9ee1304bc3f9bbf862788e4c87cd386fbb354b1d
[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_FILTER_FAIL: /* Handle a failed filter process error;
597 can't send QUIT as we mustn't end the DATA. */
598 *message = string_sprintf("transport filter process failed (%d)%s",
599 more_errno,
600 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
601 return FALSE;
602
603 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
604 can't send QUIT as we mustn't end the DATA. */
605 *message =
606 string_sprintf("failed to expand headers_add or headers_remove: %s",
607 expand_string_message);
608 return FALSE;
609
610 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
611 *message = string_sprintf("failed to write a data block");
612 return FALSE;
613
614 #ifdef SUPPORT_I18N
615 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
616 *message = US"utf8 support required but not offered for forwarding";
617 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
618 return TRUE;
619 #endif
620 }
621
622 /* Handle error responses from the remote mailer. */
623
624 if (buffer[0] != 0)
625 {
626 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
627 "%s", pl, smtp_command, s = string_printing(buffer));
628 *pass_message = TRUE;
629 *yield = buffer[0];
630 return TRUE;
631 }
632
633 /* No data was read. If there is no errno, this must be the EOF (i.e.
634 connection closed) case, which causes deferral. An explicit connection reset
635 error has the same effect. Otherwise, put the host's identity in the message,
636 leaving the errno value to be interpreted as well. In all cases, we have to
637 assume the connection is now dead. */
638
639 if (*errno_value == 0 || *errno_value == ECONNRESET)
640 {
641 *errno_value = ERRNO_SMTPCLOSED;
642 *message = US string_sprintf("Remote host closed connection "
643 "in response to %s%s", pl, smtp_command);
644 }
645 else
646 *message = US string_sprintf("%s [%s]", host->name, host->address);
647
648 return FALSE;
649 }
650
651
652
653 /*************************************************
654 * Write error message to logs *
655 *************************************************/
656
657 /* This writes to the main log and to the message log.
658
659 Arguments:
660 host the current host
661 detail the current message (addr_item->message)
662 basic_errno the errno (addr_item->basic_errno)
663
664 Returns: nothing
665 */
666
667 static void
668 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
669 {
670 gstring * message = LOGGING(outgoing_port)
671 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
672 host->port == PORT_NONE ? 25 : host->port)
673 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
674
675 if (suffix)
676 {
677 message = string_fmt_append(message, ": %s", suffix);
678 if (basic_errno > 0)
679 message = string_fmt_append(message, ": %s", strerror(basic_errno));
680 }
681 else
682 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
683
684 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
685 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
686 }
687
688 static void
689 msglog_line(host_item * host, uschar * message)
690 {
691 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
692 host->name, host->address, message);
693 }
694
695
696
697 #ifndef DISABLE_EVENT
698 /*************************************************
699 * Post-defer action *
700 *************************************************/
701
702 /* This expands an arbitrary per-transport string.
703 It might, for example, be used to write to the database log.
704
705 Arguments:
706 addr the address item containing error information
707 host the current host
708
709 Returns: nothing
710 */
711
712 static void
713 deferred_event_raise(address_item *addr, host_item *host)
714 {
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
717 uschar * save_local;
718
719 if (!action)
720 return;
721
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
724
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
729
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
734
735 (void) event_raise(action, US"msg:host:defer",
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
747 }
748 #endif
749
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
753 static int
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756 {
757 uschar flushbuffer[4096];
758
759 while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766 return count;
767 }
768
769
770 /* Return boolean success */
771
772 static BOOL
773 smtp_reap_banner(smtp_context * sx)
774 {
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
779 #endif
780 return good_response;
781 }
782
783 static BOOL
784 smtp_reap_ehlo(smtp_context * sx)
785 {
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793 #endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
800 #endif
801 return TRUE;
802 }
803
804
805
806 #ifdef EXPERIMENTAL_PIPE_CONNECT
807 static uschar *
808 ehlo_cache_key(const smtp_context * sx)
809 {
810 host_item * host = sx->conn_args.host;
811 return Ustrchr(host->address, ':')
812 ? string_sprintf("[%s]:%d.EHLO", host->address,
813 host->port == PORT_NONE ? sx->port : host->port)
814 : string_sprintf("%s:%d.EHLO", host->address,
815 host->port == PORT_NONE ? sx->port : host->port);
816 }
817
818 static void
819 write_ehlo_cache_entry(const smtp_context * sx)
820 {
821 open_db dbblock, * dbm_file;
822
823 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
824 {
825 uschar * ehlo_resp_key = ehlo_cache_key(sx);
826 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
827
828 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
829 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
830 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
831
832 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
833 dbfn_close(dbm_file);
834 }
835 }
836
837 static void
838 invalidate_ehlo_cache_entry(smtp_context * sx)
839 {
840 open_db dbblock, * dbm_file;
841
842 if ( sx->early_pipe_active
843 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
844 {
845 uschar * ehlo_resp_key = ehlo_cache_key(sx);
846 dbfn_delete(dbm_file, ehlo_resp_key);
847 dbfn_close(dbm_file);
848 }
849 }
850
851 static BOOL
852 read_ehlo_cache_entry(smtp_context * sx)
853 {
854 open_db dbblock;
855 open_db * dbm_file;
856
857 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
858 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
859 else
860 {
861 uschar * ehlo_resp_key = ehlo_cache_key(sx);
862 dbdata_ehlo_resp * er;
863
864 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
865 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
866 else if (time(NULL) - er->time_stamp > retry_data_expire)
867 {
868 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
869 dbfn_close(dbm_file);
870 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
871 dbfn_delete(dbm_file, ehlo_resp_key);
872 }
873 else
874 {
875 sx->ehlo_resp = er->data;
876 dbfn_close(dbm_file);
877 DEBUG(D_transport) debug_printf(
878 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
879 er->data.cleartext_features, er->data.crypted_features);
880 return TRUE;
881 }
882 dbfn_close(dbm_file);
883 }
884 return FALSE;
885 }
886
887
888
889 /* Return an auths bitmap for the set of AUTH methods offered by the server
890 which match our authenticators. */
891
892 static unsigned short
893 study_ehlo_auths(smtp_context * sx)
894 {
895 uschar * names;
896 auth_instance * au;
897 uschar authnum;
898 unsigned short authbits = 0;
899
900 if (!sx->esmtp) return 0;
901 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
902 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
903 expand_nmax = -1; /* reset */
904 names = string_copyn(expand_nstring[1], expand_nlength[1]);
905
906 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
907 {
908 const uschar * list = names;
909 int sep = ' ';
910 uschar name[32];
911
912 while (string_nextinlist(&list, &sep, name, sizeof(name)))
913 if (strcmpic(au->public_name, name) == 0)
914 { authbits |= BIT(authnum); break; }
915 }
916
917 DEBUG(D_transport)
918 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
919 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
920
921 if (tls_out.active.sock >= 0)
922 sx->ehlo_resp.crypted_auths = authbits;
923 else
924 sx->ehlo_resp.cleartext_auths = authbits;
925 return authbits;
926 }
927
928
929
930
931 /* Wait for and check responses for early-pipelining.
932
933 Called from the lower-level smtp_read_response() function
934 used for general code that assume synchronisation, if context
935 flags indicate outstanding early-pipelining commands. Also
936 called fom sync_responses() which handles pipelined commands.
937
938 Arguments:
939 sx smtp connection context
940 countp number of outstanding responses, adjusted on return
941
942 Return:
943 OK all well
944 FAIL SMTP error in response
945 */
946 int
947 smtp_reap_early_pipe(smtp_context * sx, int * countp)
948 {
949 BOOL pending_BANNER = sx->pending_BANNER;
950 BOOL pending_EHLO = sx->pending_EHLO;
951
952 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
953 sx->pending_EHLO = FALSE;
954
955 if (pending_BANNER)
956 {
957 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
958 (*countp)--;
959 if (!smtp_reap_banner(sx))
960 {
961 DEBUG(D_transport) debug_printf("bad banner\n");
962 goto fail;
963 }
964 }
965
966 if (pending_EHLO)
967 {
968 unsigned peer_offered;
969 unsigned short authbits = 0, * ap;
970
971 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
972 (*countp)--;
973 if (!smtp_reap_ehlo(sx))
974 {
975 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
976 goto fail;
977 }
978
979 /* Compare the actual EHLO response to the cached value we assumed;
980 on difference, dump or rewrite the cache and arrange for a retry. */
981
982 ap = tls_out.active.sock < 0
983 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
984
985 peer_offered = ehlo_response(sx->buffer,
986 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
987 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
988 | OPTION_UTF8 | OPTION_EARLY_PIPE
989 );
990 if ( peer_offered != sx->peer_offered
991 || (authbits = study_ehlo_auths(sx)) != *ap)
992 {
993 HDEBUG(D_transport)
994 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
995 tls_out.active.sock < 0 ? "cleartext" : "crypted",
996 sx->peer_offered, *ap, peer_offered, authbits);
997 *(tls_out.active.sock < 0
998 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
999 *ap = authbits;
1000 if (peer_offered & OPTION_EARLY_PIPE)
1001 write_ehlo_cache_entry(sx);
1002 else
1003 invalidate_ehlo_cache_entry(sx);
1004
1005 return OK; /* just carry on */
1006 }
1007 }
1008 return OK;
1009
1010 fail:
1011 invalidate_ehlo_cache_entry(sx);
1012 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1013 return FAIL;
1014 }
1015 #endif
1016
1017
1018 /*************************************************
1019 * Synchronize SMTP responses *
1020 *************************************************/
1021
1022 /* This function is called from smtp_deliver() to receive SMTP responses from
1023 the server, and match them up with the commands to which they relate. When
1024 PIPELINING is not in use, this function is called after every command, and is
1025 therefore somewhat over-engineered, but it is simpler to use a single scheme
1026 that works both with and without PIPELINING instead of having two separate sets
1027 of code.
1028
1029 The set of commands that are buffered up with pipelining may start with MAIL
1030 and may end with DATA; in between are RCPT commands that correspond to the
1031 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1032 etc.) are never buffered.
1033
1034 Errors after MAIL or DATA abort the whole process leaving the response in the
1035 buffer. After MAIL, pending responses are flushed, and the original command is
1036 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1037 permitted to reject some recipient addresses while accepting others. However
1038 certain errors clearly abort the whole process. Set the value in
1039 transport_return to PENDING_OK if the address is accepted. If there is a
1040 subsequent general error, it will get reset accordingly. If not, it will get
1041 converted to OK at the end.
1042
1043 Arguments:
1044 sx smtp connection context
1045 count the number of responses to read
1046 pending_DATA 0 if last command sent was not DATA
1047 +1 if previously had a good recipient
1048 -1 if not previously had a good recipient
1049
1050 Returns: 3 if at least one address had 2xx and one had 5xx
1051 2 if at least one address had 5xx but none had 2xx
1052 1 if at least one host had a 2xx response, but none had 5xx
1053 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1054 -1 timeout while reading RCPT response
1055 -2 I/O or other non-response error for RCPT
1056 -3 DATA or MAIL failed - errno and buffer set
1057 -4 banner or EHLO failed (early-pipelining)
1058 */
1059
1060 static int
1061 sync_responses(smtp_context * sx, int count, int pending_DATA)
1062 {
1063 address_item * addr = sx->sync_addr;
1064 smtp_transport_options_block * ob = sx->conn_args.ob;
1065 int yield = 0;
1066
1067 #ifdef EXPERIMENTAL_PIPE_CONNECT
1068 if (smtp_reap_early_pipe(sx, &count) != OK)
1069 return -4;
1070 #endif
1071
1072 /* Handle the response for a MAIL command. On error, reinstate the original
1073 command in big_buffer for error message use, and flush any further pending
1074 responses before returning, except after I/O errors and timeouts. */
1075
1076 if (sx->pending_MAIL)
1077 {
1078 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1079 count--;
1080 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1081 '2', ob->command_timeout))
1082 {
1083 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1084 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1085 if (errno == 0 && sx->buffer[0] != 0)
1086 {
1087 int save_errno = 0;
1088 if (sx->buffer[0] == '4')
1089 {
1090 save_errno = ERRNO_MAIL4XX;
1091 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1092 }
1093 count = smtp_discard_responses(sx, ob, count);
1094 errno = save_errno;
1095 }
1096
1097 if (pending_DATA) count--; /* Number of RCPT responses to come */
1098 while (count-- > 0) /* Mark any pending addrs with the host used */
1099 {
1100 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1101 addr->host_used = sx->conn_args.host;
1102 addr = addr->next;
1103 }
1104 return -3;
1105 }
1106 }
1107
1108 if (pending_DATA) count--; /* Number of RCPT responses to come */
1109
1110 /* Read and handle the required number of RCPT responses, matching each one up
1111 with an address by scanning for the next address whose status is PENDING_DEFER.
1112 */
1113
1114 while (count-- > 0)
1115 {
1116 while (addr->transport_return != PENDING_DEFER)
1117 if (!(addr = addr->next))
1118 return -2;
1119
1120 /* The address was accepted */
1121 addr->host_used = sx->conn_args.host;
1122
1123 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1124 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1125 '2', ob->command_timeout))
1126 {
1127 yield |= 1;
1128 addr->transport_return = PENDING_OK;
1129
1130 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1131 ensure that any address-specific retry record is expunged. We do this both
1132 for the basic key and for the version that also includes the sender. */
1133
1134 if (testflag(addr, af_dr_retry_exists))
1135 {
1136 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1137 sender_address);
1138 retry_add_item(addr, altkey, rf_delete);
1139 retry_add_item(addr, addr->address_retry_key, rf_delete);
1140 }
1141 }
1142
1143 /* Timeout while reading the response */
1144
1145 else if (errno == ETIMEDOUT)
1146 {
1147 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1148 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1149 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1150 retry_add_item(addr, addr->address_retry_key, 0);
1151 update_waiting = FALSE;
1152 return -1;
1153 }
1154
1155 /* Handle other errors in obtaining an SMTP response by returning -1. This
1156 will cause all the addresses to be deferred. Restore the SMTP command in
1157 big_buffer for which we are checking the response, so the error message
1158 makes sense. */
1159
1160 else if (errno != 0 || sx->buffer[0] == 0)
1161 {
1162 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1163 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1164 return -2;
1165 }
1166
1167 /* Handle SMTP permanent and temporary response codes. */
1168
1169 else
1170 {
1171 addr->message =
1172 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1173 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1174 string_printing(sx->buffer));
1175 setflag(addr, af_pass_message);
1176 if (!sx->verify)
1177 msglog_line(sx->conn_args.host, addr->message);
1178
1179 /* The response was 5xx */
1180
1181 if (sx->buffer[0] == '5')
1182 {
1183 addr->transport_return = FAIL;
1184 yield |= 2;
1185 }
1186
1187 /* The response was 4xx */
1188
1189 else
1190 {
1191 addr->transport_return = DEFER;
1192 addr->basic_errno = ERRNO_RCPT4XX;
1193 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1194
1195 if (!sx->verify)
1196 {
1197 #ifndef DISABLE_EVENT
1198 event_defer_errno = addr->more_errno;
1199 msg_event_raise(US"msg:rcpt:host:defer", addr);
1200 #endif
1201
1202 /* Log temporary errors if there are more hosts to be tried.
1203 If not, log this last one in the == line. */
1204
1205 if (sx->conn_args.host->next)
1206 if (LOGGING(outgoing_port))
1207 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1208 sx->conn_args.host->address,
1209 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1210 else
1211 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1212 sx->conn_args.host->address, addr->message);
1213
1214 #ifndef DISABLE_EVENT
1215 else
1216 msg_event_raise(US"msg:rcpt:defer", addr);
1217 #endif
1218
1219 /* Do not put this message on the list of those waiting for specific
1220 hosts, as otherwise it is likely to be tried too often. */
1221
1222 update_waiting = FALSE;
1223
1224 /* Add a retry item for the address so that it doesn't get tried again
1225 too soon. If address_retry_include_sender is true, add the sender address
1226 to the retry key. */
1227
1228 retry_add_item(addr,
1229 ob->address_retry_include_sender
1230 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1231 : addr->address_retry_key,
1232 0);
1233 }
1234 }
1235 }
1236 } /* Loop for next RCPT response */
1237
1238 /* Update where to start at for the next block of responses, unless we
1239 have already handled all the addresses. */
1240
1241 if (addr) sx->sync_addr = addr->next;
1242
1243 /* Handle a response to DATA. If we have not had any good recipients, either
1244 previously or in this block, the response is ignored. */
1245
1246 if (pending_DATA != 0)
1247 {
1248 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1249 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1250 '3', ob->command_timeout))
1251 {
1252 int code;
1253 uschar *msg;
1254 BOOL pass_message;
1255 if (pending_DATA > 0 || (yield & 1) != 0)
1256 {
1257 if (errno == 0 && sx->buffer[0] == '4')
1258 {
1259 errno = ERRNO_DATA4XX;
1260 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1261 }
1262 return -3;
1263 }
1264 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1265 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1266 "is in use and there were no good recipients\n", msg);
1267 }
1268 }
1269
1270 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1271 present) received 3xx. If any RCPTs were handled and yielded anything other
1272 than 4xx, yield will be set non-zero. */
1273
1274 return yield;
1275 }
1276
1277
1278
1279
1280
1281 /* Try an authenticator's client entry */
1282
1283 static int
1284 try_authenticator(smtp_context * sx, auth_instance * au)
1285 {
1286 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1287 host_item * host = sx->conn_args.host; /* host to deliver to */
1288 int rc;
1289
1290 sx->outblock.authenticating = TRUE;
1291 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1292 sx->buffer, sizeof(sx->buffer));
1293 sx->outblock.authenticating = FALSE;
1294 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1295
1296 /* A temporary authentication failure must hold up delivery to
1297 this host. After a permanent authentication failure, we carry on
1298 to try other authentication methods. If all fail hard, try to
1299 deliver the message unauthenticated unless require_auth was set. */
1300
1301 switch(rc)
1302 {
1303 case OK:
1304 f.smtp_authenticated = TRUE; /* stops the outer loop */
1305 client_authenticator = au->name;
1306 if (au->set_client_id)
1307 client_authenticated_id = expand_string(au->set_client_id);
1308 break;
1309
1310 /* Failure after writing a command */
1311
1312 case FAIL_SEND:
1313 return FAIL_SEND;
1314
1315 /* Failure after reading a response */
1316
1317 case FAIL:
1318 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1319 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1320 au->name, host->name, host->address, sx->buffer);
1321 break;
1322
1323 /* Failure by some other means. In effect, the authenticator
1324 decided it wasn't prepared to handle this case. Typically this
1325 is the result of "fail" in an expansion string. Do we need to
1326 log anything here? Feb 2006: a message is now put in the buffer
1327 if logging is required. */
1328
1329 case CANCELLED:
1330 if (*sx->buffer != 0)
1331 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1332 "authentication H=%s [%s] %s", au->name, host->name,
1333 host->address, sx->buffer);
1334 break;
1335
1336 /* Internal problem, message in buffer. */
1337
1338 case ERROR:
1339 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1340 DEFER, FALSE);
1341 return ERROR;
1342 }
1343 return OK;
1344 }
1345
1346
1347
1348
1349 /* Do the client side of smtp-level authentication.
1350
1351 Arguments:
1352 sx smtp connection context
1353
1354 sx->buffer should have the EHLO response from server (gets overwritten)
1355
1356 Returns:
1357 OK Success, or failed (but not required): global "smtp_authenticated" set
1358 DEFER Failed authentication (and was required)
1359 ERROR Internal problem
1360
1361 FAIL_SEND Failed communications - transmit
1362 FAIL - response
1363 */
1364
1365 static int
1366 smtp_auth(smtp_context * sx)
1367 {
1368 host_item * host = sx->conn_args.host; /* host to deliver to */
1369 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1370 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1371 #ifdef EXPERIMENTAL_PIPE_CONNECT
1372 unsigned short authbits = tls_out.active.sock >= 0
1373 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1374 #endif
1375 uschar * fail_reason = US"server did not advertise AUTH support";
1376
1377 f.smtp_authenticated = FALSE;
1378 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1379
1380 if (!regex_AUTH)
1381 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1382
1383 /* Is the server offering AUTH? */
1384
1385 if ( sx->esmtp
1386 &&
1387 #ifdef EXPERIMENTAL_PIPE_CONNECT
1388 sx->early_pipe_active ? authbits
1389 :
1390 #endif
1391 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1392 )
1393 {
1394 uschar * names = NULL;
1395 expand_nmax = -1; /* reset */
1396
1397 #ifdef EXPERIMENTAL_PIPE_CONNECT
1398 if (!sx->early_pipe_active)
1399 #endif
1400 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1401
1402 /* Must not do this check until after we have saved the result of the
1403 regex match above as the check could be another RE. */
1404
1405 if ( require_auth == OK
1406 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1407 {
1408 auth_instance * au;
1409
1410 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1411 fail_reason = US"no common mechanisms were found";
1412
1413 #ifdef EXPERIMENTAL_PIPE_CONNECT
1414 if (sx->early_pipe_active)
1415 {
1416 /* Scan our authenticators (which support use by a client and were offered
1417 by the server (checked at cache-write time)), not suppressed by
1418 client_condition. If one is found, attempt to authenticate by calling its
1419 client function. We are limited to supporting up to 16 authenticator
1420 public-names by the number of bits in a short. */
1421
1422 uschar bitnum;
1423 int rc;
1424
1425 for (bitnum = 0, au = auths;
1426 !f.smtp_authenticated && au && bitnum < 16;
1427 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1428 {
1429 if ( au->client_condition
1430 && !expand_check_condition(au->client_condition, au->name,
1431 US"client authenticator"))
1432 {
1433 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1434 au->name, "client_condition is false");
1435 continue;
1436 }
1437
1438 /* Found data for a listed mechanism. Call its client entry. Set
1439 a flag in the outblock so that data is overwritten after sending so
1440 that reflections don't show it. */
1441
1442 fail_reason = US"authentication attempt(s) failed";
1443
1444 if ((rc = try_authenticator(sx, au)) != OK)
1445 return rc;
1446 }
1447 }
1448 else
1449 #endif
1450
1451 /* Scan the configured authenticators looking for one which is configured
1452 for use as a client, which is not suppressed by client_condition, and
1453 whose name matches an authentication mechanism supported by the server.
1454 If one is found, attempt to authenticate by calling its client function.
1455 */
1456
1457 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1458 {
1459 uschar *p = names;
1460
1461 if ( !au->client
1462 || ( au->client_condition
1463 && !expand_check_condition(au->client_condition, au->name,
1464 US"client authenticator")))
1465 {
1466 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1467 au->name,
1468 (au->client)? "client_condition is false" :
1469 "not configured as a client");
1470 continue;
1471 }
1472
1473 /* Loop to scan supported server mechanisms */
1474
1475 while (*p)
1476 {
1477 int len = Ustrlen(au->public_name);
1478 int rc;
1479
1480 while (isspace(*p)) p++;
1481
1482 if (strncmpic(au->public_name, p, len) != 0 ||
1483 (p[len] != 0 && !isspace(p[len])))
1484 {
1485 while (*p != 0 && !isspace(*p)) p++;
1486 continue;
1487 }
1488
1489 /* Found data for a listed mechanism. Call its client entry. Set
1490 a flag in the outblock so that data is overwritten after sending so
1491 that reflections don't show it. */
1492
1493 fail_reason = US"authentication attempt(s) failed";
1494
1495 if ((rc = try_authenticator(sx, au)) != OK)
1496 return rc;
1497
1498 break; /* If not authenticated, try next authenticator */
1499 } /* Loop for scanning supported server mechanisms */
1500 } /* Loop for further authenticators */
1501 }
1502 }
1503
1504 /* If we haven't authenticated, but are required to, give up. */
1505
1506 if (require_auth == OK && !f.smtp_authenticated)
1507 {
1508 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1509 string_sprintf("authentication required but %s", fail_reason), DEFER,
1510 FALSE);
1511 return DEFER;
1512 }
1513
1514 return OK;
1515 }
1516
1517
1518 /* Construct AUTH appendix string for MAIL TO */
1519 /*
1520 Arguments
1521 buffer to build string
1522 addrlist chain of potential addresses to deliver
1523 ob transport options
1524
1525 Globals f.smtp_authenticated
1526 client_authenticated_sender
1527 Return True on error, otherwise buffer has (possibly empty) terminated string
1528 */
1529
1530 BOOL
1531 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1532 smtp_transport_options_block *ob)
1533 {
1534 uschar *local_authenticated_sender = authenticated_sender;
1535
1536 #ifdef notdef
1537 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1538 #endif
1539
1540 if (ob->authenticated_sender != NULL)
1541 {
1542 uschar *new = expand_string(ob->authenticated_sender);
1543 if (new == NULL)
1544 {
1545 if (!f.expand_string_forcedfail)
1546 {
1547 uschar *message = string_sprintf("failed to expand "
1548 "authenticated_sender: %s", expand_string_message);
1549 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1550 return TRUE;
1551 }
1552 }
1553 else if (new[0] != 0) local_authenticated_sender = new;
1554 }
1555
1556 /* Add the authenticated sender address if present */
1557
1558 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1559 local_authenticated_sender != NULL)
1560 {
1561 string_format(buffer, bufsize, " AUTH=%s",
1562 auth_xtextencode(local_authenticated_sender,
1563 Ustrlen(local_authenticated_sender)));
1564 client_authenticated_sender = string_copy(local_authenticated_sender);
1565 }
1566 else
1567 *buffer= 0;
1568
1569 return FALSE;
1570 }
1571
1572
1573
1574 #ifdef SUPPORT_DANE
1575 /* Lookup TLSA record for host/port.
1576 Return: OK success with dnssec; DANE mode
1577 DEFER Do not use this host now, may retry later
1578 FAIL_FORCED No TLSA record; DANE not usable
1579 FAIL Do not use this connection
1580 */
1581
1582 int
1583 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1584 {
1585 /* move this out to host.c given the similarity to dns_lookup() ? */
1586 uschar buffer[300];
1587 const uschar * fullname = buffer;
1588 int rc;
1589 BOOL sec;
1590
1591 /* TLSA lookup string */
1592 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1593
1594 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1595 sec = dns_is_secure(dnsa);
1596 DEBUG(D_transport)
1597 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1598
1599 switch (rc)
1600 {
1601 case DNS_AGAIN:
1602 return DEFER; /* just defer this TLS'd conn */
1603
1604 case DNS_SUCCEED:
1605 if (sec)
1606 {
1607 DEBUG(D_transport)
1608 {
1609 dns_scan dnss;
1610 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1611 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1612 if (rr->type == T_TLSA && rr->size > 3)
1613 {
1614 uint16_t payload_length = rr->size - 3;
1615 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1616
1617 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1618 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1619 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1620 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1621 sp += sprintf(CS sp, "%02x", *p++);
1622
1623 debug_printf(" %s\n", s);
1624 }
1625 }
1626 return OK;
1627 }
1628 log_write(0, LOG_MAIN,
1629 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1630 /*FALLTRHOUGH*/
1631
1632 case DNS_NODATA: /* no TLSA RR for this lookup */
1633 case DNS_NOMATCH: /* no records at all for this lookup */
1634 return dane_required ? FAIL : FAIL_FORCED;
1635
1636 default:
1637 case DNS_FAIL:
1638 return dane_required ? FAIL : DEFER;
1639 }
1640 }
1641 #endif
1642
1643
1644
1645 typedef struct smtp_compare_s
1646 {
1647 uschar *current_sender_address;
1648 struct transport_instance *tblock;
1649 } smtp_compare_t;
1650
1651
1652 /* Create a unique string that identifies this message, it is based on
1653 sender_address, helo_data and tls_certificate if enabled.
1654 */
1655
1656 static uschar *
1657 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1658 {
1659 address_item * addr1;
1660 uschar * if1 = US"";
1661 uschar * helo1 = US"";
1662 #ifdef SUPPORT_TLS
1663 uschar * tlsc1 = US"";
1664 #endif
1665 uschar * save_sender_address = sender_address;
1666 uschar * local_identity = NULL;
1667 smtp_transport_options_block * ob = SOB tblock->options_block;
1668
1669 sender_address = sender;
1670
1671 addr1 = deliver_make_addr (sender, TRUE);
1672 deliver_set_expansions(addr1);
1673
1674 if (ob->interface)
1675 if1 = expand_string(ob->interface);
1676
1677 if (ob->helo_data)
1678 helo1 = expand_string(ob->helo_data);
1679
1680 #ifdef SUPPORT_TLS
1681 if (ob->tls_certificate)
1682 tlsc1 = expand_string(ob->tls_certificate);
1683 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1684 #else
1685 local_identity = string_sprintf ("%s^%s", if1, helo1);
1686 #endif
1687
1688 deliver_set_expansions(NULL);
1689 sender_address = save_sender_address;
1690
1691 return local_identity;
1692 }
1693
1694
1695
1696 /* This routine is a callback that is called from transport_check_waiting.
1697 This function will evaluate the incoming message versus the previous
1698 message. If the incoming message is using a different local identity then
1699 we will veto this new message. */
1700
1701 static BOOL
1702 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1703 {
1704 uschar * message_local_identity,
1705 * current_local_identity,
1706 * new_sender_address;
1707
1708 current_local_identity =
1709 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1710
1711 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1712 return 0;
1713
1714 message_local_identity =
1715 smtp_local_identity(new_sender_address, s_compare->tblock);
1716
1717 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1718 }
1719
1720
1721
1722 static unsigned
1723 ehlo_response(uschar * buf, unsigned checks)
1724 {
1725 size_t bsize = Ustrlen(buf);
1726
1727 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1728
1729 #ifdef SUPPORT_TLS
1730 # ifdef EXPERIMENTAL_REQUIRETLS
1731 if ( checks & OPTION_REQUIRETLS
1732 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1733 # endif
1734 checks &= ~OPTION_REQUIRETLS;
1735
1736 if ( checks & OPTION_TLS
1737 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1738 #endif
1739 checks &= ~OPTION_TLS;
1740
1741 if ( checks & OPTION_IGNQ
1742 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1743 PCRE_EOPT, NULL, 0) < 0)
1744 checks &= ~OPTION_IGNQ;
1745
1746 if ( checks & OPTION_CHUNKING
1747 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1748 checks &= ~OPTION_CHUNKING;
1749
1750 #ifndef DISABLE_PRDR
1751 if ( checks & OPTION_PRDR
1752 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1753 #endif
1754 checks &= ~OPTION_PRDR;
1755
1756 #ifdef SUPPORT_I18N
1757 if ( checks & OPTION_UTF8
1758 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1759 #endif
1760 checks &= ~OPTION_UTF8;
1761
1762 if ( checks & OPTION_DSN
1763 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1764 checks &= ~OPTION_DSN;
1765
1766 if ( checks & OPTION_PIPE
1767 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1768 PCRE_EOPT, NULL, 0) < 0)
1769 checks &= ~OPTION_PIPE;
1770
1771 if ( checks & OPTION_SIZE
1772 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1773 checks &= ~OPTION_SIZE;
1774
1775 #ifdef EXPERIMENTAL_PIPE_CONNECT
1776 if ( checks & OPTION_EARLY_PIPE
1777 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1778 PCRE_EOPT, NULL, 0) < 0)
1779 #endif
1780 checks &= ~OPTION_EARLY_PIPE;
1781
1782 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1783 return checks;
1784 }
1785
1786
1787
1788 /* Callback for emitting a BDAT data chunk header.
1789
1790 If given a nonzero size, first flush any buffered SMTP commands
1791 then emit the command.
1792
1793 Reap previous SMTP command responses if requested, and always reap
1794 the response from a previous BDAT command.
1795
1796 Args:
1797 tctx transport context
1798 chunk_size value for SMTP BDAT command
1799 flags
1800 tc_chunk_last add LAST option to SMTP BDAT command
1801 tc_reap_prev reap response to previous SMTP commands
1802
1803 Returns: OK or ERROR
1804 */
1805
1806 static int
1807 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1808 unsigned flags)
1809 {
1810 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1811 smtp_context * sx = tctx->smtp_context;
1812 int cmd_count = 0;
1813 int prev_cmd_count;
1814
1815 /* Write SMTP chunk header command. If not reaping responses, note that
1816 there may be more writes (like, the chunk data) done soon. */
1817
1818 if (chunk_size > 0)
1819 {
1820 #ifdef EXPERIMENTAL_PIPE_CONNECT
1821 BOOL new_conn = !!(sx->outblock.conn_args);
1822 #endif
1823 if((cmd_count = smtp_write_command(sx,
1824 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1825 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1826 ) < 0) return ERROR;
1827 if (flags & tc_chunk_last)
1828 data_command = string_copy(big_buffer); /* Save for later error message */
1829 #ifdef EXPERIMENTAL_PIPE_CONNECT
1830 /* That command write could have been the one that made the connection.
1831 Copy the fd from the client conn ctx (smtp transport specific) to the
1832 generic transport ctx. */
1833
1834 if (new_conn)
1835 tctx->u.fd = sx->outblock.cctx->sock;
1836 #endif
1837 }
1838
1839 prev_cmd_count = cmd_count += sx->cmd_count;
1840
1841 /* Reap responses for any previous, but not one we just emitted */
1842
1843 if (chunk_size > 0)
1844 prev_cmd_count--;
1845 if (sx->pending_BDAT)
1846 prev_cmd_count--;
1847
1848 if (flags & tc_reap_prev && prev_cmd_count > 0)
1849 {
1850 DEBUG(D_transport) debug_printf("look for %d responses"
1851 " for previous pipelined cmds\n", prev_cmd_count);
1852
1853 switch(sync_responses(sx, prev_cmd_count, 0))
1854 {
1855 case 1: /* 2xx (only) => OK */
1856 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1857 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1858 case 0: break; /* No 2xx or 5xx, but no probs */
1859
1860 case -1: /* Timeout on RCPT */
1861 #ifdef EXPERIMENTAL_PIPE_CONNECT
1862 case -4: /* non-2xx for pipelined banner or EHLO */
1863 #endif
1864 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1865 }
1866 cmd_count = 1;
1867 if (!sx->pending_BDAT)
1868 pipelining_active = FALSE;
1869 }
1870
1871 /* Reap response for an outstanding BDAT */
1872
1873 if (sx->pending_BDAT)
1874 {
1875 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1876
1877 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1878 ob->command_timeout))
1879 {
1880 if (errno == 0 && sx->buffer[0] == '4')
1881 {
1882 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1883 sx->addrlist->more_errno |=
1884 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1885 }
1886 return ERROR;
1887 }
1888 cmd_count--;
1889 sx->pending_BDAT = FALSE;
1890 pipelining_active = FALSE;
1891 }
1892 else if (chunk_size > 0)
1893 sx->pending_BDAT = TRUE;
1894
1895
1896 sx->cmd_count = cmd_count;
1897 return OK;
1898 }
1899
1900
1901
1902
1903
1904 /*************************************************
1905 * Make connection for given message *
1906 *************************************************/
1907
1908 /*
1909 Arguments:
1910 ctx connection context
1911 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1912 a second attempt after TLS initialization fails
1913
1914 Returns: OK - the connection was made and the delivery attempted;
1915 fd is set in the conn context, tls_out set up.
1916 DEFER - the connection could not be made, or something failed
1917 while setting up the SMTP session, or there was a
1918 non-message-specific error, such as a timeout.
1919 ERROR - helo_data or add_headers or authenticated_sender is
1920 specified for this transport, and the string failed
1921 to expand
1922 */
1923 int
1924 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1925 {
1926 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1927 dns_answer tlsa_dnsa;
1928 #endif
1929 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1930 BOOL pass_message = FALSE;
1931 uschar * message = NULL;
1932 int yield = OK;
1933 int rc;
1934
1935 sx->conn_args.ob = ob;
1936
1937 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1938 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1939 sx->ok = FALSE;
1940 sx->send_rset = TRUE;
1941 sx->send_quit = TRUE;
1942 sx->setting_up = TRUE;
1943 sx->esmtp = TRUE;
1944 sx->esmtp_sent = FALSE;
1945 #ifdef SUPPORT_I18N
1946 sx->utf8_needed = FALSE;
1947 #endif
1948 sx->dsn_all_lasthop = TRUE;
1949 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1950 sx->dane = FALSE;
1951 sx->dane_required =
1952 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1953 #endif
1954 #ifdef EXPERIMENTAL_PIPE_CONNECT
1955 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1956 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1957 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1958 #endif
1959
1960 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1961 sx->peer_offered = 0;
1962 sx->avoid_option = 0;
1963 sx->igquotstr = US"";
1964 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1965 #ifdef EXPERIMENTAL_DSN_INFO
1966 sx->smtp_greeting = NULL;
1967 sx->helo_response = NULL;
1968 #endif
1969
1970 smtp_command = US"initial connection";
1971 sx->buffer[0] = '\0';
1972
1973 /* Set up the buffer for reading SMTP response packets. */
1974
1975 sx->inblock.buffer = sx->inbuffer;
1976 sx->inblock.buffersize = sizeof(sx->inbuffer);
1977 sx->inblock.ptr = sx->inbuffer;
1978 sx->inblock.ptrend = sx->inbuffer;
1979
1980 /* Set up the buffer for holding SMTP commands while pipelining */
1981
1982 sx->outblock.buffer = sx->outbuffer;
1983 sx->outblock.buffersize = sizeof(sx->outbuffer);
1984 sx->outblock.ptr = sx->outbuffer;
1985 sx->outblock.cmd_count = 0;
1986 sx->outblock.authenticating = FALSE;
1987 sx->outblock.conn_args = NULL;
1988
1989 /* Reset the parameters of a TLS session. */
1990
1991 tls_out.bits = 0;
1992 tls_out.cipher = NULL; /* the one we may use for this transport */
1993 tls_out.ourcert = NULL;
1994 tls_out.peercert = NULL;
1995 tls_out.peerdn = NULL;
1996 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1997 tls_out.sni = NULL;
1998 #endif
1999 tls_out.ocsp = OCSP_NOT_REQ;
2000
2001 /* Flip the legacy TLS-related variables over to the outbound set in case
2002 they're used in the context of the transport. Don't bother resetting
2003 afterward (when being used by a transport) as we're in a subprocess.
2004 For verify, unflipped once the callout is dealt with */
2005
2006 tls_modify_variables(&tls_out);
2007
2008 #ifndef SUPPORT_TLS
2009 if (sx->smtps)
2010 {
2011 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2012 DEFER, FALSE);
2013 return ERROR;
2014 }
2015 #endif
2016
2017 /* Make a connection to the host if this isn't a continued delivery, and handle
2018 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2019 specially so they can be identified for retries. */
2020
2021 if (!continue_hostname)
2022 {
2023 if (sx->verify)
2024 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2025
2026 /* Get the actual port the connection will use, into sx->conn_args.host */
2027
2028 smtp_port_for_connect(sx->conn_args.host, sx->port);
2029
2030 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2031 /* Do TLSA lookup for DANE */
2032 {
2033 tls_out.dane_verified = FALSE;
2034 tls_out.tlsa_usage = 0;
2035
2036 if (sx->conn_args.host->dnssec == DS_YES)
2037 {
2038 if( sx->dane_required
2039 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2040 )
2041 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2042 {
2043 case OK: sx->dane = TRUE;
2044 ob->tls_tempfail_tryclear = FALSE;
2045 break;
2046 case FAIL_FORCED: break;
2047 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2048 string_sprintf("DANE error: tlsa lookup %s",
2049 rc_to_string(rc)),
2050 rc, FALSE);
2051 # ifndef DISABLE_EVENT
2052 (void) event_raise(sx->conn_args.tblock->event_action,
2053 US"dane:fail", sx->dane_required
2054 ? US"dane-required" : US"dnssec-invalid");
2055 # endif
2056 return rc;
2057 }
2058 }
2059 else if (sx->dane_required)
2060 {
2061 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2062 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2063 FAIL, FALSE);
2064 # ifndef DISABLE_EVENT
2065 (void) event_raise(sx->conn_args.tblock->event_action,
2066 US"dane:fail", US"dane-required");
2067 # endif
2068 return FAIL;
2069 }
2070 }
2071 #endif /*DANE*/
2072
2073 /* Make the TCP connection */
2074
2075 sx->cctx.tls_ctx = NULL;
2076 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2077 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2078
2079 #ifdef EXPERIMENTAL_PIPE_CONNECT
2080 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2081 {
2082 sx->early_pipe_ok = TRUE;
2083 if ( read_ehlo_cache_entry(sx)
2084 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2085 {
2086 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2087 sx->early_pipe_active = TRUE;
2088 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2089 }
2090 }
2091
2092 if (sx->early_pipe_active)
2093 sx->outblock.conn_args = &sx->conn_args;
2094 else
2095 #endif
2096 {
2097 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2098 {
2099 uschar * msg = NULL;
2100 if (sx->verify)
2101 {
2102 msg = US strerror(errno);
2103 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2104 }
2105 set_errno_nohost(sx->addrlist,
2106 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2107 sx->verify ? string_sprintf("could not connect: %s", msg)
2108 : NULL,
2109 DEFER, FALSE);
2110 sx->send_quit = FALSE;
2111 return DEFER;
2112 }
2113 }
2114 /* Expand the greeting message while waiting for the initial response. (Makes
2115 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2116 delayed till here so that $sending_interface and $sending_port are set. */
2117 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2118 will be? Somehow I doubt it. */
2119
2120 if (sx->helo_data)
2121 if (!(sx->helo_data = expand_string(sx->helo_data)))
2122 if (sx->verify)
2123 log_write(0, LOG_MAIN|LOG_PANIC,
2124 "<%s>: failed to expand transport's helo_data value for callout: %s",
2125 sx->addrlist->address, expand_string_message);
2126
2127 #ifdef SUPPORT_I18N
2128 if (sx->helo_data)
2129 {
2130 expand_string_message = NULL;
2131 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2132 &expand_string_message)),
2133 expand_string_message)
2134 if (sx->verify)
2135 log_write(0, LOG_MAIN|LOG_PANIC,
2136 "<%s>: failed to expand transport's helo_data value for callout: %s",
2137 sx->addrlist->address, expand_string_message);
2138 else
2139 sx->helo_data = NULL;
2140 }
2141 #endif
2142
2143 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2144 is nevertheless a reasonably clean way of programming this kind of logic,
2145 where you want to escape on any error. */
2146
2147 if (!sx->smtps)
2148 {
2149 #ifdef EXPERIMENTAL_PIPE_CONNECT
2150 if (sx->early_pipe_active)
2151 {
2152 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2153 sx->outblock.cmd_count = 1;
2154 }
2155 else
2156 #endif
2157 {
2158 #ifdef TCP_QUICKACK
2159 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2160 sizeof(off));
2161 #endif
2162 if (!smtp_reap_banner(sx))
2163 goto RESPONSE_FAILED;
2164 }
2165
2166 #ifndef DISABLE_EVENT
2167 {
2168 uschar * s;
2169 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2170 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2171 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2172 if (s)
2173 {
2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2175 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2176 DEFER, FALSE);
2177 yield = DEFER;
2178 goto SEND_QUIT;
2179 }
2180 }
2181 #endif
2182
2183 /* Now check if the helo_data expansion went well, and sign off cleanly if
2184 it didn't. */
2185
2186 if (!sx->helo_data)
2187 {
2188 message = string_sprintf("failed to expand helo_data: %s",
2189 expand_string_message);
2190 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2191 yield = DEFER;
2192 goto SEND_QUIT;
2193 }
2194 }
2195
2196 /** Debugging without sending a message
2197 sx->addrlist->transport_return = DEFER;
2198 goto SEND_QUIT;
2199 **/
2200
2201 /* Errors that occur after this point follow an SMTP command, which is
2202 left in big_buffer by smtp_write_command() for use in error messages. */
2203
2204 smtp_command = big_buffer;
2205
2206 /* Tell the remote who we are...
2207
2208 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2209 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2210 greeting is of this form. The assumption was that the far end supports it
2211 properly... but experience shows that there are some that give 5xx responses,
2212 even though the banner includes "ESMTP" (there's a bloody-minded one that
2213 says "ESMTP not spoken here"). Cope with that case.
2214
2215 September 2000: Time has passed, and it seems reasonable now to always send
2216 EHLO at the start. It is also convenient to make the change while installing
2217 the TLS stuff.
2218
2219 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2220 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2221 would be no way to send out the mails, so there is now a host list
2222 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2223 PIPELINING problem as well. Maybe it can also be useful to cure other
2224 problems with broken servers.
2225
2226 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2227 Then somebody tried it with a Microsoft mailer... It seems that all other
2228 mailers use upper case for some reason (the RFC is quite clear about case
2229 independence) so, for peace of mind, I gave in. */
2230
2231 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2232
2233 /* Alas; be careful, since this goto is not an error-out, so conceivably
2234 we might set data between here and the target which we assume to exist
2235 and be usable. I can see this coming back to bite us. */
2236 #ifdef SUPPORT_TLS
2237 if (sx->smtps)
2238 {
2239 smtp_peer_options |= OPTION_TLS;
2240 suppress_tls = FALSE;
2241 ob->tls_tempfail_tryclear = FALSE;
2242 smtp_command = US"SSL-on-connect";
2243 goto TLS_NEGOTIATE;
2244 }
2245 #endif
2246
2247 if (sx->esmtp)
2248 {
2249 if (smtp_write_command(sx,
2250 #ifdef EXPERIMENTAL_PIPE_CONNECT
2251 sx->early_pipe_active ? SCMD_BUFFER :
2252 #endif
2253 SCMD_FLUSH,
2254 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2255 goto SEND_FAILED;
2256 sx->esmtp_sent = TRUE;
2257
2258 #ifdef EXPERIMENTAL_PIPE_CONNECT
2259 if (sx->early_pipe_active)
2260 {
2261 sx->pending_EHLO = TRUE;
2262
2263 /* If we have too many authenticators to handle and might need to AUTH
2264 for this transport, pipeline no further as we will need the
2265 list of auth methods offered. Reap the banner and EHLO. */
2266
2267 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2268 && f.smtp_in_early_pipe_no_auth)
2269 {
2270 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2271 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2272 goto SEND_FAILED;
2273 if (sync_responses(sx, 2, 0) != 0)
2274 {
2275 HDEBUG(D_transport)
2276 debug_printf("failed reaping pipelined cmd responses\n");
2277 goto RESPONSE_FAILED;
2278 }
2279 sx->early_pipe_active = FALSE;
2280 }
2281 }
2282 else
2283 #endif
2284 if (!smtp_reap_ehlo(sx))
2285 goto RESPONSE_FAILED;
2286 }
2287 else
2288 DEBUG(D_transport)
2289 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2290
2291 #ifdef EXPERIMENTAL_PIPE_CONNECT
2292 if (!sx->early_pipe_active)
2293 #endif
2294 if (!sx->esmtp)
2295 {
2296 BOOL good_response;
2297 int n = sizeof(sx->buffer);
2298 uschar * rsp = sx->buffer;
2299
2300 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2301 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2302
2303 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2304 goto SEND_FAILED;
2305 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2306 #ifdef EXPERIMENTAL_DSN_INFO
2307 sx->helo_response = string_copy(rsp);
2308 #endif
2309 if (!good_response)
2310 {
2311 /* Handle special logging for a closed connection after HELO
2312 when had previously sent EHLO */
2313
2314 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2315 {
2316 errno = ERRNO_SMTPCLOSED;
2317 goto EHLOHELO_FAILED;
2318 }
2319 memmove(sx->buffer, rsp, Ustrlen(rsp));
2320 goto RESPONSE_FAILED;
2321 }
2322 }
2323
2324 if (sx->esmtp || sx->lmtp)
2325 {
2326 #ifdef EXPERIMENTAL_PIPE_CONNECT
2327 if (!sx->early_pipe_active)
2328 #endif
2329 {
2330 sx->peer_offered = ehlo_response(sx->buffer,
2331 OPTION_TLS /* others checked later */
2332 #ifdef EXPERIMENTAL_PIPE_CONNECT
2333 | (sx->early_pipe_ok
2334 ? OPTION_IGNQ
2335 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2336 #ifdef SUPPORT_I18N
2337 | OPTION_UTF8
2338 #endif
2339 | OPTION_EARLY_PIPE
2340 : 0
2341 )
2342 #endif
2343 );
2344 #ifdef EXPERIMENTAL_PIPE_CONNECT
2345 if (sx->early_pipe_ok)
2346 {
2347 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2348
2349 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2350 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2351 {
2352 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2353 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2354 write_ehlo_cache_entry(sx);
2355 }
2356 }
2357 #endif
2358 }
2359
2360 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2361
2362 #ifdef SUPPORT_TLS
2363 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2364 #endif
2365 }
2366 }
2367
2368 /* For continuing deliveries down the same channel, having re-exec'd the socket
2369 is the standard input; for a socket held open from verify it is recorded
2370 in the cutthrough context block. Either way we don't need to redo EHLO here
2371 (but may need to do so for TLS - see below).
2372 Set up the pointer to where subsequent commands will be left, for
2373 error messages. Note that smtp_peer_options will have been
2374 set from the command line if they were set in the process that passed the
2375 connection on. */
2376
2377 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2378 as the continue goes via transport_pass_socket() and doublefork and exec.
2379 It does not wait. Unclear how we keep separate host's responses
2380 separate - we could match up by host ip+port as a bodge. */
2381
2382 else
2383 {
2384 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2385 {
2386 sx->cctx = cutthrough.cctx;
2387 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2388 }
2389 else
2390 {
2391 sx->cctx.sock = 0; /* stdin */
2392 sx->cctx.tls_ctx = NULL;
2393 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2394 }
2395 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2396 smtp_command = big_buffer;
2397 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2398
2399 /* For a continued connection with TLS being proxied for us, or a
2400 held-open verify connection with TLS, nothing more to do. */
2401
2402 if ( continue_proxy_cipher
2403 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2404 && cutthrough.is_tls)
2405 )
2406 {
2407 sx->peer_offered = smtp_peer_options;
2408 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2409 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2410 continue_proxy_cipher ? "proxied" : "verify conn with");
2411 return OK;
2412 }
2413 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2414 }
2415
2416 /* If TLS is available on this connection, whether continued or not, attempt to
2417 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2418 send another EHLO - the server may give a different answer in secure mode. We
2419 use a separate buffer for reading the response to STARTTLS so that if it is
2420 negative, the original EHLO data is available for subsequent analysis, should
2421 the client not be required to use TLS. If the response is bad, copy the buffer
2422 for error analysis. */
2423
2424 #ifdef SUPPORT_TLS
2425 if ( smtp_peer_options & OPTION_TLS
2426 && !suppress_tls
2427 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2428 && ( !sx->verify
2429 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2430 ) )
2431 {
2432 uschar buffer2[4096];
2433
2434 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2435 goto SEND_FAILED;
2436
2437 #ifdef EXPERIMENTAL_PIPE_CONNECT
2438 /* If doing early-pipelining reap the banner and EHLO-response but leave
2439 the response for the STARTTLS we just sent alone. */
2440
2441 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2442 {
2443 HDEBUG(D_transport)
2444 debug_printf("failed reaping pipelined cmd responses\n");
2445 goto RESPONSE_FAILED;
2446 }
2447 #endif
2448
2449 /* If there is an I/O error, transmission of this message is deferred. If
2450 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2451 false, we also defer. However, if there is a temporary rejection of STARTTLS
2452 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2453 STARTTLS, we carry on. This means we will try to send the message in clear,
2454 unless the host is in hosts_require_tls (tested below). */
2455
2456 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2457 {
2458 if ( errno != 0
2459 || buffer2[0] == 0
2460 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2461 )
2462 {
2463 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2464 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2465 goto RESPONSE_FAILED;
2466 }
2467 }
2468
2469 /* STARTTLS accepted: try to negotiate a TLS session. */
2470
2471 else
2472 TLS_NEGOTIATE:
2473 {
2474 uschar * errstr;
2475 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2476 sx->addrlist, sx->conn_args.tblock,
2477 # ifdef SUPPORT_DANE
2478 sx->dane ? &tlsa_dnsa : NULL,
2479 # endif
2480 &tls_out, &errstr);
2481
2482 if (!sx->cctx.tls_ctx)
2483 {
2484 /* TLS negotiation failed; give an error. From outside, this function may
2485 be called again to try in clear on a new connection, if the options permit
2486 it for this host. */
2487 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2488
2489 # ifdef SUPPORT_DANE
2490 if (sx->dane)
2491 {
2492 log_write(0, LOG_MAIN,
2493 "DANE attempt failed; TLS connection to %s [%s]: %s",
2494 sx->conn_args.host->name, sx->conn_args.host->address, errstr);
2495 # ifndef DISABLE_EVENT
2496 (void) event_raise(sx->conn_args.tblock->event_action,
2497 US"dane:fail", US"validation-failure"); /* could do with better detail */
2498 # endif
2499 }
2500 # endif
2501
2502 errno = ERRNO_TLSFAILURE;
2503 message = string_sprintf("TLS session: %s", errstr);
2504 sx->send_quit = FALSE;
2505 goto TLS_FAILED;
2506 }
2507
2508 /* TLS session is set up */
2509
2510 smtp_peer_options_wrap = smtp_peer_options;
2511 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2512 if (addr->transport_return == PENDING_DEFER)
2513 {
2514 addr->cipher = tls_out.cipher;
2515 addr->ourcert = tls_out.ourcert;
2516 addr->peercert = tls_out.peercert;
2517 addr->peerdn = tls_out.peerdn;
2518 addr->ocsp = tls_out.ocsp;
2519 }
2520 }
2521 }
2522
2523 /* if smtps, we'll have smtp_command set to something else; always safe to
2524 reset it here. */
2525 smtp_command = big_buffer;
2526
2527 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2528 helo_data is null, we are dealing with a connection that was passed from
2529 another process, and so we won't have expanded helo_data above. We have to
2530 expand it here. $sending_ip_address and $sending_port are set up right at the
2531 start of the Exim process (in exim.c). */
2532
2533 if (tls_out.active.sock >= 0)
2534 {
2535 uschar * greeting_cmd;
2536
2537 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2538 {
2539 uschar *message = string_sprintf("failed to expand helo_data: %s",
2540 expand_string_message);
2541 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2542 yield = DEFER;
2543 goto SEND_QUIT;
2544 }
2545
2546 #ifdef EXPERIMENTAL_PIPE_CONNECT
2547 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2548 We're unlikely to get the group sent and delivered before the server sends its
2549 banner, but it's still worth sending as a group.
2550 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2551 the reverse. */
2552
2553 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2554 {
2555 sx->peer_offered = sx->ehlo_resp.crypted_features;
2556 if ((sx->early_pipe_active =
2557 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2558 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2559 }
2560 #endif
2561
2562 /* For SMTPS we need to wait for the initial OK response. */
2563 if (sx->smtps)
2564 #ifdef EXPERIMENTAL_PIPE_CONNECT
2565 if (sx->early_pipe_active)
2566 {
2567 sx->pending_BANNER = TRUE;
2568 sx->outblock.cmd_count = 1;
2569 }
2570 else
2571 #endif
2572 if (!smtp_reap_banner(sx))
2573 goto RESPONSE_FAILED;
2574
2575 if (sx->lmtp)
2576 greeting_cmd = US"LHLO";
2577 else if (sx->esmtp)
2578 greeting_cmd = US"EHLO";
2579 else
2580 {
2581 greeting_cmd = US"HELO";
2582 DEBUG(D_transport)
2583 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2584 }
2585
2586 if (smtp_write_command(sx,
2587 #ifdef EXPERIMENTAL_PIPE_CONNECT
2588 sx->early_pipe_active ? SCMD_BUFFER :
2589 #endif
2590 SCMD_FLUSH,
2591 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2592 goto SEND_FAILED;
2593
2594 #ifdef EXPERIMENTAL_PIPE_CONNECT
2595 if (sx->early_pipe_active)
2596 sx->pending_EHLO = TRUE;
2597 else
2598 #endif
2599 {
2600 if (!smtp_reap_ehlo(sx))
2601 goto RESPONSE_FAILED;
2602 smtp_peer_options = 0;
2603 }
2604 }
2605
2606 /* If the host is required to use a secure channel, ensure that we
2607 have one. */
2608
2609 else if ( sx->smtps
2610 # ifdef SUPPORT_DANE
2611 || sx->dane
2612 # endif
2613 # ifdef EXPERIMENTAL_REQUIRETLS
2614 || tls_requiretls & REQUIRETLS_MSG
2615 # endif
2616 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2617 )
2618 {
2619 errno =
2620 # ifdef EXPERIMENTAL_REQUIRETLS
2621 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2622 # endif
2623 ERRNO_TLSREQUIRED;
2624 message = string_sprintf("a TLS session is required, but %s",
2625 smtp_peer_options & OPTION_TLS
2626 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2627 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2628 if (sx->dane)
2629 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2630 smtp_peer_options & OPTION_TLS
2631 ? US"validation-failure" /* could do with better detail */
2632 : US"starttls-not-supported");
2633 # endif
2634 goto TLS_FAILED;
2635 }
2636 #endif /*SUPPORT_TLS*/
2637
2638 /* If TLS is active, we have just started it up and re-done the EHLO command,
2639 so its response needs to be analyzed. If TLS is not active and this is a
2640 continued session down a previously-used socket, we haven't just done EHLO, so
2641 we skip this. */
2642
2643 if (continue_hostname == NULL
2644 #ifdef SUPPORT_TLS
2645 || tls_out.active.sock >= 0
2646 #endif
2647 )
2648 {
2649 if (sx->esmtp || sx->lmtp)
2650 {
2651 #ifdef EXPERIMENTAL_PIPE_CONNECT
2652 if (!sx->early_pipe_active)
2653 #endif
2654 {
2655 sx->peer_offered = ehlo_response(sx->buffer,
2656 0 /* no TLS */
2657 #ifdef EXPERIMENTAL_PIPE_CONNECT
2658 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2659 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2660 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2661 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2662
2663 #else
2664
2665 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2666 | OPTION_CHUNKING
2667 | OPTION_PRDR
2668 # ifdef SUPPORT_I18N
2669 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2670 /*XXX if we hand peercaps on to continued-conn processes,
2671 must not depend on this addr */
2672 # endif
2673 | OPTION_DSN
2674 | OPTION_PIPE
2675 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2676 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2677 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2678 # endif
2679 #endif
2680 );
2681 #ifdef EXPERIMENTAL_PIPE_CONNECT
2682 if (tls_out.active.sock >= 0)
2683 sx->ehlo_resp.crypted_features = sx->peer_offered;
2684 #endif
2685 }
2686
2687 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2688 lmtp_ignore_quota option was set. */
2689
2690 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2691
2692 /* If the response to EHLO specified support for the SIZE parameter, note
2693 this, provided size_addition is non-negative. */
2694
2695 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2696
2697 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2698 the current host, esmtp will be false, so PIPELINING can never be used. If
2699 the current host matches hosts_avoid_pipelining, don't do it. */
2700
2701 if ( sx->peer_offered & OPTION_PIPE
2702 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2703 smtp_peer_options |= OPTION_PIPE;
2704
2705 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2706 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2707
2708 if ( sx->peer_offered & OPTION_CHUNKING
2709 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2710 sx->peer_offered &= ~OPTION_CHUNKING;
2711
2712 if (sx->peer_offered & OPTION_CHUNKING)
2713 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2714
2715 #ifndef DISABLE_PRDR
2716 if ( sx->peer_offered & OPTION_PRDR
2717 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2718 sx->peer_offered &= ~OPTION_PRDR;
2719
2720 if (sx->peer_offered & OPTION_PRDR)
2721 DEBUG(D_transport) debug_printf("PRDR usable\n");
2722 #endif
2723
2724 /* Note if the server supports DSN */
2725 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2726 DEBUG(D_transport) debug_printf("%susing DSN\n",
2727 sx->peer_offered & OPTION_DSN ? "" : "not ");
2728
2729 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2730 if (sx->peer_offered & OPTION_REQUIRETLS)
2731 {
2732 smtp_peer_options |= OPTION_REQUIRETLS;
2733 DEBUG(D_transport) debug_printf(
2734 tls_requiretls & REQUIRETLS_MSG
2735 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2736 }
2737 #endif
2738
2739 #ifdef EXPERIMENTAL_PIPE_CONNECT
2740 if ( sx->early_pipe_ok
2741 && !sx->early_pipe_active
2742 && tls_out.active.sock >= 0
2743 && smtp_peer_options & OPTION_PIPE
2744 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2745 & OPTION_EARLY_PIPE)
2746 {
2747 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2748 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2749 write_ehlo_cache_entry(sx);
2750 }
2751 #endif
2752
2753 /* Note if the response to EHLO specifies support for the AUTH extension.
2754 If it has, check that this host is one we want to authenticate to, and do
2755 the business. The host name and address must be available when the
2756 authenticator's client driver is running. */
2757
2758 switch (yield = smtp_auth(sx))
2759 {
2760 default: goto SEND_QUIT;
2761 case OK: break;
2762 case FAIL_SEND: goto SEND_FAILED;
2763 case FAIL: goto RESPONSE_FAILED;
2764 }
2765 }
2766 }
2767 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2768
2769 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2770 message-specific. */
2771
2772 sx->setting_up = FALSE;
2773
2774 #ifdef SUPPORT_I18N
2775 if (sx->addrlist->prop.utf8_msg)
2776 {
2777 uschar * s;
2778
2779 /* If the transport sets a downconversion mode it overrides any set by ACL
2780 for the message. */
2781
2782 if ((s = ob->utf8_downconvert))
2783 {
2784 if (!(s = expand_string(s)))
2785 {
2786 message = string_sprintf("failed to expand utf8_downconvert: %s",
2787 expand_string_message);
2788 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2789 yield = DEFER;
2790 goto SEND_QUIT;
2791 }
2792 switch (*s)
2793 {
2794 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2795 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2796 break;
2797 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2798 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2799 break;
2800 case '-': if (s[1] == '1')
2801 {
2802 sx->addrlist->prop.utf8_downcvt = FALSE;
2803 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2804 }
2805 break;
2806 }
2807 }
2808
2809 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2810 && !sx->addrlist->prop.utf8_downcvt_maybe;
2811 DEBUG(D_transport) if (!sx->utf8_needed)
2812 debug_printf("utf8: %s downconvert\n",
2813 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2814 }
2815
2816 /* If this is an international message we need the host to speak SMTPUTF8 */
2817 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2818 {
2819 errno = ERRNO_UTF8_FWD;
2820 goto RESPONSE_FAILED;
2821 }
2822 #endif /*SUPPORT_I18N*/
2823
2824 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2825 /*XXX should tls_requiretls actually be per-addr? */
2826
2827 if ( tls_requiretls & REQUIRETLS_MSG
2828 && !(sx->peer_offered & OPTION_REQUIRETLS)
2829 )
2830 {
2831 sx->setting_up = TRUE;
2832 errno = ERRNO_REQUIRETLS;
2833 message = US"REQUIRETLS support is required from the server"
2834 " but it was not offered";
2835 DEBUG(D_transport) debug_printf("%s\n", message);
2836 goto TLS_FAILED;
2837 }
2838 #endif
2839
2840 return OK;
2841
2842
2843 {
2844 int code;
2845
2846 RESPONSE_FAILED:
2847 message = NULL;
2848 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2849 sx->buffer, &code, &message, &pass_message);
2850 yield = DEFER;
2851 goto FAILED;
2852
2853 SEND_FAILED:
2854 code = '4';
2855 message = US string_sprintf("send() to %s [%s] failed: %s",
2856 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2857 sx->send_quit = FALSE;
2858 yield = DEFER;
2859 goto FAILED;
2860
2861 EHLOHELO_FAILED:
2862 code = '4';
2863 message = string_sprintf("Remote host closed connection in response to %s"
2864 " (EHLO response was: %s)", smtp_command, sx->buffer);
2865 sx->send_quit = FALSE;
2866 yield = DEFER;
2867 goto FAILED;
2868
2869 /* This label is jumped to directly when a TLS negotiation has failed,
2870 or was not done for a host for which it is required. Values will be set
2871 in message and errno, and setting_up will always be true. Treat as
2872 a temporary error. */
2873
2874 #ifdef SUPPORT_TLS
2875 TLS_FAILED:
2876 # ifdef EXPERIMENTAL_REQUIRETLS
2877 if (errno == ERRNO_REQUIRETLS)
2878 code = '5', yield = FAIL;
2879 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2880 else
2881 # endif
2882 code = '4', yield = DEFER;
2883 goto FAILED;
2884 #endif
2885
2886 /* The failure happened while setting up the call; see if the failure was
2887 a 5xx response (this will either be on connection, or following HELO - a 5xx
2888 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2889 fail all addresses, as this host is never going to accept them. For other
2890 errors during setting up (timeouts or whatever), defer all addresses, and
2891 yield DEFER, so that the host is not tried again for a while.
2892
2893 XXX This peeking for another host feels like a layering violation. We want
2894 to note the host as unusable, but down here we shouldn't know if this was
2895 the last host to try for the addr(list). Perhaps the upper layer should be
2896 the one to do set_errno() ? The problem is that currently the addr is where
2897 errno etc. are stashed, but until we run out of hosts to try the errors are
2898 host-specific. Maybe we should enhance the host_item definition? */
2899
2900 FAILED:
2901 sx->ok = FALSE; /* For when reached by GOTO */
2902 set_errno(sx->addrlist, errno, message,
2903 sx->conn_args.host->next
2904 ? DEFER
2905 : code == '5'
2906 #ifdef SUPPORT_I18N
2907 || errno == ERRNO_UTF8_FWD
2908 #endif
2909 ? FAIL : DEFER,
2910 pass_message, sx->conn_args.host
2911 #ifdef EXPERIMENTAL_DSN_INFO
2912 , sx->smtp_greeting, sx->helo_response
2913 #endif
2914 );
2915 }
2916
2917
2918 SEND_QUIT:
2919
2920 if (sx->send_quit)
2921 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2922
2923 #ifdef SUPPORT_TLS
2924 if (sx->cctx.tls_ctx)
2925 {
2926 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2927 sx->cctx.tls_ctx = NULL;
2928 }
2929 #endif
2930
2931 /* Close the socket, and return the appropriate value, first setting
2932 works because the NULL setting is passed back to the calling process, and
2933 remote_max_parallel is forced to 1 when delivering over an existing connection,
2934 */
2935
2936 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2937 if (sx->send_quit)
2938 {
2939 shutdown(sx->cctx.sock, SHUT_WR);
2940 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2941 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2942 i--; /* drain socket */
2943 sx->send_quit = FALSE;
2944 }
2945 (void)close(sx->cctx.sock);
2946 sx->cctx.sock = -1;
2947
2948 #ifndef DISABLE_EVENT
2949 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2950 #endif
2951
2952 continue_transport = NULL;
2953 continue_hostname = NULL;
2954 return yield;
2955 }
2956
2957
2958
2959
2960 /* Create the string of options that will be appended to the MAIL FROM:
2961 in the connection context buffer */
2962
2963 static int
2964 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2965 {
2966 uschar * p = sx->buffer;
2967 address_item * addr;
2968 int address_count;
2969
2970 *p = 0;
2971
2972 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2973 send it, adding something to the message size to allow for imprecision
2974 and things that get added en route. Exim keeps the number of lines
2975 in a message, so we can give an accurate value for the original message, but we
2976 need some additional to handle added headers. (Double "." characters don't get
2977 included in the count.) */
2978
2979 if ( message_size > 0
2980 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2981 {
2982 /*XXX problem here under spool_files_wireformat?
2983 Or just forget about lines? Or inflate by a fixed proportion? */
2984
2985 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2986 while (*p) p++;
2987 }
2988
2989 #ifndef DISABLE_PRDR
2990 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2991 request that */
2992
2993 sx->prdr_active = FALSE;
2994 if (sx->peer_offered & OPTION_PRDR)
2995 for (address_item * addr = addrlist; addr; addr = addr->next)
2996 if (addr->transport_return == PENDING_DEFER)
2997 {
2998 for (addr = addr->next; addr; addr = addr->next)
2999 if (addr->transport_return == PENDING_DEFER)
3000 { /* at least two recipients to send */
3001 sx->prdr_active = TRUE;
3002 sprintf(CS p, " PRDR"); p += 5;
3003 break;
3004 }
3005 break;
3006 }
3007 #endif
3008
3009 #ifdef SUPPORT_I18N
3010 /* If it supports internationalised messages, and this meesage need that,
3011 request it */
3012
3013 if ( sx->peer_offered & OPTION_UTF8
3014 && addrlist->prop.utf8_msg
3015 && !addrlist->prop.utf8_downcvt
3016 )
3017 Ustrcpy(p, " SMTPUTF8"), p += 9;
3018 #endif
3019
3020 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3021 if (tls_requiretls & REQUIRETLS_MSG)
3022 Ustrcpy(p, " REQUIRETLS") , p += 11;
3023 #endif
3024
3025 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3026 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3027 addr && address_count < sx->max_rcpt;
3028 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3029 {
3030 address_count++;
3031 if (!(addr->dsn_flags & rf_dsnlasthop))
3032 {
3033 sx->dsn_all_lasthop = FALSE;
3034 break;
3035 }
3036 }
3037
3038 /* Add any DSN flags to the mail command */
3039
3040 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3041 {
3042 if (dsn_ret == dsn_ret_hdrs)
3043 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3044 else if (dsn_ret == dsn_ret_full)
3045 { Ustrcpy(p, " RET=FULL"); p += 9; }
3046
3047 if (dsn_envid)
3048 {
3049 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3050 while (*p) p++;
3051 }
3052 }
3053
3054 /* If an authenticated_sender override has been specified for this transport
3055 instance, expand it. If the expansion is forced to fail, and there was already
3056 an authenticated_sender for this message, the original value will be used.
3057 Other expansion failures are serious. An empty result is ignored, but there is
3058 otherwise no check - this feature is expected to be used with LMTP and other
3059 cases where non-standard addresses (e.g. without domains) might be required. */
3060
3061 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3062 return ERROR;
3063
3064 return OK;
3065 }
3066
3067
3068 static void
3069 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3070 {
3071 uschar * p = sx->buffer;
3072 *p = 0;
3073
3074 /* Add any DSN flags to the rcpt command */
3075
3076 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3077 {
3078 if (addr->dsn_flags & rf_dsnflags)
3079 {
3080 BOOL first = TRUE;
3081
3082 Ustrcpy(p, " NOTIFY=");
3083 while (*p) p++;
3084 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3085 {
3086 if (!first) *p++ = ',';
3087 first = FALSE;
3088 Ustrcpy(p, rf_names[i]);
3089 while (*p) p++;
3090 }
3091 }
3092
3093 if (addr->dsn_orcpt)
3094 {
3095 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3096 addr->dsn_orcpt);
3097 while (*p) p++;
3098 }
3099 }
3100 }
3101
3102
3103
3104 /*
3105 Return:
3106 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3107 -1 MAIL response error
3108 -2 any non-MAIL read i/o error
3109 -3 non-MAIL response timeout
3110 -4 internal error; channel still usable
3111 -5 transmit failed
3112 */
3113
3114 int
3115 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3116 {
3117 address_item * addr;
3118 int address_count;
3119 int rc;
3120
3121 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3122 {
3123 *yield = ERROR;
3124 return -4;
3125 }
3126
3127 /* From here until we send the DATA command, we can make use of PIPELINING
3128 if the server host supports it. The code has to be able to check the responses
3129 at any point, for when the buffer fills up, so we write it totally generally.
3130 When PIPELINING is off, each command written reports that it has flushed the
3131 buffer. */
3132
3133 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3134
3135 {
3136 uschar * s = sx->from_addr;
3137 #ifdef SUPPORT_I18N
3138 uschar * errstr = NULL;
3139
3140 /* If we must downconvert, do the from-address here. Remember we had to
3141 for the to-addresses (done below), and also (ugly) for re-doing when building
3142 the delivery log line. */
3143
3144 if ( sx->addrlist->prop.utf8_msg
3145 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3146 )
3147 {
3148 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3149 {
3150 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3151 *yield = ERROR;
3152 return -4;
3153 }
3154 setflag(sx->addrlist, af_utf8_downcvt);
3155 }
3156 #endif
3157
3158 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3159 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3160 }
3161
3162 mail_command = string_copy(big_buffer); /* Save for later error message */
3163
3164 switch(rc)
3165 {
3166 case -1: /* Transmission error */
3167 return -5;
3168
3169 case +1: /* Cmd was sent */
3170 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3171 (SOB sx->conn_args.ob)->command_timeout))
3172 {
3173 if (errno == 0 && sx->buffer[0] == '4')
3174 {
3175 errno = ERRNO_MAIL4XX;
3176 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3177 }
3178 return -1;
3179 }
3180 sx->pending_MAIL = FALSE;
3181 break;
3182
3183 /* otherwise zero: command queued for pipeline */
3184 }
3185
3186 /* Pass over all the relevant recipient addresses for this host, which are the
3187 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3188 several before we have to read the responses for those seen so far. This
3189 checking is done by a subroutine because it also needs to be done at the end.
3190 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3191 the next one if not all are sent.
3192
3193 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3194 last address because we want to abort if any recipients have any kind of
3195 problem, temporary or permanent. We know that all recipient addresses will have
3196 the PENDING_DEFER status, because only one attempt is ever made, and we know
3197 that max_rcpt will be large, so all addresses will be done at once.
3198
3199 For verify we flush the pipeline after any (the only) rcpt address. */
3200
3201 for (addr = sx->first_addr, address_count = 0;
3202 addr && address_count < sx->max_rcpt;
3203 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3204 {
3205 int count;
3206 BOOL no_flush;
3207 uschar * rcpt_addr;
3208
3209 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3210 ? dsn_support_yes : dsn_support_no;
3211
3212 address_count++;
3213 no_flush = pipelining_active && !sx->verify
3214 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3215
3216 build_rcptcmd_options(sx, addr);
3217
3218 /* Now send the RCPT command, and process outstanding responses when
3219 necessary. After a timeout on RCPT, we just end the function, leaving the
3220 yield as OK, because this error can often mean that there is a problem with
3221 just one address, so we don't want to delay the host. */
3222
3223 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3224
3225 #ifdef SUPPORT_I18N
3226 if ( testflag(sx->addrlist, af_utf8_downcvt)
3227 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3228 )
3229 {
3230 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3231 errno = ERRNO_EXPANDFAIL;
3232 return -5; /*XXX too harsh? */
3233 }
3234 #endif
3235
3236 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3237 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3238
3239 if (count < 0) return -5;
3240 if (count > 0)
3241 {
3242 switch(sync_responses(sx, count, 0))
3243 {
3244 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3245 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3246 break;
3247
3248 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3249 if (!sx->lmtp) /* can't tell about progress yet */
3250 sx->completed_addr = TRUE;
3251 case 0: /* No 2xx or 5xx, but no probs */
3252 break;
3253
3254 case -1: return -3; /* Timeout on RCPT */
3255 case -2: return -2; /* non-MAIL read i/o error */
3256 default: return -1; /* any MAIL error */
3257
3258 #ifdef EXPERIMENTAL_PIPE_CONNECT
3259 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3260 #endif
3261 }
3262 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3263 }
3264 } /* Loop for next address */
3265
3266 sx->next_addr = addr;
3267 return 0;
3268 }
3269
3270
3271 #ifdef SUPPORT_TLS
3272 /*****************************************************
3273 * Proxy TLS connection for another transport process *
3274 ******************************************************/
3275 /*
3276 Close the unused end of the pipe, fork once more, then use the given buffer
3277 as a staging area, and select on both the given fd and the TLS'd client-fd for
3278 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3279 Do blocking full-size writes, and reads under a timeout. Once both input
3280 channels are closed, exit the process.
3281
3282 Arguments:
3283 ct_ctx tls context
3284 buf space to use for buffering
3285 bufsiz size of buffer
3286 pfd pipe filedescriptor array; [0] is comms to proxied process
3287 timeout per-read timeout, seconds
3288 */
3289
3290 void
3291 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3292 int timeout)
3293 {
3294 fd_set rfds, efds;
3295 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3296 int rc, i;
3297
3298 close(pfd[1]);
3299 if ((rc = fork()))
3300 {
3301 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3302 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3303 }
3304
3305 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3306 set_process_info("proxying TLS connection for continued transport");
3307 FD_ZERO(&rfds);
3308 FD_SET(tls_out.active.sock, &rfds);
3309 FD_SET(pfd[0], &rfds);
3310
3311 for (int fd_bits = 3; fd_bits; )
3312 {
3313 time_t time_left = timeout;
3314 time_t time_start = time(NULL);
3315
3316 /* wait for data */
3317 efds = rfds;
3318 do
3319 {
3320 struct timeval tv = { time_left, 0 };
3321
3322 rc = select(max_fd,
3323 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3324
3325 if (rc < 0 && errno == EINTR)
3326 if ((time_left -= time(NULL) - time_start) > 0) continue;
3327
3328 if (rc <= 0)
3329 {
3330 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3331 goto done;
3332 }
3333
3334 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3335 {
3336 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3337 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3338 goto done;
3339 }
3340 }
3341 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3342
3343 /* handle inbound data */
3344 if (FD_ISSET(tls_out.active.sock, &rfds))
3345 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3346 {
3347 fd_bits &= ~1;
3348 FD_CLR(tls_out.active.sock, &rfds);
3349 shutdown(pfd[0], SHUT_WR);
3350 timeout = 5;
3351 }
3352 else
3353 {
3354 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3355 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3356 }
3357 else if (fd_bits & 1)
3358 FD_SET(tls_out.active.sock, &rfds);
3359
3360 /* handle outbound data */
3361 if (FD_ISSET(pfd[0], &rfds))
3362 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3363 {
3364 fd_bits = 0;
3365 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3366 ct_ctx = NULL;
3367 }
3368 else
3369 {
3370 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3371 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3372 goto done;
3373 }
3374 else if (fd_bits & 2)
3375 FD_SET(pfd[0], &rfds);
3376 }
3377
3378 done:
3379 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3380 exim_exit(0, US"TLS proxy");
3381 }
3382 #endif
3383
3384
3385 /*************************************************
3386 * Deliver address list to given host *
3387 *************************************************/
3388
3389 /* If continue_hostname is not null, we get here only when continuing to
3390 deliver down an existing channel. The channel was passed as the standard
3391 input. TLS is never active on a passed channel; the previous process always
3392 closes it down before passing the connection on.
3393
3394 Otherwise, we have to make a connection to the remote host, and do the
3395 initial protocol exchange.
3396
3397 When running as an MUA wrapper, if the sender or any recipient is rejected,
3398 temporarily or permanently, we force failure for all recipients.
3399
3400 Arguments:
3401 addrlist chain of potential addresses to deliver; only those whose
3402 transport_return field is set to PENDING_DEFER are currently
3403 being processed; others should be skipped - they have either
3404 been delivered to an earlier host or IP address, or been
3405 failed by one of them.
3406 host host to deliver to
3407 host_af AF_INET or AF_INET6
3408 defport default TCP/IP port to use if host does not specify, in host
3409 byte order
3410 interface interface to bind to, or NULL
3411 tblock transport instance block
3412 message_defer set TRUE if yield is OK, but all addresses were deferred
3413 because of a non-recipient, non-host failure, that is, a
3414 4xx response to MAIL FROM, DATA, or ".". This is a defer
3415 that is specific to the message.
3416 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3417 a second attempt after TLS initialization fails
3418
3419 Returns: OK - the connection was made and the delivery attempted;
3420 the result for each address is in its data block.
3421 DEFER - the connection could not be made, or something failed
3422 while setting up the SMTP session, or there was a
3423 non-message-specific error, such as a timeout.
3424 ERROR - a filter command is specified for this transport,
3425 and there was a problem setting it up; OR helo_data
3426 or add_headers or authenticated_sender is specified
3427 for this transport, and the string failed to expand
3428 */
3429
3430 static int
3431 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3432 uschar *interface, transport_instance *tblock,
3433 BOOL *message_defer, BOOL suppress_tls)
3434 {
3435 smtp_transport_options_block * ob = SOB tblock->options_block;
3436 int yield = OK;
3437 int save_errno;
3438 int rc;
3439 struct timeval start_delivery_time;
3440
3441 BOOL pass_message = FALSE;
3442 uschar *message = NULL;
3443 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3444
3445 smtp_context sx;
3446
3447 gettimeofday(&start_delivery_time, NULL);
3448 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3449 *message_defer = FALSE;
3450
3451 sx.addrlist = addrlist;
3452 sx.conn_args.host = host;
3453 sx.conn_args.host_af = host_af,
3454 sx.port = defport;
3455 sx.conn_args.interface = interface;
3456 sx.helo_data = NULL;
3457 sx.conn_args.tblock = tblock;
3458 sx.verify = FALSE;
3459 sx.sync_addr = sx.first_addr = addrlist;
3460
3461 /* Get the channel set up ready for a message (MAIL FROM being the next
3462 SMTP command to send */
3463
3464 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3465 return rc;
3466
3467 /* If there is a filter command specified for this transport, we can now
3468 set it up. This cannot be done until the identify of the host is known. */
3469
3470 if (tblock->filter_command)
3471 {
3472 transport_filter_timeout = tblock->filter_timeout;
3473
3474 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3475 yield ERROR. */
3476
3477 if (!transport_set_up_command(&transport_filter_argv,
3478 tblock->filter_command, TRUE, DEFER, addrlist,
3479 string_sprintf("%.50s transport", tblock->name), NULL))
3480 {
3481 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3482 FALSE);
3483 yield = ERROR;
3484 goto SEND_QUIT;
3485 }
3486
3487 if ( transport_filter_argv
3488 && *transport_filter_argv
3489 && **transport_filter_argv
3490 && sx.peer_offered & OPTION_CHUNKING
3491 )
3492 {
3493 sx.peer_offered &= ~OPTION_CHUNKING;
3494 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3495 }
3496 }
3497
3498 /* For messages that have more than the maximum number of envelope recipients,
3499 we want to send several transactions down the same SMTP connection. (See
3500 comments in deliver.c as to how this reconciles, heuristically, with
3501 remote_max_parallel.) This optimization was added to Exim after the following
3502 code was already working. The simplest way to put it in without disturbing the
3503 code was to use a goto to jump back to this point when there is another
3504 transaction to handle. */
3505
3506 SEND_MESSAGE:
3507 sx.from_addr = return_path;
3508 sx.sync_addr = sx.first_addr;
3509 sx.ok = FALSE;
3510 sx.send_rset = TRUE;
3511 sx.completed_addr = FALSE;
3512
3513
3514 /* If we are a continued-connection-after-verify the MAIL and RCPT
3515 commands were already sent; do not re-send but do mark the addrs as
3516 having been accepted up to RCPT stage. A traditional cont-conn
3517 always has a sequence number greater than one. */
3518
3519 if (continue_hostname && continue_sequence == 1)
3520 {
3521 sx.peer_offered = smtp_peer_options;
3522 sx.pending_MAIL = FALSE;
3523 sx.ok = TRUE;
3524 sx.next_addr = NULL;
3525
3526 for (address_item * addr = addrlist; addr; addr = addr->next)
3527 addr->transport_return = PENDING_OK;
3528 }
3529 else
3530 {
3531 /* Initiate a message transfer. */
3532
3533 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3534 {
3535 case 0: break;
3536 case -1: case -2: goto RESPONSE_FAILED;
3537 case -3: goto END_OFF;
3538 case -4: goto SEND_QUIT;
3539 default: goto SEND_FAILED;
3540 }
3541
3542 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3543 permanently or temporarily. We should have flushed and synced after the last
3544 RCPT. */
3545
3546 if (mua_wrapper)
3547 {
3548 address_item * a;
3549 unsigned cnt;
3550
3551 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3552 if (a->transport_return != PENDING_OK)
3553 {
3554 /*XXX could we find a better errno than 0 here? */
3555 set_errno_nohost(addrlist, 0, a->message, FAIL,
3556 testflag(a, af_pass_message));
3557 sx.ok = FALSE;
3558 break;
3559 }
3560 }
3561 }
3562
3563 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3564 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3565 have a good recipient buffered up if we are pipelining. We don't want to waste
3566 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3567 are pipelining. The responses are all handled by sync_responses().
3568 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3569 to send is. */
3570
3571 if ( !(sx.peer_offered & OPTION_CHUNKING)
3572 && (sx.ok || (pipelining_active && !mua_wrapper)))
3573 {
3574 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3575
3576 if (count < 0) goto SEND_FAILED;
3577 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3578 {
3579 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3580 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3581 break;
3582
3583 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3584 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3585 case 0: break; /* No 2xx or 5xx, but no probs */
3586
3587 case -1: goto END_OFF; /* Timeout on RCPT */
3588
3589 #ifdef EXPERIMENTAL_PIPE_CONNECT
3590 case -4: HDEBUG(D_transport)
3591 debug_printf("failed reaping pipelined cmd responses\n");
3592 #endif
3593 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3594 }
3595 pipelining_active = FALSE;
3596 data_command = string_copy(big_buffer); /* Save for later error message */
3597 }
3598
3599 /* If there were no good recipients (but otherwise there have been no
3600 problems), just set ok TRUE, since we have handled address-specific errors
3601 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3602 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3603 well as body. Set the appropriate timeout value to be used for each chunk.
3604 (Haven't been able to make it work using select() for writing yet.) */
3605
3606 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3607 {
3608 /* Save the first address of the next batch. */
3609 sx.first_addr = sx.next_addr;
3610
3611 sx.ok = TRUE;
3612 }
3613 else
3614 {
3615 transport_ctx tctx = {
3616 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3617 .tblock = tblock,
3618 .addr = addrlist,
3619 .check_string = US".",
3620 .escape_string = US"..", /* Escaping strings */
3621 .options =
3622 topt_use_crlf | topt_escape_headers
3623 | (tblock->body_only ? topt_no_headers : 0)
3624 | (tblock->headers_only ? topt_no_body : 0)
3625 | (tblock->return_path_add ? topt_add_return_path : 0)
3626 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3627 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3628 };
3629
3630 /* If using CHUNKING we need a callback from the generic transport
3631 support to us, for the sending of BDAT smtp commands and the reaping
3632 of responses. The callback needs a whole bunch of state so set up
3633 a transport-context structure to be passed around. */
3634
3635 if (sx.peer_offered & OPTION_CHUNKING)
3636 {
3637 tctx.check_string = tctx.escape_string = NULL;
3638 tctx.options |= topt_use_bdat;
3639 tctx.chunk_cb = smtp_chunk_cmd_callback;
3640 sx.pending_BDAT = FALSE;
3641 sx.good_RCPT = sx.ok;
3642 sx.cmd_count = 0;
3643 tctx.smtp_context = &sx;
3644 }
3645 else
3646 tctx.options |= topt_end_dot;
3647
3648 /* Save the first address of the next batch. */
3649 sx.first_addr = sx.next_addr;
3650
3651 /* Responses from CHUNKING commands go in buffer. Otherwise,
3652 there has not been a response. */
3653
3654 sx.buffer[0] = 0;
3655
3656 sigalrm_seen = FALSE;
3657 transport_write_timeout = ob->data_timeout;
3658 smtp_command = US"sending data block"; /* For error messages */
3659 DEBUG(D_transport|D_v)
3660 if (sx.peer_offered & OPTION_CHUNKING)
3661 debug_printf(" will write message using CHUNKING\n");
3662 else
3663 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3664 transport_count = 0;
3665
3666 #ifndef DISABLE_DKIM
3667 dkim_exim_sign_init();
3668 # ifdef EXPERIMENTAL_ARC
3669 {
3670 uschar * s = ob->arc_sign;
3671 if (s)
3672 {
3673 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3674 {
3675 if (!f.expand_string_forcedfail)
3676 {
3677 message = US"failed to expand arc_sign";
3678 sx.ok = FALSE;
3679 goto SEND_FAILED;
3680 }
3681 }
3682 else if (*s)
3683 {
3684 /* Ask dkim code to hash the body for ARC */
3685 (void) arc_ams_setup_sign_bodyhash();
3686 ob->dkim.force_bodyhash = TRUE;
3687 }
3688 }
3689 }
3690 # endif
3691 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3692 #else
3693 sx.ok = transport_write_message(&tctx, 0);
3694 #endif
3695
3696 /* transport_write_message() uses write() because it is called from other
3697 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3698 it can exit with "Broken pipe" as its error. This really means that the
3699 socket got closed at the far end. */
3700
3701 transport_write_timeout = 0; /* for subsequent transports */
3702
3703 /* Failure can either be some kind of I/O disaster (including timeout),
3704 or the failure of a transport filter or the expansion of added headers.
3705 Or, when CHUNKING, it can be a protocol-detected failure. */
3706
3707 if (!sx.ok)
3708 if (message) goto SEND_FAILED;
3709 else goto RESPONSE_FAILED;
3710
3711 /* We used to send the terminating "." explicitly here, but because of
3712 buffering effects at both ends of TCP/IP connections, you don't gain
3713 anything by keeping it separate, so it might as well go in the final
3714 data buffer for efficiency. This is now done by setting the topt_end_dot
3715 flag above. */
3716
3717 smtp_command = US"end of data";
3718
3719 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3720 {
3721 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3722 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3723 {
3724 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3725 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3726 break;
3727
3728 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3729 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3730 case 0: break; /* No 2xx or 5xx, but no probs */
3731
3732 case -1: goto END_OFF; /* Timeout on RCPT */
3733
3734 #ifdef EXPERIMENTAL_PIPE_CONNECT
3735 case -4: HDEBUG(D_transport)
3736 debug_printf("failed reaping pipelined cmd responses\n");
3737 #endif
3738 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3739 }
3740 }
3741
3742 #ifndef DISABLE_PRDR
3743 /* For PRDR we optionally get a partial-responses warning followed by the
3744 individual responses, before going on with the overall response. If we don't
3745 get the warning then deal with per non-PRDR. */
3746
3747 if(sx.prdr_active)
3748 {
3749 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3750 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3751 {
3752 case '2': sx.prdr_active = FALSE;
3753 sx.ok = TRUE;
3754 break;
3755 case '4': errno = ERRNO_DATA4XX;
3756 addrlist->more_errno |=
3757 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3758 break;
3759 }
3760 }
3761 else
3762 #endif
3763
3764 /* For non-PRDR SMTP, we now read a single response that applies to the
3765 whole message. If it is OK, then all the addresses have been delivered. */
3766
3767 if (!sx.lmtp)
3768 {
3769 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3770 ob->final_timeout);
3771 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3772 {
3773 errno = ERRNO_DATA4XX;
3774 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3775 }
3776 }
3777
3778 /* For LMTP, we get back a response for every RCPT command that we sent;
3779 some may be accepted and some rejected. For those that get a response, their
3780 status is fixed; any that are accepted have been handed over, even if later
3781 responses crash - at least, that's how I read RFC 2033.
3782
3783 If all went well, mark the recipient addresses as completed, record which
3784 host/IPaddress they were delivered to, and cut out RSET when sending another
3785 message down the same channel. Write the completed addresses to the journal
3786 now so that they are recorded in case there is a crash of hardware or
3787 software before the spool gets updated. Also record the final SMTP
3788 confirmation if needed (for SMTP only). */
3789
3790 if (sx.ok)
3791 {
3792 int flag = '=';
3793 struct timeval delivery_time;
3794 int len;
3795 uschar * conf = NULL;
3796
3797 timesince(&delivery_time, &start_delivery_time);
3798 sx.send_rset = FALSE;
3799 pipelining_active = FALSE;
3800
3801 /* Set up confirmation if needed - applies only to SMTP */
3802
3803 if (
3804 #ifdef DISABLE_EVENT
3805 LOGGING(smtp_confirmation) &&
3806 #endif
3807 !sx.lmtp
3808 )
3809 {