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DANE: smtp transport option dane_require_tls_ciphers
[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 #endif
67 { "dns_qualify_single", opt_bool,
68 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
69 { "dns_search_parents", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
71 { "dnssec_request_domains", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
73 { "dnssec_require_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
75 { "dscp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dscp) },
77 { "fallback_hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
79 { "final_timeout", opt_time,
80 (void *)offsetof(smtp_transport_options_block, final_timeout) },
81 { "gethostbyname", opt_bool,
82 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
83 { "helo_data", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, helo_data) },
85 { "hosts", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts) },
87 { "hosts_avoid_esmtp", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
89 { "hosts_avoid_pipelining", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
91 #ifdef SUPPORT_TLS
92 { "hosts_avoid_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
94 #endif
95 { "hosts_max_try", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
97 { "hosts_max_try_hardlimit", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
99 #ifdef SUPPORT_TLS
100 { "hosts_nopass_tls", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
102 { "hosts_noproxy_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
104 #endif
105 { "hosts_override", opt_bool,
106 (void *)offsetof(smtp_transport_options_block, hosts_override) },
107 { "hosts_randomize", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
109 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
110 { "hosts_request_ocsp", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
112 #endif
113 { "hosts_require_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
115 #ifdef SUPPORT_TLS
116 # ifdef SUPPORT_DANE
117 { "hosts_require_dane", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
119 # endif
120 # ifndef DISABLE_OCSP
121 { "hosts_require_ocsp", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
123 # endif
124 { "hosts_require_tls", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
126 #endif
127 { "hosts_try_auth", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
129 { "hosts_try_chunking", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
131 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
132 { "hosts_try_dane", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
134 #endif
135 { "hosts_try_fastopen", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
137 #ifndef DISABLE_PRDR
138 { "hosts_try_prdr", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
140 #endif
141 #ifdef SUPPORT_TLS
142 { "hosts_verify_avoid_tls", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
144 #endif
145 { "interface", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, interface) },
147 { "keepalive", opt_bool,
148 (void *)offsetof(smtp_transport_options_block, keepalive) },
149 { "lmtp_ignore_quota", opt_bool,
150 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
151 { "max_rcpt", opt_int | opt_public,
152 (void *)offsetof(transport_instance, max_addresses) },
153 { "multi_domain", opt_expand_bool | opt_public,
154 (void *)offsetof(transport_instance, multi_domain) },
155 { "port", opt_stringptr,
156 (void *)offsetof(smtp_transport_options_block, port) },
157 { "protocol", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, protocol) },
159 { "retry_include_ip_address", opt_expand_bool,
160 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
161 { "serialize_hosts", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
163 { "size_addition", opt_int,
164 (void *)offsetof(smtp_transport_options_block, size_addition) }
165 #ifdef SUPPORT_SOCKS
166 ,{ "socks_proxy", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
168 #endif
169 #ifdef SUPPORT_TLS
170 ,{ "tls_certificate", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
172 { "tls_crl", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_crl) },
174 { "tls_dh_min_bits", opt_int,
175 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
176 { "tls_privatekey", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
178 { "tls_require_ciphers", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
180 { "tls_sni", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_sni) },
182 { "tls_tempfail_tryclear", opt_bool,
183 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
184 { "tls_try_verify_hosts", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
186 { "tls_verify_cert_hostnames", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
188 { "tls_verify_certificates", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
190 { "tls_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 #endif
193 };
194
195 /* Size of the options list. An extern variable has to be used so that its
196 address can appear in the tables drtables.c. */
197
198 int smtp_transport_options_count =
199 sizeof(smtp_transport_options)/sizeof(optionlist);
200
201
202 #ifdef MACRO_PREDEF
203
204 /* Dummy values */
205 smtp_transport_options_block smtp_transport_option_defaults = {0};
206 void smtp_transport_init(transport_instance *tblock) {}
207 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
208 void smtp_transport_closedown(transport_instance *tblock) {}
209
210 #else /*!MACRO_PREDEF*/
211
212
213 /* Default private options block for the smtp transport. */
214
215 smtp_transport_options_block smtp_transport_option_defaults = {
216 .hosts = NULL,
217 .fallback_hosts = NULL,
218 .hostlist = NULL,
219 .fallback_hostlist = NULL,
220 .helo_data = US"$primary_hostname",
221 .interface = NULL,
222 .port = NULL,
223 .protocol = US"smtp",
224 .dscp = NULL,
225 .serialize_hosts = NULL,
226 .hosts_try_auth = NULL,
227 .hosts_require_auth = NULL,
228 .hosts_try_chunking = US"*",
229 #ifdef SUPPORT_DANE
230 .hosts_try_dane = NULL,
231 .hosts_require_dane = NULL,
232 .dane_require_tls_ciphers = NULL,
233 #endif
234 .hosts_try_fastopen = NULL,
235 #ifndef DISABLE_PRDR
236 .hosts_try_prdr = US"*",
237 #endif
238 #ifndef DISABLE_OCSP
239 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
240 .hosts_require_ocsp = NULL,
241 #endif
242 .hosts_require_tls = NULL,
243 .hosts_avoid_tls = NULL,
244 .hosts_verify_avoid_tls = NULL,
245 .hosts_avoid_pipelining = NULL,
246 .hosts_avoid_esmtp = NULL,
247 #ifdef SUPPORT_TLS
248 .hosts_nopass_tls = NULL,
249 .hosts_noproxy_tls = US"*",
250 #endif
251 .command_timeout = 5*60,
252 .connect_timeout = 5*60,
253 .data_timeout = 5*60,
254 .final_timeout = 10*60,
255 .size_addition = 1024,
256 .hosts_max_try = 5,
257 .hosts_max_try_hardlimit = 50,
258 .address_retry_include_sender = TRUE,
259 .allow_localhost = FALSE,
260 .authenticated_sender_force = FALSE,
261 .gethostbyname = FALSE,
262 .dns_qualify_single = TRUE,
263 .dns_search_parents = FALSE,
264 .dnssec = { .request=NULL, .require=NULL },
265 .delay_after_cutoff = TRUE,
266 .hosts_override = FALSE,
267 .hosts_randomize = FALSE,
268 .keepalive = TRUE,
269 .lmtp_ignore_quota = FALSE,
270 .expand_retry_include_ip_address = NULL,
271 .retry_include_ip_address = TRUE,
272 #ifdef SUPPORT_SOCKS
273 .socks_proxy = NULL,
274 #endif
275 #ifdef SUPPORT_TLS
276 .tls_certificate = NULL,
277 .tls_crl = NULL,
278 .tls_privatekey = NULL,
279 .tls_require_ciphers = NULL,
280 .tls_sni = NULL,
281 .tls_verify_certificates = US"system",
282 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
283 .tls_tempfail_tryclear = TRUE,
284 .tls_verify_hosts = NULL,
285 .tls_try_verify_hosts = US"*",
286 .tls_verify_cert_hostnames = US"*",
287 #endif
288 #ifndef DISABLE_DKIM
289 .dkim =
290 {.dkim_domain = NULL,
291 .dkim_identity = NULL,
292 .dkim_private_key = NULL,
293 .dkim_selector = NULL,
294 .dkim_canon = NULL,
295 .dkim_sign_headers = NULL,
296 .dkim_strict = NULL,
297 .dkim_hash = US"sha256",
298 .dot_stuffed = FALSE,
299 .force_bodyhash = FALSE,
300 # ifdef EXPERIMENTAL_ARC
301 .arc_signspec = NULL,
302 # endif
303 },
304 # ifdef EXPERIMENTAL_ARC
305 .arc_sign = NULL,
306 # endif
307 #endif
308 };
309
310 /* some DSN flags for use later */
311
312 static int rf_list[] = {rf_notify_never, rf_notify_success,
313 rf_notify_failure, rf_notify_delay };
314
315 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
316
317
318
319 /* Local statics */
320
321 static uschar *smtp_command; /* Points to last cmd for error messages */
322 static uschar *mail_command; /* Points to MAIL cmd for error messages */
323 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
324 static BOOL update_waiting; /* TRUE to update the "wait" database */
325
326 /*XXX move to smtp_context */
327 static BOOL pipelining_active; /* current transaction is in pipe mode */
328
329
330 /*************************************************
331 * Setup entry point *
332 *************************************************/
333
334 /* This function is called when the transport is about to be used,
335 but before running it in a sub-process. It is used for two things:
336
337 (1) To set the fallback host list in addresses, when delivering.
338 (2) To pass back the interface, port, protocol, and other options, for use
339 during callout verification.
340
341 Arguments:
342 tblock pointer to the transport instance block
343 addrlist list of addresses about to be transported
344 tf if not NULL, pointer to block in which to return options
345 uid the uid that will be set (not used)
346 gid the gid that will be set (not used)
347 errmsg place for error message (not used)
348
349 Returns: OK always (FAIL, DEFER not used)
350 */
351
352 static int
353 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
354 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
355 {
356 smtp_transport_options_block *ob =
357 (smtp_transport_options_block *)(tblock->options_block);
358
359 errmsg = errmsg; /* Keep picky compilers happy */
360 uid = uid;
361 gid = gid;
362
363 /* Pass back options if required. This interface is getting very messy. */
364
365 if (tf)
366 {
367 tf->interface = ob->interface;
368 tf->port = ob->port;
369 tf->protocol = ob->protocol;
370 tf->hosts = ob->hosts;
371 tf->hosts_override = ob->hosts_override;
372 tf->hosts_randomize = ob->hosts_randomize;
373 tf->gethostbyname = ob->gethostbyname;
374 tf->qualify_single = ob->dns_qualify_single;
375 tf->search_parents = ob->dns_search_parents;
376 tf->helo_data = ob->helo_data;
377 }
378
379 /* Set the fallback host list for all the addresses that don't have fallback
380 host lists, provided that the local host wasn't present in the original host
381 list. */
382
383 if (!testflag(addrlist, af_local_host_removed))
384 for (; addrlist; addrlist = addrlist->next)
385 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
386
387 return OK;
388 }
389
390
391
392 /*************************************************
393 * Initialization entry point *
394 *************************************************/
395
396 /* Called for each instance, after its options have been read, to
397 enable consistency checks to be done, or anything else that needs
398 to be set up.
399
400 Argument: pointer to the transport instance block
401 Returns: nothing
402 */
403
404 void
405 smtp_transport_init(transport_instance *tblock)
406 {
407 smtp_transport_options_block *ob =
408 (smtp_transport_options_block *)(tblock->options_block);
409
410 /* Retry_use_local_part defaults FALSE if unset */
411
412 if (tblock->retry_use_local_part == TRUE_UNSET)
413 tblock->retry_use_local_part = FALSE;
414
415 /* Set the default port according to the protocol */
416
417 if (ob->port == NULL)
418 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
419 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
420
421 /* Set up the setup entry point, to be called before subprocesses for this
422 transport. */
423
424 tblock->setup = smtp_transport_setup;
425
426 /* Complain if any of the timeouts are zero. */
427
428 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
429 ob->final_timeout <= 0)
430 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
431 "command, data, or final timeout value is zero for %s transport",
432 tblock->name);
433
434 /* If hosts_override is set and there are local hosts, set the global
435 flag that stops verify from showing router hosts. */
436
437 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
438
439 /* If there are any fallback hosts listed, build a chain of host items
440 for them, but do not do any lookups at this time. */
441
442 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
443 }
444
445
446
447
448
449 /*************************************************
450 * Set delivery info into all active addresses *
451 *************************************************/
452
453 /* Only addresses whose status is >= PENDING are relevant. A lesser
454 status means that an address is not currently being processed.
455
456 Arguments:
457 addrlist points to a chain of addresses
458 errno_value to put in each address's errno field
459 msg to put in each address's message field
460 rc to put in each address's transport_return field
461 pass_message if TRUE, set the "pass message" flag in the address
462 host if set, mark addrs as having used this host
463 smtp_greeting from peer
464 helo_response from peer
465
466 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
467 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
468 this particular type of timeout.
469
470 Returns: nothing
471 */
472
473 static void
474 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
475 BOOL pass_message, host_item * host
476 #ifdef EXPERIMENTAL_DSN_INFO
477 , const uschar * smtp_greeting, const uschar * helo_response
478 #endif
479 )
480 {
481 address_item *addr;
482 int orvalue = 0;
483 if (errno_value == ERRNO_CONNECTTIMEOUT)
484 {
485 errno_value = ETIMEDOUT;
486 orvalue = RTEF_CTOUT;
487 }
488 for (addr = addrlist; addr; addr = addr->next)
489 if (addr->transport_return >= PENDING)
490 {
491 addr->basic_errno = errno_value;
492 addr->more_errno |= orvalue;
493 if (msg)
494 {
495 addr->message = msg;
496 if (pass_message) setflag(addr, af_pass_message);
497 }
498 addr->transport_return = rc;
499 if (host)
500 {
501 addr->host_used = host;
502 #ifdef EXPERIMENTAL_DSN_INFO
503 if (smtp_greeting)
504 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
505 addr->smtp_greeting = smtp_greeting;
506
507 if (helo_response)
508 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
509 addr->helo_response = helo_response;
510 #endif
511 }
512 }
513 }
514
515 static void
516 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
517 BOOL pass_message)
518 {
519 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
520 #ifdef EXPERIMENTAL_DSN_INFO
521 , NULL, NULL
522 #endif
523 );
524 }
525
526
527 /*************************************************
528 * Check an SMTP response *
529 *************************************************/
530
531 /* This function is given an errno code and the SMTP response buffer
532 to analyse, together with the host identification for generating messages. It
533 sets an appropriate message and puts the first digit of the response code into
534 the yield variable. If no response was actually read, a suitable digit is
535 chosen.
536
537 Arguments:
538 host the current host, to get its name for messages
539 errno_value pointer to the errno value
540 more_errno from the top address for use with ERRNO_FILTER_FAIL
541 buffer the SMTP response buffer
542 yield where to put a one-digit SMTP response code
543 message where to put an error message
544 pass_message set TRUE if message is an SMTP response
545
546 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
547 */
548
549 static BOOL
550 check_response(host_item *host, int *errno_value, int more_errno,
551 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
552 {
553 uschar * pl = pipelining_active ? US"pipelined " : US"";
554 const uschar * s;
555
556 *yield = '4'; /* Default setting is to give a temporary error */
557
558 switch(*errno_value)
559 {
560 case ETIMEDOUT: /* Handle response timeout */
561 *message = US string_sprintf("SMTP timeout after %s%s",
562 pl, smtp_command);
563 if (transport_count > 0)
564 *message = US string_sprintf("%s (%d bytes written)", *message,
565 transport_count);
566 return FALSE;
567
568 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
569 s = string_printing(buffer);
570 while (isspace(*s)) s++;
571 *message = *s == 0
572 ? string_sprintf("Malformed SMTP reply (an empty line) "
573 "in response to %s%s", pl, smtp_command)
574 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
575 pl, smtp_command, s);
576 return FALSE;
577
578 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
579 can't send QUIT as we mustn't end the DATA. */
580 *message = string_sprintf("transport filter process failed (%d)%s",
581 more_errno,
582 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
583 return FALSE;
584
585 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
586 can't send QUIT as we mustn't end the DATA. */
587 *message =
588 string_sprintf("failed to expand headers_add or headers_remove: %s",
589 expand_string_message);
590 return FALSE;
591
592 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
593 *message = string_sprintf("failed to write a data block");
594 return FALSE;
595
596 #ifdef SUPPORT_I18N
597 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
598 *message = US"utf8 support required but not offered for forwarding";
599 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
600 return TRUE;
601 #endif
602 }
603
604 /* Handle error responses from the remote mailer. */
605
606 if (buffer[0] != 0)
607 {
608 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
609 "%s", pl, smtp_command, s = string_printing(buffer));
610 *pass_message = TRUE;
611 *yield = buffer[0];
612 return TRUE;
613 }
614
615 /* No data was read. If there is no errno, this must be the EOF (i.e.
616 connection closed) case, which causes deferral. An explicit connection reset
617 error has the same effect. Otherwise, put the host's identity in the message,
618 leaving the errno value to be interpreted as well. In all cases, we have to
619 assume the connection is now dead. */
620
621 if (*errno_value == 0 || *errno_value == ECONNRESET)
622 {
623 *errno_value = ERRNO_SMTPCLOSED;
624 *message = US string_sprintf("Remote host closed connection "
625 "in response to %s%s", pl, smtp_command);
626 }
627 else
628 *message = US string_sprintf("%s [%s]", host->name, host->address);
629
630 return FALSE;
631 }
632
633
634
635 /*************************************************
636 * Write error message to logs *
637 *************************************************/
638
639 /* This writes to the main log and to the message log.
640
641 Arguments:
642 host the current host
643 detail the current message (addr_item->message)
644 basic_errno the errno (addr_item->basic_errno)
645
646 Returns: nothing
647 */
648
649 static void
650 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
651 {
652
653
654 uschar *message = LOGGING(outgoing_port)
655 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
656 host->port == PORT_NONE ? 25 : host->port)
657 : string_sprintf("H=%s [%s]", host->name, host->address);
658
659 if (suffix)
660 {
661 message = string_sprintf("%s: %s", message, suffix);
662 if (basic_errno > 0)
663 message = string_sprintf("%s: %s", message, strerror(basic_errno));
664 }
665 else
666 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
667
668 log_write(0, LOG_MAIN, "%s", message);
669 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
670 }
671
672 static void
673 msglog_line(host_item * host, uschar * message)
674 {
675 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
676 host->name, host->address, message);
677 }
678
679
680
681 #ifndef DISABLE_EVENT
682 /*************************************************
683 * Post-defer action *
684 *************************************************/
685
686 /* This expands an arbitrary per-transport string.
687 It might, for example, be used to write to the database log.
688
689 Arguments:
690 addr the address item containing error information
691 host the current host
692
693 Returns: nothing
694 */
695
696 static void
697 deferred_event_raise(address_item *addr, host_item *host)
698 {
699 uschar * action = addr->transport->event_action;
700 const uschar * save_domain;
701 uschar * save_local;
702
703 if (!action)
704 return;
705
706 save_domain = deliver_domain;
707 save_local = deliver_localpart;
708
709 /*XXX would ip & port already be set up? */
710 deliver_host_address = string_copy(host->address);
711 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
712 event_defer_errno = addr->basic_errno;
713
714 router_name = addr->router->name;
715 transport_name = addr->transport->name;
716 deliver_domain = addr->domain;
717 deliver_localpart = addr->local_part;
718
719 (void) event_raise(action, US"msg:host:defer",
720 addr->message
721 ? addr->basic_errno > 0
722 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
723 : string_copy(addr->message)
724 : addr->basic_errno > 0
725 ? string_copy(US strerror(addr->basic_errno))
726 : NULL);
727
728 deliver_localpart = save_local;
729 deliver_domain = save_domain;
730 router_name = transport_name = NULL;
731 }
732 #endif
733
734 /*************************************************
735 * Synchronize SMTP responses *
736 *************************************************/
737
738 /* This function is called from smtp_deliver() to receive SMTP responses from
739 the server, and match them up with the commands to which they relate. When
740 PIPELINING is not in use, this function is called after every command, and is
741 therefore somewhat over-engineered, but it is simpler to use a single scheme
742 that works both with and without PIPELINING instead of having two separate sets
743 of code.
744
745 The set of commands that are buffered up with pipelining may start with MAIL
746 and may end with DATA; in between are RCPT commands that correspond to the
747 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
748 etc.) are never buffered.
749
750 Errors after MAIL or DATA abort the whole process leaving the response in the
751 buffer. After MAIL, pending responses are flushed, and the original command is
752 re-instated in big_buffer for error messages. For RCPT commands, the remote is
753 permitted to reject some recipient addresses while accepting others. However
754 certain errors clearly abort the whole process. Set the value in
755 transport_return to PENDING_OK if the address is accepted. If there is a
756 subsequent general error, it will get reset accordingly. If not, it will get
757 converted to OK at the end.
758
759 Arguments:
760 sx smtp connection context
761 count the number of responses to read
762 pending_DATA 0 if last command sent was not DATA
763 +1 if previously had a good recipient
764 -1 if not previously had a good recipient
765
766 Returns: 3 if at least one address had 2xx and one had 5xx
767 2 if at least one address had 5xx but none had 2xx
768 1 if at least one host had a 2xx response, but none had 5xx
769 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
770 -1 timeout while reading RCPT response
771 -2 I/O or other non-response error for RCPT
772 -3 DATA or MAIL failed - errno and buffer set
773 */
774
775 static int
776 sync_responses(smtp_context * sx, int count, int pending_DATA)
777 {
778 address_item *addr = sx->sync_addr;
779 smtp_transport_options_block *ob =
780 (smtp_transport_options_block *)sx->tblock->options_block;
781 int yield = 0;
782
783 /* Handle the response for a MAIL command. On error, reinstate the original
784 command in big_buffer for error message use, and flush any further pending
785 responses before returning, except after I/O errors and timeouts. */
786
787 if (sx->pending_MAIL)
788 {
789 count--;
790 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
791 '2', ob->command_timeout))
792 {
793 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
794 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
795 if (errno == 0 && sx->buffer[0] != 0)
796 {
797 uschar flushbuffer[4096];
798 int save_errno = 0;
799 if (sx->buffer[0] == '4')
800 {
801 save_errno = ERRNO_MAIL4XX;
802 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
803 }
804 while (count-- > 0)
805 {
806 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
807 '2', ob->command_timeout)
808 && (errno != 0 || flushbuffer[0] == 0))
809 break;
810 }
811 errno = save_errno;
812 }
813
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
815 while (count-- > 0) /* Mark any pending addrs with the host used */
816 {
817 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
818 addr->host_used = sx->host;
819 addr = addr->next;
820 }
821 return -3;
822 }
823 }
824
825 if (pending_DATA) count--; /* Number of RCPT responses to come */
826
827 /* Read and handle the required number of RCPT responses, matching each one up
828 with an address by scanning for the next address whose status is PENDING_DEFER.
829 */
830
831 while (count-- > 0)
832 {
833 while (addr->transport_return != PENDING_DEFER)
834 if (!(addr = addr->next))
835 return -2;
836
837 /* The address was accepted */
838 addr->host_used = sx->host;
839
840 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
841 '2', ob->command_timeout))
842 {
843 yield |= 1;
844 addr->transport_return = PENDING_OK;
845
846 /* If af_dr_retry_exists is set, there was a routing delay on this address;
847 ensure that any address-specific retry record is expunged. We do this both
848 for the basic key and for the version that also includes the sender. */
849
850 if (testflag(addr, af_dr_retry_exists))
851 {
852 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
853 sender_address);
854 retry_add_item(addr, altkey, rf_delete);
855 retry_add_item(addr, addr->address_retry_key, rf_delete);
856 }
857 }
858
859 /* Timeout while reading the response */
860
861 else if (errno == ETIMEDOUT)
862 {
863 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
864 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
865 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
866 retry_add_item(addr, addr->address_retry_key, 0);
867 update_waiting = FALSE;
868 return -1;
869 }
870
871 /* Handle other errors in obtaining an SMTP response by returning -1. This
872 will cause all the addresses to be deferred. Restore the SMTP command in
873 big_buffer for which we are checking the response, so the error message
874 makes sense. */
875
876 else if (errno != 0 || sx->buffer[0] == 0)
877 {
878 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
879 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
880 return -2;
881 }
882
883 /* Handle SMTP permanent and temporary response codes. */
884
885 else
886 {
887 addr->message =
888 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
889 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
890 string_printing(sx->buffer));
891 setflag(addr, af_pass_message);
892 if (!sx->verify)
893 msglog_line(sx->host, addr->message);
894
895 /* The response was 5xx */
896
897 if (sx->buffer[0] == '5')
898 {
899 addr->transport_return = FAIL;
900 yield |= 2;
901 }
902
903 /* The response was 4xx */
904
905 else
906 {
907 addr->transport_return = DEFER;
908 addr->basic_errno = ERRNO_RCPT4XX;
909 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
910
911 if (!sx->verify)
912 {
913 #ifndef DISABLE_EVENT
914 event_defer_errno = addr->more_errno;
915 msg_event_raise(US"msg:rcpt:host:defer", addr);
916 #endif
917
918 /* Log temporary errors if there are more hosts to be tried.
919 If not, log this last one in the == line. */
920
921 if (sx->host->next)
922 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
923 sx->host->name, sx->host->address, addr->message);
924
925 #ifndef DISABLE_EVENT
926 else
927 msg_event_raise(US"msg:rcpt:defer", addr);
928 #endif
929
930 /* Do not put this message on the list of those waiting for specific
931 hosts, as otherwise it is likely to be tried too often. */
932
933 update_waiting = FALSE;
934
935 /* Add a retry item for the address so that it doesn't get tried again
936 too soon. If address_retry_include_sender is true, add the sender address
937 to the retry key. */
938
939 retry_add_item(addr,
940 ob->address_retry_include_sender
941 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
942 : addr->address_retry_key,
943 0);
944 }
945 }
946 }
947 } /* Loop for next RCPT response */
948
949 /* Update where to start at for the next block of responses, unless we
950 have already handled all the addresses. */
951
952 if (addr) sx->sync_addr = addr->next;
953
954 /* Handle a response to DATA. If we have not had any good recipients, either
955 previously or in this block, the response is ignored. */
956
957 if (pending_DATA != 0 &&
958 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
959 '3', ob->command_timeout))
960 {
961 int code;
962 uschar *msg;
963 BOOL pass_message;
964 if (pending_DATA > 0 || (yield & 1) != 0)
965 {
966 if (errno == 0 && sx->buffer[0] == '4')
967 {
968 errno = ERRNO_DATA4XX;
969 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
970 }
971 return -3;
972 }
973 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
974 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
975 "is in use and there were no good recipients\n", msg);
976 }
977
978 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
979 present) received 3xx. If any RCPTs were handled and yielded anything other
980 than 4xx, yield will be set non-zero. */
981
982 return yield;
983 }
984
985
986
987 /* Do the client side of smtp-level authentication */
988 /*
989 Arguments:
990 buffer EHLO response from server (gets overwritten)
991 addrlist chain of potential addresses to deliver
992 host host to deliver to
993 ob transport options
994 ibp, obp comms channel control blocks
995
996 Returns:
997 OK Success, or failed (but not required): global "smtp_authenticated" set
998 DEFER Failed authentication (and was required)
999 ERROR Internal problem
1000
1001 FAIL_SEND Failed communications - transmit
1002 FAIL - response
1003 */
1004
1005 int
1006 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1007 smtp_transport_options_block *ob, BOOL is_esmtp,
1008 smtp_inblock *ibp, smtp_outblock *obp)
1009 {
1010 int require_auth;
1011 uschar *fail_reason = US"server did not advertise AUTH support";
1012
1013 smtp_authenticated = FALSE;
1014 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1015 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1016
1017 if (is_esmtp && !regex_AUTH) regex_AUTH =
1018 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1019 FALSE, TRUE);
1020
1021 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1022 {
1023 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1024 expand_nmax = -1; /* reset */
1025
1026 /* Must not do this check until after we have saved the result of the
1027 regex match above. */
1028
1029 if (require_auth == OK ||
1030 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1031 {
1032 auth_instance *au;
1033 fail_reason = US"no common mechanisms were found";
1034
1035 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1036
1037 /* Scan the configured authenticators looking for one which is configured
1038 for use as a client, which is not suppressed by client_condition, and
1039 whose name matches an authentication mechanism supported by the server.
1040 If one is found, attempt to authenticate by calling its client function.
1041 */
1042
1043 for (au = auths; !smtp_authenticated && au; au = au->next)
1044 {
1045 uschar *p = names;
1046 if (!au->client ||
1047 (au->client_condition != NULL &&
1048 !expand_check_condition(au->client_condition, au->name,
1049 US"client authenticator")))
1050 {
1051 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1052 au->name,
1053 (au->client)? "client_condition is false" :
1054 "not configured as a client");
1055 continue;
1056 }
1057
1058 /* Loop to scan supported server mechanisms */
1059
1060 while (*p)
1061 {
1062 int rc;
1063 int len = Ustrlen(au->public_name);
1064 while (isspace(*p)) p++;
1065
1066 if (strncmpic(au->public_name, p, len) != 0 ||
1067 (p[len] != 0 && !isspace(p[len])))
1068 {
1069 while (*p != 0 && !isspace(*p)) p++;
1070 continue;
1071 }
1072
1073 /* Found data for a listed mechanism. Call its client entry. Set
1074 a flag in the outblock so that data is overwritten after sending so
1075 that reflections don't show it. */
1076
1077 fail_reason = US"authentication attempt(s) failed";
1078 obp->authenticating = TRUE;
1079 rc = (au->info->clientcode)(au, ibp, obp,
1080 ob->command_timeout, buffer, bufsize);
1081 obp->authenticating = FALSE;
1082 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1083 au->name, rc);
1084
1085 /* A temporary authentication failure must hold up delivery to
1086 this host. After a permanent authentication failure, we carry on
1087 to try other authentication methods. If all fail hard, try to
1088 deliver the message unauthenticated unless require_auth was set. */
1089
1090 switch(rc)
1091 {
1092 case OK:
1093 smtp_authenticated = TRUE; /* stops the outer loop */
1094 client_authenticator = au->name;
1095 if (au->set_client_id != NULL)
1096 client_authenticated_id = expand_string(au->set_client_id);
1097 break;
1098
1099 /* Failure after writing a command */
1100
1101 case FAIL_SEND:
1102 return FAIL_SEND;
1103
1104 /* Failure after reading a response */
1105
1106 case FAIL:
1107 if (errno != 0 || buffer[0] != '5') return FAIL;
1108 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1109 au->name, host->name, host->address, buffer);
1110 break;
1111
1112 /* Failure by some other means. In effect, the authenticator
1113 decided it wasn't prepared to handle this case. Typically this
1114 is the result of "fail" in an expansion string. Do we need to
1115 log anything here? Feb 2006: a message is now put in the buffer
1116 if logging is required. */
1117
1118 case CANCELLED:
1119 if (*buffer != 0)
1120 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1121 "authentication H=%s [%s] %s", au->name, host->name,
1122 host->address, buffer);
1123 break;
1124
1125 /* Internal problem, message in buffer. */
1126
1127 case ERROR:
1128 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1129 DEFER, FALSE);
1130 return ERROR;
1131 }
1132
1133 break; /* If not authenticated, try next authenticator */
1134 } /* Loop for scanning supported server mechanisms */
1135 } /* Loop for further authenticators */
1136 }
1137 }
1138
1139 /* If we haven't authenticated, but are required to, give up. */
1140
1141 if (require_auth == OK && !smtp_authenticated)
1142 {
1143 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1144 string_sprintf("authentication required but %s", fail_reason), DEFER,
1145 FALSE);
1146 return DEFER;
1147 }
1148
1149 return OK;
1150 }
1151
1152
1153 /* Construct AUTH appendix string for MAIL TO */
1154 /*
1155 Arguments
1156 buffer to build string
1157 addrlist chain of potential addresses to deliver
1158 ob transport options
1159
1160 Globals smtp_authenticated
1161 client_authenticated_sender
1162 Return True on error, otherwise buffer has (possibly empty) terminated string
1163 */
1164
1165 BOOL
1166 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1167 smtp_transport_options_block *ob)
1168 {
1169 uschar *local_authenticated_sender = authenticated_sender;
1170
1171 #ifdef notdef
1172 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1173 #endif
1174
1175 if (ob->authenticated_sender != NULL)
1176 {
1177 uschar *new = expand_string(ob->authenticated_sender);
1178 if (new == NULL)
1179 {
1180 if (!expand_string_forcedfail)
1181 {
1182 uschar *message = string_sprintf("failed to expand "
1183 "authenticated_sender: %s", expand_string_message);
1184 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1185 return TRUE;
1186 }
1187 }
1188 else if (new[0] != 0) local_authenticated_sender = new;
1189 }
1190
1191 /* Add the authenticated sender address if present */
1192
1193 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1194 local_authenticated_sender != NULL)
1195 {
1196 string_format(buffer, bufsize, " AUTH=%s",
1197 auth_xtextencode(local_authenticated_sender,
1198 Ustrlen(local_authenticated_sender)));
1199 client_authenticated_sender = string_copy(local_authenticated_sender);
1200 }
1201 else
1202 *buffer= 0;
1203
1204 return FALSE;
1205 }
1206
1207
1208
1209 #ifdef SUPPORT_DANE
1210 /* Lookup TLSA record for host/port.
1211 Return: OK success with dnssec; DANE mode
1212 DEFER Do not use this host now, may retry later
1213 FAIL_FORCED No TLSA record; DANE not usable
1214 FAIL Do not use this connection
1215 */
1216
1217 int
1218 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1219 {
1220 /* move this out to host.c given the similarity to dns_lookup() ? */
1221 uschar buffer[300];
1222 const uschar * fullname = buffer;
1223 int rc;
1224 BOOL sec;
1225
1226 /* TLSA lookup string */
1227 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1228
1229 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1230 sec = dns_is_secure(dnsa);
1231 DEBUG(D_transport)
1232 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1233
1234 switch (rc)
1235 {
1236 case DNS_AGAIN:
1237 return DEFER; /* just defer this TLS'd conn */
1238
1239 case DNS_SUCCEED:
1240 if (sec) return OK;
1241 log_write(0, LOG_MAIN,
1242 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1243 /*FALLTRHOUGH*/
1244
1245 case DNS_NODATA: /* no TLSA RR for this lookup */
1246 case DNS_NOMATCH: /* no records at all for this lookup */
1247 return dane_required ? FAIL : FAIL_FORCED;
1248
1249 default:
1250 case DNS_FAIL:
1251 return dane_required ? FAIL : DEFER;
1252 }
1253 }
1254 #endif
1255
1256
1257
1258 typedef struct smtp_compare_s
1259 {
1260 uschar *current_sender_address;
1261 struct transport_instance *tblock;
1262 } smtp_compare_t;
1263
1264
1265 /* Create a unique string that identifies this message, it is based on
1266 sender_address, helo_data and tls_certificate if enabled.
1267 */
1268
1269 static uschar *
1270 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1271 {
1272 address_item * addr1;
1273 uschar * if1 = US"";
1274 uschar * helo1 = US"";
1275 #ifdef SUPPORT_TLS
1276 uschar * tlsc1 = US"";
1277 #endif
1278 uschar * save_sender_address = sender_address;
1279 uschar * local_identity = NULL;
1280 smtp_transport_options_block * ob =
1281 (smtp_transport_options_block *)tblock->options_block;
1282
1283 sender_address = sender;
1284
1285 addr1 = deliver_make_addr (sender, TRUE);
1286 deliver_set_expansions(addr1);
1287
1288 if (ob->interface)
1289 if1 = expand_string(ob->interface);
1290
1291 if (ob->helo_data)
1292 helo1 = expand_string(ob->helo_data);
1293
1294 #ifdef SUPPORT_TLS
1295 if (ob->tls_certificate)
1296 tlsc1 = expand_string(ob->tls_certificate);
1297 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1298 #else
1299 local_identity = string_sprintf ("%s^%s", if1, helo1);
1300 #endif
1301
1302 deliver_set_expansions(NULL);
1303 sender_address = save_sender_address;
1304
1305 return local_identity;
1306 }
1307
1308
1309
1310 /* This routine is a callback that is called from transport_check_waiting.
1311 This function will evaluate the incoming message versus the previous
1312 message. If the incoming message is using a different local identity then
1313 we will veto this new message. */
1314
1315 static BOOL
1316 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1317 {
1318 uschar * message_local_identity,
1319 * current_local_identity,
1320 * new_sender_address;
1321
1322 current_local_identity =
1323 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1324
1325 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1326 return 0;
1327
1328 message_local_identity =
1329 smtp_local_identity(new_sender_address, s_compare->tblock);
1330
1331 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1332 }
1333
1334
1335
1336 static uschar
1337 ehlo_response(uschar * buf, uschar checks)
1338 {
1339 size_t bsize = Ustrlen(buf);
1340
1341 #ifdef SUPPORT_TLS
1342 if ( checks & OPTION_TLS
1343 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~OPTION_TLS;
1345 #endif
1346
1347 if ( checks & OPTION_IGNQ
1348 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1349 PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~OPTION_IGNQ;
1351
1352 if ( checks & OPTION_CHUNKING
1353 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~OPTION_CHUNKING;
1355
1356 #ifndef DISABLE_PRDR
1357 if ( checks & OPTION_PRDR
1358 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~OPTION_PRDR;
1360 #endif
1361
1362 #ifdef SUPPORT_I18N
1363 if ( checks & OPTION_UTF8
1364 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~OPTION_UTF8;
1366 #endif
1367
1368 if ( checks & OPTION_DSN
1369 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~OPTION_DSN;
1371
1372 if ( checks & OPTION_PIPE
1373 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1374 PCRE_EOPT, NULL, 0) < 0)
1375 checks &= ~OPTION_PIPE;
1376
1377 if ( checks & OPTION_SIZE
1378 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1379 checks &= ~OPTION_SIZE;
1380
1381 return checks;
1382 }
1383
1384
1385
1386 /* Callback for emitting a BDAT data chunk header.
1387
1388 If given a nonzero size, first flush any buffered SMTP commands
1389 then emit the command.
1390
1391 Reap previous SMTP command responses if requested, and always reap
1392 the response from a previous BDAT command.
1393
1394 Args:
1395 tctx transport context
1396 chunk_size value for SMTP BDAT command
1397 flags
1398 tc_chunk_last add LAST option to SMTP BDAT command
1399 tc_reap_prev reap response to previous SMTP commands
1400
1401 Returns: OK or ERROR
1402 */
1403
1404 static int
1405 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1406 unsigned flags)
1407 {
1408 smtp_transport_options_block * ob =
1409 (smtp_transport_options_block *)(tctx->tblock->options_block);
1410 smtp_context * sx = tctx->smtp_context;
1411 int cmd_count = 0;
1412 int prev_cmd_count;
1413
1414 /* Write SMTP chunk header command. If not reaping responses, note that
1415 there may be more writes (like, the chunk data) done soon. */
1416
1417 if (chunk_size > 0)
1418 {
1419 if((cmd_count = smtp_write_command(&sx->outblock,
1420 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1421 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1422 ) < 0) return ERROR;
1423 if (flags & tc_chunk_last)
1424 data_command = string_copy(big_buffer); /* Save for later error message */
1425 }
1426
1427 prev_cmd_count = cmd_count += sx->cmd_count;
1428
1429 /* Reap responses for any previous, but not one we just emitted */
1430
1431 if (chunk_size > 0)
1432 prev_cmd_count--;
1433 if (sx->pending_BDAT)
1434 prev_cmd_count--;
1435
1436 if (flags & tc_reap_prev && prev_cmd_count > 0)
1437 {
1438 DEBUG(D_transport) debug_printf("look for %d responses"
1439 " for previous pipelined cmds\n", prev_cmd_count);
1440
1441 switch(sync_responses(sx, prev_cmd_count, 0))
1442 {
1443 case 1: /* 2xx (only) => OK */
1444 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1445 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1446 case 0: break; /* No 2xx or 5xx, but no probs */
1447
1448 case -1: /* Timeout on RCPT */
1449 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1450 }
1451 cmd_count = 1;
1452 if (!sx->pending_BDAT)
1453 pipelining_active = FALSE;
1454 }
1455
1456 /* Reap response for an outstanding BDAT */
1457
1458 if (sx->pending_BDAT)
1459 {
1460 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1461
1462 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1463 ob->command_timeout))
1464 {
1465 if (errno == 0 && sx->buffer[0] == '4')
1466 {
1467 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1468 sx->addrlist->more_errno |=
1469 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1470 }
1471 return ERROR;
1472 }
1473 cmd_count--;
1474 sx->pending_BDAT = FALSE;
1475 pipelining_active = FALSE;
1476 }
1477 else if (chunk_size > 0)
1478 sx->pending_BDAT = TRUE;
1479
1480
1481 sx->cmd_count = cmd_count;
1482 return OK;
1483 }
1484
1485
1486
1487 /*************************************************
1488 * Make connection for given message *
1489 *************************************************/
1490
1491 /*
1492 Arguments:
1493 ctx connection context
1494 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1495 a second attempt after TLS initialization fails
1496
1497 Returns: OK - the connection was made and the delivery attempted;
1498 fd is set in the conn context, tls_out set up.
1499 DEFER - the connection could not be made, or something failed
1500 while setting up the SMTP session, or there was a
1501 non-message-specific error, such as a timeout.
1502 ERROR - helo_data or add_headers or authenticated_sender is
1503 specified for this transport, and the string failed
1504 to expand
1505 */
1506 int
1507 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1508 {
1509 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1510 dns_answer tlsa_dnsa;
1511 #endif
1512 BOOL pass_message = FALSE;
1513 uschar * message = NULL;
1514 int yield = OK;
1515 int rc;
1516
1517 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1518
1519 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1520 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1521 sx->ok = FALSE;
1522 sx->send_rset = TRUE;
1523 sx->send_quit = TRUE;
1524 sx->setting_up = TRUE;
1525 sx->esmtp = TRUE;
1526 sx->esmtp_sent = FALSE;
1527 #ifdef SUPPORT_I18N
1528 sx->utf8_needed = FALSE;
1529 #endif
1530 sx->dsn_all_lasthop = TRUE;
1531 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1532 sx->dane = FALSE;
1533 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1534 #endif
1535
1536 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1537 sx->peer_offered = 0;
1538 sx->avoid_option = 0;
1539 sx->igquotstr = US"";
1540 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1541 #ifdef EXPERIMENTAL_DSN_INFO
1542 sx->smtp_greeting = NULL;
1543 sx->helo_response = NULL;
1544 #endif
1545
1546 smtp_command = US"initial connection";
1547 sx->buffer[0] = '\0';
1548
1549 /* Set up the buffer for reading SMTP response packets. */
1550
1551 sx->inblock.buffer = sx->inbuffer;
1552 sx->inblock.buffersize = sizeof(sx->inbuffer);
1553 sx->inblock.ptr = sx->inbuffer;
1554 sx->inblock.ptrend = sx->inbuffer;
1555
1556 /* Set up the buffer for holding SMTP commands while pipelining */
1557
1558 sx->outblock.buffer = sx->outbuffer;
1559 sx->outblock.buffersize = sizeof(sx->outbuffer);
1560 sx->outblock.ptr = sx->outbuffer;
1561 sx->outblock.cmd_count = 0;
1562 sx->outblock.authenticating = FALSE;
1563
1564 /* Reset the parameters of a TLS session. */
1565
1566 tls_out.bits = 0;
1567 tls_out.cipher = NULL; /* the one we may use for this transport */
1568 tls_out.ourcert = NULL;
1569 tls_out.peercert = NULL;
1570 tls_out.peerdn = NULL;
1571 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1572 tls_out.sni = NULL;
1573 #endif
1574 tls_out.ocsp = OCSP_NOT_REQ;
1575
1576 /* Flip the legacy TLS-related variables over to the outbound set in case
1577 they're used in the context of the transport. Don't bother resetting
1578 afterward (when being used by a transport) as we're in a subprocess.
1579 For verify, unflipped once the callout is dealt with */
1580
1581 tls_modify_variables(&tls_out);
1582
1583 #ifndef SUPPORT_TLS
1584 if (sx->smtps)
1585 {
1586 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1587 DEFER, FALSE);
1588 return ERROR;
1589 }
1590 #endif
1591
1592 /* Make a connection to the host if this isn't a continued delivery, and handle
1593 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1594 specially so they can be identified for retries. */
1595
1596 if (!continue_hostname)
1597 {
1598 if (sx->verify)
1599 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1600
1601 /* Get the actual port the connection will use, into sx->host */
1602
1603 smtp_port_for_connect(sx->host, sx->port);
1604
1605 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1606 /* Do TLSA lookup for DANE */
1607 {
1608 tls_out.dane_verified = FALSE;
1609 tls_out.tlsa_usage = 0;
1610
1611 if (sx->host->dnssec == DS_YES)
1612 {
1613 if( sx->dane_required
1614 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1615 )
1616 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1617 {
1618 case OK: sx->dane = TRUE;
1619 sx->ob->tls_tempfail_tryclear = FALSE;
1620 break;
1621 case FAIL_FORCED: break;
1622 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1623 string_sprintf("DANE error: tlsa lookup %s",
1624 rc == DEFER ? "DEFER" : "FAIL"),
1625 rc, FALSE);
1626 (void) event_raise(sx->tblock->event_action,
1627 US"dane:fail", sx->dane_required
1628 ? US"dane-required" : US"dnssec-invalid");
1629 return rc;
1630 }
1631 }
1632 else if (sx->dane_required)
1633 {
1634 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1635 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1636 FAIL, FALSE);
1637 (void) event_raise(sx->tblock->event_action,
1638 US"dane:fail", US"dane-required");
1639 return FAIL;
1640 }
1641 }
1642 #endif /*DANE*/
1643
1644 /* Make the TCP connection */
1645
1646 sx->inblock.sock = sx->outblock.sock =
1647 smtp_connect(sx->host, sx->host_af, sx->interface,
1648 sx->ob->connect_timeout, sx->tblock);
1649
1650 if (sx->inblock.sock < 0)
1651 {
1652 uschar * msg = NULL;
1653 if (sx->verify)
1654 {
1655 msg = US strerror(errno);
1656 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1657 }
1658 set_errno_nohost(sx->addrlist,
1659 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1660 sx->verify ? string_sprintf("could not connect: %s", msg)
1661 : NULL,
1662 DEFER, FALSE);
1663 sx->send_quit = FALSE;
1664 return DEFER;
1665 }
1666
1667 /* Expand the greeting message while waiting for the initial response. (Makes
1668 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1669 delayed till here so that $sending_interface and $sending_port are set. */
1670
1671 if (sx->helo_data)
1672 if (!(sx->helo_data = expand_string(sx->helo_data)))
1673 if (sx->verify)
1674 log_write(0, LOG_MAIN|LOG_PANIC,
1675 "<%s>: failed to expand transport's helo_data value for callout: %s",
1676 sx->addrlist->address, expand_string_message);
1677
1678 #ifdef SUPPORT_I18N
1679 if (sx->helo_data)
1680 {
1681 expand_string_message = NULL;
1682 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1683 &expand_string_message)),
1684 expand_string_message)
1685 if (sx->verify)
1686 log_write(0, LOG_MAIN|LOG_PANIC,
1687 "<%s>: failed to expand transport's helo_data value for callout: %s",
1688 sx->addrlist->address, expand_string_message);
1689 else
1690 sx->helo_data = NULL;
1691 }
1692 #endif
1693
1694 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1695 is nevertheless a reasonably clean way of programming this kind of logic,
1696 where you want to escape on any error. */
1697
1698 if (!sx->smtps)
1699 {
1700 BOOL good_response;
1701
1702 #ifdef TCP_QUICKACK
1703 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1704 #endif
1705 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1706 '2', sx->ob->command_timeout);
1707 #ifdef EXPERIMENTAL_DSN_INFO
1708 sx->smtp_greeting = string_copy(sx->buffer);
1709 #endif
1710 if (!good_response) goto RESPONSE_FAILED;
1711
1712 #ifndef DISABLE_EVENT
1713 {
1714 uschar * s;
1715 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1716 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1717 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1718 if (s)
1719 {
1720 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1721 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1722 DEFER, FALSE);
1723 yield = DEFER;
1724 goto SEND_QUIT;
1725 }
1726 }
1727 #endif
1728
1729 /* Now check if the helo_data expansion went well, and sign off cleanly if
1730 it didn't. */
1731
1732 if (!sx->helo_data)
1733 {
1734 message = string_sprintf("failed to expand helo_data: %s",
1735 expand_string_message);
1736 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1737 yield = DEFER;
1738 goto SEND_QUIT;
1739 }
1740 }
1741
1742 /** Debugging without sending a message
1743 sx->addrlist->transport_return = DEFER;
1744 goto SEND_QUIT;
1745 **/
1746
1747 /* Errors that occur after this point follow an SMTP command, which is
1748 left in big_buffer by smtp_write_command() for use in error messages. */
1749
1750 smtp_command = big_buffer;
1751
1752 /* Tell the remote who we are...
1753
1754 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1755 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1756 greeting is of this form. The assumption was that the far end supports it
1757 properly... but experience shows that there are some that give 5xx responses,
1758 even though the banner includes "ESMTP" (there's a bloody-minded one that
1759 says "ESMTP not spoken here"). Cope with that case.
1760
1761 September 2000: Time has passed, and it seems reasonable now to always send
1762 EHLO at the start. It is also convenient to make the change while installing
1763 the TLS stuff.
1764
1765 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1766 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1767 would be no way to send out the mails, so there is now a host list
1768 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1769 PIPELINING problem as well. Maybe it can also be useful to cure other
1770 problems with broken servers.
1771
1772 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1773 Then somebody tried it with a Microsoft mailer... It seems that all other
1774 mailers use upper case for some reason (the RFC is quite clear about case
1775 independence) so, for peace of mind, I gave in. */
1776
1777 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1778
1779 /* Alas; be careful, since this goto is not an error-out, so conceivably
1780 we might set data between here and the target which we assume to exist
1781 and be usable. I can see this coming back to bite us. */
1782 #ifdef SUPPORT_TLS
1783 if (sx->smtps)
1784 {
1785 smtp_peer_options |= OPTION_TLS;
1786 suppress_tls = FALSE;
1787 sx->ob->tls_tempfail_tryclear = FALSE;
1788 smtp_command = US"SSL-on-connect";
1789 goto TLS_NEGOTIATE;
1790 }
1791 #endif
1792
1793 if (sx->esmtp)
1794 {
1795 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1796 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1797 goto SEND_FAILED;
1798 sx->esmtp_sent = TRUE;
1799 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1800 sx->ob->command_timeout))
1801 {
1802 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1803 {
1804 #ifdef EXPERIMENTAL_DSN_INFO
1805 sx->helo_response = string_copy(sx->buffer);
1806 #endif
1807 goto RESPONSE_FAILED;
1808 }
1809 sx->esmtp = FALSE;
1810 }
1811 #ifdef EXPERIMENTAL_DSN_INFO
1812 sx->helo_response = string_copy(sx->buffer);
1813 #endif
1814 }
1815 else
1816 DEBUG(D_transport)
1817 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1818
1819 if (!sx->esmtp)
1820 {
1821 BOOL good_response;
1822 int n = sizeof(sx->buffer);
1823 uschar * rsp = sx->buffer;
1824
1825 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1826 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1827
1828 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1829 goto SEND_FAILED;
1830 good_response = smtp_read_response(&sx->inblock, rsp, n,
1831 '2', sx->ob->command_timeout);
1832 #ifdef EXPERIMENTAL_DSN_INFO
1833 sx->helo_response = string_copy(rsp);
1834 #endif
1835 if (!good_response)
1836 {
1837 /* Handle special logging for a closed connection after HELO
1838 when had previously sent EHLO */
1839
1840 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1841 {
1842 errno = ERRNO_SMTPCLOSED;
1843 goto EHLOHELO_FAILED;
1844 }
1845 memmove(sx->buffer, rsp, Ustrlen(rsp));
1846 goto RESPONSE_FAILED;
1847 }
1848 }
1849
1850 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1851
1852 if (sx->esmtp || sx->lmtp)
1853 {
1854 sx->peer_offered = ehlo_response(sx->buffer,
1855 OPTION_TLS /* others checked later */
1856 );
1857
1858 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1859
1860 #ifdef SUPPORT_TLS
1861 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1862 #endif
1863 }
1864 }
1865
1866 /* For continuing deliveries down the same channel, having re-exec'd the socket
1867 is the standard input; for a socket held open from verify it is recorded
1868 in the cutthrough context block. Either way we don't need to redo EHLO here
1869 (but may need to do so for TLS - see below).
1870 Set up the pointer to where subsequent commands will be left, for
1871 error messages. Note that smtp_peer_options will have been
1872 set from the command line if they were set in the process that passed the
1873 connection on. */
1874
1875 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1876 as the continue goes via transport_pass_socket() and doublefork and exec.
1877 It does not wait. Unclear how we keep separate host's responses
1878 separate - we could match up by host ip+port as a bodge. */
1879
1880 else
1881 {
1882 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1883 {
1884 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1885 sx->host->port = sx->port = cutthrough.host.port;
1886 }
1887 else
1888 {
1889 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1890 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1891 }
1892 smtp_command = big_buffer;
1893 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1894
1895 /* For a continued connection with TLS being proxied for us, or a
1896 held-open verify connection with TLS, nothing more to do. */
1897
1898 if ( continue_proxy_cipher
1899 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1900 )
1901 {
1902 sx->peer_offered = smtp_peer_options;
1903 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1904 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1905 continue_proxy_cipher ? "proxied" : "verify conn with");
1906 return OK;
1907 }
1908 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1909 }
1910
1911 /* If TLS is available on this connection, whether continued or not, attempt to
1912 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1913 send another EHLO - the server may give a different answer in secure mode. We
1914 use a separate buffer for reading the response to STARTTLS so that if it is
1915 negative, the original EHLO data is available for subsequent analysis, should
1916 the client not be required to use TLS. If the response is bad, copy the buffer
1917 for error analysis. */
1918
1919 #ifdef SUPPORT_TLS
1920 if ( smtp_peer_options & OPTION_TLS
1921 && !suppress_tls
1922 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1923 && ( !sx->verify
1924 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1925 ) )
1926 {
1927 uschar buffer2[4096];
1928 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1929 goto SEND_FAILED;
1930
1931 /* If there is an I/O error, transmission of this message is deferred. If
1932 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1933 false, we also defer. However, if there is a temporary rejection of STARTTLS
1934 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1935 STARTTLS, we carry on. This means we will try to send the message in clear,
1936 unless the host is in hosts_require_tls (tested below). */
1937
1938 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1939 sx->ob->command_timeout))
1940 {
1941 if ( errno != 0
1942 || buffer2[0] == 0
1943 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1944 )
1945 {
1946 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1947 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1948 goto RESPONSE_FAILED;
1949 }
1950 }
1951
1952 /* STARTTLS accepted: try to negotiate a TLS session. */
1953
1954 else
1955 TLS_NEGOTIATE:
1956 {
1957 address_item * addr;
1958 uschar * errstr;
1959 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1960 # ifdef SUPPORT_DANE
1961 sx->dane ? &tlsa_dnsa : NULL,
1962 # endif
1963 &errstr);
1964
1965 /* TLS negotiation failed; give an error. From outside, this function may
1966 be called again to try in clear on a new connection, if the options permit
1967 it for this host. */
1968
1969 if (rc != OK)
1970 {
1971 # ifdef SUPPORT_DANE
1972 if (sx->dane)
1973 {
1974 log_write(0, LOG_MAIN,
1975 "DANE attempt failed; TLS connection to %s [%s]: %s",
1976 sx->host->name, sx->host->address, errstr);
1977 (void) event_raise(sx->tblock->event_action,
1978 US"dane:fail", US"validation-failure"); /* could do with better detail */
1979 }
1980 # endif
1981
1982 errno = ERRNO_TLSFAILURE;
1983 message = string_sprintf("TLS session: %s", errstr);
1984 sx->send_quit = FALSE;
1985 goto TLS_FAILED;
1986 }
1987
1988 /* TLS session is set up */
1989
1990 smtp_peer_options_wrap = smtp_peer_options;
1991 for (addr = sx->addrlist; addr; addr = addr->next)
1992 if (addr->transport_return == PENDING_DEFER)
1993 {
1994 addr->cipher = tls_out.cipher;
1995 addr->ourcert = tls_out.ourcert;
1996 addr->peercert = tls_out.peercert;
1997 addr->peerdn = tls_out.peerdn;
1998 addr->ocsp = tls_out.ocsp;
1999 }
2000 }
2001 }
2002
2003 /* if smtps, we'll have smtp_command set to something else; always safe to
2004 reset it here. */
2005 smtp_command = big_buffer;
2006
2007 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2008 helo_data is null, we are dealing with a connection that was passed from
2009 another process, and so we won't have expanded helo_data above. We have to
2010 expand it here. $sending_ip_address and $sending_port are set up right at the
2011 start of the Exim process (in exim.c). */
2012
2013 if (tls_out.active >= 0)
2014 {
2015 char *greeting_cmd;
2016 BOOL good_response;
2017
2018 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2019 {
2020 uschar *message = string_sprintf("failed to expand helo_data: %s",
2021 expand_string_message);
2022 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2023 yield = DEFER;
2024 goto SEND_QUIT;
2025 }
2026
2027 /* For SMTPS we need to wait for the initial OK response. */
2028 if (sx->smtps)
2029 {
2030 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2031 '2', sx->ob->command_timeout);
2032 #ifdef EXPERIMENTAL_DSN_INFO
2033 sx->smtp_greeting = string_copy(sx->buffer);
2034 #endif
2035 if (!good_response) goto RESPONSE_FAILED;
2036 }
2037
2038 if (sx->esmtp)
2039 greeting_cmd = "EHLO";
2040 else
2041 {
2042 greeting_cmd = "HELO";
2043 DEBUG(D_transport)
2044 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2045 }
2046
2047 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2048 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2049 goto SEND_FAILED;
2050 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2051 '2', sx->ob->command_timeout);
2052 #ifdef EXPERIMENTAL_DSN_INFO
2053 sx->helo_response = string_copy(sx->buffer);
2054 #endif
2055 if (!good_response) goto RESPONSE_FAILED;
2056 smtp_peer_options = 0;
2057 }
2058
2059 /* If the host is required to use a secure channel, ensure that we
2060 have one. */
2061
2062 else if ( sx->smtps
2063 # ifdef SUPPORT_DANE
2064 || sx->dane
2065 # endif
2066 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2067 )
2068 {
2069 errno = ERRNO_TLSREQUIRED;
2070 message = string_sprintf("a TLS session is required, but %s",
2071 smtp_peer_options & OPTION_TLS
2072 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2073 # ifdef SUPPORT_DANE
2074 if (sx->dane)
2075 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2076 smtp_peer_options & OPTION_TLS
2077 ? US"validation-failure" /* could do with better detail */
2078 : US"starttls-not-supported");
2079 # endif
2080 goto TLS_FAILED;
2081 }
2082 #endif /*SUPPORT_TLS*/
2083
2084 /* If TLS is active, we have just started it up and re-done the EHLO command,
2085 so its response needs to be analyzed. If TLS is not active and this is a
2086 continued session down a previously-used socket, we haven't just done EHLO, so
2087 we skip this. */
2088
2089 if (continue_hostname == NULL
2090 #ifdef SUPPORT_TLS
2091 || tls_out.active >= 0
2092 #endif
2093 )
2094 {
2095 if (sx->esmtp || sx->lmtp)
2096 {
2097 sx->peer_offered = ehlo_response(sx->buffer,
2098 0 /* no TLS */
2099 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2100 | OPTION_CHUNKING
2101 | OPTION_PRDR
2102 #ifdef SUPPORT_I18N
2103 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2104 /*XXX if we hand peercaps on to continued-conn processes,
2105 must not depend on this addr */
2106 #endif
2107 | OPTION_DSN
2108 | OPTION_PIPE
2109 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2110 );
2111
2112 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2113 lmtp_ignore_quota option was set. */
2114
2115 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2116
2117 /* If the response to EHLO specified support for the SIZE parameter, note
2118 this, provided size_addition is non-negative. */
2119
2120 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2121
2122 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2123 the current host, esmtp will be false, so PIPELINING can never be used. If
2124 the current host matches hosts_avoid_pipelining, don't do it. */
2125
2126 if ( sx->peer_offered & OPTION_PIPE
2127 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2128 smtp_peer_options |= OPTION_PIPE;
2129
2130 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2131 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2132
2133 if ( sx->peer_offered & OPTION_CHUNKING
2134 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2135 sx->peer_offered &= ~OPTION_CHUNKING;
2136
2137 if (sx->peer_offered & OPTION_CHUNKING)
2138 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2139
2140 #ifndef DISABLE_PRDR
2141 if ( sx->peer_offered & OPTION_PRDR
2142 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2143 sx->peer_offered &= ~OPTION_PRDR;
2144
2145 if (sx->peer_offered & OPTION_PRDR)
2146 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2147 #endif
2148
2149 /* Note if the server supports DSN */
2150 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2151 DEBUG(D_transport) debug_printf("%susing DSN\n",
2152 sx->peer_offered & OPTION_DSN ? "" : "not ");
2153
2154 /* Note if the response to EHLO specifies support for the AUTH extension.
2155 If it has, check that this host is one we want to authenticate to, and do
2156 the business. The host name and address must be available when the
2157 authenticator's client driver is running. */
2158
2159 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2160 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2161 {
2162 default: goto SEND_QUIT;
2163 case OK: break;
2164 case FAIL_SEND: goto SEND_FAILED;
2165 case FAIL: goto RESPONSE_FAILED;
2166 }
2167 }
2168 }
2169 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2170
2171 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2172 message-specific. */
2173
2174 sx->setting_up = FALSE;
2175
2176 #ifdef SUPPORT_I18N
2177 if (sx->addrlist->prop.utf8_msg)
2178 {
2179 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2180 && !sx->addrlist->prop.utf8_downcvt_maybe;
2181 DEBUG(D_transport) if (!sx->utf8_needed)
2182 debug_printf("utf8: %s downconvert\n",
2183 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2184 }
2185
2186 /* If this is an international message we need the host to speak SMTPUTF8 */
2187 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2188 {
2189 errno = ERRNO_UTF8_FWD;
2190 goto RESPONSE_FAILED;
2191 }
2192 #endif
2193
2194 return OK;
2195
2196
2197 {
2198 int code;
2199
2200 RESPONSE_FAILED:
2201 message = NULL;
2202 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2203 sx->buffer, &code, &message, &pass_message);
2204 goto FAILED;
2205
2206 SEND_FAILED:
2207 code = '4';
2208 message = US string_sprintf("send() to %s [%s] failed: %s",
2209 sx->host->name, sx->host->address, strerror(errno));
2210 sx->send_quit = FALSE;
2211 goto FAILED;
2212
2213 EHLOHELO_FAILED:
2214 code = '4';
2215 message = string_sprintf("Remote host closed connection in response to %s"
2216 " (EHLO response was: %s)", smtp_command, sx->buffer);
2217 sx->send_quit = FALSE;
2218 goto FAILED;
2219
2220 /* This label is jumped to directly when a TLS negotiation has failed,
2221 or was not done for a host for which it is required. Values will be set
2222 in message and errno, and setting_up will always be true. Treat as
2223 a temporary error. */
2224
2225 #ifdef SUPPORT_TLS
2226 TLS_FAILED:
2227 code = '4';
2228 goto FAILED;
2229 #endif
2230
2231 /* The failure happened while setting up the call; see if the failure was
2232 a 5xx response (this will either be on connection, or following HELO - a 5xx
2233 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2234 fail all addresses, as this host is never going to accept them. For other
2235 errors during setting up (timeouts or whatever), defer all addresses, and
2236 yield DEFER, so that the host is not tried again for a while.
2237
2238 XXX This peeking for another host feels like a layering violation. We want
2239 to note the host as unusable, but down here we shouldn't know if this was
2240 the last host to try for the addr(list). Perhaps the upper layer should be
2241 the one to do set_errno() ? The problem is that currently the addr is where
2242 errno etc. are stashed, but until we run out of hosts to try the errors are
2243 host-specific. Maybe we should enhance the host_item definition? */
2244
2245 FAILED:
2246 sx->ok = FALSE; /* For when reached by GOTO */
2247 set_errno(sx->addrlist, errno, message,
2248 sx->host->next
2249 ? DEFER
2250 : code == '5'
2251 #ifdef SUPPORT_I18N
2252 || errno == ERRNO_UTF8_FWD
2253 #endif
2254 ? FAIL : DEFER,
2255 pass_message, sx->host
2256 #ifdef EXPERIMENTAL_DSN_INFO
2257 , sx->smtp_greeting, sx->helo_response
2258 #endif
2259 );
2260 yield = DEFER;
2261 }
2262
2263
2264 SEND_QUIT:
2265
2266 if (sx->send_quit)
2267 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2268
2269 #ifdef SUPPORT_TLS
2270 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2271 #endif
2272
2273 /* Close the socket, and return the appropriate value, first setting
2274 works because the NULL setting is passed back to the calling process, and
2275 remote_max_parallel is forced to 1 when delivering over an existing connection,
2276 */
2277
2278 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2279 if (sx->send_quit)
2280 {
2281 shutdown(sx->outblock.sock, SHUT_WR);
2282 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2283 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2284 rc--; /* drain socket */
2285 sx->send_quit = FALSE;
2286 }
2287 (void)close(sx->inblock.sock);
2288 sx->inblock.sock = sx->outblock.sock = -1;
2289
2290 #ifndef DISABLE_EVENT
2291 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2292 #endif
2293
2294 continue_transport = NULL;
2295 continue_hostname = NULL;
2296 return yield;
2297 }
2298
2299
2300
2301
2302 /* Create the string of options that will be appended to the MAIL FROM:
2303 in the connection context buffer */
2304
2305 static int
2306 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2307 {
2308 uschar * p = sx->buffer;
2309 address_item * addr;
2310 int address_count;
2311
2312 *p = 0;
2313
2314 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2315 send it, adding something to the message size to allow for imprecision
2316 and things that get added en route. Exim keeps the number of lines
2317 in a message, so we can give an accurate value for the original message, but we
2318 need some additional to handle added headers. (Double "." characters don't get
2319 included in the count.) */
2320
2321 if ( message_size > 0
2322 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2323 {
2324 /*XXX problem here under spool_files_wireformat?
2325 Or just forget about lines? Or inflate by a fixed proportion? */
2326
2327 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2328 while (*p) p++;
2329 }
2330
2331 #ifndef DISABLE_PRDR
2332 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2333 request that */
2334
2335 sx->prdr_active = FALSE;
2336 if (sx->peer_offered & OPTION_PRDR)
2337 for (addr = addrlist; addr; addr = addr->next)
2338 if (addr->transport_return == PENDING_DEFER)
2339 {
2340 for (addr = addr->next; addr; addr = addr->next)
2341 if (addr->transport_return == PENDING_DEFER)
2342 { /* at least two recipients to send */
2343 sx->prdr_active = TRUE;
2344 sprintf(CS p, " PRDR"); p += 5;
2345 break;
2346 }
2347 break;
2348 }
2349 #endif
2350
2351 #ifdef SUPPORT_I18N
2352 /* If it supports internationalised messages, and this meesage need that,
2353 request it */
2354
2355 if ( sx->peer_offered & OPTION_UTF8
2356 && addrlist->prop.utf8_msg
2357 && !addrlist->prop.utf8_downcvt
2358 )
2359 Ustrcpy(p, " SMTPUTF8"), p += 9;
2360 #endif
2361
2362 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2363 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2364 addr && address_count < sx->max_rcpt;
2365 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2366 {
2367 address_count++;
2368 if (!(addr->dsn_flags & rf_dsnlasthop))
2369 {
2370 sx->dsn_all_lasthop = FALSE;
2371 break;
2372 }
2373 }
2374
2375 /* Add any DSN flags to the mail command */
2376
2377 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2378 {
2379 if (dsn_ret == dsn_ret_hdrs)
2380 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2381 else if (dsn_ret == dsn_ret_full)
2382 { Ustrcpy(p, " RET=FULL"); p += 9; }
2383
2384 if (dsn_envid)
2385 {
2386 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2387 while (*p) p++;
2388 }
2389 }
2390
2391 /* If an authenticated_sender override has been specified for this transport
2392 instance, expand it. If the expansion is forced to fail, and there was already
2393 an authenticated_sender for this message, the original value will be used.
2394 Other expansion failures are serious. An empty result is ignored, but there is
2395 otherwise no check - this feature is expected to be used with LMTP and other
2396 cases where non-standard addresses (e.g. without domains) might be required. */
2397
2398 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2399 return ERROR;
2400
2401 return OK;
2402 }
2403
2404
2405 static void
2406 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2407 {
2408 uschar * p = sx->buffer;
2409 *p = 0;
2410
2411 /* Add any DSN flags to the rcpt command */
2412
2413 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2414 {
2415 if (addr->dsn_flags & rf_dsnflags)
2416 {
2417 int i;
2418 BOOL first = TRUE;
2419
2420 Ustrcpy(p, " NOTIFY=");
2421 while (*p) p++;
2422 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2423 {
2424 if (!first) *p++ = ',';
2425 first = FALSE;
2426 Ustrcpy(p, rf_names[i]);
2427 while (*p) p++;
2428 }
2429 }
2430
2431 if (addr->dsn_orcpt)
2432 {
2433 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2434 addr->dsn_orcpt);
2435 while (*p) p++;
2436 }
2437 }
2438 }
2439
2440
2441
2442 /*
2443 Return:
2444 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2445 -1 MAIL response error
2446 -2 any non-MAIL read i/o error
2447 -3 non-MAIL response timeout
2448 -4 internal error; channel still usable
2449 -5 transmit failed
2450 */
2451
2452 int
2453 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2454 {
2455 address_item * addr;
2456 int address_count;
2457 int rc;
2458
2459 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2460 {
2461 *yield = ERROR;
2462 return -4;
2463 }
2464
2465 /* From here until we send the DATA command, we can make use of PIPELINING
2466 if the server host supports it. The code has to be able to check the responses
2467 at any point, for when the buffer fills up, so we write it totally generally.
2468 When PIPELINING is off, each command written reports that it has flushed the
2469 buffer. */
2470
2471 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2472
2473 {
2474 uschar * s = sx->from_addr;
2475 #ifdef SUPPORT_I18N
2476 uschar * errstr = NULL;
2477
2478 /* If we must downconvert, do the from-address here. Remember we had to
2479 for the to-addresses (done below), and also (ugly) for re-doing when building
2480 the delivery log line. */
2481
2482 if ( sx->addrlist->prop.utf8_msg
2483 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2484 )
2485 {
2486 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2487 {
2488 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2489 *yield = ERROR;
2490 return -4;
2491 }
2492 setflag(sx->addrlist, af_utf8_downcvt);
2493 }
2494 #endif
2495
2496 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2497 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2498 }
2499
2500 mail_command = string_copy(big_buffer); /* Save for later error message */
2501
2502 switch(rc)
2503 {
2504 case -1: /* Transmission error */
2505 return -5;
2506
2507 case +1: /* Cmd was sent */
2508 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2509 sx->ob->command_timeout))
2510 {
2511 if (errno == 0 && sx->buffer[0] == '4')
2512 {
2513 errno = ERRNO_MAIL4XX;
2514 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2515 }
2516 return -1;
2517 }
2518 sx->pending_MAIL = FALSE;
2519 break;
2520
2521 /* otherwise zero: command queued for pipeline */
2522 }
2523
2524 /* Pass over all the relevant recipient addresses for this host, which are the
2525 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2526 several before we have to read the responses for those seen so far. This
2527 checking is done by a subroutine because it also needs to be done at the end.
2528 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2529 the next one if not all are sent.
2530
2531 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2532 last address because we want to abort if any recipients have any kind of
2533 problem, temporary or permanent. We know that all recipient addresses will have
2534 the PENDING_DEFER status, because only one attempt is ever made, and we know
2535 that max_rcpt will be large, so all addresses will be done at once.
2536
2537 For verify we flush the pipeline after any (the only) rcpt address. */
2538
2539 for (addr = sx->first_addr, address_count = 0;
2540 addr && address_count < sx->max_rcpt;
2541 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2542 {
2543 int count;
2544 BOOL no_flush;
2545 uschar * rcpt_addr;
2546
2547 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2548 {
2549 setflag(addr, af_tcp_fastopen_conn);
2550 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2551 }
2552
2553 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2554 ? dsn_support_yes : dsn_support_no;
2555
2556 address_count++;
2557 no_flush = pipelining_active && !sx->verify
2558 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2559
2560 build_rcptcmd_options(sx, addr);
2561
2562 /* Now send the RCPT command, and process outstanding responses when
2563 necessary. After a timeout on RCPT, we just end the function, leaving the
2564 yield as OK, because this error can often mean that there is a problem with
2565 just one address, so we don't want to delay the host. */
2566
2567 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2568
2569 #ifdef SUPPORT_I18N
2570 if ( testflag(sx->addrlist, af_utf8_downcvt)
2571 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2572 )
2573 {
2574 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2575 errno = ERRNO_EXPANDFAIL;
2576 return -5; /*XXX too harsh? */
2577 }
2578 #endif
2579
2580 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2581 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2582
2583 if (count < 0) return -5;
2584 if (count > 0)
2585 {
2586 switch(sync_responses(sx, count, 0))
2587 {
2588 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2589 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2590 break;
2591
2592 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2593 if (!sx->lmtp) /* can't tell about progress yet */
2594 sx->completed_addr = TRUE;
2595 case 0: /* No 2xx or 5xx, but no probs */
2596 break;
2597
2598 case -1: return -3; /* Timeout on RCPT */
2599 case -2: return -2; /* non-MAIL read i/o error */
2600 default: return -1; /* any MAIL error */
2601 }
2602 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2603 }
2604 } /* Loop for next address */
2605
2606 tcp_out_fastopen_logged = TRUE;
2607 sx->next_addr = addr;
2608 return 0;
2609 }
2610
2611
2612 #ifdef SUPPORT_TLS
2613 /*****************************************************
2614 * Proxy TLS connection for another transport process *
2615 ******************************************************/
2616 /*
2617 Close the unused end of the pipe, fork once more, then use the given buffer
2618 as a staging area, and select on both the given fd and the TLS'd client-fd for
2619 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2620 Do blocking full-size writes, and reads under a timeout. Once both input
2621 channels are closed, exit the process.
2622
2623 Arguments:
2624 buf space to use for buffering
2625 bufsiz size of buffer
2626 pfd pipe filedescriptor array; [0] is comms to proxied process
2627 timeout per-read timeout, seconds
2628 */
2629
2630 void
2631 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2632 {
2633 fd_set rfds, efds;
2634 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2635 int rc, i, fd_bits, nbytes;
2636
2637 close(pfd[1]);
2638 if ((rc = fork()))
2639 {
2640 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2641 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2642 }
2643
2644 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2645 set_process_info("proxying TLS connection for continued transport");
2646 FD_ZERO(&rfds);
2647 FD_SET(tls_out.active, &rfds);
2648 FD_SET(pfd[0], &rfds);
2649
2650 for (fd_bits = 3; fd_bits; )
2651 {
2652 time_t time_left = timeout;
2653 time_t time_start = time(NULL);
2654
2655 /* wait for data */
2656 efds = rfds;
2657 do
2658 {
2659 struct timeval tv = { time_left, 0 };
2660
2661 rc = select(max_fd,
2662 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2663
2664 if (rc < 0 && errno == EINTR)
2665 if ((time_left -= time(NULL) - time_start) > 0) continue;
2666
2667 if (rc <= 0)
2668 {
2669 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2670 goto done;
2671 }
2672
2673 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2674 {
2675 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2676 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2677 goto done;
2678 }
2679 }
2680 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2681
2682 /* handle inbound data */
2683 if (FD_ISSET(tls_out.active, &rfds))
2684 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2685 {
2686 fd_bits &= ~1;
2687 FD_CLR(tls_out.active, &rfds);
2688 shutdown(pfd[0], SHUT_WR);
2689 timeout = 5;
2690 }
2691 else
2692 {
2693 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2694 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2695 }
2696 else if (fd_bits & 1)
2697 FD_SET(tls_out.active, &rfds);
2698
2699 /* handle outbound data */
2700 if (FD_ISSET(pfd[0], &rfds))
2701 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2702 {
2703 fd_bits = 0;
2704 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2705 }
2706 else
2707 {
2708 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2709 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2710 goto done;
2711 }
2712 else if (fd_bits & 2)
2713 FD_SET(pfd[0], &rfds);
2714 }
2715
2716 done:
2717 if (running_in_test_harness) millisleep(100); /* let logging complete */
2718 exim_exit(0, US"TLS proxy");
2719 }
2720 #endif
2721
2722
2723 /*************************************************
2724 * Deliver address list to given host *
2725 *************************************************/
2726
2727 /* If continue_hostname is not null, we get here only when continuing to
2728 deliver down an existing channel. The channel was passed as the standard
2729 input. TLS is never active on a passed channel; the previous process always
2730 closes it down before passing the connection on.
2731
2732 Otherwise, we have to make a connection to the remote host, and do the
2733 initial protocol exchange.
2734
2735 When running as an MUA wrapper, if the sender or any recipient is rejected,
2736 temporarily or permanently, we force failure for all recipients.
2737
2738 Arguments:
2739 addrlist chain of potential addresses to deliver; only those whose
2740 transport_return field is set to PENDING_DEFER are currently
2741 being processed; others should be skipped - they have either
2742 been delivered to an earlier host or IP address, or been
2743 failed by one of them.
2744 host host to deliver to
2745 host_af AF_INET or AF_INET6
2746 defport default TCP/IP port to use if host does not specify, in host
2747 byte order
2748 interface interface to bind to, or NULL
2749 tblock transport instance block
2750 message_defer set TRUE if yield is OK, but all addresses were deferred
2751 because of a non-recipient, non-host failure, that is, a
2752 4xx response to MAIL FROM, DATA, or ".". This is a defer
2753 that is specific to the message.
2754 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2755 a second attempt after TLS initialization fails
2756
2757 Returns: OK - the connection was made and the delivery attempted;
2758 the result for each address is in its data block.
2759 DEFER - the connection could not be made, or something failed
2760 while setting up the SMTP session, or there was a
2761 non-message-specific error, such as a timeout.
2762 ERROR - a filter command is specified for this transport,
2763 and there was a problem setting it up; OR helo_data
2764 or add_headers or authenticated_sender is specified
2765 for this transport, and the string failed to expand
2766 */
2767
2768 static int
2769 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2770 uschar *interface, transport_instance *tblock,
2771 BOOL *message_defer, BOOL suppress_tls)
2772 {
2773 address_item *addr;
2774 int yield = OK;
2775 int save_errno;
2776 int rc;
2777 struct timeval start_delivery_time;
2778
2779 BOOL pass_message = FALSE;
2780 uschar *message = NULL;
2781 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2782
2783 smtp_context sx;
2784
2785 gettimeofday(&start_delivery_time, NULL);
2786 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2787 *message_defer = FALSE;
2788
2789 sx.addrlist = addrlist;
2790 sx.host = host;
2791 sx.host_af = host_af,
2792 sx.port = defport;
2793 sx.interface = interface;
2794 sx.helo_data = NULL;
2795 sx.tblock = tblock;
2796 sx.verify = FALSE;
2797
2798 /* Get the channel set up ready for a message (MAIL FROM being the next
2799 SMTP command to send */
2800
2801 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2802 return rc;
2803
2804 /* If there is a filter command specified for this transport, we can now
2805 set it up. This cannot be done until the identify of the host is known. */
2806
2807 if (tblock->filter_command)
2808 {
2809 transport_filter_timeout = tblock->filter_timeout;
2810
2811 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2812 yield ERROR. */
2813
2814 if (!transport_set_up_command(&transport_filter_argv,
2815 tblock->filter_command, TRUE, DEFER, addrlist,
2816 string_sprintf("%.50s transport", tblock->name), NULL))
2817 {
2818 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2819 FALSE);
2820 yield = ERROR;
2821 goto SEND_QUIT;
2822 }
2823
2824 if ( transport_filter_argv
2825 && *transport_filter_argv
2826 && **transport_filter_argv
2827 && sx.peer_offered & OPTION_CHUNKING
2828 )
2829 {
2830 sx.peer_offered &= ~OPTION_CHUNKING;
2831 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2832 }
2833 }
2834
2835 sx.first_addr = addrlist;
2836
2837 /* For messages that have more than the maximum number of envelope recipients,
2838 we want to send several transactions down the same SMTP connection. (See
2839 comments in deliver.c as to how this reconciles, heuristically, with
2840 remote_max_parallel.) This optimization was added to Exim after the following
2841 code was already working. The simplest way to put it in without disturbing the
2842 code was to use a goto to jump back to this point when there is another
2843 transaction to handle. */
2844
2845 SEND_MESSAGE:
2846 sx.from_addr = return_path;
2847 sx.sync_addr = sx.first_addr;
2848 sx.ok = FALSE;
2849 sx.send_rset = TRUE;
2850 sx.completed_addr = FALSE;
2851
2852
2853 /* If we are a continued-connection-after-verify the MAIL and RCPT
2854 commands were already sent; do not re-send but do mark the addrs as
2855 having been accepted up to RCPT stage. A traditional cont-conn
2856 always has a sequence number greater than one. */
2857
2858 if (continue_hostname && continue_sequence == 1)
2859 {
2860 address_item * addr;
2861
2862 sx.peer_offered = smtp_peer_options;
2863 sx.pending_MAIL = FALSE;
2864 sx.ok = TRUE;
2865 sx.next_addr = NULL;
2866
2867 for (addr = addrlist; addr; addr = addr->next)
2868 addr->transport_return = PENDING_OK;
2869 }
2870 else
2871 {
2872 /* Initiate a message transfer. */
2873
2874 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2875 {
2876 case 0: break;
2877 case -1: case -2: goto RESPONSE_FAILED;
2878 case -3: goto END_OFF;
2879 case -4: goto SEND_QUIT;
2880 default: goto SEND_FAILED;
2881 }
2882
2883 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2884 permanently or temporarily. We should have flushed and synced after the last
2885 RCPT. */
2886
2887 if (mua_wrapper)
2888 {
2889 address_item * a;
2890 unsigned cnt;
2891
2892 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2893 if (a->transport_return != PENDING_OK)
2894 {
2895 /*XXX could we find a better errno than 0 here? */
2896 set_errno_nohost(addrlist, 0, a->message, FAIL,
2897 testflag(a, af_pass_message));
2898 sx.ok = FALSE;
2899 break;
2900 }
2901 }
2902 }
2903
2904 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2905 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2906 have a good recipient buffered up if we are pipelining. We don't want to waste
2907 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2908 are pipelining. The responses are all handled by sync_responses().
2909 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2910 to send is. */
2911
2912 if ( !(sx.peer_offered & OPTION_CHUNKING)
2913 && (sx.ok || (pipelining_active && !mua_wrapper)))
2914 {
2915 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2916
2917 if (count < 0) goto SEND_FAILED;
2918 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2919 {
2920 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2921 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2922 break;
2923
2924 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2925 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2926 case 0: break; /* No 2xx or 5xx, but no probs */
2927
2928 case -1: goto END_OFF; /* Timeout on RCPT */
2929 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2930 }
2931 pipelining_active = FALSE;
2932 data_command = string_copy(big_buffer); /* Save for later error message */
2933 }
2934
2935 /* If there were no good recipients (but otherwise there have been no
2936 problems), just set ok TRUE, since we have handled address-specific errors
2937 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2938 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2939 well as body. Set the appropriate timeout value to be used for each chunk.
2940 (Haven't been able to make it work using select() for writing yet.) */
2941
2942 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2943 {
2944 /* Save the first address of the next batch. */
2945 sx.first_addr = sx.next_addr;
2946
2947 sx.ok = TRUE;
2948 }
2949 else
2950 {
2951 transport_ctx tctx = {
2952 {sx.inblock.sock},
2953 tblock,
2954 addrlist,
2955 US".", US"..", /* Escaping strings */
2956 topt_use_crlf | topt_escape_headers
2957 | (tblock->body_only ? topt_no_headers : 0)
2958 | (tblock->headers_only ? topt_no_body : 0)
2959 | (tblock->return_path_add ? topt_add_return_path : 0)
2960 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2961 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2962 };
2963
2964 /* If using CHUNKING we need a callback from the generic transport
2965 support to us, for the sending of BDAT smtp commands and the reaping
2966 of responses. The callback needs a whole bunch of state so set up
2967 a transport-context structure to be passed around. */
2968
2969 if (sx.peer_offered & OPTION_CHUNKING)
2970 {
2971 tctx.check_string = tctx.escape_string = NULL;
2972 tctx.options |= topt_use_bdat;
2973 tctx.chunk_cb = smtp_chunk_cmd_callback;
2974 sx.pending_BDAT = FALSE;
2975 sx.good_RCPT = sx.ok;
2976 sx.cmd_count = 0;
2977 tctx.smtp_context = &sx;
2978 }
2979 else
2980 tctx.options |= topt_end_dot;
2981
2982 /* Save the first address of the next batch. */
2983 sx.first_addr = sx.next_addr;
2984
2985 /* Responses from CHUNKING commands go in buffer. Otherwise,
2986 there has not been a response. */
2987
2988 sx.buffer[0] = 0;
2989
2990 sigalrm_seen = FALSE;
2991 transport_write_timeout = sx.ob->data_timeout;
2992 smtp_command = US"sending data block"; /* For error messages */
2993 DEBUG(D_transport|D_v)
2994 if (sx.peer_offered & OPTION_CHUNKING)
2995 debug_printf(" will write message using CHUNKING\n");
2996 else
2997 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2998 transport_count = 0;
2999
3000 #ifndef DISABLE_DKIM
3001 dkim_exim_sign_init();
3002 # ifdef EXPERIMENTAL_ARC
3003 {
3004 uschar * s = sx.ob->arc_sign;
3005 if (s)
3006 {
3007 if (!(sx.ob->dkim.arc_signspec = expand_string(s)))
3008 {
3009 message = US"failed to expand arc_sign";
3010 sx.ok = FALSE;
3011 goto SEND_FAILED;
3012 }
3013 /* Ask dkim code to hash the body for ARC */
3014 (void) arc_ams_setup_sign_bodyhash();
3015 sx.ob->dkim.force_bodyhash = TRUE;
3016 }
3017 }
3018 # endif
3019 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3020 #else
3021 sx.ok = transport_write_message(&tctx, 0);
3022 #endif
3023
3024 /* transport_write_message() uses write() because it is called from other
3025 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3026 it can exit with "Broken pipe" as its error. This really means that the
3027 socket got closed at the far end. */
3028
3029 transport_write_timeout = 0; /* for subsequent transports */
3030
3031 /* Failure can either be some kind of I/O disaster (including timeout),
3032 or the failure of a transport filter or the expansion of added headers.
3033 Or, when CHUNKING, it can be a protocol-detected failure. */
3034
3035 if (!sx.ok)
3036 if (message) goto SEND_FAILED;
3037 else goto RESPONSE_FAILED;
3038
3039 /* We used to send the terminating "." explicitly here, but because of
3040 buffering effects at both ends of TCP/IP connections, you don't gain
3041 anything by keeping it separate, so it might as well go in the final
3042 data buffer for efficiency. This is now done by setting the topt_end_dot
3043 flag above. */
3044
3045 smtp_command = US"end of data";
3046
3047 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3048 {
3049 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3050 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3051 {
3052 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3053 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3054 break;
3055
3056 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3057 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3058 case 0: break; /* No 2xx or 5xx, but no probs */
3059
3060 case -1: goto END_OFF; /* Timeout on RCPT */
3061 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3062 }
3063 }
3064
3065 #ifndef DISABLE_PRDR
3066 /* For PRDR we optionally get a partial-responses warning
3067 * followed by the individual responses, before going on with
3068 * the overall response. If we don't get the warning then deal
3069 * with per non-PRDR. */
3070 if(sx.prdr_active)
3071 {
3072 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3073 sx.ob->final_timeout);
3074 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3075 {
3076 case '2': sx.prdr_active = FALSE;
3077 sx.ok = TRUE;
3078 break;
3079 case '4': errno = ERRNO_DATA4XX;
3080 addrlist->more_errno |=
3081 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3082 break;
3083 }
3084 }
3085 else
3086 #endif
3087
3088 /* For non-PRDR SMTP, we now read a single response that applies to the
3089 whole message. If it is OK, then all the addresses have been delivered. */
3090
3091 if (!sx.lmtp)
3092 {
3093 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3094 sx.ob->final_timeout);
3095 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3096 {
3097 errno = ERRNO_DATA4XX;
3098 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3099 }
3100 }
3101
3102 /* For LMTP, we get back a response for every RCPT command that we sent;
3103 some may be accepted and some rejected. For those that get a response, their
3104 status is fixed; any that are accepted have been handed over, even if later
3105 responses crash - at least, that's how I read RFC 2033.
3106
3107 If all went well, mark the recipient addresses as completed, record which
3108 host/IPaddress they were delivered to, and cut out RSET when sending another
3109 message down the same channel. Write the completed addresses to the journal
3110 now so that they are recorded in case there is a crash of hardware or
3111 software before the spool gets updated. Also record the final SMTP
3112 confirmation if needed (for SMTP only). */
3113
3114 if (sx.ok)
3115 {
3116 int flag = '=';
3117 struct timeval delivery_time;
3118 int len;
3119 uschar * conf = NULL;
3120
3121 timesince(&delivery_time, &start_delivery_time);
3122 sx.send_rset = FALSE;
3123 pipelining_active = FALSE;
3124
3125 /* Set up confirmation if needed - applies only to SMTP */
3126
3127 if (
3128 #ifdef DISABLE_EVENT
3129 LOGGING(smtp_confirmation) &&
3130 #endif
3131 !sx.lmtp
3132 )
3133 {
3134 const uschar *s = string_printing(sx.buffer);
3135 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3136 conf = (s == sx.buffer)? US string_copy(s) : US s;
3137 }
3138
3139 /* Process all transported addresses - for LMTP or PRDR, read a status for
3140 each one. */
3141
3142 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3143 {
3144 if (addr->transport_return != PENDING_OK) continue;
3145
3146 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3147 remaining addresses. Otherwise, it's a return code for just the one
3148 address. For temporary errors, add a retry item for the address so that
3149 it doesn't get tried again too soon. */
3150
3151 #ifndef DISABLE_PRDR
3152 if (sx.lmtp || sx.prdr_active)
3153 #else
3154 if (sx.lmtp)
3155 #endif
3156 {
3157 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3158 sx.ob->final_timeout))
3159 {
3160 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3161 addr->message = string_sprintf(
3162 #ifndef DISABLE_PRDR
3163 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3164 #else
3165 "LMTP error after %s: %s",
3166 #endif
3167 data_command, string_printing(sx.buffer));
3168 setflag(addr, af_pass_message); /* Allow message to go to user */
3169 if (sx.buffer[0] == '5')
3170 addr->transport_return = FAIL;
3171 else
3172 {
3173 errno = ERRNO_DATA4XX;
3174 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3175 addr->transport_return = DEFER;
3176 #ifndef DISABLE_PRDR
3177 if (!sx.prdr_active)
3178 #endif
3179 retry_add_item(addr, addr->address_retry_key, 0);
3180 }
3181 continue;
3182 }
3183 sx.completed_addr = TRUE; /* NOW we can set this flag */
3184 if (LOGGING(smtp_confirmation))
3185 {
3186 const uschar *s = string_printing(sx.buffer);
3187 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3188 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3189 }
3190 }
3191
3192 /* SMTP, or success return from LMTP for this address. Pass back the
3193 actual host that was used. */
3194
3195 addr->transport_return = OK;
3196 addr->more_errno = delivery_time.tv_sec;
3197 addr->delivery_usec = delivery_time.tv_usec;
3198 addr->host_used = host;
3199 addr->special_action = flag;
3200 addr->message = conf;
3201 #ifndef DISABLE_PRDR
3202 if (sx.prdr_active) setflag(addr, af_prdr_used);
3203 #endif
3204 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3205 flag = '-';
3206
3207 #ifndef DISABLE_PRDR
3208 if (!sx.prdr_active)
3209 #endif
3210 {
3211 /* Update the journal. For homonymic addresses, use the base address plus
3212 the transport name. See lots of comments in deliver.c about the reasons
3213 for the complications when homonyms are involved. Just carry on after
3214 write error, as it may prove possible to update the spool file later. */
3215
3216 if (testflag(addr, af_homonym))
3217 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3218 else
3219 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3220
3221 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3222 len = Ustrlen(CS sx.buffer);
3223 if (write(journal_fd, sx.buffer, len) != len)
3224 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3225 "%s: %s", sx.buffer, strerror(errno));
3226 }
3227 }
3228
3229 #ifndef DISABLE_PRDR
3230 if (sx.prdr_active)
3231 {
3232 const uschar * overall_message;
3233
3234 /* PRDR - get the final, overall response. For any non-success
3235 upgrade all the address statuses. */
3236
3237 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3238 sx.ob->final_timeout);
3239 if (!sx.ok)
3240 {
3241 if(errno == 0 && sx.buffer[0] == '4')
3242 {
3243 errno = ERRNO_DATA4XX;
3244 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3245 }
3246 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3247 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3248 addr->transport_return = PENDING_OK; /* allow set_errno action */
3249 goto RESPONSE_FAILED;
3250 }
3251
3252 /* Append the overall response to the individual PRDR response for logging
3253 and update the journal, or setup retry. */
3254
3255 overall_message = string_printing(sx.buffer);
3256 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3257 if (addr->transport_return == OK)
3258 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3259
3260 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3261 if (addr->transport_return == OK)
3262 {
3263 if (testflag(addr, af_homonym))