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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 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 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
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 /* This label is jumped to directly when a TLS negotiation has failed,
2180 or was not done for a host for which it is required. Values will be set
2181 in message and errno, and setting_up will always be true. Treat as
2182 a temporary error. */
2183
2184 EHLOHELO_FAILED:
2185 code = '4';
2186 message = string_sprintf("Remote host closed connection in response to %s"
2187 " (EHLO response was: %s)", smtp_command, sx->buffer);
2188 sx->send_quit = FALSE;
2189 goto FAILED;
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 Use the given buffer as a staging area, and select on both the given fd
2584 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2585 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2586 under a timeout.
2587
2588 Arguments:
2589 buf space to use for buffering
2590 bufsiz size of buffer
2591 proxy_fd comms to proxied process
2592 timeout per-read timeout, seconds
2593 */
2594
2595 void
2596 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2597 {
2598 fd_set rfds, efds;
2599 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2600 int rc, i, fd_bits, nbytes;
2601
2602 set_process_info("proxying TLS connection for continued transport");
2603 FD_ZERO(&rfds);
2604 FD_SET(tls_out.active, &rfds);
2605 FD_SET(proxy_fd, &rfds);
2606
2607 for (fd_bits = 3; fd_bits; )
2608 {
2609 time_t time_left = timeout;
2610 time_t time_start = time(NULL);
2611
2612 /* wait for data */
2613 efds = rfds;
2614 do
2615 {
2616 struct timeval tv = { time_left, 0 };
2617
2618 rc = select(max_fd,
2619 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2620
2621 if (rc < 0 && errno == EINTR)
2622 if ((time_left -= time(NULL) - time_start) > 0) continue;
2623
2624 if (rc <= 0)
2625 {
2626 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2627 return;
2628 }
2629
2630 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2631 {
2632 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2633 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2634 return;
2635 }
2636 }
2637 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2638
2639 /* handle inbound data */
2640 if (FD_ISSET(tls_out.active, &rfds))
2641 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2642 {
2643 fd_bits &= ~1;
2644 FD_CLR(tls_out.active, &rfds);
2645 shutdown(proxy_fd, SHUT_WR);
2646 timeout = 5;
2647 }
2648 else
2649 {
2650 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2651 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2652 }
2653 else if (fd_bits & 1)
2654 FD_SET(tls_out.active, &rfds);
2655
2656 /* handle outbound data */
2657 if (FD_ISSET(proxy_fd, &rfds))
2658 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2659 {
2660 fd_bits = 0;
2661 tls_close(FALSE, TRUE);
2662 }
2663 else
2664 {
2665 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2666 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2667 return;
2668 }
2669 else if (fd_bits & 2)
2670 FD_SET(proxy_fd, &rfds);
2671 }
2672 }
2673 #endif
2674
2675
2676 /*************************************************
2677 * Deliver address list to given host *
2678 *************************************************/
2679
2680 /* If continue_hostname is not null, we get here only when continuing to
2681 deliver down an existing channel. The channel was passed as the standard
2682 input. TLS is never active on a passed channel; the previous process always
2683 closes it down before passing the connection on.
2684
2685 Otherwise, we have to make a connection to the remote host, and do the
2686 initial protocol exchange.
2687
2688 When running as an MUA wrapper, if the sender or any recipient is rejected,
2689 temporarily or permanently, we force failure for all recipients.
2690
2691 Arguments:
2692 addrlist chain of potential addresses to deliver; only those whose
2693 transport_return field is set to PENDING_DEFER are currently
2694 being processed; others should be skipped - they have either
2695 been delivered to an earlier host or IP address, or been
2696 failed by one of them.
2697 host host to deliver to
2698 host_af AF_INET or AF_INET6
2699 defport default TCP/IP port to use if host does not specify, in host
2700 byte order
2701 interface interface to bind to, or NULL
2702 tblock transport instance block
2703 message_defer set TRUE if yield is OK, but all addresses were deferred
2704 because of a non-recipient, non-host failure, that is, a
2705 4xx response to MAIL FROM, DATA, or ".". This is a defer
2706 that is specific to the message.
2707 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2708 a second attempt after TLS initialization fails
2709
2710 Returns: OK - the connection was made and the delivery attempted;
2711 the result for each address is in its data block.
2712 DEFER - the connection could not be made, or something failed
2713 while setting up the SMTP session, or there was a
2714 non-message-specific error, such as a timeout.
2715 ERROR - a filter command is specified for this transport,
2716 and there was a problem setting it up; OR helo_data
2717 or add_headers or authenticated_sender is specified
2718 for this transport, and the string failed to expand
2719 */
2720
2721 static int
2722 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2723 uschar *interface, transport_instance *tblock,
2724 BOOL *message_defer, BOOL suppress_tls)
2725 {
2726 address_item *addr;
2727 int yield = OK;
2728 int save_errno;
2729 int rc;
2730 struct timeval start_delivery_time;
2731
2732 BOOL pass_message = FALSE;
2733 uschar *message = NULL;
2734 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2735
2736 smtp_context sx;
2737
2738 gettimeofday(&start_delivery_time, NULL);
2739 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2740 *message_defer = FALSE;
2741
2742 sx.addrlist = addrlist;
2743 sx.host = host;
2744 sx.host_af = host_af,
2745 sx.port = defport;
2746 sx.interface = interface;
2747 sx.helo_data = NULL;
2748 sx.tblock = tblock;
2749 sx.verify = FALSE;
2750
2751 /* Get the channel set up ready for a message (MAIL FROM being the next
2752 SMTP command to send */
2753
2754 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2755 return rc;
2756
2757 /* If there is a filter command specified for this transport, we can now
2758 set it up. This cannot be done until the identify of the host is known. */
2759
2760 if (tblock->filter_command)
2761 {
2762 transport_filter_timeout = tblock->filter_timeout;
2763
2764 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2765 yield ERROR. */
2766
2767 if (!transport_set_up_command(&transport_filter_argv,
2768 tblock->filter_command, TRUE, DEFER, addrlist,
2769 string_sprintf("%.50s transport", tblock->name), NULL))
2770 {
2771 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2772 FALSE);
2773 yield = ERROR;
2774 goto SEND_QUIT;
2775 }
2776
2777 if ( transport_filter_argv
2778 && *transport_filter_argv
2779 && **transport_filter_argv
2780 && sx.peer_offered & OPTION_CHUNKING
2781 )
2782 {
2783 sx.peer_offered &= ~OPTION_CHUNKING;
2784 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2785 }
2786 }
2787
2788 sx.first_addr = addrlist;
2789
2790 /* For messages that have more than the maximum number of envelope recipients,
2791 we want to send several transactions down the same SMTP connection. (See
2792 comments in deliver.c as to how this reconciles, heuristically, with
2793 remote_max_parallel.) This optimization was added to Exim after the following
2794 code was already working. The simplest way to put it in without disturbing the
2795 code was to use a goto to jump back to this point when there is another
2796 transaction to handle. */
2797
2798 SEND_MESSAGE:
2799 sx.from_addr = return_path;
2800 sx.sync_addr = sx.first_addr;
2801 sx.ok = FALSE;
2802 sx.send_rset = TRUE;
2803 sx.completed_addr = FALSE;
2804
2805
2806 /* If we are a continued-connection-after-verify the MAIL and RCPT
2807 commands were already sent; do not re-send but do mark the addrs as
2808 having been accepted up to RCPT stage. A traditional cont-conn
2809 always has a sequence number greater than one. */
2810
2811 if (continue_hostname && continue_sequence == 1)
2812 {
2813 address_item * addr;
2814
2815 sx.peer_offered = smtp_peer_options;
2816 sx.pending_MAIL = FALSE;
2817 sx.ok = TRUE;
2818 sx.next_addr = NULL;
2819
2820 for (addr = addrlist; addr; addr = addr->next)
2821 addr->transport_return = PENDING_OK;
2822 }
2823 else
2824 {
2825 /* Initiate a message transfer. */
2826
2827 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2828 {
2829 case 0: break;
2830 case -1: case -2: goto RESPONSE_FAILED;
2831 case -3: goto END_OFF;
2832 case -4: goto SEND_QUIT;
2833 default: goto SEND_FAILED;
2834 }
2835
2836 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2837 permanently or temporarily. We should have flushed and synced after the last
2838 RCPT. */
2839
2840 if (mua_wrapper)
2841 {
2842 address_item * a;
2843 unsigned cnt;
2844
2845 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2846 if (a->transport_return != PENDING_OK)
2847 {
2848 /*XXX could we find a better errno than 0 here? */
2849 set_errno_nohost(addrlist, 0, a->message, FAIL,
2850 testflag(a, af_pass_message));
2851 sx.ok = FALSE;
2852 break;
2853 }
2854 }
2855 }
2856
2857 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2858 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2859 have a good recipient buffered up if we are pipelining. We don't want to waste
2860 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2861 are pipelining. The responses are all handled by sync_responses().
2862 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2863 to send is. */
2864
2865 if ( !(sx.peer_offered & OPTION_CHUNKING)
2866 && (sx.ok || (pipelining_active && !mua_wrapper)))
2867 {
2868 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2869
2870 if (count < 0) goto SEND_FAILED;
2871 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2872 {
2873 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2874 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2875 break;
2876
2877 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2878 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2879 case 0: break; /* No 2xx or 5xx, but no probs */
2880
2881 case -1: goto END_OFF; /* Timeout on RCPT */
2882 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2883 }
2884 pipelining_active = FALSE;
2885 data_command = string_copy(big_buffer); /* Save for later error message */
2886 }
2887
2888 /* If there were no good recipients (but otherwise there have been no
2889 problems), just set ok TRUE, since we have handled address-specific errors
2890 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2891 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2892 well as body. Set the appropriate timeout value to be used for each chunk.
2893 (Haven't been able to make it work using select() for writing yet.) */
2894
2895 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2896 {
2897 /* Save the first address of the next batch. */
2898 sx.first_addr = sx.next_addr;
2899
2900 sx.ok = TRUE;
2901 }
2902 else
2903 {
2904 transport_ctx tctx = {
2905 {sx.inblock.sock},
2906 tblock,
2907 addrlist,
2908 US".", US"..", /* Escaping strings */
2909 topt_use_crlf | topt_escape_headers
2910 | (tblock->body_only ? topt_no_headers : 0)
2911 | (tblock->headers_only ? topt_no_body : 0)
2912 | (tblock->return_path_add ? topt_add_return_path : 0)
2913 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2914 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2915 };
2916
2917 /* If using CHUNKING we need a callback from the generic transport
2918 support to us, for the sending of BDAT smtp commands and the reaping
2919 of responses. The callback needs a whole bunch of state so set up
2920 a transport-context structure to be passed around. */
2921
2922 if (sx.peer_offered & OPTION_CHUNKING)
2923 {
2924 tctx.check_string = tctx.escape_string = NULL;
2925 tctx.options |= topt_use_bdat;
2926 tctx.chunk_cb = smtp_chunk_cmd_callback;
2927 sx.pending_BDAT = FALSE;
2928 sx.good_RCPT = sx.ok;
2929 sx.cmd_count = 0;
2930 tctx.smtp_context = &sx;
2931 }
2932 else
2933 tctx.options |= topt_end_dot;
2934
2935 /* Save the first address of the next batch. */
2936 sx.first_addr = sx.next_addr;
2937
2938 /* Responses from CHUNKING commands go in buffer. Otherwise,
2939 there has not been a response. */
2940
2941 sx.buffer[0] = 0;
2942
2943 sigalrm_seen = FALSE;
2944 transport_write_timeout = sx.ob->data_timeout;
2945 smtp_command = US"sending data block"; /* For error messages */
2946 DEBUG(D_transport|D_v)
2947 if (sx.peer_offered & OPTION_CHUNKING)
2948 debug_printf(" will write message using CHUNKING\n");
2949 else
2950 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2951 transport_count = 0;
2952
2953 #ifndef DISABLE_DKIM
2954 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2955 #else
2956 sx.ok = transport_write_message(&tctx, 0);
2957 #endif
2958
2959 /* transport_write_message() uses write() because it is called from other
2960 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2961 it can exit with "Broken pipe" as its error. This really means that the
2962 socket got closed at the far end. */
2963
2964 transport_write_timeout = 0; /* for subsequent transports */
2965
2966 /* Failure can either be some kind of I/O disaster (including timeout),
2967 or the failure of a transport filter or the expansion of added headers.
2968 Or, when CHUNKING, it can be a protocol-detected failure. */
2969
2970 if (!sx.ok)
2971 if (message) goto SEND_FAILED;
2972 else goto RESPONSE_FAILED;
2973
2974 /* We used to send the terminating "." explicitly here, but because of
2975 buffering effects at both ends of TCP/IP connections, you don't gain
2976 anything by keeping it separate, so it might as well go in the final
2977 data buffer for efficiency. This is now done by setting the topt_end_dot
2978 flag above. */
2979
2980 smtp_command = US"end of data";
2981
2982 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2983 {
2984 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2985 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2986 {
2987 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2988 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2989 break;
2990
2991 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2992 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2993 case 0: break; /* No 2xx or 5xx, but no probs */
2994
2995 case -1: goto END_OFF; /* Timeout on RCPT */
2996 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2997 }
2998 }
2999
3000 #ifndef DISABLE_PRDR
3001 /* For PRDR we optionally get a partial-responses warning
3002 * followed by the individual responses, before going on with
3003 * the overall response. If we don't get the warning then deal
3004 * with per non-PRDR. */
3005 if(sx.prdr_active)
3006 {
3007 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3008 sx.ob->final_timeout);
3009 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3010 {
3011 case '2': sx.prdr_active = FALSE;
3012 sx.ok = TRUE;
3013 break;
3014 case '4': errno = ERRNO_DATA4XX;
3015 addrlist->more_errno |=
3016 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3017 break;
3018 }
3019 }
3020 else
3021 #endif
3022
3023 /* For non-PRDR SMTP, we now read a single response that applies to the
3024 whole message. If it is OK, then all the addresses have been delivered. */
3025
3026 if (!sx.lmtp)
3027 {
3028 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3029 sx.ob->final_timeout);
3030 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3031 {
3032 errno = ERRNO_DATA4XX;
3033 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3034 }
3035 }
3036
3037 /* For LMTP, we get back a response for every RCPT command that we sent;
3038 some may be accepted and some rejected. For those that get a response, their
3039 status is fixed; any that are accepted have been handed over, even if later
3040 responses crash - at least, that's how I read RFC 2033.
3041
3042 If all went well, mark the recipient addresses as completed, record which
3043 host/IPaddress they were delivered to, and cut out RSET when sending another
3044 message down the same channel. Write the completed addresses to the journal
3045 now so that they are recorded in case there is a crash of hardware or
3046 software before the spool gets updated. Also record the final SMTP
3047 confirmation if needed (for SMTP only). */
3048
3049 if (sx.ok)
3050 {
3051 int flag = '=';
3052 struct timeval delivery_time;
3053 int len;
3054 uschar * conf = NULL;
3055
3056 timesince(&delivery_time, &start_delivery_time);
3057 sx.send_rset = FALSE;
3058 pipelining_active = FALSE;
3059
3060 /* Set up confirmation if needed - applies only to SMTP */
3061
3062 if (
3063 #ifdef DISABLE_EVENT
3064 LOGGING(smtp_confirmation) &&
3065 #endif
3066 !sx.lmtp
3067 )
3068 {
3069 const uschar *s = string_printing(sx.buffer);
3070 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3071 conf = (s == sx.buffer)? US string_copy(s) : US s;
3072 }
3073
3074 /* Process all transported addresses - for LMTP or PRDR, read a status for
3075 each one. */
3076
3077 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3078 {
3079 if (addr->transport_return != PENDING_OK) continue;
3080
3081 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3082 remaining addresses. Otherwise, it's a return code for just the one
3083 address. For temporary errors, add a retry item for the address so that
3084 it doesn't get tried again too soon. */
3085
3086 #ifndef DISABLE_PRDR
3087 if (sx.lmtp || sx.prdr_active)
3088 #else
3089 if (sx.lmtp)
3090 #endif
3091 {
3092 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3093 sx.ob->final_timeout))
3094 {
3095 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3096 addr->message = string_sprintf(
3097 #ifndef DISABLE_PRDR
3098 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3099 #else
3100 "LMTP error after %s: %s",
3101 #endif
3102 data_command, string_printing(sx.buffer));
3103 setflag(addr, af_pass_message); /* Allow message to go to user */
3104 if (sx.buffer[0] == '5')
3105 addr->transport_return = FAIL;
3106 else
3107 {
3108 errno = ERRNO_DATA4XX;
3109 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3110 addr->transport_return = DEFER;
3111 #ifndef DISABLE_PRDR
3112 if (!sx.prdr_active)
3113 #endif
3114 retry_add_item(addr, addr->address_retry_key, 0);
3115 }
3116 continue;
3117 }
3118 sx.completed_addr = TRUE; /* NOW we can set this flag */
3119 if (LOGGING(smtp_confirmation))
3120 {
3121 const uschar *s = string_printing(sx.buffer);
3122 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3123 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3124 }
3125 }
3126
3127 /* SMTP, or success return from LMTP for this address. Pass back the
3128 actual host that was used. */
3129
3130 addr->transport_return = OK;
3131 addr->more_errno = delivery_time.tv_sec;
3132 addr->delivery_usec = delivery_time.tv_usec;
3133 addr->host_used = host;
3134 addr->special_action = flag;
3135 addr->message = conf;
3136 #ifndef DISABLE_PRDR
3137 if (sx.prdr_active) setflag(addr, af_prdr_used);
3138 #endif
3139 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3140 flag = '-';
3141
3142 #ifndef DISABLE_PRDR
3143 if (!sx.prdr_active)
3144 #endif
3145 {
3146 /* Update the journal. For homonymic addresses, use the base address plus
3147 the transport name. See lots of comments in deliver.c about the reasons
3148 for the complications when homonyms are involved. Just carry on after
3149 write error, as it may prove possible to update the spool file later. */
3150
3151 if (testflag(addr, af_homonym))
3152 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3153 else
3154 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3155
3156 DEBUG(D_deliver) debug_printf("S:journalling %s", sx.buffer);
3157 len = Ustrlen(CS sx.buffer);
3158 if (write(journal_fd, sx.buffer, len) != len)
3159 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3160 "%s: %s", sx.buffer, strerror(errno));
3161 }
3162 }
3163
3164 #ifndef DISABLE_PRDR
3165 if (sx.prdr_active)
3166 {
3167 /* PRDR - get the final, overall response. For any non-success
3168 upgrade all the address statuses. */
3169 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3170 sx.ob->final_timeout);
3171 if (!sx.ok)
3172 {
3173 if(errno == 0 && sx.buffer[0] == '4')
3174 {
3175 errno = ERRNO_DATA4XX;
3176 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3177 }
3178 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3179 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3180 addr->transport_return = PENDING_OK; /* allow set_errno action */
3181 goto RESPONSE_FAILED;
3182 }
3183
3184 /* Update the journal, or setup retry. */
3185 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3186 if (addr->transport_return == OK)
3187 {
3188 if (testflag(addr, af_homonym))
3189 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3190 else
3191 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3192
3193 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3194 len = Ustrlen(CS sx.buffer);
3195 if (write(journal_fd, sx.buffer, len) != len)
3196 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3197 "%s: %s", sx.buffer, strerror(errno));
3198 }
3199 else if (addr->transport_return == DEFER)
3200 retry_add_item(addr, addr->address_retry_key, -2);
3201 }
3202 #endif
3203
3204 /* Ensure the journal file is pushed out to disk. */
3205
3206 if (EXIMfsync(journal_fd) < 0)
3207 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3208 strerror(errno));
3209 }
3210 }
3211
3212
3213 /* Handle general (not specific to one address) failures here. The value of ok
3214 is used to skip over this code on the falling through case. A timeout causes a
3215 deferral. Other errors may defer or fail according to the response code, and
3216 may set up a special errno value, e.g. after connection chopped, which is
3217 assumed if errno == 0 and there is no text in the buffer. If control reaches
3218 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3219 the problem is not related to this specific message. */
3220
3221 if (!sx.ok)
3222 {
3223 int code, set_rc;
3224 uschar * set_message;
3225
3226 RESPONSE_FAILED:
3227 {
3228 save_errno = errno;
3229 message = NULL;
3230 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3231 sx.buffer, &code, &message, &pass_message);
3232 goto FAILED;
3233 }
3234
3235 SEND_FAILED:
3236 {
3237 save_errno = errno;
3238 code = '4';
3239 message = string_sprintf("send() to %s [%s] failed: %s",
3240 host->name, host->address, message ? message : US strerror(save_errno));
3241 sx.send_quit = FALSE;
3242 goto FAILED;
3243 }
3244
3245 FAILED:
3246 {
3247 BOOL message_error;
3248
3249 sx.ok = FALSE; /* For when reached by GOTO */
3250 set_message = message;
3251
3252 /* We want to handle timeouts after MAIL or "." and loss of connection after
3253 "." specially. They can indicate a problem with the sender address or with
3254 the contents of the message rather than a real error on the connection. These
3255 cases are treated in the same way as a 4xx response. This next bit of code
3256 does the classification. */
3257
3258 switch(save_errno)
3259 {
3260 case 0:
3261 case ERRNO_MAIL4XX:
3262 case ERRNO_DATA4XX:
3263 message_error = TRUE;
3264 break;
3265
3266 case ETIMEDOUT:
3267 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3268 Ustrncmp(smtp_command,"end ",4) == 0;
3269 break;
3270
3271 case ERRNO_SMTPCLOSED:
3272 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3273 break;
3274
3275 default:
3276 message_error = FALSE;
3277 break;
3278 }
3279
3280 /* Handle the cases that are treated as message errors. These are:
3281
3282 (a) negative response or timeout after MAIL
3283 (b) negative response after DATA
3284 (c) negative response or timeout or dropped connection after "."
3285 (d) utf8 support required and not offered
3286
3287 It won't be a negative response or timeout after RCPT, as that is dealt
3288 with separately above. The action in all cases is to set an appropriate
3289 error code for all the addresses, but to leave yield set to OK because the
3290 host itself has not failed. Of course, it might in practice have failed
3291 when we've had a timeout, but if so, we'll discover that at the next
3292 delivery attempt. For a temporary error, set the message_defer flag, and
3293 write to the logs for information if this is not the last host. The error
3294 for the last host will be logged as part of the address's log line. */
3295
3296 if (message_error)
3297 {
3298 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3299
3300 /* If there's an errno, the message contains just the identity of
3301 the host. */
3302
3303 if (code == '5')
3304 set_rc = FAIL;
3305 else /* Anything other than 5 is treated as temporary */
3306 {
3307 set_rc = DEFER;
3308 if (save_errno > 0)
3309 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3310 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3311 msglog_line(host, message);
3312 *message_defer = TRUE;
3313 }
3314 }
3315
3316 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3317 ".", or some other transportation error. We defer all addresses and yield
3318 DEFER, except for the case of failed add_headers expansion, or a transport
3319 filter failure, when the yield should be ERROR, to stop it trying other
3320 hosts. */
3321
3322 else
3323 {
3324 set_rc = DEFER;
3325 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3326 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3327 }
3328 }
3329
3330 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3331 #ifdef EXPERIMENTAL_DSN_INFO
3332 , sx.smtp_greeting, sx.helo_response
3333 #endif
3334 );
3335 }
3336
3337
3338 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3339 SMTP session tidily. However, if there were too many addresses to send in one
3340 message (indicated by first_addr being non-NULL) we want to carry on with the
3341 rest of them. Also, it is desirable to send more than one message down the SMTP
3342 connection if there are several waiting, provided we haven't already sent so
3343 many as to hit the configured limit. The function transport_check_waiting looks
3344 for a waiting message and returns its id. Then transport_pass_socket tries to
3345 set up a continued delivery by passing the socket on to another process. The
3346 variable send_rset is FALSE if a message has just been successfully transfered.
3347
3348 If we are already sending down a continued channel, there may be further
3349 addresses not yet delivered that are aimed at the same host, but which have not
3350 been passed in this run of the transport. In this case, continue_more will be
3351 true, and all we should do is send RSET if necessary, and return, leaving the
3352 channel open.
3353
3354 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3355 do not want to continue with other messages down the same channel, because that
3356 can lead to looping between two or more messages, all with the same,
3357 temporarily failing address(es). [The retry information isn't updated yet, so
3358 new processes keep on trying.] We probably also don't want to try more of this
3359 message's addresses either.
3360
3361 If we have started a TLS session, we have to end it before passing the
3362 connection to a new process. However, not all servers can handle this (Exim
3363 can), so we do not pass such a connection on if the host matches
3364 hosts_nopass_tls. */
3365
3366 DEBUG(D_transport)
3367 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3368 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3369 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3370
3371 if (sx.completed_addr && sx.ok && sx.send_quit)
3372 {
3373 BOOL more;
3374 smtp_compare_t t_compare;
3375
3376 t_compare.tblock = tblock;
3377 t_compare.current_sender_address = sender_address;
3378
3379 if ( sx.first_addr != NULL
3380 || continue_more
3381 || (
3382 #ifdef SUPPORT_TLS
3383 ( tls_out.active < 0 && !continue_proxy_cipher
3384 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3385 )
3386 &&
3387 #endif
3388 transport_check_waiting(tblock->name, host->name,
3389 tblock->connection_max_messages, new_message_id, &more,
3390 (oicf)smtp_are_same_identities, (void*)&t_compare)
3391 ) )
3392 {
3393 uschar *msg;
3394 BOOL pass_message;
3395
3396 if (sx.send_rset)
3397 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3398 {
3399 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3400 host->address, strerror(errno));
3401 sx.send_quit = FALSE;
3402 }
3403 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3404 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3405 {
3406 int code;
3407 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3408 &pass_message);
3409 if (!sx.send_quit)
3410 {
3411 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3412 host->name, host->address, msg);
3413 }
3414 }
3415
3416 /* Either RSET was not needed, or it succeeded */
3417
3418 if (sx.ok)
3419 {
3420 int pfd[2];
3421 int socket_fd = sx.inblock.sock;
3422
3423
3424 if (sx.first_addr != NULL) /* More addresses still to be sent */
3425 { /* in this run of the transport */
3426 continue_sequence++; /* Causes * in logging */
3427 goto SEND_MESSAGE;
3428 }
3429
3430 /* Unless caller said it already has more messages listed for this host,
3431 pass the connection on to a new Exim process (below, the call to
3432 transport_pass_socket). If the caller has more ready, just return with
3433 the connection still open. */
3434
3435 #ifdef SUPPORT_TLS
3436 if (tls_out.active >= 0)
3437 if ( continue_more
3438 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3439 {
3440 /* Before passing the socket on, or returning to caller with it still
3441 open, we must shut down TLS. Not all MTAs allow for the continuation
3442 of the SMTP session when TLS is shut down. We test for this by sending
3443 a new EHLO. If we don't get a good response, we don't attempt to pass
3444 the socket on. */
3445
3446 tls_close(FALSE, TRUE);
3447 smtp_peer_options = smtp_peer_options_wrap;
3448 sx.ok = !sx.smtps
3449 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3450 "EHLO %s\r\n", sx.helo_data) >= 0
3451 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3452 '2', sx.ob->command_timeout);
3453
3454 if (sx.ok && continue_more)
3455 return yield; /* More addresses for another run */
3456 }
3457 else
3458 {
3459 /* Set up a pipe for proxying TLS for the new transport process */
3460
3461 smtp_peer_options |= OPTION_TLS;
3462 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3463 socket_fd = pfd[1];
3464 else
3465 set_errno(sx.first_addr, errno, US"internal allocation problem",
3466 DEFER, FALSE, host
3467 # ifdef EXPERIMENTAL_DSN_INFO
3468 , sx.smtp_greeting, sx.helo_response
3469 # endif
3470 );
3471 }
3472 else
3473 #endif
3474 if (continue_more)
3475 return yield; /* More addresses for another run */
3476
3477 /* If the socket is successfully passed, we mustn't send QUIT (or
3478 indeed anything!) from here. */
3479
3480 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3481 propagate it from the initial
3482 */
3483 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3484 host->address, new_message_id, socket_fd))
3485 {
3486 sx.send_quit = FALSE;
3487
3488 /* If TLS is still active, we need to proxy it for the transport we
3489 just passed the baton to. Fork a child to to do it, and return to
3490 get logging done asap. Which way to place the work makes assumptions
3491 about post-fork prioritisation which may not hold on all platforms. */
3492 #ifdef SUPPORT_TLS
3493 if (tls_out.active >= 0)
3494 {
3495 int pid = fork();
3496 if (pid > 0) /* parent */
3497 {
3498 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3499 close(pfd[0]);
3500 waitpid(pid, NULL, 0);
3501 tls_close(FALSE, FALSE);
3502 (void)close(sx.inblock.sock);
3503 continue_transport = NULL;
3504 continue_hostname = NULL;
3505 return yield;
3506 }
3507 else if (pid == 0) /* child; fork again to disconnect totally */
3508 {
3509 close(pfd[1]);
3510 if ((pid = fork()))
3511 {
3512 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3513 _exit(pid < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3514 }
3515 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3516 if (running_in_test_harness) millisleep(100); /* let logging complete */
3517 exim_exit(0, US"TLS proxy");
3518 }
3519 }
3520 #endif
3521 }
3522 }
3523
3524 /* If RSET failed and there are addresses left, they get deferred. */
3525 else
3526 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3527 #ifdef EXPERIMENTAL_DSN_INFO
3528 , sx.smtp_greeting, sx.helo_response
3529 #endif
3530 );
3531 }
3532 }
3533
3534 /* End off tidily with QUIT unless the connection has died or the socket has
3535 been passed to another process. There has been discussion on the net about what
3536 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3537 to wait for a response, but on the other hand, there isn't anything one can do
3538 with an error response, other than log it. Exim used to do that. However,
3539 further discussion suggested that it is positively advantageous not to wait for
3540 the response, but to close the session immediately. This is supposed to move
3541 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3542 load from the server. (Hosts that are both servers and clients may not see much
3543 difference, of course.) Further discussion indicated that this was safe to do
3544 on Unix systems which have decent implementations of TCP/IP that leave the
3545 connection around for a while (TIME_WAIT) after the application has gone away.
3546 This enables the response sent by the server to be properly ACKed rather than
3547 timed out, as can happen on broken TCP/IP implementations on other OS.
3548
3549 This change is being made on 31-Jul-98. After over a year of trouble-free
3550 operation, the old commented-out code was removed on 17-Sep-99. */
3551
3552 SEND_QUIT:
3553 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3554
3555 END_OFF:
3556
3557 #ifdef SUPPORT_TLS
3558 tls_close(FALSE, TRUE);
3559 #endif
3560
3561 /* Close the socket, and return the appropriate value, first setting
3562 works because the NULL setting is passed back to the calling process, and
3563 remote_max_parallel is forced to 1 when delivering over an existing connection,
3564
3565 If all went well and continue_more is set, we shouldn't actually get here if
3566 there are further addresses, as the return above will be taken. However,
3567 writing RSET might have failed, or there may be other addresses whose hosts are
3568 specified in the transports, and therefore not visible at top level, in which
3569 case continue_more won't get set. */
3570
3571 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3572 if (sx.send_quit)
3573 {
3574 shutdown(sx.outblock.sock, SHUT_WR);
3575 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3576 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3577 rc--; /* drain socket */
3578 }
3579 (void)close(sx.inblock.sock);
3580
3581 #ifndef DISABLE_EVENT
3582 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3583 #endif
3584
3585 continue_transport = NULL;
3586 continue_hostname = NULL;
3587 return yield;
3588 }
3589
3590
3591
3592
3593 /*************************************************
3594 * Closedown entry point *
3595 *************************************************/
3596
3597 /* This function is called when exim is passed an open smtp channel
3598 from another incarnation, but the message which it has been asked
3599 to deliver no longer exists. The channel is on stdin.
3600
3601 We might do fancy things like looking for another message to send down
3602 the channel, but if the one we sought has gone, it has probably been
3603 delivered by some other process that itself will seek further messages,
3604 so just close down our connection.
3605
3606 Argument: pointer to the transport instance block
3607 Returns: nothing
3608 */
3609
3610 void
3611 smtp_transport_closedown(transport_instance *tblock)
3612 {
3613 smtp_transport_options_block *ob =
3614 (smtp_transport_options_block *)tblock->options_block;
3615 smtp_inblock inblock;
3616 smtp_outblock outblock;
3617 uschar buffer[256];
3618 uschar inbuffer[4096];
3619 uschar outbuffer[16];
3620
3621 inblock.sock = fileno(stdin);
3622 inblock.buffer = inbuffer;
3623 inblock.buffersize = sizeof(inbuffer);
3624 inblock.ptr = inbuffer;
3625 inblock.ptrend = inbuffer;
3626
3627 outblock.sock = inblock.sock;
3628 outblock.buffersize = sizeof(outbuffer);
3629 outblock.buffer = outbuffer;
3630 outblock.ptr = outbuffer;
3631 outblock.cmd_count = 0;
3632 outblock.authenticating = FALSE;
3633
3634 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3635 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3636 ob->command_timeout);
3637 (void)close(inblock.sock);
3638 }
3639
3640
3641
3642 /*************************************************
3643 * Prepare addresses for delivery *
3644 *************************************************/
3645
3646 /* This function is called to flush out error settings from previous delivery
3647 attempts to other hosts. It also records whether we got here via an MX record
3648 or not in the more_errno field of the address. We are interested only in
3649 addresses that are still marked DEFER - others may have got delivered to a
3650 previously considered IP address. Set their status to PENDING_DEFER to indicate
3651 which ones are relevant this time.
3652
3653 Arguments:
3654 addrlist the list of addresses
3655 host the host we are delivering to
3656
3657 Returns: the first address for this delivery
3658 */
3659
3660 static address_item *
3661 prepare_addresses(address_item *addrlist, host_item *host)
3662 {
3663 address_item *first_addr = NULL;
3664 address_item *addr;
3665 for (addr = addrlist; addr; addr = addr->next)
3666 if (addr->transport_return == DEFER)
3667 {
3668 if (!first_addr) first_addr = addr;
3669 addr->transport_return = PENDING_DEFER;
3670 addr->basic_errno = 0;
3671 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3672 addr->message = NULL;
3673 #ifdef SUPPORT_TLS
3674 addr->cipher = NULL;
3675 addr->ourcert = NULL;
3676 addr->peercert = NULL;
3677 addr->peerdn = NULL;
3678 addr->ocsp = OCSP_NOT_REQ;
3679 #endif
3680 #ifdef EXPERIMENTAL_DSN_INFO
3681 addr->smtp_greeting = NULL;
3682 addr->helo_response = NULL;
3683 #endif
3684 }
3685 return first_addr;
3686 }
3687
3688
3689
3690 /*************************************************
3691 * Main entry point *
3692 *************************************************/
3693
3694 /* See local README for interface details. As this is a remote transport, it is
3695 given a chain of addresses to be delivered in one connection, if possible. It
3696 always returns TRUE, indicating that each address has its own independent
3697 status set, except if there is a setting up problem, in which case it returns
3698 FALSE. */
3699
3700 BOOL
3701 smtp_transport_entry(
3702 transport_instance *tblock, /* data for this instantiation */
3703 address_item *addrlist) /* addresses we are working on */
3704 {
3705 int cutoff_retry;
3706 int defport;
3707 int hosts_defer = 0;
3708 int hosts_fail = 0;
3709 int hosts_looked_up = 0;
3710 int hosts_retry = 0;
3711 int hosts_serial = 0;
3712 int hosts_total = 0;
3713 int total_hosts_tried = 0;
3714 address_item *addr;
3715 BOOL expired = TRUE;
3716 uschar *expanded_hosts = NULL;
3717 uschar *pistring;
3718 uschar *tid = string_sprintf("%s transport", tblock->name);
3719 smtp_transport_options_block *ob =
3720 (smtp_transport_options_block *)(tblock->options_block);
3721 host_item *hostlist = addrlist->host_list;
3722 host_item *host = NULL;
3723
3724 DEBUG(D_transport)
3725 {
3726 debug_printf("%s transport entered\n", tblock->name);
3727 for (addr = addrlist; addr; addr = addr->next)
3728 debug_printf(" %s\n", addr->address);
3729 if (hostlist)
3730 {
3731 debug_printf("hostlist:\n");
3732 for (host = hostlist; host; host = host->next)
3733 debug_printf(" %s:%d\n", host->name, host->port);
3734 }
3735 if (continue_hostname)
3736 debug_printf("already connected to %s [%s] (on fd %d)\n",
3737 continue_hostname, continue_host_address,
3738 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3739 }
3740
3741 /* Set the flag requesting that these hosts be added to the waiting
3742 database if the delivery fails temporarily or if we are running with
3743 queue_smtp or a 2-stage queue run. This gets unset for certain
3744 kinds of error, typically those that are specific to the message. */
3745
3746 update_waiting = TRUE;
3747
3748 /* If a host list is not defined for the addresses - they must all have the
3749 same one in order to be passed to a single transport - or if the transport has
3750 a host list with hosts_override set, use the host list supplied with the
3751 transport. It is an error for this not to exist. */
3752
3753 if (!hostlist || (ob->hosts_override && ob->hosts))
3754 {
3755 if (!ob->hosts)
3756 {
3757 addrlist->message = string_sprintf("%s transport called with no hosts set",
3758 tblock->name);
3759 addrlist->transport_return = PANIC;
3760 return FALSE; /* Only top address has status */
3761 }
3762
3763 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3764 ob->hosts);
3765
3766 /* If the transport's host list contains no '$' characters, and we are not
3767 randomizing, it is fixed and therefore a chain of hosts can be built once
3768 and for all, and remembered for subsequent use by other calls to this
3769 transport. If, on the other hand, the host list does contain '$', or we are
3770 randomizing its order, we have to rebuild it each time. In the fixed case,
3771 as the hosts string will never be used again, it doesn't matter that we
3772 replace all the : characters with zeros. */
3773
3774 if (!ob->hostlist)
3775 {
3776 uschar *s = ob->hosts;
3777
3778 if (Ustrchr(s, '$') != NULL)
3779 {
3780 if (!(expanded_hosts = expand_string(s)))
3781 {
3782 addrlist->message = string_sprintf("failed to expand list of hosts "
3783 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3784 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3785 return FALSE; /* Only top address has status */
3786 }
3787 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3788 "\"%s\"\n", s, expanded_hosts);
3789 s = expanded_hosts;
3790 }
3791 else
3792 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3793
3794 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3795
3796 /* Check that the expansion yielded something useful. */
3797 if (!hostlist)
3798 {
3799 addrlist->message =
3800 string_sprintf("%s transport has empty hosts setting", tblock->name);
3801 addrlist->transport_return = PANIC;
3802 return FALSE; /* Only top address has status */
3803 }
3804
3805 /* If there was no expansion of hosts, save the host list for
3806 next time. */
3807
3808 if (!expanded_hosts) ob->hostlist = hostlist;
3809 }
3810
3811 /* This is not the first time this transport has been run in this delivery;
3812 the host list was built previously. */
3813
3814 else
3815 hostlist = ob->hostlist;
3816 }
3817
3818 /* The host list was supplied with the address. If hosts_randomize is set, we
3819 must sort it into a random order if it did not come from MX records and has not
3820 already been randomized (but don't bother if continuing down an existing
3821 connection). */
3822
3823 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3824 {
3825 host_item *newlist = NULL;
3826 while (hostlist)
3827 {
3828 host_item *h = hostlist;
3829 hostlist = hostlist->next;
3830
3831 h->sort_key = random_number(100);
3832
3833 if (!newlist)
3834 {
3835 h->next = NULL;
3836 newlist = h;
3837 }
3838 else if (h->sort_key < newlist->sort_key)
3839 {
3840 h->next = newlist;
3841 newlist = h;
3842 }
3843 else
3844 {
3845 host_item *hh = newlist;
3846 while (hh->next)
3847 {
3848 if (h->sort_key < hh->next->sort_key) break;
3849 hh = hh->next;
3850 }
3851 h->next = hh->next;
3852 hh->next = h;
3853 }
3854 }
3855
3856 hostlist = addrlist->host_list = newlist;
3857 }
3858
3859 /* Sort out the default port. */
3860
3861 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3862
3863 /* For each host-plus-IP-address on the list:
3864
3865 . If this is a continued delivery and the host isn't the one with the
3866 current connection, skip.
3867
3868 . If the status is unusable (i.e. previously failed or retry checked), skip.
3869
3870 . If no IP address set, get the address, either by turning the name into
3871 an address, calling gethostbyname if gethostbyname is on, or by calling
3872 the DNS. The DNS may yield multiple addresses, in which case insert the
3873 extra ones into the list.
3874
3875 . Get the retry data if not previously obtained for this address and set the
3876 field which remembers the state of this address. Skip if the retry time is
3877 not reached. If not, remember whether retry data was found. The retry string
3878 contains both the name and the IP address.
3879
3880 . Scan the list of addresses and mark those whose status is DEFER as
3881 PENDING_DEFER. These are the only ones that will be processed in this cycle
3882 of the hosts loop.
3883
3884 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3885 Some addresses may be successfully delivered, others may fail, and yet
3886 others may get temporary errors and so get marked DEFER.
3887
3888 . The return from the delivery attempt is OK if a connection was made and a
3889 valid SMTP dialogue was completed. Otherwise it is DEFER.
3890
3891 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3892
3893 . If fail to connect, or other defer state, add a retry item.
3894
3895 . If there are any addresses whose status is still DEFER, carry on to the
3896 next host/IPaddress, unless we have tried the number of hosts given
3897 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3898 there is some fancy logic for hosts_max_try that means its limit can be
3899 overstepped in some circumstances.
3900
3901 If we get to the end of the list, all hosts have deferred at least one address,
3902 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3903 delivery attempt to those hosts whose last try was before the arrival time of
3904 the current message. To cope with this, we have to go round the loop a second
3905 time. After that, set the status and error data for any addresses that haven't
3906 had it set already. */
3907
3908 for (cutoff_retry = 0;
3909 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3910 cutoff_retry++)
3911 {
3912 host_item *nexthost = NULL;
3913 int unexpired_hosts_tried = 0;
3914
3915 for (host = hostlist;
3916 host
3917 && unexpired_hosts_tried < ob->hosts_max_try
3918 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3919 host = nexthost)
3920 {
3921 int rc;
3922 int host_af;
3923 uschar *rs;
3924 BOOL host_is_expired = FALSE;
3925 BOOL message_defer = FALSE;
3926 BOOL some_deferred = FALSE;
3927 address_item *first_addr = NULL;
3928 uschar *interface = NULL;
3929 uschar *retry_host_key = NULL;
3930 uschar *retry_message_key = NULL;
3931 uschar *serialize_key = NULL;
3932
3933 /* Default next host is next host. :-) But this can vary if the
3934 hosts_max_try limit is hit (see below). It may also be reset if a host
3935 address is looked up here (in case the host was multihomed). */
3936
3937 nexthost = host->next;
3938
3939 /* If the address hasn't yet been obtained from the host name, look it up
3940 now, unless the host is already marked as unusable. If it is marked as
3941 unusable, it means that the router was unable to find its IP address (in
3942 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3943 the lookup failed last time. We don't get this far if *all* MX records
3944 point to non-existent hosts; that is treated as a hard error.
3945
3946 We can just skip this host entirely. When the hosts came from the router,
3947 the address will timeout based on the other host(s); when the address is
3948 looked up below, there is an explicit retry record added.
3949
3950 Note that we mustn't skip unusable hosts if the address is not unset; they
3951 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3952
3953 if (!host->address)
3954 {
3955 int new_port, flags;
3956 host_item *hh;
3957
3958 if (host->status >= hstatus_unusable)
3959 {
3960 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3961 host->name);
3962 continue;
3963 }
3964
3965 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3966
3967 /* The host name is permitted to have an attached port. Find it, and
3968 strip it from the name. Just remember it for now. */
3969
3970 new_port = host_item_get_port(host);
3971
3972 /* Count hosts looked up */
3973
3974 hosts_looked_up++;
3975
3976 /* Find by name if so configured, or if it's an IP address. We don't
3977 just copy the IP address, because we need the test-for-local to happen. */
3978
3979 flags = HOST_FIND_BY_A;
3980 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3981 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3982
3983 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3984 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3985 else
3986 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3987 &ob->dnssec, /* domains for request/require */
3988 NULL, NULL);
3989
3990 /* Update the host (and any additional blocks, resulting from
3991 multihoming) with a host-specific port, if any. */
3992
3993 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3994
3995 /* Failure to find the host at this time (usually DNS temporary failure)
3996 is really a kind of routing failure rather than a transport failure.
3997 Therefore we add a retry item of the routing kind, not to stop us trying
3998 to look this name up here again, but to ensure the address gets timed
3999 out if the failures go on long enough. A complete failure at this point
4000 commonly points to a configuration error, but the best action is still
4001 to carry on for the next host. */
4002
4003 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4004 {
4005 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4006 expired = FALSE;
4007 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4008 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4009 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4010 host->status = hstatus_unusable;
4011
4012 for (addr = addrlist; addr; addr = addr->next)
4013 {
4014 if (addr->transport_return != DEFER) continue;
4015 addr->basic_errno = ERRNO_UNKNOWNHOST;
4016 addr->message = string_sprintf(
4017 rc == HOST_FIND_SECURITY
4018 ? "lookup of IP address for %s was insecure"
4019 : "failed to lookup IP address for %s",
4020 host->name);
4021 }
4022 continue;
4023 }
4024
4025 /* If the host is actually the local host, we may have a problem, or
4026 there may be some cunning configuration going on. In the problem case,
4027 log things and give up. The default transport status is already DEFER. */
4028
4029 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4030 {
4031 for (addr = addrlist; addr; addr = addr->next)
4032 {
4033 addr->basic_errno = 0;
4034 addr->message = string_sprintf("%s transport found host %s to be "
4035 "local", tblock->name, host->name);
4036 }
4037 goto END_TRANSPORT;
4038 }
4039 } /* End of block for IP address lookup */
4040
4041 /* If this is a continued delivery, we are interested only in the host
4042 which matches the name of the existing open channel. The check is put
4043 here after the local host lookup, in case the name gets expanded as a
4044 result of the lookup. Set expired FALSE, to save the outer loop executing
4045 twice. */
4046
4047 if ( continue_hostname
4048 && ( Ustrcmp(continue_hostname, host->name) != 0
4049 || Ustrcmp(continue_host_address, host->address) != 0
4050 ) )
4051 {
4052 expired = FALSE;
4053 continue; /* With next host */
4054 }
4055
4056 /* Reset the default next host in case a multihomed host whose addresses
4057 are not looked up till just above added to the host list. */
4058
4059 nexthost = host->next;
4060
4061 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4062 domain is in queue_smtp_domains, we don't actually want to attempt any
4063 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4064 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4065 were not in it. We don't want to hold up all SMTP deliveries! Except when
4066 doing a two-stage queue run, don't do this if forcing. */
4067
4068 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4069 match_isinlist(addrlist->domain,
4070 (const uschar **)&queue_smtp_domains, 0,
4071 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4072 {
4073 expired = FALSE;
4074 for (addr = addrlist; addr; addr = addr->next)
4075 if (addr->transport_return == DEFER)
4076 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4077 continue; /* With next host */
4078 }
4079
4080 /* Count hosts being considered - purely for an intelligent comment
4081 if none are usable. */
4082
4083 hosts_total++;
4084
4085 /* Set $host and $host address now in case they are needed for the
4086 interface expansion or the serialize_hosts check; they remain set if an
4087 actual delivery happens. */
4088
4089 deliver_host = host->name;
4090 deliver_host_address = host->address;
4091 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4092 : host->dnssec == DS_NO ? US"no"
4093 : US"";
4094
4095 /* Set up a string for adding to the retry key if the port number is not
4096 the standard SMTP port. A host may have its own port setting that overrides
4097 the default. */
4098
4099 pistring = string_sprintf(":%d", host->port == PORT_NONE
4100 ? defport : host->port);
4101 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4102
4103 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4104 string is set, even if constant (as different transports can have different
4105 constant settings), we must add it to the key that is used for retries,
4106 because connections to the same host from a different interface should be
4107 treated separately. */
4108
4109 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4110 if ((rs = ob->interface) && *rs)
4111 {
4112 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4113 return FALSE;
4114 pistring = string_sprintf("%s/%s", pistring, interface);
4115 }
4116
4117 /* The first time round the outer loop, check the status of the host by
4118 inspecting the retry data. The second time round, we are interested only
4119 in expired hosts that haven't been tried since this message arrived. */
4120
4121 if (cutoff_retry == 0)
4122 {
4123 BOOL incl_ip;
4124 /* Ensure the status of the address is set by checking retry data if
4125 necessary. There may be host-specific retry data (applicable to all
4126 messages) and also data for retries of a specific message at this host.
4127 If either of these retry records are actually read, the keys used are
4128 returned to save recomputing them later. */
4129
4130 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4131 US"retry_include_ip_address", ob->retry_include_ip_address,
4132 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4133 continue; /* with next host */
4134
4135 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4136 incl_ip, &retry_host_key, &retry_message_key);
4137
4138 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4139 (host->address == NULL)? US"" : host->address, pistring,
4140 (host->status == hstatus_usable)? "usable" :
4141 (host->status == hstatus_unusable)? "unusable" :
4142 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4143
4144 /* Skip this address if not usable at this time, noting if it wasn't
4145 actually expired, both locally and in the address. */
4146
4147 switch (host->status)
4148 {
4149 case hstatus_unusable:
4150 expired = FALSE;
4151 setflag(addrlist, af_retry_skipped);
4152 /* Fall through */
4153
4154 case hstatus_unusable_expired:
4155 switch (host->why)
4156 {
4157 case hwhy_retry: hosts_retry++; break;
4158 case hwhy_failed: hosts_fail++; break;
4159 case hwhy_insecure:
4160 case hwhy_deferred: hosts_defer++; break;
4161 }
4162
4163 /* If there was a retry message key, implying that previously there
4164 was a message-specific defer, we don't want to update the list of
4165 messages waiting for these hosts. */
4166
4167 if (retry_message_key) update_waiting = FALSE;
4168 continue; /* With the next host or IP address */
4169 }
4170 }
4171
4172 /* Second time round the loop: if the address is set but expired, and
4173 the message is newer than the last try, let it through. */
4174
4175 else
4176 {
4177 if ( !host->address
4178 || host->status != hstatus_unusable_expired
4179 || host->last_try > received_time.tv_sec)
4180 continue;
4181 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4182 host->name, host->address, pistring);
4183 host_is_expired = TRUE;
4184 }
4185
4186 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4187 it remains TRUE only if all hosts are expired and none are actually tried.
4188 */
4189
4190 expired = FALSE;
4191
4192 /* If this host is listed as one to which access must be serialized,
4193 see if another Exim process has a connection to it, and if so, skip
4194 this host. If not, update the database to record our connection to it
4195 and remember this for later deletion. Do not do any of this if we are
4196 sending the message down a pre-existing connection. */
4197
4198 if ( !continue_hostname
4199 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4200 {
4201 serialize_key = string_sprintf("host-serialize-%s", host->name);
4202 if (!enq_start(serialize_key, 1))
4203 {
4204 DEBUG(D_transport)
4205 debug_printf("skipping host %s because another Exim process "
4206 "is connected to it\n", host->name);
4207 hosts_serial++;
4208 continue;
4209 }
4210 }
4211
4212 /* OK, we have an IP address that is not waiting for its retry time to
4213 arrive (it might be expired) OR (second time round the loop) we have an
4214 expired host that hasn't been tried since the message arrived. Have a go
4215 at delivering the message to it. First prepare the addresses by flushing
4216 out the result of previous attempts, and finding the first address that
4217 is still to be delivered. */
4218
4219 first_addr = prepare_addresses(addrlist, host);
4220
4221 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4222 message_id, host->name, host->address, addrlist->address,
4223 addrlist->next ? ", ..." : "");
4224
4225 set_process_info("delivering %s to %s [%s] (%s%s)",
4226 message_id, host->name, host->address, addrlist->address,
4227 addrlist->next ? ", ..." : "");
4228
4229 /* This is not for real; don't do the delivery. If there are
4230 any remaining hosts, list them. */
4231
4232 if (dont_deliver)
4233 {
4234 host_item *host2;
4235 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4236 for (addr = addrlist; addr; addr = addr->next)
4237 {
4238 addr->host_used = host;
4239 addr->special_action = '*';
4240 addr->message = US"delivery bypassed by -N option";
4241 }
4242 DEBUG(D_transport)
4243 {
4244 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4245 "*** host and remaining hosts:\n", tblock->name);
4246 for (host2 = host; host2; host2 = host2->next)
4247 debug_printf(" %s [%s]\n", host2->name,
4248 host2->address ? host2->address : US"unset");
4249 }
4250 rc = OK;
4251 }
4252
4253 /* This is for real. If the host is expired, we don't count it for
4254 hosts_max_retry. This ensures that all hosts must expire before an address
4255 is timed out, unless hosts_max_try_hardlimit (which protects against
4256 lunatic DNS configurations) is reached.
4257
4258 If the host is not expired and we are about to hit the hosts_max_retry
4259 limit, check to see if there is a subsequent hosts with a different MX
4260 value. If so, make that the next host, and don't count this one. This is a
4261 heuristic to make sure that different MXs do get tried. With a normal kind
4262 of retry rule, they would get tried anyway when the earlier hosts were
4263 delayed, but if the domain has a "retry every time" type of rule - as is
4264 often used for the the very large ISPs, that won't happen. */
4265
4266 else
4267 {
4268 host_item * thost;
4269 /* Make a copy of the host if it is local to this invocation
4270 of the transport. */
4271
4272 if (expanded_hosts)
4273 {
4274 thost = store_get(sizeof(host_item));
4275 *thost = *host;
4276 thost->name = string_copy(host->name);
4277 thost->address = string_copy(host->address);
4278 }
4279 else
4280 thost = host;
4281
4282 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4283 {
4284 host_item *h;
4285 DEBUG(D_transport)
4286 debug_printf("hosts_max_try limit reached with this host\n");
4287 for (h = host; h; h = h->next) if (h->mx != host->mx)
4288 {
4289 nexthost = h;
4290 unexpired_hosts_tried--;
4291 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4292 "and will be tried\n");
4293 break;
4294 }
4295 }
4296
4297 /* Attempt the delivery. */
4298
4299 total_hosts_tried++;
4300 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4301 &message_defer, FALSE);
4302
4303 /* Yield is one of:
4304 OK => connection made, each address contains its result;
4305 message_defer is set for message-specific defers (when all
4306 recipients are marked defer)
4307 DEFER => there was a non-message-specific delivery problem;
4308 ERROR => there was a problem setting up the arguments for a filter,
4309 or there was a problem with expanding added headers
4310 */
4311
4312 /* If the result is not OK, there was a non-message-specific problem.
4313 If the result is DEFER, we need to write to the logs saying what happened
4314 for this particular host, except in the case of authentication and TLS
4315 failures, where the log has already been written. If all hosts defer a
4316 general message is written at the end. */
4317
4318 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4319 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4320 write_logs(first_addr, host);
4321
4322 #ifndef DISABLE_EVENT
4323 if (rc == DEFER)
4324 deferred_event_raise(first_addr, host);
4325 #endif
4326
4327 /* If STARTTLS was accepted, but there was a failure in setting up the
4328 TLS session (usually a certificate screwup), and the host is not in
4329 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4330 TLS forcibly turned off. We have to start from scratch with a new SMTP
4331 connection. That's why the retry is done from here, not from within
4332 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4333 session, so the in-clear transmission after those errors, if permitted,
4334 happens inside smtp_deliver().] */
4335
4336 #ifdef SUPPORT_TLS
4337 if ( rc == DEFER
4338 && first_addr->basic_errno == ERRNO_TLSFAILURE
4339 && ob->tls_tempfail_tryclear
4340 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4341 )
4342 {
4343 log_write(0, LOG_MAIN,
4344 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4345 first_addr->message, host->name, host->address);
4346 first_addr = prepare_addresses(addrlist, host);
4347 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4348 &message_defer, TRUE);
4349 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4350 write_logs(first_addr, host);
4351 # ifndef DISABLE_EVENT
4352 if (rc == DEFER)
4353 deferred_event_raise(first_addr, host);
4354 # endif
4355 }
4356 #endif /*SUPPORT_TLS*/
4357 }
4358
4359 /* Delivery attempt finished */
4360
4361 rs = rc == OK ? US"OK"
4362 : rc == DEFER ? US"DEFER"
4363 : rc == ERROR ? US"ERROR"
4364 : US"?";
4365
4366 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4367 message_id, host->name, host->address, addrlist->address,
4368 addrlist->next ? " (& others)" : "", rs);
4369
4370 /* Release serialization if set up */
4371
4372 if (serialize_key) enq_end(serialize_key);
4373
4374 /* If the result is DEFER, or if a host retry record is known to exist, we
4375 need to add an item to the retry chain for updating the retry database
4376 at the end of delivery. We only need to add the item to the top address,
4377 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4378 for any other delivery attempts using the same address. (It is copied into
4379 the unusable tree at the outer level, so even if different address blocks
4380 contain the same address, it still won't get tried again.) */
4381
4382 if (rc == DEFER || retry_host_key)
4383 {
4384 int delete_flag = rc != DEFER ? rf_delete : 0;
4385 if (!retry_host_key)
4386 {
4387 BOOL incl_ip;
4388 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4389 US"retry_include_ip_address", ob->retry_include_ip_address,
4390 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4391 incl_ip = TRUE; /* error; use most-specific retry record */
4392
4393 retry_host_key = incl_ip
4394 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4395 : string_sprintf("T:%S%s", host->name, pistring);
4396 }
4397
4398 /* If a delivery of another message over an existing SMTP connection
4399 yields DEFER, we do NOT set up retry data for the host. This covers the
4400 case when there are delays in routing the addresses in the second message
4401 that are so long that the server times out. This is alleviated by not
4402 routing addresses that previously had routing defers when handling an
4403 existing connection, but even so, this case may occur (e.g. if a
4404 previously happily routed address starts giving routing defers). If the
4405 host is genuinely down, another non-continued message delivery will
4406 notice it soon enough. */
4407
4408 if (delete_flag != 0 || !continue_hostname)
4409 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4410
4411 /* We may have tried an expired host, if its retry time has come; ensure
4412 the status reflects the expiry for the benefit of any other addresses. */
4413
4414 if (rc == DEFER)
4415 {
4416 host->status = host_is_expired
4417 ? hstatus_unusable_expired : hstatus_unusable;
4418 host->why = hwhy_deferred;
4419 }
4420 }
4421
4422 /* If message_defer is set (host was OK, but every recipient got deferred
4423 because of some message-specific problem), or if that had happened
4424 previously so that a message retry key exists, add an appropriate item
4425 to the retry chain. Note that if there was a message defer but now there is
4426 a host defer, the message defer record gets deleted. That seems perfectly
4427 reasonable. Also, stop the message from being remembered as waiting
4428 for specific hosts. */
4429
4430 if (message_defer || retry_message_key)
4431 {
4432 int delete_flag = message_defer ? 0 : rf_delete;
4433 if (!retry_message_key)
4434 {
4435 BOOL incl_ip;
4436 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4437 US"retry_include_ip_address", ob->retry_include_ip_address,
4438 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4439 incl_ip = TRUE; /* error; use most-specific retry record */
4440
4441 retry_message_key = incl_ip
4442 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4443 message_id)
4444 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4445 }
4446 retry_add_item(addrlist, retry_message_key,
4447 rf_message | rf_host | delete_flag);
4448 update_waiting = FALSE;
4449 }
4450
4451 /* Any return other than DEFER (that is, OK or ERROR) means that the
4452 addresses have got their final statuses filled in for this host. In the OK
4453 case, see if any of them are deferred. */
4454
4455 if (rc == OK)
4456 for (addr = addrlist; addr; addr = addr->next)
4457 if (addr->transport_return == DEFER)
4458 {
4459 some_deferred = TRUE;
4460 break;
4461 }
4462
4463 /* If no addresses deferred or the result was ERROR, return. We do this for
4464 ERROR because a failing filter set-up or add_headers expansion is likely to
4465 fail for any host we try. */
4466
4467 if (rc == ERROR || (rc == OK && !some_deferred))
4468 {
4469 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4470 return TRUE; /* Each address has its status */
4471 }
4472
4473 /* If the result was DEFER or some individual addresses deferred, let
4474 the loop run to try other hosts with the deferred addresses, except for the
4475 case when we were trying to deliver down an existing channel and failed.
4476 Don't try any other hosts in this case. */
4477
4478 if (continue_hostname) break;
4479
4480 /* If the whole delivery, or some individual addresses, were deferred and
4481 there are more hosts that could be tried, do not count this host towards
4482 the hosts_max_try limit if the age of the message is greater than the
4483 maximum retry time for this host. This means we may try try all hosts,
4484 ignoring the limit, when messages have been around for some time. This is
4485 important because if we don't try all hosts, the address will never time
4486 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4487
4488 if ((rc == DEFER || some_deferred) && nexthost)
4489 {
4490 BOOL timedout;
4491 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4492
4493 if (retry && retry->rules)
4494 {
4495 retry_rule *last_rule;
4496 for (last_rule = retry->rules;
4497 last_rule->next;
4498 last_rule = last_rule->next);
4499 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4500 }
4501 else timedout = TRUE; /* No rule => timed out */
4502
4503 if (timedout)
4504 {
4505 unexpired_hosts_tried--;
4506 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4507 "hosts_max_try (message older than host's retry time)\n");
4508 }
4509 }
4510 } /* End of loop for trying multiple hosts. */
4511
4512 /* This is the end of the loop that repeats iff expired is TRUE and
4513 ob->delay_after_cutoff is FALSE. The second time round we will
4514 try those hosts that haven't been tried since the message arrived. */
4515
4516 DEBUG(D_transport)
4517 {
4518 debug_printf("all IP addresses skipped or deferred at least one address\n");
4519 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4520 debug_printf("retrying IP addresses not tried since message arrived\n");
4521 }
4522 }
4523
4524
4525 /* Get here if all IP addresses are skipped or defer at least one address. In
4526 MUA wrapper mode, this will happen only for connection or other non-message-
4527 specific failures. Force the delivery status for all addresses to FAIL. */
4528
4529 if (mua_wrapper)
4530 {
4531 for (addr = addrlist; addr; addr = addr->next)
4532 addr->transport_return = FAIL;
4533 goto END_TRANSPORT;
4534 }
4535
4536 /* In the normal, non-wrapper case, add a standard message to each deferred
4537 address if there hasn't been an error, that is, if it hasn't actually been
4538 tried this time. The variable "expired" will be FALSE if any deliveries were
4539 actually tried, or if there was at least one host that was not expired. That
4540 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4541 a delivery has been tried, an error code will be set, and the failing of the
4542 message is handled by the retry code later.
4543
4544 If queue_smtp is set, or this transport was called to send a subsequent message
4545 down an existing TCP/IP connection, and something caused the host not to be
4546 found, we end up here, but can detect these cases and handle them specially. */
4547
4548 for (addr = addrlist; addr; addr = addr->next)
4549 {
4550 /* If host is not NULL, it means that we stopped processing the host list
4551 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4552 means we need to behave as if some hosts were skipped because their retry
4553 time had not come. Specifically, this prevents the address from timing out.
4554 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4555 hosts were tried. */
4556
4557 if (host)
4558 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4559 {
4560 DEBUG(D_transport)
4561 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4562 "hosts were tried\n");
4563 }
4564 else
4565 {
4566 DEBUG(D_transport)
4567 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4568 setflag(addr, af_retry_skipped);
4569 }
4570
4571 if (queue_smtp) /* no deliveries attempted */
4572 {
4573 addr->transport_return = DEFER;
4574 addr->basic_errno = 0;
4575 addr->message = US"SMTP delivery explicitly queued";
4576 }
4577
4578 else if ( addr->transport_return == DEFER
4579 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4580 && !addr->message
4581 )
4582 {
4583 addr->basic_errno = ERRNO_HRETRY;
4584 if (continue_hostname)
4585 addr->message = US"no host found for existing SMTP connection";
4586 else if (expired)
4587 {
4588 setflag(addr, af_pass_message); /* This is not a security risk */
4589 addr->message = string_sprintf(
4590 "all hosts%s have been failing for a long time %s",
4591 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4592 ob->delay_after_cutoff
4593 ? US"(and retry time not reached)"
4594 : US"and were last tried after this message arrived");
4595
4596 /* If we are already using fallback hosts, or there are no fallback hosts
4597 defined, convert the result to FAIL to cause a bounce. */
4598
4599 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4600 addr->transport_return = FAIL;
4601 }
4602 else
4603 {
4604 const char * s;
4605 if (hosts_retry == hosts_total)
4606 s = "retry time not reached for any host%s";
4607 else if (hosts_fail == hosts_total)
4608 s = "all host address lookups%s failed permanently";
4609 else if (hosts_defer == hosts_total)
4610 s = "all host address lookups%s failed temporarily";
4611 else if (hosts_serial == hosts_total)
4612 s = "connection limit reached for all hosts%s";
4613 else if (hosts_fail+hosts_defer == hosts_total)
4614 s = "all host address lookups%s failed";
4615 else
4616 s = "some host address lookups failed and retry time "
4617 "not reached for other hosts or connection limit reached%s";
4618
4619 addr->message = string_sprintf(s,
4620 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4621 }
4622 }
4623 }
4624
4625 /* Update the database which keeps information about which messages are waiting
4626 for which hosts to become available. For some message-specific errors, the
4627 update_waiting flag is turned off because we don't want follow-on deliveries in
4628 those cases. If this transport instance is explicitly limited to one message
4629 per connection then follow-on deliveries are not possible and there's no need
4630 to create/update the per-transport wait-<transport_name> database. */
4631
4632 if (update_waiting && tblock->connection_max_messages != 1)
4633 transport_update_waiting(hostlist, tblock->name);
4634
4635 END_TRANSPORT:
4636
4637 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4638
4639 return TRUE; /* Each address has its status */
4640 }
4641
4642 #endif /*!MACRO_PREDEF*/
4643 /* vi: aw ai sw=2
4644 */
4645 /* End of transport/smtp.c */
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