projects / exim.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
TLS: refactor client-start interface
[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 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1953 BOOL pass_message = FALSE;
1954 uschar * message = NULL;
1955 int yield = OK;
1956 int rc;
1957 #ifdef SUPPORT_TLS
1958 uschar * tls_errstr;
1959 #endif
1960
1961 sx->conn_args.ob = ob;
1962
1963 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1964 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1965 sx->ok = FALSE;
1966 sx->send_rset = TRUE;
1967 sx->send_quit = TRUE;
1968 sx->setting_up = TRUE;
1969 sx->esmtp = TRUE;
1970 sx->esmtp_sent = FALSE;
1971 #ifdef SUPPORT_I18N
1972 sx->utf8_needed = FALSE;
1973 #endif
1974 sx->dsn_all_lasthop = TRUE;
1975 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1976 sx->conn_args.dane = FALSE;
1977 sx->dane_required =
1978 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1979 #endif
1980 #ifdef EXPERIMENTAL_PIPE_CONNECT
1981 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1982 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1983 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1984 #endif
1985
1986 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1987 sx->peer_offered = 0;
1988 sx->avoid_option = 0;
1989 sx->igquotstr = US"";
1990 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1991 #ifdef EXPERIMENTAL_DSN_INFO
1992 sx->smtp_greeting = NULL;
1993 sx->helo_response = NULL;
1994 #endif
1995
1996 smtp_command = US"initial connection";
1997 sx->buffer[0] = '\0';
1998
1999 /* Set up the buffer for reading SMTP response packets. */
2000
2001 sx->inblock.buffer = sx->inbuffer;
2002 sx->inblock.buffersize = sizeof(sx->inbuffer);
2003 sx->inblock.ptr = sx->inbuffer;
2004 sx->inblock.ptrend = sx->inbuffer;
2005
2006 /* Set up the buffer for holding SMTP commands while pipelining */
2007
2008 sx->outblock.buffer = sx->outbuffer;
2009 sx->outblock.buffersize = sizeof(sx->outbuffer);
2010 sx->outblock.ptr = sx->outbuffer;
2011 sx->outblock.cmd_count = 0;
2012 sx->outblock.authenticating = FALSE;
2013 sx->outblock.conn_args = NULL;
2014
2015 /* Reset the parameters of a TLS session. */
2016
2017 tls_out.bits = 0;
2018 tls_out.cipher = NULL; /* the one we may use for this transport */
2019 tls_out.ourcert = NULL;
2020 tls_out.peercert = NULL;
2021 tls_out.peerdn = NULL;
2022 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2023 tls_out.sni = NULL;
2024 #endif
2025 tls_out.ocsp = OCSP_NOT_REQ;
2026
2027 /* Flip the legacy TLS-related variables over to the outbound set in case
2028 they're used in the context of the transport. Don't bother resetting
2029 afterward (when being used by a transport) as we're in a subprocess.
2030 For verify, unflipped once the callout is dealt with */
2031
2032 tls_modify_variables(&tls_out);
2033
2034 #ifndef SUPPORT_TLS
2035 if (sx->smtps)
2036 {
2037 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2038 DEFER, FALSE);
2039 return ERROR;
2040 }
2041 #endif
2042
2043 /* Make a connection to the host if this isn't a continued delivery, and handle
2044 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2045 specially so they can be identified for retries. */
2046
2047 if (!continue_hostname)
2048 {
2049 if (sx->verify)
2050 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2051
2052 /* Get the actual port the connection will use, into sx->conn_args.host */
2053
2054 smtp_port_for_connect(sx->conn_args.host, sx->port);
2055
2056 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2057 /* Do TLSA lookup for DANE */
2058 {
2059 tls_out.dane_verified = FALSE;
2060 tls_out.tlsa_usage = 0;
2061
2062 if (sx->conn_args.host->dnssec == DS_YES)
2063 {
2064 if( sx->dane_required
2065 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2066 )
2067 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2068 {
2069 case OK: sx->conn_args.dane = TRUE;
2070 ob->tls_tempfail_tryclear = FALSE;
2071 break;
2072 case FAIL_FORCED: break;
2073 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2074 string_sprintf("DANE error: tlsa lookup %s",
2075 rc_to_string(rc)),
2076 rc, FALSE);
2077 # ifndef DISABLE_EVENT
2078 (void) event_raise(sx->conn_args.tblock->event_action,
2079 US"dane:fail", sx->dane_required
2080 ? US"dane-required" : US"dnssec-invalid");
2081 # endif
2082 return rc;
2083 }
2084 }
2085 else if (sx->dane_required)
2086 {
2087 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2088 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2089 FAIL, FALSE);
2090 # ifndef DISABLE_EVENT
2091 (void) event_raise(sx->conn_args.tblock->event_action,
2092 US"dane:fail", US"dane-required");
2093 # endif
2094 return FAIL;
2095 }
2096 }
2097 #endif /*DANE*/
2098
2099 /* Make the TCP connection */
2100
2101 sx->cctx.tls_ctx = NULL;
2102 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2103 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2104
2105 #ifdef EXPERIMENTAL_PIPE_CONNECT
2106 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2107 {
2108 sx->early_pipe_ok = TRUE;
2109 if ( read_ehlo_cache_entry(sx)
2110 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2111 {
2112 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2113 sx->early_pipe_active = TRUE;
2114 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2115 }
2116 }
2117
2118 if (sx->early_pipe_active)
2119 sx->outblock.conn_args = &sx->conn_args;
2120 else
2121 #endif
2122 {
2123 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2124 {
2125 uschar * msg = NULL;
2126 if (sx->verify)
2127 {
2128 msg = US strerror(errno);
2129 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2130 }
2131 set_errno_nohost(sx->addrlist,
2132 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2133 sx->verify ? string_sprintf("could not connect: %s", msg)
2134 : NULL,
2135 DEFER, FALSE);
2136 sx->send_quit = FALSE;
2137 return DEFER;
2138 }
2139 }
2140 /* Expand the greeting message while waiting for the initial response. (Makes
2141 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2142 delayed till here so that $sending_interface and $sending_port are set. */
2143 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2144 will be? Somehow I doubt it. */
2145
2146 if (sx->helo_data)
2147 if (!(sx->helo_data = expand_string(sx->helo_data)))
2148 if (sx->verify)
2149 log_write(0, LOG_MAIN|LOG_PANIC,
2150 "<%s>: failed to expand transport's helo_data value for callout: %s",
2151 sx->addrlist->address, expand_string_message);
2152
2153 #ifdef SUPPORT_I18N
2154 if (sx->helo_data)
2155 {
2156 expand_string_message = NULL;
2157 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2158 &expand_string_message)),
2159 expand_string_message)
2160 if (sx->verify)
2161 log_write(0, LOG_MAIN|LOG_PANIC,
2162 "<%s>: failed to expand transport's helo_data value for callout: %s",
2163 sx->addrlist->address, expand_string_message);
2164 else
2165 sx->helo_data = NULL;
2166 }
2167 #endif
2168
2169 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2170 is nevertheless a reasonably clean way of programming this kind of logic,
2171 where you want to escape on any error. */
2172
2173 if (!sx->smtps)
2174 {
2175 #ifdef EXPERIMENTAL_PIPE_CONNECT
2176 if (sx->early_pipe_active)
2177 {
2178 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2179 sx->outblock.cmd_count = 1;
2180 }
2181 else
2182 #endif
2183 {
2184 #ifdef TCP_QUICKACK
2185 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2186 sizeof(off));
2187 #endif
2188 if (!smtp_reap_banner(sx))
2189 goto RESPONSE_FAILED;
2190 }
2191
2192 #ifndef DISABLE_EVENT
2193 {
2194 uschar * s;
2195 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2196 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2197 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2198 if (s)
2199 {
2200 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2201 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2202 DEFER, FALSE);
2203 yield = DEFER;
2204 goto SEND_QUIT;
2205 }
2206 }
2207 #endif
2208
2209 /* Now check if the helo_data expansion went well, and sign off cleanly if
2210 it didn't. */
2211
2212 if (!sx->helo_data)
2213 {
2214 message = string_sprintf("failed to expand helo_data: %s",
2215 expand_string_message);
2216 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2217 yield = DEFER;
2218 goto SEND_QUIT;
2219 }
2220 }
2221
2222 /** Debugging without sending a message
2223 sx->addrlist->transport_return = DEFER;
2224 goto SEND_QUIT;
2225 **/
2226
2227 /* Errors that occur after this point follow an SMTP command, which is
2228 left in big_buffer by smtp_write_command() for use in error messages. */
2229
2230 smtp_command = big_buffer;
2231
2232 /* Tell the remote who we are...
2233
2234 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2235 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2236 greeting is of this form. The assumption was that the far end supports it
2237 properly... but experience shows that there are some that give 5xx responses,
2238 even though the banner includes "ESMTP" (there's a bloody-minded one that
2239 says "ESMTP not spoken here"). Cope with that case.
2240
2241 September 2000: Time has passed, and it seems reasonable now to always send
2242 EHLO at the start. It is also convenient to make the change while installing
2243 the TLS stuff.
2244
2245 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2246 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2247 would be no way to send out the mails, so there is now a host list
2248 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2249 PIPELINING problem as well. Maybe it can also be useful to cure other
2250 problems with broken servers.
2251
2252 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2253 Then somebody tried it with a Microsoft mailer... It seems that all other
2254 mailers use upper case for some reason (the RFC is quite clear about case
2255 independence) so, for peace of mind, I gave in. */
2256
2257 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2258
2259 /* Alas; be careful, since this goto is not an error-out, so conceivably
2260 we might set data between here and the target which we assume to exist
2261 and be usable. I can see this coming back to bite us. */
2262 #ifdef SUPPORT_TLS
2263 if (sx->smtps)
2264 {
2265 smtp_peer_options |= OPTION_TLS;
2266 suppress_tls = FALSE;
2267 ob->tls_tempfail_tryclear = FALSE;
2268 smtp_command = US"SSL-on-connect";
2269 goto TLS_NEGOTIATE;
2270 }
2271 #endif
2272
2273 if (sx->esmtp)
2274 {
2275 if (smtp_write_command(sx,
2276 #ifdef EXPERIMENTAL_PIPE_CONNECT
2277 sx->early_pipe_active ? SCMD_BUFFER :
2278 #endif
2279 SCMD_FLUSH,
2280 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2281 goto SEND_FAILED;
2282 sx->esmtp_sent = TRUE;
2283
2284 #ifdef EXPERIMENTAL_PIPE_CONNECT
2285 if (sx->early_pipe_active)
2286 {
2287 sx->pending_EHLO = TRUE;
2288
2289 /* If we have too many authenticators to handle and might need to AUTH
2290 for this transport, pipeline no further as we will need the
2291 list of auth methods offered. Reap the banner and EHLO. */
2292
2293 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2294 && f.smtp_in_early_pipe_no_auth)
2295 {
2296 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2297 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2298 goto SEND_FAILED;
2299 if (sync_responses(sx, 2, 0) != 0)
2300 {
2301 HDEBUG(D_transport)
2302 debug_printf("failed reaping pipelined cmd responses\n");
2303 goto RESPONSE_FAILED;
2304 }
2305 sx->early_pipe_active = FALSE;
2306 }
2307 }
2308 else
2309 #endif
2310 if (!smtp_reap_ehlo(sx))
2311 goto RESPONSE_FAILED;
2312 }
2313 else
2314 DEBUG(D_transport)
2315 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2316
2317 #ifdef EXPERIMENTAL_PIPE_CONNECT
2318 if (!sx->early_pipe_active)
2319 #endif
2320 if (!sx->esmtp)
2321 {
2322 BOOL good_response;
2323 int n = sizeof(sx->buffer);
2324 uschar * rsp = sx->buffer;
2325
2326 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2327 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2328
2329 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2330 goto SEND_FAILED;
2331 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2332 #ifdef EXPERIMENTAL_DSN_INFO
2333 sx->helo_response = string_copy(rsp);
2334 #endif
2335 if (!good_response)
2336 {
2337 /* Handle special logging for a closed connection after HELO
2338 when had previously sent EHLO */
2339
2340 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2341 {
2342 errno = ERRNO_SMTPCLOSED;
2343 goto EHLOHELO_FAILED;
2344 }
2345 memmove(sx->buffer, rsp, Ustrlen(rsp));
2346 goto RESPONSE_FAILED;
2347 }
2348 }
2349
2350 if (sx->esmtp || sx->lmtp)
2351 {
2352 #ifdef EXPERIMENTAL_PIPE_CONNECT
2353 if (!sx->early_pipe_active)
2354 #endif
2355 {
2356 sx->peer_offered = ehlo_response(sx->buffer,
2357 OPTION_TLS /* others checked later */
2358 #ifdef EXPERIMENTAL_PIPE_CONNECT
2359 | (sx->early_pipe_ok
2360 ? OPTION_IGNQ
2361 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2362 #ifdef SUPPORT_I18N
2363 | OPTION_UTF8
2364 #endif
2365 | OPTION_EARLY_PIPE
2366 : 0
2367 )
2368 #endif
2369 );
2370 #ifdef EXPERIMENTAL_PIPE_CONNECT
2371 if (sx->early_pipe_ok)
2372 {
2373 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2374
2375 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2376 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2377 {
2378 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2379 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2380 write_ehlo_cache_entry(sx);
2381 }
2382 }
2383 #endif
2384 }
2385
2386 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2387
2388 #ifdef SUPPORT_TLS
2389 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2390 #endif
2391 }
2392 }
2393
2394 /* For continuing deliveries down the same channel, having re-exec'd the socket
2395 is the standard input; for a socket held open from verify it is recorded
2396 in the cutthrough context block. Either way we don't need to redo EHLO here
2397 (but may need to do so for TLS - see below).
2398 Set up the pointer to where subsequent commands will be left, for
2399 error messages. Note that smtp_peer_options will have been
2400 set from the command line if they were set in the process that passed the
2401 connection on. */
2402
2403 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2404 as the continue goes via transport_pass_socket() and doublefork and exec.
2405 It does not wait. Unclear how we keep separate host's responses
2406 separate - we could match up by host ip+port as a bodge. */
2407
2408 else
2409 {
2410 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2411 {
2412 sx->cctx = cutthrough.cctx;
2413 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2414 }
2415 else
2416 {
2417 sx->cctx.sock = 0; /* stdin */
2418 sx->cctx.tls_ctx = NULL;
2419 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2420 }
2421 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2422 smtp_command = big_buffer;
2423 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2424
2425 /* For a continued connection with TLS being proxied for us, or a
2426 held-open verify connection with TLS, nothing more to do. */
2427
2428 if ( continue_proxy_cipher
2429 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2430 && cutthrough.is_tls)
2431 )
2432 {
2433 sx->peer_offered = smtp_peer_options;
2434 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2435 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2436 continue_proxy_cipher ? "proxied" : "verify conn with");
2437 return OK;
2438 }
2439 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2440 }
2441
2442 /* If TLS is available on this connection, whether continued or not, attempt to
2443 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2444 send another EHLO - the server may give a different answer in secure mode. We
2445 use a separate buffer for reading the response to STARTTLS so that if it is
2446 negative, the original EHLO data is available for subsequent analysis, should
2447 the client not be required to use TLS. If the response is bad, copy the buffer
2448 for error analysis. */
2449
2450 #ifdef SUPPORT_TLS
2451 if ( smtp_peer_options & OPTION_TLS
2452 && !suppress_tls
2453 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2454 && ( !sx->verify
2455 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2456 ) )
2457 {
2458 uschar buffer2[4096];
2459
2460 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2461 goto SEND_FAILED;
2462
2463 #ifdef EXPERIMENTAL_PIPE_CONNECT
2464 /* If doing early-pipelining reap the banner and EHLO-response but leave
2465 the response for the STARTTLS we just sent alone. */
2466
2467 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2468 {
2469 HDEBUG(D_transport)
2470 debug_printf("failed reaping pipelined cmd responses\n");
2471 goto RESPONSE_FAILED;
2472 }
2473 #endif
2474
2475 /* If there is an I/O error, transmission of this message is deferred. If
2476 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2477 false, we also defer. However, if there is a temporary rejection of STARTTLS
2478 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2479 STARTTLS, we carry on. This means we will try to send the message in clear,
2480 unless the host is in hosts_require_tls (tested below). */
2481
2482 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2483 {
2484 if ( errno != 0
2485 || buffer2[0] == 0
2486 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2487 )
2488 {
2489 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2490 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2491 goto RESPONSE_FAILED;
2492 }
2493 }
2494
2495 /* STARTTLS accepted: try to negotiate a TLS session. */
2496
2497 else
2498 TLS_NEGOTIATE:
2499 {
2500 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2501 {
2502 /* TLS negotiation failed; give an error. From outside, this function may
2503 be called again to try in clear on a new connection, if the options permit
2504 it for this host. */
2505 GNUTLS_CONN_FAILED:
2506 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2507
2508 # ifdef SUPPORT_DANE
2509 if (sx->conn_args.dane)
2510 {
2511 log_write(0, LOG_MAIN,
2512 "DANE attempt failed; TLS connection to %s [%s]: %s",
2513 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2514 # ifndef DISABLE_EVENT
2515 (void) event_raise(sx->conn_args.tblock->event_action,
2516 US"dane:fail", US"validation-failure"); /* could do with better detail */
2517 # endif
2518 }
2519 # endif
2520
2521 errno = ERRNO_TLSFAILURE;
2522 message = string_sprintf("TLS session: %s", tls_errstr);
2523 sx->send_quit = FALSE;
2524 goto TLS_FAILED;
2525 }
2526
2527 /* TLS session is set up */
2528
2529 smtp_peer_options_wrap = smtp_peer_options;
2530 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2531 if (addr->transport_return == PENDING_DEFER)
2532 {
2533 addr->cipher = tls_out.cipher;
2534 addr->ourcert = tls_out.ourcert;
2535 addr->peercert = tls_out.peercert;
2536 addr->peerdn = tls_out.peerdn;
2537 addr->ocsp = tls_out.ocsp;
2538 }
2539 }
2540 }
2541
2542 /* if smtps, we'll have smtp_command set to something else; always safe to
2543 reset it here. */
2544 smtp_command = big_buffer;
2545
2546 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2547 helo_data is null, we are dealing with a connection that was passed from
2548 another process, and so we won't have expanded helo_data above. We have to
2549 expand it here. $sending_ip_address and $sending_port are set up right at the
2550 start of the Exim process (in exim.c). */
2551
2552 if (tls_out.active.sock >= 0)
2553 {
2554 uschar * greeting_cmd;
2555
2556 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2557 {
2558 uschar *message = string_sprintf("failed to expand helo_data: %s",
2559 expand_string_message);
2560 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2561 yield = DEFER;
2562 goto SEND_QUIT;
2563 }
2564
2565 #ifdef EXPERIMENTAL_PIPE_CONNECT
2566 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2567 We're unlikely to get the group sent and delivered before the server sends its
2568 banner, but it's still worth sending as a group.
2569 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2570 the reverse. */
2571
2572 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2573 {
2574 sx->peer_offered = sx->ehlo_resp.crypted_features;
2575 if ((sx->early_pipe_active =
2576 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2577 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2578 }
2579 #endif
2580
2581 /* For SMTPS we need to wait for the initial OK response. */
2582 if (sx->smtps)
2583 #ifdef EXPERIMENTAL_PIPE_CONNECT
2584 if (sx->early_pipe_active)
2585 {
2586 sx->pending_BANNER = TRUE;
2587 sx->outblock.cmd_count = 1;
2588 }
2589 else
2590 #endif
2591 if (!smtp_reap_banner(sx))
2592 goto RESPONSE_FAILED;
2593
2594 if (sx->lmtp)
2595 greeting_cmd = US"LHLO";
2596 else if (sx->esmtp)
2597 greeting_cmd = US"EHLO";
2598 else
2599 {
2600 greeting_cmd = US"HELO";
2601 DEBUG(D_transport)
2602 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2603 }
2604
2605 if (smtp_write_command(sx,
2606 #ifdef EXPERIMENTAL_PIPE_CONNECT
2607 sx->early_pipe_active ? SCMD_BUFFER :
2608 #endif
2609 SCMD_FLUSH,
2610 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2611 goto SEND_FAILED;
2612
2613 #ifdef EXPERIMENTAL_PIPE_CONNECT
2614 if (sx->early_pipe_active)
2615 sx->pending_EHLO = TRUE;
2616 else
2617 #endif
2618 {
2619 if (!smtp_reap_ehlo(sx))
2620 #ifdef USE_GNUTLS
2621 {
2622 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2623 cert late, under TLS1.3 - which means here; the first time we try to
2624 receive crypted data. Treat it as if it was a connect-time failure.
2625 See also the early-pipe equivalent... which will be hard; every call
2626 to sync_responses will need to check the result.
2627 It would be nicer to have GnuTLS check the cert during the handshake.
2628 Can it do that, with all the flexibility we need? */
2629
2630 tls_errstr = US"error on first read";
2631 goto GNUTLS_CONN_FAILED;
2632 }
2633 #else
2634 goto RESPONSE_FAILED;
2635 #endif
2636 smtp_peer_options = 0;
2637 }
2638 }
2639
2640 /* If the host is required to use a secure channel, ensure that we
2641 have one. */
2642
2643 else if ( sx->smtps
2644 # ifdef SUPPORT_DANE
2645 || sx->conn_args.dane
2646 # endif
2647 # ifdef EXPERIMENTAL_REQUIRETLS
2648 || tls_requiretls & REQUIRETLS_MSG
2649 # endif
2650 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2651 )
2652 {
2653 errno =
2654 # ifdef EXPERIMENTAL_REQUIRETLS
2655 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2656 # endif
2657 ERRNO_TLSREQUIRED;
2658 message = string_sprintf("a TLS session is required, but %s",
2659 smtp_peer_options & OPTION_TLS
2660 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2661 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2662 if (sx->conn_args.dane)
2663 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2664 smtp_peer_options & OPTION_TLS
2665 ? US"validation-failure" /* could do with better detail */
2666 : US"starttls-not-supported");
2667 # endif
2668 goto TLS_FAILED;
2669 }
2670 #endif /*SUPPORT_TLS*/
2671
2672 /* If TLS is active, we have just started it up and re-done the EHLO command,
2673 so its response needs to be analyzed. If TLS is not active and this is a
2674 continued session down a previously-used socket, we haven't just done EHLO, so
2675 we skip this. */
2676
2677 if (continue_hostname == NULL
2678 #ifdef SUPPORT_TLS
2679 || tls_out.active.sock >= 0
2680 #endif
2681 )
2682 {
2683 if (sx->esmtp || sx->lmtp)
2684 {
2685 #ifdef EXPERIMENTAL_PIPE_CONNECT
2686 if (!sx->early_pipe_active)
2687 #endif
2688 {
2689 sx->peer_offered = ehlo_response(sx->buffer,
2690 0 /* no TLS */
2691 #ifdef EXPERIMENTAL_PIPE_CONNECT
2692 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2693 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2694 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2695 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2696
2697 #else
2698
2699 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2700 | OPTION_CHUNKING
2701 | OPTION_PRDR
2702 # ifdef SUPPORT_I18N
2703 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2704 /*XXX if we hand peercaps on to continued-conn processes,
2705 must not depend on this addr */
2706 # endif
2707 | OPTION_DSN
2708 | OPTION_PIPE
2709 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2710 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2711 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2712 # endif
2713 #endif
2714 );
2715 #ifdef EXPERIMENTAL_PIPE_CONNECT
2716 if (tls_out.active.sock >= 0)
2717 sx->ehlo_resp.crypted_features = sx->peer_offered;
2718 #endif
2719 }
2720
2721 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2722 lmtp_ignore_quota option was set. */
2723
2724 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2725
2726 /* If the response to EHLO specified support for the SIZE parameter, note
2727 this, provided size_addition is non-negative. */
2728
2729 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2730
2731 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2732 the current host, esmtp will be false, so PIPELINING can never be used. If
2733 the current host matches hosts_avoid_pipelining, don't do it. */
2734
2735 if ( sx->peer_offered & OPTION_PIPE
2736 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2737 smtp_peer_options |= OPTION_PIPE;
2738
2739 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2740 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2741
2742 if ( sx->peer_offered & OPTION_CHUNKING
2743 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2744 sx->peer_offered &= ~OPTION_CHUNKING;
2745
2746 if (sx->peer_offered & OPTION_CHUNKING)
2747 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2748
2749 #ifndef DISABLE_PRDR
2750 if ( sx->peer_offered & OPTION_PRDR
2751 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2752 sx->peer_offered &= ~OPTION_PRDR;
2753
2754 if (sx->peer_offered & OPTION_PRDR)
2755 DEBUG(D_transport) debug_printf("PRDR usable\n");
2756 #endif
2757
2758 /* Note if the server supports DSN */
2759 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2760 DEBUG(D_transport) debug_printf("%susing DSN\n",
2761 sx->peer_offered & OPTION_DSN ? "" : "not ");
2762
2763 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2764 if (sx->peer_offered & OPTION_REQUIRETLS)
2765 {
2766 smtp_peer_options |= OPTION_REQUIRETLS;
2767 DEBUG(D_transport) debug_printf(
2768 tls_requiretls & REQUIRETLS_MSG
2769 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2770 }
2771 #endif
2772
2773 #ifdef EXPERIMENTAL_PIPE_CONNECT
2774 if ( sx->early_pipe_ok
2775 && !sx->early_pipe_active
2776 && tls_out.active.sock >= 0
2777 && smtp_peer_options & OPTION_PIPE
2778 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2779 & OPTION_EARLY_PIPE)
2780 {
2781 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2782 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2783 write_ehlo_cache_entry(sx);
2784 }
2785 #endif
2786
2787 /* Note if the response to EHLO specifies support for the AUTH extension.
2788 If it has, check that this host is one we want to authenticate to, and do
2789 the business. The host name and address must be available when the
2790 authenticator's client driver is running. */
2791
2792 switch (yield = smtp_auth(sx))
2793 {
2794 default: goto SEND_QUIT;
2795 case OK: break;
2796 case FAIL_SEND: goto SEND_FAILED;
2797 case FAIL: goto RESPONSE_FAILED;
2798 }
2799 }
2800 }
2801 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2802
2803 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2804 message-specific. */
2805
2806 sx->setting_up = FALSE;
2807
2808 #ifdef SUPPORT_I18N
2809 if (sx->addrlist->prop.utf8_msg)
2810 {
2811 uschar * s;
2812
2813 /* If the transport sets a downconversion mode it overrides any set by ACL
2814 for the message. */
2815
2816 if ((s = ob->utf8_downconvert))
2817 {
2818 if (!(s = expand_string(s)))
2819 {
2820 message = string_sprintf("failed to expand utf8_downconvert: %s",
2821 expand_string_message);
2822 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2823 yield = DEFER;
2824 goto SEND_QUIT;
2825 }
2826 switch (*s)
2827 {
2828 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2829 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2830 break;
2831 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2832 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2833 break;
2834 case '-': if (s[1] == '1')
2835 {
2836 sx->addrlist->prop.utf8_downcvt = FALSE;
2837 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2838 }
2839 break;
2840 }
2841 }
2842
2843 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2844 && !sx->addrlist->prop.utf8_downcvt_maybe;
2845 DEBUG(D_transport) if (!sx->utf8_needed)
2846 debug_printf("utf8: %s downconvert\n",
2847 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2848 }
2849
2850 /* If this is an international message we need the host to speak SMTPUTF8 */
2851 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2852 {
2853 errno = ERRNO_UTF8_FWD;
2854 goto RESPONSE_FAILED;
2855 }
2856 #endif /*SUPPORT_I18N*/
2857
2858 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2859 /*XXX should tls_requiretls actually be per-addr? */
2860
2861 if ( tls_requiretls & REQUIRETLS_MSG
2862 && !(sx->peer_offered & OPTION_REQUIRETLS)
2863 )
2864 {
2865 sx->setting_up = TRUE;
2866 errno = ERRNO_REQUIRETLS;
2867 message = US"REQUIRETLS support is required from the server"
2868 " but it was not offered";
2869 DEBUG(D_transport) debug_printf("%s\n", message);
2870 goto TLS_FAILED;
2871 }
2872 #endif
2873
2874 return OK;
2875
2876
2877 {
2878 int code;
2879
2880 RESPONSE_FAILED:
2881 message = NULL;
2882 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2883 sx->buffer, &code, &message, &pass_message);
2884 yield = DEFER;
2885 goto FAILED;
2886
2887 SEND_FAILED:
2888 code = '4';
2889 message = US string_sprintf("send() to %s [%s] failed: %s",
2890 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2891 sx->send_quit = FALSE;
2892 yield = DEFER;
2893 goto FAILED;
2894
2895 EHLOHELO_FAILED:
2896 code = '4';
2897 message = string_sprintf("Remote host closed connection in response to %s"
2898 " (EHLO response was: %s)", smtp_command, sx->buffer);
2899 sx->send_quit = FALSE;
2900 yield = DEFER;
2901 goto FAILED;
2902
2903 /* This label is jumped to directly when a TLS negotiation has failed,
2904 or was not done for a host for which it is required. Values will be set
2905 in message and errno, and setting_up will always be true. Treat as
2906 a temporary error. */
2907
2908 #ifdef SUPPORT_TLS
2909 TLS_FAILED:
2910 # ifdef EXPERIMENTAL_REQUIRETLS
2911 if (errno == ERRNO_REQUIRETLS)
2912 code = '5', yield = FAIL;
2913 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2914 else
2915 # endif
2916 code = '4', yield = DEFER;
2917 goto FAILED;
2918 #endif
2919
2920 /* The failure happened while setting up the call; see if the failure was
2921 a 5xx response (this will either be on connection, or following HELO - a 5xx
2922 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2923 fail all addresses, as this host is never going to accept them. For other
2924 errors during setting up (timeouts or whatever), defer all addresses, and
2925 yield DEFER, so that the host is not tried again for a while.
2926
2927 XXX This peeking for another host feels like a layering violation. We want
2928 to note the host as unusable, but down here we shouldn't know if this was
2929 the last host to try for the addr(list). Perhaps the upper layer should be
2930 the one to do set_errno() ? The problem is that currently the addr is where
2931 errno etc. are stashed, but until we run out of hosts to try the errors are
2932 host-specific. Maybe we should enhance the host_item definition? */
2933
2934 FAILED:
2935 sx->ok = FALSE; /* For when reached by GOTO */
2936 set_errno(sx->addrlist, errno, message,
2937 sx->conn_args.host->next
2938 ? DEFER
2939 : code == '5'
2940 #ifdef SUPPORT_I18N
2941 || errno == ERRNO_UTF8_FWD
2942 #endif
2943 ? FAIL : DEFER,
2944 pass_message, sx->conn_args.host
2945 #ifdef EXPERIMENTAL_DSN_INFO
2946 , sx->smtp_greeting, sx->helo_response
2947 #endif
2948 );
2949 }
2950
2951
2952 SEND_QUIT:
2953
2954 if (sx->send_quit)
2955 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2956
2957 #ifdef SUPPORT_TLS
2958 if (sx->cctx.tls_ctx)
2959 {
2960 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2961 sx->cctx.tls_ctx = NULL;
2962 }
2963 #endif
2964
2965 /* Close the socket, and return the appropriate value, first setting
2966 works because the NULL setting is passed back to the calling process, and
2967 remote_max_parallel is forced to 1 when delivering over an existing connection,
2968 */
2969
2970 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2971 if (sx->send_quit)
2972 {
2973 shutdown(sx->cctx.sock, SHUT_WR);
2974 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2975 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2976 i--; /* drain socket */
2977 sx->send_quit = FALSE;
2978 }
2979 (void)close(sx->cctx.sock);
2980 sx->cctx.sock = -1;
2981
2982 #ifndef DISABLE_EVENT
2983 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2984 #endif
2985
2986 continue_transport = NULL;
2987 continue_hostname = NULL;
2988 return yield;
2989 }
2990
2991
2992
2993
2994 /* Create the string of options that will be appended to the MAIL FROM:
2995 in the connection context buffer */
2996
2997 static int
2998 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2999 {
3000 uschar * p = sx->buffer;
3001 address_item * addr;
3002 int address_count;
3003
3004 *p = 0;
3005
3006 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3007 send it, adding something to the message size to allow for imprecision
3008 and things that get added en route. Exim keeps the number of lines
3009 in a message, so we can give an accurate value for the original message, but we
3010 need some additional to handle added headers. (Double "." characters don't get
3011 included in the count.) */
3012
3013 if ( message_size > 0
3014 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3015 {
3016 /*XXX problem here under spool_files_wireformat?
3017 Or just forget about lines? Or inflate by a fixed proportion? */
3018
3019 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3020 while (*p) p++;
3021 }
3022
3023 #ifndef DISABLE_PRDR
3024 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3025 request that */
3026
3027 sx->prdr_active = FALSE;
3028 if (sx->peer_offered & OPTION_PRDR)
3029 for (address_item * addr = addrlist; addr; addr = addr->next)
3030 if (addr->transport_return == PENDING_DEFER)
3031 {
3032 for (addr = addr->next; addr; addr = addr->next)
3033 if (addr->transport_return == PENDING_DEFER)
3034 { /* at least two recipients to send */
3035 sx->prdr_active = TRUE;
3036 sprintf(CS p, " PRDR"); p += 5;
3037 break;
3038 }
3039 break;
3040 }
3041 #endif
3042
3043 #ifdef SUPPORT_I18N
3044 /* If it supports internationalised messages, and this meesage need that,
3045 request it */
3046
3047 if ( sx->peer_offered & OPTION_UTF8
3048 && addrlist->prop.utf8_msg
3049 && !addrlist->prop.utf8_downcvt
3050 )
3051 Ustrcpy(p, " SMTPUTF8"), p += 9;
3052 #endif
3053
3054 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3055 if (tls_requiretls & REQUIRETLS_MSG)
3056 Ustrcpy(p, " REQUIRETLS") , p += 11;
3057 #endif
3058
3059 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3060 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3061 addr && address_count < sx->max_rcpt;
3062 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3063 {
3064 address_count++;
3065 if (!(addr->dsn_flags & rf_dsnlasthop))
3066 {
3067 sx->dsn_all_lasthop = FALSE;
3068 break;
3069 }
3070 }
3071
3072 /* Add any DSN flags to the mail command */
3073
3074 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3075 {
3076 if (dsn_ret == dsn_ret_hdrs)
3077 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3078 else if (dsn_ret == dsn_ret_full)
3079 { Ustrcpy(p, " RET=FULL"); p += 9; }
3080
3081 if (dsn_envid)
3082 {
3083 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3084 while (*p) p++;
3085 }
3086 }
3087
3088 /* If an authenticated_sender override has been specified for this transport
3089 instance, expand it. If the expansion is forced to fail, and there was already
3090 an authenticated_sender for this message, the original value will be used.
3091 Other expansion failures are serious. An empty result is ignored, but there is
3092 otherwise no check - this feature is expected to be used with LMTP and other
3093 cases where non-standard addresses (e.g. without domains) might be required. */
3094
3095 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3096 return ERROR;
3097
3098 return OK;
3099 }
3100
3101
3102 static void
3103 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3104 {
3105 uschar * p = sx->buffer;
3106 *p = 0;
3107
3108 /* Add any DSN flags to the rcpt command */
3109
3110 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3111 {
3112 if (addr->dsn_flags & rf_dsnflags)
3113 {
3114 BOOL first = TRUE;
3115
3116 Ustrcpy(p, " NOTIFY=");
3117 while (*p) p++;
3118 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3119 {
3120 if (!first) *p++ = ',';
3121 first = FALSE;
3122 Ustrcpy(p, rf_names[i]);
3123 while (*p) p++;
3124 }
3125 }
3126
3127 if (addr->dsn_orcpt)
3128 {
3129 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3130 addr->dsn_orcpt);
3131 while (*p) p++;
3132 }
3133 }
3134 }
3135
3136
3137
3138 /*
3139 Return:
3140 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3141 -1 MAIL response error
3142 -2 any non-MAIL read i/o error
3143 -3 non-MAIL response timeout
3144 -4 internal error; channel still usable
3145 -5 transmit failed
3146 */
3147
3148 int
3149 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3150 {
3151 address_item * addr;
3152 int address_count;
3153 int rc;
3154
3155 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3156 {
3157 *yield = ERROR;
3158 return -4;
3159 }
3160
3161 /* From here until we send the DATA command, we can make use of PIPELINING
3162 if the server host supports it. The code has to be able to check the responses
3163 at any point, for when the buffer fills up, so we write it totally generally.
3164 When PIPELINING is off, each command written reports that it has flushed the
3165 buffer. */
3166
3167 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3168
3169 {
3170 uschar * s = sx->from_addr;
3171 #ifdef SUPPORT_I18N
3172 uschar * errstr = NULL;
3173
3174 /* If we must downconvert, do the from-address here. Remember we had to
3175 for the to-addresses (done below), and also (ugly) for re-doing when building
3176 the delivery log line. */
3177
3178 if ( sx->addrlist->prop.utf8_msg
3179 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3180 )
3181 {
3182 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3183 {
3184 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3185 *yield = ERROR;
3186 return -4;
3187 }
3188 setflag(sx->addrlist, af_utf8_downcvt);
3189 }
3190 #endif
3191
3192 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3193 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3194 }
3195
3196 mail_command = string_copy(big_buffer); /* Save for later error message */
3197
3198 switch(rc)
3199 {
3200 case -1: /* Transmission error */
3201 return -5;
3202
3203 case +1: /* Cmd was sent */
3204 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3205 (SOB sx->conn_args.ob)->command_timeout))
3206 {
3207 if (errno == 0 && sx->buffer[0] == '4')
3208 {
3209 errno = ERRNO_MAIL4XX;
3210 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3211 }
3212 return -1;
3213 }
3214 sx->pending_MAIL = FALSE;
3215 break;
3216
3217 /* otherwise zero: command queued for pipeline */
3218 }
3219
3220 /* Pass over all the relevant recipient addresses for this host, which are the
3221 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3222 several before we have to read the responses for those seen so far. This
3223 checking is done by a subroutine because it also needs to be done at the end.
3224 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3225 the next one if not all are sent.
3226
3227 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3228 last address because we want to abort if any recipients have any kind of
3229 problem, temporary or permanent. We know that all recipient addresses will have
3230 the PENDING_DEFER status, because only one attempt is ever made, and we know
3231 that max_rcpt will be large, so all addresses will be done at once.
3232
3233 For verify we flush the pipeline after any (the only) rcpt address. */
3234
3235 for (addr = sx->first_addr, address_count = 0;
3236 addr && address_count < sx->max_rcpt;
3237 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3238 {
3239 int count;
3240 BOOL no_flush;
3241 uschar * rcpt_addr;
3242
3243 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3244 ? dsn_support_yes : dsn_support_no;
3245
3246 address_count++;
3247 no_flush = pipelining_active && !sx->verify
3248 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3249
3250 build_rcptcmd_options(sx, addr);
3251
3252 /* Now send the RCPT command, and process outstanding responses when
3253 necessary. After a timeout on RCPT, we just end the function, leaving the
3254 yield as OK, because this error can often mean that there is a problem with
3255 just one address, so we don't want to delay the host. */
3256
3257 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3258
3259 #ifdef SUPPORT_I18N
3260 if ( testflag(sx->addrlist, af_utf8_downcvt)
3261 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3262 )
3263 {
3264 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3265 errno = ERRNO_EXPANDFAIL;
3266 return -5; /*XXX too harsh? */
3267 }
3268 #endif
3269
3270 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3271 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3272
3273 if (count < 0) return -5;
3274 if (count > 0)
3275 {
3276 switch(sync_responses(sx, count, 0))
3277 {
3278 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3279 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3280 break;
3281
3282 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3283 if (!sx->lmtp) /* can't tell about progress yet */
3284 sx->completed_addr = TRUE;
3285 case 0: /* No 2xx or 5xx, but no probs */
3286 break;
3287
3288 case -1: return -3; /* Timeout on RCPT */
3289 case -2: return -2; /* non-MAIL read i/o error */
3290 default: return -1; /* any MAIL error */
3291
3292 #ifdef EXPERIMENTAL_PIPE_CONNECT
3293 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3294 case -5: return -1; /* TLS first-read error */
3295 #endif
3296 }
3297 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3298 }
3299 } /* Loop for next address */
3300
3301 sx->next_addr = addr;
3302 return 0;
3303 }
3304
3305
3306 #ifdef SUPPORT_TLS
3307 /*****************************************************
3308 * Proxy TLS connection for another transport process *
3309 ******************************************************/
3310 /*
3311 Close the unused end of the pipe, fork once more, then use the given buffer
3312 as a staging area, and select on both the given fd and the TLS'd client-fd for
3313 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3314 Do blocking full-size writes, and reads under a timeout. Once both input
3315 channels are closed, exit the process.
3316
3317 Arguments:
3318 ct_ctx tls context
3319 buf space to use for buffering
3320 bufsiz size of buffer
3321 pfd pipe filedescriptor array; [0] is comms to proxied process
3322 timeout per-read timeout, seconds
3323 */
3324
3325 void
3326 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3327 int timeout)
3328 {
3329 fd_set rfds, efds;
3330 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3331 int rc, i;
3332
3333 close(pfd[1]);
3334 if ((rc = fork()))
3335 {
3336 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3337 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3338 }
3339
3340 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3341 set_process_info("proxying TLS connection for continued transport");
3342 FD_ZERO(&rfds);
3343 FD_SET(tls_out.active.sock, &rfds);
3344 FD_SET(pfd[0], &rfds);
3345
3346 for (int fd_bits = 3; fd_bits; )
3347 {
3348 time_t time_left = timeout;
3349 time_t time_start = time(NULL);
3350
3351 /* wait for data */
3352 efds = rfds;
3353 do
3354 {
3355 struct timeval tv = { time_left, 0 };
3356
3357 rc = select(max_fd,
3358 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3359
3360 if (rc < 0 && errno == EINTR)
3361 if ((time_left -= time(NULL) - time_start) > 0) continue;
3362
3363 if (rc <= 0)
3364 {
3365 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3366 goto done;
3367 }
3368
3369 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3370 {
3371 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3372 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3373 goto done;
3374 }
3375 }
3376 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3377
3378 /* handle inbound data */
3379 if (FD_ISSET(tls_out.active.sock, &rfds))
3380 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3381 {
3382 fd_bits &= ~1;
3383 FD_CLR(tls_out.active.sock, &rfds);
3384 shutdown(pfd[0], SHUT_WR);
3385 timeout = 5;
3386 }
3387 else
3388 {
3389 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3390 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3391 }
3392 else if (fd_bits & 1)
3393 FD_SET(tls_out.active.sock, &rfds);
3394
3395 /* handle outbound data */
3396 if (FD_ISSET(pfd[0], &rfds))
3397 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3398 {
3399 fd_bits = 0;
3400 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3401 ct_ctx = NULL;
3402 }
3403 else
3404 {
3405 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3406 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3407 goto done;
3408 }
3409 else if (fd_bits & 2)
3410 FD_SET(pfd[0], &rfds);
3411 }
3412
3413 done:
3414 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3415 exim_exit(0, US"TLS proxy");
3416 }
3417 #endif
3418
3419
3420 /*************************************************
3421 * Deliver address list to given host *
3422 *************************************************/
3423
3424 /* If continue_hostname is not null, we get here only when continuing to
3425 deliver down an existing channel. The channel was passed as the standard
3426 input. TLS is never active on a passed channel; the previous process always
3427 closes it down before passing the connection on.
3428
3429 Otherwise, we have to make a connection to the remote host, and do the
3430 initial protocol exchange.
3431
3432 When running as an MUA wrapper, if the sender or any recipient is rejected,
3433 temporarily or permanently, we force failure for all recipients.
3434
3435 Arguments:
3436 addrlist chain of potential addresses to deliver; only those whose
3437 transport_return field is set to PENDING_DEFER are currently
3438 being processed; others should be skipped - they have either
3439 been delivered to an earlier host or IP address, or been
3440 failed by one of them.
3441 host host to deliver to
3442 host_af AF_INET or AF_INET6
3443 defport default TCP/IP port to use if host does not specify, in host
3444 byte order
3445 interface interface to bind to, or NULL
3446 tblock transport instance block
3447 message_defer set TRUE if yield is OK, but all addresses were deferred
3448 because of a non-recipient, non-host failure, that is, a
3449 4xx response to MAIL FROM, DATA, or ".". This is a defer
3450 that is specific to the message.
3451 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3452 a second attempt after TLS initialization fails
3453
3454 Returns: OK - the connection was made and the delivery attempted;
3455 the result for each address is in its data block.
3456 DEFER - the connection could not be made, or something failed
3457 while setting up the SMTP session, or there was a
3458 non-message-specific error, such as a timeout.
3459 ERROR - a filter command is specified for this transport,
3460 and there was a problem setting it up; OR helo_data
3461 or add_headers or authenticated_sender is specified
3462 for this transport, and the string failed to expand
3463 */
3464
3465 static int
3466 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3467 uschar *interface, transport_instance *tblock,
3468 BOOL *message_defer, BOOL suppress_tls)
3469 {
3470 smtp_transport_options_block * ob = SOB tblock->options_block;
3471 int yield = OK;
3472 int save_errno;
3473 int rc;
3474 struct timeval start_delivery_time;
3475
3476 BOOL pass_message = FALSE;
3477 uschar *message = NULL;
3478 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3479
3480 smtp_context sx;
3481
3482 gettimeofday(&start_delivery_time, NULL);
3483 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3484 *message_defer = FALSE;
3485
3486 sx.addrlist = addrlist;
3487 sx.conn_args.host = host;
3488 sx.conn_args.host_af = host_af,
3489 sx.port = defport;
3490 sx.conn_args.interface = interface;
3491 sx.helo_data = NULL;
3492 sx.conn_args.tblock = tblock;
3493 sx.verify = FALSE;
3494 sx.sync_addr = sx.first_addr = addrlist;
3495
3496 /* Get the channel set up ready for a message (MAIL FROM being the next
3497 SMTP command to send */
3498
3499 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3500 return rc;
3501
3502 /* If there is a filter command specified for this transport, we can now
3503 set it up. This cannot be done until the identify of the host is known. */
3504
3505 if (tblock->filter_command)
3506 {
3507 transport_filter_timeout = tblock->filter_timeout;
3508
3509 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3510 yield ERROR. */
3511
3512 if (!transport_set_up_command(&transport_filter_argv,
3513 tblock->filter_command, TRUE, DEFER, addrlist,
3514 string_sprintf("%.50s transport", tblock->name), NULL))
3515 {
3516 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3517 FALSE);
3518 yield = ERROR;
3519 goto SEND_QUIT;
3520 }
3521
3522 if ( transport_filter_argv
3523 && *transport_filter_argv
3524 && **transport_filter_argv
3525 && sx.peer_offered & OPTION_CHUNKING
3526 )
3527 {
3528 sx.peer_offered &= ~OPTION_CHUNKING;
3529 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3530 }
3531 }
3532
3533 /* For messages that have more than the maximum number of envelope recipients,
3534 we want to send several transactions down the same SMTP connection. (See
3535 comments in deliver.c as to how this reconciles, heuristically, with
3536 remote_max_parallel.) This optimization was added to Exim after the following
3537 code was already working. The simplest way to put it in without disturbing the
3538 code was to use a goto to jump back to this point when there is another
3539 transaction to handle. */
3540
3541 SEND_MESSAGE:
3542 sx.from_addr = return_path;
3543 sx.sync_addr = sx.first_addr;
3544 sx.ok = FALSE;
3545 sx.send_rset = TRUE;
3546 sx.completed_addr = FALSE;
3547
3548
3549 /* If we are a continued-connection-after-verify the MAIL and RCPT
3550 commands were already sent; do not re-send but do mark the addrs as
3551 having been accepted up to RCPT stage. A traditional cont-conn
3552 always has a sequence number greater than one. */
3553
3554 if (continue_hostname && continue_sequence == 1)
3555 {
3556 sx.peer_offered = smtp_peer_options;
3557 sx.pending_MAIL = FALSE;
3558 sx.ok = TRUE;
3559 sx.next_addr = NULL;
3560
3561 for (address_item * addr = addrlist; addr; addr = addr->next)
3562 addr->transport_return = PENDING_OK;
3563 }
3564 else
3565 {
3566 /* Initiate a message transfer. */
3567
3568 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3569 {
3570 case 0: break;
3571 case -1: case -2: goto RESPONSE_FAILED;
3572 case -3: goto END_OFF;
3573 case -4: goto SEND_QUIT;
3574 default: goto SEND_FAILED;
3575 }
3576
3577 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3578 permanently or temporarily. We should have flushed and synced after the last
3579 RCPT. */
3580
3581 if (mua_wrapper)
3582 {
3583 address_item * a;
3584 unsigned cnt;
3585
3586 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3587 if (a->transport_return != PENDING_OK)
3588 {
3589 /*XXX could we find a better errno than 0 here? */
3590 set_errno_nohost(addrlist, 0, a->message, FAIL,
3591 testflag(a, af_pass_message));
3592 sx.ok = FALSE;
3593 break;
3594 }
3595 }
3596 }
3597
3598 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3599 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3600 have a good recipient buffered up if we are pipelining. We don't want to waste
3601 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3602 are pipelining. The responses are all handled by sync_responses().
3603 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3604 to send is. */
3605
3606 if ( !(sx.peer_offered & OPTION_CHUNKING)
3607 && (sx.ok || (pipelining_active && !mua_wrapper)))
3608 {
3609 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3610
3611 if (count < 0) goto SEND_FAILED;
3612 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3613 {
3614 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3615 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3616 break;
3617
3618 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3619 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3620 case 0: break; /* No 2xx or 5xx, but no probs */
3621
3622 case -1: goto END_OFF; /* Timeout on RCPT */
3623
3624 #ifdef EXPERIMENTAL_PIPE_CONNECT
3625 case -5: /* TLS first-read error */
3626 case -4: HDEBUG(D_transport)
3627 debug_printf("failed reaping pipelined cmd responses\n");
3628 #endif
3629 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3630 }
3631 pipelining_active = FALSE;
3632 data_command = string_copy(big_buffer); /* Save for later error message */
3633 }
3634
3635 /* If there were no good recipients (but otherwise there have been no
3636 problems), just set ok TRUE, since we have handled address-specific errors
3637 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3638 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3639 well as body. Set the appropriate timeout value to be used for each chunk.
3640 (Haven't been able to make it work using select() for writing yet.) */
3641
3642 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3643 {
3644 /* Save the first address of the next batch. */
3645 sx.first_addr = sx.next_addr;
3646
3647 sx.ok = TRUE;
3648 }
3649 else
3650 {
3651 transport_ctx tctx = {
3652 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3653 .tblock = tblock,
3654 .addr = addrlist,
3655 .check_string = US".",
3656 .escape_string = US"..", /* Escaping strings */
3657 .options =
3658 topt_use_crlf | topt_escape_headers
3659 | (tblock->body_only ? topt_no_headers : 0)
3660 | (tblock->headers_only ? topt_no_body : 0)
3661 | (tblock->return_path_add ? topt_add_return_path : 0)
3662 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3663 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3664 };
3665
3666 /* If using CHUNKING we need a callback from the generic transport
3667 support to us, for the sending of BDAT smtp commands and the reaping
3668 of responses. The callback needs a whole bunch of state so set up
3669 a transport-context structure to be passed around. */
3670
3671 if (sx.peer_offered & OPTION_CHUNKING)
3672 {
3673 tctx.check_string = tctx.escape_string = NULL;
3674 tctx.options |= topt_use_bdat;
3675 tctx.chunk_cb = smtp_chunk_cmd_callback;
3676 sx.pending_BDAT = FALSE;
3677 sx.good_RCPT = sx.ok;
3678 sx.cmd_count = 0;
3679 tctx.smtp_context = &sx;
3680 }
3681 else
3682 tctx.options |= topt_end_dot;
3683
3684 /* Save the first address of the next batch. */
3685 sx.first_addr = sx.next_addr;
3686
3687 /* Responses from CHUNKING commands go in buffer. Otherwise,
3688 there has not been a response. */
3689
3690 sx.buffer[0] = 0;
3691
3692 sigalrm_seen = FALSE;
3693 transport_write_timeout = ob->data_timeout;
3694 smtp_command = US"sending data block"; /* For error messages */
3695 DEBUG(D_transport|D_v)
3696 if (sx.peer_offered & OPTION_CHUNKING)
3697 debug_printf(" will write message using CHUNKING\n");
3698 else
3699 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3700 transport_count = 0;
3701
3702 #ifndef DISABLE_DKIM
3703 dkim_exim_sign_init();
3704 # ifdef EXPERIMENTAL_ARC
3705 {
3706 uschar * s = ob->arc_sign;
3707 if (s)
3708 {
3709 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3710 {
3711 if (!f.expand_string_forcedfail)
3712 {
3713 message = US"failed to expand arc_sign";
3714 sx.ok = FALSE;
3715 goto SEND_FAILED;
3716 }
3717 }
3718 else if (*s)
3719 {
3720 /* Ask dkim code to hash the body for ARC */
3721 (void) arc_ams_setup_sign_bodyhash();
3722 ob->dkim.force_bodyhash = TRUE;
3723 }
3724 }
3725 }
3726 # endif
3727 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3728 #else
3729 sx.ok = transport_write_message(&tctx, 0);
3730 #endif
3731
3732 /* transport_write_message() uses write() because it is called from other
3733 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3734 it can exit with "Broken pipe" as its error. This really means that the
3735 socket got closed at the far end. */
3736
3737 transport_write_timeout = 0; /* for subsequent transports */
3738
3739 /* Failure can either be some kind of I/O disaster (including timeout),
3740 or the failure of a transport filter or the expansion of added headers.
3741 Or, when CHUNKING, it can be a protocol-detected failure. */
3742
3743 if (!sx.ok)
3744 if (message) goto SEND_FAILED;
3745 else goto RESPONSE_FAILED;
3746
3747 /* We used to send the terminating "." explicitly here, but because of
3748 buffering effects at both ends of TCP/IP connections, you don't gain
3749 anything by keeping it separate, so it might as well go in the final
3750 data buffer for efficiency. This is now done by setting the topt_end_dot
3751 flag above. */
3752
3753 smtp_command = US"end of data";
3754
3755 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3756 {
3757 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3758 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3759 {
3760 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3761 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3762 break;
3763
3764 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3765 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3766 case 0: break; /* No 2xx or 5xx, but no probs */
3767
3768 case -1: goto END_OFF; /* Timeout on RCPT */
3769
3770 #ifdef EXPERIMENTAL_PIPE_CONNECT
3771 case -5: /* TLS first-read error */
3772 case -4: HDEBUG(D_transport)
3773 debug_printf("failed reaping pipelined cmd responses\n");
3774 #endif
3775 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3776 }
3777 }
3778
3779 #ifndef DISABLE_PRDR
3780 /* For PRDR we optionally get a partial-responses warning followed by the
3781 individual responses, before going on with the overall response. If we don't
3782 get the warning then deal with per non-PRDR. */
3783
3784 if(sx.prdr_active)
3785 {
3786 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3787 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3788 {
3789 case '2': sx.prdr_active = FALSE;
3790 sx.ok = TRUE;
3791 break;
3792 case '4': errno = ERRNO_DATA4XX;
3793 addrlist->more_errno |=
3794 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3795 break;
3796 }
3797 }
3798 else
3799 #endif
3800
3801 /* For non-PRDR SMTP, we now read a single response that applies to the
3802 whole message. If it is OK, then all the addresses have been delivered. */
3803
3804 if (!sx.lmtp)
3805 {
3806 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3807 ob->final_timeout);
3808 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3809 {
3810 errno = ERRNO_DATA4XX;
3811 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3812 }
3813 }
3814
3815 /* For LMTP, we get back a response for every RCPT command that we sent;
3816 some may be accepted and some rejected. For those that get a response, their
3817 status is fixed; any that are accepted have been handed over, even if later
3818 responses crash - at least, that's how I read RFC 2033.
3819
3820 If all went well, mark the recipient addresses as completed, record which
3821 host/IPaddress they were delivered to, and cut out RSET when sending another
3822 message down the same channel. Write the completed addresses to the journal
3823 now so that they are recorded in case there is a crash of hardware or
3824 software before the spool gets updated. Also record the final SMTP
3825 confirmation if needed (for SMTP only). */
3826
3827 if (sx.ok)
3828 {
3829 int flag = '=';
3830 struct timeval delivery_time;
3831 int len;
3832 uschar * conf = NULL;
3833
3834 timesince(&delivery_time, &start_delivery_time);
3835 sx.send_rset = FALSE;
3836 pipelining_active = FALSE;
3837
3838 /* Set up confirmation if needed - applies only to SMTP */
3839
3840 if (
3841 #ifdef DISABLE_EVENT
3842 LOGGING(smtp_confirmation) &&
3843 #endif
3844 !sx.lmtp
3845 )
3846 {
3847 const uschar *s = string_printing(sx.buffer);
3848 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3849 conf = (s == sx.buffer)? US string_copy(s) : US s;
3850 }
3851
3852 /* Process all transported addresses - for LMTP or PRDR, read a status for
3853 each one. */
3854
3855 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3856 {
3857 if (addr->transport_return != PENDING_OK) continue;
3858
3859 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3860 remaining addresses. Otherwise, it's a return code for just the one
3861 address. For temporary errors, add a retry item for the address so that
3862 it doesn't get tried again too soon. */
3863
3864 #ifndef DISABLE_PRDR
3865 if (sx.lmtp || sx.prdr_active)
3866 #else
3867 if (sx.lmtp)
3868 #endif
3869 {
3870 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3871 ob->final_timeout))
3872 {
3873 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3874 addr->message = string_sprintf(
3875 #ifndef DISABLE_PRDR
3876 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3877 #else
3878 "LMTP error after %s: %s",
3879 #endif
3880 data_command, string_printing(sx.buffer));
3881 setflag(addr, af_pass_message); /* Allow message to go to user */
3882 if (sx.buffer[0] == '5')
3883 addr->transport_return = FAIL;
3884 else
3885 {
3886 errno = ERRNO_DATA4XX;
3887 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3888 addr->transport_return = DEFER;
3889 #ifndef DISABLE_PRDR
3890 if (!sx.prdr_active)
3891 #endif
3892 retry_add_item(addr, addr->address_retry_key, 0);
3893 }
3894 continue;
3895 }
3896 sx.completed_addr = TRUE; /* NOW we can set this flag */
3897 if (LOGGING(smtp_confirmation))
3898 {
3899 const uschar *s = string_printing(sx.buffer);
3900 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3901 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3902 }
3903 }
3904
3905 /* SMTP, or success return from LMTP for this address. Pass back the
3906 actual host that was used. */
3907
3908 addr->transport_return = OK;
3909 addr->more_errno = delivery_time.tv_sec;
3910 addr->delivery_usec = delivery_time.tv_usec;
3911 addr->host_used = host;
3912 addr->special_action = flag;
3913 addr->message = conf;
3914
3915 if (tcp_out_fastopen)
3916 {
3917 setflag(addr, af_tcp_fastopen_conn);
3918 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3919 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3920 }
3921 if (sx.pipelining_used) setflag(addr, af_pipelining);
3922 #ifdef EXPERIMENTAL_PIPE_CONNECT
3923 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3924 #endif
3925 #ifndef DISABLE_PRDR
3926 if (sx.prdr_active) setflag(addr, af_prdr_used);
3927 #endif
3928 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3929 flag = '-';
3930
3931 #ifndef DISABLE_PRDR
3932 if (!sx.prdr_active)
3933 #endif
3934 {
3935 /* Update the journal. For homonymic addresses, use the base address plus
3936 the transport name. See lots of comments in deliver.c about the reasons
3937 for the complications when homonyms are involved. Just carry on after
3938 write error, as it may prove possible to update the spool file later. */
3939
3940 if (testflag(addr, af_homonym))
3941 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3942 else
3943 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3944
3945 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3946 len = Ustrlen(CS sx.buffer);
3947 if (write(journal_fd, sx.buffer, len) != len)
3948 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3949 "%s: %s", sx.buffer, strerror(errno));
3950 }
3951 }
3952
3953 #ifndef DISABLE_PRDR
3954 if (sx.prdr_active)
3955 {
3956 const uschar * overall_message;
3957
3958 /* PRDR - get the final, overall response. For any non-success
3959 upgrade all the address statuses. */
3960
3961 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3962 ob->final_timeout);
3963 if (!sx.ok)
3964 {
3965 if(errno == 0 && sx.buffer[0] == '4')
3966 {
3967 errno = ERRNO_DATA4XX;
3968 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3969 }
3970 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3971 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3972 addr->transport_return = PENDING_OK; /* allow set_errno action */
3973 goto RESPONSE_FAILED;
3974 }
3975
3976 /* Append the overall response to the individual PRDR response for logging
3977 and update the journal, or setup retry. */
3978
3979 overall_message = string_printing(sx.buffer);
3980 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3981 if (addr->transport_return == OK)
3982 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3983
3984 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3985 if (addr->transport_return == OK)
3986 {
3987 if (testflag(addr, af_homonym))
3988 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3989 else
3990 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3991
3992 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3993 len = Ustrlen(CS sx.buffer);
3994 if (write(journal_fd, sx.buffer, len) != len)
3995 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3996 "%s: %s", sx.buffer, strerror(errno));
3997 }
3998 else if (addr->transport_return == DEFER)
3999 retry_add_item(addr, addr->address_retry_key, -2);
4000 }
4001 #endif
4002
4003 /* Ensure the journal file is pushed out to disk. */
4004
4005 if (EXIMfsync(journal_fd) < 0)
4006 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4007 strerror(errno));
4008 }
4009 }
4010
4011
4012 /* Handle general (not specific to one address) failures here. The value of ok
4013 is used to skip over this code on the falling through case. A timeout causes a
4014 deferral. Other errors may defer or fail according to the response code, and
4015 may set up a special errno value, e.g. after connection chopped, which is
4016 assumed if errno == 0 and there is no text in the buffer. If control reaches
4017 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4018 the problem is not related to this specific message. */
4019
4020 if (!sx.ok)
4021 {
4022 int code, set_rc;
4023 uschar * set_message;
4024
4025 RESPONSE_FAILED:
4026 {
4027 save_errno = errno;
4028 message = NULL;
4029 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4030 sx.buffer, &code, &message, &pass_message);
4031 goto FAILED;
4032 }
4033
4034 SEND_FAILED:
4035 {
4036 save_errno = errno;
4037 code = '4';
4038 message = string_sprintf("send() to %s [%s] failed: %s",
4039 host->name, host->address, message ? message : US strerror(save_errno));
4040 sx.send_quit = FALSE;
4041 goto FAILED;
4042 }
4043
4044 FAILED:
4045 {
4046 BOOL message_error;
4047
4048 sx.ok = FALSE; /* For when reached by GOTO */
4049 set_message = message;
4050
4051 /* We want to handle timeouts after MAIL or "." and loss of connection after
4052 "." specially. They can indicate a problem with the sender address or with
4053 the contents of the message rather than a real error on the connection. These
4054 cases are treated in the same way as a 4xx response. This next bit of code
4055 does the classification. */
4056
4057 switch(save_errno)
4058 {
4059 case 0:
4060 case ERRNO_MAIL4XX:
4061 case ERRNO_DATA4XX:
4062 message_error = TRUE;
4063 break;
4064
4065 case ETIMEDOUT:
4066 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4067 Ustrncmp(smtp_command,"end ",4) == 0;
4068 break;
4069
4070 case ERRNO_SMTPCLOSED:
4071 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4072 break;
4073
4074 default:
4075 message_error = FALSE;
4076 break;
4077 }
4078
4079 /* Handle the cases that are treated as message errors. These are:
4080
4081 (a) negative response or timeout after MAIL
4082 (b) negative response after DATA
4083 (c) negative response or timeout or dropped connection after "."
4084 (d) utf8 support required and not offered
4085
4086 It won't be a negative response or timeout after RCPT, as that is dealt
4087 with separately above. The action in all cases is to set an appropriate
4088 error code for all the addresses, but to leave yield set to OK because the
4089 host itself has not failed. Of course, it might in practice have failed
4090 when we've had a timeout, but if so, we'll discover that at the next
4091 delivery attempt. For a temporary error, set the message_defer flag, and
4092 write to the logs for information if this is not the last host. The error
4093 for the last host will be logged as part of the address's log line. */
4094
4095 if (message_error)
4096 {
4097 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4098
4099 /* If there's an errno, the message contains just the identity of
4100 the host. */
4101
4102 if (code == '5')
4103 set_rc = FAIL;
4104 else /* Anything other than 5 is treated as temporary */
4105 {
4106 set_rc = DEFER;
4107 if (save_errno > 0)
4108 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4109
4110 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4111
4112 *message_defer = TRUE;
4113 }
4114 }
4115
4116 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4117 ".", or some other transportation error. We defer all addresses and yield
4118 DEFER, except for the case of failed add_headers expansion, or a transport
4119 filter failure, when the yield should be ERROR, to stop it trying other
4120 hosts. */
4121
4122 else
4123 {
4124 #ifdef EXPERIMENTAL_PIPE_CONNECT
4125 /* If we were early-pipelinng and the actual EHLO response did not match
4126 the cached value we assumed, we could have detected it and passed a
4127 custom errno through to here. It would be nice to RSET and retry right
4128 away, but to reliably do that we eould need an extra synch point before
4129 we committed to data and that would discard half the gained roundrips.
4130 Or we could summarily drop the TCP connection. but that is also ugly.
4131 Instead, we ignore the possibility (having freshened the cache) and rely
4132 on the server telling us with a nonmessage error if we have tried to
4133 do something it no longer supports. */
4134 #endif
4135 set_rc = DEFER;
4136 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4137 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4138 }
4139 }
4140
4141 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4142 #ifdef EXPERIMENTAL_DSN_INFO
4143 , sx.smtp_greeting, sx.helo_response
4144 #endif
4145 );
4146 }
4147
4148
4149 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4150 SMTP session tidily. However, if there were too many addresses to send in one
4151 message (indicated by first_addr being non-NULL) we want to carry on with the
4152 rest of them. Also, it is desirable to send more than one message down the SMTP
4153 connection if there are several waiting, provided we haven't already sent so
4154 many as to hit the configured limit. The function transport_check_waiting looks
4155 for a waiting message and returns its id. Then transport_pass_socket tries to
4156 set up a continued delivery by passing the socket on to another process. The
4157 variable send_rset is FALSE if a message has just been successfully transferred.
4158
4159 If we are already sending down a continued channel, there may be further
4160 addresses not yet delivered that are aimed at the same host, but which have not
4161 been passed in this run of the transport. In this case, continue_more will be
4162 true, and all we should do is send RSET if necessary, and return, leaving the
4163 channel open.
4164
4165 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4166 do not want to continue with other messages down the same channel, because that
4167 can lead to looping between two or more messages, all with the same,
4168 temporarily failing address(es). [The retry information isn't updated yet, so
4169 new processes keep on trying.] We probably also don't want to try more of this
4170 message's addresses either.
4171
4172 If we have started a TLS session, we have to end it before passing the
4173 connection to a new process. However, not all servers can handle this (Exim
4174 can), so we do not pass such a connection on if the host matches
4175 hosts_nopass_tls. */
4176
4177 DEBUG(D_transport)
4178 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4179 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4180 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4181
4182 if (sx.completed_addr && sx.ok && sx.send_quit)
4183 {
4184 BOOL more;
4185 smtp_compare_t t_compare;
4186
4187 t_compare.tblock = tblock;
4188 t_compare.current_sender_address = sender_address;
4189
4190 if ( sx.first_addr != NULL
4191 || f.continue_more
4192 || (
4193 #ifdef SUPPORT_TLS
4194 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4195 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4196 )
4197 &&
4198 #endif
4199 transport_check_waiting(tblock->name, host->name,
4200 tblock->connection_max_messages, new_message_id, &more,
4201 (oicf)smtp_are_same_identities, (void*)&t_compare)
4202 ) )
4203 {
4204 uschar *msg;
4205 BOOL pass_message;
4206
4207 if (sx.send_rset)
4208 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4209 {
4210 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4211 host->address, strerror(errno));
4212 sx.send_quit = FALSE;
4213 }
4214 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4215 '2', ob->command_timeout)))
4216 {
4217 int code;
4218 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4219 &pass_message);
4220 if (!sx.send_quit)
4221 {
4222 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4223 host->name, host->address, msg);
4224 }
4225 }
4226
4227 /* Either RSET was not needed, or it succeeded */
4228
4229 if (sx.ok)
4230 {
4231 #ifdef SUPPORT_TLS
4232 int pfd[2];
4233 #endif
4234 int socket_fd = sx.cctx.sock;
4235
4236
4237 if (sx.first_addr != NULL) /* More addresses still to be sent */
4238 { /* in this run of the transport */
4239 continue_sequence++; /* Causes * in logging */
4240 goto SEND_MESSAGE;
4241 }
4242
4243 /* Unless caller said it already has more messages listed for this host,
4244 pass the connection on to a new Exim process (below, the call to
4245 transport_pass_socket). If the caller has more ready, just return with
4246 the connection still open. */
4247
4248 #ifdef SUPPORT_TLS
4249 if (tls_out.active.sock >= 0)
4250 if ( f.continue_more
4251 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4252 {
4253 /* Before passing the socket on, or returning to caller with it still
4254 open, we must shut down TLS. Not all MTAs allow for the continuation
4255 of the SMTP session when TLS is shut down. We test for this by sending
4256 a new EHLO. If we don't get a good response, we don't attempt to pass
4257 the socket on. */
4258
4259 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4260 sx.cctx.tls_ctx = NULL;
4261 smtp_peer_options = smtp_peer_options_wrap;
4262 sx.ok = !sx.smtps
4263 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4264 >= 0
4265 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4266 '2', ob->command_timeout);
4267
4268 if (sx.ok && f.continue_more)
4269 return yield; /* More addresses for another run */
4270 }
4271 else
4272 {
4273 /* Set up a pipe for proxying TLS for the new transport process */
4274
4275 smtp_peer_options |= OPTION_TLS;
4276 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4277 socket_fd = pfd[1];
4278 else
4279 set_errno(sx.first_addr, errno, US"internal allocation problem",
4280 DEFER, FALSE, host
4281 # ifdef EXPERIMENTAL_DSN_INFO
4282 , sx.smtp_greeting, sx.helo_response
4283 # endif
4284 );
4285 }
4286 else
4287 #endif
4288 if (f.continue_more)
4289 return yield; /* More addresses for another run */
4290
4291 /* If the socket is successfully passed, we mustn't send QUIT (or
4292 indeed anything!) from here. */
4293
4294 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4295 propagate it from the initial
4296 */
4297 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4298 host->address, new_message_id, socket_fd))
4299 {
4300 sx.send_quit = FALSE;
4301
4302 /* We have passed the client socket to a fresh transport process.
4303 If TLS is still active, we need to proxy it for the transport we
4304 just passed the baton to. Fork a child to to do it, and return to
4305 get logging done asap. Which way to place the work makes assumptions
4306 about post-fork prioritisation which may not hold on all platforms. */
4307 #ifdef SUPPORT_TLS
4308 if (tls_out.active.sock >= 0)
4309 {
4310 int pid = fork();
4311 if (pid == 0) /* child; fork again to disconnect totally */
4312 {
4313 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4314 /* does not return */
4315 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4316 ob->command_timeout);
4317 }
4318
4319 if (pid > 0) /* parent */
4320 {
4321 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4322 close(pfd[0]);
4323 /* tidy the inter-proc to disconn the proxy proc */
4324 waitpid(pid, NULL, 0);
4325 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4326 sx.cctx.tls_ctx = NULL;
4327 (void)close(sx.cctx.sock);
4328 sx.cctx.sock = -1;
4329 continue_transport = NULL;
4330 continue_hostname = NULL;
4331 return yield;
4332 }
4333 log_write(0, LOG_PANIC_DIE, "fork failed");
4334 }
4335 #endif
4336 }
4337 }
4338
4339 /* If RSET failed and there are addresses left, they get deferred. */
4340 else
4341 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4342 #ifdef EXPERIMENTAL_DSN_INFO
4343 , sx.smtp_greeting, sx.helo_response
4344 #endif
4345 );
4346 }
4347 }
4348
4349 /* End off tidily with QUIT unless the connection has died or the socket has
4350 been passed to another process. There has been discussion on the net about what
4351 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4352 to wait for a response, but on the other hand, there isn't anything one can do
4353 with an error response, other than log it. Exim used to do that. However,
4354 further discussion suggested that it is positively advantageous not to wait for
4355 the response, but to close the session immediately. This is supposed to move
4356 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4357 load from the server. (Hosts that are both servers and clients may not see much
4358 difference, of course.) Further discussion indicated that this was safe to do
4359 on Unix systems which have decent implementations of TCP/IP that leave the
4360 connection around for a while (TIME_WAIT) after the application has gone away.
4361 This enables the response sent by the server to be properly ACKed rather than
4362 timed out, as can happen on broken TCP/IP implementations on other OS.
4363
4364 This change is being made on 31-Jul-98. After over a year of trouble-free
4365 operation, the old commented-out code was removed on 17-Sep-99. */
4366
4367 SEND_QUIT:
4368 #ifdef TCP_CORK
4369 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4370 #endif
4371 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4372
4373 END_OFF:
4374
4375 #ifdef SUPPORT_TLS
4376 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4377 sx.cctx.tls_ctx = NULL;
4378 #endif
4379
4380 /* Close the socket, and return the appropriate value, first setting
4381 works because the NULL setting is passed back to the calling process, and
4382 remote_max_parallel is forced to 1 when delivering over an existing connection,
4383
4384 If all went well and continue_more is set, we shouldn't actually get here if
4385 there are further addresses, as the return above will be taken. However,
4386 writing RSET might have failed, or there may be other addresses whose hosts are
4387 specified in the transports, and therefore not visible at top level, in which
4388 case continue_more won't get set. */
4389
4390 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4391 if (sx.send_quit)
4392 {
4393 shutdown(sx.cctx.sock, SHUT_WR);
4394 millisleep(f.running_in_test_harness ? 200 : 20);
4395 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4396 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4397 i--; /* drain socket */
4398 }
4399 (void)close(sx.cctx.sock);
4400
4401 #ifndef DISABLE_EVENT
4402 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4403 #endif
4404
4405 continue_transport = NULL;
4406 continue_hostname = NULL;
4407 return yield;
4408 }
4409
4410
4411
4412
4413 /*************************************************
4414 * Closedown entry point *
4415 *************************************************/
4416
4417 /* This function is called when exim is passed an open smtp channel
4418 from another incarnation, but the message which it has been asked
4419 to deliver no longer exists. The channel is on stdin.
4420
4421 We might do fancy things like looking for another message to send down
4422 the channel, but if the one we sought has gone, it has probably been
4423 delivered by some other process that itself will seek further messages,
4424 so just close down our connection.
4425
4426 Argument: pointer to the transport instance block
4427 Returns: nothing
4428 */
4429
4430 void
4431 smtp_transport_closedown(transport_instance *tblock)
4432 {
4433 smtp_transport_options_block * ob = SOB tblock->options_block;
4434 client_conn_ctx cctx;
4435 smtp_context sx;
4436 uschar buffer[256];
4437 uschar inbuffer[4096];
4438 uschar outbuffer[16];
4439
4440 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4441 cctx.sock = fileno(stdin);
4442 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4443
4444 sx.inblock.cctx = &cctx;
4445 sx.inblock.buffer = inbuffer;
4446 sx.inblock.buffersize = sizeof(inbuffer);
4447 sx.inblock.ptr = inbuffer;
4448 sx.inblock.ptrend = inbuffer;
4449
4450 sx.outblock.cctx = &cctx;
4451 sx.outblock.buffersize = sizeof(outbuffer);
4452 sx.outblock.buffer = outbuffer;
4453 sx.outblock.ptr = outbuffer;
4454 sx.outblock.cmd_count = 0;
4455 sx.outblock.authenticating = FALSE;
4456
4457 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4458 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4459 (void)close(cctx.sock);
4460 }
4461
4462
4463
4464 /*************************************************
4465 * Prepare addresses for delivery *
4466 *************************************************/
4467
4468 /* This function is called to flush out error settings from previous delivery
4469 attempts to other hosts. It also records whether we got here via an MX record
4470 or not in the more_errno field of the address. We are interested only in
4471 addresses that are still marked DEFER - others may have got delivered to a
4472 previously considered IP address. Set their status to PENDING_DEFER to indicate
4473 which ones are relevant this time.
4474
4475 Arguments:
4476 addrlist the list of addresses
4477 host the host we are delivering to
4478
4479 Returns: the first address for this delivery
4480 */
4481
4482 static address_item *
4483 prepare_addresses(address_item *addrlist, host_item *host)
4484 {
4485 address_item *first_addr = NULL;
4486 for (address_item * addr = addrlist; addr; addr = addr->next)
4487 if (addr->transport_return == DEFER)
4488 {
4489 if (!first_addr) first_addr = addr;
4490 addr->transport_return = PENDING_DEFER;
4491 addr->basic_errno = 0;
4492 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4493 addr->message = NULL;
4494 #ifdef SUPPORT_TLS
4495 addr->cipher = NULL;
4496 addr->ourcert = NULL;
4497 addr->peercert = NULL;
4498 addr->peerdn = NULL;
4499 addr->ocsp = OCSP_NOT_REQ;
4500 #endif
4501 #ifdef EXPERIMENTAL_DSN_INFO
4502 addr->smtp_greeting = NULL;
4503 addr->helo_response = NULL;
4504 #endif
4505 }
4506 return first_addr;
4507 }
4508
4509
4510
4511 /*************************************************
4512 * Main entry point *
4513 *************************************************/
4514
4515 /* See local README for interface details. As this is a remote transport, it is
4516 given a chain of addresses to be delivered in one connection, if possible. It
4517 always returns TRUE, indicating that each address has its own independent
4518 status set, except if there is a setting up problem, in which case it returns
4519 FALSE. */
4520
4521 BOOL
4522 smtp_transport_entry(
4523 transport_instance *tblock, /* data for this instantiation */
4524 address_item *addrlist) /* addresses we are working on */
4525 {
4526 int defport;
4527 int hosts_defer = 0;
4528 int hosts_fail = 0;
4529 int hosts_looked_up = 0;
4530 int hosts_retry = 0;
4531 int hosts_serial = 0;
4532 int hosts_total = 0;
4533 int total_hosts_tried = 0;
4534 BOOL expired = TRUE;
4535 uschar *expanded_hosts = NULL;
4536 uschar *pistring;
4537 uschar *tid = string_sprintf("%s transport", tblock->name);
4538 smtp_transport_options_block *ob = SOB tblock->options_block;
4539 host_item *hostlist = addrlist->host_list;
4540 host_item *host = NULL;
4541
4542 DEBUG(D_transport)
4543 {
4544 debug_printf("%s transport entered\n", tblock->name);
4545 for (address_item * addr = addrlist; addr; addr = addr->next)
4546 debug_printf(" %s\n", addr->address);
4547 if (hostlist)
4548 {
4549 debug_printf("hostlist:\n");
4550 for (host_item * host = hostlist; host; host = host->next)
4551 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4552 }
4553 if (continue_hostname)
4554 debug_printf("already connected to %s [%s] (on fd %d)\n",
4555 continue_hostname, continue_host_address,
4556 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4557 }
4558
4559 /* Set the flag requesting that these hosts be added to the waiting
4560 database if the delivery fails temporarily or if we are running with
4561 queue_smtp or a 2-stage queue run. This gets unset for certain
4562 kinds of error, typically those that are specific to the message. */
4563
4564 update_waiting = TRUE;
4565
4566 /* If a host list is not defined for the addresses - they must all have the
4567 same one in order to be passed to a single transport - or if the transport has
4568 a host list with hosts_override set, use the host list supplied with the
4569 transport. It is an error for this not to exist. */
4570
4571 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
4572 if (tls_requiretls & REQUIRETLS_MSG)
4573 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
4574 rather than modifying the transport? */
4575 #endif
4576
4577 if (!hostlist || (ob->hosts_override && ob->hosts))
4578 {
4579 if (!ob->hosts)
4580 {
4581 addrlist->message = string_sprintf("%s transport called with no hosts set",
4582 tblock->name);
4583 addrlist->transport_return = PANIC;
4584 return FALSE; /* Only top address has status */
4585 }
4586
4587 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4588 ob->hosts);
4589
4590 /* If the transport's host list contains no '$' characters, and we are not
4591 randomizing, it is fixed and therefore a chain of hosts can be built once
4592 and for all, and remembered for subsequent use by other calls to this
4593 transport. If, on the other hand, the host list does contain '$', or we are
4594 randomizing its order, we have to rebuild it each time. In the fixed case,
4595 as the hosts string will never be used again, it doesn't matter that we
4596 replace all the : characters with zeros. */
4597
4598 if (!ob->hostlist)
4599 {
4600 uschar *s = ob->hosts;
4601
4602 if (Ustrchr(s, '$') != NULL)
4603 {
4604 if (!(expanded_hosts = expand_string(s)))
4605 {
4606 addrlist->message = string_sprintf("failed to expand list of hosts "
4607 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4608 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4609 return FALSE; /* Only top address has status */
4610 }
4611 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4612 "\"%s\"\n", s, expanded_hosts);
4613 s = expanded_hosts;
4614 }
4615 else
4616 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4617
4618 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4619
4620 /* Check that the expansion yielded something useful. */
4621 if (!hostlist)
4622 {
4623 addrlist->message =
4624 string_sprintf("%s transport has empty hosts setting", tblock->name);
4625 addrlist->transport_return = PANIC;
4626 return FALSE; /* Only top address has status */
4627 }
4628
4629 /* If there was no expansion of hosts, save the host list for
4630 next time. */
4631
4632 if (!expanded_hosts) ob->hostlist = hostlist;
4633 }
4634
4635 /* This is not the first time this transport has been run in this delivery;
4636 the host list was built previously. */
4637
4638 else
4639 hostlist = ob->hostlist;
4640 }
4641
4642 /* The host list was supplied with the address. If hosts_randomize is set, we
4643 must sort it into a random order if it did not come from MX records and has not
4644 already been randomized (but don't bother if continuing down an existing
4645 connection). */
4646
4647 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4648 {
4649 host_item *newlist = NULL;
4650 while (hostlist)
4651 {
4652 host_item *h = hostlist;
4653 hostlist = hostlist->next;
4654
4655 h->sort_key = random_number(100);
4656
4657 if (!newlist)
4658 {
4659 h->next = NULL;
4660 newlist = h;
4661 }
4662 else if (h->sort_key < newlist->sort_key)
4663 {
4664 h->next = newlist;
4665 newlist = h;
4666 }
4667 else
4668 {
4669 host_item *hh = newlist;
4670 while (hh->next)
4671 {
4672 if (h->sort_key < hh->next->sort_key) break;
4673 hh = hh->next;
4674 }
4675 h->next = hh->next;
4676 hh->next = h;
4677 }
4678 }
4679
4680 hostlist = addrlist->host_list = newlist;
4681 }
4682
4683 /* Sort out the default port. */
4684
4685 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4686
4687 /* For each host-plus-IP-address on the list:
4688
4689 . If this is a continued delivery and the host isn't the one with the
4690 current connection, skip.
4691
4692 . If the status is unusable (i.e. previously failed or retry checked), skip.
4693
4694 . If no IP address set, get the address, either by turning the name into
4695 an address, calling gethostbyname if gethostbyname is on, or by calling
4696 the DNS. The DNS may yield multiple addresses, in which case insert the
4697 extra ones into the list.
4698
4699 . Get the retry data if not previously obtained for this address and set the
4700 field which remembers the state of this address. Skip if the retry time is
4701 not reached. If not, remember whether retry data was found. The retry string
4702 contains both the name and the IP address.
4703
4704 . Scan the list of addresses and mark those whose status is DEFER as
4705 PENDING_DEFER. These are the only ones that will be processed in this cycle
4706 of the hosts loop.
4707
4708 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4709 Some addresses may be successfully delivered, others may fail, and yet
4710 others may get temporary errors and so get marked DEFER.
4711
4712 . The return from the delivery attempt is OK if a connection was made and a
4713 valid SMTP dialogue was completed. Otherwise it is DEFER.
4714
4715 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4716
4717 . If fail to connect, or other defer state, add a retry item.
4718
4719 . If there are any addresses whose status is still DEFER, carry on to the
4720 next host/IPaddress, unless we have tried the number of hosts given
4721 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4722 there is some fancy logic for hosts_max_try that means its limit can be
4723 overstepped in some circumstances.
4724
4725 If we get to the end of the list, all hosts have deferred at least one address,
4726 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4727 delivery attempt to those hosts whose last try was before the arrival time of
4728 the current message. To cope with this, we have to go round the loop a second
4729 time. After that, set the status and error data for any addresses that haven't
4730 had it set already. */
4731
4732 for (int cutoff_retry = 0;
4733 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4734 cutoff_retry++)
4735 {
4736 host_item *nexthost = NULL;
4737 int unexpired_hosts_tried = 0;
4738 BOOL continue_host_tried = FALSE;
4739
4740 retry_non_continued:
4741 for (host = hostlist;
4742 host
4743 && unexpired_hosts_tried < ob->hosts_max_try
4744 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4745 host = nexthost)
4746 {
4747 int rc;
4748 int host_af;
4749 BOOL host_is_expired = FALSE;
4750 BOOL message_defer = FALSE;
4751 BOOL some_deferred = FALSE;
4752 address_item *first_addr = NULL;
4753 uschar *interface = NULL;
4754 uschar *retry_host_key = NULL;
4755 uschar *retry_message_key = NULL;
4756 uschar *serialize_key = NULL;
4757
4758 /* Default next host is next host. :-) But this can vary if the
4759 hosts_max_try limit is hit (see below). It may also be reset if a host
4760 address is looked up here (in case the host was multihomed). */
4761
4762 nexthost = host->next;
4763
4764 /* If the address hasn't yet been obtained from the host name, look it up
4765 now, unless the host is already marked as unusable. If it is marked as
4766 unusable, it means that the router was unable to find its IP address (in
4767 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4768 the lookup failed last time. We don't get this far if *all* MX records
4769 point to non-existent hosts; that is treated as a hard error.
4770
4771 We can just skip this host entirely. When the hosts came from the router,
4772 the address will timeout based on the other host(s); when the address is
4773 looked up below, there is an explicit retry record added.
4774
4775 Note that we mustn't skip unusable hosts if the address is not unset; they
4776 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4777
4778 if (!host->address)
4779 {
4780 int new_port, flags;
4781
4782 if (host->status >= hstatus_unusable)
4783 {
4784 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4785 host->name);
4786 continue;
4787 }
4788
4789 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4790
4791 /* The host name is permitted to have an attached port. Find it, and
4792 strip it from the name. Just remember it for now. */
4793
4794 new_port = host_item_get_port(host);
4795
4796 /* Count hosts looked up */
4797
4798 hosts_looked_up++;
4799
4800 /* Find by name if so configured, or if it's an IP address. We don't
4801 just copy the IP address, because we need the test-for-local to happen. */
4802
4803 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4804 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4805 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4806
4807 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4808 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4809 else
4810 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4811 &ob->dnssec, /* domains for request/require */
4812 NULL, NULL);
4813
4814 /* Update the host (and any additional blocks, resulting from
4815 multihoming) with a host-specific port, if any. */
4816
4817 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4818
4819 /* Failure to find the host at this time (usually DNS temporary failure)
4820 is really a kind of routing failure rather than a transport failure.
4821 Therefore we add a retry item of the routing kind, not to stop us trying
4822 to look this name up here again, but to ensure the address gets timed
4823 out if the failures go on long enough. A complete failure at this point
4824 commonly points to a configuration error, but the best action is still
4825 to carry on for the next host. */
4826
4827 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4828 {
4829 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4830 expired = FALSE;
4831 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4832 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4833 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4834 host->status = hstatus_unusable;
4835
4836 for (address_item * addr = addrlist; addr; addr = addr->next)
4837 {
4838 if (addr->transport_return != DEFER) continue;
4839 addr->basic_errno = ERRNO_UNKNOWNHOST;
4840 addr->message = string_sprintf(
4841 rc == HOST_FIND_SECURITY
4842 ? "lookup of IP address for %s was insecure"
4843 : "failed to lookup IP address for %s",
4844 host->name);
4845 }
4846 continue;
4847 }
4848
4849 /* If the host is actually the local host, we may have a problem, or
4850 there may be some cunning configuration going on. In the problem case,
4851 log things and give up. The default transport status is already DEFER. */
4852
4853 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4854 {
4855 for (address_item * addr = addrlist; addr; addr = addr->next)
4856 {
4857 addr->basic_errno = 0;
4858 addr->message = string_sprintf("%s transport found host %s to be "
4859 "local", tblock->name, host->name);
4860 }
4861 goto END_TRANSPORT;
4862 }
4863 } /* End of block for IP address lookup */
4864
4865 /* If this is a continued delivery, we are interested only in the host
4866 which matches the name of the existing open channel. The check is put
4867 here after the local host lookup, in case the name gets expanded as a
4868 result of the lookup. Set expired FALSE, to save the outer loop executing
4869 twice. */
4870
4871 if (continue_hostname)
4872 if ( Ustrcmp(continue_hostname, host->name) != 0
4873 || Ustrcmp(continue_host_address, host->address) != 0
4874 )
4875 {
4876 expired = FALSE;
4877 continue; /* With next host */
4878 }
4879 else
4880 continue_host_tried = TRUE;
4881
4882 /* Reset the default next host in case a multihomed host whose addresses
4883 are not looked up till just above added to the host list. */
4884
4885 nexthost = host->next;
4886
4887 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4888 domain is in queue_smtp_domains, we don't actually want to attempt any
4889 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4890 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4891 were not in it. We don't want to hold up all SMTP deliveries! Except when
4892 doing a two-stage queue run, don't do this if forcing. */
4893
4894 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4895 match_isinlist(addrlist->domain,
4896 (const uschar **)&queue_smtp_domains, 0,
4897 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4898 {
4899 expired = FALSE;
4900 for (address_item * addr = addrlist; addr; addr = addr->next)
4901 if (addr->transport_return == DEFER)
4902 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4903 continue; /* With next host */
4904 }
4905
4906 /* Count hosts being considered - purely for an intelligent comment
4907 if none are usable. */
4908
4909 hosts_total++;
4910
4911 /* Set $host and $host address now in case they are needed for the
4912 interface expansion or the serialize_hosts check; they remain set if an
4913 actual delivery happens. */
4914
4915 deliver_host = host->name;
4916 deliver_host_address = host->address;
4917 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4918 : host->dnssec == DS_NO ? US"no"
4919 : US"";
4920
4921 /* Set up a string for adding to the retry key if the port number is not
4922 the standard SMTP port. A host may have its own port setting that overrides
4923 the default. */
4924
4925 pistring = string_sprintf(":%d", host->port == PORT_NONE
4926 ? defport : host->port);
4927 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4928
4929 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4930 string is set, even if constant (as different transports can have different
4931 constant settings), we must add it to the key that is used for retries,
4932 because connections to the same host from a different interface should be
4933 treated separately. */
4934
4935 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4936 {
4937 uschar * s = ob->interface;
4938 if (s && *s)
4939 {
4940 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4941 return FALSE;
4942 pistring = string_sprintf("%s/%s", pistring, interface);
4943 }
4944 }
4945
4946 /* The first time round the outer loop, check the status of the host by
4947 inspecting the retry data. The second time round, we are interested only
4948 in expired hosts that haven't been tried since this message arrived. */
4949
4950 if (cutoff_retry == 0)
4951 {
4952 BOOL incl_ip;
4953 /* Ensure the status of the address is set by checking retry data if
4954 necessary. There may be host-specific retry data (applicable to all
4955 messages) and also data for retries of a specific message at this host.
4956 If either of these retry records are actually read, the keys used are
4957 returned to save recomputing them later. */
4958
4959 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4960 US"retry_include_ip_address", ob->retry_include_ip_address,
4961 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4962 continue; /* with next host */
4963
4964 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4965 incl_ip, &retry_host_key, &retry_message_key);
4966
4967 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4968 host->address ? host->address : US"", pistring,
4969 host->status == hstatus_usable ? "usable"
4970 : host->status == hstatus_unusable ? "unusable"
4971 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4972
4973 /* Skip this address if not usable at this time, noting if it wasn't
4974 actually expired, both locally and in the address. */
4975
4976 switch (host->status)
4977 {
4978 case hstatus_unusable:
4979 expired = FALSE;
4980 setflag(addrlist, af_retry_skipped);
4981 /* Fall through */
4982
4983 case hstatus_unusable_expired:
4984 switch (host->why)
4985 {
4986 case hwhy_retry: hosts_retry++; break;
4987 case hwhy_failed: hosts_fail++; break;
4988 case hwhy_insecure:
4989 case hwhy_deferred: hosts_defer++; break;
4990 }
4991
4992 /* If there was a retry message key, implying that previously there
4993 was a message-specific defer, we don't want to update the list of
4994 messages waiting for these hosts. */
4995
4996 if (retry_message_key) update_waiting = FALSE;
4997 continue; /* With the next host or IP address */
4998 }
4999 }
5000
5001 /* Second time round the loop: if the address is set but expired, and
5002 the message is newer than the last try, let it through. */
5003
5004 else
5005 {
5006 if ( !host->address
5007 || host->status != hstatus_unusable_expired
5008 || host->last_try > received_time.tv_sec)
5009 continue;
5010 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5011 host->name, host->address, pistring);
5012 host_is_expired = TRUE;
5013 }
5014
5015 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5016 it remains TRUE only if all hosts are expired and none are actually tried.
5017 */
5018
5019 expired = FALSE;
5020
5021 /* If this host is listed as one to which access must be serialized,
5022 see if another Exim process has a connection to it, and if so, skip
5023 this host. If not, update the database to record our connection to it
5024 and remember this for later deletion. Do not do any of this if we are
5025 sending the message down a pre-existing connection. */
5026
5027 if ( !continue_hostname
5028 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5029 {
5030 serialize_key = string_sprintf("host-serialize-%s", host->name);
5031 if (!enq_start(serialize_key, 1))
5032 {
5033 DEBUG(D_transport)
5034 debug_printf("skipping host %s because another Exim process "
5035 "is connected to it\n", host->name);
5036 hosts_serial++;
5037 continue;
5038 }
5039 }
5040
5041 /* OK, we have an IP address that is not waiting for its retry time to
5042 arrive (it might be expired) OR (second time round the loop) we have an
5043 expired host that hasn't been tried since the message arrived. Have a go
5044 at delivering the message to it. First prepare the addresses by flushing
5045 out the result of previous attempts, and finding the first address that
5046 is still to be delivered. */
5047
5048 first_addr = prepare_addresses(addrlist, host);
5049
5050 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5051 message_id, host->name, host->address, addrlist->address,
5052 addrlist->next ? ", ..." : "");
5053
5054 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5055 message_id, host->name, host->address, pistring, addrlist->address,
5056 addrlist->next ? ", ..." : "");
5057
5058 /* This is not for real; don't do the delivery. If there are
5059 any remaining hosts, list them. */
5060
5061 if (f.dont_deliver)
5062 {
5063 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5064 for (address_item * addr = addrlist; addr; addr = addr->next)
5065 {
5066 addr->host_used = host;
5067 addr->special_action = '*';
5068 addr->message = US"delivery bypassed by -N option";
5069 }
5070 DEBUG(D_transport)
5071 {
5072 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5073 "*** host and remaining hosts:\n", tblock->name);
5074 for (host_item * host2 = host; host2; host2 = host2->next)
5075 debug_printf(" %s [%s]\n", host2->name,
5076 host2->address ? host2->address : US"unset");
5077 }
5078 rc = OK;
5079 }
5080
5081 /* This is for real. If the host is expired, we don't count it for
5082 hosts_max_retry. This ensures that all hosts must expire before an address
5083 is timed out, unless hosts_max_try_hardlimit (which protects against
5084 lunatic DNS configurations) is reached.
5085
5086 If the host is not expired and we are about to hit the hosts_max_retry
5087 limit, check to see if there is a subsequent hosts with a different MX
5088 value. If so, make that the next host, and don't count this one. This is a
5089 heuristic to make sure that different MXs do get tried. With a normal kind
5090 of retry rule, they would get tried anyway when the earlier hosts were
5091 delayed, but if the domain has a "retry every time" type of rule - as is
5092 often used for the the very large ISPs, that won't happen. */
5093
5094 else
5095 {
5096 host_item * thost;
5097 /* Make a copy of the host if it is local to this invocation
5098 of the transport. */
5099
5100 if (expanded_hosts)
5101 {
5102 thost = store_get(sizeof(host_item));
5103 *thost = *host;
5104 thost->name = string_copy(host->name);
5105 thost->address = string_copy(host->address);
5106 }
5107 else
5108 thost = host;
5109
5110 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5111 {
5112 DEBUG(D_transport)
5113 debug_printf("hosts_max_try limit reached with this host\n");
5114 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5115 {
5116 nexthost = h;
5117 unexpired_hosts_tried--;
5118 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5119 "and will be tried\n");
5120 break;
5121 }
5122 }
5123
5124 /* Attempt the delivery. */
5125
5126 total_hosts_tried++;
5127 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5128 &message_defer, FALSE);
5129
5130 /* Yield is one of:
5131 OK => connection made, each address contains its result;
5132 message_defer is set for message-specific defers (when all
5133 recipients are marked defer)
5134 DEFER => there was a non-message-specific delivery problem;
5135 ERROR => there was a problem setting up the arguments for a filter,
5136 or there was a problem with expanding added headers
5137 */
5138
5139 /* If the result is not OK, there was a non-message-specific problem.
5140 If the result is DEFER, we need to write to the logs saying what happened
5141 for this particular host, except in the case of authentication and TLS
5142 failures, where the log has already been written. If all hosts defer a
5143 general message is written at the end. */
5144
5145 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5146 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5147 write_logs(host, first_addr->message, first_addr->basic_errno);
5148
5149 #ifndef DISABLE_EVENT
5150 if (rc == DEFER)
5151 deferred_event_raise(first_addr, host);
5152 #endif
5153
5154 /* If STARTTLS was accepted, but there was a failure in setting up the
5155 TLS session (usually a certificate screwup), and the host is not in
5156 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5157 TLS forcibly turned off. We have to start from scratch with a new SMTP
5158 connection. That's why the retry is done from here, not from within
5159 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5160 session, so the in-clear transmission after those errors, if permitted,
5161 happens inside smtp_deliver().] */
5162
5163 #ifdef SUPPORT_TLS
5164 if ( rc == DEFER
5165 && first_addr->basic_errno == ERRNO_TLSFAILURE
5166 && ob->tls_tempfail_tryclear
5167 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5168 )
5169 {
5170 log_write(0, LOG_MAIN,
5171 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5172 first_addr->message, host->name, host->address);
5173 first_addr = prepare_addresses(addrlist, host);
5174 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5175 &message_defer, TRUE);
5176 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5177 write_logs(host, first_addr->message, first_addr->basic_errno);
5178 # ifndef DISABLE_EVENT
5179 if (rc == DEFER)
5180 deferred_event_raise(first_addr, host);
5181 # endif
5182 }
5183 #endif /*SUPPORT_TLS*/
5184 }
5185
5186 /* Delivery attempt finished */
5187
5188 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5189 message_id, host->name, host->address, pistring, addrlist->address,
5190 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5191
5192 /* Release serialization if set up */
5193
5194 if (serialize_key) enq_end(serialize_key);
5195
5196 /* If the result is DEFER, or if a host retry record is known to exist, we
5197 need to add an item to the retry chain for updating the retry database
5198 at the end of delivery. We only need to add the item to the top address,
5199 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5200 for any other delivery attempts using the same address. (It is copied into
5201 the unusable tree at the outer level, so even if different address blocks
5202 contain the same address, it still won't get tried again.) */
5203
5204 if (rc == DEFER || retry_host_key)
5205 {
5206 int delete_flag = rc != DEFER ? rf_delete : 0;
5207 if (!retry_host_key)
5208 {
5209 BOOL incl_ip;
5210 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5211 US"retry_include_ip_address", ob->retry_include_ip_address,
5212 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5213 incl_ip = TRUE; /* error; use most-specific retry record */
5214
5215 retry_host_key = incl_ip
5216 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5217 : string_sprintf("T:%S%s", host->name, pistring);
5218 }
5219
5220 /* If a delivery of another message over an existing SMTP connection
5221 yields DEFER, we do NOT set up retry data for the host. This covers the
5222 case when there are delays in routing the addresses in the second message
5223 that are so long that the server times out. This is alleviated by not
5224 routing addresses that previously had routing defers when handling an
5225 existing connection, but even so, this case may occur (e.g. if a
5226 previously happily routed address starts giving routing defers). If the
5227 host is genuinely down, another non-continued message delivery will
5228 notice it soon enough. */
5229
5230 if (delete_flag != 0 || !continue_hostname)
5231 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5232
5233 /* We may have tried an expired host, if its retry time has come; ensure
5234 the status reflects the expiry for the benefit of any other addresses. */
5235
5236 if (rc == DEFER)
5237 {
5238 host->status = host_is_expired
5239 ? hstatus_unusable_expired : hstatus_unusable;
5240 host->why = hwhy_deferred;
5241 }
5242 }
5243
5244 /* If message_defer is set (host was OK, but every recipient got deferred
5245 because of some message-specific problem), or if that had happened
5246 previously so that a message retry key exists, add an appropriate item
5247 to the retry chain. Note that if there was a message defer but now there is
5248 a host defer, the message defer record gets deleted. That seems perfectly
5249 reasonable. Also, stop the message from being remembered as waiting
5250 for specific hosts. */
5251
5252 if (message_defer || retry_message_key)
5253 {
5254 int delete_flag = message_defer ? 0 : rf_delete;
5255 if (!retry_message_key)
5256 {
5257 BOOL incl_ip;
5258 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5259 US"retry_include_ip_address", ob->retry_include_ip_address,
5260 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5261 incl_ip = TRUE; /* error; use most-specific retry record */
5262
5263 retry_message_key = incl_ip
5264 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5265 message_id)
5266 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5267 }
5268 retry_add_item(addrlist, retry_message_key,
5269 rf_message | rf_host | delete_flag);
5270 update_waiting = FALSE;
5271 }
5272
5273 /* Any return other than DEFER (that is, OK or ERROR) means that the
5274 addresses have got their final statuses filled in for this host. In the OK
5275 case, see if any of them are deferred. */
5276
5277 if (rc == OK)
5278 for (address_item * addr = addrlist; addr; addr = addr->next)
5279 if (addr->transport_return == DEFER)
5280 {
5281 some_deferred = TRUE;
5282 break;
5283 }
5284
5285 /* If no addresses deferred or the result was ERROR, return. We do this for
5286 ERROR because a failing filter set-up or add_headers expansion is likely to
5287 fail for any host we try. */
5288
5289 if (rc == ERROR || (rc == OK && !some_deferred))
5290 {
5291 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5292 return TRUE; /* Each address has its status */
5293 }
5294
5295 /* If the result was DEFER or some individual addresses deferred, let
5296 the loop run to try other hosts with the deferred addresses, except for the
5297 case when we were trying to deliver down an existing channel and failed.
5298 Don't try any other hosts in this case. */
5299
5300 if (continue_hostname) break;
5301
5302 /* If the whole delivery, or some individual addresses, were deferred and
5303 there are more hosts that could be tried, do not count this host towards
5304 the hosts_max_try limit if the age of the message is greater than the
5305 maximum retry time for this host. This means we may try try all hosts,
5306 ignoring the limit, when messages have been around for some time. This is
5307 important because if we don't try all hosts, the address will never time
5308 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5309
5310 if ((rc == DEFER || some_deferred) && nexthost)
5311 {
5312 BOOL timedout;
5313 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5314
5315 if (retry && retry->rules)
5316 {
5317 retry_rule *last_rule;
5318 for (last_rule = retry->rules;
5319 last_rule->next;
5320 last_rule = last_rule->next);
5321 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5322 }
5323 else timedout = TRUE; /* No rule => timed out */
5324
5325 if (timedout)
5326 {
5327 unexpired_hosts_tried--;
5328 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5329 "hosts_max_try (message older than host's retry time)\n");
5330 }
5331 }
5332
5333 DEBUG(D_transport)
5334 {
5335 if (unexpired_hosts_tried >= ob->hosts_max_try)
5336 debug_printf("reached transport hosts_max_try limit %d\n",
5337 ob->hosts_max_try);
5338 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5339 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5340 ob->hosts_max_try_hardlimit);
5341 }
5342
5343 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5344 } /* End of loop for trying multiple hosts. */
5345
5346 /* If we failed to find a matching host in the list, for an already-open
5347 connection, just close it and start over with the list. This can happen
5348 for routing that changes from run to run, or big multi-IP sites with
5349 round-robin DNS. */
5350
5351 if (continue_hostname && !continue_host_tried)
5352 {
5353 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5354
5355 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5356 #ifdef SUPPORT_TLS
5357 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5358 transport */
5359 /*XXX doublecheck that! */
5360
5361 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5362 {
5363 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5364 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5365 cutthrough.cctx.tls_ctx = NULL;
5366 cutthrough.is_tls = FALSE;
5367 }
5368 else
5369 #else
5370 (void) write(fd, US"QUIT\r\n", 6);
5371 #endif
5372 (void) close(fd);
5373 cutthrough.cctx.sock = -1;
5374 continue_hostname = NULL;
5375 goto retry_non_continued;
5376 }
5377
5378 /* This is the end of the loop that repeats iff expired is TRUE and
5379 ob->delay_after_cutoff is FALSE. The second time round we will
5380 try those hosts that haven't been tried since the message arrived. */
5381
5382 DEBUG(D_transport)
5383 {
5384 debug_printf("all IP addresses skipped or deferred at least one address\n");
5385 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5386 debug_printf("retrying IP addresses not tried since message arrived\n");
5387 }
5388 }
5389
5390
5391 /* Get here if all IP addresses are skipped or defer at least one address. In
5392 MUA wrapper mode, this will happen only for connection or other non-message-
5393 specific failures. Force the delivery status for all addresses to FAIL. */
5394
5395 if (mua_wrapper)
5396 {
5397 for (address_item * addr = addrlist; addr; addr = addr->next)
5398 addr->transport_return = FAIL;
5399 goto END_TRANSPORT;
5400 }
5401
5402 /* In the normal, non-wrapper case, add a standard message to each deferred
5403 address if there hasn't been an error, that is, if it hasn't actually been
5404 tried this time. The variable "expired" will be FALSE if any deliveries were
5405 actually tried, or if there was at least one host that was not expired. That
5406 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5407 a delivery has been tried, an error code will be set, and the failing of the
5408 message is handled by the retry code later.
5409
5410 If queue_smtp is set, or this transport was called to send a subsequent message
5411 down an existing TCP/IP connection, and something caused the host not to be
5412 found, we end up here, but can detect these cases and handle them specially. */
5413
5414 for (address_item * addr = addrlist; addr; addr = addr->next)
5415 {
5416 /* If host is not NULL, it means that we stopped processing the host list
5417 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5418 means we need to behave as if some hosts were skipped because their retry
5419 time had not come. Specifically, this prevents the address from timing out.
5420 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5421 hosts were tried. */
5422
5423 if (host)
5424 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5425 {
5426 DEBUG(D_transport)
5427 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5428 "hosts were tried\n");
5429 }
5430 else
5431 {
5432 DEBUG(D_transport)
5433 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5434 setflag(addr, af_retry_skipped);
5435 }
5436
5437 if (f.queue_smtp) /* no deliveries attempted */
5438 {
5439 addr->transport_return = DEFER;
5440 addr->basic_errno = 0;
5441 addr->message = US"SMTP delivery explicitly queued";
5442 }
5443
5444 else if ( addr->transport_return == DEFER
5445 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5446 && !addr->message
5447 )
5448 {
5449 addr->basic_errno = ERRNO_HRETRY;
5450 if (continue_hostname)
5451 addr->message = US"no host found for existing SMTP connection";
5452 else if (expired)
5453 {
5454 setflag(addr, af_pass_message); /* This is not a security risk */
5455 addr->message = string_sprintf(
5456 "all hosts%s have been failing for a long time %s",
5457 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5458 ob->delay_after_cutoff
5459 ? US"(and retry time not reached)"
5460 : US"and were last tried after this message arrived");
5461
5462 /* If we are already using fallback hosts, or there are no fallback hosts
5463 defined, convert the result to FAIL to cause a bounce. */
5464
5465 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5466 addr->transport_return = FAIL;
5467 }
5468 else
5469 {
5470 const char * s;
5471 if (hosts_retry == hosts_total)
5472 s = "retry time not reached for any host%s";
5473 else if (hosts_fail == hosts_total)
5474 s = "all host address lookups%s failed permanently";
5475 else if (hosts_defer == hosts_total)
5476 s = "all host address lookups%s failed temporarily";
5477 else if (hosts_serial == hosts_total)
5478 s = "connection limit reached for all hosts%s";
5479 else if (hosts_fail+hosts_defer == hosts_total)
5480 s = "all host address lookups%s failed";
5481 else
5482 s = "some host address lookups failed and retry time "
5483 "not reached for other hosts or connection limit reached%s";
5484
5485 addr->message = string_sprintf(s,
5486 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5487 }
5488 }
5489 }
5490
5491 /* Update the database which keeps information about which messages are waiting
5492 for which hosts to become available. For some message-specific errors, the
5493 update_waiting flag is turned off because we don't want follow-on deliveries in
5494 those cases. If this transport instance is explicitly limited to one message
5495 per connection then follow-on deliveries are not possible and there's no need
5496 to create/update the per-transport wait-<transport_name> database. */
5497
5498 if (update_waiting && tblock->connection_max_messages != 1)
5499 transport_update_waiting(hostlist, tblock->name);
5500
5501 END_TRANSPORT:
5502
5503 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5504
5505 return TRUE; /* Each address has its status */
5506 }
5507
5508 #endif /*!MACRO_PREDEF*/
5509 /* vi: aw ai sw=2
5510 */
5511 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.