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