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Testsuite: make debug output for proxied TLS less indeterminate
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_hash", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
48 { "dkim_identity", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.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 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
83 #ifdef SUPPORT_TLS
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
86 #endif
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
91 #ifdef SUPPORT_TLS
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 { "hosts_noproxy_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
129 #ifndef DISABLE_PRDR
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 #endif
133 #ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136 #endif
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
157 #ifdef SUPPORT_SOCKS
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 #endif
161 #ifdef SUPPORT_TLS
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
184 #endif
185 };
186
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
189
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
193
194 #ifdef MACRO_PREDEF
195
196 /* Dummy values */
197 smtp_transport_options_block smtp_transport_option_defaults = {0};
198 void smtp_transport_init(transport_instance *tblock) {}
199 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
200 void smtp_transport_closedown(transport_instance *tblock) {}
201
202 #else /*!MACRO_PREDEF*/
203
204
205 /* Default private options block for the smtp transport. */
206
207 smtp_transport_options_block smtp_transport_option_defaults = {
208 .hosts = NULL,
209 .hosts = NULL,
210 .hostlist = NULL,
211 .fallback_hostlist = NULL,
212 .authenticated_sender = NULL,
213 .helo_data = US"$primary_hostname",
214 .interface = NULL,
215 .port = NULL,
216 .protocol = US"smtp",
217 .dscp = NULL,
218 .serialize_hosts = NULL,
219 .hosts_try_auth = NULL,
220 .hosts_require_auth = NULL,
221 .hosts_try_chunking = US"*",
222 #ifdef EXPERIMENTAL_DANE
223 .hosts_try_dane = NULL,
224 .hosts_require_dane = NULL,
225 #endif
226 .hosts_try_fastopen = NULL,
227 #ifndef DISABLE_PRDR
228 .hosts_try_prdr = US"*",
229 #endif
230 #ifndef DISABLE_OCSP
231 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
232 .hosts_require_ocsp = NULL,
233 #endif
234 .hosts_require_tls = NULL,
235 .hosts_avoid_tls = NULL,
236 .hosts_verify_avoid_tls = NULL,
237 .hosts_avoid_pipelining = NULL,
238 .hosts_avoid_esmtp = NULL,
239 #ifdef SUPPORT_TLS
240 .hosts_nopass_tls = NULL,
241 .hosts_noproxy_tls = US"*",
242 #endif
243 .command_timeout = 5*60,
244 .connect_timeout = 5*60,
245 .data_timeout = 5*60,
246 .final_timeout = 10*60,
247 .size_addition = 1024,
248 .hosts_max_try = 5,
249 .hosts_max_try_hardlimit = 50,
250 .address_retry_include_sender = TRUE,
251 .allow_localhost = FALSE,
252 .authenticated_sender_force = FALSE,
253 .gethostbyname = FALSE,
254 .dns_qualify_single = TRUE,
255 .dns_search_parents = FALSE,
256 .dnssec = { .request=NULL, .require=NULL },
257 .delay_after_cutoff = TRUE,
258 .hosts_override = FALSE,
259 .hosts_randomize = FALSE,
260 .keepalive = TRUE,
261 .lmtp_ignore_quota = FALSE,
262 .expand_retry_include_ip_address = NULL,
263 .retry_include_ip_address = TRUE,
264 #ifdef SUPPORT_SOCKS
265 .socks_proxy = NULL,
266 #endif
267 #ifdef SUPPORT_TLS
268 .tls_certificate = NULL,
269 .tls_crl = NULL,
270 .tls_privatekey = NULL,
271 .tls_require_ciphers = NULL,
272 .tls_sni = NULL,
273 .tls_verify_certificates = US"system",
274 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
275 .tls_tempfail_tryclear = TRUE,
276 .tls_verify_hosts = NULL,
277 .tls_try_verify_hosts = US"*",
278 .tls_verify_cert_hostnames = US"*",
279 #endif
280 #ifndef DISABLE_DKIM
281 .dkim =
282 {.dkim_domain = NULL,
283 .dkim_identity = NULL,
284 .dkim_private_key = NULL,
285 .dkim_selector = NULL,
286 .dkim_canon = NULL,
287 .dkim_sign_headers = NULL,
288 .dkim_strict = NULL,
289 .dkim_hash = US"sha256",
290 .dot_stuffed = FALSE},
291 #endif
292 };
293
294 /* some DSN flags for use later */
295
296 static int rf_list[] = {rf_notify_never, rf_notify_success,
297 rf_notify_failure, rf_notify_delay };
298
299 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
300
301
302
303 /* Local statics */
304
305 static uschar *smtp_command; /* Points to last cmd for error messages */
306 static uschar *mail_command; /* Points to MAIL cmd for error messages */
307 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
308 static BOOL update_waiting; /* TRUE to update the "wait" database */
309
310 /*XXX move to smtp_context */
311 static BOOL pipelining_active; /* current transaction is in pipe mode */
312
313
314 /*************************************************
315 * Setup entry point *
316 *************************************************/
317
318 /* This function is called when the transport is about to be used,
319 but before running it in a sub-process. It is used for two things:
320
321 (1) To set the fallback host list in addresses, when delivering.
322 (2) To pass back the interface, port, protocol, and other options, for use
323 during callout verification.
324
325 Arguments:
326 tblock pointer to the transport instance block
327 addrlist list of addresses about to be transported
328 tf if not NULL, pointer to block in which to return options
329 uid the uid that will be set (not used)
330 gid the gid that will be set (not used)
331 errmsg place for error message (not used)
332
333 Returns: OK always (FAIL, DEFER not used)
334 */
335
336 static int
337 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
338 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
339 {
340 smtp_transport_options_block *ob =
341 (smtp_transport_options_block *)(tblock->options_block);
342
343 errmsg = errmsg; /* Keep picky compilers happy */
344 uid = uid;
345 gid = gid;
346
347 /* Pass back options if required. This interface is getting very messy. */
348
349 if (tf)
350 {
351 tf->interface = ob->interface;
352 tf->port = ob->port;
353 tf->protocol = ob->protocol;
354 tf->hosts = ob->hosts;
355 tf->hosts_override = ob->hosts_override;
356 tf->hosts_randomize = ob->hosts_randomize;
357 tf->gethostbyname = ob->gethostbyname;
358 tf->qualify_single = ob->dns_qualify_single;
359 tf->search_parents = ob->dns_search_parents;
360 tf->helo_data = ob->helo_data;
361 }
362
363 /* Set the fallback host list for all the addresses that don't have fallback
364 host lists, provided that the local host wasn't present in the original host
365 list. */
366
367 if (!testflag(addrlist, af_local_host_removed))
368 for (; addrlist; addrlist = addrlist->next)
369 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
370
371 return OK;
372 }
373
374
375
376 /*************************************************
377 * Initialization entry point *
378 *************************************************/
379
380 /* Called for each instance, after its options have been read, to
381 enable consistency checks to be done, or anything else that needs
382 to be set up.
383
384 Argument: pointer to the transport instance block
385 Returns: nothing
386 */
387
388 void
389 smtp_transport_init(transport_instance *tblock)
390 {
391 smtp_transport_options_block *ob =
392 (smtp_transport_options_block *)(tblock->options_block);
393
394 /* Retry_use_local_part defaults FALSE if unset */
395
396 if (tblock->retry_use_local_part == TRUE_UNSET)
397 tblock->retry_use_local_part = FALSE;
398
399 /* Set the default port according to the protocol */
400
401 if (ob->port == NULL)
402 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
403 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
404
405 /* Set up the setup entry point, to be called before subprocesses for this
406 transport. */
407
408 tblock->setup = smtp_transport_setup;
409
410 /* Complain if any of the timeouts are zero. */
411
412 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
413 ob->final_timeout <= 0)
414 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
415 "command, data, or final timeout value is zero for %s transport",
416 tblock->name);
417
418 /* If hosts_override is set and there are local hosts, set the global
419 flag that stops verify from showing router hosts. */
420
421 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
422
423 /* If there are any fallback hosts listed, build a chain of host items
424 for them, but do not do any lookups at this time. */
425
426 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
427 }
428
429
430
431
432
433 /*************************************************
434 * Set delivery info into all active addresses *
435 *************************************************/
436
437 /* Only addresses whose status is >= PENDING are relevant. A lesser
438 status means that an address is not currently being processed.
439
440 Arguments:
441 addrlist points to a chain of addresses
442 errno_value to put in each address's errno field
443 msg to put in each address's message field
444 rc to put in each address's transport_return field
445 pass_message if TRUE, set the "pass message" flag in the address
446 host if set, mark addrs as having used this host
447 smtp_greeting from peer
448 helo_response from peer
449
450 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
451 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
452 this particular type of timeout.
453
454 Returns: nothing
455 */
456
457 static void
458 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
459 BOOL pass_message, host_item * host
460 #ifdef EXPERIMENTAL_DSN_INFO
461 , const uschar * smtp_greeting, const uschar * helo_response
462 #endif
463 )
464 {
465 address_item *addr;
466 int orvalue = 0;
467 if (errno_value == ERRNO_CONNECTTIMEOUT)
468 {
469 errno_value = ETIMEDOUT;
470 orvalue = RTEF_CTOUT;
471 }
472 for (addr = addrlist; addr; addr = addr->next)
473 if (addr->transport_return >= PENDING)
474 {
475 addr->basic_errno = errno_value;
476 addr->more_errno |= orvalue;
477 if (msg)
478 {
479 addr->message = msg;
480 if (pass_message) setflag(addr, af_pass_message);
481 }
482 addr->transport_return = rc;
483 if (host)
484 {
485 addr->host_used = host;
486 #ifdef EXPERIMENTAL_DSN_INFO
487 if (smtp_greeting)
488 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
489 addr->smtp_greeting = smtp_greeting;
490
491 if (helo_response)
492 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
493 addr->helo_response = helo_response;
494 #endif
495 }
496 }
497 }
498
499 static void
500 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message)
502 {
503 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
504 #ifdef EXPERIMENTAL_DSN_INFO
505 , NULL, NULL
506 #endif
507 );
508 }
509
510
511 /*************************************************
512 * Check an SMTP response *
513 *************************************************/
514
515 /* This function is given an errno code and the SMTP response buffer
516 to analyse, together with the host identification for generating messages. It
517 sets an appropriate message and puts the first digit of the response code into
518 the yield variable. If no response was actually read, a suitable digit is
519 chosen.
520
521 Arguments:
522 host the current host, to get its name for messages
523 errno_value pointer to the errno value
524 more_errno from the top address for use with ERRNO_FILTER_FAIL
525 buffer the SMTP response buffer
526 yield where to put a one-digit SMTP response code
527 message where to put an error message
528 pass_message set TRUE if message is an SMTP response
529
530 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
531 */
532
533 static BOOL
534 check_response(host_item *host, int *errno_value, int more_errno,
535 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
536 {
537 uschar * pl = pipelining_active ? US"pipelined " : US"";
538 const uschar * s;
539
540 *yield = '4'; /* Default setting is to give a temporary error */
541
542 switch(*errno_value)
543 {
544 case ETIMEDOUT: /* Handle response timeout */
545 *message = US string_sprintf("SMTP timeout after %s%s",
546 pl, smtp_command);
547 if (transport_count > 0)
548 *message = US string_sprintf("%s (%d bytes written)", *message,
549 transport_count);
550 return FALSE;
551
552 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
553 s = string_printing(buffer);
554 while (isspace(*s)) s++;
555 *message = *s == 0
556 ? string_sprintf("Malformed SMTP reply (an empty line) "
557 "in response to %s%s", pl, smtp_command)
558 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
559 pl, smtp_command, s);
560 return FALSE;
561
562 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
563 can't send QUIT as we mustn't end the DATA. */
564 *message = string_sprintf("transport filter process failed (%d)%s",
565 more_errno,
566 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
567 return FALSE;
568
569 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
570 can't send QUIT as we mustn't end the DATA. */
571 *message =
572 string_sprintf("failed to expand headers_add or headers_remove: %s",
573 expand_string_message);
574 return FALSE;
575
576 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
577 *message = string_sprintf("failed to write a data block");
578 return FALSE;
579
580 #ifdef SUPPORT_I18N
581 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
582 *message = US"utf8 support required but not offered for forwarding";
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
584 return TRUE;
585 #endif
586 }
587
588 /* Handle error responses from the remote mailer. */
589
590 if (buffer[0] != 0)
591 {
592 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s = string_printing(buffer));
594 *pass_message = TRUE;
595 *yield = buffer[0];
596 return TRUE;
597 }
598
599 /* No data was read. If there is no errno, this must be the EOF (i.e.
600 connection closed) case, which causes deferral. An explicit connection reset
601 error has the same effect. Otherwise, put the host's identity in the message,
602 leaving the errno value to be interpreted as well. In all cases, we have to
603 assume the connection is now dead. */
604
605 if (*errno_value == 0 || *errno_value == ECONNRESET)
606 {
607 *errno_value = ERRNO_SMTPCLOSED;
608 *message = US string_sprintf("Remote host closed connection "
609 "in response to %s%s", pl, smtp_command);
610 }
611 else
612 *message = US string_sprintf("%s [%s]", host->name, host->address);
613
614 return FALSE;
615 }
616
617
618
619 /*************************************************
620 * Write error message to logs *
621 *************************************************/
622
623 /* This writes to the main log and to the message log.
624
625 Arguments:
626 addr the address item containing error information
627 host the current host
628
629 Returns: nothing
630 */
631
632 static void
633 write_logs(address_item *addr, host_item *host)
634 {
635 uschar * message = LOGGING(outgoing_port)
636 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
637 host->port == PORT_NONE ? 25 : host->port)
638 : string_sprintf("H=%s [%s]", host->name, host->address);
639
640 if (addr->message)
641 {
642 message = string_sprintf("%s: %s", message, addr->message);
643 if (addr->basic_errno > 0)
644 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
645 log_write(0, LOG_MAIN, "%s", message);
646 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
647 }
648 else
649 {
650 const uschar * s = exim_errstr(addr->basic_errno);
651 log_write(0, LOG_MAIN, "%s %s", message, s);
652 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
653 }
654 }
655
656 static void
657 msglog_line(host_item * host, uschar * message)
658 {
659 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
661 }
662
663
664
665 #ifndef DISABLE_EVENT
666 /*************************************************
667 * Post-defer action *
668 *************************************************/
669
670 /* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
672
673 Arguments:
674 addr the address item containing error information
675 host the current host
676
677 Returns: nothing
678 */
679
680 static void
681 deferred_event_raise(address_item *addr, host_item *host)
682 {
683 uschar * action = addr->transport->event_action;
684 const uschar * save_domain;
685 uschar * save_local;
686
687 if (!action)
688 return;
689
690 save_domain = deliver_domain;
691 save_local = deliver_localpart;
692
693 /*XXX would ip & port already be set up? */
694 deliver_host_address = string_copy(host->address);
695 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696 event_defer_errno = addr->basic_errno;
697
698 router_name = addr->router->name;
699 transport_name = addr->transport->name;
700 deliver_domain = addr->domain;
701 deliver_localpart = addr->local_part;
702
703 (void) event_raise(action, US"msg:host:defer",
704 addr->message
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
710 : NULL);
711
712 deliver_localpart = save_local;
713 deliver_domain = save_domain;
714 router_name = transport_name = NULL;
715 }
716 #endif
717
718 /*************************************************
719 * Synchronize SMTP responses *
720 *************************************************/
721
722 /* This function is called from smtp_deliver() to receive SMTP responses from
723 the server, and match them up with the commands to which they relate. When
724 PIPELINING is not in use, this function is called after every command, and is
725 therefore somewhat over-engineered, but it is simpler to use a single scheme
726 that works both with and without PIPELINING instead of having two separate sets
727 of code.
728
729 The set of commands that are buffered up with pipelining may start with MAIL
730 and may end with DATA; in between are RCPT commands that correspond to the
731 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732 etc.) are never buffered.
733
734 Errors after MAIL or DATA abort the whole process leaving the response in the
735 buffer. After MAIL, pending responses are flushed, and the original command is
736 re-instated in big_buffer for error messages. For RCPT commands, the remote is
737 permitted to reject some recipient addresses while accepting others. However
738 certain errors clearly abort the whole process. Set the value in
739 transport_return to PENDING_OK if the address is accepted. If there is a
740 subsequent general error, it will get reset accordingly. If not, it will get
741 converted to OK at the end.
742
743 Arguments:
744 sx smtp connection context
745 count the number of responses to read
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749
750 Returns: 3 if at least one address had 2xx and one had 5xx
751 2 if at least one address had 5xx but none had 2xx
752 1 if at least one host had a 2xx response, but none had 5xx
753 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
754 -1 timeout while reading RCPT response
755 -2 I/O or other non-response error for RCPT
756 -3 DATA or MAIL failed - errno and buffer set
757 */
758
759 static int
760 sync_responses(smtp_context * sx, int count, int pending_DATA)
761 {
762 address_item *addr = sx->sync_addr;
763 smtp_transport_options_block *ob =
764 (smtp_transport_options_block *)sx->tblock->options_block;
765 int yield = 0;
766
767 /* Handle the response for a MAIL command. On error, reinstate the original
768 command in big_buffer for error message use, and flush any further pending
769 responses before returning, except after I/O errors and timeouts. */
770
771 if (sx->pending_MAIL)
772 {
773 count--;
774 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
775 '2', ob->command_timeout))
776 {
777 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
778 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
779 if (errno == 0 && sx->buffer[0] != 0)
780 {
781 uschar flushbuffer[4096];
782 int save_errno = 0;
783 if (sx->buffer[0] == '4')
784 {
785 save_errno = ERRNO_MAIL4XX;
786 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
787 }
788 while (count-- > 0)
789 {
790 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
791 '2', ob->command_timeout)
792 && (errno != 0 || flushbuffer[0] == 0))
793 break;
794 }
795 errno = save_errno;
796 }
797
798 if (pending_DATA) count--; /* Number of RCPT responses to come */
799 while (count-- > 0) /* Mark any pending addrs with the host used */
800 {
801 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
802 addr->host_used = sx->host;
803 addr = addr->next;
804 }
805 return -3;
806 }
807 }
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810
811 /* Read and handle the required number of RCPT responses, matching each one up
812 with an address by scanning for the next address whose status is PENDING_DEFER.
813 */
814
815 while (count-- > 0)
816 {
817 while (addr->transport_return != PENDING_DEFER)
818 if (!(addr = addr->next))
819 return -2;
820
821 /* The address was accepted */
822 addr->host_used = sx->host;
823
824 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
825 '2', ob->command_timeout))
826 {
827 yield |= 1;
828 addr->transport_return = PENDING_OK;
829
830 /* If af_dr_retry_exists is set, there was a routing delay on this address;
831 ensure that any address-specific retry record is expunged. We do this both
832 for the basic key and for the version that also includes the sender. */
833
834 if (testflag(addr, af_dr_retry_exists))
835 {
836 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
837 sender_address);
838 retry_add_item(addr, altkey, rf_delete);
839 retry_add_item(addr, addr->address_retry_key, rf_delete);
840 }
841 }
842
843 /* Timeout while reading the response */
844
845 else if (errno == ETIMEDOUT)
846 {
847 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
848 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
849 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
850 retry_add_item(addr, addr->address_retry_key, 0);
851 update_waiting = FALSE;
852 return -1;
853 }
854
855 /* Handle other errors in obtaining an SMTP response by returning -1. This
856 will cause all the addresses to be deferred. Restore the SMTP command in
857 big_buffer for which we are checking the response, so the error message
858 makes sense. */
859
860 else if (errno != 0 || sx->buffer[0] == 0)
861 {
862 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
863 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
864 return -2;
865 }
866
867 /* Handle SMTP permanent and temporary response codes. */
868
869 else
870 {
871 addr->message =
872 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
873 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
874 string_printing(sx->buffer));
875 setflag(addr, af_pass_message);
876 if (!sx->verify)
877 msglog_line(sx->host, addr->message);
878
879 /* The response was 5xx */
880
881 if (sx->buffer[0] == '5')
882 {
883 addr->transport_return = FAIL;
884 yield |= 2;
885 }
886
887 /* The response was 4xx */
888
889 else
890 {
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
893 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
894
895 if (!sx->verify)
896 {
897 #ifndef DISABLE_EVENT
898 event_defer_errno = addr->more_errno;
899 msg_event_raise(US"msg:rcpt:host:defer", addr);
900 #endif
901
902 /* Log temporary errors if there are more hosts to be tried.
903 If not, log this last one in the == line. */
904
905 if (sx->host->next)
906 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
907 sx->host->name, sx->host->address, addr->message);
908
909 #ifndef DISABLE_EVENT
910 else
911 msg_event_raise(US"msg:rcpt:defer", addr);
912 #endif
913
914 /* Do not put this message on the list of those waiting for specific
915 hosts, as otherwise it is likely to be tried too often. */
916
917 update_waiting = FALSE;
918
919 /* Add a retry item for the address so that it doesn't get tried again
920 too soon. If address_retry_include_sender is true, add the sender address
921 to the retry key. */
922
923 retry_add_item(addr,
924 ob->address_retry_include_sender
925 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
926 : addr->address_retry_key,
927 0);
928 }
929 }
930 }
931 } /* Loop for next RCPT response */
932
933 /* Update where to start at for the next block of responses, unless we
934 have already handled all the addresses. */
935
936 if (addr) sx->sync_addr = addr->next;
937
938 /* Handle a response to DATA. If we have not had any good recipients, either
939 previously or in this block, the response is ignored. */
940
941 if (pending_DATA != 0 &&
942 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
943 '3', ob->command_timeout))
944 {
945 int code;
946 uschar *msg;
947 BOOL pass_message;
948 if (pending_DATA > 0 || (yield & 1) != 0)
949 {
950 if (errno == 0 && sx->buffer[0] == '4')
951 {
952 errno = ERRNO_DATA4XX;
953 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
954 }
955 return -3;
956 }
957 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
958 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
959 "is in use and there were no good recipients\n", msg);
960 }
961
962 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
963 present) received 3xx. If any RCPTs were handled and yielded anything other
964 than 4xx, yield will be set non-zero. */
965
966 return yield;
967 }
968
969
970
971 /* Do the client side of smtp-level authentication */
972 /*
973 Arguments:
974 buffer EHLO response from server (gets overwritten)
975 addrlist chain of potential addresses to deliver
976 host host to deliver to
977 ob transport options
978 ibp, obp comms channel control blocks
979
980 Returns:
981 OK Success, or failed (but not required): global "smtp_authenticated" set
982 DEFER Failed authentication (and was required)
983 ERROR Internal problem
984
985 FAIL_SEND Failed communications - transmit
986 FAIL - response
987 */
988
989 int
990 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
991 smtp_transport_options_block *ob, BOOL is_esmtp,
992 smtp_inblock *ibp, smtp_outblock *obp)
993 {
994 int require_auth;
995 uschar *fail_reason = US"server did not advertise AUTH support";
996
997 smtp_authenticated = FALSE;
998 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
999 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1000
1001 if (is_esmtp && !regex_AUTH) regex_AUTH =
1002 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1003 FALSE, TRUE);
1004
1005 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1006 {
1007 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1008 expand_nmax = -1; /* reset */
1009
1010 /* Must not do this check until after we have saved the result of the
1011 regex match above. */
1012
1013 if (require_auth == OK ||
1014 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1015 {
1016 auth_instance *au;
1017 fail_reason = US"no common mechanisms were found";
1018
1019 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1020
1021 /* Scan the configured authenticators looking for one which is configured
1022 for use as a client, which is not suppressed by client_condition, and
1023 whose name matches an authentication mechanism supported by the server.
1024 If one is found, attempt to authenticate by calling its client function.
1025 */
1026
1027 for (au = auths; !smtp_authenticated && au; au = au->next)
1028 {
1029 uschar *p = names;
1030 if (!au->client ||
1031 (au->client_condition != NULL &&
1032 !expand_check_condition(au->client_condition, au->name,
1033 US"client authenticator")))
1034 {
1035 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1036 au->name,
1037 (au->client)? "client_condition is false" :
1038 "not configured as a client");
1039 continue;
1040 }
1041
1042 /* Loop to scan supported server mechanisms */
1043
1044 while (*p)
1045 {
1046 int rc;
1047 int len = Ustrlen(au->public_name);
1048 while (isspace(*p)) p++;
1049
1050 if (strncmpic(au->public_name, p, len) != 0 ||
1051 (p[len] != 0 && !isspace(p[len])))
1052 {
1053 while (*p != 0 && !isspace(*p)) p++;
1054 continue;
1055 }
1056
1057 /* Found data for a listed mechanism. Call its client entry. Set
1058 a flag in the outblock so that data is overwritten after sending so
1059 that reflections don't show it. */
1060
1061 fail_reason = US"authentication attempt(s) failed";
1062 obp->authenticating = TRUE;
1063 rc = (au->info->clientcode)(au, ibp, obp,
1064 ob->command_timeout, buffer, bufsize);
1065 obp->authenticating = FALSE;
1066 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1067 au->name, rc);
1068
1069 /* A temporary authentication failure must hold up delivery to
1070 this host. After a permanent authentication failure, we carry on
1071 to try other authentication methods. If all fail hard, try to
1072 deliver the message unauthenticated unless require_auth was set. */
1073
1074 switch(rc)
1075 {
1076 case OK:
1077 smtp_authenticated = TRUE; /* stops the outer loop */
1078 client_authenticator = au->name;
1079 if (au->set_client_id != NULL)
1080 client_authenticated_id = expand_string(au->set_client_id);
1081 break;
1082
1083 /* Failure after writing a command */
1084
1085 case FAIL_SEND:
1086 return FAIL_SEND;
1087
1088 /* Failure after reading a response */
1089
1090 case FAIL:
1091 if (errno != 0 || buffer[0] != '5') return FAIL;
1092 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1093 au->name, host->name, host->address, buffer);
1094 break;
1095
1096 /* Failure by some other means. In effect, the authenticator
1097 decided it wasn't prepared to handle this case. Typically this
1098 is the result of "fail" in an expansion string. Do we need to
1099 log anything here? Feb 2006: a message is now put in the buffer
1100 if logging is required. */
1101
1102 case CANCELLED:
1103 if (*buffer != 0)
1104 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1105 "authentication H=%s [%s] %s", au->name, host->name,
1106 host->address, buffer);
1107 break;
1108
1109 /* Internal problem, message in buffer. */
1110
1111 case ERROR:
1112 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1113 DEFER, FALSE);
1114 return ERROR;
1115 }
1116
1117 break; /* If not authenticated, try next authenticator */
1118 } /* Loop for scanning supported server mechanisms */
1119 } /* Loop for further authenticators */
1120 }
1121 }
1122
1123 /* If we haven't authenticated, but are required to, give up. */
1124
1125 if (require_auth == OK && !smtp_authenticated)
1126 {
1127 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1128 string_sprintf("authentication required but %s", fail_reason), DEFER,
1129 FALSE);
1130 return DEFER;
1131 }
1132
1133 return OK;
1134 }
1135
1136
1137 /* Construct AUTH appendix string for MAIL TO */
1138 /*
1139 Arguments
1140 buffer to build string
1141 addrlist chain of potential addresses to deliver
1142 ob transport options
1143
1144 Globals smtp_authenticated
1145 client_authenticated_sender
1146 Return True on error, otherwise buffer has (possibly empty) terminated string
1147 */
1148
1149 BOOL
1150 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1151 smtp_transport_options_block *ob)
1152 {
1153 uschar *local_authenticated_sender = authenticated_sender;
1154
1155 #ifdef notdef
1156 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1157 #endif
1158
1159 if (ob->authenticated_sender != NULL)
1160 {
1161 uschar *new = expand_string(ob->authenticated_sender);
1162 if (new == NULL)
1163 {
1164 if (!expand_string_forcedfail)
1165 {
1166 uschar *message = string_sprintf("failed to expand "
1167 "authenticated_sender: %s", expand_string_message);
1168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1169 return TRUE;
1170 }
1171 }
1172 else if (new[0] != 0) local_authenticated_sender = new;
1173 }
1174
1175 /* Add the authenticated sender address if present */
1176
1177 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1178 local_authenticated_sender != NULL)
1179 {
1180 string_format(buffer, bufsize, " AUTH=%s",
1181 auth_xtextencode(local_authenticated_sender,
1182 Ustrlen(local_authenticated_sender)));
1183 client_authenticated_sender = string_copy(local_authenticated_sender);
1184 }
1185 else
1186 *buffer= 0;
1187
1188 return FALSE;
1189 }
1190
1191
1192
1193 #ifdef EXPERIMENTAL_DANE
1194 /* Lookup TLSA record for host/port.
1195 Return: OK success with dnssec; DANE mode
1196 DEFER Do not use this host now, may retry later
1197 FAIL_FORCED No TLSA record; DANE not usable
1198 FAIL Do not use this connection
1199 */
1200
1201 int
1202 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1203 {
1204 /* move this out to host.c given the similarity to dns_lookup() ? */
1205 uschar buffer[300];
1206 const uschar * fullname = buffer;
1207 int rc;
1208 BOOL sec;
1209
1210 /* TLSA lookup string */
1211 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1212
1213 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1214 sec = dns_is_secure(dnsa);
1215 DEBUG(D_transport)
1216 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1217
1218 switch (rc)
1219 {
1220 case DNS_SUCCEED:
1221 if (sec) return OK;
1222
1223 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1224 /*FALLTHROUGH*/
1225 case DNS_AGAIN:
1226 return DEFER; /* just defer this TLS'd conn */
1227
1228 case DNS_NODATA: /* no TLSA RR for this lookup */
1229 case DNS_NOMATCH: /* no records at all for this lookup */
1230 return dane_required ? FAIL : FAIL_FORCED;
1231
1232 default:
1233 case DNS_FAIL:
1234 return dane_required ? FAIL : DEFER;
1235 }
1236 }
1237 #endif
1238
1239
1240
1241 typedef struct smtp_compare_s
1242 {
1243 uschar *current_sender_address;
1244 struct transport_instance *tblock;
1245 } smtp_compare_t;
1246
1247
1248 /* Create a unique string that identifies this message, it is based on
1249 sender_address, helo_data and tls_certificate if enabled.
1250 */
1251
1252 static uschar *
1253 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1254 {
1255 address_item * addr1;
1256 uschar * if1 = US"";
1257 uschar * helo1 = US"";
1258 #ifdef SUPPORT_TLS
1259 uschar * tlsc1 = US"";
1260 #endif
1261 uschar * save_sender_address = sender_address;
1262 uschar * local_identity = NULL;
1263 smtp_transport_options_block * ob =
1264 (smtp_transport_options_block *)tblock->options_block;
1265
1266 sender_address = sender;
1267
1268 addr1 = deliver_make_addr (sender, TRUE);
1269 deliver_set_expansions(addr1);
1270
1271 if (ob->interface)
1272 if1 = expand_string(ob->interface);
1273
1274 if (ob->helo_data)
1275 helo1 = expand_string(ob->helo_data);
1276
1277 #ifdef SUPPORT_TLS
1278 if (ob->tls_certificate)
1279 tlsc1 = expand_string(ob->tls_certificate);
1280 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1281 #else
1282 local_identity = string_sprintf ("%s^%s", if1, helo1);
1283 #endif
1284
1285 deliver_set_expansions(NULL);
1286 sender_address = save_sender_address;
1287
1288 return local_identity;
1289 }
1290
1291
1292
1293 /* This routine is a callback that is called from transport_check_waiting.
1294 This function will evaluate the incoming message versus the previous
1295 message. If the incoming message is using a different local identity then
1296 we will veto this new message. */
1297
1298 static BOOL
1299 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1300 {
1301 uschar * message_local_identity,
1302 * current_local_identity,
1303 * new_sender_address;
1304
1305 current_local_identity =
1306 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1307
1308 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1309 return 0;
1310
1311 message_local_identity =
1312 smtp_local_identity(new_sender_address, s_compare->tblock);
1313
1314 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1315 }
1316
1317
1318
1319 static uschar
1320 ehlo_response(uschar * buf, uschar checks)
1321 {
1322 size_t bsize = Ustrlen(buf);
1323
1324 #ifdef SUPPORT_TLS
1325 if ( checks & OPTION_TLS
1326 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~OPTION_TLS;
1328 #endif
1329
1330 if ( checks & OPTION_IGNQ
1331 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1332 PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~OPTION_IGNQ;
1334
1335 if ( checks & OPTION_CHUNKING
1336 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~OPTION_CHUNKING;
1338
1339 #ifndef DISABLE_PRDR
1340 if ( checks & OPTION_PRDR
1341 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~OPTION_PRDR;
1343 #endif
1344
1345 #ifdef SUPPORT_I18N
1346 if ( checks & OPTION_UTF8
1347 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1348 checks &= ~OPTION_UTF8;
1349 #endif
1350
1351 if ( checks & OPTION_DSN
1352 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_DSN;
1354
1355 if ( checks & OPTION_PIPE
1356 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1357 PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~OPTION_PIPE;
1359
1360 if ( checks & OPTION_SIZE
1361 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_SIZE;
1363
1364 return checks;
1365 }
1366
1367
1368
1369 /* Callback for emitting a BDAT data chunk header.
1370
1371 If given a nonzero size, first flush any buffered SMTP commands
1372 then emit the command.
1373
1374 Reap previous SMTP command responses if requested, and always reap
1375 the response from a previous BDAT command.
1376
1377 Args:
1378 tctx transport context
1379 chunk_size value for SMTP BDAT command
1380 flags
1381 tc_chunk_last add LAST option to SMTP BDAT command
1382 tc_reap_prev reap response to previous SMTP commands
1383
1384 Returns: OK or ERROR
1385 */
1386
1387 static int
1388 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1389 unsigned flags)
1390 {
1391 smtp_transport_options_block * ob =
1392 (smtp_transport_options_block *)(tctx->tblock->options_block);
1393 smtp_context * sx = tctx->smtp_context;
1394 int cmd_count = 0;
1395 int prev_cmd_count;
1396
1397 /* Write SMTP chunk header command. If not reaping responses, note that
1398 there may be more writes (like, the chunk data) done soon. */
1399
1400 if (chunk_size > 0)
1401 {
1402 if((cmd_count = smtp_write_command(&sx->outblock,
1403 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1404 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1405 ) < 0) return ERROR;
1406 if (flags & tc_chunk_last)
1407 data_command = string_copy(big_buffer); /* Save for later error message */
1408 }
1409
1410 prev_cmd_count = cmd_count += sx->cmd_count;
1411
1412 /* Reap responses for any previous, but not one we just emitted */
1413
1414 if (chunk_size > 0)
1415 prev_cmd_count--;
1416 if (sx->pending_BDAT)
1417 prev_cmd_count--;
1418
1419 if (flags & tc_reap_prev && prev_cmd_count > 0)
1420 {
1421 DEBUG(D_transport) debug_printf("look for %d responses"
1422 " for previous pipelined cmds\n", prev_cmd_count);
1423
1424 switch(sync_responses(sx, prev_cmd_count, 0))
1425 {
1426 case 1: /* 2xx (only) => OK */
1427 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1428 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1429 case 0: break; /* No 2xx or 5xx, but no probs */
1430
1431 case -1: /* Timeout on RCPT */
1432 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1433 }
1434 cmd_count = 1;
1435 if (!sx->pending_BDAT)
1436 pipelining_active = FALSE;
1437 }
1438
1439 /* Reap response for an outstanding BDAT */
1440
1441 if (sx->pending_BDAT)
1442 {
1443 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1444
1445 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1446 ob->command_timeout))
1447 {
1448 if (errno == 0 && sx->buffer[0] == '4')
1449 {
1450 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1451 sx->addrlist->more_errno |=
1452 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1453 }
1454 return ERROR;
1455 }
1456 cmd_count--;
1457 sx->pending_BDAT = FALSE;
1458 pipelining_active = FALSE;
1459 }
1460 else if (chunk_size > 0)
1461 sx->pending_BDAT = TRUE;
1462
1463
1464 sx->cmd_count = cmd_count;
1465 return OK;
1466 }
1467
1468
1469
1470 /*************************************************
1471 * Make connection for given message *
1472 *************************************************/
1473
1474 /*
1475 Arguments:
1476 ctx connection context
1477 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1478 a second attempt after TLS initialization fails
1479
1480 Returns: OK - the connection was made and the delivery attempted;
1481 fd is set in the conn context, tls_out set up.
1482 DEFER - the connection could not be made, or something failed
1483 while setting up the SMTP session, or there was a
1484 non-message-specific error, such as a timeout.
1485 ERROR - helo_data or add_headers or authenticated_sender is
1486 specified for this transport, and the string failed
1487 to expand
1488 */
1489 int
1490 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1491 {
1492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1493 dns_answer tlsa_dnsa;
1494 #endif
1495 BOOL pass_message = FALSE;
1496 uschar * message = NULL;
1497 int yield = OK;
1498 int rc;
1499
1500 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1501
1502 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1503 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1504 sx->ok = FALSE;
1505 sx->send_rset = TRUE;
1506 sx->send_quit = TRUE;
1507 sx->setting_up = TRUE;
1508 sx->esmtp = TRUE;
1509 sx->esmtp_sent = FALSE;
1510 #ifdef SUPPORT_I18N
1511 sx->utf8_needed = FALSE;
1512 #endif
1513 sx->dsn_all_lasthop = TRUE;
1514 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1515 sx->dane = FALSE;
1516 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1517 #endif
1518
1519 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1520 sx->peer_offered = 0;
1521 sx->avoid_option = 0;
1522 sx->igquotstr = US"";
1523 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1524 #ifdef EXPERIMENTAL_DSN_INFO
1525 sx->smtp_greeting = NULL;
1526 sx->helo_response = NULL;
1527 #endif
1528
1529 smtp_command = US"initial connection";
1530 sx->buffer[0] = '\0';
1531
1532 /* Set up the buffer for reading SMTP response packets. */
1533
1534 sx->inblock.buffer = sx->inbuffer;
1535 sx->inblock.buffersize = sizeof(sx->inbuffer);
1536 sx->inblock.ptr = sx->inbuffer;
1537 sx->inblock.ptrend = sx->inbuffer;
1538
1539 /* Set up the buffer for holding SMTP commands while pipelining */
1540
1541 sx->outblock.buffer = sx->outbuffer;
1542 sx->outblock.buffersize = sizeof(sx->outbuffer);
1543 sx->outblock.ptr = sx->outbuffer;
1544 sx->outblock.cmd_count = 0;
1545 sx->outblock.authenticating = FALSE;
1546
1547 /* Reset the parameters of a TLS session. */
1548
1549 tls_out.bits = 0;
1550 tls_out.cipher = NULL; /* the one we may use for this transport */
1551 tls_out.ourcert = NULL;
1552 tls_out.peercert = NULL;
1553 tls_out.peerdn = NULL;
1554 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1555 tls_out.sni = NULL;
1556 #endif
1557 tls_out.ocsp = OCSP_NOT_REQ;
1558
1559 /* Flip the legacy TLS-related variables over to the outbound set in case
1560 they're used in the context of the transport. Don't bother resetting
1561 afterward (when being used by a transport) as we're in a subprocess.
1562 For verify, unflipped once the callout is dealt with */
1563
1564 tls_modify_variables(&tls_out);
1565
1566 #ifndef SUPPORT_TLS
1567 if (sx->smtps)
1568 {
1569 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1570 DEFER, FALSE);
1571 return ERROR;
1572 }
1573 #endif
1574
1575 /* Make a connection to the host if this isn't a continued delivery, and handle
1576 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1577 specially so they can be identified for retries. */
1578
1579 if (!continue_hostname)
1580 {
1581 if (sx->verify)
1582 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1583
1584 /* Get the actual port the connection will use, into sx->host */
1585
1586 smtp_port_for_connect(sx->host, sx->port);
1587
1588 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1589 /* Do TLSA lookup for DANE */
1590 {
1591 tls_out.dane_verified = FALSE;
1592 tls_out.tlsa_usage = 0;
1593
1594 if (sx->host->dnssec == DS_YES)
1595 {
1596 if( sx->dane_required
1597 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1598 )
1599 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1600 {
1601 case OK: sx->dane = TRUE;
1602 sx->ob->tls_tempfail_tryclear = FALSE;
1603 break;
1604 case FAIL_FORCED: break;
1605 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1606 string_sprintf("DANE error: tlsa lookup %s",
1607 rc == DEFER ? "DEFER" : "FAIL"),
1608 rc, FALSE);
1609 return rc;
1610 }
1611 }
1612 else if (sx->dane_required)
1613 {
1614 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1615 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1616 FAIL, FALSE);
1617 return FAIL;
1618 }
1619 }
1620 #endif /*DANE*/
1621
1622 /* Make the TCP connection */
1623
1624 sx->inblock.sock = sx->outblock.sock =
1625 smtp_connect(sx->host, sx->host_af, sx->interface,
1626 sx->ob->connect_timeout, sx->tblock);
1627
1628 if (sx->inblock.sock < 0)
1629 {
1630 uschar * msg = NULL;
1631 if (sx->verify)
1632 {
1633 msg = US strerror(errno);
1634 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1635 }
1636 set_errno_nohost(sx->addrlist,
1637 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1638 sx->verify ? string_sprintf("could not connect: %s", msg)
1639 : NULL,
1640 DEFER, FALSE);
1641 sx->send_quit = FALSE;
1642 return DEFER;
1643 }
1644
1645 /* Expand the greeting message while waiting for the initial response. (Makes
1646 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1647 delayed till here so that $sending_interface and $sending_port are set. */
1648
1649 if (sx->helo_data)
1650 if (!(sx->helo_data = expand_string(sx->helo_data)))
1651 if (sx->verify)
1652 log_write(0, LOG_MAIN|LOG_PANIC,
1653 "<%s>: failed to expand transport's helo_data value for callout: %s",
1654 sx->addrlist->address, expand_string_message);
1655
1656 #ifdef SUPPORT_I18N
1657 if (sx->helo_data)
1658 {
1659 expand_string_message = NULL;
1660 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1661 &expand_string_message)),
1662 expand_string_message)
1663 if (sx->verify)
1664 log_write(0, LOG_MAIN|LOG_PANIC,
1665 "<%s>: failed to expand transport's helo_data value for callout: %s",
1666 sx->addrlist->address, expand_string_message);
1667 else
1668 sx->helo_data = NULL;
1669 }
1670 #endif
1671
1672 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1673 is nevertheless a reasonably clean way of programming this kind of logic,
1674 where you want to escape on any error. */
1675
1676 if (!sx->smtps)
1677 {
1678 BOOL good_response;
1679
1680 #ifdef TCP_QUICKACK
1681 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1682 #endif
1683 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1684 '2', sx->ob->command_timeout);
1685 #ifdef EXPERIMENTAL_DSN_INFO
1686 sx->smtp_greeting = string_copy(sx->buffer);
1687 #endif
1688 if (!good_response) goto RESPONSE_FAILED;
1689
1690 #ifndef DISABLE_EVENT
1691 {
1692 uschar * s;
1693 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1694 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1695 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1696 if (s)
1697 {
1698 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1699 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1700 DEFER, FALSE);
1701 yield = DEFER;
1702 goto SEND_QUIT;
1703 }
1704 }
1705 #endif
1706
1707 /* Now check if the helo_data expansion went well, and sign off cleanly if
1708 it didn't. */
1709
1710 if (!sx->helo_data)
1711 {
1712 message = string_sprintf("failed to expand helo_data: %s",
1713 expand_string_message);
1714 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1715 yield = DEFER;
1716 goto SEND_QUIT;
1717 }
1718 }
1719
1720 /** Debugging without sending a message
1721 sx->addrlist->transport_return = DEFER;
1722 goto SEND_QUIT;
1723 **/
1724
1725 /* Errors that occur after this point follow an SMTP command, which is
1726 left in big_buffer by smtp_write_command() for use in error messages. */
1727
1728 smtp_command = big_buffer;
1729
1730 /* Tell the remote who we are...
1731
1732 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1733 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1734 greeting is of this form. The assumption was that the far end supports it
1735 properly... but experience shows that there are some that give 5xx responses,
1736 even though the banner includes "ESMTP" (there's a bloody-minded one that
1737 says "ESMTP not spoken here"). Cope with that case.
1738
1739 September 2000: Time has passed, and it seems reasonable now to always send
1740 EHLO at the start. It is also convenient to make the change while installing
1741 the TLS stuff.
1742
1743 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1744 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1745 would be no way to send out the mails, so there is now a host list
1746 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1747 PIPELINING problem as well. Maybe it can also be useful to cure other
1748 problems with broken servers.
1749
1750 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1751 Then somebody tried it with a Microsoft mailer... It seems that all other
1752 mailers use upper case for some reason (the RFC is quite clear about case
1753 independence) so, for peace of mind, I gave in. */
1754
1755 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1756
1757 /* Alas; be careful, since this goto is not an error-out, so conceivably
1758 we might set data between here and the target which we assume to exist
1759 and be usable. I can see this coming back to bite us. */
1760 #ifdef SUPPORT_TLS
1761 if (sx->smtps)
1762 {
1763 smtp_peer_options |= OPTION_TLS;
1764 suppress_tls = FALSE;
1765 sx->ob->tls_tempfail_tryclear = FALSE;
1766 smtp_command = US"SSL-on-connect";
1767 goto TLS_NEGOTIATE;
1768 }
1769 #endif
1770
1771 if (sx->esmtp)
1772 {
1773 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1774 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1775 goto SEND_FAILED;
1776 sx->esmtp_sent = TRUE;
1777 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1778 sx->ob->command_timeout))
1779 {
1780 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1781 {
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(sx->buffer);
1784 #endif
1785 goto RESPONSE_FAILED;
1786 }
1787 sx->esmtp = FALSE;
1788 }
1789 #ifdef EXPERIMENTAL_DSN_INFO
1790 sx->helo_response = string_copy(sx->buffer);
1791 #endif
1792 }
1793 else
1794 DEBUG(D_transport)
1795 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1796
1797 if (!sx->esmtp)
1798 {
1799 BOOL good_response;
1800 int n = sizeof(sx->buffer);
1801 uschar * rsp = sx->buffer;
1802
1803 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1804 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1805
1806 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1807 goto SEND_FAILED;
1808 good_response = smtp_read_response(&sx->inblock, rsp, n,
1809 '2', sx->ob->command_timeout);
1810 #ifdef EXPERIMENTAL_DSN_INFO
1811 sx->helo_response = string_copy(rsp);
1812 #endif
1813 if (!good_response)
1814 {
1815 /* Handle special logging for a closed connection after HELO
1816 when had previously sent EHLO */
1817
1818 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1819 {
1820 errno = ERRNO_SMTPCLOSED;
1821 goto EHLOHELO_FAILED;
1822 }
1823 memmove(sx->buffer, rsp, Ustrlen(rsp));
1824 goto RESPONSE_FAILED;
1825 }
1826 }
1827
1828 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1829
1830 if (sx->esmtp || sx->lmtp)
1831 {
1832 sx->peer_offered = ehlo_response(sx->buffer,
1833 OPTION_TLS /* others checked later */
1834 );
1835
1836 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1837
1838 #ifdef SUPPORT_TLS
1839 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1840 #endif
1841 }
1842 }
1843
1844 /* For continuing deliveries down the same channel, having re-exec'd the socket
1845 is the standard input; for a socket held open from verify it is recorded
1846 in the cutthrough context block. Either way we don't need to redo EHLO here
1847 (but may need to do so for TLS - see below).
1848 Set up the pointer to where subsequent commands will be left, for
1849 error messages. Note that smtp_peer_options will have been
1850 set from the command line if they were set in the process that passed the
1851 connection on. */
1852
1853 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1854 as the continue goes via transport_pass_socket() and doublefork and exec.
1855 It does not wait. Unclear how we keep separate host's responses
1856 separate - we could match up by host ip+port as a bodge. */
1857
1858 else
1859 {
1860 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1861 {
1862 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1863 sx->host->port = sx->port = cutthrough.host.port;
1864 }
1865 else
1866 {
1867 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1868 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1869 }
1870 smtp_command = big_buffer;
1871 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1872
1873 /* For a continued connection with TLS being proxied for us, or a
1874 held-open verify connection with TLS, nothing more to do. */
1875
1876 if ( continue_proxy_cipher
1877 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1878 )
1879 {
1880 sx->peer_offered = smtp_peer_options;
1881 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1882 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1883 continue_proxy_cipher ? "proxied" : "verify conn with");
1884 return OK;
1885 }
1886 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1887 }
1888
1889 /* If TLS is available on this connection, whether continued or not, attempt to
1890 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1891 send another EHLO - the server may give a different answer in secure mode. We
1892 use a separate buffer for reading the response to STARTTLS so that if it is
1893 negative, the original EHLO data is available for subsequent analysis, should
1894 the client not be required to use TLS. If the response is bad, copy the buffer
1895 for error analysis. */
1896
1897 #ifdef SUPPORT_TLS
1898 if ( smtp_peer_options & OPTION_TLS
1899 && !suppress_tls
1900 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1901 && ( !sx->verify
1902 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1903 ) )
1904 {
1905 uschar buffer2[4096];
1906 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1907 goto SEND_FAILED;
1908
1909 /* If there is an I/O error, transmission of this message is deferred. If
1910 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1911 false, we also defer. However, if there is a temporary rejection of STARTTLS
1912 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1913 STARTTLS, we carry on. This means we will try to send the message in clear,
1914 unless the host is in hosts_require_tls (tested below). */
1915
1916 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1917 sx->ob->command_timeout))
1918 {
1919 if ( errno != 0
1920 || buffer2[0] == 0
1921 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1922 )
1923 {
1924 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1925 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1926 goto RESPONSE_FAILED;
1927 }
1928 }
1929
1930 /* STARTTLS accepted: try to negotiate a TLS session. */
1931
1932 else
1933 TLS_NEGOTIATE:
1934 {
1935 address_item * addr;
1936 uschar * errstr;
1937 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1938 # ifdef EXPERIMENTAL_DANE
1939 sx->dane ? &tlsa_dnsa : NULL,
1940 # endif
1941 &errstr);
1942
1943 /* TLS negotiation failed; give an error. From outside, this function may
1944 be called again to try in clear on a new connection, if the options permit
1945 it for this host. */
1946
1947 if (rc != OK)
1948 {
1949 # ifdef EXPERIMENTAL_DANE
1950 if (sx->dane) log_write(0, LOG_MAIN,
1951 "DANE attempt failed; TLS connection to %s [%s]: %s",
1952 sx->host->name, sx->host->address, errstr);
1953 # endif
1954
1955 errno = ERRNO_TLSFAILURE;
1956 message = string_sprintf("TLS session: %s", errstr);
1957 sx->send_quit = FALSE;
1958 goto TLS_FAILED;
1959 }
1960
1961 /* TLS session is set up */
1962
1963 smtp_peer_options_wrap = smtp_peer_options;
1964 for (addr = sx->addrlist; addr; addr = addr->next)
1965 if (addr->transport_return == PENDING_DEFER)
1966 {
1967 addr->cipher = tls_out.cipher;
1968 addr->ourcert = tls_out.ourcert;
1969 addr->peercert = tls_out.peercert;
1970 addr->peerdn = tls_out.peerdn;
1971 addr->ocsp = tls_out.ocsp;
1972 }
1973 }
1974 }
1975
1976 /* if smtps, we'll have smtp_command set to something else; always safe to
1977 reset it here. */
1978 smtp_command = big_buffer;
1979
1980 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1981 helo_data is null, we are dealing with a connection that was passed from
1982 another process, and so we won't have expanded helo_data above. We have to
1983 expand it here. $sending_ip_address and $sending_port are set up right at the
1984 start of the Exim process (in exim.c). */
1985
1986 if (tls_out.active >= 0)
1987 {
1988 char *greeting_cmd;
1989 BOOL good_response;
1990
1991 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1992 {
1993 uschar *message = string_sprintf("failed to expand helo_data: %s",
1994 expand_string_message);
1995 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1996 yield = DEFER;
1997 goto SEND_QUIT;
1998 }
1999
2000 /* For SMTPS we need to wait for the initial OK response. */
2001 if (sx->smtps)
2002 {
2003 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2004 '2', sx->ob->command_timeout);
2005 #ifdef EXPERIMENTAL_DSN_INFO
2006 sx->smtp_greeting = string_copy(sx->buffer);
2007 #endif
2008 if (!good_response) goto RESPONSE_FAILED;
2009 }
2010
2011 if (sx->esmtp)
2012 greeting_cmd = "EHLO";
2013 else
2014 {
2015 greeting_cmd = "HELO";
2016 DEBUG(D_transport)
2017 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2018 }
2019
2020 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2021 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2022 goto SEND_FAILED;
2023 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2024 '2', sx->ob->command_timeout);
2025 #ifdef EXPERIMENTAL_DSN_INFO
2026 sx->helo_response = string_copy(sx->buffer);
2027 #endif
2028 if (!good_response) goto RESPONSE_FAILED;
2029 smtp_peer_options = 0;
2030 }
2031
2032 /* If the host is required to use a secure channel, ensure that we
2033 have one. */
2034
2035 else if ( sx->smtps
2036 # ifdef EXPERIMENTAL_DANE
2037 || sx->dane
2038 # endif
2039 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2040 )
2041 {
2042 errno = ERRNO_TLSREQUIRED;
2043 message = string_sprintf("a TLS session is required, but %s",
2044 smtp_peer_options & OPTION_TLS
2045 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2046 goto TLS_FAILED;
2047 }
2048 #endif /*SUPPORT_TLS*/
2049
2050 /* If TLS is active, we have just started it up and re-done the EHLO command,
2051 so its response needs to be analyzed. If TLS is not active and this is a
2052 continued session down a previously-used socket, we haven't just done EHLO, so
2053 we skip this. */
2054
2055 if (continue_hostname == NULL
2056 #ifdef SUPPORT_TLS
2057 || tls_out.active >= 0
2058 #endif
2059 )
2060 {
2061 if (sx->esmtp || sx->lmtp)
2062 {
2063 sx->peer_offered = ehlo_response(sx->buffer,
2064 0 /* no TLS */
2065 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2066 | OPTION_CHUNKING
2067 | OPTION_PRDR
2068 #ifdef SUPPORT_I18N
2069 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2070 /*XXX if we hand peercaps on to continued-conn processes,
2071 must not depend on this addr */
2072 #endif
2073 | OPTION_DSN
2074 | OPTION_PIPE
2075 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2076 );
2077
2078 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2079 lmtp_ignore_quota option was set. */
2080
2081 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2082
2083 /* If the response to EHLO specified support for the SIZE parameter, note
2084 this, provided size_addition is non-negative. */
2085
2086 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2087
2088 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2089 the current host, esmtp will be false, so PIPELINING can never be used. If
2090 the current host matches hosts_avoid_pipelining, don't do it. */
2091
2092 if ( sx->peer_offered & OPTION_PIPE
2093 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2094 smtp_peer_options |= OPTION_PIPE;
2095
2096 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2097 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2098
2099 if ( sx->peer_offered & OPTION_CHUNKING
2100 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2101 sx->peer_offered &= ~OPTION_CHUNKING;
2102
2103 if (sx->peer_offered & OPTION_CHUNKING)
2104 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2105
2106 #ifndef DISABLE_PRDR
2107 if ( sx->peer_offered & OPTION_PRDR
2108 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2109 sx->peer_offered &= ~OPTION_PRDR;
2110
2111 if (sx->peer_offered & OPTION_PRDR)
2112 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2113 #endif
2114
2115 /* Note if the server supports DSN */
2116 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2117 DEBUG(D_transport) debug_printf("%susing DSN\n",
2118 sx->peer_offered & OPTION_DSN ? "" : "not ");
2119
2120 /* Note if the response to EHLO specifies support for the AUTH extension.
2121 If it has, check that this host is one we want to authenticate to, and do
2122 the business. The host name and address must be available when the
2123 authenticator's client driver is running. */
2124
2125 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2126 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2127 {
2128 default: goto SEND_QUIT;
2129 case OK: break;
2130 case FAIL_SEND: goto SEND_FAILED;
2131 case FAIL: goto RESPONSE_FAILED;
2132 }
2133 }
2134 }
2135 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2136
2137 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2138 message-specific. */
2139
2140 sx->setting_up = FALSE;
2141
2142 #ifdef SUPPORT_I18N
2143 if (sx->addrlist->prop.utf8_msg)
2144 {
2145 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2146 && !sx->addrlist->prop.utf8_downcvt_maybe;
2147 DEBUG(D_transport) if (!sx->utf8_needed)
2148 debug_printf("utf8: %s downconvert\n",
2149 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2150 }
2151
2152 /* If this is an international message we need the host to speak SMTPUTF8 */
2153 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2154 {
2155 errno = ERRNO_UTF8_FWD;
2156 goto RESPONSE_FAILED;
2157 }
2158 #endif
2159
2160 return OK;
2161
2162
2163 {
2164 int code;
2165
2166 RESPONSE_FAILED:
2167 message = NULL;
2168 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2169 sx->buffer, &code, &message, &pass_message);
2170 goto FAILED;
2171
2172 SEND_FAILED:
2173 code = '4';
2174 message = US string_sprintf("send() to %s [%s] failed: %s",
2175 sx->host->name, sx->host->address, strerror(errno));
2176 sx->send_quit = FALSE;
2177 goto FAILED;
2178
2179 EHLOHELO_FAILED:
2180 code = '4';
2181 message = string_sprintf("Remote host closed connection in response to %s"
2182 " (EHLO response was: %s)", smtp_command, sx->buffer);
2183 sx->send_quit = FALSE;
2184 goto FAILED;
2185
2186 /* This label is jumped to directly when a TLS negotiation has failed,
2187 or was not done for a host for which it is required. Values will be set
2188 in message and errno, and setting_up will always be true. Treat as
2189 a temporary error. */
2190
2191 #ifdef SUPPORT_TLS
2192 TLS_FAILED:
2193 code = '4';
2194 goto FAILED;
2195 #endif
2196
2197 /* The failure happened while setting up the call; see if the failure was
2198 a 5xx response (this will either be on connection, or following HELO - a 5xx
2199 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2200 fail all addresses, as this host is never going to accept them. For other
2201 errors during setting up (timeouts or whatever), defer all addresses, and
2202 yield DEFER, so that the host is not tried again for a while.
2203
2204 XXX This peeking for another host feels like a layering violation. We want
2205 to note the host as unusable, but down here we shouldn't know if this was
2206 the last host to try for the addr(list). Perhaps the upper layer should be
2207 the one to do set_errno() ? The problem is that currently the addr is where
2208 errno etc. are stashed, but until we run out of hosts to try the errors are
2209 host-specific. Maybe we should enhance the host_item definition? */
2210
2211 FAILED:
2212 sx->ok = FALSE; /* For when reached by GOTO */
2213 set_errno(sx->addrlist, errno, message,
2214 sx->host->next
2215 ? DEFER
2216 : code == '5'
2217 #ifdef SUPPORT_I18N
2218 || errno == ERRNO_UTF8_FWD
2219 #endif
2220 ? FAIL : DEFER,
2221 pass_message, sx->host
2222 #ifdef EXPERIMENTAL_DSN_INFO
2223 , sx->smtp_greeting, sx->helo_response
2224 #endif
2225 );
2226 yield = DEFER;
2227 }
2228
2229
2230 SEND_QUIT:
2231
2232 if (sx->send_quit)
2233 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2234
2235 #ifdef SUPPORT_TLS
2236 tls_close(FALSE, TRUE);
2237 #endif
2238
2239 /* Close the socket, and return the appropriate value, first setting
2240 works because the NULL setting is passed back to the calling process, and
2241 remote_max_parallel is forced to 1 when delivering over an existing connection,
2242 */
2243
2244 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2245 if (sx->send_quit)
2246 {
2247 shutdown(sx->outblock.sock, SHUT_WR);
2248 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2249 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2250 rc--; /* drain socket */
2251 sx->send_quit = FALSE;
2252 }
2253 (void)close(sx->inblock.sock);
2254 sx->inblock.sock = sx->outblock.sock = -1;
2255
2256 #ifndef DISABLE_EVENT
2257 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2258 #endif
2259
2260 continue_transport = NULL;
2261 continue_hostname = NULL;
2262 return yield;
2263 }
2264
2265
2266
2267
2268 /* Create the string of options that will be appended to the MAIL FROM:
2269 in the connection context buffer */
2270
2271 static int
2272 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2273 {
2274 uschar * p = sx->buffer;
2275 address_item * addr;
2276 int address_count;
2277
2278 *p = 0;
2279
2280 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2281 send it, adding something to the message size to allow for imprecision
2282 and things that get added en route. Exim keeps the number of lines
2283 in a message, so we can give an accurate value for the original message, but we
2284 need some additional to handle added headers. (Double "." characters don't get
2285 included in the count.) */
2286
2287 if ( message_size > 0
2288 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2289 {
2290 /*XXX problem here under spool_files_wireformat?
2291 Or just forget about lines? Or inflate by a fixed proportion? */
2292
2293 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2294 while (*p) p++;
2295 }
2296
2297 #ifndef DISABLE_PRDR
2298 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2299 request that */
2300
2301 sx->prdr_active = FALSE;
2302 if (sx->peer_offered & OPTION_PRDR)
2303 for (addr = addrlist; addr; addr = addr->next)
2304 if (addr->transport_return == PENDING_DEFER)
2305 {
2306 for (addr = addr->next; addr; addr = addr->next)
2307 if (addr->transport_return == PENDING_DEFER)
2308 { /* at least two recipients to send */
2309 sx->prdr_active = TRUE;
2310 sprintf(CS p, " PRDR"); p += 5;
2311 break;
2312 }
2313 break;
2314 }
2315 #endif
2316
2317 #ifdef SUPPORT_I18N
2318 /* If it supports internationalised messages, and this meesage need that,
2319 request it */
2320
2321 if ( sx->peer_offered & OPTION_UTF8
2322 && addrlist->prop.utf8_msg
2323 && !addrlist->prop.utf8_downcvt
2324 )
2325 Ustrcpy(p, " SMTPUTF8"), p += 9;
2326 #endif
2327
2328 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2329 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2330 addr && address_count < sx->max_rcpt;
2331 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2332 {
2333 address_count++;
2334 if (!(addr->dsn_flags & rf_dsnlasthop))
2335 {
2336 sx->dsn_all_lasthop = FALSE;
2337 break;
2338 }
2339 }
2340
2341 /* Add any DSN flags to the mail command */
2342
2343 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2344 {
2345 if (dsn_ret == dsn_ret_hdrs)
2346 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2347 else if (dsn_ret == dsn_ret_full)
2348 { Ustrcpy(p, " RET=FULL"); p += 9; }
2349
2350 if (dsn_envid)
2351 {
2352 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2353 while (*p) p++;
2354 }
2355 }
2356
2357 /* If an authenticated_sender override has been specified for this transport
2358 instance, expand it. If the expansion is forced to fail, and there was already
2359 an authenticated_sender for this message, the original value will be used.
2360 Other expansion failures are serious. An empty result is ignored, but there is
2361 otherwise no check - this feature is expected to be used with LMTP and other
2362 cases where non-standard addresses (e.g. without domains) might be required. */
2363
2364 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2365 return ERROR;
2366
2367 return OK;
2368 }
2369
2370
2371 static void
2372 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2373 {
2374 uschar * p = sx->buffer;
2375 *p = 0;
2376
2377 /* Add any DSN flags to the rcpt command */
2378
2379 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2380 {
2381 if (addr->dsn_flags & rf_dsnflags)
2382 {
2383 int i;
2384 BOOL first = TRUE;
2385
2386 Ustrcpy(p, " NOTIFY=");
2387 while (*p) p++;
2388 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2389 {
2390 if (!first) *p++ = ',';
2391 first = FALSE;
2392 Ustrcpy(p, rf_names[i]);
2393 while (*p) p++;
2394 }
2395 }
2396
2397 if (addr->dsn_orcpt)
2398 {
2399 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2400 addr->dsn_orcpt);
2401 while (*p) p++;
2402 }
2403 }
2404 }
2405
2406
2407
2408 /*
2409 Return:
2410 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2411 -1 MAIL response error
2412 -2 any non-MAIL read i/o error
2413 -3 non-MAIL response timeout
2414 -4 internal error; channel still usable
2415 -5 transmit failed
2416 */
2417
2418 int
2419 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2420 {
2421 address_item * addr;
2422 int address_count;
2423 int rc;
2424
2425 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2426 {
2427 *yield = ERROR;
2428 return -4;
2429 }
2430
2431 /* From here until we send the DATA command, we can make use of PIPELINING
2432 if the server host supports it. The code has to be able to check the responses
2433 at any point, for when the buffer fills up, so we write it totally generally.
2434 When PIPELINING is off, each command written reports that it has flushed the
2435 buffer. */
2436
2437 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2438
2439 {
2440 uschar * s = sx->from_addr;
2441 #ifdef SUPPORT_I18N
2442 uschar * errstr = NULL;
2443
2444 /* If we must downconvert, do the from-address here. Remember we had to
2445 for the to-addresses (done below), and also (ugly) for re-doing when building
2446 the delivery log line. */
2447
2448 if ( sx->addrlist->prop.utf8_msg
2449 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2450 )
2451 {
2452 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2453 {
2454 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2455 *yield = ERROR;
2456 return -4;
2457 }
2458 setflag(sx->addrlist, af_utf8_downcvt);
2459 }
2460 #endif
2461
2462 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2463 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2464 }
2465
2466 mail_command = string_copy(big_buffer); /* Save for later error message */
2467
2468 switch(rc)
2469 {
2470 case -1: /* Transmission error */
2471 return -5;
2472
2473 case +1: /* Cmd was sent */
2474 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2475 sx->ob->command_timeout))
2476 {
2477 if (errno == 0 && sx->buffer[0] == '4')
2478 {
2479 errno = ERRNO_MAIL4XX;
2480 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2481 }
2482 return -1;
2483 }
2484 sx->pending_MAIL = FALSE;
2485 break;
2486
2487 /* otherwise zero: command queued for pipeline */
2488 }
2489
2490 /* Pass over all the relevant recipient addresses for this host, which are the
2491 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2492 several before we have to read the responses for those seen so far. This
2493 checking is done by a subroutine because it also needs to be done at the end.
2494 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2495 the next one if not all are sent.
2496
2497 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2498 last address because we want to abort if any recipients have any kind of
2499 problem, temporary or permanent. We know that all recipient addresses will have
2500 the PENDING_DEFER status, because only one attempt is ever made, and we know
2501 that max_rcpt will be large, so all addresses will be done at once.
2502
2503 For verify we flush the pipeline after any (the only) rcpt address. */
2504
2505 for (addr = sx->first_addr, address_count = 0;
2506 addr && address_count < sx->max_rcpt;
2507 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2508 {
2509 int count;
2510 BOOL no_flush;
2511 uschar * rcpt_addr;
2512
2513 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2514 {
2515 setflag(addr, af_tcp_fastopen_conn);
2516 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2517 }
2518
2519 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2520 ? dsn_support_yes : dsn_support_no;
2521
2522 address_count++;
2523 no_flush = pipelining_active && !sx->verify
2524 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2525
2526 build_rcptcmd_options(sx, addr);
2527
2528 /* Now send the RCPT command, and process outstanding responses when
2529 necessary. After a timeout on RCPT, we just end the function, leaving the
2530 yield as OK, because this error can often mean that there is a problem with
2531 just one address, so we don't want to delay the host. */
2532
2533 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2534
2535 #ifdef SUPPORT_I18N
2536 if ( testflag(sx->addrlist, af_utf8_downcvt)
2537 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2538 )
2539 {
2540 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2541 errno = ERRNO_EXPANDFAIL;
2542 return -5; /*XXX too harsh? */
2543 }
2544 #endif
2545
2546 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2547 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2548
2549 if (count < 0) return -5;
2550 if (count > 0)
2551 {
2552 switch(sync_responses(sx, count, 0))
2553 {
2554 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2555 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2556 break;
2557
2558 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2559 if (!sx->lmtp) /* can't tell about progress yet */
2560 sx->completed_addr = TRUE;
2561 case 0: /* No 2xx or 5xx, but no probs */
2562 break;
2563
2564 case -1: return -3; /* Timeout on RCPT */
2565 case -2: return -2; /* non-MAIL read i/o error */
2566 default: return -1; /* any MAIL error */
2567 }
2568 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2569 }
2570 } /* Loop for next address */
2571
2572 tcp_out_fastopen_logged = TRUE;
2573 sx->next_addr = addr;
2574 return 0;
2575 }
2576
2577
2578 #ifdef SUPPORT_TLS
2579 /*****************************************************
2580 * Proxy TLS connection for another transport process *
2581 ******************************************************/
2582 /*
2583 Close the unused end of the pipe, fork once more, then use the given buffer
2584 as a staging area, and select on both the given fd and the TLS'd client-fd for
2585 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2586 Do blocking full-size writes, and reads under a timeout. Once both input
2587 channels are closed, exit the process.
2588
2589 Arguments:
2590 buf space to use for buffering
2591 bufsiz size of buffer
2592 pfd pipe filedescriptor array; [0] is comms to proxied process
2593 timeout per-read timeout, seconds
2594 */
2595
2596 void
2597 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2598 {
2599 fd_set rfds, efds;
2600 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2601 int rc, i, fd_bits, nbytes;
2602
2603 close(pfd[1]);
2604 if ((rc = fork()))
2605 {
2606 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2607 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2608 }
2609
2610 set_process_info("proxying TLS connection for continued transport");
2611 FD_ZERO(&rfds);
2612 FD_SET(tls_out.active, &rfds);
2613 FD_SET(pfd[0], &rfds);
2614
2615 for (fd_bits = 3; fd_bits; )
2616 {
2617 time_t time_left = timeout;
2618 time_t time_start = time(NULL);
2619
2620 /* wait for data */
2621 efds = rfds;
2622 do
2623 {
2624 struct timeval tv = { time_left, 0 };
2625
2626 rc = select(max_fd,
2627 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2628
2629 if (rc < 0 && errno == EINTR)
2630 if ((time_left -= time(NULL) - time_start) > 0) continue;
2631
2632 if (rc <= 0)
2633 {
2634 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2635 goto done;
2636 }
2637
2638 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2639 {
2640 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2641 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2642 goto done;
2643 }
2644 }
2645 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2646
2647 /* handle inbound data */
2648 if (FD_ISSET(tls_out.active, &rfds))
2649 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2650 {
2651 fd_bits &= ~1;
2652 FD_CLR(tls_out.active, &rfds);
2653 shutdown(pfd[0], SHUT_WR);
2654 timeout = 5;
2655 }
2656 else
2657 {
2658 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2659 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2660 }
2661 else if (fd_bits & 1)
2662 FD_SET(tls_out.active, &rfds);
2663
2664 /* handle outbound data */
2665 if (FD_ISSET(pfd[0], &rfds))
2666 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2667 {
2668 fd_bits = 0;
2669 tls_close(FALSE, TRUE);
2670 }
2671 else
2672 {
2673 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2674 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2675 goto done;
2676 }
2677 else if (fd_bits & 2)
2678 FD_SET(pfd[0], &rfds);
2679 }
2680
2681 done:
2682 if (running_in_test_harness) millisleep(100); /* let logging complete */
2683 exim_exit(0, US"TLS proxy");
2684 }
2685 #endif
2686
2687
2688 /*************************************************
2689 * Deliver address list to given host *
2690 *************************************************/
2691
2692 /* If continue_hostname is not null, we get here only when continuing to
2693 deliver down an existing channel. The channel was passed as the standard
2694 input. TLS is never active on a passed channel; the previous process always
2695 closes it down before passing the connection on.
2696
2697 Otherwise, we have to make a connection to the remote host, and do the
2698 initial protocol exchange.
2699
2700 When running as an MUA wrapper, if the sender or any recipient is rejected,
2701 temporarily or permanently, we force failure for all recipients.
2702
2703 Arguments:
2704 addrlist chain of potential addresses to deliver; only those whose
2705 transport_return field is set to PENDING_DEFER are currently
2706 being processed; others should be skipped - they have either
2707 been delivered to an earlier host or IP address, or been
2708 failed by one of them.
2709 host host to deliver to
2710 host_af AF_INET or AF_INET6
2711 defport default TCP/IP port to use if host does not specify, in host
2712 byte order
2713 interface interface to bind to, or NULL
2714 tblock transport instance block
2715 message_defer set TRUE if yield is OK, but all addresses were deferred
2716 because of a non-recipient, non-host failure, that is, a
2717 4xx response to MAIL FROM, DATA, or ".". This is a defer
2718 that is specific to the message.
2719 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2720 a second attempt after TLS initialization fails
2721
2722 Returns: OK - the connection was made and the delivery attempted;
2723 the result for each address is in its data block.
2724 DEFER - the connection could not be made, or something failed
2725 while setting up the SMTP session, or there was a
2726 non-message-specific error, such as a timeout.
2727 ERROR - a filter command is specified for this transport,
2728 and there was a problem setting it up; OR helo_data
2729 or add_headers or authenticated_sender is specified
2730 for this transport, and the string failed to expand
2731 */
2732
2733 static int
2734 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2735 uschar *interface, transport_instance *tblock,
2736 BOOL *message_defer, BOOL suppress_tls)
2737 {
2738 address_item *addr;
2739 int yield = OK;
2740 int save_errno;
2741 int rc;
2742 struct timeval start_delivery_time;
2743
2744 BOOL pass_message = FALSE;
2745 uschar *message = NULL;
2746 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2747
2748 smtp_context sx;
2749
2750 gettimeofday(&start_delivery_time, NULL);
2751 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2752 *message_defer = FALSE;
2753
2754 sx.addrlist = addrlist;
2755 sx.host = host;
2756 sx.host_af = host_af,
2757 sx.port = defport;
2758 sx.interface = interface;
2759 sx.helo_data = NULL;
2760 sx.tblock = tblock;
2761 sx.verify = FALSE;
2762
2763 /* Get the channel set up ready for a message (MAIL FROM being the next
2764 SMTP command to send */
2765
2766 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2767 return rc;
2768
2769 /* If there is a filter command specified for this transport, we can now
2770 set it up. This cannot be done until the identify of the host is known. */
2771
2772 if (tblock->filter_command)
2773 {
2774 transport_filter_timeout = tblock->filter_timeout;
2775
2776 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2777 yield ERROR. */
2778
2779 if (!transport_set_up_command(&transport_filter_argv,
2780 tblock->filter_command, TRUE, DEFER, addrlist,
2781 string_sprintf("%.50s transport", tblock->name), NULL))
2782 {
2783 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2784 FALSE);
2785 yield = ERROR;
2786 goto SEND_QUIT;
2787 }
2788
2789 if ( transport_filter_argv
2790 && *transport_filter_argv
2791 && **transport_filter_argv
2792 && sx.peer_offered & OPTION_CHUNKING
2793 )
2794 {
2795 sx.peer_offered &= ~OPTION_CHUNKING;
2796 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2797 }
2798 }
2799
2800 sx.first_addr = addrlist;
2801
2802 /* For messages that have more than the maximum number of envelope recipients,
2803 we want to send several transactions down the same SMTP connection. (See
2804 comments in deliver.c as to how this reconciles, heuristically, with
2805 remote_max_parallel.) This optimization was added to Exim after the following
2806 code was already working. The simplest way to put it in without disturbing the
2807 code was to use a goto to jump back to this point when there is another
2808 transaction to handle. */
2809
2810 SEND_MESSAGE:
2811 sx.from_addr = return_path;
2812 sx.sync_addr = sx.first_addr;
2813 sx.ok = FALSE;
2814 sx.send_rset = TRUE;
2815 sx.completed_addr = FALSE;
2816
2817
2818 /* If we are a continued-connection-after-verify the MAIL and RCPT
2819 commands were already sent; do not re-send but do mark the addrs as
2820 having been accepted up to RCPT stage. A traditional cont-conn
2821 always has a sequence number greater than one. */
2822
2823 if (continue_hostname && continue_sequence == 1)
2824 {
2825 address_item * addr;
2826
2827 sx.peer_offered = smtp_peer_options;
2828 sx.pending_MAIL = FALSE;
2829 sx.ok = TRUE;
2830 sx.next_addr = NULL;
2831
2832 for (addr = addrlist; addr; addr = addr->next)
2833 addr->transport_return = PENDING_OK;
2834 }
2835 else
2836 {
2837 /* Initiate a message transfer. */
2838
2839 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2840 {
2841 case 0: break;
2842 case -1: case -2: goto RESPONSE_FAILED;
2843 case -3: goto END_OFF;
2844 case -4: goto SEND_QUIT;
2845 default: goto SEND_FAILED;
2846 }
2847
2848 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2849 permanently or temporarily. We should have flushed and synced after the last
2850 RCPT. */
2851
2852 if (mua_wrapper)
2853 {
2854 address_item * a;
2855 unsigned cnt;
2856
2857 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2858 if (a->transport_return != PENDING_OK)
2859 {
2860 /*XXX could we find a better errno than 0 here? */
2861 set_errno_nohost(addrlist, 0, a->message, FAIL,
2862 testflag(a, af_pass_message));
2863 sx.ok = FALSE;
2864 break;
2865 }
2866 }
2867 }
2868
2869 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2870 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2871 have a good recipient buffered up if we are pipelining. We don't want to waste
2872 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2873 are pipelining. The responses are all handled by sync_responses().
2874 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2875 to send is. */
2876
2877 if ( !(sx.peer_offered & OPTION_CHUNKING)
2878 && (sx.ok || (pipelining_active && !mua_wrapper)))
2879 {
2880 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2881
2882 if (count < 0) goto SEND_FAILED;
2883 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2884 {
2885 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2886 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2887 break;
2888
2889 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2890 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2891 case 0: break; /* No 2xx or 5xx, but no probs */
2892
2893 case -1: goto END_OFF; /* Timeout on RCPT */
2894 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2895 }
2896 pipelining_active = FALSE;
2897 data_command = string_copy(big_buffer); /* Save for later error message */
2898 }
2899
2900 /* If there were no good recipients (but otherwise there have been no
2901 problems), just set ok TRUE, since we have handled address-specific errors
2902 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2903 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2904 well as body. Set the appropriate timeout value to be used for each chunk.
2905 (Haven't been able to make it work using select() for writing yet.) */
2906
2907 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2908 {
2909 /* Save the first address of the next batch. */
2910 sx.first_addr = sx.next_addr;
2911
2912 sx.ok = TRUE;
2913 }
2914 else
2915 {
2916 transport_ctx tctx = {
2917 {sx.inblock.sock},
2918 tblock,
2919 addrlist,
2920 US".", US"..", /* Escaping strings */
2921 topt_use_crlf | topt_escape_headers
2922 | (tblock->body_only ? topt_no_headers : 0)
2923 | (tblock->headers_only ? topt_no_body : 0)
2924 | (tblock->return_path_add ? topt_add_return_path : 0)
2925 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2926 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2927 };
2928
2929 /* If using CHUNKING we need a callback from the generic transport
2930 support to us, for the sending of BDAT smtp commands and the reaping
2931 of responses. The callback needs a whole bunch of state so set up
2932 a transport-context structure to be passed around. */
2933
2934 if (sx.peer_offered & OPTION_CHUNKING)
2935 {
2936 tctx.check_string = tctx.escape_string = NULL;
2937 tctx.options |= topt_use_bdat;
2938 tctx.chunk_cb = smtp_chunk_cmd_callback;
2939 sx.pending_BDAT = FALSE;
2940 sx.good_RCPT = sx.ok;
2941 sx.cmd_count = 0;
2942 tctx.smtp_context = &sx;
2943 }
2944 else
2945 tctx.options |= topt_end_dot;
2946
2947 /* Save the first address of the next batch. */
2948 sx.first_addr = sx.next_addr;
2949
2950 /* Responses from CHUNKING commands go in buffer. Otherwise,
2951 there has not been a response. */
2952
2953 sx.buffer[0] = 0;
2954
2955 sigalrm_seen = FALSE;
2956 transport_write_timeout = sx.ob->data_timeout;
2957 smtp_command = US"sending data block"; /* For error messages */
2958 DEBUG(D_transport|D_v)
2959 if (sx.peer_offered & OPTION_CHUNKING)
2960 debug_printf(" will write message using CHUNKING\n");
2961 else
2962 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2963 transport_count = 0;
2964
2965 #ifndef DISABLE_DKIM
2966 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2967 #else
2968 sx.ok = transport_write_message(&tctx, 0);
2969 #endif
2970
2971 /* transport_write_message() uses write() because it is called from other
2972 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2973 it can exit with "Broken pipe" as its error. This really means that the
2974 socket got closed at the far end. */
2975
2976 transport_write_timeout = 0; /* for subsequent transports */
2977
2978 /* Failure can either be some kind of I/O disaster (including timeout),
2979 or the failure of a transport filter or the expansion of added headers.
2980 Or, when CHUNKING, it can be a protocol-detected failure. */
2981
2982 if (!sx.ok)
2983 if (message) goto SEND_FAILED;
2984 else goto RESPONSE_FAILED;
2985
2986 /* We used to send the terminating "." explicitly here, but because of
2987 buffering effects at both ends of TCP/IP connections, you don't gain
2988 anything by keeping it separate, so it might as well go in the final
2989 data buffer for efficiency. This is now done by setting the topt_end_dot
2990 flag above. */
2991
2992 smtp_command = US"end of data";
2993
2994 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2995 {
2996 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2997 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2998 {
2999 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3000 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3001 break;
3002
3003 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3004 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3005 case 0: break; /* No 2xx or 5xx, but no probs */
3006
3007 case -1: goto END_OFF; /* Timeout on RCPT */
3008 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3009 }
3010 }
3011
3012 #ifndef DISABLE_PRDR
3013 /* For PRDR we optionally get a partial-responses warning
3014 * followed by the individual responses, before going on with
3015 * the overall response. If we don't get the warning then deal
3016 * with per non-PRDR. */
3017 if(sx.prdr_active)
3018 {
3019 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3020 sx.ob->final_timeout);
3021 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3022 {
3023 case '2': sx.prdr_active = FALSE;
3024 sx.ok = TRUE;
3025 break;
3026 case '4': errno = ERRNO_DATA4XX;
3027 addrlist->more_errno |=
3028 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3029 break;
3030 }
3031 }
3032 else
3033 #endif
3034
3035 /* For non-PRDR SMTP, we now read a single response that applies to the
3036 whole message. If it is OK, then all the addresses have been delivered. */
3037
3038 if (!sx.lmtp)
3039 {
3040 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3041 sx.ob->final_timeout);
3042 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3043 {
3044 errno = ERRNO_DATA4XX;
3045 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3046 }
3047 }
3048
3049 /* For LMTP, we get back a response for every RCPT command that we sent;
3050 some may be accepted and some rejected. For those that get a response, their
3051 status is fixed; any that are accepted have been handed over, even if later
3052 responses crash - at least, that's how I read RFC 2033.
3053
3054 If all went well, mark the recipient addresses as completed, record which
3055 host/IPaddress they were delivered to, and cut out RSET when sending another
3056 message down the same channel. Write the completed addresses to the journal
3057 now so that they are recorded in case there is a crash of hardware or
3058 software before the spool gets updated. Also record the final SMTP
3059 confirmation if needed (for SMTP only). */
3060
3061 if (sx.ok)
3062 {
3063 int flag = '=';
3064 struct timeval delivery_time;
3065 int len;
3066 uschar * conf = NULL;
3067
3068 timesince(&delivery_time, &start_delivery_time);
3069 sx.send_rset = FALSE;
3070 pipelining_active = FALSE;
3071
3072 /* Set up confirmation if needed - applies only to SMTP */
3073
3074 if (
3075 #ifdef DISABLE_EVENT
3076 LOGGING(smtp_confirmation) &&
3077 #endif
3078 !sx.lmtp
3079 )
3080 {
3081 const uschar *s = string_printing(sx.buffer);
3082 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3083 conf = (s == sx.buffer)? US string_copy(s) : US s;
3084 }
3085
3086 /* Process all transported addresses - for LMTP or PRDR, read a status for
3087 each one. */
3088
3089 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3090 {
3091 if (addr->transport_return != PENDING_OK) continue;
3092
3093 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3094 remaining addresses. Otherwise, it's a return code for just the one
3095 address. For temporary errors, add a retry item for the address so that
3096 it doesn't get tried again too soon. */
3097
3098 #ifndef DISABLE_PRDR
3099 if (sx.lmtp || sx.prdr_active)
3100 #else
3101 if (sx.lmtp)
3102 #endif
3103 {
3104 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3105 sx.ob->final_timeout))
3106 {
3107 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3108 addr->message = string_sprintf(
3109 #ifndef DISABLE_PRDR
3110 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3111 #else
3112 "LMTP error after %s: %s",
3113 #endif
3114 data_command, string_printing(sx.buffer));
3115 setflag(addr, af_pass_message); /* Allow message to go to user */
3116 if (sx.buffer[0] == '5')
3117 addr->transport_return = FAIL;
3118 else
3119 {
3120 errno = ERRNO_DATA4XX;
3121 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3122 addr->transport_return = DEFER;
3123 #ifndef DISABLE_PRDR
3124 if (!sx.prdr_active)
3125 #endif
3126 retry_add_item(addr, addr->address_retry_key, 0);
3127 }
3128 continue;
3129 }
3130 sx.completed_addr = TRUE; /* NOW we can set this flag */
3131 if (LOGGING(smtp_confirmation))
3132 {
3133 const uschar *s = string_printing(sx.buffer);
3134 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3135 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3136 }
3137 }
3138
3139 /* SMTP, or success return from LMTP for this address. Pass back the
3140 actual host that was used. */
3141
3142 addr->transport_return = OK;
3143 addr->more_errno = delivery_time.tv_sec;
3144 addr->delivery_usec = delivery_time.tv_usec;
3145 addr->host_used = host;
3146 addr->special_action = flag;
3147 addr->message = conf;
3148 #ifndef DISABLE_PRDR
3149 if (sx.prdr_active) setflag(addr, af_prdr_used);
3150 #endif
3151 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3152 flag = '-';
3153
3154 #ifndef DISABLE_PRDR
3155 if (!sx.prdr_active)
3156 #endif
3157 {
3158 /* Update the journal. For homonymic addresses, use the base address plus
3159 the transport name. See lots of comments in deliver.c about the reasons
3160 for the complications when homonyms are involved. Just carry on after
3161 write error, as it may prove possible to update the spool file later. */
3162
3163 if (testflag(addr, af_homonym))
3164 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3165 else
3166 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3167
3168 DEBUG(D_deliver) debug_printf("S:journalling %s", sx.buffer);
3169 len = Ustrlen(CS sx.buffer);
3170 if (write(journal_fd, sx.buffer, len) != len)
3171 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3172 "%s: %s", sx.buffer, strerror(errno));
3173 }
3174 }
3175
3176 #ifndef DISABLE_PRDR
3177 if (sx.prdr_active)
3178 {
3179 /* PRDR - get the final, overall response. For any non-success
3180 upgrade all the address statuses. */
3181 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3182 sx.ob->final_timeout);
3183 if (!sx.ok)
3184 {
3185 if(errno == 0 && sx.buffer[0] == '4')
3186 {
3187 errno = ERRNO_DATA4XX;
3188 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3189 }
3190 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3191 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3192 addr->transport_return = PENDING_OK; /* allow set_errno action */
3193 goto RESPONSE_FAILED;
3194 }
3195
3196 /* Update the journal, or setup retry. */
3197 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3198 if (addr->transport_return == OK)
3199 {
3200 if (testflag(addr, af_homonym))
3201 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3202 else
3203 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3204
3205 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3206 len = Ustrlen(CS sx.buffer);
3207 if (write(journal_fd, sx.buffer, len) != len)
3208 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3209 "%s: %s", sx.buffer, strerror(errno));
3210 }
3211 else if (addr->transport_return == DEFER)
3212 retry_add_item(addr, addr->address_retry_key, -2);
3213 }
3214 #endif
3215
3216 /* Ensure the journal file is pushed out to disk. */
3217
3218 if (EXIMfsync(journal_fd) < 0)
3219 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3220 strerror(errno));
3221 }
3222 }
3223
3224
3225 /* Handle general (not specific to one address) failures here. The value of ok
3226 is used to skip over this code on the falling through case. A timeout causes a
3227 deferral. Other errors may defer or fail according to the response code, and
3228 may set up a special errno value, e.g. after connection chopped, which is
3229 assumed if errno == 0 and there is no text in the buffer. If control reaches
3230 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3231 the problem is not related to this specific message. */
3232
3233 if (!sx.ok)
3234 {
3235 int code, set_rc;
3236 uschar * set_message;
3237
3238 RESPONSE_FAILED:
3239 {
3240 save_errno = errno;
3241 message = NULL;
3242 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3243 sx.buffer, &code, &message, &pass_message);
3244 goto FAILED;
3245 }
3246
3247 SEND_FAILED:
3248 {
3249 save_errno = errno;
3250 code = '4';
3251 message = string_sprintf("send() to %s [%s] failed: %s",
3252 host->name, host->address, message ? message : US strerror(save_errno));
3253 sx.send_quit = FALSE;
3254 goto FAILED;
3255 }
3256
3257 FAILED:
3258 {
3259 BOOL message_error;
3260
3261 sx.ok = FALSE; /* For when reached by GOTO */
3262 set_message = message;
3263
3264 /* We want to handle timeouts after MAIL or "." and loss of connection after
3265 "." specially. They can indicate a problem with the sender address or with
3266 the contents of the message rather than a real error on the connection. These
3267 cases are treated in the same way as a 4xx response. This next bit of code
3268 does the classification. */
3269
3270 switch(save_errno)
3271 {
3272 case 0:
3273 case ERRNO_MAIL4XX:
3274 case ERRNO_DATA4XX:
3275 message_error = TRUE;
3276 break;
3277
3278 case ETIMEDOUT:
3279 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3280 Ustrncmp(smtp_command,"end ",4) == 0;
3281 break;
3282
3283 case ERRNO_SMTPCLOSED:
3284 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3285 break;
3286
3287 default:
3288 message_error = FALSE;
3289 break;
3290 }
3291
3292 /* Handle the cases that are treated as message errors. These are:
3293
3294 (a) negative response or timeout after MAIL
3295 (b) negative response after DATA
3296 (c) negative response or timeout or dropped connection after "."
3297 (d) utf8 support required and not offered
3298
3299 It won't be a negative response or timeout after RCPT, as that is dealt
3300 with separately above. The action in all cases is to set an appropriate
3301 error code for all the addresses, but to leave yield set to OK because the
3302 host itself has not failed. Of course, it might in practice have failed
3303 when we've had a timeout, but if so, we'll discover that at the next
3304 delivery attempt. For a temporary error, set the message_defer flag, and
3305 write to the logs for information if this is not the last host. The error
3306 for the last host will be logged as part of the address's log line. */
3307
3308 if (message_error)
3309 {
3310 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3311
3312 /* If there's an errno, the message contains just the identity of
3313 the host. */
3314
3315 if (code == '5')
3316 set_rc = FAIL;
3317 else /* Anything other than 5 is treated as temporary */
3318 {
3319 set_rc = DEFER;
3320 if (save_errno > 0)
3321 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3322 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3323 msglog_line(host, message);
3324 *message_defer = TRUE;
3325 }
3326 }
3327
3328 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3329 ".", or some other transportation error. We defer all addresses and yield
3330 DEFER, except for the case of failed add_headers expansion, or a transport
3331 filter failure, when the yield should be ERROR, to stop it trying other
3332 hosts. */
3333
3334 else
3335 {
3336 set_rc = DEFER;
3337 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3338 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3339 }
3340 }
3341
3342 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3343 #ifdef EXPERIMENTAL_DSN_INFO
3344 , sx.smtp_greeting, sx.helo_response
3345 #endif
3346 );
3347 }
3348
3349
3350 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3351 SMTP session tidily. However, if there were too many addresses to send in one
3352 message (indicated by first_addr being non-NULL) we want to carry on with the
3353 rest of them. Also, it is desirable to send more than one message down the SMTP
3354 connection if there are several waiting, provided we haven't already sent so
3355 many as to hit the configured limit. The function transport_check_waiting looks
3356 for a waiting message and returns its id. Then transport_pass_socket tries to
3357 set up a continued delivery by passing the socket on to another process. The
3358 variable send_rset is FALSE if a message has just been successfully transfered.
3359
3360 If we are already sending down a continued channel, there may be further
3361 addresses not yet delivered that are aimed at the same host, but which have not
3362 been passed in this run of the transport. In this case, continue_more will be
3363 true, and all we should do is send RSET if necessary, and return, leaving the
3364 channel open.
3365
3366 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3367 do not want to continue with other messages down the same channel, because that
3368 can lead to looping between two or more messages, all with the same,
3369 temporarily failing address(es). [The retry information isn't updated yet, so
3370 new processes keep on trying.] We probably also don't want to try more of this
3371 message's addresses either.
3372
3373 If we have started a TLS session, we have to end it before passing the
3374 connection to a new process. However, not all servers can handle this (Exim
3375 can), so we do not pass such a connection on if the host matches
3376 hosts_nopass_tls. */
3377
3378 DEBUG(D_transport)
3379 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3380 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3381 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3382
3383 if (sx.completed_addr && sx.ok && sx.send_quit)
3384 {
3385 BOOL more;
3386 smtp_compare_t t_compare;
3387
3388 t_compare.tblock = tblock;
3389 t_compare.current_sender_address = sender_address;
3390
3391 if ( sx.first_addr != NULL
3392 || continue_more
3393 || (
3394 #ifdef SUPPORT_TLS
3395 ( tls_out.active < 0 && !continue_proxy_cipher
3396 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3397 )
3398 &&
3399 #endif
3400 transport_check_waiting(tblock->name, host->name,
3401 tblock->connection_max_messages, new_message_id, &more,
3402 (oicf)smtp_are_same_identities, (void*)&t_compare)
3403 ) )
3404 {
3405 uschar *msg;
3406 BOOL pass_message;
3407
3408 if (sx.send_rset)
3409 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3410 {
3411 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3412 host->address, strerror(errno));
3413 sx.send_quit = FALSE;
3414 }
3415 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3416 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3417 {
3418 int code;
3419 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3420 &pass_message);
3421 if (!sx.send_quit)
3422 {
3423 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3424 host->name, host->address, msg);
3425 }
3426 }
3427
3428 /* Either RSET was not needed, or it succeeded */
3429
3430 if (sx.ok)
3431 {
3432 int pfd[2];
3433 int socket_fd = sx.inblock.sock;
3434
3435
3436 if (sx.first_addr != NULL) /* More addresses still to be sent */
3437 { /* in this run of the transport */
3438 continue_sequence++; /* Causes * in logging */
3439 goto SEND_MESSAGE;
3440 }
3441
3442 /* Unless caller said it already has more messages listed for this host,
3443 pass the connection on to a new Exim process (below, the call to
3444 transport_pass_socket). If the caller has more ready, just return with
3445 the connection still open. */
3446
3447 #ifdef SUPPORT_TLS
3448 if (tls_out.active >= 0)
3449 if ( continue_more
3450 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3451 {
3452 /* Before passing the socket on, or returning to caller with it still
3453 open, we must shut down TLS. Not all MTAs allow for the continuation
3454 of the SMTP session when TLS is shut down. We test for this by sending
3455 a new EHLO. If we don't get a good response, we don't attempt to pass
3456 the socket on. */
3457
3458 tls_close(FALSE, TRUE);
3459 smtp_peer_options = smtp_peer_options_wrap;
3460 sx.ok = !sx.smtps
3461 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3462 "EHLO %s\r\n", sx.helo_data) >= 0
3463 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3464 '2', sx.ob->command_timeout);
3465
3466 if (sx.ok && continue_more)
3467 return yield; /* More addresses for another run */
3468 }
3469 else
3470 {
3471 /* Set up a pipe for proxying TLS for the new transport process */
3472
3473 smtp_peer_options |= OPTION_TLS;
3474 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3475 socket_fd = pfd[1];
3476 else
3477 set_errno(sx.first_addr, errno, US"internal allocation problem",
3478 DEFER, FALSE, host
3479 # ifdef EXPERIMENTAL_DSN_INFO
3480 , sx.smtp_greeting, sx.helo_response
3481 # endif
3482 );
3483 }
3484 else
3485 #endif
3486 if (continue_more)
3487 return yield; /* More addresses for another run */
3488
3489 /* If the socket is successfully passed, we mustn't send QUIT (or
3490 indeed anything!) from here. */
3491
3492 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3493 propagate it from the initial
3494 */
3495 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3496 host->address, new_message_id, socket_fd))
3497 {
3498 sx.send_quit = FALSE;
3499
3500 /* We have passed the client socket to a fresh transport process.
3501 If TLS is still active, we need to proxy it for the transport we
3502 just passed the baton to. Fork a child to to do it, and return to
3503 get logging done asap. Which way to place the work makes assumptions
3504 about post-fork prioritisation which may not hold on all platforms. */
3505 #ifdef SUPPORT_TLS
3506 if (tls_out.active >= 0)
3507 {
3508 int pid = fork();
3509 if (pid == 0) /* child; fork again to disconnect totally */
3510 /* does not return */
3511 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3512 sx.ob->command_timeout);
3513
3514 if (pid > 0) /* parent */
3515 {
3516 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3517 close(pfd[0]);
3518 /* tidy the inter-proc to disconn the proxy proc */
3519 waitpid(pid, NULL, 0);
3520 tls_close(FALSE, FALSE);
3521 (void)close(sx.inblock.sock);
3522 continue_transport = NULL;
3523 continue_hostname = NULL;
3524 return yield;
3525 }
3526 log_write(0, LOG_PANIC_DIE, "fork failed");
3527 }
3528 #endif
3529 }
3530 }
3531
3532 /* If RSET failed and there are addresses left, they get deferred. */
3533 else
3534 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3535 #ifdef EXPERIMENTAL_DSN_INFO
3536 , sx.smtp_greeting, sx.helo_response
3537 #endif
3538 );
3539 }
3540 }
3541
3542 /* End off tidily with QUIT unless the connection has died or the socket has
3543 been passed to another process. There has been discussion on the net about what
3544 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3545 to wait for a response, but on the other hand, there isn't anything one can do
3546 with an error response, other than log it. Exim used to do that. However,
3547 further discussion suggested that it is positively advantageous not to wait for
3548 the response, but to close the session immediately. This is supposed to move
3549 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3550 load from the server. (Hosts that are both servers and clients may not see much
3551 difference, of course.) Further discussion indicated that this was safe to do
3552 on Unix systems which have decent implementations of TCP/IP that leave the
3553 connection around for a while (TIME_WAIT) after the application has gone away.
3554 This enables the response sent by the server to be properly ACKed rather than
3555 timed out, as can happen on broken TCP/IP implementations on other OS.
3556
3557 This change is being made on 31-Jul-98. After over a year of trouble-free
3558 operation, the old commented-out code was removed on 17-Sep-99. */
3559
3560 SEND_QUIT:
3561 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3562
3563 END_OFF:
3564
3565 #ifdef SUPPORT_TLS
3566 tls_close(FALSE, TRUE);
3567 #endif
3568
3569 /* Close the socket, and return the appropriate value, first setting
3570 works because the NULL setting is passed back to the calling process, and
3571 remote_max_parallel is forced to 1 when delivering over an existing connection,
3572
3573 If all went well and continue_more is set, we shouldn't actually get here if
3574 there are further addresses, as the return above will be taken. However,
3575 writing RSET might have failed, or there may be other addresses whose hosts are
3576 specified in the transports, and therefore not visible at top level, in which
3577 case continue_more won't get set. */
3578
3579 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3580 if (sx.send_quit)
3581 {
3582 shutdown(sx.outblock.sock, SHUT_WR);
3583 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3584 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3585 rc--; /* drain socket */
3586 }
3587 (void)close(sx.inblock.sock);
3588
3589 #ifndef DISABLE_EVENT
3590 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3591 #endif
3592
3593 continue_transport = NULL;
3594 continue_hostname = NULL;
3595 return yield;
3596 }
3597
3598
3599
3600
3601 /*************************************************
3602 * Closedown entry point *
3603 *************************************************/
3604
3605 /* This function is called when exim is passed an open smtp channel
3606 from another incarnation, but the message which it has been asked
3607 to deliver no longer exists. The channel is on stdin.
3608
3609 We might do fancy things like looking for another message to send down
3610 the channel, but if the one we sought has gone, it has probably been
3611 delivered by some other process that itself will seek further messages,
3612 so just close down our connection.
3613
3614 Argument: pointer to the transport instance block
3615 Returns: nothing
3616 */
3617
3618 void
3619 smtp_transport_closedown(transport_instance *tblock)
3620 {
3621 smtp_transport_options_block *ob =
3622 (smtp_transport_options_block *)tblock->options_block;
3623 smtp_inblock inblock;
3624 smtp_outblock outblock;
3625 uschar buffer[256];
3626 uschar inbuffer[4096];
3627 uschar outbuffer[16];
3628
3629 inblock.sock = fileno(stdin);
3630 inblock.buffer = inbuffer;
3631 inblock.buffersize = sizeof(inbuffer);
3632 inblock.ptr = inbuffer;
3633 inblock.ptrend = inbuffer;
3634
3635 outblock.sock = inblock.sock;
3636 outblock.buffersize = sizeof(outbuffer);
3637 outblock.buffer = outbuffer;
3638 outblock.ptr = outbuffer;
3639 outblock.cmd_count = 0;
3640 outblock.authenticating = FALSE;
3641
3642 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3643 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3644 ob->command_timeout);
3645 (void)close(inblock.sock);
3646 }
3647
3648
3649
3650 /*************************************************
3651 * Prepare addresses for delivery *
3652 *************************************************/
3653
3654 /* This function is called to flush out error settings from previous delivery
3655 attempts to other hosts. It also records whether we got here via an MX record
3656 or not in the more_errno field of the address. We are interested only in
3657 addresses that are still marked DEFER - others may have got delivered to a
3658 previously considered IP address. Set their status to PENDING_DEFER to indicate
3659 which ones are relevant this time.
3660
3661 Arguments:
3662 addrlist the list of addresses
3663 host the host we are delivering to
3664
3665 Returns: the first address for this delivery
3666 */
3667
3668 static address_item *
3669 prepare_addresses(address_item *addrlist, host_item *host)
3670 {
3671 address_item *first_addr = NULL;
3672 address_item *addr;
3673 for (addr = addrlist; addr; addr = addr->next)
3674 if (addr->transport_return == DEFER)
3675 {
3676 if (!first_addr) first_addr = addr;
3677 addr->transport_return = PENDING_DEFER;
3678 addr->basic_errno = 0;
3679 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3680 addr->message = NULL;
3681 #ifdef SUPPORT_TLS
3682 addr->cipher = NULL;
3683 addr->ourcert = NULL;
3684 addr->peercert = NULL;
3685 addr->peerdn = NULL;
3686 addr->ocsp = OCSP_NOT_REQ;
3687 #endif
3688 #ifdef EXPERIMENTAL_DSN_INFO
3689 addr->smtp_greeting = NULL;
3690 addr->helo_response = NULL;
3691 #endif
3692 }
3693 return first_addr;
3694 }
3695
3696
3697
3698 /*************************************************
3699 * Main entry point *
3700 *************************************************/
3701
3702 /* See local README for interface details. As this is a remote transport, it is
3703 given a chain of addresses to be delivered in one connection, if possible. It
3704 always returns TRUE, indicating that each address has its own independent
3705 status set, except if there is a setting up problem, in which case it returns
3706 FALSE. */
3707
3708 BOOL
3709 smtp_transport_entry(
3710 transport_instance *tblock, /* data for this instantiation */
3711 address_item *addrlist) /* addresses we are working on */
3712 {
3713 int cutoff_retry;
3714 int defport;
3715 int hosts_defer = 0;
3716 int hosts_fail = 0;
3717 int hosts_looked_up = 0;
3718 int hosts_retry = 0;
3719 int hosts_serial = 0;
3720 int hosts_total = 0;
3721 int total_hosts_tried = 0;
3722 address_item *addr;
3723 BOOL expired = TRUE;
3724 uschar *expanded_hosts = NULL;
3725 uschar *pistring;
3726 uschar *tid = string_sprintf("%s transport", tblock->name);
3727 smtp_transport_options_block *ob =
3728 (smtp_transport_options_block *)(tblock->options_block);
3729 host_item *hostlist = addrlist->host_list;
3730 host_item *host = NULL;
3731
3732 DEBUG(D_transport)
3733 {
3734 debug_printf("%s transport entered\n", tblock->name);
3735 for (addr = addrlist; addr; addr = addr->next)
3736 debug_printf(" %s\n", addr->address);
3737 if (hostlist)
3738 {
3739 debug_printf("hostlist:\n");
3740 for (host = hostlist; host; host = host->next)
3741 debug_printf(" %s:%d\n", host->name, host->port);
3742 }
3743 if (continue_hostname)
3744 debug_printf("already connected to %s [%s] (on fd %d)\n",
3745 continue_hostname, continue_host_address,
3746 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3747 }
3748
3749 /* Set the flag requesting that these hosts be added to the waiting
3750 database if the delivery fails temporarily or if we are running with
3751 queue_smtp or a 2-stage queue run. This gets unset for certain
3752 kinds of error, typically those that are specific to the message. */
3753
3754 update_waiting = TRUE;
3755
3756 /* If a host list is not defined for the addresses - they must all have the
3757 same one in order to be passed to a single transport - or if the transport has
3758 a host list with hosts_override set, use the host list supplied with the
3759 transport. It is an error for this not to exist. */
3760
3761 if (!hostlist || (ob->hosts_override && ob->hosts))
3762 {
3763 if (!ob->hosts)
3764 {
3765 addrlist->message = string_sprintf("%s transport called with no hosts set",
3766 tblock->name);
3767 addrlist->transport_return = PANIC;
3768 return FALSE; /* Only top address has status */
3769 }
3770
3771 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3772 ob->hosts);
3773
3774 /* If the transport's host list contains no '$' characters, and we are not
3775 randomizing, it is fixed and therefore a chain of hosts can be built once
3776 and for all, and remembered for subsequent use by other calls to this
3777 transport. If, on the other hand, the host list does contain '$', or we are
3778 randomizing its order, we have to rebuild it each time. In the fixed case,
3779 as the hosts string will never be used again, it doesn't matter that we
3780 replace all the : characters with zeros. */
3781
3782 if (!ob->hostlist)
3783 {
3784 uschar *s = ob->hosts;
3785
3786 if (Ustrchr(s, '$') != NULL)
3787 {
3788 if (!(expanded_hosts = expand_string(s)))
3789 {
3790 addrlist->message = string_sprintf("failed to expand list of hosts "
3791 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3792 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3793 return FALSE; /* Only top address has status */
3794 }
3795 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3796 "\"%s\"\n", s, expanded_hosts);
3797 s = expanded_hosts;
3798 }
3799 else
3800 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3801
3802 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3803
3804 /* Check that the expansion yielded something useful. */
3805 if (!hostlist)
3806 {
3807 addrlist->message =
3808 string_sprintf("%s transport has empty hosts setting", tblock->name);
3809 addrlist->transport_return = PANIC;
3810 return FALSE; /* Only top address has status */
3811 }
3812
3813 /* If there was no expansion of hosts, save the host list for
3814 next time. */
3815
3816 if (!expanded_hosts) ob->hostlist = hostlist;
3817 }
3818
3819 /* This is not the first time this transport has been run in this delivery;
3820 the host list was built previously. */
3821
3822 else
3823 hostlist = ob->hostlist;
3824 }
3825
3826 /* The host list was supplied with the address. If hosts_randomize is set, we
3827 must sort it into a random order if it did not come from MX records and has not
3828 already been randomized (but don't bother if continuing down an existing
3829 connection). */
3830
3831 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3832 {
3833 host_item *newlist = NULL;
3834 while (hostlist)
3835 {
3836 host_item *h = hostlist;
3837 hostlist = hostlist->next;
3838
3839 h->sort_key = random_number(100);
3840
3841 if (!newlist)
3842 {
3843 h->next = NULL;
3844 newlist = h;
3845 }
3846 else if (h->sort_key < newlist->sort_key)
3847 {
3848 h->next = newlist;
3849 newlist = h;
3850 }
3851 else
3852 {
3853 host_item *hh = newlist;
3854 while (hh->next)
3855 {
3856 if (h->sort_key < hh->next->sort_key) break;
3857 hh = hh->next;
3858 }
3859 h->next = hh->next;
3860 hh->next = h;
3861 }
3862 }
3863
3864 hostlist = addrlist->host_list = newlist;
3865 }
3866
3867 /* Sort out the default port. */
3868
3869 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3870
3871 /* For each host-plus-IP-address on the list:
3872
3873 . If this is a continued delivery and the host isn't the one with the
3874 current connection, skip.
3875
3876 . If the status is unusable (i.e. previously failed or retry checked), skip.
3877
3878 . If no IP address set, get the address, either by turning the name into
3879 an address, calling gethostbyname if gethostbyname is on, or by calling
3880 the DNS. The DNS may yield multiple addresses, in which case insert the
3881 extra ones into the list.
3882
3883 . Get the retry data if not previously obtained for this address and set the
3884 field which remembers the state of this address. Skip if the retry time is
3885 not reached. If not, remember whether retry data was found. The retry string
3886 contains both the name and the IP address.
3887
3888 . Scan the list of addresses and mark those whose status is DEFER as
3889 PENDING_DEFER. These are the only ones that will be processed in this cycle
3890 of the hosts loop.
3891
3892 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3893 Some addresses may be successfully delivered, others may fail, and yet
3894 others may get temporary errors and so get marked DEFER.
3895
3896 . The return from the delivery attempt is OK if a connection was made and a
3897 valid SMTP dialogue was completed. Otherwise it is DEFER.
3898
3899 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3900
3901 . If fail to connect, or other defer state, add a retry item.
3902
3903 . If there are any addresses whose status is still DEFER, carry on to the
3904 next host/IPaddress, unless we have tried the number of hosts given
3905 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3906 there is some fancy logic for hosts_max_try that means its limit can be
3907 overstepped in some circumstances.
3908
3909 If we get to the end of the list, all hosts have deferred at least one address,
3910 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3911 delivery attempt to those hosts whose last try was before the arrival time of
3912 the current message. To cope with this, we have to go round the loop a second
3913 time. After that, set the status and error data for any addresses that haven't
3914 had it set already. */
3915
3916 for (cutoff_retry = 0;
3917 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3918 cutoff_retry++)
3919 {
3920 host_item *nexthost = NULL;
3921 int unexpired_hosts_tried = 0;
3922
3923 for (host = hostlist;
3924 host
3925 && unexpired_hosts_tried < ob->hosts_max_try
3926 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3927 host = nexthost)
3928 {
3929 int rc;
3930 int host_af;
3931 uschar *rs;
3932 BOOL host_is_expired = FALSE;
3933 BOOL message_defer = FALSE;
3934 BOOL some_deferred = FALSE;
3935 address_item *first_addr = NULL;
3936 uschar *interface = NULL;
3937 uschar *retry_host_key = NULL;
3938 uschar *retry_message_key = NULL;
3939 uschar *serialize_key = NULL;
3940
3941 /* Default next host is next host. :-) But this can vary if the
3942 hosts_max_try limit is hit (see below). It may also be reset if a host
3943 address is looked up here (in case the host was multihomed). */
3944
3945 nexthost = host->next;
3946
3947 /* If the address hasn't yet been obtained from the host name, look it up
3948 now, unless the host is already marked as unusable. If it is marked as
3949 unusable, it means that the router was unable to find its IP address (in
3950 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3951 the lookup failed last time. We don't get this far if *all* MX records
3952 point to non-existent hosts; that is treated as a hard error.
3953
3954 We can just skip this host entirely. When the hosts came from the router,
3955 the address will timeout based on the other host(s); when the address is
3956 looked up below, there is an explicit retry record added.
3957
3958 Note that we mustn't skip unusable hosts if the address is not unset; they
3959 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3960
3961 if (!host->address)
3962 {
3963 int new_port, flags;
3964 host_item *hh;
3965
3966 if (host->status >= hstatus_unusable)
3967 {
3968 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3969 host->name);
3970 continue;
3971 }
3972
3973 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3974
3975 /* The host name is permitted to have an attached port. Find it, and
3976 strip it from the name. Just remember it for now. */
3977
3978 new_port = host_item_get_port(host);
3979
3980 /* Count hosts looked up */
3981
3982 hosts_looked_up++;
3983
3984 /* Find by name if so configured, or if it's an IP address. We don't
3985 just copy the IP address, because we need the test-for-local to happen. */
3986
3987 flags = HOST_FIND_BY_A;
3988 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3989 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3990
3991 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3992 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3993 else
3994 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3995 &ob->dnssec, /* domains for request/require */
3996 NULL, NULL);
3997
3998 /* Update the host (and any additional blocks, resulting from
3999 multihoming) with a host-specific port, if any. */
4000
4001 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4002
4003 /* Failure to find the host at this time (usually DNS temporary failure)
4004 is really a kind of routing failure rather than a transport failure.
4005 Therefore we add a retry item of the routing kind, not to stop us trying
4006 to look this name up here again, but to ensure the address gets timed
4007 out if the failures go on long enough. A complete failure at this point
4008 commonly points to a configuration error, but the best action is still
4009 to carry on for the next host. */
4010
4011 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4012 {
4013 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4014 expired = FALSE;
4015 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4016 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4017 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4018 host->status = hstatus_unusable;
4019
4020 for (addr = addrlist; addr; addr = addr->next)
4021 {
4022 if (addr->transport_return != DEFER) continue;
4023 addr->basic_errno = ERRNO_UNKNOWNHOST;
4024 addr->message = string_sprintf(
4025 rc == HOST_FIND_SECURITY
4026 ? "lookup of IP address for %s was insecure"
4027 : "failed to lookup IP address for %s",
4028 host->name);
4029 }
4030 continue;
4031 }
4032
4033 /* If the host is actually the local host, we may have a problem, or
4034 there may be some cunning configuration going on. In the problem case,
4035 log things and give up. The default transport status is already DEFER. */
4036
4037 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4038 {
4039 for (addr = addrlist; addr; addr = addr->next)
4040 {
4041 addr->basic_errno = 0;
4042 addr->message = string_sprintf("%s transport found host %s to be "
4043 "local", tblock->name, host->name);
4044 }
4045 goto END_TRANSPORT;
4046 }
4047 } /* End of block for IP address lookup */
4048
4049 /* If this is a continued delivery, we are interested only in the host
4050 which matches the name of the existing open channel. The check is put
4051 here after the local host lookup, in case the name gets expanded as a
4052 result of the lookup. Set expired FALSE, to save the outer loop executing
4053 twice. */
4054
4055 if ( continue_hostname
4056 && ( Ustrcmp(continue_hostname, host->name) != 0
4057 || Ustrcmp(continue_host_address, host->address) != 0
4058 ) )
4059 {
4060 expired = FALSE;
4061 continue; /* With next host */
4062 }
4063
4064 /* Reset the default next host in case a multihomed host whose addresses
4065 are not looked up till just above added to the host list. */
4066
4067 nexthost = host->next;
4068
4069 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4070 domain is in queue_smtp_domains, we don't actually want to attempt any
4071 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4072 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4073 were not in it. We don't want to hold up all SMTP deliveries! Except when
4074 doing a two-stage queue run, don't do this if forcing. */
4075
4076 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4077 match_isinlist(addrlist->domain,
4078 (const uschar **)&queue_smtp_domains, 0,
4079 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4080 {
4081 expired = FALSE;
4082 for (addr = addrlist; addr; addr = addr->next)
4083 if (addr->transport_return == DEFER)
4084 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4085 continue; /* With next host */
4086 }
4087
4088 /* Count hosts being considered - purely for an intelligent comment
4089 if none are usable. */
4090
4091 hosts_total++;
4092
4093 /* Set $host and $host address now in case they are needed for the
4094 interface expansion or the serialize_hosts check; they remain set if an
4095 actual delivery happens. */
4096
4097 deliver_host = host->name;
4098 deliver_host_address = host->address;
4099 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4100 : host->dnssec == DS_NO ? US"no"
4101 : US"";
4102
4103 /* Set up a string for adding to the retry key if the port number is not
4104 the standard SMTP port. A host may have its own port setting that overrides
4105 the default. */
4106
4107 pistring = string_sprintf(":%d", host->port == PORT_NONE
4108 ? defport : host->port);
4109 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4110
4111 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4112 string is set, even if constant (as different transports can have different
4113 constant settings), we must add it to the key that is used for retries,
4114 because connections to the same host from a different interface should be
4115 treated separately. */
4116
4117 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4118 if ((rs = ob->interface) && *rs)
4119 {
4120 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4121 return FALSE;
4122 pistring = string_sprintf("%s/%s", pistring, interface);
4123 }
4124
4125 /* The first time round the outer loop, check the status of the host by
4126 inspecting the retry data. The second time round, we are interested only
4127 in expired hosts that haven't been tried since this message arrived. */
4128
4129 if (cutoff_retry == 0)
4130 {
4131 BOOL incl_ip;
4132 /* Ensure the status of the address is set by checking retry data if
4133 necessary. There may be host-specific retry data (applicable to all
4134 messages) and also data for retries of a specific message at this host.
4135 If either of these retry records are actually read, the keys used are
4136 returned to save recomputing them later. */
4137
4138 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4139 US"retry_include_ip_address", ob->retry_include_ip_address,
4140 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4141 continue; /* with next host */
4142
4143 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4144 incl_ip, &retry_host_key, &retry_message_key);
4145
4146 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4147 (host->address == NULL)? US"" : host->address, pistring,
4148 (host->status == hstatus_usable)? "usable" :
4149 (host->status == hstatus_unusable)? "unusable" :
4150 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4151
4152 /* Skip this address if not usable at this time, noting if it wasn't
4153 actually expired, both locally and in the address. */
4154
4155 switch (host->status)
4156 {
4157 case hstatus_unusable:
4158 expired = FALSE;
4159 setflag(addrlist, af_retry_skipped);
4160 /* Fall through */
4161
4162 case hstatus_unusable_expired:
4163 switch (host->why)
4164 {
4165 case hwhy_retry: hosts_retry++; break;
4166 case hwhy_failed: hosts_fail++; break;
4167 case hwhy_insecure:
4168 case hwhy_deferred: hosts_defer++; break;
4169 }
4170
4171 /* If there was a retry message key, implying that previously there
4172 was a message-specific defer, we don't want to update the list of
4173 messages waiting for these hosts. */
4174
4175 if (retry_message_key) update_waiting = FALSE;
4176 continue; /* With the next host or IP address */
4177 }
4178 }
4179
4180 /* Second time round the loop: if the address is set but expired, and
4181 the message is newer than the last try, let it through. */
4182
4183 else
4184 {
4185 if ( !host->address
4186 || host->status != hstatus_unusable_expired
4187 || host->last_try > received_time.tv_sec)
4188 continue;
4189 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4190 host->name, host->address, pistring);
4191 host_is_expired = TRUE;
4192 }
4193
4194 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4195 it remains TRUE only if all hosts are expired and none are actually tried.
4196 */
4197
4198 expired = FALSE;
4199
4200 /* If this host is listed as one to which access must be serialized,
4201 see if another Exim process has a connection to it, and if so, skip
4202 this host. If not, update the database to record our connection to it
4203 and remember this for later deletion. Do not do any of this if we are
4204 sending the message down a pre-existing connection. */
4205
4206 if ( !continue_hostname
4207 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4208 {
4209 serialize_key = string_sprintf("host-serialize-%s", host->name);
4210 if (!enq_start(serialize_key, 1))
4211 {
4212 DEBUG(D_transport)
4213 debug_printf("skipping host %s because another Exim process "
4214 "is connected to it\n", host->name);
4215 hosts_serial++;
4216 continue;
4217 }
4218 }
4219
4220 /* OK, we have an IP address that is not waiting for its retry time to
4221 arrive (it might be expired) OR (second time round the loop) we have an
4222 expired host that hasn't been tried since the message arrived. Have a go
4223 at delivering the message to it. First prepare the addresses by flushing
4224 out the result of previous attempts, and finding the first address that
4225 is still to be delivered. */
4226
4227 first_addr = prepare_addresses(addrlist, host);
4228
4229 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4230 message_id, host->name, host->address, addrlist->address,
4231 addrlist->next ? ", ..." : "");
4232
4233 set_process_info("delivering %s to %s [%s] (%s%s)",
4234 message_id, host->name, host->address, addrlist->address,
4235 addrlist->next ? ", ..." : "");
4236
4237 /* This is not for real; don't do the delivery. If there are
4238 any remaining hosts, list them. */
4239
4240 if (dont_deliver)
4241 {
4242 host_item *host2;
4243 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4244 for (addr = addrlist; addr; addr = addr->next)
4245 {
4246 addr->host_used = host;
4247 addr->special_action = '*';
4248 addr->message = US"delivery bypassed by -N option";
4249 }
4250 DEBUG(D_transport)
4251 {
4252 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4253 "*** host and remaining hosts:\n", tblock->name);
4254 for (host2 = host; host2; host2 = host2->next)
4255 debug_printf(" %s [%s]\n", host2->name,
4256 host2->address ? host2->address : US"unset");
4257 }
4258 rc = OK;
4259 }
4260
4261 /* This is for real. If the host is expired, we don't count it for
4262 hosts_max_retry. This ensures that all hosts must expire before an address
4263 is timed out, unless hosts_max_try_hardlimit (which protects against
4264 lunatic DNS configurations) is reached.
4265
4266 If the host is not expired and we are about to hit the hosts_max_retry
4267 limit, check to see if there is a subsequent hosts with a different MX
4268 value. If so, make that the next host, and don't count this one. This is a
4269 heuristic to make sure that different MXs do get tried. With a normal kind
4270 of retry rule, they would get tried anyway when the earlier hosts were
4271 delayed, but if the domain has a "retry every time" type of rule - as is
4272 often used for the the very large ISPs, that won't happen. */
4273
4274 else
4275 {
4276 host_item * thost;
4277 /* Make a copy of the host if it is local to this invocation
4278 of the transport. */
4279
4280 if (expanded_hosts)
4281 {
4282 thost = store_get(sizeof(host_item));
4283 *thost = *host;
4284 thost->name = string_copy(host->name);
4285 thost->address = string_copy(host->address);
4286 }
4287 else
4288 thost = host;
4289
4290 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4291 {
4292 host_item *h;
4293 DEBUG(D_transport)
4294 debug_printf("hosts_max_try limit reached with this host\n");
4295 for (h = host; h; h = h->next) if (h->mx != host->mx)
4296 {
4297 nexthost = h;
4298 unexpired_hosts_tried--;
4299 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4300 "and will be tried\n");
4301 break;
4302 }
4303 }
4304
4305 /* Attempt the delivery. */
4306
4307 total_hosts_tried++;
4308 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4309 &message_defer, FALSE);
4310
4311 /* Yield is one of:
4312 OK => connection made, each address contains its result;
4313 message_defer is set for message-specific defers (when all
4314 recipients are marked defer)
4315 DEFER => there was a non-message-specific delivery problem;
4316 ERROR => there was a problem setting up the arguments for a filter,
4317 or there was a problem with expanding added headers
4318 */
4319
4320 /* If the result is not OK, there was a non-message-specific problem.
4321 If the result is DEFER, we need to write to the logs saying what happened
4322 for this particular host, except in the case of authentication and TLS
4323 failures, where the log has already been written. If all hosts defer a
4324 general message is written at the end. */
4325
4326 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4327 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4328 write_logs(first_addr, host);
4329
4330 #ifndef DISABLE_EVENT
4331 if (rc == DEFER)
4332 deferred_event_raise(first_addr, host);
4333 #endif
4334
4335 /* If STARTTLS was accepted, but there was a failure in setting up the
4336 TLS session (usually a certificate screwup), and the host is not in
4337 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4338 TLS forcibly turned off. We have to start from scratch with a new SMTP
4339 connection. That's why the retry is done from here, not from within
4340 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4341 session, so the in-clear transmission after those errors, if permitted,
4342 happens inside smtp_deliver().] */
4343
4344 #ifdef SUPPORT_TLS
4345 if ( rc == DEFER
4346 && first_addr->basic_errno == ERRNO_TLSFAILURE
4347 && ob->tls_tempfail_tryclear
4348 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4349 )
4350 {
4351 log_write(0, LOG_MAIN,
4352 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4353 first_addr->message, host->name, host->address);
4354 first_addr = prepare_addresses(addrlist, host);
4355 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4356 &message_defer, TRUE);
4357 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4358 write_logs(first_addr, host);
4359 # ifndef DISABLE_EVENT
4360 if (rc == DEFER)
4361 deferred_event_raise(first_addr, host);
4362 # endif
4363 }
4364 #endif /*SUPPORT_TLS*/
4365 }
4366
4367 /* Delivery attempt finished */
4368
4369 rs = rc == OK ? US"OK"
4370 : rc == DEFER ? US"DEFER"
4371 : rc == ERROR ? US"ERROR"
4372 : US"?";
4373
4374 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4375 message_id, host->name, host->address, addrlist->address,
4376 addrlist->next ? " (& others)" : "", rs);
4377
4378 /* Release serialization if set up */
4379
4380 if (serialize_key) enq_end(serialize_key);
4381
4382 /* If the result is DEFER, or if a host retry record is known to exist, we
4383 need to add an item to the retry chain for updating the retry database
4384 at the end of delivery. We only need to add the item to the top address,
4385 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4386 for any other delivery attempts using the same address. (It is copied into
4387 the unusable tree at the outer level, so even if different address blocks
4388 contain the same address, it still won't get tried again.) */
4389
4390 if (rc == DEFER || retry_host_key)
4391 {
4392 int delete_flag = rc != DEFER ? rf_delete : 0;
4393 if (!retry_host_key)
4394 {
4395 BOOL incl_ip;
4396 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4397 US"retry_include_ip_address", ob->retry_include_ip_address,
4398 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4399 incl_ip = TRUE; /* error; use most-specific retry record */
4400
4401 retry_host_key = incl_ip
4402 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4403 : string_sprintf("T:%S%s", host->name, pistring);
4404 }
4405
4406 /* If a delivery of another message over an existing SMTP connection
4407 yields DEFER, we do NOT set up retry data for the host. This covers the
4408 case when there are delays in routing the addresses in the second message
4409 that are so long that the server times out. This is alleviated by not
4410 routing addresses that previously had routing defers when handling an
4411 existing connection, but even so, this case may occur (e.g. if a
4412 previously happily routed address starts giving routing defers). If the
4413 host is genuinely down, another non-continued message delivery will
4414 notice it soon enough. */
4415
4416 if (delete_flag != 0 || !continue_hostname)
4417 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4418
4419 /* We may have tried an expired host, if its retry time has come; ensure
4420 the status reflects the expiry for the benefit of any other addresses. */
4421
4422 if (rc == DEFER)
4423 {
4424 host->status = host_is_expired
4425 ? hstatus_unusable_expired : hstatus_unusable;
4426 host->why = hwhy_deferred;
4427 }
4428 }
4429
4430 /* If message_defer is set (host was OK, but every recipient got deferred
4431 because of some message-specific problem), or if that had happened
4432 previously so that a message retry key exists, add an appropriate item
4433 to the retry chain. Note that if there was a message defer but now there is
4434 a host defer, the message defer record gets deleted. That seems perfectly
4435 reasonable. Also, stop the message from being remembered as waiting
4436 for specific hosts. */
4437
4438 if (message_defer || retry_message_key)
4439 {
4440 int delete_flag = message_defer ? 0 : rf_delete;
4441 if (!retry_message_key)
4442 {
4443 BOOL incl_ip;
4444 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4445 US"retry_include_ip_address", ob->retry_include_ip_address,
4446 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4447 incl_ip = TRUE; /* error; use most-specific retry record */
4448
4449 retry_message_key = incl_ip
4450 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4451 message_id)
4452 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4453 }
4454 retry_add_item(addrlist, retry_message_key,
4455 rf_message | rf_host | delete_flag);
4456 update_waiting = FALSE;
4457 }
4458
4459 /* Any return other than DEFER (that is, OK or ERROR) means that the
4460 addresses have got their final statuses filled in for this host. In the OK
4461 case, see if any of them are deferred. */
4462
4463 if (rc == OK)
4464 for (addr = addrlist; addr; addr = addr->next)
4465 if (addr->transport_return == DEFER)
4466 {
4467 some_deferred = TRUE;
4468 break;
4469 }
4470
4471 /* If no addresses deferred or the result was ERROR, return. We do this for
4472 ERROR because a failing filter set-up or add_headers expansion is likely to
4473 fail for any host we try. */
4474
4475 if (rc == ERROR || (rc == OK && !some_deferred))
4476 {
4477 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4478 return TRUE; /* Each address has its status */
4479 }
4480
4481 /* If the result was DEFER or some individual addresses deferred, let
4482 the loop run to try other hosts with the deferred addresses, except for the
4483 case when we were trying to deliver down an existing channel and failed.
4484 Don't try any other hosts in this case. */
4485
4486 if (continue_hostname) break;
4487
4488 /* If the whole delivery, or some individual addresses, were deferred and
4489 there are more hosts that could be tried, do not count this host towards
4490 the hosts_max_try limit if the age of the message is greater than the
4491 maximum retry time for this host. This means we may try try all hosts,
4492 ignoring the limit, when messages have been around for some time. This is
4493 important because if we don't try all hosts, the address will never time
4494 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4495
4496 if ((rc == DEFER || some_deferred) && nexthost)
4497 {
4498 BOOL timedout;
4499 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4500
4501 if (retry && retry->rules)
4502 {
4503 retry_rule *last_rule;
4504 for (last_rule = retry->rules;
4505 last_rule->next;
4506 last_rule = last_rule->next);
4507 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4508 }
4509 else timedout = TRUE; /* No rule => timed out */
4510
4511 if (timedout)
4512 {
4513 unexpired_hosts_tried--;
4514 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4515 "hosts_max_try (message older than host's retry time)\n");
4516 }
4517 }
4518 } /* End of loop for trying multiple hosts. */
4519
4520 /* This is the end of the loop that repeats iff expired is TRUE and
4521 ob->delay_after_cutoff is FALSE. The second time round we will
4522 try those hosts that haven't been tried since the message arrived. */
4523
4524 DEBUG(D_transport)
4525 {
4526 debug_printf("all IP addresses skipped or deferred at least one address\n");
4527 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4528 debug_printf("retrying IP addresses not tried since message arrived\n");
4529 }
4530 }
4531
4532
4533 /* Get here if all IP addresses are skipped or defer at least one address. In
4534 MUA wrapper mode, this will happen only for connection or other non-message-
4535 specific failures. Force the delivery status for all addresses to FAIL. */
4536
4537 if (mua_wrapper)
4538 {
4539 for (addr = addrlist; addr; addr = addr->next)
4540 addr->transport_return = FAIL;
4541 goto END_TRANSPORT;
4542 }
4543
4544 /* In the normal, non-wrapper case, add a standard message to each deferred
4545 address if there hasn't been an error, that is, if it hasn't actually been
4546 tried this time. The variable "expired" will be FALSE if any deliveries were
4547 actually tried, or if there was at least one host that was not expired. That
4548 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4549 a delivery has been tried, an error code will be set, and the failing of the
4550 message is handled by the retry code later.
4551
4552 If queue_smtp is set, or this transport was called to send a subsequent message
4553 down an existing TCP/IP connection, and something caused the host not to be
4554 found, we end up here, but can detect these cases and handle them specially. */
4555
4556 for (addr = addrlist; addr; addr = addr->next)
4557 {
4558 /* If host is not NULL, it means that we stopped processing the host list
4559 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4560 means we need to behave as if some hosts were skipped because their retry
4561 time had not come. Specifically, this prevents the address from timing out.
4562 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4563 hosts were tried. */
4564
4565 if (host)
4566 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4567 {
4568 DEBUG(D_transport)
4569 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4570 "hosts were tried\n");
4571 }
4572 else
4573 {
4574 DEBUG(D_transport)
4575 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4576 setflag(addr, af_retry_skipped);
4577 }
4578
4579 if (queue_smtp) /* no deliveries attempted */
4580 {
4581 addr->transport_return = DEFER;
4582 addr->basic_errno = 0;
4583 addr->message = US"SMTP delivery explicitly queued";
4584 }
4585
4586 else if ( addr->transport_return == DEFER
4587 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4588 && !addr->message
4589 )
4590 {
4591 addr->basic_errno = ERRNO_HRETRY;
4592 if (continue_hostname)
4593 addr->message = US"no host found for existing SMTP connection";
4594 else if (expired)
4595 {
4596 setflag(addr, af_pass_message); /* This is not a security risk */
4597 addr->message = string_sprintf(
4598 "all hosts%s have been failing for a long time %s",
4599 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4600 ob->delay_after_cutoff
4601 ? US"(and retry time not reached)"
4602 : US"and were last tried after this message arrived");
4603
4604 /* If we are already using fallback hosts, or there are no fallback hosts
4605 defined, convert the result to FAIL to cause a bounce. */
4606
4607 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4608 addr->transport_return = FAIL;
4609 }
4610 else
4611 {
4612 const char * s;
4613 if (hosts_retry == hosts_total)
4614 s = "retry time not reached for any host%s";
4615 else if (hosts_fail == hosts_total)
4616 s = "all host address lookups%s failed permanently";
4617 else if (hosts_defer == hosts_total)
4618 s = "all host address lookups%s failed temporarily";
4619 else if (hosts_serial == hosts_total)
4620 s = "connection limit reached for all hosts%s";
4621 else if (hosts_fail+hosts_defer == hosts_total)
4622 s = "all host address lookups%s failed";
4623 else
4624 s = "some host address lookups failed and retry time "
4625 "not reached for other hosts or connection limit reached%s";
4626
4627 addr->message = string_sprintf(s,
4628 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4629 }
4630 }
4631 }
4632
4633 /* Update the database which keeps information about which messages are waiting
4634 for which hosts to become available. For some message-specific errors, the
4635 update_waiting flag is turned off because we don't want follow-on deliveries in
4636 those cases. If this transport instance is explicitly limited to one message
4637 per connection then follow-on deliveries are not possible and there's no need
4638 to create/update the per-transport wait-<transport_name> database. */
4639
4640 if (update_waiting && tblock->connection_max_messages != 1)
4641 transport_update_waiting(hostlist, tblock->name);
4642
4643 END_TRANSPORT:
4644
4645 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4646
4647 return TRUE; /* Each address has its status */
4648 }
4649
4650 #endif /*!MACRO_PREDEF*/
4651 /* vi: aw ai sw=2
4652 */
4653 /* End of transport/smtp.c */
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