Logging: support +outgoing_port on defer lines and per-host error lines
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
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
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
252 #ifdef EXPERIMENTAL_SOCKS
253 ,NULL /* socks_proxy */
254 #endif
255 #ifdef SUPPORT_TLS
256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
263 NULL, /* tls_sni */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
271 #endif
272 #ifndef DISABLE_DKIM
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
279 #endif
280 };
281
282 /* some DSN flags for use later */
283
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
288
289
290
291 /* Local statics */
292
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
296
297
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
301
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
308
309 Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
316
317 Returns: OK always (FAIL, DEFER not used)
318 */
319
320 static int
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
323 {
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327 errmsg = errmsg; /* Keep picky compilers happy */
328 uid = uid;
329 gid = gid;
330
331 /* Pass back options if required. This interface is getting very messy. */
332
333 if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
345 }
346
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
349 list. */
350
351 if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358 return OK;
359 }
360
361
362
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
366
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
369 to be set up.
370
371 Argument: pointer to the transport instance block
372 Returns: nothing
373 */
374
375 void
376 smtp_transport_init(transport_instance *tblock)
377 {
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381 /* Retry_use_local_part defaults FALSE if unset */
382
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386 /* Set the default port according to the protocol */
387
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
391
392 /* Set up the setup entry point, to be called before subprocesses for this
393 transport. */
394
395 tblock->setup = smtp_transport_setup;
396
397 /* Complain if any of the timeouts are zero. */
398
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
407
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
412
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
414
415 #ifdef SUPPORT_TLS
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
422 #endif
423 }
424
425
426
427
428
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
432
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
435
436 Arguments:
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
445
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
449
450 Returns: nothing
451 */
452
453 static void
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458 #endif
459 )
460 {
461 address_item *addr;
462 int orvalue = 0;
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
470 {
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
480 {
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490 #endif
491 }
492 }
493 }
494
495 static void
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498 {
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502 #endif
503 );
504 }
505
506
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
510
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
515 chosen.
516
517 Arguments:
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
527 */
528
529 static BOOL
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
532 {
533 uschar *pl = US"";
534
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541 *yield = '4'; /* Default setting is to give a temporary error */
542
543 /* Handle response timeout */
544
545 if (*errno_value == ETIMEDOUT)
546 {
547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555 /* Handle malformed SMTP response */
556
557 if (*errno_value == ERRNO_SMTPFORMAT)
558 {
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
566 return FALSE;
567 }
568
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
570 end the DATA. */
571
572 if (*errno_value == ERRNO_FILTER_FAIL)
573 {
574 *message = US string_sprintf("transport filter process failed (%d)%s",
575 more_errno,
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
577 return FALSE;
578 }
579
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581 end the DATA. */
582
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591 /* Handle failure to write a complete data block */
592
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
599 #ifdef EXPERIMENTAL_INTERNATIONAL
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
602 {
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607 #endif
608
609 /* Handle error responses from the remote mailer. */
610
611 if (buffer[0] != 0)
612 {
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
617 *yield = buffer[0];
618 return TRUE;
619 }
620
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
626
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
628 {
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
632 }
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635 return FALSE;
636 }
637
638
639
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
643
644 /* This writes to the main log and to the message log.
645
646 Arguments:
647 addr the address item containing error information
648 host the current host
649
650 Returns: nothing
651 */
652
653 static void
654 write_logs(address_item *addr, host_item *host)
655 {
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
658 if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
661 if (addr->message)
662 {
663 message = string_sprintf("%s: %s", message, addr->message);
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669 else
670 {
671 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
672 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
673 strerror(addr->basic_errno));
674 }
675 }
676
677 static void
678 msglog_line(host_item * host, uschar * message)
679 {
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
682 }
683
684
685
686 #ifdef EXPERIMENTAL_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
690
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694 Arguments:
695 addr the address item containing error information
696 host the current host
697
698 Returns: nothing
699 */
700
701 static void
702 deferred_event_raise(address_item *addr, host_item *host)
703 {
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
706 uschar * save_local;
707
708 if (!action)
709 return;
710
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
713
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
718
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
723
724 (void) event_raise(action, US"msg:host:defer",
725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
736 }
737 #endif
738
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
742
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
748 of code.
749
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
754
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
763
764 Arguments:
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
780
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788 */
789
790 static int
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796 {
797 address_item *addr = *sync_addr;
798 int yield = 0;
799
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
803
804 if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
826 errno = save_errno;
827 }
828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
836 return -3;
837 }
838 }
839
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
844 */
845
846 while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
851 addr->host_used = host;
852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
861
862 if (testflag(addr, af_dr_retry_exists))
863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
868 }
869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
921
922 /* Log temporary errors if there are more hosts to be tried.
923 If not, log this last one in the == line. */
924
925 if (host->next)
926 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
927
928 /* Do not put this message on the list of those waiting for specific
929 hosts, as otherwise it is likely to be tried too often. */
930
931 update_waiting = FALSE;
932
933 /* Add a retry item for the address so that it doesn't get tried again
934 too soon. If address_retry_include_sender is true, add the sender address
935 to the retry key. */
936
937 if (address_retry_include_sender)
938 {
939 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
940 sender_address);
941 retry_add_item(addr, altkey, 0);
942 }
943 else retry_add_item(addr, addr->address_retry_key, 0);
944 }
945 }
946 } /* Loop for next RCPT response */
947
948 /* Update where to start at for the next block of responses, unless we
949 have already handled all the addresses. */
950
951 if (addr != NULL) *sync_addr = addr->next;
952
953 /* Handle a response to DATA. If we have not had any good recipients, either
954 previously or in this block, the response is ignored. */
955
956 if (pending_DATA != 0 &&
957 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
958 {
959 int code;
960 uschar *msg;
961 BOOL pass_message;
962 if (pending_DATA > 0 || (yield & 1) != 0)
963 {
964 if (errno == 0 && buffer[0] == '4')
965 {
966 errno = ERRNO_DATA4XX;
967 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
968 }
969 return -3;
970 }
971 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
972 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
973 "is in use and there were no good recipients\n", msg);
974 }
975
976 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
977 present) received 3xx. If any RCPTs were handled and yielded anything other
978 than 4xx, yield will be set non-zero. */
979
980 return yield;
981 }
982
983
984
985 /* Do the client side of smtp-level authentication */
986 /*
987 Arguments:
988 buffer EHLO response from server (gets overwritten)
989 addrlist chain of potential addresses to deliver
990 host host to deliver to
991 ob transport options
992 ibp, obp comms channel control blocks
993
994 Returns:
995 OK Success, or failed (but not required): global "smtp_authenticated" set
996 DEFER Failed authentication (and was required)
997 ERROR Internal problem
998
999 FAIL_SEND Failed communications - transmit
1000 FAIL - response
1001 */
1002
1003 int
1004 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1005 smtp_transport_options_block *ob, BOOL is_esmtp,
1006 smtp_inblock *ibp, smtp_outblock *obp)
1007 {
1008 int require_auth;
1009 uschar *fail_reason = US"server did not advertise AUTH support";
1010
1011 smtp_authenticated = FALSE;
1012 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1013 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1014
1015 if (is_esmtp && !regex_AUTH) regex_AUTH =
1016 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1017 FALSE, TRUE);
1018
1019 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1020 {
1021 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1022 expand_nmax = -1; /* reset */
1023
1024 /* Must not do this check until after we have saved the result of the
1025 regex match above. */
1026
1027 if (require_auth == OK ||
1028 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1029 {
1030 auth_instance *au;
1031 fail_reason = US"no common mechanisms were found";
1032
1033 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1034
1035 /* Scan the configured authenticators looking for one which is configured
1036 for use as a client, which is not suppressed by client_condition, and
1037 whose name matches an authentication mechanism supported by the server.
1038 If one is found, attempt to authenticate by calling its client function.
1039 */
1040
1041 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1042 {
1043 uschar *p = names;
1044 if (!au->client ||
1045 (au->client_condition != NULL &&
1046 !expand_check_condition(au->client_condition, au->name,
1047 US"client authenticator")))
1048 {
1049 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1050 au->name,
1051 (au->client)? "client_condition is false" :
1052 "not configured as a client");
1053 continue;
1054 }
1055
1056 /* Loop to scan supported server mechanisms */
1057
1058 while (*p != 0)
1059 {
1060 int rc;
1061 int len = Ustrlen(au->public_name);
1062 while (isspace(*p)) p++;
1063
1064 if (strncmpic(au->public_name, p, len) != 0 ||
1065 (p[len] != 0 && !isspace(p[len])))
1066 {
1067 while (*p != 0 && !isspace(*p)) p++;
1068 continue;
1069 }
1070
1071 /* Found data for a listed mechanism. Call its client entry. Set
1072 a flag in the outblock so that data is overwritten after sending so
1073 that reflections don't show it. */
1074
1075 fail_reason = US"authentication attempt(s) failed";
1076 obp->authenticating = TRUE;
1077 rc = (au->info->clientcode)(au, ibp, obp,
1078 ob->command_timeout, buffer, bufsize);
1079 obp->authenticating = FALSE;
1080 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1081 au->name, rc);
1082
1083 /* A temporary authentication failure must hold up delivery to
1084 this host. After a permanent authentication failure, we carry on
1085 to try other authentication methods. If all fail hard, try to
1086 deliver the message unauthenticated unless require_auth was set. */
1087
1088 switch(rc)
1089 {
1090 case OK:
1091 smtp_authenticated = TRUE; /* stops the outer loop */
1092 client_authenticator = au->name;
1093 if (au->set_client_id != NULL)
1094 client_authenticated_id = expand_string(au->set_client_id);
1095 break;
1096
1097 /* Failure after writing a command */
1098
1099 case FAIL_SEND:
1100 return FAIL_SEND;
1101
1102 /* Failure after reading a response */
1103
1104 case FAIL:
1105 if (errno != 0 || buffer[0] != '5') return FAIL;
1106 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1107 au->name, host->name, host->address, buffer);
1108 break;
1109
1110 /* Failure by some other means. In effect, the authenticator
1111 decided it wasn't prepared to handle this case. Typically this
1112 is the result of "fail" in an expansion string. Do we need to
1113 log anything here? Feb 2006: a message is now put in the buffer
1114 if logging is required. */
1115
1116 case CANCELLED:
1117 if (*buffer != 0)
1118 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1119 "authentication H=%s [%s] %s", au->name, host->name,
1120 host->address, buffer);
1121 break;
1122
1123 /* Internal problem, message in buffer. */
1124
1125 case ERROR:
1126 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1127 DEFER, FALSE);
1128 return ERROR;
1129 }
1130
1131 break; /* If not authenticated, try next authenticator */
1132 } /* Loop for scanning supported server mechanisms */
1133 } /* Loop for further authenticators */
1134 }
1135 }
1136
1137 /* If we haven't authenticated, but are required to, give up. */
1138
1139 if (require_auth == OK && !smtp_authenticated)
1140 {
1141 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1142 string_sprintf("authentication required but %s", fail_reason), DEFER,
1143 FALSE);
1144 return DEFER;
1145 }
1146
1147 return OK;
1148 }
1149
1150
1151 /* Construct AUTH appendix string for MAIL TO */
1152 /*
1153 Arguments
1154 buffer to build string
1155 addrlist chain of potential addresses to deliver
1156 ob transport options
1157
1158 Globals smtp_authenticated
1159 client_authenticated_sender
1160 Return True on error, otherwise buffer has (possibly empty) terminated string
1161 */
1162
1163 BOOL
1164 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1165 smtp_transport_options_block *ob)
1166 {
1167 uschar *local_authenticated_sender = authenticated_sender;
1168
1169 #ifdef notdef
1170 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1171 #endif
1172
1173 if (ob->authenticated_sender != NULL)
1174 {
1175 uschar *new = expand_string(ob->authenticated_sender);
1176 if (new == NULL)
1177 {
1178 if (!expand_string_forcedfail)
1179 {
1180 uschar *message = string_sprintf("failed to expand "
1181 "authenticated_sender: %s", expand_string_message);
1182 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1183 return TRUE;
1184 }
1185 }
1186 else if (new[0] != 0) local_authenticated_sender = new;
1187 }
1188
1189 /* Add the authenticated sender address if present */
1190
1191 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1192 local_authenticated_sender != NULL)
1193 {
1194 string_format(buffer, bufsize, " AUTH=%s",
1195 auth_xtextencode(local_authenticated_sender,
1196 Ustrlen(local_authenticated_sender)));
1197 client_authenticated_sender = string_copy(local_authenticated_sender);
1198 }
1199 else
1200 *buffer= 0;
1201
1202 return FALSE;
1203 }
1204
1205
1206
1207 #ifdef EXPERIMENTAL_DANE
1208 int
1209 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1210 BOOL dane_required, BOOL * dane)
1211 {
1212 /* move this out to host.c given the similarity to dns_lookup() ? */
1213 uschar buffer[300];
1214 const uschar * fullname = buffer;
1215
1216 /* TLSA lookup string */
1217 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1218
1219 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1220 {
1221 case DNS_AGAIN:
1222 return DEFER; /* just defer this TLS'd conn */
1223
1224 default:
1225 case DNS_FAIL:
1226 if (dane_required)
1227 return FAIL;
1228 break;
1229
1230 case DNS_SUCCEED:
1231 if (!dns_is_secure(dnsa))
1232 {
1233 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1234 return DEFER;
1235 }
1236 *dane = TRUE;
1237 break;
1238 }
1239 return OK;
1240 }
1241 #endif
1242
1243
1244
1245 typedef struct smtp_compare_s
1246 {
1247 uschar *current_sender_address;
1248 struct transport_instance *tblock;
1249 } smtp_compare_t;
1250
1251 /*
1252 Create a unique string that identifies this message, it is based on
1253 sender_address, helo_data and tls_certificate if enabled. */
1254
1255 static uschar *
1256 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1257 {
1258 address_item * addr1;
1259 uschar * if1 = US"";
1260 uschar * helo1 = US"";
1261 #ifdef SUPPORT_TLS
1262 uschar * tlsc1 = US"";
1263 #endif
1264 uschar * save_sender_address = sender_address;
1265 uschar * local_identity = NULL;
1266 smtp_transport_options_block * ob =
1267 (smtp_transport_options_block *)tblock->options_block;
1268
1269 sender_address = sender;
1270
1271 addr1 = deliver_make_addr (sender, TRUE);
1272 deliver_set_expansions(addr1);
1273
1274 if (ob->interface)
1275 if1 = expand_string(ob->interface);
1276
1277 if (ob->helo_data)
1278 helo1 = expand_string(ob->helo_data);
1279
1280 #ifdef SUPPORT_TLS
1281 if (ob->tls_certificate)
1282 tlsc1 = expand_string(ob->tls_certificate);
1283 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1284 #else
1285 local_identity = string_sprintf ("%s^%s", if1, helo1);
1286 #endif
1287
1288 deliver_set_expansions(NULL);
1289 sender_address = save_sender_address;
1290
1291 return local_identity;
1292 }
1293
1294
1295
1296 /* This routine is a callback that is called from transport_check_waiting.
1297 This function will evaluate the incoming message versus the previous
1298 message. If the incoming message is using a different local identity then
1299 we will veto this new message. */
1300
1301 static BOOL
1302 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1303 {
1304
1305 uschar * message_local_identity,
1306 * current_local_identity,
1307 * new_sender_address;
1308
1309 current_local_identity =
1310 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1311
1312 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1313 return 0;
1314
1315 message_local_identity =
1316 smtp_local_identity(new_sender_address, s_compare->tblock);
1317
1318 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1319 }
1320
1321
1322
1323 /*************************************************
1324 * Deliver address list to given host *
1325 *************************************************/
1326
1327 /* If continue_hostname is not null, we get here only when continuing to
1328 deliver down an existing channel. The channel was passed as the standard
1329 input. TLS is never active on a passed channel; the previous process always
1330 closes it down before passing the connection on.
1331
1332 Otherwise, we have to make a connection to the remote host, and do the
1333 initial protocol exchange.
1334
1335 When running as an MUA wrapper, if the sender or any recipient is rejected,
1336 temporarily or permanently, we force failure for all recipients.
1337
1338 Arguments:
1339 addrlist chain of potential addresses to deliver; only those whose
1340 transport_return field is set to PENDING_DEFER are currently
1341 being processed; others should be skipped - they have either
1342 been delivered to an earlier host or IP address, or been
1343 failed by one of them.
1344 host host to deliver to
1345 host_af AF_INET or AF_INET6
1346 port default TCP/IP port to use, in host byte order
1347 interface interface to bind to, or NULL
1348 tblock transport instance block
1349 message_defer set TRUE if yield is OK, but all addresses were deferred
1350 because of a non-recipient, non-host failure, that is, a
1351 4xx response to MAIL FROM, DATA, or ".". This is a defer
1352 that is specific to the message.
1353 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1354 a second attempt after TLS initialization fails
1355
1356 Returns: OK - the connection was made and the delivery attempted;
1357 the result for each address is in its data block.
1358 DEFER - the connection could not be made, or something failed
1359 while setting up the SMTP session, or there was a
1360 non-message-specific error, such as a timeout.
1361 ERROR - a filter command is specified for this transport,
1362 and there was a problem setting it up; OR helo_data
1363 or add_headers or authenticated_sender is specified
1364 for this transport, and the string failed to expand
1365 */
1366
1367 static int
1368 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1369 uschar *interface, transport_instance *tblock,
1370 BOOL *message_defer, BOOL suppress_tls)
1371 {
1372 address_item *addr;
1373 address_item *sync_addr;
1374 address_item *first_addr = addrlist;
1375 int yield = OK;
1376 int address_count;
1377 int save_errno;
1378 int rc;
1379 time_t start_delivery_time = time(NULL);
1380 smtp_transport_options_block *ob =
1381 (smtp_transport_options_block *)(tblock->options_block);
1382 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1383 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1384 BOOL ok = FALSE;
1385 BOOL send_rset = TRUE;
1386 BOOL send_quit = TRUE;
1387 BOOL setting_up = TRUE;
1388 BOOL completed_address = FALSE;
1389 BOOL esmtp = TRUE;
1390 BOOL pending_MAIL;
1391 BOOL pass_message = FALSE;
1392 #ifndef DISABLE_PRDR
1393 BOOL prdr_offered = FALSE;
1394 BOOL prdr_active;
1395 #endif
1396 #ifdef EXPERIMENTAL_INTERNATIONAL
1397 BOOL utf8_needed = FALSE;
1398 BOOL utf8_offered = FALSE;
1399 #endif
1400 BOOL dsn_all_lasthop = TRUE;
1401 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1402 BOOL dane = FALSE;
1403 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1404 dns_answer tlsa_dnsa;
1405 #endif
1406 smtp_inblock inblock;
1407 smtp_outblock outblock;
1408 int max_rcpt = tblock->max_addresses;
1409 uschar *igquotstr = US"";
1410
1411 #ifdef EXPERIMENTAL_DSN_INFO
1412 uschar *smtp_greeting = NULL;
1413 uschar *helo_response = NULL;
1414 #endif
1415 uschar *helo_data = NULL;
1416
1417 uschar *message = NULL;
1418 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1419 uschar *p;
1420 uschar buffer[4096];
1421 uschar inbuffer[4096];
1422 uschar outbuffer[4096];
1423
1424 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1425
1426 *message_defer = FALSE;
1427 smtp_command = US"initial connection";
1428 if (max_rcpt == 0) max_rcpt = 999999;
1429
1430 /* Set up the buffer for reading SMTP response packets. */
1431
1432 inblock.buffer = inbuffer;
1433 inblock.buffersize = sizeof(inbuffer);
1434 inblock.ptr = inbuffer;
1435 inblock.ptrend = inbuffer;
1436
1437 /* Set up the buffer for holding SMTP commands while pipelining */
1438
1439 outblock.buffer = outbuffer;
1440 outblock.buffersize = sizeof(outbuffer);
1441 outblock.ptr = outbuffer;
1442 outblock.cmd_count = 0;
1443 outblock.authenticating = FALSE;
1444
1445 /* Reset the parameters of a TLS session. */
1446
1447 tls_out.bits = 0;
1448 tls_out.cipher = NULL; /* the one we may use for this transport */
1449 tls_out.ourcert = NULL;
1450 tls_out.peercert = NULL;
1451 tls_out.peerdn = NULL;
1452 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1453 tls_out.sni = NULL;
1454 #endif
1455 tls_out.ocsp = OCSP_NOT_REQ;
1456
1457 /* Flip the legacy TLS-related variables over to the outbound set in case
1458 they're used in the context of the transport. Don't bother resetting
1459 afterward as we're in a subprocess. */
1460
1461 tls_modify_variables(&tls_out);
1462
1463 #ifndef SUPPORT_TLS
1464 if (smtps)
1465 {
1466 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1467 DEFER, FALSE);
1468 return ERROR;
1469 }
1470 #endif
1471
1472 /* Make a connection to the host if this isn't a continued delivery, and handle
1473 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1474 specially so they can be identified for retries. */
1475
1476 if (continue_hostname == NULL)
1477 {
1478 /* This puts port into host->port */
1479 inblock.sock = outblock.sock =
1480 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1481
1482 if (inblock.sock < 0)
1483 {
1484 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1485 NULL, DEFER, FALSE);
1486 return DEFER;
1487 }
1488
1489 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1490 {
1491 tls_out.dane_verified = FALSE;
1492 tls_out.tlsa_usage = 0;
1493
1494 if (host->dnssec == DS_YES)
1495 {
1496 if( ( dane_required
1497 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1498 )
1499 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1500 && dane_required /* do not error on only dane-requested */
1501 )
1502 {
1503 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1504 string_sprintf("DANE error: tlsa lookup %s",
1505 rc == DEFER ? "DEFER" : "FAIL"),
1506 rc, FALSE);
1507 return rc;
1508 }
1509 }
1510 else if (dane_required)
1511 {
1512 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1513 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1514 FAIL, FALSE);
1515 return FAIL;
1516 }
1517
1518 if (dane)
1519 ob->tls_tempfail_tryclear = FALSE;
1520 }
1521 #endif /*DANE*/
1522
1523 /* Expand the greeting message while waiting for the initial response. (Makes
1524 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1525 delayed till here so that $sending_interface and $sending_port are set. */
1526
1527 helo_data = expand_string(ob->helo_data);
1528 #ifdef EXPERIMENTAL_INTERNATIONAL
1529 if (helo_data)
1530 {
1531 uschar * errstr = NULL;
1532 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1533 {
1534 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1535 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1536 yield = DEFER;
1537 goto SEND_QUIT;
1538 }
1539 }
1540 #endif
1541
1542 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1543 is nevertheless a reasonably clean way of programming this kind of logic,
1544 where you want to escape on any error. */
1545
1546 if (!smtps)
1547 {
1548 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1549 '2', ob->command_timeout);
1550 #ifdef EXPERIMENTAL_DSN_INFO
1551 smtp_greeting = string_copy(buffer);
1552 #endif
1553 if (!good_response) goto RESPONSE_FAILED;
1554
1555 #ifdef EXPERIMENTAL_EVENT
1556 {
1557 uschar * s;
1558 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1559 : host->dnssec==DS_NO ? US"no" : NULL;
1560 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1561 if (s)
1562 {
1563 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1564 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1565 DEFER, FALSE);
1566 yield = DEFER;
1567 goto SEND_QUIT;
1568 }
1569 }
1570 #endif
1571
1572 /* Now check if the helo_data expansion went well, and sign off cleanly if
1573 it didn't. */
1574
1575 if (helo_data == NULL)
1576 {
1577 uschar *message = string_sprintf("failed to expand helo_data: %s",
1578 expand_string_message);
1579 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1580 yield = DEFER;
1581 goto SEND_QUIT;
1582 }
1583 }
1584
1585 /** Debugging without sending a message
1586 addrlist->transport_return = DEFER;
1587 goto SEND_QUIT;
1588 **/
1589
1590 /* Errors that occur after this point follow an SMTP command, which is
1591 left in big_buffer by smtp_write_command() for use in error messages. */
1592
1593 smtp_command = big_buffer;
1594
1595 /* Tell the remote who we are...
1596
1597 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1598 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1599 greeting is of this form. The assumption was that the far end supports it
1600 properly... but experience shows that there are some that give 5xx responses,
1601 even though the banner includes "ESMTP" (there's a bloody-minded one that
1602 says "ESMTP not spoken here"). Cope with that case.
1603
1604 September 2000: Time has passed, and it seems reasonable now to always send
1605 EHLO at the start. It is also convenient to make the change while installing
1606 the TLS stuff.
1607
1608 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1609 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1610 would be no way to send out the mails, so there is now a host list
1611 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1612 PIPELINING problem as well. Maybe it can also be useful to cure other
1613 problems with broken servers.
1614
1615 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1616 Then somebody tried it with a Microsoft mailer... It seems that all other
1617 mailers use upper case for some reason (the RFC is quite clear about case
1618 independence) so, for peace of mind, I gave in. */
1619
1620 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1621
1622 /* Alas; be careful, since this goto is not an error-out, so conceivably
1623 we might set data between here and the target which we assume to exist
1624 and be usable. I can see this coming back to bite us. */
1625 #ifdef SUPPORT_TLS
1626 if (smtps)
1627 {
1628 tls_offered = TRUE;
1629 suppress_tls = FALSE;
1630 ob->tls_tempfail_tryclear = FALSE;
1631 smtp_command = US"SSL-on-connect";
1632 goto TLS_NEGOTIATE;
1633 }
1634 #endif
1635
1636 if (esmtp)
1637 {
1638 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1639 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1640 goto SEND_FAILED;
1641 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1642 ob->command_timeout))
1643 {
1644 if (errno != 0 || buffer[0] == 0 || lmtp)
1645 {
1646 #ifdef EXPERIMENTAL_DSN_INFO
1647 helo_response = string_copy(buffer);
1648 #endif
1649 goto RESPONSE_FAILED;
1650 }
1651 esmtp = FALSE;
1652 }
1653 #ifdef EXPERIMENTAL_DSN_INFO
1654 helo_response = string_copy(buffer);
1655 #endif
1656 }
1657 else
1658 {
1659 DEBUG(D_transport)
1660 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1661 }
1662
1663 if (!esmtp)
1664 {
1665 BOOL good_response;
1666
1667 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1668 goto SEND_FAILED;
1669 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1670 '2', ob->command_timeout);
1671 #ifdef EXPERIMENTAL_DSN_INFO
1672 helo_response = string_copy(buffer);
1673 #endif
1674 if (!good_response) goto RESPONSE_FAILED;
1675 }
1676
1677 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1678 lmtp_ignore_quota option was set. */
1679
1680 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1681 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1682 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1683
1684 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1685
1686 #ifdef SUPPORT_TLS
1687 tls_offered = esmtp &&
1688 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1689 PCRE_EOPT, NULL, 0) >= 0;
1690 #endif
1691
1692 #ifndef DISABLE_PRDR
1693 prdr_offered = esmtp
1694 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1695 PCRE_EOPT, NULL, 0) >= 0
1696 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1697
1698 if (prdr_offered)
1699 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1700 #endif
1701
1702 #ifdef EXPERIMENTAL_INTERNATIONAL
1703 if (addrlist->prop.utf8_msg)
1704 {
1705 utf8_needed = !addrlist->prop.utf8_downcvt
1706 && !addrlist->prop.utf8_downcvt_maybe;
1707 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1708 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1709
1710 utf8_offered = esmtp
1711 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1712 PCRE_EOPT, NULL, 0) >= 0;
1713 }
1714 #endif
1715 }
1716
1717 /* For continuing deliveries down the same channel, the socket is the standard
1718 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1719 below). Set up the pointer to where subsequent commands will be left, for
1720 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1721 set from the command line if they were set in the process that passed the
1722 connection on. */
1723
1724 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1725 as the contine goes via transport_pass_socket() and doublefork and exec.
1726 It does not wait. Unclear how we keep separate host's responses
1727 separate - we could match up by host ip+port as a bodge. */
1728
1729 else
1730 {
1731 inblock.sock = outblock.sock = fileno(stdin);
1732 smtp_command = big_buffer;
1733 host->port = port; /* Record the port that was used */
1734 }
1735
1736 /* If TLS is available on this connection, whether continued or not, attempt to
1737 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1738 send another EHLO - the server may give a different answer in secure mode. We
1739 use a separate buffer for reading the response to STARTTLS so that if it is
1740 negative, the original EHLO data is available for subsequent analysis, should
1741 the client not be required to use TLS. If the response is bad, copy the buffer
1742 for error analysis. */
1743
1744 #ifdef SUPPORT_TLS
1745 if ( tls_offered
1746 && !suppress_tls
1747 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1748 {
1749 uschar buffer2[4096];
1750 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1751 goto SEND_FAILED;
1752
1753 /* If there is an I/O error, transmission of this message is deferred. If
1754 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1755 false, we also defer. However, if there is a temporary rejection of STARTTLS
1756 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1757 STARTTLS, we carry on. This means we will try to send the message in clear,
1758 unless the host is in hosts_require_tls (tested below). */
1759
1760 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1761 ob->command_timeout))
1762 {
1763 if (errno != 0 || buffer2[0] == 0 ||
1764 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1765 {
1766 Ustrncpy(buffer, buffer2, sizeof(buffer));
1767 goto RESPONSE_FAILED;
1768 }
1769 }
1770
1771 /* STARTTLS accepted: try to negotiate a TLS session. */
1772
1773 else
1774 TLS_NEGOTIATE:
1775 {
1776 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1777 # ifdef EXPERIMENTAL_DANE
1778 , dane ? &tlsa_dnsa : NULL
1779 # endif
1780 );
1781
1782 /* TLS negotiation failed; give an error. From outside, this function may
1783 be called again to try in clear on a new connection, if the options permit
1784 it for this host. */
1785
1786 if (rc != OK)
1787 {
1788 # ifdef EXPERIMENTAL_DANE
1789 if (rc == DEFER && dane && !dane_required)
1790 {
1791 log_write(0, LOG_MAIN, "DANE attempt failed;"
1792 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1793 host->name, host->address);
1794 dane = FALSE;
1795 goto TLS_NEGOTIATE;
1796 }
1797 # endif
1798
1799 save_errno = ERRNO_TLSFAILURE;
1800 message = US"failure while setting up TLS session";
1801 send_quit = FALSE;
1802 goto TLS_FAILED;
1803 }
1804
1805 /* TLS session is set up */
1806
1807 for (addr = addrlist; addr; addr = addr->next)
1808 if (addr->transport_return == PENDING_DEFER)
1809 {
1810 addr->cipher = tls_out.cipher;
1811 addr->ourcert = tls_out.ourcert;
1812 addr->peercert = tls_out.peercert;
1813 addr->peerdn = tls_out.peerdn;
1814 addr->ocsp = tls_out.ocsp;
1815 }
1816 }
1817 }
1818
1819 /* if smtps, we'll have smtp_command set to something else; always safe to
1820 reset it here. */
1821 smtp_command = big_buffer;
1822
1823 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1824 helo_data is null, we are dealing with a connection that was passed from
1825 another process, and so we won't have expanded helo_data above. We have to
1826 expand it here. $sending_ip_address and $sending_port are set up right at the
1827 start of the Exim process (in exim.c). */
1828
1829 if (tls_out.active >= 0)
1830 {
1831 char *greeting_cmd;
1832 BOOL good_response;
1833
1834 if (helo_data == NULL)
1835 {
1836 helo_data = expand_string(ob->helo_data);
1837 if (helo_data == NULL)
1838 {
1839 uschar *message = string_sprintf("failed to expand helo_data: %s",
1840 expand_string_message);
1841 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1842 yield = DEFER;
1843 goto SEND_QUIT;
1844 }
1845 }
1846
1847 /* For SMTPS we need to wait for the initial OK response. */
1848 if (smtps)
1849 {
1850 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1851 '2', ob->command_timeout);
1852 #ifdef EXPERIMENTAL_DSN_INFO
1853 smtp_greeting = string_copy(buffer);
1854 #endif
1855 if (!good_response) goto RESPONSE_FAILED;
1856 }
1857
1858 if (esmtp)
1859 greeting_cmd = "EHLO";
1860 else
1861 {
1862 greeting_cmd = "HELO";
1863 DEBUG(D_transport)
1864 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1865 }
1866
1867 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1868 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1869 goto SEND_FAILED;
1870 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1871 '2', ob->command_timeout);
1872 #ifdef EXPERIMENTAL_DSN_INFO
1873 helo_response = string_copy(buffer);
1874 #endif
1875 if (!good_response) goto RESPONSE_FAILED;
1876 }
1877
1878 /* If the host is required to use a secure channel, ensure that we
1879 have one. */
1880
1881 else if (
1882 # ifdef EXPERIMENTAL_DANE
1883 dane ||
1884 # endif
1885 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1886 )
1887 {
1888 save_errno = ERRNO_TLSREQUIRED;
1889 message = string_sprintf("a TLS session is required, but %s",
1890 tls_offered? "an attempt to start TLS failed" :
1891 "the server did not offer TLS support");
1892 goto TLS_FAILED;
1893 }
1894 #endif /*SUPPORT_TLS*/
1895
1896 /* If TLS is active, we have just started it up and re-done the EHLO command,
1897 so its response needs to be analyzed. If TLS is not active and this is a
1898 continued session down a previously-used socket, we haven't just done EHLO, so
1899 we skip this. */
1900
1901 if (continue_hostname == NULL
1902 #ifdef SUPPORT_TLS
1903 || tls_out.active >= 0
1904 #endif
1905 )
1906 {
1907 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1908 lmtp_ignore_quota option was set. */
1909
1910 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1911 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1912 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1913
1914 /* If the response to EHLO specified support for the SIZE parameter, note
1915 this, provided size_addition is non-negative. */
1916
1917 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1918 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1919 PCRE_EOPT, NULL, 0) >= 0;
1920
1921 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1922 the current host, esmtp will be false, so PIPELINING can never be used. If
1923 the current host matches hosts_avoid_pipelining, don't do it. */
1924
1925 smtp_use_pipelining = esmtp
1926 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1927 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1928 PCRE_EOPT, NULL, 0) >= 0;
1929
1930 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1931 smtp_use_pipelining? "" : "not ");
1932
1933 #ifndef DISABLE_PRDR
1934 prdr_offered = esmtp
1935 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1936 PCRE_EOPT, NULL, 0) >= 0
1937 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1938
1939 if (prdr_offered)
1940 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1941 #endif
1942
1943 #ifdef EXPERIMENTAL_INTERNATIONAL
1944 if (addrlist->prop.utf8_msg)
1945 utf8_offered = esmtp
1946 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1947 PCRE_EOPT, NULL, 0) >= 0;
1948 #endif
1949
1950 /* Note if the server supports DSN */
1951 smtp_use_dsn = esmtp
1952 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1953 PCRE_EOPT, NULL, 0) >= 0;
1954 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1955
1956 /* Note if the response to EHLO specifies support for the AUTH extension.
1957 If it has, check that this host is one we want to authenticate to, and do
1958 the business. The host name and address must be available when the
1959 authenticator's client driver is running. */
1960
1961 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1962 ob, esmtp, &inblock, &outblock))
1963 {
1964 default: goto SEND_QUIT;
1965 case OK: break;
1966 case FAIL_SEND: goto SEND_FAILED;
1967 case FAIL: goto RESPONSE_FAILED;
1968 }
1969 }
1970
1971 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1972 message-specific. */
1973
1974 setting_up = FALSE;
1975
1976 #ifdef EXPERIMENTAL_INTERNATIONAL
1977 /* If this is an international message we need the host to speak SMTPUTF8 */
1978 if (utf8_needed && !utf8_offered)
1979 {
1980 errno = ERRNO_UTF8_FWD;
1981 goto RESPONSE_FAILED;
1982 }
1983 #endif
1984
1985 /* If there is a filter command specified for this transport, we can now
1986 set it up. This cannot be done until the identify of the host is known. */
1987
1988 if (tblock->filter_command != NULL)
1989 {
1990 BOOL rc;
1991 uschar buffer[64];
1992 sprintf(CS buffer, "%.50s transport", tblock->name);
1993 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1994 TRUE, DEFER, addrlist, buffer, NULL);
1995 transport_filter_timeout = tblock->filter_timeout;
1996
1997 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1998 yield ERROR. */
1999
2000 if (!rc)
2001 {
2002 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2003 FALSE);
2004 yield = ERROR;
2005 goto SEND_QUIT;
2006 }
2007 }
2008
2009
2010 /* For messages that have more than the maximum number of envelope recipients,
2011 we want to send several transactions down the same SMTP connection. (See
2012 comments in deliver.c as to how this reconciles, heuristically, with
2013 remote_max_parallel.) This optimization was added to Exim after the following
2014 code was already working. The simplest way to put it in without disturbing the
2015 code was to use a goto to jump back to this point when there is another
2016 transaction to handle. */
2017
2018 SEND_MESSAGE:
2019 sync_addr = first_addr;
2020 address_count = 0;
2021 ok = FALSE;
2022 send_rset = TRUE;
2023 completed_address = FALSE;
2024
2025
2026 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2027 qualification, send it, adding something to the message size to allow for
2028 imprecision and things that get added en route. Exim keeps the number of lines
2029 in a message, so we can give an accurate value for the original message, but we
2030 need some additional to handle added headers. (Double "." characters don't get
2031 included in the count.) */
2032
2033 p = buffer;
2034 *p = 0;
2035
2036 if (smtp_use_size)
2037 {
2038 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2039 while (*p) p++;
2040 }
2041
2042 #ifndef DISABLE_PRDR
2043 prdr_active = FALSE;
2044 if (prdr_offered)
2045 {
2046 for (addr = first_addr; addr; addr = addr->next)
2047 if (addr->transport_return == PENDING_DEFER)
2048 {
2049 for (addr = addr->next; addr; addr = addr->next)
2050 if (addr->transport_return == PENDING_DEFER)
2051 { /* at least two recipients to send */
2052 prdr_active = TRUE;
2053 sprintf(CS p, " PRDR"); p += 5;
2054 break;
2055 }
2056 break;
2057 }
2058 }
2059 #endif
2060
2061 #ifdef EXPERIMENTAL_INTERNATIONAL
2062 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
2063 sprintf(CS p, " SMTPUTF8"), p += 9;
2064 #endif
2065
2066 /* check if all addresses have lasthop flag */
2067 /* do not send RET and ENVID if true */
2068 for (dsn_all_lasthop = TRUE, addr = first_addr;
2069 address_count < max_rcpt && addr != NULL;
2070 addr = addr->next)
2071 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2072 {
2073 dsn_all_lasthop = FALSE;
2074 break;
2075 }
2076
2077 /* Add any DSN flags to the mail command */
2078
2079 if (smtp_use_dsn && !dsn_all_lasthop)
2080 {
2081 if (dsn_ret == dsn_ret_hdrs)
2082 {
2083 Ustrcpy(p, " RET=HDRS");
2084 while (*p) p++;
2085 }
2086 else if (dsn_ret == dsn_ret_full)
2087 {
2088 Ustrcpy(p, " RET=FULL");
2089 while (*p) p++;
2090 }
2091 if (dsn_envid != NULL)
2092 {
2093 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2094 while (*p) p++;
2095 }
2096 }
2097
2098 /* If an authenticated_sender override has been specified for this transport
2099 instance, expand it. If the expansion is forced to fail, and there was already
2100 an authenticated_sender for this message, the original value will be used.
2101 Other expansion failures are serious. An empty result is ignored, but there is
2102 otherwise no check - this feature is expected to be used with LMTP and other
2103 cases where non-standard addresses (e.g. without domains) might be required. */
2104
2105 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2106 {
2107 yield = ERROR;
2108 goto SEND_QUIT;
2109 }
2110
2111 /* From here until we send the DATA command, we can make use of PIPELINING
2112 if the server host supports it. The code has to be able to check the responses
2113 at any point, for when the buffer fills up, so we write it totally generally.
2114 When PIPELINING is off, each command written reports that it has flushed the
2115 buffer. */
2116
2117 pending_MAIL = TRUE; /* The block starts with MAIL */
2118
2119 {
2120 uschar * s = return_path;
2121 #ifdef EXPERIMENTAL_INTERNATIONAL
2122 uschar * errstr = NULL;
2123
2124 /* If we must downconvert, do the from-address here. Remember we had to
2125 for the to-addresses (done below), and also (ugly) for re-doing when building
2126 the delivery log line. */
2127
2128 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2129 {
2130 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2131 {
2132 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2133 yield = ERROR;
2134 goto SEND_QUIT;
2135 }
2136 setflag(addrlist, af_utf8_downcvt);
2137 }
2138 #endif
2139
2140 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2141 "MAIL FROM:<%s>%s\r\n", s, buffer);
2142 }
2143
2144 mail_command = string_copy(big_buffer); /* Save for later error message */
2145
2146 switch(rc)
2147 {
2148 case -1: /* Transmission error */
2149 goto SEND_FAILED;
2150
2151 case +1: /* Block was sent */
2152 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2153 ob->command_timeout))
2154 {
2155 if (errno == 0 && buffer[0] == '4')
2156 {
2157 errno = ERRNO_MAIL4XX;
2158 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2159 }
2160 goto RESPONSE_FAILED;
2161 }
2162 pending_MAIL = FALSE;
2163 break;
2164 }
2165
2166 /* Pass over all the relevant recipient addresses for this host, which are the
2167 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2168 several before we have to read the responses for those seen so far. This
2169 checking is done by a subroutine because it also needs to be done at the end.
2170 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2171 the next one if not all are sent.
2172
2173 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2174 last address because we want to abort if any recipients have any kind of
2175 problem, temporary or permanent. We know that all recipient addresses will have
2176 the PENDING_DEFER status, because only one attempt is ever made, and we know
2177 that max_rcpt will be large, so all addresses will be done at once. */
2178
2179 for (addr = first_addr;
2180 address_count < max_rcpt && addr != NULL;
2181 addr = addr->next)
2182 {
2183 int count;
2184 BOOL no_flush;
2185 uschar * rcpt_addr;
2186
2187 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2188
2189 if (addr->transport_return != PENDING_DEFER) continue;
2190
2191 address_count++;
2192 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2193
2194 /* Add any DSN flags to the rcpt command and add to the sent string */
2195
2196 p = buffer;
2197 *p = 0;
2198
2199 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2200 {
2201 if ((addr->dsn_flags & rf_dsnflags) != 0)
2202 {
2203 int i;
2204 BOOL first = TRUE;
2205 Ustrcpy(p, " NOTIFY=");
2206 while (*p) p++;
2207 for (i = 0; i < 4; i++)
2208 if ((addr->dsn_flags & rf_list[i]) != 0)
2209 {
2210 if (!first) *p++ = ',';
2211 first = FALSE;
2212 Ustrcpy(p, rf_names[i]);
2213 while (*p) p++;
2214 }
2215 }
2216
2217 if (addr->dsn_orcpt != NULL)
2218 {
2219 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2220 addr->dsn_orcpt);
2221 while (*p) p++;
2222 }
2223 }
2224
2225 /* Now send the RCPT command, and process outstanding responses when
2226 necessary. After a timeout on RCPT, we just end the function, leaving the
2227 yield as OK, because this error can often mean that there is a problem with
2228 just one address, so we don't want to delay the host. */
2229
2230 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2231
2232 #ifdef EXPERIMENTAL_INTERNATIONAL
2233 {
2234 uschar * dummy_errstr;
2235 if ( testflag(addrlist, af_utf8_downcvt)
2236 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2237 dummy_errstr
2238 ) )
2239 {
2240 errno = ERRNO_EXPANDFAIL;
2241 goto SEND_FAILED;
2242 }
2243 }
2244 #endif
2245
2246 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2247 rcpt_addr, igquotstr, buffer);
2248
2249 if (count < 0) goto SEND_FAILED;
2250 if (count > 0)
2251 {
2252 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2253 &sync_addr, host, count, ob->address_retry_include_sender,
2254 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2255 sizeof(buffer)))
2256 {
2257 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2258 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2259 break;
2260
2261 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2262 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2263 case 0: /* No 2xx or 5xx, but no probs */
2264 break;
2265
2266 case -1: goto END_OFF; /* Timeout on RCPT */
2267 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2268 }
2269 pending_MAIL = FALSE; /* Dealt with MAIL */
2270 }
2271 } /* Loop for next address */
2272
2273 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2274 permanently or temporarily. We should have flushed and synced after the last
2275 RCPT. */
2276
2277 if (mua_wrapper)
2278 {
2279 address_item *badaddr;
2280 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2281 if (badaddr->transport_return != PENDING_OK)
2282 {
2283 /*XXX could we find a better errno than 0 here? */
2284 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2285 testflag(badaddr, af_pass_message));
2286 ok = FALSE;
2287 break;
2288 }
2289 }
2290
2291 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2292 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2293 have a good recipient buffered up if we are pipelining. We don't want to waste
2294 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2295 are pipelining. The responses are all handled by sync_responses(). */
2296
2297 if (ok || (smtp_use_pipelining && !mua_wrapper))
2298 {
2299 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2300 if (count < 0) goto SEND_FAILED;
2301 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2302 host, count, ob->address_retry_include_sender, pending_MAIL,
2303 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2304 {
2305 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2306 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2307 break;
2308
2309 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2310 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2311 case 0: break; /* No 2xx or 5xx, but no probs */
2312
2313 case -1: goto END_OFF; /* Timeout on RCPT */
2314 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2315 }
2316 }
2317
2318 /* Save the first address of the next batch. */
2319
2320 first_addr = addr;
2321
2322 /* If there were no good recipients (but otherwise there have been no
2323 problems), just set ok TRUE, since we have handled address-specific errors
2324 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2325 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2326 well as body. Set the appropriate timeout value to be used for each chunk.
2327 (Haven't been able to make it work using select() for writing yet.) */
2328
2329 if (!ok) ok = TRUE; else
2330 {
2331 sigalrm_seen = FALSE;
2332 transport_write_timeout = ob->data_timeout;
2333 smtp_command = US"sending data block"; /* For error messages */
2334 DEBUG(D_transport|D_v)
2335 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2336 transport_count = 0;
2337
2338 #ifndef DISABLE_DKIM
2339 ok = dkim_transport_write_message(addrlist, inblock.sock,
2340 topt_use_crlf | topt_end_dot | topt_escape_headers |
2341 (tblock->body_only? topt_no_headers : 0) |
2342 (tblock->headers_only? topt_no_body : 0) |
2343 (tblock->return_path_add? topt_add_return_path : 0) |
2344 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2345 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2346 0, /* No size limit */
2347 tblock->add_headers, tblock->remove_headers,
2348 US".", US"..", /* Escaping strings */
2349 tblock->rewrite_rules, tblock->rewrite_existflags,
2350 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2351 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2352 );
2353 #else
2354 ok = transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2361 0, /* No size limit */
2362 tblock->add_headers, tblock->remove_headers,
2363 US".", US"..", /* Escaping strings */
2364 tblock->rewrite_rules, tblock->rewrite_existflags);
2365 #endif
2366
2367 /* transport_write_message() uses write() because it is called from other
2368 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2369 it can exit with "Broken pipe" as its error. This really means that the
2370 socket got closed at the far end. */
2371
2372 transport_write_timeout = 0; /* for subsequent transports */
2373
2374 /* Failure can either be some kind of I/O disaster (including timeout),
2375 or the failure of a transport filter or the expansion of added headers. */
2376
2377 if (!ok)
2378 {
2379 buffer[0] = 0; /* There hasn't been a response */
2380 goto RESPONSE_FAILED;
2381 }
2382
2383 /* We used to send the terminating "." explicitly here, but because of
2384 buffering effects at both ends of TCP/IP connections, you don't gain
2385 anything by keeping it separate, so it might as well go in the final
2386 data buffer for efficiency. This is now done by setting the topt_end_dot
2387 flag above. */
2388
2389 smtp_command = US"end of data";
2390
2391 #ifndef DISABLE_PRDR
2392 /* For PRDR we optionally get a partial-responses warning
2393 * followed by the individual responses, before going on with
2394 * the overall response. If we don't get the warning then deal
2395 * with per non-PRDR. */
2396 if(prdr_active)
2397 {
2398 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2399 ob->final_timeout);
2400 if (!ok && errno == 0)
2401 switch(buffer[0])
2402 {
2403 case '2': prdr_active = FALSE;
2404 ok = TRUE;
2405 break;
2406 case '4': errno = ERRNO_DATA4XX;
2407 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2408 break;
2409 }
2410 }
2411 else
2412 #endif
2413
2414 /* For non-PRDR SMTP, we now read a single response that applies to the
2415 whole message. If it is OK, then all the addresses have been delivered. */
2416
2417 if (!lmtp)
2418 {
2419 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2420 ob->final_timeout);
2421 if (!ok && errno == 0 && buffer[0] == '4')
2422 {
2423 errno = ERRNO_DATA4XX;
2424 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2425 }
2426 }
2427
2428 /* For LMTP, we get back a response for every RCPT command that we sent;
2429 some may be accepted and some rejected. For those that get a response, their
2430 status is fixed; any that are accepted have been handed over, even if later
2431 responses crash - at least, that's how I read RFC 2033.
2432
2433 If all went well, mark the recipient addresses as completed, record which
2434 host/IPaddress they were delivered to, and cut out RSET when sending another
2435 message down the same channel. Write the completed addresses to the journal
2436 now so that they are recorded in case there is a crash of hardware or
2437 software before the spool gets updated. Also record the final SMTP
2438 confirmation if needed (for SMTP only). */
2439
2440 if (ok)
2441 {
2442 int flag = '=';
2443 int delivery_time = (int)(time(NULL) - start_delivery_time);
2444 int len;
2445 uschar *conf = NULL;
2446 send_rset = FALSE;
2447
2448 /* Set up confirmation if needed - applies only to SMTP */
2449
2450 if (
2451 #ifndef EXPERIMENTAL_EVENT
2452 LOGGING(smtp_confirmation) &&
2453 #endif
2454 !lmtp
2455 )
2456 {
2457 const uschar *s = string_printing(buffer);
2458 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2459 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2460 }
2461
2462 /* Process all transported addresses - for LMTP or PRDR, read a status for
2463 each one. */
2464
2465 for (addr = addrlist; addr != first_addr; addr = addr->next)
2466 {
2467 if (addr->transport_return != PENDING_OK) continue;
2468
2469 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2470 remaining addresses. Otherwise, it's a return code for just the one
2471 address. For temporary errors, add a retry item for the address so that
2472 it doesn't get tried again too soon. */
2473
2474 #ifndef DISABLE_PRDR
2475 if (lmtp || prdr_active)
2476 #else
2477 if (lmtp)
2478 #endif
2479 {
2480 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2481 ob->final_timeout))
2482 {
2483 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2484 addr->message = string_sprintf(
2485 #ifndef DISABLE_PRDR
2486 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2487 #else
2488 "LMTP error after %s: %s",
2489 #endif
2490 big_buffer, string_printing(buffer));
2491 setflag(addr, af_pass_message); /* Allow message to go to user */
2492 if (buffer[0] == '5')
2493 addr->transport_return = FAIL;
2494 else
2495 {
2496 errno = ERRNO_DATA4XX;
2497 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2498 addr->transport_return = DEFER;
2499 #ifndef DISABLE_PRDR
2500 if (!prdr_active)
2501 #endif
2502 retry_add_item(addr, addr->address_retry_key, 0);
2503 }
2504 continue;
2505 }
2506 completed_address = TRUE; /* NOW we can set this flag */
2507 if (LOGGING(smtp_confirmation))
2508 {
2509 const uschar *s = string_printing(buffer);
2510 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2511 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2512 }
2513 }
2514
2515 /* SMTP, or success return from LMTP for this address. Pass back the
2516 actual host that was used. */
2517
2518 addr->transport_return = OK;
2519 addr->more_errno = delivery_time;
2520 addr->host_used = host;
2521 addr->special_action = flag;
2522 addr->message = conf;
2523 #ifndef DISABLE_PRDR
2524 if (prdr_active) addr->flags |= af_prdr_used;
2525 #endif
2526 flag = '-';
2527
2528 #ifndef DISABLE_PRDR
2529 if (!prdr_active)
2530 #endif
2531 {
2532 /* Update the journal. For homonymic addresses, use the base address plus
2533 the transport name. See lots of comments in deliver.c about the reasons
2534 for the complications when homonyms are involved. Just carry on after
2535 write error, as it may prove possible to update the spool file later. */
2536
2537 if (testflag(addr, af_homonym))
2538 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2539 else
2540 sprintf(CS buffer, "%.500s\n", addr->unique);
2541
2542 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2543 len = Ustrlen(CS buffer);
2544 if (write(journal_fd, buffer, len) != len)
2545 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2546 "%s: %s", buffer, strerror(errno));
2547 }
2548 }
2549
2550 #ifndef DISABLE_PRDR
2551 if (prdr_active)
2552 {
2553 /* PRDR - get the final, overall response. For any non-success
2554 upgrade all the address statuses. */
2555 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2556 ob->final_timeout);
2557 if (!ok)
2558 {
2559 if(errno == 0 && buffer[0] == '4')
2560 {
2561 errno = ERRNO_DATA4XX;
2562 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2563 }
2564 for (addr = addrlist; addr != first_addr; addr = addr->next)
2565 if (buffer[0] == '5' || addr->transport_return == OK)
2566 addr->transport_return = PENDING_OK; /* allow set_errno action */
2567 goto RESPONSE_FAILED;
2568 }
2569
2570 /* Update the journal, or setup retry. */
2571 for (addr = addrlist; addr != first_addr; addr = addr->next)
2572 if (addr->transport_return == OK)
2573 {
2574 if (testflag(addr, af_homonym))
2575 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2576 else
2577 sprintf(CS buffer, "%.500s\n", addr->unique);
2578
2579 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2580 len = Ustrlen(CS buffer);
2581 if (write(journal_fd, buffer, len) != len)
2582 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2583 "%s: %s", buffer, strerror(errno));
2584 }
2585 else if (addr->transport_return == DEFER)
2586 retry_add_item(addr, addr->address_retry_key, -2);
2587 }
2588 #endif
2589
2590 /* Ensure the journal file is pushed out to disk. */
2591
2592 if (EXIMfsync(journal_fd) < 0)
2593 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2594 strerror(errno));
2595 }
2596 }
2597
2598
2599 /* Handle general (not specific to one address) failures here. The value of ok
2600 is used to skip over this code on the falling through case. A timeout causes a
2601 deferral. Other errors may defer or fail according to the response code, and
2602 may set up a special errno value, e.g. after connection chopped, which is
2603 assumed if errno == 0 and there is no text in the buffer. If control reaches
2604 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2605 the problem is not related to this specific message. */
2606
2607 if (!ok)
2608 {
2609 int code, set_rc;
2610 uschar * set_message;
2611
2612 RESPONSE_FAILED:
2613 {
2614 save_errno = errno;
2615 message = NULL;
2616 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2617 buffer, &code, &message, &pass_message);
2618 goto FAILED;
2619 }
2620
2621 SEND_FAILED:
2622 {
2623 save_errno = errno;
2624 code = '4';
2625 message = US string_sprintf("send() to %s [%s] failed: %s",
2626 host->name, host->address, strerror(save_errno));
2627 send_quit = FALSE;
2628 goto FAILED;
2629 }
2630
2631 /* This label is jumped to directly when a TLS negotiation has failed,
2632 or was not done for a host for which it is required. Values will be set
2633 in message and save_errno, and setting_up will always be true. Treat as
2634 a temporary error. */
2635
2636 #ifdef SUPPORT_TLS
2637 TLS_FAILED:
2638 code = '4';
2639 #endif
2640
2641 /* If the failure happened while setting up the call, see if the failure was
2642 a 5xx response (this will either be on connection, or following HELO - a 5xx
2643 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2644 never going to accept them. For other errors during setting up (timeouts or
2645 whatever), defer all addresses, and yield DEFER, so that the host is not
2646 tried again for a while. */
2647
2648 FAILED:
2649 ok = FALSE; /* For when reached by GOTO */
2650 set_message = message;
2651
2652 if (setting_up)
2653 {
2654 if (code == '5')
2655 set_rc = FAIL;
2656 else
2657 yield = set_rc = DEFER;
2658 }
2659
2660 /* We want to handle timeouts after MAIL or "." and loss of connection after
2661 "." specially. They can indicate a problem with the sender address or with
2662 the contents of the message rather than a real error on the connection. These
2663 cases are treated in the same way as a 4xx response. This next bit of code
2664 does the classification. */
2665
2666 else
2667 {
2668 BOOL message_error;
2669
2670 switch(save_errno)
2671 {
2672 #ifdef EXPERIMENTAL_INTERNATIONAL
2673 case ERRNO_UTF8_FWD:
2674 code = '5';
2675 /*FALLTHROUGH*/
2676 #endif
2677 case 0:
2678 case ERRNO_MAIL4XX:
2679 case ERRNO_DATA4XX:
2680 message_error = TRUE;
2681 break;
2682
2683 case ETIMEDOUT:
2684 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2685 Ustrncmp(smtp_command,"end ",4) == 0;
2686 break;
2687
2688 case ERRNO_SMTPCLOSED:
2689 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2690 break;
2691
2692 default:
2693 message_error = FALSE;
2694 break;
2695 }
2696
2697 /* Handle the cases that are treated as message errors. These are:
2698
2699 (a) negative response or timeout after MAIL
2700 (b) negative response after DATA
2701 (c) negative response or timeout or dropped connection after "."
2702 (d) utf8 support required and not offered
2703
2704 It won't be a negative response or timeout after RCPT, as that is dealt
2705 with separately above. The action in all cases is to set an appropriate
2706 error code for all the addresses, but to leave yield set to OK because the
2707 host itself has not failed. Of course, it might in practice have failed
2708 when we've had a timeout, but if so, we'll discover that at the next
2709 delivery attempt. For a temporary error, set the message_defer flag, and
2710 write to the logs for information if this is not the last host. The error
2711 for the last host will be logged as part of the address's log line. */
2712
2713 if (message_error)
2714 {
2715 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2716
2717 /* If there's an errno, the message contains just the identity of
2718 the host. */
2719
2720 if (code == '5')
2721 set_rc = FAIL;
2722 else /* Anything other than 5 is treated as temporary */
2723 {
2724 set_rc = DEFER;
2725 if (save_errno > 0)
2726 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2727 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2728 msglog_line(host, message);
2729 *message_defer = TRUE;
2730 }
2731 }
2732
2733 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2734 ".", or some other transportation error. We defer all addresses and yield
2735 DEFER, except for the case of failed add_headers expansion, or a transport
2736 filter failure, when the yield should be ERROR, to stop it trying other
2737 hosts. */
2738
2739 else
2740 {
2741 set_rc = DEFER;
2742 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2743 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2744 }
2745 }
2746
2747 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2748 #ifdef EXPERIMENTAL_DSN_INFO
2749 , smtp_greeting, helo_response
2750 #endif
2751 );
2752 }
2753
2754
2755 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2756 SMTP session tidily. However, if there were too many addresses to send in one
2757 message (indicated by first_addr being non-NULL) we want to carry on with the
2758 rest of them. Also, it is desirable to send more than one message down the SMTP
2759 connection if there are several waiting, provided we haven't already sent so
2760 many as to hit the configured limit. The function transport_check_waiting looks
2761 for a waiting message and returns its id. Then transport_pass_socket tries to
2762 set up a continued delivery by passing the socket on to another process. The
2763 variable send_rset is FALSE if a message has just been successfully transfered.
2764
2765 If we are already sending down a continued channel, there may be further
2766 addresses not yet delivered that are aimed at the same host, but which have not
2767 been passed in this run of the transport. In this case, continue_more will be
2768 true, and all we should do is send RSET if necessary, and return, leaving the
2769 channel open.
2770
2771 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2772 do not want to continue with other messages down the same channel, because that
2773 can lead to looping between two or more messages, all with the same,
2774 temporarily failing address(es). [The retry information isn't updated yet, so
2775 new processes keep on trying.] We probably also don't want to try more of this
2776 message's addresses either.
2777
2778 If we have started a TLS session, we have to end it before passing the
2779 connection to a new process. However, not all servers can handle this (Exim
2780 can), so we do not pass such a connection on if the host matches
2781 hosts_nopass_tls. */
2782
2783 DEBUG(D_transport)
2784 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2785 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2786 continue_more, yield, (first_addr == NULL)? "":"not ");
2787
2788 if (completed_address && ok && send_quit)
2789 {
2790 BOOL more;
2791 smtp_compare_t t_compare;
2792
2793 t_compare.tblock = tblock;
2794 t_compare.current_sender_address = sender_address;
2795
2796 if ( first_addr != NULL
2797 || continue_more
2798 || ( ( tls_out.active < 0
2799 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2800 )
2801 &&
2802 transport_check_waiting(tblock->name, host->name,
2803 tblock->connection_max_messages, new_message_id, &more,
2804 (oicf)smtp_are_same_identities, (void*)&t_compare)
2805 ) )
2806 {
2807 uschar *msg;
2808 BOOL pass_message;
2809
2810 if (send_rset)
2811 {
2812 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2813 {
2814 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2815 host->address, strerror(save_errno));
2816 send_quit = FALSE;
2817 }
2818 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2819 ob->command_timeout)))
2820 {
2821 int code;
2822 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2823 &pass_message);
2824 if (!send_quit)
2825 {
2826 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2827 host->name, host->address, msg);
2828 }
2829 }
2830 }
2831
2832 /* Either RSET was not needed, or it succeeded */
2833
2834 if (ok)
2835 {
2836 if (first_addr != NULL) /* More addresses still to be sent */
2837 { /* in this run of the transport */
2838 continue_sequence++; /* Causes * in logging */
2839 goto SEND_MESSAGE;
2840 }
2841 if (continue_more) return yield; /* More addresses for another run */
2842
2843 /* Pass the socket to a new Exim process. Before doing so, we must shut
2844 down TLS. Not all MTAs allow for the continuation of the SMTP session
2845 when TLS is shut down. We test for this by sending a new EHLO. If we
2846 don't get a good response, we don't attempt to pass the socket on. */
2847
2848 #ifdef SUPPORT_TLS
2849 if (tls_out.active >= 0)
2850 {
2851 tls_close(FALSE, TRUE);
2852 if (smtps)
2853 ok = FALSE;
2854 else
2855 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2856 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2857 ob->command_timeout);
2858 }
2859 #endif
2860
2861 /* If the socket is successfully passed, we musn't send QUIT (or
2862 indeed anything!) from here. */
2863
2864 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2865 propagate it from the initial
2866 */
2867 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2868 new_message_id, inblock.sock))
2869 {
2870 send_quit = FALSE;
2871 }
2872 }
2873
2874 /* If RSET failed and there are addresses left, they get deferred. */
2875
2876 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2877 #ifdef EXPERIMENTAL_DSN_INFO
2878 , smtp_greeting, helo_response
2879 #endif
2880 );
2881 }
2882 }
2883
2884 /* End off tidily with QUIT unless the connection has died or the socket has
2885 been passed to another process. There has been discussion on the net about what
2886 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2887 to wait for a response, but on the other hand, there isn't anything one can do
2888 with an error response, other than log it. Exim used to do that. However,
2889 further discussion suggested that it is positively advantageous not to wait for
2890 the response, but to close the session immediately. This is supposed to move
2891 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2892 load from the server. (Hosts that are both servers and clients may not see much
2893 difference, of course.) Further discussion indicated that this was safe to do
2894 on Unix systems which have decent implementations of TCP/IP that leave the
2895 connection around for a while (TIME_WAIT) after the application has gone away.
2896 This enables the response sent by the server to be properly ACKed rather than
2897 timed out, as can happen on broken TCP/IP implementations on other OS.
2898
2899 This change is being made on 31-Jul-98. After over a year of trouble-free
2900 operation, the old commented-out code was removed on 17-Sep-99. */
2901
2902 SEND_QUIT:
2903 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2904
2905 END_OFF:
2906
2907 #ifdef SUPPORT_TLS
2908 tls_close(FALSE, TRUE);
2909 #endif
2910
2911 /* Close the socket, and return the appropriate value, first setting
2912 works because the NULL setting is passed back to the calling process, and
2913 remote_max_parallel is forced to 1 when delivering over an existing connection,
2914
2915 If all went well and continue_more is set, we shouldn't actually get here if
2916 there are further addresses, as the return above will be taken. However,
2917 writing RSET might have failed, or there may be other addresses whose hosts are
2918 specified in the transports, and therefore not visible at top level, in which
2919 case continue_more won't get set. */
2920
2921 (void)close(inblock.sock);
2922
2923 #ifdef EXPERIMENTAL_EVENT
2924 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2925 #endif
2926
2927 continue_transport = NULL;
2928 continue_hostname = NULL;
2929 return yield;
2930 }
2931
2932
2933
2934
2935 /*************************************************
2936 * Closedown entry point *
2937 *************************************************/
2938
2939 /* This function is called when exim is passed an open smtp channel
2940 from another incarnation, but the message which it has been asked
2941 to deliver no longer exists. The channel is on stdin.
2942
2943 We might do fancy things like looking for another message to send down
2944 the channel, but if the one we sought has gone, it has probably been
2945 delivered by some other process that itself will seek further messages,
2946 so just close down our connection.
2947
2948 Argument: pointer to the transport instance block
2949 Returns: nothing
2950 */
2951
2952 void
2953 smtp_transport_closedown(transport_instance *tblock)
2954 {
2955 smtp_transport_options_block *ob =
2956 (smtp_transport_options_block *)(tblock->options_block);
2957 smtp_inblock inblock;
2958 smtp_outblock outblock;
2959 uschar buffer[256];
2960 uschar inbuffer[4096];
2961 uschar outbuffer[16];
2962
2963 inblock.sock = fileno(stdin);
2964 inblock.buffer = inbuffer;
2965 inblock.buffersize = sizeof(inbuffer);
2966 inblock.ptr = inbuffer;
2967 inblock.ptrend = inbuffer;
2968
2969 outblock.sock = inblock.sock;
2970 outblock.buffersize = sizeof(outbuffer);
2971 outblock.buffer = outbuffer;
2972 outblock.ptr = outbuffer;
2973 outblock.cmd_count = 0;
2974 outblock.authenticating = FALSE;
2975
2976 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2977 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2978 ob->command_timeout);
2979 (void)close(inblock.sock);
2980 }
2981
2982
2983
2984 /*************************************************
2985 * Prepare addresses for delivery *
2986 *************************************************/
2987
2988 /* This function is called to flush out error settings from previous delivery
2989 attempts to other hosts. It also records whether we got here via an MX record
2990 or not in the more_errno field of the address. We are interested only in
2991 addresses that are still marked DEFER - others may have got delivered to a
2992 previously considered IP address. Set their status to PENDING_DEFER to indicate
2993 which ones are relevant this time.
2994
2995 Arguments:
2996 addrlist the list of addresses
2997 host the host we are delivering to
2998
2999 Returns: the first address for this delivery
3000 */
3001
3002 static address_item *
3003 prepare_addresses(address_item *addrlist, host_item *host)
3004 {
3005 address_item *first_addr = NULL;
3006 address_item *addr;
3007 for (addr = addrlist; addr != NULL; addr = addr->next)
3008 if (addr->transport_return == DEFER)
3009 {
3010 if (first_addr == NULL) first_addr = addr;
3011 addr->transport_return = PENDING_DEFER;
3012 addr->basic_errno = 0;
3013 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3014 addr->message = NULL;
3015 #ifdef SUPPORT_TLS
3016 addr->cipher = NULL;
3017 addr->ourcert = NULL;
3018 addr->peercert = NULL;
3019 addr->peerdn = NULL;
3020 addr->ocsp = OCSP_NOT_REQ;
3021 #endif
3022 #ifdef EXPERIMENTAL_DSN_INFO
3023 addr->smtp_greeting = NULL;
3024 addr->helo_response = NULL;
3025 #endif
3026 }
3027 return first_addr;
3028 }
3029
3030
3031
3032 /*************************************************
3033 * Main entry point *
3034 *************************************************/
3035
3036 /* See local README for interface details. As this is a remote transport, it is
3037 given a chain of addresses to be delivered in one connection, if possible. It
3038 always returns TRUE, indicating that each address has its own independent
3039 status set, except if there is a setting up problem, in which case it returns
3040 FALSE. */
3041
3042 BOOL
3043 smtp_transport_entry(
3044 transport_instance *tblock, /* data for this instantiation */
3045 address_item *addrlist) /* addresses we are working on */
3046 {
3047 int cutoff_retry;
3048 int port;
3049 int hosts_defer = 0;
3050 int hosts_fail = 0;
3051 int hosts_looked_up = 0;
3052 int hosts_retry = 0;
3053 int hosts_serial = 0;
3054 int hosts_total = 0;
3055 int total_hosts_tried = 0;
3056 address_item *addr;
3057 BOOL expired = TRUE;
3058 BOOL continuing = continue_hostname != NULL;
3059 uschar *expanded_hosts = NULL;
3060 uschar *pistring;
3061 uschar *tid = string_sprintf("%s transport", tblock->name);
3062 smtp_transport_options_block *ob =
3063 (smtp_transport_options_block *)(tblock->options_block);
3064 host_item *hostlist = addrlist->host_list;
3065 host_item *host = NULL;
3066
3067 DEBUG(D_transport)
3068 {
3069 debug_printf("%s transport entered\n", tblock->name);
3070 for (addr = addrlist; addr != NULL; addr = addr->next)
3071 debug_printf(" %s\n", addr->address);
3072 if (continuing) debug_printf("already connected to %s [%s]\n",
3073 continue_hostname, continue_host_address);
3074 }
3075
3076 /* Set the flag requesting that these hosts be added to the waiting
3077 database if the delivery fails temporarily or if we are running with
3078 queue_smtp or a 2-stage queue run. This gets unset for certain
3079 kinds of error, typically those that are specific to the message. */
3080
3081 update_waiting = TRUE;
3082
3083 /* If a host list is not defined for the addresses - they must all have the
3084 same one in order to be passed to a single transport - or if the transport has
3085 a host list with hosts_override set, use the host list supplied with the
3086 transport. It is an error for this not to exist. */
3087
3088 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3089 {
3090 if (ob->hosts == NULL)
3091 {
3092 addrlist->message = string_sprintf("%s transport called with no hosts set",
3093 tblock->name);
3094 addrlist->transport_return = PANIC;
3095 return FALSE; /* Only top address has status */
3096 }
3097
3098 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3099 ob->hosts);
3100
3101 /* If the transport's host list contains no '$' characters, and we are not
3102 randomizing, it is fixed and therefore a chain of hosts can be built once
3103 and for all, and remembered for subsequent use by other calls to this
3104 transport. If, on the other hand, the host list does contain '$', or we are
3105 randomizing its order, we have to rebuild it each time. In the fixed case,
3106 as the hosts string will never be used again, it doesn't matter that we
3107 replace all the : characters with zeros. */
3108
3109 if (ob->hostlist == NULL)
3110 {
3111 uschar *s = ob->hosts;
3112
3113 if (Ustrchr(s, '$') != NULL)
3114 {
3115 if (!(expanded_hosts = expand_string(s)))
3116 {
3117 addrlist->message = string_sprintf("failed to expand list of hosts "
3118 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3119 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3120 return FALSE; /* Only top address has status */
3121 }
3122 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3123 "\"%s\"\n", s, expanded_hosts);
3124 s = expanded_hosts;
3125 }
3126 else
3127 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3128
3129 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3130
3131 /* Check that the expansion yielded something useful. */
3132 if (hostlist == NULL)
3133 {
3134 addrlist->message =
3135 string_sprintf("%s transport has empty hosts setting", tblock->name);
3136 addrlist->transport_return = PANIC;
3137 return FALSE; /* Only top address has status */
3138 }
3139
3140 /* If there was no expansion of hosts, save the host list for
3141 next time. */
3142
3143 if (!expanded_hosts) ob->hostlist = hostlist;
3144 }
3145
3146 /* This is not the first time this transport has been run in this delivery;
3147 the host list was built previously. */
3148
3149 else
3150 hostlist = ob->hostlist;
3151 }
3152
3153 /* The host list was supplied with the address. If hosts_randomize is set, we
3154 must sort it into a random order if it did not come from MX records and has not
3155 already been randomized (but don't bother if continuing down an existing
3156 connection). */
3157
3158 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3159 {
3160 host_item *newlist = NULL;
3161 while (hostlist != NULL)
3162 {
3163 host_item *h = hostlist;
3164 hostlist = hostlist->next;
3165
3166 h->sort_key = random_number(100);
3167
3168 if (newlist == NULL)
3169 {
3170 h->next = NULL;
3171 newlist = h;
3172 }
3173 else if (h->sort_key < newlist->sort_key)
3174 {
3175 h->next = newlist;
3176 newlist = h;
3177 }
3178 else
3179 {
3180 host_item *hh = newlist;
3181 while (hh->next != NULL)
3182 {
3183 if (h->sort_key < hh->next->sort_key) break;
3184 hh = hh->next;
3185 }
3186 h->next = hh->next;
3187 hh->next = h;
3188 }
3189 }
3190
3191 hostlist = addrlist->host_list = newlist;
3192 }
3193
3194 /* Sort out the default port. */
3195
3196 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3197
3198 /* For each host-plus-IP-address on the list:
3199
3200 . If this is a continued delivery and the host isn't the one with the
3201 current connection, skip.
3202
3203 . If the status is unusable (i.e. previously failed or retry checked), skip.
3204
3205 . If no IP address set, get the address, either by turning the name into
3206 an address, calling gethostbyname if gethostbyname is on, or by calling
3207 the DNS. The DNS may yield multiple addresses, in which case insert the
3208 extra ones into the list.
3209
3210 . Get the retry data if not previously obtained for this address and set the
3211 field which remembers the state of this address. Skip if the retry time is
3212 not reached. If not, remember whether retry data was found. The retry string
3213 contains both the name and the IP address.
3214
3215 . Scan the list of addresses and mark those whose status is DEFER as
3216 PENDING_DEFER. These are the only ones that will be processed in this cycle
3217 of the hosts loop.
3218
3219 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3220 Some addresses may be successfully delivered, others may fail, and yet
3221 others may get temporary errors and so get marked DEFER.
3222
3223 . The return from the delivery attempt is OK if a connection was made and a
3224 valid SMTP dialogue was completed. Otherwise it is DEFER.
3225
3226 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3227
3228 . If fail to connect, or other defer state, add a retry item.
3229
3230 . If there are any addresses whose status is still DEFER, carry on to the
3231 next host/IPaddress, unless we have tried the number of hosts given
3232 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3233 there is some fancy logic for hosts_max_try that means its limit can be
3234 overstepped in some circumstances.
3235
3236 If we get to the end of the list, all hosts have deferred at least one address,
3237 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3238 delivery attempt to those hosts whose last try was before the arrival time of
3239 the current message. To cope with this, we have to go round the loop a second
3240 time. After that, set the status and error data for any addresses that haven't
3241 had it set already. */
3242
3243 for (cutoff_retry = 0; expired &&
3244 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3245 cutoff_retry++)
3246 {
3247 host_item *nexthost = NULL;
3248 int unexpired_hosts_tried = 0;
3249
3250 for (host = hostlist;
3251 host != NULL &&
3252 unexpired_hosts_tried < ob->hosts_max_try &&
3253 total_hosts_tried < ob->hosts_max_try_hardlimit;
3254 host = nexthost)
3255 {
3256 int rc;
3257 int host_af;
3258 uschar *rs;
3259 BOOL serialized = FALSE;
3260 BOOL host_is_expired = FALSE;
3261 BOOL message_defer = FALSE;
3262 BOOL some_deferred = FALSE;
3263 address_item *first_addr = NULL;
3264 uschar *interface = NULL;
3265 uschar *retry_host_key = NULL;
3266 uschar *retry_message_key = NULL;
3267 uschar *serialize_key = NULL;
3268
3269 /* Default next host is next host. :-) But this can vary if the
3270 hosts_max_try limit is hit (see below). It may also be reset if a host
3271 address is looked up here (in case the host was multihomed). */
3272
3273 nexthost = host->next;
3274
3275 /* If the address hasn't yet been obtained from the host name, look it up
3276 now, unless the host is already marked as unusable. If it is marked as
3277 unusable, it means that the router was unable to find its IP address (in
3278 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3279 the lookup failed last time. We don't get this far if *all* MX records
3280 point to non-existent hosts; that is treated as a hard error.
3281
3282 We can just skip this host entirely. When the hosts came from the router,
3283 the address will timeout based on the other host(s); when the address is
3284 looked up below, there is an explicit retry record added.
3285
3286 Note that we mustn't skip unusable hosts if the address is not unset; they
3287 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3288
3289 if (host->address == NULL)
3290 {
3291 int new_port, flags;
3292 host_item *hh;
3293
3294 if (host->status >= hstatus_unusable)
3295 {
3296 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3297 host->name);
3298 continue;
3299 }
3300
3301 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3302
3303 /* The host name is permitted to have an attached port. Find it, and
3304 strip it from the name. Just remember it for now. */
3305
3306 new_port = host_item_get_port(host);
3307
3308 /* Count hosts looked up */
3309
3310 hosts_looked_up++;
3311
3312 /* Find by name if so configured, or if it's an IP address. We don't
3313 just copy the IP address, because we need the test-for-local to happen. */
3314
3315 flags = HOST_FIND_BY_A;
3316 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3317 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3318
3319 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3320 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3321 else
3322 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3323 &ob->dnssec, /* domains for request/require */
3324 NULL, NULL);
3325
3326 /* Update the host (and any additional blocks, resulting from
3327 multihoming) with a host-specific port, if any. */
3328
3329 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3330
3331 /* Failure to find the host at this time (usually DNS temporary failure)
3332 is really a kind of routing failure rather than a transport failure.
3333 Therefore we add a retry item of the routing kind, not to stop us trying
3334 to look this name up here again, but to ensure the address gets timed
3335 out if the failures go on long enough. A complete failure at this point
3336 commonly points to a configuration error, but the best action is still
3337 to carry on for the next host. */
3338