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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_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
190 #ifdef MACRO_PREDEF
191
192 /* Dummy values */
193 smtp_transport_options_block smtp_transport_option_defaults = {0};
194 void smtp_transport_init(transport_instance *tblock) {}
195 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
196 void smtp_transport_closedown(transport_instance *tblock) {}
197
198 #else /*!MACRO_PREDEF*/
199
200
201 /* Default private options block for the smtp transport. */
202
203 smtp_transport_options_block smtp_transport_option_defaults = {
204 NULL, /* hosts */
205 NULL, /* fallback_hosts */
206 NULL, /* hostlist */
207 NULL, /* fallback_hostlist */
208 NULL, /* authenticated_sender */
209 US"$primary_hostname", /* helo_data */
210 NULL, /* interface */
211 NULL, /* port */
212 US"smtp", /* protocol */
213 NULL, /* DSCP */
214 NULL, /* serialize_hosts */
215 NULL, /* hosts_try_auth */
216 NULL, /* hosts_require_auth */
217 US"*", /* hosts_try_chunking */
218 #ifdef EXPERIMENTAL_DANE
219 NULL, /* hosts_try_dane */
220 NULL, /* hosts_require_dane */
221 #endif
222 NULL, /* hosts_try_fastopen */
223 #ifndef DISABLE_PRDR
224 US"*", /* hosts_try_prdr */
225 #endif
226 #ifndef DISABLE_OCSP
227 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
228 NULL, /* hosts_require_ocsp */
229 #endif
230 NULL, /* hosts_require_tls */
231 NULL, /* hosts_avoid_tls */
232 NULL, /* hosts_verify_avoid_tls */
233 NULL, /* hosts_avoid_pipelining */
234 NULL, /* hosts_avoid_esmtp */
235 #ifdef SUPPORT_TLS
236 NULL, /* hosts_nopass_tls */
237 US"*", /* hosts_noproxy_tls */
238 #endif
239 5*60, /* command_timeout */
240 5*60, /* connect_timeout; shorter system default overrides */
241 5*60, /* data timeout */
242 10*60, /* final timeout */
243 1024, /* size_addition */
244 5, /* hosts_max_try */
245 50, /* hosts_max_try_hardlimit */
246 TRUE, /* address_retry_include_sender */
247 FALSE, /* allow_localhost */
248 FALSE, /* authenticated_sender_force */
249 FALSE, /* gethostbyname */
250 TRUE, /* dns_qualify_single */
251 FALSE, /* dns_search_parents */
252 { NULL, NULL }, /* dnssec_domains {request,require} */
253 TRUE, /* delay_after_cutoff */
254 FALSE, /* hosts_override */
255 FALSE, /* hosts_randomize */
256 TRUE, /* keepalive */
257 FALSE, /* lmtp_ignore_quota */
258 NULL, /* expand_retry_include_ip_address */
259 TRUE /* retry_include_ip_address */
260 #ifdef SUPPORT_SOCKS
261 ,NULL /* socks_proxy */
262 #endif
263 #ifdef SUPPORT_TLS
264 ,NULL, /* tls_certificate */
265 NULL, /* tls_crl */
266 NULL, /* tls_privatekey */
267 NULL, /* tls_require_ciphers */
268 NULL, /* tls_sni */
269 US"system", /* tls_verify_certificates */
270 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
271 /* tls_dh_min_bits */
272 TRUE, /* tls_tempfail_tryclear */
273 NULL, /* tls_verify_hosts */
274 US"*", /* tls_try_verify_hosts */
275 US"*" /* tls_verify_cert_hostnames */
276 #endif
277 #ifndef DISABLE_DKIM
278 , {NULL, /* dkim_canon */
279 NULL, /* dkim_domain */
280 NULL, /* dkim_private_key */
281 NULL, /* dkim_selector */
282 NULL, /* dkim_sign_headers */
283 NULL, /* dkim_strict */
284 FALSE} /* dot_stuffed */
285 #endif
286 };
287
288 /* some DSN flags for use later */
289
290 static int rf_list[] = {rf_notify_never, rf_notify_success,
291 rf_notify_failure, rf_notify_delay };
292
293 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
294
295
296
297 /* Local statics */
298
299 static uschar *smtp_command; /* Points to last cmd for error messages */
300 static uschar *mail_command; /* Points to MAIL cmd for error messages */
301 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
302 static BOOL update_waiting; /* TRUE to update the "wait" database */
303
304 /*XXX move to smtp_context */
305 static BOOL pipelining_active; /* current transaction is in pipe mode */
306
307
308 /*************************************************
309 * Setup entry point *
310 *************************************************/
311
312 /* This function is called when the transport is about to be used,
313 but before running it in a sub-process. It is used for two things:
314
315 (1) To set the fallback host list in addresses, when delivering.
316 (2) To pass back the interface, port, protocol, and other options, for use
317 during callout verification.
318
319 Arguments:
320 tblock pointer to the transport instance block
321 addrlist list of addresses about to be transported
322 tf if not NULL, pointer to block in which to return options
323 uid the uid that will be set (not used)
324 gid the gid that will be set (not used)
325 errmsg place for error message (not used)
326
327 Returns: OK always (FAIL, DEFER not used)
328 */
329
330 static int
331 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
332 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
333 {
334 smtp_transport_options_block *ob =
335 (smtp_transport_options_block *)(tblock->options_block);
336
337 errmsg = errmsg; /* Keep picky compilers happy */
338 uid = uid;
339 gid = gid;
340
341 /* Pass back options if required. This interface is getting very messy. */
342
343 if (tf)
344 {
345 tf->interface = ob->interface;
346 tf->port = ob->port;
347 tf->protocol = ob->protocol;
348 tf->hosts = ob->hosts;
349 tf->hosts_override = ob->hosts_override;
350 tf->hosts_randomize = ob->hosts_randomize;
351 tf->gethostbyname = ob->gethostbyname;
352 tf->qualify_single = ob->dns_qualify_single;
353 tf->search_parents = ob->dns_search_parents;
354 tf->helo_data = ob->helo_data;
355 }
356
357 /* Set the fallback host list for all the addresses that don't have fallback
358 host lists, provided that the local host wasn't present in the original host
359 list. */
360
361 if (!testflag(addrlist, af_local_host_removed))
362 for (; addrlist; addrlist = addrlist->next)
363 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
364
365 return OK;
366 }
367
368
369
370 /*************************************************
371 * Initialization entry point *
372 *************************************************/
373
374 /* Called for each instance, after its options have been read, to
375 enable consistency checks to be done, or anything else that needs
376 to be set up.
377
378 Argument: pointer to the transport instance block
379 Returns: nothing
380 */
381
382 void
383 smtp_transport_init(transport_instance *tblock)
384 {
385 smtp_transport_options_block *ob =
386 (smtp_transport_options_block *)(tblock->options_block);
387
388 /* Retry_use_local_part defaults FALSE if unset */
389
390 if (tblock->retry_use_local_part == TRUE_UNSET)
391 tblock->retry_use_local_part = FALSE;
392
393 /* Set the default port according to the protocol */
394
395 if (ob->port == NULL)
396 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
397 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
398
399 /* Set up the setup entry point, to be called before subprocesses for this
400 transport. */
401
402 tblock->setup = smtp_transport_setup;
403
404 /* Complain if any of the timeouts are zero. */
405
406 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
407 ob->final_timeout <= 0)
408 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
409 "command, data, or final timeout value is zero for %s transport",
410 tblock->name);
411
412 /* If hosts_override is set and there are local hosts, set the global
413 flag that stops verify from showing router hosts. */
414
415 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
416
417 /* If there are any fallback hosts listed, build a chain of host items
418 for them, but do not do any lookups at this time. */
419
420 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
421 }
422
423
424
425
426
427 /*************************************************
428 * Set delivery info into all active addresses *
429 *************************************************/
430
431 /* Only addresses whose status is >= PENDING are relevant. A lesser
432 status means that an address is not currently being processed.
433
434 Arguments:
435 addrlist points to a chain of addresses
436 errno_value to put in each address's errno field
437 msg to put in each address's message field
438 rc to put in each address's transport_return field
439 pass_message if TRUE, set the "pass message" flag in the address
440 host if set, mark addrs as having used this host
441 smtp_greeting from peer
442 helo_response from peer
443
444 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446 this particular type of timeout.
447
448 Returns: nothing
449 */
450
451 static void
452 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
453 BOOL pass_message, host_item * host
454 #ifdef EXPERIMENTAL_DSN_INFO
455 , const uschar * smtp_greeting, const uschar * helo_response
456 #endif
457 )
458 {
459 address_item *addr;
460 int orvalue = 0;
461 if (errno_value == ERRNO_CONNECTTIMEOUT)
462 {
463 errno_value = ETIMEDOUT;
464 orvalue = RTEF_CTOUT;
465 }
466 for (addr = addrlist; addr; addr = addr->next)
467 if (addr->transport_return >= PENDING)
468 {
469 addr->basic_errno = errno_value;
470 addr->more_errno |= orvalue;
471 if (msg)
472 {
473 addr->message = msg;
474 if (pass_message) setflag(addr, af_pass_message);
475 }
476 addr->transport_return = rc;
477 if (host)
478 {
479 addr->host_used = host;
480 #ifdef EXPERIMENTAL_DSN_INFO
481 if (smtp_greeting)
482 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
483 addr->smtp_greeting = smtp_greeting;
484
485 if (helo_response)
486 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
487 addr->helo_response = helo_response;
488 #endif
489 }
490 }
491 }
492
493 static void
494 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
495 BOOL pass_message)
496 {
497 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
498 #ifdef EXPERIMENTAL_DSN_INFO
499 , NULL, NULL
500 #endif
501 );
502 }
503
504
505 /*************************************************
506 * Check an SMTP response *
507 *************************************************/
508
509 /* This function is given an errno code and the SMTP response buffer
510 to analyse, together with the host identification for generating messages. It
511 sets an appropriate message and puts the first digit of the response code into
512 the yield variable. If no response was actually read, a suitable digit is
513 chosen.
514
515 Arguments:
516 host the current host, to get its name for messages
517 errno_value pointer to the errno value
518 more_errno from the top address for use with ERRNO_FILTER_FAIL
519 buffer the SMTP response buffer
520 yield where to put a one-digit SMTP response code
521 message where to put an error message
522 pass_message set TRUE if message is an SMTP response
523
524 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
525 */
526
527 static BOOL
528 check_response(host_item *host, int *errno_value, int more_errno,
529 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
530 {
531 uschar * pl = pipelining_active ? US"pipelined " : US"";
532 const uschar * s;
533
534 *yield = '4'; /* Default setting is to give a temporary error */
535
536 switch(*errno_value)
537 {
538 case ETIMEDOUT: /* Handle response timeout */
539 *message = US string_sprintf("SMTP timeout after %s%s",
540 pl, smtp_command);
541 if (transport_count > 0)
542 *message = US string_sprintf("%s (%d bytes written)", *message,
543 transport_count);
544 return FALSE;
545
546 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
547 s = string_printing(buffer);
548 while (isspace(*s)) s++;
549 *message = *s == 0
550 ? string_sprintf("Malformed SMTP reply (an empty line) "
551 "in response to %s%s", pl, smtp_command)
552 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
553 pl, smtp_command, s);
554 return FALSE;
555
556 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
557 can't send QUIT as we mustn't end the DATA. */
558 *message = string_sprintf("transport filter process failed (%d)%s",
559 more_errno,
560 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
561 return FALSE;
562
563 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
564 can't send QUIT as we mustn't end the DATA. */
565 *message =
566 string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
568 return FALSE;
569
570 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
571 *message = string_sprintf("failed to write a data block");
572 return FALSE;
573
574 #ifdef SUPPORT_I18N
575 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
579 #endif
580 }
581
582 /* Handle error responses from the remote mailer. */
583
584 if (buffer[0] != 0)
585 {
586 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
587 "%s", pl, smtp_command, s = string_printing(buffer));
588 *pass_message = TRUE;
589 *yield = buffer[0];
590 return TRUE;
591 }
592
593 /* No data was read. If there is no errno, this must be the EOF (i.e.
594 connection closed) case, which causes deferral. An explicit connection reset
595 error has the same effect. Otherwise, put the host's identity in the message,
596 leaving the errno value to be interpreted as well. In all cases, we have to
597 assume the connection is now dead. */
598
599 if (*errno_value == 0 || *errno_value == ECONNRESET)
600 {
601 *errno_value = ERRNO_SMTPCLOSED;
602 *message = US string_sprintf("Remote host closed connection "
603 "in response to %s%s", pl, smtp_command);
604 }
605 else
606 *message = US string_sprintf("%s [%s]", host->name, host->address);
607
608 return FALSE;
609 }
610
611
612
613 /*************************************************
614 * Write error message to logs *
615 *************************************************/
616
617 /* This writes to the main log and to the message log.
618
619 Arguments:
620 addr the address item containing error information
621 host the current host
622
623 Returns: nothing
624 */
625
626 static void
627 write_logs(address_item *addr, host_item *host)
628 {
629 uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
633
634 if (addr->message)
635 {
636 message = string_sprintf("%s: %s", message, addr->message);
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
641 }
642 else
643 {
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
647 }
648 }
649
650 static void
651 msglog_line(host_item * host, uschar * message)
652 {
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
655 }
656
657
658
659 #ifndef DISABLE_EVENT
660 /*************************************************
661 * Post-defer action *
662 *************************************************/
663
664 /* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667 Arguments:
668 addr the address item containing error information
669 host the current host
670
671 Returns: nothing
672 */
673
674 static void
675 deferred_event_raise(address_item *addr, host_item *host)
676 {
677 uschar * action = addr->transport->event_action;
678 const uschar * save_domain;
679 uschar * save_local;
680
681 if (!action)
682 return;
683
684 save_domain = deliver_domain;
685 save_local = deliver_localpart;
686
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
691
692 router_name = addr->router->name;
693 transport_name = addr->transport->name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
696
697 (void) event_raise(action, US"msg:host:defer",
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706 deliver_localpart = save_local;
707 deliver_domain = save_domain;
708 router_name = transport_name = NULL;
709 }
710 #endif
711
712 /*************************************************
713 * Synchronize SMTP responses *
714 *************************************************/
715
716 /* This function is called from smtp_deliver() to receive SMTP responses from
717 the server, and match them up with the commands to which they relate. When
718 PIPELINING is not in use, this function is called after every command, and is
719 therefore somewhat over-engineered, but it is simpler to use a single scheme
720 that works both with and without PIPELINING instead of having two separate sets
721 of code.
722
723 The set of commands that are buffered up with pipelining may start with MAIL
724 and may end with DATA; in between are RCPT commands that correspond to the
725 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726 etc.) are never buffered.
727
728 Errors after MAIL or DATA abort the whole process leaving the response in the
729 buffer. After MAIL, pending responses are flushed, and the original command is
730 re-instated in big_buffer for error messages. For RCPT commands, the remote is
731 permitted to reject some recipient addresses while accepting others. However
732 certain errors clearly abort the whole process. Set the value in
733 transport_return to PENDING_OK if the address is accepted. If there is a
734 subsequent general error, it will get reset accordingly. If not, it will get
735 converted to OK at the end.
736
737 Arguments:
738 sx smtp connection context
739 count the number of responses to read
740 pending_DATA 0 if last command sent was not DATA
741 +1 if previously had a good recipient
742 -1 if not previously had a good recipient
743
744 Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
751 */
752
753 static int
754 sync_responses(smtp_context * sx, int count, int pending_DATA)
755 {
756 address_item *addr = sx->sync_addr;
757 smtp_transport_options_block *ob =
758 (smtp_transport_options_block *)sx->tblock->options_block;
759 int yield = 0;
760
761 /* Handle the response for a MAIL command. On error, reinstate the original
762 command in big_buffer for error message use, and flush any further pending
763 responses before returning, except after I/O errors and timeouts. */
764
765 if (sx->pending_MAIL)
766 {
767 count--;
768 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
769 '2', ob->command_timeout))
770 {
771 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
772 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
773 if (errno == 0 && sx->buffer[0] != 0)
774 {
775 uschar flushbuffer[4096];
776 int save_errno = 0;
777 if (sx->buffer[0] == '4')
778 {
779 save_errno = ERRNO_MAIL4XX;
780 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
781 }
782 while (count-- > 0)
783 {
784 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
785 '2', ob->command_timeout)
786 && (errno != 0 || flushbuffer[0] == 0))
787 break;
788 }
789 errno = save_errno;
790 }
791
792 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 while (count-- > 0) /* Mark any pending addrs with the host used */
794 {
795 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
796 addr->host_used = sx->host;
797 addr = addr->next;
798 }
799 return -3;
800 }
801 }
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804
805 /* Read and handle the required number of RCPT responses, matching each one up
806 with an address by scanning for the next address whose status is PENDING_DEFER.
807 */
808
809 while (count-- > 0)
810 {
811 while (addr->transport_return != PENDING_DEFER)
812 if (!(addr = addr->next))
813 return -2;
814
815 /* The address was accepted */
816 addr->host_used = sx->host;
817
818 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
819 '2', ob->command_timeout))
820 {
821 yield |= 1;
822 addr->transport_return = PENDING_OK;
823
824 /* If af_dr_retry_exists is set, there was a routing delay on this address;
825 ensure that any address-specific retry record is expunged. We do this both
826 for the basic key and for the version that also includes the sender. */
827
828 if (testflag(addr, af_dr_retry_exists))
829 {
830 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
831 sender_address);
832 retry_add_item(addr, altkey, rf_delete);
833 retry_add_item(addr, addr->address_retry_key, rf_delete);
834 }
835 }
836
837 /* Timeout while reading the response */
838
839 else if (errno == ETIMEDOUT)
840 {
841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
842 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
843 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
844 retry_add_item(addr, addr->address_retry_key, 0);
845 update_waiting = FALSE;
846 return -1;
847 }
848
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
852 makes sense. */
853
854 else if (errno != 0 || sx->buffer[0] == 0)
855 {
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
858 return -2;
859 }
860
861 /* Handle SMTP permanent and temporary response codes. */
862
863 else
864 {
865 addr->message =
866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
867 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
868 string_printing(sx->buffer));
869 setflag(addr, af_pass_message);
870 if (!sx->verify)
871 msglog_line(sx->host, addr->message);
872
873 /* The response was 5xx */
874
875 if (sx->buffer[0] == '5')
876 {
877 addr->transport_return = FAIL;
878 yield |= 2;
879 }
880
881 /* The response was 4xx */
882
883 else
884 {
885 addr->transport_return = DEFER;
886 addr->basic_errno = ERRNO_RCPT4XX;
887 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
888
889 if (!sx->verify)
890 {
891 #ifndef DISABLE_EVENT
892 event_defer_errno = addr->more_errno;
893 msg_event_raise(US"msg:rcpt:host:defer", addr);
894 #endif
895
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
898
899 if (sx->host->next)
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
901 sx->host->name, sx->host->address, addr->message);
902
903 #ifndef DISABLE_EVENT
904 else
905 msg_event_raise(US"msg:rcpt:defer", addr);
906 #endif
907
908 /* Do not put this message on the list of those waiting for specific
909 hosts, as otherwise it is likely to be tried too often. */
910
911 update_waiting = FALSE;
912
913 /* Add a retry item for the address so that it doesn't get tried again
914 too soon. If address_retry_include_sender is true, add the sender address
915 to the retry key. */
916
917 retry_add_item(addr,
918 ob->address_retry_include_sender
919 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
920 : addr->address_retry_key,
921 0);
922 }
923 }
924 }
925 } /* Loop for next RCPT response */
926
927 /* Update where to start at for the next block of responses, unless we
928 have already handled all the addresses. */
929
930 if (addr) sx->sync_addr = addr->next;
931
932 /* Handle a response to DATA. If we have not had any good recipients, either
933 previously or in this block, the response is ignored. */
934
935 if (pending_DATA != 0 &&
936 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
937 '3', ob->command_timeout))
938 {
939 int code;
940 uschar *msg;
941 BOOL pass_message;
942 if (pending_DATA > 0 || (yield & 1) != 0)
943 {
944 if (errno == 0 && sx->buffer[0] == '4')
945 {
946 errno = ERRNO_DATA4XX;
947 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
948 }
949 return -3;
950 }
951 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
952 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
953 "is in use and there were no good recipients\n", msg);
954 }
955
956 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
957 present) received 3xx. If any RCPTs were handled and yielded anything other
958 than 4xx, yield will be set non-zero. */
959
960 return yield;
961 }
962
963
964
965 /* Do the client side of smtp-level authentication */
966 /*
967 Arguments:
968 buffer EHLO response from server (gets overwritten)
969 addrlist chain of potential addresses to deliver
970 host host to deliver to
971 ob transport options
972 ibp, obp comms channel control blocks
973
974 Returns:
975 OK Success, or failed (but not required): global "smtp_authenticated" set
976 DEFER Failed authentication (and was required)
977 ERROR Internal problem
978
979 FAIL_SEND Failed communications - transmit
980 FAIL - response
981 */
982
983 int
984 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
985 smtp_transport_options_block *ob, BOOL is_esmtp,
986 smtp_inblock *ibp, smtp_outblock *obp)
987 {
988 int require_auth;
989 uschar *fail_reason = US"server did not advertise AUTH support";
990
991 smtp_authenticated = FALSE;
992 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
993 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
994
995 if (is_esmtp && !regex_AUTH) regex_AUTH =
996 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
997 FALSE, TRUE);
998
999 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1000 {
1001 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1002 expand_nmax = -1; /* reset */
1003
1004 /* Must not do this check until after we have saved the result of the
1005 regex match above. */
1006
1007 if (require_auth == OK ||
1008 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1009 {
1010 auth_instance *au;
1011 fail_reason = US"no common mechanisms were found";
1012
1013 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1014
1015 /* Scan the configured authenticators looking for one which is configured
1016 for use as a client, which is not suppressed by client_condition, and
1017 whose name matches an authentication mechanism supported by the server.
1018 If one is found, attempt to authenticate by calling its client function.
1019 */
1020
1021 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1022 {
1023 uschar *p = names;
1024 if (!au->client ||
1025 (au->client_condition != NULL &&
1026 !expand_check_condition(au->client_condition, au->name,
1027 US"client authenticator")))
1028 {
1029 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1030 au->name,
1031 (au->client)? "client_condition is false" :
1032 "not configured as a client");
1033 continue;
1034 }
1035
1036 /* Loop to scan supported server mechanisms */
1037
1038 while (*p != 0)
1039 {
1040 int rc;
1041 int len = Ustrlen(au->public_name);
1042 while (isspace(*p)) p++;
1043
1044 if (strncmpic(au->public_name, p, len) != 0 ||
1045 (p[len] != 0 && !isspace(p[len])))
1046 {
1047 while (*p != 0 && !isspace(*p)) p++;
1048 continue;
1049 }
1050
1051 /* Found data for a listed mechanism. Call its client entry. Set
1052 a flag in the outblock so that data is overwritten after sending so
1053 that reflections don't show it. */
1054
1055 fail_reason = US"authentication attempt(s) failed";
1056 obp->authenticating = TRUE;
1057 rc = (au->info->clientcode)(au, ibp, obp,
1058 ob->command_timeout, buffer, bufsize);
1059 obp->authenticating = FALSE;
1060 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1061 au->name, rc);
1062
1063 /* A temporary authentication failure must hold up delivery to
1064 this host. After a permanent authentication failure, we carry on
1065 to try other authentication methods. If all fail hard, try to
1066 deliver the message unauthenticated unless require_auth was set. */
1067
1068 switch(rc)
1069 {
1070 case OK:
1071 smtp_authenticated = TRUE; /* stops the outer loop */
1072 client_authenticator = au->name;
1073 if (au->set_client_id != NULL)
1074 client_authenticated_id = expand_string(au->set_client_id);
1075 break;
1076
1077 /* Failure after writing a command */
1078
1079 case FAIL_SEND:
1080 return FAIL_SEND;
1081
1082 /* Failure after reading a response */
1083
1084 case FAIL:
1085 if (errno != 0 || buffer[0] != '5') return FAIL;
1086 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1087 au->name, host->name, host->address, buffer);
1088 break;
1089
1090 /* Failure by some other means. In effect, the authenticator
1091 decided it wasn't prepared to handle this case. Typically this
1092 is the result of "fail" in an expansion string. Do we need to
1093 log anything here? Feb 2006: a message is now put in the buffer
1094 if logging is required. */
1095
1096 case CANCELLED:
1097 if (*buffer != 0)
1098 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1099 "authentication H=%s [%s] %s", au->name, host->name,
1100 host->address, buffer);
1101 break;
1102
1103 /* Internal problem, message in buffer. */
1104
1105 case ERROR:
1106 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1107 DEFER, FALSE);
1108 return ERROR;
1109 }
1110
1111 break; /* If not authenticated, try next authenticator */
1112 } /* Loop for scanning supported server mechanisms */
1113 } /* Loop for further authenticators */
1114 }
1115 }
1116
1117 /* If we haven't authenticated, but are required to, give up. */
1118
1119 if (require_auth == OK && !smtp_authenticated)
1120 {
1121 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1122 string_sprintf("authentication required but %s", fail_reason), DEFER,
1123 FALSE);
1124 return DEFER;
1125 }
1126
1127 return OK;
1128 }
1129
1130
1131 /* Construct AUTH appendix string for MAIL TO */
1132 /*
1133 Arguments
1134 buffer to build string
1135 addrlist chain of potential addresses to deliver
1136 ob transport options
1137
1138 Globals smtp_authenticated
1139 client_authenticated_sender
1140 Return True on error, otherwise buffer has (possibly empty) terminated string
1141 */
1142
1143 BOOL
1144 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1145 smtp_transport_options_block *ob)
1146 {
1147 uschar *local_authenticated_sender = authenticated_sender;
1148
1149 #ifdef notdef
1150 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1151 #endif
1152
1153 if (ob->authenticated_sender != NULL)
1154 {
1155 uschar *new = expand_string(ob->authenticated_sender);
1156 if (new == NULL)
1157 {
1158 if (!expand_string_forcedfail)
1159 {
1160 uschar *message = string_sprintf("failed to expand "
1161 "authenticated_sender: %s", expand_string_message);
1162 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1163 return TRUE;
1164 }
1165 }
1166 else if (new[0] != 0) local_authenticated_sender = new;
1167 }
1168
1169 /* Add the authenticated sender address if present */
1170
1171 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1172 local_authenticated_sender != NULL)
1173 {
1174 string_format(buffer, bufsize, " AUTH=%s",
1175 auth_xtextencode(local_authenticated_sender,
1176 Ustrlen(local_authenticated_sender)));
1177 client_authenticated_sender = string_copy(local_authenticated_sender);
1178 }
1179 else
1180 *buffer= 0;
1181
1182 return FALSE;
1183 }
1184
1185
1186
1187 #ifdef EXPERIMENTAL_DANE
1188 /* Lookup TLSA record for host/port.
1189 Return: OK success with dnssec; DANE mode
1190 DEFER Do not use this host now, may retry later
1191 FAIL_FORCED No TLSA record; DANE not usable
1192 FAIL Do not use this connection
1193 */
1194
1195 int
1196 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1197 {
1198 /* move this out to host.c given the similarity to dns_lookup() ? */
1199 uschar buffer[300];
1200 const uschar * fullname = buffer;
1201 int rc;
1202 BOOL sec;
1203
1204 /* TLSA lookup string */
1205 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1206
1207 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1208 sec = dns_is_secure(dnsa);
1209 DEBUG(D_transport)
1210 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1211
1212 switch (rc)
1213 {
1214 case DNS_SUCCEED:
1215 if (sec) return OK;
1216
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 /*FALLTHROUGH*/
1219 case DNS_AGAIN:
1220 return DEFER; /* just defer this TLS'd conn */
1221
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
1224 return dane_required ? FAIL : FAIL_FORCED;
1225
1226 default:
1227 case DNS_FAIL:
1228 return dane_required ? FAIL : DEFER;
1229 }
1230 }
1231 #endif
1232
1233
1234
1235 typedef struct smtp_compare_s
1236 {
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1239 } smtp_compare_t;
1240
1241
1242 /* Create a unique string that identifies this message, it is based on
1243 sender_address, helo_data and tls_certificate if enabled.
1244 */
1245
1246 static uschar *
1247 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1248 {
1249 address_item * addr1;
1250 uschar * if1 = US"";
1251 uschar * helo1 = US"";
1252 #ifdef SUPPORT_TLS
1253 uschar * tlsc1 = US"";
1254 #endif
1255 uschar * save_sender_address = sender_address;
1256 uschar * local_identity = NULL;
1257 smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1259
1260 sender_address = sender;
1261
1262 addr1 = deliver_make_addr (sender, TRUE);
1263 deliver_set_expansions(addr1);
1264
1265 if (ob->interface)
1266 if1 = expand_string(ob->interface);
1267
1268 if (ob->helo_data)
1269 helo1 = expand_string(ob->helo_data);
1270
1271 #ifdef SUPPORT_TLS
1272 if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1275 #else
1276 local_identity = string_sprintf ("%s^%s", if1, helo1);
1277 #endif
1278
1279 deliver_set_expansions(NULL);
1280 sender_address = save_sender_address;
1281
1282 return local_identity;
1283 }
1284
1285
1286
1287 /* This routine is a callback that is called from transport_check_waiting.
1288 This function will evaluate the incoming message versus the previous
1289 message. If the incoming message is using a different local identity then
1290 we will veto this new message. */
1291
1292 static BOOL
1293 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1294 {
1295 uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1298
1299 current_local_identity =
1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1301
1302 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1303 return 0;
1304
1305 message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
1307
1308 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1309 }
1310
1311
1312
1313 static uschar
1314 ehlo_response(uschar * buf, uschar checks)
1315 {
1316 size_t bsize = Ustrlen(buf);
1317
1318 #ifdef SUPPORT_TLS
1319 if ( checks & PEER_OFFERED_TLS
1320 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1321 checks &= ~PEER_OFFERED_TLS;
1322 #endif
1323
1324 if ( checks & PEER_OFFERED_IGNQ
1325 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~PEER_OFFERED_IGNQ;
1328
1329 if ( checks & PEER_OFFERED_CHUNKING
1330 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_CHUNKING;
1332
1333 #ifndef DISABLE_PRDR
1334 if ( checks & PEER_OFFERED_PRDR
1335 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_PRDR;
1337 #endif
1338
1339 #ifdef SUPPORT_I18N
1340 if ( checks & PEER_OFFERED_UTF8
1341 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_UTF8;
1343 #endif
1344
1345 if ( checks & PEER_OFFERED_DSN
1346 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_DSN;
1348
1349 if ( checks & PEER_OFFERED_PIPE
1350 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1351 PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~PEER_OFFERED_PIPE;
1353
1354 if ( checks & PEER_OFFERED_SIZE
1355 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~PEER_OFFERED_SIZE;
1357
1358 return checks;
1359 }
1360
1361
1362
1363 /* Callback for emitting a BDAT data chunk header.
1364
1365 If given a nonzero size, first flush any buffered SMTP commands
1366 then emit the command.
1367
1368 Reap previous SMTP command responses if requested, and always reap
1369 the response from a previous BDAT command.
1370
1371 Args:
1372 tctx transport context
1373 chunk_size value for SMTP BDAT command
1374 flags
1375 tc_chunk_last add LAST option to SMTP BDAT command
1376 tc_reap_prev reap response to previous SMTP commands
1377
1378 Returns: OK or ERROR
1379 */
1380
1381 static int
1382 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1383 unsigned flags)
1384 {
1385 smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 smtp_context * sx = tctx->smtp_context;
1388 int cmd_count = 0;
1389 int prev_cmd_count;
1390
1391 /* Write SMTP chunk header command. If not reaping responses, note that
1392 there may be more writes (like, the chunk data) done soon. */
1393
1394 if (chunk_size > 0)
1395 {
1396 if((cmd_count = smtp_write_command(&sx->outblock,
1397 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1398 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1399 ) < 0) return ERROR;
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1402 }
1403
1404 prev_cmd_count = cmd_count += sx->cmd_count;
1405
1406 /* Reap responses for any previous, but not one we just emitted */
1407
1408 if (chunk_size > 0)
1409 prev_cmd_count--;
1410 if (sx->pending_BDAT)
1411 prev_cmd_count--;
1412
1413 if (flags & tc_reap_prev && prev_cmd_count > 0)
1414 {
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
1417
1418 switch(sync_responses(sx, prev_cmd_count, 0))
1419 {
1420 case 1: /* 2xx (only) => OK */
1421 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1424
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1427 }
1428 cmd_count = 1;
1429 if (!sx->pending_BDAT)
1430 pipelining_active = FALSE;
1431 }
1432
1433 /* Reap response for an outstanding BDAT */
1434
1435 if (sx->pending_BDAT)
1436 {
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1438
1439 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1440 ob->command_timeout))
1441 {
1442 if (errno == 0 && sx->buffer[0] == '4')
1443 {
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1445 sx->addrlist->more_errno |=
1446 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1447 }
1448 return ERROR;
1449 }
1450 cmd_count--;
1451 sx->pending_BDAT = FALSE;
1452 pipelining_active = FALSE;
1453 }
1454 else if (chunk_size > 0)
1455 sx->pending_BDAT = TRUE;
1456
1457
1458 sx->cmd_count = cmd_count;
1459 return OK;
1460 }
1461
1462
1463
1464 /*************************************************
1465 * Make connection for given message *
1466 *************************************************/
1467
1468 /*
1469 Arguments:
1470 ctx connection context
1471 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1472 a second attempt after TLS initialization fails
1473
1474 Returns: OK - the connection was made and the delivery attempted;
1475 fd is set in the conn context, tls_out set up.
1476 DEFER - the connection could not be made, or something failed
1477 while setting up the SMTP session, or there was a
1478 non-message-specific error, such as a timeout.
1479 ERROR - helo_data or add_headers or authenticated_sender is
1480 specified for this transport, and the string failed
1481 to expand
1482 */
1483 int
1484 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1485 {
1486 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1487 dns_answer tlsa_dnsa;
1488 #endif
1489 BOOL pass_message = FALSE;
1490 uschar * message = NULL;
1491 int yield = OK;
1492 int rc;
1493
1494 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1495
1496 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1497 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1498 sx->ok = FALSE;
1499 sx->send_rset = TRUE;
1500 sx->send_quit = TRUE;
1501 sx->setting_up = TRUE;
1502 sx->esmtp = TRUE;
1503 sx->esmtp_sent = FALSE;
1504 #ifdef SUPPORT_I18N
1505 sx->utf8_needed = FALSE;
1506 #endif
1507 sx->dsn_all_lasthop = TRUE;
1508 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1509 sx->dane = FALSE;
1510 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1511 #endif
1512
1513 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1514 sx->peer_offered = 0;
1515 sx->igquotstr = US"";
1516 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1517 #ifdef EXPERIMENTAL_DSN_INFO
1518 sx->smtp_greeting = NULL;
1519 sx->helo_response = NULL;
1520 #endif
1521
1522 smtp_command = US"initial connection";
1523 sx->buffer[0] = '\0';
1524
1525 /* Set up the buffer for reading SMTP response packets. */
1526
1527 sx->inblock.buffer = sx->inbuffer;
1528 sx->inblock.buffersize = sizeof(sx->inbuffer);
1529 sx->inblock.ptr = sx->inbuffer;
1530 sx->inblock.ptrend = sx->inbuffer;
1531
1532 /* Set up the buffer for holding SMTP commands while pipelining */
1533
1534 sx->outblock.buffer = sx->outbuffer;
1535 sx->outblock.buffersize = sizeof(sx->outbuffer);
1536 sx->outblock.ptr = sx->outbuffer;
1537 sx->outblock.cmd_count = 0;
1538 sx->outblock.authenticating = FALSE;
1539
1540 /* Reset the parameters of a TLS session. */
1541
1542 tls_out.bits = 0;
1543 tls_out.cipher = NULL; /* the one we may use for this transport */
1544 tls_out.ourcert = NULL;
1545 tls_out.peercert = NULL;
1546 tls_out.peerdn = NULL;
1547 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1548 tls_out.sni = NULL;
1549 #endif
1550 tls_out.ocsp = OCSP_NOT_REQ;
1551
1552 /* Flip the legacy TLS-related variables over to the outbound set in case
1553 they're used in the context of the transport. Don't bother resetting
1554 afterward (when being used by a transport) as we're in a subprocess.
1555 For verify, unflipped once the callout is dealt with */
1556
1557 tls_modify_variables(&tls_out);
1558
1559 #ifndef SUPPORT_TLS
1560 if (sx->smtps)
1561 {
1562 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1563 DEFER, FALSE);
1564 return ERROR;
1565 }
1566 #endif
1567
1568 /* Make a connection to the host if this isn't a continued delivery, and handle
1569 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1570 specially so they can be identified for retries. */
1571
1572 if (!continue_hostname)
1573 {
1574 if (sx->verify)
1575 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1576
1577 /* Get the actual port the connection will use, into sx->host */
1578
1579 smtp_port_for_connect(sx->host, sx->port);
1580
1581 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1582 /* Do TLSA lookup for DANE */
1583 {
1584 tls_out.dane_verified = FALSE;
1585 tls_out.tlsa_usage = 0;
1586
1587 if (sx->host->dnssec == DS_YES)
1588 {
1589 if( sx->dane_required
1590 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1591 )
1592 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1593 {
1594 case OK: sx->dane = TRUE;
1595 sx->ob->tls_tempfail_tryclear = FALSE;
1596 break;
1597 case FAIL_FORCED: break;
1598 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1599 string_sprintf("DANE error: tlsa lookup %s",
1600 rc == DEFER ? "DEFER" : "FAIL"),
1601 rc, FALSE);
1602 return rc;
1603 }
1604 }
1605 else if (sx->dane_required)
1606 {
1607 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1608 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1609 FAIL, FALSE);
1610 return FAIL;
1611 }
1612 }
1613 #endif /*DANE*/
1614
1615 /* Make the TCP connection */
1616
1617 sx->inblock.sock = sx->outblock.sock =
1618 smtp_connect(sx->host, sx->host_af, sx->interface,
1619 sx->ob->connect_timeout, sx->tblock);
1620
1621 if (sx->inblock.sock < 0)
1622 {
1623 uschar * msg = NULL;
1624 if (sx->verify)
1625 {
1626 msg = US strerror(errno);
1627 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1628 }
1629 set_errno_nohost(sx->addrlist,
1630 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1631 sx->verify ? string_sprintf("could not connect: %s", msg)
1632 : NULL,
1633 DEFER, FALSE);
1634 sx->send_quit = FALSE;
1635 return DEFER;
1636 }
1637
1638 /* Expand the greeting message while waiting for the initial response. (Makes
1639 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1640 delayed till here so that $sending_interface and $sending_port are set. */
1641
1642 if (sx->helo_data)
1643 if (!(sx->helo_data = expand_string(sx->helo_data)))
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
1649 #ifdef SUPPORT_I18N
1650 if (sx->helo_data)
1651 {
1652 expand_string_message = NULL;
1653 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1654 &expand_string_message)),
1655 expand_string_message)
1656 if (sx->verify)
1657 log_write(0, LOG_MAIN|LOG_PANIC,
1658 "<%s>: failed to expand transport's helo_data value for callout: %s",
1659 sx->addrlist->address, expand_string_message);
1660 else
1661 sx->helo_data = NULL;
1662 }
1663 #endif
1664
1665 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1666 is nevertheless a reasonably clean way of programming this kind of logic,
1667 where you want to escape on any error. */
1668
1669 if (!sx->smtps)
1670 {
1671 BOOL good_response;
1672
1673 #ifdef TCP_QUICKACK
1674 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1675 #endif
1676 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1677 '2', sx->ob->command_timeout);
1678 #ifdef EXPERIMENTAL_DSN_INFO
1679 sx->smtp_greeting = string_copy(sx->buffer);
1680 #endif
1681 if (!good_response) goto RESPONSE_FAILED;
1682
1683 #ifndef DISABLE_EVENT
1684 {
1685 uschar * s;
1686 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1687 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1688 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1689 if (s)
1690 {
1691 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1692 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1693 DEFER, FALSE);
1694 yield = DEFER;
1695 goto SEND_QUIT;
1696 }
1697 }
1698 #endif
1699
1700 /* Now check if the helo_data expansion went well, and sign off cleanly if
1701 it didn't. */
1702
1703 if (!sx->helo_data)
1704 {
1705 message = string_sprintf("failed to expand helo_data: %s",
1706 expand_string_message);
1707 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1708 yield = DEFER;
1709 goto SEND_QUIT;
1710 }
1711 }
1712
1713 /** Debugging without sending a message
1714 sx->addrlist->transport_return = DEFER;
1715 goto SEND_QUIT;
1716 **/
1717
1718 /* Errors that occur after this point follow an SMTP command, which is
1719 left in big_buffer by smtp_write_command() for use in error messages. */
1720
1721 smtp_command = big_buffer;
1722
1723 /* Tell the remote who we are...
1724
1725 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1726 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1727 greeting is of this form. The assumption was that the far end supports it
1728 properly... but experience shows that there are some that give 5xx responses,
1729 even though the banner includes "ESMTP" (there's a bloody-minded one that
1730 says "ESMTP not spoken here"). Cope with that case.
1731
1732 September 2000: Time has passed, and it seems reasonable now to always send
1733 EHLO at the start. It is also convenient to make the change while installing
1734 the TLS stuff.
1735
1736 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1737 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1738 would be no way to send out the mails, so there is now a host list
1739 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1740 PIPELINING problem as well. Maybe it can also be useful to cure other
1741 problems with broken servers.
1742
1743 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1744 Then somebody tried it with a Microsoft mailer... It seems that all other
1745 mailers use upper case for some reason (the RFC is quite clear about case
1746 independence) so, for peace of mind, I gave in. */
1747
1748 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1749
1750 /* Alas; be careful, since this goto is not an error-out, so conceivably
1751 we might set data between here and the target which we assume to exist
1752 and be usable. I can see this coming back to bite us. */
1753 #ifdef SUPPORT_TLS
1754 if (sx->smtps)
1755 {
1756 smtp_peer_options |= PEER_OFFERED_TLS;
1757 suppress_tls = FALSE;
1758 sx->ob->tls_tempfail_tryclear = FALSE;
1759 smtp_command = US"SSL-on-connect";
1760 goto TLS_NEGOTIATE;
1761 }
1762 #endif
1763
1764 if (sx->esmtp)
1765 {
1766 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1767 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1768 goto SEND_FAILED;
1769 sx->esmtp_sent = TRUE;
1770 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1771 sx->ob->command_timeout))
1772 {
1773 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1774 {
1775 #ifdef EXPERIMENTAL_DSN_INFO
1776 sx->helo_response = string_copy(sx->buffer);
1777 #endif
1778 goto RESPONSE_FAILED;
1779 }
1780 sx->esmtp = FALSE;
1781 }
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(sx->buffer);
1784 #endif
1785 }
1786 else
1787 DEBUG(D_transport)
1788 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1789
1790 if (!sx->esmtp)
1791 {
1792 BOOL good_response;
1793 int n = sizeof(sx->buffer);
1794 uschar * rsp = sx->buffer;
1795
1796 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1797 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1798
1799 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1800 goto SEND_FAILED;
1801 good_response = smtp_read_response(&sx->inblock, rsp, n,
1802 '2', sx->ob->command_timeout);
1803 #ifdef EXPERIMENTAL_DSN_INFO
1804 sx->helo_response = string_copy(rsp);
1805 #endif
1806 if (!good_response)
1807 {
1808 /* Handle special logging for a closed connection after HELO
1809 when had previously sent EHLO */
1810
1811 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1812 {
1813 errno = ERRNO_SMTPCLOSED;
1814 goto EHLOHELO_FAILED;
1815 }
1816 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1817 goto RESPONSE_FAILED;
1818 }
1819 }
1820
1821 sx->peer_offered = smtp_peer_options = 0;
1822
1823 if (sx->esmtp || sx->lmtp)
1824 {
1825 sx->peer_offered = ehlo_response(sx->buffer,
1826 PEER_OFFERED_TLS /* others checked later */
1827 );
1828
1829 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1830
1831 #ifdef SUPPORT_TLS
1832 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1833 #endif
1834 }
1835 }
1836
1837 /* For continuing deliveries down the same channel, having re-exec'd the socket
1838 is the standard input; for a socket held open from verify it is recorded
1839 in the cutthrough context block. Either way we don't need to redo EHLO here
1840 (but may need to do so for TLS - see below).
1841 Set up the pointer to where subsequent commands will be left, for
1842 error messages. Note that smtp_peer_options will have been
1843 set from the command line if they were set in the process that passed the
1844 connection on. */
1845
1846 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1847 as the continue goes via transport_pass_socket() and doublefork and exec.
1848 It does not wait. Unclear how we keep separate host's responses
1849 separate - we could match up by host ip+port as a bodge. */
1850
1851 else
1852 {
1853 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1854 {
1855 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1856 sx->host->port = sx->port = cutthrough.host.port;
1857 }
1858 else
1859 {
1860 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1861 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1862 }
1863 smtp_command = big_buffer;
1864 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1865
1866 /* For a continued connection with TLS being proxied for us, or a
1867 held-open verify connection with TLS, nothing more to do. */
1868
1869 if ( continue_proxy_cipher
1870 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1871 )
1872 {
1873 sx->peer_offered = smtp_peer_options;
1874 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1875 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1876 continue_proxy_cipher ? "proxied" : "verify conn with");
1877 return OK;
1878 }
1879 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1880 }
1881
1882 /* If TLS is available on this connection, whether continued or not, attempt to
1883 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1884 send another EHLO - the server may give a different answer in secure mode. We
1885 use a separate buffer for reading the response to STARTTLS so that if it is
1886 negative, the original EHLO data is available for subsequent analysis, should
1887 the client not be required to use TLS. If the response is bad, copy the buffer
1888 for error analysis. */
1889
1890 #ifdef SUPPORT_TLS
1891 if ( smtp_peer_options & PEER_OFFERED_TLS
1892 && !suppress_tls
1893 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1894 && ( !sx->verify
1895 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1896 ) )
1897 {
1898 uschar buffer2[4096];
1899 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1900 goto SEND_FAILED;
1901
1902 /* If there is an I/O error, transmission of this message is deferred. If
1903 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1904 false, we also defer. However, if there is a temporary rejection of STARTTLS
1905 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1906 STARTTLS, we carry on. This means we will try to send the message in clear,
1907 unless the host is in hosts_require_tls (tested below). */
1908
1909 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1910 sx->ob->command_timeout))
1911 {
1912 if ( errno != 0
1913 || buffer2[0] == 0
1914 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1915 )
1916 {
1917 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1918 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1919 goto RESPONSE_FAILED;
1920 }
1921 }
1922
1923 /* STARTTLS accepted: try to negotiate a TLS session. */
1924
1925 else
1926 TLS_NEGOTIATE:
1927 {
1928 address_item * addr;
1929 uschar * errstr;
1930 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1931 # ifdef EXPERIMENTAL_DANE
1932 sx->dane ? &tlsa_dnsa : NULL,
1933 # endif
1934 &errstr);
1935
1936 /* TLS negotiation failed; give an error. From outside, this function may
1937 be called again to try in clear on a new connection, if the options permit
1938 it for this host. */
1939
1940 if (rc != OK)
1941 {
1942 # ifdef EXPERIMENTAL_DANE
1943 if (sx->dane) log_write(0, LOG_MAIN,
1944 "DANE attempt failed; TLS connection to %s [%s]: %s",
1945 sx->host->name, sx->host->address, errstr);
1946 # endif
1947
1948 errno = ERRNO_TLSFAILURE;
1949 message = string_sprintf("TLS session: %s", errstr);
1950 sx->send_quit = FALSE;
1951 goto TLS_FAILED;
1952 }
1953
1954 /* TLS session is set up */
1955
1956 smtp_peer_options_wrap = smtp_peer_options;
1957 for (addr = sx->addrlist; addr; addr = addr->next)
1958 if (addr->transport_return == PENDING_DEFER)
1959 {
1960 addr->cipher = tls_out.cipher;
1961 addr->ourcert = tls_out.ourcert;
1962 addr->peercert = tls_out.peercert;
1963 addr->peerdn = tls_out.peerdn;
1964 addr->ocsp = tls_out.ocsp;
1965 }
1966 }
1967 }
1968
1969 /* if smtps, we'll have smtp_command set to something else; always safe to
1970 reset it here. */
1971 smtp_command = big_buffer;
1972
1973 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1974 helo_data is null, we are dealing with a connection that was passed from
1975 another process, and so we won't have expanded helo_data above. We have to
1976 expand it here. $sending_ip_address and $sending_port are set up right at the
1977 start of the Exim process (in exim.c). */
1978
1979 if (tls_out.active >= 0)
1980 {
1981 char *greeting_cmd;
1982 BOOL good_response;
1983
1984 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1985 {
1986 uschar *message = string_sprintf("failed to expand helo_data: %s",
1987 expand_string_message);
1988 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1989 yield = DEFER;
1990 goto SEND_QUIT;
1991 }
1992
1993 /* For SMTPS we need to wait for the initial OK response. */
1994 if (sx->smtps)
1995 {
1996 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1997 '2', sx->ob->command_timeout);
1998 #ifdef EXPERIMENTAL_DSN_INFO
1999 sx->smtp_greeting = string_copy(sx->buffer);
2000 #endif
2001 if (!good_response) goto RESPONSE_FAILED;
2002 }
2003
2004 if (sx->esmtp)
2005 greeting_cmd = "EHLO";
2006 else
2007 {
2008 greeting_cmd = "HELO";
2009 DEBUG(D_transport)
2010 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2011 }
2012
2013 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2014 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2015 goto SEND_FAILED;
2016 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2017 '2', sx->ob->command_timeout);
2018 #ifdef EXPERIMENTAL_DSN_INFO
2019 sx->helo_response = string_copy(sx->buffer);
2020 #endif
2021 if (!good_response) goto RESPONSE_FAILED;
2022 smtp_peer_options = 0;
2023 }
2024
2025 /* If the host is required to use a secure channel, ensure that we
2026 have one. */
2027
2028 else if ( sx->smtps
2029 # ifdef EXPERIMENTAL_DANE
2030 || sx->dane
2031 # endif
2032 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2033 )
2034 {
2035 errno = ERRNO_TLSREQUIRED;
2036 message = string_sprintf("a TLS session is required, but %s",
2037 smtp_peer_options & PEER_OFFERED_TLS
2038 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2039 goto TLS_FAILED;
2040 }
2041 #endif /*SUPPORT_TLS*/
2042
2043 /* If TLS is active, we have just started it up and re-done the EHLO command,
2044 so its response needs to be analyzed. If TLS is not active and this is a
2045 continued session down a previously-used socket, we haven't just done EHLO, so
2046 we skip this. */
2047
2048 if (continue_hostname == NULL
2049 #ifdef SUPPORT_TLS
2050 || tls_out.active >= 0
2051 #endif
2052 )
2053 {
2054 if (sx->esmtp || sx->lmtp)
2055 {
2056 sx->peer_offered = ehlo_response(sx->buffer,
2057 0 /* no TLS */
2058 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2059 | PEER_OFFERED_CHUNKING
2060 | PEER_OFFERED_PRDR
2061 #ifdef SUPPORT_I18N
2062 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2063 /*XXX if we hand peercaps on to continued-conn processes,
2064 must not depend on this addr */
2065 #endif
2066 | PEER_OFFERED_DSN
2067 | PEER_OFFERED_PIPE
2068 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2069 );
2070
2071 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2072 lmtp_ignore_quota option was set. */
2073
2074 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2075
2076 /* If the response to EHLO specified support for the SIZE parameter, note
2077 this, provided size_addition is non-negative. */
2078
2079 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2080
2081 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2082 the current host, esmtp will be false, so PIPELINING can never be used. If
2083 the current host matches hosts_avoid_pipelining, don't do it. */
2084
2085 if ( sx->peer_offered & PEER_OFFERED_PIPE
2086 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2087 smtp_peer_options |= PEER_OFFERED_PIPE;
2088
2089 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2090 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2091
2092 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2093 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2094 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2095
2096 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2097 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2098
2099 #ifndef DISABLE_PRDR
2100 if ( sx->peer_offered & PEER_OFFERED_PRDR
2101 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2102 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2103
2104 if (sx->peer_offered & PEER_OFFERED_PRDR)
2105 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2106 #endif
2107
2108 /* Note if the server supports DSN */
2109 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2110 DEBUG(D_transport) debug_printf("%susing DSN\n",
2111 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2112
2113 /* Note if the response to EHLO specifies support for the AUTH extension.
2114 If it has, check that this host is one we want to authenticate to, and do
2115 the business. The host name and address must be available when the
2116 authenticator's client driver is running. */
2117
2118 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2119 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2120 {
2121 default: goto SEND_QUIT;
2122 case OK: break;
2123 case FAIL_SEND: goto SEND_FAILED;
2124 case FAIL: goto RESPONSE_FAILED;
2125 }
2126 }
2127 }
2128 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2129
2130 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2131 message-specific. */
2132
2133 sx->setting_up = FALSE;
2134
2135 #ifdef SUPPORT_I18N
2136 if (sx->addrlist->prop.utf8_msg)
2137 {
2138 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2139 && !sx->addrlist->prop.utf8_downcvt_maybe;
2140 DEBUG(D_transport) if (!sx->utf8_needed)
2141 debug_printf("utf8: %s downconvert\n",
2142 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2143 }
2144
2145 /* If this is an international message we need the host to speak SMTPUTF8 */
2146 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2147 {
2148 errno = ERRNO_UTF8_FWD;
2149 goto RESPONSE_FAILED;
2150 }
2151 #endif
2152
2153 return OK;
2154
2155
2156 {
2157 int code;
2158
2159 RESPONSE_FAILED:
2160 message = NULL;
2161 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2162 sx->buffer, &code, &message, &pass_message);
2163 goto FAILED;
2164
2165 SEND_FAILED:
2166 code = '4';
2167 message = US string_sprintf("send() to %s [%s] failed: %s",
2168 sx->host->name, sx->host->address, strerror(errno));
2169 sx->send_quit = FALSE;
2170 goto FAILED;
2171
2172 /* This label is jumped to directly when a TLS negotiation has failed,
2173 or was not done for a host for which it is required. Values will be set
2174 in message and errno, and setting_up will always be true. Treat as
2175 a temporary error. */
2176
2177 EHLOHELO_FAILED:
2178 code = '4';
2179 message = string_sprintf("Remote host closed connection in response to %s"
2180 " (EHLO response was: %s)", smtp_command, sx->buffer);
2181 sx->send_quit = FALSE;
2182 goto FAILED;
2183
2184 #ifdef SUPPORT_TLS
2185 TLS_FAILED:
2186 code = '4';
2187 goto FAILED;
2188 #endif
2189
2190 /* The failure happened while setting up the call; see if the failure was
2191 a 5xx response (this will either be on connection, or following HELO - a 5xx
2192 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2193 fail all addresses, as this host is never going to accept them. For other
2194 errors during setting up (timeouts or whatever), defer all addresses, and
2195 yield DEFER, so that the host is not tried again for a while.
2196
2197 XXX This peeking for another host feels like a layering violation. We want
2198 to note the host as unusable, but down here we shouldn't know if this was
2199 the last host to try for the addr(list). Perhaps the upper layer should be
2200 the one to do set_errno() ? The problem is that currently the addr is where
2201 errno etc. are stashed, but until we run out of hosts to try the errors are
2202 host-specific. Maybe we should enhance the host_item definition? */
2203
2204 FAILED:
2205 sx->ok = FALSE; /* For when reached by GOTO */
2206 set_errno(sx->addrlist, errno, message,
2207 sx->host->next
2208 ? DEFER
2209 : code == '5'
2210 #ifdef SUPPORT_I18N
2211 || errno == ERRNO_UTF8_FWD
2212 #endif
2213 ? FAIL : DEFER,
2214 pass_message, sx->host
2215 #ifdef EXPERIMENTAL_DSN_INFO
2216 , sx->smtp_greeting, sx->helo_response
2217 #endif
2218 );
2219 yield = DEFER;
2220 }
2221
2222
2223 SEND_QUIT:
2224
2225 if (sx->send_quit)
2226 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2227
2228 #ifdef SUPPORT_TLS
2229 tls_close(FALSE, TRUE);
2230 #endif
2231
2232 /* Close the socket, and return the appropriate value, first setting
2233 works because the NULL setting is passed back to the calling process, and
2234 remote_max_parallel is forced to 1 when delivering over an existing connection,
2235 */
2236
2237 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2238 if (sx->send_quit)
2239 {
2240 shutdown(sx->outblock.sock, SHUT_WR);
2241 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2242 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2243 rc--; /* drain socket */
2244 sx->send_quit = FALSE;
2245 }
2246 (void)close(sx->inblock.sock);
2247 sx->inblock.sock = sx->outblock.sock = -1;
2248
2249 #ifndef DISABLE_EVENT
2250 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2251 #endif
2252
2253 continue_transport = NULL;
2254 continue_hostname = NULL;
2255 return yield;
2256 }
2257
2258
2259
2260
2261 /* Create the string of options that will be appended to the MAIL FROM:
2262 in the connection context buffer */
2263
2264 static int
2265 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2266 {
2267 uschar * p = sx->buffer;
2268 address_item * addr;
2269 int address_count;
2270
2271 *p = 0;
2272
2273 /* If we know the receiving MTA supports the SIZE qualification,
2274 send it, adding something to the message size to allow for imprecision
2275 and things that get added en route. Exim keeps the number of lines
2276 in a message, so we can give an accurate value for the original message, but we
2277 need some additional to handle added headers. (Double "." characters don't get
2278 included in the count.) */
2279
2280 if (sx->peer_offered & PEER_OFFERED_SIZE)
2281 {
2282 /*XXX problem here under spool_files_wireformat?
2283 Or just forget about lines? Or inflate by a fixed proportion? */
2284
2285 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2286 while (*p) p++;
2287 }
2288
2289 #ifndef DISABLE_PRDR
2290 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2291 request that */
2292
2293 sx->prdr_active = FALSE;
2294 if (sx->peer_offered & PEER_OFFERED_PRDR)
2295 for (addr = addrlist; addr; addr = addr->next)
2296 if (addr->transport_return == PENDING_DEFER)
2297 {
2298 for (addr = addr->next; addr; addr = addr->next)
2299 if (addr->transport_return == PENDING_DEFER)
2300 { /* at least two recipients to send */
2301 sx->prdr_active = TRUE;
2302 sprintf(CS p, " PRDR"); p += 5;
2303 break;
2304 }
2305 break;
2306 }
2307 #endif
2308
2309 #ifdef SUPPORT_I18N
2310 /* If it supports internationalised messages, and this meesage need that,
2311 request it */
2312
2313 if ( sx->peer_offered & PEER_OFFERED_UTF8
2314 && addrlist->prop.utf8_msg
2315 && !addrlist->prop.utf8_downcvt
2316 )
2317 Ustrcpy(p, " SMTPUTF8"), p += 9;
2318 #endif
2319
2320 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2321 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2322 addr && address_count < sx->max_rcpt;
2323 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2324 {
2325 address_count++;
2326 if (!(addr->dsn_flags & rf_dsnlasthop))
2327 {
2328 sx->dsn_all_lasthop = FALSE;
2329 break;
2330 }
2331 }
2332
2333 /* Add any DSN flags to the mail command */
2334
2335 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2336 {
2337 if (dsn_ret == dsn_ret_hdrs)
2338 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2339 else if (dsn_ret == dsn_ret_full)
2340 { Ustrcpy(p, " RET=FULL"); p += 9; }
2341
2342 if (dsn_envid)
2343 {
2344 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2345 while (*p) p++;
2346 }
2347 }
2348
2349 /* If an authenticated_sender override has been specified for this transport
2350 instance, expand it. If the expansion is forced to fail, and there was already
2351 an authenticated_sender for this message, the original value will be used.
2352 Other expansion failures are serious. An empty result is ignored, but there is
2353 otherwise no check - this feature is expected to be used with LMTP and other
2354 cases where non-standard addresses (e.g. without domains) might be required. */
2355
2356 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2357 return ERROR;
2358
2359 return OK;
2360 }
2361
2362
2363 static void
2364 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2365 {
2366 uschar * p = sx->buffer;
2367 *p = 0;
2368
2369 /* Add any DSN flags to the rcpt command */
2370
2371 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2372 {
2373 if (addr->dsn_flags & rf_dsnflags)
2374 {
2375 int i;
2376 BOOL first = TRUE;
2377
2378 Ustrcpy(p, " NOTIFY=");
2379 while (*p) p++;
2380 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2381 {
2382 if (!first) *p++ = ',';
2383 first = FALSE;
2384 Ustrcpy(p, rf_names[i]);
2385 while (*p) p++;
2386 }
2387 }
2388
2389 if (addr->dsn_orcpt)
2390 {
2391 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2392 addr->dsn_orcpt);
2393 while (*p) p++;
2394 }
2395 }
2396 }
2397
2398
2399
2400 /*
2401 Return:
2402 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2403 -1 MAIL response error
2404 -2 any non-MAIL read i/o error
2405 -3 non-MAIL response timeout
2406 -4 internal error; channel still usable
2407 -5 transmit failed
2408 */
2409
2410 int
2411 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2412 {
2413 address_item * addr;
2414 int address_count;
2415 int rc;
2416
2417 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2418 {
2419 *yield = ERROR;
2420 return -4;
2421 }
2422
2423 /* From here until we send the DATA command, we can make use of PIPELINING
2424 if the server host supports it. The code has to be able to check the responses
2425 at any point, for when the buffer fills up, so we write it totally generally.
2426 When PIPELINING is off, each command written reports that it has flushed the
2427 buffer. */
2428
2429 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2430
2431 {
2432 uschar * s = sx->from_addr;
2433 #ifdef SUPPORT_I18N
2434 uschar * errstr = NULL;
2435
2436 /* If we must downconvert, do the from-address here. Remember we had to
2437 for the to-addresses (done below), and also (ugly) for re-doing when building
2438 the delivery log line. */
2439
2440 if ( sx->addrlist->prop.utf8_msg
2441 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2442 )
2443 {
2444 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2445 {
2446 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2447 *yield = ERROR;
2448 return -4;
2449 }
2450 setflag(sx->addrlist, af_utf8_downcvt);
2451 }
2452 #endif
2453
2454 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2455 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2456 }
2457
2458 mail_command = string_copy(big_buffer); /* Save for later error message */
2459
2460 switch(rc)
2461 {
2462 case -1: /* Transmission error */
2463 return -5;
2464
2465 case +1: /* Cmd was sent */
2466 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2467 sx->ob->command_timeout))
2468 {
2469 if (errno == 0 && sx->buffer[0] == '4')
2470 {
2471 errno = ERRNO_MAIL4XX;
2472 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2473 }
2474 return -1;
2475 }
2476 sx->pending_MAIL = FALSE;
2477 break;
2478
2479 /* otherwise zero: command queued for pipeline */
2480 }
2481
2482 /* Pass over all the relevant recipient addresses for this host, which are the
2483 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2484 several before we have to read the responses for those seen so far. This
2485 checking is done by a subroutine because it also needs to be done at the end.
2486 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2487 the next one if not all are sent.
2488
2489 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2490 last address because we want to abort if any recipients have any kind of
2491 problem, temporary or permanent. We know that all recipient addresses will have
2492 the PENDING_DEFER status, because only one attempt is ever made, and we know
2493 that max_rcpt will be large, so all addresses will be done at once.
2494
2495 For verify we flush the pipeline after any (the only) rcpt address. */
2496
2497 for (addr = sx->first_addr, address_count = 0;
2498 addr && address_count < sx->max_rcpt;
2499 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2500 {
2501 int count;
2502 BOOL no_flush;
2503 uschar * rcpt_addr;
2504
2505 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2506 ? dsn_support_yes : dsn_support_no;
2507
2508 address_count++;
2509 no_flush = pipelining_active && !sx->verify
2510 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2511
2512 build_rcptcmd_options(sx, addr);
2513
2514 /* Now send the RCPT command, and process outstanding responses when
2515 necessary. After a timeout on RCPT, we just end the function, leaving the
2516 yield as OK, because this error can often mean that there is a problem with
2517 just one address, so we don't want to delay the host. */
2518
2519 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2520
2521 #ifdef SUPPORT_I18N
2522 if ( testflag(sx->addrlist, af_utf8_downcvt)
2523 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2524 )
2525 {
2526 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2527 errno = ERRNO_EXPANDFAIL;
2528 return -5; /*XXX too harsh? */
2529 }
2530 #endif
2531
2532 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2533 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2534
2535 if (count < 0) return -5;
2536 if (count > 0)
2537 {
2538 switch(sync_responses(sx, count, 0))
2539 {
2540 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2541 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2542 break;
2543
2544 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2545 if (!sx->lmtp) /* can't tell about progress yet */
2546 sx->completed_addr = TRUE;
2547 case 0: /* No 2xx or 5xx, but no probs */
2548 break;
2549
2550 case -1: return -3; /* Timeout on RCPT */
2551 case -2: return -2; /* non-MAIL read i/o error */
2552 default: return -1; /* any MAIL error */
2553 }
2554 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2555 }
2556 } /* Loop for next address */
2557
2558 sx->next_addr = addr;
2559 return 0;
2560 }
2561
2562
2563 #ifdef SUPPORT_TLS
2564 /*****************************************************
2565 * Proxy TLS connection for another transport process *
2566 ******************************************************/
2567 /*
2568 Use the given buffer as a staging area, and select on both the given fd
2569 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2570 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2571 under a timeout.
2572
2573 Arguments:
2574 buf space to use for buffering
2575 bufsiz size of buffer
2576 proxy_fd comms to proxied process
2577 timeout per-read timeout, seconds
2578 */
2579
2580 void
2581 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2582 {
2583 fd_set rfds, efds;
2584 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2585 int rc, i, fd_bits, nbytes;
2586
2587 set_process_info("proxying TLS connection for continued transport");
2588 FD_ZERO(&rfds);
2589 FD_SET(tls_out.active, &rfds);
2590 FD_SET(proxy_fd, &rfds);
2591
2592 for (fd_bits = 3; fd_bits; )
2593 {
2594 time_t time_left = timeout;
2595 time_t time_start = time(NULL);
2596
2597 /* wait for data */
2598 efds = rfds;
2599 do
2600 {
2601 struct timeval tv = { time_left, 0 };
2602
2603 rc = select(max_fd,
2604 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2605
2606 if (rc < 0 && errno == EINTR)
2607 if ((time_left -= time(NULL) - time_start) > 0) continue;
2608
2609 if (rc <= 0)
2610 {
2611 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2612 return;
2613 }
2614
2615 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2616 {
2617 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2618 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2619 return;
2620 }
2621 }
2622 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2623
2624 /* handle inbound data */
2625 if (FD_ISSET(tls_out.active, &rfds))
2626 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2627 {
2628 fd_bits &= ~1;
2629 FD_CLR(tls_out.active, &rfds);
2630 shutdown(proxy_fd, SHUT_WR);
2631 timeout = 5;
2632 }
2633 else
2634 {
2635 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2636 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2637 }
2638 else if (fd_bits & 1)
2639 FD_SET(tls_out.active, &rfds);
2640
2641 /* handle outbound data */
2642 if (FD_ISSET(proxy_fd, &rfds))
2643 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2644 {
2645 fd_bits = 0;
2646 tls_close(FALSE, TRUE);
2647 }
2648 else
2649 {
2650 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2651 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2652 return;
2653 }
2654 else if (fd_bits & 2)
2655 FD_SET(proxy_fd, &rfds);
2656 }
2657 }
2658 #endif
2659
2660
2661 /*************************************************
2662 * Deliver address list to given host *
2663 *************************************************/
2664
2665 /* If continue_hostname is not null, we get here only when continuing to
2666 deliver down an existing channel. The channel was passed as the standard
2667 input. TLS is never active on a passed channel; the previous process always
2668 closes it down before passing the connection on.
2669
2670 Otherwise, we have to make a connection to the remote host, and do the
2671 initial protocol exchange.
2672
2673 When running as an MUA wrapper, if the sender or any recipient is rejected,
2674 temporarily or permanently, we force failure for all recipients.
2675
2676 Arguments:
2677 addrlist chain of potential addresses to deliver; only those whose
2678 transport_return field is set to PENDING_DEFER are currently
2679 being processed; others should be skipped - they have either
2680 been delivered to an earlier host or IP address, or been
2681 failed by one of them.
2682 host host to deliver to
2683 host_af AF_INET or AF_INET6
2684 defport default TCP/IP port to use if host does not specify, in host
2685 byte order
2686 interface interface to bind to, or NULL
2687 tblock transport instance block
2688 message_defer set TRUE if yield is OK, but all addresses were deferred
2689 because of a non-recipient, non-host failure, that is, a
2690 4xx response to MAIL FROM, DATA, or ".". This is a defer
2691 that is specific to the message.
2692 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2693 a second attempt after TLS initialization fails
2694
2695 Returns: OK - the connection was made and the delivery attempted;
2696 the result for each address is in its data block.
2697 DEFER - the connection could not be made, or something failed
2698 while setting up the SMTP session, or there was a
2699 non-message-specific error, such as a timeout.
2700 ERROR - a filter command is specified for this transport,
2701 and there was a problem setting it up; OR helo_data
2702 or add_headers or authenticated_sender is specified
2703 for this transport, and the string failed to expand
2704 */
2705
2706 static int
2707 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2708 uschar *interface, transport_instance *tblock,
2709 BOOL *message_defer, BOOL suppress_tls)
2710 {
2711 address_item *addr;
2712 int yield = OK;
2713 int save_errno;
2714 int rc;
2715 time_t start_delivery_time = time(NULL);
2716
2717 BOOL pass_message = FALSE;
2718 uschar *message = NULL;
2719 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2720 uschar *p;
2721
2722 smtp_context sx;
2723
2724 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2725 *message_defer = FALSE;
2726
2727 sx.addrlist = addrlist;
2728 sx.host = host;
2729 sx.host_af = host_af,
2730 sx.port = defport;
2731 sx.interface = interface;
2732 sx.helo_data = NULL;
2733 sx.tblock = tblock;
2734 sx.verify = FALSE;
2735
2736 /* Get the channel set up ready for a message (MAIL FROM being the next
2737 SMTP command to send */
2738
2739 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2740 return rc;
2741
2742 /* If there is a filter command specified for this transport, we can now
2743 set it up. This cannot be done until the identify of the host is known. */
2744
2745 if (tblock->filter_command)
2746 {
2747 transport_filter_timeout = tblock->filter_timeout;
2748
2749 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2750 yield ERROR. */
2751
2752 if (!transport_set_up_command(&transport_filter_argv,
2753 tblock->filter_command, TRUE, DEFER, addrlist,
2754 string_sprintf("%.50s transport", tblock->name), NULL))
2755 {
2756 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2757 FALSE);
2758 yield = ERROR;
2759 goto SEND_QUIT;
2760 }
2761
2762 if ( transport_filter_argv
2763 && *transport_filter_argv
2764 && **transport_filter_argv
2765 && sx.peer_offered & PEER_OFFERED_CHUNKING
2766 )
2767 {
2768 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2769 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2770 }
2771 }
2772
2773 sx.first_addr = addrlist;
2774
2775 /* For messages that have more than the maximum number of envelope recipients,
2776 we want to send several transactions down the same SMTP connection. (See
2777 comments in deliver.c as to how this reconciles, heuristically, with
2778 remote_max_parallel.) This optimization was added to Exim after the following
2779 code was already working. The simplest way to put it in without disturbing the
2780 code was to use a goto to jump back to this point when there is another
2781 transaction to handle. */
2782
2783 SEND_MESSAGE:
2784 sx.from_addr = return_path;
2785 sx.sync_addr = sx.first_addr;
2786 sx.ok = FALSE;
2787 sx.send_rset = TRUE;
2788 sx.completed_addr = FALSE;
2789
2790
2791 /* If we are a continued-connection-after-verify the MAIL and RCPT
2792 commands were already sent; do not re-send but do mark the addrs as
2793 having been accepted up to RCPT stage. A traditional cont-conn
2794 always has a sequence number greater than one. */
2795
2796 if (continue_hostname && continue_sequence == 1)
2797 {
2798 address_item * addr;
2799
2800 sx.peer_offered = smtp_peer_options;
2801 sx.pending_MAIL = FALSE;
2802 sx.ok = TRUE;
2803 sx.next_addr = NULL;
2804
2805 for (addr = addrlist; addr; addr = addr->next)
2806 addr->transport_return = PENDING_OK;
2807 }
2808 else
2809 {
2810 /* Initiate a message transfer. */
2811
2812 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2813 {
2814 case 0: break;
2815 case -1: case -2: goto RESPONSE_FAILED;
2816 case -3: goto END_OFF;
2817 case -4: goto SEND_QUIT;
2818 default: goto SEND_FAILED;
2819 }
2820
2821 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2822 permanently or temporarily. We should have flushed and synced after the last
2823 RCPT. */
2824
2825 if (mua_wrapper)
2826 {
2827 address_item * a;
2828 unsigned cnt;
2829
2830 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2831 if (a->transport_return != PENDING_OK)
2832 {
2833 /*XXX could we find a better errno than 0 here? */
2834 set_errno_nohost(addrlist, 0, a->message, FAIL,
2835 testflag(a, af_pass_message));
2836 sx.ok = FALSE;
2837 break;
2838 }
2839 }
2840 }
2841
2842 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2843 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2844 have a good recipient buffered up if we are pipelining. We don't want to waste
2845 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2846 are pipelining. The responses are all handled by sync_responses().
2847 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2848 to send is. */
2849
2850 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2851 && (sx.ok || (pipelining_active && !mua_wrapper)))
2852 {
2853 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2854
2855 if (count < 0) goto SEND_FAILED;
2856 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2857 {
2858 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2859 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2860 break;
2861
2862 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2863 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2864 case 0: break; /* No 2xx or 5xx, but no probs */
2865
2866 case -1: goto END_OFF; /* Timeout on RCPT */
2867 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2868 }
2869 pipelining_active = FALSE;
2870 data_command = string_copy(big_buffer); /* Save for later error message */
2871 }
2872
2873 /* If there were no good recipients (but otherwise there have been no
2874 problems), just set ok TRUE, since we have handled address-specific errors
2875 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2876 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2877 well as body. Set the appropriate timeout value to be used for each chunk.
2878 (Haven't been able to make it work using select() for writing yet.) */
2879
2880 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2881 {
2882 /* Save the first address of the next batch. */
2883 sx.first_addr = sx.next_addr;
2884
2885 sx.ok = TRUE;
2886 }
2887 else
2888 {
2889 transport_ctx tctx = {
2890 sx.inblock.sock,
2891 tblock,
2892 addrlist,
2893 US".", US"..", /* Escaping strings */
2894 topt_use_crlf | topt_escape_headers
2895 | (tblock->body_only ? topt_no_headers : 0)
2896 | (tblock->headers_only ? topt_no_body : 0)
2897 | (tblock->return_path_add ? topt_add_return_path : 0)
2898 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2899 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2900 };
2901
2902 /* If using CHUNKING we need a callback from the generic transport
2903 support to us, for the sending of BDAT smtp commands and the reaping
2904 of responses. The callback needs a whole bunch of state so set up
2905 a transport-context structure to be passed around. */
2906
2907 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2908 {
2909 tctx.check_string = tctx.escape_string = NULL;
2910 tctx.options |= topt_use_bdat;
2911 tctx.chunk_cb = smtp_chunk_cmd_callback;
2912 sx.pending_BDAT = FALSE;
2913 sx.good_RCPT = sx.ok;
2914 sx.cmd_count = 0;
2915 tctx.smtp_context = &sx;
2916 }
2917 else
2918 tctx.options |= topt_end_dot;
2919
2920 /* Save the first address of the next batch. */
2921 sx.first_addr = sx.next_addr;
2922
2923 /* Responses from CHUNKING commands go in buffer. Otherwise,
2924 there has not been a response. */
2925
2926 sx.buffer[0] = 0;
2927
2928 sigalrm_seen = FALSE;
2929 transport_write_timeout = sx.ob->data_timeout;
2930 smtp_command = US"sending data block"; /* For error messages */
2931 DEBUG(D_transport|D_v)
2932 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2933 debug_printf(" will write message using CHUNKING\n");
2934 else
2935 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2936 transport_count = 0;
2937
2938 #ifndef DISABLE_DKIM
2939 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2940 #else
2941 sx.ok = transport_write_message(&tctx, 0);
2942 #endif
2943
2944 /* transport_write_message() uses write() because it is called from other
2945 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2946 it can exit with "Broken pipe" as its error. This really means that the
2947 socket got closed at the far end. */
2948
2949 transport_write_timeout = 0; /* for subsequent transports */
2950
2951 /* Failure can either be some kind of I/O disaster (including timeout),
2952 or the failure of a transport filter or the expansion of added headers.
2953 Or, when CHUNKING, it can be a protocol-detected failure. */
2954
2955 if (!sx.ok)
2956 if (message) goto SEND_FAILED;
2957 else goto RESPONSE_FAILED;
2958
2959 /* We used to send the terminating "." explicitly here, but because of
2960 buffering effects at both ends of TCP/IP connections, you don't gain
2961 anything by keeping it separate, so it might as well go in the final
2962 data buffer for efficiency. This is now done by setting the topt_end_dot
2963 flag above. */
2964
2965 smtp_command = US"end of data";
2966
2967 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2968 {
2969 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2970 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2971 {
2972 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2973 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2974 break;
2975
2976 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2977 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2978 case 0: break; /* No 2xx or 5xx, but no probs */
2979
2980 case -1: goto END_OFF; /* Timeout on RCPT */
2981 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2982 }
2983 }
2984
2985 #ifndef DISABLE_PRDR
2986 /* For PRDR we optionally get a partial-responses warning
2987 * followed by the individual responses, before going on with
2988 * the overall response. If we don't get the warning then deal
2989 * with per non-PRDR. */
2990 if(sx.prdr_active)
2991 {
2992 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2993 sx.ob->final_timeout);
2994 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2995 {
2996 case '2': sx.prdr_active = FALSE;
2997 sx.ok = TRUE;
2998 break;
2999 case '4': errno = ERRNO_DATA4XX;
3000 addrlist->more_errno |=
3001 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3002 break;
3003 }
3004 }
3005 else
3006 #endif
3007
3008 /* For non-PRDR SMTP, we now read a single response that applies to the
3009 whole message. If it is OK, then all the addresses have been delivered. */
3010
3011 if (!sx.lmtp)
3012 {
3013 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3014 sx.ob->final_timeout);
3015 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3016 {
3017 errno = ERRNO_DATA4XX;
3018 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3019 }
3020 }
3021
3022 /* For LMTP, we get back a response for every RCPT command that we sent;
3023 some may be accepted and some rejected. For those that get a response, their
3024 status is fixed; any that are accepted have been handed over, even if later
3025 responses crash - at least, that's how I read RFC 2033.
3026
3027 If all went well, mark the recipient addresses as completed, record which
3028 host/IPaddress they were delivered to, and cut out RSET when sending another
3029 message down the same channel. Write the completed addresses to the journal
3030 now so that they are recorded in case there is a crash of hardware or
3031 software before the spool gets updated. Also record the final SMTP
3032 confirmation if needed (for SMTP only). */
3033
3034 if (sx.ok)
3035 {
3036 int flag = '=';
3037 int delivery_time = (int)(time(NULL) - start_delivery_time);
3038 int len;
3039 uschar *conf = NULL;
3040
3041 sx.send_rset = FALSE;
3042 pipelining_active = FALSE;
3043
3044 /* Set up confirmation if needed - applies only to SMTP */
3045
3046 if (
3047 #ifdef DISABLE_EVENT
3048 LOGGING(smtp_confirmation) &&
3049 #endif
3050 !sx.lmtp
3051 )
3052 {
3053 const uschar *s = string_printing(sx.buffer);
3054 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3055 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3056 }
3057
3058 /* Process all transported addresses - for LMTP or PRDR, read a status for
3059 each one. */
3060
3061 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3062 {
3063 if (addr->transport_return != PENDING_OK) continue;
3064
3065 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3066 remaining addresses. Otherwise, it's a return code for just the one
3067 address. For temporary errors, add a retry item for the address so that
3068 it doesn't get tried again too soon. */
3069
3070 #ifndef DISABLE_PRDR
3071 if (sx.lmtp || sx.prdr_active)
3072 #else
3073 if (sx.lmtp)
3074 #endif
3075 {
3076 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3077 sx.ob->final_timeout))
3078 {
3079 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3080 addr->message = string_sprintf(
3081 #ifndef DISABLE_PRDR
3082 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3083 #else
3084 "LMTP error after %s: %s",
3085 #endif
3086 data_command, string_printing(sx.buffer));
3087 setflag(addr, af_pass_message); /* Allow message to go to user */
3088 if (sx.buffer[0] == '5')
3089 addr->transport_return = FAIL;
3090 else
3091 {
3092 errno = ERRNO_DATA4XX;
3093 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3094 addr->transport_return = DEFER;
3095 #ifndef DISABLE_PRDR
3096 if (!sx.prdr_active)
3097 #endif
3098 retry_add_item(addr, addr->address_retry_key, 0);
3099 }
3100 continue;
3101 }
3102 sx.completed_addr = TRUE; /* NOW we can set this flag */
3103 if (LOGGING(smtp_confirmation))
3104 {
3105 const uschar *s = string_printing(sx.buffer);
3106 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3107 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3108 }
3109 }
3110
3111 /* SMTP, or success return from LMTP for this address. Pass back the
3112 actual host that was used. */
3113
3114 addr->transport_return = OK;
3115 addr->more_errno = delivery_time;
3116 addr->host_used = host;
3117 addr->special_action = flag;
3118 addr->message = conf;
3119 #ifndef DISABLE_PRDR
3120 if (sx.prdr_active) addr->flags |= af_prdr_used;
3121 #endif
3122 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3123 flag = '-';
3124
3125 #ifndef DISABLE_PRDR
3126 if (!sx.prdr_active)
3127 #endif
3128 {
3129 /* Update the journal. For homonymic addresses, use the base address plus
3130 the transport name. See lots of comments in deliver.c about the reasons
3131 for the complications when homonyms are involved. Just carry on after
3132 write error, as it may prove possible to update the spool file later. */
3133
3134 if (testflag(addr, af_homonym))
3135 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3136 else
3137 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3138
3139 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3140 len = Ustrlen(CS sx.buffer);
3141 if (write(journal_fd, sx.buffer, len) != len)
3142 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3143 "%s: %s", sx.buffer, strerror(errno));
3144 }
3145 }
3146
3147 #ifndef DISABLE_PRDR
3148 if (sx.prdr_active)
3149 {
3150 /* PRDR - get the final, overall response. For any non-success
3151 upgrade all the address statuses. */
3152 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3153 sx.ob->final_timeout);
3154 if (!sx.ok)
3155 {
3156 if(errno == 0 && sx.buffer[0] == '4')
3157 {
3158 errno = ERRNO_DATA4XX;
3159 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3160 }
3161 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3162 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3163 addr->transport_return = PENDING_OK; /* allow set_errno action */
3164 goto RESPONSE_FAILED;
3165 }
3166
3167 /* Update the journal, or setup retry. */
3168 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3169 if (addr->transport_return == OK)
3170 {
3171 if (testflag(addr, af_homonym))
3172 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3173 else
3174 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3175
3176 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3177 len = Ustrlen(CS sx.buffer);
3178 if (write(journal_fd, sx.buffer, len) != len)
3179 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3180 "%s: %s", sx.buffer, strerror(errno));
3181 }
3182 else if (addr->transport_return == DEFER)
3183 retry_add_item(addr, addr->address_retry_key, -2);
3184 }
3185 #endif
3186
3187 /* Ensure the journal file is pushed out to disk. */
3188
3189 if (EXIMfsync(journal_fd) < 0)
3190 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3191 strerror(errno));
3192 }
3193 }
3194
3195
3196 /* Handle general (not specific to one address) failures here. The value of ok
3197 is used to skip over this code on the falling through case. A timeout causes a
3198 deferral. Other errors may defer or fail according to the response code, and
3199 may set up a special errno value, e.g. after connection chopped, which is
3200 assumed if errno == 0 and there is no text in the buffer. If control reaches
3201 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3202 the problem is not related to this specific message. */
3203
3204 if (!sx.ok)
3205 {
3206 int code, set_rc;
3207 uschar * set_message;
3208
3209 RESPONSE_FAILED:
3210 {
3211 save_errno = errno;
3212 message = NULL;
3213 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3214 sx.buffer, &code, &message, &pass_message);
3215 goto FAILED;
3216 }
3217
3218 SEND_FAILED:
3219 {
3220 save_errno = errno;
3221 code = '4';
3222 message = string_sprintf("send() to %s [%s] failed: %s",
3223 host->name, host->address, message ? message : US strerror(save_errno));
3224 sx.send_quit = FALSE;
3225 goto FAILED;
3226 }
3227
3228 FAILED:
3229 {
3230 BOOL message_error;
3231
3232 sx.ok = FALSE; /* For when reached by GOTO */
3233 set_message = message;
3234
3235 /* We want to handle timeouts after MAIL or "." and loss of connection after
3236 "." specially. They can indicate a problem with the sender address or with
3237 the contents of the message rather than a real error on the connection. These
3238 cases are treated in the same way as a 4xx response. This next bit of code
3239 does the classification. */
3240
3241 switch(save_errno)
3242 {
3243 case 0:
3244 case ERRNO_MAIL4XX:
3245 case ERRNO_DATA4XX:
3246 message_error = TRUE;
3247 break;
3248
3249 case ETIMEDOUT:
3250 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3251 Ustrncmp(smtp_command,"end ",4) == 0;
3252 break;
3253
3254 case ERRNO_SMTPCLOSED:
3255 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3256 break;
3257
3258 default:
3259 message_error = FALSE;
3260 break;
3261 }
3262
3263 /* Handle the cases that are treated as message errors. These are:
3264
3265 (a) negative response or timeout after MAIL
3266 (b) negative response after DATA
3267 (c) negative response or timeout or dropped connection after "."
3268 (d) utf8 support required and not offered
3269
3270 It won't be a negative response or timeout after RCPT, as that is dealt
3271 with separately above. The action in all cases is to set an appropriate
3272 error code for all the addresses, but to leave yield set to OK because the
3273 host itself has not failed. Of course, it might in practice have failed
3274 when we've had a timeout, but if so, we'll discover that at the next
3275 delivery attempt. For a temporary error, set the message_defer flag, and
3276 write to the logs for information if this is not the last host. The error
3277 for the last host will be logged as part of the address's log line. */
3278
3279 if (message_error)
3280 {
3281 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3282
3283 /* If there's an errno, the message contains just the identity of
3284 the host. */
3285
3286 if (code == '5')
3287 set_rc = FAIL;
3288 else /* Anything other than 5 is treated as temporary */
3289 {
3290 set_rc = DEFER;
3291 if (save_errno > 0)
3292 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3293 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3294 msglog_line(host, message);
3295 *message_defer = TRUE;
3296 }
3297 }
3298
3299 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3300 ".", or some other transportation error. We defer all addresses and yield
3301 DEFER, except for the case of failed add_headers expansion, or a transport
3302 filter failure, when the yield should be ERROR, to stop it trying other
3303 hosts. */
3304
3305 else
3306 {
3307 set_rc = DEFER;
3308 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3309 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3310 }
3311 }
3312
3313 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3314 #ifdef EXPERIMENTAL_DSN_INFO
3315 , sx.smtp_greeting, sx.helo_response
3316 #endif
3317 );
3318 }
3319
3320
3321 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3322 SMTP session tidily. However, if there were too many addresses to send in one
3323 message (indicated by first_addr being non-NULL) we want to carry on with the
3324 rest of them. Also, it is desirable to send more than one message down the SMTP
3325 connection if there are several waiting, provided we haven't already sent so
3326 many as to hit the configured limit. The function transport_check_waiting looks
3327 for a waiting message and returns its id. Then transport_pass_socket tries to
3328 set up a continued delivery by passing the socket on to another process. The
3329 variable send_rset is FALSE if a message has just been successfully transfered.
3330
3331 If we are already sending down a continued channel, there may be further
3332 addresses not yet delivered that are aimed at the same host, but which have not
3333 been passed in this run of the transport. In this case, continue_more will be
3334 true, and all we should do is send RSET if necessary, and return, leaving the
3335 channel open.
3336
3337 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3338 do not want to continue with other messages down the same channel, because that
3339 can lead to looping between two or more messages, all with the same,
3340 temporarily failing address(es). [The retry information isn't updated yet, so
3341 new processes keep on trying.] We probably also don't want to try more of this
3342 message's addresses either.
3343
3344 If we have started a TLS session, we have to end it before passing the
3345 connection to a new process. However, not all servers can handle this (Exim
3346 can), so we do not pass such a connection on if the host matches
3347 hosts_nopass_tls. */
3348
3349 DEBUG(D_transport)
3350 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3351 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3352 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3353
3354 if (sx.completed_addr && sx.ok && sx.send_quit)
3355 {
3356 BOOL more;
3357 smtp_compare_t t_compare;
3358
3359 t_compare.tblock = tblock;
3360 t_compare.current_sender_address = sender_address;
3361
3362 if ( sx.first_addr != NULL
3363 || continue_more
3364 || (
3365 #ifdef SUPPORT_TLS
3366 ( tls_out.active < 0 && !continue_proxy_cipher
3367 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3368 )
3369 &&
3370 #endif
3371 transport_check_waiting(tblock->name, host->name,
3372 tblock->connection_max_messages, new_message_id, &more,
3373 (oicf)smtp_are_same_identities, (void*)&t_compare)
3374 ) )
3375 {
3376 uschar *msg;
3377 BOOL pass_message;
3378
3379 if (sx.send_rset)
3380 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3381 {
3382 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3383 host->address, strerror(errno));
3384 sx.send_quit = FALSE;
3385 }
3386 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3387 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3388 {
3389 int code;
3390 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3391 &pass_message);
3392 if (!sx.send_quit)
3393 {
3394 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3395 host->name, host->address, msg);
3396 }
3397 }
3398
3399 /* Either RSET was not needed, or it succeeded */
3400
3401 if (sx.ok)
3402 {
3403 int pfd[2];
3404 int socket_fd = sx.inblock.sock;
3405
3406
3407 if (sx.first_addr != NULL) /* More addresses still to be sent */
3408 { /* in this run of the transport */
3409 continue_sequence++; /* Causes * in logging */
3410 goto SEND_MESSAGE;
3411 }
3412
3413 /* Unless caller said it already has more messages listed for this host,
3414 pass the connection on to a new Exim process (below, the call to
3415 transport_pass_socket). If the caller has more ready, just return with
3416 the connection still open. */
3417
3418 #ifdef SUPPORT_TLS
3419 if (tls_out.active >= 0)
3420 if ( continue_more
3421 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3422 {
3423 /* Before passing the socket on, or returning to caller with it still
3424 open, we must shut down TLS. Not all MTAs allow for the continuation
3425 of the SMTP session when TLS is shut down. We test for this by sending
3426 a new EHLO. If we don't get a good response, we don't attempt to pass
3427 the socket on. */
3428
3429 tls_close(FALSE, TRUE);
3430 smtp_peer_options = smtp_peer_options_wrap;
3431 sx.ok = !sx.smtps
3432 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3433 "EHLO %s\r\n", sx.helo_data) >= 0
3434 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3435 '2', sx.ob->command_timeout);
3436
3437 if (sx.ok && continue_more)
3438 return yield; /* More addresses for another run */
3439 }
3440 else
3441 {
3442 /* Set up a pipe for proxying TLS for the new transport process */
3443
3444 smtp_peer_options |= PEER_OFFERED_TLS;
3445 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3446 socket_fd = pfd[1];
3447 else
3448 set_errno(sx.first_addr, errno, US"internal allocation problem",
3449 DEFER, FALSE, host
3450 # ifdef EXPERIMENTAL_DSN_INFO
3451 , sx.smtp_greeting, sx.helo_response
3452 # endif
3453 );
3454 }
3455 else
3456 #endif
3457 if (continue_more)
3458 return yield; /* More addresses for another run */
3459
3460 /* If the socket is successfully passed, we mustn't send QUIT (or
3461 indeed anything!) from here. */
3462
3463 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3464 propagate it from the initial
3465 */
3466 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3467 host->address, new_message_id, socket_fd))
3468 {
3469 sx.send_quit = FALSE;
3470
3471 /* If TLS is still active, we need to proxy it for the transport we
3472 just passed the baton to. Fork a child to to do it, and return to
3473 get logging done asap. Which way to place the work makes assumptions
3474 about post-fork prioritisation which may not hold on all platforms. */
3475 #ifdef SUPPORT_TLS
3476 if (tls_out.active >= 0)
3477 {
3478 int pid = fork();
3479 if (pid > 0) /* parent */
3480 {
3481 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3482 close(pfd[0]);
3483 waitpid(pid, NULL, 0);
3484 tls_close(FALSE, FALSE);
3485 (void)close(sx.inblock.sock);
3486 continue_transport = NULL;
3487 continue_hostname = NULL;
3488 return yield;
3489 }
3490 else if (pid == 0) /* child; fork again to disconnect totally */
3491 {
3492 close(pfd[1]);
3493 if ((pid = fork()))
3494 {
3495 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3496 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3497 }
3498 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3499 exim_exit(0);
3500 }
3501 }
3502 #endif
3503 }
3504 }
3505
3506 /* If RSET failed and there are addresses left, they get deferred. */
3507 else
3508 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3509 #ifdef EXPERIMENTAL_DSN_INFO
3510 , sx.smtp_greeting, sx.helo_response
3511 #endif
3512 );
3513 }
3514 }
3515
3516 /* End off tidily with QUIT unless the connection has died or the socket has
3517 been passed to another process. There has been discussion on the net about what
3518 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3519 to wait for a response, but on the other hand, there isn't anything one can do
3520 with an error response, other than log it. Exim used to do that. However,
3521 further discussion suggested that it is positively advantageous not to wait for
3522 the response, but to close the session immediately. This is supposed to move
3523 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3524 load from the server. (Hosts that are both servers and clients may not see much
3525 difference, of course.) Further discussion indicated that this was safe to do
3526 on Unix systems which have decent implementations of TCP/IP that leave the
3527 connection around for a while (TIME_WAIT) after the application has gone away.
3528 This enables the response sent by the server to be properly ACKed rather than
3529 timed out, as can happen on broken TCP/IP implementations on other OS.
3530
3531 This change is being made on 31-Jul-98. After over a year of trouble-free
3532 operation, the old commented-out code was removed on 17-Sep-99. */
3533
3534 SEND_QUIT:
3535 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3536
3537 END_OFF:
3538
3539 #ifdef SUPPORT_TLS
3540 tls_close(FALSE, TRUE);
3541 #endif
3542
3543 /* Close the socket, and return the appropriate value, first setting
3544 works because the NULL setting is passed back to the calling process, and
3545 remote_max_parallel is forced to 1 when delivering over an existing connection,
3546
3547 If all went well and continue_more is set, we shouldn't actually get here if
3548 there are further addresses, as the return above will be taken. However,
3549 writing RSET might have failed, or there may be other addresses whose hosts are
3550 specified in the transports, and therefore not visible at top level, in which
3551 case continue_more won't get set. */
3552
3553 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3554 if (sx.send_quit)
3555 {
3556 shutdown(sx.outblock.sock, SHUT_WR);
3557 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3558 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3559 rc--; /* drain socket */
3560 }
3561 (void)close(sx.inblock.sock);
3562
3563 #ifndef DISABLE_EVENT
3564 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3565 #endif
3566
3567 continue_transport = NULL;
3568 continue_hostname = NULL;
3569 return yield;
3570 }
3571
3572
3573
3574
3575 /*************************************************
3576 * Closedown entry point *
3577 *************************************************/
3578
3579 /* This function is called when exim is passed an open smtp channel
3580 from another incarnation, but the message which it has been asked
3581 to deliver no longer exists. The channel is on stdin.
3582
3583 We might do fancy things like looking for another message to send down
3584 the channel, but if the one we sought has gone, it has probably been
3585 delivered by some other process that itself will seek further messages,
3586 so just close down our connection.
3587
3588 Argument: pointer to the transport instance block
3589 Returns: nothing
3590 */
3591
3592 void
3593 smtp_transport_closedown(transport_instance *tblock)
3594 {
3595 smtp_transport_options_block *ob =
3596 (smtp_transport_options_block *)tblock->options_block;
3597 smtp_inblock inblock;
3598 smtp_outblock outblock;
3599 uschar buffer[256];
3600 uschar inbuffer[4096];
3601 uschar outbuffer[16];
3602
3603 inblock.sock = fileno(stdin);
3604 inblock.buffer = inbuffer;
3605 inblock.buffersize = sizeof(inbuffer);
3606 inblock.ptr = inbuffer;
3607 inblock.ptrend = inbuffer;
3608
3609 outblock.sock = inblock.sock;
3610 outblock.buffersize = sizeof(outbuffer);
3611 outblock.buffer = outbuffer;
3612 outblock.ptr = outbuffer;
3613 outblock.cmd_count = 0;
3614 outblock.authenticating = FALSE;
3615
3616 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3617 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3618 ob->command_timeout);
3619 (void)close(inblock.sock);
3620 }
3621
3622
3623
3624 /*************************************************
3625 * Prepare addresses for delivery *
3626 *************************************************/
3627
3628 /* This function is called to flush out error settings from previous delivery
3629 attempts to other hosts. It also records whether we got here via an MX record
3630 or not in the more_errno field of the address. We are interested only in
3631 addresses that are still marked DEFER - others may have got delivered to a
3632 previously considered IP address. Set their status to PENDING_DEFER to indicate
3633 which ones are relevant this time.
3634
3635 Arguments:
3636 addrlist the list of addresses
3637 host the host we are delivering to
3638
3639 Returns: the first address for this delivery
3640 */
3641
3642 static address_item *
3643 prepare_addresses(address_item *addrlist, host_item *host)
3644 {
3645 address_item *first_addr = NULL;
3646 address_item *addr;
3647 for (addr = addrlist; addr; addr = addr->next)
3648 if (addr->transport_return == DEFER)
3649 {
3650 if (!first_addr) first_addr = addr;
3651 addr->transport_return = PENDING_DEFER;
3652 addr->basic_errno = 0;
3653 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3654 addr->message = NULL;
3655 #ifdef SUPPORT_TLS
3656 addr->cipher = NULL;
3657 addr->ourcert = NULL;
3658 addr->peercert = NULL;
3659 addr->peerdn = NULL;
3660 addr->ocsp = OCSP_NOT_REQ;
3661 #endif
3662 #ifdef EXPERIMENTAL_DSN_INFO
3663 addr->smtp_greeting = NULL;
3664 addr->helo_response = NULL;
3665 #endif
3666 }
3667 return first_addr;
3668 }
3669
3670
3671
3672 /*************************************************
3673 * Main entry point *
3674 *************************************************/
3675
3676 /* See local README for interface details. As this is a remote transport, it is
3677 given a chain of addresses to be delivered in one connection, if possible. It
3678 always returns TRUE, indicating that each address has its own independent
3679 status set, except if there is a setting up problem, in which case it returns
3680 FALSE. */
3681
3682 BOOL
3683 smtp_transport_entry(
3684 transport_instance *tblock, /* data for this instantiation */
3685 address_item *addrlist) /* addresses we are working on */
3686 {
3687 int cutoff_retry;
3688 int defport;
3689 int hosts_defer = 0;
3690 int hosts_fail = 0;
3691 int hosts_looked_up = 0;
3692 int hosts_retry = 0;
3693 int hosts_serial = 0;
3694 int hosts_total = 0;
3695 int total_hosts_tried = 0;
3696 address_item *addr;
3697 BOOL expired = TRUE;
3698 uschar *expanded_hosts = NULL;
3699 uschar *pistring;
3700 uschar *tid = string_sprintf("%s transport", tblock->name);
3701 smtp_transport_options_block *ob =
3702 (smtp_transport_options_block *)(tblock->options_block);
3703 host_item *hostlist = addrlist->host_list;
3704 host_item *host = NULL;
3705
3706 DEBUG(D_transport)
3707 {
3708 debug_printf("%s transport entered\n", tblock->name);
3709 for (addr = addrlist; addr; addr = addr->next)
3710 debug_printf(" %s\n", addr->address);
3711 if (hostlist)
3712 {
3713 debug_printf("hostlist:\n");
3714 for (host = hostlist; host; host = host->next)
3715 debug_printf(" %s:%d\n", host->name, host->port);
3716 }
3717 if (continue_hostname)
3718 debug_printf("already connected to %s [%s] (on fd %d)\n",
3719 continue_hostname, continue_host_address,
3720 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3721 }
3722
3723 /* Set the flag requesting that these hosts be added to the waiting
3724 database if the delivery fails temporarily or if we are running with
3725 queue_smtp or a 2-stage queue run. This gets unset for certain
3726 kinds of error, typically those that are specific to the message. */
3727
3728 update_waiting = TRUE;
3729
3730 /* If a host list is not defined for the addresses - they must all have the
3731 same one in order to be passed to a single transport - or if the transport has
3732 a host list with hosts_override set, use the host list supplied with the
3733 transport. It is an error for this not to exist. */
3734
3735 if (!hostlist || (ob->hosts_override && ob->hosts))
3736 {
3737 if (!ob->hosts)
3738 {
3739 addrlist->message = string_sprintf("%s transport called with no hosts set",
3740 tblock->name);
3741 addrlist->transport_return = PANIC;
3742 return FALSE; /* Only top address has status */
3743 }
3744
3745 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3746 ob->hosts);
3747
3748 /* If the transport's host list contains no '$' characters, and we are not
3749 randomizing, it is fixed and therefore a chain of hosts can be built once
3750 and for all, and remembered for subsequent use by other calls to this
3751 transport. If, on the other hand, the host list does contain '$', or we are
3752 randomizing its order, we have to rebuild it each time. In the fixed case,
3753 as the hosts string will never be used again, it doesn't matter that we
3754 replace all the : characters with zeros. */
3755
3756 if (!ob->hostlist)
3757 {
3758 uschar *s = ob->hosts;
3759
3760 if (Ustrchr(s, '$') != NULL)
3761 {
3762 if (!(expanded_hosts = expand_string(s)))
3763 {
3764 addrlist->message = string_sprintf("failed to expand list of hosts "
3765 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3766 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3767 return FALSE; /* Only top address has status */
3768 }
3769 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3770 "\"%s\"\n", s, expanded_hosts);
3771 s = expanded_hosts;
3772 }
3773 else
3774 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3775
3776 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3777
3778 /* Check that the expansion yielded something useful. */
3779 if (!hostlist)
3780 {
3781 addrlist->message =
3782 string_sprintf("%s transport has empty hosts setting", tblock->name);
3783 addrlist->transport_return = PANIC;
3784 return FALSE; /* Only top address has status */
3785 }
3786
3787 /* If there was no expansion of hosts, save the host list for
3788 next time. */
3789
3790 if (!expanded_hosts) ob->hostlist = hostlist;
3791 }
3792
3793 /* This is not the first time this transport has been run in this delivery;
3794 the host list was built previously. */
3795
3796 else
3797 hostlist = ob->hostlist;
3798 }
3799
3800 /* The host list was supplied with the address. If hosts_randomize is set, we
3801 must sort it into a random order if it did not come from MX records and has not
3802 already been randomized (but don't bother if continuing down an existing
3803 connection). */
3804
3805 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3806 {
3807 host_item *newlist = NULL;
3808 while (hostlist)
3809 {
3810 host_item *h = hostlist;
3811 hostlist = hostlist->next;
3812
3813 h->sort_key = random_number(100);
3814
3815 if (!newlist)
3816 {
3817 h->next = NULL;
3818 newlist = h;
3819 }
3820 else if (h->sort_key < newlist->sort_key)
3821 {
3822 h->next = newlist;
3823 newlist = h;
3824 }
3825 else
3826 {
3827 host_item *hh = newlist;
3828 while (hh->next)
3829 {
3830 if (h->sort_key < hh->next->sort_key) break;
3831 hh = hh->next;
3832 }
3833 h->next = hh->next;
3834 hh->next = h;
3835 }
3836 }
3837
3838 hostlist = addrlist->host_list = newlist;
3839 }
3840
3841 /* Sort out the default port. */
3842
3843 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3844
3845 /* For each host-plus-IP-address on the list:
3846
3847 . If this is a continued delivery and the host isn't the one with the
3848 current connection, skip.
3849
3850 . If the status is unusable (i.e. previously failed or retry checked), skip.
3851
3852 . If no IP address set, get the address, either by turning the name into
3853 an address, calling gethostbyname if gethostbyname is on, or by calling
3854 the DNS. The DNS may yield multiple addresses, in which case insert the
3855 extra ones into the list.
3856
3857 . Get the retry data if not previously obtained for this address and set the
3858 field which remembers the state of this address. Skip if the retry time is
3859 not reached. If not, remember whether retry data was found. The retry string
3860 contains both the name and the IP address.
3861
3862 . Scan the list of addresses and mark those whose status is DEFER as
3863 PENDING_DEFER. These are the only ones that will be processed in this cycle
3864 of the hosts loop.
3865
3866 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3867 Some addresses may be successfully delivered, others may fail, and yet
3868 others may get temporary errors and so get marked DEFER.
3869
3870 . The return from the delivery attempt is OK if a connection was made and a
3871 valid SMTP dialogue was completed. Otherwise it is DEFER.
3872
3873 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3874
3875 . If fail to connect, or other defer state, add a retry item.
3876
3877 . If there are any addresses whose status is still DEFER, carry on to the
3878 next host/IPaddress, unless we have tried the number of hosts given
3879 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3880 there is some fancy logic for hosts_max_try that means its limit can be
3881 overstepped in some circumstances.
3882
3883 If we get to the end of the list, all hosts have deferred at least one address,
3884 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3885 delivery attempt to those hosts whose last try was before the arrival time of
3886 the current message. To cope with this, we have to go round the loop a second
3887 time. After that, set the status and error data for any addresses that haven't
3888 had it set already. */
3889
3890 for (cutoff_retry = 0;
3891 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3892 cutoff_retry++)
3893 {
3894 host_item *nexthost = NULL;
3895 int unexpired_hosts_tried = 0;
3896
3897 for (host = hostlist;
3898 host
3899 && unexpired_hosts_tried < ob->hosts_max_try
3900 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3901 host = nexthost)
3902 {
3903 int rc;
3904 int host_af;
3905 uschar *rs;
3906 BOOL host_is_expired = FALSE;
3907 BOOL message_defer = FALSE;
3908 BOOL some_deferred = FALSE;
3909 address_item *first_addr = NULL;
3910 uschar *interface = NULL;
3911 uschar *retry_host_key = NULL;
3912 uschar *retry_message_key = NULL;
3913 uschar *serialize_key = NULL;
3914
3915 /* Default next host is next host. :-) But this can vary if the
3916 hosts_max_try limit is hit (see below). It may also be reset if a host
3917 address is looked up here (in case the host was multihomed). */
3918
3919 nexthost = host->next;
3920
3921 /* If the address hasn't yet been obtained from the host name, look it up
3922 now, unless the host is already marked as unusable. If it is marked as
3923 unusable, it means that the router was unable to find its IP address (in
3924 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3925 the lookup failed last time. We don't get this far if *all* MX records
3926 point to non-existent hosts; that is treated as a hard error.
3927
3928 We can just skip this host entirely. When the hosts came from the router,
3929 the address will timeout based on the other host(s); when the address is
3930 looked up below, there is an explicit retry record added.
3931
3932 Note that we mustn't skip unusable hosts if the address is not unset; they
3933 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3934
3935 if (!host->address)
3936 {
3937 int new_port, flags;
3938 host_item *hh;
3939
3940 if (host->status >= hstatus_unusable)
3941 {
3942 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3943 host->name);
3944 continue;
3945 }
3946
3947 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3948
3949 /* The host name is permitted to have an attached port. Find it, and
3950 strip it from the name. Just remember it for now. */
3951
3952 new_port = host_item_get_port(host);
3953
3954 /* Count hosts looked up */
3955
3956 hosts_looked_up++;
3957
3958 /* Find by name if so configured, or if it's an IP address. We don't
3959 just copy the IP address, because we need the test-for-local to happen. */
3960
3961 flags = HOST_FIND_BY_A;
3962 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3963 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3964
3965 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3966 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3967 else
3968 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3969 &ob->dnssec, /* domains for request/require */
3970 NULL, NULL);
3971
3972 /* Update the host (and any additional blocks, resulting from
3973 multihoming) with a host-specific port, if any. */
3974
3975 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3976
3977 /* Failure to find the host at this time (usually DNS temporary failure)
3978 is really a kind of routing failure rather than a transport failure.
3979 Therefore we add a retry item of the routing kind, not to stop us trying
3980 to look this name up here again, but to ensure the address gets timed
3981 out if the failures go on long enough. A complete failure at this point
3982 commonly points to a configuration error, but the best action is still
3983 to carry on for the next host. */
3984
3985 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3986 {
3987 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3988 expired = FALSE;
3989 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3990 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3991 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3992 host->status = hstatus_unusable;
3993
3994 for (addr = addrlist; addr; addr = addr->next)
3995 {
3996 if (addr->transport_return != DEFER) continue;
3997 addr->basic_errno = ERRNO_UNKNOWNHOST;
3998 addr->message = string_sprintf(
3999 rc == HOST_FIND_SECURITY
4000 ? "lookup of IP address for %s was insecure"
4001 : "failed to lookup IP address for %s",
4002 host->name);
4003 }
4004 continue;
4005 }
4006
4007 /* If the host is actually the local host, we may have a problem, or
4008 there may be some cunning configuration going on. In the problem case,
4009 log things and give up. The default transport status is already DEFER. */
4010
4011 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4012 {
4013 for (addr = addrlist; addr; addr = addr->next)
4014 {
4015 addr->basic_errno = 0;
4016 addr->message = string_sprintf("%s transport found host %s to be "
4017 "local", tblock->name, host->name);
4018 }
4019 goto END_TRANSPORT;
4020 }
4021 } /* End of block for IP address lookup */
4022
4023 /* If this is a continued delivery, we are interested only in the host
4024 which matches the name of the existing open channel. The check is put
4025 here after the local host lookup, in case the name gets expanded as a
4026 result of the lookup. Set expired FALSE, to save the outer loop executing
4027 twice. */
4028
4029 if ( continue_hostname
4030 && ( Ustrcmp(continue_hostname, host->name) != 0
4031 || Ustrcmp(continue_host_address, host->address) != 0
4032 ) )
4033 {
4034 expired = FALSE;
4035 continue; /* With next host */
4036 }
4037
4038 /* Reset the default next host in case a multihomed host whose addresses
4039 are not looked up till just above added to the host list. */
4040
4041 nexthost = host->next;
4042
4043 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4044 domain is in queue_smtp_domains, we don't actually want to attempt any
4045 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4046 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4047 were not in it. We don't want to hold up all SMTP deliveries! Except when
4048 doing a two-stage queue run, don't do this if forcing. */
4049
4050 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4051 match_isinlist(addrlist->domain,
4052 (const uschar **)&queue_smtp_domains, 0,
4053 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4054 {
4055 expired = FALSE;
4056 for (addr = addrlist; addr; addr = addr->next)
4057 if (addr->transport_return == DEFER)
4058 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4059 continue; /* With next host */
4060 }
4061
4062 /* Count hosts being considered - purely for an intelligent comment
4063 if none are usable. */
4064
4065 hosts_total++;
4066
4067 /* Set $host and $host address now in case they are needed for the
4068 interface expansion or the serialize_hosts check; they remain set if an
4069 actual delivery happens. */
4070
4071 deliver_host = host->name;
4072 deliver_host_address = host->address;
4073 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4074 : host->dnssec == DS_NO ? US"no"
4075 : US"";
4076
4077 /* Set up a string for adding to the retry key if the port number is not
4078 the standard SMTP port. A host may have its own port setting that overrides
4079 the default. */
4080
4081 pistring = string_sprintf(":%d", host->port == PORT_NONE
4082 ? defport : host->port);
4083 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4084
4085 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4086 string is set, even if constant (as different transports can have different
4087 constant settings), we must add it to the key that is used for retries,
4088 because connections to the same host from a different interface should be
4089 treated separately. */
4090
4091 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4092 if ((rs = ob->interface) && *rs)
4093 {
4094 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4095 return FALSE;
4096 pistring = string_sprintf("%s/%s", pistring, interface);
4097 }
4098
4099 /* The first time round the outer loop, check the status of the host by
4100 inspecting the retry data. The second time round, we are interested only
4101 in expired hosts that haven't been tried since this message arrived. */
4102
4103 if (cutoff_retry == 0)
4104 {
4105 BOOL incl_ip;
4106 /* Ensure the status of the address is set by checking retry data if
4107 necessary. There may be host-specific retry data (applicable to all
4108 messages) and also data for retries of a specific message at this host.
4109 If either of these retry records are actually read, the keys used are
4110 returned to save recomputing them later. */
4111
4112 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4113 US"retry_include_ip_address", ob->retry_include_ip_address,
4114 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4115 continue; /* with next host */
4116
4117 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4118 incl_ip, &retry_host_key, &retry_message_key);
4119
4120 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4121 (host->address == NULL)? US"" : host->address, pistring,
4122 (host->status == hstatus_usable)? "usable" :
4123 (host->status == hstatus_unusable)? "unusable" :
4124 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4125
4126 /* Skip this address if not usable at this time, noting if it wasn't
4127 actually expired, both locally and in the address. */
4128
4129 switch (host->status)
4130 {
4131 case hstatus_unusable:
4132 expired = FALSE;
4133 setflag(addrlist, af_retry_skipped);
4134 /* Fall through */
4135
4136 case hstatus_unusable_expired:
4137 switch (host->why)
4138 {
4139 case hwhy_retry: hosts_retry++; break;
4140 case hwhy_failed: hosts_fail++; break;
4141 case hwhy_insecure:
4142 case hwhy_deferred: hosts_defer++; break;
4143 }
4144
4145 /* If there was a retry message key, implying that previously there
4146 was a message-specific defer, we don't want to update the list of
4147 messages waiting for these hosts. */
4148
4149 if (retry_message_key) update_waiting = FALSE;
4150 continue; /* With the next host or IP address */
4151 }
4152 }
4153
4154 /* Second time round the loop: if the address is set but expired, and
4155 the message is newer than the last try, let it through. */
4156
4157 else
4158 {
4159 if ( !host->address
4160 || host->status != hstatus_unusable_expired
4161 || host->last_try > received_time)
4162 continue;
4163 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4164 host->name, host->address, pistring);
4165 host_is_expired = TRUE;
4166 }
4167
4168 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4169 it remains TRUE only if all hosts are expired and none are actually tried.
4170 */
4171
4172 expired = FALSE;
4173
4174 /* If this host is listed as one to which access must be serialized,
4175 see if another Exim process has a connection to it, and if so, skip
4176 this host. If not, update the database to record our connection to it
4177 and remember this for later deletion. Do not do any of this if we are
4178 sending the message down a pre-existing connection. */
4179
4180 if ( !continue_hostname
4181 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4182 {
4183 serialize_key = string_sprintf("host-serialize-%s", host->name);
4184 if (!enq_start(serialize_key, 1))
4185 {
4186 DEBUG(D_transport)
4187 debug_printf("skipping host %s because another Exim process "
4188 "is connected to it\n", host->name);
4189 hosts_serial++;
4190 continue;
4191 }
4192 }
4193
4194 /* OK, we have an IP address that is not waiting for its retry time to
4195 arrive (it might be expired) OR (second time round the loop) we have an
4196 expired host that hasn't been tried since the message arrived. Have a go
4197 at delivering the message to it. First prepare the addresses by flushing
4198 out the result of previous attempts, and finding the first address that
4199 is still to be delivered. */
4200
4201 first_addr = prepare_addresses(addrlist, host);
4202
4203 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4204 message_id, host->name, host->address, addrlist->address,
4205 addrlist->next ? ", ..." : "");
4206
4207 set_process_info("delivering %s to %s [%s] (%s%s)",
4208 message_id, host->name, host->address, addrlist->address,
4209 addrlist->next ? ", ..." : "");
4210
4211 /* This is not for real; don't do the delivery. If there are
4212 any remaining hosts, list them. */
4213
4214 if (dont_deliver)
4215 {
4216 host_item *host2;
4217 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4218 for (addr = addrlist; addr; addr = addr->next)
4219 {
4220 addr->host_used = host;
4221 addr->special_action = '*';
4222 addr->message = US"delivery bypassed by -N option";
4223 }
4224 DEBUG(D_transport)
4225 {
4226 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4227 "*** host and remaining hosts:\n", tblock->name);
4228 for (host2 = host; host2; host2 = host2->next)
4229 debug_printf(" %s [%s]\n", host2->name,
4230 host2->address ? host2->address : US"unset");
4231 }
4232 rc = OK;
4233 }
4234
4235 /* This is for real. If the host is expired, we don't count it for
4236 hosts_max_retry. This ensures that all hosts must expire before an address
4237 is timed out, unless hosts_max_try_hardlimit (which protects against
4238 lunatic DNS configurations) is reached.
4239
4240 If the host is not expired and we are about to hit the hosts_max_retry
4241 limit, check to see if there is a subsequent hosts with a different MX
4242 value. If so, make that the next host, and don't count this one. This is a
4243 heuristic to make sure that different MXs do get tried. With a normal kind
4244 of retry rule, they would get tried anyway when the earlier hosts were
4245 delayed, but if the domain has a "retry every time" type of rule - as is
4246 often used for the the very large ISPs, that won't happen. */
4247
4248 else
4249 {
4250 host_item * thost;
4251 /* Make a copy of the host if it is local to this invocation
4252 of the transport. */
4253
4254 if (expanded_hosts)
4255 {
4256 thost = store_get(sizeof(host_item));
4257 *thost = *host;
4258 thost->name = string_copy(host->name);
4259 thost->address = string_copy(host->address);
4260 }
4261 else
4262 thost = host;
4263
4264 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4265 {
4266 host_item *h;
4267 DEBUG(D_transport)
4268 debug_printf("hosts_max_try limit reached with this host\n");
4269 for (h = host; h; h = h->next) if (h->mx != host->mx)
4270 {
4271 nexthost = h;
4272 unexpired_hosts_tried--;
4273 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4274 "and will be tried\n");
4275 break;
4276 }
4277 }
4278
4279 /* Attempt the delivery. */
4280
4281 total_hosts_tried++;
4282 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4283 &message_defer, FALSE);
4284
4285 /* Yield is one of:
4286 OK => connection made, each address contains its result;
4287 message_defer is set for message-specific defers (when all
4288 recipients are marked defer)
4289 DEFER => there was a non-message-specific delivery problem;
4290 ERROR => there was a problem setting up the arguments for a filter,
4291 or there was a problem with expanding added headers
4292 */
4293
4294 /* If the result is not OK, there was a non-message-specific problem.
4295 If the result is DEFER, we need to write to the logs saying what happened
4296 for this particular host, except in the case of authentication and TLS
4297 failures, where the log has already been written. If all hosts defer a
4298 general message is written at the end. */
4299
4300 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4301 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4302 write_logs(first_addr, host);
4303
4304 #ifndef DISABLE_EVENT
4305 if (rc == DEFER)
4306 deferred_event_raise(first_addr, host);
4307 #endif
4308
4309 /* If STARTTLS was accepted, but there was a failure in setting up the
4310 TLS session (usually a certificate screwup), and the host is not in
4311 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4312 TLS forcibly turned off. We have to start from scratch with a new SMTP
4313 connection. That's why the retry is done from here, not from within
4314 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4315 session, so the in-clear transmission after those errors, if permitted,
4316 happens inside smtp_deliver().] */
4317
4318 #ifdef SUPPORT_TLS
4319 if ( rc == DEFER
4320 && first_addr->basic_errno == ERRNO_TLSFAILURE
4321 && ob->tls_tempfail_tryclear
4322 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4323 )
4324 {
4325 log_write(0, LOG_MAIN,
4326 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4327 first_addr->message, host->name, host->address);
4328 first_addr = prepare_addresses(addrlist, host);
4329 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4330 &message_defer, TRUE);
4331 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4332 write_logs(first_addr, host);
4333 # ifndef DISABLE_EVENT
4334 if (rc == DEFER)
4335 deferred_event_raise(first_addr, host);
4336 # endif
4337 }
4338 #endif /*SUPPORT_TLS*/
4339 }
4340
4341 /* Delivery attempt finished */
4342
4343 rs = rc == OK ? US"OK"
4344 : rc == DEFER ? US"DEFER"
4345 : rc == ERROR ? US"ERROR"
4346 : US"?";
4347
4348 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4349 message_id, host->name, host->address, addrlist->address,
4350 addrlist->next ? " (& others)" : "", rs);
4351
4352 /* Release serialization if set up */
4353
4354 if (serialize_key) enq_end(serialize_key);
4355
4356 /* If the result is DEFER, or if a host retry record is known to exist, we
4357 need to add an item to the retry chain for updating the retry database
4358 at the end of delivery. We only need to add the item to the top address,
4359 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4360 for any other delivery attempts using the same address. (It is copied into
4361 the unusable tree at the outer level, so even if different address blocks
4362 contain the same address, it still won't get tried again.) */
4363
4364 if (rc == DEFER || retry_host_key)
4365 {
4366 int delete_flag = rc != DEFER ? rf_delete : 0;
4367 if (!retry_host_key)
4368 {
4369 BOOL incl_ip;
4370 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4371 US"retry_include_ip_address", ob->retry_include_ip_address,
4372 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4373 incl_ip = TRUE; /* error; use most-specific retry record */
4374
4375 retry_host_key = incl_ip
4376 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4377 : string_sprintf("T:%S%s", host->name, pistring);
4378 }
4379
4380 /* If a delivery of another message over an existing SMTP connection
4381 yields DEFER, we do NOT set up retry data for the host. This covers the
4382 case when there are delays in routing the addresses in the second message
4383 that are so long that the server times out. This is alleviated by not
4384 routing addresses that previously had routing defers when handling an
4385 existing connection, but even so, this case may occur (e.g. if a
4386 previously happily routed address starts giving routing defers). If the
4387 host is genuinely down, another non-continued message delivery will
4388 notice it soon enough. */
4389
4390 if (delete_flag != 0 || !continue_hostname)
4391 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4392
4393 /* We may have tried an expired host, if its retry time has come; ensure
4394 the status reflects the expiry for the benefit of any other addresses. */
4395
4396 if (rc == DEFER)
4397 {
4398 host->status = host_is_expired
4399 ? hstatus_unusable_expired : hstatus_unusable;
4400 host->why = hwhy_deferred;
4401 }
4402 }
4403
4404 /* If message_defer is set (host was OK, but every recipient got deferred
4405 because of some message-specific problem), or if that had happened
4406 previously so that a message retry key exists, add an appropriate item
4407 to the retry chain. Note that if there was a message defer but now there is
4408 a host defer, the message defer record gets deleted. That seems perfectly
4409 reasonable. Also, stop the message from being remembered as waiting
4410 for specific hosts. */
4411
4412 if (message_defer || retry_message_key)
4413 {
4414 int delete_flag = message_defer ? 0 : rf_delete;
4415 if (!retry_message_key)
4416 {
4417 BOOL incl_ip;
4418 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4419 US"retry_include_ip_address", ob->retry_include_ip_address,
4420 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4421 incl_ip = TRUE; /* error; use most-specific retry record */
4422
4423 retry_message_key = incl_ip
4424 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4425 message_id)
4426 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4427 }
4428 retry_add_item(addrlist, retry_message_key,
4429 rf_message | rf_host | delete_flag);
4430 update_waiting = FALSE;
4431 }
4432
4433 /* Any return other than DEFER (that is, OK or ERROR) means that the
4434 addresses have got their final statuses filled in for this host. In the OK
4435 case, see if any of them are deferred. */
4436
4437 if (rc == OK)
4438 for (addr = addrlist; addr; addr = addr->next)
4439 if (addr->transport_return == DEFER)
4440 {
4441 some_deferred = TRUE;
4442 break;
4443 }
4444
4445 /* If no addresses deferred or the result was ERROR, return. We do this for
4446 ERROR because a failing filter set-up or add_headers expansion is likely to
4447 fail for any host we try. */
4448
4449 if (rc == ERROR || (rc == OK && !some_deferred))
4450 {
4451 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4452 return TRUE; /* Each address has its status */
4453 }
4454
4455 /* If the result was DEFER or some individual addresses deferred, let
4456 the loop run to try other hosts with the deferred addresses, except for the
4457 case when we were trying to deliver down an existing channel and failed.
4458 Don't try any other hosts in this case. */
4459
4460 if (continue_hostname) break;
4461
4462 /* If the whole delivery, or some individual addresses, were deferred and
4463 there are more hosts that could be tried, do not count this host towards
4464 the hosts_max_try limit if the age of the message is greater than the
4465 maximum retry time for this host. This means we may try try all hosts,
4466 ignoring the limit, when messages have been around for some time. This is
4467 important because if we don't try all hosts, the address will never time
4468 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4469
4470 if ((rc == DEFER || some_deferred) && nexthost)
4471 {
4472 BOOL timedout;
4473 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4474
4475 if (retry && retry->rules)
4476 {
4477 retry_rule *last_rule;
4478 for (last_rule = retry->rules;
4479 last_rule->next;
4480 last_rule = last_rule->next);
4481 timedout = time(NULL) - received_time > last_rule->timeout;
4482 }
4483 else timedout = TRUE; /* No rule => timed out */
4484
4485 if (timedout)
4486 {
4487 unexpired_hosts_tried--;
4488 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4489 "hosts_max_try (message older than host's retry time)\n");
4490 }
4491 }
4492 } /* End of loop for trying multiple hosts. */
4493
4494 /* This is the end of the loop that repeats iff expired is TRUE and
4495 ob->delay_after_cutoff is FALSE. The second time round we will
4496 try those hosts that haven't been tried since the message arrived. */
4497
4498 DEBUG(D_transport)
4499 {
4500 debug_printf("all IP addresses skipped or deferred at least one address\n");
4501 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4502 debug_printf("retrying IP addresses not tried since message arrived\n");
4503 }
4504 }
4505
4506
4507 /* Get here if all IP addresses are skipped or defer at least one address. In
4508 MUA wrapper mode, this will happen only for connection or other non-message-
4509 specific failures. Force the delivery status for all addresses to FAIL. */
4510
4511 if (mua_wrapper)
4512 {
4513 for (addr = addrlist; addr; addr = addr->next)
4514 addr->transport_return = FAIL;
4515 goto END_TRANSPORT;
4516 }
4517
4518 /* In the normal, non-wrapper case, add a standard message to each deferred
4519 address if there hasn't been an error, that is, if it hasn't actually been
4520 tried this time. The variable "expired" will be FALSE if any deliveries were
4521 actually tried, or if there was at least one host that was not expired. That
4522 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4523 a delivery has been tried, an error code will be set, and the failing of the
4524 message is handled by the retry code later.
4525
4526 If queue_smtp is set, or this transport was called to send a subsequent message
4527 down an existing TCP/IP connection, and something caused the host not to be
4528 found, we end up here, but can detect these cases and handle them specially. */
4529
4530 for (addr = addrlist; addr; addr = addr->next)
4531 {
4532 /* If host is not NULL, it means that we stopped processing the host list
4533 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4534 means we need to behave as if some hosts were skipped because their retry
4535 time had not come. Specifically, this prevents the address from timing out.
4536 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4537 hosts were tried. */
4538
4539 if (host)
4540 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4541 {
4542 DEBUG(D_transport)
4543 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4544 "hosts were tried\n");
4545 }
4546 else
4547 {
4548 DEBUG(D_transport)
4549 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4550 setflag(addr, af_retry_skipped);
4551 }
4552
4553 if (queue_smtp) /* no deliveries attempted */
4554 {
4555 addr->transport_return = DEFER;
4556 addr->basic_errno = 0;
4557 addr->message = US"SMTP delivery explicitly queued";
4558 }
4559
4560 else if ( addr->transport_return == DEFER
4561 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4562 && !addr->message
4563 )
4564 {
4565 addr->basic_errno = ERRNO_HRETRY;
4566 if (continue_hostname)
4567 addr->message = US"no host found for existing SMTP connection";
4568 else if (expired)
4569 {
4570 setflag(addr, af_pass_message); /* This is not a security risk */
4571 addr->message = string_sprintf(
4572 "all hosts%s have been failing for a long time %s",
4573 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4574 ob->delay_after_cutoff
4575 ? US"(and retry time not reached)"
4576 : US"and were last tried after this message arrived");
4577
4578 /* If we are already using fallback hosts, or there are no fallback hosts
4579 defined, convert the result to FAIL to cause a bounce. */
4580
4581 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4582 addr->transport_return = FAIL;
4583 }
4584 else
4585 {
4586 const char * s;
4587 if (hosts_retry == hosts_total)
4588 s = "retry time not reached for any host%s";
4589 else if (hosts_fail == hosts_total)
4590 s = "all host address lookups%s failed permanently";
4591 else if (hosts_defer == hosts_total)
4592 s = "all host address lookups%s failed temporarily";
4593 else if (hosts_serial == hosts_total)
4594 s = "connection limit reached for all hosts%s";
4595 else if (hosts_fail+hosts_defer == hosts_total)
4596 s = "all host address lookups%s failed";
4597 else
4598 s = "some host address lookups failed and retry time "
4599 "not reached for other hosts or connection limit reached%s";
4600
4601 addr->message = string_sprintf(s,
4602 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4603 }
4604 }
4605 }
4606
4607 /* Update the database which keeps information about which messages are waiting
4608 for which hosts to become available. For some message-specific errors, the
4609 update_waiting flag is turned off because we don't want follow-on deliveries in
4610 those cases. If this transport instance is explicitly limited to one message
4611 per connection then follow-on deliveries are not possible and there's no need
4612 to create/update the per-transport wait-<transport_name> database. */
4613
4614 if (update_waiting && tblock->connection_max_messages != 1)
4615 transport_update_waiting(hostlist, tblock->name);
4616
4617 END_TRANSPORT:
4618
4619 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4620
4621 return TRUE; /* Each address has its status */
4622 }
4623
4624 #endif /*!MACRO_PREDEF*/
4625 /* vi: aw ai sw=2
4626 */
4627 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.