security risk */
4175 addr->message = string_sprintf(
4176 "all hosts%s have been failing for a long time %s",
4177 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4178 ob->delay_after_cutoff
4179 ? US"(and retry time not reached)"
4180 : US"and were last tried after this message arrived");
4181
4182 /* If we are already using fallback hosts, or there are no fallback hosts
4183 defined, convert the result to FAIL to cause a bounce. */
4184
4185 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4186 addr->transport_return = FAIL;
4187 }
4188 else
4189 {
4190 const char * s;
4191 if (hosts_retry == hosts_total)
4192 s = "retry time not reached for any host%s";
4193 else if (hosts_fail == hosts_total)
4194 s = "all host address lookups%s failed permanently";
4195 else if (hosts_defer == hosts_total)
4196 s = "all host address lookups%s failed temporarily";
4197 else if (hosts_serial == hosts_total)
4198 s = "connection limit reached for all hosts%s";
4199 else if (hosts_fail+hosts_defer == hosts_total)
4200 s = "all host address lookups%s failed";
4201 else
4202 s = "some host address lookups failed and retry time "
4203 "not reached for other hosts or connection limit reached%s";
4204
4205 addr->message = string_sprintf(s,
4206 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4207 }
4208 }
4209 }
4210
4211 /* Update the database which keeps information about which messages are waiting
4212 for which hosts to become available. For some message-specific errors, the
4213 update_waiting flag is turned off because we don't want follow-on deliveries in
4214 those cases. If this transport instance is explicitly limited to one message
4215 per connection then follow-on deliveries are not possible and there's no need
4216 to create/update the per-transport wait-<transport_name> database. */
4217
4218 if (update_waiting && tblock->connection_max_messages != 1)
4219 transport_update_waiting(hostlist, tblock->name);
4220
4221 END_TRANSPORT:
4222
4223 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4224
4225 return TRUE; /* Each address has its status */
4226 }
4227
4228 /* vi: aw ai sw=2
4229 */
4230 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.