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Split macro name storage out from macro definition struct
[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_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
92 #endif
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
100 #endif
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
103 #ifdef SUPPORT_TLS
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
107 # endif
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
111 # endif
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
114 #endif
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122 #endif
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
125 #ifndef DISABLE_PRDR
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 #endif
129 #ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132 #endif
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
153 #ifdef SUPPORT_SOCKS
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 #endif
157 #ifdef SUPPORT_TLS
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
180 #endif
181 };
182
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
185
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189 /* Default private options block for the smtp transport. */
190
191 smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
201 NULL, /* DSCP */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
209 #endif
210 NULL, /* hosts_try_fastopen */
211 #ifndef DISABLE_PRDR
212 US"*", /* hosts_try_prdr */
213 #endif
214 #ifndef DISABLE_OCSP
215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
216 NULL, /* hosts_require_ocsp */
217 #endif
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 NULL, /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
223 #ifdef SUPPORT_TLS
224 NULL, /* hosts_nopass_tls */
225 US"*", /* hosts_noproxy_tls */
226 #endif
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 { NULL, NULL }, /* dnssec_domains {request,require} */
241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
245 FALSE, /* lmtp_ignore_quota */
246 NULL, /* expand_retry_include_ip_address */
247 TRUE /* retry_include_ip_address */
248 #ifdef SUPPORT_SOCKS
249 ,NULL /* socks_proxy */
250 #endif
251 #ifdef SUPPORT_TLS
252 ,NULL, /* tls_certificate */
253 NULL, /* tls_crl */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
256 NULL, /* tls_sni */
257 US"system", /* tls_verify_certificates */
258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
262 US"*", /* tls_try_verify_hosts */
263 US"*" /* tls_verify_cert_hostnames */
264 #endif
265 #ifndef DISABLE_DKIM
266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
273 #endif
274 };
275
276 /* some DSN flags for use later */
277
278 static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
280
281 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
282
283
284
285 /* Local statics */
286
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
291
292 /*XXX move to smtp_context */
293 static BOOL pipelining_active; /* current transaction is in pipe mode */
294
295
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
299
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
302
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
306
307 Arguments:
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
314
315 Returns: OK always (FAIL, DEFER not used)
316 */
317
318 static int
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
321 {
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
324
325 errmsg = errmsg; /* Keep picky compilers happy */
326 uid = uid;
327 gid = gid;
328
329 /* Pass back options if required. This interface is getting very messy. */
330
331 if (tf)
332 {
333 tf->interface = ob->interface;
334 tf->port = ob->port;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
343 }
344
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
347 list. */
348
349 if (!testflag(addrlist, af_local_host_removed))
350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
352
353 return OK;
354 }
355
356
357
358 /*************************************************
359 * Initialization entry point *
360 *************************************************/
361
362 /* Called for each instance, after its options have been read, to
363 enable consistency checks to be done, or anything else that needs
364 to be set up.
365
366 Argument: pointer to the transport instance block
367 Returns: nothing
368 */
369
370 void
371 smtp_transport_init(transport_instance *tblock)
372 {
373 smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
375
376 /* Retry_use_local_part defaults FALSE if unset */
377
378 if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
380
381 /* Set the default port according to the protocol */
382
383 if (ob->port == NULL)
384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
386
387 /* Set up the setup entry point, to be called before subprocesses for this
388 transport. */
389
390 tblock->setup = smtp_transport_setup;
391
392 /* Complain if any of the timeouts are zero. */
393
394 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
398 tblock->name);
399
400 /* If hosts_override is set and there are local hosts, set the global
401 flag that stops verify from showing router hosts. */
402
403 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404
405 /* If there are any fallback hosts listed, build a chain of host items
406 for them, but do not do any lookups at this time. */
407
408 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
409 }
410
411
412
413
414
415 /*************************************************
416 * Set delivery info into all active addresses *
417 *************************************************/
418
419 /* Only addresses whose status is >= PENDING are relevant. A lesser
420 status means that an address is not currently being processed.
421
422 Arguments:
423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
428 host if set, mark addrs as having used this host
429 smtp_greeting from peer
430 helo_response from peer
431
432 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434 this particular type of timeout.
435
436 Returns: nothing
437 */
438
439 static void
440 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
441 BOOL pass_message, host_item * host
442 #ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
444 #endif
445 )
446 {
447 address_item *addr;
448 int orvalue = 0;
449 if (errno_value == ERRNO_CONNECTTIMEOUT)
450 {
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
453 }
454 for (addr = addrlist; addr; addr = addr->next)
455 if (addr->transport_return >= PENDING)
456 {
457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
459 if (msg)
460 {
461 addr->message = msg;
462 if (pass_message) setflag(addr, af_pass_message);
463 }
464 addr->transport_return = rc;
465 if (host)
466 {
467 addr->host_used = host;
468 #ifdef EXPERIMENTAL_DSN_INFO
469 if (smtp_greeting)
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
472
473 if (helo_response)
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
476 #endif
477 }
478 }
479 }
480
481 static void
482 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message)
484 {
485 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486 #ifdef EXPERIMENTAL_DSN_INFO
487 , NULL, NULL
488 #endif
489 );
490 }
491
492
493 /*************************************************
494 * Check an SMTP response *
495 *************************************************/
496
497 /* This function is given an errno code and the SMTP response buffer
498 to analyse, together with the host identification for generating messages. It
499 sets an appropriate message and puts the first digit of the response code into
500 the yield variable. If no response was actually read, a suitable digit is
501 chosen.
502
503 Arguments:
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
509 message where to put an error message
510 pass_message set TRUE if message is an SMTP response
511
512 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
513 */
514
515 static BOOL
516 check_response(host_item *host, int *errno_value, int more_errno,
517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
518 {
519 uschar * pl = pipelining_active ? US"pipelined " : US"";
520 const uschar * s;
521
522 *yield = '4'; /* Default setting is to give a temporary error */
523
524 switch(*errno_value)
525 {
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
537 *message = *s == 0
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
542 return FALSE;
543
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
547 more_errno,
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
549 return FALSE;
550
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
553 *message =
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
556 return FALSE;
557
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
560 return FALSE;
561
562 #ifdef SUPPORT_I18N
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 return TRUE;
567 #endif
568 }
569
570 /* Handle error responses from the remote mailer. */
571
572 if (buffer[0] != 0)
573 {
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
576 *pass_message = TRUE;
577 *yield = buffer[0];
578 return TRUE;
579 }
580
581 /* No data was read. If there is no errno, this must be the EOF (i.e.
582 connection closed) case, which causes deferral. An explicit connection reset
583 error has the same effect. Otherwise, put the host's identity in the message,
584 leaving the errno value to be interpreted as well. In all cases, we have to
585 assume the connection is now dead. */
586
587 if (*errno_value == 0 || *errno_value == ECONNRESET)
588 {
589 *errno_value = ERRNO_SMTPCLOSED;
590 *message = US string_sprintf("Remote host closed connection "
591 "in response to %s%s", pl, smtp_command);
592 }
593 else
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
595
596 return FALSE;
597 }
598
599
600
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
604
605 /* This writes to the main log and to the message log.
606
607 Arguments:
608 addr the address item containing error information
609 host the current host
610
611 Returns: nothing
612 */
613
614 static void
615 write_logs(address_item *addr, host_item *host)
616 {
617 uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
621
622 if (addr->message)
623 {
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630 else
631 {
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
635 }
636 }
637
638 static void
639 msglog_line(host_item * host, uschar * message)
640 {
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
643 }
644
645
646
647 #ifndef DISABLE_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
651
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
654
655 Arguments:
656 addr the address item containing error information
657 host the current host
658
659 Returns: nothing
660 */
661
662 static void
663 deferred_event_raise(address_item *addr, host_item *host)
664 {
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
667 uschar * save_local;
668
669 if (!action)
670 return;
671
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
674
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
679
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
684
685 (void) event_raise(action, US"msg:host:defer",
686 addr->message
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
692 : NULL);
693
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
697 }
698 #endif
699
700 /*************************************************
701 * Synchronize SMTP responses *
702 *************************************************/
703
704 /* This function is called from smtp_deliver() to receive SMTP responses from
705 the server, and match them up with the commands to which they relate. When
706 PIPELINING is not in use, this function is called after every command, and is
707 therefore somewhat over-engineered, but it is simpler to use a single scheme
708 that works both with and without PIPELINING instead of having two separate sets
709 of code.
710
711 The set of commands that are buffered up with pipelining may start with MAIL
712 and may end with DATA; in between are RCPT commands that correspond to the
713 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714 etc.) are never buffered.
715
716 Errors after MAIL or DATA abort the whole process leaving the response in the
717 buffer. After MAIL, pending responses are flushed, and the original command is
718 re-instated in big_buffer for error messages. For RCPT commands, the remote is
719 permitted to reject some recipient addresses while accepting others. However
720 certain errors clearly abort the whole process. Set the value in
721 transport_return to PENDING_OK if the address is accepted. If there is a
722 subsequent general error, it will get reset accordingly. If not, it will get
723 converted to OK at the end.
724
725 Arguments:
726 sx smtp connection context
727 count the number of responses to read
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
731
732 Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
739 */
740
741 static int
742 sync_responses(smtp_context * sx, int count, int pending_DATA)
743 {
744 address_item *addr = sx->sync_addr;
745 smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
747 int yield = 0;
748
749 /* Handle the response for a MAIL command. On error, reinstate the original
750 command in big_buffer for error message use, and flush any further pending
751 responses before returning, except after I/O errors and timeouts. */
752
753 if (sx->pending_MAIL)
754 {
755 count--;
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
758 {
759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
761 if (errno == 0 && sx->buffer[0] != 0)
762 {
763 uschar flushbuffer[4096];
764 int save_errno = 0;
765 if (sx->buffer[0] == '4')
766 {
767 save_errno = ERRNO_MAIL4XX;
768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
769 }
770 while (count-- > 0)
771 {
772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
773 '2', ob->command_timeout)
774 && (errno != 0 || flushbuffer[0] == 0))
775 break;
776 }
777 errno = save_errno;
778 }
779
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
782 {
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
784 addr->host_used = sx->host;
785 addr = addr->next;
786 }
787 return -3;
788 }
789 }
790
791 if (pending_DATA) count--; /* Number of RCPT responses to come */
792
793 /* Read and handle the required number of RCPT responses, matching each one up
794 with an address by scanning for the next address whose status is PENDING_DEFER.
795 */
796
797 while (count-- > 0)
798 {
799 while (addr->transport_return != PENDING_DEFER)
800 if (!(addr = addr->next))
801 return -2;
802
803 /* The address was accepted */
804 addr->host_used = sx->host;
805
806 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
807 '2', ob->command_timeout))
808 {
809 yield |= 1;
810 addr->transport_return = PENDING_OK;
811
812 /* If af_dr_retry_exists is set, there was a routing delay on this address;
813 ensure that any address-specific retry record is expunged. We do this both
814 for the basic key and for the version that also includes the sender. */
815
816 if (testflag(addr, af_dr_retry_exists))
817 {
818 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
819 sender_address);
820 retry_add_item(addr, altkey, rf_delete);
821 retry_add_item(addr, addr->address_retry_key, rf_delete);
822 }
823 }
824
825 /* Timeout while reading the response */
826
827 else if (errno == ETIMEDOUT)
828 {
829 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
830 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
831 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
832 retry_add_item(addr, addr->address_retry_key, 0);
833 update_waiting = FALSE;
834 return -1;
835 }
836
837 /* Handle other errors in obtaining an SMTP response by returning -1. This
838 will cause all the addresses to be deferred. Restore the SMTP command in
839 big_buffer for which we are checking the response, so the error message
840 makes sense. */
841
842 else if (errno != 0 || sx->buffer[0] == 0)
843 {
844 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
845 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
846 return -2;
847 }
848
849 /* Handle SMTP permanent and temporary response codes. */
850
851 else
852 {
853 addr->message =
854 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
855 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
856 string_printing(sx->buffer));
857 setflag(addr, af_pass_message);
858 if (!sx->verify)
859 msglog_line(sx->host, addr->message);
860
861 /* The response was 5xx */
862
863 if (sx->buffer[0] == '5')
864 {
865 addr->transport_return = FAIL;
866 yield |= 2;
867 }
868
869 /* The response was 4xx */
870
871 else
872 {
873 addr->transport_return = DEFER;
874 addr->basic_errno = ERRNO_RCPT4XX;
875 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
876
877 if (!sx->verify)
878 {
879 #ifndef DISABLE_EVENT
880 event_defer_errno = addr->more_errno;
881 msg_event_raise(US"msg:rcpt:host:defer", addr);
882 #endif
883
884 /* Log temporary errors if there are more hosts to be tried.
885 If not, log this last one in the == line. */
886
887 if (sx->host->next)
888 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
889 sx->host->name, sx->host->address, addr->message);
890
891 #ifndef DISABLE_EVENT
892 else
893 msg_event_raise(US"msg:rcpt:defer", addr);
894 #endif
895
896 /* Do not put this message on the list of those waiting for specific
897 hosts, as otherwise it is likely to be tried too often. */
898
899 update_waiting = FALSE;
900
901 /* Add a retry item for the address so that it doesn't get tried again
902 too soon. If address_retry_include_sender is true, add the sender address
903 to the retry key. */
904
905 retry_add_item(addr,
906 ob->address_retry_include_sender
907 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
908 : addr->address_retry_key,
909 0);
910 }
911 }
912 }
913 } /* Loop for next RCPT response */
914
915 /* Update where to start at for the next block of responses, unless we
916 have already handled all the addresses. */
917
918 if (addr) sx->sync_addr = addr->next;
919
920 /* Handle a response to DATA. If we have not had any good recipients, either
921 previously or in this block, the response is ignored. */
922
923 if (pending_DATA != 0 &&
924 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
925 '3', ob->command_timeout))
926 {
927 int code;
928 uschar *msg;
929 BOOL pass_message;
930 if (pending_DATA > 0 || (yield & 1) != 0)
931 {
932 if (errno == 0 && sx->buffer[0] == '4')
933 {
934 errno = ERRNO_DATA4XX;
935 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
936 }
937 return -3;
938 }
939 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
940 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
941 "is in use and there were no good recipients\n", msg);
942 }
943
944 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
945 present) received 3xx. If any RCPTs were handled and yielded anything other
946 than 4xx, yield will be set non-zero. */
947
948 return yield;
949 }
950
951
952
953 /* Do the client side of smtp-level authentication */
954 /*
955 Arguments:
956 buffer EHLO response from server (gets overwritten)
957 addrlist chain of potential addresses to deliver
958 host host to deliver to
959 ob transport options
960 ibp, obp comms channel control blocks
961
962 Returns:
963 OK Success, or failed (but not required): global "smtp_authenticated" set
964 DEFER Failed authentication (and was required)
965 ERROR Internal problem
966
967 FAIL_SEND Failed communications - transmit
968 FAIL - response
969 */
970
971 int
972 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
973 smtp_transport_options_block *ob, BOOL is_esmtp,
974 smtp_inblock *ibp, smtp_outblock *obp)
975 {
976 int require_auth;
977 uschar *fail_reason = US"server did not advertise AUTH support";
978
979 smtp_authenticated = FALSE;
980 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
981 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
982
983 if (is_esmtp && !regex_AUTH) regex_AUTH =
984 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
985 FALSE, TRUE);
986
987 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
988 {
989 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
990 expand_nmax = -1; /* reset */
991
992 /* Must not do this check until after we have saved the result of the
993 regex match above. */
994
995 if (require_auth == OK ||
996 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
997 {
998 auth_instance *au;
999 fail_reason = US"no common mechanisms were found";
1000
1001 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1002
1003 /* Scan the configured authenticators looking for one which is configured
1004 for use as a client, which is not suppressed by client_condition, and
1005 whose name matches an authentication mechanism supported by the server.
1006 If one is found, attempt to authenticate by calling its client function.
1007 */
1008
1009 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1010 {
1011 uschar *p = names;
1012 if (!au->client ||
1013 (au->client_condition != NULL &&
1014 !expand_check_condition(au->client_condition, au->name,
1015 US"client authenticator")))
1016 {
1017 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1018 au->name,
1019 (au->client)? "client_condition is false" :
1020 "not configured as a client");
1021 continue;
1022 }
1023
1024 /* Loop to scan supported server mechanisms */
1025
1026 while (*p != 0)
1027 {
1028 int rc;
1029 int len = Ustrlen(au->public_name);
1030 while (isspace(*p)) p++;
1031
1032 if (strncmpic(au->public_name, p, len) != 0 ||
1033 (p[len] != 0 && !isspace(p[len])))
1034 {
1035 while (*p != 0 && !isspace(*p)) p++;
1036 continue;
1037 }
1038
1039 /* Found data for a listed mechanism. Call its client entry. Set
1040 a flag in the outblock so that data is overwritten after sending so
1041 that reflections don't show it. */
1042
1043 fail_reason = US"authentication attempt(s) failed";
1044 obp->authenticating = TRUE;
1045 rc = (au->info->clientcode)(au, ibp, obp,
1046 ob->command_timeout, buffer, bufsize);
1047 obp->authenticating = FALSE;
1048 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1049 au->name, rc);
1050
1051 /* A temporary authentication failure must hold up delivery to
1052 this host. After a permanent authentication failure, we carry on
1053 to try other authentication methods. If all fail hard, try to
1054 deliver the message unauthenticated unless require_auth was set. */
1055
1056 switch(rc)
1057 {
1058 case OK:
1059 smtp_authenticated = TRUE; /* stops the outer loop */
1060 client_authenticator = au->name;
1061 if (au->set_client_id != NULL)
1062 client_authenticated_id = expand_string(au->set_client_id);
1063 break;
1064
1065 /* Failure after writing a command */
1066
1067 case FAIL_SEND:
1068 return FAIL_SEND;
1069
1070 /* Failure after reading a response */
1071
1072 case FAIL:
1073 if (errno != 0 || buffer[0] != '5') return FAIL;
1074 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1075 au->name, host->name, host->address, buffer);
1076 break;
1077
1078 /* Failure by some other means. In effect, the authenticator
1079 decided it wasn't prepared to handle this case. Typically this
1080 is the result of "fail" in an expansion string. Do we need to
1081 log anything here? Feb 2006: a message is now put in the buffer
1082 if logging is required. */
1083
1084 case CANCELLED:
1085 if (*buffer != 0)
1086 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1087 "authentication H=%s [%s] %s", au->name, host->name,
1088 host->address, buffer);
1089 break;
1090
1091 /* Internal problem, message in buffer. */
1092
1093 case ERROR:
1094 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1095 DEFER, FALSE);
1096 return ERROR;
1097 }
1098
1099 break; /* If not authenticated, try next authenticator */
1100 } /* Loop for scanning supported server mechanisms */
1101 } /* Loop for further authenticators */
1102 }
1103 }
1104
1105 /* If we haven't authenticated, but are required to, give up. */
1106
1107 if (require_auth == OK && !smtp_authenticated)
1108 {
1109 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1110 string_sprintf("authentication required but %s", fail_reason), DEFER,
1111 FALSE);
1112 return DEFER;
1113 }
1114
1115 return OK;
1116 }
1117
1118
1119 /* Construct AUTH appendix string for MAIL TO */
1120 /*
1121 Arguments
1122 buffer to build string
1123 addrlist chain of potential addresses to deliver
1124 ob transport options
1125
1126 Globals smtp_authenticated
1127 client_authenticated_sender
1128 Return True on error, otherwise buffer has (possibly empty) terminated string
1129 */
1130
1131 BOOL
1132 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1133 smtp_transport_options_block *ob)
1134 {
1135 uschar *local_authenticated_sender = authenticated_sender;
1136
1137 #ifdef notdef
1138 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1139 #endif
1140
1141 if (ob->authenticated_sender != NULL)
1142 {
1143 uschar *new = expand_string(ob->authenticated_sender);
1144 if (new == NULL)
1145 {
1146 if (!expand_string_forcedfail)
1147 {
1148 uschar *message = string_sprintf("failed to expand "
1149 "authenticated_sender: %s", expand_string_message);
1150 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1151 return TRUE;
1152 }
1153 }
1154 else if (new[0] != 0) local_authenticated_sender = new;
1155 }
1156
1157 /* Add the authenticated sender address if present */
1158
1159 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1160 local_authenticated_sender != NULL)
1161 {
1162 string_format(buffer, bufsize, " AUTH=%s",
1163 auth_xtextencode(local_authenticated_sender,
1164 Ustrlen(local_authenticated_sender)));
1165 client_authenticated_sender = string_copy(local_authenticated_sender);
1166 }
1167 else
1168 *buffer= 0;
1169
1170 return FALSE;
1171 }
1172
1173
1174
1175 #ifdef EXPERIMENTAL_DANE
1176 /* Lookup TLSA record for host/port.
1177 Return: OK success with dnssec; DANE mode
1178 DEFER Do not use this host now, may retry later
1179 FAIL_FORCED No TLSA record; DANE not usable
1180 FAIL Do not use this connection
1181 */
1182
1183 int
1184 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1185 {
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1187 uschar buffer[300];
1188 const uschar * fullname = buffer;
1189 int rc;
1190 BOOL sec;
1191
1192 /* TLSA lookup string */
1193 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1194
1195 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1196 sec = dns_is_secure(dnsa);
1197 DEBUG(D_transport)
1198 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1199
1200 switch (rc)
1201 {
1202 case DNS_SUCCEED:
1203 if (sec) return OK;
1204
1205 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1206 /*FALLTHROUGH*/
1207 case DNS_AGAIN:
1208 return DEFER; /* just defer this TLS'd conn */
1209
1210 case DNS_NODATA: /* no TLSA RR for this lookup */
1211 case DNS_NOMATCH: /* no records at all for this lookup */
1212 return dane_required ? FAIL : FAIL_FORCED;
1213
1214 default:
1215 case DNS_FAIL:
1216 return dane_required ? FAIL : DEFER;
1217 }
1218 }
1219 #endif
1220
1221
1222
1223 typedef struct smtp_compare_s
1224 {
1225 uschar *current_sender_address;
1226 struct transport_instance *tblock;
1227 } smtp_compare_t;
1228
1229
1230 /* Create a unique string that identifies this message, it is based on
1231 sender_address, helo_data and tls_certificate if enabled.
1232 */
1233
1234 static uschar *
1235 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1236 {
1237 address_item * addr1;
1238 uschar * if1 = US"";
1239 uschar * helo1 = US"";
1240 #ifdef SUPPORT_TLS
1241 uschar * tlsc1 = US"";
1242 #endif
1243 uschar * save_sender_address = sender_address;
1244 uschar * local_identity = NULL;
1245 smtp_transport_options_block * ob =
1246 (smtp_transport_options_block *)tblock->options_block;
1247
1248 sender_address = sender;
1249
1250 addr1 = deliver_make_addr (sender, TRUE);
1251 deliver_set_expansions(addr1);
1252
1253 if (ob->interface)
1254 if1 = expand_string(ob->interface);
1255
1256 if (ob->helo_data)
1257 helo1 = expand_string(ob->helo_data);
1258
1259 #ifdef SUPPORT_TLS
1260 if (ob->tls_certificate)
1261 tlsc1 = expand_string(ob->tls_certificate);
1262 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1263 #else
1264 local_identity = string_sprintf ("%s^%s", if1, helo1);
1265 #endif
1266
1267 deliver_set_expansions(NULL);
1268 sender_address = save_sender_address;
1269
1270 return local_identity;
1271 }
1272
1273
1274
1275 /* This routine is a callback that is called from transport_check_waiting.
1276 This function will evaluate the incoming message versus the previous
1277 message. If the incoming message is using a different local identity then
1278 we will veto this new message. */
1279
1280 static BOOL
1281 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1282 {
1283 uschar * message_local_identity,
1284 * current_local_identity,
1285 * new_sender_address;
1286
1287 current_local_identity =
1288 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1289
1290 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1291 return 0;
1292
1293 message_local_identity =
1294 smtp_local_identity(new_sender_address, s_compare->tblock);
1295
1296 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1297 }
1298
1299
1300
1301 static uschar
1302 ehlo_response(uschar * buf, uschar checks)
1303 {
1304 size_t bsize = Ustrlen(buf);
1305
1306 #ifdef SUPPORT_TLS
1307 if ( checks & PEER_OFFERED_TLS
1308 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_TLS;
1310 #endif
1311
1312 if ( checks & PEER_OFFERED_IGNQ
1313 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1314 PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_IGNQ;
1316
1317 if ( checks & PEER_OFFERED_CHUNKING
1318 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_CHUNKING;
1320
1321 #ifndef DISABLE_PRDR
1322 if ( checks & PEER_OFFERED_PRDR
1323 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_PRDR;
1325 #endif
1326
1327 #ifdef SUPPORT_I18N
1328 if ( checks & PEER_OFFERED_UTF8
1329 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1330 checks &= ~PEER_OFFERED_UTF8;
1331 #endif
1332
1333 if ( checks & PEER_OFFERED_DSN
1334 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1335 checks &= ~PEER_OFFERED_DSN;
1336
1337 if ( checks & PEER_OFFERED_PIPE
1338 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1339 PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_PIPE;
1341
1342 if ( checks & PEER_OFFERED_SIZE
1343 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_SIZE;
1345
1346 return checks;
1347 }
1348
1349
1350
1351 /* Callback for emitting a BDAT data chunk header.
1352
1353 If given a nonzero size, first flush any buffered SMTP commands
1354 then emit the command.
1355
1356 Reap previous SMTP command responses if requested, and always reap
1357 the response from a previous BDAT command.
1358
1359 Args:
1360 tctx transport context
1361 chunk_size value for SMTP BDAT command
1362 flags
1363 tc_chunk_last add LAST option to SMTP BDAT command
1364 tc_reap_prev reap response to previous SMTP commands
1365
1366 Returns: OK or ERROR
1367 */
1368
1369 static int
1370 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1371 unsigned flags)
1372 {
1373 smtp_transport_options_block * ob =
1374 (smtp_transport_options_block *)(tctx->tblock->options_block);
1375 smtp_context * sx = tctx->smtp_context;
1376 int cmd_count = 0;
1377 int prev_cmd_count;
1378
1379 /* Write SMTP chunk header command. If not reaping responses, note that
1380 there may be more writes (like, the chunk data) done soon. */
1381
1382 if (chunk_size > 0)
1383 {
1384 if((cmd_count = smtp_write_command(&sx->outblock,
1385 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1386 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1387 ) < 0) return ERROR;
1388 if (flags & tc_chunk_last)
1389 data_command = string_copy(big_buffer); /* Save for later error message */
1390 }
1391
1392 prev_cmd_count = cmd_count += sx->cmd_count;
1393
1394 /* Reap responses for any previous, but not one we just emitted */
1395
1396 if (chunk_size > 0)
1397 prev_cmd_count--;
1398 if (sx->pending_BDAT)
1399 prev_cmd_count--;
1400
1401 if (flags & tc_reap_prev && prev_cmd_count > 0)
1402 {
1403 DEBUG(D_transport) debug_printf("look for %d responses"
1404 " for previous pipelined cmds\n", prev_cmd_count);
1405
1406 switch(sync_responses(sx, prev_cmd_count, 0))
1407 {
1408 case 1: /* 2xx (only) => OK */
1409 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1410 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1411 case 0: break; /* No 2xx or 5xx, but no probs */
1412
1413 case -1: /* Timeout on RCPT */
1414 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1415 }
1416 cmd_count = 1;
1417 if (!sx->pending_BDAT)
1418 pipelining_active = FALSE;
1419 }
1420
1421 /* Reap response for an outstanding BDAT */
1422
1423 if (sx->pending_BDAT)
1424 {
1425 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1426
1427 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1428 ob->command_timeout))
1429 {
1430 if (errno == 0 && sx->buffer[0] == '4')
1431 {
1432 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1433 sx->addrlist->more_errno |=
1434 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1435 }
1436 return ERROR;
1437 }
1438 cmd_count--;
1439 sx->pending_BDAT = FALSE;
1440 pipelining_active = FALSE;
1441 }
1442 else if (chunk_size > 0)
1443 sx->pending_BDAT = TRUE;
1444
1445
1446 sx->cmd_count = cmd_count;
1447 return OK;
1448 }
1449
1450
1451
1452 /*************************************************
1453 * Make connection for given message *
1454 *************************************************/
1455
1456 /*
1457 Arguments:
1458 ctx connection context
1459 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1460 a second attempt after TLS initialization fails
1461
1462 Returns: OK - the connection was made and the delivery attempted;
1463 fd is set in the conn context, tls_out set up.
1464 DEFER - the connection could not be made, or something failed
1465 while setting up the SMTP session, or there was a
1466 non-message-specific error, such as a timeout.
1467 ERROR - helo_data or add_headers or authenticated_sender is
1468 specified for this transport, and the string failed
1469 to expand
1470 */
1471 int
1472 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1473 {
1474 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1475 dns_answer tlsa_dnsa;
1476 #endif
1477 BOOL pass_message = FALSE;
1478 uschar * message = NULL;
1479 int yield = OK;
1480 int rc;
1481
1482 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1483
1484 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1485 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1486 sx->ok = FALSE;
1487 sx->send_rset = TRUE;
1488 sx->send_quit = TRUE;
1489 sx->setting_up = TRUE;
1490 sx->esmtp = TRUE;
1491 sx->esmtp_sent = FALSE;
1492 #ifdef SUPPORT_I18N
1493 sx->utf8_needed = FALSE;
1494 #endif
1495 sx->dsn_all_lasthop = TRUE;
1496 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1497 sx->dane = FALSE;
1498 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1499 #endif
1500
1501 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1502 sx->peer_offered = 0;
1503 sx->igquotstr = US"";
1504 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1505 #ifdef EXPERIMENTAL_DSN_INFO
1506 sx->smtp_greeting = NULL;
1507 sx->helo_response = NULL;
1508 #endif
1509
1510 smtp_command = US"initial connection";
1511 sx->buffer[0] = '\0';
1512
1513 /* Set up the buffer for reading SMTP response packets. */
1514
1515 sx->inblock.buffer = sx->inbuffer;
1516 sx->inblock.buffersize = sizeof(sx->inbuffer);
1517 sx->inblock.ptr = sx->inbuffer;
1518 sx->inblock.ptrend = sx->inbuffer;
1519
1520 /* Set up the buffer for holding SMTP commands while pipelining */
1521
1522 sx->outblock.buffer = sx->outbuffer;
1523 sx->outblock.buffersize = sizeof(sx->outbuffer);
1524 sx->outblock.ptr = sx->outbuffer;
1525 sx->outblock.cmd_count = 0;
1526 sx->outblock.authenticating = FALSE;
1527
1528 /* Reset the parameters of a TLS session. */
1529
1530 tls_out.bits = 0;
1531 tls_out.cipher = NULL; /* the one we may use for this transport */
1532 tls_out.ourcert = NULL;
1533 tls_out.peercert = NULL;
1534 tls_out.peerdn = NULL;
1535 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1536 tls_out.sni = NULL;
1537 #endif
1538 tls_out.ocsp = OCSP_NOT_REQ;
1539
1540 /* Flip the legacy TLS-related variables over to the outbound set in case
1541 they're used in the context of the transport. Don't bother resetting
1542 afterward (when being used by a transport) as we're in a subprocess.
1543 For verify, unflipped once the callout is dealt with */
1544
1545 tls_modify_variables(&tls_out);
1546
1547 #ifndef SUPPORT_TLS
1548 if (sx->smtps)
1549 {
1550 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1551 DEFER, FALSE);
1552 return ERROR;
1553 }
1554 #endif
1555
1556 /* Make a connection to the host if this isn't a continued delivery, and handle
1557 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1558 specially so they can be identified for retries. */
1559
1560 if (!continue_hostname)
1561 {
1562 if (sx->verify)
1563 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1564
1565 /* Get the actual port the connection will use, into sx->host */
1566
1567 smtp_port_for_connect(sx->host, sx->port);
1568
1569 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1570 /* Do TLSA lookup for DANE */
1571 {
1572 tls_out.dane_verified = FALSE;
1573 tls_out.tlsa_usage = 0;
1574
1575 if (sx->host->dnssec == DS_YES)
1576 {
1577 if( sx->dane_required
1578 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1579 )
1580 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1581 {
1582 case OK: sx->dane = TRUE;
1583 sx->ob->tls_tempfail_tryclear = FALSE;
1584 break;
1585 case FAIL_FORCED: break;
1586 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1587 string_sprintf("DANE error: tlsa lookup %s",
1588 rc == DEFER ? "DEFER" : "FAIL"),
1589 rc, FALSE);
1590 return rc;
1591 }
1592 }
1593 else if (sx->dane_required)
1594 {
1595 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1596 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1597 FAIL, FALSE);
1598 return FAIL;
1599 }
1600 }
1601 #endif /*DANE*/
1602
1603 /* Make the TCP connection */
1604
1605 sx->inblock.sock = sx->outblock.sock =
1606 smtp_connect(sx->host, sx->host_af, sx->interface,
1607 sx->ob->connect_timeout, sx->tblock);
1608
1609 if (sx->inblock.sock < 0)
1610 {
1611 uschar * msg = NULL;
1612 if (sx->verify)
1613 {
1614 msg = US strerror(errno);
1615 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1616 }
1617 set_errno_nohost(sx->addrlist,
1618 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1619 sx->verify ? string_sprintf("could not connect: %s", msg)
1620 : NULL,
1621 DEFER, FALSE);
1622 sx->send_quit = FALSE;
1623 return DEFER;
1624 }
1625
1626 /* Expand the greeting message while waiting for the initial response. (Makes
1627 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1628 delayed till here so that $sending_interface and $sending_port are set. */
1629
1630 if (sx->helo_data)
1631 if (!(sx->helo_data = expand_string(sx->helo_data)))
1632 if (sx->verify)
1633 log_write(0, LOG_MAIN|LOG_PANIC,
1634 "<%s>: failed to expand transport's helo_data value for callout: %s",
1635 sx->addrlist->address, expand_string_message);
1636
1637 #ifdef SUPPORT_I18N
1638 if (sx->helo_data)
1639 {
1640 expand_string_message = NULL;
1641 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1642 &expand_string_message)),
1643 expand_string_message)
1644 if (sx->verify)
1645 log_write(0, LOG_MAIN|LOG_PANIC,
1646 "<%s>: failed to expand transport's helo_data value for callout: %s",
1647 sx->addrlist->address, expand_string_message);
1648 else
1649 sx->helo_data = NULL;
1650 }
1651 #endif
1652
1653 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1654 is nevertheless a reasonably clean way of programming this kind of logic,
1655 where you want to escape on any error. */
1656
1657 if (!sx->smtps)
1658 {
1659 BOOL good_response;
1660
1661 #ifdef TCP_QUICKACK
1662 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1663 #endif
1664 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1665 '2', sx->ob->command_timeout);
1666 #ifdef EXPERIMENTAL_DSN_INFO
1667 sx->smtp_greeting = string_copy(sx->buffer);
1668 #endif
1669 if (!good_response) goto RESPONSE_FAILED;
1670
1671 #ifndef DISABLE_EVENT
1672 {
1673 uschar * s;
1674 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1675 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1676 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1677 if (s)
1678 {
1679 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1680 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1681 DEFER, FALSE);
1682 yield = DEFER;
1683 goto SEND_QUIT;
1684 }
1685 }
1686 #endif
1687
1688 /* Now check if the helo_data expansion went well, and sign off cleanly if
1689 it didn't. */
1690
1691 if (!sx->helo_data)
1692 {
1693 message = string_sprintf("failed to expand helo_data: %s",
1694 expand_string_message);
1695 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1696 yield = DEFER;
1697 goto SEND_QUIT;
1698 }
1699 }
1700
1701 /** Debugging without sending a message
1702 sx->addrlist->transport_return = DEFER;
1703 goto SEND_QUIT;
1704 **/
1705
1706 /* Errors that occur after this point follow an SMTP command, which is
1707 left in big_buffer by smtp_write_command() for use in error messages. */
1708
1709 smtp_command = big_buffer;
1710
1711 /* Tell the remote who we are...
1712
1713 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1714 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1715 greeting is of this form. The assumption was that the far end supports it
1716 properly... but experience shows that there are some that give 5xx responses,
1717 even though the banner includes "ESMTP" (there's a bloody-minded one that
1718 says "ESMTP not spoken here"). Cope with that case.
1719
1720 September 2000: Time has passed, and it seems reasonable now to always send
1721 EHLO at the start. It is also convenient to make the change while installing
1722 the TLS stuff.
1723
1724 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1725 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1726 would be no way to send out the mails, so there is now a host list
1727 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1728 PIPELINING problem as well. Maybe it can also be useful to cure other
1729 problems with broken servers.
1730
1731 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1732 Then somebody tried it with a Microsoft mailer... It seems that all other
1733 mailers use upper case for some reason (the RFC is quite clear about case
1734 independence) so, for peace of mind, I gave in. */
1735
1736 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1737
1738 /* Alas; be careful, since this goto is not an error-out, so conceivably
1739 we might set data between here and the target which we assume to exist
1740 and be usable. I can see this coming back to bite us. */
1741 #ifdef SUPPORT_TLS
1742 if (sx->smtps)
1743 {
1744 smtp_peer_options |= PEER_OFFERED_TLS;
1745 suppress_tls = FALSE;
1746 sx->ob->tls_tempfail_tryclear = FALSE;
1747 smtp_command = US"SSL-on-connect";
1748 goto TLS_NEGOTIATE;
1749 }
1750 #endif
1751
1752 if (sx->esmtp)
1753 {
1754 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1755 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1756 goto SEND_FAILED;
1757 sx->esmtp_sent = TRUE;
1758 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1759 sx->ob->command_timeout))
1760 {
1761 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1762 {
1763 #ifdef EXPERIMENTAL_DSN_INFO
1764 sx->helo_response = string_copy(sx->buffer);
1765 #endif
1766 goto RESPONSE_FAILED;
1767 }
1768 sx->esmtp = FALSE;
1769 }
1770 #ifdef EXPERIMENTAL_DSN_INFO
1771 sx->helo_response = string_copy(sx->buffer);
1772 #endif
1773 }
1774 else
1775 DEBUG(D_transport)
1776 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1777
1778 if (!sx->esmtp)
1779 {
1780 BOOL good_response;
1781 int n = sizeof(sx->buffer);
1782 uschar * rsp = sx->buffer;
1783
1784 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1785 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1786
1787 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1788 goto SEND_FAILED;
1789 good_response = smtp_read_response(&sx->inblock, rsp, n,
1790 '2', sx->ob->command_timeout);
1791 #ifdef EXPERIMENTAL_DSN_INFO
1792 sx->helo_response = string_copy(rsp);
1793 #endif
1794 if (!good_response)
1795 {
1796 /* Handle special logging for a closed connection after HELO
1797 when had previously sent EHLO */
1798
1799 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1800 {
1801 errno = ERRNO_SMTPCLOSED;
1802 goto EHLOHELO_FAILED;
1803 }
1804 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1805 goto RESPONSE_FAILED;
1806 }
1807 }
1808
1809 sx->peer_offered = smtp_peer_options = 0;
1810
1811 if (sx->esmtp || sx->lmtp)
1812 {
1813 sx->peer_offered = ehlo_response(sx->buffer,
1814 PEER_OFFERED_TLS /* others checked later */
1815 );
1816
1817 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1818
1819 #ifdef SUPPORT_TLS
1820 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1821 #endif
1822 }
1823 }
1824
1825 /* For continuing deliveries down the same channel, having re-exec'd the socket
1826 is the standard input; for a socket held open from verify it is recorded
1827 in the cutthrough context block. Either way we don't need to redo EHLO here
1828 (but may need to do so for TLS - see below).
1829 Set up the pointer to where subsequent commands will be left, for
1830 error messages. Note that smtp_peer_options will have been
1831 set from the command line if they were set in the process that passed the
1832 connection on. */
1833
1834 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1835 as the continue goes via transport_pass_socket() and doublefork and exec.
1836 It does not wait. Unclear how we keep separate host's responses
1837 separate - we could match up by host ip+port as a bodge. */
1838
1839 else
1840 {
1841 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1842 {
1843 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1844 sx->host->port = sx->port = cutthrough.host.port;
1845 }
1846 else
1847 {
1848 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1849 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1850 }
1851 smtp_command = big_buffer;
1852 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1853
1854 /* For a continued connection with TLS being proxied for us, or a
1855 held-open verify connection with TLS, nothing more to do. */
1856
1857 if ( continue_proxy_cipher
1858 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1859 )
1860 {
1861 sx->peer_offered = smtp_peer_options;
1862 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1863 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1864 continue_proxy_cipher ? "proxied" : "verify conn with");
1865 return OK;
1866 }
1867 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1868 }
1869
1870 /* If TLS is available on this connection, whether continued or not, attempt to
1871 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1872 send another EHLO - the server may give a different answer in secure mode. We
1873 use a separate buffer for reading the response to STARTTLS so that if it is
1874 negative, the original EHLO data is available for subsequent analysis, should
1875 the client not be required to use TLS. If the response is bad, copy the buffer
1876 for error analysis. */
1877
1878 #ifdef SUPPORT_TLS
1879 if ( smtp_peer_options & PEER_OFFERED_TLS
1880 && !suppress_tls
1881 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1882 && ( !sx->verify
1883 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1884 ) )
1885 {
1886 uschar buffer2[4096];
1887 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1888 goto SEND_FAILED;
1889
1890 /* If there is an I/O error, transmission of this message is deferred. If
1891 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1892 false, we also defer. However, if there is a temporary rejection of STARTTLS
1893 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1894 STARTTLS, we carry on. This means we will try to send the message in clear,
1895 unless the host is in hosts_require_tls (tested below). */
1896
1897 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1898 sx->ob->command_timeout))
1899 {
1900 if ( errno != 0
1901 || buffer2[0] == 0
1902 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1903 )
1904 {
1905 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1906 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1907 goto RESPONSE_FAILED;
1908 }
1909 }
1910
1911 /* STARTTLS accepted: try to negotiate a TLS session. */
1912
1913 else
1914 TLS_NEGOTIATE:
1915 {
1916 address_item * addr;
1917 uschar * errstr;
1918 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1919 # ifdef EXPERIMENTAL_DANE
1920 sx->dane ? &tlsa_dnsa : NULL,
1921 # endif
1922 &errstr);
1923
1924 /* TLS negotiation failed; give an error. From outside, this function may
1925 be called again to try in clear on a new connection, if the options permit
1926 it for this host. */
1927
1928 if (rc != OK)
1929 {
1930 # ifdef EXPERIMENTAL_DANE
1931 if (sx->dane) log_write(0, LOG_MAIN,
1932 "DANE attempt failed; TLS connection to %s [%s]: %s",
1933 sx->host->name, sx->host->address, errstr);
1934 # endif
1935
1936 errno = ERRNO_TLSFAILURE;
1937 message = string_sprintf("TLS session: %s", errstr);
1938 sx->send_quit = FALSE;
1939 goto TLS_FAILED;
1940 }
1941
1942 /* TLS session is set up */
1943
1944 smtp_peer_options_wrap = smtp_peer_options;
1945 for (addr = sx->addrlist; addr; addr = addr->next)
1946 if (addr->transport_return == PENDING_DEFER)
1947 {
1948 addr->cipher = tls_out.cipher;
1949 addr->ourcert = tls_out.ourcert;
1950 addr->peercert = tls_out.peercert;
1951 addr->peerdn = tls_out.peerdn;
1952 addr->ocsp = tls_out.ocsp;
1953 }
1954 }
1955 }
1956
1957 /* if smtps, we'll have smtp_command set to something else; always safe to
1958 reset it here. */
1959 smtp_command = big_buffer;
1960
1961 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1962 helo_data is null, we are dealing with a connection that was passed from
1963 another process, and so we won't have expanded helo_data above. We have to
1964 expand it here. $sending_ip_address and $sending_port are set up right at the
1965 start of the Exim process (in exim.c). */
1966
1967 if (tls_out.active >= 0)
1968 {
1969 char *greeting_cmd;
1970 BOOL good_response;
1971
1972 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1973 {
1974 uschar *message = string_sprintf("failed to expand helo_data: %s",
1975 expand_string_message);
1976 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1977 yield = DEFER;
1978 goto SEND_QUIT;
1979 }
1980
1981 /* For SMTPS we need to wait for the initial OK response. */
1982 if (sx->smtps)
1983 {
1984 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1985 '2', sx->ob->command_timeout);
1986 #ifdef EXPERIMENTAL_DSN_INFO
1987 sx->smtp_greeting = string_copy(sx->buffer);
1988 #endif
1989 if (!good_response) goto RESPONSE_FAILED;
1990 }
1991
1992 if (sx->esmtp)
1993 greeting_cmd = "EHLO";
1994 else
1995 {
1996 greeting_cmd = "HELO";
1997 DEBUG(D_transport)
1998 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1999 }
2000
2001 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2002 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2003 goto SEND_FAILED;
2004 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2005 '2', sx->ob->command_timeout);
2006 #ifdef EXPERIMENTAL_DSN_INFO
2007 sx->helo_response = string_copy(sx->buffer);
2008 #endif
2009 if (!good_response) goto RESPONSE_FAILED;
2010 smtp_peer_options = 0;
2011 }
2012
2013 /* If the host is required to use a secure channel, ensure that we
2014 have one. */
2015
2016 else if ( sx->smtps
2017 # ifdef EXPERIMENTAL_DANE
2018 || sx->dane
2019 # endif
2020 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2021 )
2022 {
2023 errno = ERRNO_TLSREQUIRED;
2024 message = string_sprintf("a TLS session is required, but %s",
2025 smtp_peer_options & PEER_OFFERED_TLS
2026 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2027 goto TLS_FAILED;
2028 }
2029 #endif /*SUPPORT_TLS*/
2030
2031 /* If TLS is active, we have just started it up and re-done the EHLO command,
2032 so its response needs to be analyzed. If TLS is not active and this is a
2033 continued session down a previously-used socket, we haven't just done EHLO, so
2034 we skip this. */
2035
2036 if (continue_hostname == NULL
2037 #ifdef SUPPORT_TLS
2038 || tls_out.active >= 0
2039 #endif
2040 )
2041 {
2042 if (sx->esmtp || sx->lmtp)
2043 {
2044 sx->peer_offered = ehlo_response(sx->buffer,
2045 0 /* no TLS */
2046 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2047 | PEER_OFFERED_CHUNKING
2048 | PEER_OFFERED_PRDR
2049 #ifdef SUPPORT_I18N
2050 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2051 /*XXX if we hand peercaps on to continued-conn processes,
2052 must not depend on this addr */
2053 #endif
2054 | PEER_OFFERED_DSN
2055 | PEER_OFFERED_PIPE
2056 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2057 );
2058
2059 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2060 lmtp_ignore_quota option was set. */
2061
2062 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2063
2064 /* If the response to EHLO specified support for the SIZE parameter, note
2065 this, provided size_addition is non-negative. */
2066
2067 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2068
2069 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2070 the current host, esmtp will be false, so PIPELINING can never be used. If
2071 the current host matches hosts_avoid_pipelining, don't do it. */
2072
2073 if ( sx->peer_offered & PEER_OFFERED_PIPE
2074 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2075 smtp_peer_options |= PEER_OFFERED_PIPE;
2076
2077 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2078 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2079
2080 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2081 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2082 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2083
2084 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2085 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2086
2087 #ifndef DISABLE_PRDR
2088 if ( sx->peer_offered & PEER_OFFERED_PRDR
2089 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2090 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2091
2092 if (sx->peer_offered & PEER_OFFERED_PRDR)
2093 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2094 #endif
2095
2096 /* Note if the server supports DSN */
2097 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2098 DEBUG(D_transport) debug_printf("%susing DSN\n",
2099 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2100
2101 /* Note if the response to EHLO specifies support for the AUTH extension.
2102 If it has, check that this host is one we want to authenticate to, and do
2103 the business. The host name and address must be available when the
2104 authenticator's client driver is running. */
2105
2106 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2107 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2108 {
2109 default: goto SEND_QUIT;
2110 case OK: break;
2111 case FAIL_SEND: goto SEND_FAILED;
2112 case FAIL: goto RESPONSE_FAILED;
2113 }
2114 }
2115 }
2116 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2117
2118 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2119 message-specific. */
2120
2121 sx->setting_up = FALSE;
2122
2123 #ifdef SUPPORT_I18N
2124 if (sx->addrlist->prop.utf8_msg)
2125 {
2126 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2127 && !sx->addrlist->prop.utf8_downcvt_maybe;
2128 DEBUG(D_transport) if (!sx->utf8_needed)
2129 debug_printf("utf8: %s downconvert\n",
2130 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2131 }
2132
2133 /* If this is an international message we need the host to speak SMTPUTF8 */
2134 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2135 {
2136 errno = ERRNO_UTF8_FWD;
2137 goto RESPONSE_FAILED;
2138 }
2139 #endif
2140
2141 return OK;
2142
2143
2144 {
2145 int code;
2146
2147 RESPONSE_FAILED:
2148 message = NULL;
2149 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2150 sx->buffer, &code, &message, &pass_message);
2151 goto FAILED;
2152
2153 SEND_FAILED:
2154 code = '4';
2155 message = US string_sprintf("send() to %s [%s] failed: %s",
2156 sx->host->name, sx->host->address, strerror(errno));
2157 sx->send_quit = FALSE;
2158 goto FAILED;
2159
2160 /* This label is jumped to directly when a TLS negotiation has failed,
2161 or was not done for a host for which it is required. Values will be set
2162 in message and errno, and setting_up will always be true. Treat as
2163 a temporary error. */
2164
2165 EHLOHELO_FAILED:
2166 code = '4';
2167 message = string_sprintf("Remote host closed connection in response to %s"
2168 " (EHLO response was: %s)", smtp_command, sx->buffer);
2169 sx->send_quit = FALSE;
2170 goto FAILED;
2171
2172 #ifdef SUPPORT_TLS
2173 TLS_FAILED:
2174 code = '4';
2175 goto FAILED;
2176 #endif
2177
2178 /* The failure happened while setting up the call; see if the failure was
2179 a 5xx response (this will either be on connection, or following HELO - a 5xx
2180 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2181 fail all addresses, as this host is never going to accept them. For other
2182 errors during setting up (timeouts or whatever), defer all addresses, and
2183 yield DEFER, so that the host is not tried again for a while.
2184
2185 XXX This peeking for another host feels like a layering violation. We want
2186 to note the host as unusable, but down here we shouldn't know if this was
2187 the last host to try for the addr(list). Perhaps the upper layer should be
2188 the one to do set_errno() ? The problem is that currently the addr is where
2189 errno etc. are stashed, but until we run out of hosts to try the errors are
2190 host-specific. Maybe we should enhance the host_item definition? */
2191
2192 FAILED:
2193 sx->ok = FALSE; /* For when reached by GOTO */
2194 set_errno(sx->addrlist, errno, message,
2195 sx->host->next
2196 ? DEFER
2197 : code == '5'
2198 #ifdef SUPPORT_I18N
2199 || errno == ERRNO_UTF8_FWD
2200 #endif
2201 ? FAIL : DEFER,
2202 pass_message, sx->host
2203 #ifdef EXPERIMENTAL_DSN_INFO
2204 , sx->smtp_greeting, sx->helo_response
2205 #endif
2206 );
2207 yield = DEFER;
2208 }
2209
2210
2211 SEND_QUIT:
2212
2213 if (sx->send_quit)
2214 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2215
2216 #ifdef SUPPORT_TLS
2217 tls_close(FALSE, TRUE);
2218 #endif
2219
2220 /* Close the socket, and return the appropriate value, first setting
2221 works because the NULL setting is passed back to the calling process, and
2222 remote_max_parallel is forced to 1 when delivering over an existing connection,
2223 */
2224
2225 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2226 if (sx->send_quit)
2227 {
2228 shutdown(sx->outblock.sock, SHUT_WR);
2229 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2230 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2231 rc--; /* drain socket */
2232 sx->send_quit = FALSE;
2233 }
2234 (void)close(sx->inblock.sock);
2235 sx->inblock.sock = sx->outblock.sock = -1;
2236
2237 #ifndef DISABLE_EVENT
2238 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2239 #endif
2240
2241 continue_transport = NULL;
2242 continue_hostname = NULL;
2243 return yield;
2244 }
2245
2246
2247
2248
2249 /* Create the string of options that will be appended to the MAIL FROM:
2250 in the connection context buffer */
2251
2252 static int
2253 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2254 {
2255 uschar * p = sx->buffer;
2256 address_item * addr;
2257 int address_count;
2258
2259 *p = 0;
2260
2261 /* If we know the receiving MTA supports the SIZE qualification,
2262 send it, adding something to the message size to allow for imprecision
2263 and things that get added en route. Exim keeps the number of lines
2264 in a message, so we can give an accurate value for the original message, but we
2265 need some additional to handle added headers. (Double "." characters don't get
2266 included in the count.) */
2267
2268 if (sx->peer_offered & PEER_OFFERED_SIZE)
2269 {
2270 /*XXX problem here under spool_files_wireformat?
2271 Or just forget about lines? Or inflate by a fixed proportion? */
2272
2273 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2274 while (*p) p++;
2275 }
2276
2277 #ifndef DISABLE_PRDR
2278 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2279 request that */
2280
2281 sx->prdr_active = FALSE;
2282 if (sx->peer_offered & PEER_OFFERED_PRDR)
2283 for (addr = addrlist; addr; addr = addr->next)
2284 if (addr->transport_return == PENDING_DEFER)
2285 {
2286 for (addr = addr->next; addr; addr = addr->next)
2287 if (addr->transport_return == PENDING_DEFER)
2288 { /* at least two recipients to send */
2289 sx->prdr_active = TRUE;
2290 sprintf(CS p, " PRDR"); p += 5;
2291 break;
2292 }
2293 break;
2294 }
2295 #endif
2296
2297 #ifdef SUPPORT_I18N
2298 /* If it supports internationalised messages, and this meesage need that,
2299 request it */
2300
2301 if ( sx->peer_offered & PEER_OFFERED_UTF8
2302 && addrlist->prop.utf8_msg
2303 && !addrlist->prop.utf8_downcvt
2304 )
2305 Ustrcpy(p, " SMTPUTF8"), p += 9;
2306 #endif
2307
2308 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2309 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2310 addr && address_count < sx->max_rcpt;
2311 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2312 {
2313 address_count++;
2314 if (!(addr->dsn_flags & rf_dsnlasthop))
2315 {
2316 sx->dsn_all_lasthop = FALSE;
2317 break;
2318 }
2319 }
2320
2321 /* Add any DSN flags to the mail command */
2322
2323 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2324 {
2325 if (dsn_ret == dsn_ret_hdrs)
2326 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2327 else if (dsn_ret == dsn_ret_full)
2328 { Ustrcpy(p, " RET=FULL"); p += 9; }
2329
2330 if (dsn_envid)
2331 {
2332 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2333 while (*p) p++;
2334 }
2335 }
2336
2337 /* If an authenticated_sender override has been specified for this transport
2338 instance, expand it. If the expansion is forced to fail, and there was already
2339 an authenticated_sender for this message, the original value will be used.
2340 Other expansion failures are serious. An empty result is ignored, but there is
2341 otherwise no check - this feature is expected to be used with LMTP and other
2342 cases where non-standard addresses (e.g. without domains) might be required. */
2343
2344 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2345 return ERROR;
2346
2347 return OK;
2348 }
2349
2350
2351 static void
2352 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2353 {
2354 uschar * p = sx->buffer;
2355 *p = 0;
2356
2357 /* Add any DSN flags to the rcpt command */
2358
2359 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2360 {
2361 if (addr->dsn_flags & rf_dsnflags)
2362 {
2363 int i;
2364 BOOL first = TRUE;
2365
2366 Ustrcpy(p, " NOTIFY=");
2367 while (*p) p++;
2368 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2369 {
2370 if (!first) *p++ = ',';
2371 first = FALSE;
2372 Ustrcpy(p, rf_names[i]);
2373 while (*p) p++;
2374 }
2375 }
2376
2377 if (addr->dsn_orcpt)
2378 {
2379 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2380 addr->dsn_orcpt);
2381 while (*p) p++;
2382 }
2383 }
2384 }
2385
2386
2387
2388 /*
2389 Return:
2390 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2391 -1 MAIL response error
2392 -2 any non-MAIL read i/o error
2393 -3 non-MAIL response timeout
2394 -4 internal error; channel still usable
2395 -5 transmit failed
2396 */
2397
2398 int
2399 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2400 {
2401 address_item * addr;
2402 int address_count;
2403 int rc;
2404
2405 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2406 {
2407 *yield = ERROR;
2408 return -4;
2409 }
2410
2411 /* From here until we send the DATA command, we can make use of PIPELINING
2412 if the server host supports it. The code has to be able to check the responses
2413 at any point, for when the buffer fills up, so we write it totally generally.
2414 When PIPELINING is off, each command written reports that it has flushed the
2415 buffer. */
2416
2417 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2418
2419 {
2420 uschar * s = sx->from_addr;
2421 #ifdef SUPPORT_I18N
2422 uschar * errstr = NULL;
2423
2424 /* If we must downconvert, do the from-address here. Remember we had to
2425 for the to-addresses (done below), and also (ugly) for re-doing when building
2426 the delivery log line. */
2427
2428 if ( sx->addrlist->prop.utf8_msg
2429 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2430 )
2431 {
2432 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2433 {
2434 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2435 *yield = ERROR;
2436 return -4;
2437 }
2438 setflag(sx->addrlist, af_utf8_downcvt);
2439 }
2440 #endif
2441
2442 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2443 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2444 }
2445
2446 mail_command = string_copy(big_buffer); /* Save for later error message */
2447
2448 switch(rc)
2449 {
2450 case -1: /* Transmission error */
2451 return -5;
2452
2453 case +1: /* Cmd was sent */
2454 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2455 sx->ob->command_timeout))
2456 {
2457 if (errno == 0 && sx->buffer[0] == '4')
2458 {
2459 errno = ERRNO_MAIL4XX;
2460 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2461 }
2462 return -1;
2463 }
2464 sx->pending_MAIL = FALSE;
2465 break;
2466
2467 /* otherwise zero: command queued for pipeline */
2468 }
2469
2470 /* Pass over all the relevant recipient addresses for this host, which are the
2471 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2472 several before we have to read the responses for those seen so far. This
2473 checking is done by a subroutine because it also needs to be done at the end.
2474 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2475 the next one if not all are sent.
2476
2477 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2478 last address because we want to abort if any recipients have any kind of
2479 problem, temporary or permanent. We know that all recipient addresses will have
2480 the PENDING_DEFER status, because only one attempt is ever made, and we know
2481 that max_rcpt will be large, so all addresses will be done at once.
2482
2483 For verify we flush the pipeline after any (the only) rcpt address. */
2484
2485 for (addr = sx->first_addr, address_count = 0;
2486 addr && address_count < sx->max_rcpt;
2487 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2488 {
2489 int count;
2490 BOOL no_flush;
2491 uschar * rcpt_addr;
2492
2493 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2494 ? dsn_support_yes : dsn_support_no;
2495
2496 address_count++;
2497 no_flush = pipelining_active && !sx->verify
2498 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2499
2500 build_rcptcmd_options(sx, addr);
2501
2502 /* Now send the RCPT command, and process outstanding responses when
2503 necessary. After a timeout on RCPT, we just end the function, leaving the
2504 yield as OK, because this error can often mean that there is a problem with
2505 just one address, so we don't want to delay the host. */
2506
2507 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2508
2509 #ifdef SUPPORT_I18N
2510 if ( testflag(sx->addrlist, af_utf8_downcvt)
2511 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2512 )
2513 {
2514 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2515 errno = ERRNO_EXPANDFAIL;
2516 return -5; /*XXX too harsh? */
2517 }
2518 #endif
2519
2520 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2521 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2522
2523 if (count < 0) return -5;
2524 if (count > 0)
2525 {
2526 switch(sync_responses(sx, count, 0))
2527 {
2528 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2529 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2530 break;
2531
2532 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2533 if (!sx->lmtp) /* can't tell about progress yet */
2534 sx->completed_addr = TRUE;
2535 case 0: /* No 2xx or 5xx, but no probs */
2536 break;
2537
2538 case -1: return -3; /* Timeout on RCPT */
2539 case -2: return -2; /* non-MAIL read i/o error */
2540 default: return -1; /* any MAIL error */
2541 }
2542 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2543 }
2544 } /* Loop for next address */
2545
2546 sx->next_addr = addr;
2547 return 0;
2548 }
2549
2550
2551 #ifdef SUPPORT_TLS
2552 /*****************************************************
2553 * Proxy TLS connection for another transport process *
2554 ******************************************************/
2555 /*
2556 Use the given buffer as a staging area, and select on both the given fd
2557 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2558 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2559 under a timeout.
2560
2561 Arguments:
2562 buf space to use for buffering
2563 bufsiz size of buffer
2564 proxy_fd comms to proxied process
2565 timeout per-read timeout, seconds
2566 */
2567
2568 void
2569 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2570 {
2571 fd_set rfds, efds;
2572 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2573 int rc, i, fd_bits, nbytes;
2574
2575 set_process_info("proxying TLS connection for continued transport");
2576 FD_ZERO(&rfds);
2577 FD_SET(tls_out.active, &rfds);
2578 FD_SET(proxy_fd, &rfds);
2579
2580 for (fd_bits = 3; fd_bits; )
2581 {
2582 time_t time_left = timeout;
2583 time_t time_start = time(NULL);
2584
2585 /* wait for data */
2586 efds = rfds;
2587 do
2588 {
2589 struct timeval tv = { time_left, 0 };
2590
2591 rc = select(max_fd,
2592 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2593
2594 if (rc < 0 && errno == EINTR)
2595 if ((time_left -= time(NULL) - time_start) > 0) continue;
2596
2597 if (rc <= 0)
2598 {
2599 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2600 return;
2601 }
2602
2603 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2604 {
2605 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2606 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2607 return;
2608 }
2609 }
2610 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2611
2612 /* handle inbound data */
2613 if (FD_ISSET(tls_out.active, &rfds))
2614 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2615 {
2616 fd_bits &= ~1;
2617 FD_CLR(tls_out.active, &rfds);
2618 shutdown(proxy_fd, SHUT_WR);
2619 timeout = 5;
2620 }
2621 else
2622 {
2623 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2624 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2625 }
2626 else if (fd_bits & 1)
2627 FD_SET(tls_out.active, &rfds);
2628
2629 /* handle outbound data */
2630 if (FD_ISSET(proxy_fd, &rfds))
2631 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2632 {
2633 fd_bits = 0;
2634 tls_close(FALSE, TRUE);
2635 }
2636 else
2637 {
2638 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2639 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2640 return;
2641 }
2642 else if (fd_bits & 2)
2643 FD_SET(proxy_fd, &rfds);
2644 }
2645 }
2646 #endif
2647
2648
2649 /*************************************************
2650 * Deliver address list to given host *
2651 *************************************************/
2652
2653 /* If continue_hostname is not null, we get here only when continuing to
2654 deliver down an existing channel. The channel was passed as the standard
2655 input. TLS is never active on a passed channel; the previous process always
2656 closes it down before passing the connection on.
2657
2658 Otherwise, we have to make a connection to the remote host, and do the
2659 initial protocol exchange.
2660
2661 When running as an MUA wrapper, if the sender or any recipient is rejected,
2662 temporarily or permanently, we force failure for all recipients.
2663
2664 Arguments:
2665 addrlist chain of potential addresses to deliver; only those whose
2666 transport_return field is set to PENDING_DEFER are currently
2667 being processed; others should be skipped - they have either
2668 been delivered to an earlier host or IP address, or been
2669 failed by one of them.
2670 host host to deliver to
2671 host_af AF_INET or AF_INET6
2672 defport default TCP/IP port to use if host does not specify, in host
2673 byte order
2674 interface interface to bind to, or NULL
2675 tblock transport instance block
2676 message_defer set TRUE if yield is OK, but all addresses were deferred
2677 because of a non-recipient, non-host failure, that is, a
2678 4xx response to MAIL FROM, DATA, or ".". This is a defer
2679 that is specific to the message.
2680 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2681 a second attempt after TLS initialization fails
2682
2683 Returns: OK - the connection was made and the delivery attempted;
2684 the result for each address is in its data block.
2685 DEFER - the connection could not be made, or something failed
2686 while setting up the SMTP session, or there was a
2687 non-message-specific error, such as a timeout.
2688 ERROR - a filter command is specified for this transport,
2689 and there was a problem setting it up; OR helo_data
2690 or add_headers or authenticated_sender is specified
2691 for this transport, and the string failed to expand
2692 */
2693
2694 static int
2695 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2696 uschar *interface, transport_instance *tblock,
2697 BOOL *message_defer, BOOL suppress_tls)
2698 {
2699 address_item *addr;
2700 int yield = OK;
2701 int save_errno;
2702 int rc;
2703 time_t start_delivery_time = time(NULL);
2704
2705 BOOL pass_message = FALSE;
2706 uschar *message = NULL;
2707 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2708 uschar *p;
2709
2710 smtp_context sx;
2711
2712 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2713 *message_defer = FALSE;
2714
2715 sx.addrlist = addrlist;
2716 sx.host = host;
2717 sx.host_af = host_af,
2718 sx.port = defport;
2719 sx.interface = interface;
2720 sx.helo_data = NULL;
2721 sx.tblock = tblock;
2722 sx.verify = FALSE;
2723
2724 /* Get the channel set up ready for a message (MAIL FROM being the next
2725 SMTP command to send */
2726
2727 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2728 return rc;
2729
2730 /* If there is a filter command specified for this transport, we can now
2731 set it up. This cannot be done until the identify of the host is known. */
2732
2733 if (tblock->filter_command)
2734 {
2735 transport_filter_timeout = tblock->filter_timeout;
2736
2737 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2738 yield ERROR. */
2739
2740 if (!transport_set_up_command(&transport_filter_argv,
2741 tblock->filter_command, TRUE, DEFER, addrlist,
2742 string_sprintf("%.50s transport", tblock->name), NULL))
2743 {
2744 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2745 FALSE);
2746 yield = ERROR;
2747 goto SEND_QUIT;
2748 }
2749
2750 if ( transport_filter_argv
2751 && *transport_filter_argv
2752 && **transport_filter_argv
2753 && sx.peer_offered & PEER_OFFERED_CHUNKING
2754 )
2755 {
2756 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2757 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2758 }
2759 }
2760
2761 sx.first_addr = addrlist;
2762
2763 /* For messages that have more than the maximum number of envelope recipients,
2764 we want to send several transactions down the same SMTP connection. (See
2765 comments in deliver.c as to how this reconciles, heuristically, with
2766 remote_max_parallel.) This optimization was added to Exim after the following
2767 code was already working. The simplest way to put it in without disturbing the
2768 code was to use a goto to jump back to this point when there is another
2769 transaction to handle. */
2770
2771 SEND_MESSAGE:
2772 sx.from_addr = return_path;
2773 sx.sync_addr = sx.first_addr;
2774 sx.ok = FALSE;
2775 sx.send_rset = TRUE;
2776 sx.completed_addr = FALSE;
2777
2778
2779 /* If we are a continued-connection-after-verify the MAIL and RCPT
2780 commands were already sent; do not re-send but do mark the addrs as
2781 having been accepted up to RCPT stage. A traditional cont-conn
2782 always has a sequence number greater than one. */
2783
2784 if (continue_hostname && continue_sequence == 1)
2785 {
2786 address_item * addr;
2787
2788 sx.peer_offered = smtp_peer_options;
2789 sx.pending_MAIL = FALSE;
2790 sx.ok = TRUE;
2791 sx.next_addr = NULL;
2792
2793 for (addr = addrlist; addr; addr = addr->next)
2794 addr->transport_return = PENDING_OK;
2795 }
2796 else
2797 {
2798 /* Initiate a message transfer. */
2799
2800 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2801 {
2802 case 0: break;
2803 case -1: case -2: goto RESPONSE_FAILED;
2804 case -3: goto END_OFF;
2805 case -4: goto SEND_QUIT;
2806 default: goto SEND_FAILED;
2807 }
2808
2809 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2810 permanently or temporarily. We should have flushed and synced after the last
2811 RCPT. */
2812
2813 if (mua_wrapper)
2814 {
2815 address_item * a;
2816 unsigned cnt;
2817
2818 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2819 if (a->transport_return != PENDING_OK)
2820 {
2821 /*XXX could we find a better errno than 0 here? */
2822 set_errno_nohost(addrlist, 0, a->message, FAIL,
2823 testflag(a, af_pass_message));
2824 sx.ok = FALSE;
2825 break;
2826 }
2827 }
2828 }
2829
2830 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2831 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2832 have a good recipient buffered up if we are pipelining. We don't want to waste
2833 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2834 are pipelining. The responses are all handled by sync_responses().
2835 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2836 to send is. */
2837
2838 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2839 && (sx.ok || (pipelining_active && !mua_wrapper)))
2840 {
2841 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2842
2843 if (count < 0) goto SEND_FAILED;
2844 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2845 {
2846 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2847 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2848 break;
2849
2850 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2851 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2852 case 0: break; /* No 2xx or 5xx, but no probs */
2853
2854 case -1: goto END_OFF; /* Timeout on RCPT */
2855 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2856 }
2857 pipelining_active = FALSE;
2858 data_command = string_copy(big_buffer); /* Save for later error message */
2859 }
2860
2861 /* If there were no good recipients (but otherwise there have been no
2862 problems), just set ok TRUE, since we have handled address-specific errors
2863 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2864 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2865 well as body. Set the appropriate timeout value to be used for each chunk.
2866 (Haven't been able to make it work using select() for writing yet.) */
2867
2868 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2869 {
2870 /* Save the first address of the next batch. */
2871 sx.first_addr = sx.next_addr;
2872
2873 sx.ok = TRUE;
2874 }
2875 else
2876 {
2877 transport_ctx tctx = {
2878 sx.inblock.sock,
2879 tblock,
2880 addrlist,
2881 US".", US"..", /* Escaping strings */
2882 topt_use_crlf | topt_escape_headers
2883 | (tblock->body_only ? topt_no_headers : 0)
2884 | (tblock->headers_only ? topt_no_body : 0)
2885 | (tblock->return_path_add ? topt_add_return_path : 0)
2886 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2887 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2888 };
2889
2890 /* If using CHUNKING we need a callback from the generic transport
2891 support to us, for the sending of BDAT smtp commands and the reaping
2892 of responses. The callback needs a whole bunch of state so set up
2893 a transport-context structure to be passed around. */
2894
2895 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2896 {
2897 tctx.check_string = tctx.escape_string = NULL;
2898 tctx.options |= topt_use_bdat;
2899 tctx.chunk_cb = smtp_chunk_cmd_callback;
2900 sx.pending_BDAT = FALSE;
2901 sx.good_RCPT = sx.ok;
2902 sx.cmd_count = 0;
2903 tctx.smtp_context = &sx;
2904 }
2905 else
2906 tctx.options |= topt_end_dot;
2907
2908 /* Save the first address of the next batch. */
2909 sx.first_addr = sx.next_addr;
2910
2911 /* Responses from CHUNKING commands go in buffer. Otherwise,
2912 there has not been a response. */
2913
2914 sx.buffer[0] = 0;
2915
2916 sigalrm_seen = FALSE;
2917 transport_write_timeout = sx.ob->data_timeout;
2918 smtp_command = US"sending data block"; /* For error messages */
2919 DEBUG(D_transport|D_v)
2920 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2921 debug_printf(" will write message using CHUNKING\n");
2922 else
2923 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2924 transport_count = 0;
2925
2926 #ifndef DISABLE_DKIM
2927 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2928 #else
2929 sx.ok = transport_write_message(&tctx, 0);
2930 #endif
2931
2932 /* transport_write_message() uses write() because it is called from other
2933 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2934 it can exit with "Broken pipe" as its error. This really means that the
2935 socket got closed at the far end. */
2936
2937 transport_write_timeout = 0; /* for subsequent transports */
2938
2939 /* Failure can either be some kind of I/O disaster (including timeout),
2940 or the failure of a transport filter or the expansion of added headers.
2941 Or, when CHUNKING, it can be a protocol-detected failure. */
2942
2943 if (!sx.ok)
2944 if (message) goto SEND_FAILED;
2945 else goto RESPONSE_FAILED;
2946
2947 /* We used to send the terminating "." explicitly here, but because of
2948 buffering effects at both ends of TCP/IP connections, you don't gain
2949 anything by keeping it separate, so it might as well go in the final
2950 data buffer for efficiency. This is now done by setting the topt_end_dot
2951 flag above. */
2952
2953 smtp_command = US"end of data";
2954
2955 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2956 {
2957 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2958 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2959 {
2960 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2961 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2962 break;
2963
2964 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2965 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2966 case 0: break; /* No 2xx or 5xx, but no probs */
2967
2968 case -1: goto END_OFF; /* Timeout on RCPT */
2969 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2970 }
2971 }
2972
2973 #ifndef DISABLE_PRDR
2974 /* For PRDR we optionally get a partial-responses warning
2975 * followed by the individual responses, before going on with
2976 * the overall response. If we don't get the warning then deal
2977 * with per non-PRDR. */
2978 if(sx.prdr_active)
2979 {
2980 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2981 sx.ob->final_timeout);
2982 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2983 {
2984 case '2': sx.prdr_active = FALSE;
2985 sx.ok = TRUE;
2986 break;
2987 case '4': errno = ERRNO_DATA4XX;
2988 addrlist->more_errno |=
2989 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2990 break;
2991 }
2992 }
2993 else
2994 #endif
2995
2996 /* For non-PRDR SMTP, we now read a single response that applies to the
2997 whole message. If it is OK, then all the addresses have been delivered. */
2998
2999 if (!sx.lmtp)
3000 {
3001 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3002 sx.ob->final_timeout);
3003 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3004 {
3005 errno = ERRNO_DATA4XX;
3006 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3007 }
3008 }
3009
3010 /* For LMTP, we get back a response for every RCPT command that we sent;
3011 some may be accepted and some rejected. For those that get a response, their
3012 status is fixed; any that are accepted have been handed over, even if later
3013 responses crash - at least, that's how I read RFC 2033.
3014
3015 If all went well, mark the recipient addresses as completed, record which
3016 host/IPaddress they were delivered to, and cut out RSET when sending another
3017 message down the same channel. Write the completed addresses to the journal
3018 now so that they are recorded in case there is a crash of hardware or
3019 software before the spool gets updated. Also record the final SMTP
3020 confirmation if needed (for SMTP only). */
3021
3022 if (sx.ok)
3023 {
3024 int flag = '=';
3025 int delivery_time = (int)(time(NULL) - start_delivery_time);
3026 int len;
3027 uschar *conf = NULL;
3028
3029 sx.send_rset = FALSE;
3030 pipelining_active = FALSE;
3031
3032 /* Set up confirmation if needed - applies only to SMTP */
3033
3034 if (
3035 #ifdef DISABLE_EVENT
3036 LOGGING(smtp_confirmation) &&
3037 #endif
3038 !sx.lmtp
3039 )
3040 {
3041 const uschar *s = string_printing(sx.buffer);
3042 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3043 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3044 }
3045
3046 /* Process all transported addresses - for LMTP or PRDR, read a status for
3047 each one. */
3048
3049 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3050 {
3051 if (addr->transport_return != PENDING_OK) continue;
3052
3053 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3054 remaining addresses. Otherwise, it's a return code for just the one
3055 address. For temporary errors, add a retry item for the address so that
3056 it doesn't get tried again too soon. */
3057
3058 #ifndef DISABLE_PRDR
3059 if (sx.lmtp || sx.prdr_active)
3060 #else
3061 if (sx.lmtp)
3062 #endif
3063 {
3064 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3065 sx.ob->final_timeout))
3066 {
3067 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3068 addr->message = string_sprintf(
3069 #ifndef DISABLE_PRDR
3070 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3071 #else
3072 "LMTP error after %s: %s",
3073 #endif
3074 data_command, string_printing(sx.buffer));
3075 setflag(addr, af_pass_message); /* Allow message to go to user */
3076 if (sx.buffer[0] == '5')
3077 addr->transport_return = FAIL;
3078 else
3079 {
3080 errno = ERRNO_DATA4XX;
3081 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3082 addr->transport_return = DEFER;
3083 #ifndef DISABLE_PRDR
3084 if (!sx.prdr_active)
3085 #endif
3086 retry_add_item(addr, addr->address_retry_key, 0);
3087 }
3088 continue;
3089 }
3090 sx.completed_addr = TRUE; /* NOW we can set this flag */
3091 if (LOGGING(smtp_confirmation))
3092 {
3093 const uschar *s = string_printing(sx.buffer);
3094 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3095 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3096 }
3097 }
3098
3099 /* SMTP, or success return from LMTP for this address. Pass back the
3100 actual host that was used. */
3101
3102 addr->transport_return = OK;
3103 addr->more_errno = delivery_time;
3104 addr->host_used = host;
3105 addr->special_action = flag;
3106 addr->message = conf;
3107 #ifndef DISABLE_PRDR
3108 if (sx.prdr_active) addr->flags |= af_prdr_used;
3109 #endif
3110 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3111 flag = '-';
3112
3113 #ifndef DISABLE_PRDR
3114 if (!sx.prdr_active)
3115 #endif
3116 {
3117 /* Update the journal. For homonymic addresses, use the base address plus
3118 the transport name. See lots of comments in deliver.c about the reasons
3119 for the complications when homonyms are involved. Just carry on after
3120 write error, as it may prove possible to update the spool file later. */
3121
3122 if (testflag(addr, af_homonym))
3123 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3124 else
3125 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3126
3127 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3128 len = Ustrlen(CS sx.buffer);
3129 if (write(journal_fd, sx.buffer, len) != len)
3130 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3131 "%s: %s", sx.buffer, strerror(errno));
3132 }
3133 }
3134
3135 #ifndef DISABLE_PRDR
3136 if (sx.prdr_active)
3137 {
3138 /* PRDR - get the final, overall response. For any non-success
3139 upgrade all the address statuses. */
3140 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3141 sx.ob->final_timeout);
3142 if (!sx.ok)
3143 {
3144 if(errno == 0 && sx.buffer[0] == '4')
3145 {
3146 errno = ERRNO_DATA4XX;
3147 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3148 }
3149 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3150 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3151 addr->transport_return = PENDING_OK; /* allow set_errno action */
3152 goto RESPONSE_FAILED;
3153 }
3154
3155 /* Update the journal, or setup retry. */
3156 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3157 if (addr->transport_return == OK)
3158 {
3159 if (testflag(addr, af_homonym))
3160 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3161 else
3162 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3163
3164 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3165 len = Ustrlen(CS sx.buffer);
3166 if (write(journal_fd, sx.buffer, len) != len)
3167 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3168 "%s: %s", sx.buffer, strerror(errno));
3169 }
3170 else if (addr->transport_return == DEFER)
3171 retry_add_item(addr, addr->address_retry_key, -2);
3172 }
3173 #endif
3174
3175 /* Ensure the journal file is pushed out to disk. */
3176
3177 if (EXIMfsync(journal_fd) < 0)
3178 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3179 strerror(errno));
3180 }
3181 }
3182
3183
3184 /* Handle general (not specific to one address) failures here. The value of ok
3185 is used to skip over this code on the falling through case. A timeout causes a
3186 deferral. Other errors may defer or fail according to the response code, and
3187 may set up a special errno value, e.g. after connection chopped, which is
3188 assumed if errno == 0 and there is no text in the buffer. If control reaches
3189 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3190 the problem is not related to this specific message. */
3191
3192 if (!sx.ok)
3193 {
3194 int code, set_rc;
3195 uschar * set_message;
3196
3197 RESPONSE_FAILED:
3198 {
3199 save_errno = errno;
3200 message = NULL;
3201 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3202 sx.buffer, &code, &message, &pass_message);
3203 goto FAILED;
3204 }
3205
3206 SEND_FAILED:
3207 {
3208 save_errno = errno;
3209 code = '4';
3210 message = string_sprintf("send() to %s [%s] failed: %s",
3211 host->name, host->address, message ? message : US strerror(save_errno));
3212 sx.send_quit = FALSE;
3213 goto FAILED;
3214 }
3215
3216 FAILED:
3217 {
3218 BOOL message_error;
3219
3220 sx.ok = FALSE; /* For when reached by GOTO */
3221 set_message = message;
3222
3223 /* We want to handle timeouts after MAIL or "." and loss of connection after
3224 "." specially. They can indicate a problem with the sender address or with
3225 the contents of the message rather than a real error on the connection. These
3226 cases are treated in the same way as a 4xx response. This next bit of code
3227 does the classification. */
3228
3229 switch(save_errno)
3230 {
3231 case 0:
3232 case ERRNO_MAIL4XX:
3233 case ERRNO_DATA4XX:
3234 message_error = TRUE;
3235 break;
3236
3237 case ETIMEDOUT:
3238 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3239 Ustrncmp(smtp_command,"end ",4) == 0;
3240 break;
3241
3242 case ERRNO_SMTPCLOSED:
3243 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3244 break;
3245
3246 default:
3247 message_error = FALSE;
3248 break;
3249 }
3250
3251 /* Handle the cases that are treated as message errors. These are:
3252
3253 (a) negative response or timeout after MAIL
3254 (b) negative response after DATA
3255 (c) negative response or timeout or dropped connection after "."
3256 (d) utf8 support required and not offered
3257
3258 It won't be a negative response or timeout after RCPT, as that is dealt
3259 with separately above. The action in all cases is to set an appropriate
3260 error code for all the addresses, but to leave yield set to OK because the
3261 host itself has not failed. Of course, it might in practice have failed
3262 when we've had a timeout, but if so, we'll discover that at the next
3263 delivery attempt. For a temporary error, set the message_defer flag, and
3264 write to the logs for information if this is not the last host. The error
3265 for the last host will be logged as part of the address's log line. */
3266
3267 if (message_error)
3268 {
3269 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3270
3271 /* If there's an errno, the message contains just the identity of
3272 the host. */
3273
3274 if (code == '5')
3275 set_rc = FAIL;
3276 else /* Anything other than 5 is treated as temporary */
3277 {
3278 set_rc = DEFER;
3279 if (save_errno > 0)
3280 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3281 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3282 msglog_line(host, message);
3283 *message_defer = TRUE;
3284 }
3285 }
3286
3287 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3288 ".", or some other transportation error. We defer all addresses and yield
3289 DEFER, except for the case of failed add_headers expansion, or a transport
3290 filter failure, when the yield should be ERROR, to stop it trying other
3291 hosts. */
3292
3293 else
3294 {
3295 set_rc = DEFER;
3296 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3297 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3298 }
3299 }
3300
3301 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3302 #ifdef EXPERIMENTAL_DSN_INFO
3303 , sx.smtp_greeting, sx.helo_response
3304 #endif
3305 );
3306 }
3307
3308
3309 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3310 SMTP session tidily. However, if there were too many addresses to send in one
3311 message (indicated by first_addr being non-NULL) we want to carry on with the
3312 rest of them. Also, it is desirable to send more than one message down the SMTP
3313 connection if there are several waiting, provided we haven't already sent so
3314 many as to hit the configured limit. The function transport_check_waiting looks
3315 for a waiting message and returns its id. Then transport_pass_socket tries to
3316 set up a continued delivery by passing the socket on to another process. The
3317 variable send_rset is FALSE if a message has just been successfully transfered.
3318
3319 If we are already sending down a continued channel, there may be further
3320 addresses not yet delivered that are aimed at the same host, but which have not
3321 been passed in this run of the transport. In this case, continue_more will be
3322 true, and all we should do is send RSET if necessary, and return, leaving the
3323 channel open.
3324
3325 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3326 do not want to continue with other messages down the same channel, because that
3327 can lead to looping between two or more messages, all with the same,
3328 temporarily failing address(es). [The retry information isn't updated yet, so
3329 new processes keep on trying.] We probably also don't want to try more of this
3330 message's addresses either.
3331
3332 If we have started a TLS session, we have to end it before passing the
3333 connection to a new process. However, not all servers can handle this (Exim
3334 can), so we do not pass such a connection on if the host matches
3335 hosts_nopass_tls. */
3336
3337 DEBUG(D_transport)
3338 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3339 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3340 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3341
3342 if (sx.completed_addr && sx.ok && sx.send_quit)
3343 {
3344 BOOL more;
3345 smtp_compare_t t_compare;
3346
3347 t_compare.tblock = tblock;
3348 t_compare.current_sender_address = sender_address;
3349
3350 if ( sx.first_addr != NULL
3351 || continue_more
3352 || (
3353 #ifdef SUPPORT_TLS
3354 ( tls_out.active < 0 && !continue_proxy_cipher
3355 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3356 )
3357 &&
3358 #endif
3359 transport_check_waiting(tblock->name, host->name,
3360 tblock->connection_max_messages, new_message_id, &more,
3361 (oicf)smtp_are_same_identities, (void*)&t_compare)
3362 ) )
3363 {
3364 uschar *msg;
3365 BOOL pass_message;
3366
3367 if (sx.send_rset)
3368 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3369 {
3370 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3371 host->address, strerror(errno));
3372 sx.send_quit = FALSE;
3373 }
3374 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3375 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3376 {
3377 int code;
3378 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3379 &pass_message);
3380 if (!sx.send_quit)
3381 {
3382 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3383 host->name, host->address, msg);
3384 }
3385 }
3386
3387 /* Either RSET was not needed, or it succeeded */
3388
3389 if (sx.ok)
3390 {
3391 int pfd[2];
3392 int socket_fd = sx.inblock.sock;
3393
3394
3395 if (sx.first_addr != NULL) /* More addresses still to be sent */
3396 { /* in this run of the transport */
3397 continue_sequence++; /* Causes * in logging */
3398 goto SEND_MESSAGE;
3399 }
3400
3401 /* Unless caller said it already has more messages listed for this host,
3402 pass the connection on to a new Exim process (below, the call to
3403 transport_pass_socket). If the caller has more ready, just return with
3404 the connection still open. */
3405
3406 #ifdef SUPPORT_TLS
3407 if (tls_out.active >= 0)
3408 if ( continue_more
3409 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3410 {
3411 /* Before passing the socket on, or returning to caller with it still
3412 open, we must shut down TLS. Not all MTAs allow for the continuation
3413 of the SMTP session when TLS is shut down. We test for this by sending
3414 a new EHLO. If we don't get a good response, we don't attempt to pass
3415 the socket on. */
3416
3417 tls_close(FALSE, TRUE);
3418 smtp_peer_options = smtp_peer_options_wrap;
3419 sx.ok = !sx.smtps
3420 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3421 "EHLO %s\r\n", sx.helo_data) >= 0
3422 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3423 '2', sx.ob->command_timeout);
3424
3425 if (sx.ok && continue_more)
3426 return yield; /* More addresses for another run */
3427 }
3428 else
3429 {
3430 /* Set up a pipe for proxying TLS for the new transport process */
3431
3432 smtp_peer_options |= PEER_OFFERED_TLS;
3433 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3434 socket_fd = pfd[1];
3435 else
3436 set_errno(sx.first_addr, errno, US"internal allocation problem",
3437 DEFER, FALSE, host
3438 # ifdef EXPERIMENTAL_DSN_INFO
3439 , sx.smtp_greeting, sx.helo_response
3440 # endif
3441 );
3442 }
3443 else
3444 #endif
3445 if (continue_more)
3446 return yield; /* More addresses for another run */
3447
3448 /* If the socket is successfully passed, we mustn't send QUIT (or
3449 indeed anything!) from here. */
3450
3451 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3452 propagate it from the initial
3453 */
3454 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3455 host->address, new_message_id, socket_fd))
3456 {
3457 sx.send_quit = FALSE;
3458
3459 /* If TLS is still active, we need to proxy it for the transport we
3460 just passed the baton to. Fork a child to to do it, and return to
3461 get logging done asap. Which way to place the work makes assumptions
3462 about post-fork prioritisation which may not hold on all platforms. */
3463 #ifdef SUPPORT_TLS
3464 if (tls_out.active >= 0)
3465 {
3466 int pid = fork();
3467 if (pid > 0) /* parent */
3468 {
3469 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3470 close(pfd[0]);
3471 waitpid(pid, NULL, 0);
3472 tls_close(FALSE, FALSE);
3473 (void)close(sx.inblock.sock);
3474 continue_transport = NULL;
3475 continue_hostname = NULL;
3476 return yield;
3477 }
3478 else if (pid == 0) /* child; fork again to disconnect totally */
3479 {
3480 close(pfd[1]);
3481 if ((pid = fork()))
3482 {
3483 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3484 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3485 }
3486 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3487 exim_exit(0);
3488 }
3489 }
3490 #endif
3491 }
3492 }
3493
3494 /* If RSET failed and there are addresses left, they get deferred. */
3495 else
3496 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3497 #ifdef EXPERIMENTAL_DSN_INFO
3498 , sx.smtp_greeting, sx.helo_response
3499 #endif
3500 );
3501 }
3502 }
3503
3504 /* End off tidily with QUIT unless the connection has died or the socket has
3505 been passed to another process. There has been discussion on the net about what
3506 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3507 to wait for a response, but on the other hand, there isn't anything one can do
3508 with an error response, other than log it. Exim used to do that. However,
3509 further discussion suggested that it is positively advantageous not to wait for
3510 the response, but to close the session immediately. This is supposed to move
3511 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3512 load from the server. (Hosts that are both servers and clients may not see much
3513 difference, of course.) Further discussion indicated that this was safe to do
3514 on Unix systems which have decent implementations of TCP/IP that leave the
3515 connection around for a while (TIME_WAIT) after the application has gone away.
3516 This enables the response sent by the server to be properly ACKed rather than
3517 timed out, as can happen on broken TCP/IP implementations on other OS.
3518
3519 This change is being made on 31-Jul-98. After over a year of trouble-free
3520 operation, the old commented-out code was removed on 17-Sep-99. */
3521
3522 SEND_QUIT:
3523 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3524
3525 END_OFF:
3526
3527 #ifdef SUPPORT_TLS
3528 tls_close(FALSE, TRUE);
3529 #endif
3530
3531 /* Close the socket, and return the appropriate value, first setting
3532 works because the NULL setting is passed back to the calling process, and
3533 remote_max_parallel is forced to 1 when delivering over an existing connection,
3534
3535 If all went well and continue_more is set, we shouldn't actually get here if
3536 there are further addresses, as the return above will be taken. However,
3537 writing RSET might have failed, or there may be other addresses whose hosts are
3538 specified in the transports, and therefore not visible at top level, in which
3539 case continue_more won't get set. */
3540
3541 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3542 if (sx.send_quit)
3543 {
3544 shutdown(sx.outblock.sock, SHUT_WR);
3545 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3546 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3547 rc--; /* drain socket */
3548 }
3549 (void)close(sx.inblock.sock);
3550
3551 #ifndef DISABLE_EVENT
3552 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3553 #endif
3554
3555 continue_transport = NULL;
3556 continue_hostname = NULL;
3557 return yield;
3558 }
3559
3560
3561
3562
3563 /*************************************************
3564 * Closedown entry point *
3565 *************************************************/
3566
3567 /* This function is called when exim is passed an open smtp channel
3568 from another incarnation, but the message which it has been asked
3569 to deliver no longer exists. The channel is on stdin.
3570
3571 We might do fancy things like looking for another message to send down
3572 the channel, but if the one we sought has gone, it has probably been
3573 delivered by some other process that itself will seek further messages,
3574 so just close down our connection.
3575
3576 Argument: pointer to the transport instance block
3577 Returns: nothing
3578 */
3579
3580 void
3581 smtp_transport_closedown(transport_instance *tblock)
3582 {
3583 smtp_transport_options_block *ob =
3584 (smtp_transport_options_block *)tblock->options_block;
3585 smtp_inblock inblock;
3586 smtp_outblock outblock;
3587 uschar buffer[256];
3588 uschar inbuffer[4096];
3589 uschar outbuffer[16];
3590
3591 inblock.sock = fileno(stdin);
3592 inblock.buffer = inbuffer;
3593 inblock.buffersize = sizeof(inbuffer);
3594 inblock.ptr = inbuffer;
3595 inblock.ptrend = inbuffer;
3596
3597 outblock.sock = inblock.sock;
3598 outblock.buffersize = sizeof(outbuffer);
3599 outblock.buffer = outbuffer;
3600 outblock.ptr = outbuffer;
3601 outblock.cmd_count = 0;
3602 outblock.authenticating = FALSE;
3603
3604 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3605 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3606 ob->command_timeout);
3607 (void)close(inblock.sock);
3608 }
3609
3610
3611
3612 /*************************************************
3613 * Prepare addresses for delivery *
3614 *************************************************/
3615
3616 /* This function is called to flush out error settings from previous delivery
3617 attempts to other hosts. It also records whether we got here via an MX record
3618 or not in the more_errno field of the address. We are interested only in
3619 addresses that are still marked DEFER - others may have got delivered to a
3620 previously considered IP address. Set their status to PENDING_DEFER to indicate
3621 which ones are relevant this time.
3622
3623 Arguments:
3624 addrlist the list of addresses
3625 host the host we are delivering to
3626
3627 Returns: the first address for this delivery
3628 */
3629
3630 static address_item *
3631 prepare_addresses(address_item *addrlist, host_item *host)
3632 {
3633 address_item *first_addr = NULL;
3634 address_item *addr;
3635 for (addr = addrlist; addr; addr = addr->next)
3636 if (addr->transport_return == DEFER)
3637 {
3638 if (!first_addr) first_addr = addr;
3639 addr->transport_return = PENDING_DEFER;
3640 addr->basic_errno = 0;
3641 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3642 addr->message = NULL;
3643 #ifdef SUPPORT_TLS
3644 addr->cipher = NULL;
3645 addr->ourcert = NULL;
3646 addr->peercert = NULL;
3647 addr->peerdn = NULL;
3648 addr->ocsp = OCSP_NOT_REQ;
3649 #endif
3650 #ifdef EXPERIMENTAL_DSN_INFO
3651 addr->smtp_greeting = NULL;
3652 addr->helo_response = NULL;
3653 #endif
3654 }
3655 return first_addr;
3656 }
3657
3658
3659
3660 /*************************************************
3661 * Main entry point *
3662 *************************************************/
3663
3664 /* See local README for interface details. As this is a remote transport, it is
3665 given a chain of addresses to be delivered in one connection, if possible. It
3666 always returns TRUE, indicating that each address has its own independent
3667 status set, except if there is a setting up problem, in which case it returns
3668 FALSE. */
3669
3670 BOOL
3671 smtp_transport_entry(
3672 transport_instance *tblock, /* data for this instantiation */
3673 address_item *addrlist) /* addresses we are working on */
3674 {
3675 int cutoff_retry;
3676 int defport;
3677 int hosts_defer = 0;
3678 int hosts_fail = 0;
3679 int hosts_looked_up = 0;
3680 int hosts_retry = 0;
3681 int hosts_serial = 0;
3682 int hosts_total = 0;
3683 int total_hosts_tried = 0;
3684 address_item *addr;
3685 BOOL expired = TRUE;
3686 uschar *expanded_hosts = NULL;
3687 uschar *pistring;
3688 uschar *tid = string_sprintf("%s transport", tblock->name);
3689 smtp_transport_options_block *ob =
3690 (smtp_transport_options_block *)(tblock->options_block);
3691 host_item *hostlist = addrlist->host_list;
3692 host_item *host = NULL;
3693
3694 DEBUG(D_transport)
3695 {
3696 debug_printf("%s transport entered\n", tblock->name);
3697 for (addr = addrlist; addr; addr = addr->next)
3698 debug_printf(" %s\n", addr->address);
3699 if (hostlist)
3700 {
3701 debug_printf("hostlist:\n");
3702 for (host = hostlist; host; host = host->next)
3703 debug_printf(" %s:%d\n", host->name, host->port);
3704 }
3705 if (continue_hostname)
3706 debug_printf("already connected to %s [%s] (on fd %d)\n",
3707 continue_hostname, continue_host_address,
3708 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3709 }
3710
3711 /* Set the flag requesting that these hosts be added to the waiting
3712 database if the delivery fails temporarily or if we are running with
3713 queue_smtp or a 2-stage queue run. This gets unset for certain
3714 kinds of error, typically those that are specific to the message. */
3715
3716 update_waiting = TRUE;
3717
3718 /* If a host list is not defined for the addresses - they must all have the
3719 same one in order to be passed to a single transport - or if the transport has
3720 a host list with hosts_override set, use the host list supplied with the
3721 transport. It is an error for this not to exist. */
3722
3723 if (!hostlist || (ob->hosts_override && ob->hosts))
3724 {
3725 if (!ob->hosts)
3726 {
3727 addrlist->message = string_sprintf("%s transport called with no hosts set",
3728 tblock->name);
3729 addrlist->transport_return = PANIC;
3730 return FALSE; /* Only top address has status */
3731 }
3732
3733 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3734 ob->hosts);
3735
3736 /* If the transport's host list contains no '$' characters, and we are not
3737 randomizing, it is fixed and therefore a chain of hosts can be built once
3738 and for all, and remembered for subsequent use by other calls to this
3739 transport. If, on the other hand, the host list does contain '$', or we are
3740 randomizing its order, we have to rebuild it each time. In the fixed case,
3741 as the hosts string will never be used again, it doesn't matter that we
3742 replace all the : characters with zeros. */
3743
3744 if (!ob->hostlist)
3745 {
3746 uschar *s = ob->hosts;
3747
3748 if (Ustrchr(s, '$') != NULL)
3749 {
3750 if (!(expanded_hosts = expand_string(s)))
3751 {
3752 addrlist->message = string_sprintf("failed to expand list of hosts "
3753 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3754 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3755 return FALSE; /* Only top address has status */
3756 }
3757 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3758 "\"%s\"\n", s, expanded_hosts);
3759 s = expanded_hosts;
3760 }
3761 else
3762 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3763
3764 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3765
3766 /* Check that the expansion yielded something useful. */
3767 if (!hostlist)
3768 {
3769 addrlist->message =
3770 string_sprintf("%s transport has empty hosts setting", tblock->name);
3771 addrlist->transport_return = PANIC;
3772 return FALSE; /* Only top address has status */
3773 }
3774
3775 /* If there was no expansion of hosts, save the host list for
3776 next time. */
3777
3778 if (!expanded_hosts) ob->hostlist = hostlist;
3779 }
3780
3781 /* This is not the first time this transport has been run in this delivery;
3782 the host list was built previously. */
3783
3784 else
3785 hostlist = ob->hostlist;
3786 }
3787
3788 /* The host list was supplied with the address. If hosts_randomize is set, we
3789 must sort it into a random order if it did not come from MX records and has not
3790 already been randomized (but don't bother if continuing down an existing
3791 connection). */
3792
3793 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3794 {
3795 host_item *newlist = NULL;
3796 while (hostlist)
3797 {
3798 host_item *h = hostlist;
3799 hostlist = hostlist->next;
3800
3801 h->sort_key = random_number(100);
3802
3803 if (!newlist)
3804 {
3805 h->next = NULL;
3806 newlist = h;
3807 }
3808 else if (h->sort_key < newlist->sort_key)
3809 {
3810 h->next = newlist;
3811 newlist = h;
3812 }
3813 else
3814 {
3815 host_item *hh = newlist;
3816 while (hh->next)
3817 {
3818 if (h->sort_key < hh->next->sort_key) break;
3819 hh = hh->next;
3820 }
3821 h->next = hh->next;
3822 hh->next = h;
3823 }
3824 }
3825
3826 hostlist = addrlist->host_list = newlist;
3827 }
3828
3829 /* Sort out the default port. */
3830
3831 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3832
3833 /* For each host-plus-IP-address on the list:
3834
3835 . If this is a continued delivery and the host isn't the one with the
3836 current connection, skip.
3837
3838 . If the status is unusable (i.e. previously failed or retry checked), skip.
3839
3840 . If no IP address set, get the address, either by turning the name into
3841 an address, calling gethostbyname if gethostbyname is on, or by calling
3842 the DNS. The DNS may yield multiple addresses, in which case insert the
3843 extra ones into the list.
3844
3845 . Get the retry data if not previously obtained for this address and set the
3846 field which remembers the state of this address. Skip if the retry time is
3847 not reached. If not, remember whether retry data was found. The retry string
3848 contains both the name and the IP address.
3849
3850 . Scan the list of addresses and mark those whose status is DEFER as
3851 PENDING_DEFER. These are the only ones that will be processed in this cycle
3852 of the hosts loop.
3853
3854 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3855 Some addresses may be successfully delivered, others may fail, and yet
3856 others may get temporary errors and so get marked DEFER.
3857
3858 . The return from the delivery attempt is OK if a connection was made and a
3859 valid SMTP dialogue was completed. Otherwise it is DEFER.
3860
3861 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3862
3863 . If fail to connect, or other defer state, add a retry item.
3864
3865 . If there are any addresses whose status is still DEFER, carry on to the
3866 next host/IPaddress, unless we have tried the number of hosts given
3867 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3868 there is some fancy logic for hosts_max_try that means its limit can be
3869 overstepped in some circumstances.
3870
3871 If we get to the end of the list, all hosts have deferred at least one address,
3872 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3873 delivery attempt to those hosts whose last try was before the arrival time of
3874 the current message. To cope with this, we have to go round the loop a second
3875 time. After that, set the status and error data for any addresses that haven't
3876 had it set already. */
3877
3878 for (cutoff_retry = 0;
3879 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3880 cutoff_retry++)
3881 {
3882 host_item *nexthost = NULL;
3883 int unexpired_hosts_tried = 0;
3884
3885 for (host = hostlist;
3886 host
3887 && unexpired_hosts_tried < ob->hosts_max_try
3888 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3889 host = nexthost)
3890 {
3891 int rc;
3892 int host_af;
3893 uschar *rs;
3894 BOOL host_is_expired = FALSE;
3895 BOOL message_defer = FALSE;
3896 BOOL some_deferred = FALSE;
3897 address_item *first_addr = NULL;
3898 uschar *interface = NULL;
3899 uschar *retry_host_key = NULL;
3900 uschar *retry_message_key = NULL;
3901 uschar *serialize_key = NULL;
3902
3903 /* Default next host is next host. :-) But this can vary if the
3904 hosts_max_try limit is hit (see below). It may also be reset if a host
3905 address is looked up here (in case the host was multihomed). */
3906
3907 nexthost = host->next;
3908
3909 /* If the address hasn't yet been obtained from the host name, look it up
3910 now, unless the host is already marked as unusable. If it is marked as
3911 unusable, it means that the router was unable to find its IP address (in
3912 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3913 the lookup failed last time. We don't get this far if *all* MX records
3914 point to non-existent hosts; that is treated as a hard error.
3915
3916 We can just skip this host entirely. When the hosts came from the router,
3917 the address will timeout based on the other host(s); when the address is
3918 looked up below, there is an explicit retry record added.
3919
3920 Note that we mustn't skip unusable hosts if the address is not unset; they
3921 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3922
3923 if (!host->address)
3924 {
3925 int new_port, flags;
3926 host_item *hh;
3927
3928 if (host->status >= hstatus_unusable)
3929 {
3930 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3931 host->name);
3932 continue;
3933 }
3934
3935 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3936
3937 /* The host name is permitted to have an attached port. Find it, and
3938 strip it from the name. Just remember it for now. */
3939
3940 new_port = host_item_get_port(host);
3941
3942 /* Count hosts looked up */
3943
3944 hosts_looked_up++;
3945
3946 /* Find by name if so configured, or if it's an IP address. We don't
3947 just copy the IP address, because we need the test-for-local to happen. */
3948
3949 flags = HOST_FIND_BY_A;
3950 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3951 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3952
3953 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3954 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3955 else
3956 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3957 &ob->dnssec, /* domains for request/require */
3958 NULL, NULL);
3959
3960 /* Update the host (and any additional blocks, resulting from
3961 multihoming) with a host-specific port, if any. */
3962
3963 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3964
3965 /* Failure to find the host at this time (usually DNS temporary failure)
3966 is really a kind of routing failure rather than a transport failure.
3967 Therefore we add a retry item of the routing kind, not to stop us trying
3968 to look this name up here again, but to ensure the address gets timed
3969 out if the failures go on long enough. A complete failure at this point
3970 commonly points to a configuration error, but the best action is still
3971 to carry on for the next host. */
3972
3973 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3974 {
3975 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3976 expired = FALSE;
3977 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3978 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3979 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3980 host->status = hstatus_unusable;
3981
3982 for (addr = addrlist; addr; addr = addr->next)
3983 {
3984 if (addr->transport_return != DEFER) continue;
3985 addr->basic_errno = ERRNO_UNKNOWNHOST;
3986 addr->message = string_sprintf(
3987 rc == HOST_FIND_SECURITY
3988 ? "lookup of IP address for %s was insecure"
3989 : "failed to lookup IP address for %s",
3990 host->name);
3991 }
3992 continue;
3993 }
3994
3995 /* If the host is actually the local host, we may have a problem, or
3996 there may be some cunning configuration going on. In the problem case,
3997 log things and give up. The default transport status is already DEFER. */
3998
3999 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4000 {
4001 for (addr = addrlist; addr; addr = addr->next)
4002 {
4003 addr->basic_errno = 0;
4004 addr->message = string_sprintf("%s transport found host %s to be "
4005 "local", tblock->name, host->name);
4006 }
4007 goto END_TRANSPORT;
4008 }
4009 } /* End of block for IP address lookup */
4010
4011 /* If this is a continued delivery, we are interested only in the host
4012 which matches the name of the existing open channel. The check is put
4013 here after the local host lookup, in case the name gets expanded as a
4014 result of the lookup. Set expired FALSE, to save the outer loop executing
4015 twice. */
4016
4017 if ( continue_hostname
4018 && ( Ustrcmp(continue_hostname, host->name) != 0
4019 || Ustrcmp(continue_host_address, host->address) != 0
4020 ) )
4021 {
4022 expired = FALSE;
4023 continue; /* With next host */
4024 }
4025
4026 /* Reset the default next host in case a multihomed host whose addresses
4027 are not looked up till just above added to the host list. */
4028
4029 nexthost = host->next;
4030
4031 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4032 domain is in queue_smtp_domains, we don't actually want to attempt any
4033 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4034 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4035 were not in it. We don't want to hold up all SMTP deliveries! Except when
4036 doing a two-stage queue run, don't do this if forcing. */
4037
4038 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4039 match_isinlist(addrlist->domain,
4040 (const uschar **)&queue_smtp_domains, 0,
4041 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4042 {
4043 expired = FALSE;
4044 for (addr = addrlist; addr; addr = addr->next)
4045 if (addr->transport_return == DEFER)
4046 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4047 continue; /* With next host */
4048 }
4049
4050 /* Count hosts being considered - purely for an intelligent comment
4051 if none are usable. */
4052
4053 hosts_total++;
4054
4055 /* Set $host and $host address now in case they are needed for the
4056 interface expansion or the serialize_hosts check; they remain set if an
4057 actual delivery happens. */
4058
4059 deliver_host = host->name;
4060 deliver_host_address = host->address;
4061 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4062 : host->dnssec == DS_NO ? US"no"
4063 : US"";
4064
4065 /* Set up a string for adding to the retry key if the port number is not
4066 the standard SMTP port. A host may have its own port setting that overrides
4067 the default. */
4068
4069 pistring = string_sprintf(":%d", host->port == PORT_NONE
4070 ? defport : host->port);
4071 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4072
4073 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4074 string is set, even if constant (as different transports can have different
4075 constant settings), we must add it to the key that is used for retries,
4076 because connections to the same host from a different interface should be
4077 treated separately. */
4078
4079 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4080 if ((rs = ob->interface) && *rs)
4081 {
4082 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4083 return FALSE;
4084 pistring = string_sprintf("%s/%s", pistring, interface);
4085 }
4086
4087 /* The first time round the outer loop, check the status of the host by
4088 inspecting the retry data. The second time round, we are interested only
4089 in expired hosts that haven't been tried since this message arrived. */
4090
4091 if (cutoff_retry == 0)
4092 {
4093 BOOL incl_ip;
4094 /* Ensure the status of the address is set by checking retry data if
4095 necessary. There may be host-specific retry data (applicable to all
4096 messages) and also data for retries of a specific message at this host.
4097 If either of these retry records are actually read, the keys used are
4098 returned to save recomputing them later. */
4099
4100 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4101 US"retry_include_ip_address", ob->retry_include_ip_address,
4102 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4103 continue; /* with next host */
4104
4105 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4106 incl_ip, &retry_host_key, &retry_message_key);
4107
4108 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4109 (host->address == NULL)? US"" : host->address, pistring,
4110 (host->status == hstatus_usable)? "usable" :
4111 (host->status == hstatus_unusable)? "unusable" :
4112 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4113
4114 /* Skip this address if not usable at this time, noting if it wasn't
4115 actually expired, both locally and in the address. */
4116
4117 switch (host->status)
4118 {
4119 case hstatus_unusable:
4120 expired = FALSE;
4121 setflag(addrlist, af_retry_skipped);
4122 /* Fall through */
4123
4124 case hstatus_unusable_expired:
4125 switch (host->why)
4126 {
4127 case hwhy_retry: hosts_retry++; break;
4128 case hwhy_failed: hosts_fail++; break;
4129 case hwhy_insecure:
4130 case hwhy_deferred: hosts_defer++; break;
4131 }
4132
4133 /* If there was a retry message key, implying that previously there
4134 was a message-specific defer, we don't want to update the list of
4135 messages waiting for these hosts. */
4136
4137 if (retry_message_key) update_waiting = FALSE;
4138 continue; /* With the next host or IP address */
4139 }
4140 }
4141
4142 /* Second time round the loop: if the address is set but expired, and
4143 the message is newer than the last try, let it through. */
4144
4145 else
4146 {
4147 if ( !host->address
4148 || host->status != hstatus_unusable_expired
4149 || host->last_try > received_time)
4150 continue;
4151 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4152 host->name, host->address, pistring);
4153 host_is_expired = TRUE;
4154 }
4155
4156 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4157 it remains TRUE only if all hosts are expired and none are actually tried.
4158 */
4159
4160 expired = FALSE;
4161
4162 /* If this host is listed as one to which access must be serialized,
4163 see if another Exim process has a connection to it, and if so, skip
4164 this host. If not, update the database to record our connection to it
4165 and remember this for later deletion. Do not do any of this if we are
4166 sending the message down a pre-existing connection. */
4167
4168 if ( !continue_hostname
4169 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4170 {
4171 serialize_key = string_sprintf("host-serialize-%s", host->name);
4172 if (!enq_start(serialize_key, 1))
4173 {
4174 DEBUG(D_transport)
4175 debug_printf("skipping host %s because another Exim process "
4176 "is connected to it\n", host->name);
4177 hosts_serial++;
4178 continue;
4179 }
4180 }
4181
4182 /* OK, we have an IP address that is not waiting for its retry time to
4183 arrive (it might be expired) OR (second time round the loop) we have an
4184 expired host that hasn't been tried since the message arrived. Have a go
4185 at delivering the message to it. First prepare the addresses by flushing
4186 out the result of previous attempts, and finding the first address that
4187 is still to be delivered. */
4188
4189 first_addr = prepare_addresses(addrlist, host);
4190
4191 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4192 message_id, host->name, host->address, addrlist->address,
4193 addrlist->next ? ", ..." : "");
4194
4195 set_process_info("delivering %s to %s [%s] (%s%s)",
4196 message_id, host->name, host->address, addrlist->address,
4197 addrlist->next ? ", ..." : "");
4198
4199 /* This is not for real; don't do the delivery. If there are
4200 any remaining hosts, list them. */
4201
4202 if (dont_deliver)
4203 {
4204 host_item *host2;
4205 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4206 for (addr = addrlist; addr; addr = addr->next)
4207 {
4208 addr->host_used = host;
4209 addr->special_action = '*';
4210 addr->message = US"delivery bypassed by -N option";
4211 }
4212 DEBUG(D_transport)
4213 {
4214 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4215 "*** host and remaining hosts:\n", tblock->name);
4216 for (host2 = host; host2; host2 = host2->next)
4217 debug_printf(" %s [%s]\n", host2->name,
4218 host2->address ? host2->address : US"unset");
4219 }
4220 rc = OK;
4221 }
4222
4223 /* This is for real. If the host is expired, we don't count it for
4224 hosts_max_retry. This ensures that all hosts must expire before an address
4225 is timed out, unless hosts_max_try_hardlimit (which protects against
4226 lunatic DNS configurations) is reached.
4227
4228 If the host is not expired and we are about to hit the hosts_max_retry
4229 limit, check to see if there is a subsequent hosts with a different MX
4230 value. If so, make that the next host, and don't count this one. This is a
4231 heuristic to make sure that different MXs do get tried. With a normal kind
4232 of retry rule, they would get tried anyway when the earlier hosts were
4233 delayed, but if the domain has a "retry every time" type of rule - as is
4234 often used for the the very large ISPs, that won't happen. */
4235
4236 else
4237 {
4238 host_item * thost;
4239 /* Make a copy of the host if it is local to this invocation
4240 of the transport. */
4241
4242 if (expanded_hosts)
4243 {
4244 thost = store_get(sizeof(host_item));
4245 *thost = *host;
4246 thost->name = string_copy(host->name);
4247 thost->address = string_copy(host->address);
4248 }
4249 else
4250 thost = host;
4251
4252 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4253 {
4254 host_item *h;
4255 DEBUG(D_transport)
4256 debug_printf("hosts_max_try limit reached with this host\n");
4257 for (h = host; h; h = h->next) if (h->mx != host->mx)
4258 {
4259 nexthost = h;
4260 unexpired_hosts_tried--;
4261 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4262 "and will be tried\n");
4263 break;
4264 }
4265 }
4266
4267 /* Attempt the delivery. */
4268
4269 total_hosts_tried++;
4270 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4271 &message_defer, FALSE);
4272
4273 /* Yield is one of:
4274 OK => connection made, each address contains its result;
4275 message_defer is set for message-specific defers (when all
4276 recipients are marked defer)
4277 DEFER => there was a non-message-specific delivery problem;
4278 ERROR => there was a problem setting up the arguments for a filter,
4279 or there was a problem with expanding added headers
4280 */
4281
4282 /* If the result is not OK, there was a non-message-specific problem.
4283 If the result is DEFER, we need to write to the logs saying what happened
4284 for this particular host, except in the case of authentication and TLS
4285 failures, where the log has already been written. If all hosts defer a
4286 general message is written at the end. */
4287
4288 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4289 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4290 write_logs(first_addr, host);
4291
4292 #ifndef DISABLE_EVENT
4293 if (rc == DEFER)
4294 deferred_event_raise(first_addr, host);
4295 #endif
4296
4297 /* If STARTTLS was accepted, but there was a failure in setting up the
4298 TLS session (usually a certificate screwup), and the host is not in
4299 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4300 TLS forcibly turned off. We have to start from scratch with a new SMTP
4301 connection. That's why the retry is done from here, not from within
4302 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4303 session, so the in-clear transmission after those errors, if permitted,
4304 happens inside smtp_deliver().] */
4305
4306 #ifdef SUPPORT_TLS
4307 if ( rc == DEFER
4308 && first_addr->basic_errno == ERRNO_TLSFAILURE
4309 && ob->tls_tempfail_tryclear
4310 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4311 )
4312 {
4313 log_write(0, LOG_MAIN,
4314 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4315 first_addr->message, host->name, host->address);
4316 first_addr = prepare_addresses(addrlist, host);
4317 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4318 &message_defer, TRUE);
4319 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4320 write_logs(first_addr, host);
4321 # ifndef DISABLE_EVENT
4322 if (rc == DEFER)
4323 deferred_event_raise(first_addr, host);
4324 # endif
4325 }
4326 #endif /*SUPPORT_TLS*/
4327 }
4328
4329 /* Delivery attempt finished */
4330
4331 rs = rc == OK ? US"OK"
4332 : rc == DEFER ? US"DEFER"
4333 : rc == ERROR ? US"ERROR"
4334 : US"?";
4335
4336 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4337 message_id, host->name, host->address, addrlist->address,
4338 addrlist->next ? " (& others)" : "", rs);
4339
4340 /* Release serialization if set up */
4341
4342 if (serialize_key) enq_end(serialize_key);
4343
4344 /* If the result is DEFER, or if a host retry record is known to exist, we
4345 need to add an item to the retry chain for updating the retry database
4346 at the end of delivery. We only need to add the item to the top address,
4347 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4348 for any other delivery attempts using the same address. (It is copied into
4349 the unusable tree at the outer level, so even if different address blocks
4350 contain the same address, it still won't get tried again.) */
4351
4352 if (rc == DEFER || retry_host_key)
4353 {
4354 int delete_flag = rc != DEFER ? rf_delete : 0;
4355 if (!retry_host_key)
4356 {
4357 BOOL incl_ip;
4358 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4359 US"retry_include_ip_address", ob->retry_include_ip_address,
4360 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4361 incl_ip = TRUE; /* error; use most-specific retry record */
4362
4363 retry_host_key = incl_ip
4364 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4365 : string_sprintf("T:%S%s", host->name, pistring);
4366 }
4367
4368 /* If a delivery of another message over an existing SMTP connection
4369 yields DEFER, we do NOT set up retry data for the host. This covers the
4370 case when there are delays in routing the addresses in the second message
4371 that are so long that the server times out. This is alleviated by not
4372 routing addresses that previously had routing defers when handling an
4373 existing connection, but even so, this case may occur (e.g. if a
4374 previously happily routed address starts giving routing defers). If the
4375 host is genuinely down, another non-continued message delivery will
4376 notice it soon enough. */
4377
4378 if (delete_flag != 0 || !continue_hostname)
4379 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4380
4381 /* We may have tried an expired host, if its retry time has come; ensure
4382 the status reflects the expiry for the benefit of any other addresses. */
4383
4384 if (rc == DEFER)
4385 {
4386 host->status = host_is_expired
4387 ? hstatus_unusable_expired : hstatus_unusable;
4388 host->why = hwhy_deferred;
4389 }
4390 }
4391
4392 /* If message_defer is set (host was OK, but every recipient got deferred
4393 because of some message-specific problem), or if that had happened
4394 previously so that a message retry key exists, add an appropriate item
4395 to the retry chain. Note that if there was a message defer but now there is
4396 a host defer, the message defer record gets deleted. That seems perfectly
4397 reasonable. Also, stop the message from being remembered as waiting
4398 for specific hosts. */
4399
4400 if (message_defer || retry_message_key)
4401 {
4402 int delete_flag = message_defer ? 0 : rf_delete;
4403 if (!retry_message_key)
4404 {
4405 BOOL incl_ip;
4406 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4407 US"retry_include_ip_address", ob->retry_include_ip_address,
4408 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4409 incl_ip = TRUE; /* error; use most-specific retry record */
4410
4411 retry_message_key = incl_ip
4412 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4413 message_id)
4414 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4415 }
4416 retry_add_item(addrlist, retry_message_key,
4417 rf_message | rf_host | delete_flag);
4418 update_waiting = FALSE;
4419 }
4420
4421 /* Any return other than DEFER (that is, OK or ERROR) means that the
4422 addresses have got their final statuses filled in for this host. In the OK
4423 case, see if any of them are deferred. */
4424
4425 if (rc == OK)
4426 for (addr = addrlist; addr; addr = addr->next)
4427 if (addr->transport_return == DEFER)
4428 {
4429 some_deferred = TRUE;
4430 break;
4431 }
4432
4433 /* If no addresses deferred or the result was ERROR, return. We do this for
4434 ERROR because a failing filter set-up or add_headers expansion is likely to
4435 fail for any host we try. */
4436
4437 if (rc == ERROR || (rc == OK && !some_deferred))
4438 {
4439 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4440 return TRUE; /* Each address has its status */
4441 }
4442
4443 /* If the result was DEFER or some individual addresses deferred, let
4444 the loop run to try other hosts with the deferred addresses, except for the
4445 case when we were trying to deliver down an existing channel and failed.
4446 Don't try any other hosts in this case. */
4447
4448 if (continue_hostname) break;
4449
4450 /* If the whole delivery, or some individual addresses, were deferred and
4451 there are more hosts that could be tried, do not count this host towards
4452 the hosts_max_try limit if the age of the message is greater than the
4453 maximum retry time for this host. This means we may try try all hosts,
4454 ignoring the limit, when messages have been around for some time. This is
4455 important because if we don't try all hosts, the address will never time
4456 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4457
4458 if ((rc == DEFER || some_deferred) && nexthost)
4459 {
4460 BOOL timedout;
4461 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4462
4463 if (retry && retry->rules)
4464 {
4465 retry_rule *last_rule;
4466 for (last_rule = retry->rules;
4467 last_rule->next;
4468 last_rule = last_rule->next);
4469 timedout = time(NULL) - received_time > last_rule->timeout;
4470 }
4471 else timedout = TRUE; /* No rule => timed out */
4472
4473 if (timedout)
4474 {
4475 unexpired_hosts_tried--;
4476 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4477 "hosts_max_try (message older than host's retry time)\n");
4478 }
4479 }
4480 } /* End of loop for trying multiple hosts. */
4481
4482 /* This is the end of the loop that repeats iff expired is TRUE and
4483 ob->delay_after_cutoff is FALSE. The second time round we will
4484 try those hosts that haven't been tried since the message arrived. */
4485
4486 DEBUG(D_transport)
4487 {
4488 debug_printf("all IP addresses skipped or deferred at least one address\n");
4489 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4490 debug_printf("retrying IP addresses not tried since message arrived\n");
4491 }
4492 }
4493
4494
4495 /* Get here if all IP addresses are skipped or defer at least one address. In
4496 MUA wrapper mode, this will happen only for connection or other non-message-
4497 specific failures. Force the delivery status for all addresses to FAIL. */
4498
4499 if (mua_wrapper)
4500 {
4501 for (addr = addrlist; addr; addr = addr->next)
4502 addr->transport_return = FAIL;
4503 goto END_TRANSPORT;
4504 }
4505
4506 /* In the normal, non-wrapper case, add a standard message to each deferred
4507 address if there hasn't been an error, that is, if it hasn't actually been
4508 tried this time. The variable "expired" will be FALSE if any deliveries were
4509 actually tried, or if there was at least one host that was not expired. That
4510 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4511 a delivery has been tried, an error code will be set, and the failing of the
4512 message is handled by the retry code later.
4513
4514 If queue_smtp is set, or this transport was called to send a subsequent message
4515 down an existing TCP/IP connection, and something caused the host not to be
4516 found, we end up here, but can detect these cases and handle them specially. */
4517
4518 for (addr = addrlist; addr; addr = addr->next)
4519 {
4520 /* If host is not NULL, it means that we stopped processing the host list
4521 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4522 means we need to behave as if some hosts were skipped because their retry
4523 time had not come. Specifically, this prevents the address from timing out.
4524 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4525 hosts were tried. */
4526
4527 if (host)
4528 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4529 {
4530 DEBUG(D_transport)
4531 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4532 "hosts were tried\n");
4533 }
4534 else
4535 {
4536 DEBUG(D_transport)
4537 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4538 setflag(addr, af_retry_skipped);
4539 }
4540
4541 if (queue_smtp) /* no deliveries attempted */
4542 {
4543 addr->transport_return = DEFER;
4544 addr->basic_errno = 0;
4545 addr->message = US"SMTP delivery explicitly queued";
4546 }
4547
4548 else if ( addr->transport_return == DEFER
4549 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4550 && !addr->message
4551 )
4552 {
4553 addr->basic_errno = ERRNO_HRETRY;
4554 if (continue_hostname)
4555 addr->message = US"no host found for existing SMTP connection";
4556 else if (expired)
4557 {
4558 setflag(addr, af_pass_message); /* This is not a security risk */
4559 addr->message = string_sprintf(
4560 "all hosts%s have been failing for a long time %s",
4561 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4562 ob->delay_after_cutoff
4563 ? US"(and retry time not reached)"
4564 : US"and were last tried after this message arrived");
4565
4566 /* If we are already using fallback hosts, or there are no fallback hosts
4567 defined, convert the result to FAIL to cause a bounce. */
4568
4569 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4570 addr->transport_return = FAIL;
4571 }
4572 else
4573 {
4574 const char * s;
4575 if (hosts_retry == hosts_total)
4576 s = "retry time not reached for any host%s";
4577 else if (hosts_fail == hosts_total)
4578 s = "all host address lookups%s failed permanently";
4579 else if (hosts_defer == hosts_total)
4580 s = "all host address lookups%s failed temporarily";
4581 else if (hosts_serial == hosts_total)
4582 s = "connection limit reached for all hosts%s";
4583 else if (hosts_fail+hosts_defer == hosts_total)
4584 s = "all host address lookups%s failed";
4585 else
4586 s = "some host address lookups failed and retry time "
4587 "not reached for other hosts or connection limit reached%s";
4588
4589 addr->message = string_sprintf(s,
4590 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4591 }
4592 }
4593 }
4594
4595 /* Update the database which keeps information about which messages are waiting
4596 for which hosts to become available. For some message-specific errors, the
4597 update_waiting flag is turned off because we don't want follow-on deliveries in
4598 those cases. If this transport instance is explicitly limited to one message
4599 per connection then follow-on deliveries are not possible and there's no need
4600 to create/update the per-transport wait-<transport_name> database. */
4601
4602 if (update_waiting && tblock->connection_max_messages != 1)
4603 transport_update_waiting(hostlist, tblock->name);
4604
4605 END_TRANSPORT:
4606
4607 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4608
4609 return TRUE; /* Each address has its status */
4610 }
4611
4612 /* vi: aw ai sw=2
4613 */
4614 /* End of transport/smtp.c */
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