projects / exim.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
GnuTLS: Fix client detection of server reject of client cert under TLS1.3
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
49 #ifndef DISABLE_DKIM
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
68 #endif
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
93 #ifdef SUPPORT_TLS
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
96 #endif
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
101 #ifdef SUPPORT_TLS
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
112 #endif
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
118 #endif
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
121 #ifdef SUPPORT_TLS
122 # ifdef SUPPORT_DANE
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
125 # endif
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
129 # endif
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
132 #endif
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
137 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
140 #endif
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
143 #ifndef DISABLE_PRDR
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
146 #endif
147 #ifdef SUPPORT_TLS
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
150 #endif
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
171 #ifdef SUPPORT_SOCKS
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
174 #endif
175 #ifdef SUPPORT_TLS
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 { "tls_sni", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_sni) },
188 { "tls_tempfail_tryclear", opt_bool,
189 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
190 { "tls_try_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
192 { "tls_verify_cert_hostnames", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
194 { "tls_verify_certificates", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
196 { "tls_verify_hosts", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
198 #endif
199 #ifdef SUPPORT_I18N
200 { "utf8_downconvert", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
202 #endif
203 };
204
205 /* Size of the options list. An extern variable has to be used so that its
206 address can appear in the tables drtables.c. */
207
208 int smtp_transport_options_count = nelem(smtp_transport_options);
209
210
211 #ifdef MACRO_PREDEF
212
213 /* Dummy values */
214 smtp_transport_options_block smtp_transport_option_defaults = {0};
215 void smtp_transport_init(transport_instance *tblock) {}
216 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
217 void smtp_transport_closedown(transport_instance *tblock) {}
218
219 #else /*!MACRO_PREDEF*/
220
221
222 /* Default private options block for the smtp transport. */
223
224 smtp_transport_options_block smtp_transport_option_defaults = {
225 .hosts = NULL,
226 .fallback_hosts = NULL,
227 .hostlist = NULL,
228 .fallback_hostlist = NULL,
229 .helo_data = US"$primary_hostname",
230 .interface = NULL,
231 .port = NULL,
232 .protocol = US"smtp",
233 .dscp = NULL,
234 .serialize_hosts = NULL,
235 .hosts_try_auth = NULL,
236 .hosts_require_auth = NULL,
237 .hosts_try_chunking = US"*",
238 #ifdef SUPPORT_DANE
239 .hosts_try_dane = NULL,
240 .hosts_require_dane = NULL,
241 .dane_require_tls_ciphers = NULL,
242 #endif
243 .hosts_try_fastopen = NULL,
244 #ifndef DISABLE_PRDR
245 .hosts_try_prdr = US"*",
246 #endif
247 #ifndef DISABLE_OCSP
248 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
249 .hosts_require_ocsp = NULL,
250 #endif
251 .hosts_require_tls = NULL,
252 .hosts_avoid_tls = NULL,
253 .hosts_verify_avoid_tls = NULL,
254 .hosts_avoid_pipelining = NULL,
255 #ifdef EXPERIMENTAL_PIPE_CONNECT
256 .hosts_pipe_connect = NULL,
257 #endif
258 .hosts_avoid_esmtp = NULL,
259 #ifdef SUPPORT_TLS
260 .hosts_nopass_tls = NULL,
261 .hosts_noproxy_tls = US"*",
262 #endif
263 .command_timeout = 5*60,
264 .connect_timeout = 5*60,
265 .data_timeout = 5*60,
266 .final_timeout = 10*60,
267 .size_addition = 1024,
268 .hosts_max_try = 5,
269 .hosts_max_try_hardlimit = 50,
270 .address_retry_include_sender = TRUE,
271 .allow_localhost = FALSE,
272 .authenticated_sender_force = FALSE,
273 .gethostbyname = FALSE,
274 .dns_qualify_single = TRUE,
275 .dns_search_parents = FALSE,
276 .dnssec = { .request=NULL, .require=NULL },
277 .delay_after_cutoff = TRUE,
278 .hosts_override = FALSE,
279 .hosts_randomize = FALSE,
280 .keepalive = TRUE,
281 .lmtp_ignore_quota = FALSE,
282 .expand_retry_include_ip_address = NULL,
283 .retry_include_ip_address = TRUE,
284 #ifdef SUPPORT_SOCKS
285 .socks_proxy = NULL,
286 #endif
287 #ifdef SUPPORT_TLS
288 .tls_certificate = NULL,
289 .tls_crl = NULL,
290 .tls_privatekey = NULL,
291 .tls_require_ciphers = NULL,
292 .tls_sni = NULL,
293 .tls_verify_certificates = US"system",
294 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
295 .tls_tempfail_tryclear = TRUE,
296 .tls_verify_hosts = NULL,
297 .tls_try_verify_hosts = US"*",
298 .tls_verify_cert_hostnames = US"*",
299 #endif
300 #ifdef SUPPORT_I18N
301 .utf8_downconvert = NULL,
302 #endif
303 #ifndef DISABLE_DKIM
304 .dkim =
305 {.dkim_domain = NULL,
306 .dkim_identity = NULL,
307 .dkim_private_key = NULL,
308 .dkim_selector = NULL,
309 .dkim_canon = NULL,
310 .dkim_sign_headers = NULL,
311 .dkim_strict = NULL,
312 .dkim_hash = US"sha256",
313 .dkim_timestamps = NULL,
314 .dot_stuffed = FALSE,
315 .force_bodyhash = FALSE,
316 # ifdef EXPERIMENTAL_ARC
317 .arc_signspec = NULL,
318 # endif
319 },
320 # ifdef EXPERIMENTAL_ARC
321 .arc_sign = NULL,
322 # endif
323 #endif
324 };
325
326 /* some DSN flags for use later */
327
328 static int rf_list[] = {rf_notify_never, rf_notify_success,
329 rf_notify_failure, rf_notify_delay };
330
331 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
332
333
334
335 /* Local statics */
336
337 static uschar *smtp_command; /* Points to last cmd for error messages */
338 static uschar *mail_command; /* Points to MAIL cmd for error messages */
339 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
340 static BOOL update_waiting; /* TRUE to update the "wait" database */
341
342 /*XXX move to smtp_context */
343 static BOOL pipelining_active; /* current transaction is in pipe mode */
344
345
346 static unsigned ehlo_response(uschar * buf, unsigned checks);
347
348
349 /*************************************************
350 * Setup entry point *
351 *************************************************/
352
353 /* This function is called when the transport is about to be used,
354 but before running it in a sub-process. It is used for two things:
355
356 (1) To set the fallback host list in addresses, when delivering.
357 (2) To pass back the interface, port, protocol, and other options, for use
358 during callout verification.
359
360 Arguments:
361 tblock pointer to the transport instance block
362 addrlist list of addresses about to be transported
363 tf if not NULL, pointer to block in which to return options
364 uid the uid that will be set (not used)
365 gid the gid that will be set (not used)
366 errmsg place for error message (not used)
367
368 Returns: OK always (FAIL, DEFER not used)
369 */
370
371 static int
372 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
373 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
374 {
375 smtp_transport_options_block *ob = SOB tblock->options_block;
376
377 errmsg = errmsg; /* Keep picky compilers happy */
378 uid = uid;
379 gid = gid;
380
381 /* Pass back options if required. This interface is getting very messy. */
382
383 if (tf)
384 {
385 tf->interface = ob->interface;
386 tf->port = ob->port;
387 tf->protocol = ob->protocol;
388 tf->hosts = ob->hosts;
389 tf->hosts_override = ob->hosts_override;
390 tf->hosts_randomize = ob->hosts_randomize;
391 tf->gethostbyname = ob->gethostbyname;
392 tf->qualify_single = ob->dns_qualify_single;
393 tf->search_parents = ob->dns_search_parents;
394 tf->helo_data = ob->helo_data;
395 }
396
397 /* Set the fallback host list for all the addresses that don't have fallback
398 host lists, provided that the local host wasn't present in the original host
399 list. */
400
401 if (!testflag(addrlist, af_local_host_removed))
402 for (; addrlist; addrlist = addrlist->next)
403 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
404
405 return OK;
406 }
407
408
409
410 /*************************************************
411 * Initialization entry point *
412 *************************************************/
413
414 /* Called for each instance, after its options have been read, to
415 enable consistency checks to be done, or anything else that needs
416 to be set up.
417
418 Argument: pointer to the transport instance block
419 Returns: nothing
420 */
421
422 void
423 smtp_transport_init(transport_instance *tblock)
424 {
425 smtp_transport_options_block *ob = SOB tblock->options_block;
426
427 /* Retry_use_local_part defaults FALSE if unset */
428
429 if (tblock->retry_use_local_part == TRUE_UNSET)
430 tblock->retry_use_local_part = FALSE;
431
432 /* Set the default port according to the protocol */
433
434 if (!ob->port)
435 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
436 ? US"lmtp"
437 : strcmpic(ob->protocol, US"smtps") == 0
438 ? US"smtps" : US"smtp";
439
440 /* Set up the setup entry point, to be called before subprocesses for this
441 transport. */
442
443 tblock->setup = smtp_transport_setup;
444
445 /* Complain if any of the timeouts are zero. */
446
447 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
448 ob->final_timeout <= 0)
449 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
450 "command, data, or final timeout value is zero for %s transport",
451 tblock->name);
452
453 /* If hosts_override is set and there are local hosts, set the global
454 flag that stops verify from showing router hosts. */
455
456 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
457
458 /* If there are any fallback hosts listed, build a chain of host items
459 for them, but do not do any lookups at this time. */
460
461 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
462 }
463
464
465
466
467
468 /*************************************************
469 * Set delivery info into all active addresses *
470 *************************************************/
471
472 /* Only addresses whose status is >= PENDING are relevant. A lesser
473 status means that an address is not currently being processed.
474
475 Arguments:
476 addrlist points to a chain of addresses
477 errno_value to put in each address's errno field
478 msg to put in each address's message field
479 rc to put in each address's transport_return field
480 pass_message if TRUE, set the "pass message" flag in the address
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
484
485 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
486 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
487 this particular type of timeout.
488
489 Returns: nothing
490 */
491
492 static void
493 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
494 BOOL pass_message, host_item * host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar * smtp_greeting, const uschar * helo_response
497 #endif
498 )
499 {
500 int orvalue = 0;
501 if (errno_value == ERRNO_CONNECTTIMEOUT)
502 {
503 errno_value = ETIMEDOUT;
504 orvalue = RTEF_CTOUT;
505 }
506 for (address_item * addr = addrlist; addr; addr = addr->next)
507 if (addr->transport_return >= PENDING)
508 {
509 addr->basic_errno = errno_value;
510 addr->more_errno |= orvalue;
511 if (msg)
512 {
513 addr->message = msg;
514 if (pass_message) setflag(addr, af_pass_message);
515 }
516 addr->transport_return = rc;
517 if (host)
518 {
519 addr->host_used = host;
520 #ifdef EXPERIMENTAL_DSN_INFO
521 if (smtp_greeting)
522 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
523 addr->smtp_greeting = smtp_greeting;
524
525 if (helo_response)
526 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
527 addr->helo_response = helo_response;
528 #endif
529 }
530 }
531 }
532
533 static void
534 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
535 BOOL pass_message)
536 {
537 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
538 #ifdef EXPERIMENTAL_DSN_INFO
539 , NULL, NULL
540 #endif
541 );
542 }
543
544
545 /*************************************************
546 * Check an SMTP response *
547 *************************************************/
548
549 /* This function is given an errno code and the SMTP response buffer
550 to analyse, together with the host identification for generating messages. It
551 sets an appropriate message and puts the first digit of the response code into
552 the yield variable. If no response was actually read, a suitable digit is
553 chosen.
554
555 Arguments:
556 host the current host, to get its name for messages
557 errno_value pointer to the errno value
558 more_errno from the top address for use with ERRNO_FILTER_FAIL
559 buffer the SMTP response buffer
560 yield where to put a one-digit SMTP response code
561 message where to put an error message
562 pass_message set TRUE if message is an SMTP response
563
564 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
565 */
566
567 static BOOL
568 check_response(host_item *host, int *errno_value, int more_errno,
569 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
570 {
571 uschar * pl = pipelining_active ? US"pipelined " : US"";
572 const uschar * s;
573
574 *yield = '4'; /* Default setting is to give a temporary error */
575
576 switch(*errno_value)
577 {
578 case ETIMEDOUT: /* Handle response timeout */
579 *message = US string_sprintf("SMTP timeout after %s%s",
580 pl, smtp_command);
581 if (transport_count > 0)
582 *message = US string_sprintf("%s (%d bytes written)", *message,
583 transport_count);
584 return FALSE;
585
586 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
587 s = string_printing(buffer);
588 while (isspace(*s)) s++;
589 *message = *s == 0
590 ? string_sprintf("Malformed SMTP reply (an empty line) "
591 "in response to %s%s", pl, smtp_command)
592 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
593 pl, smtp_command, s);
594 return FALSE;
595
596 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
597 GnuTLS and TLS1.3 */
598 *message = US"bad first read from TLS conn";
599 return TRUE;
600
601 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
602 can't send QUIT as we mustn't end the DATA. */
603 *message = string_sprintf("transport filter process failed (%d)%s",
604 more_errno,
605 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
606 return FALSE;
607
608 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
609 can't send QUIT as we mustn't end the DATA. */
610 *message =
611 string_sprintf("failed to expand headers_add or headers_remove: %s",
612 expand_string_message);
613 return FALSE;
614
615 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
616 *message = string_sprintf("failed to write a data block");
617 return FALSE;
618
619 #ifdef SUPPORT_I18N
620 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
621 *message = US"utf8 support required but not offered for forwarding";
622 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
623 return TRUE;
624 #endif
625 }
626
627 /* Handle error responses from the remote mailer. */
628
629 if (buffer[0] != 0)
630 {
631 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
632 "%s", pl, smtp_command, s = string_printing(buffer));
633 *pass_message = TRUE;
634 *yield = buffer[0];
635 return TRUE;
636 }
637
638 /* No data was read. If there is no errno, this must be the EOF (i.e.
639 connection closed) case, which causes deferral. An explicit connection reset
640 error has the same effect. Otherwise, put the host's identity in the message,
641 leaving the errno value to be interpreted as well. In all cases, we have to
642 assume the connection is now dead. */
643
644 if (*errno_value == 0 || *errno_value == ECONNRESET)
645 {
646 *errno_value = ERRNO_SMTPCLOSED;
647 *message = US string_sprintf("Remote host closed connection "
648 "in response to %s%s", pl, smtp_command);
649 }
650 else
651 *message = US string_sprintf("%s [%s]", host->name, host->address);
652
653 return FALSE;
654 }
655
656
657
658 /*************************************************
659 * Write error message to logs *
660 *************************************************/
661
662 /* This writes to the main log and to the message log.
663
664 Arguments:
665 host the current host
666 detail the current message (addr_item->message)
667 basic_errno the errno (addr_item->basic_errno)
668
669 Returns: nothing
670 */
671
672 static void
673 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
674 {
675 gstring * message = LOGGING(outgoing_port)
676 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
677 host->port == PORT_NONE ? 25 : host->port)
678 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
679
680 if (suffix)
681 {
682 message = string_fmt_append(message, ": %s", suffix);
683 if (basic_errno > 0)
684 message = string_fmt_append(message, ": %s", strerror(basic_errno));
685 }
686 else
687 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
688
689 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
690 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
691 }
692
693 static void
694 msglog_line(host_item * host, uschar * message)
695 {
696 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
697 host->name, host->address, message);
698 }
699
700
701
702 #ifndef DISABLE_EVENT
703 /*************************************************
704 * Post-defer action *
705 *************************************************/
706
707 /* This expands an arbitrary per-transport string.
708 It might, for example, be used to write to the database log.
709
710 Arguments:
711 addr the address item containing error information
712 host the current host
713
714 Returns: nothing
715 */
716
717 static void
718 deferred_event_raise(address_item *addr, host_item *host)
719 {
720 uschar * action = addr->transport->event_action;
721 const uschar * save_domain;
722 uschar * save_local;
723
724 if (!action)
725 return;
726
727 save_domain = deliver_domain;
728 save_local = deliver_localpart;
729
730 /*XXX would ip & port already be set up? */
731 deliver_host_address = string_copy(host->address);
732 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
733 event_defer_errno = addr->basic_errno;
734
735 router_name = addr->router->name;
736 transport_name = addr->transport->name;
737 deliver_domain = addr->domain;
738 deliver_localpart = addr->local_part;
739
740 (void) event_raise(action, US"msg:host:defer",
741 addr->message
742 ? addr->basic_errno > 0
743 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
744 : string_copy(addr->message)
745 : addr->basic_errno > 0
746 ? string_copy(US strerror(addr->basic_errno))
747 : NULL);
748
749 deliver_localpart = save_local;
750 deliver_domain = save_domain;
751 router_name = transport_name = NULL;
752 }
753 #endif
754
755 /*************************************************
756 * Reap SMTP specific responses *
757 *************************************************/
758 static int
759 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
760 int count)
761 {
762 uschar flushbuffer[4096];
763
764 while (count-- > 0)
765 {
766 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
767 '2', ob->command_timeout)
768 && (errno != 0 || flushbuffer[0] == 0))
769 break;
770 }
771 return count;
772 }
773
774
775 /* Return boolean success */
776
777 static BOOL
778 smtp_reap_banner(smtp_context * sx)
779 {
780 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
781 '2', (SOB sx->conn_args.ob)->command_timeout);
782 #ifdef EXPERIMENTAL_DSN_INFO
783 sx->smtp_greeting = string_copy(sx->buffer);
784 #endif
785 return good_response;
786 }
787
788 static BOOL
789 smtp_reap_ehlo(smtp_context * sx)
790 {
791 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
792 (SOB sx->conn_args.ob)->command_timeout))
793 {
794 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
795 {
796 #ifdef EXPERIMENTAL_DSN_INFO
797 sx->helo_response = string_copy(sx->buffer);
798 #endif
799 return FALSE;
800 }
801 sx->esmtp = FALSE;
802 }
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
805 #endif
806 return TRUE;
807 }
808
809
810
811 #ifdef EXPERIMENTAL_PIPE_CONNECT
812 static uschar *
813 ehlo_cache_key(const smtp_context * sx)
814 {
815 host_item * host = sx->conn_args.host;
816 return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
821 }
822
823 static void
824 write_ehlo_cache_entry(const smtp_context * sx)
825 {
826 open_db dbblock, * dbm_file;
827
828 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
829 {
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
832
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
836
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
839 }
840 }
841
842 static void
843 invalidate_ehlo_cache_entry(smtp_context * sx)
844 {
845 open_db dbblock, * dbm_file;
846
847 if ( sx->early_pipe_active
848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
849 {
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
853 }
854 }
855
856 static BOOL
857 read_ehlo_cache_entry(smtp_context * sx)
858 {
859 open_db dbblock;
860 open_db * dbm_file;
861
862 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
864 else
865 {
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
868
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
872 {
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
876 dbfn_delete(dbm_file, ehlo_resp_key);
877 }
878 else
879 {
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
883 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
884 er->data.cleartext_features, er->data.crypted_features);
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889 return FALSE;
890 }
891
892
893
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
896
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
899 {
900 uschar * names;
901 auth_instance * au;
902 uschar authnum;
903 unsigned short authbits = 0;
904
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922 DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928 else
929 sx->ehlo_resp.cleartext_auths = authbits;
930 return authbits;
931 }
932
933
934
935
936 /* Wait for and check responses for early-pipelining.
937
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
942
943 Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947 Return:
948 OK all well
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
951 */
952 int
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 {
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
957 int rc = FAIL;
958
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
961
962 if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
970 goto fail;
971 }
972 }
973
974 if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017 return OK;
1018
1019 fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1022 return rc;
1023 }
1024 #endif
1025
1026
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1030
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1036 of code.
1037
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1042
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1051
1052 Arguments:
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1058
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1068 */
1069
1070 static int
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 {
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1075 int yield = 0;
1076 int rc;
1077
1078 #ifdef EXPERIMENTAL_PIPE_CONNECT
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1081 #endif
1082
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1086
1087 if (sx->pending_MAIL)
1088 {
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 count--;
1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1092 '2', ob->command_timeout))
1093 {
1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1096 if (errno == ERRNO_TLSFAILURE)
1097 return -5;
1098 if (errno == 0 && sx->buffer[0] != 0)
1099 {
1100 int save_errno = 0;
1101 if (sx->buffer[0] == '4')
1102 {
1103 save_errno = ERRNO_MAIL4XX;
1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1105 }
1106 count = smtp_discard_responses(sx, ob, count);
1107 errno = save_errno;
1108 }
1109
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1112 {
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1114 addr->host_used = sx->conn_args.host;
1115 addr = addr->next;
1116 }
1117 return -3;
1118 }
1119 }
1120
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1122
1123 /* Read and handle the required number of RCPT responses, matching each one up
1124 with an address by scanning for the next address whose status is PENDING_DEFER.
1125 */
1126
1127 while (count-- > 0)
1128 {
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1131 return -2;
1132
1133 /* The address was accepted */
1134 addr->host_used = sx->conn_args.host;
1135
1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1138 '2', ob->command_timeout))
1139 {
1140 yield |= 1;
1141 addr->transport_return = PENDING_OK;
1142
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
1146
1147 if (testflag(addr, af_dr_retry_exists))
1148 {
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1150 sender_address);
1151 retry_add_item(addr, altkey, rf_delete);
1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
1153 }
1154 }
1155
1156 /* Error on first TLS read */
1157
1158 else if (errno == ERRNO_TLSFAILURE)
1159 return -5;
1160
1161 /* Timeout while reading the response */
1162
1163 else if (errno == ETIMEDOUT)
1164 {
1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1168 retry_add_item(addr, addr->address_retry_key, 0);
1169 update_waiting = FALSE;
1170 return -1;
1171 }
1172
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1176 makes sense. */
1177
1178 else if (errno != 0 || sx->buffer[0] == 0)
1179 {
1180 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1181 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1182 return -2;
1183 }
1184
1185 /* Handle SMTP permanent and temporary response codes. */
1186
1187 else
1188 {
1189 addr->message =
1190 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1191 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1192 string_printing(sx->buffer));
1193 setflag(addr, af_pass_message);
1194 if (!sx->verify)
1195 msglog_line(sx->conn_args.host, addr->message);
1196
1197 /* The response was 5xx */
1198
1199 if (sx->buffer[0] == '5')
1200 {
1201 addr->transport_return = FAIL;
1202 yield |= 2;
1203 }
1204
1205 /* The response was 4xx */
1206
1207 else
1208 {
1209 addr->transport_return = DEFER;
1210 addr->basic_errno = ERRNO_RCPT4XX;
1211 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1212
1213 if (!sx->verify)
1214 {
1215 #ifndef DISABLE_EVENT
1216 event_defer_errno = addr->more_errno;
1217 msg_event_raise(US"msg:rcpt:host:defer", addr);
1218 #endif
1219
1220 /* Log temporary errors if there are more hosts to be tried.
1221 If not, log this last one in the == line. */
1222
1223 if (sx->conn_args.host->next)
1224 if (LOGGING(outgoing_port))
1225 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1226 sx->conn_args.host->address,
1227 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1228 else
1229 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1230 sx->conn_args.host->address, addr->message);
1231
1232 #ifndef DISABLE_EVENT
1233 else
1234 msg_event_raise(US"msg:rcpt:defer", addr);
1235 #endif
1236
1237 /* Do not put this message on the list of those waiting for specific
1238 hosts, as otherwise it is likely to be tried too often. */
1239
1240 update_waiting = FALSE;
1241
1242 /* Add a retry item for the address so that it doesn't get tried again
1243 too soon. If address_retry_include_sender is true, add the sender address
1244 to the retry key. */
1245
1246 retry_add_item(addr,
1247 ob->address_retry_include_sender
1248 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1249 : addr->address_retry_key,
1250 0);
1251 }
1252 }
1253 }
1254 } /* Loop for next RCPT response */
1255
1256 /* Update where to start at for the next block of responses, unless we
1257 have already handled all the addresses. */
1258
1259 if (addr) sx->sync_addr = addr->next;
1260
1261 /* Handle a response to DATA. If we have not had any good recipients, either
1262 previously or in this block, the response is ignored. */
1263
1264 if (pending_DATA != 0)
1265 {
1266 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1267 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1268 '3', ob->command_timeout))
1269 {
1270 int code;
1271 uschar *msg;
1272 BOOL pass_message;
1273
1274 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1275 return -5;
1276
1277 if (pending_DATA > 0 || (yield & 1) != 0)
1278 {
1279 if (errno == 0 && sx->buffer[0] == '4')
1280 {
1281 errno = ERRNO_DATA4XX;
1282 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1283 }
1284 return -3;
1285 }
1286 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1287 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1288 "is in use and there were no good recipients\n", msg);
1289 }
1290 }
1291
1292 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1293 present) received 3xx. If any RCPTs were handled and yielded anything other
1294 than 4xx, yield will be set non-zero. */
1295
1296 return yield;
1297 }
1298
1299
1300
1301
1302
1303 /* Try an authenticator's client entry */
1304
1305 static int
1306 try_authenticator(smtp_context * sx, auth_instance * au)
1307 {
1308 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1309 host_item * host = sx->conn_args.host; /* host to deliver to */
1310 int rc;
1311
1312 sx->outblock.authenticating = TRUE;
1313 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1314 sx->buffer, sizeof(sx->buffer));
1315 sx->outblock.authenticating = FALSE;
1316 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1317
1318 /* A temporary authentication failure must hold up delivery to
1319 this host. After a permanent authentication failure, we carry on
1320 to try other authentication methods. If all fail hard, try to
1321 deliver the message unauthenticated unless require_auth was set. */
1322
1323 switch(rc)
1324 {
1325 case OK:
1326 f.smtp_authenticated = TRUE; /* stops the outer loop */
1327 client_authenticator = au->name;
1328 if (au->set_client_id)
1329 client_authenticated_id = expand_string(au->set_client_id);
1330 break;
1331
1332 /* Failure after writing a command */
1333
1334 case FAIL_SEND:
1335 return FAIL_SEND;
1336
1337 /* Failure after reading a response */
1338
1339 case FAIL:
1340 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1341 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1342 au->name, host->name, host->address, sx->buffer);
1343 break;
1344
1345 /* Failure by some other means. In effect, the authenticator
1346 decided it wasn't prepared to handle this case. Typically this
1347 is the result of "fail" in an expansion string. Do we need to
1348 log anything here? Feb 2006: a message is now put in the buffer
1349 if logging is required. */
1350
1351 case CANCELLED:
1352 if (*sx->buffer != 0)
1353 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1354 "authentication H=%s [%s] %s", au->name, host->name,
1355 host->address, sx->buffer);
1356 break;
1357
1358 /* Internal problem, message in buffer. */
1359
1360 case ERROR:
1361 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1362 DEFER, FALSE);
1363 return ERROR;
1364 }
1365 return OK;
1366 }
1367
1368
1369
1370
1371 /* Do the client side of smtp-level authentication.
1372
1373 Arguments:
1374 sx smtp connection context
1375
1376 sx->buffer should have the EHLO response from server (gets overwritten)
1377
1378 Returns:
1379 OK Success, or failed (but not required): global "smtp_authenticated" set
1380 DEFER Failed authentication (and was required)
1381 ERROR Internal problem
1382
1383 FAIL_SEND Failed communications - transmit
1384 FAIL - response
1385 */
1386
1387 static int
1388 smtp_auth(smtp_context * sx)
1389 {
1390 host_item * host = sx->conn_args.host; /* host to deliver to */
1391 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1392 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1393 #ifdef EXPERIMENTAL_PIPE_CONNECT
1394 unsigned short authbits = tls_out.active.sock >= 0
1395 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1396 #endif
1397 uschar * fail_reason = US"server did not advertise AUTH support";
1398
1399 f.smtp_authenticated = FALSE;
1400 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1401
1402 if (!regex_AUTH)
1403 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1404
1405 /* Is the server offering AUTH? */
1406
1407 if ( sx->esmtp
1408 &&
1409 #ifdef EXPERIMENTAL_PIPE_CONNECT
1410 sx->early_pipe_active ? authbits
1411 :
1412 #endif
1413 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1414 )
1415 {
1416 uschar * names = NULL;
1417 expand_nmax = -1; /* reset */
1418
1419 #ifdef EXPERIMENTAL_PIPE_CONNECT
1420 if (!sx->early_pipe_active)
1421 #endif
1422 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1423
1424 /* Must not do this check until after we have saved the result of the
1425 regex match above as the check could be another RE. */
1426
1427 if ( require_auth == OK
1428 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1429 {
1430 auth_instance * au;
1431
1432 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1433 fail_reason = US"no common mechanisms were found";
1434
1435 #ifdef EXPERIMENTAL_PIPE_CONNECT
1436 if (sx->early_pipe_active)
1437 {
1438 /* Scan our authenticators (which support use by a client and were offered
1439 by the server (checked at cache-write time)), not suppressed by
1440 client_condition. If one is found, attempt to authenticate by calling its
1441 client function. We are limited to supporting up to 16 authenticator
1442 public-names by the number of bits in a short. */
1443
1444 uschar bitnum;
1445 int rc;
1446
1447 for (bitnum = 0, au = auths;
1448 !f.smtp_authenticated && au && bitnum < 16;
1449 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1450 {
1451 if ( au->client_condition
1452 && !expand_check_condition(au->client_condition, au->name,
1453 US"client authenticator"))
1454 {
1455 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1456 au->name, "client_condition is false");
1457 continue;
1458 }
1459
1460 /* Found data for a listed mechanism. Call its client entry. Set
1461 a flag in the outblock so that data is overwritten after sending so
1462 that reflections don't show it. */
1463
1464 fail_reason = US"authentication attempt(s) failed";
1465
1466 if ((rc = try_authenticator(sx, au)) != OK)
1467 return rc;
1468 }
1469 }
1470 else
1471 #endif
1472
1473 /* Scan the configured authenticators looking for one which is configured
1474 for use as a client, which is not suppressed by client_condition, and
1475 whose name matches an authentication mechanism supported by the server.
1476 If one is found, attempt to authenticate by calling its client function.
1477 */
1478
1479 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1480 {
1481 uschar *p = names;
1482
1483 if ( !au->client
1484 || ( au->client_condition
1485 && !expand_check_condition(au->client_condition, au->name,
1486 US"client authenticator")))
1487 {
1488 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1489 au->name,
1490 (au->client)? "client_condition is false" :
1491 "not configured as a client");
1492 continue;
1493 }
1494
1495 /* Loop to scan supported server mechanisms */
1496
1497 while (*p)
1498 {
1499 int len = Ustrlen(au->public_name);
1500 int rc;
1501
1502 while (isspace(*p)) p++;
1503
1504 if (strncmpic(au->public_name, p, len) != 0 ||
1505 (p[len] != 0 && !isspace(p[len])))
1506 {
1507 while (*p != 0 && !isspace(*p)) p++;
1508 continue;
1509 }
1510
1511 /* Found data for a listed mechanism. Call its client entry. Set
1512 a flag in the outblock so that data is overwritten after sending so
1513 that reflections don't show it. */
1514
1515 fail_reason = US"authentication attempt(s) failed";
1516
1517 if ((rc = try_authenticator(sx, au)) != OK)
1518 return rc;
1519
1520 break; /* If not authenticated, try next authenticator */
1521 } /* Loop for scanning supported server mechanisms */
1522 } /* Loop for further authenticators */
1523 }
1524 }
1525
1526 /* If we haven't authenticated, but are required to, give up. */
1527
1528 if (require_auth == OK && !f.smtp_authenticated)
1529 {
1530 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1531 string_sprintf("authentication required but %s", fail_reason), DEFER,
1532 FALSE);
1533 return DEFER;
1534 }
1535
1536 return OK;
1537 }
1538
1539
1540 /* Construct AUTH appendix string for MAIL TO */
1541 /*
1542 Arguments
1543 buffer to build string
1544 addrlist chain of potential addresses to deliver
1545 ob transport options
1546
1547 Globals f.smtp_authenticated
1548 client_authenticated_sender
1549 Return True on error, otherwise buffer has (possibly empty) terminated string
1550 */
1551
1552 BOOL
1553 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1554 smtp_transport_options_block *ob)
1555 {
1556 uschar *local_authenticated_sender = authenticated_sender;
1557
1558 #ifdef notdef
1559 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1560 #endif
1561
1562 if (ob->authenticated_sender != NULL)
1563 {
1564 uschar *new = expand_string(ob->authenticated_sender);
1565 if (new == NULL)
1566 {
1567 if (!f.expand_string_forcedfail)
1568 {
1569 uschar *message = string_sprintf("failed to expand "
1570 "authenticated_sender: %s", expand_string_message);
1571 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1572 return TRUE;
1573 }
1574 }
1575 else if (new[0] != 0) local_authenticated_sender = new;
1576 }
1577
1578 /* Add the authenticated sender address if present */
1579
1580 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1581 local_authenticated_sender != NULL)
1582 {
1583 string_format(buffer, bufsize, " AUTH=%s",
1584 auth_xtextencode(local_authenticated_sender,
1585 Ustrlen(local_authenticated_sender)));
1586 client_authenticated_sender = string_copy(local_authenticated_sender);
1587 }
1588 else
1589 *buffer= 0;
1590
1591 return FALSE;
1592 }
1593
1594
1595
1596 #ifdef SUPPORT_DANE
1597 /* Lookup TLSA record for host/port.
1598 Return: OK success with dnssec; DANE mode
1599 DEFER Do not use this host now, may retry later
1600 FAIL_FORCED No TLSA record; DANE not usable
1601 FAIL Do not use this connection
1602 */
1603
1604 int
1605 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1606 {
1607 /* move this out to host.c given the similarity to dns_lookup() ? */
1608 uschar buffer[300];
1609 const uschar * fullname = buffer;
1610 int rc;
1611 BOOL sec;
1612
1613 /* TLSA lookup string */
1614 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1615
1616 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1617 sec = dns_is_secure(dnsa);
1618 DEBUG(D_transport)
1619 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1620
1621 switch (rc)
1622 {
1623 case DNS_AGAIN:
1624 return DEFER; /* just defer this TLS'd conn */
1625
1626 case DNS_SUCCEED:
1627 if (sec)
1628 {
1629 DEBUG(D_transport)
1630 {
1631 dns_scan dnss;
1632 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1633 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1634 if (rr->type == T_TLSA && rr->size > 3)
1635 {
1636 uint16_t payload_length = rr->size - 3;
1637 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1638
1639 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1640 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1641 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1642 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1643 sp += sprintf(CS sp, "%02x", *p++);
1644
1645 debug_printf(" %s\n", s);
1646 }
1647 }
1648 return OK;
1649 }
1650 log_write(0, LOG_MAIN,
1651 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1652 /*FALLTRHOUGH*/
1653
1654 case DNS_NODATA: /* no TLSA RR for this lookup */
1655 case DNS_NOMATCH: /* no records at all for this lookup */
1656 return dane_required ? FAIL : FAIL_FORCED;
1657
1658 default:
1659 case DNS_FAIL:
1660 return dane_required ? FAIL : DEFER;
1661 }
1662 }
1663 #endif
1664
1665
1666
1667 typedef struct smtp_compare_s
1668 {
1669 uschar *current_sender_address;
1670 struct transport_instance *tblock;
1671 } smtp_compare_t;
1672
1673
1674 /* Create a unique string that identifies this message, it is based on
1675 sender_address, helo_data and tls_certificate if enabled.
1676 */
1677
1678 static uschar *
1679 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1680 {
1681 address_item * addr1;
1682 uschar * if1 = US"";
1683 uschar * helo1 = US"";
1684 #ifdef SUPPORT_TLS
1685 uschar * tlsc1 = US"";
1686 #endif
1687 uschar * save_sender_address = sender_address;
1688 uschar * local_identity = NULL;
1689 smtp_transport_options_block * ob = SOB tblock->options_block;
1690
1691 sender_address = sender;
1692
1693 addr1 = deliver_make_addr (sender, TRUE);
1694 deliver_set_expansions(addr1);
1695
1696 if (ob->interface)
1697 if1 = expand_string(ob->interface);
1698
1699 if (ob->helo_data)
1700 helo1 = expand_string(ob->helo_data);
1701
1702 #ifdef SUPPORT_TLS
1703 if (ob->tls_certificate)
1704 tlsc1 = expand_string(ob->tls_certificate);
1705 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1706 #else
1707 local_identity = string_sprintf ("%s^%s", if1, helo1);
1708 #endif
1709
1710 deliver_set_expansions(NULL);
1711 sender_address = save_sender_address;
1712
1713 return local_identity;
1714 }
1715
1716
1717
1718 /* This routine is a callback that is called from transport_check_waiting.
1719 This function will evaluate the incoming message versus the previous
1720 message. If the incoming message is using a different local identity then
1721 we will veto this new message. */
1722
1723 static BOOL
1724 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1725 {
1726 uschar * message_local_identity,
1727 * current_local_identity,
1728 * new_sender_address;
1729
1730 current_local_identity =
1731 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1732
1733 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1734 return 0;
1735
1736 message_local_identity =
1737 smtp_local_identity(new_sender_address, s_compare->tblock);
1738
1739 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1740 }
1741
1742
1743
1744 static unsigned
1745 ehlo_response(uschar * buf, unsigned checks)
1746 {
1747 size_t bsize = Ustrlen(buf);
1748
1749 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1750
1751 #ifdef SUPPORT_TLS
1752 # ifdef EXPERIMENTAL_REQUIRETLS
1753 if ( checks & OPTION_REQUIRETLS
1754 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1755 # endif
1756 checks &= ~OPTION_REQUIRETLS;
1757
1758 if ( checks & OPTION_TLS
1759 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1760 #endif
1761 checks &= ~OPTION_TLS;
1762
1763 if ( checks & OPTION_IGNQ
1764 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1765 PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_IGNQ;
1767
1768 if ( checks & OPTION_CHUNKING
1769 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1770 checks &= ~OPTION_CHUNKING;
1771
1772 #ifndef DISABLE_PRDR
1773 if ( checks & OPTION_PRDR
1774 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1775 #endif
1776 checks &= ~OPTION_PRDR;
1777
1778 #ifdef SUPPORT_I18N
1779 if ( checks & OPTION_UTF8
1780 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1781 #endif
1782 checks &= ~OPTION_UTF8;
1783
1784 if ( checks & OPTION_DSN
1785 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1786 checks &= ~OPTION_DSN;
1787
1788 if ( checks & OPTION_PIPE
1789 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1790 PCRE_EOPT, NULL, 0) < 0)
1791 checks &= ~OPTION_PIPE;
1792
1793 if ( checks & OPTION_SIZE
1794 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1795 checks &= ~OPTION_SIZE;
1796
1797 #ifdef EXPERIMENTAL_PIPE_CONNECT
1798 if ( checks & OPTION_EARLY_PIPE
1799 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1800 PCRE_EOPT, NULL, 0) < 0)
1801 #endif
1802 checks &= ~OPTION_EARLY_PIPE;
1803
1804 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1805 return checks;
1806 }
1807
1808
1809
1810 /* Callback for emitting a BDAT data chunk header.
1811
1812 If given a nonzero size, first flush any buffered SMTP commands
1813 then emit the command.
1814
1815 Reap previous SMTP command responses if requested, and always reap
1816 the response from a previous BDAT command.
1817
1818 Args:
1819 tctx transport context
1820 chunk_size value for SMTP BDAT command
1821 flags
1822 tc_chunk_last add LAST option to SMTP BDAT command
1823 tc_reap_prev reap response to previous SMTP commands
1824
1825 Returns:
1826 OK or ERROR
1827 DEFER TLS error on first read (EHLO-resp); errno set
1828 */
1829
1830 static int
1831 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1832 unsigned flags)
1833 {
1834 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1835 smtp_context * sx = tctx->smtp_context;
1836 int cmd_count = 0;
1837 int prev_cmd_count;
1838
1839 /* Write SMTP chunk header command. If not reaping responses, note that
1840 there may be more writes (like, the chunk data) done soon. */
1841
1842 if (chunk_size > 0)
1843 {
1844 #ifdef EXPERIMENTAL_PIPE_CONNECT
1845 BOOL new_conn = !!(sx->outblock.conn_args);
1846 #endif
1847 if((cmd_count = smtp_write_command(sx,
1848 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1849 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1850 ) < 0) return ERROR;
1851 if (flags & tc_chunk_last)
1852 data_command = string_copy(big_buffer); /* Save for later error message */
1853 #ifdef EXPERIMENTAL_PIPE_CONNECT
1854 /* That command write could have been the one that made the connection.
1855 Copy the fd from the client conn ctx (smtp transport specific) to the
1856 generic transport ctx. */
1857
1858 if (new_conn)
1859 tctx->u.fd = sx->outblock.cctx->sock;
1860 #endif
1861 }
1862
1863 prev_cmd_count = cmd_count += sx->cmd_count;
1864
1865 /* Reap responses for any previous, but not one we just emitted */
1866
1867 if (chunk_size > 0)
1868 prev_cmd_count--;
1869 if (sx->pending_BDAT)
1870 prev_cmd_count--;
1871
1872 if (flags & tc_reap_prev && prev_cmd_count > 0)
1873 {
1874 DEBUG(D_transport) debug_printf("look for %d responses"
1875 " for previous pipelined cmds\n", prev_cmd_count);
1876
1877 switch(sync_responses(sx, prev_cmd_count, 0))
1878 {
1879 case 1: /* 2xx (only) => OK */
1880 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1881 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1882 case 0: break; /* No 2xx or 5xx, but no probs */
1883
1884 case -5: errno = ERRNO_TLSFAILURE;
1885 return DEFER;
1886 #ifdef EXPERIMENTAL_PIPE_CONNECT
1887 case -4: /* non-2xx for pipelined banner or EHLO */
1888 #endif
1889 case -1: /* Timeout on RCPT */
1890 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1891 }
1892 cmd_count = 1;
1893 if (!sx->pending_BDAT)
1894 pipelining_active = FALSE;
1895 }
1896
1897 /* Reap response for an outstanding BDAT */
1898
1899 if (sx->pending_BDAT)
1900 {
1901 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1902
1903 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1904 ob->command_timeout))
1905 {
1906 if (errno == 0 && sx->buffer[0] == '4')
1907 {
1908 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1909 sx->addrlist->more_errno |=
1910 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1911 }
1912 return ERROR;
1913 }
1914 cmd_count--;
1915 sx->pending_BDAT = FALSE;
1916 pipelining_active = FALSE;
1917 }
1918 else if (chunk_size > 0)
1919 sx->pending_BDAT = TRUE;
1920
1921
1922 sx->cmd_count = cmd_count;
1923 return OK;
1924 }
1925
1926
1927
1928
1929
1930 /*************************************************
1931 * Make connection for given message *
1932 *************************************************/
1933
1934 /*
1935 Arguments:
1936 ctx connection context
1937 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1938 a second attempt after TLS initialization fails
1939
1940 Returns: OK - the connection was made and the delivery attempted;
1941 fd is set in the conn context, tls_out set up.
1942 DEFER - the connection could not be made, or something failed
1943 while setting up the SMTP session, or there was a
1944 non-message-specific error, such as a timeout.
1945 ERROR - helo_data or add_headers or authenticated_sender is
1946 specified for this transport, and the string failed
1947 to expand
1948 */
1949 int
1950 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1951 {
1952 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1953 dns_answer tlsa_dnsa;
1954 #endif
1955 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1956 BOOL pass_message = FALSE;
1957 uschar * message = NULL;
1958 int yield = OK;
1959 int rc;
1960 #ifdef SUPPORT_TLS
1961 uschar * tls_errstr;
1962 #endif
1963
1964 sx->conn_args.ob = ob;
1965
1966 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1967 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1968 sx->ok = FALSE;
1969 sx->send_rset = TRUE;
1970 sx->send_quit = TRUE;
1971 sx->setting_up = TRUE;
1972 sx->esmtp = TRUE;
1973 sx->esmtp_sent = FALSE;
1974 #ifdef SUPPORT_I18N
1975 sx->utf8_needed = FALSE;
1976 #endif
1977 sx->dsn_all_lasthop = TRUE;
1978 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1979 sx->dane = FALSE;
1980 sx->dane_required =
1981 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1982 #endif
1983 #ifdef EXPERIMENTAL_PIPE_CONNECT
1984 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1985 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1986 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1987 #endif
1988
1989 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1990 sx->peer_offered = 0;
1991 sx->avoid_option = 0;
1992 sx->igquotstr = US"";
1993 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1994 #ifdef EXPERIMENTAL_DSN_INFO
1995 sx->smtp_greeting = NULL;
1996 sx->helo_response = NULL;
1997 #endif
1998
1999 smtp_command = US"initial connection";
2000 sx->buffer[0] = '\0';
2001
2002 /* Set up the buffer for reading SMTP response packets. */
2003
2004 sx->inblock.buffer = sx->inbuffer;
2005 sx->inblock.buffersize = sizeof(sx->inbuffer);
2006 sx->inblock.ptr = sx->inbuffer;
2007 sx->inblock.ptrend = sx->inbuffer;
2008
2009 /* Set up the buffer for holding SMTP commands while pipelining */
2010
2011 sx->outblock.buffer = sx->outbuffer;
2012 sx->outblock.buffersize = sizeof(sx->outbuffer);
2013 sx->outblock.ptr = sx->outbuffer;
2014 sx->outblock.cmd_count = 0;
2015 sx->outblock.authenticating = FALSE;
2016 sx->outblock.conn_args = NULL;
2017
2018 /* Reset the parameters of a TLS session. */
2019
2020 tls_out.bits = 0;
2021 tls_out.cipher = NULL; /* the one we may use for this transport */
2022 tls_out.ourcert = NULL;
2023 tls_out.peercert = NULL;
2024 tls_out.peerdn = NULL;
2025 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2026 tls_out.sni = NULL;
2027 #endif
2028 tls_out.ocsp = OCSP_NOT_REQ;
2029
2030 /* Flip the legacy TLS-related variables over to the outbound set in case
2031 they're used in the context of the transport. Don't bother resetting
2032 afterward (when being used by a transport) as we're in a subprocess.
2033 For verify, unflipped once the callout is dealt with */
2034
2035 tls_modify_variables(&tls_out);
2036
2037 #ifndef SUPPORT_TLS
2038 if (sx->smtps)
2039 {
2040 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2041 DEFER, FALSE);
2042 return ERROR;
2043 }
2044 #endif
2045
2046 /* Make a connection to the host if this isn't a continued delivery, and handle
2047 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2048 specially so they can be identified for retries. */
2049
2050 if (!continue_hostname)
2051 {
2052 if (sx->verify)
2053 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2054
2055 /* Get the actual port the connection will use, into sx->conn_args.host */
2056
2057 smtp_port_for_connect(sx->conn_args.host, sx->port);
2058
2059 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2060 /* Do TLSA lookup for DANE */
2061 {
2062 tls_out.dane_verified = FALSE;
2063 tls_out.tlsa_usage = 0;
2064
2065 if (sx->conn_args.host->dnssec == DS_YES)
2066 {
2067 if( sx->dane_required
2068 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2069 )
2070 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2071 {
2072 case OK: sx->dane = TRUE;
2073 ob->tls_tempfail_tryclear = FALSE;
2074 break;
2075 case FAIL_FORCED: break;
2076 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2077 string_sprintf("DANE error: tlsa lookup %s",
2078 rc_to_string(rc)),
2079 rc, FALSE);
2080 # ifndef DISABLE_EVENT
2081 (void) event_raise(sx->conn_args.tblock->event_action,
2082 US"dane:fail", sx->dane_required
2083 ? US"dane-required" : US"dnssec-invalid");
2084 # endif
2085 return rc;
2086 }
2087 }
2088 else if (sx->dane_required)
2089 {
2090 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2091 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2092 FAIL, FALSE);
2093 # ifndef DISABLE_EVENT
2094 (void) event_raise(sx->conn_args.tblock->event_action,
2095 US"dane:fail", US"dane-required");
2096 # endif
2097 return FAIL;
2098 }
2099 }
2100 #endif /*DANE*/
2101
2102 /* Make the TCP connection */
2103
2104 sx->cctx.tls_ctx = NULL;
2105 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2106 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2107
2108 #ifdef EXPERIMENTAL_PIPE_CONNECT
2109 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2110 {
2111 sx->early_pipe_ok = TRUE;
2112 if ( read_ehlo_cache_entry(sx)
2113 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2114 {
2115 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2116 sx->early_pipe_active = TRUE;
2117 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2118 }
2119 }
2120
2121 if (sx->early_pipe_active)
2122 sx->outblock.conn_args = &sx->conn_args;
2123 else
2124 #endif
2125 {
2126 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2127 {
2128 uschar * msg = NULL;
2129 if (sx->verify)
2130 {
2131 msg = US strerror(errno);
2132 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2133 }
2134 set_errno_nohost(sx->addrlist,
2135 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2136 sx->verify ? string_sprintf("could not connect: %s", msg)
2137 : NULL,
2138 DEFER, FALSE);
2139 sx->send_quit = FALSE;
2140 return DEFER;
2141 }
2142 }
2143 /* Expand the greeting message while waiting for the initial response. (Makes
2144 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2145 delayed till here so that $sending_interface and $sending_port are set. */
2146 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2147 will be? Somehow I doubt it. */
2148
2149 if (sx->helo_data)
2150 if (!(sx->helo_data = expand_string(sx->helo_data)))
2151 if (sx->verify)
2152 log_write(0, LOG_MAIN|LOG_PANIC,
2153 "<%s>: failed to expand transport's helo_data value for callout: %s",
2154 sx->addrlist->address, expand_string_message);
2155
2156 #ifdef SUPPORT_I18N
2157 if (sx->helo_data)
2158 {
2159 expand_string_message = NULL;
2160 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2161 &expand_string_message)),
2162 expand_string_message)
2163 if (sx->verify)
2164 log_write(0, LOG_MAIN|LOG_PANIC,
2165 "<%s>: failed to expand transport's helo_data value for callout: %s",
2166 sx->addrlist->address, expand_string_message);
2167 else
2168 sx->helo_data = NULL;
2169 }
2170 #endif
2171
2172 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2173 is nevertheless a reasonably clean way of programming this kind of logic,
2174 where you want to escape on any error. */
2175
2176 if (!sx->smtps)
2177 {
2178 #ifdef EXPERIMENTAL_PIPE_CONNECT
2179 if (sx->early_pipe_active)
2180 {
2181 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2182 sx->outblock.cmd_count = 1;
2183 }
2184 else
2185 #endif
2186 {
2187 #ifdef TCP_QUICKACK
2188 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2189 sizeof(off));
2190 #endif
2191 if (!smtp_reap_banner(sx))
2192 goto RESPONSE_FAILED;
2193 }
2194
2195 #ifndef DISABLE_EVENT
2196 {
2197 uschar * s;
2198 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2199 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2200 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2201 if (s)
2202 {
2203 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2204 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2205 DEFER, FALSE);
2206 yield = DEFER;
2207 goto SEND_QUIT;
2208 }
2209 }
2210 #endif
2211
2212 /* Now check if the helo_data expansion went well, and sign off cleanly if
2213 it didn't. */
2214
2215 if (!sx->helo_data)
2216 {
2217 message = string_sprintf("failed to expand helo_data: %s",
2218 expand_string_message);
2219 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2220 yield = DEFER;
2221 goto SEND_QUIT;
2222 }
2223 }
2224
2225 /** Debugging without sending a message
2226 sx->addrlist->transport_return = DEFER;
2227 goto SEND_QUIT;
2228 **/
2229
2230 /* Errors that occur after this point follow an SMTP command, which is
2231 left in big_buffer by smtp_write_command() for use in error messages. */
2232
2233 smtp_command = big_buffer;
2234
2235 /* Tell the remote who we are...
2236
2237 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2238 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2239 greeting is of this form. The assumption was that the far end supports it
2240 properly... but experience shows that there are some that give 5xx responses,
2241 even though the banner includes "ESMTP" (there's a bloody-minded one that
2242 says "ESMTP not spoken here"). Cope with that case.
2243
2244 September 2000: Time has passed, and it seems reasonable now to always send
2245 EHLO at the start. It is also convenient to make the change while installing
2246 the TLS stuff.
2247
2248 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2249 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2250 would be no way to send out the mails, so there is now a host list
2251 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2252 PIPELINING problem as well. Maybe it can also be useful to cure other
2253 problems with broken servers.
2254
2255 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2256 Then somebody tried it with a Microsoft mailer... It seems that all other
2257 mailers use upper case for some reason (the RFC is quite clear about case
2258 independence) so, for peace of mind, I gave in. */
2259
2260 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2261
2262 /* Alas; be careful, since this goto is not an error-out, so conceivably
2263 we might set data between here and the target which we assume to exist
2264 and be usable. I can see this coming back to bite us. */
2265 #ifdef SUPPORT_TLS
2266 if (sx->smtps)
2267 {
2268 smtp_peer_options |= OPTION_TLS;
2269 suppress_tls = FALSE;
2270 ob->tls_tempfail_tryclear = FALSE;
2271 smtp_command = US"SSL-on-connect";
2272 goto TLS_NEGOTIATE;
2273 }
2274 #endif
2275
2276 if (sx->esmtp)
2277 {
2278 if (smtp_write_command(sx,
2279 #ifdef EXPERIMENTAL_PIPE_CONNECT
2280 sx->early_pipe_active ? SCMD_BUFFER :
2281 #endif
2282 SCMD_FLUSH,
2283 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2284 goto SEND_FAILED;
2285 sx->esmtp_sent = TRUE;
2286
2287 #ifdef EXPERIMENTAL_PIPE_CONNECT
2288 if (sx->early_pipe_active)
2289 {
2290 sx->pending_EHLO = TRUE;
2291
2292 /* If we have too many authenticators to handle and might need to AUTH
2293 for this transport, pipeline no further as we will need the
2294 list of auth methods offered. Reap the banner and EHLO. */
2295
2296 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2297 && f.smtp_in_early_pipe_no_auth)
2298 {
2299 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2300 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2301 goto SEND_FAILED;
2302 if (sync_responses(sx, 2, 0) != 0)
2303 {
2304 HDEBUG(D_transport)
2305 debug_printf("failed reaping pipelined cmd responses\n");
2306 goto RESPONSE_FAILED;
2307 }
2308 sx->early_pipe_active = FALSE;
2309 }
2310 }
2311 else
2312 #endif
2313 if (!smtp_reap_ehlo(sx))
2314 goto RESPONSE_FAILED;
2315 }
2316 else
2317 DEBUG(D_transport)
2318 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2319
2320 #ifdef EXPERIMENTAL_PIPE_CONNECT
2321 if (!sx->early_pipe_active)
2322 #endif
2323 if (!sx->esmtp)
2324 {
2325 BOOL good_response;
2326 int n = sizeof(sx->buffer);
2327 uschar * rsp = sx->buffer;
2328
2329 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2330 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2331
2332 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2333 goto SEND_FAILED;
2334 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2335 #ifdef EXPERIMENTAL_DSN_INFO
2336 sx->helo_response = string_copy(rsp);
2337 #endif
2338 if (!good_response)
2339 {
2340 /* Handle special logging for a closed connection after HELO
2341 when had previously sent EHLO */
2342
2343 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2344 {
2345 errno = ERRNO_SMTPCLOSED;
2346 goto EHLOHELO_FAILED;
2347 }
2348 memmove(sx->buffer, rsp, Ustrlen(rsp));
2349 goto RESPONSE_FAILED;
2350 }
2351 }
2352
2353 if (sx->esmtp || sx->lmtp)
2354 {
2355 #ifdef EXPERIMENTAL_PIPE_CONNECT
2356 if (!sx->early_pipe_active)
2357 #endif
2358 {
2359 sx->peer_offered = ehlo_response(sx->buffer,
2360 OPTION_TLS /* others checked later */
2361 #ifdef EXPERIMENTAL_PIPE_CONNECT
2362 | (sx->early_pipe_ok
2363 ? OPTION_IGNQ
2364 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2365 #ifdef SUPPORT_I18N
2366 | OPTION_UTF8
2367 #endif
2368 | OPTION_EARLY_PIPE
2369 : 0
2370 )
2371 #endif
2372 );
2373 #ifdef EXPERIMENTAL_PIPE_CONNECT
2374 if (sx->early_pipe_ok)
2375 {
2376 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2377
2378 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2379 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2380 {
2381 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2382 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2383 write_ehlo_cache_entry(sx);
2384 }
2385 }
2386 #endif
2387 }
2388
2389 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2390
2391 #ifdef SUPPORT_TLS
2392 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2393 #endif
2394 }
2395 }
2396
2397 /* For continuing deliveries down the same channel, having re-exec'd the socket
2398 is the standard input; for a socket held open from verify it is recorded
2399 in the cutthrough context block. Either way we don't need to redo EHLO here
2400 (but may need to do so for TLS - see below).
2401 Set up the pointer to where subsequent commands will be left, for
2402 error messages. Note that smtp_peer_options will have been
2403 set from the command line if they were set in the process that passed the
2404 connection on. */
2405
2406 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2407 as the continue goes via transport_pass_socket() and doublefork and exec.
2408 It does not wait. Unclear how we keep separate host's responses
2409 separate - we could match up by host ip+port as a bodge. */
2410
2411 else
2412 {
2413 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2414 {
2415 sx->cctx = cutthrough.cctx;
2416 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2417 }
2418 else
2419 {
2420 sx->cctx.sock = 0; /* stdin */
2421 sx->cctx.tls_ctx = NULL;
2422 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2423 }
2424 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2425 smtp_command = big_buffer;
2426 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2427
2428 /* For a continued connection with TLS being proxied for us, or a
2429 held-open verify connection with TLS, nothing more to do. */
2430
2431 if ( continue_proxy_cipher
2432 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2433 && cutthrough.is_tls)
2434 )
2435 {
2436 sx->peer_offered = smtp_peer_options;
2437 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2438 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2439 continue_proxy_cipher ? "proxied" : "verify conn with");
2440 return OK;
2441 }
2442 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2443 }
2444
2445 /* If TLS is available on this connection, whether continued or not, attempt to
2446 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2447 send another EHLO - the server may give a different answer in secure mode. We
2448 use a separate buffer for reading the response to STARTTLS so that if it is
2449 negative, the original EHLO data is available for subsequent analysis, should
2450 the client not be required to use TLS. If the response is bad, copy the buffer
2451 for error analysis. */
2452
2453 #ifdef SUPPORT_TLS
2454 if ( smtp_peer_options & OPTION_TLS
2455 && !suppress_tls
2456 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2457 && ( !sx->verify
2458 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2459 ) )
2460 {
2461 uschar buffer2[4096];
2462
2463 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2464 goto SEND_FAILED;
2465
2466 #ifdef EXPERIMENTAL_PIPE_CONNECT
2467 /* If doing early-pipelining reap the banner and EHLO-response but leave
2468 the response for the STARTTLS we just sent alone. */
2469
2470 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2471 {
2472 HDEBUG(D_transport)
2473 debug_printf("failed reaping pipelined cmd responses\n");
2474 goto RESPONSE_FAILED;
2475 }
2476 #endif
2477
2478 /* If there is an I/O error, transmission of this message is deferred. If
2479 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2480 false, we also defer. However, if there is a temporary rejection of STARTTLS
2481 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2482 STARTTLS, we carry on. This means we will try to send the message in clear,
2483 unless the host is in hosts_require_tls (tested below). */
2484
2485 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2486 {
2487 if ( errno != 0
2488 || buffer2[0] == 0
2489 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2490 )
2491 {
2492 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2493 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2494 goto RESPONSE_FAILED;
2495 }
2496 }
2497
2498 /* STARTTLS accepted: try to negotiate a TLS session. */
2499
2500 else
2501 TLS_NEGOTIATE:
2502 {
2503 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2504 sx->addrlist, sx->conn_args.tblock,
2505 # ifdef SUPPORT_DANE
2506 sx->dane ? &tlsa_dnsa : NULL,
2507 # endif
2508 &tls_out, &tls_errstr);
2509
2510 if (!sx->cctx.tls_ctx)
2511 {
2512 /* TLS negotiation failed; give an error. From outside, this function may
2513 be called again to try in clear on a new connection, if the options permit
2514 it for this host. */
2515 GNUTLS_CONN_FAILED:
2516 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2517
2518 # ifdef SUPPORT_DANE
2519 if (sx->dane)
2520 {
2521 log_write(0, LOG_MAIN,
2522 "DANE attempt failed; TLS connection to %s [%s]: %s",
2523 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2524 # ifndef DISABLE_EVENT
2525 (void) event_raise(sx->conn_args.tblock->event_action,
2526 US"dane:fail", US"validation-failure"); /* could do with better detail */
2527 # endif
2528 }
2529 # endif
2530
2531 errno = ERRNO_TLSFAILURE;
2532 message = string_sprintf("TLS session: %s", tls_errstr);
2533 sx->send_quit = FALSE;
2534 goto TLS_FAILED;
2535 }
2536
2537 /* TLS session is set up */
2538
2539 smtp_peer_options_wrap = smtp_peer_options;
2540 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2541 if (addr->transport_return == PENDING_DEFER)
2542 {
2543 addr->cipher = tls_out.cipher;
2544 addr->ourcert = tls_out.ourcert;
2545 addr->peercert = tls_out.peercert;
2546 addr->peerdn = tls_out.peerdn;
2547 addr->ocsp = tls_out.ocsp;
2548 }
2549 }
2550 }
2551
2552 /* if smtps, we'll have smtp_command set to something else; always safe to
2553 reset it here. */
2554 smtp_command = big_buffer;
2555
2556 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2557 helo_data is null, we are dealing with a connection that was passed from
2558 another process, and so we won't have expanded helo_data above. We have to
2559 expand it here. $sending_ip_address and $sending_port are set up right at the
2560 start of the Exim process (in exim.c). */
2561
2562 if (tls_out.active.sock >= 0)
2563 {
2564 uschar * greeting_cmd;
2565
2566 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2567 {
2568 uschar *message = string_sprintf("failed to expand helo_data: %s",
2569 expand_string_message);
2570 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2571 yield = DEFER;
2572 goto SEND_QUIT;
2573 }
2574
2575 #ifdef EXPERIMENTAL_PIPE_CONNECT
2576 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2577 We're unlikely to get the group sent and delivered before the server sends its
2578 banner, but it's still worth sending as a group.
2579 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2580 the reverse. */
2581
2582 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2583 {
2584 sx->peer_offered = sx->ehlo_resp.crypted_features;
2585 if ((sx->early_pipe_active =
2586 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2587 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2588 }
2589 #endif
2590
2591 /* For SMTPS we need to wait for the initial OK response. */
2592 if (sx->smtps)
2593 #ifdef EXPERIMENTAL_PIPE_CONNECT
2594 if (sx->early_pipe_active)
2595 {
2596 sx->pending_BANNER = TRUE;
2597 sx->outblock.cmd_count = 1;
2598 }
2599 else
2600 #endif
2601 if (!smtp_reap_banner(sx))
2602 goto RESPONSE_FAILED;
2603
2604 if (sx->lmtp)
2605 greeting_cmd = US"LHLO";
2606 else if (sx->esmtp)
2607 greeting_cmd = US"EHLO";
2608 else
2609 {
2610 greeting_cmd = US"HELO";
2611 DEBUG(D_transport)
2612 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2613 }
2614
2615 if (smtp_write_command(sx,
2616 #ifdef EXPERIMENTAL_PIPE_CONNECT
2617 sx->early_pipe_active ? SCMD_BUFFER :
2618 #endif
2619 SCMD_FLUSH,
2620 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2621 goto SEND_FAILED;
2622
2623 #ifdef EXPERIMENTAL_PIPE_CONNECT
2624 if (sx->early_pipe_active)
2625 sx->pending_EHLO = TRUE;
2626 else
2627 #endif
2628 {
2629 if (!smtp_reap_ehlo(sx))
2630 #ifdef USE_GNUTLS
2631 {
2632 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2633 cert late, under TLS1.3 - which means here; the first time we try to
2634 receive crypted data. Treat it as if it was a connect-time failure.
2635 See also the early-pipe equivalent... which will be hard; every call
2636 to sync_responses will need to check the result.
2637 It would be nicer to have GnuTLS check the cert during the handshake.
2638 Can it do that, with all the flexibility we need? */
2639
2640 tls_errstr = US"error on first read";
2641 goto GNUTLS_CONN_FAILED;
2642 }
2643 #else
2644 goto RESPONSE_FAILED;
2645 #endif
2646 smtp_peer_options = 0;
2647 }
2648 }
2649
2650 /* If the host is required to use a secure channel, ensure that we
2651 have one. */
2652
2653 else if ( sx->smtps
2654 # ifdef SUPPORT_DANE
2655 || sx->dane
2656 # endif
2657 # ifdef EXPERIMENTAL_REQUIRETLS
2658 || tls_requiretls & REQUIRETLS_MSG
2659 # endif
2660 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2661 )
2662 {
2663 errno =
2664 # ifdef EXPERIMENTAL_REQUIRETLS
2665 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2666 # endif
2667 ERRNO_TLSREQUIRED;
2668 message = string_sprintf("a TLS session is required, but %s",
2669 smtp_peer_options & OPTION_TLS
2670 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2671 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2672 if (sx->dane)
2673 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2674 smtp_peer_options & OPTION_TLS
2675 ? US"validation-failure" /* could do with better detail */
2676 : US"starttls-not-supported");
2677 # endif
2678 goto TLS_FAILED;
2679 }
2680 #endif /*SUPPORT_TLS*/
2681
2682 /* If TLS is active, we have just started it up and re-done the EHLO command,
2683 so its response needs to be analyzed. If TLS is not active and this is a
2684 continued session down a previously-used socket, we haven't just done EHLO, so
2685 we skip this. */
2686
2687 if (continue_hostname == NULL
2688 #ifdef SUPPORT_TLS
2689 || tls_out.active.sock >= 0
2690 #endif
2691 )
2692 {
2693 if (sx->esmtp || sx->lmtp)
2694 {
2695 #ifdef EXPERIMENTAL_PIPE_CONNECT
2696 if (!sx->early_pipe_active)
2697 #endif
2698 {
2699 sx->peer_offered = ehlo_response(sx->buffer,
2700 0 /* no TLS */
2701 #ifdef EXPERIMENTAL_PIPE_CONNECT
2702 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2703 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2704 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2705 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2706
2707 #else
2708
2709 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2710 | OPTION_CHUNKING
2711 | OPTION_PRDR
2712 # ifdef SUPPORT_I18N
2713 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2714 /*XXX if we hand peercaps on to continued-conn processes,
2715 must not depend on this addr */
2716 # endif
2717 | OPTION_DSN
2718 | OPTION_PIPE
2719 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2720 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2721 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2722 # endif
2723 #endif
2724 );
2725 #ifdef EXPERIMENTAL_PIPE_CONNECT
2726 if (tls_out.active.sock >= 0)
2727 sx->ehlo_resp.crypted_features = sx->peer_offered;
2728 #endif
2729 }
2730
2731 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2732 lmtp_ignore_quota option was set. */
2733
2734 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2735
2736 /* If the response to EHLO specified support for the SIZE parameter, note
2737 this, provided size_addition is non-negative. */
2738
2739 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2740
2741 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2742 the current host, esmtp will be false, so PIPELINING can never be used. If
2743 the current host matches hosts_avoid_pipelining, don't do it. */
2744
2745 if ( sx->peer_offered & OPTION_PIPE
2746 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2747 smtp_peer_options |= OPTION_PIPE;
2748
2749 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2750 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2751
2752 if ( sx->peer_offered & OPTION_CHUNKING
2753 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2754 sx->peer_offered &= ~OPTION_CHUNKING;
2755
2756 if (sx->peer_offered & OPTION_CHUNKING)
2757 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2758
2759 #ifndef DISABLE_PRDR
2760 if ( sx->peer_offered & OPTION_PRDR
2761 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2762 sx->peer_offered &= ~OPTION_PRDR;
2763
2764 if (sx->peer_offered & OPTION_PRDR)
2765 DEBUG(D_transport) debug_printf("PRDR usable\n");
2766 #endif
2767
2768 /* Note if the server supports DSN */
2769 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2770 DEBUG(D_transport) debug_printf("%susing DSN\n",
2771 sx->peer_offered & OPTION_DSN ? "" : "not ");
2772
2773 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2774 if (sx->peer_offered & OPTION_REQUIRETLS)
2775 {
2776 smtp_peer_options |= OPTION_REQUIRETLS;
2777 DEBUG(D_transport) debug_printf(
2778 tls_requiretls & REQUIRETLS_MSG
2779 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2780 }
2781 #endif
2782
2783 #ifdef EXPERIMENTAL_PIPE_CONNECT
2784 if ( sx->early_pipe_ok
2785 && !sx->early_pipe_active
2786 && tls_out.active.sock >= 0
2787 && smtp_peer_options & OPTION_PIPE
2788 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2789 & OPTION_EARLY_PIPE)
2790 {
2791 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2792 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2793 write_ehlo_cache_entry(sx);
2794 }
2795 #endif
2796
2797 /* Note if the response to EHLO specifies support for the AUTH extension.
2798 If it has, check that this host is one we want to authenticate to, and do
2799 the business. The host name and address must be available when the
2800 authenticator's client driver is running. */
2801
2802 switch (yield = smtp_auth(sx))
2803 {
2804 default: goto SEND_QUIT;
2805 case OK: break;
2806 case FAIL_SEND: goto SEND_FAILED;
2807 case FAIL: goto RESPONSE_FAILED;
2808 }
2809 }
2810 }
2811 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2812
2813 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2814 message-specific. */
2815
2816 sx->setting_up = FALSE;
2817
2818 #ifdef SUPPORT_I18N
2819 if (sx->addrlist->prop.utf8_msg)
2820 {
2821 uschar * s;
2822
2823 /* If the transport sets a downconversion mode it overrides any set by ACL
2824 for the message. */
2825
2826 if ((s = ob->utf8_downconvert))
2827 {
2828 if (!(s = expand_string(s)))
2829 {
2830 message = string_sprintf("failed to expand utf8_downconvert: %s",
2831 expand_string_message);
2832 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2833 yield = DEFER;
2834 goto SEND_QUIT;
2835 }
2836 switch (*s)
2837 {
2838 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2839 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2840 break;
2841 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2842 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2843 break;
2844 case '-': if (s[1] == '1')
2845 {
2846 sx->addrlist->prop.utf8_downcvt = FALSE;
2847 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2848 }
2849 break;
2850 }
2851 }
2852
2853 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2854 && !sx->addrlist->prop.utf8_downcvt_maybe;
2855 DEBUG(D_transport) if (!sx->utf8_needed)
2856 debug_printf("utf8: %s downconvert\n",
2857 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2858 }
2859
2860 /* If this is an international message we need the host to speak SMTPUTF8 */
2861 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2862 {
2863 errno = ERRNO_UTF8_FWD;
2864 goto RESPONSE_FAILED;
2865 }
2866 #endif /*SUPPORT_I18N*/
2867
2868 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2869 /*XXX should tls_requiretls actually be per-addr? */
2870
2871 if ( tls_requiretls & REQUIRETLS_MSG
2872 && !(sx->peer_offered & OPTION_REQUIRETLS)
2873 )
2874 {
2875 sx->setting_up = TRUE;
2876 errno = ERRNO_REQUIRETLS;
2877 message = US"REQUIRETLS support is required from the server"
2878 " but it was not offered";
2879 DEBUG(D_transport) debug_printf("%s\n", message);
2880 goto TLS_FAILED;
2881 }
2882 #endif
2883
2884 return OK;
2885
2886
2887 {
2888 int code;
2889
2890 RESPONSE_FAILED:
2891 message = NULL;
2892 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2893 sx->buffer, &code, &message, &pass_message);
2894 yield = DEFER;
2895 goto FAILED;
2896
2897 SEND_FAILED:
2898 code = '4';
2899 message = US string_sprintf("send() to %s [%s] failed: %s",
2900 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2901 sx->send_quit = FALSE;
2902 yield = DEFER;
2903 goto FAILED;
2904
2905 EHLOHELO_FAILED:
2906 code = '4';
2907 message = string_sprintf("Remote host closed connection in response to %s"
2908 " (EHLO response was: %s)", smtp_command, sx->buffer);
2909 sx->send_quit = FALSE;
2910 yield = DEFER;
2911 goto FAILED;
2912
2913 /* This label is jumped to directly when a TLS negotiation has failed,
2914 or was not done for a host for which it is required. Values will be set
2915 in message and errno, and setting_up will always be true. Treat as
2916 a temporary error. */
2917
2918 #ifdef SUPPORT_TLS
2919 TLS_FAILED:
2920 # ifdef EXPERIMENTAL_REQUIRETLS
2921 if (errno == ERRNO_REQUIRETLS)
2922 code = '5', yield = FAIL;
2923 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2924 else
2925 # endif
2926 code = '4', yield = DEFER;
2927 goto FAILED;
2928 #endif
2929
2930 /* The failure happened while setting up the call; see if the failure was
2931 a 5xx response (this will either be on connection, or following HELO - a 5xx
2932 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2933 fail all addresses, as this host is never going to accept them. For other
2934 errors during setting up (timeouts or whatever), defer all addresses, and
2935 yield DEFER, so that the host is not tried again for a while.
2936
2937 XXX This peeking for another host feels like a layering violation. We want
2938 to note the host as unusable, but down here we shouldn't know if this was
2939 the last host to try for the addr(list). Perhaps the upper layer should be
2940 the one to do set_errno() ? The problem is that currently the addr is where
2941 errno etc. are stashed, but until we run out of hosts to try the errors are
2942 host-specific. Maybe we should enhance the host_item definition? */
2943
2944 FAILED:
2945 sx->ok = FALSE; /* For when reached by GOTO */
2946 set_errno(sx->addrlist, errno, message,
2947 sx->conn_args.host->next
2948 ? DEFER
2949 : code == '5'
2950 #ifdef SUPPORT_I18N
2951 || errno == ERRNO_UTF8_FWD
2952 #endif
2953 ? FAIL : DEFER,
2954 pass_message, sx->conn_args.host
2955 #ifdef EXPERIMENTAL_DSN_INFO
2956 , sx->smtp_greeting, sx->helo_response
2957 #endif
2958 );
2959 }
2960
2961
2962 SEND_QUIT:
2963
2964 if (sx->send_quit)
2965 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2966
2967 #ifdef SUPPORT_TLS
2968 if (sx->cctx.tls_ctx)
2969 {
2970 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2971 sx->cctx.tls_ctx = NULL;
2972 }
2973 #endif
2974
2975 /* Close the socket, and return the appropriate value, first setting
2976 works because the NULL setting is passed back to the calling process, and
2977 remote_max_parallel is forced to 1 when delivering over an existing connection,
2978 */
2979
2980 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2981 if (sx->send_quit)
2982 {
2983 shutdown(sx->cctx.sock, SHUT_WR);
2984 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2985 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2986 i--; /* drain socket */
2987 sx->send_quit = FALSE;
2988 }
2989 (void)close(sx->cctx.sock);
2990 sx->cctx.sock = -1;
2991
2992 #ifndef DISABLE_EVENT
2993 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2994 #endif
2995
2996 continue_transport = NULL;
2997 continue_hostname = NULL;
2998 return yield;
2999 }
3000
3001
3002
3003
3004 /* Create the string of options that will be appended to the MAIL FROM:
3005 in the connection context buffer */
3006
3007 static int
3008 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3009 {
3010 uschar * p = sx->buffer;
3011 address_item * addr;
3012 int address_count;
3013
3014 *p = 0;
3015
3016 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3017 send it, adding something to the message size to allow for imprecision
3018 and things that get added en route. Exim keeps the number of lines
3019 in a message, so we can give an accurate value for the original message, but we
3020 need some additional to handle added headers. (Double "." characters don't get
3021 included in the count.) */
3022
3023 if ( message_size > 0
3024 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3025 {
3026 /*XXX problem here under spool_files_wireformat?
3027 Or just forget about lines? Or inflate by a fixed proportion? */
3028
3029 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3030 while (*p) p++;
3031 }
3032
3033 #ifndef DISABLE_PRDR
3034 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3035 request that */
3036
3037 sx->prdr_active = FALSE;
3038 if (sx->peer_offered & OPTION_PRDR)
3039 for (address_item * addr = addrlist; addr; addr = addr->next)
3040 if (addr->transport_return == PENDING_DEFER)
3041 {
3042 for (addr = addr->next; addr; addr = addr->next)
3043 if (addr->transport_return == PENDING_DEFER)
3044 { /* at least two recipients to send */
3045 sx->prdr_active = TRUE;
3046 sprintf(CS p, " PRDR"); p += 5;
3047 break;
3048 }
3049 break;
3050 }
3051 #endif
3052
3053 #ifdef SUPPORT_I18N
3054 /* If it supports internationalised messages, and this meesage need that,
3055 request it */
3056
3057 if ( sx->peer_offered & OPTION_UTF8
3058 && addrlist->prop.utf8_msg
3059 && !addrlist->prop.utf8_downcvt
3060 )
3061 Ustrcpy(p, " SMTPUTF8"), p += 9;
3062 #endif
3063
3064 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3065 if (tls_requiretls & REQUIRETLS_MSG)
3066 Ustrcpy(p, " REQUIRETLS") , p += 11;
3067 #endif
3068
3069 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3070 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3071 addr && address_count < sx->max_rcpt;
3072 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3073 {
3074 address_count++;
3075 if (!(addr->dsn_flags & rf_dsnlasthop))
3076 {
3077 sx->dsn_all_lasthop = FALSE;
3078 break;
3079 }
3080 }
3081
3082 /* Add any DSN flags to the mail command */
3083
3084 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3085 {
3086 if (dsn_ret == dsn_ret_hdrs)
3087 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3088 else if (dsn_ret == dsn_ret_full)
3089 { Ustrcpy(p, " RET=FULL"); p += 9; }
3090
3091 if (dsn_envid)
3092 {
3093 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3094 while (*p) p++;
3095 }
3096 }
3097
3098 /* If an authenticated_sender override has been specified for this transport
3099 instance, expand it. If the expansion is forced to fail, and there was already
3100 an authenticated_sender for this message, the original value will be used.
3101 Other expansion failures are serious. An empty result is ignored, but there is
3102 otherwise no check - this feature is expected to be used with LMTP and other
3103 cases where non-standard addresses (e.g. without domains) might be required. */
3104
3105 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3106 return ERROR;
3107
3108 return OK;
3109 }
3110
3111
3112 static void
3113 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3114 {
3115 uschar * p = sx->buffer;
3116 *p = 0;
3117
3118 /* Add any DSN flags to the rcpt command */
3119
3120 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3121 {
3122 if (addr->dsn_flags & rf_dsnflags)
3123 {
3124 BOOL first = TRUE;
3125
3126 Ustrcpy(p, " NOTIFY=");
3127 while (*p) p++;
3128 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3129 {
3130 if (!first) *p++ = ',';
3131 first = FALSE;
3132 Ustrcpy(p, rf_names[i]);
3133 while (*p) p++;
3134 }
3135 }
3136
3137 if (addr->dsn_orcpt)
3138 {
3139 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3140 addr->dsn_orcpt);
3141 while (*p) p++;
3142 }
3143 }
3144 }
3145
3146
3147
3148 /*
3149 Return:
3150 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3151 -1 MAIL response error
3152 -2 any non-MAIL read i/o error
3153 -3 non-MAIL response timeout
3154 -4 internal error; channel still usable
3155 -5 transmit failed
3156 */
3157
3158 int
3159 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3160 {
3161 address_item * addr;
3162 int address_count;
3163 int rc;
3164
3165 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3166 {
3167 *yield = ERROR;
3168 return -4;
3169 }
3170
3171 /* From here until we send the DATA command, we can make use of PIPELINING
3172 if the server host supports it. The code has to be able to check the responses
3173 at any point, for when the buffer fills up, so we write it totally generally.
3174 When PIPELINING is off, each command written reports that it has flushed the
3175 buffer. */
3176
3177 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3178
3179 {
3180 uschar * s = sx->from_addr;
3181 #ifdef SUPPORT_I18N
3182 uschar * errstr = NULL;
3183
3184 /* If we must downconvert, do the from-address here. Remember we had to
3185 for the to-addresses (done below), and also (ugly) for re-doing when building
3186 the delivery log line. */
3187
3188 if ( sx->addrlist->prop.utf8_msg
3189 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3190 )
3191 {
3192 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3193 {
3194 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3195 *yield = ERROR;
3196 return -4;
3197 }
3198 setflag(sx->addrlist, af_utf8_downcvt);
3199 }
3200 #endif
3201
3202 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3203 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3204 }
3205
3206 mail_command = string_copy(big_buffer); /* Save for later error message */
3207
3208 switch(rc)
3209 {
3210 case -1: /* Transmission error */
3211 return -5;
3212
3213 case +1: /* Cmd was sent */
3214 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3215 (SOB sx->conn_args.ob)->command_timeout))
3216 {
3217 if (errno == 0 && sx->buffer[0] == '4')
3218 {
3219 errno = ERRNO_MAIL4XX;
3220 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3221 }
3222 return -1;
3223 }
3224 sx->pending_MAIL = FALSE;
3225 break;
3226
3227 /* otherwise zero: command queued for pipeline */
3228 }
3229
3230 /* Pass over all the relevant recipient addresses for this host, which are the
3231 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3232 several before we have to read the responses for those seen so far. This
3233 checking is done by a subroutine because it also needs to be done at the end.
3234 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3235 the next one if not all are sent.
3236
3237 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3238 last address because we want to abort if any recipients have any kind of
3239 problem, temporary or permanent. We know that all recipient addresses will have
3240 the PENDING_DEFER status, because only one attempt is ever made, and we know
3241 that max_rcpt will be large, so all addresses will be done at once.
3242
3243 For verify we flush the pipeline after any (the only) rcpt address. */
3244
3245 for (addr = sx->first_addr, address_count = 0;
3246 addr && address_count < sx->max_rcpt;
3247 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3248 {
3249 int count;
3250 BOOL no_flush;
3251 uschar * rcpt_addr;
3252
3253 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3254 ? dsn_support_yes : dsn_support_no;
3255
3256 address_count++;
3257 no_flush = pipelining_active && !sx->verify
3258 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3259
3260 build_rcptcmd_options(sx, addr);
3261
3262 /* Now send the RCPT command, and process outstanding responses when
3263 necessary. After a timeout on RCPT, we just end the function, leaving the
3264 yield as OK, because this error can often mean that there is a problem with
3265 just one address, so we don't want to delay the host. */
3266
3267 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3268
3269 #ifdef SUPPORT_I18N
3270 if ( testflag(sx->addrlist, af_utf8_downcvt)
3271 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3272 )
3273 {
3274 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3275 errno = ERRNO_EXPANDFAIL;
3276 return -5; /*XXX too harsh? */
3277 }
3278 #endif
3279
3280 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3281 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3282
3283 if (count < 0) return -5;
3284 if (count > 0)
3285 {
3286 switch(sync_responses(sx, count, 0))
3287 {
3288 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3289 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3290 break;
3291
3292 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3293 if (!sx->lmtp) /* can't tell about progress yet */
3294 sx->completed_addr = TRUE;
3295 case 0: /* No 2xx or 5xx, but no probs */
3296 break;
3297
3298 case -1: return -3; /* Timeout on RCPT */
3299 case -2: return -2; /* non-MAIL read i/o error */
3300 default: return -1; /* any MAIL error */
3301
3302 #ifdef EXPERIMENTAL_PIPE_CONNECT
3303 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3304 case -5: return -1; /* TLS first-read error */
3305 #endif
3306 }
3307 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3308 }
3309 } /* Loop for next address */
3310
3311 sx->next_addr = addr;
3312 return 0;
3313 }
3314
3315
3316 #ifdef SUPPORT_TLS
3317 /*****************************************************
3318 * Proxy TLS connection for another transport process *
3319 ******************************************************/
3320 /*
3321 Close the unused end of the pipe, fork once more, then use the given buffer
3322 as a staging area, and select on both the given fd and the TLS'd client-fd for
3323 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3324 Do blocking full-size writes, and reads under a timeout. Once both input
3325 channels are closed, exit the process.
3326
3327 Arguments:
3328 ct_ctx tls context
3329 buf space to use for buffering
3330 bufsiz size of buffer
3331 pfd pipe filedescriptor array; [0] is comms to proxied process
3332 timeout per-read timeout, seconds
3333 */
3334
3335 void
3336 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3337 int timeout)
3338 {
3339 fd_set rfds, efds;
3340 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3341 int rc, i;
3342
3343 close(pfd[1]);
3344 if ((rc = fork()))
3345 {
3346 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3347 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3348 }
3349
3350 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3351 set_process_info("proxying TLS connection for continued transport");
3352 FD_ZERO(&rfds);
3353 FD_SET(tls_out.active.sock, &rfds);
3354 FD_SET(pfd[0], &rfds);
3355
3356 for (int fd_bits = 3; fd_bits; )
3357 {
3358 time_t time_left = timeout;
3359 time_t time_start = time(NULL);
3360
3361 /* wait for data */
3362 efds = rfds;
3363 do
3364 {
3365 struct timeval tv = { time_left, 0 };
3366
3367 rc = select(max_fd,
3368 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3369
3370 if (rc < 0 && errno == EINTR)
3371 if ((time_left -= time(NULL) - time_start) > 0) continue;
3372
3373 if (rc <= 0)
3374 {
3375 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3376 goto done;
3377 }
3378
3379 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3380 {
3381 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3382 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3383 goto done;
3384 }
3385 }
3386 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3387
3388 /* handle inbound data */
3389 if (FD_ISSET(tls_out.active.sock, &rfds))
3390 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3391 {
3392 fd_bits &= ~1;
3393 FD_CLR(tls_out.active.sock, &rfds);
3394 shutdown(pfd[0], SHUT_WR);
3395 timeout = 5;
3396 }
3397 else
3398 {
3399 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3400 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3401 }
3402 else if (fd_bits & 1)
3403 FD_SET(tls_out.active.sock, &rfds);
3404
3405 /* handle outbound data */
3406 if (FD_ISSET(pfd[0], &rfds))
3407 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3408 {
3409 fd_bits = 0;
3410 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3411 ct_ctx = NULL;
3412 }
3413 else
3414 {
3415 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3416 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3417 goto done;
3418 }
3419 else if (fd_bits & 2)
3420 FD_SET(pfd[0], &rfds);
3421 }
3422
3423 done:
3424 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3425 exim_exit(0, US"TLS proxy");
3426 }
3427 #endif
3428
3429
3430 /*************************************************
3431 * Deliver address list to given host *
3432 *************************************************/
3433
3434 /* If continue_hostname is not null, we get here only when continuing to
3435 deliver down an existing channel. The channel was passed as the standard
3436 input. TLS is never active on a passed channel; the previous process always
3437 closes it down before passing the connection on.
3438
3439 Otherwise, we have to make a connection to the remote host, and do the
3440 initial protocol exchange.
3441
3442 When running as an MUA wrapper, if the sender or any recipient is rejected,
3443 temporarily or permanently, we force failure for all recipients.
3444
3445 Arguments:
3446 addrlist chain of potential addresses to deliver; only those whose
3447 transport_return field is set to PENDING_DEFER are currently
3448 being processed; others should be skipped - they have either
3449 been delivered to an earlier host or IP address, or been
3450 failed by one of them.
3451 host host to deliver to
3452 host_af AF_INET or AF_INET6
3453 defport default TCP/IP port to use if host does not specify, in host
3454 byte order
3455 interface interface to bind to, or NULL
3456 tblock transport instance block
3457 message_defer set TRUE if yield is OK, but all addresses were deferred
3458 because of a non-recipient, non-host failure, that is, a
3459 4xx response to MAIL FROM, DATA, or ".". This is a defer
3460 that is specific to the message.
3461 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3462 a second attempt after TLS initialization fails
3463
3464 Returns: OK - the connection was made and the delivery attempted;
3465 the result for each address is in its data block.
3466 DEFER - the connection could not be made, or something failed
3467 while setting up the SMTP session, or there was a
3468 non-message-specific error, such as a timeout.
3469 ERROR - a filter command is specified for this transport,
3470 and there was a problem setting it up; OR helo_data
3471 or add_headers or authenticated_sender is specified
3472 for this transport, and the string failed to expand
3473 */
3474
3475 static int
3476 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3477 uschar *interface, transport_instance *tblock,
3478 BOOL *message_defer, BOOL suppress_tls)
3479 {
3480 smtp_transport_options_block * ob = SOB tblock->options_block;
3481 int yield = OK;
3482 int save_errno;
3483 int rc;
3484 struct timeval start_delivery_time;
3485
3486 BOOL pass_message = FALSE;
3487 uschar *message = NULL;
3488 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3489
3490 smtp_context sx;
3491
3492 gettimeofday(&start_delivery_time, NULL);
3493 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3494 *message_defer = FALSE;
3495
3496 sx.addrlist = addrlist;
3497 sx.conn_args.host = host;
3498 sx.conn_args.host_af = host_af,
3499 sx.port = defport;
3500 sx.conn_args.interface = interface;
3501 sx.helo_data = NULL;
3502 sx.conn_args.tblock = tblock;
3503 sx.verify = FALSE;
3504 sx.sync_addr = sx.first_addr = addrlist;
3505
3506 /* Get the channel set up ready for a message (MAIL FROM being the next
3507 SMTP command to send */
3508
3509 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3510 return rc;
3511
3512 /* If there is a filter command specified for this transport, we can now
3513 set it up. This cannot be done until the identify of the host is known. */
3514
3515 if (tblock->filter_command)
3516 {
3517 transport_filter_timeout = tblock->filter_timeout;
3518
3519 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3520 yield ERROR. */
3521
3522 if (!transport_set_up_command(&transport_filter_argv,
3523 tblock->filter_command, TRUE, DEFER, addrlist,
3524 string_sprintf("%.50s transport", tblock->name), NULL))
3525 {
3526 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3527 FALSE);
3528 yield = ERROR;
3529 goto SEND_QUIT;
3530 }
3531
3532 if ( transport_filter_argv
3533 && *transport_filter_argv
3534 && **transport_filter_argv
3535 && sx.peer_offered & OPTION_CHUNKING
3536 )
3537 {
3538 sx.peer_offered &= ~OPTION_CHUNKING;
3539 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3540 }
3541 }
3542
3543 /* For messages that have more than the maximum number of envelope recipients,
3544 we want to send several transactions down the same SMTP connection. (See
3545 comments in deliver.c as to how this reconciles, heuristically, with
3546 remote_max_parallel.) This optimization was added to Exim after the following
3547 code was already working. The simplest way to put it in without disturbing the
3548 code was to use a goto to jump back to this point when there is another
3549 transaction to handle. */
3550
3551 SEND_MESSAGE:
3552 sx.from_addr = return_path;
3553 sx.sync_addr = sx.first_addr;
3554 sx.ok = FALSE;
3555 sx.send_rset = TRUE;
3556 sx.completed_addr = FALSE;
3557
3558
3559 /* If we are a continued-connection-after-verify the MAIL and RCPT
3560 commands were already sent; do not re-send but do mark the addrs as
3561 having been accepted up to RCPT stage. A traditional cont-conn
3562 always has a sequence number greater than one. */
3563
3564 if (continue_hostname && continue_sequence == 1)
3565 {
3566 sx.peer_offered = smtp_peer_options;
3567 sx.pending_MAIL = FALSE;
3568 sx.ok = TRUE;
3569 sx.next_addr = NULL;
3570
3571 for (address_item * addr = addrlist; addr; addr = addr->next)
3572 addr->transport_return = PENDING_OK;
3573 }
3574 else
3575 {
3576 /* Initiate a message transfer. */
3577
3578 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3579 {
3580 case 0: break;
3581 case -1: case -2: goto RESPONSE_FAILED;
3582 case -3: goto END_OFF;
3583 case -4: goto SEND_QUIT;
3584 default: goto SEND_FAILED;
3585 }
3586
3587 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3588 permanently or temporarily. We should have flushed and synced after the last
3589 RCPT. */
3590
3591 if (mua_wrapper)
3592 {
3593 address_item * a;
3594 unsigned cnt;
3595
3596 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3597 if (a->transport_return != PENDING_OK)
3598 {
3599 /*XXX could we find a better errno than 0 here? */
3600 set_errno_nohost(addrlist, 0, a->message, FAIL,
3601 testflag(a, af_pass_message));
3602 sx.ok = FALSE;
3603 break;
3604 }
3605 }
3606 }
3607
3608 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3609 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3610 have a good recipient buffered up if we are pipelining. We don't want to waste
3611 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3612 are pipelining. The responses are all handled by sync_responses().
3613 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3614 to send is. */
3615
3616 if ( !(sx.peer_offered & OPTION_CHUNKING)
3617 && (sx.ok || (pipelining_active && !mua_wrapper)))
3618 {
3619 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3620
3621 if (count < 0) goto SEND_FAILED;
3622 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3623 {
3624 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3625 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3626 break;
3627
3628 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3629 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3630 case 0: break; /* No 2xx or 5xx, but no probs */
3631
3632 case -1: goto END_OFF; /* Timeout on RCPT */
3633
3634 #ifdef EXPERIMENTAL_PIPE_CONNECT
3635 case -5: /* TLS first-read error */
3636 case -4: HDEBUG(D_transport)
3637 debug_printf("failed reaping pipelined cmd responses\n");
3638 #endif
3639 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3640 }
3641 pipelining_active = FALSE;
3642 data_command = string_copy(big_buffer); /* Save for later error message */
3643 }
3644
3645 /* If there were no good recipients (but otherwise there have been no
3646 problems), just set ok TRUE, since we have handled address-specific errors
3647 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3648 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3649 well as body. Set the appropriate timeout value to be used for each chunk.
3650 (Haven't been able to make it work using select() for writing yet.) */
3651
3652 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3653 {
3654 /* Save the first address of the next batch. */
3655 sx.first_addr = sx.next_addr;
3656
3657 sx.ok = TRUE;
3658 }
3659 else
3660 {
3661 transport_ctx tctx = {
3662 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3663 .tblock = tblock,
3664 .addr = addrlist,
3665 .check_string = US".",
3666 .escape_string = US"..", /* Escaping strings */
3667 .options =
3668 topt_use_crlf | topt_escape_headers
3669 | (tblock->body_only ? topt_no_headers : 0)
3670 | (tblock->headers_only ? topt_no_body : 0)
3671 | (tblock->return_path_add ? topt_add_return_path : 0)
3672 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3673 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3674 };
3675
3676 /* If using CHUNKING we need a callback from the generic transport
3677 support to us, for the sending of BDAT smtp commands and the reaping
3678 of responses. The callback needs a whole bunch of state so set up
3679 a transport-context structure to be passed around. */
3680
3681 if (sx.peer_offered & OPTION_CHUNKING)
3682 {
3683 tctx.check_string = tctx.escape_string = NULL;
3684 tctx.options |= topt_use_bdat;
3685 tctx.chunk_cb = smtp_chunk_cmd_callback;
3686 sx.pending_BDAT = FALSE;
3687 sx.good_RCPT = sx.ok;
3688 sx.cmd_count = 0;
3689 tctx.smtp_context = &sx;
3690 }
3691 else
3692 tctx.options |= topt_end_dot;
3693
3694 /* Save the first address of the next batch. */
3695 sx.first_addr = sx.next_addr;
3696
3697 /* Responses from CHUNKING commands go in buffer. Otherwise,
3698 there has not been a response. */
3699
3700 sx.buffer[0] = 0;
3701
3702 sigalrm_seen = FALSE;
3703 transport_write_timeout = ob->data_timeout;
3704 smtp_command = US"sending data block"; /* For error messages */
3705 DEBUG(D_transport|D_v)
3706 if (sx.peer_offered & OPTION_CHUNKING)
3707 debug_printf(" will write message using CHUNKING\n");
3708 else
3709 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3710 transport_count = 0;
3711
3712 #ifndef DISABLE_DKIM
3713 dkim_exim_sign_init();
3714 # ifdef EXPERIMENTAL_ARC
3715 {
3716 uschar * s = ob->arc_sign;
3717 if (s)
3718 {
3719 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3720 {
3721 if (!f.expand_string_forcedfail)
3722 {
3723 message = US"failed to expand arc_sign";
3724 sx.ok = FALSE;
3725 goto SEND_FAILED;
3726 }
3727 }
3728 else if (*s)
3729 {
3730 /* Ask dkim code to hash the body for ARC */
3731 (void) arc_ams_setup_sign_bodyhash();
3732 ob->dkim.force_bodyhash = TRUE;
3733 }
3734 }
3735 }
3736 # endif
3737 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3738 #else
3739 sx.ok = transport_write_message(&tctx, 0);
3740 #endif
3741
3742 /* transport_write_message() uses write() because it is called from other
3743 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3744 it can exit with "Broken pipe" as its error. This really means that the
3745 socket got closed at the far end. */
3746
3747 transport_write_timeout = 0; /* for subsequent transports */
3748
3749 /* Failure can either be some kind of I/O disaster (including timeout),
3750 or the failure of a transport filter or the expansion of added headers.
3751 Or, when CHUNKING, it can be a protocol-detected failure. */
3752
3753 if (!sx.ok)
3754 if (message) goto SEND_FAILED;
3755 else goto RESPONSE_FAILED;
3756
3757 /* We used to send the terminating "." explicitly here, but because of
3758 buffering effects at both ends of TCP/IP connections, you don't gain
3759 anything by keeping it separate, so it might as well go in the final
3760 data buffer for efficiency. This is now done by setting the topt_end_dot
3761 flag above. */
3762
3763 smtp_command = US"end of data";
3764
3765 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3766 {
3767 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3768 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3769 {
3770 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3771 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3772 break;
3773
3774 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3775 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3776 case 0: break; /* No 2xx or 5xx, but no probs */
3777
3778 case -1: goto END_OFF; /* Timeout on RCPT */
3779
3780 #ifdef EXPERIMENTAL_PIPE_CONNECT
3781 case -5: /* TLS first-read error */
3782 case -4: HDEBUG(D_transport)
3783 debug_printf("failed reaping pipelined cmd responses\n");
3784 #endif
3785 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3786 }
3787 }
3788
3789 #ifndef DISABLE_PRDR
3790 /* For PRDR we optionally get a partial-responses warning followed by the
3791 individual responses, before going on with the overall response. If we don't
3792 get the warning then deal with per non-PRDR. */
3793
3794 if(sx.prdr_active)
3795 {
3796 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3797 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3798 {
3799 case '2': sx.prdr_active = FALSE;
3800 sx.ok = TRUE;
3801 break;
3802 case '4': errno = ERRNO_DATA4XX;
3803 addrlist->more_errno |=
3804 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3805 break;
3806 }
3807 }
3808 else
3809 #endif
3810
3811 /* For non-PRDR SMTP, we now read a single response that applies to the
3812 whole message. If it is OK, then all the addresses have been delivered. */
3813
3814 if (!sx.lmtp)
3815 {
3816 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3817 ob->final_timeout);
3818 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3819 {
3820 errno = ERRNO_DATA4XX;
3821 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3822 }
3823 }
3824
3825 /* For LMTP, we get back a response for every RCPT command that we sent;
3826 some may be accepted and some rejected. For those that get a response, their
3827 status is fixed; any that are accepted have been handed over, even if later
3828 responses crash - at least, that's how I read RFC 2033.
3829
3830 If all went well, mark the recipient addresses as completed, record which
3831 host/IPaddress they were delivered to, and cut out RSET when sending another
3832 message down the same channel. Write the completed addresses to the journal
3833 now so that they are recorded in case there is a crash of hardware or
3834 software before the spool gets updated. Also record the final SMTP
3835 confirmation if needed (for SMTP only). */
3836
3837 if (sx.ok)
3838 {
3839 int flag = '=';
3840 struct timeval delivery_time;
3841 int len;
3842 uschar * conf = NULL;
3843
3844 timesince(&delivery_time, &start_delivery_time);
3845 sx.send_rset = FALSE;
3846 pipelining_active = FALSE;
3847
3848 /* Set up confirmation if needed - applies only to SMTP */
3849
3850 if (
3851 #ifdef DISABLE_EVENT
3852 LOGGING(smtp_confirmation) &&
3853 #endif
3854 !sx.lmtp
3855 )
3856 {
3857 const uschar *s = string_printing(sx.buffer);
3858 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3859 conf = (s == sx.buffer)? US string_copy(s) : US s;
3860 }
3861
3862 /* Process all transported addresses - for LMTP or PRDR, read a status for
3863 each one. */
3864
3865 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3866 {
3867 if (addr->transport_return != PENDING_OK) continue;
3868
3869 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3870 remaining addresses. Otherwise, it's a return code for just the one
3871 address. For temporary errors, add a retry item for the address so that
3872 it doesn't get tried again too soon. */
3873
3874 #ifndef DISABLE_PRDR
3875 if (sx.lmtp || sx.prdr_active)
3876 #else
3877 if (sx.lmtp)
3878 #endif
3879 {
3880 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3881 ob->final_timeout))
3882 {
3883 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3884 addr->message = string_sprintf(
3885 #ifndef DISABLE_PRDR
3886 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3887 #else
3888 "LMTP error after %s: %s",
3889 #endif
3890 data_command, string_printing(sx.buffer));
3891 setflag(addr, af_pass_message); /* Allow message to go to user */
3892 if (sx.buffer[0] == '5')
3893 addr->transport_return = FAIL;
3894 else
3895 {
3896 errno = ERRNO_DATA4XX;
3897 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3898 addr->transport_return = DEFER;
3899 #ifndef DISABLE_PRDR
3900 if (!sx.prdr_active)
3901 #endif
3902 retry_add_item(addr, addr->address_retry_key, 0);
3903 }
3904 continue;
3905 }
3906 sx.completed_addr = TRUE; /* NOW we can set this flag */
3907 if (LOGGING(smtp_confirmation))
3908 {
3909 const uschar *s = string_printing(sx.buffer);
3910 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3911 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3912 }
3913 }
3914
3915 /* SMTP, or success return from LMTP for this address. Pass back the
3916 actual host that was used. */
3917
3918 addr->transport_return = OK;
3919 addr->more_errno = delivery_time.tv_sec;
3920 addr->delivery_usec = delivery_time.tv_usec;
3921 addr->host_used = host;
3922 addr->special_action = flag;
3923 addr->message = conf;
3924
3925 if (tcp_out_fastopen)
3926 {
3927 setflag(addr, af_tcp_fastopen_conn);
3928 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3929 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3930 }
3931 if (sx.pipelining_used) setflag(addr, af_pipelining);
3932 #ifdef EXPERIMENTAL_PIPE_CONNECT
3933 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3934 #endif
3935 #ifndef DISABLE_PRDR
3936 if (sx.prdr_active) setflag(addr, af_prdr_used);
3937 #endif
3938 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3939 flag = '-';
3940
3941 #ifndef DISABLE_PRDR
3942 if (!sx.prdr_active)
3943 #endif
3944 {
3945 /* Update the journal. For homonymic addresses, use the base address plus
3946 the transport name. See lots of comments in deliver.c about the reasons
3947 for the complications when homonyms are involved. Just carry on after
3948 write error, as it may prove possible to update the spool file later. */
3949
3950 if (testflag(addr, af_homonym))
3951 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3952 else
3953 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3954
3955 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3956 len = Ustrlen(CS sx.buffer);
3957 if (write(journal_fd, sx.buffer, len) != len)
3958 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3959 "%s: %s", sx.buffer, strerror(errno));
3960 }
3961 }
3962
3963 #ifndef DISABLE_PRDR
3964 if (sx.prdr_active)
3965 {
3966 const uschar * overall_message;
3967
3968 /* PRDR - get the final, overall response. For any non-success
3969 upgrade all the address statuses. */
3970
3971 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3972 ob->final_timeout);
3973 if (!sx.ok)
3974 {
3975 if(errno == 0 && sx.buffer[0] == '4')
3976 {
3977 errno = ERRNO_DATA4XX;
3978 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3979 }
3980 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3981 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3982 addr->transport_return = PENDING_OK; /* allow set_errno action */
3983 goto RESPONSE_FAILED;
3984 }
3985
3986 /* Append the overall response to the individual PRDR response for logging
3987 and update the journal, or setup retry. */
3988
3989 overall_message = string_printing(sx.buffer);
3990 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3991 if (addr->transport_return == OK)
3992 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3993
3994 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3995 if (addr->transport_return == OK)
3996 {
3997 if (testflag(addr, af_homonym))
3998 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3999 else
4000 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4001
4002 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
4003 len = Ustrlen(CS sx.buffer);
4004 if (write(journal_fd, sx.buffer, len) != len)
4005 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4006 "%s: %s", sx.buffer, strerror(errno));
4007 }
4008 else if (addr->transport_return == DEFER)
4009 retry_add_item(addr, addr->address_retry_key, -2);
4010 }
4011 #endif
4012
4013 /* Ensure the journal file is pushed out to disk. */
4014
4015 if (EXIMfsync(journal_fd) < 0)
4016 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4017 strerror(errno));
4018 }
4019 }
4020
4021
4022 /* Handle general (not specific to one address) failures here. The value of ok
4023 is used to skip over this code on the falling through case. A timeout causes a
4024 deferral. Other errors may defer or fail according to the response code, and
4025 may set up a special errno value, e.g. after connection chopped, which is
4026 assumed if errno == 0 and there is no text in the buffer. If control reaches
4027 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4028 the problem is not related to this specific message. */
4029
4030 if (!sx.ok)
4031 {
4032 int code, set_rc;
4033 uschar * set_message;
4034
4035 RESPONSE_FAILED:
4036 {
4037 save_errno = errno;
4038 message = NULL;
4039 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4040 sx.buffer, &code, &message, &pass_message);
4041 goto FAILED;
4042 }
4043
4044 SEND_FAILED:
4045 {
4046 save_errno = errno;
4047 code = '4';
4048 message = string_sprintf("send() to %s [%s] failed: %s",
4049 host->name, host->address, message ? message : US strerror(save_errno));
4050 sx.send_quit = FALSE;
4051 goto FAILED;
4052 }
4053
4054 FAILED:
4055 {
4056 BOOL message_error;
4057
4058 sx.ok = FALSE; /* For when reached by GOTO */
4059 set_message = message;
4060
4061 /* We want to handle timeouts after MAIL or "." and loss of connection after
4062 "." specially. They can indicate a problem with the sender address or with
4063 the contents of the message rather than a real error on the connection. These
4064 cases are treated in the same way as a 4xx response. This next bit of code
4065 does the classification. */
4066
4067 switch(save_errno)
4068 {
4069 case 0:
4070 case ERRNO_MAIL4XX:
4071 case ERRNO_DATA4XX:
4072 message_error = TRUE;
4073 break;
4074
4075 case ETIMEDOUT:
4076 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4077 Ustrncmp(smtp_command,"end ",4) == 0;
4078 break;
4079
4080 case ERRNO_SMTPCLOSED:
4081 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4082 break;
4083
4084 default:
4085 message_error = FALSE;
4086 break;
4087 }
4088
4089 /* Handle the cases that are treated as message errors. These are:
4090
4091 (a) negative response or timeout after MAIL
4092 (b) negative response after DATA
4093 (c) negative response or timeout or dropped connection after "."
4094 (d) utf8 support required and not offered
4095
4096 It won't be a negative response or timeout after RCPT, as that is dealt
4097 with separately above. The action in all cases is to set an appropriate
4098 error code for all the addresses, but to leave yield set to OK because the
4099 host itself has not failed. Of course, it might in practice have failed
4100 when we've had a timeout, but if so, we'll discover that at the next
4101 delivery attempt. For a temporary error, set the message_defer flag, and
4102 write to the logs for information if this is not the last host. The error
4103 for the last host will be logged as part of the address's log line. */
4104
4105 if (message_error)
4106 {
4107 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4108
4109 /* If there's an errno, the message contains just the identity of
4110 the host. */
4111
4112 if (code == '5')
4113 set_rc = FAIL;
4114 else /* Anything other than 5 is treated as temporary */
4115 {
4116 set_rc = DEFER;
4117 if (save_errno > 0)
4118 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4119
4120 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4121
4122 *message_defer = TRUE;
4123 }
4124 }
4125
4126 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4127 ".", or some other transportation error. We defer all addresses and yield
4128 DEFER, except for the case of failed add_headers expansion, or a transport
4129 filter failure, when the yield should be ERROR, to stop it trying other
4130 hosts. */
4131
4132 else
4133 {
4134 #ifdef EXPERIMENTAL_PIPE_CONNECT
4135 /* If we were early-pipelinng and the actual EHLO response did not match
4136 the cached value we assumed, we could have detected it and passed a
4137 custom errno through to here. It would be nice to RSET and retry right
4138 away, but to reliably do that we eould need an extra synch point before
4139 we committed to data and that would discard half the gained roundrips.
4140 Or we could summarily drop the TCP connection. but that is also ugly.
4141 Instead, we ignore the possibility (having freshened the cache) and rely
4142 on the server telling us with a nonmessage error if we have tried to
4143 do something it no longer supports. */
4144 #endif
4145 set_rc = DEFER;
4146 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4147 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4148 }
4149 }
4150
4151 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4152 #ifdef EXPERIMENTAL_DSN_INFO
4153 , sx.smtp_greeting, sx.helo_response
4154 #endif
4155 );
4156 }
4157
4158
4159 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4160 SMTP session tidily. However, if there were too many addresses to send in one
4161 message (indicated by first_addr being non-NULL) we want to carry on with the
4162 rest of them. Also, it is desirable to send more than one message down the SMTP
4163 connection if there are several waiting, provided we haven't already sent so
4164 many as to hit the configured limit. The function transport_check_waiting looks
4165 for a waiting message and returns its id. Then transport_pass_socket tries to
4166 set up a continued delivery by passing the socket on to another process. The
4167 variable send_rset is FALSE if a message has just been successfully transferred.
4168
4169 If we are already sending down a continued channel, there may be further
4170 addresses not yet delivered that are aimed at the same host, but which have not
4171 been passed in this run of the transport. In this case, continue_more will be
4172 true, and all we should do is send RSET if necessary, and return, leaving the
4173 channel open.
4174
4175 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4176 do not want to continue with other messages down the same channel, because that
4177 can lead to looping between two or more messages, all with the same,
4178 temporarily failing address(es). [The retry information isn't updated yet, so
4179 new processes keep on trying.] We probably also don't want to try more of this
4180 message's addresses either.
4181
4182 If we have started a TLS session, we have to end it before passing the
4183 connection to a new process. However, not all servers can handle this (Exim
4184 can), so we do not pass such a connection on if the host matches
4185 hosts_nopass_tls. */
4186
4187 DEBUG(D_transport)
4188 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4189 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4190 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4191
4192 if (sx.completed_addr && sx.ok && sx.send_quit)
4193 {
4194 BOOL more;
4195 smtp_compare_t t_compare;
4196
4197 t_compare.tblock = tblock;
4198 t_compare.current_sender_address = sender_address;
4199
4200 if ( sx.first_addr != NULL
4201 || f.continue_more
4202 || (
4203 #ifdef SUPPORT_TLS
4204 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4205 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4206 )
4207 &&
4208 #endif
4209 transport_check_waiting(tblock->name, host->name,
4210 tblock->connection_max_messages, new_message_id, &more,
4211 (oicf)smtp_are_same_identities, (void*)&t_compare)
4212 ) )
4213 {
4214 uschar *msg;
4215 BOOL pass_message;
4216
4217 if (sx.send_rset)
4218 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4219 {
4220 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4221 host->address, strerror(errno));
4222 sx.send_quit = FALSE;
4223 }
4224 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4225 '2', ob->command_timeout)))
4226 {
4227 int code;
4228 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4229 &pass_message);
4230 if (!sx.send_quit)
4231 {
4232 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4233 host->name, host->address, msg);
4234 }
4235 }
4236
4237 /* Either RSET was not needed, or it succeeded */
4238
4239 if (sx.ok)
4240 {
4241 #ifdef SUPPORT_TLS
4242 int pfd[2];
4243 #endif
4244 int socket_fd = sx.cctx.sock;
4245
4246
4247 if (sx.first_addr != NULL) /* More addresses still to be sent */
4248 { /* in this run of the transport */
4249 continue_sequence++; /* Causes * in logging */
4250 goto SEND_MESSAGE;
4251 }
4252
4253 /* Unless caller said it already has more messages listed for this host,
4254 pass the connection on to a new Exim process (below, the call to
4255 transport_pass_socket). If the caller has more ready, just return with
4256 the connection still open. */
4257
4258 #ifdef SUPPORT_TLS
4259 if (tls_out.active.sock >= 0)
4260 if ( f.continue_more
4261 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4262 {
4263 /* Before passing the socket on, or returning to caller with it still
4264 open, we must shut down TLS. Not all MTAs allow for the continuation
4265 of the SMTP session when TLS is shut down. We test for this by sending
4266 a new EHLO. If we don't get a good response, we don't attempt to pass
4267 the socket on. */
4268
4269 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4270 sx.cctx.tls_ctx = NULL;
4271 smtp_peer_options = smtp_peer_options_wrap;
4272 sx.ok = !sx.smtps
4273 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4274 >= 0
4275 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4276 '2', ob->command_timeout);
4277
4278 if (sx.ok && f.continue_more)
4279 return yield; /* More addresses for another run */
4280 }
4281 else
4282 {
4283 /* Set up a pipe for proxying TLS for the new transport process */
4284
4285 smtp_peer_options |= OPTION_TLS;
4286 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4287 socket_fd = pfd[1];
4288 else
4289 set_errno(sx.first_addr, errno, US"internal allocation problem",
4290 DEFER, FALSE, host
4291 # ifdef EXPERIMENTAL_DSN_INFO
4292 , sx.smtp_greeting, sx.helo_response
4293 # endif
4294 );
4295 }
4296 else
4297 #endif
4298 if (f.continue_more)
4299 return yield; /* More addresses for another run */
4300
4301 /* If the socket is successfully passed, we mustn't send QUIT (or
4302 indeed anything!) from here. */
4303
4304 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4305 propagate it from the initial
4306 */
4307 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4308 host->address, new_message_id, socket_fd))
4309 {
4310 sx.send_quit = FALSE;
4311
4312 /* We have passed the client socket to a fresh transport process.
4313 If TLS is still active, we need to proxy it for the transport we
4314 just passed the baton to. Fork a child to to do it, and return to
4315 get logging done asap. Which way to place the work makes assumptions
4316 about post-fork prioritisation which may not hold on all platforms. */
4317 #ifdef SUPPORT_TLS
4318 if (tls_out.active.sock >= 0)
4319 {
4320 int pid = fork();
4321 if (pid == 0) /* child; fork again to disconnect totally */
4322 {
4323 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4324 /* does not return */
4325 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4326 ob->command_timeout);
4327 }
4328
4329 if (pid > 0) /* parent */
4330 {
4331 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4332 close(pfd[0]);
4333 /* tidy the inter-proc to disconn the proxy proc */
4334 waitpid(pid, NULL, 0);
4335 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4336 sx.cctx.tls_ctx = NULL;
4337 (void)close(sx.cctx.sock);
4338 sx.cctx.sock = -1;
4339 continue_transport = NULL;
4340 continue_hostname = NULL;
4341 return yield;
4342 }
4343 log_write(0, LOG_PANIC_DIE, "fork failed");
4344 }
4345 #endif
4346 }
4347 }
4348
4349 /* If RSET failed and there are addresses left, they get deferred. */
4350 else
4351 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4352 #ifdef EXPERIMENTAL_DSN_INFO
4353 , sx.smtp_greeting, sx.helo_response
4354 #endif
4355 );
4356 }
4357 }
4358
4359 /* End off tidily with QUIT unless the connection has died or the socket has
4360 been passed to another process. There has been discussion on the net about what
4361 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4362 to wait for a response, but on the other hand, there isn't anything one can do
4363 with an error response, other than log it. Exim used to do that. However,
4364 further discussion suggested that it is positively advantageous not to wait for
4365 the response, but to close the session immediately. This is supposed to move
4366 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4367 load from the server. (Hosts that are both servers and clients may not see much
4368 difference, of course.) Further discussion indicated that this was safe to do
4369 on Unix systems which have decent implementations of TCP/IP that leave the
4370 connection around for a while (TIME_WAIT) after the application has gone away.
4371 This enables the response sent by the server to be properly ACKed rather than
4372 timed out, as can happen on broken TCP/IP implementations on other OS.
4373
4374 This change is being made on 31-Jul-98. After over a year of trouble-free
4375 operation, the old commented-out code was removed on 17-Sep-99. */
4376
4377 SEND_QUIT:
4378 #ifdef TCP_CORK
4379 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4380 #endif
4381 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4382
4383 END_OFF:
4384
4385 #ifdef SUPPORT_TLS
4386 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4387 sx.cctx.tls_ctx = NULL;
4388 #endif
4389
4390 /* Close the socket, and return the appropriate value, first setting
4391 works because the NULL setting is passed back to the calling process, and
4392 remote_max_parallel is forced to 1 when delivering over an existing connection,
4393
4394 If all went well and continue_more is set, we shouldn't actually get here if
4395 there are further addresses, as the return above will be taken. However,
4396 writing RSET might have failed, or there may be other addresses whose hosts are
4397 specified in the transports, and therefore not visible at top level, in which
4398 case continue_more won't get set. */
4399
4400 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4401 if (sx.send_quit)
4402 {
4403 shutdown(sx.cctx.sock, SHUT_WR);
4404 millisleep(f.running_in_test_harness ? 200 : 20);
4405 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4406 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4407 i--; /* drain socket */
4408 }
4409 (void)close(sx.cctx.sock);
4410
4411 #ifndef DISABLE_EVENT
4412 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4413 #endif
4414
4415 continue_transport = NULL;
4416 continue_hostname = NULL;
4417 return yield;
4418 }
4419
4420
4421
4422
4423 /*************************************************
4424 * Closedown entry point *
4425 *************************************************/
4426
4427 /* This function is called when exim is passed an open smtp channel
4428 from another incarnation, but the message which it has been asked
4429 to deliver no longer exists. The channel is on stdin.
4430
4431 We might do fancy things like looking for another message to send down
4432 the channel, but if the one we sought has gone, it has probably been
4433 delivered by some other process that itself will seek further messages,
4434 so just close down our connection.
4435
4436 Argument: pointer to the transport instance block
4437 Returns: nothing
4438 */
4439
4440 void
4441 smtp_transport_closedown(transport_instance *tblock)
4442 {
4443 smtp_transport_options_block * ob = SOB tblock->options_block;
4444 client_conn_ctx cctx;
4445 smtp_context sx;
4446 uschar buffer[256];
4447 uschar inbuffer[4096];
4448 uschar outbuffer[16];
4449
4450 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4451 cctx.sock = fileno(stdin);
4452 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4453
4454 sx.inblock.cctx = &cctx;
4455 sx.inblock.buffer = inbuffer;
4456 sx.inblock.buffersize = sizeof(inbuffer);
4457 sx.inblock.ptr = inbuffer;
4458 sx.inblock.ptrend = inbuffer;
4459
4460 sx.outblock.cctx = &cctx;
4461 sx.outblock.buffersize = sizeof(outbuffer);
4462 sx.outblock.buffer = outbuffer;
4463 sx.outblock.ptr = outbuffer;
4464 sx.outblock.cmd_count = 0;
4465 sx.outblock.authenticating = FALSE;
4466
4467 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4468 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4469 (void)close(cctx.sock);
4470 }
4471
4472
4473
4474 /*************************************************
4475 * Prepare addresses for delivery *
4476 *************************************************/
4477
4478 /* This function is called to flush out error settings from previous delivery
4479 attempts to other hosts. It also records whether we got here via an MX record
4480 or not in the more_errno field of the address. We are interested only in
4481 addresses that are still marked DEFER - others may have got delivered to a
4482 previously considered IP address. Set their status to PENDING_DEFER to indicate
4483 which ones are relevant this time.
4484
4485 Arguments:
4486 addrlist the list of addresses
4487 host the host we are delivering to
4488
4489 Returns: the first address for this delivery
4490 */
4491
4492 static address_item *
4493 prepare_addresses(address_item *addrlist, host_item *host)
4494 {
4495 address_item *first_addr = NULL;
4496 for (address_item * addr = addrlist; addr; addr = addr->next)
4497 if (addr->transport_return == DEFER)
4498 {
4499 if (!first_addr) first_addr = addr;
4500 addr->transport_return = PENDING_DEFER;
4501 addr->basic_errno = 0;
4502 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4503 addr->message = NULL;
4504 #ifdef SUPPORT_TLS
4505 addr->cipher = NULL;
4506 addr->ourcert = NULL;
4507 addr->peercert = NULL;
4508 addr->peerdn = NULL;
4509 addr->ocsp = OCSP_NOT_REQ;
4510 #endif
4511 #ifdef EXPERIMENTAL_DSN_INFO
4512 addr->smtp_greeting = NULL;
4513 addr->helo_response = NULL;
4514 #endif
4515 }
4516 return first_addr;
4517 }
4518
4519
4520
4521 /*************************************************
4522 * Main entry point *
4523 *************************************************/
4524
4525 /* See local README for interface details. As this is a remote transport, it is
4526 given a chain of addresses to be delivered in one connection, if possible. It
4527 always returns TRUE, indicating that each address has its own independent
4528 status set, except if there is a setting up problem, in which case it returns
4529 FALSE. */
4530
4531 BOOL
4532 smtp_transport_entry(
4533 transport_instance *tblock, /* data for this instantiation */
4534 address_item *addrlist) /* addresses we are working on */
4535 {
4536 int defport;
4537 int hosts_defer = 0;
4538 int hosts_fail = 0;
4539 int hosts_looked_up = 0;
4540 int hosts_retry = 0;
4541 int hosts_serial = 0;
4542 int hosts_total = 0;
4543 int total_hosts_tried = 0;
4544 BOOL expired = TRUE;
4545 uschar *expanded_hosts = NULL;
4546 uschar *pistring;
4547 uschar *tid = string_sprintf("%s transport", tblock->name);
4548 smtp_transport_options_block *ob = SOB tblock->options_block;
4549 host_item *hostlist = addrlist->host_list;
4550 host_item *host = NULL;
4551
4552 DEBUG(D_transport)
4553 {
4554 debug_printf("%s transport entered\n", tblock->name);
4555 for (address_item * addr = addrlist; addr; addr = addr->next)
4556 debug_printf(" %s\n", addr->address);
4557 if (hostlist)
4558 {
4559 debug_printf("hostlist:\n");
4560 for (host_item * host = hostlist; host; host = host->next)
4561 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4562 }
4563 if (continue_hostname)
4564 debug_printf("already connected to %s [%s] (on fd %d)\n",
4565 continue_hostname, continue_host_address,
4566 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4567 }
4568
4569 /* Set the flag requesting that these hosts be added to the waiting
4570 database if the delivery fails temporarily or if we are running with
4571 queue_smtp or a 2-stage queue run. This gets unset for certain
4572 kinds of error, typically those that are specific to the message. */
4573
4574 update_waiting = TRUE;
4575
4576 /* If a host list is not defined for the addresses - they must all have the
4577 same one in order to be passed to a single transport - or if the transport has
4578 a host list with hosts_override set, use the host list supplied with the
4579 transport. It is an error for this not to exist. */
4580
4581 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
4582 if (tls_requiretls & REQUIRETLS_MSG)
4583 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
4584 rather than modifying the transport? */
4585 #endif
4586
4587 if (!hostlist || (ob->hosts_override && ob->hosts))
4588 {
4589 if (!ob->hosts)
4590 {
4591 addrlist->message = string_sprintf("%s transport called with no hosts set",
4592 tblock->name);
4593 addrlist->transport_return = PANIC;
4594 return FALSE; /* Only top address has status */
4595 }
4596
4597 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4598 ob->hosts);
4599
4600 /* If the transport's host list contains no '$' characters, and we are not
4601 randomizing, it is fixed and therefore a chain of hosts can be built once
4602 and for all, and remembered for subsequent use by other calls to this
4603 transport. If, on the other hand, the host list does contain '$', or we are
4604 randomizing its order, we have to rebuild it each time. In the fixed case,
4605 as the hosts string will never be used again, it doesn't matter that we
4606 replace all the : characters with zeros. */
4607
4608 if (!ob->hostlist)
4609 {
4610 uschar *s = ob->hosts;
4611
4612 if (Ustrchr(s, '$') != NULL)
4613 {
4614 if (!(expanded_hosts = expand_string(s)))
4615 {
4616 addrlist->message = string_sprintf("failed to expand list of hosts "
4617 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4618 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4619 return FALSE; /* Only top address has status */
4620 }
4621 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4622 "\"%s\"\n", s, expanded_hosts);
4623 s = expanded_hosts;
4624 }
4625 else
4626 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4627
4628 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4629
4630 /* Check that the expansion yielded something useful. */
4631 if (!hostlist)
4632 {
4633 addrlist->message =
4634 string_sprintf("%s transport has empty hosts setting", tblock->name);
4635 addrlist->transport_return = PANIC;
4636 return FALSE; /* Only top address has status */
4637 }
4638
4639 /* If there was no expansion of hosts, save the host list for
4640 next time. */
4641
4642 if (!expanded_hosts) ob->hostlist = hostlist;
4643 }
4644
4645 /* This is not the first time this transport has been run in this delivery;
4646 the host list was built previously. */
4647
4648 else
4649 hostlist = ob->hostlist;
4650 }
4651
4652 /* The host list was supplied with the address. If hosts_randomize is set, we
4653 must sort it into a random order if it did not come from MX records and has not
4654 already been randomized (but don't bother if continuing down an existing
4655 connection). */
4656
4657 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4658 {
4659 host_item *newlist = NULL;
4660 while (hostlist)
4661 {
4662 host_item *h = hostlist;
4663 hostlist = hostlist->next;
4664
4665 h->sort_key = random_number(100);
4666
4667 if (!newlist)
4668 {
4669 h->next = NULL;
4670 newlist = h;
4671 }
4672 else if (h->sort_key < newlist->sort_key)
4673 {
4674 h->next = newlist;
4675 newlist = h;
4676 }
4677 else
4678 {
4679 host_item *hh = newlist;
4680 while (hh->next)
4681 {
4682 if (h->sort_key < hh->next->sort_key) break;
4683 hh = hh->next;
4684 }
4685 h->next = hh->next;
4686 hh->next = h;
4687 }
4688 }
4689
4690 hostlist = addrlist->host_list = newlist;
4691 }
4692
4693 /* Sort out the default port. */
4694
4695 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4696
4697 /* For each host-plus-IP-address on the list:
4698
4699 . If this is a continued delivery and the host isn't the one with the
4700 current connection, skip.
4701
4702 . If the status is unusable (i.e. previously failed or retry checked), skip.
4703
4704 . If no IP address set, get the address, either by turning the name into
4705 an address, calling gethostbyname if gethostbyname is on, or by calling
4706 the DNS. The DNS may yield multiple addresses, in which case insert the
4707 extra ones into the list.
4708
4709 . Get the retry data if not previously obtained for this address and set the
4710 field which remembers the state of this address. Skip if the retry time is
4711 not reached. If not, remember whether retry data was found. The retry string
4712 contains both the name and the IP address.
4713
4714 . Scan the list of addresses and mark those whose status is DEFER as
4715 PENDING_DEFER. These are the only ones that will be processed in this cycle
4716 of the hosts loop.
4717
4718 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4719 Some addresses may be successfully delivered, others may fail, and yet
4720 others may get temporary errors and so get marked DEFER.
4721
4722 . The return from the delivery attempt is OK if a connection was made and a
4723 valid SMTP dialogue was completed. Otherwise it is DEFER.
4724
4725 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4726
4727 . If fail to connect, or other defer state, add a retry item.
4728
4729 . If there are any addresses whose status is still DEFER, carry on to the
4730 next host/IPaddress, unless we have tried the number of hosts given
4731 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4732 there is some fancy logic for hosts_max_try that means its limit can be
4733 overstepped in some circumstances.
4734
4735 If we get to the end of the list, all hosts have deferred at least one address,
4736 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4737 delivery attempt to those hosts whose last try was before the arrival time of
4738 the current message. To cope with this, we have to go round the loop a second
4739 time. After that, set the status and error data for any addresses that haven't
4740 had it set already. */
4741
4742 for (int cutoff_retry = 0;
4743 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4744 cutoff_retry++)
4745 {
4746 host_item *nexthost = NULL;
4747 int unexpired_hosts_tried = 0;
4748 BOOL continue_host_tried = FALSE;
4749
4750 retry_non_continued:
4751 for (host = hostlist;
4752 host
4753 && unexpired_hosts_tried < ob->hosts_max_try
4754 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4755 host = nexthost)
4756 {
4757 int rc;
4758 int host_af;
4759 BOOL host_is_expired = FALSE;
4760 BOOL message_defer = FALSE;
4761 BOOL some_deferred = FALSE;
4762 address_item *first_addr = NULL;
4763 uschar *interface = NULL;
4764 uschar *retry_host_key = NULL;
4765 uschar *retry_message_key = NULL;
4766 uschar *serialize_key = NULL;
4767
4768 /* Default next host is next host. :-) But this can vary if the
4769 hosts_max_try limit is hit (see below). It may also be reset if a host
4770 address is looked up here (in case the host was multihomed). */
4771
4772 nexthost = host->next;
4773
4774 /* If the address hasn't yet been obtained from the host name, look it up
4775 now, unless the host is already marked as unusable. If it is marked as
4776 unusable, it means that the router was unable to find its IP address (in
4777 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4778 the lookup failed last time. We don't get this far if *all* MX records
4779 point to non-existent hosts; that is treated as a hard error.
4780
4781 We can just skip this host entirely. When the hosts came from the router,
4782 the address will timeout based on the other host(s); when the address is
4783 looked up below, there is an explicit retry record added.
4784
4785 Note that we mustn't skip unusable hosts if the address is not unset; they
4786 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4787
4788 if (!host->address)
4789 {
4790 int new_port, flags;
4791
4792 if (host->status >= hstatus_unusable)
4793 {
4794 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4795 host->name);
4796 continue;
4797 }
4798
4799 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4800
4801 /* The host name is permitted to have an attached port. Find it, and
4802 strip it from the name. Just remember it for now. */
4803
4804 new_port = host_item_get_port(host);
4805
4806 /* Count hosts looked up */
4807
4808 hosts_looked_up++;
4809
4810 /* Find by name if so configured, or if it's an IP address. We don't
4811 just copy the IP address, because we need the test-for-local to happen. */
4812
4813 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4814 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4815 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4816
4817 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4818 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4819 else
4820 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4821 &ob->dnssec, /* domains for request/require */
4822 NULL, NULL);
4823
4824 /* Update the host (and any additional blocks, resulting from
4825 multihoming) with a host-specific port, if any. */
4826
4827 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4828
4829 /* Failure to find the host at this time (usually DNS temporary failure)
4830 is really a kind of routing failure rather than a transport failure.
4831 Therefore we add a retry item of the routing kind, not to stop us trying
4832 to look this name up here again, but to ensure the address gets timed
4833 out if the failures go on long enough. A complete failure at this point
4834 commonly points to a configuration error, but the best action is still
4835 to carry on for the next host. */
4836
4837 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4838 {
4839 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4840 expired = FALSE;
4841 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4842 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4843 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4844 host->status = hstatus_unusable;
4845
4846 for (address_item * addr = addrlist; addr; addr = addr->next)
4847 {
4848 if (addr->transport_return != DEFER) continue;
4849 addr->basic_errno = ERRNO_UNKNOWNHOST;
4850 addr->message = string_sprintf(
4851 rc == HOST_FIND_SECURITY
4852 ? "lookup of IP address for %s was insecure"
4853 : "failed to lookup IP address for %s",
4854 host->name);
4855 }
4856 continue;
4857 }
4858
4859 /* If the host is actually the local host, we may have a problem, or
4860 there may be some cunning configuration going on. In the problem case,
4861 log things and give up. The default transport status is already DEFER. */
4862
4863 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4864 {
4865 for (address_item * addr = addrlist; addr; addr = addr->next)
4866 {
4867 addr->basic_errno = 0;
4868 addr->message = string_sprintf("%s transport found host %s to be "
4869 "local", tblock->name, host->name);
4870 }
4871 goto END_TRANSPORT;
4872 }
4873 } /* End of block for IP address lookup */
4874
4875 /* If this is a continued delivery, we are interested only in the host
4876 which matches the name of the existing open channel. The check is put
4877 here after the local host lookup, in case the name gets expanded as a
4878 result of the lookup. Set expired FALSE, to save the outer loop executing
4879 twice. */
4880
4881 if (continue_hostname)
4882 if ( Ustrcmp(continue_hostname, host->name) != 0
4883 || Ustrcmp(continue_host_address, host->address) != 0
4884 )
4885 {
4886 expired = FALSE;
4887 continue; /* With next host */
4888 }
4889 else
4890 continue_host_tried = TRUE;
4891
4892 /* Reset the default next host in case a multihomed host whose addresses
4893 are not looked up till just above added to the host list. */
4894
4895 nexthost = host->next;
4896
4897 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4898 domain is in queue_smtp_domains, we don't actually want to attempt any
4899 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4900 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4901 were not in it. We don't want to hold up all SMTP deliveries! Except when
4902 doing a two-stage queue run, don't do this if forcing. */
4903
4904 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4905 match_isinlist(addrlist->domain,
4906 (const uschar **)&queue_smtp_domains, 0,
4907 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4908 {
4909 expired = FALSE;
4910 for (address_item * addr = addrlist; addr; addr = addr->next)
4911 if (addr->transport_return == DEFER)
4912 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4913 continue; /* With next host */
4914 }
4915
4916 /* Count hosts being considered - purely for an intelligent comment
4917 if none are usable. */
4918
4919 hosts_total++;
4920
4921 /* Set $host and $host address now in case they are needed for the
4922 interface expansion or the serialize_hosts check; they remain set if an
4923 actual delivery happens. */
4924
4925 deliver_host = host->name;
4926 deliver_host_address = host->address;
4927 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4928 : host->dnssec == DS_NO ? US"no"
4929 : US"";
4930
4931 /* Set up a string for adding to the retry key if the port number is not
4932 the standard SMTP port. A host may have its own port setting that overrides
4933 the default. */
4934
4935 pistring = string_sprintf(":%d", host->port == PORT_NONE
4936 ? defport : host->port);
4937 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4938
4939 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4940 string is set, even if constant (as different transports can have different
4941 constant settings), we must add it to the key that is used for retries,
4942 because connections to the same host from a different interface should be
4943 treated separately. */
4944
4945 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4946 {
4947 uschar * s = ob->interface;
4948 if (s && *s)
4949 {
4950 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4951 return FALSE;
4952 pistring = string_sprintf("%s/%s", pistring, interface);
4953 }
4954 }
4955
4956 /* The first time round the outer loop, check the status of the host by
4957 inspecting the retry data. The second time round, we are interested only
4958 in expired hosts that haven't been tried since this message arrived. */
4959
4960 if (cutoff_retry == 0)
4961 {
4962 BOOL incl_ip;
4963 /* Ensure the status of the address is set by checking retry data if
4964 necessary. There may be host-specific retry data (applicable to all
4965 messages) and also data for retries of a specific message at this host.
4966 If either of these retry records are actually read, the keys used are
4967 returned to save recomputing them later. */
4968
4969 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4970 US"retry_include_ip_address", ob->retry_include_ip_address,
4971 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4972 continue; /* with next host */
4973
4974 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4975 incl_ip, &retry_host_key, &retry_message_key);
4976
4977 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4978 host->address ? host->address : US"", pistring,
4979 host->status == hstatus_usable ? "usable"
4980 : host->status == hstatus_unusable ? "unusable"
4981 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4982
4983 /* Skip this address if not usable at this time, noting if it wasn't
4984 actually expired, both locally and in the address. */
4985
4986 switch (host->status)
4987 {
4988 case hstatus_unusable:
4989 expired = FALSE;
4990 setflag(addrlist, af_retry_skipped);
4991 /* Fall through */
4992
4993 case hstatus_unusable_expired:
4994 switch (host->why)
4995 {
4996 case hwhy_retry: hosts_retry++; break;
4997 case hwhy_failed: hosts_fail++; break;
4998 case hwhy_insecure:
4999 case hwhy_deferred: hosts_defer++; break;
5000 }
5001
5002 /* If there was a retry message key, implying that previously there
5003 was a message-specific defer, we don't want to update the list of
5004 messages waiting for these hosts. */
5005
5006 if (retry_message_key) update_waiting = FALSE;
5007 continue; /* With the next host or IP address */
5008 }
5009 }
5010
5011 /* Second time round the loop: if the address is set but expired, and
5012 the message is newer than the last try, let it through. */
5013
5014 else
5015 {
5016 if ( !host->address
5017 || host->status != hstatus_unusable_expired
5018 || host->last_try > received_time.tv_sec)
5019 continue;
5020 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5021 host->name, host->address, pistring);
5022 host_is_expired = TRUE;
5023 }
5024
5025 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5026 it remains TRUE only if all hosts are expired and none are actually tried.
5027 */
5028
5029 expired = FALSE;
5030
5031 /* If this host is listed as one to which access must be serialized,
5032 see if another Exim process has a connection to it, and if so, skip
5033 this host. If not, update the database to record our connection to it
5034 and remember this for later deletion. Do not do any of this if we are
5035 sending the message down a pre-existing connection. */
5036
5037 if ( !continue_hostname
5038 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5039 {
5040 serialize_key = string_sprintf("host-serialize-%s", host->name);
5041 if (!enq_start(serialize_key, 1))
5042 {
5043 DEBUG(D_transport)
5044 debug_printf("skipping host %s because another Exim process "
5045 "is connected to it\n", host->name);
5046 hosts_serial++;
5047 continue;
5048 }
5049 }
5050
5051 /* OK, we have an IP address that is not waiting for its retry time to
5052 arrive (it might be expired) OR (second time round the loop) we have an
5053 expired host that hasn't been tried since the message arrived. Have a go
5054 at delivering the message to it. First prepare the addresses by flushing
5055 out the result of previous attempts, and finding the first address that
5056 is still to be delivered. */
5057
5058 first_addr = prepare_addresses(addrlist, host);
5059
5060 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5061 message_id, host->name, host->address, addrlist->address,
5062 addrlist->next ? ", ..." : "");
5063
5064 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5065 message_id, host->name, host->address, pistring, addrlist->address,
5066 addrlist->next ? ", ..." : "");
5067
5068 /* This is not for real; don't do the delivery. If there are
5069 any remaining hosts, list them. */
5070
5071 if (f.dont_deliver)
5072 {
5073 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5074 for (address_item * addr = addrlist; addr; addr = addr->next)
5075 {
5076 addr->host_used = host;
5077 addr->special_action = '*';
5078 addr->message = US"delivery bypassed by -N option";
5079 }
5080 DEBUG(D_transport)
5081 {
5082 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5083 "*** host and remaining hosts:\n", tblock->name);
5084 for (host_item * host2 = host; host2; host2 = host2->next)
5085 debug_printf(" %s [%s]\n", host2->name,
5086 host2->address ? host2->address : US"unset");
5087 }
5088 rc = OK;
5089 }
5090
5091 /* This is for real. If the host is expired, we don't count it for
5092 hosts_max_retry. This ensures that all hosts must expire before an address
5093 is timed out, unless hosts_max_try_hardlimit (which protects against
5094 lunatic DNS configurations) is reached.
5095
5096 If the host is not expired and we are about to hit the hosts_max_retry
5097 limit, check to see if there is a subsequent hosts with a different MX
5098 value. If so, make that the next host, and don't count this one. This is a
5099 heuristic to make sure that different MXs do get tried. With a normal kind
5100 of retry rule, they would get tried anyway when the earlier hosts were
5101 delayed, but if the domain has a "retry every time" type of rule - as is
5102 often used for the the very large ISPs, that won't happen. */
5103
5104 else
5105 {
5106 host_item * thost;
5107 /* Make a copy of the host if it is local to this invocation
5108 of the transport. */
5109
5110 if (expanded_hosts)
5111 {
5112 thost = store_get(sizeof(host_item));
5113 *thost = *host;
5114 thost->name = string_copy(host->name);
5115 thost->address = string_copy(host->address);
5116 }
5117 else
5118 thost = host;
5119
5120 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5121 {
5122 DEBUG(D_transport)
5123 debug_printf("hosts_max_try limit reached with this host\n");
5124 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5125 {
5126 nexthost = h;
5127 unexpired_hosts_tried--;
5128 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5129 "and will be tried\n");
5130 break;
5131 }
5132 }
5133
5134 /* Attempt the delivery. */
5135
5136 total_hosts_tried++;
5137 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5138 &message_defer, FALSE);
5139
5140 /* Yield is one of:
5141 OK => connection made, each address contains its result;
5142 message_defer is set for message-specific defers (when all
5143 recipients are marked defer)
5144 DEFER => there was a non-message-specific delivery problem;
5145 ERROR => there was a problem setting up the arguments for a filter,
5146 or there was a problem with expanding added headers
5147 */
5148
5149 /* If the result is not OK, there was a non-message-specific problem.
5150 If the result is DEFER, we need to write to the logs saying what happened
5151 for this particular host, except in the case of authentication and TLS
5152 failures, where the log has already been written. If all hosts defer a
5153 general message is written at the end. */
5154
5155 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5156 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5157 write_logs(host, first_addr->message, first_addr->basic_errno);
5158
5159 #ifndef DISABLE_EVENT
5160 if (rc == DEFER)
5161 deferred_event_raise(first_addr, host);
5162 #endif
5163
5164 /* If STARTTLS was accepted, but there was a failure in setting up the
5165 TLS session (usually a certificate screwup), and the host is not in
5166 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5167 TLS forcibly turned off. We have to start from scratch with a new SMTP
5168 connection. That's why the retry is done from here, not from within
5169 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5170 session, so the in-clear transmission after those errors, if permitted,
5171 happens inside smtp_deliver().] */
5172
5173 #ifdef SUPPORT_TLS
5174 if ( rc == DEFER
5175 && first_addr->basic_errno == ERRNO_TLSFAILURE
5176 && ob->tls_tempfail_tryclear
5177 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5178 )
5179 {
5180 log_write(0, LOG_MAIN,
5181 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5182 first_addr->message, host->name, host->address);
5183 first_addr = prepare_addresses(addrlist, host);
5184 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5185 &message_defer, TRUE);
5186 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5187 write_logs(host, first_addr->message, first_addr->basic_errno);
5188 # ifndef DISABLE_EVENT
5189 if (rc == DEFER)
5190 deferred_event_raise(first_addr, host);
5191 # endif
5192 }
5193 #endif /*SUPPORT_TLS*/
5194 }
5195
5196 /* Delivery attempt finished */
5197
5198 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5199 message_id, host->name, host->address, pistring, addrlist->address,
5200 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5201
5202 /* Release serialization if set up */
5203
5204 if (serialize_key) enq_end(serialize_key);
5205
5206 /* If the result is DEFER, or if a host retry record is known to exist, we
5207 need to add an item to the retry chain for updating the retry database
5208 at the end of delivery. We only need to add the item to the top address,
5209 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5210 for any other delivery attempts using the same address. (It is copied into
5211 the unusable tree at the outer level, so even if different address blocks
5212 contain the same address, it still won't get tried again.) */
5213
5214 if (rc == DEFER || retry_host_key)
5215 {
5216 int delete_flag = rc != DEFER ? rf_delete : 0;
5217 if (!retry_host_key)
5218 {
5219 BOOL incl_ip;
5220 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5221 US"retry_include_ip_address", ob->retry_include_ip_address,
5222 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5223 incl_ip = TRUE; /* error; use most-specific retry record */
5224
5225 retry_host_key = incl_ip
5226 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5227 : string_sprintf("T:%S%s", host->name, pistring);
5228 }
5229
5230 /* If a delivery of another message over an existing SMTP connection
5231 yields DEFER, we do NOT set up retry data for the host. This covers the
5232 case when there are delays in routing the addresses in the second message
5233 that are so long that the server times out. This is alleviated by not
5234 routing addresses that previously had routing defers when handling an
5235 existing connection, but even so, this case may occur (e.g. if a
5236 previously happily routed address starts giving routing defers). If the
5237 host is genuinely down, another non-continued message delivery will
5238 notice it soon enough. */
5239
5240 if (delete_flag != 0 || !continue_hostname)
5241 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5242
5243 /* We may have tried an expired host, if its retry time has come; ensure
5244 the status reflects the expiry for the benefit of any other addresses. */
5245
5246 if (rc == DEFER)
5247 {
5248 host->status = host_is_expired
5249 ? hstatus_unusable_expired : hstatus_unusable;
5250 host->why = hwhy_deferred;
5251 }
5252 }
5253
5254 /* If message_defer is set (host was OK, but every recipient got deferred
5255 because of some message-specific problem), or if that had happened
5256 previously so that a message retry key exists, add an appropriate item
5257 to the retry chain. Note that if there was a message defer but now there is
5258 a host defer, the message defer record gets deleted. That seems perfectly
5259 reasonable. Also, stop the message from being remembered as waiting
5260 for specific hosts. */
5261
5262 if (message_defer || retry_message_key)
5263 {
5264 int delete_flag = message_defer ? 0 : rf_delete;
5265 if (!retry_message_key)
5266 {
5267 BOOL incl_ip;
5268 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5269 US"retry_include_ip_address", ob->retry_include_ip_address,
5270 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5271 incl_ip = TRUE; /* error; use most-specific retry record */
5272
5273 retry_message_key = incl_ip
5274 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5275 message_id)
5276 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5277 }
5278 retry_add_item(addrlist, retry_message_key,
5279 rf_message | rf_host | delete_flag);
5280 update_waiting = FALSE;
5281 }
5282
5283 /* Any return other than DEFER (that is, OK or ERROR) means that the
5284 addresses have got their final statuses filled in for this host. In the OK
5285 case, see if any of them are deferred. */
5286
5287 if (rc == OK)
5288 for (address_item * addr = addrlist; addr; addr = addr->next)
5289 if (addr->transport_return == DEFER)
5290 {
5291 some_deferred = TRUE;
5292 break;
5293 }
5294
5295 /* If no addresses deferred or the result was ERROR, return. We do this for
5296 ERROR because a failing filter set-up or add_headers expansion is likely to
5297 fail for any host we try. */
5298
5299 if (rc == ERROR || (rc == OK && !some_deferred))
5300 {
5301 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5302 return TRUE; /* Each address has its status */
5303 }
5304
5305 /* If the result was DEFER or some individual addresses deferred, let
5306 the loop run to try other hosts with the deferred addresses, except for the
5307 case when we were trying to deliver down an existing channel and failed.
5308 Don't try any other hosts in this case. */
5309
5310 if (continue_hostname) break;
5311
5312 /* If the whole delivery, or some individual addresses, were deferred and
5313 there are more hosts that could be tried, do not count this host towards
5314 the hosts_max_try limit if the age of the message is greater than the
5315 maximum retry time for this host. This means we may try try all hosts,
5316 ignoring the limit, when messages have been around for some time. This is
5317 important because if we don't try all hosts, the address will never time
5318 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5319
5320 if ((rc == DEFER || some_deferred) && nexthost)
5321 {
5322 BOOL timedout;
5323 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5324
5325 if (retry && retry->rules)
5326 {
5327 retry_rule *last_rule;
5328 for (last_rule = retry->rules;
5329 last_rule->next;
5330 last_rule = last_rule->next);
5331 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5332 }
5333 else timedout = TRUE; /* No rule => timed out */
5334
5335 if (timedout)
5336 {
5337 unexpired_hosts_tried--;
5338 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5339 "hosts_max_try (message older than host's retry time)\n");
5340 }
5341 }
5342
5343 DEBUG(D_transport)
5344 {
5345 if (unexpired_hosts_tried >= ob->hosts_max_try)
5346 debug_printf("reached transport hosts_max_try limit %d\n",
5347 ob->hosts_max_try);
5348 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5349 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5350 ob->hosts_max_try_hardlimit);
5351 }
5352
5353 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5354 } /* End of loop for trying multiple hosts. */
5355
5356 /* If we failed to find a matching host in the list, for an already-open
5357 connection, just close it and start over with the list. This can happen
5358 for routing that changes from run to run, or big multi-IP sites with
5359 round-robin DNS. */
5360
5361 if (continue_hostname && !continue_host_tried)
5362 {
5363 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5364
5365 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5366 #ifdef SUPPORT_TLS
5367 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5368 transport */
5369 /*XXX doublecheck that! */
5370
5371 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5372 {
5373 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5374 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5375 cutthrough.cctx.tls_ctx = NULL;
5376 cutthrough.is_tls = FALSE;
5377 }
5378 else
5379 #else
5380 (void) write(fd, US"QUIT\r\n", 6);
5381 #endif
5382 (void) close(fd);
5383 cutthrough.cctx.sock = -1;
5384 continue_hostname = NULL;
5385 goto retry_non_continued;
5386 }
5387
5388 /* This is the end of the loop that repeats iff expired is TRUE and
5389 ob->delay_after_cutoff is FALSE. The second time round we will
5390 try those hosts that haven't been tried since the message arrived. */
5391
5392 DEBUG(D_transport)
5393 {
5394 debug_printf("all IP addresses skipped or deferred at least one address\n");
5395 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5396 debug_printf("retrying IP addresses not tried since message arrived\n");
5397 }
5398 }
5399
5400
5401 /* Get here if all IP addresses are skipped or defer at least one address. In
5402 MUA wrapper mode, this will happen only for connection or other non-message-
5403 specific failures. Force the delivery status for all addresses to FAIL. */
5404
5405 if (mua_wrapper)
5406 {
5407 for (address_item * addr = addrlist; addr; addr = addr->next)
5408 addr->transport_return = FAIL;
5409 goto END_TRANSPORT;
5410 }
5411
5412 /* In the normal, non-wrapper case, add a standard message to each deferred
5413 address if there hasn't been an error, that is, if it hasn't actually been
5414 tried this time. The variable "expired" will be FALSE if any deliveries were
5415 actually tried, or if there was at least one host that was not expired. That
5416 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5417 a delivery has been tried, an error code will be set, and the failing of the
5418 message is handled by the retry code later.
5419
5420 If queue_smtp is set, or this transport was called to send a subsequent message
5421 down an existing TCP/IP connection, and something caused the host not to be
5422 found, we end up here, but can detect these cases and handle them specially. */
5423
5424 for (address_item * addr = addrlist; addr; addr = addr->next)
5425 {
5426 /* If host is not NULL, it means that we stopped processing the host list
5427 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5428 means we need to behave as if some hosts were skipped because their retry
5429 time had not come. Specifically, this prevents the address from timing out.
5430 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5431 hosts were tried. */
5432
5433 if (host)
5434 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5435 {
5436 DEBUG(D_transport)
5437 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5438 "hosts were tried\n");
5439 }
5440 else
5441 {
5442 DEBUG(D_transport)
5443 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5444 setflag(addr, af_retry_skipped);
5445 }
5446
5447 if (f.queue_smtp) /* no deliveries attempted */
5448 {
5449 addr->transport_return = DEFER;
5450 addr->basic_errno = 0;
5451 addr->message = US"SMTP delivery explicitly queued";
5452 }
5453
5454 else if ( addr->transport_return == DEFER
5455 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5456 && !addr->message
5457 )
5458 {
5459 addr->basic_errno = ERRNO_HRETRY;
5460 if (continue_hostname)
5461 addr->message = US"no host found for existing SMTP connection";
5462 else if (expired)
5463 {
5464 setflag(addr, af_pass_message); /* This is not a security risk */
5465 addr->message = string_sprintf(
5466 "all hosts%s have been failing for a long time %s",
5467 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5468 ob->delay_after_cutoff
5469 ? US"(and retry time not reached)"
5470 : US"and were last tried after this message arrived");
5471
5472 /* If we are already using fallback hosts, or there are no fallback hosts
5473 defined, convert the result to FAIL to cause a bounce. */
5474
5475 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5476 addr->transport_return = FAIL;
5477 }
5478 else
5479 {
5480 const char * s;
5481 if (hosts_retry == hosts_total)
5482 s = "retry time not reached for any host%s";
5483 else if (hosts_fail == hosts_total)
5484 s = "all host address lookups%s failed permanently";
5485 else if (hosts_defer == hosts_total)
5486 s = "all host address lookups%s failed temporarily";
5487 else if (hosts_serial == hosts_total)
5488 s = "connection limit reached for all hosts%s";
5489 else if (hosts_fail+hosts_defer == hosts_total)
5490 s = "all host address lookups%s failed";
5491 else
5492 s = "some host address lookups failed and retry time "
5493 "not reached for other hosts or connection limit reached%s";
5494
5495 addr->message = string_sprintf(s,
5496 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5497 }
5498 }
5499 }
5500
5501 /* Update the database which keeps information about which messages are waiting
5502 for which hosts to become available. For some message-specific errors, the
5503 update_waiting flag is turned off because we don't want follow-on deliveries in
5504 those cases. If this transport instance is explicitly limited to one message
5505 per connection then follow-on deliveries are not possible and there's no need
5506 to create/update the per-transport wait-<transport_name> database. */
5507
5508 if (update_waiting && tblock->connection_max_messages != 1)
5509 transport_update_waiting(hostlist, tblock->name);
5510
5511 END_TRANSPORT:
5512
5513 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5514
5515 return TRUE; /* Each address has its status */
5516 }
5517
5518 #endif /*!MACRO_PREDEF*/
5519 /* vi: aw ai sw=2
5520 */
5521 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.