tidying
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
92 #endif
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
100 #endif
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
103 #ifdef SUPPORT_TLS
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
107 # endif
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
111 # endif
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
114 #endif
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122 #endif
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
125 #ifndef DISABLE_PRDR
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 #endif
129 #ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132 #endif
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
153 #ifdef SUPPORT_SOCKS
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 #endif
157 #ifdef SUPPORT_TLS
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
180 #endif
181 };
182
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
185
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189 /* Default private options block for the smtp transport. */
190
191 smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
201 NULL, /* DSCP */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
209 #endif
210 NULL, /* hosts_try_fastopen */
211 #ifndef DISABLE_PRDR
212 US"*", /* hosts_try_prdr */
213 #endif
214 #ifndef DISABLE_OCSP
215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
216 NULL, /* hosts_require_ocsp */
217 #endif
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 NULL, /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
223 #ifdef SUPPORT_TLS
224 NULL, /* hosts_nopass_tls */
225 US"*", /* hosts_noproxy_tls */
226 #endif
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 { NULL, NULL }, /* dnssec_domains {request,require} */
241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
245 FALSE, /* lmtp_ignore_quota */
246 NULL, /* expand_retry_include_ip_address */
247 TRUE /* retry_include_ip_address */
248 #ifdef SUPPORT_SOCKS
249 ,NULL /* socks_proxy */
250 #endif
251 #ifdef SUPPORT_TLS
252 ,NULL, /* tls_certificate */
253 NULL, /* tls_crl */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
256 NULL, /* tls_sni */
257 US"system", /* tls_verify_certificates */
258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
262 US"*", /* tls_try_verify_hosts */
263 US"*" /* tls_verify_cert_hostnames */
264 #endif
265 #ifndef DISABLE_DKIM
266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
273 #endif
274 };
275
276 /* some DSN flags for use later */
277
278 static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
280
281 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
282
283
284
285 /* Local statics */
286
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
291
292 /*XXX move to smtp_context */
293 static BOOL pipelining_active; /* current transaction is in pipe mode */
294
295
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
299
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
302
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
306
307 Arguments:
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
314
315 Returns: OK always (FAIL, DEFER not used)
316 */
317
318 static int
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
321 {
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
324
325 errmsg = errmsg; /* Keep picky compilers happy */
326 uid = uid;
327 gid = gid;
328
329 /* Pass back options if required. This interface is getting very messy. */
330
331 if (tf)
332 {
333 tf->interface = ob->interface;
334 tf->port = ob->port;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
343 }
344
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
347 list. */
348
349 if (!testflag(addrlist, af_local_host_removed))
350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
352
353 return OK;
354 }
355
356
357
358 /*************************************************
359 * Initialization entry point *
360 *************************************************/
361
362 /* Called for each instance, after its options have been read, to
363 enable consistency checks to be done, or anything else that needs
364 to be set up.
365
366 Argument: pointer to the transport instance block
367 Returns: nothing
368 */
369
370 void
371 smtp_transport_init(transport_instance *tblock)
372 {
373 smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
375
376 /* Retry_use_local_part defaults FALSE if unset */
377
378 if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
380
381 /* Set the default port according to the protocol */
382
383 if (ob->port == NULL)
384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
386
387 /* Set up the setup entry point, to be called before subprocesses for this
388 transport. */
389
390 tblock->setup = smtp_transport_setup;
391
392 /* Complain if any of the timeouts are zero. */
393
394 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
398 tblock->name);
399
400 /* If hosts_override is set and there are local hosts, set the global
401 flag that stops verify from showing router hosts. */
402
403 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404
405 /* If there are any fallback hosts listed, build a chain of host items
406 for them, but do not do any lookups at this time. */
407
408 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
409 }
410
411
412
413
414
415 /*************************************************
416 * Set delivery info into all active addresses *
417 *************************************************/
418
419 /* Only addresses whose status is >= PENDING are relevant. A lesser
420 status means that an address is not currently being processed.
421
422 Arguments:
423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
428 host if set, mark addrs as having used this host
429 smtp_greeting from peer
430 helo_response from peer
431
432 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434 this particular type of timeout.
435
436 Returns: nothing
437 */
438
439 static void
440 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
441 BOOL pass_message, host_item * host
442 #ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
444 #endif
445 )
446 {
447 address_item *addr;
448 int orvalue = 0;
449 if (errno_value == ERRNO_CONNECTTIMEOUT)
450 {
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
453 }
454 for (addr = addrlist; addr; addr = addr->next)
455 if (addr->transport_return >= PENDING)
456 {
457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
459 if (msg)
460 {
461 addr->message = msg;
462 if (pass_message) setflag(addr, af_pass_message);
463 }
464 addr->transport_return = rc;
465 if (host)
466 {
467 addr->host_used = host;
468 #ifdef EXPERIMENTAL_DSN_INFO
469 if (smtp_greeting)
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
472
473 if (helo_response)
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
476 #endif
477 }
478 }
479 }
480
481 static void
482 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message)
484 {
485 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486 #ifdef EXPERIMENTAL_DSN_INFO
487 , NULL, NULL
488 #endif
489 );
490 }
491
492
493 /*************************************************
494 * Check an SMTP response *
495 *************************************************/
496
497 /* This function is given an errno code and the SMTP response buffer
498 to analyse, together with the host identification for generating messages. It
499 sets an appropriate message and puts the first digit of the response code into
500 the yield variable. If no response was actually read, a suitable digit is
501 chosen.
502
503 Arguments:
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
509 message where to put an error message
510 pass_message set TRUE if message is an SMTP response
511
512 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
513 */
514
515 static BOOL
516 check_response(host_item *host, int *errno_value, int more_errno,
517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
518 {
519 uschar * pl = pipelining_active ? US"pipelined " : US"";
520 const uschar * s;
521
522 *yield = '4'; /* Default setting is to give a temporary error */
523
524 switch(*errno_value)
525 {
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
537 *message = *s == 0
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
542 return FALSE;
543
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
547 more_errno,
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
549 return FALSE;
550
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
553 *message =
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
556 return FALSE;
557
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
560 return FALSE;
561
562 #ifdef SUPPORT_I18N
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 return TRUE;
567 #endif
568 }
569
570 /* Handle error responses from the remote mailer. */
571
572 if (buffer[0] != 0)
573 {
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
576 *pass_message = TRUE;
577 *yield = buffer[0];
578 return TRUE;
579 }
580
581 /* No data was read. If there is no errno, this must be the EOF (i.e.
582 connection closed) case, which causes deferral. An explicit connection reset
583 error has the same effect. Otherwise, put the host's identity in the message,
584 leaving the errno value to be interpreted as well. In all cases, we have to
585 assume the connection is now dead. */
586
587 if (*errno_value == 0 || *errno_value == ECONNRESET)
588 {
589 *errno_value = ERRNO_SMTPCLOSED;
590 *message = US string_sprintf("Remote host closed connection "
591 "in response to %s%s", pl, smtp_command);
592 }
593 else
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
595
596 return FALSE;
597 }
598
599
600
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
604
605 /* This writes to the main log and to the message log.
606
607 Arguments:
608 addr the address item containing error information
609 host the current host
610
611 Returns: nothing
612 */
613
614 static void
615 write_logs(address_item *addr, host_item *host)
616 {
617 uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
621
622 if (addr->message)
623 {
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630 else
631 {
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
635 }
636 }
637
638 static void
639 msglog_line(host_item * host, uschar * message)
640 {
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
643 }
644
645
646
647 #ifndef DISABLE_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
651
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
654
655 Arguments:
656 addr the address item containing error information
657 host the current host
658
659 Returns: nothing
660 */
661
662 static void
663 deferred_event_raise(address_item *addr, host_item *host)
664 {
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
667 uschar * save_local;
668
669 if (!action)
670 return;
671
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
674
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
679
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
684
685 (void) event_raise(action, US"msg:host:defer",
686 addr->message
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
692 : NULL);
693
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
697 }
698 #endif
699
700 /*************************************************
701 * Synchronize SMTP responses *
702 *************************************************/
703
704 /* This function is called from smtp_deliver() to receive SMTP responses from
705 the server, and match them up with the commands to which they relate. When
706 PIPELINING is not in use, this function is called after every command, and is
707 therefore somewhat over-engineered, but it is simpler to use a single scheme
708 that works both with and without PIPELINING instead of having two separate sets
709 of code.
710
711 The set of commands that are buffered up with pipelining may start with MAIL
712 and may end with DATA; in between are RCPT commands that correspond to the
713 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714 etc.) are never buffered.
715
716 Errors after MAIL or DATA abort the whole process leaving the response in the
717 buffer. After MAIL, pending responses are flushed, and the original command is
718 re-instated in big_buffer for error messages. For RCPT commands, the remote is
719 permitted to reject some recipient addresses while accepting others. However
720 certain errors clearly abort the whole process. Set the value in
721 transport_return to PENDING_OK if the address is accepted. If there is a
722 subsequent general error, it will get reset accordingly. If not, it will get
723 converted to OK at the end.
724
725 Arguments:
726 sx smtp connection context
727 count the number of responses to read
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
731
732 Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
739 */
740
741 static int
742 sync_responses(smtp_context * sx, int count, int pending_DATA)
743 {
744 address_item *addr = sx->sync_addr;
745 smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
747 int yield = 0;
748
749 /* Handle the response for a MAIL command. On error, reinstate the original
750 command in big_buffer for error message use, and flush any further pending
751 responses before returning, except after I/O errors and timeouts. */
752
753 if (sx->pending_MAIL)
754 {
755 count--;
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
758 {
759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
761 if (errno == 0 && sx->buffer[0] != 0)
762 {
763 uschar flushbuffer[4096];
764 int save_errno = 0;
765 if (sx->buffer[0] == '4')
766 {
767 save_errno = ERRNO_MAIL4XX;
768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
769 }
770 while (count-- > 0)
771 {
772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
773 '2', ob->command_timeout)
774 && (errno != 0 || flushbuffer[0] == 0))
775 break;
776 }
777 errno = save_errno;
778 }
779
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
782 {
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
784 addr->host_used = sx->host;
785 addr = addr->next;
786 }
787 return -3;
788 }
789 }
790
791 if (pending_DATA) count--; /* Number of RCPT responses to come */
792
793 /* Read and handle the required number of RCPT responses, matching each one up
794 with an address by scanning for the next address whose status is PENDING_DEFER.
795 */
796
797 while (count-- > 0)
798 {
799 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
800
801 /* The address was accepted */
802 addr->host_used = sx->host;
803
804 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
805 '2', ob->command_timeout))
806 {
807 yield |= 1;
808 addr->transport_return = PENDING_OK;
809
810 /* If af_dr_retry_exists is set, there was a routing delay on this address;
811 ensure that any address-specific retry record is expunged. We do this both
812 for the basic key and for the version that also includes the sender. */
813
814 if (testflag(addr, af_dr_retry_exists))
815 {
816 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
817 sender_address);
818 retry_add_item(addr, altkey, rf_delete);
819 retry_add_item(addr, addr->address_retry_key, rf_delete);
820 }
821 }
822
823 /* Timeout while reading the response */
824
825 else if (errno == ETIMEDOUT)
826 {
827 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
828 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
829 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
830 retry_add_item(addr, addr->address_retry_key, 0);
831 update_waiting = FALSE;
832 return -1;
833 }
834
835 /* Handle other errors in obtaining an SMTP response by returning -1. This
836 will cause all the addresses to be deferred. Restore the SMTP command in
837 big_buffer for which we are checking the response, so the error message
838 makes sense. */
839
840 else if (errno != 0 || sx->buffer[0] == 0)
841 {
842 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
843 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
844 return -2;
845 }
846
847 /* Handle SMTP permanent and temporary response codes. */
848
849 else
850 {
851 addr->message =
852 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
853 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
854 string_printing(sx->buffer));
855 setflag(addr, af_pass_message);
856 if (!sx->verify)
857 msglog_line(sx->host, addr->message);
858
859 /* The response was 5xx */
860
861 if (sx->buffer[0] == '5')
862 {
863 addr->transport_return = FAIL;
864 yield |= 2;
865 }
866
867 /* The response was 4xx */
868
869 else
870 {
871 addr->transport_return = DEFER;
872 addr->basic_errno = ERRNO_RCPT4XX;
873 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
874
875 if (!sx->verify)
876 {
877 #ifndef DISABLE_EVENT
878 event_defer_errno = addr->more_errno;
879 msg_event_raise(US"msg:rcpt:host:defer", addr);
880 #endif
881
882 /* Log temporary errors if there are more hosts to be tried.
883 If not, log this last one in the == line. */
884
885 if (sx->host->next)
886 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
887 sx->host->name, sx->host->address, addr->message);
888
889 #ifndef DISABLE_EVENT
890 else
891 msg_event_raise(US"msg:rcpt:defer", addr);
892 #endif
893
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
896
897 update_waiting = FALSE;
898
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
901 to the retry key. */
902
903 retry_add_item(addr,
904 ob->address_retry_include_sender
905 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
906 : addr->address_retry_key,
907 0);
908 }
909 }
910 }
911 } /* Loop for next RCPT response */
912
913 /* Update where to start at for the next block of responses, unless we
914 have already handled all the addresses. */
915
916 if (addr) sx->sync_addr = addr->next;
917
918 /* Handle a response to DATA. If we have not had any good recipients, either
919 previously or in this block, the response is ignored. */
920
921 if (pending_DATA != 0 &&
922 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
923 '3', ob->command_timeout))
924 {
925 int code;
926 uschar *msg;
927 BOOL pass_message;
928 if (pending_DATA > 0 || (yield & 1) != 0)
929 {
930 if (errno == 0 && sx->buffer[0] == '4')
931 {
932 errno = ERRNO_DATA4XX;
933 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
934 }
935 return -3;
936 }
937 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
940 }
941
942 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943 present) received 3xx. If any RCPTs were handled and yielded anything other
944 than 4xx, yield will be set non-zero. */
945
946 return yield;
947 }
948
949
950
951 /* Do the client side of smtp-level authentication */
952 /*
953 Arguments:
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
957 ob transport options
958 ibp, obp comms channel control blocks
959
960 Returns:
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
964
965 FAIL_SEND Failed communications - transmit
966 FAIL - response
967 */
968
969 int
970 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
973 {
974 int require_auth;
975 uschar *fail_reason = US"server did not advertise AUTH support";
976
977 smtp_authenticated = FALSE;
978 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
979 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
980
981 if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
983 FALSE, TRUE);
984
985 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
986 {
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
989
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
992
993 if (require_auth == OK ||
994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
995 {
996 auth_instance *au;
997 fail_reason = US"no common mechanisms were found";
998
999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1000
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1005 */
1006
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1008 {
1009 uschar *p = names;
1010 if (!au->client ||
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1014 {
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1016 au->name,
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1019 continue;
1020 }
1021
1022 /* Loop to scan supported server mechanisms */
1023
1024 while (*p != 0)
1025 {
1026 int rc;
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
1029
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1032 {
1033 while (*p != 0 && !isspace(*p)) p++;
1034 continue;
1035 }
1036
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
1040
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1047 au->name, rc);
1048
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
1053
1054 switch(rc)
1055 {
1056 case OK:
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1061 break;
1062
1063 /* Failure after writing a command */
1064
1065 case FAIL_SEND:
1066 return FAIL_SEND;
1067
1068 /* Failure after reading a response */
1069
1070 case FAIL:
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1074 break;
1075
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1081
1082 case CANCELLED:
1083 if (*buffer != 0)
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1087 break;
1088
1089 /* Internal problem, message in buffer. */
1090
1091 case ERROR:
1092 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1093 DEFER, FALSE);
1094 return ERROR;
1095 }
1096
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
1100 }
1101 }
1102
1103 /* If we haven't authenticated, but are required to, give up. */
1104
1105 if (require_auth == OK && !smtp_authenticated)
1106 {
1107 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
1109 FALSE);
1110 return DEFER;
1111 }
1112
1113 return OK;
1114 }
1115
1116
1117 /* Construct AUTH appendix string for MAIL TO */
1118 /*
1119 Arguments
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1123
1124 Globals smtp_authenticated
1125 client_authenticated_sender
1126 Return True on error, otherwise buffer has (possibly empty) terminated string
1127 */
1128
1129 BOOL
1130 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1132 {
1133 uschar *local_authenticated_sender = authenticated_sender;
1134
1135 #ifdef notdef
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1137 #endif
1138
1139 if (ob->authenticated_sender != NULL)
1140 {
1141 uschar *new = expand_string(ob->authenticated_sender);
1142 if (new == NULL)
1143 {
1144 if (!expand_string_forcedfail)
1145 {
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
1148 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1149 return TRUE;
1150 }
1151 }
1152 else if (new[0] != 0) local_authenticated_sender = new;
1153 }
1154
1155 /* Add the authenticated sender address if present */
1156
1157 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1159 {
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1164 }
1165 else
1166 *buffer= 0;
1167
1168 return FALSE;
1169 }
1170
1171
1172
1173 #ifdef EXPERIMENTAL_DANE
1174 /* Lookup TLSA record for host/port.
1175 Return: OK success with dnssec; DANE mode
1176 DEFER Do not use this host now, may retry later
1177 FAIL_FORCED No TLSA record; DANE not usable
1178 FAIL Do not use this connection
1179 */
1180
1181 int
1182 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1183 {
1184 /* move this out to host.c given the similarity to dns_lookup() ? */
1185 uschar buffer[300];
1186 const uschar * fullname = buffer;
1187
1188 /* TLSA lookup string */
1189 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1190
1191 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1192 {
1193 case DNS_SUCCEED:
1194 if (!dns_is_secure(dnsa))
1195 {
1196 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1197 return DEFER;
1198 }
1199 return OK;
1200
1201 case DNS_AGAIN:
1202 return DEFER; /* just defer this TLS'd conn */
1203
1204 case DNS_NODATA: /* no TLSA RR for this lookup */
1205 case DNS_NOMATCH: /* no records at all for this lookup */
1206 return dane_required ? FAIL : FAIL_FORCED;
1207
1208 default:
1209 case DNS_FAIL:
1210 return dane_required ? FAIL : DEFER;
1211 }
1212 }
1213 #endif
1214
1215
1216
1217 typedef struct smtp_compare_s
1218 {
1219 uschar *current_sender_address;
1220 struct transport_instance *tblock;
1221 } smtp_compare_t;
1222
1223
1224 /* Create a unique string that identifies this message, it is based on
1225 sender_address, helo_data and tls_certificate if enabled.
1226 */
1227
1228 static uschar *
1229 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1230 {
1231 address_item * addr1;
1232 uschar * if1 = US"";
1233 uschar * helo1 = US"";
1234 #ifdef SUPPORT_TLS
1235 uschar * tlsc1 = US"";
1236 #endif
1237 uschar * save_sender_address = sender_address;
1238 uschar * local_identity = NULL;
1239 smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1241
1242 sender_address = sender;
1243
1244 addr1 = deliver_make_addr (sender, TRUE);
1245 deliver_set_expansions(addr1);
1246
1247 if (ob->interface)
1248 if1 = expand_string(ob->interface);
1249
1250 if (ob->helo_data)
1251 helo1 = expand_string(ob->helo_data);
1252
1253 #ifdef SUPPORT_TLS
1254 if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1257 #else
1258 local_identity = string_sprintf ("%s^%s", if1, helo1);
1259 #endif
1260
1261 deliver_set_expansions(NULL);
1262 sender_address = save_sender_address;
1263
1264 return local_identity;
1265 }
1266
1267
1268
1269 /* This routine is a callback that is called from transport_check_waiting.
1270 This function will evaluate the incoming message versus the previous
1271 message. If the incoming message is using a different local identity then
1272 we will veto this new message. */
1273
1274 static BOOL
1275 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1276 {
1277 uschar * message_local_identity,
1278 * current_local_identity,
1279 * new_sender_address;
1280
1281 current_local_identity =
1282 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1283
1284 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1285 return 0;
1286
1287 message_local_identity =
1288 smtp_local_identity(new_sender_address, s_compare->tblock);
1289
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291 }
1292
1293
1294
1295 static uschar
1296 ehlo_response(uschar * buf, uschar checks)
1297 {
1298 size_t bsize = Ustrlen(buf);
1299
1300 #ifdef SUPPORT_TLS
1301 if ( checks & PEER_OFFERED_TLS
1302 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1303 checks &= ~PEER_OFFERED_TLS;
1304 #endif
1305
1306 if ( checks & PEER_OFFERED_IGNQ
1307 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1308 PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_IGNQ;
1310
1311 if ( checks & PEER_OFFERED_CHUNKING
1312 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1313 checks &= ~PEER_OFFERED_CHUNKING;
1314
1315 #ifndef DISABLE_PRDR
1316 if ( checks & PEER_OFFERED_PRDR
1317 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1318 checks &= ~PEER_OFFERED_PRDR;
1319 #endif
1320
1321 #ifdef SUPPORT_I18N
1322 if ( checks & PEER_OFFERED_UTF8
1323 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_UTF8;
1325 #endif
1326
1327 if ( checks & PEER_OFFERED_DSN
1328 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_DSN;
1330
1331 if ( checks & PEER_OFFERED_PIPE
1332 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PIPE;
1335
1336 if ( checks & PEER_OFFERED_SIZE
1337 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_SIZE;
1339
1340 return checks;
1341 }
1342
1343
1344
1345 /* Callback for emitting a BDAT data chunk header.
1346
1347 If given a nonzero size, first flush any buffered SMTP commands
1348 then emit the command.
1349
1350 Reap previous SMTP command responses if requested, and always reap
1351 the response from a previous BDAT command.
1352
1353 Args:
1354 tctx transport context
1355 chunk_size value for SMTP BDAT command
1356 flags
1357 tc_chunk_last add LAST option to SMTP BDAT command
1358 tc_reap_prev reap response to previous SMTP commands
1359
1360 Returns: OK or ERROR
1361 */
1362
1363 static int
1364 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1365 unsigned flags)
1366 {
1367 smtp_transport_options_block * ob =
1368 (smtp_transport_options_block *)(tctx->tblock->options_block);
1369 smtp_context * sx = tctx->smtp_context;
1370 int cmd_count = 0;
1371 int prev_cmd_count;
1372
1373 /* Write SMTP chunk header command */
1374
1375 if (chunk_size > 0)
1376 {
1377 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
1378 chunk_size,
1379 flags & tc_chunk_last ? " LAST" : "")
1380 ) < 0) return ERROR;
1381 if (flags & tc_chunk_last)
1382 data_command = string_copy(big_buffer); /* Save for later error message */
1383 }
1384
1385 prev_cmd_count = cmd_count += sx->cmd_count;
1386
1387 /* Reap responses for any previous, but not one we just emitted */
1388
1389 if (chunk_size > 0)
1390 prev_cmd_count--;
1391 if (sx->pending_BDAT)
1392 prev_cmd_count--;
1393
1394 if (flags & tc_reap_prev && prev_cmd_count > 0)
1395 {
1396 DEBUG(D_transport) debug_printf("look for %d responses"
1397 " for previous pipelined cmds\n", prev_cmd_count);
1398
1399 switch(sync_responses(sx, prev_cmd_count, 0))
1400 {
1401 case 1: /* 2xx (only) => OK */
1402 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1403 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1404 case 0: break; /* No 2xx or 5xx, but no probs */
1405
1406 case -1: /* Timeout on RCPT */
1407 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1408 }
1409 cmd_count = 1;
1410 if (!sx->pending_BDAT)
1411 pipelining_active = FALSE;
1412 }
1413
1414 /* Reap response for an outstanding BDAT */
1415
1416 if (sx->pending_BDAT)
1417 {
1418 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1419
1420 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1421 ob->command_timeout))
1422 {
1423 if (errno == 0 && sx->buffer[0] == '4')
1424 {
1425 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1426 sx->addrlist->more_errno |=
1427 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1428 }
1429 return ERROR;
1430 }
1431 cmd_count--;
1432 sx->pending_BDAT = FALSE;
1433 pipelining_active = FALSE;
1434 }
1435 else if (chunk_size > 0)
1436 sx->pending_BDAT = TRUE;
1437
1438
1439 sx->cmd_count = cmd_count;
1440 return OK;
1441 }
1442
1443
1444
1445 /*************************************************
1446 * Make connection for given message *
1447 *************************************************/
1448
1449 /*
1450 Arguments:
1451 ctx connection context
1452 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1453 a second attempt after TLS initialization fails
1454
1455 Returns: OK - the connection was made and the delivery attempted;
1456 fd is set in the conn context, tls_out set up.
1457 DEFER - the connection could not be made, or something failed
1458 while setting up the SMTP session, or there was a
1459 non-message-specific error, such as a timeout.
1460 ERROR - helo_data or add_headers or authenticated_sender is
1461 specified for this transport, and the string failed
1462 to expand
1463 */
1464 int
1465 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1466 {
1467 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1468 dns_answer tlsa_dnsa;
1469 #endif
1470 BOOL pass_message = FALSE;
1471 uschar * message = NULL;
1472 int yield = OK;
1473 int rc;
1474
1475 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1476
1477 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1478 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1479 sx->ok = FALSE;
1480 sx->send_rset = TRUE;
1481 sx->send_quit = TRUE;
1482 sx->setting_up = TRUE;
1483 sx->esmtp = TRUE;
1484 sx->esmtp_sent = FALSE;
1485 #ifdef SUPPORT_I18N
1486 sx->utf8_needed = FALSE;
1487 #endif
1488 sx->dsn_all_lasthop = TRUE;
1489 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1490 sx->dane = FALSE;
1491 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1492 #endif
1493
1494 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1495 sx->peer_offered = 0;
1496 sx->igquotstr = US"";
1497 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1498 #ifdef EXPERIMENTAL_DSN_INFO
1499 sx->smtp_greeting = NULL;
1500 sx->helo_response = NULL;
1501 #endif
1502
1503 smtp_command = US"initial connection";
1504 sx->buffer[0] = '\0';
1505
1506 /* Set up the buffer for reading SMTP response packets. */
1507
1508 sx->inblock.buffer = sx->inbuffer;
1509 sx->inblock.buffersize = sizeof(sx->inbuffer);
1510 sx->inblock.ptr = sx->inbuffer;
1511 sx->inblock.ptrend = sx->inbuffer;
1512
1513 /* Set up the buffer for holding SMTP commands while pipelining */
1514
1515 sx->outblock.buffer = sx->outbuffer;
1516 sx->outblock.buffersize = sizeof(sx->outbuffer);
1517 sx->outblock.ptr = sx->outbuffer;
1518 sx->outblock.cmd_count = 0;
1519 sx->outblock.authenticating = FALSE;
1520
1521 /* Reset the parameters of a TLS session. */
1522
1523 tls_out.bits = 0;
1524 tls_out.cipher = NULL; /* the one we may use for this transport */
1525 tls_out.ourcert = NULL;
1526 tls_out.peercert = NULL;
1527 tls_out.peerdn = NULL;
1528 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1529 tls_out.sni = NULL;
1530 #endif
1531 tls_out.ocsp = OCSP_NOT_REQ;
1532
1533 /* Flip the legacy TLS-related variables over to the outbound set in case
1534 they're used in the context of the transport. Don't bother resetting
1535 afterward (when being used by a transport) as we're in a subprocess.
1536 For verify, unflipped once the callout is dealt with */
1537
1538 tls_modify_variables(&tls_out);
1539
1540 #ifndef SUPPORT_TLS
1541 if (sx->smtps)
1542 {
1543 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1544 DEFER, FALSE);
1545 return ERROR;
1546 }
1547 #endif
1548
1549 /* Make a connection to the host if this isn't a continued delivery, and handle
1550 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1551 specially so they can be identified for retries. */
1552
1553 if (continue_hostname == NULL)
1554 {
1555 if (sx->verify)
1556 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1557
1558 /* This puts port into host->port */
1559 sx->inblock.sock = sx->outblock.sock =
1560 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1561 sx->ob->connect_timeout, sx->tblock);
1562
1563 if (sx->inblock.sock < 0)
1564 {
1565 uschar * msg = NULL;
1566 if (sx->verify)
1567 {
1568 msg = US strerror(errno);
1569 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1570 }
1571 set_errno_nohost(sx->addrlist,
1572 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1573 sx->verify ? string_sprintf("could not connect: %s", msg)
1574 : NULL,
1575 DEFER, FALSE);
1576 sx->send_quit = FALSE;
1577 return DEFER;
1578 }
1579
1580 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1581 {
1582 tls_out.dane_verified = FALSE;
1583 tls_out.tlsa_usage = 0;
1584
1585 if (sx->host->dnssec == DS_YES)
1586 {
1587 if( sx->dane_required
1588 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1589 )
1590 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1591 {
1592 case OK: sx->dane = TRUE; break;
1593 case FAIL_FORCED: break;
1594 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1595 string_sprintf("DANE error: tlsa lookup %s",
1596 rc == DEFER ? "DEFER" : "FAIL"),
1597 rc, FALSE);
1598 return rc;
1599 }
1600 }
1601 else if (sx->dane_required)
1602 {
1603 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1604 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1605 FAIL, FALSE);
1606 return FAIL;
1607 }
1608
1609 if (sx->dane)
1610 sx->ob->tls_tempfail_tryclear = FALSE;
1611 }
1612 #endif /*DANE*/
1613
1614 /* Expand the greeting message while waiting for the initial response. (Makes
1615 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1616 delayed till here so that $sending_interface and $sending_port are set. */
1617
1618 if (sx->helo_data)
1619 if (!(sx->helo_data = expand_string(sx->helo_data)))
1620 if (sx->verify)
1621 log_write(0, LOG_MAIN|LOG_PANIC,
1622 "<%s>: failed to expand transport's helo_data value for callout: %s",
1623 sx->addrlist->address, expand_string_message);
1624
1625 #ifdef SUPPORT_I18N
1626 if (sx->helo_data)
1627 {
1628 expand_string_message = NULL;
1629 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1630 &expand_string_message)),
1631 expand_string_message)
1632 if (sx->verify)
1633 log_write(0, LOG_MAIN|LOG_PANIC,
1634 "<%s>: failed to expand transport's helo_data value for callout: %s",
1635 sx->addrlist->address, expand_string_message);
1636 else
1637 sx->helo_data = NULL;
1638 }
1639 #endif
1640
1641 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1642 is nevertheless a reasonably clean way of programming this kind of logic,
1643 where you want to escape on any error. */
1644
1645 if (!sx->smtps)
1646 {
1647 BOOL good_response;
1648
1649 #ifdef TCP_QUICKACK
1650 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1651 #endif
1652 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1653 '2', sx->ob->command_timeout);
1654 #ifdef EXPERIMENTAL_DSN_INFO
1655 sx->smtp_greeting = string_copy(sx->buffer);
1656 #endif
1657 if (!good_response) goto RESPONSE_FAILED;
1658
1659 #ifndef DISABLE_EVENT
1660 {
1661 uschar * s;
1662 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1663 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1664 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1665 if (s)
1666 {
1667 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1668 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1669 DEFER, FALSE);
1670 yield = DEFER;
1671 goto SEND_QUIT;
1672 }
1673 }
1674 #endif
1675
1676 /* Now check if the helo_data expansion went well, and sign off cleanly if
1677 it didn't. */
1678
1679 if (!sx->helo_data)
1680 {
1681 message = string_sprintf("failed to expand helo_data: %s",
1682 expand_string_message);
1683 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1684 yield = DEFER;
1685 goto SEND_QUIT;
1686 }
1687 }
1688
1689 /** Debugging without sending a message
1690 sx->addrlist->transport_return = DEFER;
1691 goto SEND_QUIT;
1692 **/
1693
1694 /* Errors that occur after this point follow an SMTP command, which is
1695 left in big_buffer by smtp_write_command() for use in error messages. */
1696
1697 smtp_command = big_buffer;
1698
1699 /* Tell the remote who we are...
1700
1701 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1702 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1703 greeting is of this form. The assumption was that the far end supports it
1704 properly... but experience shows that there are some that give 5xx responses,
1705 even though the banner includes "ESMTP" (there's a bloody-minded one that
1706 says "ESMTP not spoken here"). Cope with that case.
1707
1708 September 2000: Time has passed, and it seems reasonable now to always send
1709 EHLO at the start. It is also convenient to make the change while installing
1710 the TLS stuff.
1711
1712 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1713 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1714 would be no way to send out the mails, so there is now a host list
1715 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1716 PIPELINING problem as well. Maybe it can also be useful to cure other
1717 problems with broken servers.
1718
1719 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1720 Then somebody tried it with a Microsoft mailer... It seems that all other
1721 mailers use upper case for some reason (the RFC is quite clear about case
1722 independence) so, for peace of mind, I gave in. */
1723
1724 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1725
1726 /* Alas; be careful, since this goto is not an error-out, so conceivably
1727 we might set data between here and the target which we assume to exist
1728 and be usable. I can see this coming back to bite us. */
1729 #ifdef SUPPORT_TLS
1730 if (sx->smtps)
1731 {
1732 smtp_peer_options |= PEER_OFFERED_TLS;
1733 suppress_tls = FALSE;
1734 sx->ob->tls_tempfail_tryclear = FALSE;
1735 smtp_command = US"SSL-on-connect";
1736 goto TLS_NEGOTIATE;
1737 }
1738 #endif
1739
1740 if (sx->esmtp)
1741 {
1742 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1743 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1744 goto SEND_FAILED;
1745 sx->esmtp_sent = TRUE;
1746 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1747 sx->ob->command_timeout))
1748 {
1749 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1750 {
1751 #ifdef EXPERIMENTAL_DSN_INFO
1752 sx->helo_response = string_copy(sx->buffer);
1753 #endif
1754 goto RESPONSE_FAILED;
1755 }
1756 sx->esmtp = FALSE;
1757 }
1758 #ifdef EXPERIMENTAL_DSN_INFO
1759 sx->helo_response = string_copy(sx->buffer);
1760 #endif
1761 }
1762 else
1763 DEBUG(D_transport)
1764 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1765
1766 if (!sx->esmtp)
1767 {
1768 BOOL good_response;
1769 int n = sizeof(sx->buffer);
1770 uschar * rsp = sx->buffer;
1771
1772 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1773 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1774
1775 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1776 goto SEND_FAILED;
1777 good_response = smtp_read_response(&sx->inblock, rsp, n,
1778 '2', sx->ob->command_timeout);
1779 #ifdef EXPERIMENTAL_DSN_INFO
1780 sx->helo_response = string_copy(rsp);
1781 #endif
1782 if (!good_response)
1783 {
1784 /* Handle special logging for a closed connection after HELO
1785 when had previously sent EHLO */
1786
1787 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1788 {
1789 errno = ERRNO_SMTPCLOSED;
1790 goto EHLOHELO_FAILED;
1791 }
1792 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1793 goto RESPONSE_FAILED;
1794 }
1795 }
1796
1797 sx->peer_offered = smtp_peer_options = 0;
1798
1799 if (sx->esmtp || sx->lmtp)
1800 {
1801 sx->peer_offered = ehlo_response(sx->buffer,
1802 PEER_OFFERED_TLS /* others checked later */
1803 );
1804
1805 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1806
1807 #ifdef SUPPORT_TLS
1808 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1809 #endif
1810 }
1811 }
1812
1813 /* For continuing deliveries down the same channel, having re-exec'd the socket
1814 is the standard input; for a socket held open from verify it is recorded
1815 in the cutthrough context block. Either way we don't need to redo EHLO here
1816 (but may need to do so for TLS - see below).
1817 Set up the pointer to where subsequent commands will be left, for
1818 error messages. Note that smtp_peer_options will have been
1819 set from the command line if they were set in the process that passed the
1820 connection on. */
1821
1822 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1823 as the continue goes via transport_pass_socket() and doublefork and exec.
1824 It does not wait. Unclear how we keep separate host's responses
1825 separate - we could match up by host ip+port as a bodge. */
1826
1827 else
1828 {
1829 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1830 {
1831 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1832 sx->host->port = sx->port = cutthrough.host.port;
1833 }
1834 else
1835 {
1836 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1837 sx->host->port = sx->port; /* Record the port that was used */
1838 }
1839 smtp_command = big_buffer;
1840 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1841
1842 /* For a continued connection with TLS being proxied for us, or a
1843 held-open verify connection with TLS, nothing more to do. */
1844
1845 if ( continue_proxy_cipher
1846 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1847 )
1848 {
1849 sx->peer_offered = smtp_peer_options;
1850 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1851 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1852 continue_proxy_cipher ? "proxied" : "verify conn with");
1853 return OK;
1854 }
1855 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1856 }
1857
1858 /* If TLS is available on this connection, whether continued or not, attempt to
1859 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1860 send another EHLO - the server may give a different answer in secure mode. We
1861 use a separate buffer for reading the response to STARTTLS so that if it is
1862 negative, the original EHLO data is available for subsequent analysis, should
1863 the client not be required to use TLS. If the response is bad, copy the buffer
1864 for error analysis. */
1865
1866 #ifdef SUPPORT_TLS
1867 if ( smtp_peer_options & PEER_OFFERED_TLS
1868 && !suppress_tls
1869 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1870 && ( !sx->verify
1871 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1872 ) )
1873 {
1874 uschar buffer2[4096];
1875 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1876 goto SEND_FAILED;
1877
1878 /* If there is an I/O error, transmission of this message is deferred. If
1879 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1880 false, we also defer. However, if there is a temporary rejection of STARTTLS
1881 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1882 STARTTLS, we carry on. This means we will try to send the message in clear,
1883 unless the host is in hosts_require_tls (tested below). */
1884
1885 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1886 sx->ob->command_timeout))
1887 {
1888 if ( errno != 0
1889 || buffer2[0] == 0
1890 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1891 )
1892 {
1893 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1894 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1895 goto RESPONSE_FAILED;
1896 }
1897 }
1898
1899 /* STARTTLS accepted: try to negotiate a TLS session. */
1900
1901 else
1902 TLS_NEGOTIATE:
1903 {
1904 address_item * addr;
1905 uschar * errstr;
1906 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1907 # ifdef EXPERIMENTAL_DANE
1908 sx->dane ? &tlsa_dnsa : NULL,
1909 # endif
1910 &errstr);
1911
1912 /* TLS negotiation failed; give an error. From outside, this function may
1913 be called again to try in clear on a new connection, if the options permit
1914 it for this host. */
1915
1916 if (rc != OK)
1917 {
1918 # ifdef EXPERIMENTAL_DANE
1919 if (sx->dane) log_write(0, LOG_MAIN,
1920 "DANE attempt failed; TLS connection to %s [%s]: %s",
1921 sx->host->name, sx->host->address, errstr);
1922 # endif
1923
1924 errno = ERRNO_TLSFAILURE;
1925 message = string_sprintf("TLS session: %s", errstr);
1926 sx->send_quit = FALSE;
1927 goto TLS_FAILED;
1928 }
1929
1930 /* TLS session is set up */
1931
1932 smtp_peer_options_wrap = smtp_peer_options;
1933 for (addr = sx->addrlist; addr; addr = addr->next)
1934 if (addr->transport_return == PENDING_DEFER)
1935 {
1936 addr->cipher = tls_out.cipher;
1937 addr->ourcert = tls_out.ourcert;
1938 addr->peercert = tls_out.peercert;
1939 addr->peerdn = tls_out.peerdn;
1940 addr->ocsp = tls_out.ocsp;
1941 }
1942 }
1943 }
1944
1945 /* if smtps, we'll have smtp_command set to something else; always safe to
1946 reset it here. */
1947 smtp_command = big_buffer;
1948
1949 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1950 helo_data is null, we are dealing with a connection that was passed from
1951 another process, and so we won't have expanded helo_data above. We have to
1952 expand it here. $sending_ip_address and $sending_port are set up right at the
1953 start of the Exim process (in exim.c). */
1954
1955 if (tls_out.active >= 0)
1956 {
1957 char *greeting_cmd;
1958 BOOL good_response;
1959
1960 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1961 {
1962 uschar *message = string_sprintf("failed to expand helo_data: %s",
1963 expand_string_message);
1964 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1965 yield = DEFER;
1966 goto SEND_QUIT;
1967 }
1968
1969 /* For SMTPS we need to wait for the initial OK response. */
1970 if (sx->smtps)
1971 {
1972 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1973 '2', sx->ob->command_timeout);
1974 #ifdef EXPERIMENTAL_DSN_INFO
1975 sx->smtp_greeting = string_copy(sx->buffer);
1976 #endif
1977 if (!good_response) goto RESPONSE_FAILED;
1978 }
1979
1980 if (sx->esmtp)
1981 greeting_cmd = "EHLO";
1982 else
1983 {
1984 greeting_cmd = "HELO";
1985 DEBUG(D_transport)
1986 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1987 }
1988
1989 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1990 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1991 goto SEND_FAILED;
1992 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1993 '2', sx->ob->command_timeout);
1994 #ifdef EXPERIMENTAL_DSN_INFO
1995 sx->helo_response = string_copy(sx->buffer);
1996 #endif
1997 if (!good_response) goto RESPONSE_FAILED;
1998 smtp_peer_options = 0;
1999 }
2000
2001 /* If the host is required to use a secure channel, ensure that we
2002 have one. */
2003
2004 else if ( sx->smtps
2005 # ifdef EXPERIMENTAL_DANE
2006 || sx->dane
2007 # endif
2008 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2009 )
2010 {
2011 errno = ERRNO_TLSREQUIRED;
2012 message = string_sprintf("a TLS session is required, but %s",
2013 smtp_peer_options & PEER_OFFERED_TLS
2014 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2015 goto TLS_FAILED;
2016 }
2017 #endif /*SUPPORT_TLS*/
2018
2019 /* If TLS is active, we have just started it up and re-done the EHLO command,
2020 so its response needs to be analyzed. If TLS is not active and this is a
2021 continued session down a previously-used socket, we haven't just done EHLO, so
2022 we skip this. */
2023
2024 if (continue_hostname == NULL
2025 #ifdef SUPPORT_TLS
2026 || tls_out.active >= 0
2027 #endif
2028 )
2029 {
2030 if (sx->esmtp || sx->lmtp)
2031 {
2032 sx->peer_offered = ehlo_response(sx->buffer,
2033 0 /* no TLS */
2034 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2035 | PEER_OFFERED_CHUNKING
2036 | PEER_OFFERED_PRDR
2037 #ifdef SUPPORT_I18N
2038 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2039 /*XXX if we hand peercaps on to continued-conn processes,
2040 must not depend on this addr */
2041 #endif
2042 | PEER_OFFERED_DSN
2043 | PEER_OFFERED_PIPE
2044 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2045 );
2046
2047 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2048 lmtp_ignore_quota option was set. */
2049
2050 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2051
2052 /* If the response to EHLO specified support for the SIZE parameter, note
2053 this, provided size_addition is non-negative. */
2054
2055 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2056
2057 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2058 the current host, esmtp will be false, so PIPELINING can never be used. If
2059 the current host matches hosts_avoid_pipelining, don't do it. */
2060
2061 if ( sx->peer_offered & PEER_OFFERED_PIPE
2062 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2063 smtp_peer_options |= PEER_OFFERED_PIPE;
2064
2065 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2066 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2067
2068 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2069 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2070 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2071
2072 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2073 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2074
2075 #ifndef DISABLE_PRDR
2076 if ( sx->peer_offered & PEER_OFFERED_PRDR
2077 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2078 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2079
2080 if (sx->peer_offered & PEER_OFFERED_PRDR)
2081 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2082 #endif
2083
2084 /* Note if the server supports DSN */
2085 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2086 DEBUG(D_transport) debug_printf("%susing DSN\n",
2087 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2088
2089 /* Note if the response to EHLO specifies support for the AUTH extension.
2090 If it has, check that this host is one we want to authenticate to, and do
2091 the business. The host name and address must be available when the
2092 authenticator's client driver is running. */
2093
2094 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2095 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2096 {
2097 default: goto SEND_QUIT;
2098 case OK: break;
2099 case FAIL_SEND: goto SEND_FAILED;
2100 case FAIL: goto RESPONSE_FAILED;
2101 }
2102 }
2103 }
2104 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2105
2106 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2107 message-specific. */
2108
2109 sx->setting_up = FALSE;
2110
2111 #ifdef SUPPORT_I18N
2112 if (sx->addrlist->prop.utf8_msg)
2113 {
2114 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2115 && !sx->addrlist->prop.utf8_downcvt_maybe;
2116 DEBUG(D_transport) if (!sx->utf8_needed)
2117 debug_printf("utf8: %s downconvert\n",
2118 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2119 }
2120
2121 /* If this is an international message we need the host to speak SMTPUTF8 */
2122 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2123 {
2124 errno = ERRNO_UTF8_FWD;
2125 goto RESPONSE_FAILED;
2126 }
2127 #endif
2128
2129 return OK;
2130
2131
2132 {
2133 int code;
2134
2135 RESPONSE_FAILED:
2136 message = NULL;
2137 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2138 sx->buffer, &code, &message, &pass_message);
2139 goto FAILED;
2140
2141 SEND_FAILED:
2142 code = '4';
2143 message = US string_sprintf("send() to %s [%s] failed: %s",
2144 sx->host->name, sx->host->address, strerror(errno));
2145 sx->send_quit = FALSE;
2146 goto FAILED;
2147
2148 /* This label is jumped to directly when a TLS negotiation has failed,
2149 or was not done for a host for which it is required. Values will be set
2150 in message and errno, and setting_up will always be true. Treat as
2151 a temporary error. */
2152
2153 EHLOHELO_FAILED:
2154 code = '4';
2155 message = string_sprintf("Remote host closed connection in response to %s"
2156 " (EHLO response was: %s)", smtp_command, sx->buffer);
2157 sx->send_quit = FALSE;
2158 goto FAILED;
2159
2160 #ifdef SUPPORT_TLS
2161 TLS_FAILED:
2162 code = '4';
2163 goto FAILED;
2164 #endif
2165
2166 /* The failure happened while setting up the call; see if the failure was
2167 a 5xx response (this will either be on connection, or following HELO - a 5xx
2168 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2169 never going to accept them. For other errors during setting up (timeouts or
2170 whatever), defer all addresses, and yield DEFER, so that the host is not
2171 tried again for a while. */
2172
2173 FAILED:
2174 sx->ok = FALSE; /* For when reached by GOTO */
2175
2176 yield = code == '5'
2177 #ifdef SUPPORT_I18N
2178 || errno == ERRNO_UTF8_FWD
2179 #endif
2180 ? FAIL : DEFER;
2181
2182 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2183 #ifdef EXPERIMENTAL_DSN_INFO
2184 , sx->smtp_greeting, sx->helo_response
2185 #endif
2186 );
2187 }
2188
2189
2190 SEND_QUIT:
2191
2192 if (sx->send_quit)
2193 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2194
2195 #ifdef SUPPORT_TLS
2196 tls_close(FALSE, TRUE);
2197 #endif
2198
2199 /* Close the socket, and return the appropriate value, first setting
2200 works because the NULL setting is passed back to the calling process, and
2201 remote_max_parallel is forced to 1 when delivering over an existing connection,
2202
2203 If all went well and continue_more is set, we shouldn't actually get here if
2204 there are further addresses, as the return above will be taken. However,
2205 writing RSET might have failed, or there may be other addresses whose hosts are
2206 specified in the transports, and therefore not visible at top level, in which
2207 case continue_more won't get set. */
2208
2209 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2210 if (sx->send_quit)
2211 {
2212 shutdown(sx->outblock.sock, SHUT_WR);
2213 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2214 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2215 rc--; /* drain socket */
2216 sx->send_quit = FALSE;
2217 }
2218 (void)close(sx->inblock.sock);
2219 sx->inblock.sock = sx->outblock.sock = -1;
2220
2221 #ifndef DISABLE_EVENT
2222 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2223 #endif
2224
2225 continue_transport = NULL;
2226 continue_hostname = NULL;
2227 return yield;
2228 }
2229
2230
2231
2232
2233 /* Create the string of options that will be appended to the MAIL FROM:
2234 in the connection context buffer */
2235
2236 static int
2237 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2238 {
2239 uschar * p = sx->buffer;
2240 address_item * addr;
2241 int address_count;
2242
2243 *p = 0;
2244
2245 /* If we know the receiving MTA supports the SIZE qualification,
2246 send it, adding something to the message size to allow for imprecision
2247 and things that get added en route. Exim keeps the number of lines
2248 in a message, so we can give an accurate value for the original message, but we
2249 need some additional to handle added headers. (Double "." characters don't get
2250 included in the count.) */
2251
2252 if (sx->peer_offered & PEER_OFFERED_SIZE)
2253 {
2254 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2255 while (*p) p++;
2256 }
2257
2258 #ifndef DISABLE_PRDR
2259 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2260 request that */
2261
2262 sx->prdr_active = FALSE;
2263 if (sx->peer_offered & PEER_OFFERED_PRDR)
2264 for (addr = addrlist; addr; addr = addr->next)
2265 if (addr->transport_return == PENDING_DEFER)
2266 {
2267 for (addr = addr->next; addr; addr = addr->next)
2268 if (addr->transport_return == PENDING_DEFER)
2269 { /* at least two recipients to send */
2270 sx->prdr_active = TRUE;
2271 sprintf(CS p, " PRDR"); p += 5;
2272 break;
2273 }
2274 break;
2275 }
2276 #endif
2277
2278 #ifdef SUPPORT_I18N
2279 /* If it supports internationalised messages, and this meesage need that,
2280 request it */
2281
2282 if ( sx->peer_offered & PEER_OFFERED_UTF8
2283 && addrlist->prop.utf8_msg
2284 && !addrlist->prop.utf8_downcvt
2285 )
2286 Ustrcpy(p, " SMTPUTF8"), p += 9;
2287 #endif
2288
2289 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2290 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2291 addr && address_count < sx->max_rcpt;
2292 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2293 {
2294 address_count++;
2295 if (!(addr->dsn_flags & rf_dsnlasthop))
2296 {
2297 sx->dsn_all_lasthop = FALSE;
2298 break;
2299 }
2300 }
2301
2302 /* Add any DSN flags to the mail command */
2303
2304 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2305 {
2306 if (dsn_ret == dsn_ret_hdrs)
2307 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2308 else if (dsn_ret == dsn_ret_full)
2309 { Ustrcpy(p, " RET=FULL"); p += 9; }
2310
2311 if (dsn_envid)
2312 {
2313 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2314 while (*p) p++;
2315 }
2316 }
2317
2318 /* If an authenticated_sender override has been specified for this transport
2319 instance, expand it. If the expansion is forced to fail, and there was already
2320 an authenticated_sender for this message, the original value will be used.
2321 Other expansion failures are serious. An empty result is ignored, but there is
2322 otherwise no check - this feature is expected to be used with LMTP and other
2323 cases where non-standard addresses (e.g. without domains) might be required. */
2324
2325 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2326 return ERROR;
2327
2328 return OK;
2329 }
2330
2331
2332 static void
2333 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2334 {
2335 uschar * p = sx->buffer;
2336 *p = 0;
2337
2338 /* Add any DSN flags to the rcpt command */
2339
2340 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2341 {
2342 if (addr->dsn_flags & rf_dsnflags)
2343 {
2344 int i;
2345 BOOL first = TRUE;
2346
2347 Ustrcpy(p, " NOTIFY=");
2348 while (*p) p++;
2349 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2350 {
2351 if (!first) *p++ = ',';
2352 first = FALSE;
2353 Ustrcpy(p, rf_names[i]);
2354 while (*p) p++;
2355 }
2356 }
2357
2358 if (addr->dsn_orcpt)
2359 {
2360 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2361 addr->dsn_orcpt);
2362 while (*p) p++;
2363 }
2364 }
2365 }
2366
2367
2368
2369 /*
2370 Return:
2371 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2372 -1 MAIL response error
2373 -2 any non-MAIL read i/o error
2374 -3 non-MAIL response timeout
2375 -4 internal error; channel still usable
2376 -5 transmit failed
2377 */
2378
2379 int
2380 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2381 {
2382 address_item * addr;
2383 int address_count;
2384 int rc;
2385
2386 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2387 {
2388 *yield = ERROR;
2389 return -4;
2390 }
2391
2392 /* From here until we send the DATA command, we can make use of PIPELINING
2393 if the server host supports it. The code has to be able to check the responses
2394 at any point, for when the buffer fills up, so we write it totally generally.
2395 When PIPELINING is off, each command written reports that it has flushed the
2396 buffer. */
2397
2398 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2399
2400 {
2401 uschar * s = sx->from_addr;
2402 #ifdef SUPPORT_I18N
2403 uschar * errstr = NULL;
2404
2405 /* If we must downconvert, do the from-address here. Remember we had to
2406 for the to-addresses (done below), and also (ugly) for re-doing when building
2407 the delivery log line. */
2408
2409 if ( sx->addrlist->prop.utf8_msg
2410 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2411 )
2412 {
2413 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2414 {
2415 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2416 *yield = ERROR;
2417 return -4;
2418 }
2419 setflag(sx->addrlist, af_utf8_downcvt);
2420 }
2421 #endif
2422
2423 rc = smtp_write_command(&sx->outblock, pipelining_active,
2424 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2425 }
2426
2427 mail_command = string_copy(big_buffer); /* Save for later error message */
2428
2429 switch(rc)
2430 {
2431 case -1: /* Transmission error */
2432 return -5;
2433
2434 case +1: /* Cmd was sent */
2435 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2436 sx->ob->command_timeout))
2437 {
2438 if (errno == 0 && sx->buffer[0] == '4')
2439 {
2440 errno = ERRNO_MAIL4XX;
2441 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2442 }
2443 return -1;
2444 }
2445 sx->pending_MAIL = FALSE;
2446 break;
2447
2448 /* otherwise zero: command queued for pipeline */
2449 }
2450
2451 /* Pass over all the relevant recipient addresses for this host, which are the
2452 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2453 several before we have to read the responses for those seen so far. This
2454 checking is done by a subroutine because it also needs to be done at the end.
2455 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2456 the next one if not all are sent.
2457
2458 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2459 last address because we want to abort if any recipients have any kind of
2460 problem, temporary or permanent. We know that all recipient addresses will have
2461 the PENDING_DEFER status, because only one attempt is ever made, and we know
2462 that max_rcpt will be large, so all addresses will be done at once.
2463
2464 For verify we flush the pipeline after any (the only) rcpt address. */
2465
2466 for (addr = sx->first_addr, address_count = 0;
2467 addr && address_count < sx->max_rcpt;
2468 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2469 {
2470 int count;
2471 BOOL no_flush;
2472 uschar * rcpt_addr;
2473
2474 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2475 ? dsn_support_yes : dsn_support_no;
2476
2477 address_count++;
2478 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
2479
2480 build_rcptcmd_options(sx, addr);
2481
2482 /* Now send the RCPT command, and process outstanding responses when
2483 necessary. After a timeout on RCPT, we just end the function, leaving the
2484 yield as OK, because this error can often mean that there is a problem with
2485 just one address, so we don't want to delay the host. */
2486
2487 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2488
2489 #ifdef SUPPORT_I18N
2490 if ( testflag(sx->addrlist, af_utf8_downcvt)
2491 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2492 )
2493 {
2494 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2495 errno = ERRNO_EXPANDFAIL;
2496 return -5; /*XXX too harsh? */
2497 }
2498 #endif
2499
2500 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2501 rcpt_addr, sx->igquotstr, sx->buffer);
2502
2503 if (count < 0) return -5;
2504 if (count > 0)
2505 {
2506 switch(sync_responses(sx, count, 0))
2507 {
2508 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2509 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2510 break;
2511
2512 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2513 if (!sx->lmtp) /* can't tell about progress yet */
2514 sx->completed_addr = TRUE;
2515 case 0: /* No 2xx or 5xx, but no probs */
2516 break;
2517
2518 case -1: return -3; /* Timeout on RCPT */
2519 case -2: return -2; /* non-MAIL read i/o error */
2520 default: return -1; /* any MAIL error */
2521 }
2522 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2523 }
2524 } /* Loop for next address */
2525
2526 sx->next_addr = addr;
2527 return 0;
2528 }
2529
2530
2531 #ifdef SUPPORT_TLS
2532 /*****************************************************
2533 * Proxy TLS connection for another transport process *
2534 ******************************************************/
2535 /*
2536 Use the given buffer as a staging area, and select on both the given fd
2537 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2538 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2539 under a timeout.
2540
2541 Arguments:
2542 buf space to use for buffering
2543 bufsiz size of buffer
2544 proxy_fd comms to proxied process
2545 timeout per-read timeout, seconds
2546 */
2547
2548 void
2549 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2550 {
2551 fd_set fds;
2552 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2553 int rc, i, fd_bits, nbytes;
2554
2555 set_process_info("proxying TLS connection for continued transport");
2556 FD_ZERO(&fds);
2557 FD_SET(tls_out.active, &fds);
2558 FD_SET(proxy_fd, &fds);
2559
2560 for (fd_bits = 3; fd_bits; )
2561 {
2562 time_t time_left = timeout;
2563 time_t time_start = time(NULL);
2564
2565 /* wait for data */
2566 do
2567 {
2568 struct timeval tv = { time_left, 0 };
2569
2570 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2571
2572 if (rc < 0 && errno == EINTR)
2573 if ((time_left -= time(NULL) - time_start) > 0) continue;
2574
2575 if (rc <= 0)
2576 {
2577 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2578 return;
2579 }
2580 }
2581 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2582
2583 /* handle inbound data */
2584 if (FD_ISSET(tls_out.active, &fds))
2585 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2586 {
2587 fd_bits &= ~1;
2588 FD_CLR(tls_out.active, &fds);
2589 shutdown(proxy_fd, SHUT_WR);
2590 }
2591 else
2592 {
2593 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2594 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2595 }
2596 else if (fd_bits & 1)
2597 FD_SET(tls_out.active, &fds);
2598
2599 /* handle outbound data */
2600 if (FD_ISSET(proxy_fd, &fds))
2601 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2602 {
2603 fd_bits &= ~2;
2604 FD_CLR(proxy_fd, &fds);
2605 shutdown(tls_out.active, SHUT_WR);
2606 }
2607 else
2608 {
2609 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2610 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2611 }
2612 else if (fd_bits & 2)
2613 FD_SET(proxy_fd, &fds);
2614 }
2615 }
2616 #endif
2617
2618
2619 /*************************************************
2620 * Deliver address list to given host *
2621 *************************************************/
2622
2623 /* If continue_hostname is not null, we get here only when continuing to
2624 deliver down an existing channel. The channel was passed as the standard
2625 input. TLS is never active on a passed channel; the previous process always
2626 closes it down before passing the connection on.
2627
2628 Otherwise, we have to make a connection to the remote host, and do the
2629 initial protocol exchange.
2630
2631 When running as an MUA wrapper, if the sender or any recipient is rejected,
2632 temporarily or permanently, we force failure for all recipients.
2633
2634 Arguments:
2635 addrlist chain of potential addresses to deliver; only those whose
2636 transport_return field is set to PENDING_DEFER are currently
2637 being processed; others should be skipped - they have either
2638 been delivered to an earlier host or IP address, or been
2639 failed by one of them.
2640 host host to deliver to
2641 host_af AF_INET or AF_INET6
2642 port default TCP/IP port to use, in host byte order
2643 interface interface to bind to, or NULL
2644 tblock transport instance block
2645 message_defer set TRUE if yield is OK, but all addresses were deferred
2646 because of a non-recipient, non-host failure, that is, a
2647 4xx response to MAIL FROM, DATA, or ".". This is a defer
2648 that is specific to the message.
2649 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2650 a second attempt after TLS initialization fails
2651
2652 Returns: OK - the connection was made and the delivery attempted;
2653 the result for each address is in its data block.
2654 DEFER - the connection could not be made, or something failed
2655 while setting up the SMTP session, or there was a
2656 non-message-specific error, such as a timeout.
2657 ERROR - a filter command is specified for this transport,
2658 and there was a problem setting it up; OR helo_data
2659 or add_headers or authenticated_sender is specified
2660 for this transport, and the string failed to expand
2661 */
2662
2663 static int
2664 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2665 uschar *interface, transport_instance *tblock,
2666 BOOL *message_defer, BOOL suppress_tls)
2667 {
2668 address_item *addr;
2669 int yield = OK;
2670 int save_errno;
2671 int rc;
2672 time_t start_delivery_time = time(NULL);
2673
2674 BOOL pass_message = FALSE;
2675 uschar *message = NULL;
2676 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2677 uschar *p;
2678
2679 smtp_context sx;
2680
2681 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2682 *message_defer = FALSE;
2683
2684 sx.addrlist = addrlist;
2685 sx.host = host;
2686 sx.host_af = host_af,
2687 sx.port = port;
2688 sx.interface = interface;
2689 sx.helo_data = NULL;
2690 sx.tblock = tblock;
2691 sx.verify = FALSE;
2692
2693 /* Get the channel set up ready for a message (MAIL FROM being the next
2694 SMTP command to send */
2695
2696 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2697 return rc;
2698
2699 /* If there is a filter command specified for this transport, we can now
2700 set it up. This cannot be done until the identify of the host is known. */
2701
2702 if (tblock->filter_command)
2703 {
2704 transport_filter_timeout = tblock->filter_timeout;
2705
2706 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2707 yield ERROR. */
2708
2709 if (!transport_set_up_command(&transport_filter_argv,
2710 tblock->filter_command, TRUE, DEFER, addrlist,
2711 string_sprintf("%.50s transport", tblock->name), NULL))
2712 {
2713 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2714 FALSE);
2715 yield = ERROR;
2716 goto SEND_QUIT;
2717 }
2718
2719 if ( transport_filter_argv
2720 && *transport_filter_argv
2721 && **transport_filter_argv
2722 && sx.peer_offered & PEER_OFFERED_CHUNKING
2723 )
2724 {
2725 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2726 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2727 }
2728 }
2729
2730 sx.first_addr = addrlist;
2731
2732 /* For messages that have more than the maximum number of envelope recipients,
2733 we want to send several transactions down the same SMTP connection. (See
2734 comments in deliver.c as to how this reconciles, heuristically, with
2735 remote_max_parallel.) This optimization was added to Exim after the following
2736 code was already working. The simplest way to put it in without disturbing the
2737 code was to use a goto to jump back to this point when there is another
2738 transaction to handle. */
2739
2740 SEND_MESSAGE:
2741 sx.from_addr = return_path;
2742 sx.sync_addr = sx.first_addr;
2743 sx.ok = FALSE;
2744 sx.send_rset = TRUE;
2745 sx.completed_addr = FALSE;
2746
2747
2748 /* If we are a continued-connection-after-verify the MAIL and RCPT
2749 commands were already sent; do not re-send but do mark the addrs as
2750 having been accepted up to RCPT stage. A traditional cont-conn
2751 always has a sequence number greater than one. */
2752
2753 if (continue_hostname && continue_sequence == 1)
2754 {
2755 address_item * addr;
2756
2757 sx.peer_offered = smtp_peer_options;
2758 sx.pending_MAIL = FALSE;
2759 sx.ok = TRUE;
2760 sx.next_addr = NULL;
2761
2762 for (addr = addrlist; addr; addr = addr->next)
2763 addr->transport_return = PENDING_OK;
2764 }
2765 else
2766 {
2767 /* Initiate a message transfer. */
2768
2769 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2770 {
2771 case 0: break;
2772 case -1: case -2: goto RESPONSE_FAILED;
2773 case -3: goto END_OFF;
2774 case -4: goto SEND_QUIT;
2775 default: goto SEND_FAILED;
2776 }
2777
2778 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2779 permanently or temporarily. We should have flushed and synced after the last
2780 RCPT. */
2781
2782 if (mua_wrapper)
2783 {
2784 address_item *badaddr;
2785 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2786 if (badaddr->transport_return != PENDING_OK)
2787 {
2788 /*XXX could we find a better errno than 0 here? */
2789 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2790 testflag(badaddr, af_pass_message));
2791 sx.ok = FALSE;
2792 break;
2793 }
2794 }
2795 }
2796
2797 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2798 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2799 have a good recipient buffered up if we are pipelining. We don't want to waste
2800 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2801 are pipelining. The responses are all handled by sync_responses().
2802 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2803 to send is. */
2804
2805 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2806 && (sx.ok || (pipelining_active && !mua_wrapper)))
2807 {
2808 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2809
2810 if (count < 0) goto SEND_FAILED;
2811 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2812 {
2813 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2814 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2815 break;
2816
2817 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2818 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2819 case 0: break; /* No 2xx or 5xx, but no probs */
2820
2821 case -1: goto END_OFF; /* Timeout on RCPT */
2822 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2823 }
2824 pipelining_active = FALSE;
2825 data_command = string_copy(big_buffer); /* Save for later error message */
2826 }
2827
2828 /* If there were no good recipients (but otherwise there have been no
2829 problems), just set ok TRUE, since we have handled address-specific errors
2830 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2831 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2832 well as body. Set the appropriate timeout value to be used for each chunk.
2833 (Haven't been able to make it work using select() for writing yet.) */
2834
2835 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2836 {
2837 /* Save the first address of the next batch. */
2838 sx.first_addr = sx.next_addr;
2839
2840 sx.ok = TRUE;
2841 }
2842 else
2843 {
2844 transport_ctx tctx = {
2845 tblock,
2846 addrlist,
2847 US".", US"..", /* Escaping strings */
2848 topt_use_crlf | topt_escape_headers
2849 | (tblock->body_only ? topt_no_headers : 0)
2850 | (tblock->headers_only ? topt_no_body : 0)
2851 | (tblock->return_path_add ? topt_add_return_path : 0)
2852 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2853 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2854 };
2855
2856 /* If using CHUNKING we need a callback from the generic transport
2857 support to us, for the sending of BDAT smtp commands and the reaping
2858 of responses. The callback needs a whole bunch of state so set up
2859 a transport-context structure to be passed around. */
2860
2861 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2862 {
2863 tctx.check_string = tctx.escape_string = NULL;
2864 tctx.options |= topt_use_bdat;
2865 tctx.chunk_cb = smtp_chunk_cmd_callback;
2866 sx.pending_BDAT = FALSE;
2867 sx.good_RCPT = sx.ok;
2868 sx.cmd_count = 0;
2869 tctx.smtp_context = &sx;
2870 }
2871 else
2872 tctx.options |= topt_end_dot;
2873
2874 /* Save the first address of the next batch. */
2875 sx.first_addr = sx.next_addr;
2876
2877 /* Responses from CHUNKING commands go in buffer. Otherwise,
2878 there has not been a response. */
2879
2880 sx.buffer[0] = 0;
2881
2882 sigalrm_seen = FALSE;
2883 transport_write_timeout = sx.ob->data_timeout;
2884 smtp_command = US"sending data block"; /* For error messages */
2885 DEBUG(D_transport|D_v)
2886 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2887 debug_printf(" will write message using CHUNKING\n");
2888 else
2889 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2890 transport_count = 0;
2891
2892 #ifndef DISABLE_DKIM
2893 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim,
2894 CUSS &message);
2895 #else
2896 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2897 #endif
2898
2899 /* transport_write_message() uses write() because it is called from other
2900 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2901 it can exit with "Broken pipe" as its error. This really means that the
2902 socket got closed at the far end. */
2903
2904 transport_write_timeout = 0; /* for subsequent transports */
2905
2906 /* Failure can either be some kind of I/O disaster (including timeout),
2907 or the failure of a transport filter or the expansion of added headers.
2908 Or, when CHUNKING, it can be a protocol-detected failure. */
2909
2910 if (!sx.ok)
2911 if (message) goto SEND_FAILED;
2912 else goto RESPONSE_FAILED;
2913
2914 /* We used to send the terminating "." explicitly here, but because of
2915 buffering effects at both ends of TCP/IP connections, you don't gain
2916 anything by keeping it separate, so it might as well go in the final
2917 data buffer for efficiency. This is now done by setting the topt_end_dot
2918 flag above. */
2919
2920 smtp_command = US"end of data";
2921
2922 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2923 {
2924 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2925 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2926 {
2927 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2928 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2929 break;
2930
2931 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2932 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2933 case 0: break; /* No 2xx or 5xx, but no probs */
2934
2935 case -1: goto END_OFF; /* Timeout on RCPT */
2936 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2937 }
2938 }
2939
2940 #ifndef DISABLE_PRDR
2941 /* For PRDR we optionally get a partial-responses warning
2942 * followed by the individual responses, before going on with
2943 * the overall response. If we don't get the warning then deal
2944 * with per non-PRDR. */
2945 if(sx.prdr_active)
2946 {
2947 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2948 sx.ob->final_timeout);
2949 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2950 {
2951 case '2': sx.prdr_active = FALSE;
2952 sx.ok = TRUE;
2953 break;
2954 case '4': errno = ERRNO_DATA4XX;
2955 addrlist->more_errno |=
2956 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2957 break;
2958 }
2959 }
2960 else
2961 #endif
2962
2963 /* For non-PRDR SMTP, we now read a single response that applies to the
2964 whole message. If it is OK, then all the addresses have been delivered. */
2965
2966 if (!sx.lmtp)
2967 {
2968 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2969 sx.ob->final_timeout);
2970 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2971 {
2972 errno = ERRNO_DATA4XX;
2973 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2974 }
2975 }
2976
2977 /* For LMTP, we get back a response for every RCPT command that we sent;
2978 some may be accepted and some rejected. For those that get a response, their
2979 status is fixed; any that are accepted have been handed over, even if later
2980 responses crash - at least, that's how I read RFC 2033.
2981
2982 If all went well, mark the recipient addresses as completed, record which
2983 host/IPaddress they were delivered to, and cut out RSET when sending another
2984 message down the same channel. Write the completed addresses to the journal
2985 now so that they are recorded in case there is a crash of hardware or
2986 software before the spool gets updated. Also record the final SMTP
2987 confirmation if needed (for SMTP only). */
2988
2989 if (sx.ok)
2990 {
2991 int flag = '=';
2992 int delivery_time = (int)(time(NULL) - start_delivery_time);
2993 int len;
2994 uschar *conf = NULL;
2995
2996 sx.send_rset = FALSE;
2997 pipelining_active = FALSE;
2998
2999 /* Set up confirmation if needed - applies only to SMTP */
3000
3001 if (
3002 #ifdef DISABLE_EVENT
3003 LOGGING(smtp_confirmation) &&
3004 #endif
3005 !sx.lmtp
3006 )
3007 {
3008 const uschar *s = string_printing(sx.buffer);
3009 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3010 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3011 }
3012
3013 /* Process all transported addresses - for LMTP or PRDR, read a status for
3014 each one. */
3015
3016 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3017 {
3018 if (addr->transport_return != PENDING_OK) continue;
3019
3020 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3021 remaining addresses. Otherwise, it's a return code for just the one
3022 address. For temporary errors, add a retry item for the address so that
3023 it doesn't get tried again too soon. */
3024
3025 #ifndef DISABLE_PRDR
3026 if (sx.lmtp || sx.prdr_active)
3027 #else
3028 if (sx.lmtp)
3029 #endif
3030 {
3031 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3032 sx.ob->final_timeout))
3033 {
3034 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3035 addr->message = string_sprintf(
3036 #ifndef DISABLE_PRDR
3037 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3038 #else
3039 "LMTP error after %s: %s",
3040 #endif
3041 data_command, string_printing(sx.buffer));
3042 setflag(addr, af_pass_message); /* Allow message to go to user */
3043 if (sx.buffer[0] == '5')
3044 addr->transport_return = FAIL;
3045 else
3046 {
3047 errno = ERRNO_DATA4XX;
3048 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3049 addr->transport_return = DEFER;
3050 #ifndef DISABLE_PRDR
3051 if (!sx.prdr_active)
3052 #endif
3053 retry_add_item(addr, addr->address_retry_key, 0);
3054 }
3055 continue;
3056 }
3057 sx.completed_addr = TRUE; /* NOW we can set this flag */
3058 if (LOGGING(smtp_confirmation))
3059 {
3060 const uschar *s = string_printing(sx.buffer);
3061 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3062 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3063 }
3064 }
3065
3066 /* SMTP, or success return from LMTP for this address. Pass back the
3067 actual host that was used. */
3068
3069 addr->transport_return = OK;
3070 addr->more_errno = delivery_time;
3071 addr->host_used = host;
3072 addr->special_action = flag;
3073 addr->message = conf;
3074 #ifndef DISABLE_PRDR
3075 if (sx.prdr_active) addr->flags |= af_prdr_used;
3076 #endif
3077 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3078 flag = '-';
3079
3080 #ifndef DISABLE_PRDR
3081 if (!sx.prdr_active)
3082 #endif
3083 {
3084 /* Update the journal. For homonymic addresses, use the base address plus
3085 the transport name. See lots of comments in deliver.c about the reasons
3086 for the complications when homonyms are involved. Just carry on after
3087 write error, as it may prove possible to update the spool file later. */
3088
3089 if (testflag(addr, af_homonym))
3090 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3091 else
3092 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3093
3094 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3095 len = Ustrlen(CS sx.buffer);
3096 if (write(journal_fd, sx.buffer, len) != len)
3097 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3098 "%s: %s", sx.buffer, strerror(errno));
3099 }
3100 }
3101
3102 #ifndef DISABLE_PRDR
3103 if (sx.prdr_active)
3104 {
3105 /* PRDR - get the final, overall response. For any non-success
3106 upgrade all the address statuses. */
3107 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3108 sx.ob->final_timeout);
3109 if (!sx.ok)
3110 {
3111 if(errno == 0 && sx.buffer[0] == '4')
3112 {
3113 errno = ERRNO_DATA4XX;
3114 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3115 }
3116 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3117 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3118 addr->transport_return = PENDING_OK; /* allow set_errno action */
3119 goto RESPONSE_FAILED;
3120 }
3121
3122 /* Update the journal, or setup retry. */
3123 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3124 if (addr->transport_return == OK)
3125 {
3126 if (testflag(addr, af_homonym))
3127 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3128 else
3129 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3130
3131 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3132 len = Ustrlen(CS sx.buffer);
3133 if (write(journal_fd, sx.buffer, len) != len)
3134 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3135 "%s: %s", sx.buffer, strerror(errno));
3136 }
3137 else if (addr->transport_return == DEFER)
3138 retry_add_item(addr, addr->address_retry_key, -2);
3139 }
3140 #endif
3141
3142 /* Ensure the journal file is pushed out to disk. */
3143
3144 if (EXIMfsync(journal_fd) < 0)
3145 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3146 strerror(errno));
3147 }
3148 }
3149
3150
3151 /* Handle general (not specific to one address) failures here. The value of ok
3152 is used to skip over this code on the falling through case. A timeout causes a
3153 deferral. Other errors may defer or fail according to the response code, and
3154 may set up a special errno value, e.g. after connection chopped, which is
3155 assumed if errno == 0 and there is no text in the buffer. If control reaches
3156 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3157 the problem is not related to this specific message. */
3158
3159 if (!sx.ok)
3160 {
3161 int code, set_rc;
3162 uschar * set_message;
3163
3164 RESPONSE_FAILED:
3165 {
3166 save_errno = errno;
3167 message = NULL;
3168 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3169 sx.buffer, &code, &message, &pass_message);
3170 goto FAILED;
3171 }
3172
3173 SEND_FAILED:
3174 {
3175 save_errno = errno;
3176 code = '4';
3177 message = string_sprintf("send() to %s [%s] failed: %s",
3178 host->name, host->address, message ? message : US strerror(save_errno));
3179 sx.send_quit = FALSE;
3180 goto FAILED;
3181 }
3182
3183 FAILED:
3184 {
3185 BOOL message_error;
3186
3187 sx.ok = FALSE; /* For when reached by GOTO */
3188 set_message = message;
3189
3190 /* We want to handle timeouts after MAIL or "." and loss of connection after
3191 "." specially. They can indicate a problem with the sender address or with
3192 the contents of the message rather than a real error on the connection. These
3193 cases are treated in the same way as a 4xx response. This next bit of code
3194 does the classification. */
3195
3196 switch(save_errno)
3197 {
3198 case 0:
3199 case ERRNO_MAIL4XX:
3200 case ERRNO_DATA4XX:
3201 message_error = TRUE;
3202 break;
3203
3204 case ETIMEDOUT:
3205 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3206 Ustrncmp(smtp_command,"end ",4) == 0;
3207 break;
3208
3209 case ERRNO_SMTPCLOSED:
3210 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3211 break;
3212
3213 default:
3214 message_error = FALSE;
3215 break;
3216 }
3217
3218 /* Handle the cases that are treated as message errors. These are:
3219
3220 (a) negative response or timeout after MAIL
3221 (b) negative response after DATA
3222 (c) negative response or timeout or dropped connection after "."
3223 (d) utf8 support required and not offered
3224
3225 It won't be a negative response or timeout after RCPT, as that is dealt
3226 with separately above. The action in all cases is to set an appropriate
3227 error code for all the addresses, but to leave yield set to OK because the
3228 host itself has not failed. Of course, it might in practice have failed
3229 when we've had a timeout, but if so, we'll discover that at the next
3230 delivery attempt. For a temporary error, set the message_defer flag, and
3231 write to the logs for information if this is not the last host. The error
3232 for the last host will be logged as part of the address's log line. */
3233
3234 if (message_error)
3235 {
3236 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3237
3238 /* If there's an errno, the message contains just the identity of
3239 the host. */
3240
3241 if (code == '5')
3242 set_rc = FAIL;
3243 else /* Anything other than 5 is treated as temporary */
3244 {
3245 set_rc = DEFER;
3246 if (save_errno > 0)
3247 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3248 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3249 msglog_line(host, message);
3250 *message_defer = TRUE;
3251 }
3252 }
3253
3254 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3255 ".", or some other transportation error. We defer all addresses and yield
3256 DEFER, except for the case of failed add_headers expansion, or a transport
3257 filter failure, when the yield should be ERROR, to stop it trying other
3258 hosts. */
3259
3260 else
3261 {
3262 set_rc = DEFER;
3263 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3264 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3265 }
3266 }
3267
3268 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3269 #ifdef EXPERIMENTAL_DSN_INFO
3270 , sx.smtp_greeting, sx.helo_response
3271 #endif
3272 );
3273 }
3274
3275
3276 /* If all has gone well, send_quit will be set TRUE, implying we can end the