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Reduce space used by flags in smtp transport
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15 #define DELIVER_BUFFER_SIZE 4096
16
17
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
28
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
60 #endif
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
85 #ifdef SUPPORT_TLS
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
88 #endif
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
93 #ifdef SUPPORT_TLS
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 #ifndef DISABLE_PRDR
128 { "hosts_try_prdr", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 #endif
131 #ifdef SUPPORT_TLS
132 { "hosts_verify_avoid_tls", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
134 #endif
135 { "interface", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, interface) },
137 { "keepalive", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, keepalive) },
139 { "lmtp_ignore_quota", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
141 { "max_rcpt", opt_int | opt_public,
142 (void *)offsetof(transport_instance, max_addresses) },
143 { "multi_domain", opt_expand_bool | opt_public,
144 (void *)offsetof(transport_instance, multi_domain) },
145 { "port", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, port) },
147 { "protocol", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, protocol) },
149 { "retry_include_ip_address", opt_expand_bool,
150 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
151 { "serialize_hosts", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
153 { "size_addition", opt_int,
154 (void *)offsetof(smtp_transport_options_block, size_addition) }
155 #ifdef SUPPORT_SOCKS
156 ,{ "socks_proxy", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 #endif
159 #ifdef SUPPORT_TLS
160 ,{ "tls_certificate", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
162 { "tls_crl", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_crl) },
164 { "tls_dh_min_bits", opt_int,
165 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
166 { "tls_privatekey", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
168 { "tls_require_ciphers", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
170 { "tls_sni", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_sni) },
172 { "tls_tempfail_tryclear", opt_bool,
173 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
174 { "tls_try_verify_hosts", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
176 { "tls_verify_cert_hostnames", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
178 { "tls_verify_certificates", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
182 #endif
183 };
184
185 /* Size of the options list. An extern variable has to be used so that its
186 address can appear in the tables drtables.c. */
187
188 int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
190
191 /* Default private options block for the smtp transport. */
192
193 smtp_transport_options_block smtp_transport_option_defaults = {
194 NULL, /* hosts */
195 NULL, /* fallback_hosts */
196 NULL, /* hostlist */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
201 NULL, /* port */
202 US"smtp", /* protocol */
203 NULL, /* DSCP */
204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
207 US"*", /* hosts_try_chunking */
208 #ifdef EXPERIMENTAL_DANE
209 NULL, /* hosts_try_dane */
210 NULL, /* hosts_require_dane */
211 #endif
212 #ifndef DISABLE_PRDR
213 US"*", /* hosts_try_prdr */
214 #endif
215 #ifndef DISABLE_OCSP
216 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
217 NULL, /* hosts_require_ocsp */
218 #endif
219 NULL, /* hosts_require_tls */
220 NULL, /* hosts_avoid_tls */
221 NULL, /* hosts_verify_avoid_tls */
222 NULL, /* hosts_avoid_pipelining */
223 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 5*60, /* command_timeout */
226 5*60, /* connect_timeout; shorter system default overrides */
227 5*60, /* data timeout */
228 10*60, /* final timeout */
229 1024, /* size_addition */
230 5, /* hosts_max_try */
231 50, /* hosts_max_try_hardlimit */
232 TRUE, /* address_retry_include_sender */
233 FALSE, /* allow_localhost */
234 FALSE, /* authenticated_sender_force */
235 FALSE, /* gethostbyname */
236 TRUE, /* dns_qualify_single */
237 FALSE, /* dns_search_parents */
238 { NULL, NULL }, /* dnssec_domains {request,require} */
239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
243 FALSE, /* lmtp_ignore_quota */
244 NULL, /* expand_retry_include_ip_address */
245 TRUE /* retry_include_ip_address */
246 #ifdef SUPPORT_SOCKS
247 ,NULL /* socks_proxy */
248 #endif
249 #ifdef SUPPORT_TLS
250 ,NULL, /* tls_certificate */
251 NULL, /* tls_crl */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
254 NULL, /* tls_sni */
255 US"system", /* tls_verify_certificates */
256 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
257 /* tls_dh_min_bits */
258 TRUE, /* tls_tempfail_tryclear */
259 NULL, /* tls_verify_hosts */
260 US"*", /* tls_try_verify_hosts */
261 US"*" /* tls_verify_cert_hostnames */
262 #endif
263 #ifndef DISABLE_DKIM
264 , {NULL, /* dkim_canon */
265 NULL, /* dkim_domain */
266 NULL, /* dkim_private_key */
267 NULL, /* dkim_selector */
268 NULL, /* dkim_sign_headers */
269 NULL, /* dkim_strict */
270 FALSE} /* dot_stuffed */
271 #endif
272 };
273
274 /* some DSN flags for use later */
275
276 static int rf_list[] = {rf_notify_never, rf_notify_success,
277 rf_notify_failure, rf_notify_delay };
278
279 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
280
281
282
283 /* Local statics */
284
285 static uschar *smtp_command; /* Points to last cmd for error messages */
286 static uschar *mail_command; /* Points to MAIL cmd for error messages */
287 static BOOL update_waiting; /* TRUE to update the "wait" database */
288 static BOOL pipelining_active; /* current transaction is in pipe mode */
289
290
291 /*************************************************
292 * Setup entry point *
293 *************************************************/
294
295 /* This function is called when the transport is about to be used,
296 but before running it in a sub-process. It is used for two things:
297
298 (1) To set the fallback host list in addresses, when delivering.
299 (2) To pass back the interface, port, protocol, and other options, for use
300 during callout verification.
301
302 Arguments:
303 tblock pointer to the transport instance block
304 addrlist list of addresses about to be transported
305 tf if not NULL, pointer to block in which to return options
306 uid the uid that will be set (not used)
307 gid the gid that will be set (not used)
308 errmsg place for error message (not used)
309
310 Returns: OK always (FAIL, DEFER not used)
311 */
312
313 static int
314 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
315 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
316 {
317 smtp_transport_options_block *ob =
318 (smtp_transport_options_block *)(tblock->options_block);
319
320 errmsg = errmsg; /* Keep picky compilers happy */
321 uid = uid;
322 gid = gid;
323
324 /* Pass back options if required. This interface is getting very messy. */
325
326 if (tf != NULL)
327 {
328 tf->interface = ob->interface;
329 tf->port = ob->port;
330 tf->protocol = ob->protocol;
331 tf->hosts = ob->hosts;
332 tf->hosts_override = ob->hosts_override;
333 tf->hosts_randomize = ob->hosts_randomize;
334 tf->gethostbyname = ob->gethostbyname;
335 tf->qualify_single = ob->dns_qualify_single;
336 tf->search_parents = ob->dns_search_parents;
337 tf->helo_data = ob->helo_data;
338 }
339
340 /* Set the fallback host list for all the addresses that don't have fallback
341 host lists, provided that the local host wasn't present in the original host
342 list. */
343
344 if (!testflag(addrlist, af_local_host_removed))
345 {
346 for (; addrlist != NULL; addrlist = addrlist->next)
347 if (addrlist->fallback_hosts == NULL)
348 addrlist->fallback_hosts = ob->fallback_hostlist;
349 }
350
351 return OK;
352 }
353
354
355
356 /*************************************************
357 * Initialization entry point *
358 *************************************************/
359
360 /* Called for each instance, after its options have been read, to
361 enable consistency checks to be done, or anything else that needs
362 to be set up.
363
364 Argument: pointer to the transport instance block
365 Returns: nothing
366 */
367
368 void
369 smtp_transport_init(transport_instance *tblock)
370 {
371 smtp_transport_options_block *ob =
372 (smtp_transport_options_block *)(tblock->options_block);
373
374 /* Retry_use_local_part defaults FALSE if unset */
375
376 if (tblock->retry_use_local_part == TRUE_UNSET)
377 tblock->retry_use_local_part = FALSE;
378
379 /* Set the default port according to the protocol */
380
381 if (ob->port == NULL)
382 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
383 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
384
385 /* Set up the setup entry point, to be called before subprocesses for this
386 transport. */
387
388 tblock->setup = smtp_transport_setup;
389
390 /* Complain if any of the timeouts are zero. */
391
392 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
393 ob->final_timeout <= 0)
394 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
395 "command, data, or final timeout value is zero for %s transport",
396 tblock->name);
397
398 /* If hosts_override is set and there are local hosts, set the global
399 flag that stops verify from showing router hosts. */
400
401 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
402
403 /* If there are any fallback hosts listed, build a chain of host items
404 for them, but do not do any lookups at this time. */
405
406 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
407 }
408
409
410
411
412
413 /*************************************************
414 * Set delivery info into all active addresses *
415 *************************************************/
416
417 /* Only addresses whose status is >= PENDING are relevant. A lesser
418 status means that an address is not currently being processed.
419
420 Arguments:
421 addrlist points to a chain of addresses
422 errno_value to put in each address's errno field
423 msg to put in each address's message field
424 rc to put in each address's transport_return field
425 pass_message if TRUE, set the "pass message" flag in the address
426 host if set, mark addrs as having used this host
427 smtp_greeting from peer
428 helo_response from peer
429
430 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
431 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
432 this particular type of timeout.
433
434 Returns: nothing
435 */
436
437 static void
438 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
439 BOOL pass_message, host_item * host
440 #ifdef EXPERIMENTAL_DSN_INFO
441 , const uschar * smtp_greeting, const uschar * helo_response
442 #endif
443 )
444 {
445 address_item *addr;
446 int orvalue = 0;
447 if (errno_value == ERRNO_CONNECTTIMEOUT)
448 {
449 errno_value = ETIMEDOUT;
450 orvalue = RTEF_CTOUT;
451 }
452 for (addr = addrlist; addr; addr = addr->next)
453 if (addr->transport_return >= PENDING)
454 {
455 addr->basic_errno = errno_value;
456 addr->more_errno |= orvalue;
457 if (msg != NULL)
458 {
459 addr->message = msg;
460 if (pass_message) setflag(addr, af_pass_message);
461 }
462 addr->transport_return = rc;
463 if (host)
464 {
465 addr->host_used = host;
466 #ifdef EXPERIMENTAL_DSN_INFO
467 if (smtp_greeting)
468 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
469 addr->smtp_greeting = smtp_greeting;
470
471 if (helo_response)
472 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
473 addr->helo_response = helo_response;
474 #endif
475 }
476 }
477 }
478
479 static void
480 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
481 BOOL pass_message)
482 {
483 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
484 #ifdef EXPERIMENTAL_DSN_INFO
485 , NULL, NULL
486 #endif
487 );
488 }
489
490
491 /*************************************************
492 * Check an SMTP response *
493 *************************************************/
494
495 /* This function is given an errno code and the SMTP response buffer
496 to analyse, together with the host identification for generating messages. It
497 sets an appropriate message and puts the first digit of the response code into
498 the yield variable. If no response was actually read, a suitable digit is
499 chosen.
500
501 Arguments:
502 host the current host, to get its name for messages
503 errno_value pointer to the errno value
504 more_errno from the top address for use with ERRNO_FILTER_FAIL
505 buffer the SMTP response buffer
506 yield where to put a one-digit SMTP response code
507 message where to put an errror message
508 pass_message set TRUE if message is an SMTP response
509
510 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
511 */
512
513 static BOOL
514 check_response(host_item *host, int *errno_value, int more_errno,
515 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
516 {
517 uschar * pl = pipelining_active ? US"pipelined " : US"";
518
519 *yield = '4'; /* Default setting is to give a temporary error */
520
521 /* Handle response timeout */
522
523 if (*errno_value == ETIMEDOUT)
524 {
525 *message = US string_sprintf("SMTP timeout after %s%s",
526 pl, smtp_command);
527 if (transport_count > 0)
528 *message = US string_sprintf("%s (%d bytes written)", *message,
529 transport_count);
530 return FALSE;
531 }
532
533 /* Handle malformed SMTP response */
534
535 if (*errno_value == ERRNO_SMTPFORMAT)
536 {
537 const uschar *malfresp = string_printing(buffer);
538 while (isspace(*malfresp)) malfresp++;
539 *message = *malfresp == 0
540 ? string_sprintf("Malformed SMTP reply (an empty line) "
541 "in response to %s%s", pl, smtp_command)
542 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
543 pl, smtp_command, malfresp);
544 return FALSE;
545 }
546
547 /* Handle a failed filter process error; can't send QUIT as we mustn't
548 end the DATA. */
549
550 if (*errno_value == ERRNO_FILTER_FAIL)
551 {
552 *message = US string_sprintf("transport filter process failed (%d)%s",
553 more_errno,
554 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
555 return FALSE;
556 }
557
558 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
559 end the DATA. */
560
561 if (*errno_value == ERRNO_CHHEADER_FAIL)
562 {
563 *message =
564 US string_sprintf("failed to expand headers_add or headers_remove: %s",
565 expand_string_message);
566 return FALSE;
567 }
568
569 /* Handle failure to write a complete data block */
570
571 if (*errno_value == ERRNO_WRITEINCOMPLETE)
572 {
573 *message = US string_sprintf("failed to write a data block");
574 return FALSE;
575 }
576
577 #ifdef SUPPORT_I18N
578 /* Handle lack of advertised SMTPUTF8, for international message */
579 if (*errno_value == ERRNO_UTF8_FWD)
580 {
581 *message = US string_sprintf("utf8 support required but not offered for forwarding");
582 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
583 return TRUE;
584 }
585 #endif
586
587 /* Handle error responses from the remote mailer. */
588
589 if (buffer[0] != 0)
590 {
591 const uschar *s = string_printing(buffer);
592 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s);
594 *pass_message = TRUE;
595 *yield = buffer[0];
596 return TRUE;
597 }
598
599 /* No data was read. If there is no errno, this must be the EOF (i.e.
600 connection closed) case, which causes deferral. An explicit connection reset
601 error has the same effect. Otherwise, put the host's identity in the message,
602 leaving the errno value to be interpreted as well. In all cases, we have to
603 assume the connection is now dead. */
604
605 if (*errno_value == 0 || *errno_value == ECONNRESET)
606 {
607 *errno_value = ERRNO_SMTPCLOSED;
608 *message = US string_sprintf("Remote host closed connection "
609 "in response to %s%s", pl, smtp_command);
610 }
611 else *message = US string_sprintf("%s [%s]", host->name, host->address);
612
613 return FALSE;
614 }
615
616
617
618 /*************************************************
619 * Write error message to logs *
620 *************************************************/
621
622 /* This writes to the main log and to the message log.
623
624 Arguments:
625 addr the address item containing error information
626 host the current host
627
628 Returns: nothing
629 */
630
631 static void
632 write_logs(address_item *addr, host_item *host)
633 {
634 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
635
636 if (LOGGING(outgoing_port))
637 message = string_sprintf("%s:%d", message,
638 host->port == PORT_NONE ? 25 : host->port);
639 if (addr->message)
640 {
641 message = string_sprintf("%s: %s", message, addr->message);
642 if (addr->basic_errno > 0)
643 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
644 log_write(0, LOG_MAIN, "%s", message);
645 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
646 }
647 else
648 {
649 const uschar * s = exim_errstr(addr->basic_errno);
650 log_write(0, LOG_MAIN, "%s %s", message, s);
651 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
652 }
653 }
654
655 static void
656 msglog_line(host_item * host, uschar * message)
657 {
658 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
659 host->name, host->address, message);
660 }
661
662
663
664 #ifndef DISABLE_EVENT
665 /*************************************************
666 * Post-defer action *
667 *************************************************/
668
669 /* This expands an arbitrary per-transport string.
670 It might, for example, be used to write to the database log.
671
672 Arguments:
673 addr the address item containing error information
674 host the current host
675
676 Returns: nothing
677 */
678
679 static void
680 deferred_event_raise(address_item *addr, host_item *host)
681 {
682 uschar * action = addr->transport->event_action;
683 const uschar * save_domain;
684 uschar * save_local;
685
686 if (!action)
687 return;
688
689 save_domain = deliver_domain;
690 save_local = deliver_localpart;
691
692 /*XXX would ip & port already be set up? */
693 deliver_host_address = string_copy(host->address);
694 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
695 event_defer_errno = addr->basic_errno;
696
697 router_name = addr->router->name;
698 transport_name = addr->transport->name;
699 deliver_domain = addr->domain;
700 deliver_localpart = addr->local_part;
701
702 (void) event_raise(action, US"msg:host:defer",
703 addr->message
704 ? addr->basic_errno > 0
705 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
706 : string_copy(addr->message)
707 : addr->basic_errno > 0
708 ? string_copy(US strerror(addr->basic_errno))
709 : NULL);
710
711 deliver_localpart = save_local;
712 deliver_domain = save_domain;
713 router_name = transport_name = NULL;
714 }
715 #endif
716
717 /*************************************************
718 * Synchronize SMTP responses *
719 *************************************************/
720
721 /* This function is called from smtp_deliver() to receive SMTP responses from
722 the server, and match them up with the commands to which they relate. When
723 PIPELINING is not in use, this function is called after every command, and is
724 therefore somewhat over-engineered, but it is simpler to use a single scheme
725 that works both with and without PIPELINING instead of having two separate sets
726 of code.
727
728 The set of commands that are buffered up with pipelining may start with MAIL
729 and may end with DATA; in between are RCPT commands that correspond to the
730 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
731 etc.) are never buffered.
732
733 Errors after MAIL or DATA abort the whole process leaving the response in the
734 buffer. After MAIL, pending responses are flushed, and the original command is
735 re-instated in big_buffer for error messages. For RCPT commands, the remote is
736 permitted to reject some recipient addresses while accepting others. However
737 certain errors clearly abort the whole process. Set the value in
738 transport_return to PENDING_OK if the address is accepted. If there is a
739 subsequent general error, it will get reset accordingly. If not, it will get
740 converted to OK at the end.
741
742 Arguments:
743 addrlist the complete address list
744 include_affixes TRUE if affixes include in RCPT
745 sync_addr ptr to the ptr of the one to start scanning at (updated)
746 host the host we are connected to
747 count the number of responses to read
748 address_retry_
749 include_sender true if 4xx retry is to include the sender it its key
750 pending_MAIL true if the first response is for MAIL
751 pending_DATA 0 if last command sent was not DATA
752 +1 if previously had a good recipient
753 -1 if not previously had a good recipient
754 inblock incoming SMTP block
755 timeout timeout value
756 buffer buffer for reading response
757 buffsize size of buffer
758
759 Returns: 3 if at least one address had 2xx and one had 5xx
760 2 if at least one address had 5xx but none had 2xx
761 1 if at least one host had a 2xx response, but none had 5xx
762 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
763 -1 timeout while reading RCPT response
764 -2 I/O or other non-response error for RCPT
765 -3 DATA or MAIL failed - errno and buffer set
766 */
767
768 static int
769 sync_responses(address_item *addrlist, BOOL include_affixes,
770 address_item **sync_addr, host_item *host, int count,
771 BOOL address_retry_include_sender, BOOL pending_MAIL,
772 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
773 int buffsize)
774 {
775 address_item *addr = *sync_addr;
776 int yield = 0;
777
778 /* Handle the response for a MAIL command. On error, reinstate the original
779 command in big_buffer for error message use, and flush any further pending
780 responses before returning, except after I/O errors and timeouts. */
781
782 if (pending_MAIL)
783 {
784 count--;
785 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
786 {
787 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
788 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
789 if (errno == 0 && buffer[0] != 0)
790 {
791 uschar flushbuffer[4096];
792 int save_errno = 0;
793 if (buffer[0] == '4')
794 {
795 save_errno = ERRNO_MAIL4XX;
796 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
797 }
798 while (count-- > 0)
799 {
800 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
801 '2', timeout)
802 && (errno != 0 || flushbuffer[0] == 0))
803 break;
804 }
805 errno = save_errno;
806 }
807
808 if (pending_DATA) count--; /* Number of RCPT responses to come */
809 while (count-- > 0) /* Mark any pending addrs with the host used */
810 {
811 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
812 addr->host_used = host;
813 addr = addr->next;
814 }
815 return -3;
816 }
817 }
818
819 if (pending_DATA) count--; /* Number of RCPT responses to come */
820
821 /* Read and handle the required number of RCPT responses, matching each one up
822 with an address by scanning for the next address whose status is PENDING_DEFER.
823 */
824
825 while (count-- > 0)
826 {
827 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
828
829 /* The address was accepted */
830 addr->host_used = host;
831
832 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
833 {
834 yield |= 1;
835 addr->transport_return = PENDING_OK;
836
837 /* If af_dr_retry_exists is set, there was a routing delay on this address;
838 ensure that any address-specific retry record is expunged. We do this both
839 for the basic key and for the version that also includes the sender. */
840
841 if (testflag(addr, af_dr_retry_exists))
842 {
843 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
844 sender_address);
845 retry_add_item(addr, altkey, rf_delete);
846 retry_add_item(addr, addr->address_retry_key, rf_delete);
847 }
848 }
849
850 /* Timeout while reading the response */
851
852 else if (errno == ETIMEDOUT)
853 {
854 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
855 transport_rcpt_address(addr, include_affixes));
856 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
857 retry_add_item(addr, addr->address_retry_key, 0);
858 update_waiting = FALSE;
859 return -1;
860 }
861
862 /* Handle other errors in obtaining an SMTP response by returning -1. This
863 will cause all the addresses to be deferred. Restore the SMTP command in
864 big_buffer for which we are checking the response, so the error message
865 makes sense. */
866
867 else if (errno != 0 || buffer[0] == 0)
868 {
869 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
870 transport_rcpt_address(addr, include_affixes));
871 return -2;
872 }
873
874 /* Handle SMTP permanent and temporary response codes. */
875
876 else
877 {
878 addr->message =
879 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
880 "%s", transport_rcpt_address(addr, include_affixes),
881 string_printing(buffer));
882 setflag(addr, af_pass_message);
883 msglog_line(host, addr->message);
884
885 /* The response was 5xx */
886
887 if (buffer[0] == '5')
888 {
889 addr->transport_return = FAIL;
890 yield |= 2;
891 }
892
893 /* The response was 4xx */
894
895 else
896 {
897 addr->transport_return = DEFER;
898 addr->basic_errno = ERRNO_RCPT4XX;
899 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
900
901 #ifndef DISABLE_EVENT
902 event_defer_errno = addr->more_errno;
903 msg_event_raise(US"msg:rcpt:host:defer", addr);
904 #endif
905
906 /* Log temporary errors if there are more hosts to be tried.
907 If not, log this last one in the == line. */
908
909 if (host->next)
910 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
911
912 #ifndef DISABLE_EVENT
913 else
914 msg_event_raise(US"msg:rcpt:defer", addr);
915 #endif
916
917 /* Do not put this message on the list of those waiting for specific
918 hosts, as otherwise it is likely to be tried too often. */
919
920 update_waiting = FALSE;
921
922 /* Add a retry item for the address so that it doesn't get tried again
923 too soon. If address_retry_include_sender is true, add the sender address
924 to the retry key. */
925
926 if (address_retry_include_sender)
927 {
928 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
929 sender_address);
930 retry_add_item(addr, altkey, 0);
931 }
932 else retry_add_item(addr, addr->address_retry_key, 0);
933 }
934 }
935 } /* Loop for next RCPT response */
936
937 /* Update where to start at for the next block of responses, unless we
938 have already handled all the addresses. */
939
940 if (addr != NULL) *sync_addr = addr->next;
941
942 /* Handle a response to DATA. If we have not had any good recipients, either
943 previously or in this block, the response is ignored. */
944
945 if (pending_DATA != 0 &&
946 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
947 {
948 int code;
949 uschar *msg;
950 BOOL pass_message;
951 if (pending_DATA > 0 || (yield & 1) != 0)
952 {
953 if (errno == 0 && buffer[0] == '4')
954 {
955 errno = ERRNO_DATA4XX;
956 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
957 }
958 return -3;
959 }
960 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
961 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
962 "is in use and there were no good recipients\n", msg);
963 }
964
965 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
966 present) received 3xx. If any RCPTs were handled and yielded anything other
967 than 4xx, yield will be set non-zero. */
968
969 return yield;
970 }
971
972
973
974 /* Do the client side of smtp-level authentication */
975 /*
976 Arguments:
977 buffer EHLO response from server (gets overwritten)
978 addrlist chain of potential addresses to deliver
979 host host to deliver to
980 ob transport options
981 ibp, obp comms channel control blocks
982
983 Returns:
984 OK Success, or failed (but not required): global "smtp_authenticated" set
985 DEFER Failed authentication (and was required)
986 ERROR Internal problem
987
988 FAIL_SEND Failed communications - transmit
989 FAIL - response
990 */
991
992 int
993 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
994 smtp_transport_options_block *ob, BOOL is_esmtp,
995 smtp_inblock *ibp, smtp_outblock *obp)
996 {
997 int require_auth;
998 uschar *fail_reason = US"server did not advertise AUTH support";
999
1000 smtp_authenticated = FALSE;
1001 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1002 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1003
1004 if (is_esmtp && !regex_AUTH) regex_AUTH =
1005 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1006 FALSE, TRUE);
1007
1008 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1009 {
1010 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1011 expand_nmax = -1; /* reset */
1012
1013 /* Must not do this check until after we have saved the result of the
1014 regex match above. */
1015
1016 if (require_auth == OK ||
1017 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1018 {
1019 auth_instance *au;
1020 fail_reason = US"no common mechanisms were found";
1021
1022 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1023
1024 /* Scan the configured authenticators looking for one which is configured
1025 for use as a client, which is not suppressed by client_condition, and
1026 whose name matches an authentication mechanism supported by the server.
1027 If one is found, attempt to authenticate by calling its client function.
1028 */
1029
1030 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1031 {
1032 uschar *p = names;
1033 if (!au->client ||
1034 (au->client_condition != NULL &&
1035 !expand_check_condition(au->client_condition, au->name,
1036 US"client authenticator")))
1037 {
1038 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1039 au->name,
1040 (au->client)? "client_condition is false" :
1041 "not configured as a client");
1042 continue;
1043 }
1044
1045 /* Loop to scan supported server mechanisms */
1046
1047 while (*p != 0)
1048 {
1049 int rc;
1050 int len = Ustrlen(au->public_name);
1051 while (isspace(*p)) p++;
1052
1053 if (strncmpic(au->public_name, p, len) != 0 ||
1054 (p[len] != 0 && !isspace(p[len])))
1055 {
1056 while (*p != 0 && !isspace(*p)) p++;
1057 continue;
1058 }
1059
1060 /* Found data for a listed mechanism. Call its client entry. Set
1061 a flag in the outblock so that data is overwritten after sending so
1062 that reflections don't show it. */
1063
1064 fail_reason = US"authentication attempt(s) failed";
1065 obp->authenticating = TRUE;
1066 rc = (au->info->clientcode)(au, ibp, obp,
1067 ob->command_timeout, buffer, bufsize);
1068 obp->authenticating = FALSE;
1069 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1070 au->name, rc);
1071
1072 /* A temporary authentication failure must hold up delivery to
1073 this host. After a permanent authentication failure, we carry on
1074 to try other authentication methods. If all fail hard, try to
1075 deliver the message unauthenticated unless require_auth was set. */
1076
1077 switch(rc)
1078 {
1079 case OK:
1080 smtp_authenticated = TRUE; /* stops the outer loop */
1081 client_authenticator = au->name;
1082 if (au->set_client_id != NULL)
1083 client_authenticated_id = expand_string(au->set_client_id);
1084 break;
1085
1086 /* Failure after writing a command */
1087
1088 case FAIL_SEND:
1089 return FAIL_SEND;
1090
1091 /* Failure after reading a response */
1092
1093 case FAIL:
1094 if (errno != 0 || buffer[0] != '5') return FAIL;
1095 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1096 au->name, host->name, host->address, buffer);
1097 break;
1098
1099 /* Failure by some other means. In effect, the authenticator
1100 decided it wasn't prepared to handle this case. Typically this
1101 is the result of "fail" in an expansion string. Do we need to
1102 log anything here? Feb 2006: a message is now put in the buffer
1103 if logging is required. */
1104
1105 case CANCELLED:
1106 if (*buffer != 0)
1107 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1108 "authentication H=%s [%s] %s", au->name, host->name,
1109 host->address, buffer);
1110 break;
1111
1112 /* Internal problem, message in buffer. */
1113
1114 case ERROR:
1115 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1116 DEFER, FALSE);
1117 return ERROR;
1118 }
1119
1120 break; /* If not authenticated, try next authenticator */
1121 } /* Loop for scanning supported server mechanisms */
1122 } /* Loop for further authenticators */
1123 }
1124 }
1125
1126 /* If we haven't authenticated, but are required to, give up. */
1127
1128 if (require_auth == OK && !smtp_authenticated)
1129 {
1130 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1131 string_sprintf("authentication required but %s", fail_reason), DEFER,
1132 FALSE);
1133 return DEFER;
1134 }
1135
1136 return OK;
1137 }
1138
1139
1140 /* Construct AUTH appendix string for MAIL TO */
1141 /*
1142 Arguments
1143 buffer to build string
1144 addrlist chain of potential addresses to deliver
1145 ob transport options
1146
1147 Globals smtp_authenticated
1148 client_authenticated_sender
1149 Return True on error, otherwise buffer has (possibly empty) terminated string
1150 */
1151
1152 BOOL
1153 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1154 smtp_transport_options_block *ob)
1155 {
1156 uschar *local_authenticated_sender = authenticated_sender;
1157
1158 #ifdef notdef
1159 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1160 #endif
1161
1162 if (ob->authenticated_sender != NULL)
1163 {
1164 uschar *new = expand_string(ob->authenticated_sender);
1165 if (new == NULL)
1166 {
1167 if (!expand_string_forcedfail)
1168 {
1169 uschar *message = string_sprintf("failed to expand "
1170 "authenticated_sender: %s", expand_string_message);
1171 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1172 return TRUE;
1173 }
1174 }
1175 else if (new[0] != 0) local_authenticated_sender = new;
1176 }
1177
1178 /* Add the authenticated sender address if present */
1179
1180 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1181 local_authenticated_sender != NULL)
1182 {
1183 string_format(buffer, bufsize, " AUTH=%s",
1184 auth_xtextencode(local_authenticated_sender,
1185 Ustrlen(local_authenticated_sender)));
1186 client_authenticated_sender = string_copy(local_authenticated_sender);
1187 }
1188 else
1189 *buffer= 0;
1190
1191 return FALSE;
1192 }
1193
1194
1195
1196 #ifdef EXPERIMENTAL_DANE
1197 /* Lookup TLSA record for host/port.
1198 Return: OK success with dnssec; DANE mode
1199 DEFER Do not use this host now, may retry later
1200 FAIL_FORCED No TLSA record; DANE not usable
1201 FAIL Do not use this connection
1202 */
1203
1204 int
1205 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1206 {
1207 /* move this out to host.c given the similarity to dns_lookup() ? */
1208 uschar buffer[300];
1209 const uschar * fullname = buffer;
1210
1211 /* TLSA lookup string */
1212 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1213
1214 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1215 {
1216 case DNS_SUCCEED:
1217 if (!dns_is_secure(dnsa))
1218 {
1219 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1220 return DEFER;
1221 }
1222 return OK;
1223
1224 case DNS_AGAIN:
1225 return DEFER; /* just defer this TLS'd conn */
1226
1227 case DNS_NODATA: /* no TLSA RR for this lookup */
1228 case DNS_NOMATCH: /* no records at all for this lookup */
1229 return dane_required ? FAIL : FAIL_FORCED;
1230
1231 default:
1232 case DNS_FAIL:
1233 return dane_required ? FAIL : DEFER;
1234 }
1235 }
1236 #endif
1237
1238
1239
1240 typedef struct smtp_compare_s
1241 {
1242 uschar *current_sender_address;
1243 struct transport_instance *tblock;
1244 } smtp_compare_t;
1245
1246 /*
1247 Create a unique string that identifies this message, it is based on
1248 sender_address, helo_data and tls_certificate if enabled. */
1249
1250 static uschar *
1251 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1252 {
1253 address_item * addr1;
1254 uschar * if1 = US"";
1255 uschar * helo1 = US"";
1256 #ifdef SUPPORT_TLS
1257 uschar * tlsc1 = US"";
1258 #endif
1259 uschar * save_sender_address = sender_address;
1260 uschar * local_identity = NULL;
1261 smtp_transport_options_block * ob =
1262 (smtp_transport_options_block *)tblock->options_block;
1263
1264 sender_address = sender;
1265
1266 addr1 = deliver_make_addr (sender, TRUE);
1267 deliver_set_expansions(addr1);
1268
1269 if (ob->interface)
1270 if1 = expand_string(ob->interface);
1271
1272 if (ob->helo_data)
1273 helo1 = expand_string(ob->helo_data);
1274
1275 #ifdef SUPPORT_TLS
1276 if (ob->tls_certificate)
1277 tlsc1 = expand_string(ob->tls_certificate);
1278 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1279 #else
1280 local_identity = string_sprintf ("%s^%s", if1, helo1);
1281 #endif
1282
1283 deliver_set_expansions(NULL);
1284 sender_address = save_sender_address;
1285
1286 return local_identity;
1287 }
1288
1289
1290
1291 /* This routine is a callback that is called from transport_check_waiting.
1292 This function will evaluate the incoming message versus the previous
1293 message. If the incoming message is using a different local identity then
1294 we will veto this new message. */
1295
1296 static BOOL
1297 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1298 {
1299 uschar * message_local_identity,
1300 * current_local_identity,
1301 * new_sender_address;
1302
1303 current_local_identity =
1304 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1305
1306 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1307 return 0;
1308
1309 message_local_identity =
1310 smtp_local_identity(new_sender_address, s_compare->tblock);
1311
1312 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1313 }
1314
1315
1316
1317 uschar
1318 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1319 {
1320 #ifdef SUPPORT_TLS
1321 if ( checks & PEER_OFFERED_TLS
1322 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1323 checks &= ~PEER_OFFERED_TLS;
1324 #endif
1325
1326 if ( checks & PEER_OFFERED_IGNQ
1327 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1328 PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_IGNQ;
1330
1331 if ( checks & PEER_OFFERED_CHUNKING
1332 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_CHUNKING;
1334
1335 #ifndef DISABLE_PRDR
1336 if ( checks & PEER_OFFERED_PRDR
1337 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_PRDR;
1339 #endif
1340
1341 #ifdef SUPPORT_I18N
1342 if ( checks & PEER_OFFERED_UTF8
1343 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_UTF8;
1345 #endif
1346
1347 if ( checks & PEER_OFFERED_DSN
1348 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_DSN;
1350
1351 if ( checks & PEER_OFFERED_PIPE
1352 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1353 PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PIPE;
1355
1356 if ( checks & PEER_OFFERED_SIZE
1357 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~PEER_OFFERED_SIZE;
1359
1360 return checks;
1361 }
1362
1363
1364
1365 /* Callback for emitting a BDAT data chunk header.
1366
1367 If given a nonzero size, first flush any buffered SMTP commands
1368 then emit the command.
1369
1370 Reap previous SMTP command responses if requested.
1371 Reap one SMTP command response if requested.
1372
1373 Returns: OK or ERROR
1374 */
1375
1376 static int
1377 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1378 unsigned chunk_size, unsigned flags)
1379 {
1380 smtp_transport_options_block * ob =
1381 (smtp_transport_options_block *)(tctx->tblock->options_block);
1382 int cmd_count = 0;
1383 int prev_cmd_count;
1384 uschar * buffer = tctx->buffer;
1385
1386
1387 /* Write SMTP chunk header command */
1388
1389 if (chunk_size > 0)
1390 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1391 chunk_size,
1392 flags & tc_chunk_last ? " LAST" : "")
1393 ) < 0) return ERROR;
1394
1395 prev_cmd_count = cmd_count += tctx->cmd_count;
1396
1397 /* Reap responses for any previous, but not one we just emitted */
1398
1399 if (chunk_size > 0)
1400 prev_cmd_count--;
1401 if (tctx->pending_BDAT)
1402 prev_cmd_count--;
1403
1404 if (flags & tc_reap_prev && prev_cmd_count > 0)
1405 {
1406 DEBUG(D_transport) debug_printf("look for %d responses"
1407 " for previous pipelined cmds\n", prev_cmd_count);
1408
1409 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1410 tctx->sync_addr, tctx->host, prev_cmd_count,
1411 ob->address_retry_include_sender,
1412 tctx->pending_MAIL, 0,
1413 tctx->inblock,
1414 ob->command_timeout,
1415 buffer, DELIVER_BUFFER_SIZE))
1416 {
1417 case 1: /* 2xx (only) => OK */
1418 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1419 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1420 case 0: break; /* No 2xx or 5xx, but no probs */
1421
1422 case -1: /* Timeout on RCPT */
1423 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1424 }
1425 cmd_count = 1;
1426 if (!tctx->pending_BDAT)
1427 pipelining_active = FALSE;
1428 }
1429
1430 /* Reap response for an outstanding BDAT */
1431
1432 if (tctx->pending_BDAT)
1433 {
1434 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1435
1436 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1437 ob->command_timeout))
1438 {
1439 if (errno == 0 && buffer[0] == '4')
1440 {
1441 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1442 tctx->first_addr->more_errno |=
1443 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1444 }
1445 return ERROR;
1446 }
1447 cmd_count--;
1448 tctx->pending_BDAT = FALSE;
1449 pipelining_active = FALSE;
1450 }
1451 else if (chunk_size > 0)
1452 tctx->pending_BDAT = TRUE;
1453
1454
1455 tctx->cmd_count = cmd_count;
1456 return OK;
1457 }
1458
1459
1460
1461 /*************************************************
1462 * Deliver address list to given host *
1463 *************************************************/
1464
1465 /* If continue_hostname is not null, we get here only when continuing to
1466 deliver down an existing channel. The channel was passed as the standard
1467 input. TLS is never active on a passed channel; the previous process always
1468 closes it down before passing the connection on.
1469
1470 Otherwise, we have to make a connection to the remote host, and do the
1471 initial protocol exchange.
1472
1473 When running as an MUA wrapper, if the sender or any recipient is rejected,
1474 temporarily or permanently, we force failure for all recipients.
1475
1476 Arguments:
1477 addrlist chain of potential addresses to deliver; only those whose
1478 transport_return field is set to PENDING_DEFER are currently
1479 being processed; others should be skipped - they have either
1480 been delivered to an earlier host or IP address, or been
1481 failed by one of them.
1482 host host to deliver to
1483 host_af AF_INET or AF_INET6
1484 port default TCP/IP port to use, in host byte order
1485 interface interface to bind to, or NULL
1486 tblock transport instance block
1487 message_defer set TRUE if yield is OK, but all addresses were deferred
1488 because of a non-recipient, non-host failure, that is, a
1489 4xx response to MAIL FROM, DATA, or ".". This is a defer
1490 that is specific to the message.
1491 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1492 a second attempt after TLS initialization fails
1493
1494 Returns: OK - the connection was made and the delivery attempted;
1495 the result for each address is in its data block.
1496 DEFER - the connection could not be made, or something failed
1497 while setting up the SMTP session, or there was a
1498 non-message-specific error, such as a timeout.
1499 ERROR - a filter command is specified for this transport,
1500 and there was a problem setting it up; OR helo_data
1501 or add_headers or authenticated_sender is specified
1502 for this transport, and the string failed to expand
1503 */
1504
1505 static int
1506 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1507 uschar *interface, transport_instance *tblock,
1508 BOOL *message_defer, BOOL suppress_tls)
1509 {
1510 address_item *addr;
1511 address_item *sync_addr;
1512 address_item *first_addr = addrlist;
1513 int yield = OK;
1514 int address_count;
1515 int save_errno;
1516 int rc;
1517 time_t start_delivery_time = time(NULL);
1518 smtp_transport_options_block *ob =
1519 (smtp_transport_options_block *)(tblock->options_block);
1520 struct lflags {
1521 BOOL lmtp:1;
1522 BOOL smtps:1;
1523 BOOL ok:1;
1524 BOOL send_rset:1;
1525 BOOL send_quit:1;
1526 BOOL setting_up:1;
1527 BOOL esmtp:1;
1528 BOOL pending_MAIL:1;
1529 #ifndef DISABLE_PRDR
1530 BOOL prdr_active:1;
1531 #endif
1532 #ifdef SUPPORT_I18N
1533 BOOL utf8_needed:1;
1534 #endif
1535 BOOL dsn_all_lasthop:1;
1536 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1537 BOOL dane:1;
1538 BOOL dane_required:1;
1539 #endif
1540 } lflags;
1541
1542 BOOL pass_message = FALSE;
1543 BOOL completed_address = FALSE;
1544 uschar peer_offered = 0;
1545 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1546 dns_answer tlsa_dnsa;
1547 #endif
1548 smtp_inblock inblock;
1549 smtp_outblock outblock;
1550 int max_rcpt = tblock->max_addresses;
1551 uschar *igquotstr = US"";
1552
1553 #ifdef EXPERIMENTAL_DSN_INFO
1554 uschar *smtp_greeting = NULL;
1555 uschar *helo_response = NULL;
1556 #endif
1557 uschar *helo_data = NULL;
1558
1559 uschar *message = NULL;
1560 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1561 uschar *p;
1562 uschar buffer[DELIVER_BUFFER_SIZE];
1563 uschar inbuffer[4096];
1564 uschar outbuffer[4096];
1565
1566 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1567
1568 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1569 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1570 lflags.ok = FALSE;
1571 lflags.send_rset = TRUE;
1572 lflags.send_quit = TRUE;
1573 lflags.setting_up = TRUE;
1574 lflags.esmtp = TRUE;
1575 lflags.pending_MAIL;
1576 #ifndef DISABLE_PRDR
1577 lflags.prdr_active;
1578 #endif
1579 #ifdef SUPPORT_I18N
1580 lflags.utf8_needed = FALSE;
1581 #endif
1582 lflags.dsn_all_lasthop = TRUE;
1583 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1584 lflags.dane = FALSE;
1585 lflags.dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1586 #endif
1587
1588 *message_defer = FALSE;
1589 smtp_command = US"initial connection";
1590 if (max_rcpt == 0) max_rcpt = 999999;
1591
1592 /* Set up the buffer for reading SMTP response packets. */
1593
1594 inblock.buffer = inbuffer;
1595 inblock.buffersize = sizeof(inbuffer);
1596 inblock.ptr = inbuffer;
1597 inblock.ptrend = inbuffer;
1598
1599 /* Set up the buffer for holding SMTP commands while pipelining */
1600
1601 outblock.buffer = outbuffer;
1602 outblock.buffersize = sizeof(outbuffer);
1603 outblock.ptr = outbuffer;
1604 outblock.cmd_count = 0;
1605 outblock.authenticating = FALSE;
1606
1607 /* Reset the parameters of a TLS session. */
1608
1609 tls_out.bits = 0;
1610 tls_out.cipher = NULL; /* the one we may use for this transport */
1611 tls_out.ourcert = NULL;
1612 tls_out.peercert = NULL;
1613 tls_out.peerdn = NULL;
1614 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1615 tls_out.sni = NULL;
1616 #endif
1617 tls_out.ocsp = OCSP_NOT_REQ;
1618
1619 /* Flip the legacy TLS-related variables over to the outbound set in case
1620 they're used in the context of the transport. Don't bother resetting
1621 afterward as we're in a subprocess. */
1622
1623 tls_modify_variables(&tls_out);
1624
1625 #ifndef SUPPORT_TLS
1626 if (lflags.smtps)
1627 {
1628 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1629 DEFER, FALSE);
1630 return ERROR;
1631 }
1632 #endif
1633
1634 /* Make a connection to the host if this isn't a continued delivery, and handle
1635 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1636 specially so they can be identified for retries. */
1637
1638 if (continue_hostname == NULL)
1639 {
1640 /* This puts port into host->port */
1641 inblock.sock = outblock.sock =
1642 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1643
1644 if (inblock.sock < 0)
1645 {
1646 set_errno_nohost(addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1647 NULL, DEFER, FALSE);
1648 return DEFER;
1649 }
1650
1651 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1652 {
1653 tls_out.dane_verified = FALSE;
1654 tls_out.tlsa_usage = 0;
1655
1656 if (host->dnssec == DS_YES)
1657 {
1658 if( lflags.dane_required
1659 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1660 )
1661 switch (rc = tlsa_lookup(host, &tlsa_dnsa, lflags.dane_required))
1662 {
1663 case OK: lflags.dane = TRUE; break;
1664 case FAIL_FORCED: break;
1665 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1666 string_sprintf("DANE error: tlsa lookup %s",
1667 rc == DEFER ? "DEFER" : "FAIL"),
1668 rc, FALSE);
1669 return rc;
1670 }
1671 }
1672 else if (lflags.dane_required)
1673 {
1674 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1675 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1676 FAIL, FALSE);
1677 return FAIL;
1678 }
1679
1680 if (lflags.dane)
1681 ob->tls_tempfail_tryclear = FALSE;
1682 }
1683 #endif /*DANE*/
1684
1685 /* Expand the greeting message while waiting for the initial response. (Makes
1686 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1687 delayed till here so that $sending_interface and $sending_port are set. */
1688
1689 helo_data = expand_string(ob->helo_data);
1690 #ifdef SUPPORT_I18N
1691 if (helo_data)
1692 {
1693 uschar * errstr = NULL;
1694 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1695 {
1696 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1697 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1698 yield = DEFER;
1699 goto SEND_QUIT;
1700 }
1701 }
1702 #endif
1703
1704 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1705 is nevertheless a reasonably clean way of programming this kind of logic,
1706 where you want to escape on any error. */
1707
1708 if (!lflags.smtps)
1709 {
1710 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1711 '2', ob->command_timeout);
1712 #ifdef EXPERIMENTAL_DSN_INFO
1713 smtp_greeting = string_copy(buffer);
1714 #endif
1715 if (!good_response) goto RESPONSE_FAILED;
1716
1717 #ifndef DISABLE_EVENT
1718 {
1719 uschar * s;
1720 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1721 : host->dnssec==DS_NO ? US"no" : NULL;
1722 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1723 if (s)
1724 {
1725 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1726 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1727 DEFER, FALSE);
1728 yield = DEFER;
1729 goto SEND_QUIT;
1730 }
1731 }
1732 #endif
1733
1734 /* Now check if the helo_data expansion went well, and sign off cleanly if
1735 it didn't. */
1736
1737 if (helo_data == NULL)
1738 {
1739 uschar *message = string_sprintf("failed to expand helo_data: %s",
1740 expand_string_message);
1741 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1742 yield = DEFER;
1743 goto SEND_QUIT;
1744 }
1745 }
1746
1747 /** Debugging without sending a message
1748 addrlist->transport_return = DEFER;
1749 goto SEND_QUIT;
1750 **/
1751
1752 /* Errors that occur after this point follow an SMTP command, which is
1753 left in big_buffer by smtp_write_command() for use in error messages. */
1754
1755 smtp_command = big_buffer;
1756
1757 /* Tell the remote who we are...
1758
1759 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1760 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1761 greeting is of this form. The assumption was that the far end supports it
1762 properly... but experience shows that there are some that give 5xx responses,
1763 even though the banner includes "ESMTP" (there's a bloody-minded one that
1764 says "ESMTP not spoken here"). Cope with that case.
1765
1766 September 2000: Time has passed, and it seems reasonable now to always send
1767 EHLO at the start. It is also convenient to make the change while installing
1768 the TLS stuff.
1769
1770 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1771 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1772 would be no way to send out the mails, so there is now a host list
1773 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1774 PIPELINING problem as well. Maybe it can also be useful to cure other
1775 problems with broken servers.
1776
1777 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1778 Then somebody tried it with a Microsoft mailer... It seems that all other
1779 mailers use upper case for some reason (the RFC is quite clear about case
1780 independence) so, for peace of mind, I gave in. */
1781
1782 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1783
1784 /* Alas; be careful, since this goto is not an error-out, so conceivably
1785 we might set data between here and the target which we assume to exist
1786 and be usable. I can see this coming back to bite us. */
1787 #ifdef SUPPORT_TLS
1788 if (lflags.smtps)
1789 {
1790 smtp_peer_options |= PEER_OFFERED_TLS;
1791 suppress_tls = FALSE;
1792 ob->tls_tempfail_tryclear = FALSE;
1793 smtp_command = US"SSL-on-connect";
1794 goto TLS_NEGOTIATE;
1795 }
1796 #endif
1797
1798 if (lflags.esmtp)
1799 {
1800 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1801 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1802 goto SEND_FAILED;
1803 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1804 ob->command_timeout))
1805 {
1806 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1807 {
1808 #ifdef EXPERIMENTAL_DSN_INFO
1809 helo_response = string_copy(buffer);
1810 #endif
1811 goto RESPONSE_FAILED;
1812 }
1813 lflags.esmtp = FALSE;
1814 }
1815 #ifdef EXPERIMENTAL_DSN_INFO
1816 helo_response = string_copy(buffer);
1817 #endif
1818 }
1819 else
1820 DEBUG(D_transport)
1821 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1822
1823 if (!lflags.esmtp)
1824 {
1825 BOOL good_response;
1826
1827 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1828 goto SEND_FAILED;
1829 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1830 '2', ob->command_timeout);
1831 #ifdef EXPERIMENTAL_DSN_INFO
1832 helo_response = string_copy(buffer);
1833 #endif
1834 if (!good_response) goto RESPONSE_FAILED;
1835 }
1836
1837 peer_offered = smtp_peer_options = 0;
1838
1839 if (lflags.esmtp || lflags.lmtp)
1840 {
1841 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1842 PEER_OFFERED_TLS /* others checked later */
1843 );
1844
1845 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1846
1847 #ifdef SUPPORT_TLS
1848 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1849 #endif
1850 }
1851 }
1852
1853 /* For continuing deliveries down the same channel, the socket is the standard
1854 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1855 below). Set up the pointer to where subsequent commands will be left, for
1856 error messages. Note that smtp_peer_options will have been
1857 set from the command line if they were set in the process that passed the
1858 connection on. */
1859
1860 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1861 as the contine goes via transport_pass_socket() and doublefork and exec.
1862 It does not wait. Unclear how we keep separate host's responses
1863 separate - we could match up by host ip+port as a bodge. */
1864
1865 else
1866 {
1867 inblock.sock = outblock.sock = fileno(stdin);
1868 smtp_command = big_buffer;
1869 host->port = port; /* Record the port that was used */
1870 }
1871
1872 /* If TLS is available on this connection, whether continued or not, attempt to
1873 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1874 send another EHLO - the server may give a different answer in secure mode. We
1875 use a separate buffer for reading the response to STARTTLS so that if it is
1876 negative, the original EHLO data is available for subsequent analysis, should
1877 the client not be required to use TLS. If the response is bad, copy the buffer
1878 for error analysis. */
1879
1880 #ifdef SUPPORT_TLS
1881 if ( smtp_peer_options & PEER_OFFERED_TLS
1882 && !suppress_tls
1883 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1884 {
1885 uschar buffer2[4096];
1886 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1887 goto SEND_FAILED;
1888
1889 /* If there is an I/O error, transmission of this message is deferred. If
1890 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1891 false, we also defer. However, if there is a temporary rejection of STARTTLS
1892 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1893 STARTTLS, we carry on. This means we will try to send the message in clear,
1894 unless the host is in hosts_require_tls (tested below). */
1895
1896 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1897 ob->command_timeout))
1898 {
1899 if ( errno != 0
1900 || buffer2[0] == 0
1901 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1902 )
1903 {
1904 Ustrncpy(buffer, buffer2, sizeof(buffer));
1905 goto RESPONSE_FAILED;
1906 }
1907 }
1908
1909 /* STARTTLS accepted: try to negotiate a TLS session. */
1910
1911 else
1912 TLS_NEGOTIATE:
1913 {
1914 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1915 # ifdef EXPERIMENTAL_DANE
1916 , lflags.dane ? &tlsa_dnsa : NULL
1917 # endif
1918 );
1919
1920 /* TLS negotiation failed; give an error. From outside, this function may
1921 be called again to try in clear on a new connection, if the options permit
1922 it for this host. */
1923
1924 if (rc != OK)
1925 {
1926 # ifdef EXPERIMENTAL_DANE
1927 if (rc == DEFER && lflags.dane)
1928 {
1929 log_write(0, LOG_MAIN,
1930 "DANE attempt failed; no TLS connection to %s [%s]",
1931 host->name, host->address);
1932 }
1933 # endif
1934
1935 save_errno = ERRNO_TLSFAILURE;
1936 message = US"failure while setting up TLS session";
1937 lflags.send_quit = FALSE;
1938 goto TLS_FAILED;
1939 }
1940
1941 /* TLS session is set up */
1942
1943 smtp_peer_options_wrap = smtp_peer_options;
1944 for (addr = addrlist; addr; addr = addr->next)
1945 if (addr->transport_return == PENDING_DEFER)
1946 {
1947 addr->cipher = tls_out.cipher;
1948 addr->ourcert = tls_out.ourcert;
1949 addr->peercert = tls_out.peercert;
1950 addr->peerdn = tls_out.peerdn;
1951 addr->ocsp = tls_out.ocsp;
1952 }
1953 }
1954 }
1955
1956 /* if smtps, we'll have smtp_command set to something else; always safe to
1957 reset it here. */
1958 smtp_command = big_buffer;
1959
1960 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1961 helo_data is null, we are dealing with a connection that was passed from
1962 another process, and so we won't have expanded helo_data above. We have to
1963 expand it here. $sending_ip_address and $sending_port are set up right at the
1964 start of the Exim process (in exim.c). */
1965
1966 if (tls_out.active >= 0)
1967 {
1968 char *greeting_cmd;
1969 BOOL good_response;
1970
1971 if (helo_data == NULL)
1972 {
1973 helo_data = expand_string(ob->helo_data);
1974 if (helo_data == NULL)
1975 {
1976 uschar *message = string_sprintf("failed to expand helo_data: %s",
1977 expand_string_message);
1978 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1979 yield = DEFER;
1980 goto SEND_QUIT;
1981 }
1982 }
1983
1984 /* For SMTPS we need to wait for the initial OK response. */
1985 if (lflags.smtps)
1986 {
1987 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1988 '2', ob->command_timeout);
1989 #ifdef EXPERIMENTAL_DSN_INFO
1990 smtp_greeting = string_copy(buffer);
1991 #endif
1992 if (!good_response) goto RESPONSE_FAILED;
1993 }
1994
1995 if (lflags.esmtp)
1996 greeting_cmd = "EHLO";
1997 else
1998 {
1999 greeting_cmd = "HELO";
2000 DEBUG(D_transport)
2001 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2002 }
2003
2004 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
2005 lflags.lmtp ? "LHLO" : greeting_cmd, helo_data) < 0)
2006 goto SEND_FAILED;
2007 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2008 '2', ob->command_timeout);
2009 #ifdef EXPERIMENTAL_DSN_INFO
2010 helo_response = string_copy(buffer);
2011 #endif
2012 if (!good_response) goto RESPONSE_FAILED;
2013 smtp_peer_options = 0;
2014 }
2015
2016 /* If the host is required to use a secure channel, ensure that we
2017 have one. */
2018
2019 else if ( lflags.smtps
2020 # ifdef EXPERIMENTAL_DANE
2021 || lflags.dane
2022 # endif
2023 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
2024 )
2025 {
2026 save_errno = ERRNO_TLSREQUIRED;
2027 message = string_sprintf("a TLS session is required, but %s",
2028 smtp_peer_options & PEER_OFFERED_TLS
2029 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2030 goto TLS_FAILED;
2031 }
2032 #endif /*SUPPORT_TLS*/
2033
2034 /* If TLS is active, we have just started it up and re-done the EHLO command,
2035 so its response needs to be analyzed. If TLS is not active and this is a
2036 continued session down a previously-used socket, we haven't just done EHLO, so
2037 we skip this. */
2038
2039 if (continue_hostname == NULL
2040 #ifdef SUPPORT_TLS
2041 || tls_out.active >= 0
2042 #endif
2043 )
2044 {
2045 if (lflags.esmtp || lflags.lmtp)
2046 {
2047 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2048 0 /* no TLS */
2049 | (lflags.lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2050 | PEER_OFFERED_CHUNKING
2051 | PEER_OFFERED_PRDR
2052 #ifdef SUPPORT_I18N
2053 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2054 /*XXX if we hand peercaps on to continued-conn processes,
2055 must not depend on this addr */
2056 #endif
2057 | PEER_OFFERED_DSN
2058 | PEER_OFFERED_PIPE
2059 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2060 );
2061
2062 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2063 lmtp_ignore_quota option was set. */
2064
2065 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2066
2067 /* If the response to EHLO specified support for the SIZE parameter, note
2068 this, provided size_addition is non-negative. */
2069
2070 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2071
2072 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2073 the current host, esmtp will be false, so PIPELINING can never be used. If
2074 the current host matches hosts_avoid_pipelining, don't do it. */
2075
2076 if ( peer_offered & PEER_OFFERED_PIPE
2077 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2078 smtp_peer_options |= PEER_OFFERED_PIPE;
2079
2080 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2081 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2082
2083 if ( peer_offered & PEER_OFFERED_CHUNKING
2084 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2085 peer_offered &= ~PEER_OFFERED_CHUNKING;
2086
2087 if (peer_offered & PEER_OFFERED_CHUNKING)
2088 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2089
2090 #ifndef DISABLE_PRDR
2091 if ( peer_offered & PEER_OFFERED_PRDR
2092 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2093 peer_offered &= ~PEER_OFFERED_PRDR;
2094
2095 if (peer_offered & PEER_OFFERED_PRDR)
2096 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2097 #endif
2098
2099 /* Note if the server supports DSN */
2100 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2101 DEBUG(D_transport) debug_printf("%susing DSN\n",
2102 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2103
2104 /* Note if the response to EHLO specifies support for the AUTH extension.
2105 If it has, check that this host is one we want to authenticate to, and do
2106 the business. The host name and address must be available when the
2107 authenticator's client driver is running. */
2108
2109 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2110 ob, lflags.esmtp, &inblock, &outblock))
2111 {
2112 default: goto SEND_QUIT;
2113 case OK: break;
2114 case FAIL_SEND: goto SEND_FAILED;
2115 case FAIL: goto RESPONSE_FAILED;
2116 }
2117 }
2118 }
2119 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2120
2121 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2122 message-specific. */
2123
2124 lflags.setting_up = FALSE;
2125
2126 #ifdef SUPPORT_I18N
2127 if (addrlist->prop.utf8_msg)
2128 {
2129 lflags.utf8_needed = !addrlist->prop.utf8_downcvt
2130 && !addrlist->prop.utf8_downcvt_maybe;
2131 DEBUG(D_transport) if (!lflags.utf8_needed)
2132 debug_printf("utf8: %s downconvert\n",
2133 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2134 }
2135
2136 /* If this is an international message we need the host to speak SMTPUTF8 */
2137 if (lflags.utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2138 {
2139 errno = ERRNO_UTF8_FWD;
2140 goto RESPONSE_FAILED;
2141 }
2142 #endif
2143
2144 /* If there is a filter command specified for this transport, we can now
2145 set it up. This cannot be done until the identify of the host is known. */
2146
2147 if (tblock->filter_command != NULL)
2148 {
2149 BOOL rc;
2150 uschar buffer[64];
2151 sprintf(CS buffer, "%.50s transport", tblock->name);
2152 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2153 TRUE, DEFER, addrlist, buffer, NULL);
2154 transport_filter_timeout = tblock->filter_timeout;
2155
2156 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2157 yield ERROR. */
2158
2159 if (!rc)
2160 {
2161 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2162 FALSE);
2163 yield = ERROR;
2164 goto SEND_QUIT;
2165 }
2166
2167 if ( transport_filter_argv
2168 && *transport_filter_argv
2169 && **transport_filter_argv
2170 && peer_offered & PEER_OFFERED_CHUNKING
2171 )
2172 {
2173 peer_offered &= ~PEER_OFFERED_CHUNKING;
2174 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2175 }
2176 }
2177
2178
2179 /* For messages that have more than the maximum number of envelope recipients,
2180 we want to send several transactions down the same SMTP connection. (See
2181 comments in deliver.c as to how this reconciles, heuristically, with
2182 remote_max_parallel.) This optimization was added to Exim after the following
2183 code was already working. The simplest way to put it in without disturbing the
2184 code was to use a goto to jump back to this point when there is another
2185 transaction to handle. */
2186
2187 SEND_MESSAGE:
2188 sync_addr = first_addr;
2189 address_count = 0;
2190 lflags.ok = FALSE;
2191 lflags.send_rset = TRUE;
2192 completed_address = FALSE;
2193
2194
2195 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2196 qualification, send it, adding something to the message size to allow for
2197 imprecision and things that get added en route. Exim keeps the number of lines
2198 in a message, so we can give an accurate value for the original message, but we
2199 need some additional to handle added headers. (Double "." characters don't get
2200 included in the count.) */
2201
2202 p = buffer;
2203 *p = 0;
2204
2205 if (peer_offered & PEER_OFFERED_SIZE)
2206 {
2207 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2208 while (*p) p++;
2209 }
2210
2211 #ifndef DISABLE_PRDR
2212 lflags.prdr_active = FALSE;
2213 if (peer_offered & PEER_OFFERED_PRDR)
2214 for (addr = first_addr; addr; addr = addr->next)
2215 if (addr->transport_return == PENDING_DEFER)
2216 {
2217 for (addr = addr->next; addr; addr = addr->next)
2218 if (addr->transport_return == PENDING_DEFER)
2219 { /* at least two recipients to send */
2220 lflags.prdr_active = TRUE;
2221 sprintf(CS p, " PRDR"); p += 5;
2222 break;
2223 }
2224 break;
2225 }
2226 #endif
2227
2228 #ifdef SUPPORT_I18N
2229 if ( addrlist->prop.utf8_msg
2230 && !addrlist->prop.utf8_downcvt
2231 && peer_offered & PEER_OFFERED_UTF8
2232 )
2233 sprintf(CS p, " SMTPUTF8"), p += 9;
2234 #endif
2235
2236 /* check if all addresses have lasthop flag */
2237 /* do not send RET and ENVID if true */
2238 for (lflags.dsn_all_lasthop = TRUE, addr = first_addr;
2239 address_count < max_rcpt && addr != NULL;
2240 addr = addr->next)
2241 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2242 {
2243 lflags.dsn_all_lasthop = FALSE;
2244 break;
2245 }
2246
2247 /* Add any DSN flags to the mail command */
2248
2249 if (peer_offered & PEER_OFFERED_DSN && !lflags.dsn_all_lasthop)
2250 {
2251 if (dsn_ret == dsn_ret_hdrs)
2252 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2253 else if (dsn_ret == dsn_ret_full)
2254 { Ustrcpy(p, " RET=FULL"); p += 9; }
2255
2256 if (dsn_envid)
2257 {
2258 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2259 while (*p) p++;
2260 }
2261 }
2262
2263 /* If an authenticated_sender override has been specified for this transport
2264 instance, expand it. If the expansion is forced to fail, and there was already
2265 an authenticated_sender for this message, the original value will be used.
2266 Other expansion failures are serious. An empty result is ignored, but there is
2267 otherwise no check - this feature is expected to be used with LMTP and other
2268 cases where non-standard addresses (e.g. without domains) might be required. */
2269
2270 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2271 {
2272 yield = ERROR;
2273 goto SEND_QUIT;
2274 }
2275
2276 /* From here until we send the DATA command, we can make use of PIPELINING
2277 if the server host supports it. The code has to be able to check the responses
2278 at any point, for when the buffer fills up, so we write it totally generally.
2279 When PIPELINING is off, each command written reports that it has flushed the
2280 buffer. */
2281
2282 lflags.pending_MAIL = TRUE; /* The block starts with MAIL */
2283
2284 {
2285 uschar * s = return_path;
2286 #ifdef SUPPORT_I18N
2287 uschar * errstr = NULL;
2288
2289 /* If we must downconvert, do the from-address here. Remember we had to
2290 for the to-addresses (done below), and also (ugly) for re-doing when building
2291 the delivery log line. */
2292
2293 if ( addrlist->prop.utf8_msg
2294 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2295 )
2296 {
2297 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2298 {
2299 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2300 yield = ERROR;
2301 goto SEND_QUIT;
2302 }
2303 setflag(addrlist, af_utf8_downcvt);
2304 }
2305 #endif
2306
2307 rc = smtp_write_command(&outblock, pipelining_active,
2308 "MAIL FROM:<%s>%s\r\n", s, buffer);
2309 }
2310
2311 mail_command = string_copy(big_buffer); /* Save for later error message */
2312
2313 switch(rc)
2314 {
2315 case -1: /* Transmission error */
2316 goto SEND_FAILED;
2317
2318 case +1: /* Block was sent */
2319 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2320 ob->command_timeout))
2321 {
2322 if (errno == 0 && buffer[0] == '4')
2323 {
2324 errno = ERRNO_MAIL4XX;
2325 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2326 }
2327 goto RESPONSE_FAILED;
2328 }
2329 lflags.pending_MAIL = FALSE;
2330 break;
2331 }
2332
2333 /* Pass over all the relevant recipient addresses for this host, which are the
2334 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2335 several before we have to read the responses for those seen so far. This
2336 checking is done by a subroutine because it also needs to be done at the end.
2337 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2338 the next one if not all are sent.
2339
2340 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2341 last address because we want to abort if any recipients have any kind of
2342 problem, temporary or permanent. We know that all recipient addresses will have
2343 the PENDING_DEFER status, because only one attempt is ever made, and we know
2344 that max_rcpt will be large, so all addresses will be done at once. */
2345
2346 for (addr = first_addr;
2347 addr && address_count < max_rcpt;
2348 addr = addr->next)
2349 if (addr->transport_return == PENDING_DEFER)
2350 {
2351 int count;
2352 BOOL no_flush;
2353 uschar * rcpt_addr;
2354
2355 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2356 ? dsn_support_yes : dsn_support_no;
2357
2358 address_count++;
2359 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2360
2361 /* Add any DSN flags to the rcpt command and add to the sent string */
2362
2363 p = buffer;
2364 *p = 0;
2365
2366 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2367 {
2368 if (addr->dsn_flags & rf_dsnflags)
2369 {
2370 int i;
2371 BOOL first = TRUE;
2372 Ustrcpy(p, " NOTIFY=");
2373 while (*p) p++;
2374 for (i = 0; i < 4; i++)
2375 if ((addr->dsn_flags & rf_list[i]) != 0)
2376 {
2377 if (!first) *p++ = ',';
2378 first = FALSE;
2379 Ustrcpy(p, rf_names[i]);
2380 while (*p) p++;
2381 }
2382 }
2383
2384 if (addr->dsn_orcpt)
2385 {
2386 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2387 addr->dsn_orcpt);
2388 while (*p) p++;
2389 }
2390 }
2391
2392 /* Now send the RCPT command, and process outstanding responses when
2393 necessary. After a timeout on RCPT, we just end the function, leaving the
2394 yield as OK, because this error can often mean that there is a problem with
2395 just one address, so we don't want to delay the host. */
2396
2397 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2398
2399 #ifdef SUPPORT_I18N
2400 {
2401 uschar * dummy_errstr;
2402 if ( testflag(addrlist, af_utf8_downcvt)
2403 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2404 dummy_errstr
2405 ) )
2406 {
2407 errno = ERRNO_EXPANDFAIL;
2408 goto SEND_FAILED;
2409 }
2410 }
2411 #endif
2412
2413 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2414 rcpt_addr, igquotstr, buffer);
2415
2416 if (count < 0) goto SEND_FAILED;
2417 if (count > 0)
2418 {
2419 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2420 &sync_addr, host, count, ob->address_retry_include_sender,
2421 lflags.pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2422 sizeof(buffer)))
2423 {
2424 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2425 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2426 break;
2427
2428 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2429 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2430 case 0: /* No 2xx or 5xx, but no probs */
2431 break;
2432
2433 case -1: goto END_OFF; /* Timeout on RCPT */
2434 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2435 }
2436 lflags.pending_MAIL = FALSE; /* Dealt with MAIL */
2437 }
2438 } /* Loop for next address */
2439
2440 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2441 permanently or temporarily. We should have flushed and synced after the last
2442 RCPT. */
2443
2444 if (mua_wrapper)
2445 {
2446 address_item *badaddr;
2447 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2448 if (badaddr->transport_return != PENDING_OK)
2449 {
2450 /*XXX could we find a better errno than 0 here? */
2451 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2452 testflag(badaddr, af_pass_message));
2453 lflags.ok = FALSE;
2454 break;
2455 }
2456 }
2457
2458 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2459 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2460 have a good recipient buffered up if we are pipelining. We don't want to waste
2461 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2462 are pipelining. The responses are all handled by sync_responses().
2463 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2464 to send is. */
2465
2466 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2467 && (lflags.ok || (pipelining_active && !mua_wrapper)))
2468 {
2469 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2470
2471 if (count < 0) goto SEND_FAILED;
2472 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2473 host, count, ob->address_retry_include_sender, lflags.pending_MAIL,
2474 lflags.ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2475 {
2476 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2477 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2478 break;
2479
2480 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2481 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2482 case 0: break; /* No 2xx or 5xx, but no probs */
2483
2484 case -1: goto END_OFF; /* Timeout on RCPT */
2485 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2486 }
2487 pipelining_active = FALSE;
2488 }
2489
2490 /* If there were no good recipients (but otherwise there have been no
2491 problems), just set ok TRUE, since we have handled address-specific errors
2492 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2493 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2494 well as body. Set the appropriate timeout value to be used for each chunk.
2495 (Haven't been able to make it work using select() for writing yet.) */
2496
2497 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !lflags.ok)
2498 {
2499 /* Save the first address of the next batch. */
2500 first_addr = addr;
2501
2502 lflags.ok = TRUE;
2503 }
2504 else
2505 {
2506 transport_ctx tctx = {
2507 tblock,
2508 addrlist,
2509 US".", US"..", /* Escaping strings */
2510 topt_use_crlf | topt_escape_headers
2511 | (tblock->body_only ? topt_no_headers : 0)
2512 | (tblock->headers_only ? topt_no_body : 0)
2513 | (tblock->return_path_add ? topt_add_return_path : 0)
2514 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2515 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2516 };
2517
2518 /* If using CHUNKING we need a callback from the generic transport
2519 support to us, for the sending of BDAT smtp commands and the reaping
2520 of responses. The callback needs a whole bunch of state so set up
2521 a transport-context structure to be passed around. */
2522
2523 if (peer_offered & PEER_OFFERED_CHUNKING)
2524 {
2525 tctx.check_string = tctx.escape_string = NULL;
2526 tctx.options |= topt_use_bdat;
2527 tctx.chunk_cb = smtp_chunk_cmd_callback;
2528 tctx.inblock = &inblock;
2529 tctx.outblock = &outblock;
2530 tctx.host = host;
2531 tctx.first_addr = first_addr;
2532 tctx.sync_addr = &sync_addr;
2533 tctx.pending_MAIL = lflags.pending_MAIL;
2534 tctx.pending_BDAT = FALSE;
2535 tctx.good_RCPT = lflags.ok;
2536 tctx.completed_address = &completed_address;
2537 tctx.cmd_count = 0;
2538 tctx.buffer = buffer;
2539 }
2540 else
2541 tctx.options |= topt_end_dot;
2542
2543 /* Save the first address of the next batch. */
2544 first_addr = addr;
2545
2546 /* Responses from CHUNKING commands go in buffer. Otherwise,
2547 there has not been a response. */
2548
2549 buffer[0] = 0;
2550
2551 sigalrm_seen = FALSE;
2552 transport_write_timeout = ob->data_timeout;
2553 smtp_command = US"sending data block"; /* For error messages */
2554 DEBUG(D_transport|D_v)
2555 if (peer_offered & PEER_OFFERED_CHUNKING)
2556 debug_printf(" will write message using CHUNKING\n");
2557 else
2558 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2559 transport_count = 0;
2560
2561 #ifndef DISABLE_DKIM
2562 lflags.ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2563 #else
2564 lflags.ok = transport_write_message(inblock.sock, &tctx, 0);
2565 #endif
2566
2567 /* transport_write_message() uses write() because it is called from other
2568 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2569 it can exit with "Broken pipe" as its error. This really means that the
2570 socket got closed at the far end. */
2571
2572 transport_write_timeout = 0; /* for subsequent transports */
2573
2574 /* Failure can either be some kind of I/O disaster (including timeout),
2575 or the failure of a transport filter or the expansion of added headers.
2576 Or, when CHUNKING, it can be a protocol-detected failure. */
2577
2578 if (!lflags.ok)
2579 goto RESPONSE_FAILED;
2580
2581 /* We used to send the terminating "." explicitly here, but because of
2582 buffering effects at both ends of TCP/IP connections, you don't gain
2583 anything by keeping it separate, so it might as well go in the final
2584 data buffer for efficiency. This is now done by setting the topt_end_dot
2585 flag above. */
2586
2587 smtp_command = US"end of data";
2588
2589 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2590 {
2591 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2592 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2593 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2594 lflags.pending_MAIL, 0,
2595 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2596 {
2597 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2598 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2599 break;
2600
2601 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2602 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2603 case 0: break; /* No 2xx or 5xx, but no probs */
2604
2605 case -1: goto END_OFF; /* Timeout on RCPT */
2606 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2607 }
2608 }
2609
2610 #ifndef DISABLE_PRDR
2611 /* For PRDR we optionally get a partial-responses warning
2612 * followed by the individual responses, before going on with
2613 * the overall response. If we don't get the warning then deal
2614 * with per non-PRDR. */
2615 if(lflags.prdr_active)
2616 {
2617 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2618 ob->final_timeout);
2619 if (!lflags.ok && errno == 0) switch(buffer[0])
2620 {
2621 case '2': lflags.prdr_active = FALSE;
2622 lflags.ok = TRUE;
2623 break;
2624 case '4': errno = ERRNO_DATA4XX;
2625 addrlist->more_errno |=
2626 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2627 break;
2628 }
2629 }
2630 else
2631 #endif
2632
2633 /* For non-PRDR SMTP, we now read a single response that applies to the
2634 whole message. If it is OK, then all the addresses have been delivered. */
2635
2636 if (!lflags.lmtp)
2637 {
2638 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2639 ob->final_timeout);
2640 if (!lflags.ok && errno == 0 && buffer[0] == '4')
2641 {
2642 errno = ERRNO_DATA4XX;
2643 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2644 }
2645 }
2646
2647 /* For LMTP, we get back a response for every RCPT command that we sent;
2648 some may be accepted and some rejected. For those that get a response, their
2649 status is fixed; any that are accepted have been handed over, even if later
2650 responses crash - at least, that's how I read RFC 2033.
2651
2652 If all went well, mark the recipient addresses as completed, record which
2653 host/IPaddress they were delivered to, and cut out RSET when sending another
2654 message down the same channel. Write the completed addresses to the journal
2655 now so that they are recorded in case there is a crash of hardware or
2656 software before the spool gets updated. Also record the final SMTP
2657 confirmation if needed (for SMTP only). */
2658
2659 if (lflags.ok)
2660 {
2661 int flag = '=';
2662 int delivery_time = (int)(time(NULL) - start_delivery_time);
2663 int len;
2664 uschar *conf = NULL;
2665
2666 lflags.send_rset = FALSE;
2667 pipelining_active = FALSE;
2668
2669 /* Set up confirmation if needed - applies only to SMTP */
2670
2671 if (
2672 #ifdef DISABLE_EVENT
2673 LOGGING(smtp_confirmation) &&
2674 #endif
2675 !lflags.lmtp
2676 )
2677 {
2678 const uschar *s = string_printing(buffer);
2679 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2680 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2681 }
2682
2683 /* Process all transported addresses - for LMTP or PRDR, read a status for
2684 each one. */
2685
2686 for (addr = addrlist; addr != first_addr; addr = addr->next)
2687 {
2688 if (addr->transport_return != PENDING_OK) continue;
2689
2690 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2691 remaining addresses. Otherwise, it's a return code for just the one
2692 address. For temporary errors, add a retry item for the address so that
2693 it doesn't get tried again too soon. */
2694
2695 #ifndef DISABLE_PRDR
2696 if (lflags.lmtp || lflags.prdr_active)
2697 #else
2698 if (lflags.lmtp)
2699 #endif
2700 {
2701 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2702 ob->final_timeout))
2703 {
2704 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2705 addr->message = string_sprintf(
2706 #ifndef DISABLE_PRDR
2707 "%s error after %s: %s", lflags.prdr_active ? "PRDR":"LMTP",
2708 #else
2709 "LMTP error after %s: %s",
2710 #endif
2711 big_buffer, string_printing(buffer));
2712 setflag(addr, af_pass_message); /* Allow message to go to user */
2713 if (buffer[0] == '5')
2714 addr->transport_return = FAIL;
2715 else
2716 {
2717 errno = ERRNO_DATA4XX;
2718 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2719 addr->transport_return = DEFER;
2720 #ifndef DISABLE_PRDR
2721 if (!lflags.prdr_active)
2722 #endif
2723 retry_add_item(addr, addr->address_retry_key, 0);
2724 }
2725 continue;
2726 }
2727 completed_address = TRUE; /* NOW we can set this flag */
2728 if (LOGGING(smtp_confirmation))
2729 {
2730 const uschar *s = string_printing(buffer);
2731 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2732 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2733 }
2734 }
2735
2736 /* SMTP, or success return from LMTP for this address. Pass back the
2737 actual host that was used. */
2738
2739 addr->transport_return = OK;
2740 addr->more_errno = delivery_time;
2741 addr->host_used = host;
2742 addr->special_action = flag;
2743 addr->message = conf;
2744 #ifndef DISABLE_PRDR
2745 if (lflags.prdr_active) addr->flags |= af_prdr_used;
2746 #endif
2747 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2748 flag = '-';
2749
2750 #ifndef DISABLE_PRDR
2751 if (!lflags.prdr_active)
2752 #endif
2753 {
2754 /* Update the journal. For homonymic addresses, use the base address plus
2755 the transport name. See lots of comments in deliver.c about the reasons
2756 for the complications when homonyms are involved. Just carry on after
2757 write error, as it may prove possible to update the spool file later. */
2758
2759 if (testflag(addr, af_homonym))
2760 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2761 else
2762 sprintf(CS buffer, "%.500s\n", addr->unique);
2763
2764 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2765 len = Ustrlen(CS buffer);
2766 if (write(journal_fd, buffer, len) != len)
2767 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2768 "%s: %s", buffer, strerror(errno));
2769 }
2770 }
2771
2772 #ifndef DISABLE_PRDR
2773 if (lflags.prdr_active)
2774 {
2775 /* PRDR - get the final, overall response. For any non-success
2776 upgrade all the address statuses. */
2777 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2778 ob->final_timeout);
2779 if (!lflags.ok)
2780 {
2781 if(errno == 0 && buffer[0] == '4')
2782 {
2783 errno = ERRNO_DATA4XX;
2784 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2785 }
2786 for (addr = addrlist; addr != first_addr; addr = addr->next)
2787 if (buffer[0] == '5' || addr->transport_return == OK)
2788 addr->transport_return = PENDING_OK; /* allow set_errno action */
2789 goto RESPONSE_FAILED;
2790 }
2791
2792 /* Update the journal, or setup retry. */
2793 for (addr = addrlist; addr != first_addr; addr = addr->next)
2794 if (addr->transport_return == OK)
2795 {
2796 if (testflag(addr, af_homonym))
2797 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2798 else
2799 sprintf(CS buffer, "%.500s\n", addr->unique);
2800
2801 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2802 len = Ustrlen(CS buffer);
2803 if (write(journal_fd, buffer, len) != len)
2804 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2805 "%s: %s", buffer, strerror(errno));
2806 }
2807 else if (addr->transport_return == DEFER)
2808 retry_add_item(addr, addr->address_retry_key, -2);
2809 }
2810 #endif
2811
2812 /* Ensure the journal file is pushed out to disk. */
2813
2814 if (EXIMfsync(journal_fd) < 0)
2815 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2816 strerror(errno));
2817 }
2818 }
2819
2820
2821 /* Handle general (not specific to one address) failures here. The value of ok
2822 is used to skip over this code on the falling through case. A timeout causes a
2823 deferral. Other errors may defer or fail according to the response code, and
2824 may set up a special errno value, e.g. after connection chopped, which is
2825 assumed if errno == 0 and there is no text in the buffer. If control reaches
2826 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2827 the problem is not related to this specific message. */
2828
2829 if (!lflags.ok)
2830 {
2831 int code, set_rc;
2832 uschar * set_message;
2833
2834 RESPONSE_FAILED:
2835 {
2836 save_errno = errno;
2837 message = NULL;
2838 lflags.send_quit = check_response(host, &save_errno, addrlist->more_errno,
2839 buffer, &code, &message, &pass_message);
2840 goto FAILED;
2841 }
2842
2843 SEND_FAILED:
2844 {
2845 save_errno = errno;
2846 code = '4';
2847 message = US string_sprintf("send() to %s [%s] failed: %s",
2848 host->name, host->address, strerror(save_errno));
2849 lflags.send_quit = FALSE;
2850 goto FAILED;
2851 }
2852
2853 /* This label is jumped to directly when a TLS negotiation has failed,
2854 or was not done for a host for which it is required. Values will be set
2855 in message and save_errno, and setting_up will always be true. Treat as
2856 a temporary error. */
2857
2858 #ifdef SUPPORT_TLS
2859 TLS_FAILED:
2860 code = '4';
2861 #endif
2862
2863 /* If the failure happened while setting up the call, see if the failure was
2864 a 5xx response (this will either be on connection, or following HELO - a 5xx
2865 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2866 never going to accept them. For other errors during setting up (timeouts or
2867 whatever), defer all addresses, and yield DEFER, so that the host is not
2868 tried again for a while. */
2869
2870 FAILED:
2871 lflags.ok = FALSE; /* For when reached by GOTO */
2872 set_message = message;
2873
2874 if (lflags.setting_up)
2875 if (code == '5')
2876 set_rc = FAIL;
2877 else
2878 yield = set_rc = DEFER;
2879
2880 /* We want to handle timeouts after MAIL or "." and loss of connection after
2881 "." specially. They can indicate a problem with the sender address or with
2882 the contents of the message rather than a real error on the connection. These
2883 cases are treated in the same way as a 4xx response. This next bit of code
2884 does the classification. */
2885
2886 else
2887 {
2888 BOOL message_error;
2889
2890 switch(save_errno)
2891 {
2892 #ifdef SUPPORT_I18N
2893 case ERRNO_UTF8_FWD:
2894 code = '5';
2895 /*FALLTHROUGH*/
2896 #endif
2897 case 0:
2898 case ERRNO_MAIL4XX:
2899 case ERRNO_DATA4XX:
2900 message_error = TRUE;
2901 break;
2902
2903 case ETIMEDOUT:
2904 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2905 Ustrncmp(smtp_command,"end ",4) == 0;
2906 break;
2907
2908 case ERRNO_SMTPCLOSED:
2909 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2910 break;
2911
2912 default:
2913 message_error = FALSE;
2914 break;
2915 }
2916
2917 /* Handle the cases that are treated as message errors. These are:
2918
2919 (a) negative response or timeout after MAIL
2920 (b) negative response after DATA
2921 (c) negative response or timeout or dropped connection after "."
2922 (d) utf8 support required and not offered
2923
2924 It won't be a negative response or timeout after RCPT, as that is dealt
2925 with separately above. The action in all cases is to set an appropriate
2926 error code for all the addresses, but to leave yield set to OK because the
2927 host itself has not failed. Of course, it might in practice have failed
2928 when we've had a timeout, but if so, we'll discover that at the next
2929 delivery attempt. For a temporary error, set the message_defer flag, and
2930 write to the logs for information if this is not the last host. The error
2931 for the last host will be logged as part of the address's log line. */
2932
2933 if (message_error)
2934 {
2935 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2936
2937 /* If there's an errno, the message contains just the identity of
2938 the host. */
2939
2940 if (code == '5')
2941 set_rc = FAIL;
2942 else /* Anything other than 5 is treated as temporary */
2943 {
2944 set_rc = DEFER;
2945 if (save_errno > 0)
2946 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2947 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2948 msglog_line(host, message);
2949 *message_defer = TRUE;
2950 }
2951 }
2952
2953 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2954 ".", or some other transportation error. We defer all addresses and yield
2955 DEFER, except for the case of failed add_headers expansion, or a transport
2956 filter failure, when the yield should be ERROR, to stop it trying other
2957 hosts. */
2958
2959 else
2960 {
2961 set_rc = DEFER;
2962 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2963 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2964 }
2965 }
2966
2967 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2968 #ifdef EXPERIMENTAL_DSN_INFO
2969 , smtp_greeting, helo_response
2970 #endif
2971 );
2972 }
2973
2974
2975 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2976 SMTP session tidily. However, if there were too many addresses to send in one
2977 message (indicated by first_addr being non-NULL) we want to carry on with the
2978 rest of them. Also, it is desirable to send more than one message down the SMTP
2979 connection if there are several waiting, provided we haven't already sent so
2980 many as to hit the configured limit. The function transport_check_waiting looks
2981 for a waiting message and returns its id. Then transport_pass_socket tries to
2982 set up a continued delivery by passing the socket on to another process. The
2983 variable send_rset is FALSE if a message has just been successfully transfered.
2984
2985 If we are already sending down a continued channel, there may be further
2986 addresses not yet delivered that are aimed at the same host, but which have not
2987 been passed in this run of the transport. In this case, continue_more will be
2988 true, and all we should do is send RSET if necessary, and return, leaving the
2989 channel open.
2990
2991 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2992 do not want to continue with other messages down the same channel, because that
2993 can lead to looping between two or more messages, all with the same,
2994 temporarily failing address(es). [The retry information isn't updated yet, so
2995 new processes keep on trying.] We probably also don't want to try more of this
2996 message's addresses either.
2997
2998 If we have started a TLS session, we have to end it before passing the
2999 connection to a new process. However, not all servers can handle this (Exim
3000 can), so we do not pass such a connection on if the host matches
3001 hosts_nopass_tls. */
3002
3003 DEBUG(D_transport)
3004 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3005 "yield=%d first_address is %sNULL\n", lflags.ok, lflags.send_quit,
3006 lflags.send_rset, continue_more, yield, first_addr ? "not " : "");
3007
3008 if (completed_address && lflags.ok && lflags.send_quit)
3009 {
3010 BOOL more;
3011 smtp_compare_t t_compare;
3012
3013 t_compare.tblock = tblock;
3014 t_compare.current_sender_address = sender_address;
3015
3016 if ( first_addr != NULL
3017 || continue_more
3018 || ( ( tls_out.active < 0
3019 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
3020 )
3021 &&
3022 transport_check_waiting(tblock->name, host->name,
3023 tblock->connection_max_messages, new_message_id, &more,
3024 (oicf)smtp_are_same_identities, (void*)&t_compare)
3025 ) )
3026 {
3027 uschar *msg;
3028 BOOL pass_message;
3029
3030 if (lflags.send_rset)
3031 {
3032 if (! (lflags.ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3033 {
3034 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3035 host->address, strerror(save_errno));
3036 lflags.send_quit = FALSE;
3037 }
3038 else if (! (lflags.ok = smtp_read_response(&inblock, buffer,
3039 sizeof(buffer), '2', ob->command_timeout)))
3040 {
3041 int code;
3042 lflags.send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3043 &pass_message);
3044 if (!lflags.send_quit)
3045 {
3046 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3047 host->name, host->address, msg);
3048 }
3049 }
3050 }
3051
3052 /* Either RSET was not needed, or it succeeded */
3053
3054 if (lflags.ok)
3055 {
3056 if (first_addr != NULL) /* More addresses still to be sent */
3057 { /* in this run of the transport */
3058 continue_sequence++; /* Causes * in logging */
3059 goto SEND_MESSAGE;
3060 }
3061 if (continue_more) return yield; /* More addresses for another run */
3062
3063 /* Pass the socket to a new Exim process. Before doing so, we must shut
3064 down TLS. Not all MTAs allow for the continuation of the SMTP session
3065 when TLS is shut down. We test for this by sending a new EHLO. If we
3066 don't get a good response, we don't attempt to pass the socket on. */
3067
3068 #ifdef SUPPORT_TLS
3069 if (tls_out.active >= 0)
3070 {
3071 tls_close(FALSE, TRUE);
3072 smtp_peer_options = smtp_peer_options_wrap;
3073 if (lflags.smtps)
3074 lflags.ok = FALSE;
3075 else
3076 lflags.ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3077 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3078 ob->command_timeout);
3079 }
3080 #endif
3081
3082 /* If the socket is successfully passed, we musn't send QUIT (or
3083 indeed anything!) from here. */
3084
3085 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3086 propagate it from the initial
3087 */
3088 if (lflags.ok && transport_pass_socket(tblock->name, host->name,
3089 host->address, new_message_id, inblock.sock))
3090 lflags.send_quit = FALSE;
3091 }
3092
3093 /* If RSET failed and there are addresses left, they get deferred. */
3094
3095 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3096 #ifdef EXPERIMENTAL_DSN_INFO
3097 , smtp_greeting, helo_response
3098 #endif
3099 );
3100 }
3101 }
3102
3103 /* End off tidily with QUIT unless the connection has died or the socket has
3104 been passed to another process. There has been discussion on the net about what
3105 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3106 to wait for a response, but on the other hand, there isn't anything one can do
3107 with an error response, other than log it. Exim used to do that. However,
3108 further discussion suggested that it is positively advantageous not to wait for
3109 the response, but to close the session immediately. This is supposed to move
3110 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3111 load from the server. (Hosts that are both servers and clients may not see much
3112 difference, of course.) Further discussion indicated that this was safe to do
3113 on Unix systems which have decent implementations of TCP/IP that leave the
3114 connection around for a while (TIME_WAIT) after the application has gone away.
3115 This enables the response sent by the server to be properly ACKed rather than
3116 timed out, as can happen on broken TCP/IP implementations on other OS.
3117
3118 This change is being made on 31-Jul-98. After over a year of trouble-free
3119 operation, the old commented-out code was removed on 17-Sep-99. */
3120
3121 SEND_QUIT:
3122 if (lflags.send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3123
3124 END_OFF:
3125
3126 #ifdef SUPPORT_TLS
3127 tls_close(FALSE, TRUE);
3128 #endif
3129
3130 /* Close the socket, and return the appropriate value, first setting
3131 works because the NULL setting is passed back to the calling process, and
3132 remote_max_parallel is forced to 1 when delivering over an existing connection,
3133
3134 If all went well and continue_more is set, we shouldn't actually get here if
3135 there are further addresses, as the return above will be taken. However,
3136 writing RSET might have failed, or there may be other addresses whose hosts are
3137 specified in the transports, and therefore not visible at top level, in which
3138 case continue_more won't get set. */
3139
3140 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3141 (void)close(inblock.sock);
3142
3143 #ifndef DISABLE_EVENT
3144 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3145 #endif
3146
3147 continue_transport = NULL;
3148 continue_hostname = NULL;
3149 return yield;
3150 }
3151
3152
3153
3154
3155 /*************************************************
3156 * Closedown entry point *
3157 *************************************************/
3158
3159 /* This function is called when exim is passed an open smtp channel
3160 from another incarnation, but the message which it has been asked
3161 to deliver no longer exists. The channel is on stdin.
3162
3163 We might do fancy things like looking for another message to send down
3164 the channel, but if the one we sought has gone, it has probably been
3165 delivered by some other process that itself will seek further messages,
3166 so just close down our connection.
3167
3168 Argument: pointer to the transport instance block
3169 Returns: nothing
3170 */
3171
3172 void
3173 smtp_transport_closedown(transport_instance *tblock)
3174 {
3175 smtp_transport_options_block *ob =
3176 (smtp_transport_options_block *)(tblock->options_block);
3177 smtp_inblock inblock;
3178 smtp_outblock outblock;
3179 uschar buffer[256];
3180 uschar inbuffer[4096];
3181 uschar outbuffer[16];
3182
3183 inblock.sock = fileno(stdin);
3184 inblock.buffer = inbuffer;
3185 inblock.buffersize = sizeof(inbuffer);
3186 inblock.ptr = inbuffer;
3187 inblock.ptrend = inbuffer;
3188
3189 outblock.sock = inblock.sock;
3190 outblock.buffersize = sizeof(outbuffer);
3191 outblock.buffer = outbuffer;
3192 outblock.ptr = outbuffer;
3193 outblock.cmd_count = 0;
3194 outblock.authenticating = FALSE;
3195
3196 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3197 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3198 ob->command_timeout);
3199 (void)close(inblock.sock);
3200 }
3201
3202
3203
3204 /*************************************************
3205 * Prepare addresses for delivery *
3206 *************************************************/
3207
3208 /* This function is called to flush out error settings from previous delivery
3209 attempts to other hosts. It also records whether we got here via an MX record
3210 or not in the more_errno field of the address. We are interested only in
3211 addresses that are still marked DEFER - others may have got delivered to a
3212 previously considered IP address. Set their status to PENDING_DEFER to indicate
3213 which ones are relevant this time.
3214
3215 Arguments:
3216 addrlist the list of addresses
3217 host the host we are delivering to
3218
3219 Returns: the first address for this delivery
3220 */
3221
3222 static address_item *
3223 prepare_addresses(address_item *addrlist, host_item *host)
3224 {
3225 address_item *first_addr = NULL;
3226 address_item *addr;
3227 for (addr = addrlist; addr; addr = addr->next)
3228 if (addr->transport_return == DEFER)
3229 {
3230 if (!first_addr) first_addr = addr;
3231 addr->transport_return = PENDING_DEFER;
3232 addr->basic_errno = 0;
3233 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3234 addr->message = NULL;
3235 #ifdef SUPPORT_TLS
3236 addr->cipher = NULL;
3237 addr->ourcert = NULL;
3238 addr->peercert = NULL;
3239 addr->peerdn = NULL;
3240 addr->ocsp = OCSP_NOT_REQ;
3241 #endif
3242 #ifdef EXPERIMENTAL_DSN_INFO
3243 addr->smtp_greeting = NULL;
3244 addr->helo_response = NULL;
3245 #endif
3246 }
3247 return first_addr;
3248 }
3249
3250
3251
3252 /*************************************************
3253 * Main entry point *
3254 *************************************************/
3255
3256 /* See local README for interface details. As this is a remote transport, it is
3257 given a chain of addresses to be delivered in one connection, if possible. It
3258 always returns TRUE, indicating that each address has its own independent
3259 status set, except if there is a setting up problem, in which case it returns
3260 FALSE. */
3261
3262 BOOL
3263 smtp_transport_entry(
3264 transport_instance *tblock, /* data for this instantiation */
3265 address_item *addrlist) /* addresses we are working on */
3266 {
3267 int cutoff_retry;
3268 int port;
3269 int hosts_defer = 0;
3270 int hosts_fail = 0;
3271 int hosts_looked_up = 0;
3272 int hosts_retry = 0;
3273 int hosts_serial = 0;
3274 int hosts_total = 0;
3275 int total_hosts_tried = 0;
3276 address_item *addr;
3277 BOOL expired = TRUE;
3278 uschar *expanded_hosts = NULL;
3279 uschar *pistring;
3280 uschar *tid = string_sprintf("%s transport", tblock->name);
3281 smtp_transport_options_block *ob =
3282 (smtp_transport_options_block *)(tblock->options_block);
3283 host_item *hostlist = addrlist->host_list;
3284 host_item *host = NULL;
3285
3286 DEBUG(D_transport)
3287 {
3288 debug_printf("%s transport entered\n", tblock->name);
3289 for (addr = addrlist; addr; addr = addr->next)
3290 debug_printf(" %s\n", addr->address);
3291 if (hostlist)
3292 {
3293 debug_printf("hostlist:\n");
3294 for (host = hostlist; host; host = host->next)
3295 debug_printf(" %s:%d\n", host->name, host->port);
3296 }
3297 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3298 continue_hostname, continue_host_address);
3299 }
3300
3301 /* Set the flag requesting that these hosts be added to the waiting
3302 database if the delivery fails temporarily or if we are running with
3303 queue_smtp or a 2-stage queue run. This gets unset for certain
3304 kinds of error, typically those that are specific to the message. */
3305
3306 update_waiting = TRUE;
3307
3308 /* If a host list is not defined for the addresses - they must all have the
3309 same one in order to be passed to a single transport - or if the transport has
3310 a host list with hosts_override set, use the host list supplied with the
3311 transport. It is an error for this not to exist. */
3312
3313 if (!hostlist || (ob->hosts_override && ob->hosts))
3314 {
3315 if (!ob->hosts)
3316 {
3317 addrlist->message = string_sprintf("%s transport called with no hosts set",
3318 tblock->name);
3319 addrlist->transport_return = PANIC;
3320 return FALSE; /* Only top address has status */
3321 }
3322
3323 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3324 ob->hosts);
3325
3326 /* If the transport's host list contains no '$' characters, and we are not
3327 randomizing, it is fixed and therefore a chain of hosts can be built once
3328 and for all, and remembered for subsequent use by other calls to this
3329 transport. If, on the other hand, the host list does contain '$', or we are
3330 randomizing its order, we have to rebuild it each time. In the fixed case,
3331 as the hosts string will never be used again, it doesn't matter that we
3332 replace all the : characters with zeros. */
3333
3334 if (!ob->hostlist)
3335 {
3336 uschar *s = ob->hosts;
3337
3338 if (Ustrchr(s, '$') != NULL)
3339 {
3340 if (!(expanded_hosts = expand_string(s)))
3341 {
3342 addrlist->message = string_sprintf("failed to expand list of hosts "
3343 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3344 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3345 return FALSE; /* Only top address has status */
3346 }
3347 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3348 "\"%s\"\n", s, expanded_hosts);
3349 s = expanded_hosts;
3350 }
3351 else
3352 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3353
3354 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3355
3356 /* Check that the expansion yielded something useful. */
3357 if (!hostlist)
3358 {
3359 addrlist->message =
3360 string_sprintf("%s transport has empty hosts setting", tblock->name);
3361 addrlist->transport_return = PANIC;
3362 return FALSE; /* Only top address has status */
3363 }
3364
3365 /* If there was no expansion of hosts, save the host list for
3366 next time. */
3367
3368 if (!expanded_hosts) ob->hostlist = hostlist;
3369 }
3370
3371 /* This is not the first time this transport has been run in this delivery;
3372 the host list was built previously. */
3373
3374 else
3375 hostlist = ob->hostlist;
3376 }
3377
3378 /* The host list was supplied with the address. If hosts_randomize is set, we
3379 must sort it into a random order if it did not come from MX records and has not
3380 already been randomized (but don't bother if continuing down an existing
3381 connection). */
3382
3383 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3384 {
3385 host_item *newlist = NULL;
3386 while (hostlist)
3387 {
3388 host_item *h = hostlist;
3389 hostlist = hostlist->next;
3390
3391 h->sort_key = random_number(100);
3392
3393 if (!newlist)
3394 {
3395 h->next = NULL;
3396 newlist = h;
3397 }
3398 else if (h->sort_key < newlist->sort_key)
3399 {
3400 h->next = newlist;
3401 newlist = h;
3402 }
3403 else
3404 {
3405 host_item *hh = newlist;
3406 while (hh->next)
3407 {
3408 if (h->sort_key < hh->next->sort_key) break;
3409 hh = hh->next;
3410 }
3411 h->next = hh->next;
3412 hh->next = h;
3413 }
3414 }
3415
3416 hostlist = addrlist->host_list = newlist;
3417 }
3418
3419 /* Sort out the default port. */
3420
3421 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3422
3423 /* For each host-plus-IP-address on the list:
3424
3425 . If this is a continued delivery and the host isn't the one with the
3426 current connection, skip.
3427
3428 . If the status is unusable (i.e. previously failed or retry checked), skip.
3429
3430 . If no IP address set, get the address, either by turning the name into
3431 an address, calling gethostbyname if gethostbyname is on, or by calling
3432 the DNS. The DNS may yield multiple addresses, in which case insert the
3433 extra ones into the list.
3434
3435 . Get the retry data if not previously obtained for this address and set the
3436 field which remembers the state of this address. Skip if the retry time is
3437 not reached. If not, remember whether retry data was found. The retry string
3438 contains both the name and the IP address.
3439
3440 . Scan the list of addresses and mark those whose status is DEFER as
3441 PENDING_DEFER. These are the only ones that will be processed in this cycle
3442 of the hosts loop.
3443
3444 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3445 Some addresses may be successfully delivered, others may fail, and yet
3446 others may get temporary errors and so get marked DEFER.
3447
3448 . The return from the delivery attempt is OK if a connection was made and a
3449 valid SMTP dialogue was completed. Otherwise it is DEFER.
3450
3451 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3452
3453 . If fail to connect, or other defer state, add a retry item.
3454
3455 . If there are any addresses whose status is still DEFER, carry on to the
3456 next host/IPaddress, unless we have tried the number of hosts given
3457 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3458 there is some fancy logic for hosts_max_try that means its limit can be
3459 overstepped in some circumstances.
3460
3461 If we get to the end of the list, all hosts have deferred at least one address,
3462 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3463 delivery attempt to those hosts whose last try was before the arrival time of
3464 the current message. To cope with this, we have to go round the loop a second
3465 time. After that, set the status and error data for any addresses that haven't
3466 had it set already. */
3467
3468 for (cutoff_retry = 0;
3469 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3470 cutoff_retry++)
3471 {
3472 host_item *nexthost = NULL;
3473 int unexpired_hosts_tried = 0;
3474
3475 for (host = hostlist;
3476 host
3477 && unexpired_hosts_tried < ob->hosts_max_try
3478 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3479 host = nexthost)
3480 {
3481 int rc;
3482 int host_af;
3483 uschar *rs;
3484 BOOL host_is_expired = FALSE;
3485 BOOL message_defer = FALSE;
3486 BOOL some_deferred = FALSE;
3487 address_item *first_addr = NULL;
3488 uschar *interface = NULL;
3489 uschar *retry_host_key = NULL;
3490 uschar *retry_message_key = NULL;
3491 uschar *serialize_key = NULL;
3492
3493 /* Default next host is next host. :-) But this can vary if the
3494 hosts_max_try limit is hit (see below). It may also be reset if a host
3495 address is looked up here (in case the host was multihomed). */
3496
3497 nexthost = host->next;
3498
3499 /* If the address hasn't yet been obtained from the host name, look it up
3500 now, unless the host is already marked as unusable. If it is marked as
3501 unusable, it means that the router was unable to find its IP address (in
3502 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3503 the lookup failed last time. We don't get this far if *all* MX records
3504 point to non-existent hosts; that is treated as a hard error.
3505
3506 We can just skip this host entirely. When the hosts came from the router,
3507 the address will timeout based on the other host(s); when the address is
3508 looked up below, there is an explicit retry record added.
3509
3510 Note that we mustn't skip unusable hosts if the address is not unset; they
3511 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3512
3513 if (!host->address)
3514 {
3515 int new_port, flags;
3516 host_item *hh;
3517
3518 if (host->status >= hstatus_unusable)
3519 {
3520 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3521 host->name);
3522 continue;
3523 }
3524
3525 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3526
3527 /* The host name is permitted to have an attached port. Find it, and
3528 strip it from the name. Just remember it for now. */
3529
3530 new_port = host_item_get_port(host);
3531
3532 /* Count hosts looked up */
3533
3534 hosts_looked_up++;
3535
3536 /* Find by name if so configured, or if it's an IP address. We don't
3537 just copy the IP address, because we need the test-for-local to happen. */
3538
3539 flags = HOST_FIND_BY_A;
3540 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3541 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3542
3543 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3544 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3545 else
3546 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3547 &ob->dnssec, /* domains for request/require */
3548 NULL, NULL);
3549
3550 /* Update the host (and any additional blocks, resulting from
3551 multihoming) with a host-specific port, if any. */
3552
3553 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3554
3555 /* Failure to find the host at this time (usually DNS temporary failure)
3556 is really a kind of routing failure rather than a transport failure.
3557 Therefore we add a retry item of the routing kind, not to stop us trying
3558 to look this name up here again, but to ensure the address gets timed
3559 out if the failures go on long enough. A complete failure at this point
3560 commonly points to a configuration error, but the best action is still
3561 to carry on for the next host. */
3562
3563 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3564 {
3565 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3566 expired = FALSE;
3567 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3568 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3569 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3570 host->status = hstatus_unusable;
3571
3572 for (addr = addrlist; addr; addr = addr->next)
3573 {
3574 if (addr->transport_return != DEFER) continue;
3575 addr->basic_errno = ERRNO_UNKNOWNHOST;
3576 addr->message =
3577 string_sprintf("failed to lookup IP address for %s", host->name);
3578 }
3579 continue;
3580 }
3581
3582 /* If the host is actually the local host, we may have a problem, or
3583 there may be some cunning configuration going on. In the problem case,
3584 log things and give up. The default transport status is already DEFER. */
3585
3586 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3587 {
3588 for (addr = addrlist; addr; addr = addr->next)
3589 {
3590 addr->basic_errno = 0;
3591 addr->message = string_sprintf("%s transport found host %s to be "
3592 "local", tblock->name, host->name);
3593 }
3594 goto END_TRANSPORT;
3595 }
3596 } /* End of block for IP address lookup */
3597
3598 /* If this is a continued delivery, we are interested only in the host
3599 which matches the name of the existing open channel. The check is put
3600 here after the local host lookup, in case the name gets expanded as a
3601 result of the lookup. Set expired FALSE, to save the outer loop executing
3602 twice. */
3603
3604 if ( continue_hostname
3605 && ( Ustrcmp(continue_hostname, host->name) != 0
3606 || Ustrcmp(continue_host_address, host->address) != 0
3607 ) )
3608 {
3609 expired = FALSE;
3610 continue; /* With next host */
3611 }
3612
3613 /* Reset the default next host in case a multihomed host whose addresses
3614 are not looked up till just above added to the host list. */
3615
3616 nexthost = host->next;
3617
3618 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3619 domain is in queue_smtp_domains, we don't actually want to attempt any
3620 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3621 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3622 were not in it. We don't want to hold up all SMTP deliveries! Except when
3623 doing a two-stage queue run, don't do this if forcing. */
3624
3625 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3626 match_isinlist(addrlist->domain,
3627 (const uschar **)&queue_smtp_domains, 0,
3628 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3629 {
3630 expired = FALSE;
3631 for (addr = addrlist; addr; addr = addr->next)
3632 if (addr->transport_return == DEFER)
3633 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3634 continue; /* With next host */
3635 }
3636
3637 /* Count hosts being considered - purely for an intelligent comment
3638 if none are usable. */
3639
3640 hosts_total++;
3641
3642 /* Set $host and $host address now in case they are needed for the
3643 interface expansion or the serialize_hosts check; they remain set if an
3644 actual delivery happens. */
3645
3646 deliver_host = host->name;
3647 deliver_host_address = host->address;
3648 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3649 : host->dnssec == DS_NO ? US"no"
3650 : US"";
3651
3652 /* Set up a string for adding to the retry key if the port number is not
3653 the standard SMTP port. A host may have its own port setting that overrides
3654 the default. */
3655
3656 pistring = string_sprintf(":%d", host->port == PORT_NONE
3657 ? port : host->port);
3658 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3659
3660 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3661 string is set, even if constant (as different transports can have different
3662 constant settings), we must add it to the key that is used for retries,
3663 because connections to the same host from a different interface should be
3664 treated separately. */
3665
3666 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3667 if ((rs = ob->interface) && *rs)
3668 {
3669 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3670 return FALSE;
3671 pistring = string_sprintf("%s/%s", pistring, interface);
3672 }
3673
3674 /* The first time round the outer loop, check the status of the host by
3675 inspecting the retry data. The second time round, we are interested only
3676 in expired hosts that haven't been tried since this message arrived. */
3677
3678 if (cutoff_retry == 0)
3679 {
3680 BOOL incl_ip;
3681 /* Ensure the status of the address is set by checking retry data if
3682 necessary. There may be host-specific retry data (applicable to all
3683 messages) and also data for retries of a specific message at this host.
3684 If either of these retry records are actually read, the keys used are
3685 returned to save recomputing them later. */
3686
3687 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3688 US"retry_include_ip_address", ob->retry_include_ip_address,
3689 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3690 continue; /* with next host */
3691
3692 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3693 incl_ip, &retry_host_key, &retry_message_key);
3694
3695 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3696 (host->address == NULL)? US"" : host->address, pistring,
3697 (host->status == hstatus_usable)? "usable" :
3698 (host->status == hstatus_unusable)? "unusable" :
3699 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3700
3701 /* Skip this address if not usable at this time, noting if it wasn't
3702 actually expired, both locally and in the address. */
3703
3704 switch (host->status)
3705 {
3706 case hstatus_unusable:
3707 expired = FALSE;
3708 setflag(addrlist, af_retry_skipped);
3709 /* Fall through */
3710
3711 case hstatus_unusable_expired:
3712 switch (host->why)
3713 {
3714 case hwhy_retry: hosts_retry++; break;
3715 case hwhy_failed: hosts_fail++; break;
3716 case hwhy_deferred: hosts_defer++; break;
3717 }
3718
3719 /* If there was a retry message key, implying that previously there
3720 was a message-specific defer, we don't want to update the list of
3721 messages waiting for these hosts. */
3722
3723 if (retry_message_key) update_waiting = FALSE;
3724 continue; /* With the next host or IP address */
3725 }
3726 }
3727
3728 /* Second time round the loop: if the address is set but expired, and
3729 the message is newer than the last try, let it through. */
3730
3731 else
3732 {
3733 if ( !host->address
3734 || host->status != hstatus_unusable_expired
3735 || host->last_try > received_time)
3736 continue;
3737 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3738 host->name, host->address, pistring);
3739 host_is_expired = TRUE;
3740 }
3741
3742 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3743 it remains TRUE only if all hosts are expired and none are actually tried.
3744 */
3745
3746 expired = FALSE;
3747
3748 /* If this host is listed as one to which access must be serialized,
3749 see if another Exim process has a connection to it, and if so, skip
3750 this host. If not, update the database to record our connection to it
3751 and remember this for later deletion. Do not do any of this if we are
3752 sending the message down a pre-existing connection. */
3753
3754 if ( !continue_hostname
3755 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3756 {
3757 serialize_key = string_sprintf("host-serialize-%s", host->name);
3758 if (!enq_start(serialize_key, 1))
3759 {
3760 DEBUG(D_transport)
3761 debug_printf("skipping host %s because another Exim process "
3762 "is connected to it\n", host->name);
3763 hosts_serial++;
3764 continue;
3765 }
3766 }
3767
3768 /* OK, we have an IP address that is not waiting for its retry time to
3769 arrive (it might be expired) OR (second time round the loop) we have an
3770 expired host that hasn't been tried since the message arrived. Have a go
3771 at delivering the message to it. First prepare the addresses by flushing
3772 out the result of previous attempts, and finding the first address that
3773 is still to be delivered. */
3774
3775 first_addr = prepare_addresses(addrlist, host);
3776
3777 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3778 message_id, host->name, host->address, addrlist->address,
3779 addrlist->next ? ", ..." : "");
3780
3781 set_process_info("delivering %s to %s [%s] (%s%s)",
3782 message_id, host->name, host->address, addrlist->address,
3783 addrlist->next ? ", ..." : "");
3784
3785 /* This is not for real; don't do the delivery. If there are
3786 any remaining hosts, list them. */
3787
3788 if (dont_deliver)
3789 {
3790 host_item *host2;
3791 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3792 for (addr = addrlist; addr; addr = addr->next)
3793 {
3794 addr->host_used = host;
3795 addr->special_action = '*';
3796 addr->message = US"delivery bypassed by -N option";
3797 }
3798 DEBUG(D_transport)
3799 {
3800 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3801 "*** host and remaining hosts:\n", tblock->name);
3802 for (host2 = host; host2; host2 = host2->next)
3803 debug_printf(" %s [%s]\n", host2->name,
3804 host2->address ? host2->address : US"unset");
3805 }
3806 rc = OK;
3807 }
3808
3809 /* This is for real. If the host is expired, we don't count it for
3810 hosts_max_retry. This ensures that all hosts must expire before an address
3811 is timed out, unless hosts_max_try_hardlimit (which protects against
3812 lunatic DNS configurations) is reached.
3813
3814 If the host is not expired and we are about to hit the hosts_max_retry
3815 limit, check to see if there is a subsequent hosts with a different MX
3816 value. If so, make that the next host, and don't count this one. This is a
3817 heuristic to make sure that different MXs do get tried. With a normal kind
3818 of retry rule, they would get tried anyway when the earlier hosts were
3819 delayed, but if the domain has a "retry every time" type of rule - as is
3820 often used for the the very large ISPs, that won't happen. */
3821
3822 else
3823 {
3824 host_item * thost;
3825 /* Make a copy of the host if it is local to this invocation
3826 of the transport. */
3827
3828 if (expanded_hosts)
3829 {
3830 thost = store_get(sizeof(host_item));
3831 *thost = *host;
3832 thost->name = string_copy(host->name);
3833 thost->address = string_copy(host->address);
3834 }
3835 else
3836 thost = host;
3837
3838 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3839 {
3840 host_item *h;
3841 DEBUG(D_transport)
3842 debug_printf("hosts_max_try limit reached with this host\n");
3843 for (h = host; h; h = h->next) if (h->mx != host->mx)
3844 {
3845 nexthost = h;
3846 unexpired_hosts_tried--;
3847 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3848 "and will be tried\n");
3849 break;
3850 }
3851 }
3852
3853 /* Attempt the delivery. */
3854
3855 total_hosts_tried++;
3856 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3857 &message_defer, FALSE);
3858
3859 /* Yield is one of:
3860 OK => connection made, each address contains its result;
3861 message_defer is set for message-specific defers (when all
3862 recipients are marked defer)
3863 DEFER => there was a non-message-specific delivery problem;
3864 ERROR => there was a problem setting up the arguments for a filter,
3865 or there was a problem with expanding added headers
3866 */
3867
3868 /* If the result is not OK, there was a non-message-specific problem.
3869 If the result is DEFER, we need to write to the logs saying what happened
3870 for this particular host, except in the case of authentication and TLS
3871 failures, where the log has already been written. If all hosts defer a
3872 general message is written at the end. */
3873
3874 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3875 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3876 write_logs(first_addr, host);
3877
3878 #ifndef DISABLE_EVENT
3879 if (rc == DEFER)
3880 deferred_event_raise(first_addr, host);
3881 #endif
3882
3883 /* If STARTTLS was accepted, but there was a failure in setting up the
3884 TLS session (usually a certificate screwup), and the host is not in
3885 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3886 TLS forcibly turned off. We have to start from scratch with a new SMTP
3887 connection. That's why the retry is done from here, not from within
3888 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3889 session, so the in-clear transmission after those errors, if permitted,
3890 happens inside smtp_deliver().] */
3891
3892 #ifdef SUPPORT_TLS
3893 if ( rc == DEFER
3894 && first_addr->basic_errno == ERRNO_TLSFAILURE
3895 && ob->tls_tempfail_tryclear
3896 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3897 )
3898 {
3899 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3900 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3901 first_addr = prepare_addresses(addrlist, host);
3902 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3903 &message_defer, TRUE);
3904 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3905 write_logs(first_addr, host);
3906 # ifndef DISABLE_EVENT
3907 if (rc == DEFER)
3908 deferred_event_raise(first_addr, host);
3909 # endif
3910 }
3911 #endif /*SUPPORT_TLS*/
3912 }
3913
3914 /* Delivery attempt finished */
3915
3916 rs = rc == OK ? US"OK"
3917 : rc == DEFER ? US"DEFER"
3918 : rc == ERROR ? US"ERROR"
3919 : US"?";
3920
3921 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3922 message_id, host->name, host->address, addrlist->address,
3923 addrlist->next ? " (& others)" : "", rs);
3924
3925 /* Release serialization if set up */
3926
3927 if (serialize_key) enq_end(serialize_key);
3928
3929 /* If the result is DEFER, or if a host retry record is known to exist, we
3930 need to add an item to the retry chain for updating the retry database
3931 at the end of delivery. We only need to add the item to the top address,
3932 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3933 for any other delivery attempts using the same address. (It is copied into
3934 the unusable tree at the outer level, so even if different address blocks
3935 contain the same address, it still won't get tried again.) */
3936
3937 if (rc == DEFER || retry_host_key)
3938 {
3939 int delete_flag = rc != DEFER ? rf_delete : 0;
3940 if (!retry_host_key)
3941 {
3942 BOOL incl_ip;
3943 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3944 US"retry_include_ip_address", ob->retry_include_ip_address,
3945 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3946 incl_ip = TRUE; /* error; use most-specific retry record */
3947
3948 retry_host_key = incl_ip
3949 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3950 : string_sprintf("T:%S%s", host->name, pistring);
3951 }
3952
3953 /* If a delivery of another message over an existing SMTP connection
3954 yields DEFER, we do NOT set up retry data for the host. This covers the
3955 case when there are delays in routing the addresses in the second message
3956 that are so long that the server times out. This is alleviated by not
3957 routing addresses that previously had routing defers when handling an
3958 existing connection, but even so, this case may occur (e.g. if a
3959 previously happily routed address starts giving routing defers). If the
3960 host is genuinely down, another non-continued message delivery will
3961 notice it soon enough. */
3962
3963 if (delete_flag != 0 || !continue_hostname)
3964 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3965
3966 /* We may have tried an expired host, if its retry time has come; ensure
3967 the status reflects the expiry for the benefit of any other addresses. */
3968
3969 if (rc == DEFER)
3970 {
3971 host->status = host_is_expired
3972 ? hstatus_unusable_expired : hstatus_unusable;
3973 host->why = hwhy_deferred;
3974 }
3975 }
3976
3977 /* If message_defer is set (host was OK, but every recipient got deferred
3978 because of some message-specific problem), or if that had happened
3979 previously so that a message retry key exists, add an appropriate item
3980 to the retry chain. Note that if there was a message defer but now there is
3981 a host defer, the message defer record gets deleted. That seems perfectly
3982 reasonable. Also, stop the message from being remembered as waiting
3983 for specific hosts. */
3984
3985 if (message_defer || retry_message_key)
3986 {
3987 int delete_flag = message_defer ? 0 : rf_delete;
3988 if (!retry_message_key)
3989 {
3990 BOOL incl_ip;
3991 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3992 US"retry_include_ip_address", ob->retry_include_ip_address,
3993 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3994 incl_ip = TRUE; /* error; use most-specific retry record */
3995
3996 retry_message_key = incl_ip
3997 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3998 message_id)
3999 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4000 }
4001 retry_add_item(addrlist, retry_message_key,
4002 rf_message | rf_host | delete_flag);
4003 update_waiting = FALSE;
4004 }
4005
4006 /* Any return other than DEFER (that is, OK or ERROR) means that the
4007 addresses have got their final statuses filled in for this host. In the OK
4008 case, see if any of them are deferred. */
4009
4010 if (rc == OK)
4011 for (addr = addrlist; addr; addr = addr->next)
4012 if (addr->transport_return == DEFER)
4013 {
4014 some_deferred = TRUE;
4015 break;
4016 }
4017
4018 /* If no addresses deferred or the result was ERROR, return. We do this for
4019 ERROR because a failing filter set-up or add_headers expansion is likely to
4020 fail for any host we try. */
4021
4022 if (rc == ERROR || (rc == OK && !some_deferred))
4023 {
4024 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4025 return TRUE; /* Each address has its status */
4026 }
4027
4028 /* If the result was DEFER or some individual addresses deferred, let
4029 the loop run to try other hosts with the deferred addresses, except for the
4030 case when we were trying to deliver down an existing channel and failed.
4031 Don't try any other hosts in this case. */
4032
4033 if (continue_hostname) break;
4034
4035 /* If the whole delivery, or some individual addresses, were deferred and
4036 there are more hosts that could be tried, do not count this host towards
4037 the hosts_max_try limit if the age of the message is greater than the
4038 maximum retry time for this host. This means we may try try all hosts,
4039 ignoring the limit, when messages have been around for some time. This is
4040 important because if we don't try all hosts, the address will never time
4041 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4042
4043 if ((rc == DEFER || some_deferred) && nexthost)
4044 {
4045 BOOL timedout;
4046 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4047
4048 if (retry && retry->rules)
4049 {
4050 retry_rule *last_rule;
4051 for (last_rule = retry->rules;
4052 last_rule->next;
4053 last_rule = last_rule->next);
4054 timedout = time(NULL) - received_time > last_rule->timeout;
4055 }
4056 else timedout = TRUE; /* No rule => timed out */
4057
4058 if (timedout)
4059 {
4060 unexpired_hosts_tried--;
4061 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4062 "hosts_max_try (message older than host's retry time)\n");
4063 }
4064 }
4065 } /* End of loop for trying multiple hosts. */
4066
4067 /* This is the end of the loop that repeats iff expired is TRUE and
4068 ob->delay_after_cutoff is FALSE. The second time round we will
4069 try those hosts that haven't been tried since the message arrived. */
4070
4071 DEBUG(D_transport)
4072 {
4073 debug_printf("all IP addresses skipped or deferred at least one address\n");
4074 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4075 debug_printf("retrying IP addresses not tried since message arrived\n");
4076 }
4077 }
4078
4079
4080 /* Get here if all IP addresses are skipped or defer at least one address. In
4081 MUA wrapper mode, this will happen only for connection or other non-message-
4082 specific failures. Force the delivery status for all addresses to FAIL. */
4083
4084 if (mua_wrapper)
4085 {
4086 for (addr = addrlist; addr; addr = addr->next)
4087 addr->transport_return = FAIL;
4088 goto END_TRANSPORT;
4089 }
4090
4091 /* In the normal, non-wrapper case, add a standard message to each deferred
4092 address if there hasn't been an error, that is, if it hasn't actually been
4093 tried this time. The variable "expired" will be FALSE if any deliveries were
4094 actually tried, or if there was at least one host that was not expired. That
4095 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4096 a delivery has been tried, an error code will be set, and the failing of the
4097 message is handled by the retry code later.
4098
4099 If queue_smtp is set, or this transport was called to send a subsequent message
4100 down an existing TCP/IP connection, and something caused the host not to be
4101 found, we end up here, but can detect these cases and handle them specially. */
4102
4103 for (addr = addrlist; addr; addr = addr->next)
4104 {
4105 /* If host is not NULL, it means that we stopped processing the host list
4106 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4107 means we need to behave as if some hosts were skipped because their retry
4108 time had not come. Specifically, this prevents the address from timing out.
4109 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4110 hosts were tried. */
4111
4112 if (host)
4113 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4114 {
4115 DEBUG(D_transport)
4116 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4117 "hosts were tried\n");
4118 }
4119 else
4120 {
4121 DEBUG(D_transport)
4122 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4123 setflag(addr, af_retry_skipped);
4124 }
4125
4126 if (queue_smtp) /* no deliveries attempted */
4127 {
4128 addr->transport_return = DEFER;
4129 addr->basic_errno = 0;
4130 addr->message = US"SMTP delivery explicitly queued";
4131 }
4132
4133 else if ( addr->transport_return == DEFER
4134 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4135 && !addr->message
4136 )
4137 {
4138 addr->basic_errno = ERRNO_HRETRY;
4139 if (continue_hostname)
4140 addr->message = US"no host found for existing SMTP connection";
4141 else if (expired)
4142 {
4143 setflag(addr, af_pass_message); /* This is not a security risk */
4144 addr->message = string_sprintf(
4145 "all hosts%s have been failing for a long time %s",
4146 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4147 ob->delay_after_cutoff
4148 ? US"(and retry time not reached)"
4149 : US"and were last tried after this message arrived");
4150
4151 /* If we are already using fallback hosts, or there are no fallback hosts
4152 defined, convert the result to FAIL to cause a bounce. */
4153
4154 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4155 addr->transport_return = FAIL;
4156 }
4157 else
4158 {
4159 const char * s;
4160 if (hosts_retry == hosts_total)
4161 s = "retry time not reached for any host%s";
4162 else if (hosts_fail == hosts_total)
4163 s = "all host address lookups%s failed permanently";
4164 else if (hosts_defer == hosts_total)
4165 s = "all host address lookups%s failed temporarily";
4166 else if (hosts_serial == hosts_total)
4167 s = "connection limit reached for all hosts%s";
4168 else if (hosts_fail+hosts_defer == hosts_total)
4169 s = "all host address lookups%s failed";
4170 else
4171 s = "some host address lookups failed and retry time "
4172 "not reached for other hosts or connection limit reached%s";
4173
4174 addr->message = string_sprintf(s,
4175 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4176 }
4177 }
4178 }
4179
4180 /* Update the database which keeps information about which messages are waiting
4181 for which hosts to become available. For some message-specific errors, the
4182 update_waiting flag is turned off because we don't want follow-on deliveries in
4183 those cases. If this transport instance is explicitly limited to one message
4184 per connection then follow-on deliveries are not possible and there's no need
4185 to create/update the per-transport wait-<transport_name> database. */
4186
4187 if (update_waiting && tblock->connection_max_messages != 1)
4188 transport_update_waiting(hostlist, tblock->name);
4189
4190 END_TRANSPORT:
4191
4192 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4193
4194 return TRUE; /* Each address has its status */
4195 }
4196
4197 /* vi: aw ai sw=2
4198 */
4199 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.