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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 - 2018 */
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 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
49 #ifndef DISABLE_DKIM
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
68 #endif
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
93 #ifdef SUPPORT_TLS
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
96 #endif
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
101 #ifdef SUPPORT_TLS
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 { "hosts_randomize", opt_bool,
110 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
111 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
112 { "hosts_request_ocsp", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 #endif
115 { "hosts_require_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 #ifdef SUPPORT_TLS
118 # ifdef SUPPORT_DANE
119 { "hosts_require_dane", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # endif
122 # ifndef DISABLE_OCSP
123 { "hosts_require_ocsp", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 # endif
126 { "hosts_require_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 #endif
129 { "hosts_try_auth", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
131 { "hosts_try_chunking", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
133 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
134 { "hosts_try_dane", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
136 #endif
137 { "hosts_try_fastopen", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
139 #ifndef DISABLE_PRDR
140 { "hosts_try_prdr", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
142 #endif
143 #ifdef SUPPORT_TLS
144 { "hosts_verify_avoid_tls", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
146 #endif
147 { "interface", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, interface) },
149 { "keepalive", opt_bool,
150 (void *)offsetof(smtp_transport_options_block, keepalive) },
151 { "lmtp_ignore_quota", opt_bool,
152 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
153 { "max_rcpt", opt_int | opt_public,
154 (void *)offsetof(transport_instance, max_addresses) },
155 { "multi_domain", opt_expand_bool | opt_public,
156 (void *)offsetof(transport_instance, multi_domain) },
157 { "port", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, port) },
159 { "protocol", opt_stringptr,
160 (void *)offsetof(smtp_transport_options_block, protocol) },
161 { "retry_include_ip_address", opt_expand_bool,
162 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
163 { "serialize_hosts", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
165 { "size_addition", opt_int,
166 (void *)offsetof(smtp_transport_options_block, size_addition) }
167 #ifdef SUPPORT_SOCKS
168 ,{ "socks_proxy", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
170 #endif
171 #ifdef SUPPORT_TLS
172 ,{ "tls_certificate", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
174 { "tls_crl", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_crl) },
176 { "tls_dh_min_bits", opt_int,
177 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
178 { "tls_privatekey", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
180 { "tls_require_ciphers", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
182 { "tls_sni", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_sni) },
184 { "tls_tempfail_tryclear", opt_bool,
185 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
186 { "tls_try_verify_hosts", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
188 { "tls_verify_cert_hostnames", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
190 { "tls_verify_certificates", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
192 { "tls_verify_hosts", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
194 #endif
195 };
196
197 /* Size of the options list. An extern variable has to be used so that its
198 address can appear in the tables drtables.c. */
199
200 int smtp_transport_options_count =
201 sizeof(smtp_transport_options)/sizeof(optionlist);
202
203
204 #ifdef MACRO_PREDEF
205
206 /* Dummy values */
207 smtp_transport_options_block smtp_transport_option_defaults = {0};
208 void smtp_transport_init(transport_instance *tblock) {}
209 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
210 void smtp_transport_closedown(transport_instance *tblock) {}
211
212 #else /*!MACRO_PREDEF*/
213
214
215 /* Default private options block for the smtp transport. */
216
217 smtp_transport_options_block smtp_transport_option_defaults = {
218 .hosts = NULL,
219 .fallback_hosts = NULL,
220 .hostlist = NULL,
221 .fallback_hostlist = NULL,
222 .helo_data = US"$primary_hostname",
223 .interface = NULL,
224 .port = NULL,
225 .protocol = US"smtp",
226 .dscp = NULL,
227 .serialize_hosts = NULL,
228 .hosts_try_auth = NULL,
229 .hosts_require_auth = NULL,
230 .hosts_try_chunking = US"*",
231 #ifdef SUPPORT_DANE
232 .hosts_try_dane = NULL,
233 .hosts_require_dane = NULL,
234 .dane_require_tls_ciphers = NULL,
235 #endif
236 .hosts_try_fastopen = NULL,
237 #ifndef DISABLE_PRDR
238 .hosts_try_prdr = US"*",
239 #endif
240 #ifndef DISABLE_OCSP
241 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
242 .hosts_require_ocsp = NULL,
243 #endif
244 .hosts_require_tls = NULL,
245 .hosts_avoid_tls = NULL,
246 .hosts_verify_avoid_tls = NULL,
247 .hosts_avoid_pipelining = NULL,
248 .hosts_avoid_esmtp = NULL,
249 #ifdef SUPPORT_TLS
250 .hosts_nopass_tls = NULL,
251 .hosts_noproxy_tls = US"*",
252 #endif
253 .command_timeout = 5*60,
254 .connect_timeout = 5*60,
255 .data_timeout = 5*60,
256 .final_timeout = 10*60,
257 .size_addition = 1024,
258 .hosts_max_try = 5,
259 .hosts_max_try_hardlimit = 50,
260 .address_retry_include_sender = TRUE,
261 .allow_localhost = FALSE,
262 .authenticated_sender_force = FALSE,
263 .gethostbyname = FALSE,
264 .dns_qualify_single = TRUE,
265 .dns_search_parents = FALSE,
266 .dnssec = { .request=NULL, .require=NULL },
267 .delay_after_cutoff = TRUE,
268 .hosts_override = FALSE,
269 .hosts_randomize = FALSE,
270 .keepalive = TRUE,
271 .lmtp_ignore_quota = FALSE,
272 .expand_retry_include_ip_address = NULL,
273 .retry_include_ip_address = TRUE,
274 #ifdef SUPPORT_SOCKS
275 .socks_proxy = NULL,
276 #endif
277 #ifdef SUPPORT_TLS
278 .tls_certificate = NULL,
279 .tls_crl = NULL,
280 .tls_privatekey = NULL,
281 .tls_require_ciphers = NULL,
282 .tls_sni = NULL,
283 .tls_verify_certificates = US"system",
284 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
285 .tls_tempfail_tryclear = TRUE,
286 .tls_verify_hosts = NULL,
287 .tls_try_verify_hosts = US"*",
288 .tls_verify_cert_hostnames = US"*",
289 #endif
290 #ifndef DISABLE_DKIM
291 .dkim =
292 {.dkim_domain = NULL,
293 .dkim_identity = NULL,
294 .dkim_private_key = NULL,
295 .dkim_selector = NULL,
296 .dkim_canon = NULL,
297 .dkim_sign_headers = NULL,
298 .dkim_strict = NULL,
299 .dkim_hash = US"sha256",
300 .dkim_timestamps = NULL,
301 .dot_stuffed = FALSE,
302 .force_bodyhash = FALSE,
303 # ifdef EXPERIMENTAL_ARC
304 .arc_signspec = NULL,
305 # endif
306 },
307 # ifdef EXPERIMENTAL_ARC
308 .arc_sign = NULL,
309 # endif
310 #endif
311 };
312
313 /* some DSN flags for use later */
314
315 static int rf_list[] = {rf_notify_never, rf_notify_success,
316 rf_notify_failure, rf_notify_delay };
317
318 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
319
320
321
322 /* Local statics */
323
324 static uschar *smtp_command; /* Points to last cmd for error messages */
325 static uschar *mail_command; /* Points to MAIL cmd for error messages */
326 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
327 static BOOL update_waiting; /* TRUE to update the "wait" database */
328
329 /*XXX move to smtp_context */
330 static BOOL pipelining_active; /* current transaction is in pipe mode */
331
332
333 /*************************************************
334 * Setup entry point *
335 *************************************************/
336
337 /* This function is called when the transport is about to be used,
338 but before running it in a sub-process. It is used for two things:
339
340 (1) To set the fallback host list in addresses, when delivering.
341 (2) To pass back the interface, port, protocol, and other options, for use
342 during callout verification.
343
344 Arguments:
345 tblock pointer to the transport instance block
346 addrlist list of addresses about to be transported
347 tf if not NULL, pointer to block in which to return options
348 uid the uid that will be set (not used)
349 gid the gid that will be set (not used)
350 errmsg place for error message (not used)
351
352 Returns: OK always (FAIL, DEFER not used)
353 */
354
355 static int
356 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
357 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
358 {
359 smtp_transport_options_block *ob =
360 (smtp_transport_options_block *)(tblock->options_block);
361
362 errmsg = errmsg; /* Keep picky compilers happy */
363 uid = uid;
364 gid = gid;
365
366 /* Pass back options if required. This interface is getting very messy. */
367
368 if (tf)
369 {
370 tf->interface = ob->interface;
371 tf->port = ob->port;
372 tf->protocol = ob->protocol;
373 tf->hosts = ob->hosts;
374 tf->hosts_override = ob->hosts_override;
375 tf->hosts_randomize = ob->hosts_randomize;
376 tf->gethostbyname = ob->gethostbyname;
377 tf->qualify_single = ob->dns_qualify_single;
378 tf->search_parents = ob->dns_search_parents;
379 tf->helo_data = ob->helo_data;
380 }
381
382 /* Set the fallback host list for all the addresses that don't have fallback
383 host lists, provided that the local host wasn't present in the original host
384 list. */
385
386 if (!testflag(addrlist, af_local_host_removed))
387 for (; addrlist; addrlist = addrlist->next)
388 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
389
390 return OK;
391 }
392
393
394
395 /*************************************************
396 * Initialization entry point *
397 *************************************************/
398
399 /* Called for each instance, after its options have been read, to
400 enable consistency checks to be done, or anything else that needs
401 to be set up.
402
403 Argument: pointer to the transport instance block
404 Returns: nothing
405 */
406
407 void
408 smtp_transport_init(transport_instance *tblock)
409 {
410 smtp_transport_options_block *ob =
411 (smtp_transport_options_block *)(tblock->options_block);
412
413 /* Retry_use_local_part defaults FALSE if unset */
414
415 if (tblock->retry_use_local_part == TRUE_UNSET)
416 tblock->retry_use_local_part = FALSE;
417
418 /* Set the default port according to the protocol */
419
420 if (ob->port == NULL)
421 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
422 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
423
424 /* Set up the setup entry point, to be called before subprocesses for this
425 transport. */
426
427 tblock->setup = smtp_transport_setup;
428
429 /* Complain if any of the timeouts are zero. */
430
431 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
432 ob->final_timeout <= 0)
433 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
434 "command, data, or final timeout value is zero for %s transport",
435 tblock->name);
436
437 /* If hosts_override is set and there are local hosts, set the global
438 flag that stops verify from showing router hosts. */
439
440 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
441
442 /* If there are any fallback hosts listed, build a chain of host items
443 for them, but do not do any lookups at this time. */
444
445 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
446 }
447
448
449
450
451
452 /*************************************************
453 * Set delivery info into all active addresses *
454 *************************************************/
455
456 /* Only addresses whose status is >= PENDING are relevant. A lesser
457 status means that an address is not currently being processed.
458
459 Arguments:
460 addrlist points to a chain of addresses
461 errno_value to put in each address's errno field
462 msg to put in each address's message field
463 rc to put in each address's transport_return field
464 pass_message if TRUE, set the "pass message" flag in the address
465 host if set, mark addrs as having used this host
466 smtp_greeting from peer
467 helo_response from peer
468
469 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
470 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
471 this particular type of timeout.
472
473 Returns: nothing
474 */
475
476 static void
477 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
478 BOOL pass_message, host_item * host
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , const uschar * smtp_greeting, const uschar * helo_response
481 #endif
482 )
483 {
484 address_item *addr;
485 int orvalue = 0;
486 if (errno_value == ERRNO_CONNECTTIMEOUT)
487 {
488 errno_value = ETIMEDOUT;
489 orvalue = RTEF_CTOUT;
490 }
491 for (addr = addrlist; addr; addr = addr->next)
492 if (addr->transport_return >= PENDING)
493 {
494 addr->basic_errno = errno_value;
495 addr->more_errno |= orvalue;
496 if (msg)
497 {
498 addr->message = msg;
499 if (pass_message) setflag(addr, af_pass_message);
500 }
501 addr->transport_return = rc;
502 if (host)
503 {
504 addr->host_used = host;
505 #ifdef EXPERIMENTAL_DSN_INFO
506 if (smtp_greeting)
507 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
508 addr->smtp_greeting = smtp_greeting;
509
510 if (helo_response)
511 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
512 addr->helo_response = helo_response;
513 #endif
514 }
515 }
516 }
517
518 static void
519 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
520 BOOL pass_message)
521 {
522 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
523 #ifdef EXPERIMENTAL_DSN_INFO
524 , NULL, NULL
525 #endif
526 );
527 }
528
529
530 /*************************************************
531 * Check an SMTP response *
532 *************************************************/
533
534 /* This function is given an errno code and the SMTP response buffer
535 to analyse, together with the host identification for generating messages. It
536 sets an appropriate message and puts the first digit of the response code into
537 the yield variable. If no response was actually read, a suitable digit is
538 chosen.
539
540 Arguments:
541 host the current host, to get its name for messages
542 errno_value pointer to the errno value
543 more_errno from the top address for use with ERRNO_FILTER_FAIL
544 buffer the SMTP response buffer
545 yield where to put a one-digit SMTP response code
546 message where to put an error message
547 pass_message set TRUE if message is an SMTP response
548
549 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
550 */
551
552 static BOOL
553 check_response(host_item *host, int *errno_value, int more_errno,
554 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
555 {
556 uschar * pl = pipelining_active ? US"pipelined " : US"";
557 const uschar * s;
558
559 *yield = '4'; /* Default setting is to give a temporary error */
560
561 switch(*errno_value)
562 {
563 case ETIMEDOUT: /* Handle response timeout */
564 *message = US string_sprintf("SMTP timeout after %s%s",
565 pl, smtp_command);
566 if (transport_count > 0)
567 *message = US string_sprintf("%s (%d bytes written)", *message,
568 transport_count);
569 return FALSE;
570
571 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
572 s = string_printing(buffer);
573 while (isspace(*s)) s++;
574 *message = *s == 0
575 ? string_sprintf("Malformed SMTP reply (an empty line) "
576 "in response to %s%s", pl, smtp_command)
577 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
578 pl, smtp_command, s);
579 return FALSE;
580
581 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
582 can't send QUIT as we mustn't end the DATA. */
583 *message = string_sprintf("transport filter process failed (%d)%s",
584 more_errno,
585 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
586 return FALSE;
587
588 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
589 can't send QUIT as we mustn't end the DATA. */
590 *message =
591 string_sprintf("failed to expand headers_add or headers_remove: %s",
592 expand_string_message);
593 return FALSE;
594
595 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
596 *message = string_sprintf("failed to write a data block");
597 return FALSE;
598
599 #ifdef SUPPORT_I18N
600 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
601 *message = US"utf8 support required but not offered for forwarding";
602 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
603 return TRUE;
604 #endif
605 }
606
607 /* Handle error responses from the remote mailer. */
608
609 if (buffer[0] != 0)
610 {
611 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
612 "%s", pl, smtp_command, s = string_printing(buffer));
613 *pass_message = TRUE;
614 *yield = buffer[0];
615 return TRUE;
616 }
617
618 /* No data was read. If there is no errno, this must be the EOF (i.e.
619 connection closed) case, which causes deferral. An explicit connection reset
620 error has the same effect. Otherwise, put the host's identity in the message,
621 leaving the errno value to be interpreted as well. In all cases, we have to
622 assume the connection is now dead. */
623
624 if (*errno_value == 0 || *errno_value == ECONNRESET)
625 {
626 *errno_value = ERRNO_SMTPCLOSED;
627 *message = US string_sprintf("Remote host closed connection "
628 "in response to %s%s", pl, smtp_command);
629 }
630 else
631 *message = US string_sprintf("%s [%s]", host->name, host->address);
632
633 return FALSE;
634 }
635
636
637
638 /*************************************************
639 * Write error message to logs *
640 *************************************************/
641
642 /* This writes to the main log and to the message log.
643
644 Arguments:
645 host the current host
646 detail the current message (addr_item->message)
647 basic_errno the errno (addr_item->basic_errno)
648
649 Returns: nothing
650 */
651
652 static void
653 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
654 {
655
656
657 uschar *message = LOGGING(outgoing_port)
658 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
659 host->port == PORT_NONE ? 25 : host->port)
660 : string_sprintf("H=%s [%s]", host->name, host->address);
661
662 if (suffix)
663 {
664 message = string_sprintf("%s: %s", message, suffix);
665 if (basic_errno > 0)
666 message = string_sprintf("%s: %s", message, strerror(basic_errno));
667 }
668 else
669 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
670
671 log_write(0, LOG_MAIN, "%s", message);
672 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
673 }
674
675 static void
676 msglog_line(host_item * host, uschar * message)
677 {
678 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
679 host->name, host->address, message);
680 }
681
682
683
684 #ifndef DISABLE_EVENT
685 /*************************************************
686 * Post-defer action *
687 *************************************************/
688
689 /* This expands an arbitrary per-transport string.
690 It might, for example, be used to write to the database log.
691
692 Arguments:
693 addr the address item containing error information
694 host the current host
695
696 Returns: nothing
697 */
698
699 static void
700 deferred_event_raise(address_item *addr, host_item *host)
701 {
702 uschar * action = addr->transport->event_action;
703 const uschar * save_domain;
704 uschar * save_local;
705
706 if (!action)
707 return;
708
709 save_domain = deliver_domain;
710 save_local = deliver_localpart;
711
712 /*XXX would ip & port already be set up? */
713 deliver_host_address = string_copy(host->address);
714 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
715 event_defer_errno = addr->basic_errno;
716
717 router_name = addr->router->name;
718 transport_name = addr->transport->name;
719 deliver_domain = addr->domain;
720 deliver_localpart = addr->local_part;
721
722 (void) event_raise(action, US"msg:host:defer",
723 addr->message
724 ? addr->basic_errno > 0
725 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
726 : string_copy(addr->message)
727 : addr->basic_errno > 0
728 ? string_copy(US strerror(addr->basic_errno))
729 : NULL);
730
731 deliver_localpart = save_local;
732 deliver_domain = save_domain;
733 router_name = transport_name = NULL;
734 }
735 #endif
736
737 /*************************************************
738 * Synchronize SMTP responses *
739 *************************************************/
740
741 /* This function is called from smtp_deliver() to receive SMTP responses from
742 the server, and match them up with the commands to which they relate. When
743 PIPELINING is not in use, this function is called after every command, and is
744 therefore somewhat over-engineered, but it is simpler to use a single scheme
745 that works both with and without PIPELINING instead of having two separate sets
746 of code.
747
748 The set of commands that are buffered up with pipelining may start with MAIL
749 and may end with DATA; in between are RCPT commands that correspond to the
750 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
751 etc.) are never buffered.
752
753 Errors after MAIL or DATA abort the whole process leaving the response in the
754 buffer. After MAIL, pending responses are flushed, and the original command is
755 re-instated in big_buffer for error messages. For RCPT commands, the remote is
756 permitted to reject some recipient addresses while accepting others. However
757 certain errors clearly abort the whole process. Set the value in
758 transport_return to PENDING_OK if the address is accepted. If there is a
759 subsequent general error, it will get reset accordingly. If not, it will get
760 converted to OK at the end.
761
762 Arguments:
763 sx smtp connection context
764 count the number of responses to read
765 pending_DATA 0 if last command sent was not DATA
766 +1 if previously had a good recipient
767 -1 if not previously had a good recipient
768
769 Returns: 3 if at least one address had 2xx and one had 5xx
770 2 if at least one address had 5xx but none had 2xx
771 1 if at least one host had a 2xx response, but none had 5xx
772 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
773 -1 timeout while reading RCPT response
774 -2 I/O or other non-response error for RCPT
775 -3 DATA or MAIL failed - errno and buffer set
776 */
777
778 static int
779 sync_responses(smtp_context * sx, int count, int pending_DATA)
780 {
781 address_item *addr = sx->sync_addr;
782 smtp_transport_options_block *ob =
783 (smtp_transport_options_block *)sx->tblock->options_block;
784 int yield = 0;
785
786 /* Handle the response for a MAIL command. On error, reinstate the original
787 command in big_buffer for error message use, and flush any further pending
788 responses before returning, except after I/O errors and timeouts. */
789
790 if (sx->pending_MAIL)
791 {
792 count--;
793 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
794 '2', ob->command_timeout))
795 {
796 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
797 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
798 if (errno == 0 && sx->buffer[0] != 0)
799 {
800 uschar flushbuffer[4096];
801 int save_errno = 0;
802 if (sx->buffer[0] == '4')
803 {
804 save_errno = ERRNO_MAIL4XX;
805 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
806 }
807 while (count-- > 0)
808 {
809 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
810 '2', ob->command_timeout)
811 && (errno != 0 || flushbuffer[0] == 0))
812 break;
813 }
814 errno = save_errno;
815 }
816
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
818 while (count-- > 0) /* Mark any pending addrs with the host used */
819 {
820 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
821 addr->host_used = sx->host;
822 addr = addr->next;
823 }
824 return -3;
825 }
826 }
827
828 if (pending_DATA) count--; /* Number of RCPT responses to come */
829
830 /* Read and handle the required number of RCPT responses, matching each one up
831 with an address by scanning for the next address whose status is PENDING_DEFER.
832 */
833
834 while (count-- > 0)
835 {
836 while (addr->transport_return != PENDING_DEFER)
837 if (!(addr = addr->next))
838 return -2;
839
840 /* The address was accepted */
841 addr->host_used = sx->host;
842
843 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
844 '2', ob->command_timeout))
845 {
846 yield |= 1;
847 addr->transport_return = PENDING_OK;
848
849 /* If af_dr_retry_exists is set, there was a routing delay on this address;
850 ensure that any address-specific retry record is expunged. We do this both
851 for the basic key and for the version that also includes the sender. */
852
853 if (testflag(addr, af_dr_retry_exists))
854 {
855 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
856 sender_address);
857 retry_add_item(addr, altkey, rf_delete);
858 retry_add_item(addr, addr->address_retry_key, rf_delete);
859 }
860 }
861
862 /* Timeout while reading the response */
863
864 else if (errno == ETIMEDOUT)
865 {
866 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
867 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
868 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
869 retry_add_item(addr, addr->address_retry_key, 0);
870 update_waiting = FALSE;
871 return -1;
872 }
873
874 /* Handle other errors in obtaining an SMTP response by returning -1. This
875 will cause all the addresses to be deferred. Restore the SMTP command in
876 big_buffer for which we are checking the response, so the error message
877 makes sense. */
878
879 else if (errno != 0 || sx->buffer[0] == 0)
880 {
881 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
882 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
883 return -2;
884 }
885
886 /* Handle SMTP permanent and temporary response codes. */
887
888 else
889 {
890 addr->message =
891 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
892 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
893 string_printing(sx->buffer));
894 setflag(addr, af_pass_message);
895 if (!sx->verify)
896 msglog_line(sx->host, addr->message);
897
898 /* The response was 5xx */
899
900 if (sx->buffer[0] == '5')
901 {
902 addr->transport_return = FAIL;
903 yield |= 2;
904 }
905
906 /* The response was 4xx */
907
908 else
909 {
910 addr->transport_return = DEFER;
911 addr->basic_errno = ERRNO_RCPT4XX;
912 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
913
914 if (!sx->verify)
915 {
916 #ifndef DISABLE_EVENT
917 event_defer_errno = addr->more_errno;
918 msg_event_raise(US"msg:rcpt:host:defer", addr);
919 #endif
920
921 /* Log temporary errors if there are more hosts to be tried.
922 If not, log this last one in the == line. */
923
924 if (sx->host->next)
925 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
926 sx->host->name, sx->host->address, addr->message);
927
928 #ifndef DISABLE_EVENT
929 else
930 msg_event_raise(US"msg:rcpt:defer", addr);
931 #endif
932
933 /* Do not put this message on the list of those waiting for specific
934 hosts, as otherwise it is likely to be tried too often. */
935
936 update_waiting = FALSE;
937
938 /* Add a retry item for the address so that it doesn't get tried again
939 too soon. If address_retry_include_sender is true, add the sender address
940 to the retry key. */
941
942 retry_add_item(addr,
943 ob->address_retry_include_sender
944 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
945 : addr->address_retry_key,
946 0);
947 }
948 }
949 }
950 } /* Loop for next RCPT response */
951
952 /* Update where to start at for the next block of responses, unless we
953 have already handled all the addresses. */
954
955 if (addr) sx->sync_addr = addr->next;
956
957 /* Handle a response to DATA. If we have not had any good recipients, either
958 previously or in this block, the response is ignored. */
959
960 if (pending_DATA != 0 &&
961 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
962 '3', ob->command_timeout))
963 {
964 int code;
965 uschar *msg;
966 BOOL pass_message;
967 if (pending_DATA > 0 || (yield & 1) != 0)
968 {
969 if (errno == 0 && sx->buffer[0] == '4')
970 {
971 errno = ERRNO_DATA4XX;
972 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
973 }
974 return -3;
975 }
976 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
977 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
978 "is in use and there were no good recipients\n", msg);
979 }
980
981 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
982 present) received 3xx. If any RCPTs were handled and yielded anything other
983 than 4xx, yield will be set non-zero. */
984
985 return yield;
986 }
987
988
989
990 /* Do the client side of smtp-level authentication */
991 /*
992 Arguments:
993 buffer EHLO response from server (gets overwritten)
994 addrlist chain of potential addresses to deliver
995 host host to deliver to
996 ob transport options
997 ibp, obp comms channel control blocks
998
999 Returns:
1000 OK Success, or failed (but not required): global "smtp_authenticated" set
1001 DEFER Failed authentication (and was required)
1002 ERROR Internal problem
1003
1004 FAIL_SEND Failed communications - transmit
1005 FAIL - response
1006 */
1007
1008 int
1009 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1010 smtp_transport_options_block *ob, BOOL is_esmtp,
1011 smtp_inblock *ibp, smtp_outblock *obp)
1012 {
1013 int require_auth;
1014 uschar *fail_reason = US"server did not advertise AUTH support";
1015
1016 smtp_authenticated = FALSE;
1017 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1018 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1019
1020 if (is_esmtp && !regex_AUTH) regex_AUTH =
1021 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1022 FALSE, TRUE);
1023
1024 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1025 {
1026 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1027 expand_nmax = -1; /* reset */
1028
1029 /* Must not do this check until after we have saved the result of the
1030 regex match above. */
1031
1032 if (require_auth == OK ||
1033 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1034 {
1035 auth_instance *au;
1036 fail_reason = US"no common mechanisms were found";
1037
1038 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1039
1040 /* Scan the configured authenticators looking for one which is configured
1041 for use as a client, which is not suppressed by client_condition, and
1042 whose name matches an authentication mechanism supported by the server.
1043 If one is found, attempt to authenticate by calling its client function.
1044 */
1045
1046 for (au = auths; !smtp_authenticated && au; au = au->next)
1047 {
1048 uschar *p = names;
1049 if (!au->client ||
1050 (au->client_condition != NULL &&
1051 !expand_check_condition(au->client_condition, au->name,
1052 US"client authenticator")))
1053 {
1054 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1055 au->name,
1056 (au->client)? "client_condition is false" :
1057 "not configured as a client");
1058 continue;
1059 }
1060
1061 /* Loop to scan supported server mechanisms */
1062
1063 while (*p)
1064 {
1065 int rc;
1066 int len = Ustrlen(au->public_name);
1067 while (isspace(*p)) p++;
1068
1069 if (strncmpic(au->public_name, p, len) != 0 ||
1070 (p[len] != 0 && !isspace(p[len])))
1071 {
1072 while (*p != 0 && !isspace(*p)) p++;
1073 continue;
1074 }
1075
1076 /* Found data for a listed mechanism. Call its client entry. Set
1077 a flag in the outblock so that data is overwritten after sending so
1078 that reflections don't show it. */
1079
1080 fail_reason = US"authentication attempt(s) failed";
1081 obp->authenticating = TRUE;
1082 rc = (au->info->clientcode)(au, ibp, obp,
1083 ob->command_timeout, buffer, bufsize);
1084 obp->authenticating = FALSE;
1085 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1086 au->name, rc);
1087
1088 /* A temporary authentication failure must hold up delivery to
1089 this host. After a permanent authentication failure, we carry on
1090 to try other authentication methods. If all fail hard, try to
1091 deliver the message unauthenticated unless require_auth was set. */
1092
1093 switch(rc)
1094 {
1095 case OK:
1096 smtp_authenticated = TRUE; /* stops the outer loop */
1097 client_authenticator = au->name;
1098 if (au->set_client_id != NULL)
1099 client_authenticated_id = expand_string(au->set_client_id);
1100 break;
1101
1102 /* Failure after writing a command */
1103
1104 case FAIL_SEND:
1105 return FAIL_SEND;
1106
1107 /* Failure after reading a response */
1108
1109 case FAIL:
1110 if (errno != 0 || buffer[0] != '5') return FAIL;
1111 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1112 au->name, host->name, host->address, buffer);
1113 break;
1114
1115 /* Failure by some other means. In effect, the authenticator
1116 decided it wasn't prepared to handle this case. Typically this
1117 is the result of "fail" in an expansion string. Do we need to
1118 log anything here? Feb 2006: a message is now put in the buffer
1119 if logging is required. */
1120
1121 case CANCELLED:
1122 if (*buffer != 0)
1123 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1124 "authentication H=%s [%s] %s", au->name, host->name,
1125 host->address, buffer);
1126 break;
1127
1128 /* Internal problem, message in buffer. */
1129
1130 case ERROR:
1131 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1132 DEFER, FALSE);
1133 return ERROR;
1134 }
1135
1136 break; /* If not authenticated, try next authenticator */
1137 } /* Loop for scanning supported server mechanisms */
1138 } /* Loop for further authenticators */
1139 }
1140 }
1141
1142 /* If we haven't authenticated, but are required to, give up. */
1143
1144 if (require_auth == OK && !smtp_authenticated)
1145 {
1146 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1147 string_sprintf("authentication required but %s", fail_reason), DEFER,
1148 FALSE);
1149 return DEFER;
1150 }
1151
1152 return OK;
1153 }
1154
1155
1156 /* Construct AUTH appendix string for MAIL TO */
1157 /*
1158 Arguments
1159 buffer to build string
1160 addrlist chain of potential addresses to deliver
1161 ob transport options
1162
1163 Globals smtp_authenticated
1164 client_authenticated_sender
1165 Return True on error, otherwise buffer has (possibly empty) terminated string
1166 */
1167
1168 BOOL
1169 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1170 smtp_transport_options_block *ob)
1171 {
1172 uschar *local_authenticated_sender = authenticated_sender;
1173
1174 #ifdef notdef
1175 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1176 #endif
1177
1178 if (ob->authenticated_sender != NULL)
1179 {
1180 uschar *new = expand_string(ob->authenticated_sender);
1181 if (new == NULL)
1182 {
1183 if (!expand_string_forcedfail)
1184 {
1185 uschar *message = string_sprintf("failed to expand "
1186 "authenticated_sender: %s", expand_string_message);
1187 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1188 return TRUE;
1189 }
1190 }
1191 else if (new[0] != 0) local_authenticated_sender = new;
1192 }
1193
1194 /* Add the authenticated sender address if present */
1195
1196 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1197 local_authenticated_sender != NULL)
1198 {
1199 string_format(buffer, bufsize, " AUTH=%s",
1200 auth_xtextencode(local_authenticated_sender,
1201 Ustrlen(local_authenticated_sender)));
1202 client_authenticated_sender = string_copy(local_authenticated_sender);
1203 }
1204 else
1205 *buffer= 0;
1206
1207 return FALSE;
1208 }
1209
1210
1211
1212 #ifdef SUPPORT_DANE
1213 /* Lookup TLSA record for host/port.
1214 Return: OK success with dnssec; DANE mode
1215 DEFER Do not use this host now, may retry later
1216 FAIL_FORCED No TLSA record; DANE not usable
1217 FAIL Do not use this connection
1218 */
1219
1220 int
1221 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1222 {
1223 /* move this out to host.c given the similarity to dns_lookup() ? */
1224 uschar buffer[300];
1225 const uschar * fullname = buffer;
1226 int rc;
1227 BOOL sec;
1228
1229 /* TLSA lookup string */
1230 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1231
1232 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1233 sec = dns_is_secure(dnsa);
1234 DEBUG(D_transport)
1235 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1236
1237 switch (rc)
1238 {
1239 case DNS_AGAIN:
1240 return DEFER; /* just defer this TLS'd conn */
1241
1242 case DNS_SUCCEED:
1243 if (sec) return OK;
1244 log_write(0, LOG_MAIN,
1245 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1246 /*FALLTRHOUGH*/
1247
1248 case DNS_NODATA: /* no TLSA RR for this lookup */
1249 case DNS_NOMATCH: /* no records at all for this lookup */
1250 return dane_required ? FAIL : FAIL_FORCED;
1251
1252 default:
1253 case DNS_FAIL:
1254 return dane_required ? FAIL : DEFER;
1255 }
1256 }
1257 #endif
1258
1259
1260
1261 typedef struct smtp_compare_s
1262 {
1263 uschar *current_sender_address;
1264 struct transport_instance *tblock;
1265 } smtp_compare_t;
1266
1267
1268 /* Create a unique string that identifies this message, it is based on
1269 sender_address, helo_data and tls_certificate if enabled.
1270 */
1271
1272 static uschar *
1273 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1274 {
1275 address_item * addr1;
1276 uschar * if1 = US"";
1277 uschar * helo1 = US"";
1278 #ifdef SUPPORT_TLS
1279 uschar * tlsc1 = US"";
1280 #endif
1281 uschar * save_sender_address = sender_address;
1282 uschar * local_identity = NULL;
1283 smtp_transport_options_block * ob =
1284 (smtp_transport_options_block *)tblock->options_block;
1285
1286 sender_address = sender;
1287
1288 addr1 = deliver_make_addr (sender, TRUE);
1289 deliver_set_expansions(addr1);
1290
1291 if (ob->interface)
1292 if1 = expand_string(ob->interface);
1293
1294 if (ob->helo_data)
1295 helo1 = expand_string(ob->helo_data);
1296
1297 #ifdef SUPPORT_TLS
1298 if (ob->tls_certificate)
1299 tlsc1 = expand_string(ob->tls_certificate);
1300 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1301 #else
1302 local_identity = string_sprintf ("%s^%s", if1, helo1);
1303 #endif
1304
1305 deliver_set_expansions(NULL);
1306 sender_address = save_sender_address;
1307
1308 return local_identity;
1309 }
1310
1311
1312
1313 /* This routine is a callback that is called from transport_check_waiting.
1314 This function will evaluate the incoming message versus the previous
1315 message. If the incoming message is using a different local identity then
1316 we will veto this new message. */
1317
1318 static BOOL
1319 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1320 {
1321 uschar * message_local_identity,
1322 * current_local_identity,
1323 * new_sender_address;
1324
1325 current_local_identity =
1326 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1327
1328 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1329 return 0;
1330
1331 message_local_identity =
1332 smtp_local_identity(new_sender_address, s_compare->tblock);
1333
1334 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1335 }
1336
1337
1338
1339 static uschar
1340 ehlo_response(uschar * buf, uschar checks)
1341 {
1342 size_t bsize = Ustrlen(buf);
1343
1344 #ifdef SUPPORT_TLS
1345 if ( checks & OPTION_TLS
1346 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~OPTION_TLS;
1348 #endif
1349
1350 if ( checks & OPTION_IGNQ
1351 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1352 PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_IGNQ;
1354
1355 if ( checks & OPTION_CHUNKING
1356 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~OPTION_CHUNKING;
1358
1359 #ifndef DISABLE_PRDR
1360 if ( checks & OPTION_PRDR
1361 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_PRDR;
1363 #endif
1364
1365 #ifdef SUPPORT_I18N
1366 if ( checks & OPTION_UTF8
1367 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1368 checks &= ~OPTION_UTF8;
1369 #endif
1370
1371 if ( checks & OPTION_DSN
1372 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1373 checks &= ~OPTION_DSN;
1374
1375 if ( checks & OPTION_PIPE
1376 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1377 PCRE_EOPT, NULL, 0) < 0)
1378 checks &= ~OPTION_PIPE;
1379
1380 if ( checks & OPTION_SIZE
1381 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1382 checks &= ~OPTION_SIZE;
1383
1384 return checks;
1385 }
1386
1387
1388
1389 /* Callback for emitting a BDAT data chunk header.
1390
1391 If given a nonzero size, first flush any buffered SMTP commands
1392 then emit the command.
1393
1394 Reap previous SMTP command responses if requested, and always reap
1395 the response from a previous BDAT command.
1396
1397 Args:
1398 tctx transport context
1399 chunk_size value for SMTP BDAT command
1400 flags
1401 tc_chunk_last add LAST option to SMTP BDAT command
1402 tc_reap_prev reap response to previous SMTP commands
1403
1404 Returns: OK or ERROR
1405 */
1406
1407 static int
1408 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1409 unsigned flags)
1410 {
1411 smtp_transport_options_block * ob =
1412 (smtp_transport_options_block *)(tctx->tblock->options_block);
1413 smtp_context * sx = tctx->smtp_context;
1414 int cmd_count = 0;
1415 int prev_cmd_count;
1416
1417 /* Write SMTP chunk header command. If not reaping responses, note that
1418 there may be more writes (like, the chunk data) done soon. */
1419
1420 if (chunk_size > 0)
1421 {
1422 if((cmd_count = smtp_write_command(&sx->outblock,
1423 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1424 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1425 ) < 0) return ERROR;
1426 if (flags & tc_chunk_last)
1427 data_command = string_copy(big_buffer); /* Save for later error message */
1428 }
1429
1430 prev_cmd_count = cmd_count += sx->cmd_count;
1431
1432 /* Reap responses for any previous, but not one we just emitted */
1433
1434 if (chunk_size > 0)
1435 prev_cmd_count--;
1436 if (sx->pending_BDAT)
1437 prev_cmd_count--;
1438
1439 if (flags & tc_reap_prev && prev_cmd_count > 0)
1440 {
1441 DEBUG(D_transport) debug_printf("look for %d responses"
1442 " for previous pipelined cmds\n", prev_cmd_count);
1443
1444 switch(sync_responses(sx, prev_cmd_count, 0))
1445 {
1446 case 1: /* 2xx (only) => OK */
1447 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1448 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1449 case 0: break; /* No 2xx or 5xx, but no probs */
1450
1451 case -1: /* Timeout on RCPT */
1452 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1453 }
1454 cmd_count = 1;
1455 if (!sx->pending_BDAT)
1456 pipelining_active = FALSE;
1457 }
1458
1459 /* Reap response for an outstanding BDAT */
1460
1461 if (sx->pending_BDAT)
1462 {
1463 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1464
1465 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1466 ob->command_timeout))
1467 {
1468 if (errno == 0 && sx->buffer[0] == '4')
1469 {
1470 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1471 sx->addrlist->more_errno |=
1472 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1473 }
1474 return ERROR;
1475 }
1476 cmd_count--;
1477 sx->pending_BDAT = FALSE;
1478 pipelining_active = FALSE;
1479 }
1480 else if (chunk_size > 0)
1481 sx->pending_BDAT = TRUE;
1482
1483
1484 sx->cmd_count = cmd_count;
1485 return OK;
1486 }
1487
1488
1489
1490 /*************************************************
1491 * Make connection for given message *
1492 *************************************************/
1493
1494 /*
1495 Arguments:
1496 ctx connection context
1497 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1498 a second attempt after TLS initialization fails
1499
1500 Returns: OK - the connection was made and the delivery attempted;
1501 fd is set in the conn context, tls_out set up.
1502 DEFER - the connection could not be made, or something failed
1503 while setting up the SMTP session, or there was a
1504 non-message-specific error, such as a timeout.
1505 ERROR - helo_data or add_headers or authenticated_sender is
1506 specified for this transport, and the string failed
1507 to expand
1508 */
1509 int
1510 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1511 {
1512 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1513 dns_answer tlsa_dnsa;
1514 #endif
1515 BOOL pass_message = FALSE;
1516 uschar * message = NULL;
1517 int yield = OK;
1518 int rc;
1519
1520 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1521
1522 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1523 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1524 sx->ok = FALSE;
1525 sx->send_rset = TRUE;
1526 sx->send_quit = TRUE;
1527 sx->setting_up = TRUE;
1528 sx->esmtp = TRUE;
1529 sx->esmtp_sent = FALSE;
1530 #ifdef SUPPORT_I18N
1531 sx->utf8_needed = FALSE;
1532 #endif
1533 sx->dsn_all_lasthop = TRUE;
1534 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1535 sx->dane = FALSE;
1536 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1537 #endif
1538
1539 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1540 sx->peer_offered = 0;
1541 sx->avoid_option = 0;
1542 sx->igquotstr = US"";
1543 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1544 #ifdef EXPERIMENTAL_DSN_INFO
1545 sx->smtp_greeting = NULL;
1546 sx->helo_response = NULL;
1547 #endif
1548
1549 smtp_command = US"initial connection";
1550 sx->buffer[0] = '\0';
1551
1552 /* Set up the buffer for reading SMTP response packets. */
1553
1554 sx->inblock.buffer = sx->inbuffer;
1555 sx->inblock.buffersize = sizeof(sx->inbuffer);
1556 sx->inblock.ptr = sx->inbuffer;
1557 sx->inblock.ptrend = sx->inbuffer;
1558
1559 /* Set up the buffer for holding SMTP commands while pipelining */
1560
1561 sx->outblock.buffer = sx->outbuffer;
1562 sx->outblock.buffersize = sizeof(sx->outbuffer);
1563 sx->outblock.ptr = sx->outbuffer;
1564 sx->outblock.cmd_count = 0;
1565 sx->outblock.authenticating = FALSE;
1566
1567 /* Reset the parameters of a TLS session. */
1568
1569 tls_out.bits = 0;
1570 tls_out.cipher = NULL; /* the one we may use for this transport */
1571 tls_out.ourcert = NULL;
1572 tls_out.peercert = NULL;
1573 tls_out.peerdn = NULL;
1574 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1575 tls_out.sni = NULL;
1576 #endif
1577 tls_out.ocsp = OCSP_NOT_REQ;
1578
1579 /* Flip the legacy TLS-related variables over to the outbound set in case
1580 they're used in the context of the transport. Don't bother resetting
1581 afterward (when being used by a transport) as we're in a subprocess.
1582 For verify, unflipped once the callout is dealt with */
1583
1584 tls_modify_variables(&tls_out);
1585
1586 #ifndef SUPPORT_TLS
1587 if (sx->smtps)
1588 {
1589 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1590 DEFER, FALSE);
1591 return ERROR;
1592 }
1593 #endif
1594
1595 /* Make a connection to the host if this isn't a continued delivery, and handle
1596 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1597 specially so they can be identified for retries. */
1598
1599 if (!continue_hostname)
1600 {
1601 if (sx->verify)
1602 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1603
1604 /* Get the actual port the connection will use, into sx->host */
1605
1606 smtp_port_for_connect(sx->host, sx->port);
1607
1608 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1609 /* Do TLSA lookup for DANE */
1610 {
1611 tls_out.dane_verified = FALSE;
1612 tls_out.tlsa_usage = 0;
1613
1614 if (sx->host->dnssec == DS_YES)
1615 {
1616 if( sx->dane_required
1617 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1618 )
1619 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1620 {
1621 case OK: sx->dane = TRUE;
1622 sx->ob->tls_tempfail_tryclear = FALSE;
1623 break;
1624 case FAIL_FORCED: break;
1625 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1626 string_sprintf("DANE error: tlsa lookup %s",
1627 rc == DEFER ? "DEFER" : "FAIL"),
1628 rc, FALSE);
1629 (void) event_raise(sx->tblock->event_action,
1630 US"dane:fail", sx->dane_required
1631 ? US"dane-required" : US"dnssec-invalid");
1632 return rc;
1633 }
1634 }
1635 else if (sx->dane_required)
1636 {
1637 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1638 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1639 FAIL, FALSE);
1640 (void) event_raise(sx->tblock->event_action,
1641 US"dane:fail", US"dane-required");
1642 return FAIL;
1643 }
1644 }
1645 #endif /*DANE*/
1646
1647 /* Make the TCP connection */
1648
1649 sx->cctx.sock =
1650 smtp_connect(sx->host, sx->host_af, sx->interface,
1651 sx->ob->connect_timeout, sx->tblock);
1652 sx->cctx.tls_ctx = NULL;
1653 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1654
1655 if (sx->cctx.sock < 0)
1656 {
1657 uschar * msg = NULL;
1658 if (sx->verify)
1659 {
1660 msg = US strerror(errno);
1661 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1662 }
1663 set_errno_nohost(sx->addrlist,
1664 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1665 sx->verify ? string_sprintf("could not connect: %s", msg)
1666 : NULL,
1667 DEFER, FALSE);
1668 sx->send_quit = FALSE;
1669 return DEFER;
1670 }
1671
1672 /* Expand the greeting message while waiting for the initial response. (Makes
1673 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1674 delayed till here so that $sending_interface and $sending_port are set. */
1675
1676 if (sx->helo_data)
1677 if (!(sx->helo_data = expand_string(sx->helo_data)))
1678 if (sx->verify)
1679 log_write(0, LOG_MAIN|LOG_PANIC,
1680 "<%s>: failed to expand transport's helo_data value for callout: %s",
1681 sx->addrlist->address, expand_string_message);
1682
1683 #ifdef SUPPORT_I18N
1684 if (sx->helo_data)
1685 {
1686 expand_string_message = NULL;
1687 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1688 &expand_string_message)),
1689 expand_string_message)
1690 if (sx->verify)
1691 log_write(0, LOG_MAIN|LOG_PANIC,
1692 "<%s>: failed to expand transport's helo_data value for callout: %s",
1693 sx->addrlist->address, expand_string_message);
1694 else
1695 sx->helo_data = NULL;
1696 }
1697 #endif
1698
1699 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1700 is nevertheless a reasonably clean way of programming this kind of logic,
1701 where you want to escape on any error. */
1702
1703 if (!sx->smtps)
1704 {
1705 BOOL good_response;
1706
1707 #ifdef TCP_QUICKACK
1708 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1709 #endif
1710 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1711 '2', sx->ob->command_timeout);
1712 #ifdef EXPERIMENTAL_DSN_INFO
1713 sx->smtp_greeting = string_copy(sx->buffer);
1714 #endif
1715 if (!good_response) goto RESPONSE_FAILED;
1716
1717 #ifndef DISABLE_EVENT
1718 {
1719 uschar * s;
1720 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1721 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1722 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1723 if (s)
1724 {
1725 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1726 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1727 DEFER, FALSE);
1728 yield = DEFER;
1729 goto SEND_QUIT;
1730 }
1731 }
1732 #endif
1733
1734 /* Now check if the helo_data expansion went well, and sign off cleanly if
1735 it didn't. */
1736
1737 if (!sx->helo_data)
1738 {
1739 message = string_sprintf("failed to expand helo_data: %s",
1740 expand_string_message);
1741 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1742 yield = DEFER;
1743 goto SEND_QUIT;
1744 }
1745 }
1746
1747 /** Debugging without sending a message
1748 sx->addrlist->transport_return = DEFER;
1749 goto SEND_QUIT;
1750 **/
1751
1752 /* Errors that occur after this point follow an SMTP command, which is
1753 left in big_buffer by smtp_write_command() for use in error messages. */
1754
1755 smtp_command = big_buffer;
1756
1757 /* Tell the remote who we are...
1758
1759 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1760 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1761 greeting is of this form. The assumption was that the far end supports it
1762 properly... but experience shows that there are some that give 5xx responses,
1763 even though the banner includes "ESMTP" (there's a bloody-minded one that
1764 says "ESMTP not spoken here"). Cope with that case.
1765
1766 September 2000: Time has passed, and it seems reasonable now to always send
1767 EHLO at the start. It is also convenient to make the change while installing
1768 the TLS stuff.
1769
1770 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1771 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1772 would be no way to send out the mails, so there is now a host list
1773 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1774 PIPELINING problem as well. Maybe it can also be useful to cure other
1775 problems with broken servers.
1776
1777 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1778 Then somebody tried it with a Microsoft mailer... It seems that all other
1779 mailers use upper case for some reason (the RFC is quite clear about case
1780 independence) so, for peace of mind, I gave in. */
1781
1782 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1783
1784 /* Alas; be careful, since this goto is not an error-out, so conceivably
1785 we might set data between here and the target which we assume to exist
1786 and be usable. I can see this coming back to bite us. */
1787 #ifdef SUPPORT_TLS
1788 if (sx->smtps)
1789 {
1790 smtp_peer_options |= OPTION_TLS;
1791 suppress_tls = FALSE;
1792 sx->ob->tls_tempfail_tryclear = FALSE;
1793 smtp_command = US"SSL-on-connect";
1794 goto TLS_NEGOTIATE;
1795 }
1796 #endif
1797
1798 if (sx->esmtp)
1799 {
1800 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1801 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1802 goto SEND_FAILED;
1803 sx->esmtp_sent = TRUE;
1804 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1805 sx->ob->command_timeout))
1806 {
1807 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1808 {
1809 #ifdef EXPERIMENTAL_DSN_INFO
1810 sx->helo_response = string_copy(sx->buffer);
1811 #endif
1812 goto RESPONSE_FAILED;
1813 }
1814 sx->esmtp = FALSE;
1815 }
1816 #ifdef EXPERIMENTAL_DSN_INFO
1817 sx->helo_response = string_copy(sx->buffer);
1818 #endif
1819 }
1820 else
1821 DEBUG(D_transport)
1822 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1823
1824 if (!sx->esmtp)
1825 {
1826 BOOL good_response;
1827 int n = sizeof(sx->buffer);
1828 uschar * rsp = sx->buffer;
1829
1830 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1831 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1832
1833 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1834 goto SEND_FAILED;
1835 good_response = smtp_read_response(&sx->inblock, rsp, n,
1836 '2', sx->ob->command_timeout);
1837 #ifdef EXPERIMENTAL_DSN_INFO
1838 sx->helo_response = string_copy(rsp);
1839 #endif
1840 if (!good_response)
1841 {
1842 /* Handle special logging for a closed connection after HELO
1843 when had previously sent EHLO */
1844
1845 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1846 {
1847 errno = ERRNO_SMTPCLOSED;
1848 goto EHLOHELO_FAILED;
1849 }
1850 memmove(sx->buffer, rsp, Ustrlen(rsp));
1851 goto RESPONSE_FAILED;
1852 }
1853 }
1854
1855 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1856
1857 if (sx->esmtp || sx->lmtp)
1858 {
1859 sx->peer_offered = ehlo_response(sx->buffer,
1860 OPTION_TLS /* others checked later */
1861 );
1862
1863 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1864
1865 #ifdef SUPPORT_TLS
1866 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1867 #endif
1868 }
1869 }
1870
1871 /* For continuing deliveries down the same channel, having re-exec'd the socket
1872 is the standard input; for a socket held open from verify it is recorded
1873 in the cutthrough context block. Either way we don't need to redo EHLO here
1874 (but may need to do so for TLS - see below).
1875 Set up the pointer to where subsequent commands will be left, for
1876 error messages. Note that smtp_peer_options will have been
1877 set from the command line if they were set in the process that passed the
1878 connection on. */
1879
1880 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1881 as the continue goes via transport_pass_socket() and doublefork and exec.
1882 It does not wait. Unclear how we keep separate host's responses
1883 separate - we could match up by host ip+port as a bodge. */
1884
1885 else
1886 {
1887 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
1888 {
1889 sx->cctx = cutthrough.cctx;
1890 sx->host->port = sx->port = cutthrough.host.port;
1891 }
1892 else
1893 {
1894 sx->cctx.sock = 0; /* stdin */
1895 sx->cctx.tls_ctx = NULL;
1896 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1897 }
1898 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1899 smtp_command = big_buffer;
1900 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1901
1902 /* For a continued connection with TLS being proxied for us, or a
1903 held-open verify connection with TLS, nothing more to do. */
1904
1905 if ( continue_proxy_cipher
1906 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
1907 && cutthrough.is_tls)
1908 )
1909 {
1910 sx->peer_offered = smtp_peer_options;
1911 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1912 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1913 continue_proxy_cipher ? "proxied" : "verify conn with");
1914 return OK;
1915 }
1916 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1917 }
1918
1919 /* If TLS is available on this connection, whether continued or not, attempt to
1920 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1921 send another EHLO - the server may give a different answer in secure mode. We
1922 use a separate buffer for reading the response to STARTTLS so that if it is
1923 negative, the original EHLO data is available for subsequent analysis, should
1924 the client not be required to use TLS. If the response is bad, copy the buffer
1925 for error analysis. */
1926
1927 #ifdef SUPPORT_TLS
1928 if ( smtp_peer_options & OPTION_TLS
1929 && !suppress_tls
1930 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1931 && ( !sx->verify
1932 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1933 ) )
1934 {
1935 uschar buffer2[4096];
1936 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1937 goto SEND_FAILED;
1938
1939 /* If there is an I/O error, transmission of this message is deferred. If
1940 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1941 false, we also defer. However, if there is a temporary rejection of STARTTLS
1942 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1943 STARTTLS, we carry on. This means we will try to send the message in clear,
1944 unless the host is in hosts_require_tls (tested below). */
1945
1946 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1947 sx->ob->command_timeout))
1948 {
1949 if ( errno != 0
1950 || buffer2[0] == 0
1951 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1952 )
1953 {
1954 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1955 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1956 goto RESPONSE_FAILED;
1957 }
1958 }
1959
1960 /* STARTTLS accepted: try to negotiate a TLS session. */
1961
1962 else
1963 TLS_NEGOTIATE:
1964 {
1965 address_item * addr;
1966 uschar * errstr;
1967 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->host,
1968 sx->addrlist, sx->tblock,
1969 # ifdef SUPPORT_DANE
1970 sx->dane ? &tlsa_dnsa : NULL,
1971 # endif
1972 &tls_out, &errstr);
1973
1974 if (!sx->cctx.tls_ctx)
1975 {
1976 /* TLS negotiation failed; give an error. From outside, this function may
1977 be called again to try in clear on a new connection, if the options permit
1978 it for this host. */
1979
1980 # ifdef SUPPORT_DANE
1981 if (sx->dane)
1982 {
1983 log_write(0, LOG_MAIN,
1984 "DANE attempt failed; TLS connection to %s [%s]: %s",
1985 sx->host->name, sx->host->address, errstr);
1986 (void) event_raise(sx->tblock->event_action,
1987 US"dane:fail", US"validation-failure"); /* could do with better detail */
1988 }
1989 # endif
1990
1991 errno = ERRNO_TLSFAILURE;
1992 message = string_sprintf("TLS session: %s", errstr);
1993 sx->send_quit = FALSE;
1994 goto TLS_FAILED;
1995 }
1996
1997 /* TLS session is set up */
1998
1999 smtp_peer_options_wrap = smtp_peer_options;
2000 for (addr = sx->addrlist; addr; addr = addr->next)
2001 if (addr->transport_return == PENDING_DEFER)
2002 {
2003 addr->cipher = tls_out.cipher;
2004 addr->ourcert = tls_out.ourcert;
2005 addr->peercert = tls_out.peercert;
2006 addr->peerdn = tls_out.peerdn;
2007 addr->ocsp = tls_out.ocsp;
2008 }
2009 }
2010 }
2011
2012 /* if smtps, we'll have smtp_command set to something else; always safe to
2013 reset it here. */
2014 smtp_command = big_buffer;
2015
2016 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2017 helo_data is null, we are dealing with a connection that was passed from
2018 another process, and so we won't have expanded helo_data above. We have to
2019 expand it here. $sending_ip_address and $sending_port are set up right at the
2020 start of the Exim process (in exim.c). */
2021
2022 if (tls_out.active.sock >= 0)
2023 {
2024 char *greeting_cmd;
2025 BOOL good_response;
2026
2027 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2028 {
2029 uschar *message = string_sprintf("failed to expand helo_data: %s",
2030 expand_string_message);
2031 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2032 yield = DEFER;
2033 goto SEND_QUIT;
2034 }
2035
2036 /* For SMTPS we need to wait for the initial OK response. */
2037 if (sx->smtps)
2038 {
2039 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2040 '2', sx->ob->command_timeout);
2041 #ifdef EXPERIMENTAL_DSN_INFO
2042 sx->smtp_greeting = string_copy(sx->buffer);
2043 #endif
2044 if (!good_response) goto RESPONSE_FAILED;
2045 }
2046
2047 if (sx->esmtp)
2048 greeting_cmd = "EHLO";
2049 else
2050 {
2051 greeting_cmd = "HELO";
2052 DEBUG(D_transport)
2053 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2054 }
2055
2056 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2057 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2058 goto SEND_FAILED;
2059 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2060 '2', sx->ob->command_timeout);
2061 #ifdef EXPERIMENTAL_DSN_INFO
2062 sx->helo_response = string_copy(sx->buffer);
2063 #endif
2064 if (!good_response) goto RESPONSE_FAILED;
2065 smtp_peer_options = 0;
2066 }
2067
2068 /* If the host is required to use a secure channel, ensure that we
2069 have one. */
2070
2071 else if ( sx->smtps
2072 # ifdef SUPPORT_DANE
2073 || sx->dane
2074 # endif
2075 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2076 )
2077 {
2078 errno = ERRNO_TLSREQUIRED;
2079 message = string_sprintf("a TLS session is required, but %s",
2080 smtp_peer_options & OPTION_TLS
2081 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2082 # ifdef SUPPORT_DANE
2083 if (sx->dane)
2084 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2085 smtp_peer_options & OPTION_TLS
2086 ? US"validation-failure" /* could do with better detail */
2087 : US"starttls-not-supported");
2088 # endif
2089 goto TLS_FAILED;
2090 }
2091 #endif /*SUPPORT_TLS*/
2092
2093 /* If TLS is active, we have just started it up and re-done the EHLO command,
2094 so its response needs to be analyzed. If TLS is not active and this is a
2095 continued session down a previously-used socket, we haven't just done EHLO, so
2096 we skip this. */
2097
2098 if (continue_hostname == NULL
2099 #ifdef SUPPORT_TLS
2100 || tls_out.active.sock >= 0
2101 #endif
2102 )
2103 {
2104 if (sx->esmtp || sx->lmtp)
2105 {
2106 sx->peer_offered = ehlo_response(sx->buffer,
2107 0 /* no TLS */
2108 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2109 | OPTION_CHUNKING
2110 | OPTION_PRDR
2111 #ifdef SUPPORT_I18N
2112 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2113 /*XXX if we hand peercaps on to continued-conn processes,
2114 must not depend on this addr */
2115 #endif
2116 | OPTION_DSN
2117 | OPTION_PIPE
2118 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2119 );
2120
2121 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2122 lmtp_ignore_quota option was set. */
2123
2124 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2125
2126 /* If the response to EHLO specified support for the SIZE parameter, note
2127 this, provided size_addition is non-negative. */
2128
2129 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2130
2131 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2132 the current host, esmtp will be false, so PIPELINING can never be used. If
2133 the current host matches hosts_avoid_pipelining, don't do it. */
2134
2135 if ( sx->peer_offered & OPTION_PIPE
2136 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2137 smtp_peer_options |= OPTION_PIPE;
2138
2139 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2140 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2141
2142 if ( sx->peer_offered & OPTION_CHUNKING
2143 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2144 sx->peer_offered &= ~OPTION_CHUNKING;
2145
2146 if (sx->peer_offered & OPTION_CHUNKING)
2147 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2148
2149 #ifndef DISABLE_PRDR
2150 if ( sx->peer_offered & OPTION_PRDR
2151 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2152 sx->peer_offered &= ~OPTION_PRDR;
2153
2154 if (sx->peer_offered & OPTION_PRDR)
2155 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2156 #endif
2157
2158 /* Note if the server supports DSN */
2159 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2160 DEBUG(D_transport) debug_printf("%susing DSN\n",
2161 sx->peer_offered & OPTION_DSN ? "" : "not ");
2162
2163 /* Note if the response to EHLO specifies support for the AUTH extension.
2164 If it has, check that this host is one we want to authenticate to, and do
2165 the business. The host name and address must be available when the
2166 authenticator's client driver is running. */
2167
2168 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2169 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2170 {
2171 default: goto SEND_QUIT;
2172 case OK: break;
2173 case FAIL_SEND: goto SEND_FAILED;
2174 case FAIL: goto RESPONSE_FAILED;
2175 }
2176 }
2177 }
2178 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2179
2180 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2181 message-specific. */
2182
2183 sx->setting_up = FALSE;
2184
2185 #ifdef SUPPORT_I18N
2186 if (sx->addrlist->prop.utf8_msg)
2187 {
2188 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2189 && !sx->addrlist->prop.utf8_downcvt_maybe;
2190 DEBUG(D_transport) if (!sx->utf8_needed)
2191 debug_printf("utf8: %s downconvert\n",
2192 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2193 }
2194
2195 /* If this is an international message we need the host to speak SMTPUTF8 */
2196 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2197 {
2198 errno = ERRNO_UTF8_FWD;
2199 goto RESPONSE_FAILED;
2200 }
2201 #endif
2202
2203 return OK;
2204
2205
2206 {
2207 int code;
2208
2209 RESPONSE_FAILED:
2210 message = NULL;
2211 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2212 sx->buffer, &code, &message, &pass_message);
2213 goto FAILED;
2214
2215 SEND_FAILED:
2216 code = '4';
2217 message = US string_sprintf("send() to %s [%s] failed: %s",
2218 sx->host->name, sx->host->address, strerror(errno));
2219 sx->send_quit = FALSE;
2220 goto FAILED;
2221
2222 EHLOHELO_FAILED:
2223 code = '4';
2224 message = string_sprintf("Remote host closed connection in response to %s"
2225 " (EHLO response was: %s)", smtp_command, sx->buffer);
2226 sx->send_quit = FALSE;
2227 goto FAILED;
2228
2229 /* This label is jumped to directly when a TLS negotiation has failed,
2230 or was not done for a host for which it is required. Values will be set
2231 in message and errno, and setting_up will always be true. Treat as
2232 a temporary error. */
2233
2234 #ifdef SUPPORT_TLS
2235 TLS_FAILED:
2236 code = '4';
2237 goto FAILED;
2238 #endif
2239
2240 /* The failure happened while setting up the call; see if the failure was
2241 a 5xx response (this will either be on connection, or following HELO - a 5xx
2242 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2243 fail all addresses, as this host is never going to accept them. For other
2244 errors during setting up (timeouts or whatever), defer all addresses, and
2245 yield DEFER, so that the host is not tried again for a while.
2246
2247 XXX This peeking for another host feels like a layering violation. We want
2248 to note the host as unusable, but down here we shouldn't know if this was
2249 the last host to try for the addr(list). Perhaps the upper layer should be
2250 the one to do set_errno() ? The problem is that currently the addr is where
2251 errno etc. are stashed, but until we run out of hosts to try the errors are
2252 host-specific. Maybe we should enhance the host_item definition? */
2253
2254 FAILED:
2255 sx->ok = FALSE; /* For when reached by GOTO */
2256 set_errno(sx->addrlist, errno, message,
2257 sx->host->next
2258 ? DEFER
2259 : code == '5'
2260 #ifdef SUPPORT_I18N
2261 || errno == ERRNO_UTF8_FWD
2262 #endif
2263 ? FAIL : DEFER,
2264 pass_message, sx->host
2265 #ifdef EXPERIMENTAL_DSN_INFO
2266 , sx->smtp_greeting, sx->helo_response
2267 #endif
2268 );
2269 yield = DEFER;
2270 }
2271
2272
2273 SEND_QUIT:
2274
2275 if (sx->send_quit)
2276 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2277
2278 #ifdef SUPPORT_TLS
2279 if (sx->cctx.tls_ctx)
2280 {
2281 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2282 sx->cctx.tls_ctx = NULL;
2283 }
2284 #endif
2285
2286 /* Close the socket, and return the appropriate value, first setting
2287 works because the NULL setting is passed back to the calling process, and
2288 remote_max_parallel is forced to 1 when delivering over an existing connection,
2289 */
2290
2291 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2292 if (sx->send_quit)
2293 {
2294 shutdown(sx->cctx.sock, SHUT_WR);
2295 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2296 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2297 rc--; /* drain socket */
2298 sx->send_quit = FALSE;
2299 }
2300 (void)close(sx->cctx.sock);
2301 sx->cctx.sock = -1;
2302
2303 #ifndef DISABLE_EVENT
2304 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2305 #endif
2306
2307 continue_transport = NULL;
2308 continue_hostname = NULL;
2309 return yield;
2310 }
2311
2312
2313
2314
2315 /* Create the string of options that will be appended to the MAIL FROM:
2316 in the connection context buffer */
2317
2318 static int
2319 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2320 {
2321 uschar * p = sx->buffer;
2322 address_item * addr;
2323 int address_count;
2324
2325 *p = 0;
2326
2327 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2328 send it, adding something to the message size to allow for imprecision
2329 and things that get added en route. Exim keeps the number of lines
2330 in a message, so we can give an accurate value for the original message, but we
2331 need some additional to handle added headers. (Double "." characters don't get
2332 included in the count.) */
2333
2334 if ( message_size > 0
2335 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2336 {
2337 /*XXX problem here under spool_files_wireformat?
2338 Or just forget about lines? Or inflate by a fixed proportion? */
2339
2340 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2341 while (*p) p++;
2342 }
2343
2344 #ifndef DISABLE_PRDR
2345 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2346 request that */
2347
2348 sx->prdr_active = FALSE;
2349 if (sx->peer_offered & OPTION_PRDR)
2350 for (addr = addrlist; addr; addr = addr->next)
2351 if (addr->transport_return == PENDING_DEFER)
2352 {
2353 for (addr = addr->next; addr; addr = addr->next)
2354 if (addr->transport_return == PENDING_DEFER)
2355 { /* at least two recipients to send */
2356 sx->prdr_active = TRUE;
2357 sprintf(CS p, " PRDR"); p += 5;
2358 break;
2359 }
2360 break;
2361 }
2362 #endif
2363
2364 #ifdef SUPPORT_I18N
2365 /* If it supports internationalised messages, and this meesage need that,
2366 request it */
2367
2368 if ( sx->peer_offered & OPTION_UTF8
2369 && addrlist->prop.utf8_msg
2370 && !addrlist->prop.utf8_downcvt
2371 )
2372 Ustrcpy(p, " SMTPUTF8"), p += 9;
2373 #endif
2374
2375 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2376 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2377 addr && address_count < sx->max_rcpt;
2378 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2379 {
2380 address_count++;
2381 if (!(addr->dsn_flags & rf_dsnlasthop))
2382 {
2383 sx->dsn_all_lasthop = FALSE;
2384 break;
2385 }
2386 }
2387
2388 /* Add any DSN flags to the mail command */
2389
2390 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2391 {
2392 if (dsn_ret == dsn_ret_hdrs)
2393 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2394 else if (dsn_ret == dsn_ret_full)
2395 { Ustrcpy(p, " RET=FULL"); p += 9; }
2396
2397 if (dsn_envid)
2398 {
2399 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2400 while (*p) p++;
2401 }
2402 }
2403
2404 /* If an authenticated_sender override has been specified for this transport
2405 instance, expand it. If the expansion is forced to fail, and there was already
2406 an authenticated_sender for this message, the original value will be used.
2407 Other expansion failures are serious. An empty result is ignored, but there is
2408 otherwise no check - this feature is expected to be used with LMTP and other
2409 cases where non-standard addresses (e.g. without domains) might be required. */
2410
2411 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2412 return ERROR;
2413
2414 return OK;
2415 }
2416
2417
2418 static void
2419 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2420 {
2421 uschar * p = sx->buffer;
2422 *p = 0;
2423
2424 /* Add any DSN flags to the rcpt command */
2425
2426 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2427 {
2428 if (addr->dsn_flags & rf_dsnflags)
2429 {
2430 int i;
2431 BOOL first = TRUE;
2432
2433 Ustrcpy(p, " NOTIFY=");
2434 while (*p) p++;
2435 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2436 {
2437 if (!first) *p++ = ',';
2438 first = FALSE;
2439 Ustrcpy(p, rf_names[i]);
2440 while (*p) p++;
2441 }
2442 }
2443
2444 if (addr->dsn_orcpt)
2445 {
2446 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2447 addr->dsn_orcpt);
2448 while (*p) p++;
2449 }
2450 }
2451 }
2452
2453
2454
2455 /*
2456 Return:
2457 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2458 -1 MAIL response error
2459 -2 any non-MAIL read i/o error
2460 -3 non-MAIL response timeout
2461 -4 internal error; channel still usable
2462 -5 transmit failed
2463 */
2464
2465 int
2466 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2467 {
2468 address_item * addr;
2469 int address_count;
2470 int rc;
2471
2472 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2473 {
2474 *yield = ERROR;
2475 return -4;
2476 }
2477
2478 /* From here until we send the DATA command, we can make use of PIPELINING
2479 if the server host supports it. The code has to be able to check the responses
2480 at any point, for when the buffer fills up, so we write it totally generally.
2481 When PIPELINING is off, each command written reports that it has flushed the
2482 buffer. */
2483
2484 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2485
2486 {
2487 uschar * s = sx->from_addr;
2488 #ifdef SUPPORT_I18N
2489 uschar * errstr = NULL;
2490
2491 /* If we must downconvert, do the from-address here. Remember we had to
2492 for the to-addresses (done below), and also (ugly) for re-doing when building
2493 the delivery log line. */
2494
2495 if ( sx->addrlist->prop.utf8_msg
2496 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2497 )
2498 {
2499 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2500 {
2501 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2502 *yield = ERROR;
2503 return -4;
2504 }
2505 setflag(sx->addrlist, af_utf8_downcvt);
2506 }
2507 #endif
2508
2509 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2510 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2511 }
2512
2513 mail_command = string_copy(big_buffer); /* Save for later error message */
2514
2515 switch(rc)
2516 {
2517 case -1: /* Transmission error */
2518 return -5;
2519
2520 case +1: /* Cmd was sent */
2521 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2522 sx->ob->command_timeout))
2523 {
2524 if (errno == 0 && sx->buffer[0] == '4')
2525 {
2526 errno = ERRNO_MAIL4XX;
2527 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2528 }
2529 return -1;
2530 }
2531 sx->pending_MAIL = FALSE;
2532 break;
2533
2534 /* otherwise zero: command queued for pipeline */
2535 }
2536
2537 /* Pass over all the relevant recipient addresses for this host, which are the
2538 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2539 several before we have to read the responses for those seen so far. This
2540 checking is done by a subroutine because it also needs to be done at the end.
2541 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2542 the next one if not all are sent.
2543
2544 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2545 last address because we want to abort if any recipients have any kind of
2546 problem, temporary or permanent. We know that all recipient addresses will have
2547 the PENDING_DEFER status, because only one attempt is ever made, and we know
2548 that max_rcpt will be large, so all addresses will be done at once.
2549
2550 For verify we flush the pipeline after any (the only) rcpt address. */
2551
2552 for (addr = sx->first_addr, address_count = 0;
2553 addr && address_count < sx->max_rcpt;
2554 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2555 {
2556 int count;
2557 BOOL no_flush;
2558 uschar * rcpt_addr;
2559
2560 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2561 {
2562 setflag(addr, af_tcp_fastopen_conn);
2563 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2564 }
2565
2566 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2567 ? dsn_support_yes : dsn_support_no;
2568
2569 address_count++;
2570 no_flush = pipelining_active && !sx->verify
2571 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2572
2573 build_rcptcmd_options(sx, addr);
2574
2575 /* Now send the RCPT command, and process outstanding responses when
2576 necessary. After a timeout on RCPT, we just end the function, leaving the
2577 yield as OK, because this error can often mean that there is a problem with
2578 just one address, so we don't want to delay the host. */
2579
2580 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2581
2582 #ifdef SUPPORT_I18N
2583 if ( testflag(sx->addrlist, af_utf8_downcvt)
2584 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2585 )
2586 {
2587 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2588 errno = ERRNO_EXPANDFAIL;
2589 return -5; /*XXX too harsh? */
2590 }
2591 #endif
2592
2593 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2594 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2595
2596 if (count < 0) return -5;
2597 if (count > 0)
2598 {
2599 switch(sync_responses(sx, count, 0))
2600 {
2601 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2602 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2603 break;
2604
2605 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2606 if (!sx->lmtp) /* can't tell about progress yet */
2607 sx->completed_addr = TRUE;
2608 case 0: /* No 2xx or 5xx, but no probs */
2609 break;
2610
2611 case -1: return -3; /* Timeout on RCPT */
2612 case -2: return -2; /* non-MAIL read i/o error */
2613 default: return -1; /* any MAIL error */
2614 }
2615 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2616 }
2617 } /* Loop for next address */
2618
2619 tcp_out_fastopen_logged = TRUE;
2620 sx->next_addr = addr;
2621 return 0;
2622 }
2623
2624
2625 #ifdef SUPPORT_TLS
2626 /*****************************************************
2627 * Proxy TLS connection for another transport process *
2628 ******************************************************/
2629 /*
2630 Close the unused end of the pipe, fork once more, then use the given buffer
2631 as a staging area, and select on both the given fd and the TLS'd client-fd for
2632 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2633 Do blocking full-size writes, and reads under a timeout. Once both input
2634 channels are closed, exit the process.
2635
2636 Arguments:
2637 ct_ctx tls context
2638 buf space to use for buffering
2639 bufsiz size of buffer
2640 pfd pipe filedescriptor array; [0] is comms to proxied process
2641 timeout per-read timeout, seconds
2642 */
2643
2644 void
2645 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
2646 int timeout)
2647 {
2648 fd_set rfds, efds;
2649 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
2650 int rc, i, fd_bits, nbytes;
2651
2652 close(pfd[1]);
2653 if ((rc = fork()))
2654 {
2655 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2656 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2657 }
2658
2659 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2660 set_process_info("proxying TLS connection for continued transport");
2661 FD_ZERO(&rfds);
2662 FD_SET(tls_out.active.sock, &rfds);
2663 FD_SET(pfd[0], &rfds);
2664
2665 for (fd_bits = 3; fd_bits; )
2666 {
2667 time_t time_left = timeout;
2668 time_t time_start = time(NULL);
2669
2670 /* wait for data */
2671 efds = rfds;
2672 do
2673 {
2674 struct timeval tv = { time_left, 0 };
2675
2676 rc = select(max_fd,
2677 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2678
2679 if (rc < 0 && errno == EINTR)
2680 if ((time_left -= time(NULL) - time_start) > 0) continue;
2681
2682 if (rc <= 0)
2683 {
2684 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2685 goto done;
2686 }
2687
2688 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
2689 {
2690 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2691 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2692 goto done;
2693 }
2694 }
2695 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
2696
2697 /* handle inbound data */
2698 if (FD_ISSET(tls_out.active.sock, &rfds))
2699 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
2700 {
2701 fd_bits &= ~1;
2702 FD_CLR(tls_out.active.sock, &rfds);
2703 shutdown(pfd[0], SHUT_WR);
2704 timeout = 5;
2705 }
2706 else
2707 {
2708 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2709 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2710 }
2711 else if (fd_bits & 1)
2712 FD_SET(tls_out.active.sock, &rfds);
2713
2714 /* handle outbound data */
2715 if (FD_ISSET(pfd[0], &rfds))
2716 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2717 {
2718 fd_bits = 0;
2719 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
2720 }
2721 else
2722 {
2723 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2724 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
2725 goto done;
2726 }
2727 else if (fd_bits & 2)
2728 FD_SET(pfd[0], &rfds);
2729 }
2730
2731 done:
2732 if (running_in_test_harness) millisleep(100); /* let logging complete */
2733 exim_exit(0, US"TLS proxy");
2734 }
2735 #endif
2736
2737
2738 /*************************************************
2739 * Deliver address list to given host *
2740 *************************************************/
2741
2742 /* If continue_hostname is not null, we get here only when continuing to
2743 deliver down an existing channel. The channel was passed as the standard
2744 input. TLS is never active on a passed channel; the previous process always
2745 closes it down before passing the connection on.
2746
2747 Otherwise, we have to make a connection to the remote host, and do the
2748 initial protocol exchange.
2749
2750 When running as an MUA wrapper, if the sender or any recipient is rejected,
2751 temporarily or permanently, we force failure for all recipients.
2752
2753 Arguments:
2754 addrlist chain of potential addresses to deliver; only those whose
2755 transport_return field is set to PENDING_DEFER are currently
2756 being processed; others should be skipped - they have either
2757 been delivered to an earlier host or IP address, or been
2758 failed by one of them.
2759 host host to deliver to
2760 host_af AF_INET or AF_INET6
2761 defport default TCP/IP port to use if host does not specify, in host
2762 byte order
2763 interface interface to bind to, or NULL
2764 tblock transport instance block
2765 message_defer set TRUE if yield is OK, but all addresses were deferred
2766 because of a non-recipient, non-host failure, that is, a
2767 4xx response to MAIL FROM, DATA, or ".". This is a defer
2768 that is specific to the message.
2769 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2770 a second attempt after TLS initialization fails
2771
2772 Returns: OK - the connection was made and the delivery attempted;
2773 the result for each address is in its data block.
2774 DEFER - the connection could not be made, or something failed
2775 while setting up the SMTP session, or there was a
2776 non-message-specific error, such as a timeout.
2777 ERROR - a filter command is specified for this transport,
2778 and there was a problem setting it up; OR helo_data
2779 or add_headers or authenticated_sender is specified
2780 for this transport, and the string failed to expand
2781 */
2782
2783 static int
2784 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2785 uschar *interface, transport_instance *tblock,
2786 BOOL *message_defer, BOOL suppress_tls)
2787 {
2788 address_item *addr;
2789 int yield = OK;
2790 int save_errno;
2791 int rc;
2792 struct timeval start_delivery_time;
2793
2794 BOOL pass_message = FALSE;
2795 uschar *message = NULL;
2796 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2797
2798 smtp_context sx;
2799
2800 gettimeofday(&start_delivery_time, NULL);
2801 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2802 *message_defer = FALSE;
2803
2804 sx.addrlist = addrlist;
2805 sx.host = host;
2806 sx.host_af = host_af,
2807 sx.port = defport;
2808 sx.interface = interface;
2809 sx.helo_data = NULL;
2810 sx.tblock = tblock;
2811 sx.verify = FALSE;
2812
2813 /* Get the channel set up ready for a message (MAIL FROM being the next
2814 SMTP command to send */
2815
2816 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2817 return rc;
2818
2819 /* If there is a filter command specified for this transport, we can now
2820 set it up. This cannot be done until the identify of the host is known. */
2821
2822 if (tblock->filter_command)
2823 {
2824 transport_filter_timeout = tblock->filter_timeout;
2825
2826 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2827 yield ERROR. */
2828
2829 if (!transport_set_up_command(&transport_filter_argv,
2830 tblock->filter_command, TRUE, DEFER, addrlist,
2831 string_sprintf("%.50s transport", tblock->name), NULL))
2832 {
2833 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2834 FALSE);
2835 yield = ERROR;
2836 goto SEND_QUIT;
2837 }
2838
2839 if ( transport_filter_argv
2840 && *transport_filter_argv
2841 && **transport_filter_argv
2842 && sx.peer_offered & OPTION_CHUNKING
2843 )
2844 {
2845 sx.peer_offered &= ~OPTION_CHUNKING;
2846 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2847 }
2848 }
2849
2850 sx.first_addr = addrlist;
2851
2852 /* For messages that have more than the maximum number of envelope recipients,
2853 we want to send several transactions down the same SMTP connection. (See
2854 comments in deliver.c as to how this reconciles, heuristically, with
2855 remote_max_parallel.) This optimization was added to Exim after the following
2856 code was already working. The simplest way to put it in without disturbing the
2857 code was to use a goto to jump back to this point when there is another
2858 transaction to handle. */
2859
2860 SEND_MESSAGE:
2861 sx.from_addr = return_path;
2862 sx.sync_addr = sx.first_addr;
2863 sx.ok = FALSE;
2864 sx.send_rset = TRUE;
2865 sx.completed_addr = FALSE;
2866
2867
2868 /* If we are a continued-connection-after-verify the MAIL and RCPT
2869 commands were already sent; do not re-send but do mark the addrs as
2870 having been accepted up to RCPT stage. A traditional cont-conn
2871 always has a sequence number greater than one. */
2872
2873 if (continue_hostname && continue_sequence == 1)
2874 {
2875 address_item * addr;
2876
2877 sx.peer_offered = smtp_peer_options;
2878 sx.pending_MAIL = FALSE;
2879 sx.ok = TRUE;
2880 sx.next_addr = NULL;
2881
2882 for (addr = addrlist; addr; addr = addr->next)
2883 addr->transport_return = PENDING_OK;
2884 }
2885 else
2886 {
2887 /* Initiate a message transfer. */
2888
2889 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2890 {
2891 case 0: break;
2892 case -1: case -2: goto RESPONSE_FAILED;
2893 case -3: goto END_OFF;
2894 case -4: goto SEND_QUIT;
2895 default: goto SEND_FAILED;
2896 }
2897
2898 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2899 permanently or temporarily. We should have flushed and synced after the last
2900 RCPT. */
2901
2902 if (mua_wrapper)
2903 {
2904 address_item * a;
2905 unsigned cnt;
2906
2907 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2908 if (a->transport_return != PENDING_OK)
2909 {
2910 /*XXX could we find a better errno than 0 here? */
2911 set_errno_nohost(addrlist, 0, a->message, FAIL,
2912 testflag(a, af_pass_message));
2913 sx.ok = FALSE;
2914 break;
2915 }
2916 }
2917 }
2918
2919 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2920 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2921 have a good recipient buffered up if we are pipelining. We don't want to waste
2922 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2923 are pipelining. The responses are all handled by sync_responses().
2924 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2925 to send is. */
2926
2927 if ( !(sx.peer_offered & OPTION_CHUNKING)
2928 && (sx.ok || (pipelining_active && !mua_wrapper)))
2929 {
2930 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2931
2932 if (count < 0) goto SEND_FAILED;
2933 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2934 {
2935 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2936 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2937 break;
2938
2939 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2940 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2941 case 0: break; /* No 2xx or 5xx, but no probs */
2942
2943 case -1: goto END_OFF; /* Timeout on RCPT */
2944 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2945 }
2946 pipelining_active = FALSE;
2947 data_command = string_copy(big_buffer); /* Save for later error message */
2948 }
2949
2950 /* If there were no good recipients (but otherwise there have been no
2951 problems), just set ok TRUE, since we have handled address-specific errors
2952 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2953 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2954 well as body. Set the appropriate timeout value to be used for each chunk.
2955 (Haven't been able to make it work using select() for writing yet.) */
2956
2957 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2958 {
2959 /* Save the first address of the next batch. */
2960 sx.first_addr = sx.next_addr;
2961
2962 sx.ok = TRUE;
2963 }
2964 else
2965 {
2966 transport_ctx tctx = {
2967 {sx.cctx.sock}, /*XXX will this need TLS info? */
2968 tblock,
2969 addrlist,
2970 US".", US"..", /* Escaping strings */
2971 topt_use_crlf | topt_escape_headers
2972 | (tblock->body_only ? topt_no_headers : 0)
2973 | (tblock->headers_only ? topt_no_body : 0)
2974 | (tblock->return_path_add ? topt_add_return_path : 0)
2975 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2976 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2977 };
2978
2979 /* If using CHUNKING we need a callback from the generic transport
2980 support to us, for the sending of BDAT smtp commands and the reaping
2981 of responses. The callback needs a whole bunch of state so set up
2982 a transport-context structure to be passed around. */
2983
2984 if (sx.peer_offered & OPTION_CHUNKING)
2985 {
2986 tctx.check_string = tctx.escape_string = NULL;
2987 tctx.options |= topt_use_bdat;
2988 tctx.chunk_cb = smtp_chunk_cmd_callback;
2989 sx.pending_BDAT = FALSE;
2990 sx.good_RCPT = sx.ok;
2991 sx.cmd_count = 0;
2992 tctx.smtp_context = &sx;
2993 }
2994 else
2995 tctx.options |= topt_end_dot;
2996
2997 /* Save the first address of the next batch. */
2998 sx.first_addr = sx.next_addr;
2999
3000 /* Responses from CHUNKING commands go in buffer. Otherwise,
3001 there has not been a response. */
3002
3003 sx.buffer[0] = 0;
3004
3005 sigalrm_seen = FALSE;
3006 transport_write_timeout = sx.ob->data_timeout;
3007 smtp_command = US"sending data block"; /* For error messages */
3008 DEBUG(D_transport|D_v)
3009 if (sx.peer_offered & OPTION_CHUNKING)
3010 debug_printf(" will write message using CHUNKING\n");
3011 else
3012 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3013 transport_count = 0;
3014
3015 #ifndef DISABLE_DKIM
3016 dkim_exim_sign_init();
3017 # ifdef EXPERIMENTAL_ARC
3018 {
3019 uschar * s = sx.ob->arc_sign;
3020 if (s)
3021 {
3022 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3023 {
3024 if (!expand_string_forcedfail)
3025 {
3026 message = US"failed to expand arc_sign";
3027 sx.ok = FALSE;
3028 goto SEND_FAILED;
3029 }
3030 }
3031 else if (*s)
3032 {
3033 /* Ask dkim code to hash the body for ARC */
3034 (void) arc_ams_setup_sign_bodyhash();
3035 sx.ob->dkim.force_bodyhash = TRUE;
3036 }
3037 }
3038 }
3039 # endif
3040 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3041 #else
3042 sx.ok = transport_write_message(&tctx, 0);
3043 #endif
3044
3045 /* transport_write_message() uses write() because it is called from other
3046 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3047 it can exit with "Broken pipe" as its error. This really means that the
3048 socket got closed at the far end. */
3049
3050 transport_write_timeout = 0; /* for subsequent transports */
3051
3052 /* Failure can either be some kind of I/O disaster (including timeout),
3053 or the failure of a transport filter or the expansion of added headers.
3054 Or, when CHUNKING, it can be a protocol-detected failure. */
3055
3056 if (!sx.ok)
3057 if (message) goto SEND_FAILED;
3058 else goto RESPONSE_FAILED;
3059
3060 /* We used to send the terminating "." explicitly here, but because of
3061 buffering effects at both ends of TCP/IP connections, you don't gain
3062 anything by keeping it separate, so it might as well go in the final
3063 data buffer for efficiency. This is now done by setting the topt_end_dot
3064 flag above. */
3065
3066 smtp_command = US"end of data";
3067
3068 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3069 {
3070 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3071 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3072 {
3073 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3074 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3075 break;
3076
3077 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3078 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3079 case 0: break; /* No 2xx or 5xx, but no probs */
3080
3081 case -1: goto END_OFF; /* Timeout on RCPT */
3082 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3083 }
3084 }
3085
3086 #ifndef DISABLE_PRDR
3087 /* For PRDR we optionally get a partial-responses warning
3088 * followed by the individual responses, before going on with
3089 * the overall response. If we don't get the warning then deal
3090 * with per non-PRDR. */
3091 if(sx.prdr_active)
3092 {
3093 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3094 sx.ob->final_timeout);
3095 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3096 {
3097 case '2': sx.prdr_active = FALSE;
3098 sx.ok = TRUE;
3099 break;
3100 case '4': errno = ERRNO_DATA4XX;
3101 addrlist->more_errno |=
3102 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3103 break;
3104 }
3105 }
3106 else
3107 #endif
3108
3109 /* For non-PRDR SMTP, we now read a single response that applies to the
3110 whole message. If it is OK, then all the addresses have been delivered. */
3111
3112 if (!sx.lmtp)
3113 {
3114 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3115 sx.ob->final_timeout);
3116 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3117 {
3118 errno = ERRNO_DATA4XX;
3119 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3120 }
3121 }
3122
3123 /* For LMTP, we get back a response for every RCPT command that we sent;
3124 some may be accepted and some rejected. For those that get a response, their
3125 status is fixed; any that are accepted have been handed over, even if later
3126 responses crash - at least, that's how I read RFC 2033.
3127
3128 If all went well, mark the recipient addresses as completed, record which
3129 host/IPaddress they were delivered to, and cut out RSET when sending another
3130 message down the same channel. Write the completed addresses to the journal
3131 now so that they are recorded in case there is a crash of hardware or
3132 software before the spool gets updated. Also record the final SMTP
3133 confirmation if needed (for SMTP only). */
3134
3135 if (sx.ok)
3136 {
3137 int flag = '=';
3138 struct timeval delivery_time;
3139 int len;
3140 uschar * conf = NULL;
3141
3142 timesince(&delivery_time, &start_delivery_time);
3143 sx.send_rset = FALSE;
3144 pipelining_active = FALSE;
3145
3146 /* Set up confirmation if needed - applies only to SMTP */
3147
3148 if (
3149 #ifdef DISABLE_EVENT
3150 LOGGING(smtp_confirmation) &&
3151 #endif
3152 !sx.lmtp
3153 )
3154 {
3155 const uschar *s = string_printing(sx.buffer);
3156 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3157 conf = (s == sx.buffer)? US string_copy(s) : US s;
3158 }
3159
3160 /* Process all transported addresses - for LMTP or PRDR, read a status for
3161 each one. */
3162
3163 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3164 {
3165 if (addr->transport_return != PENDING_OK) continue;
3166
3167 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3168 remaining addresses. Otherwise, it's a return code for just the one
3169 address. For temporary errors, add a retry item for the address so that
3170 it doesn't get tried again too soon. */
3171
3172 #ifndef DISABLE_PRDR
3173 if (sx.lmtp || sx.prdr_active)
3174 #else
3175 if (sx.lmtp)
3176 #endif
3177 {
3178 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3179 sx.ob->final_timeout))
3180 {
3181 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3182 addr->message = string_sprintf(
3183 #ifndef DISABLE_PRDR
3184 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3185 #else
3186 "LMTP error after %s: %s",
3187 #endif
3188 data_command, string_printing(sx.buffer));
3189 setflag(addr, af_pass_message); /* Allow message to go to user */
3190 if (sx.buffer[0] == '5')
3191 addr->transport_return = FAIL;
3192 else
3193 {
3194 errno = ERRNO_DATA4XX;
3195 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3196 addr->transport_return = DEFER;
3197 #ifndef DISABLE_PRDR
3198 if (!sx.prdr_active)
3199 #endif
3200 retry_add_item(addr, addr->address_retry_key, 0);
3201 }
3202 continue;
3203 }
3204 sx.completed_addr = TRUE; /* NOW we can set this flag */
3205 if (LOGGING(smtp_confirmation))
3206 {
3207 const uschar *s = string_printing(sx.buffer);
3208 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3209 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3210 }
3211 }
3212
3213 /* SMTP, or success return from LMTP for this address. Pass back the
3214 actual host that was used. */
3215
3216 addr->transport_return = OK;
3217 addr->more_errno = delivery_time.tv_sec;
3218 addr->delivery_usec = delivery_time.tv_usec;
3219 addr->host_used = host;
3220 addr->special_action = flag;
3221 addr->message = conf;
3222 #ifndef DISABLE_PRDR
3223 if (sx.prdr_active) setflag(addr, af_prdr_used);
3224 #endif
3225 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3226 flag = '-';
3227
3228 #ifndef DISABLE_PRDR
3229 if (!sx.prdr_active)
3230 #endif
3231 {
3232 /* Update the journal. For homonymic addresses, use the base address plus
3233 the transport name. See lots of comments in deliver.c about the reasons
3234 for the complications when homonyms are involved. Just carry on after
3235 write error, as it may prove possible to update the spool file later. */
3236
3237 if (testflag(addr, af_homonym))
3238 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3239 else
3240 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3241
3242 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3243 len = Ustrlen(CS sx.buffer);
3244 if (write(journal_fd, sx.buffer, len) != len)
3245 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3246 "%s: %s", sx.buffer, strerror(errno));
3247 }
3248 }
3249
3250 #ifndef DISABLE_PRDR
3251 if (sx.prdr_active)
3252 {
3253 const uschar * overall_message;
3254
3255 /* PRDR - get the final, overall response. For any non-success
3256 upgrade all the address statuses. */
3257
3258 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3259 sx.ob->final_timeout);
3260 if (!sx.ok)
3261 {
3262 if(errno == 0 && sx.buffer[0] == '4')
3263 {
3264 errno = ERRNO_DATA4XX;
3265 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3266 }
3267 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3268 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3269 addr->transport_return = PENDING_OK; /* allow set_errno action */
3270 goto RESPONSE_FAILED;
3271 }
3272
3273 /* Append the overall response to the individual PRDR response for logging
3274 and update the journal, or setup retry. */
3275
3276 overall_message = string_printing(sx.buffer);
3277 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3278 if (addr->transport_return == OK)
3279 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3280
3281 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3282 if (addr->transport_return == OK)
3283 {
3284 if (testflag(addr, af_homonym))
3285 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3286 else
3287 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3288
3289 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3290 len = Ustrlen(CS sx.buffer);
3291 if (write(journal_fd, sx.buffer, len) != len)
3292 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3293 "%s: %s", sx.buffer, strerror(errno));
3294 }
3295 else if (addr->transport_return == DEFER)
3296 retry_add_item(addr, addr->address_retry_key, -2);
3297 }
3298 #endif
3299
3300 /* Ensure the journal file is pushed out to disk. */
3301
3302 if (EXIMfsync(journal_fd) < 0)
3303 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3304 strerror(errno));
3305 }
3306 }
3307
3308
3309 /* Handle general (not specific to one address) failures here. The value of ok
3310 is used to skip over this code on the falling through case. A timeout causes a
3311 deferral. Other errors may defer or fail according to the response code, and
3312 may set up a special errno value, e.g. after connection chopped, which is
3313 assumed if errno == 0 and there is no text in the buffer. If control reaches
3314 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3315 the problem is not related to this specific message. */
3316
3317 if (!sx.ok)
3318 {
3319 int code, set_rc;
3320 uschar * set_message;
3321
3322 RESPONSE_FAILED:
3323 {
3324 save_errno = errno;
3325 message = NULL;
3326 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3327 sx.buffer, &code, &message, &pass_message);
3328 goto FAILED;
3329 }
3330
3331 SEND_FAILED:
3332 {
3333 save_errno = errno;
3334 code = '4';
3335 message = string_sprintf("send() to %s [%s] failed: %s",
3336 host->name, host->address, message ? message : US strerror(save_errno));
3337 sx.send_quit = FALSE;
3338 goto FAILED;
3339 }
3340
3341 FAILED:
3342 {
3343 BOOL message_error;
3344
3345 sx.ok = FALSE; /* For when reached by GOTO */
3346 set_message = message;
3347
3348 /* We want to handle timeouts after MAIL or "." and loss of connection after
3349 "." specially. They can indicate a problem with the sender address or with
3350 the contents of the message rather than a real error on the connection. These
3351 cases are treated in the same way as a 4xx response. This next bit of code
3352 does the classification. */
3353
3354 switch(save_errno)
3355 {
3356 case 0:
3357 case ERRNO_MAIL4XX:
3358 case ERRNO_DATA4XX:
3359 message_error = TRUE;
3360 break;
3361
3362 case ETIMEDOUT:
3363 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3364 Ustrncmp(smtp_command,"end ",4) == 0;
3365 break;
3366
3367 case ERRNO_SMTPCLOSED:
3368 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3369 break;
3370
3371 default:
3372 message_error = FALSE;
3373 break;
3374 }
3375
3376 /* Handle the cases that are treated as message errors. These are:
3377
3378 (a) negative response or timeout after MAIL
3379 (b) negative response after DATA
3380 (c) negative response or timeout or dropped connection after "."
3381 (d) utf8 support required and not offered
3382
3383 It won't be a negative response or timeout after RCPT, as that is dealt
3384 with separately above. The action in all cases is to set an appropriate
3385 error code for all the addresses, but to leave yield set to OK because the
3386 host itself has not failed. Of course, it might in practice have failed
3387 when we've had a timeout, but if so, we'll discover that at the next
3388 delivery attempt. For a temporary error, set the message_defer flag, and
3389 write to the logs for information if this is not the last host. The error
3390 for the last host will be logged as part of the address's log line. */
3391
3392 if (message_error)
3393 {
3394 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3395
3396 /* If there's an errno, the message contains just the identity of
3397 the host. */
3398
3399 if (code == '5')
3400 set_rc = FAIL;
3401 else /* Anything other than 5 is treated as temporary */
3402 {
3403 set_rc = DEFER;
3404 if (save_errno > 0)
3405 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3406
3407 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3408
3409 *message_defer = TRUE;
3410 }
3411 }
3412
3413 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3414 ".", or some other transportation error. We defer all addresses and yield
3415 DEFER, except for the case of failed add_headers expansion, or a transport
3416 filter failure, when the yield should be ERROR, to stop it trying other
3417 hosts. */
3418
3419 else
3420 {
3421 set_rc = DEFER;
3422 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3423 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3424 }
3425 }
3426
3427 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3428 #ifdef EXPERIMENTAL_DSN_INFO
3429 , sx.smtp_greeting, sx.helo_response
3430 #endif
3431 );
3432 }
3433
3434
3435 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3436 SMTP session tidily. However, if there were too many addresses to send in one
3437 message (indicated by first_addr being non-NULL) we want to carry on with the
3438 rest of them. Also, it is desirable to send more than one message down the SMTP
3439 connection if there are several waiting, provided we haven't already sent so
3440 many as to hit the configured limit. The function transport_check_waiting looks
3441 for a waiting message and returns its id. Then transport_pass_socket tries to
3442 set up a continued delivery by passing the socket on to another process. The
3443 variable send_rset is FALSE if a message has just been successfully transfered.
3444
3445 If we are already sending down a continued channel, there may be further
3446 addresses not yet delivered that are aimed at the same host, but which have not
3447 been passed in this run of the transport. In this case, continue_more will be
3448 true, and all we should do is send RSET if necessary, and return, leaving the
3449 channel open.
3450
3451 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3452 do not want to continue with other messages down the same channel, because that
3453 can lead to looping between two or more messages, all with the same,
3454 temporarily failing address(es). [The retry information isn't updated yet, so
3455 new processes keep on trying.] We probably also don't want to try more of this
3456 message's addresses either.
3457
3458 If we have started a TLS session, we have to end it before passing the
3459 connection to a new process. However, not all servers can handle this (Exim
3460 can), so we do not pass such a connection on if the host matches
3461 hosts_nopass_tls. */
3462
3463 DEBUG(D_transport)
3464 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3465 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3466 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3467
3468 if (sx.completed_addr && sx.ok && sx.send_quit)
3469 {
3470 BOOL more;
3471 smtp_compare_t t_compare;
3472
3473 t_compare.tblock = tblock;
3474 t_compare.current_sender_address = sender_address;
3475
3476 if ( sx.first_addr != NULL
3477 || continue_more
3478 || (
3479 #ifdef SUPPORT_TLS
3480 ( tls_out.active.sock < 0 && !continue_proxy_cipher
3481 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3482 )
3483 &&
3484 #endif
3485 transport_check_waiting(tblock->name, host->name,
3486 tblock->connection_max_messages, new_message_id, &more,
3487 (oicf)smtp_are_same_identities, (void*)&t_compare)
3488 ) )
3489 {
3490 uschar *msg;
3491 BOOL pass_message;
3492
3493 if (sx.send_rset)
3494 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3495 {
3496 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3497 host->address, strerror(errno));
3498 sx.send_quit = FALSE;
3499 }
3500 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3501 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3502 {
3503 int code;
3504 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3505 &pass_message);
3506 if (!sx.send_quit)
3507 {
3508 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3509 host->name, host->address, msg);
3510 }
3511 }
3512
3513 /* Either RSET was not needed, or it succeeded */
3514
3515 if (sx.ok)
3516 {
3517 int pfd[2];
3518 int socket_fd = sx.cctx.sock;
3519
3520
3521 if (sx.first_addr != NULL) /* More addresses still to be sent */
3522 { /* in this run of the transport */
3523 continue_sequence++; /* Causes * in logging */
3524 goto SEND_MESSAGE;
3525 }
3526
3527 /* Unless caller said it already has more messages listed for this host,
3528 pass the connection on to a new Exim process (below, the call to
3529 transport_pass_socket). If the caller has more ready, just return with
3530 the connection still open. */
3531
3532 #ifdef SUPPORT_TLS
3533 if (tls_out.active.sock >= 0)
3534 if ( continue_more
3535 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3536 {
3537 /* Before passing the socket on, or returning to caller with it still
3538 open, we must shut down TLS. Not all MTAs allow for the continuation
3539 of the SMTP session when TLS is shut down. We test for this by sending
3540 a new EHLO. If we don't get a good response, we don't attempt to pass
3541 the socket on. */
3542
3543 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
3544 smtp_peer_options = smtp_peer_options_wrap;
3545 sx.ok = !sx.smtps
3546 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3547 "EHLO %s\r\n", sx.helo_data) >= 0
3548 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3549 '2', sx.ob->command_timeout);
3550
3551 if (sx.ok && continue_more)
3552 return yield; /* More addresses for another run */
3553 }
3554 else
3555 {
3556 /* Set up a pipe for proxying TLS for the new transport process */
3557
3558 smtp_peer_options |= OPTION_TLS;
3559 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3560 socket_fd = pfd[1];
3561 else
3562 set_errno(sx.first_addr, errno, US"internal allocation problem",
3563 DEFER, FALSE, host
3564 # ifdef EXPERIMENTAL_DSN_INFO
3565 , sx.smtp_greeting, sx.helo_response
3566 # endif
3567 );
3568 }
3569 else
3570 #endif
3571 if (continue_more)
3572 return yield; /* More addresses for another run */
3573
3574 /* If the socket is successfully passed, we mustn't send QUIT (or
3575 indeed anything!) from here. */
3576
3577 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3578 propagate it from the initial
3579 */
3580 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3581 host->address, new_message_id, socket_fd))
3582 {
3583 sx.send_quit = FALSE;
3584
3585 /* We have passed the client socket to a fresh transport process.
3586 If TLS is still active, we need to proxy it for the transport we
3587 just passed the baton to. Fork a child to to do it, and return to
3588 get logging done asap. Which way to place the work makes assumptions
3589 about post-fork prioritisation which may not hold on all platforms. */
3590 #ifdef SUPPORT_TLS
3591 if (tls_out.active.sock >= 0)
3592 {
3593 int pid = fork();
3594 if (pid == 0) /* child; fork again to disconnect totally */
3595 {
3596 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3597 /* does not return */
3598 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
3599 sx.ob->command_timeout);
3600 }
3601
3602 if (pid > 0) /* parent */
3603 {
3604 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3605 close(pfd[0]);
3606 /* tidy the inter-proc to disconn the proxy proc */
3607 waitpid(pid, NULL, 0);
3608 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
3609 sx.cctx.tls_ctx = NULL;
3610 (void)close(sx.cctx.sock);
3611 sx.cctx.sock = -1;
3612 continue_transport = NULL;
3613 continue_hostname = NULL;
3614 return yield;
3615 }
3616 log_write(0, LOG_PANIC_DIE, "fork failed");
3617 }
3618 #endif
3619 }
3620 }
3621
3622 /* If RSET failed and there are addresses left, they get deferred. */
3623 else
3624 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3625 #ifdef EXPERIMENTAL_DSN_INFO
3626 , sx.smtp_greeting, sx.helo_response
3627 #endif
3628 );
3629 }
3630 }
3631
3632 /* End off tidily with QUIT unless the connection has died or the socket has
3633 been passed to another process. There has been discussion on the net about what
3634 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3635 to wait for a response, but on the other hand, there isn't anything one can do
3636 with an error response, other than log it. Exim used to do that. However,
3637 further discussion suggested that it is positively advantageous not to wait for
3638 the response, but to close the session immediately. This is supposed to move
3639 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3640 load from the server. (Hosts that are both servers and clients may not see much
3641 difference, of course.) Further discussion indicated that this was safe to do
3642 on Unix systems which have decent implementations of TCP/IP that leave the
3643 connection around for a while (TIME_WAIT) after the application has gone away.
3644 This enables the response sent by the server to be properly ACKed rather than
3645 timed out, as can happen on broken TCP/IP implementations on other OS.
3646
3647 This change is being made on 31-Jul-98. After over a year of trouble-free
3648 operation, the old commented-out code was removed on 17-Sep-99. */
3649
3650 SEND_QUIT:
3651 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3652
3653 END_OFF:
3654
3655 #ifdef SUPPORT_TLS
3656 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3657 #endif
3658
3659 /* Close the socket, and return the appropriate value, first setting
3660 works because the NULL setting is passed back to the calling process, and
3661 remote_max_parallel is forced to 1 when delivering over an existing connection,
3662
3663 If all went well and continue_more is set, we shouldn't actually get here if
3664 there are further addresses, as the return above will be taken. However,
3665 writing RSET might have failed, or there may be other addresses whose hosts are
3666 specified in the transports, and therefore not visible at top level, in which
3667 case continue_more won't get set. */
3668
3669 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3670 if (sx.send_quit)
3671 {
3672 shutdown(sx.cctx.sock, SHUT_WR);
3673 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3674 for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3675 rc--; /* drain socket */
3676 }
3677 (void)close(sx.cctx.sock);
3678
3679 #ifndef DISABLE_EVENT
3680 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3681 #endif
3682
3683 continue_transport = NULL;
3684 continue_hostname = NULL;
3685 return yield;
3686 }
3687
3688
3689
3690
3691 /*************************************************
3692 * Closedown entry point *
3693 *************************************************/
3694
3695 /* This function is called when exim is passed an open smtp channel
3696 from another incarnation, but the message which it has been asked
3697 to deliver no longer exists. The channel is on stdin.
3698
3699 We might do fancy things like looking for another message to send down
3700 the channel, but if the one we sought has gone, it has probably been
3701 delivered by some other process that itself will seek further messages,
3702 so just close down our connection.
3703
3704 Argument: pointer to the transport instance block
3705 Returns: nothing
3706 */
3707
3708 void
3709 smtp_transport_closedown(transport_instance *tblock)
3710 {
3711 smtp_transport_options_block *ob =
3712 (smtp_transport_options_block *)tblock->options_block;
3713 client_conn_ctx cctx;
3714 smtp_inblock inblock;
3715 smtp_outblock outblock;
3716 uschar buffer[256];
3717 uschar inbuffer[4096];
3718 uschar outbuffer[16];
3719
3720 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
3721 cctx.sock = fileno(stdin);
3722 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
3723
3724 inblock.cctx = &cctx;
3725 inblock.buffer = inbuffer;
3726 inblock.buffersize = sizeof(inbuffer);
3727 inblock.ptr = inbuffer;
3728 inblock.ptrend = inbuffer;
3729
3730 outblock.cctx = &cctx;
3731 outblock.buffersize = sizeof(outbuffer);
3732 outblock.buffer = outbuffer;
3733 outblock.ptr = outbuffer;
3734 outblock.cmd_count = 0;
3735 outblock.authenticating = FALSE;
3736
3737 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3738 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3739 ob->command_timeout);
3740 (void)close(cctx.sock);
3741 }
3742
3743
3744
3745 /*************************************************
3746 * Prepare addresses for delivery *
3747 *************************************************/
3748
3749 /* This function is called to flush out error settings from previous delivery
3750 attempts to other hosts. It also records whether we got here via an MX record
3751 or not in the more_errno field of the address. We are interested only in
3752 addresses that are still marked DEFER - others may have got delivered to a
3753 previously considered IP address. Set their status to PENDING_DEFER to indicate
3754 which ones are relevant this time.
3755
3756 Arguments:
3757 addrlist the list of addresses
3758 host the host we are delivering to
3759
3760 Returns: the first address for this delivery
3761 */
3762
3763 static address_item *
3764 prepare_addresses(address_item *addrlist, host_item *host)
3765 {
3766 address_item *first_addr = NULL;
3767 address_item *addr;
3768 for (addr = addrlist; addr; addr = addr->next)
3769 if (addr->transport_return == DEFER)
3770 {
3771 if (!first_addr) first_addr = addr;
3772 addr->transport_return = PENDING_DEFER;
3773 addr->basic_errno = 0;
3774 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3775 addr->message = NULL;
3776 #ifdef SUPPORT_TLS
3777 addr->cipher = NULL;
3778 addr->ourcert = NULL;
3779 addr->peercert = NULL;
3780 addr->peerdn = NULL;
3781 addr->ocsp = OCSP_NOT_REQ;
3782 #endif
3783 #ifdef EXPERIMENTAL_DSN_INFO
3784 addr->smtp_greeting = NULL;
3785 addr->helo_response = NULL;
3786 #endif
3787 }
3788 return first_addr;
3789 }
3790
3791
3792
3793 /*************************************************
3794 * Main entry point *
3795 *************************************************/
3796
3797 /* See local README for interface details. As this is a remote transport, it is
3798 given a chain of addresses to be delivered in one connection, if possible. It
3799 always returns TRUE, indicating that each address has its own independent
3800 status set, except if there is a setting up problem, in which case it returns
3801 FALSE. */
3802
3803 BOOL
3804 smtp_transport_entry(
3805 transport_instance *tblock, /* data for this instantiation */
3806 address_item *addrlist) /* addresses we are working on */
3807 {
3808 int cutoff_retry;
3809 int defport;
3810 int hosts_defer = 0;
3811 int hosts_fail = 0;
3812 int hosts_looked_up = 0;
3813 int hosts_retry = 0;
3814 int hosts_serial = 0;
3815 int hosts_total = 0;
3816 int total_hosts_tried = 0;
3817 address_item *addr;
3818 BOOL expired = TRUE;
3819 uschar *expanded_hosts = NULL;
3820 uschar *pistring;
3821 uschar *tid = string_sprintf("%s transport", tblock->name);
3822 smtp_transport_options_block *ob =
3823 (smtp_transport_options_block *)(tblock->options_block);
3824 host_item *hostlist = addrlist->host_list;
3825 host_item *host;
3826
3827 DEBUG(D_transport)
3828 {
3829 debug_printf("%s transport entered\n", tblock->name);
3830 for (addr = addrlist; addr; addr = addr->next)
3831 debug_printf(" %s\n", addr->address);
3832 if (hostlist)
3833 {
3834 debug_printf("hostlist:\n");
3835 for (host = hostlist; host; host = host->next)
3836 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3837 }
3838 if (continue_hostname)
3839 debug_printf("already connected to %s [%s] (on fd %d)\n",
3840 continue_hostname, continue_host_address,
3841 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
3842 }
3843
3844 /* Set the flag requesting that these hosts be added to the waiting
3845 database if the delivery fails temporarily or if we are running with
3846 queue_smtp or a 2-stage queue run. This gets unset for certain
3847 kinds of error, typically those that are specific to the message. */
3848
3849 update_waiting = TRUE;
3850
3851 /* If a host list is not defined for the addresses - they must all have the
3852 same one in order to be passed to a single transport - or if the transport has
3853 a host list with hosts_override set, use the host list supplied with the
3854 transport. It is an error for this not to exist. */
3855
3856 if (!hostlist || (ob->hosts_override && ob->hosts))
3857 {
3858 if (!ob->hosts)
3859 {
3860 addrlist->message = string_sprintf("%s transport called with no hosts set",
3861 tblock->name);
3862 addrlist->transport_return = PANIC;
3863 return FALSE; /* Only top address has status */
3864 }
3865
3866 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3867 ob->hosts);
3868
3869 /* If the transport's host list contains no '$' characters, and we are not
3870 randomizing, it is fixed and therefore a chain of hosts can be built once
3871 and for all, and remembered for subsequent use by other calls to this
3872 transport. If, on the other hand, the host list does contain '$', or we are
3873 randomizing its order, we have to rebuild it each time. In the fixed case,
3874 as the hosts string will never be used again, it doesn't matter that we
3875 replace all the : characters with zeros. */
3876
3877 if (!ob->hostlist)
3878 {
3879 uschar *s = ob->hosts;
3880
3881 if (Ustrchr(s, '$') != NULL)
3882 {
3883 if (!(expanded_hosts = expand_string(s)))
3884 {
3885 addrlist->message = string_sprintf("failed to expand list of hosts "
3886 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3887 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3888 return FALSE; /* Only top address has status */
3889 }
3890 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3891 "\"%s\"\n", s, expanded_hosts);
3892 s = expanded_hosts;
3893 }
3894 else
3895 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3896
3897 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3898
3899 /* Check that the expansion yielded something useful. */
3900 if (!hostlist)
3901 {
3902 addrlist->message =
3903 string_sprintf("%s transport has empty hosts setting", tblock->name);
3904 addrlist->transport_return = PANIC;
3905 return FALSE; /* Only top address has status */
3906 }
3907
3908 /* If there was no expansion of hosts, save the host list for
3909 next time. */
3910
3911 if (!expanded_hosts) ob->hostlist = hostlist;
3912 }
3913
3914 /* This is not the first time this transport has been run in this delivery;
3915 the host list was built previously. */
3916
3917 else
3918 hostlist = ob->hostlist;
3919 }
3920
3921 /* The host list was supplied with the address. If hosts_randomize is set, we
3922 must sort it into a random order if it did not come from MX records and has not
3923 already been randomized (but don't bother if continuing down an existing
3924 connection). */
3925
3926 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3927 {
3928 host_item *newlist = NULL;
3929 while (hostlist)
3930 {
3931 host_item *h = hostlist;
3932 hostlist = hostlist->next;
3933
3934 h->sort_key = random_number(100);
3935
3936 if (!newlist)
3937 {
3938 h->next = NULL;
3939 newlist = h;
3940 }
3941 else if (h->sort_key < newlist->sort_key)
3942 {
3943 h->next = newlist;
3944 newlist = h;
3945 }
3946 else
3947 {
3948 host_item *hh = newlist;
3949 while (hh->next)
3950 {
3951 if (h->sort_key < hh->next->sort_key) break;
3952 hh = hh->next;
3953 }
3954 h->next = hh->next;
3955 hh->next = h;
3956 }
3957 }
3958
3959 hostlist = addrlist->host_list = newlist;
3960 }
3961
3962 /* Sort out the default port. */
3963
3964 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3965
3966 /* For each host-plus-IP-address on the list:
3967
3968 . If this is a continued delivery and the host isn't the one with the
3969 current connection, skip.
3970
3971 . If the status is unusable (i.e. previously failed or retry checked), skip.
3972
3973 . If no IP address set, get the address, either by turning the name into
3974 an address, calling gethostbyname if gethostbyname is on, or by calling
3975 the DNS. The DNS may yield multiple addresses, in which case insert the
3976 extra ones into the list.
3977
3978 . Get the retry data if not previously obtained for this address and set the
3979 field which remembers the state of this address. Skip if the retry time is
3980 not reached. If not, remember whether retry data was found. The retry string
3981 contains both the name and the IP address.
3982
3983 . Scan the list of addresses and mark those whose status is DEFER as
3984 PENDING_DEFER. These are the only ones that will be processed in this cycle
3985 of the hosts loop.
3986
3987 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3988 Some addresses may be successfully delivered, others may fail, and yet
3989 others may get temporary errors and so get marked DEFER.
3990
3991 . The return from the delivery attempt is OK if a connection was made and a
3992 valid SMTP dialogue was completed. Otherwise it is DEFER.
3993
3994 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3995
3996 . If fail to connect, or other defer state, add a retry item.
3997
3998 . If there are any addresses whose status is still DEFER, carry on to the
3999 next host/IPaddress, unless we have tried the number of hosts given
4000 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4001 there is some fancy logic for hosts_max_try that means its limit can be
4002 overstepped in some circumstances.
4003
4004 If we get to the end of the list, all hosts have deferred at least one address,
4005 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4006 delivery attempt to those hosts whose last try was before the arrival time of
4007 the current message. To cope with this, we have to go round the loop a second
4008 time. After that, set the status and error data for any addresses that haven't
4009 had it set already. */
4010
4011 for (cutoff_retry = 0;
4012 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4013 cutoff_retry++)
4014 {
4015 host_item *nexthost = NULL;
4016 int unexpired_hosts_tried = 0;
4017 BOOL continue_host_tried = FALSE;
4018
4019 retry_non_continued:
4020 for (host = hostlist;
4021 host
4022 && unexpired_hosts_tried < ob->hosts_max_try
4023 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4024 host = nexthost)
4025 {
4026 int rc;
4027 int host_af;
4028 uschar *rs;
4029 BOOL host_is_expired = FALSE;
4030 BOOL message_defer = FALSE;
4031 BOOL some_deferred = FALSE;
4032 address_item *first_addr = NULL;
4033 uschar *interface = NULL;
4034 uschar *retry_host_key = NULL;
4035 uschar *retry_message_key = NULL;
4036 uschar *serialize_key = NULL;
4037
4038 /* Default next host is next host. :-) But this can vary if the
4039 hosts_max_try limit is hit (see below). It may also be reset if a host
4040 address is looked up here (in case the host was multihomed). */
4041
4042 nexthost = host->next;
4043
4044 /* If the address hasn't yet been obtained from the host name, look it up
4045 now, unless the host is already marked as unusable. If it is marked as
4046 unusable, it means that the router was unable to find its IP address (in
4047 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4048 the lookup failed last time. We don't get this far if *all* MX records
4049 point to non-existent hosts; that is treated as a hard error.
4050
4051 We can just skip this host entirely. When the hosts came from the router,
4052 the address will timeout based on the other host(s); when the address is
4053 looked up below, there is an explicit retry record added.
4054
4055 Note that we mustn't skip unusable hosts if the address is not unset; they
4056 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4057
4058 if (!host->address)
4059 {
4060 int new_port, flags;
4061 host_item *hh;
4062
4063 if (host->status >= hstatus_unusable)
4064 {
4065 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4066 host->name);
4067 continue;
4068 }
4069
4070 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4071
4072 /* The host name is permitted to have an attached port. Find it, and
4073 strip it from the name. Just remember it for now. */
4074
4075 new_port = host_item_get_port(host);
4076
4077 /* Count hosts looked up */
4078
4079 hosts_looked_up++;
4080
4081 /* Find by name if so configured, or if it's an IP address. We don't
4082 just copy the IP address, because we need the test-for-local to happen. */
4083
4084 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4085 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4086 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4087
4088 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4089 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4090 else
4091 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4092 &ob->dnssec, /* domains for request/require */
4093 NULL, NULL);
4094
4095 /* Update the host (and any additional blocks, resulting from
4096 multihoming) with a host-specific port, if any. */
4097
4098 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4099
4100 /* Failure to find the host at this time (usually DNS temporary failure)
4101 is really a kind of routing failure rather than a transport failure.
4102 Therefore we add a retry item of the routing kind, not to stop us trying
4103 to look this name up here again, but to ensure the address gets timed
4104 out if the failures go on long enough. A complete failure at this point
4105 commonly points to a configuration error, but the best action is still
4106 to carry on for the next host. */
4107
4108 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4109 {
4110 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4111 expired = FALSE;
4112 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4113 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4114 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4115 host->status = hstatus_unusable;
4116
4117 for (addr = addrlist; addr; addr = addr->next)
4118 {
4119 if (addr->transport_return != DEFER) continue;
4120 addr->basic_errno = ERRNO_UNKNOWNHOST;
4121 addr->message = string_sprintf(
4122 rc == HOST_FIND_SECURITY
4123 ? "lookup of IP address for %s was insecure"
4124 : "failed to lookup IP address for %s",
4125 host->name);
4126 }
4127 continue;
4128 }
4129
4130 /* If the host is actually the local host, we may have a problem, or
4131 there may be some cunning configuration going on. In the problem case,
4132 log things and give up. The default transport status is already DEFER. */
4133
4134 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4135 {
4136 for (addr = addrlist; addr; addr = addr->next)
4137 {
4138 addr->basic_errno = 0;
4139 addr->message = string_sprintf("%s transport found host %s to be "
4140 "local", tblock->name, host->name);
4141 }
4142 goto END_TRANSPORT;
4143 }
4144 } /* End of block for IP address lookup */
4145
4146 /* If this is a continued delivery, we are interested only in the host
4147 which matches the name of the existing open channel. The check is put
4148 here after the local host lookup, in case the name gets expanded as a
4149 result of the lookup. Set expired FALSE, to save the outer loop executing
4150 twice. */
4151
4152 if (continue_hostname)
4153 if ( Ustrcmp(continue_hostname, host->name) != 0
4154 || Ustrcmp(continue_host_address, host->address) != 0
4155 )
4156 {
4157 expired = FALSE;
4158 continue; /* With next host */
4159 }
4160 else
4161 continue_host_tried = TRUE;
4162
4163 /* Reset the default next host in case a multihomed host whose addresses
4164 are not looked up till just above added to the host list. */
4165
4166 nexthost = host->next;
4167
4168 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4169 domain is in queue_smtp_domains, we don't actually want to attempt any
4170 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4171 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4172 were not in it. We don't want to hold up all SMTP deliveries! Except when
4173 doing a two-stage queue run, don't do this if forcing. */
4174
4175 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4176 match_isinlist(addrlist->domain,
4177 (const uschar **)&queue_smtp_domains, 0,
4178 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4179 {
4180 expired = FALSE;
4181 for (addr = addrlist; addr; addr = addr->next)
4182 if (addr->transport_return == DEFER)
4183 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4184 continue; /* With next host */
4185 }
4186
4187 /* Count hosts being considered - purely for an intelligent comment
4188 if none are usable. */
4189
4190 hosts_total++;
4191
4192 /* Set $host and $host address now in case they are needed for the
4193 interface expansion or the serialize_hosts check; they remain set if an
4194 actual delivery happens. */
4195
4196 deliver_host = host->name;
4197 deliver_host_address = host->address;
4198 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4199 : host->dnssec == DS_NO ? US"no"
4200 : US"";
4201
4202 /* Set up a string for adding to the retry key if the port number is not
4203 the standard SMTP port. A host may have its own port setting that overrides
4204 the default. */
4205
4206 pistring = string_sprintf(":%d", host->port == PORT_NONE
4207 ? defport : host->port);
4208 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4209
4210 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4211 string is set, even if constant (as different transports can have different
4212 constant settings), we must add it to the key that is used for retries,
4213 because connections to the same host from a different interface should be
4214 treated separately. */
4215
4216 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4217 if ((rs = ob->interface) && *rs)
4218 {
4219 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4220 return FALSE;
4221 pistring = string_sprintf("%s/%s", pistring, interface);
4222 }
4223
4224 /* The first time round the outer loop, check the status of the host by
4225 inspecting the retry data. The second time round, we are interested only
4226 in expired hosts that haven't been tried since this message arrived. */
4227
4228 if (cutoff_retry == 0)
4229 {
4230 BOOL incl_ip;
4231 /* Ensure the status of the address is set by checking retry data if
4232 necessary. There may be host-specific retry data (applicable to all
4233 messages) and also data for retries of a specific message at this host.
4234 If either of these retry records are actually read, the keys used are
4235 returned to save recomputing them later. */
4236
4237 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4238 US"retry_include_ip_address", ob->retry_include_ip_address,
4239 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4240 continue; /* with next host */
4241
4242 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4243 incl_ip, &retry_host_key, &retry_message_key);
4244
4245 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4246 (host->address == NULL)? US"" : host->address, pistring,
4247 (host->status == hstatus_usable)? "usable" :
4248 (host->status == hstatus_unusable)? "unusable" :
4249 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4250
4251 /* Skip this address if not usable at this time, noting if it wasn't
4252 actually expired, both locally and in the address. */
4253
4254 switch (host->status)
4255 {
4256 case hstatus_unusable:
4257 expired = FALSE;
4258 setflag(addrlist, af_retry_skipped);
4259 /* Fall through */
4260
4261 case hstatus_unusable_expired:
4262 switch (host->why)
4263 {
4264 case hwhy_retry: hosts_retry++; break;
4265 case hwhy_failed: hosts_fail++; break;
4266 case hwhy_insecure:
4267 case hwhy_deferred: hosts_defer++; break;
4268 }
4269
4270 /* If there was a retry message key, implying that previously there
4271 was a message-specific defer, we don't want to update the list of
4272 messages waiting for these hosts. */
4273
4274 if (retry_message_key) update_waiting = FALSE;
4275 continue; /* With the next host or IP address */
4276 }
4277 }
4278
4279 /* Second time round the loop: if the address is set but expired, and
4280 the message is newer than the last try, let it through. */
4281
4282 else
4283 {
4284 if ( !host->address
4285 || host->status != hstatus_unusable_expired
4286 || host->last_try > received_time.tv_sec)
4287 continue;
4288 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4289 host->name, host->address, pistring);
4290 host_is_expired = TRUE;
4291 }
4292
4293 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4294 it remains TRUE only if all hosts are expired and none are actually tried.
4295 */
4296
4297 expired = FALSE;
4298
4299 /* If this host is listed as one to which access must be serialized,
4300 see if another Exim process has a connection to it, and if so, skip
4301 this host. If not, update the database to record our connection to it
4302 and remember this for later deletion. Do not do any of this if we are
4303 sending the message down a pre-existing connection. */
4304
4305 if ( !continue_hostname
4306 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4307 {
4308 serialize_key = string_sprintf("host-serialize-%s", host->name);
4309 if (!enq_start(serialize_key, 1))
4310 {
4311 DEBUG(D_transport)
4312 debug_printf("skipping host %s because another Exim process "
4313 "is connected to it\n", host->name);
4314 hosts_serial++;
4315 continue;
4316 }
4317 }
4318
4319 /* OK, we have an IP address that is not waiting for its retry time to
4320 arrive (it might be expired) OR (second time round the loop) we have an
4321 expired host that hasn't been tried since the message arrived. Have a go
4322 at delivering the message to it. First prepare the addresses by flushing
4323 out the result of previous attempts, and finding the first address that
4324 is still to be delivered. */
4325
4326 first_addr = prepare_addresses(addrlist, host);
4327
4328 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4329 message_id, host->name, host->address, addrlist->address,
4330 addrlist->next ? ", ..." : "");
4331
4332 set_process_info("delivering %s to %s [%s] (%s%s)",
4333 message_id, host->name, host->address, addrlist->address,
4334 addrlist->next ? ", ..." : "");
4335
4336 /* This is not for real; don't do the delivery. If there are
4337 any remaining hosts, list them. */
4338
4339 if (dont_deliver)
4340 {
4341 host_item *host2;
4342 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4343 for (addr = addrlist; addr; addr = addr->next)
4344 {
4345 addr->host_used = host;
4346 addr->special_action = '*';
4347 addr->message = US"delivery bypassed by -N option";
4348 }
4349 DEBUG(D_transport)
4350 {
4351 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4352 "*** host and remaining hosts:\n", tblock->name);
4353 for (host2 = host; host2; host2 = host2->next)
4354 debug_printf(" %s [%s]\n", host2->name,
4355 host2->address ? host2->address : US"unset");
4356 }
4357 rc = OK;
4358 }
4359
4360 /* This is for real. If the host is expired, we don't count it for
4361 hosts_max_retry. This ensures that all hosts must expire before an address
4362 is timed out, unless hosts_max_try_hardlimit (which protects against
4363 lunatic DNS configurations) is reached.
4364
4365 If the host is not expired and we are about to hit the hosts_max_retry
4366 limit, check to see if there is a subsequent hosts with a different MX
4367 value. If so, make that the next host, and don't count this one. This is a
4368 heuristic to make sure that different MXs do get tried. With a normal kind
4369 of retry rule, they would get tried anyway when the earlier hosts were
4370 delayed, but if the domain has a "retry every time" type of rule - as is
4371 often used for the the very large ISPs, that won't happen. */
4372
4373 else
4374 {
4375 host_item * thost;
4376 /* Make a copy of the host if it is local to this invocation
4377 of the transport. */
4378
4379 if (expanded_hosts)
4380 {
4381 thost = store_get(sizeof(host_item));
4382 *thost = *host;
4383 thost->name = string_copy(host->name);
4384 thost->address = string_copy(host->address);
4385 }
4386 else
4387 thost = host;
4388
4389 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4390 {
4391 host_item *h;
4392 DEBUG(D_transport)
4393 debug_printf("hosts_max_try limit reached with this host\n");
4394 for (h = host; h; h = h->next) if (h->mx != host->mx)
4395 {
4396 nexthost = h;
4397 unexpired_hosts_tried--;
4398 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4399 "and will be tried\n");
4400 break;
4401 }
4402 }
4403
4404 /* Attempt the delivery. */
4405
4406 total_hosts_tried++;
4407 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4408 &message_defer, FALSE);
4409
4410 /* Yield is one of:
4411 OK => connection made, each address contains its result;
4412 message_defer is set for message-specific defers (when all
4413 recipients are marked defer)
4414 DEFER => there was a non-message-specific delivery problem;
4415 ERROR => there was a problem setting up the arguments for a filter,
4416 or there was a problem with expanding added headers
4417 */
4418
4419 /* If the result is not OK, there was a non-message-specific problem.
4420 If the result is DEFER, we need to write to the logs saying what happened
4421 for this particular host, except in the case of authentication and TLS
4422 failures, where the log has already been written. If all hosts defer a
4423 general message is written at the end. */
4424
4425 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4426 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4427 write_logs(host, first_addr->message, first_addr->basic_errno);
4428
4429 #ifndef DISABLE_EVENT
4430 if (rc == DEFER)
4431 deferred_event_raise(first_addr, host);
4432 #endif
4433
4434 /* If STARTTLS was accepted, but there was a failure in setting up the
4435 TLS session (usually a certificate screwup), and the host is not in
4436 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4437 TLS forcibly turned off. We have to start from scratch with a new SMTP
4438 connection. That's why the retry is done from here, not from within
4439 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4440 session, so the in-clear transmission after those errors, if permitted,
4441 happens inside smtp_deliver().] */
4442
4443 #ifdef SUPPORT_TLS
4444 if ( rc == DEFER
4445 && first_addr->basic_errno == ERRNO_TLSFAILURE
4446 && ob->tls_tempfail_tryclear
4447 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4448 )
4449 {
4450 log_write(0, LOG_MAIN,
4451 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4452 first_addr->message, host->name, host->address);
4453 first_addr = prepare_addresses(addrlist, host);
4454 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4455 &message_defer, TRUE);
4456 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4457 write_logs(host, first_addr->message, first_addr->basic_errno);
4458 # ifndef DISABLE_EVENT
4459 if (rc == DEFER)
4460 deferred_event_raise(first_addr, host);
4461 # endif
4462 }
4463 #endif /*SUPPORT_TLS*/
4464 }
4465
4466 /* Delivery attempt finished */
4467
4468 rs = rc == OK ? US"OK"
4469 : rc == DEFER ? US"DEFER"
4470 : rc == ERROR ? US"ERROR"
4471 : US"?";
4472
4473 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4474 message_id, host->name, host->address, addrlist->address,
4475 addrlist->next ? " (& others)" : "", rs);
4476
4477 /* Release serialization if set up */
4478
4479 if (serialize_key) enq_end(serialize_key);
4480
4481 /* If the result is DEFER, or if a host retry record is known to exist, we
4482 need to add an item to the retry chain for updating the retry database
4483 at the end of delivery. We only need to add the item to the top address,
4484 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4485 for any other delivery attempts using the same address. (It is copied into
4486 the unusable tree at the outer level, so even if different address blocks
4487 contain the same address, it still won't get tried again.) */
4488
4489 if (rc == DEFER || retry_host_key)
4490 {
4491 int delete_flag = rc != DEFER ? rf_delete : 0;
4492 if (!retry_host_key)
4493 {
4494 BOOL incl_ip;
4495 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4496 US"retry_include_ip_address", ob->retry_include_ip_address,
4497 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4498 incl_ip = TRUE; /* error; use most-specific retry record */
4499
4500 retry_host_key = incl_ip
4501 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4502 : string_sprintf("T:%S%s", host->name, pistring);
4503 }
4504
4505 /* If a delivery of another message over an existing SMTP connection
4506 yields DEFER, we do NOT set up retry data for the host. This covers the
4507 case when there are delays in routing the addresses in the second message
4508 that are so long that the server times out. This is alleviated by not
4509 routing addresses that previously had routing defers when handling an
4510 existing connection, but even so, this case may occur (e.g. if a
4511 previously happily routed address starts giving routing defers). If the
4512 host is genuinely down, another non-continued message delivery will
4513 notice it soon enough. */
4514
4515 if (delete_flag != 0 || !continue_hostname)
4516 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4517
4518 /* We may have tried an expired host, if its retry time has come; ensure
4519 the status reflects the expiry for the benefit of any other addresses. */
4520
4521 if (rc == DEFER)
4522 {
4523 host->status = host_is_expired
4524 ? hstatus_unusable_expired : hstatus_unusable;
4525 host->why = hwhy_deferred;
4526 }
4527 }
4528
4529 /* If message_defer is set (host was OK, but every recipient got deferred
4530 because of some message-specific problem), or if that had happened
4531 previously so that a message retry key exists, add an appropriate item
4532 to the retry chain. Note that if there was a message defer but now there is
4533 a host defer, the message defer record gets deleted. That seems perfectly
4534 reasonable. Also, stop the message from being remembered as waiting
4535 for specific hosts. */
4536
4537 if (message_defer || retry_message_key)
4538 {
4539 int delete_flag = message_defer ? 0 : rf_delete;
4540 if (!retry_message_key)
4541 {
4542 BOOL incl_ip;
4543 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4544 US"retry_include_ip_address", ob->retry_include_ip_address,
4545 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4546 incl_ip = TRUE; /* error; use most-specific retry record */
4547
4548 retry_message_key = incl_ip
4549 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4550 message_id)
4551 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4552 }
4553 retry_add_item(addrlist, retry_message_key,
4554 rf_message | rf_host | delete_flag);
4555 update_waiting = FALSE;
4556 }
4557
4558 /* Any return other than DEFER (that is, OK or ERROR) means that the
4559 addresses have got their final statuses filled in for this host. In the OK
4560 case, see if any of them are deferred. */
4561
4562 if (rc == OK)
4563 for (addr = addrlist; addr; addr = addr->next)
4564 if (addr->transport_return == DEFER)
4565 {
4566 some_deferred = TRUE;
4567 break;
4568 }
4569
4570 /* If no addresses deferred or the result was ERROR, return. We do this for
4571 ERROR because a failing filter set-up or add_headers expansion is likely to
4572 fail for any host we try. */
4573
4574 if (rc == ERROR || (rc == OK && !some_deferred))
4575 {
4576 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4577 return TRUE; /* Each address has its status */
4578 }
4579
4580 /* If the result was DEFER or some individual addresses deferred, let
4581 the loop run to try other hosts with the deferred addresses, except for the
4582 case when we were trying to deliver down an existing channel and failed.
4583 Don't try any other hosts in this case. */
4584
4585 if (continue_hostname) break;
4586
4587 /* If the whole delivery, or some individual addresses, were deferred and
4588 there are more hosts that could be tried, do not count this host towards
4589 the hosts_max_try limit if the age of the message is greater than the
4590 maximum retry time for this host. This means we may try try all hosts,
4591 ignoring the limit, when messages have been around for some time. This is
4592 important because if we don't try all hosts, the address will never time
4593 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4594
4595 if ((rc == DEFER || some_deferred) && nexthost)
4596 {
4597 BOOL timedout;
4598 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4599
4600 if (retry && retry->rules)
4601 {
4602 retry_rule *last_rule;
4603 for (last_rule = retry->rules;
4604 last_rule->next;
4605 last_rule = last_rule->next);
4606 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4607 }
4608 else timedout = TRUE; /* No rule => timed out */
4609
4610 if (timedout)
4611 {
4612 unexpired_hosts_tried--;
4613 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4614 "hosts_max_try (message older than host's retry time)\n");
4615 }
4616 }
4617 } /* End of loop for trying multiple hosts. */
4618
4619 /* If we failed to find a matching host in the list, for an already-open
4620 connection, just close it and start over with the list. This can happen
4621 for routing that changes from run to run, or big multi-IP sites with
4622 round-robin DNS. */
4623
4624 if (continue_hostname && !continue_host_tried)
4625 {
4626 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
4627
4628 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4629 #ifdef SUPPORT_TLS
4630 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
4631 transport */
4632 /*XXX doublecheck that! */
4633
4634 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
4635 {
4636 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
4637 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4638 cutthrough.cctx.tls_ctx = NULL;
4639 cutthrough.is_tls = FALSE;
4640 }
4641 else
4642 #else
4643 (void) write(fd, US"QUIT\r\n", 6);
4644 #endif
4645 (void) close(fd);
4646 cutthrough.cctx.sock = -1;
4647 continue_hostname = NULL;
4648 goto retry_non_continued;
4649 }
4650
4651 /* This is the end of the loop that repeats iff expired is TRUE and
4652 ob->delay_after_cutoff is FALSE. The second time round we will
4653 try those hosts that haven't been tried since the message arrived. */
4654
4655 DEBUG(D_transport)
4656 {
4657 debug_printf("all IP addresses skipped or deferred at least one address\n");
4658 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4659 debug_printf("retrying IP addresses not tried since message arrived\n");
4660 }
4661 }
4662
4663
4664 /* Get here if all IP addresses are skipped or defer at least one address. In
4665 MUA wrapper mode, this will happen only for connection or other non-message-
4666 specific failures. Force the delivery status for all addresses to FAIL. */
4667
4668 if (mua_wrapper)
4669 {
4670 for (addr = addrlist; addr; addr = addr->next)
4671 addr->transport_return = FAIL;
4672 goto END_TRANSPORT;
4673 }
4674
4675 /* In the normal, non-wrapper case, add a standard message to each deferred
4676 address if there hasn't been an error, that is, if it hasn't actually been
4677 tried this time. The variable "expired" will be FALSE if any deliveries were
4678 actually tried, or if there was at least one host that was not expired. That
4679 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4680 a delivery has been tried, an error code will be set, and the failing of the
4681 message is handled by the retry code later.
4682
4683 If queue_smtp is set, or this transport was called to send a subsequent message
4684 down an existing TCP/IP connection, and something caused the host not to be
4685 found, we end up here, but can detect these cases and handle them specially. */
4686
4687 for (addr = addrlist; addr; addr = addr->next)
4688 {
4689 /* If host is not NULL, it means that we stopped processing the host list
4690 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4691 means we need to behave as if some hosts were skipped because their retry
4692 time had not come. Specifically, this prevents the address from timing out.
4693 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4694 hosts were tried. */
4695
4696 if (host)
4697 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4698 {
4699 DEBUG(D_transport)
4700 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4701 "hosts were tried\n");
4702 }
4703 else
4704 {
4705 DEBUG(D_transport)
4706 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4707 setflag(addr, af_retry_skipped);
4708 }
4709
4710 if (queue_smtp) /* no deliveries attempted */
4711 {
4712 addr->transport_return = DEFER;
4713 addr->basic_errno = 0;
4714 addr->message = US"SMTP delivery explicitly queued";
4715 }
4716
4717 else if ( addr->transport_return == DEFER
4718 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4719 && !addr->message
4720 )
4721 {
4722 addr->basic_errno = ERRNO_HRETRY;
4723 if (continue_hostname)
4724 addr->message = US"no host found for existing SMTP connection";
4725 else if (expired)
4726 {
4727 setflag(addr, af_pass_message); /* This is not a security risk */
4728 addr->message = string_sprintf(
4729 "all hosts%s have been failing for a long time %s",
4730 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4731 ob->delay_after_cutoff
4732 ? US"(and retry time not reached)"
4733 : US"and were last tried after this message arrived");
4734
4735 /* If we are already using fallback hosts, or there are no fallback hosts
4736 defined, convert the result to FAIL to cause a bounce. */
4737
4738 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4739 addr->transport_return = FAIL;
4740 }
4741 else
4742 {
4743 const char * s;
4744 if (hosts_retry == hosts_total)
4745 s = "retry time not reached for any host%s";
4746 else if (hosts_fail == hosts_total)
4747 s = "all host address lookups%s failed permanently";
4748 else if (hosts_defer == hosts_total)
4749 s = "all host address lookups%s failed temporarily";
4750 else if (hosts_serial == hosts_total)
4751 s = "connection limit reached for all hosts%s";
4752 else if (hosts_fail+hosts_defer == hosts_total)
4753 s = "all host address lookups%s failed";
4754 else
4755 s = "some host address lookups failed and retry time "
4756 "not reached for other hosts or connection limit reached%s";
4757
4758 addr->message = string_sprintf(s,
4759 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4760 }
4761 }
4762 }
4763
4764 /* Update the database which keeps information about which messages are waiting
4765 for which hosts to become available. For some message-specific errors, the
4766 update_waiting flag is turned off because we don't want follow-on deliveries in
4767 those cases. If this transport instance is explicitly limited to one message
4768 per connection then follow-on deliveries are not possible and there's no need
4769 to create/update the per-transport wait-<transport_name> database. */
4770
4771 if (update_waiting && tblock->connection_max_messages != 1)
4772 transport_update_waiting(hostlist, tblock->name);
4773
4774 END_TRANSPORT:
4775
4776 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4777
4778 return TRUE; /* Each address has its status */
4779 }
4780
4781 #endif /*!MACRO_PREDEF*/
4782 /* vi: aw ai sw=2
4783 */
4784 /* End of transport/smtp.c */
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